Patent ID: 7410722

Claim:
A battery pack, comprising: a plurality of batteries each having ends, side faces, a top surface and connection terminals on the top surface; and a plurality of holding frames each having end sides opposed to the battery ends, a top side opposed to the top surface of the battery and side faces opposed to the side faces of the battery, wherein each holding frame is capable of accommodating and holding one of the batteries so as to provide spaces between the battery and the holding frame, said spaces including spaces between one side face of the battery and one of the holding frame side faces, spaces between an outside of the ends of the battery and the opposing end sides of the holding frame, and spaces between the top surface of the battery and the top side of the holding frame extending from each connection terminal to the nearest end side of the holding frame, wherein the top side of the holding frame is located above the connection terminals with respect to an axis drawn from the top surface of the battery to the top side of the holding frame, the holding frame side faces that are opposed to each other having openings, wherein the holding frames are set in an arrangement with the holding frame openings aligned, ends of the arrangement being the holding frame side faces that are not opposed to another holding frame side face, wherein at both of the ends of the arrangement end plates are joined together with the holding frames, the holding frames and the end plates forming an outer case for accommodating the plurality of batteries and for forming a cooling space around each battery.