Protective device for secondary batteries

Details Protective device for secondary batteries Protective device for secondary batteries

1997-10-29

1998-12-29

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

With nonbattery electrical component electrically connected...

429 62, 429 90, 320150, H01M 1400

Patent

active

058539085

ABSTRACT:
The invention provides a protective device for batteries having a high energy density such as lithium ion batteries. The protective device includes a current conduction cutoff means having a current-conducting circuit comprising a voltage-detecting means for detecting the voltage of at least one battery being charged, a heat-generating resistance for starting the conduction of a current when the detected voltage exceeds a preset voltage, and a temperature fuse thermally coupled to the heat-generating resistance. When a state where battery voltage is higher than a preset value continues, a charging circuit for the battery is cut off by the temperature fuse and current output from the battery is disabled. The protective device further includes a battery-discharging means actuated upon detection of the fusing-down of the temperature fuse, so that the battery is disabled, and then placed in a dischargeable state.

REFERENCES:
patent: 5569550 (1996-10-01), Garrett et al.
patent: 5637413 (1997-06-01), Fernandez et al.
patent: 5645949 (1997-07-01), Young

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