Stator assembly, motor and vehicle

The invention provides a stator assembly, a motor and a vehicle, relates to the technical field of vehicles, and aims to solve the problem that the size of the end part of a stator core winding is relatively long. The stator assembly comprises a stator core and a multi-phase winding surrounding the stator core, the stator core is provided with a plurality of stator slots in the circumferential direction of the stator core, each stator slot is provided with M slot layers arranged in the radial direction of the stator core, each phase winding comprises N branches connected in parallel, and each branch comprises a first coil segment and a second coil segment which are connected; each of the first coil section and the second coil section comprises Q winding parts and Q connecting sections, the Q winding parts are arranged along the circumferential direction of the stator core, and each connecting section is connected with two adjacent winding parts, so that the winding parts and the connecting sections form a plu