Photovoltaic module

Abstract

The invention provides a photovoltaic module. The photovoltaic module comprises a bus bar, a buffer gasket, a glass back plate, a first adhesive film, a battery piece, a second adhesive film and a glass front plate, the glass backboard is provided with a first through hole. The buffer gasket is arranged between the glass back plate and the first adhesive film, a second through hole is formed in the buffer gasket, the second through hole is communicated with the first through hole, and the buffer gasket is connected to the part, close to the edge of the first through hole, of the glass back plate. One end of the bus bar is electrically connected with the battery piece, and at least part, far away from the battery piece, of the bus bar penetrates through the first through hole and the second through hole. In the application, when the area, supported by the buffer gasket at the first through hole, on the glass back plate is impacted by external force, the buffer gasket can absorb part of impact force on the first through hole, and the structural strength of the glass back plate at the first through hole can be improved through the support of the buffer gasket; therefore, the first through hole can be effectively prevented from cracking when being stressed.

Description

[0001] This application is a divisional application of the original application with the application number 202411050205.0 and the original filing date of August 01, 2024, and the entire contents of the original application are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of photovoltaic technology, in particular to a photovoltaic module. BACKGROUND

[0003] The photovoltaic module usually uses glass as the glass front plate and the glass back plate, such as a single-glass module or a double-glass module. However, due to the material properties of glass, it is easy to be broken by wind pressure, hail and other external forces, especially at the opening of the glass plate, which is relatively weak and has poor impact resistance, and is more likely to be damaged when subjected to external forces, thereby reducing the service life of the photovoltaic module. SUMMARY

[0004] The purpose of the present application is to provide a photovoltaic module to solve the problem of breaking at the opening of the glass plate in the photovoltaic module.

[0005] The present application provides a photovoltaic module, which comprises a busbar, a buffer gasket, and a glass back plate, a first adhesive film, a cell, a second adhesive film and a glass front plate which are stacked in sequence. The glass back plate is provided with a first through hole; The buffer gasket is arranged between the glass back plate and the first adhesive film, the buffer gasket is provided with a second through hole, the second through hole is in communication with the first through hole, and the buffer gasket is connected to a part of the glass back plate adjacent to the edge of the first through hole; One end of the busbar is electrically connected to the cell, and at least part of the busbar away from the cell is arranged in the first through hole and the second through hole.

[0006] In a possible implementation, one side end surface of the buffer gasket is connected to the glass back plate, and the first adhesive film covers the side surface of the buffer gasket and the end surface of the buffer gasket away from the glass back plate.

[0007] In a possible implementation, the first through hole and the second through hole are circular in shape, the inner diameter of the first through hole is d1, and the inner diameter of the second through hole is d2, wherein 0.8≤d2:d1≤1.13.

[0008] In a possible implementation, the inner diameter d2 of the second through hole is between 10mm and 13mm.

[0009] In a possible implementation, the buffer gasket is circular ring-shaped, elliptical ring-shaped or square ring-shaped.

[0010] In a possible implementation, the minimum distance between the outer side surface of the buffer gasket and the inner wall surface of the second through hole is between 1mm and 3mm.

[0011] In a possible implementation, the thickness of the buffer gasket is between 0.5mm and 1.5mm.

[0012] In a possible implementation, the buffer gasket is made of transparent flexible material; the material of the buffer gasket is silica gel, reinforced polycarbonate plastic rubber or glass fiber.

[0013] In a possible implementation, the corners of the glass back plate and / or the glass front plate are rounded corners.

[0014] In a possible implementation, the radius of the rounded corner is between 0.5mm and 1mm.

[0015] The technical scheme provided in the application can achieve the following beneficial effects: The photovoltaic module provided in the application can effectively avoid the cracking of the first through hole when the first through hole is subjected to an external force impact, because the buffer gasket can absorb part of the impact force on the first through hole and the support of the buffer gasket can improve the structural strength of the glass back plate at the first through hole.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A cross-sectional view of a photovoltaic module according to an embodiment of the application is provided. Figure 2 A cross-sectional view of a photovoltaic module according to another embodiment of the application is provided. Figure 3 A bottom view of a photovoltaic module according to an embodiment of the application is provided. Figure 4 A cross-sectional view of a photovoltaic module according to another embodiment of the application is provided. Figure 5 A cross-sectional view of a photovoltaic module according to another embodiment of the application is provided. Figure 6 A cross-sectional view of a photovoltaic module according to another embodiment of the application is provided. Figure 7 A partial cross-sectional view of a photovoltaic module according to an embodiment of the application is provided. Figure 8 A partial cross-sectional view of a photovoltaic module according to another embodiment of the present application is provided. Figure 9 A cross-sectional view of a photovoltaic module according to another embodiment of the present application is provided. Figure 10 A cross-sectional view of a photovoltaic module according to another embodiment of the present application is provided. Figure 11 A top view of a buffer gasket in a photovoltaic module according to an embodiment of the present application is provided. Figure 12 A side view of a buffer gasket according to an embodiment of the present application is provided. Figure 13 A top view of a backsheet in a photovoltaic module according to an embodiment of the present application is provided.

[0018] Reference Signs: 1 - glass backsheet; 11 - first through hole; 12 - corner; 2 - first adhesive film; 3 - cell; 4 - second adhesive film; 5 - glass front sheet; 6 - busbar; 7 - buffer gasket; 71 - second through hole; 8 - junction box.

[0019] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the present application. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0021] In the description of the present application, unless specifically defined and limited, the terms "first", "second" are only used for the purpose of description and should not be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" means two or more; the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can be detachable connection, or integral connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] In the description of the specification, it should be understood that the "upper", "lower" and other orientation words described in the embodiments of the application are described in the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the application. In addition, in the context, it should also be understood that when referring to one element connected to another element "on" or "under", it can be directly connected to another element "on" or "under" or indirectly connected to another element "on" or "under" through an intermediate element.

[0023] The photovoltaic module usually uses glass as the glass front plate and the glass back plate, such as a single-glass module or a double-glass module, but the glass is easily broken by wind pressure, hail and other external force impact due to its own material properties. In addition, holes are also provided on the glass for passing the busbar, which also makes the glass more fragile at the hole, has poor impact resistance, and is more easily damaged when subjected to external force, thereby reducing the service life of the photovoltaic module.

[0024] In view of this, Figure 1 A cross-sectional view of a photovoltaic module provided by an embodiment of the application is shown in Figure 1 As shown, the photovoltaic module provided by the embodiment of the application includes a busbar 6, a buffer gasket 7, and a glass back plate 1, a first adhesive film 2, a cell piece 3, a second adhesive film 4 and a glass front plate 5 which are sequentially stacked. The glass front plate 5 is located on the light side of the photovoltaic module and is used for transmitting sunlight. It can also be used to improve the waterproof and moisture-proof capability of the photovoltaic module, and together with the glass back plate 1 to seal the cell piece 3.

[0025] The cell piece 3 can be PERC, TOPCon, BC, heterojunction, perovskite, multi-busbar cell or busbar-free cell. The cell piece 3 can have multiple, and the multiple cell pieces 3 can be connected in series to form a cell string, and the cell string can also be provided with multiple.

[0026] The first adhesive film 2 is used to protect the light-receiving surface of the cell piece 3, and the light-receiving surface of the cell piece 3 is the side surface of the cell piece 3 facing the light source and used to receive direct sunlight.

[0027] The second adhesive film 4 is used to protect the back light surface of the cell piece 3, and the back light surface of the cell piece 3 is the side surface of the cell piece 3 away from the light source.

[0028] The material of the first adhesive film 2 and the second adhesive film 4 can be ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE) or EPE (EVA-POE-EVA co-extrusion) material.

[0029] During the lamination process of the photovoltaic module, the first adhesive film 2 and the second adhesive film 4 are used to encapsulate and protect the cell piece 3, prevent the external environment from affecting the performance of the cell piece 3, and also can bond the glass cover plate, the glass back plate 1 and the cell piece 3 into a whole.

[0030] Figure 2 A cross-sectional view of a photovoltaic module according to another embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the busbar 6 is a metal conductive strip, which can be made of silver, aluminum, copper or other materials. One end of the busbar 6 can be electrically connected to the electrode of the cell 3, which can collect and transmit the current on the cell 3 to the output of the photovoltaic module, realizing the conversion and output of electric energy. Figure 2

[0031] Figure 3 A bottom view of a photovoltaic module according to an embodiment of the present application (viewing the photovoltaic module from one side of the glass backboard 1) is shown in FIG. 4, which is also referred to FIG. 1 and FIG. 2. As shown in FIG. 4, the glass backboard 1 can be provided with a first through hole 11, and one end of the busbar 6 away from the cell 3 can be arranged in the first through hole 11 or pass through the first through hole 11. Figure 2 Figure 3 Figure 4 A cross-sectional view of a photovoltaic module according to another embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the busbar 6 is a metal conductive strip, which can be made of silver, aluminum, copper or other materials. One end of the busbar 6 can be electrically connected to the electrode of the cell 3, which can collect and transmit the current on the cell 3 to the output of the photovoltaic module, realizing the conversion and output of electric energy. Figure 4 Figure 3 Figure 4 Figure 3

[0032] Figure 5 A cross-sectional view of a photovoltaic module according to another embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the busbar 6 is a metal conductive strip, which can be made of silver, aluminum, copper or other materials. One end of the busbar 6 can be electrically connected to the electrode of the cell 3, which can collect and transmit the current on the cell 3 to the output of the photovoltaic module, realizing the conversion and output of electric energy. Figure 5 ​​​​​​​As shown, the buffer gasket 7 is arranged between the glass backboard 1 and the first adhesive film 2, and the second through hole 71 is arranged on the buffer gasket 7, the second through hole 71 is communicated with the first through hole 11, and the buffer gasket 7 is connected to the glass backboard 1 at a position adjacent to the edge of the first through hole 11. Wherein, the "position adjacent to the edge of the first through hole 11" can mean that the projection of the buffer gasket 7 in the thickness direction of the photovoltaic module can coincide with the edge of the first through hole 11, and can also mean that there is a small distance between the buffer gasket 7 and the edge of the first through hole 11. Figure 6 The photovoltaic module provided by another embodiment of the present application provides a cross-sectional view of the photovoltaic module, as shown in Figure 6 As shown, at least part of the bus bar 6 away from the cell 3 is arranged in the first through hole 11 and the second through hole 71, and can be electrically connected with the junction box 8.

[0033] Wherein, the buffer gasket 7 has a buffering function, when the photovoltaic module is impacted by external force, the buffer gasket 7 can absorb part of the impact force, so as to weaken the force transmission, and protect the glass front plate 5, the glass backboard 1 or the cell 3. Wherein, the area of the glass backboard 1 supported by the buffer gasket 7 at the first through hole 11 can absorb part of the impact force at the first through hole 11 when impacted by external force, and the support of the buffer gasket 7 can improve the structural strength of the glass backboard 1 at the first through hole 11, so as to effectively avoid the cracking of the first through hole 11 when stressed. In addition, due to the absorption of part of the impact force by the buffer gasket 7, the impact force transmitted to the cell 3 can be weakened, thereby achieving the protection of the cell 3.

[0034] In the forming process of the photovoltaic module, the layers constituting the photovoltaic module can be stacked in a predetermined order, that is, the glass front plate 5 can be placed at the bottom layer, and then the second adhesive film 4, the cell 3, the first adhesive film 2, the buffer gasket 7 and the glass backboard 1 can be sequentially stacked on the glass front plate 5 to form a laminated part. Wherein, when the cell 3 is stacked, the bus bar 6 connected to the cell 3 can be sequentially arranged through the second through hole 71 on the buffer gasket 7 and the first through hole 11 on the glass backboard 1 and then drawn out from above the glass backboard 1.

[0035] Then, the whole laminated part after stacking is put into a laminator for lamination, and the high temperature in the laminator can melt the first adhesive film 2 and the second adhesive film 4, the glass front plate 5 can be bonded with the cell 3 through the melted second adhesive film 4, the glass backboard 1 can be bonded with the cell 3 through the melted first adhesive film 2, and the bus bar 6 can be fixed, at the same time, the melted second adhesive film 4 can wrap the buffer gasket 7 through its own fluidity.

[0036] After lamination, the laminated part can be cooled to solidify the first adhesive film 2 and the second adhesive film 4 to form a stable structure photovoltaic module.

[0037] Thus, in the formed photovoltaic module, one side end surface of the buffer gasket 7 can be closely attached to the glass backboard 1, and the outer surface of the buffer gasket 7 not attached to the glass backboard 1 can be completely wrapped by the first adhesive film 2, so that reliable fixation of the buffer gasket 7 can be achieved through the first adhesive film 2, and meanwhile, no gap between the second adhesive film 4 and the buffer gasket 7 can be ensured, and the sealing performance is improved.

[0038] In the embodiment, the photovoltaic module can be a double-glass module, that is, the front plate and the back plate of the photovoltaic module are both made of glass material, and the light transmitted from the front plate to the cell sheet 3 and the light transmitted from the back plate to the cell sheet 3 can both be received by the cell sheet 3 and converted into electricity. If the buffer gasket 7 is made of lightproof material, part of the light will be blocked and cannot be transmitted to the cell sheet 3 through the buffer gasket 7, which will reduce the photoelectric conversion efficiency. Therefore, in the embodiment, the buffer gasket 7 can be made of transparent material, and for the double-glass module, part of the light can be transmitted to the cell sheet 3 through the glass backboard 1, the buffer gasket 7 and the first adhesive film 2 in sequence, so that high photoelectric conversion efficiency can be ensured.

[0039] In an embodiment, the material of the buffer gasket 7 can be silica gel, reinforced polycarbonate plastic rubber or glass fiber. These materials have high strength, good toughness, high temperature resistance and good light transmission, can reliably support the structure of the glass backboard 1 at the first through hole 11, and can achieve flexible buffering effect while ensuring the supporting strength, so as to prevent the glass backboard 1 near the first through hole 11 from being cracked when impacted. In addition, in other embodiments, the material of the buffer gasket 7 can also be other materials with the characteristics of light transmission, high strength, good toughness and high temperature resistance, which will not be described here.

[0040] In an embodiment, Figure 7 a partial cross-sectional view of the photovoltaic module provided in an embodiment of the present application is shown, Figure 7 exemplarily shows the fitting state of the glass backboard 1, the first adhesive film 2 and the buffer gasket before lamination. As shown in Figure 7 the thickness of the buffer gasket 7 is less than the thickness of the first adhesive film 2, and before lamination, the thickness of the first adhesive film 2 is much greater than that of the buffer gasket 7, most parts of the first adhesive film 2 can be overlapped on the glass backboard 1, and the parts of the first adhesive film 2 corresponding to the buffer gasket 7 can be overlapped on the buffer gasket 7 and can be lifted by the buffer gasket 7.

[0041] In an embodiment, the thickness of the buffer gasket 7 needs to meet certain size requirements in the case that the thickness of the buffer gasket 7 is less than the thickness of the first adhesive film 2. If the thickness of the buffer gasket 7 is too large, the thickness of the first adhesive film 2 between the buffer gasket 7 and the battery sheet 3 will be small, which makes it difficult to ensure the bonding effect between the buffer gasket 7 and the battery sheet 3. If the thickness of the buffer gasket 7 is too small, it is difficult to provide effective impact resistance and improve the impact resistance of the glass backboard 1 at the position near the first through hole 11.

[0042] To this end, in the present embodiment, as shown in Figure 7 The thickness H of the buffer gasket 7 can be between 0.5mm and 1.5mm. For example, the thickness H of the buffer gasket 7 can be 0.5mm, 0.8mm, 1.0mm, 1.3mm or 1.5mm. By making the thickness H of the buffer gasket 7 within the above thickness range, the buffer gasket 7 can provide effective support and buffering capacity, and improve the impact resistance of the glass backboard 1 at the position near the first through hole 11. At the same time, the buffer gasket 7 and the battery sheet 3 can have a first adhesive film 2 with sufficient thickness between them, which ensures the reliability of the bonding between the battery sheet 3 and the buffer gasket 7.

[0043] Figure 8 A partial cross-sectional view of a photovoltaic module provided for another embodiment of the present application is shown, Figure 8 For example, the cooperation state of the glass backboard 1, the first adhesive film 2 and the buffer gasket 7 after lamination is shown. As shown in Figure 8 During the lamination process, the molten first adhesive film 2 can cover the side of the buffer gasket 7 away from the glass backboard 1, so that the buffer gasket 7 and the battery sheet 3 can be bonded and fixed by the first adhesive film 2 located on the side of the buffer gasket 7 away from the glass backboard 1, which can ensure the reliability of the fixation of the buffer gasket 7 and the battery sheet 3. At the same time, the continuity of the first adhesive film 2 can be ensured, and the sealing effect of the battery sheet 3 can be improved by the first adhesive film 2. In addition, as mentioned above, as shown in Figure 8 The molten first adhesive film 2 can wrap the buffer gasket 7 as a whole between the first adhesive film 2 and the glass backboard 1, which will not be described here.

[0044] In an embodiment, it is to be noted that the second through hole 71 of the buffer gasket 7 can be smaller than, equal to, or larger than the inner diameter of the first through hole 11 of the glass backboard 1, but the inner diameter of the second through hole 71 and the inner diameter of the first through hole 11 need to satisfy a certain ratio range. If the second through hole 71 is too large or too small, it will have an adverse effect. For example, if the second through hole 71 is too large, it is difficult to strengthen the structure of the glass backboard 1 near the first through hole 11, it is difficult to absorb the impact force near the first through hole 11, and it is easy to cause the glass backboard 1 near the first through hole 11 to crack. If the second through hole 71 is too small, it will block the first through hole 11, making it difficult to ensure that the bus bar 6 can pass through reliably.

[0045] Therefore, in the embodiment, as shown in Figure 8 the first through hole 11 and the second through hole 71 can be circular, the inner diameter of the first through hole 11 is d1, and the inner diameter of the second through hole 71 is d2, where 0.8≤d2:d1≤1.13. When the ratio of d1 to d2 satisfies 0.8≤d2:d1<1, the inner diameter of the second through hole 71 is smaller than the inner diameter of the first through hole 11. When the ratio of d1 to d2 satisfies d2:d1=1, the inner diameter of the second through hole 71 is equal to the inner diameter of the first through hole 11. When the ratio of d1 to d2 satisfies 1

[0046] In an embodiment, the inner diameter of the second through hole 71 of the buffer gasket 7 needs to satisfy a certain size requirement. If the inner diameter of the second through hole 71 is too small, it is not convenient for the bus bar 6 to pass through. If the inner diameter of the second through hole 71 is too large, the distance between the inner wall of the second through hole 71 and the edge of the first through hole 11 is large, and the buffer gasket 7 cannot effectively support and buffer the edge of the first through hole 11, and the edge of the first through hole 11 is easy to crack when subjected to a large impact. In addition, if the inner diameter of the second through hole 71 is too large, in order to ensure the supporting and buffering effect of the gasket, the outer diameter of the buffer gasket 7 needs to be increased accordingly, which will increase the area of the buffer gasket 7 blocking the battery sheet 3, not only affecting the power generation efficiency of the photovoltaic module, but also easily increasing the stress on the battery sheet 3 during lamination, causing the battery sheet 3 to crack.

[0047] To this end, in the embodiment, the inner diameter d2 of the second through hole 71 can be between 10 mm and 13 mm. For example, the inner diameter d2 of the second through hole 71 can be 10 mm, 11 mm, 12 mm, or 13 mm. By making the inner diameter d2 of the second through hole 71 satisfy the above size range, the buffer gasket 7 can achieve effective support and buffering effect, and the impact resistance of the photovoltaic module can be improved. In addition, the inner diameter of the first through hole 11 can be between 11.5 mm and 12.5 mm. By making the inner diameter d2 of the second through hole 71 satisfy the above size range, the inner diameter of the second through hole 71 can be adapted to the inner diameter of the first through hole 11, so that better impact resistance can be achieved.

[0048] In an embodiment, Figure 9 The cross-sectional view of the photovoltaic module provided by another embodiment of the application is shown in Figure 9 As shown, the number of buffer gaskets 7 can be one. Figure 10 The cross-sectional view of the photovoltaic module provided by another embodiment of the application is shown in Figure 10 As shown, the number of buffer gaskets 7 can be more than two. The buffer gaskets 7 can be arranged at all the hole positions on the glass backboard 1, or the buffer gaskets 7 can be arranged at part of the hole positions. Specifically, the buffer gaskets 7 can be arranged at the hole positions where the impact resistance needs to be improved. The number of buffer gaskets 7 is not limited in the embodiment.

[0049] In an embodiment, Figure 11 The top view of the buffer gasket 7 in the photovoltaic module provided by the embodiment of the application is shown in Figure 11 In the embodiment, the shape of the buffer gasket 7 shown in Figure (a) is a circular ring, the shape of the buffer gasket 7 shown in Figure (b) is an elliptical ring, and the shape of the buffer gasket 7 shown in Figure (c) is a square ring. The shape of the buffer gasket 7 can be flexibly set. In other embodiments, the shape of the buffer gasket 7 can also be a polygon such as a rhombus, a trapezoid, a pentagon, a hexagon, etc. The shape of the buffer gasket 7 can be the same as or different from the shape of the first through hole 11 and the second through hole 71. The shape of the buffer gasket 7 can be determined according to factors such as support capacity and light shielding property.

[0050] In an embodiment, as shown in Figure 11As shown, the buffer gasket 7 can be annular, and the "annular" shape is formed by the material of the buffer gasket 7 and has a second through hole 71 in the middle. The "annular" shape is not limited to a circular ring, but also includes an elliptical ring, a square ring, etc. The minimum distance B between the outer side surface of the buffer gasket 7 and the inner wall surface of the second through hole 71 needs to meet certain size requirements. If the minimum distance B is too large, the buffer gasket 7 will have a large shielding area on the battery sheet 3, which will reduce the photoelectric conversion efficiency of the battery sheet 3. If the minimum distance B is too small, it is difficult for the buffer gasket 7 to provide reliable support and buffering capacity, and it is difficult to improve the impact resistance of the glass backboard 1 at the position of the first through hole 11.

[0051] To this end, in the embodiment, as shown in Figure 11 The minimum distance B between the outer side surface of the buffer gasket 7 and the inner wall surface of the second through hole 71 can be between 1mm and 3mm. For example, the minimum distance B can be 1mm, 2mm or 3mm. By making the minimum distance B between the outer side surface of the buffer gasket 7 and the inner wall surface of the second through hole 71 within the above size range, the buffer gasket 7 can provide reliable support and buffering capacity, thereby improving the impact resistance of the glass backboard 1 at the position of the first through hole 11.

[0052] In an embodiment, Figure 12 The side view of the buffer gasket 7 provided in the embodiment is shown in Figure 12 The shape of the buffer gasket 7 can be a circular ring. The outer diameter D of the buffer gasket 7 needs to meet certain size requirements and can be determined according to the inner diameter d2 of the second through hole 71 and the minimum distance B between the outer side surface of the buffer gasket 7 and the inner wall surface of the second through hole 71. For example, the outer diameter D of the buffer gasket 7 can be between 12mm and 19mm, thereby ensuring that the buffer gasket 7 provides reliable support and buffering capacity, and thereby improving the impact resistance of the glass backboard 1 at the position of the first through hole 11.

[0053] In an embodiment, Figure 13 The top view of the backboard of the photovoltaic module provided in the embodiment is shown in Figure 13 As shown, the corners 12 of the glass backboard 1 and / or the glass front board 5 are rounded. Taking the glass backboard 1 as an example, by setting the four corners of the glass backboard 1 to a rounded structure, compared to a sharp corner structure, the stress area of the four corners of the glass backboard 1 can be increased, which can reduce the risk of the glass backboard 1 breaking due to stress concentration when the glass backboard 1 is impacted by external forces, thereby improving the structural strength of the glass backboard 1. Not only can it reduce the loss of the glass backboard 1 during transportation and assembly, but it can also improve the overall impact resistance of the photovoltaic module and reduce the risk of the glass backboard 1 breaking, which is conducive to prolonging the service life of the photovoltaic module.

[0054] In an embodiment, the radius of the rounded corner of the glass back sheet 1 and / or the glass front sheet 5 needs to meet certain size requirements. Taking the glass back sheet 1 as an example, if the radius of the rounded corner is too large, the overall area of the glass back sheet 1 will be small, which will result in a decrease in photoelectric conversion efficiency. If the radius of the rounded corner is too small, there will still be a large stress concentration at the corner 12 of the glass back sheet 1, which is prone to cause the corner 12 to break after being impacted.

[0055] To this end, in the present embodiment, the radius of the rounded corner can be between 0.5 mm and 1 mm. For example, the radius of the rounded corner can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm. By making the radius of the rounded corner meet the above size range, the photoelectric conversion efficiency can be ensured to be high, and the stress at the corner 12 can be reduced, the reliability of the photovoltaic module can be improved, and the service life can be prolonged.

[0056] In addition, the size of the rounded corner of the glass front sheet 5 and the glass back sheet 1 can be consistent, so that the photovoltaic module can be conveniently framed.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module, characterized in that, It includes a busbar (6), a buffer pad (7), and a glass back plate (1), a first film (2), a battery cell (3), a second film (4), and a glass front plate (5) stacked in sequence. The glass back plate (1) is provided with a first through hole (11); The buffer pad (7) is disposed between the glass back plate (1) and the first adhesive film (2). The outer surface of the buffer pad (7) that is not in contact with the glass back plate (1) is covered by the first adhesive film (2). The buffer pad (7) is provided with a second through hole (71), which communicates with the first through hole (11). The buffer pad (7) is connected to the part of the glass back plate (1) adjacent to the edge of the first through hole (11). One end of the busbar (6) is electrically connected to the battery cell (3), and at least a portion of the busbar (6) away from the battery cell (3) passes through the first through hole (11) and the second through hole (71).

2. The photovoltaic module according to claim 1, characterized in that, One end face of the buffer pad (7) is connected to the glass back plate (1), and the first adhesive film (2) covers the side of the buffer pad (7) and the end face of the buffer pad (7) facing away from the glass back plate (1).

3. The photovoltaic module according to claim 1, characterized in that, The first through hole (11) and the second through hole (71) are circular in shape. The inner diameter of the first through hole (11) is d1 and the inner diameter of the second through hole (71) is d2, wherein 0.8≤d2:d1≤1.

13.

4. The photovoltaic module according to claim 3, characterized in that, The inner diameter d2 of the second through hole (71) is between 10mm and 13mm.

5. The photovoltaic module according to any one of claims 1-4, characterized in that, The shape of the buffer pad (7) is circular, elliptical, or square.

6. The photovoltaic module according to any one of claims 1-4, characterized in that, The minimum distance between the outer surface of the buffer pad (7) and the inner wall of the second through hole (71) is between 1 mm and 3 mm.

7. The photovoltaic module according to any one of claims 1-4, characterized in that, The thickness of the buffer pad (7) is between 0.5 mm and 1.5 mm.

8. The photovoltaic module according to any one of claims 1-4, characterized in that, The buffer pad (7) is made of a transparent and flexible material; The material of the buffer pad (7) is silicone, reinforced polycarbonate plastic rubber or glass fiber.

9. The photovoltaic module according to any one of claims 1-4, characterized in that, The corners (12) of the glass back panel (1) and / or the glass front panel (5) are rounded.

10. The photovoltaic module according to claim 9, characterized in that, The radius of the fillet is between 0.5mm and 1mm.

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