Chemistry: electrical current producing apparatus – product – and – Sealed cell having gas prevention or elimation means – Prevention means controlling an auxiliary device
Patent
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.
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Chaney Carol
Daewoo Electronics Co. Ltd.
Willis Jr. Prince
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