Patent ID: 8786256

Claim:
A battery system, comprising: a unit battery cell assembly including a plurality of unit battery cells that are electrically connected in series and each include a plurality of battery cells that are electrically connected in series; a plurality of integrated circuits that are provided to respectively correspond to the plurality of unit battery cells, each detect voltages of a plurality of battery cells of a corresponding unit battery cell, and each adjust a state of charge of each of the plurality of battery cells, wherein: each of the plurality of integrated circuits includes a plurality of voltage terminals that are provided to be used to electrically connect with terminals of the plurality of battery cells of the corresponding unit battery cell, a voltage detection unit that detects terminal-to-terminal voltages of the plurality of battery cells of the corresponding unit battery cell that are taken in from the plurality of voltage terminals, a plurality of state-of-charge-adjust terminals that are provided to be used to adjust a state of charge of each of the plurality of battery cells of the corresponding unit battery cell, a plurality of switches that are respectively and electrically connected with the plurality of state-of-charge-adjust terminals, and each form a discharge circuit that adjusts a state of charge of each of the plurality of battery cells of the corresponding unit battery cell, a driving unit that drives each of the plurality of switches, a communication unit that inputs/outputs a signal, a signal input terminal that is provided to be used to input a signal to the communication unit, a signal output terminal that is provided to be used to output a signal from the communication unit, a temperature detection unit that detects a temperature of an integrated circuit, and a temperature abnormality detection unit that detects whether or not the temperature detected by the temperature detection unit exceeds a preset temperature; and the temperature abnormality detection unit stops driving of the plurality of switches when the temperature abnormality detection unit detects that the detected temperature exceeds the preset temperature.