A front plate of a photovoltaic module and a preparation method and application thereof

Abstract

The application provides a photovoltaic module front plate and a preparation method and application thereof, and the photovoltaic module front plate comprises a fluoroplastic film, a glass fiber adhesive film composite layer and a barrier layer which are sequentially stacked; the glass fiber adhesive film composite layer comprises a first cutting adhesive film, a glass fiber layer and a second cutting adhesive film which are sequentially stacked; and the fluoroplastic film is attached to the surface of the first cutting adhesive film away from the glass fiber layer. Through the design of the structure of the photovoltaic module front plate and the materials of each layer, the hardness of the photovoltaic module front plate is improved, the water vapor transmission rate and the potential induced degradation in the photovoltaic module are effectively reduced, the internal structure of the photovoltaic module is protected, and the service life is prolonged; in addition, the photovoltaic module front plate provided by the application has the characteristics of light weight, the weight of the photovoltaic module can be reduced, and the photovoltaic module is convenient to install and transport.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of photovoltaic modules, and particularly relates to a photovoltaic module front plate and a preparation method and application thereof. BACKGROUND

[0002] With the continuous growth of global energy demand and the increasing severity of environmental problems, solar photovoltaic technology as a clean and renewable energy has received widespread attention and rapid development. Photovoltaic modules are the core components of solar photovoltaic systems, and their performance and reliability directly affect the power generation efficiency and service life of the entire system. Photovoltaic modules are usually composed of front plates, photovoltaic cells, encapsulating materials, back plates, and other parts, and the selection of front plate materials has an important impact on the overall performance of the module.

[0003] The front plate material of traditional photovoltaic modules is mainly glass, because glass has excellent light transmittance and mechanical strength, and can protect photovoltaic cells from the influence of the external environment for a long time. However, glass as a front plate material also has some obvious defects: (1) heavy weight and high density, resulting in a large weight of the entire photovoltaic module, which not only increases the difficulty and cost of transportation and installation, but also brings a heavy burden to certain specific application scenarios (such as roof photovoltaic systems); (2) fragile, although glass has a certain strength, it is easy to break when impacted or subjected to extreme weather (such as hail, strong winds, etc.), thereby affecting the service life and reliability of the photovoltaic module; (3) high production energy consumption, the manufacturing process of glass requires high-temperature melting, which has high energy consumption and high production cost, and also brings a heavy environmental burden.

[0004] Based on the above problems, researchers and enterprises have been exploring and developing new photovoltaic module front plate materials, hoping to reduce weight, improve production efficiency and reduce environmental impact while maintaining or improving module performance. Lightweight, high efficiency, and environmentally friendly packaging materials have become a research hotspot. In recent years, some new materials and technologies have been introduced into the research of photovoltaic module front plates, such as glass fiber prepreg, organic glass, polycarbonate, and powder coating and its powdering technology. These materials have lighter weight than traditional glass, but their weather resistance and mechanical strength are relatively low, and they are prone to aging, yellowing, and brittle cracking during long-term use. For example, CN219789512U discloses a lightweight transparent combined front plate for photovoltaic module packaging, which is composed of a transparent film layer and a glass fiber resin infiltration layer through lamination. The material of the transparent film layer is PVDF or ETFE. The lightweight transparent combined front plate is a lightweight and high-weather-resistant high polymer material. The main body of the lightweight and high-weather-resistant high polymer material is a fluorine-containing polymer or a high-weather-resistant non-fluorine polymer, epoxy resin, etc. The solar cell module prepared using the lightweight transparent combined front plate is lightweight, easy to install and transport, but the overall strength is insufficient, the anti-hail performance is poor, and the service life of the photovoltaic module is affected. In addition, the ultraviolet blocking performance is insufficient, there is a large light-induced decay effect, resulting in low power generation of the module in the later stage. In addition, the module is prone to yellowing and cracking when used outdoors, and the water vapor transmission rate is too high, which is insufficient to protect the n-type battery module.

[0005] Existing lightweight photovoltaic modules directly use transparent back plates as front plates, greatly reducing the overall weight of the module. However, using transparent back plates as front plates has obvious light-induced decay effects on one hand, and the overall mechanical strength and weather resistance of the module are insufficient on the other hand, making it unable to be used in harsh environments such as hail, high temperature and humidity, strong ultraviolet light, etc. for a long time. Lightweight photovoltaic modules may face more obvious power decay during long-term use, with significant initial light-induced decay (Staebler-Wronski effect). This power decay will affect the long-term power generation and return on investment of the entire photovoltaic power generation system. Some special packaging materials used in lightweight photovoltaic modules may have poor stability in harsh environmental conditions. Organic photovoltaic materials are easily affected by oxygen and moisture, leading to performance degradation. In high temperature and humidity environments, the service life of organic photovoltaic modules may be significantly shortened, and their performance may deteriorate severely within a few years. Lightweight usually means some sacrifice in material thickness or structural strength, and such photovoltaic modules may have weak mechanical load resistance in terms of wind resistance, snow resistance, hail resistance, etc. In windy weather, lightweight photovoltaic panels are more prone to deformation or even damage.

[0006] Currently, the production process of light photovoltaic modules is often more complex, and the production efficiency is low. And due to its relatively small output, it cannot form the cost advantage of large-scale production. Therefore, it is urgent to develop a light photovoltaic module front plate that can not only maintain good performance but also solve the defects of the prior art. SUMMARY

[0007] In view of the shortcomings of the prior art, the purpose of the present application is to provide a photovoltaic module front plate and its preparation method and application. By designing the structure of the photovoltaic module front plate, not only the hardness of the photovoltaic module front plate is improved, but also the water vapor transmission rate and the internal potential induced decay of the photovoltaic module are effectively reduced, thereby protecting the internal structure of the photovoltaic module and prolonging its service life. Moreover, the photovoltaic module front plate is light and more environmentally friendly, which can reduce the weight of the photovoltaic module and make it easy to install and transport.

[0008] To achieve this purpose, the present application adopts the following technical solutions:

[0009] In the first aspect, the present application provides a photovoltaic module front plate, which comprises a fluoroplastic film, a glass fiber adhesive film composite layer and a barrier layer which are sequentially stacked. The glass fiber adhesive film composite layer comprises a first cutoff adhesive film, a glass fiber layer and a second cutoff adhesive film which are sequentially stacked. The fluoroplastic film is attached to the surface of the first cutoff adhesive film away from the glass fiber layer.

[0010] By designing the structure of the photovoltaic module front plate, not only the hardness of the photovoltaic module front plate is improved, but also the water vapor transmission rate and the internal potential induced decay of the photovoltaic module are effectively reduced, thereby protecting the internal structure of the photovoltaic module and prolonging its service life. The photovoltaic module front plate provided by the present application is light, which can reduce the weight of the photovoltaic module, facilitate installation and transportation, and meet the demand of photovoltaic power generation equipment manufacturers for lightweight products.

[0011] In the photovoltaic module front plate provided by the present application, the fluoroplastic film has excellent weather resistance, light transmission and mechanical strength, and its unique chemical stability can also enable the photovoltaic module to maintain long-term stability under various environmental conditions. The first cutoff adhesive film and the second cutoff adhesive film have good weather resistance, chemical resistance and ultraviolet resistance. The glass fiber layer can improve the overall strength of the photovoltaic module front plate, broaden the application field of the product, reduce energy consumption, prolong the service life of the photovoltaic module, and reduce the maintenance cost and performance decay risk caused by natural disasters. The glass fiber layer and the two layers of cutoff adhesive film form a unique sandwich structure of adhesive film sandwiching glass fiber. When facing hail weather, the high impact of hail on the photovoltaic module front plate can be dispersed and resisted by the high strength of the glass fiber layer, preventing the hail from directly penetrating the front plate and causing damage to the key components such as battery pieces and circuits inside the photovoltaic module, thereby improving the reliability and durability of the entire photovoltaic system.

[0012] The photovoltaic module front plate provided by the present application can be widely applied in the fields of material science and engineering, electronic engineering, and semiconductor manufacturing technology. Firstly, in the field of material science and engineering, the photovoltaic module front plate provided by the present application can solve the problem of attenuation of lightweight photovoltaic modules and improve the service life of the modules. At the same time, the photovoltaic module front plate has excellent ultraviolet resistance, hail resistance, and water vapor barrier properties, which can effectively protect the modules from the influence of the external environment and improve the performance and reliability of the photovoltaic modules. In the field of electronic engineering, the photovoltaic module front plate provided by the present application can be widely applied in the manufacturing of photovoltaic modules, which are the core components of photovoltaic power generation systems. Due to its lightweight and high-performance characteristics, it can provide more effective solar power generation solutions in applications such as rooftops and curtain walls, meeting the growing demand for clean energy. In the field of semiconductor manufacturing technology, the lightweight photovoltaic module front plate provided by the present application can promote the innovation and development of photovoltaic module manufacturing technology. In general, the photovoltaic module front plate provided by the present application has broad application prospects and market demand, and is expected to play an important role in the fields of material science and engineering, electronic engineering, and semiconductor manufacturing technology, promoting the technological progress and industrial development of related fields.

[0013] The following is a preferred technical solution of the present application, but not as a limitation on the technical solutions provided by the present application. Through the following preferred technical solution, the purpose and beneficial effects of the present application can be better achieved and realized.

[0014] As a preferred technical solution, the fluoroplastic film includes any one of a polyvinylidene fluoride film, a polyvinyl fluoride film, a fluorinated ethylene-propylene copolymer film, an ethylene-tetrafluoroethylene copolymer film, a THV film, or a polytrifluorochloroethylene film.

[0015] Preferably, the thickness of the fluoroplastic film is 20-200 μm, for example, it can be 25 μm, 30 μm, 40 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm, etc. This thickness range of the fluoroplastic film ensures sufficient strength while ensuring lightweight and good flexibility of the material.

[0016] Preferably, the light transmittance of the fluoroplastic film is ≥93%, for example, it can be 93.5%, 94%, 94.5%, 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, etc.

[0017] In the present application, the light transmittance is tested according to IEC 62788 by a spectrophotometer.

[0018] Preferably, the fluoroplastic film has an ultraviolet blocking rate ≥ 95%, such as 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, etc.

[0019] In the present application, the ultraviolet blocking rate is tested according to IEC 62788 by a spectrophotometer.

[0020] Preferably, the thickness of the first and second cut-off adhesive films is independently 0.4-0.8mm, such as 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, etc. The thickness distribution of the first and second cut-off adhesive films not only ensures the uniformity and compactness of the cut-off adhesive film, but also avoids the problem of reduced light transmittance due to excessive thickness.

[0021] Preferably, the grammage of the first and second cut-off adhesive films is independently 100-1000g / m 2 , such as 150g / m 2 , 200g / m 2 , 250g / m 2 , 300g / m 2 , 350g / m 2 , 400g / m 2 , 450g / m 2 , 500g / m 2 , 550g / m 2 , 600g / m 2 , 650g / m 2 , 700g / m 2 , 750g / m 2 , 800g / m 2 , 850g / m 2 , 900g / m 2 , 950g / m 2 , etc.

[0022] Preferably, the raw materials for preparing the first and second cut-off adhesive films independently comprise a combination of resin, curing agent and ultraviolet blocking agent.

[0023] Preferably, the resin comprises any one or a combination of at least two of polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer or polyvinyl butyral.

[0024] Preferably, the curing agent comprises any one or a combination of at least two of dicumyl peroxide, di-tert-butyl peroxide or triallyl isocyanurate.

[0025] Preferably, the ultraviolet blocking agent includes any one or a combination of at least two of 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chloro-benzotriazole, (2'-hydroxy-5'-methylphenyl)-benzotriazole, 2-cyano-3,3-diphenyl acrylate, ethylhexyl p-methoxycinnamate, 2-(4,6-diphenyl-1,3,5-triazine-2)-5-n-hexyloxyphenol, polysilicone, or 2-hydroxy-4-n-octyloxybenzophenone.

[0026] Preferably, the mass ratio of the resin to the curing agent is 100:(0.5-5), for example, can be 100:0.8, 100:1, 100:1.5, 100:1.8, 100:2, 100:2.5, 100:2.8, 100:3, 100:3.5, 100:3.8, 100:4, 100:4.5, 100:4.8, etc.

[0027] Preferably, the mass ratio of the resin to the ultraviolet blocking agent is 100:(0.1-2), for example, can be 100:0.2, 100:0.4, 100:0.6, 100:0.8, 100:1, 100:1.2, 100:1.4, 100:1.6, 100:1.8, etc.

[0028] Preferably, the first dicing film and the second dicing film each independently further include an auxiliary agent.

[0029] Preferably, the auxiliary agent includes any one or a combination of at least two of a light stabilizer, an antioxidant, a tackifying resin, or a lubricant.

[0030] Preferably, the antioxidant includes a phosphite antioxidant.

[0031] Preferably, the light stabilizer includes a hindered amine light stabilizer.

[0032] Preferably, the hindered amine light stabilizer includes bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate.

[0033] Preferably, the tackifying resin includes any one or a combination of at least two of a terpene resin, a hydrogenated rosin glycerin ester, a maleic anhydride grafted POE resin, or a petroleum resin.

[0034] Preferably, the lubricant includes paraffin oil.

[0035] Preferably, the mass ratio of the resin to the auxiliary agent is 100:(0.5-15), for example, it can be 100:1, 100:2, 100:3, 100:4, 100:5, 100:6, 100:7, 100:8, 100:9, 100:10, 100:11, 100:12, 100:13, 100:14, etc.

[0036] Preferably, the glass fiber layer has a grammage of 50-500 g / m 2 , for example, it can be 100 g / m 2 , 150 g / m 2 , 200 g / m 2 , 250 g / m 2 , 300 g / m 2 , 350 g / m 2 , 400 g / m 2 , 450 g / m 2 , etc.

[0037] Preferably, the glass fiber layer has a thickness of 0.2-1 mm, for example, it can be 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, etc.

[0038] Preferably, the barrier layer has a thickness of 0.05-0.5 mm, for example, it can be 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.35 mm, 0.38 mm, 0.4 mm, 0.42 mm, 0.45 mm, 0.48 mm, etc.

[0039] Preferably, the barrier layer comprises, in sequence, an ion migration prevention layer, a substrate layer, and a water barrier layer; the ion migration prevention layer is attached to the surface of the second cut-off adhesive film away from the glass fiber layer.

[0040] In the present application, the ion migration prevention layer can prevent ions from accumulating at the electrode and semiconductor interface of the photovoltaic cell piece, effectively block the migration of metal ions (such as sodium ions, potassium ions, etc.), and avoid the performance degradation of the cell piece caused by ion migration, such as reduced short-circuit current and reduced fill factor. The water barrier layer can prevent water vapor from penetrating into the interior of the assembly and causing damage. The barrier layer can improve the overall performance and reliability of the photovoltaic system, so that it can maintain good working condition under various complex environmental conditions.

[0041] Preferably, the material of the ion migration prevention layer comprises any one or a combination of at least two of PDMS-SiO2 hybrid material, silicon nitride, zirconium oxide, polyethylene oxide-based composite material or metal organic framework material, and further preferably PDMS-SiO2 hybrid material.

[0042] The PDMS-SiO2 hybrid material combines the flexibility of organic polysiloxane and the high barrier property and ion blocking ability of inorganic silicon dioxide, and has better ion blocking effect.

[0043] Preferably, the thickness of the ion migration prevention layer is 10-200 nm, for example, can be 20 nm, 40 nm, 60 nm, 80 nm, 100 nm, 120 nm, 140 nm, 160 nm, 180 nm, etc.

[0044] Preferably, the material of the substrate layer comprises any one or a combination of at least two of polyethylene terephthalate, polycarbonate or polyamide.

[0045] Preferably, the material of the water blocking layer comprises any one or a combination of at least two of aluminum oxide, silicon dioxide, silicon nitride, titanium dioxide, zinc oxide, silicon carbide or magnesium oxide.

[0046] The present application can keep the front plate of the photovoltaic module stable in various environments by designing the materials of each layer of the front plate of the photovoltaic module, thereby ensuring the high performance and long service life of the front plate of the photovoltaic module.

[0047] Preferably, the thickness of the water blocking layer is 10-200 nm, for example, can be 20 nm, 40 nm, 60 nm, 80 nm, 100 nm, 120 nm, 140 nm, 160 nm, 180 nm, etc. This thickness range of the water blocking layer ensures good water blocking performance while also ensuring the lightness and thinness of the material; its excellent water blocking performance can effectively prevent the intrusion of external water vapor and protect the integrity and stability of the internal structure of the package.

[0048] Preferably, the preparation method of the barrier layer comprises:

[0049] The ion migration prevention layer is compounded on one side of the substrate layer by a first method, and the water blocking layer is compounded on the other side of the substrate layer by a second method to obtain the barrier layer; the first method and the second method each independently comprises any one of magnetron sputtering, vacuum evaporation, atomic layer deposition or plasma enhanced chemical vapor deposition.

[0050] Preferably, the first method is vacuum evaporation.

[0051] Preferably, the temperature of the evaporation source in the vacuum evaporation is 150-300℃, for example, it can be 160℃, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, 230℃, 240℃, 250℃, 260℃, 270℃, 280℃, 290℃, etc.

[0052] Preferably, the vacuum degree of the vacuum evaporation is 10 -4 -10 -6 Torr.

[0053] Preferably, the deposition rate of the vacuum evaporation is 10-300nm / min, for example, it can be 20nm / min, 40nm / min, 60nm / min, 80nm / min, 100nm / min, 120nm / min, 140nm / min, 160nm / min, 180nm / min, 200nm / min, 220nm / min, 240nm / min, 260nm / min, 280nm / min, etc.

[0054] The present application can make the material of the ion migration prevention layer uniformly deposited on the surface of the substrate layer by controlling the temperature, vacuum degree and deposition rate of the evaporation source of the vacuum evaporation within a suitable range.

[0055] Preferably, the second method is magnetron sputtering.

[0056] Preferably, the sputtering power of the magnetron sputtering is 100-500W, for example, it can be 150W, 200W, 250W, 300W, 350W, 400W, 450W, etc.

[0057] Preferably, the argon flow of the magnetron sputtering is 20-100sccm, for example, it can be 30sccm, 40sccm, 50sccm, 60sccm, 70sccm, 80sccm, 90sccm, etc.

[0058] Preferably, the sputtering target material of the magnetron sputtering includes an aluminum target material.

[0059] Preferably, the time of the magnetron sputtering is 3-30min, for example, it can be 5min, 10min, 12min, 15min, 18min, 20min, 22min, 25min, 28min, etc.

[0060] The present application can control the quality and thickness of the water barrier layer by adjusting the sputtering power, argon flow, sputtering time and other parameters.

[0061] In the second aspect, the present application provides a preparation method of the front plate of the photovoltaic module as described in the first aspect, and the preparation method comprises the following steps:

[0062] (1) laminating the first cut-off adhesive film, the glass fiber layer, and the second cut-off adhesive film to perform first thermal compounding to obtain a glass fiber adhesive film composite layer;

[0063] (2) performing second thermal compounding between the surface of the first cut-off adhesive film away from the glass fiber layer and a fluoroplastic film, and performing third thermal compounding between the surface of the second cut-off adhesive film away from the glass fiber layer and a barrier layer to obtain the front plate of the photovoltaic module.

[0064] The second thermal compounding and the third thermal compounding in the above step (2) are not in a specific order.

[0065] The preparation method of the front plate of the photovoltaic module provided by the application can solve the problems of complex production process and low production efficiency of the existing lightweight photovoltaic module packaging material. At the same time, due to the excellent manufacturing process and cost advantage, large-scale production can be realized, production cost can be reduced, and market competitiveness can be improved. By improving the production process and performance of the front plate of the photovoltaic module, the overall manufacturing level of the photovoltaic module can be improved, and the progress and development of the solar energy industry can be promoted.

[0066] The application combines the fluoroplastic film and the barrier layer with the glass fiber adhesive film composite layer through thermal compounding technology, which makes the manufacturing of the front plate of the photovoltaic module simpler, and improves the stability, durability and reliability of the front plate of the photovoltaic module.

[0067] Preferably, the preparation method of the first cut-off adhesive film comprises: melt extruding the raw material of the first cut-off adhesive film to obtain the first cut-off adhesive film; and the preparation method of the second cut-off adhesive film comprises: melt extruding the raw material of the second cut-off adhesive film to obtain the second cut-off adhesive film.

[0068] Preferably, the first thermal compounding is performed when the first cut-off adhesive film and the second cut-off adhesive film are in a molten state after being extruded.

[0069] Preferably, the melt extrusion is performed by a double screw extruder.

[0070] Preferably, the screw diameter of the double screw extruder is 20-150 mm, for example, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, etc.

[0071] Preferably, the length-diameter ratio of the screw of the double screw extruder is (10-50):1, for example, 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, etc.

[0072] Preferably, the temperature of the melt extrusion is 80-120℃, for example, it can be 82℃, 85℃, 88℃, 90℃, 92℃, 95℃, 98℃, 100℃, 102℃, 105℃, 108℃, 110℃, 112℃, 115℃, 118℃, etc.

[0073] Preferably, the speed of the melt extrusion is 3-5 m / min, for example, it can be 3.2 m / min, 3.4 m / min, 3.6 m / min, 3.8 m / min, 4 m / min, 4.2 m / min, 4.4 m / min, 4.6 m / min, 4.8 m / min, etc.

[0074] The first and second cutoff adhesive films are prepared by using the double-screw extrusion technology, which not only improves the production efficiency, reduces the production time and cost, but also optimizes the production process. The extrusion temperature and speed of the first and second cutoff adhesive films are controlled within a suitable range to ensure that the cutoff adhesive film can be uniformly and continuously extruded and form a dense melt, avoiding problems such as material burning or uneven stretching caused by excessive temperature or speed. During the extrusion process, the special structure of the double-screw extruder allows the material to be fully mixed and plasticized in the barrel, thereby improving the uniformity and density of the cutoff adhesive film.

[0075] Preferably, the temperature of the first thermal compounding is 120-150℃, for example, it can be 122℃, 125℃, 128℃, 130℃, 132℃, 135℃, 138℃, 140℃, 142℃, 145℃, 148℃, etc.

[0076] Preferably, the pressure of the first thermal compounding is 0.2-0.5 MPa, for example, it can be 0.22 MPa, 0.25 MPa, 0.28 MPa, 0.3 MPa, 0.35 MPa, 0.38 MPa, 0.4 MPa, 0.42 MPa, 0.45 MPa, 0.48 MPa, etc. By controlling the pressure of the first thermal compounding within a suitable range, it is ensured that the cutoff adhesive film and the glass fiber layer can be fully bonded to form a tight composite structure.

[0077] Preferably, the time of the first thermal compounding is 5-20 s, for example, it can be 6 s, 7 s, 8 s, 9 s, 10 s, 11 s, 12 s, 13 s, 14 s, 15 s, 16 s, 17 s, 18 s, 19 s, etc.

[0078] Preferably, the temperature of the second and third thermal compounding is independently 80-120℃, for example, it can be 82℃, 85℃, 88℃, 90℃, 92℃, 95℃, 98℃, 100℃, 102℃, 105℃, 108℃, 110℃, 112℃, 115℃, 118℃, etc.

[0079] Preferably, the pressure of the second and third thermal compounding is independently 0.1-1 MPa, for example, can be 0.2 MPa, 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, etc.

[0080] Preferably, the time of the second and third thermal compounding is independently 5-20 s, for example, can be 6 s, 7 s, 8 s, 9 s, 10 s, 11 s, 12 s, 13 s, 14 s, 15 s, 16 s, 17 s, 18 s, 19 s, etc.

[0081] The present application ensures that the fluoroplastic film can be uniformly and firmly pasted on the first stop film. In the process of thermal compounding, the heating element of the thermal compounding machine rapidly heats the fluoroplastic film to a predetermined temperature, and makes it in close contact with the first stop film through appropriate pressure. With the passage of time, the intermolecular force between the fluoroplastic film and the first stop film gradually increases, forming a firm bonding interface, ensuring the transparency and aesthetics of the fluoroplastic film, and improving the overall performance and durability of the front plate of the photovoltaic module.

[0082] In the process of the third thermal compounding, special attention should be paid to the positioning and spreading of the barrier layer to ensure that it can completely cover the bottom of the second stop film and effectively prevent the intrusion of external water vapor. At the same time, the pressure and temperature of the third thermal compounding should be controlled to avoid damaging the water barrier layer and ion migration prevention layer or affecting their barrier properties.

[0083] Preferably, after the completion of the second and third thermal compounding, the process further includes the steps of geothermal treatment, cooling and winding in sequence.

[0084] The thermal treatment can ensure that the layers of the front plate of the photovoltaic module can be fully fused and form a good bonding interface, improving the overall strength and stiffness of the front plate of the photovoltaic module, and improving its comprehensive performance such as heat resistance, weather resistance and chemical resistance, and having excellent appearance and outstanding performance.

[0085] Preferably, the temperature of the thermal treatment is 100-200℃, for example, can be 110℃, 120℃, 130℃, 140℃, 150℃, 160℃, 170℃, 180℃, 190℃, etc.

[0086] Preferably, the time of the thermal treatment is 10-30 s, for example, can be 12 s, 14 s, 16 s, 18 s, 20 s, 22 s, 24 s, 26 s, 28 s, etc.

[0087] Preferably, the pressure of the heat treatment is 0.05-0.5 MPa, for example, it can be 0.1 MPa, 0.15 MPa, 0.2 MPa, 0.25 MPa, 0.3 MPa, 0.35 MPa, 0.4 MPa, 0.45 MPa, etc.

[0088] Preferably, the heat treatment is performed by a heat treatment roller technology.

[0089] Preferably, the rolling speed of the roller in the heat treatment roller technology is 1-10 m / min, for example, it can be 1.5 m / min, 2 m / min, 2.5 m / min, 3 m / min, 3.5 m / min, 4 m / min, 4.5 m / min, 5 m / min, 5.5 m / min, 6 m / min, 6.5 m / min, 7 m / min, 7.5 m / min, 8 m / min, 8.5 m / min, 9 m / min, 9.5 m / min, etc.

[0090] During the heat treatment, the roller heats and rolls the front plate of the photovoltaic module at a constant speed and temperature, and with the passage of time, the intermolecular forces inside the front plate of the photovoltaic module gradually increase and crosslinking reaction occurs to form a stable network structure.

[0091] Preferably, the temperature of the cooling is 18-24℃, for example, it can be 18.5℃, 19℃, 19.5℃, 20℃, 20.5℃, 21℃, 21.5℃, 22℃, 22.5℃, 23℃, 23.5℃, etc.

[0092] In a third aspect, the present application provides a photovoltaic module, which comprises the front plate of the photovoltaic module as described in the first aspect.

[0093] Compared with the prior art, the present application has the following beneficial effects:

[0094] The present application improves the hardness of the front plate of the photovoltaic module, effectively reduces the water vapor transmission rate and the potential induced degradation inside the photovoltaic module, thereby protecting the internal structure of the photovoltaic module and prolonging its service life. In addition, the front plate of the photovoltaic module provided by the present application is light in weight, which can reduce the weight of the photovoltaic module and make it easy to install and transport.

[0095] The front plate of the photovoltaic module provided by the present application has a blocking rate of 95.44-97.23% for ultraviolet light with a wavelength of 280-400 nm, and a Δb of 0.72-1.35 after 75 days of ultraviolet light irradiation, an initial water vapor transmission rate of 0.003-1.32 g / m 2 ·day, and a water vapor transmission rate of 0.01-1.78 g / m 2·day.

[0096] The photovoltaic module provided by the front plate of the photovoltaic module has a DH1000 back power of 313-367W and a hail impact back power of 327-365W, and the power attenuation is small. BRIEF DESCRIPTION OF DRAWINGS

[0097] Figure 1 is a cross-sectional structure schematic diagram of the front plate of the photovoltaic module provided in Embodiment 1;

[0098] wherein 1 is a fluorine plastic film, 2 is a glass fiber adhesive film composite layer, and 3 is a barrier layer; 101 is a first stop adhesive film, 102 is a glass fiber layer, 103 is a second stop adhesive film, 201 is an ion migration prevention layer, 202 is a substrate layer, and 203 is a water blocking layer. DETAILED DESCRIPTION

[0099] The technical solutions of the present application will be further described below in combination with the drawings and through specific embodiments. Those skilled in the art should understand that the embodiments are only to help understand the present application and should not be regarded as specific limitations on the present application.

[0100] Some components in the following examples and comparative examples are from the following sources:

[0101] (1) ETFE film: purchased from Jiaxing Gaozheng, thickness of 25 μm, light transmittance of 94%, and ultraviolet blocking rate of 98%;

[0102] (2) PVDF film: purchased from Jiaxing Gaozheng, thickness of 22 μm, light transmittance of 93%, and ultraviolet blocking rate of 97%;

[0103] (3) PVF film: purchased from DuPont, thickness of 20 μm, light transmittance of 94%, and ultraviolet blocking rate of 95%;

[0104] (4) PCTFE film: purchased from Honeywell International Corporation, thickness of 25 μm, light transmittance of 93.5%, and ultraviolet blocking rate of 97.8%;

[0105] (5) FEP film: purchased from Daikin Industry, thickness of 27 μm, light transmittance of 93%, and ultraviolet blocking rate of 96.6%;

[0106] (6) Glass fiber layer: purchased from Shandong Glass Fiber, thickness of 0.2 mm, and grammage of 80 g / m 2 ;

[0107] (7) PDMS-SiO2 hybrid material: purchased from Dow Corning Corporation;

[0108] (8) Antioxidant 168: purchased from BASF;

[0109] (9) EVA resin: purchased from Hanwha EVA1828 in Korea;

[0110] (10) POE resin: purchased from LG Chemical LC168;

[0111] (11) UV blocking agent UV-531: purchased from BASF;

[0112] (12) Terpene resin: purchased from Guangdong Nuochixin Material TF-DGB;

[0113] (13) Bisphenol A type epoxy resin: purchased from Dow Chemical DER669-20;

[0114] (14) Nitrile rubber: purchased from China Petroleum NBR1906.

[0115] Example 1

[0116] A photovoltaic module front plate, comprising a fluoroplastic film 1, a glass fiber adhesive film composite layer 2, and a barrier layer 3 which are sequentially stacked; the glass fiber adhesive film composite layer 2 comprises a first cutoff adhesive film 101, a glass fiber layer 102, and a second cutoff adhesive film 103 which are sequentially stacked; the barrier layer 3 comprises an ion migration prevention layer 201, a substrate layer 202, and a water blocking layer 203 which are sequentially stacked; the fluoroplastic film is an ETFE film; the first and second cutoff adhesive films are both POE adhesive films, and the thickness of each is 0.6 mm, and the grammage of each is 420 g / m 2 ; the material of the ion migration prevention layer is PDMS-SiO2 hybrid material, and the thickness is 30 nm; the material of the substrate layer is PET, and the thickness is 0.3 mm; the material of the water blocking layer is aluminum oxide, and the thickness is 50 nm;

[0117] The preparation method of the photovoltaic module front plate comprises the following steps:

[0118] (1) Preparation of barrier layer: sputter deposit a water blocking layer on one side of the substrate layer by magnetron sputtering technology, and in the process of magnetron sputtering, select a high-purity aluminum target, the sputtering power is 300 W, the argon flow rate is 50 sccm, and the sputtering time is 5 min;

[0119] On the other side of the substrate layer, deposit PDMS-SiO2 hybrid material by vacuum evaporation technology, the temperature of the evaporation source is 230°C, the vacuum degree is 10 -5 Torr, and the deposition rate is 50 nm / min;

[0120] Preparation of glass fiber adhesive film composite layer: 100 g POE resin particles, 2 g dicumyl peroxide, 0.5 g 2-(2'-hydroxy-5'-tert-octylphenyl) benzotriazole, 0.3 g antioxidant 168, 3 g terpene resin are melt-extruded through a double screw extruder to obtain a first cut-off adhesive film in a molten state;

[0121] 100 g POE resin particles, 1.5 g dicumyl peroxide, 0.3 g (2'-hydroxy-5'-methylphenyl)-benzotriazole, 0.2 g antioxidant 168, 5 g terpene resin are melt-extruded through the double screw extruder to obtain a second cut-off adhesive film in a molten state;

[0122] The screw diameter of the double screw extruder is 50 mm, and the length-diameter ratio is 20:1; the extrusion temperature of the first cut-off adhesive film and the second cut-off adhesive film is 100℃, and the extrusion speed is 5 m / min;

[0123] The first cut-off adhesive film in a molten state and the second cut-off adhesive film in a molten state are hot-combined on both surfaces of the glass fiber layer by a heating roller, wherein the hot-combining temperature is 140℃, the time is 20 s, and the pressure of the heating roller is 0.3 MPa;

[0124] (2) The fluoroplastic film is hot-combined on the surface of the first cut-off adhesive film away from the glass fiber layer by a hot-combining machine, wherein the hot-combining temperature is 120℃, the time is 10 s, and the pressure is 0.5 MPa;

[0125] The barrier layer is hot-combined on the surface of the second cut-off adhesive film away from the glass fiber layer by a hot-combining machine, wherein the hot-combining temperature is 120℃, the time is 15 s, and the pressure is 0.3 MPa;

[0126] The obtained material is subjected to heat treatment by a hot treatment roller technology, the heat treatment temperature is 150℃, the time is 20 s, the roller pressure is 0.1 MPa, the roller rolling speed is 5 m / min, and after the heat treatment is completed, cooling is carried out at 20℃ and then winding is carried out, to obtain the photovoltaic module front plate.

[0127] Example 2

[0128] A photovoltaic module front plate, which is different from example 1 in that PVDF film is used to replace ETFE film as fluoroplastic film, and other structures, substances and preparation methods are the same as those of example 1.

[0129] Example 3

[0130] A photovoltaic module front plate, which is different from example 1 in that PVF film is used to replace ETFE film as fluoroplastic film, and other structures, substances and preparation methods are the same as those of example 1.

[0131] Example 4

[0132] A front plate of a photovoltaic module, which differs from Example 1 in that a PCTFE film is used to replace the ETFE film as the fluoroplastic film, and other structures, materials and preparation methods are the same as those of Example 1.

[0133] Example 5

[0134] A front plate of a photovoltaic module, which differs from Example 1 in that a FEP film is used to replace the ETFE film as the fluoroplastic film, and other structures, materials and preparation methods are the same as those of Example 1.

[0135] Example 6

[0136] A front plate of a photovoltaic module, which differs from Example 1 in that an EVA adhesive film is used to replace the POE adhesive film as the first and second stopper adhesive films, the raw materials for preparing the EVA adhesive film include EVA resin 100 g, dicumyl peroxide 1 g, triallyl isocyanurate 2 g, antioxidant 168 0.5 g, UV-531 0.3 g, terpene resin 5 g, the preparation method of the EVA adhesive film is the same as that of Example 1, and other structures, materials and preparation methods are the same as those of Example 1.

[0137] Example 7

[0138] A front plate of a photovoltaic module, which differs from Example 1 in that an EPE adhesive film is used to replace the POE adhesive film as the first and second stopper adhesive films, the raw materials for preparing the EPE adhesive film include EVA resin 60 g, POE resin 40 g, dicumyl peroxide 1 g, triallyl isocyanurate 2 g, antioxidant 168 0.5 g, UV-531 0.3 g, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate 0.5 g, terpene resin 5 g, the preparation method of the EPE adhesive film is the same as that of Example 1, and other structures, materials and preparation methods are the same as those of Example 1.

[0139] Example 8

[0140] A front plate of a photovoltaic module, which differs from Example 1 only in that the material of the water-blocking layer is silicon dioxide, and other structures, materials and preparation methods are the same as those of Example 1.

[0141] Example 9

[0142] A front plate of a photovoltaic module, which differs from Example 1 only in that no ion migration prevention layer is provided, and other structures, materials and preparation methods are the same as those of Example 1.

[0143] Example 10

[0144] A front plate of a photovoltaic module, which is different from Example 1 only in that no water-blocking layer is provided, and other structures, materials and preparation methods are the same as those of Example 1.

[0145] Comparative Example 1

[0146] A front plate of a photovoltaic module, which is prepared according to CN219789512U, and the preparation method is as follows:

[0147] (1) 80 g of bisphenol A type epoxy resin, 20 g of ethylenediamine, 90 g of dimethylbenzene, 0.5 g of silane coupling agent KH-570, 0.5 g of antioxidant 1010 and 10 g of butyl nitrile rubber are mixed to obtain a resin pre-impregnation solution;

[0148] (2) The glass fiber cloth (purchased from Taishan Glass Fiber, thickness of 0.3 mm) is bonded with the resin pre-impregnation solution by infiltration to obtain a glass fiber resin infiltration layer, and the thickness is 0.5 mm;

[0149] (3) The glass fiber resin infiltration layer is hot-pressed with the ETFE film at 150°C and a pressure of 0.5 MPa for 480 s to obtain the front plate of the photovoltaic module.

[0150] Comparative Example 2

[0151] A front plate of a photovoltaic module, which is a KPC back plate (purchased from Suzhou Saiwo).

[0152] Application Example 1

[0153] A photovoltaic module, and the preparation method of the photovoltaic module comprises the following steps:

[0154] (1) A layer of POE adhesive film (thickness of 0.6 mm) special for N-TopCon cells is laid on an aluminum-containing back plate (1750×1033×0.3 mm), followed by laying a matrix of N-TopCon cell strings connected in series and parallel, then laying another layer of POE adhesive film (thickness of 0.6 mm) special for N-TopCon cells, and finally laying a layer of the front plate of the photovoltaic module provided in Example 1 to prepare a laminated assembly;

[0155] (2) The laminated assembly is placed in a laminator, and the laminating temperature is 145°C; vacuumizing for 300 s; segmental laminating at a pressure of -70 kPa, -50 kPa and -30 kPa; and the total laminating time is 600 s. After the laminating is completed, a laminated assembly is prepared;

[0156] (3) The laminated assembly is fixed by using a photovoltaic aluminum frame (1756×1039×30 mm) to obtain the photovoltaic module.

[0157] Application Example 2

[0158] A photovoltaic module, a preparation method of the photovoltaic module comprises the following steps:

[0159] (1) A layer of POE adhesive film (0.6 mm in thickness) is laid on an aluminum-containing back plate (1750*1033*0.3 mm), then a matrix of heterojunction cell strings connected in series and parallel is laid, and then a layer of POE adhesive film (0.6 mm in thickness) is laid, and finally a photovoltaic module front plate provided in Example 2 is laid to prepare a laminated assembly;

[0160] (2) The laminated assembly is placed in a laminating machine for lamination, the lamination temperature is 145 DEG C, vacuum pumping is performed for 300 s, and the lamination is performed in stages, the pressure is-70 kPa, -50 kPa and -30 kPa, the total lamination time is 600 s, and after the lamination is completed, a laminated assembly is prepared;

[0161] (3) The laminated assembly is fixed by using a photovoltaic aluminum frame (1756*1039*30 mm) to obtain the photovoltaic module.

[0162] Application Example 3

[0163] A photovoltaic module, a preparation method of the photovoltaic module comprises the following steps:

[0164] (1) A layer of POE adhesive film (0.6 mm in thickness) is laid on an aluminum-containing back plate (1750*1033*0.3 mm), then a matrix of perovskite laminated cell strings connected in series and parallel is laid, and then a layer of POE adhesive film (0.6 mm in thickness) is laid, and finally a photovoltaic module front plate provided in Example 6 is laid to prepare a laminated assembly;

[0165] (2) The laminated assembly is placed in a laminating machine for lamination, the lamination temperature is 145 DEG C, vacuum pumping is performed for 300 s, and the lamination is performed in stages, the pressure is-70 kPa, -50 kPa and -30 kPa, the total lamination time is 600 s, and after the lamination is completed, a laminated assembly is prepared;

[0166] (3) The laminated assembly is fixed by using a photovoltaic aluminum frame (1756*1039*30 mm) to obtain the photovoltaic module.

[0167] Application Examples 4-10 and Comparative Application Examples 1-2

[0168] A photovoltaic module and a preparation method thereof, which are different from those of Application Example 1 only in that the photovoltaic module front plate provided in Example 1 in step (1) is replaced by the photovoltaic module front plate provided in Examples 3-5, Examples 7-10 and Comparative Examples 1-2, and the remaining structures and materials are the same as those of Application Example 1.

[0169] Performance test

[0170] (1) UV blocking rate: using a spectrophotometer (Japan Shimadzu, UV-2600) to test the blocking rate of the front plate of the photovoltaic module to ultraviolet light with a wavelength of 280-400 nm;

[0171] (2) UV yellowing: tested according to ASTM D1925 using an accelerated UV aging box, the test conditions are UV 300 kWh, and the irradiation time is 75 days;

[0172] (3) Water vapor transmission rate: the front plate of the photovoltaic module is placed at 85°C, 85% RH for 1000h, and the water vapor transmission rate tester (Morgan, USA) is used to test the water vapor transmission rate before and after DH1000 of the front plate of the photovoltaic module. 3 / 40) test the water vapor transmission rate before and after DH1000 of the front plate of the photovoltaic module.

[0173] The front plate of the photovoltaic module provided by Examples 1-10, Comparative Examples 1-2 is tested according to the above method, and the test results are shown in Table 1 below:

[0174] Table 1

[0175]

[0176]

[0177] From the comparison of Examples 1-10 and Comparative Examples 1-2, it can be seen that the UV blocking rate and the UV yellowing resistance of the front plate of the photovoltaic module provided by the present application are better than the lightweight photovoltaic module front plate currently used in the market; and the initial water vapor transmission rate and the water vapor transmission rate of the photovoltaic module front plate after high temperature and high humidity aging are both significantly ahead of the existing lightweight photovoltaic module front plate on the market.

[0178] (4) Module power: using an IV power tester (manufacturer: Deqi Technology, model: UT673PV) to test the power of the photovoltaic module before and after DH1000;

[0179] (5) Ice hail impact resistance: tested according to IEC 61215.

[0180] The photovoltaic module provided by Application Examples 1-10, Comparative Application Examples 1-2 is tested according to the above method, and the test results are shown in Table 2 below:

[0181] Table 2

[0182]

[0183]

[0184] As can be known from the comparison of application examples 1-10 and comparative application examples 1-2, the lightweight photovoltaic module prepared using the front plate of the photovoltaic module provided by the application has a smaller attenuation compared to the initial power after DH1000 test, which indicates that the front plate of the photovoltaic module provided by the application can greatly improve the water resistance of the photovoltaic module. The photovoltaic module provided by application example 1-10 has a smaller attenuation compared to the initial power after the anti-hail test, which indicates that the use of the front plate of the photovoltaic module provided by the application greatly improves the anti-hail impact performance of the photovoltaic module.

[0185] The front plate of the photovoltaic module used in application example 9 does not have an ion migration prevention layer. Since the influence of the ion migration prevention layer on the performance of the cell is a cumulative process, in a humid and hot environment, ions continuously migrate and accumulate, which gradually deteriorates the performance of the cell, and eventually leads to a decrease in the overall power of the photovoltaic module after DH1000 test.

[0186] The applicant declares that the above-mentioned embodiments are used to illustrate the front plate of the photovoltaic module, the preparation method and application thereof of the application, but the application is not limited to the above-mentioned embodiments, i.e. it does not mean that the application must rely on the above-mentioned embodiments to be implemented. It should be understood by those skilled in the art that any improvement of the application, equivalent replacement of each raw material of the product of the application, addition of auxiliary ingredients, selection of specific modes, etc. fall within the protection scope and disclosure scope of the application.

Claims

1. A photovoltaic module front sheet, characterized by, The front plate of the photovoltaic module comprises a fluoroplastic film, a glass fiber adhesive film composite layer and a barrier layer which are sequentially stacked. The glass fiber adhesive film composite layer comprises a first cutting adhesive film, a glass fiber layer and a second cutting adhesive film which are sequentially stacked. The fluoroplastic film is attached to the surface of the first cutting adhesive film away from the glass fiber layer. The barrier layer comprises an ion migration prevention layer, a substrate layer and a water barrier layer which are sequentially stacked; the ion migration prevention layer is attached to the surface of the second cutting adhesive film away from the glass fiber layer. The thickness of the barrier layer is 0.05-0.5mm. The material of the ion migration prevention layer comprises any one or a combination of at least two of PDMS-SiO2 hybrid material, silicon nitride, zirconium oxide, polyethylene oxide-based composite material or metal organic framework material. The thickness of the ion migration prevention layer is 10-200nm. The material of the substrate layer comprises any one or a combination of at least two of polyethylene terephthalate, polycarbonate or polyamide. The material of the water barrier layer comprises any one or a combination of at least two of aluminum oxide, silicon dioxide, silicon nitride, titanium dioxide, zinc oxide, silicon carbide or magnesium oxide. The thickness of the water barrier layer is 10-200nm.

2. The photovoltaic module frontsheet of claim 1, wherein, The fluoroplastic film comprises any one of polyvinylidene fluoride film, polyfluoroethylene film, fluorinated ethylene-propylene copolymer film, ethylene-tetrafluoroethylene copolymer film, THV film or polytrifluorochloroethylene film.

3. The photovoltaic module frontsheet of claim 1, wherein, The thickness of the fluoroplastic film is 20-200μm.

4. The photovoltaic module frontsheet of claim 1, wherein, The light transmittance of the fluoroplastic film is ≥93%.

5. The photovoltaic module frontsheet of claim 1, wherein, The ultraviolet barrier rate of the fluoroplastic film is ≥95%.

6. The photovoltaic module frontsheet of claim 1, wherein, The thickness of the first cutting adhesive film and the second cutting adhesive film is independently 0.4-0.8mm.

7. The photovoltaic module frontsheet of claim 1, wherein, The first and second cutoff adhesive films each independently have a grammage of 100-1000 g / m 2 .

8. The photovoltaic module frontsheet of claim 1, wherein, The raw material for preparing the first cutting adhesive film and the second cutting adhesive film independently comprises a combination of resin, curing agent and ultraviolet barrier agent.

9. The photovoltaic module frontsheet of claim 8, wherein, The resin comprises any one or a combination of at least two of polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer or polyvinyl butyral.

10. The photovoltaic module frontplane of claim 8, wherein, The curing agent comprises any one or a combination of at least two of dicumyl peroxide, di-tert-butyl peroxide or triallyl isocyanurate.

11. The photovoltaic module frontsheet of claim 8, wherein, The ultraviolet barrier agent comprises any one or a combination of at least two of 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chloro-benzotriazole, (2'-hydroxy-5'-methylphenyl)-benzotriazole, 2-cyano-3,3-diphenyl acrylate ethyl, ethylhexyl p-methoxycinnamate, 2-(4,6-diphenyl-1,3,5-triazine-2)-5-n-hexyloxyphenol, polysiloxane or 2-hydroxy-4-n-octyloxybenzophenone.

12. The photovoltaic module frontsheet of claim 8, wherein, The mass ratio of the resin to the curing agent is 100:(0.5-5).

13. The photovoltaic module frontsheet of claim 8, wherein, The mass ratio of the resin to the ultraviolet barrier agent is 100:(0.1-2).

14. The photovoltaic module frontplane of claim 8, wherein, The raw material for preparing the first cutting adhesive film and the second cutting adhesive film further independently comprises an auxiliary agent.

15. The photovoltaic module frontplane of claim 14, wherein, The auxiliary agent comprises any one or a combination of at least two of light stabilizer, antioxidant, tackifying resin or lubricant.

16. The photovoltaic module frontplane of claim 14, wherein, The mass ratio of the resin to the auxiliary agent is 100: (0.5-15).

17. The photovoltaic module frontplane of claim 1, wherein, The glass fiber layer has a grammage of 50-500 g / m 2 .

18. The photovoltaic module frontplane of claim 1, wherein, The thickness of the glass fiber layer is 0.2-1 mm.

19. The photovoltaic module frontplane of claim 1, wherein, The preparation method of the barrier layer comprises: The ion migration prevention layer is compounded on one side of the substrate layer by a first method, and the water barrier layer is compounded on the other side of the substrate layer by a second method to obtain the barrier layer; The first method and the second method each independently comprises any one of magnetron sputtering, vacuum evaporation, atomic layer deposition or plasma enhanced chemical vapor deposition.

20. The photovoltaic module frontplane of claim 19, wherein, The first method is vacuum evaporation.

21. The photovoltaic module frontplane of claim 19, wherein, The second method is magnetron sputtering.

22. A method of manufacturing a front sheet for a photovoltaic module according to any one of claims 1-21, characterized in that, The preparation method comprises the following steps: (1) laminating a first cutoff adhesive film, a glass fiber layer and a second cutoff adhesive film, and then performing first thermal compounding to obtain a glass fiber adhesive film composite layer; (2) performing second thermal compounding between the surface of the first cutoff adhesive film away from the glass fiber layer and a fluoroplastic film, and performing third thermal compounding between the surface of the second cutoff adhesive film away from the glass fiber layer and a barrier layer to obtain the front plate of the photovoltaic module.

23. The preparation method according to claim 22, characterized in that, The preparation method of the first cutoff adhesive film comprises: Melting and extruding the preparation raw material of the first cutoff adhesive film to obtain the first cutoff adhesive film; The preparation method of the second cutoff adhesive film comprises: Melting and extruding the preparation raw material of the second cutoff adhesive film to obtain the second cutoff adhesive film.

24. The method of claim 23, wherein, The first thermal compounding is performed when the first cutoff adhesive film and the second cutoff adhesive film are in a molten state after extrusion.

25. The preparation method according to claim 23, characterized in that, The melting and extrusion is performed by a double screw extruder.

26. The method of claim 25, wherein, The screw diameter of the double screw extruder is 20-150 mm.

27. The preparation method according to claim 25, characterized in that, The screw length-diameter ratio of the double screw extruder is (10-50):

1.

28. The preparation method according to claim 23, characterized in that, The temperature of the melting and extrusion is 80-120℃.

29. The preparation method according to claim 23, characterized in that, The speed of the melting and extrusion is 3-5 m / min.

30. The method of claim 22, wherein, The temperature of the first thermal compounding is 120-150℃.

31. The method of claim 22, wherein the method is carried out at a temperature of about 20°C to about 30°C. The pressure of the first thermal compounding is 0.2-0.5 MPa.

32. The method of claim 22, wherein the method is carried out at a temperature of about 20°C to about 30°C. The time of the first thermal compounding is 5-20 s.

33. The method of claim 22, wherein the method is carried out at a temperature of about 20°C to about 30°C. The temperature of the second thermal compounding and the third thermal compounding each independently is 80-120℃.

34. The method of claim 22, wherein, The pressure of the second thermal compounding and the third thermal compounding each independently is 0.1-1 MPa.

35. The method of claim 22, wherein the method is carried out at a temperature of about 20 °C to about 30 °C. The time of the second thermal compounding and the third thermal compounding each independently is 5-20 s.

36. The method of claim 22, wherein, After the second thermal compounding and the third thermal compounding are completed, the steps of sequentially performing heat treatment, cooling and winding are further included.

37. The method of claim 36, wherein the method is performed in a single step. The temperature of the heat treatment is 100-200℃.

38. The preparation method according to claim 36, characterized in that, The time of the heat treatment is 10-30 s.

39. The method of claim 36, wherein the method further comprises, The pressure of the heat treatment is 0.05-0.5 MPa.

40. The method of claim 36, wherein, The temperature of the cooling is 18-24℃.

41. A photovoltaic module, characterized by, The photovoltaic module comprises the front plate of the photovoltaic module as claimed in any one of claims 1-21.

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