Lithium battery cell connecting piece laser welding method

The invention discloses a lithium battery cell connecting piece laser welding method. The method comprises the specific steps that 1, a connecting piece of a composite material with the surface plated with brazing filler metal is obtained; 2, a cover plate with a hollow middle is used for tightly pressing the connecting piece onto the surface of a pole, the position of the hollow middle is aligned with a welding area of the connecting piece, the welding area is formed through rough treatment, a brazing filler metal plating layer is arranged on the welding face of the connecting piece and the pole, and the range of the gap between the connecting piece and the pole is smaller than 0.1 mm; and 3, the welding area of the connecting piece is movably heated through welding laser, so that the welding material of the connecting piece is melted, and welding is completed. According to the method, a fixing structure of a pressing tool and the cover plate is arranged, and the connecting piece is arranged on the pole, so