A photovoltaic module and system

Abstract

This invention belongs to the field of photovoltaic power generation technology and discloses a photovoltaic module including four cells A, B, C, and D connected in parallel. Cells A and D have their first electrodes on the same side and are connected by a first busbar. Cells B and C have their first electrodes on the same side and are connected by a second busbar. The second electrodes of the four cells A, B, C, and D are located at the transverse centerline of the photovoltaic module and are connected by a central busbar. The two ends of the central busbar are connected to a first jumper and a second jumper, respectively, which intersect with the first busbar. A third jumper is connected to the middle of the central busbar, intersecting with the second busbar. Diodes are installed on the first, second, and third jumpers, which are located on the back side of a single cell string. The diodes in this invention are dispersed and located far from the centerline of the photovoltaic module, which effectively reduces the risk of stress damage to the backsheet under load.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic power generation technology, and specifically relates to a photovoltaic module and system. Background Technology

[0002] The description of this battery cell is merely to provide background information related to the present invention and does not necessarily constitute prior art.

[0003] Solar photovoltaic (PV) modules are the core components of solar power generation systems. They convert light energy into electrical energy through the photovoltaic effect of the solar cells. They are mainly composed of tempered glass, a sealing layer, a backsheet, and an aluminum alloy frame. The solar cells are encapsulated through processes such as welding and lamination. Currently, multi-segmentation technology, which divides the entire solar cell into multiple slices, is used to reduce current loss and improve the performance of PV modules.

[0004] A type of multi-cell photovoltaic module disclosed in the prior art, such as Figure 1 As shown, the cells of this multi-segment photovoltaic module consist of a central busbar, two jumper busbars, and six photovoltaic cells. The six cells are arranged symmetrically along the central busbar. The positive terminals of the first and second cells face outwards and are connected in parallel via the first jumper busbar. The negative terminals of the third and fourth cells face outwards and are connected in parallel via the first jumper busbar. Diodes are all located at the central busbar, and one diode is located on each side of the first jumper busbar.

[0005] The above solution has the following drawbacks: Since diodes are typically housed in junction boxes, holes need to be drilled in the backplane 101 of the photovoltaic module. The busbar leads pass through these holes and connect to the junction boxes. In this scheme, all diodes are positioned in the middle of the photovoltaic module, and the junction boxes for two bypass diodes are integrated on both sides of the first jumper busbar. This results in the backplane openings being concentrated in the middle of the photovoltaic module, and the large opening size reduces the load-bearing capacity of the backplane. Furthermore, in this scheme, the first jumper busbar needs to connect simultaneously to the positive terminals of the first and second solar cells, as well as the negative terminals of the third and fourth solar cells. Figure 2 As shown, this circuit design characteristic means that the first jumper bus 104 in the above scheme can only be placed at the spacing of the battery string 103. When the front board 102, battery string 103, first jumper bus 104 and back board 101 are laminated, the first jumper bus 104 is easily misaligned, causing local short circuit and voltage loss. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a photovoltaic module and system that can solve the technical problems in the prior art of photovoltaic module circuit design, such as the easy displacement of jumper busbars during lamination causing local short circuits, and the low load-bearing capacity of the back sheet due to concentrated and large-sized openings.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, a photovoltaic module is provided, comprising four parallel-connected solar cells A, B, C, and D; the first electrodes of solar cells A and D are located on the first side of the photovoltaic module and connected by a first busbar; the first electrodes of solar cells B and C are located on the second side of the photovoltaic module and connected by a second busbar. The second electrodes of cell A and cell B, and the second electrodes of cell C and cell D are located at the horizontal centerline of the photovoltaic module and are connected by a short busbar, which intersects with the middle busbar. The two ends of the middle busbar are connected to the first jumper and the second jumper, respectively, and the first jumper and the second jumper intersect with the first busbar; the middle of the middle busbar is connected to the third jumper, which intersects with the second busbar. Diodes are installed on the first jumper, the second jumper and the third jumper, and the first jumper, the second jumper and the third jumper are located on the back of the single battery string.

[0008] Preferably, the photovoltaic module includes multiple rows of battery strings arranged parallel to each other along the longitudinal direction of the photovoltaic module. Cell A includes a first row of battery strings and a second row of upper battery strings connected in series; Cell B includes a second row of lower battery strings and a third row of battery strings connected in series; the polarity of the second row of lower battery strings and the second row of upper battery strings is symmetrical with respect to the transverse centerline of the photovoltaic module, and the first electrodes of the first row of battery strings and the third row of battery strings are located on different sides of the longitudinal direction of the photovoltaic module; Cell C is symmetrical with respect to Cell B, and Cell D is symmetrical with respect to Cell A with respect to the longitudinal centerline of the photovoltaic module.

[0009] Preferably, the central busbar is arranged along the transverse centerline of the photovoltaic module, and the central busbar is located between the first column of battery strings and the sixth column of battery strings.

[0010] Preferably, the back plate has multiple through holes; when there are four through holes, A through hole is made inside the intersection of the short busbar and the middle busbar near the first jumper wire, and a second electrode output terminal is provided there. At the corresponding position of the diode at the intersection of the third jumper and the second busbar, a through hole is opened and the first electrode output terminal is set; A via is made at the corresponding position of the diode at the intersection of the first jumper or the second jumper and the first busbar, and a first electrode output terminal is also provided at one of the vias.

[0011] Preferably, when there are five through holes, through holes are opened inside the intersection of the short busbar and the middle busbar, and the second electrode output terminal is set at the through hole near the second jumper; the positions of the other through holes on the first jumper, second jumper and third jumper remain unchanged.

[0012] Preferably, an insulating isolation strip is provided between the first, second, or third jumper wire and the battery string, and the width of the isolation strip is greater than the width of the jumper wire.

[0013] Preferably, the central busbar passes through the middle of the battery string of B and C cells, and an insulating separator is provided between the central busbar and the battery string of B and C cells.

[0014] Preferably, the first busbar and the end busbars of the B-cell and C-cell battery strings are located on the same side, and the first busbar and the end busbars are arranged side by side; Alternatively, the first busbar and the end busbar are stacked, with a separator strip placed between the first busbar and the end busbar.

[0015] Secondly, a photovoltaic module system is provided, comprising multiple photovoltaic modules as described above, wherein the multiple photovoltaic modules are connected to each other by a T-shaped cable, wherein the two positive ends of the T-shaped cable are connected to the first electrode output terminal of the photovoltaic module, and the negative end is connected to the second electrode output terminal of the adjacent photovoltaic module.

[0016] Thirdly, a photovoltaic module system is provided, comprising multiple photovoltaic modules as described above, wherein the first electrode polarities of adjacent photovoltaic modules are opposite, and the second electrode polarities are also opposite; the first electrode output terminals of two adjacent photovoltaic modules are connected as a group by wires; and the second electrode output terminals of adjacent groups of photovoltaic modules are connected by wires.

[0017] Compared with the prior art, the advantages and positive effects of this invention are: This invention divides six battery strings into four parallel battery cells, altering the internal circuit design of the photovoltaic module. It disperses the diodes away from the center of the photovoltaic module, reducing the size of individual openings and maintaining the structural integrity of the backsheet. This reduces the risk of stress damage to the backsheet under load. Furthermore, the parallel connection of the four battery cells allows jumpers to be placed on the back of a battery string, reducing the risk of parallel connection issues caused by jumper misalignment during lamination. Attached Figure Description

[0018] The accompanying drawings, which constitute a battery cell of the present invention, are provided to further illustrate the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1This is a design diagram of the internal circuit structure of a photovoltaic module using existing technology; Figure 2 This is a schematic diagram showing the location of the first jumper busbar in a photovoltaic module using existing technology. Figure 3 This is a design diagram of the internal circuit structure of the photovoltaic module according to Embodiment 1, Embodiment 2, or Embodiment 3 of the present invention; Figure 4 This is a schematic diagram of the current flow of the photovoltaic module according to Embodiment 1, Embodiment 2, or Embodiment 3 of the present invention; Figure 5 This is a schematic diagram of the back plate when the number of through holes in Embodiment 1, Embodiment 2 or Embodiment 3 of the present invention is four; Figure 6 This is a schematic diagram of the back plate when the number of through holes in Embodiment 1, Embodiment 2 or Embodiment 3 of the present invention is five; Figure 7 This is a schematic diagram of the jumper positions of the photovoltaic module in Embodiment 1, Embodiment 2, or Embodiment 3 of the present invention; Figure 8 This is a schematic diagram of the first busbar and the end busbar arranged side by side in Embodiment 1, Embodiment 2 or Embodiment 3 of the present invention; Figure 9 This is a schematic diagram of the stacked arrangement of the first busbar and the end busbar in Embodiment 1, Embodiment 2 or Embodiment 3 of the present invention; Figure 10 This is a schematic diagram of multiple photovoltaic modules with four through holes connected by a T-junction cable in Embodiment 2 of the present invention; Figure 11 This is a schematic diagram of multiple photovoltaic modules with five through holes connected by a T-junction cable in Embodiment 2 of the present invention; Figure 12 This is a schematic diagram of multiple photovoltaic modules with four through holes connected by cables in Embodiment 3 of the present invention; Figure 13 This is a schematic diagram of multiple photovoltaic modules with five through holes connected by cables in Embodiment 3 of the present invention; In the picture: 1. Battery cell A; 2. Battery cell B; 3. Battery cell C; 4. Battery cell D; 5. First busbar; 6. Second busbar; 7. Short busbar; 8. Middle busbar; 9. First jumper wire; 10. Second jumper wire; 11. Third jumper wire; 12. Diode; 13. End busbar; 14. Through hole; 15. Isolation strip; 16. T-connector cable; 17. Cable; 101. Backplate; 102. Frontplate; 103. Battery string; 104. First jumper busbar. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] Example 1 This embodiment discloses a photovoltaic module, such as Figure 3 As shown, it includes four parallel-connected solar cells: cell A (1), cell B (2), cell C (3), and cell D (4). Figure 3 As shown, the first electrodes of cell A (1) and cell D (4) are located on the first side of the photovoltaic module (with...). Figure 1 , Figure 2 The side of the photovoltaic module that is vertically below the center is the first side, and the side that is vertically above the center is the second side. These sides are connected via the first busbar 5. It can be understood that the first electrodes of cell A (1) and cell D (4) are connected in parallel. For example... Figure 1 As shown, the first electrodes of cell B2 and cell C3 are located on the second side of the photovoltaic module and connected by the second busbar 6; it can be understood that the first electrodes of cell B2 and cell C3 are connected in parallel. When adjacent photovoltaic modules are connected by a T-junction cable, the first electrodes are output through the two first electrode output terminals, realizing the parallel connection of the first electrodes of the four cells.

[0023] like Figure 3 As shown, the second electrodes of cell A 1 and cell B 2, and the second electrodes of cell C 3 and cell D 4 are located at the horizontal centerline of the photovoltaic module and connected by a short busbar 7. The short busbar 7 intersects with the central busbar 8 at points E and F, meaning the second electrodes of cell A 1 and cell B 2 are connected in parallel, the second electrodes of cell C 3 and cell D 4 are connected in parallel, and the second electrodes of cell A 1, cell B 2, cell C 3, and cell D 4 are connected in parallel. In some embodiments, the second electrodes of cell A 1 and cell B 2, and the second electrodes of cell C 3 and cell D 4 are directly connected to the central busbar 8.

[0024] like Figure 3 As shown, the two ends of the central busbar 8 are connected to the first jumper 9 and the second jumper 10, respectively. The first jumper 9 and the second jumper 10 intersect the first busbar 5 at points G and H, respectively. Diodes 12 are installed at points G and H on the side near the central busbar 8. The middle of the central busbar 8 is connected to the third jumper 11, which intersects the second busbar 6 at point I. A diode 12 is installed at point I on the side near the central busbar 8. That is, diodes are installed on the first jumper, the second jumper, and the third jumper.

[0025] In this embodiment, the first, second, and third jumpers connect diodes in parallel across the corresponding cell strings. The diodes, connected in parallel across the protected cells, act as bypasses in the event of hot spots. The current flow of the photovoltaic module in this embodiment is as follows: Figure 4 As shown.

[0026] It should be noted that in this embodiment, the diodes are positioned dispersedly and away from the center of the photovoltaic module. This disperses the openings on the photovoltaic module backsheet 101, reduces the size of individual openings, maintains the structural integrity of the backsheet 101, and thus reduces the risk of stress damage to the backsheet 101 under load. Furthermore, this diode placement design allows the positive and negative leads of the photovoltaic module to be positioned on different horizontal lines. Compared to existing technologies where both positive and negative leads are located in the center of the photovoltaic module, this embodiment eliminates the blank area in the middle of the photovoltaic module, reducing the difficulty of achieving a full-screen display.

[0027] It should also be noted that, since the four battery cells in this embodiment are connected in parallel, as... Figure 7 As shown, the first, second, or third jumper can be placed on the back of a battery string 103 instead of at the gap between two battery strings. In this embodiment, the first, second, or third jumper is placed on the back of a battery string 103 and is held within the front plate 102 and the back plate 101. Compared to the prior art where the first jumper busbar 104 is placed in the middle of the gap between two battery strings 103, when the battery strings on both sides of the first jumper busbar 104 need to be repaired, the pre-fixed first jumper busbar 104 needs to be removed, which will cause additional damage to adjacent battery strings. During lamination, the first jumper busbar 104 may shift, causing the battery strings to shift, resulting in a smaller gap between the battery strings and parallel connection. In this embodiment, the first, second, or third jumper is placed on the back of a battery string, which can halve the risk of damage during repair and also reduce the risk of parallel connection caused by jumper shift during lamination.

[0028] Furthermore, compared to the two jumpers in the prior art, the first, second, and third jumpers in this embodiment not only shorten the total length of the jumpers, saving costs, but also reduce the length of a single long jumper. In the prior art, the length of a long jumper is 2.4 meters, and during installation, it is difficult to ensure the verticality of the long jumper, which is prone to bending. The length of the first, second, or third jumper in this embodiment is only half that of the long jumper in the prior art, making it easier to ensure the verticality of the first, second, or third jumper during installation.

[0029] like Figure 3 As shown, the four solar cells A, B, C, and D are composed of multiple rows of cell strings 103. In this embodiment, six rows of cell strings 103 are arranged parallel to each other along the longitudinal direction of the photovoltaic module. Figure 3 As shown, battery cell A 1 includes a first column of battery strings and a second column of upper battery strings connected in series, and battery cell B 2 includes a second column of lower battery strings and a third column of battery strings connected in series. In this embodiment, this series connection can be achieved by electrically connecting the output end of the first column of battery strings to the input end of the second column of upper battery strings, for example, by welding, or by connecting the end of the first column of battery strings to the beginning of the second column of upper battery strings through wires on the back plate 101; the connection method of the second column of lower battery strings and the third column of battery strings is the same as the connection method of the first column of battery strings and the second column of upper battery strings.

[0030] like Figure 3 As shown, the polarity of the lower half of the second column of battery strings is symmetrical with respect to the horizontal centerline of the photovoltaic module. That is, the electrode directions of the lower half of the second column of battery strings are mirror symmetrical with respect to the upper half of the second column of battery strings. If the current direction of the upper half of the second column of battery strings is from top to bottom, then the current direction of the lower half of the second column of battery strings is from bottom to top.

[0031] like Figure 3 As shown, the first electrodes of the first and third battery strings are located on different sides of the photovoltaic module's longitudinal direction. In this embodiment, the first electrode of the first battery string is located on the first side of the photovoltaic module, and the first electrode of the third battery string is located on the second side of the photovoltaic module. Figure 1 As shown, cell C3 and cell B2 are symmetrical with respect to the longitudinal centerline of the photovoltaic module, and cell D4 and cell A1 are symmetrical with respect to the longitudinal centerline of the photovoltaic module.

[0032] like Figure 3 As shown, the central busbar 8 is arranged along the transverse centerline of the photovoltaic module, and is located between the first and sixth rows of cell strings. That is, the overall length of the central busbar is limited within the transverse boundary defined by the two outermost rows of cell strings (i.e., the first and sixth rows). By arranging the central busbar 8 along the transverse centerline of the photovoltaic module, the current collection path length from the cell strings in the upper and lower halves of the photovoltaic module (relative to the transverse centerline) to the central busbar is ensured to be consistent, thereby achieving a balanced current distribution and effectively reducing resistance losses caused by path differences. Simultaneously, the central busbar's location between the first and sixth rows of cell strings ensures it remains within the effective power generation area of ​​the photovoltaic module, preventing it from exceeding the cell string array range and optimizing the internal space utilization of the photovoltaic module.

[0033] like Figure 5 , Figure 6 As shown, the back plate 101 has multiple through holes 14, and the number of through holes 14 is four or five.

[0034] When the number of through holes is four, such as Figure 5 As shown, a through hole 14 is opened inside point E, the intersection of the short busbar 7 and the middle busbar 8 near the first jumper 9 (the side facing the third jumper is the inside), and a second electrode output terminal is provided at this through hole 14; a through hole 14 is opened at the corresponding position of the diode 12 at the intersection of the third jumper 11 and the second busbar 6, and a first electrode output terminal is provided at this through hole 14; at the same time, through holes 14 are also opened at the corresponding positions of the diode 12 at the intersection of the first jumper 9 or the second jumper 10 and the first busbar 5, and a first electrode output terminal is also provided at one of these two through holes 14.

[0035] The second electrode output terminal is a key node where the second electrodes of cells A and B, and the second electrodes of cells C and D converge and are connected to the middle busbar via a short busbar, enabling the extraction of the second electrode potential of the photovoltaic module. The first electrode output terminal is designed in two locations, corresponding to the positions where the first electrodes of cells B and C converge via the second busbar, and the positions where the first electrodes of cells A and D converge via the first busbar and are connected to the middle busbar, enabling the extraction of the first electrode potential of the photovoltaic module.

[0036] It is understandable that the first electrode output terminal and the second electrode output terminal are used for the connection between photovoltaic modules, or for the connection between photovoltaic modules and external cables.

[0037] In the above-described opening method, the back plate 101 has four through holes. When the back plate 101 has five through holes, such as Figure 6 As shown, the backplate 101 has through holes 14 on the inner side of the two intersections of the short busbar 7 and the middle busbar 8, and a second electrode output terminal is provided at the through hole 14 near the intersection of the second jumper 10; the positions of the other through holes 14 and the position of the first electrode output terminal remain unchanged.

[0038] When five through holes are provided on the back plate 101, and the back plate 101 has through holes 14 at the two intersections of the short busbar 7 and the middle busbar 8, the first jumper 9 is placed on the outside of the back plate 101. This can further reduce the number of built-in jumpers, simplify the internal structure, reduce manufacturing difficulty, further reduce rework damage, and reduce the risk of parallel and series connection of battery strings during lamination.

[0039] In this embodiment, the first jumper, the second jumper, and the third jumper are made of the same material and are of the same size, such as... Figure 7As shown, an insulating isolation strip 15 is provided between the first, second, or third jumper wire and the battery string, and the width of the isolation strip 15 is greater than the width of the jumper wire. The insulating isolation strip between the jumper wire and the battery string ensures electrical isolation between them, effectively preventing short circuits or leakage, and ensuring the electrical safety and long-term stability of the photovoltaic module. Designing the width of the isolation strip to be greater than the width of the jumper wire provides additional protection margin for the insulation layer (isolation strip), effectively addressing positioning errors during manufacturing and minor deformations that may occur during photovoltaic module operation. This ensures that the insulating isolation strip can always completely cover and isolate the jumper wire, improving the overall reliability and durability of the photovoltaic module.

[0040] In this embodiment, as Figure 3 , Figure 5 , Figure 6 As shown, when the central busbar 8 passes through the battery strings of B and C cells, an insulating separator 15 is also provided between the central busbar and the battery strings of B and C cells. It is understood that the central busbar 8, as an important conductive component, passes through the battery strings of B and C cells to connect the second electrode of the battery strings; the separator effectively prevents electrical faults such as short circuits and leakage between the central busbar 8 and the battery strings of B and C cells, and also provides a certain degree of mechanical protection.

[0041] like Figure 3 , Figure 5 , Figure 6 As shown, in this embodiment, the first busbar 5 and the end busbars 13 of the B-cell 2 and C-cell 3 battery strings are arranged on the same side, forming a compact arrangement; as Figure 8 As shown, the first busbar 5 is arranged in parallel with the end busbars 13 of the B and C cell strings, and the end busbars 13 and the first busbar 5 maintain a set distance. This arrangement helps to reduce the overall thickness of the photovoltaic module, simplify the manufacturing process, and facilitate heat dissipation.

[0042] Or such as Figure 9 As shown, the first busbar and the end busbars of the B-cell and C-cell strings are stacked together, and an isolation strip 15 is placed between the first busbar and the end busbars 13 of the B-cell and C-cell strings. This method can effectively save the planar space of the photovoltaic module.

[0043] Example 2 This embodiment discloses a photovoltaic module system, including multiple photovoltaic modules disclosed in Embodiment 1, which are connected to each other via a T-shaped cable 16.

[0044] When a photovoltaic module has four through holes, such as Figure 10As shown, multiple photovoltaic modules are connected by a T-shaped cable 16. The two positive ends of the T-shaped cable 16 are connected to the first electrode output terminal of the photovoltaic module (positive terminal in this embodiment), and the negative end is connected to the second electrode output terminal of the adjacent photovoltaic module (negative terminal in this embodiment).

[0045] When a photovoltaic module has five through holes, such as Figure 11 As shown, multiple photovoltaic modules are connected by a three-way cable 16. The two positive ends of the three-way cable 16 are connected to the first electrode output terminal of the photovoltaic module (positive terminal in this embodiment), and the negative end is connected to the second electrode output terminal of the adjacent photovoltaic module (negative terminal in this embodiment). When the photovoltaic module has five through holes, the second electrode output terminal is set close to the second jumper 10, and the first jumper 9 is located on the outside of the photovoltaic module.

[0046] Example 3 This embodiment discloses a photovoltaic module system, including multiple photovoltaic modules as disclosed in Embodiment 1, which are connected by a cable 17. Figure 12 , Figure 13 As shown, the first electrodes of adjacent photovoltaic modules have opposite polarities, and the second electrodes also have opposite polarities. That is, the first electrode of one photovoltaic module is positive and the second electrode is negative, while the first electrode of adjacent photovoltaic modules is negative and the second electrode is positive.

[0047] like Figure 12 , Figure 13 As shown, when the photovoltaic module has four or five through holes, the first electrode output terminals of two adjacent photovoltaic modules are connected as a group via cable 17, and the second electrode output terminals of adjacent groups of photovoltaic modules are connected via cable 17. When the photovoltaic module has five through holes, the second electrode output terminal is positioned close to the second jumper 10, and the first jumper 9 is located on the outside of the photovoltaic module.

[0048] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A photovoltaic module, characterized in that, It includes four parallel solar cells: A, B, C, and D; the first electrodes of solar cells A and D are located on the first side of the photovoltaic module and connected by a first busbar; the first electrodes of solar cells B and C are located on the second side of the photovoltaic module and connected by a second busbar. The second electrodes of cell A and cell B, and the second electrodes of cell C and cell D are located at the horizontal centerline of the photovoltaic module and are connected by a short busbar, which intersects with the middle busbar. The two ends of the central busbar are respectively connected to a first jumper and a second jumper, which intersect with the first busbar; the middle of the central busbar is connected to a third jumper, which intersects with the second busbar; diodes are provided on the first, second, and third jumpers, and the first, second, and third jumpers are located on the back of the single battery string.

2. A photovoltaic module as described in claim 1, characterized in that, The photovoltaic module includes multiple rows of battery strings arranged parallel to each other along the longitudinal direction of the photovoltaic module. The A-cell includes a first row of battery strings and a second row of upper battery strings connected in series. The B-cell includes a second row of lower battery strings and a third row of battery strings connected in series. The polarity of the second row of lower battery strings and the second row of upper battery strings is symmetrical with respect to the transverse centerline of the photovoltaic module. The first electrodes of the first row of battery strings and the third row of battery strings are located on different sides of the longitudinal direction of the photovoltaic module. The C-cell is symmetrical with respect to the B-cell and the D-cell is symmetrical with respect to the longitudinal centerline of the photovoltaic module.

3. A photovoltaic module as described in claim 2, characterized in that, The central busbar is arranged along the transverse centerline of the photovoltaic module, and is located between the first column of battery strings and the sixth column of battery strings.

4. A photovoltaic module as described in claim 1, characterized in that, The back panel of the photovoltaic module has multiple through holes, and when there are four through holes; A through hole is made inside the intersection of the short busbar and the middle busbar near the first jumper wire, and a second electrode output terminal is provided there. At the corresponding position of the diode at the intersection of the third jumper and the second busbar, a through hole is opened and the first electrode output terminal is set; A via is made at the corresponding position of the diode at the intersection of the first jumper or the second jumper and the first busbar, and a first electrode output terminal is also provided at one of the vias.

5. A photovoltaic module as described in claim 4, characterized in that, When there are five through holes, through holes are opened inside the intersection of the short busbar and the middle busbar. The second electrode output terminal is set at the through hole near the second jumper. The positions of the other through holes on the first jumper, second jumper and third jumper remain unchanged.

6. A photovoltaic module as described in claim 1, characterized in that, An isolation strip is provided between the first, second, or third jumper and the battery string, and the width of the isolation strip is greater than the width of the jumper.

7. A photovoltaic module as described in claim 1, characterized in that, The central busbar passes through the middle of the battery string of B and C cells, and an isolation strip is provided between the central busbar and the battery string of B and C cells.

8. A photovoltaic module as described in claim 1, characterized in that, The first busbar and the end busbars of the B-cell and C-cell battery strings are located on the same side, and the first busbar and the end busbars are arranged side by side; Alternatively, the first busbar and the end busbar are stacked, with a separator strip placed between the first busbar and the end busbar.

9. A photovoltaic module system, characterized in that, The device includes a plurality of photovoltaic modules as described in any one of claims 1-8, wherein the plurality of photovoltaic modules are connected to each other by a T-connector cable, wherein the two positive ends of the T-connector cable are connected to the first electrode output terminal of the photovoltaic module, and the negative end is connected to the second electrode output terminal of the adjacent photovoltaic module.

10. A photovoltaic module system, characterized in that, The system includes multiple photovoltaic modules as described above, wherein the first electrode polarities of adjacent photovoltaic modules are opposite, and the second electrode polarities are also opposite; the first electrode output terminals of two adjacent photovoltaic modules are connected as a group by wires; and the second electrode output terminals of adjacent groups of photovoltaic modules are connected by wires.

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