From the working principle of lithium-ion batteries, it can be known that the current collector not only plays the role of carrying active substances, but also collects the electrons generated by electrochemical reactions and conducts them to the external circuit, thereby realizing the process of converting chemical energy into electrical energy. The current collector is one of the indispensable components in lithium-ion batteries. At present, the thickness of the positive electrode aluminum foil current collector used in battery cell production is between 10~20um, and the thickness of the negative electrode copper foil is between 6~8um. The aluminum foil is mainly made of rolled aluminum foil, and the copper foil is mainly made of electrolytic copper foil.