| 摘要 |
[Problem] To make it possible to avoid mistakes of battery holders housed in outer cases so that cell packs can be assembled correctly. [Solution] An outer case (40) is provided with a case-side rib (48) protruding from the first position on the inner surface, and the battery holder (20) is provided with a holder side projection (28) protruding from the second position on the outer surface. The battery holder (20) is configured so that the second position, at which the holder-side projection (28) is provided, is located at a different position to that for a battery holder (20B) of a different type. The first and second positions are disposed at a position at which the case side rib (48) does not interfere with the holder side projection (28) when the battery holder (20) is inserted into the outer case (40), and the case side rib (48) interferes with the holder-side projection (28) when an attempt is made to insert the battery holder (20B) of a different type into the outer case (40). The first and second positions are disposed in symmetric positions on a predetermined axis of symmetry. |
