Photovoltaic module and photovoltaic power generation system

Abstract

The utility model discloses a photovoltaic module and photovoltaic power generation system relates to photovoltaic power generation technical field. This photovoltaic module includes a plurality of matrix distribution's battery, along longitudinal, adjacent battery passes through the welding band series connection and constitutes the cell string, in the same cell string, the spacing L between adjacent battery satisfies: L>0.5mm. Along the transverse, adjacent cell string passes through the bus bar series connection. After all batteries are totally series connection, photovoltaic module whole output voltage is multiplied and improves, satisfies high voltage demand. The internal electrical connection structure of photovoltaic module is simple and unified, need not additional jumper and tee line to complete electrical connection, this not only reduces material and assembly cost, also reduced the quantity of connecting point, fundamentally improves system reliability, reduces the risk of poor contact or failure.

Description

Technical Field

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

[0002] In photovoltaic (PV) power generation systems, PV modules are typically configured with microinverters. The microinverter's input has one or two MPPT (Maximum Power Point Tracking) channels. Taking an existing 800W PV system as an example, it usually uses one or two 54-cell or 72-cell PV modules. The power range of a 54-cell module is between 410W and 450W, with a voltage of approximately 38V to 42V. The power range of a 72-cell module is between 580W and 610W, with a voltage of approximately 48V to 52V. These modules are usually connected to the microinverter in series or parallel to achieve system power matching.

[0003] However, in existing photovoltaic power generation systems, the parallel structure of photovoltaic modules that meet high voltage requirements is quite complex in actual installation. It usually requires the use of various transfer lines such as jumpers and T-junctions to achieve electrical connection, which not only increases the complexity of installation and material costs, but also introduces more connection point failure risks. Utility Model Content

[0004] The purpose of this invention is to provide a photovoltaic module and a photovoltaic power generation system. The photovoltaic module can meet high voltage requirements while reducing the complexity of external circuits, thereby improving the overall reliability of the photovoltaic power generation system.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A photovoltaic module comprises multiple cells arranged in a matrix, wherein...

[0007] Along the longitudinal direction, adjacent batteries are connected in series by solder strips to form a battery string. In the same battery string, the spacing L between adjacent batteries satisfies: L > 0.5 mm.

[0008] Along the lateral direction, adjacent battery strings are connected in series via busbars.

[0009] As an optional embodiment of the photovoltaic module, four solder joints are evenly distributed on the main grid line of the cell, including two edge solder joints and two middle solder joints, and the solder strip is welded to the edge solder joints.

[0010] As an alternative to the photovoltaic module, the area of ​​the edge solder joint is larger than the area of ​​the center solder joint.

[0011] As an optional embodiment of the photovoltaic module, both the edge solder joints and the center solder joints are rectangular solder joints;

[0012] The length of the edge weld is 1.1mm to 1.3mm, and the width is 0.5mm to 0.7mm;

[0013] The length of the central weld point is 0.7mm to 0.9mm, and the width is 0.46mm to 0.50mm.

[0014] As an optional embodiment of the photovoltaic module, the cell is a three-cell cell, which is made by cutting a standard cell into three equal parts to form a first part, a second part, and a third part.

[0015] When assembling the battery string, the batteries are arranged in the following ways:

[0016] Arrange them in the order of first, second, and third equal parts;

[0017] Arrange the three into equal parts.

[0018] As an alternative to the photovoltaic module, the solder strip is one of a rectangular flat solder strip, a circular solder strip, or a triangular solder strip.

[0019] As an optional solution for the photovoltaic module, every two battery strings are connected to a common bypass diode.

[0020] As an optional embodiment of the photovoltaic module, the photovoltaic module includes four battery strings connected in series, and the four battery strings are connected in series between the positive and negative terminals of the power supply through a first bus bar, a second bus bar, a third bus bar, a fourth bus bar, and a fifth bus bar.

[0021] As an optional solution for the photovoltaic module, the photovoltaic module includes a first junction box and a second junction box. The first junction box includes a first positive terminal and a first negative terminal, and the second junction box includes a second positive terminal and a second negative terminal.

[0022] The first busbar has a first bend at one end near the third busbar. The first bend extends out in a direction perpendicular to the horizontal and vertical directions to form a first lead-out end, which is connected to the first positive terminal.

[0023] The third busbar has a second bend at one end near the first busbar. The second bend extends out in a direction perpendicular to the horizontal and vertical directions to form a second lead-out end, which is connected to the first negative terminal.

[0024] The third busbar has a third bend at one end near the fifth busbar. The third bend extends out in a direction perpendicular to the transverse and longitudinal directions to form a third lead-out end, which is connected to the second positive terminal.

[0025] The fifth busbar has a fourth bend at one end near the third busbar. The fourth bend extends out in a direction perpendicular to the horizontal and vertical directions to form a fourth lead-out end, which is connected to the second negative terminal.

[0026] As an optional embodiment of the photovoltaic module, the photovoltaic module includes a junction box, which includes a positive terminal connection, a negative terminal connection, and a module connection terminal located between the positive terminal connection and the negative terminal connection;

[0027] The first busbar extends laterally to one side near the middle of the third busbar and has a fifth bend. The fifth bend extends out in a direction perpendicular to the lateral and longitudinal directions to form a fifth lead-out end, which is connected to the positive terminal.

[0028] The third busbar has a sixth bend in the middle, which extends out in a direction perpendicular to the horizontal and vertical directions to form a sixth lead-out end, which is connected to the component connection end.

[0029] The fifth busbar extends laterally to the other side near the middle of the third busbar and has a seventh bend. The seventh bend extends out in a direction perpendicular to the lateral and longitudinal directions to form a seventh lead-out end, which is connected to the negative terminal.

[0030] As an optional embodiment of the photovoltaic module, an isolation strip is provided between the extension of the first busbar and the third busbar, and between the extension of the fifth busbar and the third busbar.

[0031] A photovoltaic power generation system, which includes photovoltaic modules as described in any of the above schemes.

[0032] The beneficial effects of this utility model are:

[0033] The photovoltaic module provided by this invention features multiple cells arranged in a matrix, with adjacent cells connected in series via solder strips and a spacing L greater than 0.5 mm. This effectively alleviates thermal and mechanical stress, significantly reducing the risk of microcracks and breakage in the cells. Adjacent cell strings are connected in series via busbars, multiplying the overall output voltage of the photovoltaic module to meet high-voltage requirements. The internal electrical connection structure of the photovoltaic module is simple and standardized, eliminating the need for additional jumpers and T-connectors. This not only reduces material and assembly costs but also decreases the number of connection points, fundamentally improving system reliability and reducing the risk of poor contact or malfunction.

[0034] The photovoltaic power generation system provided by this utility model uses the aforementioned photovoltaic modules and improves the long-term operational reliability and stability of the entire photovoltaic power generation system through structural optimization of the photovoltaic modules themselves. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the arrangement of photovoltaic modules provided in a specific embodiment of this utility model;

[0036] Figure 2 This is a schematic diagram of the photovoltaic module provided in a specific embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of adjacent batteries connected by welding strips according to a specific embodiment of this utility model;

[0038] Figure 4 This is a structural schematic diagram of one arrangement of batteries in a battery string provided in a specific embodiment of this utility model;

[0039] Figure 5 This is a structural schematic diagram of the second arrangement of batteries in the battery provided in a specific embodiment of this utility model;

[0040] Figure 6 This is a structural schematic diagram of the battery arrangement method three provided in a specific embodiment of the present utility model;

[0041] Figure 7 This is a schematic diagram of the structure of a three-section battery provided in a specific embodiment of this utility model;

[0042] Figure 8 This is a schematic diagram of the structure on the main grid line of the three-cell battery provided in a specific embodiment of this utility model;

[0043] Figure 9 This is a top rear view of the upper half of the photovoltaic module provided in a specific embodiment of this utility model;

[0044] Figure 10 This is a schematic diagram of the back structure of the upper half of the photovoltaic module provided in a specific embodiment of this utility model;

[0045] Figure 11 This is a schematic diagram of the structure of the first junction box and the second junction box provided in a specific embodiment of this utility model;

[0046] Figure 12 This is a top rear view of the upper half of another photovoltaic module provided in a specific embodiment of this utility model;

[0047] Figure 13 This is a schematic diagram of the back structure of the upper half of another photovoltaic module provided in a specific embodiment of this utility model;

[0048] Figure 14 This is a schematic diagram of the junction box provided in a specific embodiment of this utility model.

[0049] In the picture:

[0050] 1. Battery; 11. First part; 12. Second part; 13. Third part;

[0051] 101. Main grid line; 1011. Edge solder joint; 1012. Center solder joint;

[0052] 2. Welding strip;

[0053] 31. First busbar; 311. First bend; 3111. First lead-out terminal; 312. Fifth bend; 3121. Fifth lead-out terminal; 32. Second busbar; 33. Third busbar; 331. Second bend; 3311. Second lead-out terminal; 332. Third bend; 3321. Third lead-out terminal; 333. Sixth bend; 3331. Sixth lead-out terminal; 34. Fourth busbar; 35. Fifth busbar; 351. Fourth bend; 3511. Fourth lead-out terminal; 352. Seventh bend; 3521. Seventh lead-out terminal;

[0054] 4. Bypass diode;

[0055] 5. Isolation strip;

[0056] 6. Junction box;

[0057] 71. First junction box; 72. Second junction box. Detailed Implementation

[0058] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0059] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0060] like Figures 1-3 As shown, this embodiment provides a photovoltaic module, including multiple cells 1 arranged in a matrix. Along the longitudinal direction, adjacent cells 1 are connected in series via solder strips 2 to form a cell string. Within the same cell string, the spacing L between adjacent cells 1 satisfies: L > 0.5 mm. Along the transverse direction, adjacent cell strings are connected in series via busbars. The connection of adjacent cells 1 via solder strips 2, with a spacing L satisfying L > 0.5 mm, effectively alleviates thermal and mechanical stress, significantly reducing the risk of microcracks and breakage of the cell 1. The connection of adjacent cell strings via busbars significantly increases the overall output voltage of the photovoltaic module, meeting high-voltage requirements. The internal electrical connection structure of the photovoltaic module is simple and uniform, requiring no additional jumpers or T-junctions to complete the electrical connection. This not only reduces material and assembly costs but also reduces the number of connection points, fundamentally improving system reliability and reducing the risk of poor contact or failure.

[0061] For example, in a photovoltaic module, there are 15 to 20 rows of cells 1 arranged longitudinally and 4 columns of cells 1 arranged laterally. That is, the photovoltaic module has four cell strings, each cell string having 15 to 20 cells 1, and the open-circuit voltage of the photovoltaic module is 42V to 60V.

[0062] Furthermore, the spacing L should not exceed 1.5mm to avoid reducing the energy density of the battery string.

[0063] In one embodiment, every two battery strings are connected to a bypass diode 4. When some batteries 1 are blocked or malfunction, the power generation capacity of that battery string decreases, and it becomes a load, consuming electrical energy and generating heat. The bypass diode 4 can automatically turn on when a reverse voltage difference is detected, providing a bypass path for the current and preventing heat from accumulating at the fault point, thereby preventing permanent damage to the battery 1 due to overheating.

[0064] By setting a reasonable ratio between bypass diode 4 and the battery string (two strings share one), the number of bypass diode 4 can be increased without excessively increasing the protection effect. This helps to balance heat dissipation and system complexity, reduce the overall failure rate, and extend the service life of photovoltaic modules.

[0065] Battery 1 is a three-cell battery, which is arranged in three-cell configurations. The three-cell battery is formed by laser cutting a standard battery into three small pieces. The output current of each small piece is also reduced to one-third of that of the standard battery, thereby reducing the current of the entire photovoltaic module to one-third of the original. According to Joule's law, the internal power loss is proportional to the square of the current. Therefore, reducing the current to one-third can reduce the conduction resistance loss to about one-ninth, thereby significantly improving the actual output efficiency of the photovoltaic module.

[0066] Although the current of each small cell decreases, its output voltage remains comparable to that of a standard cell. When all cells 1 are connected in series, the overall output voltage of the photovoltaic module increases several times, making it easier to match the higher voltage and lower current MPPT operating range of the micro-inverter, thus improving system adaptability and power transmission efficiency.

[0067] The three-cell solar panel is made by cutting a standard cell into three equal parts, forming a first part 11, a second part 12, and a third part 13. When assembling the solar panel string, the three parts are arranged in three ways: in the order of the first part 11, the second part 12, and the third part 13; or all three parts are of the same part. Specifically, the arrangement of all three parts being of the first part 11, all parts being of the second part 12, or all parts being of the third part 13. This arrangement design not only improves the utilization rate of the solar panel but also helps meet the requirements for uniform appearance of the photovoltaic module. Furthermore, by arranging the solar panel in an orderly or uniform manner, the internal current matching performance of the solar panel string can be improved, reducing series losses, thereby improving the overall output efficiency and reliability of the photovoltaic module to a certain extent.

[0068] like Figure 4 The arrangement shown is such that all three are arranged in a first division of 11, as follows: Figure 5 The arrangement shown is in the order of the first equal part 11, the second equal part 12, and the third equal part 13, as follows: Figure 6 The arrangement shown is such that all three are arranged in a second, 12-part sequence.

[0069] Continue to refer to Figure 3 In the battery string, since the size of the three-cell battery is small, adjacent cells 1 are welded together using solder ribbon 2. To prevent the cells 1 from cracking, one end of the solder ribbon 2 is placed on the upper surface of the previous cell 1 and the other end is placed on the lower surface of the next cell 1. Then, the two ends of the solder ribbon 2 are welded to the solder joints of the two cells 1 respectively.

[0070] In one embodiment, the solder strip 2 is one of a rectangular flat solder strip, a circular solder strip, or a triangular solder strip. When using a rectangular flat solder strip, both ends of the rectangular flat solder strip can be directly connected to the two batteries 1 respectively. When using a circular or triangular solder strip, because the circular and triangular solder strips are thicker, they need to be flattened before welding.

[0071] In one embodiment, such as Figure 7 and Figure 8 As shown, four solder joints are evenly distributed on the main grid line 101 of the battery, including two edge solder joints 1011 and two middle solder joints 1012. The solder strip 2 is soldered to the edge solder joints 1011. The area of ​​the edge solder joints 1011 is larger than that of the middle solder joints 1012. This structural design helps to improve the end current collection capability, enhance the current transmission uniformity, thereby improving the electrical performance consistency between batteries 1, and improving the efficiency and output voltage stability of the entire battery string 1.

[0072] Furthermore, when arranging the three-cell solar panels into strings, it is essential to ensure that the edges of each segment are strictly aligned, and that all solder joints remain aligned laterally. This alignment method helps reduce electrical deviations and solder misalignments within the cell string, minimizes interconnection losses, and improves the neatness and reliability of the photovoltaic module's mechanical structure.

[0073] For example, such as Figure 7 and Figure 8 As shown, each section includes 16 main grid lines 101, and each main grid line 101 has 4 solder points. After the three sections are arranged in a certain way, there are a total of 12 solder points along the longitudinal direction.

[0074] In one embodiment, both the edge solder joint 1011 and the middle solder joint 1012 are rectangular solder joints; the length of the edge solder joint 1011 is 1.1mm to 1.3mm and the width is 0.5mm to 0.7mm; the length of the middle solder joint 1012 is 0.7mm to 0.9mm and the width is 0.46mm to 0.50mm.

[0075] The edge solder joint 1011 has a larger area, providing a greater welding contact area compared to the central solder joint 1012. During cell series connection, the welding of the solder strip 2 to the edge solder joint 1011 needs to withstand higher mechanical stress and electrical loads, such as vibration, thermal expansion, or external impact. The larger welding area helps to disperse these stresses, reducing the risk of solder joint cracking or incomplete soldering, thereby improving the long-term reliability of the connection. Series connections typically involve large current transmission; the increased area of ​​the edge solder joint 1011 can reduce contact resistance, reduce energy loss, avoid localized overheating, and contribute to improving the overall efficiency and safety of the photovoltaic module, preventing circuit interruptions due to solder joint failure.

[0076] By reducing the size of the central solder joint 1012, valuable space on the battery surface can be saved, leaving more space for other components and thus increasing the battery's energy density.

[0077] The size variation of the rectangular solder joints allows for customization according to location requirements. The edge solder joints 1011 focus on high-strength connections, while the center solder joints 1012 achieve a compact layout, realizing the compactness and lightweighting of photovoltaic modules.

[0078] For example, the dimensions of the edge solder joint 1011 are 1.2mm × 0.6mm, and the dimensions of the middle solder joint 1012 are 0.8mm × 0.48mm.

[0079] In one embodiment, continue to refer to Figure 2 As shown, the four battery strings are connected in series between the positive and negative terminals of the power supply via the first busbar 31, the second busbar 32, the third busbar 33, the fourth busbar 34, and the fifth busbar 35.

[0080] Specifically, the four battery strings are the first battery string, the second battery string, the third battery string, and the fourth battery string. One end of the first battery string is connected to the positive terminal of the power supply through the first bus bar 31, and the other end of the first battery string is connected in series with the second battery string through the second bus bar 32. The second battery string is connected in series with the third battery string through the third bus bar 33, the third battery string is connected in series with the fourth battery string through the fourth bus bar 34, and the fourth battery string is connected to the negative terminal of the power supply through the fifth bus bar 35.

[0081] Series connection allows the voltage of each battery string to be superimposed, and the total voltage is the sum of the voltages of the four battery strings, which meets the high voltage requirements and reduces energy loss in current transmission.

[0082] Using busbars for connections, which are typically made of highly conductive materials such as copper or aluminum, offers low resistance and high current carrying capacity. This reduces contact resistance and power loss at connection points, improving energy transfer efficiency.

[0083] In one embodiment, such as Figures 9-11As shown, the photovoltaic module includes a first junction box 71 and a second junction box 72. The first junction box 71 includes a first positive terminal and a first negative terminal, and the second junction box 72 includes a second positive terminal and a second negative terminal. A first bend 311 is provided at one end of the first busbar 31 near the third busbar 33. The first bend 311 extends out in a direction perpendicular to both the horizontal and vertical directions, forming a first lead-out terminal 3111, which is connected to the first positive terminal. A second bend 331 is provided at one end of the third busbar 33 near the first busbar 31. The second bend 331 extends out in a direction perpendicular to both the horizontal and vertical directions, forming a second lead-out terminal 3311, which is connected to the first negative terminal. The third busbar 33 has a third bend 332 at one end near the fifth busbar 35. The third bend 332 extends out in a direction perpendicular to the horizontal and vertical directions to form a third lead-out end 3321, which is connected to the second positive terminal. The fifth busbar 35 has a fourth bend 351 at one end near the third busbar 33. The fourth bend 351 extends out in a direction perpendicular to the horizontal and vertical directions to form a fourth lead-out end 3511, which is connected to the second negative terminal.

[0084] The photovoltaic module has a first junction box 71 and a second junction box 72, which are respectively arranged in appropriate positions on the photovoltaic module. The internal busbar of the photovoltaic module extends by bending to form a first lead-out terminal 3111, a second lead-out terminal 3311, a third lead-out terminal 3321, and a fourth lead-out terminal 3511. The first lead-out terminal 3111 and the second lead-out terminal 3311 are connected to the first junction box 71, and the third lead-out terminal 3321 and the fourth lead-out terminal 3511 are connected to the second junction box 72. The first junction box 71 and the second junction box 72 are independent of each other and can be connected to an external system to achieve parallel output of the photovoltaic module.

[0085] The design of the first junction box 71 and the second junction box 72 provides each photovoltaic module with two independent external electrical interfaces, significantly simplifying the wiring complexity when multiple photovoltaic modules are connected in parallel. Users can directly connect the modules in parallel through the first junction box 71 and the second junction box 72 without the need for additional jumpers or adapter lines, which improves the flexibility and modularity of system integration. The parallel current output through the first junction box 71 and the second junction box 72 reduces the current carrying capacity of a single output path, minimizes transmission losses and the risk of localized overheating, and helps improve the long-term reliability and efficiency of the modules.

[0086] In one embodiment, such as Figures 12-14As shown, the photovoltaic module includes a junction box 6, which includes a positive terminal, a negative terminal, and a module connection terminal located between the positive and negative terminals. A first busbar 31 extends laterally to one side near the middle of the third busbar 33 and has a fifth bend 312. The fifth bend 312 extends outward in a direction perpendicular to both the lateral and longitudinal directions, forming a fifth lead-out end 3121, which connects to the positive terminal. A sixth bend 333 is located in the middle of the third busbar 33. The sixth bend 333 extends outward in a direction perpendicular to both the lateral and longitudinal directions, forming a sixth lead-out end 3331, which connects to the module connection terminal. The fifth busbar 35 extends laterally to the other side near the middle of the third busbar 33 and is provided with a seventh bend 352. The seventh bend 352 extends out in a direction perpendicular to the lateral and longitudinal directions to form a seventh lead-out end 3521, which is connected to the negative terminal connection end.

[0087] The junction box 6 is an integrated junction box. The integrated junction box can be directly connected in parallel with the external system through the fifth lead 3121, the sixth lead 3331 and the seventh lead 3521. Parallel connection can be achieved without external conversion lines, which simplifies system integration and electrical connection.

[0088] In one embodiment, an isolation strip 5 is provided between the extension of the first busbar 31 and the third busbar 33, and between the extension of the fifth busbar 35 and the third busbar 33. Placing the isolation strip 5 at locations where there is a risk of crossover effectively prevents electrical contact between adjacent busbars and avoids potential short-circuit risks.

[0089] Furthermore, isolation strips 5 can also be provided at the positions where the first bend 311, the second bend 331, the third bend 332, and the fourth bend 351 contact the battery 1 to serve as isolation and insulation.

[0090] For example, the insulating strip 5 is typically made of EVA (Ethylene-Vinyl Acetate Copolymer) or EPE (Expandable Polyethylene). EVA and EPE are polymeric materials with excellent insulation, weather resistance, and elasticity, which ensure that electrical clearances and creepage distances meet safety standards through physical isolation, preventing short circuits.

[0091] This embodiment also provides a photovoltaic power generation system, including the aforementioned photovoltaic module. This photovoltaic module employs a three-cell battery and a specific electrical layout, resulting in an increased output voltage and significantly reduced operating current. This output characteristic allows for better matching with the maximum power point tracking (MPPT) voltage and current window of the micro-inverter, reducing impedance mismatch losses and enabling the micro-inverter to operate in its high-efficiency range for longer periods, thereby improving the overall power transmission efficiency of the photovoltaic power generation system. The photovoltaic module internally uses a simple topology where the solder strip 2 directly connects to the busbar, greatly reducing the number of additional cables, connectors, and adapters required in traditional parallel solutions. Minimizing the number of connection points directly reduces the probability of failures caused by poor contact, oxidation, or loosening, thereby improving the long-term operational reliability and stability of the entire photovoltaic power generation system.

[0092] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A photovoltaic module, comprising a plurality of cells (1) arranged in a matrix, characterized in that, in the longitudinal direction, adjacent cells (1) are connected in series by a ribbon (2) to form a cell string, and the distance L between adjacent cells (1) in the same cell string satisfies L>0.5mm; in the transverse direction, adjacent cell strings are connected in series by a busbar.

2. The photovoltaic module of claim 1, wherein, The main grid line (101) of the cell (1) is provided with four soldering points, including two edge soldering points (1011) and two middle soldering points (1012), and the ribbon (2) is soldered to the edge soldering points (1011).

3. The photovoltaic module of claim 2, wherein, The area of the edge soldering point (1011) is larger than that of the middle soldering point (1012).

4. The photovoltaic module of claim 3, wherein, The edge soldering point (1011) and the middle soldering point (1012) are both rectangular soldering points. The length of the edge soldering point (1011) is 1.1mm-1.3mm, and the width is 0.5mm-0.7mm. The length of the middle soldering point (1012) is 0.7mm-0.9mm, and the width is 0.46mm-0.50mm.

5. The photovoltaic module of claim 1, wherein, The cell (1) is a three-piece cell, which is made by cutting a standard cell into three equal parts to form a first piece (11), a second piece (12) and a third piece (13). In the arrangement of the cell string, the arrangement of the cell (1) includes: arranging in the order of the first piece (11), the second piece (12) and the third piece (13); arranging in the order of the first piece (11), the second piece (12) and a third piece (13).

6. The photovoltaic module of claim 1, wherein, The ribbon (2) is one of a rectangular flat ribbon, a circular ribbon or a triangular ribbon.

7. The photovoltaic module of claim 1, wherein, Every two cell strings are commonly connected with a bypass diode (4).

8. The photovoltaic module of claim 1, wherein, The photovoltaic module comprises four cell strings connected in series, and the four cell strings are connected in series between the positive and negative electrodes of the power source through a first busbar (31), a second busbar (32), a third busbar (33), a fourth busbar (34) and a fifth busbar (35) in turn.

9. The photovoltaic module of claim 8, wherein, The photovoltaic module comprises a first junction box (71) and a second junction box (72), the first junction box (71) comprises a first positive connection end and a first negative connection end, and the second junction box (72) comprises a second positive connection end and a second negative connection end; The first busbar (31) is provided with a first bending part (311) at one end close to the third busbar (33), the first bending part (311) is led out in a direction perpendicular to the transverse direction and the longitudinal direction to form a first leading end (3111), and the first leading end (3111) is connected with the first positive connection end; The third busbar (33) is provided with a second bending part (331) at one end close to the first busbar (31), the second bending part (331) is led out in a direction perpendicular to the transverse direction and the longitudinal direction to form the second leading end (3311), and the second leading end (3311) is connected with the first negative connection end; The third bus bar (33) is provided with a third bending part (332) near one end of the fifth bus bar (35), the third bending part (332) is led out along a direction perpendicular to the transverse direction and the longitudinal direction, forming a third leading end (3321), the third leading end (3321) is connected with the second positive electrode connecting end; The fifth bus bar (35) is provided with a fourth bending part (351) near one end of the third bus bar (33), the fourth bending part (351) is led out along a direction perpendicular to the transverse direction and the longitudinal direction, forming a fourth leading end (3511), the fourth leading end (3511) is connected with the second negative electrode connecting end.

10. The photovoltaic module of claim 8, wherein, The photovoltaic module comprises a junction box (6), the junction box (6) comprises a positive electrode connecting end, a negative electrode connecting end and a module connecting end between the positive electrode connecting end and the negative electrode connecting end; The first bus bar (31) extends along the transverse direction to one side near the middle of the third bus bar (33) and is provided with a fifth bending part (312), the fifth bending part (312) is led out along a direction perpendicular to the transverse direction and the longitudinal direction, forming a fifth leading end (3121), the fifth leading end (3121) is connected with the positive electrode connecting end; The middle of the third bus bar (33) is provided with a sixth bending part (333), the sixth bending part (333) is led out along a direction perpendicular to the transverse direction and the longitudinal direction, forming a sixth leading end (3331), the sixth leading end (3331) is connected with the module connecting end; The fifth bus bar (35) extends along the transverse direction to the other side near the middle of the third bus bar (33) and is provided with a seventh bending part (352), the seventh bending part (352) is led out along a direction perpendicular to the transverse direction and the longitudinal direction, forming a seventh leading end (3521), the seventh leading end (3521) is connected with the negative electrode connecting end.

11. The photovoltaic module of claim 10, wherein, The extension of the first bus bar (31) and the third bus bar (33) and the extension of the fifth bus bar (35) and the third bus bar (33) are both provided with a separation strip (5).

12. A photovoltaic power system, characterized by, The photovoltaic module comprises a junction box (6), the junction box (6) comprises a positive electrode connecting end, a negative electrode connecting end and a module connecting end between the positive electrode connecting end and the negative electrode connecting end; The photovoltaic module comprises a junction box (6), the junction box (6) comprises a positive electrode connecting end, a negative electrode connecting end and a module connecting end between the positive electrode connecting end and the negative electrode connecting end;

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