ELECTRIC POWER SUPPLY SYSTEM

摘要

A battery system having a cooling liquid that undergoes heat exchange with a battery assembly is reduced in size. The battery system in which a battery assembly is contained in a battery box is characterized by including the cooling liquid that is contained in the battery box and that undergoes heat exchange with the battery assembly, and a circulation passageway and a circulation pump that introduce a cooling gas lighter in specific gravity than the cooling liquid into the cooling liquid. The cooling gas floating up in the cooling liquid stirs the cooling liquid. This stirring action increases the flow rate of the cooling liquid, and therefore makes it possible to obtain high cooling capability even in a construction that employs a small-size circulation pump.