Safety device for enclosed cell

Details Safety device for enclosed cell Safety device for enclosed cell

1996-07-23

1997-10-14

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Means externally releasing internal gas pressure from closed...

Blowout type

429164, 429175, 429 58, H01M 212

Patent

active

056770766

ABSTRACT:
In a safety device for an enclosed cell, a closure anti-explosion valve 1 of a flat metal sheet which is deformable upon a pressure rise inside the cell has a valve body dent 9 formed in the center and protruding toward an inner cover 3, the surrounding wall of the dent 9 is partly reduced in thickness to form a thin-walled portion 1a around the dent, and the dent portion is joined to the inner cover 3 having gas inlet holes 3a at a weld 1c. Preferably, the surface of the closure anti-explosion valve 1 has a plurality of valve body thin-walled portions 1b radially extending from the dent 9. Also preferably, nicks 8 are formed on the upper or under side of the flat sheet part of the closure anti-explosion valve, among the valve body thin-walled portions 1b.

REFERENCES:
patent: Re23427 (1951-10-01), Ruben
patent: 4174166 (1979-11-01), Rosansky
patent: 4601959 (1986-07-01), Romero
patent: 4698282 (1987-10-01), Mantello
patent: 4971867 (1990-11-01), Watanabe et al.
Ubakawa, "Patent Abstracts of Japan", vol. 18, No. 540, E-1616, abstract 6-196139 Oct. 1994.

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