Photovoltaic system

Abstract

The utility model relates to a photovoltaic system. The photovoltaic system comprises a purline, a laminated piece, a pressing block and a bonding layer. The pressing blocks are arranged on the purline and comprise the upper pressing block and the lower pressing block, and the upper pressing block and the lower pressing block are oppositely arranged in the first direction to form a cavity used for clamping the laminated piece. A gap is formed between the laminated piece and the purline, and the bonding layer is filled in the gap. Wherein the first direction is the thickness direction of the laminated piece. According to the photovoltaic system, the bonding layer can be used for improving the connection firmness between the laminated piece and the purline, the bonding firmness between the laminated piece and the purline can be improved while the design of a frame is omitted, and then the torsion resistance of the photovoltaic system is improved; and the phenomenon that dust is accumulated at the convex part of the surface due to the existence of the frame can also be reduced, so that the gravel can be conveniently removed.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic system. Background Art

[0002] With the rapid development of economy, the consumption of energy is increasing, and the storage of non-renewable resources such as coal and oil is decreasing, which has prompted people to explore new energy sources. Among them, as the source of many energies on the earth, solar energy occupies an important position in the research of new energy, and solar cells are a core representative of solar energy applications.

[0003] At present, photovoltaic modules usually include a laminate and a frame installed on the outer periphery of the laminate. In the process of forming a photovoltaic system, the photovoltaic module is generally fixed to the purlin by using a pressing block to fix the frame to the purlin. However, in this way, on the one hand, the setting of the frame is not conducive to the removal of dust on the surface of the photovoltaic module, and on the other hand, the joint between the laminate and the purlin is small under this installation method, and the torsion resistance is poor. Utility Model Content

[0004] Based on this, it is necessary to provide a photovoltaic system to facilitate the removal of gravel and improve the torsion resistance between the laminate and the purlin.

[0005] The present application provides a photovoltaic system, the photovoltaic system comprising:

[0006] purlin;

[0007] laminates;

[0008] A pressing block is arranged on the purlin, the pressing block comprises an upper pressing block and a lower pressing block, the upper pressing block and the lower pressing block are arranged opposite to each other along a first direction to form a cavity for clamping the laminate; and

[0009] An adhesive layer, wherein there is a gap between the laminate and the purlin, and the adhesive layer is filled in the gap;

[0010] Wherein, the first direction is the thickness direction of the laminate.

[0011] In one embodiment, the adhesive layer is organic silicon structural adhesive, acrylic structural adhesive, silicone structural adhesive, epoxy resin structural adhesive or polyurethane structural adhesive.

[0012] In one embodiment, the pressing block further comprises an upper pad and a lower pad located in the cavity, the upper pad is clamped to the upper pressing block, and the lower pad is clamped to the lower pressing block;

[0013] The upper pad and the lower pad are arranged opposite to each other and spaced apart along a first direction to form a clamping position for clamping the laminate.

[0014] In one embodiment, a first slot is provided on a side of the upper pressing block facing the lower pressing block, and a second slot is provided on a side of the lower pressing block facing the upper pressing block;

[0015] A first convex wing adapted to the first slot is provided on a side of the upper pad strip away from the lower pad strip, and a second convex wing adapted to the second slot is provided on a side of the lower pad strip away from the upper pad strip;

[0016] The upper pad is connected to the upper pressing block via the first convex wing and the first clamping groove, and the lower pad is connected to the lower pressing block via the second convex wing and the second clamping groove.

[0017] In one embodiment, the upper pad has a pressing surface for pressing on the laminate, and the lower pad has a bearing surface for bearing the laminate;

[0018] The pressing surface is configured as a rough surface; and / or the bearing surface is configured as a rough surface.

[0019] In one of the embodiments, the lower pressing block is configured to extend along the extension direction of the purlin;

[0020] The upper pressing block comprises a holding portion and a fixing portion staggered along the extending direction of the purlin, and a connecting portion connected between the holding portion and the fixing portion;

[0021] The fixing portion is placed on the lower pressing block, and the holding portion is spaced apart from the lower pressing block in a first direction to form the cavity.

[0022] In one of the embodiments, the dimension of the pressing portion along the extension direction of the purlin is 15 mm-20 mm.

[0023] In one of the embodiments, the photovoltaic system further comprises a fastener;

[0024] The fastener passes through the upper pressing block, the lower pressing block and the purlin to lock the laminate to the purlin.

[0025] In one of the embodiments, the purlin is provided with at least one locking hole;

[0026] The fastener passes through the upper pressing block, the lower pressing block and the locking hole to lock the laminate to the purlin;

[0027] Wherein, the locking hole is configured to extend longitudinally along the extension direction of the purlin.

[0028] In one embodiment, the laminate has a long side and a short side;

[0029] The short sides of the laminate and the extending direction of the purlin are parallel to each other;

[0030] Each purlin is provided with two pressing blocks located on both sides of the short side direction of the corresponding laminate.

[0031] In the technical solution of the present application, the laminate can be clamped and fixed between the upper pressing block and the lower pressing block by using the upper pressing block and the lower pressing block, and the adhesive layer can be filled in the gap between the laminate and the purlin. In this way, the adhesive layer can be used to improve the connection strength between the laminate and the purlin, and the frame design can be omitted while improving the bonding strength between the laminate and the purlin, thereby improving the torsional resistance of the photovoltaic system. In addition, since the design of the present application omits the frame, it can also reduce the accumulation of dust on the raised parts of the surface due to the existence of the frame, which is beneficial for the removal of sand and gravel, and can also reduce the design cost. It can also increase the freedom of the installation point of the pressing block relative to the laminate, and can also reduce the shielding of the laminate by the frame, thereby improving the utilization and absorption rate of sunlight by the photovoltaic system, and increasing the photoelectric conversion efficiency and power generation power of the photovoltaic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 shows a schematic structural diagram of a photovoltaic system according to an embodiment of the present application.

[0033] FIG. 2 shows an enlarged schematic diagram of point A in FIG. 1 .

[0034] FIG. 3 shows a partial cross-sectional view of a photovoltaic system according to an embodiment of the present application.

[0035] FIG. 4 shows a partial cross-sectional view of a purlin, an upper pressing block, a laminate, a lower pressing block and an adhesive layer according to an embodiment of the present application.

[0036] Reference numerals:

[0037] 10. Photovoltaic system;

[0038] 110, purlin; 111, locking hole;

[0039] 120, laminate; 121, long side; 122, short side;

[0040] 130, pressing block; 131, upper pressing block; 1311, first clamping groove; 1312, holding portion; 1313, fixing portion; 1314, connecting portion; 132, lower pressing block; 1321, second clamping groove; 133, upper pad; 1331, first convex wing; 1332, holding surface; 134, lower pad; 1341, second convex wing; 1342, bearing surface;

[0041] 140, bonding layer;

[0042] Q, cavity; j, gap;

[0043] 150. Fastener; 151. Bolt. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that if the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 the present application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] FIG1 shows a schematic structural diagram of a photovoltaic system 10 in an embodiment of the present application.

[0050] Please refer to FIG. 1 , and in combination with FIG. 2 and FIG. 3 , a photovoltaic system 10 provided in an embodiment of the present application includes a purlin 110 , a laminate 120 , a pressing block 130 , and an adhesive layer 140 .

[0051] The laminate 120 may include a 1 The cover plate, the battery string and the back plate are sequentially arranged, and the laminate 120 is sealed on the side of the laminate 120 by lamination, so that the battery string can be encapsulated between the cover plate and the back plate. Of course, the present application is not limited thereto, and the laminate 120 may also include a first direction F 1 The first adhesive film layer is disposed between the cover plate and the battery string, and along the first direction F 1 The second adhesive film layer is arranged between the battery string and the back plate, and the first adhesive film layer and the second adhesive film layer are used to encapsulate, bond and protect the battery string.

[0052] The pressing block 130 is disposed on the purlin 110. The pressing block 130 includes an upper pressing block 131 and a lower pressing block 132. The upper pressing block 131 and the lower pressing block 132 are arranged along the first direction F 1 The first direction F is opposite to the first direction F. 1 is the thickness direction of the laminate 120 .

[0053] A gap j is defined between the laminate 120 and the purlin 110 , and the adhesive layer 140 is filled in the gap j.

[0054] The bonding layer 140 refers to a structural layer that can be filled in the gap j between the laminate 120 and the purlin 110 and has a bonding function. For example, the bonding layer 140 can be a structural adhesive.

[0055] In this way, the upper pressing block 131 and the lower pressing block 132 can be used to clamp and fix the laminate 120 between the upper pressing block 131 and the lower pressing block 132, and the adhesive layer 140 can be filled in the gap j between the laminate 120 and the purlin 110, so that the adhesive layer 140 can be used to improve the connection strength between the laminate 120 and the purlin 110, and the frame design can be omitted while the bonding strength between the laminate 120 and the purlin 110 can be improved, thereby improving the torsion resistance of the photovoltaic system 10. In addition, since the design of the present application omits the frame, it can also reduce the phenomenon of dust accumulation at the raised part of the A surface due to the existence of the frame, and can also reduce the design cost. It can also increase the freedom of the installation point of the pressing block 130 relative to the laminate 120, and can also reduce the shielding of the laminate 120 by the frame, thereby improving the utilization rate and absorption rate of sunlight by the photovoltaic system 10, and increasing the photoelectric conversion efficiency and power generation power of the photovoltaic system 10.

[0056] In some embodiments, the adhesive layer is an organic silicon structural adhesive, an acrylic structural adhesive, a silicone structural adhesive, an epoxy resin structural adhesive, or a polyurethane structural adhesive.

[0057] Organic silicon structural adhesive is an adhesive material with excellent performance. It is composed of organic silicon polymer and has excellent temperature resistance, chemical corrosion resistance, weathering resistance, electrical insulation and mechanical properties. In this way, organic silicon structural adhesive can be used to improve the bonding strength between the laminate 120 and the purlin 110, and also improve the durability and reliability of the photovoltaic system 10.

[0058] Acrylic structural adhesive is a two-component structural adhesive. Agent A of acrylic structural adhesive can be applied to one bonding surface (i.e., the portion of the laminate 120 that needs to be bonded on the side facing the purlin 110), and agent B of acrylic structural adhesive can be applied to the other bonding surface (i.e., the portion of the purlin 110 that needs to be bonded on the side facing the laminate 120). The laminate 120 and the purlin 110 are then attached to each other and rubbed several times after attachment. In this way, the laminate 120 can be firmly bonded to the purlin 110.

[0059] The silicone structural adhesive can rely on the moisture in the air to cure into an excellent, durable, high modulus, and high elastic silicone rubber, which is convenient to use and can also firmly bond the laminate 120 to the purlin 110.

[0060] The epoxy resin structural adhesive can be used to improve the mechanical properties and flexural tear stress of the whole formed by bonding the laminate 120 and the purlin 110, and the laminate 120 can be firmly bonded to the purlin 110. In addition, the epoxy resin structural adhesive also has good electrical insulation and can withstand temperature changes.

[0061] The polyurethane structural adhesive can withstand large dynamic loads and static loads and is an adhesive that can be used for a long time. It is beneficial to improve the bonding strength between the laminate 120 and the purlin 110 and also beneficial to improve the durability and reliability of the photovoltaic system 10.

[0062] In some embodiments, please refer to FIG. 3 , the pressing block 130 further includes an upper pad 133 and a lower pad 134 located in the cavity Q, the upper pad 133 is clamped to the upper pressing block 131, and the lower pad 134 is clamped to the lower pressing block 132. The upper pad 133 and the lower pad 134 are connected along the first direction F 1 They are arranged opposite to each other and at intervals to form clamping positions for clamping the laminate 120 .

[0063] The laminate 120 can be first clamped between the upper pad 133 and the lower pad 134, and the upper pad 133, the laminate 120 and the lower pad 134 are clamped between the upper pressing block 131 and the lower pressing block 132, and then the adhesive layer 140 is filled in the gap j between the laminate 120 and the purlin 110, and the pressing block 130 is fixed on the purlin 110. In this way, the laminate 120 can be firmly fixed on the purlin 110, the frame can be omitted, the dust accumulation can be reduced, the design cost can be reduced, and the photoelectric conversion efficiency and power generation of the photovoltaic system 10 can be increased. In addition, the upper pad 133 and the lower pad 134 can be used to reduce the possibility of the laminate 120 being pinched, and the laminate 120 can be well protected.

[0064] In some embodiments, please refer to FIG4 , the upper pressing block 131 is provided with a first slot 1311 on one side facing the lower pressing block 132, and the lower pressing block 132 is provided with a second slot 1321 on one side facing the upper pressing block 131, and please refer to FIG3 , the upper pad 133 is provided with a first convex wing 1331 adapted to the first slot 1311 on one side facing away from the lower pad 134, and the lower pad 134 is provided with a second convex wing 1341 adapted to the second slot 1321 on one side facing away from the upper pad 133. The upper pad 133 is clamped to the upper pressing block 131 through the first convex wing 1331 and the first slot 1311, and the lower pad 134 is clamped to the lower pressing block 132 through the second convex wing 1341 and the second slot 1321.

[0065] In this way, the first convex wing 1331 and the first clamping groove 1311 can be used to clamp the side of the upper pad 133 away from the lower pad 134 to the upper pressure block 131, thereby improving the connection strength between the upper pad 133 and the upper pressure block 131. The second convex wing 1341 and the second clamping groove 1321 can also be used to clamp the side of the lower pad 134 away from the upper pad 133 to the lower pressure block 132, thereby improving the connection strength between the lower pad 134 and the lower pressure block 132. Furthermore, the pressure block 130 can be used to better clamp and fix the laminate 120, thereby improving the torsional resistance of the photovoltaic system 10.

[0066] In some embodiments, referring to FIG. 3 , the upper pad 133 has a pressing surface 1332 for pressing the laminate 120 , and the pressing surface 1332 is configured as a rough surface.

[0067] In this way, the upper pad 133 and the lower pad 134 can be used to protect the laminate 120, while also increasing the friction between the pressing surface 1332 and the laminate 120, which helps the laminate 120 to be more stably clamped between the upper pad 133 and the lower pad 134, thereby improving the torsional resistance of the photovoltaic system 10.

[0068] In other embodiments, the bottom pad 134 has a bearing surface 1342 for bearing the laminate 120 , and the bearing surface 1342 is configured as a rough surface.

[0069] In this way, the upper pad 133 and the lower pad 134 can be used to protect the laminate 120, while also increasing the friction between the bearing surface 1342 and the laminate 120, which helps the laminate 120 to be more stably clamped between the upper pad 133 and the lower pad 134, thereby improving the torsional resistance of the photovoltaic system 10.

[0070] In some other embodiments, the upper pad 133 has a pressing surface 1332 for pressing the laminate 120, and the lower pad 134 has a bearing surface 1342 for bearing the laminate 120, and both the pressing surface 1332 and the bearing surface 1342 are constructed as rough surfaces.

[0071] In this way, the upper pad 133 and the lower pad 134 can be used to protect the laminate 120, while also increasing the friction between the pressing surface 1332 and the laminate 120, and between the laminate 120 and the bearing surface 1342, which is beneficial for the laminate 120 to be more stably clamped between the upper pad 133 and the lower pad 134, thereby improving the torsional resistance of the photovoltaic system 10.

[0072] In some embodiments, the lower pressing block 132 is configured to extend along the extension direction of the purlin 110. Referring to FIG. 4 , the upper pressing block 131 includes a holding portion 1312 and a fixing portion 1313 staggered along the extension direction of the purlin 110, and a connecting portion 1314 connected between the holding portion 1312 and the fixing portion 1313. The fixing portion 1313 is disposed on the lower pressing block 132. The holding portion 1312 extends in the first direction F. 1 The upper and lower pressing blocks 132 are spaced apart to form a cavity Q.

[0073] Specifically, the first locking groove 1311 is disposed on a side of the pressing portion 1312 facing the lower pressing block 132 .

[0074] In this way, the fixing portion 1313 can be set on the lower pressing block 132, and the laminate 120 can be clamped in the cavity Q formed between the pressing portion 1312 and the lower pressing block 132, and the adhesive layer 140 can be used to improve the connection strength between the laminate 120 and the purlin 110, which can well fix the laminate 120, eliminate the frame, reduce dust accumulation, reduce design costs, and increase the photoelectric conversion efficiency and power generation of the photovoltaic system 10.

[0075] In some embodiments, the dimension of the pressing portion 1312 along the extension direction of the purlin 110 is 15 mm-20 mm.

[0076] If the dimension of the pressing portion 1312 along the extension direction of the purlin 110 is too small, the connection area between the pressing portion 1312 and the laminate 120 will be too small; if the dimension of the pressing portion 1312 along the extension direction of the purlin 110 is too small, it will cause excessive obstruction of the laminate 120; for this reason, it is necessary to set the dimension of the pressing portion 1312 along the extension direction of the purlin 110 within a suitable range, such as 15 mm-20 mm. In this way, the connection area between the pressing portion 1312 and the laminate 120 can be increased, thereby increasing the clamping force of the pressing block 130 on the laminate 120, and reducing the obstruction of the laminate 120, thereby improving the photoelectric conversion efficiency and power generation of the photovoltaic system 10.

[0077] In some embodiments, the photovoltaic system 10 further includes a fastener 150 , which passes through the upper pressing block 131 , the lower pressing block 132 and the purlin 110 to lock the laminate 120 to the purlin 110 .

[0078] Specifically, the fastener 150 passes through the fixing portion 1313 of the upper pressing block 131 , the lower pressing block 132 , and the purlin 110 .

[0079] Optionally, the fastener 150 may include a bolt 151 and a nut, and threaded holes matching the bolt 151 are respectively provided on the fixing portion 1313 and the lower pressing block 132, and a locking hole 111 is provided on the purlin 110. The bolt 151 passes through the threaded holes on the fixing portion 1313 and the lower pressing block 132, and passes through the locking hole 111, and is fixed by screw locking.

[0080] In this way, the upper pressing block 131 and the lower pressing block 132 can be fixed to the purlin 110 by using the fastener 150 , thereby improving the installation firmness of the photovoltaic system 10 , and further facilitating improving the torsion resistance of the photovoltaic system 10 .

[0081] In some embodiments, the purlin 110 is provided with at least one locking hole 111 , and the fastener 150 passes through the upper pressing block 131 , the lower pressing block 132 and the locking hole 111 to lock the laminate 120 to the purlin 110 , wherein the locking hole 111 is configured to extend longitudinally along the extension direction of the purlin 110 .

[0082] It can be understood that the locking hole 111 is configured as an oblong hole extending longitudinally along the extension direction of the purlin 110 .

[0083] In this way, the positions of the upper pressing block 131, the lower pressing block 132 and the laminate 120 clamped between the upper pressing block 131 and the lower pressing block 132 on the purlin 110 along the extension direction of the purlin 110 can be adjusted as needed, which can improve the installation convenience of the photovoltaic system 10 and meet the installation requirements of the photovoltaic system 10 in different situations.

[0084] Optionally, the purlin 110 is provided with a plurality of locking holes 111 arranged at intervals along the extension direction of the purlin 110 .

[0085] In this way, the upper pressing block 131, the lower pressing block 132 and the laminate 120 clamped between the upper pressing block 131 and the lower pressing block 132 can be fixed on the appropriate locking hole 111 as needed, and then the positions of the upper pressing block 131, the lower pressing block 132 and the laminate 120 clamped between the upper pressing block 131 and the lower pressing block 132 on the purlin 110 along the extension direction of the purlin 110 can be adjusted, which can improve the installation convenience of the photovoltaic system 10 and also meet the installation requirements of the photovoltaic system 10 in different situations.

[0086] In some embodiments, referring to FIG. 1 , the laminate 120 has a long side 121 and a short side 122 , the short side 122 of the laminate 120 is parallel to the extension direction of the purlin 110 , and each purlin 110 is provided with two pressing blocks 130 located on both sides of the short side direction of the corresponding laminate 120 .

[0087] The two pressing blocks 130 can be used to more firmly fix the laminate 120 to the purlin 110 , thereby better improving the torsion resistance of the photovoltaic system 10 .

[0088] The installation process of the photovoltaic system 10 of the present application is as follows:

[0089] The pressing block 130 on one side of the purlin 110 along the extension direction of the purlin 110 can be used to clamp and fix one side of the short side direction of the laminate 120, and the adhesive layer 140 can be filled in the gap j between the one side of the short side direction of the laminate 120 and the purlin 110. The pressing block 130 on the other side of the purlin 110 along the extension direction of the purlin 110 can be used to clamp and fix the other side of the short side direction of the laminate 120, and the adhesive layer 140 can be filled in the gap j between the other side of the short side direction of the laminate 120 and the purlin 110. In this way, the laminate 120 can be fixed to the purlin 110 more firmly, thereby better improving the torsion resistance of the photovoltaic system 10. In addition, the frame can be omitted to reduce the accumulation of dust at the raised part of the A surface due to the existence of the frame, reduce the design cost, increase the freedom of the installation point of the pressing block 130 relative to the laminate 120, and reduce the obstruction of the laminate 120 by the frame, thereby improving the utilization and absorption rate of sunlight by the photovoltaic system 10 and increasing the photoelectric conversion efficiency and power generation power of the photovoltaic system 10.

[0090] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0091] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A photovoltaic system, characterized in that: The photovoltaic system comprises: purlin; laminates; A pressing block is arranged on the purlin, the pressing block comprises an upper pressing block and a lower pressing block, the upper pressing block and the lower pressing block are arranged opposite to each other along a first direction to form a cavity for clamping the laminate; and An adhesive layer, wherein there is a gap between the laminate and the purlin, and the adhesive layer is filled in the gap; Wherein, the first direction is the thickness direction of the laminate.

2. The photovoltaic system according to claim 1, characterized in that: The bonding layer is organic silicon structural adhesive, acrylic structural adhesive, silicone structural adhesive, epoxy resin structural adhesive or polyurethane structural adhesive.

3. The photovoltaic system according to claim 1, characterized in that: The pressing block further comprises an upper pad and a lower pad located in the cavity, wherein the upper pad is clamped to the upper pressing block, and the lower pad is clamped to the lower pressing block; The upper pad and the lower pad are arranged opposite to each other and spaced apart along a first direction to form a clamping position for clamping the laminate.

4. The photovoltaic system according to claim 3, characterized in that: A first slot is provided on one side of the upper pressing block facing the lower pressing block, and a second slot is provided on one side of the lower pressing block facing the upper pressing block; A first convex wing adapted to the first slot is provided on a side of the upper pad strip away from the lower pad strip, and a second convex wing adapted to the second slot is provided on a side of the lower pad strip away from the upper pad strip; The upper pad is connected to the upper pressing block via the first convex wing and the first clamping groove, and the lower pad is connected to the lower pressing block via the second convex wing and the second clamping groove.

5. The photovoltaic system according to claim 4, characterized in that: The upper pad has a pressing surface for pressing on the laminate, and the lower pad has a bearing surface for bearing the laminate; The pressing surface is configured as a rough surface; and / or the bearing surface is configured as a rough surface.

6. The photovoltaic system according to claim 1, characterized in that: The lower pressing block is configured to extend along the extension direction of the purlin; The upper pressing block comprises a holding portion and a fixing portion staggered along the extending direction of the purlin, and a connecting portion connected between the holding portion and the fixing portion; The fixing portion is placed on the lower pressing block, and the holding portion is spaced apart from the lower pressing block in a first direction to form the cavity.

7. The photovoltaic system according to claim 6, characterized in that: The dimension of the pressing portion along the extension direction of the purlin is 15 mm to 20 mm.

8. The photovoltaic system according to any one of claims 1 to 7, characterized in that: The photovoltaic system further comprises a fastener; The fastener passes through the upper pressing block, the lower pressing block and the purlin to lock the laminate to the purlin.

9. The photovoltaic system according to claim 8, characterized in that: The purlin is provided with at least one locking hole; The fastener passes through the upper pressing block, the lower pressing block and the locking hole to lock the laminate to the purlin; Wherein, the locking hole is configured to extend longitudinally along the extension direction of the purlin.

10. The photovoltaic system according to claim 1, characterized in that: The laminate has long sides and short sides; The short sides of the laminate and the extending direction of the purlin are parallel to each other; Each purlin is provided with two pressing blocks located on both sides of the short side direction of the corresponding laminate.

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