CELL-BALANCE DEVICE AND BATTERY SYSTEM

摘要

Provided are a cell-balance device and a battery system having high reliability. A cell-balance device comprises: a plurality of power storage unit connection terminals to which connection points between a plurality of power storage units connected in series, or both ends of each of the plurality of power storage units, are to be connected; a voltage holding device connection terminal to which a voltage holding device is to be connected; a plurality of first switch circuits provided between the plurality of power storage unit connection terminals and the voltage holding device; a reception terminal that receives a synchronization signal; a transmission terminal that transmits the synchronization signal; a control circuit that controls the on/off of the plurality of first switch circuits on the basis of the synchronization signal; and overcurrent detection circuits that detect overcurrent flowing through the first switch circuits.