Volume resistivity test method of ethylene vinyl acetate copolymer (EVA) adhesive film used for photovoltaic module packaging

A photovoltaic module packaging and volume resistivity technology, applied in the field of measurement, can solve the problems of large measurement errors, troublesome operation, and low measurement accuracy, and achieve the effects of accurate volume resistivity, good adhesion, and simple calculation process

Active Publication Date: 2013-04-24
GUANGZHOU LUSHAN NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of large measurement error, low measurement accuracy and troublesome operation in the volume resistivity test method of EVA film in the prior art, and to provide a volume resistivity test method of EVA film for photovoltaic module packaging Method, this test method adopts a conventional high insulation volume resistivity measuring instrument, the main point is to use aluminum foil, copper sheet or other good conductors to make auxiliary electrodes on the EVA surface, which reduces the extremely high contact resistance between the EVA surface and the measuring electrode At the same time, the relative volume resistivity calculation method of EVA film per unit weight is introduced to evaluate its relative insulation, which can effectively reduce test errors and accurately evaluate the difference in volume resistivity of materials. It has small measurement errors, high measurement accuracy and easy operation. simple features

Method used

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  • Volume resistivity test method of ethylene vinyl acetate copolymer (EVA) adhesive film used for photovoltaic module packaging
  • Volume resistivity test method of ethylene vinyl acetate copolymer (EVA) adhesive film used for photovoltaic module packaging
  • Volume resistivity test method of ethylene vinyl acetate copolymer (EVA) adhesive film used for photovoltaic module packaging

Examples

Experimental program
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Effect test

Embodiment 1

[0037] One, the volume resistivity testing method of EVA adhesive film for photovoltaic module encapsulation of the present invention, carry out according to the following steps:

[0038] 1. Make samples:

[0039]1-1. Use the EVA film G102-1 produced by Guangzhou Lushan New Materials Co., Ltd. with a thickness of 0.5mm, and cut the EVA film into 5 samples of 5cm×5cm in size with a utility knife. A 5×5cm auxiliary electrode (25cm 2 ).

[0040] 1-2. Stack the auxiliary electrode 2, EVA film 1, and auxiliary electrode 2 in order from top to bottom, put them into the laminator, and place a mold frame to control the thickness around them. Laminate at a temperature of 140°C , evacuate for 6 minutes, pressurize for 1 minute, and hold the pressure for 15 minutes to carry out lamination, cooling, and trimming to prepare test samples (such as Figure 4 As mentioned), the sample thickness is required to be uniform and free of air bubbles. Store the samples in a container with a desic...

Embodiment 2

[0051] The EVA film G103-1 produced by Guangzhou Lushan New Material Co., Ltd. is used, with a thickness of 0.5mm. According to the same sample preparation method and process as in Example 1, the volume resistivity using the auxiliary electrode, the relative volume resistivity and the wet insulation resistance using the auxiliary electrode were tested respectively, and the results are shown in Table 1.

[0052] The above-mentioned EVA film is adopted, with a thickness of 0.5mm. According to the same sample preparation method and process as in Example 1, the volume resistivity measured by the conventional method was tested, and the results are shown in Table 1.

Embodiment 3

[0054] The EVA film G104-1 produced by Guangzhou Lushan New Material Co., Ltd. is used, with a thickness of 0.5mm. According to the same sample preparation method and process as in Example 1, the volume resistivity using the auxiliary electrode, the relative volume resistivity and the wet insulation resistance using the auxiliary electrode were tested respectively, and the results are shown in Table 1.

[0055] The above-mentioned EVA film is adopted, with a thickness of 0.5mm. According to the same sample preparation method and process as in Example 1, the volume resistivity measured by the conventional method was tested, and the results are shown in Table 1.

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Abstract

The invention discloses a volume resistivity test method of an ethylene vinyl acetate copolymer (EVA) adhesive film used for photovoltaic module packaging, the volume resistivity test method includes the following steps: (1) preparing a sample: respectively arranging auxiliary electrodes on the upper surface and the lower surface of the EVA adhesive film to obtain the sample; (2) testing resistance: testing the sample through a high-insulation volume resistivity tester and reading a testing resistance; (3) calculating volume resistivity: calculating the volume resistivity of the EVA adhesive film in the sample according to a formula 1; or calculating the relative volume resistivity of the EVA adhesive film in the sample according to a formula 2; the formula 1 is that Rho [1]=RS/L=R Rho [density] S<2>/m, and the formula 2 is that Rho [2]=R/m. The testing method has the advantages of being small in measuring error, high in measuring accuracy and easy to operate.

Description

technical field [0001] The invention relates to a volume resistivity test method of an EVA adhesive film used for photovoltaic module packaging, which can also be used for the volume resistivity test of other high volume resistivity materials, and belongs to the measurement technical field. Background technique [0002] In recent years, with the rapid development of the photovoltaic industry, the quality requirements of photovoltaic modules have become higher and higher, and more and more testing items have been tested, such as wet leakage, potential induced decay (PID) and other electrical properties are also key test items, and The packaging material EVA in the component is also an important factor affecting its electrical properties, so there is an urgent need for a more accurate measurement method to characterize the volume resistivity of the EVA film. [0003] At present, the resistance of the EVA film is mainly tested by a high-insulation volume resistivity tester, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 余鹏李伟博乔涛唐舫成汪加胜李文革
Owner GUANGZHOU LUSHAN NEW MATERIALS
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