| 摘要 |
PROBLEM TO BE SOLVED: To provide a gasket having high accuracy, to improve its workability in processing it, and also adapt it for high volume production by forming it from a molding of a high-polymer film and by integrating the high-polymer film with a metal case of a positive electrode. SOLUTION: When this gasket is manufactured, firstly, a layered product composed by laminating a high-polymer film and metal foil each formed into an annular shape by drilling a hole in the central part is cut down into the same concentric shape as and larger than the hole and thereafter molded. Thereby, or by forming it into the same concentric outline as and larger than the hole, then molding it and thereafter cutting down along the outline, the gasket integrated with a metal case of a positive electrode can be manufactured. In this case, a crystalline high-polymer having a melting point of 150 deg.C or above, or an amorphous high-polymer having a glass transition temperature of 150 deg.C or above is used for the high-polymer film used as the gasket material, for instance, polypropylene or polyphenylene sulfide is particularly preferable in view of electrolyte resistance (chemical resistance) and a hygroscopic characteristic.
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