Maximum Energy transfer through cell isolation and discharge
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United States of America Patent
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Issued Date -
Sep 20, 2007
app pub date -
Sep 8, 2004
filing date -
Sep 8, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A battery system includes a multi-cell battery pack in electrical communication with a load. The voltages of each cell are individually monitored by the microcontroller, such as with a high-impedance input terminal. Across each of the cells is a transistor-resistor combination such that by providing a voltage to the gate of each of the transistors, a short-circuit is created through the corresponding cell thereby providing an additional current drain on the cell. More specifically, by turning on the transistor, a short-circuit current (I.sub.SQ1) is drawn from the cell through resistor (R1) to provide for the isolated discharge of the specific cell. By selectively measuring each of the cells in a multi-cell battery pack to determine if any of the cells are over-voltage, and if so, by increasing the current drain on that specific cell, the overall maximum amount of energy can be transferred to a load across the battery pack. Moreover, this selectively isolation and discharge provides a mechanism for maintaining a constant charge across all batteries in a multi-cell batter pack.
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