| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that, when a lithium deposition amount is estimated with an assumption that a current distribution in a thickness direction of a negative electrode active material exhibits a constant current value, a deviation in the current distribution from the constant current value results in a deviation of an estimated lithium deposition amount from an actual lithium deposition amount.SOLUTION: A lithium deposition amount is the total amount of an active lithium amount at the time when a deposition reaction and a dissolution reaction are performed and an inactive lithium amount generated by an inactivation reaction. The active lithium amount is calculated on the basis of a reaction current calculated from a reaction overpotential in a deposition reaction and a dissolution reaction. The inactive lithium amount is calculated on the basis of a reaction current calculated from a reaction overpotential in an inactivation reaction. A current distribution is calculated on the basis of at least one of a current value, a temperature and an SOC of a lithium ion secondary battery. When a divergence value between the current distribution and an average value of the current distribution is equal to or more than a threshold value, a negative electrode potential used for the calculation of each reaction overpotential is corrected using a correction value according to the divergence value. |
