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Sorting method for reducing defective proportion of luminance inconsistence of solar cell module

A technology of solar cells and cells, which is applied in sorting and other directions, can solve problems such as bad light and dark chips, and achieve the effects of improving module production yield and module output power, reducing defective ratios, and concentrating open circuit voltage

Inactive Publication Date: 2019-08-27
TONGWEI SOLAR ENERGY CHENGDU CO LID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is: in order to solve the test and sorting method in the prior art, the PERC cells in the same gear will be produced into components, and there will be poor light and shade under EL (electroluminescence), and a method of reducing solar energy is proposed. Sorting method for bad ratio of bright and dark sheets of battery components

Method used

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  • Sorting method for reducing defective proportion of luminance inconsistence of solar cell module
  • Sorting method for reducing defective proportion of luminance inconsistence of solar cell module
  • Sorting method for reducing defective proportion of luminance inconsistence of solar cell module

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A sorting method for reducing the bad ratio of light and dark sheets of solar cell modules, firstly performing rough classification D of conversion efficiency, including the following specific steps:

[0034] D1: Measure the battery conversion efficiency value of each battery piece in the battery piece group to be tested, and obtain the battery conversion efficiency value interval composed of the battery conversion efficiency value of each battery piece and the battery conversion efficiency values ​​of all battery pieces;

[0035] D2: Set the battery conversion efficiency value partition value of the battery sheet group to be tested to 0.1%;

[0036] D3: Segment the battery conversion efficiency value interval according to the battery conversion efficiency value partition value set in step D2, and obtain several sub-battery conversion efficiency value intervals E;

[0037] D3: According to the sub-cell conversion efficiency value interval E and the battery conversion ef...

Embodiment 2

[0043] On the basis of embodiment 1, the sorting test steps are as follows in the specific work:

[0044] D1: The cell conversion efficiency value of a batch of 101 PERC cells is measured, and the cell conversion efficiency value of each cell is obtained. It can be seen that the cell conversion efficiency value range of this batch of cells is [20.1%, 21.9% %].

[0045] D2: Set the cell conversion efficiency partition value of this batch of cells to 0.1%;

[0046] D3: Divide the measured battery conversion efficiency values ​​into partitions to obtain a total of 19 sub-battery conversion efficiency intervals, namely [Eta 1 = 21.9%], [Eta 2 = 21.8%], [Eta 3 = 21.7%], ... [Eta 18 = 20.2%], [Eta 19 = 20.1%].

[0047] That is, Eta=21.9% when Eta∈[22.15, 23]. While Eta∈[22.04, 22.15], Eta=21.8%. Refer to Table 1:

[0048] Table 1 Cell test table [Eta 2 = 21.8%]

[0049]

[0050] D4: According to the battery conversion efficiency value range [Eta 1 = 21.9%], [Eta 2 = ...

Embodiment 3

[0068] On the basis of implementation 2, short-circuit current classification B is carried out, including the following steps:

[0069] B1: Conduct a short-circuit current test on the cells in each voltage secondary gear, and obtain the short-circuit current value interval of each cell and the short-circuit current values ​​of all cells in the voltage secondary gear;

[0070] B2: Set the short-circuit current partition value of the battery pack to be tested to 0.2A;

[0071] B3: According to the set short-circuit current partition value, divide the current value interval of the cell in each voltage range into segments to obtain at least one sub-short-circuit current value interval A;

[0072] B4: According to the short-circuit current value of each cell obtained in step B1 and the sub-short-circuit current value interval A obtained in step B3, the cells in the voltage secondary gear are classified, and the short-circuit current value belongs to the same sub-short-circuit curre...

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Abstract

The invention discloses a sorting method for reducing the defective proportion of luminance inconsistence of a solar cell module. According to the method, after coarse grading is conducted based on battery conversion efficiency value in the prior art, then battery pieces in the same battery conversion efficiency value grade are subjected to open-circuit voltage fine grading, or open-circuit voltage fine grading is conducted on battery pieces of the same short-circuit current grade after short-circuit current fine grading is conducted, so that the sorting purposes that the open-circuit voltageof the battery pieces in the same grade is concentrated and high in consistence are achieved, therefore battery pieces with luminance inconsistence and grade mixing under EL can be effectively avoidedat the battery end, so that the defective proportion of the luminance inconsistence under the module EL after module manufacture is reduced, the manufacturing yield of the module is improved, and theoutput power of the module is improved.

Description

technical field [0001] The invention belongs to the field of manufacturing crystalline silicon solar cells, in particular to a novel PREC solar cell classification method. Background technique [0002] At present, testing and sorting is a very important link in the production process of solar cells. The purpose of testing and sorting is to sort cells with different efficiency ranges. At present, the commonly used method of testing and sorting for conventional BSF cells is: use The conversion efficiency of the battery is graded, and every 0.1% of the conversion efficiency is a grade operation. With this classification method, the proportion of bright and dark films under the component EL in conventional component packaging is very small, which meets the component production yield standard. However, after the battery technology was upgraded to PERC (Passivated Emitter Rear Contact), the battery conversion efficiency has been greatly improved, mainly because the open circuit v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344
CPCB07C5/344
Inventor 吴俊旻张鹏王岚赖怡
Owner TONGWEI SOLAR ENERGY CHENGDU CO LID
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