Safety device for use in secondary battery

Details Safety device for use in secondary battery Safety device for use in secondary battery

1996-10-08

1998-06-16

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

With control means responsive to battery condition sensing...

Temperature control

429 56, H01M 1050

Patent

active

057667934

ABSTRACT:
A safety device for a battery which can prevent explosion of the battery due to overcharging or shortcircuiting. In the safety device, a current flows through generating unit, lead, terminal of a conductor case, PTC plate, annular terminal, contact to electrode lid. A disk spring, generally called a bimetal, is adapted to bend backward when it is heated to a predetermined temperature. If the generating unit heats up by producing gas due to overcharging or shortcircuiting, the disk spring is heated. When heated to a predetermined temperature, it will bend backward, while pushing up a moving piece, which in turn pushing up the contact, thus separating the contact from the annular terminal. The current-flow path in the battery is thus cut, so that the generating unit will not heat up any further.

REFERENCES:
patent: 4035552 (1977-07-01), Epstein
patent: 4966822 (1990-10-01), Johnston
patent: 5567539 (1996-10-01), Takahashi et al.
Search Report from European Patent Office Jan. 1997.

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