Novel screen structure design method

Abstract

The invention discloses a novel screen structure design method. According to the technical scheme, a screen cloth, main grid lines and auxiliary grid lines are involved, wherein the screen cloth is made of a steel plate, and grooves are formed and a grid line pattern is marked in the screen cloth; a plurality of rows of small holes are designed in the part, outside the grid line pattern area, of the screen cloth, a plurality of rows of grooves are formed in the direction parallel to the auxiliary grid lines, the distance (77) from the grooves to the grid line at the most marginal portion is greater than 20 mm, the small holes are arranged in an identical mode or a staggered mode, and the grooves are arranged in an identical mode or a staggered mode; in the grid line area, the auxiliary grid lines are realized through a groove etching mode, however the area where the main grid lines intersect with the auxiliary grid lines is a non-groove etching area; and the structure of the auxiliarygrid lines adopts a step-shaped design, wherein the length (J) of the upper-layer grid lines is larger than the length (K) of the lower-layer grid lines, and the length (K) of the lower-layer grid lines is equal to the length of the grid line required in a printing pattern. The method has the beneficial effects that the service life of a screen is prolonged, the photoelectric conversion efficiencyof a battery piece is improved, the usage amount of paste is reduced, the width of the grid lines is reduced, the height of the grid lines is increased, and the problems of line breakage, incompleteprinting and the like can be solved.

Description

technical field [0001] The invention relates to the field of manufacturing crystalline silicon solar cells, in particular to a novel screen structure design method. Background technique [0002] The positive electrode screen materials commonly used in the photovoltaic industry are steel wire and photosensitive glue. The method of making the screen plate is to use steel wires of different widths to cross-weave into a net shape and tighten it. On the stretched screen, the photosensitive glue is evenly coated on the screen plate, and then the printing screen plate is made by exposure and development of the bottom plate. Ordinary positive electrode grid design, the shape of the grid is cuboid. The screen of this design is prone to the following problems during use: (1) It is easy to produce problems such as disconnection and knots during printing, which is not conducive to the accumulation of paste, and it will appear when it is touched by a sharp object. The phenomenon of pla...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a new screen structure design method to achieve the purpose of improving the life of the screen and the photoelectric conversion efficiency of the cell, reducing the amount of slurry used and solving the problems of disconnection and virtual printing.

[0005] The beneficial effects of the present invention are that the life of the screen plate is increased by 8-10 times, the photoelectric conversion efficiency of the cell is increased by more than 0.10%, the amount of slurry is reduced by 15%-20%, the width of the grid line is reduced by 3-6%, and the height of the grid line Increased by 30-40%, and can solve problems such as disconnection and virtual printing

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