Battery pack and electric device

The invention discloses a battery pack and an electric device, and belongs to the field of power batteries. The battery pack comprises a box body which is provided with an accommodating cavity; the first expansion beam is arranged in the accommodating cavity and divides the box body into a first space and a second space; the plurality of batteries are arranged in the first space at intervals; the first expansion plate is arranged in the first space; the first expansion plate is connected with the first expansion beam and faces the battery; the first expansion plate is used for abutting against the battery when the battery expands. The first expansion plate is arranged between the battery and the first expansion beam, so that partial expansion force generated by the battery can be dispersed, the direct action of the expansion force on the first expansion beam is buffered, the effect of reducing mechanical stress concentration is achieved, the limiting effect of the first expansion beam is improved, and the use