Reflective grid photovoltaic backboard and photovoltaic module

Abstract

The utility model relates to the technical field of photovoltaic backboards, and discloses a reflective grid photovoltaic backboard and a photovoltaic assembly. The reflective grid photovoltaic backboard comprises a transparent base material layer, a first transparent functional layer and a grid-shaped reflective pattern layer, the reflective pattern layer is arranged on the upper surface and / or the lower surface of the transparent substrate layer; the meshes of the reflective pattern layer are filled with the first transparent functional layer, and the first transparent functional layer can penetrate through the meshes and then make contact with local areas of the upper surface and / or the lower surface of the transparent base material layer; the thickness of the first transparent functional layer is greater than or equal to that of the reflective pattern layer, so that the outer surface of the first transparent functional layer is not lower than that of the reflective pattern layer. The reflective grid photovoltaic backboard has the advantages of local high transmittance and local high light reflectivity of the existing reflective grid backboard, effectively avoids the problems of cell piece fragmentation and grid delamination caused by lamination of a solar cell back film with an uneven surface and a solar cell, and can improve the yield of photovoltaic modules. The production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic backboard technical field, concretely relates to a reflective grid photovoltaic backboard and photovoltaic module. BACKGROUND

[0002] As the basic unit of photovoltaic power generation, the structure of photovoltaic module is photovoltaic front plate, first encapsulation adhesive film, solar cell (which includes a plurality of cell pieces in series and / or parallel), second encapsulation adhesive film and photovoltaic backboard from top to bottom. Among them, the photovoltaic backboard mainly plays the role of protecting and supporting the photovoltaic module, so as to keep the photovoltaic module normal work for more than 25 years in harsh natural environment. With the development of photovoltaic industry technology, people's performance requirements for photovoltaic backboard are also getting higher and higher. At present, in addition to meeting the conventional performance requirements (such as breaking strength, breaking elongation, peeling strength with EVA, UV resistance, moisture resistance) of photovoltaic backboard in production and processing and outdoor use, it also needs to consider its power gain effect on photovoltaic module through special function, so that this power gain effect can be beneficial to further reduce the cost of degree of electricity.

[0003] With the rapid development of double-sided power generation solar cell technology, photovoltaic backboard with high visible light transmittance has become one of the main functional photovoltaic backboards in market demand. For example, the transparent solar cell back film and its assembly provided in publication CN204441300U have high light transmittance, and the average light transmittance in the visible light region of 380-700 nm is >80%. However, for double-sided power generation photovoltaic module, if it is matched with transparent photovoltaic backboard with high visible light transmittance, the cell pieces and cell strings in the photovoltaic module are not covered by solar cell, so in the process of sunlight entering the inside of the photovoltaic module from the front, part of the sunlight will pass through the uncovered area of the solar cell, enter the air through the transparent photovoltaic backboard, and therefore this part of sunlight cannot be absorbed and utilized by the solar cell, which will cause light loss, and thus is not conducive to the power gain of double-sided power generation photovoltaic module.

[0004] Therefore, in order to improve the power gain of the bifacial power generation photovoltaic module, a kind of reflection gain type high transmittance solar cell back membrane and its preparation method provided in CN108767042B are provided.The reflection gain type high transmittance solar cell back membrane combines transparent film layer and high reflectivity pattern layer, can ensure that in solar cell coverage area, the average transmittance of 380-1280nm visible light and near infrared light is >90%;And in solar cell non-coverage area, the average reflectivity of 380-1280nm visible light and near infrared light is >90%, so the power generation power gain of the module made of the solar cell back membrane can reach 5-6W.However, the existing reflection gain type high transmittance solar cell back membrane still has the following defects: since its high reflectivity pattern layer is arranged on the upper surface and / or lower surface of the transparent film layer, and the high reflectivity pattern layer is grid-shaped, for the solar cell coverage area, the upper surface and / or lower surface of the transparent film layer does not have the high reflectivity pattern layer;And for the solar cell non-coverage area, the upper surface and / or lower surface of the transparent film layer has the high reflectivity pattern layer, so that the upper surface and / or lower surface of the transparent film layer will be uneven due to the existence of the grid-shaped high reflectivity pattern layer, thereby causing the upper surface and / or lower surface of the solar cell back membrane to be uneven.In the process of preparing photovoltaic module, when solar cell and solar cell back membrane with uneven surface are stacked and laminated, the cell piece is prone to breakage problem.Moreover, the more the number of high reflectivity pattern layers, the more serious the cell piece breakage problem, so as to reduce the yield of photovoltaic module and increase the production cost.In addition, since the high reflectivity pattern layer in the solar cell back membrane is protruding, the high reflectivity pattern layer will contact the second encapsulation adhesive film during the laminating process of photovoltaic module, and the grid delamination phenomenon is easy to occur, which affects the light reflection effect of the high reflectivity pattern layer. SUMMARY

[0005] The utility model discloses a kind of reflective grid photovoltaic back sheets and photovoltaic modules to overcome the deficiencies of prior art.

[0006] Based on this, the utility model discloses a kind of reflective grid photovoltaic back sheets, including transparent substrate layer, reflective pattern layer and first transparent functional layer;The reflective pattern layer is located on the upper surface and / or lower surface of the transparent substrate layer, and reflective pattern layer is grid-shaped;

[0007] The first transparent functional layer is filled in the mesh of the reflective pattern layer, so that the first transparent functional layer can be located on the upper surface and / or lower surface of the transparent substrate layer through the mesh;The thickness of the first transparent functional layer is greater than or equal to the thickness of the reflective pattern layer, so that the outer surface of the first transparent functional layer away from the transparent substrate layer is not lower than the outer surface of the reflective pattern layer away from the transparent substrate layer.

[0008] Preferably, the first transparent functional layer is a weather-resistant coating or a weather-resistant film material bonded by an adhesive, and the thickness of the first transparent functional layer is 1-50 μm.

[0009] Preferably, the thickness of the light-reflecting pattern layer is 1-25 μm; and the light-reflecting pattern layer is a plasmonic-enhanced layered structure.

[0010] Further preferably, the light-reflecting pattern layer is a light-reflecting coating; or the light-reflecting pattern layer is a light-reflecting film material bonded by an adhesive, and the light-reflecting film material is a polymer film and / or a metal film with a reflectivity of 60-99% for light with a wavelength of 300-1250 nm.

[0011] Preferably, the light-reflecting grid photovoltaic backsheet comprises one, two or more light-reflecting pattern layers; and the light-reflecting pattern layer is a white, black or other color light-reflecting layer.

[0012] Preferably, the surface of the light-reflecting pattern layer is further provided with a concave-convex structure for diffuse reflection of light; and the concave-convex structure is in the form of microspheres or cubic corner microprisms.

[0013] Preferably, the mesh positions of the grid are the same as the positions of the cell pieces, and the area of the mesh is smaller than the area of the cell pieces.

[0014] The edge of the mesh extends inwardly along the outer periphery of the cell pieces by 1-15 mm; and the four corners of the mesh are chamfered.

[0015] Preferably, the thickness of the transparent substrate layer is 100-500 μm.

[0016] The transparent substrate layer has a transmittance of 60-99% for light with a wavelength of 300-1250 nm; and the transparent substrate layer is a polyethylene terephthalate film material, a polybutylene terephthalate film material, a polyethylene naphthalate film material, a polyolefin film material, a polyamide film material, a polyimide film material, a polyurea film material, a polycarbonate film material, a polyacrylate derivative film material, a polyvinyl fluoride film material, a polyvinylidene fluoride film material, a polytrifluoroethylene film material or a polytetrafluoroethylene film material.

[0017] Preferably, when the light-reflecting pattern layer and the first transparent functional layer are both provided on one surface of the transparent substrate layer, the other surface of the transparent substrate layer is further provided with a second transparent functional layer.

[0018] The second transparent functional layer is a weather-resistant coating or a weather-resistant film material bonded by an adhesive, and the thickness of the second transparent functional layer is 5-30 μm.

[0019] The utility model discloses a photovoltaic module, including photovoltaic front plate, first encapsulation adhesive film, solar cell, second encapsulation adhesive film and photovoltaic backboard that are arranged in order from top to bottom and are laminated, the photovoltaic backboard is a kind of reflective grid photovoltaic backboard of the utility model content above-mentioned.

[0020] Compared with the prior art, the utility model at least includes the following beneficial effects:

[0021] The reflective grid photovoltaic backboard of the utility model, through the cooperation of the transparent substrate layer, the first transparent functional layer and the reflective pattern layer, after being applied to the photovoltaic module, can ensure that the average transmittance of visible light and near-infrared light of 380-1280nm is >90% in the solar cell coverage area, and can ensure that the average reflectivity of visible light and near-infrared light of 380-1280nm is >90% in the solar cell non-coverage area, and can effectively avoid the cell piece fragmentation problem caused by the surface uneven solar cell back film and solar cell during laminating, so as to greatly improve the cell piece fragmentation problem, greatly improve the yield of the photovoltaic module, and reduce the production cost, and the reflective pattern layer in the reflective grid photovoltaic backboard does not protrude during the laminating process of the photovoltaic module, and the contact between the reflective pattern layer and the second encapsulation adhesive film is reduced, the grid delamination phenomenon does not occur, and the high light reflection effect can be ensured for a long time.

[0022] In addition, through the cooperation of the first transparent functional layer and the reflective pattern layer, the thickness of the reflective grid photovoltaic backboard can be thinned, the use amount of raw materials such as the first transparent functional layer can be reduced, and the cost can be further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a cross-sectional structure schematic view of a reflective grid photovoltaic backboard of the embodiment.

[0024] Figure 2 It is a local installation structure schematic view of the reflective pattern layer and the cell piece.

[0025] Figure 3 It is a cross-sectional structure schematic view of the reflective pattern layer after local amplification. Figure 3 The concave-convex structure in (a) is microspherical, Figure 3 The concave-convex structure in (b) is cubic corner micro-prism type.

[0026] Figure 4 It is a cross-sectional structure schematic view of another reflective grid photovoltaic backboard of the embodiment.

[0027] Figure 5 It is a cross-sectional structure schematic view of another reflective grid photovoltaic backboard of the embodiment.

[0028] Explanation of reference numerals: transparent substrate layer 1; light-reflecting pattern layer 2; mesh 21; inner extension area 211; chamfer 22; concave-convex structure 23; first transparent functional layer 3; adhesive 4; second transparent functional layer 5; battery piece 6. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easily understood, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0030] EMBODIMENT

[0031] The photovoltaic module of the embodiment comprises, from top to bottom, a photovoltaic front plate, a first encapsulating adhesive film, a solar cell, a second encapsulating adhesive film and a photovoltaic back plate.

[0032] The solar cell comprises a plurality of battery pieces connected in series and / or in parallel. In practice, the battery pieces are preferably double-sided power generation battery pieces, so that the double-sided power generation battery pieces can fully absorb sunlight from the front side (i.e. the top) and the back side (i.e. the bottom) and convert the absorbed sunlight into electrical energy to provide clean electrical energy for electrical equipment. The photovoltaic front plate, the first encapsulating adhesive film, the solar cell and the second encapsulating adhesive film in the photovoltaic module of the embodiment are specifically described with reference to the prior art, and thus will not be described here.

[0033] The photovoltaic back plate is a light-reflecting mesh photovoltaic back plate as shown in the following embodiment:

[0034] The light-reflecting mesh photovoltaic back plate of the embodiment, as shown in Figure 1 、 4 -5, comprises a transparent substrate layer 1, a light-reflecting pattern layer 2 and a first transparent functional layer 3.

[0035] The transparent substrate layer 1 has a transmittance of 60-99% for light with a wavelength of 300 nm-1250 nm. In practice, the transparent substrate layer 1 is a polyethylene terephthalate film material, a polybutylene terephthalate film material, a polyethylene naphthalate film material, a polyolefin film material, a polyamide film material, a polyimide film material, a polyurea film material, a polycarbonate film material, a polyacrylate derivative film material, a polyvinyl fluoride film material, a polyvinylidene fluoride film material, a polytrifluoroethylene film material or a polytetrafluoroethylene film material. The transparent substrate layer 1 is preferably a polyethylene terephthalate film material.

[0036] Specifically, the thickness of the transparent substrate layer 1 is 100-500 μm, preferably 150-350 μm (e.g. 150 μm, 180 μm, 250 μm, 265 μm, 275 μm, 300 μm or 350 μm). Under the preferred thickness, the transparent substrate layer 1 can maintain good mechanical properties, play a good barrier role and have good light transmittance.

[0037] The reflective pattern layer 2 is disposed on the upper surface and / or lower surface of the transparent substrate layer 1. In this embodiment of a reflective grid photovoltaic backsheet, one, two, or more layers of the reflective pattern layer 2 can be disposed. Therefore, this embodiment of a reflective grid photovoltaic backsheet has the following three selectable examples:

[0038] Example 1: Reflective pattern layer 2 is disposed on the upper surface of transparent substrate layer 1 (e.g., Figure 1 , 4 As shown in Figure 5, the reflective pattern layer 2 is in contact with the upper surface of the transparent substrate layer 1.

[0039] Example 2: The reflective pattern layer 2 is disposed on the lower surface of the transparent substrate layer 1.

[0040] Example 3: The reflective grid photovoltaic backsheet has at least two reflective pattern layers 2, one of which is disposed on the upper surface of the transparent substrate layer 1, and the other is disposed on the lower surface of the transparent substrate layer 1.

[0041] When a total of multiple reflective pattern layers 2 are set in the reflective grid photovoltaic backsheet, the reflective grid photovoltaic backsheet can obtain a higher light reflectivity, so that more sunlight passing through the cells and the cell strings can be reflected back to the cell surface and reabsorbed and utilized by the cells, which helps to further improve the power generation of bifacial photovoltaic modules.

[0042] Specifically, see Figure 2 The reflective pattern layer 2 is grid-shaped, and the mesh openings 21 are located at the same positions as the battery cell 6, which facilitates the alignment of the battery cell 6 during encapsulation. The area of ​​the mesh openings 21 is smaller than the area of ​​the battery cell 6 to ensure that the battery cell 6 completely covers the mesh openings 21, and that light is reflected back to the surface of the battery cell 6 to the maximum extent without side leakage.

[0043] Further, see Figure 2 The four corners of the mesh 21 are chamfered 22. The edges of the mesh 21 extend inward along the outer periphery of the battery cell 6 to form a shape like... Figure 2 The inner extension region 211 shown has a length of 1-15 mm, preferably 3-8 mm, and more preferably 4 mm. Figure 2 (Inner extension area 211). Because the layouts of photovoltaic modules from different manufacturers are currently inconsistent, especially the spacing between cells and strings, which is generally between 1-5mm, and because there is no precise alignment process during photovoltaic module layout, the reflective area of ​​the reflective pattern layer 2 needs to have a certain margin of error. Within the preferred range of 3-8mm, the reflective area of ​​the reflective pattern layer 2 can be applied to different photovoltaic module layouts and ensures that all cells and strings have high reflectivity after the photovoltaic module is manufactured.

[0044] Specifically, the thickness of the light-reflecting pattern layer 2 is 1-100 μm, preferably 1-25 μm (e.g. 1 μm, 2 μm, 5 μm, 10 μm, 12 μm, 15 μm, 20 μm or 25 μm); under the preferred thickness, the light-reflecting pattern layer 2 can ensure good reflection performance and also meet the performance requirements such as weather resistance. The light-reflecting pattern layer 2 is preferably a plasmonic-enhanced layered structure to improve the adhesion performance of the surface of the light-reflecting pattern layer 2.

[0045] In one example of the embodiment, as shown in Figure 1 , 4 -5, the light-reflecting pattern layer 2 is a light-reflecting coating (e.g. a light-reflecting fluorine-containing coating or a light-reflecting fluorine-free coating), and at this time, the light-reflecting coating can be provided on the surface of the transparent substrate layer 1 in a partial area by means of screen printing.

[0046] In another example of the embodiment, the light-reflecting pattern layer 2 is a light-reflecting film material adhered by an adhesive, and the light-reflecting film material is a polymer film and / or a metal film with a reflectivity of 60-99% to light with a wavelength of 300-1250 nm.

[0047] In the embodiment, the light-reflecting pattern layer 2 can be white, black or other colors to meet different aesthetics and meet the market individualization needs.

[0048] Further, referring to Figure 3 , the surface of the light-reflecting pattern layer 2 is also provided with a concave-convex structure 23 to enhance the diffuse reflection of light and further improve the high light reflection effect of the light-reflecting pattern layer 2. Preferably, the concave-convex structure 23 is in the form of a microsphere (e.g. as shown in Figure 3 (a)), or the concave-convex structure 23 is in the form of a cubic corner micro-prism (e.g. as shown in Figure 3 (b)).

[0049] In the embodiment, the first transparent functional layer 3 is filled in the mesh hole 21 of the light-reflecting pattern layer 2, so that the first transparent functional layer 3 can pass through the mesh hole 21 to be provided on the upper surface and / or the lower surface of the transparent substrate layer 1 in a partial area (e.g. as shown in Figure 1 , 4 -5).

[0050] Further, the thickness of the first transparent functional layer 3 is greater than the thickness of the light-reflecting pattern layer 2 (e.g. as shown in Figure 1 , 5 ), so that the outer surface of the first transparent functional layer 3 away from the transparent substrate layer 1 (i.e. the upper surface of the first transparent functional layer 3 as shown in Figure 1 , 4 -5) is higher than the outer surface of the light-reflecting pattern layer 2 away from the transparent substrate layer 1 (i.e. as shown in Figure 1 , 4-5 shows the upper surface of the reflective pattern layer 2. In this case, the upper surface of the first transparent functional layer 3 is a continuous surface; or the thickness of the first transparent functional layer 3 is equal to the thickness of the reflective pattern layer 2 (e.g., Figure 4 As shown in the figure, the upper surface of the first transparent functional layer 3 is flush with the upper surface of the reflective pattern layer 2. In this way, obvious unevenness can be effectively avoided on the upper and / or lower surfaces of the reflective grid photovoltaic backsheet.

[0051] Therefore, the reflective grid photovoltaic backsheet of this embodiment, through the cooperation of the transparent substrate layer 1, the first transparent functional layer 3, and the reflective pattern layer 2, ensures that when applied to a photovoltaic module, the average transmittance of visible and near-infrared light in the 380-1280nm range is >90% in the area covered by the solar cell, and the average reflectance of visible and near-infrared light in the 380-1280nm range is >90% in the area not covered by the solar cell. It also effectively avoids the cell fragmentation problem caused by the uneven surface of the solar cell backsheet as shown in CN108767042B during the lamination of the solar cells, thus greatly improving the cell fragmentation problem, significantly increasing the yield of photovoltaic modules, and reducing production costs. Furthermore, during the photovoltaic module lamination process, the reflective pattern layer 2 in the reflective grid photovoltaic backsheet does not protrude, reducing the contact between the reflective pattern layer 2 and the second encapsulating film, preventing grid delamination, and ensuring long-term high light reflection. Furthermore, by combining the first transparent functional layer 3 with the reflective pattern layer 2, the thickness of the reflective grid photovoltaic backsheet can be reduced, thereby reducing the amount of raw materials used, such as the first transparent functional layer 3, and further reducing costs.

[0052] Specifically, the thickness of the first transparent functional layer 3 is 1-50 μm (e.g., 30 μm, 35 μm, 40 μm, 45 μm, or 50 μm). In one example of this embodiment, the first transparent functional layer 3 is a weather-resistant coating (e.g., Figure 1 , 4 (As shown in Figure 5), at this time, the weather-resistant coating can be filled into the mesh 21 by screen printing. In another example of this embodiment, the first transparent functional layer 3 is a weather-resistant film material bonded by an adhesive. In this case, an adhesive is needed to adhere the weather-resistant film material to a local area on the surface of the transparent substrate layer 1.

[0053] Furthermore, such as Figure 1 , 4 As shown in Figure -5, when both the reflective pattern layer 2 and the first transparent functional layer 3 are only disposed on one surface (such as the upper surface) of the transparent substrate layer 1, a second transparent functional layer 5 is also disposed on the other surface (i.e., the lower surface) of the transparent substrate layer 1. In one example of this embodiment, the second transparent functional layer 5 is a weather-resistant coating (such as...). Figure 1In another example of the present embodiment, the second transparent functional layer 5 is a weather-resistant film material (such as Figures 4-5 In this case, the second transparent functional layer 5 needs to be adhered to the surface of the transparent substrate layer 1 by means of the adhesive 4.

[0054] The thickness of the second transparent functional layer 5 is 5-30 μm, preferably 10-20 μm (such as 10 μm, 12 μm, 15 μm or 20 μm); at this preferred thickness, the second transparent functional layer 5 can not only protect the transparent substrate layer 1 well, but also ensure that the service life of the photovoltaic module can reach more than 25 years after the reflective grid photovoltaic backsheet of the present embodiment is applied to the photovoltaic module.

[0055] The transmittance of the first transparent functional layer 3 and the second transparent functional layer 5 to light with a wavelength of 300 nm-1250 nm is 60-100%, so as to ensure good light transmittance. In practice, the first transparent functional layer 3 and the second transparent functional layer 5 can be weather-resistant layers with or without fluorine, and are preferably weather-resistant layers with fluorine, so as to improve the weather resistance of the reflective grid photovoltaic backsheet.

[0056] Although the preferred embodiments of the present embodiment have been described, those skilled in the art can make further changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present embodiment.

[0057] The above describes the technical solutions provided by the present embodiment in detail, and the principles and implementation manners of the present embodiment are described by applying specific examples; the above description of the embodiments is only used to help understand the method of the present embodiment and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present embodiment; in conclusion, the content of the present description should not be understood as a limitation of the present embodiment.

Claims

1. A reflective grid photovoltaic backsheet, characterized by, The light-reflecting grid photovoltaic backboard comprises a transparent substrate layer, a light-reflecting pattern layer and a first transparent functional layer; the light-reflecting pattern layer is arranged on the upper surface and / or lower surface of the transparent substrate layer, and the light-reflecting pattern layer is in a grid shape; The first transparent functional layer is arranged in the mesh of the light-reflecting pattern layer, so that the first transparent functional layer can be arranged on the partial area of the upper surface and / or lower surface of the transparent substrate layer through the mesh; the thickness of the first transparent functional layer is greater than or equal to the thickness of the light-reflecting pattern layer, so that the outer surface of the first transparent functional layer away from the transparent substrate layer is not lower than the outer surface of the light-reflecting pattern layer away from the transparent substrate layer.

2. The reflective grid photovoltaic backsheet of claim 1, wherein, The first transparent functional layer is a weather-resistant coating or a weather-resistant film material bonded by an adhesive, and the thickness of the first transparent functional layer is 1-50 μm.

3. The light-reflecting grid photovoltaic backsheet of claim 1, wherein, The thickness of the light-reflecting pattern layer is 1-25 μm; the light-reflecting pattern layer is a plasmonic-enhanced layered structure.

4. The reflective grid photovoltaic backsheet of claim 1 or 3, wherein, The light-reflecting pattern layer is a light-reflecting coating; or the light-reflecting pattern layer is a light-reflecting film material bonded by an adhesive, and the light-reflecting film material is a polymer film and / or a metal film with a reflectivity of 60-99% to light with a wavelength of 300-1250 nm.

5. The light-reflecting grid photovoltaic backsheet of claim 1, wherein, The light-reflecting grid photovoltaic backboard comprises a transparent substrate layer, a light-reflecting pattern layer and a first transparent functional layer; the light-reflecting pattern layer is arranged on the upper surface and / or lower surface of the transparent substrate layer, and the light-reflecting pattern layer is in a grid shape; 6. The light-reflecting grid photovoltaic backsheet of claim 1, wherein, The surface of the light-reflecting pattern layer is further provided with a concave-convex structure for diffuse reflection of light; the concave-convex structure is in a microsphere type or a cubic corner micro-prism type.

7. The light-reflecting grid photovoltaic backsheet of claim 1, wherein, The mesh position of the grid is the same as the position of the cell piece, and the area of the mesh is smaller than the area of the cell piece; The edge of the mesh extends inwardly along the outer periphery of the cell piece by 1-15 mm; the four corners of the mesh are chamfered.

8. The light-reflecting grid photovoltaic backsheet of claim 1, wherein, The thickness of the transparent substrate layer is 100-500 μm; The transparent substrate layer has a transmittance of 60-99% to light with a wavelength of 300-1250 nm; the transparent substrate layer is a polyethylene terephthalate film material, a polybutylene terephthalate film material, a polyethylene naphthalate film material, a polyolefin film material, a polyamide film material, a polyimide film material, a polyurea film material, a polycarbonate film material, a polyacrylate derivative film material, a polyvinyl fluoride film material, a polyvinylidene fluoride film material, a polytrifluoroethylene film material or a polytetrafluoroethylene film material.

9. The light-reflecting grid photovoltaic backsheet of claim 1, wherein, When the light-reflecting pattern layer and the first transparent functional layer are both arranged on one surface of the transparent substrate layer, the other surface of the transparent substrate layer is further provided with a second transparent functional layer; The second transparent functional layer is a weather-resistant coating or a weather-resistant film material bonded by an adhesive, and the thickness of the second transparent functional layer is 5-30 μm.

10. A photovoltaic module, characterized by, The light-reflecting grid photovoltaic backboard comprises a photovoltaic front board, a first encapsulating adhesive film, a solar cell, a second encapsulating adhesive film and a photovoltaic backboard arranged in sequence from top to bottom; the photovoltaic backboard is a light-reflecting grid photovoltaic backboard according to any one of claims 1-9.

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