photovoltaic modules

Abstract

This application provides a photovoltaic module, comprising a busbar, a buffer pad, and a glass backsheet, a first encapsulating film, a solar cell, a second encapsulating film, and a glass front sheet stacked sequentially. A first through-hole is provided on the glass backsheet. The buffer pad is disposed between the glass backsheet and the first encapsulating film, and has a second through-hole communicating with the first through-hole. The buffer pad is connected to a portion of the glass backsheet adjacent to the edge of the first through-hole. One end of the busbar is electrically connected to the solar cell, and at least a portion of the busbar away from the solar cell passes through the first and second through-holes. In this application, when the area of ​​the glass backsheet supported by the buffer pad at the first through-hole is subjected to an external impact, the buffer pad can absorb part of the impact force on the first through-hole, and the support of the buffer pad can improve the structural strength of the glass backsheet at the first through-hole, thereby effectively preventing cracking at the first through-hole under stress.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and more particularly to a photovoltaic module. Background Technology

[0002] Photovoltaic modules typically use glass as the front and back glass panels, such as single-glass or double-glass modules. However, due to the inherent properties of glass, it is easily broken by external forces such as wind pressure and hail. It is particularly vulnerable at the openings in the glass, with poor impact resistance, making it more susceptible to damage when subjected to external forces, thus reducing the lifespan of the photovoltaic modules. Summary of the Invention

[0003] The purpose of this application is to provide a photovoltaic module to solve the problem of glass plate cracking due to impact at the opening.

[0004] This application provides a photovoltaic module, which includes a busbar, a buffer pad, and a glass back sheet, a first encapsulating film, a solar cell, a second encapsulating film, and a glass front sheet stacked in sequence.

[0005] A first through hole is provided on the glass back plate;

[0006] The buffer pad is disposed between the glass back plate and the first adhesive film. The buffer pad is provided with a second through hole, which communicates with the first through hole. The buffer pad is connected to the glass back plate at a position adjacent to the edge of the first through hole.

[0007] One end of the busbar is electrically connected to the battery cell, and at least a portion of the busbar away from the battery cell passes through the first through hole and the second through hole.

[0008] In one possible implementation, one end face of the buffer pad is connected to the glass back plate, and the first adhesive film covers the side of the buffer pad and the end face of the buffer pad facing away from the glass back plate.

[0009] In one possible implementation, the first through hole and the second through hole are circular in shape, with the inner diameter of the first through hole being d1 and the inner diameter of the second through hole being d2, wherein 0.8 ≤ d2:d1 ≤ 1.13.

[0010] In one possible implementation, the inner diameter d2 of the second through hole is between 10 mm and 13 mm.

[0011] In one possible implementation, the buffer pad is in the shape of a circular ring, an elliptical ring, or a square ring.

[0012] In one possible implementation, the minimum distance between the outer surface of the buffer pad and the inner wall of the second through hole is between 1 mm and 3 mm.

[0013] In one possible implementation, the thickness of the buffer pad is between 0.5 mm and 1.5 mm.

[0014] In one possible implementation, the cushioning pad is a transparent, flexible material; the material of the cushioning pad is silicone, reinforced polycarbonate plastic rubber, or glass fiber.

[0015] In one possible implementation, the corners of the glass back panel and / or the glass front panel are rounded.

[0016] In one possible implementation, the radius of the fillet is between 0.5 mm and 1 mm.

[0017] The technical solution provided in this application can achieve the following beneficial effects:

[0018] The photovoltaic module provided in this application has a buffer pad on the glass backsheet. When the area supported by the buffer pad at the first through-hole is subjected to an external impact, the buffer pad can absorb part of the impact force on the first through-hole. Furthermore, the support provided by the buffer pad increases the structural strength of the glass backsheet at the first through-hole, effectively preventing cracking at the first through-hole under stress. In addition, because the buffer pad absorbs part of the impact force, it reduces the impact force transmitted to the solar cells, thereby protecting the solar cells.

[0019] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0020] Figure 1 A cross-sectional view of a photovoltaic module provided in one embodiment of this application;

[0021] Figure 2 A cross-sectional view of a photovoltaic module provided in another embodiment of this application;

[0022] Figure 3 This is a bottom view of a photovoltaic module provided in one embodiment of this application;

[0023] Figure 4 A cross-sectional view of a photovoltaic module provided in another embodiment of this application;

[0024] Figure 5 A cross-sectional view of a photovoltaic module provided in another embodiment of this application;

[0025] Figure 6 A cross-sectional view of a photovoltaic module provided in another embodiment of this application;

[0026] Figure 7 This is a partial cross-sectional view of a photovoltaic module provided in one embodiment of this application;

[0027] Figure 8 A partial cross-sectional view of a photovoltaic module provided in another embodiment of this application;

[0028] Figure 9 A cross-sectional view of a photovoltaic module provided in another embodiment of this application;

[0029] Figure 10 A cross-sectional view of a photovoltaic module provided in another embodiment of this application;

[0030] Figure 11 This is a top view of the buffer pad in the photovoltaic module provided in the embodiments of this application;

[0031] Figure 12 A side view of the buffer pad provided in an embodiment of this application;

[0032] Figure 13 This is a top view of the backsheet in a photovoltaic module provided in an embodiment of this application.

[0033] Figure label:

[0034] 1-Glass back panel;

[0035] 11-First through hole;

[0036] 12-Corner;

[0037] 2-First adhesive film;

[0038] 3-Battery cells;

[0039] 4-Second adhesive film;

[0040] 5-Glass front panel;

[0041] 6-Busbar;

[0042] 7-Buffer pads;

[0043] 71 - Second through hole;

[0044] 8- Junction box.

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0047] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" used in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0049] Photovoltaic modules typically use glass as both the front and back panels, such as single-glass or double-glass modules. However, due to its inherent material properties, glass is easily broken by external impacts such as wind pressure and hail. Furthermore, holes are often cut into the glass for busbars to pass through, making the glass more vulnerable at these openings, reducing its impact resistance and making it more susceptible to damage from external forces, thus shortening the lifespan of the photovoltaic modules.

[0050] In view of this, Figure 1 This is a cross-sectional view of a photovoltaic module provided in one embodiment of this application, as shown below. Figure 1 As shown in the figure, this application provides a photovoltaic module, which includes a busbar 6, a buffer pad 7, and a glass backplate 1, a first encapsulating film 2, a solar cell 3, a second encapsulating film 4, and a glass front plate 5 stacked in sequence. The glass front plate 5 is located on the light-facing side of the photovoltaic module, used to transmit sunlight, and can also be used to improve the waterproof and moisture-proof capabilities of the photovoltaic module, sealing the solar cell 3 together with the glass backplate 1.

[0051] The solar cell 3 can be a PERC, TOPCon, BC, heterojunction, perovskite, multi-busbar, or busbarless solar cell. Multiple solar cells 3 can be connected in series to form a solar string, and multiple solar strings can also be configured.

[0052] The first film 2 is used to protect the light-facing surface of the solar cell 3, which is the side of the solar cell 3 facing the light source and used to receive direct sunlight.

[0053] The second adhesive film 4 is used to protect the back surface of the battery cell 3, which is the side of the battery cell 3 that faces away from the light source.

[0054] The materials of the first adhesive film 2 and the second adhesive film 4 can be ethylene-ethylene acetate copolymer (EVA), polyolefin elastomer (POE) or EPE (EVA-POE-EVA co-extrusion) material.

[0055] During the lamination process of photovoltaic modules, the first encapsulant film 2 and the second encapsulant film 4 are used to encapsulate and protect the solar cell 3, preventing the external environment from affecting the performance of the solar cell 3. At the same time, they can also bond the glass cover, the glass backplate 1 and the solar cell 3 into a whole.

[0056] Figure 2 A cross-sectional view of a photovoltaic module provided in another embodiment of this application, as shown below. Figure 2 As shown, the busbar 6 is a metallic conductive strip, which can be made of materials such as silver, aluminum, or copper. One end of the busbar 6 can be electrically connected to the electrode of the solar cell 3, enabling it to collect the current from the solar cell 3 and transmit it to the output end of the photovoltaic module, thereby realizing the conversion and output of electrical energy.

[0057] Figure 3 A bottom view of a photovoltaic module provided in one embodiment of this application (viewed from one side of the glass backplate 1), while referring to... Figure 2 and Figure 3 A first through hole 11 may be provided on the glass back plate 1. The end of the busbar 6 away from the battery cell 3 may be inserted into the first through hole 11 or pass out from the first through hole 11. Figure 4 A cross-sectional view of a photovoltaic module provided in another embodiment of this application, as shown below. Figure 4 As shown, the end of the busbar 6 furthest from the solar cell 3 can be electrically connected to the junction box 8. The junction box 8 can be used to connect the power generated by the photovoltaic module to an external line and conduct the current generated by the photovoltaic module. The junction box 8 can be installed on the glass backplate 1. Wherein, as... Figure 3 As shown, a photovoltaic module can have length and width. For ease of explanation, we can define a photovoltaic module as having a length direction X and a width direction Y, and a thickness direction Z (e.g., ...). Figure 4(As shown) is a direction that is perpendicular to both the length direction X and the width direction Y. Multiple busbars 6 can be provided, and they can be located at the edges of the photovoltaic module. For example, the busbars 6 can be distributed at both ends of the photovoltaic module along the length direction X. Correspondingly, multiple first through holes 11 can also be provided on the glass backplate 1, and each first through hole 11 can allow one or more busbars 6 to pass through. For example, as... Figure 3 As shown, three first through holes 11 can be provided in the middle of the glass back plate 1. These three first through holes 11 can enable the lead-out of each busbar 6 in the photovoltaic module provided in this embodiment. The specific number and distribution of the first through holes 11 can be adaptively set according to the number and position distribution of the busbars 6 in the photovoltaic module. This embodiment does not impose any restrictions on this.

[0058] Figure 5 A cross-sectional view of a photovoltaic module provided in another embodiment of this application, as shown below. Figure 5 As shown, a buffer pad 7 is disposed between the glass backplate 1 and the first adhesive film 2. The buffer pad 7 has a second through hole 71, which communicates with the first through hole 11. The buffer pad 7 is connected to a portion of the glass backplate 1 adjacent to the edge of the first through hole 11. The phrase "adjacent to the edge of the first through hole 11" can mean that the projection of the buffer pad 7 in the thickness direction of the photovoltaic module coincides with the edge of the first through hole 11, or it can mean that there is a small distance between the buffer pad 7 and the edge of the first through hole 11. Figure 6 Another embodiment of this application provides a cross-sectional view of a photovoltaic module, such as... Figure 6 As shown, 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, and is electrically connected to the junction box 8.

[0059] The buffer pad 7 has a cushioning function. When the photovoltaic module is impacted by external forces, the buffer pad 7 can absorb part of the impact force, thereby reducing the force transmission and protecting the front glass panel 5, the back glass panel 1, or the solar cells 3. Specifically, the area on the back glass panel 1 supported by the buffer pad 7 at the first through-hole 11 can absorb part of the impact force on the first through-hole 11 when subjected to external forces. Furthermore, the support provided by the buffer pad 7 can enhance the structural strength of the back glass panel 1 at the first through-hole 11, effectively preventing cracking at the first through-hole 11 under stress. In addition, because the buffer pad 7 absorbs part of the impact force, it can reduce the impact force transmitted to the solar cells 3, thereby protecting the solar cells 3.

[0060] In the photovoltaic module forming process, the layers constituting the photovoltaic module can be stacked in a predetermined order. That is, the glass front panel 5 can be placed at the bottom, and then the second encapsulating film 4, the solar cell 3, the first encapsulating film 2, the buffer pad 7, and the glass back panel 1 can be stacked sequentially on the glass front panel 5 to form a laminate. Among them, when stacking the solar cells 3, the busbar 6 connected to the solar cells 3 can be passed through the second through hole 71 on the buffer pad 7 and the first through hole 11 on the glass back panel 1 and then led out from the top of the glass back panel 1.

[0061] Then, the stacked laminate is placed into a laminator for lamination. The high temperature in the laminator can melt the first adhesive film 2 and the second adhesive film 4. The glass front panel 5 can be bonded to the battery cell 3 through the molten second adhesive film 4. The glass back panel 1 can be bonded to the battery cell 3 through the molten first adhesive film 2 and can fix the busbar 6. At the same time, the molten second adhesive film 4 can wrap the buffer pad 7 through its own fluidity.

[0062] After lamination, the laminated components can be cooled to cure the first adhesive film 2 and the second adhesive film 4, thereby forming a structurally stable photovoltaic module.

[0063] Therefore, in the formed photovoltaic module, one side of the buffer pad 7 can be tightly attached to the glass backing plate 1, and the outer surface of the buffer pad 7 that is not attached to the glass backing plate 1 can be completely wrapped by the first adhesive film 2. Thus, the buffer pad 7 can be reliably fixed by the first adhesive film 2, while ensuring that there is no gap between the second adhesive film 4 and the buffer pad 7, thereby improving the sealing performance.

[0064] In this embodiment, the photovoltaic module can be a double-glass module, meaning both the front and back panels are made of glass. Light transmitted from the front panel to the solar cell 3 and light transmitted from the back panel to the solar cell 3 can both be received and converted into photoelectric value by the solar cell 3. If the buffer pad 7 is made of an opaque material, it will block some light from passing through and reaching the solar cell 3, reducing the photoelectric conversion efficiency. Therefore, in this embodiment, the buffer pad 7 can be made of a transparent material. For the double-glass module, some light can pass through the glass back panel 1, the buffer pad 7, and the first encapsulating film 2 sequentially before reaching the solar cell 3, thus ensuring high photoelectric conversion efficiency.

[0065] In one embodiment, the buffer pad 7 can be made of silicone, reinforced polycarbonate rubber, or fiberglass. These materials have high strength, good toughness, high temperature resistance, and good light transmittance, which can reliably support the structure of the glass back plate 1 at the first through hole 11, and while ensuring support strength, they can also achieve a flexible buffering effect, preventing the glass back plate 1 near the first through hole 11 from cracking upon impact. Furthermore, in other embodiments, the buffer pad 7 can also be made of other light-transmitting materials with high strength, good toughness, and high temperature resistance, which will not be elaborated further here.

[0066] In one embodiment, Figure 7 This is a partial cross-sectional view of a photovoltaic module provided in one embodiment of this application. Figure 7 The example illustrates the mating state of the glass backing plate 1, the first adhesive film 2, and the buffer tube gasket before lamination. Figure 7 As shown, the thickness of the buffer pad 7 is less than the thickness of the first adhesive film 2. Before lamination, the first adhesive film 2 has a much greater thickness than the buffer pad 7. Most of the first adhesive film 2 can overlap the glass backing plate 1, and the part of the first adhesive film 2 corresponding to the buffer pad 7 can overlap the buffer pad 7 and be lifted up by the buffer pad 7.

[0067] In one embodiment, even if the thickness of the buffer pad 7 is less than the thickness of the first adhesive film 2, it still needs to meet certain dimensional requirements. If the thickness of the buffer pad 7 is too large, the thickness of the first adhesive film 2 between the buffer pad 7 and the battery cell 3 will be too small, making it difficult to ensure the bonding effect between the buffer pad 7 and the battery cell 3. If the thickness of the buffer pad 7 is too small, it will be difficult to provide effective impact resistance and improve the impact resistance of the glass back plate 1 near the first through hole 11.

[0068] Therefore, in this embodiment, as Figure 7 As shown, the thickness H of the buffer pad 7 can be between 0.5mm and 1.5mm. For example, the thickness H of the buffer pad 7 can be 0.5mm, 0.8mm, 1.0mm, 1.3mm, or 1.5mm. By ensuring that the thickness H of the buffer pad 7 is within the above-mentioned thickness range, the buffer pad 7 can provide effective support and cushioning capacity, improve the impact resistance of the glass back plate 1 near the first through hole 11, and at the same time ensure that there is a sufficiently thick first adhesive film 2 between the buffer pad 7 and the battery cell 3, ensuring the reliability of the bonding between the battery cell 3 and the buffer pad 7.

[0069] Figure 8 A partial cross-sectional view of a photovoltaic module provided in another embodiment of this application. Figure 8 An exemplary illustration shows the mating state of the glass backing plate 1, the first adhesive film 2, and the cushioning pad 7 after lamination. For example... Figure 8As shown, during the lamination process, the molten first adhesive film 2 can cover the side of the buffer pad 7 facing away from the glass backplate 1. This allows the buffer pad 7 and the battery cell 3 to be bonded and fixed together using the first adhesive film 2 on the side of the buffer pad 7 facing away from the glass backplate 1. This ensures the reliability of the fixation between the buffer pad 7 and the battery cell 3, while also maintaining the continuity of the first adhesive film 2, thereby improving the sealing effect on the battery cell 3. Furthermore, as explained above, if... Figure 8 As shown, the molten first adhesive film 2 can completely cover the buffer pad 7 between the first adhesive film 2 and the glass back plate 1, which will not be described in detail here.

[0070] In one embodiment, it should be noted that the second through-hole 71 of the buffer pad 7 can be smaller than, equal to, or larger than the inner diameter of the first through-hole 11 of the glass back plate 1. However, the inner diameter of the second through-hole 71 and the inner diameter of the first through-hole 11 need to meet a certain proportional range. If the second through-hole 71 is too large or too small, it will have adverse effects. For example, if the second through-hole 71 is too large, it will be difficult to strengthen the structure of the glass back plate 1 near the first through-hole 11, and it will be difficult to absorb the impact force near the first through-hole 11, easily causing cracks in the glass back plate 1 near the first through-hole 11. Conversely, if the second through-hole 71 is too small, it will obstruct the first through-hole 11, making it difficult to ensure the reliable passage of the busbar 6.

[0071] Therefore, in this embodiment, as Figure 8 As shown, the first through hole 11 and the second through hole 71 can be 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, 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 < d2:d1 ≤ 1.13, the inner diameter of the second through hole 71 is larger than the inner diameter of the first through hole 11. Therefore, within the aforementioned ratio range, when the inner diameter of the second through hole 71 is less than, equal to, or greater than the inner diameter of the first through hole 11, it can effectively support the glass back plate 1 near the first through hole 11. This ensures the structural strength of the glass back plate 1 near the first through hole 11 while also providing a buffering effect to prevent cracking or shattering of the glass back plate 1 near the first through hole 11 when subjected to impact. For example, the ratio of d2:d1 can be 0.8, 0.9, 1.0, 1.1, or 1.13.

[0072] In one embodiment, the inner diameter of the second through hole 71 of the buffer pad 7 needs to meet certain dimensional requirements. If the inner diameter of the second through hole 71 is too small, it will be difficult for the busbar 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 will be large, making it difficult for the buffer pad 7 to effectively support and buffer the edge of the first through hole 11. The edge of the first through hole 11 is prone to breakage 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 support and buffering effect of the pad, the outer diameter of the buffer pad 7 needs to be increased accordingly. This will increase the area of ​​the buffer pad 7 that blocks the solar cell 3, which will not only affect the power generation efficiency of the photovoltaic module, but also easily increase the stress on the solar cell 3 during lamination and cause the solar cell 3 to break.

[0073] Therefore, in this embodiment, the inner diameter d2 of the second through hole 71 can be between 10mm and 13mm. For example, the inner diameter d2 of the second through hole 71 can be 10mm, 11mm, 12mm, or 13mm. By ensuring that the inner diameter d2 of the second through hole 71 meets the above-mentioned size range, the buffer pad 7 can achieve effective support and buffering effects, thereby improving the impact resistance of the photovoltaic module. In addition, the inner diameter of the first through hole 11 can be between 11.5mm and 12.5mm. By ensuring that the inner diameter d2 of the second through hole 71 meets the above-mentioned size range, the inner diameter of the second through hole 71 can also be adapted to the inner diameter of the first through hole 11, thereby achieving a better impact resistance effect.

[0074] In one embodiment, Figure 9 Another embodiment of this application provides a cross-sectional view of a photovoltaic module, such as... Figure 9 As shown, the number of buffer pads 7 can be set to one. Figure 10 Another embodiment of this application provides a cross-sectional view of a photovoltaic module, such as... Figure 10 As shown, the number of buffer pads 7 can be more than two. Buffer pads 7 can be installed at all opening positions on the glass back plate 1, or at some opening positions. Specifically, buffer pads 7 can be installed at opening positions where impact resistance needs to be strengthened. This embodiment does not limit the number of buffer pads 7.

[0075] In one embodiment, Figure 11 This is a top view of the buffer pad 7 in the photovoltaic module provided in the embodiments of this application. Figure 11In Figure (a), the buffer pad 7 is circular; in Figure (b), it is elliptical; and in Figure (c), it is square. The shape of the buffer pad 7 can be flexibly configured. In other embodiments, the buffer pad 7 can also be a polygon such as a rhombus, trapezoid, pentagon, or hexagon. The shape of the buffer pad 7 can be the same as or different from the shape of the first through hole 11 and the second through hole 71. The specific shape of the buffer pad 7 can be determined by considering factors such as support capacity and light-blocking properties.

[0076] In one embodiment, such as Figure 11 As shown, the buffer pad 7 can be annular. This "annular" shape is formed by the material of the buffer pad 7 surrounding the pad and has a second through hole 71 in the middle. This "annular" shape is not limited to circular annular shapes, but also includes elliptical annular shapes, square annular shapes, etc. The minimum distance B between the outer surface of the buffer pad 7 and the inner wall surface of the second through hole 71 needs to meet certain dimensional requirements. If this minimum distance B is too large, the buffer pad 7 will have a large blocking area on the solar cell 3, which will reduce the photoelectric conversion efficiency of the solar cell 3. If this minimum distance B is too small, it will be difficult for the buffer pad 7 to provide reliable support and cushioning capacity, and it will be difficult to improve the impact resistance of the glass back plate 1 at the position of the first through hole 11.

[0077] Therefore, in this embodiment, as Figure 11 As shown, the minimum distance B between the outer surface of the buffer pad 7 and the inner wall of the second through hole 71 can be between 1 mm and 3 mm. For example, the minimum distance B can be 1 mm, 2 mm, or 3 mm. By ensuring that the minimum distance B between the outer surface of the buffer pad 7 and the inner wall of the second through hole 71 is within the above-mentioned size range, the buffer pad 7 can be guaranteed to provide reliable support and cushioning capacity, thereby improving the impact resistance of the glass back plate 1 at the location of the first through hole 11.

[0078] In one embodiment, Figure 12 A side view of the buffer pad 7 provided in the embodiments of this application, as shown. Figure 12 As shown, the shape of the buffer pad 7 can be annular. The outer diameter D of the buffer pad 7 needs to meet certain dimensional requirements. The outer diameter D can be determined based on the inner diameter d2 of the aforementioned second through hole 71 and the minimum distance B between the outer side surface of the buffer pad 7 and the inner wall surface of the second through hole 71. For example, the outer diameter D of the buffer pad 7 can be between 12mm and 19mm, thereby ensuring that the buffer pad 7 provides reliable support and buffering capacity, and thus improving the impact resistance of the glass back plate 1 at the position of the first through hole 11.

[0079] In one embodiment, Figure 13 This is a top view of the backsheet in the photovoltaic module provided in the embodiments of this application, as shown below. Figure 13 As shown, the corners 12 of the glass back panel 1 and / or the glass front panel 5 are rounded. Taking the glass back panel 1 as an example, by setting the four corners of the glass back panel 1 to a rounded structure, compared with a sharp corner structure, the stress-bearing area of ​​the four corners of the glass back panel 1 can be increased. This reduces the risk of the glass back panel 1 cracking due to stress concentration when subjected to external impact, thereby improving the structural strength of the glass back panel 1. This not only reduces the loss of the glass back panel 1 during transportation and assembly, but also improves the overall impact resistance of the photovoltaic module, reduces the risk of the glass back panel 1 breaking, and helps to extend the service life of the photovoltaic module.

[0080] In one embodiment, the radius of the rounded corners of the glass back panel 1 and / or the glass front panel 5 needs to meet certain dimensional requirements. Taking the glass back panel 1 as an example, if the radius of the rounded corners is too large, the overall area of ​​the glass back panel 1 will be small, resulting in a decrease in photoelectric conversion efficiency. If the radius of the rounded corners is too small, there will still be a large stress concentration at the corner 12 of the glass back panel 1, which is prone to breakage after being subjected to impact.

[0081] Therefore, in this embodiment, the radius of the rounded corner can be between 0.5mm and 1mm. For example, the radius of the rounded corner can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. By ensuring that the radius of the rounded corner meets the above-mentioned size range, high photoelectric conversion efficiency can be guaranteed while reducing the stress at the corner 12, improving the reliability of the photovoltaic module, and extending its service life.

[0082] In addition, the rounded corners of the glass front panel 5 and the glass back panel 1 can be the same, which makes it easier to frame the photovoltaic modules.

[0083] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this 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 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); 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.

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 inner diameter d2 of the second through hole (71) is between 10mm and 13mm.

4. The photovoltaic module according to any one of claims 1-3, characterized in that, The shape of the buffer pad (7) is circular, elliptical, or square.

5. The photovoltaic module according to any one of claims 1-3, 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.

6. The photovoltaic module according to any one of claims 1-3, characterized in that, The thickness of the buffer pad (7) is between 0.5mm and 1.5mm.

7. The photovoltaic module according to any one of claims 1-3, 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.

8. The photovoltaic module according to any one of claims 1-3, characterized in that, The corners (12) of the glass back panel (1) and / or the glass front panel (5) are rounded.

9. The photovoltaic module according to claim 8, characterized in that, The radius of the fillet is between 0.5mm and 1mm.

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