BATTERY SAFETY EVALUATION APPARATUS, BATTERY CONTROL APPARATUS, BATTERY SAFETY EVALUATION METHOD, SAFETY EVALUATION PROGRAM, CONTROL CIRCUIT, AND POWER STORAGE SYSTEM

摘要

A battery safety evaluation apparatus as an aspect of the present invention includes a battery characteristic estimator and a battery swelling index calculator.　The battery characteristic estimator estimates an estimation value of an inner state parameter of a first battery to be evaluated on the basis of data of voltage and current of the first battery measured in charging or discharging the first battery.　The battery swelling index calculator calculates a safety index regarding swelling risk of the first battery on the basis of first reference data. The first battery is a secondary battery.　The first reference data is reference data considered to correspond to the first battery from the reference data on the basis of estimation value of the inner state parameter.　The reference data indicates at least one of relationships between a positive electrode capacity, a negative electrode capacity and an SOC deviation of a secondary battery.