Fail safe circuit and battery pack using same

Details Fail safe circuit and battery pack using same Fail safe circuit and battery pack using same

1998-04-02

2000-04-04

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320164, H02J 700, H02H 320

Patent

active

060465751

ABSTRACT:
A battery pack (102) comprises a lithium battery cell or cells (112), and is charged by a charger (104). In the event of a failure in the charger, an over-voltage protection circuit (120, 122) normally prevents charging of the battery cell above an over-voltage limit. In the event of a failure in both the charger and the over-voltage protection circuit, a critical voltage protection circuit (124, 126, 128) is provided to render the battery inoperative in a fail safe state. Specifically, a critical voltage control circuit (128) senses the battery voltage reaching the critical voltage level and responds by closing a current shunt switch (126), which draws current from the battery cell or cells through a fuse (124), causing the fuse to open, thus rendering the battery pack inoperative in a fail safe state.

REFERENCES:
patent: 4215306 (1980-07-01), Mase
patent: 4320333 (1982-03-01), Hase
patent: 4399396 (1983-08-01), Hase
patent: 4563628 (1986-01-01), Tietz et al.
patent: 5691619 (1997-11-01), Vingsbo

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