Patent ID: 7972722
Filing Date: 2011-07-05
Classification: H01M,Y02E,Y02P

Abstract:
1. A lead sealant film for use in sealing an electrode terminal lead of a non-aqueous electrolyte battery, the lead sealant film comprising: a laminated structure composed of an inner layer formed directly on a surface of an intermediate layer and an outer layer formed directly on a surface of the intermediate layer opposite to the surface on which the inner layer is formed; and wherein: the intermediate layer includes a first acid-modified polypropylene having a first melting-point, and each of the inner layer and the outer layer includes a second acid-modified polypropylene having a second melting-point that is lower than the first melting-point, and wherein a difference between the first melting point and the second melting point is from 20° C. to 25° C., wherein the first and second acid-modified polypropylenes are modified with maleic anhydride and have molecular weights of at least 10,000, and wherein a difference between the second melting point of the second acid-modified polypropylene and the melting point of a cast polypropylene resin constituting at least an inner layer of an external packaging material of the non-aqueous electrolyte battery is from 0° C. to 10° C.