Photovoltaic module and photovoltaic module preparation method

Abstract

The invention discloses a photovoltaic module and a photovoltaic module preparation method, the photovoltaic module comprises a battery string, and the battery string comprises a plurality of battery pieces which are arranged in an overlapping manner; 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 cutting edge of the (N + 1) th battery piece is pressed on the first non-cutting edge of the Nth battery piece. In the embodiment of the invention, the cutting edge of the (N + 1) th battery piece is pressed on the first non-cutting edge of the Nth battery piece, namely, the first non-cutting edge is pressed, and the first non-cutting edge is relatively good in mechanical performance and passivation performance and not easy to crack.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic technology, in particular to a photovoltaic module and a photovoltaic module preparation method. BACKGROUND

[0002] In the laminated module, the battery pieces are arranged in stacks and connected into a battery string through a welding strip, so as to arrange more battery pieces in a limited area, improve the utilization of space area and the power generation of the module.

[0003] However, at the overlapping position of the two adjacent battery pieces, the pressed edge is prone to hidden cracks due to the pressure generated in the hot-press welding or mechanical assembly process. SUMMARY

[0004] The present application provides a photovoltaic module and a photovoltaic module preparation method, aiming to at least solve the technical problem that the pressed edge is prone to hidden cracks at the overlapping position of the two adjacent battery pieces in the laminated module.

[0005] The present application provides a photovoltaic module, comprising a battery string, the battery string comprising a plurality of battery pieces arranged in stacks;

[0006] The battery piece has opposite cutting edges and a first non-cutting edge, and the direction from the back surface to the front surface of the photovoltaic module, the N+1th battery piece in the battery string overlaps with the Nth battery piece at the edge, and the cutting edge of the N+1th battery piece is pressed on the first non-cutting edge of the Nth battery piece.

[0007] The overlapping area is formed by the overlapping of the two adjacent battery pieces in the battery string, the photovoltaic module has M overlapping areas, and at least M / 3 overlapping areas, the cutting edge is pressed on the first non-cutting edge, and N and M are positive integers.

[0008] In the present application, the cutting edge of the N+1th battery piece is pressed on the first non-cutting edge of the Nth battery piece, that is, the first non-cutting edge is pressed, the mechanical properties and passivation properties of the first non-cutting edge are good, and the hidden cracks are not prone to occur, which can avoid the problem that the pressed edge is prone to hidden cracks at the overlapping area of the Nth and N+1th battery pieces. And at least M / 3 overlapping areas, the cutting edge is pressed on the first non-cutting edge, at this time, the bottom layer of the more overlapping areas in the entire photovoltaic module has good supporting performance, which can support the entire photovoltaic module from multiple points, thereby reducing the pressure borne by the weak overlapping area, and improving the overall anti-hidden crack performance of the photovoltaic module.

[0009] The above description is only a summary of the technical solutions of the present application, in order to make the technical means of the present application more clearly understood, the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 Part structure schematic diagram of the first type of cell string in the photovoltaic module provided by the embodiment of the present application;

[0011] Figure 2 For Figure 1 Enlarged schematic diagram at A in the figure;

[0012] Figure 3 For Figure 1 Enlarged schematic diagram at B in the figure;

[0013] Figure 4 For Figure 1 Enlarged schematic diagram at C in the figure;

[0014] Figure 5 For Figure 1 Enlarged schematic diagram at D in the figure;

[0015] Figure 6 For Figure 1 Structure schematic diagram of part of the cell pieces in the cell string provided by the present application;

[0016] Figure 7 Part structure schematic diagram of the second type of cell string in the photovoltaic module provided by the embodiment of the present application;

[0017] Figure 8 Structure schematic diagram of the negative lead-out end of the first type of cell string and the second type of cell string in the photovoltaic module provided by the embodiment of the present application;

[0018] Figure 9 Structure schematic diagram of a cell piece A provided by the embodiment of the present application;

[0019] Figure 10 Brief schematic diagram of a photovoltaic module provided by the embodiment of the present application;

[0020] Figure 11 Brief schematic diagram of another photovoltaic module provided by the embodiment of the present application;

[0021] Figure 12 Brief schematic diagram of still another photovoltaic module provided by the embodiment of the present application;

[0022] Figure 13 Structure schematic diagram of a lead-out hole in the photovoltaic module provided by the embodiment of the present application;

[0023] Figure 14 Structure diagram of another lead-out hole in a photovoltaic module according to an embodiment of the present application

[0024] Figure 15 Structure diagram of a first cell piece and a second cell piece according to an embodiment of the present application Figure 1 ;

[0025] Figure 16 Structure diagram of a first cell piece and a second cell piece according to an embodiment of the present application Figure 2 ;

[0026] Figure 17 Structure diagram of a first cell piece and a second cell piece according to an embodiment of the present application Figure 3 ;

[0027] Figure 18 Structure diagram of a first cell piece and a second cell piece according to an embodiment of the present application Figure 4 ;

[0028] Figure 19 Arrangement diagram of four cell pieces before overlapping arrangement according to an embodiment of the present application Figure 1 ;

[0029] Figure 20 Arrangement diagram of four cell pieces before overlapping arrangement according to an embodiment of the present application Figure 2 ;

[0030] Figure 21 Structure diagram of a first cell piece in a first material according to an embodiment of the present application

[0031] Figure 22 Structure diagram of a second cell piece in a second material according to an embodiment of the present application

[0032] Reference signs:

[0033] 10 - cell piece, 11 - cut edge, 12 - first non-cut edge, 13 - second non-cut edge, 14 - first chamfer, 15 - second chamfer, 16 - connection part column, 161 - positive connection part column, 162 - negative connection part column, 17 - edge connection part, 18 - first cell piece, 19 - second cell piece

[0034] 20 - interconnection, 21 - first interconnection, 22 - second interconnection, 30 - lead-out hole, 40 - wire A

[0035] 50 - cell piece A, 60 - cell piece a, 70 - cell piece b DETAILED DESCRIPTION

[0036] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0037] With reference to Figures 1 to 5 , the embodiments of the present application provide a photovoltaic module, which includes a plurality of cell strings in parallel connection. The cell strings are electrically connected by bus bars. The number of cell strings in the upper half of the photovoltaic module can be odd or even. When the number of cell strings is odd, an additional wire is needed to serve as a cell string so that the cell strings are connected in series and in parallel two by two.

[0038] The cell string includes a plurality of cell pieces 10 arranged in an overlapping manner. The cell piece 10 has opposite cutting edges 11 and a first non-cutting edge 12. In the direction from the back to the front of the photovoltaic module, the N+1th cell piece 10 in the cell string overlaps the Nth cell piece 10 at the edges, and the cutting edge 11 of the N+1th cell piece 10 is pressed on the first non-cutting edge 12 of the Nth cell piece 10. Adjacent two cell pieces 10 in the cell string overlap to form an overlapping area. The photovoltaic module has M overlapping areas. At least M / 3 overlapping areas, the cutting edge 11 is pressed on the first non-cutting edge 12. N and M are both positive integers.

[0039] The number of cell pieces included in a single cell string can be set according to actual needs, for example, it can be set to 10-30. The cell string can include an odd number of cell pieces 10 or an even number of cell pieces 10. The cell piece 10 can be a back contact cell piece with alternating positive and negative fine grids on the back; or a cell piece 10 with double-sided electrodes, such as a TOPcon (Tunnel Oxide Passivating Contacts) cell and a heterojunction cell piece, with positive and negative fine grids respectively on the front and back of the cell piece 10. The cell piece 10 can be a cell piece with a main grid or a cell piece without a main grid. The cell piece 10 has a long edge extending in the length direction thereof. The cutting edge 11 is a long edge of the cell piece 10 formed by a cutting operation, and the first non-cutting edge 12 is a long edge of the cell piece 10 originally present without a cutting operation. The length direction of the cell piece 10 is parallel to the width direction of the cell string, and the width direction of the cell string can refer to Y1 shown in Figure 1 and Figure 3

[0040] ​The cutting edge 11 of the N+1th cell piece 10 is pressed on the first non-cutting edge 12 of the Nth cell piece 10. The cutting edge 11 of the N+1th cell piece 10 overlaps the first non-cutting edge 12 of the Nth cell piece 10, and is located on the side of the first non-cutting edge 12 of the Nth cell piece 10 facing the back of the photovoltaic module.

[0041] The overlapping area is an area where the edge of the N+1th cell piece 10 overlaps the edge of the Nth cell piece 10. The overlapping area is a long strip-shaped area extending along the length direction of the cell piece 10. One kind of overlapping area can refer to R1 shown in FIG. 1, and another kind of overlapping area can refer to R2 shown in FIG. 2. If the number of cell pieces is x, the number of overlapping areas is x-1, and the photovoltaic module has K cell strings, then the total number M of overlapping areas of the photovoltaic module is equal to K×(x-1). Figure 4 Figure 5 If the number of cell pieces is x, the number of overlapping areas is x-1, and the photovoltaic module has K cell strings, then the total number M of overlapping areas of the photovoltaic module is equal to K×(x-1).

[0042] In the process of making the photovoltaic module, the front glass, the front adhesive film, the cell string arranged on the front adhesive film, the back adhesive film, and the back plate are usually laid in sequence, and then the laminated piece is heated and pressed. The material of the adhesive film can be EVA (ethylene-vinyl acetate copolymer), POE (polyolefin elastomer), or EPE (foamed polyethylene), etc. The front glass can be tempered glass, semi-tempered glass, or embossed glass. The back plate can be a white back plate or a glass.

[0043] In the embodiment of the present application, the cutting edge 11 of the N+1th cell piece 10 is pressed on the first non-cutting edge 12 of the Nth cell piece 10, that is, the first non-cutting edge 12 is pressed. The mechanical properties and passivation properties of the first non-cutting edge 12 are good, and it is not easy to crack, which can avoid the problem that the edge pressed at the overlapping area of the Nth and N+1th cell pieces 10 is easy to crack. Moreover, at least M / 3 overlapping areas, the cutting edge 11 is pressed on the first non-cutting edge 12. At this time, the bottom layer of the more overlapping areas in the entire photovoltaic module has good support performance, which can provide multi-point support for the entire photovoltaic module, thereby reducing the pressure borne by the weak overlapping area, and improving the overall anti-cracking performance of the photovoltaic module.

[0044] In some embodiments, at least M / 2 overlapping areas, the cutting edge 11 is pressed on the first non-cutting edge 12, and the first non-cutting edge 12 with good mechanical properties is further increased in proportion as the pressure-bearing edge. When the cutting edge 11 with weak mechanical properties in the entire photovoltaic module acts as the pressure-bearing edge, the probability and number of the first non-cutting edge 12 acting as the pressure-bearing edge at the adjacent overlapping area are greatly increased, thereby providing a certain buffer effect for the cutting edge 11 acting as the pressure-bearing edge from all around, and further improving the overall anti-cracking performance of the photovoltaic module.

[0045] ​In some embodiments, the cutting edge 11 is pressed against the first non-cutting edge 12 at all the overlapping regions, and the design can make the first non-cutting edge 12 bear the pressure at all the overlapping regions in the entire photovoltaic module, without the weak cutting edge 11 bearing the pressure in the photovoltaic module, which can greatly improve the overall anti-cracking performance of the photovoltaic module.

[0046] In some embodiments, the plurality of cell pieces 10 in the cell string are arranged in turn and overlap, which is conducive to simplifying the preparation process of the cell string, and the plurality of cell pieces 10 in the cell string bear pressure on one end and are on the other end, and the stress conditions are basically the same, which can avoid the cracking of some cell pieces 10 due to excessive local stress. In the cell string, the plurality of cell pieces 10 are arranged in turn and overlap in the direction from the head end of the cell string to the tail end. The direction from the head end of the cell string to the tail end can refer to the direction of the X1 arrow shown in Figure 1 and Figure 6 . Preferably, all the cell strings in the photovoltaic module are designed the same and all include the first cell piece 18 and the second cell piece 19 arranged alternately.

[0047] In some embodiments, referring to Figure 2 and Figure 3 , the end of the cutting edge 11 is a right angle; the end of the first non-cutting 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. In the production process, the cutting edge 11 and the first non-cutting edge 12 can be more conveniently distinguished according to the right angle and chamfer, so as to facilitate the adjustment of the direction of the cell piece 10 and the placement of the cell piece 10.

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

[0049] In some embodiments, referring to Figure 6 and Figure 7 , the cell string includes the first cell piece 18 and the second cell piece 19 arranged alternately; the end of the first non-cutting edge 12 of the first cell piece 18 is a first chamfer 14, and the end of the first non-cutting edge 12 of the second cell piece 19 is a second chamfer 15.

[0050] The first cell piece in the battery string can be the first cell piece 18 or the second cell piece 19 in the direction of the first end of the battery string to the end, that is, the X1 direction. In the embodiment, the large chamfer cell piece 10 (the cell piece 10 with the first chamfer 14) and the small chamfer cell piece 10 (the cell piece 10 with the second chamfer 15) are alternately arranged, which is beneficial to reduce the current mismatch and current loss of the cell piece 10. The large chamfer refers to the first chamfer 14, and the small chamfer refers to the second chamfer 15.

[0051] The overlapping area formed when the cutting edge 11 is pressed against the first non-cutting edge 12 with a large chamfer is referred to as R1 in Figure 4 The overlapping area formed when the cutting edge 11 is pressed against the first non-cutting edge 12 with a small chamfer is referred to as R2 in Figure 4 The end point positions of the two kinds of overlapping areas are different. By alternately arranging the first non-cutting edge 12 with the cutting edge 11 pressed against the large chamfer and the first non-cutting edge 12 with the cutting edge 11 pressed against the small chamfer, the two kinds of overlapping areas with different end point positions can be alternately arranged, so that the stress concentration positions are staggered 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 1.12-7.4.

[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., and can also be 7.5, 7.6, 7.7, 7.7, 7.9, 8, etc. In the embodiment, the length difference between the first chamfer 14 and the second chamfer 15 can be avoided, so as to ensure that the stress difference of each overlapping area in the battery string is small, and the process difficulty can be reduced.

[0054] In some embodiments, the first non-cutting edge 12 is pressed against the cutting edge 11 with a large chamfer, and the first non-cutting edge 12 is pressed against the cutting edge 11 with a small chamfer. Figure 2 and Figure 3 In the direction from the back surface of the photovoltaic module to the front surface, the chamfer part at the end of the first non-cutting edge 12 is covered by the cutting edge 11. When the chamfer is only partially covered, the coverage length or the remaining length of the chamfer can be used to accurately determine whether the size of the overlapping area meets the standard.

[0055] In some embodiments, the lengths of the chamfers at the two ends of the first non-cutting edge 12 covered by the cutting edge 11 are not equal. In the embodiment, when the covered sizes of the left and right ends of the first non-cutting edge 12 are different, the compression points of the two chamfers are not on the same parallel edge line, and cracks along the left-right direction are not easy to occur.

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

[0057] In some embodiments, the ratio of the length of the first non-cutting edge 12 to the length of the cutting edge 11 is greater than or equal to 0.91 and less than 1.

[0058] The length of the first non-cutting edge 12 with the first chamfer 14 at the end is less than the length of the first non-cutting edge 12 with the second chamfer 15 at the end, and thus the ratio of the length of the first non-cutting edge 12 with the first chamfer 14 at the end 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 at the end 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 at the end 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 at the end to the length of the cutting edge 11 can be 0.98. By controlling the length of the first non-cutting edge 12, the chamfer can be relatively small, so that the effective area of the battery piece 10 can be increased as much as possible.

[0059] In some embodiments, in the battery string, the width difference between the N+1th battery piece 10 and the Nth battery piece 10 is less than or equal to 1.2 mm. The width of the battery piece 10 can be controlled by the cutting process, and thus the area of each battery piece 10 in the assembly can be effectively controlled to be consistent, thereby ensuring that the current of each battery piece 10 is balanced, and reducing the loss caused by unbalanced current.

[0060] In some embodiments, the width difference between the N+1th battery piece 10 and the Nth battery piece 10 can be 0 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, etc. The width difference between the N+1th battery piece 10 and the Nth battery piece 10 is preferably less than or equal to 0.2 mm.

[0061] In some embodiments, the width of the overlapping area is greater than or equal to 0.2 mm and less than or equal to 1.2 mm. The width of the overlapping area can be 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, etc. The width of the overlapping area is preferably 0.3 mm-0.7 mm. If the width of the overlapping area is too small, the pressed edge is prone to crack, and if the width of the overlapping area is too large, too many electrodes are blocked. In the present embodiment, when the width of the overlapping area is within the above range, the pressed edge can be further prevented from cracking, and the number of blocked electrodes can be reduced. The width of the above overlapping area is beneficial to improving the process efficiency while reducing the risk of cracking.

[0062] In some embodiments, the photovoltaic module further comprises a front-side adhesive film and a back-side adhesive film, the front-side adhesive film extends into the overlapping area, and the back-side adhesive film extends into the overlapping area. The cell string is located between the front-side adhesive film and the back-side adhesive film. The adhesive film in the photovoltaic module plays a role of fixing the layer structure. By extending the front-side adhesive film and the back-side adhesive film into the overlapping area, the gap in the overlapping area of the two cell pieces 10 can be filled, thereby stabilizing the two cell pieces 10 and preventing friction in the overlapping area, further reducing the problem of hidden cracks in the photovoltaic module during service, and improving the service life of the photovoltaic module. It should be understood that the adhesive film extending into the overlapping area can form discrete adhesive film points, or can be integrated with the original adhesive film. The adhesive film can extend into part of the overlapping area or the entire overlapping area.

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

[0064] The fine grid electrode protrudes from the cell piece body. If the number of fine grid electrodes located in the overlapping area is large, it will cause local stress concentration at the overlapping area (the position of the fine grid electrode). In this embodiment, the number of fine grid electrodes located in an overlapping area is small, or even 0, which can reduce the extrusion of the fine grid electrode on the local cell piece 10 at the overlapping area, and reduce the risk of hidden cracks. When the number of fine grid electrodes located in an overlapping area is 0, process errors are allowed to exist, for example, most of the overlapping areas in the photovoltaic module do not have fine grid electrodes, and if individual fine grid electrodes are located in the overlapping area, it is a process error.

[0065] In some embodiments, the first side surface of the cell piece 10 at the position of the cutting edge 11 has a first passivation layer.

[0066] The cell piece 10 has four side surfaces, and the first side surface is the side surface of the cell piece 10 corresponding to the cutting edge 11. The material of the first passivation layer can be silicon oxide, aluminum oxide, aluminum nitride, etc. Part of the interconnection 20 is pressed on the cutting edge 11, the interconnection 20 has a bending part, the bending part is bent from the back surface of the photovoltaic module to the front surface of the photovoltaic module, and the bending part is located on one side of the first side surface. In this embodiment, the first side surface has a first passivation layer, which can avoid the failure of the cell piece 10 caused by the migration of metal particles of the interconnection 20 to the inside of the cell piece 10 through the first side surface.

[0067] In some embodiments, the second side surface of the cell piece 10 at the position of the first non-cutting edge 12 has a second passivation layer. The second passivation layer covers the second side surface and the front and back surfaces of the cell piece 10, so that the surfaces smoothly transition between each other, reducing the stress mutation between the surfaces, and thereby reducing the risk of fragmentation and hidden cracks.

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

[0069] The second side is a side of the cell piece 10 corresponding to the first non-cutting edge 12. The cell piece 10 is cut from the cell piece A 50, and during preparation of the cell piece A 50, the four sides thereof are formed with passivation layers. The cell piece 10 is cut from the cell piece A 50, and during preparation of the cell piece A 50, the second passivation layer on the second side is formed, and the first passivation layer on the first side is separately provided subsequently. The second passivation layer at the position of the first non-cutting edge 12 is thicker or has a greater number of layers, which is conducive to enhancing the pressure-bearing capacity of the first non-cutting edge 12 and reducing the risk of hidden cracks.

[0070] In some embodiments, with reference to Figure 1 , the cell piece 10 further has a second non-cutting edge 13 adjacent to the cutting edge 11, and on the third side of the cell piece 10 at the position of the second non-cutting edge 13, the extending portion of the first passivation layer is located on the extending portion of the second passivation layer. The second non-cutting edge 13 is a short edge of the cell piece 10 that is originally present and has not been subjected to a cutting operation, and the third side is a side of the cell piece 10 corresponding to the second non-cutting edge 13. The first passivation layer and the second passivation layer extend to the third side during formation. On the third side, the extension and superposition of the first and second passivation layers can ensure that the passivation layers on the first side (cutting surface) and the second side (non-cutting surface) have sufficient coverage.

[0071] In some embodiments, the second side has a roughness less than that of the first side. The second side is specifically a polished surface, and the first side is specifically a damaged surface. When the second side is a polished surface or has a small roughness, there are relatively few stress peaks or relatively few stress mutation points relative to the damaged surface, which can reduce the risk of hidden cracks on the second side.

[0072] In some embodiments, with reference to Figure 6 , the cell piece 10 has a plurality of connection part columns 16 for electrical connection with the interconnector 20; and in the cell string, the plurality of connection part columns 16 in the (N+1)th cell piece 10 are centrally symmetric to the plurality of connection part columns 16 in the Nth cell piece 10. The connection part column 16 is a column formed by a plurality of connection parts.

[0073] The plurality of connection portion rows 16 include a positive connection portion row 161 and a negative connection portion row 162, and the arrangement of the plurality of connection portion rows 16, mainly the positive connection portion row 161 and the negative connection portion row 162, is centrally symmetrical, and the size allows for errors.

[0074] In the embodiment, the plurality of connection portion rows 16 in the N+1th battery piece 10 are centrally symmetrical with the plurality of connection portion rows 16 in the Nth battery piece 10, which can ensure that the interconnector 20 extends in a straight line when the interconnector 20 is welded to the battery piece 10, and facilitates the layout of the interconnector 20.

[0075] In some embodiments, referring to Figure 6 , Figure 7 and Figure 9 , the battery string includes first battery pieces 18 and second battery pieces 19 arranged alternately, and adjacent first battery pieces 18 and second battery pieces 19 are cut from the same battery piece A50; the battery piece A50 is a whole battery piece, a 1 / 2 battery piece, a 1 / 3 battery piece, or a 1 / 4 battery piece; the battery piece A50 has at least two sub-regions, and the connection portion rows 16 of adjacent two sub-regions are axially symmetrical.

[0076] In the embodiment, the adjacent first battery piece 18 and the second battery piece 19 are specifically cut in half from the same battery piece A50. The battery piece A50 is preferably a 1 / 2 battery piece, has two sub-regions, and the connection portion rows 16 of the two sub-regions are axially symmetrical, and the axis of symmetry can refer to the line F shown in Figure 9 . The connection portion rows 16 of the adjacent two sub-regions of the battery piece A50 are axially symmetrical, and after the battery piece A50 is cut in half to form two battery pieces 10, rotating one of the battery pieces 10 can make the connection portion rows 16 of the two battery pieces 10 centrally symmetrical.

[0077] In some embodiments, along the length direction of the photovoltaic module, the photovoltaic module has a first region and a second region; the battery string in the first region is a first type of battery string, and the battery string in the second region is a second type of battery string; or, the battery string in the first region and the second region is a first type of battery string; referring to Figure 12 , the negative electrode lead-out end of the first type of battery string is an even-numbered interconnector, and the negative electrode lead-out end of the second type of battery string is an odd-numbered interconnector.

[0078] In the embodiment, the length direction of the photovoltaic module can refer to the direction indicated by the arrow X2 in Figures 10 to 12 , and the first region can be the upper part of the photovoltaic module, which can refer to Figures 10 to 12The second region can be a lower part of the photovoltaic module, and the lower part is described with reference to Figures 10 to 12 The upper part and the junction line of the lower part can be a center line of the photovoltaic module along the width direction of the photovoltaic module.

[0079] The first type of cell string is different from the first cell piece of the second type of cell string. The first type of cell string is a cell string whose first cell piece is the first cell piece 18, and the first type of cell string can be referred to Figure 1 and Figure 6 The second type of cell string is a cell string whose first cell piece is the second cell piece 19, and the second type of cell string can be referred to Figure 7 The first type of cell string is different from the first cell piece of the second type of cell string. The first type of cell string is a cell string whose first cell piece is the first cell piece 18, and the first type of cell string can be referred to

[0080] When the negative electrode lead-out end of the first type of cell string and the negative electrode lead-out end of the second type of cell string are both directed to the same direction, the negative electrode lead-out end of the first type of cell string is the even-numbered column interconnection piece, and the negative electrode lead-out end of the second type of cell string is the odd-numbered column interconnection piece. For example, referring to Figure 8 , the negative electrode lead-out end of the first type of cell string and the negative electrode lead-out end of the second type of cell string on the right side T2 are both directed upward, the negative electrode lead-out end of the first type of cell string is the even-numbered column interconnection piece, and the negative electrode lead-out end of the second type of cell string is the odd-numbered column interconnection piece. The even-numbered column interconnection piece refers to the direction of the interconnection piece 20 being the even-numbered interconnection piece along the direction of the left side of the cell string pointing to the right side, and the odd-numbered column interconnection piece refers to the direction of the interconnection piece 20 being the odd-numbered interconnection piece along the direction of the left side of the cell string pointing to the right side.

[0081] In some embodiments, referring to Figure 2 and Figure 3 The cell string further includes the interconnection piece 20 of the plurality of cell pieces 10 in the series cell string, and the interconnection piece 20 includes a first interconnection piece 21 and a second interconnection piece 22. Along the width direction of the cell string, the first interconnection piece 21 is close to the edge of the cell string, and the first interconnection piece 21 does not overlap with the overlapping region. The edge position of the cell piece 10 and the edge part of the overlapping region are usually relatively weak, and the first interconnection piece 21 of the edge does not overlap with the overlapping region, that is, the first interconnection piece 21 of the edge will not press on the overlapping region, which can avoid the edge of the pressed edge being prone to cracking caused by the first interconnection piece 21 of the edge pressing on the overlapping region.

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

[0083] In some embodiments, the interconnector 20 is a flat solder strip, which is in a surface-to-surface contact mode with the cell 10, instead of a point-to-surface or line-to-surface contact mode, and the pressure on the overlapping area is more dispersed, which can further avoid the edge crack of the pressed edge. The interconnector 20 includes a metal core and a coating. The metal core can be a copper core or a copper-clad aluminum core, and the coating can be a tin alloy.

[0084] In some embodiments, the interconnector a connects the N+1th cell 10 and the Nth cell 10, the overlapping length of the interconnector a with the N+1th cell 10 is a first length, and the overlapping length of the interconnector a with the Nth cell 10 is a second length, and the first length is greater than the second length. The overlapping length of the interconnector a with the N+1th cell 10 is the length of the overlapping part of the interconnector a with the N+1th cell 10 in the length direction of the cell string. The overlapping length of the interconnector a with the Nth cell 10 is the length of the overlapping part of the interconnector a with the Nth cell 10 in the length direction of the cell string. When the interconnector a overlaps the previous cell for a shorter length and overlaps the next cell for a longer length, the interconnector a overlaps the previous cell at the end for a smaller length, so that the slope and fluctuation of the interconnector a in the overlapping area is smaller, which can ensure the connection strength of the interconnector a with the end of the previous cell. In calculating the length of the overlapping part, the length of the part of the interconnector a attached to the previous and next cells can be measured.

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

[0086] In some embodiments, referring to Figure 13 and Figure 14 The photovoltaic module includes a back sheet, and a lead-out hole 30 is formed in the back sheet. The area of the projection of the lead-out hole 30 on the cell 10 in the thickness direction of the photovoltaic module accounts for less than 20% of the area of the lead-out hole 30. The lead-out hole 30 is a circular lead-out hole or an elliptical lead-out hole. The photovoltaic module can have both circular lead-out holes and elliptical lead-out holes, and the area of the elliptical lead-out hole is greater than the area of the circular lead-out hole.

[0087] The overlapping area of the normal projection of the lead-out hole 30 and the battery piece 10 is preferably less than 10% of the area of the lead-out hole 30. The overlapping area of the normal projection of the partial lead-out hole 30 and the battery piece 10 can be 0. In the embodiment, the overlapping area of the normal projection of the lead-out hole 30 and the battery piece 10 is small, and even no overlapping, which can avoid the battery piece 10 from shielding the lead-out hole 30, and avoid the electrical interference between the electrode on the battery piece 10 and the bus bar at the position of the lead-out hole 30.

[0088] In some embodiments, referring to Figure 10 and Figure 11 , the photovoltaic module includes battery string A and battery string B arranged along the length direction of the photovoltaic module, and the multiple battery pieces 10 in the battery string A and the battery string B are arranged in the same overlapping direction; the photovoltaic module has two opposite ends along the length direction, and the first direction is the direction in which one end of the photovoltaic module points to the other end. Since the arrangement direction of the battery pieces 10 is consistent along the length of the entire photovoltaic module, the extrusion and flow direction of the adhesive film is consistent during the lamination process, which can reduce the local accumulation of the adhesive film, reduce the impact of the adhesive film on the overlapping area, and improve the stability of the interconnection of the battery pieces 10. The overlapping direction mentioned here refers to the sequence of the battery pieces 10 stacked upwards from top to bottom of the photovoltaic module, the second battery piece 10 pressing the first battery piece 10, and the third battery piece 10 pressing the second battery piece 10; or the sequence of the battery pieces 10 stacked upwards from bottom to top of the photovoltaic module, the second battery piece 10 pressing the first battery piece 10, and the third battery piece 10 pressing the second battery piece 10.

[0089] In some embodiments, referring to Figure 10 and Figure 11 , the photovoltaic module includes battery string C and battery string D arranged along the width direction of the photovoltaic module, and the multiple battery pieces 10 in the battery string C and the battery string D are arranged in the same overlapping direction. The width direction of the photovoltaic module can refer to the direction indicated by the Y2 arrow in Figure 10 and Figure 11 . Along the width of the photovoltaic module, the arrangement direction of the battery pieces 10 of the multiple battery strings is the same, which can make the extrusion and flow direction of the adhesive film consistent during the lamination process, reduce the local accumulation of the adhesive film, reduce the impact of the adhesive film on the overlapping area, and improve the stability of the interconnection of the battery pieces 10. The overlapping arrangement direction can be understood as the direction in which the battery pieces 10 in the battery string are stacked in sequence, for example, the sequence of the battery pieces stacked upwards from top to bottom of the photovoltaic module, the second battery piece 10 pressing the first battery piece 10, and the third battery piece 10 pressing the second battery piece 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 further comprises a conductor A40 extending along the length direction of the photovoltaic module, and the conductor A40 has a cell string A and a cell string B on one side along the width direction of the photovoltaic module; the distance between the cell string A and the conductor A40 is greater than the distance between the cell string B and the conductor A40; and the distance between the cell string B and the conductor A40 is 1mm-3mm.

[0097] The conductor A40 connects two ends of the cell string and is used for transmitting current. Alternatively, the conductor A40 connects two ends of the cell string in parallel with a diode in the junction box. In the same photovoltaic module, there can be two conductors A40 with different widths. Of course, the conductors A40 can also be the same. The width of the conductor A40 can be consistent with the width of the busbar in the middle of the photovoltaic module, or less than the width of the busbar in the middle of the photovoltaic module. In the photovoltaic module, the thicknesses of the conductors A40 and the busbar are basically consistent, and the error is generally within 0.1mm.

[0098] The length direction of the photovoltaic module can refer to the direction shown by X2 in Figure 13 and Figure 14 , and the width direction of the photovoltaic module can refer to the direction shown by Y2 in Figure 13 and Figure 14 . The distance between the cell string B and the conductor A40 can be 1mm, 1.5mm, 1.8mm, 2mm, 3mm, etc. In the embodiment, the conductor A40 can be prevented from being too close to the cell string A and the cell string B, so that the influence of the conductor A40 on the adjacent cell sheet 10 can be reduced, and the short circuit problem can be avoided.

[0099] In some embodiments, referring to Figure 2 , the cell sheet 10 has an edge connecting portion 17, and the head of the interconnection 20 extends out of the edge connecting portion 17 by 5.5mm or less.

[0100] The edge connecting portion 17 is the connecting portion in the connecting portion column 16 close to the edge of the cell sheet 10. The distance that the head of the interconnection 20 extends out of the edge connecting portion 17 is the distance between the end surface of the head of the interconnection 20 and the edge connecting portion 17 along the extension direction of the interconnection 20. The head of the interconnection 20 extends out of the edge connecting portion 0mm or more and 5.5mm or less. In the embodiment, on the basis of ensuring effective connection between the interconnection 20 and the edge connecting portion 17, the interconnection 20 can be prevented from being too long to interfere with the overlapping area.

[0101] The embodiment of the application further provides a photovoltaic module preparation method, which comprises the following steps:

[0102] providing a cell sheet a and a cell sheet b;

[0103] cutting the provided cell sheet a and the cell sheet b to obtain four cell sheets;

[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 the battery string prepared in this embodiment, the cutting edge 11 of the N+1th battery piece is pressed on the first non-cutting edge 12 of the Nth battery piece, that is, the first non-cutting edge 12 is pressed. The first non-cutting edge 12 has good mechanical properties and passivation properties, and is not prone to hidden cracks. Therefore, the problem of hidden cracks of the pressed edge at the overlapping portion of the adjacent two battery pieces can be avoided.

[0111] In some embodiments, the battery piece a60 and the battery piece b70 each have a plurality of connection portion columns 16, and the connection portion columns 16 of the upper and lower portions in the battery piece a60 and the battery piece b70 are axisymmetric. After the battery piece a60 and the battery piece b70 are cut, the first and third battery pieces or the second and fourth battery pieces are rotated, so that the connection portion columns 16 on the latter battery piece and the former battery piece are center-symmetric, and the cutting edge 11 and the first non-cutting edge 12 are opposite.

[0112] In some embodiments, after the first and third battery pieces are rotated by 180 degrees, or the second and fourth battery pieces are rotated by 180 degrees, the positions of the first, second, third, and fourth battery pieces are adjusted before the plurality of battery pieces are arranged in an overlapping manner, so that the positive connection portion and the negative connection portion of the adjacent two battery pieces are opposite.

[0113] In some embodiments, after the first and third battery pieces are rotated by 180 degrees, or the second and fourth battery pieces are rotated by 180 degrees, if the positive connection portion column 161 and the negative connection portion column 162 of the adjacent two battery pieces 10 are directly opposite, the positions of the first, second, third, and fourth battery pieces are maintained. After rotation, if the positive connection portion column 161 and the negative connection portion column 162 of the adjacent two battery pieces 10 are not opposite, the positions of the first, second, third, and fourth battery pieces are adjusted. When the positions of the first, second, third, and fourth battery pieces are adjusted, in addition to not rotating the battery pieces 10, the positions of the battery pieces 10 can be adjusted arbitrarily as long as the series connection requirement is met, so that the cutting edge 11 is pressed on the first non-cutting edge 12.

[0114] When the plurality of battery pieces are arranged in an overlapping manner, the four battery pieces after cutting, rotating, and adjusting the positions can be arranged in an overlapping manner from top to bottom, or from bottom to top.

[0115] The arrangement of the battery piece a60 and the battery piece b70 can have four modes, which are specifically described with reference to the four arrangement modes shown in Figures 15 to 18 The battery piece a60 and the battery piece b70 each have a first long side and a second long side. The end of the first long side is a large chamfer, and the end of the second long side is a small chamfer. Figure 15 In the first arrangement mode, the first long side of the battery piece a60 faces upward, and the second long side of the battery piece a60 is opposite to the first long side of the battery piece b70. Figure 16In the figure, the first long side of the battery piece a60 faces upward, and the second long side of the battery piece a60 is opposite to the second long side of the battery piece b70. Figure 17 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70. Figure 18 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70.

[0116] As an example, in the way of arranging the four battery pieces after cutting, rotating and adjusting positions from top to bottom, for the four battery pieces shown in Figure 15 In the figure, the first long side of the battery piece a60 faces upward, and the second long side of the battery piece a60 is opposite to the second long side of the battery piece b70. Figure 19 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70. Figure 15 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70. Figure 20 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70. Figure 15 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70. Figure 20 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70.

[0117] In the way of arranging the four battery pieces after cutting, rotating and adjusting positions from top to bottom, for the four battery pieces shown in Figure 16 , Figure 17 , Figure 18 In the figure, the first long side of the battery piece a60 faces upward, and the second long side of the battery piece a60 is opposite to the second long side of the battery piece b70. Figure 19 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70. Figure 20 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70.

[0118] As an example, in the way of arranging the four battery pieces after cutting, rotating and adjusting positions from bottom to top, for the four battery pieces shown in Figure 15 In the figure, the first long side of the battery piece a60 faces upward, and the second long side of the battery piece a60 is opposite to the second long side of the battery piece b70. Figure 19 In the figure, the second long side of the battery piece a60 faces upward, and the first long side of the battery piece a60 is opposite to the first long side of the battery piece b70. Figure 15The battery piece a60 and the battery piece b70 shown in the figure can also rotate the second and fourth battery pieces, and maintain the positions of the first, second, third and fourth battery pieces, so as to obtain four battery pieces, which are the same as the four battery pieces in the figure Figure 20 The structure after the four battery pieces in the figure are rotated by 180 degrees is the same as the structure in the figure. Figure 15 The battery piece a60 and the battery piece b70 shown in the figure can also rotate the second and fourth battery pieces, and adjust the order to be the third battery piece, the rotated second battery piece, the first battery piece and the rotated fourth battery piece, so as to obtain four battery pieces, which are the same as the four battery pieces in the figure Figure 20 The structure after the four battery pieces in the figure are rotated by 180 degrees is the same as the structure in the figure.

[0119] The embodiment of the present application also provides a photovoltaic module preparation method, which comprises the following steps:

[0120] The first incoming material comprises a plurality of first battery pieces, and the second incoming material comprises a plurality of second battery pieces, and the first battery pieces and the second battery pieces are different in type;

[0121] The first battery pieces and the second battery pieces are taken out and transmitted alternately;

[0122] The plurality of battery pieces are arranged in an overlapping manner; wherein the cutting edge of the N+1th battery piece is pressed on the first non-cutting edge of the Nth battery piece.

[0123] The plurality of battery pieces are connected in series by the interconnection piece to form a battery string.

[0124] The first battery piece 18 and the second battery piece 19 are two types of battery pieces 10 required for preparing the battery string. When the first battery piece 18 and the second battery piece 19 are transmitted alternately, the first battery piece 18 can be transmitted first, or the second battery piece 19 can be transmitted first. At this time, the cutting, rotating, adjusting position and other operations are not required, the battery piece arranging operation can be simplified, the process difficulty is reduced, and the module manufacturing efficiency can be greatly improved.

[0125] In the embodiment, the cutting edge 11 of the N+1th battery piece in the prepared battery string is pressed on the first non-cutting edge 12 of the Nth battery piece, that is, the first non-cutting edge 12 is pressed. The mechanical property and passivation property of the first non-cutting edge 12 are good, and the first non-cutting edge 12 is not easy to crack, so that the problem that the pressed edge is easy to crack at the overlapping position of the adjacent two battery pieces can be avoided.

[0126] In some embodiments, the first and second raw materials are stored in two containers. In this embodiment, the first and second raw materials are stored in two containers in different locations, and the type of the battery piece taken out of the container is fixed, without the need to identify the type of the battery piece. When a certain battery piece is damaged, the next battery piece can be directly taken out, and the process difficulty and material loss are greatly reduced compared with immediate cutting.

[0127] In some embodiments, the first and second raw materials are stored in the same container. In this embodiment, the first and second raw materials do not need to be stored in two containers. At this time, the raw materials are mixed and loaded in sequence according to the order to complete the alternate arrangement of the first and second raw materials.

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

[0129] In some embodiments, the plurality of battery pieces in transmission are arranged in an overlapping manner, including: arranging the plurality of battery pieces in transmission in an overlapping manner, so that the cutting edges and the first non-cutting edges of the adjacent two battery pieces are arranged in the same direction. For example, the cutting edges 11 of the adjacent two battery pieces are arranged in the upward direction, and the first non-cutting edges 12 of the adjacent two battery pieces are arranged in the downward direction, so that the cutting edges 11 of the adjacent two battery pieces are opposite to the first non-cutting edges 12.

[0130] In some embodiments, taking out the first battery piece and the second battery piece includes:

[0131] The first battery piece and the second battery piece are identified by the electrode pattern of the battery piece, and the first battery piece and the second battery piece are taken out.

[0132] In some embodiments, the first battery piece and the second battery piece are identified by the number of thin grid electrodes connected by the connection part at the upper left corner or the lower left corner of the battery piece. The first battery piece and the second battery piece can also be identified by other differences in the electrode pattern, for example, by the difference in the structure of the connection part at the upper left corner or the lower left corner of the battery piece.

[0133] It should be noted that, in this document, the terms "comprising", "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more limitations, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0134] The above describes the embodiments of the present application in connection with the drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, rather than limiting, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the protected scope, and these all belong to the protection of the present application.

Claims

1. A photovoltaic module, characterized by, The battery string comprises a plurality of battery pieces arranged in an overlapping manner; The battery piece has opposite cutting edges and a first non-cutting edge, and the N+1th battery piece in the battery string overlaps with the Nth battery piece at the edges, and the cutting edge of the N+1th battery piece is pressed on the first non-cutting edge of the Nth battery piece. The adjacent two battery pieces in the battery string overlap to form an overlapping area, and the photovoltaic module has M overlapping areas, and at least M / 3 overlapping areas, the cutting edge is pressed on the first non-cutting edge, and N and M are positive integers.

2. The photovoltaic module of claim 1, wherein, At least M / 2 overlapping areas, the cutting edge is pressed on the first non-cutting edge; Or, at all overlapping areas, the cutting edge is pressed on the first non-cutting edge; And / or, the plurality of battery pieces in the battery string are arranged in an overlapping manner.

3. The photovoltaic module of claim 1, wherein, The end of the cutting edge is a right angle; and / or, The end of the first non-cutting 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.

4. The photovoltaic module of claim 3, wherein, The battery string comprises first battery pieces and second battery pieces arranged alternately; The end of the first non-cutting edge of the first battery piece is the first chamfer, and the end of the first non-cutting edge of the second battery piece is the second chamfer.

5. The photovoltaic module of claim 3, wherein, The length ratio of the first chamfer to the second chamfer is less than or equal to 8, and greater than 1; Or, the length ratio of the first chamfer to the second chamfer is 1.12-7.

4.

6. The photovoltaic module of claim 3, wherein, From the direction of the back surface to the front surface of the photovoltaic module, the chamfer part at the end of the first non-cutting edge is covered by the cutting edge; and / or, the lengths of the chamfers at both ends of the first non-cutting edge covered by the cutting edge are not equal.

7. The photovoltaic module of claim 1, wherein, The length ratio of the first non-cutting edge to the cutting edge is greater than or equal to 0.91, and less than 1.

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

9. 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.

10. The photovoltaic module of claim 1, wherein, The photovoltaic module further comprises a front adhesive film and a back adhesive film, and the front adhesive film and / or the back adhesive film extends into the overlapping area.

11. The photovoltaic module of claim 1, wherein, The battery piece has a plurality of fine grid electrodes, and the number of fine grid electrodes in one overlapping area is less than or equal to 2.

12. The photovoltaic module of claim 1, wherein, The first side surface at the position of the cutting edge on the battery piece has a first passivation layer.

13. The photovoltaic module of claim 12, wherein, The second side surface at the position of the first non-cutting edge on the battery piece 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 piece further has a second non-cutting edge adjacent to the cutting edge, and the extension part of the first passivation layer on the third side surface at the position of the second non-cutting edge is located above the extension part of the second passivation layer; and / or, the roughness of the second side surface is less than the roughness of the first side surface.

14. The photovoltaic module according to any of claims 1 to 13, characterized in that The battery piece has a plurality of connection part columns, and the connection part columns are used for electrical connection with the interconnector; 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.

15. The photovoltaic module according to any of claims 1-13, 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.

16. The photovoltaic module according to any of claims 1-13, wherein, 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.

17. The photovoltaic module according to any of claims 1-13, 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.

18. The photovoltaic module of any of claims 1-13, 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.

19. The photovoltaic module of any of claims 1-13, 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.

20. The photovoltaic module of any of claims 1-13, 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.

21. The photovoltaic module of any of claims 1-13, wherein, 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 of any of claims 1-13, 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 comprises cell strings C and D arranged along the width direction of the photovoltaic module, and the overlapping arrangement direction of the plurality of cell pieces in the cell string C and the cell string D is opposite.

23. The photovoltaic module of any of claims 1-13, wherein, The photovoltaic module further comprises a wire A extending along the length direction of the photovoltaic module, and one side of the wire A has a cell string A and a cell string B; The distance between the cell string A and the wire A is greater than the distance between the cell string B and the wire A, and / or the distance between the cell string B and the wire A is 1mm-3mm.

24. The photovoltaic module of any of claims 1-13, wherein, The cell string further comprises an interconnection piece for connecting the plurality of cell pieces in the cell string in series; The cell piece has an edge connection part, and the head of the interconnection piece protrudes from the edge connection part by 5.5mm or less.

25. A method for manufacturing a photovoltaic module, characterized in that, Comprising: Providing a cell piece a and a cell piece b; Cutting the provided cell piece a and cell piece b to obtain four cell pieces; Rotating the first and third cell pieces by 180 degrees, or rotating the second and fourth cell pieces by 180 degrees; Overlapping arrangement of a plurality of cell pieces; wherein the cutting edge of the N+1th cell piece is pressed on the first non-cutting edge of the Nth cell piece; Utilizing an interconnection piece to connect the plurality of overlapping cell pieces in series into a cell string.

26. The method of claim 25, wherein the step of applying the encapsulant is performed by a method selected from the group consisting of: extrusion, slot-die coating, and screen printing. The long edges of the cell piece a and the cell piece b are opposite, the cell piece a and the cell piece b each have a plurality of connection part columns, and the connection part columns of the upper and lower parts in the cell piece a and the cell piece b are axisymmetric.

27. The method of making a photovoltaic assembly of claim 25, wherein, After the first and third cell pieces are rotated by 180 degrees, or the second and fourth cell pieces are rotated by 180 degrees, and before the overlapping arrangement of a plurality of cell pieces, it further comprises: Adjusting the positions of the first, second, third and fourth cell pieces so that the positive and negative connection part columns of the adjacent two cell pieces are opposite.

28. A method for manufacturing a photovoltaic module, characterized in that, Comprising: Providing a first incoming material and a second incoming material, wherein the first incoming material comprises a plurality of first cell pieces, and the second incoming material comprises a plurality of second cell pieces, and the first cell pieces and the second cell pieces are of different types; Taking out the first cell pieces and the second cell pieces and alternately conveying the first cell pieces and the second cell pieces; Overlapping arrangement of a plurality of conveyed cell pieces; wherein the cutting edge of the N+1th cell piece is pressed on the first non-cutting edge of the Nth cell piece; Utilizing an interconnection piece to connect the plurality of cell pieces into a cell string.

29. The method of making a photovoltaic assembly of claim 28, wherein, The first incoming material and the second incoming material are separately stored in two containers.

30. The method of making a photovoltaic assembly of claim 28, wherein, The first incoming material and the second incoming material are stored in the same container.

31. The method of making a photovoltaic assembly of claim 28, wherein, The first cell piece has a first chamfer, and the second cell piece has a second chamfer, and the length of the first chamfer is greater than the length of the second chamfer.

32. The method of making a photovoltaic assembly of claim 28, wherein, The overlapping arrangement of a plurality of conveyed cell pieces comprises: Overlapping arrangement of a plurality of conveyed cell pieces so that the cutting edge and the first non-cutting edge of the adjacent two cell pieces are arranged in the same direction.

33. The method of making a photovoltaic assembly of claim 30, wherein, The taking out of the first cell pieces and the second cell pieces comprises: The first and second battery pieces are identified by electrode patterns of the battery pieces, and the first and second battery pieces are extracted.

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