Flexible Copper Foil Connectors
Products Description
We divide our Flexible copper foil connectors design into two core technology paths to precisely address the differentiated needs of various industries:
1. Dedicated Flexible Connections for New Energy Vehicle (EV) Power Batteries
Addressing the compact space and stringent lightweight requirements of lithium-ion battery packs, our small-sized copper foil flexible connections possess extremely high flexibility.
Applications: Inter-module busbars, cell terminal connections, BMS power distribution systems.
Technical Characteristics: Absorbs expansion stress during battery charge-discharge cycles, preventing terminal damage.
2. High-Current Connections for Power and Heavy Industry
For high-power equipment such as transformers, switchgear, and electrolytic aluminum, we provide large-section copper foil compensators.
Applications: Transformer leads, generator set connections, electroplating equipment, busbar expansion joints.
Technical Characteristics: Effectively mitigates electromagnetic vibration and thermal displacement during equipment operation.
Detailed Display
Microscopic Interface
Metallographic sampling reveals a continuous copper grain interface across the diffusion-welded bonding zone, with no obvious solder residue or oxide inclusions. The bonding line is almost indistinguishable, ensuring low resistance and high reliability.
End Face Treatment
The lap joint surfaces are precision-milled to achieve mirror-like flatness, allowing for surface-to-surface contact rather than line contact during bolt tightening, significantly reducing contact resistance. Mounting holes are CNC machined with diameter tolerances controlled at H12, ensuring a precise fit with M6/M8 standard bolts.
Edge Quality
Die-cut edges are burr-free and delaminated. The cut surfaces of each Copper Foil Flexible Busbar with Insulated Tube layer are neat and consistent, avoiding the risk of interlayer short circuits or insulation layer punctures caused by burrs.
Surface Consistency
The plating uniformly covers all exposed copper surfaces, including the end areas of interlayer gaps, effectively preventing electrochemical corrosion from penetrating from the edges inwards for the Copper Foil Battery Busbar Connector.
Main Functions: Systemic Protection Beyond Simple Conductivity
| High-Frequency Mechanical Stress Absorption | In the driving of new energy vehicles or the vibration of industrial equipment, the flexible connector can effectively absorb mechanical vibration and inertial impact in the X, Y, and Z axes, preventing rigid forces from being transmitted to fragile battery cell terminals or electrical component solder joints. |
| Three-Dimensional Thermal Expansion and Contraction Compensation | When a large current passes through, the copper busbar will experience significant thermal expansion. The deformation capability of the flexible area can perfectly absorb this axial and lateral dimensional deviation, preventing the disaster of "thermal stress tearing." |
| Reduced Eddy Current and Skin Effect Losses | Compared to solid copper busbars, the multi-layer thin-film structure can significantly reduce the increase in resistance caused by the skin effect in an alternating magnetic field. Simultaneously, through interlayer insulation, Laminated Foils Flexible Copper Busbar effectively cuts off internal eddy current loops, reducing high-frequency heating. |
| Perfect Completion of Installation Tolerances | In the assembly process of large-scale complete sets of electrical equipment, machining tolerances and installation misalignments are unavoidable. The flexibility of New Energy Battery Copper Foil Flexible Connector allows them to absorb these tolerances like a "spring," significantly reducing assembly difficulty and the defect rate. |
Material Advantages – Engineering Choices from Copper Foil to Surface Treatment
Substrate: High-conductivity, high-purity Copper Foil Battery Busbar Connector
Uses national standard T2 or American standard C11000 electrolytic copper, with a conductivity ≥98% IACS (International Annealed Copper Standard) and a resistivity as low as 0.01724 Ω·mm²/m.
The copper foil surface is free of oxidation, oil, and pinholes, and shows no red rust after a 24-hour neutral salt spray test (NSS).
Multi-layer lamination structure provides skin effect compensation – under AC or high-frequency ripple current, the total AC resistance is lower than that of a single copper busbar of the same cross-section.
Surface Treatment: Tin plating / Silver plating / Bare copper optional
Tin plating: Suitable for the environment of new energy vehicle batteries (trace electrolyte evaporation, humidity), with a plating thickness of 8~12μm, good solderability, and prevention of verdigris.
Silver plating: Used at the contact terminals of high-current switchgear, reducing contact resistance, resisting oxidation, and resulting in lower temperature rise (suitable for continuous current carrying >800A scenarios).
Bare copper + anti-oxidation: Used in enclosed distribution boxes, with an organic protective film coating for cost optimization.
Insulation Material Advantages
Silicone rubber tubing: Wide temperature range of -40℃ to 200℃, flexible and non-brittle, suitable for long-term vibration environments within battery packs.
Polyester film (PET) winding: Only 0.1mm thick, does not increase the overall outer diameter, suitable for extremely compact applications.
contact us
When your battery pack or power system demands more than just a conductor-it requires an engineered flexure that survives a decade of thermal cycles and road vibrations-our diffusion-bonded Laminated Flexible Copper Foil Tape delivers metallurgical-grade reliability without compromise; request your technical datasheet and sample evaluation today to see how we solve interconnection fatigue before it becomes a field failure.
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