| 摘要 |
A battery pack ( 2 ) has a cooling medium passage through which a cooling medium for cooling a rechargeable battery ( 1 ) contained in the battery pack flow inside the pack. Oscillating energy generated by a device to which the battery pack is installed is used as a force for making the cooling medium flow. As a result, electric power is not consumed for cooling and accordingly all the electric power can be used for driving the device. Thus, it is possible to drive the device for a longer period of time.
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