Ball nut, ball connector assembly and vehicle

The utility model relates to a car lamp connecting piece, and discloses a ball head nut which comprises a ball head nut body and a nut lock sleeve, the ball head nut body comprises a ball socket part and an installation part, the ball socket part comprises cantilever structures, a connecting column and a ball head base which are evenly distributed in the circumferential direction, and the installation part comprises a limiting flange edge and an installation foot. A plurality of mounting grooves are formed in the ball nut body, the nut lock sleeve is of a hollow cylinder structure, through grooves evenly distributed in the circumferential direction are formed in the circumferential face of the nut lock sleeve, a plurality of clamping feet are arranged on the end face of the inner side of the nut lock sleeve, the clamping feet correspond to the mounting grooves in a one-to-one mode, and the clamping feet are suitable for being clamped into the mounting grooves. The connecting columns and the mounting feet are