Custom Flexible Copper Busbar & PVC Dipped Rigid T2 Copper Busbar for EV Power Lithium Battery

Short Description

Engineered for high-current, high-reliability electrical connections in New Energy Vehicles (EV/HEV) and Lithium Battery Packs. We specialize in OEM manufacturing of Laminated Flexible Copper Busbars (via polymer diffusion welding) and PVC Dipped Insulated Rigid Copper Busbars (via laser cutting, stamping, punching, and CNC bending). Featuring high-purity T2/C11000 red copper and precision tin, nickel, or silver surface plating, our connectors ensure low contact resistance, vibration absorption, and superior dielectric safety.

• Dual Core Solutions: Both Laminated Flexible Copper Connectors (for cell-to-cell vibration absorption) and PVC Dipped Solid Copper Busbars (for rigid high-voltage distribution).

• Precision Fabrication: Fiber laser cutting, high-speed stamping, CNC bending, and polymer diffusion welding.

• Selective Surface Plating: Tin plated, nickel plated, or silver plated contact pads for anti-oxidation and ultrasonic/laser welding compatibility.

• Strict Quality Compliance: Manufactured to your 2D/3D CAD drawings with UL94 V-0 flame-retardant PVC insulation.

Core Products & Manufacturing Capabilities

• 1. Laminated Flexible Copper Busbars 
  Constructed from multiple layers of ultra-thin high-purity copper foil (0.05mm – 0.3mm) bonded together via polymer diffusion welding  or ultrasonic welding. Ideal for absorbing thermal expansion and mechanical vibration between lithium battery cells and modules without stressing terminal posts.

• 2. PVC Dipped Insulated Rigid Copper Busbars 
  Precision-processed from solid T2/C11000 red copper strips through laser cutting, punching, and 3D bending, followed by seamless PVC plastisol dipping. Provides superior electrical insulation, moisture protection, and mechanical rigidity for battery pack main power distribution and PDU/BDU units.

• 3. Functional Surface Plating Options 
  To match your specific joining method (bolting, laser welding, or ultrasonic bonding) and operating environment, we offer precision selective or full surface plating:

  • Tin Plating : Cost-effective anti-oxidation protection with excellent solderability and reliable bolted contact performance.

  • Nickel Plating : Superior hardness, wear resistance, and high-temperature corrosion protection for harsh automotive environments.

  • Silver Plating : Lowest contact resistance and highest electrical/thermal conductivity for ultra-high-current EV applications.

Technical Specifications

Primary Applications

• EV & HEV Power Battery Packs: Cell-to-cell flexible connections, module-to-module interconnectors, and high-voltage main busbars.

• Battery Distribution Units (BDU / PDU): Compact, 3D-bent PVC insulated rigid copper busbars for high-density power routing.

• Energy Storage Systems (ESS): Commercial & industrial battery racks, inverters, and high-current charging piles.

FAQ

Q1: Should I choose Tin, Nickel, or Silver plating for my EV battery copper busbars?
A: Tin plating is the most economical choice for standard bolted connections and general anti-oxidation. Nickel plating is ideal if your busbars are exposed to high heat, corrosive conditions, or require laser welding to steel/nickel battery tabs. Silver plating is recommended for extreme high-current applications requiring the lowest possible contact resistance.

Q2: What is the advantage of polymer diffusion welding for flexible copper busbars?
A: Polymer diffusion welding bonds copper foil layers under high temperature and pressure without adding solder or flux. This results in zero extra resistance at the weld zone, ultra-high peel strength, and superior flexibility in the unbonded middle section to absorb battery swelling and road vibration.

Q3: Can you keep the bolt holes and laser-welding areas free of PVC insulation?
A: Yes. Using precision masking tooling during the PVC dipping process, we ensure that all contact pads, mounting holes, and laser-welding zones remain completely exposed and cleanly plated with tin, nickel, or silver.

Q4: How fast can you deliver custom prototypes without opening expensive stamping molds?
A: By utilizing precision fiber laser cutting and CNC bending for prototyping, we can deliver custom samples in [5 to 7 working days] with zero hard-tooling cost, then transition to high-speed progressive stamping dies for mass production.