Film structure for solar crystalline silicon battery slice and printing screen of film structure

Abstract

The invention discloses a film structure for a solar crystalline silicon battery slice and a printing screen of the film structure. Two frame lines, which are parallel to main grid lines, of a printing pattern on the film structure and the printing screen are wave lines, the wavelength of each wave line is 0.05-3.0mm, and the amplitude is 0.05-0.5mm. According to the film structure for the solar crystalline silicon battery slice and the printing screen of the film structure, the frame lines of the printing pattern are in a wave line design, and in the prepared printing screen, an included angle of 10-30 degrees is formed at an overlapping position of a netting wire and the corresponding frame line, thus the phenomenon that the overlapping positions of the frame lines of the printing pattern and the corresponding netting wires are completely blocked by the netting wires is prevented, the printing permeability is ensured, loss of the photoelectric conversion efficiency of the crystalline silicon battery slice caused by grid breaking and EL addition is prevented, the poor appearance caused by too thick frame lines is prevented, the slurry weight of a single battery slice is lowered, and the slurry cost of a battery slice manufacturer can be saved by above 20 percent.

Description

technical field [0001] The invention relates to the technical field of screen printing, in particular to a film structure for solar crystal silicon cells and a printing screen plate thereof. Background technique [0002] With the increasing pressure of improving the efficiency of solar cells, the traditional solar crystalline silicon printing screen can no longer meet the market demand, and the knotless screen has emerged as the times require. The knotless screen version adopts a 0-degree angle to stretch the net (the angle between the wire diameter and the screen frame is 0 degrees), and the warp direction can ensure a 0-degree angle, but due to the weaving characteristics of the mesh itself, the weft direction cannot guarantee a 0-degree angle, so , the frame line of the cell graphic of the screen plate produced cannot completely avoid the network knot. [0003] When the mesh overlaps with the border line of the cell graphics, the border line is completely blocked by the ...

AI Technical Summary

Problems solved by technology

[0002] As the pressure to improve the efficiency of solar cells is increasing, the traditional solar crystalline silicon printing screen can no longer meet the market demand, and the knotless screen emerges as the times require.

The knotless screen version adopts a 0-degree angle to stretch the net (the angle between the wire diameter and the screen frame is 0 degrees), and the warp direction can ensure a 0-degree angle, but due to the weaving characteristics of the mesh itself, the weft direction cannot guarantee a 0-degree angle, so , the border line of the cell graph of the screen version cannot completely avoid the network knot

[0003] When the mesh overlaps with the border line of the cell graphics, the border line is completely blocked by the mesh, and the printing is impermeable, resulting in missing or disconnected border lines of the printed pattern, increasing the EL of the cell, reducing the efficiency, and failing to improve the crystal. The purpose of photoelectric conversion efficiency of silicon cells makes the meshless screen version meaningless

[0004] In order to solve the above problems, the current common practice in the market is to thicken the border line of the graphic, but when the mesh and the border line are completely avoided, the width of the border line will increase, and abnormal appearance such as thick lines and nodes will appear during the printing process. , which greatly affects the qualification rate of the cell, and the stability of the screen plate making is poor, and the yield rate is uncontrollable, which greatly increases the cost of the screen plate making

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