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Preparation method of sliced solar cell piece

A technology for solar cells and solar cells, applied in the field of solar cells, can solve the problems of increased stress, large thickness and short circuit of solar cell modules, and achieve the effects of improving photoelectric conversion efficiency, small damage and reducing module stress.

Inactive Publication Date: 2019-09-06
JA SOLAR TECH YANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this connection method is that the thickness of the overlapping part of two adjacent solar cells is relatively large, and the increase in thickness will increase the stress of the solar cell module, and there is a risk of short circuit when the solder ribbon passes between the two solar cells.

Method used

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  • Preparation method of sliced solar cell piece
  • Preparation method of sliced solar cell piece
  • Preparation method of sliced solar cell piece

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] figure 2 The preparation method of the shown crystalline silicon solar cell mainly includes the following steps:

[0058] Step 1, cleaning the velvet.

[0059] The silicon substrate 1 is cleaned, and the front side of the silicon substrate 1 is textured.

[0060] Step 2, forming an emitter layer 2 .

[0061] The front side of the silicon substrate 1 is doped by means of diffusion, ion implantation, etc. to form an emitter layer 2 .

[0062] Step 3, etching and removing phosphorus (borosilicate) glass.

[0063] Step 4, forming the front anti-reflection passivation layer 3 and the back passivation layer 5 .

[0064] A front anti-reflection passivation layer 3 is formed on the emitter layer 2 , and a rear passivation layer 5 is formed on the back of the silicon substrate 1 .

[0065] Step 5, printing electrode paste.

[0066] The front electrode paste is printed on the front anti-reflection passivation layer 3, and the back electrode paste is printed on the back pas...

Embodiment 1

[0092] This embodiment provides a method for preparing a sliced ​​solar cell sheet with notches on the edge and a solar cell module prepared by using the obtained sliced ​​solar cell sheet.

[0093] In this embodiment, a sliced ​​solar cell 200 with a notch on the edge is prepared by cutting a 5BB (5 busbar) whole solar cell 100 with 5 elliptical through holes X, and the specific steps are as follows:

[0094] Step 101 , laser drilling is performed on a chamfered P-type single crystal silicon wafer with a size of 158.75mm×158.75mm.

[0095] like Image 6 As shown, the through hole X is elliptical, and the number is 5. The length L of the through hole X is 2 mm to 4 mm, and the width W of the through hole X is 1 mm to 3 mm. One through hole X corresponds to one busbar line, and 5 The center of the via hole X is located on the same straight line perpendicular to the busbar and in the middle of the busbar.

[0096] Step 102, cleaning the silicon wafer, and making texture on the...

Embodiment 2

[0106] This embodiment provides a method for preparing a sliced ​​solar cell sheet with notches on the edge and a solar cell module prepared by using the obtained sliced ​​solar cell sheet.

[0107] In this embodiment, a sliced ​​solar cell with a notch on the edge is prepared by cutting a 5BB (5 busbar) whole solar cell with 5 elliptical through holes, and the specific steps are as follows:

[0108] Step 201 , laser drilling is performed on a chamfered P-type single crystal silicon wafer with a size of 158.75mm×158.75mm.

[0109] like Image 6 As shown, the through hole X is elliptical, and the number is 5. The length L of the through hole X is 2 mm to 4 mm, and the width W of the through hole X is 2 mm to 6 mm. One through hole X corresponds to one busbar line, and 5 The center of the via hole X is located on the same straight line perpendicular to the busbar and in the middle of the busbar.

[0110] Step 202, cleaning the silicon wafer, and making texture on the front sid...

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Abstract

The invention discloses a preparation method of a sliced solar cell piece, and belongs to the technical field of solar cells. The preparation method comprises the steps of preparing the whole solar cell piece with through holes, wherein a plurality of through holes are formed in a first direction; and cutting the whole solar cell piece along the first direction, and allowing a cutting line to penetrate through the plurality of through holes to obtain the sliced solar cell piece. A Pit is formed in an edge of the sliced solar cell piece obtained by the preparation method, a non-pit part at theedge of the sliced solar cell piece can be coincided with the edge of an adjacent solar cell piece when the sliced solar cell piece is used for preparing a solar cell module, a welding band penetratesthrough the pit, so that the utilization rate of a light-receiving region of the solar cell module is improved, the module stress is reduced, and the short-circuit risk of the module is reduced; andmoreover, the sliced solar cell piece obtained by the preparation method is relatively small in damage, and the photoelectric conversion efficiency of the solar cell module is favorably further improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing sliced ​​solar cells. Background technique [0002] Solar power generation is a clean, sustainable and cost-effective way of generating electricity. Solar cell modules are an important part of solar power generation. The solar battery module includes a battery string formed by connecting a plurality of solar battery sheets through welding ribbons. One end of the ribbon is connected to one electrode of one cell, and the other end of the ribbon is connected to the other electrode of an adjacent cell. There is a gap area of ​​about 2 mm between adjacent cells. The existence of the gap region causes waste of the light-receiving area of ​​the solar cell module, which affects the overall photoelectric conversion efficiency of the solar cell module. [0003] In the related art, in order to improve the utilization rate of the light-receiving area of ​​the so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCH01L31/1804Y02E10/547Y02P70/50
Inventor 陈斌周艳方尹海鹏
Owner JA SOLAR TECH YANGZHOU