A photovoltaic module

Abstract

The utility model discloses a photovoltaic module, include: first battery string array, first battery string array has first end, second battery string array, second battery string array has second end, first welding extension section has first welding end, first connecting end, and first welding end is located first end, and first connecting end is located the back of first battery string array, second welding extension section has second welding end, second connecting end, and second welding end is located second end, and second connecting end is located the back of second battery string array, a plurality of first bus bar, and every first bus bar is located first connecting end, a plurality of second bus bar, and every second bus bar is located second connecting end. And first bus bar, second bus bar are connected through wiring assembly, realize circuit's series / parallel connection intercommunication. The utility model can solve the problem of low conversion efficiency of module caused by the fact that the bus bar between the adjacent battery string array cannot be hidden in the prior art.

Description

Technical Field

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

[0002] Solar photovoltaic (PV) modules are the core power generation units of a photovoltaic (PV) power generation system, converting solar energy into electrical energy based on the photovoltaic effect. To increase the output current, solar PV modules typically employ a "series-then-parallel" electrical structure. This means that PV cells are first connected in series to form a cell string, multiple cell strings form a cell string array, and then multiple cell string arrays are connected together via busbars to form a solar PV module.

[0003] However, if the busbars, as parallel conductors, are placed on the front side of the cell string array (i.e., the light-receiving side), it reduces the cell density, thereby lowering the module's conversion efficiency and thus reducing the power generation per unit area. Furthermore, the exposed metal strips disrupt the visual uniformity and aesthetics of the module. To circumvent this problem, existing technologies typically conceal busbars located at the module's edges to the back of the cell string array using flexible solder strips. However, for busbars in the middle region between cell string arrays, the solder strips in this area are structurally impeded by being welded between adjacent cell string arrays, hindering bending operations. This results in insufficient bending space and an inability to directly weld the busbars to the back of the solder strips, thus lacking an effective concealment method. These busbars must remain continuously exposed on the module's front side, becoming a bottleneck restricting further improvements in module efficiency.

[0004] Therefore, there is an urgent need for a photovoltaic module that can hide all busbars. Utility Model Content

[0005] The purpose of this invention is to solve the problem of low component conversion efficiency caused by the inability to hide the busbars located between adjacent battery string arrays in the prior art.

[0006] To address the aforementioned technical problems, this utility model discloses a photovoltaic module, comprising:

[0007] The first battery string array has a first end along its width direction;

[0008] The second battery string array has a second end along the width direction; the first battery string array and the second battery string array are arranged side by side along the width direction, and a gap is provided between the first end and the second end;

[0009] The first welding extension section has a first welding end and a first connecting end. The first welding end is disposed at the first end, and the first connecting end is located on the back side of the first battery string array. Along the height direction, the first connecting end and the back side of the first battery string array are spaced apart.

[0010] The second welding extension section has a second welding end and a second connecting end. The second welding end is located at the second end, and the second connecting end is located on the back side of the second battery string array. Along the height direction, the second connecting end and the back side of the second battery string array are spaced apart. Along the width direction, the first welding extension section and the second welding extension section are spaced apart.

[0011] Multiple first busbars are spaced apart along the length direction, and each first busbar is located at the first connection end;

[0012] Multiple second busbars are spaced apart along the length direction, with each second busbar located at the second connection end; along the width direction, the first busbar and the second busbar are spaced apart.

[0013] Multiple wiring assemblies are spaced apart along the length direction; each wiring assembly includes two wiring plates and a diode. The two wiring plates are spaced apart along the length direction, and the diode is disposed between the two wiring plates and electrically connected to the two wiring plates.

[0014] Each of the first busbars corresponds one-to-one with a plurality of the second busbars;

[0015] Two adjacent first busbars are connected by two terminal blocks in one wiring assembly, and two adjacent second busbars are connected by two terminal blocks in one wiring assembly. Corresponding first busbars and second busbars are connected by the same terminal block.

[0016] By adopting the above technical solution, a first welding extension section and a second welding extension section are respectively set on the front side of the first and second battery string arrays, and a first busbar and a second busbar are correspondingly set on the first and second welding extension sections. Since there is a gap between the first and second battery string arrays, operational space is provided for bending the first and second welding extension sections, allowing the first and second busbars to bend and be arranged on the back side of the corresponding battery string arrays. This achieves the concealment of the busbars located in the middle area of ​​the battery string arrays towards the back side, increasing the cell arrangement density, thereby effectively reducing optical loss per unit area and improving the overall conversion efficiency of the photovoltaic module.

[0017] In addition, the first welding extension section and the second welding extension section are spaced apart to effectively avoid the risk of short circuit caused by contact between the two.

[0018] The structure of multiple first busbars and multiple second busbars increases the heat dissipation area of ​​the busbars, reduces the operating temperature of the busbars, and improves the reliability of the components.

[0019] Furthermore, by setting a wiring assembly containing diodes and two terminal blocks between the first and second battery string arrays, and establishing the connection relationship between the first and second busbars, electrical connections are achieved between adjacent first and second busbars, as well as between corresponding first and second busbars. This ensures the collection and transmission of current in multiple parallel paths and also allows for the formation of bypass channels through diodes when a local battery string array experiences shading or failure, effectively preventing hot spot effects.

[0020] According to another specific embodiment of the present invention, a photovoltaic module is disclosed, which further includes:

[0021] A first insulating element is disposed between the first connecting end and the back of the first battery string array, and is connected to the first battery string array;

[0022] The second insulating element is disposed between the second connecting end and the back of the second battery string array, and is connected to the second battery string array.

[0023] By adopting the above technical solution, a first insulating component and a second insulating component are respectively provided between the first welding extension section, the second welding extension section and the back of the corresponding battery string array. The first insulating component and the second insulating component are both made of insulating materials, such as EPE (EVA-PET-EVA), which is a composite material of ethylene vinyl acetate copolymer-polyterephthalic acid-ethylene vinyl acetate copolymer. Other composite materials can also be used to achieve electrical isolation and prevent short circuits.

[0024] The first and second insulating components achieve electrical isolation between the first and second busbars and the back of the corresponding battery string array, preventing short circuit risks caused by contact between the first and second welding extension sections or the first and second busbars and the back of the corresponding battery string array, thus improving the electrical safety and operational reliability of the components.

[0025] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a photovoltaic module, wherein along the width direction, the first battery string array has a third end and the second battery string array has a fourth end;

[0026] The photovoltaic module also includes:

[0027] Multiple third busbars are disposed on the back of the first battery string array and the second battery string array. The third busbar located on the back of the first battery string array is connected to the third end; the third busbar located on the back of the second battery string array is connected to the fourth end.

[0028] Along the height direction, the cross-sectional area of ​​the first busbar is a, the cross-sectional area of ​​the second busbar is b, and the cross-sectional area of ​​the third busbar is c, where c > a ≥ 0.5 * c and c > b ≥ 0.5 * c.

[0029] By employing the above technical solution, a third busbar is positioned at the edges of the first and second battery string arrays, and the cross-sectional area ratio of the first, second, and third busbars is configured. Since the cross-sectional area of ​​the busbar is proportional to its current carrying capacity, the combined current-carrying capacity of the first and second busbars in the middle region matches that of the third busbar at the edge. This ensures current output capability while avoiding current transmission limitations due to excessively small cross-sectional areas of the middle busbars, and also preventing material waste caused by excessively large cross-sectional areas, thus achieving an optimized balance between electrical performance and cost-effectiveness.

[0030] According to another specific embodiment of the present invention, a photovoltaic module is disclosed, wherein the front side of the first battery string array is coplanar with the front side of the second battery string array.

[0031] By adopting the above technical solution, the flatness and continuity of the light-receiving surface (i.e., the front side) of the photovoltaic module are ensured by keeping the front side of the first battery string array and the front side of the second battery string array coplanar. This effectively avoids optical loss and local shadows caused by inconsistent surface height of the battery string array, thereby optimizing the light absorption efficiency and improving the overall output performance and reliability of the photovoltaic module.

[0032] According to another specific embodiment of the present invention, a photovoltaic module is disclosed, which further includes:

[0033] An isolation pad is disposed in the gap between the first welding extension section and the second welding extension section along the width direction, and is connected to the battery string array of the first welding extension section and the battery string array of the second welding extension section.

[0034] According to another specific embodiment of the present invention, a photovoltaic module is disclosed. Along the height direction, the insulating pad has an extension portion and an abutment portion. The extension portion is disposed in the gap between the first welding extension section and the second welding extension section, and the abutment portion abuts against the front of the first battery string array and the second battery string array, respectively.

[0035] Using the above technical solution, the extension is made of insulating material, such as polyolefin, polyamide, or fluoroplastic. The extension is located between the first welded extension section and the second welded extension section, achieving direct physical isolation between the two and effectively preventing the risk of short circuits caused by insufficient spacing.

[0036] The abutting parts abut against the front surfaces of the first and second battery string arrays, respectively. This not only provides stable positioning support for the battery string arrays, but also facilitates precise adjustment and maintenance of the coplanarity of the front surfaces of each battery string array during assembly, thereby ensuring the flatness of the light-receiving surface and the consistency of optical performance of the component.

[0037] According to another specific embodiment of the present invention, a photovoltaic module is disclosed, wherein each of the terminal blocks is provided with a first through hole and a second through hole, the first through hole and the second through hole both penetrating the terminal block along the height direction; the first through hole and the second through hole are spaced apart along the width direction;

[0038] One end of the first busbar extends to the first through hole, and one end of the corresponding second busbar extends to the second through hole.

[0039] By adopting the above technical solution, the first and second through holes are set at intervals to achieve precise positioning between the corresponding first and second busbars, avoiding offset and skewing in subsequent assembly processes, thereby improving production yield.

[0040] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a photovoltaic module, wherein each of the terminal blocks is provided with a third through hole, and the third through hole penetrates the terminal block along the height direction;

[0041] One end of the first busbar and one end of the corresponding second busbar both extend to the same third through hole.

[0042] By adopting the above technical solution, a third through hole, which is larger than the first and second through holes, is set so that the third through hole can simultaneously accommodate the passage of the first and second busbars, thereby improving the assembly efficiency of the photovoltaic module and facilitating installation. Attached Figure Description

[0043] Figure 1 A perspective view of a solar photovoltaic module according to some embodiments is shown;

[0044] Figure 2 A schematic diagram of the front of a solar photovoltaic module is shown in some embodiments;

[0045] Figure 3 Circuit diagrams of some embodiments of solar photovoltaic modules are shown;

[0046] Figure 4 A perspective view of a photovoltaic module according to an embodiment of the present invention is shown;

[0047] Figure 5 A left view of a photovoltaic module according to an embodiment of the present invention is shown;

[0048] Figure 6 Show Figure 5 Enlarged view of section A in the middle;

[0049] Figure 7 Show Figure 5 Enlarged view of section B in the middle;

[0050] Figure 8 This shows a cross-sectional view of the busbar according to an embodiment of the present invention;

[0051] Figure 9 A perspective view of a photovoltaic module with an insulating pad according to an embodiment of the present invention is shown;

[0052] Figure 10A Show Figure 9 The left view;

[0053] Figure 10B Show Figure 10A Deformation diagram Figure 1 ;

[0054] Figure 10C Show Figure 10A Deformation diagram Figure 2 ;

[0055] Figure 10D Show Figure 10A Deformation diagram Figure 3 ;

[0056] Figure 11 A schematic diagram showing the front of the photovoltaic module before it is assembled, according to an embodiment of the present invention;

[0057] Figure 12 A schematic diagram of the back of a photovoltaic module according to an embodiment of the present invention is shown;

[0058] Figure 13 A circuit diagram of a half-cell photovoltaic module according to an embodiment of the present invention is shown;

[0059] Figure 14 The diagram shows a circuit diagram of a four-segment photovoltaic module according to an embodiment of the present invention.

[0060] Figure Labels

[0061] 100 solar photovoltaic modules;

[0062] Upper battery string array 110; Upper battery string 111;

[0063] Lower battery string array 120; Lower battery string 121;

[0064] 130mm welding strip;

[0065] Wide busbar 140;

[0066] Connector 150;

[0067] 200 photovoltaic modules;

[0068] First battery string array 210; First terminal 211; Third terminal 212;

[0069] Second battery string array 220; Second terminal 221; Fourth terminal 222;

[0070] First welding extension 231; First welding end 2311; First connecting end 2312; Second welding extension 232; Second welding end 2321; Second connecting end 2322; Third welding extension 233; Fourth welding extension 234;

[0071] First busbar 241; Second busbar 242; Third busbar 243;

[0072] First insulating component 251; Second insulating component 252;

[0073] 260; 261; 262;

[0074] Wiring assembly 270; terminal block 271; first through hole 2711; second through hole 2712; third through hole 2713; diode 272. Detailed Implementation

[0075] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0076] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0077] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model 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 the utility model.

[0078] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0079] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0080] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0081] refer to Figure 1 , Figure 2 , Figure 3 In some embodiments, a solar photovoltaic module 100 is provided, including: an upper battery string array 110, a lower battery string array 120, multiple solder strips 130, multiple wide busbars 140, and multiple connectors 150. The upper battery string array 110 includes multiple first upper battery strings 111, and the lower battery string array 120 includes multiple first lower battery strings 121. The upper battery string array 110 and the lower battery string array 120 are connected by welding to the wide busbars 140, so that the upper battery string array 110 and the lower battery string array 120 are connected in parallel. The multiple wide busbars 140 are welded to the front side of the solder strips 130. Two adjacent wide busbars 140 are connected by connectors 150 to realize the parallel connection between corresponding battery strings in the upper battery string array 110 and the lower battery string array 120.

[0082] refer to Figure 1 , Figure 2 , Figure 3 In some embodiments, solder strips 130 are respectively provided on the edge regions of the upper battery string array 110 and the lower battery string array 120, and correspondingly, a wide bus bar 140 is welded on the front side of the solder strips 130. The solder strips 130 provided on the edge regions can be bent so that the corresponding wide bus bar 140 is located on the back side of the upper battery string array 110 and the lower battery string array 120.

[0083] However, the solar photovoltaic module 100 is only applicable to the edge area, where the wide busbar 140 is hidden behind the corresponding cell string array. For the wide busbar 140 in the middle area between the cell string arrays, it is simultaneously pulled and fixed by the upper and lower welding strips 130. Due to its structural limitations, there is no effective hiding solution, which means that this part of the wide busbar 140 has to be exposed on the front, thereby reducing the power generation per unit area of ​​the solar photovoltaic module 100.

[0084] refer to Figure 4 , Figure 6 , Figure 9 To solve the above-mentioned technical problems, this application provides a photovoltaic module 200, including: a first battery string array 210, a second battery string array 220, a first welding extension section 231, a second welding extension section 232, a third extension section, a fourth extension section, a first busbar 241, a second busbar 242, a third busbar 243, a first insulating component 251, a second insulating component 252, an insulating pad 260, and a wiring assembly 270.

[0085] refer to Figure 4 In this embodiment, the first battery string array 210 is along the width direction ( Figure 4 The first battery string array 210 has a first end 211 along the Y direction; the second battery string array 220 has a second end 221 along the width direction; the first battery string array 210 and the second battery string array 220 are arranged side by side along the width direction, and a gap is provided between the first end 211 and the second end 221. Both the first battery string array 210 and the second battery string array 220 are composed of multiple battery strings.

[0086] refer to Figure 4 In this embodiment, along the height direction ( Figure 4 In the Z-direction, the front and back sides of the first battery string array 210 are arranged opposite each other, and the front and back sides of the second battery string array 220 are arranged opposite each other, with the front sides of the first battery string array 210 and the second battery string array 220 being coplanar.

[0087] By keeping the front side of the first battery string array 210 and the front side of the second battery string array 220 coplanar, the flatness and continuity of the light-receiving surface (i.e., the front side) of the photovoltaic module 200 are ensured, effectively avoiding optical loss and local shadows caused by inconsistent surface height of the battery string array, thereby optimizing the light absorption efficiency and improving the overall output performance and reliability of the photovoltaic module 200.

[0088] refer to Figure 4 , Figure 5 , Figure 6 In this embodiment, the first welding extension 231 is along the length direction ( Figure 4 Extending along the X-direction, the second welding extension 232 has a first welding end 2311 and a first connecting end 2312. The first welding end 2311 is located at the first end 211 and is situated on the front side of the first battery string array 210. The first connecting end 2312 is located on the back side of the first battery string array 210. Along the height direction, the first connecting end 2312 and the back side of the first battery string array 210 are spaced apart. Extending along the length direction, the second welding extension 232 has a second welding end 2321 and a second connecting end 2322. The second welding end 2321 is located at the second end 221 and is situated on the front side of the second battery string array 220. The second connecting end 2322 is located on the back side of the second battery string array 220. Along the height direction, the second connecting end 2322 and the back side of the second battery string array 220 are spaced apart.

[0089] In some possible implementations, the first welding end 2311 may also be located on the back side of the first battery string array 210, and the second welding end 2321 may also be located on the back side of the second battery string array 220. The choice can be made according to actual needs, and the implementation of this application does not limit this.

[0090] refer to Figure 4 , Figure 5 , Figure 6 In this embodiment, the first welding extension 231 and the second welding extension 232 are spaced apart along the width direction, thereby effectively avoiding the risk of short circuit caused by contact between the two.

[0091] refer to Figure 4 , Figure 5 , Figure 6In this embodiment, four first busbars 241 are spaced apart along the length direction. Each first busbar 241 is located at the first connection end 2312 and on the side of the first welding extension section 231 away from the back side of the first battery string array 210. Four second busbars 242 are spaced apart along the length direction. Each second busbar 242 is located at the second connection end 2322 and on the side of the second welding extension section 232 away from the back side of the second battery string array 220. Along the width direction, the first busbars 241 and the second busbars 242 are spaced apart.

[0092] In some possible implementations, the number of the first busbar 241 and the second busbar 242 may include, but is not limited to, four, or may be one, two, six, etc., as long as they can collect the current of the battery string array. The implementation of this application does not limit this.

[0093] In some possible implementations, the first busbar 241 may also be located on the side of the first welding extension 231 near the back of the first battery string array 210 and in contact with the first insulating member 251 described below. The second busbar 242 may also be located on the side of the second welding extension 232 near the back of the second battery string array 220 and in contact with the second insulating member 252 described below. This application does not limit the implementation of this embodiment.

[0094] The structure of multiple first busbars 241 and multiple second busbars 242 increases the heat dissipation area of ​​the busbars, reduces the operating temperature of the busbars, and improves the reliability of the components.

[0095] refer to Figure 4 , Figure 5 In this embodiment, the two first busbars 241 and the two second busbars 242 in the middle are U-shaped, and the two first busbars 241 and the two second busbars 242 on both sides are L-shaped.

[0096] In some possible implementations, the first busbar 241 and the second busbar 242 can also be arc-shaped, C-shaped, etc., and can be selected according to actual needs. They can be respectively set in the first welding extension section 231 and the second welding extension section 232 and connected to the wiring assembly 270.

[0097] By providing a first welding extension section 231 and a second welding extension section 232 on the front sides of the first battery string array 210 and the second battery string array 220 respectively, and by providing a first busbar 241 and a second busbar 242 corresponding to the first welding extension section 231 and the second welding extension section 232, and by providing a gap between the first battery string array 210 and the second battery string array 220, operational space is provided for bending the first welding extension section 231 and the second welding extension section 232, enabling the first busbar 241 and the second busbar 242 to be bent and arranged on the back side of the corresponding battery string array. This achieves the concealment of the busbars located in the middle area of ​​the battery string array towards the back side, increases the cell arrangement density, effectively reduces optical loss per unit area, and improves the overall conversion efficiency of the photovoltaic module 200.

[0098] refer to Figure 4 In this embodiment, three wiring assemblies 270 are spaced apart along the length direction; each wiring assembly 270 includes two wiring boards 271 and a diode 272. The two wiring boards 271 are spaced apart along the length direction, and the diode 272 is located between the two wiring boards 271 and is electrically connected to the two wiring boards 271.

[0099] By setting a wiring assembly 270 containing diodes 272 and two terminal blocks 271 between the first battery string array 210 and the second battery string array 220, and establishing the connection relationship between the first busbar 241 and the second busbar 242, electrical connections are achieved between adjacent first busbars 241 and adjacent second busbars 242, as well as between corresponding first busbars 241 and second busbars 242. This ensures the collection and transmission of current in multiple parallel paths and also allows for the formation of bypass channels through diodes 272 when a local battery string array experiences shading or a fault, effectively preventing hot spot effects.

[0100] refer to Figure 4 and combined Figure 9 In this embodiment, each terminal block 271 is provided with a first through hole 2711 and a second through hole 2712. Figure 9 As can be seen in the image, the first through hole 2711 and the second through hole 2712 both penetrate the wiring board 271 along the height direction; along the width direction, the first through hole 2711 and the second through hole 2712 are spaced apart to achieve precise positioning between the corresponding first busbar 241 and the second busbar 242, avoiding offset or skewing in subsequent assembly processes, thereby improving production yield.

[0101] refer to Figure 9In this embodiment, four first busbars 241 correspond one-to-one with four second busbars 242. Along the length direction, two adjacent first busbars 241 are connected by two terminal blocks 271 in a wiring assembly 270, with one end of each first busbar 241 extending to a first through hole 2711. Two adjacent second busbars 242 are connected by two terminal blocks 271 in a wiring assembly 270, with one end of each corresponding second busbar 242 extending to a second through hole 2712. Corresponding first busbars 241 and second busbars 242 are connected by the same terminal block 271.

[0102] In some possible implementations, each terminal block 271 has only one third through hole 2713, and the third through holes 2713 all penetrate the terminal block 271 along the height direction. One end of the first busbar 241 and one end of the corresponding second busbar 242 both extend to the same third through hole 2713.

[0103] By setting a third through hole 2713 that is larger than the first through hole 2711 and the second through hole 2712, the third through hole 2713 can simultaneously accommodate the passage of the first busbar 241 and the second busbar 242, thereby improving the assembly efficiency of the photovoltaic module 200 and facilitating installation.

[0104] refer to Figure 4 , Figure 5 , Figure 6 In this embodiment, the first insulating member 251 extends along the length direction and is disposed between the first connecting end 2312 and the back surface of the first battery string array 210, and is welded to the first battery string array 210; the second insulating member 252 extends along the length direction and is disposed between the second connecting end 2322 and the back surface of the second battery string array 220, and is welded to the second battery string array 220. Both the first insulating member 251 and the second insulating member 252 are elongated strip structures.

[0105] In some possible implementations, the connection methods between the first insulating member 251 and the first battery string array 210, and between the second insulating member 252 and the second battery string array 220, include but are not limited to welding. They can be bonding, abutting, snapping, etc., as long as they can fill the gap between the back of the first welding extension 231 and the back of the first battery string array 210, and between the back of the second welding extension 232 and the back of the second battery string array 220. The embodiments of this application do not limit this.

[0106] In some possible implementations, the shapes of the first insulating member 251 and the second insulating member 252 include, but are not limited to, elongated shapes, and can be cuboids, cylinders, trapezoids, etc., as long as they can isolate the first welding extension section 231 from the first battery string array 210 and the second welding extension section 232 from the second battery string array 220.

[0107] A first insulating member 251 and a second insulating member 252 are respectively provided between the first welding extension section 231, the second welding extension section 232 and the back of the corresponding battery string array. The first insulating member 251 and the second insulating member 252 are both made of insulating materials, such as EPE (EVA-PET-EVA), which is a composite material composed of ethylene vinyl acetate copolymer and polyterephthalic acid-ethylene vinyl acetate copolymer. Other composite materials can also be used to achieve electrical isolation and prevent short circuits.

[0108] The first insulating component 251 and the second insulating component 252 achieve electrical isolation between the first busbar 241, the second busbar 242 and the back of the corresponding battery string array, preventing short circuit risks caused by the first welding extension section 231, the second welding extension section 232 or the first busbar 241, the second busbar 242 and the back of the corresponding battery string array, thereby improving the electrical safety and operational reliability of the component.

[0109] refer to Figure 4 , Figure 5 , Figure 7 In this embodiment, along the width direction, the first battery string array 210 has a third end 212, and the second battery string array 220 has a fourth end 222. A third welding extension section 233 is disposed at the third end 212, and a fourth welding extension section 234 is disposed at the fourth end 222. One end of the third welding extension section 233 is disposed at the third end 212 and is located on the front side of the first battery string array 210, while the other end of the third welding extension section 233 is located on the back side of the first battery string array 210; one end of the fourth welding extension section 234 is disposed at the fourth end 222 and is located on the front side of the second battery string array 220, while the other end of the fourth welding extension section 234 is located on the back side of the second battery string array 220.

[0110] refer to Figure 4 , Figure 5 , Figure 7 In this embodiment, the six third busbars 243 are arranged symmetrically, using only Figure 7 The structure of the fourth end 222 is shown in the diagram. The structure of the third end 212 is the same as that of the fourth end 222, and is not shown in this embodiment. Among them, three third busbars 243 are disposed on the third welding extension section 233, three third busbars 243 are disposed on the fourth welding extension section 234, and six third busbars 243 are located on the back side of the first battery string array 210 and the second battery string array 220 respectively.

[0111] In some possible implementations, the number of third busbars 243 may include, but is not limited to, 6, but may be 2, 4, 8 or more, and the implementation of this application does not limit this.

[0112] refer to Figure 8 , Figure 8 The image shows a side view of the first busbar 241, the second busbar 242, and the third busbar 243. In this embodiment, viewed from the side, the first busbar 241 has a length of L1 and a height of H1, with a cross-sectional area a = L1 * H1. The second busbar 242 has a length of L2 and a height of H2, with a cross-sectional area b = L2 * H2. The third busbar 243 has a length of L3 and a height of H3, with a cross-sectional area c = L3 * H3, where a = 0.5 * c and b = 0.5 * c.

[0113] In some possible implementations, a and b are not limited to 0.5*c, and can be 0.6c, 0.7c, 0.8c, etc., as long as c > a ≥ 0.5*c and c > b ≥ 0.5*c. By setting a third busbar 243 at the edges of the first battery string array 210 and the second battery string array 220, and configuring the cross-sectional area ratio of the first busbar 241, the second busbar 242, and the third busbar 243, since the cross-sectional area of ​​the busbar is proportional to its current carrying capacity, the total current carrying capacity of the first busbar 241 and the second busbar 242 in the middle region matches that of the third busbar 243 at the edges. While ensuring current output capability, this avoids limiting current transmission due to an excessively small cross-sectional area of ​​the middle busbar, and also prevents material waste due to an excessively large cross-sectional area, achieving an optimized balance between electrical performance and cost-effectiveness.

[0114] In other possible implementations, the cross-sectional area a of the first busbar 241 may be less than 0.5*c or greater than c; the cross-sectional area b of the second busbar 242 may also be less than 0.5*c or greater than c, as long as the current carrying capacity of the battery string array can be guaranteed. All of these can be selected according to actual needs, and the implementation of this application does not limit them.

[0115] refer to Figure 9 In this embodiment, along the width direction, the isolation pad 260 is disposed in the gap between the first welding extension 231 and the second welding extension 232, and is connected to the first welding extension 231 and the second welding extension 232.

[0116] refer to Figure 9 , Figure 10A In this embodiment, along the height direction, the isolation pad 260 is a T-shaped strip structure. The isolation pad 260 has an extension 261 and an abutment 262. The extension 261 is disposed in the gap between the first welding extension section 231 and the second welding extension section 232. The abutment 262 abuts against the front of the first battery string array 210 and the second battery string array 220 respectively.

[0117] The extension 261 is made of an insulating material, such as polyolefin, polyamide, or fluoroplastic. The extension 261 is disposed between the first welded extension section 231 and the second welded extension section 232 to achieve direct physical isolation between the two and effectively prevent the risk of short circuit caused by insufficient spacing.

[0118] The contact portion 262 maintains contact with the front surfaces of the first battery string array 210 and the second battery string array 220, which not only provides stable positioning support for the battery string arrays, but also facilitates precise adjustment and maintenance of the coplanarity of the front surfaces of each battery string array during assembly, thereby ensuring the flatness of the light-receiving surface of the component and the consistency of optical performance.

[0119] In some possible implementations, the shape of the isolation pad 260 includes, but is not limited to, a T-shape, for example, Figure 10B The H-shaped shape shown Figure 10C The C-type shown Figure 10D The Z-shaped configuration shown can isolate the first welding extension section 231 from the second welding extension section 232 and can abut against the front of the two battery string arrays. This application does not limit this aspect.

[0120] For example, the extension 261 and the abutment 262 are integrally formed, which improves the overall structural integrity and connection reliability, while simplifying the process and reducing manufacturing costs. In some possible embodiments, the extension 261 and the abutment 262 may also be separate structures, which is not limited in this application.

[0121] In some possible implementations, the isolation pad 260 may not be provided, as long as the gap between the first welding extension 231 and the second welding extension 232 is maintained.

[0122] The manufacturing process of the photovoltaic module 200 is as follows:

[0123] Step S1: Provide a first battery string array 210, a second battery string array 220, a first welding extension section 231, a second welding extension section 232, a first busbar 241, and a second busbar 242. The first busbar 241 is disposed on the first battery string array 210 through the first welding extension section 231, and the second busbar 242 is disposed on the second battery string array 220 through the second welding extension section 232.

[0124] Step S2: Reference Figure 11The first welding extension 231, together with the first busbar 241, is bent toward the back of the first battery string array 210 so that the first busbar 241 is located on the back of the first battery string array 210; at the same time, the second welding extension 232, together with the second busbar 242, is bent toward the back of the second battery string array 220 so that the second busbar 242 is located on the back of the second battery string array 220.

[0125] Step S3: Reference Figure 12 The first battery string array 210 and the second battery string array 220 are moved along the width direction to reduce the gap between them to a preset distance.

[0126] Step S4: Install multiple wiring assemblies 270 to electrically connect the first busbar 241 to the corresponding second busbar 242 via the wiring assemblies 270. (Reference) Figure 13 , Figure 13 This is a circuit diagram of a half-cell photovoltaic module 200, specifically the circuit diagram corresponding to this embodiment. (Reference) Figure 14 In some possible implementations, the photovoltaic module 200 can also be applied to a four-cell photovoltaic module 200, but the implementation of this application does not limit this.

[0127] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A photovoltaic module, characterized in that, include: The first battery string array (210) has a first end (211) along the width direction. The second battery string array (220) has a second end (221) along the width direction; the first battery string array (210) and the second battery string array (220) are arranged side by side along the width direction, and a gap is provided between the first end (211) and the second end (221); The first welding extension section (231) has a first welding end (2311) and a first connecting end (2312). The first welding end (2311) is located at the first end (211), and the first connecting end (2312) is located on the back side of the first battery string array (210). Along the height direction, the first connecting end (2312) is spaced apart from the back side of the first battery string array (210). The second welding extension section (232) has a second welding end (2321) and a second connecting end (2322). The second welding end (2321) is located at the second end (221), and the second connecting end (2322) is located on the back side of the second battery string array (220). Along the height direction, the second connecting end (2322) and the back side of the second battery string array (220) are spaced apart. Along the width direction, the first welding extension section (231) and the second welding extension section (232) are spaced apart. Multiple first busbars (241) are spaced apart along the length direction, and each first busbar (241) is located at the first connection end (2312). Multiple second busbars (242) are spaced apart along the length direction, and each second busbar (242) is located at the second connection end (2322); along the width direction, the first busbar (241) and the second busbar (242) are spaced apart; Multiple wiring assemblies (270) are spaced apart along the length direction; each wiring assembly (270) includes two wiring boards (271) and a diode (272). Along the length direction, the two wiring boards (271) are spaced apart, and the diode (272) is located between the two wiring boards (271) and electrically connected to the two wiring boards (271). Each of the first busbars (241) corresponds one-to-one with a plurality of the second busbars (242); Two adjacent first busbars (241) are connected by two terminal blocks (271) in a wiring assembly (270), and two adjacent second busbars (242) are connected by two terminal blocks (271) in a wiring assembly (270). Corresponding first busbars (241) and second busbars (242) are connected by the same terminal block (271).

2. The photovoltaic module as described in claim 1, characterized in that, Also includes: The first insulating element (251) is disposed between the first connecting end (2312) and the back of the first battery string array (210) and is connected to the first battery string array (210); The second insulating member (252) is disposed between the second connecting end (2322) and the back of the second battery string array (220) and is connected to the second battery string array (220).

3. The photovoltaic module as described in claim 1, characterized in that, Along the width direction, the first battery string array (210) has a third end (212), and the second battery string array (220) has a fourth end (222). The photovoltaic module also includes: Multiple third busbars (243) are disposed on the back of the first battery string array (210) and the second battery string array (220). The third busbar (243) on the back of the first battery string array (210) is connected to the third end (212); the third busbar (243) on the back of the second battery string array (220) is connected to the fourth end (222). Along the height direction, the cross-sectional area of ​​the first busbar (241) is a, the cross-sectional area of ​​the second busbar (242) is b, and the cross-sectional area of ​​the third busbar (243) is c, where c > a ≥ 0.5 * c and c > b ≥ 0.5 * c.

4. The photovoltaic module as described in claim 1, characterized in that, The front side of the first battery string array (210) is coplanar with the front side of the second battery string array (220).

5. The photovoltaic module as described in claim 1, characterized in that, Also includes: The isolation pad (260) is disposed in the gap between the first welding extension section (231) and the second welding extension section (232) along the width direction, and is connected to the battery string array of the first welding extension section (231) and the battery string array of the second welding extension section (232).

6. The photovoltaic module as described in claim 5, characterized in that, Along the height direction, the insulating pad (260) has an extension (261) and an abutment (262). The extension (261) is disposed in the gap between the first welding extension (231) and the second welding extension (232). The abutment (262) abuts against the front of the first battery string array (210) and the second battery string array (220), respectively.

7. The photovoltaic module as described in claim 1, characterized in that, Each of the terminal blocks (271) is provided with a first through hole (2711) and a second through hole (2712), and the first through hole (2711) and the second through hole (2712) both penetrate the terminal block (271) along the height direction; along the width direction, the first through hole (2711) and the second through hole (2712) are spaced apart; One end of the first busbar (241) extends to the first through hole (2711), and one end of the corresponding second busbar (242) extends to the second through hole (2712).

8. The photovoltaic module as described in claim 1, characterized in that, Each of the terminal blocks (271) is provided with a third through hole (2713), and the third through hole (2713) penetrates the terminal block (271) along the height direction. One end of the first busbar (241) and one end of the corresponding second busbar (242) both extend to the same third through hole (2713).

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