Photovoltaic module, method for manufacturing photovoltaic module, and screen printing stencil

Abstract

The present application relates to the technical field of photovoltaics, and discloses a photovoltaic module, a method for manufacturing the photovoltaic module, and a screen printing stencil. The photovoltaic module comprises: a solar cell body, which has a first surface and a second surface opposite to each other; connecting portions, wherein the connecting portions are disposed on the first surface, the connecting portions include first connecting portions and second connecting portions, the first connecting portions and the second connecting portions are arranged at intervals in a first direction, and the area of the first connecting portion is greater than the area of the second connecting portion; first bonding layers, wherein each first bonding layer is disposed on the surface of a corresponding first connecting portion away from the solar cell body, the first bonding layer comprises at least two elongated first bonding strips, and the at least two first bonding strips extend in a second direction and are arranged at an interval in the first direction; and electrical connectors which are disposed on the first bonding layers, wherein the electrical connectors extend in the first direction and each intersect the corresponding at least two elongated first bonding strips, and the electrical connectors are electrically connected to the first connecting portions by means of the first bonding layers.

Description

A photovoltaic module, a method for manufacturing a photovoltaic module and a screen printing plate

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 2024215942781, filed on July 5, 2024, entitled "A photovoltaic module and a screen printing plate", and Chinese Patent Application No. 2024115164811, filed on October 28, 2024, entitled "A photovoltaic module, a method for manufacturing a photovoltaic module and a screen printing plate", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of photovoltaic, in particular to a photovoltaic module, a method for manufacturing a photovoltaic module and a screen printing plate. BACKGROUND

[0004] A solar cell is a core component of a photovoltaic module, which can convert solar energy into electrical energy. The surface of the solar cell is provided with a plurality of fine grids extending along a first direction and spaced apart along a second direction, which collect the current generated by the cell. The surface is also provided with a plurality of pads spaced apart along the second direction, which connect the solder strip to the fine grid through the plurality of pads to collect the current collected by the fine grid.

[0005] In related technologies, in order to improve the reliability of the connection between the solder strip and the pad, a tin layer is provided between the pads.

[0006] However, due to the large area of some pads and the small area of some pads, during the soldering process of the solder strip and the pad, the soldering is not firm, and the phenomenon of virtual welding occurs, which affects the reliability and photoelectric conversion efficiency of the photovoltaic module. SUMMARY

[0007] The present application discloses a photovoltaic module, a method for manufacturing a photovoltaic module and a screen printing plate, to solve or at least partially solve the problem that in related technologies, due to the large area of some pads and the small area of some pads, during the soldering process of the solder strip and the pad, the soldering is not firm, and the phenomenon of virtual welding occurs, which affects the reliability and photoelectric conversion efficiency of the photovoltaic module.

[0008] To solve the above technical problems, the present application is implemented as follows:

[0009] In a first aspect, the present application discloses a photovoltaic module, comprising a cell body, the cell body having a first surface and a second surface arranged oppositely; a connecting portion, the connecting portion being arranged on the first surface, the connecting portion comprising a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being arranged spaced apart along a first direction, the first connecting portion having an area greater than that of the second connecting portion; a first bonding layer, the first bonding layer being arranged on a surface of the first connecting portion away from the cell body, the first bonding layer comprising at least two first bonding strips in a strip structure, the at least two first bonding strips extending along a second direction and being arranged spaced apart along the first direction, the second direction intersecting the first direction; and an electrical connecting member, the electrical connecting member being arranged on the first bonding layer, the electrical connecting member extending along the first direction and being arranged intersecting the at least two first bonding strips in the strip structure, the electrical connecting member being electrically connected to the first connecting portion through the first bonding layer.

[0010] In the embodiments of the present application, the first bonding layer is arranged on a surface of the first connecting portion away from the cell body, the first bonding layer comprising at least two first bonding strips, the at least two first bonding strips being arranged spaced apart along a first direction and being in a strip structure extending along a second direction, and the electrical connecting member is arranged on the first bonding layer, the electrical connecting member extending along the first direction and being arranged intersecting the at least two first bonding strips in the strip structure, so as to connect the electrical connecting member to the first connecting portion through the first bonding layer. Through the above arrangement, the height of the first bonding strip can be reduced, the height of the first bonding strip is relatively low, the first bonding strip cannot support the electrical connecting member, thereby reducing the risk of deviation of the electrical connecting member, improving the reliability of the connection between the electrical connecting member and the first connecting portion, and ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module. Further, through the above arrangement, the reliability of the connection between the second connecting portion adjacent to the first connecting portion and the electrical connecting member can also be improved, thereby further improving the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module. Moreover, the electrical connecting member extends along the first direction and is arranged intersecting or perpendicularly to each of the at least two first bonding strips in the strip structure, the electrical connecting member being connected to the first connecting portion through the first bonding layer, which can increase the contact area between the electrical connecting member and the first connecting portion, thereby improving the reliability of the connection between the electrical connecting member and the first connecting portion.

[0011] Optionally, along the first direction, the first connecting portion is located close to an edge of the cell body, and the second connecting portion is located relatively far away from the edge of the cell body compared with the first connecting portion.

[0012] The first connecting part in the embodiment of the application is located close to the edge of the battery piece body, and the second connecting part is located relatively far from the edge of the battery piece body compared with the first connecting part. The electric connecting piece is connected to the edge area of the battery piece body through the first connecting part, so as to improve the reliability of the connection between the electric connecting piece and the edge area of the battery piece body, and avoid the offset of the electric connecting piece, which causes the photovoltaic module to be defective. Further, the first connecting part has a large area, which can also widen the process window of the first bonding layer printing and improve the fault tolerance rate of the first bonding layer printing the first connecting part. In addition, the first connecting part serves as a mark point in the first bonding layer printing process, and has a large size, which can provide a regular square mark point for a capture camera, so as to further improve the printing yield of the first bonding layer.

[0013] Optionally, along the second direction, the width of the first connecting part is equal to the width of the second connecting part; and along the first direction, the length of the first connecting part is greater than the length of the second connecting part.

[0014] The above arrangement makes the area of the first connecting part greater than the area of the second connecting part. The electric connecting piece is connected to the edge area of the battery piece body through the first connecting part, so as to improve the reliability of the connection between the electric connecting piece and the edge area of the battery piece body, and avoid the offset of the electric connecting piece, which causes the photovoltaic module to be defective. Further, the first connecting part has a large area, which can also widen the process window of the first bonding layer printing and improve the fault tolerance rate of the first bonding layer printing the first connecting part. In addition, the first connecting part serves as a mark point in the first bonding layer printing process, and has a large size, which can provide a regular square mark point for a capture camera, so as to further improve the printing yield of the first bonding layer.

[0015] Optionally, the photovoltaic module further comprises a second bonding layer, wherein the second bonding layer is arranged on the surface of the second connecting part away from the battery piece body, and the second bonding layer comprises a second bonding strip in a strip structure, the second bonding strip extends along the second direction, the second bonding strip is arranged intersecting the electric connecting piece, and the electric connecting piece is electrically connected to the second connecting part through the second bonding layer. Through the above arrangement, the height of the second bonding strip is close to the height of the first bonding strip, and the electric connecting piece will not be lifted by the first bonding strip or the second bonding strip, so as to help improve the reliability of the connection between the electric connecting piece and the first connecting part and the second connecting part, and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0016] Optionally, the second bonding strip and the first bonding strip have the same size. Through the above arrangement, the height of the second bonding strip is more close to the height of the first bonding strip, and the electric connecting piece will not be lifted by the first bonding strip or the second bonding strip, so as to help further improve the reliability of the connection between the electric connecting piece and the first connecting part and the second connecting part, and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0017] Optionally, the at least two first joint strips are spaced apart from each other on the first connecting portion; or, the bottoms of the at least two first joint strips are connected to each other on the first connecting portion. Through the above arrangement, the first joint layer can more reliably connect the electrical connector to the first connecting portion, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0018] Optionally, the first joint strip extends along the second direction and has a rectangular-like structure; and / or, the first joint strip extends along the second direction and has a runway-like structure.

[0019] In the embodiments of the present application, by arranging the first joint strip to have a rectangular-like structure extending along the second direction and / or arranging the first joint strip to have a runway-like structure extending along the second direction, the height consistency of the first joint strip is improved, the uniformity of printing of the first joint strip is improved, the first joint strip is prevented from supporting the electrical connector, thereby further reducing the probability of deviation of the electrical connector and improving the welding yield of the photovoltaic module.

[0020] Further, in the process of processing the photovoltaic module, the metal paste needs to be printed on the surface of the first connecting portion away from the cell body by using the screen printing method to form the first joint strip. In the process of screen printing, if the first joint strip has a rectangular structure, the metal paste is prone to be left in the corner position of the screen, resulting in poor printing. The smooth corners of the rectangular-like structure or the runway-like structure can improve the demolding property of the first joint strip, so that the height of the first joint strip is more uniform.

[0021] In addition, the first joint strip with the rectangular-like structure or the runway-like structure is not easy to print the first connecting portion in the printing process, thereby avoiding the risk of short circuit of the photovoltaic module and improving the yield of the photovoltaic module.

[0022] Optionally, the first joint strip has a polygonal structure, and the number of sides of the polygonal structure is 4N, and N satisfies N≥2. In the process of welding the electrical connector to the first connecting portion, the first joint strip is temporarily melted and pressed by the ejector pin, and there is a risk that the first joint strip and the electrical connector are pressed out of the first connecting portion. Compared with the first joint strip with a quadrilateral structure such as a rectangular structure or a square structure, the first joint strip with a polygonal structure has a farther distance between the corner position and the edge position of the first connecting portion, which can improve the fault tolerance rate of the first joint strip deviating from the first connecting portion, thereby reducing the probability of the risk of short circuit of the photovoltaic module and improving the yield of the photovoltaic module.

[0023] Optionally, the first bonding layer further comprises a third bonding strip, wherein the third bonding strip extends along the first direction, the third bonding strip is located on the central axis of the first connecting part, and the electrical connecting member covers the third bonding strip. The electrical connecting member extends along the first direction, the third bonding strip is located between the electrical connecting member and the first connecting part, and the electrical connecting member covers the third bonding strip. The third bonding strip can further improve the connection reliability between the electrical connecting member and the first connecting part, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0024] Optionally, the first bonding layer is at least one of an I-shaped structure, a T-shaped structure, an L-shaped structure, and a W-shaped structure. In the embodiments of the present application, the first bonding layer is at least one of an I-shaped structure, a T-shaped structure, an L-shaped structure, and a W-shaped structure, so as to further improve the connection reliability between the electrical connecting member and the first connecting part, and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0025] Optionally, along the first direction, the width of the first bonding strip is less than the width of the second connecting part, and / or along the second direction, the length of the first bonding strip is less than the length of the second connecting part. Through the above arrangement, the area of the first bonding strip can be controlled, at least two first bonding strips can be arranged in the first connecting part, so as to reduce the height of the first bonding layer, avoid the first bonding layer supporting the electrical connecting member, reduce the risk of deviation of the electrical connecting member, and thereby improve the yield of the photovoltaic module.

[0026] Optionally, the first surface is the back light surface of the cell body. That is, the photovoltaic module in the embodiments of the present application is a back contact type photovoltaic module, which has the advantage of high photoelectric conversion efficiency.

[0027] In a second aspect, the present application discloses a method for manufacturing a photovoltaic module, the method comprising: providing a cell body, the cell body having a first surface and a second surface arranged oppositely; forming a connecting portion on the first surface of the cell body by screen printing, the connecting portion comprising a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being arranged spaced apart along a first direction, the first connecting portion having an area greater than that of the second connecting portion; forming a first bonding layer on a surface of the first connecting portion away from the cell body by screen printing, during printing, a squeegee moving along a second direction, the first bonding layer comprising at least two first bonding strips of strip structure, the at least two first bonding strips extending along the second direction and being arranged spaced apart along the first direction, the second direction intersecting the first direction; and providing an electrical connecting member, the electrical connecting member being arranged on the first bonding layer and extending along the first direction, the electrical connecting member being arranged intersecting the at least two first bonding strips of strip structure to be electrically connected to the first connecting portion through the first bonding layer.

[0028] Optionally, before the providing the electrical connecting member, the electrical connecting member being arranged on the first bonding layer and extending along the first direction, the electrical connecting member being arranged intersecting the at least two first bonding strips of strip structure to be electrically connected to the first connecting portion through the first bonding layer, the method further comprises: forming a second bonding layer on a surface of the second connecting portion away from the cell body by screen printing, during printing, the squeegee moving along the second direction, the second bonding layer comprising a second bonding strip of strip structure, the second bonding strip extending along the second direction, the second bonding strip being arranged intersecting the electrical connecting member and the electrical connecting member being electrically connected to the second connecting portion through the second bonding layer.

[0029] Optionally, the forming the first bonding layer on the surface of the first connecting portion away from the cell body by screen printing, during printing, the squeegee moving along the second direction, the first bonding layer comprising the at least two first bonding strips of strip structure, the at least two first bonding strips extending along the second direction and being arranged spaced apart along the first direction further comprises: forming the first bonding layer on the surface of the first connecting portion away from the cell body by screen printing, during printing, the squeegee moving along the second direction, the first bonding layer comprising the at least two first bonding strips of strip structure and a third bonding strip of strip structure, the at least two first bonding strips extending along the second direction and being arranged spaced apart along the first direction, the third bonding strip extending along the first direction, and the third bonding strip being located on a central axis of the first connecting portion.

[0030] In a third aspect, the present application discloses a screen, wherein a plurality of screen holes are arranged on the screen, and the plurality of screen holes comprise at least two first screen holes arranged at intervals along a first direction and a plurality of second screen holes, the first screen holes are used to form first joint strips, and the second screen holes are used to form second joint strips; the distance between two adjacent first screen holes is smaller than the distance between two adjacent second screen holes.

[0031] The present application discloses a photovoltaic module, a preparation method of the photovoltaic module and a screen, wherein the photovoltaic module comprises a cell body, the cell body has a first surface and a second surface arranged oppositely, a connecting part arranged on the first surface, the connecting part comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are arranged at intervals along a first direction, the area of the first connecting part is larger than the area of the second connecting part, a first joint layer arranged on the surface of the first connecting part away from the cell body, the first joint layer comprises at least two first joint strips in a strip structure, the at least two first joint strips extend along a second direction and are arranged at intervals along the first direction, the second direction intersects the first direction, and an electrical connecting piece arranged on the first joint layer, the electrical connecting piece extends along the first direction and is arranged intersectingly with the at least two first joint strips in a strip structure, and the electrical connecting piece is electrically connected to the first connecting part through the first joint layer.

[0032] In the present application, the first joint layer is arranged on the surface of the first connecting part away from the cell body, the first joint layer comprises at least two first joint strips in a strip structure, the at least two first joint strips extend along a second direction and are arranged at intervals along a first direction, the electrical connecting piece is arranged on the first joint layer, the electrical connecting piece extends along the first direction and is arranged intersectingly with the at least two first joint strips in a strip structure, and the electrical connecting piece is connected to the first connecting part through the first joint layer. Through the above arrangement, the height of the first joint strip is low, the first joint strip does not support the electrical connecting piece, thereby reducing the probability of deviation of the electrical connecting piece, improving the reliability of the connection between the electrical connecting piece and the first connecting part, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0033] Further, through the above arrangement, the reliability of the connection between the second connecting part adjacent to the first connecting part and the electrical connecting piece can be improved, thereby helping to improve the yield of the photovoltaic module and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0034] In addition, the electrical connecting piece extends along the first direction and is arranged intersectingly with the at least two first joint strips in a strip structure, the electrical connecting piece is connected to the first connecting part through the first joint layer, the contact area between the electrical connecting piece and the first joint layer can be increased, thereby improving the reliability of the connection between the electrical connecting piece and the first connecting part. BRIEF DESCRIPTION OF DRAWINGS

[0035] Fig. 1 shows a structural schematic diagram of the photovoltaic module in the embodiment of the present application;

[0036] Fig. 2 shows a partial structural schematic diagram one of the photovoltaic module in the embodiment of the present application;

[0037] Fig. 3 shows a partial structural schematic diagram two of the photovoltaic module in the embodiment of the present application;

[0038] Fig. 4 shows a structural schematic diagram of the solder pad in the embodiment of the present application;

[0039] Fig. 5 shows a structural schematic diagram one of the screen in the embodiment of the present application;

[0040] Fig. 6 shows a structural schematic diagram two of the screen in the embodiment of the present application;

[0041] Fig. 7 shows a structural schematic diagram three of the screen in the embodiment of the present application;

[0042] Fig. 8 shows a structural schematic diagram of the first screen hole in the screen in the embodiment of the present application;

[0043] Fig. 9 shows another structural schematic diagram of the first screen hole in the screen in the embodiment of the present application;

[0044] Fig. 10 shows a preparation flow chart one of the photovoltaic module in the embodiment of the present application;

[0045] Fig. 11 shows a preparation flow chart two of the photovoltaic module in the embodiment of the present application.

[0046] Reference signs: 10: cell body; 20: connecting part; 21: first connecting part; 22: second connecting part; 30: first bonding layer; 31: first bonding strip; 32: third bonding strip; 40: second bonding strip; 50: first fine grid; 51: second fine grid; 60: screen; 61: first screen hole; 62: second screen hole; 70: electrical connecting part; A: first direction; B: second direction. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope fixed by the present application.

[0048] It should be understood that every feature, structure, characteristic, and / or trait mentioned herein is considered to be a description of a specific embodiment. As such, any feature, structure, characteristic, and / or trait described herein can be combined with any other feature, structure, characteristic, and / or trait described herein in any combination and / or permutation. It is intended that the application embrace all such combinations and permutations.

[0049] Referring to FIG. 1, a structural schematic diagram of the photovoltaic module is shown; referring to FIG. 2, a partial structural schematic diagram of the photovoltaic module is shown; referring to FIG. 3, another partial structural schematic diagram of the photovoltaic module is shown; referring to FIG. 4, a structural schematic diagram of the solder pad is shown.

[0050] As shown in FIGS. 1-4, the photovoltaic module disclosed in the embodiments of the present application includes a cell body 10, the cell body 10 has a first surface and a second surface arranged oppositely; a connecting portion 20, the connecting portion 20 is arranged on the first surface, the connecting portion 20 includes a first connecting portion 21 and a second connecting portion 22, the first connecting portion 21 and the second connecting portion 22 are arranged at intervals along a first direction A, the area of the first connecting portion 21 is larger than the area of the second connecting portion 22; a first bonding layer 30, the first bonding layer 30 is arranged on the surface of the first connecting portion 21 away from the cell body 10, the first bonding layer 30 includes at least two first bonding strips 31 in strip structure, the at least two first bonding strips 31 extend along a second direction B and are arranged at intervals along the first direction A, the second direction B intersects the first direction A; an electrical connecting member 70, the electrical connecting member 70 is arranged on the first bonding layer 30, the electrical connecting member 70 extends along the first direction A and is arranged intersecting the at least two first bonding strips 31 in strip structure, the electrical connecting member 70 is electrically connected to the first connecting portion 21 through the first bonding layer 30.

[0051] The photovoltaic module disclosed in the embodiments of the present application includes a cell body 10, the cell body 10 as the core component of the photovoltaic module can convert solar energy into electrical energy. The cell body 10 has a first surface and a second surface arranged oppositely, when the first surface is a light-receiving surface facing the sunlight, the second surface is a back surface facing away from the sunlight. When the first surface is a back surface facing away from the sunlight, the second surface is a light-receiving surface facing the sunlight.

[0052] Hereinafter, the first surface of the cell body 10 is taken as the back surface facing away from the sunlight, and the second surface of the cell body 10 is taken as the light-receiving surface facing the sunlight as an example to make relevant description of the present application. That is to say, the solar cell disclosed in the embodiments of the present application is a back contact type solar cell.

[0053] As shown in FIGS. 1-4, the photovoltaic module disclosed in the embodiments of the present application further comprises a connecting portion 20 disposed on the first surface of the cell body 10. The connecting portion 20 comprises a first connecting portion 21 and a second connecting portion 22, which are arranged on the first surface of the cell body 10 along the first direction A, and the area of the first connecting portion 21 is greater than that of the second connecting portion 22.

[0054] For example, the first connecting portion 21 and the second connecting portion 22 are both rectangular structures, and along the second direction B, the length of the first connecting portion 21 is equal to that of the second connecting portion 22, and along the first direction A, the width of the first connecting portion 21 is greater than that of the second connecting portion 22.

[0055] For another example, the first connecting portion 21 and the second connecting portion 22 are both quasi-rectangular structures, and along the second direction B, the length of the first connecting portion 21 is equal to that of the second connecting portion 22, and along the first direction A, the width of the first connecting portion 21 is greater than that of the second connecting portion 22. The quasi-rectangular structure refers to a rectangular structure provided with a chamfer, which can be a circular chamfer or a square chamfer.

[0056] Of course, the above are only individual examples of the specific structures of the first connecting portion 21 and the second connecting portion 22, and are not intended to limit the present application. In actual applications, the skilled person can set the specific structures of the first connecting portion 21 and the second connecting portion 22 according to the needs.

[0057] As shown in FIGS. 1-4, the first bonding layer 30 is disposed on the surface of the first connecting portion 21 away from the cell body 10 to improve the reliability of the connection between the electrical connecting member 70 and the first connecting portion 21 through the first bonding layer 30. Specifically, the first bonding layer 30 comprises at least two first bonding strips 31 in strip structure, which are arranged along the first direction A, and the length direction of each first bonding strip 31 extends along the second direction B.

[0058] For example, the first bonding strip 31 in the embodiments of the present application can comprise two, three, four, or five. In the embodiments of the present application, the specific number of the first bonding strip 31 is not limited. In actual applications, the skilled person can set the specific number of the first bonding strip 31 according to the needs.

[0059] The second direction B in the embodiment of the present application intersects the first direction A, and preferably, the second direction B is perpendicular to the first direction A. For example, in the case that the battery piece body 10 is a rectangular structure, the first direction A in the embodiment of the present application can be the width direction of the battery piece body 10, or can be the length direction of the battery piece body 10. If the first direction A is the width direction of the battery piece body 10, the second direction B can be the length direction of the battery piece body 10. If the first direction A is the length direction of the battery piece body 10, the second direction B can be the width direction of the battery piece body 10.

[0060] It should be noted that the first bonding layer 30 in the embodiment of the present application can be a tin layer, or can be other metal layer with conductivity. In the embodiment of the present application, the specific material of the first bonding layer 30 is not limited too much. In actual application, the specific material of the first bonding layer 30 can be set by the technician according to the need. The following will take the first bonding layer 30 as a tin layer as an example to make relevant description of the present application.

[0061] In the processing process of the photovoltaic module, the conductive connecting material, for example, tin paste, can be coated on the surface of the first connecting part 21 away from the battery piece body 10 by screen printing, so as to form the first bonding layer 30, that is, the tin layer, on the surface of the first connecting part 21 away from the battery piece body 10, and the reliability of the connection between the electric connecting piece and the first connecting part 21 is improved through the tin layer. In the process of screen printing, the doctor blade moves along the second direction B, and the moving direction of the doctor blade is the same as the extending direction of the first bonding strip 31.

[0062] The photovoltaic module disclosed in the embodiment of the present application further comprises an electric connecting piece 70, wherein the electric connecting piece 70 is arranged on the first bonding layer 30, the electric connecting piece 70 extends along the first direction A, and the electric connecting piece 70 is arranged to intersect the first bonding strip 31 of the at least two strip structures, so as to connect the electric connecting piece 70 to the first connecting part 21 through the first bonding layer 30.

[0063] The electric connecting piece 70 in the embodiment of the present application extends along the first direction A, the electric connecting piece 70 is arranged on the side of the first bonding layer 30 away from the first connecting part 21, and the electric connecting piece 70 is arranged to intersect the first bonding strip 31 of the at least two strip structures, so as to connect the electric connecting piece 70 to the first connecting part 21 through the first bonding layer 30. That is, the electric connecting piece 70 extends along the first direction A, the first bonding strip 31 is in a strip structure, and the length direction of the first bonding strip 31 extends along the second direction B, so that the extending direction of the electric connecting piece 70 intersects the extending direction of the first bonding strip 31, thereby increasing the contact area between the electric connecting piece 70 and the first bonding strip 31, and making the connection between the electric connecting piece 70 and the first connecting part 30 more reliable.

[0064] It should be noted that the electric connector 70 in the embodiments of the present application can only include the metal strip body, and the electric connector 70 can also include the metal strip body and the metal layer wrapped on the surface of the metal strip body. In the embodiments of the present application, the specific structure of the electric connector 70 is not limited too much. In actual application, the technician can set it according to the needs.

[0065] In the embodiments of the present application, the first bonding layer 30 is arranged on the surface of the first connecting part 21 away from the cell body 10, the first bonding layer 30 includes at least two first bonding strips 31, the at least two first bonding strips 31 are arranged at intervals along the first direction A, and the first bonding strip 31 is in a strip structure extending along the second direction B. The electric connector 70 is arranged on the first bonding layer 30, the electric connector 70 extends along the first direction A, and is arranged intersecting with the at least two strip structures of the first bonding strip 31, so as to connect the electric connector 70 to the first connecting part 21 through the first bonding layer 30. Through the above arrangement, the height of the first bonding strip 31 can be reduced, the height of the first bonding strip 31 is relatively low, the first bonding strip 31 will not support the electric connector 70, thereby reducing the risk of deviation of the electric connector 70, improving the reliability of the connection between the electric connector 70 and the first connecting part 21, and ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0066] Further, through the above arrangement, the reliability of the connection between the second connecting part 22 adjacent to the first connecting part 21 and the electric connector 70 can also be improved, thereby further improving the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0067] In addition, the electric connector 70 extends along the first direction A and is arranged intersecting with the at least two strip structures of the first bonding strip 31, and the electric connector 70 is connected to the first connecting part 21 through the first bonding layer 30, which can increase the contact area between the electric connector 70 and the first bonding layer 30, thereby improving the reliability of the connection between the electric connector 70 and the first connecting part 21.

[0068] Optionally, as shown in FIGS. 1-4, along the first direction A, the first connecting part 21 is located at a position close to the edge of the cell body 10; compared with the first connecting part 21, the second connecting part 22 is located at a position relatively far away from the edge of the cell body 10.

[0069] As shown in FIGS. 1-4, along the first direction A, the cell body 10 has oppositely arranged first and second side edges, wherein the first connecting part 21 is located in the region close to the first or second side edge of the cell body 10. Compared with the first connecting part 21, the second connecting part 22 is located in the region relatively far away from the first and second side edges of the cell body 10.

[0070] It should be noted that the first connecting part 21 and the second connecting part 22 in the embodiment of the present application are generally rectangular structures, and the area of the first connecting part 21 is greater than the area of the second connecting part 22. The first connecting part 21 is located close to the edge of the battery piece body 10, and the second connecting part 22 is located relatively far away from the edge of the battery piece body 10 compared with the first connecting part 21. The electrical connecting piece 70 is connected to the edge area of the battery piece body 10 through the first connecting part 21, so as to improve the connection reliability between the electrical connecting piece 70 and the edge area of the battery piece body 10, and avoid the offset of the electrical connecting piece 70, which causes the photovoltaic module to be defective.

[0071] Further, the first connecting part 21 has a larger area, which can also widen the process window of printing of the first bonding layer 30 and improve the fault tolerance rate of printing of the first connecting part 21 by the first bonding layer 30.

[0072] In addition, the first connecting part 21 serves as a mark point in the printing process of the first bonding layer 30, and has a larger size, which can provide a regular square mark point for a capture camera, so as to further improve the printing yield of the first bonding layer 30.

[0073] Optionally, as shown in FIGS. 1 to 4, along the second direction B, the width of the first connecting part 21 is equal to the width of the second connecting part 22; along the first direction A, the length of the first connecting part 21 is greater than the length of the second connecting part 22.

[0074] As shown in FIGS. 1 to 4, the first connecting part 21 and the second connecting part 22 in the embodiment of the present application are both rectangular structures, and the first connecting part 21 and the second connecting part 22 of the rectangular structure are arranged at intervals along the first direction A. Among them, along the second direction B, the width of the first connecting part 21 is equal to the width of the second connecting part 22. And along the first direction A, the length of the first connecting part 21 is greater than the length of the second connecting part 22. So that the area of the first connecting part 21 is greater than the area of the second connecting part 22. The electrical connecting piece 70 is connected to the edge area of the battery piece body 10 through the first connecting part 21, so as to improve the connection reliability between the electrical connecting piece 70 and the edge area of the battery piece body 10, and avoid the offset of the electrical connecting piece 70, which causes the photovoltaic module to be defective.

[0075] Further, the first connecting part 21 has a larger area, which can also widen the process window of printing of the first bonding layer 30 and improve the fault tolerance rate of printing of the first connecting part 21 by the first bonding layer 30. In addition, the first connecting part 21 serves as a mark point in the printing process of the first bonding layer 30, and has a larger size, which can provide a regular square mark point for a capture camera, so as to further improve the printing yield of the first bonding layer 30.

[0076] Optionally, as shown in FIGS. 1-4, the photovoltaic module in the embodiment of the present application further comprises a second bonding layer, wherein the second bonding layer is arranged on the surface of the second connecting portion 22 away from the cell body 10, and the second bonding layer comprises a second bonding strip 40 in a strip structure, the second bonding strip 40 extends along the second direction B, and the second bonding strip 40 is arranged intersecting with the electrical connecting piece 70, and the electrical connecting piece 70 is electrically connected to the second connecting portion 22 through the second bonding layer.

[0077] As shown in FIGS. 1-4, in the embodiment of the present application, the second bonding layer is arranged on the surface of the second connecting portion 22 away from the cell body 10, and the electrical connecting piece 70 is connected to the second connecting portion 22 through the second bonding layer, so as to improve the connection reliability between the electrical connecting piece 70 and the second connecting portion 22.

[0078] In the embodiment of the present application, the second bonding layer comprises a second bonding strip 40 in a strip structure, and the second bonding strip 40 extends along the second direction B. Through the above arrangement, the height of the second bonding strip 40 is close to the height of the first bonding strip 31, and the electrical connecting piece 70 will not be lifted by the first bonding strip 31 or the second bonding strip 40, thereby helping to improve the connection reliability between the electrical connecting piece 70 and the first connecting portion 21 and the second connecting portion 22, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0079] Optionally, as shown in FIGS. 1-4, the size of the second bonding strip 40 and the first bonding strip 31 in the embodiment of the present application is the same.

[0080] As shown in FIGS. 1-4, the size of the second bonding strip 40 and the first bonding strip 31 in the embodiment of the present application is the same. For example, when the first bonding strip 31 is in a rectangular structure, the second bonding strip 40 is also in a rectangular structure, and the length and width of the first bonding strip 31 are equal to the length and width of the second bonding strip 40, respectively. Through the above arrangement, the height of the second bonding strip 40 is more close to the height of the first bonding strip 31, and the electrical connecting piece 70 will not be lifted by the first bonding strip 31 or the second bonding strip 40, thereby helping to further improve the connection reliability between the electrical connecting piece 70 and the first connecting portion 21 and the second connecting portion 22, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0081] It should be noted that the rectangular structure in the embodiment of the present application refers to a rectangular structure with chamfers arranged at four corners, and the chamfers can be square chamfers or circular chamfers.

[0082] Optionally, at least two first bonding strips 31 are spaced apart from each other on the first connecting portion 21; or the bottoms of at least two first bonding strips 31 are connected to each other on the first connecting portion 21.

[0083] The first bonding layer 30 in the embodiments of the present application can include at least two first bonding strips 31 arranged at intervals along the first direction A, and the at least two first bonding strips 31 are arranged at intervals on the first connecting portion 21. That is, the at least two first bonding strips 31 are connected to the electrical connecting piece 70 respectively, and no other connecting structure is arranged between the at least two first bonding strips 31.

[0084] Alternatively, the first bonding layer 30 can also include at least two first bonding strips 31 arranged at intervals along the first direction A, and the bottoms of the at least two first bonding strips 31 are connected to each other on the first connecting portion 21. Exemplarily, one bonding strip extending along the first direction A can be arranged to connect the at least two first bonding strips 31 together, and the bonding strip and the at least two first bonding strips 31 are connected to the electrical connecting piece 70, so as to further improve the reliability of the connection between the first connecting portion 21 and the electrical connecting piece 70 and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0085] Optionally, as shown in FIGS. 1 to 4, the first bonding strip 31 in the embodiments of the present application extends along the second direction B and has a rectangular structure; and / or, the first bonding strip 31 extends along the second direction B and has a runway structure.

[0086] As shown in FIGS. 1 to 4, in the embodiments of the present application, the first bonding strip 31 can be arranged to have a rectangular structure extending along the second direction B. The rectangular structure can be a rectangular structure with circular chamfers arranged at four corners of the rectangular structure. The rectangular structure can be a rectangular structure with square chamfers arranged at four corners of the rectangular structure. The rectangular structure can also be a rectangular structure with other shape chamfers arranged at four corners of the rectangular structure. In the embodiments of the present application, the specific type of chamfer arranged at the four corners of the rectangular structure is not limited too much. In actual application, the technician can arrange as needed.

[0087] In the embodiments of the present application, the first bonding strip 31 can also be arranged to have a runway structure extending along the second direction B. It can be understood that the runway structure includes a rectangular structure extending along the second direction B and arc-shaped structures connected to two ends of the rectangular structure respectively.

[0088] In the embodiments of the present application, by arranging the first bonding strip 31 to have a rectangular structure extending along the second direction B and / or arranging the first bonding strip 31 to have a runway structure extending along the second direction B, the height consistency of the first bonding strip 31 is improved, the uniformity of printing of the first bonding strip 31 is improved, and the first bonding strip 31 is prevented from supporting the electrical connecting piece, so as to further reduce the probability of the electrical connecting piece deviating and improve the welding yield of the photovoltaic module.

[0089] Further, in the process of processing the photovoltaic module, the metal paste is printed on the surface of the first connecting part 21 away from the cell body 10 by screen printing to form the first bonding strip 31. In the process of screen printing, if the first bonding strip 31 is in a rectangular structure, the metal paste is easy to remain in the corner position of the screen plate, resulting in poor printing. The smooth corners of the quasi-rectangular structure or the racetrack structure can improve the demolding property of the first bonding strip 31, and make the height of the first bonding strip 31 more uniform.

[0090] In addition, the first bonding strip 31 in the quasi-rectangular structure or the racetrack structure is not easy to print the first connecting part 21 in the process of printing, so as to avoid the risk of short circuit of the photovoltaic module and improve the yield of the photovoltaic module.

[0091] Optionally, as shown in FIGS. 1-4, the first bonding strip 31 in the embodiment of the application is in a polygonal structure, wherein the number of sides of the polygonal structure is 4N, and N satisfies N≥2.

[0092] As shown in FIGS. 1-4, in the embodiment of the application, the first bonding strip 31 is arranged in a polygonal structure, and the number of sides of the polygonal structure is 4N, wherein N≥2. In the process of welding the electrical connecting piece to the first connecting part 21, the first bonding strip 31 will be temporarily melted and pressed by the ejector pin, and there is a risk that the first bonding strip 31 and the electrical connecting piece are pressed away from the first connecting part 21. The first bonding strip 31 in the polygonal structure is farther away from the edge position of the first connecting part 21 than the first bonding strip 31 in the quadrilateral structure such as the rectangular structure or the square structure, which can improve the fault tolerance of the first bonding strip 31 deviating from the first connecting part 21, thereby reducing the probability of short circuit risk of the photovoltaic module and improving the yield of the photovoltaic module.

[0093] For example, when N=2, the first bonding strip 31 is in an octagonal structure. When N=3, the first bonding strip 31 is in a dodecagonal structure. When N=4, the first bonding strip 31 is in a hexadecagonal structure. Of course, the above is only an individual example of the specific structure of the first bonding strip 31 in the embodiment of the application, and is not a limitation of the application. In actual application, the technician can also set the specific value of N according to actual needs to determine the specific structure of the first bonding strip 31.

[0094] Optionally, as shown in FIG. 3, the first bonding layer 30 in the embodiment of the application further comprises a third bonding strip 32, wherein the third bonding strip 32 extends along the first direction A, and the third bonding strip 32 is located on the central axis of the first connecting part 21, and the electrical connecting piece 70 covers the third bonding strip 32.

[0095] The first bonding layer 30 in the embodiments of the present application can further include a third bonding strip 32, the third bonding strip 32 has a long strip structure extending along the first direction A, and the third bonding strip 32 is located on the central axis of the first connecting part 21. The electrical connecting piece 70 extends along the first direction A, and the electrical connecting piece 70 covers the third bonding strip 32, that is, the third bonding strip 32 is located between the electrical connecting piece 70 and the first connecting part 21, and the third bonding strip 32 can further improve the connection reliability between the electrical connecting piece 70 and the first connecting part 21, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0096] Optionally, the first bonding layer 30 has at least one of an I-shaped structure, a T-shaped structure, a L-shaped structure, and a W-shaped structure.

[0097] Exemplarily, when the first bonding layer 30 includes two first bonding strips 31, the two first bonding strips 31 both extend along the second direction B and are arranged at intervals along the first direction A. The third bonding strip 32 extends along the first direction A and is connected to the two first bonding strips 31, so as to form a first bonding layer 30 having a U-shaped structure, or a first bonding layer 30 having a T-shaped structure, or a first bonding layer 30 having an I-shaped structure. When the first bonding layer 30 includes three first bonding strips 31, the three first bonding strips 31 both extend along the second direction B and are arranged at intervals along the first direction A. The third bonding strip 32 and the three first bonding strips 31 can form a first bonding layer 30 having a W-shaped structure.

[0098] In the embodiments of the present application, the first bonding layer 30 is arranged to have at least one of an I-shaped structure, a T-shaped structure, a L-shaped structure, and a W-shaped structure, so as to further improve the connection reliability between the electrical connecting piece 70 and the first connecting part 21 and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0099] It should be noted that the third bonding strip 32 in the embodiments of the present application is at least partially arranged between the electrical connecting piece 70 and the first connecting part 21, that is, the third bonding strip 32 is at least partially located below the electrical connecting piece 70, so as to improve the connection reliability between the first connecting part 21 and the electrical connecting piece 70 through the third bonding strip 32.

[0100] Optionally, as shown in FIGS. 1-4, along the first direction A, the width of the first bonding strip 31 is less than the width of the second connecting part 22; and / or, along the second direction B, the length of the first bonding strip 31 is less than the length of the second connecting part 22.

[0101] As shown in FIGS. 1-4, in the embodiment of the present application, the width of the first bonding strip 31 is set to be less than the width of the second connecting portion 22 along the first direction A, and / or the length of the first bonding strip 31 is set to be less than the length of the second connecting portion 22 along the second direction B. By the above setting, the area of the first bonding strip 31 can be controlled, at least two first bonding strips 31 can be arranged in the first connecting portion 21, the height of the first bonding layer 30 is reduced, the first bonding layer 30 is prevented from supporting the electrical connecting member 70, the risk of the electrical connecting member 70 being deviated is reduced, and thus the yield of the photovoltaic module is improved.

[0102] Optionally, the first surface in the embodiment of the present application is the back surface of the cell body 10. That is, the photovoltaic module in the embodiment of the present application is a back contact type photovoltaic module, which has the advantage of high photoelectric conversion efficiency.

[0103] Optionally, a plurality of first fine grids 50 and a plurality of second fine grids 51 are arranged on the first surface of the cell body 10, the plurality of first fine grids 50 and the plurality of second fine grids 51 extend along the second direction B and are alternately arranged along the first direction A; the first fine grid 50 is connected to the connecting portion 20; and at least one second fine grid 51 is located between the adjacent first connecting portion 21 and the second connecting portion 22.

[0104] As shown in FIGS. 1-4, in the embodiment of the present application, a plurality of first fine grids 50 and a plurality of second fine grids 51 are arranged on the first surface of the cell body 10, the plurality of first fine grids 50 and the plurality of second fine grids 51 extend along the second direction B and are alternately arranged along the first direction A. The current generated by the plurality of first fine grids 50 and the plurality of second fine grids 51 is collected.

[0105] The first fine grid 50 is connected to the connecting portion 20, and the current collected by the first fine grid 50 is collected through the connecting portion 20. That is, the first connecting portion 21 is connected to at least one first fine grid 50, and the second connecting portion 22 is also connected to at least one first fine grid 50, so as to collect the current collected by the first fine grid 50 through the first connecting portion 21 and the second connecting portion 22, and transmit the collected current to the electrical connecting member, and transmit the current to the external circuit through the electrical connecting member.

[0106] As shown in FIGS. 1-4, at least one second fine grid 51 is located between the adjacent first connecting portion 21 and the second connecting portion 22. In order to avoid the second fine grid 51 being connected to the first connecting portion 21 or the second connecting portion 22, which causes the photovoltaic module to have a short circuit phenomenon.

[0107] Optionally, the electrical connecting member in the embodiment of the present application is in direct contact with the at least two first bonding strips 31.

[0108] The electric connecting piece in the embodiment of the present application is in direct contact with the at least two first joint strips 31, so as to connect the electric connecting piece to the first connecting part 21 through the at least two first joint strips 31, thereby improving the reliability of the connection between the electric connecting piece and the first connecting part 21.

[0109] Referring to FIG. 5, a structure diagram of the screen printing plate in the embodiment of the present application is shown; referring to FIG. 6, another structure diagram of the screen printing plate in the embodiment of the present application is shown; referring to FIG. 7, a structure diagram of the screen printing plate in the embodiment of the present application is shown; referring to FIG. 8, a structure diagram of the first mesh hole in the screen printing plate in the embodiment of the present application is shown; referring to FIG. 9, another structure diagram of the first mesh hole in the screen printing plate in the embodiment of the present application is shown.

[0110] As shown in FIGS. 5 to 9, the embodiment of the present application also discloses a screen printing plate 60, which is provided with a plurality of mesh holes, the plurality of mesh holes comprising at least two first mesh holes 61 and a plurality of second mesh holes 62 arranged at intervals along a first direction A, the first mesh holes being used to form the first joint strips 31, and the second mesh holes being used to form the second joint strip 40, the distance between two adjacent first mesh holes 61 being less than the distance between two adjacent second mesh holes 62.

[0111] The embodiment of the present application also discloses a screen printing plate 60, which is used to print the metal paste on the surface of the first connecting part 21 away from the battery piece body 10 and the surface of the second connecting part 22 away from the battery piece body 10, so as to form at least two first joint strips 31 on the surface of the first connecting part 21 away from the battery piece body 10 and one second joint strip 40 on the surface of the second connecting part 22 away from the battery piece body 10. In this way, the metal paste is less likely to be left at the corner position of the screen printing plate 60, and the printing yield of the photovoltaic module is higher.

[0112] Further, the screen printing plate 60 disclosed in the embodiment of the present application is used to print the metal paste on the surface of the first connecting part 21 away from the battery piece body 10, so as to form at least two first joint strips 31 on the surface of the first connecting part 21 away from the battery piece body 10. The screen printing plate 60 is also used to print the metal paste on the surface of the second connecting part 22 away from the battery piece body 10, so as to form one second joint strip 40 on the surface of the second connecting part 22 away from the battery piece body 10. In this way, the demolding property of the first joint strips 31 and the second joint strip 40 is better, the height of the first joint strips 31 and the second joint strip 40 is more consistent, and the first joint strips 31 will not support the electric connecting piece, thereby reducing the risk of the electric connecting piece deviating, improving the reliability of the connection between the electric connecting piece and the first connecting part 21 and the second connecting part 22, and improving the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0113] Further, in the printing process, the first joint strips 31 are less likely to be printed out of the first connecting part 21.

[0114] It should be noted that, in the embodiment of the present application, the distance between two adjacent first meshes 61 is less than the distance between two adjacent second meshes 62. The first joint strip 31 printed by the first mesh 61 can be located on the first connecting portion 21, and the second joint strip 40 printed by the second mesh 62 can be located on the second connecting portion 22.

[0115] Referring to FIG. 10, a flowchart of a preparation process of the photovoltaic module in the embodiment of the present application is shown.

[0116] The embodiment of the present application discloses a preparation method of a photovoltaic module, and the method comprises the following steps:

[0117] In step 101, a cell body 10 is provided, and the cell body 10 has a first surface and a second surface arranged oppositely.

[0118] The photovoltaic module disclosed in the embodiment of the present application comprises a cell body 10, which is a core component of the photovoltaic module and can convert solar energy into electric energy. The cell body 10 has a first surface and a second surface arranged oppositely. When the first surface is a light-receiving surface facing the sunlight, the second surface is a back surface facing away from the sunlight. When the first surface is a back surface facing away from the sunlight, the second surface is a light-receiving surface facing the sunlight.

[0119] Hereinafter, the first surface of the cell body 10 is taken as the back surface facing away from the sunlight, and the second surface of the cell body 10 is taken as the light-receiving surface facing the sunlight as an example to make relevant description of the present application. That is to say, the solar cell disclosed in the embodiment of the present application is a back contact type solar cell.

[0120] In step 102, a connecting portion 20 is formed on the first surface of the cell body 10 by means of screen printing, and the connecting portion 20 comprises a first connecting portion 21 and a second connecting portion 22. The first connecting portion 21 and the second connecting portion 22 are arranged at intervals along a first direction A, and the area of the first connecting portion 21 is greater than the area of the second connecting portion 22.

[0121] In the preparation process of the photovoltaic module, a connecting portion 20 is formed on the first surface of the cell body 10 by means of screen printing, and the connecting portion 20 comprises a first connecting portion 21 and a second connecting portion 22. The first connecting portion 21 and the second connecting portion 22 are arranged at intervals along a first direction A on the first surface of the cell body 10, and the area of the first connecting portion 21 is greater than the area of the second connecting portion 22.

[0122] For example, the first connecting part 21 and the second connecting part 22 are both rectangular structures, along the second direction B, the length of the first connecting part 21 and the length of the second connecting part 22 are equal, along the first direction A, the width of the first connecting part 21 is greater than the width of the second connecting part 22.

[0123] For another example, the first connecting part 21 and the second connecting part 22 are both quasi-rectangular structures, along the second direction B, the length of the first connecting part 21 and the length of the second connecting part 22 are equal, along the first direction A, the width of the first connecting part 21 is greater than the width of the second connecting part 22. The quasi-rectangular structure refers to a rectangular structure provided with a chamfer, which can be a circular chamfer or a square chamfer.

[0124] Of course, the above is only an individual example of the specific structure of the first connecting part 21 and the second connecting part 22, and is not a limitation of the present application. In actual application, the technical personnel can also set the specific structure of the first connecting part 21 and the second connecting part 22 according to the needs.

[0125] In step 103, the first bonding layer 30 is formed on the surface of the first connecting part 21 away from the battery piece body 10 by screen printing, and during printing, the squeegee moves along the second direction B. The first bonding layer 30 includes at least two first bonding strips 31 in strip structure, and the at least two first bonding strips 31 extend along the second direction B and are arranged at intervals along the first direction A. The second direction B intersects the first direction A.

[0126] The first bonding layer 30 is formed on the surface of the first connecting part 21 away from the battery piece body 10 by screen printing, so as to improve the reliability of the connection between the electrical connecting piece 70 and the first connecting part 21 through the first bonding layer 30. Specifically, during printing, the squeegee moves along the second direction B. The first bonding layer 30 includes at least two first bonding strips 31 in strip structure, and the at least two first bonding strips 31 are arranged at intervals along the first direction A, and the length direction of each first bonding strip 31 extends along the second direction B, so that the movement direction of the squeegee is consistent with the length direction of the first bonding strip 31.

[0127] For example, the first bonding strip 31 in the embodiment of the present application can include two, three, four, or five. In the embodiment of the present application, the specific number of the first bonding strip 31 is not limited too much. In actual application, the technical personnel can set the specific number of the first bonding strip 31 according to the needs.

[0128] The second direction B in the embodiment of the present application intersects the first direction A, and preferably, the second direction B is perpendicular to the first direction A. For example, in the case that the battery piece body 10 is a rectangular structure, the first direction A in the embodiment of the present application can be the width direction of the battery piece body 10, or can be the length direction of the battery piece body 10. If the first direction A is the width direction of the battery piece body 10, the second direction B can be the length direction of the battery piece body 10. If the first direction A is the length direction of the battery piece body 10, the second direction B can be the width direction of the battery piece body 10.

[0129] It should be noted that the first bonding layer 30 in the embodiment of the present application can be a tin layer, or can be other metal layer with conductivity. In the embodiment of the present application, the specific material of the first bonding layer 30 is not limited too much. In actual application, the specific material of the first bonding layer 30 can be set by the technician according to the need. The following will take the first bonding layer 30 as a tin layer as an example to make related description of the present application.

[0130] In the processing process of the photovoltaic module, the conductive connecting material, for example, tin paste, can be coated on the surface of the first connecting part 21 away from the battery piece body 10 by screen printing, so as to form the first bonding layer 30, that is, the tin layer, on the surface of the first connecting part 21 away from the battery piece body 10, and the reliability of the connection between the electric connecting piece 70 and the first connecting part 21 is improved through the tin layer.

[0131] In step 104, the electric connecting piece 70 is provided, the electric connecting piece 70 is arranged on the first bonding layer 30, the electric connecting piece 70 extends along the first direction A, and the electric connecting piece 70 is arranged intersecting the first bonding strips 31 of the at least two strip structures, so as to be electrically connected to the first connecting part 21 through the first bonding layer 30.

[0132] The electric connecting piece 70 in the embodiment of the present application extends along the first direction A, the electric connecting piece 70 is arranged on the side of the first bonding layer 30 away from the first connecting part 21, and the electric connecting piece 70 is arranged intersecting the first bonding strips 31 of the at least two strip structures, so as to connect the electric connecting piece 70 to the first connecting part 21 through the first bonding layer 30. That is, the electric connecting piece 70 extends along the first direction A, the first bonding strips 31 are in a strip structure, and the first bonding strips 31 of the strip structure extend along the second direction B, so that the second bonding strips 31 intersect the electric connecting piece 70, thereby increasing the contact area between the electric connecting piece 70 and the first bonding strips 31, and making the connection between the electric connecting piece 70 and the first connecting part 21 more reliable.

[0133] It should be noted that the electric connector 70 in the embodiment of the present application can only include the metal strip body, and the electric connector 70 can also include the metal strip body and the metal layer wrapped on the surface of the metal strip body. In the embodiment of the present application, the specific structure of the electric connector 70 is not limited too much. In actual application, the technician can set it according to the needs.

[0134] In the embodiment of the present application, the first bonding layer 30 is arranged on the surface of the first connecting part 21 away from the battery piece body 10 by means of screen printing. When printing, the squeegee moves along the second direction B. The first bonding layer 30 includes at least two first bonding strips 31 in strip structure, and the at least two first bonding strips 31 extend along the second direction B and are arranged at intervals along the first direction A, that is, the movement direction of the squeegee is the same as the extension direction of the first bonding strip 31. The electric connector 70 is arranged on the side of the first bonding layer 30 away from the first connecting part 21, and the electric connector 70 is connected to the first connecting part 21 through the first bonding layer 30. Through the above arrangement, the height of the first bonding strip 31 can be reduced, the height of the first bonding strip 31 is lower, the first bonding strip 31 will not support the electric connector 70, thereby reducing the risk of deviation of the electric connector 70, improving the reliability of the connection between the electric connector 70 and the first connecting part 21, ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0135] Further, through the above arrangement, the reliability of the connection between the second connecting part 22 adjacent to the first connecting part 21 and the electric connector 70 can also be improved, thereby further improving the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0136] In addition, the electric connector 70 extends along the first direction A and is arranged intersecting the at least two first bonding strips 31 in strip structure, and the electric connector 70 is connected to the first connecting part 21 through the first bonding layer 30, which can increase the contact area between the electric connector 70 and the first bonding layer 30, thereby improving the reliability of the connection between the electric connector 70 and the first connecting part 21.

[0137] Referring to FIG. 11, a preparation flowchart II of the photovoltaic module in the embodiment of the present application is shown.

[0138] Step 201, providing a battery piece body 10, the battery piece body 10 has a first surface and a second surface arranged opposite to each other.

[0139] The step 201 in the embodiment of the present application is the same as the step 101 in the above-mentioned embodiment, and the related content is referred to the above-mentioned embodiment. Here, it will not be repeated.

[0140] In step 202, the connecting part 20 is formed on the first surface of the battery piece body 10 by screen printing, the connecting part 20 comprises a first connecting part 21 and a second connecting part 22, the first connecting part 21 and the second connecting part 22 are arranged at intervals along the first direction A, and the area of the first connecting part 21 is greater than the area of the second connecting part 22.

[0141] The step 202 in the embodiment of the present application is the same as the step 102 in the above-mentioned embodiment, and the related content is referred to the above-mentioned embodiment. Here, it will not be repeated.

[0142] In step 203, the first joint layer 30 is formed on the surface of the first connecting part 21 away from the battery piece body 10 by screen printing, when printing, the squeegee moves along the second direction B, the first joint layer 30 comprises at least two first joint strips 31 and a third joint strip 32 in strip structure, the at least two first joint strips 31 extend along the second direction B and are arranged at intervals along the first direction A, the third joint strip 32 extends along the first direction A, and the third joint strip 32 is located on the central axis of the first connecting part 21.

[0143] The first joint layer 30 is formed on the surface of the first connecting part 21 away from the battery piece body 10 by screen printing, so as to improve the connection reliability between the electric connecting piece 70 and the first connecting part 21 through the first joint layer 30. Specifically, the first joint layer 30 comprises at least two first joint strips 31 and a third joint strip 32 in strip structure, the at least two first joint strips 31 extend along the second direction B and are arranged at intervals along the first direction A. When printing, the squeegee moves along the second direction B, so that the moving direction of the squeegee is the same as the length direction of the first joint strip 31. The third joint strip 32 extends along the first direction A, and the third joint strip 32 is located on the central axis of the first connecting part 21.

[0144] That is, the first joint layer 30 in the embodiment of the present application can also comprise the third joint strip 32, the third joint strip 32 is in long strip structure extending along the first direction A, and the third joint strip 32 is located on the central axis of the first connecting part 21. The electric connecting piece 70 extends along the first direction A, the third joint strip 32 is located between the electric connecting piece 70 and the first connecting part 21, and the third joint strip 32 can further improve the connection reliability between the electric connecting piece 70 and the first connecting part 21, so as to improve the photoelectric conversion efficiency of the photovoltaic module.

[0145] In step 204, the second joint layer is formed on the surface of the second connecting part 22 away from the battery piece body 10 by screen printing, when printing, the squeegee moves along the second direction B, the second joint layer comprises a second joint strip 40 in strip structure, the second joint strip 40 extends along the second direction B, the second joint strip 40 is arranged intersecting with the electric connecting piece 70, and the electric connecting piece 70 is electrically connected to the second connecting part 22 through the second joint layer.

[0146] In the embodiment of the present application, the second bonding layer is arranged on the surface of the second connecting part 22 away from the battery piece body 10 by screen printing, and the electric connecting piece 70 is connected to the second connecting part 22 through the second bonding layer, so as to improve the reliability of the connection between the electric connecting piece 70 and the second connecting part 22.

[0147] The second bonding layer in the embodiment of the present application comprises a second bonding strip 40 in a strip structure, and the second bonding strip 40 extends along the second direction B. During printing, the doctor blade moves along the second direction B, so that the moving direction of the doctor blade is the same as the extending direction of the second bonding strip 40. Through the above arrangement, the height of the second bonding strip 40 is close to the height of the first bonding strip 31, and the electric connecting piece 70 will not be lifted by the first bonding strip 31 or the second bonding strip 40, thereby helping to improve the reliability of the connection between the electric connecting piece 70 and the first connecting part 21 and the second connecting part 22, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0148] In step 205, the electric connecting piece 70 is arranged on the first bonding layer 30, and the electric connecting piece 70 extends along the first direction A and intersects with the at least two first bonding strips 31 in a strip structure, so as to be electrically connected to the first connecting part 21 through the first bonding layer 30.

[0149] In step 205, the electric connecting piece 70 is arranged on the first bonding layer 30, and the electric connecting piece 70 extends along the first direction A and intersects with the at least two first bonding strips 31 in a strip structure, so as to be electrically connected to the first connecting part 21 through the first bonding layer 30.

[0150] In the embodiment of the present application, the electric connecting piece 70 extends along the first direction A, and the electric connecting piece 70 is arranged on the side of the first bonding layer 30 away from the first connecting part 21 and on the side of the second bonding layer away from the second connecting part 22, so that the extending direction of the electric connecting piece 70 intersects with the extending direction of the first bonding strip 31 and the second bonding strip 40. The electric connecting piece 70 is connected to the first connecting part 21 through the first bonding layer 30 and connected to the second connecting part 22 through the second bonding layer. The contact area of the electric connecting piece 70 with the first bonding strip 31 and the contact area of the electric connecting piece 70 with the second bonding strip 40 are increased, so that the connection between the electric connecting piece 70 and the first bonding strip 31 is more reliable and the connection between the electric connecting piece 70 and the second bonding strip 40 is more reliable.

[0151] It should be noted that the electric connecting piece 70 in the embodiment of the present application can only comprise a metal strip body, and the electric connecting piece 70 can also comprise a metal strip body and a metal layer wrapped on the surface of the metal strip body. In the embodiment of the present application, the specific structure of the electric connecting piece 70 is not limited too much. In actual application, the technical personnel can set it according to the needs.

[0152] It should be noted that each of the embodiments in the present specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be mutually referred to.

[0153] Although the optional embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to cover all optional embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0154] Finally, it should also be noted that in this document, the relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply that there is any such actual relationship or order between the entities. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such article or terminal device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the article or terminal device including the element.

[0155] The above describes the technical solutions provided by the present application in detail. The principles and implementation manners of the present application are described by using specific examples in this document. For those skilled in the art, the principles and implementation manners of the present application will have changes in specific implementation manners and application scope. In summary, the content of the present specification should not be understood as a limitation of the present application.

Claims

1. A photovoltaic module, characterized by, The photovoltaic module comprises: a cell body having a first surface and a second surface arranged oppositely; a connecting portion arranged on the first surface, the connecting portion comprising a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being arranged at intervals along a first direction, the first connecting portion having an area greater than that of the second connecting portion; a first bonding layer arranged on a surface of the first connecting portion away from the cell body, the first bonding layer comprising at least two first bonding strips in a strip structure, the at least two first bonding strips extending along a second direction and being arranged at intervals along the first direction, the second direction intersecting the first direction; an electrical connecting member arranged on the first bonding layer, the electrical connecting member extending along the first direction and being arranged intersecting the at least two first bonding strips in a strip structure, the electrical connecting member being electrically connected to the first connecting portion through the first bonding layer.

2. The photovoltaic module of claim 1, wherein, In the first direction, the first connecting portion is located close to an edge of the cell body. Compared with the first connecting portion, the second connecting portion is located relatively far away from the edge of the cell body.

3. The photovoltaic module of claim 1, wherein, In the second direction, the width of the first connecting portion is equal to that of the second connecting portion. In the first direction, the length of the first connecting portion is greater than that of the second connecting portion.

4. The photovoltaic module according to any of claims 1-3, characterized in that, The photovoltaic module further comprises a second bonding layer, wherein the second bonding layer is arranged on a surface of the second connecting portion away from the cell body, the second bonding layer comprising a second bonding strip in a strip structure, the second bonding strip extending along the second direction, the second bonding strip being arranged intersecting the electrical connecting member, and the electrical connecting member being electrically connected to the second connecting portion through the second bonding layer.

5. The photovoltaic module of claim 4, wherein, The second bonding strip and the first bonding strip are of the same size.

6. The photovoltaic module of claim 1, wherein, The at least two first bonding strips are spaced from each other on the first connecting portion. Alternatively, the bottoms of the at least two first bonding strips are connected to each other on the first connecting portion.

7. The photovoltaic module of claim 1, wherein, The first bonding strip extends along the second direction and has a quasi-rectangular structure. And / or, the first bonding strip extends along the second direction and has a runway structure.

8. The photovoltaic module of claim 1, wherein, The first bonding strip is in a polygonal structure, wherein the polygonal structure has 4N sides, and N satisfies N≥2.

9. The photovoltaic module of claim 1, wherein, The first bonding layer further comprises a third bonding strip, wherein the third bonding strip extends along the first direction, and the third bonding strip is located on a central axis of the first connecting portion, and the electrical connecting member covers the third bonding strip.

10. The photovoltaic module of claim 9, wherein, The first bonding layer has at least one of an I-shaped structure, a T-shaped structure, a L-shaped structure, and a W-shaped structure.

11. The photovoltaic module of claim 1, wherein, In the first direction, the width of the first bonding strip is less than that of the second connecting portion. And / or, in the second direction, the length of the first bonding strip is less than that of the second connecting portion.

12. The photovoltaic module of claim 1, wherein, The first surface is a back light surface of the cell body.

13. A method of making a photovoltaic module, characterized by, The method comprises: providing a cell body having a first surface and a second surface arranged oppositely; Forming a connecting part on the first surface of the cell body by screen printing, the connecting part comprising a first connecting part and a second connecting part, the first connecting part and the second connecting part being arranged along a first direction, the first connecting part having an area greater than that of the second connecting part; Forming a first bonding layer on the surface of the first connecting part away from the cell body by screen printing, the first bonding layer comprising at least two first bonding strips of strip structure, the at least two first bonding strips extending along a second direction and being arranged along a first direction, the second direction intersecting the first direction; Providing an electrical connecting member, the electrical connecting member being arranged on the first bonding layer and extending along the first direction, the electrical connecting member being arranged to intersect the at least two first bonding strips of strip structure to be electrically connected to the first connecting part through the first bonding layer.

14. The method of claim 13, wherein the method further comprises: Before the step of providing the electrical connecting member, the electrical connecting member being arranged on the first bonding layer and extending along the first direction, the electrical connecting member being arranged to intersect the at least two first bonding strips of strip structure to be electrically connected to the first connecting part through the first bonding layer, the method further comprises: Forming a second bonding layer on the surface of the second connecting part away from the cell body by screen printing, the second bonding layer comprising a second bonding strip of strip structure, the second bonding strip extending along the second direction, the second bonding strip being arranged to intersect the electrical connecting member and to be electrically connected to the second connecting part through the second bonding layer.

15. The method of claim 13, wherein the method further comprises: The step of forming a first bonding layer on the surface of the first connecting part away from the cell body by screen printing, the first bonding layer comprising at least two first bonding strips of strip structure, the at least two first bonding strips extending along a second direction and being arranged along a first direction, the second direction intersecting the first direction, further comprises: Forming a first bonding layer on the surface of the first connecting part away from the cell body by screen printing, the first bonding layer comprising at least two first bonding strips of strip structure and a third bonding strip, the at least two first bonding strips extending along a second direction and being arranged along a first direction, the third bonding strip extending along the first direction, the third bonding strip being located on the central axis of the first connecting part.

16. A screen, characterized by The screen printing plate is provided with a plurality of screen holes, the plurality of screen holes comprising at least two first screen holes arranged along a first direction and a plurality of second screen holes, the at least two first screen holes being arranged adjacently along the first direction, the first screen holes being used to form first bonding strips, the second screen holes being used to form second bonding strips; The distance between two adjacent first screen holes along the first direction is less than the distance between two adjacent second screen holes.

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