Balancing control device and in-vehicle power supply device

Abstract

Provided is a balancing control device capable of adjusting a threshold value later, said threshold value being used as a reference when balancing the cell voltages of a plurality of cells. The balancing control device (10) has: a voltage detection unit (40) for individually detecting the cell voltages of a plurality of cells (21, 22, 23, 24); individual discharging units (51, 52, 53, 54) for individually discharging the cells; a setting unit (64) for setting a threshold value in an updatable manner, said threshold value being a reference value to be compared with the cell voltages detected bythe voltage detection unit (40); and a control unit (62) for controlling the individual discharging units (51, 52, 53, 54). The control unit (62) compares each cell voltage detected by the voltage detection unit (40) with the threshold value set by the setting unit (64) and performs control so that a cell to be discharged, which has the cell voltage larger than the threshold value, is selectivelydischarged.

Description

technical field [0001] The present invention relates to an equalization control device and an in-vehicle power supply device. Background technique [0002] In a vehicle, a power storage device is mounted for use as a main power source, a backup power source, or the like. For example, electric double layer capacitors have high electrostatic capacitance and are also excellent in charge-discharge cycle characteristics, so they are used in batteries such as backup power supplies for vehicles. When such an electric double layer capacitor is used for the purpose of supplying a larger current, it is generally used as a module in which a plurality of electric double layer capacitor cells are connected in series. [0003] However, when charge and discharge are performed in such a module, the voltage between the terminals of the individual cells varies due to fluctuations in characteristics such as capacitance and leakage resistance of the individual cells. Therefore, for example, i...

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Problems solved by technology

[0003] However, when charging and discharging are performed in such a module, the voltage between the terminals of each unit cell varies due to characteristic fluctuations such as capacitance and leakage resistance of each unit cell.

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