Preparation method of novel stitch welding assembly, stitch welding assembly and machining equipment

The invention discloses a preparation method of a novel stitch welding assembly, the stitch welding assembly and machining equipment. The preparation method comprises the following steps: carrying outflattening processing on a plurality of to-be-machined parts on a welding strip till the to-be-machined parts become flattened parts of a strip-shaped structure, wherein the flattened parts have a preset thickness, a preset distance is kept between every two adjacent to-be-machined parts, and each to-be-machined part has a preset length; carrying out heating treatment on the flattened parts of the welding strip; annealing and cooling the heated welding strip; drying the cooled welding strip; positioning each flattened part of the dried welding strip between every two adjacent battery pieces and carrying out welding to form an assembly; and laminating the welded assembly to obtain the stitch welding assembly. According to the preparation method of the novel stitch welding assembly, the flattened parts of the weldi