| abstract |
An object of the present invention is to provide a technique in which, in a battery packaging material including a film-like laminate in which at least a base layer, an adhesive layer, a metal layer, and a sealing layer are laminated in this order, the base layer Since the polyester film is included, the electrolyte resistance is further improved, cracks and pinholes are not easily generated during molding of the base material layer including the polyester film, and it has excellent moldability. The solution of the present invention is to provide a packaging material for batteries, which includes a laminate in which a base material layer, an adhesive layer, a metal layer and a sealing layer are laminated in sequence at least, the base material layer includes a polyester film, and the above The metal layer is the tensile elongation at break when the 0.2% yield strength is 55 to 140 N/mm 2 when the tensile test is carried out in the direction parallel to the rolling direction and the tensile test is carried out in the direction parallel to the rolling direction. Aluminum foil with a rate of 7 to 12%. |