Patent ID: 6495284
Filing Date: 2002-12-17
Classification: H01M,Y02E

Abstract:
In an alkaline electrochemical cell, said cell having an open ended cylindrical cell housing and an end seal assembly inserted therein closing said housing, said cell having a positive and a negative terminal, said end seal assembly comprising an electrically insulating sealing disk having a rupturable membrane therein, said insulating sealing disk having an elongated electrically conductive current collector passing therethrough, said insulating sealing disk sealing the open end of said housing and providing electrical insulation between said current collector and said housing, and the edge of said housing being crimped over the peripheral edge of said insulating sealing disk to form a cell shoulder along the line of crimp, the improvement comprising:the end seal assembly comprising an insulating sealing disk comprising an integral central boss, wherein a portion of said boss protrudes from the housing open end, an elongated current collector penetrating through said boss, wherein a portion of said current collector protrudes from said boss and forms said negative terminal, wherein at least a portion of said insulating sealing disk lies within said cell housing, wherein the raised central boss has a width which is at least about 60% the diameter of the cell housing.