| 摘要 |
PROBLEM TO BE SOLVED: To relax progress of deterioration of a plurality of batteries for use in a plurality of electric vehicles to extend service lives of the batteries, and to reduce the number of man-hours for replacement of unusable batteries.SOLUTION: At a time of charging a chargeable battery mounted in each electric vehicle 1, charging information on the battery as well as identification information on the battery is transmitted from each battery charger 2 to a server device 5 via each wireless communication device 3 and a communication network 4, and the server device 5 accumulates the charging information on each electric vehicle 1. The server device 5 estimates a deterioration degree of each battery on the basis of the number of times of charging, a full charge capacity or the like, compares the deterioration degree of each battery with those of the other batteries, creates a notification screen for urging replacement of batteries between the electric vehicles using the batteries between which a deterioration degree difference is equal to or larger than a predetermined threshold, and transmits the notification screen to a user's client device 6. A user replaces the batteries so that a plurality of electric vehicles 1 can be made uniform in battery deterioration while viewing the notification screen. |
