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Copper Supply and Fabrication in Kokomo, IN — EV Battery and Powertrain Electrical Applications

The electrification wave hitting Kokomo through Samsung SDI's battery manufacturing campus has made copper one of the fastest-growing material categories in the local supply chain. Every battery cell, module, and pack requires copper busbars, flexible interconnects, and terminal hardware — and the electrical efficiency requirements of EV battery systems mean conductor purity and contact surface quality matter in ways that commodity copper sheet cannot satisfy. C101 oxygen-free copper and C110 electrolytic tough pitch are the foundation; tellurium copper serves the precision machined component market. ManufacturingBase maps copper suppliers and fabricators serving the Kokomo industrial corridor so procurement teams can find qualified sources efficiently.

ISO 9001IATF 16949ISO 14001
C101 oxygen-free high-conductivity copper (OFHC) is the premium grade for EV battery busbar and electrical interconnect applications. With electrical conductivity at 101 percent IACS (International Annealed Copper Standard) and virtually zero oxygen content — under 0.0005 percent — C101 minimizes resistive losses across battery module interconnects and eliminates the risk of hydrogen embrittlement in welded or brazed assemblies. For Samsung SDI's Kokomo battery modules, where hundreds of cell-to-cell interconnects carry charge and discharge current continuously over a 15-year design life, conductor material quality directly affects system efficiency and thermal performance. C101 strip in gauges from 0.010 inch to 0.125 inch and widths to 24 inch is the standard form for stamped and formed busbar blanks. C110 electrolytic tough pitch copper — 99.9 percent minimum purity, conductivity at 100 percent IACS — is the workhorse grade for general electrical and thermal applications where the slight oxygen content of 0.02 to 0.05 percent is not a concern. Bus bars, terminal blocks, grounding straps, heat spreaders, and general wiring hardware in automotive electrical systems use C110 bar, rod, and strip as the standard starting material. C110 is more broadly stocked than C101 at regional service centers, making it the default choice for procurement teams that need standard delivery windows on non-oxygen-sensitive applications. Tellurium copper — C14500, 0.4 to 0.7 percent tellurium addition — sacrifices a small fraction of conductivity (conductivity at 93 to 95 percent IACS) in exchange for dramatically improved machinability. Free-cutting copper grades like tellurium copper machine at 80 to 90 percent of free-machining brass C360, compared to 20 to 25 percent for pure C110. This makes tellurium copper the standard for precision turned electrical contacts, connector pins, solenoid terminal fittings, and threaded hardware where machining cycle time and surface finish matter as much as electrical performance. Kokomo shops running solenoid and actuator components for Stellantis transmission valve bodies use tellurium copper bar for the electrical contact components within these assemblies.

Busbar Fabrication and Stamping for Battery Module Applications

Battery module busbars in EV applications are precision stampings — not simply cut plate. The dimensional and surface requirements for cell-to-cell interconnects include flatness within 0.005 inch across the busbar length, hole location tolerance within 0.003 inch for cell terminal engagement, and edge condition control that prevents sharp burrs from causing internal short circuits or membrane damage in module assembly. These requirements place battery busbar stamping squarely in the precision stamping tier, not general sheet metal work. Progressive dies running C101 or C110 strip at 0.020 inch to 0.080 inch gauge produce busbar blanks at 30 to 80 strokes per minute in 30-ton to 100-ton presses. Critical die design elements for copper busbar stampings include proper shear angle on cutting elements to minimize burr height, rounded punch corners to prevent tear-out on pre-plated copper, and die clearances of 5 to 7 percent of material thickness to balance clean cut edge against secondary burr. Shops running high-volume copper stamping must manage die wear carefully — copper is softer than steel stampings but its ductility accelerates die face wear in ways that steel work does not. Post-stamp operations for busbars include nickel, tin, or silver plating of contact surfaces to prevent copper oxide formation at electrical interfaces. Copper oxide is resistive and causes contact heating in high-current applications — a plated contact surface maintains low contact resistance over the 15-year design life that EV battery packs require. Nickel-plated copper busbars are the most common solution; silver plating is specified for highest-performance applications where absolute contact resistance minimization justifies the cost premium. Regional plating shops serving the Kokomo and Indianapolis corridor can plate copper components with current delivery windows of one to two weeks.

CNC Machining of Tellurium Copper for Precision Electrical Components

Tellurium copper's machinability makes it the preferred grade when precision machined electrical contacts, solenoid terminals, and connector hardware need to be produced at high volume with tight dimensional tolerances and consistent surface finish. Swiss-type CNC turning centers running tellurium copper bar from 0.125-inch to 2-inch diameter produce electrical contact pins, banana jacks, coaxial connectors, and solenoid pole pieces at feed rates and cycle times approaching those of free-cutting brass, while maintaining 93 to 95 percent IACS conductivity that general brass (C360, roughly 26 percent IACS) cannot approach. Dimensional tolerances of plus or minus 0.001 inch on OD and bore features are routine for Swiss-type turning of tellurium copper. Surface finish of Ra 32 to Ra 16 microinch is achievable on finished turning passes; Ra 8 requires polishing or burnishing on contact surfaces where electrical interface smoothness matters. Thread quality in machined tellurium copper — critical for terminal hardware that will be torqued repeatedly during assembly — benefits from the material's chip-breaking characteristics that keep threads clean and burr-free through the full thread engagement depth. Kokomo shops that machine solenoid components for Stellantis's transmission solenoid valve assemblies are the most natural sources for precision copper machined parts in the region. The same fixturing, CNC turning equipment, and quality management systems that handle 17-4PH solenoid shafts and valve spools also handle tellurium copper electrical contacts, with tooling and cutting parameter adjustments to accommodate copper's very different machining behavior. Ask suppliers whether they use dedicated machines or shared tooling for copper work — cross-contamination of copper chips into steel components creates quality problems in both directions.

Frequently Asked Questions

EV battery busbars carry cell charge and discharge currents continuously over a vehicle design life that may exceed 200,000 miles or 15 years. At high current loads — 200 to 500 amperes in large battery packs — even small differences in conductor resistivity produce meaningful differences in resistive heat generation. C101 OFHC copper at 101 percent IACS versus C110 at 100 percent IACS seems like a negligible difference, but in a system with hundreds of busbar interconnects, the aggregate resistive loss difference compounds across the full pack and affects both efficiency and thermal management load. The more critical distinction is oxygen content. C110 contains 0.02 to 0.05 percent dissolved oxygen as cuprous oxide. When C110 is welded or brazed — processes used to join busbars to cell terminals — dissolved hydrogen in the weld zone reacts with cuprous oxide to form steam, creating voids and porosity in the joint. These hydrogen embrittlement failures cause increased resistance and mechanical weakness at weld joints under thermal cycling. C101's near-zero oxygen content eliminates this mechanism, producing dense, void-free welds that maintain low contact resistance through millions of thermal cycles. For Samsung SDI's Kokomo production, where busbar weld quality directly affects pack safety and reliability, C101 or equivalent OFHC specification is the standard.
The primary plating options for copper busbars in Kokomo's EV supply chain are nickel, tin, and silver, each suited to different performance and cost requirements. Nickel plating — typically 0.0002 to 0.0005 inch deposit — is the most common solution for battery module busbars. Nickel prevents copper oxidation at electrical contact interfaces, survives the 85 to 105 degree Celsius continuous operating environment of battery modules, and accepts solder or ultrasonic welding for cell terminal attachment. The nickel layer maintains contact resistance below 0.5 milliohm at standard bolt torque through the design life. Tin plating provides similar oxidation protection at lower cost and is preferred for lower-temperature applications and board-level hardware. Silver plating — deposit thickness 0.0001 to 0.0003 inch — minimizes contact resistance to the lowest achievable values and is specified for highest-efficiency power distribution busbars, high-frequency applications, and connectors where thermal performance is critical. Cost is roughly ten times tin plating at equal deposit thickness. Electroless nickel is an alternative to electrolytic nickel where uniform coverage of complex geometries or threaded features is required, as electroless deposits do not vary with current density. Regional plating shops in Indianapolis and Muncie handle all these processes with Kokomo pickup and delivery service on standard production runs.
Copper sheet and strip for stamping operations in the Kokomo area primarily sources from national copper service centers — Wieland, Mueller Industries, and Olin Brass maintain distribution positions in the Midwest with delivery to Indiana fabricators typically in two to five business days for standard catalog sizes. C110 strip in common gauges — 0.020 inch, 0.032 inch, 0.050 inch, 0.063 inch, 0.080 inch, 0.125 inch — in widths to 48 inch is stocked inventory. C101 OFHC strip carries slightly longer lead times and narrower size availability, as its demand profile is more specialized. For high-volume stamping operations running coil-fed progressive dies, blanket coil supply agreements directly with copper mills or service centers are standard practice. These agreements lock in price against a commodity index — COMEX copper futures plus a fabrication premium — and guarantee supply allocation for contracted volumes. Given copper's commodity price volatility — LME copper has ranged from roughly $3.50 to $4.80 per pound within recent three-year windows — price agreement structure matters significantly for contract pricing to downstream customers. Stamping shops serving Samsung SDI's busbar requirements in Kokomo manage this exposure through pass-through pricing, fixed-formula escalation in long-term contracts, or hedging through their copper service center partners.
Copper sheet stamping requires process adjustments compared to steel, but the core equipment — punch presses, progressive and transfer dies, and press brakes — is the same. The key differences that a capable shop must manage are springback behavior, die clearance requirements, lubrication selection, and surface quality sensitivity. Copper has significantly different springback characteristics than HSLA steel — it is more ductile and forms cleanly at smaller radii, but its elastic springback requires overbend compensation built into die geometry to achieve target flange angles. Die clearances for copper run 5 to 8 percent of material thickness versus 10 to 12 percent for steel, and must be maintained precisely to achieve clean shear edges without excessive burr. Lubrication for copper stamping uses light-viscosity oils and emulsions that do not react with copper or leave staining residues on the plated or bare copper surface. Petroleum-based lubricants containing sulfur compounds — common in steel stamping — cause copper sulfide surface staining that affects electrical contact performance and plating adhesion. Clean stampings arriving at plating shops free of sulfur contamination plate more uniformly and with better adhesion. Shops transitioning from steel to copper stamping need to qualify their lubricant selection and cleaning processes before production, ideally with input from their plating sub-supplier on acceptable incoming surface chemistry. Kokomo-area shops with automotive stamping heritage and clean-room cleaning capability are best positioned for copper busbar work.
Tellurium copper bar for machined electrical components is stocked by regional service centers in Indianapolis and is typically available in two to three business days for diameters from 0.25 inch to 3 inch. For parts machined on Swiss-type CNC turning centers — the primary production platform for precision copper electrical contacts — first-article lead times run three to five weeks from purchase order to delivery, including programming, first-piece inspection, and any required plating. Production releases on approved parts in running programs typically compress to two to three weeks. C110 rod and bar for machined terminal hardware carries one to three day material lead time, with machining adding three to four weeks for first articles. C101 OFHC bar is a specialty stocking item with four to seven day material lead time in standard sizes. If your copper components require post-machine plating — nickel, tin, or silver — add one to two weeks for the finishing cycle through regional plating shops. Total lead time from purchase order to plated, inspected, and packaged copper electrical components runs five to eight weeks for first articles and three to five weeks for production releases in established programs.

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Last updated: July 2026

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