VOLTAGE EQUALIZATION APPARATUS AND METHOD FOR BATTERY SYSTEM
First Claim
1. A voltage equalization apparatus for a battery system with more than two serial cells, comprising:
- a mutual inductor or a transformer, comprising a primary winding, a magnetic core and a plurality of secondary windings;
a first switch, connected in series with the primary winding, wherein the first switch and the primary winding are connected in parallel with the battery system;
a plurality of second switches, respectively connected in series with the secondary windings, wherein the second switches and the secondary windings are connected in parallel with the cells; and
a voltage equalization control circuit, configured to;
test voltage of each cell in the battery system and control turning off and turning on of the first switch and second switches; and
when the battery system is charged, turn on a second switch in parallel with a cell of highest voltage, and after a first preset time turn off the second switch with the cell of highest voltage and turn on the first switch.
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Accused Products
Abstract
The present invention provides a voltage equalization apparatus and method for a battery system. The apparatus includes: a mutual inductor or a transformer, which includes a primary winding, a magnetic core and multiple secondary windings; a first switch, connected in series with the primary winding, wherein the first switch and the primary winding are connected in parallel with the battery system; a plurality of second switches, respectively connected in series with the secondary windings, wherein the second switches and the secondary windings are connected in parallel with the cells; and a voltage equalization control circuit, configured to: test voltage of each cell in the battery system and control turning off and turning on of the first switch and second switches.
26 Citations
12 Claims
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1. A voltage equalization apparatus for a battery system with more than two serial cells, comprising:
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a mutual inductor or a transformer, comprising a primary winding, a magnetic core and a plurality of secondary windings; a first switch, connected in series with the primary winding, wherein the first switch and the primary winding are connected in parallel with the battery system; a plurality of second switches, respectively connected in series with the secondary windings, wherein the second switches and the secondary windings are connected in parallel with the cells; and a voltage equalization control circuit, configured to;
test voltage of each cell in the battery system and control turning off and turning on of the first switch and second switches; and
when the battery system is charged, turn on a second switch in parallel with a cell of highest voltage, and after a first preset time turn off the second switch with the cell of highest voltage and turn on the first switch. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A voltage equalization apparatus for a battery system with more than two serial cells, comprising:
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a mutual inductor or a transformer, comprising a primary winding, a magnetic core and a plurality of secondary windings; a first switch, connected in series with the primary winding, wherein the first switch and the primary winding are connected in parallel with the battery system; a plurality of second switches, respectively connected in series with the secondary windings, wherein the second switches and the secondary windings are connected in parallel with the cells; and a voltage equalization control circuit, configured to;
test voltage of each cell in the battery system and control turning off and turning on of the first switch and second switches; and
when the battery system is discharged, turn on the first switch, and after a second preset time turn off the first switch and turn on a second switch in parallel with a cell of lowest voltage. - View Dependent Claims (9, 10)
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11. A voltage equalization method for a battery system with more than two serial cells, comprising:
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judging whether the battery system is charged or discharged; testing voltage of each cell in the battery system; and when the battery system is charged, turning on a second switch in parallel with a cell of highest voltage, and turning off the second switch in parallel with a cell of highest voltage and turning on a first switch in parallel with the battery system after the second switch in parallel with a cell of highest voltage is on for a first preset time;
or when the battery system is discharged, turning on the first switch in parallel with the battery system; and
turning off the first switch and turning on the second switch in parallel with a cell of lowest voltage after the first switch is on for a second preset time;wherein second switches are respectively connected in series with secondary windings of a mutual inductor or a transformer, and the second switches and the secondary windings are connected in parallel with the cells. - View Dependent Claims (12)
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Specification