Photovoltaic module frame and photovoltaic module system

Abstract

This application relates to a photovoltaic module frame and a photovoltaic module system. The photovoltaic module frame includes: a mounting portion for fixing the photovoltaic module; and a support portion located below and connected to the mounting portion. The surface of the support portion facing the photovoltaic module is parabolic, and the surface of the parabolic surface has a plurality of recesses arranged in an array. In this application, the parabolic surface of the support portion facing the photovoltaic module in the photovoltaic module frame facilitates secondary reflection and focusing of light transmitted through the photovoltaic module into the photovoltaic module, thereby improving the light reflectivity of the photovoltaic module frame. Furthermore, because the surface of the parabolic surface has a plurality of recesses arranged in an array, the array of recesses not only improves the light reflectivity transmitted through the photovoltaic module but also achieves a light-concentrating effect, thereby increasing the light energy density and improving the uniformity of the light field.

Description

Technical Field

[0001] This application relates to the field of solar energy, and in particular to a photovoltaic module frame and a photovoltaic module system. Background Technology

[0002] In response to the increasingly serious environmental pollution caused by the use of traditional energy sources, the green renewable energy industry has developed rapidly in recent years. Photovoltaic module technology, which uses the photovoltaic effect to generate electricity, is an important green energy technology.

[0003] The frame of a photovoltaic (PV) module is a crucial component for securing the PV module. It not only facilitates installation but also provides a seal. Currently, aluminum frames are the mainstream choice for PV module frames. However, current PV module frames have low reflectivity, and their light utilization efficiency still needs improvement. Utility Model Content

[0004] Based on this, this application provides a photovoltaic module frame and its preparation method, as well as a photovoltaic module, which improves the UV degradation of the heterojunction photovoltaic module frame while controlling the short-circuit current loss and conversion efficiency loss of the heterojunction photovoltaic module frame within a low range.

[0005] In a first aspect, embodiments of this application provide a photovoltaic module frame, including:

[0006] Mounting section, used to fix photovoltaic modules;

[0007] The support part is located below and connected to the mounting part. The surface of the support part facing the photovoltaic module is parabolic, and the surface of the parabolic surface has several pits arranged in an array.

[0008] In some embodiments of this application, the depth-to-diameter ratio of the recess ranges from 1:1.2 to 1:1.5.

[0009] In some embodiments of this application, the depth of the pit is 1mm-8mm and the diameter of the pit is 1.2mm-12mm.

[0010] In some embodiments of this application, the spacing between adjacent pits is 2mm-8mm.

[0011] In some embodiments of this application, the inner wall surface of the recess is an arc surface.

[0012] In some embodiments of this application, the mounting section includes a receiving groove for placing and fixing photovoltaic modules.

[0013] In some embodiments of this application, the support portion includes a first support portion and a second support portion, the top surface of the first support portion is connected to the bottom surface of the mounting portion, and the second support portion is in contact with the lower portion of the side of the first support portion facing the photovoltaic module.

[0014] In some embodiments of this application, the parabolic surface includes a first parabolic surface and a second parabolic surface, and the recess includes a first recess and a second recess;

[0015] The side of the first support facing the photovoltaic module is a first parabolic surface, and the surface of the first parabolic surface has a plurality of first pits arranged in an array.

[0016] The surface of the second support facing the photovoltaic module is a second parabola, and the surface of the second parabola has a number of second pits arranged in an array.

[0017] In some embodiments of this application, the first parabolic surface is an asymmetric parabolic surface;

[0018] The second parabola is an asymmetric parabola.

[0019] Secondly, embodiments of this application also provide a photovoltaic module system, including:

[0020] The aforementioned photovoltaic module frame;

[0021] Photovoltaic modules, mounted on the frame of the photovoltaic module.

[0022] The embodiments of this application may have, or at least have, the following advantages:

[0023] This application embodiment includes a photovoltaic module frame and a photovoltaic module system. The photovoltaic module frame includes: a mounting part for fixing the photovoltaic module; and a support part located below and connected to the mounting part. The surface of the support part facing the photovoltaic module is parabolic, and the surface of the parabolic surface has a plurality of recesses arranged in an array. In this application, the parabolic surface of the support part facing the photovoltaic module in the photovoltaic module frame is advantageous for secondary reflection and focusing of light transmitted through the photovoltaic module into the photovoltaic module, thereby improving the light reflectivity of the photovoltaic module frame and improving the light utilization rate. Furthermore, since the surface of the parabolic surface has a plurality of recesses arranged in an array, the array of recesses can enhance the diffuse reflection of light transmitted through the photovoltaic module, thereby improving the light reflectivity of light transmitted through the photovoltaic module and achieving a light-gathering effect (light-gathering gain greater than 110%), which increases the light energy density and improves the light field uniformity (light field uniformity greater than 90%). Therefore, it increases the back-side power generation efficiency and back-side power generation of the photovoltaic module, further improving the application of the photovoltaic module in low light conditions.

[0024] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the photovoltaic module frame provided in some embodiments of this application;

[0027] Figure 2 for Figure 1 A cross-sectional view along the cutting line AB.

[0028] Explanation of reference numerals in the attached figures:

[0029] Photovoltaic module frame - 101; Mounting part - 102; Support part - 103; First support part - 104; Second support part - 105; Receiving slot - 106; Photovoltaic module - 201;

[0030] Side - 11; Surface - 12; Dent - 13; First Dent - 13a; Second Dent - 13b; Light - 15. Detailed Implementation

[0031] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0033] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, parts, regions, layers, doping types, and / or portions, these elements, parts, regions, layers, doping types, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, part, region, layer, doping type, or portion from another element, part, region, layer, doping type, or portion. Therefore, without departing from the teachings of this application, the first element, part, region, layer, doping type, or portion discussed below may be referred to as a second element, part, region, layer, or portion.

[0034] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0035] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, in this specification, the term “and / or” includes any and all combinations of the associated listed items.

[0036] The structure of the embodiments of this application should not be limited to the specific shape shown in the accompanying drawings, but should include shape deviations due to, for example, manufacturing techniques.

[0037] It is understood that in the accompanying drawings of this application, some adjacent membrane layers with the same processed membrane material are drawn as connected to make them resemble the actual structure.

[0038] Therefore, the first aspect of this application provides a photovoltaic module frame. Figure 1 This is a schematic diagram of the structure of the photovoltaic module frame provided in some embodiments of this application; Figure 2 for Figure 1 A cross-sectional view along the cutting line AB.

[0039] refer to Figure 1 and Figure 2 The photovoltaic module frame 101 includes:

[0040] Mounting part 102 is used to fix photovoltaic module 201;

[0041] The support part 103 is located below the mounting part 102 and connected to the mounting part 102. The surface of the support part 103 facing the photovoltaic module 201 is parabolic, and the surface of the parabolic surface has a plurality of pits 13 arranged in an array.

[0042] In this application, the surface of the support portion 103 facing the photovoltaic module 201 in the photovoltaic module frame 101 is parabolic, which is beneficial for reflecting the light 15 transmitted through the photovoltaic module 201 a second time and focusing it into the photovoltaic module, thereby increasing the light reflectivity of the photovoltaic module frame 101 and improving the light utilization rate. Furthermore, since the surface of the parabolic surface has a plurality of pits 13 arranged in an array, the array of pits 13 can enhance the diffuse reflection of the light 15 transmitted through the photovoltaic module 201, thereby increasing the reflectivity of the light 15 transmitted through the photovoltaic module 201 and achieving a light-concentrating effect (concentration gain greater than 110%), which increases the energy density of the light and improves the uniformity of the light field (light field uniformity greater than 90%). Therefore, the back-side power generation efficiency and back-side power generation of the photovoltaic module are increased, further enhancing the application of the photovoltaic module in low light conditions.

[0043] If the depth-to-diameter ratio of the recess 13 is too large or too small, the effect of improving the diffuse reflection effect, the light focusing effect, and the light field uniformity will be weakened. In some embodiments, the depth-to-diameter ratio of the recess 13 is in the range of 1:1.2 to 1:1.5, which achieves better diffuse reflection and light focusing effects, while further improving the light energy density and the light field uniformity.

[0044] If the depth of the recess 13 is too deep, it will affect the diffuse reflection of light; if the depth is too shallow, it will be detrimental to light focusing. If the diameter of the recess 13 is too large, it will also be detrimental to light focusing; if the diameter is too small, it will affect the diffuse reflection of light. If the spacing between adjacent recesses 13 is too small, it will also affect the diffuse reflection of light; if the spacing is too large, it will affect the uniformity of the plaza. In a specific example, the depth of the recess 13 is 1mm-8mm, the diameter of the recess 13 is 1.2mm-12mm, and the spacing between adjacent recesses 13 is 2mm-8mm. This improves the reflectivity of light 15 while achieving a better light focusing effect, and at the same time further improves the energy density and uniformity of the light field.

[0045] In some embodiments, the inner wall surface of the recess 13 is an arc surface, which is beneficial for diffuse reflection and light focusing.

[0046] In some embodiments, the mounting portion 102 includes a receiving groove 106 for placing and fixing the photovoltaic module 201.

[0047] The support portion 103 is used to support the mounting portion 102. In one embodiment, the support portion 103 includes a first support portion 104 and a second support portion 105. The top surface of the first support portion 104 is connected to the bottom surface of the mounting portion 102, and the second support portion 105 contacts the lower part of the side of the first support portion 104 facing the photovoltaic module 201 to improve the firmness and stability of the support. In addition, the sides of the first support portion 104 and the second support portion 105 facing the photovoltaic module can be processed into an arc surface of material pits 13, which allows more light 15 to be reflected by the sides of the first support portion 104 and the second support portion 105 facing the photovoltaic module, thereby achieving a better light-gathering effect and further improving the energy density and uniformity of the light field.

[0048] In one specific embodiment, the parabolic surface includes a first parabolic surface and a second parabolic surface, and the recess 13 includes a first recess 13a and a second recess 13b;

[0049] The side 11 of the first support portion 104 facing the photovoltaic module 201 is a first parabolic surface, and the surface of the first parabolic surface has a plurality of first pits 13a arranged in an array.

[0050] The surface 12 of the second support 105 facing the photovoltaic module 201 is a second parabola, and the surface of the second parabola has a plurality of second pits 13b arranged in an array.

[0051] In some embodiments, the depth-to-diameter ratio of the first recess 13a ranges from 1:1.2 to 1:1.5. In a specific example, the depth of the first recess 13a is 1mm-8mm, the diameter of the first recess 13a is 1.2mm-12mm, and the spacing between adjacent first recesses 13a is 2mm-8mm. This allows the side 11 of the first support portion 104 facing the photovoltaic module 201 to reflect more light 15, achieving a better light-concentrating effect, and further improving the energy density and uniformity of the light field.

[0052] In some embodiments, the depth-to-diameter ratio of the second recess 13b ranges from 1:1.2 to 1:1.5. In a specific example, the depth of the second recess 13b is 1mm-8mm, the diameter of the second recess 13b is 1.2mm-12mm, and the spacing between adjacent first recesses 13a is 2mm-8mm. This allows the surface 12 of the second support 105 facing the photovoltaic module 201 to reflect more light 15, achieving a better light-concentrating effect, and further improving the energy density and uniformity of the light field.

[0053] In some embodiments, the first parabola is an asymmetric parabola; the second parabola is an asymmetric parabola. In some embodiments, the first and second parabolas satisfy the equation of an asymmetric parabola: y 2 =8x, where the focal diameter ratio is 0.25 and the focal length is f=2mm. According to Fermat's principle, a parabola can accommodate incident angles θ≤30°. 。 The light 15 transmitted through the photovoltaic module 201 is refocused onto the photovoltaic module 201. The focus offset control formula is: Δf = 0.03tanθ (θ is the solar altitude angle) to improve the focusing effect of the light and maximize the amount of light reflected onto the photovoltaic module. Simulation verification shows that the light-gathering efficiency η of the first parabolic surface with the first pit 13a array and the second parabolic surface with the second pit 13b array is ≥85%, reaching 85%-95% (compared to 62.3% for a plane mirror). Furthermore, based on Mie scattering theory, this application uses a first parabolic surface and a second parabolic surface that satisfy the aforementioned asymmetric parabolic surface equation. When λ = 400-1100nm: the forward scattering ratio is 68%, and the half-width of the scattering angle distribution is θ. 1 / 2 =22.5°, which improves the utilization rate of light. The scattering angle is the angle between the direction of the incident light and the direction of the scattered light. The scattering ratio usually refers to the proportion of the scattering process in the total optical interaction (including scattering and absorption), and is used to quantify the scattering contribution of particles to the incident light.

[0054] This application provides a photovoltaic module system, referencing... Figure 2 ,include:

[0055] The aforementioned photovoltaic module frame 101;

[0056] Photovoltaic module 201, mounting part 102 fixed to the photovoltaic module frame 101.

[0057] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0058] 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 of 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.

[0059] The above embodiments merely illustrate 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 photovoltaic module frame, characterized in that, include: Mounting section, used to fix photovoltaic modules; A support portion is located below and connected to the mounting portion. The surface of the support portion facing the photovoltaic module is parabolic, and the surface of the parabolic surface has a plurality of pits arranged in an array.

2. The photovoltaic module frame according to claim 1, characterized in that, The depth-to-diameter ratio of the pit is in the range of 1:1.2 to 1:1.

5.

3. The photovoltaic module frame according to claim 1 or 2, characterized in that, The depth of the pit is 1mm-8mm, and the diameter of the pit is 1.2mm-12mm.

4. The photovoltaic module frame of claim 3, wherein, The spacing between adjacent pits is 2mm-8mm.

5. The photovoltaic module frame of claim 1 or 2, wherein, The inner wall surface of the pit is an arc surface.

6. The photovoltaic module frame of claim 1, wherein, The mounting section includes a receiving groove for placing and securing the photovoltaic module.

7. The photovoltaic module frame according to claim 1, characterized in that, The support includes a first support and a second support. The top surface of the first support is connected to the bottom surface of the mounting part, and the second support is in contact with the lower part of the side of the first support facing the photovoltaic module.

8. The photovoltaic module frame according to claim 7, characterized in that, The parabolic surface includes a first parabolic surface and a second parabolic surface, and the concave surface includes a first concave surface and a second concave surface; The side of the first support portion facing the photovoltaic module is a first parabolic surface, and the surface of the first parabolic surface has a plurality of first pits arranged in an array. The surface of the second support facing the photovoltaic module is a second parabola, and the surface of the second parabola has a plurality of second pits arranged in an array.

9. The photovoltaic module frame of claim 8, wherein, The first parabola is an asymmetric parabola; The second parabola is an asymmetric parabola.

10. A photovoltaic module system, characterized in that, include: The photovoltaic module frame according to any one of claims 1-9; A photovoltaic module, fixed to the mounting part of the photovoltaic module frame.

Images