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A kind of 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, and achieve the effects of simple structure, easy processing, and improved production efficiency

Active Publication Date: 2022-08-02
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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  • A kind of preparation method of photovoltaic cell string
  • A kind of preparation method of photovoltaic cell string
  • A kind of preparation method of photovoltaic cell string

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1. Connect the grid lines on the front side of the first cell sheet to the grid lines on the back side of the second cell sheet through a welding tape, and the first cell sheet and the second cell sheet have an overlapping area;

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

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

[0058] like figure 2 As shown, after the bonding ribbon 2 is connected, a spacer 4 can be provided on the front...

Embodiment 2

[0065] In order to further realize the supporting effect of the gasket on the battery sheet, the gasket 4 may include a first sub-gasket 10 and a second sub-gasket 11 . The first sub-cushion strip 10 and the second sub-mat strip 11 may be two separate cushion strips, or may be pre-processed into a single cushion strip, which is not limited in this application. The fluidity of the material of the first sub-mat strip 10 is weaker than that of the material of the second sub-mat strip 11 . The combination of materials of the first sub-mat strip 10 and the second sub-mat 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 cell can be any cell for a photovoltaic module, such as a cell for a single-glass photovoltaic module or a cell for a double-glass photovoltaic module, preferably a cell for a single-glass photovoltaic module.

[0066] like Figure 7 As shown, the first sub-gasket 10 and th...

Embodiment 3

[0069] like 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 disposed 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 cell can be any cell for a photovoltaic module, such as a cell for a single-glass photovoltaic module or a cell for a double-glass photovoltaic module, preferably a cell for a single-glass photovoltaic module.

[0070] like Figure 10 As shown in the figure, 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 of the cell 1, reduce the downward movement of the cell 1, and ensure that the cell in the overlapping area is guaranteed. The distance between 1 and the battery sheet 3 is greater than the thickness of the welding tape; and the second sub-pad 11 has str...

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Abstract

The present application provides a method for preparing a photovoltaic cell string, which includes connecting a grid line on the front side of a first cell sheet to a grid line on the back side of a second cell sheet through a welding tape, and the first cell sheet and the second cell sheet have overlapping area; connect the first gasket to the front of the first cell; flip the first and second cells by a first preset angle, so that the first gasket supports the first cell to Separate the welding tape from the first battery sheet and the second battery sheet in the overlapping area; laminate the flipped first and second battery sheets, the first gasket melts and forms a first support pad to prevent When the first cell is laminated, it is displaced relative to the second cell. The gasket can separate the welding tape in the overlapping area from the two cells after the cell is turned over, and the support pad formed by melting can restrain the first cell. The amount of displacement that occurs during lamination, so that the welding tape will not cause point support stress to the cells during lamination, resulting in cracks in the cells.

Description

technical field [0001] The invention relates to the field of photovoltaic manufacturing, in particular to a method for preparing a photovoltaic cell 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 string welding technology is valued by more and more companies. The MBB stitch welding technology is to weld the edges of two battery sheets together by overlapping the welding strips, and flatten the welding strip in the overlapping area of ​​the two battery sheets to reduce the point support stress of the welding strip to the battery in the overlapping area. , reducing the risk of battery cracking. However, although the solution of flattening the welding tape to reduce the stress in the overlapping area is adopted in the prior art, the point support of the welding tape to the battery sheet still exists ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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