Cell voltage detecting device for combination battery
First Claim
1. A unit cell voltage detecting device for a combination battery consisting of a plurality of unit cells connected in series, the plurality of unit cells being divided into several cell groups, the unit cell voltage detecting device comprising:
- a plurality of voltage divider circuits each connected to each unit cell, the voltage divider circuit having at least a cell-side resistor connected to a plus terminal of the unit cell and a reference-side resistor connected in series to the cell-side resistor;
a plurality of reference potential lines, each connecting a common terminal representing a lowest potential of each cell group to the reference-side resistors of that cell group; and
a cell voltage detector for detecting a cell voltage of each unit cell, a high potential side of the cell voltage detector being connected to a junction of the cell-side resistor and the reference-side resistor for receiving a divided potential therefrom, a low potential side of the cell voltage detector being connected to the reference potential line for receiving a reference potential therefrom, wherein;
each unit cell voltage is detected based on a potential difference between the divided potential and the reference potential.
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Abstract
A device for detecting a voltage of an individual unit cell included in a combination battery consisting of a number of unit cells connected in series. The unit cells are divided into several groups, and a voltage divider circuit having a cell-side resistor and a reference-side resistor is connected to each unit cell. A divided potential of each unit cell is supplied to a cell voltage detector from each voltage divider circuit. Also, a reference potential that is common to a cell group is supplied to the detector from a junction connecting two neighboring cell groups. The cell voltage detector determines the voltage of each unit cell, group by group, based on a difference between the divided potential and the reference potential. Since the reference potential is common to all the voltage divider circuits in one cell group, the voltage divider circuits can be simplified. To further simplify the circuits, the reference-side resistors for the first cell group are commonly used as the reference-side resistors for other cell groups.
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Citations
18 Claims
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1. A unit cell voltage detecting device for a combination battery consisting of a plurality of unit cells connected in series, the plurality of unit cells being divided into several cell groups, the unit cell voltage detecting device comprising:
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a plurality of voltage divider circuits each connected to each unit cell, the voltage divider circuit having at least a cell-side resistor connected to a plus terminal of the unit cell and a reference-side resistor connected in series to the cell-side resistor; a plurality of reference potential lines, each connecting a common terminal representing a lowest potential of each cell group to the reference-side resistors of that cell group; and a cell voltage detector for detecting a cell voltage of each unit cell, a high potential side of the cell voltage detector being connected to a junction of the cell-side resistor and the reference-side resistor for receiving a divided potential therefrom, a low potential side of the cell voltage detector being connected to the reference potential line for receiving a reference potential therefrom, wherein; each unit cell voltage is detected based on a potential difference between the divided potential and the reference potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification