Test method of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack

A technology of solar cells and testing methods, applied in the direction of thermal development of materials, etc., can solve the problems of multiple weighing and baking links, incomplete extraction of xylene, systematic errors, etc., and achieve low long-term overall cost, short test cycle, and measurement The effect of fewer links

Inactive Publication Date: 2010-12-15
TRINA SOLAR CO LTD
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is: in view of the current defects such as incomplete extraction of xylene, secondary cross-linking and many steps of weighing and baking, and easy occurrence of systematic errors, the present invention provides a photovoltaic solar cell module EVA cross-linked rate test method

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Embodiment Construction

[0022] A method for testing the cross-linking rate of EVA of a photovoltaic solar cell module. The cross-linking rate of EVA is represented by gel content. The heat flow of EVA in the middle and the principle of differential thermal analysis are used to carry out DSC calorimetric analysis. The calculation method of the crosslinking rate of the component EVA, that is, the gel content is: gel content=(H1-H2) / H1*100%, H1 is the exothermic heat per unit weight of the raw material, and H2 is the exothermic heat per unit weight of the residual uncrosslinked EVA after lamination.

[0023] When the material is crystallized or cross-linked, the degree of disorder inside the material is reduced, and the free energy also drops to a relatively stable state. Therefore, when the cross-linking or crystallization occurs, it must be accompanied by an exothermic reaction. Therefore, the crosslinking rate of EVA can be calculated by measuring the heat flow of EVA during the lamination process an...

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Abstract

The invention relates to a test method of the EVA (Ethylene Vinyl Acetate) crosslinking rate of a photovoltaic solar battery pack. The EVA crosslinking rate is represented by gel content. The test method comprises the steps of: testing the crosslinking rate of the EVA of the packet by using a DSA heat flux differential analysis method, measuring the heat flux of the EVA in the process of lamination and carrying out DSC calorimetry analysis by using differential thermal analysis. The calculation method of the EVA (Ethylene Vinyl Acetate) crosslinking rate (gel conten) of the photovoltaic solar battery pack adopts the flowing formula: gel content=(H1-H2)/H1*100%, wherein H1 is heat release of raw material by unit weight, and H2 is heat release of un-crosslinked EVA by unit weight left after lamination. The invention has the advantages of high precision, less error, short test cycle and low cost.

Description

technical field [0001] The invention relates to a method for testing the cross-linking rate of EVA of photovoltaic solar industry components. Background technique [0002] During the encapsulation lamination process of EVA (ethylene-vinyl acetate copolymer), EVA will undergo chemical reaction and crosslink. The cross-linking rate of EVA is generally expressed in terms of gel content, that is, the percentage of cross-linked EVA in the total amount of EVA. [0003] At present, the xylene extraction method is generally used in the photovoltaic solar industry to measure the EVA cross-linking rate of module products. However, due to incomplete extraction, secondary cross-linking and many weighing and baking links during the extraction process, it is easy to produce systematic errors and other influences. , the xylene extraction method often has large errors, so that the crosslinking rate measured by the xylene extraction method will be much higher than the actual value. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 谢锦文
Owner TRINA SOLAR CO LTD
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