Aluminum Laminated Film for Battery Insulation is a high-strength, high-barrier multilayer material laminated of various plastic films, rolled aluminum foil, and adhesives.

A typical structure of aluminum-plastic laminated film consists of three layers: ON (Nylon layer) / AL (Aluminum layer) / CPP (Polypropylene layer). The outermost nylon layer primarily serves as a protective layer; the aluminum layer acts as the core material, providing waterproofing and barrier properties; the polypropylene layer functions in heat sealing and additional barrier properties, separating the aluminum layer from the battery cell to prevent electrolyte leakage and corrosion of the aluminum foil. The adhesive bonds the nylon layer to the aluminum layer and the aluminum layer to the polypropylene layer. This aluminum-plastic laminate film is a critical material in lithium battery soft-packaging, representing one of the most technologically advanced and challenging materials in the field.