Air tightness detection device for lower box body of battery pack

The utility model discloses an airtight detection device for a lower box body of a battery pack. The airtight detection device comprises a U-shaped clamping unit, a rack, a driving cylinder unit, a supporting plate assembly, a U-shaped pressing unit and a control system, the clamping units are installed on the rack, the pressing units are installed on the rack, the driving air cylinder unit is installed at the bottom of the rack, the control system is fixed to the rack, and a pipeline of the control system is connected with the driving air cylinder unit. According to the technical scheme, horizontal limiting is achieved through cooperation of the supporting plate guiding mechanism and the rack limiting mechanism, vertical limiting is achieved through the gravity center of the pressing plate, the lower box body and the rubber strip are clamped and do not loosen through the self-locking function of the U-shaped clamp, and the sealing contact effect of the supporting plate and the lower box body is good through