Photovoltaic backboard and photovoltaic module
By optimizing the design of the receiving holes and the busbar lead-out structure of the photovoltaic backsheet, the problems of insufficient structural strength and reliability of the photovoltaic backsheet were solved, resulting in higher load-bearing capacity and longer service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-03-20
AI Technical Summary
The lead wire aperture of existing photovoltaic backsheets is too large, which leads to reduced structural strength and insufficient reliability, affecting the load capacity and service life of photovoltaic modules.
The design of the receiving holes in the photovoltaic backsheet was optimized, the hole diameter was reduced to 7.5mm≤φ≤11mm, and chamfers were formed at the edge of the hole diameter. The spacing and arrangement of the holes were optimized, and combined with the appropriate busbar lead-out design, the structural strength and reliability were improved.
It improves the four-point bending strength of the photovoltaic backsheet, reduces the probability of breakage at the receiving hole, extends the service life, enhances the structural strength and load capacity of the photovoltaic module, and improves reliability and production efficiency.
Smart Images
Figure CN224022153U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic technology field especially is related to a photovoltaic backboard and photovoltaic module. BACKGROUND
[0002] In prior art, the aperture of the lead hole of the photovoltaic backboard is mostly 12±1mm, when the photovoltaic backboard is subjected to external force, the rupture probability of the lead hole of the photovoltaic backboard is relatively large, resulting in the reduction of the structural strength of the photovoltaic backboard and the reduction of the reliability of the photovoltaic backboard. SUMMARY
[0003] The utility model aims at at least one of the technical problems existing in prior art. For this reason, one purpose of the utility model is to propose a photovoltaic backboard, which can improve the structural strength and reliability of the photovoltaic backboard.
[0004] The second purpose of the utility model is to propose a photovoltaic module, which can improve the load capacity of the photovoltaic module.
[0005] According to the photovoltaic backboard of the first aspect embodiment of the utility model, the photovoltaic backboard includes: a backboard body, the backboard body is formed with at least one accommodating hole, the accommodating hole is a circular hole, the diameter of the accommodating hole is φ, and the φ satisfies: 7.5mm≤φ≤11mm.
[0006] According to the photovoltaic backboard of the utility model embodiment, by reducing the aperture of the accommodating hole, optimizing the aperture design of the accommodating hole, when the corresponding accommodating hole is set, the busbar lead-out wire can be conveniently arranged while ensuring the four-point bending strength of the photovoltaic backboard, when the photovoltaic backboard is subjected to external force, the rupture probability of the accommodating hole can be effectively reduced, thereby improving the structural strength, stability and consistency of the photovoltaic backboard, prolonging the service life of the photovoltaic backboard, improving the reliability of the photovoltaic backboard, so that the photovoltaic backboard has higher load capacity.
[0007] In some embodiments, the load at the accommodating hole is F, and the F satisfies: F=-0.725×φ+145.58 (MPa).
[0008] In some embodiments, a chamfer is formed on the edge of at least one side of the accommodating hole along the thickness direction of the backboard body, the width of the chamfer is L1, and the L1 satisfies: 0.3mm≤L1≤2mm.
[0009] In some embodiments, the angle of the chamfer is α, and the α satisfies: 30°≤α≤60°.
[0010] In some embodiments, the plurality of accommodating holes are arranged along the width direction of the back plate body, and the distance between two adjacent accommodating holes is L2, wherein 360mm≤L2≤430mm.
[0011] In some embodiments, the distance between the accommodating hole adjacent to the edge of the back plate body and the corresponding side edge of the back plate body is L3, wherein 190mm≤L3≤230mm.
[0012] In some embodiments, the length of the back plate body is L4, wherein 1716mm≤L4≤2459mm; and the width of the back plate body is L5, wherein 1128mm≤L5≤1297mm.
[0013] According to the photovoltaic module of the second aspect of the present application, the photovoltaic module comprises a photovoltaic back plate, a cell string and a bus bar lead-out wire, the photovoltaic back plate comprises a back plate body, at least one accommodating hole is formed in the middle of the back plate body, the diameter of the accommodating hole is φ, wherein 7.5mm≤φ≤11mm; the cell string is arranged on one side of the back plate body along the thickness direction, the cell string comprises a plurality of cell pieces and a solder strip, the solder strip connects the plurality of cell pieces to form the cell string; one end of the bus bar lead-out wire is electrically connected with the solder strip, and the other end of the bus bar lead-out wire penetrates the accommodating hole of the back plate body.
[0014] In some embodiments, the length of the cross section of the bus bar lead-out wire is L6, wherein 4mm≤L6≤7mm; and / or, the width of the cross section of the bus bar lead-out wire is L7, wherein 0.3mm≤L7≤0.5mm.
[0015] In some embodiments, the plurality of bus bar lead-out wires comprise a first lead-out wire and a second lead-out wire, the first lead-out wire and the second lead-out wire are arranged at intervals, and the distance between the first lead-out wire and the second lead-out wire decreases from the side of the back plate body adjacent to the cell string to the side of the back plate body away from the cell string along the thickness direction of the back plate body.
[0016] In some embodiments, the first and second lead-out wires each include a first bent section and a second bent section, the second bent section is arranged at a side of the backsheet body adjacent to the battery string, one end of the second bent section is connected with the solder strip, the other end of the second bent section is connected with one end of the first bent section, the other end of the first bent section extends out from the side of the backsheet body away from the battery string through the accommodating hole; the included angle formed by the first and second bent sections is β, and the β satisfies: 95°≤β≤115°.
[0017] In some embodiments, the distance between the two first bent sections away from the other end of the corresponding second bent section is L8, and the L8 satisfies: 0.5mm≤L8≤1.5mm; the distance between the two first bent sections adjacent to the one end of the corresponding second bent section is L9, and the L9 satisfies: 5.5mm≤L9≤6.5mm.
[0018] In some embodiments, the load of the photovoltaic module is F1, and the F1 satisfies: -4000Pa≤F1≤4200Pa.
[0019] In some embodiments, the load at the accommodating hole is F, and the F satisfies: F=-0.725×φ+145.58 (MPa).
[0020] In some embodiments, a chamfer is formed on the edge of at least one side of the accommodating hole along the thickness direction of the backsheet body, the width of the chamfer is L1, and the L1 satisfies: 0.3mm≤L1≤2mm.
[0021] In some embodiments, the angle of the chamfer is α, and the α satisfies: 30°≤α≤60°.
[0022] In some embodiments, the accommodating hole is a plurality of, the plurality of accommodating holes are arranged at intervals along the width direction of the backsheet body, and the distance between the two adjacent accommodating holes is L2, and the L2 satisfies: 360mm≤L2≤430mm.
[0023] In some embodiments, the distance between the accommodating hole adjacent to the edge of the backsheet body along the width direction of the backsheet body and the corresponding side edge of the backsheet body is L3, and the L3 satisfies: 190mm≤L3≤230mm.
[0024] In some embodiments, the length of the backsheet body is L4, and the L4 satisfies: 1716mm≤L4≤2459mm; the width of the backsheet body is L5, and the L5 satisfies: 1128mm≤L5≤1297mm.
[0025] 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
[0026] 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:
[0027] Figure 1 This is a partial schematic diagram of a photovoltaic module according to an embodiment of the present utility model;
[0028] Figure 2 This is a schematic diagram of the busbar lead wire passing through the receiving hole according to an embodiment of the present utility model;
[0029] Figure 3 This is a schematic diagram of the busbar lead wire according to an embodiment of this utility model;
[0030] Figure 4 This is a scatter plot of theoretical four-point bending data for photovoltaic backsheets with different aperture accommodating holes according to embodiments of this utility model.
[0031] Figure label:
[0032] 100. Photovoltaic modules;
[0033] 10. Back panel body; 11. Receiving hole;
[0034] 20. Battery string; 21. Battery cell;
[0035] 30. Busbar lead-out line; 31. First lead-out line; 32. Second lead-out line; 33. First bend section; 34. Second bend section. Detailed Implementation
[0036] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-4 The photovoltaic backsheet according to an embodiment of the present utility model includes a backsheet body 10.
[0037] Specifically, combined Figure 1 The back plate body 10 has at least one receiving hole 11, which is a circular hole with a diameter of φ, satisfying: 7.5mm≤φ≤11mm.
[0038] The accommodating hole 11 penetrates the backboard body 10 along the thickness direction of the backboard body 10, the projection shape of the accommodating hole 11 on the backboard body 10 along the thickness direction of the backboard body 10 is circular, and the accommodating hole 11 is suitable for threading the busbar lead-out wire 30. When the diameter of the accommodating hole 11 is less than 7.5 mm, it may be inconvenient to thread the busbar lead-out wire 30, and the busbar lead-out wire 30 and the edge of the accommodating hole 11 are abraded with each other; when the diameter of the accommodating hole 11 is greater than 11 mm, part of the glue film inside the photovoltaic module 100 may overflow from the accommodating hole 11, the sealing performance of the photovoltaic module 100 is reduced, the structural strength of the photovoltaic backboard is reduced, and the quality of the formed photovoltaic module 100 is reduced. For example, φ = 8 mm.
[0039] In the embodiment, the accommodating holes 11 with diameters of 8 mm, 10 mm and 12 mm are respectively arranged in the backboard body 10 with the same size of 2272 mm x 1128 mm x 2 mm, and the four-point bending tests of the photovoltaic backboard are respectively performed, and the test results in the same test environment are shown in Table 1 as follows:
[0040] Table 1
[0041]
[0042] It can be seen from the test results in Table 1 that the four-point bending strength of the photovoltaic backboard with the accommodating hole 11 with the diameter of 8 mm is 2.9 Mpa higher than that of the photovoltaic backboard with the accommodating hole with the diameter of 12 mm, and the four-point bending strength of the photovoltaic backboard with the accommodating hole 11 with the diameter of 10 mm is 2.6 Mpa higher than that of the photovoltaic backboard with the accommodating hole with the diameter of 12 mm.
[0043] According to the photovoltaic backboard of the embodiment of the utility model, by reducing the diameter of the accommodating hole 11 and optimizing the diameter design of the accommodating hole 11, the four-point bending strength of the photovoltaic backboard can be ensured while facilitating the threading of the busbar lead-out wire 30 when the corresponding accommodating hole 11 is arranged, the rupture probability at the accommodating hole 11 can be effectively reduced when the photovoltaic backboard is subjected to external force, and therefore the structural strength, stability and consistency of the photovoltaic backboard are improved, the service life of the photovoltaic backboard is prolonged, and the reliability of the photovoltaic backboard is improved, so that the photovoltaic backboard has high load resistance.
[0044] According to some embodiments of the utility model, the load at the accommodating hole 11 is F, F satisfies: F = -0.725 x φ + 145.58 (MPa). When the diameter of the accommodating hole 11 is 8 mm-12 mm, a plurality of different diameter parameters are selected to substitute into the formula to obtain the load of the four-point bending test of the photovoltaic backboard between 136.88 Mpa-139.78 Mpa.
[0045] Specifically, as Figure 4As shown, when the diameter of the accommodating hole 11 is 8mm, the theoretical four-point bending strength of the photovoltaic backboard is 139.78Mpa, and when the diameter of the accommodating hole 11 is 12mm, the theoretical four-point bending strength of the photovoltaic backboard is 136.88Mpa, that is, the smaller the diameter of the accommodating hole 11, the greater the theoretical four-point bending strength of the photovoltaic backboard. Therefore, by reducing the hole diameter of the accommodating hole 11, the four-point bending strength of the photovoltaic backboard can be improved, thereby improving the structural strength of the photovoltaic backboard and ensuring that the bus bar lead-out wire 30 can be normally provided while avoiding overflow of glue.
[0046] According to some embodiments of the present application, the edge of at least one side of the accommodating hole 11 along the thickness direction of the backboard body 10 is chamfered, and the width of the chamfer is L1, which satisfies: 0.3mm≤L1≤2mm.
[0047] By grinding the edge of at least one side of the accommodating hole 11 along the thickness direction of the backboard body 10, the cracks at the right angles are removed and the chamfer is ground, and the length of the chamfer along the thickness direction of the backboard body 10 is L1. When the width of the chamfer is less than 0.3mm, the width of the chamfer is small, and the cracks at the right angles are not easy to remove, or the chamfer is easy to form stress concentration, which affects the quality of the photovoltaic backboard; when the width of the chamfer is greater than 2mm, the width of the chamfer is large, and the processing difficulty is large, which may affect the diameter of the accommodating hole 11 and the structural strength of the photovoltaic backboard at the accommodating hole 11. For example, L1=1mm.
[0048] Therefore, by forming a chamfer on the edge of at least one side of the accommodating hole 11 along the thickness direction of the backboard body 10 and limiting the width range of the chamfer, the four-point bending strength of the photovoltaic backboard can be further improved without affecting the diameter of the accommodating hole 11, thereby improving the structural strength and reliability of the photovoltaic backboard.
[0049] In this embodiment, the accommodating holes 11 of different types of photovoltaic backboards are chamfered and not chamfered, and the four-point bending tests of the photovoltaic backboards are performed, and the test results are shown in Table 2 under the same test environment.
[0050] Table 2
[0051]
[0052] From the test results in Table 2 above, it can be seen that the average four-point bending strength of the photovoltaic backboard with chamfering is higher than that of the photovoltaic backboard without chamfering. Preferably, the float hole punching semi-tempered glass backboard.
[0053] According to some embodiments of the present application, the angle of the chamfer is α, and α satisfies: 30°≤α≤60°.
[0054] When the angle of the chamfer is less than 30°, the angle of the chamfer is too small, which can cause that the cracks at the right angle of the edge of the accommodating hole 11 cannot be completely polished, and the edge of the accommodating hole 11 is not smooth; when the angle of the chamfer is greater than 60°, the angle of the chamfer is too large, which can cause that the diameter of the accommodating hole 11 is increased, and the structural strength of the photovoltaic backboard is reduced. For example, α = 45°.
[0055] Therefore, by limiting the angle range of the chamfer, it can be ensured that the edge of the accommodating hole 11 is smooth and has no obvious cracks, the machining precision of the accommodating hole 11 is improved, and meanwhile, the diameter of the accommodating hole 11 is prevented from being increased, the four-point bending strength of the photovoltaic backboard is improved, and thus the structural strength and reliability of the photovoltaic backboard are improved.
[0056] According to some embodiments of the present application, as shown in Figure 1 the accommodating holes 11 are a plurality of holes, the plurality of accommodating holes 11 are arranged at intervals along the width direction of the backboard body 10, and the distance between the two adjacent accommodating holes 11 is L2, and L2 satisfies: 360mm≤L2≤430mm.
[0057] When the distance between the two adjacent accommodating holes 11 is less than 360mm, the distance between the two adjacent accommodating holes 11 is too small, which causes that the positions of the plurality of accommodating holes 11 on the backboard body 10 are relatively concentrated, and when the backboard body 10 is laminated, stress concentration can occur, and the structural strength and reliability of the backboard body 10 are low. For example, L2 = 400mm.
[0058] In the embodiment, the number of the accommodating holes 11 includes but is not limited to three, which is not limited here and can be adjusted according to different sizes of the photovoltaic backboard.
[0059] Therefore, by limiting the distance range between the two adjacent accommodating holes 11 and optimizing the arrangement of the plurality of limiting holes, the stress of the backboard body 10 can be uniform when the backboard body 10 is laminated, the stress concentration can be avoided, the structural strength and reliability of the photovoltaic backboard are effectively improved, and the service life of the photovoltaic backboard is prolonged.
[0060] According to some embodiments of the present application, as shown in Figure 1 the distance between the accommodating hole 11 adjacent to the edge of the backboard body 10 along the width direction of the backboard body 10 and the corresponding side edge of the backboard body 10 is L3, and L3 satisfies: 190mm≤L3≤230mm.
[0061] When the distance between the accommodating hole 11 adjacent to the edge of the back plate body 10 in the width direction of the back plate body 10 and the corresponding side edge of the back plate body 10 is less than 190 mm, the distance between the accommodating hole 11 adjacent to the edge of the back plate body 10 in the width direction of the back plate body 10 and the corresponding side edge of the back plate body 10 is too small, stress concentration is prone to occur at the edge of the back plate body 10 during lamination, and the structural strength of the back plate body 10 is reduced; when the distance between the accommodating hole 11 adjacent to the edge of the back plate body 10 in the width direction of the back plate body 10 and the corresponding side edge of the back plate body 10 is greater than 230 mm, the distance between the accommodating hole 11 adjacent to the edge of the back plate body 10 in the width direction of the back plate body 10 and the corresponding side edge of the back plate body 10 is too large, stress concentration is prone to occur in the middle region of the back plate body 10 during lamination, and the structural strength of the back plate body 10 is reduced. For example, L3 = 200 mm.
[0062] Therefore, by limiting the distance range between the accommodating hole 11 adjacent to the edge of the back plate body 10 in the width direction of the back plate body 10 and the corresponding side edge of the back plate body 10, the arrangement of the plurality of accommodating holes 11 is optimized, stress concentration is avoided in the middle region and the edge of the back plate body 10 during lamination, and the structural strength and reliability of the photovoltaic back plate are further improved.
[0063] According to some embodiments of the present application, as shown in Figure 1 The length of the back plate body 10 is L4, and L4 satisfies: 1716 mm≤L4≤2459 mm; and the width of the back plate body 10 is L5, and L5 satisfies: 1128 mm≤L5≤1297 mm.
[0064] The minimum value of the length of the back plate body 10 can be 1716 mm, the maximum value of the length of the back plate body 10 can be 2459 mm, the minimum value of the width of the back plate body 10 can be 1128 mm, and the maximum value of the width of the back plate body 10 can be 1297 mm.
[0065] In the embodiment, taking a photovoltaic back plate with a version of 2378 mm x 1297 mm x 2 mm as an example, the plurality of accommodating holes 11 of the photovoltaic back plate are respectively subjected to chamfering treatment and non-chamfering treatment, and four-point bending tests of the photovoltaic back plate are respectively performed. Under the same test environment, the test results are shown in Table 3 as follows:
[0066] Table 3
[0067]
[0068] From the test results in Table 3 above, it can be seen that the maximum value of the four-point bending strength of the photovoltaic backboard with chamfering treatment is 149.725 Mpa, and the minimum value is 132.557 Mpa; the maximum value of the four-point bending strength of the photovoltaic backboard without chamfering treatment is 139.653 Mpa, and the minimum value is 124.685 Mpa. The average four-point bending strength of the photovoltaic backboard with chamfering treatment is higher than that of the photovoltaic backboard without chamfering treatment.
[0069] According to the photovoltaic module 100 of the second aspect of the present application, as shown in Figure 1 and Figure 2 The photovoltaic module 100 includes a photovoltaic backboard, a cell string 20, and a bus bar lead-out wire 30. The photovoltaic backboard includes a backboard body 10. At least one accommodating hole 11 is formed in the middle of the backboard body 10. The diameter of the accommodating hole 11 is φ, and φ satisfies: 7.5mm≤φ≤11mm. The cell string 20 is arranged on one side of the backboard body 10 along the thickness direction. The cell string 20 includes a plurality of cell pieces 21 and a solder strip. The solder strip connects the plurality of cell pieces 21 to form the cell string 20. One end of the bus bar lead-out wire 30 is electrically connected with the solder strip. The other end of the bus bar lead-out wire 30 penetrates the accommodating hole 11 of the backboard body 10.
[0070] The accommodating hole 11 penetrates the backboard body 10 along the thickness direction of the backboard body 10. In this application, in order to facilitate the penetration of the bus bar lead-out wire 30 through the accommodating hole 11 formed in the backboard body 10, while ensuring the structural strength of the backboard body 10, the minimum value of the diameter of the accommodating hole 11 is 7.5mm, and the maximum value of the diameter of the accommodating hole 11 is 11mm. The plurality of cell strings 20 extend along the length direction of the backboard body 10 and are arranged in sequence along the width direction of the backboard body 10. Each cell string 20 includes a plurality of cell pieces 21 arranged in sequence along the length direction of the backboard body 10 and a solder strip extending along the length direction of the backboard body 10 to connect the plurality of cell pieces 21. One end of the bus bar lead-out wire 30 is connected with the solder strip to collect the current on the solder strip. The other end of the bus bar lead-out wire 30 penetrates the accommodating hole 11 of the backboard body 10 to lead out the collected current.
[0071] According to the photovoltaic module 100 of the present application, by forming the accommodating hole 11 with a reduced aperture on the photovoltaic backboard, optimizing the aperture of the accommodating hole 11, and arranging the cell string 20 on one side of the backboard body 10 along the thickness direction, the bus bar lead-out wire 30 can collect the current of the cell string 20 and lead out the current through the accommodating hole 11. The four-point bending strength of the photovoltaic backboard can be improved. When the photovoltaic module 100 is laminated, the probability of rupture at the accommodating hole 11 can be effectively reduced, thereby improving the overall structural strength and load capacity of the photovoltaic module 100, prolonging the service life of the photovoltaic module 100, and improving the stability and reliability of the photovoltaic module 100.
[0072] According to some embodiments of the present application, as shown in Figure 2 The length of the cross section of the busbar outgoing line 30 is L6, and L6 satisfies: 4mm≤L6≤7mm.
[0073] When the length of the cross section of the busbar outgoing line 30 is less than 4mm, the length of the cross section of the busbar outgoing line 30 is small, the resistance of the busbar outgoing line 30 is large, and the current transmission efficiency of the busbar outgoing line 30 is low; when the length of the cross section of the busbar outgoing line 30 is greater than 7mm, the length of the cross section of the busbar outgoing line 30 is large, and it is not convenient for the busbar outgoing line 30 to pass through the accommodating hole 11, which may cause the busbar outgoing line 30 to rub against the edge of the accommodating hole 11 when passing through the accommodating hole 11. For example, L6=5mm.
[0074] Therefore, by limiting the length range of the cross section of the busbar outgoing line 30, the current transmission efficiency of the busbar outgoing line 30 is maximized, and at the same time, the busbar outgoing line 30 can conveniently pass through the accommodating hole 11, thereby improving the operation efficiency.
[0075] Optionally, as shown in Figure 2 The width of the cross section of the busbar outgoing line 30 is L7, and L7 satisfies: 0.3mm≤L7≤0.5mm.
[0076] When the width of the cross section of the busbar outgoing line 30 is less than 0.3mm, the width of the cross section of the busbar outgoing line 30 is small, the resistance of the busbar outgoing line 30 is large, and the output power of the photovoltaic module 100 may be reduced. For example, L7=0.4mm.
[0077] Optionally, the length of the cross section of the busbar outgoing line 30 is L6, and L6 satisfies: 4mm≤L6≤7mm, and at the same time, the width of the cross section of the busbar outgoing line 30 is L7, and L7 satisfies: 0.3mm≤L7≤0.5mm.
[0078] In this embodiment, the accommodating hole 11 with a 10mm aperture is suitable for matching the size of the busbar outgoing line 30 of 6mm×0.3mm, and the accommodating hole 11 with an 8mm aperture is suitable for matching the size of the busbar outgoing line 30 of 5mm×0.35mm or 5mm×0.3mm. Therefore, by designing the accommodating hole 11 with different apertures to match the busbar outgoing line 30 with different sizes, the load capacity of the photovoltaic module 100 is improved, at the same time, the busbar outgoing line 30 can conveniently pass through the accommodating hole 11, thereby improving the production efficiency of the photovoltaic module 100, and ensuring the feasibility of batch production of the photovoltaic backboard.
[0079] According to some embodiments of the present application, as shown in Figure 3As shown in the drawings, the busbar lead-out wire 30 is multiple, the multiple busbar lead-out wires 30 include a first lead-out wire 31 and a second lead-out wire 32, the first lead-out wire 31 and the second lead-out wire 32 are arranged at intervals, and the distance between the first lead-out wire 31 and the second lead-out wire 32 gradually decreases from the side of the back plate body 10 adjacent to the battery string 20 to the side away from the battery string 20 along the thickness direction of the back plate body 10.
[0080] In the embodiment, the current collected on the welding strip is led out through the busbar, the current on the busbar is led out through the busbar lead-out wire 30, the busbar is multiple, the multiple busbars include a first busbar and a second busbar, the first busbar and the second busbar are respectively used for collecting the current on the adjacent two battery strings 20, for example, one end of the first lead-out wire 31 is connected with the first busbar, and the other end penetrates through the adjacent accommodating hole 11, one end of the second lead-out wire 32 is connected with the second busbar, and the other end penetrates through the adjacent accommodating hole 11, one end of the first lead-out wire 31 and one end of the second lead-out wire 32 are arranged at intervals along the width direction of the back plate body 10, and the other end of the first lead-out wire 31 and the other end of the second lead-out wire 32 extend towards the adjacent same accommodating hole 11 and penetrate through the accommodating hole 11, and the distance between the other end of the first lead-out wire 31 and the other end of the second lead-out wire 32 gradually decreases from the side of the back plate body 10 adjacent to the battery string 20 to the side away from the battery string 20 along the thickness direction of the back plate body 10.
[0081] Therefore, through the arrangement of the first lead-out wire 31 and the second lead-out wire 32, the first lead-out wire 31 and the second lead-out wire 32 can be conveniently penetrated through the accommodating hole 11, and the penetration efficiency of the busbar lead-out wire 30 is improved.
[0082] According to some embodiments of the utility model, as Figure 3 As shown in the drawings, the first lead-out wire 31 and the second lead-out wire 32 both include a first bending section 33 and a second bending section 34, the second bending section 34 is arranged at the side of the back plate body 10 adjacent to the battery string 20, one end of the second bending section 34 is connected with the welding strip, the other end of the second bending section 34 is connected with one end of the first bending section 33, and the other end of the first bending section 33 penetrates through the accommodating hole 11 and extends out from the side of the back plate body 10 away from the battery string 20; the included angle formed by the first bending section 33 and the second bending section 34 is β, and β satisfies: 95°≤β≤115°.
[0083] Taking the first lead-out wire 31 as an example, one end of the second bending section 34 is connected with the solder strip through the first bus bar, the other end of the second bending section 34 extends along the width direction of the back plate body 10 towards the direction of the adjacent accommodating hole 11 and is connected with one end of the first bending section 33, one end of the first bending section 33 is arranged in the accommodating hole 11, and the other end of the first bending section 33 penetrates the accommodating hole 11 along the thickness direction of the back plate body 10 from the side of the back plate body 10 adjacent to the battery string 20 to the side away from the battery string 20 and is obliquely extended out.
[0084] When the included angle formed by the first bending section 33 and the second bending section 34 is less than 95°, the included angle formed by the first bending section 33 and the second bending section 34 is smaller, and it may be inconvenient for the first bending section 33 to penetrate the accommodating hole 11; when the included angle formed by the first bending section 33 and the second bending section 34 is greater than 115°, the included angle formed by the first bending section 33 and the second bending section 34 is larger, and it may cause the first bending section 33 of the first lead-out wire 31 and the second lead-out wire 32 to interfere and easily short circuit. For example, β = 100°.
[0085] Therefore, by limiting the included angle range formed by the first bending section 33 and the second bending section 34, the processing precision of the first lead-out wire 31 and the second lead-out wire 32 can be improved, at the same time, it is convenient for the first bending section 33 of the first lead-out wire 31 and the second lead-out wire 32 to penetrate the accommodating hole 11, the first bending section 33 of the first lead-out wire 31 and the second lead-out wire 32 is avoided to interfere, the short circuit condition is avoided, and the safety and reliability of the photovoltaic module 100 are improved.
[0086] According to some embodiments of the utility model, as shown in Figure 3 The distance between the other ends of the two first bending sections 33 away from the corresponding second bending sections 34 is L8, and L8 satisfies: 0.5mm≤L8≤1.5mm; the distance between the two first bending sections 33 adjacent to one end of the corresponding second bending sections 34 is L9, and L9 satisfies: 5.5mm≤L9≤6.5mm.
[0087] When the distance between the other ends of the two first bending sections 33 away from the corresponding second bending sections 34 is less than 0.5mm, the distance between the other ends of the two first bending sections 33 away from the corresponding second bending sections 34 is smaller, which may cause the two first bending sections 33 of the first lead-out wire 31 and the second lead-out wire 32 away from one end of the second bending section 34 to interfere and easily short circuit. For example, L8 = 1mm.
[0088] When the distance between the two first bending sections 33 adjacent to one end of the corresponding second bending section 34 is less than 5.5 mm, the distance between the two first bending sections 33 adjacent to one end of the corresponding second bending section 34 is small, which can cause the two first bending sections 33 of the first lead-out wire 31 and the second lead-out wire 32 to interfere with one end of the second bending section 34, easily causing a short circuit, and the safety of the photovoltaic module 100 is reduced; when the distance between the two first bending sections 33 adjacent to one end of the corresponding second bending section 34 is greater than 6.5 mm, the distance between the two first bending sections 33 adjacent to one end of the corresponding second bending section 34 is large, which is not convenient for the two first bending sections 33 to pass through the accommodation hole 11. For example, L9=6 mm.
[0089] Therefore, by limiting the distance range between the two first bending sections 33 away from the other end of the corresponding second bending section 34, and limiting the distance range between the two first bending sections 33 adjacent to one end of the corresponding second bending section 34, the interference between the two first bending sections 33 of the first lead-out wire 31 and the second lead-out wire 32 and one end of the second bending section 34 can be avoided, the short circuit can be avoided, and the safety and reliability of the photovoltaic module 100 can be effectively improved. At the same time, it is convenient for the two first bending sections 33 to pass through the accommodation hole 11, and the production efficiency of the photovoltaic module 100 is improved.
[0090] In the embodiment, the photovoltaic module 100 further comprises a guide sleeve, the guide sleeve is sleeved on the two first bending sections 33 away from one end of the second bending section 34 along the thickness direction of the back plate body 10, and the on-line verification is performed on the plurality of back plate bodies 10 formed with the accommodation hole 11 with a hole diameter of 10 mm. The hole entry rate of the bus bar lead-out wire 30 sleeved with the guide sleeve is shown in Table 4 as follows: Table 4
[0091]
[0092] From the test results in Table 4, it can be seen that the hole entry rate of the bus bar lead-out wire 30 in the present application is 99.67%, and in the prior art, the hole entry rate of the accommodation hole with a hole diameter of 12 mm is 99.64%, and the hole entry rate is improved by 0.03%. Therefore, by reducing the hole diameter of the accommodation hole 11 and setting the guide sleeve, the hole entry rate of the bus bar lead-out wire 30 can be effectively improved.
[0093] According to some embodiments of the present application, the load of the photovoltaic module 100 is F1, and F1 satisfies: -4000Pa≤F1≤4200Pa.
[0094] In the embodiment, the photovoltaic module 100 with the photovoltaic backboard version of 2378mm*1297mm*2mm and 2272mm*1128mm*2mm is taken as an example, the containing hole 11 with the aperture of 10mm is formed on the photovoltaic backboard with the version of 2378mm*1297mm*2mm, the containing hole 11 with the aperture of 8mm and 10mm is respectively formed on the photovoltaic backboard with the version of 2272mm*1128mm*2mm, and the NT400 module four-point bending test is respectively carried out on the photovoltaic module 100, and the test results under the same test environment are shown in the following table 5.
[0095] Table 5
[0096]
[0097] From the test results in the above table 5, it can be seen that the four-point bending strength maximum of the photovoltaic module 100 is 4200Pa, and the minimum is -4000Pa when the containing hole 11 with the aperture of 8mm is formed on the photovoltaic backboard with the version of 2272mm*1128mm*2mm.
[0098] In the embodiment, the size of the busbar lead-out wire 30 is taken as 6mm*0.3mm, the photovoltaic module with the conventional aperture, i.e., 12mm, and the photovoltaic module 100 with the containing hole 11 with the aperture of 8mm and 10mm are respectively subjected to the NT400 module load test, and the test results under the same test environment are shown in the following table 6.
[0099] Table 6
[0100]
[0101] From the test results in the above table 6, it can be seen that the NT400 module four-point bending qualified rate of the photovoltaic module 100 with the containing hole 11 with the aperture of 8mm and 10mm is improved from 55.26% to 100%, the reliability of the photovoltaic module 100 is effectively improved, and the burst rate of the photovoltaic module 100 is reduced.
[0102] According to some embodiments of the utility model, the load at the containing hole 11 is F, and F satisfies: F=-0.725*phi+145.58 (MPa).
[0103] According to the above formula, when the diameter of the accommodating hole 11 is 8mm, the theoretical four-point bending strength of the photovoltaic backboard is 139.78Mpa, and when the diameter of the accommodating hole 11 is 12mm, the theoretical four-point bending strength of the photovoltaic backboard is 136.88Mpa, that is, the smaller the diameter of the accommodating hole 11, the greater the theoretical four-point bending strength of the photovoltaic backboard. Therefore, by reducing the hole diameter of the accommodating hole 11, the four-point bending strength of the photovoltaic backboard can be improved, thereby improving the structural strength and reliability of the photovoltaic module 100.
[0104] According to some embodiments of the present application, the edge of the accommodating hole 11 on at least one side of the backboard body 10 in the thickness direction of the backboard body 10 is formed with a chamfer, and the width of the chamfer is L1, which satisfies: 0.3mm≤L1≤2mm.
[0105] Therefore, by forming a chamfer on the edge of the accommodating hole 11 on at least one side of the backboard body 10 in the thickness direction of the backboard body 10 and limiting the width range of the chamfer, the four-point bending strength of the photovoltaic backboard can be further improved without affecting the diameter of the accommodating hole 11, thereby improving the structural strength and reliability of the photovoltaic module 100.
[0106] According to some embodiments of the present application, the angle of the chamfer is α, which satisfies: 30°≤α≤60°.
[0107] Therefore, by limiting the angle range of the chamfer, the edge of the accommodating hole 11 can be smooth and free of obvious cracks, improving the processing precision of the accommodating hole 11, while avoiding the diameter of the accommodating hole 11 from becoming larger, improving the four-point bending strength of the photovoltaic backboard, and thereby improving the structural strength and reliability of the photovoltaic module 100.
[0108] According to some embodiments of the present application, as shown in Figure 1 the accommodating hole 11 is a plurality of accommodating holes 11, and the plurality of accommodating holes 11 are arranged at intervals along the width direction of the backboard body 10, and the distance between the two adjacent accommodating holes 11 is L2, which satisfies: 360mm≤L2≤430mm.
[0109] Therefore, by limiting the distance range between the two adjacent accommodating holes 11 and optimizing the arrangement of the plurality of limiting holes, the backboard body 10 can be uniformly stressed when laminated, avoiding stress concentration, effectively improving the structural strength and reliability of the photovoltaic module 100, and prolonging the service life of the photovoltaic module 100.
[0110] According to some embodiments of the present application, as shown in Figure 1 the distance between the accommodating hole 11 adjacent to the edge of the backboard body 10 in the width direction of the backboard body 10 and the corresponding side edge of the backboard body 10 is L3, which satisfies: 190mm≤L3≤230mm.
[0111] Therefore, by limiting the distance range of the accommodating hole 11 adjacent to the edge of the back plate body 10 along the width direction of the back plate body 10 and the corresponding side edge of the back plate body 10, the arrangement of the plurality of accommodating holes 11 is optimized, and stress concentration can be avoided in the middle region and the edge of the back plate body 10 during lamination, thereby further improving the structural strength and reliability of the photovoltaic back plate.
[0112] According to some embodiments of the present application, as shown in Figure 1 The length of the back plate body 10 is L4, and L4 satisfies: 1716mm≤L4≤2459mm; and the width of the back plate body 10 is L5, and L5 satisfies: 1128mm≤L5≤1297mm.
[0113] The specific size of the back plate body 10 can be adjusted according to the needs of the photovoltaic module 100, by limiting the length range of the back plate body 10 and limiting the width range of the back plate body 10, and forming the accommodating hole 11 with a reduced aperture on the back plate body 10, the reliability of the photovoltaic module 100 can be effectively improved, and the load capacity of the photovoltaic module 100 can be improved.
[0114] In the description of the present application, it should be understood that the orientations or positional relationships indicated by 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" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0115] In the description of the present application, "first feature" and "second feature" can include one or more features. In the description of the present application, "multiple" means two or more. In the description of the present application, "above" or "below" of the first feature to the second feature can include direct contact of the first and second features, or can include indirect contact of the first and second features through another feature therebetween. In the description of the present application, "above", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.
[0116] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example.
[0117] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A photovoltaic backsheet, characterized in that, include: The backplate body has at least one receiving hole, which is circular and has a diameter of φ, wherein φ satisfies: 7.5mm≤φ≤11mm.
2. The photovoltaic backsheet according to claim 1, characterized in that, The load at the receiving hole is F, which satisfies: F = -0.725 × φ + 145.58 (MPa).
3. The photovoltaic backsheet according to claim 1, characterized in that, The receiving hole has a chamfer on at least one side of its edge along the thickness direction of the back plate body, and the width of the chamfer is L1, wherein L1 satisfies: 0.3mm≤L1≤2mm.
4. The photovoltaic backsheet according to claim 3, characterized in that, The chamfer angle is α, and α satisfies: 30°≤α≤60°.
5. The photovoltaic backsheet according to claim 1, characterized in that, There are multiple receiving holes, which are spaced apart along the width direction of the back plate body. The distance between two adjacent receiving holes is L2, and L2 satisfies: 360mm≤L2≤430mm.
6. The photovoltaic backsheet according to claim 1, characterized in that, The distance between the receiving hole adjacent to the edge of the back plate body along the width direction of the back plate body and the corresponding side edge of the back plate body is L3, and L3 satisfies: 190mm≤L3≤230mm.
7. The photovoltaic backsheet according to claim 1, characterized in that, The length of the backplate body is L4, and L4 satisfies: 1716mm≤L4≤2459mm; The width of the back panel body is L5, and L5 satisfies: 1128mm≤L5≤1297mm.
8. A photovoltaic module, characterized in that, include: A photovoltaic backsheet, comprising a backsheet body, wherein at least one receiving hole is formed in the middle of the backsheet body, the diameter of the receiving hole being φ, wherein φ satisfies: 7.5mm≤φ≤11mm; A battery string, wherein the battery string is disposed on one side of the backplate body along the thickness direction, the battery string includes multiple battery cells and solder strips, and the solder strips connect the multiple battery cells to form the battery string; The busbar lead wire has one end electrically connected to the welding strip, and the other end of the busbar lead wire passes through the receiving hole of the back plate body.
9. The photovoltaic module according to claim 8, characterized in that, The cross-sectional length of the busbar lead wire is L6, and L6 satisfies: 4mm ≤ L6 ≤ 7mm; and / or, The width of the cross-section of the busbar lead wire is L7, and L7 satisfies: 0.3mm≤L7≤0.5mm.
10. The photovoltaic module according to claim 8, characterized in that, The busbar leads are multiple, including a first lead and a second lead. The first lead and the second lead are spaced apart, and the distance between the first lead and the second lead decreases along the thickness direction of the backplate body from the side of the backplate body adjacent to the battery string to the side away from the battery string.
11. The photovoltaic module according to claim 10, characterized in that, Both the first lead and the second lead include a first bent section and a second bent section. The second bent section is located on the side of the backplate body adjacent to the battery string. One end of the second bent section is connected to the solder strip, and the other end of the second bent section is connected to one end of the first bent section. The other end of the first bent section passes through the receiving hole and extends from the side of the backplate body away from the battery string. The included angle formed by the first bending segment and the second bending segment is β, and β satisfies: 95°≤β≤115°.
12. The photovoltaic module according to claim 11, characterized in that, The distance between the other ends of the two first bend segments away from the corresponding second bend segments is L8, where L8 satisfies: 0.5mm ≤ L8 ≤ 1.5mm; The distance between one end of the second bend corresponding to two adjacent first bend segments is L9, where L9 satisfies: 5.5mm≤L9≤6.5mm.
13. The photovoltaic module according to claim 8, characterized in that, The load on the photovoltaic module is F1, which satisfies: -4000Pa≤F1≤4200Pa.
14. The photovoltaic module according to claim 8, characterized in that, The load at the receiving hole is F, which satisfies: F = -0.725 × φ + 145.58 (MPa).
15. The photovoltaic module according to claim 8, characterized in that, The receiving hole has a chamfer on at least one side of its edge along the thickness direction of the back plate body, and the width of the chamfer is L1, wherein L1 satisfies: 0.3mm≤L1≤2mm.
16. The photovoltaic module according to claim 15, characterized in that, The chamfer angle is α, and α satisfies: 30°≤α≤60°.
17. The photovoltaic module according to claim 8, characterized in that, There are multiple receiving holes, which are spaced apart along the width direction of the back plate body. The distance between two adjacent receiving holes is L2, and L2 satisfies: 360mm≤L2≤430mm.
18. The photovoltaic module according to claim 8, characterized in that, The distance between the receiving hole adjacent to the edge of the back plate body along the width direction of the back plate body and the corresponding side edge of the back plate body is L3, and L3 satisfies: 190mm≤L3≤230mm.
19. The photovoltaic module according to claim 8, characterized in that, The length of the backplate body is L4, and L4 satisfies: 1716mm≤L4≤2459mm; The width of the back panel body is L5, and L5 satisfies: 1128mm≤L5≤1297mm.