Method and device for evaluating diffusion of light conversion agent

Abstract

The invention belongs to the technical field of photovoltaic modules, and particularly relates to a method and a device for evaluating diffusion of a light conversion agent. The method comprises the following steps: putting a sample into a closed test environment, and recording position coordinates of an initial boundary of the sample in the test environment; adjusting the heating temperature and the light source wave band in the test environment, and carrying out aging test on the sample according to preset time; irradiating for a preset time under the conditions of a preset heating temperature and a light source wave band, then stopping heating and irradiating, adjusting the light source wave band to be a light conversion agent excitation wave band, and reading a position coordinate corresponding to a light conversion agent diffusion line formed between the common adhesive film and the light conversion adhesive film; the difference value between the position coordinate of the light conversion agent diffusion line and the position coordinate of the initial boundary line is the light conversion agent diffusion distance. By integrating heating, irradiation and measurement systems, the diffusion behavior of the light conversion agent is continuously tested under different conditions, and the device has the advantages of improving the stability of a test environment, reducing personal errors and realizing continuous monitoring.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic components, and in particular relates to a method and a device for evaluating the diffusion of a photoconversion agent. Background Art

[0002] With the rapid development of photovoltaic technology, the encapsulation materials and their performance stability have become key factors affecting the long-term reliability of photovoltaic modules. When photovoltaic modules are exposed to sunlight for long periods of time, the stability of encapsulation films (especially those containing photoconversion agents) in complex environments such as high temperature and light intensity presents significant challenges. The diffusion of photoconversion agents due to concentration gradients in high-temperature environments can lead to degradation of the film's performance, thereby reducing module power generation efficiency. Therefore, accurately evaluating the diffusion behavior of photoconversion agents under different aging conditions is crucial for optimizing encapsulation material design.

[0003] Current testing methods for photoconverter diffusion have significant flaws. Specifically, testers typically heat samples in a high-temperature environment, remove samples at different time points, and then use a handheld UV lamp to observe the diffusion boundary of the photoconverter (photoconverter appears blue under UV light). The diffusion distance is then measured manually using the naked eye and a ruler. In the above-mentioned test method, samples taken out from a high-temperature environment are prone to changes in the material state due to sudden changes in ambient temperature, resulting in deviations between the actual data of the diffusion boundary and the diffusion data under actual working conditions, making it difficult to ensure the repeatability and consistency of the test results. Furthermore, in order to obtain diffusion data under different heating times and temperatures, samples need to be frequently taken out for multiple measurements. This process not only interrupts the continuity of the thermal aging process, but also leads to the accumulation of human errors due to repeated operations, seriously affecting the test efficiency and data accuracy. In addition, when visually interpreting the diffusion boundary, the boundary positioning accuracy is low due to differences in the operator's subjective judgment and fluctuations in the angle and height of the ultraviolet lamp, making quantitative analysis difficult. Finally, in the existing technology, temperature control and light excitation require independent equipment (such as separate settings of the oven and ultraviolet lamp), and the devices need to be frequently switched during the test, which complicates the operation process and makes it difficult to achieve coordinated simulation of temperature and light conditions. Summary of the Invention

[0004] To solve the problems in the above-mentioned background technology, the present invention provides a method and device for evaluating the diffusion of a photoconversion agent, which can detect the diffusion phenomenon caused by the concentration difference of the photoconversion agent in the sample and quantitatively evaluate the impact of different environmental parameters on the diffusion rate.

[0005] The first object of the present invention is to provide a method for evaluating the diffusion of a photoconversion agent, the method comprising the following steps:

[0006] Place the sample in a sealed test environment and record the coordinates of the initial boundary line of the sample in the test environment. The sample is laminated in the order of glass / normal adhesive film & optical transfer adhesive film / glass, and the initial boundary line is formed at the junction of the normal adhesive film and the optical transfer adhesive film.

[0007] Adjust the heating temperature and light source band in the test environment and perform aging tests on the samples according to the preset time;

[0008] After irradiating for a preset time under the conditions of preset heating temperature and light source band, heating and irradiation are stopped, and the light source band is adjusted to the photoconversion agent excitation band. The position coordinates corresponding to the photoconversion agent diffusion line formed between the ordinary adhesive film and the photoconversion adhesive film are read. The difference between the position coordinates of the photoconversion agent diffusion line and the position coordinates of the initial dividing line is the photoconversion agent diffusion distance.

[0009] Furthermore, the heating temperature and the wavelength of the light source in the test environment are adjusted multiple times, and multiple diffusion distances of the photoconversion agent are measured to obtain a diffusion curve of the photoconversion agent.

[0010] Furthermore, the ruler is placed in a closed test environment, and the position coordinates of the initial dividing line are read as reading one on the ruler; after the aging test, the position coordinates corresponding to the photoconversion agent diffusion line are read as reading two on the ruler; and the photoconversion agent diffusion distance is obtained by subtracting reading two from reading one.

[0011] Furthermore, the sample is photographed and recorded in a closed test environment, a first image before the test and a second image after aging are obtained, and the position coordinates of the initial dividing line on the first image and the position coordinates corresponding to the photoconversion agent diffusion line on the second image are read; the difference between the position coordinates of the photoconversion agent diffusion line and the position coordinates of the initial dividing line is the photoconversion agent diffusion distance.

[0012] Furthermore, the sample is infrared marked in a closed test environment. The position coordinates of the initial dividing line are marked by infrared ruler 1, and the position coordinates corresponding to the aged photoconverter diffusion line are marked by infrared ruler 2. The difference between the position coordinates of the photoconverter diffusion line and the position coordinates of the initial dividing line is the photoconverter diffusion distance.

[0013] Further, adjusting the heating temperature to keep the sample heating temperature at a constant preset temperature; adjusting the light source band to keep the sample irradiated under a constant preset light source band; obtaining the diffusion distance of the photoconversion agent under different time periods, and generating a photoconversion agent diffusion curve; or

[0014] Adjusting the heating temperature to maintain the sample's heating temperature at a constant preset temperature; adjusting the light source wavelength at preset time intervals to increase the wavelength of the light source in sequence; obtaining the diffusion distance of the photoconverter under different light source wavelengths, and generating a photoconverter diffusion curve; or

[0015] Adjust the light source band to keep the sample irradiated under a constant preset light source band, adjust the heating temperature every preset time period, and increase the heating temperature in sequence; obtain the diffusion distance of the photoconverter under different temperature conditions, and generate a photoconverter diffusion curve.

[0016] Furthermore, the initial dividing line is a straight line.

[0017] The second object of the present invention is to provide a device for evaluating the diffusion of photoconversion agents.

[0018] It includes a monitoring box, a measuring system, and a heating system and an irradiation system arranged in the monitoring box;

[0019] The heating system includes heating components, which are distributed on the inner wall of the monitoring box;

[0020] The irradiation system is arranged on the top of the monitoring box;

[0021] A sealed door is hinged on one side of the monitoring box, and a sample placement rack is provided at the bottom of the monitoring box; the measuring system includes a ruler, and the ruler is provided at the bottom of the sample placement rack.

[0022] Furthermore, the measurement system also includes a camera located above the sample placement rack and a computer terminal located outside the monitoring box and communicatively connected to the irradiation system and the camera. The irradiation system includes an excitation light source.

[0023] Furthermore, the measurement system also includes a camera, infrared ruler 1, infrared ruler 2 located above the sample placement rack, and a computer terminal located outside the monitoring box and communicatively connected to the camera, infrared ruler 1, infrared ruler 2. The irradiation system includes an excitation light source.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present application provides a method for evaluating the diffusion of a photoconverter. By integrating heating, irradiation, and measurement in a closed test environment, the diffusion behavior of the photoconverter can be continuously tested under different temperatures, different heating times, and different light sources, thereby avoiding measurement errors caused by repeated sample removal. At the same time, quantitative analysis can be achieved by combining a ruler, camera, or infrared measurement technology. This method has the advantages of improving the stability of the test environment, reducing human errors, and achieving continuous monitoring.

[0026] The device proposed in this application integrates a sample holder, heating system, measurement system, and irradiation system to measure the diffusion of photoconverter under different conditions. By accurately simulating actual operating conditions, it provides data support for film material optimization, photoconverter ratio design, and module packaging process improvements, ultimately improving the long-term reliability of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A flow chart of a method for evaluating the diffusion of a photoconversion agent provided in one embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the overall structure of a device for evaluating the diffusion of a photoconversion agent provided by one embodiment of the present invention;

[0030] Figure 3 A sample structure diagram of a sample is provided for one embodiment of the present invention;

[0031] Figure 4 A diagram showing the positional relationship between a sample holder, a sample, and a ruler provided in one embodiment of the present invention;

[0032] Figure 5 A schematic diagram showing the principle of measuring diffusion distance using an infrared ruler according to an embodiment of the present invention;

[0033] Figure 6 This is an example diagram of an application of an infrared ruler for measuring diffusion distance provided by the first embodiment of the present invention;

[0034] Figure 7 This is a diffusion curve of the photoconversion agent under dry heat oxidation conditions at 130°C provided in Example 1 of the present invention;

[0035] Figure 8 This is an example diagram of an infrared ruler used in measuring diffusion distance according to the second embodiment of the present invention;

[0036] Figure 9 This is a diffusion curve diagram of the photoconversion agent under UV aging conditions provided in Example 2 of the present invention;

[0037] Among them: 1-monitoring box, 2-heating system, 3-irradiation system, 31-light source, 4-sample, 41-glass, 42-photoconverter film, 43-ordinary film, 44-photoconverter diffusion area, 5-ruler, 6-camera, 7-computer terminal, 8-infrared ruler 1, 81-infrared ray 1, 9-infrared ruler 2, 91-infrared ray 2, 10-sample placement rack, 11-sealed door. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0039] The following is combined with Figure 1 To the attached Figure 9 The present invention is described in detail with specific embodiments.

[0040] See Figures 1 to 9 The present invention provides a method for evaluating the diffusion of a photoconversion agent, comprising the following steps:

[0041] Place the sample in a sealed test environment and record the coordinates of the initial boundary line of the sample in the test environment. The sample is laminated in the order of glass / ordinary adhesive film & optical transfer adhesive film / glass (see Figure 3 ), and form an initial dividing line at the junction of the ordinary film and the optical transfer film; the initial dividing line is a straight line formed by the close contact between the edges of the two films. Hot pressing or mechanical clamping can be used to ensure that the initial dividing line is straight and clear, ensuring the accuracy of subsequent measurements;

[0042] Adjust the heating temperature and light source band in the test environment and perform aging tests on the samples according to the preset time;

[0043] After irradiating for a preset time at a preset heating temperature and light source wavelength, heating and irradiation are stopped. The light source wavelength is adjusted to the photoconverter excitation wavelength. The coordinates of the photoconverter diffusion line formed between the standard film and the photoconverter film are read. The difference between the coordinates of the photoconverter diffusion line and the coordinates of the initial boundary line is the photoconverter diffusion distance. If the photoconverter excitation wavelength is ultraviolet, the photoconverter will appear blue under ultraviolet light. It is understood that the preset time mentioned above refers to recording the photoconverter diffusion distance at regular intervals, such as every 10 hours, 20 hours, or 24 hours. The specific interval can be set according to actual testing requirements.

[0044] The heating temperature and light source wavelength in the test environment were adjusted multiple times, and multiple diffusion distances of the photoconverter were measured to obtain a photoconverter diffusion curve.

[0045] In the method of this application, when preparing sample 4, the seamless connection between conventional adhesive film 43 and photoconverter adhesive film 42 is ensured to form a clear initial demarcation line, providing a reference for subsequent diffusion distance measurements. Sample 4 is placed in a sealed test environment and maintained at a constant temperature to simulate real-world aging conditions. Light exposure in a preset wavelength band is provided to accelerate the diffusion of the photoconverter. Specific aging adjustment parameters can be set based on actual operating conditions. During the test, sample 4 does not need to be removed. The built-in irradiation system 3 directly switches to the photoconverter excitation wavelength band (e.g., the ultraviolet band) to stimulate the photoconverter's color development. A measurement system, such as a ruler 5 or image acquisition device, records the position of the initial demarcation line and the diffusion boundary. After adjusting the temperature or illumination parameters multiple times according to research requirements, diffusion distance data under different conditions is obtained and a graph is generated, revealing the correlation between the diffusion pattern of the photoconverter and external conditions. This method achieves the synergistic effect of temperature and light through integrated temperature, light and closed test environment, avoiding interruption of test conditions. At the same time, closed in-situ measurement is used to eliminate the influence of temperature fluctuations to ensure stable aging conditions. Traditional single parameter adjustment is difficult to simulate complex working conditions, but this method can realize dynamic combined control of temperature and light bands, which can simulate a variety of actual working conditions and improve the objectivity of the results.

[0046] Furthermore, the ruler is placed in a closed test environment, and the position coordinates of the initial dividing line are read as reading one on the ruler; after the aging test, the position coordinates corresponding to the photoconversion agent diffusion line are read as reading two on the ruler; and the photoconversion agent diffusion distance is obtained by subtracting reading two from reading one.

[0047] Specifically, when the device is placed in the monitoring box 1, the coordinates of the initial boundary between the conventional adhesive film 43 and the photoconverter film 42 are read on the scale 5 as a first reading. The sample 4 is sealed in the monitoring box 1 and continuously heated and irradiated, with the scale 5 and sample 4 maintained in a fixed relative position. Once the sample 4 is in place, the initial boundary is directly read on the scale 5 as a reference value to establish the spatial coordinate origin. The coordinates of the diffusion distance line of the photoconverter after aging are read on the scale 5 as a second reading. The diffusion distance of the photoconverter in the conventional adhesive film 43 is obtained by subtracting the second reading from the first reading. Specifically, after aging, there is no need to open the monitoring box 1 to remove the sample 4. The boundary position after diffusion is directly read on the scale 5 in the monitoring box 1, and the difference between the two readings is used to determine the diffusion distance.

[0048] It should be noted that Reading 1 and Reading 2 are the scale values ​​corresponding to the initial dividing line and the diffusion distance line on the indicator scale 5. This can be achieved through visual alignment or automatic capture by a photoelectric sensor, or through manual calculation after manual recording or automatic processing by a computer terminal. This process converts the fuzzy judgment of the diffusion boundary into a numerical quantitative analysis, effectively eliminating the operator's subjective judgment differences. By integrating a fixed scale 5 within the closed monitoring box 1, this method achieves in-situ calibration of the diffusion boundary, maintaining the stability of the test environment and ensuring the continuity of the diffusion process. At the same time, the boundary position is converted into the scale reading difference, eliminating the operator's subjective positioning deviation and making the measurement results repeatable and quantitative.

[0049] Furthermore, the sample is photographed and recorded in a closed test environment, a first image before the test and a second image after aging are obtained, and the position coordinates of the initial dividing line on the first image and the position coordinates corresponding to the photoconversion agent diffusion line on the second image are read; the difference between the position coordinates of the photoconversion agent diffusion line and the position coordinates of the initial dividing line is the photoconversion agent diffusion distance.

[0050] Specifically, in conjunction with the device, the measurement system in the monitoring box 1 includes a camera 6 located above the sample 4 and a computer terminal 7 located outside the monitoring box 1 and communicatively connected to the irradiation system 3 and the camera 6; wherein, the camera 6 is installed directly above the sample 4 and can be implemented using an industrial camera with high resolution. The camera 6 can be used to capture the image of the diffusion boundary of the photoconverter in the photoconverter excitation band; the computer terminal 7 is used to control the opening and closing of the excitation light source, receive image data collected by the camera 6 and execute image analysis algorithms.

[0051] Computer terminal 7 is operated to activate camera 6 and an excitation light source. Data on the diffusion distance of the photoconverter in the conventional adhesive film 43 is collected using computer terminal 7. Camera 6 also records a first image of sample 4 before testing and a second image after aging. Specifically, when irradiation system 3 switches to the photoconverter excitation wavelength, computer terminal 7 simultaneously activates the excitation light source and triggers camera 6 to capture an image of the sample 4's appearance. The photoconverter diffused in the conventional adhesive film 43 forms a development boundary under the photoconverter excitation wavelength. Camera 6 captures the image of this boundary and transmits it to computer terminal 7. Computer terminal 7 uses an image processing algorithm to identify the location of the development boundary and calculates the precise value of the diffusion distance using preset pixel calibration parameters. During this process, the fixed mounting position of camera 6 and the excitation light source eliminates measurement errors caused by manual operation due to variations in the light source angle or height. Automatic processing of image data by computer terminal 7 avoids subjective bias in visual interpretation. The method of the present application achieves automated measurement of the photoconverter diffusion distance, eliminating errors caused by manual operation due to variations in light source position and subjective judgment, thereby ensuring consistent and repeatable data collection. Furthermore, the real-time processing of the image data by the computer terminal 7 reduces the human intervention link, avoids the influence of temperature fluctuation caused by repeated removal of the sample during the measurement process, and makes the test results more realistically reflect the diffusion behavior under actual working conditions.

[0052] Furthermore, the sample is infrared marked in a closed test environment. The position coordinates of the initial dividing line are marked by infrared ruler 1, and the position coordinates corresponding to the aged photoconverter diffusion line are marked by infrared ruler 2. The difference between the position coordinates of the photoconverter diffusion line and the position coordinates of the initial dividing line is the photoconverter diffusion distance.

[0053] Specifically, the sample 4 is placed in the monitoring box 1, and the infrared ruler 1 8 and the infrared ruler 2 9 are turned on through the computer terminal 7. The infrared ruler 1 8 is used to clearly mark the initial dividing line between the ordinary film 43 and the optical transfer film 42, which is defined as infrared ray 1 81; the infrared ruler 1 8 refers to a device that uses an infrared ranging sensor to perform non-contact positioning of the initial dividing line on the surface of the sample 4, which can be specifically achieved by using a laser infrared sensor with millimeter-level resolution.

[0054] The diffusion distance line of the photoconverter after aging is clearly marked using infrared ruler 2 (9), defined as infrared ruler 2 (91). Infrared ruler 2 (9) is an infrared distance measuring device used to calibrate the diffusion distance line after aging. It uses the same coordinate system as infrared ruler 1. After the aging stage, this device automatically activates to capture the offset position of the diffusion boundary of the photoconverter diffusion area 44. A computer terminal is used to activate camera 6 and the excitation light source. Computer terminal 7 collects data on the diffusion distance of the photoconverter in the conventional adhesive film 43, and camera 6 records the appearance of sample 4. Computer terminal 7 receives the infrared ruler's positioning data and synchronously triggers the excitation light source and camera 6 to achieve timing control of the measurement operation.

[0055] When sample 4 is placed within monitoring chamber 1, infrared ruler 1 (8) scans the surface of sample 4 by emitting an infrared beam, determining the coordinates of the initial boundary between conventional adhesive film 43 and photoconverter film 42. This coordinate data is transmitted in real time to a computer terminal, forming a baseline reference value. After the aging test is completed, infrared ruler 2 (9) performs a second scan of the diffused boundary to obtain the coordinates of the photoconverter diffusion line. By calculating the difference between the two scans, the photoconverter diffusion distance is automatically determined. During this process, computer terminal 7 synchronously activates the excitation light source according to a preset program, causing the photoconverter in conventional adhesive film 43 to develop within the photoconverter excitation wavelength band. Simultaneously, camera 6 is triggered to capture an image of the sample. The image data and infrared positioning data are integrated and analyzed, forming a dual verification mechanism for visual and spatial data. The non-contact nature of the infrared distance measurement device avoids measurement errors caused by human touch. The automated control of the measurement process by computer terminal 7 reduces the number of interruptions and ensures the continuity of aging conditions. The cross-validation mechanism between camera 6 and infrared data improves the reliability of diffusion distance calculations, while achieving a fully enclosed testing process and effectively maintaining sample stability within the testing environment.

[0056] Furthermore, the sample is placed in the test environment so that the initial dividing line between the conventional film and the optical transfer film is perpendicular to the observation plane. It is understood that users typically observe from directly in front of the monitoring box 1, using the front as the observation plane. By setting the initial dividing line perpendicular to the observation plane, image distortion or reading errors caused by angular deviation can be avoided.

[0057] Specifically, the device also includes a sample rack 10 located in the monitoring box 1, and two limit blocks with adjustable distance are provided on the sample rack 10; the sample rack 10 is used to fix the sample 4, and can be implemented by a metal frame with a guide rail, and the distance adjustment is achieved through the sliding cooperation between the guide rail and the limit block, so that the sample rack 10 can adapt to samples of different sizes.

[0058] Place the sample 4 between the two limit blocks of the sample holder 10, and adjust the two limit blocks to clamp the sample 4 so that the initial dividing line between the ordinary adhesive film 43 and the optical transfer adhesive film 42 is perpendicular to the observation surface. The initial dividing line being perpendicular to the observation surface means that the seam direction of the ordinary adhesive film 43 and the optical transfer adhesive film 42 in the sample 4 forms a 90° angle with the observation direction of the optical measurement system, ensuring that the dividing line remains perpendicular to the scale or the imaging plane of the camera. When the sample 4 is placed between the two limit blocks of the sample holder 10, adjust the limit blocks to apply a clamping force to both sides of the sample 4 so that the sample 4 does not undergo horizontal displacement during the heating and irradiation process; and by adjusting the spacing between the limit blocks, it can adapt to samples of different sizes and eliminate installation errors caused by differences in sample width. During the clamping process, the inner plane of the limit block contacts the edge of the sample 4, forcing the dividing line to form a vertical state through mechanical constraints. When the camera or ruler observes the dividing line, the vertical positioning ensures that the measurement reference line is aligned with the axis of the optical system, avoiding image distortion or reading errors caused by angular deviation. This scheme eliminates the measurement deviation of the diffusion boundary caused by sample displacement or tilt, and solves the positioning compatibility problem of samples of different sizes.

[0059] In some embodiments, the heating temperature is adjusted to maintain the heating temperature of the sample 4 at a constant preset temperature; the light source band is adjusted to maintain the sample irradiated under a constant preset light source band; the diffusion distance of the photoconverter in the ordinary adhesive film 43 at different times is obtained, and a photoconverter diffusion curve is generated; by continuously irradiating the sample 4 in the closed monitoring box 1 under constant temperature and fixed band conditions, the irradiation parameters are automatically switched at preset time intervals every preset time period, and the measurement system records the diffusion distance data at time intervals through the automatic acquisition module, thereby avoiding the temperature change and test interruption caused by removing the sample in the traditional method.

[0060] In some other embodiments, the heating temperature is adjusted to maintain the heating temperature of the sample 4 at a constant preset temperature; the light source band is adjusted at preset time intervals so that the light source band increases in sequence; the diffusion distance of the photoconversion agent in the ordinary adhesive film under different light source bands is obtained, and a photoconversion agent diffusion curve is generated; when it is necessary to simulate the influence of different spectra on the diffusion of the photoconversion agent, the system periodically switches the light source band through a preset program on the basis of maintaining a constant temperature, for example, switching the light source band once every 10 hours, and simultaneously collecting the diffusion data corresponding to each band in real time. After the data collection is completed, the computer terminal 7 performs curve fitting on the band parameters and the corresponding diffusion distance to generate a photoconversion agent diffusion curve.

[0061] In other embodiments, the light source wavelength is adjusted to maintain the sample 4 irradiated at a constant, preset wavelength. The heating system 2 is then adjusted to increase the heating temperature at preset intervals. The diffusion distance of the photoconverter in the conventional adhesive film 43 at different light temperatures is measured and a photoconverter diffusion curve is generated. For temperature gradient studies, the system, after fixing the light source wavelength, gradually adjusts the heating temperature by increasing it by 10°C. For example, starting from 50°C and increasing the temperature to 60°C, 70°C, 80°C, 90°C, and 100°C every 20 hours, automatically recording the diffusion distance at each temperature point. After data collection is complete, a computer terminal performs a curve fit between the time, temperature, or wavelength parameters and the corresponding diffusion distances to generate a photoconverter diffusion curve.

[0062] The method of the present application solves the problem of data distortion caused by test interruption, and obtains diffusion data that is closer to the actual working conditions through continuous monitoring; it reduces subjective errors and improves test efficiency by replacing manual operations with automated parameter adjustment; and by separating and controlling temperature and light source band variables, it can independently analyze the influence of a single parameter on diffusion behavior, providing multi-dimensional experimental data support for optimizing the performance of film materials.

[0063] Furthermore, the ordinary adhesive film 43 and the photoconverter adhesive film 42 are of the same size, and the initial dividing line is a straight line. The ordinary adhesive film 43 and the photoconverter adhesive film 42 of the same size can be achieved using a standard mold cutting or laser cutting process to ensure that the contact surfaces of the two are completely aligned after lamination. The initial dividing line is a straight line, which can be achieved through a positioning fixture and other processes so that the initial dividing line forms a regular geometric boundary inside the sample. The straight initial dividing line serves as a baseline reference line after lamination, forming a clear diffusion boundary contrast under the excitation band of the photoconverter, which facilitates single-dimensional linear measurement using a ruler or optical equipment. The standardized geometric benchmark thus established allows the subsequent quantitative analysis of the diffusion distance to only require data collection along a single direction, avoiding random errors caused by the need for multi-point fitting calculations of the curve boundary.

[0064] The present invention is demonstrated below with two specific embodiments.

[0065] Example 1

[0066] Test purpose: To test the stability of the photoconverter under high temperature conditions and verify whether the photoconverter can be transferred from the photoconverter film 42 to the ordinary film 43 under high temperature conditions;

[0067] The test method is:

[0068] Place sample 4 in the order of glass 41 / optical transfer adhesive film 42 & ordinary adhesive film 43 / glass 41 and laminate them. The ordinary adhesive film 43 and the optical transfer adhesive film 42 are seamlessly connected in the horizontal direction to form an initial dividing line.

[0069] Place the sample 4 into the monitoring box 1, make the initial dividing line at a position convenient for the measurement system to test, and then close the monitoring box 1;

[0070] The heating temperature and light source wavelength were adjusted to keep sample 4 under dry heat oxidation conditions at 130°C. The diffusion distance was automatically recorded every 24 hours, and the diffusion distances at six time points were recorded to form a diffusion curve of the photoconverter under dry heat oxidation conditions at 130°C. Figure 6 At one of the time nodes, the position of the initial dividing line and the photoconverter diffusion distance line after aging, the interval between the two red lines is the photoconverter diffusion distance. Figure 7 This is the diffusion curve of the photoconverter showing the relationship between heating time and diffusion distance after fitting.

[0071] Test results:

[0072] At 130℃ / 144h, the photoconverter showed a 15mm diffusion phenomenon.

[0073] Example 2

[0074] Test purpose: To test the stability of the photoconverter under UV aging conditions and verify whether the photoconverter will transfer from the photoconverter film 42 to the ordinary film 43 under UV irradiation conditions;

[0075] The test method is:

[0076] Place sample 4 in the order of glass 41 / optical transfer adhesive film 42 & ordinary adhesive film 43 / glass 41 and laminate them. The ordinary adhesive film 43 and the optical transfer adhesive film 42 are seamlessly connected in the horizontal direction to form an initial dividing line.

[0077] Place the sample 4 into the monitoring box 1, make the initial dividing line at a position convenient for the measurement system to test, and then close the monitoring box 1;

[0078] The wavelength of the light source was adjusted so that sample 4 was placed under UV0, UV30, UV60, and UV90 conditions in sequence; each condition was maintained for 24 hours, and the diffusion distances of the four nodes were recorded to form a diffusion curve of the photoconverter under UV aging conditions. Figure 8 It is the position of the initial dividing line and the position of the photoconverter diffusion distance line after UV90 aging under UV90 aging conditions. The interval between the two red lines is the photoconverter diffusion distance. Figure 9 The diffusion curves of the photoconverter at different aging stages and diffusion distances after fitting.

[0079] Test results:

[0080] After UV90, the photoconverter showed a 9mm diffusion phenomenon.

[0081] In summary, the method described in this application can generate diffusion curves of the photoconverter from the photoconverter film 42 to the conventional film 43 under different temperatures, heating times, and light sources. This allows inferring the stability of the photoconverter film 42 in photovoltaic modules under varying heating temperatures, heating times, and light sources. By accurately simulating actual operating conditions, this method provides data support for optimizing film materials, designing photoconverter ratios, and improving module packaging processes, ultimately enhancing the long-term reliability of modules.

[0082] See Figures 2 to 5 The present invention also provides a device for evaluating the diffusion of a photoconverter, comprising a monitoring box 1, a measurement system, and a heating system 2 and an irradiation system 3 arranged in the monitoring box 1. A sealed door 11 is hinged on one side of the monitoring box 1, and a sample placement rack 10 is provided at the bottom of the monitoring box 1.

[0083] The monitoring box 1 of the present application is a box structure with a closed space, which is used to isolate external environmental interference. It can be made of stainless steel or high-temperature resistant polymer materials, but is not limited to this; and an insulation layer is provided on the inner wall of the monitoring box 1 to maintain temperature stability; the heating system 2 is used to control the temperature environment in which the sample is located. The heating system 2 can use heating components such as resistance heating plates or infrared heating tubes, and the heating components are evenly distributed on the inner wall of the monitoring box 1 to ensure that the temperature inside the monitoring box 1 is consistent; the irradiation system 3 is a light source 31 with an adjustable band, and the light source emitted by the light source 31 covers the range of visible light to ultraviolet light.

[0084] See Figure 1 and Figure 4 The measurement system includes a ruler 5 located below the sample 4. The ruler 5 is arranged at the bottom of the sample placement rack 10 and is placed parallel to the sample 4. Optionally, the ruler 5 can be implemented by a metal ruler with a millimeter scale (such as the distance between the scale lines is 0.5mm) or a laser scale device; the present application preferably uses a metal ruler with a millimeter scale with a simpler structure; setting the ruler 5 in the monitoring box 1 can provide a stable spatial coordinate reference, so that the interpretation of the initial dividing line and the diffusion distance line is converted into a numerical position comparison, eliminating the subjective error of naked eye positioning.

[0085] Furthermore, the device also includes a sample rack 10 located in the monitoring box 1, and two limit blocks with adjustable distance are provided on the sample rack 10; the sample rack 10 is used to fix the sample 4, and can be implemented by a metal frame with a guide rail, and the distance adjustment is achieved through the sliding cooperation between the guide rail and the limit block, so that the sample rack 10 can adapt to samples of different sizes.

[0086] Furthermore, the measurement system also includes a camera 6 located above the sample placement rack 10 and a computer terminal 7 located outside the monitoring box 1 and communicatively connected to the irradiation system 3 and the camera 6. The irradiation system 3 includes an excitation light source.

[0087] Furthermore, the measurement system also includes a camera 6, an infrared ruler 1 8, an infrared ruler 2 9 located above the sample placement rack 10, and a computer terminal 7 located outside the monitoring box 1 and communicatively connected to the camera 6, infrared ruler 1 8, and infrared ruler 2 9. The irradiation system 3 includes an excitation light source.

[0088] The device of the present application is used to detect the diffusion phenomenon caused by the concentration difference of the photoconverter in the photovoltaic module, quantitatively evaluate the influence of different environmental parameters on the diffusion rate, and has good repeatability and reproducibility. The heating system can simulate the actual working temperature of the sample to realize gradient testing; the measurement system can effectively solve the data errors caused by the test techniques of the testers, effectively save time, and improve the accuracy, repeatability and reproducibility of the test data; the irradiation system can control the irradiation intensity and spectral distribution of the light source system to reproduce the stability of the photoconverter under different lighting conditions. The technical effects brought about by the above-mentioned specific technical solutions are specifically described in the method for evaluating the diffusion of photoconverters, and will not be repeated here.

[0089] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A method for evaluating the diffusion of a photoconversion agent, characterized in that: The method comprises the following steps: Place the sample in a sealed test environment and record the coordinates of the initial boundary line of the sample in the test environment. The sample is laminated in the order of glass / normal adhesive film & optical transfer adhesive film / glass, and the initial boundary line is formed at the junction of the normal adhesive film and the optical transfer adhesive film. Adjust the heating temperature and light source band in the test environment and perform aging tests on the samples according to the preset time; After irradiating for a preset time under the conditions of preset heating temperature and light source band, heating and irradiation are stopped, and the light source band is adjusted to the photoconversion agent excitation band. The position coordinates corresponding to the photoconversion agent diffusion line formed between the ordinary adhesive film and the photoconversion adhesive film are read. The difference between the position coordinates of the photoconversion agent diffusion line and the position coordinates of the initial dividing line is the photoconversion agent diffusion distance.

2. The method for evaluating the diffusion of a photoconversion agent according to claim 1, wherein: The heating temperature and light source wavelength in the test environment were adjusted multiple times, and multiple diffusion distances of the photoconverter were measured to obtain a photoconverter diffusion curve.

3. The method for evaluating the diffusion of a photoconversion agent according to claim 1, wherein: The method further includes: placing a ruler in a closed test environment, reading a first reading on the ruler of the position coordinates of the initial dividing line; reading a second reading on the ruler of the position coordinates corresponding to the light-conversion agent diffusion line after the aging test; and obtaining the light-conversion agent diffusion distance by subtracting the second reading from the first reading.

4. The method for evaluating the diffusion of a photoconversion agent according to claim 1, wherein: The method further includes: photographing and recording the sample in a closed test environment, obtaining a first image before the test and a second image after aging, reading the position coordinates of the initial dividing line on the first image and the position coordinates corresponding to the photoconversion agent diffusion line on the second image; the difference between the position coordinates of the photoconversion agent diffusion line and the position coordinates of the initial dividing line is the photoconversion agent diffusion distance.

5. The method for evaluating the diffusion of a photoconversion agent according to claim 1, wherein: The method further includes: infrared marking the sample in a closed test environment, marking the position coordinates of the initial dividing line using a first infrared ruler, marking the position coordinates corresponding to the aged light conversion agent diffusion line using a second infrared ruler, and the difference between the position coordinates of the light conversion agent diffusion line and the position coordinates of the initial dividing line is the light conversion agent diffusion distance.

6. The method for evaluating the diffusion of a photoconversion agent according to claim 2, wherein: The method further comprises: Adjusting the heating temperature to keep the sample's heating temperature at a constant preset temperature; adjusting the light source wavelength to keep the sample irradiated at a constant preset light source wavelength; obtaining the diffusion distance of the photoconversion agent at different time periods, and generating a photoconversion agent diffusion curve; or Adjusting the heating temperature to maintain the sample's heating temperature at a constant preset temperature; adjusting the light source wavelength at preset time intervals to increase the wavelength of the light source in sequence; obtaining the diffusion distance of the photoconverter under different light source wavelengths, and generating a photoconverter diffusion curve; or Adjust the light source band to keep the sample irradiated under a constant preset light source band, adjust the heating temperature every preset time period, and increase the heating temperature in sequence; obtain the diffusion distance of the photoconverter under different temperature conditions, and generate a photoconverter diffusion curve.

7. The method for evaluating the diffusion of a photoconversion agent according to any one of claims 1 to 6, characterized in that: The initial dividing line is a straight line.

8. A device for evaluating the diffusion of a photoconversion agent, characterized in that: It includes a monitoring box, a measuring system, and a heating system and an irradiation system arranged in the monitoring box; The heating system includes heating components, which are distributed on the inner wall of the monitoring box; The irradiation system is arranged on the top of the monitoring box; A sealed door is hinged on one side of the monitoring box body, and a sample placement rack is provided at the bottom of the monitoring box body; the measurement system includes a ruler, and the ruler is provided at the bottom of the sample placement rack.

9. The device for evaluating the diffusion of a photoconversion agent according to claim 8, characterized in that: The measurement system further includes a camera located above the sample placement rack and a computer terminal located outside the monitoring box and communicatively connected to the irradiation system and the camera.

10. The device for evaluating the diffusion of a photoconversion agent according to claim 8, characterized in that: The measurement system further includes a camera, a first infrared ruler, a second infrared ruler, which are located above the sample placement rack, and a computer terminal which is located outside the monitoring box and is in communication with the camera, the first infrared ruler, and the second infrared ruler.

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