Zener diode looping element for protecting a battery cell

Details Zener diode looping element for protecting a battery cell Zener diode looping element for protecting a battery cell

H - Electricity

02

H

320/11, 317/12.9

H02H 7/18 (2006.01) H01M 10/42 (2006.01) H02J 7/00 (2006.01) H01M 2/34 (2006.01) H01M 6/50 (2006.01) H01M 10/39 (2006.01)

Patent

CA 1266298

ZENER DIODE LOOPING ELEMENT FOR PROTECTING A BATTERY CELL ABSTRACT OF THE DISCLOSURE A special zener diode is disclosed which is shunted across each cell in a series connected string of battery cells. In response to a cell failure which causes a cell ho open circuit, all battery current is routed through the zener diode looping element. This current causes a permanent state change of the looping element thereby causing the looping element to become a permanent short circuit. Thereby, the failed cell is effectively removed from the circuit. Another embodiment is disclosed whereby the zener diodes are used to ensure uniform full charge among all of the cells in the battery. The zener diodes are chosen to have a breakdown voltage slightly higher than the optimal maximum battery voltage. A special charger is used which lowers the charging rate when the zener breakdown voltage is approached, so that the zener will not be destroyed from excess current during charging.

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