Photovoltaic module and photovoltaic module preparation method

Abstract

The invention discloses a photovoltaic module and a preparation method thereof. The photovoltaic module comprises a battery string, and the battery string comprises a plurality of battery pieces which are arranged in an overlapped manner and an interconnection piece which is connected with the plurality of battery pieces in series; each battery piece is provided with a cutting edge and a first non-cutting edge which are opposite to each other, the edge of the (N + 1) th battery piece and the edge of the Nth battery piece in the battery string are overlapped in the direction from the back face of the photovoltaic module to the front face of the photovoltaic module, and the first non-cutting edge of the (N + 1) th battery piece is pressed on the cutting edge of the Nth battery piece; in the overlapping area, the first non-cutting edge is located between the interconnecting piece and the cutting edge in the thickness direction of the photovoltaic module. In the embodiment of the invention, the first non-cutting edge in contact with the interconnection piece is not easy to damage.

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, the pressure generated during hot-press welding or mechanical assembly will be concentrated on the overlapping area of ​​the battery cells, especially at the contact point between the welding strip and the battery cells, which will make the overlapping edge in contact with the welding strip easily damaged. 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 overlapping edge in contact with the solder strip is easily damaged in mid-cell modules.

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

[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 first uncut edge of the N+1th solar cell presses on the cut edge of the Nth solar cell, where N is a positive integer.

[0007] In the battery string, two adjacent battery cells overlap to form an overlapping area. In the overlapping area, along the thickness direction of the photovoltaic module, the first uncut edge is located between the interconnect and the cut edge.

[0008] In this embodiment of the invention, the first non-cut edge of the N+1th battery cell is pressed on the cut edge of the Nth battery cell. In the overlapping area, the first non-cut edge is located between the interconnect and the cut edge. That is, in the overlapping area, the first non-cut edge is in contact with the interconnect. The edge of the first non-cut edge is relatively smooth and has a better passivation effect, which makes it less likely to damage the surface protective layer of the interconnect. This can prevent the battery cell from failing due to the migration of metal elements into the battery cell caused by the contact between the interconnect and the cut edge.

[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 given 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 The provided diagram shows the structure of the battery cells in the battery string section.

[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 terminals of the first type of battery string and the second type of battery string in a photovoltaic module provided for embodiments 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, 171-First edge connecting part, 172-Second 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 discloses a photovoltaic module, including multiple battery strings connected in series and parallel. The battery strings are electrically connected via busbars. The number of battery strings in the upper part of the module can be odd or even. When the number of battery strings is odd, an additional wire 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 and interconnecting elements 20 that connect the multiple battery cells 10 in series. 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 and the Nth battery cell 10 overlap, and the first uncut edge 12 of the (N+1)th battery cell 10 presses on the cut edge 11 of the Nth battery cell. N is a positive integer. Two adjacent battery cells 10 overlap to form an overlapping area. In the overlapping area, along the thickness direction of the photovoltaic module, the first uncut edge 12 is located between the interconnecting element 20 and the cut edge 11.

[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 2 Y1 is shown in the figure.

[0040] The first non-cut edge 12 of the N+1th solar cell 10 presses on the cut edge 11 of the Nth solar cell 10, meaning that the first non-cut edge 12 of the N+1th solar cell 10 overlaps with the cut edge 11 of the Nth solar cell 10, and is located on the side of the cut edge 11 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.

[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 first non-cut edge 12 of the (N+1)th battery cell 10 presses on the cut edge 11 of the Nth battery cell. In the overlapping area, the first non-cut edge 12 is located between the interconnect 20 and the cut edge 11. That is, in the overlapping area, the first non-cut edge 12 is in contact with the interconnect 20. The edge of the first non-cut edge 12 is relatively smooth and has good passivation performance, which makes it less likely to damage the surface protective layer of the interconnect 20. This can prevent the failure of the battery cell 10 caused by the migration of metal elements into the interior of the battery cell 10 due to the contact between the interconnect 20 and the cut edge 11.

[0044] Reference Figure 2 In the overlapping area, the interconnect 20 contacts the first non-cut edge 12 but not the cut edge 11. It should be understood that the interconnect 20 does not contact the side surface of the cut edge 11 in the overlapping area. Preferably, the interconnect 20 does not contact the edge of the cut edge 11 within 0.1 mm of its edge to avoid the influence of metal particle migration over a small distance on the side surface of the cut edge 11.

[0045] In some embodiments, multiple battery cells 10 in a battery string are arranged in an overlapping manner. This simplifies the manufacturing process of the battery string, and since multiple batteries 10 in the battery string have one end under pressure and the other end on top, the stress conditions are basically the same, which can avoid some battery cells 10 from cracking due to excessive local stress.

[0046] In some embodiments, the photovoltaic module has M overlapping regions, and the interconnect 20 is located on the first non-cut edge 12 at at least M / 3 overlapping regions, or the interconnect 20 is located on the first non-cut edge 12 at at least M / 2 overlapping regions; M is a positive integer and is greater than or equal to 2.

[0047] If the number of cells in a single cell string is x, and the number of overlapping areas is x-1, and the photovoltaic module has K cell strings, then the total number M of overlapping areas in the photovoltaic module is equal to K×(x-1). In this embodiment, the proportion of the interconnect 20 located on the first non-cut edge 12 is further increased, and the probability of damage to the surface of the interconnect 20 is further reduced, ensuring that most of the edges in the photovoltaic module that are in contact with the interconnect 20 are not easily damaged.

[0048] Preferably, at all overlapping areas, the interconnecting element 20 is located on the first non-cut edge 12.

[0049] 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, and the length of the first chamfer 14 is greater than the length of the second chamfer 15.

[0050] In this embodiment, 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. The first chamfer 14 and the second chamfer 15 can be beveled chamfers. In this embodiment, the end of the cut edge 11 is a right angle, and the end of the first non-cut edge 12 is a chamfer. During the production process, it is easier to quickly distinguish the cut edge 11 and the first non-cut edge 12 based on the right angle and chamfer, which facilitates the adjustment of the direction and arrangement of the battery cells 10.

[0051] In some embodiments, the battery string includes alternating first battery cells 18 and second battery cells 19; the end of the first uncut edge 12 of the first battery cell 18 is a first chamfer 14, and the end of the first uncut edge 12 of the second battery cell 19 is a second chamfer 15. Preferably, all battery strings in the photovoltaic module are designed identically, each including alternating first battery cells 18 and second battery cells 19.

[0052] In this configuration, along the direction from the beginning to the end of the battery string, the first cell 10 in the string can be either the first cell 18 or the second cell 19, and the first and second cells are arranged alternately. In this way, cells with large chamfers (cells 10 with the first chamfer 14) and cells with small chamfers (cells 10 with the second chamfer 15) can be evenly distributed in the photovoltaic module, which helps to reduce current mismatch and current loss of the cells 10.

[0053] In some embodiments, the length ratio of the first chamfer 14 to the second chamfer 15 is between 1.12 and 7.4.

[0054] 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. 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.

[0055] In some embodiments, the reference Figure 2 and Figure 3 From the back of the photovoltaic module towards the front, the chamfered middle portion of the first non-cut edge 12 overlaps with the edge of the cut edge 11. Specifically, the chamfered middle portion of the first non-cut edge 12 is located between the two vertices of the chamfer. More precisely, it is the middle portion of the second chamfer 15 at the end of the first non-cut edge 12 that overlaps with the edge of the cut edge 11. The overlap position of the chamfer and the cut edge 11 can be used to quickly identify whether the overlap between the solar cells 10 meets the standards. It should be noted that the chamfered middle portion mainly refers to the middle third of the chamfer edge, from front to back.

[0056] In some embodiments, refer to Figure 3 One vertex of the chamfer at the end of the first non-cut edge 12 overlaps with the previous battery cell 10. Specifically, one vertex of the first chamfer 14 at the end of the first non-cut edge 12 overlaps with the previous battery cell 10. In this way, good and defective products can be quickly identified in the process based on the exposed (non-overlapping) chamfer portion of the first chamfer.

[0057] In some embodiments, the chamfers at both ends of the first non-cut edge 12 overlap with the cut edge 11 by different lengths. In this embodiment, when the overlap dimensions of 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] If the length of the first non-cutting edge 12 with the first chamfer 14 is less than the length of the first non-cutting edge 12 with the second chamfer 15, then the ratio of the length of the first non-cutting edge 12 with the first chamfer 14 to the length of the cutting edge 11 is less than the ratio of the length of the first non-cutting edge 12 with the second chamfer 15 to the length of the cutting edge 11. The ratio of the length of the first non-cutting edge 12 with the first chamfer 14 to the length of the cutting edge 11 can be 0.948, and the ratio of the length of the first non-cutting edge 12 with the second chamfer 15 to the length of the cutting edge 11 can be 0.98.

[0062] The overlapping area formed when the first non-cutting edge 12 of the first chamfer 14 presses against the cutting edge 11 is referenced. Figure 4 The overlapping area formed when the first non-cutting edge 12 of the second chamfer 15 presses against the cutting edge 11, as shown in the figure, is referenced. Figure 5 As shown in R2, the endpoint positions of the two overlapping regions are different. The length of the first non-cut edge 12 with the first chamfer 14 at the end is different from the length of the first non-cut edge 12 with the second chamfer 15 at the end. By controlling the length of the first non-cut edge 12, the chamfer can be controlled to be relatively small, thereby maximizing the effective area of ​​the battery cell 10.

[0063] In some embodiments, the solar cell 10 has a plurality of fine grid electrodes; the overlapping regions do not overlap with the fine grid electrodes. The fine grid electrodes protrude from the solar cell body. If there are a large number of fine grid electrodes in the overlapping regions, it will lead to local stress concentration in the overlapping regions (where fine grid electrodes are located). In this embodiment, the number of fine grid electrodes in an overlapping region is 0, which can avoid local stress concentration in the overlapping regions and local compression of the solar cell 10 by the fine grid electrodes, reducing the risk of microcracks. It should be understood that this embodiment allows for process errors. For example, in a photovoltaic module, most overlapping regions may not have fine grid electrodes. If individual fine grid electrodes are located in the overlapping regions, this is a process error and is still within the scope of this embodiment.

[0064] 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.

[0065] In some embodiments, the first side of the battery cell 10 at the location of the first uncut edge 12 has a first passivation layer.

[0066] The solar cell 10 has four sides, with the first side corresponding to the first uncut edge 12. 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 first uncut edge 12. 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 further protects the first side and prevents 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 cut edge 11 has a second passivation layer; the thickness of the first passivation layer is greater than the thickness of the second passivation layer; and the number of layers of the first passivation layer is greater than the number of layers of the second passivation layer.

[0068] The second side is the side of the battery cell 10 corresponding to the cut edge 11. The battery cell 10 is cut from the battery cell A50. During the manufacturing process of the battery cell A50, passivation layers are formed on its four sides. The first passivation layer on the first side of the battery cell 10 formed by cutting the battery cell A50 is formed during the manufacturing process of the battery cell A50, while the second passivation layer on the second side is set separately later. The first passivation layer at the position of the first non-cut edge 12 is thicker or has more layers, which is beneficial to improve the protection of the first side. Combined with the small roughness and no damage to the first side, it can further reduce the risk of damage to the surface protection of the interconnect 20 and the migration of metal particles into the battery cell 10.

[0069] In some embodiments, refer to Figure 1The 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 of the second passivation layer is located above the extension of the first passivation layer.

[0070] The second uncut edge 13 is the original short side of the battery cell 10 that has not undergone cutting, and the third side is the side of the battery cell 10 corresponding to the second uncut edge 13. The first passivation layer and the second passivation layer extend to the third side during their formation. On the third side, the extension and superposition of the first and second passivation layers ensure that the passivation layers on the first side (uncut surface) and the second side (cut surface) have sufficient coverage.

[0071] In some embodiments, the roughness of the first side surface is less than that of the second side surface. Specifically, the first side surface is a polished surface, which is less likely to damage the surface layer of the interconnect 20, thus less likely to puncture the protective layer of the interconnect 20, such as the tin alloy layer on the solder ribbon surface, and less likely to expose the metal core. The second side surface is a damaged surface. The damaged surface has numerous sharp protrusions and burrs.

[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 Figures 6 to 9The 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 A; 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; and / or, the battery cell A50 has at least two partitions, with the connecting columns 16 of adjacent two partitions being 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. The negative terminal of the first type of battery string is an even-numbered column of interconnects, and the negative terminal of the second type of battery string is an 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 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.

[0079] The first type of battery string differs from the second type in that its first cell is the same as the second cell (19). The first type of battery string can be found by referring to... Figure 1 and Figure 6 The battery string shown is a second type of battery string where the first battery cell is the first battery cell 18. The second type of battery string can be found in [reference needed]. Figure 7The 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, 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.

[0082] In some embodiments, refer to Figure 1 The interconnecting element 20 includes a first interconnecting element 21. Along the width direction of the battery string, the first interconnecting element 21 is close to the edge of the battery string and does not overlap with the overlapping area. The edge of the battery cell 10 and the edge of the overlapping area are usually relatively thin. The first interconnecting element 21 at the edge does not overlap with the overlapping area, that is, the first interconnecting element 21 at the edge will not press on the overlapping area, which can avoid the edge of the pressed edge being prone to microcracks.

[0083] In some embodiments, in the battery string, the first interconnecting member 21 is used to connect the N1th battery cell and the N1+1th battery cell, where N1 is an odd or even number; in the battery string, the interconnecting member 20 connecting the N1th battery cell and the N1+1th battery cell further includes a second interconnecting member 22, the first interconnecting member 21 has a first bend, the second interconnecting member 22 has a second bend, and the first bend and the second bend are not collinear along the width direction of the battery string.

[0084] In this configuration, both the first and second bends are bent from the back of the photovoltaic module toward the front. When the first and second bends are not collinear, this disperses the pressure points of the interconnect 20 on the edges of the solar cells 10 near the overlapping area, preventing excessive tension caused by all pressure points being collinear.

[0085] In some embodiments, the distance d between the first bend and the second bend along the length of the battery string is 0.2mm-3mm. The distance between the first bend and the second bend can be 0.2mm, 0.5mm, 1mm, 2mm, 3mm, etc. If the distance is too large, the difference between the edge and the middle of the battery cell 10 will be large, which will reduce the manufacturing difficulty and the light-receiving area. If the distance is too small, the force distribution will be weakened. When the distance is within the above range, the pressure on the interconnect 20 can be better distributed, while reducing the manufacturing difficulty.

[0086] In some embodiments, refer to Figure 2 The battery cell 10 has a first edge connecting portion 171 near the first uncut edge 12 and a second edge connecting portion 172 near the cut edge 11. At the overlapping area, the distance between the second edge connecting portion 172 of the preceding battery cell 10 and the first edge connecting portion 171 of the following battery cell 10 is L. Along the length direction of the battery string, the distance d between the first bend and the second bend is 2%L-30%L. Near the bend, the interconnecting member 20 has a certain degree of slope and inclination to transition from a higher position to a lower one.

[0087] In this battery string, the Nth overlapping region is located between the second edge connection portion 172 of the Nth battery cell 10 and the first edge connection portion 171 of the (N+1)th battery cell. The distance between the second edge connection portion 172 of the preceding battery cell 10 and the first edge connection portion 171 of the following battery cell 10 is L, that is, the distance between the second edge connection portion 172 of the Nth battery cell 10 and the first edge connection portion 171 of the (N+1)th battery cell 10 is L. The distance L between the second edge connection portion 172 of the preceding battery cell 10 and the first edge connection portion 171 of the following battery cell 10 can be referred to... Figure 2 The markings in the diagram are as follows. L can be 7mm-20mm. The distance d between the first bend and the second bend can be 2%L, 5%L, 10%L, 15%L, 20%L, 30%L, etc. This design ensures that the bending effect of the two bends of the interconnect 20 is small, and that the bends are at a large distance from the edge connection portions 17 of the front and rear battery cells 10, thus avoiding any impact on the connection between the interconnect 20 and the edge connection portions 17 caused by bending or warping of the interconnect 20.

[0088] In some embodiments, the battery string further includes interconnecting members 20 that connect multiple battery cells 10 in series. Interconnecting member a connects the (N+1)th battery cell 10 and the Nth battery cell 10. The overlap length between interconnecting member a and the (N+1)th battery cell 10 is a first length, and the overlap length between interconnecting member 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 interconnecting member a and the (N+1)th battery cell 10 is the length of the overlapping portion along the length direction of the battery string. The overlap length between interconnecting member a and the Nth battery cell 10 is also the length of the overlapping portion along the length direction of the battery string. When interconnecting member a overlaps with a preceding battery cell by a shorter length and with a following battery cell by a longer length, the overlap of interconnecting member a at the end of the preceding battery cell is less, resulting in a smaller slope and undulation of interconnecting member a in the overlapping area, thus ensuring the connection strength between interconnecting member a and the end of the preceding battery cell. In calculating the length of the overlapping portion, the length of the portion of the interconnect a attached to the front and rear battery cells can be measured.

[0089] 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.

[0090] 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.

[0091] In some embodiments, refer to Figure 10 and Figure 11 A photovoltaic module includes cell strings A and B arranged along its length. Multiple cells in both strings A and B are arranged in an overlapping manner along a first direction. The photovoltaic module has two opposite ends along its length, where the first direction is the direction from one end of the photovoltaic module to the other. The length direction of the photovoltaic module can be referenced... Figure 11 and Figure 12The direction indicated by arrow X2. Because the arrangement direction of the solar cells 10 is consistent along the entire length of the photovoltaic module, the compression 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 solar cells 10. The overlapping direction mentioned here refers to the photovoltaic module where the solar cells 10 are stacked sequentially from top to bottom, with the second solar cell 10 overlapping the first solar cell 10, and the third solar cell 10 overlapping the second solar cell 10; or the photovoltaic module where the solar cells 10 are stacked sequentially from bottom to top, with the second solar cell 10 overlapping the first solar cell 10, and the third solar cell 10 overlapping the second solar cell 10.

[0092] In some embodiments, refer to Figure 10 and Figure 11 A photovoltaic module includes cell strings C and D arranged along the width of the module. The cells in cell strings C and D are arranged in the same overlapping direction. The width direction of the photovoltaic module can be referenced... Figure 11 and Figure 12 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.

[0093] In some embodiments, the photovoltaic module includes cell strings A and B arranged along the length of the photovoltaic module; the overlapping arrangement directions of the multiple cells 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.

[0094] 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 multiple cells in the battery string C and the battery string D are opposite.

[0095] 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.

[0096] The upper part can be referenced. Figures 10 to 11The area shown in P1, the second area can be the lower part of the photovoltaic module, the lower part refers to... Figures 10 to 11 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.

[0097] 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.

[0098] 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.

[0099] In some embodiments, refer to Figure 13 and Figure 14 The photovoltaic module also includes a conductor A40 extending along the length of the photovoltaic module. One side of conductor A40 has a cell string A and a cell string B. The distance between cell string A and conductor A40 is greater than the distance between cell string B and conductor A, and the distance between cell string B and conductor A40 is 1mm-3mm. Conductor A40 connects the two ends of the cell string for current transmission. Alternatively, conductor A40 connects the two ends of the cell string in parallel with diodes in the junction box. Two types of conductor A40 with different widths can be used in the same module. Alternatively, all conductors A40 can 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. The thickness of each conductor A40 and busbar in the module is generally consistent, with an error typically within 0.1mm.

[0100] 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 14The 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.

[0101] This invention also provides a method for manufacturing photovoltaic modules, 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 resulting battery cells, after cutting, have cut edges 11 facing each other, and first non-cut edges 12 facing each other. Therefore, the first and third battery cells are rotated 180 degrees, or the second and fourth battery cells are rotated 180 degrees, so that cut edges 11 and first non-cut edges 12 are opposite 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 second and fourth battery cells can be rotated. When arranging four cut battery cells from bottom to top, the first and third battery cells can be rotated.

[0110] In this embodiment, in the prepared battery string, the first non-cut edge 12 of the (N+1)th battery cell 10 presses against the cut edge 11 of the Nth battery cell. In the overlapping region, the first non-cut edge 12 is located between the interconnect 20 and the cut edge 11. That is, in the overlapping region, the first non-cut edge 12 is in contact with the interconnect 20. The first non-cut edge 12 has good mechanical properties and passivation properties, therefore, the first non-cut edge 12 in contact with the interconnect 20 is not easily damaged. In addition, the edge of the first non-cut edge 12 is relatively smooth, making it less likely to damage the surface layer of the interconnect 20. Furthermore, it can prevent the failure of the battery cell 10 caused by the migration of metal elements into the interior of the battery cell 10 due to the contact between the interconnect 20 and the cut edge 11.

[0111] In some embodiments, both battery cell a and battery cell b have multiple connecting columns 16, and the connecting columns 16 of the upper and lower portions within 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 can be 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 array of two adjacent battery cells is opposite to the negative electrode connection array.

[0113] Specifically, if the positive electrode connection array 161 and negative electrode connection array 162 of two adjacent battery cells 10 are directly opposite each other after rotating the first and third battery cells 10, then the positions of the first, second, third, and fourth battery cells are maintained. If, after rotation, the positive electrode connection array 161 and negative electrode connection array 162 of two adjacent battery cells 10 are not opposite each other, then the positions of the first, second, third, and fourth battery cells are adjusted. When adjusting the positions of the first, second, third, and fourth battery cells, the positions of the battery cells 10 can be arbitrarily adjusted as long as the series connection requirement is met, thus achieving the connection between the cut edge 11 and 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 following for 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 16 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 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 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, thereby obtaining... Figure 19 The four battery cells are shown. For Figure 15 The shown battery cells a60 and b70 can also rotate the second and fourth battery cells while maintaining the positions of the first, second, third, and fourth battery cells, thereby obtaining... Figure 20 The four battery cells are shown. For Figure 15The battery cells a60 and b70 shown can also be rotated to rotate the second and fourth battery cells, and the order can be adjusted to the third battery cell, the rotated second battery cell, the first battery cell, and the rotated fourth battery cell, thereby 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 to rotate the second and fourth battery cells, while maintaining or adjusting the positions of the first, second, third, and fourth battery cells, thus obtaining... 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 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, thus obtaining four battery cells. These four battery cells are... Figure 19 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 first and third battery cells, adjusting the order to the second battery cell, the rotated first battery cell, the fourth battery cell, and the rotated third battery cell, thus obtaining four battery cells. These four battery cells are then combined with… 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 first and third battery cells, and adjust the order to the fourth battery cell, the rotated first battery cell, the second battery cell, and the rotated third battery cell, thus obtaining four battery cells. These four battery cells are connected with... 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, 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 first non-cut edge 12 of the (N+1)th battery cell 10 presses against the cut edge 11 of the Nth battery cell. In the overlapping region, the first non-cut edge 12 is located between the interconnect 20 and the cut edge 11. That is, in the overlapping region, the first non-cut edge 12 is in contact with the interconnect 20. The first non-cut edge 12 has good mechanical properties and passivation properties, therefore, the first non-cut edge 12 in contact with the interconnect 20 is not easily damaged. In addition, the edge of the first non-cut edge 12 is relatively smooth, making it less likely to damage the surface layer of the interconnect 20. Furthermore, it can prevent the failure of the battery cell 10 caused by the migration of metal elements into the interior of the battery cell 10 due to the contact between the interconnect 20 and the cut edge 11.

[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 first non-cut edges 12 of two adjacent battery cells are both oriented upwards, and the cut edges 11 of two adjacent battery cells are both oriented downwards, thereby making the cut edges 11 of two adjacent battery cells opposite to the first non-cut edges 12.

[0130] In some embodiments, removing the first and second battery cells includes: identifying the first and second battery cells by means of the electrode patterns of the battery cells, and removing the first and second battery cells.

[0131] 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.

[0132] 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.

[0133] 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 in that, It includes a battery string, which comprises multiple battery cells arranged in an overlapping manner and an interconnecting element that connects the multiple battery cells in series; 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 first uncut edge of the N+1th solar cell presses on the cut edge of the Nth solar cell, where N is a positive integer. In the battery string, two adjacent battery cells overlap to form an overlapping area. In the overlapping area, along the thickness direction of the photovoltaic module, the first uncut edge is located between the interconnect and the cut edge.

2. The photovoltaic module according to claim 1, characterized in that, In the overlapping area, the interconnecting member contacts the first non-cut edge and does not contact the surface within 0.1 mm of the cut edge edge, and / or, multiple battery cells in the battery string are arranged in an overlapping manner.

3. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module has M overlapping regions. At least M / 3 of the overlapping regions, the interconnect is located on the first non-cut edge, or at least M / 2 of the overlapping regions, the interconnect is located on the first non-cut edge; M is a positive integer.

4. The photovoltaic module according to claim 1, characterized in that, The ends of the cut edges are right angles; and / or, The first non-cut edge has a first chamfer or a second chamfer at the end, and the length of the first chamfer is greater than the length of the second chamfer.

5. The photovoltaic module according to claim 4, characterized in that, The battery string includes alternating first and second battery cells; The end of the first uncut edge of the first battery cell is the first chamfer, and the end of the first uncut edge of the second battery cell is the second chamfer.

6. The photovoltaic module according to claim 4, characterized in that, The length ratio of the first chamfer to the second chamfer is between 1.12 and 7.

4.

7. The photovoltaic module according to claim 4, characterized in that, From the back of the photovoltaic module toward the front, the chamfered middle of the first uncut edge overlaps with the edge of the cut edge; and / or, one vertex of the chamfered corner of the first uncut edge overlaps with the previous cell.

8. The photovoltaic module according to claim 1, characterized in that, 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 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.

10. The photovoltaic module according to claim 1, characterized in that, The battery cell has a plurality of fine grid electrodes; the overlapping region does not overlap with the fine grid electrodes.

11. The photovoltaic module according to claim 1, characterized in that, 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.

12. The photovoltaic module according to claim 1, characterized in that, The battery cell has a first passivation layer on its first side surface at the first non-cut edge position.

13. The photovoltaic module according to claim 12, characterized in that, The second side surface of the battery cell at the cut edge location has a second passivation layer; The thickness of the first passivation layer is greater than the thickness of the second passivation layer; And / or, the number of the first passivation layer is greater than the number of the second passivation layer; And / or, the battery cell also 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, the extension portion of the second passivation layer is located above the extension portion of the first passivation layer; And / or, the roughness of the first side is less than the roughness of the second side.

14. The photovoltaic module according to claim 1, characterized in that, 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 1-14, 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 claim 1, characterized in that, The interconnecting element includes a first interconnecting element along the width direction of the battery string, the first interconnecting element being close to the edge of the battery string, and the first interconnecting element not overlapping with the overlapping area; And / or, the interconnect is a flat solder strip.

17. The photovoltaic module according to claim 16, characterized in that, In the battery string, the first interconnecting member is used to connect the N1th battery cell and the (N1+1)th battery cell, where N1 is an odd or even number; In the battery string, the interconnecting member connecting the N1th battery cell and the N1+1th battery cell further includes a second interconnecting member. The first interconnecting member has a first bent portion, and the second interconnecting member has a second bent portion. Along the width direction of the battery string, the first bent portion and the second bent portion are not collinear.

18. The photovoltaic module according to claim 17, characterized in that, Along the length of the battery string, the distance d between the first bent portion and the second bent portion is 0.2mm-3mm; And / or, the battery cell has a first edge connection portion near the first uncut edge and a second edge connection portion near the cut edge, and at the overlapping area, the distance between the second edge connection portion of the preceding battery cell and the first edge connection portion of the following battery cell is L, and along the length direction of the battery string, the distance d between the first bent portion and the second bent portion is 2%L-30%L.

19. The photovoltaic module according to claim 1, characterized in that, 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.

20. The photovoltaic module according to claim 1, characterized in that, 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.

21. The photovoltaic module according to claim 1, 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.

22. The photovoltaic module according to claim 1, characterized in that, 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.

23. The photovoltaic module according to claim 1, characterized in that, 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.

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.

25. The method for preparing a photovoltaic module according to claim 24, characterized in that, 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 rows of connecting parts, and the rows of connecting parts in the upper and lower parts of the battery cell a and the battery cell b are axially symmetrical.

26. The method for preparing a photovoltaic module according to claim 24, characterized in that, Before arranging the multiple battery cells in an overlapping manner after rotating the first and third battery cells by 180 degrees, or after rotating the second and fourth battery cells by 180 degrees, the method 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 devices.

28. The method for preparing a photovoltaic module according to claim 27, characterized in that, The first and second incoming materials are packaged in two separate containers.

29. The method for preparing a photovoltaic module according to claim 27, characterized in that, The first and second incoming materials are contained in the same container.

30. The method for preparing a photovoltaic module according to claim 27, characterized in that, The first battery cell has a first chamfer, and the second battery cell has a second chamfer, wherein the length of the first chamfer is greater than the length of the second chamfer.

31. The method for preparing a photovoltaic module according to claim 27, characterized in that, 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.

32. The method for preparing a photovoltaic module according to claim 29, characterized in that, The step of removing the first battery cell and the second battery cell includes: The first and second battery cells are identified by the electrode patterns of the battery cells, and the first and second battery cells are then removed.

Images