Using the body as the battery case may increase or decrease the electric vehicle battery system

The present invention relates to an electric vehicle battery system may increase or decrease as a vehicle using the battery housing, comprising a cell pack (100), the main control box (200), connected to the harness (300), a lower floor (400) , the upper floor, the vehicle body (600), the sealing plate (700), wherein: the cell pack (100) is connected by a bolt (108) and a lower body (600), the main control box (200) by a bolt (108) connected to the lower body (600), a lower floor (400) and a lower body (600) are welded together, is relatively fixed, the cell pack connector (301) is mounted threadedly coupled to the lower floor (400 on), the main control box connector (303) is coupled by a screw mounted on a lower floor (400), according to the present invention, the lower housing body as the battery case is the theoretical design of the vehicle more reasonable stiffness and strength; present invention, a plurality of unit cells forming a battery pack system, the requirements of the cell pack mounting structure and the structure itself are reduced.