BATTERY MODULE, BATTERY PACK, AND VEHICLE

This application provides a battery module, a battery pack, and a vehicle. The battery module includes batteries, a first end plate, and a second end plate. A first lug portion of the first end plate is provided with a first mounting hole. A second lug portion of the second end plate is provided with a second mounting hole. An area of a lower surface of the first lug portion is S1, a distance from a central axis of the first mounting hole to a center line of the battery module is d1, an area of a lower surface of the second lug portion is S2, and a distance from a central axis of the second mounting hole to the center line of the battery module is d2, where d1 > d2, and S1 < S2 . Because d1 > d2, jointing assembly between battery modules is achieved. Moreover, to ensure a stress balance between different fastening points, a stress F1 at the fastening point corresponding to the first mounting hole is less than a stress F2 at the fastening point corresponding to the second mounting hole. Because F1 < F2 and S1 < S2 , a difference between P1 and P2 is reduced, thereby preventing structural strength of the first lug portion or the second lug portion from being over-designed. This increases energy density of the battery pack, and ensures fastening reliability between the battery modules and a box body.