Photovoltaic module

Abstract

The photovoltaic module comprises a plurality of battery strings, each battery string comprises a plurality of multi-fragmented battery pieces which are connected in series, and bus bars are arranged at the two ends of each battery string so as to connect the battery strings. The bus bars comprise a first bus bar, a second bus bar and a third bus bar, the first bus bar, the second bus bar and the third bus bar are arranged at intervals in the first direction, the opposite ends of the first bus bar and the second bus bar are first leading-out ends, and the opposite ends of the second bus bar and the third bus bar are second leading-out ends. The photovoltaic module further comprises a first jumper wire which is overlapped with the second bus bar. A first bending part is arranged at one end, close to the second bus bar, of the first bus bar, and a first lead-out piece is arranged on one side, away from the second bus bar, of the first jumper wire, so that the distance between the first lead-out piece and the first bending part is conveniently adjusted, and the possibility of short circuit caused by mistaken touch between the first lead-out piece and the first bending part is reduced; and the safety of the photovoltaic module is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic power generation technology, and in particular to a photovoltaic module. Background Art

[0002] Photovoltaic modules convert light energy into electrical energy through the photovoltaic effect of the cells. Multiple cells are connected in series through bus bars, so that the electrical energy generated by the cells is collected by the bus bars and then exported. In the prior art, the cells in a cell string are divided into two pieces. As the size of the cells increases, the current in a single cell string is larger, resulting in a large power loss in the photovoltaic module. Summary of the invention

[0003] The present application provides a photovoltaic module for solving the problem of large power loss in the photovoltaic module.

[0004] The present application provides a photovoltaic module, which includes:

[0005] A plurality of battery strings, the battery strings comprising a plurality of multi-slice battery slices connected in series, bus bars are arranged at both ends of the plurality of battery strings to connect the plurality of battery strings; the bus bars comprise a first bus bar, a second bus bar and a third bus bar, the first bus bar, the second bus bar and the third bus bar are arranged at intervals along a first direction, an end of the first bus bar opposite to the second bus bar is a first lead-out end, and an end of the second bus bar opposite to the third bus bar is a second lead-out end;

[0006] A jumper, which is connected to the bus bar and extends along a second direction, wherein the second direction is perpendicular to the first direction;

[0007] Among them, the jumper includes a first jumper, the first jumper overlaps with the second bus bar, a first lead-out piece is arranged on the side of the first jumper away from the second bus bar, a first bending portion is arranged on the end of the first bus bar close to the second bus bar, and the first lead-out piece and the first bending portion both extend along the thickness direction of the photovoltaic module to form a first lead-out end.

[0008] In a possible embodiment, the first lead-out member includes a first fixing portion and a first lead-out portion, an angle is formed between the first fixing portion and the first lead-out portion, the first fixing portion is connected to the first jumper, and the first lead-out portion extends along the thickness direction of the photovoltaic module.

[0009] In a possible embodiment, the width of the first fixing portion is greater than or equal to the width of the first jumper.

[0010] In a possible embodiment, the jumper further includes a second jumper, and the second jumper is located between the second bus bar and the third bus bar.

[0011] In a possible embodiment, a second bus bar is provided with a second bending portion at one end close to the second jumper, a third bus bar is provided with a third bending portion at one end close to the second jumper, the second jumper includes a fourth bending portion, and the second bending portion, the third bending portion and the fourth bending portion are all bent along the thickness direction of the photovoltaic module to form a second lead-out end.

[0012] In a possible embodiment, the second jumper also includes a first straight section and a second straight section, both of which extend along the second direction, and the fourth bending portion is located between the first straight section and the second straight section; the fourth bending portion includes a first bending section and a second bending section, both of which extend along the thickness direction of the photovoltaic component, and one end of which is connected to each other, the other end of the first bending section is connected to the first straight section, and the other end of the second bending section is connected to the second straight section.

[0013] In a possible embodiment, along the thickness direction of the photovoltaic module, the jumper is located on one side of the multi-slice solar cell, and along the width direction of the jumper, the spacing between adjacent multi-slice solar cells is smaller than the width of the jumper; the photovoltaic module includes an isolating member, and along the thickness direction of the photovoltaic module, the isolating member is located between the jumper and the multi-slice solar cell.

[0014] In a 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.

[0015] In a possible embodiment, the width of the isolating element is 8 mm to 18 mm, and the thickness is 0.15 mm to 0.25 mm.

[0016] In a possible embodiment, the photovoltaic component includes a first lead-out hole and a second lead-out hole, the first lead-out end is led out through the first lead-out hole, the second lead-out end is led out through the second lead-out hole, and the cross-sectional area of ​​the first lead-out hole is less than or equal to the cross-sectional area of ​​the second lead-out hole.

[0017] The present application relates to a photovoltaic module, including a plurality of battery strings, wherein the battery strings include a plurality of multi-slice battery cells connected in series, and bus bars are provided at both ends of the plurality of battery strings to connect the plurality of battery strings. The bus bars include a first bus bar, a second bus bar and a third bus bar, and the first bus bar, the second bus bar and the third bus bar are arranged at intervals along a first direction, and the end opposite to the first bus bar and the second bus bar is a first lead-out end, and the end opposite to the second bus bar and the third bus bar is a second lead-out end. The photovoltaic module also includes a first jumper, and the first jumper overlaps the second bus bar. A first bending portion is provided at one end of the first bus bar close to the second bus bar, and a first lead-out piece is provided at a side of the first jumper away from the second bus bar, so as to facilitate adjustment of the distance between the first lead-out piece and the first bending portion, so as to reduce the possibility of the first lead-out piece and the first bending portion accidentally touching and causing a circuit short circuit, thereby improving the safety of the photovoltaic module.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A circuit diagram of a photovoltaic module provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present application;

[0021] Figure 3 A positional relationship diagram of a multi-slice battery cell, a spacer, and a jumper provided in an embodiment of the present application;

[0022] Figure 4 for Figure 2 A partial enlarged view of the middle I position;

[0023] Figure 5 A schematic diagram of an embodiment of a first lead-out terminal provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of another embodiment of the first lead-out terminal provided in the embodiment of the present application;

[0025] Figure 7 A top view of a first lead-out terminal provided in an embodiment of the present application;

[0026] Figure 8 for Figure 2 A partial enlarged view of the position of species II;

[0027] Fig. 9 A side view of a second lead-out terminal provided in an embodiment of the present application;

[0028] Fig.10 A top view of the second lead-out terminal provided in an embodiment of the present application;

[0029] Fig.11 A schematic diagram of the structure of an embodiment of a second jumper provided in an embodiment of the present application;

[0030] Fig.12 A structural schematic diagram of another embodiment of the second jumper provided in the embodiment of the present application;

[0031] Fig.13 A schematic structural diagram of another embodiment of the second jumper provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] 1- Battery string;

[0034] 11-Multi-slice battery cells;

[0035] 2-Bus bar;

[0036] 21- first bus bar;

[0037] 211- first bending portion;

[0038] 22- second bus bar;

[0039] 221- second bending portion;

[0040] 222- fifth bending portion;

[0041] 23- third bus bar;

[0042] 231- third bending portion;

[0043] 24-edge bus bar;

[0044] 3- Jumper wire;

[0045] 31- first jumper;

[0046] 32-second jumper;

[0047] 321- fourth bending portion;

[0048] 321a-first bending section;

[0049] 321b- second bending section;

[0050] 322-first straight section;

[0051] 323- the second straight section;

[0052] 324-first main body;

[0053] 325- second main body;

[0054] 325a-the third straight section;

[0055] 325b- third bending section;

[0056] 4- first lead-out member;

[0057] 41- first fixing portion;

[0058] 42- first lead-out portion;

[0059] 5- Isolation piece;

[0060] 6- first lead-out hole;

[0061] 7- second lead-out hole;

[0062] 8- second lead-out member;

[0063] 81- second fixing portion;

[0064] 82- Second lead-out portion.

[0065] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0066] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0067] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0068] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0069] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0070] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0071] like Figure 1 and Figure 2As shown, the embodiment of the present application provides a photovoltaic module, which includes a plurality of battery strings 1, bus bars 2 are arranged at both ends of the battery strings 1 to connect the plurality of battery strings 1, photovoltaic glass is arranged on the front of the battery string 1 along the thickness direction Z of the photovoltaic module, a film layer is arranged between the photovoltaic glass and the battery string 1, a back plate or photovoltaic glass is arranged on the back of the battery string 1, and a film layer is also arranged between the battery string 1 and the back plate or photovoltaic glass, and a laminate is formed after lamination. A frame is arranged along the circumference of the laminate to protect the edge of the laminate to form a photovoltaic module.

[0072] The battery string 1 includes a plurality of multi-slice battery cells 11 connected in series. The present application does not limit the structure of the multi-slice battery cell 11. The types of the multi-slice battery cell 11 include but are not limited to Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Intrinsic Thin-film Heterojunction Cell (HJT), Interdigitated Back Contact (IBC), Perovskite Cell, Multi Busbar Cell (MBB), Busbarless Cell (0BB), etc.

[0073] For PERC cells, along the thickness direction, PERC cells include front surface metal silver electrode, front surface silicon nitride passivation layer, phosphorus layer emitter, P-type base silicon layer, local aluminum back field, metal aluminum back electrode, back passivation layer (Al2O3 / SiNx). PERC cells use a passivation film to passivate the back, replacing the full aluminum back field, enhancing the internal back reflection of light in the silicon base, reducing the recombination rate on the back, and increasing the efficiency of the cell by 0.5%-1%.

[0074] For TOPCon cells, along the thickness direction, TOPCon cells include metal silver electrodes, front surface silicon nitride passivation layers, boron-doped emitters, N-type base silicon layers, diffused doping layers, ultra-thin silicon oxide, doped polysilicon, silicon nitride, and metal silver electrodes. The back of the cell is composed of a layer of ultra-thin silicon oxide (1nm to 2nm) and a layer of phosphorus-doped microcrystalline amorphous mixed Si film, which together form a passivation contact structure. This structure can block the recombination of minority carrier holes and increase the open circuit voltage and short circuit current of the cell. The ultra-thin oxide layer allows majority electrons to tunnel into the polysilicon layer while blocking the recombination of minority carrier holes. The good passivation effect of ultra-thin silicon oxide and heavily doped silicon film causes the energy band on the silicon wafer surface to bend, thereby forming a field passivation effect, greatly increasing the probability of electron tunneling, reducing contact resistance, and increasing the open circuit voltage and short circuit current of the cell, thereby improving the cell conversion efficiency.

[0075] For HJT cells, along the thickness direction, the HJT cells include 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 back conductive film, and a back low-temperature silver electrode.

[0076] For IBC cells, along the thickness direction, IBC cells include silicon nitride anti-layer, N+ front surface field, N-type base silicon layer, P+ emitter, N+ back field, aluminum oxide passivation layer, silicon nitride anti-reflection layer, and metal silver electrode. IBC cells use ion implantation technology to obtain P and N regions with good uniformity and precisely controllable junction depth. There is no grid line blocking on the front of the cell, which can eliminate the shading current loss of the metal electrode and achieve the maximum utilization of incident photons. The short-circuit current can be increased by about 7% compared with conventional solar cells; due to the back contact structure, there is no need to consider the grid line blocking problem, and the grid line ratio can be appropriately widened, thereby reducing the series resistance and having a high fill factor; the surface passivation and surface light trapping structure can be optimized to obtain a lower front surface recombination rate and surface reflection.

[0077] For perovskite cells, along the thickness direction, the perovskite cell includes substrate material, conductive film, electron transport layer (titanium dioxide), perovskite absorption layer (hole transport layer), and metal cathode. Perovskite materials have a high light absorption coefficient and a long carrier diffusion distance. After the photons absorbed by the perovskite material are converted into electrons, they are easily collected by the electrode with low loss, so they can generate higher photoelectric voltage and current, making perovskite show higher photoelectric conversion efficiency.

[0078] For multi-busbar cells, multiple busbars for collecting current are set on the surface of the cell, which shortens the current conduction path in the multi-busbar cell, reduces internal losses, and thus improves the power of the multi-busbar cell. As the number of busbars increases, the cross-sectional area of ​​the busbars and the Han Dynasty decreases, and the film layer becomes thinner, which can reduce the production cost of photovoltaic modules. As the number of busbars increases, the number of fine grids can be reduced accordingly, which can reduce the production cost of the cell.

[0079] For busbar-free cells, there is no busbar on the surface of the cell. After welding multiple cells, the welding ribbon replaces the original busbar and directly connects to the fine grid, which can reduce the consumption of silver paste and the production cost of the cell. Busbar-free cells can reduce the shading area of ​​the grid line in the cell and reduce the transmission loss of the fine grid, thereby increasing the total power of the component. At the same time, the increase in the contact points of the fine grid reduces the risk of hidden cracks in thin silicon wafers and improves the yield and reliability.

[0080] The multiple multi-slice cells 11 in the battery string 1 can be welded by lap welding technology, and two adjacent multi-slice cells 11 overlap each other, and the size of the overlapping area is 0.2mm to 0.6mm. Then, a welding strip is arranged in the overlapping area of ​​the two adjacent multi-slice cells 11, so that the two adjacent multi-slice cells 11 are connected in series to form a battery string 1. The multiple multi-slice cells 11 in the battery string 1 are connected in series by lap welding, which can reduce the spacing between the multiple multi-slice cells 11 in the battery string 11, increase the area ratio of the multi-slice cells 11 in the photovoltaic module, and then increase the effective light absorption area in the photovoltaic module, which can increase the power generation of the photovoltaic module. The two adjacent multi-slice cells 11 are overlapped, and the welding strip is arranged in the overlapping area. The problem of stress concentration is prone to occur in the overlapping area during the lamination process. A buffer layer can also be arranged in the overlapping area of ​​the two adjacent multi-slice cells 11 to reduce the possibility of hidden cracks in the multi-slice cells 11 during the lamination process.

[0081] The multi-slice cell 11 can be a two-slice cell, a three-slice cell, a four-slice cell, etc. Taking a four-slice cell as an example, the complete cell is divided into four equal parts to form a four-slice cell. According to the size of the complete cell, the length of the four-slice cell can be 182.3mm, and the width can be 46.675mm to 53.25mm. After the multiple four-slice cells in the battery string 1 are stacked and welded, the width of the overlapping area between adjacent four-slice cells can be 0.2mm to 0.6mm, and the spacing between adjacent battery strings 1 can be 1.2mm to 1.6mm, so that the length of the photovoltaic module can be 2278mm to 2382mm, and the width can be 1134mm. The current of the four-slice cell is 1 / 4 of the current of the bent cell, so the current of the single-string battery string 1 is also 1 / 4 of the current of the complete cell, which can reduce the power loss of the single-string battery string 1 and achieve power improvement of the photovoltaic module. The photovoltaic module includes a battery string 1 formed by connecting a plurality of four-slice battery cells in series. Four battery strings 1 are connected in parallel to form a battery string group through a bus bar 2, and then a plurality of battery string groups are connected in series so that the output current of the photovoltaic module is the same as the output current of the battery string 1 formed by connecting the bent battery cells in series.

[0082] like Figure 1 and Figure 2As shown, the bus bar 2 includes a first bus bar 21, a second bus bar 22 and a third bus bar 23 to connect multiple battery strings 1. Along the first direction X, the first bus bar 21, the second bus bar 22 and the third bus bar 23 are arranged at intervals, and the opposite end of the first bus bar 21 and the second bus bar 22 is a first lead-out terminal, and a first junction box is arranged at the first lead-out terminal, and the first bus bar 21 and the second bus bar 22 are connected to the first junction box, and the opposite end of the second bus bar 22 and the third bus bar 23 is a second lead-out terminal, and a second junction box is arranged at the second lead-out terminal, and the second bus bar 22 and the third bus bar 23 are connected to the second junction box, and the first junction box and the second junction box are connected to external equipment.

[0083] like Figure 1 , Figure 2 and Figure 3 As shown, the photovoltaic module further includes a jumper 3, which is connected to the bus bar 2 and extends along the second direction Y, which is perpendicular to the first direction X, so that the jumper 3 can connect multiple bus bars 2. In a possible embodiment, along the width direction X of the jumper 3, the spacing between adjacent multi-slice cells 11 is smaller than the width of the jumper 3, and along the thickness direction Z of the photovoltaic module, the jumper 3 is located on one side of the multi-slice cell 11. Along the thickness direction Z of the photovoltaic module, an isolation member 5 is provided between the jumper 3 and the multi-slice cell 11 to separate the multi-slice cell 11 from the jumper 3.

[0084] The isolator 5 is made of insulating material, and the jumper 3 is a conductive metal strip. The isolator 5 is arranged between the jumper 3 and the multi-slice battery cell 11, which can reduce the possibility of short circuit caused by contact between the jumper 3 and the battery cell, thereby improving the safety of the photovoltaic module.

[0085] In a 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.

[0086] If the width of the jumper 3 is less than 4 mm and the thickness is less than 0.15 mm, the cross-sectional area of ​​the jumper 3 is small, resulting in poor current capacity of the jumper 3 and inability to carry the current in the photovoltaic module. If the width of the jumper 3 is greater than 8 mm, the size of the overlapping area between the jumper 3 and the multi-slice battery cell 11 increases. During the lamination process, the risk of hidden cracks in the multi-slice battery cell 11 caused by the jumper 3 increases. If the photovoltaic module is a double-glass module, both sides of the multi-slice battery cell 11 are used to absorb sunlight. If the width of the jumper 3 is too large, it will increase the shading of the multi-slice battery cell 11, thereby affecting the power generation efficiency. Therefore, the width of the jumper 3 can be 4 mm, 6 mm, 8 mm, etc. Along the width direction X of the jumper 3, the spacing between adjacent multi-slice battery cells 11 is 1.6 mm, which is smaller than the width of the jumper 3. Therefore, the jumper 3 is set on one side of the thickness direction Z of the multi-slice battery cell 11. If the thickness of the jumper wire 3 is greater than 0.4 mm, the jumper wire 3 will protrude from the multi-slice battery cell 11 to a larger extent. During the lamination process, the jumper wire 3 will be more likely to squeeze the multi-slice battery cell 11, causing hidden cracks in the multi-slice battery cell 11. The jumper wire 3 may also be more likely to deform, causing the jumper wire 3 to contact the multi-slice battery cell 11 and cause a short circuit. Therefore, the thickness of the jumper wire 3 may be 0.15 mm, 0.3 mm, 0.4 mm, etc.

[0087] In a possible embodiment, the width of the isolating member 5 is 8 mm to 18 mm, and the thickness is 0.15 mm to 0.25 mm.

[0088] The spacer 5 is used to separate the jumper 3 from the multi-slice battery cell 11. The jumper 3 is arranged in the center of the spacer 5 to reduce the possibility of short circuit caused by contact. Therefore, the width of the spacer 5 needs to be greater than the width of the jumper 3. If the width of the spacer 5 is less than 8mm, the possibility of short circuit caused by contact between the jumper 3 and the multi-slice battery cell 11 will increase; if the width of the spacer 5 is greater than 18mm, the area of ​​the overlap between the spacer 5 and the multi-slice battery cell 11 will also increase, resulting in an increase in the influence of the spacer 5 on the multi-slice battery cell 11 during the lamination process. In the double-glass module, the influence on the power generation efficiency is relatively large. Therefore, the width of the spacer 5 can be 8mm, 13mm, 18mm, etc. The isolating member 5 is located between the jumper 3 and the multi-slice battery cell 11. If the thickness of the isolating member 5 is greater than 0.25 mm, the thickness of the jumper 3 and the isolating member 5 is too large. During the lamination process, the stress at the position of the jumper 3 is relatively large, which may easily lead to hidden cracks in the multi-slice battery cell 11. The isolating member 5 plays an insulating role between the jumper 3 and the multi-slice battery cell 11. The insulating performance of the isolating member 5 decreases as the thickness of the isolating member 5 decreases. If the thickness of the isolating member 5 is less than 0.15 mm, the insulating performance of the isolating member 5 is poor, and the possibility of a short circuit between the jumper 3 and the multi-slice battery cell 11 is relatively high. Therefore, the thickness of the insulating member can be 0.15 mm, 0.2 mm, 0.25 mm, etc.

[0089] like Figure 2 , Figure 4 and Figure 5 As shown, the jumper 3 includes a first jumper 31, which overlaps with the second bus bar 22. A first lead-out piece 4 is arranged on the side of the first jumper 31 away from the second bus bar 22. A first bending portion 211 is arranged on the end of the first bus bar 21 close to the second bus bar 22. The first lead-out piece 4 and the first bending portion 211 both extend along the thickness direction Z of the photovoltaic module to form a first lead-out end.

[0090] During the process of assembling the photovoltaic module, the jumper 3 is first bonded to the isolation member 5, and then laid on the multi-slice battery cell 11. The isolation member 5 is provided with a notch at the position where the first jumper 31 and the second bus bar 22 overlap, so as to avoid the second bus bar 22, so that the distance between the second bus bar 22 and the edge of the isolation member 5 is 1 mm to 2 mm, which is convenient for welding the first line 31 and the second bus bar 22. In the embodiment of the present application, the photovoltaic module may include three groups of battery strings, each group of battery strings includes four battery strings 1 arranged in a matrix, and the battery string 1 includes a plurality of four-slice battery cells connected in series. Along the second direction Y, edge bus bars 24 are provided on both sides of each group of battery strings, the first bus bar 21 is located in the middle of the first group of battery strings, and the first bus bar 21 and the edge bus bar 24 connect the four battery strings 1 in parallel to form the first battery string, and the second bus bar 22 is located in the middle of the second group of battery strings, and the second bus bar 22 and the edge bus bar 24 connect the four battery strings 1 in parallel to form the first battery string. The battery strings 1 are connected in parallel to form a second battery string group, the third bus bar 23 is located in the middle of the third battery string group, the third bus bar 23 and the edge bus bar 24 connect the four battery strings 1 in parallel to form a third battery string group, wherein the edge bus bar 24 of the second battery string group is connected to the edge bus bar 24 of the third battery string group, so that the second battery string group and the third battery string group are connected in series, the two ends of the first jumper 31 are respectively connected to the two edge bus bars 24 of the first battery string group, the first jumper 31 overlaps the second bus bar 22 to connect the third battery string group in series with the second battery string group.

[0091] The bus bar 2, the jumper 3 and the lead wire are all conductive metal bars. The first lead-out piece 4 is connected to the first bus bar 21 and can lead out the current in the first bus bar 21. A diode is arranged in the first junction box. The first lead-out piece 4 and the first bent portion 211 are respectively connected to the two ends of the diode. When the second battery string group or the third battery string group fails, the diode can make the current jump over the battery string group with the fault, thereby protecting the circuit. The first lead-out piece 4 is arranged at intervals from the first bent portion 211. The first lead-out piece 4 is arranged on the side of the first jumper 31 away from the second bus bar 22, so that the position of the first lead-out piece 4 can be adjusted along the extension direction X of the second bus bar 22, in the direction away from the first bent portion 211, so that the first lead-out piece 4 can be in contact with the first jumper 31, thereby increasing the gap between the first lead-out piece 4 and the first bent portion 211, so as to reduce the possibility of the first lead-out piece 4 and the first bent portion 211 accidentally touching and causing a short circuit, thereby improving the safety of the photovoltaic module.

[0092] like Figure 5 As shown, in a possible embodiment, the first lead-out member 4 includes a first fixed portion 41 and a first lead-out portion 42, the first fixed portion 41 is connected to the first jumper 31, and there is an angle between the first lead-out portion 42 and the first fixed portion 41, so that the first lead-out portion 42 extends along the thickness direction Z of the photovoltaic module.

[0093] The first jumper 31 is welded to the second bus bar 22, the first fixing portion 41 is welded to the first jumper 31, and an angle is formed between the lead wire and the first fixing portion 41, so that the first lead-out portion 42 of the first lead-out member 4 can be connected to the first junction box and is approximately parallel to the first bent portion 211 of the first bus bar 21, thereby reducing the possibility of accidental touching of the first lead-out portion 42 and the first bent portion 211, thereby improving the safety of the photovoltaic module.

[0094] like Figure 5 As shown, in a possible embodiment, the width of the first fixing portion 41 is greater than or equal to the width of the first jumper 31 .

[0095] The first fixing portion 41 is welded to the first jumper wire 31, and the width of the first fixing portion 41 is increased, which can improve the reliability of the welding of 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, and the thickness of the jumper wire 3 is small, the portion of the first fixing portion 41 protruding from the first jumper wire 31 can be bent toward the direction close to the second bus bar 22, so that the portion of the first fixing portion 41 protruding from the first jumper wire 31 is welded to the second bus bar 22, which can further improve the reliability of the lead-out after welding.

[0096] like Figure 6 and Figure 7As shown, in a possible embodiment, a fifth bending portion 222 is provided on one side of the second bus bar 22 close to the first bus bar 21 , the fifth bending portion 222 extends along the thickness direction Z of the photovoltaic module, and the fifth bending portion 222 is parallel to the first bending portion 211 .

[0097] The first jumper 31 is located at the position where the second bus bar 22 is provided with the fifth bend 222, and is welded to the second bus bar 22, so that the current in the jumper 3 can be led out through the fifth bend 222. The second bus bar 22 is bent to form the fifth bend 222, which reduces the number of welding times at the first lead-out end position, thereby reducing the risk of open welding and improving the reliability of the photovoltaic module.

[0098] like Figure 1 and Figure 2 As shown, in a possible embodiment, the jumper 3 also includes a second jumper 32, which is located between the second bus bar 22 and the third bus bar 23, and the two ends of the second jumper 32 are respectively connected to the two edge bus bars 24 of the second battery string group and the two edge bus bars 24 of the third battery string group.

[0099] Two diodes are provided in the second junction box, one end of the second bus bar 22 close to the third bus bar 23 is connected to one end of a diode, one side of the second jumper 32 is connected to the other end of a diode, the other side of the second jumper 32 is connected to one end of another diode, and the third bus bar 23 is connected to the other end of another diode. When a multi-slice battery cell 11 in the second battery string group fails or a multi-slice battery cell 11 in the third battery string group fails, the diode in the second junction box and the second jumper 32 are turned on to skip the battery string group with the fault, thereby protecting the circuit.

[0100] like Figure 8 , Fig. 9 and Fig.10 As shown, in a possible embodiment, the second bus bar 22 is provided with a second bending portion 221 at one end close to the second jumper 32, the third bus bar 23 is provided with a third bending portion 231 at one end close to the second jumper 32, and the second jumper 32 includes a fourth bending portion 321, and the fourth bending portion 321 is located between the second bending portion 221 and the third bending portion 231. The second bending portion 221, the third bending portion 231 and the fourth bending portion 321 are all bent along the thickness direction Z of the photovoltaic module to form a second lead-out terminal. The second jumper 32 does not need to be connected to the second bus bar 22 or the third bus bar 23, therefore, the isolation member 5 located between the second jumper 32 and the multi-slice battery sheet 11 is a continuous insulating strip, and there is no need to set a avoidance structure at the second bus bar 22 or the third bus bar 23, which facilitates the setting of the insulating member 5 and helps to improve the assembly efficiency of the photovoltaic module.

[0101] 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 terminal protrudes from the photovoltaic module, which is convenient for connection with the second junction box. The second bending portion 221, the third bending portion 231 and the fourth bending portion 321 all extend in the same direction and can be approximately parallel structures, which can reduce the possibility of the second bending portion 221, the third bending portion 231 and the fourth bending portion 321 being accidentally touched and causing a short circuit.

[0102] like Fig.11 As shown, in a possible embodiment, the second jumper 32 includes a first straight section 322 and a second straight section 323, the fourth bent portion 321 is located between the first straight section 322 and the second straight section 323, the first straight section 322 and the second straight section 323 both extend along the second direction Y, and one end of the first straight section 322 and the second straight section 323 away from the fourth bent portion 321 is connected to the edge bus bar 24. The fourth bent portion 321 includes a first bent section 321a and a second bent section 321b, the first bent section 321a and the second bent section 321b both extend along the thickness direction Z of the photovoltaic module, and one end of the first bent section 321a is connected to one end of the second bent section 321b, the other end of the first bent section 321a is connected to the first straight section 322, and the other end of the second bent section 321b is connected to the second straight section 323, so that the second jumper 32 is a "J"-shaped structure.

[0103] There may be a gap between the side wall of the first bending section 321a and the side wall of the second bending section 321b in the fourth bending section 321, or they may fit together, so that the fourth bending section 321 can extend along the thickness direction Z of the photovoltaic module. The first straight section 322, the second straight section 323 and the fourth bending section 321 are formed by bending the second jumper 32, which reduces the possibility of the fourth bending section 321 falling off and improves the reliability of the second lead-out terminal after being connected to the second junction box.

[0104] like Fig.12 As shown, in a possible embodiment, the second jumper 32 includes a first main body 324 and a second main body 325, the first main body 324 extends along the second direction Y, the second main body 325 includes a third straight section 325a and a third bent section 325b, the third straight section 325a extends along the second direction Y, and the third bent section 325b extends along the thickness direction Z of the photovoltaic module, so that the second main body 325 is an L-shaped structure. One end of the second main body 325 provided with the third bent section 325b is welded to the first main body 324, and the ends of the first main body 324 and the second main body 325 that are away from each other are respectively connected to the edge bus bar 24.

[0105] The first main body 324 is welded to the second main body 325, so that the first main body 324 and the second main body 325 are connected, and the current in the first main body 324 can be transmitted to the second junction box through the third bending section 325b in the second main body 325. The second main body 325 is an L-shaped structure, which reduces the number of bending times and can reduce the difficulty of processing the second main body 325. The position of the second main body 325 can be determined according to the position of the second bus bar 22 and the third bus bar 23, so that the three lead wires of the second lead end are located in the same straight line, which is convenient for the second lead end to be connected to the second junction box.

[0106] like Fig.13 As shown, in a possible embodiment, a second lead-out member 8 is provided on the second jumper 32, and the second lead-out member 8 includes a second fixing portion 81 and a second lead-out portion 82. The second fixing portion 81 extends along the second direction Y and is welded and fixed to the second jumper 32, and the second lead-out portion 82 extends along the thickness direction Z of the photovoltaic module.

[0107] The second lead-out member 8 is welded to the second jumper wire 32, so that the current in the second jumper wire 32 can be conducted to the second junction box through the second lead-out member 8. The position of the second lead-out member 8 in the second jumper wire 32 can be determined according to the positions of the second bus bar 22 and the third bus bar 23, so that the three lead-out wires of the second lead-out terminal are located in the same straight line, which facilitates the connection between the second lead-out terminal and the second junction box.

[0108] like Figure 4 and Figure 8 As shown, the photovoltaic assembly includes a first lead-out hole 6 and a second lead-out hole 7, and the cross-sectional area of ​​the first lead-out hole 6 is less than or equal to the cross-sectional area of ​​the second lead-out hole 7. The first lead-out terminal is connected to the first junction box after being led out from the first lead-out hole 6, and the second lead-out terminal is connected to the second junction box after being led out from the second lead-out hole 7.

[0109] Along the second direction Y, the first bus bar 21, the second bus bar 22, the third bus bar 23, the first lead-out hole 6 and the second lead-out hole 7 are all located between adjacent battery strings 1, the distance between the bus bar and the battery string 1 is 3 mm, and the distance between the first lead-out hole 6 and the second lead-out hole 7 and the battery string 1 is 1 mm to 2 mm, which can reduce the possibility of water vapor in the environment entering the interior of the photovoltaic module through the first lead-out hole 6 or the second lead-out hole 7 and contacting with the multi-slice battery sheet 11 to cause a short circuit, and can also make the bus bar lead out through the first lead-out hole 6 or the second lead-out hole 7. The first lead-out end includes two lead-out lines, one of which is the first bent portion 211 of the first bus bar 21, and the other is the fifth bent portion 222 of the second bus bar 22 or the first lead-out portion 42 of the first lead-out member 4. The second lead-out end includes three lead-out wires, one of which is the second bend 221 of the second bus bar 22, another is the third bend 231 of the third bus bar 23, and another is the fourth bend 321 or the third bend section 325b or the second lead-out portion 82 of the second jumper 32. The first lead-out hole 6 and the second lead-out hole 7 can be waist holes, or through holes with a rectangular or elliptical cross section. In order to maintain the spacing between the first lead-out hole 6 and the second lead-out hole 7 and the multi-slice battery sheet 11, along the second direction Y, the size of the first lead-out hole 6 and the second lead-out hole 7 is constant, and the cross-sectional area of ​​the first lead-out hole 6 is less than or equal to the cross-sectional area of ​​the second lead-out hole 7. Along the first direction X, the size of the first lead-out hole 6 can be reduced so that the lead-out wires at the first end are all located within the range of the first lead-out hole 6. Along the first direction X, the second lead-out hole 7 has a larger size, which can increase the spacing between the multiple lead-out wires of the second lead-out end, thereby reducing the possibility of short circuit caused by accidental contact of the multiple lead-out wires of the second lead-out end.

[0110] The present application relates to a photovoltaic module, comprising a plurality of battery strings 1, wherein the battery string 1 comprises a plurality of multi-slice battery cells 11 connected in series, and bus bars 2 are provided at both ends of the plurality of battery strings 1 to connect the plurality of battery strings 1. The bus bars 2 comprise a first bus bar 21, a second bus bar 22 and a third bus bar 23, and along a first direction X, the first bus bar 21, the second bus bar 22 and the third bus bar 23 are arranged at intervals, and the end opposite to the first bus bar 21 and the second bus bar 22 is a first lead-out end, and the end opposite to the second bus bar 22 and the third bus bar 23 is a second lead-out end. The photovoltaic module further comprises a first jumper 31, and the first jumper 31 overlaps with the second bus bar 22. A first bending portion 211 is provided at one end of the first bus bar 21 close to the second bus bar 22, and a first lead-out piece 4 is provided on the side of the first jumper 31 away from the second bus bar 22, so as to facilitate adjustment of the distance between the first lead-out piece 4 and the first bending portion 211, thereby reducing the possibility of accidental contact between the first lead-out piece 4 and the first bending portion 211 and causing a circuit short circuit, thereby improving the safety of the photovoltaic module.

[0111] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: A plurality of battery strings (1), the battery strings (1) comprising a plurality of multi-slice battery sheets (11) connected in series, bus bars (2) being arranged at both ends of the plurality of battery strings (1) to connect the plurality of battery strings (1); the bus bars (2) comprising a first bus bar (21), a second bus bar (22) and a third bus bar (23); along a first direction, the first bus bar (21), the second bus bar (22) and the third bus bar (23) are arranged at intervals, an end of the first bus bar (21) opposite to the second bus bar (22) being a first lead-out end, and an end of the second bus bar (22) opposite to the third bus bar (23) being a second lead-out end; A jumper (3), the jumper (3) being connected to the bus bar (2) and extending along a second direction, the second direction being perpendicular to the first direction; The jumper (3) comprises a first jumper (31), the first jumper (31) overlaps with the second bus bar (22), a first lead-out piece (4) is arranged on a side of the first jumper (31) away from the second bus bar (22), a first bent portion (211) is arranged on an end of the first bus bar (21) close to the second bus bar (22), and the first lead-out piece (4) and the first bent portion (211) both extend along the thickness direction of the photovoltaic module to form a first lead-out end.

2. The photovoltaic module according to claim 1, characterized in that: The first lead-out member (4) comprises a first fixing portion (41) and a first lead-out portion (42); an angle is formed between the first fixing portion (41) and the first lead-out portion (42); the first fixing portion (41) is connected to the first jumper wire (31); and the first lead-out portion (42) extends along the thickness direction of the photovoltaic module.

3. The photovoltaic module according to claim 2, characterized in that: The width of the first fixing portion (41) is greater than or equal to the width of the first jumper (31).

4. The photovoltaic module according to claim 1, characterized in that: The jumper (3) further comprises a second jumper (32), wherein the second jumper (32) is located between the second bus bar (22) and the third bus bar (23).

5. The photovoltaic module according to claim 4, characterized in that: A second bending portion (221) is provided at one end of the second bus bar (22) close to the second jumper (32), a third bending portion (231) is provided at one end of the third bus bar (23) close to the second jumper (32), the second jumper (32) includes a fourth bending portion (321), and the second bending portion (221), the third bending portion (231) and the fourth bending portion (321) are all bent along the thickness direction of the photovoltaic module to form a second lead-out end.

6. The photovoltaic module according to claim 5, characterized in that: The second jumper (32) further comprises a first straight section (322) and a second straight section (323), the first straight section (322) and the second straight section (323) both extending along the second direction, the fourth bent portion (321) being located between the first straight section (322) and the second straight section (323); the fourth bent portion (321) comprises a first bent section (321a) and a second bent section (321b), the first bent section (321a) and the second bent section (321b) both extending along the thickness direction of the photovoltaic module, and one end of each of the first bent section (321a) being connected to the first straight section (322), and the other end of the second bent section (321b) being connected to the second straight section (323).

7. The photovoltaic module according to claim 1, characterized in that: Along the thickness direction of the photovoltaic module, the jumper (3) is located on one side of the multi-slice battery sheet (11), and along the width direction of the jumper (3), the spacing between adjacent multi-slice battery sheets (11) is smaller than the width of the jumper (3); the photovoltaic module comprises an isolating member (5), and along the thickness direction of the photovoltaic module, the isolating member (5) is located between the jumper (3) and the multi-slice battery sheet (11).

8. The photovoltaic module according to claim 7, 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.

9. The photovoltaic module according to claim 7, characterized in that: The width of the isolating element (5) is 8 mm to 18 mm, and the thickness is 0.15 mm to 0.25 mm.

10. The photovoltaic module according to claim 1, characterized in that: The photovoltaic assembly comprises a first lead-out hole (6) and a second lead-out hole (7), the first lead-out end is led out through the first lead-out hole (6), the second lead-out end is led out through the second lead-out hole (7), and the cross-sectional area of ​​the first lead-out hole (6) is less than or equal to the cross-sectional area of ​​the second lead-out hole (7).

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