{"id":2696,"date":"2026-09-10T06:34:55","date_gmt":"2026-09-10T06:34:55","guid":{"rendered":"https:\/\/www.cybernetik.com\/blog\/?p=2696"},"modified":"2026-09-10T06:36:34","modified_gmt":"2026-09-10T06:36:34","slug":"laser-welding-vs-wire-bonding-cell-interconnects-in","status":"publish","type":"post","link":"https:\/\/www.cybernetik.com\/blog\/cleantech\/laser-welding-vs-wire-bonding-cell-interconnects-in\/","title":{"rendered":"Laser Welding vs Wire Bonding for Cell Interconnects"},"content":{"rendered":"\n<div class=\"wp-block-group has-white-color has-text-color has-background has-link-color wp-elements-24304ed6195dbc3f43117102106f6e80 is-layout-constrained wp-container-core-group-is-layout-800b4e77 wp-block-group-is-layout-constrained\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px;background-color:#12263a;margin-bottom:20px;padding-top:10px;padding-right:30px;padding-bottom:30px;padding-left:30px\">\n<h2 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-19215f1e6a1396f83f0257af42631315\" style=\"line-height:1.4\">Key takeaways<\/h2>\n\n\n\n<div style=\"height:6px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_a62cca-95:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_a62cca-95 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_a62cca-95 ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_a62cca-95 .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_a62cca-95 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items2696_a62cca-95 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items2696_a62cca-95 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items2696_a62cca-95 ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items2696_a62cca-95 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-2696_f4fdd9-8d .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_f4fdd9-8d\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Laser welding, wire bonding, and resistance welding each offer different trade-offs in heat input, current capacity, fault behavior, fit-up tolerance, and cell-format compatibility.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_d5eaf2-e5 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_d5eaf2-e5\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Laser welding provides fast, high-current connections without consumables, but requires tight fit-up and careful control of heat, copper absorption, and dissimilar-metal interfaces.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_03ad19-b6 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_03ad19-b6\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Wire bonding produces very low heat because it is a solid-state process, while the bond wire can act as a deliberate fusible link that isolates a failed cell under fault conditions.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_764461-2d .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_764461-2d\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Resistance welding remains a simple and cost-effective option for smaller cylindrical packs, although it introduces more heat into the cell and has lower current capacity than laser welding.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_4899f2-ae .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_4899f2-ae\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">The joining method should be selected based on cell format, fault-protection strategy, heat sensitivity, joint count, and production rate, with laser welding generally suited to large-format cells and wire bonding to high-count cylindrical packs.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_096aa8-1a .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_096aa8-1a\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Production quality depends on method-specific verification, including inline resistance, vision, and depth checks for laser welds and process monitoring with sampled pull testing for wire bonds, supported by surface preparation and traceability.<\/span><\/li>\n<\/ul><\/div>\n<\/div>\n\n\n\n<p class=\"has-link-color wp-elements-55efe3e248d27a7368c8fccb2002206d wp-block-paragraph\">Every cell in a battery pack has to be joined electrically to its neighbors, and in a pack containing several hundred cylindrical cells that means thousands of individual connections. Each one carries current, holds mechanically for a decade of vibration, and cannot be inspected once the module is built.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two joining methods dominate, with a third still widely used at smaller scale. They are not interchangeable, and the choice is driven less by cost than by heat, by whether the joint should fail safely, and by what cell format the pack uses.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This article covers how each method works, what it does well, and how the decision is actually made.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What the Joint Has to Do<\/strong><\/h2>\n\n\n\n<p class=\"has-link-color wp-elements-db68b06ab19c937b9371d51fd109d645 wp-block-paragraph\">The interconnect is a small feature with several simultaneous requirements, and understanding them explains why the methods differ.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_73ff8a-fd:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_73ff8a-fd ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_73ff8a-fd ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_73ff8a-fd .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_73ff8a-fd ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items2696_73ff8a-fd ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items2696_73ff8a-fd ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items2696_73ff8a-fd ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items2696_73ff8a-fd kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-2696_3233ff-9a .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_3233ff-9a\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Carry current with minimal resistance. <\/strong>Resistance at the joint generates heat and wastes energy, and a joint that is marginally resistive when new degrades faster than the rest of the pack.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_f0b3cf-a5 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_f0b3cf-a5\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Hold mechanically. <\/strong>The joint experiences vibration and thermal cycling for the service life of the pack, so a connection that is electrically adequate but mechanically weak fails eventually.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_43b9a9-a0 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_43b9a9-a0\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Not damage the cell. <\/strong>The terminal is millimeters from separator and electrolyte, and heat conducted into the cell during joining can degrade both without leaving any visible sign.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_415e5b-b5 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_415e5b-b5\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Behave predictably under fault. <\/strong>If a cell shorts internally, its neighbors will attempt to discharge into it. What the interconnect does at that moment is a safety characteristic rather than an electrical one.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">That last requirement is where the two main methods genuinely diverge, and it is often the deciding factor.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Laser Welding<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A focused laser beam melts the busbar and cell terminal material together, forming a fused joint. It is fast, needs no consumable, adds no material, and can produce a large conductive cross-section, which makes it the standard choice where high current must pass through a single connection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Weld modes<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Two regimes matter. Conduction mode produces a shallow, wide weld where heat spreads from the surface, and it is more stable and cleaner. Keyhole mode uses higher energy density to open a vapor channel, producing a deep narrow weld with far greater penetration, at the cost of a greater tendency toward porosity and spatter. Cell interconnects generally want penetration sufficient to carry current without reaching further into the cell than necessary, so parameter control sits between the two.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The copper problem<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Copper is the natural busbar material and a difficult one to weld with conventional infrared lasers, because it reflects the great majority of that wavelength at room temperature. The result is unstable coupling: very little energy enters until the surface heats, at which point absorption rises sharply and the process can run away, producing spatter and inconsistent penetration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two responses are established. Green and blue wavelength lasers are absorbed far more readily by copper, giving stable coupling from the start and much more consistent welds. And beam oscillation, moving the focal spot in a small pattern as it travels, stabilizes the melt pool, widens the weld and reduces spatter with conventional sources.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Dissimilar metals<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Cell terminals and busbars are frequently different materials: aluminum on one side, copper or nickel-plated steel on the other. Welding aluminum to copper forms brittle intermetallic phases at the interface, and the more heat and time applied, the thicker and more brittle that layer becomes. Managing it means limiting heat input, controlling the melt geometry, or introducing an interlayer such as nickel so the two metals never meet directly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Fit-up<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Laser welding is unforgiving of gaps. The process assumes intimate contact between the parts being joined, and a variable gap produces variable penetration and, in the worst case, no joint at all. That places real demands on component tolerance and on the fixturing that holds cells and busbars during welding, which is a cost that appears in the tooling rather than the laser.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full has-custom-border\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1920\" height=\"1281\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/What-Cell-to-Pack-Gains.webp\" alt=\"\" class=\"wp-image-2641\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px\" srcset=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/What-Cell-to-Pack-Gains.webp 1920w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/What-Cell-to-Pack-Gains-300x200.webp 300w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/What-Cell-to-Pack-Gains-1024x683.webp 1024w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/What-Cell-to-Pack-Gains-768x512.webp 768w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/09\/What-Cell-to-Pack-Gains-1536x1025.webp 1536w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Wire Bonding<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Heavy wire bonding joins an aluminum wire to the cell terminal and to the busbar using ultrasonic energy and force. There is no melting: the ultrasonic scrubbing action disrupts surface oxides and creates a solid-state bond between the two metals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two consequences follow from that mechanism, and both are significant.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Very low heat into the cell<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Because nothing melts, the thermal load on the cell is minimal compared with any fusion process. For cells where terminal heating is a genuine concern, this is a substantial advantage, and it is why wire bonding is favored in applications where the cell chemistry or construction is heat sensitive.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The fusible link<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A bond wire has a small cross-section relative to the current a shorted cell can draw. Under fault conditions it heats and melts, disconnecting that cell from the pack. This is not a side effect but a deliberate design property: the interconnect acts as a fuse, isolating a failed cell rather than allowing its neighbors to dump energy into it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In a pack containing hundreds of cylindrical cells, that behavior meaningfully changes the failure mode. A single cell failure becomes a small loss of capacity rather than a propagating event. No fusion-welded joint provides this, which is why wire bonding retains a strong position in high-cell-count packs despite being slower per unit of current carried.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Tolerance and consumables<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Wire bonding is far more forgiving of surface variation and gap than laser welding, because the wire spans between two points rather than requiring them to touch. Against that, it consumes wire and wears bonding tools, and each joint carries limited current, so capacity is built by placing several wires per cell.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Resistance Welding<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The third method passes current through electrodes to heat and fuse a nickel strip to the cell terminal. It is mechanically simple, inexpensive and long established, particularly in smaller cylindrical packs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its limitations are heat and capacity. Resistance welding puts more heat into the cell than either alternative, and the current a nickel strip can carry constrains it to lower-power applications. It remains a sound choice where those constraints are acceptable and the cost advantage matters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Comparison<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Criterion<\/strong><\/th><th><strong>Laser welding<\/strong><\/th><th><strong>Wire bonding<\/strong><\/th><th><strong>Resistance welding<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Heat into the cell<\/td><td>Low but real; controlled by parameters<\/td><td>Very low; a solid-state process with no melting<\/td><td>Highest of the three<\/td><\/tr><tr><td>Speed per joint<\/td><td>Fastest<\/td><td>Fast, but several wires per cell are often needed<\/td><td>Fast<\/td><\/tr><tr><td>Current capacity per joint<\/td><td>High, set by weld cross-section<\/td><td>Limited per wire; capacity built by adding wires<\/td><td>Moderate, limited by strip section<\/td><\/tr><tr><td>Fusible behavior<\/td><td>None; the joint is as strong as the busbar<\/td><td>Inherent; the wire acts as a fuse under fault current<\/td><td>None<\/td><\/tr><tr><td>Fit-up tolerance<\/td><td>Demanding; gaps must be tightly controlled<\/td><td>Forgiving of surface and gap variation<\/td><td>Moderate<\/td><\/tr><tr><td>Consumables<\/td><td>None<\/td><td>Wire and wedge tooling<\/td><td>Electrode tips<\/td><\/tr><tr><td>Non-destructive verification<\/td><td>Good options, including inline resistance and optical methods<\/td><td>Process monitoring plus sampled destructive pull testing<\/td><td>Inline resistance measurement<\/td><\/tr><tr><td>Typical application<\/td><td>Prismatic and pouch busbar joints, large format<\/td><td>Cylindrical cells in high-count packs<\/td><td>Small cylindrical packs and lower-current duty<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-7387b849 wp-block-group-is-layout-flex\">\n<p class=\"has-text-align-left wp-block-paragraph\" style=\"font-size:29px\"><img decoding=\"async\" class=\"wp-image-503\" style=\"width: 65px\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/Frame-1.svg\" alt=\"\"><strong>&#8220;In a battery pack containing thousands of cell connections, every joint becomes a reliability and safety decision, making precise joining and inline verification fundamental to manufacturing quality.&#8221;<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-luminous-vivid-amber-color has-text-color has-link-color has-medium-font-size wp-elements-6bc6b22d4811b996eac9b48d6a42bdf4 is-horizontal is-content-justification-left is-nowrap is-layout-flex wp-container-core-group-is-layout-e8523bbf wp-block-group-is-layout-flex\" style=\"text-decoration:none\">\n<div class=\"wp-block-group is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-d9c85f36 wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image alignwide size-thumbnail\" style=\"margin-top:0;margin-right:0;margin-bottom:0;margin-left:0\"><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-150x150.png\" alt=\"\" class=\"wp-image-898\" srcset=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-150x150.png 150w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-300x300.webp 300w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2.webp 512w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cleantech.cybernetik.com\/\" data-type=\"link\" data-id=\"https:\/\/cleantech.cybernetik.com\/\">Cybernetik Cleantech Automation Team<\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\" style=\"font-size:34px\">See it in action<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Robotic Welding Cell | Cybernetik Robotic Automation\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/MY6qAXTfJy0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n<\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How the Decision Is Actually Made<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Four factors dominate, and they usually point clearly once stated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cell format. Large prismatic and pouch cells present substantial flat terminals and carry high current through few connections, which suits laser welding. Small cylindrical cells appear in large numbers with small terminals, which suits wire bonding and resistance welding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fault behavior. If the design intends a failed cell to isolate itself, wire bonding provides that inherently. If protection is handled at module or pack level instead, the interconnect does not need to fuse and the constraint disappears.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Heat sensitivity. Where cell construction or chemistry makes terminal heating a concern, the solid-state nature of wire bonding is a genuine advantage rather than a marginal one.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rate and joint count. Laser welding is fastest per joint and needs no consumable, which matters most where joint counts are high and takt time is tight. Against that, the fixturing needed to hold fit-up adds cost and changeover time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Verification Differs, and That Matters<\/strong><\/h2>\n\n\n\n<p class=\"has-link-color wp-elements-71ca9f37e9a78c87b76aa0d40572ce38 wp-block-paragraph\">How each method is checked shapes the quality system around it, which is covered more broadly in the guide to <a href=\"https:\/\/cleantech.cybernetik.com\/blog\/battery-quality-control\">battery quality control<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Laser welds can be assessed non-destructively at reasonable speed. Inline electrical resistance measurement immediately after welding catches weak joints in cycle, seam vision inspection identifies geometry defects, and optical depth measurement can confirm penetration. That combination allows verification of every joint rather than a sample.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wire bonds are verified differently. The bonder itself monitors deformation and ultrasonic response during each bond and can flag a non-stick immediately, which is genuine per-bond process control. Absolute bond strength, however, is established by destructive pull testing on samples, so the quality argument rests on process monitoring plus periodic validation rather than on measuring every joint outright.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neither approach is weaker, but they demand different things from the quality plan. A laser welded pack should have inline measurement on every joint. A wire bonded pack should have process monitoring on every bond and a disciplined sampling regime behind it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Which Format Uses Which<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_9e3f7c-72:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_9e3f7c-72 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_9e3f7c-72 ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_9e3f7c-72 .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_9e3f7c-72 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items2696_9e3f7c-72 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items2696_9e3f7c-72 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items2696_9e3f7c-72 ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items2696_9e3f7c-72 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-2696_34d0ab-9d .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_34d0ab-9d\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Large prismatic and blade cells. <\/strong>Laser welding of busbars to terminals, since current per connection is high and terminal geometry suits it.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_c33c15-7f .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_c33c15-7f\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Pouch cells. <\/strong>Laser or ultrasonic welding of tabs, chosen against tab material and thickness.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_a290cc-63 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_a290cc-63\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Cylindrical cells in high-count packs. <\/strong>Wire bonding where fusible behavior and low heat input are wanted, laser welding where rate and simplicity dominate.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_31e4f4-d2 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_31e4f4-d2\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Small cylindrical packs. <\/strong>Resistance welding of nickel strip remains common and appropriate at lower currents.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<p class=\"has-link-color wp-elements-320583c1a4126852aa7795fe69d8485e wp-block-paragraph\">The station sequence around joining is the same in each case, and is set out in the guide to <a href=\"https:\/\/cleantech.cybernetik.com\/blog\/lithium-battery-pack-assembly-process\">lithium battery pack assembly<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Joining in Cybernetik Battery Lines<\/strong><\/h2>\n\n\n\n<p class=\"has-link-color wp-elements-03e6229df788c99cb3753f8349d20735 wp-block-paragraph\">Cybernetik builds <a href=\"https:\/\/cleantech.cybernetik.com\/solutions\/battery-pack-assembly.html\">battery pack assembly automation<\/a> with laser and resistance welding within one line, and with weld verification treated as part of the joining station rather than as inspection added afterward.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Cybernetik joining capability<\/strong><\/th><th><strong>Specification<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Welding methods<\/td><td>Laser and resistance welding within one line<\/td><\/tr><tr><td>Weld verification<\/td><td>Inline weld integrity testing on every joint rather than sampled inspection<\/td><\/tr><tr><td>Module inspection<\/td><td>Weld integrity testing on both top and bottom module faces<\/td><\/tr><tr><td>Surface preparation<\/td><td>Plasma cleaning of terminals before welding<\/td><\/tr><tr><td>Placement verification<\/td><td>Vision-confirmed insulation application and cell polarity checking ahead of joining<\/td><\/tr><tr><td>Cell formats<\/td><td>Cylindrical 18650, 21700 and 32140, plus prismatic, pouch and blade<\/td><\/tr><tr><td>Cell diameters<\/td><td>32, 33, 35, 40, 42 and 46 mm<\/td><\/tr><tr><td>Line speed<\/td><td>Up to 6,000 cells per hour<\/td><\/tr><tr><td>Traceability<\/td><td>Barcode and RFID capture with MES connectivity and process logging<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Two details in that table follow directly from this article. Plasma cleaning before welding matters because surface oxide and handling contamination are the most common cause of scattered weld results that nobody can trace. And weld integrity testing on both module faces reflects the reality that a module has joints on two sides, and checking one side verifies half the pack.<\/p>\n\n\n\n<p class=\"has-link-color wp-elements-b59e7ff271b3f18bd8823ff43433029f wp-block-paragraph\">Cybernetik has operated for more than three decades, is headquartered in Pune with additional facilities in Gujarat and Raigad and international offices in the United States and UAE, and has installed over 6,000 systems across 30 plus countries, including more than 400 custom robotic automation solutions. In battery manufacturing that work has been delivered for manufacturers including Hero MotoCorp, TVS Motor, Livguard and Matter. Further background is on the <a href=\"https:\/\/cleantech.cybernetik.com\/about.html\">Cybernetik about page<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Why manufacturers choose Cybernetik<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_093907-bc:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_093907-bc ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_093907-bc ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_093907-bc .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items2696_093907-bc ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items2696_093907-bc ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items2696_093907-bc ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items2696_093907-bc ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items2696_093907-bc kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-2696_07a4f8-e4 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_07a4f8-e4\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Every joint measured, not sampled. <\/strong>Inline weld integrity testing in cycle, because a pack with thousands of joints inspected on a sampling plan is an unverified pack.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_fa3fb3-2a .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_fa3fb3-2a\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Verification on both module faces. <\/strong>Joints exist on two sides of a module, and checking one confirms half of them.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_365679-9c .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_365679-9c\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Surface prepared before joining. <\/strong>Plasma cleaning removes the oxide and contamination that produce inconsistent weld strength.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_625765-27 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_625765-27\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Multiple methods in one range. <\/strong>Laser and resistance welding available within the same line, so the method follows the cell format rather than the supplier position.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_ebdb30-a4 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_ebdb30-a4\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Format coverage. <\/strong>Cylindrical from 32 to 46 mm plus prismatic, pouch and blade at up to 6,000 cells per hour.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-2696_00b81f-e9 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2696_00b81f-e9\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Traceability from the first station. <\/strong>Weld results written against the cell and pack identifiers, so a field failure can be traced to a station and a shift.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group has-white-color has-text-color has-background has-link-color wp-elements-ac152bf2f15fc4c7252137b9076b5ae4 is-content-justification-space-between is-layout-flex wp-container-core-group-is-layout-bcf883e7 wp-block-group-is-layout-flex\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px;background-color:#12263a;margin-bottom:20px;padding-top:20px;padding-right:30px;padding-bottom:30px;padding-left:30px\">\n<h3 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-f22099acdeda5e510eedec4b07580a36 wp-container-content-29dca9c1\" style=\"font-size:34px;font-style:normal;font-weight:400;line-height:1.4\">Want to know more about our solution?<\/h3>\n\n\n\n<div class=\"wp-block-buttons wp-container-content-69bc4bdf is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-88867f99 wp-block-buttons-is-layout-flex\" style=\"border-style:none;border-width:0px;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-left-radius:0px;border-bottom-right-radius:0px;margin-top:0;margin-bottom:0;padding-top:6;padding-right:6;padding-bottom:6;padding-left:6\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-100 is-style-fill\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color has-text-align-right wp-element-button\" href=\"https:\/\/meetings-eu1.hubspot.com\/anand-gaikar\" style=\"background-color:#ee8d26;padding-top:10px;padding-right:20px;padding-bottom:10px;padding-left:20px\">Book a call<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\"><strong>Frequently asked questions<\/strong><\/h2>\n\n\n<style>.kt-accordion-id2696_fbc6ad-de .kt-accordion-inner-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:14px;}.kt-accordion-id2696_fbc6ad-de .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;background:#ffffff;padding-top:var(--global-kb-spacing-md, 2rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:0px;padding-left:var(--global-kb-spacing-sm, 1.5rem);}.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:0px solid #949494;border-right:0px solid #949494;border-bottom:1px solid #abb8c3;border-left:0px solid #949494;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;background:#ffffff;font-size:var(--global-kb-font-size-md, 1.25rem);line-height:1.5em;letter-spacing:-0.1px;font-weight:400;text-transform:capitalize;color:#12263a;padding-top:14px;padding-right:10px;padding-bottom:16px;padding-left:16px;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:before{background:#12263a;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger{background:#12263a;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id2696_fbc6ad-de .kt-blocks-accordion-header:focus-visible{color:#12263a;background:#ffffff;border-top-color:#474747;border-top-style:solid;border-right-color:#474747;border-right-style:solid;border-bottom-color:#474747;border-bottom-style:solid;border-left-color:#474747;border-left-style:solid;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:before, body:not(.hide-focus-outline) .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-blocks-accordion--visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#ff6900;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger, body:not(.hide-focus-outline) .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger{background:#ff6900;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:before, body:not(.hide-focus-outline) .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}.kt-accordion-id2696_fbc6ad-de .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{color:#12263a;background:#ffffff;border-top-color:#abb8c3;border-top-style:solid;border-right-color:#abb8c3;border-right-style:solid;border-bottom-color:#abb8c3;border-bottom-style:solid;border-left-color:#abb8c3;border-left-style:solid;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#ff6900;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger{background:#ff6900;}.kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id2696_fbc6ad-de:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}@media all and (max-width: 1024px){.kt-accordion-id2696_fbc6ad-de .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;}}@media all and (max-width: 1024px){.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:0px solid #949494;border-right:0px solid #949494;border-bottom:1px solid #abb8c3;border-left:0px solid #949494;}}@media all and (max-width: 1024px){.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id2696_fbc6ad-de .kt-blocks-accordion-header:focus-visible{border-top-color:#474747;border-top-style:solid;border-right-color:#474747;border-right-style:solid;border-bottom-color:#474747;border-bottom-style:solid;border-left-color:#474747;border-left-style:solid;}}@media all and (max-width: 1024px){.kt-accordion-id2696_fbc6ad-de .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top-color:#abb8c3;border-top-style:solid;border-right-color:#abb8c3;border-right-style:solid;border-bottom-color:#abb8c3;border-bottom-style:solid;border-left-color:#abb8c3;border-left-style:solid;}}@media all and (max-width: 767px){.kt-accordion-id2696_fbc6ad-de .kt-accordion-inner-wrap{display:block;}.kt-accordion-id2696_fbc6ad-de .kt-accordion-inner-wrap .kt-accordion-pane:not(:first-child){margin-top:14px;}.kt-accordion-id2696_fbc6ad-de .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;}.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:0px solid #949494;border-right:0px solid #949494;border-bottom:1px solid #abb8c3;border-left:0px solid #949494;}.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id2696_fbc6ad-de .kt-blocks-accordion-header:focus-visible{border-top-color:#474747;border-top-style:solid;border-right-color:#474747;border-right-style:solid;border-bottom-color:#474747;border-bottom-style:solid;border-left-color:#474747;border-left-style:solid;}.kt-accordion-id2696_fbc6ad-de .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id2696_fbc6ad-de > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top-color:#abb8c3;border-top-style:solid;border-right-color:#abb8c3;border-right-style:solid;border-bottom-color:#abb8c3;border-bottom-style:solid;border-left-color:#abb8c3;border-left-style:solid;}}<\/style>\n<div class=\"wp-block-kadence-accordion alignnone\"><div class=\"kt-accordion-wrap kt-accordion-id2696_fbc6ad-de kt-accordion-has-19-panes kt-active-pane-0 kt-accordion-block kt-pane-header-alignment-left kt-accodion-icon-style-none kt-accodion-icon-side-right\" style=\"max-width:none\"><div class=\"kt-accordion-inner-wrap\" data-allow-multiple-open=\"false\" data-start-open=\"0\">\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-1 kt-pane2696_3126b9-48\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">What is the difference between laser welding and wire bonding for battery cells?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Laser welding fuses busbar and terminal material together, producing a fast joint with a large conductive cross-section and no consumable. Wire bonding uses ultrasonic energy and force to create a solid-state bond with an aluminum wire, without melting. The wire also acts as a fuse under fault current, isolating a failed cell, which a fusion weld does not do.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-2 kt-pane2696_953968-b2\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Why is copper difficult to laser weld?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Because copper reflects the great majority of conventional infrared laser wavelengths at room temperature, so very little energy enters until the surface heats, at which point absorption rises sharply and the process can become unstable. Green and blue wavelength lasers are absorbed far more readily, and beam oscillation stabilizes the melt pool when infrared sources are used.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-3 kt-pane2696_f57b11-0b\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Why does wire bonding act as a fuse?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Because the bond wire has a small cross-section relative to the current a shorted cell can draw. Under fault conditions the wire heats and melts, disconnecting that cell from the pack. In a high-cell-count pack this turns a single cell failure into a small capacity loss rather than an event that neighboring cells feed energy into.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-11 kt-pane2696_9ca56d-f9\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Which method puts less heat into the cell?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Wire bonding, by a clear margin, because it is a solid-state process with no melting. Laser welding introduces low but real heat that is controlled through parameters, and resistance welding puts in the most of the three. Since cell terminals sit millimeters from separator and electrolyte, heat input is a genuine design constraint rather than a detail.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-18 kt-pane2696_836620-3f\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">How are these joints verified in production?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Laser welds can be checked non-destructively at rate, through inline electrical resistance measurement immediately after welding, seam vision inspection and optical depth measurement, which allows every joint to be verified. Wire bonds are monitored during bonding through deformation and ultrasonic response, with absolute strength established by destructive pull testing on samples.<\/p>\n<\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n<p class=\"has-white-color has-text-color has-link-color wp-elements-c645e628e62f8fbab9d9726851472d16 wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Every cell in a battery pack has to be joined electrically to its neighbors, and in a pack containing several hundred cylindrical cells that means thousands of individual connections&#8230;<\/p>\n","protected":false},"author":4,"featured_media":2729,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[29],"class_list":["post-2696","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cleantech","tag-cleantech"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Laser Welding vs Wire Bonding: Cell Interconnects | Cybernetik<\/title>\n<meta name=\"description\" content=\"Laser welding, wire bonding and resistance welding compared for battery cell interconnects: heat input, fusible behavior, verification and format suitability.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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