Backsheet, photovoltaic module and photovoltaic power generation system

Abstract

This utility model discloses a backsheet, a photovoltaic module, and a photovoltaic power generation system. The backsheet has at least one lead hole. The outer contour of the lead hole can be divided into four equal curve segments. Each curve segment is a line segment protruding away from the center of the lead hole. The lead hole is not perfectly circular. The maximum distance of the outer contour of the lead hole in a first direction is 'a', and the maximum distance in a second direction is 'b'. The first direction is perpendicular to the second direction. The relationship between 'a' and 'b' satisfies: 1.1 ≤ b / a ≤ 2.5. According to this utility model, the stress at the lead hole is reduced, the load-bearing capacity of the backsheet is improved, thereby extending the service life of the backsheet and the photovoltaic module, reducing the installation difficulty of the photovoltaic module, and improving installation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a backsheet, a photovoltaic module, and a photovoltaic power generation system. Background Technology

[0002] Photovoltaics is short for solar photovoltaic power generation system. It is a new type of power generation system that uses the photovoltaic effect of photovoltaic cell semiconductor materials to directly convert solar radiation energy into electrical energy. It can be operated independently or connected to the grid.

[0003] In related technologies, openings are formed on the backsheet of photovoltaic modules to allow leads to be brought out for use. However, during use, photovoltaic modules have relatively weak load-bearing capacity and are easily damaged, thus shortening their lifespan. Furthermore, installing photovoltaic modules is quite difficult. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a backsheet that reduces stress at the lead holes, improves the load-bearing capacity of the backsheet, thereby extending the service life of the backsheet and photovoltaic modules, reducing the installation difficulty of the photovoltaic modules, and improving installation efficiency.

[0005] Another objective of this invention is to provide a photovoltaic module.

[0006] Another objective of this invention is to provide a photovoltaic power generation system employing the aforementioned backsheet or photovoltaic modules.

[0007] According to a first aspect embodiment of the present invention, a back plate is provided with at least one lead hole. The outer contour of the lead hole can be divided into four equal curve segments. Each curve segment is formed as a line segment protruding in a direction away from the center of the lead hole. The lead hole is a non-circular hole. The maximum distance of the outer contour of the lead hole in a first direction is a, and the maximum distance of the outer contour of the lead hole in a second direction is b. The first direction is perpendicular to the second direction, and the relationship between a and b satisfies: 1.1 ≤ b / a ≤ 2.5.

[0008] According to this utility model, the backsheet has a reasonable design for the lead holes, which reduces the stress at the lead hole locations, effectively improves the load-bearing capacity of the backsheet, makes it less prone to damage, and thus extends the service life of the backsheet, and consequently, the service life of the photovoltaic module. Furthermore, it reduces the difficulty of passing the leads through the lead holes, thereby improving the assembly efficiency of the leads and the backsheet, and ultimately increasing the installation efficiency of the photovoltaic module.

[0009] According to the photovoltaic module of this utility model, 'a' further satisfies: 8mm ≤ a ≤ 18mm; and / or, 'b' further satisfies: 10mm ≤ b ≤ 20mm.

[0010] According to the photovoltaic module of this utility model, the outer contour lines of the lead hole are symmetrical about the axis of the first direction and the axis of the second direction, respectively.

[0011] According to the photovoltaic module of this utility model, a reflector is provided on the back panel. The reflector includes a plurality of first reflective segments and a plurality of second reflective segments. The first reflective segments extend along a first direction, and the second reflective segments extend along a second direction. The end of the first reflective segment adjacent to the lead hole is spaced apart from the lead hole, and the end of the second reflective segment adjacent to the lead hole is spaced apart from the lead hole.

[0012] According to the photovoltaic module of this utility model, the distance between the end of the first reflective segment adjacent to the lead hole and the outer contour line of the lead hole is L1, wherein L1 satisfies: 20mm≤L1≤70mm; and / or, the distance between the end of the second reflective segment adjacent to the lead hole and the outer contour line of the lead hole is L2, wherein L2 satisfies: 55mm≤L2≤105mm.

[0013] A photovoltaic module according to a second aspect of the present invention includes: a backsheet, wherein at least one lead hole is formed on the backsheet, the outer contour line of the lead hole can be divided into four equal curve segments, the lead hole is a non-circular hole, the lead hole has a first axis and a second axis, the first axis is parallel to the long side of the photovoltaic module, the second axis is parallel to the short side of the photovoltaic module, the first axis is perpendicular to the second axis, the maximum distance of the outer contour line of the lead hole in the direction of the first axis is a, the length of the long side of the photovoltaic module is w1, wherein a and w1 respectively satisfy: 0.003≤a / w1≤0.03; and / or, the maximum distance of the outer contour line of the lead hole in the direction of the second axis is b, the length of the short side of the photovoltaic module is w2, wherein b and w2 respectively satisfy: 0.007≤b / w2≤0.03.

[0014] According to some embodiments of the present invention, the photovoltaic module further includes: a plurality of solar cells, wherein the plurality of solar cells are disposed on one side of the back sheet, and the orthographic projection of the solar cell adjacent to the lead hole along the first direction on the back sheet overlaps with a portion of the lead hole.

[0015] According to some embodiments of the present invention, the distance between the edge of the battery cell facing the lead hole along the first direction and the outer contour line of the lead hole is M1, wherein M1 satisfies: 0mm < M1 ≤ 8mm.

[0016] According to some embodiments of the present invention, the photovoltaic module further includes: a plurality of solar cells, the plurality of solar cells being disposed on one side of the back sheet, and a gap being formed between the outer contour line of the lead hole and the corresponding edge of the solar cell adjacent to the lead hole along the first direction.

[0017] According to some embodiments of the present invention, the gap is M2, wherein M2 satisfies: 0mm < M2 ≤ 2mm.

[0018] A photovoltaic power generation system according to a third aspect of the present invention includes a backsheet according to the first aspect of the present invention, or a photovoltaic module according to the second aspect of the present invention.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the back plate according to an embodiment of the present utility model;

[0022] Figure 2 yes Figure 1 An enlarged view of part A, shown in the center circle;

[0023] Figure 3 This is a schematic diagram of the assembly of the lead hole and lead of the photovoltaic module according to an embodiment of the present utility model.

[0024] Figure 4 This is a cross-sectional view of the lead hole and lead assembly of a photovoltaic module according to an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the lead hole and the solar cell of a photovoltaic module according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram illustrating another configuration of the lead hole and solar cell of a photovoltaic module according to an embodiment of the present invention.

[0027] Figure label:

[0028] 100. Photovoltaic modules;

[0029] 1. Backplate; 11. Lead hole; 111. First axis; 112. Second axis;

[0030] 12. Reflector; 121. First reflective section; 122. Second reflective section;

[0031] 2. Long side; 3. Short side; 4. Battery cell; 5. Lead wire. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1 and Figure 2 The backplate 1 according to a first aspect embodiment of the present invention is described. The backplate 1 can be used in a photovoltaic module 100, but is not limited thereto. In the following description of this application, the backplate 1 is described as being used in a photovoltaic module 100.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, according to the first aspect embodiment of the present invention, the back plate 1 has at least one lead hole 11 formed on it. The outer contour line of the lead hole 11 can be divided into four equal curve segments. Each curve segment is formed as a line segment protruding in a direction away from the center of the lead hole 11. The lead hole 11 is a non-circular hole. The outer contour line of the lead hole 11 is in a first direction (e.g., Figure 1 The maximum distance in the vertical direction (as shown) is amm, and the outer contour line of the lead hole 11 in the second direction (as shown) Figure 1 The maximum distance in the left and right directions is b mm. The first direction is perpendicular to the second direction. The relationship between a and b satisfies: 1.1≤b / a≤2.5.

[0034] For example, in Figure 1 , Figure 2 and Figure 3 In the example, the lead hole 11 extends along the thickness direction of the back plate 1. Four equal curves are connected sequentially to form the outer contour line of the lead hole 11. The connection between adjacent curves is arc-shaped, and the middle part of the curve protrudes away from the center of the lead hole 11. The maximum distance 'a' of the outer contour line of the lead hole 11 in the first direction is less than the maximum distance 'b' of the outer contour line of the lead hole 11 in the second direction. The lead wire 5 (or the busbar of the photovoltaic module 100) on the photovoltaic module 100 passes through the lead hole 11 and connects to the junction box of the photovoltaic module 100 (not shown in the figure).

[0035] When b / a is less than 1.1, the difference between a and b is small, causing the outer contour of the lead hole 11 to tend towards a circle. This results in higher stress on the lead hole 11, reducing its load-bearing capacity and the mechanical load-bearing capacity of the backsheet 1. Consequently, the backsheet 1 is more prone to breakage when the photovoltaic module 100 is subjected to natural impacts, thus shortening the lifespan of the photovoltaic module 100. When b / a is greater than 2.5, the difference between a and b is large, leading to a greater flatness of the lead hole 11, which also reduces its load-bearing capacity and the mechanical load-bearing capacity of the backsheet 1. Alternatively, a smaller a value increases the difficulty of the lead 5 passing through the lead hole 11, thereby reducing the assembly efficiency of the lead 5 and the backsheet 1.

[0036] For example, the lead hole 11 can be an elliptical hole, but it is not limited to this. It should be noted that the shape of the lead hole 11 can be specifically set according to the actual application to meet practical needs. Testing was conducted on the photovoltaic module 100 using a method where the lead hole is a circular hole, as in traditional technology. Specifically, two identical backsheets 1 were equipped with lead holes 11 that were circular and elliptical, respectively. The results are shown in Tables 1 and 2 below:

[0037] Table 1 Mechanical Load Test

[0038]

[0039] Table 2 Mechanical Load Simulation Test

[0040]

[0041] Referring to Table 1, the experimental test results show that when the lead hole 11 on the backsheet 1 is an elliptical hole, the photovoltaic module 100 has a stronger mechanical load-bearing capacity. Referring to Table 2, the simulation test results show that under the same positive pressure value, when the lead hole 11 is an elliptical hole, the stress at the hole position on the backsheet 1 is lower. The lower the stress, the safer the backsheet 1 is, meaning it is less prone to damage, thus extending the service life of the backsheet 1, and consequently extending the service life of the photovoltaic module 100. Furthermore, the directional arrangement of the photovoltaic module 100 and the lead hole further improves the load-bearing capacity of the photovoltaic module 100.

[0042] By setting the relationship between a and b to satisfy 1.1≤b / a≤2.5, the maximum distance between the outer contour of the lead hole 11 along the first and second directions is reasonably set, thereby reducing the stress on the lead hole 11, improving its load-bearing capacity, and consequently improving the mechanical load-bearing capacity of the backsheet 1. When the photovoltaic module 100 is subjected to natural impact, the backsheet 1 is less likely to break, thus extending the service life of the photovoltaic module 100. Furthermore, it reduces the difficulty of the lead 5 passing through the lead hole 11, thereby improving the assembly efficiency of the lead 5 and the backsheet 1, and increasing the installation efficiency of the photovoltaic module 100. Moreover, the ratio of b to a also increases the effective utilization area of ​​the lead hole 11 on the backsheet 1. In addition, the setting of the outer contour of the lead hole 11 reduces stress concentration on curved segments, thereby reducing the stress at the lead hole 11, improving the mechanical load-bearing capacity of the backsheet 1, reducing the probability of damage to the backsheet 1, and extending its service life.

[0043] According to the backplate 1 of this utility model, the lead hole 11 is reasonably set, which reduces the stress at the hole position, effectively improves the load-bearing capacity of the backplate 1, makes the backplate 1 less prone to damage, and thus extends the service life of the backplate 1, thereby extending the service life of the photovoltaic module 100. In addition, it reduces the difficulty of the lead 5 passing through the lead hole 11, thereby improving the assembly efficiency of the lead 5 and the backplate 1, and improving the installation efficiency of the photovoltaic module 100.

[0044] According to some embodiments of this utility model, refer to Figure 3 and Figure 4 a further satisfies: 8mm≤a≤18mm; and / or b further satisfies: 10mm≤b≤20mm.

[0045] Reference Figure 3 and Figure 4Furthermore, 'a' must satisfy the condition: 8mm ≤ a ≤ 18mm. For example, when 'a' is less than 8mm, the length of the first axis 111 is small, increasing the difficulty for the lead wire 5 to pass through the lead hole 11. When 'a' is greater than 18mm, the difference between the length of the first axis 111 and the length of the second axis 112 is small, causing the lead hole 11 to deviate towards a round hole, thereby reducing the load-bearing capacity of the lead hole 11 and the mechanical load-bearing capacity of the backsheet 1. Moreover, when the length of the first axis 111 is long, it increases the overlap distance between the lead hole 11 and the surrounding solar cells 4, making the solar cells 4 prone to breakage during lamination. Therefore, by setting 'a' to satisfy: 8mm ≤ a ≤ 18mm, the length of the first axis 111 is reasonably set, thereby reducing the difficulty for the lead wire 5 to pass through the lead hole 11 and improving assembly efficiency. In addition, it also improves the load-bearing capacity of the lead hole 11, thereby improving the mechanical load-bearing capacity of the backsheet 1 and the photovoltaic module 100, which is beneficial to extending the service life of the photovoltaic module 100. In addition, the probability of cell 4 breaking is reduced during the lamination process.

[0046] Reference Figure 3 and Figure 4 Furthermore, b must satisfy the condition: 10mm ≤ b ≤ 20mm. For example, when b is less than 10mm, the length of the second axis 112 is smaller, reducing the difference between the length of the second axis 112 and the length of the first axis 111, causing the lead hole 11 to deviate towards a round hole, thereby reducing the load-bearing capacity of the lead hole 11 and the mechanical load-bearing capacity of the back plate 1. When b is greater than 20mm, the length of the second axis 112 is larger, reducing the load-bearing capacity of the lead hole 11 and the mechanical load-bearing capacity of the back plate 1. Therefore, by setting b to further satisfy: 10mm ≤ b ≤ 20mm, the length of the second axis 112 is reasonably set, thus making the difference between the length of the second axis 112 and the length of the first axis 111 reasonable, thereby improving the load-bearing capacity of the lead hole 11 and the mechanical load-bearing capacity of the back plate 1.

[0047] Reference Figure 3 The outer contour lines of the lead hole 11 are symmetrical about the axis containing the first direction and the axis containing the second direction, respectively. For example, in example 3, the outer contour lines of the lead hole 11 can be symmetrically arranged in the vertical direction or in the horizontal direction. This arrangement improves the uniformity of circumferential stress distribution of the lead hole 11, thereby improving the load-bearing capacity of the lead hole 11 and further improving the mechanical load-bearing capacity of the back plate 1. In addition, making the lead hole 11 a regular shape reduces the manufacturing difficulty of the lead hole 11 and improves the manufacturing efficiency of the lead hole 11. Moreover, it also facilitates the use of the lead hole 11. According to some embodiments of this utility model, refer to Figure 1 and Figure 2The backplate 1 is provided with a reflector 12, which includes a plurality of first reflective segments 121 and a plurality of second reflective segments 122. The first reflective segments 121 are arranged along a first direction (e.g., Figure 1 The second reflective segment 122 extends along the second direction (as shown in the vertical direction), and extends along the second direction (as shown in the vertical direction). Figure 1 Extending in the left-right direction (as shown), the end of the first reflective segment 121 near the lead hole 11 is spaced apart from the lead hole 11, and the end of the second reflective segment 122 near the lead hole 11 is spaced apart from the lead hole 11.

[0048] For example, in Figure 1 and Figure 2 In the example, the reflector 12 is disposed on the side of the backplate 1 facing the solar cell 4, with the gap between the reflector 12 and the adjacent solar cell 4 being opposite. A first reflective segment 121 extends vertically, and multiple first reflective segments 121 are arranged at intervals in the left-right direction. A second reflective segment 122 extends horizontally, and multiple second reflective segments 122 are arranged at intervals in the vertical direction. The first reflective segments 121 located on the upper and lower sides of the lead hole 11 have gaps between them and the lead hole 11, and the second reflective segments 122 located on the left and right sides of the lead hole 11 have gaps between them and the lead hole 11. With this arrangement, when sunlight shines on the solar cell 4, the sunlight passes through the gaps between adjacent solar cells 4 and shines on the reflector 12. The reflector 12 reflects the sunlight onto the surface of the solar cell 4, allowing the light to be reused, thereby improving the photoelectric conversion efficiency of the photovoltaic module 100. In addition, the reflector 12 is a white glaze part, which is relatively brittle. The gap between the first reflective section 121 and the second reflective section 122 around the lead hole 11 and the edge of the lead hole 11 effectively reduces the influence of the brittleness of the reflector 12 on the mechanical load bearing capacity of the lead hole 11, thereby improving the load bearing capacity of the back plate 1.

[0049] According to some embodiments of this utility model, refer to Figure 2 The distance between the end of the first reflective segment 121 near the lead hole 11 and the outer edge of the lead hole 11 is L1, where L1 satisfies: 20mm ≤ L1 ≤ 70mm. For example, in Figure 2In the example, when the distance L1 between the end of the first reflective segment 121 near the lead hole 11 and the outer edge of the lead hole 11 is less than 20 mm, the distance between the aforementioned end of the first reflective segment 121 and the lead hole 11 is small, and the brittleness of the first reflective segment 121 has a greater impact on the lead hole 11, reducing the load-bearing capacity of the backplate 1. When the distance L1 between the end of the first reflective segment 121 near the lead hole 11 and the outer edge of the lead hole 11 is greater than 70 mm, the distance between the aforementioned end of the first reflective segment 121 and the lead hole 11 is large, shortening the length of the first reflective segment 121, thereby reducing the amount of sunlight reflected by the first reflective segment 121 and reducing the photoelectric conversion capability of the photovoltaic module 100. Therefore, by setting the distance L1 between the end of the first reflective segment 121 near the lead hole 11 and the outer edge of the lead hole 11 to satisfy 20mm≤L1≤70mm, the setting is reasonable, thereby reducing the impact of the brittleness of the first reflective segment 121 on the lead hole 11 and improving the load-bearing capacity of the backplate 1. In addition, the length of the first reflective segment 121 is extended, thereby increasing the amount of sunlight reflected by the first reflective segment 121 and improving the photoelectric conversion capability of the photovoltaic module 100. Preferably, L1 is 45mm. Along the vertical direction, the distance between the ends of the first reflective segments 121 near the lead hole 11 on both the upper and lower sides of the lead hole 11 is L3, which is 90mm.

[0050] According to some other embodiments of the present invention, refer to Figure 2 The distance between the end of the second reflective segment 122 near the lead hole 11 and the outer edge of the lead hole 11 is L2, where L2 satisfies: 55mm ≤ L2 ≤ 105mm. For example, in Figure 2In the example, when the distance L2 between the end of the second reflective segment 122 near the lead hole 11 and the outer edge of the lead hole 11 is less than 55 mm, the distance between the aforementioned end of the second reflective segment 122 and the lead hole 11 is small, and the brittleness of the second reflective segment 122 has a greater impact on the lead hole 11, reducing the load-bearing capacity of the backplate 1. When the distance L2 between the end of the second reflective segment 122 near the lead hole 11 and the outer edge of the lead hole 11 is greater than 105 mm, the distance between the aforementioned end of the second reflective segment 122 and the lead hole 11 is large, shortening the length of the second reflective segment 122, thereby reducing the amount of sunlight reflected by the second reflective segment 122 and reducing the photoelectric conversion capability of the photovoltaic module 100. Therefore, by setting the distance L2 between the end of the second reflective section 122 near the lead hole 11 and the outer edge of the lead hole 11 to satisfy 55mm≤L2≤105mm, the setting is reasonable, thereby reducing the impact of the brittleness of the second reflective section 122 on the lead hole 11 and improving the load-bearing capacity of the backplate 1. In addition, the length of the second reflective section 122 is extended, thereby increasing the amount of sunlight reflected by the second reflective section 122 and improving the photoelectric conversion capability of the photovoltaic module 100. Preferably, L2 is 80mm. Along the left-right direction, the distance between the ends of the second reflective sections 122 near the lead hole 11 on both sides of the lead hole 11 is L4, which is 160mm.

[0051] According to some other embodiments of the present invention, referring to Figure 2 The distance between the end of the first reflective segment 121 near the lead hole 11 and the outer edge of the lead hole 11 is L1, and the distance between the end of the second reflective segment 122 near the lead hole 11 and the outer edge of the lead hole 11 is L2. L1 and L2 satisfy the following conditions: 20mm ≤ L1 ≤ 70mm, 55mm ≤ L2 ≤ 105mm. Therefore, the reasonable setting of L1 and L2 reduces the impact of the brittleness of the first and second reflective segments 121 and 122 on the lead hole 11, improving the load-bearing capacity of the backsheet 1. Furthermore, extending the length of the first and second reflective segments 121 and 122 increases the amount of sunlight reflected by them, improving the photoelectric conversion capability of the photovoltaic module 100.

[0052] like Figure 1 and Figure 2 As shown, the photovoltaic module 100 according to the second aspect embodiment of the present invention includes a backsheet 1.

[0053] Specifically, at least one lead hole 11 is formed on the back plate 1. The outer contour of the lead hole 11 can be divided into four equal curve segments. The lead hole 11 is a non-circular hole. The lead hole 11 has a first axis 111 and a second axis 112. The first axis 111 is parallel to the long side 2 of the photovoltaic module 100, and the second axis 112 is parallel to the short side 3 of the photovoltaic module 100. The first axis 111 and the second axis 112 are perpendicular. The maximum distance between the outer contour of the lead hole 11 in the direction of the first axis 111 is a mm, and the length of the long side 2 of the photovoltaic module 100 is w1 mm. Wherein, a and w1 satisfy: 0.003≤a / w1≤0.03; and / or, the maximum distance between the outer contour of the lead hole 11 in the direction of the second axis 112 is b mm, and the length of the short side 3 of the photovoltaic module 100 is w2 mm. Wherein, b and w2 satisfy: 0.007≤b / w2≤0.03.

[0054] For example, in Figures 1-4 In the example, along the thickness direction of the backplate 1, the lead hole 11 penetrates the backplate 1, and four equal curves are connected in sequence to form the outer contour line of the lead hole 11, with the connection point of adjacent curves being arc-shaped. The photovoltaic module 100 is roughly rectangular, and the lead hole 11 is directionally set with the photovoltaic module 100 (i.e., the first axis 111 is parallel to the long side 2 of the photovoltaic module 100, and the second axis 112 is parallel to the short side 3 of the photovoltaic module 100). The lead 5 on the photovoltaic module 100 passes through the lead hole 11 and connects to the junction box of the photovoltaic module 100 (not shown in the figure). The length of the second axis 112 is greater than the length of the first axis 111, and the length of the long side 2 is greater than the length of the short side 3. Among them, the setting of the lead hole 11 and the photovoltaic module 100 includes the following cases: First, the length of the first axis 111 is a mm, and the length of the long side 2 is w1 mm, where a and w1 respectively satisfy: 0.003≤a / w1≤0.03. Second, the length of the second axis 112 is b mm, and the length of the short side 3 is w2 mm, where b and w2 satisfy 0.007 ≤ b / w2 ≤ 0.03. Third, the length of the first axis 111 is a mm, the length of the long side 2 is w1 mm, the length of the second axis 112 is b mm, and the length of the short side 3 is w2 mm, where a, w1, b, and w2 satisfy 0.003 ≤ a / w1 ≤ 0.03 and 0.007 ≤ b / w2 ≤ 0.03.

[0055] When a / w1 is less than 0.003, the length of the first axis 111 is relatively small, increasing the difficulty for the lead wire 5 to pass through the lead hole 11, thereby reducing the installation efficiency of the photovoltaic module 100. When a / w1 is greater than 0.03, the length of the first axis 111 is relatively long, and the difference between the length of the first axis 111 and the length of the second axis 112 decreases, making the lead hole 11 more inclined to a round hole, thereby reducing the load-bearing capacity of the backsheet 1. When the photovoltaic module 100 is under heavy load, the backsheet 1 is easily broken, thus shortening the service life of the backsheet 1.

[0056] When b / w2 is less than 0.07, the length of the second axis 112 is relatively small, and the difference between the length of the second axis 112 and the length of the first axis 111 decreases. This makes the lead hole 11 more biased towards a round hole, thereby reducing the load-bearing capacity of the backsheet 1. When the photovoltaic module 100 is under heavy load, the backsheet 1 is prone to breakage, thus shortening its service life. When b / w2 is greater than 0.03, the length of the second axis 112 is relatively long, reducing the mechanical load-bearing capacity of the backsheet 1, thus shortening its service life.

[0057] This configuration ensures that the length amm of the first axis 111 and the length w1mm of the long side 2 satisfy 0.003≤a / w1≤0.03, and the length bmm of the second axis 112 and the length w2mm of the short side 3 satisfy 0.007≤b / w2≤0.03. This reasonable configuration further enhances the mechanical load-bearing capacity of the backsheet 1, preventing breakage of the backsheet 1 under heavy loads on the photovoltaic module 100, and thus extending the service life of the photovoltaic module 100. It also reduces the difficulty of passing the lead wire 5 through the lead hole 11, improving installation efficiency. Furthermore, compared to the racetrack-shaped lead hole in traditional technology, the elliptical hole easily disperses stress when the backsheet 1 is subjected to external force, avoiding stress concentration and reducing the degree of stress concentration in the lead hole 22, thereby improving the load-bearing capacity of the backsheet 1.

[0058] According to some embodiments of this utility model, refer to Figure 5 The photovoltaic module 100 also includes a plurality of solar cells 4, which are disposed on one side of the backsheet 1 along a first direction (e.g., Figure 5 The vertical direction shown indicates that the orthographic projection of the battery cell 4 adjacent to the lead hole 11 on the back plate 1 overlaps with a portion of the lead hole 11. In the description of this utility model, "a plurality of" means two or more. For example, in... Figure 1 and Figure 5In the example, multiple solar cells 4 are arranged sequentially and at intervals on the front side of the backsheet 1. Two solar cells 4 are arranged above the lead hole 11, with their adjacent lower corners overlapping the upper end of the lead hole 11. Similarly, two solar cells 4 are arranged below the lead hole 11, with their adjacent upper corners overlapping the lower end of the lead hole 11. This arrangement results in a longer length of the lead hole 11 in the vertical direction, meaning a longer first axis 111, facilitating the passage of the lead wire 5 through the lead hole 11. This reduces the assembly difficulty of the lead wire 5 with the backsheet 1 and improves the assembly efficiency of the photovoltaic module 100. Furthermore, a spacer (not shown) can be placed between the solar cell 4 and the backsheet 1, thereby reducing the probability of the solar cell 4 breaking during the lamination process and extending the production efficiency of the photovoltaic module 100.

[0059] According to some embodiments of this utility model, refer to Figure 5 Along the first direction, the distance between the edge of the battery cell 4 facing the lead hole 11 and the outer contour line of the lead hole 11 is M1, where M1 satisfies: 0mm < M1 ≤ 8mm. For example, in Figure 5 In the example, the portion where the upper end of the lead hole 11 overlaps with the corresponding solar cell 4 is used as an example for detailed explanation. The distance between the lower edge of the solar cell 4 and the outer contour line of the upper end of the lead hole 11 is M1. When M1 is greater than 8mm, the area of ​​overlap between the end of the lead hole 11 and the corresponding solar cell 4 is large, increasing the probability of solar cell 4 cracking during the lamination process of the photovoltaic module 100. Therefore, by setting the distance M1 between the edge of the solar cell 4 facing the lead hole 11 along the first direction and the outer contour line of the lead hole 11, which satisfies the condition that 0mm < M1 ≤ 8mm, M1 is reasonably set. This ensures that the lead 5 can pass through the lead hole 11 while reducing the probability of solar cell 4 cracking during the lamination process of the photovoltaic module 100, thereby effectively improving the production yield of the photovoltaic module 100 and facilitating its long-term normal use.

[0060] According to some embodiments of this utility model, refer to Figure 6 The photovoltaic module 100 also includes a plurality of solar cells 4, which are disposed on one side of the backsheet 1 along a first direction (e.g., Figure 6 (As shown in the left and right directions), there is a gap between the outer contour of the lead hole 11 and the corresponding edge of the battery cell 4 adjacent to the lead hole 11.

[0061] For example, in Figure 3 and Figure 6In the example, multiple solar cells 4 are arranged sequentially and at intervals on the front side of the backsheet 1. Two solar cells 4 are arranged above the lead hole 11, with a gap between the lower edge of the two solar cells 4 and the upper outer contour line of the lead hole 11. Similarly, two solar cells 4 are arranged below the lead hole 11, with a gap between the upper edge of the two solar cells and the lower outer contour line of the lead hole 11. This arrangement prevents the backsheet 1 from cracking during lamination, and also prevents the solar cells 4 from cracking, thereby effectively improving the production yield of the photovoltaic module 100 and extending its service life.

[0062] According to some embodiments of this utility model, refer to Figure 6 The gap is M2, where M2 satisfies: 0mm < M2 ≤ 2mm. For example, in... Figure 6 In the example, taking the solar cell 4 above the lead hole 11 as an example, the distance between the outer contour line of the upper end of the lead hole 11 and the lower edge of the solar cell 4 is M2. When M2 is greater than 2mm, the gap between the lead hole 11 and the solar cell 4 is large, which reduces the length of the first axis 111 of the lead hole 11, increases the difficulty for the lead wire 5 to pass through the lead hole 11, and thus reduces the production efficiency of the photovoltaic module 100. Therefore, by setting the gap M2 to satisfy: 0mm < M2 ≤ 2mm, the gap setting is reasonable, thereby increasing the length of the first axis 111 of the lead hole 11, facilitating the passage of the lead wire 5 through the lead hole 11, improving the assembly efficiency of the lead wire 5 and the backsheet 1, and thus effectively improving the production efficiency of the photovoltaic module 100.

[0063] A photovoltaic power generation system (not shown) according to a third aspect embodiment of the present invention includes a backplane 1 according to the first aspect embodiment of the present invention, or a photovoltaic module 100 according to the second aspect embodiment of the present invention.

[0064] According to the photovoltaic power generation system of this utility model, by adopting the above-mentioned backsheet 1 or photovoltaic modules, the service life of the photovoltaic power generation system is extended and the installation efficiency of the photovoltaic power generation system is improved.

[0065] The backplate 1, photovoltaic module 100, and other components and operations of the photovoltaic power generation system according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0066] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0068] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A backplate, characterized in that, At least one lead hole is formed on the back plate. The outer contour of the lead hole can be divided into four equal curve segments. Each curve segment is formed as a line segment protruding away from the center of the lead hole. The lead hole is a non-circular hole. The maximum distance of the outer contour of the lead hole in a first direction is a, and the maximum distance of the outer contour of the lead hole in a second direction is b. The first direction is perpendicular to the second direction. The relationship between a and b satisfies: 1.1≤b / a≤2.

5.

2. The backplate according to claim 1, characterized in that, The condition 'a' further satisfies: 8mm ≤ a ≤ 18mm; and / or, The b further satisfies: 10mm≤b≤20mm.

3. The backplate according to claim 1, characterized in that, The outer contour lines of the lead hole are symmetrical about the axis of the first direction and the axis of the second direction, respectively.

4. The backplate according to any one of claims 1-3, characterized in that, The back plate is provided with a reflector, which includes a plurality of first reflective segments and a plurality of second reflective segments. The first reflective segments extend along the first direction, and the second reflective segments extend along the second direction. The end of the first reflective segment adjacent to the lead hole is spaced apart from the lead hole, and the end of the second reflective segment adjacent to the lead hole is spaced apart from the lead hole.

5. The backplate according to claim 4, characterized in that, The distance between the end of the first reflective segment adjacent to the lead hole and the outer contour line of the lead hole is L1, wherein L1 satisfies: 20mm ≤ L1 ≤ 70mm; and / or, The distance between the end of the second reflective segment near the lead hole and the outer contour line of the lead hole is L2, wherein L2 satisfies: 55mm≤L2≤105mm.

6. A photovoltaic module, characterized in that, include: A backsheet has at least one lead hole formed on it. The outer contour of the lead hole can be divided into four equal curve segments. The lead hole is not a perfect circle. The lead hole has a first axis and a second axis. The first axis is parallel to the long side of the photovoltaic module, and the second axis is parallel to the short side of the photovoltaic module. The first axis is perpendicular to the second axis. The maximum distance of the outer contour of the lead hole in the direction of the first axis is 'a'. The length of the long side of the photovoltaic module is 'w1'. Wherein, 'a' and 'w1' satisfy: 0.003 ≤ a / w1 ≤ 0.03; and / or... The maximum distance between the outer contour line of the lead hole and the direction of the second axis is b, and the length of the short side of the photovoltaic module on the second axis is w2, wherein b and w2 satisfy: 0.007≤b / w2≤0.

03.

7. The photovoltaic module according to claim 6, characterized in that, Also includes: Multiple battery cells are disposed on one side of the back plate, and the orthographic projection of the battery cell adjacent to the lead hole on the back plate along the first axis in the first direction overlaps with a portion of the lead hole.

8. The photovoltaic module according to claim 7, characterized in that, The distance between the edge of the battery cell facing the lead hole and the outer contour line of the lead hole along the first axis and the first direction is M1, wherein M1 satisfies: 0mm < M1 ≤ 8mm.

9. The photovoltaic module according to claim 6, characterized in that, Also includes: Multiple battery cells are disposed on one side of the back plate, and a gap is formed between the outer contour line of the lead hole and the corresponding edge of the battery cell adjacent to the lead hole along a first direction.

10. The photovoltaic module according to claim 9, characterized in that, The gap is M2, wherein M2 satisfies: 0mm < M2 ≤ 2mm.

11. A photovoltaic power generation system, characterized in that, It includes a backsheet according to any one of claims 1-6, or a photovoltaic module according to any one of claims 6-10.

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