Overcharge protection circuitry for rechargeable battery pack
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United States of America Patent
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-
Feb 2, 1999
Grant Date -
N/A
app pub date -
Jun 3, 1997
filing date -
Jun 5, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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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