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Test method for reflection coefficient in photovoltaic welding strip and method for testing I<SC> difference among different welding strip assemblies

A photovoltaic welding ribbon and measuring method technology, applied in the field of solar cells, can solve the problem of inability to measure the internal reflection coefficient of the welding ribbon, and achieve the effect of avoiding power loss and simplifying the evaluation process

Active Publication Date: 2017-09-22
ATESI PHOTOVOLTAI SCI & TECH SUZHOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first purpose of the present invention is to provide a method for measuring the internal reflection coefficient of the photovoltaic ribbon, so as to alleviate the technical problem that the internal reflection coefficient of the solar ribbon cannot be measured in the prior art

Method used

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  • Test method for reflection coefficient in photovoltaic welding strip and method for testing I&lt;SC&gt; difference among different welding strip assemblies
  • Test method for reflection coefficient in photovoltaic welding strip and method for testing I&lt;SC&gt; difference among different welding strip assemblies
  • Test method for reflection coefficient in photovoltaic welding strip and method for testing I&lt;SC&gt; difference among different welding strip assemblies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment is a method for measuring the internal reflection coefficient of a photovoltaic ribbon, which includes the following steps:

[0069] Step a): Choose 10 5-bus grid monocrystalline solar cells, with a side length of 156.75mm and an area of ​​244cm 2 , The Isc distribution of the 10 cells is in the range of 9.5A-9.51A, the reflectivity is in the range of 5%-5.5%, and the SiN refractive index is in the range of 2.04-2.07;

[0070] Divide the above 10 cells into 2 groups, 5 cells in each group, numbered C1-C5 and D1-D5 in sequence, where C1-C5 is one group and D1-D5 is the other group;

[0071] Step b): Weld the front and back sides of the above 10 solar cells with welding tape, and weld the bus bar;

[0072] Step c): Place the solder tape A to be tested (width 0.9mm, length 160mm) on the cell surface of C1-C5, and place the solder tape B (width 0.9mm, length 160mm) on the surface of the cell C6-C10;

[0073] C1 cell does not put extra welding strip A to be tested, C2 ...

Embodiment 2

[0097] This embodiment is a method for measuring the internal reflection coefficient of a photovoltaic ribbon, which includes the following steps:

[0098] Step a): Choose 10 5-bus grid monocrystalline solar cells, with a side length of 156.75mm and an area of ​​244cm 2 , The Isc distribution of the 10 cells is in the range of 9.5A-9.51A, the reflectivity is in the range of 5%-5.5%, and the refractive index of SiN is in the range of 2.04-2.07; the above 10 cells are sequentially numbered as C1-C10;

[0099] Step b): Weld the front and back sides of the above 10 solar cells with welding tape, and weld the bus bar;

[0100] Step c): Place the solder ribbon C (width 0.9mm, length 160mm) to be tested on the surface of the cells C1-C10;

[0101] C1 cell does not put additional welding strip C to be tested, C2 cell puts 1 welding strip C to be tested, C3 cell puts 2 welding strips C to be tested, C4 cell puts 3 welding strips C to be tested,... , And so on, the C10 cell puts 9 welding stri...

Embodiment 3

[0110] This embodiment is a method for measuring the internal reflection coefficient of a photovoltaic ribbon, which includes the following steps:

[0111] Step a): Choose 2 pieces of 5 main grid monocrystalline cells, the side length of the cells is 156.75mm, and the area is 244cm 2 , The Isc of these 2 cells is distributed in the range of 9.5A-9.51A, the reflectivity is in the range of 5%-5.5%, and the refractive index of SiN is in the range of 2.04-2.07; the above 10 cells are sequentially numbered as C1-C2;

[0112] Step b): Weld the front and back sides of the two solar cells with welding tape, and weld the bus bar;

[0113] Step c): Place the solder tape D (width 0.9mm, length 160mm) to be tested on the surface of the cells of C1-C2;

[0114] C1 cell does not put an additional welding strip D to be tested, and C2 cell puts one welding strip D to be tested;

[0115] Step d): The method for placing the solder tape C to be tested in the step c) is: place the solder tape D to be test...

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Abstract

The invention provides a test method for an internal reflection coefficient of a photovoltaic welding strip and a method for testing I<SC> difference among different welding strip assemblies, and relates to the field of a solar cell. The test method for the internal reflection coefficient of the photovoltaic welding strip comprises the following steps of selecting n battery pieces, placing welding strips to be tested on front surfaces of the battery piece, and placing (m-1) welding strips to be tested on a front surface of an m(th) battery piece; packaging the battery pieces on which the welding strips to be tested are placed respectively by package materials to form assemblies, and testing I<SC> of each assembly, wherein I<SC1> is a short-circuit current of the assembly on which the welding strips to be tested are not placed; and making a discrete diagram by taking numbers of the welding strips to be tested placed on the battery pieces as a horizontal coordinate and the I<SC> as a longitudinal coordinate, and obtaining a straight line after fitting, wherein the fitting slope of the straight line is k, and the internal reflection coefficient T of the welding strip to be tested is equal to {1+[k*(area of the battery piece after a main grid is removed)] / [(I<SC1>*(width of the welding strip to be tested)*(length of the battery piece)]}.

Description

Technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for measuring the internal reflection coefficient of photovoltaic ribbons and the determination of the I of different ribbon components. SC Different methods. Background technique [0002] For solar cell modules, there are three parts of where the light is irradiated on the ribbon. The first part is the part absorbed by the solder ribbon, the second part is the part reflected by the solder ribbon into the air, and the third part is directly reflected by the solder ribbon on the cell or reflected on the interface between the glass and the air and then reflected back again Part of the cell. The proportion of the third part is the internal reflection coefficient of the ribbon. The internal reflection coefficient of different ribbons is different. The internal reflection coefficient of the ribbon directly affects the power of the component. However, the internal reflectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L21/66H01L31/05H01L31/18
CPCH01L22/12H01L22/14H01L31/0504H01L31/188Y02E10/50Y02P70/50
Inventor 万松博王栩生涂修文邢国强
Owner ATESI PHOTOVOLTAI SCI & TECH SUZHOU
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