Method for charging batteries

Details Method for charging batteries Method for charging batteries

1999-11-02

2000-10-17

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With thermal condition detection

320137, H02J 704

Patent

active

061337137

ABSTRACT:
A method for charging and monitoring a rechargeable battery is proposed. The charging method includes charging a rechargeable battery, sensing temperature of said battery, and calculating temperature change rate. The method further includes sensing voltage of said battery after the temperature change rate reaches a predetermined value, calculating voltage change rate, and reducing current sent to the battery when the voltage change rate reaches a predetermined value. A second embodiment of the charging method may include charging a rechargeable battery, sensing temperature and voltage of said battery, and calculating temperature and voltage change rates. The method further includes sensing for a maximum voltage change rate after the temperature change rate reaches a predetermined value, and reducing current sent to the battery when the maximum voltage change rate is sensed. In addition, the method may include sensing for a minimum voltage change rate before sensing for the maximum change rate, wherein sensing for the maximum change rate would begin after the temperature change rate reaches a predetermined value or after the minimum voltage change rate is sensed.

REFERENCES:
patent: 5345163 (1994-09-01), Gibbons et al.
patent: 5583871 (1996-12-01), Simmonds et al.
patent: 5627451 (1997-05-01), Takeda
patent: 5900718 (1999-05-01), Tsenter
patent: 6008628 (1999-12-01), Brotto

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