DEVICE FOR ESTIMATING DEGREE OF BATTERY DEGRADATION, AND ESTIMATION METHOD

The battery deterioration degree estimating apparatus includes the storage deterioration degree estimator that estimates the storage deterioration degree of the battery in reuse on the basis of the information on the storage deterioration degree of the battery in the in-vehicle period and the load information of the battery in reuse, the cycle deterioration degree estimator that estimates the cycle deterioration degree of the battery in reuse on the basis of the load information of the battery in reuse, and the total-deterioration-degree at secondary-use-start calculator that calculates the total deterioration degree of the battery at the time point of reuse start. The battery deterioration degree estimating apparatus includes the total-deterioration-degree detector that estimates the total deterioration degree of the battery after the reuse start on the basis of the storage deterioration degree in reuse, the cycle deterioration degree in reuse, and the total deterioration degree of the battery at the time point of the reuse start.