LEAK-PROOF ALKALINE CELL AND ITS PRODUCTION

摘要

A leak-proof alkaline cell comprising a positive can, a negative cap having a turned-up portion, said cap being fitted at the open end of the positive can and a gasket provided between the positive can and the negative cap, the rim of the positive can being crimped inwardly so as to press the gasket to the negative cap, the negative cap being made of a metal plate laminated with a copper layer which is adapted to be contacted with a negative electrode active material mix and the copper layer also extending to the outer surface of the negative cap facing the gasket, characterized in that the copper layer is eliminated at the ultimate terminal edge of the turned-up portion.