Photovoltaic module

Abstract

The present application provides a photovoltaic module comprising: a bus bar extending in a first direction; the first battery string and the second battery string are located on the two sides of the bus bar respectively in the second direction, and the first direction intersects with the second direction; the first welding strips are arranged at intervals in the first direction and extend in the second direction, the first ends of the first welding strips are connected with the bus bars, and the second ends of the first welding strips are connected with the first battery strings; the second welding strips are arranged at intervals in the first direction and extend in the second direction, the first ends of the second welding strips are connected with the bus bars, and the second ends of the second welding strips are connected with the second battery strings; the photovoltaic module meets at least one of the following conditions: the first end of the first welding strip is overlapped with the first end of the second welding strip, the overlapping area is greater than a target area, and the target area is a contact area between the first end of the first welding strip and the bus bar or a contact area between the first end of the second welding strip and the bus bar; the first ends of the first welding strips and the first ends of the second welding strips are arranged at intervals. The welding reliability of the welding strip is guaranteed.

Description

Technical Field

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

[0002] Photovoltaic power generation is a technology that directly converts light energy into electrical energy by using the photovoltaic effect at the semiconductor interface. In a photovoltaic module, multiple solar cells are connected in series to form a battery string through solder ribbons, and multiple battery strings are connected in series by welding the solder ribbons to a bus bar. During the formation of a photovoltaic module, there are often some problems, such as a small welding area between the solder ribbon and the bus bar, resulting in poor welding.

[0003] The above information disclosed in the background art section is only used to enhance the understanding of the background art of the technology described herein. Therefore, the background art may contain certain information that is not prior art known to those skilled in the art in this country. Summary of the Invention

[0004] The main object of this application is to provide a photovoltaic module to solve the problem of poor welding reliability of photovoltaic modules in the prior art.

[0005] To achieve the above object, according to one aspect of this application, there is provided a photovoltaic module, including: a bus bar extending in a first direction; a first battery string and a second battery string located on both sides of the bus bar in a second direction, the first direction intersecting the second direction; a plurality of first solder ribbons spaced apart along the first direction, the first solder ribbons extending in the second direction, a first end of each first solder ribbon being connected to the bus bar, and a second end of each first solder ribbon being connected to the first battery string; a plurality of second solder ribbons spaced apart along the first direction, the second solder ribbons extending in the second direction, a first end of each second solder ribbon being connected to the bus bar, and a second end of each second solder ribbon being connected to the second battery string; the photovoltaic module satisfies at least one of the following: the first ends of the first solder ribbons and the first ends of the second solder ribbons overlap, and the overlapping area is greater than a target area, the target area being the contact area between the first end of the first solder ribbon and the bus bar or the contact area between the first end of the second solder ribbon and the bus bar; the first ends of the first solder ribbons and the first ends of the second solder ribbons are spaced apart.

[0006] Optionally, the edge lines of the first battery string and the second battery string extending along the second direction are parallel, the first solder tapes and the second solder tapes are alternately arranged at intervals along the first direction, the minimum distance between the nth first solder tape arranged along the first direction and the edge of the first battery string is a first distance, the minimum distance between the nth second solder tape arranged along the first direction and the edge of the second battery string is a second distance, n is a positive integer and n ≤ i, where i is the minimum value of the total number of the first solder tapes and the total number of the second solder tapes, and the photovoltaic module satisfies one of the following: all the first distances are the same as the second distances; at least one of the first distances is different from the second distances.

[0007] Optionally, the distance between the edge lines of the first battery string and the second battery string is less than or equal to 2 mm.

[0008] Optionally, the edge lines of the first battery string and the second battery string extending along the second direction are collinear, the first solder tapes and the second solder tapes are alternately arranged at intervals along the first direction, the minimum distance between the nth first solder tape arranged along the first direction and the edge of the first battery string is a first distance, the minimum distance between the nth second solder tape arranged along the first direction and the edge of the second battery string is a second distance, n is a positive integer and n ≤ i, where i is the minimum value of the total number of the first solder tapes and the total number of the second solder tapes, and all the first distances are different from the second distances.

[0009] Optionally, the edge lines of the first battery string and the second battery string extending along the second direction are collinear, the first solder tape includes a first part, a second part and a third part, the first part and the second part are parallel and extend along the second direction, one end of the first part is connected to one end of the second part through the third part, the other end of the first part is the first end of the first solder tape, the other end of the second part is the second end of the first solder tape, the second solder tape includes a fourth part, a fifth part and a sixth part, the fourth part and the fifth part are parallel and extend along the second direction, one end of the fourth part is connected to one end of the fifth part through the sixth part, the other end of the fourth part is the first end of the second solder tape, the other end of the fifth part is the second end of the second solder tape, the first part and the fourth part are alternately arranged at intervals along the first direction, and the second part and the fifth part are collinear.

[0010] Optionally, the bus bar includes a front surface and a back surface, at least part of the first ends of the first solder tapes are located on the front surface of the bus bar, and at least part of the first ends of the second solder tapes are located on the back surface of the bus bar.

[0011] Optionally, among the plurality of the first solder tapes arranged along the first direction, the first ends of the first solder tapes with odd sorting are located on the front surface of the bus bar, and the first solder tapes with even sorting are located on the back surface of the bus bar. Among the plurality of the second solder tapes arranged along the first direction, the first ends of the second solder tapes with odd sorting are located on the back surface of the bus bar, and the first ends of the second solder tapes with even sorting are located on the front surface of the bus bar. The first ends of the first solder tapes and the first ends of the second solder tapes located on the front surface of the bus bar are alternately arranged at intervals along the first direction, and the first ends of the first solder tapes and the first ends of the second solder tapes located on the back surface of the bus bar are alternately arranged at intervals along the first direction.

[0012] Optionally, the first ends of all the first solder tapes are located on the front surface of the bus bar, and the first ends of all the second solder tapes are located on the back surface of the bus bar.

[0013] Optionally, the first ends of the first solder tapes and the first ends of the second solder tapes are located on the same surface of the bus bar, and the photovoltaic module further includes: a plurality of conductive structures, the first solder tapes and the second solder tapes adjacent to each other along the first direction correspond to the conductive structures one by one, and the conductive structures cover the surfaces of the first ends of the corresponding first solder tapes and the surfaces of the first ends of the corresponding second solder tapes.

[0014] Optionally, the first end of the first solder tape is a first special-shaped end, the first end of the second solder tape is a second special-shaped end, and the first special-shaped end and the second special-shaped end are adapted and connected by solder.

[0015] Optionally, both the first special-shaped end and the second special-shaped end can be one of the following: a step structure, a ramp structure, and an irregular structure with a surface number greater than 3.

[0016] Optionally, the surface of the bus bar has a plurality of first grooves on the side close to the first battery string and a plurality of second grooves on the side close to the second battery string. The plurality of first grooves are arranged at intervals along the first direction, the plurality of second grooves are arranged at intervals along the first direction, the first ends of the first solder tapes are in contact with the solder on the bottom and side surfaces of the corresponding first grooves one by one, and the first ends of the second solder tapes are in contact with the solder on the bottom and side surfaces of the corresponding second grooves one by one.

[0017] The technical solution of the present application achieves the following beneficial technical effects: In the photovoltaic module of the present application, the first battery string and the second battery string are arranged at intervals on both sides of the bus bar. The first ends of multiple first solder tapes are connected to the bus bar and the second ends are connected to the first battery string, and the current collection of the first battery string is realized through the first solder tape. The first ends of multiple second solder tapes are connected to the bus bar and the second ends are connected to the second battery string, and the current collection of the second battery string is realized through the second solder tape, and it satisfies that the first solder tape and the second solder tape are arranged at intervals on the bus bar and there is no overlap between them, and / or it satisfies that the first solder tape and the second solder tape are overlapped and welded on the bus bar, and the overlapping area between them is larger than the contact area between the solder tape and the bus bar. Compared with the overlapping welding setting method, in the non-overlapping welding setting method of the present application, the end portions of the solder tapes directly welded to the bus bar in an alternating interval manner have solder not only on the bottom surface in contact with the bus bar, but also on the side surfaces. The solder can fully wrap the end portions of the solder tapes, so that the contact area between the solder tapes and the solder is relatively large, thereby enhancing the welding tensile force of the solder tapes and ensuring relatively high welding reliability; in addition, for the overlapped solder tapes, in the present application, by setting the overlapping area of the end portions of the overlapped solder tapes to be larger than the contact area between the solder tape and the bus bar, the contact area between the solder tape on the upper layer and the solder is relatively large, realizing the improvement of the welding tensile force and ensuring relatively high welding reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings forming a part of this application are used to provide a further understanding of the application. The schematic embodiments and descriptions thereof of the application are used to explain the application and do not constitute an improper limitation to the application. In the drawings:

[0019] Figure 1 FIG. 9 shows a partial structural schematic diagram of a first photovoltaic module according to an embodiment of the present application;

[0020] Figure 2 FIG. 13 shows a Figure 1 cross-sectional structural schematic diagram obtained along the dashed line AA' of

[0021] Figure 3 FIG. 19 shows a partial structural schematic diagram of a second photovoltaic module according to an embodiment of the present application;

[0022] Figure 4 FIG. 23 shows a Figure 3 partial cross-sectional structural schematic diagram obtained along the dashed line BB' of

[0023] Figure 5 FIG. 29 shows a partial structural schematic diagram of a third photovoltaic module according to an embodiment of the present application;

[0024] Figure 6 FIG. 33 shows a partial structural schematic diagram of a fourth photovoltaic module according to an embodiment of the present application;

[0025] Figure 7 Shows a partial structural schematic diagram of a fifth photovoltaic module according to an embodiment of the present application;

[0026] Figure 8 Shows a partial structural schematic diagram of a sixth photovoltaic module according to an embodiment of the present application;

[0027] Figure 9 Shows a partial structural schematic diagram of a seventh photovoltaic module according to an embodiment of the present application;

[0028] Figure 10 Shows along Figure 9 A partial cross-sectional structural schematic diagram obtained along the dashed line CC';

[0029] Figure 11 Shows a partial structural schematic diagram of an eighth photovoltaic module according to an embodiment of the present application;

[0030] Figure 12 Shows a partial structural schematic diagram of a ninth photovoltaic module according to an embodiment of the present application;

[0031] Figure 13 Shows a partial structural schematic diagram of a tenth photovoltaic module according to an embodiment of the present application;

[0032] Figure 14 Shows a partial structural schematic diagram of an eleventh photovoltaic module according to an embodiment of the present application;

[0033] Figure 15 Shows a partial structural schematic diagram of a twelfth photovoltaic module according to an embodiment of the present application;

[0034] Figure 16 Shows a partial structural schematic diagram of a thirteenth photovoltaic module according to an embodiment of the present application;

[0035] Figure 17 Shows a partial structural schematic diagram of a fourteenth photovoltaic module according to an embodiment of the present application;

[0036] Figure 18 Shows a partial structural schematic diagram of a fifteenth photovoltaic module according to an embodiment of the present application.

[0037] Among them, the above-mentioned drawings include the following reference numerals:

[0038] 10. Bus bar; 11. First battery string; 12. Second battery string; 13. First solder tape; 14. Second solder tape; 15. First solar cell; 16. Second solar cell; 17. First part; 18. Second part; 19. Third part; 20. Fourth part; 21. Fifth part; 22. Sixth part; 23. First groove; 24. Second groove; 25. Solder; 26. Conductive structure. Detailed implementation manners

[0039] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0041] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data may be interchanged under appropriate circumstances so as to describe the embodiments of the present application here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these process, method, product or device.

[0042] The present application will be further described in detail below in combination with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present application.

[0043] The inventor found that in existing photovoltaic modules, two solder tapes are overlapped and welded on the bus bar, the solder layer cannot fully wrap the upper solder tape, and the solder tapes are prone to dislocation problems during overlapping welding. These problems result in a small welding tensile force of the upper solder tape and poor welding reliability.

[0044] As introduced in the background art and the above content, there are problems with poor welding reliability in existing photovoltaic modules. To solve the above technical problems, an embodiment of the present application provides a photovoltaic module.

[0045] An embodiment of the present application provides a photovoltaic moduleFigure 1 and Figure 14 Exemplarily shown is a partial structural schematic diagram of two photovoltaic modules according to an embodiment of the present application, Figure 2 which is a cross-sectional structural schematic diagram obtained by the dashed line AA' along Figure 1 and Figure 14 ; and Figure 3 and Figure 15 Exemplarily shown is a partial structural schematic diagram of another two photovoltaic modules according to an embodiment of the present application, Figure 4 which is a cross-sectional structural schematic diagram obtained by the dashed line BB’ along Figure 3 and Figure 15 . As shown in Figures 1 to 4 , Figure 14 and Figure 15 , the above-mentioned photovoltaic module includes:

[0046] A bus bar 10 extending in a first direction;

[0047] A first cell string 11 and a second cell string 12 respectively located on both sides of the bus bar 10 along a second direction, the first direction intersecting the second direction;

[0048] Specifically, the bus bar is used to collect the current generated by the first cell string 11 and the second cell string 12 and transmit the collected current outside the photovoltaic module. The first direction may specifically be perpendicular to the second direction.

[0049] A plurality of first solder tapes 13, the plurality of first solder tapes 13 being arranged at intervals along the first direction, the first solder tapes 13 extending along the second direction, a first end of each first solder tape 13 being connected to the bus bar 10, and a second end of each first solder tape 13 being connected to the first cell string 11;

[0050] Specifically, the first solder tape 13 is used to connect photovoltaic cells to form the first cell string 11. While connecting the cells, it is also used to export the current generated by the cells in the first cell string 11 so that it can be transmitted along the first solder tape 13 to the bus bar 10.

[0051] A plurality of second solder tapes 14, the plurality of second solder tapes 14 being arranged at intervals along the first direction, the second solder tapes 14 extending along the second direction, a first end of the second solder tape 14 being connected to the bus bar 10, and a second end of the second solder tape 14 being connected to the second cell string 12;

[0052] Specifically, the second solder tape 14 is used to connect photovoltaic cells to form the second cell string 12. While connecting the cells, it is also used to export the current generated by the cells in the second cell string 12 so that it can be transmitted along the second solder tape 14 to the bus bar 10.

[0053] The above photovoltaic module satisfies at least one of the following: as Figure 1 , Figure 2 and Figure 14 shown, the first end of the first solder strip 13 overlaps with the first end of the second solder strip 14, and the overlapping area is greater than the target area, where the target area is the contact area between the first end of the first solder strip 13 and the bus bar 10 or the contact area between the first end of the second solder strip 14 and the bus bar 10; as Figure 3 , Figure 4 and Figure 15 shown, the first ends of the first solder strip 13 and the second solder strip 14 are arranged at intervals.

[0054] Specifically, when the first end of the first solder strip 13 overlaps with the first end of the second solder strip 14, the first end of the first solder strip 13 and the first end of the second solder strip 14 are stacked on the bus bar 10, and the overlapping area refers to the contact area between the first end of the first solder strip 13 and the first end of the second solder strip 14. When the first end of the first solder strip 13 is located between the first end of the second solder strip 14 and the bus bar 10, the overlapping area being greater than the target area means that the contact area between the first end of the first solder strip 13 and the first end of the second solder strip 14 is greater than the contact area between the first end of the first solder strip 13 and the bus bar 10; when the first end of the first solder strip 13 is located on the surface of the first end of the second solder strip 14 away from the bus bar 10, the overlapping area being greater than the target area means that the contact area between the first end of the first solder strip 13 and the first end of the second solder strip 14 is greater than the contact area between the first end of the second solder strip 14 and the bus bar 10. When the first ends of the first solder strip 13 and the second solder strip 14 are arranged at intervals, the first end of the first solder strip 13 and the first end of the second solder strip 14 do not overlap on the bus bar 10.

[0055] Through the above embodiments, in the photovoltaic module of the present application, the first battery string and the second battery string are arranged at intervals on both sides of the bus bar. The first ends of multiple first solder tapes are connected to the bus bar and the second ends are connected to the first battery string, and the current collection of the first battery string is realized through the first solder tape. The first ends of multiple second solder tapes are connected to the bus bar and the second ends are connected to the second battery string, and the current collection of the second battery string is realized through the second solder tape, and it satisfies: the first solder tape and the second solder tape are arranged at intervals on the bus bar, and there is no overlap between the two, and / or, it satisfies: the first solder tape and the second solder tape are overlapped and welded on the bus bar, and the overlapping area of the two is larger than the contact area between the solder tape and the bus bar. Compared with the setting method of overlapping welding, the setting method of the solder tapes that do not overlap in the present application is that the ends of the solder tapes directly welded on the bus bar in an alternating interval manner have solder not only on the bottom surface in contact with the bus bar, but also on the side surface. The solder can fully wrap the ends of the solder tapes, so that the contact area between the solder tape and the solder is larger, thereby enhancing the welding tensile force of the solder tape and ensuring relatively high welding reliability; in addition, for the overlapping solder tapes, in the present application, by setting the overlapping area of the ends of the overlapping solder tapes to be larger than the contact area between the solder tape and the bus bar, the contact area between the solder tape stacked on the upper layer and the solder is larger, realizing the improvement of the welding tensile force and ensuring relatively high welding reliability.

[0056] It should be noted that the above-mentioned overlap and contact both refer to the overlap and contact realized by the solder tape through solder. The material of the above-mentioned solder can be tin-lead solder, lead-free tin solder, lead-antimony solder, silver-copper solder, silver-zinc solder, copper-zinc solder, etc.

[0057] Specifically, the above-mentioned first battery string 11 includes multiple serially connected first battery cells 15, the above-mentioned second battery string 12 includes multiple serially connected second battery cells 16, and the types of the above-mentioned first battery cells 15 and the above-mentioned second battery cells 16 include but are not limited to TOPcon battery cells, back contact battery cells, HJT battery cells, etc. Multiple above-mentioned first battery cells 15 are connected in series through multiple above-mentioned first solder tapes 13 to form the above-mentioned first battery string 11. Multiple above-mentioned second battery cells 16 are connected in series through multiple above-mentioned second solder tapes 14 to form the above-mentioned second battery string 12.

[0058] In an alternative solution, the above-mentioned first solder tape 13 and the above-mentioned second solder tape 14 can be flat solder tapes. For example, the size of the flat solder tape can be (0.6 ± 0.2 mm) * (0.25 ± 0.05 mm); in another alternative solution, the above-mentioned first solder tape 13 and the above-mentioned second solder tape 14 can be round wire solder tapes. For example, the diameter of the round wire solder tape can be 0.2 - 0.28 mm.

[0059] According to some embodiments of the present application, the above-mentioned first solder strip 13, the above-mentioned second solder strip 14, and the above-mentioned bus bar 10 are all components for transmitting current. The main functions of the first solder strip 13 and the second solder strip 14 are to transmit current, while the main function of the bus bar 10 is to collect current. Therefore, the bus bar 10 generally needs to have a stronger current-carrying capacity than the first solder strip 13 and the second solder strip 14. Structurally, it is manifested that the cross-sectional dimension of the bus bar 10 in the direction perpendicular to the first direction is larger than the cross-sectional dimensions of the first solder strip 13 and the second solder strip 14 in the direction perpendicular to the second direction. The bus bar 10, the first solder strip 13, and the second solder strip 14 are all composed of a base material and a coating provided on the base material. The main function of the base material is to conduct electricity, and the main function of the coating is to make the first solder strip 13, the second solder strip 14, and the bus bar 10 have solderability, so that the first solder strip 13 and the second solder strip 14 can be connected to the grid lines of the battery cell by welding, and the bus bar 10 can be connected to the first solder strip 13 and the second solder strip 14 by welding. The material of the base material can be copper, which has a low resistivity and a strong current-carrying capacity. The material of the coating can be a tin alloy, and the coating material is uniformly wrapped on the surface of the base material by processes such as electroplating, vacuum deposition, or spraying. The first solder strip 13, the second solder strip 14, and the bus bar 10 provided by the embodiments of the present application can be processed and manufactured in an integrally formed manner, thereby reducing subsequent welding steps, and the integral formation can improve the reliability of the connection between the first solder strip 13, the second solder strip 14, and the bus bar 10, so that they also have good electrical connection stability under a small connection area. For example, during processing, the base materials of the first solder strip 13 and the second solder strip 14 and the base material of the bus bar 10 can be produced in an integrally formed manner, and then a coating is provided on the surface of the base material to achieve integral formation.

[0060] In some other alternative embodiments, as Figure 3 , Figure 15 and Figure 5 shown, the edge lines of the above-mentioned first battery string 11 and the above-mentioned second battery string 12 extending in the above-mentioned second direction are parallel (as Figure 3 and Figure 15 shown, the edge line L1 of the first battery string 11 is parallel to the edge line L1 of the second battery string 12, and the edge line L2 of the first battery string 11 is parallel to the edge line L2 of the second battery string 12). In other words, the edges of the above-mentioned first battery string 11 and the above-mentioned second battery string 12 are not collinear, and the first battery string 11 and the second battery string 12 are alternately arranged on both sides of the bus bar 10 along the first direction; the first solder strip 13 and the second solder strip 14 are alternately arranged at intervals along the first direction, and the minimum distance between the nth first solder strip 13 arranged along the first direction and the edge of the first battery string 11 is the first distance ( Figure 3 , Figure 15 andFigure 5 Exemplarily, the first distance D1 corresponding to the second of the above-mentioned first solder tapes 13 is shown, and the minimum distance between the nth of the above-mentioned second solder tapes 14 arranged along the above-mentioned first direction and the edge of the above-mentioned second battery string 12 is the second distance ( Figure 3 、 Figure 15 and Figure 5 Exemplarily, the second distance D2 corresponding to the second of the above-mentioned second solder tapes 14 is shown, n is a positive integer and n ≤ i, where i is the minimum value of the total number of the above-mentioned first solder tapes 13 and the total number of the above-mentioned second solder tapes 14, and the above-mentioned photovoltaic module satisfies one of the following: As Figure 3 and Figure 15 shown, all of the above-mentioned first distances D1 are the same as the above-mentioned second distances D2, indicating that the positions of each first solder tape 13 on the first battery string 11 and the positions of each second solder tape 14 on the second battery string 12 are the same (such as Figure 3 and Figure 15 the position of the second first solder tape 13 in and is different from the position of the second second solder tape 14), that is, the arrangement of all the grid lines on the first battery string 11 is the same as the arrangement of all the grid lines on the second battery string 12; As Figure 5 shown, at least one of the above-mentioned first distances D1 is different from the above-mentioned second distance D2, indicating that the position of at least one first solder tape 13 on the first battery string 11 is different from the position of the corresponding second solder tape 14 on the second battery string 12 (such as Figure 5 the position of the second first solder tape 13 in is different from the position of the second second solder tape 14), that is, there is at least one grid line arrangement on the first battery string 11 that is different from the grid line arrangement on the second battery string 12.

[0061] In the above-mentioned embodiment, by arranging the first battery string 11 and the second battery string 12 in an interleaved manner and making the positions of all the first solder tapes 13 on the first battery string 11 and the positions of all the second solder tapes 14 on the second battery string 12 the same, it is further ensured that the first ends of the above-mentioned first solder tapes 13 and the first ends of the above-mentioned second solder tapes 14 can be as Figure 4They are arranged at intervals on the bus bar 10 as shown, so that the sides and the bottom surface of the first solder ribbon 13 and the second solder ribbon 14 are in contact with the solder 25. The contact areas between the first solder ribbon 13 and the solder 25, and between the second solder ribbon 14 and the solder are relatively large, thus further ensuring a relatively large welding tensile force between the solder ribbon and the bus bar 10 and relatively high welding reliability. Moreover, the same positions of the solder ribbons on the battery string make the layouts of the first battery string 11 and the second battery string 12 relatively unified, which is conducive to the standardized design of the battery string and convenient for the large-scale production of the battery string; or, by arranging the first battery string 11 and the second battery string 12 staggeredly and making the position of at least one first solder ribbon 13 on the first battery string 11 different from the position of the second solder ribbon 14 on the second battery string 12, the spaced arrangement of the first ends of the first solder ribbon 13 and the second solder ribbon 14 on the bus bar 10 is realized, thus further ensuring a relatively large welding tensile force between the solder ribbon and the bus bar 10 and relatively high welding reliability.

[0062] It should be noted that in the above embodiments, as Figure 3 and Figure 15 shown, there are two edge lines of the first battery string 11 extending in the second direction, which are L1 and L2 respectively. The minimum distance between the nth first solder ribbon 13 arranged in the first direction and the edge of the first battery string 11 refers to the smaller value of the distances between the nth first solder ribbon 13 and these two edge lines of the first battery string 11 respectively. Similarly, there are two edge lines of the second battery string 12 extending in the second direction. The minimum distance between the nth second solder ribbon 14 arranged in the first direction and the edge of the second battery string 12 refers to the smaller value of the distances between the nth second solder ribbon 14 and these two edge lines of the second battery string 12 respectively.

[0063] In some embodiments, as Figure 3 and Figure 15As shown, the distance D3 between the edge lines of the first cell string 11 and the second cell string 12 is less than or equal to 2 mm. That is to say, the misalignment distance of the first cell string 11 and the second cell string 12 in the first direction is less than or equal to 2 mm. For example, the distance can be 2 mm, 1.5 mm, 1 mm, or 0.5 mm, etc. In this embodiment, by limiting the misalignment distance between the first cell string 11 and the second cell string 12, the internal layout of the module is relatively compact, which can avoid the problem of the large external dimensions of the photovoltaic module. Moreover, by limiting the misalignment distance between the first cell string 11 and the second cell string 12, it is ensured that there is sufficient layout space for the cell strings, solder tapes, and bus bars 10 in the photovoltaic module, so that the edge distance between the solder tape and the bus bar 10 and the edge distance between the cell string and the bus bar 10 are not too small. It is ensured that when the first solder tape 13 and the second solder tape 14 are alternately arranged at intervals, there is enough creepage distance between the solder tape and the bus bar 10 and between the cell string and the bus bar 10, further ensuring electrical safety and avoiding the problem of current leakage caused by creepage. In addition, the limitation of the misalignment distance can also take into account the overall aesthetic requirements of the photovoltaic module.

[0064] In some other exemplary embodiments, as Figure 6 shown, the edge lines of the first cell string 11 and the second cell string 12 extending along the second direction are collinear. That is to say, the first cell string 11 and the second cell string 12 are aligned in the first direction and do not intersect. The first solder tape 13 and the second solder tape 14 are alternately arranged at intervals along the first direction. The minimum distance between the nth first solder tape 13 arranged along the first direction and the edge of the first cell string 11 is the first distance D1, and the minimum distance between the nth second solder tape 14 arranged along the first direction and the edge of the second cell string 12 is the second distance D2. n is a positive integer and n ≤ i, where i is the minimum value of the total number of the first solder tapes 13 and the total number of the second solder tapes 14. All the first distances D1 are different from the second distances D2, that is, the first distance D1 corresponding to the first solder tape 13 is different from the second distance D2 corresponding to the first second solder tape 14, the first distance D1 corresponding to the second first solder tape 13 is different from the second distance D2 corresponding to the second second solder tape 14, ……, the first distance D1 corresponding to the ith first solder tape 13 is different from the second distance D2 corresponding to the ith second solder tape 14.

[0065] In the above embodiments, the first battery string 11 and the second battery string 12 are arranged in alignment on both sides of the bus bar 10, and the positions of all the first solder tapes 13 on the first battery string 11 are different from the positions of all the second solder tapes 14 on the second battery string 12, so as to achieve the arrangement of the first ends of the first solder tapes 13 and the first ends of the second solder tapes 14 at intervals on the bus bar 10, thereby further ensuring a relatively large welding tensile force between the solder tapes and the bus bar 10 and a relatively high welding reliability. At the same time, the alignment arrangement makes the overall occupied space of the first battery string 11 and the second battery string 12 relatively small, and the internal space of the component can be utilized more effectively, making the internal layout of the component relatively compact, avoiding the problem of the relatively large external dimensions of the photovoltaic module, and also ensuring the aesthetics of the photovoltaic module.

[0066] In addition, in the above embodiments, the first solder tape 13 is a straight solder tape extending along the second direction, and the second solder tape 14 is also a straight solder tape extending along the second direction.

[0067] In some other embodiments, as Figure 7 and Figure 16 shown, the edge lines of the first battery string 11 and the second battery string 12 extending along the second direction are collinear. That is to say, the first battery string 11 and the second battery string 12 are arranged in alignment in the first direction. The first solder tape 13 includes a first part 17, a second part 18 and a third part 19. The first part 17 and the second part 18 are parallel and extend along the second direction. One end of the first part 17 is connected to one end of the second part 18 through the third part 19. The other end of the first part 17 is the first end of the first solder tape 13, and the other end of the second part 18 is the second end of the first solder tape 13. The second solder tape 14 includes a fourth part 20, a fifth part 21 and a sixth part 22. The fourth part 20 and the fifth part 21 are parallel and extend along the second direction. One end of the fourth part 20 is connected to one end of the fifth part 21 through the sixth part 22. The other end of the fourth part 20 is the first end of the second solder tape 14, and the other end of the fifth part 21 is the second end of the second solder tape 14. The first part 17 and the fourth part 20 are alternately arranged at intervals in the first direction, and the edge lines of the second part 18 and the fifth part 21 extending along the second direction are collinear.

[0068] In the above embodiments, the first solder strip 13 includes a first portion 17, a third portion 19, and a second portion 18 that are sequentially connected. The bent solder strip shape is formed by these three portions, namely the first portion 17, the third portion 19, and the second portion 18. The second solder strip 14 includes a fourth portion 20, a sixth portion 22, and a fifth portion 21 that are sequentially connected. The bent solder strip shape is formed by these three portions, namely the fourth portion 20, the sixth portion 22, and the fifth portion 21. The first portion 17 and the fourth portion 20 are both connected to the bus bar 10 and are alternately arranged at intervals on the bus bar 10 to further ensure a large welding tensile force between the solder strip and the bus bar 10, and further improve the welding reliability. The second portion 18 and the fifth portion 21 are both connected to the battery string and are collinear, ensuring that the positions of all the first solder strips 13 on the first battery string 11 are the same as the positions of all the second solder strips 14 on the second battery string 12, which can make the layout of the first battery string 11 and the second battery string 12 more unified, thus facilitating the standardized design of the battery string and the large-scale production of the battery string.

[0069] According to some embodiments of the present application, as Figures 8 to 11 、 Figure 17 and Figure 18 shown, the bus bar 10 includes a front surface and a back surface. At least a first end of at least a part of the first solder strip 13 is located on the front surface of the bus bar 10, and at least a first end of at least a part of the second solder strip 14 is located on the back surface of the bus bar 10. This design distributes the first ends of the first solder strip 13 and the second solder strip 14 on the front and back surfaces of the bus bar 10, and makes the first ends of the solder strips located on the front and back surfaces of the bus bar 10 satisfy one of the following: as Figure 11 shown, the first end of the first solder strip 13 overlaps with the first end of the second solder strip 14, and the overlapping area is greater than the target area; as Figure 8 、 Figure 9 、 Figure 10 、 Figure 17 and Figure 18 shown, the first ends of the first solder strip 13 and the second solder strip 14 are arranged at intervals and do not overlap. This can further ensure a large contact area between the solder strip and the bus bar 10 and a small contact resistance, and also ensure a large arrangement space for the first ends of multiple solder strips on the bus bar 10 and a high arrangement flexibility.

[0070] It should be noted that on the basis that at least a first end of at least a part of the first solder strip 13 is located on the front surface of the bus bar 10 and at least a first end of at least a part of the second solder strip 14 is located on the back surface of the bus bar 10, those skilled in the art can set the edge lines of the first battery string 11 and the second battery string 12 extending along the second direction to be parallel (as Figure 11As shown, the first battery string 11 and the second battery string 12 are arranged offset on both sides of the bus bar 10; those skilled in the art can also set the edge lines of the first battery string 11 and the second battery string 12 extending in the second direction to be collinear (such as Figure 8 , Figure 9 , Figure 17 and Figure 18 shown), that is, the first battery string 11 and the second battery string 12 are aligned on both sides of the bus bar 10.

[0071] In some exemplary embodiments, as Figure 9 and Figure 18 shown, among the plurality of the first solder tapes 13 arranged in the first direction, the first ends of the first solder tapes 13 with odd serial numbers are located on the front surface of the bus bar 10, and the first solder tapes 13 with even serial numbers are located on the back surface of the bus bar 10. Among the plurality of the second solder tapes 14 arranged in the first direction, the first ends of the second solder tapes 14 with odd serial numbers are located on the back surface of the bus bar 10, and the first ends of the second solder tapes 14 with even serial numbers are located on the front surface of the bus bar 10. The first ends of the first solder tapes 13 and the first ends of the second solder tapes 14 located on the front surface of the bus bar 10 are alternately spaced along the first direction, and the first ends of the first solder tapes 13 and the first ends of the second solder tapes 14 located on the back surface of the bus bar 10 are alternately spaced along the first direction. In this embodiment, the adjacent solder tapes of the same battery string are connected to the front and back surfaces of the bus bar 10 in a vertically offset manner, so that the first end of each solder tape is directly in contact with the surface of the bus bar 10, and the bottom surface and side surface of the first end of the solder tape are wrapped by solder, further achieving the effect of increasing the contact area between the solder tape and the solder, thereby further ensuring relatively high welding reliability. Moreover, the method of welding the first solder tapes 13 with odd serial numbers and the second solder tapes 14 with even serial numbers to the front surface of the bus bar 10 and welding the remaining solder tapes to the back surface of the bus bar 10 can further ensure that there is a relatively large arrangement space for the ends of the solder tapes on the bus bar 10 and relatively high arrangement flexibility.

[0072] In some other exemplary embodiments, as Figure 11As shown, among the multiple first solder tapes 13 arranged along the first direction, the first ends of the first solder tapes 13 with odd serial numbers are located on the front surface of the bus bar 10, and the first solder tapes 13 with even serial numbers are located on the back surface of the bus bar 10. Among the multiple second solder tapes 14 arranged along the first direction, the first ends of the second solder tapes 14 with odd serial numbers are located on the back surface of the bus bar 10, and the first ends of the second solder tapes 14 with even serial numbers are located on the front surface of the bus bar 10. The first ends of the first solder tapes 13 and the first ends of the second solder tapes 14 located on the front surface of the bus bar 10 overlap, and the overlapping area is larger than the target area. The first ends of the first solder tapes 13 and the first ends of the second solder tapes 14 located on the back surface of the bus bar 10 overlap, and the overlapping area is larger than the target area. In this embodiment, the adjacent solder tapes of the same battery string are connected to the front and back surfaces of the bus bar 10 in a vertically offset manner, and the ends of the first solder tapes 13 and the second solder tapes 14 on the front surface are overlapped and welded, and the ends of the first solder tapes 13 and the second solder tapes 14 on the back surface are overlapped and welded. The overlapping area of the overlapping ends of the solder tapes is larger than the contact area between the solder tape and the bus bar 10, further ensuring that the contact area between the solder tape stacked on the upper layer and the solder is relatively large, thereby further realizing the improvement of the welding tensile force and ensuring relatively high welding reliability. Moreover, compared with the method of connecting all the solder tapes to one side surface of the bus bar 10, in this embodiment, the ends of the solder tapes with odd serial numbers on the first battery string 11 and the ends of the solder tapes with even serial numbers on the second battery string 12 are connected to one side surface of the bus bar 10, and the ends of the solder tapes with even serial numbers on the first battery string 11 and the ends of the solder tapes with odd serial numbers on the second battery string 12 are connected to the other side surface of the bus bar 10, further ensuring that the arrangement space of the first ends of the solder tapes on the bus bar 10 is relatively large.

[0073] In some other exemplary embodiments, as Figure 8 and Figure 17 shown, the first ends of all the first solder tapes 13 are located on the front surface of the bus bar 10, and the first ends of all the second solder tapes 14 are located on the back surface of the bus bar 10. In this embodiment, all the solder tapes of the battery strings on both sides of the bus bar 10 are arranged on the front and back surfaces of the bus bar 10, so that the first end of each solder tape is directly in contact with the surface of the bus bar 10, and the bottom surface and the side surface of the first end of the solder tape are wrapped by solder, further achieving the effect of increasing the contact area between the solder tape and the solder, thereby further ensuring relatively high welding reliability.

[0074] In the above embodiments, the first ends of the first solder tapes 13 located on the front surface of the bus bar 10 are arranged at intervals along the first direction; the first ends of the second solder tapes 14 located on the back surface of the bus bar 10 are arranged at intervals along the first direction.

[0075] In some exemplary embodiments, as Figure 12 shown, the first end of the first solder strip 13 and the first end of the second solder strip 14 are located on the same surface of the bus bar 10. The photovoltaic module further includes: a plurality of conductive structures 26. The first solder strip 13 and the second solder strip 14 adjacent to each other in the first direction correspond to the conductive structures 26 one by one. The conductive structures 26 cover the surface of the first end of the corresponding first solder strip 13 and the surface of the first end of the corresponding second solder strip 14. In this embodiment, after the solder strip is welded to the bus bar 10, the conductive structure 26 is used to fix the surface of the solder strip, thereby improving the welding tensile force.

[0076] Furthermore, the material of the conductive structure 26 includes, but is not limited to, one or more of silver epoxy conductive adhesive, gold epoxy conductive adhesive, copper epoxy conductive adhesive, carbon-based conductive adhesive, and conductive silicone.

[0077] In some embodiments, as Figure 2 shown, the first end of the first solder strip 13 is a first special-shaped end, and the first end of the second solder strip 14 is a second special-shaped end. The first special-shaped end and the second special-shaped end are adapted to each other and are connected by solder 25. Compared with the overlap between the rectangular surfaces of the non-special-shaped ends of the solder strips, in this embodiment, by setting the first end of the first solder strip 13 and the first end of the second solder strip 14 as special-shaped ends and the two being adapted to each other, it can be ensured that the contact area between the special-shaped surface of the end of the first solder strip 13 and the solder 25 is relatively large, and it can be ensured that the contact area between the special-shaped surface of the end of the second solder strip 14 and the solder 25 is relatively large, thereby further ensuring that the welding tensile force of the solder strip is relatively strong.

[0078] Specifically, the first special-shaped end and the second special-shaped end refer to the ends of the solder strip that have been specially designed or deformed relative to the conventional shape or structure. Here, "special-shaped" means that the end shape or structure of the solder strip is different from that of a straight or standard solder strip end, but adopts a certain special shape to meet specific welding requirements or optimize the performance of the module. The above-mentioned adaptation means that the first special-shaped end and the second special-shaped end match each other in shape, size, and interface and can be effectively combined together.

[0079] Figure 2 An embodiment in which both the first special-shaped end and the second special-shaped end are stepped structures is exemplarily shown. In the actual application process, the first special-shaped end and the second special-shaped end are not limited to the illustrated stepped structure.

[0080] Optionally, both the first special-shaped end and the second special-shaped end can be one of the following: a stepped structure, a ramp structure, and an irregular structure with a surface number greater than 3.

[0081] It should be noted that in the case where the first special-shaped end is a stepped structure, the second special-shaped end is also a stepped structure, and the surface in contact between the first special-shaped end and the second special-shaped end is a stepped surface; in the case where the first special-shaped end is a ramp structure, the second special-shaped end is also a ramp structure, and the surface in contact between the first special-shaped end and the second special-shaped end is the inclined surface of the ramp structure; in the case where the first special-shaped end is an irregular structure with more than 3 surfaces, the second special-shaped end is also an irregular structure with more than 3 surfaces, and the surface in contact between the first special-shaped end and the second special-shaped end is a surface with more than 3 surfaces.

[0082] In some embodiments, as Figure 13 shown, on the surface of the above-mentioned bus bar 10, there are a plurality of first grooves 23 close to the first battery string 11 side and a plurality of second grooves 24 close to the second battery string 12 side. The plurality of first grooves 23 are arranged at intervals along the first direction, and the plurality of second grooves 24 are arranged at intervals along the first direction. The first ends of the first solder tapes 13 are in contact with the solder on the bottom and side surfaces of the first grooves 23 one by one, and the first ends of the second solder tapes 14 are in contact with the solder on the bottom and side surfaces of the second grooves 24 one by one. In this embodiment, the contact area between the first solder tape 13 and the bus bar 10 is increased through the first groove 23, and the contact area between the second solder tape 14 and the bus bar 10 bracket is increased through the second groove 24, so as to further achieve the effect of improving the welding tensile force of the solder tape, further ensure the welding reliability, and further avoid welding defects such as virtual soldering, hidden cracks, and insufficient strength between the solder tape and the bus bar 10.

[0083] In some embodiments of the present application, at least some of the first grooves 23 and at least some of the second grooves 24 may be located on different surfaces of the bus bar 10. For example, all of the first grooves 23 are located on the front surface of the bus bar 10, and all of the second grooves 24 are located on the back surface of the bus bar 10. Another example is that some of the first grooves 23 and some of the second grooves 24 are located on the front surface of the bus bar 10, and the remaining first grooves 23 and the remaining second grooves 24 are located on the back surface of the bus bar 10.

[0084] Exemplarily, among the plurality of the first solder tapes 13 arranged along the first direction, the first grooves 23 corresponding to the first solder tapes 13 with odd sorting are located on the front surface of the bus bar 10, and the first grooves 23 corresponding to the first solder tapes 13 with even sorting are located on the back surface of the bus bar 10. Among the plurality of the second solder tapes 14 arranged along the first direction, the second grooves 24 corresponding to the second solder tapes 14 with odd sorting are located on the back surface of the bus bar 10, and the second grooves 24 corresponding to the second solder tapes 14 with even sorting are located on the front surface of the bus bar 10.

[0085] In some embodiments, as Figure 13 shown, the first grooves 23 and the second grooves 24 may be arranged at intervals. In some other embodiments, the first grooves 23 and the second grooves 24 may penetrate through in one-to-one correspondence, and the first ends of the first solder tape 13 and the second solder tape 14 are stacked in the penetrating grooves. In some other embodiments, the first grooves 23 and the second grooves 24 may penetrate through in one-to-one correspondence, and the first ends of the first solder tape 13 and the second solder tape 14 are located in the penetrating grooves at intervals along the second direction.

[0086] In the actual application process, as Figure 3 shown, there may be multiple first cell strings 11 on one side of the bus bar 10, and the multiple first cell strings 11 are arranged along the first direction; there may be multiple second cell strings 12 on the other side of the bus bar 10, and the multiple second cell strings 12 are arranged along the first direction.

[0087] Through experimental verification, in the photovoltaic module of the present application, the welding tensile forces of the first solder tape 13 and the second solder tape 14 after being welded to the bus bar 10 can meet the requirement of being greater than 4N.

[0088] This embodiment does not limit the structure of the cell. The types of cells include but are not limited to Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Heterojunction with Intrinsic Thin-film (HJT), Interdigitated Back Contact (IBC), perovskite cells, etc.

[0089] For a PERC cell, along its thickness direction, the PERC cell sequentially includes a front surface metal silver electrode, a front surface silicon nitride passivation layer, a phosphorus layer emitter, a P-type substrate silicon layer, a local aluminum back surface field, a metal aluminum back electrode, and a back passivation layer (Al2O3 / SiN X ). The PERC cell uses a passivation film to passivate the back surface, replacing the full aluminum back surface field, enhancing the internal back reflection of light in the silicon substrate, reducing the back surface recombination rate, and increasing the efficiency of the cell by 0.5%-1%.

[0090] For a TOPCon cell, along its thickness direction, the TOPCon cell sequentially includes a metal silver electrode, a front surface silicon nitride passivation layer, a boron-doped emitter, an N-type substrate silicon layer, a diffusion doping layer, an ultra-thin silicon oxide, a doped polycrystalline silicon, silicon nitride, and a metal silver electrode. The back surface of the cell is composed of an ultra-thin silicon oxide layer (1nm - 2nm) and a phosphorus-doped microcrystalline amorphous hybrid Si thin film, and the two together form a passivated contact structure. This structure can block the recombination of minority carriers holes, improving the open-circuit voltage and short-circuit current of the cell. The ultra-thin oxide layer allows majority carriers electrons to tunnel into the polycrystalline silicon layer while blocking the recombination of minority carriers holes. The good passivation effect of the ultra-thin silicon oxide and the heavily doped silicon thin film causes the energy band on the silicon wafer surface to bend, thus forming a field passivation effect, greatly increasing the probability of electron tunneling, decreasing the contact resistance, improving the open-circuit voltage and short-circuit current of the cell, and thus increasing the conversion efficiency of the cell.

[0091] For an HJT cell, along its thickness direction, the HJT cell sequentially includes a front surface low-temperature silver electrode, a front surface conductive thin film, an N-type amorphous silicon thin film, an intrinsic amorphous silicon thin film, an N-type substrate silicon layer, an intrinsic amorphous silicon thin film, a P-type amorphous silicon thin film, a back surface conductive thin film, and a back surface low-temperature silver electrode.

[0092] For an IBC cell, along its thickness direction, the IBC cell sequentially includes a silicon nitride anti-reflection layer, an N+ front surface field, an N-type substrate silicon layer, a P+ emitter, an N+ back surface field, an aluminum oxide passivation layer, a silicon nitride anti-reflection layer, and a metal silver electrode. The IBC cell uses ion implantation technology to obtain P regions and N regions with good uniformity and precisely controllable junction depth. There are no grid lines blocking on the front surface of the cell, which can eliminate the shading current loss of the metal electrodes and achieve the maximum utilization of incident photons. The short-circuit current can be increased by about 7% compared with conventional solar cells; due to the back contact structure, there is no need to consider the problem of grid line shading, the grid line ratio can be appropriately widened, thereby reducing the series resistance and having a high fill factor; the surface passivation and surface light trapping structure can be optimized, and a lower front surface recombination rate and surface reflection can be obtained.

[0093] For perovskite solar cells, along their thickness direction, perovskite solar cells sequentially include a substrate material, a conductive thin film, an electron transport layer (titanium dioxide), a perovskite absorption layer (hole transport layer), and a metal cathode. Perovskite materials have a high light absorption coefficient and a long carrier diffusion distance. After the photons absorbed by perovskite materials are converted into electrons, they can be easily collected by the electrodes with less loss. Therefore, a high photo-generated voltage and current can be generated, making perovskite exhibit a high photoelectric conversion efficiency.

[0094] In this application, Figure 1 、 Figure 3 、 Figures 5 to 9 and Figures 11 to 13 exemplarily show the series design scheme of the back-contact cell; Figures 14 to 18 exemplarily show the series design scheme of the TOPcon cell. In these figures, Figure 1 In the Figure 14 photovoltaic module, the connection method between the solder tape and the bus bar is the same, and the relative positional relationship between the solder tapes and the relative positional relationship between the first cell string and the second cell string are also the same. Figure 2 FIG. Figure 1 and Figure 14 is a schematic cross-sectional structure diagram obtained along the AA' dotted line of Figure 3 In the Figure 15 photovoltaic module, the connection method between the solder tape and the bus bar is the same, and the relative positional relationship between the solder tapes and the relative positional relationship between the first cell string and the second cell string are also the same. Figure 4 FIG. Figure 3 and Figure 15 is a schematic cross-sectional structure diagram obtained along the BB' dotted line of Figure 7 In the Figure 16 photovoltaic module, the connection method between the solder tape and the bus bar is the same, and the relative positional relationship between the solder tapes and the relative positional relationship between the first cell string and the second cell string are also the same; Figure 8 In the Figure 17 photovoltaic module, the connection method between the solder tape and the bus bar is the same, and the relative positional relationship between the solder tapes and the relative positional relationship between the first cell string and the second cell string are also the same; Figure 9 In the Figure 18 photovoltaic module, the connection method between the solder tape and the bus bar is the same, and the relative positional relationship between the solder tapes and the relative positional relationship between the first cell string and the second cell string are also the same. Figure 10 FIG. Figure 9 and Figure 18 is a schematic cross-sectional structure diagram obtained along the CC' dotted line of

[0095] In addition, Figure 5 、 Figure 6 、 Figures 11 to 13There is also a corresponding series connection design solution for TOPcon solar cells, which will not be exemplified one by one in this application.

[0096] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0097] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0098] In the photovoltaic module of the present application, the first battery string and the second battery string are arranged at intervals on both sides of the bus bar. The first ends of multiple first solder tapes are connected to the bus bar and the second ends are connected to the first battery string, and the current collection of the first battery string is realized through the first solder tape. The first ends of multiple second solder tapes are connected to the bus bar and the second ends are connected to the second battery string, and the current collection of the second battery string is realized through the second solder tape, and it satisfies that: the first solder tape and the second solder tape are arranged at intervals on the bus bar and do not overlap with each other, and / or, it satisfies that: the first solder tape and the second solder tape are overlapped and welded on the bus bar, and the overlapping area of the two is larger than the contact area between the solder tape and the bus bar. Compared with the overlapping welding setting method, in the setting method of the non-overlapping solder tapes in the present application, the end parts of the solder tapes directly welded on the bus bar in an alternating interval manner have solder not only on the bottom surface in contact with the bus bar, but also on the side surface. The solder can fully wrap the end parts of the solder tapes, so that the contact area between the solder tapes and the solder is larger, thereby enhancing the welding tensile force of the solder tapes and ensuring relatively high welding reliability; in addition, for the overlapping solder tapes, in the present application, by setting the overlapping area of the end parts of the overlapping solder tapes to be larger than the contact area between the solder tape and the bus bar, the contact area between the solder tape on the upper layer and the solder is larger, realizing the improvement of the welding tensile force and ensuring relatively high welding reliability.

[0099] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module, characterized in that, Comprising: A bus bar extending along a first direction; A first battery string and a second battery string respectively located on both sides of the bus bar along a second direction, the first direction intersecting with the second direction; A plurality of first solder tapes, the plurality of first solder tapes being arranged at intervals along the first direction, the first solder tapes extending along the second direction, the first end of each first solder tape being connected to the bus bar, and the second end of each first solder tape being connected to the first battery string; A plurality of second solder tapes, the plurality of second solder tapes being arranged at intervals along the first direction, the second solder tapes extending along the second direction, the first end of the second solder tape being connected to the bus bar, and the second end of the second solder tape being connected to the second battery string; The photovoltaic module satisfies at least one of the following: The first end of the first solder tape overlaps with the first end of the second solder tape, and the overlapping area is greater than a target area, the target area being the contact area between the first end of the first solder tape and the bus bar or the contact area between the first end of the second solder tape and the bus bar; The first ends of the first solder tape and the second solder tape are arranged at intervals.

2. The photovoltaic module according to claim 1, wherein The edge lines of the first battery string and the second battery string extending along the second direction are parallel, the first solder tapes and the second solder tapes are alternately arranged at intervals along the first direction, the minimum distance between the nth first solder tape arranged along the first direction and the edge of the first battery string is a first distance, and the minimum distance between the nth second solder tape arranged along the first direction and the edge of the second battery string is a second distance, where n is a positive integer and n ≤ i, and i is the minimum value of the total number of the first solder tapes and the total number of the second solder tapes. The photovoltaic module satisfies one of the following: All of the first distances are the same as the second distances; At least one of the first distances is different from the second distances.

3. The photovoltaic module according to claim 2, wherein, The distance between the edge lines of the first battery string and the second battery string is less than or equal to 2 mm.

4. The photovoltaic module according to claim 1, wherein The edge lines of the first battery string and the second battery string extending along the second direction are collinear, the first solder tapes and the second solder tapes are alternately arranged at intervals along the first direction, the minimum distance between the nth first solder tape arranged along the first direction and the edge of the first battery string is a first distance, and the minimum distance between the nth second solder tape arranged along the first direction and the edge of the second battery string is a second distance, where n is a positive integer and n ≤ i, and i is the minimum value of the total number of the first solder tapes and the total number of the second solder tapes. All of the first distances are different from the second distances.

5. The photovoltaic module according to claim 1, wherein The edge lines of the first battery string and the second battery string extending along the second direction are collinear. The first solder strip includes a first part, a second part, and a third part. The first part and the second part are parallel and extend along the second direction. One end of the first part is connected to one end of the second part through the third part. The other end of the first part is the first end of the first solder strip, and the other end of the second part is the second end of the first solder strip. The second solder strip includes a fourth part, a fifth part, and a sixth part. The fourth part and the fifth part are parallel and extend along the second direction. One end of the fourth part is connected to one end of the fifth part through the sixth part. The other end of the fourth part is the first end of the second solder strip, and the other end of the fifth part is the second end of the second solder strip. The first part and the fourth part are alternately arranged at intervals along the first direction, and the second part and the fifth part are collinear.

6. The photovoltaic module according to claim 1, wherein The bus bar includes a front surface and a back surface. At least part of the first end of the first solder strip is located on the front surface of the bus bar, and at least part of the first end of the second solder strip is located on the back surface of the bus bar.

7. The photovoltaic module according to claim 6, wherein Among the multiple first solder strips arranged along the first direction, the first ends of the first solder strips with odd sorting are located on the front surface of the bus bar, and the first solder strips with even sorting are located on the back surface of the bus bar. Among the multiple second solder strips arranged along the first direction, the first ends of the second solder strips with odd sorting are located on the back surface of the bus bar, and the second solder strips with even sorting are located on the front surface of the bus bar. The first ends of the first solder strips and the first ends of the second solder strips located on the front surface of the bus bar are alternately arranged at intervals along the first direction, and the first ends of the first solder strips and the first ends of the second solder strips located on the back surface of the bus bar are alternately arranged at intervals along the first direction.

8. The photovoltaic module according to claim 6, characterized in that, All the first ends of the first solder strips are located on the front surface of the bus bar, and all the first ends of the second solder strips are located on the back surface of the bus bar.

9. The photovoltaic module according to claim 1, wherein The first end of the first solder strip and the first end of the second solder strip are located on the same surface of the bus bar. The photovoltaic module further includes: Multiple conductive structures, the first solder strip and the second solder strip adjacent to each other along the first direction correspond to the conductive structures one by one, and the conductive structures cover the surfaces of the first ends of the corresponding first solder strips and the surfaces of the first ends of the corresponding second solder strips.

10. The photovoltaic module according to claim 1, characterized in that, The first end of the first solder strip is a first special-shaped end, and the first end of the second solder strip is a second special-shaped end. The first special-shaped end and the second special-shaped end are adapted and connected by solder.

11. The photovoltaic module according to claim 10, wherein, The first special-shaped end and the second special-shaped end can both be one of the following: a stepped structure, a ramp structure, and an irregular structure with more than 3 surfaces.

12. The photovoltaic module according to claim 1, wherein, On the surface of the bus bar, there are a plurality of first grooves near the first battery string side and a plurality of second grooves near the second battery string side. The plurality of first grooves are arranged at intervals along the first direction, and the plurality of second grooves are arranged at intervals along the first direction. The first end of the first solder tape is in contact with the solder on the bottom and side surfaces of the first groove one by one, and the first end of the second solder tape is in contact with the solder on the bottom and side surfaces of the second groove one by one.

Images