Light reflecting film for photovoltaic module

Abstract

The utility model relates to photovoltaic module with improve the light reflection film of light reflection rate, relate to photovoltaic technical field, including weather protection layer, weather protection layer below pastes has the light reflection regulation layer, light reflection regulation layer below pastes has the reinforcing layer. In actual use, light enters the upper micro prism of half cylinder structure and spreads to all around, and then most light enters the bottom micro prism and is refracted and spreads out after passing the lower protective support layer, and the reflectivity of light can reach above 95% through the cooperation of multiple structures, and the light reflected by the bottom micro convex mirror, a small part of light is totally reflected through the middle micro prism of the bottom surface of half concave lens, and most light will spread to all around after being refracted by the half concave lens, and will not spread vertically, so most of the reflected light can enter the peripheral photovoltaic panel and generate electricity, so not only the reflectivity is high, but also the light amount refracted to the photovoltaic panel is larger, and the power generation efficiency of the photovoltaic panel is improved.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic technology, specifically to a reflective film for improving reflectivity in photovoltaic modules. Background Technology

[0002] With the rapid development of the new energy industry, photovoltaic power generation, as a clean and sustainable energy utilization method, has been widely promoted and applied. Photovoltaic modules are the core components of photovoltaic power generation systems, and their photoelectric conversion efficiency directly affects the power generation performance of the entire photovoltaic power generation system. In practical applications, gaps exist between the cells of photovoltaic modules, and some light rays can reach the frame or non-light-receiving areas of the photovoltaic modules. This light cannot be effectively absorbed by the cells, thus limiting the overall photoelectric conversion efficiency of the photovoltaic modules.

[0003] To improve the photoelectric conversion efficiency of photovoltaic modules, existing technologies typically place reflective films in the non-light-receiving areas of the photovoltaic modules to reflect light that would otherwise not be absorbed by the cells back to the cell surface, thereby increasing the amount of light received by the cells.

[0004] However, existing reflective films for photovoltaic modules have the problem of low reflectivity. Most reflective films can only achieve a reflectivity of 85%-90%, and the biggest problem is that most of this light is vertically dispersed in all directions and cannot be utilized by the photovoltaic panel in large quantities. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing a reflective film for photovoltaic modules to improve reflectivity.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a weather-resistant protective layer, a reflective adjustment layer is pasted below the weather-resistant protective layer, and a reinforcing layer is pasted below the reflective adjustment layer; The reflective adjustment layer includes multiple upper microprisms, a semi-concave lens is attached below the upper microprisms, and a middle microprism is attached to the bottom surface of the semi-concave lens. Multiple bottom microprisms are connected below the multiple medium microprisms by a protective support layer, and a bottom micro convex mirror is integrally formed between two of the bottom microprisms.

[0007] The weather-resistant protective layer, reflective adjustment layer, protective support layer, and reinforcing layer are bonded together with polyurethane adhesive, which has a thickness of 5-10 μm. This prevents peeling between the three layers. At the same time, the polyurethane adhesive has a certain degree of elasticity, which can mitigate the impact of changes in the external environment on the structure of each layer of the reflective film and improve the overall structural stability of the reflective film.

[0008] The beneficial effects of this invention are as follows: In practical use, light passes through the weather-resistant protective layer and enters the protective support layer. A portion of the light enters the upper microprism of the semi-cylindrical structure, where it is refracted and dispersed in all directions, thus increasing the reflectivity of the top surface of the semi-concave lens. Subsequently, most of the light passes through the lower protective support layer and enters the lower microprism. Due to the total internal reflection principle of the bottom microprism with its equilateral triangular prism structure, the light is refracted and dispersed outwards. Furthermore, the addition of a bottom microconvex mirror between the bottom microprisms avoids the problem of weak reflection at the bottom of the microprism, allowing the light to be reflected in all directions. In this way, a portion of the light enters the bottom micro-convex mirror for total internal reflection. Through the cooperation of multiple structures, the reflectivity of the light can reach over 95%. A small portion of the light reflected by the bottom micro-convex mirror undergoes total internal reflection through the medium micro-prism on the bottom surface of the semi-concave lens, preventing the bottom of the semi-concave lens from affecting the light transmission. Most of the light is refracted by the semi-concave lens and then disperses in all directions, rather than perpendicularly. This allows most of the reflected light to enter the surrounding photovoltaic panels for power generation. This not only results in high reflectivity but also a large amount of light refracted onto the photovoltaic panels, improving the power generation efficiency of the photovoltaic panels.

[0009] Furthermore, a vacuum-plated aluminum layer is provided between the semi-concave lens and the upper and middle microprisms. The vacuum-plated aluminum layer can improve the reflectivity of light and prevent some light from passing through the semi-concave lens, the upper microprism, and the middle microprism.

[0010] Furthermore, both the intermediate microprism and the bottom microconvex mirror are regular triangular prism structures, and the intermediate microprism and the bottom microconvex mirror are oriented in opposite directions. Multiple intermediate microprisms and bottom microconvex mirrors are placed in parallel. The height of the intermediate microprism and the bottom microconvex mirror is 1-12 μm, and the distance between two adjacent microprism structures is 15-25 μm.

[0011] Furthermore, the upper microprism has a semi-cylindrical structure, and the upper microprism is bonded to the weather-resistant protective layer through a protective support layer.

[0012] Furthermore, the adhesive reinforcement layer includes an interleaved titanium dioxide layer and a silicon dioxide layer. When it is necessary to maximize the reflectivity, the titanium dioxide layer and silicon dioxide layer can be used to increase the reflectivity to over 98%.

[0013] Furthermore, an adhesive layer is adhered to the bottom surface of the silica layer, and release paper is adhered to the adhesive layer. The adhesive layer is made of acrylic pressure-sensitive adhesive with a thickness of 15-25μm. The acrylic pressure-sensitive adhesive effectively avoids bubbles, wrinkles, and peeling. The release paper can prevent the adhesive layer from being contaminated during transportation and improving its performance. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a structural diagram of the semi-concave lens of this utility model; Figure 3 This is a structural diagram of the bottom microconvex mirror of this utility model; Figure 4 This is a structural diagram of the titanium dioxide layer of this utility model.

[0015] The attached diagram lists the components represented by each number as follows: 1. Weather-resistant protective layer; 2. Reflective adjustment layer; 21. Upper microprism; 22. Semi-concave lens; 221. Vacuum-plated aluminum layer; 23. Middle microprism; 24. Protective support layer; 25. Bottom microprism; 26. Bottom microconvex mirror; 3. Reinforcing layer; 31. Titanium dioxide layer; 32. Silica layer; 33. Adhesive layer; 34. Release paper. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0018] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0019] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" or "below" of other elements or features will be oriented "above" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0020] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application. Example

[0021] Figure 1 A structural diagram of a reflective film for improving reflectivity in photovoltaic modules provided in this embodiment of the present invention is shown below. Figure 1 , Figure 2 and Figure 3 As shown, there is a weather-resistant protective layer 1, a reflective adjustment layer 2 is pasted below the weather-resistant protective layer 1, and a reinforcing layer 3 is pasted below the reflective adjustment layer 2. Among them, the reflective adjustment layer 2 includes multiple upper microprisms 21, a semi-concave lens 22 is attached below the upper microprisms 21, and a middle microprism 23 is attached to the bottom surface of the semi-concave lens 22. Multiple micro prisms 23 are connected to multiple bottom micro prisms 25 via a protective support layer 24 below them, and a bottom micro convex mirror 26 is integrally formed between two bottom micro prisms 25.

[0022] The weather-resistant protective layer 1, the reflective adjustment layer 2, the protective support layer 24, and the reinforcing layer 3 are bonded together with polyurethane adhesive, which has a thickness of 5-10μm. This prevents peeling between the three layers. At the same time, the polyurethane adhesive has a certain degree of elasticity, which can mitigate the impact of changes in the external environment on the structure of each layer of the reflective film and improve the overall structural stability of the reflective film.

[0023] Figure 2 This is a structural diagram of the semi-concave lens of this utility model; Figure 3 This is a structural diagram of the bottom microconvex mirror of this utility model. (See diagram below.) Figure 2 and Figure 3 As shown, a vacuum-plated aluminum layer 221 is provided between the semi-concave lens 22 and the upper microprism 21 and the middle microprism 23. The vacuum-plated aluminum layer 221 can improve the reflectivity of light and prevent some light from passing through the semi-concave lens 22, the upper microprism 21 and the middle microprism 23.

[0024] Both the intermediate microprism 23 and the bottom microconvex mirror 26 are regular triangular prism structures, and the intermediate microprism 23 and the bottom microconvex mirror 26 are oriented in opposite directions. Multiple intermediate microprisms 23 and bottom microconvex mirrors 26 are placed in parallel. The height of the intermediate microprism 23 and the bottom microconvex mirror 26 is 1-12 μm, and the distance between two adjacent microprism structures is 15-25 μm.

[0025] The upper microprism 21 has a semi-cylindrical structure and is bonded to the weather-resistant protective layer 1 through the protective support layer 24. Example

[0026] Figure 4 This is a structural diagram of the titanium dioxide layer of this utility model. Based on Example 1, the embodiments of this utility model can be further improved as follows, such as... Figure 4 As shown, the adhesive reinforcement layer 3 includes a titanium dioxide layer 31 and a silicon dioxide layer 32 that are bonded together in an interleaved manner. When it is necessary to maximize the reflectivity, the titanium dioxide layer 31 and the silicon dioxide layer 32 can be used to increase the reflectivity to more than 98%.

[0027] An adhesive layer 33 is attached to the bottom surface of the silica layer 32, and a release paper 34 is attached to the adhesive layer 33. The adhesive layer 33 is made of acrylic pressure-sensitive adhesive with a thickness of 15-25μm. The acrylic pressure-sensitive adhesive effectively avoids bubbles, wrinkles and peeling. The release paper 34 can prevent the adhesive layer 33 from being contaminated during transportation and improve its performance.

[0028] Working principle: During the installation of the reflective film, the release paper 34 is peeled off, and the reflective film is pasted into the gap of the photovoltaic panel through the adhesive layer 33. In actual use, light enters the protective support layer 24 through the weather-resistant protective layer 1. Some of the light enters the upper microprism 21 of the semi-cylindrical structure and is refracted by the upper microprism 21, thus diffusing outwards. This increases the reflectivity of the top surface of the semi-concave lens 22. Subsequently, most of the light enters the lower microprism 25 through the lower protective support layer 24. Due to the total internal reflection principle of the bottom microprism 25 of the equilateral triangular prism structure, the light is refracted and diffused outwards. The addition of a bottom microconvex mirror 26 between the bottom of the bottom microprism 25 can prevent the bottom of the bottom microprism 25 from having a weak reflective effect. The problem is that the light can be reflected in all directions. In this way, some of the light enters the bottom micro-convex mirror 26 for total internal reflection. With the cooperation of multiple structures, the reflectivity of the light can reach more than 95%. Some of the light that penetrates the bottom micro-convex mirror 26 is reflected by the titanium dioxide layer 31 and the silicon dioxide layer 32, which can achieve a reflectivity of more than 98%. A small part of the light reflected by the bottom micro-convex mirror 26 is completely internally reflected by the medium micro prism 23 on the bottom surface of the semi-concave lens 22, so as to avoid the bottom of the semi-concave lens 22 affecting the light transmission. Most of the light is refracted by the semi-concave lens 22 and then disperses in all directions, and does not disperse vertically. In this way, most of the reflected light can enter the surrounding photovoltaic panels to generate electricity.

[0029] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A reflective film for improving reflectivity in photovoltaic modules, characterized in that, include: Weather-resistant protective layer (1), a reflective adjustment layer (2) is pasted below the weather-resistant protective layer (1), and a reinforcing layer (3) is pasted below the reflective adjustment layer (2); The reflective adjustment layer (2) includes multiple upper microprisms (21), a semi-concave lens (22) is attached below the upper microprisms (21), and a middle microprism (23) is attached to the bottom surface of the semi-concave lens (22). Multiple bottom microprisms (25) are connected below the multiple mid-micro prisms (23) by a protective support layer (24), and a bottom micro convex mirror (26) is integrally formed between two of the bottom microprisms (25).

2. The reflective film for improving reflectivity in photovoltaic modules according to claim 1, characterized in that, The semi-concave lens (22) has a vacuum-plated aluminum layer (221) between it and the upper microprism (21) and the middle microprism (23).

3. The reflective film for improving reflectivity in photovoltaic modules according to claim 1, characterized in that, The intermediate micro prism (23) and the bottom micro convex mirror (26) are both regular triangular prism structures, and the intermediate micro prism (23) and the bottom micro convex mirror (26) are in opposite directions. Multiple intermediate micro prisms (23) and bottom micro convex mirrors (26) are placed in parallel.

4. The reflective film for improving reflectivity in photovoltaic modules according to claim 1, characterized in that, The upper microprism (21) has a semi-cylindrical structure and is bonded to the weather-resistant protective layer (1) through a protective support layer (24).

5. The reflective film for improving reflectivity in photovoltaic modules according to claim 4, characterized in that, The reinforcing layer (3) includes an interleaved titanium dioxide layer (31) and a silicon dioxide layer (32).

6. The reflective film for improving reflectivity in photovoltaic modules according to claim 5, characterized in that, An adhesive layer (33) is attached to the bottom surface of the silica layer (32), and release paper (34) is attached to the adhesive layer (33).

Images