Equalization device, equalization processing program, battery system, electric vehicle and equalization processing method
First Claim
1. An equalization device arranged to perform equalization processing of charge states of a plurality of battery cells that are connected in series, whereinsaid plurality of battery cells are divided into a plurality of groups,said equalization device comprising:
- a detector arranged to detect the charge states of said plurality of battery cells;
a selector arranged to select any of said plurality of groups based on the charge states detected by said detector; and
an equalization processing unit arranged to perform the equalization processing by selectively causing the battery cells that belong to the group selected by said selector to discharge such that the battery cells that belong to different groups are discharged at different time points.
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Abstract
A battery ECU acquires open circuit voltages of a plurality of battery cells that are divided into a plurality of groups A, B, C using a plurality of detecting units, and calculates SOCs of the battery cells based on the open circuit voltages. Then, the battery ECU selects the group to which the battery cell having the largest SOC among the SOCs of the plurality of battery cells belongs, and selects the battery cell to be discharged in the selected group. A series circuit composed of a resistor and a switching element is connected in parallel with each battery cell. The battery ECU turns on the switching element corresponding to the selected battery cell. At this time, the battery cell is connected to the resistor, thus being discharged.
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Citations
10 Claims
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1. An equalization device arranged to perform equalization processing of charge states of a plurality of battery cells that are connected in series, wherein
said plurality of battery cells are divided into a plurality of groups, said equalization device comprising: -
a detector arranged to detect the charge states of said plurality of battery cells; a selector arranged to select any of said plurality of groups based on the charge states detected by said detector; and an equalization processing unit arranged to perform the equalization processing by selectively causing the battery cells that belong to the group selected by said selector to discharge such that the battery cells that belong to different groups are discharged at different time points. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9)
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7. An equalization processing program that is executable by a computer for performing equalization processing of charge states of a plurality of battery cells that are connected in series and divided into a plurality of groups, causing said computer to execute the processes of:
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acquiring the charge states of said plurality of battery cells; selecting any of said plurality of groups based on the acquired charge states; and performing the equalization processing by selectively causing the battery cells that belong to the selected group to discharge such that the battery cells that belong to different groups are discharged at different time points.
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10. An equalization processing method for performing equalization processing of charge states of a plurality of battery cells that are connected in series and divided into a plurality of groups, comprising the steps of:
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acquiring the charge states of said plurality of battery cells; selecting any of said plurality of groups based on the acquired charge states; and performing the equalization processing by selectively causing the battery cells that belong to the selected group to discharge such that the battery cells that belong to different groups are discharged at different time points.
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Specification