Patent ID: 9340122
Filing Date: 2016-05-17
CPC Classification: B60L,G01R,H01M,H02J,Y02E,Y02T

Claim Text:
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, 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.