Photovoltaic module

Abstract

The invention discloses a photovoltaic module. The photovoltaic module comprises a battery unit group and a connecting structure, the battery unit group comprises a plurality of battery strings which are connected in series and / or in parallel; the connection structure comprises a bypass strip, the bypass strip is arranged between adjacent battery unit groups, the bypass strip comprises a first non-lead-out part, a second non-lead-out part and a lead-out part, the lead-out part is connected between the first non-lead-out part and the second non-lead-out part, and the lead-out part extends in the direction away from the first non-lead-out part and the second non-lead-out part. The lead-out part, the first non-lead-out part and the second non-lead-out part are integrally formed. Therefore, the leading-out part is formed on at least part of the bypass strip, the structure of the bypass strip is simplified, compared with the design of multiple leading-out ends of the bypass strip, the welding procedure can be reduced through one leading-out end, and the installation difficulty can be reduced when the leading-out part is connected with the junction box. And meanwhile, the bypass strip is integrally formed, so that the thickness of the non-lead-out part is prevented from being increased, and the risk of cracking the battery pieces on the battery string is effectively reduced.

Description

Technical Field

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

[0002] In existing technologies, photovoltaic modules typically use four leads to bring out one end of the middle busbar and jumper wire near the junction box from the through hole and connect it to the diode inside the junction box. The connection of multiple leads to the junction box requires multiple soldering processes, which are complex and the reliability of the soldering cannot be guaranteed. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a photovoltaic module.

[0004] A photovoltaic module according to an embodiment of the present invention includes: a battery cell group and a connection structure. The battery cell group extends along a first direction and is arranged along a second direction, including a plurality of battery strings connected in series and / or in parallel. The first direction and the second direction are different. The connection structure includes a bypass strip disposed between adjacent battery cell groups. The bypass strip includes a first non-lead-out portion, a second non-lead-out portion, and a lead-out portion. The lead-out portion is connected between the first non-lead-out portion and the second non-lead-out portion. The lead-out portion extends in a direction away from the first non-lead-out portion and the second non-lead-out portion. The lead-out portion and the first non-lead-out portion and the second non-lead-out portion are integrally formed.

[0005] According to the photovoltaic module of the present invention, a complete bypass strip is provided between adjacent parallel battery cell groups. By forming at least a partial lead-out portion in the bypass strip, the middle portion of the bypass strip is formed as the lead-out portion, simplifying the structure of the bypass strip. Compared with multiple lead-out ends of the bypass strip, the single lead-out end design of this application reduces the welding process and the volume of the lead-out portion of the bypass strip, which is beneficial to reducing the installation difficulty when connecting the lead-out portion to the junction box and improving the automation level of the installation of the lead-out portion and the junction box. At the same time, since the lead-out portion is part of the bypass strip and integrally formed with the bypass strip, the thickness of the non-lead-out portion is avoided, effectively reducing the risk of cell cracking on the battery string.

[0006] In some embodiments, the lead-out portion includes: a first lead-out portion and a second lead-out portion, one end of the first lead-out portion being connected to one end of the first non-lead-out portion adjacent to the second non-lead-out portion, and the other end of the first lead-out portion extending out of the first non-lead-out portion; one end of the second lead-out portion being connected to one end of the second non-lead-out portion adjacent to the first non-lead-out portion, and the other end of the second lead-out portion extending out of the second non-lead-out portion, and the other end of the second lead-out portion being connected to the other end of the first lead-out portion.

[0007] In some embodiments, the surfaces of the second lead-out portion and the first lead-out portion that are opposite to each other are in contact.

[0008] In some embodiments, the bypass strip has a first bending area, a second bending area, and a third bending area, wherein the first bending area is located at the junction of the first lead-out portion and the first non-lead-out portion, the second bending area is located at the junction of the second lead-out portion and the second non-lead-out portion, and the third bending area is located at the junction of the first lead-out portion and the second lead-out portion.

[0009] In some embodiments, the lead-out portion is formed by bending a portion of the bypass strip, wherein a first bending area and a second bending area are formed on the bypass strip, and a third bending area is formed on the lead-out portion.

[0010] In some embodiments, the thickness of the bypass strip is t, wherein t satisfies: 0.1mm≤t≤0.2mm.

[0011] In some embodiments, the battery cell pack has a back plate on one side along a third direction, and a through hole is formed on the back plate. The lead-out portion extends out of the through hole in the third direction, and the third direction is orthogonal to the first direction and the second direction. The shortest distance between the lead-out portion and the through hole in the first direction is L1, and the shortest distance between the lead-out portion and the through hole in the first direction is L2. The L1 and L2 satisfy: 2mm≤L1≤8mm, and / or 8mm≤L2≤14mm.

[0012] In some embodiments, the connection structure further includes a busbar, which includes a first busbar portion and a second busbar portion. One end of the first busbar portion has a first busbar outlet portion, and one end of the second busbar portion has a second busbar outlet portion. The first busbar outlet portion and the second busbar outlet portion are respectively located on both sides of the outlet portion in the width direction. The minimum distance between the first bus outlet and the outlet is L 31 The minimum distance between the second bus outlet and the outlet is L. 32 , wherein, the L 31 L 32 Each satisfies: 3mm≤L 31 ≤12mm, and / or, 3mm≤L 32 ≤12mm.

[0013] In some embodiments, the length of the first bus outlet is L. 41 The length L of the second bus outlet 42 , wherein, the L 41 L 42Each satisfies: 15mm≤L 41 ≤25mm, and / or, 15mm≤L 42 ≤25mm.

[0014] In some embodiments, the first bus outlet and the second bus outlet are disposed opposite to each other along a second direction, the first bus outlet, the second bus outlet and the outlet extend out of the through hole in a direction away from the back plate, the outlet is located on one side of the through hole along the first direction, and the outlet is perpendicular to the first bus outlet and the second bus outlet.

[0015] In some embodiments, the through hole is an elliptical hole or an oblong hole, the major axis of the through hole is L, and the minor axis of the through hole is H, wherein L and H satisfy: 20mm≤L≤30mm, 8mm≤H≤16mm respectively.

[0016] In some embodiments, along the length direction of the bypass strip, the distance between the busbar and the edge of the battery cell of the battery string of the battery cell group is L5, wherein L5 satisfies: 2mm≤L5≤7mm.

[0017] In some embodiments, an insulating strip is provided on one side of the bypass strip in the thickness direction, and the insulating strip has a break at the position corresponding to the lead-out portion.

[0018] In some embodiments, the insulating strip includes: a first insulating strip and a second insulating strip, wherein one end of the first insulating strip adjacent to the lead-out portion extends beyond the edge of the battery cell corresponding to the battery string, and the distance between the one end of the first insulating strip and the edge of the corresponding battery cell is L6, wherein L6 satisfies: 1mm≤L6≤2mm; one end of the second insulating strip adjacent to the lead-out portion extends beyond the edge of the corresponding battery cell, and the distance between the one end of the second insulating strip and the edge of the corresponding battery cell is L7, wherein L7 satisfies: 1mm≤L7≤2mm.

[0019] In some embodiments, the battery cell group includes a first battery cell group, a second battery cell group, and a third battery cell group. The first battery cell group, the second battery cell group, and the third battery cell group are arranged sequentially and connected in series along a parallel direction. The first battery cell group, the second battery cell group, and the third battery cell group each include a plurality of battery strings connected in parallel. The plurality of battery strings are arranged along the parallel direction, which is perpendicular to the string extension direction of the battery strings. The end of the first non-lead portion away from the lead portion is connected between one end of the first battery cell group and one end of the second battery cell group. The end of the second non-lead portion away from the lead portion is connected between the other end of the first battery cell group and the other end of the second battery cell group. The connection structure further includes a busbar, which includes a bus section, and the multiple battery strings of the first battery unit group, the second battery unit group, and the third battery unit group are respectively connected through the bus section; A connecting busbar is provided, and the second battery unit group and the third battery unit group are connected in series through the connecting busbar, and the connecting busbar is connected to the busbar; The photovoltaic module further includes a first diode, a second diode, and a third diode. The first diode is connected in reverse parallel between the busbar and the lead-out portion of the first battery cell group. The second diode is connected in reverse parallel between the busbar and the lead-out portion of the second battery cell group. The third diode is connected in reverse parallel between the connecting busbar and the busbar of the third battery cell group.

[0020] In some embodiments, the system further includes: an end busbar connecting adjacent first battery cell groups and second battery cell groups at the same end, wherein the two ends of the bypass bar overlap with adjacent end busbars.

[0021] In some embodiments, the lead-out portion is located in the central region of the photovoltaic module along the string extension direction, and the lead-out portion is located in the central region along the length direction of the bypass strip.

[0022] Additional aspects and advantages of the 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

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is a schematic diagram of the arrangement of battery cell groups in a photovoltaic module according to an embodiment of the present invention; Figure 2 yes Figure 1 Enlarged schematic diagram of region M in the middle; Figure 3 This is a partial schematic diagram of the battery cell group of a photovoltaic module according to an embodiment of the present invention; Figure 4 yes Figure 3 An enlarged schematic diagram of region N in the middle; Figure 5 yes Figure 3 Another enlarged schematic diagram of the N region; Figure 6 This is a schematic diagram of a bypass bar for a photovoltaic module according to an embodiment of the present invention; Figure 7 This is a partial three-dimensional disassembled schematic diagram of a photovoltaic module according to an embodiment of the present invention; Figure 8 yes Figure 7 An enlarged schematic diagram of region P in the middle; Figure 9 yes Figure 8 Another enlarged schematic diagram of region P in the middle; Figure 10 This is a three-dimensional schematic diagram of a photovoltaic module according to an embodiment of the present invention; Figure 11 yes Figure 10 Enlarged schematic diagram of the mid-Q region; Figure 12 This is a circuit diagram of a photovoltaic module according to an embodiment of the present invention; Figure 13 This is another circuit diagram of a photovoltaic module according to an embodiment of the present invention; Figure 14 This is another circuit diagram of a photovoltaic module according to an embodiment of the present invention.

[0024] Figure label: 100. Photovoltaic modules; 10. Battery cell group; 11. Battery string; 12. First battery cell group; 13. Second battery cell group; 14. Third battery cell group; 15. Sub-cell group; 20. Bypass strip; 21. First non-lead-out section; 22. Second non-lead-out section; 23. Lead-out section; 231. First lead-out section; 232. Second lead-out section; 24. First bending area; 25. Second bending area; 26. Third bending area; 30. Busbar; 31. First busbar section; 311. First busbar outlet section; 32. Second busbar section; 321. Second busbar outlet section; 33. Busbar section; 41. Connecting busbar; 42. End busbar; 50. Back plate; 51. Through hole; 60. Insulating strips; 71. First diode; 72. Second diode; 73. Third diode. Detailed Implementation

[0025] The following is for reference. Figures 1-14 A photovoltaic module 100 according to an embodiment of the present invention is described. The photovoltaic module 100 includes: a battery cell group 10 and a connection structure. Specifically, such as Figures 1-14 As shown, the battery cell group 10 extends along a first direction and is arranged along a second direction, including multiple battery strings 11 connected in series and / or in parallel. The first direction and the second direction are different. The connection structure includes a bypass strip 20, which is disposed between adjacent battery cell groups 10. The bypass strip 20 includes a first non-lead-out portion 21, a second non-lead-out portion 22, and a lead-out portion 23. The lead-out portion 23 is connected between the first non-lead-out portion 21 and the second non-lead-out portion 22. The lead-out portion 23 extends in a direction away from the first non-lead-out portion 21 and the second non-lead-out portion 22. The lead-out portion 23 is integrally formed with the first non-lead-out portion 21 and the second non-lead-out portion 22.

[0026] Optionally, the photovoltaic module 100 includes multiple battery cell groups 10, which are connected in series and / or in parallel. In this application, it includes two parallel battery cell groups 10 and one battery cell group 10 connected in series with them. The multiple battery cell groups 10 are symmetrically arranged along a first direction of the bypass strip 20, wherein each battery cell group 10 includes multiple battery strings 11. Optionally, in this application, each battery cell group 10 includes four battery strings 11. The four battery strings 11 are connected in parallel in pairs along the arrangement direction of the multiple battery cell groups 10, i.e., the second direction of the bypass strip 20, and then symmetrically distributed along the extension direction of the battery cell group 10, i.e., the first direction. The bypass strip 20 is disposed between two parallel battery cell groups 10 and extends between the two battery cell groups 10 along the first direction. The two ends of the bypass strip 20 are respectively connected between the ends of two adjacent battery cell groups 10 at corresponding ends.

[0027] The bypass strip 20 is connected in parallel with two adjacent battery cell groups 10. The first non-lead portion 21 and the second non-lead portion 22 of the bypass strip 20 are used to short-circuit the battery strings 11 of the adjacent corresponding non-lead portions in the battery cell group 10. Specifically, the battery cell group 10 includes a first sub-cell group and a second sub-cell group, which are symmetrically distributed along the direction in which the multiple battery cell groups 10 are arranged, i.e., along a second direction. The first non-lead portion 21 and the second non-lead portion 22 are connected in parallel with adjacent sub-cell groups 15, wherein the first non-lead portion 21 is connected in parallel with the first sub-cell group, and the second non-lead portion 22 is connected in parallel with the second sub-cell group. The lead portion 23 is connected to the first non-lead portion 21 and the second non-lead portion 22 at their adjacent ends, and the lead portion 23 extends out of the battery cell group 10 to be electrically connected to the junction box. The lead-out portion 23 is connected to the first non-lead-out portion 21 and the second non-lead-out portion 22 at both ends along the first direction, and at least a portion of the lead-out portion 23 extends along the third direction away from the first non-lead-out portion 21 and the second non-lead-out portion 22. The lead-out portion 23 is integrally formed with the first non-lead-out portion 21 and the second non-lead-out portion 22, and the lead-out portion 23 is formed by bending at least a portion of the bypass strip 20 near the central region of the photovoltaic module 100.

[0028] According to an embodiment of the photovoltaic module 100 of the present invention, a complete bypass strip 20 is provided between adjacent parallel battery cell groups 10. By forming at least a portion of the bypass strip 20 with a lead-out portion 23, the middle portion of the bypass strip 20 is formed as the lead-out portion 23, simplifying the structure of the bypass strip 20. Compared with multiple lead-out ends of the bypass strip 20, the single lead-out end design of this application can reduce the welding process and reduce the volume of the lead-out portion 23 used for lead-out of the bypass strip 20. This is beneficial to reducing the installation difficulty of the lead-out portion 23 when connecting to the junction box and improving the automation level of the installation of the lead-out portion 23 and the junction box. At the same time, since the lead-out portion 23 is part of the bypass strip 20 and is integrally formed with the bypass strip 20, the thickness of the non-lead-out portion is avoided, effectively reducing the risk of cell cracking on the battery string 11.

[0029] In some embodiments, such as Figure 7 As shown, the lead-out portion 23 includes: a first lead-out portion 231 and a second lead-out portion 232. One end of the first lead-out portion 231 is connected to one end of the second non-lead-out portion 22 adjacent to the first non-lead-out portion 21, and the other end of the first lead-out portion 231 extends out of the first non-lead-out portion 21. One end of the second lead-out portion 232 is connected to one end of the second non-lead-out portion 22 adjacent to the first non-lead-out portion 21, and the other end of the second lead-out portion 232 extends out of the second non-lead-out portion 22. The other end of the second lead-out portion 232 is connected to the other end of the first lead-out portion 231.

[0030] Optionally, the first lead-out portion 231 and the second lead-out portion 232 are respectively provided at the ends of the first non-lead-out portion 21 and the second non-lead-out portion 22 that are adjacent to each other. The first non-lead-out portion 21 and the second non-lead-out portion 22 are connected by the first lead-out portion 231 and the second lead-out portion 232 connected to each other. The end of the first lead-out portion 231 away from the second lead-out portion 232 is connected to the first non-lead-out portion 21, and the end of the second lead-out portion 232 away from the first lead-out portion 231 is connected to the second non-lead-out portion 22.

[0031] Therefore, the lead-out portion 23 includes a first lead-out portion 231 and a second lead-out portion 232, which facilitates the connection of the lead-out portion 23 with the first non-lead-out portion 21 and the second non-lead-out portion 22 to form a lead-out portion 23 for connection with the junction box, so as to conduct the current collected by the photovoltaic module 100 from the junction box, thereby reducing the number of welding points and processes of the lead-out portion 23 and the junction box.

[0032] In some embodiments, such as Figures 6-9 As shown, the surfaces of the second lead-out portion 232 and the first lead-out portion 231 that are opposite to each other are in contact.

[0033] Optionally, the end of the first lead-out portion 231 away from the first non-lead-out portion 21 and the end of the second lead-out portion 232 away from the second non-lead-out portion 22 are respectively led out in the same direction away from the corresponding non-lead-out portions. After being led out, the first lead-out portion 231 and the second lead-out portion 232 are arranged opposite to each other along the first direction and remain in contact, so that the first lead-out portion 231 and the second lead-out portion 232 can be in close contact. When the lead-out portion 23 is connected to the junction box, the number of welding positions and processes can be reduced. Furthermore, since the first lead-out portion 231 and the second lead-out portion 232 remain in contact during lead-out, the thickness of the lead-out portion in the first direction can be reduced, the space occupied by the lead-out portion 23 in the through hole 51 of the back plate 50 when it is engaged with the through hole 51 can be reduced, the size of the through hole 51 can be reduced, thereby reducing the area occupied by the through hole 51 on the solar cells laid on the back plate 50, increasing the arrangement of solar cells, and improving the output power of the photovoltaic module 100. Third direction Optionally, the surfaces of the first lead-out portion 231 and the second lead-out portion 232 are in contact with each other, and the structure of the lead-out portion 23 can be achieved by mutual extrusion. That is, the bypass strip 20 is extruded from both ends to the middle along the first direction, and a bent lead-out portion 23 is formed in the middle region of the bypass strip 20 for leading out the collected current. The structure and molding process of the lead-out portion 23 are simple, which helps to reduce the overall thickness of the lead-out portion 23, reduce the space occupation, and facilitate the lead-out setting of the lead-out portion 23.

[0034] In some embodiments, such as Figures 7-9As shown, in the length direction perpendicular to the bypass strip 20, the bypass strip 20 has a first bending area 24, a second bending area 25 and a third bending area 26. The first bending area 24 is located at the junction of the first lead-out portion 231 and the first non-lead-out portion 21. The second bending area 25 is located at the junction of the second lead-out portion 232 and the second non-lead-out portion 22. The third bending area 26 is located at the junction of the first lead-out portion 231 and the second lead-out portion 232.

[0035] Optionally, a first bending region 24 is formed by a smooth transition between the first lead-out portion 231 and the first non-lead-out portion 21; a second bending region 25 is formed between the second lead-out portion 232 and the second non-lead-out portion 22; and a third bending region 26 is formed between the first lead-out portion 231 and the second lead-out portion 232. Thus, by providing bending regions between the lead-out portion 23 and the non-lead-out portion, and between the two first lead-out portions 231 and the second lead-out portion 232, the stress at the connection between the lead-out portion 23 and the non-lead-out portion is reduced, thereby increasing the service life of the bypass strip 20.

[0036] Optionally, such as Figure 6 As shown, the lead-out portion 23 is formed by bending a portion of the bypass strip 20. A first bending region 24 and a second bending region 25 are formed on the bypass strip 20, and a third bending region 26 is formed on the lead-out portion 23. The bypass strip 20 extends along a first direction, and the portion of the bypass strip 20 near its central region is bent along a third direction toward the non-lead-out portion to form the lead-out portion 23. The first bending region 24 and the second bending region 25 are formed at the connection point between the lead-out portion 23 and the non-lead-out portion, and the third bending region 26 is formed at the end of the lead-out portion 23 away from the non-lead-out portion. Therefore, by forming the lead-out portion 23 by bending a portion of the bypass strip 20, the process of forming the lead-out portion 23 can be simplified, the structural strength of the lead-out portion 23 can be improved, the number of lead-out ends of the lead-out portion 23 can be reduced, and the welding process can be simplified.

[0037] In some embodiments, such as Figure 6 As shown, the thickness of the bypass strip 20 is t, where t satisfies: 0.1mm≤t≤0.2mm.

[0038] Optionally, the bypass strip 20 includes a lead-out portion 23 and a non-lead-out portion, with the lead-out portion 23 and the non-lead-out portion having the same thickness, and the lead-out portion 23 and the non-lead-out portion being integrally formed. In this application, the third direction mainly refers to the thickness direction of the non-lead-out portion. Optionally, the thickness t is 0.1mm, 0.15mm, or 0.2mm. When the thickness of the bypass strip 20 is greater than 0.2mm, the bypass strip 20 is relatively thick, and when the bypass strip 20 is welded inside the junction box, the large thickness makes it easy to fail to weld through and achieve an effective connection, affecting the reliability of the connection between the lead-out portion 23 and the junction box. When the thickness of the bypass strip 20 is less than 0.1mm, the bypass strip 20 is relatively thin, the power led out of the bypass strip 20 to the junction box is low, and it is also easy to cause poor structural strength of the bypass strip 20, affecting the service life of the photovoltaic module 100. Therefore, limiting the thickness of the bypass strip 20 ensures that the bypass strip 20 and the junction box can be smoothly welded to achieve an electrical connection, while also facilitating the installation and welding of the junction box and improving the welding effect.

[0039] In some embodiments, such as Figures 7-11 As shown, the battery cell assembly 10 has a back plate 50 on one side along the third direction, and a through hole 51 is formed on the back plate 50. The lead-out portion 23 extends out of the through hole 51 in the third direction. The third direction is orthogonal to the first direction and the second direction. The shortest distance between the lead-out portion 23 and the through hole 51 in the first direction is L1, and the shortest distance between the lead-out portion 23 and the through hole 51 in the first direction is L2. L1 and L2 satisfy: 2mm≤L1≤8mm and / or 8mm≤L2≤14mm, respectively.

[0040] Optionally, the photovoltaic module 100 includes a backsheet 50 and battery cell groups 10 disposed between the backsheets 50. The battery cell groups 10 are disposed between the backsheets 50 along a third direction. The backsheet 50 is provided with a through hole 51 for cooperating with an internally extended lead-out portion 23, so that the lead-out portion 23 extends out from the through hole 51 and is electrically connected to a junction box on the side of the backsheet 50 away from the battery cell group 10. The through hole 51 has sidewalls arranged opposite each other in a first direction and sidewalls arranged opposite each other in a second direction. The first direction is the direction in which the bypass strip 20 extends, and the second direction is the arrangement direction of the multiple battery cell groups 10, that is, the width direction of the bypass strip 20. The distance between the two sidewalls of the through hole 51 that are opposite each other along the first direction is less than the distance between the two sidewalls that are opposite each other along the second direction. The minimum distance between the lead-out portion 23 and the sidewall of the through hole 51 along the first direction is L1. At this time, the lead-out portion 23 is set along the sidewall of the through hole 51 adjacent to the first direction. By limiting the distance between the lead-out portion 23 and the aforementioned sidewall, the distance between the lead-out portion 23 and the edge of the through hole 51 is avoided when the lead-out portion 23 is set, so that the distance between the lead-out portion 23 and the edge of the through hole 51 is not too small, which would cause the lead-out portion 23 to be too close to the edge of the through hole 51 during the lamination process. This increases the thickness at the edge and reduces the occurrence of cell cracking caused by the extrusion of the cell during the lamination process.

[0041] Optionally, the distance between the lead-out portion 23 and one side wall of the through hole 51 along the first direction is L2. In this application, the lead-out portion 23 is disposed within the through hole 51 along the first direction adjacent to the other side wall of the through hole 51. Optionally, among the two opposite side walls of the through hole 51 along the first direction, the lead-out portion 23 can be adjusted between the two side walls of the through hole 51 along the first direction according to the usage scenario, changing the position of the lead-out portion 23 within the through hole 51 to meet the connection between different junction boxes and the lead-out portion 23, increasing the adaptability and convenience of the lead-out portion 23 when connecting to junction boxes of different types or locations.

[0042] Optionally, in this application, the shortest distance between the lead-out portion 23 and one sidewall of the through hole 51 along the first direction is L1, and the shortest distance between the lead-out portion 23 and the other sidewall of the through hole 51 along the first direction is L2. L1 is 2mm, 4mm, 6mm, or 8mm, and L2 is 8mm, 10mm, 12mm, or 14mm. That is, in this application, the lead-out portion 23 is positioned biased towards one side of the through hole 51 along the first direction to facilitate its placement within the junction box, reduce the complexity of connecting to the junction box, lower the requirements for the photovoltaic module 100 manufacturing process, and prevent the lead-out portion 23 from contacting the solar cells.

[0043] Therefore, by limiting the position of the lead-out portion 23 within the through hole 51, the process requirements are simplified, and the risk of contact between the lead-out portion 23 and the edge of the through hole 51 during the lamination process is avoided due to the close distance between the lead-out portion 23 and the side wall of the through hole 51. This avoids increasing the thickness at the edge of the through hole 51, reduces the impact of the lead-out portion 23 contacting the edge or increasing the thickness at the edge on the cell fragments on the battery string 11, effectively prevents the lead-out portion 23 from contacting the cell fragments, and increases the protection of the cell fragments.

[0044] In some embodiments, such as Figures 3-10 As shown, the connection structure also includes a busbar 30, which includes a first busbar 31 and a second busbar 32. One end of the first busbar 31 has a first busbar outlet 311, and one end of the second busbar 32 has a second busbar outlet 321. The first busbar outlet 311 and the second busbar outlet 321 are located on both sides of the outlet 23 in the width direction.

[0045] Optionally, the busbar 30 is disposed in the middle of the battery cell group 10 to connect the battery strings 11 on both sides, and is used to collect the current generated by the multiple battery strings 11 on the battery cell group 10. The photovoltaic module 100 includes multiple battery cell groups 10, and multiple busbar sections 33 of the busbar 30 are disposed on both sides of the bypass bar 20 along a second direction. The multiple busbar sections 33 include a first busbar section 31 and a second busbar section 32. The ends of the first busbar section 31 and the second busbar section 32 adjacent to the bypass bar 20 are respectively a first busbar lead-out section 311 and a second busbar lead-out section 321. The first busbar lead-out section 311 and the second busbar lead-out section 321 are led out from the through hole 51 and are spaced apart from the lead-out section 23. The direction of extension of the lead-out section 23 is the same as the direction of extension of the busbar lead-out section 23.

[0046] Therefore, the first busbar lead-out section 311 and the second busbar lead-out section 321 are provided on both sides of the lead-out section 23, which facilitates the lead-out of the current of the battery string 11 on both sides of the bypass bar 20 along the second direction, while avoiding contact with the lead-out section 23 to prevent short circuit, thus improving the safety of the design.

[0047] The minimum distance between the first bus outlet 311 and the outlet 23 is L. 31 The minimum distance between the second bus outlet 321 and the outlet 23 is L. 32 , where L 31 L 32 Each satisfies: 3mm≤L 31 ≤12mm, and / or, 3mm≤L 32 ≤12mm.

[0048] Optionally, the first bus outlet 311 and the second bus outlet 321 are spaced apart from the outlet 23 along the second direction, wherein the distance between the first bus outlet 311 and the outlet 23 along the second direction is L. 31 Optionally, L 31 The diameter is 3mm, 5mm, 7mm, 9mm, 10mm, or 12mm; the distance between the second bus outlet 321 and the outlet 23 along the second direction is L. 32 Optionally, L 32 The distances are 3mm, 5mm, 7mm, 9mm, 10mm, or 12mm. Therefore, by limiting the distance between the lead-out portion 23 and the multiple bus leads 23, the risk of contact due to insufficient distance between the lead-out portion 23 and the bus leads 23 is avoided. This would easily lead to the failure of the diodes connected to the lead-out portion 23 and the bus leads 23. The spaced-out lead-out portion 23 and the bus leads 23 increase the safety of the photovoltaic module 100 installation.

[0049] In some embodiments, such as Figures 8-11 As shown, the length of the first bus outlet 311 is L.41 The length L of the second bus outlet 321 42 , where L 41 L 42 Each satisfies: 15mm≤L 41 ≤25mm, and / or, 15mm≤L 42 ≤25mm.

[0050] Optionally, the lengths of the first busbar lead-out portion 311 and the second busbar lead-out portion 321 can be understood as the length of the portion of the busbar 30 that bends and mates with the through hole 51 along a third direction, and the distance of the first busbar lead-out portion 311 and the second busbar lead-out portion 321 from the battery cell along a third direction.

[0051] In this application, the busbar 30 also includes a non-leading portion, which includes a first non-leading portion and a second non-leading portion. The first leading portion 311 is perpendicular to the first non-leading portion, and the second leading portion 321 is perpendicular to the second non-leading portion. If the lengths of the first leading portion 311 and the second leading portion 321 are too long, they may easily conduct circuit loops within the junction box when connected. That is, if the first leading portion 311 is connected to one of the two diodes, there is a risk of connection to the other diode as well. Furthermore, the long length of the leading portion 23 is not conducive to the installation and setup of the junction box when it needs to be connected, increasing assembly difficulty. At the same time, it also avoids the first leading portion 311 and the second leading portion 222 being too short, which would prevent them from connecting to the junction box after the leading portion 23 passes through the through hole 51, or result in a poor connection reliability.

[0052] Therefore, by limiting the lengths of the first busbar lead-out 311 and the second busbar lead-out 321, the lead-out 23 is prevented from being too long or too short, which would affect the connection between the lead-out 23 and the junction box. The appropriate length ensures the connection between the lead-out 23 and the junction box while avoiding the waste of materials due to excessive length. This also prevents the first busbar lead-out 311 and the second busbar lead-out 321 from being short-circuited in the junction box, thus ensuring the reliability of the connection between the busbar lead-out 23 and the junction box.

[0053] In some embodiments, such as Figures 8-9 As shown, the first bus outlet 311 and the second bus outlet 321 are arranged opposite to each other along the second direction. The first bus outlet 311, the second bus outlet 321 and the outlet 23 extend through the through hole 51 in a direction away from the back plate 50. The outlet 23 is located on one side of the through hole 51 along the first direction and is perpendicular to the first bus outlet 311 and the second bus outlet 321.

[0054] Optionally, the first lead-out portion 231 and the second lead-out portion 232 are arranged opposite to each other and attached along the first direction, and the first bus lead-out portion 311 and the second bus lead-out portion 321 are arranged opposite to each other along the second direction and are located on both sides of the lead-out portion 23. The lead-out portion 23 is arranged perpendicularly to the first bus lead-out portion 311 and the second bus lead-out portion 321 and leads out from the through hole 51. This ensures the width of the first and second bus non-lead-out portions in the first direction, ensures the stability of the bypass strip 20 between the insulating member and the back plate 50, ensures the contact area, reduces the thickness, and avoids the influence of lamination stress on the cracking of the battery string 11. When the lead-out portion 23 is located in the through hole 51, it can be selectively adjusted to a suitable position along the first direction according to the needs of the setting position. The lead-out portion 23 is arranged perpendicularly to the first bus lead-out portion 311 and the second bus lead-out portion 321, which facilitates reducing the width of the through hole 51 along the first direction and increasing the structural strength of the back plate 50. In this application, the lead-out portion 23 is provided on one side of the through hole 51 along the first direction. That is, the shortest distance between the lead-out portion 23 and the two side walls of the through hole 51 along the first direction is different, which makes it easier for the lead-out portion 23 to be adapted to more types of junction boxes.

[0055] Optionally, the location of the lead-out portion 23 along the first direction adjacent to the through hole 51 can be designed according to the type of junction box actually used for mating, in order to reduce the manufacturing cost of the photovoltaic module 100.

[0056] Therefore, the first busbar lead-out portion 311 and the second busbar lead-out portion 321 are arranged opposite to each other along the second direction, which facilitates the optimization of the structure of the busbar lead-out portion 23 in the through hole 51, and facilitates the lead-out portion 23 to be led out while avoiding contact with the lead-out portion 23, thereby reducing the risk of short circuit between the lead-out portion 23 and the busbar lead-out portion 23; the lead-out portion 23 and the busbar lead-out portion 23 are arranged perpendicularly, which facilitates the cooperation of the lead-out portion 23 and the busbar lead-out portion 23 in the through hole 51, thereby increasing the penetration rate of the busbar lead-out portion 23 and the lead-out portion 23 in the through hole 51.

[0057] In some embodiments, such as Figure 4 and Figure 11 As shown, the through hole 51 is an elliptical hole or an oblong hole. The length of the major axis of the through hole 51 is L, and the length of the minor axis of the through hole 51 is H. Among them, L and H satisfy: 20mm≤L≤30mm and 8mm≤H≤16mm, respectively.

[0058] Optionally, the first direction corresponds to the short axis direction of the through hole 51, and the second direction corresponds to the long axis direction of the through hole 51. The first busbar lead-out portion 311 and the second busbar lead-out portion 321 are arranged opposite each other along the first direction, i.e., the long axis direction. When the long axis of the through hole 51 is long, the distance between the two busbar leads 23 is large, occupying space within the through hole 51, which is not conducive to integrated design, not conducive to the setting of the junction box, and increases the complexity of the connection between the busbar lead-out portion 23 and the junction box. If the long axis is too short, the busbar lead-out portion 23 is prone to contact with the lead-out portion 23, resulting in a short circuit, which poses a safety risk and is not conducive to the assembly of the busbar lead-out portion 23 and the lead-out portion 221 within the through hole 51. When the minor axis of the through hole 51 is relatively long, the proximity of the manifold outlet 23 distributed along the major axis poses a risk of contact, which also affects the efficiency of the fit between the outlet 23 and the manifold outlet 23 within the through hole 51. When the minor axis of the through hole 51 is relatively short, it is not conducive to the insertion of the manifold outlet 23. Optionally, L is 20mm, 25mm, or 30mm, and H is 8mm, 10mm, 15mm, or 16mm.

[0059] Therefore, by limiting the range of the long axis and the short axis of the through hole 51, the through hole 51 is made to have a suitable distance in the long axis direction and the short axis direction. This facilitates the cooperation between the lead-out part 23 and the busbar lead-out part 23 and the through hole 51, avoids short circuits caused by close contact between the lead-out part 23 and the busbar lead-out part 23, and avoids the large opening range of the through hole 51 affecting the laying area of ​​the battery cell, which could lead to the battery cell being exposed inside the through hole 51 and the risk of cell cracking during lamination. At the same time, it facilitates the reasonable distribution of the busbar lead-out part 23 and the lead-out part 23 in the through hole 51 and their connection to the junction box through the through hole 51, which is beneficial to improving the installation of the busbar strip 30 and the bypass strip 20 at the through hole 51.

[0060] In some embodiments, such as Figures 3-7 As shown, along the length of the bypass strip 20, the distance between the busbar and the edge of the cell in the battery string 11 of the battery unit group 10 is L5, where L5 satisfies: 2mm ≤ L5 ≤ 7mm. Optionally, the battery unit group 10 includes multiple sub-unit groups 15, which are symmetrically distributed on both sides of the busbar 30 along the first direction, i.e., the length of the bypass strip 20. The busbar 30 is spaced apart from the cells of the adjacent battery string 11 at a distance of L5. When the distance is large, the length of the battery string 11 is reduced, thereby reducing the number of cells and affecting the output power of the photovoltaic module 100. When the distance is small, the busbar 30 is more likely to contact the cells, increasing the risk of cell cracking during lamination. Optionally, L5 is 2mm, 5mm, or 7mm.

[0061] Therefore, by limiting the distance between the busbar 30 and the adjacent battery cell along the first direction, the busbar 30 and the battery cell are kept at a distance, avoiding the risk of the battery cell cracking during the lamination process due to contact between the busbar 30 and the battery cell, thus protecting the battery cell.

[0062] Optionally, the busbar 30 is spaced apart from the battery cells on both sides along the first direction, and the distance is set to L5.

[0063] In some embodiments, such as Figures 2-3 As shown, an insulating strip 60 is provided on one side of the bypass strip 20 in the thickness direction, and the insulating strip has a break at the position corresponding to the lead-out part.

[0064] Optionally, an insulating strip 60 is provided between the bypass strip 20 and the battery string 11 to form insulation between the bypass strip 20 and the battery string 11, thereby preventing short circuits in the battery string 11. The thickness direction of the bypass strip 20 refers to the side of the non-lead-out portion along the third direction where the insulating strip 60 is provided. The insulating strip 60 is segmented and is provided on both sides of the lead-out portion 23 along the first direction. The lead-out portion 23 is positioned opposite the break and leads out from the through hole 51.

[0065] Therefore, the insulating strip 60 is provided with a break at the position corresponding to the lead-out portion 23 to avoid increasing the thickness of the photovoltaic module 100 at the lead-out portion 23, and to avoid the risk of cell cracking caused by the shrinkage of the insulating strip 60 during the lamination process due to the shrinkage of the insulating strip 60.

[0066] In some embodiments, such as Figure 2 and Figures 5-9 As shown, the insulating strip includes a first insulating strip and a second insulating strip. One end of the adjacent lead-out portion 23 of the first insulating strip 61 extends beyond the edge of the corresponding battery cell of the battery string 11. The distance between one end of the first insulating strip 61 and the edge of the corresponding battery cell is L6, wherein L6 satisfies: 1mm≤L6≤2mm. One end of the adjacent lead-out portion 23 of the second insulating strip 62 extends beyond the edge of the corresponding battery cell. The distance between one end of the second insulating strip 62 and the edge of the corresponding battery cell is L7, wherein L7 satisfies: 1mm≤L7≤2mm.

[0067] Optionally, one end of the first insulating strip 60 and the second insulating strip 60 adjacent to the through hole 51 extends beyond the edge of the battery cell in the battery string 11 adjacent to the through hole 51, so that the bypass strip 20 provided on the insulating strip 60 can avoid contact with the battery cell and cause a short circuit. When the distance between the first insulating strip 60 and the second insulating strip 60 and the corresponding edge of the battery cell is small, the bypass strip 20 is prone to contact with the battery cell, which poses a risk of contact and may lead to failure of the insulating strip 60, affecting the safety of use; when the distance between the first insulating strip 60 and the second insulating strip 60 and the corresponding edge of the battery cell is large, there is interference with the setting of the busbar 30, which is not conducive to the installation of the busbar lead-out part 23 and the lead-out part 23 at the through hole 51. Optionally, L6 is 1mm, 1.5mm or 2mm, and L7 is 1mm, 1.5mm or 2mm.

[0068] Therefore, by limiting the edge of the insulating strip 60 and the corresponding solar cell, the stress shrinkage in the through hole 51 area during the lamination process can prevent the insulating strip 60 from wrinkling and changing the stress at the edge of the through hole 51 on the solar cell. This allows the insulating strip 60 to extend beyond the edge of the solar cell, ensuring complete isolation between the bypass strip 20 and the solar cell even when the insulating strip 60 shrinks. This effectively reduces the possibility of contact between the solar cell and the bypass strip 20, achieving insulation of the bypass strip 20. It also prevents the bypass strip 20 from being squeezed and cracked due to stress shrinkage, thus increasing the safety of the photovoltaic module 100.

[0069] Optionally, the width of the insulating strip 60 along the second direction is greater than or equal to the width of the bypass strip 20 to prevent the bypass strip 20 from contacting adjacent battery cells, thus avoiding short circuits and preventing the bypass strip 20 from failing. In some embodiments, such as Figure 1 as well as Figures 12-14 As shown, the battery cell group 10 includes a first battery cell group 12, a second battery cell group 13, and a third battery cell group 14. The first battery cell group 12, the second battery cell group 13, and the third battery cell group 14 are arranged sequentially and connected in series along a series-parallel direction. The first battery cell group 12, the second battery cell group 13, and the third battery cell group 14 each include multiple battery strings 11 connected in parallel. The multiple battery strings 11 are arranged along a series-parallel direction, which is perpendicular to the string extension direction of the battery strings 11. One end of the first non-lead portion 21, away from the lead portion 23, is connected between one end of the first battery cell group 12 and one end of the second battery cell group 13. One end of the second non-lead portion 22, away from the lead portion 23, is connected between the other end of the first battery cell group 12 and the other end of the second battery cell group 13.

[0070] Optionally, the photovoltaic module 100 includes a first battery cell group 12 and a second battery cell group 13 connected in parallel, and a third battery cell group 14 connected in series with them. Each battery cell group 10 includes multiple sub-cell groups 15, which are symmetrically distributed on both sides of the busbar 30 along a first direction and connected to the busbar 30. Each sub-cell group 15 includes two battery strings 11 connected in parallel. A bypass bar 20 is disposed between the first battery cell group 12 and the second battery cell group 13, and is connected in parallel with the multiple sub-cell groups 15 of the first battery cell group 12 and the second battery cell group 13.

[0071] Optionally, the connection structure further includes a busbar 30, which is disposed in the middle of the photovoltaic module 100 and is used to connect to the multiple battery strings 11 included in the multiple battery unit groups 10. The busbar 30 includes a bus section 33, through which the multiple battery strings 11 of the first battery unit group 12, the second battery unit group 13 and the third battery unit group 14 are respectively connected.

[0072] The photovoltaic module 100 also includes a connecting busbar 41, through which the second battery cell group 13 and the third battery cell group 14 are connected in series. The connecting busbar 41 is connected to the busbar 30. Optionally, both ends of the connecting busbar 41 are connected to both ends of the third battery cell group 14. When the photovoltaic module 100 is operating normally, combined with... Figures 12-13 The current transmitted from the first battery cell group 12 and the second battery cell group 13 flows to the third battery cell group 14 via the connecting busbar 41. When some cells in the third battery cell have a problem, the busbar 30 collects the current from the first battery cell group 12 and the second battery cell group 13 and then flows to the non-problematic sub-cell group 15 via the connecting busbar 41.

[0073] The photovoltaic module 100 also includes a first diode 71, a second diode 72 and a third diode 73. The first diode 71 is connected in reverse parallel between the busbar 33 and the lead-out portion 23 of the first battery cell group 12. The second diode 72 is connected in reverse parallel between the busbar 33 and the lead-out portion 23 of the second battery cell group 13. The third diode 73 is connected in reverse parallel between the busbar 41 and the busbar 33 of the third battery cell group 14.

[0074] Optionally, when the photovoltaic module 100 is operating normally, the current generated by the first battery cell group 12 flows to the second battery cell group 13 and then through the busbar 30 and connecting busbar 41 to the third battery cell group 14.

[0075] When a short circuit occurs in the sub-unit group 15 of the first battery cell group 12, the current generated by the sub-unit group 15 that is not short-circuited is collected normally and flows to the second battery cell group 13. The current flows through the bus bar 30 connected to the short-circuited sub-unit group 15, through the first diode 71 connected in reverse parallel with it, from the adjacent bypass bar 20 to the corresponding second battery cell group 13, and through the connecting bus bar 41 to the third battery cell group 14.

[0076] In some embodiments, such as Figure 1 and Figures 12-14 As shown, it also includes: an end busbar 42, which connects adjacent first battery cell group 12 and second battery cell group 13 at the same end of the first battery cell group 12 and the second battery cell group 13, and the two ends of the bypass bar 20 overlap with the adjacent end busbar 42 respectively.

[0077] Optionally, a bypass strip 20 is provided between the first battery unit group 12 and the second battery unit group 13. The two ends of the first battery unit group 12 and the second battery unit group 13 are connected by an end busbar 42. The two ends of the bypass strip 20 along the first direction are respectively connected to the end busbars 42 of the corresponding ends of the first battery unit group 12 and the second battery unit group 13, and are connected between the corresponding ends of the first battery unit group 12 and the second battery unit group 13. When the sub-unit group 15 of the first battery unit group 12 is short-circuited, it does not affect the current collection of the non-short-circuited sub-unit group 15, nor the current collection of the sub-unit group 15 included in the second battery unit group 13. The first battery unit group 12 and the second battery unit group 13 are connected at the same end by an end busbar 42, and the two ends of the bypass strip 20 are respectively connected to the corresponding end busbars 42. Therefore, the end busbar 42 facilitates the connection between the first battery cell group 12 and the second battery cell group 13, so that the current of the first battery cell group 12 can flow to the second battery cell group 13 through the end busbar 42. The end busbar 42 facilitates the formation of a closed loop within the photovoltaic module 100, which is convenient for the collection and transmission of current.

[0078] In some embodiments, such as Figures 7-13 As shown, lead-out portion 23 is located in the central region of the photovoltaic module 100 along the string extension direction, and lead-out portion 23 is located in the central region of the bypass strip 20 along the length direction.

[0079] Optionally, the bypass strip 20 extends along a first direction and is pressed into the through hole 51 along the first direction to form an outlet 23. The outlet 23 is located in the central region of the bypass strip 20 to facilitate its installation within the photovoltaic module 100, making it suitable for symmetrically arranged battery cell groups 10. This ensures that the bypass strip 20 is aligned with the battery cell group 10 along the first direction and symmetrically arranged along the second direction. Thus, the outlet 23 being located in the central region along the length of the bypass strip 20 facilitates its connection with the through hole 51, simplifies the process of assembling the bypass strip 20 within the photovoltaic module 100, and improves the assembly efficiency of the photovoltaic module 100.

[0080] In the description of this specification, 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.

[0081] Although embodiments of the 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 invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module (100), characterized in that, include: A battery cell group (10) extends along a first direction and is arranged along a second direction, including multiple battery strings (11) connected in series and / or in parallel, wherein the first direction and the second direction are different; The connection structure includes a bypass strip (20) disposed between adjacent battery cell groups. The bypass strip (20) includes a first non-lead portion (21), a second non-lead portion (22), and a lead portion (23). The lead portion (23) is connected between the first non-lead portion (21) and the second non-lead portion (22). The lead portion (23) extends in a direction away from the first non-lead portion (21) and the second non-lead portion (22). The lead portion (23) is integrally formed with the first non-lead portion (21) and the second non-lead portion (22).

2. The photovoltaic module (100) according to claim 1, characterized in that, The lead-out portion (23) includes: The first lead-out portion (231) has one end connected to the first non-lead-out portion (21) adjacent to one end of the second non-lead-out portion (22), and the other end of the first lead-out portion (231) extends out of the first non-lead-out portion (21). The second lead-out portion (232) has one end connected to the end of the second non-lead-out portion (22) adjacent to the end of the first non-lead-out portion (21), and the other end of the second lead-out portion (232) extends out of the second non-lead-out portion (22). The other end of the second lead-out portion (232) is connected to the other end of the first lead-out portion (231).

3. The photovoltaic module (100) according to claim 2, characterized in that, The second lead-out portion (232) and the first lead-out portion (231) are in contact with each other on their opposing surfaces.

4. The photovoltaic module (100) according to claim 2, characterized in that, The bypass strip (20) has a first bending area (24), a second bending area (25) and a third bending area (26). The first bending area (24) is located at the junction of the first lead-out portion (231) and the first non-lead-out portion (21). The second bending area (25) is located at the junction of the second lead-out portion (232) and the second non-lead-out portion (22). The third bending area (26) is located at the junction of the first lead-out portion (231) and the second lead-out portion (232).

5. The photovoltaic module (100) according to claim 1, characterized in that, The lead-out portion (23) is formed by bending a portion of the bypass strip (20), with a first bending area (24) and a second bending area (25) formed on the bypass strip (20), and a third bending area (26) formed on the lead-out portion (23).

6. The photovoltaic module (100) according to claim 1, characterized in that, The thickness of the bypass strip (20) is t, wherein t satisfies: 0.1mm≤t≤0.2mm.

7. The photovoltaic module (100) according to claim 1, characterized in that, The battery cell assembly (10) has a back plate (50) on one side along a third direction, and a through hole (51) is formed on the back plate (50). The lead-out part (23) extends out of the through hole (51) in the third direction, and the third direction is orthogonal to the first direction and the second direction. The shortest distance between the lead-out part (23) and the through hole (51) in the first direction is L1, and the shortest distance between the lead-out part (23) and the through hole (51) in the first direction is L2, wherein L1 and L2 respectively satisfy: 2mm≤L1≤8mm, and / or, 8mm≤L2≤14mm.

8. The photovoltaic module (100) according to claim 7, characterized in that, The connection structure further includes a busbar (30), which includes a first busbar (31) and a second busbar (32). One end of the first busbar (31) has a first busbar outlet (311), and one end of the second busbar (32) has a second busbar outlet (321). The first busbar outlet (311) and the second busbar outlet (321) are located on both sides of the outlet (23) in the width direction. The minimum distance between the first bus outlet (311) and the outlet (23) is L. 31 The minimum distance between the second bus outlet (321) and the outlet (23) is L. 32 , wherein, the L 31 L 32 Each satisfies: 3mm≤L 31 ≤12mm, and / or, 3mm≤L 32 ≤12mm.

9. The photovoltaic module (100) according to claim 8, characterized in that, The length of the first bus outlet (311) is L 41 The length L of the second bus outlet (321) 42 , wherein, the L 41 L 42 Each satisfies: 15mm≤L 41 ≤25mm, and / or, 15mm≤L 42 ≤25mm.

10. The photovoltaic module (100) according to claim 8, characterized in that, The first bus outlet (311) and the second bus outlet (321) are arranged opposite to each other along the second direction. The first bus outlet (311), the second bus outlet (321) and the outlet (23) extend out of the through hole (51) in a direction away from the back plate. The outlet (23) is perpendicular to the first bus outlet (311) and the second bus outlet (321).

11. The photovoltaic module (100) according to claim 7, characterized in that, The through hole (51) is an elliptical hole or an oblong hole. The length of the major axis of the through hole (51) is L, and the length of the minor axis of the through hole (51) is H. The L and H satisfy the following conditions: 20mm≤L≤30mm and 8mm≤H≤16mm, respectively.

12. The photovoltaic module (100) according to claim 8, characterized in that, Along the length direction of the bypass strip (20), the distance between the busbar (30) and the edge of the battery cell of the battery string (11) of the battery unit group (10) is L5, wherein L5 satisfies: 2mm≤L5≤7mm.

13. The photovoltaic module (100) according to claim 1, characterized in that, An insulating strip (60) is provided on one side of the bypass strip in the thickness direction, and the insulating strip has a break at the position corresponding to the lead-out part.

14. The photovoltaic module (100) according to claim 13, characterized in that, The insulating strip includes: A first insulating strip (61) extends from one end of the first insulating strip (61) adjacent to the lead-out portion (23) beyond the edge of the battery cell corresponding to the battery string (11), and the distance between the one end of the first insulating strip (61) and the edge of the corresponding battery cell is L6, wherein L6 satisfies: 1mm≤L6≤2mm. The second insulating strip (62) extends beyond the edge of the corresponding battery cell at one end adjacent to the lead-out portion (23), and the distance between the end of the second insulating strip (62) and the edge of the corresponding battery cell is L7, wherein L7 satisfies: 1mm≤L7≤2mm.

15. The photovoltaic module (100) according to any one of claims 1-14, characterized in that, The battery unit group (10) includes a first battery unit group (12), a second battery unit group (13), and a third battery unit group (14). The first battery unit group (12), the second battery unit group (13), and the third battery unit group (14) are arranged in series along a parallel direction. The first battery unit group (12), the second battery unit group (13), and the third battery unit group (14) each include a plurality of battery strings (11) connected in parallel. The plurality of battery strings (11) are arranged along the parallel direction, which is perpendicular to the string extension direction of the battery strings (11). One end of the first non-lead (21) away from the lead (23) is connected between one end of the first battery unit group (12) and one end of the second battery unit group (13). One end of the second non-lead (22) away from the lead (23) is connected between the other end of the first battery unit group (12) and the other end of the second battery unit group (13). The connection structure also includes a busbar (30), which includes a busbar (33). The multiple battery strings (11) of the first battery unit group (12), the second battery unit group (13) and the third battery unit group (14) are connected to each other through the busbar (33). The connecting busbar (41) connects the second battery unit group (13) and the third battery unit group (14) in series, and the connecting busbar (41) is connected to the busbar (30). The photovoltaic module (100) further includes a first diode (71), a second diode (72) and a third diode (73). The first diode (71) is connected in reverse parallel between the busbar (33) and the lead-out portion (23) of the first battery cell group (12). The second diode (72) is connected in reverse parallel between the busbar (33) and the lead-out portion (23) of the second battery cell group (13). The third diode (73) is connected in reverse parallel between the connecting busbar (41) and the busbar (33) of the third battery cell group (14).

16. The photovoltaic module (100) according to claim 15, characterized in that, Also includes: End busbar (42) connects adjacent first battery cell group (12) and second battery cell group (13) at the same end of the first battery cell group (12) and the second battery cell group (13), and the two ends of the bypass bar (20) overlap with the adjacent end busbar (42).

17. The photovoltaic module (100) according to claim 15, characterized in that, The lead-out portion (23) is located in the central region of the photovoltaic module (100) along the string extension direction, and the lead-out portion (23) is located in the central region of the bypass strip (20) along its length direction.

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