| abstract |
PROBLEM TO BE SOLVED: To estimate deterioration due to wear among deterioration states of a secondary battery. An estimation device for estimating a deterioration state of a secondary battery (10), comprising a controller (30) for estimating a deterioration amount due to wear of the secondary battery in the deterioration state. The controller estimates the amount of deterioration using an estimation formula based on the Arrhenius equation, which increases the amount of deterioration over time. In addition, when the controller learns the deterioration amount in a state where the salt concentration bias in the secondary battery is eliminated, the controller estimates the deterioration amount using an estimation formula based on the learned deterioration amount. [Selection] Figure 1 |