Backsheet glass and photovoltaic module

Abstract

The utility model discloses a back glass and photovoltaic module, be applied to photovoltaic technical field. The back glass of the utility model is provided with at least one lead-out line hole, the lead-out line hole is used for wearing at least one lead-out line, the lead-out line includes at least two, the lead-out line hole includes the lead-out line hole of the shape of the upper narrow lower wide that is constituted by the different length straight line section and the different curvature radius curve section. The utility model can reduce the aperture area of back glass, thereby reduces the defect of back glass, improves photovoltaic module load performance, and further improves photovoltaic module safety while realizing the lead-out of multiple lead-out lines from the lead-out line hole of back glass, on one hand, on the other hand can reduce the risk of lap joint short circuit, thereby improve photovoltaic module power generation power, in addition, because of adopting single curve of different curvature radius, can also be compatible with existing glass production process and glass edge grinding process, thereby reduce the defect probability of the shape lead-out line hole due to aperture burr.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a back glass and a photovoltaic module. Background Technology

[0002] As photovoltaic (PV) module power gradually increases, cell sizes are also growing. To maintain compatibility with existing cell design and layout technologies, module sizes are also expanding, creating difficulties in module design, manufacturing, transportation, and installation. Existing multi-segmentation technology reduces cell current and power loss and increases module power by repeatedly dicing large-size cells. However, quarter-segmentation, due to its different layout compared to conventional layouts, results in various lead-out wires of different sizes. To ensure that lead-out wires of different sizes can all exit through the openings in the back glass, large circular openings are set in the back glass. However, excessively large openings in the back glass lead to excessive defects, resulting in decreased PV module load performance and reduced PV module safety. Moreover, the risk of different lead-out wires overlapping within conventional circular openings is high, easily leading to short circuits and reducing the PV module's power generation. Therefore, how to reduce back glass defects and minimize the risk of lead-out wire overlap and short circuits are technical problems that need to be solved by those skilled in the art. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a back glass and a photovoltaic module to solve the problems of reducing defects in the back glass and reducing the risk of short circuits due to lead wire overlap.

[0004] To solve the above-mentioned technical problems, the present invention provides a back glass, wherein the back glass is provided with at least one lead wire hole; the lead wire hole is used to pass through at least one lead wire; the lead wire includes at least two wires;

[0005] The lead-out hole includes a first lead-out hole; the first lead-out hole is a polygonal hole; the outline of the polygonal hole includes a first side, a second side, a third side, and a fourth side that are smoothly connected in sequence; the first side and the third side are arranged opposite to each other in a first direction; the second side and the fourth side are arranged opposite to each other in a second direction; the first direction is perpendicular to the second direction;

[0006] Both the first side and the third side are straight line segments; the length of the first side is less than the length of the third side; both the second side and the fourth side include a first curved segment and a second curved segment protruding outward from the contour; the first curved segment is located on the side closer to the first side, and the second curved segment is located on the side closer to the third side; the radius of curvature of the first curved segment is greater than the radius of curvature of the second curved segment.

[0007] Optionally, the back glass is provided with one of the lead wire holes; the first lead wire hole is the first lead wire hole; the lead wire hole is used to pass through at least two lead wires.

[0008] Optionally, the back glass is provided with at least two lead-out holes; each lead-out hole is used to pass through at least one lead-out wire.

[0009] Optionally, all the lead wires are led out from the lead wire holes in a direction perpendicular to the surface of the back glass;

[0010] Alternatively, at least one of the lead wires may be led out from the lead wire hole in a direction perpendicular to the back glass surface, extend a first preset distance in a direction parallel to the back glass surface, and then extend a second preset distance in a direction perpendicular to the back glass surface.

[0011] Optionally, the first preset distance is 1mm-50mm, including the values ​​at both ends.

[0012] Optionally, the radius of curvature of the first curve segment is greater than or equal to 4.5 mm;

[0013] And / or, the radius of curvature of the second curve segment is less than or equal to 4.5 mm.

[0014] Optionally, the first lead hole is used to pass through at least one first lead and / or at least one second lead; the first lead is disposed on the side closer to the third side, and the second lead is disposed on the side closer to the first side; the width direction of the first lead is parallel to the second direction, and the first lead is arranged sequentially along the first direction; the width direction of the second lead is parallel to the first direction, and the second lead is arranged sequentially along the second direction; the width of the first lead is greater than the width of the second lead.

[0015] Optionally, the spacing between adjacent second leads in the second direction is greater than or equal to 2 mm;

[0016] And / or, the distance between the first lead and the second lead in the first direction is greater than or equal to 2 mm;

[0017] And / or, the width of the first lead is 6mm-15mm, including the values ​​at both ends;

[0018] And / or, the width of the second lead is 5mm-7mm, including the values ​​at both ends.

[0019] To solve the above-mentioned technical problems, this utility model also provides a photovoltaic module, including: at least two leads, and a back glass as described above.

[0020] Optionally, the photovoltaic module further includes: a junction box; the surface of the junction box is provided with at least two slots; the lead wire is led out from the lead wire hole provided on the back glass and connected to the corresponding slot.

[0021] It is evident that the back glass provided by this utility model has the following beneficial effects compared to traditional back glass:

[0022] (1) When the back glass is provided with multiple lead-out holes, multiple lead-out wires can be led out through different lead-out holes. On the one hand, it is not necessary to set lead-out holes in the area between adjacent lead-out positions, which can reduce the opening area of ​​the back glass, thereby reducing defects in the back glass, improving the load performance of the photovoltaic module, and thus improving the safety of the photovoltaic module; on the other hand, it can reduce the risk of short circuit due to overlap, thereby improving the power generation of the photovoltaic module.

[0023] (2) When the back glass is provided with a lead hole that is narrow at the top and wide at the bottom, which is composed of straight segments of different lengths and curved segments of different radii of curvature, multiple lead wires are led out through the lead hole. Compared with the circular lead hole, the shape of the lead hole is more compatible with the distribution of lead wires of different sizes. On the one hand, it can reduce the opening area of ​​the back glass, thereby reducing defects in the back glass, improving the load performance of the photovoltaic module, and thus improving the safety of the photovoltaic module. On the other hand, it can make the lead wires of different sizes evenly distributed, thereby reducing the risk of short circuit due to overlap, thereby improving the power generation of the photovoltaic module. In addition, since a single curve with a different radius of curvature is used, it can also be compatible with existing glass production processes and glass edge grinding processes, thereby reducing the probability of defects caused by opening burrs in the lead hole of this shape.

[0024] This utility model also provides a photovoltaic module, including the aforementioned back glass, and thus has the same beneficial effects. Attached Figure Description

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

[0026] Figure 1 A schematic diagram of the outline of a first lead hole provided for an embodiment of this utility model;

[0027] Figure 2 A schematic diagram of a diode and its positive and negative leads extending from the lead hole, provided for an embodiment of this utility model;

[0028] Figure 3 A schematic diagram of a diode and its positive and negative leads is provided for an embodiment of this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the first type of lead-out hole provided in an embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the second type of lead-out hole provided in an embodiment of the present utility model;

[0031] Figure 6 A schematic diagram of the structure of the third lead hole provided in this embodiment of the utility model;

[0032] Figure 7 A cross-sectional view of a lead wire lead-out method provided for an embodiment of this utility model;

[0033] Figure 8 A top view of a lead wire lead-out method provided for an embodiment of this utility model;

[0034] Figure 9 This is a schematic diagram of a first type of multi-segment layout provided by an embodiment of the present utility model;

[0035] Figure 10 This is a schematic diagram of a second type of multi-segment layout provided for an embodiment of the present utility model.

[0036] The annotations in the attached figures are explained as follows:

[0037] 1-Back glass; 11-First lead hole; 111-First side; 112-Second side; 113-Third side; 114-Fourth side; 12-Second lead hole; 13-Third lead hole; 14-Lead wire; 141-First lead wire; 142-Second lead wire;

[0038] 21-First battery string; 211-Battery cell; 221-First busbar; 222-Second busbar; 223-Third busbar; 231-First jumper; 232-Second jumper; 24-Diode; 3-Leader position;

[0039] 3- Junction box; 31- Slot;

[0040] R1 - Radius of curvature of the first curve segment; R2 - Radius of curvature of the second curve segment; a - Spacing between adjacent second leads in the second direction; b - Spacing between the first and second leads in the first direction. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] Please refer to Figure 1 , Figure 1 This is a schematic outline of a first lead wire 141 hole provided in an embodiment of the present invention. An embodiment of the present invention provides a back glass 1, which may be provided with at least one lead wire hole; the lead wire hole is used to pass through at least one lead wire 14; the lead wire 14 includes at least two leads;

[0043] The lead-out hole includes a first lead-out hole 11; the first lead-out hole 11 is a polygonal hole; the outline of the polygonal hole includes a first side 111, a second side 112, a third side 113, and a fourth side 114 that are smoothly connected in sequence; the first side 111 and the third side 113 are arranged opposite to each other in a first direction; the second side 112 and the fourth side 114 are arranged opposite to each other in a second direction; the first direction is perpendicular to the second direction;

[0044] Both the first side 111 and the third side 113 are straight line segments; the length of the first side 111 is less than the length of the third side 113; both the second side 112 and the fourth side 114 include a first curved segment and a second curved segment protruding outward from the contour; the first curved segment is located on the side closer to the first side 111, and the second curved segment is located on the side closer to the third side 113; the radius of curvature of the first curved segment is greater than the radius of curvature of the second curved segment.

[0045] This embodiment does not limit the specific type of the lead wire 14, which can be determined according to the actual situation. For example, the lead wire 14 may include a bus bar and / or a jumper wire. It should be noted that the bus bar is located at both ends (head or tail) of the battery string and is used to connect adjacent battery strings; the jumper wire is located between adjacent battery strings and is used to connect the bus bar at the head of the battery string and the bus bar at the tail of the battery string. The jumper wire can be a circular jumper wire with a diameter of 0.1mm-0.4mm, including the values ​​at both ends; the jumper wire can also be a rectangular jumper wire with a length of 3mm-10mm, including the values ​​at both ends, and a width of 0.2mm-0.5mm, including the values ​​at both ends. The rectangular jumper wire can be an alloy jumper wire composed of Sn, Pn, and Bi. It should be noted that Sn, Pn, and Bi are common materials in the prior art. This embodiment does not limit the internal composition of the jumper wire, but directly uses an alloy jumper wire made of existing materials. This embodiment does not limit the specific size of the lead wire 14. It can be determined according to the specific type of lead wire 14. For example, the size of the lead wire 14 can be the same, different, or partially the same.

[0046] This embodiment does not limit the specific number of leads 14, which can be determined according to the actual situation, for example: Figure 2 and Figure 3 As shown, the negative lead, positive lead, or diode lead all include three leads 14. This embodiment does not limit the specific number of leads 14 holes, which can be determined according to the specific number of leads 14. For example, taking the negative lead as an example, the negative lead includes three leads 14; correspondingly, the number of leads 14 holes can be one, two, or three.

[0047] In one possible implementation, the back glass 1 in this embodiment may be provided with a lead-out hole; the lead-out hole is a first lead-out hole 11; the first lead-out hole 11 is used to pass through at least two lead-out wires 14. Taking the negative lead-out wire as an example, the negative lead-out wire may include three lead-out wires 14, such as... Figure 4 All three lead wires 14 shown are led out from the first lead wire hole 11.

[0048] It should be noted that in this embodiment, the back glass 1 is provided with only one lead wire hole, which reduces the opening area and provides safety performance, while also reducing the processing cost of the back glass 1.

[0049] In one possible implementation, the back glass 1 of this embodiment may be provided with at least two lead-out holes; each lead-out hole is used to pass through at least one lead-out wire 14. This embodiment does not limit the specific type of lead-out holes; the shapes of the lead-out holes may be the same or different. When the shapes of the lead-out holes are the same, the areas of the lead-out holes may be the same or different. When the shapes of the lead-out holes are different, in addition to the first lead-out hole 11, they may also include circular holes, rectangular holes, elliptical holes, or other polygonal holes.

[0050] Taking the negative lead as an example, the negative lead can include three leads 14, such as Figure 5 The lead-out holes shown may include a first lead-out hole 11 and a second lead-out hole 12. The first lead-out hole 11 is used to pass through two lead-out wires 14, and the second lead-out hole 12 is used to pass through one lead-out wire 14. The second lead-out wire can be a circular hole, a rectangular hole, an elliptical hole, or other polygonal hole; for example... Figure 6 The lead-out holes shown may include a first lead-out hole 11, a second lead-out hole 12, and a third lead-out hole 13; the first lead-out hole 11, the second lead-out hole 12, and the third lead-out hole 13 are all used to pass through a lead-out wire 14, and the shape of the first lead-out hole 11 and the third lead-out hole 13 may be a circular hole, a rectangular hole, an elliptical hole, or other polygonal holes.

[0051] This embodiment does not limit the specific way the lead-out line 14 is led out, for example: Figure 4 As shown, all leads 14 can be led out from the lead hole in a direction perpendicular to the surface of the back glass 1;

[0052] Or, such as Figure 7 and Figure 8 As shown, at least one lead wire 14 can be led out from the lead wire hole in a direction perpendicular to the surface of the back glass 1, then extended a first preset distance in a direction parallel to the surface of the back glass 1, and then extended a second preset distance in a direction perpendicular to the surface of the back glass 1.

[0053] It should be noted that in this embodiment, the lead wire 14, after exiting the lead wire hole, is connected to the corresponding slot 31 of the junction box 3. The latter, by leading out the lead wire 14 and then bending it before connecting it to the junction box 3, can reduce the spacing between adjacent lead wires 14 in the lead wire hole, thereby reducing the opening area of ​​the back glass 1. This embodiment does not limit the specific value of the first preset distance; for example, the first preset distance can be 1mm-50mm, including the values ​​at both ends.

[0054] In this embodiment, the first side 111 and the third side 113 are arranged opposite to each other in the first direction. Preferably, the first side 111 and the third side 113 can be parallel. In this embodiment, the second side 112 and the fourth side 114 are arranged opposite to each other in the second direction. Preferably, the second side 112 and the fourth side 114 can be symmetrical about the centerline of the first lead hole 11 that is parallel to the first direction.

[0055] This embodiment does not limit the specific values ​​of the radius of curvature R1 of the first curve segment and the radius of curvature R2 of the second curve segment. For example, the radius of curvature R1 of the first curve segment can be greater than or equal to 4.5 mm; and / or, the radius of curvature R2 of the second curve segment can be less than or equal to 4.5 mm.

[0056] This embodiment does not limit the specific arrangement of the leads 14 in the first lead hole 11. For example, the first lead hole 11 can be used to pass through at least one first lead 141 and / or at least one second lead 142. The first lead 141 is located on the side closer to the third side 113, and the second lead 142 is located on the side closer to the first side 111. The width direction of the first lead 141 is parallel to the second direction, and the first lead 141 is arranged sequentially along the first direction. The width direction of the second lead 142 is parallel to the first direction, and the second lead 142 is arranged sequentially along the second direction. The width of the first lead 141 is greater than the width of the second lead 142. The first lead 141 can be a jumper wire; the second lead 142 can be a busbar.

[0057] Taking the negative lead as an example, the negative lead can include three leads, such as... Figure 4 The first lead hole 11 shown is used to pass through one first lead 141 and two second lead 142; the first lead 141 is located on the side near the third side 113, and the second lead 142 is located on the side near the first side 111; the width direction of the first lead 141 is parallel to the second direction; the width direction of the second lead 142 is parallel to the first direction, and the second lead 142 are arranged sequentially along the second direction; the width of the first lead 141 is greater than the width of the second lead 142.

[0058] This embodiment does not limit the specific value of the width of the first lead 141. For example, the width of the first lead 141 can be 6mm-15mm, including the values ​​at both ends. This embodiment does not limit the specific value of the width of the second lead 142. For example, the width of the second lead 142 can be 5mm-7mm, including the values ​​at both ends.

[0059] This embodiment does not limit the specific value of the spacing 'a' of the second lead 142. For example, the spacing 'a' of adjacent second lead 142 in the second direction can be greater than or equal to 2 mm. This embodiment does not limit the specific value of the spacing 'b' of the first lead 141 and the second lead 142. For example, the spacing 'b' of the first lead 141 and the second lead 142 in the first direction can be greater than or equal to 2 mm.

[0060] Based on the above embodiments, the present invention has the following advantages over traditional back glass:

[0061] (1) When the back glass is provided with multiple lead-out holes, multiple lead-out wires can be led out through different lead-out holes. On the one hand, it is not necessary to set lead-out holes in the area between adjacent lead-out positions, which can reduce the opening area of ​​the back glass, thereby reducing defects in the back glass, improving the load performance of the photovoltaic module, and thus improving the safety of the photovoltaic module; on the other hand, it can reduce the risk of short circuit due to overlap, thereby improving the power generation of the photovoltaic module.

[0062] (2) When the back glass is provided with a lead hole that is narrow at the top and wide at the bottom, which is composed of straight segments of different lengths and curved segments of different radii of curvature, multiple lead wires are led out through the lead hole. Compared with the circular lead hole, the shape of the lead hole is more compatible with the distribution of lead wires of different sizes. On the one hand, it can reduce the opening area of ​​the back glass, thereby reducing defects in the back glass, improving the load performance of the photovoltaic module, and thus improving the safety of the photovoltaic module. On the other hand, it can make the lead wires of different sizes evenly distributed, thereby reducing the risk of short circuit due to overlap, thereby improving the power generation of the photovoltaic module. In addition, since a single curve with a different radius of curvature is used, it can also be compatible with existing glass production processes and glass edge grinding processes, thereby reducing the probability of defects caused by opening burrs in the lead hole of this shape.

[0063] This utility model embodiment also provides a photovoltaic module, which includes: at least two leads 14, and a back glass 1 as described above.

[0064] It should be noted that, in addition to the back glass 1, the photovoltaic module in this embodiment also includes a back film, a battery string layer, a front film, and a front glass arranged sequentially in a direction away from the surface of the back glass 1; wherein, the battery string layer includes at least two battery strings; the battery string includes at least two battery cells 211; and the lead wire 14 is located in the battery string layer.

[0065] This embodiment does not limit the specific type of solar cell 211. For example, solar cell 211 can be a whole photovoltaic cell 211, or it can be a whole photovoltaic cell divided into multiple slices, such as a quarter-slice solar cell. The size of the whole photovoltaic cell can be 166nm-300nm, including the values ​​at both ends.

[0066] This embodiment does not limit the specific arrangement of the battery cells 211 in the battery string layer. For example, taking the battery cell 211 as a four-cell battery cell 211 as an example, the following arrangement can be adopted:

[0067] like Figure 9 As shown, the battery string layer includes a first busbar 221, a second busbar 222 and a third busbar 223, a first jumper 231 and a second jumper 232, a first battery string group 21 and a second battery string group, and three diodes 24.

[0068] The first busbar 221, the second busbar 222, and the third busbar 223 are arranged sequentially along the first direction and all extend along the second direction; the first jumper 231 and the second jumper 232 are arranged sequentially along the second direction and all extend along the first direction.

[0069] The first battery string group 21 and the second battery string group are arranged sequentially along the first direction, and each includes 6 first battery strings 21 arranged sequentially along the second direction; the 6 first battery strings 21 are arranged sequentially along the second direction, and each first battery string 21 includes battery cells 211 arranged sequentially along the first direction.

[0070] The first battery string group 21 is connected to the first busbar 221 and the second busbar 222 at both ends along the first direction; the second battery string group is connected to the second busbar 222 and the third busbar 223 at both ends along the first direction.

[0071] The first jumper 231 is located between the second and third first battery strings 21; the two ends of the first jumper 231 are connected to the first busbar 221 and the third busbar 223, respectively; the second jumper 232 is located between the fourth and fifth first battery strings 21; the two ends of the second jumper 232 are connected to the first busbar 221 and the second busbar 222, respectively.

[0072] Two adjacent first battery strings 21 are connected in parallel to form three second battery strings; the three second battery strings are connected in series to form a third battery string; the third battery string in the first battery string group 21 and the third battery string in the second battery string group are connected in parallel.

[0073] All three diodes 24 are mounted on the second busbar 222.

[0074] like Figure 10 As shown, the battery string layer includes a first busbar 221, a second busbar 222 and a third busbar 223, a first jumper 231 and a second jumper 232, a first battery string group 21 and a second battery string group, and four diodes 24.

[0075] The first busbar 221, the second busbar 222, and the third busbar 223 are arranged sequentially along the first direction and all extend along the second direction; the first jumper 231 and the second jumper 232 are arranged sequentially along the second direction and all extend along the first direction.

[0076] The first battery string group 21 and the second battery string group are arranged sequentially along the first direction, and each includes 6 first battery strings 21 arranged sequentially along the second direction; the 6 first battery strings 21 are arranged sequentially along the second direction, and each first battery string 21 includes battery cells 211 arranged sequentially along the first direction. Figure 10 (not shown in the image)

[0077] The first battery string group 21 is connected to the first busbar 221 and the second busbar 222 at both ends along the first direction; the second battery string group is connected to the second busbar 222 and the third busbar 223 at both ends along the first direction.

[0078] The first jumper 231 is located between the first battery string 21 and the second battery string 21; the two ends of the first jumper 231 are connected to the first bus bar 221 and the third bus bar 223 respectively; the second jumper 232 is located between the fifth battery string 21 and the sixth battery string 21; the two ends of the second jumper 232 are connected to the first bus bar 221 and the second bus bar 222 respectively.

[0079] Three adjacent first battery strings 21 are connected in parallel to form two second battery strings; the two second battery strings are connected in series to form a third battery string; the third battery string in the first battery string group 21 and the third battery string in the second battery string group are connected in parallel.

[0080] Two diodes 24 are provided on both the first jumper 231 and the second jumper 232.

[0081] It should be noted that the back glass 1 in this embodiment can be applied to Figure 9 and Figure 10 The layout scheme shown can also be applied to other layout schemes.

[0082] Furthermore, such as Figure 7 As shown, the photovoltaic module in this embodiment may further include: a junction box 3; the surface of the junction box 3 is provided with at least two slots 31; and the lead wire 14 is led out from the lead wire hole provided on the back glass 1 and connected to the corresponding slot 31. It should be noted that when the lead wire 14 is led out from the lead wire hole in a direction perpendicular to the surface of the back glass 1, then extended a first preset distance in a direction parallel to the surface of the back glass 1, and then extended a second preset distance in a direction perpendicular to the surface of the back glass 1, the opening of the slot 31 in the junction box 3 must match the shape of the extended lead wire 14 to reserve space for the extended lead wire 14.

[0083] It should be noted that, as Figure 9 As shown, in this embodiment... Figure 9 At position 25, multiple busbars and jumpers are led out from the lead hole in the back glass 1 corresponding to position 25 and connected to the junction box 3. The junction box 3 enables safe and reliable electrical connection with other devices.

[0084] Based on the above embodiments, this utility model includes the aforementioned back glass, and therefore also has the aforementioned beneficial effects.

[0085] The foregoing has provided a detailed description of the back glass and photovoltaic module provided by this utility model. For those skilled in the art, based on the ideas of the embodiments of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A back glass, characterized in that, The back glass is provided with at least one lead-out hole; the lead-out hole is used to pass through at least one lead-out wire; the lead-out wire includes at least two wires; The lead-out hole includes a first lead-out hole; the first lead-out hole is a polygonal hole; the outline of the polygonal hole includes a first side, a second side, a third side, and a fourth side that are smoothly connected in sequence; the first side and the third side are arranged opposite to each other in a first direction; the second side and the fourth side are arranged opposite to each other in a second direction; the first direction is perpendicular to the second direction; Both the first side and the third side are straight line segments; the length of the first side is less than the length of the third side; both the second side and the fourth side include a first curved segment and a second curved segment protruding outward from the contour; the first curved segment is located on the side closer to the first side, and the second curved segment is located on the side closer to the third side; the radius of curvature of the first curved segment is greater than the radius of curvature of the second curved segment.

2. The back glass according to claim 1, characterized in that, The back glass is provided with a lead wire hole; the lead wire hole is the first lead wire hole; the first lead wire hole is used to pass through at least two lead wires.

3. The back glass according to claim 1, characterized in that, The back glass is provided with at least two lead wire holes; each lead wire hole is used to pass through at least one lead wire.

4. The back glass according to claim 1, characterized in that, All of the lead wires are led out from the lead wire holes in a direction perpendicular to the surface of the back glass; Alternatively, at least one of the lead wires may be led out from the lead wire hole in a direction perpendicular to the back glass surface, extend for a first preset distance in a direction parallel to the back glass surface, and then extend for a second preset distance in a direction perpendicular to the back glass surface.

5. The back glass according to claim 4, characterized in that, The first preset distance is 1mm-50mm, including the values ​​at both ends.

6. The back glass according to claim 1, characterized in that, The radius of curvature of the first curve segment is greater than or equal to 4.5 mm; And / or, the radius of curvature of the second curve segment is less than or equal to 4.5 mm.

7. The back glass according to any one of claims 1 to 6, characterized in that, The first lead hole is used to pass through at least one first lead and / or at least one second lead; the first lead is disposed on the side closer to the third side, and the second lead is disposed on the side closer to the first side; the width direction of the first lead is parallel to the second direction, and the first lead is arranged sequentially along the first direction; the width direction of the second lead is parallel to the first direction, and the second lead is arranged sequentially along the second direction; the width of the first lead is greater than the width of the second lead.

8. The back glass according to claim 7, characterized in that, The spacing between adjacent second leads in the second direction is greater than or equal to 2 mm; And / or, the distance between the first lead and the second lead in the first direction is greater than or equal to 2 mm; And / or, the width of the first lead is 6mm-15mm, including the values ​​at both ends; And / or, the width of the second lead is 5mm-7mm, including the values ​​at both ends.

9. A photovoltaic module, characterized in that, include: At least two lead wires, and a back glass as described in any one of claims 1 to 8.

10. The photovoltaic module according to claim 9, characterized in that, Also includes: Junction box; the surface of the junction box is provided with at least two slots; the lead wire is led out from the lead wire hole provided on the back glass and connected to the corresponding slot.

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