Patent ID: 8843333
Filing Date: 2014-09-23
Classification: B60L,G01R,H01M,Y02E,Y02T

Abstract:
1. A nonaqueous electrolyte solution type lithium ion secondary battery system comprising: a discharge amount obtaining portion that obtains a determination zone discharge amount that is a discharge amount when a nonaqueous electrolyte solution type lithium ion secondary battery is discharged from a predetermined determination start voltage until a predetermined determination end voltage; an internal resistance obtaining portion that obtains an internal resistance value of the nonaqueous electrolyte solution type lithium ion secondary battery; a correlation map in which a combination of internal resistance value information and determination zone discharge amount information for a battery, the battery being a battery in which lithium deposition has not occurred and that is a same kind of battery as a target battery that is the nonaqueous electrolyte solution type lithium ion secondary battery for which a determination is to be made, is stored for each degree of age-related deterioration of the battery in which lithium deposition has not occurred, wherein the age-related deterioration of the battery is an amount of deterioration that occurs due to the nonaqueous electrolyte solution type lithium ion secondary battery not being used; and a deposition determining portion that determines a degree of lithium deposition in the target battery by comparing the determination zone discharge amount obtained by the discharge amount obtaining portion when determining the degree of lithium deposition in the target battery with the internal resistance value obtained by the internal resistance obtaining portion when determining the degree of lithium deposition in the target battery on the same scale by converting at least one of the determination zone discharge amount and the internal resistance value via the correlation map.