Solar cell module and photovoltaic system

Abstract

The invention is applicable to the technical field of solar cells, and provides a solar cell module and a photovoltaic system.The solar cell module comprises a first cover plate, a first adhesive film, a cell string, a second adhesive film and a second cover plate, the cell string comprises the first cover plate, the first adhesive film, the cell string, the second adhesive film and the second cover plate, and the cell string comprises a plurality of cell pieces, the battery piece comprises a first surface and a second surface; every two adjacent battery pieces are connected through the corresponding welding strip, and each welding strip comprises a first welding part arranged on the first surface; the plurality of first pre-fixing films are arranged on the first welding part and are fixedly connected with the first surface; the first pre-fixing film comprises a main body part, an extension part and a bulge structure which is convexly arranged on the extension part, the extension part is connected with the first adhesive film and the second adhesive film, and the bulge structure is connected with the first adhesive film and / or the second adhesive film. According to the solar cell module, the fixing effect of the pre-fixing film on the welding strip can be improved, and the reliability of the solar cell module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and particularly 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 illumination conditions, a photocurrent is generated inside the solar cell, and the electrical energy is output through electrodes. In recent years, the production technology of solar cells has been continuously improved, 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-gridless 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 and realize the connection between the cell wafers. However, after the solar cell module is laminated, the pre-fixing film usually does not extend beyond the edge position of the cell wafer, and the pre-fixing film is not firmly fixed on the cell wafer, 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 that in the prior art, 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 realized as follows. It includes a first cover plate, a first adhesive film, at least one battery string, a second adhesive film, and a second cover plate that are sequentially stacked. The battery string includes:

[0006] A plurality of cell wafers arranged at intervals along a first direction, and the cell wafer includes a first surface and a second surface that are oppositely arranged;

[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, and a plurality of the 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-fixing films, each of the first pre-fixing films is disposed on a corresponding solar cell, the first pre-fixing film is disposed on the first welding portion and fixedly connected to the first surface, and the second adhesive film covers the first pre-fixing film; the first pre-fixing film includes a main body portion covering the first surface, an extension portion connected to the main body portion and extending outside the edge of the solar cell, and a convex structure protruding on the extension portion, the extension portion is connected to the first adhesive film and the second adhesive film, and the convex structure is connected to the first adhesive film and / or the second adhesive film.

[0009] Preferably, the convex structure is disposed on the surface of the extension portion close to the second adhesive film, and the convex structure is embedded in the second adhesive film.

[0010] Preferably, the convex structure is disposed on the surface of the extension portion close to the first adhesive film, and the convex structure is embedded in the first adhesive film.

[0011] Preferably, the convex structure is simultaneously disposed on the surface of the extension portion close to the second adhesive film and the surface of the extension portion close to the first adhesive film. The convex structure on the surface of the extension portion close to the second adhesive film is embedded in the second adhesive film, and the convex structure on the surface of the extension portion close to the first adhesive film is embedded in the first adhesive film.

[0012] Preferably, the solar cell includes a first cell edge and a second cell edge oppositely disposed along the first direction;

[0013] 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, and the second extension portion covers the second cell edge and extends outside the second cell edge.

[0014] Preferably, the convex structure includes a first convex structure protruding on the first extension portion and a second convex structure protruding on the second extension portion. The first convex structure and the second convex structure are respectively connected to the first adhesive film and / or the second adhesive film.

[0015] Preferably, each convex structure includes a first side edge close to the solar cell and a second side edge far from the solar cell, and the first side edge and the second side edge are arranged in a concave-convex connection.

[0016] Preferably, the surface of the convex structure close to the second adhesive film is set as a wavy surface.

[0017] Preferably, the projection lengths of the first convex structure and the second convex structure in the second direction are greater than or equal to the length of the battery cell in the second direction.

[0018] Preferably, the battery cell includes a third battery edge and a fourth battery edge oppositely arranged in the second direction; the epitaxial portion includes a third epitaxial portion and a fourth epitaxial portion respectively connected to opposite ends of the main body portion in the second direction, the third epitaxial portion covers the third battery edge and extends outside the third battery edge, and the fourth epitaxial portion covers the fourth battery edge and extends outside the fourth battery edge.

[0019] Preferably, the convex structure further includes a third convex structure convexly arranged on the third epitaxial portion and a fourth convex structure convexly arranged on the fourth epitaxial portion, and the third convex structure and the fourth convex structure are respectively connected to the first adhesive film and / or the second adhesive film.

[0020] Preferably, the convex structure is arranged on the surface of the epitaxial portion close to the second adhesive film, and a groove matching the convex structure is formed at the position of the second adhesive film corresponding to the convex structure, and the convex structure is embedded in the groove.

[0021] Preferably, a positioning groove formed by a depression is arranged on the surface of the first epitaxial portion facing away from the convex structure, and a positioning protrusion is formed at the position of the first adhesive film corresponding to the positioning groove, and the positioning protrusion is embedded in the positioning groove.

[0022] Preferably, the projection lengths of the first convex structure and the second convex structure in the first direction are both 10 to 200 microns.

[0023] Preferably, the projection lengths of the third convex structure and the fourth convex structure in the second direction are both 10 to 200 microns.

[0024] Preferably, the battery cell includes a side surface connecting the first surface and the second surface, and the epitaxial portion surrounds at least a part of the side surface.

[0025] Preferably, the battery cell includes a first grid line and a second grid line arranged on the first surface, the first grid line and the second grid line are arranged at intervals in the first direction, and the polarities of the first grid line and the second grid line are opposite;

[0026] The welding tape 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 battery cell, and the other first welding portion is connected to the second grid line on the other battery cell.

[0027] Preferably, the cell includes a first grid line disposed on the first surface and a second grid line disposed on the second surface, and the polarities of the first grid line and the second grid line are opposite;

[0028] The solder strip further includes a second welding portion and a connecting portion. The connecting portion connects the first welding portion and the second welding portion. The first welding portion is disposed on the first surface and connected to the first grid line, and the second welding portion is disposed on the second surface and connected to the second grid line.

[0029] 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.

[0030] The present invention further provides a photovoltaic system, including the above-mentioned solar cell module.

[0031] A solar cell module provided by the present invention fixes the solder strip on the first surface by disposing a first pre-fixing film on the first surface of the cell. 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 cell by using the main body portion covering the first surface, the extension portion is simultaneously connected to the first adhesive film and the second adhesive film, increasing the fixing area of the first pre-fixing film, making the fixing of the first pre-fixing film more stable, thereby improving the fixing reliability of the first pre-fixing film to the solder strip; moreover, a convex structure is provided on the extension portion, and the extension portion is connected to the first adhesive film and / or the second adhesive film by using the convex structure, which can improve the bonding force between the extension portion of the first pre-fixing film and the adhesive film, enhance the fixing effect of the first pre-fixing film, and further improve the fixing effect of the first pre-fixing film to the solder strip; in addition, the convex structure provided on the extension portion can reduce the tensile force of the extension portion, and the convex structure can play a buffering effect on the extension portion, preventing the extension portion from breaking, realizing a stable connection between the extension portion and the first adhesive film or the second adhesive film, thereby greatly improving the fixing reliability of the first pre-fixing film, and further improving the fixing reliability of the first pre-fixing film to the solder strip. Description of the Drawings

[0032] Figure 1 It is a schematic plan view of a solar cell module provided by an embodiment of the present invention;

[0033] Figure 2 It is a schematic plan view of a battery string of a solar cell module provided by an embodiment of the present invention;

[0034] Figure 3 It is a schematic plan view of a partial structure of a solar cell module provided by an embodiment of the present invention;

[0035] Figure 4A plan view of a single cell connection solder tape of a battery string of a solar cell module provided by an embodiment of the present invention;

[0036] Figure 5 A cross-sectional view of the connection solder tapes of two adjacent cells of a battery string of a solar cell module provided by an embodiment of the present invention;

[0037] Figure 6 A cross-sectional view of a solar cell module provided by an embodiment of the present invention along a first direction;

[0038] Figure 7 Another cross-sectional view of a solar cell module provided by an embodiment of the present invention along a first direction;

[0039] Figure 8 A cross-sectional view of a solar cell module provided by an embodiment of the present invention along a second direction;

[0040] Figure 9 A plan view of a cell of a solar cell module provided by an embodiment of the present invention after covering a first pre-fixed film;

[0041] Figure 10 A cross-sectional view of a first solar cell module provided by an embodiment of the present invention;

[0042] Figure 11 A cross-sectional view of a second solar cell module provided by an embodiment of the present invention;

[0043] Figure 12 A cross-sectional view of a third solar cell module provided by an embodiment of the present invention;

[0044] Figure 13 A cross-sectional view of a fourth solar cell module provided by an embodiment of the present invention;

[0045] Figure 14 Another cross-sectional view of a solar cell module provided by an embodiment of the present invention;

[0046] Figure 15 A plan view of a single cell connection solder tape of another solar cell module provided by an embodiment of the present invention;

[0047] Figure 16 Another plan view of a single cell connection solder tape of another solar cell module provided by an embodiment of the present invention;

[0048] Figure 17 A cross-sectional view of the connection solder tapes of adjacent cells of another solar cell module provided by an embodiment of the present invention;

[0049] Figure 18 A cross-sectional schematic view of another solar cell module provided by an embodiment of the present invention;

[0050] Figure 19 Another cross-sectional schematic view of another solar cell module provided by an embodiment of the present invention;

[0051] Figure 20 A cross-sectional schematic view of yet another solar cell module provided by an embodiment of the present invention;

[0052] Figure 21 Another cross-sectional schematic view of yet another solar cell module provided by an embodiment of the present invention;

[0053] Figure 22 Another planar schematic view of a solar cell module provided by an embodiment of the present invention. Detailed implementation manners

[0054] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, 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, where the same or similar reference numerals denote 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 of 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.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "back", "front", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are 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 of the present invention.

[0056] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0057] 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 merely 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. 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 can be aware of the application of other processes and / or the use scenarios of other materials.

[0058] Embodiment 1

[0059] Please refer to Figures 1 - 10 , 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:

[0060] A plurality of solar cells 31 that are sequentially arranged at intervals along the first direction Y. The solar cells 31 include a first surface 315 and a second surface 316 that are oppositely arranged;

[0061] A plurality of welding tapes 32. Adjacent two solar cells 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 with the first direction Y. The welding tapes 32 include a first welding portion 321 disposed on the first surface 315; and

[0062] A plurality of first pre-fixing films 33. Each first pre-fixing film 33 is disposed on a corresponding solar cell 31. Each 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 films 33. The first pre-fixing film 33 includes a main body portion 336 covering the first surface 315, an extension portion 330 connected to the main body portion 336 and extending outside the edge of the solar cell 31, and a convex structure 335 protruding from the extension portion 330. The extension portion 330 is connected to the first encapsulant film 2 and the second encapsulant film 4. The convex structure 335 is connected to the first encapsulant film 2 and / or the second encapsulant film 4.

[0063] In an embodiment of the present invention, the solar cell module includes at least one battery string. When the solar cell module includes a plurality of battery strings, the plurality of battery strings can be arranged in multiple rows and multiple columns. The solar cells 31 within each battery string are connected in series by the welding tapes 32. Different battery strings can be connected in series or in parallel through bus bars to achieve current collection and output. The plurality of battery strings can form a solar cell array and are encapsulated together by the first cover plate 1, the first encapsulant film 2, the second encapsulant film 4, and the second cover plate 5 to form a solar cell module.

[0064] 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:

[0065] A first battery string 301 and a second battery string 302 arranged at intervals along the second direction X;

[0066] A third battery string 303 and a fourth battery string 304 arranged at intervals along the second direction X. The first battery string 301 and the third battery string 303 are arranged along the first direction Y, and the second battery string 302 and the fourth battery string 304 are arranged along the first direction Y.

[0067] 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 the adjacent battery string unit 30, and the fourth battery string 304 of each battery string unit 30 is adjacent to and connected in series with the third battery string 303 of the adjacent battery string unit 30.

[0068] 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 bus bar 306, and the third battery string 303 and the fourth battery string 304 are also connected in series through an edge bus bar 306. The first battery string 301 and the third battery string 303 are connected in parallel through an intermediate bus bar 308, and the second battery string 302 and the fourth battery string 304 are connected in parallel through an intermediate bus bar 308. The second battery string 302 of the battery string unit 30 is also connected in series with the first battery string 301 of the adjacent battery string unit 30 through the intermediate bus bar 308, and the fourth battery string 304 of each battery string unit 30 is also connected in series with the third battery string 303 of the adjacent battery string unit 30 through the intermediate bus bar 308. Of course, other connection methods can also be used to achieve the series-parallel connection between the battery strings.

[0069] Wherein, Figure 1 only three battery string units 30 are schematically shown. The battery string units 30 are arranged at intervals in sequence along the second direction X, and 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.

[0070] In an embodiment of the present invention, a provided solar cell module fixes a welding tape 32 on a first surface 315 by disposing a first pre-fixing film 33 on the first surface 315 of a cell 31 in a cell string, and the welding tape 32 is fixed on the first surface 315 without a welding process; meanwhile, the first pre-fixing film 33 is configured to include a main body portion 336 and an extension portion 330 connected to and extending outside the cell 31 from the main body portion 336. On the premise that the first pre-fixing film 33 is fixedly connected to the first surface 315 by using the main body portion 336, the extension portion 330 is simultaneously connected to the first adhesive film 2, making the fixation of the first pre-fixing film 33 more stable, thereby improving the fixing effect of the first pre-fixing film 33 on the welding tape 32. Moreover, by connecting the extension portion 330 to the first adhesive film 2, the pre-fixing effect of the first pre-fixing film 33 on the welding tape 32 before lamination can be improved.

[0071] Furthermore, by disposing a convex structure 335 on the extension portion 330, the extension portion 330 is connected to the first adhesive film 2 and / or the second adhesive film 4 by using the convex structure 335, which can improve the bonding force between the extension portion 330 of the first pre-fixing film 33 and the adhesive film, enhance the fixing effect of the first pre-fixing film 33, and improve the fixing effect of the first pre-fixing film 33 on the welding tape 32; moreover, the convex structure 335 disposed on the extension portion 330 can reduce the tension of the extension portion 330, and the convex structure 335 can play a buffering effect to prevent the extension portion 330 from breaking, greatly improving the fixing reliability of the first pre-fixing film 33, and further improving the fixing reliability of the first pre-fixing film 33 on the welding tape 32.

[0072] 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 of the second surface 316. A part of the extension portion 330 is located above the plane of the first surface 315, and another part of the extension portion 330 is located below the plane of the first surface 315. The bent extension portion 330 and the cell 31 form a limiting and matching structure, which can well prevent the first pre-fixing film 33 from loosening and shifting, making the first pre-fixing film 33 stably fixed on the cell 31. Meanwhile, 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 on the welding tape 32.

[0073] In the embodiment of the present invention, one of the first surface 315 and the second surface 316 of the cell 31 is a light-facing surface, and the other is a backlight surface. The cell 31 can be a back-contact solar cell or a double-sided contact solar cell. Specifically, when the cell 31 is a back-contact solar cell, only the first surface 315 of the cell 31 has grid lines. For example, the cell 31 can be an IBC solar cell or an HBC solar cell. When the cell 31 is a double-sided contact cell, both the first surface 315 and the second surface 316 of the cell 31 have grid lines. For example, the cell 31 can be a Topcon solar cell.

[0074] 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; alternatively, one of the first cover plate 1 and the second cover plate 5 is glass, and the other is a backplane, that is, the solar cell module can be a single-glass module.

[0075] In the embodiment of the present invention, each cell string includes a plurality of solder tapes 32, and the specific number of solder tapes 32 in each cell string is not limited, and the specific number of solder tapes 32 can be flexibly set according to actual applications. Specifically, each solder tape 32 extends along the first direction Y, that is, the length direction of the solder tape 32 is the first direction Y, and the solder tapes 32 are sequentially arranged at intervals along the second direction X.

[0076] In the 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 cell 31, so that the first welding portion 321 of the solder tape 32 is fixed on the first surface 315 of the cell 31, and the extension portion 330 extends beyond the cell edge of the cell 31 to be connected to the first adhesive film 2 and the second adhesive film 4.

[0077] In the embodiment of the present invention, the number of the first pre-fixing films 33 is adapted to the number of the cells 31, and one first pre-fixing film 33 is correspondingly arranged on each cell 31, which is convenient for fixing the solder tapes 32 on each cell 31 and for performing the film covering process of the first pre-fixing film 33. Each first pre-fixing film 33 forms an extension portion 330 at at least one cell edge of the corresponding cell 31, or an extension portion 330 can be formed at each cell edge of the 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 cell 31.

[0078] Please refer to Figures 4 - 9 , in the embodiment of the present invention, the cell 31 includes a first cell edge 311 and a second cell edge 312 that are oppositely arranged along the first direction Y, and a third cell edge 313 and a fourth cell edge 314 that are oppositely arranged along the second direction X.

[0079] Among them, the extension part 330 may include a first extension part 331 connected to the main body part 336 and extending along the first direction Y to the outside of the first battery edge 311, a second extension part 332 connected to the main body part 336 and extending along the first direction Y to the outside of the second battery edge 312, a third extension part 333 connected to the main body part 336 and extending along the second direction X to the outside of the third battery edge 313, and a fourth extension part 334 connected to the main body part 336 and extending along the second direction X to the outside of the fourth battery edge 314. Among them, the extension part 330 includes at least one of the first extension part 331, the second extension part 332, the third extension part 333, and the fourth extension part 334.

[0080] Please refer to FIG. 6 - Figure 10 , as an embodiment of the present invention, the battery chip 31 includes a first battery edge 311 and a second battery edge 312 oppositely arranged along the first direction Y;

[0081] The extension part 330 includes a first extension part 331 and a second extension part 332. The first extension part 331 and the second extension part 332 are respectively arranged at opposite ends of the main body part 336 along the first direction Y. The first extension part 331 covers the first battery edge 311 and extends to the outside of the first battery edge 311, and the second extension part 332 covers the second battery edge 312 and extends to the outside of the second battery edge 312.

[0082] In this embodiment, the welding tape 32 extends along the first direction Y. At least some of the welding tapes 32 extend to the outside of the first battery edge 311, and at least some of the welding tapes 32 extend along the first direction Y to the outside of the second battery edge 312. The first extension part 331 is used to cover the position of the first battery edge 311 of the welding tape 32 extending to the outside of the first battery edge 311, and the first extension part 331 wraps around the position of the first battery edge 311 of the welding tape 32, so that the welding tape 32 is not prone to position deviation at the position of the first battery edge 311; at the same time, the second extension part 332 is used to cover the position of the second battery edge 312 of the welding tape 32 extending to the outside of the second battery edge 312, and the second extension part 332 wraps around the position of the second battery edge 312 of the welding tape 32, so that the welding tape 32 is not prone to position deviation at the position of the second battery edge 312, which can greatly improve the fixing stability of the welding tape 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 tape 32 extends beyond the first battery edge 311 is covered and fixed by the first extension part 331, and at least a part of the area where the welding tape 32 extends beyond the second battery edge 312 is covered and fixed by the second extension part 332, avoiding the loosening of the welding tape 32 at the positions of the first battery edge 311 and the second battery edge 312, thereby improving the fixing effect of the welding tape 32 at the positions of the first battery edge 311 and the second battery edge 312.

[0083] As an embodiment of the present invention, the cell 31 further includes a third cell edge 313 and a fourth cell edge 314 that are oppositely arranged along the second direction X; the epitaxial portion 300 includes a third epitaxial portion 333 and a fourth epitaxial portion 334. The third epitaxial portion 333 and the fourth epitaxial portion 334 are respectively connected to opposite ends of the main body portion 336 along the second direction X. The third epitaxial portion 333 covers the third cell edge 313 and extends to the outside of the third cell edge 313, and the fourth epitaxial portion 334 covers the fourth cell edge 314 and extends to the outside of the fourth cell edge 314.

[0084] In this embodiment, the first pre-fixing film 33 is respectively connected to the first adhesive film 2 and the second adhesive film 4 by using the third epitaxial portion 333 and the fourth epitaxial portion 334 distributed along the second direction X. The bent third epitaxial portion 333 and the fourth epitaxial portion 334 form a limiting and matching structure with the 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 solder strip 32, and improve the reliability of the solar cell module.

[0085] 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.

[0086] 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.

[0087] Among them, the first pre-fixing film 33 may be one of a PVB film, an EVA film, an EPE film, an EP film, and a POE film, or may also be a laminate of at least two of a PVB film, an EVA film, an EPE film, an EP film, and a 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).

[0088] In this embodiment, the first adhesive film 2 and the second adhesive film 4 include at least one of a PVB film, an EVA film, an EPE film, an EP film, and a 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.

[0089] 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.

[0090] As an embodiment of the present invention, the thickness of the first pre-fixing film 33 is 5 to 150 μm, 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.

[0091] Embodiment Two

[0092] 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;

[0093] 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 another solar cell 31.

[0094] 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 grid lines are only disposed on the first surface 315 of the solar cell 31. 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 disposed 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.

[0095] In this embodiment, one first welding portion 321 of the welding ribbon 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 ribbon 32 is connected to the corresponding second grid line 318 on the adjacent solar cell 31 to realize the series connection of the adjacent solar cells 31.

[0096] As an embodiment of the present invention, the welding ribbon 32 is disposed 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.

[0097] In this embodiment, the solder ribbon 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 solder ribbon 32 is arranged perpendicular to the first grid line 317 and the second grid line 318. Of course, in other possible embodiments, the solder ribbon 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 solder ribbon 32 intersects with the first grid line 317 and the second grid line 318.

[0098] As Figure 4 shown, in this embodiment, an insulating layer 310 is provided between the solder ribbon 32 connected to the first grid line 317 and the second grid line 318 on each cell 31, and an insulating layer 310 is also provided between the solder ribbon 32 connected to the second grid line 318 and the first grid line 317 on each cell 31, so that good insulation is maintained between the solder ribbon 32 connected to the first grid line 317 and the second grid line 318 on the cell 31, and good insulation is maintained between the solder ribbon 32 connected to the second grid line 318 and the first grid line 317 on the cell 31.

[0099] In this embodiment, the solder ribbon 32 is sequentially placed on the first surface 315. The first welding portion 321 of the solder ribbon 32 contacts the corresponding first grid line 317, and the solder ribbon 32 is fixed on the first surface 315 by using the first pre-fixing film 33, so as to realize the fixation of the solder ribbon 32 and realize the electrical connection between the solder ribbon 32 and the corresponding grid line. Of course, in some other embodiments, the cell 31 may not be provided with grid lines, and the solder ribbon 32 may directly contact the doped polysilicon layer on the cell 31 to realize current collection.

[0100] Embodiment Three

[0101] Please refer to Figures 9 - 10 , as an embodiment of the present invention, each epitaxial portion 330 includes:

[0102] A first extension portion 3311 connected to the main body portion 336, and the first extension portion 3311 is bent relative to the main body portion 336 toward the plane of the second surface 316.

[0103] In this embodiment, each epitaxial portion 330 is bent from the edge of the cell 31 toward the plane of the second surface 316 to form a first extension portion 3311. The first extension portion 3311 is used to cover the edge position of the cell 31. The first part of the first extension portion 3311 is located above the plane of the first surface 315, and the second part of the second extension portion 3312 is located below the plane of the first surface 315, so that the second extension portion 3312 can well limit the movement of the first pre-fixing film 33, and can increase the bonding force between the epitaxial 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 solder ribbon 32.

[0104] Please refer to Figure 10 As an embodiment of the present invention, the first extension portion 3311 includes an upper surface 3310 disposed 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 perpendicular distance from the first end of the upper surface 3310 to the plane where the second surface 316 is located is greater than the perpendicular distance from the second end of the upper surface 3310 to the plane where the second surface 316 is located.

[0105] In this embodiment, since the first extension portion 3311 is bent in a direction close to the plane where the second surface 316 is located, and the perpendicular distance from the first end of the upper surface 3310 to the plane where the second surface 316 is located is greater than the perpendicular 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.

[0106] As an embodiment of the present invention, the perpendicular 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.

[0107] In this embodiment, in the direction from the first end to the second end, the perpendicular 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 between the extension portion 330 and the first adhesive film 2 and the second adhesive film 4.

[0108] 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.

[0109] In this embodiment, the upper surface 3310 of the first extension portion 3311 can be an inclined surface or a curved surface, which is convenient for processing and forming 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 can 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.

[0110] As an embodiment of the present invention, the upper surface 3310 of the first extension portion 3311 is an inclined surface, and the angle C between the inclined surface and the plane where the second surface 316 is located is an acute angle, which can not only improve the fixing effect of the first extension portion 3311, but also make the first extension portion 3311 not easily break, thereby improving the structural reliability of the first pre-fixing film 33.

[0111] As an embodiment of the present invention, the upper surface 3310 of the first extension portion 3311 is an inclined surface, and the angle C between the inclined surface and the plane where the second surface 316 is located is 10° to 80°. In this embodiment, the angle C between the upper surface 3310 of the first extension portion 3311 and the plane where the second surface 316 is located 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 break, and improving the structural reliability of the first pre-fixing film 33. For example, the angle between the inclined surface and the plane where the second surface 316 is located can be any value among 10°, 20°, 30°, 40°, 50°, 60°, 70°, and 80°.

[0112] As another embodiment of the present invention, the upper surface 3310 of the first extension portion 3311 can also be a non-inclined surface, and the angle between the line connecting the first end and the second end of the upper surface 3310 and the plane where the second surface 316 is located is 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.

[0113] Please refer to Figures 10 - 13 , as an embodiment of the present invention, the battery cell 31 includes a side surface 319 connecting the first surface 315 and the second surface 316, and the extension portion 330 wraps at least a partial area of the side surface 319, which can increase the adhesion between the first pre-fixing film 33 and the battery cell 31, make the first pre-fixing film 33 more firmly fixed, and prevent the solder tape 32 from shifting in position.

[0114] As an embodiment of the present invention, the side surface 319 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.

[0115] 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, which can increase the adhesion of the first pre-fixing film 33, make the first pre-fixing film 33 more firmly fixed, and prevent the solder tape 32 from shifting in position.

[0116] As an embodiment of the present invention, the side surface 319 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 sheet 31 to further increase the adhesion between the first pre-fixing film 33 and the battery sheet 31 and improve the fixing effect of the first pre-fixing film 33.

[0117] In addition, the side surface 319 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 sheet 31, and the fourth extension portion 334 wraps at least a partial area of the fourth side surface of the battery sheet 31 to further improve the fixing effect of the first pre-fixing film 33.

[0118] Please refer to Figure 11 , 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 sheet 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 breakage of the first extension portion 331, and improve the structural stability of the first extension portion 331.

[0119] Please refer to Figures 12 - 13 , when the first extension portion 331 wraps the entire area of the first side surface 3191, the adhesion between the first pre-fixing film 33 and the battery sheet 31 can be greatly improved, and the loosening of the first pre-fixing film 33 can be further prevented. Moreover, the welding tape 32 can be fixed on the first side surface 3191 by using the first extension portion 331, and the welding tape 32 can be prevented from warping and loosening away from the second surface 316 at the position of the first battery edge 311, and the fixing effect of the welding tape 32 fixed at the position of the first battery edge 311 can be greatly improved.

[0120] Please refer to Figure 10 and Figure 11 , as an embodiment of the present invention, the first adhesive film 2 wraps at least a partial area of the side surface 319. The first adhesive film 2 includes a filling portion 21 that wraps the side surface 319, and the filling portion 21 is located between the extension portion 330 and the side surface 319.

[0121] In this embodiment, the filling portion 21 has a buffering effect on the extension portion 330 of the first pre-fixing film 33, can avoid the breakage of the extension portion 330, improve the structural reliability of the first pre-fixing film 33, and further improve the reliability of the structure of the solar cell module.

[0122] Specifically, the first outer extension 331 does not completely cover the first side surface 3191 of the battery cell 31. The filling part 21 of the first adhesive film 2 surrounds a partial area of the first side surface 3191. The filling part 21 of the first adhesive film 2 is embedded between the first extension part 3311 of the first outer extension 331 and the first side surface 3191. The filling part 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 part 21 has a buffering effect on the first outer extension 331 of the first pre-fixing film 33, which can avoid breakage of the first outer extension 331 and improve the structural reliability of the first pre-fixing film 33, thereby improving the structural reliability of the solar cell module. Similarly, the second outer extension 332 does not completely cover the second side surface 3192 of the battery cell 31. The filling part 21 of the first adhesive film 2 surrounds the second side surface 3192. The filling part 21 of the first adhesive film 2 is embedded between the first extension part 3311 of the second outer extension 332 and the second side surface 3192, further improving the structural reliability of the first pre-fixing film 33.

[0123] Please refer to Figures 9 - 13 , as an embodiment of the present invention, the outer extension 330 further includes:

[0124] A second extension part 3312 connected to the first extension part 3311, and the second extension part 3312 extends away from the battery cell 31 from the first extension part 3311. The second extension part 3312 is connected between the first adhesive film 2 and the second adhesive film 4.

[0125] In this embodiment, the second extension part 3312 of each outer extension 330 is connected between the first adhesive film 2 and the second adhesive film 4, which can further increase the bonding area between the outer extension 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 part 3312 can be arranged parallel to the second surface 316 of the battery cell 31, or the second extension part 3312 can also be arranged non-parallel to the second surface 316 of the battery cell 31.

[0126] As an embodiment of the present invention, the second extension part 3312 and the first extension part 3311 are arranged at an angle to each other, that is, the second extension part 3312 is non-parallel or non-collinear with the first extension part 3311, and the second extension part 3312 is bent relative to the first extension part 3311, which is beneficial to further increasing the bonding force between the outer extension 330 and the adhesive film.

[0127] Please refer to Figure 13 , as an embodiment of the present invention, the outer extension 330 further includes a third extension part 3314 connected to the first extension part 3311 and extending to the second surface 316, and the third extension part 3314 surrounds a partial area of the second surface 316.

[0128] In this embodiment, the extension portion 330 is provided with a third extension portion 3314 that is connected to the first extension portion 3311 and extends to the second surface 316. The third extension portion 3314 surrounds a partial area of the edge 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 welding strip 32. At the same time, the third extension portion 3314 can fix the welding strip 32 on the side surface of the battery cell 31, which can greatly improve the fixing effect of the welding strip 32 on the battery cell 31.

[0129] Please refer to Figure 14 , 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.

[0130] In this embodiment, the first pre-fixing film 33 can be flexibly set according to the thickness of the battery cell 31. The thickness of the first pre-fixing film 33 before lamination is less than the thickness of the battery cell 31. For example, 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. Among them, the thickness of the first pre-fixing film 33 being less than the thickness of the battery cell 31 is beneficial for the first pre-fixing film 33 to be bent relatively to form the extension portion 330 after lamination, which is beneficial for increasing the fixing effect of the first pre-fixing film 33, and at the same time, it can avoid the influence of the too thick first pre-fixing film 33 on the optical performance of the battery cell 31.

[0131] 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).

[0132] Among them, the cavity structure can be provided in the first extension portion 3311 of the extension portion 330, or can be provided in the second extension portion 3312 of the extension portion 330, or both the first extension portion 3311 and the second extension portion 3312 can be provided with the cavity structure. The cavity structure provided in the extension portion 330 can make the first adhesive film 2 and the second adhesive film 4 combine more firmly with the extension portion 330, can greatly increase the bonding force between the extension portion 330 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 structure provided in the extension portion 330 can play a buffering role, and can also reduce the stress of the extension portion 330 and avoid the fracture of the extension portion 330. Among them, the cavity structure can specifically be a hollow cavity or a cavity filled with air.

[0133] As an embodiment of the present invention, the thickness of at least a part of the first extension portion 3311 is greater than the thickness of the main body portion 336.

[0134] In this embodiment, it may be that only a part of the first extension portion 3311 has a thickness greater than the thickness of the main body portion 336, or it may be that the thickness of all regions of the first extension portion 3311 is greater than the thickness of the main body portion 336. Since at least a part of the first extension portion 3311 can have a thickness greater than the thickness of the main body 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, the breakage of the first extension portion 3311 can be avoided, which is beneficial to improving the performance of the first pre-fixing film 33; at the same time, the bonding force between the first extension portion 3311 and the first adhesive film 2 and the second adhesive film 4 can be increased, and the fixing effect of the first pre-fixing film 33 can be further enhanced.

[0135] Embodiment 4

[0136] Please refer to Figures 6 - 13 , as an embodiment of the present invention, the convex structure 335 can be disposed on the surface of the extension portion 330 close to the second adhesive film 4 or the surface of the extension portion 330 close to the first adhesive film 2, or can be disposed on the surface of the extension portion 330 close to the second adhesive film 4 and the surface of the extension portion 330 close to the first adhesive film 2 at the same time. The convex direction of the convex structure 335 on the extension portion 330 is not limited. The convex structure 335 can protrude toward the first adhesive film 2 or the second adhesive film 4. In addition, the convex structure 335 can also protrude toward the battery cell 31. Among them, the convex structure 335 can be strip-shaped, and the cross-section of the convex structure 335 is an arc-shaped protrusion, a serrated protrusion or other irregular-shaped protrusions.

[0137] As Figures 10 - 13 shown, as an embodiment of the present invention, the convex structure 335 is disposed on the surface of the extension portion 330 close to the second adhesive film 4, and the convex structure 335 is embedded in the second adhesive film 4.

[0138] In this embodiment, the convex structure 335 protrudes and is disposed on the surface of the extension portion 330 close to the second adhesive film 4, and the convex structure 335 is embedded in the second adhesive film 4 to form a fit, so that the bonding force between the extension portion 330 and the second adhesive film 4 can be improved, thereby improving the bonding force between the first pre-fixing film 33 and the second adhesive film 4, and further enhancing the fixing effect of the first pre-fixing film 33 on the welding strip 32.

[0139] As another embodiment of the present invention, the convex structure 335 is disposed on the surface of the extension portion 330 close to the first adhesive film 2, and the convex structure 335 is embedded in the first adhesive film 2.

[0140] In this embodiment, the convex structure 335 is embedded in the first adhesive film 2 to form a fit, so as to improve the bonding force between the epitaxial portion 330 and the first adhesive film 2, thereby improving the bonding force between the first pre-fixing film 33 and the first adhesive film 2, and also enhancing the fixing effect of the first pre-fixing film 33 on the solder strip 32.

[0141] As another embodiment of the present invention, the convex structure 335 is disposed on both the surface of the epitaxial portion 330 close to the second adhesive film 4 and the surface of the epitaxial portion 330 close to the first adhesive film 2. The convex structure 335 on the surface of the epitaxial portion 330 close to the second adhesive film 4 is embedded in the second adhesive film 4, and the convex structure 335 on the surface of the epitaxial portion 330 close to the first adhesive film 2 is embedded in the first adhesive film 2.

[0142] In this embodiment, the convex structure 335 can be disposed on both the surface of the epitaxial portion 330 close to the second adhesive film 4 and the surface of the epitaxial portion 330 close to the first adhesive film 2, which can improve the bonding force between the epitaxial portion 330 and the second adhesive film 4 and the bonding force between the epitaxial portion 330 and the first adhesive film 2 at the same time, thereby further improving the bonding force between the first pre-fixing film 33 and the second adhesive film 4 and the first adhesive film 2, and further enhancing the fixing effect of the first pre-fixing film 33 on the solder strip 32.

[0143] Specifically, the convex structure 335 can include a first convex structure 3351 disposed on the first epitaxial portion 331, a second convex structure 3352 disposed on the second epitaxial portion 332, a third convex structure 3353 disposed on the third epitaxial portion 333, and a fourth convex structure 3354 disposed on the fourth epitaxial portion 334. It can be understood that the convex structure 335 can be disposed on each of the first epitaxial portion 331, the second epitaxial portion 332, the third epitaxial portion 333, and the fourth epitaxial portion 334, or only one of the first epitaxial portion 331, the second epitaxial portion 332, the third epitaxial portion 333, and the fourth epitaxial portion 334 can be provided with the convex structure 335. Among them, the structures of the convex structures 335 on each epitaxial portion 330 are the same. Of course, in some other embodiments, the structures of the convex structures 335 on each epitaxial portion 330 can also be different.

[0144] As an embodiment of the present invention, the convex structure 335 includes a first convex structure 3351 disposed on the first epitaxial portion 331 and a second convex structure 3352 disposed on the second epitaxial portion 332, and the first convex structure 3351 and the second convex structure 3352 are respectively connected to the first adhesive film 2 and / or the second adhesive film 4.

[0145] In this embodiment, since the solder tape 32 extends along the first direction Y, and the first extension portion 331 and the second extension portion 332 are located at opposite ends of the main body portion 336 along the first direction Y, the first convex structure 3351 and the second convex structure 3352 are respectively arranged corresponding to the first extension portion 331 and the second extension portion 332. The first convex structure 3351 and the second convex structure 3352 can be used to increase the bonding force between the first extension portion 331 and the second extension portion 332 and the adhesive film, so as to well limit the movement of the solder tape 32 along the first direction Y, thereby improving the fixing effect of the first pre-fixing film 33 on the solder tape 32. Moreover, due to the existence of the first convex structure 3351 and the second convex structure 3352, the tensile force of the first pre-fixing film 33 along the first direction Y can be reduced, avoiding the fracture of the first pre-fixing film 33, and further improving the reliability of the first pre-fixing film 33 for fixing the solder tape 32.

[0146] As an embodiment of the present invention, the convex structure 335 further includes a third convex structure 3353 convexly arranged on the third extension portion 333 and a fourth convex structure 3354 convexly arranged on the fourth extension portion 334, and the third convex structure 3353 and the fourth convex structure 3354 are respectively connected to the first adhesive film 2 and / or the second adhesive film 4.

[0147] In this embodiment, since the third extension portion 333 and the fourth extension portion 334 are located at opposite ends of the main body portion 336 along the second direction X, the third convex structure 3353 and the fourth convex structure 3354 are respectively arranged corresponding to the third extension portion 333 and the fourth extension portion 334. The third convex structure 3353 and the fourth convex structure 3354 can be used to increase the bonding force between the third extension portion 333 and the fourth extension portion 334 and the adhesive film, so as to well limit the movement of the solder tape 32 along the second direction X, further improving the fixing effect of the first pre-fixing film 33 on the solder tape 32. Moreover, the third convex structure 3353 and the fourth convex structure 3354 can reduce the tensile force of the first pre-fixing film 33 along the second direction X, further improving the reliability of the first pre-fixing film 33 for fixing the solder tape 32.

[0148] Please refer to Figure 9, 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 protrusion structure 3351 is located between the first battery edge 311 and the first edge 3301 of the first pre-fixing film 33, the second protrusion structure 3352 is located between the second battery edge 312 and the second edge 3302 of the first pre-fixing film 33, the third protrusion 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 protrusion structure 3354 is located between the fourth battery edge 314 and the fourth edge 3304 of the first pre-fixing film 33. Each extension part 330 is connected to the first adhesive film 2 and / or the second adhesive film 4 by means of the protrusion structure 335 thereon, while further enhancing the bonding force between the first pre-fixing film 33 and the adhesive film, and strengthening the fixing effect of the first pre-fixing film 33; moreover, the protrusion structure 335 can reduce the tensile force of the extension part 330, improve the buffering effect, and prevent the extension part 330 from breaking.

[0149] As an embodiment of the present invention, the protrusion structure 335 is arranged on the first extension part 3311 or the second extension part 3312.

[0150] In this embodiment, when the protrusion structure 335 is arranged on the first extension part 3311 or the second extension part 3312, the protrusion structure 335 protrudes from the surface of the first extension part 3311 or the second extension part 3312, which is beneficial to increasing the bonding force between the position of the first extension part 3311 or the second extension part 3312 and the second adhesive film 4.

[0151] As an embodiment of the present invention, the protrusion structure 335 is arranged at the connection of the first extension part 3311 and the second extension part 3312.

[0152] In this embodiment, when the protrusion structure 335 is arranged at the connection of the first extension part 3311 and the second extension part 3312, the protrusion structure 335 protrudes from the surface at the connection of the first extension part 3311 and the second extension part 3312, which is beneficial to increasing the bonding force between the connection of the first extension part 3311 and the second extension part 3312 and the second adhesive film 4. Moreover, the presence of the protrusion structure 335 is also beneficial to increasing the buffering effect at the connection of the first extension part 3311 and the second extension part 3312, and avoiding breakage at the connection of the first extension part 3311 and the second extension part 3312. Among them, only the situation where the protrusion structure 335 is arranged at the connection of the first extension part 3311 and the second extension part 3312 is shown in the drawings of the present invention.

[0153] As an embodiment of the present invention, the distance from the edge of the battery cell 31 to the raised structure 335 is less than the distance from the edge of the battery cell 31 to the edge of the corresponding epitaxial portion 330, so that the raised structure 335 is located between the edge of the battery cell 31 and the edge of the epitaxial portion 330, which is beneficial to improving the bonding force between the first pre-fixing film 33 and the adhesive film and enhancing the fixing effect. Moreover, the raised structure 335 can reduce the pulling force of the epitaxial portion 330, improve the buffering effect, and prevent the epitaxial portion 330 from breaking.

[0154] As an embodiment of the present invention, the raised structure 335 is disposed on the surface of the epitaxial portion 330 close to the second adhesive film 4, and the surface of each raised structure 335 close to the second adhesive film 4 is set as a wavy surface.

[0155] In this embodiment, the surface of each raised structure 335 close to the second adhesive film 4 is set as a wavy surface. The wavy surface can further increase the bonding force between the raised structure 335 and the second adhesive film 4, further improve the fixing effect of the first pre-fixing film 33, and thus improve the fixing effect of the welding tape 32.

[0156] Among them, the surfaces of the first raised structure 3351, the second raised structure 3352, the third raised structure 3353 and the fourth raised structure 3354 away from the first adhesive film 2 are all set as wavy surfaces, which further improves the fixing effect of the first pre-fixing film 33.

[0157] Please refer to again Figure 9 , as an embodiment of the present invention, each raised structure 335 includes a first side edge 3356 disposed close to the battery cell 31 and a second side edge 3357 disposed away from the battery cell 31, and the first side edge 3356 and the second side edge 3357 are arranged in an unevenly connected manner.

[0158] In this embodiment, the first side edge 3356 and the second side edge 3357 of the raised structure 335 are in an unevenly connected wavy shape, which can further improve the bonding force between the raised 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.

[0159] As an embodiment of the present invention, the length of the first raised structure 3351 and the second raised structure 3352 in the second direction X is greater than or equal to the length of the battery cell 31 in the second direction X, which is beneficial to further improving the fixing effect of each welding tape 32.

[0160] As an embodiment of the present invention, the length of the third raised structure 3353 and the fourth raised structure 3354 in the first direction Y is greater than or equal to the length of the battery cell 31 in the first direction Y, which can further improve the fixing effect of the first pre-fixing film 33.

[0161] As an embodiment of the present invention, the projection lengths of the first convex structure 3351 and the second convex structure 3352 in the first direction Y are both 10 to 200 micrometers.

[0162] In this embodiment, by controlling the projection lengths of the first convex structure 3351 and the second convex structure 3352 in the second direction X to be 10 to 200 micrometers, good buffering effects of the first convex structure 3351 and the second convex structure 3352 can be ensured, fractures of the first epitaxial portion 331 and the second epitaxial portion 332 can be avoided, and at the same time, sufficient contact areas 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, so as to ensure appropriate bonding forces 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. In addition, the projection lengths of the third convex structure 3353 and the fourth convex structure 3354 in the second direction X are both 10 to 200 micrometers, so as to ensure appropriate bonding forces between the first pre-fixing film 33 and the first adhesive film 2 and the second adhesive film 4; moreover, the third convex structure 3353 and the fourth convex structure 3354 can play good buffering effects and good fixing effects with the adhesive film.

[0163] As an embodiment of the present invention, the convex structure 335 is arranged on the surface of the epitaxial portion 330 close to the second adhesive film 4, and a groove matching the convex structure 335 is formed at the position of the second adhesive film 4 corresponding to the convex structure 335, and the convex structure 335 is embedded in the groove.

[0164] 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.

[0165] Please refer to Figure 10 , as an embodiment of the present invention, a positioning groove formed by a depression is arranged on the surface of the first epitaxial portion 331 facing away from the convex structure 335, a positioning protrusion 22 is formed at the position of the first adhesive film 2 corresponding to the positioning groove, and the positioning protrusion 22 is embedded in the positioning groove.

[0166] In this embodiment, the positioning protrusion 22 is formed at the position of the first adhesive film 2 corresponding to the 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.

[0167] 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. The sum of the projection lengths of the first convex structure 3351 and the first extension portion 3311 of the first extension portion 331 in the first direction Y is 30 to 400 microns.

[0168] In this embodiment, the sum of the projection lengths of the first convex structure 3351 and the first extension portion 3311 of the first extension portion 331 in the first direction Y is 30 to 400 microns, which can ensure a good fixing effect of the first pre-fixing film 33 and is also conducive to the good fixing and limiting of the welding strip 32 extending outside the edge 311 of the first battery.

[0169] 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. The sum of the projection lengths of the second convex structure 3352 and the first extension portion 3311 of the second extension portion 332 in the first direction Y is 30 to 400 microns.

[0170] In this embodiment, the sum of the projection lengths of the second convex structure 3352 and the first extension portion 3311 of the second extension portion 332 in the first direction Y is 30 to 400 microns, which can ensure a good fixing effect of the first pre-fixing film 33 and also plays a good role in fixing and limiting the welding strip 32 extending outside the edge 312 of the second battery.

[0171] Embodiment Five

[0172] Please refer to again Figure 6 , as an embodiment of the present invention, the distance between two adjacent battery cells 31 in the battery string is L1, the projection length of the first extension portion 331 of the first pre-fixing film 33 in the first direction Y is S1, and the projection length of the second extension portion 332 of the first pre-fixing film 33 in the first direction Y is S2. The sum of S1 and S2 is less than L1.

[0173] In this embodiment, the sum of S1 and S2 is less than L1, which can prevent the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 of two adjacent battery cells 31 from overlapping, and can reduce the material cost of the first pre-fixing film 33.

[0174] As an embodiment of the present invention, the distance between two adjacent battery cells 31 in the battery string is L1. The projection lengths of the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 in the first direction Y are both less than L1 / 2, which can further ensure that the first pre-fixing films 33 on two adjacent battery cells 31 in the adjacent battery strings do not overlap. This can not only improve the fixing effect of the first pre-fixing film 33, but also reduce the material cost of the first pre-fixing film 33.

[0175] Embodiment Six

[0176] Please refer to Figure 3 and Figure 14 As an embodiment of the present invention, at least two adjacent first pre-fixed films 33 on each battery string are connected by the outer extension portions 330 of the first pre-fixed films 33 on at least two adjacent battery cells 31.

[0177] In this embodiment, since at least two adjacent first pre-fixed films 33 on the battery cells 31 overlap, the outer extension portions 330 of the first pre-fixed films 33 on one battery cell 31 are connected to the outer extension portions 330 of the first pre-fixed films 33 on the adjacent battery cell 31 to form an integral body, so that the adjacent first pre-fixed films 33 can also fix each other, which can further prevent the first pre-fixed film 33 from moving and improve the fixing effect of the first pre-fixed film 33.

[0178] As an embodiment of the present invention, the distance between two adjacent battery cells 31 in the battery string is L1, the projection length of the first outer extension portion 331 in the first direction Y is S1, and the projection length of the second outer extension portion 332 in the first direction Y is S2, and the sum of S1 and S2 is greater than or equal to L1.

[0179] In this embodiment, in each battery string, the first outer extension portion 331 and the second outer extension portion 332 of the first pre-fixed films 33 on two adjacent battery cells 31 are arranged adjacent to each other. When the sum of S1 and S2 is greater than L1, the first outer extension portion 331 and the second outer extension portion 332 between two adjacent battery cells 31 overlap and are connected to form an integral body, which is beneficial to further improving the fixing effect of the first pre-fixed film 33; when the sum of S1 and S2 is equal to L1, the first outer extension portion 331 and the second outer extension portion 332 of the first pre-fixed films 33 on two adjacent battery cells 31 are connected to form an integral body, which can also improve the fixing effect of the first pre-fixed film 33.

[0180] As an embodiment of the present invention, the distance between two adjacent battery cells 31 in each battery string is L1, and the projection lengths of the first outer extension portion 331 and the second outer extension portion 332 of the first pre-fixed film 33 on each battery string in the first direction Y are greater than or equal to L1 / 2.

[0181] In this embodiment, the projection lengths of the first outer extension portion 331 and the second outer extension portion 332 of the first pre-fixed film 33 on the battery cells 31 in each battery string in the first direction Y are greater than or equal to L1 / 2, which is convenient for the first pre-fixed films 33 on the adjacent battery cells 31 in the battery string to overlap, beneficial to improving the pre-fixing effect of the first pre-fixed films 33 in the battery string, making the fixing effect of the solder tape 32 in the whole battery string better, and improving the connection reliability of the battery string.

[0182] As an embodiment of the present invention, the epitaxial portions 330 of two adjacent first pre-fixed films 33 overlap and are connected to form a first overlapping portion 300, and the thickness D1 of the first overlapping portion 300 is greater than the thickness D2 of the main body portion 336.

[0183] In this embodiment, when the sum of S1 and S2 is greater than L1, the first epitaxial portion 331 and the second epitaxial portion 332 between two adjacent battery cells 31 overlap to form a first overlapping portion 300. By controlling the thickness of the first overlapping portion 300 to be greater than the thickness of the main body portion 336, it is beneficial to improve the structural strength of the overlapping position of the adjacent first pre-fixed films 33, so that the adjacent first pre-fixed films 33 are firmly connected, which is beneficial to further improve the fixing reliability of the first pre-fixed film 33 and improve the fixing performance of the welding strip 32.

[0184] As an embodiment of the present invention, the first overlapping portion 300 is provided with a cavity structure (not shown).

[0185] In this embodiment, since the first overlapping portion 300 is provided with a cavity structure, the first overlapping portion 300 has a loose structure. The cavity structure makes the first adhesive film 2 and the second adhesive film 4 bind more firmly to the first overlapping portion 300, which can greatly increase the binding force between the first overlapping portion 300 and the first adhesive film 2 and the second adhesive film 4, and improve the fixing effect of the first pre-fixed film 33. At the same time, the cavity structure provided in the first overlapping portion 300 can play a buffering role, reduce the stress of the first pre-fixed film 33, avoid the fracture of the first pre-fixed film 33, and make the combination between adjacent first pre-fixed films 33 more stable. Among them, the cavity structure can specifically be a hollow cavity or a cavity filled with air.

[0186] Embodiment Seven

[0187] Please refer to Figures 15 - 17 , as another embodiment of the present invention, the battery cell 31 includes a first grid line 317 provided on the first surface 315 and a second grid line 318 provided on the second surface 316, and the polarities of the first grid line 317 and the second grid line 318 are opposite;

[0188] 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.

[0189] In this embodiment, the solar cell 31 is a double-sided contact solar cell, and grid lines are provided on both the first surface 315 and the second surface 316 of the solar 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 lines 317 and the second grid lines 318 is a positive fine grid line, and the other is a negative fine grid line. For example, the first grid line 317 is a positive fine grid line, and the second grid line 318 is a negative fine grid line.

[0190] Among them, the first welding portion 321 of the welding tape 32 is located on the first surface 315 of one solar cell 31 and is connected to the first grid line 317 of this solar cell 31, and the second welding portion 322 of the welding tape 32 is located on the second surface 316 of another solar cell 31 and is connected to the second grid line 318 of this solar cell 31, realizing the series connection between adjacent solar cells 31.

[0191] Embodiment Eight

[0192] Please refer to Figures 17 - 19 , on the basis of Embodiment Seven, the solar cell module further includes:

[0193] A second pre-fixing film 36 located on the second surface 316, the second pre-fixing film 36 is disposed on the second welding portion 322 and fixedly connects the second welding portion 322 to the second surface 316, and the second pre-fixing film 36 does not extend beyond the edge of the solar cell 31.

[0194] In this embodiment, by providing the second pre-fixing film 36 on the second surface 316 of the solar cell 31, the second welding portion 322 of the welding tape 32 is fixed on the second surface 316 by using the second pre-fixing film 36, thereby realizing the fixation of the welding tape 32; at the same time, the second pre-fixing film 36 does not extend beyond the outside of the solar cell 31, that is, the second pre-fixing film 36 does not exceed the edge of the solar cell 31, avoiding the first extension portion 331 of the first pre-fixing film 33 from overlapping with the second pre-fixing film 36.

[0195] Among them, the material and thickness of the second pre-fixing film 36 may be the same as or different from those of the first pre-fixing film 33.

[0196] Embodiment Nine

[0197] Please refer to Figure 20 and Figure 21 , on the basis of Embodiment Seven, it further includes:

[0198] The second pre - fixing film 36 is located on the second surface 316. The second pre - fixing film 36 is disposed on the second welding portion 322 and fixedly connects the second welding portion 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 extension portion 361. The extension portion 361 is connected to the first adhesive film 2. 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 extension portion 330 on the plane where the second surface 316 is located.

[0199] In this embodiment, the cell 31 is a double - sided contact solar cell. The first pre - fixing film 33 extends from the position of the first cell edge 311 to the outside of the cell to form an extension portion 330. The extension portion 330 is used to improve the fixing stability of the first pre - fixing film 33, thereby improving the reliability of the solder tape 32 fixed on the first surface 315. The extension portion 361 is used to improve the fixing stability of the second pre - fixing film 36, thereby improving the reliability of the solder tape 32 fixed on the second surface 316, and further improving the structural reliability of the solar cell module.

[0200] 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 extension portion 330 on the plane where the second surface 316 is located, it is avoided that the extension portion 361 of the second pre - fixing film 36 overlaps with the extension portion 330 of the first pre - fixing film 33 after lamination; one side edge of the cell 31 provided with the extension portion 330 does not have the extension portion 361, and one side edge of the cell 31 provided with the extension portion 361 does not have the extension portion 330, realizing the staggered arrangement of the extension portion 361 of the second pre - fixing film 36 and the extension portion 330 of the first pre - fixing film 33, ensuring that the extension portion 361 and the extension portion 330 do not overlap, and avoiding the generation of bubbles due to the overlap of the extension portion 361 and the extension portion 330.

[0201] 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 or not. Of course, the second pre - fixing films 36 on two adjacent cells 31 can also not be connected.

[0202] As an embodiment of the present invention, the first pre-fixing film 33 includes a first extension portion 331 extending outward from the position of the first battery edge 311 to the outside of the battery sheet 31. The second pre-fixing film 36 includes an extension portion 361 extending outward from the position of the second battery edge 312 to the outside of the battery sheet 31. The first extension portions 331 between adjacent battery sheets 31 are arranged adjacent to each other, or the extension portions 361 between adjacent battery sheets 31 are arranged adjacent to each other. Among them, the first extension portions 331 between the battery sheets 31 may or may not overlap, and the extension portions 361 between the battery sheets 31 may or may not overlap.

[0203] Among them, the extension portions 330 of the first pre-fixing film 33 between adjacent battery sheets 31 may overlap to form a first overlapping portion 300, and the thickness D1 of the first overlapping portion 300 is greater than the thickness D2 of the main body portion 336; the extension portions 361 between adjacent battery sheets 31 may overlap to form a second overlapping portion 400, and the thickness D4 of the second overlapping portion 400 is greater than the thickness of the portion of the second pre-fixing film 36 covering the upper part of the second surface 316. Thus, the adjacent first pre-fixing films 33 are fixed and limited to each other, and the adjacent second pre-fixing films 36 are fixed and limited to each other, which can improve the reliability of fixing the welding tape 32 by the first pre-fixing film 33 and the second pre-fixing film 36.

[0204] Embodiment Ten

[0205] 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 convenient for the assembly of the solar cell module.

[0206] Please refer to Figure 22 As an embodiment of the present invention, the battery string includes a first battery sheet 3101 at its first end. The first battery sheet 3101 is connected to the edge bus bar 306. The distance between the first battery sheet 3101 and the edge bus bar 306 is L2. The first extension portion 331 of the first pre-fixing film 33 on the first battery sheet 3101 extends in the direction of the edge bus bar 306, and the projection length of the first extension portion 331 in the first direction Y is less than L2.

[0207] In this embodiment, the first extension portion 331 of the first pre-fixing film 33 on the first solar cell 3101 extends towards the edge bus bar 306. The projection length of the first extension portion 331 in the first direction Y is less than L2, preventing the first extension portion 331 of the first pre-fixing film 33 from completely covering the extended portion of the solder strip 32, ensuring good welding between the solder strip 32 and the edge bus bar 306, and the first extension portion 331 has a good fixing effect on the portion of the solder strip 32 extending beyond the edge of the first solar cell 3101.

[0208] As an embodiment of the present invention, the battery string includes a second solar cell 3102 at the second end. The second solar cell 3102 is connected to the middle bus bar 308, and the distance between the second solar cell 3102 and the middle bus bar 308 is L3. The second extension portion 332 of the first pre-fixing film 33 on the second solar cell 3102 extends towards the middle bus bar 308, and the projection length of the second extension portion 332 in the first direction Y is less than L3.

[0209] In this embodiment, the distance between the second solar cell 3102 and the middle bus bar 308 connected thereto is L3, and the projection length of the second extension portion 332 of the first pre-fixing film 33 on the second solar cell 3102 in the first direction Y is less than L3, preventing the second extension portion 332 of the first pre-fixing film 33 on the second solar cell 3102 from completely covering the extended portion of the solder strip 32, ensuring good welding between the extended portion of the solder strip 32 at the second end of the battery string and the middle bus bar 308, and the second extension portion 332 has a good fixing effect on the portion of the solder strip 32 extending beyond the edge of the second solar cell 3102.

[0210] As an embodiment of the present invention, 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 and the third extension portion 333 of the first pre-fixing film 33 on the second battery string 302 are arranged adjacent to each other, 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.

[0211] 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, not only can the fixing effect of the first pre-fixing film 33 be increased, but also the first pre-fixing film 33 on the solar cells 31 of the first battery string 301 does not overlap with the first pre-fixing film 33 on the solar cells 31 of the second battery string 302, which is beneficial to reducing the cost of the first pre-fixing film 33.

[0212] Embodiment XI

[0213] The embodiment of the present invention further provides a photovoltaic system, which includes the solar cell module of any of the above embodiments. 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.

[0214] 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 vehicle, 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 can 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 arrays are connected to the busbar box, and the busbar box can collect the current generated by the photovoltaic arrays. The collected 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.

[0215] In the description of this specification, the descriptions with reference to the terms "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean 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 a suitable manner in any one or more embodiments or examples.

[0216] 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 adhesive film, at least one battery string, a second adhesive film and a second cover plate which are sequentially stacked, the battery string comprising: A plurality of solar cells arranged at intervals along a first direction, the solar cells comprising a first surface and a second surface arranged opposite to each other; A plurality of welding tapes, adjacent two of the solar cells being connected by the welding tapes, the welding tapes extending along the first direction, the plurality of welding tapes being arranged at intervals along a second direction, the second direction intersecting with the first direction, the welding tapes comprising first welding portions arranged on the first surface; and A plurality of first pre-fixing films, each of the first pre-fixing films 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 adhesive film covering the first pre-fixing film; the first pre-fixing film comprising a main body portion covering the first surface, an extension portion connected to the main body portion and extending outside the edge of the solar cell, and a raised structure raised on the extension portion, the extension portion being connected to the first adhesive film and the second adhesive film, the raised structure being connected to the first adhesive film and / or the second adhesive film.

2. The solar cell module according to claim 1, wherein The raised structure is arranged on the surface of the extension portion close to the second adhesive film, and the raised structure is embedded in the second adhesive film.

3. The solar cell module according to claim 1, characterized in that, The raised structure is arranged on the surface of the extension portion close to the first adhesive film, and the raised structure is embedded in the first adhesive film.

4. The solar cell module according to claim 1, wherein The raised structure is simultaneously arranged on the surface of the extension portion close to the second adhesive film and the surface of the extension portion close to the first adhesive film, the raised structure on the surface of the extension portion close to the second adhesive film being embedded in the second adhesive film, and the raised structure on the surface of the extension portion close to the first adhesive film being embedded in the first adhesive film.

5. The solar cell module according to claim 1, wherein The solar cell comprises a first cell edge and a second cell edge arranged opposite to each other along the first direction; The extension portion comprises 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 along the first direction, the first extension portion covering the first cell edge and extending outside the first cell edge, and the second extension portion covering the second cell edge and extending outside the second cell edge.

6. The solar cell module according to claim 5, characterized in that, The raised structure comprises a first raised structure raised on the first extension portion and a second raised structure raised on the second extension portion, the first raised structure and the second raised structure being respectively connected to the first adhesive film and / or the second adhesive film.

7. The solar cell module according to claim 1 or 6, characterized in that, Each of the raised structures comprises a first side edge close to the solar cell and a second side edge far from the solar cell, the first side edge and the second side edge being arranged in an uneven connection.

8. The solar cell module according to claim 2, wherein, The surface of the raised structure close to the second adhesive film is arranged as a wavy surface.

9. The solar cell module according to claim 6, characterized in that, The projection length of the first raised structure and the second raised structure along the second direction is greater than or equal to the length of the solar cell along the second direction.

10. The solar cell module according to claim 1, wherein The cell includes a third cell edge and a fourth cell edge that are oppositely disposed along the second direction; the epitaxial portion includes a third epitaxial portion and a fourth epitaxial portion that are respectively connected to opposite ends of the main body portion along the second direction, the third epitaxial portion covers the third cell edge and extends outside the third cell edge, and the fourth epitaxial portion covers the fourth cell edge and extends outside the fourth cell edge.

11. The solar cell module according to claim 10, characterized in that, The raised structure further includes a third raised structure that is raised on the third epitaxial portion and a fourth raised structure that is raised on the fourth epitaxial portion, and the third raised structure and the fourth raised structure are respectively connected to the first adhesive film and / or the second adhesive film.

12. The solar cell module according to claim 1, characterized in that, The raised structure is disposed on the surface of the epitaxial portion close to the second adhesive film, and a groove matching the raised structure is formed at a position of the second adhesive film corresponding to the raised structure, and the raised structure is embedded in the groove.

13. The solar cell module according to claim 12, wherein A positioning groove formed by a depression is disposed on a surface of the first epitaxial portion facing away from the raised structure, and a positioning protrusion is formed at a position of the first adhesive film corresponding to the positioning groove, and the positioning protrusion is embedded in the positioning groove.

14. The solar cell module according to claim 6, wherein The projection lengths of the first raised structure and the second raised structure in the first direction are both 10 to 200 micrometers.

15. The solar cell module according to claim 11, wherein The projection lengths of the third raised structure and the fourth raised structure in the second direction are both 10 to 200 micrometers.

16. The solar cell module according to claim 1, wherein, The cell includes a side surface connecting the first surface and the second surface, and the epitaxial portion surrounds at least a partial area of the side surface.

17. The solar cell module according to claim 1, wherein, 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 ribbon includes two of the first welding portions and a connecting portion connecting the two first welding portions, one of the first welding portions 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.

18. The solar cell module according to claim 1, characterized in that, The cell includes a first grid line disposed on the first surface and a second grid line disposed on the second surface, and the polarities of the first grid line and the second grid line are opposite; The solder ribbon further includes a second welding portion and a connecting portion, the connecting portion connects the first welding portion and the second welding portion, the first welding portion is disposed on the first surface and is connected to the first grid line, and the second welding portion is disposed on the second surface and is connected to the second grid line.

19. The solar cell module according to claim 1, characterized in that, 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.

20. A photovoltaic system, characterized in that, A solar cell module includes any one of claims 1 to 19.

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