Adhesive film water permeability testing assembly

Abstract

The utility model discloses an adhesive film water permeability testing assembly, and relates to the technical field of photovoltaics. The adhesive film water permeability testing assembly comprises a first pressing plate, an adhesive film and a second pressing plate which are sequentially stacked, the first pressing plate is of a transparent structure, humidity detection test paper is arranged between the first pressing plate and the second pressing plate and completely covered with the adhesive film, and the edge of the adhesive film comprises a sealing edge and a testing edge. The sealing edge is provided with a sealing part to prevent the adhesive film from permeating from the sealing edge. According to the adhesive film water permeability testing assembly provided by the embodiment of the invention, the use state of the adhesive film in the photovoltaic module can be simulated, and a tester can intuitively observe where water vapor invades, so that the water permeability of the adhesive film when the adhesive film is applied to the photovoltaic module can be accurately judged through the adhesive film water permeability testing assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic, in particular to a kind of film water permeability test components. BACKGROUND

[0002] Encapsulation film as the core material of photovoltaic module, it protects fragile solar cell, and makes sunlight maximumly penetrate film to reach cell.The film can reduce the influence of external force environment on cell during operation, prolong the service life of photovoltaic module.The water permeability of film is an important indicator to evaluate the reliability of film.The conventional test is to detect film alone or test its material, although this test has certain reference significance, but it cannot accurately represent the performance of film in photovoltaic module.For example, when film is applied to photovoltaic module, it is difficult to draw a conclusion by existing test method that water vapor can penetrate to which position. UTILITY MODEL CONTENT

[0003] The purpose of the present application is to provide a kind of film water permeability test components, it can accurately test the water permeability performance of film in module end.

[0004] The embodiment of the present application is realized as follows:

[0005] In a first aspect, the present application provides a kind of film water permeability test components, including first pressing plate, film and second pressing plate which are sequentially stacked, first pressing plate is transparent structure, humidity detection test paper is arranged between first pressing plate and second pressing plate, humidity detection test paper is completely covered by film, the edge of film includes sealing edge and test edge, sealing edge is provided with sealing part to block water vapor from sealing edge into film.

[0006] In an optional implementation, the film has two opposite sealing edges in the first direction, and the film has two opposite test edges in the second direction, wherein the first direction is perpendicular to the second direction.

[0007] In an optional implementation, the humidity detection test paper is strip-shaped and extends along the second direction.

[0008] In an optional implementation, the film water permeability test component includes a plurality of humidity detection test papers, and the plurality of humidity detection test papers are arranged at intervals in the first direction.

[0009] In an optional implementation, the film water permeability test component includes a plurality of humidity detection test papers, and the plurality of humidity detection test papers are arranged between the first pressing plate and the second pressing plate.

[0010] In an optional embodiment, the plurality of humidity detection test papers are arranged in an N-row-by-M-column array, the humidity detection test papers in the same column are arranged at intervals in the first direction, and the humidity detection test papers in the same row are arranged at intervals in the second direction, wherein M and N are integers greater than 1.

[0011] In an optional embodiment, the adhesive film comprises a first film layer and a second film layer arranged in a stack, and the humidity detection test paper is arranged between the first film layer and the second film layer.

[0012] In an optional embodiment, the first pressing plate and / or the second pressing plate is provided with a fitting groove, and the humidity detection test paper is embedded in the fitting groove.

[0013] In an optional embodiment, the material of the sealing portion is butyl rubber.

[0014] In an optional embodiment, the first pressing plate and the second pressing plate are made of glass.

[0015] The beneficial effects of the embodiments of the present application are as follows.

[0016] The present application provides an adhesive film water permeability test assembly, comprising a first pressing plate, an adhesive film and a second pressing plate arranged in a stack, the first pressing plate is a transparent structure, a humidity detection test paper is arranged between the first pressing plate and the second pressing plate, the humidity detection test paper is completely covered by the adhesive film, the edge of the adhesive film comprises a sealing edge and a test edge, and the sealing edge is provided with a sealing portion to block the water vapor from the sealing edge into the adhesive film. In the present embodiment, the adhesive film is clamped by the first pressing plate and the second pressing plate, which can simulate the state that the adhesive film is clamped by the front panel and the back panel in the photovoltaic assembly. The humidity detection test paper will change color when absorbing water vapor, and the first pressing plate is a transparent structure, so the humidity detection test paper can be observed by the tester when it changes color, and the tester can directly judge where the water vapor penetrates according to the color change of the humidity detection test paper. By providing the sealing portion, the water vapor can only penetrate into the adhesive film from the test edge, which is conducive to testing the water permeability of the adhesive film in a specific direction, and avoids the water vapor entering from the sealing edge, which affects the humidity detection test paper and has an adverse effect on observation. It can be seen that the adhesive film water permeability test assembly provided by the embodiments of the present application can simulate the use state of the adhesive film in the photovoltaic assembly, and the tester can directly observe where the water vapor invades, so the water permeability of the adhesive film when applied to the photovoltaic assembly can be accurately judged by the adhesive film water permeability test assembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. Other related drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 A schematic view of a film water permeability test assembly according to an embodiment of the present application;

[0019] Figure 2 A sectional view of a film water permeability test assembly according to an embodiment of the present application;

[0020] Figure 3 A schematic view of a film water permeability test assembly according to another embodiment of the present application;

[0021] Figure 4 A sectional view of a film water permeability test assembly according to another embodiment of the present application.

[0022] Figure: 100 - film water permeability test assembly; 110 - first pressing plate; 111 - assembly groove; 120 - second pressing plate; 130 - film; 130a - sealing edge; 130b - test edge; 131 - first film layer; 132 - second film layer; 140 - humidity detection test paper; 150 - sealing part. DETAILED DESCRIPTION

[0023] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0025] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0028] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The conventional test of water vapor transmission rate is to take the adhesive film or its material alone for testing, which has certain guiding significance, but the performance of the adhesive film in the photovoltaic module is difficult to predict. For example, the EVA adhesive film with a water vapor transmission rate of 14.2 g / (m 3 ·day) is easily compared with the thermoplastic polyolefin elastomer adhesive film (POE) with a water vapor transmission rate of 0.7 g / (m 3 ·day) in terms of material, and the advantages and disadvantages of the two can be easily seen. However, at the module end, it is difficult to directly determine whether the water vapor transmission rate value of 14.2 g / (m 3 ·day) can allow water vapor to penetrate to which position, whether it can completely cross the creepage distance (usually 10-13 mm) of the photovoltaic module and directly act on the cell, through the existing test method.

[0030] Therefore, the present application provides an adhesive film water permeability test module, which simulates the state of the adhesive film in the photovoltaic module, and displays the position of water vapor penetration through the color change of the humidity detection test paper, so as to accurately test the water permeability of the adhesive film when applied to the photovoltaic module.

[0031] Figure 1This is a schematic diagram of the film permeability testing component 100 in one embodiment of this application; Figure 2 This is a cross-sectional view of a membrane permeability testing assembly 100 in one embodiment of this application. Figure 1 and Figure 2 As shown, the membrane permeability testing assembly 100 provided in this application embodiment includes a first pressure plate 110, a membrane 130 and a second pressure plate 120 stacked sequentially. The first pressure plate 110 is a transparent structure. A humidity test paper 140 is disposed between the first pressure plate 110 and the second pressure plate 120. The humidity test paper 140 is completely covered by the membrane 130. The edge of the membrane 130 includes a sealing edge 130a and a test edge 130b. The sealing edge 130a is provided with a sealing part 150 to prevent water vapor from seeping into the membrane 130 from the sealing edge 130a.

[0032] In this embodiment, the first pressure plate 110 is transparent, allowing the tester to easily observe the color change of the humidity test paper 140 from one side of the first pressure plate 110. In this embodiment, both the first pressure plate 110 and the second pressure plate 120 are made of glass, allowing the tester to observe the color change of the humidity test paper 140 from both sides. In other optional embodiments, the first pressure plate 110 and the second pressure plate 120 can also be made of other transparent materials, such as acrylic; in other embodiments, the second pressure plate 120 can also be made of an opaque material, such as opaque plastic or a metal plate.

[0033] In this embodiment, the first pressure plate 110 and the second pressure plate 120 are two rectangular plates of the same size, used to simulate the front and back panels of the laminates in a photovoltaic module. In other optional embodiments, the shapes of the first pressure plate 110 and the second pressure plate 120 can also be other shapes, such as circles, ellipses, or other polygons. In other embodiments, the dimensions of the first pressure plate 110 and the second pressure plate 120 can also be different; for example, the size of the second pressure plate 120 is larger than the first size. However, it should be noted that the adhesive film 130 should be located within the overlapping area of ​​the first pressure plate 110 and the second pressure plate 120.

[0034] In the embodiment, the opposite two sides of the adhesive film 130 in the first direction (arrow ab direction in the figure) are sealing edges 130a, and the opposite two sides of the adhesive film 130 in the second direction (arrow cd direction in the figure) are test edges 130b, wherein the first direction is perpendicular to the second direction. In this way, water vapor can only penetrate into the middle of the adhesive film 130 from the test edges 130b of the adhesive film 130 in the second direction, so that the water vapor penetration of the adhesive film 130 in the second direction can be conveniently investigated. The sealing part 150 provided on the sealing edge 130a can block water vapor, so as to avoid the water vapor from the sealing edge 130a of the adhesive film 130 entering and invading into the humidity detection test paper 140 in the first direction, thereby affecting the judgment. It can be understood that if the sealing part 150 is not provided on the sealing edge 130a, when the humidity detection test paper 140 changes color, it cannot be judged which direction the water vapor invading affects the color change, so it is difficult to quantitatively judge the invasion distance of the water vapor in a certain direction (only the water vapor invasion distance greater than the shortest distance from the humidity detection test paper 140 to the edge of the adhesive film 130 can be judged).

[0035] In the embodiment, the sealing part 150 can be made of a material with good water blocking performance, such as butyl rubber. Butyl rubber has almost zero water permeability, which can effectively prevent water vapor from entering the adhesive film 130 from the sealing edge 130a of the adhesive film 130.

[0036] The adhesive film 130 can be rectangular and have a size comparable to the first pressing plate 110 and the second pressing plate 120. In the embodiment, the opposite two sides of the adhesive film 130 in the second direction are flush with the sides of the first pressing plate 110 and the second pressing plate 120; the size of the adhesive film 130 in the first direction is slightly smaller than the size of the first pressing plate 110 and the second pressing plate 120 in the first direction, and the sealing part 150 is arranged between the first pressing plate 110 and the second pressing plate 120 and is in contact with the edge of the adhesive film 130 in the first direction. It can be understood that in other embodiments, the opposite two sides of the adhesive film 130 in the first direction can also be flush with the sides of the first pressing plate 110 and the second pressing plate 120, and the sealing part 150 can be wrapped around the edges of the first pressing plate 110, the second pressing plate 120 and the adhesive film 130.

[0037] In other optional embodiments, the adhesive film 130 can be smaller than the first pressing plate 110 and the second pressing plate 120, for example, the size of the adhesive film 130 in the first direction and the second direction is smaller than the first pressing plate 110 and the second pressing plate 120.

[0038] In the embodiment, the humidity detection test paper 140 is in a strip shape and extends along the second direction. In this way, the tester can determine the penetration of the water vapor along the second direction according to the color change of the humidity detection test paper 140 in the length direction. For example, when the water vapor just invades the end of the humidity detection test paper 140, only the end of the humidity detection test paper 140 changes color; but when the water vapor further invades, the distance of the color change of the humidity detection test paper 140 in the length direction increases. Therefore, the above arrangement allows the tester to determine the specific invasion position of the water vapor according to the color change of the humidity detection test paper 140.

[0039] In Figure 1 the embodiment, the adhesive film water permeability test assembly 100 includes a plurality of humidity detection test papers 140, and the plurality of humidity detection test papers 140 are arranged at intervals in the first direction. By arranging a plurality of humidity detection test papers 140, the tester can determine the invasion of the water vapor in the second direction according to the plurality of different humidity detection test papers 140, thereby reducing the judgment error and improving the judgment accuracy.

[0040] Optionally, the distance W between the end of the humidity detection test paper 140 and the test edge 130b of the corresponding adhesive film 130 is 10-13 mm, which is close to the creepage distance of the laminated part of a conventional photovoltaic assembly, and can effectively detect whether the penetration distance of the water vapor in the adhesive film 130 can exceed the creepage distance and affect the cell sheet.

[0041] Figure 3 Fig. 2 is a schematic view of the adhesive film water permeability test assembly 100 according to another embodiment of the present application. As shown in Figure 3 Fig. 2, in the optional embodiment, the adhesive film water permeability test assembly 100 includes a plurality of humidity detection test papers 140, and the plurality of humidity detection test papers 140 are arranged at intervals in the first direction. Unlike the Figure 1 embodiment, the plurality of humidity detection test papers 140 are arranged in an N-row and M-column array, and the humidity detection test papers 140 in the same column are arranged at intervals in the first direction, and the humidity detection test papers 140 in the same row are arranged at intervals in the second direction, wherein M and N are integers greater than 1. Figure 3 In the embodiment, the plurality of humidity detection test papers 140 are not in a strip shape, but are arranged in an N-row and M-column array, and the humidity detection test papers 140 in the same column are arranged at intervals in the first direction, and the humidity detection test papers 140 in the same row are arranged at intervals in the second direction, wherein M and N are integers greater than 1. As shown in Figure 3 Fig. 2, in the embodiment, the humidity detection test papers 140 are arranged in three rows and three columns.

[0042] The humidity detection test papers 140 in the same row can play a similar role to the strip-shaped humidity detection test paper 140 in the Figure 1 embodiment. When the water vapor invades from the test edge 130b of the adhesive film 130, the farther the invasion distance, the more the humidity detection test papers 140 in a row change color. For example Figure 3In the embodiment, if the left humidity detection test paper 140 changes color and the middle humidity detection test paper 140 does not change color, it can be considered that the water vapor has reached the position of the left humidity detection test paper 140 but has not reached the position of the middle humidity detection test paper 140. As can be seen, by reducing the size of each humidity detection test paper 140 and increasing the number of humidity detection test papers 140 arranged in the same row, the detection accuracy can be improved. Figure 3 The scheme of arranging a plurality of humidity detection test papers 140 discretely in the second direction in the embodiment can avoid the detection error (easily overestimating the water permeability of the adhesive film 130) caused by the too strong water permeability of the strip-shaped humidity detection test paper 140 (such as the humidity detection test paper 140 shown in FIG. 1). Figure 1 The scheme of arranging a plurality of humidity detection test papers 140 discretely in the second direction in the embodiment can avoid the detection error (easily overestimating the water permeability of the adhesive film 130) caused by the too strong water permeability of the strip-shaped humidity detection test paper 140 (such as the humidity detection test paper 140 shown in FIG. 1).

[0043] In addition, in some embodiments, the second pressing plate 120 can simulate a back plate having a certain water permeability in the laminated component in terms of material selection, and then the plurality of humidity detection test papers 140 discretely distributed can effectively detect the water vapor permeation at different positions of the adhesive film 130.

[0044] As shown in FIG. 1, the adhesive film 130 can be transparent or translucent, and the color change of the humidity detection test paper 140 in the adhesive film 130 can be observed by the tester. Figure 2 As shown in FIG. 1, the adhesive film 130 can be transparent or translucent, and the color change of the humidity detection test paper 140 in the adhesive film 130 can be observed by the tester.

[0045] Figure 4 FIG. 2 is a sectional view of the adhesive film water permeability test assembly 100 according to another embodiment of the present application. As shown in FIG. 2, in this embodiment, the humidity detection test paper 140 is arranged between the adhesive film 130 and the first pressing plate 110. Figure 4

[0046] In order to reduce the influence of the humidity detection test paper 140 itself on the shape of the adhesive film 130 and improve the accuracy of the test, in the embodiment of the present application, the first pressing plate 110 is provided with an assembly groove 111, and the humidity detection test paper 140 is embedded in the assembly groove 111. By arranging the humidity detection test paper 140 in the assembly groove 111, the humidity detection test paper 140 is flush with the inner surface of the first pressing plate 110, so that the humidity detection test paper 140 does not affect the flatness of the adhesive film 130. In other embodiments, the second pressing plate 120 can also be provided with an assembly groove 111, and at least part of the humidity detection test paper 140 can also be embedded in the assembly groove 111 of the second pressing plate 120.

[0047] ​For the convenience of testing, the size of the film water permeability test assembly 100 in the embodiments of the present application can be smaller than the size of the laminated piece in the actual product, for example, the first pressing plate 110 and the second pressing plate 120 are selected as a plate body with a size of 300 mm x 300 mm.

[0048] In the case where the shortest distance between the humidity detection test paper 140 and the test edge 130b of the film 130 is set as the creepage distance of the laminated piece, the water permeability test result of the film 130 can be divided into three categories: 1) the color change interval of the humidity detection test paper 140 extends for a long distance (for the Figure 1 embodiment), or a large number of humidity detection test papers 140 change color (for the Figure 3 embodiment), which means that the water vapor penetration distance significantly exceeds the creepage distance; 2) the edge of the humidity detection test paper 140 slightly changes color (for the Figure 1 embodiment), or the first humidity detection test paper 140 close to the test edge 130b slightly changes color (for the Figure 3 embodiment), which means that the water vapor penetration distance is approximately equal to the creepage distance, and can just reach the edge of the battery piece; 3) if the color of the humidity detection test paper 140 does not change significantly, it means that the water vapor penetration distance is less than the creepage distance, and the water vapor will not act on the battery piece. In addition, in the case of a single-glass photovoltaic module, attention should also be paid to the back water permeability.

[0049] The film water permeability test assembly 100 provided by the embodiments of the present application can verify the specific performance of different films 130 and different back plates (corresponding to the second pressing plate 120).

[0050] In summary, the application provides a kind of film water permeability test assembly 100, including first pressing plate 110, film 130 and second pressing plate 120 arranged in sequence, first pressing plate 110 is transparent structure, humidity detection test paper 140 is arranged between first pressing plate 110 and second pressing plate 120, humidity detection test paper 140 is completely covered by film 130, the edge of film 130 includes sealing edge 130a and test edge 130b, sealing edge 130a is provided with sealing part 150 to block the water vapor from sealing edge 130a into film 130.In the embodiment, film 130 is clamped by first pressing plate 110 and second pressing plate 120, the state that film 130 is clamped by panel and backboard in photovoltaic module can be simulated.Humidity detection test paper 140 will change color when absorbing water vapor, first pressing plate 110 is transparent structure, therefore, humidity detection test paper 140 can be observed by tester when absorbing water vapor, tester can directly judge where water vapor penetrates according to the color change of humidity detection test paper 140.By setting sealing part 150, water vapor can only penetrate into film 130 from test edge 130b, which is conducive to testing the water permeability of film 130 in a specific direction, avoiding the influence of water vapor entering from sealing edge 130a on humidity detection test paper 140, which has adverse effect on observation.It can be seen that the film water permeability test assembly provided by the embodiment of the application can simulate the use state of film 130 in photovoltaic module, and the tester can directly observe where water vapor invades, so the film water permeability test assembly can accurately judge the water permeability of film 130 when applied to photovoltaic module.

[0051] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A film water permeability test assembly, comprising: The humidity detection test assembly comprises a first pressing plate, a film and a second pressing plate which are sequentially stacked, the first pressing plate is a transparent structure, a humidity detection test paper is arranged between the first pressing plate and the second pressing plate, the humidity detection test paper is completely covered by the film, edges of the film comprise sealing edges and test edges, the sealing edges are provided with sealing portions to prevent water vapor from penetrating into the film from the sealing edges.

2. The film water permeability test assembly of claim 1, wherein, The film has two opposite sealing edges in a first direction, and has two opposite test edges in a second direction, wherein the first direction is perpendicular to the second direction.

3. The film water permeability test assembly of claim 2, wherein, The humidity detection test paper is in a strip shape and extends along the second direction.

4. The film water permeability test assembly of claim 3, wherein, The film water permeability test assembly comprises a plurality of humidity detection test papers which are arranged at intervals in the first direction.

5. The membrane water permeability test assembly of claim 2, wherein, The film water permeability test assembly comprises a plurality of humidity detection test papers which are arranged at intervals in the first direction.

6. The membrane water permeability test assembly of claim 5, wherein, The humidity detection test papers are arranged in an N-row and M-column array, the humidity detection test papers in the same column are arranged at intervals in the first direction, and the humidity detection test papers in the same row are arranged at intervals in the second direction, wherein M and N are integers greater than 1.

7. The membrane water permeability test assembly of any one of claims 1 to 6, wherein, The film comprises a first film layer and a second film layer which are stacked, and the humidity detection test paper is arranged between the first film layer and the second film layer.

8. The membrane water permeability test assembly of any one of claims 1 to 6, wherein, The first pressing plate and / or the second pressing plate is provided with a fitting groove, and the humidity detection test paper is embedded in the fitting groove.

9. The membrane water permeability test assembly of any one of claims 1 to 6, wherein, The sealing portion is made of butyl rubber.

10. The membrane water permeability test assembly of any one of claims 1 to 6, wherein, The first pressing plate and the second pressing plate are made of glass.

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