Photovoltaic module

Abstract

The utility model discloses a photovoltaic module, which is applied to the photovoltaic field and comprises a front plate, a front packaging adhesive film, a photovoltaic cell layer, a back packaging adhesive film and a back plate which are sequentially stacked, an edge reflective film is also arranged between the back plate and the front plate; the edge reflective film comprises a first edge sub-reflective film and a second edge sub-reflective film; the included angle between the reflecting microstructure in the first edge sub-reflecting film and the back plate is smaller than the included angle between the reflecting microstructure in the second edge sub-reflecting film and the back plate. According to the utility model, the included angle between the reflecting microstructure in the first edge sub-reflecting film and the back plate is smaller than the included angle between the reflecting microstructure in the second edge sub-reflecting film and the back plate, so that the photoelectric conversion efficiency during layout in a low-latitude region can be improved.

Description

Technical Field

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

[0002] Photovoltaic power generation, as a green energy source, has driven energy transition and carbon neutrality. To improve the light-gathering efficiency of solar cells and thus enhance the photoelectric conversion efficiency of photovoltaic modules, existing photovoltaic modules typically incorporate reflective films between adjacent cells, between adjacent cell strings, and around the perimeter of the photovoltaic cell layer formed by all the cells. However, the spacing of these reflective films at different locations within the module is generally the same to ensure ease of fabrication. With the increasing demand for high-power photovoltaic modules, there is still room for improvement in the output power of existing modules.

[0003] Therefore, how to improve the output power of existing photovoltaic modules is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a photovoltaic module that solves the problem of how to more effectively improve the output power of existing photovoltaic modules.

[0005] To solve the above-mentioned technical problems, this utility model provides a photovoltaic module, comprising:

[0006] The front panel, front encapsulating film, photovoltaic cell layer, back encapsulating film and back panel are stacked in sequence.

[0007] An edge reflective film is also provided between the back panel and the front panel;

[0008] The edge reflective film includes a first edge sub-reflective film and a second edge reflective film;

[0009] The angle between the reflective microstructure in the first edge sub-reflective film and the back plate is smaller than the angle between the reflective microstructure in the second edge sub-reflective film and the back plate.

[0010] Optionally, the first edge sub-reflective film and the second edge sub-reflective film are disposed opposite to each other, and the edge reflective film further includes a third edge sub-reflective film;

[0011] The angle between the reflective microstructure in the first edge sub-reflective film and the back plate is smaller than the angle between the reflective microstructure in the third edge sub-reflective film and the back plate, and the angle between the reflective microstructure in the third edge sub-reflective film and the back plate is smaller than the angle between the reflective microstructure in the second edge sub-reflective film and the back plate.

[0012] Optionally, the angle between the reflective microstructure in the first edge sub-reflective film and the back plate is in the range of 0° to 45°, and the angle between the reflective microstructure in the second edge sub-reflective film and the back plate is in the range of 45° to 90°.

[0013] Optionally, the reflective microstructure in the edge reflective film has a right-angled triangular cross-section along the direction perpendicular to the back plate, and the hypotenuse of the right-angled triangular cross-section faces the photovoltaic cell layer.

[0014] Optionally, the edge reflective film includes a reflective substrate layer, the reflective microstructure formed on one side surface of the reflective substrate layer, and an adhesive layer connected to the side of the reflective substrate layer opposite to the reflective microstructure.

[0015] Optionally, the reflective substrate layer and the reflective microstructure are an integral reflective layer.

[0016] Optionally, the integrated reflective layer includes raw material resin and reflective particles;

[0017] The reflective particles include at least one of titanium dioxide particles and calcium carbonate particles.

[0018] Optionally, the adhesive layer has an embossed surface on the side facing away from the reflective substrate layer.

[0019] Optionally, the adhesive layer is a hot-melt ethylene-vinyl acetate copolymer film.

[0020] Optionally, the photovoltaic cells in the photovoltaic cell layer have a length of 210 mm and a width of 91 mm;

[0021] Six of the battery cells are arranged along the length of the battery cell, and 26 of the battery cells are arranged along the width of the battery cell.

[0022] As can be seen, the photovoltaic module provided by this utility model includes a front panel, a front encapsulating film, a photovoltaic cell layer, a back encapsulating film, and a back sheet stacked sequentially. An edge reflective film is also provided between the back sheet and the front panel. The edge reflective film includes a first edge sub-reflective film and a second edge sub-reflective film. The angle between the reflective microstructure in the first edge sub-reflective film and the back sheet is smaller than the angle between the reflective microstructure in the second edge sub-reflective film and the back sheet. This utility model, by setting edge reflective films at the four edges of the photovoltaic cell layer corresponding to the back sheet, and corresponding to the upper and lower ends of the back sheet during photovoltaic module installation, and with the angle between the reflective microstructure in the first edge sub-reflective film and the back sheet being smaller than the angle between the reflective microstructure in the second edge reflective film and the back sheet, can increase the probability of the edge reflective film reflecting light beams to the surface of the cell, especially improving the photoelectric conversion efficiency when deployed in low-latitude regions. Attached Figure Description

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

[0024] Figure 1 This is a schematic diagram of a partial structure in a photovoltaic module provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the incident beam path in a photovoltaic module provided by an embodiment of this utility model;

[0026] Figure 3 An example diagram of the cell layout in a photovoltaic module provided for an embodiment of this utility model;

[0027] Figure 4 A schematic diagram of the structure of an edge reflective film in a photovoltaic module provided by an embodiment of this utility model;

[0028] The annotations in the attached figures are explained as follows:

[0029] 1-Solar cell, 2-Incident beam, 10-Front panel, 20-Photovoltaic cell layer, 30-Back panel, 40-Edge reflective film, 41-First edge sub-reflective film, 42-Second edge sub-reflective film, 43-Third edge sub-reflective film, 44-Reflective substrate layer, 45-Reflective microstructure, 46-Adhesive layer. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] Example 1:

[0032] Please refer to Figure 1 , Figure 1 This is a partial structural diagram of a photovoltaic module provided as an embodiment of the present invention. The photovoltaic module may include:

[0033] The front panel 10, the front encapsulating film, the photovoltaic cell layer 20, the back encapsulating film, and the back panel 30 are stacked in sequence.

[0034] An edge reflective film 40 is also provided between the back panel 30 and the front panel 10;

[0035] The edge reflective film 40 includes a first edge sub-reflective film 41 and a second edge sub-reflective film 42;

[0036] The angle between the reflective microstructure 45 in the first edge sub-reflective film 41 and the back plate 30 is smaller than the angle between the reflective microstructure 45 in the second edge sub-reflective film 42 and the back plate 30.

[0037] It should be noted that in this embodiment, an edge reflective film 40 is provided between the back panel 30 and the front panel 10. However, it should be further noted that in this embodiment, an inter-cell reflective film can also be provided between adjacent cells 1 in the photovoltaic cell layer 20, and correspondingly, an inter-string reflective film can also be provided between adjacent cell strings in the photovoltaic cell layer 20. In this embodiment, whether it is the edge reflective film 40 or the aforementioned inter-cell reflective film and inter-string reflective film, they all include reflective microstructures 45. In this embodiment, the reflective microstructures 45 in the edge reflective film 40 are mainly described. The edge reflective film 40 is generally arranged at the four edges of the back panel 30. When the photovoltaic module is finally manufactured and installed, it is generally arranged at an angle to the ground. At this time, the photovoltaic module has an upper and lower end in the vertical direction. Correspondingly, the back panel 30 in the photovoltaic module also has an upper and lower end in the vertical direction. The part of the edge reflective film 40 at the upper end of the back panel 30 is defined as the first edge sub-reflective film 41. The portion of the edge reflective film 40 at the lower end of the back panel 30 is defined as the second edge sub-reflective film 42. Alternatively, during photovoltaic module installation, the first edge sub-reflective film 41 can be positioned lower and the second edge sub-reflective film 42 can be positioned higher. In this application, the photovoltaic module only needs to satisfy the requirement that there is a first edge sub-reflective film and a second edge sub-reflective film in the edge reflective film between the back panel and the front panel, and that the angle between the reflective microstructure in the first edge sub-reflective film and the back panel is smaller than the angle between the reflective microstructure in the second edge sub-reflective film and the back panel. Subsequently, during the actual installation of the photovoltaic module, the first edge sub-reflective film 41 is positioned lower relative to the second edge reflective film 42. In actual operation, in this embodiment, the angle formed between the reflective microstructure 45 in the first edge sub-reflective film 41 and the surface of the back plate 30 is set to be smaller than the angle formed between the reflective microstructure 45 in the second edge sub-reflective film 42 and the surface of the back plate 30. This is more conducive to reflecting the light beam that irradiates the four edges of the photovoltaic cell layer 20 back to the incident surface of the cell 1, thereby further improving the photoelectric conversion efficiency of the photovoltaic module.

[0038] This embodiment does not limit the specific materials of the front panel 10 and the back panel 30 in the photovoltaic module. For example, the front panel 10 can be a front panel glass, and the back panel 30 can be a back panel glass. In this case, you can refer to... Figure 2 , Figure 2 This is a schematic diagram of the incident beam path in a photovoltaic module according to an embodiment of the present invention. The incident beam 2 shines through the front glass onto the reflective microstructure 45 on the surface of the edge reflective film 40, and is reflected back to the front glass by the surface of the reflective microstructure 45. After a second reflection by the front glass, it reaches the surface of the solar cell 1, thereby increasing the power of the solar cell 1. Accordingly, the specific materials of the front and back encapsulation films in this embodiment can be set according to actual needs. This embodiment does not limit the specific material and structure of the edge reflective film 40, as long as it can at least partially reflect the beam incident on the periphery of the photovoltaic cell layer 20 back to the incident surface of the solar cell 1 in the photovoltaic cell layer 20. For example, the edge reflective film 40 can be made of an insulating material to avoid short circuits caused by connection with the busbar, which could damage the photovoltaic module.

[0039] Furthermore, in order to improve the photoelectric conversion efficiency of the photovoltaic module, the first edge sub-reflective film and the second edge sub-reflective film can be arranged opposite to each other, and the edge reflective film 40 also includes a third edge sub-reflective film 43;

[0040] The angle between the reflective microstructure 45 in the first edge sub-reflective film 41 and the back plate 30 is smaller than the angle between the reflective microstructure 45 in the third edge sub-reflective film 43 and the back plate 30, and the angle between the reflective microstructure 45 in the third edge sub-reflective film 43 and the back plate 30 is smaller than the angle between the reflective microstructure 45 in the second edge sub-reflective film 42 and the back plate 30.

[0041] It should be noted that, in this embodiment, when the photovoltaic module is finally manufactured and installed, the photovoltaic module has an upper end, a lower end, and a side edge between the upper and lower ends in the vertical direction. Similarly, the backsheet 30 of the photovoltaic module also has an upper end, a lower end, and a side edge between the upper and lower ends in the vertical direction. Therefore, the portion of the edge reflective film 40 at the upper end of the backsheet 30 is defined as the first edge sub-reflective film 41, the portion of the edge reflective film 40 at the side of the backsheet 30 is defined as the third edge sub-reflective film 43, and the portion of the edge reflective film 40 at the lower end of the backsheet 30 is defined as the second edge sub-reflective film 43. In actual operation, the light-reflecting film 42 sets the angle between the reflective microstructure 45 in the first edge sub-reflective film 41 and the surface of the back plate 30 to be smaller than the angle between the reflective microstructure 45 in the third edge sub-reflective film 43 and the surface of the back plate 30, and sets the angle between the reflective microstructure 45 in the third edge sub-reflective film 43 and the surface of the back plate 30 to be smaller than the angle between the reflective microstructure 45 in the second edge sub-reflective film 42 and the surface of the back plate 30. This is more conducive to reflecting the light beam illuminating the periphery of the photovoltaic cell layer 20 back to the incident surface of the cell 1, further improving the photoelectric conversion efficiency of the photovoltaic module. In this embodiment, the first edge sub-reflective film, the second edge sub-reflective film, and the third edge sub-reflective film surround the area where the photovoltaic cell layer is placed.

[0042] Furthermore, in order to ensure the reflection efficiency of the photovoltaic module's edge reflective film 40 for the light beam, the angle between the reflective microstructure 45 in the first edge sub-reflective film 41 and the back plate 30 can be set to be in the range of 0° to 45°, and the angle between the reflective microstructure 45 in the second edge sub-reflective film 42 and the back plate 30 can be set to be in the range of 45° to 90°.

[0043] It should be noted that in this embodiment, the angle between the reflective microstructure 45 in the first edge sub-reflective film 41 and the back plate 30 is set to 0° to 45°, and the angle between the reflective microstructure 45 in the second edge sub-reflective film 42 and the back plate 30 is set to 45° to 90°. This ensures that in low-latitude regions, the light beam irradiating the surface of the edge reflective film 40 is reflected and re-irradiates the surface of the battery cell 1.

[0044] Furthermore, in order to ensure that the reflective microstructure 45 reflects the light beam to the surface of the solar cell 1, the cross section of the reflective microstructure 45 in the edge reflective film 40 along the direction perpendicular to the back plate 30 can be set to be a right-angled triangular cross section, and the hypotenuse of the right-angled triangular cross section faces the photovoltaic cell layer 20.

[0045] In this embodiment, the reflective microstructure 45 in the edge reflective film 40 has a right-angled triangular cross-section along the direction perpendicular to the backplate 30, with the hypotenuse of the right-angled triangular cross-section facing the photovoltaic cell layer 20. That is, this cross-section is perpendicular to the backplate 30 and points from the edge reflective film 40 towards the photovoltaic cell layer 20. The vertical side of this right-angled triangular cross-section faces away from the photovoltaic cell layer 20, which facilitates the reflection of light beams incident on the edge reflective film 40 back to the surface of the solar cell 1, improving the effective light utilization rate of the photovoltaic module. In this embodiment, the reflective microstructure formed in the intermediate reflective film (which is the inter-string reflective film and inter-cell reflective film) has an isosceles triangular cross-section, with an angle between it and the backplate 30 generally around 45°. However, this angle can be adjusted from 0° to 90° depending on the application environment and the incident angle of light in different regions.

[0046] Furthermore, to increase the power output of photovoltaic modules, one can refer to... Figure 3 , Figure 3 This is an example diagram of the cell layout in a photovoltaic module provided by an embodiment of the present invention. The length of the cell 1 in the photovoltaic cell layer 20 can be set to 210 mm and the width to 91 mm.

[0047] There are 6 battery cells 1 arranged along the length of the battery cell 1 and 26 battery cells 1 arranged along the width of the battery cell 1.

[0048] It should be noted that existing photovoltaic cells mainly use silicon wafers with a size of 210 mm * 182 mm, and the mainstream photovoltaic modules are designed based on a 66-panel layout. Combined with inter-panel film technology to enhance power output, the module output power can exceed 620W. In this embodiment, the selected cell is 210 mm long and 182 mm wide. The 210 mm * 182 mm cell is cut along an edge perpendicular to 182 mm, including the cell grid lines prepared on the surface of cell 1. This results in cell 1 with a length of 210 mm and a width of 91 mm, which is then arranged in a 6*26 pattern. This allows the photovoltaic module to maintain the width of the existing 210 mm module and the length of 182-78 mm, improving product utilization and increasing the current output power of the photovoltaic module.

[0049] The photovoltaic module provided by this utility model includes a front panel 10, a front encapsulating film, a photovoltaic cell layer 20, a back encapsulating film, and a back sheet 30 stacked sequentially. An edge reflective film 40 is provided on the side of the back sheet 30 adjacent to the photovoltaic cell layer 20, corresponding to the light transmission gap. The edge reflective film 40 includes a first edge sub-reflective film 41 and a second edge sub-reflective film 42. The angle between the reflective microstructure 45 in the first edge sub-reflective film 41 and the back sheet 30 is smaller than the angle between the reflective microstructure 45 in the second edge sub-reflective film 42 and the back sheet 30. This invention provides an edge reflective film 40 between the back panel 30 and the front panel 10, corresponding to the periphery of the photovoltaic cell layer 20. A first edge sub-reflective film 41 and a second edge sub-reflective film 42 are provided at the upper and lower ends of the back panel 30 during photovoltaic module installation. The angle between the reflective microstructure 45 in the first edge sub-reflective film 41 and the back panel 30 is smaller than the angle between the reflective microstructure 45 in the second edge sub-reflective film 42 and the back panel 30. This increases the probability of the edge reflective film 40 reflecting light onto the surface of the cell 1, particularly improving the photoelectric conversion efficiency when deployed in low-latitude regions.

[0050] Furthermore, in this embodiment of the invention, the angle formed between the reflective microstructure 45 in the first edge sub-reflective film 41 and the surface of the back plate 30 is set to be smaller than the angle formed between the reflective microstructure 45 in the third edge sub-reflective film 43 and the surface of the back plate 30. Additionally, the angle formed between the reflective microstructure 45 in the third edge sub-reflective film 43 and the surface of the back plate 30 is set to be smaller than the angle formed between the reflective microstructure 45 in the second edge sub-reflective film 42 and the surface of the back plate 30. This arrangement is more conducive to reflecting the light beam illuminating the periphery of the photovoltaic cell layer 20 back to the incident surface of the cell 1, further improving the photoelectric conversion efficiency of the photovoltaic module. Setting the angle between the reflective microstructure 45 in the first edge sub-reflective film 41 and the back plate 30 to be 0° to 45°, and setting the angle between the reflective microstructure 45 in the second edge sub-reflective film 42 and the back plate 30 to be... The angle is 45° to 90°, which ensures that in low-latitude regions, the light beam that hits the surface of the edge reflective film 40 is reflected back to the surface of the solar cell 1. The cross-section is set as a right-angled triangle, with the hypotenuse of the right-angled triangle facing the photovoltaic cell layer 20 and the vertical side facing away from the photovoltaic cell layer 20. This makes it easier to reflect the light beam that hits the edge reflective film 40 back to the surface of the solar cell 1, thereby improving the effective light utilization rate of the photovoltaic module. The solar cell 1 is set to be 210 mm long and 91 mm wide. Six solar cells 1 are arranged along the length of the solar cell 1 and 26 solar cells 1 are arranged along the width of the solar cell 1. This can form a photovoltaic cell layer 20 with a module width of 210 mm and a module length of 182-78 mm, which is consistent with the industry standard, and improves the current output power of the photovoltaic module.

[0051] Example 2:

[0052] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the edge reflective film in a photovoltaic module provided by an embodiment of the present invention. The difference between this photovoltaic module and Embodiment 1 described above is that:

[0053] The aforementioned edge reflective film 40 includes a reflective substrate layer 44, a reflective microstructure 45 formed on one side surface of the reflective substrate layer 44, and an adhesive layer 46 connected to the side of the reflective substrate layer 44 facing away from the reflective microstructure 45.

[0054] In this embodiment, the edge reflective film 40 includes a reflective substrate layer 44, a reflective microstructure 45, and an adhesive layer 46. The reflective substrate layer 44 is used to support the reflective microstructure 45, that is, the reflective microstructure 45 is disposed on one side surface of the reflective substrate layer 44, and on the other side of the reflective substrate layer 44 opposite to the reflective microstructure 45, the adhesive layer 46 is connected, and the edge reflective film 40 is bonded and fixed to the back plate 30 through the adhesive layer 46.

[0055] Furthermore, in order to improve the ease of preparation and the stability of installation of the edge reflective film 40, the above-mentioned reflective substrate layer 44 and reflective microstructure 45 can be set as an integrated reflective layer.

[0056] It should be noted that in this embodiment, the reflective substrate layer 44 and the reflective microstructure 45 are set as an integral reflective layer, which can improve the stability of the reflective substrate layer 44 and the reflective microstructure 45. It is only necessary to prepare the reflective microstructure 45 on the surface of the reflective substrate layer 44, which improves the ease of preparation.

[0057] Furthermore, in order to ensure the stability of the integrated reflective layer and reduce the risk of breakage, the integrated reflective layer may include raw material resin and reflective particles.

[0058] The reflective particles include at least one of titanium dioxide particles and calcium carbonate particles.

[0059] It should be noted that the raw material resin in this embodiment may include ethylene-vinyl acetate copolymer particles and polyethylene particles. The ethylene-vinyl acetate copolymer particles can be used as the basic structural particles. By adding polyethylene particles, the tensile properties of the film layer can be improved, ensuring the mechanical properties of the film layer while reducing the risk of the film layer being torn during the lamination process. In this embodiment, by setting the reflective particles to include at least one of titanium dioxide particles and calcium carbonate particles, the reflective effect of the integrated reflective layer can be achieved, thereby improving the UV resistance of the edge reflective film 40 and reducing the risks of yellowing and brittle fracture. In this embodiment, the titanium dioxide and calcium carbonate can be mixed in an appropriate ratio to improve the reflective effect of the film layer and effectively reduce material costs. In a feasible implementation, the raw material resin can also be set to use polyolefin elastomer particles as the matrix. Polyolefin elastomer particles can improve the water resistance around the film layer and reduce the risk of product failure. Correspondingly, polyethylene can also be replaced by polypropylene, etc. The proportions of the components in this integrated reflective layer can be as follows: ethylene-vinyl acetate copolymer: polyethylene: titanium dioxide: calcium carbonate: other components = 82%: 15%: 0.8%: 0.2%: 2%. The other components mainly include auxiliary materials such as film crosslinking agents. Furthermore, in practical applications, the above formulation ratios can be adjusted according to actual requirements such as tensile strength and reflectivity. Specifically, considering the impact of thickness on the product, the thickness of this integrated reflective layer can be set to 150 micrometers, and correspondingly, the thickness of the adhesive layer 46 can be set to 75 micrometers. However, these can be adjusted according to actual conditions during application.

[0060] Furthermore, in order to improve the stability of the bonding between the edge reflective film 40 and the back plate 30, an embossed surface can be formed on the side surface of the adhesive layer 46 facing away from the reflective substrate layer 44.

[0061] It should be noted that in this embodiment, by setting an embossed pattern on the side surface of the adhesive layer 46 facing away from the reflective substrate layer 44, an embossed surface is formed on the side surface of the adhesive layer 46 facing away from the reflective substrate layer 44, which can improve the bonding stability between the adhesive layer 46 and the back plate 30, thereby improving the adhesion performance between the edge reflective film 40 and the glass.

[0062] Furthermore, in order to improve the compatibility between the adhesive layer 46 and the reflective substrate layer 44, the adhesive layer 46 can be provided as a hot-melt ethylene-vinyl acetate copolymer film layer.

[0063] In this embodiment, the adhesive layer 46 is set as a hot-melt ethylene-vinyl acetate copolymer film layer, which can further improve the stability of the prepared edge reflective film 40. In this embodiment, by controlling the melt index of the hot-melt ethylene-vinyl acetate copolymer film layer, while ensuring its good adhesive performance, the flowability of the adhesive layer 46 can be reduced, ensuring that the film strip is neat and without deviation during the lamination process.

[0064] The photovoltaic module provided by this utility model embodiment can ensure the functionality of the edge reflective film 40 by setting the edge reflective film 40 to include a reflective substrate layer 44, a reflective microstructure 45 formed on one side surface of the reflective substrate layer 44, and an adhesive layer 46 connected to the side of the reflective substrate layer 44 facing away from the reflective microstructure 45. Furthermore, by setting the reflective substrate layer 44 and the reflective microstructure 45 as an integrated reflective layer, the stability of the reflective substrate layer 44 and the reflective microstructure 45 can be improved, while the ease of film preparation can be increased. By setting the reflective particles to include at least one of titanium dioxide particles and calcium carbonate particles, the reflective effect of the integrated reflective layer can be guaranteed. By setting the adhesive layer 46 on the side surface opposite to the reflective substrate layer 44 to form an embossed surface on the side surface of the adhesive layer 46 opposite to the reflective substrate layer 44, the bonding stability between the adhesive layer 46 and the back plate 30 can be improved. By setting the adhesive layer 46 as a hot-melt ethylene-vinyl acetate copolymer film layer, the stability of the prepared edge reflective film 40 can be further improved.

[0065] In one feasible embodiment, the photovoltaic module described above may specifically include the following structure:

[0066] The front panel, front encapsulating film, photovoltaic cell layer, back encapsulating film and back panel are stacked in sequence.

[0067] An edge reflective film is also installed between the back panel and the front panel;

[0068] The edge reflective film includes a first edge sub-reflective film, a second edge sub-reflective film, and a third edge sub-reflective film; the first edge sub-reflective film and the second edge sub-reflective film are arranged opposite to each other;

[0069] The angle between the reflective microstructure in the first edge sub-reflective film and the back plate is smaller than the angle between the reflective microstructure in the third edge sub-reflective film and the back plate, and the angle between the reflective microstructure in the third edge sub-reflective film and the back plate is smaller than the angle between the reflective microstructure in the second edge sub-reflective film and the back plate; the angle between the reflective microstructure in the first edge sub-reflective film and the back plate is in the range of 0° to 45°, and the angle between the reflective microstructure in the second edge sub-reflective film and the back plate is in the range of 45° to 90°;

[0070] The reflective microstructure in the edge reflective film has a right-angled triangular cross-section along the direction perpendicular to the back sheet, and the hypotenuse of the right-angled triangular cross-section faces the photovoltaic cell layer;

[0071] The edge reflective film includes a reflective substrate layer, a reflective microstructure formed on one side surface of the reflective substrate layer, and an adhesive layer connected to the side of the reflective substrate layer opposite to the reflective microstructure. The reflective substrate layer and the reflective microstructure are an integral reflective layer, which includes a raw material resin and reflective particles, wherein the reflective particles include at least one of titanium dioxide particles and calcium carbonate particles. The adhesive layer has an embossed surface on the side surface opposite to the reflective substrate layer, and the adhesive layer is a hot-melt ethylene-vinyl acetate copolymer film layer.

[0072] The photovoltaic cell layer has a length of 210 mm and a width of 91 mm. There are 6 cells arranged along the length of the cell and 26 cells arranged along the width of the cell.

[0073] The edge reflective film used in this invention employs a particle-mixed reflective layer. The excellent mechanical properties of the material enhance the tensile strength of the film strip. A special diagonal texture design on its front surface effectively reflects incident light according to the application location, increasing the product's power. Next, a hot melt adhesive film is co-extruded with the aforementioned integrated reflective layer using an extrusion process. The hot melt adhesive film then undergoes a shallow embossing design, effectively improving its adhesion to glass. Subsequently, irradiation crosslinking or other crosslinking methods further enhance the product's mechanical properties. The co-extruded film layer is then cut to the required dimensions according to the product specifications, adhered to a transparent backing plate, and subjected to lamination and other processes to complete the fabrication of this invention. Generally, considering the influence of processes such as film application and lamination, it is recommended to cut the reflective film to cover the edge of the battery cell by 2 mm as a standard to reduce the risk of light leakage. In practical applications, the battery cell coverage size can be adjusted according to the process requirements, i.e., the width of the film strip can be adjusted accordingly.

[0074] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0075] Furthermore, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion.

[0076] The photovoltaic module provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the structure and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A photovoltaic module, characterized in that, include: The front panel, front encapsulating film, photovoltaic cell layer, back encapsulating film and back panel are stacked in sequence. An edge reflective film is also provided between the back panel and the front panel; The edge reflective film includes a first edge sub-reflective film and a second edge reflective film; The angle between the reflective microstructure in the first edge sub-reflective film and the back plate is smaller than the angle between the reflective microstructure in the second edge sub-reflective film and the back plate.

2. The photovoltaic module according to claim 1, characterized in that, The first and second edge sub-reflective films are disposed opposite to each other, and the edge reflective film further includes a third edge sub-reflective film; The angle between the reflective microstructure in the first edge sub-reflective film and the back plate is smaller than the angle between the reflective microstructure in the third edge sub-reflective film and the back plate, and the angle between the reflective microstructure in the third edge sub-reflective film and the back plate is smaller than the angle between the reflective microstructure in the second edge sub-reflective film and the back plate.

3. The photovoltaic module according to claim 1, characterized in that, The angle between the reflective microstructure in the first edge sub-reflective film and the back plate is in the range of 0° to 45°, and the angle between the reflective microstructure in the second edge sub-reflective film and the back plate is in the range of 45° to 90°.

4. The photovoltaic module according to claim 1, characterized in that, The reflective microstructure in the edge reflective film has a right-angled triangular cross-section along the direction perpendicular to the back plate, and the hypotenuse of the right-angled triangular cross-section faces the photovoltaic cell layer.

5. The photovoltaic module according to claim 1, characterized in that, The edge reflective film includes a reflective substrate layer, the reflective microstructure formed on one side surface of the reflective substrate layer, and an adhesive layer connected to the side of the reflective substrate layer opposite to the reflective microstructure.

6. The photovoltaic module according to claim 5, characterized in that, The reflective substrate layer and the reflective microstructure are an integrated reflective layer.

7. The photovoltaic module according to claim 6, characterized in that, The integrated reflective layer comprises raw material resin and reflective particles; The reflective particles include at least one of titanium dioxide particles and calcium carbonate particles.

8. The photovoltaic module according to claim 5, characterized in that, The adhesive layer has an embossed surface on the side facing away from the reflective substrate layer.

9. The photovoltaic module according to claim 8, characterized in that, The adhesive layer is a hot-melt ethylene-vinyl acetate copolymer film.

10. The photovoltaic module according to claim 1, characterized in that, The photovoltaic cell layer has a length of 210 mm and a width of 91 mm. Six of the battery cells are arranged along the length of the battery cell, and 26 of the battery cells are arranged along the width of the battery cell.

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