Solar cell module and photovoltaic system

Abstract

The utility model is applicable to the technical field of solar cells, and provides a solar cell module and a photovoltaic system, the solar cell module comprises a first cover plate, a first adhesive film, a cell string, a second adhesive film and a second cover plate, the cell string comprises a plurality of cell sheets, and each cell sheet comprises a first surface and a second surface; two adjacent battery pieces are connected through the welding strips, the welding strips extend in the first direction, the welding strips are arranged at intervals in the second direction, and each welding strip comprises a first welding part arranged on the first surface; and the first pre-fixing film is arranged on the first welding part and fixedly connected with the first surface, the first pre-fixing film comprises a main body part and an extension part which is connected with the main body part and extends to the outer side of the edge of the battery piece, and the extension part is bent towards the direction far away from the second surface relative to the main body part and is connected with the first adhesive film and the second adhesive film. According to the solar cell module, the fixing effect of the pre-fixing film on the welding strip can be improved, and the reliability of the solar cell module is improved.

Description

Technical Field

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

[0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. Under sunlight, a photocurrent is generated inside the solar cell, which outputs electrical energy through electrodes. In recent years, solar cell manufacturing technology has continuously improved, production costs have been decreasing, and conversion efficiency has been increasing. Solar cell power generation is becoming increasingly widespread and has become an important energy source for electricity supply.

[0003] In existing technologies, to reduce the cost of solar cell paste, gridless solar cells have emerged on the market. These cells have fine grid lines printed on them. When assembling solar cells into a module, solder ribbons are used to directly connect the grid lines. A pre-fixing film is placed on the cell and heated to melt it, bonding it to the cell surface and thus fixing the solder ribbons to the cell, achieving connection between cells. However, after lamination to form the solar cell module, if the pre-fixing film does not extend beyond the cell edge, its fixation is unstable, leading to unstable solder ribbon fixation and affecting the reliability of the solar cell module. Utility Model Content

[0004] This invention provides a solar cell module, aiming to solve the problem in the prior art where the pre-fixed film is not firmly fixed, resulting in unstable solder ribbon fixation and affecting the reliability of the solar cell module.

[0005] This utility model is implemented as follows: it includes a first cover plate, a first adhesive film, at least one battery string, a second adhesive film, and a second cover plate stacked sequentially. The battery string includes:

[0006] A plurality of battery cells are spaced apart along a first direction, each battery cell including a first surface and a second surface disposed opposite to each other;

[0007] A plurality of welding strips are provided, with adjacent battery cells connected by the welding strips. The welding strips extend along a first direction, and the plurality of welding strips are spaced apart along a second direction, which intersects the first direction. Each welding strip includes a first welding portion disposed on the first surface.

[0008] A plurality of first pre-fixing films are provided, each first pre-fixing film being disposed on a corresponding battery cell. The first pre-fixing film is disposed on the first welding portion and fixedly connected to the first surface. A second adhesive film covers the first pre-fixing film. The first pre-fixing film includes a main body portion covering the first surface and at least one extension portion connected to the main body portion and extending to the outer edge of the battery cell. The extension portion is at least partially bent relative to the main body portion in a direction away from the plane where the second surface is located. The extension portion is connected to the first adhesive film and the second adhesive film.

[0009] Preferably, the battery cell includes a first grid line and a second grid line disposed on the first surface, the first grid line and the second grid line being spaced apart along the first direction, and the polarities of the first grid line and the second grid line being opposite;

[0010] The welding strip includes two first welding portions and a connecting portion connecting the two first welding portions. One first welding portion is connected to a first grid line on one of the battery cells, and the other first welding portion is connected to a second grid line on another of the battery cells.

[0011] Preferably, each of the epitaxial portions includes:

[0012] A first extension portion connected to the main body portion is bent relative to the main body portion in a direction away from the plane where the second surface is located, and the first extension portion is located on the side of the first surface away from the second surface.

[0013] Preferably, each of the epitaxial portions further includes:

[0014] A second extension is connected to the first extension, the second extension extends from the first extension in a direction away from the battery cell, and the second extension is connected between the first adhesive film and the second adhesive film.

[0015] Preferably, the first extension includes a connecting surface connected to the first adhesive film. The connecting surface includes a first end disposed near the battery cell and a second end disposed away from the battery cell. The vertical distance from the first end of the connecting surface to the plane containing the second surface is less than the vertical distance from the second end of the connecting surface to the plane containing the second surface.

[0016] Preferably, the vertical distance from the connecting surface to the plane containing the second surface gradually increases from the first end to the second end.

[0017] Preferably, the connecting surface of the first extension is an inclined surface or an arc surface.

[0018] Preferably, the first pre-fixed membrane further includes:

[0019] A raised structure is provided on the extension portion, and the raised structure is connected to the first adhesive film and / or the second adhesive film.

[0020] Preferably, the protrusion structure is disposed on the surface of the extension portion near the first adhesive film, and the protrusion structure is embedded in the first adhesive film.

[0021] Preferably, the battery cell includes a first battery edge and a second battery edge disposed opposite to each other along the first direction;

[0022] The extended portion includes a first extended portion and a second extended portion, which are respectively disposed at opposite ends of the main body portion along the first direction. The first extended portion extends from the main body portion to the outer side of the edge of the first battery, and the second extended portion extends from the main body portion to the outer side of the edge of the second battery.

[0023] Preferably, the battery cell includes a third battery edge and a fourth battery edge disposed opposite to each other along the second direction; the extension portion includes a third extension portion and a fourth extension portion, the third extension portion and the fourth extension portion being respectively connected to opposite ends of the main body portion along the second direction, the third extension portion extending from the main body portion to the outside of the third battery edge, and the fourth extension portion extending from the main body portion to the outside of the fourth battery edge.

[0024] Preferably, the epitaxial portions of two adjacent first pre-fixed films within the battery string are connected.

[0025] This invention also provides a photovoltaic system, including the aforementioned solar cell module.

[0026] This utility model provides a solar cell module by setting a first pre-fixing film on the first surface of the cell. The first pre-fixing film is used to fix the solder ribbon on the first surface. The first pre-fixing film includes a main body and an extension portion connected to the main body and extending to the outside of the cell. The main body covers and fixes the first pre-fixing film on the first surface. At the same time, the extension portion connects the first adhesive film and the second adhesive film, increasing the fixing area of ​​the first pre-fixing film and making the fixing of the first pre-fixing film more stable. Moreover, at least part of the extension portion is bent relative to the main body in a direction away from the plane where the second surface is located. The bent extension portion forms a limiting fit with the first adhesive film and the second adhesive film, which helps to increase the bonding force between the extension portion and the first adhesive film and the second adhesive film. This can effectively prevent the first pre-fixing film from loosening, greatly improve the fixing reliability of the first pre-fixing film, and thus improve the fixing effect of the first pre-fixing film on the solder ribbon. Attached Figure Description

[0027] Figure 1 A plan view of a solar cell module provided for an embodiment of this utility model;

[0028] Figure 2 A plan view of a cell string of a solar cell module provided for an embodiment of the present utility model;

[0029] Figure 3 This is a partial structural planar schematic diagram of a solar cell module provided in an embodiment of the present invention;

[0030] Figure 4 A plan view of the individual cell connection solder strips of a solar cell module provided in an embodiment of the present invention;

[0031] Figure 5 A cross-sectional schematic diagram of the connecting strips between two adjacent cells of a solar cell module provided in an embodiment of the present invention;

[0032] Figure 6 A schematic plan view of a solar cell module after the cells are covered with a first pre-fixed film, provided as an embodiment of this utility model;

[0033] Figure 7 A cross-sectional view of a solar cell module along a first direction provided for an embodiment of this utility model;

[0034] Figure 8 This is a schematic cross-sectional view of a solar cell module along a first direction, provided as an embodiment of the present invention.

[0035] Figure 9 This is a cross-sectional view of another solar cell module provided in an embodiment of the present invention along a first direction. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of 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 the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "upper", "lower", "back", "front", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and 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.

[0038] 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.

[0039] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0040] This utility model provides a solar cell module by setting a first pre-fixing film on the first surface of the cell. The first pre-fixing film is used to fix the first welding part of the solder ribbon on the first surface. The first pre-fixing film is configured to include a main body and an extension portion connected to the main body and extending to the outside of the cell. While the first pre-fixing film is fixedly connected to the first surface by the main body, it is also connected to a first adhesive film by the extension portion, increasing the fixing area of ​​the first pre-fixing film and making the fixing of the first pre-fixing film more stable. Moreover, the extension portion is bent relative to the main body in a direction away from the plane where the second surface is located, so that the extension portion and the cell form a limiting fit, which helps to increase the bonding force between the extension portion and the cell. The bent extension portion can wrap around a part of the second adhesive film, and the bent extension portion forms a limiting fit with the first adhesive film and the second adhesive film, which helps to increase the bonding force between the extension portion and the first adhesive film and the second adhesive film. This can effectively prevent the first pre-fixing film from loosening, greatly improve the fixing reliability of the first pre-fixing film, and thus improve the fixing effect of the first pre-fixing film on the solder ribbon.

[0041] Example 1

[0042] Please refer to Figures 1-8 This utility model provides a solar cell module, including a first cover plate 1, a first encapsulating film 2, at least one cell string, a second encapsulating film 4, and a second cover plate 5 stacked sequentially. The cell string includes:

[0043] A plurality of battery cells 31 are arranged at intervals along the first direction Y. Each battery cell 31 includes a first surface 315 and a second surface 316 arranged opposite to each other.

[0044] Several welding strips 32 are used to connect adjacent battery cells 31. The welding strips 32 extend along a first direction Y, and the several welding strips 32 are spaced apart along a second direction X, which intersects with the first direction Y. Each welding strip 32 includes a first welding portion 321 disposed on a first surface 315.

[0045] A plurality of first pre-fixing films 33 are provided on a corresponding battery cell 31. The first pre-fixing film 33 is provided on the first welding part 321 and fixedly connected to the first surface 315. The second adhesive film 4 covers the first pre-fixing film 33. The first pre-fixing film 33 includes a main body part 336 covering the first surface 315 and at least one extension part 330 connected to the main body part 336 and extending to the outer edge of the battery cell 31. The extension part 330 is at least partially bent relative to the main body part 336 in a direction away from the plane where the second surface 316 is located. The extension part 330 is connected to the first adhesive film 2 and the second adhesive film 4.

[0046] In this embodiment of the invention, the solar cell module includes at least one cell string. When the solar cell module includes multiple cell strings, the multiple cell strings can be arranged in multiple rows and columns. The cells 31 within each cell string are connected in series by solder strips 32. Different cell strings can be connected in series or in parallel by busbars to achieve current collection and output. Multiple cell strings can form a cell array and are encapsulated together by a first cover plate 1, a first encapsulating film 2, a second encapsulating film 4, and a second cover plate 5 to form a solar cell module.

[0047] like Figure 1 As shown, in one embodiment of the present invention, the solar cell module includes at least one cell string unit 30, and each cell string unit 30 includes:

[0048] A first battery string 301 and a second battery string 302 are arranged at intervals along the second direction X;

[0049] The third battery string 303 and the fourth battery string 304 are arranged at intervals along the second direction X. The first battery string 301 and the third battery string 303 are arranged along the first direction Y. The second battery string 302 and the fourth battery string 304 are arranged along the first direction Y.

[0050] In this configuration, the first battery string 301 and the second battery string 302 are connected in series, the third battery string 303 and the fourth battery string 304 are connected in series, the first battery string 301 and the third battery string 303 are connected in parallel, and the second battery string 302 and the fourth battery string 304 are connected in parallel. The second battery string 302 of each battery string unit 30 is adjacent to and connected in series with the first battery string 301 of the adjacent battery string unit 30, and the fourth battery string 304 of each battery string unit 30 is adjacent to and connected in series with the third battery string 303 of the adjacent battery string unit 30.

[0051] Specifically, in each battery string unit 30, the first battery string 301 and the second battery string 302 are connected in series at one end via an edge busbar 306. The third battery string 303 and the fourth battery string 304 are also connected in series via an edge busbar 306. The first battery string 301 and the third battery string 303 are connected in parallel via an intermediate busbar 308, and the second battery string 302 and the fourth battery string 304 are connected in parallel via an intermediate busbar 308. The second battery string 302 of each battery string unit 30 is also connected in series with the first battery string 301 of the adjacent battery string unit 30 via an intermediate busbar 308. Similarly, the fourth battery string 304 of each battery string unit 30 is connected in series with the third battery string 303 of the adjacent battery string unit 30 via an intermediate busbar 308. Of course, other connection methods can also be used to achieve series and parallel connections between battery strings.

[0052] in, Figure 1Only three battery string units 30 are shown in the diagram. Each battery string unit 30 is arranged at intervals along the second direction X. Each battery string unit 30 includes the first battery string 301, the second battery string 302, the third battery string 303, and the fourth battery string 304 mentioned above.

[0053] In this embodiment of the present invention, a solar cell module is provided by providing a first pre-fixing film 33 on the first surface 315 of the cell 31 in the cell string. The first pre-fixing film 33 is used to fix the solder ribbon 32 on the first surface 315, and the solder ribbon 32 is fixed on the first surface 315 without the need for a welding process. At the same time, the first pre-fixing film 33 is configured to include a main body 336 and an extension portion 330 connected to the main body 336 and extending to the outside of the cell 31. While the first pre-fixing film 33 is fixedly connected to the first surface 315 by the main body 336, it is also connected to the first adhesive film 2 by the extension portion 330, so that the first pre-fixing film 33 is more firmly fixed, thereby improving the fixing effect of the first pre-fixing film 33 on the solder ribbon 32. Furthermore, by connecting the extension portion 330 to the first adhesive film 2, the pre-fixing effect of the first pre-fixing film 33 on the solder ribbon 32 before lamination can be improved.

[0054] Meanwhile, the extension portion 330 is bent away from the plane of the second surface 316 relative to the main body portion 336. The extension portion 330 is not parallel to the first surface 315. The bent extension portion 330 forms a limiting fit structure with the first adhesive film 2 and the second adhesive film 4, which helps to increase the bonding force between the extension portion 330 and the first adhesive film 2 and the second adhesive film 4. This can effectively prevent the first pre-fixed film 33 from loosening and greatly improve the fixing reliability of the first pre-fixed film 33 to the welding strip 32.

[0055] In this embodiment of the invention, the first surface 315 and the second surface 316 of the solar cell 31 are, respectively, light-facing and back-facing. The solar cell 31 can be a back-contact solar cell or a double-contact solar cell. Specifically, when the solar cell 31 is a back-contact solar cell, only the first surface 315 of the solar cell 31 has grid lines. For example, the solar cell 31 can be an IBC solar cell or an HBC solar cell. When the solar cell 31 is a double-contact solar cell, both the first surface 315 and the second surface 316 of the solar cell 31 have grid lines; for example, the solar cell 31 can be a Topcon solar cell.

[0056] In this embodiment of the utility model, both the first cover plate 1 and the second cover plate 5 can be glass, that is, the solar cell module can be a double-glass module; or, one of the first cover plate 1 and the second cover plate 5 can be glass, and the other can be a back sheet, that is, the solar cell module can be a single-glass module.

[0057] In this embodiment of the invention, each battery string includes multiple solder strips 32, and the specific number of solder strips 32 in each battery string is not limited and can be flexibly set according to actual application. Specifically, each solder strip 32 extends along a first direction Y, that is, the length direction of the solder strip 32 is the first direction Y, and the solder strips 32 are arranged sequentially at intervals along a second direction X.

[0058] In this embodiment of the utility model, the main body 336 completely covers the first surface 315, that is, the size of the main body 336 is the same as the size of the battery cell 31, so that the first welding part 321 of the welding ribbon 32 is fixed on the first surface 315 of the battery cell 31, and the extension part 330 extends beyond the battery edge of the battery cell 31 to connect with the first adhesive film 2 and the second adhesive film 4.

[0059] In this embodiment of the invention, a first pre-fixed film 33 is correspondingly provided on each battery cell 31 to facilitate the coating process of the first pre-fixed film 33. Each first pre-fixed film 33 forms an extension portion 330 at at least one battery edge of the battery cell 31, or the extension portion 330 can be formed at each battery edge of the battery cell 31. Specifically, the extension portion 330 is the portion of the first pre-fixed film 33 that extends beyond the edge of the battery cell 31.

[0060] Please refer to the reference. Figure 6 As an embodiment of the present invention, the battery cell 31 includes a first battery edge 311 and a second battery edge 312 disposed opposite to each other along the first direction Y;

[0061] The extension portion 330 includes a first extension portion 331 and a second extension portion 332. The first extension portion 331 and the second extension portion 332 are respectively disposed at opposite ends of the main body portion 336 along the first direction Y. The first extension portion 331 covers the first battery edge 311 and extends to the outside of the first battery edge 311, and the second extension portion 332 covers the second battery edge 312 and extends to the outside of the second battery edge 312.

[0062] In this embodiment, the solder ribbon 32 extends along the first direction Y, with at least a portion of the solder ribbon 32 extending to the outside of the first cell edge 311 and at least a portion of the solder ribbon 32 extending along the first direction Y to the outside of the second cell edge 312. The first extension portion 331 covers the position of the solder ribbon 32 extending to the outside of the first cell edge 311, and the first extension portion 331 wraps around the position of the solder ribbon 32 at the first cell edge 311, making it less likely for the solder ribbon 32 to shift position at the first cell edge 311. Simultaneously, the second extension portion 332 covers the position of the solder ribbon 32 extending to the outside of the second cell edge 312, and the second extension portion 332 wraps around the position of the solder ribbon 32 at the second cell edge 312, making it less likely for the solder ribbon 32 to shift position at the edge of the second cell 31. This significantly improves the stability of the solder ribbon 32 at both the first and second cell edges 311, further enhancing the structural reliability of the solar cell module. Furthermore, at least a portion of the solder ribbon 32 extending beyond the first battery edge 311 is covered and fixed by the first extension portion 331, and at least a portion of the solder ribbon 32 extending beyond the second battery edge 312 is covered and fixed by the second extension portion 332, preventing the solder ribbon 32 from coming loose at the first battery edge 311 and the second battery edge 312, thereby improving the fixing effect of the solder ribbon 32 at the first battery edge 311 and the second battery edge 312.

[0063] As an embodiment of the present invention, the battery cell 31 further includes a third battery edge 313 and a fourth battery edge 314 disposed opposite to each other along the second direction X; the extension portion 330 includes a third extension portion 333 and a fourth extension portion 334, the third extension portion 333 and the fourth extension portion 334 are respectively connected to opposite ends of the main body portion 336 along the second direction X, the third extension portion 333 covers the third battery edge 313 and extends to the outside of the third battery edge 313, and the fourth extension portion 334 covers the fourth battery edge 314 and extends to the outside of the fourth battery edge 314.

[0064] In this embodiment, the first pre-fixed film 33 is connected to the first adhesive film 2 and the second adhesive film 4 respectively by the third extension portion 333 and the fourth extension portion 334 distributed along the second direction X. The bent third extension portion 333 and the fourth extension portion 334 form a limiting fit structure with the solar cell 31, thereby realizing the limiting fixation of the first pre-fixed film 33 in the first direction Y and the second direction X. This can further improve the fixing effect of the first pre-fixed film 33, further improve the fixing stability of the solder ribbon 32, and improve the reliability of the solar cell module.

[0065] The structures of each of the extension portions 330 are the same, that is, the structures of the first extension portion 331, the second extension portion 332, the third extension portion 333 and the fourth extension portion 334 are the same; of course, in some possible embodiments, the structures of each extension portion 330 may also be different.

[0066] As an embodiment of the present invention, the first pre-fixed film 33 includes at least one of PVB film, EVA film, EPE film, EP film and POE film.

[0067] The first pre-fixed membrane 33 can be one of PVB membrane, EVA membrane, EPE membrane, EP membrane, and POE membrane, or it can be a laminate of at least two of PVB membrane, EVA membrane, EPE membrane, EP membrane, and POE membrane. The material of the PVB membrane is polyvinyl butyral (PVB), the material of the EVA membrane is ethylene-vinyl acetate copolymer (EVA), the material of the POE membrane is polyolefin elastomer (POE), the material of the EPE membrane is EPE (EVA-POE-EVA), and the material of the EP membrane is EP (EVA-POE).

[0068] In this embodiment, the first adhesive film 2 and the second adhesive film 4 include at least one of PVB film, EVA film, EPE film, EP film, and POE film. Furthermore, the material of the first pre-fixed film 33 may be the same as or different from the materials of the first adhesive film 2 and the second adhesive film 4.

[0069] In one embodiment of this utility model, the spacing L1 between adjacent battery cells 31 in the battery string is 0.3 to 0.6 mm. The distance from the edge of the first pre-fixing film 33 to the edge of the battery cell 31 is 0.3 to 0.6 mm, which can achieve good fixation of the first pre-fixing film 33 and help reduce material costs.

[0070] As an embodiment of this utility model, the thickness of the first pre-fixed film 33 is 5 to 150 micrometers, which can not only achieve good fixation of the first pre-fixed film 33, but also maintain the good optical performance of the battery cell 31.

[0071] Example 2

[0072] Please refer to the reference. Figures 3-5 As an embodiment of the present invention, the battery cell 31 includes a first grid line 317 and a second grid line 318 disposed on the first surface 315. The first grid line 317 and the second grid line 318 are disposed at intervals along the first direction Y, and the polarities of the first grid line 317 and the second grid line 318 are opposite.

[0073] The welding strip 32 includes two first welding portions 321 and a connecting portion 320 connecting the two first welding portions 321. One first welding portion 321 is connected to a first grid line 317 on a battery cell 31, and the other first welding portion 321 is connected to a second grid line 318 on another battery cell 31.

[0074] In this embodiment, the solar cell 31 is a back-contact solar cell, and the first surface 315 is the backlight surface of the solar cell 31. The solar cell 31 has grid lines only on the first surface 315. There are multiple first grid lines 317 and second grid lines 318, which are alternately arranged on the first surface 315. Among them, one of the first grid lines 317 and the other of the second grid lines 318 is a positive grid line and the other is a negative grid line.

[0075] In this embodiment, one first welding portion 321 of the solder ribbon 32 is connected to the corresponding first grid line 317 on a battery cell 31, and the other first welding portion 321 of the solder ribbon 32 is connected to the corresponding second grid line 318 on an adjacent battery cell 31, thereby realizing the series connection of adjacent battery cells 31.

[0076] As an embodiment of the present invention, the solder strip 32 is arranged to cross the first gate line 317 and the second gate line 318 and is connected to the first gate line 317 or the second gate line 318.

[0077] In this embodiment, the solder ribbon 32 intersects with the first gate line 317 and the second gate line 318. Specifically, the second direction X is perpendicular to the first direction Y. The first gate line 317 and the second gate line 318 are parallel and spaced apart along the first direction Y, that is, the solder ribbon 32 is perpendicular to the first gate line 317 and the second gate line 318. Of course, in other possible embodiments, the solder ribbon 32 may not be perpendicular to the first gate line 317 and the second gate line 318, as long as the solder ribbon 32 intersects with the first gate line 317 and the second gate line 318.

[0078] like Figure 4 As shown, in this embodiment, an insulating layer 310 is provided between the solder ribbon 32 connected to the first grid line 317 and the second grid line 318 on each battery cell 31, and an insulating layer 310 is also provided between the solder ribbon 32 connected to the second grid line 318 and the first grid line 317 on each battery cell 31, so that the solder ribbon 32 connected to the first grid line 317 on the battery cell 31 and the second grid line 318 on the battery cell 31 maintain good insulation, and the solder ribbon 32 connected to the second grid line 318 on the battery cell 31 and the first grid line 317 on the battery cell 31 maintain good insulation.

[0079] In this embodiment, the solder ribbon 32 is sequentially placed on the first surface 315. The first welding portion 321 of the solder ribbon 32 contacts the corresponding first grid line 317, and the solder ribbon 32 is fixed on the first surface 315 using the first pre-fixing film 33, thereby fixing the solder ribbon 32 and achieving electrical connection between the solder ribbon 32 and the corresponding grid line. Of course, in some other embodiments, the solar cell 31 may not have grid lines, and the solder ribbon 32 can directly contact the doped polycrystalline silicon layer on the solar cell 31 to achieve current collection.

[0080] Example 3

[0081] Please refer to Figures 7-8 As one embodiment of this utility model, each extension portion 330 includes:

[0082] The first extension 3311 is connected to the main body 336. The first extension 3311 is bent relative to the main body 336 toward the plane away from the second surface 316. The first extension 3311 is located on the side of the first surface 315 away from the second surface 316.

[0083] In this embodiment, each extension portion 330 is bent from the edge of the battery cell 31 toward the plane away from the second surface 316 to form a first extension portion 3311. That is, each extension portion 330 is bent from the edge of the battery cell 31 toward the side away from the second surface 316 to form a first extension portion 3311. This can increase the bonding force between the extension portion 330 and the first adhesive film 2 and the second adhesive film 4, and can further improve the fixing effect of the first pre-fixing film 33 on the welding ribbon 32.

[0084] As an embodiment of the present invention, the first extension 3311 includes a connecting surface 3310 connected to the first adhesive film 2. The connecting surface 3310 includes a first end disposed near the battery cell 31 and a second end disposed away from the battery cell 31. The vertical distance from the first end of the connecting surface 3310 to the plane where the second surface 316 is located is less than the vertical distance from the second end of the connecting surface 3310 to the plane where the second surface 316 is located.

[0085] In this embodiment, the vertical distance from the first end of the connecting surface 3310 to the plane where the second surface 316 is located is less than the vertical distance from the second end of the connecting surface 3310 to the plane where the second surface 316 is located, so that the first extension 3311 is inclined relative to the main body 336, which is conducive to the first extension 331 forming a limiting fit with the first adhesive film 2 and the second adhesive film 4, thereby improving the adhesion of the extension 330.

[0086] As one embodiment of the present invention, the vertical distance from the connecting surface 3310 to the plane containing the second surface 316 gradually increases from the first end to the second end.

[0087] In this embodiment, the vertical distance from the connecting surface 3310 to the plane containing the second surface 316 gradually increases from the first end to the second end, which is beneficial to further increase the length of the extension portion 330 and increase the fixing effect between the extension portion 330 and the first adhesive film 2.

[0088] As an embodiment of the present invention, the connecting surface 3310 of the first extension 3311 is an inclined surface or an arc surface.

[0089] In this embodiment, the connecting surface 3310 of the first extension 3311 can be a sloped surface or an arc surface, which facilitates the processing and shaping of the first extension 3311 and ensures the contact area between the first extension 3311 and the second adhesive film 4. The connecting surface 3310 of the first extension 3311 can also be a wavy surface, that is, the connecting surface 3310 of the first extension 3311 is a surface with concave and convex joints, which can increase the surface roughness of the first extension 3311, thereby increasing the bonding force between the first extension 3311 and the first adhesive film 2, and further improving the fixing effect of the first pre-fixed film 33.

[0090] In one embodiment of this utility model, the angle between the connecting surface 3310 of the first extension 3311 and the plane containing the second surface 316 is 10° to 80°. In this embodiment, setting the angle between the connecting surface 3310 of the first extension 3311 and the plane containing the second surface 316 within the range of 10° to 80° improves the fixing effect of the first extension 3311 while preventing excessive bending of the first extension 3311, thus reducing its susceptibility to breakage and enhancing the structural reliability of the first pre-fixed membrane 33. For example, the angle between the connecting surface 3310 of the first extension 3311 and the plane containing the second surface 316 can be any value among 10°, 20°, 30°, 40°, 50°, 60°, 70°, and 80°.

[0091] As one embodiment of this utility model, each extension portion 330 further includes:

[0092] A second extension 3312 is connected to the first extension 3311. The second extension 3312 extends from the first extension 3311 in a direction away from the battery cell 31. The second extension 3312 is connected between the first adhesive film 2 and the second adhesive film 4.

[0093] In this embodiment, the second extension 3312 of each epitaxial portion 330 is connected between the first adhesive film 2 and the second adhesive film 4, which can further increase the bonding area between the epitaxial portion 330 and the first adhesive film 2 and the second adhesive film 4, thereby further improving the fixing effect of the first pre-fixed film 33. The second extension 3312 can be arranged parallel to the second surface 316 of the battery cell 31, or it can be arranged non-parallel to the second surface 316 of the battery cell 31.

[0094] As an embodiment of the present invention, the second extension 3312 and the first extension 3311 are arranged at an angle to each other, that is, the second extension 3312 is not parallel or collinear with the first extension 3311, and the second extension 3312 is bent relative to the first extension 3311, which is beneficial to further increase the bonding force between the extension portion 330 and the adhesive film.

[0095] As an embodiment of this utility model, the thickness of the main body 336 is less than the thickness of the battery cell 31.

[0096] In this embodiment, the first pre-fixing film 33 can be flexibly set according to the thickness of the battery cell 31. The thickness of the first pre-fixing film 33 before lamination is less than the thickness of the battery cell 31. For example, if the thickness of the battery cell 31 is 100-180 micrometers, the thickness of the first pre-fixing film 33 before lamination can be 5-150 micrometers, as long as the thickness of the first pre-fixing film 33 is less than the thickness of the battery cell 31. The thickness of the main body 336 is less than the thickness of the battery cell 31, which facilitates the relative bending of the first pre-fixing film 33 after lamination to form the extension portion 330, thereby increasing the fixing effect of the first pre-fixing film 33 and avoiding the impact of an excessively thick first pre-fixing film 33 on the optical performance of the battery cell 31.

[0097] As one embodiment of the present invention, at least a portion of the extension portion 330 is provided with a cavity structure (not shown).

[0098] The cavity structure can be provided in either the first extension 3311 or the second extension 3312 of the epitaxial portion 330, or both the first extension 3311 and the second extension 3312 can have cavity structures. The cavity structure in the epitaxial portion 330 allows for a stronger bond between the first adhesive film 2 and the second adhesive film 4 and the epitaxial portion 330, significantly increasing the bonding force and improving the fixation effect of the first pre-fixed film 33. Simultaneously, the cavity structure in the epitaxial portion 330 acts as a buffer, reducing stress on the epitaxial portion 330 and preventing breakage. Specifically, the cavity structure can be a hollow cavity or a cavity filled with air.

[0099] As an embodiment of the present invention, the thickness of at least a portion of the first extension 3311 is greater than the thickness of the main body 336.

[0100] In this embodiment, the thickness of the first extension portion 3311 may be greater than that of the main body portion 336 only in a portion of its area, or the thickness of the first extension portion 3311 may be greater than that of the main body portion 336 in all areas. Since the first extension portion 3311 may be at least partially thicker than that of the main body portion 336, the structural strength of the first extension portion 3311 can be further increased, its tensile strength can be improved, and breakage of the first extension portion 3311 can be avoided, which is beneficial to improving the performance of the first pre-fixed film 33. At the same time, the bonding force between the first extension portion 3311 and the first adhesive film 2 and the second adhesive film 4 can be increased, further enhancing the fixing effect of the first pre-fixed film 33.

[0101] Example 4

[0102] Please refer to Figures 7-8 As an embodiment of this utility model, the first pre-fixed film 33 further includes:

[0103] A raised structure 335 is provided on the extension portion 330, and the raised structure 335 is connected to the first adhesive film 2 and / or the second adhesive film 4.

[0104] In this embodiment of the invention, the protrusion structure 335 can be disposed on the surface of the epitaxial portion 330 near the second adhesive film 4 or on the surface of the epitaxial portion 330 near the first adhesive film 2, or it can be disposed on both the surface of the epitaxial portion 330 near the second adhesive film 4 and the surface of the epitaxial portion 330 near the first adhesive film 2. The protrusion direction of the protrusion structure 335 on the epitaxial portion 330 is not limited. The protrusion structure 335 can protrude towards the first adhesive film 2 or the second adhesive film 4, or it can protrude towards the battery cell 31. The protrusion structure 335 can be elongated, and its cross-section can be an arc-shaped protrusion, a serrated protrusion, or other irregularly shaped protrusion.

[0105] As an embodiment of the present invention, a protruding structure 335 is disposed on the surface of the extension portion 330 near the first adhesive film 2, and the protruding structure 335 is embedded in the first adhesive film 2.

[0106] In this embodiment, the protruding structure 335 is embedded in the first adhesive film 2 to form a fit, thereby improving the bonding force between the extension portion 330 and the first adhesive film 2, thereby improving the bonding force between the first pre-fixing film 33 and the first adhesive film 2, and also enhancing the fixing effect of the first pre-fixing film 33 on the welding ribbon 32.

[0107] Specifically, the protrusion structure 335 may include a first protrusion structure 3351 protruding from the first extension portion 331, a second protrusion structure 3352 protruding from the second extension portion 332, a third protrusion structure 3353 protruding from the third extension portion 333, and a fourth protrusion structure 3354 protruding from the fourth extension portion 334. It is understood that the first extension portion 331, the second extension portion 332, the third extension portion 333, and the fourth extension portion 334 may all have protrusion structures 335, or only one of the first extension portion 331, the second extension portion 332, the third extension portion 333, and the fourth extension portion 334 may have a protrusion structure 335. The protrusion structures 335 on each extension portion 330 have the same structure. Of course, in other embodiments, the structures of the protrusion structures 335 on each extension portion 330 may also be different.

[0108] Please refer to Figure 6 In this embodiment, the first pre-fixed film 33 includes a first edge 3301 opposite to the first battery edge 311, a second edge 3302 opposite to the second battery edge 312, a third edge 3303 opposite to the third battery edge 313, and a fourth edge 3304 opposite to the fourth battery edge 314. A first protrusion structure 3351 is located between the first battery edge 311 and the first edge 3301 of the first pre-fixed film 33, a second protrusion structure 3352 is located between the second battery edge 312 and the second edge 3302 of the first pre-fixed film 33, a third protrusion structure 3353 is located between the third battery edge 313 and the third edge 3303 of the first pre-fixed film 33, and a fourth protrusion structure 3354 is located between the fourth battery edge 314 and the fourth edge 3304 of the first pre-fixed film 33. Each epitaxial portion 330 is connected to the first adhesive film 2 and / or the second adhesive film 4 by means of the protrusion structure 335 thereon, which further enhances the bonding force between the first pre-fixed film 33 and the adhesive film and strengthens the fixing effect of the first pre-fixed film 33; moreover, the protrusion structure 335 can reduce the tension of the epitaxial portion 330, improve the buffering effect, and prevent the epitaxial portion 330 from breaking.

[0109] In this embodiment, the outer extension 330 of the first pre-fixed film 33 is connected to the first adhesive film 2 and / or the second adhesive film 4 by means of the protrusion structure 335, which further enhances the bonding force between the outer extension 330 and the adhesive film and strengthens the fixing effect; moreover, the protrusion structure 335 can reduce the tension of the outer extension 330, play a buffering role, and prevent the outer extension 330 from breaking.

[0110] As an embodiment of the present invention, the protrusion structure 335 is disposed on the first extension 3311 or the second extension 3312.

[0111] In this embodiment, when the protruding structure 335 is disposed on the first extension 3311 or the second extension 3312, the protruding structure 335 protrudes relative to the surface of the first extension 3311 or the second extension 3312, which is beneficial to increase the bonding force between the position of the first extension 3311 or the second extension 3312 and the second adhesive film 4.

[0112] As an embodiment of the present invention, the protruding structure 335 is disposed at the connection between the first extension 3311 and the second extension 3312.

[0113] In this embodiment, when the protruding structure 335 is disposed at the connection between the first extension 3311 and the second extension 3312, the protruding structure 335 protrudes from the surface of the connection between the first extension 3311 and the second extension 3312, which helps to increase the bonding force between the connection between the first extension 3311 and the second extension 3312 and the second adhesive film 4. Furthermore, the presence of the protruding structure 335 also helps to increase the buffering effect at the connection between the first extension 3311 and the second extension 3312, preventing breakage at the connection between the first extension 3311 and the second extension 3312. The accompanying drawings of this utility model only illustrate the case where the protruding structure 335 is disposed at the connection between the first extension 3311 and the second extension 3312.

[0114] As an embodiment of this utility model, the distance from the edge of the battery cell 31 to the protrusion structure 335 is less than the distance from the edge of the battery cell 31 to the edge of the corresponding extension portion 330, so that the protrusion structure 335 is located between the edge of the battery cell 31 and the edge of the extension portion 330, which is beneficial to improve the bonding force between the first pre-fixed film 33 and the adhesive film and enhance the fixing effect; moreover, the protrusion structure 335 can reduce the tension of the extension portion 330, improve the buffering effect, and prevent the extension portion 330 from breaking.

[0115] As an embodiment of the present invention, each protrusion structure 335 includes a first side edge 3356 disposed near the battery cell 31 and a second side edge 3357 disposed away from the battery cell 31, wherein the first side edge 3356 and the second side edge 3357 are disposed in a concave-convex manner.

[0116] In this embodiment, the first side edge 3356 and the second side edge 3357 of the protruding structure 335 are in a wave-like shape with concave and convex connections, which can further enhance the bonding force between the protruding structure 335 and the first adhesive film 2 and the second adhesive film 4, and further enhance the fixing effect of the first pre-fixed film 33.

[0117] As an embodiment of the present invention, the length of the first protrusion structure 3351 and the second protrusion structure 3352 along the second direction X is greater than or equal to the length of the battery sheet 31 along the second direction X, thereby further improving the fixing effect of each welding strip 32.

[0118] As an embodiment of the present invention, the protruding structure 335 is disposed on the surface of the extension portion 330 near the first adhesive film 2, and the surface of the protruding structure 335 near the first adhesive film 2 is configured as a wavy surface.

[0119] In this embodiment, the surface of each protrusion 335 near the first adhesive film 2 is set as a wavy surface. The wavy surface can further increase the bonding force between the protrusion 335 and the first adhesive film 2, further improve the fixing effect of the first pre-fixed film 33, and thus improve the fixing effect of the welding ribbon 32.

[0120] Among them, the surfaces of the first protrusion structure 3351, the second protrusion structure 3352, the third protrusion structure 3353 and the fourth protrusion structure 3354 near the first adhesive film 2 are all set with a wavy surface, which further improves the fixing effect of the first pre-fixed film 33.

[0121] As an embodiment of the present invention, the first adhesive film 2 forms a groove that matches the protrusion 335 at the position corresponding to the protrusion 335, and the protrusion 335 is embedded in the groove.

[0122] In this embodiment, the protruding structure 335 is embedded in the groove of the first adhesive film 2, so that the first pre-fixing film 33 and the first adhesive film 2 form a concave-convex mating structure, which can further prevent the pre-fixing film from loosening relative to the second adhesive film 4 and improve the fixing effect between the first pre-fixing film 33 and the first adhesive film 2.

[0123] Example 5

[0124] As an embodiment of the present invention, the extension portion 330 of the first pre-fixed film 33 on two adjacent battery cells 31 of each battery string is connected.

[0125] In this embodiment, the first pre-fixing films 33 on two adjacent battery cells 31 overlap, and the extension portion 330 of the first pre-fixing film 33 on one battery cell is connected to the extension portion 330 of the first pre-fixing film 33 on the adjacent battery cell 31 to form a whole, so that the adjacent first pre-fixing films 33 can also play a mutual fixing role, further improving the fixing effect of the first pre-fixing film 33.

[0126] As an embodiment of the present invention, the distance between two adjacent battery cells 31 in the battery string is L1, the projection length of the first extension 331 in the first direction Y is S1, the projection length of the second extension 332 in the first direction Y is S2, and the sum of S1 and S2 is greater than or equal to L1.

[0127] In this embodiment, within each battery string, the first extension portion 331 and the second extension portion 332 of the first pre-fixed film 33 on two adjacent battery cells 31 are disposed adjacently. When the sum of S1 and S2 is greater than L1, the first extension portion 331 and the second extension portion 332 between two adjacent battery cells 31 overlap and connect to form a single unit, which is beneficial to further improve the fixing effect of the first pre-fixed film 33; such as Figure 8 As shown, when the sum of S1 and S2 equals L1, the first extension portion 331 and the second extension portion 332 of the first pre-fixed film 33 on two adjacent battery cells 31 are connected to form a whole, which can also improve the fixing effect of the first pre-fixed film 33.

[0128] As an embodiment of the present invention, the distance between two adjacent battery cells 31 in each battery string is L1, and the projection length of the first extension portion 331 and the second extension portion 332 of the first pre-fixed film 33 on each battery string along the first direction Y is greater than or equal to L1 / 2.

[0129] In this embodiment, the projection length of the first extension 331 and the second extension 332 of the first pre-fixed film 33 on the battery cell 31 in each battery string is greater than or equal to L1 / 2 along the first direction Y. This facilitates the overlap of the first pre-fixed films 33 on adjacent battery cells 31 in the battery string, which helps to improve the pre-fixing effect of the first pre-fixed film 33 in the battery string, and makes the fixing effect of the solder ribbon 32 in the entire battery string better, thereby improving the connection reliability of the battery string.

[0130] like Figure 9 As shown, in one embodiment of the present invention, the outer extensions 330 of two adjacent first pre-fixed films 33 overlap and connect to form a first overlapping portion 300, and the thickness of the first overlapping portion 300 is greater than the thickness of the main body portion 336.

[0131] In this embodiment, when the sum of S1 and S2 is greater than L1, the first epitaxial portion 331 and the second epitaxial portion 332 between two adjacent battery cells 31 overlap to form a first overlapping portion 300. By controlling the thickness of the first overlapping portion 300 to be greater than the thickness of the main body portion 336, it is beneficial to improve the structural strength of the overlapping position of the adjacent first pre-fixed films 33, so that the adjacent first pre-fixed films 33 are stably connected, which is beneficial to further improve the fixing reliability of the first pre-fixed films 33 and improve the fixing performance of the welding ribbon 32.

[0132] As one embodiment of the present invention, the first overlapping portion 300 is provided with a cavity structure (not shown).

[0133] In this embodiment, the first overlapping portion 300 is provided with a cavity structure, which makes the first overlapping portion 300 have a loose structure. The cavity structure makes the first adhesive film 2 and the second adhesive film 4 more firmly bonded to the first overlapping portion 300, which can greatly increase the bonding force between the first overlapping portion 300 and the first adhesive film 2 and the second adhesive film 4, and improve the fixing effect of the first pre-fixed film 33. At the same time, the cavity structure provided in the first overlapping portion 300 can play a buffering role, which can reduce the stress of the first pre-fixed film 33, avoid the breakage of the first pre-fixed film 33, and make the bonding between adjacent first pre-fixed films 33 more stable.

[0134] Of course, in some other embodiments, the projection length of the first extension portion 331 in the first direction Y is S1, and the projection length of the second extension portion 332 in the first direction Y is S2. The sum of S1 and S2 is less than L1, which can prevent the first extension portion 331 and the second extension portion 332 of the first pre-fixed film 33 of two adjacent battery cells 31 from overlapping, and can reduce the material cost of the first pre-fixed film 33.

[0135] Example 6

[0136] This utility model embodiment also provides a photovoltaic system, which includes the solar cell module of any of the above embodiments. It should be noted that the photovoltaic system has the same or similar beneficial effects as the solar cell module described above, and the related parts between the two can be referred to each other. To avoid repetition, they will not be described again here.

[0137] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple solar photovoltaic modules; for example, multiple solar photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0138] In the description of this specification, references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0139] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A solar cell module, characterized in that, The battery string comprises a first cover plate, a first adhesive film, at least one battery string, a second adhesive film, and a second cover plate, which are stacked sequentially. A plurality of battery cells are spaced apart along a first direction, each battery cell including a first surface and a second surface disposed opposite to each other; A plurality of welding strips are provided, with adjacent battery cells connected by the welding strips. The welding strips extend along a first direction, and the plurality of welding strips are spaced apart along a second direction, which intersects the first direction. Each welding strip includes a first welding portion disposed on the first surface. A plurality of first pre-fixing films are provided, each first pre-fixing film being disposed on a corresponding battery cell. The first pre-fixing film is disposed on the first welding portion and fixedly connected to the first surface. A second adhesive film covers the first pre-fixing film. The first pre-fixing film includes a main body portion covering the first surface and at least one extension portion connected to the main body portion and extending to the outer edge of the battery cell. The extension portion is at least partially bent relative to the main body portion in a direction away from the plane where the second surface is located. The extension portion is connected to the first adhesive film and the second adhesive film.

2. The solar cell module according to claim 1, characterized in that, The battery cell includes a first grid line and a second grid line disposed on the first surface. The first grid line and the second grid line are spaced apart along the first direction, and the polarities of the first grid line and the second grid line are opposite. The welding strip includes two first welding portions and a connecting portion connecting the two first welding portions. One first welding portion is connected to a first grid line on one of the battery cells, and the other first welding portion is connected to a second grid line on another of the battery cells.

3. The solar cell module according to claim 1, characterized in that, Each of the said extensional portions includes: A first extension portion connected to the main body portion is bent relative to the main body portion in a direction away from the plane where the second surface is located, and the first extension portion is located on the side of the first surface away from the second surface.

4. The solar cell module according to claim 3, characterized in that, Each of the said extensional portions further includes: A second extension is connected to the first extension, the second extension extends from the first extension in a direction away from the battery cell, and the second extension is connected between the first adhesive film and the second adhesive film.

5. The solar cell module according to claim 3, characterized in that, The first extension includes a connecting surface connected to the first adhesive film. The connecting surface includes a first end disposed near the battery cell and a second end disposed away from the battery cell. The vertical distance from the first end of the connecting surface to the plane containing the second surface is less than the vertical distance from the second end of the connecting surface to the plane containing the second surface.

6. The solar cell module according to claim 5, characterized in that, The vertical distance from the connecting surface to the plane containing the second surface gradually increases from the first end to the second end.

7. The solar cell module according to claim 5 or 6, characterized in that, The connecting surface of the first extension is an inclined surface or an arc surface.

8. The solar cell module according to claim 1, characterized in that, The first pre-fixed membrane further includes: A raised structure is provided on the extension portion, and the raised structure is connected to the first adhesive film and / or the second adhesive film.

9. The solar cell module according to claim 8, characterized in that, The protruding structure is disposed on the surface of the extension portion near the first adhesive film, and the protruding structure is embedded in the first adhesive film.

10. The solar cell module according to claim 1, characterized in that, The battery cell includes a first battery edge and a second battery edge disposed opposite to each other along the first direction; The extended portion includes a first extended portion and a second extended portion, which are respectively disposed at opposite ends of the main body portion along the first direction. The first extended portion extends from the main body portion to the outer side of the edge of the first battery, and the second extended portion extends from the main body portion to the outer side of the edge of the second battery.

11. The solar cell module according to claim 1 or 10, characterized in that, The battery cell includes a third battery edge and a fourth battery edge disposed opposite to each other along the second direction; the extension portion includes a third extension portion and a fourth extension portion, the third extension portion and the fourth extension portion being respectively connected to opposite ends of the main body portion along the second direction, the third extension portion extending from the main body portion to the outside of the third battery edge, and the fourth extension portion extending from the main body portion to the outside of the fourth battery edge.

12. The solar cell module according to claim 1, characterized in that, The epitaxial portions of two adjacent first pre-fixed films within the battery string are connected.

13. A photovoltaic system, characterized in that, Includes the solar cell module as described in any one of claims 1 to 12.

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