SECONDARY BATTERY INTERNAL STATE ESTIMATING APPARATUS AND SECONDARY BATTERY INTERNAL STATE ESTIMATING METHOD

摘要

By using a battery model capable of estimating the internal reaction of a secondary battery (10) according to parameter values a battery model section (60) supplies the parameter values acquired from a parameter generating section (62) to the battery model to estimate the internal state of the secondary battery (10). The parameter generating section (62) generates the parameter values including the material property value of the secondary battery (10) according to information indicating the usage state of the secondary battery (10). The battery model is updated by updating the parameter values. This reduces the difference between the actual internal state of the secondary battery and the internal state of the secondary battery estimated by the battery model.