Photovoltaic module

Abstract

The invention relates to a photovoltaic module. The photovoltaic module comprises a first battery string group; the first battery string group comprises a plurality of first battery strings which are connected in parallel, and battery pieces of each first battery string are arranged along a first direction; the second battery string group and the third battery string group are oppositely arranged along the first direction; each of the second battery string group and the third battery string group comprises two battery string subgroups which are oppositely arranged and connected in parallel, each battery string subgroup is connected with the first battery string group in series, each battery string subgroup comprises a plurality of second battery strings which are connected in parallel, and battery pieces of each second battery string are arranged along the first direction; and at the intersection position of the second battery string group and the third battery string group, the battery pieces of the second battery string group and the battery pieces of the third battery string group have an overlapping area. By adopting the scheme, the generation power of the photovoltaic module can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic, in particular to a photovoltaic module. BACKGROUND

[0002] With the development of photovoltaic technology, the demand for high power of photovoltaic modules is increasing, and the application range of photovoltaic modules has become more and more extensive, and the size of the cell pieces in the photovoltaic modules has gradually increased.

[0003] The photovoltaic module gradually appears multi-slice, and the current of a single string of cell strings is large, which causes a large power loss of the photovoltaic module as a whole. SUMMARY

[0004] Therefore, it is necessary to provide a photovoltaic module capable of improving the overall power of the photovoltaic module in view of the above technical problems.

[0005] A photovoltaic module comprises:

[0006] A first cell string group (10) comprising a plurality of first cell strings in parallel, and cell pieces of each first cell string are arranged along a first direction;

[0007] A second cell string group (20) and a third cell string group (30) oppositely arranged along the first direction; the second cell string group (20) and the third cell string group (30) each comprise two oppositely arranged cell subgroups in parallel, each cell subgroup is connected in series with the first cell string group (10), and each cell subgroup comprises a plurality of second cell strings in parallel, and cell pieces of each second cell string are arranged along the first direction;

[0008] At the intersection position of the second cell string group (20) and the third cell string group (30), the cell pieces of the second cell string group (20) and the cell pieces of the third cell string group (30) have an overlapping area.

[0009] In one embodiment, the second cell string group (20) comprises a first cell subgroup (21) and a second cell subgroup (22), and the third cell string group (30) comprises a third cell subgroup (23) and a fourth cell subgroup (24);

[0010] The photovoltaic module further comprises:

[0011] A first bus bar (41) arranged on one side of the first cell string group (10) and the surface of the first cell subgroup (21) along a second direction;

[0012] A second bus bar (42) arranged on the other side of the first cell string group (10) and the surface of the fourth cell subgroup (24) along the second direction.

[0013] In one embodiment, the photovoltaic module further comprises:

[0014] a first electrical connection (31) in communication with the first busbar (41) and extending from the first sub-string (21) to the second sub-string (22) along the first direction;

[0015] a second electrical connection (32) in communication with the second busbar (42) and extending from the third sub-string (23) to the fourth sub-string (24) along the first direction.

[0016] In one embodiment, the photovoltaic module further comprises:

[0017] a third busbar (43) disposed on the surface of the second sub-string (22) along the second direction and in communication with the first electrical connection (31);

[0018] a fourth busbar (44) disposed on the surface of the third sub-string (23) along the second direction and in communication with the second electrical connection (32).

[0019] In one embodiment, the photovoltaic module further comprises:

[0020] a fifth busbar (45) and a sixth busbar (46) oppositely disposed on the surface of the first string (10) along the second direction.

[0021] In one embodiment, the photovoltaic module further comprises:

[0022] a seventh busbar (47) disposed on the surface of the intersecting area of the first sub-string (21) and the second sub-string (22) along the second direction and aligned with the fifth busbar (45);

[0023] an eighth busbar (48) disposed on the surface of the intersecting area of the third sub-string (23) and the fourth sub-string (24) along the second direction and aligned with the sixth busbar (46).

[0024] In one embodiment, the photovoltaic module further comprises:

[0025] a first diode (51) disposed between the fifth busbar (45) and the sixth busbar (46);

[0026] a second diode (52) disposed between the fifth busbar (45) and the seventh busbar (47);

[0027] The third diode (53) is disposed between the sixth bus bar (46) and the eighth bus bar (48).

[0028] In one embodiment, at the intersection of the first battery string subgroup (21) and the second battery string subgroup (22), the solder strip of the first battery string subgroup (21) is bent to the back of the first battery string subgroup (21) and connected to the busbar on the back of the first battery string subgroup (21); the solder strip of the second battery string subgroup (22) is bent to the back of the second battery string subgroup (22) and connected to the busbar on the back of the second battery string subgroup (22).

[0029] In one embodiment, the solder strip of the first battery string (10) is bent to the back of the first battery string (10) and connected to the first busbar (41) on the back of the first battery string (10);

[0030] The solder strip of the fourth battery string (24) is bent to the back of the fourth battery string (24) and connected to the second busbar (42) on the back of the fourth battery string (24).

[0031] In one embodiment, the aspect ratio of the battery cell is 1:1 or 2:1.

[0032] The aforementioned photovoltaic module, by arranging first and second battery strings of different lengths in series and parallel, can fully utilize space, increase the proportion of cell area in the photovoltaic module, and thus increase the effective light-absorbing area of ​​the photovoltaic module, thereby ensuring the power generation of the photovoltaic module. At the same time, this arrangement allows the cells of the second battery string group (20) and the third battery string group (30) to overlap at the intersection, further increasing the cell area and improving the power generation of the photovoltaic module. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1This is a schematic diagram of the busbar arrangement scheme for a photovoltaic module in one embodiment;

[0036] Figure 2 This is a circuit equivalent diagram of a photovoltaic module busbar arrangement scheme in one embodiment;

[0037] Figure 3 This is a simplified diagram of the busbar arrangement scheme for a photovoltaic module in one embodiment;

[0038] Figure 4 This is a schematic diagram showing the overlapping placement of the battery cells in one embodiment;

[0039] Figure 5 This is a schematic diagram of the structure of the battery cell, solder strip, and separator strip in one embodiment.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100. Photovoltaic modules;

[0042] 10. First battery string group; 20. Second battery string group; 30. Third battery string group;

[0043] 21. First battery string group; 22. Second battery string group; 23. Third battery string group; 24. Fourth battery string group; 101. First battery string; 201. Second battery string;

[0044] 31. First electrical connector; 32. Second electrical connector; 41. First busbar; 42. Second busbar; 43. Third busbar; 44. Fourth busbar; 45. Fifth busbar; 46. Sixth busbar; 47. Seventh busbar; 48. Eighth busbar;

[0045] 51. First diode; 52. Second diode; 53. Third diode;

[0046] 60. Battery cell; 61. Busbar; 62. Insulation strip; 63. Welding strip. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to indicate or imply relative importance or to implicitly specify the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "fixed," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] In the description of this application, it should be understood that if terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] See Figure 1 This application provides a schematic diagram of a photovoltaic module 100, comprising:

[0052] The first battery string group 10 includes multiple first battery strings connected in parallel, and the battery cells of each first battery string are arranged along a first direction.

[0053] A second battery string group 20 and a third battery string group 30 are arranged opposite to each other along a first direction; each of the second battery string group 20 and the third battery string group 30 includes two battery string subgroups arranged opposite to each other and connected in parallel, each battery string subgroup is connected in series with the first battery string group 10, each battery string subgroup includes multiple parallel second battery strings, and the battery cells of each second battery string are arranged along the first direction.

[0054] At the intersection of the second battery string group 20 and the third battery string group 30, there is an overlapping area between the battery cells of the second battery string group 20 and the battery cells of the third battery string group 30.

[0055] In this embodiment, the photovoltaic module 100 is generally rectangular. The length direction of the photovoltaic module 100 is defined as the first direction, and the width direction of the photovoltaic module 100 is defined as the second direction. The first direction and the second direction are perpendicular.

[0056] For example, such as Figure 1 and Figure 2 As shown, the first battery string group 10 includes four first battery strings 101. Each first battery string includes multiple battery cells arranged along a first direction. The battery cells in each first battery string are connected in series, and the four first battery strings are connected in parallel.

[0057] The second battery string group 20 and the third battery string group 30 are arranged opposite to each other along the first direction. The second battery string group 20 includes a first battery string subgroup 21 and a second battery string group 22 arranged opposite to each other. The third battery string group 30 includes a third battery string group 23 and a fourth battery string group 24.

[0058] The second battery string group 20 includes two battery string subgroups arranged opposite each other and connected in parallel, that is, the first battery string group 21 and the second battery string group 22 are connected in parallel. Each battery string group includes multiple parallel second battery strings, such as... Figure 1 As shown, the first battery string subgroup 21 includes two second battery strings 201, and the two second battery strings 201 are connected in parallel. See [link / reference]. Figure 2 .

[0059] Similarly, the third battery string group 30 includes two battery string subgroups connected in parallel, that is, the third battery string subgroup 23 and the fourth battery string group 24 are connected in parallel. Likewise, both the third battery string group 23 and the fourth battery string group 24 include multiple parallel second battery strings.

[0060] Each second battery string is also connected in series along the first direction. The difference lies in the position of the positive and negative terminals of the cells in some second battery strings compared to the first battery string, resulting in different current flows. For example, a cell with a positive terminal on the left and a negative terminal on the right will have opposite current flows compared to a cell with a negative terminal on the left and a positive terminal on the right. However, the positions of the positive and negative terminals of the cells in the parallel second battery strings within the same battery string subgroup are the same. Figure 1 and Figure 2 As shown, the second battery string group 20 includes a first battery string sub-group 21 and a second battery string group 22 connected in parallel. After being connected in parallel, they are connected in series with the first battery string group 10. That is, the current I flowing out of the first battery string group is split into two paths, flowing to the first battery string sub-group 21 and the second battery string group 22 respectively. The current flowing through both the first battery string sub-group 21 and the second battery string group 22 is... Similarly, the third battery string group 30 includes a third battery string sub-group 23 and a fourth battery string group 24 connected in parallel. After being connected in parallel, they are connected in series with the first battery string group 10. The current flowing through the third battery string sub-group 23 and the fourth battery string group 24 is also... .

[0061] See Figure 2 Since the second battery string group 20 and the third battery string group 30 are connected in series with the first battery string group 10, no series connection of the battery cells is required at the intersection of the second battery string group 20 and the third battery string group 30. Therefore, at this intersection, the battery cells of the second battery string group 20 and the third battery string group 30 can be stacked. Taking any pair of battery cells as an example, such as Figure 4 The diagram illustrates two overlapping solar cells. 60 represents a solar cell, with the front sides (corresponding to the positive electrode) of both cells facing down. 61 is a busbar, and 63 is a solder strip. There is an overlapping area between the two solar cells, denoted as d. In some embodiments, the width d of the overlapping area is 0.5 mm. The width d is determined based on the width of the solar cells and is designed to be opaque, maximizing space utilization and increasing the solar cell area.

[0062] The photovoltaic module provided in this embodiment, through the series and parallel arrangement of first and second cell strings of different lengths, can fully utilize space, increase the proportion of cell area in the photovoltaic module, and thus increase the effective light-absorbing area of ​​the photovoltaic module, thereby ensuring the power generation of the photovoltaic module. Simultaneously, this arrangement allows the cells of the second cell string group 20 and the third cell string group 30 to overlap at the intersection, further increasing the cell area and improving the power generation of the photovoltaic module.

[0063] In one exemplary embodiment, such as Figure 1 As shown, the second battery string group 20 includes a first battery string subgroup 21 and a second battery string group 22; the third battery string group 30 includes a third battery string group 23 and a fourth battery string group 24; the photovoltaic module further includes: a first busbar 41, disposed along a second direction on one side of the first battery string group 10 and on the surface of the first battery string group 21; and a second busbar 42, disposed along a second direction on the other side of the first battery string group 10 and on the surface of the fourth battery string group 24.

[0064] See Figure 1The first busbar 41 is disposed on the surface of a row of battery cells on one side edge of the first battery string group 10 and the surface of the battery cells on the edge of the first battery string subgroup 21. It extends from the first battery string group 10 along the second direction to the first battery string group 21 and is used to collect the current of each first battery string in the first battery string group 10 and output it. The output current flows into the first battery string group 21 and the second battery string group 22 respectively.

[0065] Similarly, the second busbar 42 is disposed on the surface of a row of battery cells on the other side edge of the first battery string group 10 and the surface of the battery cells on the edge of the first battery string subgroup 21, extending from the first battery string group 10 along the second direction to the fourth battery string subgroup 24, for collecting the current of each first battery string in the first battery string group 10 and outputting it, and the output current flows into the third battery string group 23 and the fourth battery string group 24 respectively.

[0066] In this embodiment, the first battery string group 10 and the second battery string group 20 are electrically connected through the first busbar 41, and the first battery string group 10 and the third battery string group 30 are electrically connected through the setting of the second busbar 42.

[0067] In an exemplary embodiment, the photovoltaic module further includes: a first electrical connector 31, connected to a first busbar 41, extending along a first direction from a first battery string group 21 to a second battery string group 22; and a second electrical connector 32, connected to a second busbar 42, extending along a first direction from a third battery string group 23 to a fourth battery string group 24.

[0068] See Figures 1 to 3 The first electrical connector 31 is connected to the first busbar 41 and extends along the first direction from the first battery string group 21 to the second battery string group 22. Thus, the output current of the first busbar 41 can be introduced into the second battery string group 22. That is, after the first busbar 41 gathers the current of the first battery string group 10, 1 / 2 of the current I flows into the first battery string group 21, and the other 1 / 2 flows into the second battery string group 22 through the first electrical connector 31.

[0069] Similarly, the second electrical connector 32 is connected to the second busbar 42 and extends along the first direction from the third battery string group 23 to the fourth battery string group 24. Thus, the output current of the second busbar 42 can be introduced into the fourth battery string group 24. That is, after the second busbar 42 gathers the current of the first battery string group 10, 1 / 2 of the current I flows into the third battery string group 23, and the other 1 / 2 flows into the fourth battery string group 24 through the second electrical connector 32.

[0070] Both the first electrical connector 31 and the second electrical connector 32 can be understood as jumpers, and their material can be copper. They have a certain internal resistance. Since the current flowing through the two electrical connectors is only 1 / 2 of the current of the first battery string 10, according to the power formula... The resulting power loss is only 1 / 4 of the original current, thus reducing power loss.

[0071] In this embodiment, the first electrical connector 31 allows the current of the first battery string group 10 to flow into the second battery string subgroup 22, and the second electrical connector 32 allows the current of the first battery string group 10 to flow into the fourth battery string subgroup 22.

[0072] In an exemplary embodiment, the photovoltaic module further includes: a third busbar 43 disposed along a second direction on the surface of the second battery string group 22 and connected to the first electrical connector 31; and a fourth busbar 44 disposed along a second direction on the surface of the third battery string group 23 and connected to the second electrical connector 32.

[0073] See Figures 1 to 3 On the surface of the second battery string group 22, near the intersection of the second battery string group 20 and the third battery string group 30, a third busbar 43 is also provided, which is connected to the first electrical connector 31 and is used to distribute the current transmitted from the first electrical connector 31 to each solder strip, so that it flows into each battery string of the second battery string group 22.

[0074] Similarly, on the surface of the third battery string subgroup 23, near the intersection of the second battery string subgroup 20 and the third battery string subgroup 30, a fourth busbar 44 is provided, which is connected to the second electrical connector 32 and is used to distribute the current transmitted from the second electrical connector 32 to each solder strip, so that it flows into each battery string of the third battery string subgroup 23.

[0075] In this embodiment, the third busbar 43, in cooperation with the first electrical connector 31, allows the current of the first battery string group 10 to flow to the second battery string subgroup 22; and the fourth busbar 44, in cooperation with the second electrical connector 32, allows the current of the first battery string group 10 to flow to the third battery string subgroup 23.

[0076] In an exemplary embodiment, the photovoltaic module further includes a fifth busbar 45 and a sixth busbar 46, which are disposed opposite to each other and are both disposed on the surface of the first battery string 10 along the second direction.

[0077] See Figures 1 to 3 A fifth busbar 45 and a sixth busbar 46 are also provided on the surface of the first battery string group 10. They are arranged opposite to each other and extend along the second direction to collect the current of each first battery string in the first battery string group 10.

[0078] It should be noted that the fifth busbar 45 and the sixth busbar 46 are not used when all the solar cells are in normal condition. They are used when there is an abnormality in a solar cell between the fifth busbar 45 and the sixth busbar 46. Specifically, a first diode 51 is installed between the fifth busbar 45 and the sixth busbar 46. (See [reference]). Figure 2 It is connected to the fifth busbar 45 and the sixth busbar 46. When there is an abnormality in the battery cell between the fifth busbar 45 and the sixth busbar 46, the first diode 51 connects the fifth busbar 45 and the sixth busbar 46 to establish a circuit.

[0079] In this embodiment, the fifth busbar 45 and the sixth busbar 46 are configured to enable current collection when there is an abnormality in the battery cell between the fifth busbar 45 and the sixth busbar 46.

[0080] In an exemplary embodiment, the photovoltaic module further includes: a seventh busbar 47, disposed along a second direction on the surface of the cell in the intersection area of ​​the first cell string group 21 and the second cell string group 22, and aligned with the fifth busbar 45; and an eighth busbar 48, disposed along a second direction on the surface of the cell in the intersection area of ​​the third cell string group 23 and the fourth cell string group 24, and aligned with the sixth busbar 46.

[0081] See Figures 1 to 3 A seventh busbar 47 is also provided on the surface of the battery cells in the intersection area of ​​the first battery string group 21 and the second battery string group 22 to collect the current of the first battery string group 21 and the second battery string group 22. Specifically, after the current of the first battery string group 10 is collected by the first busbar 41, half of it flows into the first battery string group 21, and the other half flows into the second battery string group 22 through the first electrical connector 31. Further, the current of each battery string in the first battery string group 21 and the current of each battery string in the second battery string group 22 are collected by the seventh busbar 47 and then output. Moreover, the position of the seventh busbar 47 is set according to the position of the fifth busbar 45, and the two are aligned so that they can be connected through the second diode 52.

[0082] Similarly, an eighth busbar 48 is provided on the surface of the battery cells in the intersection area of ​​the third battery string group 23 and the fourth battery string group 24 to collect the current of the third battery string group 23 and the fourth battery string group 24. Specifically, after the current of the first battery string group 10 is collected by the second busbar 42, half of it flows into the third battery string group 23, and the other half flows into the fourth battery string group 24 through the first electrical connector 31. Furthermore, the current of each battery string in the third battery string group 23 and the current of each battery string in the fourth battery string group 24 are collected by the eighth busbar 48 and then output. Moreover, the position of the eighth busbar 48 is set according to the position of the sixth busbar 46, and the two are aligned so that they can be connected through the third diode 53.

[0083] In this embodiment, the current of the first battery string group 21 and the second battery string group 22 can be converged and output by setting the seventh bus bar 47, and the current of the third battery string group 23 and the fourth battery string group 24 can be converged and output by setting the eighth bus bar 48.

[0084] In an exemplary embodiment, the photovoltaic module further includes: a first diode 51 disposed between the fifth busbar 45 and the sixth busbar 46; a second diode 52 disposed between the fifth busbar 45 and the seventh busbar 47; and a third diode 53 disposed between the sixth busbar 46 and the eighth busbar 48.

[0085] For example, the first diode 51, the second diode 52, and the third diode 53 are all bypass diodes, see reference. Figure 2 When all battery strings are generating power normally, the current direction is opposite to the diode's allowed direction, and the diode is in reverse cutoff state, which is equivalent to an open circuit, and all current flows through the battery string. When a battery string is blocked, it will generate a reverse voltage, which will cause the diode connected in parallel with it to become forward biased, thus turning it on.

[0086] See Figures 1 to 3 The first diode 51 is disposed between the fifth busbar 45 and the sixth busbar 46 so as to conduct when there is an abnormality in the battery cell disposed between the fifth busbar 45 and the sixth busbar 46, thereby establishing a path between the fifth busbar 45 and the sixth busbar 46.

[0087] The second diode 52 is disposed between the fifth busbar 45 and the seventh busbar 47 so as to conduct when there is an abnormality in the battery string of the second battery string group 20.

[0088] The third diode 53 is disposed between the sixth bus bar 46 and the eighth bus bar 48 so as to conduct when there is an abnormality in the battery string of the third battery string group 30.

[0089] In this embodiment, the arrangement of the first diode 51, the second diode 52 and the third diode 53 enables fault bypass to protect the solar cells in the photovoltaic module.

[0090] In an exemplary embodiment, in the intersection area of ​​the first battery string group 21 and the second battery string group 22, one end of the solder strip of the first battery string group 21 is bent to the back of the first battery string group 21 and connected to the busbar on the back of the first battery string group 21; one end of the solder strip of the second battery string group 22 is bent to the back of the second battery string group 22 and connected to the busbar on the back of the second battery string group 22.

[0091] See Figure 5 This is a schematic diagram illustrating the structure of a battery cell, solder ribbon, and insulating strip in one embodiment. 60 represents a battery cell; 61 represents a busbar; 62 represents an insulating strip; and 63 represents a solder ribbon. In the intersection area of ​​the first battery string group 21 and the second battery string group 22, the solder ribbon of the first battery string group 21 is as follows... Figure 5 As shown, one end of the solder strip is bent to the back of the first battery string group 21 and connected to the busbar on the back of the first battery string group 21. Similarly, one end of the solder strip of the second battery string group 22 is bent to the back of the second battery string group 22 and connected to the busbar on the back of the second battery string group 22.

[0092] In this embodiment, by bending the welding strips of the first battery string group 21 and the second battery string group 22 to the back side and connecting them with the busbar on the back side, the area of ​​the photovoltaic module occupied by the busbar is eliminated, thereby increasing the area occupied by the battery cell and improving the power generation of the battery cell.

[0093] Similarly, in an exemplary embodiment, the solder ribbon of the first battery string group 10 is bent to the back of the first battery string group 10 and connected to the first busbar 41 on the back of the first battery string group 10; the solder ribbon of the fourth battery string group 24 is bent to the back of the fourth battery string group 24 and connected to the second busbar 42 on the back of the fourth battery string group 24. This eliminates the area of ​​the photovoltaic module occupied by the busbar, thereby increasing the area occupied by the battery cells and improving the power generation of the battery cells.

[0094] In one exemplary embodiment, the aspect ratio of the solar cell is 1:1 or 2:1. Exemplarily, the solar cell may also be a two-part solar cell or a four-part solar cell.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0096] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A photovoltaic module, characterized by, The photovoltaic module comprises: a first battery string group (10); the first battery string group (10) comprises a plurality of parallel first battery strings, and the battery pieces of each first battery string are arranged along a first direction; a second battery string group (20) and a third battery string group (30) oppositely arranged along the first direction; the second battery string group (20) and the third battery string group (30) each comprise two oppositely arranged parallel battery string subgroups, each of which is connected in series with the first battery string group (10); each battery string subgroup comprises a plurality of parallel second battery strings, and the battery pieces of each second battery string are arranged along the first direction; at the intersection position of the second battery string group (20) and the third battery string group (30), the battery pieces of the second battery string group (20) and the battery pieces of the third battery string group (30) have an overlapping area.

2. The photovoltaic module of claim 1, wherein, The second battery string group (20) comprises a first battery string subgroup (21) and a second battery string subgroup (22); the third battery string group (30) comprises a third battery string subgroup (23) and a fourth battery string subgroup (24); The photovoltaic module further comprises: a first bus bar (41) arranged on one side of the first battery string group (10) and the surface of the first battery string subgroup (21) along a second direction; a second bus bar (42) arranged on the other side of the first battery string group (10) and the surface of the fourth battery string subgroup (24) along the second direction.

3. The photovoltaic module of claim 2, wherein, The photovoltaic module further comprises: a first electrical connection (31) connected in communication with the first bus bar (41) and extending from the first battery string subgroup (21) to the second battery string subgroup (22) along the first direction; a second electrical connection (32) connected in communication with the second bus bar (42) and extending from the third battery string subgroup (23) to the fourth battery string subgroup (24) along the first direction.

4. The photovoltaic module of claim 3, wherein, The photovoltaic module further comprises: a third bus bar (43) arranged on the surface of the second battery string subgroup (22) along the second direction and connected in communication with the first electrical connection (31); a fourth bus bar (44) arranged on the surface of the third battery string subgroup (23) along the second direction and connected in communication with the second electrical connection (32).

5. The photovoltaic module of claim 2, wherein, The photovoltaic module further comprises: a fifth bus bar (45) and a sixth bus bar (46) oppositely arranged and both arranged on the surface of the first battery string group (10) along the second direction.

6. The photovoltaic module of claim 5, wherein, The photovoltaic module further comprises: a seventh bus bar (47) arranged on the surface of the battery pieces at the intersection area of the first battery string subgroup (21) and the second battery string subgroup (22) along the second direction and aligned with the fifth bus bar (45); an eighth bus bar (48) arranged on the surface of the battery pieces at the intersection area of the third battery string subgroup (23) and the fourth battery string subgroup (24) along the second direction and aligned with the sixth bus bar (46).

7. The photovoltaic module of claim 6, wherein, The photovoltaic module further comprises: a first diode (51) arranged between the fifth bus bar (45) and the sixth bus bar (46). A second diode (52) is arranged between the fifth bus bar (45) and the seventh bus bar (47); A third diode (53) is arranged between the sixth bus bar (46) and the eighth bus bar (48).

8. The photovoltaic module of claim 2, wherein, In the intersection area of the first battery string sub-group (21) and the second battery string sub-group (22), the welding band of the first battery string sub-group (21) is bent to the back surface of the first battery string sub-group (21) and connected with the bus bar on the back surface of the first battery string sub-group (21); the welding band of the second battery string sub-group (22) is bent to the back surface of the second battery string sub-group (22) and connected with the bus bar on the back surface of the second battery string sub-group (22).

9. The photovoltaic module of claim 2, wherein, The welding band of the first battery string group (10) is bent to the back surface of the first battery string group (10) and connected with the first bus bar (41) on the back surface of the first battery string group (10); The welding band of the fourth battery string sub-group (24) is bent to the back surface of the fourth battery string sub-group (24) and connected with the second bus bar (42) on the back surface of the fourth battery string sub-group (24).

10. The photovoltaic module of claim 1, wherein, The aspect ratio of the battery piece is 1:1 or 2:1.

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