Battery module laser welding sleeve, pressing mechanism and welding machine

The utility model discloses a battery module laser welding sleeve, hold-down mechanism and welding machine, wherein the battery module laser welding sleeve comprises a body, one end of the body is provided with a hold-down surface, the body is provided with a first through hole, the first through hole penetrates through the hold-down surface, the hold-down surface is provided with an elastic layer, and the elastic layer is provided with a first through hole. And the first through hole is used for allowing laser to pass through. According to the battery module laser welding sleeve provided by the utility model, the elastic layer is arranged on the pressing surface, so that when the battery module laser welding sleeve is used, the elastic layer can exert the elastic characteristic of the elastic layer, fill a gap between the welding sleeve and a to-be-welded part and absorb size and form and location tolerance, the to-be-welded part can be more uniformly and stably pressed, the welding gap is reduced, and the w