| 摘要 |
A storage battery system includes: a secondary battery; a holding member comprising a flow channel of a cooling medium for cooling the secondary battery, which holds the secondary battery; a medium temperature measuring unit that measures temperatures T1 and T2 of the cooling medium at two locations in the flow channel; a battery temperature measuring unit that measures a temperature T3 of the secondary battery; and a judging unit that repetitively calculates a coefficient α and that judges a cooling performance of the secondary battery based on a variation of the coefficient α, the coefficient α being defined as (T3−T1)/(T2−T1), (T3−T2)/(T2−T1), or (T3−T2)/(T3−T1).
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