Electricity: battery or capacitor charging or discharging – Battery or cell discharging – Regulated discharging
Patent
1997-06-03
1999-02-02
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
Regulated discharging
H01M 1046
Patent
active
058670084
ABSTRACT:
A self-contained, rechargeable battery pack uses a coulomb-counting control circuit to measure charge received by and taken from the cells and to store a current charge status of those cells. The control circuit controls a charge/discharge pass transistor in the pack to provide overcharge protection. An always-on trickle charge resistor insures that the controller is in operation during charging even when the cells associated with the controller are completely discharged. A Schottky diode is placed across the charge/discharge pass transistor in order to minimize the discharge dropoff voltage between the terminal of the cell and a corresponding external terminal. The present invention considerably lengthens the useful life of nickel-based rechargeable batteries, as measured in terms of both the number of cycles and the available capacity per cycle, while requiring no extra terminals.
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Bachner, III Edward F.
Du Xin
Double-Time Battery Corporation
Perkins Jefferson
Tso Edward H.
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