Solar power generation module

Abstract

The goal is to provide solar power generation modules and solve the technical problem in conventional solar power generation modules where the current of a single battery string is large, resulting in high overall power loss for the solar power generation module. [Solution] The solar power generation module includes three battery string groups connected in series, each of the three battery string groups includes four battery strings connected in parallel, each battery string includes multiple electrically connected battery cells, and each battery cell is a quarter-cut cell, where the entire battery cell has been cut. However, the length L1 of the battery cell is 182.3 mm, and the width L2 of the battery cell satisfies the condition 46.675 mm ≤ L2 ≤ 53.25 mm.

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] With the development of technology, the application range of solar power generation modules has become increasingly wide, and the power of solar power generation modules has also become increasingly high. In order to improve the output power of solar power generation modules, the size of the battery cells in solar power generation modules has gradually increased. Solar power generation modules usually use half-cell batteries, and since the current of a single battery string is large, the power loss of the entire solar power generation module is large.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In view of this, the present invention provides a solar power generation module, which is advantageous for solving the technical problem that in the solar power generation module in the prior art, the current of a single battery string is large and the power loss of the entire solar power generation module is large.

Means for Solving the Problems

[0004] An embodiment of the present invention is a solar power generation module, wherein the solar power generation module includes three battery string groups connected in series, and each of the three battery string groups includes four battery strings connected in parallel. The battery string includes a plurality of electrically connected battery cells, and the battery cell is a quarter-cut cell in which the entire battery cell is cut. The length L1 of the battery cell is 182.3 mm, and the width L2 of the battery cell satisfies 46.675 mm ≤ L2 ≤ 53.25 mm, and a solar power generation module is provided.

[0005] In this embodiment, by using quarter-cut cells, which are obtained by cutting the entire battery cell, the area of ​​the battery cell is reduced, thereby shortening the current circuit in the battery cell, reducing internal power loss in the battery cell, and improving the output power of the solar power generation module. Furthermore, compared to a 2-in-parallel, 6-in-series solar power generation module, the solar power generation module according to this embodiment employs a 4-cut, 4-in-parallel circuit design (i.e., the battery cell is a quarter-cut cell, obtained by cutting the entire battery cell, and each battery string group includes four battery strings connected in parallel), reducing the current in a single battery string and reducing power loss in a single battery string, while also avoiding a decrease in the overall output current of the solar power generation module due to the use of cut battery cells. This makes the overall output current of the solar power generation module in this embodiment equal to the overall output current of a normal solar power generation module employing half-cut cells, thereby guaranteeing the overall power of the solar power generation module in this embodiment. At the same time, the length L1 of the battery cell may be 182.3 mm, and the width L2 of the battery cell may satisfy the condition 46.675 mm ≤ L2 ≤ 53.25 mm. This ensures that the string length of the battery string formed by multiple battery cells meets the creepage distance required for the photovoltaic module, guaranteeing the normal operation of the photovoltaic module.

[0006] In one specific embodiment, the number of battery cells in each battery string is equal.

[0007] In one specific embodiment, the four battery strings in the battery string group are arranged in an array along the length and width directions of the solar power generation module.

[0008] In one specific embodiment, two adjacent battery strings along the longitudinal direction of the photovoltaic module are electrically connected via a first busbar, and the three battery string groups include a first battery string group, a second battery string group, and a third battery string group, and the photovoltaic module further includes a second busbar and a third busbar, and the first battery string group and the second battery string group are connected in series via the second busbar and the third busbar. Along the longitudinal direction of the solar power generation module, the solar power generation module further includes a fourth busbar and a fifth busbar, and both ends of the third battery string group are electrically connected to the fourth busbar and the fifth busbar, respectively, and both the fourth busbar and the fifth busbar are electrically connected to the first busbar located within the first battery string group or the second battery string group.

[0009] In one specific embodiment, a first lead wire is further provided between the second battery string group and the third battery string group, the first lead wire electrically connects the fourth busbar and the fifth busbar, and the first lead wire is further electrically connected to the first busbar located within the second battery string group.

[0010] In one specific embodiment, a second lead wire is further provided between the first battery string group and the second battery string group, the second lead wire electrically connects the second busbar and the third busbar, the photovoltaic module further includes a first bypass diode, a second bypass diode and a third bypass diode, the first battery string group is antiparallel to the first bypass diode via the second lead wire, the second battery string group is antiparallel to the second bypass diode via the second lead wire, and the third battery string group is antiparallel to the third bypass diode via the first lead wire.

[0011] In one specific embodiment, a first insulating layer is provided between the first lead wire and the battery cell, and a second insulating layer is provided between the second lead wire and the battery cell.

[0012] In one specific embodiment, the surface area of ​​the first insulating layer is larger than the surface area of ​​the first lead wire, and the surface area of ​​the second insulating layer is larger than the surface area of ​​the second lead wire.

[0013] In one specific embodiment, along the width direction of the photovoltaic module, the spacing L3 between adjacent battery strings satisfies 1.4 mm ≤ L3 ≤ 1.6 mm, and along the length direction of the photovoltaic module, there is an overlapping region between adjacent battery cells, with the length L4 of the overlapping region satisfying 0.2 mm ≤ L4 ≤ 0.4 mm.

[0014] In one specific embodiment, the photovoltaic module further includes a weld strip, the battery cells and busbars are electrically connected via the weld strip, and the weld strips in adjacent battery strings along the width direction of the photovoltaic module within the battery string group are provided on the same side of the battery cells along the thickness direction of the photovoltaic module.

[0015] It should be understood that the above general description and the detailed description below are merely illustrative and do not limit the present invention.

[0016] To more clearly explain the technical concepts of the embodiments of the present invention, the necessary drawings for the embodiments are briefly introduced below. Clearly, the drawings described below are only a few embodiments of the present invention, and those skilled in the art can obtain further drawings based on these drawings without any creative work. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic diagram of the structure in a specific embodiment of the solar power generation module according to the present invention. [Figure 2]It is a schematic structural diagram of a battery cell in FIG. 1. [Figure 3] It is a schematic structural diagram of a first battery string group in FIG. 1. [Figure 4] It is a schematic structural diagram in a specific embodiment of the circuit diagram of the photovoltaic module according to the present invention. [Figure 5] It is a cross-sectional view of FIG. 1. [Figure 6] It is a schematic structural diagram in a specific embodiment of the second lead wire and the first bus bar of FIG. 1. [Figure 7] It is a plan view of FIG. 6. [Figure 8] It is a schematic structural diagram in a specific embodiment of the second lead wire of FIG. 6. [Figure 9] It is a schematic structural diagram in another specific embodiment of the second lead wire of FIG. 6. [Figure 10] It is a schematic structural diagram in yet another specific embodiment of the second lead wire of FIG. 6. [Figure 11] It is a schematic structural diagram in a specific embodiment of the first lead wire and the first bus bar of FIG. 1. [Figure 12] It is a schematic structural diagram in another specific embodiment of the first lead wire and the first bus bar of FIG. 1.

Embodiments for Carrying Out the Invention

[0018] To better understand the technical solution of the present invention, the following will describe the embodiments of the present invention in detail with reference to the accompanying drawings.

[0019] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments that can be achieved by those skilled in the art without creative efforts belong to the protection scope 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 should be understood that the terms "and / or" used herein only describe the relationship between related objects, indicating that three types of relationships are possible. 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] Solar power modules can convert light energy into electrical energy using crystalline silicon PN junction semiconductors and are widely applied in fields such as large-scale ground power plants, rooftops, ships, and aircraft. Solar power modules contain a certain number of battery strings, which are connected in series and parallel to each other. Typical solar power modules are formed by connecting six battery strings in series to form one battery string group, and then connecting two battery string groups in parallel (i.e., 2 in parallel and 6 in series), and the battery cells in the battery strings are half-cut cells, which are formed by cutting the entire battery cell. The area of ​​the battery cells in the above solar power module is large, and the internal power loss of the battery cells is large during use, which reduces the overall power of the solar power module.

[0023] To solve the above problems, an embodiment of the present invention provides a solar power generation module 1, as shown in Figure 1. The solar power generation module 1 may include three battery string groups connected in series, each of the three battery string groups including four battery strings 14 connected in parallel, each battery string 14 including a plurality of electrically connected battery cells 15, and each battery cell 15 is a quarter-cut cell obtained by cutting an entire battery cell.

[0024] In this embodiment, by making the battery cells 15 in the solar power generation module 1 into quarter-cut cells 15 obtained by cutting the entire battery cell, the area of ​​the battery cell 15 is reduced, thereby shortening the current circuit in the battery cell 15, reducing the internal power loss of the battery cell 15, and improving the output power of the solar power generation module 1. Furthermore, compared to the above 2-in-parallel, 6-in-series solar power generation module, the solar power generation module 1 according to this embodiment employs a 4-cut, 4-in-parallel circuit design (i.e., the battery cells 15 are quarter-cut cells 15 obtained by cutting the entire battery cell, and each battery string group includes 4 battery strings 14 connected in parallel), reducing the current in a single battery string 14, reducing the power loss in a single battery string 14, and avoiding a decrease in the overall output current of the solar power generation module 1 due to the use of the cut battery cells 15. This makes the overall output current of the solar power generation module 1 in this embodiment equal to the overall output current of a normal solar power generation module employing half-cut cells, and thus guarantees the overall power of the solar power generation module 1 in the embodiment of the present invention.

[0025] In the embodiment of the present invention, the photovoltaic power generation module 1 employs a 2-in-6-series circuit design, and compared to conventional photovoltaic power generation modules, the magnitude of the current in a single battery string 14 is half that of a conventional photovoltaic power generation module. This reduces power loss in a single battery string 14 by 3 / 4 and increases the overall power of the photovoltaic power generation module 1 by at least 5W.

[0026] Here, the types of battery cells 15 in the embodiments of the present invention include, but are not limited to, those such as Passivated Emitter Rear Cells (PERC), Tunnel Oxide Passivated Contacts (TOPCON), Heterojunction with Intrinsic Thin-layer (HIT®), Back Contacts (BC), and Perovskite Solar Cells (PSC). In this embodiment, the types of battery cells in the photovoltaic power generation module 1 are not specifically limited.

[0027] In BC batteries, the emitter, surface field, and metal electrodes are all located on the back of the battery and are distributed in a cross-comb pattern, with SiN on the front of the battery cell. x / SiO x By employing a two-layer anti-reflective passivation thin film, there is no shielding by metal electrodes in front of the battery, allowing the battery cell to receive more incident light, reducing optical loss and improving photoelectric conversion efficiency.

[0028] 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.

[0029] In the case of HIT® batteries, along the thickness direction, the HIT 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.

[0030] In the case of a PERC battery, along its thickness, it contains, 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, and a metallic aluminum back electrode backside passivation layer (Al2O3 / SiNx). Instead of an all-aluminum backfield, the PERC battery uses a passivation film to passivate the back surface, enhancing internal backside reflection of light rays on the silicon base, reducing the recombination rate of the back surface, and improving the battery efficiency by 0.5% to 1%.

[0031] In the case of a PSC battery, along its thickness direction, the perovskite battery 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.

[0032] In the above embodiment, as shown in Figures 1 and 2, the length L1 of the battery cell 15 may be 182.3 mm, and the width L2 of the battery cell 15 can satisfy 46.675 mm ≤ L2 ≤ 53.25 mm. As a result, the string length of the battery string 14 formed by the multiple battery cells 15 satisfies the creepage distance required for the photovoltaic power generation module 1, and the normal operation of the photovoltaic power generation module 1 can be guaranteed.

[0033] The solar power generation module 1 may include, but is not limited to, a first-type solar power generation module 1 with a length of 2382 mm and a width of 1134 mm, or a second-type solar power generation module 1 with a length of 2278 mm and a width of 1134 mm. The specific dimensions of the battery cell 15 of the first-type solar power generation module 1 may be L1 = 182.3 mm and L2 = 53.25 mm, and the specific dimensions of the battery cell 15 of the second-type solar power generation module 1 may be L1 = 182.3 mm and L2 = 46.675 mm.

[0034] In one specific embodiment, as shown in Figures 1 and 3, two adjacent battery strings 14 along the longitudinal direction X of the photovoltaic module 1 are electrically connected via a first bus bar 16, and the three battery string groups include a first battery string group 11, a second battery string group 12, and a third battery string group 13, the photovoltaic module 1 further includes a second bus bar 17 and a third bus bar 18, the first battery string group 11 and the second battery string group 12 are connected in series via the second bus bar 17 and the third bus bar 18, the photovoltaic module 1 further includes a fourth bus bar 19 and a fifth bus bar 20 along the longitudinal direction X of the photovoltaic module 1, both ends of the third battery string group 13 are electrically connected to the fourth bus bar 19 and the fifth bus bar 20, and both the fourth bus bar 19 and the fifth bus bar 20 are electrically connected to a first bus bar 16 located within the first battery string group 11 or the second battery string group 12.

[0035] In this embodiment, by providing a second busbar 17 and a third busbar 18 at both ends of the first battery string group 11 and the second battery string group 12 along the longitudinal direction X of the solar power generation module 1, both ends of the first battery string group 11 and the second battery string group 12 are electrically connected to the second busbar 17 and the third busbar 18, respectively, thereby realizing a series connection of the first battery string group 11 and the second battery string group 12. Furthermore, the fourth busbar 19 and the fifth busbar 20 located at both ends of the third battery string group 13 along the longitudinal direction X of the solar power generation module 1 are both electrically connected to the first busbar 16 located within the first battery string group 11 or the second battery string group 12, thereby realizing a series connection of the first battery string group 11, the second battery string group 12, and the third battery string group 13.

[0036] In one specific embodiment, as shown in Figures 1 and 3, a first lead wire 21 is further provided between the second battery string group 12 and the third battery string group 13, the first lead wire 21 electrically connects the fourth bus bar 19 and the fifth bus bar 20, and the first lead wire 21 is also electrically connected to the first bus bar 16 located within the second battery string group 12.

[0037] In this embodiment, a first lead wire 21 is provided between the second battery string group 12 and the third battery string group 13, electrically connecting the fourth busbar 19 and the fifth busbar 20, and the first lead wire 21 is also electrically connected to the first busbar 16 located within the second battery string group 12. This enables a series connection between the third battery string group 13 and the second battery string group 12, and further enables a series connection between the first battery string group 11, the second battery string group 12, and the third battery string group 13.

[0038] In one specific embodiment, as shown in Figures 1 and 3, a second lead wire 22 is further provided between the first battery string group 11 and the second battery string group 12, the second lead wire 22 electrically connects the second busbar 17 and the third busbar 18, the photovoltaic module 1 further includes a first bypass diode 23, a second bypass diode 24 and a third bypass diode 25, the first battery string group 11 is antiparallel connected to the first bypass diode 23 via the second lead wire 22, the second battery string group 12 is antiparallel connected to the second bypass diode 24 via the second lead wire 22, and the third battery string group 13 is antiparallel connected to the third bypass diode 25 via the first lead wire 21.

[0039] In this embodiment, by providing a second lead wire 22 that electrically connects the second busbar 17 and the third busbar 18 between the first battery string group 11 and the second battery string group 12, the first bypass diode 23 can be connected in antiparallel to the first battery string group 11 via the second lead wire 22 (i.e., the first bypass diode 23 is connected in parallel with the first battery string group 11, but with reversed polarity). If a battery cell 15 in any of the battery strings 14 within the first battery string group 11 is shielded or fails, causing a hot spot effect (i.e., some battery cells in the solar power generation module are shielded, fragmented, etc., causing their short-circuit current to become smaller than the module's operating current, resulting in these battery cells being in a reverse-biased state and consuming energy generated in other areas), the first bypass diode 23 can form a forward bias. As a result, the current bypasses the shielded or failed battery string 14 and flows through the first bypass diode 23, without affecting the normal power generation of the other battery strings 14 within the first battery string group 11.

[0040] Furthermore, the second battery string group 12 is connected in antiparallel to the second bypass diode 24 via the second lead wire 22 (i.e., the second bypass diode 24 is connected in parallel with the second battery string group 12, but with reversed polarity). If a battery cell 15 in any of the battery strings 14 within the second battery string group 12 is shielded or fails, causing a hot spot effect, the second bypass diode 24 can form a forward bias. This allows current to bypass the shielded or failed battery string 14 and flow through the second bypass diode 24, without affecting the normal power generation of the other battery strings 14 within the second battery string group 12.

[0041] At the same time, the third battery string group 13 is connected in antiparallel to the third bypass diode 25 via the second lead wire 22 (i.e., the third bypass diode 25 is connected in parallel with the third battery string group 13, but with reversed polarity). If a battery cell 15 in any of the battery strings 14 within the third battery string group 13 is shielded or fails, causing a hot spot effect, the third bypass diode 25 can form a forward bias. This allows current to bypass the shielded or failed battery string 14 and flow through the third bypass diode 25, without affecting the normal power generation of the other battery strings 14 within the third battery string group 13.

[0042] Here, the first lead wire 21 and the second lead wire 22 may, but are not limited to, be electrically connected to the busbar by welding.

[0043] In the above embodiment, as shown in Figures 1 and 3, since the number of battery cells 15 in each battery string 14 is equal, the number of battery cells 15 in the three battery string groups is equal, and as a result the number of battery cells 15 protected by the three bypass diodes is equal, improving the operational stability of the three bypass diodes and further improving the protective effect on the solar power generation module 1 by the three bypass diodes.

[0044] In embodiments of the present invention, the first and second lead wires are typically conductors formed from conductive materials to serve as electrical connections. During the assembly process of a solar power generation module, the gaps between adjacent battery string groups are small, and the surface areas of the first and second lead wires are typically larger than the gap area between connected battery string groups. As a result, when the first or second lead wire is placed in the solar power generation module, it overlaps with the structure of some of the battery cells in the battery string, making it prone to short circuits due to direct contact between the first or second lead wire and the battery cells, which affects the normal operation of the solar power generation module.

[0045] To solve the above technical problems, as shown in Figures 1 and 3, in the embodiment of the present invention, a first insulating layer 27 may be provided between the first lead wire 21 and the battery cell 15, and a second insulating layer 28 may be provided between the second lead wire 22 and the battery cell 15. By providing the first insulating layer 27 and the second insulating layer 28, the first lead wire 21 and the battery cell 15, and the second lead wire 22 and the battery cell 15 are separated, preventing the occurrence of short circuits and improving the safety of use of the solar power generation module 1.

[0046] In this embodiment, the surface area of ​​the first insulating layer 27 is larger than the gap area between it and the adjacent battery cell 15, so that a part of the structure of the first insulating layer 27 can come into contact with the battery cell 15, thereby supporting the first insulating layer 27. Furthermore, the surface area of ​​the second insulating layer 28 is larger than the gap area between it and the adjacent battery cell 15, so that a part of the structure of the second insulating layer 28 can come into contact with the battery cell 15, thereby supporting the second insulating layer 28.

[0047] Furthermore, the surface area of ​​the first insulating layer 27 may be larger than the surface area of ​​the first lead wire 21, and the surface area of ​​the second insulating layer 28 may be larger than the surface area of ​​the second lead wire 22. By making the surface area of ​​the first insulating layer 27 larger than the surface area of ​​the first lead wire 21, the isolation effect of the first insulating layer 27 between the first lead wire 21 and the battery cell 15 can be further improved, and by making the surface area of ​​the second insulating layer 28 larger than the surface area of ​​the second lead wire 22, the isolation effect of the second insulating layer 28 between the second lead wire 22 and the battery cell 15 can be further improved, and the safety of use of the solar power generation module 1 can be significantly improved.

[0048] In each of the above embodiments, as shown in Figures 1 and 4, the spacing L3 between adjacent battery strings 14 along the width direction Y of the solar power generation module 1 satisfies 1.4 mm ≤ L3 ≤ 1.6 mm, thereby preventing cell slippage between adjacent battery strings 14 during the assembly or transportation process of the solar power generation module 1, which would cause the connected battery strings 14 to collide and be damaged. Specifically, the spacing L3 between adjacent battery strings 14 may be 1.4 mm, 1.5 mm, 1.6 mm, etc.

[0049] In each of the above embodiments, as shown in Figure 5, the width L5 of the first lead wire 21 and the second lead wire 22 along the width direction Y of the photovoltaic module satisfies 4 mm ≤ L5 ≤ 8 mm, thereby improving the overcurrent capability of the first lead wire 21 and the second lead wire 22, and avoiding the overlapping area between the first lead wire 21 and the second lead wire 22 and the battery cell 15 being too large and affecting the lamination process. The specific value of L5 may be 4 mm, 6 mm, 8 mm, etc. Furthermore, along the thickness direction Z of the photovoltaic module, the thickness L7 of the first lead wire 21 and the second lead wire 22 satisfies 0.15 mm ≤ L7 ≤ 0.4 mm, thereby avoiding the possibility that the first lead wire 21 and the second lead wire 22 will press against the battery cell 15 and damage it during the lamination process due to their excessive thickness causing them to protrude significantly from the battery cell 15. The specific value of L7 could be 0.15mm, 0.25mm, 0.4mm, etc.

[0050] Furthermore, along the width direction Y of the solar power generation module, the width L6 of the first insulating layer 27 and the second insulating layer 28 satisfies 8 mm ≤ L6 ≤ 18 mm, so that the insulating layer completely separates the lead wires and the battery cells 15, improving the safety of use of the solar power generation module. Increasing the width of the insulating layer also increases the contact area between the insulating layer and the battery cells 15, improving the mounting stability and reliability of the insulating layer. The specific value of L6 may be 8 mm, 12 mm, 15 mm, 18 mm, etc. Furthermore, along the thickness direction Z of the solar power generation module, the thickness L8 of the first insulating layer 27 and the second insulating layer 28 satisfies 0.15 mm ≤ L7 ≤ 0.25 mm, so that the effect of excessively large insulating layer thickness on the lamination process is avoided, while still meeting the required insulation performance. The specific value of L8 may be 0.15 mm, 0.20 mm, 0.25 mm, etc.

[0051] In the above embodiment, as shown in Figures 6 and 7, the first busbar 16 is further provided with a lead end 161 perpendicular to the first busbar 16, and the lead end 161 forms an L-shape with the first busbar 16. The second lead wire 22 is further provided with a lead wire 221 perpendicular to the second lead wire 22, and the first bypass diode and the second bypass diode are provided on both sides of the lead wire 221 along the width direction Y of the solar power generation module, and both are connected to the lead end 161. Here, the lead wire 221 may have three arrangement configurations as shown in Figures 8 to 10.

[0052] In the above embodiment, as shown in Figures 11 and 12, the first lead wire 21 is electrically connected to the first busbar 16 in the second battery string group to realize a series connection between the third battery string group and the second battery string group. The lead end 161 of the first busbar 16 in the second battery string group has two arrangement configurations, specifically, In the first configuration, as shown in Figure 11, the first busbar 16 and lead end 161 within the second battery string group are integrally molded, and along the thickness direction Z of the photovoltaic module, the first lead wire 21 is located on the upper surface of the first busbar 16 and abuts against the side wall of the lead end 161.

[0053] In the second configuration, as shown in Figure 12, the first busbar 16 and the lead end 161 within the second battery string group are separate structures, and the first lead wire 21 is located between the lead end 161 and the first busbar 16 along the thickness direction Z of the photovoltaic module.

[0054] In the above embodiment, the third bypass diode is electrically connected between two adjacent lead terminals 161.

[0055] Furthermore, by having an overlapping region between adjacent battery cells 15 in the battery string 14 along the length direction X of the solar power generation module 1, more battery cells 15 can be placed in the battery string 14, thereby improving the utilization efficiency of the battery string 14. Here, the length L4 of the overlapping region satisfies 0.2 mm ≤ L4 ≤ 0.4 mm, and for example, L4 may be 0.2 mm, 0.3 mm, 0.4 mm, etc. L4 must not be too large or too small. If it is too small, the overlapping region between adjacent battery cells 15 along the length direction X of the solar power generation module 1 will be too small, so it will not be possible to increase the number of battery cells 15 in the battery string 14, and the improvement in the utilization efficiency of the battery string 14 will be small. If it is too large, the overlapping region between adjacent battery cells 15 along the length direction X of the solar power generation module 1 will be too large, so the mutual shielding area between the battery cells 15 will be too large, which will result in a small improvement in the utilization efficiency of the battery string 14 and may even cause a decrease in the utilization efficiency of the battery string 14.

[0056] In the above embodiment, as shown in Figures 1 and 4, the photovoltaic module 1 further includes a weld strip 26, and the battery cells 15 and busbars are electrically connected via the weld strip 26. The weld strips 26 in adjacent battery strings 15 along the width direction Y of the photovoltaic module 1 within the battery string group are provided on the same side of the battery cells 15 along the thickness direction of the photovoltaic module 1, thereby connecting adjacent battery strings 14 along the width direction Y of the photovoltaic module 1 within the battery string group in parallel. This reduces the current in a single battery string 14, reduces power loss in a single battery string 14, and further improves the overall power of the photovoltaic module 1.

[0057] In the above embodiment, as shown in Figures 1 and 4, the four battery strings 14 in the battery string group may be arranged in an array along the length direction X and the width direction Y of the photovoltaic module 1. As a result, the plate size of the photovoltaic module 1 in the embodiment of the present invention is the same as the plate size of a normal module, thereby reducing the difficulty of production or assembly without requiring any special processes or steps when producing or assembling the photovoltaic module 1 in the embodiment of the present invention.

[0058] 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]

[0059] 1. Solar power generation module 11-First Battery String Group 12-Second Battery String Group 13-Third Battery String Group 14-Battery String 15-Battery Cell 16-1st Bus Bar 161 - End of drawer 17 - Second Bus Bar 18-3rd bus bar 19 - 4th Bus Bar 20-5th Bus Bar 21-First lead wire 22 - Second lead wire 221 - Leader wire 23-1st Bypass Diode 24-2nd bypass diode 25 - Third bypass diode 26-Welding Strips 27-First insulating layer 28-Second insulating layer

Claims

1. It is a solar power generation module, The solar power generation module (1) includes three battery string groups connected in series, and each of the three battery string groups includes four battery strings (14) connected in parallel. The battery string (14) includes a plurality of electrically connected battery cells (15), and each battery cell (15) is a quarter-cut cell (15) formed by cutting the entire battery cell (15). A solar power generation module characterized in that the length L1 of the battery cell (15) is 182.3 mm, and the width L2 of the battery cell (15) satisfies the condition 46.675 mm ≤ L2 ≤ 53.25 mm.

2. The solar power generation module according to claim 1, characterized in that the number of battery cells (15) in each of the battery strings (14) is equal.

3. The photovoltaic module according to claim 2, characterized in that the four battery strings (14) in the battery string group are arranged in an array along the length direction and the width direction of the photovoltaic module (1).

4. Two adjacent battery strings (14) along the longitudinal direction of the solar power generation module (1) are electrically connected via a first busbar (16), and the three battery string groups include a first battery string group (11), a second battery string group (12), and a third battery string group (13), and the solar power generation module (1) further includes a second busbar (17) and a third busbar (18), and the first battery string group (11) and the second battery string group (12) are connected in series via the second busbar (17) and the third busbar (18), The photovoltaic power generation module according to claim 3, wherein the photovoltaic power generation module (1) further includes a fourth busbar (19) and a fifth busbar (20) along the longitudinal direction of the photovoltaic power generation module (1), the ends of the third battery string group (13) are electrically connected to the fourth busbar (19) and the fifth busbar (20), respectively, and the fourth busbar (19) and the fifth busbar (20) are both electrically connected to the first busbar (16) located in the first battery string group (11) or the second battery string group (12).

5. The photovoltaic module according to claim 4, further comprising a first lead wire (21) between the second battery string group (12) and the third battery string group (13), wherein the first lead wire (21) electrically connects the fourth busbar (19) and the fifth busbar (20), and further electrically connects the first lead wire (21) to the first busbar (16) located within the second battery string group (12).

6. The photovoltaic module according to claim 5, further comprising a second lead wire (22) between the first battery string group (11) and the second battery string group (12), the second lead wire (22) electrically connecting the second busbar (17) and the third busbar (18), the photovoltaic module (1) further comprising a first bypass diode (23), a second bypass diode (24), and a third bypass diode (25), wherein the first battery string group (11) is antiparallel connected to the first bypass diode (23) via the second lead wire (22), the second battery string group (12) is antiparallel connected to the second bypass diode (24) via the second lead wire (22), and the third battery string group (13) is antiparallel connected to the third bypass diode (25) via the first lead wire (21).

7. The photovoltaic power generation module according to claim 6, characterized in that a first insulating layer is provided between the first lead wire (21) and the battery cell (15), and a second insulating layer is provided between the second lead wire (22) and the battery cell (15).

8. The photovoltaic power generation module according to claim 7, characterized in that the surface area of ​​the first insulating layer is larger than the surface area of ​​the first lead wire (21), and the surface area of ​​the second insulating layer is larger than the surface area of ​​the second lead wire (22).

9. The photovoltaic power generation module according to any one of claims 1 to 8, characterized in that, along the width direction of the photovoltaic power generation module (1), the spacing L3 between adjacent battery strings (14) satisfies 1.4 mm ≤ L3 ≤ 1.6 mm, and along the length direction of the photovoltaic power generation module (1), there is an overlapping region between adjacent battery cells (15), and the length L4 of the overlapping region satisfies 0.2 mm ≤ L4 ≤ 0.4 mm.

10. The photovoltaic module (1) further includes a weld strip (26), the battery cells (15) and busbars are electrically connected via the weld strip (26), and the weld strips (26) in adjacent battery strings (14) along the width direction of the photovoltaic module (1) within the battery string group are provided on the same side of the battery cells (15) along the thickness direction of the photovoltaic module (1) according to any one of claims 1 to 8.

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