BATTERY MONITORING SYSTEM PROVIDED WITH BATTERY MONITORING CONTROL CIRCUIT FOR REDUCING CONSUMPTION POWER IN SLEEP STATE

A battery control system is provided with battery monitoring control circuits for measuring an output voltage of an individual or secondary battery cells, which are connected in an assembled battery divided into blocks; and a control circuit for controlling the battery monitoring control circuits. Each of the batter monitoring control circuits includes a communication interface for communications between the battery monitoring control circuits or communications with the control circuit; a power converter for converting a start-up signal into a DC voltage; and a start-up circuit that receives the DC voltage and generates a start-up control signal for starting the battery monitoring control circuit. The communication interface is a daisy-chain communication interface that connects the plurality of battery monitoring control circuits in a daisy chain, and one of the plurality of battery monitoring control circuits starts another one of the plurality of battery monitoring control circuits based on the start-up signal.