Patent ID: 8736229

Claim:
A battery control circuit configured to operate by receiving electric power supplied from an electric cell group including a plurality of electric cells, comprising: a voltage detection circuit configured to detect a voltage of each electric cell; a driving circuit configured to drive switches at least for performing balancing of the voltages or states of charge of the electric cells; a signal input circuit configured to receive an input signal; a signal output circuit configured to send an output signal; a power supply circuit having two modes: a normal mode and a low consumption mode whose current consumption or power consumption is smaller than the normal mode; and a low consumption condition change circuit configured to store a command value received by way of the signal input circuit and capable of changing a condition for causing the power supply circuit to shift from the normal mode to the low consumption mode according to the command value, wherein the low consumption condition change circuit stores a period of time as the command value, starts to measure an operation period in the normal mode, when the signal input circuit has not received any input signal for not less than a predetermined period of time or receives an input signal to give instruction to stop an operation of the battery control circuit, and causes the power supply circuit to shift from the normal mode to the low consumption mode when the measured period of time reaches the stored period of time.