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Preparation method of photovoltaic cell string

A photovoltaic cell and cell technology, applied in photovoltaic power generation, circuits, electrical components, etc., can solve problems such as cracks in overlapping areas of cells

Active Publication Date: 2021-02-23
JA SOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the prior art adopts the scheme of flattening the welding ribbon to reduce the stress in the overlapping area, there is still point support of the welding ribbon on the battery sheet in this scheme, which will still cause obvious cracks in the overlapping area of ​​the battery

Method used

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  • Preparation method of photovoltaic cell string
  • Preparation method of photovoltaic cell string
  • Preparation method of photovoltaic cell string

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1. Connecting the grid lines on the front side of the first battery sheet to the grid lines on the back side of the second battery sheet through welding ribbons, the first battery sheet and the second battery sheet have an overlapping area;

[0056] Such as figure 2 As shown, the photovoltaic cell string proposed by the present application includes at least two cells, and each cell is provided with grid lines on the front and back sides, and the grid lines on the front side of the adjacent cell 1 are connected with the grid lines on the back side of the cell 3. The lines are connected by a plurality of ribbons 2 . The battery sheet can be any battery sheet for photovoltaic modules such as single-glass photovoltaic module battery sheet and double-glass photovoltaic module battery sheet, and is preferably a single-glass photovoltaic module battery sheet.

[0057] Step 2, connecting the first gasket to the front side of the first cell;

[0058] Such as figure 2 A...

Embodiment 2

[0065] In order to further realize the supporting effect of the spacer on the cells, the spacer 4 may include a first sub-strip 10 and a second sub-strip 11 . The first sub-strip 10 and the second sub-strip 11 can be two separate pads, or can be processed into one pad in advance, which is not limited in this application. The material of the first sub-strip 10 is less fluid than the material of the second sub-strip 11 . The combination of materials of the first sub-strip 10 and the second sub-strip 11 may include EVA and POE, pre-crosslinked EVA and EVA, low melt index EVA and EVA, EVA and high VA content EVA, etc. Plus limit. The battery sheet can be any battery sheet for photovoltaic modules such as single-glass photovoltaic module battery sheet and double-glass photovoltaic module battery sheet, and is preferably a single-glass photovoltaic module battery sheet.

[0066] Such as Figure 7 As shown, the first sub-strips 10 and the second sub-strips 11 can be arranged on th...

Embodiment 3

[0069] Such as Figure 9 As shown, the first sub-pad strip 10 and the second sub-pad strip 11 can also be connected to the battery sheet 1 in a stacked manner, with the first sub-pad strip 10 arranged above the second sub-pad strip 11, and the second sub-pad strip 11 The strip 11 is connected to the cell sheet 1 . The battery sheet can be any battery sheet for photovoltaic modules such as single-glass photovoltaic module battery sheet and double-glass photovoltaic module battery sheet, and is preferably a single-glass photovoltaic module battery sheet.

[0070] Such as Figure 10 As shown, due to the poor fluidity of the first sub-pad strip 10 during lamination, the deformation caused by lamination is small, which can ensure the supporting effect on the battery sheet 1, reduce the downward movement of the battery sheet 1, and ensure that the battery sheet in the overlapping area The distance between 1 and battery sheet 3 is greater than the thickness of the solder strip; and...

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Abstract

The invention provides a preparation method of a photovoltaic cell string. The preparation method comprises the steps of connecting a grid line on the front surface of a first cell piece to a grid line on the back surface of a second cell piece through a solder strip, wherein the first cell piece and the second cell piece have an overlapping region; connecting the first filler strip to the front surface of the first cell piece; turning over the first cell piece and the second battery piece by a first preset angle to enable the first filler strip to support the first battery piece so as to enable the solder strip to be separated from the first cell piece and the second cell piece in the overlapping area; and laminating the overturned first cell piece and the overturned second cell piece, melting the first filler strip to form a first supporting pad so as to prevent the first cell piece from moving relative to the second cell piece during lamination, and separating the solder strip in the overlapping area from the two cell pieces after the cell pieces are overturned by the filler strip. A support pad formed by melting can limit the displacement of the first cell piece during lamination, so that the solder strip does not cause point support stress to the cell pieces during lamination to cause subfissure of the cell pieces.

Description

technical field [0001] The invention relates to the field of photovoltaic manufacturing, in particular to a method for preparing a photovoltaic battery string. Background technique [0002] With the rapid development of the photovoltaic industry, the high power of photovoltaic modules is the goal pursued by the industry, and the stitch welding technology extended from the MBB series welding technology has been valued by more and more companies. The MBB welding technology is to overlap the edges of two battery sheets and weld them together through the welding strip, and flatten the welding strip in the overlapping area of ​​the two battery sheets to reduce the point support stress of the welding strip on the battery in the overlapping area , reduce the risk of battery cracking. However, although the prior art adopts the scheme of flattening the welding ribbon to reduce the stress in the overlapping area, there is still point support of the welding ribbon to the battery sheet...

Claims

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Application Information

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IPC IPC(8): H01L31/18H01L31/042
CPCH01L31/18H01L31/042Y02P70/50
Inventor 陈道远叶玉秋周艳方
Owner JA SOLAR
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