Aluminum-plastic film is the key material for the packaging of lithium battery cells in soft packaging. It is a high-strength, high-barrier multilayer composite material composed of a variety of plastics, aluminum foil and adhesives. After the monolithic battery is assembled, it is sealed with an aluminum-plastic film to form a battery, and the aluminum-plastic film protects the contents. The aluminum-plastic composite film for soft-pack lithium batteries has good barrier properties, electrolyte stability, cold stamping formability, puncture resistance and insulation. It is the most critical safety link in soft-pack lithium batteries and is extremely technically required. A harsh composite material.