Photovoltaic module

Abstract

The utility model discloses a photovoltaic assembly. The photovoltaic assembly comprises a plurality of battery string groups, a plurality of first bus bars, a plurality of second bus bars and at least one third bus bar. The plurality of battery string groups are only arranged along a first direction and are connected in series, each battery string group comprises three battery strings connected in parallel, the plurality of first bus bars are continuously arranged at a first end, and the plurality of second bus bars are discontinuously arranged along the first direction; the third bus bar extends in a second direction of the battery string group. And through the design that the third bus bar extends along the second direction, when the battery string group has a hot spot effect, the current of the battery string group can be reasonably shunted, the influence of non-uniform distribution of the current on the photovoltaic module is reduced, the service life of the photovoltaic module is prolonged, and the reliability of the photovoltaic module is improved. And meanwhile, the third bus bar is arranged on the back surface of the battery string group, so that the all-black effect of the photovoltaic module is realized, the occupied space of the photovoltaic module is reduced, more battery strings can be arranged conveniently, and the output power of the photovoltaic module is improved.

Description

Technical Field

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

[0002] In existing technologies, the cell strings in photovoltaic modules are usually formed by connecting half cells in series, which results in a large current in a single cell string, leading to a large overall power loss in the photovoltaic module and a low output power. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the purpose of the present invention is to provide a photovoltaic module that can improve the output power of the photovoltaic module.

[0004] According to an embodiment of the present invention, the photovoltaic module includes: multiple battery string groups, multiple first busbars, multiple second busbars, and at least one third busbar. The multiple battery string groups are arranged in series only along a first direction, each battery string group includes three parallel battery strings, which are arranged only along the first direction and extend along a second direction. Each battery string includes multiple solar cells. The multiple first busbars extend along the first direction and are located at a first end of the battery string group along the second direction. The multiple first busbars are electrically connected to two adjacent battery string groups at the first end and are continuously arranged at the first end. The multiple second busbars extend along the first direction and are located at a second end of the battery string group along the second direction. The multiple second busbars are electrically connected to two adjacent battery string groups at the second end and are intermittently arranged along the first direction. The third busbar extends along the second direction of the battery string group.

[0005] According to the photovoltaic module of this utility model embodiment, the design of the third busbar extending along the second direction facilitates reasonable current distribution in the battery string group when hot spot effects occur, reducing the impact of uneven current distribution on the photovoltaic module, extending its service life, and improving its reliability. Simultaneously, the third busbar's location on the back of the battery string group helps achieve a completely black photovoltaic module, reducing space occupation and allowing for the installation of more battery strings, thereby increasing the module's output power.

[0006] In some embodiments, at least one of the first busbar and the second busbar is disposed on the back side of the battery string; and / or, at least one of the first busbar and the second busbar is disposed at the end of the battery string along the second direction, with the at least one of the first busbar and the second busbar spaced apart from the end adjacent to the battery string.

[0007] In some embodiments, the third busbar is disposed between two adjacent battery strings and extends along the second direction, one end of the third busbar is electrically connected to the first busbar, and the other end of the third busbar extends toward the second busbar.

[0008] In some embodiments, the third busbar is disposed on the back side of at least one of the battery strings included in at least one of the battery string groups and extends along the second direction, one end of the third busbar is electrically connected to the first busbar, and the other end of the third busbar extends toward the second busbar.

[0009] In some embodiments, the photovoltaic module further includes: a junction box disposed between two adjacent second busbars, the junction box including two diodes, the second busbars adjacent to the two diodes and the third busbars being electrically connected to the corresponding ends of the two diodes respectively, and the two diodes being connected in reverse parallel to the adjacent battery string.

[0010] In some embodiments, the junction box includes: a first connection terminal, a second connection terminal, and a third connection terminal, wherein the first connection terminal and the second connection terminal are spaced apart and are electrically connected to adjacent second busbars respectively; one of the two diodes is disposed between the first connection terminal and the third connection terminal, and the other of the two diodes is disposed between the second connection terminal and the third connection terminal; the other end of the third busbar is connected to the third connection terminal; one of the two diodes adjacent to the first connection terminal is connected in reverse parallel with the adjacent battery string, and the other of the two diodes adjacent to the second connection terminal is connected in reverse parallel with the adjacent battery string.

[0011] In some embodiments, the photovoltaic module further includes: busbar leads, wherein the second busbar and the third busbar are electrically connected to the adjacent junction box via the busbar leads.

[0012] In some embodiments, the shape of the projection of the junction box onto the battery cell is triangular, trapezoidal, or rectangular.

[0013] In some embodiments, the battery cell is a quarter-cell battery cell cut from a whole battery cell, and the first direction and the second direction are different.

[0014] In some embodiments, at least one of the first busbar and the second busbar is disposed on the back side of the battery string, and the photovoltaic module further includes: a first insulating member disposed between the first busbar and the second busbar and the battery cell; the battery string includes a plurality of first solder strips and a plurality of second solder strips, the currents collected by the first solder strips and the second solder strips having different polarities, the first insulating member being disposed between the first busbar and one of the first solder strips and the second solder strips, and the first insulating member being disposed between the second busbar and the other of the first solder strips and the second solder strips.

[0015] In some embodiments, the first insulating member includes a plurality of insulating strips spaced apart along the first direction; and / or, the first insulating member is formed with a plurality of openings, the first busbar being electrically connected at the opening to one of the first solder strip and the second solder strip, and the second busbar being electrically connected to the other of the first solder strip and the second solder strip.

[0016] In some embodiments, the width of the first busbar and the second busbar along the second direction is L1, wherein L1 satisfies: 4mm≤L1≤12mm; the height of the first busbar and the second busbar along the thickness direction of the battery cell is H1, wherein H1 satisfies: 0.1mm≤H1≤0.3mm.

[0017] In some embodiments, the photovoltaic module further includes a second insulating member disposed between the third busbar and the solar cell.

[0018] In some embodiments, the width of the third busbar along the first direction is L2, wherein L2 satisfies: 2mm≤L2≤8mm; the height of the third busbar along the thickness direction of the battery cell is H2, wherein H2 satisfies: 0.1mm≤H2≤0.3mm.

[0019] In some embodiments, along the second direction, two adjacent battery cells at least partially overlap, and the width of the overlapping portion is L3, wherein L3 satisfies: 0 < L3 ≤ 1 mm.

[0020] In some embodiments, each battery string includes N battery cells, where N satisfies: 30 ≤ N ≤ 35.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of an embodiment of the present invention, in which the first busbar and the second busbar are both located on the back of the battery string, and the third busbar is located between two adjacent battery strings;

[0024] Figure 2 This is a partial schematic diagram of an embodiment of the present invention, in which the second busbar is disposed on the back of the battery string and the third busbar is disposed between two adjacent battery strings;

[0025] Figure 3 This is a schematic diagram of the junction box according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of an embodiment of the present invention, in which the first busbar and the second busbar are both disposed on the back of the battery string group, and the third busbar is disposed on the back of the first battery string included in the first battery string group;

[0027] Figure 5 This is a partial schematic diagram of the third busbar located on the back of the first battery string according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of an embodiment of the present invention, in which the first busbar and the second busbar are respectively spaced apart from the ends adjacent to the battery string group, and the third busbar is disposed between two adjacent battery string groups;

[0029] Figure 7 This is a partial schematic diagram of an embodiment of the present invention, showing that the second busbar is spaced apart from the end of the battery string, and the third busbar is located between two adjacent battery strings.

[0030] Figure label:

[0031] 100. Photovoltaic modules;

[0032] 10. Battery string group; 11. First battery string group; 12. Second battery string group;

[0033] 20. Battery string; 21. First battery string; 22. Second battery string; 23. Battery cell; 24. First solder strip; 25. Second solder strip;

[0034] 30. First busbar; 31. First sub-busbar; 32. Second sub-busbar; 33. Second busbar; 34. Third sub-busbar; 35. Fourth sub-busbar; 36. Third busbar;

[0035] 40. First insulating component; 41. Second insulating component;

[0036] 50. Junction box; 51. Diode; 52. First diode; 53. Second diode; 54. First connection terminal; 55. Second connection terminal; 56. Third connection terminal;

[0037] 60. Busbar lead-out line; 61. First lead-out line; 62. Second lead-out line;

[0038] A. First direction; B. Second direction. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-3 The photovoltaic module 100 according to an embodiment of the present utility model includes: a plurality of battery string groups 10, a plurality of first busbars 30, a plurality of second busbars 33 and at least one third busbar 36.

[0040] Specifically, such as Figure 1 , Figure 4 and Figure 6 As shown, multiple battery string groups 10 are arranged and connected in series only along the first direction A. Each battery string group 10 includes three parallel battery strings 20, which are arranged only along the first direction A and extend along the second direction B. Each battery string 20 includes multiple battery cells 23. Multiple first busbars 30 extend along the first direction A and are located at the first end of the battery string group 10 along the second direction B. The multiple first busbars 30 are electrically connected to two adjacent battery string groups 10 at the first end and are continuously arranged at the first end. Multiple second busbars 33 extend along the first direction A and are located at the second end of the battery string group 10 along the second direction B. The multiple second busbars 33 are electrically connected to two adjacent battery string groups 10 at the second end and are intermittently arranged along the first direction A. A third busbar 36 extends along the second direction B of the battery string group 10. Wherein, the first direction A is the width direction of the photovoltaic module 100, the second direction B is the length direction of the photovoltaic module 100, and the first end and the second end are the beginning and end ends of the photovoltaic module 100 along the second direction B, respectively.

[0041] In this embodiment, the multiple battery string groups 10 include a first battery string group 11 and a second battery string group 12. The first battery string group 11 and the second battery string group 12 are arranged at intervals and connected in series along a first direction A. The first battery string group 11 includes three first battery strings 21, which extend along a second direction B and are arranged at intervals and connected in parallel along the first direction A. The second battery string group 12 includes three second battery strings 22, which extend along a second direction B and are arranged at intervals and connected in parallel along the first direction A. The first battery strings 21 and the second battery strings 22 both extend from a first end to a second end along the second direction B. The photovoltaic module 100 has only one battery string group 10 arranged along the second direction B, and the multiple battery strings 20 included in the multiple battery string groups 10 are arranged at intervals only along the first direction A.

[0042] The plurality of first busbars 30 include a first sub-busbar 31 and a second sub-busbar 32 extending along a first direction A. The first sub-busbar 31 is disposed on the back side of the first end of the first battery string group 11, and the second sub-busbar 32 is disposed on the back side of the second end of the second battery string group 12. The first sub-busbar 31 and the second sub-busbar 32 are connected to each other at their adjacent ends along the first direction A. The first sub-busbar 31 is electrically connected to the first battery string group 11 at its first end, and the second sub-busbar 32 is electrically connected to the second battery string group 12 at its first end. The plurality of second busbars 33 include a third sub-busbar 34 and a fourth sub-busbar 35 extending along the first direction A. The third sub-busbar 34 and the fourth sub-busbar 35 are spaced apart at their adjacent ends along the first direction A. The third sub-busbar 34 is disposed on the back side of the second end of the first battery string group 11, and the fourth sub-busbar 35 is disposed on the back side of the second end of the second battery string group 12. The third sub-busbar 34 is electrically connected to the first battery string group 11 at its second end, and the fourth sub-busbar 35 is electrically connected to the second battery string group 12 at its second end. The third busbar 36 is disposed between the first busbar 30 and the second busbar 33 along the second direction B.

[0043] According to the photovoltaic module 100 of this embodiment, the design of the third busbar 36 extending along the second direction B facilitates reasonable current distribution in the battery string group 10 when hot spot effect occurs, reducing the impact of uneven current distribution on the photovoltaic module 100, extending the service life of the photovoltaic module 100, and improving the reliability of the photovoltaic module 100. Simultaneously, the third busbar 36 is located on the back of the battery string group 10, which helps to achieve a completely black effect for the photovoltaic module 100, reducing the space occupied by the photovoltaic module 100, facilitating the installation of more battery strings 20, and increasing the output power of the photovoltaic module 100.

[0044] According to some embodiments of this utility model, such as Figure 1 and Figure 4As shown, at least one of the first busbar 30 and the second busbar 33 is located on the back side of the battery string assembly 10. In this embodiment, both the first busbar 30 and the second busbar 33 are located on the back side of the battery string assembly 10 along the thickness direction of the battery cell 23. The fourth sub-busbar 35 is connected to the output terminal of an external device, and the third sub-busbar 34 is connected to the input terminal of an external device. Current is input through the fourth sub-busbar 35 and flows sequentially through the second battery string assembly 12, the second sub-busbar 32, the first sub-busbar 31, and the first battery string assembly 11, and is finally output to the external device through the third sub-busbar 34. This avoids the first busbar 30 and the second busbar 33 obstructing the front side of the battery string assembly 10, increases the number of battery cells 23, improves the output power of the photovoltaic module 100, and makes the photovoltaic module 100 more aesthetically pleasing.

[0045] Optionally, such as Figure 6 As shown, at least one of the first busbar 30 and the second busbar 33 is disposed at the end of the battery string group 10 along the second direction B, and the at least one of the first busbar 30 and the second busbar 33 is spaced apart from the end of the battery string group 10 adjacent to it. In this embodiment, the first busbar 30 and the second busbar 33 are respectively disposed adjacent to the first end and the second end of the battery string group 10, and the first busbar 30 is spaced apart from the first end of the adjacent battery string group 10, and the second busbar 33 is spaced apart from the second end of the adjacent battery string group 10. The first busbar 30 and the second busbar 33 are disposed outside the battery string group 10 along the second direction B, and the projections of the first busbar 30 and the second busbar 33 along the thickness direction of the photovoltaic module 100 do not coincide with the projection of the battery string group 10 along the thickness direction of the photovoltaic module 100. Therefore, by arranging the first busbar 30 and the second busbar 33 at intervals with the battery string group 10 along the second direction B, the layout of the first busbar 30 and the second busbar 33 on the photovoltaic module 100 can be simplified, the yield of the photovoltaic module 100 can be improved, and the excessive thickness of the photovoltaic module 100 can be avoided by arranging the busbars along the thickness direction of the battery cell 23 on one side of the battery cell 23. This also improves the situation of cell cracking during the lamination of the photovoltaic module 100 and extends the service life of the photovoltaic module 100.

[0046] Optionally, one of the first busbar 30 and the second busbar 33 is disposed on the back side of the battery string assembly 10, and the other of the first busbar 30 and the second busbar 33 is disposed at the end of the battery string assembly 10 along the second direction B, and is spaced apart from the end adjacent to the battery string assembly 10.

[0047] According to some embodiments of this utility model, such as Figure 1 and Figure 6As shown, the third busbar 36 is disposed between two adjacent battery string groups 10 and extends along the second direction B. One end of the third busbar 36 is electrically connected to the first busbar 30, and the other end of the third busbar 36 extends toward the second busbar 33.

[0048] The third busbar 36 is disposed between two adjacent battery strings 20 of the first battery string group 11 and the second battery string group 12. The end of the third busbar 36 adjacent to the first busbar 30 along the second direction B forms an electrical connection with the first busbar 30. The other end of the second busbar 36, away from the first busbar 30 along the second direction B, extends toward the second busbar 33 and is spaced apart from the second busbar 33 along the second direction B. The third busbar 36 is made of black material so that the photovoltaic module 100 has an overall all-black appearance.

[0049] Therefore, by placing the third busbar 36 between two adjacent battery string groups 10, the position of the third busbar 36 relative to the battery string group 10 is optimized, reducing the space occupied by the third busbar 36, so that more battery cells 23 can be arranged in the same space, thereby increasing the power of the photovoltaic module 100. Furthermore, it allows the photovoltaic module 100 to have a symmetrical structure overall. Simultaneously, when some battery strings 20 exhibit hot spot effects, current can flow through the third busbar 36, ensuring that current does not flow to the battery strings 20 exhibiting hot spot effects, while simultaneously forming a complete current loop within the photovoltaic module 100.

[0050] According to some embodiments of the present invention, a third busbar 36 is disposed on the back side of at least one battery string 20 included in at least one battery string group 10 and extends along the second direction B. One end of the third busbar 36 is electrically connected to the first busbar 30, and the other end of the third busbar 36 extends toward the second busbar 33.

[0051] For example, combining Figure 4 The third busbar 36 is disposed on the back of the battery string 20 adjacent to the second battery string 12 in the first battery string group 11 along the thickness direction of the battery cell 23. That is, the third busbar 36 is spaced apart from the second battery string group 12 along the first direction A. One end of the third busbar 36 is electrically connected to the first sub-busbar 31, and the other end of the third busbar 36 extends toward the third sub-busbar 34 along the second direction B and is spaced apart from the third sub-busbar 34 along the second direction B.

[0052] Optionally, the third busbar 36 may be disposed along the thickness direction of the battery cell 23 on the back side of the battery string 20 adjacent to the first battery string 11 in the second battery string group 12. That is, the third busbar 36 is spaced apart from the first battery string group 11 along the first direction A. One end of the third busbar 36 is electrically connected to the second sub-busbar 32, and the other end of the third busbar 36 extends toward the fourth sub-busbar 35 along the second direction B and is spaced apart from the fourth sub-busbar 35 along the second direction B.

[0053] Therefore, by placing the third busbar 36 on the back of at least one battery string 20 included in at least one battery string group 10, the layout of the battery cells 23 within the photovoltaic module 100 is optimized, the number of battery cells 23 is increased, and the power of the photovoltaic module 100 is improved, so that the photovoltaic module 100 has a completely black effect when viewed from the front. At the same time, the third busbar 36 does not need to use black material, which can effectively reduce the production cost of the photovoltaic module 100.

[0054] According to some embodiments of this utility model, such as Figures 1-7 As shown, the photovoltaic module 100 also includes a junction box 50, which is located between two adjacent second busbars 33. The junction box 50 includes two diodes 51. The second busbars 33 and third busbars 36 adjacent to the two diodes 51 are electrically connected to the corresponding ends of the two diodes 51, respectively. The two diodes 51 are connected in reverse parallel to the adjacent battery string group 10.

[0055] Junction box 50 is disposed along the first direction A between the adjacent ends of the third sub-busbar 34 and the fourth sub-busbar 35. The ends of the third sub-busbar 34, the fourth sub-busbar 35 and the third busbar 36 adjacent to the two diodes 51 are electrically connected to the corresponding ends of the two diodes 51 respectively. The diodes 51 include a first diode 52 and a second diode 53. The first diode 52 is connected in reverse parallel with the first battery string 11, and the second diode 53 is connected in reverse parallel with the second battery string 12.

[0056] For example, when the first battery string group 11 and the second battery string group 12 are working normally, the current will not flow through the first diode 52 and the second diode 53. The current output from the output terminal of the external device flows through the fourth sub-busbar 35, and then through the three second battery strings 22 to the second sub-busbar 32, then to the first sub-busbar 31, and then through the three first battery strings 21 to the third sub-busbar 34, and finally output to the input terminal of the external device.

[0057] When a cell 23 in any of the first cell strings 21 in the first cell string group 11 is shaded or damaged, a hot spot effect occurs (i.e., some cells 23 in the photovoltaic module 100 have a short-circuit current less than the module's operating current due to shading, cracking, or other reasons, causing these cells 23 to be in a reverse bias state and consume energy generated in other areas). The first diode 52 can form a forward bias voltage, allowing the current to bypass the first cell string group 11, flow through the first diode 52 to the third sub-busbar 34, and be output to the input terminal of the external device.

[0058] Similarly, when the cell 23 of any second battery string 22 in the second battery string group 12 is blocked or malfunctions, and a hot spot effect occurs, the second diode 53 can form a forward bias voltage, so that the current bypasses the second battery string group 12, flows through the second diode 53 to the first sub-busbar 31, and then flows through the three first battery strings 21 to the third sub-busbar 34, and is output to the input terminal of the external device.

[0059] Therefore, by setting up a junction box 50, costs can be reduced, the photovoltaic module 100 can be connected to the external equipment circuit, and the current generated inside the photovoltaic module 100 can be output to the external equipment. At the same time, the two diodes 51 of the junction box 50 are connected in reverse parallel with the adjacent battery string group 10, which can prevent the battery string group 10 from being reverse charged, effectively protect the internal current of the battery string group 10, and improve the safety and reliability of the photovoltaic module 100.

[0060] According to some embodiments of this utility model, such as Figure 3 As shown, the junction box 50 includes: a first connection terminal 54, a second connection terminal 55, and a third connection terminal 56. The first connection terminal 54 and the second connection terminal 55 are spaced apart and are electrically connected to the adjacent second busbar 33, respectively. One of the two diodes 51 is located between the first connection terminal 54 and the third connection terminal 56, and the other of the two diodes 51 is located between the second connection terminal 55 and the third connection terminal 56. The other end of the third busbar 36 is connected to the third connection terminal 56. One of the two diodes 51 adjacent to the first connection terminal 54 is connected in reverse parallel with the adjacent battery string 10, and the other of the two diodes 51 adjacent to the second connection terminal 55 is connected in reverse parallel with the adjacent battery string 10.

[0061] The first connection terminal 54 and the second connection terminal 55 are spaced apart along the first direction A. The third connection terminal 56 is spaced apart from the first connection terminal 54 and the second connection terminal 55 along the second direction B. The first connection terminal 54 is electrically connected to the third sub-busbar 34, the second connection terminal 55 is electrically connected to the fourth sub-busbar 35, and the third connection terminal 56 is electrically connected to the third busbar 36. The first diode 52 is located between the first connection terminal 54 and the third connection terminal 56, and the second diode 53 is located between the second connection terminal 55 and the third connection terminal 56. When the first battery string group 11 and the second battery string group 12 are working normally, current does not flow through the third busbar 36, the first diode 52, and the second diode 53.

[0062] For example, when the cell 23 of any first battery string 21 in the first battery string group 11 is blocked or malfunctions, the first diode 52 is forward biased, and the current flows through the fourth sub-busbar 35 to the second sub-busbar 32, and through the third busbar 36 to the third connection terminal 56. After passing through the third connection terminal 56, the current flows to the first diode 52 and the first connection terminal 54, and then is output to the input terminal of the external device through the third sub-busbar 34. When the cell 23 of any second battery string 22 in the second battery string group 12 is blocked or malfunctions, the second diode 53 is forward biased, and the current flows through the fourth sub-busbar 35 to the second connection terminal 55, and through the second connection terminal 55 to the second diode 53 and the third connection terminal 56. After passing through the third busbar 36, the current flows sequentially to the first sub-busbar 31 and the third sub-busbar 34, and is output to the input terminal of the external device.

[0063] In this embodiment, the first connection end 54 can be a positive lead copper plate, and the second connection end 55 can be a negative lead copper plate.

[0064] Therefore, by setting the first connection terminal 54, the second connection terminal 55 and the third connection terminal 56, when a portion of the battery string 20 exhibits a hot spot effect, current can flow through the corresponding diode 51 and the connection terminal to shield the battery string 20 exhibiting the hot spot effect, prevent reverse charging of the battery string group 10, and improve the safety and reliability of the photovoltaic module 100.

[0065] According to some embodiments of this utility model, such as Figure 5 and Figure 7 As shown, the photovoltaic module 100 also includes: busbar lead-out line 60, and the second busbar 33 and the third busbar 36 are electrically connected to the adjacent junction box 50 through the busbar lead-out line 60.

[0066] Busbar lead-out line 60 is adapted to lead the current from the second busbar 33 and the third busbar 36 to the junction box 50. The busbar lead-out line 60 includes a first lead-out line 61, a second lead-out line 62 and a third lead-out line. One end of the first lead-out line 61 is electrically connected to the end of the third sub-busbar 34 near the junction box 50 along the first direction A, and the other end of the first lead-out line 61 is electrically connected to the first connection terminal 54. One end of the second lead-out line 62 is electrically connected to the end of the fourth sub-busbar 35 near the junction box 50 along the first direction A, and the other end of the second lead-out line 62 is electrically connected to the second connection terminal 55. One end of the third lead-out line is electrically connected to the end of the third busbar 36 near the junction box 50 along the second direction B, and the other end of the third lead-out line is electrically connected to the third connection terminal 56. Therefore, by setting the busbar lead-out line 60, the second busbar 33 and the third busbar 36 can be electrically connected to the junction box 50, avoiding the busbar offset caused by the direct connection of the second busbar 33 and the third busbar 36 to the junction box 50, ensuring the stability of the welding of the second busbar 33 and the third busbar 36, and improving the reliability and stability of the photovoltaic module 100.

[0067] According to some embodiments of this utility model, such as Figure 2 , Figure 5 and Figure 7 As shown, the shape of the projection of the junction box 50 onto the battery cell 23 is a triangle, trapezoid, or rectangle.

[0068] For example, the projection of the junction box 50 onto the battery cell 23 along the thickness direction of the battery cell 23 can be a triangular or trapezoidal shape, which facilitates the placement of the first connection terminal 54, the second connection terminal 55, the third connection terminal 56 and the two diodes 51 inside the junction box 50, while reducing the space occupied by the junction box 50.

[0069] Optionally, the projection of the junction box 50 onto the battery cell 23 along the thickness direction of the battery cell 23 is rectangular. This facilitates improved production efficiency of the junction box 50 and reduces processing difficulty.

[0070] According to some embodiments of this utility model, the battery cell 23 is a quarter-cell battery cell 23 cut from a whole battery cell, and the first direction A and the second direction B are different. In this embodiment, the first direction A is perpendicular to the second direction B.

[0071] Specifically, each battery string group 10 includes three battery strings 20 arranged in parallel along a first direction A. Each battery string 20 includes multiple battery cells 23 connected in series along a second direction B, and the battery cells 23 are one-quarter the size of a whole battery cell. Therefore, by adopting a four-in-three parallel design, the area of ​​each individual battery cell 23 forming the battery string 20 can be reduced, the current loop on the battery cell 23 can be shortened, the internal power loss of the battery cell 23 can be reduced, and the current of a single battery string 20 can be reduced, thereby increasing the output power of the photovoltaic module 100, making the photovoltaic module 100 more compatible with the current of the residential inverter, and improving the applicability and reliability of the photovoltaic module 100.

[0072] According to some embodiments of this utility model, such as Figure 2 and Figure 5 As shown, at least one of the first busbar 30 and the second busbar 33 is disposed on the back side of the battery string 10. The photovoltaic module 100 also includes a first insulating member 40, which is disposed between the first busbar 30 and the second busbar 33 and the battery cell 23. The battery string 20 includes a plurality of first solder ribbons 24 and a plurality of second solder ribbons 25. The currents collected by the first solder ribbons 24 and the second solder ribbons 25 have different polarities. The first insulating member 40 is disposed between the first busbar 30 and one of the first solder ribbons 24 and the second solder ribbon 25, and the first insulating member 40 is disposed between the second busbar 33 and the other of the first solder ribbons 24 and the second solder ribbon 25. In this embodiment, both the first busbar 30 and the second busbar 33 are disposed on the back side of the battery string 10 along the thickness direction of the battery cell 23. The first solder ribbons 24 collect positive current, and the second solder ribbons 25 collect negative current.

[0073] For example, the first insulating element 40 is disposed between the first sub-busbar 31 and the first solder strip 24 in the first battery string 11; the first insulating element 40 is disposed between the third sub-busbar 34 and the second solder strip 25 in the first battery string 11; the first insulating element 40 is disposed between the second sub-busbar 32 and the second solder strip 25 in the second battery string 12; and the first insulating element 40 is disposed between the fourth sub-busbar 35 and the first solder strip 24 in the second battery string 12. Thus, by disposing of the first insulating element 40 between the busbar and the solder strip of opposite polarity, the insulation between the busbar and the solder strip of opposite polarity can be improved, thereby enhancing the safety and reliability of the photovoltaic module 100.

[0074] According to some embodiments of this utility model, such as Figure 2 and Figure 5 As shown, the first insulating member 40 includes a plurality of insulating strips spaced apart along a first direction A. Therefore, by having the plurality of insulating strips respectively positioned along the first direction A between the busbar and the solder strip of opposite polarity, contact between the busbar and the solder strip of opposite polarity can be avoided, improving the safety and reliability of the photovoltaic module 100.

[0075] Optionally, the first insulating member 40 has a plurality of openings, the first busbar 30 is electrically connected at the opening to one of the first solder strip 24 and the second solder strip 25, and the second busbar 33 is electrically connected to the other of the first solder strip 24 and the second solder strip 25.

[0076] That is, the first insulating member 40 extends along the first direction A and is respectively disposed between the first busbar 30 and the battery cell 23 and between the second busbar 33 and the battery cell 23. Multiple openings penetrate the first insulating member 40 along the thickness direction of the battery cell 23, and multiple openings are respectively disposed between the first sub-busbar 31 and the second solder strip 25 in the first battery string 11, between the third sub-busbar 34 and the first solder strip 24 in the first battery string 11, between the second sub-busbar 32 and the first solder strip 24 in the second battery string 12, and between the fourth sub-busbar 35 and the second solder strip 25 in the second battery string 12.

[0077] Therefore, by forming multiple openings in the first insulating element 40, the busbar and the corresponding polarity solder strip are electrically connected through the openings, and the busbar and the opposite polarity solder strip are insulated at the unopened areas, resulting in better insulation, facilitating the installation of the first insulating element 40, and improving the safety and reliability of the photovoltaic module 100.

[0078] In this embodiment, the first insulating element 40 may be made of PET material with EVA material on one or both sides.

[0079] According to some embodiments of this utility model, such as Figure 7 As shown, when the first busbar 30 and the second busbar 33 are spaced apart from the ends of the battery string 10, the first insulating member 40 is not required between the first busbar 30 and the second busbar 33 and the battery cell 23. This ensures that the busbars do not contact solder strips of opposite polarity, thus reducing production costs.

[0080] According to some embodiments of the present invention, the width of the first busbar 30 and the second busbar 33 along the second direction B is L1, and L1 satisfies: 4mm≤L1≤12mm; the height of the first busbar 30 and the second busbar 33 along the thickness direction of the battery cell 23 is H1, and H1 satisfies: 0.1mm≤H1≤0.3mm.

[0081] When the widths of the first busbar 30 and the second busbar 33 along the second direction B are less than 4 mm, the smaller widths may lead to increased resistance and reduced current transmission efficiency of the first busbar 30 and the second busbar 33. Conversely, when the widths of the first busbar 30 and the second busbar 33 along the second direction B are greater than 12 mm, the larger widths may increase the cost of the busbars. For example, L1 = 8 mm.

[0082] When the height of the first busbar 30 and the second busbar 33 along the thickness direction of the solar cell 23 is less than 0.1 mm, the height of the first busbar 30 and the second busbar 33 along the thickness direction of the solar cell 23 is small, which may lead to a smaller cross-sectional area of ​​the first busbar 30 and the second busbar 33, an increase in resistance of the first busbar 30 and the second busbar 33, and a decrease in current transmission efficiency. When the height of the first busbar 30 and the second busbar 33 along the thickness direction of the solar cell 23 is greater than 0.3 mm, the height of the first busbar 30 and the second busbar 33 along the thickness direction of the solar cell 23 is large, which may increase the risk of lamination cracking of the solar cell 23. For example, H1 = 0.2 mm.

[0083] Therefore, by limiting the width range of the first busbar 30 and the second busbar 33 along the second direction B, and by limiting the height range of the first busbar 30 and the second busbar 33 along the thickness direction of the cell 23, the resistance of the first busbar 30 and the second busbar 33 can be reduced, the current transmission efficiency of the first busbar 30 and the second busbar 33 can be improved, the production cost can be reduced, the height of the photovoltaic module 100 can be reduced, the reliability of the photovoltaic module 100 can be improved, and it is beneficial to realize the thinner and lighter design of the photovoltaic module 100.

[0084] According to some embodiments of this utility model, such as Figure 1 , Figure 4 and Figure 6 As shown, the photovoltaic module 100 also includes a second insulating member 41, which is disposed between the third busbar 36 and the solar cell 23.

[0085] The second insulating member 41 extends along the second direction B and is disposed between the battery cells 23 in the third busbar 36 along the thickness direction of the battery cell 23. In this embodiment, the second insulating member 41 may be made of PET material with EVA material on one or both sides.

[0086] Therefore, by placing the second insulating member 41 between the third busbar 36 and the battery cell 23, the third busbar 36 can be prevented from contacting the battery cell 23 on the first battery string 21 and the second battery string 22, thus preventing short circuits inside the photovoltaic module 100. At the same time, the current on the third busbar 36 is prevented from flowing to the battery string group 10 where hot spot effects occur, thereby improving the safety and reliability of the photovoltaic module 100.

[0087] According to some embodiments of the present invention, the width of the third busbar 36 along the first direction A is L2, and L2 satisfies: 2mm≤L2≤8mm; the height of the third busbar 36 along the thickness direction of the battery cell 23 is H2, and H2 satisfies: 0.1mm≤H2≤0.3mm.

[0088] When the width of the third busbar 36 along the first direction A is less than 2mm, the width of the third busbar 36 along the first direction A is small, which may lead to an increase in the resistance of the third busbar 36 and a decrease in the current transmission efficiency of the third busbar 36. When the width of the third busbar 36 along the first direction A is greater than 8mm, the width of the third busbar 36 along the first direction A is large, which may lead to an increase in the cost of the busbar. For example, L2 = 5mm.

[0089] When the height of the third busbar 36 along the thickness direction of the solar cell 23 is less than 0.1 mm, the height of the third busbar 36 along the thickness direction of the solar cell 23 is small, which may lead to a smaller cross-sectional area of ​​the third busbar 36, an increase in the resistance of the third busbar 36, and a decrease in the current transmission efficiency of the third busbar 36. When the height of the third busbar 36 along the thickness direction of the solar cell 23 is greater than 0.3 mm, the height of the third busbar 36 along the thickness direction of the solar cell 23 is large, which may increase the risk of lamination cracking of the solar cell 23. For example, H2 = 0.2 mm.

[0090] Therefore, by limiting the width range of the third busbar 36 along the first direction A and the height range of the third busbar 36 along the thickness direction of the cell 23, the resistance of the third busbar 36 can be reduced, the current transmission efficiency of the third busbar 36 can be improved, the production cost can be reduced, the height of the photovoltaic module 100 can be reduced, the risk of lamination cracking of the cell 23 can be reduced, and the reliability of the photovoltaic module 100 can be improved.

[0091] According to some embodiments of the present invention, along the second direction B, two adjacent battery cells 23 overlap at least partially, and the width of the overlapping portion is L3, where L3 satisfies: 0 < L3 ≤ 1 mm.

[0092] When the width of the overlap between two adjacent battery cells 23 is greater than 1mm, the overlap area between the two adjacent battery cells 23 is large, resulting in excessive mutual shading between the battery cells 23 and affecting the output efficiency of the battery string 20. For example, L3 = 0.5mm.

[0093] Therefore, by limiting the width range of the overlapping portion between two adjacent solar cells 23, the structural strength and stability of the photovoltaic module 100 can be improved, the compactness of the arrangement of solar cells 23 within the photovoltaic module 100 can be increased, the utilization of the internal space of the photovoltaic module 100 can be increased, and the output power of the photovoltaic module 100 can be improved.

[0094] According to some embodiments of the present invention, each battery string 20 includes N battery cells 23, where N satisfies: 30≤N≤35.

[0095] When the number of solar cells 23 in each string 20 is less than 30, the number of solar cells 23 in each string 20 is too small, which may lead to a decrease in the proportion of the total area of ​​the solar cells 23 to the total area of ​​the photovoltaic module 100, a larger area of ​​each individual solar cell 23, a longer current loop inside the solar cell 23, and a decrease in the output power of the photovoltaic module 100. When the number of solar cells 23 in each string 20 is greater than 35, the number of solar cells 23 in each string 20 is too large, which increases the difficulty of the manufacturing process and the cost. For example, N=33.

[0096] Therefore, by limiting the range of the number of cells 23 included in each cell string 20, the area utilization rate of the photovoltaic module 100 is improved, the current loop inside the cell 23 is shortened, thereby reducing the internal power loss of the photovoltaic module 100 and improving the output power and reliability of the photovoltaic module 100.

[0097] According to some embodiments of the present invention, the spacing between each battery string 20 is L4, and L4 satisfies: 1mm≤L4≤2.5mm.

[0098] When the spacing between each cell string 20 is greater than 2.5mm, the spacing between each cell string 20 is too large, which may result in a lower area utilization rate of the photovoltaic module 100, a lower output power of the photovoltaic module 100, and an increase in the cost of the busbar. For example, L4=2mm.

[0099] Therefore, by limiting the spacing range between each battery string 20, the internal space of the photovoltaic module 100 can be utilized to the maximum extent, the cost of the busbar can be reduced, and the compactness of the battery string 20 arrangement within the photovoltaic module 100 can be improved, thereby enhancing the reliability of the photovoltaic module 100.

[0100] According to some embodiments of the present invention, the width of the second insulating member 41 along the first direction A is L5, and L5 satisfies: 10mm≤L5≤20mm; the height of the second insulating member 41 along the thickness direction of the battery cell 23 is H3, and H3 satisfies: 50um≤H3≤300um.

[0101] When the width of the second insulating member 41 along the first direction A is less than 10mm, the width of the second insulating member 41 along the first direction A is too small, which may cause insulation failure between the third busbar 36 and the solar cell 23, easily leading to a short circuit. When the width of the second insulating member 41 along the first direction A is greater than 20mm, the width of the second insulating member 41 along the first direction A is too large, which may reduce the output power of the photovoltaic module 100 and increase the production cost. For example, L5 = 15mm.

[0102] When the height of the second insulating component 41 along the thickness direction of the solar cell 23 is less than 50 μm, the height of the second insulating component 41 along the thickness direction of the solar cell 23 is too small, and it is easy to break down the second insulating component 41 when welding the third busbar 36, which can easily cause a short circuit. When the height of the second insulating component 41 along the thickness direction of the solar cell 23 is greater than 300 μm, the height of the second insulating component 41 along the thickness direction of the solar cell 23 is too large, which may increase the risk of lamination cracking of the solar cell 23. For example, H3 = 200 μm.

[0103] Therefore, by limiting the width range of the second insulating member 41 along the first direction A and the height range of the second insulating member 41 along the thickness direction of the cell 23, the third busbar 36 can be prevented from contacting the cell 23, thus avoiding short circuits, reducing the height of the photovoltaic module 100, reducing the risk of lamination cracking of the cell 23, and improving the safety and reliability of the photovoltaic module 100.

[0104] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0105] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0106] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0107] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that, include: Multiple battery string groups, wherein the multiple battery string groups are arranged in series only along a first direction, each battery string group includes three parallel battery strings, the three parallel battery strings are arranged in series only along the first direction and extend along a second direction, and each battery string includes multiple battery cells; Multiple first busbars extend along the first direction and are disposed at the first end of the battery string group along the second direction. The multiple first busbars are electrically connected to two adjacent battery string groups at the first end and are continuously disposed at the first end. Multiple second busbars extend along the first direction and are disposed at the second end of the battery string group along the second direction. The multiple second busbars are electrically connected to two adjacent battery string groups at the second end respectively. The multiple second busbars are intermittently arranged along the first direction. At least one third busbar extends along the second direction of the battery string assembly.

2. The photovoltaic module according to claim 1, characterized in that, At least one of the first busbar and the second busbar is disposed on the back of the battery string assembly; and / or, At least one of the first busbar and the second busbar is disposed at the end of the battery string along the second direction, and the at least one of the first busbar and the second busbar is spaced apart from the end of the battery string adjacent to it.

3. The photovoltaic module according to claim 1, characterized in that, The third busbar is disposed between two adjacent battery strings and extends along the second direction. One end of the third busbar is electrically connected to the first busbar, and the other end of the third busbar extends toward the second busbar.

4. The photovoltaic module according to claim 1, characterized in that, The third busbar is disposed on the back side of at least one of the battery strings included in at least one of the battery string groups and extends along the second direction. One end of the third busbar is electrically connected to the first busbar, and the other end of the third busbar extends toward the second busbar.

5. The photovoltaic module according to claim 1, characterized in that, Also includes: A junction box is disposed between two adjacent second busbars. The junction box includes two diodes. The second busbars adjacent to the two diodes and the third busbar are electrically connected to the corresponding ends of the two diodes, respectively. The two diodes are connected in reverse parallel to the adjacent battery string.

6. The photovoltaic module according to claim 5, characterized in that, The junction box includes: A first connection terminal and a second connection terminal are provided at an interval, and the first connection terminal and the second connection terminal are respectively electrically connected to the adjacent second busbar; The third connection terminal is provided with one of the two diodes located between the first connection terminal and the third connection terminal, and the other of the two diodes located between the second connection terminal and the third connection terminal. The other end of the third busbar is connected to the third connection terminal. One of the two diodes adjacent to the first connection terminal is connected in reverse parallel with the adjacent battery string, and the other of the two diodes adjacent to the second connection terminal is connected in reverse parallel with the adjacent battery string.

7. The photovoltaic module according to claim 5, characterized in that, Also includes: The busbar leads are provided, and the second busbar and the third busbar are electrically connected to the adjacent junction box via the busbar leads.

8. The photovoltaic module according to claim 5, characterized in that, The shape of the projection of the junction box onto the battery cell is triangular, trapezoidal, or rectangular.

9. The photovoltaic module according to claim 1, characterized in that, The battery cell is a quarter-cell battery cell cut from a whole battery cell, and the first direction and the second direction are different.

10. The photovoltaic module according to claim 1, characterized in that, At least one of the first busbar and the second busbar is disposed on the back of the battery string, and the photovoltaic module further includes: A first insulating element is disposed between the first busbar and the second busbar and the battery cell; The battery string includes multiple first solder strips and multiple second solder strips, the currents collected by the first solder strips and the second solder strips having different polarities, the first insulating element being disposed between the first busbar and one of the first solder strips and the second solder strip, and the first insulating element being disposed between the second busbar and the other of the first solder strips and the second solder strip.

11. The photovoltaic module according to claim 10, characterized in that, The first insulating element includes a plurality of insulating strips spaced apart along the first direction; and / or, The first insulating element has a plurality of openings, the first busbar is electrically connected at the opening to one of the first solder strip and the second solder strip, and the second busbar is electrically connected to the other of the first solder strip and the second solder strip.

12. The photovoltaic module according to claim 1, characterized in that, The width of the first busbar and the second busbar along the second direction is L1, and L1 satisfies: 4mm≤L1≤12mm; The height of the first busbar and the second busbar along the thickness direction of the battery cell is H1, and H1 satisfies: 0.1mm≤H1≤0.3mm.

13. The photovoltaic module according to claim 1, characterized in that, Also includes: The second insulating element is disposed between the third busbar and the battery cell.

14. The photovoltaic module according to claim 1, characterized in that, The width of the third busbar along the first direction is L2, and L2 satisfies: 2mm≤L2≤8mm; The height of the third busbar along the thickness direction of the battery cell is H2, and H2 satisfies: 0.1mm≤H2≤0.3mm.

15. The photovoltaic module according to claim 1, characterized in that, Along the second direction, two adjacent battery cells overlap at least partially, and the width of the overlap is L3, wherein L3 satisfies: 0 < L3 ≤ 1 mm.

16. The photovoltaic module according to any one of claims 1-15, characterized in that, Each battery string includes N battery cells, where N satisfies: 30 ≤ N ≤ 35.

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