Methods and apparatus for protecting battery cells from overchar

Details Methods and apparatus for protecting battery cells from overchar Methods and apparatus for protecting battery cells from overchar

1997-02-18

1997-12-30

Tso, Edward

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 30, 320 39, H01M 1046

Patent

active

057034630

ABSTRACT:
A method and apparatus for protecting at least one battery cell from overcharge utilizes a combination of at least one MOSFET switch and a separate fail-safe element such as a fuse or circuit breaker. The potential across the at least one battery cell is monitored to determine to determine whether a failure of the at the least one MOSFET switch has occurred, and in response to the determination of such a failure, a separate element such as a fuse is forced to open circuit to further disconnect the at least one battery cell from a charging current.

REFERENCES:
patent: 4467266 (1984-08-01), Ritchie
patent: 4563628 (1986-01-01), Tietz et al.
patent: 5315221 (1994-05-01), Corey
patent: 5469351 (1995-11-01), Masrur et al.
patent: 5526215 (1996-06-01), Higashijima et al.
patent: 5602460 (1997-02-01), Fernandez et al.
patent: 5637413 (1997-06-01), Fernandez et al.

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