Solar power generation module

Abstract

This invention relates to a solar power generation module. [Solution] The solar power generation module includes a plurality of battery strings, each battery string includes a plurality of multicut cells connected in series, and busbars for connecting the plurality of battery strings are provided at either end of the plurality of battery strings. The busbars include a first busbar, a second busbar, and a third busbar, and the first, second, and third busbars are spaced apart along a first direction, with one opposing end of the first and second busbars being a first lead end, and the one opposing end of the second and third busbars being a second lead end. The solar power generation module further includes a first jumper wire, which overlaps with the second busbar. A first bend is provided at one end of the first busbar adjacent to the second busbar, and a first lead member is provided on the side of the first jumper wire away from the second busbar.

Description

Technical Field

[0001] The present invention relates to the technical field of solar power generation, and particularly to a solar power generation module.

Background Art

[0002] In a solar power generation module, light energy is converted into electrical energy by the photovoltaic effect of battery cells, and a plurality of battery cells are connected in series by busbars, so that the electrical energy generated by the battery cells is collected by the busbars and then derived. In the prior art, the battery cells in a battery string are half-cut cells. As the size of the battery cells increases, the current in a single battery string increases, thereby increasing the power loss of the solar power generation module.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The present invention provides a solar power generation module for solving the problem of large power loss in a solar power generation module.

Means for Solving the Problems

[0004] An embodiment of the present invention provides a solar power generation module, which includes a plurality of battery strings and jumper wires. The battery string includes a plurality of multi-cut cells connected in series. A busbar for connecting the plurality of battery strings is provided at both ends of the plurality of battery strings. The busbar includes 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 provided at intervals. One end of the first busbar facing the second busbar is a first lead-out end, and one end of the second busbar facing the third busbar is a second lead-out end. The jumper wire is connected to the busbar and extends along a second direction, and the second direction and the first direction are perpendicular to each other. The jumper wire includes a first jumper wire and a second jumper wire. The first jumper wire is located between the first busbar and the second busbar and overlaps with the second busbar. The second jumper wire is located between the second busbar and the third busbar, and a second bend is provided at one end of the second busbar adjacent to the second jumper wire. The second jumper wire includes a fourth bend. The second, third, and fourth bends are all bent along the thickness direction of the solar power generation module to form a second lead-out end.

[0005] In one possible embodiment, a first lead member is provided on the side of the first jumper wire away from the second busbar, and a first bend is provided at one end of the first busbar adjacent to the second busbar, and both the first lead member and the first bend extend along the thickness direction of the photovoltaic module to form a first lead end.

[0006] In one possible embodiment, the first lead member includes a first fixed portion and a first lead portion, with an angle between the first fixed portion and the first lead portion, the first fixed portion being connected to a first jumper wire, and the first lead portion extending along the thickness direction of the photovoltaic module.

[0007] In one possible embodiment, the width of the first fixing portion is greater than or equal to the width of the first jumper wire.

[0008] In one possible embodiment, the portion of the first fixing part protruding from the first jumper wire is bent toward the second busbar, and the portion of the first fixing part protruding from the first jumper wire is welded to the second busbar.

[0009] In one possible embodiment, the second jumper wire further includes a first straight segment and a second straight segment, both of which extend along a second direction, and the fourth bend is located between the first straight segment and the second straight segment, and the fourth bend includes a first bend segment and a second bend segment, both of which extend along the thickness direction of the photovoltaic module and have one end connected to the other, the other end of the first bend segment is connected to the first straight segment, and the other end of the second bend segment is connected to the second straight segment.

[0010] In one possible embodiment, a gap is provided between the sidewall of the first bent segment and the sidewall of the second bent segment, or the sidewalls of the first bent segment and the sidewalls of the second bent segment are bonded to each other, and the fourth bend extends along the thickness direction of the photovoltaic module. In one possible embodiment, along the thickness direction of the photovoltaic module, the jumper wire is located on one side of the multicut cell, along the width direction of the jumper wire, the spacing between adjacent multicut cells is smaller than the width of the jumper wire, the photovoltaic module includes a separator, along the thickness direction of the photovoltaic module, the separator is located between the jumper wire and the multicut cell.

[0011] In one possible embodiment, a notch is provided in the separator at the location where the first jumper wire and the second busbar overlap, in order to avoid the second busbar, and the distance between the second busbar and the edge of the separator is 1 mm to 2 mm. In one possible embodiment, the separator located between the second jumper wire and the multicut cell is a continuous insulating bar. In one possible embodiment, the jumper wire has a width of 4 mm to 8 mm and a thickness of 0.15 mm to 0.4 mm.

[0012] In one possible embodiment, the separator has a width of 8 mm to 18 mm and a thickness of 0.15 mm to 0.25 mm.

[0013] In one possible embodiment, the photovoltaic module includes a first lead hole and a second lead hole, the first lead end being led out of the first lead hole and the second lead end being led out of the second lead hole, and the cross-sectional area of ​​the first lead hole is less than or equal to the cross-sectional area of ​​the second lead hole. In one possible embodiment, the distance between the busbar and the battery string is 3 mm, and the distance between the first and second lead holes and the battery string is 1 mm to 2 mm. In one possible embodiment, the multi-cut cell is a quarter-cut cell, and along the second direction, the width of the overlapping region between adjacent quarter-cut cells is 0.2 mm to 0.6 mm. [Effects of the Invention]

[0014] The present invention relates to a photovoltaic module, the photovoltaic module comprising a plurality of battery strings, each battery string comprising a plurality of multicut cells connected in series, and a busbar for connecting the plurality of battery strings is provided at either end of the plurality of battery strings. The busbar comprises a first busbar, a second busbar, and a third busbar, and the first busbar, the second busbar, and the third busbar are spaced apart along a first direction, with one opposing end of the first busbar and the second busbar being a first lead end, and one opposing end of the second busbar and the third busbar being a second lead end. The photovoltaic module further comprises a first jumper wire, the first jumper wire overlapping the second busbar. A first bend is provided at one end of the first busbar adjacent to the second busbar, and a first lead member is provided on the side of the first jumper wire away from the second busbar. This facilitates adjustment of the distance between the first lead member and the first bend, reducing the possibility of accidental contact between the first lead member and the first bend causing a short circuit and improving the safety of the solar power generation module.

[0015] It should be understood that the above general description and the detailed description to be described later are merely illustrative and cannot limit the present invention.

[0016] The drawings here are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and used to explain the mechanism of the present invention together with the specification.

Brief Description of the Drawings

[0017] [Figure 1] It is a circuit diagram of a photovoltaic module according to an embodiment of the present invention. [Figure 2] It is a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention. [Figure 3] It is a diagram showing the positional relationship of a multi-cut cell, a separator, and a jumper wire according to an embodiment of the present invention. [Figure 4] It is a partially enlarged view of the I position in FIG. 2. [Figure 5] It is a schematic diagram of an embodiment of a first lead-out end according to an embodiment of the present invention. [Figure 6] It is a schematic diagram of another embodiment of a first lead-out end according to an embodiment of the present invention. [Figure 7] It is a plan view of a first lead-out end according to an embodiment of the present invention. [Figure 8] It is a partially enlarged view of the II position in FIG. 2. } [Figure 9] It is a side view of a second lead-out end according to an embodiment of the present invention. [Figure 10] It is a plan view of a second lead-out end according to an embodiment of the present invention. [Figure 11] It is a schematic structural diagram of an embodiment of a second jumper wire according to an embodiment of the present invention. [Figure 12] It is a schematic structural diagram of another embodiment of a second jumper wire according to an embodiment of the present invention. [Figure 13] It is a schematic structural diagram of another embodiment of a second jumper wire according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0018] To better understand the technical concept of the present invention, embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0019] It should be made clear that the embodiments described represent only a portion of the present invention, not all embodiments. All other embodiments that a person skilled in the art could obtain without creative work based on the embodiments of the present invention are all within the scope of the protection of the present invention.

[0020] The terms used in the embodiments of the present invention are for the sole purpose of describing specific embodiments and are not intended to limit the invention. The singular forms of “one type,” “the said,” and “the said” used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0021] It is important to understand that the terms "and / or" as used herein refer only to the relationship describing the related objects, and that there may be three types of relationships. For example, A and / or B can indicate three situations: A existing alone, A and B existing simultaneously, or B existing alone. Also, the symbol " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0022] It should be noted that directional terms such as "up," "down," "left," and "right" described in the embodiments of the present invention are described in terms of angles shown in the drawings and should not be understood as limitations to the embodiments of the present invention. Furthermore, when the context refers to one element being connected to the "up" or "down" of another element, it should be understood that this connection may be not only direct but also indirect, via an intermediate element.

[0023] As shown in Figures 1 and 2, embodiments of the present invention provide a photovoltaic module comprising a plurality of battery strings 1, each of which has busbars 2 at both ends to connect the plurality of battery strings 1, photovoltaic glass is provided on the front of the battery strings 1 along the thickness direction Z of the photovoltaic module, an adhesive film layer is provided between the photovoltaic glass and the battery strings 1, a back plate or photovoltaic glass is provided on the back of the battery strings 1, and an adhesive film layer is also provided between the battery strings 1 and the back plate or photovoltaic glass, forming a laminated body after lamination. A frame is provided along the circumferential direction of the laminated body to protect the edges of the laminated body and form the photovoltaic module.

[0024] The battery string 1 includes a plurality of multicut cells 11 connected in series. The present invention does not limit the structure of the multicut cells 11, and the types of multicut cells 11 include, but are not limited to, a Passivated Emitter Rear Cell (PERC), a Tunnel Oxide Passivated Contact (TOPCon), a Heterojunction with Intrinsic Thin-film (HJT), an Interdigitated Back Contact (IBC), a perovskite battery, a multi-main grid battery (MBB), a no-main grid battery (0BB), and the like.

[0025] In the case of PERC batteries, along the thickness direction, the PERC battery consists of, in order: a front metallic silver electrode, a front silicon nitride passivation layer, a phosphorus layer emitter, a P-type base silicon layer, a local aluminum backfield, a metallic aluminum back electrode, and a back passivation layer (Al2O3 / SiN x)Includes.PERC batteries passivate the back surface using a passivation film instead of an all-aluminum backfield, enhancing internal back surface reflection of light rays on the silicon base, reducing the recombination rate of the back surface, and improving battery efficiency by 0.5% to 1%.

[0026] In the TOPCon battery, along its thickness direction, it contains, in order, a metallic silver electrode, a front silicon nitride passivation layer, a boron-doped emitter, an N-type base silicon layer, a diffusion-doped layer, an ultrathin silicon oxide layer, doped polysilicon, silicon nitride, and a metallic silver electrode. The back surface of the battery consists of one ultrathin silicon oxide layer (1 nm to 2 nm) and one phosphorus-doped microcrystalline amorphous mixed Si thin film, both of which together form a passivation contact structure. This structure can prevent the recombination of minority holes and improve the open-circuit voltage and short-circuit current of the battery. The ultrathin oxide layer can tunnel majority carrier electrons into the polycrystalline silicon layer and prevent the recombination of minority holes. Due to the excellent passivation effect of the ultrathin silicon oxide and highly doped silicon thin films, a bending occurs in the energy band on the silicon wafer surface, forming a field passivation effect. This significantly increases the electron tunneling probability, reduces contact resistance, improves the open-circuit voltage and short-circuit current of the battery, and enhances the battery's conversion efficiency.

[0027] In the case of an HJT battery, along its thickness direction, the HJT battery includes, in order: a front low-temperature silver electrode, a front conductive thin film, an N-type amorphous silicon thin film, an intrinsic amorphous silicon thin film, an N-type base silicon layer, an intrinsic amorphous silicon thin film, a P-type amorphous silicon thin film, a back conductive thin film, and a back low-temperature silver electrode.

[0028] In the case of an IBC battery, along its thickness direction, it includes, in order, a silicon nitride reflective layer, an N+ front field, an N-type base silicon layer, a P+ emitter, an N+ back field, an aluminum oxide passivation layer, a silicon nitride anti-reflective layer, and a metallic silver electrode. Using ion implantation technology, the IBC battery can obtain P and N regions with good uniformity and precisely controllable junction depth. It eliminates grid line shielding on the front of the battery, eliminates light-shielding current loss in the metal electrode, and enables maximum utilization of incident photons. It can improve the short-circuit current by about 7% compared to a normal solar cell. Due to the back contact structure, there is no need to consider grid line shielding problems. By appropriately widening the grid line ratio, it is possible to reduce series resistance and have a high fill factor. Optimal design for surface passivation and surface light confinement structures can be achieved, resulting in a low front recombination rate and surface reflection.

[0029] In the case of a perovskite battery, along its thickness direction, it includes, in order, a substrate material, a conductive thin film, an electron transmission layer (titanium dioxide), a perovskite absorption layer (hole transmission layer), and a metal cathode. Perovskite materials have a high light absorption coefficient and a long carrier diffusion distance, and after photons absorbed by the perovskite material are converted into electrons, they are easily collected at the electrodes, resulting in low losses. This allows for the generation of high photovoltaic voltage and current, and perovskites exhibit high photoelectric conversion efficiency.

[0030] In multi-main grid batteries, multiple main grids for collecting current are provided on the surface of the battery cell, shortening the current conduction path in the multi-main grid battery, reducing internal losses, and further improving the power of the multi-main grid battery. As the number of main grids increases, the cross-sectional area of ​​the main grids and welding strips decreases, the adhesive film layer becomes thinner, and the production cost of the solar power generation module can be reduced. As the number of main grids increases, the number of fine grids may decrease accordingly, further reducing the production cost of the battery cell.

[0031] In main-gridless batteries, the battery cell surface lacks a main grid. After multiple battery cells are welded together, the weld strip is directly connected to a fine grid instead of the original main grid, reducing the consumption of silver paste and lowering the production cost of the battery cells. Main-gridless batteries reduce the light-shielding area of ​​the grid lines in the battery cells, reduce fine grid transmission loss, and improve the total power of the module. At the same time, the increase in fine grid contact points reduces the risk of hidden cracks in thin silicon wafers, improving yield and reliability.

[0032] Multiple multi-cut cells 11 in the battery string 1 can be welded together using overlap welding technology. Two adjacent multi-cut cells 11 overlap each other, with an overlap area size of 0.2 mm to 0.6 mm. By providing a welding strip in the overlapping area of ​​two adjacent multi-cut cells 11, the two adjacent multi-cut cells 11 are connected in series, forming the battery string 1. By connecting multiple multi-cut cells 11 in the battery string 1 in series through overlap welding, the spacing between the multiple multi-cut cells 11 in the battery string 11 is reduced, increasing the proportion of the area of ​​the multi-cut cells 11 that occupies the photovoltaic module, further increasing the effective light absorption area in the photovoltaic module, and thus increasing the power generation of the photovoltaic module. When two adjacent multi-cut cells 11 are provided overlapping and a welding strip is provided in the overlapping area, stress concentration problems are likely to occur in the overlapping area during the lamination process. A buffer layer may be provided in the overlapping area of ​​two adjacent multi-cut cells 11 to reduce the possibility of hidden cracks in the multi-cut cells 11 during the lamination process.

[0033] The multi-cut cell 11 may be a half-cut cell, a one-third cut cell, a one-quarter cut cell, etc. Taking a one-quarter cut cell as an example, a full cell is divided into four equal parts to form a one-quarter cut cell. Depending on the size of the full cell, the length of the one-quarter cut cell may be 182.3 mm, and the width may be 46.675 mm to 53.25 mm. After multiple one-quarter cut cells are stacked and welded together in the battery string 1, the width of the overlapping area between adjacent one-quarter cut cells may be 0.2 mm to 0.6 mm, and the spacing between adjacent battery strings 1 may be 1.2 mm to 1.6 mm. As a result, the length of the solar power generation module may be 2278 mm to 2382 mm, and the width may be 1134 mm. Since the current of a one-quarter cut cell is 1 / 4 of the current of a folded battery cell, the current of a single battery string 1 is also 1 / 4 of the current of a full cell, which reduces power loss in a single battery string 1 and improves the power of the solar power generation module. The solar power generation module includes a battery string 1 in which multiple quarter-cut cells are connected in series. A busbar 2 connects four battery strings 1 in parallel to form a battery string group, and multiple battery string groups are further connected in series to make the output current of the solar power generation module the same as the output current of a battery string 1 in which bent battery cells are connected in series.

[0034] As shown in Figures 1 and 2, the busbar 2 includes a first busbar 21, a second busbar 22, and a third busbar 23 for connecting multiple groups of battery strings 1. Along a first direction X, the first busbar 21, the second busbar 22, and the third busbar 23 are spaced apart, with one opposing end of the first busbar 21 and the second busbar 22 being a first lead end, with a first junction box provided at the first lead end, and the first busbar 21 and the second busbar 22 connected to the first junction box, and the one opposing end of the second busbar 22 and the third busbar 23 being a second lead end, with a second junction box provided at the second lead end, and the second busbar 22 and the third busbar 23 connected to the second junction box, and the first and second junction boxes are connected to external equipment.

[0035] As shown in Figures 1, 2, and 3, the photovoltaic module further includes a jumper wire 3, which is connected to a busbar 2 and extends along a second direction Y, the second direction Y being perpendicular to the first direction X, so that the jumper wire 3 can connect multiple busbars 2. In one possible embodiment, along the width direction X of the jumper wire 3, the spacing between adjacent multicut cells 11 is smaller than the width of the jumper wire 3, and along the thickness direction Z of the photovoltaic module, the jumper wire 3 is located on one side of the multicut cells 11. Along the thickness direction Z of the photovoltaic module, a separator 5 is provided between the jumper wire 3 and the multicut cells 11 to separate the multicut cells 11 and the jumper wire 3.

[0036] The separator 5 is made of an insulating material, and the jumper wire 3 is a conductive metal bar. By installing the separator 5 between the jumper wire 3 and the multi-cut cell 11, the possibility of a short circuit due to contact between the jumper wire 3 and the battery cell can be reduced, thereby improving the safety of the solar power generation module.

[0037] In one possible embodiment, the jumper wire 3 has a width of 4 mm to 8 mm and a thickness of 0.15 mm to 0.4 mm.

[0038] If the width of the jumper wire 3 is less than 4 mm and the thickness is less than 0.15 mm, the cross-sectional area of ​​the jumper wire 3 becomes small, which reduces the overcurrent capacity of the jumper wire 3 and prevents it from loading current into the photovoltaic module. If the width of the jumper wire 3 is greater than 8 mm, the size of the overlapping area between the jumper wire 3 and the multi-cut cell 11 increases, increasing the risk of hidden cracks in the multi-cut cell 11 due to the jumper wire 3 during the lamination process. If the photovoltaic module is a double-glass module, both sides of the multi-cut cell 11 are used to absorb sunlight, and if the width of the jumper wire 3 is too large, the shielding to the multi-cut cell 11 increases, further affecting the power generation efficiency. Therefore, the width of the jumper wire 3 may be 4 mm, 6 mm, 8 mm, etc. Along the width direction X of the jumper wire 3, the spacing between adjacent multi-cut cells 11 is 1.6 mm, which is smaller than the width of the jumper wire 3, so the jumper wire 3 is provided on one side of the multi-cut cell 11 in the thickness direction Z. If the thickness of the jumper wire 3 is greater than 0.4 mm, the amount that the jumper wire 3 protrudes from the multi-cut cell 11 increases, increasing the possibility that the jumper wire 3 will press against the multi-cut cell 11 during the lamination process, causing hidden cracks in the multi-cut cell 11. It also increases the possibility that the jumper wire 3 will deform, which may cause contact between the jumper wire 3 and the multi-cut cell 11 and result in a short circuit. For this reason, the thickness of the jumper wire 3 may be 0.15 mm, 0.3 mm, 0.4 mm, etc.

[0039] In one possible embodiment, the separator 5 has a width of 8 mm to 18 mm and a thickness of 0.15 mm to 0.25 mm.

[0040] The separator 5 is used to separate the jumper wire 3 from the multi-cut cell 11. The jumper wire 3 is placed in the center of the separator 5 to reduce the possibility of a short circuit due to contact. For this reason, the width of the separator 5 must be greater than the width of the jumper wire 3. If the width of the separator 5 is less than 8 mm, the possibility of a short circuit due to contact between the jumper wire 3 and the multi-cut cell 11 increases. If the width of the separator 5 is greater than 18 mm, the area of ​​the overlapping region between the separator 5 and the multi-cut cell 11 also increases accordingly. This increases the influence of the separator 5 on the multi-cut cell 11 during the lamination process, which has a greater impact on the power generation efficiency in a double-glass module. Therefore, the width of the separator 5 may be 8 mm, 13 mm, 18 mm, etc. The separator 5 is located between the jumper wire 3 and the multi-cut cell 11. If the thickness of the separator 5 is greater than 0.25 mm, the thickness of the jumper wire 3 and the separator 5 will be too large, resulting in increased stress at the location of the jumper wire 3 during the lamination process, which can easily cause hidden cracks in the multi-cut cell 11. The separator 5 plays an insulating role between the jumper wire 3 and the multi-cut cell 11. The insulating performance of the separator 5 decreases as the thickness of the separator 5 decreases. If the thickness of the separator 5 is less than 0.15 mm, the insulating performance of the separator 5 deteriorates, increasing the possibility of a short circuit between the jumper wire 3 and the multi-cut cell 11. Therefore, the thickness of the insulating material may be 0.15 mm, 0.2 mm, 0.25 mm, etc.

[0041] As shown in Figures 2, 4, and 5, the jumper wire 3 includes a first jumper wire 31, which overlaps with the second bus bar 22. A first lead member 4 is provided on the side of the first jumper wire 31 away from the second bus bar 22, and a first bent portion 211 is provided on one end of the first bus bar 21 adjacent to the second bus bar 22. Both the first lead member 4 and the first bent portion 211 extend along the thickness direction Z of the solar power generation module, forming a first lead end.

[0042] In the process of assembling the solar power generation module, the jumper wire 3 is first bonded to the separator 5, and then laid on the multi-cut cell 11. At the position where the first jumper wire 31 and the second busbar 22 overlap, a notch is provided in the separator 5 to avoid the second busbar 22, and the distance between the second busbar 22 and the edge of the separator 5 is set to 1 mm to 2 mm, making it easier to weld the first jumper wire 31 and the second busbar 22. In embodiments of the present invention, the solar power generation module may include three groups of battery strings, each group of battery strings including four matrix-arranged battery strings 1, each battery string 1 including a plurality of quarter-cut cells connected in series, and edge busbars 24 are provided on both sides of each group of battery strings along the second direction Y, the first busbar 21 is located in the middle of the first group of battery strings, the first busbar 21 and edge busbar 24 connect the four battery strings 1 in parallel to form the first group of battery strings, the second busbar 22 is located in the middle of the second group of battery strings, and the second busbar 22 and edge busbar 24 connect the four battery strings The rings 1 are connected in parallel to form a second battery string group, the third busbar 23 is located in the middle of the third battery string group, the third busbar 23 and edge busbar 24 connect four battery strings 1 in parallel to form a third battery string group, however, the second battery string group and the third battery string group are connected in series by connecting the edge busbar 24 of the second battery string group and the edge busbar 24 of the third battery string group, both ends of the first jumper wire 31 are connected to the two edge busbars 24 of the first battery string group, and the third battery string group and the second battery string group are connected in series by overlapping the first jumper wire 31 and the second busbar 22.

[0043] The busbar 2, jumper wire 3, and lead wire are all conductive metal bars, and the first lead member 4 is connected to the first busbar 21, allowing it to draw current from the first busbar 21. A diode is provided in the first junction box, and the first lead member 4 and the first bent portion 211 are connected to the ends of the diode, respectively. In the event of a failure in the second or third battery string group, the diode can protect the circuit by skipping the faulty battery string group. The first lead member 4 is provided at a distance from the first bent portion 211, and is located on the side of the first jumper wire 31 away from the second busbar 22. This allows the position of the first lead member 4 to be adjusted away from the first bent portion 211 along the extending direction X of the second busbar 22. The first lead member 4 only needs to be brought into contact with the first jumper wire 31. Furthermore, by increasing the gap between the first lead member 4 and the first bent portion 211, the possibility of the first lead member 4 and the first bent portion 211 accidentally coming into contact and causing a short circuit can be reduced, thereby improving the safety of the solar power generation module.

[0044] As shown in Figure 5, in one possible embodiment, the first lead member 4 includes a first fixed portion 41 and a first lead portion 42, the first fixed portion 41 being connected to a first jumper wire 31, and there being an angle between the first lead portion 42 and the first fixed portion 41, so that the first lead portion 42 extends along the thickness direction Z of the photovoltaic module.

[0045] The first jumper wire 31 is welded to the second busbar 22, and the first fixing part 41 is welded to the first jumper wire 31, creating an angle between the lead wire and the first fixing part 41. This allows the first lead part 42 of the first lead member 4 to be connected to the first junction box and to be substantially parallel to the first bent part 211 of the first busbar 21. Furthermore, it reduces the possibility of accidental contact between the first lead part 42 and the first bent part 211, thereby improving the safety of the solar power generation module.

[0046] As shown in Figure 5, in one possible embodiment, the width of the first fixing portion 41 is greater than or equal to the width of the first jumper wire 31.

[0047] The first fixing portion 41 is welded to the first jumper wire 31, and the increased width of the first fixing portion 41 improves the reliability of the welded connection between the first fixing portion 41 and the first jumper wire 31. If the end of the first fixing portion 41 protrudes from the first jumper wire 31, the thickness of the jumper wire 3 is reduced, and the portion of the first fixing portion 41 that protrudes from the first jumper wire 31 may be bent toward the second busbar 22. The portion of the first fixing portion 41 that protrudes from the first jumper wire 31 can be welded to the second busbar 22 to further improve the reliability of the welded connection member.

[0048] As shown in Figures 6 and 7, in one possible embodiment, a fifth bend 222 is provided on the side of the second busbar 22 adjacent to the first busbar 21, the fifth bend 222 extends along the thickness direction Z of the photovoltaic module, and the fifth bend 222 is parallel to the first bend 211.

[0049] The first jumper wire 31 is located at the position where the fifth bend 222 of the second busbar 22 is provided, and is welded to the second busbar 22, thereby allowing the current in the jumper wire 3 to be drawn out through the fifth bend 222. By bending the second busbar 22 to form the fifth bend 222, the number of welds at the first lead end position can be reduced, further reducing the risk of cracking at the weld and improving the reliability of the solar power generation module.

[0050] As shown in Figures 1 and 2, in one possible embodiment, jumper wire 3 further includes a second jumper wire 32, which is located between the second busbar 22 and the third busbar 23, with both ends of the second jumper wire 32 connected to two edge busbars 24 of the second battery string group and two edge busbars 24 of the third battery string group, respectively.

[0051] The second junction box is provided with two diodes. One end of the second busbar 22, adjacent to the third busbar 23, is connected to one end of one diode. One end of the second jumper wire 32 is connected to the other end of one diode, and the other end of the second jumper wire 32 is connected to one end of the other diode. The third busbar 23 is connected to the other end of the other diode. If a multicut cell 11 in the second battery string group or a multicut cell 11 in the third battery string group fails, the diode in the second junction box conducts with the second jumper wire 32, protecting the circuit by skipping the failed battery string group.

[0052] As shown in Figures 8, 9, and 10, in one possible embodiment, a second bend 221 is provided at one end of the second busbar 22 adjacent to the second jumper wire 32, and a third bend 231 is provided at one end of the third busbar 23 adjacent to the second jumper wire 32. The second jumper wire 32 includes a fourth bend 321, which is located between the second bend 221 and the third bend 231. The second bend 221, the third bend 231, and the fourth bend 321 are all bent along the thickness direction Z of the photovoltaic module to form a second lead-out end. Since the second jumper wire 32 does not need to be connected to the second bus bar 22 or the third bus bar 23, the separator 5 located between the second jumper wire 32 and the multicut cell 11 is a continuous insulating bar, eliminating the need to provide a bypass structure on the second bus bar 22 or the third bus bar 23, making it easy to install the insulating member 5, which is advantageous for improving the assembly efficiency of the photovoltaic power generation module.

[0053] The second bending portion 221, the third bending portion 231, and the fourth bending portion 321 all extend along the thickness direction Z of the photovoltaic module, so that the second lead-out end protrudes from the photovoltaic module, facilitating connection with the second junction box. The second bending portion 221, the third bending portion 231, and the fourth bending portion 321 all extend along the same direction and may have a substantially parallel structure, thereby reducing the possibility that the second bending portion 221, the third bending portion 231, and the fourth bending portion 321 accidentally come into contact and cause a short circuit.

[0054] As shown in FIG. 11, in one possible embodiment, the second jumper wire 32 includes a first straight segment 322 and a second straight segment 323. The fourth bending portion 321 is located between the first straight segment 322 and the second straight segment 323. The first straight segment 322 and the second straight segment 323 both extend in the second direction Y. One end of the first straight segment 322 and the second straight segment 323 away from the fourth bending portion 321 is connected to the edge bus bar 24. The fourth bending portion 321 includes a first bending segment 321a and a second bending segment 321b. The first bending segment 321a and the second bending segment 321b both extend along the thickness direction Z of the photovoltaic module, and one end of the first bending segment 321a is connected to one end of the second bending segment 321b. The other end of the first bending segment 321a is connected to the first straight segment 322, and the other end of the second bending segment 321b is connected to the second straight segment 323, thereby forming a "Z" - shaped structure for the second jumper wire 32.

[0055] It should be noted that in the translation of the last paragraph of the original text, there seems to be an error in the description of the shape formed by the second jumper wire. Based on the context, it should be a "Z" - shaped structure instead of a "几" - shaped structure. The above translation has been corrected accordingly.A gap may exist between the side wall of the first bent segment 321a and the side wall of the second bent segment 321b in the fourth bent portion 321, or they may be bonded together, as long as the fourth bent portion 321 extends along the thickness direction Z of the photovoltaic module. The first straight segment 322, the second straight segment 323 and the fourth bent portion 321 are bent and formed by the second jumper wire 32, reducing the possibility of the fourth bent portion 321 falling off and improving reliability after the second lead end and the second junction box are connected.

[0056] As shown in Figure 12, in one possible embodiment, the second jumper wire 32 includes a first body portion 324 and a second body portion 325, the first body portion 324 extending along a second direction Y, and the second body portion 325 including a third straight segment 325a and a third bent segment 325b, the third straight segment 325a extending along the second direction Y, and the third bent segment 325b extending along the thickness direction Z of the photovoltaic module, giving the second body portion 325 an L-shaped structure. One end of the second body portion 325 on which the third bent segment 325b is provided is welded to the first body portion 324, and the two separate ends of the first body portion 324 and the second body portion 325 are each connected to an edge busbar 24.

[0057] The first main body 324 and the second main body 325 are welded together, thereby creating communication between them, and the current in the first main body 324 is transmitted to the second junction box via the third bent segment 325b of the second main body 325. The second main body 325 has an L-shaped structure, which reduces the number of bends and thus the difficulty of processing the second main body 325. The position of the second main body 325 can be determined according to the positions of the second busbar 22 and the third busbar 23, aligning the three lead wires of the second lead end in the same straight line and facilitating the connection between the second lead end and the second junction box.

[0058] As shown in Figure 13, in one possible embodiment, a second lead member 8 is provided on the second jumper wire 32, and the second lead member 8 includes a second fixing portion 81 and a second lead portion 82, the second fixing portion 81 extending along a second direction Y and welded to the second jumper wire 32, and the second lead portion 82 extending along the thickness direction Z of the photovoltaic module.

[0059] By welding the second lead member 8 to the second jumper wire 32, the current in the second jumper wire 32 can be conducted to the second junction box via the second lead member 8. The position of the second jumper wire 32 on the second lead member 8 may be determined according to the positions of the second busbar 22 and the third busbar 23, thereby aligning the three lead wires of the second lead end in the same straight line and facilitating the connection between the second lead end and the second junction box.

[0060] As shown in Figures 4 and 8, the photovoltaic module includes a first lead hole 6 and a second lead hole 7, the cross-sectional area of ​​the first lead hole 6 being less than or equal to the cross-sectional area of ​​the second lead hole 7. The first lead end is led out of the first lead hole 6 and connected to the first junction box, and the second lead end is led out of the second lead hole 7 and connected to the second junction box.

[0061] Along the second direction Y, the first busbar 21, the second busbar 22, the third busbar 23, the first lead hole 6, and the second lead hole 7 are all located between adjacent battery strings 1, with a spacing of 3 mm between the busbars and the battery strings 1, and a spacing of 1 mm to 2 mm between the first lead hole 6 and the second lead hole 7 and the battery strings 1, thereby reducing the possibility of water vapor in the environment entering the photovoltaic module through the first lead hole 6 or the second lead hole 7 and coming into contact with the multicut cells 11 for a short circuit, and also allowing the busbars to be led out from the first lead hole 6 or the second lead hole 7. The first lead end includes two lead wires, one of which is the first bend 211 of the first busbar 21, and the other is the fifth bend 222 of the second busbar 22 or the first lead 42 of the first lead member 4. The second lead end includes three lead wires, one of which is the second bent portion 221 of the second busbar 22, another is the third bent portion 231 of the third busbar 23, and yet another is one of the fourth bent portion 321, the third bent segment 325b, or the second lead portion 82 of the second jumper wire 32. The first lead hole 6 and the second lead hole 7 may be elongated holes, or through holes with a rectangular, elliptical, or other cross-sectional shape. In order to maintain the spacing between the first lead hole 6 and the second lead hole 7 and the multi-cut cell 11, the sizes of the first lead hole 6 and the second lead hole 7 are constant along the second direction Y, the cross-sectional area of ​​the first lead hole 6 is less than or equal to the cross-sectional area of ​​the second lead hole 7, the size of the first lead hole 6 can be reduced along the first direction X, and all lead wires of the first end should be positioned within the range of the first lead hole 6. Along the first direction X, the size of the second lead hole 7 is large, increasing the spacing between the multiple lead wires at the second lead end, and further reducing the possibility of the multiple lead wires at the second lead end accidentally touching and short-circuiting.

[0062] The present invention relates to a photovoltaic power generation module, the photovoltaic power generation module includes a plurality of battery strings 1, each battery string 1 includes a plurality of multicut cells 11 connected in series, and busbars 2 for connecting the plurality of battery strings 1 are provided at either end of the plurality of battery strings 1. The busbars 2 include a first busbar 21, a second busbar 22, and a third busbar 23, which are spaced apart along a first direction X, with one opposing end of the first busbar 21 and the second busbar 22 being a first lead end, and one opposing end of the second busbar 22 and the third busbar 23 being a second lead end. The photovoltaic power generation module further includes a first jumper wire 31, which overlaps with the second busbar 22. A first bent portion 211 is provided at one end of the first busbar 21 adjacent to the second busbar 22, and a first lead member 4 is provided on the side of the first jumper wire 31 away from the second busbar 22. This facilitates adjustment of the distance between the first lead member 4 and the first bent portion 211, reducing the possibility of accidental contact between the first lead member 4 and the first bent portion 211 causing a short circuit and improving the safety of the solar power generation module.

[0063] The above are merely preferred embodiments of the present invention and do not limit it; to those skilled in the art, the present invention is subject to various modifications and changes. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be within the scope of protection of the present invention. [Explanation of Symbols]

[0064] 1-Battery String 11-Multi-Cut Cell 2-Bus Bar 21-1st Bus Bar 211-First Folding Section 22 - Second Bus Bar 221-Second Folding Section 222-5th folding section 23-3rd Bus Bar 231-Third Folding Section 24-Edge Busbar 3-Jumper wire 31-1st Jumper Cable 32 - Second jumper wire 321-Fourth Folding Section 321a - First Folded Segment 321b - Second folded segment 322 - First Straight Segment 323 - Second Straight Segment 324-First main body 325 - Second main body 325a - Third Straight Segment 325b - Third folded segment 4-First drawer member 41-1st fixed part 42-First drawer section 5-Separator 6-1st drawer hole 7-2nd drawer hole 8-Second drawer member 81-Second fixed part 82-Second drawer section

Claims

1. It is a solar power generation module, The aforementioned solar power generation module includes a plurality of battery strings (1) and jumper wires (3), The battery string (1) includes a plurality of multicut cells (11) connected in series, and a busbar (2) for connecting the plurality of battery strings (1) is provided at both ends of the plurality of battery strings (1), and the busbar (2) includes a first busbar (21), a second busbar (22), and a third busbar (23), and the first busbar (21), the second busbar (22), and the third busbar (23) are spaced apart along a first direction, one opposing end of the first busbar (21) and the second busbar (22) is a first lead end, and one opposing end of the second busbar (22) and the third busbar (23) is a second lead end. The jumper wire (3) is connected to the busbar (2) and extends along the second direction, and the second direction and the first direction are perpendicular to each other. The jumper wire (3) includes a first jumper wire (31) and a second jumper wire (32), wherein the first jumper wire (31) is located between the first bus bar (21) and the second bus bar (22) and overlaps with the second bus bar (22), and the second jumper wire (32) is located between the second bus bar (22) and the third bus bar (23), and has a second bent portion (221) at one end of the second bus bar (22) adjacent to the second jumper wire (32). A photovoltaic power generation module is provided, and a third bent portion (231) is provided at one end of the third busbar (23) adjacent to the second jumper wire (32), and the second jumper wire (32) includes a fourth bent portion (321), and the second bent portion (221), the third bent portion (231), and the fourth bent portion (321) are all bent along the thickness direction of the photovoltaic power generation module to form a second lead end.

2. The photovoltaic module according to claim 1, characterized in that a first lead member (4) is provided on the side of the first jumper wire (31) away from the second busbar (22), a first bent portion (211) is provided on one end of the first busbar (21) adjacent to the second busbar (22), and both the first lead member (4) and the first bent portion (211) extend along the thickness direction of the photovoltaic module and form a first lead end.

3. The photovoltaic power generation module according to claim 2, wherein the first lead member (4) includes a first fixed portion (41) and a first lead portion (42), with an angle between the first fixed portion (41) and the first lead portion (42), the first fixed portion (41) is connected to the first jumper wire (31), and the first lead portion (42) extends along the thickness direction of the photovoltaic power generation module.

4. The photovoltaic power generation module according to claim 3, characterized in that the width of the first fixing portion (41) is greater than or equal to the width of the first jumper wire (31).

5. The photovoltaic module according to claim 4, characterized in that the portion of the first fixing portion (41) protruding from the first jumper wire (31) is bent in a direction toward the second busbar (22), and the portion of the first fixing portion (41) protruding from the first jumper wire (31) is welded to the second busbar (22).

6. The second jumper wire (32) further includes a first straight segment (322) and a second straight segment (323), both of which extend along a second direction, and the fourth bent portion (321) is located between the first straight segment (322) and the second straight segment (323), and the fourth bent portion (321) is located between the first bent segment (321a) and the second bent segment The photovoltaic module according to claim 1, further comprising (321b), wherein the first bent segment (321a) and the second bent segment (321b) both extend along the thickness direction of the photovoltaic module, and one end thereof is connected to one another, the other end of the first bent segment (321a) is connected to the first straight segment (322), and the other end of the second bent segment (321b) is connected to the second straight segment (323).

7. The photovoltaic module according to claim 6, characterized in that a gap is provided between the side wall of the first bent segment (321a) and the side wall of the second bent segment (321b), or the side walls of the first bent segment (321a) and the side walls of the second bent segment (321b) are bonded to each other, and the fourth bent portion (321) extends along the thickness direction of the photovoltaic module.

8. The photovoltaic module according to claim 1, characterized in that the jumper wire (3) is located on one side of the multicut cell (11) along the thickness direction of the photovoltaic module, the spacing between adjacent multicut cells (11) along the width direction of the jumper wire (3) is smaller than the width of the jumper wire (3), the photovoltaic module includes a separator (5), and the separator (5) is located between the jumper wire (3) and the multicut cell (11) along the thickness direction of the photovoltaic module.

9. The photovoltaic module according to claim 8, characterized in that a notch is provided in the separator (5) at the position where the first jumper wire (31) and the second bus bar (22) overlap, in order to avoid the second bus bar (22), and the distance between the second bus bar (22) and the edge of the separator (5) is 1 mm to 2 mm.

10. The photovoltaic module according to claim 8, characterized in that the separator (5) located between the second jumper wire (32) and the multicut cell (11) is a continuous insulating bar.

11. The solar power generation module according to claim 8, characterized in that the jumper wire (3) has a width of 4 mm to 8 mm and a thickness of 0.15 mm to 0.4 mm.

12. The photovoltaic power generation module according to claim 8, characterized in that the separator (5) has a width of 8 mm to 18 mm and a thickness of 0.15 mm to 0.25 mm.

13. The photovoltaic power generation module according to claim 1, wherein the photovoltaic power generation module includes a first lead hole (6) and a second lead hole (7), the first lead end is led out from the first lead hole (6), the second lead end is led out from the second lead hole (7), and the cross-sectional area of ​​the first lead hole (6) is less than or equal to the cross-sectional area of ​​the second lead hole (7).

14. The photovoltaic module according to claim 13, characterized in that the distance between the busbar (2) and the battery string (1) is 3 mm, and the distance between the first lead hole (6) and the second lead hole (7) and the battery string (1) is 1 mm to 2 mm.

15. The photovoltaic power generation module according to claim 1, characterized in that the multi-cut cell (11) is a quarter-cut cell, and the width of the overlapping region between adjacent quarter-cut cells along the second direction is 0.2 mm to 0.6 mm.

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