Sample piece for testing peel strength of photovoltaic module

Abstract

The utility model relates to a photovoltaic module peel strength test sample piece, which comprises photovoltaic glass, and the photovoltaic glass comprises a first area. A first adhesive film, a battery piece, first isolation paper, a second adhesive film and a first photovoltaic back plate are sequentially arranged in the first area in a stacked mode. Wherein the first isolation paper is provided with a first hollow area extending in the first direction, the second adhesive film covers the first hollow area, and part of the second adhesive film is connected with the battery piece through the first hollow area. According to the test sample piece for the peel strength of the photovoltaic module, the adhesive film and the back plate do not need to be cut according to the standard size, the sample preparation operation difficulty is small, and the peel strength of the photovoltaic module can be conveniently tested.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic module peel strength test sample. Background Art

[0002] In photovoltaic modules, adhesive films are typically used to bond and secure the cells to the backsheet, as well as the cells to the glass. When testing the peel strength of photovoltaic modules, it may be necessary to test the peel strength between the cell and the adhesive film, the peel strength between the backsheet and the adhesive film, or the peel strength between the adhesive film and the glass. Traditional testing methods require cutting the test sample with the adhesive film and backsheet to a standard size in strict accordance with test requirements. This results in a standard-sized test sample, which is then used for peel testing. This sample preparation is quite difficult. Utility Model Content

[0003] Based on this, it is necessary to provide a photovoltaic module peel strength test sample that does not require cutting the film and backsheet into standard sizes, has low sample preparation difficulty, and is convenient for testing the peel strength of photovoltaic modules.

[0004] The present application provides a photovoltaic module peel strength test sample, comprising photovoltaic glass, wherein the photovoltaic glass comprises a first region;

[0005] and a first adhesive film, a solar cell, a first release paper, a second adhesive film and a first photovoltaic backsheet stacked in sequence in the first region;

[0006] The first release paper has a first hollow area extending along a first direction, the second adhesive film covers the first hollow area, and a portion of the second adhesive film is connected to the battery cell through the first hollow area.

[0007] In some embodiments, the length of the second adhesive film in the first direction is greater than the length of the first hollow area.

[0008] In some embodiments, at least one end of the first release paper in the first direction protrudes from an edge of the first photovoltaic backsheet.

[0009] In some embodiments, at least one end of the second adhesive film in the first direction protrudes from an edge of the first release paper, and one end of the second adhesive film protruding from the edge of the first release paper is connected to the battery cell.

[0010] In some embodiments, the first release paper has a plurality of first hollow areas arranged at intervals, each of the first hollow areas is covered by a second adhesive film, and the second adhesive films are arranged at intervals.

[0011] In some embodiments, the first hollow areas are identical in shape and size.

[0012] In some embodiments, the projection of the first hollow area on the surface of the photovoltaic glass is a rectangle.

[0013] In some embodiments, the photovoltaic glass further includes a second region spaced apart from the first region; the photovoltaic module peel strength test specimen further includes a third adhesive film, a second release paper, and a second photovoltaic backsheet sequentially stacked in the second region;

[0014] The second isolation paper has a second hollow area, the second photovoltaic backsheet covers the second hollow area, and a portion of the second photovoltaic backsheet is connected to the third adhesive film through the second hollow area.

[0015] In some embodiments, the second hollow region extends along the first direction, and a length of the second photovoltaic backsheet in the first direction is greater than a length of the second hollow region.

[0016] In some embodiments, the photovoltaic glass further includes a third region spaced apart from the first region; the photovoltaic module peel strength test specimen further includes a third release paper, a fourth adhesive film, and a third photovoltaic backsheet sequentially stacked in the third region;

[0017] The third release paper has a third hollow area, the fourth adhesive film covers the third hollow area, and a portion of the fourth adhesive film is connected to the photovoltaic glass through the third hollow area.

[0018] In some embodiments, the third hollow area extends along the first direction, and the length of the fourth adhesive film in the first direction is greater than the length of the third hollow area.

[0019] In the above-mentioned photovoltaic module peel strength test specimen, the solar cell and the second adhesive film are separated by a first release paper. Furthermore, the first release paper has a first hollowed-out area, which is covered by a second adhesive film. The second adhesive film and the first release paper are not adhered to each other, but adhere to the solar cell through the first hollowed-out area. In other words, the shape and area of ​​the first hollowed-out area correspond to the shape and area of ​​adhesion between the second adhesive film and the solar cell. During the peel strength test, a tensile force can be applied to the first photovoltaic backsheet and the second adhesive film to separate the second adhesive film and the solar cell within the first hollowed-out area, thereby testing the peel strength between the adhesive film and the solar cell within a specific area. When preparing the above-mentioned photovoltaic module peel strength test specimen, it is only necessary to form a standard-sized first hollowed-out area on the first release paper, thus forming a standard-sized adhesion sample. Release paper is easy to cut, making it convenient to form a standard-sized hollowed-out area. At the same time, before lamination, it is only necessary to form a second adhesive film and a first photovoltaic backboard that can cover the first hollow area. There is no need to cut the second adhesive film and the first photovoltaic backboard into standard sizes, which reduces the difficulty of sample preparation and facilitates the testing of the peeling strength of photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a photovoltaic module peel strength test sample provided in one embodiment of the present application;

[0021] Figure 2 A schematic top view of the structure of a photovoltaic module peel strength test sample provided in one embodiment of the present application.

[0022] Description of Reference Numerals

[0023] 1. Photovoltaic glass; 21. First adhesive film; 22. Third adhesive film; 3. Solar cell; 41. First release paper; 42. Second release paper; 43. Third release paper; 51. First hollow area; 52. Second hollow area; 53. Third hollow area; 61. Second adhesive film; 62. Fourth adhesive film; 71. First photovoltaic backsheet; 72. Second photovoltaic backsheet; 73. Third photovoltaic backsheet. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0028] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0029] Reference Figure 1~Figure 2 As shown, the present application provides a photovoltaic module peel strength test specimen, comprising: photovoltaic glass 1, photovoltaic glass 1 including a first region. A first adhesive film 21, a cell 3, a first release paper 41, a second adhesive film 61, and a first photovoltaic backsheet 71 are sequentially stacked within the first region. The first release paper 41 has a first hollow region 51 extending along a first direction. The second adhesive film 61 covers the first hollow region 51, and a portion of the second adhesive film 61 is connected to the cell 3 through the first hollow region 51.

[0030] In the above-mentioned photovoltaic module peel strength test specimen, the cell 3 and the second adhesive film 61 are separated by a first release paper 41. Furthermore, the first release paper 41 has a first hollowed-out area 51, which is covered by the second adhesive film 61. The second adhesive film 61 and the first release paper 41 are not adhered to each other, but adhered to the cell 3 through the first hollowed-out area 51. In other words, the shape and area of ​​the first hollowed-out area 51 correspond to the shape and area of ​​adhesion between the second adhesive film 61 and the cell 3. During the peel strength test, a tensile force can be applied to the first photovoltaic backsheet 71 and the second adhesive film 61 to separate the second adhesive film 61 and the cell 3 within the first hollowed-out area 51, thereby testing the peel strength between the adhesive film and the cell within a specific area. When preparing the above-mentioned photovoltaic module peel strength test specimen, only a standard-sized first hollowed-out area 51 needs to be formed on the first release paper 41, thus forming a standard-sized adhesion sample. Release paper is easy to cut, making it convenient to create a standard-sized hollowed-out area. At the same time, before lamination, it is only necessary to form the second adhesive film 61 and the first photovoltaic backsheet 71 that can cover the first hollow area 51. There is no need to cut the second adhesive film 61 and the first photovoltaic backsheet 71 into standard sizes, which reduces the difficulty of sample preparation and facilitates the peel strength test of the photovoltaic module. Figure 2 As shown, illustratively, Figure 2 The X direction is the first direction.

[0031] In some embodiments, the length of the second adhesive film 61 in the first direction is greater than the length of the first hollow area 51 .

[0032] In the first direction, the length of the second adhesive film 61 is greater than the length of the first hollow area 51. On the premise that the second adhesive film 61 covers the first hollow area 51, the second adhesive film 61 is at least partially arranged on the surface of the first isolation paper 41, which is convenient for clamping the second adhesive film 61 and the first photovoltaic backboard 71 and applying tension during testing, thereby facilitating testing.

[0033] In some embodiments, at least one end of the first release paper 41 in the first direction protrudes from an edge of the first photovoltaic backsheet 71 .

[0034] Since the photovoltaic backsheet is usually opaque, after the photovoltaic backsheet is affixed to the film, the structure of the underlying layer will be blocked. In the first direction, at least one end of the first isolation paper 41 protrudes from the edge of the first photovoltaic backsheet 71. A mark can be formed on the first isolation paper 41 exposed at the edge of the first photovoltaic backsheet 71 to mark between which two layers the first isolation paper 41 is set, thereby marking the test object of the peel strength test to facilitate the test.

[0035] In some embodiments, one end of the first release paper 41 in the first direction protrudes from the edge of the first photovoltaic backsheet 71 .

[0036] In some embodiments, at least one end of the second adhesive film 61 in the first direction protrudes from the edge of the first release paper 41 , and the end of the second adhesive film 61 protruding from the edge of the first release paper 41 is connected to the battery cell 3 .

[0037] One end of the second adhesive film 61 protruding from the edge of the first release paper 41 is connected to the battery cell 3. When performing a peel strength test, when the second adhesive film 61 and the battery cell 3 in the first hollow area 51 are separated along the first direction, a portion of the second adhesive film 61 can still remain adhered to the battery cell 3, which can improve the accuracy of the test.

[0038] In some embodiments, one end of the second adhesive film 61 in the first direction protrudes from the edge of the first release paper 41 .

[0039] In some embodiments, the first release paper 41 has a plurality of first hollow areas 51 arranged at intervals, each first hollow area 51 is covered by a second adhesive film 61 , and the second adhesive films 61 are arranged at intervals.

[0040] The first release paper 41 has a plurality of first hollow areas 51 arranged at intervals, which facilitates multiple repeated tests through one sample preparation, thereby improving the reliability of the test results.

[0041] In some embodiments, the first hollow areas 51 have the same shape and size.

[0042] In some embodiments, the plurality of first hollow regions 51 are sequentially arranged along the second direction, and the second direction intersects the first direction.

[0043] Refer again Figure 1 、 Figure 2 As shown, illustratively, Figure 1 、 Figure 2 The Y direction is the second direction.

[0044] In some embodiments, the second direction is perpendicular to the first direction.

[0045] In some embodiments, the projection of the first hollow area 51 on the surface of the photovoltaic glass 1 is a rectangle.

[0046] In some embodiments, the length of the rectangle is 50 mm to 200 mm.

[0047] Optionally, the length of the rectangle is 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm or 200mm. Alternatively, the length of the rectangle can also be within the range between any two of the above lengths.

[0048] In some embodiments, the width of the rectangle is 5 mm to 20 mm.

[0049] Optionally, the width of the rectangle is 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm. Alternatively, the width of the rectangle can also be within the range between any two of the above widths.

[0050] In some embodiments, the photovoltaic glass 1 further includes a second region spaced apart from the first region. The photovoltaic module peel strength test specimen further includes a third adhesive film 22, a second release paper 42, and a second photovoltaic backsheet 72, sequentially stacked within the second region. The second release paper 42 has a second hollow region 52, which is covered by the second photovoltaic backsheet 72. A portion of the second photovoltaic backsheet 72 is connected to the third adhesive film 22 via the second hollow region 52.

[0051] When performing a peel strength test, tension can be applied to the second photovoltaic backsheet 72 to separate the second photovoltaic backsheet 72 and the third adhesive film 22 in the second hollow area 52, that is, the peel strength between the adhesive film and the backsheet in a specific area can be tested.

[0052] In some embodiments, the second hollow region 52 extends along the first direction, and the length of the second photovoltaic backsheet 72 in the first direction is greater than the length of the second hollow region 52 .

[0053] In the first direction, the length of the second photovoltaic backsheet 72 is greater than the length of the second hollow area 52. On the premise that the second photovoltaic backsheet 72 covers the second hollow area 52, the second photovoltaic backsheet 72 is at least partially arranged on the surface of the second isolation paper 42, which is convenient for clamping the second photovoltaic backsheet 72 and applying tension during testing, thereby facilitating testing.

[0054] In some embodiments, at least one end of the second release paper 42 in the first direction protrudes from an edge of the second photovoltaic backsheet 72 .

[0055] At least one end of the second isolation paper 42 in the first direction protrudes from the edge of the second photovoltaic backsheet 72, and a mark can be formed on the second isolation paper 42 exposed at the edge of the second photovoltaic backsheet 72 to mark between which two layers the second isolation paper 42 is set, thereby marking the test object of the peel strength test to facilitate the test.

[0056] In some embodiments, one end of the second release paper 42 in the first direction protrudes from the edge of the second photovoltaic backsheet 72 .

[0057] In some embodiments, at least one end of the second photovoltaic backsheet 72 in the first direction protrudes from the edge of the second release paper 42 , and one end of the second photovoltaic backsheet 72 protruding from the edge of the second release paper 42 is connected to the third adhesive film 22 .

[0058] One end of the second photovoltaic backsheet 72 protruding from the edge of the second isolation paper 42 is connected to the third adhesive film 22. When performing a peel strength test, when the second photovoltaic backsheet 72 and the third adhesive film 22 in the second hollow area 52 are separated along the first direction, part of the second photovoltaic backsheet 72 can still remain adhered to the third adhesive film 22, which can improve the accuracy of the test.

[0059] In some embodiments, one end of the second photovoltaic backsheet 72 in the first direction protrudes from an edge of the second release paper 42 .

[0060] In some embodiments, the second release paper 42 has a plurality of second hollow regions 52 that are spaced apart, each second hollow region 52 is covered by a second photovoltaic backsheet 72 , and the second photovoltaic backsheets 72 are spaced apart.

[0061] In some embodiments, the second hollow areas 52 have the same shape and size.

[0062] In some embodiments, the plurality of second hollow areas 52 are sequentially arranged along the second direction.

[0063] In some embodiments, the projection of the second hollow area 52 on the surface of the photovoltaic glass 1 is a rectangle.

[0064] In some embodiments, the length of the rectangle is 50 mm to 200 mm.

[0065] Optionally, the length of the rectangle is 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm or 200mm. Alternatively, the length of the rectangle can also be within the range between any two of the above lengths.

[0066] In some embodiments, the width of the rectangle is 5 mm to 20 mm.

[0067] Optionally, the width of the rectangle is 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm. Alternatively, the width of the rectangle can also be within the range between any two of the above widths.

[0068] In some embodiments, the photovoltaic glass 1 further includes a third region separated from the first region. The photovoltaic module peel strength test specimen further includes a third release paper 43, a fourth adhesive film 62, and a third photovoltaic backsheet 73, which are sequentially stacked within the third region. The third release paper 43 has a third hollow region 53, and the fourth adhesive film 62 covers the third hollow region 53. A portion of the fourth adhesive film 62 is connected to the photovoltaic glass 1 through the third hollow region 53.

[0069] When conducting a peel strength test, tension can be applied to the fourth adhesive film 62 and the third photovoltaic backplane 73 to separate the fourth adhesive film 62 and the photovoltaic glass 1 in the third hollow area 53, that is, the peel strength between the adhesive film and the photovoltaic glass 1 in a specific area can be tested.

[0070] In some embodiments, the third hollow region 53 extends along the first direction, and the length of the fourth adhesive film 62 in the first direction is greater than the length of the third hollow region 53 .

[0071] In the first direction, the length of the fourth adhesive film 62 is greater than the length of the third hollow area 53. On the premise that the fourth adhesive film 62 covers the third hollow area 53, the fourth adhesive film 62 is at least partially arranged on the surface of the third isolation paper 43, which is convenient for clamping the fourth adhesive film 62 and the third photovoltaic backboard 73 and applying tension during testing, thereby facilitating testing.

[0072] In some embodiments, at least one end of the third release paper 43 in the first direction protrudes from an edge of the third photovoltaic backsheet 73 .

[0073] At least one end of the third isolation paper 43 in the first direction protrudes from the third photovoltaic backsheet 73, and a mark can be formed on the third isolation paper 43 exposed at the edge of the third photovoltaic backsheet 73 to mark between which two layers the third isolation paper 43 is set, thereby marking the test object of the peel strength test to facilitate the test.

[0074] In some embodiments, one end of the third release paper 43 in the first direction protrudes from the edge of the third photovoltaic backsheet 73 .

[0075] In some embodiments, at least one end of the fourth adhesive film 62 in the first direction protrudes from the edge of the third release paper 43 , and one end of the fourth adhesive film 62 protruding from the edge of the third release paper 43 is connected to the photovoltaic glass 1 .

[0076] One end of the fourth adhesive film 62 protruding from the edge of the third isolation paper 43 is connected to the photovoltaic glass 1. When performing a peel strength test, when the fourth adhesive film 62 and the photovoltaic glass 1 in the third hollow area 53 are separated along the first direction, part of the fourth adhesive film 62 and the photovoltaic glass 1 can still be kept adhered, which can improve the accuracy of the test.

[0077] In some embodiments, one end of the fourth adhesive film 62 in the first direction protrudes from the edge of the third release paper 43 .

[0078] In some embodiments, the third release paper 43 has a plurality of third hollow areas 53 arranged at intervals, each third hollow area 53 is covered by a fourth adhesive film 62 , and the fourth adhesive films 62 are arranged at intervals.

[0079] In some embodiments, the third hollow areas 53 have the same shape and size.

[0080] In some embodiments, the plurality of third hollow areas 53 are sequentially arranged along the second direction.

[0081] In some embodiments, the projection of the third hollow area 53 on the surface of the photovoltaic glass 1 is a rectangle.

[0082] In some embodiments, the length of the rectangle is 50 mm to 200 mm.

[0083] Optionally, the length of the rectangle is 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm or 200mm. Alternatively, the length of the rectangle can also be within the range between any two of the above lengths.

[0084] In some embodiments, the width of the rectangle is 5 mm to 20 mm.

[0085] Optionally, the width of the rectangle is 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm. Alternatively, the width of the rectangle can also be within the range between any two of the above widths.

[0086] In some embodiments, the photovoltaic glass 1 includes a first region, a second region, and a third region that are spaced apart.

[0087] In some embodiments, the first hollow area 51 , the second hollow area 52 , and the third hollow area 53 are all the same in shape and size.

[0088] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the patent in this application shall be based on the appended claims, and the specification and drawings may be used to interpret the claims.

Claims

1. A photovoltaic module peel strength test specimen, characterized in that: include: Photovoltaic glass (1), the photovoltaic glass (1) comprising a first region; and a first adhesive film (21), a battery cell (3), a first release paper (41), a second adhesive film (61), and a first photovoltaic backsheet (71) stacked in sequence within the first region; The first isolation paper (41) has a first hollow area (51) extending along a first direction, the second adhesive film (61) covers the first hollow area (51), and a portion of the second adhesive film (61) is connected to the battery cell (3) through the first hollow area (51).

2. The photovoltaic module peel strength test specimen according to claim 1, characterized in that: The length of the second adhesive film (61) in the first direction is greater than the length of the first hollow area (51).

3. The photovoltaic module peel strength test specimen according to claim 2, characterized in that: At least one end of the first isolation paper (41) in the first direction protrudes from the edge of the first photovoltaic backsheet (71).

4. The photovoltaic module peel strength test specimen according to claim 2, characterized in that: At least one end of the second adhesive film (61) in the first direction protrudes from the edge of the first release paper (41), and the end of the second adhesive film (61) protruding from the edge of the first release paper (41) is connected to the battery cell (3).

5. The photovoltaic module peel strength test specimen according to claim 1, characterized in that: The first release paper (41) has a plurality of first hollow areas (51) arranged at intervals, each of the first hollow areas (51) is covered by a second adhesive film (61), and the second adhesive films (61) are arranged at intervals.

6. The photovoltaic module peel strength test specimen according to claim 4, characterized in that: The first hollow areas (51) are of the same shape and size.

7. The photovoltaic module peel strength test specimen according to claim 1, characterized in that: The photovoltaic glass (1) further comprises a second region spaced apart from the first region; the photovoltaic module peel strength test specimen further comprises a third adhesive film (22), a second release paper (42), and a second photovoltaic backsheet (72) sequentially stacked in the second region; The second isolation paper (42) has a second hollow area (52), the second photovoltaic backsheet (72) covers the second hollow area (52), and a portion of the second photovoltaic backsheet (72) is connected to the third adhesive film (22) via the second hollow area (52).

8. The photovoltaic module peel strength test specimen according to claim 7, characterized in that: The second hollow area (52) extends along the first direction, and the length of the second photovoltaic backsheet (72) in the first direction is greater than the length of the second hollow area (52).

9. The photovoltaic module peel strength test specimen according to claim 1, characterized in that: The photovoltaic glass (1) further comprises a third region spaced apart from the first region; the photovoltaic module peel strength test specimen further comprises a third release paper (43), a fourth adhesive film (62), and a third photovoltaic backsheet (73) sequentially stacked in the third region; The third release paper (43) has a third hollow area (53), the fourth adhesive film (62) covers the third hollow area (53), and a portion of the fourth adhesive film (62) is connected to the photovoltaic glass (1) through the third hollow area (53).

10. The peel strength test specimen according to claim 9, characterized in that: The third hollow area (53) extends along the first direction, and the length of the fourth adhesive film (62) in the first direction is greater than the length of the third hollow area (53).

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