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Back contact solar cell module and preparation method thereof

A solar cell and back contact technology, applied in electrical components, circuits, photovoltaic power generation, etc., can solve problems such as battery series resistance rise, hidden cracks, silicon wafer warping and unevenness, and achieve the effect of simplifying the manufacturing process

Pending Publication Date: 2020-07-31
JA SOLAR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the long lateral transmission distance of carriers in this design, it is difficult to be collected by the thin grid lines of positive and negative polarity, so the series resistance of the battery will rise sharply, and the battery fill factor and photoelectric conversion efficiency will be greatly affected.
[0005] In addition, in the production process of traditional full-back contact solar cell modules with busbars on the front side, there are still problems in the solar cell modules that may be warped and uneven due to the use of a large number of welding ribbons, which may cause cracks or fragments, or may be caused by The use of a one-piece backplane design increases the difficulty of precision control and the problem of manufacturing costs

Method used

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  • Back contact solar cell module and preparation method thereof
  • Back contact solar cell module and preparation method thereof
  • Back contact solar cell module and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] see image 3 , image 3 It is the small battery sheet arranged after the full back contact solar cell sheet in Example 1 is cut. The present invention provides a back-contact solar cell module, including several small cells and conductive strips 7, wherein, the back of each small cell is tiled with p+ doped regions 2 and n+ doped regions 2 and n+ doped regions staggered along its width direction. In the impurity region 3, a positive fine grid line (positive electrode 21) in contact with it is printed on the p+ doped region 2, a negative fine grid line (negative electrode 31) in contact with it is printed on the n+ doped region 3, and a positive fine grid line is printed on the n+ doped region 3. (Positive electrode 21) and the length of negative electrode fine grid line (negative electrode 31) are infinitely close to the width of small cell sheet; Please refer to Figure 4 , the conductive strip 7 includes a substrate 71 and a conductive pattern 72 disposed on the sub...

Embodiment 2

[0068] see Figure 8 , the difference from Example 1 is that in this example, four small back-contacted solar cells such as Figure 6 The arrangement shown, that is, the n+ doped regions 3 and p+ doped regions 2 on two adjacent small cells are arranged alternately and correspondingly. At this time, the direction of half of the back-contacted solar cells is opposite to that of the original back-contacted solar cells. On the back of the small back contact solar cell, there are only silver grid lines forming ohmic contacts with the strip-shaped n+ doped region 3 and the p+ doped region 2, and there is no respectively collecting the strip-shaped n+ doped region 3 and the p+ doped region 2 current busbar.

[0069] see Figure 7, the conductive strip 7 in this embodiment is printed onto the substrate 71 by conductive glue to form a conductive pattern 72, and the conductive glue is silver metal particles wrapped with epoxy resin as an adhesive. The shape of the conductive pattern ...

Embodiment 3

[0071] Unlike Example 1, see Figure 9 , the p+ doped region 2 and the n+ doped region 3 on the n-type single crystal silicon substrate 1 present different local width and narrow shapes, which can be specifically understood as: the n+ doped region 3 is strip-shaped, including wide rectangular strips arranged alternately and a narrow rectangular strip; the p+ doped region 2 is filled between two adjacent n+ doped regions 3, wherein the length of the n+ doped region 2 is 156.75mm, and the width W1 of the narrow rectangular strip in the n+ doped region 2= 9.8mm, the width of the wide rectangular bar W11=12.7mm, the length of the wide rectangular bar W6=W7=W8=13.8mm, of course, due to the different cutting positions, the lengths of W5 and W9 vary with the cutting, but it is best to W5 and W9 are set at the same length, in this embodiment W5=W19=6.9mm. The p+ doped region 3 filled between two adjacent n+ doped regions 3 has a length of 156.75 mm. It can be understood that it is al...

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Abstract

The invention discloses a back contact solar cell module and a preparation method thereof. The back contact solar cell module comprises N small cell pieces and (N-1) conductive strips, p+ doped regions of the small cell pieces are provided with positive electrode fine grid lines, n+ doped regions of the small cell pieces are provided with negative electrode fine grid lines, and each small cell piece is not provided with a main grid line for collecting currents of the n+ doped regions and the p+ doped regions; and each conductive strip comprises a substrate and a conductive pattern arranged onthe substrate, each substrate is arranged between two adjacent small battery pieces, and the conductive patterns are used for electrically connecting the thin grid lines with opposite polarities on the two adjacent small battery pieces at intervals in sequence so as to connect the small battery pieces in series. The back contact solar cell module has high efficiency stability, the resistance losson the silver grid lines is low, and the filling factor of the module is high.

Description

technical field [0001] The invention relates to a back contact solar battery component and a preparation method thereof. Background technique [0002] The pursuit of lower production cost and higher photoelectric conversion efficiency in the field of solar cell technology is the core goal of the solar cell industry. Full back contact solar cells are different from conventional solar cells, which place both positive and negative electrodes on the back of the cell, thereby avoiding the optical loss similar to the front of conventional solar cells and improving the photoelectric conversion efficiency of the cell, so it is a high-efficiency cell technology One of the battery types that has been widely concerned and researched in the field. [0003] Existing full back-contact solar cells are designed with a busbar, and the busbar has the functions of collecting current and connecting ribbons. Due to the high short-circuit current of the full back contact solar cell, the full ba...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/042H01L31/05H01L31/18
CPCH01L31/022441H01L31/042H01L31/0512H01L31/0516H01L31/1804Y02E10/547Y02P70/50
Inventor 汤坤蒋秀林吴兰峰
Owner JA SOLAR
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