Visual test method and test device for acetic acid corrosion path of photovoltaic cell

Abstract

The invention provides a photovoltaic cell piece acetic acid corrosion path visualization test method and a test device.The photovoltaic cell piece acetic acid corrosion path visualization test method comprises the following steps that S1, a test solution is prepared, specifically, a fluorescent agent, acetic acid and a solvent are mixed and stirred to be uniform, the mass concentration of the fluorescent agent is 0.1%-1%, the mass concentration of the acetic acid is 0.1%-1%, and the mass concentration of the solvent is 0.1%-1%; the mass concentration of the acetic acid is 1%-5%; s2, under a sealing condition, heating and evaporating the test solution and fumigating the battery piece, and horizontally suspending the battery piece above the liquid level of the test solution; s3, using ultraviolet light to irradiate the area where the battery piece is located during fumigation so as to excite the fluorescent agent to emit light; and S4, image acquisition: acquiring an image of the battery piece in real time through an image acquisition system, wherein the acquisition time interval is 1-5 minutes per time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic cell detection, and particularly relates to a photovoltaic cell acetic acid corrosion path visualization testing method and testing device. BACKGROUND

[0002] In the actual application of photovoltaic modules, the corrosion problem caused by the reaction of cell packaging materials and acetic acid seriously affects the performance and service life of the modules. At present, the traditional acetic acid testing method cannot directly present the corrosion path of acetic acid in the cell, cannot accurately locate the corrosion starting point and diffusion trend, and is not conducive to in-depth study of the corrosion mechanism and optimization of the cell packaging process. Although some patents have involved cell detection visualization technology, there is still no mature solution to realize the visualization of the acetic acid corrosion path by adding a fluorescent agent to the acetic acid solution, and therefore a new testing method and device are urgently needed to solve this problem.

[0003] Therefore, it is necessary to design a photovoltaic cell acetic acid corrosion path visualization testing method and testing device to solve the above problems. SUMMARY

[0004] The present application aims to provide a testing method and testing device that can clearly and intuitively show the acetic acid corrosion path of a photovoltaic cell, realize the visualization of the corrosion path by adding a fluorescent agent to the acetic acid solution and combining specific detection means, and provide a strong basis for analyzing the corrosion mechanism of the cell and improving the packaging process.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a photovoltaic cell acetic acid corrosion path visualization testing method, comprising the following steps: S1, preparing a test solution: mixing and stirring a fluorescent agent, acetic acid and a solvent uniformly, wherein the mass concentration of the fluorescent agent is 0.1%-1%, and the mass concentration of the acetic acid is 1%-5%; S2, under sealed conditions, heating and evaporating the test solution and fumigating the cell, and horizontally suspending the cell above the liquid surface of the test solution; S3, using ultraviolet light to irradiate the area where the cell is located during fumigation to excite the fluorescent agent to emit light; S4, image acquisition: acquiring the image of the cell in real time through an image acquisition system, and the acquisition time interval is 1-5 minutes / time.

[0006] As a further improved technical solution of the present application, in step S1, a magnetic stirrer is used to stir at a speed of 300-500 revolutions / minute for 15-20 minutes to prepare a uniform test solution.

[0007] As a further improved technical solution of the present application, the fluorescent agent is selected from one or more of the coumarin fluorescent agent, fluorescein sodium and rhodamine fluorescent agent. The fluorescent agent is selected according to the following standards: good compatibility with acetic acid solution, and stable luminescence in acetic acid environment, and specific requirements are as follows: stable in acetic acid environment (pH 1-3), fluorescence efficiency decay <5% within 100 hours, meeting the long-time observation requirement; under ultraviolet irradiation (365nm, 300μW / cm²), the fluorescence intensity fluctuation <10%, ensuring the consistency of image acquisition; within the test temperature range (25-90℃), the fluorescence quantum yield change <3%, meeting the accelerated aging experiment requirement.

[0008] As a further improved technical solution of the present application, the fluorescent agent is selected from one or more of the coumarin-3-carboxylic acid, 7-hydroxycoumarin and 7-aminocoumarin.

[0009] As a further improved technical solution of the present application, in step S2, the heating temperature of the test solution is 80-90℃.

[0010] As a further improved technical solution of the present application, in step S3, the ultraviolet light has an illumination intensity of 200-350μW / cm² and a wavelength of 365nm.

[0011] As a further improved technical solution of the present application, the image acquisition system comprises a CCD camera arranged above the battery piece and a computer connected with the CCD camera, and the lens of the CCD camera is 3-7cm away from the surface of the battery piece.

[0012] As a further improved technical solution of the present application, the test method further comprises: step S5, transmitting the collected image to the computer and processing it by using image processing software to clearly display the corrosion path and diffusion of acetic acid on the battery piece.

[0013] To achieve the above-mentioned purposes, the present application adopts the following technical solutions: a test device for implementing the photovoltaic cell acetic acid corrosion path visualization test method described in any one of the above-mentioned embodiments, which comprises a sealed container, a solution tank arranged at the bottom of the sealed container, a heater for heating the test solution in the solution tank, a temperature sensor for regulating the temperature of the test solution, a support frame arranged above the solution tank, an ultraviolet light source and a CCD camera, and the battery piece is horizontally arranged on the support frame.

[0014] As a further improved technical solution of the present application, the solution liquid surface area in the solution tank exceeds the area of the battery piece.

[0015] From the above technical solutions can be known, the photovoltaic cell piece acetic acid corrosion path visual testing method of the present application introduces the fluorescent agent into the acetic acid corrosion test system, combines ultraviolet light excitation fluorescence and real-time image acquisition technology, realizes the visualization and dynamic monitoring of the acetic acid corrosion path, and has the following technical advantages: 1) The fluorescent agent diffuses to the surface of the cell piece with acetic acid vapor, emits fluorescence under ultraviolet light irradiation, can clearly mark the starting point, diffusion direction and spread range of the corrosion path, compared with the traditional test method, the visualization effect is outstanding, provides an intuitive visual basis for studying the acetic acid corrosion mechanism of the cell piece, thereby providing data support for optimizing the packaging materials and process of the photovoltaic cell piece, and improving the corrosion resistance and service life of the photovoltaic module.

[0016] 2) The images are collected at fixed time intervals, real-time dynamic monitoring can continuously record the evolution law of the corrosion process, and provides accurate time sequence data for analyzing the corrosion rate and diffusion mechanism.

[0017] 3) The heating evaporation fumigation method is used to accelerate the corrosion process, combined with a collection interval of 1-5 minutes / time, the complete corrosion path information can be obtained in a short time, and the test efficiency is improved.

[0018] 4) The concentration of the fluorescent agent, the concentration of acetic acid, the heating temperature, the stirring rate and other parameters can be accurately controlled, the controllability of the parameters is strong, and the repeatability and reliability of the test results are ensured.

[0019] 5) The test method of the present application is simple to operate, the test device structure is relatively simple, is suitable for corrosion testing of different types of photovoltaic cell pieces, and has wide product compatibility; and the image data can be further analyzed and processed by image processing software, has strong technical expandability, and can be widely applied to quality detection and research and development work of photovoltaic cell piece production enterprises and research institutions. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the test device in embodiment 1 of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described in detail below with reference to the drawings and specific embodiments. Embodiment 1

[0022] As shown in Figure 1 is a schematic diagram of a photovoltaic cell piece acetic acid corrosion path visualization test device. The test device specifically includes a sealed container 6, a solution tank 5 arranged at the bottom of the sealed container 6, a heater (not shown) for heating the test solution 4 in the solution tank 5, a temperature controller 7 for controlling the temperature of the test solution, a support frame 3 arranged above the solution tank 5, an ultraviolet light source 2, a CCD camera 1 and a main control device 8.

[0023] The material of the sealed container 6 is preferably transparent polycarbonate resistant to acid corrosion, which can accommodate the battery sheet and fluorescent acetic acid solution, and has good sealing property to prevent solution evaporation and external interference. The support frame 3 is used to place the battery sheet to be tested, and the support frame 3 can be set to an adjustable height mode to facilitate adjustment of the distance between the battery sheet and the solution surface. The ultraviolet light source 2 is used to excite the fluorescent agent to emit light, and the wavelength is set at 365 nm, and the illumination intensity can be adjusted, and the illumination intensity ranges from 100 to 500 μW / cm². The ultraviolet light source 2 is arranged on one side or both sides of the chamber of the sealed container 6, and the installation position is higher than the height of the support frame 3, that is, the main illumination area of the ultraviolet light source 2 is the area where the battery sheet is located. The high-resolution CCD camera 1 is installed at a position directly opposite the top of the battery sheet. The image acquisition adopts a high-resolution CCD camera equipped with a macro lens, which can clearly capture the fluorescent images of the surface and interior of the battery sheet, and the camera frame rate is set to 1-10 frames / second, which can record the corrosion process in real time. The main control device 8 is connected with the external computer, the CCD camera 1, the light source 2 and the temperature controller 7, and the control interface of the main control device 8 can control the shooting rhythm of the CCD camera 1, control the heating temperature of the solution through the temperature controller 7, and control the illumination intensity and illumination time of the light source 2. Example 2

[0024] Step 1, mix coumarin-3-carboxylic acid, acetic acid and deionized water, stir at 400 rpm using a magnetic stirrer in a 25°C environment for 15 minutes to prepare a uniform solution, and the mass concentration of coumarin-3-carboxylic acid in the solution is 0.3%, and the mass concentration of acetic acid is 2%.

[0025] Step 2, place the solution in the solution tank of the sealed container, heat to 85°C to evaporate it; horizontally suspend the battery sheet to be tested above the solution surface at a distance of 5 cm, and the solution surface area is 20% larger than the battery sheet.

[0026] Step 3, turn on the ultraviolet light source, adjust the illumination intensity to 250 μW / cm², and continuously irradiate the battery sheet area to fully excite the fluorescent agent to emit light.

[0027] Step 4, image acquisition: the CCD camera takes a picture of the upper surface of the battery sheet (the lens is 5 cm away from the surface of the battery sheet), and an image is collected every 5 minutes. The experimental time is 2 hours.

[0028] Step 5, image processing: the collected images are transmitted to the computer, and ImageJ is used for noise reduction and contrast enhancement processing to clearly show the corrosion path and diffusion of acetic acid on the battery sheet.

[0029] In this embodiment, the image fluorescence track is clear, and it can be observed intuitively that the corrosion starts from the edge defect of the battery piece, gradually spreads along the grid line direction, the edge is slightly corroded around for 20 minutes, the edge corrosion deepens around 50 minutes, and gradually spreads to the middle area, and the fine grid and fishing fork line paste are obviously corroded around 90 minutes. Example 3

[0030] Step 1, 7-hydroxycoumarin, 7-amino coumarin, acetic acid and deionized water were mixed, stirred at 400 rpm / min using a magnetic stirrer in a 25°C environment for 15 minutes to prepare a uniform solution, the mass concentration of 7-hydroxycoumarin in the solution was 0.5%, the mass concentration of 7-amino coumarin was 0.2%, and the mass concentration of acetic acid was 4%.

[0031] Step 2, same as Example 2.

[0032] Step 3, turn on the ultraviolet light source, adjust the light intensity to 250 μW / cm², continuously irradiate the battery piece area, and fully excite the fluorescence agent to emit light.

[0033] Step 4, image acquisition: the CCD camera takes a picture of the upper surface of the battery piece (lens distance from the surface of the battery piece is 5 cm), and an image is collected every 5 minutes. The experimental time is 2 hours.

[0034] Step 5, same as Example 2. Example 4

[0035] Step 1, mix fluorescein sodium, acetic acid and deionized water, stir at 500 rpm / min using a magnetic stirrer in a 25°C environment for 15 minutes to prepare a uniform solution, the mass concentration of fluorescein sodium in the solution is 0.8%, and the mass concentration of acetic acid is 3%.

[0036] Step 2, place the solution in the solution tank of a sealed container, heat to 90°C to evaporate; the battery piece to be tested is horizontally suspended 5 cm above the liquid surface, and the solution liquid surface area is 20% larger than the battery piece.

[0037] Step 3, turn on the ultraviolet light source, adjust the light intensity to 200 μW / cm², continuously irradiate the battery piece area, and fully excite the fluorescence agent to emit light.

[0038] Step 4, image acquisition: the CCD camera takes a picture of the upper surface of the battery piece (lens distance from the surface of the battery piece is 6 cm), and an image is collected every 5 minutes. The experimental time is 2 hours.

[0039] Step 5, same as Example 2. Example 5

[0040] Step 1, mix rhodamine B, coumarin-3-carboxylic acid, acetic acid and deionized water, stir at 500 rpm for 15 minutes at 25°C using a magnetic stirrer to obtain a uniform solution, the mass concentration of rhodamine B in the solution is 0.1%, the mass concentration of coumarin-3-carboxylic acid is 0.6%, and the mass concentration of acetic acid is 2%.

[0041] Step 2, place the solution in the solution tank of a sealed container, heat to 82°C to evaporate; horizontally suspend the battery piece to be tested above the liquid surface at a distance of 5 cm, and the area ratio of the solution liquid surface to the battery piece is 20%.

[0042] Step 3, turn on the ultraviolet light source, adjust the light intensity to 300 μW / cm², and continuously irradiate the battery piece area to fully excite the fluorescence agent to emit light.

[0043] Step 4, image acquisition: the CCD camera takes a picture of the upper surface of the battery piece (lens distance from the surface of the battery piece is 6 cm), and an image is collected every 5 minutes. The experimental time is 2 hours.

[0044] Step 5, same as Example 2. Comparative Example 1 (without fluorescent agent)

[0045] Test conditions: except that the test solution does not contain a fluorescent agent, the remaining parameters are the same as Example 2.

[0046] Results: No corrosion path can be observed under ultraviolet irradiation, and only a faint corrosion area can be judged by the change in the reflection of the surface of the battery piece in the image, and the specific diffusion direction and starting point cannot be determined. After 30 minutes, no effective corrosion signal can be distinguished. Comparative Example 2 (non-sealed fumigation + no ultraviolet irradiation)

[0047] Test conditions: open container fumigation, test solution is coumarin-3-carboxylic acid (0.3%) + acetic acid (2%), no ultraviolet irradiation, and the remaining parameters are the same as Example 2.

[0048] Results: Acetic acid vapor volatilization results in insufficient concentration, slow corrosion rate; no ultraviolet excitation, no fluorescence agent light emission, only a slight discoloration of the surface of the battery piece can be seen in the image, no effective corrosion path marker can be formed, and the collected images have no practical analysis value.

[0049] The specific test results of Examples 2-4 and Comparative Examples 1-2 are shown in Table 1.

[0050] Table 1 Experimental results and analysis data of Example 2-5 and Comparative Examples 1-2.

[0051]

[0052] The above examples are only used for illustrating the present application and not limiting the technical solutions described in the present application. The understanding of the present specification should be based on the skilled in the art. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the skilled in the art can still modify or equivalently replace the present application, and all the technical solutions and improvements which do not deviate from the spirit and scope of the present application should be covered in the scope of claims of the present application.

Claims

1. A method for visually testing the acetic acid corrosion path of photovoltaic cells, characterized in that, The method comprises the following steps: S1, preparing a test solution: mixing and stirring a fluorescent agent, acetic acid and a solvent uniformly, wherein the mass concentration of the fluorescent agent is 0.1%-1%, and the mass concentration of the acetic acid is 1%-5%; S2, under a sealed condition, heating and evaporating the test solution and fumigating the battery piece, the battery piece being horizontally suspended above the liquid surface of the test solution; S3, during the fumigation, irradiating the area where the battery piece is located with ultraviolet light to excite the fluorescent agent to emit light; S4, image acquisition: acquiring the image of the battery piece in real time through an image acquisition system, and the acquisition time interval is 1-5 minutes / time.

2. The photovoltaic cell acetic acid etch path visualization test method of claim 1, wherein: In step S1, a magnetic stirrer is used to stir at a speed of 300-500 revolutions / minute for 15-20 minutes to prepare a uniform test solution.

3. The photovoltaic cell acetic acid etch path visualization test method of claim 1, wherein: The fluorescent agent is selected from one or more of the coumarin fluorescent agents, fluorescein sodium and rhodamine fluorescent agents.

4. The photovoltaic cell acetic acid etch path visualization test method of claim 1, wherein: The fluorescent agent is selected from one or more of coumarin-3-carboxylic acid, 7-hydroxycoumarin and 7-aminocoumarin.

5. The photovoltaic cell acetic acid etch path visualization test method of claim 1, wherein: In step S2, the heating temperature of the test solution is 80-90°C.

6. The photovoltaic cell acetic acid etch path visualization testing method of claim 1, wherein: In step S3, the light intensity of the ultraviolet light is 200-350 μW / cm², and the wavelength is 365 nm.

7. The photovoltaic cell acetic acid etch path visualization testing method of claim 1, wherein: The image acquisition system comprises a CCD camera arranged above the battery piece and a computer connected with the CCD camera, and the lens distance of the CCD camera from the surface of the battery piece is 3-7 cm.

8. The photovoltaic cell acetic acid etch path visualization test method of claim 7, wherein: The test method further comprises: step S5, transmitting the acquired image to the computer and processing it by using image processing software to clearly display the corrosion path and diffusion of the acetic acid on the battery piece.

9. A test device for carrying out the test method according to any one of claims 1 to 8, characterized in that: The device comprises a sealed container, a solution tank arranged at the bottom of the sealed container, a heater for heating the test solution in the solution tank, a temperature sensor for regulating the temperature of the test solution, a support frame arranged above the solution tank, an ultraviolet light source and a CCD camera, and the battery piece is horizontally arranged on the support frame.

10. The test device of claim 9, wherein: The solution liquid surface area in the solution tank exceeds the area of the battery piece.

Images