To quickly and accurately control the temperature of an electricity accumulation means provided on a vehicle.
In the hybrid vehicle 10 provided with a battery 500, an ECU 100 executes battery warming-up control. At this time, when an engine cooling water temperature Tw is higher than a battery temperature Tbatt and the battery temperature Tbatt is lower than a determination reference value Tbattth set based on an action appropriate temperature range of the battery 500, a valve element position of a three-way valve 770 of the battery warming-up device 700 is controlled by a first valve element position and the feed of cooling water to a heat-accumulation vessel 730 is started. The heat-accumulation vessel 730 has a structure inflated according to internal pressure, is inflated by increasing an amount of cooling water and imparts heat in a state that the vessel contacts with an opposed battery cell 520. When the battery warming-up is not necessary, the feed of cooling water to the heat-accumulation vessel 730 is stopped, the heat-accumulation vessel 730 is left from the battery cell 520, and the impartment of unnecessary heat is prevented.
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Koji Yamamoto
Satoshi Nakamura