| 摘要 |
PROBLEM TO BE SOLVED: To securely inhibit wasteful power consumption of a battery pack even in an abnormal operation state. SOLUTION: A power supply system for vehicle is provided with the battery pack 1 where a plurality of battery cells 3 are connected in series, a cell controller 4 connected to a battery block 2 obtained by dividing the battery pack 1 into a plurality of blocks and a main controller 5 outputting a signal to each cell controller 4 at prescribed timing. A power supply circuit 8 of the cell controller 4 supplies power from the battery block 2. A power supply circuit 9 of the main controller 5 supplies power from an in-vehicle battery 15. The power supply circuit 8 of each cell controller 4 is provided with a switching function 14 which changes over power supplied from the battery block 2 to a low power consumption state and a control circuit 13 controlling the switching function 14. The control circuit 13 detects a non-input state where a signal is not inputted from the main controller 5 at setting time, switches the switching function 14 to the low power consumption state and reduces power consumption of the battery pack 1. COPYRIGHT: (C)2009,JPO&INPIT
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