Step-by-step printing electrode main and auxiliary grid lap joint structure

The utility model discloses a step-by-step printing electrode main grid and auxiliary grid lap joint structure. The lap joint structure comprises a lap joint end of each main grid and a lap joint head, corresponding to the lap joint end of each main grid, on each auxiliary grid, the lap joint end of each main grid and the lap joint head of each auxiliary grid are in lap joint to form a lap joint part, and the overall width of the lap joint part is gradually increased from the central position of the solar cell to the two sides of the solar cell. The overall width of the overlapping part of themain grid and the auxiliary grid is gradually increased from the central position of the solar cell to the two sides. The overlapping allowance of the main grid and the auxiliary grid under the condition that the offset error is increased can be provided, good overlapping of the main grid and the auxiliary grid is achieved, the shading area can be reduced, the photoelectric conversion efficiencyis improved, silver paste