The functions of composite metal foil mainly include the following aspects:
Improve battery safety: Composite metal foil, such as composite aluminum foil, can effectively improve the thermal runaway problem of the battery and improve the high thermal stability of the battery through its sandwich structure (such as "aluminum-PET polymer material support layer-aluminum" structure). When the battery is hit by external force, this structure can reduce the generation of metal burrs, avoid puncturing the battery separator, and reduce the risk of battery short circuit, thereby greatly improving the safety of the battery.
Increase energy density: Composite metal foil can greatly reduce the amount of metal used while keeping the thickness unchanged, thereby reducing the overall mass. This helps to reduce the amount of aluminum used inside the battery, so that the energy density can be increased at the same weight, thereby increasing the energy density of the battery.
Reducing costs: In the production process of composite metal foil, by setting a conductive anti-corrosion layer on one side of the functional layer instead of the traditional peeling layer, there is no need to peel when making the circuit, and an ultra-thin functional layer can be made, and the amount of flash corrosion can be effectively reduced, and the circuit accuracy and reliability of the circuit board can be improved. This design not only simplifies the production process, but also reduces costs.
Improving current distribution: Composite metal foil can be formed by stacking multiple layers of metal foil in parallel, with high degree of freedom in the stacking method and small conductor size. Multiple coils can be formed by winding wires on the current-sharing magnetic ring. By using the mutual inductance of the coils, the current change trend of each layer of metal foil is basically the same, thereby reducing or eliminating the problem of uneven current in multiple layers of metal foil.