Battery pack

The embodiment of the utility model relates to a battery pack. The battery pack comprises a box body, a mounting beam, a battery module and a reinforcing beam, the at least two mounting beams are arranged in the box body at intervals in the length direction of the box body. A battery module is arranged between every two adjacent mounting beams and located on the faces, away from the bottom wall of the box body, of the mounting beams. A reinforcing beam is arranged on the face, away from the bottom wall of the box body, of at least one mounting beam, and part of the battery modules are clamped between the mounting beams and the reinforcing beam. And the reinforcing beams, the battery modules and the mounting beams are connected into a whole through penetrating fasteners. A battery module is arranged on a mounting beam in a box body, a reinforcing beam is arranged on one surface, far away from the inner bottom wall of the box body, of the mounting beam, part of the battery module is clamped between the mounting