Title:
ZENER DIODE DIVICE FOR FORMING CLOSED CIRCUIT FOR BATTERY PROTECTION
Document Type and Number:
Japanese Patent JPS62221826
Kind Code:
A
Abstract:
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 to 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.
Inventors:
MORII ARUTOMEIDO
Application Number:
JP28689686A
Publication Date:
September 29, 1987
Filing Date:
December 03, 1986
Export Citation:
Assignee:
PAWAAPURETSUKUSU TECHNOL INC
International Classes:
H01M10/39; H01M10/42; H01M10/44; H01M50/583; H02H7/18; H02J7/00; H01M6/50; (IPC1-7): H01M10/39; H01M10/42; H01M10/44; H02J7/00
Attorney, Agent or Firm:
Aoki Akira