Protective device for secondary batteries

Details Protective device for secondary batteries Protective device for secondary batteries

1997-10-29

2000-05-09

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

With nonbattery electrical component electrically connected...

429 62, 429 90, 320134, 320154, H01M 1400, H01M 1046

Patent

active

06060185&

ABSTRACT:
The invention provides a protective device for batteries having a high energy density such as lithium ion batteries. The protective device comprises a battery voltage-monitoring means, an overcharge-detecting means for sending out a charge-finishing signal when a voltage detected by the battery voltage-detecting means is higher than a preset value, a charge-finishing means for finishing charge in response to the charge-finishing signal, an output-counting means for counting the number of charge-finishing signals sent out of the charge-finishing means, and a cutoff means for cutting off conduction of a current in said batteries when a counted value reaches a preset value, thereby limiting the number of permissible overcharging cycles.

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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