Photovoltaic frame and photovoltaic module

Abstract

The invention relates to the technical field of solar cell manufacturing, in particular to a photovoltaic frame and a photovoltaic assembly, the photovoltaic frame comprises a top supporting plate, a bottom supporting plate and a connecting plate, the top supporting plate and the bottom supporting plate are arranged in parallel, and the connecting plate is located on the same side of the top supporting plate and the bottom supporting plate and connects the top supporting plate and the bottom supporting plate; the two ends of the top supporting plate are respectively cut off to form notches, the two ends of the connecting plate are respectively cut off to form notches, and the notches and the notches located at the same ends of the top supporting plate and the connecting plate form water outlets. According to the photovoltaic frame, the notches are formed in the two ends of the top supporting plate, the notches are formed in the two ends of the connecting plate, the notches and the notches form the drainage openings for drainage, accumulated dust and accumulated water on the surface of the photovoltaic module can be efficiently discharged through the drainage openings, the overall loading capacity of the photovoltaic frame is improved, and meanwhile the photovoltaic frame has the efficient drainage and accumulated dust cleaning capacity.

Description

Technical Field

[0001] The present application relates to the technical field of solar cell manufacturing, and in particular to a photovoltaic frame and a photovoltaic module. Background Art

[0002] With the development of the photovoltaic industry, more and more photovoltaic modules are being put into power generation. Due to the different latitudes of the users' locations, in order to make the laminate face the sun, the laminate needs to be tilted toward the ground when installing it. As the latitude decreases, the tilt angle will also become larger.

[0003] The photovoltaic frame generally includes surface A, surface B and surface C. Surface A and surface C are arranged parallel to each other, and surface B is located on the same side of surface A and surface C and connects the two, that is, surface B is perpendicular to surface A and surface C respectively. When there is water and dust accumulation on the surface of the laminate, due to the effect of surface A at the top of the photovoltaic frame, surface A is higher than the height of the top of the laminate, and there is a height difference between surface A and the laminate. It is difficult for the accumulated water and dust to flow over surface A of the photovoltaic frame. The accumulated water and dust accumulate on surface A of the photovoltaic frame for a long time, which will affect the power generation of the photovoltaic module.

[0004] In the related art, the photovoltaic frame will adopt a non-A-side structural design so that the accumulated water and dust on the laminate can be discharged, but the photovoltaic frame without the A-side structural design has the risk of insufficient load capacity and installation method. Therefore, it is very important to design a photovoltaic frame with an A-side structural design that can efficiently drain the accumulated water and dust.

[0005] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Summary of the invention

[0006] The embodiments of the present application provide a photovoltaic frame and a photovoltaic module to solve or alleviate one or more of the technical problems mentioned above.

[0007] As a first aspect of an embodiment of the present application, an embodiment of the present application provides a photovoltaic frame, including: A top support plate, a bottom support plate and a connecting plate, wherein the top support plate and the bottom support plate are arranged parallel to each other, and the connecting plate is located on the same side of the top support plate and the bottom support plate and connects the two; A section is cut off at each end of the top support plate to form an incision, and a section is cut off at each end of the connecting plate to form a gap. The incision and the gap at the same end of the top support plate and the connecting plate form a drainage outlet.

[0008] Optionally, the cutting direction of the incision forms an angle of 15° to 45° with respect to the connecting plate.

[0009] Optionally, the length of the notch is 5 to 60 mm.

[0010] Optionally, the incision is a linear incision or an arc-shaped incision.

[0011] Optionally, a rounded corner is provided on an upper edge of the connecting plate close to the notch.

[0012] Optionally, a water diversion groove is provided on the side of the incision, and the water diversion groove is used to guide the accumulated water to the drain port for discharge.

[0013] As a second aspect of an embodiment of the present application, an embodiment of the present application provides a photovoltaic assembly, including: laminates; and The photovoltaic frame mentioned above; Two adjacent photovoltaic frames are connected and fixed by angle codes, and a first drainage channel is formed between the two adjacent photovoltaic frames.

[0014] Optionally, the photovoltaic frame further comprises a transverse plate, the transverse plate is arranged between the top support plate and the bottom support plate, the transverse plate is arranged between the top support plate and the bottom support plate, a mounting groove for mounting and fixing the laminate is formed between the transverse plate and the top support plate, and a clearance gap communicating with the first drainage channel is arranged between the chamfered structure of the laminate and the transverse plate; A section is cut off at each end of the bottom support plate to form a first clearance opening, and a section is cut off at each end of the horizontal plate to form a second clearance opening connected to the clearance gap; A second drainage channel is formed between the angle code and the horizontal plate after a section is cut off; the first easing opening and the second easing opening located at the same end are both connected to the second drainage channel.

[0015] Optionally, a through hole is provided through the angle code, and the through hole is connected to the clearance gap.

[0016] Optionally, in two adjacent photovoltaic frames, the length of the notch of one of the photovoltaic frames is 5-30 mm and is shorter than the length of the notch of the other photovoltaic frame, and the length of the notch of the other photovoltaic frame is 20-60 mm.

[0017] The above technical solution adopted in the embodiment of the present application may have the following advantages: By setting cutouts at both ends of the top support plate and notches at both ends of the connecting plate, the cutouts and notches form drainage outlets for drainage, so that dust and water accumulated on the surface of the photovoltaic modules can be efficiently discharged through the drainage outlets, thereby improving the overall load capacity of the photovoltaic frame while also having efficient drainage and dust cleaning capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0019] Figure 1 It is a schematic diagram of the structure of the photovoltaic assembly provided in the embodiment of the present application.

[0020] Figure 2 yes Figure 1 Enlarged view of part A.

[0021] Figure 3 It is a schematic diagram of the partial structure of the photovoltaic module provided in the embodiment of the present application.

[0022] Figure 4 It is a schematic diagram of the partial structure of the photovoltaic module provided in the embodiment of the present application, so as to illustrate the connection relationship with the laminate.

[0023] Figure 5 It is a schematic diagram of the local structure of the photovoltaic frame provided in an embodiment of the present application.

[0024] Figure 6 It is a schematic diagram of the structure of the angle code provided in the embodiment of the present application.

[0025] Description of reference numerals: 1. Top support plate; 11. Cutout; 12. Water diversion channel; 2. Bottom support plate; 21. First clearance opening; 3. Connecting plate; 31. Notch; 32. Rounded corner; 4. Horizontal plate; 41. Second clearance opening; 5. Mounting groove; 6. Drainage outlet; 7. Laminated part; 71. Chamfered structure; 8. First drainage channel; 9. Corner code; 91. Through hole; 10. Clearance gap; 20. Second drainage channel. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted that these exemplary embodiments can be implemented in many different forms and should not be construed as being limited to the embodiments described herein.

[0029] like Figures 1 to 6 As shown, the photovoltaic frame may include: A top support plate 1, a bottom support plate 2 and a connecting plate 3, wherein the top support plate 1 and the bottom support plate 2 are arranged parallel to each other, and the connecting plate 3 is located on the same side of the top support plate 1 and the bottom support plate 2 and connects the two; A section is cut off at both ends of the top support plate 1 to form an incision 11, and a section is cut off at the upper edge of both ends of the connecting plate 3 to form a notch 31. The incision 11 and the notch 31 located at the same end of the top support plate 1 and the connecting plate 3 form a drainage port 6.

[0030] In this embodiment, by setting a cutout 11 at both ends of the top support plate 1 and a notch 31 at both ends of the connecting plate 3, the cutout 11 and the notch 31 form a drain port 6 for drainage, so that dust and water accumulated on the surface of the photovoltaic module can be efficiently discharged through the drain port 6, thereby improving the overall load capacity of the photovoltaic frame while also having an efficient drainage and dust cleaning capability. It should be noted that the two ends of the photovoltaic frame are usually the gathering areas of dust and water. On rainy days, rainwater on the surface of the laminate 7 is affected by gravity and the inclination of the photovoltaic frame, and will naturally gather at the two ends, and at the same time, it can bring the dust to the two ends, so that the accumulated water and dust are discharged from the drain port 6, which improves the smoothness of the discharge of the accumulated water and dust; and the drain port 6 is set at both ends of the photovoltaic frame for easy observation and cleaning, and it does not require large-scale disassembly of the equipment for inspection and maintenance, which greatly reduces the difficulty of work. In addition, the drain port 6 is set at both ends of the photovoltaic frame, which has little effect on the overall mechanical properties of the photovoltaic frame, and can maintain the strength of the photovoltaic frame when it is subjected to external forces (such as wind load or snow load) to a large extent.

[0031] In an optional embodiment, the cutting direction of the incision 11 forms an angle of 15° to 45° with respect to the connecting plate 3 , that is, the cutting angle of the incision 11 may be 15°, 20°, 25°, 30°, 35°, 40° and 45°.

[0032] In this embodiment, the cutting angle of the cutout 11 changes with the size of the installed laminate 7. When the size of the laminate 7 is larger, the cutting angle of the cutout 11 is smaller, which can increase the drainage area of ​​the drain 6 and facilitate the discharge of rainwater and dust. In addition, compared with the vertical cutout 11 (90°), the cutting angle of 15°~45° reduces the probability of dust accumulation stagnating at the drain 6. The cutout 11 of 15°~45° is more helpful to smoothly bring the dust moving with the water flow out of the drain 6, avoiding the accumulation of dust in the photovoltaic frame. In addition, the cross-sectional area shape of the cutout 11 of 15°~45° is smoother, which can disperse the concentrated force of external loads (such as wind loads or snow loads) on the cutout 11, thereby reducing the risk of cracking or damage of the photovoltaic frame in long-term use.

[0033] In an optional embodiment, the length of the notch 31 is 5 to 60 mm. The length of the notch 31 can be 5 mm, 20 mm, 30 mm, 50 mm, and 60 mm. The length of the notch 31 varies with the size of the installed laminate 7. When the size of the laminate 7 is larger, the length of the notch 31 is longer, which can increase the drainage area of ​​the drain port 6, making it easier to discharge rainwater and dust.

[0034] In an optional embodiment, the incision 11 is a linear incision or an arcuate incision. In the embodiment of the present application, the incision 11 is an arcuate incision.

[0035] In this embodiment, linear cuts or arc cuts can be applied to different scenarios. For areas with frequent rainstorms, linear cuts can be used. The linear cuts provide a straight first drainage channel 8, and rainwater can flow out quickly along a straight line, reducing the resistance on the water flow path, and can guide a large amount of accumulated water to drain out more quickly. The arc cut can make the water flow more smoothly from the cut 11, avoiding turbulence and eddy currents; and the edges of the arc cut are smoother and less likely to form sharp corners, which helps to avoid dust deposition. At the same time, the arc cut has a more uniform stress distribution under the action of mechanical force, and is less likely to cause cracking or deformation of the photovoltaic frame. Therefore, the arc cut is more suitable for high-end products or environments that require long-term durability. .

[0036] In an optional embodiment, the upper edge of the connecting plate 3 near the notch 31 is provided with a rounded corner 32. The provision of the rounded corner 32 can make the accumulated water and dust more smoothly discharged from the notch 31, further improving the efficiency of draining the accumulated water and dust.

[0037] In an optional embodiment, a water guide groove 12 is provided on the side of the cutout 11, and the water guide groove 12 is used to guide the accumulated water to the drain port 6 for discharge. The water guide groove 12 can guide the accumulated water on the surface of the laminate 7 to the two end areas, so that the accumulated water and dust can be discharged more easily from the drain port 6, reducing the problem of water accumulation. In a second aspect, an embodiment of the present application discloses a photovoltaic module, the photovoltaic module comprising: a laminate 7; and The photovoltaic frame of any of the above embodiments; Two adjacent photovoltaic frames are connected and fixed by corner codes 9, and the drainage openings 6 of the two adjacent photovoltaic frames form a first drainage channel 8. It should be noted that after the photovoltaic module is formed, the number of first drainage channels 8 is four and they are distributed at the four corners of the photovoltaic module, so that the accumulated water and dust can be discharged along the first drainage channels 8 at both ends of each photovoltaic frame, realizing dual-channel drainage.

[0038] In an optional embodiment, the photovoltaic frame also includes a transverse plate 4, which is arranged between the top support plate 1 and the bottom support plate 2, and the transverse plate 4 is arranged between the top support plate 1 and the bottom support plate 2. A mounting groove 5 for mounting and fixing a laminate 7 is formed between the transverse plate 4 and the top support plate 1, and a clearance gap 10 connected to the first drainage channel 8 is provided between the chamfered structure 71 of the laminate 7 and the transverse plate 4; a section is cut off at both ends of the bottom support plate 2 to form a first clearance opening 21, and a section is cut off at both ends of the transverse plate 4 to form a second clearance opening 41 connected to the clearance gap; a section is cut off from the corner code 9 to form a second drainage channel 20 between the cross plate 4; the first clearance opening 21 and the second clearance opening 41 located at the same end are both connected to the second drainage channel 20. In the embodiment of the present application, when the edge of the laminate 7 is arranged in the installation groove 5, a sealing structure is also arranged between the laminate 7 and the installation groove 5, so that the laminate 7 is fixed on the photovoltaic frame, which can protect the laminate 7 and reduce the entry of rainwater and dust into the interior of the photovoltaic module; and no sealing structure is arranged between the four chamfered structures 71 of the laminate 7 and the cross plate 4, thereby forming a gap 10 that is conducive to drainage.

[0039] In this embodiment, when the accumulated water and dust are less, the accumulated water and dust are discharged from the surface of the laminate 7 through the make way gap 10, the second make way port 41, the second drainage channel 20 and the first make way port 21 in sequence; and when the accumulated water and dust are more, the accumulated water and dust are not only discharged from the second drainage channel 20, but also discharged from the first drainage channel 8 at both ends of each photovoltaic frame, thereby achieving a three-channel drainage effect, greatly improving the drainage and ash removal efficiency and effect.

[0040] In some embodiments, the radius of the chamfer structure 71 is 10-20 mm. It should be noted that the four chamfer structures 71 of the laminate are arranged with large chamfer structures, so that a larger clearance gap 10 is formed between the chamfer structure 71 and the horizontal plate 4 to facilitate the discharge of accumulated water and dust.

[0041] In some embodiments, the material of the sealing structure is a kind of silicone or double-sided tape. In the embodiment of the present application, the sealing structure can be made of silicone; the silicone material has excellent elasticity and flexibility, strong buffering effect, and improves the overall reliability of the component. In addition, it can effectively fill the gap between the laminate 7 and the connecting plate 3 to prevent dust, moisture and other pollutants from entering the interior of the component. The silicone material also has excellent weather resistance, can withstand the common outdoor environmental influences of photovoltaic components such as ultraviolet radiation, acid rain, salt spray, etc., and has a long service life. The double-sided tape material has strong initial adhesion and lasting adhesion, which can firmly fix the photovoltaic frame and the laminate 7 together. At the same time, the construction is relatively simple, reducing the difficulty and working hours of installation.

[0042] In an optional embodiment, a through hole 91 is provided through the corner bracket 9, and the through hole 91 is connected to the clearance gap 10. The accumulated water and dust can also be discharged from the through hole 91 of the corner bracket, further improving the efficiency of water and dust discharge.

[0043] In some embodiments, the cross-section of the shape of the cut-off section of the corner bracket 9 can be one of square, rectangular, "L" shape, trapezoid and prism. It should be noted that the shape of the cut-off section of the corner bracket 9 can be adjusted according to actual production requirements, so as to maintain a good drainage and ash removal effect while not affecting the structural strength of the corner bracket.

[0044] In an optional embodiment, in two adjacent photovoltaic frames, the length of the notch 31 of one photovoltaic frame is 5 to 30 mm and is shorter than the length of the notch 31 of the other photovoltaic frame, and the length of the notch 31 of the other photovoltaic frame is 20 to 60 mm. It should be noted that when installing and fixing the laminate 7, four photovoltaic frames are generally used, two short-side photovoltaic frames arranged oppositely, and two long-side photovoltaic frames arranged oppositely, so as to install and fix the four sides of the laminate 7. Therefore, in two adjacent photovoltaic frames, there is generally a short-side photovoltaic frame and a long-side photovoltaic frame.

[0045] In this embodiment, in two adjacent photovoltaic frames, the length of the notch 31 of the short side photovoltaic frame is 5~30mm, and the length of the notch 31 of the long side photovoltaic frame is 20~60mm; the length of the notch 31 of the short side photovoltaic frame is smaller than the length of the notch 31 of the long side photovoltaic frame; the length of the notch 31 of the long side photovoltaic frame is larger so that the accumulated water and dust can be better drawn out from the long side photovoltaic frame after the photovoltaic module is installed horizontally, while the length of the notch 31 of the short side photovoltaic frame is smaller so that the installation range of mounting parts such as pressing blocks can be wider when the short side photovoltaic frame of the photovoltaic module is installed.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] For the convenience of description, the orientation or position relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, vertical, horizontal" and "top, bottom" is usually based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these directional words 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 cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here are interpreted accordingly.

[0048] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection 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 specific circumstances.

[0049] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0051] It should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0052] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0053] It should also be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A photovoltaic frame, characterized in that: include: A top support plate (1), a bottom support plate (2) and a connecting plate (3), wherein the top support plate (1) and the bottom support plate (2) are arranged parallel to each other, and the connecting plate (3) is located on the same side of the top support plate (1) and the bottom support plate (2) and connects the two; A section is cut off at each end of the top support plate (1) to form a cutout (11), and a section is cut off at each end of the connecting plate (3) to form a notch (31). The cutout (11) and the notch (31) located at the same end of the top support plate (1) and the connecting plate (3) form a drainage port (6).

2. The photovoltaic frame according to claim 1, characterized in that: The cutting direction of the incision (11) forms an angle of 15° to 45° with respect to the connecting plate (3).

3. The photovoltaic frame according to claim 1, characterized in that: The length of the notch (31) is 5 to 60 mm.

4. The photovoltaic frame according to claim 1, characterized in that: The incision (11) is a linear incision or an arc-shaped incision.

5. The photovoltaic frame according to claim 1, characterized in that: The upper edge of the connecting plate (3) close to the notch (31) is provided with a rounded corner (32).

6. The photovoltaic frame according to claim 1, characterized in that: A water diversion groove (12) is provided on the side of the incision (11), and the water diversion groove (12) is used to guide the accumulated water to the drainage port (6) for discharge.

7. A photovoltaic module, characterized in that: include: Laminate (7); as well as The photovoltaic frame according to any one of claims 1 to 6; Two adjacent photovoltaic frames are connected and fixed via an angle code (9), and the drainage openings (6) of the two adjacent photovoltaic frames form a first drainage channel (8).

8. The photovoltaic module according to claim 7, characterized in that: The photovoltaic frame further comprises a transverse plate (4), wherein the transverse plate (4) is arranged between the top support plate (1) and the bottom support plate (2), wherein a mounting groove (5) for mounting and fixing a laminate (7) is formed between the transverse plate (4) and the top support plate (1), and a clearance gap (10) communicating with the first drainage channel (8) is arranged between the chamfered structure (71) of the laminate (7) and the transverse plate (4); A section is cut off at each end of the bottom support plate (2) to form a first clearance opening (21), and a section is cut off at each end of the horizontal plate (4) to form a second clearance opening (41) connected to the clearance gap; A second drainage channel (20) is formed between the angle code (9) and the transverse plate (4) by cutting off a section of the angle code (9); the first clearance opening (21) and the second clearance opening (41) located at the same end are both connected to the second drainage channel (20).

9. The photovoltaic module according to claim 8, characterized in that: The angle code (9) is provided with a through hole (91) penetrating therethrough, and the through hole (91) is communicated with the clearance gap (10).

10. The photovoltaic module according to claim 7, characterized in that: In two adjacent photovoltaic frames, the length of the notch (31) of one photovoltaic frame is 5-30 mm and is shorter than the length of the notch (31) of the other photovoltaic frame, and the length of the notch (31) of the other photovoltaic frame is 20-60 mm.

Images