Photovoltaic module

Abstract

The utility model discloses a photovoltaic module, which comprises a battery layer, a back plate and a bus bar, the back plate and the bus bar are positioned on one side of the battery layer, and the battery layer comprises a plurality of battery unit groups which are connected in series. The first bus bar and the third bus bar are partially located on one side, facing the battery layer, of the back plate, the second bus bar is completely located on one side, facing the battery layer, of the back plate, the first bus bar and the second bus bar are each provided with a bent section which is bent towards the back plate and penetrates through the back plate, and the second bus bar is not provided with a bent section. According to the photovoltaic module provided by the utility model, the first bus bar and the third bus bar which are respectively arranged at the two sides of the battery layer comprise the bending sections which penetrate through the back plate and are used for being electrically connected with the external power supply, and the second bus bar is not provided with the bending section and does not need to penetrate through the back plate, so that the total length of the bus bars is shortened, and the production cost and the maintenance cost of the photovoltaic module are saved.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic technology, specifically relating to a photovoltaic module. Background Technology

[0002] Busbars are key conductive components in photovoltaic modules. During the manufacturing process of photovoltaic modules, busbars are electrically connected to the solar cells to collect the current generated by individual solar cells and form a complete circuit through series or parallel connection, ultimately transmitting electrical energy to the output end of the photovoltaic module.

[0003] The current busbar design in existing photovoltaic modules has the following drawbacks: the busbars used for parallel battery strings need to have a bending section, which runs through the backsheet of the photovoltaic module and is electrically connected to the external modules. Each external module needs to be connected to the bending sections of two busbars, which increases the total length of the busbars and increases the production cost of the photovoltaic modules.

[0004] Therefore, it is necessary to provide a photovoltaic module to address the aforementioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a photovoltaic module that can shorten the total length of the busbar, thereby reducing the production and maintenance costs of the photovoltaic module.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] A photovoltaic module, the photovoltaic module comprising:

[0008] The battery layer and a backplate located on one side of the battery layer, wherein the battery layer includes a plurality of battery cell groups arranged in series along a first direction, and each battery cell group includes a plurality of battery cells;

[0009] The busbar includes a first busbar and a third busbar partially located on the backplate facing the battery layer side, and at least one second busbar wholly located on the backplate facing the battery layer side. The second busbar is located between the first busbar and the third busbar. The first busbar is electrically connected to a first battery cell group connected in series in the battery layer along a first direction. The third busbar is electrically connected to the last battery cell group connected in series in the battery layer along the first direction. The second busbar is electrically connected to two adjacent battery cell groups. The first busbar has a first bent section that bends toward the backplate and penetrates the backplate. The third busbar has a third bent section that bends toward the backplate and penetrates the backplate.

[0010] In one or more embodiments of this utility model, the first busbar has a first straight segment extending along a first direction, and the first bent segment is located at one end of the first straight segment near or away from the second busbar; and / or,

[0011] The third busbar has a third straight segment extending along a first direction, and the third bent segment is located at one end of the third straight segment that is close to or far from the second busbar.

[0012] In one or more embodiments of this utility model, a first through hole and a second through hole are provided through the back plate, the first bent segment passes through the first through hole, the size of the first through hole is larger than the size of the first bent segment, and the third bent segment passes through the second through hole, the size of the second through hole is larger than the size of the third bent segment.

[0013] In one or more embodiments of this utility model, the difference L1 between the dimension of the first through hole along the first direction and the width of the first bent segment satisfies: 2mm≤L1≤4mm; and / or, the difference L2 between the dimension of the second through hole along the first direction and the width of the third bent segment satisfies: 2mm≤L2≤4mm.

[0014] In one or more embodiments of the present invention, the photovoltaic module further includes a first junction box and a second junction box located on the side of the back sheet away from the battery layer, respectively, the first bent section passing through the back sheet and electrically connected to the first junction box, and the third bent section passing through the back sheet and electrically connected to the second junction box.

[0015] In one or more embodiments of this utility model, no diodes are provided in the first junction box and the second junction box.

[0016] In one or more embodiments of the present invention, the photovoltaic module further includes a plurality of solder strips located on the side of the backsheet facing the battery layer, some of the battery cells in the battery cell group are connected in series through the solder strips, and some of the battery cells in the battery cell group are electrically connected to the busbar through the solder strips.

[0017] In one or more embodiments of the present invention, the battery cells in the battery cell group are back-contact battery cells, with the back side of the back-contact battery cell facing the back plate, and the solder strip is welded to the back side of the back-contact battery cell.

[0018] In one or more embodiments of the present invention, the battery cell group includes a first battery cell and a second battery cell, wherein the first battery cell and the second battery cell are connected in parallel.

[0019] The first battery unit includes a first battery string and a second battery string arranged in parallel, and the first battery string and the second battery string are connected in series. The second battery unit includes a third battery string and a fourth battery string arranged in parallel, and the third battery string and the fourth battery string are connected in series.

[0020] The first, second, third, and fourth battery strings each include multiple battery cells connected in series. Multiple solder strips are electrically connected to the multiple battery cells in the first, second, third, and fourth battery strings. The multiple solder strips extend along the string arrangement direction of the multiple battery cells and are parallel to each other.

[0021] In one or more embodiments of this utility model, for the first battery cell group connected in series along a first direction: the first battery string and the third battery string are electrically connected to the first busbar via the solder strip, and the second battery string and the fourth battery string are electrically connected to the second busbar adjacent to the first busbar via the solder strip; and / or,

[0022] For the last battery cell group connected in series along the first direction in the battery layer: the first battery string and the third battery string are electrically connected to the second busbar adjacent to the third busbar via the solder strip, and the second battery string and the fourth battery string are electrically connected to the third busbar via the solder strip; and / or,

[0023] For the battery cell group between the first and last battery cell groups connected in series along the first direction: the first battery string and the third battery string are electrically connected to the second busbar via the solder strip, and the second battery string and the fourth battery string are both electrically connected to the adjacent second busbar via the solder strip.

[0024] In one or more embodiments of this utility model, the busbar further includes a fourth busbar and a fifth busbar; the first battery string and the second battery string in the same first battery cell are connected in series with the fourth busbar via the solder strip, and the third battery string and the fourth battery string in the same second battery cell are connected in series with the fifth busbar via the solder strip.

[0025] Compared with the prior art, the photovoltaic module of this utility model has a first busbar and a third busbar located on both sides of the battery layer, which include a bent section that penetrates the back sheet and is used for electrical connection with an external power source. The second busbar does not have a bent section and does not need to penetrate the back sheet, which shortens the total length of the busbar and saves the production and maintenance costs of the photovoltaic module. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a side view of the photovoltaic module in Embodiment 1 of this utility model;

[0028] Figure 2 This is a schematic diagram of the photovoltaic module in Embodiment 1 of this utility model;

[0029] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0030] Figure 4 for Figure 2 A magnified view of part B in the middle section;

[0031] Figure 5 for Figure 2 Another enlarged view of part A in the middle;

[0032] Figure 6 This is a planar structural diagram of the through holes and bends in the existing design;

[0033] Figure 7 These are planar structural diagrams of the photovoltaic modules in Embodiments 1 and 2 of this utility model;

[0034] Figure 8 This is a schematic diagram of the photovoltaic module in Embodiment 2 of this utility model;

[0035] Figure 9 This is another planar structural diagram of the photovoltaic module in Embodiment 1 of this utility model;

[0036] Figure 10 This is another planar structural diagram of the photovoltaic module in Embodiment 2 of this utility model;

[0037] Figure 11 This is another planar structural diagram of the photovoltaic module in Embodiment 2 of this utility model;

[0038] Figure 12 This is another planar structural diagram of the photovoltaic module in Embodiment 2 of this utility model.

[0039] Key reference numerals: 10, Battery layer; 101, Battery cell; 11, Battery cell group; 111, First battery cell; 1111, First battery string; 1112, Second battery string; 112, Second battery cell; 1121, Third battery string; 1122, Fourth battery string; 20, Backplate; 21, First through hole; 22, Second through hole; 30, Busbar; 31, First busbar; 311, First bend; 32, Second busbar; 33, Third busbar; 331, Third bend; 34, Fourth busbar; 35, Fifth busbar; 40, Junction box; 401, First junction box; 402, Second junction box; 50, Welding strip. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0041] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0042] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0043] This utility model discloses a photovoltaic module, which includes:

[0044] The battery layer and a backplate located on one side of the battery layer, the battery layer includes multiple battery cell groups arranged in series along a first direction, each battery cell group including multiple battery cells;

[0045] The busbar includes a first busbar and a third busbar partially located on the backsheet facing the battery layer side, and at least one second busbar wholly located on the backsheet facing the battery layer side. The second busbar is located between the first busbar and the third busbar. The first busbar is electrically connected to the first battery cell group connected in series along the first direction in the battery layer. The third busbar is electrically connected to the last battery cell group connected in series along the first direction in the battery layer. The second busbar is electrically connected to two adjacent battery cell groups. The first busbar has a first bent section that bends toward the backsheet and penetrates the backsheet. The third busbar has a third bent section that bends toward the backsheet and penetrates the backsheet.

[0046] The photovoltaic module of this invention only has bends on the first and second busbars located on both sides of the battery layer, while the other second busbars are not bent, which saves on the production and maintenance costs of the photovoltaic module.

[0047] In one embodiment, the first busbar has a first straight segment extending in a first direction, and a first bent segment located at one end of the first straight segment near or away from the second busbar; and / or, the third busbar has a third straight segment extending in the first direction, and a third bent segment located at one end of the third straight segment near or away from the second busbar.

[0048] In one embodiment, a first through hole and a second through hole are provided through the back plate, a first bent section passes through the first through hole, the size of the first through hole is larger than the size of the first bent section, and a third bent section passes through the second through hole, the size of the second through hole is larger than the size of the third bent section.

[0049] In one embodiment, the difference L1 between the dimension of the first through hole along the first direction and the width of the first bend segment satisfies: 2mm≤L1≤4mm; and / or, the difference L2 between the dimension of the second through hole along the first direction and the width of the third bend segment satisfies: 2mm≤L2≤4mm.

[0050] In one embodiment, the battery cells in the battery cell group are back-contact battery cells, with the back side of the back-contact battery cell facing the back plate, and solder strips are welded to the back side of the back-contact battery cell.

[0051] The present invention will be further described below with reference to specific embodiments.

[0052] Example 1:

[0053] Reference Figure 1 and Figure 2 As shown, this embodiment provides a photovoltaic module, which includes a cell layer 10, a backsheet 20 located on one side of the cell layer 10, a junction box 40 located on the side of the backsheet 20 away from the cell layer 10, and a busbar 30 located on the side of the backsheet 20 facing the cell layer 10.

[0054] The battery layer 10 of this embodiment includes a plurality of battery unit groups 11 arranged in series in sequence along the first direction (i.e., the direction indicated by the y-axis), and each battery unit group 11 includes a plurality of battery chips 101.

[0055] The bus bar 30 of this embodiment includes a first bus bar 31 and a third bus bar 33 partially located on the side of the backplane 20 facing the battery layer 10 (i.e., Figure 2 the inner side of the backplane 20 shown), and a second bus bar 321 and a second bus bar 322 entirely located on the side of the backplane 20 facing the battery layer 10. The second bus bar 321 and the second bus bar 322 are arranged at intervals between the first bus bar 31 and the third bus bar 33. The first bus bar 31 is electrically connected to the first battery unit group 11 connected in series along the first direction of the battery layer 10, the third bus bar 33 is electrically connected to the last battery unit group 11 connected in series along the first direction of the battery layer 10, and the second bus bar 321 and the second bus bar 322 are respectively electrically connected to two adjacent battery unit groups 11.

[0056] Further, the junction box 40 of this embodiment includes a first junction box 401 and a second junction box 402 respectively located on the side of the backplane 20 away from the battery layer 10 (i.e., Figure 2 the outer side of the backplane 20 shown), and no diodes are provided in the first junction box 401 and the second junction box 402.

[0057] It should be understood that the external power supply in this embodiment is described by taking the junction box as an example. In other embodiments, other types of power supply devices can also be used, which will not be elaborated here one by one.

[0058] The backplane 20 of this embodiment is provided with a first through hole 21 and a second through hole 22 penetrating therethrough, and the position of the first junction box 401 corresponds to the position of the first through hole 21, and the position of the second junction box 402 corresponds to the position of the second through hole 22. It should be noted that Figure 1 and Figure 2 are only for clearly illustrating the positional relationship of each device in the photovoltaic module, and do not represent the actual distance between the backplane 20 and the battery layer 10. And in an optional implementation manner, a packaging material layer or an insulating layer is provided between the backplane 20 and the battery layer 10.

[0059] Refer Figure 3 and Figure 5 As shown, the first bus bar 31 of this embodiment has a first bending segment 311 bent towards the backplane 20. The first bending segment 311 penetrates through the first through hole 21 and is electrically connected to the first junction box 401. It can be understood that the size of the first through hole 21 of this embodiment is larger than the size of the first bending segment 311.

[0060] Refer Figure 4As shown, the third bus bar 33 of this embodiment has a third bent segment 331 that bends towards the backplane 20. Similarly, it can be known that the third bent segment 331 passes through the second through hole 22 and is electrically connected to the second junction box 402, and the size of the second through hole 22 is larger than the size of the third bent segment 331.

[0061] The material of the backplane 20 of this embodiment is one of tempered glass, EVA (ethylene-vinyl acetate copolymer), and TPE (thermoplastic elastomer).

[0062] Refer Figure 3 and Figure 4 As shown, in this embodiment, the first bus bar 31 has a first straight segment extending in the first direction, and the first bent segment 311 is located at one end of the first straight segment close to the second bus bar 32. The third bus bar 33 has a third straight segment extending in the first direction, and the third bent segment 331 is located at one end of the third straight segment close to the second bus bar 32.

[0063] Combined Figure 9 As shown, in this embodiment, the position of the first junction box 401 corresponds to the first bent segment 311, and the position of the second junction box 402 corresponds to the third bent segment 331.

[0064] Refer Figure 6 As shown, taking the example that each through hole of the backplane 20 in the conventional design needs to accommodate two bent segments (i.e., the illustrated bent segment 601 and bent segment 602): A gap w2 must be set between the bent segment 601 and the bent segment 602 to avoid circuit failure of the battery layer 10 caused by the contact between the bent segment 601 and the bent segment 602. For the bent segment 601 and bent segment 602 with a width w1 of 6 mm, the gap w2 is at least 4 mm. In addition, to ensure that the bent segment can smoothly pass through the through hole and does not rub against the edge of the through hole, a certain gap also needs to be reserved between the edge of the bent segment 601 and the through hole and between the edge of the bent segment 602 and the through hole. Therefore, the difference between the diameter of the first through hole 21 and the width of the bent segment 601 in the conventional design is not less than 4 mm.

[0065] The first through hole 21 and the second through hole 22 in this embodiment are circular. The difference L1 between the diameter of the first through hole 21 (i.e., the dimension of the first through hole 21 in the first direction) and the width of the first bent segment 311 satisfies: 2 mm ≤ L1 ≤ 4 mm, and L1 can be specifically set to 2 mm, 3 mm, 3.5 mm, or 4 mm. The difference L2 between the diameter of the second through hole 22 (i.e., the dimension of the second through hole 22 in the first direction) and the width of the third bent segment 331 satisfies: 2 mm ≤ L2 ≤ 4 mm, and L2 can be specifically set to 2 mm, 3 mm, 3.5 mm, or 4 mm.

[0066] In this embodiment, when the width of the first bending segment 311 is 6mm, the minimum size of the first through hole 21 along the first direction can be set to 8mm. The difference L1 between the size of the first through hole 21 along the first direction and the width of the first bending segment 311 is 2mm. Therefore, compared with the conventional design, this embodiment reduces the size of the first through hole 21 and the second through hole 22.

[0067] In other alternative embodiments, the first through-hole 21 and the second through-hole 22 are shaped as at least one of ellipse, oblong, polygon, and rectangle. Similarly, since the gap w2 does not need to be considered, even if the first through-hole 21 and the second through-hole 22 are other shapes, the sizes of the first through-hole 21 and the second through-hole 22 in this embodiment can still be greatly reduced compared to the sizes of the first through-hole 21 and the second through-hole 22 in conventional photovoltaic module designs.

[0068] In other alternative embodiments, when the first through hole 21 and the second through hole 22 are rectangular in shape, the four corners of the first through hole 21 and the second through hole 22 are rounded.

[0069] In conventional designs, each second busbar 32 requires bent sections at both ends and through-holes in the corresponding positions of the backsheet 20 to electrically connect the second busbar 32 to the junction box 40. Therefore, the total length of the busbars required in the photovoltaic module is longer. In this embodiment, the second busbar 32 does not require bent sections, reducing the total length of the busbar by approximately 80mm, thus shortening the overall length of the busbar 30 and saving on the production cost of the photovoltaic module.

[0070] In conventional designs, if a photovoltaic module has two second busbars 32, three through holes need to be made on the backsheet 20. Furthermore, each through hole requires space to accommodate two bending segments, resulting in relatively large through hole sizes, increasing manufacturing costs and the risk of edge breakage. In this embodiment, only a first through hole 21 and a second through hole 22 need to be made on the backsheet 20, improving manufacturing efficiency. The first through hole 21 only needs to accommodate the first bending segment 311, and the second through hole 22 only needs to accommodate the third bending segment 331, reducing the size of the first and second through holes 21 and 22, lowering the risk of stress-induced breakage, and ensuring the structural strength of the backsheet 20.

[0071] In a conventional design, bypass diodes are provided in the junction box of a photovoltaic module to prevent hot spot effects from occurring when the solar cells are shaded or malfunction. Continuous hot spot effects may cause the bypass diodes to break down and burn out, thereby damaging the junction box. However, in actual operation, the burnouts caused by hot spot effects are less frequent. Instead, they are more often caused by problems such as the quality of the bypass diodes, lightning, static electricity, or poor soldering. In addition, during the production of photovoltaic modules, the proportion of customer complaints regarding bypass diode breakdowns and poor soldering is very high. Junction box burnouts frequently occur in large-scale ground projects, and manufacturers have to bear high processing costs. In this embodiment, no diodes are provided in the first junction box 401 and the second junction box 402, which can directly save some material costs and processing costs, and can avoid junction box burnouts caused by bypass diodes, reducing the customer complaint handling costs of photovoltaic module manufacturers.

[0072] Refer Figure 1 、 Figure 2 and Figure 7 As shown in, the photovoltaic module of this embodiment further includes a plurality of solder tapes 50 located on the side of the backsheet 20 facing the cell layer 10. Some of the solar cells 101 in the battery unit group 11 are connected in series through the solder tapes 50, and some of the solar cells 101 in the battery unit group 11 are electrically connected to the bus bar 30 through the solder tapes 50.

[0073] The solar cell 101 of this embodiment is a back contact solar cell (Back Contact Solar Cell). By using a back contact solar cell, thermal management can be optimized, the operating temperature of the photovoltaic module can be reduced, and the efficiency degradation can be slowed down. Specifically, the positive and negative electrodes of the solar cell 101 are both provided on the back of the solar cell 101. The back of the solar cell 101 faces the backsheet 20, and the solder tape 50 is welded to the back of the solar cell 101.

[0074] It can be understood that the solar cell 101 in other alternative embodiments can be of other types, including but not limited to Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCON), Heterojunction with Intrinsic Thinlayer (HIT), Perovskite Solar Cells (PSC), etc., as well as various solar cells such as PERC, TOPCON, HJT, PSC, etc. that incorporate BC (Back Contact) technology.

[0075] Further, each battery cell group 11 includes a first battery cell 111 and a second battery cell 112. The first battery cell 111 and the second battery cell 112 are connected in parallel. The first battery cell 111 includes a first battery string 1111 and a second battery string 1112 arranged in parallel, and the first battery string 1111 and the second battery string 1112 are connected in series. The second battery cell 112 includes a third battery string 1121 and a fourth battery string 1122 arranged in parallel, and the third battery string 1121 and the fourth battery string 1122 are connected in series.

[0076] The first battery string 1111, the second battery string 1112, the third battery string 1121, and the fourth battery string 1122 each include a plurality of battery chips 101 connected in series. A plurality of welding tapes 50 are electrically connected to the plurality of battery chips 101 in the corresponding first battery string 1111, second battery string 1112, third battery string 1121, and fourth battery string 1122. The plurality of welding tapes 50 extend along the series arrangement direction of the plurality of battery chips 101 (i.e., the direction shown by the x-axis) and are parallel to each other.

[0077] As Figure 7 shown, the first bus bar 31 is electrically connected to the first battery cell group 11 in series along the first direction of the battery layer 10. The third bus bar 33 is electrically connected to the last battery cell group 11 in series along the first direction of the battery layer 10. The second bus bar 32 is electrically connected to two adjacent battery cell groups 11.

[0078] Further, the first bus bar 31, the second bus bar 32, and the third bus bar 33 extend along the arrangement direction of the plurality of battery cell groups 11 (i.e., the first direction) and are spaced apart in sequence.

[0079] For the first battery cell group 11 in series along the first direction of the battery layer 10: Both the first battery string 1111 and the third battery string 1121 are electrically connected to the first bus bar 31 through the welding tape 50. Both the second battery string 1112 and the fourth battery string 1122 are electrically connected to the second bus bar 32 adjacent to the first bus bar 31 through the welding tape 50.

[0080] For the last battery cell group 11 in series along the first direction of the battery layer 10: Both the first battery string 1111 and the third battery string 1121 are electrically connected to the second bus bar 32 adjacent to the third bus bar 33 through the welding tape 50. Both the second battery string 1112 and the fourth battery string 1122 are electrically connected to the third bus bar 33 through the welding tape 50.

[0081] For the battery cell groups 11 between the first battery cell group 11 and the last battery cell group 11 connected in series along the first direction of the battery layer 10: both the first battery string 1111 and the third battery string 1121 are electrically connected to the second bus bar 32 through the welding strip 50, and both the second battery string 1112 and the fourth battery string 1122 are electrically connected to the adjacent second bus bar 32 through the welding strip 50.

[0082] As Figure 7 shown, the bus bar 30 of this embodiment further includes a fourth bus bar 34 and a fifth bus bar 35. The first battery string 1111 and the second battery string 1112 within the same first battery cell 111 are connected in series to the fourth bus bar 34 through the welding strip 50, and the third battery string 1121 and the fourth battery string 1122 within the same second battery cell 112 are connected in series to the fifth bus bar 35 through the welding strip 50.

[0083] Embodiment 2:

[0084] As Figure 8 and Figure 10 shown, this embodiment provides a photovoltaic module, which is different from Embodiment 1 in that the first bus bar 31 of this embodiment has a first straight segment extending along the first direction, and the first bending segment 311 is located at one end of the first straight segment away from the second bus bar 32. The third bus bar 33 has a third straight segment extending along the first direction, and the third bending segment 331 is located at one end of the third straight segment away from the second bus bar 32.

[0085] The second bus bar 32 of this embodiment does not have a bending segment, so there is no need to consider electrically connecting the corresponding bending segment of the second bus bar 32 and the first bending segment 311 to the same junction box 40. Therefore, the position of the first bending segment 311 can be set relatively flexibly. Adaptively, the first junction box 401 and the second junction box 402 can also be adjusted to positions closer to the edge of the photovoltaic module, improving the flexibility of the photovoltaic module and making it applicable to more photovoltaic module application scenarios.

[0086] As Figure 11 shown, in other alternative embodiments, the first bending segment 311 is located at one end of the first straight segment away from the second bus bar 32, the third bending segment 331 is located at one end of the third straight segment close to the second bus bar 32, and the positions of the first junction box 401 and the second junction box 402 can be adjusted adaptively.

[0087] As Figure 12 shown, in other alternative embodiments, the first bending segment 311 is located at one end of the first straight segment close to the second bus bar 32, the third bending segment 331 is located at one end of the third straight segment away from the second bus bar 32, and the positions of the first junction box 401 and the second junction box 402 can be adjusted adaptively.

[0088] As can be seen from the above technical solutions, this utility model has the following beneficial effects:

[0089] The first and third busbars, located on both sides of the battery layer, include a bent section that penetrates the backsheet and is electrically connected to an external power source. The second busbar does not have a bent section and does not need to penetrate the backsheet, which shortens the total length of the busbars and reduces the production and maintenance costs of photovoltaic modules.

[0090] By reducing the size of the first and second through holes, the processing difficulty of the first and second through holes is reduced, while the risk of stress fracture of the first and second through holes is reduced, thus ensuring the structural strength of the back plate.

[0091] The positions of the first and third bends are adjustable, and the positions of the first and second junction boxes can be adjusted adaptively, improving the flexibility of the photovoltaic modules and making them suitable for more photovoltaic module application scenarios.

[0092] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0093] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module includes: The battery layer and a backplate located on one side of the battery layer, wherein the battery layer includes a plurality of battery cell groups arranged in series along a first direction, and each battery cell group includes a plurality of battery cells; The busbar includes a first busbar and a third busbar partially located on the backplate facing the battery layer side, and at least one second busbar wholly located on the backplate facing the battery layer side. The second busbar is located between the first busbar and the third busbar. The first busbar is electrically connected to a first battery cell group connected in series in the battery layer along a first direction. The third busbar is electrically connected to the last battery cell group connected in series in the battery layer along the first direction. The second busbar is electrically connected to two adjacent battery cell groups. The first busbar has a first bent section that bends toward the backplate and penetrates the backplate. The third busbar has a third bent section that bends toward the backplate and penetrates the backplate.

2. The photovoltaic module according to claim 1, characterized in that, The first busbar has a first straight segment extending in a first direction, and the first bent segment is located at one end of the first straight segment near or away from the second busbar; and / or, The third busbar has a third straight segment extending along a first direction, and the third bent segment is located at one end of the third straight segment that is close to or far from the second busbar.

3. The photovoltaic module according to claim 1, characterized in that, The back plate is provided with a first through hole and a second through hole. The first bent section passes through the first through hole, and the size of the first through hole is larger than the size of the first bent section. The third bent section passes through the second through hole, and the size of the second through hole is larger than the size of the third bent section.

4. The photovoltaic module according to claim 3, characterized in that, The difference L1 between the dimension of the first through hole along the first direction and the width of the first bent segment satisfies: 2mm ≤ L1 ≤ 4mm; and / or, The difference L2 between the dimension of the second through hole along the first direction and the width of the third bent segment satisfies: 2mm≤L2≤4mm.

5. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes a first junction box and a second junction box located on the side of the back panel away from the battery layer, respectively. The first bent section passes through the back panel and is electrically connected to the first junction box, and the third bent section passes through the back panel and is electrically connected to the second junction box.

6. The photovoltaic module according to claim 5, characterized in that, No diodes were installed in the first and second junction boxes.

7. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes multiple solder strips located on the side of the backsheet facing the battery layer. Some of the cells in the battery unit group are connected in series through the solder strips, and some of the cells in the battery unit group are electrically connected to the busbar through the solder strips.

8. The photovoltaic module according to claim 7, characterized in that, The battery cells in the battery cell group are back-contact battery cells, with the back side of the back-contact battery cell facing the back plate, and the solder strip is welded to the back side of the back-contact battery cell.

9. The photovoltaic module according to claim 7, characterized in that, The battery cell group includes a first battery cell and a second battery cell, and the first battery cell and the second battery cell are connected in parallel. The first battery unit includes a first battery string and a second battery string arranged in parallel, and the first battery string and the second battery string are connected in series. The second battery unit includes a third battery string and a fourth battery string arranged in parallel, and the third battery string and the fourth battery string are connected in series. The first, second, third, and fourth battery strings each include multiple battery cells connected in series. Multiple solder strips are electrically connected to the multiple battery cells in the first, second, third, and fourth battery strings. The multiple solder strips extend along the string arrangement direction of the multiple battery cells and are parallel to each other.

10. The photovoltaic module according to claim 9, characterized in that, For the first battery cell group connected in series along the first direction in the battery layer: the first battery string and the third battery string are electrically connected to the first busbar via the solder strip, and the second battery string and the fourth battery string are electrically connected to the second busbar adjacent to the first busbar via the solder strip; and / or, For the last battery cell group connected in series along the first direction in the battery layer: the first battery string and the third battery string are electrically connected to the second busbar adjacent to the third busbar via the solder strip, and the second battery string and the fourth battery string are electrically connected to the third busbar via the solder strip; and / or, For the battery cell group between the first and last battery cell groups connected in series along the first direction: the first battery string and the third battery string are electrically connected to the second busbar via the solder strip, and the second battery string and the fourth battery string are both electrically connected to the adjacent second busbar via the solder strip.

11. The photovoltaic module according to claim 9, characterized in that, The busbar also includes a fourth busbar and a fifth busbar; The first and second battery strings within the same first battery cell are connected in series with the fourth busbar via the solder strip, and the third and fourth battery strings within the same second battery cell are connected in series with the fifth busbar via the solder strip.

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