Battery cell state of charge balancing
AssigneeGM Global Technology Operations LLC
InventorAndrew C. BAUGHMAN
Life of this patent
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Abstract
Methods and systems for balancing a state of charge of cell units of a battery pack of a vehicle are provided. Voltage sensors each measure a first value of state of charge of respective cell units at a first time, and a second value of state of charge of the respective cell units at a second time that is subsequent to the first time. A current sensor measures a current of the battery pack. A controller is coupled to the voltage sensors and the current sensor. The controller balances the state of charge around a predetermined calibrated value using the first values of state of charge, the second values of state of charge, and the current.
Claims20
A method for balancing a state of charge of a plurality of cell units of a battery pack of a vehicle, the method comprising the steps of:
- determining a first value of state of charge for each of the plurality of cell units at a first time;
- determining a second value of state of charge for each of the plurality of cell units at a second time that is subsequent to the first time;
- determining a current of the battery pack between the first time and the second time;
- and
- balancing the state of charge around a predetermined calibrated value using the first values of state of charge, the second values of state of charge, and the current via a processor.
A program product for balancing a state of charge of a plurality of cell units of a battery pack of a vehicle, the program product comprising:
- a program configured to at least facilitate:
- determining a first value of state of charge for each of the plurality of cell units continuously at a first time;
- determining a second value of state of charge for each of the plurality of cell units at a second time that is subsequent to the first time;
- determining a current of the battery pack between the first time and the second time;
- and
- balancing the state of charge around a predetermined calibrated value using the first values of state of charge, the second values of state of charge, and the current;
- and
- a non-transitory computer readable storage medium storing the program.
A system for balancing a state of charge of a plurality of cell units of a battery pack of a vehicle, the system comprising:
- a plurality of voltage sensors, each of the plurality of voltage sensors configured to measure a first value of state of charge for each of the plurality of cell units at a first time and a second value of state of charge for each of the plurality of cell units at a second time that is subsequent to the first time;
- and
- a current sensor configured to measure a current of the battery pack;
- and
- a controller coupled to the plurality of voltage sensors and the current sensor and configured to balance the state of charge around a predetermined calibrated value using the first values of state of charge, the second values of state of charge, and the current.
Dependencies are inferred from the claim text.