Battery pack capacity learn algorithm
First Claim
1. A method for determining a capacity of battery cells in a battery pack, said method comprising:
- providing a current state-of-charge for each battery cell in the battery pack for a current time frame and a previous state-of-charge for each battery cell in the battery pack for a previous time frame;
subtracting the current state-of-charge from the previous state-of-charge for each battery cell to generate a cell delta state-of-charge for each cell;
providing an average cell delta state-of-charge for the cell delta state-of-charges from all of the cells;
dividing each cell delta state-of-charge by the average cell delta state-of-charge to provide a relative cell delta state-of-charge for each cell; and
dividing, using a microprocessor, the current state-of-charge for each cell by the relative cell delta state-of-charge for that cell to generate a capacity adjusted state-of-charge that identifies the capacity of the cell.
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Abstract
A method that considers battery capacity for providing cell balancing for battery cells in a battery pack. The method includes providing a current state-of-charge for each battery cell in the battery pack for a current time frame and a previous state-of-charge for each battery cell in the battery pack from a previous time frame. The method also includes subtracting the current state-of-charge from the previous state-of-charge for each battery cell to generate a cell delta state-of-charge for each cell and providing an average cell delta state-of-charge of the cell delta state-of-charges for all of the cells. The method also includes dividing each cell delta state-of-charge by the average cell delta state-of-charge to provide a relative cell delta state-of-charge for each cell and dividing the current state-of-charge by the relative cell delta state-of-charge for that cell to generate a capacity adjustment state-of-charge that identifies the capacity of the cell.
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Citations
20 Claims
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1. A method for determining a capacity of battery cells in a battery pack, said method comprising:
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providing a current state-of-charge for each battery cell in the battery pack for a current time frame and a previous state-of-charge for each battery cell in the battery pack for a previous time frame; subtracting the current state-of-charge from the previous state-of-charge for each battery cell to generate a cell delta state-of-charge for each cell; providing an average cell delta state-of-charge for the cell delta state-of-charges from all of the cells; dividing each cell delta state-of-charge by the average cell delta state-of-charge to provide a relative cell delta state-of-charge for each cell; and dividing, using a microprocessor, the current state-of-charge for each cell by the relative cell delta state-of-charge for that cell to generate a capacity adjusted state-of-charge that identifies the capacity of the cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining a capacity of battery cells in a battery pack in an electric vehicle, said method comprising:
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providing a current state-of-charge for each battery cell in the battery pack for a current time frame and a previous state-of-charge for each battery cell in the battery pack for a previous time frame; subtracting the current state-of-charge from the previous state-of-charge for each battery cell to generate a cell delta state-of-charge for each cell; providing an average cell delta state-of-charge for the cell delta state-of-charges from all of the cells; dividing each cell delta state-of-charge by the average cell delta state-of-charge to provide a relative cell delta state-of-charge for each cell; dividing the current state-of-charge for each cell by the relative cell delta state-of-charge for that cell to generate a capacity adjusted state-of-charge that identifies the capacity of the cell; generating a capacity fade factor that identifies the age of the battery pack; and using the capacity adjusted state-of-charge for each cell and the capacity fade factor in a cell balancing algorithm that balances the state-of-charge of each cell in the battery pack to be about the same. - View Dependent Claims (10, 11, 12)
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13. A system for determining a capacity of battery cells in a battery pack, said system comprising;
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means for providing a current state-of-charge for each battery cell in the battery pack for a current time frame and means for providing a previous state-of-charge for each battery cell in the battery pack for a previous time frame; means for subtracting the current state-of-charge from the previous state-of-charge for each battery cell to generate a cell delta state-of-charge for each cell; means for providing an average cell delta state-of-charge for the cell delta state-of-charges from all the cells; means for dividing each cell delta state-of-charge by the average cell delta state-of-charge to provide a relative cell delta state-of-charge for each cell; and means for dividing the current state-of-charge from each cell by the relative cell delta state-of-charge for that cell to determine a capacity adjusted state-of-charge that identifies the capacity of the cell. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification