Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells
Patent
1997-07-25
1999-09-14
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
320122, 320162, H02J 700
Patent
active
059528150
ABSTRACT:
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.
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Comte Christophe
Hagen Ronald A.
Knudson Orlin B.
Morin Andre
Ross Guy
Hydro-Quebec Corporation
Minnesota Mining & Manufacturing Co.
Toatley , Jr. Gregory J.
Wong Peter S.
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