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Production method for solar screen printing plate and battery assembly of solar screen printing plate

A manufacturing method and battery module technology, applied in the field of solar cells, can solve problems such as reducing cracks, reducing cell efficiency, reducing service life, etc., and achieving the effect of eliminating stress points and reducing cracks in battery components

Inactive Publication Date: 2017-10-24
NANJING DAQO NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the battery is welded in the component factory, the high point is easy to form a stress point, and the follow-up process and the field installation and use are prone to cracks and fragments, which will increase the cost and reduce the service life. When the overlapping part is hollowed out and printed, this area will not be printed The back electrode does not print the back electric field, there is no high point formation, and it can also reduce cracks, but the hollowed out area reduces the long-wave response of the cell and the increase in resistance reduces the ability of the cell to collect carriers and reduces the efficiency of the cell. Therefore, the invention of a It is necessary to solve the above-mentioned problems by a kind of solar screen production method and its battery assembly

Method used

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  • Production method for solar screen printing plate and battery assembly of solar screen printing plate
  • Production method for solar screen printing plate and battery assembly of solar screen printing plate
  • Production method for solar screen printing plate and battery assembly of solar screen printing plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: A solar screen production method and its battery assembly, including a screen main body 1, a steel wire 7 is provided on the screen main body 1, a PVA film sealing area 2 is provided inside the steel wire 7, and the PVA film A printing area 3 is arranged in the center of the membrane sealing area 2, and a silicon chip 5 is arranged outside the printing area 3, and a printed back electrode 4 is arranged on the silicon chip 5, and a printed back electric field is arranged on one side of the printed back electrode 4. 6. The printed back electric field 6 overlaps with the inclined surface of the printed back electrode 4, which is beneficial to eliminate the stress point where the battery sheet contacts the soldering strip, and reduces the hidden cracks of the battery assembly.

[0027] The screen main body 1 is made of vertically intersecting steel wires 7, and leak holes are formed at the intersections, which is conducive to scraping silver, aluminum and other...

Embodiment 2

[0028] Embodiment 2: The difference from Embodiment 1 is that the 4 segments of the printed back electrode are specifically 7 segments, which is better matched with the front electrode than in Embodiment 1, reduces the travel distance of carrier collection, increases the current, and increases the battery life. and the power it makes into components.

Embodiment 3

[0029] Embodiment 3: The difference from Embodiments 1 and 2 is that the 4 segments of the printed back electrode are specifically 8 segments, which are better matched with the front electrode than Embodiments 1 and 2, reducing the carrier collection travel distance and improving current, increasing the power of the battery and its components.

[0030] The preparation method of the present invention is as follows:

[0031] S1: When making the printing screen, adjust the density of the steel wire 7 according to the printing requirements and cross-tighten the steel wire 7 on the metal frame;

[0032] S2: Coat the steel wire 7 with a PVA (polyvinyl alcohol) film, and use a laser to remove the PVA film at the electrode to be printed to form a mesh;

[0033] S3: During printing, the conductive paste such as silver and aluminum can be leaked to the silicon wafer 5 through the mesh on the screen main body 1 by scraping the scraper;

[0034] S4: Finally, electrodes are formed by sin...

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Abstract

The invention discloses a production method for a solar screen printing plate and a battery assembly of the solar screen printing plate. The solar screen printing plate comprises a screen printing plate body. Steel wires are arranged on the screen printing plate body. A PVA film sealing region is arranged on the inner sides of the steel wires. A printing region is arranged at the center in the PVA film sealing region. A silicon wafer is arranged outside the printing region. A printing back contact is arranged on the silicon wafer. A printing back surface field is arranged on one side of the printing back contact. The printing back surface field and the printing back contact are arranged in an inclined face overlapped manner. According to the production method, by the adoption of the screen printing process, the silicon wafer processed by PECVD is printed with silver-aluminum slurry, the positive electrode, the negative electrode and the back surface field of the battery piece are produced, the printed back contact and the back surface field are arranged in the inclined face overlapped manner by adjusting the density of the steel wires of the screen printing plate, the stress point of the portion, in contact with a solder strip, of the battery piece is eliminated, and hidden cracks of the battery assembly are reduced.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for making a solar screen and a cell assembly thereof. Background technique [0002] As we all know, as far as the existing photovoltaic industry is concerned, the positive electrode grid line electrode in the crystalline silicon solar sheet plays a huge role, and it acts as a collection of photo-generated carriers. At the same time, for ordinary P-type matrix crystalline silicon cells, the generation of carriers (the magnitude of the short-circuit current) and the loss of carriers during the collection process (the magnitude of the series resistance) largely determine the battery life. The advantages and disadvantages of the electrical performance of the chip. [0003] Depend on Figure 1-3 It can be seen that before the screen printing adjustment, the back electrode is printed first and then the back electric field is printed during screen printing, and the back e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/14H01L31/0224
CPCB41C1/14H01L31/022441Y02E10/50
Inventor 吴琦杨威王晓龙
Owner NANJING DAQO NEW ENERGY