Photovoltaic adhesive film and photovoltaic module

Abstract

This utility model relates to the field of photovoltaic technology, and more particularly to a photovoltaic encapsulant film and a photovoltaic module. The photovoltaic encapsulant film includes a first encapsulant film body, a second encapsulant film body, and a third encapsulant film body connected sequentially along a first direction. The first and third encapsulant film bodies have identical structures. The first encapsulant film body includes at least an inner layer and an outer layer, which are stacked along a second direction perpendicular to the first direction. The pre-crosslinking degree of the inner layer is greater than that of the outer layer. The inner layer is configured to be bonded to the solder strip at the edge of the photovoltaic module along the first direction, and the outer layer is configured to be bonded to the backsheet of the photovoltaic module. This photovoltaic encapsulant film can reduce solder strip misalignment in the edge region of the photovoltaic module, improving the safety and product yield of the photovoltaic module.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic encapsulant film and a photovoltaic module. Background Technology

[0002] Currently, in the field of photovoltaic technology, busbar-less technology has become a research hotspot due to its ability to effectively improve cell conversion efficiency. Among them, film coating, as an important method for realizing busbar-less technology, has gained widespread attention and application due to its advantages of low temperature and low stress. At the same time, back-contact cells, due to their unique structure in which the positive and negative electrodes are arranged in a cross pattern on one side of the cell, occupy an important position in the encapsulation and performance optimization of photovoltaic modules. The metal interconnect encapsulation process is a key link in the production of back-contact photovoltaic modules, and its reliability directly affects the production yield and service life of photovoltaic modules.

[0003] In existing technologies, the adhesion of the carrier film to the battery cells in the low-temperature process of film interconnection is weak before lamination. The vacuuming process during lamination can easily cause the solder ribbons in the edge area of ​​the photovoltaic module to shift. The special electrode arrangement of the back contact photovoltaic module (both the positive and negative electrodes are located on the back of the photovoltaic module) makes the solder ribbon shifting very likely to cause a short circuit between the positive and negative electrodes, which seriously affects the production yield of the photovoltaic module.

[0004] Therefore, there is an urgent need to design a photovoltaic encapsulant film and photovoltaic module to solve the above technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a photovoltaic encapsulant film and a photovoltaic module that can reduce the phenomenon of solder strip misalignment in the edge area of ​​the photovoltaic module, thereby improving the safety and product yield of the photovoltaic module.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On the one hand, this utility model provides a photovoltaic encapsulant film, including a first encapsulant film body, a second encapsulant film body and a third encapsulant film body connected sequentially along a first direction, wherein the first encapsulant film body and the third encapsulant film body have the same structure;

[0008] The first adhesive film body includes at least an inner layer and an outer layer, the inner layer and the outer layer are stacked along a second direction perpendicular to the first direction, wherein the pre-crosslinking degree of the inner layer is greater than that of the outer layer;

[0009] The inner layer is configured to be bonded to the solder strip at the edge of the photovoltaic module along the first direction, and the outer layer is configured to be bonded to the backsheet of the photovoltaic module.

[0010] As an optional technical solution for photovoltaic encapsulant films, the pre-crosslinking degree of the inner layer is greater than 5%, and the pre-crosslinking degree of the outer layer is not more than 5%.

[0011] As an optional technical solution for photovoltaic encapsulant films, the first encapsulant film body, the second encapsulant film body, and the third encapsulant film body all have the same thickness.

[0012] As an optional technical solution for photovoltaic encapsulant film, the ratio of the thickness of the inner layer to the thickness of the outer layer is set to 1.1-2.0.

[0013] As an optional technical solution for photovoltaic encapsulant film, the second encapsulant film body and the inner layer are both ethylene-vinyl acetate copolymer encapsulant films, and the outer layer is a thermosetting encapsulant film.

[0014] As an optional technical solution for photovoltaic encapsulant films, the outer layer is one of ethylene-vinyl acetate copolymer encapsulant film, polyolefin encapsulant film, or polyvinyl butyral encapsulant film.

[0015] On the other hand, this utility model also provides a photovoltaic module, which includes a battery cell, a backsheet, and a photovoltaic encapsulant film as described in any of the above optional technical solutions. The battery cell includes a plurality of battery strings arranged in a preset pattern. The photovoltaic encapsulant film is applied between the backsheet and the battery cell, and the inner layer of the photovoltaic encapsulant film is bonded to the solder strips on the battery string at the edge along the first direction, and the outer layer of the photovoltaic encapsulant film is bonded to the backsheet.

[0016] As an optional technical solution for photovoltaic modules, the photovoltaic module further includes a first adhesive layer and a second adhesive layer. The first adhesive layer and the second adhesive layer are both disposed on the side of the back sheet facing the photovoltaic encapsulant film. The first adhesive layer is bonded to the first encapsulant film body and the second encapsulant film body, and the second adhesive layer is bonded to the third encapsulant film body and the second encapsulant film body.

[0017] As an optional technical solution for photovoltaic modules, a reflective layer is provided on the side of the first adhesive layer and / or the second adhesive layer facing the photovoltaic film. The reflective layer is configured to reflect incident light from the side of the photovoltaic module to the battery cell.

[0018] As an optional technical solution for photovoltaic modules, the first adhesive layer includes a plurality of first adhesive portions, and the second adhesive layer includes a plurality of second adhesive portions. The plurality of first adhesive portions are spaced apart along a third direction, and the plurality of second adhesive portions are spaced apart along a third direction; the third direction is perpendicular to both the first direction and the second direction.

[0019] The beneficial effects of this utility model include at least the following:

[0020] This invention provides a photovoltaic encapsulant film, comprising a first encapsulant film body, a second encapsulant film body, and a third encapsulant film body connected sequentially along a first direction. The first and third encapsulant film bodies have identical structures. The first encapsulant film body includes at least an inner layer and an outer layer, which are stacked along a second direction perpendicular to the first direction. The pre-crosslinking degree of the inner layer is greater than that of the outer layer. The inner layer is configured to be bonded to a solder strip at the edge of the photovoltaic module along the first direction, and the outer layer is configured to be bonded to the backsheet of the photovoltaic module.

[0021] The inner layer has a high degree of pre-crosslinking, enabling it to form a certain microstructure (crosslinked network). This increases the bonding area and mechanical interlocking effect with the solder ribbons at the edges of the photovoltaic module along the first direction, providing stronger adhesive strength and ensuring a tight bond between the inner layer and the solder ribbons at the photovoltaic module edges. This reduces the possibility of solder ribbon misalignment at the edges due to external forces (such as vacuuming) during lamination. The outer layer has a lower degree of pre-crosslinking, offering better flexibility and adaptability, allowing for good adhesion to the backsheet of the photovoltaic module, thus forming a stable encapsulation structure. This difference in pre-crosslinking degree between the inner and outer layers allows the inner layer to provide high adhesive strength, while the outer layer provides good flexibility and adaptability, thereby reducing solder ribbon misalignment at the photovoltaic module edges and improving the safety and yield of the photovoltaic module.

[0022] This invention provides a photovoltaic module that can reduce the phenomenon of solder strip misalignment in the edge area of ​​the photovoltaic module, thereby improving the safety and product yield of the photovoltaic module. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the photovoltaic encapsulant film provided in this embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the photovoltaic module provided in this embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the first adhesive layer and the reflective layer provided in this embodiment of the present invention;

[0027] Figure 4 This is a top view of the photovoltaic film laid on the battery cell according to an embodiment of the present invention.

[0028] Figure Labels

[0029] 10. First adhesive film body; 11. Inner layer; 12. Outer layer; 20. Second adhesive film body; 30. Third adhesive film body; 40. Battery unit; 41. Battery string; 42. Overlapping area; 50. Backplate; 51. First adhesive layer; 52. Second adhesive layer; 53. Reflective layer; 60. Front adhesive film; 70. Front glass. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] This embodiment provides a photovoltaic encapsulant film and a photovoltaic module, which can reduce the phenomenon of solder strip misalignment in the edge area of ​​the photovoltaic module, and improve the safety and product yield of the photovoltaic module.

[0038] like Figures 1-4 As shown, the photovoltaic encapsulant film mainly includes a first encapsulant film body 10, a second encapsulant film body 20, and a third encapsulant film body 30 connected sequentially along a first direction. The first encapsulant film body 10 and the third encapsulant film body 30 have the same structure. The first encapsulant film body 10 includes at least an inner layer 11 and an outer layer 12, which are stacked along a second direction perpendicular to the first direction. The pre-crosslinking degree of the inner layer 11 is greater than that of the outer layer 12. The inner layer 11 is configured to be bonded to the solder strip at the edge of the photovoltaic module along the first direction, and the outer layer 12 is configured to be bonded to the backsheet 50 of the photovoltaic module.

[0039] Based on the above design, the inner layer 11 has a high degree of pre-crosslinking, enabling it to form a certain microstructure (crosslinking network). This increases the bonding area and mechanical interlocking effect with the solder ribbons at the edges of the photovoltaic module along the first direction, thus providing stronger bonding strength. This ensures a tight bond between the inner layer 11 and the solder ribbons at the edges of the photovoltaic module, reducing the possibility of solder ribbon misalignment at the edges due to external forces (such as vacuuming) during lamination. The outer layer 12 has a lower degree of pre-crosslinking, providing better flexibility and adaptability, and can bond well with the backsheet 50 of the photovoltaic module, forming a stable encapsulation structure. This difference in pre-crosslinking degree between the inner layer 11 and the outer layer 12 allows the inner layer 11 to provide high bonding strength, while the outer layer 12 provides good flexibility and adaptability, thereby reducing solder ribbon misalignment at the edges of the photovoltaic module and improving the safety and yield of the photovoltaic module.

[0040] It should be noted that the first direction is... Figure 1 The X-axis direction is the width direction of the photovoltaic module, and the second direction is... Figure 1 The Y-axis direction in the image is the thickness direction of the photovoltaic film.

[0041] In some alternative embodiments, the first adhesive film body 10, the second adhesive film body 20, and the third adhesive film body 30 are integrally formed or spliced ​​together.

[0042] In some alternative embodiments, the degree of pre-crosslinking of the inner layer 11 and the outer layer 12 can be achieved by one or a combination of corona treatment, electron irradiation, and ultraviolet irradiation.

[0043] In some alternative embodiments, the pre-crosslinking degree of the inner layer 11 is greater than 5%, and the pre-crosslinking degree of the outer layer 12 is no more than 5%. By limiting the pre-crosslinking degree of the inner layer 11 to greater than 5% and the pre-crosslinking degree of the outer layer 12 to no more than 5%, the inner layer 11 has a higher degree of crosslinking, thereby providing stronger adhesion performance, ensuring a firm bond with the solder ribbon at the edge of the photovoltaic module, and preventing the solder ribbon from shifting due to external forces during lamination. The pre-crosslinking degree of the outer layer 12 is no more than 5%, maintaining good flexibility, and being able to better adapt to the shape and stress changes of the backsheet 50, ensuring a stable bond between the photovoltaic film and the backsheet 50.

[0044] For example, the pre-crosslinking degree of the inner layer 11 can be set to 8%, and the pre-crosslinking degree of the outer layer 12 can be set to 2%.

[0045] Optionally, in this embodiment, the first encapsulant film body 10, the second encapsulant film body 20, and the third encapsulant film body 30 all have the same thickness. This results in a uniform thickness distribution of the photovoltaic encapsulant film, which helps to form a uniform stress distribution during the photovoltaic module encapsulation process and reduces local stress concentration caused by uneven thickness of the photovoltaic encapsulant film. Uniform thickness also ensures good adhesion between the photovoltaic encapsulant film and various parts of the photovoltaic module during lamination, improving encapsulation quality and further reducing the possibility of solder ribbon misalignment.

[0046] For example, the thickness of the first adhesive film body 10, the second adhesive film body 20 and the third adhesive film body 30 are all set to 0.4 mm.

[0047] In some optional embodiments, the ratio of the thickness of the inner layer 11 to the thickness of the outer layer 12 is set to 1.1-2.0. When this ratio is less than 1.1, the thickness of the inner layer 11 is insufficient, making it difficult to provide sufficient adhesive strength, reducing the constraint effect on the solder strips at the edges, and increasing the risk of solder strip misalignment. When this ratio is greater than 2.0, the thickness of the outer layer 12 is too thin, resulting in insufficient adhesive stability with the backsheet 50, which can easily lead to overall displacement of the photovoltaic film and increase the risk of solder strip misalignment. Therefore, setting this ratio between 1.1 and 2.0 can ensure both the adhesive stability of the inner layer 11 and the adhesiveness of the outer layer 12, reducing the risk of solder strip misalignment at the edges.

[0048] For example, the thickness of the inner layer 11 can be set to 0.24 mm, and the thickness of the outer layer 12 can be set to 0.2 mm.

[0049] In some alternative embodiments, the second film body 20 and the inner layer 11 are both ethylene-vinyl acetate copolymer (EVA) films. The outer layer 12 is a thermosetting encapsulation film, for example, the outer layer 12 is one of ethylene-vinyl acetate copolymer films, polyolefin films, or polyvinyl butyral (PVB) films.

[0050] EVA film possesses excellent adhesion and optical transparency, effectively bonding solder ribbons as the inner layer while allowing light to pass through, thus ensuring the optical performance of the photovoltaic module. Polyolefin film exhibits good weather resistance and mechanical properties, while PVB film offers superior optical and adhesion properties.

[0051] For example, for different application scenarios, the corresponding outer layer 12 material is selected. For instance, polyolefin film is selected in outdoor high ultraviolet radiation environments, and PVB film is selected in scenarios requiring high optical transmittance.

[0052] like Figures 2-4As shown, this embodiment also provides a photovoltaic module, which includes a battery cell 40, a backsheet 50, and the aforementioned photovoltaic encapsulant film. The battery cell 40 includes multiple battery strings 41 arranged in a preset pattern. The photovoltaic encapsulant film is applied between the backsheet 50 and the battery cell 40, with the inner layer 11 of the photovoltaic encapsulant film bonded to the solder ribbons on the battery strings 41 at the edge along a first direction, and the outer layer 12 of the photovoltaic encapsulant film bonded to the backsheet 50. This allows the photovoltaic encapsulant film to directly act between the solder ribbons and the backsheet 50. During the lamination process, the high pre-crosslinking degree of the inner layer 11 provides greater adhesive strength, firmly fixing the solder ribbons at the edge to the grid lines of the battery cells, preventing them from shifting under external forces during the lamination process. The outer layer 12 ensures stable adhesion between the encapsulant film and the backsheet 50, forming an integrated encapsulation structure, improving the reliability and safety of the photovoltaic module.

[0053] For example, in this embodiment, the battery cell 40 is a set of 12 back-contact battery strings 41 (20 cells per string), and the solder strip is a copper strip with a diameter of 0.3 mm. The backplate 50 is tempered glass.

[0054] It should be noted that in this embodiment, the second adhesive film body 20 of the photovoltaic encapsulant film is used to cover and bond most of the area of ​​the battery cell 40, and the inner layer 11 of the first adhesive film body 10 and the inner layer 11 of the third adhesive film body 30 are respectively used to bond and fix a welding strip at the edge of the battery cell 40 along the first direction. In other words, as Figure 4 As shown, there is a solder strip in the overlapping area 42 of the inner layer 11 of the photovoltaic film and the battery string 41 at the edge, and the inner layer 11 firmly bonds this solder strip to the battery cell.

[0055] like Figures 2-3 As shown, the photovoltaic module in this embodiment further includes a first adhesive layer 51 and a second adhesive layer 52. Both the first adhesive layer 51 and the second adhesive layer 52 are disposed on the side of the backsheet 50 facing the photovoltaic film. The first adhesive layer 51 is bonded to the first film body 10 and the second film body 20, and the second adhesive layer 52 is bonded to the third film body 30 and the second film body 20. By providing the first adhesive layer 51 and the second adhesive layer 52, the contact area and adhesive force between the photovoltaic film and the backsheet 50 can be further increased, further limiting the overall displacement of the photovoltaic film during lamination, and indirectly reducing the offset phenomenon of the solder strips at the edges being dragged by the photovoltaic film.

[0056] Optionally, in this embodiment, the width of the first adhesive layer 51 along the first direction is greater than the width of the first adhesive film body 10, and the width of the second adhesive layer 52 along the first direction is greater than the width of the third adhesive film body 30, thereby increasing the bonding area and improving the stability and reliability of the photovoltaic module encapsulation.

[0057] Optionally, in this embodiment, both the first adhesive layer 51 and the second adhesive layer 52 are made of EVA material.

[0058] Furthermore, in this embodiment, a reflective layer 53 is provided on the side of the first adhesive layer 51 and / or the second adhesive layer 52 facing the photovoltaic film. The reflective layer 53 is configured to reflect incident light from the side of the photovoltaic module to the battery cell 40.

[0059] Specifically, the reflective layer 53 can first reflect incident light from the side area of ​​the photovoltaic module onto the front glass 70 or back panel 50 of the photovoltaic module, and then reflect it into the cell 40, thereby increasing the amount of light received by the cell 40 and thus improving the power generation efficiency. By reflecting light, it reduces the scattering and loss of light on the side and optimizes the optical utilization efficiency of the photovoltaic module.

[0060] For example, the reflective layer 53 can be a white coating or an aluminum-plated metal layer.

[0061] In some alternative embodiments, both the first adhesive layer 51 and the second adhesive layer 52 can be configured as continuous strips, and both the first adhesive layer 51 and the second adhesive layer 52 extend in a third direction.

[0062] Of course, the first adhesive layer 51 and the second adhesive layer 52 can also be designed intermittently. Specifically, the first adhesive layer 51 includes multiple first adhesive portions, and the second adhesive layer 52 includes multiple second adhesive portions. The multiple first adhesive portions are spaced apart along a third direction, and the multiple second adhesive portions are spaced apart along a third direction; the third direction is perpendicular to both the first and second directions. The spaced first and second adhesive portions can reduce the amount of adhesive material used, save costs, and achieve the goal of lightweight photovoltaic module design.

[0063] Understandably, third-party refers to... Figure 4 The Z-axis direction is the length direction of the photovoltaic module.

[0064] The photovoltaic module in this embodiment also includes a front glass 70 and a front encapsulating film 60, wherein the front glass 70, the front encapsulating film 60, the battery cell 40, the back encapsulating film (i.e., the photovoltaic encapsulating film in this embodiment) and the back sheet 50 are stacked sequentially along the light incident direction.

[0065] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0066] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A photovoltaic encapsulant film, characterized in that, It includes a first adhesive film body (10), a second adhesive film body (20) and a third adhesive film body (30) connected sequentially along a first direction, wherein the first adhesive film body (10) and the third adhesive film body (30) have the same structure; The first adhesive film body (10) includes at least an inner layer (11) and an outer layer (12), wherein the inner layer (11) and the outer layer (12) are stacked along a second direction perpendicular to the first direction, wherein the pre-crosslinking degree of the inner layer (11) is greater than the pre-crosslinking degree of the outer layer (12); The inner layer (11) is configured to be bonded to the solder strip at the edge of the photovoltaic module along the first direction, and the outer layer (12) is configured to be bonded to the backsheet (50) of the photovoltaic module.

2. The photovoltaic encapsulant film according to claim 1, characterized in that, The pre-crosslinking degree of the inner layer (11) is greater than 5%, and the pre-crosslinking degree of the outer layer (12) is not more than 5%.

3. The photovoltaic encapsulant film according to claim 1, characterized in that, The first adhesive film body (10), the second adhesive film body (20) and the third adhesive film body (30) all have the same thickness.

4. The photovoltaic encapsulant film according to claim 3, characterized in that, The ratio of the thickness of the inner layer (11) to the thickness of the outer layer (12) is set to 1.1-2.

0.

5. The photovoltaic encapsulant film according to claim 1, characterized in that, The second adhesive film body (20) and the inner layer (11) are both ethylene-vinyl acetate copolymer adhesive films, and the outer layer (12) is a thermosetting encapsulation adhesive film.

6. The photovoltaic encapsulant film according to claim 5, characterized in that, The outer layer (12) is one of ethylene-vinyl acetate copolymer film, polyolefin film or polyvinyl butyral film.

7. A photovoltaic module, characterized in that, The photovoltaic module includes a battery cell (40), a backsheet (50), and a photovoltaic encapsulant film according to any one of claims 1-6. The battery cell (40) includes a plurality of battery strings (41) arranged in a preset pattern. The photovoltaic encapsulant film is applied between the backsheet (50) and the battery cell (40), and the inner layer (11) of the photovoltaic encapsulant film is bonded to the solder strip on the battery string (41) at the edge along the first direction. The outer layer (12) of the photovoltaic encapsulant film is bonded to the backsheet (50).

8. The photovoltaic module according to claim 7, characterized in that, The photovoltaic module further includes a first adhesive layer (51) and a second adhesive layer (52). The first adhesive layer (51) and the second adhesive layer (52) are both disposed on the side of the back sheet (50) facing the photovoltaic film. The first adhesive layer (51) is bonded to the first film body (10) and the second film body (20), and the second adhesive layer (52) is bonded to the third film body (30) and the second film body (20).

9. The photovoltaic module according to claim 8, characterized in that, The first adhesive layer (51) and / or the second adhesive layer (52) are provided with a reflective layer (53) on the side facing the photovoltaic film, and the reflective layer (53) is configured to reflect incident light from the side of the photovoltaic module to the battery cell (40).

10. The photovoltaic module according to claim 8, characterized in that, The first adhesive layer (51) includes a plurality of first adhesive portions, and the second adhesive layer (52) includes a plurality of second adhesive portions. The plurality of first adhesive portions are spaced apart along a third direction, and the plurality of second adhesive portions are spaced apart along a third direction. The third direction is perpendicular to both the first direction and the second direction.

Images