Battery string assembly, photovoltaic assembly and photovoltaic power generation system

Abstract

The utility model discloses a battery string assembly, a photovoltaic assembly and a photovoltaic power generation system. The battery string assembly comprises at least one battery string and at least one bus bar. The battery string comprises a plurality of battery pieces, and the plurality of battery pieces of the battery string extend along a first direction; the bus bar comprises a middle bus bar, the middle bus bar extends along a second direction, the first direction is perpendicular to the second direction, the middle bus bar is arranged on the back surfaces of two adjacent battery pieces of the same battery string, and the middle bus bar is in lap joint with the back surfaces of the two battery pieces. The middle bus bars are arranged on the back surfaces of the battery pieces, and the middle bus bars are in lap joint with the adjacent ends of the two adjacent battery pieces, so that the arrangement density of the battery pieces in the same battery string can be improved, the middle bus bars are prevented from occupying the light receiving surfaces of the battery pieces, the layout design of the battery pieces in the battery string is optimized, the density of the battery pieces is maximized, and the reliability of the battery string is improved. The output power and efficiency of the photovoltaic module are improved, and the bus bar is black, so that the battery string is beautiful.

Description

Technical Field

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

[0002] In existing technologies, back-contact photovoltaic modules consist of several cell strings connected in series by solder strips, and the current is collected and output through a busbar located between two adjacent cells. The busbar occupies part of the light-receiving surface of the photovoltaic module, reducing the density of cells in the photovoltaic module, and at the same time, reducing the output power and efficiency of the photovoltaic module. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery string assembly that can improve the output power and efficiency of photovoltaic modules.

[0004] The second objective of this invention is to provide a photovoltaic module, including the battery string module described in any one of the embodiments of the first aspect above.

[0005] The third objective of this invention is to provide a photovoltaic power generation system, comprising the battery string assembly described in any one of the first aspect embodiments above, or the photovoltaic module described in the second aspect embodiments above.

[0006] According to a first aspect embodiment of the present invention, the battery string assembly includes: at least one battery string and at least one busbar. The battery string includes a plurality of battery cells, which extend along a first direction. The busbar includes an intermediate busbar that extends along a second direction, wherein the first direction and the second direction are perpendicular. The intermediate busbar is disposed on the back side of two adjacent battery cells in the same battery string, and the intermediate busbar overlaps with the back side of both battery cells.

[0007] According to the battery string assembly of this utility model embodiment, by placing the intermediate busbar on the back of the battery cell and overlapping the adjacent ends of the intermediate busbar with the two adjacent battery cells, the arrangement density of the battery cells in the same battery string can be increased, the intermediate busbar is avoided from occupying the light-receiving surface of the battery cell, the layout design of the battery cells in the battery string is optimized, thereby maximizing the battery cell density and improving the output power and efficiency of the photovoltaic module. At the same time, using black for the busbar can make the battery string more aesthetically pleasing.

[0008] In some embodiments, the back of the battery cell is provided with a plurality of first grid lines and a plurality of second grid lines, which are alternately arranged along the first direction, and the polarities of the first grid lines and the second grid lines are opposite. The battery string further includes: a plurality of first solder strips and a plurality of second solder strips, wherein the plurality of first solder strips are electrically connected to the plurality of first grid lines and are insulated from the plurality of second grid lines; the plurality of second solder strips are electrically connected to the plurality of second grid lines and are insulated from the plurality of first grid lines; two adjacent battery cells in the same battery string are electrically connected through the first solder strips and the second solder strips; one of the first solder strips and the second solder strips is electrically connected to the intermediate busbar, and the other of the first solder strips and the second solder strips is insulated from the intermediate busbar.

[0009] In some embodiments, the other of the first and second solder strips is spaced apart from the intermediate busbar.

[0010] In some embodiments, the busbar further includes: at least one edge busbar disposed on the back side of the end of the battery string along the first direction, one of the first solder strip and the second solder strip being connected to the edge busbar, and the other of the first solder strip and the second solder strip being spaced apart from the edge busbar.

[0011] In some embodiments, the edge busbar extends along the second direction and connects multiple first solder strips or multiple second solder strips of the same polarity between two adjacent battery strings.

[0012] In some embodiments, there are multiple edge busbars, which are respectively disposed at both ends of the battery string along the first direction, and the intermediate busbar is disposed between two adjacent edge busbars along the first direction.

[0013] In some embodiments, the plurality of battery strings include at least: a first battery string unit and a second battery string unit, wherein the first battery string unit includes two battery strings spaced apart along a second direction; the second battery string unit includes two battery strings spaced apart along a second direction, the edge busbar connects two adjacent battery strings at the ends of the battery strings along the first direction, and the intermediate busbar connects adjacent first battery string units and second battery string units.

[0014] In some embodiments, there are multiple intermediate busbars, including: a first busbar disposed between adjacent cells of the same battery string; and / or a second busbar disposed between adjacent first battery string units and second battery string units, one end of the second busbar being between two adjacent cells of the battery string adjacent to the first battery string unit and the second battery string unit, and the other end of the second busbar being between two adjacent cells of the battery string adjacent to the first battery string unit.

[0015] In some embodiments, the battery string assembly further includes a separator disposed between the first solder strip and / or the second solder strip and the battery cell, and the separator is opposite to the gap between two adjacent battery cells in the same battery string.

[0016] In some embodiments, the separator and the intermediate busbar are opposite each other along the thickness direction of the battery cell, and the intermediate busbar is located on the side of the first solder strip and / or the second solder strip away from the separator.

[0017] In some embodiments, the back surface of the battery cell has a first region and a second region, a plurality of first grid lines and a plurality of second grid lines are disposed in the first region, and the second region is disposed adjacent to the edge of the battery cell.

[0018] In some embodiments, the second region forms a grid-free region.

[0019] In some embodiments, the second region is formed with a gate line region, the gate lines in the second region have the same polarity, and the gate lines in the second region are aligned with the gate lines of the same polarity in the first region along a first direction.

[0020] In some embodiments, the second region is partially formed into a region without gate lines, the second region is partially formed into a region with gate lines, and the gate lines of the second region have the same polarity.

[0021] The photovoltaic module according to the second aspect of the present invention includes the battery string module described in any one of the first aspect embodiments.

[0022] The photovoltaic power generation system according to the third aspect of the present invention includes the battery string assembly described in any one of the first aspect embodiments, or the photovoltaic module described in the second aspect embodiments.

[0023] 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

[0024] 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:

[0025] Figure 1 This is a schematic diagram of a battery string assembly according to an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of a view of the intermediate busbar in an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of the first and second regions according to an embodiment of the present utility model.

[0028] Figure label:

[0029] 100. Battery string assembly;

[0030] 10. Battery string; 11. Battery cell; 12. First grid line; 13. Second grid line; 14. First solder ribbon; 15. Second solder ribbon; 16. First battery string unit; 17. Second battery string unit;

[0031] 20. Busbar; 21. Intermediate busbar; 211. First busbar; 212. Second busbar; 22. Edge busbar;

[0032] 30. Divider;

[0033] 40. First area; 41. Second area;

[0034] A. First direction; B. Second direction. Detailed Implementation

[0035] 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 battery string assembly 100 according to an embodiment of the present invention includes at least one battery string 10 and at least one busbar 20.

[0036] Specifically, such as Figure 1 As shown, the battery string 10 includes a plurality of battery cells 11, which extend along a first direction A; the busbar 20 includes a middle busbar 21, which extends along a second direction B, with the first direction A and the second direction B being perpendicular. The middle busbar 21 is located on the back of two adjacent battery cells 11 in the same battery string 10, and the middle busbar 21 overlaps with the back of both battery cells 11.

[0037] That is, multiple battery cells 11 are aligned and electrically connected along the first direction A, and the battery string 10 is composed of multiple battery cells 11 connected in series. The intermediate busbar 21 extends along the second direction B, and the busbar 20 is located on the back side of two adjacent battery cells 11 along the thickness direction of the battery cells 11. The intermediate busbar 21 is electrically connected to the adjacent ends of the two adjacent battery cells 11. The projections of the intermediate busbar 21 and the two adjacent battery cells 11 electrically connected to the battery string 10 along the thickness direction of the battery cells 11 partially overlap on the horizontal projection plane.

[0038] In this embodiment, the color of the busbar 20 can be designed to be close to the color of the battery cell 11, such as black.

[0039] According to the embodiment of the present invention, the battery string assembly 100, by placing the intermediate busbar 21 on the back of the battery cell 11, and having the intermediate busbar 21 overlap with the adjacent ends of two adjacent battery cells 11, increases the contact between the intermediate busbar 21 and the two adjacent battery cells 11, thereby improving the reliability of the electrical connection between the intermediate busbar 21 and the two adjacent battery cells 11. Simultaneously, placing the intermediate busbar 21 on the back of the battery cell 11 increases the arrangement density of the battery cells 11 in the same battery string 10, avoiding the intermediate busbar 21 being placed between two battery cells 11 and on the same plane as the battery cell 11, thus occupying the light-receiving surface of the battery cell 11. This optimizes the layout design of the battery cells 11 in the battery string 10, thereby maximizing the density of the battery cells 11, improving the output power and efficiency of the photovoltaic module, and keeping the front of the battery string 10 clean.

[0040] According to some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the back of the battery cell 11 is provided with a plurality of first grid lines 12 and a plurality of second grid lines 13, which are alternately arranged along a first direction A. The polarities of the first grid lines 12 and the second grid lines 13 are opposite. The battery string 10 also includes a plurality of first solder ribbons 14 and a plurality of second solder ribbons 15. The plurality of first solder ribbons 14 are electrically connected to the plurality of first grid lines 12 and are insulated from the plurality of second grid lines 13. The plurality of second solder ribbons 15 are electrically connected to the plurality of second grid lines 13 and are insulated from the plurality of first grid lines 12. Two adjacent battery cells 11 in the same battery string 10 are electrically connected through the first solder ribbons 14 and the second solder ribbons 15. One of the first solder ribbons 14 and the second solder ribbons 15 is electrically connected to the intermediate busbar 21, and the other of the first solder ribbons 14 and the second solder ribbons 15 is insulated from the intermediate busbar 21.

[0041] Taking the first grid line 12 as the positive grid line and the second grid line 13 as the negative grid line as an example, the first grid line 12 and the second grid line 13 are alternately spaced along the first direction A. Multiple first solder strips 14 and multiple second solder strips 15 extend along the first direction A, and are alternately spaced along the second direction B. Multiple battery cells 11 of the same battery string 10 are connected in series through multiple first solder strips 14 and multiple second solder strips 15. In this embodiment, the intermediate busbar 21 is electrically connected to the adjacent ends of two adjacent first solder strips 14, and the intermediate busbar 21 and the second solder strips 15 are insulated from each other.

[0042] Thus, two adjacent battery cells 11 in the same battery string 10 are electrically connected by a first solder strip 14 and a second solder strip 15. One of the first solder strip 14 and the second solder strip 15 is electrically connected to the intermediate bus bar 21, and the other of the first solder strip 14 and the second solder strip 15 is insulated from the intermediate bus bar 21. This allows the current on the multiple first grid lines 12 to be led out through the multiple first solder strips 14 and collected to the intermediate bus bar 21. At the same time, it can prevent the second grid line 13 from forming an electrical connection with the intermediate bus bar 21, thus avoiding short circuits and improving the safety and reliability of the battery string 10.

[0043] According to some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the other of the first solder strip 14 and the second solder strip 15 is spaced apart from the intermediate busbar 21.

[0044] In this embodiment, the second solder strip 15 can be spaced apart from the intermediate busbar 21, that is, the adjacent ends of two adjacent second solder strips 15 are spaced apart from the intermediate busbar 21 along the first direction A. Thus, the other of the first solder strip 14 and the second solder strip 15 is spaced apart from the intermediate busbar 21, avoiding overlap between the intermediate busbar 21 and the second solder strip 15, preventing short circuits, improving the safety of the photovoltaic module, and eliminating the need for insulating adhesive for insulation. This reduces the complexity of the photovoltaic module manufacturing process and saves production costs.

[0045] According to some embodiments of this utility model, such as Figure 1 As shown, the busbar 20 further includes: at least one edge busbar 22, the edge busbar 22 being disposed on the back side of the end of the battery string 10 along a first direction A, one of the first solder strip 14 and the second solder strip 15 being connected to the edge busbar 22, and the other of the first solder strip 14 and the second solder strip 15 being spaced apart from the edge busbar 22.

[0046] That is, the edge busbar 22 extends along the second direction B, and the edge busbar 22 is disposed at the end of the battery string 10 along the first direction A. At the same time, the edge busbar 22 and the middle busbar 21 are disposed on the same side of the battery cell 11 along the thickness direction of the battery cell 11, i.e., the back side. In this embodiment, the length of the second solder strip 15 along the first direction A is greater than that of the first solder strip 14. The end of the second solder strip 15 adjacent to the end of the battery cell 11 along the first direction A forms an electrical connection with the edge busbar 22, and the first solder strip 14 is spaced apart from the edge busbar 22.

[0047] Therefore, one of the first solder strip 14 and the second solder strip 15 is connected to the edge bus bar 22, and the other of the first solder strip 14 and the second solder strip 15 is spaced apart from the edge bus bar 22. This facilitates the current on the multiple second grid lines 13 to be led out through the multiple second solder strips 15 and collected on the edge bus bar 22. It can avoid the formation of an electrical connection between the first solder strip 14 and the edge bus bar 22, avoid short circuits, and effectively improve the safety and reliability of the battery string 10. Since the edge bus bar 22 is located on the back side of the end of the battery string 10, it can avoid occupying the light-receiving surface of the photovoltaic module and improve the output power of the photovoltaic module.

[0048] According to some embodiments of this utility model, such as Figure 1 As shown, the edge busbar 22 extends along the second direction B, and the edge busbar 22 connects two adjacent battery strings 10 with multiple first solder strips 14 or multiple second solder strips 15 of the same polarity.

[0049] In this embodiment, two adjacent battery strings 10 are spaced apart along the second direction B, and the edge busbar 22 extends along the second direction B and forms an electrical connection with one end of a plurality of second solder strips 15 in the two adjacent battery strings 10 near the end of the cell 11. Thus, the edge busbar 22 connects multiple first solder strips 14 or multiple second solder strips 15 of the same polarity in the two adjacent battery strings 10, facilitating the collection and transmission of current on multiple second grid lines 13 in the two adjacent battery strings 10 through the multiple second solder strips 15 to the edge busbar 22. This reduces uneven current distribution in the battery strings 10 and improves the efficiency and reliability of the photovoltaic module.

[0050] According to some embodiments of this utility model, such as Figure 1 As shown, there are multiple edge busbars 22, which are respectively disposed at both ends of the battery string 10 along the first direction A, and the middle busbar 21 is disposed between two adjacent edge busbars 22 along the first direction A.

[0051] That is, multiple edge busbars 22 extend along the second direction B and are respectively disposed on the back of both ends of the battery string 10 along the first direction A. At the same time, multiple edge busbars 22 are electrically connected to both ends of the second solder strip 15 along the first direction A. The middle busbar 21 extends along the first direction A and is disposed at intervals between two adjacent edge busbars 22 along the first direction A. At the same time, the middle busbar 21 is electrically connected to the adjacent ends of two adjacent first solder strips 14.

[0052] Therefore, multiple edge busbars 22 are respectively disposed at both ends of the battery string 10 along the first direction A, and the middle busbar 21 is disposed between two adjacent edge busbars 22 along the first direction A. This can reasonably divide the current on the first grid line 12 and the second grid line 13 on the two adjacent battery strings 10, thereby improving the output power and working efficiency of the photovoltaic module. Furthermore, the edge busbars 22 are spaced apart from the first solder strip 14, and the middle busbar 21 is spaced apart from the second solder strip 15, which can avoid short circuits, improve the safety and reliability of the battery string 10, and extend the service life of the battery string 10.

[0053] According to some embodiments of this utility model, such as Figure 1 As shown, the plurality of battery strings 10 include at least: a first battery string unit 16 and a second battery string unit 17. The first battery string unit 16 includes two battery strings 10 spaced apart along the second direction B; the second battery string unit 17 includes two battery strings 10 spaced apart along the second direction B. An edge busbar 22 connects two adjacent battery strings 10 at the ends of the battery strings 10 along the first direction A, and a middle busbar 21 connects the adjacent first battery string unit 16 and second battery string unit 17.

[0054] That is, two adjacent battery strings 10 extend along the first direction A and are spaced apart along the second direction B, forming a first battery string unit 16. A second battery string unit 17 is spaced apart from the first battery string unit 16 along the second direction B. Edge busbars 22 are respectively disposed at both ends of the first battery string unit 16 and the second battery string unit 17 along the first direction A, and the edge busbars 22 respectively connect two adjacent battery strings 10 in the first battery string unit 16 and the second battery string unit 17. The middle busbar 21 extends along the second direction B and is respectively connected to two adjacent battery strings 10 in the first battery string unit 16 and the second battery string unit 17.

[0055] Thus, the edge busbar 22 connects two adjacent battery strings 10 at the end of the battery string 10 along the first direction A, and the middle busbar 21 connects the adjacent first battery string unit 16 and second battery string unit 17. This facilitates the edge busbar 22 to collect the current of multiple second grid lines 13 in the first battery string unit 16 and the second battery string unit 17, and the middle busbar 21 to collect the current of multiple first grid lines 12 in two adjacent battery strings 10 in the first battery string unit 16 and the second battery string unit 17, thereby improving the working efficiency of the first battery string unit 16 and the second battery string unit 17.

[0056] According to some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, there are multiple intermediate busbars 21, including: a first busbar 211, which is disposed between adjacent battery cells 11 in the same battery string 10; or, the multiple intermediate busbars 21 include a second busbar 212, which is disposed between adjacent first battery string units 16 and second battery string units 17, with one end of the second busbar 212 between two adjacent battery cells 11 of the battery string 10 of the first battery string unit 16 adjacent to the second battery string unit 17, and the other end of the second busbar 212 between two adjacent battery cells 11 of the battery string 10 of the second battery string unit 17 adjacent to the first battery string unit 16.

[0057] Optionally, the plurality of intermediate busbars 21 include a first busbar 211 and a second busbar 212. The first busbar 211 is disposed between adjacent battery cells 11 of the same battery string 10, and the second busbar 212 is disposed between adjacent first battery string units 16 and second battery string units 17. One end of the second busbar 212 is between two adjacent battery cells 11 of the battery string 10 of the first battery string unit 16 adjacent to the second battery string unit 17, and the other end of the second busbar 212 is between two adjacent battery cells 11 of the battery string 10 of the second battery string unit 17 adjacent to the first battery string unit 16.

[0058] For example, the plurality of intermediate busbars 21 include a first busbar 211, which is disposed on the back side of the battery cell 11 along the thickness direction of the battery cell 11, and the first busbar 211 is electrically connected to the first solder strip 14 on the adjacent ends of two adjacent battery cells 11.

[0059] Optionally, the plurality of intermediate busbars 21 may further include a second busbar 212. The second busbar 212 is disposed on the back side of the battery cell 11 along the thickness direction of the battery cell 11. One end of the second busbar 212 is electrically connected to the first solder strip 14 on the adjacent ends of two adjacent battery cells 11 in the battery string 10 of the first battery string unit 16 adjacent to the second battery string unit 17. The other end of the second busbar 212 is electrically connected to the first solder strip 14 on the adjacent ends of two adjacent battery cells 11 in the battery string 10 of the first battery string unit 16 adjacent to the second battery string unit 17.

[0060] In this embodiment, the plurality of intermediate busbars 21 include a first busbar 211 and a second busbar 212.

[0061] Therefore, the multiple intermediate busbars 21 include: a first busbar 211, which is disposed between adjacent battery cells 11 in the same battery string 10; and / or, a second busbar 212, which is disposed between adjacent first battery string units 16 and second battery string units 17. One end of the second busbar 212 is between two adjacent battery cells 11 of the battery string 10 of the first battery string unit 16 adjacent to the second battery string unit 17, and the other end of the second busbar 212 is between two adjacent battery cells 11 of the battery string 10 of the second battery string unit 17 adjacent to the first battery string unit 16. This facilitates the collection of current from the first grid line 12 in the multiple battery strings 10 by the multiple intermediate busbars 21, improves the working efficiency of the intermediate busbars 21, and at the same time improves the working efficiency of the multiple battery strings 10, avoiding energy loss.

[0062] According to some embodiments of this utility model, such as Figure 2 As shown, the battery string assembly 100 further includes a separator 30, which is disposed between the first solder strip 14 and / or the second solder strip 15 and the battery cell 11, and the separator 30 is opposite to the gap between two adjacent battery cells 11 in the same battery string 10.

[0063] In this embodiment, the separator 30 is disposed between the battery cell 11 and the first solder strip 14 along the thickness direction of the battery cell 11. The first solder strip 14 and the separator 30 form an electrical connection. The current of the first grid line 12 is transmitted to the first solder strip 14 through the separator 30 and converges to the intermediate busbar 21. The separator 30 is designed to be close to the color of the battery cell 11. The separator 30 is suitable for blocking the gap between two adjacent battery cells 11.

[0064] Therefore, the separator 30 is disposed between the first welding strip 14 and / or the second welding strip 15 and the battery cell 11, and the separator 30 is opposite to the gap between two adjacent battery cells 11 in the same battery string 10. It can block the gap between two adjacent battery cells 11, prevent dust and other impurities from entering the back of the battery cell 11 through the gap, improve the sealing and reliability of the battery string 10, and optimize the layout of the battery string 10, thereby making the battery string 10 more aesthetically pleasing.

[0065] According to some embodiments of this utility model, such as Figure 2 As shown, the separator 30 and the intermediate busbar 21 are opposite each other along the thickness direction of the battery cell 11, and the intermediate busbar 21 is located on the side of the first solder strip 14 and / or the second solder strip 15 away from the separator 30.

[0066] In this embodiment, the separator 30 is opposite to the intermediate busbar 21 along the thickness direction of the battery cell 11, and the intermediate busbar 21 is located on the side of the first solder strip 14 away from the separator 30 along the thickness direction of the battery cell 11. Thus, the separator 30 and the intermediate busbar 21 are opposite to each other along the thickness direction of the battery cell 11, and the intermediate busbar 21 is located on the side of the first solder strip 14 and / or the second solder strip 15 away from the separator 30. The separator 30 can effectively block the intermediate busbar 21, making the battery string 10 more aesthetically pleasing and helping the battery string assembly 100 to be formed as an all-black assembly.

[0067] According to some embodiments of this utility model, such as Figure 3 As shown, the back of the battery cell 11 has a first region 40 and a second region 41. A plurality of first grid lines 12 and a plurality of second grid lines 13 are disposed in the first region 40, and the second region 41 is disposed adjacent to the edge of the battery cell 11.

[0068] That is, the battery cell 11 electrically connected to the edge busbar 22 and the two adjacent battery cells 11 electrically connected to the middle busbar 21 have a first region 40 and a second region 41, wherein the first region 40 includes a plurality of first grid lines 12 and a plurality of second grid lines 13, and the second region 41 is disposed adjacent to the edge busbar 22 and the middle busbar 21.

[0069] Therefore, multiple first grid lines 12 and multiple second grid lines 13 are all located in the first region 40, and the second region 41 is located near the edge of the battery cell 11. This facilitates the optimization of the grid line design in the second region 41, better avoids the edge busbar 22 from contacting the first solder strip 14, and avoids the middle busbar 21 from contacting the second solder strip 15, thereby improving the safety and reliability of the battery string 10.

[0070] According to some embodiments of the present invention, the second region 41 forms a grid-free region.

[0071] For example, the second region 41 adjacent to the edge busbar 22 and the middle busbar 21 forms a grid-free region, meaning that the first solder strip 14 and the second solder strip 15 are not provided in the second region 41. Thus, the second region 41 forms a grid-free region, which avoids contact between the edge busbar 22 and the first solder strip 14, and simultaneously avoids contact between the middle busbar 21 and the second solder strip 15, preventing short circuits in the battery string 10, effectively improving the safety and reliability of the battery string 10, and extending the service life of the battery string 10.

[0072] According to some embodiments of the present invention, a second region 41 is formed with a grid line region, the grid lines of the second region 41 have the same polarity, and the grid lines of the second region 41 are aligned with the grid lines of the same polarity of the first region 40 along the first direction A.

[0073] Optionally, a second grid line 13 of the same polarity is provided in the second region 41 adjacent to the edge bus bar 22, that is, only the second solder strip 15 is retained in the second region 41 adjacent to the edge bus bar 22; a first grid line 12 of the same polarity is provided in the second region 41 adjacent to the middle bus bar 21, that is, only the first solder strip 14 is retained in the second region 41 adjacent to the middle bus bar 21.

[0074] Therefore, the grid lines of the second region 41 have the same polarity, and the grid lines of the second region 41 are aligned with the grid lines of the same polarity of the first region 40 along the first direction A. This can prevent the edge busbar 22 from contacting the first solder strip 14, and at the same time, prevent the middle busbar 21 from contacting the second solder strip 15, thus preventing the battery string 10 from short-circuiting. This effectively improves the safety and reliability of the battery string 10 and extends the service life of the battery string 10.

[0075] According to some embodiments of this utility model, such as Figure 3 As shown, the second region 41 partially forms a region without grid lines, and the second region 41 partially forms a region with grid lines, and the grid lines of the second region 41 have the same polarity.

[0076] Optionally, a second grid line 13 of the same polarity is partially provided in the second region 41 adjacent to the edge busbar 22, forming a grid-free region in part; a first grid line 12 of the same polarity is partially provided in the second region 41 adjacent to the middle busbar 21, forming a grid-free region in part.

[0077] Thus, the second region 41 partially forms a grid-free region and a grid-lined region, and the grid lines in the second region 41 have the same polarity. This can prevent the edge busbar 22 from contacting the first solder strip 14, and at the same time, prevent the middle busbar 21 from contacting the second solder strip 15, thus preventing short circuits in the battery string 10. This effectively improves the safety and reliability of the battery string 10 and extends its service life.

[0078] A photovoltaic module according to a second aspect of the present invention includes a battery string assembly 100 as described in any of the first aspect embodiments above.

[0079] In this embodiment, by placing the edge busbar 22 and the middle busbar 21 on the back of the solar cell 11, the shading of the solar cell 11 by the busbar 20 can be effectively avoided, while increasing the light density of the solar cell 11, thereby improving the working efficiency and output power of the photovoltaic module. At the same time, placing the separator 30 along the thickness direction of the solar cell 11 between the solar cell 11 and the first solder strip 14 can improve the appearance of the photovoltaic module. The second region 41 partially forms a grid-free region and partially forms a grid-lined region of the same polarity, which can prevent the busbar 20 from collecting currents of different polarities and causing short circuits, effectively improving the safety and reliability of the photovoltaic module.

[0080] The photovoltaic power generation system according to the third aspect of the present invention includes the battery string assembly 100 of any one of the first aspect embodiments, or the photovoltaic module of the second aspect embodiment.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 battery string assembly, characterized in that, include: At least one battery string, the battery string comprising a plurality of battery cells, the plurality of battery cells of the battery string extending along a first direction; At least one busbar, the busbar including an intermediate busbar extending along a second direction, the first direction and the second direction being perpendicular, the intermediate busbar being disposed on the back of two adjacent battery cells in the same battery string, and the intermediate busbar overlapping the back of both battery cells.

2. The battery string assembly according to claim 1, characterized in that, The back of the battery cell is provided with a plurality of first grid lines and a plurality of second grid lines, which are alternately arranged along the first direction, and the polarities of the first grid lines and the second grid lines are opposite. The battery string also includes: Multiple first solder strips are electrically connected to multiple first gate lines, and multiple first solder strips are insulated from multiple second gate lines; Multiple second solder strips are electrically connected to multiple second grid lines and insulated from multiple first grid lines. Two adjacent cells in the same cell string are electrically connected through the first solder strip and the second solder strip. One of the first solder strip and the second solder strip is electrically connected to the intermediate busbar, and the other of the first solder strip and the second solder strip is insulated from the intermediate busbar.

3. The battery string assembly according to claim 2, characterized in that, The other of the first and second solder strips is spaced apart from the intermediate busbar.

4. The battery string assembly according to claim 2, characterized in that, The busbar also includes: At least one edge busbar is disposed on the back side of the end of the battery string along the first direction, one of the first solder strip and the second solder strip is connected to the edge busbar, and the other of the first solder strip and the second solder strip is spaced apart from the edge busbar.

5. The battery string assembly according to claim 4, characterized in that, The edge busbar extends along the second direction and connects multiple first solder strips or multiple second solder strips of the same polarity between two adjacent battery strings.

6. The battery string assembly according to claim 4, characterized in that, There are multiple edge busbars, which are respectively disposed at both ends of the battery string along the first direction, and the middle busbar is disposed between two adjacent edge busbars along the first direction.

7. The battery string assembly according to claim 4, characterized in that, The plurality of said battery strings include at least: A first battery string unit, the first battery string unit comprising two battery strings spaced apart along a second direction; The second battery string unit includes two battery strings spaced apart along a second direction. The edge busbar connects two adjacent battery strings at their ends along the first direction, and the middle busbar connects adjacent first battery string units and second battery string units.

8. The battery string assembly according to claim 7, characterized in that, There are multiple intermediate busbars, and the multiple intermediate busbars include: A first busbar is disposed between adjacent cells of the same battery string; and / or, The second busbar is disposed between adjacent first battery string units and second battery string units. One end of the second busbar is between two adjacent battery cells of the battery string adjacent to the first battery string unit and the second battery string unit. The other end of the second busbar is between two adjacent battery cells of the battery string adjacent to the first battery string unit.

9. The battery string assembly according to claim 2, characterized in that, Also includes: A separator is disposed between the first solder strip and / or the second solder strip and the battery cell, and the separator is opposite to the gap between two adjacent battery cells in the same battery string.

10. The battery string assembly according to claim 9, characterized in that, The separator and the intermediate busbar are opposite each other along the thickness direction of the battery cell, and the intermediate busbar is located on the side of the first solder strip and / or the second solder strip away from the separator.

11. The battery string assembly according to any one of claims 2-10, characterized in that, The back of the battery cell has a first region and a second region, with a plurality of first grid lines and a plurality of second grid lines disposed in the first region, and the second region disposed adjacent to the edge of the battery cell.

12. The battery string assembly according to claim 11, characterized in that, The second region forms a grid-free region.

13. The battery string assembly according to claim 11, characterized in that, The second region has a grid line region, the grid lines in the second region have the same polarity, and the grid lines in the second region are aligned with the grid lines of the same polarity in the first region along a first direction.

14. The battery string assembly according to claim 11, characterized in that, The second region partially forms a grid-free region, and the second region partially forms a grid-lined region, with the grid lines in the second region having the same polarity.

15. A photovoltaic module, characterized in that, Includes the battery string assembly according to any one of claims 1-14.

16. A photovoltaic power generation system, characterized in that, Includes a battery string assembly according to any one of claims 1-14, or a photovoltaic module according to claim 15.

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