Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1996-06-21
1998-06-09
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 17, 320 15, 320 13, H01M 1044
Patent
active
057640270
ABSTRACT:
In the embodiment of the present invention, a method for balancing charges of a plurality of batteries coupled in series includes determining actual or estimated rates of self-discharge of the batteries and individually shunting across one or more of the batteries to cause shunt currents which at least partially compensate for differences in the rates of self-discharge between batteries. In a second embodiment of the present invention, a method for balancing charges of a plurality of batteries coupled in series comprises measuring temperatures of the batteries and individually shunting across one or more of the batteries to cause shunt currents from those batteries which are functions of the temperatures of those batteries. A third embodiment of the present invention provides a method for balancing charges of a plurality of batteries coupled in series, the batteries furnished to store and provide energy for use in propelling an electrically-propelled vehicle. This method includes determining actual or relative states of charge of the batteries when the batteries are providing energy for propelling the electrically-propelled vehicle. The method also comprises individually shunting across one or more of the batteries when the batteries are providing energy for propelling the electrically-propelled vehicle, to generate shunt currents from those batteries.
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Ford Global Technologies Inc.
Shin K.
Sparschu Mark S.
Wong Peter S.
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