Storage battery management device and method for managing battery device

Abstract

A storage battery management device that manages a battery assembly in which a plurality of storage batteries are connected in series includes: a control unit; an activation switch; and a power supply activation circuit that turns on the activation switch when a logic state of the external activation signal becomes an activation logic and maintains the on-state of the activation switch as long as an activation maintenance signal is input. The control unit includes a line switch control unit, an activation maintenance control unit, and an OCV identifying unit. The line switch control unit turns on a line switch when the external activation signal becomes an activation logic. The activation maintenance control unit starts the output of the activation maintenance signals to the power supply activation circuit when the external activation signal becomes the activation logic. The OCV identifying unit acquires the change amount of the voltage of each storage battery at predetermined time intervals when the external activation signal becomes the stop logic, records the voltage of each storage battery as the OCV when the change amount of the voltage all becomes equal to or smaller than a predetermined change amount, and stops the output of the activation maintenance signal.