Patent ID: 8541080

Claim:
A battery case comprising a packaging material for battery cases comprising: a heat resistant resin oriented film layer constituting an outer layer; a thermoplastic resin non-oriented film layer constituting an inner layer; and an aluminum foil layer disposed between the inner and outer layers, wherein the heat resistant resin oriented film comprises a biaxially-oriented polyamide film having a shrinkage percentage of 2 to 20%, wherein the shrinkage percentage denotes a size change rate of a test piece in the oriented direction before and after the immersion of the test piece (10 cm×10 cm) of the biaxially oriented polyamide film in 95° C. hot water for 30 minutes, and can be obtained by the following equation, which is an average value of the size change rates in two oriented directions: shrinkage percentage(%)={( X−Y )/ X}× 100 X: oriented directional size before the immersion treatment Y: oriented directional size after the immersion treatment, wherein a thickness of the biaxially-oriented polyamide film layer is 12 to 50 μm, a thickness of the thermoplastic resin non-oriented film layer is 20 to 80 μm and a thickness of the aluminum foil layer is 5 to 50 μm, wherein the biaxially-oriented polyamide film layer and the aluminum foil layer are integrally laminated via a urethane series adhesive layer, wherein the aluminum foil layer and the thermoplastic resin non-oriented film layer are integrally laminated via an acid-modified polyolefin adhesive layer, and a deep drawing or stretch forming is performed on the packaging material for battery cases.