As a new generation of green, high energy rechargeable battery, lithium ion battery has the outstanding advantages of high voltage, high energy density, good recycling performance, small self discharge and no memory effect, and it has made rapid development in recent years; with the emerging of new energy vehicles, demand for lithium batteries is also growing rapidly.

Lithium battery mainly consists of positive pole, negative pole, diaphragm and electrolyte. The primary material of battery current collector is the metal foil, and it collects the current to form a large current output. Rolled copper foil has good electrical conductivity, flexibility, moderate potential and high bending resistance without cracks, so it is widely used as negative current collector of some high-end lithium ion batteries.