05952815 is referenced by 103 patents and cites 208 patents.

An apparatus and method for regulating the charge voltage of a number of electrochemical cells connected in series is disclosed. Equalization circuitry is provided to control the amount of charge current supplied to individual electrochemical cells included within the series string of electrochemical cells without interrupting the flow of charge current through the series string. The equalization circuitry balances the potential of each of the electrochemical cells to within a pre-determined voltage setpoint tolerance during charging, and, if necessary, prior to initiating charging. Equalization of cell potentials may be effected toward the end of a charge cycle or throughout the charge cycle. Overcharge protection is also provided for each of the electrochemical cells coupled to the series connection. During a discharge mode of operation in accordance with one embodiment, the equalization circuitry is substantially non-conductive with respect to the flow of discharge current from the series string of electrochemical cells. In accordance with another embodiment, equalization of the series string of cells is effected during a discharge cycle.

Title
Equalizer system and method for series connected energy storing devices
Application Number
8/900607
Publication Number
5952815
Application Date
July 25, 1997
Publication Date
September 14, 1999
Inventor
Guy Ross
Beloeil
CA
Andre Morin
Longueuil
CA
Orlin B Knudson
Vadnais Heights
MN, US
Ronald A Hagen
Stillwater
MN, US
Christophe Comte
Montreal
CA
Jean Rouillard
Saint-Luc
CA
Agent
Mueting Raasch & Gebhardt P A
Assignee
Hydro Quebec Corporation
CA
Minnesota Mining & Manufacturing Co
MN, US
IPC
H02J 7/00
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