| 摘要 |
A battery pack that allows a cover to be firmly fixed with a simple structure and that has superior impact resistance is provided. The battery pack is a battery pack 1 in which a protection circuit 10 and a protection element 7 are attached to a unit cell 2 and the protection circuit 10 and the protection element 7 are housed within a cover 11, the battery pack 1 including an internal frame 6 provided within the cover 11, wherein the internal frame 6 is fixed to the unit cell 2 and supports the protection circuit 10, a boss 13 projecting from the internal frame 6 which passes through a hole 12 formed in the cover 11, and the cover 11 is fixed to the internal frame 6 by melting and deforming the boss 13.
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