Battery system monitoring apparatus
First Claim
1. A battery system monitoring apparatus for a battery system having a cell group having a plurality of unit cells connected in series, the battery system monitoring apparatus comprising:
- a first control device that is disposed in correspondence with the cell group;
a plurality of voltage detection lines that are disposed to connect a positive electrode and a negative electrode of each unit cell of the unit cells to the first control device, and input an inter-terminal voltage of each unit cell of the unit cells to the first control device;
a first resistor disposed in series with each of the voltage detection lines;
a first capacitor connected to each of the voltage detection lines; and
a balancing discharge circuit disposed in correspondence with each unit cell of the unit cells and discharging said each unit cell when said each unit cell is discharged,wherein the first capacitor is connected between the voltage detection lines in a position between the first resistor and the first control device, and the first capacitor is connected to a part which is a lowest-level potential of the cell group on a side opposite to a side connected to the voltage detection line,wherein the balancing discharge circuit includes a balancing switch turned on or off when the unit cell is discharged, and a second resistor connected in series with the balancing switch, andwherein the balancing discharge circuit is connected to the voltage detection line connected to the positive electrode of the unit cell and the voltage detection line connected to the negative electrode of the unit cell in a position on a side of the cell group with respect to the first resistor.
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Accused Products
Abstract
A battery system monitoring apparatus that monitors a battery system is provided having a cell group having a plurality of unit cells connected in series, including: a first control device that controls the cell group; and a plurality of voltage detection lines that connect positive electrodes and negative electrodes of the unit cells to the first control device, for measuring inter-terminal voltages of the unit cells. The first control device includes a balancing switch connected between the voltage detection line connected to the positive electrode of each unit cell and the voltage detection line connected to the negative electrode thereof for conducting balancing discharge of the unit cell, for each of the unit cells. A first resistor is disposed in series with each of the voltage detection lines, a first capacitor is connected between the voltage detection line, and a GND which is a lowest-level potential of the cell group.
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Citations
22 Claims
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1. A battery system monitoring apparatus for a battery system having a cell group having a plurality of unit cells connected in series, the battery system monitoring apparatus comprising:
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a first control device that is disposed in correspondence with the cell group; a plurality of voltage detection lines that are disposed to connect a positive electrode and a negative electrode of each unit cell of the unit cells to the first control device, and input an inter-terminal voltage of each unit cell of the unit cells to the first control device; a first resistor disposed in series with each of the voltage detection lines; a first capacitor connected to each of the voltage detection lines; and a balancing discharge circuit disposed in correspondence with each unit cell of the unit cells and discharging said each unit cell when said each unit cell is discharged, wherein the first capacitor is connected between the voltage detection lines in a position between the first resistor and the first control device, and the first capacitor is connected to a part which is a lowest-level potential of the cell group on a side opposite to a side connected to the voltage detection line, wherein the balancing discharge circuit includes a balancing switch turned on or off when the unit cell is discharged, and a second resistor connected in series with the balancing switch, and wherein the balancing discharge circuit is connected to the voltage detection line connected to the positive electrode of the unit cell and the voltage detection line connected to the negative electrode of the unit cell in a position on a side of the cell group with respect to the first resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A battery system monitoring apparatus for a battery system having a cell group having a plurality of unit cells connected in series, the battery system monitoring apparatus comprising:
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a first control device that is disposed in correspondence with the cell group; a plurality of voltage detection lines that are disposed to connect a positive electrode and a negative electrode of each unit cell of the unit cells to the first control device, and input an inter-terminal voltage of each unit cell of the unit cells to the first control device; and a power supply line that applies the inter-terminal voltage of the cell group to the first control device, wherein the first control device includes; a power supply unit; a voltage input unit that inputs the inter-terminal voltage of the cell group; a voltage measurement unit that measures the voltage; and a selection unit that selects an output from the inter-terminal voltage input unit, and inputs the output to the voltage measurement unit, wherein the power supply line is connected to the positive electrode of a highest-level unit cell of the cell group, wherein the inter-terminal voltage of the cell group is input to the power supply unit through the power supply line, and wherein the power supply unit includes an energization switch that applies the inter-terminal voltage of the cell group to the voltage input unit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A battery system monitoring apparatus for a battery system having a cell group having a plurality of unit cells connected in series, the battery system monitoring apparatus comprising:
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a first control device that is disposed in correspondence with the cell group and measures an inter-terminal voltage of each unit cell of the unit cells; a second control device that is disposed in correspondence with the cell group and controls discharge of the unit cells when charge states between the unit cells are balanced; a plurality of voltage detection lines that connect a positive electrode and a negative electrode of each unit cell of the unit cells to the first control device, and are disposed to input the inter-terminal voltage of each unit cell of the unit cells to the first control device; a first resistor disposed in series with each of the voltage detection lines; a first capacitor connected to the positive electrode and the negative electrode of each unit cell of the unit cells; a plurality of balancing lines branched from the respective voltage detection lines and connected to the second control device; a second resistor connected in series with each of the balancing lines; a second capacitor connected between the balancing lines branched from the voltage detection lines connected, respectively, to the positive electrode and the negative electrode of each unit cell of the unit cells; and a balancing switch that is disposed in correspondence with each unit cell of the unit cells, connected between the balancing lines branched from the voltage detection lines connected, respectively, to the positive electrode and the negative electrode of each unit cell of the unit cells, and turned on or off when said each unit cell is discharged, wherein the first capacitor is connected to the voltage detection lines in a position between the first resistor and the first control device, and wherein the second capacitor is connected to the balancing lines in a position between the second resistor and the second control device. - View Dependent Claims (21, 22)
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Specification