SECONDARY BATTERY EVALUATION SYSTEM

A secondary battery evaluation system includes a battery pack including a plurality of secondary battery cells, a voltage detection circuit that detects a terminal-to-terminal voltage value of the battery pack, a current detection circuit that detects a current value of the battery pack, a test secondary battery including at least one battery cell manufactured from the same material as the secondary battery cell, and a test power supply circuit that controls charge and discharge of the test secondary battery. The test power supply circuit sets a test charge voltage value and a test charge current value for the test secondary battery based on a terminal-to-terminal voltage value and a current value during charging of the battery pack, charges the test secondary battery with the test charge voltage value and the test charge current value, sets a test discharge voltage value and a test discharge current value for the test secondary battery based on a terminal-to-terminal voltage value and a current value during discharging of the battery pack, and discharges the test secondary battery with the test discharge voltage value and the test discharge current value to perform a simulation of charge and discharge of the battery pack. The test power supply circuit acquires SOC-OCV data of the test secondary battery by performing charge and discharge of the test secondary battery independently of driving of the battery pack at the time of measurement of SOC-OCV data.