Photovoltaic module, preparation method of photovoltaic module and screen printing plate

Abstract

The invention discloses a photovoltaic module, a preparation method of the photovoltaic module and a screen printing plate, and belongs to the technical field of photovoltaics. The photovoltaic module comprises a battery piece body, and the battery piece body is provided with a first surface and a second surface which are oppositely arranged. The connecting parts are arranged on the first surface, the connecting parts comprise first connecting parts and second connecting parts, the first connecting parts and the second connecting parts are arranged at intervals in the first direction, and the area of the first connecting parts is larger than that of the second connecting parts; the first bonding layer is arranged on the surface, away from the battery piece body, of the first connecting part, the first bonding layer comprises at least two first bonding strips of a strip-shaped structure, and the at least two first bonding strips extend in the second direction and are arranged at intervals in the first direction; and the electric connecting piece is arranged on the first joint layer, extends along the first direction, is intersected with the at least two first joint strips of the strip-shaped structure, and is electrically connected to the first connecting part through the first joint layer.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on July 5, 2024, with application number 202421594278.1 and titled “A Photovoltaic Module and Screen”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic module, a method for preparing a photovoltaic module, and a screen. Background Art

[0003] Solar cells are the core components of photovoltaic modules, which can convert solar energy into electrical energy. The surface of the solar cell is provided with a plurality of fine grids extending in a first direction and arranged at intervals in a second direction, and the current generated by the cell is collected by the plurality of fine grids. The surface is also provided with a plurality of welding pads arranged at intervals in the second direction, and the welding strip is connected to the fine grids through the plurality of welding pads to collect the current collected by the fine grids.

[0004] In the prior art, in order to improve the reliability of the connection between the soldering strip and the soldering pad, a tin layer is provided between the soldering pads.

[0005] However, since some pads have a larger area and others have a smaller area, unreliable welding and cold welding are prone to occur during the welding process between the soldering ribbon and the pad, affecting the reliability and photoelectric conversion efficiency of the photovoltaic module. Summary of the invention

[0006] The present application discloses a photovoltaic module, a method for preparing a photovoltaic module and a screen, in order to solve or at least partially solve the problem existing in the prior art that, due to the large area of ​​some welding pads and the small area of ​​other welding pads, there may be unreliable welding, cold welding and the like during the welding process between the welding strip and the welding pad, thereby affecting the reliability and photoelectric conversion efficiency of the photovoltaic module.

[0007] In order to solve the above technical problems, this application is implemented as follows:

[0008] In a first aspect, the present application discloses a photovoltaic module, which includes a battery cell body, wherein the battery cell body has a first surface and a second surface arranged opposite to each other; a connecting portion, which is arranged on the first surface, and includes a first connecting portion and a second connecting portion, wherein the first connecting portion and the first connecting portion are arranged at intervals along a first direction, and the area of ​​the first connecting portion is larger than the area of ​​the second connecting portion; a first bonding layer, which is arranged on a surface of the first connecting portion away from the battery cell body, and the first bonding layer includes at least two first bonding strips of strip-like structures, wherein at least two of the first bonding strips extend along a second direction and are arranged at intervals along the first direction, and the second direction intersects with the first direction; an electrical connector, which is arranged on the first bonding layer, extends along the first direction, and is arranged to intersect with the at least two first bonding strips of the strip-like structures, and is electrically connected to the first connecting portion through the first bonding layer.

[0009] In the embodiment of the present application, a first bonding layer is provided on the surface of the first connection part away from the battery cell body, the first bonding layer includes at least two first bonding strips, at least two first bonding strips are arranged at intervals along the first direction, and the first bonding strip is in a strip-shaped structure extending along the second direction, and an electrical connector is provided on the first bonding layer, the electrical connector extends along the first direction, and is arranged to intersect with the first bonding strips of the at least two strip-shaped structures, so that the electrical connector is connected to the first connection part through the first bonding layer. Through the above arrangement, the height of the first bonding strip can be reduced, so that the height of the first bonding strip is relatively low, and the first bonding strip will not support the electrical connector, thereby reducing the risk of the electrical connector being offset, improving the reliability of the connection between the electrical connector and the first connection part, and ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module. Furthermore, through the above arrangement, the reliability of the connection between the second connection part adjacent to the first connection part and the electrical connector can also be improved, thereby further improving the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module. Furthermore, the electrical connector extends along a first direction and intersects or is perpendicularly arranged with each first connecting strip of at least two strip structures. The electrical connector is connected to the first connecting portion through a first connecting layer, which can increase the contact area between the electrical connector and the first connecting portion, thereby improving the reliability of the connection between the electrical connector and the first connecting portion.

[0010] Optionally, along the first direction, the first connection portion is located close to an edge of the battery cell body; compared with the first connection portion, the second connection portion is located relatively far away from the edge of the battery cell body.

[0011] The first connection portion in the embodiment of the present application is located near the edge of the battery cell body, and compared with the first connection portion, the second connection portion is located relatively far away from the edge of the battery cell body. The electrical connector is connected to the edge area of ​​the battery cell body through the first connection portion, thereby improving the reliability of the connection between the electrical connector and the edge area of ​​the battery cell body, avoiding the deviation of the electrical connector and causing poor photovoltaic components. Furthermore, the first connection portion has a larger area, which can also widen the process window for printing the first bonding layer and improve the fault tolerance of the first bonding layer printing the first connection portion. In addition, the first connection portion is a marking point in the printing process of the first bonding layer, and its size is larger, which can provide a regular and square marking point for the capture camera, thereby further improving the printing yield of the first bonding layer.

[0012] Optionally, along the second direction, the width of the first connecting portion is equal to the width of the second connecting portion; along the first direction, the length of the first connecting portion is greater than the length of the second connecting portion.

[0013] The above arrangement makes the area of ​​the first connection part larger than the area of ​​the second connection part. The electrical connector is connected to the edge area of ​​the battery cell body through the first connection part, thereby improving the reliability of the connection between the electrical connector and the edge area of ​​the battery cell body, avoiding the deviation of the electrical connector and causing poor photovoltaic modules. Furthermore, the larger area of ​​the first connection part can also broaden the process window for printing the first bonding layer and improve the fault tolerance of the first bonding layer printing the first connection part. In addition, the first connection part is a marking point in the printing process of the first bonding layer, and its size is larger, which can provide a regular and square marking point for the capture camera, thereby improving the printing yield of the first bonding layer.

[0014] Optionally, the photovoltaic module further includes a second bonding layer, wherein the second bonding layer is disposed on the surface of the second connection portion away from the battery cell body, the second bonding layer includes a second bonding strip with a strip-shaped structure, the second bonding strip extends along the second direction, the second bonding strip is intersected with the electrical connector, and the electrical connector is electrically connected to the second connection portion 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 electrical connector will not be supported by the first bonding strip or the second bonding strip, thereby helping to improve the reliability of the connection between the electrical connector and the first connection portion and the second connection portion, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0015] Optionally, the second joining strip has the same size as the first joining strip. Through the above arrangement, the height of the second joining strip is closer to that of the first joining strip, and the electrical connector will not be supported by the first joining strip or the second joining strip, thereby helping to further improve the reliability of the connection between the electrical connector and the first connecting part and the second connecting part, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0016] Optionally, at least two of the first bonding strips are spaced apart from each other on the first connection portion; or, at least two of the first bonding strips have their bottoms connected to each other on the first connection portion. Through the above arrangement, the first bonding layer can more reliably connect the electrical connector to the first connection portion, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0017] Optionally, the first joining strip extends along the second direction and has a rectangular structure; and / or the first joining strip extends along the second direction and has a runway-shaped structure.

[0018] In an embodiment of the present application, the first joining strip is arranged as a rectangular structure extending along the second direction, and / or the first joining strip is arranged as a runway-type structure extending along the second direction, so as to improve the height consistency of the first joining strip, improve the uniformity of printing the first joining strip, and avoid the first joining strip supporting the electrical connector, thereby further reducing the probability of the electrical connector being offset and improving the welding yield of the photovoltaic module.

[0019] Furthermore, during the processing of photovoltaic modules, it is necessary to use screen printing to print metal paste on the surface of the first connection portion away from the battery cell body to form the first bonding strip. During the screen printing process, if the first bonding strip is a rectangular structure, the metal paste is likely to remain at the corners of the screen, resulting in poor printing. The rounded corners of the rectangular structure or the runway structure can improve the demoulding property of the first bonding strip and make the height of the first bonding strip more uniform.

[0020] Furthermore, during the printing process, the first connecting portion of the first connecting strip of the quasi-rectangular structure or the racetrack structure is not easily printed out, thereby avoiding the risk of short circuit of the photovoltaic module and improving the yield of the photovoltaic module.

[0021] Optionally, the first joining strip is a polygonal structure, wherein the number of sides of the polygonal structure is 4N, satisfying N≥2. During the process of welding the electrical connector to the first connecting portion, the first joining strip will be temporarily melted and pressed by the ejector pin, and there is a risk of pressing the first joining strip and the electrical connector out of the first connecting portion. Compared with the first joining strip of a quadrilateral structure such as a rectangular structure or a square structure, the first joining strip of a polygonal structure has a corner position farther from the edge position of the first connecting portion, which can improve the tolerance rate of the first joining strip deviating from the first connecting portion, thereby reducing the probability of short circuit risk in the photovoltaic module and improving the yield rate of the photovoltaic module.

[0022] Optionally, the first bonding layer further includes 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 portion, and the electrical connector covers the third bonding strip. The electrical connector extends along the first direction, the third bonding strip is located between the electrical connector and the first connecting portion, and the electrical connector covers the third bonding strip. The third bonding strip can further improve the connection reliability between the electrical connector and the first connecting portion, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0023] Optionally, the first bonding layer is in at least one of an I-shaped structure, a Gan-shaped structure, a Shi-shaped structure, and a Wang-shaped structure. In the embodiment of the present application, by setting the first bonding layer in at least one of an I-shaped structure, a Gan-shaped structure, a Shi-shaped structure, and a Wang-shaped structure, the connection reliability between the electrical connector and the first connecting portion is further improved, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0024] Optionally, along the first direction, the width of the first bonding strip is smaller than the width of the second connection part; and / or, along the second direction, the length of the first bonding strip is smaller than the length of the second connection part. Through the above arrangement, the area of ​​the first bonding strip can be controlled so that at least two first bonding strips can be arranged in the first connection part to reduce the height of the first bonding layer, avoid the first bonding layer supporting the electrical connector, reduce the risk of electrical connector deviation, and thus improve the yield of the photovoltaic module.

[0025] Optionally, the first surface is the backlight surface of the cell body. That is, the photovoltaic module in the embodiment of the present application is a back-contact photovoltaic module, which has the advantage of high photoelectric conversion efficiency.

[0026] In a second aspect, the present application discloses a method for preparing a photovoltaic module, the method comprising: providing a battery cell body, the battery cell body having a first surface and a second surface arranged opposite to each other; forming a connecting portion on the first surface of the battery 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 at intervals along a first direction, and the area of ​​the first connecting portion being larger than the area of ​​the second connecting portion; forming a first bonding layer on a surface of the first connecting portion away from the battery cell body by screen printing, during printing, a scraper moves along a second direction, the first bonding layer comprising at least two first bonding strips of a strip structure, at least two of the first bonding strips extending along the second direction and arranged at intervals along the first direction, the second direction intersecting with the first direction; providing an electrical connector, arranging the electrical connector on the first bonding layer, and the electrical connector extending along the first direction, the electrical connector intersecting with the at least two first bonding strips of the strip structure, so as to be electrically connected to the first connecting portion through the first bonding layer.

[0027] Optionally, an electrical connector is provided, the electrical connector is arranged on the first bonding layer, and the electrical connector extends along the first direction, the electrical connector is arranged to intersect with the first bonding layer of at least two strip structures, so as to be electrically connected to the first connecting part through the first bonding layer, and the method also includes: forming a second bonding layer on the surface of the second connecting part away from the battery cell body by screen printing, during printing, the scraper moves along the second direction, the second bonding layer includes a second bonding strip with a strip structure, the second bonding strip extends along the second direction, the second bonding strip is arranged to intersect with the electrical connector, and the electrical connector is electrically connected to the second connecting part through the second bonding layer.

[0028] Optionally, the method further comprises: forming a first bonding layer on a surface of the first connecting portion away from the battery cell body by screen printing, and during printing, the scraper moves along the second direction, and the first bonding layer includes at least two first bonding strips with strip structures, and at least two of the first bonding strips extend along the second direction and are arranged at intervals along the first direction. The first bonding layer also comprises: forming a first bonding layer on a surface of the first connecting portion away from the battery cell body by screen printing, and during printing, the scraper moves along the second direction, and the first bonding layer includes at least two first bonding strips and a third bonding strip with strip structures, and at least two of the first bonding strips extend along the second direction and are arranged at intervals along the first direction, and the third bonding strip extends along the first direction and is located on the central axis of the first connecting portion.

[0029] In a third aspect, the present application discloses a screen having a plurality of mesh holes thereon, the plurality of mesh holes comprising at least two first mesh holes and a plurality of second mesh holes spaced apart along a first direction, the first mesh holes being used to form a first joining strip, the second mesh holes being used to form a second joining strip; the distance between two adjacent first mesh holes being smaller than the distance between two adjacent second mesh holes.

[0030] The present application discloses a photovoltaic module, a preparation method of a photovoltaic module and a screen, wherein the photovoltaic module includes a battery cell body, the battery cell body having a first surface and a second surface arranged opposite to each other; a connecting portion, the connecting portion is arranged on the first surface, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting portion and the first connecting portion are arranged at intervals along a first direction, and the area of ​​the first connecting portion is larger than the area of ​​the second connecting portion; a first bonding layer, the first bonding layer is arranged on a surface of the first connecting portion away from the battery cell body, the first bonding layer includes at least two first bonding strips of strip-like structures, at least two of the first bonding strips extend along a second direction and are arranged at intervals along the first direction, and the second direction intersects with the first direction; an electrical connector, the electrical connector is arranged on the first bonding layer, the electrical connector extends along the first direction and is arranged to intersect with the at least two first bonding strips of the strip-like structures, and the electrical connector is electrically connected to the first connecting portion through the first bonding layer.

[0031] In the present application, a first bonding layer is provided on the surface of the first connection part away from the battery cell body, the first bonding layer includes at least two first bonding strips of strip-shaped structures, at least two first bonding strips extend along the second direction and are arranged at intervals along the first direction, and an electrical connector is provided on the first bonding layer, the electrical connector extends along the first direction and is arranged to intersect with at least two first bonding strips of strip-shaped structures, so as to connect the electrical connector to the first connection part through the first bonding layer. Through the above arrangement, the height of the first bonding strip is relatively low, and the first bonding strip will not support the electrical connector, thereby reducing the probability of the electrical connector being offset, improving the reliability of the connection between the electrical connector and the first connection part, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0032] Furthermore, through the above arrangement, the reliability of the connection between the second connection part adjacent to the first connection part and the electrical connection member can be improved, thereby helping to improve the yield of the photovoltaic module and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0033] Furthermore, the electrical connector extends along the first direction and intersects with the first connecting strips of at least two strip structures. The electrical connector is connected to the first connecting portion through the first connecting layer, which can increase the contact area between the electrical connector and the first connecting layer, thereby improving the reliability of the connection between the electrical connector and the first connecting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram showing the structure of the photovoltaic assembly described in the embodiment of the present application;

[0035] Figure 2 Schematic diagram of the local structure of the photovoltaic module described in the embodiment of the present application Figure 1 ;

[0036] Figure 3 Schematic diagram of the local structure of the photovoltaic module described in the embodiment of the present application Figure 2 ;

[0037] Figure 4 A schematic diagram showing the structure of the pad described in the embodiment of the present application;

[0038] Figure 5 The structure diagram of the screen described in the embodiment of the present application is shown in FIG. Figure 1 ;

[0039] Figure 6 The structure diagram of the screen described in the embodiment of the present application is shown in FIG. Figure 2 ;

[0040] Figure 7 The structure diagram of the screen described in the embodiment of the present application is shown in FIG. Figure 3 ;

[0041] Figure 8 A schematic diagram showing the structure of the first mesh in the screen described in the embodiment of the present application;

[0042] Fig. 9 Another schematic diagram showing the structure of the first mesh in the screen described in the embodiment of the present application;

[0043] Fig.10 The preparation process of the photovoltaic module described in the embodiment of the present application is shown in FIG. Figure 1 ;

[0044] Fig.11 The preparation process of the photovoltaic module described in the embodiment of the present application is shown in FIG. Figure 2 .

[0045] Reference numerals:

[0046] 10: Battery body;

[0047] 20: connection part; 21: first connection part; 22: second connection part;

[0048] 30: first bonding layer; 31: first bonding strip; 32: third bonding strip;

[0049] 40: second joining strip;

[0050] 50: first fine grid; 51: second fine grid;

[0051] 60: screen; 61: first mesh; 62: second mesh;

[0052] 70: electrical connector;

[0053] A: first direction; B: second direction. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the fixed scope of the present application.

[0055] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0056] Reference Figure 1 , showing a schematic diagram of the structure of the photovoltaic assembly described in the embodiment of the present application; referring to Figure 2 , showing a schematic diagram of the local structure of the photovoltaic module described in the embodiment of the present application Figure 1 ;reference Figure 3 , showing a schematic diagram of the local structure of the photovoltaic module described in the embodiment of the present application Figure 2 ;reference Figure 4 , shows a schematic diagram of the structure of the pad described in the embodiment of the present application.

[0057] like Figures 1 to 4As shown, an embodiment of the present application discloses a photovoltaic module, which includes a battery cell body 10, and the battery cell body 10 has a first surface and a second surface arranged opposite to each other; 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 first connecting portion 22 are arranged at intervals along a first direction A, and 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 battery cell body 10, the first bonding layer 30 includes at least two first bonding strips 31 of strip structure, at least two first bonding strips 31 extend along a second direction B and are arranged at intervals along the first direction A, and the second direction B intersects with the first direction A; an electrical connector, the electrical connector 70 is arranged on the first bonding layer 30, the electrical connector 70 extends along the first direction A, and is arranged to intersect with the at least two first bonding strips 31 of strip structure, and the electrical connector 70 is electrically connected to the first connecting portion 21 through the first bonding layer 30.

[0058] The photovoltaic module disclosed in the embodiment of the present application includes a cell body 10, which is a core component of the photovoltaic module and can convert solar energy into electrical energy. The cell body 10 has a first surface and a second surface arranged opposite to each other. When the first surface is a light-receiving surface facing the sunlight, the second surface is a backlight surface facing away from the sunlight. When the first surface is a backlight surface facing away from the sunlight, the second surface is a light-receiving surface facing the sunlight.

[0059] The following description will be made by taking the first surface of the cell body 10 as the backlight surface facing away from the sunlight and the second surface of the cell body 10 as the light-receiving surface facing the sunlight as an example. That is, the solar cell disclosed in the embodiment of the present application is a back-contact solar cell.

[0060] like Figures 1 to 4 As shown, the photovoltaic module disclosed in the embodiment of the present application further includes a connection portion 20, which is disposed on the first surface of the battery cell body 10. The connection portion 20 includes a first connection portion 21 and a second connection portion 22, which are arranged at intervals along the first direction A on the first surface of the battery cell body 10, and the area of ​​the first connection portion 21 is greater than the area of ​​the second connection portion 22.

[0061] For example, the first connection portion 21 and the second connection portion 22 are both rectangular structures. Along the second direction B, the length of the first connection portion 21 is equal to the length of the second connection portion 22. Along the first direction A, the width of the first connection portion 21 is greater than the width of the second connection portion 22.

[0062] For another example, the first connection portion 21 and the second connection portion 22 are both rectangular structures, and along the second direction B, the length of the first connection portion 21 is equal to the length of the second connection portion, and along the first direction A, the width of the first connection portion is greater than the width of the second connection portion 22. The rectangular structure refers to a rectangular structure with chamfers, and the chamfers can be round or square.

[0063] Of course, the above are only individual examples of the specific structures of the first connection part 21 and the second connection part 22, and are not intended to be limiting of the present application. In actual applications, technicians can also set the specific structures of the first connection part 21 and the second connection part 22 as needed.

[0064] like Figures 1 to 4 As shown, a first bonding layer 30 is disposed on the surface of the first connection portion 21 away from the battery cell body 10, so as to improve the reliability of the connection between the electrical connection member and the first connection portion 21 through the first bonding layer 30. Specifically, the first bonding layer 30 includes at least two first bonding strips 31 of a 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.

[0065] Exemplarily, the first joining strips 31 in the embodiment of the present application may include two, three, four, or five. In the embodiment of the present application, there are no excessive restrictions on the specific number of the first joining strips 31. In actual applications, technicians can set the specific number of the first joining strips 31 as needed.

[0066] The second direction B in the embodiment of the present application intersects with the first direction A. Preferably, the second direction B intersects with the first direction A. For example, when the battery cell body 10 is a rectangular structure, the first direction A in the embodiment of the present application may be the width direction of the battery cell body 10 or the length direction of the battery cell body 10. If the first direction A is the width direction of the battery cell body 10, the second direction B may be the length direction of the battery cell body 10. If the first direction A is the length direction of the battery cell body 10, the second direction B may be the width direction of the battery cell body 10.

[0067] It should be noted that the first bonding layer 30 in the embodiment of the present application may be a tin layer or other conductive metal layer. In the embodiment of the present application, there are no excessive restrictions on the specific material of the first bonding layer 30. In practical applications, technicians can set the specific material of the first bonding layer 30 as needed. The following will take the first bonding layer 30 as a tin layer as an example to explain the present application.

[0068] During the processing of the photovoltaic module, a conductive connection material, such as tin paste, can be applied to the surface of the first connection part 21 away from the battery cell body 10 by screen printing, so as to form a first bonding layer 30, that is, a tin layer, on the surface of the first connection part 21 away from the battery cell body 10, and the reliability of the connection between the electrical connector and the first connection part 21 is improved by the tin layer. During the screen printing process, the scraper moves along the second direction B, and the movement direction of the scraper is the same as the extension direction of the first bonding strip 31.

[0069] The photovoltaic component disclosed in the embodiment of the present application also includes an electrical connector 70, wherein the electrical connector 70 is arranged on the first bonding layer 30, the electrical connector 70 extends along the first direction A, and the electrical connector 70 is arranged to intersect with the first bonding strips 31 of at least two strip structures to connect the electrical connector 70 to the first connecting portion 21 through the first bonding layer 30.

[0070] The electrical connector 70 in the embodiment of the present application extends along the first direction A, is disposed on the side of the first bonding layer 30 away from the first connection portion 21, and is disposed to intersect with at least two first bonding strips 31 of strip-shaped structures, so as to connect the electrical connector 70 to the first connection portion 21 through the first bonding layer 30. In other words, the electrical connector 70 extends along the first direction A, while the first bonding strip 31 is in a strip-shaped structure, and the length direction of the first bonding strip 31 extends along the second direction B, so that the extension direction of the electrical connector 70 intersects with the extension direction of the first bonding strip 31, thereby increasing the contact area between the electrical connector 70 and the first bonding strip 31, and making the connection between the electrical connector 70 and the first connection portion 30 more reliable.

[0071] It should be noted that the electrical connector 70 in the embodiment of the present application may only include a metal strip body, or may include a metal strip body and a metal layer coated on the surface of the metal strip body. In the embodiment of the present application, there are no excessive restrictions on the specific structure of the electrical connector 70. In actual applications, technicians can set it as needed.

[0072] In the embodiment of the present application, a first bonding layer 30 is provided on the surface of the first connection part 21 away from the battery cell body 10, the first bonding layer 30 includes at least two first bonding strips 31, at least two first bonding strips 31 are arranged at intervals along the first direction A, and the first bonding strips 31 are in a strip-shaped structure extending along the second direction B, and an electrical connector 70 is provided on the first bonding layer 30, the electrical connector 70 extends along the first direction A, and is arranged to intersect with the at least two first bonding strips 31 in a strip-shaped structure, so that the electrical connector 70 is connected to the first connection part 21 through the first bonding layer 30. Through the above-mentioned arrangement, the height of the first bonding strip 31 can be reduced, so that the height of the first bonding strip 31 is relatively low, and the first bonding strip 31 will not support the electrical connector 70, thereby reducing the risk of the electrical connector 70 being offset, improving the reliability of the connection between the electrical connector 70 and the first connection part 21, and ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0073] Furthermore, through the above arrangement, the reliability of the connection between the second connection part 22 adjacent to the first connection part 21 and the electrical connector 70 can be improved, thereby further improving the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0074] In addition, the electrical connector 70 extends along the first direction A and is arranged to intersect with the first connecting strips 31 of at least two strip structures. The electrical connector 70 is connected to the first connecting portion 21 through the first connecting layer 30, which can increase the contact area between the electrical connector 70 and the first connecting layer 30, thereby improving the reliability of the connection between the electrical connector 70 and the first connecting portion 21.

[0075] Alternatively, if Figures 1 to 4 As shown, along the first direction A, the first connection portion 21 is located close to the edge of the battery cell body 10 ; compared with the first connection portion 21 , the second connection portion 22 is located relatively far away from the edge of the battery cell body 10 .

[0076] like Figures 1 to 4 As shown, along the first direction A, the battery cell body 10 has a first side and a second side that are oppositely arranged, wherein the first connection portion 21 is located in a region of the battery cell body 10 close to the first side or the second side. Compared with the first connection portion 21, the second connection portion 22 is located in a region relatively far from the first side and the second side of the battery cell body 10.

[0077] It should be noted that the first connection portion 21 and the second connection portion 22 in the embodiment of the present application are generally rectangular structures, and the area of ​​the first connection portion 21 is larger than the area of ​​the second connection portion 22. The first connection portion 21 is located near the edge of the cell body 10, and compared with the first connection portion 21, the second connection portion 22 is located relatively far away from the edge of the cell body 10. The electrical connector 70 is connected to the edge area of ​​the cell body 10 through the first connection portion 21, thereby improving the reliability of the connection between the electrical connector 70 and the edge area of ​​the cell body 10, and avoiding the deviation of the electrical connector 70, which leads to defective photovoltaic modules.

[0078] Furthermore, the first connection portion 21 has a larger area, which can also broaden the process window for printing the first bonding layer 30 and improve the error tolerance of printing the first connection portion 21 on the first bonding layer 30 .

[0079] Furthermore, the first connection portion 21 serves as a marking point during the printing process of the first bonding layer 30 , and its size is relatively large, so that a regular and square marking point can be provided for the capture camera, thereby further improving the printing yield of the first bonding layer 30 .

[0080] Alternatively, if Figures 1 to 4 As shown, along the second direction B, the width of the first connection portion 21 is equal to the width of the second connection portion 22 ; along the first direction A, the length of the first connection portion 21 is greater than the length of the second connection portion 22 .

[0081] like Figures 1 to 4 As shown, the first connection part 21 and the second connection part 22 in the embodiment of the present application are both rectangular structures, and the first connection part 21 and the second connection 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 connection part 21 is equal to the width of the second connection part 22. And along the first direction A, the length of the first connection part 21 is greater than the length of the second connection part 22. As a result, the area of ​​the first connection part 21 is greater than the area of ​​the second connection part 22. The electrical connector 70 is connected to the edge area of ​​the battery cell body 10 through the first connection part 21, thereby improving the reliability of the connection between the electrical connector 70 and the edge area of ​​the battery cell body 10, and avoiding the deviation of the electrical connector 70, which leads to poor photovoltaic components.

[0082] Furthermore, the first connection portion 21 has a larger area, which can also broaden the process window for printing the first bonding layer 30 and improve the error tolerance of printing the first connection portion 21 of the first bonding layer 30. In addition, the first connection portion 21 is a marking point in the printing process of the first bonding layer 30, and its size is larger, which can provide a regular and square marking point for the capture camera, thereby improving the printing yield of the first bonding layer 30.

[0083] Alternatively, if Figures 1 to 4As shown, the photovoltaic component in the embodiment of the present application also includes a second bonding layer, wherein the second bonding layer is arranged on the surface of the second connecting part 22 away from the battery cell body 10, and the second bonding layer includes a second bonding strip 40 with a strip structure, and the second bonding strip 40 extends along the second direction B. The second bonding strip 40 is arranged to intersect with the electrical connector 70, and the electrical connector 70 is electrically connected to the second connecting part 22 through the second bonding layer.

[0084] like Figures 1 to 4 As shown, in the embodiment of the present application, a second bonding layer is provided on the surface of the second connection part 22 away from the battery cell body 10, and the electrical connector 70 is connected to the second connection part 22 through the second bonding layer to improve the reliability of the connection between the electrical connector 70 and the second connection part 22.

[0085] The second bonding layer includes a second bonding strip 40 of 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 connector 70 will not be supported by the first bonding strip 31 or the second bonding strip 40, thereby helping to improve the reliability of the connection between the electrical connector 70 and the first connection part 21 and the second connection part 22, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0086] Alternatively, if Figures 1 to 4 As shown, the second joining strip 40 and the first joining strip 31 in the embodiment of the present application have the same size.

[0087] like Figures 1 to 4 As shown, the second joining strip 40 and the first joining strip 31 in the embodiment of the present application have the same size. Exemplarily, when the first joining strip 31 is a rectangular structure, the second joining strip 40 is also a rectangular structure, and the length and width of the first joining strip 31 are respectively equal to the length and width of the second joining strip 40. Through the above arrangement, the height of the second joining strip 40 is closer to the height of the first joining strip 31, and the electrical connector 70 will not be propped up by the first joining strip 31 or the second joining strip 40, thereby helping to further improve the reliability of the connection between the electrical connector 70 and the first connecting portion 21 and the second connecting portion 22, and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0088] It should be noted that the quasi-rectangular structure in the embodiment of the present application refers to a rectangular structure with chamfers at the four corners, and the chamfers may be square chamfers or circular chamfers.

[0089] Optionally, at least two first joining strips 31 are spaced apart from each other on the first connecting portion 21 ; or, bottoms of at least two first joining strips 31 are connected to each other on the first connecting portion 21 .

[0090] The first bonding layer 30 in the embodiment of the present application may include at least two first bonding strips 31 spaced apart along the first direction A, and the at least two first bonding strips 31 are spaced apart from each other on the first connecting portion 21. That is, the at least two first bonding strips 31 are respectively connected to the electrical connector 70, and no other connection structure is provided between the at least two first bonding strips 31.

[0091] Alternatively, the first bonding layer 30 may also include at least two first bonding strips 31 spaced apart 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 connection portion 21. For example, a bonding strip extending along the first direction A may be provided to connect the at least two first bonding strips 31 together, and then the bonding strip and the at least two first bonding strips 31 are connected to the electrical connector 70 to further improve the reliability of the connection between the first connection portion 21 and the electrical connector 70, and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0092] Alternatively, if Figures 1 to 4 As shown, the first joining strip 31 in the embodiment of the present application extends along the second direction B and has a rectangular structure; and / or, the first joining strip 31 extends along the second direction B and has a runway-shaped structure.

[0093] like Figures 1 to 4 As shown, in the embodiment of the present application, the first joining strip 31 can be arranged in a quasi-rectangular structure extending along the second direction B. The quasi-rectangular structure can be a quasi-rectangular structure formed by setting circular chamfers at the four corners of the rectangular structure. It can be a quasi-rectangular structure formed by setting square chamfers at the four corners of the rectangular structure. It can also be a quasi-rectangular structure formed by setting chamfers of other shapes at the four corners of the rectangular structure. In the embodiment of the present application, there are no excessive restrictions on the specific chamfer types set at the four corners of the rectangular structure. In actual applications, technicians can set them as needed.

[0094] In the embodiment of the present application, the first joining strip 31 may also be provided as a runway-shaped structure extending along the second direction B. It can be understood that the runway-shaped structure includes a rectangular structure extending along the second direction B and arc-shaped structures respectively connected to both ends of the rectangular structure.

[0095] In the embodiment of the present application, the first joining strip 31 is arranged to be a rectangular structure extending along the second direction B, and / or the first joining strip 31 is arranged to be a runway-type structure extending along the second direction B, so as to improve the high consistency of the first joining strip 31, improve the uniformity of printing the first joining strip 31, and avoid the first joining strip 31 supporting the electrical connector, thereby further reducing the probability of the electrical connector being offset and improving the welding yield of the photovoltaic module.

[0096] Furthermore, during the processing of the photovoltaic module, it is necessary to use screen printing to print the metal paste on the surface of the first connection portion 21 away from the battery cell body 10 to form the first bonding strip 31. During the screen printing process, if the first bonding strip 31 is a rectangular structure, the metal paste is likely to remain at the corners of the screen, resulting in poor printing. The rounded corners of the rectangular structure or the runway structure can improve the demoulding property of the first bonding strip 31 and make the height of the first bonding strip 31 more uniform.

[0097] Furthermore, the first connecting strip 31 of the quasi-rectangular structure or the racetrack structure is not easy to print out the first connecting portion 21 during the printing process, thereby avoiding the risk of short circuit of the photovoltaic module and improving the yield of the photovoltaic module.

[0098] Alternatively, if Figures 1 to 4 As shown, the first bonding strip 31 in the embodiment of the present application is a polygonal structure, wherein the number of sides of the polygonal structure is 4N, satisfying N≥2.

[0099] like Figures 1 to 4 As shown, in the embodiment of the present application, the first joining strip 31 is arranged in a polygonal structure, and the number of sides of the polygonal structure is 4N, where N≥2. In the process of welding the electrical connector to the first connecting portion 21, the first joining strip 31 will be temporarily melted and pressed by the ejector pin, and there is a risk of pressing the first joining strip 31 and the electrical connector to deviate from the first connecting portion 21. The first joining strip 31 with a polygonal structure is farther from the edge of the first connecting portion 21 than the first joining strip 31 with a quadrilateral structure such as a rectangular structure or a square structure, which can improve the fault tolerance of the first joining strip 31 deviating from the first connecting portion 21, thereby reducing the probability of short circuit risk of the photovoltaic module and improving the yield of the photovoltaic module.

[0100] For example, when N=2, the first joining strip 31 has an octagonal structure. When N=3, the first joining strip 31 has a dodecagonal structure. When N=4, the first joining strip 31 has a hexadecagonal structure. Of course, the above are only individual examples of the specific structure of the first joining strip 31 in the embodiment of the present application, and are not intended to be limiting of the present application. In actual applications, technicians can also set the specific value of N according to actual needs to determine the specific structure of the first joining strip 31.

[0101] Alternatively, if Figure 3 As shown, the first bonding layer 30 in the embodiment of the present application also includes 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 portion 21 , and the electrical connector 70 covers the third bonding strip 32 .

[0102] In the embodiment of the present application, the first bonding layer 30 may further include a third bonding strip 32. The third bonding strip 32 has a long strip-shaped structure extending along the first direction A, and the third bonding strip 32 is located on the central axis of the first connecting portion 21. The electrical connector 70 extends along the first direction A, and the electrical connector 70 covers the third bonding strip 32. That is to say, the third bonding strip 32 is located between the electrical connector 70 and the first connecting portion 21. The setting of the third bonding strip 32 can further improve the connection reliability between the electrical connector 70 and the first connecting portion 21, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0103] Optionally, the first bonding layer 30 has at least one of an I-shaped structure, a dry-shaped structure, a cross-shaped structure, and a king-shaped structure.

[0104] Exemplarily, when the first bonding layer 30 includes two first bonding strips 31, both of the two first bonding strips 31 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 that the first bonding layer 30 having a cross-shaped structure, or a dry-shaped structure, or an I-shaped structure can be formed. When the first bonding layer 30 includes three first bonding strips 31, all of the three first bonding strips 31 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 the first bonding layer 30 having a king-shaped structure.

[0105] In the embodiment of the present application, by setting the first bonding layer 30 to have at least one of an I-shaped structure, a dry-shaped structure, a cross-shaped structure, and a king-shaped structure, the connection reliability between the electrical connector 70 and the first connecting portion 21 is further improved, and the photoelectric conversion efficiency of the photovoltaic module is ensured.

[0106] It should be noted that at least a part of the third bonding strip 32 in the embodiment of the present application is disposed between the electrical connector 70 and the first connecting portion 21. That is to say, at least a part of the third bonding strip 32 is located below the electrical connector 70 to improve the connection reliability between the first connecting portion 21 and the electrical connector 70 through the third bonding strip 32.

[0107] Optionally, as Figures 1 to 4 shown, along the first direction A, the width of the first bonding strip 31 is smaller than the width of the second connecting portion 22; and / or, along the second direction B, the length of the first bonding strip 31 is smaller than the length of the second connecting portion 22.

[0108] As Figures 1 to 4As shown, in the embodiment of the present application, along the first direction A, the width of the first bonding strip 31 is set to be smaller than the width of the second connection portion 22, and / or, along the second direction B, the length of the first bonding strip 31 is set to be smaller than the length of the second connection portion 22. Through the above settings, the area of ​​the first bonding strip 31 can be controlled, so that at least two first bonding strips 31 can be arranged in the first connection portion 21, so as to reduce the height of the first bonding layer 30, avoid the first bonding layer 30 supporting the electrical connector 70, reduce the risk of the electrical connector 70 being offset, and thus improve the yield of the photovoltaic module.

[0109] Optionally, the first surface in the embodiment of the present application is the backlight surface of the cell body 10. That is, the photovoltaic module in the embodiment of the present application is a back-contact photovoltaic module, which has the advantage of high photoelectric conversion efficiency.

[0110] Optionally, a plurality of first fine grids 50 and a plurality of second fine grids 51 are provided on the first surface of the battery cell body 10, and the plurality of first fine grids 50 and the plurality of second fine grids 51 all 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 adjacent first connecting portions 21 and second connecting portions 22.

[0111] like Figures 1 to 4 As shown, 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 battery cell body 10, and 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 battery cell body 10 is collected by the plurality of first fine grids 50 and the plurality of second fine grids 51.

[0112] The first fine grid 50 is connected to the connection portion 20, and the current collected by the first fine grid 50 is collected through the connection portion 20. That is, the first connection portion 21 is connected to at least one first fine grid 50, and the second connection 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 connection portion 21 and the second connection portion 22, and transmit the collected current to the electrical connection member, and transmit the current to the external circuit through the electrical connection member.

[0113] like Figures 1 to 4 As shown, at least one second fine grid 51 is located between adjacent first connecting portions 21 and second connecting portions 22 to prevent the second fine grid 51 from being connected to the first connecting portion 21 or the second connecting portion 22, thereby preventing the photovoltaic module from being short-circuited.

[0114] Optionally, the electrical connector in the embodiment of the present application is in direct contact with at least two first joining strips 31 .

[0115] The electrical connector in the embodiment of the present application is in direct contact with at least two first connection strips 31 , so that the electrical connector is connected to the first connection portion 21 through at least two first connection strips 31 , thereby improving the reliability of the connection between the electrical connector and the first connection portion 21 .

[0116] Reference Figure 5 , showing the structure of the screen described in the embodiment of the present application Figure 1 ;reference Figure 6 , showing the structure of the screen described in the embodiment of the present application Figure 2 ;reference Figure 7 , showing the structure of the screen described in the embodiment of the present application Figure 3 ;reference Figure 8 , showing a schematic diagram of the structure of the first mesh in the screen described in the embodiment of the present application; Fig. 9 , shows another structural schematic diagram of the first mesh in the screen described in the embodiment of the present application.

[0117] like Figures 5 to 9 As shown, the embodiment of the present application further discloses a screen 60, on which a plurality of mesh holes are arranged, the plurality of mesh holes including 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 are used to form a first joining strip 31, the second mesh holes are used to form a second joining strip 40, and the distance between two adjacent first mesh holes 61 is smaller than the distance between two adjacent second mesh holes 62.

[0118] The embodiment of the present application also discloses a screen 60. The screen 60 disclosed in the embodiment of the present application is used to print metal paste on the surface of the first connection part 21 away from the battery cell body 10 and the surface of the second connection part 22 away from the battery cell body 10, so as to form at least two first bonding strips 31 on the surface of the first connection part 21 away from the battery cell body 10, and form a second bonding strip 40 on the surface of the second connection part 22 away from the battery cell body 10. The metal paste is not easy to remain at the corners of the screen 60, and the printing yield of the photovoltaic module is high.

[0119] Furthermore, the screen 60 disclosed in the embodiment of the present application is used to print the metal paste on the surface of the first connection part 21 away from the battery cell body 10, so as to form at least two first bonding strips 31 on the surface of the first connection part 21 away from the battery cell body 10. The metal paste is printed on the surface of the second connection part 22 away from the battery cell body 10, so as to form a second bonding strip 40 on the surface of the second connection part 22 away from the battery cell body 10, so that the demoulding property of the first bonding strip 31 and the second bonding strip 40 is better, the height of the first bonding strip 31 and the second bonding strip 40 is more consistent, and the first bonding strip 31 will not support the electrical connector, thereby reducing the risk of the electrical connector being offset, improving the reliability of the connection between the electrical connector and the first connection part 21 and the second connection part 22, and improving the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0120] Furthermore, during the printing process, the first joining strip 31 is not easy to be printed out of the first connecting portion 21 .

[0121] It should be noted that, in the embodiment of the present application, the distance between two adjacent first meshes 61 is smaller than the distance between two adjacent second meshes 62. Thus, the first joining strip 31 formed by printing the first meshes 61 can be located on the first connecting portion 21, and the second joining strip 40 formed by printing the second meshes 62 can be located on the second connecting portion 22.

[0122] Reference Fig.10 , showing the preparation process of the photovoltaic module described in the embodiment of the present application Figure 1 .

[0123] The present application discloses a method for preparing a photovoltaic module, the method comprising:

[0124] 101. Provide a battery cell body 10. The battery cell body 10 has a first surface and a second surface that are oppositely disposed.

[0125] The photovoltaic module disclosed in the embodiment of the present application includes a cell body 10, which is a core component of the photovoltaic module and can convert solar energy into electrical energy. The cell body 10 has a first surface and a second surface arranged opposite to each other. When the first surface is a light-receiving surface facing the sunlight, the second surface is a backlight surface facing away from the sunlight. When the first surface is a backlight surface facing away from the sunlight, the second surface is a light-receiving surface facing the sunlight.

[0126] The following description will be made by taking the first surface of the cell body 10 as the backlight surface facing away from the sunlight and the second surface of the cell body 10 as the light-receiving surface facing the sunlight as an example. That is, the solar cell disclosed in the embodiment of the present application is a back-contact solar cell.

[0127] 102. A connection portion 20 is formed on the first surface of the battery cell body 10 by screen printing. The connection portion 20 includes a first connection portion 21 and a second connection portion 22. The first connection portion 21 and the second connection portion 22 are arranged at intervals along a first direction A. The area of ​​the first connection portion 21 is greater than the area of ​​the second connection portion 22.

[0128] During the preparation of the photovoltaic module, a connection portion 20 is formed on the first surface of the battery cell body 10 by screen printing. The connection portion 20 includes a first connection portion 21 and a second connection portion 22. The first connection portion 21 and the second connection portion 22 are arranged at intervals along a first direction A on the first surface of the battery cell body 10, and the area of ​​the first connection portion 21 is larger than the area of ​​the second connection portion 22.

[0129] For example, the first connection portion 21 and the second connection portion 22 are both rectangular structures. Along the second direction B, the length of the first connection portion 21 is equal to the length of the second connection portion 22. Along the first direction A, the width of the first connection portion 21 is greater than the width of the second connection portion 22.

[0130] For another example, the first connection portion 21 and the second connection portion 22 are both rectangular structures, and along the second direction B, the length of the first connection portion 21 is equal to the length of the second connection portion, and along the first direction A, the width of the first connection portion is greater than the width of the second connection portion 22. The rectangular structure refers to a rectangular structure with chamfers, and the chamfers can be round or square.

[0131] Of course, the above are only individual examples of the specific structures of the first connection part 21 and the second connection part 22, and are not intended to be limiting of the present application. In actual applications, technicians can also set the specific structures of the first connection part 21 and the second connection part 22 as needed.

[0132] 103. A first bonding layer 30 is formed on the surface of the first connecting portion 21 away from the battery cell body 10 by screen printing. During printing, the scraper moves along the second direction B. The first bonding layer 30 includes at least two first bonding strips 31 of strip-like structure. 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 with the first direction A.

[0133] By screen printing, a first bonding layer 30 is formed on the surface of the first connection portion 21 away from the battery cell body 10, so as to improve the reliability of the connection between the electrical connection member 70 and the first connection portion 21 through the first bonding layer 30. Specifically, during the printing process, the scraper moves along the second direction B, and the first bonding layer 30 includes at least two first bonding strips 31 of strip structure, 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 scraper is consistent with the length direction of the first bonding strip 31.

[0134] Exemplarily, the first joining strips 31 in the embodiment of the present application may include two, three, four, or five. In the embodiment of the present application, there are no excessive restrictions on the specific number of the first joining strips 31. In actual applications, technicians can set the specific number of the first joining strips 31 as needed.

[0135] The second direction B in the embodiment of the present application intersects with the first direction A. Preferably, the second direction B intersects with the first direction A. For example, when the battery cell body 10 is a rectangular structure, the first direction A in the embodiment of the present application may be the width direction of the battery cell body 10 or the length direction of the battery cell body 10. If the first direction A is the width direction of the battery cell body 10, the second direction B may be the length direction of the battery cell body 10. If the first direction A is the length direction of the battery cell body 10, the second direction B may be the width direction of the battery cell body 10.

[0136] It should be noted that the first bonding layer 30 in the embodiment of the present application may be a tin layer or other conductive metal layer. In the embodiment of the present application, there are no excessive restrictions on the specific material of the first bonding layer 30. In practical applications, technicians can set the specific material of the first bonding layer 30 as needed. The following will take the first bonding layer 30 as a tin layer as an example to explain the present application.

[0137] During the processing of photovoltaic modules, a conductive connecting material, such as tin paste, can be applied to the surface of the first connecting part 21 away from the battery cell body 10 by screen printing to form a first bonding layer 30, that is, a tin layer, on the surface of the first connecting part 21 away from the battery cell body 10. The reliability of the connection between the electrical connector 70 and the first connecting part 21 is improved by the tin layer.

[0138] 104 , provide an electrical connector 70 , set the electrical connector 70 on the first bonding layer 30 , and extend along the first direction A. The electrical connector 70 is intersected with at least two first bonding strips 31 of the strip-shaped structure to be electrically connected to the first connecting portion 21 through the first bonding layer 30 .

[0139] The electrical connector 70 in the embodiment of the present application extends along the first direction A, and is disposed on a side of the first bonding layer 30 away from the first connection portion 21, and the electrical connector 70 is intersected with at least two first bonding strips 31 of a strip-shaped structure, so as to connect the electrical connector 70 to the first connection portion 21 through the first bonding layer 30. In other words, the electrical connector 70 extends along the first direction A, and the first bonding strip 31 is a strip-shaped structure, and the first bonding strip 31 of the strip-shaped structure extends along the second direction B, so that the second bonding strip 31 intersects with the electrical connector 70, thereby increasing the contact area between the electrical connector 70 and the first bonding strip 31, and making the connection between the electrical connector 70 and the first connection portion 21 more reliable.

[0140] It should be noted that the electrical connector 70 in the embodiment of the present application may only include a metal strip body, or may include a metal strip body and a metal layer coated on the surface of the metal strip body. In the embodiment of the present application, there are no excessive restrictions on the specific structure of the electrical connector 70. In actual applications, technicians can set it as needed.

[0141] In the embodiment of the present application, the first bonding layer 30 is arranged on the surface of the first connection part 21 away from the battery cell body 10 by screen printing. During printing, the scraper moves along the second direction B. The first bonding layer 30 includes at least two first bonding strips 31 of strip-shaped structure, at least two first bonding strips 31 extend along the second direction B, and are arranged at intervals in the first direction A, that is, the movement direction of the scraper is the same as the extension direction of the first bonding strips 31. The electrical connector 70 is arranged on the side of the first bonding layer 30 away from the first connection part 21, and the electrical connector 70 is connected to the first connection part 21 through the first bonding layer 30. Through the above arrangement, the height of the first bonding strip 31 can be reduced, so that the height of the first bonding strip 31 is relatively low, and the first bonding strip 31 will not support the electrical connector 70, thereby reducing the risk of the electrical connector 70 being offset, improving the reliability of the connection between the electrical connector 70 and the first connection part 21, and ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0142] Furthermore, through the above arrangement, the reliability of the connection between the second connection part 22 adjacent to the first connection part 21 and the electrical connector 70 can be improved, thereby further improving the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0143] In addition, the electrical connector 70 extends along the first direction A and is arranged to intersect with the first connecting strips 31 of at least two strip structures. The electrical connector 70 is connected to the first connecting portion 21 through the first connecting layer 30, which can increase the contact area between the electrical connector 70 and the first connecting layer 30, thereby improving the reliability of the connection between the electrical connector 70 and the first connecting portion 21.

[0144] Reference Fig.11 , showing the preparation process of the photovoltaic module described in the embodiment of the present application Figure 2 .

[0145] 201 , providing a battery cell body 10 , wherein the battery cell body 10 has a first surface and a second surface that are oppositely disposed.

[0146] Step 201 in the embodiment of the present application is the same as step 101 in the above embodiment, and the relevant contents are referred to in the above embodiment.

[0147] 202. A connection portion 20 is formed on the first surface of the battery cell body 10 by screen printing. The connection portion 20 includes a first connection portion 21 and a second connection portion 22. The first connection portion 21 and the second connection portion 22 are arranged at intervals along a first direction A. The area of ​​the first connection portion 21 is greater than the area of ​​the second connection portion 22.

[0148] Step 202 in the embodiment of the present application is the same as step 102 in the above embodiment, and the relevant contents are referred to in the above embodiment.

[0149] 203. A first bonding layer 30 is provided on a surface of the first connecting portion 21 away from the battery cell body 10 by screen printing. During printing, the scraper moves along the second direction. The first bonding layer 30 includes at least two first bonding strips 31 and a third bonding strip 32 of a strip structure. At least two first bonding strips 31 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 located on the central axis of the first connecting portion 21.

[0150] By screen printing, a first bonding layer 30 is formed on the surface of the first connection part 21 away from the battery cell body 10, so as to improve the reliability of the connection between the electrical connector 70 and the first connection part 21 through the first bonding layer 30. Specifically, the first bonding layer 30 includes at least two first bonding strips 31 and third bonding strips 32 in a strip structure, and at least two first bonding strips 31 extend along the second direction B and are arranged at intervals along the first direction A. During printing, the scraper moves along the second direction B so that the movement direction of the scraper is the same as the length direction of the first bonding strip 31. 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 connection part 21.

[0151] That is to say, the first bonding layer 30 in the embodiment of the present application may also include a third bonding strip 32, which is in the form of a long strip extending along the first direction A, and the third bonding strip 32 is located on the central axis of the first connecting portion 21. The electrical connector 70 extends along the first direction A, and the third bonding strip 32 is located between the electrical connector 70 and the first connecting portion 21. The provision of the third bonding strip 32 can further improve the connection reliability between the electrical connector 70 and the first connecting portion 21, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0152] 204. A second bonding layer is formed on the surface of the second connecting portion 22 away from the battery cell body 10 by screen printing. During printing, the scraper moves along the second direction B. The second bonding layer includes a second bonding strip 40 with a strip structure. The second bonding strip 40 extends along the second direction B. The second bonding strip 40 is arranged to intersect with the electrical connector 70. The electrical connector 70 is electrically connected to the second connecting portion 22 through the second bonding layer.

[0153] In the embodiment of the present application, a second bonding layer is provided on the surface of the second connection part 22 away from the battery cell body 10 by screen printing, and the electrical connector 70 is connected to the second connection part 22 by the second bonding layer to improve the reliability of the connection between the electrical connector 70 and the second connection part 22.

[0154] The second bonding layer in the embodiment of the present application includes a second bonding strip 40 with a strip structure, and the second bonding strip 40 extends along the second direction B. During printing, the scraper moves along the second direction B so that the movement direction of the scraper is the same as the extension 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 electrical connector 70 will not be supported by the first bonding strip 31 or the second bonding strip 40, thereby helping to improve the reliability of the connection between the electrical connector 70 and the first connecting portion 21 and the second connecting portion 22, and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0155] 205 , provide an electrical connector, set the electrical connector 70 on the first bonding layer 30 , and the electrical connector 70 extends along the first direction A, and the electrical connector 70 is arranged to intersect with at least two first bonding strips 31 of the strip structure to be electrically connected to the first connecting portion 21 through the first bonding layer 30 .

[0156] The electrical connector 70 is also disposed on the second bonding layer and extends along the first direction A. The electrical connector 70 intersects with the second bonding strip 40 and is electrically connected to the second connection portion 22 through the second bonding layer.

[0157] The electrical connector 70 in the embodiment of the present application extends along the first direction A, and is disposed on the side of the first bonding layer 30 away from the first connection portion 21 and the side of the second bonding layer away from the second connection portion 22, so that the extension direction of the electrical connector 70 intersects with the extension directions of the first bonding strip 31 and the second bonding strip 40, and the electrical connector 70 is connected to the first connection portion 21 through the first bonding layer 30, and is connected to the second connection portion 22 through the second bonding layer. The contact area between the electrical connector 70 and the first bonding strip 31 and the contact area between the electrical connector 70 and the second bonding strip 40 are increased, so that the connection between the electrical connector 70 and the first bonding strip 31 is more reliable, and the connection between the electrical connector 70 and the second bonding strip 40 is more reliable.

[0158] It should be noted that the electrical connector 70 in the embodiment of the present application may only include a metal strip body, or may include a metal strip body and a metal layer coated on the surface of the metal strip body. In the embodiment of the present application, there are no excessive restrictions on the specific structure of the electrical connector 70. In actual applications, technicians can set it as needed.

[0159] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0160] Although the optional embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the present application.

[0161] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0162] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A photovoltaic module, characterized in that: include: A battery cell body, wherein the battery cell body has a first surface and a second surface arranged opposite to each other; A connecting portion, the connecting portion is disposed on the first surface, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are arranged at intervals along a first direction, and an area of ​​the first connecting portion is greater than an area of ​​the second connecting portion; A first bonding layer, the first bonding layer is disposed on a surface of the first connecting portion away from the battery cell body, the first bonding layer comprises at least two first bonding strips in a strip-shaped structure, at least two of the first bonding strips extend along a second direction and are arranged at intervals along the first direction, and the second direction intersects the first direction; An electrical connector is disposed on the first bonding layer, extends along the first direction, and is intersected with the first bonding strips of the at least two strip-shaped structures, and is electrically connected to the first connecting portion through the first bonding layer.

2. The photovoltaic module according to claim 1, characterized in that: Along the first direction, the first connecting portion is located close to the edge of the battery cell body; Compared with the first connection portion, the second connection portion is located relatively far away from the edge of the battery cell body.

3. The photovoltaic module according to claim 1, characterized in that: Along the second direction, the width of the first connecting portion is equal to the width of the second connecting portion; Along the first direction, the length of the first connection portion is greater than the length of the second connection portion.

4. The photovoltaic module according to any one of claims 1 to 3, characterized in that: 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 cell body, the second bonding layer includes a second bonding strip with a strip-shaped structure, the second bonding strip extends along the second direction, the second bonding strip is arranged to intersect with the electrical connecting piece, and the electrical connecting piece is electrically connected to the second connecting part through the second bonding layer.

5. The photovoltaic module according to claim 4, characterized in that: The second joining strip has the same size as the first joining strip.

6. The photovoltaic module according to claim 1, characterized in that: At least two of the first joining strips are spaced apart from each other on the first connecting portion; Alternatively, the bottoms of at least two of the first joining strips are connected to each other at the first connecting portion.

7. The photovoltaic module according to claim 1, characterized in that: The first joining strip extends along the second direction and has a rectangular structure; And / or, the first joining strip extends along the second direction and has a racetrack-shaped structure.

8. The photovoltaic module according to claim 1, characterized in that: The first joint strip is a polygonal structure, wherein: The number of sides of the polygonal structure is 4N, satisfying N≥2.

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

10. The photovoltaic module according to claim 9, characterized in that: The first bonding layer is in at least one of an I-shaped structure, a Gan-shaped structure, a Shi-shaped structure, and a Wang-shaped structure.

11. The photovoltaic module according to claim 1, characterized in that: Along the first direction, the width of the first connecting strip is smaller than the width of the second connecting portion; And / or, along the second direction, the length of the first connecting strip is smaller than the length of the second connecting portion.

12. The photovoltaic module according to claim 1, characterized in that: The first surface is the backlight surface of the battery cell body.

13. A method for preparing a photovoltaic module, characterized in that: The method comprises: Providing a battery cell body, wherein the battery cell body has a first surface and a second surface disposed opposite to each other; Forming a connection portion on the first surface of the battery cell body by screen printing, wherein the connection portion includes a first connection portion and a second connection portion, the first connection portion and the second connection portion are arranged at intervals along a first direction, and an area of ​​the first connection portion is larger than an area of ​​the second connection portion; A first bonding layer is formed on a surface of the first connection portion away from the battery cell body by screen printing, wherein a scraper moves along a second direction during printing, wherein the first bonding layer comprises at least two first bonding strips in a strip-like structure, wherein at least two first bonding strips extend along the second direction and are arranged at intervals along the first direction, and wherein the second direction intersects the first direction; An electrical connector is provided and disposed on the first bonding layer. The electrical connector extends along the first direction and is disposed to intersect with the first bonding strips of the at least two strip-shaped structures so as to be electrically connected to the first connecting portion through the first bonding layer.

14. The method for preparing a photovoltaic module according to claim 13, characterized in that: The method further comprises providing an electrical connector, disposing the electrical connector on the first bonding layer, and extending the electrical connector along the first direction, and intersecting the first bonding layer of at least two strip-shaped structures so as to be electrically connected to the first connecting portion through the first bonding layer: A second bonding layer is formed on the surface of the second connecting portion away from the battery cell body by screen printing. During printing, the scraper moves along the second direction. The second bonding layer includes a second bonding strip with a strip structure. The second bonding strip extends along the second direction. The second bonding strip is arranged to intersect with the electrical connector, and the electrical connector is electrically connected to the second connecting portion through the second bonding layer.

15. The method for preparing a photovoltaic module according to claim 13, characterized in that: The method of forming a first bonding layer on a surface of the first connection portion away from the battery cell body by screen printing, wherein during printing, a scraper moves along a second direction, the first bonding layer includes at least two first bonding strips of a strip structure, and at least two of the first bonding strips extend along the second direction and are arranged at intervals along the first direction further includes: A first bonding layer is formed on the surface of the first connecting portion away from the battery cell body by screen printing. During printing, the scraper moves along the second direction. The first bonding layer includes at least two first bonding strips and a third bonding strip of a strip structure. At least two of the first bonding strips extend along the second direction and are arranged at intervals along the first direction. The third bonding strip extends along the first direction and is located on the central axis of the first connecting portion.

16. A screen, characterized in that: The screen is provided with a plurality of mesh holes, the plurality of mesh holes comprising at least two first mesh holes and a plurality of second mesh holes spaced apart along a first direction, the first mesh holes are used to form a first joining strip, and the second mesh holes are used to form a second joining strip; The distance between two adjacent first meshes is smaller than the distance between two adjacent second meshes.

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