Novel front side grid line printing method

Abstract

The invention discloses a novel front side grid line printing method, which comprises the processing steps that a well-prepared silk screen printing plate is coated with photo-sensitive resists, then a well-prepared image of which only a partial main grid area can be developed is placed on an exposure machine, and afterwards, the screen printing plate is placed on the image; the well-coated photo-sensitive resists are exposed, and the screen printing plate is splashed wet by using water and is then flushed at strong water pressure to develop the image; the screen printing plate is mounted on a printing machine, silver paste is guided into the printing machine; and front-side silver paste is printed and is finally dried and sintered, and then the preparation of a battery piece is completed. By using the novel front side grid line printing method, the thickness of a main grid on the front side of the battery piece can be effectively reduced, the main grid and an auxiliary grid of different thicknesses can be obtained on the front side of the solar battery piece under the condition that one-time printing is adopted, the consumption of the silver paste is reduced, and meanwhile, the photoelectric conversion efficiency of the battery piece cannot be influenced, so the novel front side grid line printing method is suitable for mass production of solar batteries.

Description

technical field [0001] The invention relates to a novel front grid line printing method, which belongs to the technical field of solar cell production methods. Background technique [0002] When preparing the front grid lines of conventional solar cells, the main grid and the sub-grid are printed at the same time, and the thickness of the main grid is the same as that of the sub-grid after printing. The silver paste printed on the busbar accounts for 30% to 40% of the total consumed silver paste. In the actual application of solar cells, the function of the main grid is mainly to transmit the current collected by the auxiliary grid to the solder strips in the module, and the thickness does not need to be consistent with that of the auxiliary grid. [0003] In order to reduce the consumption of busbar silver paste, two methods are currently used in the industry: secondary printing and broken grid structure. [0004] The second printing is to print the main grid and the auxi...

AI Technical Summary

Problems solved by technology

[0004] The second printing is to print the main grid and the auxiliary grid separately, so that the thickness of the main grid and the auxiliary grid can be adjusted separately, but this method requires additional printing equipment and space, and needs to upgrade the existing production line, and the cost higher

However, this method only reduces the printing area, and the thickness of the prepared main grid line is still the same as that of the auxiliary grid, and at the same time reduces part of the welding area, resulting in an increase in resistance loss after welding.