Patent attributes
A storage battery deterioration measurement device and a power storage system are provided which measure deterioration in unit batteries included in an assembled battery constituting a storage battery in a shorter time than conventional devices and systems, and which include a control unit to acquire information based on the states of the multiple unit batteries and a deterioration determination unit to detect the unit battery indicating the maximum value among the information acquired by the control unit and the unit battery indicating the minimum value thereamong, and to detect deterioration in the unit batteries on the basis of the difference between a per-predetermined-period variation of information on the unit battery indicating the maximum value and a per-predetermined-period variation of information on the unit battery indicating the minimum value.