Battery pack box body, battery pack and electric automobile

The utility model belongs to the technical field of batteries, and discloses a battery pack box body, a battery pack and an electric automobile. The battery pack box body comprises a frame, a first rivet nut, a liquid cooling plate and a first bolt piece. A mounting cavity capable of accommodating a battery is defined by the frame, and the frame is provided with a boss part protruding towards the mounting cavity; the first rivet nut is arranged on the boss part in a penetrating mode, the deformation section of the first rivet nut can be subjected to rivet pulling deformation and protrudes in the circumferential direction to form a first outer protrusion capable of abutting against the boss part, a first limiting table is arranged in the circumferential direction of the first rivet nut, and the first limiting table abuts against the boss part; the liquid cooling plate is arranged below the boss part; the first bolt piece penetrates through the liquid cooling plate and is in threaded connection with the first r