Positive electrode screen printing plate for high-sheet-resistance crystalline-silicon solar battery

Abstract

The invention discloses a positive electrode screen printing plate for a high-sheet-resistance crystalline-silicon solar battery. The positive electrode screen printing plate comprises a screen printing plate main body (1), wherein the screen printing plate main body (1) is provided with a main grid line (2) and an auxiliary grid line (3) which is vertical to the main grid line (2), and the positive electrode screen printing plate is characterized in that the width of the auxiliary grid line (3) in the middle area of the screen printing plate main body (1) is greater than that of the auxiliary grid lines (3) in two side areas. By adopting different auxiliary grid lines in different widths, the graphic design of a dense grid is realized while the quantity of the auxiliary grid lines is increased, and the production demand of the high-sheet-resistance crystalline-silicon solar battery is satisfied; the shading area of a graph is reduced, while the graph printing completeness is guaranteed; and on the basis of guaranteeing the high efficiency of the crystalline-silicon solar battery, the silver paste consumption is reduced by 13.7 percent compared with a conventional screen printing plate.

Description

technical field [0001] The invention relates to the technical field of crystalline silicon solar cells, in particular to a positive electrode screen for high square resistance crystalline silicon solar cells which improves production efficiency and reduces consumption of silver paste. Background technique [0002] The positive electrode screen is used in the screen printing process in the production of crystalline silicon cells, and the silver paste is printed and sintered to collect current and lead out the electrode. The design of the screen pattern determines the printing effect of the silver paste and the collection effect of the current, at the same time determines the consumption of the silver paste, and finally determines the photoelectric conversion efficiency of the solar cell. The positive electrode screen used for the production of high square resistance crystalline silicon solar cells generally includes three main grid lines and 80 auxiliary grid lines perpendic...

AI Technical Summary

Problems solved by technology

The width of the auxiliary grid lines remains unchanged and the number of them is increased, which increases the shading area of ​​the paste and reduces the collected current, so the photoelectric conversion efficiency is reduced, and the consumption of silver paste is increased, which increases the production cost; If the number of sub-grid lines is increased while reducing its width, this can ensure that the shading area and silver paste consumption remain almost unchanged, but production practice has found that when printing fine grid lines, the grid lines are too thin to make the graphic There are frequently false prints in the middle, which is mainly caused by the strip printing scraper. When printing, the strip scraper is perpendicular to the sub-grid line and printed along the direction parallel to the sub-grid line, so the middle position of the scraper bar ( Corresponding to the middle position of the screen graphics) the force is small, so there will be poor printing such as virtual printing, so the existing fine grid line screen cannot guarantee the integrity of graphic printing, which affects the appearance of the battery sheet, and the graphics are not good. Integrity will also affect the current collection effect and thus affect the conversion efficiency

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