A new type of screen and its manufacturing method

Abstract

The invention relates to a novel screen plate and a manufacturing method thereof. The screen plate comprises a mesh cloth, an upper film layer and a lower film layer are respectively arranged on two sides of the mesh cloth, and upper film layers and lower film layers are respectively provided with upper concaves. The groove and the lower groove, the upper groove and the lower groove correspond up and down and the central axes coincide, and form a channel connected to each other through the mesh; the width of the upper groove and the lower groove is greater than the width of the bottom of the groove, and the position of the bottom of the groove Located on the side close to the mesh. The manufacturing method of the screen plate adopts the method of uniformly covering the upper and lower film layers on both sides of the mesh cloth and drying them, and cutting the upper and lower film layers with a laser after being positioned by a positioning mechanism to form grooves correspondingly arranged on the upper and lower film layers. The electrode paste shape with a large aspect ratio can be obtained by using the screen plate of the present invention. While ensuring sufficient cross-sectional area of ​​the paste, the width of the paste on the surface of the solar cell can be effectively reduced, the shading area of ​​the grid line can be reduced, and the solar energy can be improved. The conversion efficiency of the battery.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a screen plate for improving the aspect ratio of screen printing electrodes in a solar cell manufacturing process and a manufacturing method thereof. Background technique [0002] In the photovoltaic industry, screen printing is mainly used in the electrode forming of batteries, and printing is carried out by using the basic principle that the screen graphics part of the mesh is transparent to the slurry, and the non-graphic part of the mesh is impermeable to the slurry. When printing, pour the slurry at one end of the screen, apply a certain pressure on the slurry part of the screen with a scraper, and move toward the other end of the screen at the same time. The slurry is squeezed from the mesh of the graphic part to the substrate by the scraper during the movement. During the printing process, the squeegee is always in line contact with the screen printing plate and the s...

AI Technical Summary

Problems solved by technology

Under a certain aspect ratio, in order to make the cell surface paste have a sufficient cross-sectional area, it can only be achieved by increasing the paste width, but this will lead to an increase in the shading area of ​​the paste and a decrease in the number of photons received by the surface of the solar cell , resulting in low conversion efficiency of solar cells

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