Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...
Patent
1998-08-25
2000-10-17
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Cell enclosure structure, e.g., housing, casing, container,...
429181, 429178, 429 57, 296231, H01M 0208
Patent
active
061329002
ABSTRACT:
The present invention relates to a construction of an explosion-proof safety vent for small-size non-aqueous electrolyte batteries such as prismatic lithium-ion secondary batteries or with an oval cross section hence with a small area of seal plate, and to a method of producing a seal plate. It aims at securing safety of a battery by allowing an explosion-proof vent to operate without fail with a simple construction at no sacrifice of the capacity. In order to fulfill this aim, it provides an explosion-proof safety vent wherein upper peripheral edge of an opening of a bottomed cell container made of metal and the periphery of a seal plate made of metal are hermetically sealed by laser welding, a rivet serving as a terminal is inserted in a through hole provided on the central portion of the seal plate and hermetically fixed by crimping via a gasket, an exhaust hole is provided between the terminal and the periphery of the seal plate, and the exhaust hole is closed by a metal foil. With such a simple structure, it allows the vent to operate without fail to prevent accident and also proposes a method of continuously producing seal plates in the form of a hoop.
REFERENCES:
patent: 4658795 (1987-04-01), Yamaura et al.
patent: 5344724 (1994-09-01), Ozaki et al.
patent: 5665483 (1997-09-01), Saito et al.
patent: 5672443 (1997-09-01), Salisbury et al.
patent: 6004692 (1999-12-01), Muffoletto et al.
Japanese search report for Int'l Appln. No. PCT/JP97/04679 dated Mar. 24, 1998.
Fujii Takabumi
Haraguchi Kazunori
Iida Mamoru
Matsumasa Yoshitaka
Mizuno Kenji
Alejandro Raymond
Matsushita Electric - Industrial Co., Ltd.
Nuzzolillo Maria
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