Patent ID: 7974095

Claim:
A power source apparatus comprising: a power source module which includes a plurality of cylindrical power source elements each having a length direction, the plurality of cylindrical power source elements are arranged in parallel, and the plurality of cylindrical power source elements are arranged in parallel in a direction perpendicular to a length direction of the power source module; a case which houses the power source module and a cooling liquid; and a cross flow fan which is placed in the case in a state in which the cross flow fan is immersed in the cooling liquid together with the power source module, wherein the cross flow fan includes a rotation axis which is arranged in parallel to the length direction of the cylindrical power source elements and at least one blade that rotates about the rotation axis, the blade having a width at least substantially the same as a length of the cylindrical power source elements and extending in an axial direction of the rotation axis, and an outlet of a laminar flow of the cooling liquid, which is formed by rotating the blade, and flows out of the cross flow fan, is located in a space between the power source module and the case and faces toward the direction arranged in parallel to the plurality of cylindrical power source elements, the laminar flow having a width at least substantially the same as the length of the cylindrical power source elements.