Light conversion composite film, its preparation method and photovoltaic module

Abstract

The present application provides a light conversion composite film, a preparation method thereof, and a photovoltaic module. The light conversion composite film includes a light conversion layer and an organic anti-transfer layer located on at least one side of the light conversion layer. By providing the organic anti-transfer layer, the present application inhibits the migration and precipitation of the light conversion agent from the light conversion layer, thereby improving the light conversion life of the light conversion layer and the UV weather resistance of the photovoltaic module.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic modules, and particularly to a light conversion composite film, a preparation method thereof, and a photovoltaic module. Background Art

[0002] A solar cell is a device that directly converts light energy into electrical energy through the photovoltaic effect or the photochemical effect. Among them, the heterojunction (HJT) cell has a relatively high theoretical limit efficiency. However, the HJT cell is sensitive to ultraviolet light (UV), and power attenuation is likely to occur under the action of ultraviolet light. In traditional technologies, a light conversion adhesive film is used to solve the ultraviolet attenuation of HJT modules. For example, the UV light conversion agent in the light conversion adhesive film is used to convert the light in the ultraviolet band into visible light, so as to inhibit the ultraviolet light from reaching the surface of the HJT cell sheet, thereby reducing the impact on the power of the cell. At present, when the existing light conversion agents are used, there are problems of poor compatibility with the adhesive film and easy migration to the surface for precipitation, which seriously affects the light conversion effect and service life of the adhesive film. Summary of the Invention

[0003] Based on this, it is necessary to provide a light conversion composite film, a preparation method thereof, and a photovoltaic module, which can inhibit the migration and precipitation of the light conversion agent from the light conversion layer by setting an organic anti-migration layer, thereby improving the light conversion service life of the light conversion layer.

[0004] In a first aspect, the present application provides a light conversion composite film, which includes a light conversion layer and an organic anti-migration layer located on at least one side of the light conversion layer.

[0005] In some embodiments, the material of the organic anti-migration layer includes polymethyl methacrylate.

[0006] In some embodiments, the thickness of the organic anti-migration layer is 20 μm to 100 μm.

[0007] In some embodiments, a coupling agent is dispersed in the organic anti-migration layer.

[0008] In some embodiments, the light conversion layer includes a substrate layer and a light conversion agent dispersed in the substrate layer, and the light conversion agent includes at least one of an organic light conversion agent, an inorganic light conversion agent, and a hybrid light conversion agent.

[0009] In some embodiments, the mass ratio of the light conversion agent in the substrate layer is 0.01% to 2%.

[0010] In some embodiments, the material of the substrate layer includes at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastomer, and polyethylene foam material.

[0011] In some embodiments, the light conversion agent includes at least one of an organic fluorescent material, a rare earth metal oxide, a rare earth metal organic complex, and a quantum dot.

[0012] In some embodiments, the thickness of the light conversion layer is 260 μm to 600 μm.

[0013] In some embodiments, at least one of an antioxidant and a light stabilizer is also dispersed in the light conversion layer.

[0014] In some embodiments, a bonding layer or a crosslinking layer is further provided on the surface of the organic anti-transfer layer away from the light conversion layer.

[0015] In a second aspect, the present application provides a method for preparing the light conversion composite film as described in the first aspect, and the preparation method includes:

[0016] Preparing and forming a light conversion layer;

[0017] Forming organic anti-transfer layers on the opposite two surfaces of the light conversion layer respectively.

[0018] In some embodiments, the preparation method of the organic anti-transfer layer includes at least one of a coating method and a deposition method.

[0019] In some embodiments, the organic anti-transfer layer is obtained by depositing polymethyl methacrylate particles.

[0020] In some embodiments, the diameter of the polymethyl methacrylate particles is 0.1 μm to 5 μm.

[0021] In a third aspect, the present application provides a photovoltaic module, and the photovoltaic module includes the light conversion composite film as described in the first aspect.

[0022] In some embodiments, the photovoltaic module includes a cell.

[0023] In the direction away from the surface of the cell, the light absorption side of the cell is sequentially stacked with the light conversion composite film and a first glass layer.

[0024] In the direction away from the surface of the cell, the backlight side of the cell is sequentially stacked with an encapsulant layer and a second glass layer.

[0025] Compared with the traditional technology, the present application has at least the following beneficial effects:

[0026] The present application provides an organic anti-transfer layer on the surface of the light conversion layer. The organic anti-transfer layer not only binds tightly to the light conversion layer, but also can inhibit the migration and precipitation of the light conversion agent in the light conversion layer, thereby prolonging the service life of the light conversion layer and improving the long-term UV weather resistance of the photovoltaic module. Description of the Drawings

[0027] Figure 1 This is a schematic structural diagram of a light conversion composite film provided in an embodiment of the present application.

[0028] Figure 2 This is another schematic structural diagram of a light conversion composite film provided in an embodiment of the present application.

[0029] Figure 3 This is another schematic structural diagram of a light conversion composite film provided in an embodiment of the present application.

[0030] Figure 4 This is a schematic structural diagram of a photovoltaic module provided in an embodiment of the present application.

[0031] Among them, 100 - photovoltaic module; 110 - first glass layer; 120 - light conversion composite film; 121 - light conversion layer; 122 - organic anti-transfer layer; 123 - adhesive layer; 124 - crosslinking layer; 130 - solar cell; 140 - encapsulant layer; 150 - second glass. Detailed implementation manners

[0032] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the understanding of the disclosure of the present invention is more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] In the present application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the distribution of the optional numerical values within the numerical interval is considered continuous and includes the two numerical endpoints (i.e., the minimum value and the maximum value) of the numerical interval, as well as each numerical value between these two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in the present application should be understood to include any and all sub-ranges subsumed therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" allows a broad inclusion of quantitative intervals such as percentage intervals, ratio intervals, and ratio value intervals.

[0035] In this application, "optionally", "optional", and "option" mean that it may or may not be present, that is, it refers to any one of the two alternative schemes of "present" or "absent". If "optional" appears multiple times in a technical solution, without special instructions, and without contradictions or mutual constraints, each "optional" is independent of each other.

[0036] In this application, in "the first aspect", "the second aspect", "the third aspect", etc., the terms "first", "second", "third", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can it be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", etc. only serve the purpose of non-exhaustive enumerative description and should be understood not to constitute a closed limitation on quantity.

[0037] In traditional technologies, light conversion agents are divided into organic light conversion agents, inorganic light conversion agents, and hybrid light conversion agents. Among them, organic light conversion agents have poor weather resistance, while both inorganic light conversion agents and hybrid light conversion agents have poor compatibility with the film and are prone to migrate to the surface and precipitate, thus affecting the light conversion effect and lifespan of the film. In this application, organic anti-migration layers are provided on the opposite surfaces of the light conversion layer, and the organic anti-migration layers can effectively inhibit the migration and precipitation of the light conversion agent in the light conversion layer, extend the service life of the light conversion composite film, and further improve the long-term UV weather resistance of the photovoltaic module.

[0038] The first aspect of this application provides a light conversion composite film 120, as Figure 1 shown, the light conversion composite film 120 includes a light conversion layer 121 and an organic anti-migration layer 122 located on at least one side of the light conversion layer 121.

[0039] In this application, an organic anti-migration layer 122 is provided on the surface of the light conversion layer 121. The organic anti-migration layer 122 not only binds tightly to the light conversion layer 121, but also can inhibit the migration and precipitation of the light conversion agent in the light conversion layer 121, thereby extending the service life of the light conversion layer 121 and improving the long-term UV weather resistance of the photovoltaic module.

[0040] It should be noted that the light conversion layer 121 in this application can be a material layer that can convert ultraviolet light into visible light. The organic anti-migration layer 122 in this application refers to an organic material layer that prevents material migration.

[0041] In some embodiments, the material of the organic anti-migration layer 122 includes polymethyl methacrylate.

[0042] This application uses an organic material as the material of the anti-migration layer, so the introduced organic anti-migration layer 122 has a poor bonding effect with the layered structure in the photovoltaic module. And it is preferably polymethyl methacrylate, which has good light transmittance and stability, and also has advantages such as low cost and easy processing.

[0043] In some embodiments, the thickness of the organic anti-transfer layer 122 is 20 μm to 100 μm. For example, it can be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm.

[0044] This application controls the thickness of the organic anti-transfer layer 122, so as to avoid excessive thickness of the light conversion composite film 120 and affect the light transmittance while ensuring good anti-transfer effect.

[0045] In some embodiments, a coupling agent is dispersed in the organic anti-transfer layer 122.

[0046] In this application, a coupling agent is dispersed in the organic anti-migration layer, and the coupling agent can improve the bonding force between the organic anti-transfer layer 122 and other material layers.

[0047] In some embodiments, the coupling agent includes a silane coupling agent, for example, it can be at least one of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri-tert-butylperoxysilane, vinyltriacetoxysilane, and vinyltri(β-methoxyethoxy)silane.

[0048] In some embodiments, the mass ratio of the coupling agent in the organic anti-transfer layer 122 is 0.2% to 5%, for example, it can be 0.2%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, or 5.0%.

[0049] In some embodiments, the light conversion layer 121 includes a substrate layer and a light conversion agent dispersed in the substrate layer, and the light conversion agent includes at least one of an organic light conversion agent, an inorganic light conversion agent, and a hybrid light conversion agent.

[0050] In some embodiments, the mass ratio of the light conversion agent in the substrate layer is 0.01% to 2%, for example, it can be 0.01%, 0.05%, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, or 2.0%.

[0051] In some embodiments, the material of the substrate layer includes at least one of ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyolefin elastomer (POE), and polyethylene foam (EPE).

[0052] In some embodiments, the light conversion agent includes at least one of an organic fluorescent material, a rare earth metal oxide, a rare earth metal organic complex, and a quantum dot. For example, it can be an organic compound with a large conjugated group such as stilbenyl bisbenzoxazole, 2,5-bis(5-tert-butyl-2-benzoxazolyl)thiophene, a rare earth metal oxide, a β-diketone of a rare earth metal, an organic carboxylic acid complex, a C quantum dot, a CdS quantum dot, a CdSe quantum dot, a CdTe quantum dot, a ZnS quantum dot, a ZnSe quantum dot, and a ZnTe quantum dot. The rare earth metal can be Y, Eu, Sr, Tb, Er, Yb, etc.

[0053] In some embodiments, the thickness of the light conversion layer 121 is 260 μm to 600 μm. For example, it can be 260 μm, 300 μm, 340 μm, 380 μm, 420 μm, 460 μm, 500 μm, 540 μm, 580 μm, or 600 μm.

[0054] In some embodiments, at least one of an antioxidant and a light stabilizer is also dispersed in the light conversion layer 121.

[0055] In this application, an antioxidant, a light stabilizer, etc. are added to the light conversion layer 121 to improve the stability and weather resistance of the light conversion layer 121.

[0056] In some embodiments, a bonding layer 123 or a crosslinking layer 124 is further provided on the surface of the organic anti-transfer layer 122 away from the light conversion layer 121.

[0057] In this application, a bonding layer 123 or a crosslinking layer 124 is provided on the surface of the organic anti-transfer layer 122, thereby improving the bonding stability of the light conversion composite film 120 with other film layers.

[0058] In some embodiments, as Figure 2 shown, the light conversion composite film 120 includes a light conversion layer 121, and organic anti-transfer layers 122 and bonding layers 123 are sequentially laminated on both side surfaces of the light conversion layer 121.

[0059] In some embodiments, as Figure 3 shown, the light conversion composite film 120 includes a light conversion layer 121, and organic anti-transfer layers 122 and crosslinking layers 124 are sequentially laminated on both side surfaces of the light conversion layer 121.

[0060] In some embodiments, the thickness of the bonding layer 123 is 50 μm to 200 μm. For example, it can be 50 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm, or 200 μm.

[0061] In some embodiments, the material of the adhesive layer 123 is the same as the matrix material of the light conversion layer 121. Optionally, the material of the adhesive layer 123 includes at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastomer, and polyethylene foam material.

[0062] In some embodiments, the thickness of the crosslinking layer 124 is 20 μm to 100 μm, for example, it can be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm.

[0063] In some embodiments, the crosslinking layer 124 includes a main body and a crosslinking agent dispersed in the main body. The material of the main body is the same as the matrix material of the light conversion layer 121. For example, the material of the main body can be at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastomer, and polyethylene foam material. The crosslinking agent includes at least one of triallyl isocyanurate, trimethylolpropane trimethacrylate, diethylene glycol dimethacrylate, cumene hydroperoxide, di-tert-butyl peroxide, diisopropylbenzene hydroperoxide, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, n-butyl 4,4-bis(tert-pentylperoxy)valerate, tert-butyl 2-ethylhexyl carbonate peroxide, and ethyl 3,3-bis(tert-butylperoxy)butyrate.

[0064] The second aspect of the present application provides a method for preparing the light conversion composite film 120 as described in the first aspect. The preparation method includes:

[0065] Prepare and form the light conversion layer 121;

[0066] Form organic anti-transfer layers 122 on the opposite two side surfaces of the light conversion layer 121 respectively.

[0067] In some embodiments, the preparation method of the organic anti-transfer layer 122 includes at least one of the coating method and the deposition method.

[0068] In some embodiments, the organic anti-transfer layer 122 is obtained by depositing polymethyl methacrylate particles.

[0069] In some embodiments, the preparation method of the organic anti-transfer layer 122 includes:

[0070] The light conversion layer 121 is placed in a solution containing PMMA particles, and the solvent in the solution is extracted. The PMMA particles are deposited on the surface of the light conversion layer 121 to form the organic anti-transfer layer 122. Optionally, the above replenishment is repeated to obtain organic anti-transfer layers 122 with different thicknesses.

[0071] In some embodiments, the diameter of the polymethyl methacrylate particles is 0.1 μm to 5 μm, and for example, it can be 0.1 μm, 0.2 μm, 0.5 μm, 1.0 μm, 1.5 μm, 2.0 μm, 2.5 μm, 3.0 μm, 3.5 μm, 4.0 μm, 4.5 μm or 5.0 μm.

[0072] This application controls the diameter of the polymethyl methacrylate particles, thereby adjusting the gap between the PMMA particles in the organic anti-transfer layer 122, further making the gap smaller than the particle size of the light conversion agent, and thus effectively preventing the migration and precipitation of the light conversion agent.

[0073] In some embodiments, the preparation method of the light conversion layer 121 includes:

[0074] Mixing a monomer of a substrate material, a crosslinking agent, an additive, and a light conversion agent to obtain a slurry, and coating and hot-pressing the slurry to obtain the light conversion layer 121. The additive includes at least one of a co-crosslinking agent, an antioxidant, a coupling agent, and a light stabilizer.

[0075] The third aspect of this application provides a photovoltaic module, which includes the light conversion composite film 120 as described in the first aspect.

[0076] In some embodiments, the photovoltaic module 100 includes a cell 130. Preferably, the cell 130 is an HJT cell.

[0077] As Figure 4 shown, along the direction away from the surface of the cell 130, the light absorption side of the cell 130 is sequentially stacked with the light conversion composite film 120 and a first glass layer 110.

[0078] Along the direction away from the surface of the cell 130, the backlight side of the cell 130 is sequentially stacked with an encapsulant layer 140 and a second glass layer 150.

[0079] In some embodiments, the thickness of the first glass layer 110 is 1 mm to 10 mm, and for example, it can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0080] In some embodiments, the thickness of the adhesive film layer 140 is 300 μm to 800 μm, and for example, it can be 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 550 μm, 600 μm, 650 μm, 700 μm, 750 μm or 800 μm. Optionally, the material of the adhesive film layer 140 includes at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastic material and polyethylene foam material.

[0081] In some embodiments, the thickness of the second glass 150 layer is 1 mm to 10 mm, and for example, it can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0082] The embodiments of the present invention will be described in detail below in conjunction with the embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. For the experimental methods without specific conditions in the following embodiments, the guidance given in the present invention is preferably referred to, and it can also be carried out according to the experimental manuals or conventional conditions in the art, or according to the conditions recommended by the manufacturers, or referring to the experimental methods known in the art.

[0083] Example 1

[0084] This embodiment provides a solar cell, including a cell 130, the cell 130 is an HJT cell, and a light conversion composite film 120 and a first glass layer 110 are sequentially stacked on the light absorption surface of the cell 130; a glue film layer 140 and a second glass 150 layer are sequentially stacked on the backlight surface of the cell 130.

[0085] Among them, the light conversion composite film 120 includes a light conversion layer 121 and organic anti-transfer layers 122 provided on both side surfaces of the light conversion layer 121. The base material layer of the light conversion layer 121 is an EVA material, and CdS quantum dot light conversion agents are dispersed therein. The mass ratio of the light conversion agent in the base material layer is 0.02%. The thickness of the light conversion layer 121 is 400 μm, and the thickness of the organic anti-transfer layer 122 is 20 μm. The thickness of the first glass layer 110 is 2 mm, the thickness of the second glass 150 layer is 2 mm, and the glue film layer 140 is a layer of ethylene-vinyl acetate copolymer material with a thickness of 440 μm.

[0086] The preparation method of the organic anti-transfer layer 122 includes:

[0087] Put the light conversion layer 121 into a solution containing PMMA particles, and extract the solvent in the solution. The PMMA particles are deposited on the surface of the light conversion layer 121 to form the organic anti-transfer layer 122, where the diameter of the PMMA particles is 1 μm.

[0088] Example 2

[0089] This example provides a solar cell. Compared with Example 1, the only difference is that the mass ratio of the light conversion agent in the substrate layer is 1%. The thickness of the light conversion layer 121 is 260 μm, the thickness of the organic anti-transfer layer 122 is 60 μm, the diameter of the PMMA particles is 5 μm, and a coupling agent is dispersed in the organic anti-transfer layer 122, and the mass ratio of the coupling agent in the organic anti-transfer layer 122 is 3%.

[0090] Example 3

[0091] This example provides a solar cell. Compared with Example 1, the only difference is that the mass ratio of the light conversion agent in the substrate layer is 2%. The thickness of the light conversion layer 121 is 600 μm, the thickness of the organic anti-transfer layer 122 is 100 μm, the diameter of the PMMA particles is 0.1 μm, and a bonding layer 123 is provided on the surface of the organic anti-transfer layer 122 away from the light conversion layer 121, and the bonding layer 123 is a layer of ethylene-vinyl acetate copolymer material with a thickness of 100 μm.

[0092] Example 4

[0093] This example provides a solar cell. Compared with Example 1, the only difference is that a crosslinking layer 124 is provided on the surface of the organic anti-transfer layer 122 away from the light conversion layer 121, the thickness of the crosslinking layer 124 is 60 μm, the main material is ethylene-vinyl acetate copolymer, and the crosslinking agent is triallyl isocyanurate.

[0094] Example 5

[0095] This example provides a solar cell. Compared with Example 1, the only difference is that the thickness of the anti-transfer layer is 10 μm.

[0096] Example 6

[0097] This example provides a solar cell. Compared with Example 1, the only difference is that the diameter of the PMMA particles is 7 μm.

[0098] Comparative Example 1

[0099] This example provides a solar cell. Compared with Example 1, the only difference is that the organic anti-transfer layer 122 is replaced with a PVDF material.

[0100] Comparative Example 2

[0101] This example provides a solar cell. Compared with Example 1, the only difference is that the organic anti-transfer layer 122 is replaced with a silica layer.

[0102] Comparative Example 3

[0103] This embodiment provides a solar cell. Compared with Embodiment 1, the only difference is that the organic anti-transfer layer 122 is not provided.

[0104] Perform performance tests on the solar cells prepared in the above embodiments and comparative examples. The test methods include:

[0105] Irradiate the solar module with ultraviolet (UV) light at an irradiation intensity of 120 W for 500 h, with a cumulative irradiation dose of 60 kWh. Measure the power attenuation of the solar module before and after UV irradiation. The power attenuation refers to the power change rate of the solar module after UV irradiation relative to before irradiation.

[0106] The test results are shown in Table 1.

[0107] Table 1

[0108]

[0109] It can be seen from the above table that:

[0110] (1) By comparing Embodiment 1 with Embodiment 5, it can be seen that the present application controls the thickness of the organic anti-transfer layer 122, so as to avoid the thickness of the light conversion composite film 120 being too large and affecting the size of the photovoltaic module while ensuring a good anti-transfer effect.

[0111] (2) By comparing Embodiment 1 with Embodiment 6, it can be seen that the present application controls the diameter of the polymethyl methacrylate particles, thereby adjusting the gap between the PMMA particles in the organic anti-transfer layer 122, and further making the gap smaller than the particle size of the light conversion agent, so as to effectively prevent the migration and precipitation of the light conversion agent.

[0112] (3) By comparing Embodiment 1 with Comparative Examples 1-3, it can be seen that the present application provides an organic anti-transfer layer 122 on the surface of the light conversion layer 121. The organic anti-transfer layer 122 not only binds tightly to the light conversion layer 121, but also can inhibit the migration and precipitation of the light conversion agent in the light conversion layer 121, thereby prolonging the service life of the light conversion layer 121 and improving the long-term UV weather resistance of the photovoltaic module.

[0113] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0114] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A light conversion composite film, characterized in that, the light conversion composite film comprises a light conversion layer and organic anti-transfer layers respectively located on both sides of the light conversion layer; the thickness of the organic anti-transfer layer is 20 μm to 100 μm, the material of the organic anti-transfer layer comprises polymethyl methacrylate particles, the diameter of the polymethyl methacrylate particles is 0.1 μm to 5 μm, the light conversion layer comprises a substrate layer and light conversion agents dispersed in the substrate layer, and the gap between each polymethyl methacrylate particle is smaller than the diameter of the light conversion agent.

2. The light conversion composite film according to claim 1, characterized in that, a coupling agent is dispersed in the organic anti-transfer layer.

3. The light conversion composite film according to claim 1, characterized in that, the light conversion agent comprises at least one of an organic light conversion agent, an inorganic light conversion agent and a hybrid light conversion agent.

4. The light conversion composite film according to claim 3, characterized in that, the light conversion layer satisfies at least one of the following conditions: (1) The mass ratio of the light conversion agent in the substrate layer is 0.01% to 2%; (2) The material of the substrate layer comprises at least one of ethylene-vinyl acetate copolymer, polyvinyl butyral, polyolefin elastomer and polyethylene foam material; (3) The light conversion agent comprises at least one of an organic fluorescent material, a rare earth metal oxide, a rare earth metal organic complex and a quantum dot; (4) The thickness of the light conversion layer is 260 μm to 600 μm; (5) At least one of an antioxidant and a light stabilizer is further dispersed in the light conversion layer.

5. The light conversion composite film according to any one of claims 1-4, characterized in that, a bonding layer or a crosslinking layer is further provided on the surface of the organic anti-transfer layer away from the light conversion layer.

6. A preparation method of the light conversion composite film according to any one of claims 1-5, characterized in that, the preparation method comprises: preparing and forming a light conversion layer; forming organic anti-transfer layers on the opposite two side surfaces of the light conversion layer respectively; the organic anti-transfer layer is obtained by depositing polymethyl methacrylate particles, and the diameter of the polymethyl methacrylate particles is 0.1 μm to 5 μm.

7. The preparation method according to claim 6, characterized in that, the preparation method of the organic anti-transfer layer comprises: putting the light conversion layer into a solution containing polymethyl methacrylate particles, and extracting the solvent in the solution to deposit the polymethyl methacrylate particles on the surface of the light conversion layer to form the organic anti-transfer layer.

8. A photovoltaic module, characterized in that, the photovoltaic module comprises the light conversion composite film according to any one of claims 1-5.

9. The photovoltaic module according to claim 8, characterized in that, the photovoltaic module comprises solar cells; along the direction away from the surface of the solar cells, a light absorption side of the solar cells is sequentially stacked with the light conversion composite film and a first glass layer; along the direction away from the surface of the solar cells, a backlight side of the solar cells is sequentially stacked with an adhesive film layer and a second glass layer.

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