Lithium battery having an over-loading preventing device

Details Lithium battery having an over-loading preventing device Lithium battery having an over-loading preventing device

1996-07-24

1998-05-05

Willis, Jr., Prince

Chemistry: electrical current producing apparatus, product, and

Sealed cell having gas prevention or elimation means

Prevention means controlling an auxiliary device

429 57, 429 61, 429 62, H01M 204, H01M 212

Patent

active

057471878

ABSTRACT:
A lithium battery is provided which can promptly cut off current when it is being overheated by a short or the like, thereby preventing an explosion thereof. A shape-memory alloy spring made of a nickel-titanium alloy is included between the cover and the cap, either for making contact with both the cover and the cap, thereby electrically connecting the cover with the cap, or for separating from the cap in the case of an overheating of the battery, thereby electrically disconnecting the cover from the cap. A semi-spherical protrusion is formed at the center of the spring so as to make contact with the bottom of the cap, so that if the battery is overheated, the protrusion becomes flat, and is separated from the cap, thereby electrically disconnecting the cap from the cover. The semi-spherical protrusion of the shape-memory alloy spring repeatedly contracts and expands so as to prevent the overheating of the battery.

REFERENCES:
patent: 4855195 (1989-08-01), Georgopoulos et al.
patent: 4966822 (1990-10-01), Johnston
patent: 4975341 (1990-12-01), Tucholski et al.
patent: 4992339 (1991-02-01), Georgopoulos
patent: 5026615 (1991-06-01), Tucholski
patent: 5092901 (1992-03-01), Hunter et al.
patent: 5188909 (1993-02-01), Pedicini
patent: 5380606 (1995-01-01), Itou et al.
patent: 5418082 (1995-05-01), Taki et al.
Patent Abstracts of Japan, vol. 9, No. 65, Pub. No. JP 59203376, Mar. (1985).

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