Charge equalization between series-connected battery cells
First Claim
Patent Images
1. A circuit comprising:
- a first set of one or more semiconductor switches coupled to a first node and a first terminal of an energy store configured to store energy;
a second set of one or more semiconductor switches coupled to a second node and a second terminal of the energy store, the first and second sets of semiconductor switches coupled to a first battery cell; and
the first battery cell coupled in series to a second battery cell, the second battery cell coupled to the first and second sets of semiconductor switches;
wherein the first and second sets of semiconductor switches are configured to;
discharge a first voltage of the first battery cell into the energy store; and
reverse a polarity of the first and second nodes to charge the second battery cell.
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Abstract
In one embodiment, a circuit comprising a first set of one or more semiconductor switches coupled to a first node and a first terminal of an energy store configured to store energy, and a second set of one or more semiconductor switches coupled to a second node and a second terminal of the energy store, each of the first and second sets of semiconductor switches being configured to couple to a terminal of a battery cell.
12 Citations
17 Claims
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1. A circuit comprising:
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a first set of one or more semiconductor switches coupled to a first node and a first terminal of an energy store configured to store energy; a second set of one or more semiconductor switches coupled to a second node and a second terminal of the energy store, the first and second sets of semiconductor switches coupled to a first battery cell; and the first battery cell coupled in series to a second battery cell, the second battery cell coupled to the first and second sets of semiconductor switches; wherein the first and second sets of semiconductor switches are configured to; discharge a first voltage of the first battery cell into the energy store; and reverse a polarity of the first and second nodes to charge the second battery cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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determining whether a first battery cell should be charged or discharged based on a first cell voltage of the first battery cell; if the first battery cell should be discharged, then; discharging a first voltage of the first battery cell into an energy store by; controlling a first set of one or more semiconductor switches coupled to the energy store at a first node; controlling a second set of one or more semiconductor switches coupled to the energy store at a second node; selecting a second battery cell to charge based on a second cell voltage of the second battery cell; and reversing a polarity of the first and second nodes to charge the second battery cell by controlling the first and second sets of semiconductor switches; and if the first battery cell should be charged, then; selecting the second battery cell to discharge based on the second cell voltage of the second battery cell; discharging a second voltage of the second battery cell into the energy store by controlling the first and second sets of semiconductor switches; and reversing the polarity of the first and second nodes to charge the first battery cell by controlling the first and second sets of semiconductor switches. - View Dependent Claims (10)
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11. A system comprising:
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a first set of one or more semiconductor switches coupled to a first node and a first terminal of an energy store configured to store energy; a second set of one or more semiconductor switches coupled to a second node and a second terminal of the energy store, each of the first and second sets of semiconductor switches being configured to couple to a terminal of a first battery cell and a second battery cell; the first battery cell coupled in series to the second battery cell; and a controller coupled to the first and second sets of semiconductor switches, the controller configured to; control a first switched connection by regulating the first set of semiconductor switches; control a second switched connection by regulating the second set of semiconductor switches; discharge a first voltage of the first battery cell into the energy store by controlling the first and second sets of semiconductor switches; and reverse a polarity of the first and second nodes to charge the second battery cell by controlling the first and second sets of semiconductor switches. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification