Method for balancing the voltage of battery cells
AssigneeVolvo Truck Corporation
InventorsTobias Smidebrant, Jerker Lennevi
Life of this patent
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Abstract
A method is provided for balancing the voltage of multiple series-connected electrochemical cells of an electrical storage system of a hybrid electric vehicle. The method includes discharging the electrical storage system by operating at least one large electrical machine of the vehicle at vehicle standstill until the state of charge of the electrical storage system or the cell having the lowest state of charge has reached a predetermined level, and subsequently balancing the voltage of the cells.
Claims23
A method for balancing the voltage of multiple series-connected electrochemical cells of an electrical storage system of a hybrid electric vehicle comprising discharging the electrical storage system by operating at least one electrical machine of the vehicle at vehicle standstill until the state of charge of the electrical storage system or the cell having, the lowest state of charge has reached a predetermined level, and subsequently balancing the voltage of the cells.
A computer comprising a program for performing all the steps of a method for balancing the voltage of multiple series-connected electrochemical cells of an electrical storage system of a hybrid electric vehicle comprising discharging the electrical storage system by operating at least one electrical machine of the vehicle at vehicle standstill until the state of charge of the electrical storage system or the cell having the lowest state of charge has reached a predetermined level, and subsequently balancing the voltage of the cells when program is run on the computer.
A computer program product comprising a program stored on a non-transitory computer readable medium for performing all the steps of a method for balancing the voltage of multiple series-connected electrochemical cells of an electrical storage system of a hybrid electric vehicle comprising discharging the electrical storage system by operating at least one electrical machine of the vehicle at vehicle standstill until the state of charge of the electrical storage system or the cell having the lowest state of charge has reached a predetermined level, and subsequently balancing the voltage of the cells when the program is run on a computer.
A computer system for implementing a method for balancing the voltage of multiple series-connected electrochemical cells of an electrical storage system of a hybrid electric vehicle, the method comprising discharging the electrical storage system by operating at least one electrical machine of the vehicle at vehicle standstill until the state of charge of the electrical storage system or the cell having the lowest state of charge has reached a predetermined level, and subsequently balancing the voltage of the cells.
A hybrid electric vehicle comprising an electrical storage system comprising multiple series-connected electrochemical cells and a battery management unit (23), wherein the battery management unit is configured to balance the voltage of the multiple series-connected electrochemical cells of the electrical storage system wherein the battery management unit is configured to discharge the electrical storage system by operating at least one electrical machine of the vehicle at vehicle standstill until the state of charge of the electrical storage system or the cell having the lowest state of charge has reached a predetermined level, and subsequently to balance the voltage of the cells.
Dependencies are inferred from the claim text.