| 摘要 |
PROBLEM TO BE SOLVED: To provide a package material for a battery case capable of assuring a good formation property even without coating a component imparting slip properties and also obtaining sufficient volume capacity rate. SOLUTION: The package material for a battery case includes a heat resistant resin stretched film layer 2 as an outside layer, a thermoplastic resin unstretched film layer 3 as an inside layer, and an aluminum foil layer 4 provided between both above film layers. The heat resistant resin stretched film layer 2 is structured of a heat resistant resin stretched film with a crystallinity degree of 5 to 20%. COPYRIGHT: (C)2007,JPO&INPIT
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