Photovoltaic module, method for preparing photovoltaic module and screen

Abstract

The present application discloses a photovoltaic module, a method for preparing a photovoltaic module, and a screen, belonging to the field of photovoltaic technology. The photovoltaic module includes a cell body, the cell body having a first surface and a second surface arranged opposite to each other; a connecting portion, the connecting portion being arranged on the first surface, the connecting portion including a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being arranged at intervals along a first direction, the area of ​​the first connecting portion being larger than the area of ​​the second connecting portion; a first bonding layer, the first bonding layer being arranged on a surface of the first connecting portion away from the cell body, the first bonding layer including at least two first bonding strips of a strip structure, the at least two first bonding strips extending along a second direction and arranged at intervals along the first direction; and an electrical connector, the electrical connector being arranged on the first bonding layer, the electrical connector extending along the first direction and intersecting with the at least two first bonding strips of the strip structure, the electrical connector being electrically connected to the first connecting portion through the first bonding layer.

Description

[0001] This application claims priority to 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 herein by reference. 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, converting solar energy into electricity. The surface of the solar cell is equipped with multiple fine grids extending in a first direction and spaced apart in a second direction. These grids collect the current generated by the cell. The surface is also equipped with multiple solder pads spaced apart in the second direction. Through these solder pads, solder ribbons are connected to the fine grids to collect the current collected by the grids.

[0004] In the prior art, in order to improve the reliability of the connection between the soldering ribbon 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, the welding process between the soldering ribbon and the pad may easily lead to unreliable welding and cold solder joints, which affects 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 soldering pads and the small area of ​​other soldering pads, there may be unreliable soldering, cold soldering, and the like during the soldering process between the soldering strip and the soldering 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 the first aspect, the present application discloses a photovoltaic module, which includes a cell body, the 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 the surface of the first connecting portion away from the 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 structure, and the electrical connector is electrically connected to the first connecting portion through the first bonding layer.

[0009] In an embodiment of the present application, a first bonding layer is provided on the surface of the first connecting portion away from the battery cell body, the first bonding layer including at least two first bonding strips, the at least two first bonding strips being spaced apart along the first direction, and the first bonding strips being in a strip-shaped structure extending along the second direction, an electrical connector is provided on the first bonding layer, the electrical connector extending along the first direction, and intersecting with the at least two first bonding strips of the strip structure, so as to connect the electrical connector to the first connecting portion through the first bonding layer. Through the above-mentioned arrangement, the height of the first bonding strip can be reduced, so that the height of the first bonding strip is relatively low, 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 connecting portion, and ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module. Furthermore, through the above-mentioned arrangement, the reliability of the connection between the second connecting portion adjacent to the first connecting portion 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. In addition, the electrical connector extends along the first direction and intersects or is arranged perpendicular to each first connecting strip of at least two strip structures. The electrical connector is connected to the first connecting portion through the first bonding 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 large area of ​​the first connection portion 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 large, 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 widen the process window for printing the first bonding layer and improve the fault tolerance of printing the first connection part of the first bonding layer. In addition, the first connection part is a marking point in the printing process of the first bonding layer, and its larger size 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 a surface of the second connecting portion away from the solar cell body, the second bonding layer includes a second bonding strip having a strip-shaped structure, the second bonding strip extending along the second direction, the second bonding strip intersecting the electrical connector, and the electrical connector being electrically connected to the second connecting portion via the second bonding layer. This arrangement ensures that the height of the second bonding strip is close to that of the first bonding strip, and the electrical connector is not supported by the first or second bonding strips, thereby improving the reliability of the connection between the electrical connector and the first and second connecting portions, thereby ensuring the photovoltaic module's photoelectric conversion efficiency.

[0015] Optionally, the second joining strip and the first joining strip have the same size. This arrangement allows the height of the second joining strip to be closer to that of the first joining strip, preventing the electrical connector from being supported by either the first or second joining strip, thereby further improving the reliability of the connection between the electrical connector and the first and second connecting portions, thereby ensuring the photovoltaic 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 connecting portion; or, at least two of the first bonding strips are connected at their bottoms on the first connecting portion. This arrangement allows the first bonding layer to more reliably connect the electrical connector to the first connecting portion, thereby ensuring the photovoltaic module's photoelectric conversion efficiency.

[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 to have a rectangular structure extending along the second direction, and / or the first joining strip is arranged to have a runway-type structure extending along the second direction, so as to improve the high consistency of the first joining strip, improve the uniformity of printing of the first joining strip, 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 photovoltaic module manufacturing process, metal paste is screen-printed onto the surface of the first connection portion facing away from the cell body to form the first bonding strip. During the screen printing process, if the first bonding strip is rectangular, metal paste can easily remain at the corners of the screen, resulting in poor printing. However, rounded corners in a rectangular or racetrack-shaped structure can improve the demolding efficiency of the first bonding strip and make the height of the first bonding strip more uniform.

[0020] Furthermore, the first connecting portion of the first connecting strip having a rectangular structure or a racetrack structure is not easily printed during the printing process, 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 has 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 temporarily melt and be pressed by the ejector pin, posing a risk of the first joining strip and the electrical connector being pressed out of the first connecting portion. Compared to first joining strips with quadrilateral structures such as rectangular or square structures, the corners of a polygonal first joining strip are further away from the edge of the first connecting portion. This can increase the tolerance for the first joining strip deviating from the first connecting portion, thereby reducing the probability of a short circuit in the photovoltaic module and improving the yield 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, 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 has at least one of an I-shaped structure, a spherical structure, a spherical structure, and a spherical structure. In the embodiment of the present application, by configuring the first bonding layer to have at least one of an I-shaped structure, a spherical structure, a spherical structure, and a spherical 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 connecting portion; and / or, along the second direction, the length of the first bonding strip is smaller than the length of the second connecting portion. This configuration allows the area of ​​the first bonding strip to be controlled, allowing at least two first bonding strips to be positioned within the first connecting portion. This reduces the height of the first bonding layer, prevents the first bonding layer from supporting the electrical connector, and reduces the risk of electrical connector displacement, thereby improving 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 cell body, the 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 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, the area of ​​the first connecting portion being larger than the area of ​​the second connecting portion; forming a first bonding layer on the surface of the first connecting portion away from the cell body by screen printing, during printing, the 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 being arranged to intersect 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, the electrical connector is provided and arranged on the first bonding layer, and the electrical connector extends along the first direction, and 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 connection part through the first bonding layer. The method also includes: forming a second bonding layer on the surface of the second connection 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 connection part through the second bonding layer.

[0028] Optionally, the method further comprises: forming a first bonding layer on the surface of the first connecting portion away from the battery cell body by screen printing, and moving the scraper along the second direction during printing, 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; 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 arranged thereon, the plurality of mesh holes including at least two first mesh holes and a plurality of second mesh holes arranged at intervals along a first direction, the first mesh holes being used to form a first joining strip, and the second mesh holes being used to form a second joining strip; the distance between two adjacent first mesh holes is 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 the 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 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 connecting portion away from the solar cell body. The first bonding layer includes at least two first bonding strips in a strip-like structure. The at least two first bonding strips extend along the second direction and are spaced apart along the first direction. An electrical connector is provided on the first bonding layer. The electrical connector extends along the first direction and intersects with the at least two first bonding strips in the strip-like structure, so that the electrical connector is connected to the first connecting portion through the first bonding layer. This arrangement reduces the height of the first bonding strips and prevents them from supporting the electrical connector, thereby reducing the probability of the electrical connector being displaced, improving the reliability of the connection between the electrical connector and the first connecting portion, and ensuring the photovoltaic conversion efficiency of the photovoltaic module.

[0032] Furthermore, the above arrangement can also improve the reliability of the connection between the second connection portion adjacent to the first connection portion and the electrical connector, thereby helping to improve the yield of the photovoltaic module and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0033] In addition, the electrical connector extends along the first direction and is arranged to intersect with the first connecting strips of at least two strip-shaped 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 this application Figure 1 ;

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

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

[0038] Figure 5 Schematic diagram showing the structure of the screen described in the embodiment of the present application Figure 1 ;

[0039] Figure 6 Schematic diagram showing the structure of the screen described in the embodiment of the present application Figure 2 ;

[0040] Figure 7 Schematic diagram showing the structure of the screen described in the embodiment of the present application Figure 3 ;

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

[0042] Figure 9 Another schematic diagram showing the structure of the first mesh in the screen according to the embodiment of the present application;

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

[0044] Figure 11 The preparation process of the photovoltaic module described in the embodiment of this 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 joint 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 this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the fixed scope of this application.

[0055] It should be understood that references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0056] Reference Figure 1 , shows a schematic structural diagram of the photovoltaic assembly described in the embodiment of the present application; Figure 2 , showing a schematic diagram of the local structure of the photovoltaic module in the embodiment of the present application Figure 1 ;reference Figure 3 , showing a schematic diagram of the local structure of the photovoltaic module in the embodiment of the present application Figure 2 ;reference Figure 4 , shows a schematic structural diagram of the pad described in an 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 cell body 10, the cell body 10 having 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 cell body 10, the first bonding layer 30 includes at least two first bonding strips 31 with strip structures, the 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, an 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 with strip structures, 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 embodiments of the present application includes a cell body 10. Cell body 10, as the core component of the photovoltaic module, can convert solar energy into electrical energy. Cell body 10 has a first surface and a second surface arranged opposite each other. When the first surface is the light-receiving surface facing sunlight, the second surface is the backlight surface facing away from sunlight. When the first surface is the backlight surface facing away from sunlight, the second surface is the light-receiving surface facing sunlight.

[0059] The following description of this application will be based on an example in which the first surface of the cell body 10 is the backlight side facing away from the sunlight, and the second surface of the cell body 10 is the light-receiving side facing the sunlight. In other words, the solar cell disclosed in the embodiment of this 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 cell body 10. The connection portion 20 includes a first connection portion 21 and a second connection portion 22, which are arranged on the first surface of the cell body 10 at intervals along the first direction A, and the area of ​​the first connection portion 21 is larger 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 both have a quasi-rectangular structure. Along the second direction B, the length of the first connection portion 21 is equal to the length of the second connection portion. Along the first direction A, the width of the first connection portion is greater than the width of the second connection portion 22. A quasi-rectangular structure refers to a rectangular structure with chamfered corners, which can be rounded or square.

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

[0064] like Figures 1 to 4 As shown, a first bonding layer 30 is provided on the surface of the first connecting portion 21 away from the battery cell body 10 to improve the reliability of the connection between the electrical connector and the first connecting portion 21. Specifically, the first bonding layer 30 includes at least two first bonding strips 31 having a strip-like structure. 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] For example, 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] In the embodiment of the present application, the second direction B intersects the first direction A. Preferably, the second direction B intersects the first direction A. For example, when the battery cell body 10 has a rectangular structure, the first direction A in the embodiment of the present application can 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 can 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 can 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 another 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 actual applications, technicians can set the specific material of the first bonding layer 30 as needed. The following description of the present application will be based on the example of the first bonding layer 30 being a tin layer.

[0068] During the manufacturing process of the photovoltaic module, a conductive connecting material, such as tin paste, can be applied to the surface of the first connecting portion 21 away from the cell body 10 by screen printing, thereby forming a first bonding layer 30, i.e., a tin layer, on the surface of the first connecting portion 21 away from the cell body 10. The tin layer improves the reliability of the connection between the electrical connector and the first connecting portion 21. During the screen printing process, the scraper moves in 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. The electrical connector 70 is disposed on a side of the first bonding layer 30 away from the first connecting portion 21. The electrical connector 70 intersects with at least two strip-shaped first bonding strips 31 to connect the electrical connector 70 to the first connecting 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 strips 31 are strip-shaped, and the length direction of the first bonding strips 31 extends along the second direction B. This allows the extension direction of the electrical connector 70 to intersect with the extension direction of the first bonding strips 31, thereby increasing the contact area between the electrical connector 70 and the first bonding strips 31 and making the connection between the electrical connector 70 and the first connecting portion 30 more reliable.

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

[0072] In the embodiment of the present application, a first bonding layer 30 is provided on the surface of the first connecting portion 21 away from the cell body 10. The first bonding layer 30 includes at least two first bonding strips 31, which are arranged at intervals along the first direction A and have a strip-shaped structure extending along the second direction B. An electrical connector 70 is provided on the first bonding layer 30. The electrical connector 70 extends along the first direction A and intersects with the at least two strip-shaped first bonding strips 31, thereby connecting the electrical connector 70 to the first connecting portion 21 through the first bonding layer 30. This arrangement can reduce the height of the first bonding strips 31, making the height of the first bonding strips 31 relatively low. The first bonding strips 31 do not support the electrical connector 70, thereby reducing the risk of the electrical connector 70 shifting, improving the reliability of the connection between the electrical connector 70 and the first connecting portion 21, and ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0073] Furthermore, the above arrangement can also improve the reliability of the connection between the second connection portion 22 adjacent to the first connection portion 21 and the electrical connector 70, 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-shaped structures. The electrical connector 70 is connected to the first connecting portion 21 through the first bonding layer 30, which can increase the contact area between the electrical connector 70 and the first bonding layer 30, thereby improving the reliability of the connection between the electrical connector 70 and the first connecting portion 21.

[0075] Alternatively, as 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 opposite to each other, 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 to the first connection portion 21, the second connection portion 22 is located in a region relatively farther from the first side or 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 embodiments of the present application are generally rectangular structures, and the area of ​​the first connection portion 21 is larger than that of the second connection portion 22. The first connection portion 21 is located near the edge of the cell body 10. Compared to the first connection portion 21, the second connection portion 22 is located relatively further away from the edge of the cell body 10. By connecting the electrical connector 70 to the edge region of the cell body 10 via the first connection portion 21, the reliability of the connection between the electrical connector 70 and the edge region of the cell body 10 is improved, and the electrical connector 70 is prevented from shifting and causing photovoltaic module defects.

[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 fault 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 . The first connection portion 21 is relatively large in size and can provide a regular and square marking point for the capture camera, thereby further improving the printing yield of the first bonding layer 30 .

[0080] Alternatively, as 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 portion 21 and the second connection portion 22 in the embodiment of the present application are both rectangular structures, and the first connection portion 21 and the second connection portion 22 of the rectangular structure are spaced apart along the first direction A. Specifically, along the second direction B, the width of the first connection portion 21 is equal to the width of the second connection portion 22. And along the first direction A, the length of the first connection portion 21 is greater than the length of the second connection portion 22. As a result, the area of ​​the first connection portion 21 is greater than the area of ​​the second connection portion 22. The electrical connector 70 is connected to the edge area of ​​the battery 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 battery cell body 10 and preventing the electrical connector 70 from shifting and causing photovoltaic module defects.

[0082] Furthermore, the large area of ​​the first connecting portion 21 can also widen the process window for printing the first bonding layer 30, improving the error tolerance of printing the first connecting portion 21 in the first bonding layer 30. Furthermore, the first connecting portion 21 serves as a marking point during the printing process of the first bonding layer 30. Its large size 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, as Figures 1 to 4As shown, the photovoltaic module 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 connecting portion 22 away from the battery cell body 10 , and the electrical connector 70 is connected to the second connecting portion 22 through the second bonding layer to improve the reliability of the connection between the electrical connector 70 and the second connecting portion 22 .

[0085] The second bonding layer includes a second bonding strip 40 having a strip-shaped structure, and the second bonding strip 40 extends along the second direction B. This arrangement ensures that the height of the second bonding strip 40 is close to that of the first bonding strip 31, and the electrical connector 70 is not supported by the first bonding strip 31 or the second bonding strip 40, thereby improving the reliability of the connection between the electrical connector 70 and the first connecting portion 21 and the second connecting portion 22, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0086] Alternatively, as 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. For example, 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 supported 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, thereby ensuring 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 can 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. The at least two first bonding strips 31 are spaced apart from each other on the first connecting portion 21. In other words, 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 include at least two first bonding strips 31 spaced apart along the first direction A, with the bottoms of the at least two first bonding strips 31 connected to each other on the first connecting 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 the bonding strip and the at least two first bonding strips 31 are then connected to the electrical connector 70 to further improve the reliability of the connection between the first connecting portion 21 and the electrical connector 70, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0092] Alternatively, as 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 structure.

[0093] like Figures 1 to 4 As shown, in the embodiment of the present application, the first joining strip 31 can be provided in a quasi-rectangular structure extending along the second direction B. The quasi-rectangular structure can be a quasi-rectangular structure formed by providing circular chamfers at the four corners of the rectangular structure. It can be a quasi-rectangular structure formed by providing square chamfers at the four corners of the rectangular structure. It can also be a quasi-rectangular structure formed by providing 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 provided 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 is 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 an embodiment of the present application, the first joining strip 31 is arranged to have a rectangular structure extending along the second direction B, and / or the first joining strip 31 is arranged to have a runway-type structure extending along the second direction B, so as to improve the high consistency of the first joining strip 31 and improve the uniformity of printing of the first joining strip 31, thereby avoiding 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 photovoltaic module manufacturing process, metal paste is screen-printed onto the surface of the first connecting portion 21 facing away from the cell body 10 to form the first bonding strip 31. During the screen printing process, if the first bonding strip 31 is rectangular, metal paste can easily remain at the corners of the screen, resulting in poor printing. However, rounded corners of a quasi-rectangular or runway-shaped structure can improve the demolding properties 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 less likely 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, as 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 configured to have a polygonal structure, and the number of sides of the polygonal structure is 4N, where N ≥ 2. During the process of welding the electrical connector to the first connecting portion 21, the first joining strip 31 will temporarily melt and be pressed by the ejector pin, which may cause the first joining strip 31 and the electrical connector to be pressed out of the first connecting portion 21. Compared to the first joining strip 31 with a quadrilateral structure such as a rectangular structure or a square structure, the corners of the first joining strip 31 with a polygonal structure are farther away from the edge of the first connecting portion 21. This 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 in the photovoltaic module and improving the yield rate 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 do not serve as limitations 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, as 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 an 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 Gan-shaped structure, a Shi-shaped structure, and a Wang-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 Shi-shaped structure, or a Gan-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 Wang-shaped structure.

[0105] In an embodiment of the present application, by setting the first bonding layer 30 to have 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 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 an 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, the width of the first bonding strip 31 is set to be smaller than the width of the second connecting portion 22 along the first direction A, and / or the length of the first bonding strip 31 is set to be smaller than the length of the second connecting portion 22 along the second direction B. Through the above configuration, the area of ​​the first bonding strip 31 can be controlled, so that at least two first bonding strips 31 can be provided within the first connecting portion 21, thereby reducing the height of the first bonding layer 30, preventing the first bonding layer 30 from supporting the electrical connector 70, reducing the risk of the electrical connector 70 shifting, and thus improving 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 provided on the first surface of the cell body 10. The plurality of first fine grids 50 and the plurality of second fine grids 51 extend along the second direction B and are alternately arranged along the first direction A. The current generated by the 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. In other words, 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 that the current collected by the first fine grid 50 is collected through the first connection portion 21 and the second connection portion 22, and the collected current is transmitted to the electrical connector, and then the current is transmitted to the external circuit through the electrical connector.

[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 short-circuiting.

[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 connecting strips 31 , so as to connect the electrical connector to the first connecting portion 21 through at least two first connecting strips 31 , thereby improving the reliability of the connection between the electrical connector and the first connecting portion 21 .

[0116] Reference Figure 5 , showing the structure of the screen in the embodiment of the present application Figure 1 ;reference Figure 6 , showing the structure of the screen in the embodiment of the present application Figure 2 ;reference Figure 7 , showing the structure of the screen in the embodiment of the present application Figure 3 ;reference Figure 8 , shows a schematic structural diagram of the first mesh in the screen in the embodiment of the present application; Figure 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 provided, wherein the plurality of mesh holes include 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, and 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 present application also discloses a screen 60. Using the screen 60 disclosed in the present application, metal paste is printed on the surface of the first connecting portion 21 away from the cell body 10 and the surface of the second connecting portion 22 away from the cell body 10, thereby forming at least two first joining strips 31 on the surface of the first connecting portion 21 away from the cell body 10 and one second joining strip 40 on the surface of the second connecting portion 22 away from the cell body 10. This prevents metal paste from remaining at the edges and corners of the screen 60, thereby improving the printing yield of photovoltaic modules.

[0119] Furthermore, using the screen 60 disclosed in the embodiment of the present application, metal paste is printed on the surface of the first connecting portion 21 away from the battery cell body 10 to form at least two first bonding strips 31 on the surface of the first connecting portion 21 away from the battery cell body 10. Metal paste is printed on the surface of the second connecting portion 22 away from the battery cell body 10 to form a second bonding strip 40 on the surface of the second connecting portion 22 away from the battery cell body 10. This improves the demolding properties of the first bonding strip 31 and the second bonding strip 40, and the heights of the first bonding strip 31 and the second bonding strip 40 are more consistent. The first bonding strip 31 does not support the electrical connector, thereby reducing the risk of electrical connector deviation, improving the reliability of the connection between the electrical connector and the first connecting portion 21 and the second connecting portion 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 easily 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. This allows the first joining strip 31 formed by printing the first meshes 61 to be located on the first connecting portion 21, while the second joining strip 40 formed by printing the second meshes 62 to be located on the second connecting portion 22.

[0122] Reference Figure 10 , shows the preparation process of the photovoltaic module described in the embodiment of this application Figure 1 .

[0123] The present invention discloses a method for preparing a photovoltaic module, which comprises:

[0124] 101. Provide a battery cell body 10. The battery cell body 10 has a first surface and a second surface that are opposite to each other.

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

[0126] The following description of this application will be based on an example in which the first surface of the cell body 10 is the backlight side facing away from the sunlight, and the second surface of the cell body 10 is the light-receiving side facing the sunlight. In other words, the solar cell disclosed in the embodiment of this 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 the first direction A. The area of ​​the first connection portion 21 is larger 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 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 the first direction A on the first surface of the 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 both have a quasi-rectangular structure. Along the second direction B, the length of the first connection portion 21 is equal to the length of the second connection portion. Along the first direction A, the width of the first connection portion is greater than the width of the second connection portion 22. A quasi-rectangular structure refers to a rectangular structure with chamfered corners, which can be rounded or square.

[0131] Of course, the above are only individual examples of the specific structures of the first connecting portion 21 and the second connecting portion 22 and are not intended to limit the present application. In actual applications, technicians can also set the specific structures of the first connecting portion 21 and the second connecting portion 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 with a 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] A first bonding layer 30 is formed on the surface of the first connecting portion 21 away from the battery cell body 10 through screen printing. This improves the reliability of the connection between the electrical connector 70 and the first connecting portion 21 through the first bonding layer 30. Specifically, during the printing process, the scraper moves along the second direction B. The first bonding layer 30 includes at least two first bonding strips 31 in a strip-like structure. The at least two first bonding strips 31 are arranged at intervals along the first direction A, and the length of each first bonding strip 31 extends along the second direction B, so that the scraper's movement direction is consistent with the length direction of the first bonding strip 31.

[0134] For example, 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] In the embodiment of the present application, the second direction B intersects the first direction A. Preferably, the second direction B intersects the first direction A. For example, when the battery cell body 10 has a rectangular structure, the first direction A in the embodiment of the present application can 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 can 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 can 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 another 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 actual applications, technicians can set the specific material of the first bonding layer 30 as needed. The following description of the present application will be based on the example of the first bonding layer 30 being a tin layer.

[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 the first bonding strips 31 of at least two strip-shaped structures 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. The electrical connector 70 is disposed on a side of the first bonding layer 30 away from the first connecting portion 21. The electrical connector 70 intersects with at least two first bonding strips 31 of a strip-like structure, thereby connecting the electrical connector 70 to the first connecting 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 strips 31 are strip-like structures. The strip-like first bonding strips 31 extend along the second direction B, such that the second bonding strips 31 intersect with the electrical connector 70. This increases the contact area between the electrical connector 70 and the first bonding strips 31, making the connection between the electrical connector 70 and the first connecting portion 21 more reliable.

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

[0141] In the embodiment of the present application, a first bonding layer 30 is provided 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 with a strip-like 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 provided on the side of the first bonding layer 30 away from the first connecting portion 21, and the electrical connector 70 is connected to the first connecting portion 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. 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 connecting portion 21, and ensuring the photoelectric conversion efficiency of the photovoltaic module and the welding yield of the photovoltaic module.

[0142] Furthermore, the above arrangement can also improve the reliability of the connection between the second connection portion 22 adjacent to the first connection portion 21 and the electrical connector 70, 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-shaped structures. The electrical connector 70 is connected to the first connecting portion 21 through the first bonding layer 30, which can increase the contact area between the electrical connector 70 and the first bonding layer 30, thereby improving the reliability of the connection between the electrical connector 70 and the first connecting portion 21.

[0144] Reference Figure 11 , shows the preparation process of the photovoltaic module described in the embodiment of this application Figure 2 .

[0145] 201. Provide a battery cell body 10. The battery cell body 10 has a first surface and a second surface that are opposite to each other.

[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 connecting portion 20 is formed on the first surface of the battery cell body 10 by screen printing. The connecting portion 20 includes a first connecting portion 21 and a second connecting portion 22. The first connecting portion 21 and the second connecting portion 22 are arranged at intervals along the first direction A. The area of ​​the first connecting portion 21 is larger than the area of ​​the second connecting 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 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. The first bonding layer 30 includes at least two first bonding strips 31 and third bonding strips 32 of a 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 third bonding strip 32 extends along the first direction A and is located on the central axis of the first connecting portion 21.

[0150] 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, so as to improve the reliability of the connection between the electrical connector 70 and the first connecting portion 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-like structure. The 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 scraper's movement direction is the same as the length direction of the first bonding strips 31. The third bonding strip 32 extends along the first direction A and is located on the central axis of the first connecting portion 21.

[0151] That is, the first bonding layer 30 in the embodiment of the present application may further include a third bonding strip 32, which is an elongated strip extending along the first direction A and 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 an embodiment of the present application, a second bonding layer is provided on the surface of the second connection portion 22 away from the battery cell body 10 by screen printing, and the electrical connector 70 is connected to the second connection portion 22 through the second bonding layer to improve the reliability of the connection between the electrical connector 70 and the second connection portion 22.

[0154] In the embodiment of the present application, the second bonding layer includes a second bonding strip 40 having a strip-like structure, and the second bonding strip 40 extends along a second direction B. During printing, the scraper moves along the second direction B so that the scraper's movement direction is aligned with the extension direction of the second bonding strip 40. This arrangement ensures that the height of the second bonding strip 40 is close to that of the first bonding strip 31, and the electrical connector 70 is not supported by the first bonding strip 31 or the second bonding strip 40. This helps improve the reliability of the connection between the electrical connector 70 and the first connecting portion 21 and the second connecting portion 22, thereby 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 extend along the first direction A. The electrical connector 70 is intersected with the first bonding strips 31 of at least two strip-shaped structures 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. The electrical connector 70 is disposed on the side of the first bonding layer 30 away from the first connecting portion 21 and on the side of the second bonding layer away from the second connecting portion 22, such 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. The electrical connector 70 is connected to the first connecting portion 21 via the first bonding layer 30, and to the second connecting portion 22 via the second bonding layer. This increases the contact area between the electrical connector 70 and the first bonding strip 31, as well as the contact area between the electrical connector 70 and the second bonding strip 40, thereby making the connection between the electrical connector 70 and the first bonding strip 31 more reliable, and the connection between the electrical connector 70 and the second bonding strip 40 more reliable.

[0158] It should be noted that the electrical connector 70 in the embodiment of the present application may comprise only a metal strip body, or may comprise a metal strip body and a metal layer covering the surface of the metal strip body. In the embodiment of the present application, there are no additional restrictions on the specific structure of the electrical connector 70. In actual applications, technicians can configure 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 and similar parts between the various embodiments can be referenced to each other.

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

[0161] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity from another, and do not necessarily require or imply any actual relationship or order between these entities. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or terminal device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the article or terminal device comprising the element.

[0162] The above is a detailed introduction to the technical solution provided by the present application. Specific examples are used herein 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 scope. In summary, the contents 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, the battery cell body having a first surface and a second surface disposed opposite to each other; a connecting portion, the connecting portion being disposed on the first surface, the connecting portion comprising a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being spaced apart along a first direction, and an area of ​​the first connecting portion being larger than an area of ​​the second connecting portion; a first bonding layer, the first bonding layer being disposed on a surface of the first connecting portion away from the battery cell body, the first bonding layer comprising at least two first bonding strips in a strip-shaped structure, the at least two first bonding strips extending along a second direction and spaced apart along the first direction, the second direction intersecting the first direction; An electrical connector is disposed on the first bonding layer, extends along the first direction, and intersects 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 connecting portion is greater than the length of the second connecting portion.

4. The photovoltaic module according to any one of claims 1 to 3, characterized in that: The photovoltaic module further includes a second bonding layer, wherein The second bonding layer is arranged on the surface of the second connecting 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 arranged to intersect with the electrical connector, and the electrical connector is electrically connected to the second connecting portion 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 connecting 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 connector 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 connecting portions on the first surface of the battery cell body by screen printing, the connecting portions comprising a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being spaced apart along a first direction, and an area of ​​the first connecting portion being larger than an 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, wherein a scraper moves along a second direction during printing, wherein the first bonding layer includes at least two first bonding strips in a strip-like structure, wherein the 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 intersects with the first bonding strips of the at least two strip-shaped structures to be electrically connected to the first connection portion through the first bonding layer.

14. The method for preparing a photovoltaic module according to claim 13, wherein: The method further includes providing an electrical connector, disposing the electrical connector on the first bonding layer, and extending the electrical connector along the first direction, intersecting the first bonding layers of at least two strip-shaped structures to electrically connect 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, wherein: 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, wherein a scraper moves along a second direction during printing, and the first bonding layer includes 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. 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-shaped 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 including at least two first mesh holes and a plurality of second mesh holes spaced apart along a first direction, at least two of the first mesh holes are adjacently arranged along the 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; Along the first direction, a distance between two adjacent first meshes is smaller than a distance between two adjacent second meshes.

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