A solar cell module and a photovoltaic system

Abstract

The present invention is applicable to the technical field of solar cell, and provides a solar cell module and a photovoltaic system. The solar cell module includes a first cover plate, a first encapsulant film, a cell string, a second encapsulant film and a second cover plate. The cell string includes: a plurality of solar cells, each solar cell including a first surface and a second surface disposed opposite to each other; a plurality of welding ribbons, adjacent two solar cells being connected by the welding ribbons, the welding ribbon including a first welding portion disposed on the first surface; a plurality of first pre-fixing films, disposed on the first welding portion and fixedly connected to the first surface; the first pre-fixing film including a main body portion and at least one extension portion connected to the main body portion and extending outside the edge of the solar cell, the extension portion being connected to the first encapsulant film and the second encapsulant film, and the extension portions of at least two adjacent first pre-fixing films in the cell string overlapping and connecting in the thickness direction of the solar cell. The solar cell module of the present invention can improve the fixing effect of the pre-fixing film on the welding ribbon and enhance the reliability of the solar cell module.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and in particular, to a solar cell module and a photovoltaic system. Background Art

[0002] A solar cell is a semiconductor device that can convert solar energy into electrical energy. Under light illumination conditions, a photocurrent is generated inside the solar cell, and electrical energy is output through electrodes. In recent years, the production technology of solar cells has been continuously improving, the production cost has been continuously reduced, the conversion efficiency has been continuously increased, and the application of solar cell power generation has become increasingly widespread and has become an important energy source for power supply.

[0003] In the prior art, in order to reduce the paste cost of solar cells, main-grid-free cell wafers have emerged on the market, that is, fine grid lines are printed on the cell wafers. When the cell wafers are assembled into a solar cell module, the fine grid lines of the cell wafers are directly connected by solder tapes. A pre-fixing film is provided on the cell wafer, and the pre-fixing film is heated to melt and bond to the surface of the cell wafer, so as to fix the solder tape on the cell wafer. However, after laminating to form a solar cell module, the pre-fixing film is not provided beyond the edge of the cell wafer, and the pre-fixing films on adjacent cell wafers are independent of each other, and the pre-fixing film is not firmly fixed, so that the solder tape is not firmly fixed, affecting the reliability of the solar cell module. Summary of the Invention

[0004] The present invention provides a solar cell module, aiming to solve the problem in the prior art that the pre-fixing film of the solar cell module is not firmly fixed, resulting in the solder tape not being firmly fixed, and affecting the reliability of the solar cell module.

[0005] The present invention is implemented as follows. A solar cell module is provided, including a first cover plate, a first encapsulant film, at least one battery string, a second encapsulant film, and a second cover plate which are sequentially stacked. The battery string includes:

[0006] A plurality of cell wafers arranged at intervals along a first direction, the cell wafer including a first surface and a second surface arranged opposite to each other;

[0007] A plurality of solder tapes, adjacent two of the cell wafers are connected by the solder tapes, the solder tapes extend along the first direction, the plurality of solder tapes are arranged at intervals along a second direction, the second direction intersects with the first direction, and the solder tape includes a first welding portion disposed on the first surface; and

[0008] A plurality of first pre-fixed films, each of the first pre-fixed films is disposed on a corresponding cell, the first pre-fixed film is disposed on the first welding portion and fixedly connected to the first surface, and the second adhesive film covers the first pre-fixed film; the first pre-fixed film includes a main body portion covering the first surface and at least one extension portion connected to the main body portion and extending outside the edge of the cell, the extension portion is connected to the first adhesive film and the second adhesive film, and the extension portions of at least two adjacent first pre-fixed films in the cell stack are overlapped and connected in the thickness direction of the cell.

[0009] Preferably, the cell includes a first cell edge and a second cell edge oppositely disposed along the first direction;

[0010] The extension portion includes a first extension portion and a second extension portion, the first extension portion and the second extension portion are respectively disposed at opposite ends of the main body portion along the first direction, the first extension portion covers the first cell edge and extends outside the first cell edge, the second extension portion covers the second cell edge and extends outside the second cell edge, and the first extension portion of the first pre-fixed film is overlapped and connected with the second extension portion of the adjacent first pre-fixed film.

[0011] Preferably, the distance between two adjacent cells in the cell stack is L1, the projection length of the first extension portion in the first direction is S1, the projection length of the second extension portion in the first direction is S2, and the sum of S1 and S2 is greater than L1.

[0012] Preferably, both S1 and S2 are greater than L1 / 2, and both S1 and S2 are less than L1.

[0013] Preferably, the extension portions of the first pre-fixed films on two adjacent cells are overlapped and connected to form a first overlapping portion, and the thickness of the first overlapping portion is greater than the thickness of the main body portion.

[0014] Preferably, the projection length of the first overlapping portion in the first direction is less than the distance between two adjacent cells in the cell stack.

[0015] Preferably, the first overlapping portion is provided with a cavity structure.

[0016] Preferably, the battery string includes a first cell located at its first end. The first cell is connected to an edge bus bar, and the distance between the first cell and the edge bus bar is L2. The first extension portion of the first pre - fixing film on the first cell extends towards the edge bus bar, and the projection length of the first extension portion of the first pre - fixing film on the first cell in the first direction is less than L2.

[0017] Preferably, the battery string includes a second cell located at its second end. The second cell is connected to an intermediate bus bar, and the distance between the second cell and the intermediate bus bar is L3. The second extension portion of the first pre - fixing film on the second cell extends towards the intermediate bus bar, and the projection length of the second extension portion of the first pre - fixing film on the second cell in the first direction is less than L3.

[0018] Preferably, the cell includes a third cell edge and a fourth cell 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 are respectively connected to opposite ends of the main body portion along the second direction. The third extension portion covers the third cell edge and extends outside the third cell edge, and the fourth extension portion covers the fourth cell edge and extends outside the fourth cell edge.

[0019] Preferably, the projection lengths of the third extension portion and the fourth extension portion in the second direction are both less than the projection lengths of the first extension portion and the second extension portion in the first direction.

[0020] Preferably, the 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;

[0021] The solder ribbon includes two first welding portions and a connecting portion connecting the two first welding portions. One first welding portion is connected to the first grid line on one cell, and the other first welding portion is connected to the second grid line on the other cell.

[0022] Preferably, the first pre - fixing film includes at least one of a PVB film, an EVA film, an EPE film, an EP film, and a POE film.

[0023] The present invention also provides a photovoltaic system, including the above - mentioned solar cell module.

[0024] A solar cell module provided by the present invention fixes a welding ribbon on a first surface by means of a first pre-fixing film arranged on the first surface of a battery cell. The first pre-fixing film is arranged to include a main body portion and an extension portion connected to the main body portion and extending outside the edge of the battery cell. On the premise that the first pre-fixing film is fixedly connected to the first surface by means of the main body portion, the extension portion is simultaneously connected to a first glue film, so as to increase the fixing area of the first pre-fixing film and make the fixing of the first pre-fixing film more stable. Moreover, since the extension portions of at least two adjacent first pre-fixing films of a battery string are overlapped and connected, the adjacent first pre-fixing films can also play a role in fixing each other, which can further improve the fixing effect of the first pre-fixing film, thereby improving the fixing reliability of the first pre-fixing film for the welding ribbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic plan view of a solar cell module provided by an embodiment of the present invention;

[0026] Figure 2 is a schematic plan view of a battery string of a solar cell module provided by an embodiment of the present invention;

[0027] Figure 3 is a schematic plan view of a partial structure of a solar cell module provided by an embodiment of the present invention;

[0028] Figure 4 is a schematic plan view of a single battery cell of a battery string of a solar cell module provided by an embodiment of the present invention, connecting a welding ribbon;

[0029] Figure 5 is a schematic cross-sectional view of two adjacent battery cells of a battery string of a solar cell module provided by an embodiment of the present invention, connecting a welding ribbon;

[0030] Figure 6 is a schematic cross-sectional view of a solar cell module provided by an embodiment of the present invention along a first direction;

[0031] Figure 7 is a schematic cross-sectional view of another solar cell module provided by an embodiment of the present invention along the first direction;

[0032] Figure 8 is a schematic cross-sectional view of another solar cell module provided by an embodiment of the present invention along the first direction, at another cross-section;

[0033] Figure 9 is a schematic cross-sectional view of a solar cell module provided by an embodiment of the present invention along a second direction;

[0034] Figure 10 is a schematic plan view of a battery cell of a solar cell module provided by an embodiment of the present invention, after covering the first pre-fixing film;

[0035] Figure 11 Schematic cross-sectional view of the first solar cell module provided by an embodiment of the present invention;

[0036] Figure 12 Schematic cross-sectional view of the second solar cell module provided by an embodiment of the present invention;

[0037] Figure 13 Schematic cross-sectional view of the third solar cell module provided by an embodiment of the present invention;

[0038] Figure 14 Schematic cross-sectional view of the fourth solar cell module provided by an embodiment of the present invention;

[0039] Figure 15 Schematic plan view of the connection solder tape of a single cell of another solar cell module provided by an embodiment of the present invention;

[0040] Figure 16 Another schematic plan view of the connection solder tape of a single cell of another solar cell module provided by an embodiment of the present invention;

[0041] Figure 17 Schematic cross-sectional view of the connection solder tape between adjacent cells of another solar cell module provided by an embodiment of the present invention;

[0042] Figure 18 Schematic cross-sectional view of another solar cell module provided by an embodiment of the present invention;

[0043] Figure 19 Schematic cross-sectional view of another solar cell module along the first direction provided by an embodiment of the present invention;

[0044] Figure 20 Schematic cross-sectional view of yet another solar cell module provided by an embodiment of the present invention;

[0045] Figure 21 Schematic cross-sectional view of yet another solar cell module along the first direction provided by an embodiment of the present invention;

[0046] Figure 22 Another schematic plan view of a solar cell module provided by an embodiment of the present invention. Detailed implementation manners

[0047] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "back", "front", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0049] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0050] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use scenarios of other materials.

[0051] An embodiment of the present invention provides a solar cell module. By providing a first pre-fixing film on the first surface of the cell, the welding tape is fixed on the first surface by using the first pre-fixing film. The first pre-fixing film is configured to include a main body portion and an extension portion connected to the main body portion and extending outside the edge of the cell. On the premise that the first pre-fixing film is fixedly connected to the first surface by using the main body portion, the extension portion is simultaneously connected to the first encapsulant film, making the fixation of the first pre-fixing film more stable. Moreover, since the extension portions of at least two adjacent first pre-fixing films in the battery string intersect and are connected, the adjacent first pre-fixing films are mutually fixed through the connection, which can further improve the fixing effect of the first pre-fixing film, thereby enhancing the fixing reliability of the first pre-fixing film for the welding tape.

[0052] Embodiment 1

[0053] Please refer to Figures 1 - 8 , an embodiment of the present invention provides a solar cell module, including a first cover plate 1, a first encapsulant film 2, at least one battery string, a second encapsulant film 4, and a second cover plate 5 that are sequentially stacked. The battery string includes:

[0054] A plurality of cell pieces 31 sequentially arranged at intervals along the first direction Y. The cell pieces 31 include a first surface 315 and a second surface 316 that are oppositely arranged;

[0055] A plurality of welding tapes 32. Adjacent two cell pieces 31 are connected by the welding tapes 32. The welding tapes 32 extend along the first direction Y. The plurality of welding tapes 32 are arranged at intervals along the second direction X. The second direction X intersects the first direction Y. The welding tapes 32 include a first welding portion 321 provided on the first surface 315; and

[0056] A plurality of first pre-fixing films 33. Each first pre-fixing film 33 is disposed on the corresponding cell piece 31. The first pre-fixing film 33 is disposed on the first welding portion 321 and fixedly connected to the first surface 315. The second encapsulant film 4 covers the first pre-fixing film 33. The first pre-fixing film 33 includes a main body portion 336 covering the first surface 315 and at least one extension portion 330 connected to the main body portion 336 and extending outside the edge of the cell piece 31. The extension portion 330 is connected to the first encapsulant film 2 and the second encapsulant film 4. At least two adjacent first pre-fixing films 33 in each battery string have their extension portions 330 overlapping and connected.

[0057] In an embodiment of the present invention, the solar cell module includes at least one battery string. When the solar cell module includes multiple battery strings, the multiple battery strings can be arranged in multiple rows and columns. The solar cells 31 within each battery string are connected in series through welding tapes 32. Different battery strings can be connected in series or in parallel through busbars to achieve the current collection and output. The multiple battery strings can form a solar cell array and are encapsulated together with a first cover plate 1, a first encapsulant film 2, a second encapsulant film 4, and a second cover plate 5 to form a solar cell module.

[0058] As Figure 1 shown, as an embodiment of the present invention, the solar cell module includes at least one battery string unit 30, and each battery string unit 30 includes:

[0059] A first battery string 301 and a second battery string 302 spaced apart along the second direction X;

[0060] A third battery string 303 and a fourth battery string 304 spaced apart along the second direction X, the first battery string 301 and the third battery string 303 are arranged along the first direction Y, and the second battery string 302 and the fourth battery string 304 are arranged along the first direction Y.

[0061] Wherein, 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 an 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 an adjacent battery string unit 30.

[0062] Specifically, one end of the first battery string 301 and the second battery string 302 of each battery string unit 30 is connected in series through an edge busbar 306, the third battery string 303 and the fourth battery string 304 are also connected in series through an edge busbar 306, the first battery string 301 and the third battery string 303 are connected in parallel through an intermediate busbar 308, the second battery string 302 and the fourth battery string 304 are connected in parallel through an intermediate busbar 308, the second battery string 302 of the battery string unit 30 is connected in series with the first battery string 301 of an adjacent battery string unit 30 through an intermediate busbar 308, and the fourth battery string 304 of each battery string unit 30 is connected in series with the third battery string 303 of an adjacent battery string unit 30 through an intermediate busbar 308. Of course, other connection methods can also be used to achieve the series and parallel connections between the battery strings.

[0063] Wherein, Figure 1Only three battery string units 30 are schematically shown. The battery string units 30 are arranged at intervals in sequence along the second direction X. Each battery string unit 30 includes the above-mentioned first battery string 301, second battery string 302, third battery string 303, and fourth battery string 304.

[0064] In an embodiment of the present invention, a provided solar cell module fixes a welding tape 32 on a first surface 315 by arranging a first pre-fixing film 33 on the first surface 315 of a battery chip 31 of a battery string, and the welding tape 32 does not need to be fixed on the first surface 315 by a welding process; meanwhile, the first pre-fixing film 33 is arranged to include a main body portion 336 and an extension portion 330 connected to and extending outside the battery chip 31 of the main body portion 336. On the premise that the first pre-fixing film 33 is fixedly connected to the first surface 315 by the main body portion 336, the extension portion 330 is simultaneously connected to the first adhesive film 2, so that the first pre-fixing film 33 is fixed more firmly, thereby improving the fixing effect of the first pre-fixing film 33 on the welding tape 32, and the connection between the extension portion 330 and the first adhesive film 2 can improve the pre-fixing effect of the first pre-fixing film 33 on the welding tape 32 before lamination.

[0065] Meanwhile, since the extension portions 330 of at least two adjacent first pre-fixing films 33 in the battery string are overlapped and connected, the extension portion 330 of the first pre-fixing film 33 on one battery chip 31 is overlapped and connected with the extension portion 330 of the first pre-fixing film 33 on the adjacent battery chip 31, so that the adjacent first pre-fixing films 33 can also play a role of mutual fixation, and the adjacent first pre-fixing films 33 are overlapped and connected, which can enhance the structural strength at the connection of the adjacent first pre-fixing films 33, further prevent the first pre-fixing film 33 from moving, improve the fixing effect of the first pre-fixing film 33, and thus improve the fixing reliability of the first pre-fixing film 33 on the welding tape 32. Optionally, the extension portions 330 of any two adjacent first pre-fixing films 33 in each battery string are overlapped and connected, which can improve the fixing effect of each first pre-fixing film 33.

[0066] As an embodiment of the present invention, the extension portion 330 is bent relative to the main body portion 336 in a direction close to the plane where the second surface 316 is located. A part of the extension portion 330 is located on the side of the plane where the first surface 315 is located away from the second surface 316, and a part of the extension portion 330 is located on the side of the plane where the first surface 315 is located close to the second surface 316. The extension portion 330 is non-parallel to the first surface 315. The bent extension portion 330 and the battery cell 31 form a limiting and matching structure, which can well prevent the first pre-fixing film 33 from loosening and shifting, so that the first pre-fixing film 33 is stably fixed on the battery cell 31. At the same time, the extension portion 330 and the first adhesive film 2 and the second adhesive film 4 also form a limiting and matching structure, which is beneficial to increasing the bonding force between the extension portion 330 and the first adhesive film 2 and the second adhesive film 4, and can well prevent the first pre-fixing film 33 from loosening, greatly improving the fixing reliability of the first pre-fixing film 33 to the welding tape 32.

[0067] In some other embodiments, the extension portion 330 can also be bent relative to the main body portion 336 in a direction away from the plane where the second surface 316 is located. The extension portion 330 is all located on the side of the plane where the first surface 315 is located away from the second surface 316. The extension portion 330 can also form a limiting and matching structure with the first adhesive film 2 and the second adhesive film 4, which is beneficial to increasing the bonding force between the extension portion 330 and the first adhesive film 2 and the second adhesive film 4, and also improving the fixing reliability of the first pre-fixing film 33 to the welding tape 32.

[0068] In the embodiment of the present invention, one of the first surface 315 and the second surface 316 of the battery cell 31 is a light-facing surface, and the other is a backlight-facing surface. The battery cell 31 can be a back-contact solar cell or a double-sided contact solar cell. Specifically, in the case where the battery cell 31 is a back-contact solar cell, only the first surface 315 of the battery cell 31 has grid lines. For example, the battery cell 31 can be an IBC solar cell or an HBC solar cell. In the case where the battery cell 31 is a double-sided contact cell, both the first surface 315 and the second surface 316 of the battery cell 31 have grid lines. For example, the battery cell 31 can be a Topcon solar cell.

[0069] In the embodiment of the present invention, 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 is glass and the other is a back plate, that is, the solar cell module can be a single-glass module.

[0070] In the embodiment of the present invention, each battery string includes a plurality of welding tapes 32, and the specific number of the welding tapes 32 in each battery string is not limited, and the specific number of the welding tapes 32 can be flexibly set according to actual applications. Specifically, each welding tape 32 extends along the first direction Y, that is, the length direction of the welding tape 32 is the first direction Y, and the welding tapes 32 are sequentially arranged at intervals along the second direction X.

[0071] In an embodiment of the present invention, the main body portion 336 completely covers the first surface 315, that is, the size of the main body portion 336 is the same as the size of the battery cell 31, so that the first welding portion 321 of the welding tape 32 is fixed on the first surface 315 of the battery cell 31.

[0072] In an embodiment of the present invention, the number of the first pre-fixing films 33 is adapted to the number of the battery cells 31, and one first pre-fixing film 33 is correspondingly arranged on each battery cell 31, which is convenient for fixing the welding tape 32 on each battery cell 31. Moreover, compared with laying a whole pre-fixing film on the entire battery string, in this embodiment, one first pre-fixing film 33 is correspondingly arranged on each battery cell 31. When the first pre-fixing film 33 is adsorbed and laid on the battery cell 31, during this process, the first pre-fixing film 33 is not easily bent and deformed, which is more convenient for the adsorption and laying of the first pre-fixing film 33, and is convenient for performing the film covering process of the first pre-fixing film 33, and can reduce the production and processing difficulty of the solar cell module. Each first pre-fixing film 33 forms an extension portion 330 at at least one battery edge of the battery cell 31, or an extension portion 330 can also be formed at each battery edge of the battery cell 31. Wherein, the extension portion 330 is specifically the part of the first pre-fixing film 33 that extends beyond the edge of the battery cell 31.

[0073] Please refer to Figures 4 - 10 , in an embodiment of the present invention, the battery cell 31 includes a first battery edge 311 and a second battery edge 312 that are oppositely arranged along the first direction Y, and a third battery edge 313 and a fourth battery edge 314 that are oppositely arranged along the second direction X.

[0074] Wherein, the extension portion 330 may include a first extension portion 331 connected to the main body portion 336 and extending along the first direction Y to the outside of the first battery edge 311, a second extension portion 332 connected to the main body portion 336 and extending along the first direction Y to the outside of the second battery edge 312, a third extension portion 333 connected to the main body portion 336 and extending along the second direction X to the outside of the third battery edge 313, and a fourth extension portion 334 connected to the main body portion 336 and extending along the second direction X to the outside of the fourth battery edge 314. Wherein, the extension portion 330 includes at least one of the first extension portion 331, the second extension portion 332, the third extension portion 333, and the fourth extension portion 334.

[0075] Please refer to Figure 4 and Figure 10 , as an embodiment of the present invention, the battery cell 31 includes a first battery edge 311 and a second battery edge 312 that are oppositely arranged along the first direction Y;

[0076] The outer extension part 330 includes a first outer extension part 331 and a second outer extension part 332. The first outer extension part 331 and the second outer extension part 332 are respectively arranged at opposite ends of the main body part 336 along the first direction Y. The first outer extension part 331 covers the first battery edge 311 and extends to the outside of the first battery edge 311. The second outer extension part 332 covers the second battery edge 312 and extends to the outside of the second battery edge 312. The first outer extension part 331 of the first pre-fixing film 33 overlaps and connects with the second outer extension part 332 of the adjacent first pre-fixing film 33.

[0077] In this embodiment, the welding strip 32 extends along the first direction Y. At least a part of the welding strips 32 extend to the outside of the first battery edge 311, and at least a part of the welding strips 32 extend along the first direction Y to the outside of the second battery edge 312. The first outer extension part 331 wraps around the position of the first battery edge 311 of the welding strip 32, making it difficult for the welding strip 32 to shift in position at the first battery edge 311. At the same time, the second outer extension part 332 wraps around the position of the second battery edge 312 of the welding strip 32, making it difficult for the welding strip 32 to shift in position at the second battery edge 312. This can greatly improve the fixing stability of the welding strip 32 at the positions of the first battery edge 311 and the second battery edge 312, and further improve the structural reliability of the solar cell module. Moreover, at least a part of the area where the welding strip 32 extends beyond the first battery edge 311 is covered and fixed by the first outer extension part 331, and at least a part of the area where the welding strip 32 extends beyond the second battery edge 312 is covered and fixed by the second outer extension part 332, preventing the welding strip 32 from loosening at the positions of the first battery edge 311 and the second battery edge 312, thereby improving the fixing effect of the welding strip 32 at the positions of the first battery edge 311 and the second battery edge 312. The first outer extension part 331 of the first pre-fixing film 33 overlaps and connects with the second outer extension part 332 of the adjacent first pre-fixing film 33. The adjacent first pre-fixing films 33 are connected to each other to play a role of mutual fixation, which can further improve the fixing effect of the first pre-fixing film 33 and the fixing reliability of the first pre-fixing film 33 on the welding strip 32.

[0078] As an embodiment of the present invention, the battery chip 31 further includes a third battery edge 313 and a fourth battery edge 314 that are oppositely arranged along the second direction X. The outer extension part 330 includes a third outer extension part 333 and a fourth outer extension part 334. The third outer extension part 333 and the fourth outer extension part 334 are respectively connected to opposite ends of the main body part 336 along the second direction X. The third outer extension part 333 covers the third battery edge 313 and extends to the outside of the third battery edge 313. The fourth outer extension part 334 covers the fourth battery edge 314 and extends to the outside of the fourth battery edge 314.

[0079] In this embodiment, the first pre-fixing film 33 is connected to the first adhesive film 2 and the second adhesive film 4 by using a third epitaxial portion 333 and a fourth epitaxial portion 334 distributed along the second direction X respectively. The bent third epitaxial portion 333 and the fourth epitaxial portion 334 form a limiting and matching structure with the battery cell 31, and at the same time, the first pre-fixing film 33 is limited and fixed in the first direction Y and the second direction X, which can further improve the fixing effect of the first pre-fixing film 33, further improve the fixing stability of the welding strip 32, and improve the reliability of the solar cell module.

[0080] Among them, the structures of the epitaxial portions 330 are the same, that is, the structures of the first epitaxial portion 331, the second epitaxial portion 332, the third epitaxial portion 333 and the fourth epitaxial portion 334 are the same; of course, in some possible embodiments, the structures of the epitaxial portions 330 may also be different.

[0081] As an embodiment of the present invention, the projection lengths of the third epitaxial portion 333 and the fourth epitaxial portion 334 along the second direction X are both smaller than the projection lengths of the first epitaxial portion 331 and the second epitaxial portion 332 along the first direction Y.

[0082] In this embodiment, it can be understood that the projection length of the third epitaxial portion 333 along the second direction X is smaller than the projection length of the first epitaxial portion 331 along the first direction Y, and the projection length of the third epitaxial portion 333 along the second direction X is smaller than the projection length of the second epitaxial portion 332 along the first direction Y; the projection length of the fourth epitaxial portion 334 along the second direction X is smaller than the projection length of the first epitaxial portion 331 along the first direction Y, and the projection length of the fourth epitaxial portion 334 along the second direction X is smaller than the projection length of the second epitaxial portion 332 along the first direction Y. Among them, the projection lengths of the third epitaxial portion 333 and the fourth epitaxial portion 334 along the second direction X may be equal, the projection lengths of the first epitaxial portion 331 and the second epitaxial portion 332 along the first direction Y may be equal, and the projection lengths of the third epitaxial portion 333 and the fourth epitaxial portion 334 along the second direction X are both smaller than the projection lengths of the first epitaxial portion 331 and the second epitaxial portion 332 along the first direction Y, which can reduce the size design of the first pre-fixing film 33 in the second direction X, avoid the overlapping of the first pre-fixing films 33 on the adjacent battery strings distributed along the second direction X, and is beneficial to reducing the material consumption of the first pre-fixing film 33.

[0083] As an embodiment of the present invention, the first pre-fixing film 33 includes at least one of a PVB film, an EVA film, an EPE film, an EP film and a POE film.

[0084] Among them, the material of the first pre-fixing film 33 can be one of PVB film, EVA film, EPE film, EP film, and POE film, or it can be a laminate of at least two of PVB film, EVA film, EPE film, EP film, and POE film. The material of the PVB film is polyvinyl butyral (PVB), the material of the EVA film is ethylene-vinyl acetate copolymer (EVA), the material of the POE film is polyolefin elastomer (POE), the material of the EPE film is EPE (EVA-POE-EVA), and the material of the EP film is EP (EVA-POE).

[0085] 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. In addition, the material of the first pre-fixing film 33 may be the same as or different from the materials of the first adhesive film 2 and the second adhesive film 4.

[0086] As an embodiment of the present invention, the spacing L1 between adjacent solar cells 31 of 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 solar cell 31 is 0.3 to 0.6 mm, which can not only achieve good fixation of the first pre-fixing film 33 but also help reduce the material cost.

[0087] As an embodiment of the present invention, the thickness of the first pre-fixing film 33 is 5 to 150 microns, which can not only achieve good fixation of the first pre-fixing film 33 but also maintain good optical performance of the solar cell 31.

[0088] Embodiment Two

[0089] Please refer to Figures 3 - 5 , as an embodiment of the present invention, the solar 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 spaced apart along the first direction Y, and the polarities of the first grid line 317 and the second grid line 318 are opposite;

[0090] The welding ribbon 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 the first grid line 317 on one solar cell 31, and the other first welding portion 321 is connected to the second grid line 318 on the other solar cell 31.

[0091] In this embodiment, the solar cell 31 is a back-contact solar cell, the first surface 315 is the backlight surface of the solar cell 31, and the solar cell 31 has grid lines only on the first surface 315. The numbers of the first grid line 317 and the second grid line 318 are both multiple, and the first grid line 317 and the second grid line 318 are alternately arranged on the first surface 315. Among them, one of the first grid line 317 and the second grid line 318 is a positive grid line, and the other is a negative grid line.

[0092] In this embodiment, one first welding portion 321 of the welding strip 32 is connected to the corresponding first grid line 317 on one solar cell 31, and the other first welding portion 321 of the welding strip 32 is connected to the corresponding second grid line 318 on the adjacent solar cell 31, so as to realize the series connection of the adjacent solar cells 31.

[0093] As an embodiment of the present invention, the welding strip 32 is arranged to cross the first grid line 317 and the second grid line 318 and is connected to the first grid line 317 or the second grid line 318.

[0094] In this embodiment, the welding strip 32 intersects with the first grid line 317 and the second grid line 318. Specifically, the second direction X is perpendicular to the first direction Y. The first grid line 317 and the second grid line 318 are arranged in parallel at intervals along the first direction Y, that is, the welding strip 32 is arranged perpendicular to the first grid line 317 and the second grid line 318. Of course, in other possible embodiments, the welding strip 32 may not be perpendicular to the first grid line 317 and the second grid line 318, as long as it is ensured that the welding strip 32 intersects with the first grid line 317 and the second grid line 318.

[0095] As Figure 4 shown, in this embodiment, an insulating layer 310 is arranged between the welding strip 32 connected to the first grid line 317 and the second grid line 318 on each solar cell 31, and an insulating layer 310 is also arranged between the welding strip 32 connected to the second grid line 318 and the first grid line 317 on each solar cell 31, so as to keep good insulation between the welding strip 32 connected to the first grid line 317 and the second grid line 318 on the solar cell 31, and keep good insulation between the welding strip 32 connected to the second grid line 318 and the first grid line 317 on the solar cell 31.

[0096] In this embodiment, the welding strip 32 is sequentially placed on the first surface 315. The first welding portion 321 of the welding strip 32 contacts the corresponding first grid line 317, and the welding strip 32 is fixed on the first surface 315 by using the first pre-fixing film 33, so as to realize the fixation of the welding strip 32 and realize the electrical connection between the welding strip 32 and the corresponding grid line.

[0097] Embodiment III

[0098] Please refer to Figure 3 and Figure 6 , as an embodiment of the present invention, the extension portions 330 of the adjacent two first pre-fixing films 33 are overlapped and connected in the thickness direction of the solar cell 31.

[0099] In this embodiment, within each battery string, the first extension part 331 and the second extension part 332 of the first pre-fixing film 33 on two adjacent solar cells 31 are arranged adjacent to each other. The first extension part 331 and the second extension part 332 between two adjacent solar cells 31 are overlapped and connected integrally along the thickness direction of the solar cell 31, which can increase the thickness of the overlapping area of the first pre-fixing film 33 and is beneficial to further improving the fixing effect of the first pre-fixing film 33.

[0100] As an embodiment of the present invention, the distance between two adjacent solar cells 31 in the battery string is L1, the projection length of the first extension part 331 along the first direction Y is S1, the projection length of the second extension part 332 along the first direction Y is S2, and the sum of S1 and S2 is greater than L1.

[0101] In this embodiment, when the sum of S1 and S2 is greater than L1, the first extension part 331 and the second extension part 332 between two adjacent solar cells 31 are overlapped and connected integrally, which is beneficial to further improving the fixing effect of the first pre-fixing film 33.

[0102] As an embodiment of the present invention, both S1 and S2 are greater than L1 / 2 and both S1 and S2 are less than L1.

[0103] In this embodiment, controlling both S1 and S2 to be greater than L1 / 2 can ensure the overlapping area of the first extension part 331 and the second extension part 332 and improve the fixing effect of the first pre-fixing film 33. At the same time, controlling both S1 and S2 to be less than L1 can prevent the extension part 330 of the first pre-fixing film 33 from extending onto adjacent solar cells 31 and maintain the good optical performance of the solar cells 31.

[0104] As an embodiment of the present invention, the extension parts 330 of the first pre-fixing film 33 on two adjacent solar cells 31 are overlapped and connected to form a first overlapping part 300, and the thickness D1 of the first overlapping part 300 is greater than the thickness D2 of the main body part 336.

[0105] In this embodiment, when the sum of S1 and S2 is greater than L1, the first extension part 331 and the second extension part 332 between two adjacent solar cells 31 are overlapped to form a first overlapping part 300. By controlling the thickness of the first overlapping part 300 to be greater than the thickness of the main body part 336, it is beneficial to improve the structural strength of the overlapping position of adjacent first pre-fixing films 33, make the adjacent first pre-fixing films 33 stably connected, and is beneficial to further improving the fixing reliability of the first pre-fixing film 33 and the fixing performance of the welding strip 32.

[0106] As an embodiment of the present invention, the projection length of the first overlapping part 300 in the first direction Y is less than the distance L1 between two adjacent solar cells 31 in the battery string.

[0107] In this embodiment, the projection length of the first overlapping portion 300 in the first direction Y is less than the spacing L1 between two adjacent solar cells 31 in the solar cell string, so as to prevent the extended portion 330 of the first pre-fixing film 33 from extending onto adjacent solar cells 31 and maintain good optical performance of the solar cells 31.

[0108] As an embodiment of the present invention, the first overlapping portion 300 is provided with a cavity structure (not shown).

[0109] In this embodiment, the first overlapping portion 300 is provided with at least one cavity structure, preferably, the first overlapping portion 300 is provided with a plurality of cavity structures, so that the first overlapping portion 300 has a loose structure. The cavity structures enable the first adhesive film 2 and the second adhesive film 4 to be more firmly combined with 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-fixing film 33. At the same time, the cavity structures provided in the first overlapping portion 300 can play a buffering role, reduce the stress of the first pre-fixing film 33, prevent the first pre-fixing film 33 from breaking, and make the combination between adjacent first pre-fixing films 33 more stable. Wherein, the cavity structure can specifically be a hollow cavity or a cavity filled with air.

[0110] Embodiment Four

[0111] Please refer to Figure 7 , as another embodiment of the present invention, the extended portions 330 of two adjacent first pre-fixing films 33 are connected in contact with each other in the first direction Y.

[0112] In this embodiment, within each solar cell string, the first extended portion 331 and the second extended portion 332 of the first pre-fixing films 33 on two adjacent solar cells 31 are arranged adjacent to each other. The end of the first extended portion 331 of the first pre-fixing film 33 on one solar cell 31 is just in contact and connected integrally with the end of the second extended portion 332 of the first pre-fixing film 33 on another solar cell 31 in the first direction Y, which can also improve the fixing effect of the first pre-fixing film 33.

[0113] As an embodiment of the present invention, the spacing between two adjacent solar cells 31 in the solar cell string is L1, the projection length of the first extended portion 331 in the first direction Y is S1, the projection length of the second extended portion 332 in the first direction Y is S2, and the sum of S1 and S2 is equal to L1.

[0114] In this embodiment, 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 equal to L1, which can ensure that the ends of the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 on two adjacent solar cells 31 just come into contact and are connected into one body, which can improve the fixing effect of the first pre-fixing film 33. Moreover, compared with the case where the first extension portion 331 and the second extension portion 332 overlap, it is beneficial to reduce the material consumption of the first pre-fixing film 33.

[0115] As an embodiment of the present invention, both S1 and S2 are equal to L1 / 2, and the sum of S1 and S2 is equal to L1, which can ensure that the ends of the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 on two adjacent solar cells 31 just come into contact and are connected into one body, which can improve the fixing effect of the first pre-fixing film 33.

[0116] As an embodiment of the present invention, one of S1 and S2 is greater than L1 / 2, and the other is less than L1 / 2. The sum of S1 and S2 is equal to L1, which can also ensure that the ends of the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 on two adjacent solar cells 31 just come into contact and are connected into one body, which can improve the fixing effect of the first pre-fixing film 33.

[0117] Embodiment Five

[0118] Please refer to Figures 10 - 11 , as an embodiment of the present invention, the extension portion 330 includes:

[0119] a first extension portion 3311 connected to the main body portion 336. The first extension portion 3311 is bent relative to the main body portion 336 toward the plane of the second surface 316. A part of the first extension portion 3311 is located on the side of the plane of the first surface 315 away from the second surface 316, and a part of the first extension portion 3311 is located on the side of the plane of the first surface 315 close to the second surface 316.

[0120] In this embodiment, each extension portion 330 is bent from the edge of the battery cell 31 towards the plane where the second surface 316 is located to form a first extension portion 3311. The first extension portion 3311 is used to cover the edge position of the battery cell 31. The first part of the first extension portion 3311 is located on the side of the plane where the first surface 315 is located away from the second surface 316, and the second part of the first extension portion 3311 is located on the side of the plane where the first surface 315 is located close to the second surface 316. That is, part of the first extension portion 3311 is located above the plane where the first surface 315 is located, and part of the first extension portion 3311 is located below the plane where the first surface 315 is located. The first extension portion 3311 can better restrict the movement of the first pre-fixing film 33, and 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 tape 32.

[0121] Please refer to Figure 11 , as an embodiment of the present invention, the first extension portion 3311 includes an upper surface 3310 arranged away from the second surface 316. The upper surface 3310 includes a first end close to the battery cell 31 and a second end away from the battery cell 31. The vertical distance from the first end of the upper surface 3310 to the plane where the second surface 316 is located is greater than the vertical distance from the second end of the upper surface 3310 to the plane where the second surface 316 is located.

[0122] In this embodiment, since the first extension portion 3311 is bent from the first battery edge 311 towards the plane where the second surface 316 is located, and the vertical distance from the first end of the upper surface 3310 to the plane where the second surface 316 is located is greater than the vertical distance from the second end of the upper surface 3310 to the plane where the second surface 316 is located, the upper surface 3310 of the first extension portion 3311 and the main body portion 336 are located in different planes, and the first extension portion 3311 is inclined relative to the second surface 316, which is beneficial to increasing the total length design of the extension portion 330, thereby increasing the bonding area between the extension portion 330 and the first adhesive film 2 and the second adhesive film 4, and improving the adhesion of the extension portion 330.

[0123] As an embodiment of the present invention, the vertical distance from the upper surface 3310 to the plane where the second surface 316 is located gradually decreases from the first end to the second end direction.

[0124] In this embodiment, in the direction from the first end to the second end, the vertical distance from the upper surface 3310 to the plane where the second surface 316 is located gradually decreases from the first end to the second end direction, which is beneficial to increasing the length of the extension portion 330 and increasing the fixing effect of the extension portion 330 on the first adhesive film 2 and the second adhesive film 4.

[0125] As an embodiment of the present invention, the upper surface 3310 of the first extension portion 3311 is an inclined surface or a curved surface.

[0126] In this embodiment, the upper surface 3310 of the first extension portion 3311 may be an inclined surface or an arc surface, which is convenient for the processing and forming of the first extension portion 3311 and can ensure the contact area between the first extension portion 3311 and the second adhesive film 4. The upper surface 3310 of the first extension portion 3311 may also be a wavy surface, that is, the upper surface 3310 of the first extension portion 3311 is a surface with concave and convex connections, which can increase the surface roughness of the first extension portion 3311, and thus can increase the bonding force between the first extension portion 3311 and the second adhesive film 4, further improving the fixing effect of the first pre-fixing film 33.

[0127] As an embodiment of the present invention, the angle C between the upper surface 3310 of the first extension portion 3311 and the plane of the second surface 316 is 10° to 80°. In this embodiment, the angle C between the upper surface 3310 of the first extension portion 3311 and the plane of the second surface 316 is set within the range of 10° to 80°, which can not only improve the fixing effect of the first extension portion 3311, but also avoid too large a bending angle of the first extension portion 3311, making the first extension portion 3311 not easily broken and improving the structural reliability of the first pre-fixing film 33. For example, the angle C between the upper surface 3310 of the first extension portion 3311 and the plane of the second surface 316 can be any value among 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°.

[0128] As another embodiment of the present invention, the upper surface 3310 of the first extension portion 3311 may also be a non-inclined surface, and the angle between the connection line between the first end and the second end of the upper surface 3310 and the plane of the second surface 316 is set to 10° to 80 degrees, which can also increase the fixing effect of the first pre-fixing film 33, ensure the good fixing performance of the first pre-fixing film 33, and make the extension portion 330 not easily break, ensuring the good structural strength of the first pre-fixing film 33.

[0129] Please refer to Figures 12 - 14 , as an embodiment of the present invention, the battery cell 31 includes a plurality of side surfaces connecting the first surface 315 and the second surface 316, and the extension portion 330 wraps at least a partial area of at least one side surface, which can increase the adhesion between the first pre-fixing film 33 and the battery cell 31, make the fixing of the first pre-fixing film 33 more stable, and prevent the position deviation of the welding tape 32.

[0130] As an embodiment of the present invention, the side surface includes a first side surface 3191 connecting the first surface 315 and the second surface 316 and located on the side where the first battery edge 311 is located, and the first extension portion 331 wraps at least a partial area of the first side surface 3191 of the battery cell 31.

[0131] In this embodiment, the first extension portion 331 of the first pre-fixing film 33 wraps at least a partial area of the first side surface 3191 of the battery cell 31, and the second extension portion 332 of the first pre-fixing film 33 wraps at least a partial area of the second side surface 3192 of the battery cell 31, which can increase the adhesion of the first pre-fixing film 33, make the fixation of the first pre-fixing film 33 more stable, and prevent the position deviation of the welding tape 32.

[0132] As an embodiment of the present invention, the battery cell 31 includes a second side surface 3192 that connects the first surface 315 and the second surface 316 and is located on the side where the second battery edge 312 is located. The second extension portion 332 wraps at least a partial area of the second side surface 3192 of the battery cell 31 to further increase the adhesion between the first pre-fixing film 33 and the battery cell 31 and improve the fixing effect of the first pre-fixing film 33.

[0133] In addition, the side surface further includes a third side surface that connects the first surface 315 and the second surface 316 and is located on the side where the third battery edge 313 is located, and a fourth side surface that connects the first surface 315 and the second surface 316 and is located on the side where the fourth battery edge 314 is located. The third extension portion 333 can wrap at least a partial area of the third side surface of the battery cell 31, and the fourth extension portion 334 wraps at least a partial area of the fourth side surface of the battery cell 31 to further improve the fixing effect of the first pre-fixing film 33.

[0134] Please refer to Figure 12 , the first extension portion 331 only partially wraps a partial area of the first side surface 3191. On the one hand, it can increase the adhesion between the first pre-fixing film 33 and the battery cell 31 and improve the fixing effect of the first pre-fixing film 33. On the other hand, it can avoid too large a bending angle of the first extension portion 331, prevent the fracture of the first extension portion 331, and improve the structural stability of the first extension portion 331.

[0135] Please refer to Figures 13 - 14 , the first extension portion 331 wraps the entire area of the first side surface 3191, which can greatly increase the adhesion between the first pre-fixing film 33 and the battery cell 31 and further prevent the loosening of the first pre-fixing film 33; moreover, the welding tape 32 can be fixed on the first side surface 3191 by using the first extension portion 331, which can avoid the warping and loosening of the welding tape 32 in the direction away from the second surface 316 at the position of the first battery edge 311, and greatly improve the fixing effect of the welding tape 32 fixed at the position of the first battery edge 311.

[0136] Please refer to again Figure 12 , as an embodiment of the present invention, the first adhesive film 2 wraps at least a partial area of the side surface. The first adhesive film 2 includes a filling portion 21 that wraps the side surface, and the filling portion 21 is located between the extension portion 330 and the side surface.

[0137] In this embodiment, the filling portion 21 has a buffering effect on the extension portion 330 of the first pre-fixing film 33, which can prevent the extension portion 330 from breaking, improve the structural reliability of the first pre-fixing film 33, and further improve the structural reliability of the solar cell module.

[0138] Specifically, the first extension portion 331 does not completely cover the first side surface 3191 of the battery cell 31. The filling portion 21 of the first adhesive film 2 surrounds a partial area of the first side surface 3191. The filling portion 21 of the first adhesive film 2 is embedded between the first extension portion 3311 of the first extension portion 331 and the first side surface 3191. The filling portion 21 of the first adhesive film 2 can improve the fixing effect of the first pre-fixing film 33. At the same time, the filling portion 21 has a buffering effect on the first extension portion 331 of the first pre-fixing film 33, which can prevent the first extension portion 331 from breaking, improve the structural reliability of the first pre-fixing film 33, and further improve the structural reliability of the solar cell module. Similarly, the second extension portion 332 does not completely cover the second side surface 3192 of the battery cell 31. The filling portion 21 of the first adhesive film 2 surrounds the second side surface 3192. The filling portion 21 of the first adhesive film 2 is embedded between the first extension portion 3311 of the second extension portion 332 and the second side surface 3192, further improving the structural reliability of the first pre-fixing film 33.

[0139] Please refer to Figures 10 - 14 , as an embodiment of the present invention, the extension portion 330 further includes:

[0140] A second extension portion 3312 connected to the first extension portion 3311. The second extension portion 3312 extends away from the battery cell 31 from the first extension portion 3311. The second extension portion 3312 is connected between the first adhesive film 2 and the second adhesive film 4.

[0141] In this embodiment, the second extension portion 3312 of each extension 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 extension portion 330 and the first adhesive film 2 and the second adhesive film 4, and is beneficial to further improving the fixing effect of the first pre-fixing film 33. Among them, the second extension portion 3312 can be arranged parallel to the second surface 316 of the battery cell 31, or the second extension portion 3312 can be arranged non-parallel to the second surface 316 of the battery cell 31.

[0142] As an embodiment of the present invention, the second extension portion 3312 and the first extension portion 3311 are arranged at an angle to each other, that is, the second extension portion 3312 is non-parallel or non-collinear with the first extension portion 3311, and the second extension portion 3312 is bent relative to the first extension portion 3311, which is beneficial to further increasing the bonding force between the extension portion 330 and the adhesive film.

[0143] Please refer to Figure 14, as an embodiment of the present invention, the extension portion 330 further includes a third extension portion 3314 connected to the first extension portion 3311 and extending to the second surface 316, and the third extension portion 3314 surrounds a partial area of the second surface 316.

[0144] In this embodiment, the extension portion 330 is provided with a third extension portion 3314 connected to the first extension portion 3311 and extending to the second surface 316. The third extension portion 3314 surrounds the edge partial area of the second surface 316. By using the cooperation between the third extension portion 3314 and the second surface 316, the extension portion 330 can be surrounded and fixed on the battery cell 31, which can further prevent the first pre-fixing film 33 from detaching from the battery cell 31, further play a role in fixing the first pre-fixing film 33, improve the fixing effect of the first pre-fixing film 33, and further improve the fixing effect of the solder strip 32. At the same time, the third extension portion 3314 can fix the solder strip 32 on the side surface of the battery cell 31, which can greatly improve the reliability of the solder strip 32 fixed on the battery cell 31.

[0145] Please refer to Figure 6 , as an embodiment of the present invention, the thickness D2 of the main body portion 336 is less than the thickness D3 of the battery cell 31.

[0146] In this embodiment, the first pre-fixing film 33 can be flexibly set according to the thickness of the battery cell 31, and the thickness of the first pre-fixing film 33 before lamination is less than the thickness of the battery cell 31. For example, when the thickness of the battery cell 31 is 100 - 180 microns, the thickness of the first pre-fixing film 33 before lamination can be 5 - 150 microns, 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 portion 336 is less than the thickness of the battery cell 31, which is beneficial to the first pre-fixing film 33 to be bent to form the extension portion 330 after lamination, beneficial to increasing the fixing effect of the first pre-fixing film 33, and at the same time can avoid the influence of the over-thickness of the first pre-fixing film 33 on the performance of the solar cell module.

[0147] As an embodiment of the present invention, at least a partial area of the extension portion 330 is provided with a cavity structure (not shown).

[0148] The cavity structure may be provided in the first extension portion 3311 of the extension portion 330, the second extension portion 3312 of the extension portion 330, or both the first extension portion 3311 and the second extension portion 3312. The cavity structure provided in the extension portion 330 can further strengthen the bond between the first adhesive film 2 and the second adhesive film 4 and the extension portion 330, significantly increasing the bonding strength between the extension portion 330 and the first adhesive film 2 and the second adhesive film 4, and improving the fixing effect of the first pre-fixed film 33. Furthermore, the cavity structure provided in the extension portion 330 can act as a buffer, reducing stress on the extension portion 330 and preventing fracture of the extension portion 330. Specifically, the cavity structure can be a hollow cavity or a cavity filled with air.

[0149] As an embodiment of the present invention, the thickness of at least a portion of the first extension portion 3311 is greater than the thickness of the main body portion 336 .

[0150] In this embodiment, the thickness of the first extension portion 3311 may be greater than the thickness of the main portion 336 in only a portion of the first extension portion 3311, or the thickness of the entire first extension portion 3311 may be greater than the thickness of the main portion 336. Since the thickness of at least a portion of the first extension portion 3311 can be greater than the thickness of the main portion 336, the structural strength of the first extension portion 3311 can be further increased, the tensile strength of the first extension portion 3311 can be improved, and the first extension portion 3311 can be prevented from breaking, thereby improving the performance of the first pre-fixed film 33. Furthermore, the bonding strength 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.

[0151] Embodiment 6

[0152] Please refer to Figures 6 - 14 As an embodiment of the present invention, the first pre-fixed film 33 further includes:

[0153] The protrusion structure 335 is provided on the extension portion 330 , and the protrusion structure 335 is connected to the first adhesive film 2 and / or the second adhesive film 4 .

[0154] In the embodiment of the present invention, the protruding structure 335 can be disposed on the side of the extension portion 330 close to the second surface 316 or on the side of the extension portion 330 facing away from the second surface 316. The protruding direction on the extension portion 330 is not limited. The protruding structure 335 can protrude toward the first adhesive film 2 or the second adhesive film 4. Furthermore, the protruding structure 335 can also protrude toward the battery cell 31. The protruding structure 335 can be in the shape of an elongated strip, and the cross-section of the protruding structure 335 can be an arc-shaped protrusion, a sawtooth-shaped protrusion, or other irregularly shaped protrusion.

[0155] Specifically, the convex structure 335 may include a first convex structure 3351 convexly disposed on the first extension portion 331, a second convex structure 3352 convexly disposed on the second extension portion 332, a third convex structure 3353 convexly disposed on the third extension portion 333, and a fourth convex structure 3354 convexly disposed on the fourth extension portion 334. It can be understood that the convex structure 335 may be provided on each of the first extension portion 331, the second extension portion 332, the third extension portion 333, and the fourth extension portion 334, 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 be provided with the convex structure 335. Among them, the structures of the convex structures 335 on each extension portion 330 are the same. Of course, in some other embodiments, the structures of the convex structures 335 on each extension portion 330 may also be different.

[0156] Please refer to Figure 10 , in this embodiment, the first pre-fixing 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. The first convex structure 3351 is located between the first battery edge 311 and the first edge 3301 of the first pre-fixing film 33, the second convex structure 3352 is located between the second battery edge 312 and the second edge 3302 of the first pre-fixing film 33, the third convex structure 3353 is located between the third battery edge 313 and the third edge 3303 of the first pre-fixing film 33, and the fourth convex structure 3354 is located between the fourth battery edge 314 and the fourth edge 3304 of the first pre-fixing film 33. Each extension portion 330 is connected to the first adhesive film 2 and / or the second adhesive film 4 by the convex structure 335 thereon, while further enhancing the bonding force between the first pre-fixing film 33 and the adhesive film, and enhancing the fixing effect of the first pre-fixing film 33; moreover, the convex structure 335 can reduce the tensile force of the extension portion 330, improve the buffering effect, and prevent the extension portion 330 from breaking.

[0157] In this embodiment, the extension portion 330 of the first pre-fixing film 33 is connected to the first adhesive film 2 and / or the second adhesive film 4 by the convex structure 335, further enhancing the bonding force between the extension portion 330 and the adhesive film, and enhancing the fixing effect; moreover, the convex structure 335 can reduce the tensile force of the extension portion 330, play a buffering effect, and prevent the extension portion 330 from breaking.

[0158] As an embodiment of the present invention, the convex structure 335 is disposed on the first extension portion 3311 or the second extension portion 3312.

[0159] In this embodiment, when the convex structure 335 is disposed on the first extension portion 3311 or the second extension portion 3312, the convex structure 335 protrudes from the surface of the first extension portion 3311 or the second extension portion 3312, which is beneficial to increasing the bonding force between the position of the first extension portion 3311 or the second extension portion 3312 and the second adhesive film 4.

[0160] As an embodiment of the present invention, the convex structure 335 is disposed at the connection between the first extension portion 3311 and the second extension portion 3312.

[0161] In this embodiment, when the convex structure 335 is disposed at the connection between the first extension portion 3311 and the second extension portion 3312, the convex structure 335 protrudes from the surface at the connection between the first extension portion 3311 and the second extension portion 3312, which is beneficial to increasing the bonding force between the connection between the first extension portion 3311 and the second extension portion 3312 and the second adhesive film 4. Moreover, the presence of the convex structure 335 is also beneficial to increasing the buffering effect at the connection between the first extension portion 3311 and the second extension portion 3312, and avoiding breakage at the connection between the first extension portion 3311 and the second extension portion 3312. Among them, only the case where the convex structure 335 is disposed at the connection between the first extension portion 3311 and the second extension portion 3312 is schematically shown in the drawings of the present invention.

[0162] As an embodiment of the present invention, the surface of each convex structure 335 away from the first adhesive film 2 is provided as a wavy surface.

[0163] In this embodiment, the surface of each convex structure 335 away from the first adhesive film 2 is provided as a wavy surface. The wavy surface can further increase the bonding force between the convex structure 335 and the second adhesive film 4, further improving the fixing effect of the first pre-fixing film 33, and thus improving the fixing effect of the solder strip 32.

[0164] Please refer to again Figure 10 , as an embodiment of the present invention, each convex structure 335 includes a first side edge 3356 close to the solar cell 31 and a second side edge 3357 away from the solar cell 31, and the first side edge 3356 and the second side edge 3357 are arranged in an uneven connection.

[0165] In this embodiment, the first side edge 3356 and the second side edge 3357 of the convex structure 335 are in a wavy shape of uneven connection, which can further improve the bonding force between the convex structure 335 and the first adhesive film 2 and the second adhesive film 4, and further improve the fixing effect of the first pre-fixing film 33.

[0166] As an embodiment of the present invention, the lengths of the first convex structure 3351 and the second convex structure 3352 along the second direction X are greater than or equal to the length of the battery cell 31 along the second direction X, which is beneficial to further improving the fixing effect of each welding strip 32.

[0167] As an embodiment of the present invention, the lengths of the third convex structure 3353 and the fourth convex structure 3354 along the first direction Y are greater than or equal to the length of the battery cell 31 along the first direction Y, which can further improve the fixing effect of the first pre-fixing film 33.

[0168] As an embodiment of the present invention, the projected lengths of the first convex structure 3351 and the second convex structure 3352 along the first direction Y are both 10 to 200 micrometers.

[0169] In this embodiment, by controlling the projected lengths of the first convex structure 3351 and the second convex structure 3352 along the first direction Y to be both 10 to 200 micrometers, the good buffering effect of the first convex structure 3351 and the second convex structure 3352 can be ensured, the breakage of the first extension portion 331 and the second extension portion 332 can be avoided, and at the same time, the sufficient contact area between the first convex structure 3351 and the second convex structure 3352 and the first adhesive film 2 and the second adhesive film 4 can be guaranteed, ensuring a more appropriate bonding force between the first pre-fixing film 33 and the first adhesive film 2 and the second adhesive film 4; moreover, the first convex structure 3351 and the second convex structure 3352 can play a good limiting role on the welding strip 32.

[0170] As an embodiment of the present invention, at the position of the second adhesive film 4 corresponding to the convex structure 335, a groove matching the convex structure 335 is formed, and the convex structure 335 is embedded in the groove.

[0171] In this embodiment, the convex structure 335 is embedded in the groove of the second adhesive film 4, so that a concave-convex matching structure is formed between the first pre-fixing film 33 and the second adhesive film 4, which can further prevent the first pre-fixing film 33 from loosening relative to the second adhesive film 4 and improve the fixing effect between the first pre-fixing film 33 and the second adhesive film 4.

[0172] Please refer to Figure 11 , as an embodiment of the present invention, on the surface of the first extension portion 331 facing away from the convex structure 335, a first positioning groove formed by a depression is provided, and at the position of the first adhesive film 2 corresponding to the first positioning groove, a first positioning protrusion 22 is formed, and the first positioning protrusion 22 is embedded in the first positioning groove.

[0173] In this embodiment, the first adhesive film 2 forms a first positioning protrusion at the position corresponding to the first positioning groove, so that a concave-convex matching structure is formed between the first pre-fixing film 33 and the first adhesive film 2, which can further prevent the first pre-fixing film 33 from loosening relative to the first adhesive film 2 and improve the fixing effect between the first pre-fixing film 33 and the first adhesive film 2.

[0174] As an embodiment of the present invention, the first convex structure 3351 is disposed on the first extension portion 3311 of the first extension portion 331 of the first epitaxial portion 331. The sum of the projection lengths of the first convex structure 3351 and the first extension portion 3311 of the first epitaxial portion 331 in the first direction Y is 30 to 400 micrometers.

[0175] In this embodiment, the sum of the projection lengths of the first convex structure 3351 and the first extension portion 3311 of the first epitaxial portion 331 in the first direction Y is 30 to 400 micrometers, which can ensure a good fixing effect of the first pre-fixing film 33 and play a good role in fixing and limiting the welding strip 32 at the same time.

[0176] As an embodiment of the present invention, the second convex structure 3352 is disposed on the first extension portion 3311 of the second extension portion 332 of the second epitaxial portion 332. The sum of the projection lengths of the second convex structure 3352 and the first extension portion 3311 of the second epitaxial portion 332 in the first direction Y is 30 to 400 micrometers.

[0177] In this embodiment, the sum of the projection lengths of the second convex structure 3352 and the first extension portion 3311 of the second epitaxial portion 332 in the first direction Y is 30 to 400 micrometers, which can ensure a good fixing effect of the first pre-fixing film 33 and play a good role in fixing and limiting the welding strip 32 at the same time.

[0178] Embodiment Seven

[0179] Please refer to Figures 15 - 17 , as another embodiment of the present invention, the battery cell 31 includes a first grid line 317 disposed on the first surface 315 and a second grid line 318 disposed on the second surface 316, and the polarities of the first grid line 317 and the second grid line 318 are opposite;

[0180] The welding strip 32 further includes a second welding portion 322 and a connecting portion 320. The connecting portion 320 connects the first welding portion 321 and the second welding portion 322. The first welding portion 321 connects the first grid line 317 on one battery cell 31, and the second welding portion 322 connects the second grid line 318 on another battery cell 31.

[0181] In this embodiment, the battery cell 31 is a double-sided contact solar cell, and grid lines are disposed on both the first surface 315 and the second surface 316 of the battery cell 31. Specifically, the polarities of the first grid lines 317 on the first surface 315 are the same, the polarities of the second grid lines 318 on the second surface 316 are the same, and one of the first grid line 317 and the second grid line 318 is a positive electrode fine grid line, and the other is a negative electrode fine grid line. For example, the first grid line 317 is a positive electrode fine grid line, and the second grid line 318 is a negative electrode fine grid line.

[0182] Among them, the first welding part 321 of the welding strip 32 is located on the first surface 315 of a cell 31 and is connected to the first grid line 317 of the cell 31. The second welding part 322 of the welding strip 32 is located on the second surface 316 of another cell 31 and is connected to the second grid line 318 of the cell 31, realizing the series connection between adjacent cells 31.

[0183] Embodiment Eight

[0184] Please refer to Figures 17 - 19 , on the basis of Embodiment Seven, the solar cell module further includes:

[0185] A second pre-fixing film 36 located on the second surface 316. The second pre-fixing film 36 is disposed on the second welding part 322 and fixedly connects the second welding part 322 to the second surface 316, and the second pre-fixing film 36 does not extend beyond the edge of the cell 31.

[0186] In this embodiment, by providing the second pre-fixing film 36 on the second surface 316 of the cell 31, the second welding part 322 of the welding strip 32 is fixed on the second surface 316 by using the second pre-fixing film 36, thereby realizing the fixation of the welding strip 32. At the same time, the second pre-fixing film 36 does not extend beyond the outside of the cell 31, that is, the second pre-fixing film 36 does not exceed the edge of the cell 31, avoiding the overlapping of the extended part 330 of the first pre-fixing film 33 and the second pre-fixing film 36, and reducing the material cost.

[0187] Among them, the material and thickness of the second pre-fixing film 36 can be the same as or different from those of the first pre-fixing film 33.

[0188] Embodiment Nine

[0189] Please refer to Figure 20 and Figure 21 , on the basis of Embodiment Seven, it further includes:

[0190] A second pre-fixing film 36 located on the second surface 316. The second pre-fixing film 36 is disposed on the second welding part 322 and fixedly connects the second welding part 322 to the second surface 316. The second pre-fixing film 36 extends to the outside of the edge of the cell 31 to form at least one extended part 361. The extended part 361 is connected to the first adhesive film 2, and the projection area of the extended part 361 on the plane where the second surface 316 is located does not overlap with the projection area of the extended part 330 on the plane where the second surface 316 is located.

[0191] In this embodiment, the cell 31 is a double-sided contact solar cell. The first pre-fixing film 33 extends outward from the cell 31 to form an epitaxial portion 330. The use of the epitaxial portion 330 improves the fixing stability of the first pre-fixing film 33, thereby enhancing the reliability of the solder strip 32 fixed on the first surface 315. The use of the extension portion 361 improves the fixing stability of the second pre-fixing film 36, thereby enhancing the reliability of the solder strip 32 fixed on the second surface 316, and further enhancing the structural reliability of the solar cell module.

[0192] In this embodiment, since the projection area of the extension portion 361 on the plane where the second surface 316 is located does not overlap with the projection area of the epitaxial portion 330 on the plane where the second surface 316 is located, after lamination, the extension portion 361 and the epitaxial portion 330 do not overlap; between adjacent cells 31 of the cell string, on one side edge of the cell 31 where the epitaxial portion 330 is provided, there is no extension portion 361, and on the side edge of the cell 31 where the extension portion 361 is provided, there is no epitaxial portion 330, realizing the dislocation arrangement of the extension portion 361 of the second pre-fixing film and the epitaxial portion 330 of the first pre-fixing film, ensuring that the extension portion 361 and the epitaxial portion 330 do not overlap, avoiding the generation of bubbles due to the overlap of the extension portion 361 and the epitaxial portion 330, and enhancing the structural reliability of the solar cell module.

[0193] As an embodiment of the present invention, the first pre-fixing films 33 on two adjacent cells 31 can be connected to each other to improve the fixing effect of the first pre-fixing film 33. Of course, the first pre-fixing films 33 on two adjacent cells 31 can also not be connected; the second pre-fixing films 36 on two adjacent cells 31 can be connected to each other to improve the fixing effect of the second pre-fixing film 36. Of course, the second pre-fixing films 36 on two adjacent cells 31 can also not be connected.

[0194] As an embodiment of the present invention, the first pre-fixing film 33 includes a first epitaxial portion 331 extending outward from the position of the first cell edge 311 of the cell 31, and the second pre-fixing film 36 includes an extension portion 361 extending outward from the position of the second cell edge 312 of the cell 31. The first epitaxial portions 331 between adjacent cells 31 are adjacent to each other or the extension portions 361 between adjacent cells 31 are adjacent to each other. Among them, the first epitaxial portions 331 between the cells 31 can overlap or not overlap, and the extension portions 361 between the cells 31 can overlap or not overlap.

[0195] Among them, the extension parts 330 of the first pre-fixing films 33 between adjacent solar cells 31 can overlap to form a first overlapping part 300, and the thickness D1 of the first overlapping part 300 is greater than the thickness D2 of the main body part 336; the extension parts 361 between adjacent solar cells 31 can overlap to form a second overlapping part 400, and the thickness D4 of the second overlapping part 400 is greater than the thickness of the part of the second pre-fixing film 36 covering the second surface 316. Thus, adjacent first pre-fixing films 33 are fixed and limited to each other, and adjacent second pre-fixing films 36 are fixed and limited to each other, which can improve the reliability of the fixing of the solder tapes 32 by the first pre-fixing films 33 and the second pre-fixing films 36.

[0196] Embodiment Ten

[0197] Please refer to Figure 1 and Figure 22 As an embodiment of the present invention, the distance L4 between the first battery string 301 and the second battery string 302 in the battery string unit 30 is greater than the distance L5 between the second battery string 302 and the first battery string 301 of the adjacent battery string unit 30. By increasing the distance between the first battery string 301 and the second battery string 302 in the battery string unit 30, it is convenient to install the corresponding junction box and bypass diode in the battery string unit 30, and it is convenient for the assembly of the solar cell module. Similarly, the distance between the third battery string 303 and the fourth battery string 304 in the battery string unit 30 is greater than the distance between the fourth battery string 304 and the third battery string 303 of the adjacent battery string unit 30, which is also beneficial to the installation of the junction box and bypass diode and is convenient for the assembly of the solar cell module.

[0198] Please refer to Figure 22 As an embodiment of the present invention, the battery string includes a first solar cell 3101 at its first end. The first solar cell 3101 is connected to the edge bus bar 306, and the distance between the first solar cell 3101 and the edge bus bar 306 is L2. The first extension part 331 of the first pre-fixing film 33 on the first solar cell 3101 extends towards the edge bus bar 306, and the projection length of the first extension part 331 in the first direction Y is less than L2.

[0199] In this embodiment, the first extension part 331 of the first pre-fixing film 33 on the first solar cell 3101 extends towards the edge bus bar 306, and the projection length of the first extension part 331 in the first direction Y is less than L2, which avoids the first extension part 331 of the first pre-fixing film 33 completely covering the extended part of the solder tape 32, can ensure good welding between the solder tape 32 and the edge bus bar 306, and the first extension part 331 has a good fixing effect on the part of the solder tape 32 extending out of the edge of the first solar cell 3101.

[0200] As an embodiment of the present invention, the battery string includes a second cell 3102 located at the second end. The second cell 3102 is connected to an intermediate bus bar 308. The distance between the second cell 3102 and the intermediate bus bar 308 is L3. The second extension portion 332 of the first pre-fixing film 33 of the second cell 3102 extends towards the intermediate bus bar 308, and the projection length of the second extension portion 332 in the first direction Y is less than L3.

[0201] In this embodiment, the distance between the second cell 3102 and the intermediate bus bar 308 connected thereto is L3. The projection length of the first extension portion 331 of the first pre-fixing film 33 on the second cell 3102 in the first direction Y is less than L3, which avoids the second extension portion 332 of the first pre-fixing film 33 on the second cell 3102 completely covering the protruding part of the solder tape 32, and can ensure good welding between the protruding part of the solder tape 32 at the second end of the battery string and the intermediate bus bar 308. At the same time, the second extension portion 332 has a good fixing effect on the part of the solder tape 32 extending out of the edge position of the second cell 3102.

[0202] Please refer to Figure 22 , the battery module includes at least two battery strings arranged at intervals in sequence along the second direction X. The sum of the projection lengths of the third extension portion 333 and the fourth extension portion 334 in the second direction X is less than the distance between two battery strings arranged at intervals in the second direction X. This can not only utilize the third extension portion 333 and the fourth extension portion 334 to increase the fixing effect of the first pre-fixing film 33, but also prevent the first pre-fixing films 33 on two adjacent battery strings in the second direction X from overlapping, which is beneficial to reducing the cost of the first pre-fixing film 33.

[0203] Wherein, the distance between the first battery string 301 and the second battery string 302 in each battery string unit 30 is L4. The fourth extension portion 334 of the first pre-fixing film 33 on the first battery string 301 is adjacent to the third extension portion 333 of the first pre-fixing film 33 on the second battery string 302, and the projection lengths of the fourth extension portion 334 of the first pre-fixing film 33 on the first battery string 301 and the third extension portion 333 of the first pre-fixing film 33 on the second battery string 302 in the second direction X are less than L4 / 2.

[0204] In this embodiment, by controlling the projection lengths of the fourth extension portion 334 of the first pre-fixing film 33 on the first battery string 301 and the third extension portion 333 of the first pre-fixing film 33 on the second battery string 302 in the second direction X to be less than L4 / 2, it can not only increase the fixing effect of the first pre-fixing film 33, but also prevent the first pre-fixing films 33 on the cells 31 of the first battery string 301 and the cells 31 of the second battery string 302 from overlapping, which is beneficial to reducing the cost of the first pre-fixing film 33.

[0205] Example XI

[0206] The embodiment of the present invention further provides a photovoltaic system, which includes the solar cell module of the above embodiment. It should be noted that the photovoltaic system and the above solar cell module have the same or similar beneficial effects, and the relevant parts between the two can be referred to each other. To avoid repetition, it will not be elaborated here.

[0207] In this embodiment, the photovoltaic system can be applied in a photovoltaic power station, such as a ground power station, a rooftop power station, a water surface power station, etc., or in a device or apparatus that uses solar energy for power generation, such as a user solar power supply, a solar street lamp, a solar car, a solar building, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is to say, the photovoltaic system can be applied in all fields that require solar power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a busbar box, and an inverter. The photovoltaic array can 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 busbar box, and the busbar box can converge the current generated by the photovoltaic array. The converged current flows through the inverter and is converted into alternating current required by the commercial power grid and then connected to the commercial power grid to achieve solar power supply.

[0208] In the description of this specification, the description with reference to terms such as "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0209] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solar cell module, characterized in that, Comprising a first cover plate, a first encapsulant film, at least one cell string, a second encapsulant film and a second cover plate which are sequentially stacked, the cell string comprising: A plurality of solar cells arranged at intervals in a first direction, the solar cells comprising a first surface and a second surface which are oppositely arranged; A plurality of welding ribbons, adjacent two of the solar cells being connected by the welding ribbons, the welding ribbons extending along the first direction, the plurality of welding ribbons being arranged at intervals in a second direction, the second direction intersecting the first direction, the welding ribbons comprising first welding portions arranged on the first surface; and A plurality of first pre-fixing films, each first pre-fixing film being arranged on a corresponding solar cell, the first pre-fixing film being arranged on the first welding portion and fixedly connected to the first surface, the second encapsulant film covering the first pre-fixing film; the first pre-fixing film comprising a main body portion covering the first surface and at least one extension portion connected to the main body portion and extending to the outside of the edge of the solar cell, the extension portion being connected to the first encapsulant film and the second encapsulant film, at least two adjacent first pre-fixing films in the cell string having the extension portions overlapping and connecting in the thickness direction of the solar cell; the extension portion comprising a first extension portion and a second extension portion, the first extension portion and the second extension portion being respectively arranged at opposite ends of the main body portion in the first direction, the first extension portion and the second extension portion being bent towards the plane where the second surface is located at the same time, the first extension portion of the first pre-fixing film overlapping and connecting with the second extension portion of the adjacent first pre-fixing film.

2. The solar cell module according to claim 1, wherein, The solar cell comprises a first cell edge and a second cell edge which are oppositely arranged in the first direction; The first extension portion covers the first cell edge and extends to the outside of the first cell edge, and the second extension portion covers the second cell edge and extends to the outside of the second cell edge.

3. The solar cell module according to claim 2, wherein, The distance between two adjacent solar cells in the cell string is L1, the projection length of the first extension portion in the first direction is S1, the projection length of the second extension portion in the first direction is S2, and the sum of S1 and S2 is greater than L1.

4. The solar cell module according to claim 3, wherein Both S1 and S2 are greater than L1 / 2, and both S1 and S2 are less than L1.

5. The solar cell module according to claim 1, wherein The extension portions of the first pre-fixing films on two adjacent solar cells overlap and connect to form a first overlapping portion, and the thickness of the first overlapping portion is greater than the thickness of the main body portion.

6. The solar cell module according to claim 5, characterized in that, The projection length of the first overlapping portion in the first direction is less than the distance between two adjacent solar cells in the cell string.

7. The solar cell module according to claim 5, wherein, The first overlapping portion is provided with a cavity structure.

8. The solar cell module according to claim 2, characterized in that, The cell string comprises a first solar cell at its first end, the first solar cell being connected to an edge bus bar, the distance between the first solar cell and the edge bus bar being L2, the first extension portion of the first pre-fixing film on the first solar cell extending towards the edge bus bar, and the projection length of the first extension portion of the first pre-fixing film on the first solar cell in the first direction being less than L2.

9. The solar cell module according to claim 8, characterized in that, The battery string includes a second cell located at its second end. The second cell is connected to an intermediate bus bar, and the distance between the second cell and the intermediate bus bar is L3. The second extension portion of the first pre-fixing film on the second cell extends towards the intermediate bus bar, and the projection length of the second extension portion of the first pre-fixing film on the second cell in the first direction is less than L3.

10. The solar cell module according to claim 2, characterized in that, The cell includes a third cell edge and a fourth cell edge oppositely arranged 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 are respectively connected to opposite ends of the main body portion along the second direction. The third extension portion covers the third cell edge and extends outside the third cell edge, and the fourth extension portion covers the fourth cell edge and extends outside the fourth cell edge.

11. The solar cell module according to claim 10, wherein The projection lengths of the third extension portion and the fourth extension portion in the second direction are both less than the projection lengths of the first extension portion and the second extension portion in the first direction.

12. The solar cell module according to claim 1, characterized in that, The 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 solder strip includes two first welding portions and a connecting portion connecting the two first welding portions. One first welding portion is connected to the first grid line on one cell, and the other first welding portion is connected to the second grid line on the other cell.

13. The solar cell module according to claim 1, wherein The first pre-fixing film includes at least one of a PVB film, an EVA film, an EPE film, an EP film, and a POE film.

14. A photovoltaic system, characterized in that, A solar cell module comprising the solar cell module according to any one of claims 1 to 13.

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