Photovoltaikmodul

Abstract

Photovoltaic module, comprehensive: Cell strands (1), each cell strand comprising multi-segmented cells (11) connected in series; two ends of one of the cell strands (1) are provided with a busbar (2) to connect the cell strands (1); the busbar (2) comprising a first busbar (21), a second busbar (22), and a third busbar (23); along a first direction, the first busbar (21), the second busbar (22), and the third busbar (23) are spaced apart from each other, one end of the first busbar (21) opposite the second busbar (22) being a first connection end, and one end of the second busbar (22) opposite the third busbar (23) being a second connection end; and a switching wire (3) which is connected to the busbar (2) and extends along a second direction perpendicular to the first direction; wherein the switching wire (3) comprises a first switching wire (31) and a second switching wire (32), wherein the first switching wire (31) is arranged between the first busbar (21) and the second busbar (22) and overlaps the second busbar (22), wherein the second switching wire (32) is arranged between the second busbar (22) and the third busbar (23); a second bending section (221) is provided at one end of the second busbar (22) adjacent to the second switching wire (32), and a third bending section (231) is provided at one end of the third busbar (23) adjacent to the second switching wire (32); and the second connecting wire (32) includes a fourth bending section (321), and the second bending section (221), the third bending section (231) and the fourth bending section (321) are all bent along a thickness direction of the photovoltaic module to form the second connection end.

Description

TECHNICAL AREA

[0001] The present disclosure relates to the field of photovoltaic technology, in particular a photovoltaic module. TECHNICAL BACKGROUND

[0002] In photovoltaic modules, the photovoltaic effect of the cells converts light energy into electrical energy. The electrical energy generated by the cells is collected and exported via busbars by connecting several cells in series. In the current state of the art, the cells within a cell string are in a two-segment configuration. As the size of the cells increases, the current within a single cell string also increases, leading to a significant power loss in the photovoltaic module. SUMMARY

[0003] The present disclosure provides a photovoltaic module to solve the technical problem of high overall power loss in photovoltaic modules.

[0004] In some embodiments, the present disclosure provides a photovoltaic module. The photovoltaic module comprises: Cell strands, each of the cell strands comprising multi-segmented cells connected in series; two ends of one of the cell strands are provided with a busbar to connect the multi-segmented cells, the busbar comprising a first busbar, a second busbar and a third busbar along a first direction, the first busbar, the second busbar and the third busbar being spaced apart from each other, one end of the first busbar opposite the second busbar being a first connection end and one end of the second busbar opposite the third busbar being a second connection end; a connecting wire connected to the busbar and extending along a second direction perpendicular to the first direction; wherein the connecting wire comprises a first connecting wire overlapping the second busbar, and a first connection element is provided on a side of the connecting wire away from the second busbar, and a first bend section is provided at an end of the first busbar adjacent to the second busbar, the first connection element and the first bend section both extending along a thickness direction of the photovoltaic module to form the first connection end.

[0005] In some embodiments of the present disclosure, the first connection element comprises a first fastening section and a first connection section, wherein an angle is formed between the first fastening section and the first connection section, the first fastening section is connected to the first connecting wire, and the first connection section extends along the thickness of the photovoltaic module.

[0006] In some embodiments of the present disclosure, the width of the first fastening section is greater than or equal to the width of the first switching wire.

[0007] In some embodiments of the present disclosure, the switching wire further comprises a second switching wire which is arranged between the second busbar and the third busbar.

[0008] In some embodiments of the present disclosure, a second bending section is provided at one end of the second busbar adjacent to the second connecting wire, a third bending section is provided at one end of the third busbar adjacent to the second connecting wire, and the second connecting wire comprises a fourth bending section, wherein the second bending section, the third bending section and the fourth bending section are all bent along the thickness of the photovoltaic module to form the second connection end.

[0009] In some embodiments of the present disclosure, the second connecting wire further comprises a first straight segment and a second straight segment, wherein the first straight segment and the second straight segment both extend along the longitudinal direction of the photovoltaic module and the fourth bent section is arranged between the first straight segment and the second straight segment; wherein the fourth bent section comprises a first bent segment and a second bent segment, wherein the first bent segment and the second bent segment both extend along the thickness direction of the photovoltaic module and are connected to each other via one end of the first bent segment and one end of the second bent segment, wherein another end of the first bent segment is connected to the first straight segment and another end of the second bent segment is connected to the second straight segment.

[0010] In some embodiments of the present disclosure, the connecting wire is arranged along the thickness of the photovoltaic module on one side of the multi-segment cell; and along the width direction of the connecting wire, the distance between two adjacent segmented cells is less than the width of the connecting wire, wherein the photovoltaic module comprises an insulating element provided along the thickness direction of the photovoltaic module between the connecting wire and the multi-segment cell.

[0011] In some embodiments of the present disclosure, the width of the switching wire is between 4 mm and 8 mm; and the thickness of the switching wire is between 0.15 mm and 0.4 mm.

[0012] In some embodiments of the present disclosure, the width of the insulating element is between 8 mm and 18 mm and the thickness of the insulating element is between 0.15 mm and 0.25 mm.

[0013] In some embodiments of the present disclosure, the photovoltaic module further comprises a first connection hole and a second connection hole, wherein the first connection end is brought out of the first connection hole, the second connection end is brought out of the second connection hole, and a cross-sectional area of ​​the first connection hole is less than or equal to a cross-sectional area of ​​the second connection hole.

[0014] The present disclosure relates to a photovoltaic module comprising cell strings. Each cell string comprises multi-segment cells connected in series. Two ends of one of the cell strings are provided with a busbar for connecting multiple cell strings. The busbar comprises a first busbar, a second busbar, and a third busbar. Along a first direction, the first busbar, the second busbar, and the third busbar are spaced apart from one another. An end of the first busbar opposite the second busbar is a first connection end, and an end of the second busbar opposite the third busbar is a second connection end. The photovoltaic module further comprises a first connection wire, the first connection wire overlapping the second busbar. A first bending section is provided at one end of the first busbar adjacent to the second busbar.One end of the first connecting wire, the one furthest from the second busbar, is equipped with a first connection element. This facilitates setting a distance between the first connection element and the first bending section, thereby reducing the possibility of a short circuit due to accidental contact between the first connection element and the first bending section, and improving the safety of the photovoltaic module.

[0015] It is understood that the general description provided above and the detailed description in the following text serve only for illustration and do not limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic diagram of a circuit of a photovoltaic module provided by some embodiments of the present disclosure; Fig. Figure 2 is a structural schematic diagram of a photovoltaic module provided by some embodiments of the present disclosure; Fig. Figure 3 is a position relationship diagram of the multi-segment cells, insulating elements and switching wires provided by some embodiments of the present disclosure; Fig. 4 is a partially enlarged view of position I in Fig. 2; Fig. Figure 5 is a schematic diagram of an embodiment of a first terminal end provided by some embodiments of the present disclosure; Fig. Figure 6 is a schematic diagram of a further embodiment of the first terminal end, which is provided by some embodiments of the present disclosure; Fig. 7 is a top view of the first connection end provided by some embodiments of the present disclosure; Fig. 8 is a partially enlarged view of position II in Fig. 2; Fig. 9 is a side view of a second terminal end provided by some embodiments of the present disclosure; Fig. Figure 10 is a top view of a second connection end provided by some embodiments of the present disclosure; Fig. Figure 11 is a schematic structure diagram of an embodiment of a second switching wire provided by some embodiments of the present disclosure; Fig. Figure 12 is a schematic structure diagram of a further embodiment of a second switching wire provided by some embodiments of the present disclosure; Fig. Figure 13 is a schematic structure diagram of a further embodiment of a second switching wire provided by some embodiments of the present disclosure. Reference symbol: 1 cell strand; 11 multi-segmented cell; 2 busbar 21 first busbar; 211 first bending section; 22 second busbar 221 second bending section; 222 fifth bending section; 23 third busbar; 231 third bending section; 24 Edge busbar; 3 switching wire 31 first switching wire; 32 second switching wire; 321 fourth bending section; 321a first curved segment; 321b second curved segment; 322 first straight segment; 323 second straight segment; 324 first body section; 325 second body section; 325a third even segment; 325b third curved segment; 4 first connection element; 41 first fastening section; 42 first connecting section; 5 Insulation element 6 first connection hole; 7 second connection hole; 8 second connection element; 81 second fastening section; and 82 second connecting section.

[0016] The accompanying drawings are incorporated into the description and form part of it. They illustrate the embodiments of the present disclosure and are used together with the description to explain the principles of the present disclosure. DESCRIPTION OF THE EXECUTION FORMS

[0017] In order to better understand the technical solutions of the present disclosure, the embodiments of the present disclosure are described in detail with reference to the drawings.

[0018] It should be clear that the described embodiments represent only a portion of the embodiments of the present disclosure and do not encompass all embodiments. All other embodiments obtained by persons skilled in the art without creative effort fall within the scope of protection of the present disclosure.

[0019] The terms used in the embodiments of the present disclosure serve only to describe a particular embodiment and not to limit the present disclosure. The terms "a", "an", "the", and "the aforementioned" in the singular, in the embodiment of the present disclosure and the appended claims, are also intended to include their plural forms, unless otherwise specified.

[0020] It is understood that the term "and / or," used in connection with the present revelation, serves to describe a correlational relationship between related objects, meaning that there can be three relationships: for example, A and / or B can mean only A, both A and B, and only B. Furthermore, the symbol " / " generally indicates that the relationship between the objects before and after the " / " is an "or" relationship.

[0021] It should be noted that the directional terms described in this disclosure, such as "above," "below," "left," "right," etc., are used based on the angle shown in the accompanying drawing and should not be interpreted as limiting the present disclosure. Furthermore, it must also be understood in context that when it is mentioned that a component is "connected" "on" or "under" another component, this connection may not be directly on or under the other component, but may also be indirectly connected to the other component via an intermediate component.

[0022] As in Fig. 1 and Fig. As shown in Figure 2, the present disclosure provides a photovoltaic module. The photovoltaic module comprises several cell strings 1. Busbars 2 are provided at both ends of the cell strings 1 to connect several cell strings 1. Along the thickness direction Z of the photovoltaic module, the front side of the cell strings 1 is provided with photovoltaic glass, and an adhesive film layer is provided between the photovoltaic glass and the cell string 1. The back side of the cell string 1 is provided with a backplate or photovoltaic glass. An adhesive film layer is also located between the cell strings 1 and the backplate or the photovoltaic glass. After lamination, a laminated element is formed. A frame is provided along the perimeter of the laminated element to protect the edge of the laminated piece and to form the photovoltaic module.

[0023] The cell string 1 comprises several multi-segmented cells 11 connected in series. The types of multi-segmented cells 11 in the embodiments of the present disclosure include, but are not limited to, passivated emission electrode backside cells (PERC), tunnel oxide passivated contact (TOPCon), heterojunctions with intrinsic thin films (HJT), interdigital backside contacts (IBC), perovskite solar cells (PSC), multi-gate cells (MBB) and zero-gate cells (0BB), etc.

[0024] In PERC cells, the cell structure comprises, sequentially along its thickness direction, a front metal-silver electrode, a front silicon nitride passivation layer, a phosphor layer emitter, a P-type base silicon layer, a local aluminum backfield, a rear metal-aluminum electrode, and a rear passivation layer (Al₂O₃ / SiNₓ). PERC cells utilize a back-side passivation layer that replaces the full aluminum backfield, improves internal light reflection on the silicon substrate, reduces the back-side recombination rate, and increases cell efficiency by 0.5% to 1%.

[0025] The TOPCon cell comprises, in descending order of thickness, a metal silver electrode, a silicon nitride passivation layer on the front surface, a boron-doped emission electrode, an N-type silicon layer, a diffusion-doped layer, ultrathin silicon oxide, doped polycrystalline silicon, silicon nitride, and a metal silver electrode. The rear of the cell consists of an ultrathin silicon oxide layer (1 nm to 2 nm) and a layer of phosphorus-doped microcrystalline amorphous mixed silicon film, which together form a passive contact structure. This structure can block minority charge carrier recombination and improve the cell's open-circuit voltage and short-circuit current. The ultrathin oxide layer allows majority charge carrier electrons to tunnel into the polycrystalline silicon layer while blocking minority charge carrier recombination.The excellent passivation effect of ultrathin silicon oxide and heavily doped silicon film causes a curvature of the surface energy bands of silicon wafers, resulting in a field passivation effect. The probability of electron tunneling increases significantly, the contact resistance decreases, and the open-circuit voltage and short-circuit current of the cell are improved, thereby increasing the cell's conversion efficiency.

[0026] In the HJT cell, the HJT cell comprises, successively along its thickness, a front low-temperature silver electrode, a front conductive film, an N-type amorphous silicon film, an intrinsic amorphous silicon film, an N-type base silicon layer, an intrinsic amorphous silicon film, a P-type amorphous silicon film, a rear conductive film, and a rear low-temperature silver electrode.

[0027] IBC cells comprise, sequentially along their thickness, a silicon nitride antilayer, an N+ front surface field, an N-type base silicon layer, a P+ emitter, an N+ back surface field, an aluminum oxide passivation layer, a silicon nitride antireflection layer, and a metal silver electrode. IBC cells achieve a uniform and precisely controllable P and N regions of high quality through ion implantation technology. The front surface of the cell is not blocked by grid lines, thus avoiding the loss of shading current due to the shielding effect of the metal electrode and achieving maximum utilization of the incident photons. Compared to conventional solar cells, the short-circuit current of IBC cells can be increased by approximately 7%.Due to the back-contact structure, the problem of grid line shading does not need to be considered, and the grid line ratio can be broadened accordingly, thereby reducing the series resistance and achieving a high fill factor. Surface passivation and surface light-trapping structures can be optimally designed, resulting in a lower recombination rate and surface reflection on the front surface.

[0028] Along its thickness, the perovskite cell comprises, in succession, a substrate material, a conductive thin film, an electron transport layer (titanium dioxide), a perovskite absorption layer (hole transport layer), and a metal cathode. The perovskite material has a high light absorption coefficient and a long charge carrier diffusion distance. The photons absorbed by the perovskite material are converted into electrons, which can be easily collected by the electrode with minimal loss. Therefore, it can generate a high photovoltaic voltage and current, giving perovskite a high photoelectric conversion efficiency.

[0029] In multi-busbar cells, several busbars are provided on the cell surface, shortening the current path, reducing internal losses, and thus improving the cell's performance. As the number of busbars increases, the cross-sectional area of ​​the busbars and electrode leads decreases, and the adhesive layer becomes thinner, which can lower the production costs of the photovoltaic module. Similarly, with an increasing number of busbars, the number of fingers can be reduced, further lowering cell production costs.

[0030] In the zero-busbar cell, there is no busbar on the cell surface. After several cells are soldered together, the finger electrode leads replace the original busbar to establish a direct connection to the finger, which can reduce silver paste consumption and lower cell production costs. The zero-busbar cell can reduce the grid line shadowing area within the cell, decrease finger transmission loss, and improve the overall assembly performance. Simultaneously, increasing the contact area with the fingers reduces the risk of hidden cracks in thin silicon wafers, thus improving yield and reliability.

[0031] The multiple multi-segmented cells 11 in the cell string 1 can be soldered using spot soldering. The two adjacent multi-segmented cells 11 overlap, with the overlap area having a size of 0.2 mm to 0.6 mm. Subsequently, an electrode conductor is provided in the overlap area of ​​the two adjacent multi-segmented cells 11 to connect them and form the cell string 1. The multiple multi-segmented cells 11 in the cell string 1 are connected in series by the spot soldering process, which reduces the distance between the multiple multi-segmented cells 11 in the cell string 11, increases the area fraction of the multi-segmented cells 11 in the photovoltaic module, and thus increases the effective light absorption area in the photovoltaic module, thereby increasing the power output of the photovoltaic module.The two adjacent multi-segment cells 11 are arranged in an overlapping manner, and an electrode conductor is provided in the overlapping area. During the lamination process, the overlapping area is prone to stress concentration problems. A buffer layer can also be provided in the overlapping area of ​​the two adjacent multi-segment cells 11 to reduce the possibility of hidden cracks in the multi-segment cell 11.

[0032] The multi-segment cell 11 can be segmented into a two-segment cell, a three-segment cell, a four-segment cell, and so on. Using the four-segment cell as an example, the complete cell is divided into four equal parts to form a four-segment cell. Depending on the size of the complete cell, the length of the four-segment cell can be 182.3 mm and the width 46.675 mm to 53.25 mm. After the multiple four-segment cells are connected together in the cell string 1, the overlap width between adjacent four-segment cells can be 0.2 mm to 0.6 mm, and the distance between adjacent cell strings 1 can be 1.2 mm to 1.6 mm, so that the length of the photovoltaic module can be 2278 mm to 2382 mm and the width 1134 mm.The current of the four-segment cell is 1 / 4 of the current of the bent cell, so the current of the individual cell string 1 is also 1 / 4 of the current of the complete cell, thereby reducing the power loss of the individual cell string 1 and achieving the power increase of the photovoltaic module. The photovoltaic module comprises several cell strings 1 connected in series by the four-segment cells, and the four cell strings 1 are connected in parallel by the busbar 2. Then, several groups of cell strings are connected in series to match the output current of the photovoltaic module to the output current of the cell string 1 connected in series by the bent cell.

[0033] As in Fig. 1 and Fig. As shown in Figure 2, the busbar 2 comprises the first busbar 21, the second busbar 22, and the third busbar 23, which are used to connect multiple cell strings 1. Along the first direction X, the first busbar 21, the second busbar 22, and the third busbar 23 are spaced apart from each other, and one end of the first busbar 21, opposite the second busbar 22, is a first terminal end, and a first junction box is provided at the first terminal end, with the first busbar 21 and the second busbar 22 being connected to the first junction box.One end of the second busbar 22, opposite the third busbar 23, is a second connection end, and a second junction box is provided at the second connection end, with the second busbar 22 and the third busbar 23 being connected to the second junction box, the first junction box and the second junction box being connected to the external equipment.

[0034] As in Fig. 1, Fig. 2 and Fig. As shown in Figure 3, the photovoltaic module also includes a connecting wire 3, wherein the connecting wire 3 is connected to the busbar 2 and extends along the second direction Y, the second direction Y being perpendicular to the first direction X, so that the connecting wire 3 can connect multiple busbars 2. In some embodiments of the present disclosure, along the width direction X of the connecting wire 3, the distance between adjacent multi-segment cells 11 is smaller than the width of the connecting wire 3, and along the thickness direction Z of the multi-segment photovoltaic module, the connecting wire 3 is arranged on one side of the multi-segment cells 11. Along the thickness Z of the photovoltaic module, a separating element 5 is provided between the connecting wire 3 and the multi-segment cell 11 to separate the multi-segment cell 11 from the connecting wire 3.

[0035] The insulating element 5 consists of an insulating material. The connecting wire 3 is a conductive metal strip. By arranging the insulating element 5 between the connecting wire 3 and the multi-segment cell 11, the possibility of a short circuit due to contact between the connecting wire 3 and the cell can be reduced, thereby increasing the safety of the photovoltaic module.

[0036] In some embodiments of the present disclosure, the width of the switching wire 3 is between 4 mm and 8 mm and the thickness of the switching wire 3 is between 0.15 mm and 0.4 mm.

[0037] If the width of the connecting wire 3 is less than 4 mm and its thickness is less than 0.15 mm, the cross-sectional area of ​​the connecting wire 3 is smaller, resulting in poor overcurrent capacity and inability to handle the current in the photovoltaic module. If the width of the connecting wire 3 is greater than 8 mm, the overlap area between the connecting wire 3 and the multi-segment cells 11 increases. During the lamination process, this increases the risk of hidden cracks in the multi-segment cells 11. If the photovoltaic module is a double-glass module, both sides of the multi-segment cells 11 are used for sunlight absorption. If the width of the connecting wire 3 is too large, the shielding of the multi-segment cells 11 increases, thus reducing power generation efficiency. Therefore, the width of the connecting wire 3 can be 4 mm, 6 mm, 8 mm, etc.Along the width direction X of the connecting wire 3, the distance between adjacent multi-segment cells 11 is 1.6 mm, which is less than the width of the connecting wire 3. Therefore, the connecting wire 3 is positioned on one side of the thickness direction Z of the multi-segment cells 11. If the thickness of the connecting wire 3 is greater than 0.4 mm, causing it to protrude a larger amount from the multi-segment cells 11, the likelihood of the connecting wire 3 compressing the multi-segment cells 11 during the lamination process increases, potentially leading to hidden cracks. Furthermore, the likelihood of deformation of the connecting wire 3 increases, which could result in a short circuit due to contact between the connecting wire 3 and the multi-segment cells 11. Therefore, the thickness of the connecting wire 3 can be 0.15 mm, 0.3 mm, 0.4 mm, etc.

[0038] In some embodiments of the present disclosure, the width L6 of the insulating element 5 is between 8 mm and 18 mm and the thickness L8 of the insulating element 5 is between 0.15 mm and 0.25 mm.

[0039] The insulating element 5 serves to separate the connecting wire 3 from the multi-segment cell 11. The connecting wire 3 is positioned centrally on the insulating element 5 to reduce the possibility of a short circuit due to contact. Therefore, the width of the insulating element 5 must be greater than the width of the connecting wire 3. If the width L6 of the insulating element 5 is less than 8 mm, the probability of a short circuit due to contact between the connecting wire 3 and the multi-segment cell 11 increases. If the width of the insulating element 5 is greater than 18 mm, the overlapping area between the insulating element 5 and the multi-segment cell 11 also increases, leading to increased stress on the multi-segment cell 11 from the insulating element 5 during the lamination process. In double-glass modules, this has a significant impact on energy generation efficiency.Therefore, the width of the insulating element 5 can be 8 mm, 13 mm, 18 mm, etc. The insulating element 5 is positioned between the connecting wire 3 and the multi-segment cell 11. If the thickness of the insulating element 5 is greater than 0.25 mm, the thickness of both the connecting wire 3 and the insulating element 5 is too large. During the lamination process, the stress at the points where the connecting wire 3 is located is high, which can easily lead to hidden cracks in the multi-segment cell 11. The insulating element 5 serves as insulation between the connecting wire 3 and the multi-segment cell 11. The insulating performance of the insulating element 5 decreases with decreasing thickness. If the thickness of the insulating element 5 is less than 0.15 mm, its insulating performance is poor, and there is a high probability of a short circuit between the connecting wire 3 and the multi-segment cell 11.Therefore, the thickness of the insulating element can be 0.15 mm, 0.2 mm, 0.25 mm, etc.

[0040] As in Fig. 2, Fig. 4 and Fig. As shown in Figure 5, in some embodiments of the present disclosure, the connecting wire 3 comprises a first connecting wire 31 that overlaps the second busbar 22. A first connection element 4 is provided on one side of the first connecting wire 31 that is away from the second busbar 22. A first bending section 211 is provided at one end of the first busbar that is adjacent to the second busbar 22. Both the first connection element 4 and the first bending section 211 extend along the thickness direction Z of the photovoltaic module to form the first connection end.

[0041] During assembly of the photovoltaic module, the connecting wire 3 is first connected to the insulating element 5 and then placed on the multi-segmented cell 11. At the point where the first connecting wire 31 overlaps the second busbar 22, the insulating element 5 is provided with a notch to bypass the second busbar 22, so that the distance between the second busbar 22 and an edge of the insulating element 5 is 1 mm to 2 mm, which facilitates soldering the first connecting wire 31 and the second busbar 22. In this embodiment, the photovoltaic module can comprise three cell string groups. Each cell string group comprises four cell strings 1 arranged in a matrix pattern. Each cell string 1 comprises several four-segmented cells connected in series. Edge busbars 24 are provided along the second direction Y on both sides of each cell string group.The first busbar 21 is located in the center of the first cell strand groups and is connected to the edge busbar 24 to form a first cell strand group consisting of four cell strands 1 connected in parallel. The second busbar 22 is located in the center of the second cell strand group and is connected to the edge busbar 24 to form the second cell strand group consisting of four cell strands 1 connected in parallel. The third busbar 23 is located in the center of the third cell strand group and is connected to the edge busbar 24 to form the third cell strand group consisting of four cell strands 1 connected in parallel. The edge busbar 24 of the second cell strand group is connected to the edge busbar 24 of the third cell strand group, so that the second and third cell strand groups are connected in series.The two ends of the first connecting wire 31 are each connected to the two edge busbars 24 of the first cell string group. The first connecting wire 31 overlaps the second busbar 22 to connect the third cell string group to the second cell string group in series.

[0042] The busbar 2, the connecting wire 3, and the connecting wire are all conductive metal bars. The first connecting element 4 is connected to the first busbar 21, which can carry the current within the first busbar 21. A diode is installed in the first junction box. The first connecting element 4 and the first bending section 211 are each connected to the two ends of the diode. In the event of a failure in the second or third cell string group, the diode can divert the current around the faulty cell string group, thus protecting the circuit. The first connecting element 4 is spaced apart from the first bending section 211.The first connection element 4 is provided on one side of the first connecting wire 31 that is away from the second busbar 22, so that the position of the first connection element 4 can be adjusted in the direction away from the first bending section 211 along the extension direction of the second busbar 22, so that the first connection element 4 can contact the first connecting wire 31, thereby increasing the distance between the first connection element 4 and the first bending section 211, reducing the possibility of a short circuit due to accidental contact between the first connection element 4 and the first bending section 211 and improving the safety of the photovoltaic module.

[0043] As in Fig. As shown in Figure 5, in some embodiments of the present disclosure, the first connection element 4 comprises a first fastening section 41 and a first connection section 42. The first fastening section 41 is connected to the first connecting wire 31, and there is an angle between the first connection section 42 and the first fastening section 41, such that the first connection section 42 extends along the thickness direction Z of the photovoltaic module.

[0044] The first connecting wire 31 is soldered to the second busbar 22, and the first mounting section 41 is soldered to the first connecting wire 31. The connecting wire forms an angle with the first mounting section 41, so that the first connecting section 42 of the first connection element 4 can be connected to the first junction box and runs approximately parallel to the first bending section 211 of the first busbar 21, thereby reducing the possibility of accidental contact between the first connecting section 42 and the first bending section 211 and improving the safety of the photovoltaic module.

[0045] As in Fig. As shown in Figure 5, in some embodiments of the present disclosure the width of the first fastening section 41 is greater than or equal to the width of the first switching wire 31.

[0046] The first mounting section 41 is soldered to the first connecting wire 31, and the width of the first mounting section 41 increases, which can improve the reliability of the first mounting section 41 and the first connecting wire 31 after soldering. If the end of the first mounting section 41 protrudes from the first connecting wire 31 and the thickness of the connecting wire 31 is small, the protruding portion of the first mounting section 41 can be bent in a direction adjacent to the second busbar 22, so that the portion of the first mounting section 41 protruding beyond the first connecting wire 31 is soldered to the second busbar 22, which can further improve the reliability of the connection element after soldering.

[0047] As in Fig. 6 and Fig. As shown in Figure 7, in some embodiments of the present disclosure, a fifth bending section 222 is provided on one side of the second busbar 22 next to the first busbar 21. The fifth bending section 222 extends along the thickness direction Z of the photovoltaic module and is parallel to the first bending section 211.

[0048] The first connecting wire 31 is located at the point where the second busbar 22 with the fifth bend section 222 is provided and is soldered to the second busbar 22, so that the current within the connecting wire 3 can be carried out through the fifth bend section 222. The second busbar 22 is bent to form the fifth bend section 222, thereby reducing the number of soldering operations on the first connecting wire, thus reducing the risk of open solder joints and improving the reliability of the photovoltaic module.

[0049] As in Fig. 1 and Fig. As shown in Figure 2, in some embodiments of the present disclosure, the switching wire 3 also comprises a second switching wire 32. The second switching wire 32 is arranged between the second busbar 22 and the third busbar 23. The two ends of the second switching wire 32 are each connected to two edge busbars 24 of the second cell strand group and two edge busbars 24 of the third cell strand group.

[0050] Two diodes are provided in the second junction box. The end of the second busbar 22, which is closer to the third busbar 23, is connected to one end of a diode; one side of the second connecting wire 32 is connected to the other end of a diode; the other side of the second connecting wire 32 is connected to one end of another diode; and the other end of the third busbar 23 is connected to the other end of yet another diode. If one or more multi-segment cells 11 in the second cell string group 11 or one or more multi-segment cells 11 in the third cell string group fail, the diodes in the second junction box with the second connecting wire 32 conduct, bypassing the faulty cell string group and protecting the circuit.

[0051] As in Fig. 8, Fig. 9 and Fig. As shown in Figure 10, in some embodiments of the present disclosure, a second bent section 221 is provided at one end of the second busbar 22 adjacent to the second connecting wire 32, and a third bent section 231 is provided at one end of the third busbar 23 adjacent to the second connecting wire 32. The second connecting wire 32 comprises a fourth bent section 321, which is arranged between the second bent section 221 and the third bent section 231. The second bent section 221, the third bent section 231, and the fourth bent section 321 are all bent along the thickness direction Z of the photovoltaic module and form a second connection end. The second connecting wire 32 need not be connected to the second busbar 22 or the third busbar 23.Therefore, the insulating element 5, which is arranged between the second switching wire 32 and the multi-segment cell 11, is a continuous insulating strip, and it is not necessary to attach a bypass structure to the second busbar 22 or the third busbar 23, which simplifies the arrangement of the insulating element 5 and improves the assembly efficiency of the photovoltaic module.

[0052] The second bending section 221, the third bending section 231, and the fourth bending section 321 all extend along the thickness direction Z of the photovoltaic module, so that the second connection end protrudes from the photovoltaic module, which facilitates connection to the second junction box. The second bending section 221, the third bending section 231, and the fourth bending section 321 all extend in the same direction and can have an approximately parallel structure, which reduces the possibility of a short circuit due to accidental contact between the second bending section 221, the third bending section 231, and the fourth bending section 321.

[0053] As in Fig. As shown in Figure 11, in some embodiments of the present disclosure, the second connecting wire 32 comprises a first straight segment 322 and a second straight segment 323, as well as a fourth bent section 321 arranged between the first straight segment 322 and the second straight segment 323. Both the first straight segment 322 and the second straight segment 323 extend along the second direction Y. The end of the first straight segment 322 and the second straight segment 323 that is furthest from the fourth bent section 321 is connected to the edge busbar 24. The fourth bent segment 321 comprises a first bent segment 321a and a second bent segment 321b, both of which extend along the thickness direction Z of the photovoltaic module.One end of the first curved segment 321a is connected to one end of the second curved segment 321b, the other end of the first curved segment 321a is connected to the first straight segment 322, and the other end of the second curved segment 321b is connected to the second straight segment 323, so that the second switching wire 32 has a C-shaped structure.

[0054] A gap or mutual adhesion may exist between the side walls of the first bent segment 321a and the second bent segment 321b in the fourth bent section 321, allowing the fourth bent section 321 to extend along the thickness direction Z of the photovoltaic module. The first straight segment 322, the second straight segment 323, and the fourth bent section 321 are bent and shaped by the second connecting wire 32, thereby reducing the probability of detachment of the fourth bent section 321 and improving the reliability after the connection between the second terminal end and the second junction box.

[0055] As in Fig. As shown in Figure 12, in some embodiments of the present disclosure, the second connecting wire 32 comprises a first body section 324 and a second body section 325. The first body section 324 extends along the second direction Y, and the second body section 325 comprises a third straight segment 325a and a third curved segment 325b. The third straight segment 325a extends along the second direction Y, and the third curved segment 325b extends along the thickness direction Z of the photovoltaic module, resulting in an L-shaped structure for the second body section 325. One end of the third curved segment 325b is soldered to the first body section 324 within the second body section 325, and the distant ends of the first body section 324 and the second body section 325 are each connected to the edge busbar 24.

[0056] The first body section 324 is soldered to the second body section 325, thus connecting the two. The current in the first body section 324 can be transferred to the second junction box via the third bent segment 325b in the second body section 325. The second body section 325 has an L-shaped structure, which reduces the number of bends required and thus simplifies its processing. The position of the second body section 325 can be determined based on the positions of the second busbar 22 and the third busbar 23, ensuring that the three connecting wires of the second terminal lie in a straight line, facilitating the connection between the second terminal and the second junction box.

[0057] As in Fig. As shown in Figure 13, in some embodiments of the present disclosure, a second connection element 8 is provided on the second connecting wire 32. The second connection element 8 comprises a second mounting section 81 and a second connection section 82. The second mounting section 81 extends along the second direction Y and is soldered to and attached to the second connecting wire 32. The second connection section 82 extends along the thickness direction Z of the photovoltaic module.

[0058] The second terminal element 8 is soldered to the second connecting wire 32, allowing current to flow through the second connecting element 8 to the second junction box. The position of the second terminal wire 32 within the second connecting wire 32 can be determined based on the positions of the second busbar 22 and the third busbar 23, ensuring that the three connecting wires of the second terminal end lie in a straight line, thus facilitating the connection between the second terminal end and the second junction box.

[0059] As in Fig. 4 and Fig.As shown in Figure 8, the photovoltaic module includes a first connection hole 6 and a second connection hole 7. The cross-sectional area of ​​the first connection hole 6 is less than or equal to that of the second connection hole 7. The first connection end is connected to the first junction box via the first connection hole 6, and the second connection end is connected to the second junction box via the second connection hole 7.

[0060] Along the second direction Y, the first busbar 21, the second busbar 22, the third busbar 23, the first terminal hole 6, and the second terminal hole 7 are all arranged between adjacent cell strings 1. The distance between the busbar and the cell string 1 is 3 mm, and the distance between the first terminal hole 6, the second terminal hole 7, and the cell string 1 is 1 mm to 2 mm. This reduces the possibility of a short circuit caused by water vapor from the environment entering the interior of the photovoltaic module through the first terminal hole 6 or the second terminal hole 7 and then contacting the multi-segment cell 11. Furthermore, the busbar can be routed out through the first terminal hole 6 or the second terminal hole 7.The first connection end comprises two connecting wires, one of which is the first bend section 211 of the first busbar 21 and the other the fifth bend section 222 of the second busbar 22 or the first connection section 42 of the first connection element 4. The second connection end comprises three connecting wires, one of which is the second bend section 221 of the second busbar 22, another the third bend section 231 of the third busbar 23, and another either the fourth bend section 321 or the third bent segment 325b or the second connection section 82 in the second connecting wire 32. The first connection hole 6 and the second connection hole 7 can be waisted holes or through holes of a rectangular, elliptical, or other shape.To maintain the distance between the first terminal hole 6, the second terminal hole 7, and the multi-segment cell 11, the size of the first terminal hole 6 and the second terminal hole 7 is defined along the second direction Y. The cross-sectional area of ​​the first terminal hole 6 is less than or equal to that of the second terminal hole 7. Along the first direction X, the size of the first terminal hole 6 can be reduced so that the connecting wires at the first end are all located within the area of ​​the first terminal hole 6. Along the first direction X, the size of the second terminal hole 7 is relatively large, which allows the distance between several connecting wires at the second terminal end to be increased, thereby reducing the possibility of a short circuit due to accidental contact between multiple connecting wires at the second terminal end.

[0061] The present disclosure relates to a photovoltaic module comprising cell strings 1. Each cell string 1 comprises multi-segment cells 11 connected in series. Two ends of one of the cell strings 1 are provided with a busbar 2 for connecting the multi-segment cells 1, the busbar 2 comprising a first busbar 21, a second busbar 22, and a third busbar 23. Along a first direction X, the first busbar 21, the second busbar 22, and the third busbar 23 are spaced apart from one another. An end of the first busbar 21 opposite the second busbar 22 is a first connection end, and an end of the second busbar 22 opposite the third busbar 23 is a second connection end. The photovoltaic module further comprises a first connecting wire 31, the first connecting wire 31 overlapping the second busbar 22.A first bending section 211 is provided at one end of the first busbar 21 next to the second busbar 22. One side of the first connecting wire 31, which is away from the second busbar 22, is provided with a first connection element 4. This facilitates the adjustment of a distance between the first connection element 4 and the first bending section 211, thereby reducing the possibility of a short circuit due to accidental contact between the first connection element 4 and the first bending section 211 and improving the safety of the photovoltaic module.

[0062] The foregoing are merely exemplary embodiments of the present disclosure, which, as mentioned above, do not serve to limit the present disclosure. Any modification, equivalent substitution, improvement, etc., falls within the scope of protection of the present disclosure.

Claims

[1] Photovoltaic module, comprising: Cell strands (1), each cell strand comprising multi-segmented cells (11) connected in series; two ends of one of the cell strands (1) are provided with a busbar (2) to connect the cell strands (1); the busbar (2) comprising a first busbar (21), a second busbar (22), and a third busbar (23); along a first direction, the first busbar (21), the second busbar (22), and the third busbar (23) are spaced apart from each other, one end of the first busbar (21) opposite the second busbar (22) being a first connection end, and one end of the second busbar (22) opposite the third busbar (23) being a second connection end; and a switching wire (3) which is connected to the busbar (2) and extends along a second direction perpendicular to the first direction; wherein the switching wire (3) comprises a first switching wire (31) and a second switching wire (32), wherein the first switching wire (31) is arranged between the first busbar (21) and the second busbar (22) and overlaps the second busbar (22), wherein the second switching wire (32) is arranged between the second busbar (22) and the third busbar (23); a second bending section (221) is provided at one end of the second busbar (22) adjacent to the second switching wire (32), and a third bending section (231) is provided at one end of the third busbar (23) adjacent to the second switching wire (32); and the second connecting wire (32) includes a fourth bending section (321), and the second bending section (221), the third bending section (231) and the fourth bending section (321) are all bent along a thickness direction of the photovoltaic module to form the second connection end. [2] Photovoltaic module according to claim 1, wherein a first connection element (4) is provided on a side of the first connecting wire (31) that is away from the second busbar (22), and a first bending section (211) is provided at an end of the first busbar (21) that is adjacent to the second busbar (22), wherein the first connection element (4) and the first bending section (211) both extend along a thickness direction of the photovoltaic module to form the first connection end. [3] Photovoltaic module according to claim 2, wherein the first connection element (4) comprises a first fastening section (41) and a first connection section (42), an angle is formed between the first fastening section (41) and the first connection section (42), the first fastening section (41) is connected to the first connecting wire (31) and the first connection section (42) extends along the thickness of the photovoltaic module. [4] Photovoltaic module according to claim 3, wherein a width of the first fastening section (41) is greater than or equal to a width of the first connecting wire (31). [5] Photovoltaic module according to claim 4, wherein a section of the first fastening section (41) extending beyond the first connecting wire (31) is bent in the direction of the second busbar (22) and soldered to it. [6] Photovoltaic module according to claim 1, wherein the second connecting wire (32) further comprises a first straight segment (322) and a second straight segment (323), wherein the first straight segment (322) and the second straight segment (323) both extend along the second direction and the fourth bending section (321) is arranged between the first straight segment (322) and the second straight segment (323); wherein the fourth bending section (321) comprises a first bent segment (321a) and a second bent segment (321b), wherein the first bent segment (321a) and the second bent segment (321b) both extend along the thickness direction of the photovoltaic module and are connected to each other over one end of the first bent segment (321a) and one end of the second bent segment (321b), wherein another end of the first bent segment (321a) is connected to the first straight segment (322) and another end of the second bent segment (321b) is connected to the second straight segment (323). [7] Photovoltaic module according to claim 6, wherein a gap or mutual adhesion is provided between the side walls of the first bent segment (321a) and the second bent segment (321b) and the fourth bending section (321) extends along the thickness of the photovoltaic module. [8] Photovoltaic module according to claim 1, wherein the connecting wire (3) is arranged along the thickness of the photovoltaic module on one side of the multi-segmented cell (11); and along the width direction of the connecting wire (3) the distance between two adjacent segmented cells (11) is less than the width of the connecting wire (3), wherein the photovoltaic module comprises an insulating element (5), wherein the insulating element (5) is provided between the connecting wire (3) and the multi-segmented cell (11) along the thickness direction of the photovoltaic module. [9] Photovoltaic module according to claim 8, wherein in the insulating element (5) a notch is provided at a point where the first connecting wire (31) overlaps the second busbar (22) in order to bypass the second busbar (22), and wherein a distance between the second busbar (22) and an edge of the insulating element (5) is 1 mm to 2 mm. [10] Photovoltaic module according to claim 8, wherein the insulating element (5) arranged between the second connecting wire (32) and the multi-segment cell (11) is a continuous insulating strip. [11] Photovoltaic module according to claim 8, wherein the width of the connecting wire (3) is between 4 mm and 8 mm and the thickness of the connecting wire (3) is between 0.15 mm and 0.4 mm. [12] Photovoltaic module according to claim 8, wherein the width of the insulating element (5) is between 8 mm and 18 mm and the thickness of the insulating element (5) is between 0.15 mm and 0.25 mm. [13] Photovoltaic module according to claim 1, further comprising a first connection hole (6) and a second connection hole (7), wherein the first connection end is brought out of the first connection hole (6), the second connection end is brought out of the second connection hole (7) and a cross-sectional area of ​​the first connection hole (6) is less than or equal to a cross-sectional area of ​​the second connection hole (7). [14] Photovoltaic module according to claim 13, wherein the distance between the busbars (2) and the cell strings (1) is 3 mm; and the distance between the first connection hole 6 and the second connection hole 7 to the cell string 1 is between 1 mm and 2 mm. [15] Photovoltaic module according to claim 1, wherein the multi-segment cell (11) is a four-segment cell and along the second direction (Y) there is an overlap area width between adjacent four-segment cells of between 0.2 mm and 0.6 mm.

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