Circuit and method for detection of battery cell drain
First Claim
1. A battery management system comprising:
- at least one controller programmed to, in response to a magnitude of a difference between an average cell state of charge at a start of a battery rest period and at least one of a plurality of cell states of charge estimated at predetermined intervals during the battery rest period being greater than a predetermined value, output a drained cell diagnostic indicator.
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Abstract
A vehicle includes a traction battery and a battery management system. The battery management system includes a controller programmed to output a drained cell diagnostic indicator. The drained cell diagnostic indicator is based on a magnitude of a difference between an average cell state of charge at a start of a battery rest period and a cell state of charge estimated at predetermined intervals during the battery rest period being greater than a predetermined value. A response to the drained cell diagnostic indicator depends on the magnitude of the cell drain rate and may include operating the traction battery at a reduced power level and notifying an operator of the diagnostic condition.
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Citations
19 Claims
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1. A battery management system comprising:
at least one controller programmed to, in response to a magnitude of a difference between an average cell state of charge at a start of a battery rest period and at least one of a plurality of cell states of charge estimated at predetermined intervals during the battery rest period being greater than a predetermined value, output a drained cell diagnostic indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle comprising:
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a traction battery including a plurality of cells; and at least one controller programmed to reduce a maximum power requested from the traction battery by a predetermined percentage in response to a cell drain rate that is based on a cell state of charge at a start of a battery rest period and cell states of charge at predetermined intervals during the battery rest period being greater than a redetermined rate. - View Dependent Claims (11, 12, 13, 14)
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15. A method of operating a traction battery comprising:
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outputting, by a controller, a drained cell diagnostic in response to a cell state of charge estimated at predetermined intervals during a battery rest period being outside of a predetermined range about an average cell state of charge computed at a start of the battery rest period; and operating, by the controller, the traction battery according to the drained cell diagnostic and a cell drain rate. - View Dependent Claims (16, 17, 18, 19)
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Specification