Management device, a communication device, the management method and management system,

A via a power line connected to the battery cell, is obtained from a communication apparatus connected to a power line electrically, on the basis of the information related to the battery cells, the processing unit that performs processing related to the management of battery cells provided, information related to the battery cell includes a sensor information indicating the detection result of the sensor for detecting the state of the battery cell is detected, the processing unit performs a process corresponding to the detection result of the sensor, the management device is provided. .FIELD 1