Anti-swell protection circuit for battery cells

Details Anti-swell protection circuit for battery cells Anti-swell protection circuit for battery cells

2007-09-20

2010-11-09

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

C320S134000

Reexamination Certificate

active

07830125

ABSTRACT:
The present invention provides a protection circuit and method for preventing a battery from swelling in one embodiment. The protection circuit includes: a voltage monitoring circuit that monitors a voltage across the battery; a control circuit that receives voltage information from the voltage monitoring circuit; and a discharge circuit that turns on to discharge the battery upon receiving a signal from the control circuit. The control circuit includes: a timer that sets predetermined time periods; a signaling section that outputs the signal to the discharge circuit after a first predetermined time period if the voltage stays above a first predetermined voltage threshold without charging or discharging to a load for the first predetermined time period; a sleep mode applying section that applies a sleep mode when the voltage falls below a second predetermined voltage threshold; and a load disconnecting section that disconnects the load if a wake-up command is not issued during the sleep mode for a third predetermined time period. Alternatively, the protection circuit may include a swell monitoring device that monitors a swell associated with the battery; a control circuit that receives swell information from the swell monitoring device; and a discharge circuit that turns on to discharge the battery upon receiving a signal from the control circuit.

REFERENCES:
patent: 4871553 (1989-10-01), Huhndorff
patent: 2006/0267545 (2006-11-01), Lee et al.

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