High-reflection integrated film and photovoltaic module
By using a high-reflectivity integrated film in photovoltaic modules, the reflective coating reflects light to the light-receiving surface of the cell string, solving the problem of low reflectivity of the encapsulation film and improving the power and encapsulation efficiency of photovoltaic modules.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 通威太阳能(盐城)有限公司
- Filing Date
- 2025-02-10
- Publication Date
- 2026-04-14
AI Technical Summary
In existing photovoltaic modules, the low reflectivity of the encapsulating film leads to reduced power. Adding a high-reflectivity film to the back cover increases the encapsulation process and reduces encapsulation efficiency.
A high-reflectivity integrated film is used, including a substrate, a reflective coating, a first adhesive film, and a second adhesive film. It is connected to the battery string and the back cover plate through high-temperature lamination. The reflective coating reflects light to the light-receiving surface of the battery string, improving light utilization.
To increase the power of photovoltaic modules while avoiding additional packaging processes, ensuring packaging efficiency, and enhancing adhesion and yield.
Smart Images
Figure CN224124514U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photovoltaic module technology, and in particular to high-reflectivity integrated films and photovoltaic modules. Background Technology
[0002] A photovoltaic (PV) cascade structure comprises a front cover, a cell string, and a back cover stacked sequentially. Encapsulating films are provided between the front cover and the cell string, and between the back cover and the cell string. The PV cascade structure is encapsulated using a high-temperature lamination method to form a PV module.
[0003] Common encapsulation films are EVA (Ethylene Vinyl Acetate Copolymer) films or POE (Polyolefin Elastomer) films. Because EVA and POE films are semi-transparent and have low reflectivity, using either film between the back cover and the cell string will reduce the power output of the photovoltaic module. To improve the power output of the photovoltaic module, a high-reflectivity film is usually added to the back cover. However, this increases the encapsulation process and reduces encapsulation efficiency. Utility Model Content
[0004] Therefore, it is necessary to provide a high-reflectivity integrated film and photovoltaic module to avoid the increase of encapsulation process and ensure encapsulation efficiency.
[0005] In a first aspect, this application provides a high-reflectivity integrated film, comprising:
[0006] A substrate having opposing first and second surfaces, the first surface being provided with a reflective coating for reflecting light;
[0007] A first adhesive film, the first adhesive film being laminated to the first surface; and
[0008] The second adhesive film is laminated onto the second surface.
[0009] In one embodiment, the reflective coating is a white coating.
[0010] In one embodiment, multiple reflective coatings are provided, all of which are configured to correspond to the gap regions of the battery string.
[0011] In one embodiment, the side of the first adhesive film facing away from the substrate has a first rough surface.
[0012] In one embodiment, the first rough surface is provided with a first embossed pattern.
[0013] In one embodiment, the side of the second film facing away from the substrate has a second rough surface.
[0014] In one embodiment, the second rough surface is provided with a second embossed pattern.
[0015] In one embodiment, the first adhesive film is an EVA adhesive film or a POE adhesive film, and the second adhesive film is an EVA adhesive film or a POE adhesive film.
[0016] In one embodiment, the thickness of the substrate is 95 μm to 105 μm, and the thickness of the reflective coating is 15 μm to 25 μm.
[0017] Secondly, this application also provides a photovoltaic module, including a front cover plate, an encapsulating film, a battery string, a back cover plate, and a high-reflectivity integrated film of any one of the above. The front cover plate and the back cover plate are transparent. The front cover plate, the encapsulating film, the battery string, the high-reflectivity integrated film, and the back cover plate are stacked sequentially. The first encapsulating film is connected to the battery string, the second encapsulating film is connected to the back cover plate, and the reflective coating is correspondingly disposed in the gap area between the battery string and the battery string.
[0018] The aforementioned high-reflectivity integrated film and photovoltaic module have a reflective coating on the first surface of the substrate, a first adhesive film laminated to the first surface, and a second adhesive film laminated to the second surface, thus forming a high-reflectivity integrated film. After the battery strings are arranged, the high-reflectivity integrated film is laid on the back surface of the battery strings, and a back cover plate is laid on the high-reflectivity integrated film. Then, the laminated structure is subjected to high-temperature lamination. In this way, the reflective coating can reflect light to the light-receiving surface of the battery strings, improving light utilization and thus increasing the power of the photovoltaic module. At the same time, there is no need to attach a high-reflectivity film to the back cover plate, avoiding the increase of the encapsulation process and ensuring encapsulation efficiency. Attached Figure Description
[0019] Figure 1 This is a cross-sectional view of a high-reflectivity integrated film according to an embodiment of this application.
[0020] Figure 2 This is a cross-sectional view of a photovoltaic module according to an embodiment of this application.
[0021] Explanation of icon numbers:
[0022] 10. High-reflectivity integrated film; 11. Substrate; 111. First surface; 112. Second surface; 113. Reflective coating; 12. First adhesive film; 121. First roughened surface; 13. Second adhesive film; 131. Second roughened surface; 20. Front cover plate; 30. Encapsulation film; 40. Battery string; 41. Light-receiving surface; 42. Backlighting surface; 50. Back cover plate. Detailed Implementation
[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0024] See Figure 2 The photovoltaic module provided in one embodiment of this application includes a front cover plate 20, an encapsulating film 30, a battery string 40, a high-reflectivity integrated film 10, and a back cover plate 50, which are stacked in sequence.
[0025] Both the front cover 20 and the back cover 50 are transparent.
[0026] Optionally, the front cover 20 is a glass cover, and the back cover 50 is a glass cover or an organic polymer cover.
[0027] By setting a high-reflectivity integrated film 10 between the battery string 40 and the back cover plate 50, light can reach the high-reflectivity integrated film 10 through the front cover plate 20. The high-reflectivity integrated film 10 reflects the light back to the front cover plate 20, and the front cover plate 20 then reflects the light back to the light-receiving surface 41 of the battery string 40, thereby improving the utilization rate of light and thus increasing the power of the photovoltaic module.
[0028] In one embodiment, see Figure 1 The high-reflectivity integrated film 10 includes a substrate 11, a first adhesive film 12, and a second adhesive film 13. The substrate 11 has opposing first surfaces 111 and second surfaces 112. The first surface 111 is coated with a reflective coating 113 for reflecting light. The first adhesive film 12 is laminated to the first surface 111 and is used to connect the backlight surface 42 of the battery string 40. The second adhesive film 13 is laminated to the second surface 112 and is used to connect the back cover plate 50.
[0029] During production, a reflective coating 113 is applied to the first surface 111 of the substrate 11, and a first adhesive film 12 is also laminated onto the first surface 111. A second adhesive film 13 is laminated onto the second surface 112 to form a high-reflectivity integrated film 10. After the battery strings 40 are arranged, the high-reflectivity integrated film 10 is laid on the backlight surface 42 of the battery strings 40, and the back cover plate 50 is laid on the high-reflectivity integrated film 10. Then, the laminated structure is subjected to high-temperature lamination. In this way, the reflective coating 113 can reflect light to the light-receiving surface 41 of the battery strings 40, improving the light utilization rate and thus increasing the power of the photovoltaic module. At the same time, there is no need to attach a high-reflectivity film to the back cover plate 50, avoiding the increase of the encapsulation process and ensuring encapsulation efficiency.
[0030] In addition, during high-temperature lamination, the second adhesive film 13 laminated to the substrate 11 melts, causing the substrate 11 with the reflective coating 113 to adhere to the back cover plate 50, ensuring the strong adhesion between the high-reflection integrated film 10 and the back cover plate 50, and improving the yield of photovoltaic modules.
[0031] In one embodiment, the reflective coating 113 is a white reflective layer. The white reflective layer can reflect all light, allowing more light to reach the cell string 40, improving light utilization and thus increasing the power of the photovoltaic module.
[0032] Specifically, the filler in the reflective coating is white. Optionally, the filler in the reflective coating 113 is TiO2, which has a high refractive index and high weather resistance. Of course, in other embodiments, other white fillers may be added to the reflective coating, and this is not a limitation.
[0033] In one embodiment, multiple reflective coatings 113 are provided, and all reflective coatings 113 are configured to correspond to the gap regions of the battery string 40.
[0034] It should be noted that the gap area of the battery string 40 refers to the gap between two adjacent battery cells. When there are at least two battery strings 40, the gap area of the battery string 40 also refers to the gap between two adjacent battery strings 40.
[0035] By positioning the reflective coating 113 in the gap area of the battery string 40, the reflective coating 113 does not block the battery string 40, ensuring that the battery string 40 itself absorbs light. At the same time, the reflective coating 113 can also reflect light to the light-receiving surface 41 of the battery string 40, allowing more light to reach the battery string 40, improving light utilization, and thus increasing the power of the photovoltaic module.
[0036] In one embodiment, the substrate 11 has a certain light transmittance. Specifically, the light transmittance of the substrate 11 is greater than 90%. When the photovoltaic module is installed in environments such as snow and sand, the light reflected by the snow and sand can reach the backlight surface 42 of the cell string 40 through the back cover plate 50 and the substrate 11. At the same time, the light can also reach the reflective coating 113, which can reflect the light back to the backlight surface 42 of the cell string 40, thereby improving the power of the photovoltaic module.
[0037] Optionally, the material of the matrix 11 is PET (Polyethylene terephthalate, thermoplastic polyester). PET matrix 11 has excellent electrical insulation, creep resistance, fatigue resistance and dimensional stability.
[0038] In one embodiment, reflective coating is applied to the first surface 111 of the battery string 40 by printing to form a reflective coating 113 on the first surface 111 of the battery string 40. Optionally, the printing method is screen printing. During printing, a printing screen is customized according to the layout of the battery string 40, such as the gap area between two adjacent battery strings 40 and the gap area between two adjacent battery cells. Then, the substrate 11 is placed under the screen, the reflective coating is placed on the screen, and a squeegee moves back and forth on the screen, so that the reflective coating is transferred to the substrate 11 through the mesh to form a mesh-like coating on the first surface 111 of the substrate 11.
[0039] Of course, in other embodiments, the reflective coating 113 can also be coated on the first surface 111 of the substrate 11 by means of inkjet printing or other methods.
[0040] In one embodiment, see Figure 1 The first adhesive film 12 has a first rough surface 121 on the side facing away from the substrate 11. This increases the surface roughness of the high-reflectivity integrated film 10. After the high-reflectivity integrated film 10 is laid on the back surface 42 of the battery string 40, the friction between the high-reflectivity integrated film 10 and the battery string 40 can be increased, preventing the high-reflectivity integrated film 10 from shifting position during high-temperature lamination, ensuring the lamination quality of the photovoltaic module, and improving the yield of the photovoltaic module.
[0041] Optionally, the first rough surface 121 is provided with a first embossed pattern. It should be noted that the first embossed pattern will melt after high-temperature lamination.
[0042] In one embodiment, see Figure 1 The second adhesive film 13 has a second rough surface 131 on the side facing away from the substrate 11. This increases the surface roughness of the high-reflectivity integrated film 10. After the back cover plate 50 is laid on the first rough surface 121, the friction between the back cover plate 50 and the high-reflectivity integrated film 10 is increased. This can prevent the high-reflectivity integrated film 10 from shifting position during high-temperature lamination, ensuring the lamination quality of the photovoltaic module and improving the yield of the photovoltaic module.
[0043] Optionally, the second rough surface 131 is provided with a second embossed pattern. It should be noted that the second embossed pattern will melt after high-temperature lamination.
[0044] In one embodiment, the first adhesive film 12 and the second adhesive film 13 are EVA (Ethylene Vinyl Acetate Copolymer) films. The EVA film has high transparency, preventing light obstruction. It also has high adhesion, ensuring a strong bond between the high-reflectivity integrated film 10 and the battery string 40 and the back cover plate 50. Furthermore, the EVA film has good durability, resisting high temperatures, moisture, and ultraviolet radiation, preventing the high-reflectivity integrated film 10 from separating from the battery string 40 after prolonged use of the photovoltaic module.
[0045] Of course, in other embodiments, the first film 12 and the second film 13 can also be POE (Polyolefin Elastomer) films. POE films have good resistance to ultraviolet aging, which can extend the service life of photovoltaic modules. POE films have good thermal stability; even at high temperatures, they can maintain stable performance, which is beneficial for the stable operation of photovoltaic modules in high-temperature environments. POE films also have good toughness and tear resistance, which can enhance the compressive strength of photovoltaic modules.
[0046] In one embodiment, the thickness of the substrate 11 is 95 μm to 105 μm, the thickness of the reflective coating 113 is 15 μm to 25 μm, and the basis weight of the first adhesive film 12 and the second adhesive film 13 is 380 g / m². 2 .
[0047] This application also provides a method for manufacturing the high-reflectivity integrated film 10, including the following steps:
[0048] S100, A reflective coating 113 is applied to the first surface 111 of the substrate 11.
[0049] In this embodiment, the reflective coating is printed onto the first surface 111 of the substrate 11 by screen printing. Then, the reflective coating is heated at a temperature of 140°C to 150°C for 15 minutes and finally cooled to room temperature.
[0050] S200. After the reflective coating 113 has cured, the first adhesive film 12 is laminated on the first surface 111 of the substrate 11, and the second adhesive film 13 is laminated on the second surface 112 of the substrate 11.
[0051] In this embodiment, a first adhesive film 12 is laminated on the first surface 111 of the substrate 11 by casting lamination, and a second adhesive film 13 is laminated on the second surface 112 of the substrate 11 by casting lamination.
[0052] S300, emboss the surface of the first adhesive film 12 and the second adhesive film 13.
[0053] S400, the first adhesive film 12 and the second adhesive film 13 are cooled and shaped.
[0054] In this embodiment, a circulating cooling water tank is used to cool and shape the first adhesive film 12 and the second adhesive film 13.
[0055] Thus, by using the above method to manufacture the high-reflectivity integrated film 10, the stability of the manufacturing process can be improved, the number of production steps can be reduced, and the complexity of the process can be decreased.
[0056] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0057] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0058] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0059] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0060] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.
[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A high-reflectance integrated film (10) characterized by, Comprising: a base body (11) having opposite first and second surfaces (111, 112), the first surface (111) being provided with a reflective coating (113) for reflecting light rays; a first adhesive film (12) being compounded to the first surface (111); and a second adhesive film (13) being compounded to the second surface (112); the first adhesive film (12) having a first rough surface (121) on a side facing away from the base body (11); and / or, the second adhesive film (13) having a second rough surface (131) on a side facing away from the base body (11).
2. The high-reflectivity integral film (10) according to claim 1, characterized in that, The reflective coating (113) is a white coating.
3. The high-reflectivity integral film (10) of claim 1, wherein The reflective coating (113) is provided with a plurality of reflective coatings (113), all of which are arranged corresponding to the gap region of the battery string (40).
4. The high-reflectivity integral film (10) of claim 1, wherein The first rough surface (121) is provided with a first embossed pattern.
5. The high-reflectivity integral film (10) of claim 1, wherein The second rough surface (131) is provided with a second embossed pattern.
6. The high-reflectivity integral film (10) according to any one of claims 1 to 5, characterized in that The first adhesive film (12) is an EVA adhesive film or a POE adhesive film.
7. The high-reflectivity integral film (10) according to any one of claims 1 to 5, characterized in that The second adhesive film (13) is an EVA adhesive film or a POE adhesive film.
8. The high-reflectivity integral film (10) according to any one of claims 1 to 5, characterized in that The thickness of the base body (11) is 95-105 μm.
9. The high-reflectivity integral film (10) according to any one of claims 1 to 5, characterized in that The thickness of the reflective coating (113) is 15-25 μm.
10. A photovoltaic module, characterized by, Comprising a front cover plate (20), an encapsulating adhesive film (30), a battery string (40), a back cover plate (50) and the high-reflection integrated film (10) according to any one of claims 1-9, the front cover plate (20) and the back cover plate (50) being transparent, the front cover plate (20), the encapsulating adhesive film (30), the battery string (40), the high-reflection integrated film (10) and the back cover plate (50) being arranged in sequence, the first adhesive film (12) being connected to the battery string (40), the second adhesive film (13) being connected to the back cover plate (50), and the reflective coating (113) being arranged corresponding to the gap region of the battery string (40).