Battery management system with energy balance among multiple battery cells
First Claim
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1. A battery management circuit, comprising:
- a plurality of battery cells coupled in series, each battery cell having a parameter; and
a magnetic device comprising a plurality of windings and operable for performing the steps of;
selecting, from the plurality of battery cells, a first battery cell whose parameter has a value larger than values of the parameters of multiple battery cells in the plurality of battery cells, the first battery cell having a first terminal coupled to a polarity-marked terminal of a first winding of the plurality of windings;
selecting, from the plurality of battery cells, a second battery cell that has a second terminal coupled to a polarity-marked terminal of a second winding of the plurality of windings, the second terminal having a polarity different from the first terminal of the first battery cell;
storing energy transferred from the first battery cell via the first winding; and
releasing the stored energy to the second battery cell via the second winding,whereinthe first winding is coupled in parallel with each battery cell of the plurality of battery cells via a plurality of switches,the second winding is coupled in parallel with each battery cell of the plurality of battery cells via the plurality of switches,the parameter of the first battery cell has a maximal value in values of the parameters of the plurality of battery cells, andthe parameter of the second battery cell has a minimal value in the values of the parameters of the plurality of battery cells.
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Abstract
A battery circuit including a first battery cell with a first parameter having a first value and a second battery cell with a second parameter having a second value. The second battery cell is coupled to the first battery cell in series. The battery circuit further includes a magnetic device operable for storing energy transferred from the first battery cell via a first winding coupled to the first battery cell and for releasing the stored energy to the second battery cell via a second winding coupled to the second battery cell if the first value of the first parameter is greater than the second value of the second parameter.
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Citations
12 Claims
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1. A battery management circuit, comprising:
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a plurality of battery cells coupled in series, each battery cell having a parameter; and a magnetic device comprising a plurality of windings and operable for performing the steps of; selecting, from the plurality of battery cells, a first battery cell whose parameter has a value larger than values of the parameters of multiple battery cells in the plurality of battery cells, the first battery cell having a first terminal coupled to a polarity-marked terminal of a first winding of the plurality of windings; selecting, from the plurality of battery cells, a second battery cell that has a second terminal coupled to a polarity-marked terminal of a second winding of the plurality of windings, the second terminal having a polarity different from the first terminal of the first battery cell; storing energy transferred from the first battery cell via the first winding; and releasing the stored energy to the second battery cell via the second winding, wherein the first winding is coupled in parallel with each battery cell of the plurality of battery cells via a plurality of switches, the second winding is coupled in parallel with each battery cell of the plurality of battery cells via the plurality of switches, the parameter of the first battery cell has a maximal value in values of the parameters of the plurality of battery cells, and the parameter of the second battery cell has a minimal value in the values of the parameters of the plurality of battery cells. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery management system for managing a battery pack including a plurality of battery cells, comprising:
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a magnetic device comprising a plurality of windings wiring around a magnetic core; a plurality of switches, each switch coupled between a battery cell and a winding; and a controlling unit coupled to the switches and operable for performing the steps of; detecting a parameter of each battery cell of the plurality of battery cells; selecting, from the plurality of battery cells, a first battery cell and a second battery cell, wherein the parameter of the first battery cell has a value larger than values of the parameters of multiple battery cells in the plurality of battery cells, and wherein the parameter of the second battery cell has a value smaller than the values of the parameters of the multiple battery cells in the plurality of battery cells; selecting, from the plurality of battery cells, a charged battery cell whose terminal, which is coupled to a polarity-marked terminal of a winding corresponding to the charged battery cell, has a polarity different from a first terminal, which is coupled to a polarity-marked terminal of a winding corresponding to the first battery cell, of the first battery cell; turning on respective switches coupled to the charged battery cell and the first battery cell alternately to balance the charged battery cell and the first battery cell; selecting, from the plurality of battery cells, a discharged battery cell whose terminal, which is coupled to a polarity-marked terminal of a winding corresponding to the discharged battery cell, has a polarity different from a second terminal, which is coupled to a polarity-marked terminal of a winding corresponding to the second battery cell, of the second battery cell; and turning on respective switches coupled to the discharged battery cell and the second battery cell alternately to balance the discharged battery cell and the second battery cell, wherein the plurality of windings comprises a first winding and a second winding, wherein the first winding is coupled in parallel with each battery cell of the plurality of battery cells via the plurality of switches, and wherein the second winding is coupled in parallel with each battery cell of the plurality of battery cells via the plurality of switches. - View Dependent Claims (9, 10, 11)
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12. A battery management system for managing a battery pack including a plurality of battery cells, comprising:
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a magnetic device comprising a plurality of windings wiring around a magnetic core; a plurality of switches, each switch coupled between a battery cell and a winding; and a controlling unit coupled to the switches and operable for performing the steps of; detecting a parameter of each battery cell of the plurality of battery cells; selecting, from the plurality of battery cells, a first battery cell and a second battery cell, wherein the parameter of the first battery cell has a value larger than values of the parameters of multiple battery cells in the plurality of battery cells, and wherein the parameter of the second battery cell has a value smaller than the values of the parameters of the multiple battery cells in the plurality of battery cells; selecting, from the plurality of battery cells, a charged battery cell whose terminal, which is coupled to a polarity-marked terminal of a winding corresponding to the charged battery cell, has a polarity different from a first terminal, which is coupled to a polarity-marked terminal of a winding corresponding to the first battery cell, of the first battery cell; turning on respective switches coupled to the charged battery cell and the first battery cell alternately to balance the charged battery cell and the first battery cell; selecting, from the plurality of battery cells, a discharged battery cell whose terminal, which is coupled to a polarity-marked terminal of a winding corresponding to the discharged battery cell, has a polarity different from a second terminal, which is coupled to a polarity-marked terminal of a winding corresponding to the second battery cell, of the second battery cell; and turning on respective switches coupled to the discharged battery cell and the second battery cell alternately to balance the discharged battery cell and the second battery cell, wherein the controlling unit further performs the steps of; determining whether the first terminal of the first battery cell has different polarity from the second terminal of the second battery cell; turning on respective switches coupled to the first and second battery cells alternately to balance the first and second battery cells if the first terminal of the first battery cell has different polarity from the second terminal of the second battery cell, wherein the discharged battery cell is the first battery cell and the charged cell is the second battery cell; and performing the following steps if the first terminal of the first battery cell has the same polarity as the second terminal of the second battery cell; selecting a third battery cell whose parameter has a maximal value and a fourth battery cell whose parameter has a minimal value from a set of the battery cells whose terminals, which are coupled to polarity-marked terminals of corresponding windings, have different polarity from the first and second terminals; turning on respective switches coupled to the first battery cell and the fourth battery cell alternately to balance the first battery cell and the fourth battery cell; and turning on respective switches coupled to the third battery cell and the second battery cell alternately to balance the third battery cell and the second battery cell, wherein the discharged battery cell is the third battery cell and the charged cell is the fourth battery cell.
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Specification