Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Patent
1996-07-31
1998-03-17
Cummings, Scott
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
277 12, 2643289, H01M 208
Patent
active
057284849
ABSTRACT:
It is an object of the present invention to improve reliability of a battery cell by preventing residual stress in the ting of a sealing gasket so as to provide a sealing gasket which does not crack. The object is achieved by a sealing gasket for a battery cell produced by injecting molten resin into a cavity from a gate which corresponds to a tip of a resin injection nozzle of a metal mold, wherein a ring forming a body of the gasket has an inward protrusion projecting inwardly from an internal surface of the ring and the gate is operatively disposed at a part which corresponds to the inward protrusion. In the sealing gasket so-produced, residual stress is generated in the inward protrusion. Therefore, the strength of the ring does not deteriorate because of the effects of the residual stress and cracking of the gasket can be prevented.
REFERENCES:
patent: 2949635 (1960-08-01), Chiero
patent: 3550987 (1970-12-01), Dickey
patent: 4054630 (1977-10-01), Wang
patent: 4990739 (1991-02-01), Zaplatynsky
patent: 5370270 (1994-12-01), Adams et al.
patent: 5470219 (1995-11-01), Yokoyama et al.
Injection Molding Handbook, "Gates", p. 184.
Fujimoto Yukio
Oosaka Hiroshi
Yamaguchi Masayoshi
Cummings Scott
Sanyo Electric Co,. Ltd.
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