Light guide structure and photovoltaic panel for facade

Abstract

A light guide structure and a photovoltaic panel for a facade, the light guide structure comprises an optical device, photovoltaic glass and a light guide assembly, the optical device is used for uniformly diffusing and projecting solar rays to the photovoltaic assembly for the facade of the photovoltaic panel for the facade, so that the photovoltaic assembly for the facade can generate required electric power; the photovoltaic glass is provided with a light incident plane and a light emergent plane, and the optical device is packaged on one side of the light emergent plane, so that solar rays can enter the photovoltaic glass from the light incident plane and are emitted towards the optical device from the light emergent plane; the light guide assembly comprises an anti-reflection film layer and a reflection increasing film layer, and the anti-reflection film layer is arranged on the surface, away from the optical device, of the photovoltaic glass so as to increase the transmittance of a light incident plane and / or reduce the reflectivity of the light incident plane; the reflection enhancing film layer is arranged on the surface, facing the optical device, of the photovoltaic glass so as to enhance the reflectivity of the light emergent surface and ensure the stability and reliability of the light guide structure.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic panels, in particular to a light guide structure and a photovoltaic panel for a facade. Background Art

[0002] Photovoltaic panels for facades refer to devices that use the photovoltaic effect of semiconductor materials under light conditions to directly convert solar energy into electrical energy. However, the photovoltaic glass in the light-guiding structure has a certain thickness and will still reflect some light during use, affecting the photoelectric conversion rate, making a lot of energy unusable, thereby reducing the rated power generation. Utility Model Content

[0003] The utility model provides a light-guiding structure and a photovoltaic panel for a facade, which can effectively reduce the reflection loss of sunlight when it is incident on the surface of an optical device, so that more sunlight can enter the interior of the optical device to participate in photoelectric conversion, thereby improving the power generation efficiency of the photovoltaic panel for the facade.

[0004] According to a first aspect of the present invention, the present invention provides a light guide structure for guiding sunlight to a photovoltaic module for a facade, the light guide structure comprising:

[0005] An optical device, wherein the optical device is used to evenly diffuse the sunlight and project it onto the photovoltaic module for the facade, so that the photovoltaic module for the facade can generate the required electricity;

[0006] Photovoltaic glass, the photovoltaic glass having a light incident surface and a light exit surface, the optical device being packaged on one side of the light exit surface, so that the sunlight can enter the photovoltaic glass from the light incident surface and be emitted toward the optical device from the light exit surface;

[0007] A light guide component, the light guide component comprising an anti-reflection and anti-reflection film layer and an enhancing reflection film layer, the anti-reflection and anti-reflection film layer is arranged on the surface of the photovoltaic glass facing away from the optical device to increase the transmittance of the light incident surface and / or reduce the reflectivity of the light incident surface; the enhancing reflection film layer is arranged on the surface of the photovoltaic glass facing the optical device to enhance the reflectivity of the light exit surface.

[0008] In the light-guiding structure of one embodiment of the utility model, the photovoltaic glass includes a front layer of glass and a rear layer of glass, a hollow cavity is formed between the front layer of glass and the rear layer of glass, the optical device is encapsulated in the hollow cavity, and the anti-reflection and anti-transmission film layer and the anti-reflection film layer are provided on both sides of the front layer of glass and the rear layer of glass.

[0009] In the light-guiding structure of one embodiment of the present invention, the anti-reflection and anti-reflection film layer is connected to the front glass and the rear glass by gluing; and / or the anti-reflection film layer is connected to the front glass and the rear glass by gluing.

[0010] In the light-guiding structure of one embodiment of the utility model, the thickness of the anti-reflection and anti-reflection film layer is 300nm-500nm; and / or the thickness of the anti-reflection film layer is 50-300μm.

[0011] In the light guide structure of one embodiment of the utility model, the thickness of the front layer of glass and the rear layer of glass is 1-5 mm.

[0012] In the light guide structure of one embodiment of the utility model, the shortest distance between the light emitting surface of the front layer of glass and the optical device is in the range of 12 mm to 13 mm.

[0013] In the light-guiding structure of one embodiment of the present invention, the anti-reflection and anti-reflection film layer is an anti-reflection and anti-reflection film layer made of magnesium fluoride or titanium dioxide by electron beam evaporation and metal deposition or ion beam assisted deposition.

[0014] In the light guiding structure of one embodiment of the utility model, the anti-reflection film layer includes a first film layer and a second film layer, the second film layer is stacked on the side of the first film layer away from the photovoltaic glass, and the refractive index of the first film layer is smaller than the refractive index of the second film layer.

[0015] In the light guide structure of one embodiment of the present utility model, the refractive index of the first film layer is 1.4 to 2.1, and the refractive index of the second film layer is 1.8 to 2.4.

[0016] In the light guide structure of one embodiment of the utility model, the optical device includes a light guide plate and a convex lens, the convex lens is arranged on the side of the light guide plate away from the photovoltaic component for the facade, and is used to converge the sunlight to the light guide plate; the light guide plate is used to evenly diffuse the converged sunlight and project it onto the photovoltaic component for the facade.

[0017] In the light guiding structure of one embodiment of the utility model, the optical device includes a concave mirror, which is arranged between the light guiding plate and the convex lens, and is used to reflect the deviated sunlight to the surface of the convex lens, and then form a sunlight beam after being converged by the convex lens and then incident on the light guiding plate.

[0018] In the light guide structure of one embodiment of the utility model, the optical device includes a packaging structure, which is fixed to the side of the light guide plate away from the facade photovoltaic assembly and has a transparent cavity, and the convex lens and the concave mirror are packaged in the transparent cavity.

[0019] In the light guiding structure of one embodiment of the utility model, a light absorbing portion is provided on the light guiding plate, the concave mirror is arranged around the light absorbing portion, and the position of the convex lens corresponds to the position of the light absorbing portion, so that the sunlight passing through the packaging structure can be collected at the light absorbing portion through the convex lens.

[0020] In the light guide structure of one embodiment of the present utility model, a protruding structure is provided on the light guide plate, the light absorbing portion is formed on the protruding structure, and the concave mirror is fixed on the protruding structure.

[0021] In the light guide structure of one embodiment of the utility model, the light guide plate includes a transparent substrate and a diffuser plate, and the diffuser plate is arranged on one side or both sides of the transparent substrate to uniformly project the solar beams collected on the transparent substrate to the photovoltaic components on the facade.

[0022] According to the second aspect of the utility model, the utility model also provides a photovoltaic panel for facade, including a photovoltaic module for facade and a plurality of the above-mentioned light-guiding structures, wherein the light-guiding structures are arranged on the photovoltaic module for facade, and are used to uniformly guide sunlight to the photovoltaic module for facade.

[0023] The technical solution provided by the embodiments of the present application may include the following beneficial effects: the present application designs a light-guiding structure and a photovoltaic panel for a facade, the light-guiding structure includes an optical device, photovoltaic glass and a light-guiding assembly, the optical device is encapsulated on one side of the light emitting surface, the anti-reflection and anti-transmittance film layer of the light-guiding assembly is arranged on the surface of the photovoltaic glass away from the optical device to increase the transmittance of the light incident surface and / or reduce the reflectivity of the light incident surface; the anti-reflection film layer of the light-guiding assembly is arranged on the surface of the photovoltaic glass facing the optical device to enhance the reflectivity of the light incident surface, reduce the loss of light energy and obtain high conversion efficiency, effectively reduce the reflection loss of sunlight when it is incident on the surface of the optical device, so that more sunlight can enter the interior of the optical device to participate in photoelectric conversion, and improve the power generation efficiency of the photovoltaic panel for the facade.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic diagram of the optical path of an optical device provided by an embodiment of the present application;

[0027] Figure 2 yes Figure 1 A schematic diagram of the structure of the optical device in FIG.

[0028] Figure 3 It is a schematic diagram of the structure of a photovoltaic panel for a facade provided in one embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100. Optical devices

[0031] 10. light guide plate; 11. protruding structure; 111. light absorbing part;

[0032] 20. concave mirror; 30. convex lens; 40. packaging structure; 41. transparent cavity;

[0033] 200, photovoltaic glass; 201, front glass; 202, rear glass;

[0034] 300, light guide component; 301, anti-reflection and anti-reflection film layer; 302, anti-reflection film layer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should also be understood that the terms used in this utility model specification are only for describing specific realities. In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] like Figures 1 to 3 As shown, according to the first aspect of the present application, the present application provides a light-guiding structure, which uses a facade photovoltaic panel to guide sunlight to the facade photovoltaic components of the facade photovoltaic panel, so that the facade photovoltaic components can use sunlight to generate the required electricity. It has a clever design, a simple structure, good practicality, and a high value for promotion and application.

[0039] In an optional embodiment, the light-guiding structure includes an optical device 100, which is used to evenly diffuse the solar rays and project them onto the facade photovoltaic assembly, so that the facade photovoltaic assembly can generate required electricity.

[0040] In an optional embodiment, the light-guiding structure includes a photovoltaic glass 200 having a light incident surface and a light exiting surface, and the optical device 100 is encapsulated on one side of the light exiting surface, so that sunlight can enter the photovoltaic glass 200 from the light incident surface and be emitted from the light exiting surface toward the optical device 100.

[0041] In an optional embodiment, the light guiding structure includes a light guiding component 300, and the light guiding component 300 includes an anti-reflection and anti-reflection film layer 301 and an enhancing reflection film layer 302. The anti-reflection and anti-reflection film layer 301 is arranged on the surface of the photovoltaic glass 200 facing away from the optical device 100 to increase the transmittance of the light incident surface and / or reduce the reflectivity of the light incident surface; the enhancing reflection film layer 302 is arranged on the surface of the photovoltaic glass 200 facing the optical device 100 to enhance the reflectivity of the light exit surface, reduce the loss of light energy and obtain high conversion efficiency, effectively reduce the reflection loss of sunlight when it is incident on the surface of the optical device 100, enable more sunlight to enter the interior of the optical device 100 to participate in photoelectric conversion, and improve the power generation efficiency of the photovoltaic panel for the facade.

[0042] After adopting the above technical solution, when the sunlight irradiates the light-guiding structure, the sunlight enters the optical device 100 from the light incident surface. Since the anti-reflection and anti-reflection film layer 301 is provided on the light incident surface, it has the function of reducing the light reflectivity and increasing the light transmittance, thereby effectively reducing the reflection loss of the sunlight when it is incident on the surface of the optical device 100, so that more sunlight enters the optical device 100 to participate in the photoelectric conversion. Then, when the sunlight enters the photovoltaic glass 200 and is emitted from the light exit surface, since the light exit surface is provided with an anti-reflection film layer 302, it can reflect sunlight of a specific angle or range, and reflect the light that may originally deviate from the effective receiving range of the photovoltaic component back to the direction of the component, thereby improving the utilization rate of the light. Therefore, the present application can improve the quality and efficiency of receiving sunlight and significantly improve the power generation efficiency by providing the anti-reflection and anti-reflection film layer 301 on the light incident surface and the anti-reflection film layer 302 on the light exit surface.

[0043] Exemplarily, the present application accurately calculates the optical parameters of the anti-reflection and anti-reflection film layer 301 and the anti-reflection film layer 302 after analyzing the solar illumination data of the area where the photovoltaic panels for the facade are used. The optical parameters may include but are not limited to the refractive index gradient of the anti-reflection and anti-reflection film, the reflection spectrum range and reflection angle of the anti-reflection and anti-reflection film, etc., to ensure that the anti-reflection and anti-reflection film layer 301 and the anti-reflection and anti-reflection film layer 302 can adapt to the lighting conditions of the photovoltaic panels for the facade during use, and achieve the best light optimization effect. Secondly, the anti-reflection and anti-reflection film layer 301 is carefully bonded to the outer surface of the photovoltaic glass 200 according to the predetermined bonding process, and during the bonding process, professional bonding equipment and tools are used to ensure that the anti-reflection and anti-reflection film layer 301 is evenly and tightly attached to the photovoltaic glass 200 without bubbles or wrinkles, so as to ensure that the bonding quality of the anti-reflection and anti-reflection film layer 301 meets the requirements. Then, the anti-reflection film layer 302 is precisely bonded to the inner side of the photovoltaic glass 200, and installed according to the calculated position and angle parameters. Suitable adhesives and bonding techniques are used to firmly adhere the anti-reflection film layer 302 to the photovoltaic glass 200 to ensure that its optical performance is not affected. Finally, the photovoltaic glass 200 with the anti-reflection and anti-reflection film layer 301 and the anti-reflection film layer 302 cured is installed on the outside of the optical device 100, and the photovoltaic glass 200 is tightly connected to the frame or support structure of the optical device 100 using sealant or mechanical fixing methods to form a complete sealed structure. In the installation process, care should be taken to avoid damage to the anti-reflection and anti-reflection film layer 301, the anti-reflection film layer 302 and the photovoltaic glass 200, etc., to ensure the stability and reliability of the entire optical system.

[0044] In an optional embodiment, a protective wear-resistant film layer is provided on the side of the anti-reflection and anti-reflection film layer 301 away from the photovoltaic glass 200 , and the protective wear-resistant film layer can provide protection for the photovoltaic glass 200 to prevent the photovoltaic glass 200 from being worn.

[0045] In an optional embodiment, the photovoltaic glass 200 includes a front layer of glass 201 and a rear layer of glass 202, a hollow cavity is formed between the front layer of glass 201 and the rear layer of glass 202, the optical device 100 is encapsulated in the hollow cavity, and both sides of the front layer of glass 201 and the rear layer of glass 202 are provided with an anti-reflection and anti-transmittance film layer 301 and an anti-reflection film layer 302, so that the sunlight can be reflected in the hollow cavity and then gathered to the light absorbing part 111 of the optical device 100, and then evenly diffused by the light guide plate 10 and projected onto the photovoltaic module for the facade, so that the photovoltaic module for the facade can receive sunlight that is relatively parallel and perpendicular to the module, thereby reducing the reduction in rated power generation caused by changes in the solar azimuth and incident angle.

[0046] In an optional implementation, the AR film layer 301 is connected to the front glass layer 201 and the rear glass layer 202 by gluing.

[0047] In an optional implementation, the anti-reflection film layer 302 is connected to the front glass layer 201 and the rear glass layer 202 by bonding.

[0048] In an optional embodiment, the thickness of the anti-reflection and anti-reflection film layer 301 is 300nm to 500nm to ensure that the photovoltaic glass 200 meets all national industry standards after being tempered. The anti-reflection and anti-reflection film layer 301 is made of magnesium fluoride or titanium dioxide by electron beam evaporation and ion beam assisted deposition, forming a protective wear-resistant film layer on the outermost layer to increase the hardness of the photovoltaic glass 200 and prevent scratches.

[0049] In an optional embodiment, the thickness of the anti-reflection film layer 302 is 50-300 μm.

[0050] In an optional embodiment, the thickness of the front glass 201 and the rear glass 202 is 1-5 mm.

[0051] In an optional embodiment, the shortest distance between the light emitting surface of the front glass 201 and the optical device 100 is in the range of 12 mm to 13 mm, to ensure that the sunlight can be absorbed by the optical device 100 after being reflected in the hollow cavity, thereby improving the light conversion efficiency.

[0052] In an optional embodiment, the anti-reflection and anti-reflection film layer 301 is an anti-reflection and anti-reflection film layer 301 made of magnesium fluoride or titanium dioxide by electron beam evaporation and metal deposition or ion beam assisted deposition.

[0053] In an optional embodiment, the anti-reflection film layer 302 includes a first film layer and a second film layer, and the second film layer is stacked on the side of the first film layer away from the photovoltaic glass 200. The refractive index of the first film layer is smaller than the refractive index of the second film layer, so as to increase the reflectivity of the photovoltaic glass 200 on the light emitting surface, simplify the processing technology, and achieve lower costs.

[0054] In an optional embodiment, the refractive index of the first film layer is 1.4-2.1, and the refractive index of the second film layer is 1.8-2.4.

[0055] In an optional embodiment, the optical device 100 includes a light guide plate 10 and a convex lens 30. The convex lens 30 is arranged on a side of the light guide plate 10 away from the facade photovoltaic module, and is used to converge the sunlight to the light guide plate 10; the light guide plate 10 is used to evenly diffuse the converged sunlight and project it onto the facade photovoltaic module, so that the facade photovoltaic module can receive sunlight that is relatively parallel and perpendicular to the module, thereby reducing the rated power generation reduction caused by changes in the solar azimuth and incident angle.

[0056] Exemplarily, there is a first preset angle β between the central axis L2 of the convex lens 30 and the central axis L1 of the light guide plate 10. The first preset angle β is mainly set according to the latitude information of the area where the photovoltaic components for the facade are used to ensure that it can effectively collect nearly parallel sunlight onto the light guide plate 10, reduce the energy loss of sunlight during the conduction process, and effectively increase the actual power generation of the photovoltaic panels for the facade.

[0057] In an optional embodiment, the optical device 100 also includes a concave mirror 20, which is arranged between the light guide plate 10 and the convex lens 30, and is used to reflect the offset sunlight to the surface of the convex lens 30, and after being converged by the convex lens 30 to form a solar beam, it is incident on the light guide plate 10, so that the sunlight can be better reflected onto the facade photovoltaic module, thereby avoiding the loss of light energy caused by changes in the solar azimuth and the incident angle, so that the facade photovoltaic panel can automatically collect and adjust the sunlight according to the rising and setting of the sun and the change of the azimuth, with the help of the convex lens 30 and the concave reflector, and then project the light onto the facade photovoltaic module through the light guide plate 10 according to the designed light path, so that the facade photovoltaic module can receive sunlight that is relatively parallel and perpendicular to the module, thereby reducing the rated power generation reduction caused by changes in the solar azimuth and the incident angle, and improving the power generation efficiency of the facade photovoltaic panel.

[0058] Exemplarily, there is a second preset angle between the central axis of the concave mirror 20 and the light guide plate 10, and the second preset angle is positively correlated with or equal to the first preset angle, so that the photovoltaic panel on the facade can avoid the loss of light energy caused by changes in the solar azimuth and incident angle, and can even gather sunlight at different times of the day or in four seasons without using a solar tracking system.

[0059] In an optional embodiment, the concave mirror 20 can also be a reflector with a concave structure similar to a spherical mirror and a wavy mirror. Its main purpose is to increase the reflection intensity of sunlight and thereby improve the power generation efficiency of the photovoltaic panel for the facade. This application is not limited thereto.

[0060] In an optional embodiment, the optical device 100 further includes a packaging structure 40, which is fixed to the side of the light guide plate 10 away from the facade photovoltaic assembly and has a transparent cavity 41, and the convex lens 30 and the concave mirror 20 are packaged in the transparent cavity 41 to prevent the convex lens 30 and the concave mirror 20 from being affected by pollutants such as moisture or dust. The packaging structure 40 includes but is not limited to tempered glass.

[0061] Exemplarily, when the optical device 100 is packaged by the packaging structure 40, the packaging structure 40 is fixed on the light guide plate 10 according to a predetermined installation position to ensure the firmness and horizontality of the installation of the packaging structure 40; then, according to the latitude information of the area where the facade photovoltaic panel is used, with reference to the solar incident angle data in the area and the design parameters of the convex lens 30, the appropriate position and angle of the convex lens 30 on the packaging structure 40 are determined, so that the convex lens 30 can effectively collect approximately parallel sunlight onto the light guide plate 10; then, the concave mirror 20 is installed at an appropriate position in the transparent cavity 41, and the reflective surface of the concave mirror 20 is facing one side of the convex lens 30 to achieve the best light reflection effect.

[0062] It should be noted that the convex lens 30 is fixed to the packaging structure 40 by gluing, and during the gluing process of the convex lens 30, the surface of the convex lens 30 is ensured to be clean and free of stains and scratches to ensure a good light convergence effect. When the packaging structure 40 is installed on the light guide plate 10, the side with the convex lens 30 should be facing the incident direction of the sunlight, and the installation needs to be stable to avoid shaking or displacement, which affects the transmission path of the sunlight in the packaging structure 40.

[0063] In an optional embodiment, a light absorbing portion 111 is provided on the light guide plate 10, and the concave mirror 20 is arranged around the light absorbing portion 111. The position of the convex lens 30 corresponds to the position of the light absorbing portion 111, so that the sunlight passing through the packaging structure 40 can be collected at the light absorbing portion 111 through the convex lens 30, and then the light guide plate 10 projects the sunlight onto the facade photovoltaic module according to the designed light path, so that the facade photovoltaic module can receive sunlight that is relatively parallel and perpendicular to the module, thereby reducing the reduction in rated power generation caused by changes in the solar azimuth and incident angle.

[0064] It should be noted that after the convex lens 30 and the concave mirror 20 are packaged in the packaging structure 40, the position of the convex lens 30 corresponds to the position of the concave mirror 20 to ensure that its light absorption point can accurately receive the sunlight converged by the convex lens 30 and reflected by the concave mirror 20.

[0065] In an optional embodiment, a protruding structure 11 is provided on the light guide plate 10, a light absorbing portion 111 is formed on the protruding structure 11, and a concave mirror 20 is fixed on the protruding structure 11 to ensure the stability between the concave mirror 20 and the light guide plate 10, so that the concave mirror 20 will not loosen or fall off during the operation of the facade photovoltaic panel, thereby ensuring that the concave mirror 20 can be firmly connected to the end face of the light guide plate 10, avoiding the optical device 100 from being unusable due to the concave mirror 20 falling off.

[0066] In an optional embodiment, the outer side wall of the protruding structure 11 is provided with a first connecting portion, a through hole structure is formed in the middle of the concave mirror 20, and the inner side wall of the through hole structure is provided with a second connecting portion, and the second connecting portion is connected to the first connecting portion.

[0067] In an optional embodiment, the light guide plate 10 includes a transparent substrate and a diffuser, wherein the diffuser is disposed on one or both sides of the transparent substrate, and is used to evenly project the solar beams collected on the transparent substrate to the photovoltaic modules on the facade. The protruding structure 11 is formed on the transparent substrate, and the diffuser is used to scatter and disperse the incident light, so that the distribution of the solar light is more uniform.

[0068] In an optional embodiment, the diffuser plate includes a polycarbonate substrate and a diffusion layer disposed on the polycarbonate substrate, and aluminum ion particles are disposed inside the diffusion layer, so that the solar light beam is diffused by the aluminum ion particles in the diffusion layer after passing through the polycarbonate substrate and projected onto the photovoltaic module for the facade, so that the light projected onto the light guide plate 10 can be evenly diffused to form scattered light dispersed in all directions, so that the photovoltaic module for the facade can receive sunlight that is relatively parallel and perpendicular to the module, thereby reducing the reduction in rated power generation caused by changes in the solar azimuth and incident angle.

[0069] In an optional embodiment, the concave mirror 20 includes a concave substrate and a reflective layer, wherein the reflective layer is formed on the front surface of the concave substrate and is used to reflect the deflected sunlight to the surface of the convex lens 30 .

[0070] In an optional embodiment, the reflective layer includes a reflective sticker, and the reflective sticker is fixed to the front surface of the concave substrate by bonding.

[0071] In an optional embodiment, the reflective layer includes a metal coating layer, and the metal coating layer is formed on the front surface of the concave substrate by a coating process.

[0072] In an optional embodiment, the packaging structure 40 is a spherical lens made of a transparent optical material, and the convex lens 30 is pasted on top of the spherical lens to collect sunlight onto the light absorbing portion 111 of the light guide plate 10 .

[0073] In an optional embodiment, the ratio of the diameter of the spherical lens to the diameter of the convex lens 30 is in the range of 1 to 1.5, so as to allow a greater amount of incident sunlight to enter the convex lens 30 .

[0074] In an optional embodiment, the central axis of the convex lens 30 forms an angle of 30 to 40 degrees with the central axis of the spherical lens.

[0075] In an optional embodiment, the central axis of the convex lens 30 coincides with the central axis of the concave mirror 20 to ensure that the light absorbing portion 111 can accurately receive the sunlight converged by the convex lens 30 and reflected by the concave mirror 20 .

[0076] like Figures 1 to 3 As shown, according to the second aspect of the present application, the present application provides a photovoltaic panel for a facade, including a photovoltaic component for a facade and the above-mentioned light-guiding structure, wherein the light-guiding structure is arranged on the photovoltaic component for the facade to uniformly guide the sunlight to the photovoltaic component for the facade.

[0077] It should be noted that the light-guiding structure of the embodiment of the present application has the same technical effect as the light-guiding structure in the above-mentioned embodiments. Please refer to the relevant introduction of the above-mentioned embodiments, which will not be repeated here.

[0078] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0079] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0080] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A light-guiding structure for guiding sunlight to a photovoltaic module for a facade, the light-guiding structure comprising an optical device for uniformly diffusing sunlight and projecting it to the photovoltaic module for a facade, so that the photovoltaic module for a facade can generate the required electricity; characterized in that: The light guide structure further includes: Photovoltaic glass, the photovoltaic glass having a light incident surface and a light exit surface, the optical device being packaged on one side of the light exit surface, so that the sunlight can enter the photovoltaic glass from the light incident surface and be emitted toward the optical device from the light exit surface; A light guide component, the light guide component comprising an anti-reflection and anti-reflection film layer and an enhancing reflection film layer, the anti-reflection and anti-reflection film layer is arranged on the surface of the photovoltaic glass facing away from the optical device to increase the transmittance of the light incident surface and / or reduce the reflectivity of the light incident surface; the enhancing reflection film layer is arranged on the surface of the photovoltaic glass facing the optical device to enhance the reflectivity of the light exit surface.

2. The light guide structure according to claim 1, characterized in that: The photovoltaic glass comprises a front layer of glass and a rear layer of glass, a hollow cavity is formed between the front layer of glass and the rear layer of glass, the optical device is encapsulated in the hollow cavity, and the anti-reflection and anti-transmission film layer and the anti-reflection film layer are provided on both sides of the front layer of glass and the rear layer of glass.

3. The light guide structure according to claim 2, characterized in that: The anti-reflection and anti-reflection film layer is connected to the front layer of glass and the rear layer of glass by gluing; and / or the anti-reflection film layer is connected to the front layer of glass and the rear layer of glass by gluing.

4. The light guide structure according to claim 2, characterized in that: The thickness of the anti-reflection and anti-reflection film layer is 300nm-500nm; and / or the thickness of the anti-reflection film layer is 50-300μm; and / or the thickness of the front glass and the rear glass is 1-5mm.

5. The light guide structure according to claim 2, characterized in that: The shortest distance between the light emitting surface of the front layer of glass and the optical device is in the range of 12 mm to 13 mm.

6. The light guide structure according to claim 1, characterized in that: The anti-reflection and anti-reflection film layer is an anti-reflection and anti-reflection film layer made of magnesium fluoride or titanium dioxide by electron beam evaporation and metal deposition and ion beam assisted deposition.

7. The light guide structure according to claim 1, characterized in that: The anti-reflection film layer includes a first film layer and a second film layer. The second film layer is stacked on a side of the first film layer away from the photovoltaic glass. The refractive index of the first film layer is smaller than the refractive index of the second film layer.

8. The light guide structure according to claim 7, characterized in that: The refractive index of the first film layer is 1.4-2.1, and the refractive index of the second film layer is 1.8-2.

4.

9. The light guide structure according to claim 1, characterized in that: The optical device includes a light guide plate and a convex lens. The convex lens is arranged on a side of the light guide plate away from the photovoltaic assembly for the facade, and is used to converge the sunlight to the light guide plate; the light guide plate is used to evenly diffuse the converged sunlight and project it onto the photovoltaic assembly for the facade.

10. The light guide structure according to claim 9, characterized in that: The optical device comprises a concave mirror, which is arranged between the light guide plate and the convex lens and is used to reflect the deviated sunlight to the surface of the convex lens, and then the sunlight is converged by the convex lens to form a sunlight beam and then incident on the light guide plate.

11. The light guide structure according to claim 10, characterized in that: The optical device comprises a packaging structure, which is fixed on a side of the light guide plate away from the facade photovoltaic assembly and has a transparent cavity, in which the convex lens and the concave mirror are packaged.

12. The light guide structure according to claim 11, characterized in that: A light absorbing portion is disposed on the light guide plate, the concave mirror is disposed around the light absorbing portion, and the position of the convex lens corresponds to the position of the light absorbing portion, so that the sunlight passing through the packaging structure can be collected at the light absorbing portion through the convex lens.

13. The light guide structure according to claim 12, characterized in that: The light guide plate is provided with a protruding structure, the light absorbing portion is formed on the protruding structure, and the concave mirror is fixed on the protruding structure.

14. The light guide structure according to claim 9, characterized in that: The light guide plate includes a transparent substrate and a diffusion plate. The diffusion plate is arranged on one side or both sides of the transparent substrate and is used to evenly project the solar beams collected on the transparent substrate to the photovoltaic components on the facade.

15. A photovoltaic panel for a facade, characterized in that: It comprises a photovoltaic module for a facade and a plurality of light-guiding structures according to any one of claims 1 to 14, wherein the light-guiding structures are arranged on the photovoltaic module for a facade and are used to uniformly guide sunlight to the photovoltaic module for a facade.

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