| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery pack in which a plurality of unit batteries are housed in a hermetically-sealed inner space, and the housed unit batteries can be efficiently cooled.SOLUTION: An insertion hole 17 communicating an inner space 13 with an outer space at an outside of the case 12 is formed in a case 12, and a rotary shaft 21a of a motor 21 is arranged in the insertion hole 17 so as to be inserted into the insertion hole. Since the motor 21 drives an inner fan 23 arranged in the inner space 13 of the case 12, air in the inner space 13 is circulated by the inner fan 23 to cool down each cell 11. Further, since the rotary shaft 21a is arranged so as to be inserted into the insertion hole 17, an external fan 22 can be provided in the rotary shaft 21a protruded from the case 12 to the exterior. Thereby, the fans can be provided outside the case 12 as well as inside the case 12, and the cells 11 can be cooled from the outside of the case 12, using one motor 21. |
