Patent ID: 6634649
Filing Date: 2003-10-21
Classification: B29C,B29L,H01M,Y02E,Y10S

Abstract:
A gasket comprising:a cylindrical portion whose lower portion is gradually increased in thickness towards the lower end thereof, having formed therein a hole open at the top and bottom thereof, the lower opening being larger than the upper one, and in which a current collector is to be inserted; a disc-shaped portion formed contiguously along the outer circumference of and concentrically with the cylindrical portion; a thin portion formed between the cylindrical and disc-shaped portions, concentrically with the cylindrical portion and in a position nearer to the bottom of the disc-shaped portion; and a peripheral portion formed contiguously along the outer circumference of the disc-shaped portion to have the axial-sectional shape of a curve; the cylindrical portion being formed to project at the lower end thereof downward from the bottom of the disc-shaped portion; the boundary between the cylindrical and thin portions being chamfered or curved; and the boundary between the disc-shaped and thin portion being formed like a generally vertical edge.