Photovoltaic module and method of manufacturing a photovoltaic module

Abstract

The application discloses a photovoltaic module and a photovoltaic module preparation method. The photovoltaic module comprises a cell string, and the cell string comprises a plurality of cell pieces arranged in an overlapping manner. The cell piece has opposite cutting edges and a first non-cutting edge. In the direction from the back surface to the front surface of the photovoltaic module, the (N+1)th cell piece in the cell string overlaps with the Nth cell piece at the edges, and the cutting edge of the (N+1)th cell piece is pressed on the first non-cutting edge of the Nth cell piece. In the embodiment of the application, the cutting edge of the (N+1)th cell piece is pressed on the first non-cutting edge of the Nth cell piece, that is, the first non-cutting edge is pressed. The mechanical performance and passivation performance of the first non-cutting edge are good, and the first non-cutting edge is not prone to hidden cracks.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a photovoltaic module and a method for manufacturing a photovoltaic module. Background Technology

[0002] In laminated modules, solar cells are stacked and connected into strings by solder ribbons to accommodate more cells within a limited area, thereby improving space utilization and module power generation.

[0003] However, at the overlap of two adjacent cells, the pressed edge is prone to microcracks due to the pressure generated during hot-press welding or mechanical assembly. Summary of the Invention

[0004] This invention provides a photovoltaic module and a method for manufacturing a photovoltaic module, aiming to at least solve the technical problem that the edge of the pressed part at the overlap of two adjacent cells in a shingled module is prone to microcracks.

[0005] This invention provides a photovoltaic module, including a battery string, wherein the battery string includes multiple battery cells arranged in an overlapping manner;

[0006] The solar cell has a cut edge and a first uncut edge, pointing from the back of the photovoltaic module to the front. The N+1th solar cell in the solar cell string overlaps with the edge of the Nth solar cell, and the cut edge of the N+1th solar cell presses on the first uncut edge of the Nth solar cell.

[0007] In the battery string, two adjacent battery cells overlap to form an overlapping area. The photovoltaic module has M overlapping areas. At least M / 3 of the overlapping areas, the cut edge presses against the first non-cut edge. N and M are both positive integers.

[0008] In this embodiment of the invention, the cut edge of the (N+1)th solar cell presses against the first non-cut edge of the Nth solar cell. That is, the pressed edge is the first non-cut edge, which has better mechanical and passivation properties, making it less prone to microcracks. This avoids the problem of microcracks easily occurring at the overlapping area of ​​the Nth and N+1th solar cells. Furthermore, at least M / 3 overlapping areas have the cut edge pressing against the first non-cut edge. In this case, the bottom layer of the overlapping areas in the entire photovoltaic module has better support performance, providing multi-point support for the entire photovoltaic module. This reduces the pressure on the weaker overlapping areas and improves the overall microcrack resistance of the photovoltaic module.

[0009] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0010] Figure 1 This is a partial structural diagram of a first type of battery string in a photovoltaic module provided in an embodiment of the present invention;

[0011] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0012] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0013] Figure 4 for Figure 1 Enlarged view of point C in the middle;

[0014] Figure 5 for Figure 1 Enlarged view of point D in the middle;

[0015] Figure 6 for Figure 1 A schematic diagram of the structure of some of the battery cells in the provided battery string;

[0016] Figure 7 This is a partial structural diagram of a second type of battery string in a photovoltaic module provided in an embodiment of the present invention;

[0017] Figure 8 A schematic diagram of the negative terminal structure of the first type of battery string and the second type of battery string in the photovoltaic module provided in this embodiment of the invention;

[0018] Figure 9 This is a schematic diagram of the structure of a battery cell A provided in an embodiment of the present invention;

[0019] Figure 10 A simplified schematic diagram of a photovoltaic module provided in an embodiment of the present invention;

[0020] Figure 11 A simplified schematic diagram of another photovoltaic module provided in an embodiment of the present invention;

[0021] Figure 12 A simplified schematic diagram of another photovoltaic module provided in an embodiment of the present invention;

[0022] Figure 13 This is a schematic diagram of the structure of a lead-out hole in a photovoltaic module provided in an embodiment of the present invention;

[0023] Figure 14 This is a schematic diagram of another type of lead-out hole in a photovoltaic module provided by an embodiment of the present invention;

[0024] Figure 15 Schematic diagram of the structure of battery cell a and battery cell b provided in the embodiments of the present invention. Figure 1 ;

[0025] Figure 16 Schematic diagram of the structure of battery cell a and battery cell b provided in the embodiments of the present invention. Figure 2 ;

[0026] Figure 17 Schematic diagram of the structure of battery cell a and battery cell b provided in the embodiments of the present invention. Figure 3 ;

[0027] Figure 18 Schematic diagram of the structure of battery cell a and battery cell b provided in the embodiments of the present invention. Figure 4 ;

[0028] Figure 19 A schematic diagram of the arrangement of the four battery cells before overlapping arrangement provided in an embodiment of the present invention. Figure 1 ;

[0029] Figure 20 A schematic diagram of the arrangement of the four battery cells before overlapping arrangement provided in an embodiment of the present invention. Figure 2 ;

[0030] Figure 21 This is a schematic diagram of the structure of the first battery cell in the first incoming material provided in an embodiment of the present invention;

[0031] Figure 22 This is a schematic diagram of the structure of the second battery cell in the second incoming material provided in an embodiment of the present invention.

[0032] Figure label:

[0033] 10-Battery cell, 11-Cut edge, 12-First uncut edge, 13-Second uncut edge, 14-First chamfer, 15-Second chamfer, 16-Connecting part array, 161-Positive electrode connecting part array, 162-Negative electrode connecting part array, 17-Edge connecting part, 18-First battery cell, 19-Second battery cell;

[0034] 20-Interconnector, 21-First interconnector, 22-Second interconnector, 30-Lead-out hole, 40-Wire A;

[0035] 50-cell A, 60-cell a, 70-cell b. Detailed Implementation

[0036] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0037] Reference Figures 1 to 5 This invention provides a photovoltaic module, including multiple battery strings connected in series and parallel. The battery strings are electrically connected to each other via busbars. The number of battery strings in the upper part of the photovoltaic module can be odd or even. When the number of battery strings is odd, an additional conductor is needed to act as a battery string, allowing the battery strings to be connected in series and parallel in pairs.

[0038] The battery string includes multiple overlapping battery cells 10; each battery cell 10 has a cut edge 11 and a first uncut edge 12, pointing from the back of the photovoltaic module to the front. The edges of the (N+1)th battery cell 10 in the battery string overlap with those of the Nth battery cell 10, and the cut edge 11 of the (N+1)th battery cell 10 presses against the first uncut edge 12 of the Nth battery cell 10. Adjacent battery cells 10 in the battery string overlap to form overlapping regions. The photovoltaic module has M overlapping regions. At least at M / 3 overlapping regions, the cut edge 11 presses against the first uncut edge 12. N and M are both positive integers.

[0039] The number of cells in a single battery string can be set according to actual needs, for example, it can be set to 10-30. A battery string can include an odd number of cells 10 or an even number of cells 10. The cell 10 can be a back-contact cell with alternating positive and negative grids on its back side; it can also be a bifacial cell 10, such as a TOPcon (Tunnel Oxide Passivating Contacts) cell or a heterojunction cell, with the positive and negative grids respectively located on the front and back sides of the cell 10. The cell 10 can be a cell with a main grid or a cell without a main grid. The cell 10 has a long side extending along its length direction; the cut edge 11 is the long side formed by cutting the cell 10, and the first uncut edge 12 is the original, uncut long side of the cell 10. The length direction of the cell 10 is parallel to the width direction of the battery string, which can be referenced... Figure 1 and Figure 3 Y1 is shown in the figure.

[0040] The cut edge 11 of the (N+1)th solar cell 10 presses on the first non-cut edge 12 of the Nth solar cell 10, meaning that the cut edge 11 of the (N+1)th solar cell 10 and the first non-cut edge 12 of the Nth solar cell 10 overlap, and are located on the side of the first non-cut edge 12 of the Nth solar cell 10 facing the back of the photovoltaic module.

[0041] The overlapping region is the area where the edges of the (N+1)th solar cell 10 overlap with those of the Nth solar cell 10. The overlapping region is an elongated strip-shaped area extending along the length of the solar cell 10. One type of overlapping region can be described as follows: Figure 4 R1 shown in the figure, another overlapping region can be referred to Figure 5 R2 is shown in the figure. If the number of cells in a single cell string is x, the number of overlapping areas is x-1, and the photovoltaic module has K cell strings, then the total number of overlapping areas M of the photovoltaic module is equal to K×(x-1).

[0042] In the manufacturing process of photovoltaic modules, the following steps are typically performed sequentially: front glass, front encapsulating film, cell strings arranged on the front encapsulating film, back encapsulating film, and backsheet. This laminated assembly is then heated and pressure is applied. The encapsulating film can be made of EVA (ethylene-vinyl acetate copolymer), POE (polyolefin elastomer), or EPE (expanded polyethylene foam), etc. The front glass can be tempered glass, semi-tempered glass, or patterned glass. The backsheet can be white or made of glass.

[0043] In this embodiment of the invention, the cut edge 11 of the (N+1)th solar cell 10 presses against the first non-cut edge 12 of the Nth solar cell 10. That is, the first non-cut edge 12 is pressed down. The first non-cut edge 12 has better mechanical and passivation properties, making it less prone to microcracks. This avoids the problem of microcracks easily occurring on the pressed edge at the overlapping area of ​​the Nth and N+1th solar cells 10. Furthermore, at least M / 3 overlapping areas have the cut edge 11 pressing against the first non-cut edge 12. In this case, the bottom layer of the overlapping areas in the entire photovoltaic module has better support performance, providing multi-point support for the entire photovoltaic module. This reduces the pressure on the weak overlapping areas and improves the overall microcrack resistance of the photovoltaic module.

[0044] In some embodiments, at least M / 2 overlapping regions, the cut edge 11 presses against the first non-cut edge 12. The proportion of the first non-cut edge 12 with better mechanical properties as the bearing edge is further increased. When the cut edge 11 with weaker mechanical properties acts as the bearing edge in the entire photovoltaic module, the probability and number of the first non-cut edge 12 in the adjacent overlapping region acting as the bearing edge are greatly increased. This can provide a certain buffering effect for the cut edge 11 acting as the bearing edge from all sides, and can further improve the overall anti-microcrack performance of the photovoltaic module.

[0045] In some embodiments, at all overlapping areas, the cut edge 11 presses against the first non-cut edge 12. This design ensures that the first non-cut edge 12 bears the pressure at all overlapping areas in the entire photovoltaic module, and there is no weak cut edge 11 bearing the pressure in the photovoltaic module, which can significantly improve the overall anti-microcrack performance of the photovoltaic module.

[0046] In some embodiments, multiple battery cells 10 in a battery string are arranged in an overlapping manner, which simplifies the manufacturing process of the battery string. Furthermore, since each battery cell 10 in the battery string has one end under pressure and the other end facing upwards, the stress distribution is essentially uniform, preventing some battery cells 10 from cracking due to excessive localized stress. In the battery string, multiple battery cells 10 are arranged in an overlapping manner along the direction from the first end to the last end. The direction from the first end to the last end of the battery string can be referred to... Figure 1 and Figure 6 The direction indicated by arrow X1. Preferably, all cell strings in the photovoltaic module are designed identically, each including alternating first cells 18 and second cells 19.

[0047] In some embodiments, refer to Figure 2 and Figure 3 The end of the cut edge 11 is a right angle; the end of the first non-cut edge 12 is a first chamfer 14 or a second chamfer 15, with the length of the first chamfer 14 being greater than the length of the second chamfer 15. During the production process, the cut edge 11 and the first non-cut edge 12 can be more easily distinguished based on the right angle and chamfer, which facilitates the adjustment of the direction and arrangement of the battery cells 10.

[0048] The first chamfer 14 and the second chamfer 15 can be beveled chamfers. The length of the first chamfer 14 refers to the distance between its two endpoints, and the length of the second chamfer 15 refers to the distance between its two endpoints. The distance between the two endpoints of the chamfer can be a straight line, an arc, or a curve.

[0049] In some embodiments, refer to Figure 6 and Figure 7 The battery string includes alternating first battery pieces 18 and second battery pieces 19; the end of the first uncut edge 12 of the first battery piece 18 is a first chamfer 14, and the end of the first uncut edge 12 of the second battery piece 19 is a second chamfer 15.

[0050] In this embodiment, along the direction from the first end to the last end of the battery string, i.e., the X1 direction, the first cell in the battery string can be either the first cell 18 or the second cell 19. By alternately arranging the first cell 18 and the second cell 19, the large-beveled cells 10 (cells 10 with a first bevel 14) and the small-beveled cells 10 (cells 10 with a second bevel 15) can be evenly distributed in the photovoltaic module, which helps to reduce current mismatch and current loss in the cells 10. Here, the large bevel refers to the first bevel 14, and the small bevel refers to the second bevel 15.

[0051] The overlapping area formed when the pressing end of the cut edge 11 is the first non-cut edge 12 with a large chamfer is referenced. Figure 4 The overlapping area formed when the cut edge 11 is pressed at a small chamfer at the first non-cut edge 12, as shown in the figure, is referenced. Figure 4 As shown in R2, the endpoint positions of the two overlapping regions are different. By alternating the arrangement of the first non-cutting edge 12 with a large chamfer at the pressing end of the cutting edge 11 and the first non-cutting edge 12 with a small chamfer at the pressing end of the cutting edge 11, the two overlapping regions with different endpoint positions can be arranged alternately, thereby causing the stress concentration part to be misaligned along the width direction of the battery string.

[0052] In some embodiments, the length ratio of the first chamfer 14 to the second chamfer 15 is less than or equal to 8 and greater than 1; or, the length ratio of the first chamfer 14 to the second chamfer 15 is between 1.12 and 7.4.

[0053] The length ratio of the first chamfer 14 to the second chamfer 15 can be 1.12, 3, 3.5, 4, 4.4, 5, 6, 7, 7.4, etc., or it can be 7.5, 7.6, 7.7, 7.7, 7.9, 8, etc. In this embodiment, a large difference in length between the first chamfer 14 and the second chamfer 15 can be avoided, thereby ensuring that the stress difference between the overlapping areas in the battery string is small and reducing the difficulty of the process.

[0054] In some embodiments, refer to Figure 2 and Figure 3 From the back of the photovoltaic module to the front, the chamfered portion at the end of the first non-cut edge 12 is covered by the cut edge 11. When the chamfer is only partially covered, the overlapping area size can be accurately determined by the covered length or the remaining exposed length of the chamfer.

[0055] In some embodiments, the lengths of the chamfers at both ends of the first non-cut edge 12 covered by the cut edge 11 are not equal. In this embodiment, when the dimensions of the coverage at the left and right ends of the first non-cut edge 12 are different, the pressure points of the two chamfers are not on a line of parallel edges, making it less likely for cracks to appear in the left-right direction.

[0056] In some embodiments, the ratio of the length of the first non-cut edge 12 to the length of the cut edge 11 is greater than or equal to 0.91 and less than 1.

[0057] The ratio of the length of the first non-cutting edge 12 to the length of the cutting edge 11 can be 0.91, 0.93, 0.94, 0.95, 0.98, etc.

[0058] If the length of the first non-cut edge 12 with the first chamfer 14 is less than the length of the first non-cut edge 12 with the second chamfer 15, then the ratio of the length of the first non-cut edge 12 with the first chamfer 14 to the length of the cut edge 11 is less than the ratio of the length of the first non-cut edge 12 with the second chamfer 15 to the length of the cut edge 11. The ratio of the length of the first non-cut edge 12 with the first chamfer 14 to the length of the cut edge 11 can be 0.948, and the ratio of the length of the first non-cut edge 12 with the second chamfer 15 to the length of the cut edge 11 can be 0.98. By controlling the length of the first non-cut edge 12, the chamfer can be kept relatively small, thereby maximizing the effective area of ​​the battery cell 10.

[0059] In some embodiments, in the battery string, the width difference between the (N+1)th battery cell 10 and the Nth battery cell 10 is less than or equal to 1.2 mm. The width of the battery cell 10 can be controlled by the cutting process, thereby effectively controlling the area of ​​each battery cell 10 in the module to be more consistent, thus ensuring that the current of each battery cell 10 is balanced and reducing losses caused by current imbalance.

[0060] The width difference between the (N+1)th solar cell 10 and the Nth solar cell 10 can be 0mm, 0.5mm, 0.8mm, 1mm, 1.2mm, etc. Preferably, the width difference between the (N+1)th solar cell 10 and the Nth solar cell 10 is less than or equal to 0.2mm.

[0061] In some embodiments, the width of the overlapping region is greater than or equal to 0.2 mm and less than or equal to 1.2 mm. The width of the overlapping region can be 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, etc. Preferably, the width of the overlapping region is 0.3 mm to 0.7 mm. If the width of the overlapping region is too small, the pressed edge is prone to microcracks; if it is too large, it will obscure too many electrodes. In this embodiment, when the overlapping region is within the above-mentioned range, microcracks on the pressed edge can be further avoided, while the obscuring of electrodes can be reduced. The aforementioned width of the overlapping region helps to improve process efficiency while reducing the risk of microcracks.

[0062] In some embodiments, the photovoltaic module further includes a front encapsulant film and a back encapsulant film, with the front encapsulant film extending into the overlapping area and the back encapsulant film extending into the overlapping area. The cell string is located between the front and back encapsulant films. The encapsulant film in the photovoltaic module acts as an adhesive and fixing layer structure. By extending the front and back encapsulant films into the overlapping area, the gaps in the overlapping area of ​​the two cells 10 can be filled, thereby stabilizing the two cells 10, preventing friction in the overlapping area, further reducing the risk of microcracks during photovoltaic module service, and improving the lifespan of the photovoltaic module. It should be understood that the encapsulant film extending into the overlapping area can form discrete encapsulant film dots, or it can be connected to the original encapsulant film to form a single unit. The encapsulant film can extend into a portion or the entire overlapping area.

[0063] In some embodiments, the solar cell 10 has a plurality of fine grid electrodes, and the number of fine grid electrodes located in an overlapping region is less than or equal to 2. The number of fine grid electrodes located in an overlapping region can be 0, 1, 2, etc. Preferably, the number of fine grid electrodes located in an overlapping region is 0, that is, the overlapping region and the fine grid electrodes do not overlap.

[0064] The fine grid electrodes protrude from the cell body. If there are many fine grid electrodes in the overlapping area, it will lead to local stress concentration in the overlapping area (where there are fine grid electrodes). In this embodiment, the number of fine grid electrodes in an overlapping area is small, or even zero, which can reduce the local compression of the cell 10 by the fine grid electrodes in the overlapping area and reduce the risk of microcracks. When the number of fine grid electrodes in an overlapping area is zero, process errors are allowed. For example, in a photovoltaic module, most overlapping areas have no fine grid electrodes. If individual fine grid electrodes are in the overlapping area, it is considered a process error.

[0065] In some embodiments, the first side of the battery cell 10 at the cut edge 11 has a first passivation layer.

[0066] The solar cell 10 has four sides, with the first side corresponding to the cut edge 11. The first passivation layer can be made of silicon oxide, aluminum oxide, aluminum nitride, etc. A portion of the interconnect 20 is pressed onto the cut edge 11. This interconnect 20 has a bent portion that bends from the back of the photovoltaic module to the front, and the bent portion is located on one side of the first side. In this embodiment, the first side has a first passivation layer, which can prevent the solar cell 10 from failing due to metal particles from the interconnect 20 migrating into the interior of the solar cell 10 through the first side.

[0067] In some embodiments, the second side of the battery cell 10 at the location of the first non-cut edge 12 has a second passivation layer. The second passivation layer covers the second side and the front and back sides of the battery cell 10, making the transition between surfaces smooth and reducing stress abrupt changes between surfaces, thereby reducing the risk of fragmentation and microcracks.

[0068] In some embodiments, the thickness of the second passivation layer is greater than the thickness of the first passivation layer; the number of layers of the second passivation layer is greater than the number of layers of the first passivation layer.

[0069] The second side is the side of the solar cell 10 corresponding to the first non-cut edge 12. The solar cell 10 is cut from solar cell A50. During the fabrication of solar cell A50, passivation layers are formed on its four sides. The second passivation layer on the second side of the solar cell 10, formed by cutting solar cell A50, is formed during the fabrication of solar cell A50, while the first passivation layer on the first side is added separately later. A thicker second passivation layer or more layers at the position of the first non-cut edge 12 helps to enhance the pressure-bearing capacity of the first non-cut edge 12 and reduce the risk of microcracks.

[0070] In some embodiments, refer to Figure 1 The battery cell 10 also has a second uncut edge 13 adjacent to the cut edge 11. On the third side of the battery cell 10 at the location of the second uncut edge 13, the extension portion of the first passivation layer is located above the extension portion of the second passivation layer. The second uncut edge 13 is the original, uncut short side of the battery cell 10, and the third side is the side of the battery cell 10 corresponding to the second uncut edge 13. The first and second passivation layers extend to the third side during their formation. The extension and superposition of the first and second passivation layers on the third side ensures sufficient coverage of the passivation layers on both the first side (cut surface) and the second side (uncut surface).

[0071] In some embodiments, the roughness of the second side surface is less than that of the first side surface. Specifically, the second side surface is a polished surface, and the first side surface is a damaged surface. When the second side surface is polished or has a smaller roughness, there are relatively fewer stress peaks or stress abrupt change points compared to the damaged surface, which can reduce the risk of microcracks appearing on the second side surface.

[0072] In some embodiments, refer to Figure 6 The battery cell 10 has multiple rows of connecting portions 16 for electrical connection with the interconnecting member 20; in the battery string, the multiple rows of connecting portions 16 in the (N+1)th battery cell 10 are centrally symmetrical with the multiple rows of connecting portions 16 in the Nth battery cell 10. The connecting portion row 16 is a column composed of multiple connecting portions.

[0073] One of the connection rows 16 includes a plurality of connection portions spaced apart along the width direction of the battery cell 10. The connection portions can be pads provided on the fine grid electrode, or portions on the fine grid electrode used for electrical connection with the interconnect 20. The plurality of connection rows 16 include a positive electrode connection row 161 and a negative electrode connection row 162. The plurality of connection rows 16 are centrally symmetrical, primarily in that the arrangement of the positive electrode connection row 161 and the negative electrode connection row 162 is centrally symmetrical, allowing for dimensional errors.

[0074] In this embodiment, the multiple connecting columns 16 in the N+1th battery cell 10 are centrally symmetrical with the multiple connecting columns 16 in the Nth battery cell 10, which can ensure that when the interconnecting member 20 is welded to the battery cell 10, the interconnecting member 20 extends in a straight line, which facilitates the layout of the interconnecting member 20.

[0075] In some embodiments, refer to Figure 6 , Figure 7 and Figure 9 The battery string includes alternating first battery cells 18 and second battery cells 19, with adjacent first battery cells 18 and second battery cells 19 being cut from the same battery cell A50; the battery cell A50 is a whole battery cell, a 1 / 2 battery cell, a 1 / 3 battery cell, or a 1 / 4 battery cell; the battery cell A50 has at least 2 partitions, and the connecting column 16 between adjacent two partitions is axially symmetrical.

[0076] Specifically, the adjacent first solar cell 18 and second solar cell 19 are formed by cutting the same solar cell A50 in half. Solar cell A50 is preferably a 1 / 2 solar cell, having two sections. The connecting section 16 of the two sections is axially symmetrical, and the axis of symmetry can be referenced... Figure 9 The line shown in F. The connecting column 16 of two adjacent sections of the battery cell A50 is axially symmetrical. After the battery cell A50 is cut in half to form two battery cells 10, rotating one of the battery cells 10 will make the connecting column 16 of the two cells centrally symmetrical.

[0077] In some embodiments, along the length of the photovoltaic module, the photovoltaic module has a first region and a second region; the battery strings in the first region are of a first type, and the battery strings in the second region are of a second type; or, the battery strings in both the first and second regions are of the first type; see reference. Figure 12 The negative terminal of the first type of battery string is connected to the even-numbered column of interconnects, while the negative terminal of the second type of battery string is connected to the odd-numbered column of interconnects.

[0078] The length direction of the photovoltaic module can be referenced. Figures 10 to 12 The direction indicated by arrow X2 in the middle indicates that the first area can be the upper part of the photovoltaic module, which can be referenced from [the image / reference]. Figures 10 to 12The area shown in P1, the second area can be the lower part of the photovoltaic module, the lower part refers to... Figures 10 to 12 The boundary between the upper and lower parts of the area shown in P2 can be the centerline of the photovoltaic module along its width.

[0079] The first type of battery string differs from the second type in that its first cell is 18. The first type of battery string is characterized by having a first cell of type 18. (See reference for details.) Figure 1 and Figure 6 The battery string shown is a second type of battery string where the first battery cell is the second battery cell 19. The second type of battery string can be found in [reference needed]. Figure 7 The battery strings shown are of the first type. When both the battery strings in the first and second regions are of the first type, there is no need to set up battery strings with different structures. During production, there is no need to distinguish between different battery strings, which can greatly improve production efficiency. When there are two types of battery strings in the component, the edge interconnects of the four battery strings at the lead-out hole 30 can be made to be far away from the lead-out hole 30. That is, the four interconnects 20 near the lead-out hole 30 are not led out from the edge connection portion, which can minimize the interference and obstruction of the lead-out hole 30 by the interconnects 20.

[0080] When the negative terminals of both the first type and the second type of battery string face the same direction, the negative terminals of the first type of battery string are in the even-numbered column of interconnects, and the negative terminals of the second type of battery string are in the odd-numbered column of interconnects. For example, refer to... Figure 8 In the battery string of type 1 shown on the left (T1) and type 2 shown on the right (T2), the negative terminals of both are facing upwards. The negative terminals of the type 1 battery string are in the even-numbered column of interconnects, while those of the type 2 battery string are in the odd-numbered column of interconnects. The even-numbered column of interconnects refers to the direction from left to right along the battery string, and interconnect 20 is the even-numbered interconnect. The odd-numbered column of interconnects refers to the direction from left to right along the battery string, and interconnect 20 is the odd-numbered interconnect.

[0081] In some embodiments, refer to Figure 2 and Figure 3 The battery string also includes interconnecting members 20 for connecting multiple battery cells 10 in series. The interconnecting members 20 include a first interconnecting member 21 and a second interconnecting member 22. Along the width direction of the battery string, the first interconnecting member 21 is located near the edge of the battery string and does not overlap with the overlapping area. The edges of the battery cells 10 and the edges of the overlapping areas are typically relatively thin. The fact that the first interconnecting member 21 at the edge does not overlap with the overlapping area means that the first interconnecting member 21 at the edge will not press against the overlapping area, thus preventing the edge of the pressed edge from being prone to microcracks.

[0082] In some embodiments, in the overlapping area, from the back of the photovoltaic module to the front, the second interconnect 22 presses against the cut edge 11, and the cut edge 11 presses against the first non-cut edge 12.

[0083] In some embodiments, the interconnect 20 is a flat solder strip, and the contact between the flat solder strip and the battery cell 10 is a surface-to-surface contact mode, rather than a point-to-surface or line-to-surface contact. This disperses the pressure on the overlapping area, further preventing edge cracking caused by pressure. The interconnect 20 includes a metal core and a coating. The metal core can be a copper core, or a copper-clad aluminum core, etc., and the coating can be a tin alloy, etc.

[0084] In some embodiments, interconnect a connects the (N+1)th battery cell 10 and the Nth battery cell 10. The overlap length between interconnect a and the (N+1)th battery cell 10 is a first length, and the overlap length between interconnect a and the Nth battery cell 10 is a second length, where the first length is greater than the second length. The overlap length between interconnect a and the (N+1)th battery cell 10 is the length of the overlapping portion of interconnect a and the (N+1)th battery cell 10 along the length direction of the battery string. The overlap length between interconnect a and the Nth battery cell 10 is also the length of the overlapping portion of interconnect a and the Nth battery cell 10 along the length direction of the battery string. When interconnect a overlaps with the preceding battery cell by a shorter length and with the following battery cell by a longer length, interconnect a overlaps less at the end of the preceding battery cell, resulting in a smaller slope and undulation of interconnect a in the overlapping area, thus ensuring the connection strength between interconnect a and the end of the preceding battery cell. The length of the overlapping portion can be measured by measuring the length of the portion of interconnect a attached to the preceding and following battery cells.

[0085] In some embodiments, in more than 40% of the overlapping area of ​​the photovoltaic module, the interconnect 20 contacts only the cut edge 11 and not the first non-cut edge 12. Preferably, in more than 50% or all of the overlapping area, the interconnect 20 contacts only the cut edge 11. In this way, the proportion of the first non-cut edge 12 as a bearing edge can be controlled to be relatively large. In non-overlapping areas, such as at the first chamfer 14, the first interconnect 21 can contact the first non-cut edge 12.

[0086] In some embodiments, refer to Figure 13 and Figure 14 The photovoltaic module includes a backsheet with lead-out holes 30. Along the thickness direction of the photovoltaic module, the overlap area between the orthographic projection of the lead-out hole 30 and the solar cell 10 is less than 20% of the area of ​​the lead-out hole 30. The lead-out hole 30 can be circular or elliptical. The photovoltaic module can have both circular and elliptical lead-out holes, and the area of ​​the elliptical lead-out hole is larger than the area of ​​the circular lead-out hole.

[0087] Preferably, the overlap area between the orthographic projection of the lead-out hole 30 and the battery cell 10 is less than 10% of the area of ​​the lead-out hole 30. The overlap area between the orthographic projection of some lead-out holes 30 and the battery cell 10 can be zero. In this embodiment, the overlap area between the orthographic projection of the lead-out hole 30 and the battery cell 10 is small, or even non-overlapping, which can prevent the battery cell 10 from blocking the lead-out hole 30 and avoid electrical interference between the electrodes on the battery cell 10 and the busbar at the location of the lead-out hole 30.

[0088] In some embodiments, refer to Figure 10 and Figure 11 The photovoltaic module includes cell strings A and B arranged along the length of the photovoltaic module. Multiple cells 10 in both strings A and B are overlapped along a first direction. The photovoltaic module has two opposite ends along its length, with the first direction being the direction from one end of the photovoltaic module to the other. Because the arrangement direction of the cells 10 is consistent along the entire length of the photovoltaic module, the extrusion and flow direction of the encapsulant film during lamination is consistent, which can reduce local aggregation of the encapsulant film, reduce the impact of the encapsulant film on the overlapping area, and improve the stability of the interconnection of the cells 10. The overlapping direction refers to the photovoltaic module where the cells 10 are stacked sequentially from top to bottom, with the second cell 10 overlapping the first cell 10, and the third cell 10 overlapping the second cell 10; or the photovoltaic module where the cells 10 are stacked sequentially from bottom to top, with the second cell 10 overlapping the first cell 10, and the third cell 10 overlapping the second cell 10.

[0089] In some embodiments, refer to Figure 10 and Figure 11 The photovoltaic module includes cell strings C and D arranged along the width direction of the photovoltaic module, and the multiple cells 10 in cell strings C and D are arranged in the same overlapping direction. The width direction of the photovoltaic module can be referred to... Figure 10 and Figure 11 The direction indicated by arrow Y2. In the width of the photovoltaic module, the cells 10 of multiple cell strings are arranged in the same direction. This ensures that the extrusion and flow direction of the encapsulant film during lamination is consistent, reducing localized film aggregation, minimizing the impact of the encapsulant film on the overlapping areas, and improving the stability of the interconnection of the cell 10s. The overlapping arrangement direction can be understood as the direction in which the cell 10s are stacked sequentially in the cell string. For example, in a photovoltaic module where cells are stacked sequentially from top to bottom, the second cell 10 overlaps the first cell 10, and the third cell 10 overlaps the second cell 10.

[0090] In some embodiments, the photovoltaic module includes cell strings A and B arranged along the length of the photovoltaic module; the overlapping directions of the multiple cells 10 in cell strings A and B are opposite. In this case, along the length of the photovoltaic module, the encapsulant film is squeezed to the middle busbar position or the edge busbar positions at both ends of the photovoltaic module, that is, the middle and both ends of the photovoltaic module, which can provide better protection and restraint for the encapsulated cells 10.

[0091] In some embodiments, the photovoltaic module includes a battery string C and a battery string D arranged along the width direction of the photovoltaic module, wherein the overlapping arrangement directions of the plurality of battery cells 10 in the battery string C and the battery string D are opposite.

[0092] In some embodiments, refer to Figure 10 and Figure 11 The photovoltaic module consists of an upper part and a lower part, each containing six cell strings. All cell strings in the upper part are connected in parallel. The electrical connections of the cell strings in the lower part are the same as those in the upper part, and the cell strings in the upper and lower parts are connected in series.

[0093] The upper part can be referenced. Figures 10 to 12 The area shown in P1, the second area can be the lower part of the photovoltaic module, the lower part refers to... Figures 10 to 12 The boundary between the upper and lower parts of the area shown in P2 can be the centerline of the photovoltaic module along its width. Figure 11 and Figure 10 The difference is that, Figure 11 Two battery strings arranged along the length of a photovoltaic module form a long battery string.

[0094] In some embodiments, refer to Figure 12 The photovoltaic module consists of an upper part and a lower part. The upper part and the lower part each include 6 battery strings. Battery strings 1 and 2 in the upper part are connected in parallel to form string group 1, battery strings 3 and 4 are connected in parallel to form string group 2, string groups 1 and 2 are connected in series, and battery strings 5 ​​and 6 are connected in parallel and then electrically connected to flat conductors. The electrical connection of the battery strings in the lower part is the same as that in the upper part, and the battery strings in the upper part and the lower part are connected in parallel respectively.

[0095] In this diagram, the direction from the left side of the photovoltaic module to the right, indicated by Y3, shows the following sequence: the upper six battery strings are battery string 1, battery string 2, battery string 3, battery string 4, battery string 5, and battery string 6, and the lower six battery strings are also in the same sequence.

[0096] In some embodiments, refer to Figure 13 and Figure 14The photovoltaic module also includes a conductor A40 extending along the length of the photovoltaic module. Along the width of the photovoltaic module, one side of the conductor A40 has a battery string A and a battery string B. The distance between battery string A and conductor A40 is greater than the distance between battery string B and conductor A40. The distance between battery string B and conductor A40 is 1mm-3mm.

[0097] The conductor A40 connects the two ends of the battery string to carry current. Alternatively, conductor A40 connects the two ends of the battery string in parallel with diodes in the junction box. Two types of conductors A40 with different widths can be used in the same photovoltaic module. Of course, all conductors A40 can also be the same. The width of conductor A40 can be the same as or smaller than the width of the busbar in the middle of the photovoltaic module. In the photovoltaic module, the thickness of each conductor A40 and busbar is generally consistent, with an error typically within 0.1 mm.

[0098] The length direction of the photovoltaic module can be referenced. Figure 13 and Figure 14 The direction shown in X2 indicates the width direction of the photovoltaic module. Figure 13 and Figure 14 The direction is shown in Y2. The distance between battery string B and wire A40 can be 1mm, 1.5mm, 1.8mm, 2mm, 3mm, etc. In this embodiment, the wire A40 is kept away from battery string A and battery string B, thereby reducing the impact of wire A40 on adjacent battery cells 10 and avoiding short circuit problems.

[0099] In some embodiments, refer to Figure 2 The battery cell 10 has an edge connection portion 17, and the head of the interconnect member 20 on the battery cell 10 extends 5.5 mm or less beyond the edge connection portion.

[0100] The edge connection portion 17 is the connection portion near the edge of the battery cell 10 in the connection portion row 16. The distance by which the head of the interconnect member 20 extends beyond the edge connection portion 17 is, along the extension direction of the interconnect member 20, the distance between the end face of the head of the interconnect member 20 and the edge connection portion 17. The head of the interconnect member 20 extends more than 0 mm and less than 5.5 mm beyond the edge connection portion. In this embodiment, while ensuring effective connection between the interconnect member 20 and the edge connection portion 17, it is possible to avoid the interconnect member 20 being too long and interfering with the overlapping area.

[0101] This invention also provides a method for manufacturing photovoltaic modules, the method comprising:

[0102] Provides cell a and cell b;

[0103] The provided battery cell a and battery cell b are cut to obtain four battery cells;

[0104] Rotate the first and third solar cells by 180 degrees, or rotate the second and fourth solar cells by 180 degrees;

[0105] Multiple solar cells are arranged in an overlapping manner; wherein the cut edge of the (N+1)th solar cell overlaps the first non-cut edge of the Nth solar cell.

[0106] Multiple overlapping solar cells are connected in series to form a battery string using interconnecting components.

[0107] In this configuration, the long sides of solar cell a60 and solar cell b70 are opposite each other. Solar cells a60 and b70 are cut in half to obtain four solar cells. The cutting line for solar cell a60 can be referenced... Figure 15 The cut line of cell b70 shown in G1 can be referenced. Figure 15 G2 is shown in the diagram. The four battery cells 10 obtained after cutting have their cut edges 11 facing each other, and their first non-cut edges 12 facing each other. Therefore, rotating the first and third battery cells by 180 degrees, or rotating the second and fourth battery cells by 180 degrees, can make the cut edges 11 and the first non-cut edges 12 face each other. It should be understood that this 180-degree rotation can be horizontal or three-dimensional, around the long side of the battery cell 10.

[0108] The solar cell has a connection array 16, which includes a positive electrode connection array 161 and a negative electrode connection array 162. By rotating the first and third solar cells by 180 degrees, or by rotating the second and fourth solar cells by 180 degrees, the positive electrode connection array 161 of two adjacent solar cells 10 can be aligned with the negative electrode connection array 162 by adjusting the positions of the first, second, third, and fourth solar cells, or the positive electrode connection array 161 of two adjacent solar cells 10 after overlapping can be aligned with the negative electrode connection array 162 by adjusting the order of cell picking.

[0109] When arranging multiple battery cells in an overlapping manner, four cut and rotated battery cells can be taken and overlapped from top to bottom, or from bottom to top, or arranged according to a set order. When arranging four cut battery cells from top to bottom, the first and third battery cells can be rotated. When arranging four cut battery cells from bottom to top, the second and fourth battery cells can be rotated.

[0110] In this embodiment, in the prepared battery string, the cut edge 11 of the (N+1)th battery cell is pressed on the first non-cut edge 12 of the Nth battery cell. That is, the first non-cut edge 12 is pressed. The first non-cut edge 12 has good mechanical properties and passivation properties, and is not prone to microcracks. This can avoid the problem that the pressed edge is prone to microcracks at the overlap of two adjacent battery cells.

[0111] In some embodiments, both battery cell a60 and battery cell b70 have multiple connecting columns 16, and the connecting columns 16 of the upper and lower portions of battery cell a60 and battery cell b70 are axially symmetrical. After battery cell a60 and battery cell b70 are cut, by rotating the first and third battery cells or the second and fourth battery cells, the connecting columns 16 on the subsequent battery cell can be made centrally symmetrical with respect to the preceding battery cell, and the cut edge 11 is opposite to the first non-cut edge 12.

[0112] In some embodiments, after rotating the first and third battery cells by 180 degrees, or after rotating the second and fourth battery cells by 180 degrees and before arranging the multiple battery cells in an overlapping manner, the method further includes: adjusting the positions of the first, second, third, and fourth battery cells so that the positive electrode connection portions of two adjacent battery cells are opposite to the negative electrode connection portions.

[0113] Specifically, after rotating the first and third solar cells by 180 degrees, or rotating the second and fourth solar cells by 180 degrees, if the positive electrode connection array 161 and negative electrode connection array 162 of two adjacent solar cells 10 are directly opposite each other, then the positions of the first, second, third, and fourth solar cells are maintained. After rotation, if the positive electrode connection array 161 and negative electrode connection array 162 of two adjacent solar cells 10 are not opposite each other, then the positions of the first, second, third, and fourth solar cells are adjusted. When adjusting the positions of the first, second, third, and fourth solar cells, except for not rotating the solar cells 10, the positions of the solar cells 10 can be arbitrarily adjusted as long as the series connection requirement is met, so that the cut edge 11 presses against the first non-cut edge 12.

[0114] When arranging multiple battery cells in an overlapping manner, you can either take four battery cells that have been cut, rotated, and repositioned from top to bottom and arrange them in an overlapping manner, or take four battery cells that have been cut, rotated, and repositioned from bottom to top and arrange them in an overlapping manner.

[0115] There are four possible arrangements for the provided A60 and B70 solar cells; please refer to the specific details. Figures 15 to 18 The four arrangement methods are shown. Both cell a60 and cell b70 have a first long side and a second long side. The end of the first long side has a large chamfer, and the end of the second long side has a small chamfer. Figure 15 In the middle, the first long side of the battery cell a60 faces upward, and the second long side of the battery cell a60 is opposite to the first long side of the battery cell b70. Figure 16In the middle, the first long side of the battery cell a60 faces upward, and the second long side of the battery cell a60 is opposite to the second long side of the battery cell b70. Figure 17 In the middle, the second long side of the battery cell a60 faces upward, and the first long side of the battery cell a60 is opposite to the first long side of the battery cell b70. Figure 18 In the middle, the second long side of the battery cell a60 faces upward, and the first long side of the battery cell a60 is opposite to the first long side of the battery cell b70.

[0116] As an example, in the method of overlapping and arranging four battery cells after cutting, rotating, and adjusting their positions from top to bottom, for... Figure 15 The shown battery cells a60 and b70 can rotate the first and third battery cells while maintaining the positions of the first, second, third, and fourth battery cells, thereby obtaining... Figure 19 The four battery cells are shown. For Figure 15 The battery cells a60 and b70 shown can also be rotated, with the first and third cells rotated and the order adjusted to the second cell, the rotated first cell, the fourth cell, and the rotated third cell, thus obtaining... Figure 20 The four battery cells are shown. For Figure 15 The battery cells a60 and b70 shown can also be rotated, and the first and third battery cells can be adjusted to the following order: fourth battery cell, rotated first battery cell, second battery cell, and rotated third battery cell, thus obtaining... Figure 20 The four battery cells shown.

[0117] In the method of arranging four battery cells, after being cut, rotated, and repositioned from top to bottom, in an overlapping manner, for Figure 16 , Figure 17 , Figure 18 The battery cells a60 and b70 shown can be rotated according to the above principle, corresponding to the first and third battery cells, while maintaining or adjusting the positions of the first, second, third, and fourth battery cells, to obtain... Figure 19 or Figure 20 The four battery cells shown.

[0118] As an example, in the method of overlapping and arranging four battery cells after cutting, rotating, and adjusting their positions from bottom to top, for... Figure 15 The battery cells a60 and b70 shown can be rotated to allow the second and fourth battery cells to be rotated, and the order adjusted to the rotated second battery cell, the first battery cell, the rotated fourth battery cell, and the third battery cell, thus obtaining four battery cells. These four battery cells are connected to... Figure 19 The four solar cells have the same structure after being rotated 180 degrees. For Figure 15The shown battery cells a60 and b70 can also rotate to rotate the second and fourth battery cells while maintaining the positions of the first, second, third, and fourth battery cells, thus obtaining four battery cells. These four battery cells are... Figure 20 The four solar cells have the same structure after being rotated 180 degrees. For Figure 15 The battery cells a60 and b70 shown can also be rotated to rotate the second and fourth battery cells, adjusting the order to the third battery cell, the rotated second battery cell, the first battery cell, and the rotated fourth battery cell, thus obtaining four battery cells. These four battery cells are connected to... Figure 20 The four solar cells have the same structure after being rotated 180 degrees.

[0119] This invention also provides a method for manufacturing photovoltaic modules, the method comprising:

[0120] The supplier provides a first incoming material and a second incoming material, wherein the first incoming material includes multiple first solar cells and the second incoming material includes multiple second solar cells, and the first solar cells and the second solar cells are of different types.

[0121] Remove the first and second battery cells, and transfer the first and second battery cells alternately.

[0122] Multiple solar cells are arranged in an overlapping manner during transmission; wherein the cut edge of the (N+1)th solar cell overlaps the first non-cut edge of the Nth solar cell.

[0123] Multiple battery cells are connected in series to form a battery string using interconnecting components.

[0124] The first solar cell 18 and the second solar cell 19 are two types of solar cells 10 required for preparing the solar cell string. When alternating between the first and second solar cells, either the first solar cell 18 or the second solar cell 19 can be transferred first. At this time, there is no need to perform operations such as cutting, rotating, or adjusting the position, which simplifies the cell arrangement operation, reduces the process difficulty, and greatly improves the module manufacturing efficiency.

[0125] In this embodiment, in the prepared battery string, the cut edge 11 of the (N+1)th battery cell is pressed on the first non-cut edge 12 of the Nth battery cell. That is, the first non-cut edge 12 is pressed. The first non-cut edge 12 has good mechanical properties and passivation properties, and is not prone to microcracks. This can avoid the problem that the pressed edge is prone to microcracks at the overlap of two adjacent battery cells.

[0126] In some embodiments, the first and second incoming materials are packaged in two separate containers. In this embodiment, the first and second incoming materials are packaged in two separate containers located in different positions. The type of battery cells taken out of the containers is fixed, eliminating the need to identify the type of battery cells. Furthermore, when a battery cell is damaged, the next battery cell can be directly removed. Compared to in-situ cutting, this significantly reduces the process difficulty and material waste.

[0127] In some embodiments, the first and second incoming materials are contained in the same container. In this embodiment, it is not necessary to use two separate containers to hold the first and second incoming materials. In this case, the materials are mixed, and as long as they are fed in sequence, the alternating arrangement of the first and second incoming materials can be completed.

[0128] In some embodiments, refer to Figure 21 and Figure 22 The first battery cell 18 has a first chamfer 14, and the second battery cell 19 has a second chamfer 15. The length of the first chamfer 14 is greater than the length of the second chamfer 15. The first battery cell 18 and the second battery cell 19 can be identified by the chamfers.

[0129] In some embodiments, the multiple battery cells being transported are arranged in an overlapping manner, including: arranging the multiple battery cells in an overlapping manner such that the cut edges and first non-cut edges of two adjacent battery cells are aligned in the same direction. For example, the cut edges 11 of two adjacent battery cells are both oriented upwards, and the first non-cut edges 12 of two adjacent battery cells are both oriented downwards, thereby making the cut edges 11 and first non-cut edges 12 of two adjacent battery cells opposite each other.

[0130] In some embodiments, removing the first and second battery cells includes:

[0131] The first and second battery cells are identified by their electrode patterns, and then removed.

[0132] The first and second battery cells can be identified by the number of fine grid electrodes connected to the connection portion at the upper left or lower left corner of the cell. Alternatively, they can be identified by other differences in the electrode patterns, such as the different structures of the connection portion at the upper left or lower left corner of the cell itself.

[0133] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0134] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the present invention, and all of these modifications are within the protection scope of the present invention.

Claims

1. A photovoltaic module, characterized by, Includes a battery string, wherein the battery string comprises multiple battery cells arranged in an overlapping manner; The solar cell has a cut edge and a first uncut edge, pointing from the back of the photovoltaic module to the front. The N+1th solar cell in the solar cell string overlaps with the edge of the Nth solar cell, and the cut edge of the N+1th solar cell presses on the first uncut edge of the Nth solar cell. In the battery string, two adjacent battery cells overlap to form an overlapping area. The photovoltaic module has M overlapping areas. At least M / 3 of the overlapping areas, the cut edge presses against the first non-cut edge. N and M are both positive integers. The end of the first non-cut edge is a first chamfer or a second chamfer, and the length of the first chamfer is greater than the length of the second chamfer; In the battery string, battery cells with the first chamfer and battery cells with the second chamfer are arranged alternately, and the first non-cut edge with the first chamfer at the cut edge pressing end and the first non-cut edge with the second chamfer at the cut edge pressing end are arranged alternately.

2. The photovoltaic module of claim 1, wherein, At least M / 2 of the overlapping areas, the cut edge presses against the first non-cut edge; Alternatively, at all the overlapping areas, the cut edge presses against the first non-cut edge; And / or, the multiple battery cells in the battery string are arranged in an overlapping manner.

3. The photovoltaic module of claim 1, wherein, The ends of the cut edge are right angles.

4. The photovoltaic module of claim 1, wherein, The length ratio of the first chamfer to the second chamfer is less than or equal to 8 and greater than 1; Alternatively, the length ratio of the first chamfer to the second chamfer is between 1.12 and 7.

4.

5. The photovoltaic module of claim 1, wherein, From the back of the photovoltaic module to the front, the chamfered portion of the end of the first non-cut edge is covered by the cut edge; and / or, the lengths of the chamfers at both ends of the first non-cut edge covered by the cut edge are not equal.

6. The photovoltaic module according to claim 1, characterized in that, The ratio of the length of the first non-cut edge to the length of the cut edge is greater than or equal to 0.91 and less than 1.

7. The photovoltaic module of claim 1, wherein, In the battery string, the width difference between the (N+1)th battery cell and the Nth battery cell is less than or equal to 1.2 mm.

8. The photovoltaic module of claim 1, wherein, The width of the overlapping area is greater than or equal to 0.2 mm and less than or equal to 1.2 mm.

9. The photovoltaic module of claim 1, wherein, The photovoltaic module also includes a front encapsulant film and a back encapsulant film, wherein the front encapsulant film and / or the back encapsulant film extend into the overlapping area.

10. The photovoltaic module of claim 1, wherein, The solar cell has a plurality of fine grid electrodes, and the number of fine grid electrodes located in one of the overlapping regions is less than or equal to 2.

11. The photovoltaic module of claim 1, wherein, The first side surface of the battery cell at the cut edge location has a first passivation layer.

12. The photovoltaic module of claim 11, wherein, The second side of the battery cell at the first non-cut edge position has a second passivation layer; The thickness of the second passivation layer is greater than the thickness of the first passivation layer; and / or, the number of layers of the second passivation layer is greater than the number of layers of the first passivation layer; And / or, the battery cell further has a second uncut edge adjacent to the cut edge, and on the third side surface of the battery cell at the location of the second uncut edge, an extension of the first passivation layer is located above an extension of the second passivation layer; and / or, the roughness of the second side surface is less than the roughness of the first side surface.

13. The photovoltaic module according to any of claims 1 to 12, characterized in that The battery cell has multiple rows of connection portions for electrical connection with interconnecting components; In the battery string, the plurality of connecting segments in the (N+1)th battery cell are centrally symmetrical with the plurality of connecting segments in the Nth battery cell.

14. The photovoltaic module according to any of claims 1-12, wherein, The battery string includes alternating first and second battery cells, with adjacent first and second battery cells cut from the same battery cell A; The battery cell A is a whole battery cell, a 1 / 2 battery cell, a 1 / 3 battery cell, or a 1 / 4 battery cell; and / or, the battery cell A has at least two partitions, and the connection between two adjacent partitions is axially symmetrical.

15. The photovoltaic module according to any one of claims 1-12, characterized in that, Along the length of the photovoltaic module, the photovoltaic module has a first region and a second region; The battery strings in the first region are of a first type, and the battery strings in the second region are of a second type; or, the battery strings in both the first region and the second region are of the first type. The negative terminal of the first type of battery string is connected to the even-numbered column of interconnects, while the negative terminal of the second type of battery string is connected to the odd-numbered column of interconnects.

16. The photovoltaic module according to any of claims 1-12, wherein, The battery string also includes interconnecting components that connect multiple battery cells in the battery string in series, and the interconnecting components include a first interconnecting component and a second interconnecting component; Along the width direction of the battery string, the first interconnect is close to the edge of the battery string, and the first interconnect does not overlap with the overlapping area; And / or, in the overlapping area, in the direction from the back of the photovoltaic module to the front, the second interconnect is pressed on the cut edge, and the cut edge is pressed on the first uncut edge; and / or, the interconnect is a flat solder strip.

17. The photovoltaic module according to any of claims 1-12, wherein, The battery string also includes an interconnecting member that connects multiple battery cells in the battery string. The interconnecting member a connects the (N+1)th battery cell and the Nth battery cell. The overlap length between the interconnecting member a and the (N+1)th battery cell is a first length, and the overlap length between the interconnecting member a and the Nth battery cell is a second length. The first length is greater than the second length.

18. The photovoltaic module according to any of claims 1-12, wherein, The battery string also includes interconnecting members that connect multiple battery cells in the battery string. In more than 40% of the overlapping area of ​​the photovoltaic module, the interconnecting members only contact the cut edge.

19. The photovoltaic module according to any of claims 1-12, wherein, The photovoltaic module includes a backsheet with lead-out holes. Along the thickness direction of the photovoltaic module, the overlap area between the orthographic projection of the lead-out holes and the solar cells is less than 20% of the area of ​​the lead-out holes.

20. The photovoltaic module according to any one of claims 1-12, characterized in that, The photovoltaic module includes a battery string A and a battery string B arranged along the length of the photovoltaic module, wherein multiple battery cells in the battery string A and the battery string B are arranged in an overlapping manner along a first direction; the photovoltaic module has two opposite ends along the length direction, and the first direction is the direction from one end of the photovoltaic module to the other end. And / or, the photovoltaic module includes a battery string C and a battery string D arranged along the width direction of the photovoltaic module, wherein the overlapping arrangement direction of multiple battery cells in the battery string C and the battery string D is the same.

21. The photovoltaic module of any of claims 1-12, wherein, The photovoltaic module includes a battery string A and a battery string B arranged along the length of the photovoltaic module; the overlapping arrangement of multiple battery cells in the battery string A and the battery string B is in opposite directions; And / or, the photovoltaic module includes a battery string C and a battery string D arranged along the width direction of the photovoltaic module, wherein the overlapping arrangement directions of multiple battery cells in the battery string C and the battery string D are opposite.

22. The photovoltaic module of any of claims 1-12, wherein, The photovoltaic module also includes a conductor A extending along the length of the photovoltaic module, and one side of the conductor A has a battery string A and a battery string B; The distance between battery string A and wire A is greater than the distance between battery string B and wire A, and / or the distance between battery string B and wire A is 1mm-3mm.

23. The photovoltaic module of any of claims 1-12, wherein, The battery string also includes interconnecting components that connect multiple battery cells in the battery string in series; The battery cell has an edge connection portion, and on the battery cell, the head of the interconnecting member extends beyond the edge connection portion by less than 5.5 mm.

24. A method for manufacturing a photovoltaic module, characterized in that, include: Provides cell a and cell b; The provided battery cell a and battery cell b are cut to obtain four battery cells; Rotate the first and third solar cells by 180 degrees, or rotate the second and fourth solar cells by 180 degrees; Multiple battery cells are arranged in an overlapping manner; wherein the cut edge of the (N+1)th battery cell overlaps the first non-cut edge of the Nth battery cell; Multiple overlapping battery cells are connected in series to form a battery string using interconnecting components; Wherein, the end of the first non-cut edge is a first chamfer or a second chamfer, and the length of the first chamfer is greater than the length of the second chamfer; In the battery string, battery cells with the first chamfer and battery cells with the second chamfer are arranged alternately, and the first non-cut edge with the first chamfer at the cut edge pressing end and the first non-cut edge with the second chamfer at the cut edge pressing end are arranged alternately.

25. The method of claim 24, wherein the method further comprises: The long sides of the battery cell a and the battery cell b are opposite each other. Both the battery cell a and the battery cell b have multiple connecting columns, and the connecting columns of the upper and lower parts of the battery cell a and the battery cell b are axially symmetrical.

26. The method of making a photovoltaic assembly of claim 24, wherein, The step of rotating the first and third solar cells by 180 degrees, or rotating the second and fourth solar cells by 180 degrees, before arranging the multiple solar cells in an overlapping manner, further includes: Adjust the positions of the first, second, third, and fourth solar cells so that the positive electrode connection rows of two adjacent solar cells are opposite to the negative electrode connection rows.

27. A method for manufacturing a photovoltaic module, characterized in that, include: The system provides a first incoming material and a second incoming material, wherein the first incoming material includes a plurality of first battery cells and the second incoming material includes a plurality of second battery cells, and the first battery cells and the second battery cells are of different types. Remove the first battery cell and the second battery cell, and transfer the first battery cell and the second battery cell alternately; Multiple battery cells are arranged in an overlapping manner during transmission; wherein the cut edge of the (N+1)th battery cell is pressed against the first non-cut edge of the Nth battery cell. Multiple battery cells are connected in series to form a battery string using interconnecting components; Wherein, the end of the first non-cut edge is a first chamfer or a second chamfer, and the length of the first chamfer is greater than the length of the second chamfer; The first non-cut edge of the first battery cell is the first chamfer, and the first non-cut edge of the second battery cell is the second chamfer; the first non-cut edge with the first chamfer at the cut edge pressing end and the first non-cut edge with the second chamfer at the cut edge pressing end are arranged alternately.

28. The method of making a photovoltaic assembly of claim 27, wherein, The first and second incoming materials are packaged in two separate containers.

29. The method of making a photovoltaic assembly of claim 27, wherein, The first and second incoming materials are contained in the same container.

30. The method of making a photovoltaic assembly of claim 27, wherein, The overlapping arrangement of the multiple battery cells during transmission includes: Multiple solar cells are arranged in an overlapping manner so that the cut edges of two adjacent solar cells and the first uncut edge are aligned in the same direction.

31. The method of making a photovoltaic assembly of claim 29, wherein, The step of removing the first battery cell and the second battery cell includes: The first and second battery cells are identified by their electrode patterns, and then the first and second battery cells are removed.

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