TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Properties: When the temperature of the battery case rises to 120-160 degrees C, while the penetration exhaustion path connecting with the interior space of the battery case generates peeling clearance gap connecting with the penetration exhaustion path generated between the metal foil layer and inner side layer, in the inner side layer, bursting of the battery case by inner pressure rise when the gas within the battery case passes out through the penetration exhaustion path and peeling clearance gap is prevented. A heat seal portion is formed in the inner side layers of the packaging material when the temperature of the battery case rises to 120-160 degrees C, and bursting of battery case by inner pressure rise when the inner-and-outer communication exhaustion path which connects the interior space and exterior of the battery case arises and gas within the battery case passes through outside through the inner-and-outer communication exhaustion path, is prevented.    TECHNOLOGY FOCUS - POLYMERS - Preferred Layers: The packaging material has a heat resistant resin layer as an outer side layer (2), the thermoplastic resin layer as inner side layer, and the metal foil layer arranged as the interlayer. Alternately, the thermoplastic resin layer is a laminated structure of two or more layers which has the mixed resin layer arranged in innermost portion, and single resin layer which consists of polyolefin resin arranged between the mixed resin layer and metal foil layer. Preferred Component: The melt flow rate of resin (I) and resin (II) is 10 g/10 minute or more, and less than 10 g/10 minute, respectively. The melting point of resin (I) and resin (II) is 105-140 degrees C, and 135-180 degrees C, respectively. The melting point of resin (II) is more than the melting point of resin (I) by 3 degrees C or more. The polyolefin resin is polyethylene resin, polypropylene resin, propylene homopolymer or ethylene propylene copolymer. Preferred Process: The metal foil layer and thermoplastic resin layer are integrally laminated through adhesive bond layer (6) having melting point of 60-100 degrees C and formed by dry lamination method. One or more of the packaging material is molded by 3-dimensional shape by deep draw forming or stretch forming.