Adhesive film sample manufacturing method, adhesive film sample and adhesive film damp-heat aging resistance evaluation method

Abstract

The invention relates to the technical field of photovoltaics, and discloses an adhesive film sample manufacturing method, an adhesive film sample and an adhesive film damp-heat aging resistance evaluation method. In the invention, since the adhesive film sample only comprises the laminated bare chip photovoltaic battery piece and the adhesive film, in the process of carrying out the adhesive film damp-heat aging resistance evaluation method, extreme conditions are directly simulated to carry out damp-heat aging resistance evaluation on the adhesive film sample, so that the influence on test time prolonging caused by relatively good water resistance of glass in the test process is reduced; therefore, the damp-heat aging resistance of the adhesive film can be directly evaluated, and the time required for evaluating the damp-heat aging resistance of the adhesive film is greatly shortened; moreover, the adhesive film and the glass are separated through the isolating layer before lamination, so that the adhesive film is not adhered to the glass in the lamination process of the to-be-laminated structure, the glass and the adhesive film can be quickly separated to obtain an adhesive film sample, the adhesive film sample is kept to be molded, and the subsequent direct damp-heat aging resistance evaluation on the adhesive film sample is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and particularly relates to a method for manufacturing a film sample, a film sample, and a method for evaluating the damp heat aging resistance of the film. Background Art

[0002] When current mainstream photovoltaic modules (such as TOPCon, HJT) operate outdoors for a long time, they generally face the problem of water vapor infiltration at the edges of the modules. Since the module adopts a sandwich structure of glass, film, battery, film, and glass, the zero water vapor permeability of the glass makes water vapor mainly enter the interior through the edge sealant. After the water vapor infiltrates, the ester functional groups in the encapsulation film (such as EVA, EPE) are prone to hydrolysis reactions, generating corrosive substances such as acetic acid. Acetic acid will further erode the electrode material of the battery chip, resulting in a significant decrease in the power generation efficiency of the module. In severe cases, it may even cause short circuits or hot spot effects, ultimately leading to the failure of the module.

[0003] In related technologies, the methods for evaluating the damp heat resistance of the film mainly include two categories: one is to encapsulate the film into a module and then conduct a DH1000 test at 85°C / 85%RH for 1000 hours to monitor the attenuation of electrical performance; the other is to make small samples of the film and then carry out a high-pressure water boiling (PCT) test at 121°C / 100%RH to analyze the degradation behavior of the material. However, the inventors found that there are at least the following problems in the related technologies: due to the good water blocking performance of the glass, water vapor can only slowly penetrate through the edges of the module. Therefore, the conventional damp heat aging test of the film takes more than a thousand hours and is difficult to quickly evaluate the long-term reliability of the material. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a method for manufacturing a film sample, a film sample, and a method for evaluating the damp heat aging resistance of the film. By optimizing the structure of the sample to be tested, it is possible to directly test the sample encapsulated with the film, greatly shortening the time required for the damp heat aging test of the film and achieving a rapid evaluation of the damp heat aging of the film.

[0005] To solve the above technical problems, an embodiment of the present invention provides a method for manufacturing a film sample, including: obtaining a photovoltaic cell chip, where the photovoltaic cell chip is a bare chip; encapsulating the photovoltaic cell chip into a film, and the film completely covers the front, back, and edges of the photovoltaic cell chip; setting an isolation layer on the surface of the film, where the isolation layer is used to isolate the film and the glass; fitting and setting the glass on the surface of the isolation layer to obtain a structure to be laminated; laminating the structure to be laminated; removing the isolation layer and the glass to obtain the film sample.

[0006] An embodiment of the present invention also provides a film sample, comprising: a laminated photovoltaic cell and a film; wherein, the photovoltaic cell is a bare chip cell; the film completely covers the front, back and edges of the photovoltaic cell.

[0007] An embodiment of the present invention also provides a method for evaluating the damp heat aging resistance of a film, comprising: obtaining a film sample; the film sample is prepared by the above-mentioned film sample preparation method; placing the film sample in water for steaming; during the steaming process, detecting the film sample at preset time intervals to obtain the damp heat characteristic data of the film sample.

[0008] In the embodiment of the present invention, since the film sample only comprises a laminated bare chip photovoltaic cell and a film, during the process of the method for evaluating the damp heat aging resistance of the film, directly simulating extreme conditions to evaluate the damp heat aging resistance of the film sample reduces the influence on the extension of the test time caused by the good waterproof performance of the glass during the test process, so that the damp heat aging resistance of the film can be directly evaluated, greatly shortening the time required for evaluating the damp heat aging resistance of the film; and, since the film and the glass are blocked by an isolation layer before lamination, during the lamination process of the structure to be laminated, the film will not adhere to the glass, and the glass and the film can be quickly separated to obtain the film sample, and the film sample can be kept formed, which is convenient for directly evaluating the damp heat aging resistance of the film sample subsequently.

[0009] In addition, the setting of the isolation layer on the surface of the film comprises: setting a first sub-isolation layer on the outer surface of the film corresponding to the front of the photovoltaic cell; setting a second sub-isolation layer on the outer surface of the film corresponding to the back of the photovoltaic cell; the outer sides of the film corresponding to the front and back of the photovoltaic cell are both the sides far from the photovoltaic cell; the setting of the glass on the surface of the isolation layer comprises: setting the glass on the outer sides of the first sub-isolation layer and the second sub-isolation layer respectively; the outer sides of the first sub-isolation layer and the second sub-isolation layer are both the sides far from the photovoltaic cell.

[0010] In addition, the material of the isolation layer is an organic substance. In this application, through the isolation layer made of an organic substance, the film and the glass can be effectively isolated, which is convenient for separating the glass and the isolation layer after lamination.

[0011] In addition, the material of the isolation layer is PET material, and silicone oil is coated on both sides of the isolation layer. In this application, by setting the isolation layer made of PET material and coating silicone oil on both sides of the isolation layer, the isolation layer is not easy to adhere to the film and the glass, which is convenient for separating the glass and the isolation layer after lamination.

[0012] In addition, the lamination of the structure to be laminated includes: placing the structure to be laminated at a temperature of 85°C to 165°C and laminating it at a pressure of 0.1 MPa to 0.3 MPa for 3 minutes to 25 minutes.

[0013] In addition, the cooking environment of the film sample is deionized water at 45°C to 120°C. In this application, by directly cooking the film sample in deionized water, extreme damp-heat aging conditions are provided for the film sample, and the film sample is directly exposed to high-temperature and high-humidity conditions, which is beneficial to accelerating the aging of the film sample, thereby achieving rapid evaluation of damp-heat aging resistance.

[0014] In addition, the detection of the film sample at intervals of a preset time duration includes: at each interval of the preset time duration, detecting the color difference, appearance, and electrical properties of the film sample once, and recording the detection results until the film sample is damaged.

[0015] In addition, the preset time duration is determined according to the waterproof characteristic type of the film, and the waterproof characteristic type includes a high-strength type and a low-strength type; when the waterproof characteristic type of the film is the high-strength type, the preset time duration is 20 hours to 72 hours; when the waterproof characteristic type of the film is the low-strength type, the preset time duration is 3 hours to 15 hours. Since the film is directly placed under high-temperature and high-humidity conditions for cooking in this application, the aging speed of the film is accelerated, thus shortening the time interval for detection; moreover, by setting different detection preset time durations for different waterproof characteristic types of film samples in this application, it is beneficial to flexibly adjust the test time duration according to the waterproof characteristic type of the film sample, and improve the adaptability of the damp-heat aging resistance evaluation method of the film to different waterproof characteristic types of films. Description of the Drawings

[0016] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise stated, and the drawings in the figures do not constitute a scale limitation.

[0017] Figure 1 is a flowchart of a method for manufacturing a film sample in an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of the split structure of a structure to be laminated in an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of the combined structure of a structure to be laminated in an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of the structure of a film sample in an embodiment of the present application;

[0021] Figure 5 It is a flowchart of the method for evaluating the damp heat aging resistance of the adhesive film in an embodiment of the present application. Detailed implementation manners

[0022] Since the water barrier performance of glass is relatively good and water vapor can only slowly penetrate through the edges of the component, the conventional damp heat aging test of the adhesive film takes more than a thousand hours and it is difficult to quickly evaluate the long-term reliability of the material. Therefore, a method for manufacturing an adhesive film sample, an adhesive film sample and a method for evaluating the damp heat aging resistance of the adhesive film are needed to solve the above technical problems.

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required to be protected by the present application can still be implemented. The following division of each embodiment is for convenience of description and should not constitute any limitation on the specific implementation manner of the present invention. Each embodiment can be combined and cross-referenced with each other without conflict.

[0024] An embodiment of the present invention relates to a method for manufacturing an adhesive film sample, which can be applied to pre-manufacture an adhesive film sample in the method for evaluating the damp heat aging resistance of the adhesive film. The method for manufacturing the adhesive film sample includes: obtaining a photovoltaic cell, where the photovoltaic cell is a bare chip cell; encapsulating the photovoltaic cell into an adhesive film, and the adhesive film completely covers the front, back and edges of the photovoltaic cell; setting an isolation layer on the surface of the adhesive film, and the isolation layer is used to isolate the adhesive film and the glass; fitting and setting the glass on the surface of the isolation layer to obtain a to-be-laminated structure; laminating the to-be-laminated structure; removing the isolation layer and the glass to obtain the adhesive film sample. Since the adhesive film sample only includes the laminated bare chip photovoltaic cell and the adhesive film, during the process of the method for evaluating the damp heat aging resistance of the adhesive film, the extreme conditions are directly simulated to evaluate the damp heat aging resistance of the adhesive film sample, reducing the influence of the good waterproof performance of the glass on the extension of the test time during the test process, so that the damp heat aging resistance of the adhesive film can be directly evaluated, greatly shortening the time required for the damp heat aging evaluation of the adhesive film; and, since the adhesive film and the glass are blocked by the isolation layer before lamination, during the lamination process of the to-be-laminated structure, the adhesive film will not adhere to the glass, and the glass and the adhesive film can be quickly separated to obtain the adhesive film sample and keep the adhesive film sample formed, which is convenient for directly evaluating the damp heat aging resistance of the adhesive film sample subsequently. The implementation details of the method for manufacturing the adhesive film sample in the embodiment of the present invention are specifically described below. The following content is only the implementation details provided for convenient understanding and is not necessary for implementing the solution.

[0025] As Figure 1 shown, in step 101, a photovoltaic cell is obtained. The photovoltaic cell is a bare chip cell.

[0026] Specifically, a bare chip cell, also known as a cell bare chip or a photovoltaic cell, refers to an unencapsulated and bare single photovoltaic cell. Generally, it is a thin-film cell that has completed processes such as diffusion junction formation, etching, and electrode preparation, with metal electrodes printed on its surface.

[0027] In step 102, the photovoltaic cell is encapsulated into a glue film. The glue film completely covers the front, back, and edges of the photovoltaic cell.

[0028] In step 103, an isolation layer is provided on the surface of the glue film. The isolation layer is used to isolate the glue film and the glass.

[0029] In step 104, the glass is adhesively attached to the surface of the isolation layer to obtain a structure to be laminated.

[0030] In some embodiments, providing the isolation layer on the surface of the glue film includes: providing a first sub-isolation layer on the outer surface of the glue film corresponding to the front of the photovoltaic cell; providing a second sub-isolation layer on the outer surface of the glue film corresponding to the back of the photovoltaic cell; the outer sides of the glue film corresponding to the front and back of the photovoltaic cell are both on the side away from the photovoltaic cell; adhesively attaching the glass to the surface of the isolation layer includes: providing the glass on the outer sides of the first sub-isolation layer and the second sub-isolation layer respectively; the outer sides of the first sub-isolation layer and the second sub-isolation layer are both on the side away from the photovoltaic cell.

[0031] Specifically, as Figure 2 and Figure 3As shown in the figure, the structure to be laminated includes a photovoltaic cell 1, a glue film 2, a first sub-isolation layer 3, a second sub-isolation layer 4, and glass 5. Among them, the glue film 2 completely covers the front, back, and edges of the photovoltaic cell 1. Further, when setting the isolation layer 3, the first sub-isolation layer 3 is set on the outer surface 201 of the glue film corresponding to the front surface 101 of the photovoltaic cell 1, that is, the first sub-isolation layer 3 is set in the direction facing the front surface of the photovoltaic cell 1; the second sub-isolation layer 4 is set on the outer surface 202 of the glue film corresponding to the back surface 102 of the photovoltaic cell 1, that is, the first sub-isolation layer 3 is set in the direction facing the back surface of the photovoltaic cell 1. During the lamination process of the structure to be laminated, the first sub-isolation layer 3 is bonded to the outer surface 201 of the glue film corresponding to the front surface 101 of the photovoltaic cell 1; the second sub-isolation layer 4 is bonded to the outer surface 202 of the glue film corresponding to the back surface 102 of the photovoltaic cell 1. Furthermore, the outer surface 301 of the first sub-isolation layer 3, that is, the side of the first sub-isolation layer 3 away from the photovoltaic cell 1; and the outer surface 402 of the second sub-isolation layer 4, that is, the side of the second sub-isolation layer 4 away from the photovoltaic cell 1, are respectively provided with glass 5. That is, in a complete structure to be laminated, from left to right are glass 5, the first sub-isolation layer 3, the glue film 2, the second sub-isolation layer 4, and glass 5; among them, the photovoltaic cell 1 is wrapped in the middle of the glue film 2.

[0032] After the lamination is completed, the first sub-isolation layer 3, the second sub-isolation layer 4, and the glass 5 are separated to obtain the glue film 2 wrapped with the photovoltaic cell 1, and a glue film sample for evaluating the moisture and heat aging resistance of the glue film is obtained.

[0033] In some embodiments, the material of the isolation layer is an organic substance. Through the isolation layer made of an organic substance in this application, the glue film and the glass can be effectively isolated, which is convenient for separating the glass and the isolation layer after lamination. Further, the material of the isolation layer is PET material, that is, polyethylene terephthalate. And, silicone oil is coated on both sides of the isolation layer to facilitate the separation of the glass and the isolation layer after lamination. By setting the isolation layer made of PET material and coating silicone oil on both sides of the isolation layer in this application, the isolation layer is not easily adhered to the glue film and the glass. It should be noted that those skilled in the art can change the material of the isolation layer according to actual production requirements. In addition, other isolation materials can also be added between the glass and the glue film, as long as it is ensured, this application does not make restrictions here.

[0034] In step 105, laminate the structure to be laminated.

[0035] In some embodiments, laminating the structure to be laminated includes: placing the structure to be laminated at a temperature of 85°C to 165°C and laminating it at a pressure of 0.1 MPa to 0.3 MPa for 3 min to 25 min. Further, as a preferred lamination condition, the structure to be laminated can be laminated at a temperature of 120°C and a pressure of 0.2 MPa for 15 min. It should be noted that those skilled in the art can change the temperature, pressure, and time parameters during the lamination process according to actual production requirements. Additionally, other lamination conditions can also be added or changed, and the present application does not limit this here.

[0036] In step 106, the isolation layer and the glass are removed to obtain the film sample.

[0037] In the embodiments of the present invention, since the film sample only includes the laminated bare-chip photovoltaic cell and the film, during the process of evaluating the damp heat aging resistance method of the film, the film sample is directly simulated under extreme conditions for the damp heat aging resistance evaluation, reducing the influence on the extension of the test time caused by the good waterproof performance of the glass during the test process. Thus, the damp heat aging resistance of the film can be directly evaluated, greatly shortening the time required for the damp heat aging resistance evaluation of the film; moreover, since the film and the glass are blocked by the isolation layer before lamination, during the lamination process of the structure to be laminated, the film will not adhere to the glass, enabling the glass and the film to be quickly separated to obtain the film sample and keeping the film sample formed, facilitating the subsequent direct damp heat aging resistance evaluation of the film sample.

[0038] In summary, specific embodiments of the present subject matter have been described. The step division of the above method is only for clear description, and during implementation, it can be combined into one step or some steps can be split into multiple steps. As long as the same logical relationship is included, it is within the protection scope of this patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs, but not changing the core design of its algorithm and process, are all within the protection scope of this patent.

[0039] In addition, the examples mentioned in the above embodiments can be freely combined, and any combination method can be understood as an embodiment. The "embodiment" or "example" that appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art can understand that the embodiments described herein can be combined with other embodiments.

[0040] Another embodiment of the present invention relates to a film sample, such as Figure 3As shown, it includes the film sample prepared by the above-mentioned method for manufacturing a film sample. The film sample includes: a laminated photovoltaic cell 1 and a film 2; wherein, the photovoltaic cell 1 is a bare chip cell; the film 2 completely covers the front, back, and edges of the photovoltaic cell 1.

[0041] Further, as Figure 2 shown, before obtaining the film sample, a structure to be laminated is first prepared. The structure to be laminated includes a photovoltaic cell 1, a film 2, a first sub-isolation layer 3, a second sub-isolation layer 4, and a glass 5; wherein, the film 2 completely covers the front, back, and edges of the photovoltaic cell 1. Further, when setting the isolation layer 3, the first sub-isolation layer 3 is set on the outer surface 201 of the film corresponding to the front surface 101 of the photovoltaic cell 1, that is, the first sub-isolation layer 3 is set in the direction facing the front surface of the photovoltaic cell 1; the second sub-isolation layer 4 is set on the outer surface 202 of the film corresponding to the back surface 102 of the photovoltaic cell 1, that is, the first sub-isolation layer 3 is set in the direction facing the back surface of the photovoltaic cell 1. During the lamination process of the structure to be laminated, the first sub-isolation layer 3 is attached to the outer surface 201 of the film corresponding to the front surface 101 of the photovoltaic cell 1; the second sub-isolation layer 4 is attached to the outer surface 202 of the film corresponding to the back surface 102 of the photovoltaic cell 1. Even further, the outer surface 301 of the first sub-isolation layer 3, that is, the side of the first sub-isolation layer 3 away from the photovoltaic cell 1; and the outer surface 402 of the second sub-isolation layer 4, that is, the side of the second sub-isolation layer 4 away from the photovoltaic cell 1, are respectively provided with a glass 5. That is, in a complete structure to be laminated, from left to right are glass 5, first sub-isolation layer 3, film 2, second sub-isolation layer 4, glass 5; wherein, the film 2 wraps the photovoltaic cell 1 in the middle.

[0042] After completing the lamination, the first sub-isolation layer 3, the second sub-isolation layer 4, and the glass 5 are separated to obtain the film 2 wrapping the photovoltaic cell 1, and a film sample for evaluating the damp heat aging resistance of the film is obtained, as Figure 4 shown.

[0043] In the embodiment of the present invention, since the film sample only includes the laminated bare chip photovoltaic cell and the film, during the process of the method for evaluating the damp heat aging resistance of the film, the extreme conditions are directly simulated to evaluate the damp heat aging resistance of the film sample, reducing the influence on the extension of the test time caused by the good waterproof performance of the glass during the test process, so that the damp heat aging resistance of the film can be directly evaluated, greatly shortening the time required for evaluating the damp heat aging resistance of the film; and, since the film and the glass are blocked by the isolation layer before lamination, during the lamination process of the structure to be laminated, the film will not adhere to the glass, and the glass and the film can be quickly separated to obtain the film sample, and the film sample can be kept formed, facilitating the subsequent direct evaluation of the damp heat aging resistance of the film sample.

[0044] It is not difficult to find that this embodiment is a film sample embodiment corresponding to the above method embodiment, and this embodiment can be implemented in cooperation with the above method embodiment. The relevant technical details mentioned in the above method embodiment are still valid in this embodiment. To avoid repetition, they will not be elaborated here. Correspondingly, the relevant technical details mentioned in this embodiment can also be applied to the above method embodiment.

[0045] An embodiment of the present invention also provides a method for evaluating the damp heat aging resistance of a film, including: obtaining a film sample; the film sample is prepared by the above-mentioned film sample manufacturing method; placing the film sample in water for cooking; during the cooking process, detecting the film sample at preset time intervals to obtain the damp heat characteristic data of the film sample. Since the film sample only includes the laminated bare chip photovoltaic cell and the film, during the process of evaluating the damp heat aging resistance of the film, the extreme conditions are directly simulated to evaluate the damp heat aging resistance of the film sample, reducing the influence on the extension of the test time caused by the good waterproof performance of the glass during the test, so that the damp heat aging resistance of the film can be directly evaluated, greatly shortening the time required for evaluating the damp heat aging resistance of the film; and, since the film and the glass are blocked by an isolation layer before lamination, during the lamination process of the structure to be laminated, the film will not adhere to the glass, and the glass and the film can be quickly separated to obtain the film sample, and the film sample can be kept formed, which is convenient for directly evaluating the damp heat aging resistance of the film sample subsequently. The implementation details of the film sample manufacturing method of the embodiment of the present invention will be specifically described below. The following content is only the implementation details provided for easy understanding and is not necessary for implementing the solution.

[0046] As Figure 5 shown, in step 501, a film sample is obtained. The film sample is prepared by the film sample manufacturing method embodiment described above, or the film sample in the above embodiment.

[0047] In step 502, the film sample is placed in water for cooking.

[0048] In some embodiments, the cooking environment of the film sample is deionized water at 45°C to 120°C. In this application, by directly cooking the film sample in deionized water, extreme damp heat aging conditions are provided for the film sample, and the film sample is directly in contact with the high-temperature and high-humidity conditions, which is beneficial to accelerating the aging of the film sample, so as to achieve rapid evaluation of damp heat aging resistance. Further, the cooking environment of the film sample is preferably deionized water at 85°C to 95°C. It should be noted that those skilled in the art can adjust the damp heat aging conditions of the film according to actual production requirements, and this application does not limit it here.

[0049] In step 503, during the steaming process, the adhesive film sample is detected at preset time intervals to obtain the data of the moisture and heat resistance characteristics of the adhesive film sample.

[0050] In some embodiments, the detecting the adhesive film sample at preset time intervals includes: detecting the color difference, appearance, and electrical properties of the adhesive film sample once every preset time interval, and recording the detection results until the adhesive film sample is damaged. In some embodiments, the preset time interval is determined according to the waterproof characteristic type of the adhesive film, and the waterproof characteristic type includes a high-strength type and a low-strength type; when the waterproof characteristic type of the adhesive film is the high-strength type, the preset time interval is 20 hours to 72 hours; when the waterproof characteristic type of the adhesive film is the low-strength type, the preset time interval is 3 hours to 15 hours. Since the adhesive film is directly placed under high-temperature and high-humidity conditions for steaming in this application, the aging speed of the adhesive film is accelerated, so the time interval for detection is shortened; moreover, by setting different preset time intervals for detection according to the waterproof characteristic types of different adhesive film samples in this application, it is beneficial to flexibly adjust the test duration according to the waterproof characteristic types of the adhesive film samples, and improve the adaptability of the moisture and heat aging evaluation method of the adhesive film to different waterproof characteristic types of the adhesive film. Specifically, for the high-strength adhesive film type, a preset time interval of 24 hours or 48 hours can be preferably used to detect the adhesive film sample regularly; for the low-strength adhesive film type, a preset time interval of 4 hours or 12 hours can be preferably used to detect the adhesive film sample regularly. It should be noted that those skilled in the art can flexibly adjust the preset time interval according to the actual performance and strength of the adhesive film, and this application does not limit it here.

[0051] Specifically, during the detection of the adhesive film sample, for the color difference detection of the adhesive film sample, the initial chromaticity value of the adhesive film sample can be recorded, and the chromaticity value of the adhesive film sample is recorded again after every preset time interval. The chromaticity value can be detected and identified by devices such as Konica, and this application will not elaborate here. For the appearance of the adhesive film sample, it can be detected by manual observation or visual inspection to check whether there are cracks, crazing, etc. on the surface of the adhesive film sample. In addition, for the electrical properties of the adhesive film sample, the adhesive film sample can be powered on, and electro-luminescence (EL) detection is performed on the adhesive film sample. The EL image of the adhesive film sample after aging treatment is compared with the initial EL image of the adhesive film sample to determine whether there is blackening or darkening, so as to further determine the corrosion condition of the adhesive film sample; or, by powering on the adhesive film sample, the power of the adhesive film sample is tested, and the power of the initial adhesive film sample is compared with the power of the adhesive film sample after aging treatment to determine whether there is a difference or attenuation, so as to determine the corrosion condition of the adhesive film sample. It should be noted that those skilled in the art can detect various properties and appearances of the adhesive film sample according to actual production requirements, and this application does not limit it here.

[0052] Specifically, the waterproof characteristic type of the adhesive film can be determined according to the water resistance of the adhesive film and the water vapor barrier property of the adhesive film. Among them, the water resistance of the adhesive film, that is, the ability of the adhesive film to resist water penetration and erosion, that is, in the case of long-term contact with water, the adhesive film maintains its stable performance and does not dissolve or degrade; the water vapor barrier property of the adhesive film, that is, the ability of the adhesive film to prevent water vapor from passing through. The high-strength adhesive film type is also an adhesive film with a relatively high waterproof strength, such as an ethylene-vinyl acetate copolymer (EVA) adhesive film or a polyvinylidene fluoride (PVDF) adhesive film; the low-strength adhesive film type is also an adhesive film with a relatively low waterproof strength, such as a thermoplastic polyurethane (TPU) adhesive film or a polyethylene (PE) adhesive film. It should be noted that the waterproof characteristic types of different adhesive films are different, and those skilled in the art can determine the specific preset duration according to the actual waterproof characteristics of the adhesive film, and this application does not limit it here.

[0053] In the embodiments of the present invention, since the adhesive film sample only includes the laminated bare chip photovoltaic cell and the adhesive film, during the process of the adhesive film damp heat aging evaluation method, the extreme conditions are directly simulated to evaluate the damp heat aging of the adhesive film sample, reducing the influence on the extension of the test time caused by the good waterproof performance of the glass during the test process, so that the damp heat aging of the adhesive film can be directly evaluated, greatly shortening the time required for the damp heat aging evaluation of the adhesive film; and, since the adhesive film and the glass are blocked by the isolation layer before lamination, during the lamination process of the structure to be laminated, the adhesive film will not adhere to the glass, and the glass and the adhesive film can be quickly separated to obtain the adhesive film sample and keep the adhesive film sample formed, which is convenient for directly evaluating the damp heat aging of the adhesive film sample subsequently.

[0054] In summary, specific embodiments of the present subject matter have been described. The step division of the above method is only for clear description, and when implemented, it can be combined into one step or some steps can be split into multiple steps. As long as the same logical relationship is included, it is within the protection scope of this patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs, but not changing the core design of its algorithm and process are within the protection scope of this patent.

[0055] In addition, the examples mentioned in the above embodiments can be freely combined, and any combination method can be understood as an embodiment. The "embodiment" or "example" mentioned at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art can understand that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0057] In the description of the embodiments of the present application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may mean: A exists, both A and B exist, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] In the description of the embodiments of the present application, as used herein, spatial relative terms such as "below", "beneath", "lower", "bottom", "above", "upper", "top", "front", "back", "left", "right", "front side", "back side" etc. may be used for ease of description to describe the relationship of one element or feature to another element or feature as illustrated in the figures. Unless otherwise specified, spatial relative terms are intended to cover different orientations of the material in addition to the orientation depicted in the figures. For example, if the material in the figures is inverted, the element described as "below" or "beneath" or "under" or "bottom" of other elements or features will be oriented "above" or "on top" of those other elements or features. Thus, the term "below" may cover both upward and downward orientations depending on the context in which the term is used, which will be apparent to those of ordinary skill in the art. The material may be oriented in other ways (e.g., rotated 90 degrees, inverted, flipped), and the spatial relative descriptors used herein may be interpreted accordingly.

[0059] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present invention, and in practical applications, various changes can be made to them in form and details without departing from the spirit and scope of the present invention.

Claims

1. A method for preparing a film sample, characterized in that: include: Obtaining a photovoltaic cell, wherein the photovoltaic cell is a bare cell; Encapsulating the photovoltaic cell sheet in an adhesive film, wherein the adhesive film completely covers the front side, the back side and the edge of the photovoltaic cell sheet; An isolation layer is arranged on the surface of the adhesive film, wherein the isolation layer is used to isolate the adhesive film from the glass; Laying the glass on the surface of the isolation layer to obtain a structure to be laminated; laminating the structure to be laminated; The isolation layer and the glass are removed to obtain the adhesive film sample.

2. The method for preparing a film sample according to claim 1, characterized in that: The step of providing an isolation layer on the surface of the adhesive film comprises: A first sub-isolating layer is arranged on the surface of the outer side of the adhesive film corresponding to the front side of the photovoltaic cell; a second sub-isolating layer is arranged on the surface of the outer side of the adhesive film corresponding to the back side of the photovoltaic cell; the outer side of the adhesive film corresponding to the front side of the photovoltaic cell and the outer side of the adhesive film corresponding to the front side of the photovoltaic cell are both on the side away from the photovoltaic cell; The step of laminating the glass on the surface of the isolation layer comprises: The glass is disposed on the outer sides of the first sub-isolating layer and the second sub-isolating layer respectively; the outer side of the first sub-isolating layer and the outer side of the second sub-isolating layer are both on the side away from the photovoltaic cell sheet.

3. The method for preparing a film sample according to claim 1, characterized in that: The material of the isolation layer is organic matter.

4. The method for preparing a film sample according to claim 3, characterized in that: The isolation layer is made of PET material, and both sides of the isolation layer are coated with silicone oil.

5. The method for preparing a film sample according to claim 1, characterized in that: The laminating the structure to be laminated comprises: placing the structure to be laminated at a temperature of 85° C. to 165° C. and laminating at a pressure of 0.1 MPa to 0.3 MPa for 3 minutes to 25 minutes.

6. A film sample, characterized in that: include: Photovoltaic cells and films after lamination; Wherein, the photovoltaic cell is a bare cell; The adhesive film completely covers the front side, the back side and the edge of the photovoltaic cell.

7. A method for evaluating the resistance of adhesive film to moisture and heat aging, characterized in that: include: Obtain film samples; The film sample is prepared by the film sample preparation method according to any one of claims 1 to 5; The film sample is placed in water and boiled; During the cooking process, the film samples are tested at preset time intervals to obtain moisture and heat resistance characteristic data of the film samples.

8. The method for evaluating the film's resistance to moisture and heat aging according to claim 7, characterized in that: The cooking environment of the film sample is deionized water at 45° C. to 120° C.

9. The method for evaluating the film's resistance to moisture and heat aging according to claim 7, characterized in that: The film sample is tested at a preset interval, including: The color difference, appearance and electrical properties of the film sample are tested once at each preset time interval, and the test results are recorded until the film sample is damaged.

10. The method for evaluating the film's resistance to moisture and heat aging according to claim 8, characterized in that: The preset duration is determined according to the waterproof characteristic type of the adhesive film, and the waterproof characteristic type includes a high-intensity type and a low-intensity type; When the waterproof property type of the adhesive film is a high-strength type, the preset time is 20 hours to 72 hours; When the waterproof property type of the adhesive film is a low-intensity type, the preset time length is 3 hours to 15 hours.

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