| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that a region where a deposition reaction is easily proceeded and a region where a deposition reaction is hardly proceeded are sometimes included on a surface of a negative electrode plate.SOLUTION: An active lithium amount (Q) at the time when a deposition reaction and a dissolution reaction are performed is calculated on the basis of a reaction current in the deposition reaction and the dissolution reaction. An inactive lithium amount (Q) is calculated on the basis of a reaction current in an inactivation reaction. The total of the active lithium amount and the inactive lithium amount is a lithium deposition amount (Q). In a salt concentration distribution on a surface of an electrode plate of a lithium ion secondary battery, a salt concentration within an allowable range including a minimum value is calculated on the basis of a rise amount of an internal resistance value due to a deviation of the salt concentration in the lithium ion secondary battery. Using the calculated salt concentration, parameters used for calculating each reaction current are calculated. The salt concentration within an allowable range including a minimum value is easy to limit a deposition reaction, so that the lithium deposition amount can be calculated by considering a condition limiting the deposition reaction. |
