Protection assembly, battery pack shell, battery pack and vehicle

The utility model provides a protection assembly, a battery pack shell, a battery pack and a vehicle. And the protection assembly is arranged on the bottom side of the battery pack bottom plate. The protection assembly comprises a body part and a spacing part. The body part comprises a buffer plate; the spacing part is suitable for being arranged on the side, facing the bottom plate, of the buffer plate so as to isolate the buffer plate from the bottom plate. According to the protection assembly provided by the utility model, the spacing part is arranged towards the to-be-protected object of the bottom plate, and the buffer plate and the bottom plate are separated through spacing of the spacing part, so that the bottom plate is prevented from being corroded by accumulated water of the buffer plate.