Management Device, Energy Storage Apparatus, System, and Communication Method

A battery management unit that manages an energy storage cell, the battery management unit including: a current sensor that measures a charge/discharge current in the energy storage cell; a first communication unit that communicates with a vehicle; and a management unit, in which the management unit executes: determination processing of detecting, by the current sensor, a pulse pattern occurring in the charge/discharge current in the energy storage cell, and determining whether or not the detected pulse pattern matches a predetermined pattern; and communication processing of communicating with the vehicle via the first communication unit when it is determined in the affirmative in the determination processing.