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 a plurality of cell pieces, and each cell 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, a second welding part arranged on the second surface and a connecting part; the plurality of first pre-fixing films are arranged on the first welding part and fixed on the first surface in a covering manner; the plurality of second pre-fixing films are arranged on the second welding part and fixed on the second surface in a covering manner; and at least one of the first pre-fixing film and the second pre-fixing film extends to the outer side of the edge of the battery piece and is connected with the first adhesive film and the second adhesive film. According to the solar cell module, the fixing effect of the pre-fixing film on the welding strip can be improved, and the reliability of the solar cell module is improved.

Description

Technical Field

[0001] 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, and the conversion efficiency has been continuously increased. 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. However, after laminating the cell module, due to the thermal shrinkage effect, the size of the pre-fixing film is usually smaller than the size of the cell wafer, and the pre-fixing film does not extend beyond the edge position of the cell wafer, so the pre-fixing film is not firmly fixed, resulting in the solder tape not being firmly fixed and 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 implemented as follows. A solar cell module is provided, which 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 arranged opposite to each other;

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

[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 covers and is fixed to the first surface, and the second adhesive film covers the first pre-fixing film; and

[0009] A plurality of second pre-fixing films, each of the second pre-fixing films is disposed on a corresponding solar cell, the second pre-fixing film is disposed on the second welding portion and covers and is fixed to the second surface, and the first adhesive film covers the second pre-fixing film; at least one of the first pre-fixing film and the second pre-fixing film extends to the outside of the edge of the solar cell and is connected to the first adhesive film and the second adhesive film.

[0010] Preferably, the first pre-fixing film extends to the outside of the edge of the solar cell and is connected to the first adhesive film and the second adhesive film, and the second pre-fixing film does not extend to the outside of the edge of the solar cell.

[0011] Preferably, the first pre-fixing film includes a first main body portion covering the first surface and at least one extension portion connected to the first main body portion and extending to the outside of the edge of the solar cell, and the extension portion is connected to the first adhesive film and the second adhesive film.

[0012] Preferably, the second pre-fixing film includes a second main body portion covering the second surface and at least one extension part connected to the second main body portion and extending to the outside of the edge of the solar cell.

[0013] Preferably, the projection of the extension part on the plane where the first surface is located does not overlap with the projection of the extension portion.

[0014] Preferably, the solar cell includes a first cell edge and a second cell edge oppositely disposed along the first direction; the extension portion includes a first extension portion and a second extension portion respectively disposed at opposite ends of the first main body portion along the first direction, the first extension portion covers the first cell edge and extends to the outside of the first cell edge along the first direction, and the second extension portion covers the second cell edge and extends to the outside of the second cell edge along the first direction.

[0015] Preferably, the solar cell includes a third cell edge and a fourth cell edge oppositely disposed along the second direction, the extension portion includes a third extension portion and a fourth extension portion respectively connected to opposite ends of the first main body portion along the second direction, the third extension portion covers the third cell edge and extends to the outside of the third cell edge along the second direction, and the fourth extension portion covers the fourth cell edge and extends to the outside of the fourth cell edge along the second direction.

[0016] Preferably, the first extension parts and the second extension parts of two adjacent first pre-fixing films of the battery string are connected to each other.

[0017] Preferably, the battery cell includes a first battery edge and a second battery edge oppositely arranged along the first direction; the extension part includes a first extension part connected to one end of the first main body part, and the first extension part covers the first battery edge and extends outside the first battery edge;

[0018] The extension part is connected to one end of the second main body part, the extension part covers the second battery edge and extends outside the second battery edge, the first extension parts of two adjacent first pre-fixing films of the battery string are arranged adjacent to each other, and the extension parts of two adjacent second pre-fixing films of the battery string are arranged adjacent to each other.

[0019] Preferably, the first extension parts of two adjacent first pre-fixing films of the battery string are connected to each other.

[0020] Preferably, the first extension parts of two adjacent first pre-fixing films in the battery string are overlapped and connected to form a first overlapping part, and the thickness of the first overlapping part is greater than the thickness of the first main body part.

[0021] Preferably, the extension parts of two adjacent second pre-fixing films of the battery string are connected to each other.

[0022] Preferably, the extension parts of two adjacent second pre-fixing films in the battery string are overlapped and connected to form a second overlapping part, and the thickness of the second overlapping part is greater than the thickness of the second main body part.

[0023] Preferably, the first overlapping part is provided with a first cavity structure.

[0024] Preferably, the second overlapping part is provided with a second cavity structure.

[0025] Preferably, at least a part of the extension part is bent towards the plane where the second surface is located relative to the first main body part.

[0026] Preferably, the battery cell includes a first grid line arranged on the first surface and a second grid line arranged on the second surface, the polarities of the first grid line and the second grid line are opposite, the first welding part is connected to the first grid line on one battery cell, and the second welding part is connected to the second grid line on the other battery cell.

[0027] Preferably, both the first pre-fixing film and the second pre-fixing film include at least one of a PVB film, an EVA film, an EPE film, an EP film, and a POE film.

[0028] The present invention also provides a photovoltaic system, including the above-mentioned solar cell module.

[0029] A solar cell module provided by the present invention fixes the first welding part of the welding tape on the first surface by arranging a first pre-fixing film on the first surface of the cell, fixes the second welding part of the welding tape on the second surface by arranging a second pre-fixing film on the second surface of the cell, and at least one of the first pre-fixing film and the second pre-fixing film extends outside the edge of the cell and is connected to the first adhesive film and the second adhesive film, which is beneficial to increasing the bonding force between at least one of the first pre-fixing film and the second pre-fixing film and the first adhesive film and the second adhesive film, thereby greatly improving the fixing effect of at least one of the first pre-fixing film and the second pre-fixing film, and further improving the reliability of fixing the welding tape on the cell by the first pre-fixing film and the second pre-fixing film, which is beneficial to improving the structural reliability of the solar cell module. Description of the Drawings

[0030] Figure 1 It is a schematic plan view of a solar cell module provided by an embodiment of the present invention;

[0031] Figure 2 It is a schematic plan view of the connection of the welding tape of the cells of a battery string of a solar cell module provided by an embodiment of the present invention;

[0032] Figure 3 It is another schematic plan view of the connection of the welding tape of the cells of a battery string of a solar cell module provided by an embodiment of the present invention;

[0033] Figure 4 It is a schematic cross-sectional view of the connection of the welding tape of adjacent cells of a battery string of a solar cell module provided by an embodiment of the present invention;

[0034] Figure 5 It is a schematic plan view of a solar cell module provided by an embodiment of the present invention after the cell is covered with the first pre-fixing film;

[0035] Figure 6 It is a schematic cross-sectional view of a solar cell module provided by an embodiment of the present invention along a first direction;

[0036] Figure 7 It is another schematic cross-sectional view of a solar cell module provided by an embodiment of the present invention along a first direction;

[0037] Figure 8 It is a schematic cross-sectional view of another solar cell module provided by an embodiment of the present invention along a first direction;

[0038] Figure 9Another schematic cross-sectional view of the solar cell module provided by the embodiment of the present invention along the first direction. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and cannot be construed as a limitation to the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "back", "front", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0041] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0042] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such 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.

[0043] A solar cell module provided by the present invention fixes the first welding part of the welding ribbon on the first surface by means of a first pre-fixing film provided on the first surface of the cell, and fixes the second welding part of the welding ribbon on the second surface by means of a second pre-fixing film provided on the second surface of the cell. At least one of the first pre-fixing film and the second pre-fixing film extends outside the edge of the cell and is connected to the first encapsulant film and the second encapsulant film, thereby increasing the contact area between at least one of the first pre-fixing film and the second pre-fixing film and the first encapsulant film and the second encapsulant film, increasing the bonding force between at least one of the first pre-fixing film and the second pre-fixing film and the first encapsulant film and the second encapsulant film, enhancing the fixing effect of at least one of the first pre-fixing film and the second pre-fixing film, and further improving the reliability of fixing the welding ribbon on the cell by the first pre-fixing film and the second pre-fixing film, which is beneficial to improving the structural reliability of the solar cell module.

[0044] Embodiment 1

[0045] Please refer to Figures 1-7 , 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 cell string, a second encapsulant film 4 and a second cover plate 5 which are sequentially stacked. The cell string includes:

[0046] A plurality of cells 31 which are sequentially arranged at intervals along the first direction Y. The cell 31 includes a first surface 315 and a second surface 316 which are oppositely arranged;

[0047] A plurality of welding ribbons 32. Adjacent two cells 31 are connected by the welding ribbon 32. The welding ribbon 32 extends along the first direction Y. The plurality of welding ribbons 32 are arranged at intervals along the second direction X. The second direction X intersects with the first direction Y. The welding ribbon 32 includes a first welding part 321 provided on the first surface 315, a second welding part 322 provided on the second surface 316, and a connecting part 320 connecting the first welding part 321 and the second welding part 322; and

[0048] A first pre-fixing film 33. Each first pre-fixing film 33 is provided on the corresponding cell. The first pre-fixing film 33 is provided on the first welding part 321 and covers and fixes on the first surface 315. The second encapsulant film 4 covers the first pre-fixing film 33; and

[0049] A second pre-fixing film 36. Each second pre-fixing film 36 is provided on the corresponding cell 31. The second pre-fixing film 36 is provided on the second welding part 322 and covers and fixes on the second surface 316. The first encapsulant film 2 covers the second pre-fixing film 36; wherein, at least one of the first pre-fixing film 33 and the second pre-fixing film 36 extends outside the edge of the cell 31 and is connected to the first encapsulant film 2 and the second encapsulant film 4.

[0050] In an embodiment of the present invention, the solar cell module includes at least one battery string. When the solar cell module includes multiple battery strings, the multiple battery strings can be arranged in multiple rows and columns. The cells 31 within each battery string are connected in series through solder tapes 32, and different battery strings can be connected in series or in parallel through busbars to achieve current collection and output. The multiple battery strings can form a cell array and are encapsulated together with a first cover plate 1, a first encapsulant film 2, a second encapsulant film 4, and a second cover plate 5 to form a solar cell module.

[0051] 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:

[0052] A first battery string 301 and a second battery string 302 spaced apart along the second direction X;

[0053] A third battery string 303 and a fourth battery string 304 spaced apart along the second direction X, the first battery string 301 and the third battery string 303 are arranged along the first direction Y, and the second battery string 302 and the fourth battery string 304 are arranged along the first direction Y.

[0054] Wherein, the first battery string 301 and the second battery string 302 are connected in series, the third battery string 303 and the fourth battery string 304 are connected in series, the first battery string 301 and the third battery string 303 are connected in parallel, and the second battery string 302 and the fourth battery string 304 are connected in parallel. The second battery string 302 of each battery string unit 30 is adjacent to and connected in series with the first battery string 301 of an adjacent battery string unit 30, and the fourth battery string 304 of each battery string unit 30 is adjacent to and connected in series with the third battery string 303 of an adjacent battery string unit 30.

[0055] Specifically, one end of the first battery string 301 and the second battery string 302 of each battery string unit 30 is connected in series through an edge busbar 306, the third battery string 303 and the fourth battery string 304 are also connected in series through an edge busbar 306, the first battery string 301 and the third battery string 303 are connected in parallel through an intermediate busbar 308, the second battery string 302 and the fourth battery string 304 are connected in parallel through an intermediate busbar 308, the second battery string 302 of the battery string unit 30 is connected in series with the first battery string 301 of an adjacent battery string unit 30 through an intermediate busbar 308, and the fourth battery string 304 of each battery string unit 30 is connected in series with the third battery string 303 of an adjacent battery string unit 30 through an intermediate busbar 308. Of course, other connection methods can also be used to achieve the series and parallel connections between the battery strings.

[0056] Wherein, Figure 1Only three battery string units 30 are schematically shown, and the battery string units 30 are arranged at intervals in sequence along the second direction X. Each battery string unit 30 includes the above-mentioned first battery string 301, second battery string 302, third battery string 303, and fourth battery string 304.

[0057] In an embodiment of the present invention, a provided solar cell module fixes the first welding portion 321 of the welding tape 32 on the first surface 315 by using a first pre-fixing film 33 provided on the first surface 315 of the battery cell 31, and fixes the second welding portion 322 of the welding tape 32 on the second surface 316 by using a second pre-fixing film 36 provided on the second surface 316 of the battery cell 31. And at least one of the first pre-fixing film 33 and the second pre-fixing film 36 extends outside the edge of the battery cell 31 and is connected to the first adhesive film 2 and the second adhesive film 4, so as to increase the contact area between at least one of the first pre-fixing film 33 and the second pre-fixing film 36 and the first adhesive film 2 and the second adhesive film 4, increase the bonding force between at least one of the first pre-fixing film 33 and the second pre-fixing film 36 and the first adhesive film 2 and the second adhesive film 4, improve the fixing effect of at least one of the first pre-fixing film 33 and the second pre-fixing film 36, and further improve the reliability of the fixing of the welding tape 32 by the first pre-fixing film 33 and the second pre-fixing film 36, and improve the structural reliability of the solar cell module.

[0058] In an embodiment of the present invention, one of the first surface 315 and the second surface 316 of the battery cell 31 is a light-facing surface, and the other is a backlight-facing surface. The battery cell 31 is a double-sided contact solar cell. Both the first surface 315 and the second surface 316 of the battery cell 31 have grid lines. For example, the battery cell 31 can be a Topcon solar cell.

[0059] In an 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.

[0060] In an embodiment of the present invention, each battery string includes a plurality of welding tapes 32, and the specific number of the welding tapes 32 in each battery string is not limited, and the specific number of the welding tapes 32 can be flexibly set according to actual applications. Specifically, each welding tape 32 extends along the first direction Y, that is, the length direction of the welding tape 32 is the first direction Y, and the welding tapes 32 are arranged at intervals in sequence along the second direction X.

[0061] Embodiment Two

[0062] Please refer to Figures 2-4, as an embodiment of the present invention, the solar cell 31 includes a first grid line 317 disposed on the first surface 315 and a second grid line 318 disposed on the second surface 316, and the polarities of the first grid line 317 and the second grid line 318 are opposite; the first welding portion 321 is connected to the first grid line 317 on one solar cell 31, and the second welding portion 322 is connected to the second grid line 318 on another solar cell 31.

[0063] In this embodiment, the solar cell 31 is a double-sided contact solar cell, and grid lines are disposed on both the first surface 315 and the second surface 316 of the 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 line 317 and the second grid line 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.

[0064] For two adjacent solar cells 31 in each solar cell string, the first welding portion 321 of the welding strip 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 strip 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.

[0065] In this embodiment, the first pre-fixing film 33 is used to fix the first welding portion 321 of the welding strip 32 on the first surface 315, and the second pre-fixing film 36 is used to fix the second welding portion 322 of the welding strip 32 on the second surface 316, realizing the fixation of the welding strip 32.

[0066] Embodiment Three

[0067] Please refer to Figures 5-7 , as an embodiment of the present invention, the first pre-fixing film 33 extends to the outside of the edge of the solar cell 31 and is connected to the first adhesive film 2 and the second adhesive film 4, and the second pre-fixing film 36 does not extend to the outside of the edge of the solar cell 31.

[0068] In this embodiment, only the first pre-fixing film 33 extends to the outside of the edge of the solar cell 31 and is connected to the first adhesive film 2 and the second adhesive film 4, while the second pre-fixing film 36 does not extend to the outside of the edge of the solar cell 31, which can improve the fixing effect of the first pre-fixing film 33; at the same time, the second pre-fixing film 36 does not extend outside the solar cell 31, that is, the second pre-fixing film 36 does not exceed the edge of the solar cell 31, avoiding the overlapping of the first pre-fixing film 33 and the second pre-fixing film 36 to generate bubbles.

[0069] 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.

[0070] Example 4

[0071] Please refer to Figures 5-7 , as an embodiment of the present invention, the first pre-fixing film 33 includes a first main body portion 336 covering the first surface 315, and at least one extension portion 330 connected to the first main body portion 336 and extending outside the edge of the battery cell 31. The extension portion 330 is connected to the first adhesive film 2 and the second adhesive film 4.

[0072] Among them, the first main body portion 336 completely covers the first surface 315, that is, the size of the first main body portion 336 is the same as the size of the battery cell 31, so that the first welding portion 321 of the welding tape 32 is stably fixed on the first surface 315 of the battery cell 31.

[0073] In the embodiment of the present invention, the number of the first pre-fixing films 33 is adapted to the number of the battery cells 31. One first pre-fixing film 33 is correspondingly arranged on each battery cell 31, which is convenient for fixing the first welding portion 321 of the welding tape 32 on each battery cell 31 and is also convenient for 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 battery edge of the battery cell 31, or an extension portion 330 may be formed at each battery edge of the battery cell 31. Among them, the extension portion 330 is specifically the part of the first pre-fixing film 33 that extends beyond the edge of the battery cell 31. In the embodiment of the present invention, the number of the second pre-fixing films 36 is adapted to the number of the battery cells 31. One second pre-fixing film 36 is correspondingly arranged on each battery cell 31, which is convenient for fixing the second welding portion 322 of the welding tape 32 on each battery cell 31 and is also convenient for the film covering process of the second pre-fixing film 36.

[0074] In this embodiment, the first pre-fixing film 33 is arranged to include a first main body portion 336 and an extension portion 330 connected to the first main body portion 336 and extending outside the battery cell 31. On the premise that the first pre-fixing film 33 is fixedly connected to the first surface 315 by using the first main body portion 336, the extension portion 330 is simultaneously connected to the first adhesive film 2, so that the first pre-fixing film 33 is fixed more firmly, thereby improving the fixing effect of the first pre-fixing film 33 on the welding tape 32. 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.

[0075] As an embodiment of the present invention, the extension portion 330 is bent relative to the first main body portion 336 in a direction approaching the plane where the second surface 316 is located. The bent extension portion 330 forms a limiting and cooperating structure with the battery cell 31, which can effectively prevent the first pre-fixing film 33 from loosening and shifting, so that the extension portion 330 is stably fixed on the battery cell 31. At the same time, the extension portion 330 also forms a limiting and cooperating structure with the first adhesive film 2 and the second adhesive film 4, which is beneficial to increasing the bonding force between the extension portion 330 and the first adhesive film 2 and the second adhesive film 4, and can effectively prevent the first pre-fixing film 33 from loosening, greatly improving the fixing reliability of the first pre-fixing film 33 to the welding tape 32.

[0076] Please refer to Figure 5 , in the embodiment of the present invention, the battery cell 31 includes a first battery edge 311 and a second battery edge 312 oppositely arranged along the first direction Y, and a third battery edge 313 and a fourth battery edge 314 oppositely arranged along the second direction X.

[0077] Among them, the extension portion 330 may include a first extension portion 331 connected to the first main body portion 336 and extending along the first direction Y to the outside of the first battery edge 311, a second extension portion 332 connected to the first main body portion 336 and extending along the first direction Y to the outside of the second battery edge 312, a third extension portion 333 connected to the first main body portion 336 and extending along the second direction X to the outside of the third battery edge 313, and a fourth extension portion 334 connected to the first main body portion 336 and extending along the second direction X to the outside of the fourth battery edge 314. Among them, the extension portion 330 includes at least one of the first extension portion 331, the second extension portion 332, the third extension portion 333, and the fourth extension portion 334.

[0078] As an embodiment of the present invention, the battery cell 31 includes a first battery edge 311 and a second battery edge 312 oppositely arranged along the first direction Y;

[0079] The extension portion 330 includes a first extension portion 331 and a second extension portion 332. The first extension portion 331 and the second extension portion 332 are respectively arranged at opposite ends of the first main body portion 336 along the first direction Y. The first extension portion 331 covers the first battery edge 311 and extends along the first direction Y to the outside of the first battery edge 311, and the second extension portion 332 covers the second battery edge 312 and extends along the first direction Y to the outside of the second battery edge 312.

[0080] In this embodiment, the welding ribbon 32 extends along the first direction Y, and at least some of the welding ribbons 32 extend outside the first battery edge 311. At least some of the welding ribbons 32 extend along the first direction Y outside the second battery edge 312. The first extension portion 331 is used to cover the position of the first battery edge 311 of the welding ribbon 32 extending outside the first battery edge 311. The first extension portion 331 surrounds the position of the first battery edge 311 of the welding ribbon 32, making it difficult for the welding ribbon 32 to shift in position at the position of the first battery edge 311. At the same time, the second extension portion 332 is used to cover the position of the second battery edge 312 of the welding ribbon 32 extending outside the second battery edge 312. The second extension portion 332 surrounds the position of the second battery edge 311 of the welding ribbon 32, making it difficult for the welding ribbon 32 to shift in position at the edge position of the second battery cell 31. This can greatly improve the fixing stability of the welding ribbon 32 at the position of the first battery edge 311 and the position of 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 ribbon 32 extends beyond the first battery edge 311 is covered and fixed by the first extension portion 331, and at least a part of the area where the welding ribbon 32 extends beyond the second battery edge 312 is covered and fixed by the second extension portion 332, preventing the welding ribbon 32 from loosening at the positions of the first battery edge 311 and the second battery edge 312, thereby improving the fixing effect of the welding ribbon 32 at the positions of the first battery edge 311 and the second battery edge 312.

[0081] As an embodiment of the present invention, the battery cell 31 further includes a third battery edge 313 and a fourth battery edge 314 that are oppositely arranged along the second direction X. The extension portion 330 includes a third extension portion 333 and a fourth extension portion 334. The third extension portion 333 and the fourth extension portion 334 are respectively connected to opposite ends of the first main body portion 336 along the second direction X. The third extension portion 333 covers the third battery edge 313 and extends outside the third battery edge 313 along the second direction X. The fourth extension portion 334 covers the fourth battery edge 314 and extends outside the fourth battery edge 314 along the second direction X.

[0082] In this embodiment, the first pre-fixing film 33 is connected to the first adhesive film 2 and the second adhesive film 4 respectively by using the third extension portion 333 and the fourth extension portion 334 distributed along the second direction X, realizing the limit fixing of the first pre-fixing film 33 in both the first direction Y and the second direction X at the same time. This can further improve the fixing effect of the first pre-fixing film 33, further improve the fixing stability of the welding ribbon 32, and improve the reliability of the solar cell module.

[0083] Among them, the structures of the extension portions 330 are the same, that is, the structures of the first extension portion 331, the second extension portion 332, the third extension portion 333, and the fourth extension portion 334 are the same. Of course, in some possible embodiments, the structures of the extension portions 330 may also be different.

[0084] As an embodiment of the present invention, both the first pre-fixing film 33 and the second pre-fixing film 36 include at least one of a PVB film, an EVA film, an EPE film, an EP film, and a POE film.

[0085] Among them, the materials of the first pre-fixing film 33 and the second pre-fixing film 36 can be one of a PVB film, an EVA film, an EPE film, an EP film, and a POE film, or can 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).

[0086] 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 materials of the first pre-fixing film 33 and the second pre-fixing film 36 can be the same or different.

[0087] Embodiment Five

[0088] Please refer to again Figures 6-7 , as an embodiment of the present invention, the distance between two adjacent solar cells 31 in the battery string is L1, and the sum of the projection lengths of the first extension portion 331 of the first pre-fixing film 33 and the second extension portion 332 of the first pre-fixing film 33 in the first direction Y is less than L1, which can avoid the intersection of the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 of two adjacent solar cells 31, and can reduce the material cost of the first pre-fixing film 33.

[0089] As an embodiment of the present invention, 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 solar cells 31 in the adjacent battery strings do not overlap.

[0090] In this embodiment, since 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, the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 on two adjacent solar cells 31 do not overlap, which 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.

[0091] As Figure 7As shown, as an embodiment of the present invention, the extension portions 330 of the first pre-fixing films 33 on at least two adjacent solar cells 31 in each solar cell string are connected to each other.

[0092] In this embodiment, since the first pre-fixing films 33 on at least two adjacent solar cells 31 overlap each other, the extension portions 330 of the first pre-fixing films 33 on one solar cell are connected to the extension portions 330 of the first pre-fixing films 33 on the adjacent solar cells 31 to form a whole, so that the adjacent first pre-fixing films 33 can also fix each other, which can further prevent the first pre-fixing films 33 from moving in the first direction Y and improve the fixing effect of the first pre-fixing films 33.

[0093] As an embodiment of the present invention, the distance between two adjacent solar cells 31 in the solar cell string is L1, and the sum of 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 is greater than or equal to L1.

[0094] In this embodiment, in each solar cell string, the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 on two adjacent solar cells 31 are arranged adjacent to each other. When the sum of 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 is greater than L1, the first extension portion 331 and the second extension portion 332 between two adjacent solar cells 31 overlap and are connected to form a whole, which is beneficial to further improving the fixing effect of the first pre-fixing film 33; when the sum of 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 is equal to L1, the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 on two adjacent solar cells 31 are connected end to end to form a whole, which can also improve the fixing effect of the first pre-fixing film 33.

[0095] As an embodiment of the present invention, the distance between two adjacent solar cells 31 in each solar cell string is L1, and the projection lengths of the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 on each solar cell string in the first direction Y are greater than or equal to L1 / 2.

[0096] In this embodiment, the projection lengths of the first extension portion 331 and the second extension portion 332 of the first pre-fixing film 33 on the solar cells 31 in each solar cell string in the first direction Y are greater than or equal to L1 / 2, which is convenient for the first pre-fixing films 33 on the adjacent solar cells 31 in the solar cell string to be connected, beneficial to improving the pre-fixing effect of the first pre-fixing films 33 in the solar cell string, making the fixing effect of the solder tapes 32 in the whole solar cell string better, and improving the connection reliability of the solar cell string.

[0097] As Figure 7As shown in the figure, as an embodiment of the present invention, the extension parts 330 of two adjacent first pre-fixing films 33 overlap and are connected to form a first overlapping part 300, and the thickness D1 of the first overlapping part 300 is greater than the thickness D2 of the first main body part 336.

[0098] Among them, the first extension part 331 and the second extension part 332 between two adjacent battery chips 31 overlap to form a first overlapping part 300. By controlling the thickness D1 of the first overlapping part 300 to be greater than the thickness D2 of the first main body part 336, it is beneficial to improve the structural strength of the overlapping position of two adjacent first pre-fixing films 33, make the connection between two adjacent first pre-fixing films 33 stable, and is beneficial to further improve the fixing reliability of the first pre-fixing film 33 and the fixing performance of the welding strip 32.

[0099] Embodiment Six

[0100] Please refer to Figure 8 and Figure 9 , as an embodiment of the present invention, the second pre-fixing film 36 includes a second main body part 360 covering the second surface 316 and at least one extension part 361 connected to the second main body part 360 and extending outside the edge of the battery chip 31.

[0101] In the embodiment of the present invention, a first pre-fixing film 36 is correspondingly arranged on the second surface 316 of each battery chip 31, which is convenient for the film covering process of the second pre-fixing film 36. Each second pre-fixing film 33 forms an extension part 361 at at least one battery edge of the battery chip 31, or an extension part 361 can also be formed at each battery edge of the battery chip 31. Among them, the extension part 361 is specifically the part where the second pre-fixing film 36 extends beyond the edge of the battery chip 31.

[0102] In this embodiment, the second pre-fixing film 36 extends to the outside of the edge of the battery chip 31 to form an extension part 361. The extension part 361 is used to improve the fixing stability of the second pre-fixing film 36, thereby improving the reliability of the welding strip 32 fixed on the second surface 316 and further improving the structural reliability of the solar cell module.

[0103] As an embodiment of the present invention, the projection of the extension part 361 and the extension part 330 on the plane where the first surface 315 is located do not overlap.

[0104] In this embodiment, since the projection area of the extension part 361 on the plane where the first surface 315 is located does not overlap with the projection area of the extension part 330 on the plane where the first surface 315 is located, after lamination, the extension part 361 and the extension part 330 do not overlap, avoiding the formation of bubbles due to the overlap of the extension part 361 of the second pre-fixing film 36 and the extension part 330 of the first pre-fixing film 33. Among them, one side edge of the battery cell 31 where the extension part 330 is provided does not have the extension part 361, and one side edge of the battery cell 31 where the extension part 361 is provided does not have the extension part 330, realizing the dislocation arrangement of the extension part 361 of the second pre-fixing film 36 and the extension part 330 of the first pre-fixing film 33, ensuring that the extension part 361 and the extension part 330 do not overlap, and avoiding the formation of bubbles due to the overlap of the extension part 361 and the extension part 330.

[0105] As an embodiment of the present invention, the first pre-fixing films 33 on two adjacent battery 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 battery cells 31 can also not be connected; the second pre-fixing films 36 on two adjacent battery cells 31 can be connected to each other to improve the fixing effect of the second pre-fixing film 36. Of course, the second pre-fixing films 36 on two adjacent battery cells 31 can also not be connected.

[0106] Please refer to Figure 8 and Figure 9 , as an embodiment of the present invention, the battery cell 31 includes a first battery edge 311 and a second battery edge 312 that are oppositely arranged along the first direction Y; the extension part 330 is provided at one end of the first main body part 336 close to the first battery edge 311, and the extension part 330 covers the first battery edge 311 and extends to the outside of the first battery edge 311;

[0107] The extension part 361 is provided at one end of the second main body part 360 close to the second battery edge 312, and the extension part 361 covers the second battery edge 312 and extends to the outside of the second battery edge 312. The extension parts 330 of two adjacent first pre-fixing films 33 in the battery string are arranged adjacent to each other, and the extension parts 361 of two adjacent second pre-fixing films 36 in the battery string are arranged adjacent to each other.

[0108] In this embodiment, the first pre-fixing film 33 only forms the extension part 330 at the first battery edge 311, and the second pre-fixing film 36 only forms the extension part 361 at the second battery edge 312, so that one side edge of the battery cell 31 where the extension part 361 is provided does not have the extension part 330, and one side edge of the battery cell 31 where the extension part 330 is provided does not have the extension part 361, realizing the dislocation arrangement of the extension part 361 of the second pre-fixing film 36 and the extension part 330 of the first pre-fixing film 33, avoiding the overlap of the second pre-fixing film 36 and the first pre-fixing film 33, and ensuring the good appearance of the solar cell module.

[0109] As an embodiment of the present invention, the extension portions 330 of two adjacent first pre-fixing films 33 of the battery string are connected to each other.

[0110] Specifically, the first extension portions 331 of two adjacent first pre-fixing films 33 of the battery string may be connected to each other, or the first extension portion 331 and the second extension portion 332 of two adjacent first pre-fixing films 33 of the battery string may be connected to each other. The connection of the extension portions 330 of the first pre-fixing films 33 of two adjacent battery cells 31 in the battery string can achieve mutual fixation and limitation between adjacent first pre-fixing films 33, and improve the fixation effect of the first pre-fixing films 33.

[0111] As an embodiment of the present invention, the extended portions 361 of two adjacent second pre-fixing films 36 of the battery string are connected to each other.

[0112] In this embodiment, two adjacent second pre-fixing films 36 of the battery string are connected to each other, so as to achieve mutual fixation and limitation between adjacent second pre-fixing films 36, and improve the fixation effect of the second pre-fixing films 36.

[0113] As an embodiment of the present invention, the extension portions 330 of two adjacent first pre-fixing films 33 in the battery string are overlapped and 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 first main body portion 336, which can enhance the structural strength of the connection of the extension portions 330 of the first pre-fixing films 33, and thus can enhance the mutual fixation and limitation effect between adjacent first pre-fixing films 33.

[0114] As an embodiment of the present invention, the extended portions 361 of two adjacent second pre-fixing films 36 of the battery string are overlapped to form a second overlapping portion 400, and the thickness D4 of the second overlapping portion 400 is greater than the thickness D5 of the second main body portion 360. The overlapping of the extended portions 361 of two adjacent second pre-fixing films 36 to form a second overlapping portion 400 can enhance the structural strength of the connection of adjacent second pre-fixing films 36, and can further improve the reliability of the second pre-fixing film 36 in fixing the welding strip 32.

[0115] As an embodiment of the present invention, the first overlapping portion 300 is provided with a first cavity structure. In this embodiment, since the first overlapping portion 300 is provided with a first 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 combine more firmly with the first overlapping portion 300, which can greatly increase the bonding force between the first overlapping portion 300 and the first adhesive film 2 and the second adhesive film 4, and improve the fixing effect of the first pre-fixing film; at the same time, the first cavity structure provided in the first overlapping portion 300 can play a buffering role, reduce the stress of the first pre-fixing film 33, avoid the fracture of the first pre-fixing film 33, and make the combination between adjacent first pre-fixing films 33 more stable.

[0116] As an embodiment of the present invention, the second overlapping portion 400 is provided with a second cavity structure. In this embodiment, since the second overlapping portion 400 is provided with a cavity structure, the second overlapping portion 400 has a loose structure. The cavity structure enables the first adhesive film 2 and the second adhesive film 4 to be more firmly combined with the second overlapping portion 400, which can greatly increase the bonding force between the second overlapping portion 400 and the first adhesive film 2 and the second adhesive film 4, and improve the fixing effect of the first pre-fixed film; at the same time, the cavity structure provided in the second overlapping portion 400 can play a buffering role, reduce the stress of the second pre-fixed film 36, avoid the fracture of the second pre-fixed film 36, and make the combination between adjacent second pre-fixed films 36 more stable. Among them, the first cavity structure and the second cavity structure can specifically be a hollow cavity or a cavity filled with air.

[0117] Embodiment Seven

[0118] Please refer to Figure 6 and Figure 8 , as an embodiment of the present invention, each epitaxial portion 330 includes:

[0119] A first extension portion 3311 connected to the first main body portion 336, and the first extension portion 3311 is bent relative to the first main body portion 336 in a direction close to the plane where the second surface 316 is located.

[0120] In this embodiment, the first extension portion 3311 is used to cover the edge position of the battery cell 31, and a part of the first extension portion 3311 is located above the plane where the first surface 315 is located, and a part of the first extension portion 3311 is located below the plane where the first surface 315 is located. The first extension portion 3311 can better limit the movement of the first pre-fixed 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-fixed film 33 on the welding tape 32.

[0121] 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 vertical distance from the first end of the upper surface 3310 to the plane where the second surface 316 is located is greater than the vertical distance from the second end of the upper surface 3310 to the plane where the second surface 316 is located.

[0122] In this embodiment, since the first extension portion 3311 is bent from the first battery edge 311 towards the plane of the second surface 316, the vertical distance from the first end of the upper surface 3310 to the plane of the second surface 316 is greater than the vertical distance from the second end of the upper surface 3310 to the plane of the second surface 316, making the first extension portion 3311 inclined relative to the second surface 316, which is conducive to increasing the total length design of the epitaxial portion 330, thereby increasing the bonding area between the epitaxial portion 330 and the first adhesive film 2 and the second adhesive film 4, and enhancing the adhesion of the epitaxial portion 330.

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

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

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

[0126] In this embodiment, the upper surface 3310 of the first extension portion 3311 can be an inclined surface or a curved surface, which is convenient for the processing and forming of the first extension portion 3311 and can ensure the contact area between the first extension portion 3311 and the second adhesive film 4. The upper surface 3310 of the first extension portion 3311 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 enhancing the fixing effect of the first pre-fixing film 33.

[0127] As an embodiment of the present invention, the angle between the upper surface 3310 of the first extension portion 3311 and the plane of the second surface 316 is 10 - 80°. In this embodiment, the angle between the upper surface 3310 of the first extension portion 3311 and the plane of the second surface 316 is set within the range of 10 - 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, resulting in the first extension portion 3311 not being easily broken and enhancing the structural reliability of the first pre-fixing film 33. For example, the angle between the upper surface 3310 of the first extension portion 3311 and the plane of the second surface 316 can be any value among 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°.

[0128] As an embodiment of the present invention, the cell 31 includes a plurality of side surfaces 319 connecting the first surface 315 and the second surface 316. The epitaxial portion 330 wraps around at least a partial area of at least one side surface 319, which can increase the adhesion force between the first pre-fixing film 33 and the cell 31, make the fixation of the first pre-fixing film 33 more stable, and prevent the position deviation of the solder strip 32.

[0129] Among them, the epitaxial portion 330 only partially wraps around a partial area of the side surface 319. On the one hand, it can increase the adhesion force between the first pre-fixing film 33 and the cell 31 and improve the fixation effect of the first pre-fixing film 33. On the other hand, it can avoid too large a bending angle of the first epitaxial portion 331, prevent the fracture of the first epitaxial portion 331, and improve the structural stability of the first epitaxial portion 331.

[0130] The epitaxial portion 330 can also wrap around the entire area of the side surface 319, which can greatly increase the adhesion force between the first pre-fixing film 33 and the cell 31, and further prevent the loosening of the first pre-fixing film 33; moreover, the solder strip 32 can be fixed on the side surface 319 by using the epitaxial portion 330, which can avoid the solder strip 32 from warping and loosening away from the second surface 316 at the edge position of the cell 31, and greatly improve the fixing effect of the solder strip 32.

[0131] Please refer to Figure 6 As an embodiment of the present invention, the first adhesive film 2 wraps around at least a partial area of the side surface 319. The first adhesive film 2 includes a filling portion 21 wrapping around the side surface 319, and the filling portion 21 is located between the epitaxial portion 330 and the side surface 319.

[0132] As an embodiment of the present invention, the epitaxial portion 330 further includes:

[0133] A second extension portion 3312 connected to the first extension portion 3311. The second extension portion 3312 extends away from the cell 31 from the first extension portion 3311, and the second extension portion 3312 is connected between the first adhesive film 2 and the second adhesive film 4.

[0134] In this embodiment, the second extension portion 3312 of each epitaxial portion 330 is connected between the first adhesive film 2 and the second adhesive film 4, which can further increase the bonding area between the epitaxial portion 330 and the first adhesive film 2 and the second adhesive film 4, and is conducive to further improving the fixation effect of the first pre-fixing film 33. Among them, the second extension portion 3312 can be arranged parallel to the second surface 316 of the cell 31, or the second extension portion 3312 can also be arranged non-parallel to the second surface 316 of the cell 31.

[0135] As an embodiment of the present invention, the second extension portion 3312 is disposed at an angle with respect to the first extension portion 3311, that is, the second extension portion 3312 is non-parallel or non-collinear with respect to the first extension portion 3311, and the second extension portion 3312 is bent with respect to the first extension portion 3311, which is beneficial to further increasing the bonding force between the extension portion 330 and the adhesive film.

[0136] As an embodiment of the present invention, the extension portion 330 may further include a third extension portion (not shown in the figure) connected to the first extension portion 3311 and extending to the second surface 316, and the third extension portion surrounds a partial area of the second surface 316.

[0137] In this embodiment, the extension portion 330 is provided with a third extension portion connected to the first extension portion 3311 and extending to the second surface 316, and the third extension portion surrounds a partial area of the edge of the second surface 316. By using the cooperation between the third extension portion 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 can fix the welding strip 32 on the side surface of the battery cell 31, which can greatly improve the reliability of the welding strip 32 fixed on the battery cell 31.

[0138] Please refer to Figure 6 , as an embodiment of the present invention, the thickness D2 of the first main body portion 336 is less than the thickness D3 of the battery cell 31.

[0139] In this embodiment, the first pre-fixing film 33 can be flexibly set according to the thickness of the battery cell 31, and the thickness of the first pre-fixing film 33 before lamination is less than the thickness D3 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 D2 of the first main body portion 336 is less than the thickness D3 of the battery cell 31, which is beneficial to the first pre-fixing film 33 to be bent to form the extension portion 330 after lamination, beneficial to increasing the fixing effect of the first pre-fixing film 33, and at the same time can avoid the influence of the too thick first pre-fixing film 33 on the performance of the solar cell module.

[0140] As an embodiment of the present invention, the thickness of at least a partial area of the first extension portion 3311 is greater than the thickness of the first main body portion 336.

[0141] In this embodiment, it is possible that only part of the first extension portion 3311 has a thickness greater than that of the first main body portion 336, or it is possible that the entire region of the first extension portion 3311 has a thickness greater than that of the first main body portion 336. Since at least part of the first extension portion 3311 can have a thickness greater than that of the first 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 first extension portion 3311 can be prevented from breaking, 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.

[0142] Embodiment VIII

[0143] Please refer to Figure 6 and Figure 8 , as an embodiment of the present invention, the first pre-fixing film 33 further includes:

[0144] A convex structure 335 protruding from the outer extension portion 330, and the convex structure 335 is connected to the first adhesive film 2 and / or the second adhesive film 4.

[0145] In the embodiment of the present invention, the convex structure 335 can be provided on one side of the outer extension portion 330 close to the second surface 316, or can be provided on the side of the outer extension portion 330 facing away from the second surface 316, and the protruding direction on the outer extension portion 330 is not limited. The convex structure 335 can protrude in the direction of the first adhesive film 2 or the second adhesive film 4. In addition, the convex structure 335 can also protrude in the direction of 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.

[0146] Specifically, the convex structure 335 can include a first convex structure 3351 protruding from the first outer extension portion 331, a second convex structure 3352 protruding from the second outer extension portion 332, a third convex structure 3353 protruding from the third outer extension portion 333, and a fourth convex structure 3354 protruding from the fourth outer extension portion 334. It can be understood that the convex structure 335 can be provided on each of the first outer extension portion 331, the second outer extension portion 332, the third outer extension portion 333, and the fourth outer extension portion 334, or only one of the first outer extension portion 331, the second outer extension portion 332, the third outer extension portion 333, and the fourth outer extension portion 334 can be provided with the convex structure 335. Among them, the structures of the convex structures 335 on each outer extension portion 330 are the same. Of course, in some other embodiments, the structures of the convex structures 335 on each outer extension portion 330 can also be different.

[0147] Please refer to Figure 5, 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.

[0148] In this embodiment, the extension part 330 of the first pre-fixing film 33 is connected to the first adhesive film 2 and / or the second adhesive film 4 by means of the protrusion structure 335, further enhancing the bonding force between the extension part 330 and the adhesive film, and strengthening the fixing effect; moreover, the protrusion structure 335 can reduce the tensile force of the extension part 330, play a buffering effect, and prevent the extension part 330 from breaking.

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

[0150] In this embodiment, when the protrusion structure 335 is provided 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 provided at the connection of the first extension part 3311 and the second extension part 3312.

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

[0153] As an embodiment of the present invention, the surface of each convex structure 335 away from the first adhesive film 2 is provided as a wavy surface.

[0154] In this embodiment, the surface of each convex structure 335 away from the first adhesive film 2 is provided as a wavy surface. The wavy surface can further increase the bonding force between the convex structure 335 and the second adhesive film 4, further improving the fixing effect of the first pre-fixing film 33, thereby improving the fixing effect of the solder tape 32.

[0155] Please refer to again Figure 5 , as an embodiment of the present invention, each convex structure 335 includes a first side edge 3356 close to the solar cell 31 and a second side edge 3357 far from the solar cell 31, and the first side edge 3356 and the second side edge 3357 are arranged in an uneven connection.

[0156] In this embodiment, the first side edge 3356 and the second side edge 3357 of the convex structure 335 are in a wavy shape of uneven connection, which can further improve the bonding force between the convex structure 335 and the first adhesive film 2 and the second adhesive film 4, and further improve the fixing effect of the first pre-fixing film 33.

[0157] As an embodiment of the present invention, the length of the first convex structure 3351 and the second convex structure 3352 in the second direction X is greater than or equal to the length of the solar cell 31 in the second direction X, which is beneficial to further improving the fixing effect of each solder tape 32.

[0158] As an embodiment of the present invention, the length of the third convex structure 3353 and the fourth convex structure 3354 in the first direction Y is greater than or equal to the length of the solar cell 31 in the first direction Y, which can further improve the fixing effect of the first pre-fixing film 33.

[0159] As an embodiment of the present invention, at the position of the second adhesive film 4 corresponding to the convex structure 335, a groove matching the convex structure 335 is formed, and the convex structure 335 is embedded in the groove.

[0160] In this embodiment, the convex structure 335 is embedded in the groove of the second adhesive film 4, so that an uneven mating structure is formed between the first pre-fixed film 33 and the second adhesive film 4, which can further prevent the first pre-fixed film 33 from loosening relative to the second adhesive film 4 and improve the fixing effect between the first pre-fixed film 33 and the second adhesive film 4.

[0161] As an embodiment of the present invention, the first convex structure 3351 is disposed on the first extension portion 3311 of the first extension portion 331 of the first pre-fixed film 33. The sum of the projection lengths of the first convex structure 3351 and the first extension portion 3311 of the first extension portion 331 along the first direction Y is 30 to 400 microns.

[0162] 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 along the first direction Y is 30 to 400 microns, which can ensure a good fixing effect of the first pre-fixed film 33 and at the same time play a good role in fixing and limiting the welding tape 32.

[0163] 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 along the first direction Y is 30 to 400 microns.

[0164] 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 along the first direction Y is 30 to 400 microns, which can ensure a good fixing effect of the first pre-fixed film 33 and at the same time play a good role in fixing and limiting the welding tape 32.

[0165] Embodiment Nine

[0166] 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 has the same or similar beneficial effects as the above solar cell module, and the relevant parts between the two can be referred to each other. To avoid repetition, it will not be elaborated here.

[0167] 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 can also be applied to devices or apparatuses that generate electricity using solar energy, such as a user solar power supply, a solar street lamp, a solar vehicle, a solar building, and so on. 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 the photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array 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 combiner box, and the combiner 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 mains power grid and then connected to the mains network to achieve solar power supply.

[0168] In the description of this specification, the descriptions with reference to terms such as "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.

[0169] 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 should be included in the protection scope of the present invention.

Claims

1. A solar cell module, characterized in that, It includes a first cover plate, a first adhesive film, at least one battery string, a second adhesive film and a second cover plate which are stacked in sequence. The battery string includes: A plurality of solar cells arranged at intervals in a first direction. The solar cells include a first surface and a second surface which are oppositely arranged. A plurality of welding tapes. Adjacent two of the solar cells are connected by the welding tapes. The welding tapes extend along the first direction. The plurality of welding tapes are arranged at intervals in a second direction which intersects with the first direction. The welding tape includes a first welding portion arranged on the first surface, a second welding portion arranged on the second surface, and a connecting portion connecting the first welding portion and the second welding portion. A plurality of first pre-fixing films. Each first pre-fixing film is arranged on the corresponding solar cell. The first pre-fixing film is arranged on the first welding portion and covers and fixes on the first surface. The second adhesive film covers the first pre-fixing film. And A plurality of second pre-fixing films. Each second pre-fixing film is arranged on the corresponding solar cell. The second pre-fixing film is arranged on the second welding portion and covers and fixes on the second surface. The first adhesive film covers the second pre-fixing film. At least one of the first pre-fixing film and the second pre-fixing film extends to the outside of the edge of the solar cell and is connected to the first adhesive film and the second adhesive film.

2. The solar cell module according to claim 1, wherein, The first pre-fixing film extends to the outside of the edge of the solar cell and is connected to the first adhesive film and the second adhesive film. The second pre-fixing film does not extend to the outside of the edge of the solar cell.

3. The solar cell module according to claim 1, wherein The first pre-fixing film includes a first main body portion covering the first surface, and at least one extension portion connected to the first main body portion and extending to the outside of the edge of the solar cell. The extension portion is connected to the first adhesive film and the second adhesive film.

4. The solar cell module according to claim 3, characterized in that, The second pre-fixing film includes a second main body portion covering the second surface, and at least one protruding portion connected to the second main body portion and extending to the outside of the edge of the solar cell.

5. The solar cell module according to claim 4, wherein The projection of the protruding portion on the plane where the first surface is located does not overlap with the projection of the extension portion.

6. The solar cell module according to claim 3, characterized in that, The solar cell includes a first battery edge and a second battery edge which are oppositely arranged in the first direction. The extension portion includes a first extension portion and a second extension portion respectively arranged at opposite ends of the first main body portion in the first direction. The first extension portion covers the first battery edge and extends along the first direction to the outside of the first battery edge. The second extension portion covers the second battery edge and extends along the first direction to the outside of the second battery edge.

7. The solar cell module according to claim 3 or 6, characterized in that, The solar cell includes a third battery edge and a fourth battery edge which are oppositely arranged in the second direction. The extension portion includes a third extension portion and a fourth extension portion respectively connected to opposite ends of the first main body portion in the second direction. The third extension portion covers the third battery edge and extends along the second direction to the outside of the third battery edge. The fourth extension portion covers the fourth battery edge and extends along the second direction to the outside of the fourth battery edge.

8. The solar cell module according to claim 4, wherein, The cell includes a first cell edge and a second cell edge oppositely arranged along the first direction. The epitaxial portion is disposed at one end of the first main portion close to the first cell edge, and the epitaxial portion covers the first cell edge and extends outside the first cell edge. The protruding portion is disposed at one end of the second main portion close to the second cell edge. The protruding portion covers the second cell edge and extends outside the second cell edge. The epitaxial portions of two adjacent first pre-fixing films of the cell string are adjacently arranged. The protruding portions of two adjacent second pre-fixing films of the cell string are adjacently arranged.

9. The solar cell module according to claim 3 or 8, characterized in that, The epitaxial portions of two adjacent first pre-fixing films of the cell string are connected to each other.

10. The solar cell module according to claim 3 or 8, characterized in that, The epitaxial portions of two adjacent first pre-fixing films in the cell string are overlapped and connected to form a first overlapping portion, and the thickness of the first overlapping portion is greater than the thickness of the first main portion.

11. The solar cell module according to claim 4 or 8, characterized in that, The protruding portions of two adjacent second pre-fixing films of the cell string are connected to each other.

12. The solar cell module according to claim 4 or 8, characterized in that, The protruding portions of two adjacent second pre-fixing films in the cell string are overlapped and connected to form a second overlapping portion, and the thickness of the second overlapping portion is greater than the thickness of the second main portion.

13. The solar cell module according to claim 10, wherein The first overlapping portion is provided with a first cavity structure.

14. The solar cell module according to claim 12, characterized in that, The second overlapping portion is provided with a second cavity structure.

15. The solar cell module according to claim 3, characterized in that, The epitaxial portion is bent relative to the first main portion in a direction close to the plane where the second surface is located.

16. The solar cell module according to claim 1, wherein The cell includes a first grid line disposed on the first surface and a second grid line disposed on the second surface. The polarities of the first grid line and the second grid line are opposite. The first welding portion connects the first grid line on one cell, and the second welding portion connects the second grid line on another cell.

17. The solar cell module according to claim 1, characterized in that, Both the first pre-fixing film and the second pre-fixing film include at least one of a PVB film, an EVA film, an EPE film, an EP film, and a POE film.

18. A photovoltaic system, characterized in that, A solar cell module includes any one of claims 1 to 17.

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