| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that the internal temperature of a secondary battery increases when it is charged and discharged, and thereby the secondary battery is used while being cooled because temperature rise affects the life characteristics, but when cooling the secondary battery randomly by using a cooler, electric power is wasted thus increasing the operation cost.SOLUTION: When the temperature rise rate of a battery at a certain battery temperature is larger than a first set value, a cooler for cooling a secondary battery is operated with a cooling capacity smaller than the full capacity, and the cooler is operated with full capacity when the temperature rise rate of a battery is higher than a second set value. Consequently, the operation cost is reduced without sacrificing the temperature life of the secondary battery. |
