High-strength composite copper foil

Abstract

The utility model relates to lithium battery technical field especially, more particularly to a kind of high-strength composite copper foil, the high-strength composite copper foil includes high molecular matrix layer, upper copper plating layer and lower copper plating layer, the upper copper plating layer is set on the high molecular matrix layer upper surface.By using the high molecular matrix layer of two-way stretch modification as substrate, the tensile strength of substrate is improved by modification technology, compared with the high molecular matrix of traditional low tensile strength high elongation, the high molecular matrix layer has significant improvement in tensile strength, can resist the influence of external force on copper foil, while maintaining certain ductility, which effectively avoids the fracture problem of copper foil in production process, even in process operation appears excessive stretching, copper foil can be directly broken when close to certain elongation, instead of appearing "hidden fault" problem, which helps to ensure the stability in subsequent production process, avoids the potential problem that copper layer is not easy to be found due to poor compactness.

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