Patent ID: 8666687

Claim:
A battery pack control apparatus comprising: a first monitoring device connected to a first single battery cell of a battery pack to monitor a state of the first single battery cell; a second monitoring device connected to a second single battery cell of the battery pack to monitor a state of the second single battery cell; a third monitoring device connected to a third single battery cell of the battery pack to monitor a state of the third single battery cell; a battery pack control device that controls a battery capacity of the battery pack by producing a command signal; a first communication device having an electric insulating quality provided between the third monitoring device and the battery pack control device such that the third monitoring device receives the command signal from the battery pack control device through the first communication device; a second communication device having an electric insulating quality provided between the first monitoring device and the battery pack control device such that the second monitoring device receives the command signal from the battery pack control device through the third monitoring device, and the first monitoring device receives the command signal from the second monitoring device and the first monitoring device sends a detection signal to the battery pack control device through the second communication device; and a first electric power consuming device that consumes an amount of electric power at the single battery cell connected to the second monitoring device, the amount of electric power corresponding to a communication occurring at the second communication device, the first electric power consuming device including a pair of resistors that divide a voltage at a communication power supply terminal of the second monitoring device, the resistors being serially provided in a second signal line through which the second monitoring device communicates the command signal with respect to the third monitoring device, the second signal line extending between an output terminal of the third monitoring device and the communication power supply terminal of the second monitoring device, the second signal line including a connecting point between the resistors and further extending between the connecting point and an input terminal of the second monitoring device.