Electric vehicle battery integrated middle floor assembly

The electric vehicle battery integrated middle floor assembly comprises a doorsill beam, a plurality of floor cross beams and a battery pack, a battery pack frame is connected to the lower portion of the doorsill beam, a battery pack upper cover is used as a vehicle body middle floor, the vehicle body middle floor does not need to be specially configured any more, and the vertical size of the structure and the weight of the structure are reduced. An energy absorption aluminum box is arranged in the doorsill beam, the energy absorption aluminum box is divided into a plurality of cavities through a reinforcing plate structure, a box body top plate and a box body bottom plate of a box body are in a wave shape and are thinned in a segmented mode from outside to inside, transverse partition plates of the reinforcing plate structure are thinned in a segmented mode from outside to inside, and the wave-shaped structure is used for guiding compression energy absorption. The structure which is gradually thinned in sect