Cell controller and battery-monitoring device

A battery-monitoring device that monitors an assembled battery having a single cell group or a plurality of cell groups, each made up with a plurality of battery cells connected in series, comprising:

• a cell controller;
• a control unit that applies a startup voltage to the cell controller and is electrically connected to a battery via a first switch;
• a first timer unit that includes a passive element capable of accumulating/discharging electric energy;
• and
• a second timer unit communicatively coupled to the control unit and electrically coupled to the battery, wherein the second timer unit continuously receives power from the battery;
• wherein the cell controller:
• in response to receiving the startup voltage, adjusts charge levels of the plurality of battery cells during a time period through which the startup voltage remains equal to or greater than a predetermined voltage,
• receives an input signal input from a higher-order system, and
• in response to receiving the input signal, enters a low power consumption mode;
• wherein, in response to entering the low power consumption mode, the control unit:
• activates the first timer,
• issues a reset command for the second timer,
• does not apply the startup voltage equal to or greater than the predetermined voltage to the cell controller, and
• disconnects the control unit from the battery by opening the switch;
• wherein the first timer unit in response to the control unit entering the low power consumption mode:
• applies the startup voltage equal to or greater than the predetermined voltage to the cell controller for a predetermined length of time.