A multi-faceted photovoltaic assembly and photovoltaic system

Abstract

This invention discloses a multi-segment photovoltaic module and a photovoltaic system. The multi-segment photovoltaic module includes: multiple solar cells, each solar cell being a four-segment solar cell cut along its length from a single solar cell; the multiple solar cells are arranged into multiple solar cell strings; the circuit connection structure of the multiple solar cell strings includes at least one parallel unit, each parallel unit including four solar cell strings connected in parallel; the photovoltaic module includes: a positive output terminal and a negative output terminal, the circuit connection structure being a positive-negative circuit structure where the circuit path from the positive output terminal to the negative output terminal contains only one main positive path and one main negative path; the circuit connection structure also includes: jumpers and crossover wires; the photovoltaic module also includes: busbars, the busbars being used to connect the solder strips of the solar cells, wherein at least a portion of the busbars is a hollow structure. This invention simplifies the production process, reduces the production cost of photovoltaic modules, and improves reliability.

Description

Technical Field

[0001] This invention relates to the field of solar cell technology, and more particularly to a multi-segment photovoltaic module and photovoltaic system. Background Technology

[0002] With the development of photovoltaic technology, the mainstream silicon wafer size has increased to M12, and the short-circuit current of a single cell can reach 18-20A. This higher current leads to increased internal heat generation in photovoltaic modules, increasing power loss and the risk of hot spots. To reduce internal power loss caused by high current and improve the overall output power and reliability of the modules, multi-cell module technology has become the mainstream development direction.

[0003] In existing technologies, leading manufacturers mostly adopt a six-series, two-positive, four-negative circuit design with jumpers. For example, a typical four-piece board design uses a four-parallel, three-series scheme, with a six-series, two-positive, four-negative circuit. This design has the following drawbacks: First, manual string placement requires careful identification of positive and negative terminals, resulting in low production efficiency; second, it requires two long jumpers (slightly shorter than the glass edge length) to connect the current, which increases the risk of lamination microcracks, and the jumpers are soldered inside the junction box, so poor soldering can cause black spots on the entire component; third, this design often uses two separate junction boxes, which are incompatible with conventional production lines, requiring modification of the junction box soldering machine, increasing production costs. Summary of the Invention

[0004] This invention provides a multi-segment photovoltaic module and photovoltaic system to solve the problems of low production efficiency and high cost, low reliability caused by lamination microcracks and short circuit risks in existing photovoltaic modules.

[0005] According to one aspect of the present invention, a multi-cell photovoltaic module is provided, the multi-cell photovoltaic module comprising: Multiple battery cells, each of which is a quarter-cell battery cell cut along the length of a whole battery cell, and the multiple battery cells are arranged into multiple battery strings; The circuit connection structure of the plurality of battery strings includes at least one parallel unit, and each of the parallel units includes four battery strings connected in parallel. Inside each of the battery strings, multiple battery cells are connected in series; The photovoltaic module includes a positive output terminal and a negative output terminal, and the circuit connection structure is a positive-negative circuit structure in which the circuit path from the positive output terminal to the negative output terminal contains only one positive main path and one negative main path. The circuit connection structure also includes: a jumper wire and a jumper wire. The jumper wire is used to connect the battery cells in different battery strings within the same parallel unit to achieve series connection. The jumper wire is used to connect different battery strings within the same parallel unit or to connect a diode in parallel into the circuit. The photovoltaic module further includes: a busbar for connecting the solder strips of the solar cells, wherein at least a portion of the busbar is a hollow structure.

[0006] Optionally, the positive and negative circuit structure is as follows: all positive connection points are connected to the same positive main bus bar, and all negative connection points are connected to the same negative main bus bar.

[0007] Optionally, the plurality of battery strings includes: a first battery string, a second battery string, a third battery string, and a fourth battery string arranged sequentially along the width direction of the photovoltaic module; The crossover connects the cells in the second battery string and the third battery string, so that the cells in the second battery string and the third battery string are connected in series.

[0008] Optionally, the jumper wire is a short jumper wire, the length of which is less than the side length of the photovoltaic module.

[0009] Optionally, the busbar with the hollow structure includes two opposing long sides and one short side, the two long sides being used to connect the solder strips, and the short side being used to transmit current.

[0010] Optionally, the solar cells are cut along the long side of the photovoltaic module; The plurality of battery strings are arranged along the width direction of the photovoltaic module, and the jumper wires are arranged along the arrangement direction of the battery cells.

[0011] Optionally, the photovoltaic module further includes an insulating strip, through which the jumper wire is insulated from the solar cell.

[0012] Optionally, the busbar includes a side busbar disposed on the side of the photovoltaic module, the side busbar being foldable to the back of the solar cell.

[0013] Optionally, the length of the solar cell is 182.2mm-182.3mm, and the width of the solar cell is 45.937mm-52.5mm; The photovoltaic module has a cell spacing of 0.5mm-0.8mm and a string spacing of 1.5mm-1.8mm. The width of the hollow busbar is 4mm-6mm, and the thickness of the hollow busbar is 0.25mm-0.4mm. The jumper wire has a width of 6mm-10mm and a thickness of 0.15-0.25mm.

[0014] According to another aspect of the present invention, a photovoltaic system is provided, comprising a multi-segmented photovoltaic module as described in any one of the preceding aspects.

[0015] The technical solution of this invention, by adopting the same positive and negative circuit design as half-cell modules, has a foolproof effect, good compatibility with conventional production lines, requires no equipment modification, and eliminates the need for careful identification of positive and negative terminals during manual or equipment stringing, thus accelerating the production cycle. The use of hollow busbars reduces material usage while ensuring current transmission, saving costs. The use of quarter-cell cells reduces the current per cell to only 1 / 4 of that of the entire module, significantly lowering hot spot temperature, reducing localized hot spots, and lowering the overall probability of hot spots, thereby improving the long-term reliability of the module. In summary, this invention solves the problems of low production efficiency and high cost, as well as low reliability due to lamination cracks and short-circuit risks in existing photovoltaic modules, achieving the effects of simplifying the production process, reducing the production cost of photovoltaic modules, and improving reliability.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an internal circuit diagram of a multi-segment photovoltaic module according to an embodiment of the present invention; Figure 2 This is a circuit diagram of a multi-segment photovoltaic module structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the positive electrode to positive electrode connection of a cell in a multi-segmented photovoltaic module according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the negative electrode to negative electrode connection of a cell in a multi-segmented photovoltaic module according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the connection point or cross-line between the negative and positive electrodes of a cell in a multi-segmented photovoltaic module according to an embodiment of the present invention. Figure 6 This is a second pattern drawing of a multi-segment photovoltaic module according to an embodiment of the present invention; Figure 7This is a current trend diagram of a multi-segment photovoltaic module provided according to an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Figure 1 This is an internal circuit diagram of a multi-segment photovoltaic module according to an embodiment of the present invention, with reference to... Figure 1 The present invention provides a multi-cell photovoltaic module, which includes: Multiple battery cells 11, each battery cell 11 is a quarter-cell battery cell formed by cutting a whole battery along the length direction, and multiple battery cells 11 are arranged into multiple battery strings; The circuit connection structure of multiple battery strings includes at least one parallel unit 100, and each parallel unit 100 includes four battery strings (10-40) connected in parallel. Inside each battery string, multiple battery cells 11 are connected in series; Photovoltaic modules include: a positive output terminal + and a negative output terminal -. The circuit connection structure is a positive-negative circuit structure in which the circuit path from the positive output terminal + to the negative output terminal - contains only one positive main path and one negative main path. The circuit connection structure also includes: a jumper wire 22 and a jumper wire 33. The jumper wire 22 is used to connect the battery cells 11 in different battery strings within the same parallel unit 100 to achieve series connection. The jumper wire 33 is used to connect different battery strings within the same parallel unit or to connect diodes in parallel into the circuit. The photovoltaic module also includes: busbars 44, which are used to connect the solder strips of the solar cells 11, wherein at least a portion of the busbars 44 is a hollow structure.

[0022] Specifically, quarter-cell cells are created by cutting a single cell along its length (i.e., the long side of the module). This reduces the current to 1 / 4 of the total current of the entire module, thereby reducing power loss caused by current.

[0023] Designed based on a half-chip circuit, it adopts the same one-positive-one-negative circuit as the half-chip circuit, unlike competing products which typically have four positive and two negative terminals. This design facilitates manual or machine-based string arrangement. Distinguishing itself from competitors' two-positive-four-negative circuits, the use of the same one-positive-one-negative circuit as the half-chip module makes string arrangement easier and faster. The foolproof design circuit is consistent with the conventional one-positive-one-negative circuit of half-chip circuits, further accelerating the process cycle.

[0024] Figure 1 The diagram shows a first battery string 10, a second battery string 20, a third battery string 30, and a fourth battery string 40 arranged sequentially along the width of the photovoltaic module. The photovoltaic module has a four-parallel structure internally, with each battery string connected in series. The parallel connection of the four battery strings satisfies the current requirement, while the series connection within each battery string satisfies the voltage requirement. A crossover wire 22 is added to connect the second battery string 20 and the third battery string 30 in series, thus connecting the internal circuitry in series.

[0025] Three short jumpers (33) are connected together, and the shorter jumpers reduce the risk of microcracks in the lamination. Furthermore, jumper (33) carries current and connects a diode in parallel within the circuit; the diode is used for circuit protection. The jumpers are shorter than those of competing products, making it less likely to cause microcracks or breakage of the solar cells, and the cost is lower.

[0026] The electrodes of the solar cell 11 are connected by busbars 44, which are hollow in structure and are placed on the back of the solar cell 11. The base material of the busbars 44 is mostly tin-plated copper strip (copper base material + tin plating layer). An annealing process is used to reduce the hardness of the cold-rolled copper strip and improve its plasticity and toughness while ensuring that the edges do not crack or the tin does not fall off. The surface of the busbars 44 is softer and easier to bend. In this embodiment, the busbars 44 are hollow in structure. The two long sides of the hollow busbar are used to connect the solder strip, and the current is transmitted through the short side.

[0027] The manufacturing method of multi-cell photovoltaic modules is as follows: A single cell is cut into four sectional cells along its length; multiple sectional cells are connected in series and welded together according to the spacing between the cells to form a cell string; the modules are arranged according to a positive and negative circuit diagram, which has a positive and negative circuit structure with only one main positive path and one main negative path from the positive output terminal to the negative output terminal; the solder strips of the cells are connected using busbars, wherein hollow busbars are used at internal connections, and side busbars are folded to the back of the cells; jumpers and crossover wires are set at preset designated positions to form parallel units and complete circuit connections. Jumpers are used to connect different cell strings within the same parallel unit or to connect diodes in parallel into the circuit; the arranged and connected photovoltaic modules are laminated; finally, the frame and junction box are installed to ensure the integrity of the EL image.

[0028] Compared to existing competing products (quad-cell modules using two positive and four negative circuits + long jumpers + two separate junction boxes), the multi-cell photovoltaic modules in this embodiment have the following advantages: They employ a one-positive-one-negative error-proof circuit design, eliminating the need for careful polarity identification during string arrangement and resulting in a faster manufacturing cycle. The use of short jumpers significantly reduces the risk of lamination microcracks compared to competing products using long jumpers. The hollow busbar structure reduces material usage and is compatible with conventional half-cell production lines, eliminating the need to modify the junction box welding machine. The current of the quad-cell cells is only 1 / 4 that of the full-cell cells, resulting in lower hotspot temperatures, more uniform heat distribution, and less damage to the module structure.

[0029] The technical solution of this invention, by adopting the same positive and negative circuit design as half-cell modules, has a foolproof effect, good compatibility with conventional production lines, requires no equipment modification, and eliminates the need for careful identification of positive and negative terminals during manual or equipment stringing, thus accelerating the production cycle. The use of hollow busbars reduces material usage while ensuring current transmission, saving costs. The use of quarter-cell cells reduces the current per cell to only 1 / 4 of that of the entire module, significantly lowering hot spot temperature, reducing localized hot spots, and lowering the overall probability of hot spots, thereby improving the long-term reliability of the module. In summary, this invention solves the problems of low production efficiency and high cost, as well as low reliability due to lamination cracks and short-circuit risks in existing photovoltaic modules, achieving the effects of simplifying the production process, reducing the production cost of photovoltaic modules, and improving reliability.

[0030] Optionally, the positive and negative circuit structure is as follows: all positive connection points are connected to the same positive main bus bar, and all negative connection points are connected to the same negative main bus bar.

[0031] Specifically, all positive connection points converge to a single positive main busbar, and all negative connection points converge to a single negative main busbar, resulting in an extremely simple structure. This circuit structure is consistent with conventional half-chip modules, facilitating string production. It avoids uneven current distribution across multiple branches, reducing the risk of poor contact and open circuits; the wiring is neat and tidy, facilitating automated production and quality inspection.

[0032] Continue to refer to Figure 1 Optionally, the multiple battery strings include: a first battery string 10, a second battery string 20, a third battery string 30 and a fourth battery string 40 arranged sequentially along the width direction of the photovoltaic module; The cross wire 22 connects the battery cells 11 in the second battery string 20 and the third battery string 30, so that the battery cells 11 in the second battery string 20 and the third battery string 30 are connected in series.

[0033] Specifically, the circuit adopts a positive and negative structure, with four battery strings forming a parallel unit. The cross wire 22 connects the second battery string 20 and the third battery string 30 to realize the series connection of the internal battery cells 11, resulting in an optimal circuit path. The battery string layout is symmetrical, the current distribution is uniform, and the risk of local heat generation and aging is reduced. The external wiring method is not changed, and it is compatible with conventional junction boxes.

[0034] Continue to refer to Figure 1 Optionally, jumper 33 is a short jumper, the length of which is less than the side length of the photovoltaic module.

[0035] Specifically, Figure 1 The diagram shows a first jumper wire 33 positioned above the second battery string 20 and the third battery string 30, with its first end connected to the beginning of the second battery string 20 above it and its second end connected to the end of the third battery string 30 above it. A second jumper wire 33 is positioned below the second battery string 20 and the third battery string 30, with its first end connected to the beginning of the second battery string 20 below it and its second end connected to the end of the third battery string 30 below it. A third jumper wire 33 is connected between the midpoint of the first jumper wire 33 and the midpoint of the second jumper wire 33.

[0036] The third jumper wire 33 transmits current and connects the diode in parallel in the circuit, protecting the circuit. Jumper wire 33 is shorter than competing products, making it less likely to cause microcracks or breakage of the solar cells, and it is also less expensive. Jumper wire 33 is a short jumper wire, much shorter than the side length of the photovoltaic module, which significantly reduces the probability of lamination microcracks, breakage, and short circuits; it also reduces the amount of insulating film tape used, simplifies the lamination process, and improves production efficiency; the shorter jumper wire 33 has fewer solder points, reducing the probability of black cells caused by poor soldering.

[0037] This invention employs a short jumper wire design. Compared to the long jumper wires in the prior art, which are almost as long as the glass edge, the jumper wires of this invention are shorter, significantly reducing the risk of microcracks or breakage of the battery cells during the lamination process, while also reducing material costs.

[0038] Optionally, the solar cells are cut along the long side of the photovoltaic module; Multiple battery strings are arranged along the width of the photovoltaic module, and jumpers are set along the arrangement direction of the battery cells.

[0039] Specifically, the solar cells are cut into quarters along the long side of the module, reducing the current to 1 / 4 of the total current of the module, thereby reducing power loss caused by current. Cutting into quarters along the long side optimizes current distribution and maximizes hot spot suppression. The cell strings are arranged along the width direction, and the jumpers are set along the cell arrangement direction, resulting in a compact layout and stable insulation distance. The design is adaptable to various modules, offering strong versatility.

[0040] Figure 2 This is a circuit diagram of a multi-segment photovoltaic module structure according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the positive electrode-to-positive electrode connection of a solar cell in a multi-segmented photovoltaic module according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the negative electrode-to-negative electrode connection of a cell in a multi-segmented photovoltaic module according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the connection point or cross-line between the negative and positive electrodes of a cell in a multi-cell photovoltaic module according to an embodiment of the present invention. (Refer to...) Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 3 yes Figure 2 A magnified view of a portion of position 1. Figure 4 yes Figure 2 A magnified view of a portion of position 3 in the middle. Figure 5 yes Figure 2 A magnified view of a portion of position 2 in the middle.

[0041] The photovoltaic modules are stacked in series with a specific spacing between cells, arranged according to a positive and negative circuit and layout diagram. The side busbars on both sides of the modules can be folded onto the back of the cells. Hollow-structure busbars can be used internally for connection, with positive terminals connected to positive terminals (corresponding to...). Figure 3 ), negative electrode to negative electrode (corresponding) Figure 4 ), from negative to positive and at the crossing point (corresponding to Figure 5 The welding wires leading from the front of cell 11 are welded to the busbar with an insulating pad underneath. The welding wires leading from the back of cell 11 are directly welded to the busbar. Longer integrated busbars are required at the connection between the negative and positive electrodes and at the crossover points. The welding temperature is 350-380°C. The stacked modules are laminated while ensuring the integrity of the EL (electrode electrode), and finally the frame and junction box are installed.

[0042] Continue to refer to Figure 3 and Figure 5 Optionally, the hollow busbar 44 includes two opposing long sides and one short side, the two long sides being used to connect the welding strip 66, and the short side being used to transmit current.

[0043] Specifically, the cross-line, the connection between the negative and positive electrodes of the battery cell 11, and the connection between two identical electrodes are all connected by a hollow busbar 44 that can be used in actual production, reducing material usage. The hollow busbar 44 has a welded strip 66 on its two long sides and conducts current on its short sides, resulting in an efficient conductive path and sufficient contact area. The hollow structure reduces copper consumption by 15%–30% while ensuring mechanical and conductive properties. It is also softer, making it easier to fold and attach to the back of the battery cell, reducing the risk of microcracks.

[0044] Continue to refer to Figure 1 , Figure 3 and Figure 5 Optionally, the photovoltaic module also includes an insulating strip 55, through which the jumper wire 33 is insulated from the solar cell 11.

[0045] Specifically, to transmit current, jumper 33 and crossover 22 are added. An insulating pad 55 must be added when soldering jumper 33. An insulating pad 55 is placed under jumper 33 to isolate the battery cell 11 and prevent short circuits. Jumper 33 is isolated from the battery cell 11 by the insulating pad 55, completely avoiding the risk of short circuits and arcing; the insulating pad 55 is reliably positioned, does not shift during lamination, and improves long-term reliability; it is suitable for automated installation, with simple procedures and high consistency.

[0046] Optionally, the length of the solar cell is 182.2mm-182.3mm, and the width of the solar cell is 45.937mm-52.5mm; The cell spacing of photovoltaic modules is 0.5mm-0.8mm, and the string spacing of photovoltaic modules is 1.5mm-1.8mm; The width of the hollow busbar is 4mm-6mm, and the thickness of the hollow busbar is 0.25mm-0.4mm; The width of the jumper wire is 6mm-10mm, and the thickness of the jumper wire is 0.15-0.25mm.

[0047] Specifically, the length L1 of the solar cell can be 182.2 mm, and the width L2 of the solar cell can satisfy 45.937 mm ≤ L2 ≤ 52.5 mm, so that the string length of the solar cell string formed by multiple solar cells can meet the creepage distance and output power requirements of the photovoltaic module, ensuring the normal use of the photovoltaic module. The photovoltaic module can include, but is not limited to, a first-type photovoltaic module with a length of 2382 mm and a width of 1134 mm, or a second-type photovoltaic module with a length of 2278 mm and a width of 1134 mm. The specific dimensions of the solar cells in the first-type photovoltaic module can be L1 = 182.3 mm and L2 = 52.5 mm, and the specific dimensions of the solar cells in the second-type photovoltaic module can be L1 = 182.2 mm and L2 = 45.937 mm.

[0048] Both photovoltaic module cell spacings meet the requirements of 0.5mm≤X≤0.8mm and string spacing of 1.5mm≤Y≤1.8mm, balancing fill rate and heat dissipation space.

[0049] Optionally, the busbar includes a side busbar disposed on the side of the photovoltaic module, the side busbar being foldable to the back of the solar cell.

[0050] Specifically, the busbars are made of tin-plated copper strip with annealing treatment. The side busbars can be folded to the back of the battery cells, without taking up front area or blocking light; there are no protruding busbars on the front, reducing the risk of glass scratches and EVA delamination; the wiring on the back is neat, facilitating junction box soldering and sealing.

[0051] Figure 6 This is a second pattern drawing of a multi-segment photovoltaic module according to an embodiment of the present invention, with reference to... Figure 6 The busbar 44 includes: a central busbar 444, a first side busbar 445, and a second side busbar 446. The hollow central busbar 444 has a width of 4mm, 5mm, or 6mm and a thickness ranging from 0.25mm to 0.4mm. The hollow structure reduces material usage and balances strength and conductivity. The first side busbar 445 and the second side busbar 446 have widths ranging from 4mm to 8mm and thicknesses from 0.15mm to 0.25mm.

[0052] Figure 7 This is a current trend diagram of a multi-segment photovoltaic module according to an embodiment of the present invention, for reference. Figure 7 The current of the quarter-cell module is 1 / 4 of that of the whole module, which reduces the hot spot temperature, reduces local hot spots, and reduces the overall probability of hot spots.

[0053] Meanwhile, jumpers are installed along the width of the photovoltaic module to transmit current. The width must meet the requirement of 6mm ≤ Z ≤ 10mm, ensuring the insulation layer completely separates the leads from the solar cells, guaranteeing the safety of the photovoltaic module. A wider insulation layer also increases the contact area between the insulation layer and the solar cells, improving the installation stability and reliability of the insulation layer. The specific value of Z can be 6mm, 8mm, 10mm, etc. Furthermore, along the thickness direction of the photovoltaic module, the jumper thickness must meet the requirement of 0.15mm ≤ I ≤ 0.25mm. This thickness is designed to prevent microcracks or breakage during lamination while still meeting the required insulation performance. The specific value of I can be 0.15mm, 0.20mm, 0.25mm, etc., ensuring reliable insulation and preventing breakage during lamination.

[0054] According to another aspect of the present invention, a photovoltaic system is provided, the photovoltaic system including multi-segmented photovoltaic modules provided in any embodiment of the present invention.

[0055] The multi-segment photovoltaic modules of this invention are compatible with conventional photovoltaic production lines, requiring no modification to welding machines and junction boxes. This results in high production efficiency and low cost, making them widely applicable to distributed photovoltaic and ground-mounted power station systems. Photovoltaic systems using these modules exhibit lower system losses and higher power generation; the risk of hot spots is low, improving long-term system reliability and safety; and the modules offer good consistency and compatibility with standard equipment, leading to lower system installation and maintenance costs.

[0056] Since the photovoltaic system includes the multi-segmented photovoltaic module provided in any embodiment of the present invention, the above-described photovoltaic system has the same beneficial effects as the multi-segmented photovoltaic module, and will not be repeated here.

[0057] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A multi-cell photovoltaic module, characterized in that, include: Multiple battery cells, each of which is a quarter-cell battery cell cut along the length of a whole battery cell, and the multiple battery cells are arranged into multiple battery strings; The circuit connection structure of the plurality of battery strings includes at least one parallel unit, and each of the parallel units includes four battery strings connected in parallel. Inside each of the battery strings, multiple battery cells are connected in series; The photovoltaic module includes a positive output terminal and a negative output terminal, and the circuit connection structure is a positive-negative circuit structure in which the circuit path from the positive output terminal to the negative output terminal contains only one positive main path and one negative main path. The circuit connection structure also includes: a jumper wire and a jumper wire. The jumper wire is used to connect the battery cells in different battery strings within the same parallel unit to achieve series connection. The jumper wire is used to connect different battery strings within the same parallel unit or to connect a diode in parallel into the circuit. The photovoltaic module further includes: a busbar for connecting the solder strips of the solar cells, wherein at least a portion of the busbar is a hollow structure.

2. The multi-segment photovoltaic module according to claim 1, characterized in that, The positive and negative circuit structure is as follows: all positive connection points are connected to the same positive main bus bar, and all negative connection points are connected to the same negative main bus bar.

3. The multi-segment photovoltaic module according to claim 1, characterized in that, The plurality of battery strings includes: a first battery string, a second battery string, a third battery string, and a fourth battery string arranged sequentially along the width direction of the photovoltaic module; The crossover connects the cells in the second battery string and the third battery string, so that the cells in the second battery string and the third battery string are connected in series.

4. The multi-segment photovoltaic module according to claim 1, characterized in that, The jumper wire is a short jumper wire, and its length is less than the side length of the photovoltaic module.

5. The multi-segment photovoltaic module according to claim 1, characterized in that, The hollow busbar includes two opposing long sides and one short side, the two long sides being used to connect the welding strips and the short side being used to transmit current.

6. The multi-segment photovoltaic module according to claim 1, characterized in that, The solar cells are cut along the long side of the photovoltaic module; The plurality of battery strings are arranged along the width direction of the photovoltaic module, and the jumper wires are arranged along the arrangement direction of the battery cells.

7. The multi-segment photovoltaic module according to claim 1, characterized in that, The photovoltaic module further includes an insulating strip, through which the jumper wire is insulated from the solar cell.

8. The multi-segment photovoltaic module according to claim 1, characterized in that, The busbar includes a side busbar disposed on the side of the photovoltaic module, the side busbar being foldable to the back of the solar cell.

9. The multi-segment photovoltaic module according to claim 1, characterized in that, The length of the solar cell is 182.2mm-182.3mm, and the width of the solar cell is 45.937mm-52.5mm; The photovoltaic module has a cell spacing of 0.5mm-0.8mm and a string spacing of 1.5mm-1.8mm. The width of the hollow busbar is 4mm-6mm, and the thickness of the hollow busbar is 0.25mm-0.4mm. The jumper wire has a width of 6mm-10mm and a thickness of 0.15-0.25mm.

10. A photovoltaic system, characterized in that, Including the multi-segmented photovoltaic module as described in any one of claims 1 to 9.

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