Photovoltaic synergistic film with double-sided matte coatings

Abstract

The utility model relates to the technical field of H01L31 / 00, in particular to a photovoltaic synergistic film with a double-sided matte coating. The matte adhesive tape sequentially comprises an adhesive layer, a second matte coating, a base material layer and a first matte coating from bottom to top. The utility model provides the photovoltaic synergistic film with the double-sided matte coatings, by optimizing the structural design of the film layer, the problems that the conventional photovoltaic synergistic film is poor in weather resistance and easy to yellow are effectively solved, and the photovoltaic synergistic film can be applied to a double-glass assembly, so that the output power is improved again, and the photovoltaic synergistic film has very high popularization and application values.

Description

Technical Field

[0001] The utility model relates to the H01L31 / 00 technical field, in particular to a photovoltaic efficiency enhancement film with a double-sided matte coating. Background Art

[0002] As technology advances and the global population grows, the demand for renewable energy has increased dramatically around the world. The growing demand for electricity generated by solar energy has been accompanied by a growing demand for devices and materials that can meet the requirements of these applications. In photovoltaic module design, the tab strips represent inactive shadow areas (areas where incident light is not absorbed for photovoltaic or photoelectric conversion). Due to the presence of these inactive shadow areas, the total active surface area (the total area where incident light is used for photovoltaic or photoelectric conversion) in the photovoltaic module is less than 100% of the original photovoltaic cell area. Therefore, the amount of current that can be generated by the photovoltaic module is reduced due to the presence of inactive shadow areas, resulting in reduced output power.

[0003] At present, there are some photovoltaic efficiency-enhancing films pasted in the gaps between solar cells on the market. The Chinese patent with patent application number CN201822244771.1 discloses photovoltaic modules. Specifically, during the assembly process of the photovoltaic modules, a light-reflecting film is set on the side of the second packaging film to improve the light utilization rate. However, these photovoltaic efficiency-enhancing films have poor weather resistance and are prone to yellowing in a short period of time, resulting in a decrease in the efficiency of the photovoltaic efficiency-enhancing films or even structural damage, making them unable to play an efficiency-enhancing role. In addition, traditional photovoltaic efficiency-enhancing films are not suitable for double-glass modules.

[0004] Therefore, the main technical problem that needs to be solved at present is to provide a matte-coated photovoltaic efficiency-enhancing film that is suitable for double-glass modules and has high reflectivity and good weather resistance. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a photovoltaic efficiency-enhancing film with a double-sided matte coating, which comprises, from bottom to top, an adhesive layer, a second matte coating, a substrate layer, and a first matte coating.

[0006] In one embodiment, the thickness of the adhesive layer is 30-80 μm.

[0007] In one embodiment, the thickness of the adhesive layer is 40-60 μm.

[0008] In one embodiment, the adhesive layer is composed of a hot melt adhesive or a pressure sensitive adhesive.

[0009] In a preferred embodiment, the adhesive layer is made of hot melt adhesive, the hot melt adhesive is EVA, and the EVA can be purchased from DuPont EVA265 in the United States.

[0010] In one embodiment, the first matte coating layer and the second matte coating layer are respectively coated and connected with the substrate layer by a micro-dimpled coating method, and dried at 120° C. for 1-3 minutes.

[0011] In one embodiment, the adhesive layer is coated on the second matte coating layer by lamination.

[0012] In a preferred embodiment, EVA is heated at 100° C. to melt into a gel, and is evenly coated on the second matte coating. It is then quickly passed through the gap between two cooling rollers to obtain a photovoltaic efficiency-enhancing film with a double-sided matte coating.

[0013] In one embodiment, the second matte coating has a thickness of 5-30 μm.

[0014] In one embodiment, the second matte coating has a thickness of 6-20 μm.

[0015] In one embodiment, the substrate layer is a transparent PET film or a PET white film.

[0016] In one embodiment, the substrate layer is a PET white film, which can be purchased from sources including PET white film WF05C from Shanghai Hongyu Chemical Technology Co., Ltd.

[0017] In one embodiment, the substrate layer has a thickness of 10-80 μm.

[0018] In one embodiment, the substrate layer has a thickness of 30-55 μm.

[0019] In one embodiment, the thickness of the first matte coating is 5-30 μm.

[0020] In one embodiment, the thickness of the first matte coating is 6-20 μm.

[0021] In order to make the film reflectivity of the photovoltaic efficiency-enhancing film with a high-reflectivity matte coating ≥80% and the power generation gain ≥2.5%, the inventors found during the experiment that when the thickness of the first matte coating is preferably 6-20μm, the thickness of the substrate layer is 30-55μm, the thickness of the second matte coating is 6-20μm, and the thickness of the adhesive layer is 30-80μm, the film reflectivity of the photovoltaic efficiency-enhancing film with a double-sided matte coating can be ≥80%, and the power generation gain can be ≥2.5%.

[0022] In one embodiment, the first matte coating layer and the second matte coating layer are coated with ink to obtain a structural layer.

[0023] The ink can be purchased from manufacturers including the ECO STAR series inks of Jiangmen Toyo Ink Co., Ltd.

[0024] In order to apply double-glass modules and improve the total output power of photovoltaic modules, the inventors found in the experiment that by coating the first matte coating and the second matte coating on both sides of the substrate layer, when sunlight irradiates the coating surface for diffuse reflection, it is reflected twice to the surface of the battery cell, which improves the light utilization rate of the gap between the battery modules, thereby improving the total output power of the photovoltaic module. In addition, the structural design of the double-sided coating of the substrate layer enables the photovoltaic efficiency enhancement film to further improve the output power of the double-glass photovoltaic module when it is used in the field of double-glass photovoltaic module technology. At the same time, it solves the problem of poor weather resistance of existing photovoltaic efficiency enhancement films.

[0025] Beneficial Effects

[0026] 1. The utility model provides a photovoltaic efficiency-enhancing film with a double-sided matte coating. By optimizing the film structure design, it effectively solves the problem that the current photovoltaic efficiency-enhancing film has poor weather resistance and is prone to yellowing. It can also be applied to double-glass components to further increase the output power, and has a high value for promotion and application.

[0027] 2. The photovoltaic efficiency-enhancing film with double-sided matte coating provided by the utility model can make the sunlight irradiated on the gap between the battery cells and the surface of the welding strip be reflected to the surface of the photovoltaic cell for the second time, so as to improve the utilization rate of light energy and increase the total output power of the battery module.

[0028] 3. The utility model matches the thickness of the first matte coating and the second matte coating to 6-20 μm and further matches the substrate layer in a suitable thickness range, so that the reflectivity of the photovoltaic efficiency-enhancing film provided is ≥80% and the power generation gain is ≥2.5%.

[0029] 4. The photovoltaic efficiency-enhancing film with double-sided matte coating provided by the utility model has convenient installation and wide applicability by setting an adhesive layer, can meet the requirements of actual installation and use, and avoid falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the photovoltaic efficiency-enhancing film structure with a double-sided matte coating is provided.

[0031] Figure 1 Middle: 1 adhesive layer, 2 second matte coating, 3 substrate layer, 4 first matte coating. DETAILED DESCRIPTION

[0032] Figure 1 A schematic diagram of the structure of the photovoltaic efficiency-enhancing film with a double-sided matte coating provided in Examples 1-5 is provided.

[0033] In Examples 1-5, the first matte coating layer 4 and the second matte coating layer 2 are respectively connected to the substrate layer 3 by micro-concave coating method, and dried at 120° C. for 2 minutes.

[0034] The adhesive layer 1 is coated on the second matte coating layer 2 by lamination.

[0035] The adhesive layer 1 is made of EVA particles which are heated at 100° C. to melt into a gel state, and is evenly coated on the second matte coating 2 , and then quickly passed through the gap between two cooling rollers to form a photovoltaic efficiency-enhancing film with double-sided matte coatings.

[0036] Example 1

[0037] This embodiment provides a photovoltaic efficiency-enhancing film with a double-sided matte coating, which comprises, from bottom to top, an adhesive layer 1, a second matte coating 2, a substrate layer 3, and a first matte coating 4.

[0038] The thickness of the adhesive layer 1 is 50 μm.

[0039] The thickness of the second matte coating 2 is 7 μm.

[0040] The thickness of the substrate layer 3 is 50 μm.

[0041] The thickness of the first matte coating 4 is 7 μm.

[0042] The first matte coating layer 4 and the second matte coating layer 2 are coated with ink to obtain a structural layer.

[0043] The ink was purchased from the ECO STAR series ink of Jiangmen Toyo Ink Co., Ltd.

[0044] The substrate layer 3 is made of PET white film.

[0045] The PET white film was purchased from PET white film WF05C from Shanghai Hongyu Chemical Technology Co., Ltd.

[0046] The adhesive layer 1 is made of hot melt adhesive, and the hot melt adhesive is purchased from DuPont EVA265 in the United States.

[0047] Example 2

[0048] This embodiment provides a photovoltaic efficiency-enhancing film with a double-sided matte coating, which comprises, from bottom to top, an adhesive layer 1, a second matte coating 2, a substrate layer 3, and a first matte coating 4.

[0049] The thickness of the adhesive layer 1 is 50 μm.

[0050] The thickness of the second matte coating 2 is 7 μm.

[0051] The thickness of the substrate layer 3 is 25 μm.

[0052] The thickness of the first matte coating 4 is 7 μm.

[0053] The first matte coating layer 4 and the second matte coating layer 2 are coated with ink to obtain a structural layer.

[0054] The material types used for the first matte coating layer, the substrate layer, the second matte coating layer and the adhesive layer are the same as those in Example 1.

[0055] Example 3

[0056] This embodiment provides a photovoltaic efficiency-enhancing film with a double-sided matte coating, which comprises, from bottom to top, an adhesive layer 1, a second matte coating 2, a substrate layer 3, and a first matte coating 4.

[0057] The thickness of the adhesive layer 1 is 50 μm.

[0058] The thickness of the second matte coating 2 is 10 μm.

[0059] The thickness of the substrate layer 3 is 50 μm.

[0060] The thickness of the first matte coating 4 is 10 μm.

[0061] The first matte coating layer 4 and the second matte coating layer 2 are coated with ink to obtain a structural layer.

[0062] The material types used for the first matte coating layer, the substrate layer, the second matte coating layer and the adhesive layer are the same as those in Example 1.

[0063] Example 4

[0064] This embodiment provides a photovoltaic efficiency-enhancing film with a double-sided matte coating, which comprises, from bottom to top, an adhesive layer 1, a second matte coating 2, a substrate layer 3, and a first matte coating 4.

[0065] The thickness of the adhesive layer 1 is 50 μm.

[0066] The thickness of the second matte coating 2 is 10 μm.

[0067] The thickness of the substrate layer 3 is 12 μm.

[0068] The thickness of the first matte coating 4 is 10 μm.

[0069] The first matte coating layer 4 and the second matte coating layer 2 are coated with ink to obtain a structural layer.

[0070] The material types used for the first matte coating layer, the substrate layer, the second matte coating layer and the adhesive layer are the same as those in Example 1.

[0071] Example 5

[0072] This embodiment provides a photovoltaic efficiency-enhancing film with a double-sided matte coating, which comprises, from bottom to top, an adhesive layer 1, a second matte coating 2, a substrate layer 3, and a first matte coating 4.

[0073] The thickness of the adhesive layer 1 is 50 μm.

[0074] The thickness of the second matte coating 2 is 13 μm.

[0075] The thickness of the substrate layer 3 is 36 μm.

[0076] The thickness of the first matte coating 4 is 13 μm.

[0077] The first matte coating layer 4 and the second matte coating layer 2 are coated with ink to obtain a structural layer.

[0078] The material types used for the first matte coating layer, the substrate layer, the second matte coating layer and the adhesive layer are the same as those in Example 1.

[0079] Performance Testing

[0080] 1. Film reflectivity test

[0081] Photovoltaic efficiency-enhancing film is used for solar cell modules. The reflectivity test of the photovoltaic efficiency-enhancing film provided in the example was carried out according to GB / T 20503-2006. The results are shown in Table 1.

[0082] 2. Power generation gain test

[0083] The power generation gain rate refers to the rate of increase in the total output power of the photovoltaic module by the photovoltaic efficiency enhancement film. The photovoltaic efficiency enhancement film is used for solar cell modules. The efficiency of the photovoltaic module is measured according to the method provided in GB / T 39857-2021. The power generation gain rate is obtained by comparing the blank test data. The results are shown in Table 1.

[0084] Table 1

[0085] Test items Example 1 Example 2 Example 3 Example 4 Example 5 Film reflectivity (%) 81 78 82 80 83 Power generation gain (%) 2.2 1.8 2.6 2.0 2.6

Claims

1. A photovoltaic efficiency enhancement film with a double-sided matte coating, characterized in that: The invention comprises, from bottom to top, an adhesive layer (1), a second matte coating layer (2), a substrate layer (3), and a first matte coating layer (4); The thickness of the adhesive layer (1) is 30-80 μm; The thickness of the second matte coating (2) is 5-30 μm; The thickness of the substrate layer (3) is 30-55 μm; The thickness of the first matte coating (4) is 6-20 μm; The first matte coating layer and the second matte coating layer are coated with ink to obtain a structural layer.

2. The photovoltaic efficiency-enhancing film with double-sided matte coating according to claim 1, characterized in that: The thickness of the adhesive layer (1) is 40-60 μm.

3. The photovoltaic efficiency-enhancing film with double-sided matte coating according to claim 1, characterized in that: The thickness of the second matte coating (2) is 6-20 μm.

4. The photovoltaic efficiency-enhancing film with double-sided matte coating according to any one of claims 1 to 3, characterized in that: The substrate layer (3) is a transparent PET film or a white PET film.

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