Battery pack

The utility model relates to the technical field of batteries, in particular to a battery pack, which comprises a battery pack and a battery box body, the battery pack is accommodated in the battery box body and comprises a plurality of battery units and a plurality of heat exchange plates, and the plurality of battery units are arranged along a first direction; each battery unit is provided with a top surface, a bottom surface, two first side surfaces and two second side surfaces, the two first side surfaces and the two second side surfaces are arranged between the top surface and the bottom surface, the two first side surfaces are oppositely arranged, the two second side surfaces are oppositely arranged, the area of the first side surfaces is larger than that of the second side surfaces; two adjacent battery units share one heat exchange plate; wherein the battery box body comprises a bottom plate, the battery pack is supported on the bottom plate, and a plurality of cavities which are arranged at intervals