Photovoltaic module and preparation method thereof

Abstract

The embodiment of the invention provides a photovoltaic module and a preparation method thereof, and relates to the technical field of solar cells, the photovoltaic module comprises a solar cell, a plurality of first grid lines, a plurality of second grid lines and a mesh welding strip, the plurality of first grid lines and the plurality of second grid lines are arranged on the surface of the solar cell, each first grid line extends along a first direction, and each second grid line extends along a second direction. And each second grid line extends along a second direction. The net-shaped welding strip comprises a plurality of first welding strips and a plurality of second welding strips which are connected, each first welding strip extends in the first direction, and each second welding strip extends in the second direction. The first grid lines and the second grid lines are designed to be grid-shaped, the welding strips are designed to be net-shaped welding strips, in the welding process, alignment windows of the net-shaped welding strips and the grid-shaped grid lines are easier to control, and the welding reliability of the net-shaped welding strips and the grid-shaped grid lines is improved. The photovoltaic module is used for supplying power to a load.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a photovoltaic module and a preparation method thereof. Background Art

[0002] With the continuous development of photovoltaic technology, there is a need to continuously improve efficiency and reduce costs. The slurry consumption of solar cells needs to be gradually reduced, and busbar-free technology came into being.

[0003] In busbar-free technology, how to improve the reliability of welding between the welding strip and the secondary grid line has become an urgent problem to be solved in the field. Summary of the invention

[0004] The present application proposes a photovoltaic module and a preparation method thereof, aiming to improve the reliability of welding between welding strips and grid lines.

[0005] On the one hand, the present application provides a photovoltaic module, which includes a solar cell, a plurality of first grid lines, a plurality of second grid lines and a mesh welding belt, wherein the plurality of first grid lines are arranged on the surface of the solar cell, each of the first grid lines extends along a first direction, and the plurality of first grid lines are arranged along a second direction, and the first direction intersects with the second direction. The plurality of second grid lines are arranged on the surface of the solar cell, each of the second grid lines extends along the second direction, and the plurality of second grid lines are arranged along the first direction. The mesh welding belt includes a plurality of first welding belts and a plurality of second welding belts connected to each other, each of the first welding belts extends along the first direction, and the plurality of first welding belts are arranged along the second direction. Each second welding belt extends along the second direction, and the plurality of second welding belts are arranged along the first direction. The first welding belt is electrically connected to the first grid line, and the second welding belt is electrically connected to the second grid line.

[0006] In the photovoltaic module provided in the embodiment of the present application, by designing the first grid line and the second grid line into a grid shape, and designing the welding strip into a mesh welding strip, during the welding process, the alignment window between the mesh welding strip and the grid grid line is easier to control, thereby reducing the difficulty of welding the mesh welding strip and the grid grid line and improving the reliability of welding the mesh welding strip and the grid grid line.

[0007] Furthermore, the pre-compiled mesh welding tape corresponds to the layout design of the grid-shaped grid lines, thereby ensuring the consistency of the welding effects of the mesh welding tape and the grid lines.

[0008] According to an embodiment of the present application, the size of the first welding strip along the second direction is greater than the size of the first grid line along the second direction, and the size of the second welding strip along the first direction is greater than the size of the second grid line along the first direction.

[0009] Through the above-mentioned setting method, the line width of the mesh welding strip is made larger than the line width of the grid-like fine grid. Even if the alignment of the mesh welding strip and the grid-like fine grid is offset, the mesh welding strip can be ensured to contact and connect with the grid-like fine grid, thereby ensuring the welding offset window and reducing the difficulty of the alignment process.

[0010] According to one embodiment of the present application, a photovoltaic assembly includes a plurality of pairs of solar cells, each pair of solar cells includes a first solar cell and a second solar cell, and the first solar cell and the second solar cell are arranged along a second direction. Among the plurality of first welding strips of the mesh welding strip, a portion of the first welding strip is electrically connected to the plurality of first grid lines of the first solar cell, and another portion of the first welding strip is electrically connected to the plurality of first grid lines of the second solar cell. The plurality of second welding strips of the mesh welding strip are electrically connected to the plurality of second grid lines of the first solar cell, and are electrically connected to the plurality of second grid lines of the second solar cell, so as to realize the series connection of a pair of solar cells.

[0011] According to an embodiment of the present application, in the mesh welding tape, the number of first welding tapes is less than the number of second welding tapes.

[0012] According to an embodiment of the present application, on the surface of the same solar cell, the number of first grid lines is less than the number of second grid lines. By removing more horizontal first grid lines on the solar cell, the number of grid lines and the amount of silver paste required for preparing the grid lines are reduced, and the number of first welding strips in the mesh welding strip can also be reduced, thereby reducing the process cost. Alternatively, all first grid lines in the solar cell can be removed, and only the second grid lines are retained, further reducing the number of grid lines and the amount of silver paste consumed, and all first welding strips in the mesh welding strip can be removed, and only the second welding strips are retained, which can further reduce the material cost.

[0013] According to an embodiment of the present application, on the surface of the same solar cell, twice the number of first gridlines is less than the number of second gridlines, further reducing the number of first gridlines.

[0014] According to an embodiment of the present application, the number of first welding strips of the mesh welding strip is equal to the sum of the number of first grid lines of the first solar cell and the number of first grid lines of the second solar cell, and one first welding strip corresponds to and is connected to one first grid line. The number of second welding strips of the mesh welding strip is equal to the number of second grid lines of the first solar cell and the number of second grid lines of the second solar cell, and one second welding strip corresponds to and is connected to one second grid line of the first solar cell and one second grid line of the second solar cell.

[0015] According to an embodiment of the present application, a size of the first gate line along the second direction is equal to a size of the second gate line along the first direction.

[0016] According to an embodiment of the present application, the first gate line has a size smaller than 30 μm in the second direction and a thickness ranging from 3 μm to 10 μm. The second gate line has a size smaller than 30 μm in the first direction and a thickness ranging from 3 μm to 10 μm.

[0017] On the other hand, the present application also provides a method for preparing a photovoltaic module, the method comprising: forming a plurality of first grid lines and a plurality of second grid lines on the surface of a solar cell, wherein the first grid lines extend along a first direction, and the second grid lines extend along a second direction. Arranging a mesh welding belt on the surface of the solar cell, the mesh welding belt comprising a plurality of first welding belts and a plurality of second welding belts connected to each other, wherein the first welding belt extends along the first direction, and the second welding belt extends along the second direction. Welding the first welding belt to the first grid line, and welding the second welding belt to the second grid line.

[0018] The preparation method provided in the embodiment of the present application arranges the grid lines on the solar cell into a grid shape, and designs the welding strip into a mesh shape. During the welding process, it is easier to align the mesh welding strip with the grid-shaped grid lines, which reduces the difficulty of the welding process and is conducive to improving the consistency of the welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution in the present application, the following is a brief introduction to the drawings required for use in some embodiments of the present application. Obviously, the drawings described below are only drawings of some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, not the actual size of the product involved in the embodiments of the present application, or the actual process of the method.

[0020] Figure 1 A top view of a solar cell provided in an embodiment of the present application;

[0021] Figure 2 A top view of a mesh welding strip provided in an embodiment of the present application;

[0022] Figure 3 A structural diagram of a mesh welding ribbon and a solar cell after welding provided in an embodiment of the present application;

[0023] Figure 4 for Figure 3 A cross-sectional view of the structure along the section line AA';

[0024] Figure 5 for Figure 3 A cross-sectional view of the structure along section line BB';

[0025] Figure 6 A flow chart of a method for preparing a photovoltaic module provided in an embodiment of the present application;

[0026] Figure 7A to Figure 7C A diagram of the steps of the method for preparing a photovoltaic module provided in an embodiment of the present application.

[0027] Reference numerals:

[0028] 1. Photovoltaic module; 2. Solar cell; 21. First solar cell; 22. Second solar cell; 3. First grid line; 4. Second grid line; 5. Mesh welding strip; 51. First welding strip; 52. Second welding strip. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments provided by the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present application.

[0030] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, ie, meaning "including, but not limited to."

[0031] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0032] When describing some embodiments, the term "connection" and its derivative expressions may be used. The term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For example, when describing some embodiments, the term "connection" may be used to indicate that two or more components are in direct physical or electrical contact with each other.

[0033] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0034] Exemplary embodiments are described herein with reference to cross-sectional views that are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but include deviations in shape due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0035] An embodiment of the present application provides a photovoltaic assembly, the photovoltaic assembly comprising a solar cell, Figure 1 A top view of a solar cell provided in an embodiment of the present application.

[0036] See also Figure 1 The photovoltaic module 1 includes a solar cell 2, a first grid line 3 and a second grid line 4. Multiple first grid lines 3 are arranged on the surface of the solar cell 2. Each first grid line 3 extends along a first direction X. The first grid lines 3 can also be called "transverse grid lines". Multiple first grid lines 3 are arranged along a second direction Y. The first grid lines 3 are used to collect the current generated by the solar cell 2.

[0037] Exemplarily, the first direction X intersects with the second direction Y. For example, the first direction X is perpendicular to the second direction Y.

[0038] Exemplarily, the width of the first gate lines 3 (the dimension along the second direction Y) is less than 30 μm, the number of the first gate lines 3 may be 5 to 100, and the interval between two adjacent first gate lines 3 is greater than 1 mm.

[0039] Continue to see Figure 1 A plurality of second grid lines 4 are arranged on the surface of the solar cell 2, each second grid line 4 extends along the second direction Y, and the second grid lines 4 can also be called "longitudinal grid lines". The plurality of second grid lines 4 are arranged along the first direction X, and the second grid lines 4 are also used to collect the current generated by the solar cell 2.

[0040] Exemplarily, the width of the second gate lines 4 (the dimension along the first direction X) is less than 30 μm, the number of the second gate lines 4 may be 50 to 100, and the interval between two adjacent second gate lines 4 is greater than 1 mm.

[0041] In the photovoltaic module 1, no main grid line is arranged on the surface of the solar cell 2, and the first grid line 3 and the second grid line 4 are both fine grids. For example, the width of the first grid line 3 is equal to the width of the second grid line 4, and both widths are smaller than the width of the conventional main grid line. The first grid line 3 and the second grid line 4 form a grid-like fine grid.

[0042] In a conventional busbar-free design, the number of first gate lines 3 is greater than the number of second gate lines 4, for example, the number of first gate lines 3 is 100, and the number of second gate lines 4 is 8. In the embodiment of the present application, the number of first gate lines 3 is less than the number of second gate lines 4, for example, the number of first gate lines 3 is 5, and the number of second gate lines 4 is 50, thereby reducing the number of gate lines, thereby reducing the process cost.

[0043] The photovoltaic module 1 provided in the embodiment of the present application further includes a welding ribbon, Figure 2 A top view of the mesh welding strip provided in an embodiment of the present application.

[0044] See also Figure 2 The mesh welding strip 5 includes a plurality of first welding strips 51 and a plurality of second welding strips 52 connected to each other. Each first welding strip 51 extends along the first direction X. The first welding strip 51 can also be called a "transverse welding strip". The plurality of first welding strips 51 are arranged along the second direction Y. Each second welding strip 52 extends along the second direction Y. The second welding strip 52 can also be called a "longitudinal welding strip". The plurality of second welding strips 52 are arranged along the first direction X. The mesh welding strip 5 is formed by a plurality of first welding strips 51 and a plurality of second welding strips 52.

[0045] Exemplarily, the photovoltaic module 1 includes multiple pairs of solar cells 2, each mesh welding ribbon 5 corresponds to and is welded to a pair of solar cells 2, the mesh welding ribbon 5 is used to connect two solar cells 2 in series, and the mesh welding ribbon 5 can be connected to an external testing equipment to perform reliability testing on the solar cells 2.

[0046] Figure 3 A structural diagram of a mesh welding ribbon and a solar cell after welding provided in an embodiment of the present application; Figure 4 for Figure 3 A cross-sectional view of the structure along the section line AA'; Figure 5 for Figure 3 A cross-sectional view of the structure along section line BB'.

[0047] See also Figure 3 to Figure 5 The spacing between the plurality of first welding strips 51 is substantially equal to the spacing between the plurality of first gate lines 3, and one first welding strip 51 corresponds to and is connected to one first gate line 3. The spacing between the plurality of second welding strips 52 is substantially equal to the spacing between the plurality of second gate lines 4, and one second welding strip 52 corresponds to and is connected to one second gate line 4.

[0048] It can be understood that, through the mesh design of the welding strip, during the welding process, the alignment window between the mesh welding strip 5 and the grid line is easier to control, which reduces the difficulty of the welding process and simplifies the design of the string welding machine.

[0049] Furthermore, the pre-compiled mesh welding tape 5 corresponds to the layout design of the grid lines, thereby ensuring the consistency of the welding effect of the mesh welding tape 5 and the grid lines.

[0050] Exemplarily, each pair of solar cells 2 includes a first solar cell 21 and a second solar cell 22 , and the first solar cell 21 and the second solar cell 22 are arranged along the second direction Y.

[0051] Among the multiple first welding strips 51 of the mesh welding strip 5, a portion of the first welding strips 51 is electrically connected to the multiple first grid lines 3 of the first solar cell 21, and another portion of the first welding strips 51 is electrically connected to the multiple first grid lines 3 of the second solar cell 22. The multiple second welding strips 52 of the mesh welding strip 5 are electrically connected to the multiple second grid lines 4 of the first solar cell 21, and the multiple second welding strips 52 are also electrically connected to the multiple second grid lines 4 of the second solar cell 22, so as to realize the series connection of a pair of solar cells 2.

[0052] In some embodiments, see Figure 3 to Figure 5 On the surface of the same solar cell 2, twice the number of first grid lines 3 is less than the number of second grid lines 4. It can be understood that the sum of the numbers of first grid lines 3 on two solar cells 2 is not as large as the number of second grid lines 4 on one solar cell 2. By removing more horizontal first grid lines 3 on each solar cell 2, the number of grid lines set and the consumption of silver paste required for preparing the grid lines are reduced. In addition, the number of first welding strips 51 in the mesh welding strip 5 can also be reduced, thereby reducing the process cost.

[0053] In other embodiments, the first grid lines 3 in the solar cell 2 may be completely removed, and only the second grid lines 4 may be retained, further reducing the number of grid lines and the consumption of silver paste. In addition, the first solder strips 51 in the mesh solder strips 5 may be completely removed, and only the second solder strips 52 may be retained, which can further reduce material costs.

[0054] In some embodiments, see Figure 3 to Figure 5 One first welding strip 51 corresponds to one first grid line 3 , and the number of the first welding strips 51 of the mesh welding strip 5 is equal to the sum of the number of the first grid lines 3 of the first solar cell 21 and the second solar cell 22 .

[0055] Furthermore, a second welding strip 52 corresponds to a second grid line 4 of the first solar cell 21 and a second grid line 4 of the second solar cell 22, and the number of second welding strips 52 of the mesh welding strip 5 is equal to the number of second grid lines 4 in the first solar cell 21 and also equal to the number of second grid lines 4 in the second solar cell 22.

[0056] Since the sum of the numbers of the first gridlines 3 on two solar cells 2 is smaller than the number of the second gridlines 4 on one solar cell 2 , in the mesh welding ribbon 5 , the number of the first welding ribbons 51 is smaller than the number of the second welding ribbons 52 .

[0057] In some embodiments, see Figure 3 to Figure 5 , the width d1 of the first welding strip 51 (the dimension along the second direction Y) is greater than the width w1 of the first gate line 3 (the dimension along the second direction Y). For example, the width w1 of the first gate line 3 is less than 30 μm, the width w1 of the first gate line 3 is in the micron level, the thickness of the first gate line 3 ranges from 3 μm to 10 μm, and the width d1 of the first welding strip 51 is less than 0.2 mm, the width d1 of the first welding strip 51 is in the millimeter level.

[0058] The width d2 of the second welding strip 52 (the dimension along the first direction X) is greater than the width w2 of the second gate line 4 (the dimension along the first direction X). For example, the width w2 of the second gate line 4 is less than 30 μm, the width w2 of the second gate line 4 is in the micron level, the thickness of the second gate line 4 ranges from 3 μm to 10 μm, and the width d2 of the second welding strip 52 is less than 0.2 mm, and the width d2 of the second welding strip 52 is in the millimeter level.

[0059] Through the above-mentioned setting method, the line width of the mesh welding tape 5 is made larger than the line width of the grid-like fine grid. Even if the alignment of the mesh welding tape 5 and the grid-like fine grid is offset, the mesh welding tape 5 can be ensured to contact and connect with the grid-like fine grid, thereby ensuring the welding offset window and reducing the difficulty of the alignment process.

[0060] In some embodiments, see Figure 4 and Figure 5 The cross-sectional shape of the first welding strip 51 along the second direction Y may be circular, and the cross-sectional shape of the second welding strip 52 along the first direction X may also be circular. In addition, the cross-sectional shape of the first welding strip 51 and the second welding strip 52 may also be rectangular or trapezoidal, which is not limited in the embodiments of the present application.

[0061] The surfaces of the first welding strip 51 and the second welding strip 52 are further provided with a coating 6, which is a low-temperature melting point coating. For example, the material of the coating 6 may include a tin-lead-bismuth alloy (chemical formula: SnPbBi). During the welding process of the mesh welding strip 5 and the gate wire, the high temperature melts the coating 6 and the gate wire, and the two can form a good alloy contact layer, so that the mesh welding strip 5 is welded to the gate wire through the coating 6.

[0062] The embodiment of the present application also provides a method for preparing a photovoltaic module. Figure 6 A flow chart of a method for preparing a photovoltaic module provided in an embodiment of the present application; Figure 7A to Figure 7C A diagram of the steps of the method for preparing a photovoltaic module provided in an embodiment of the present application.

[0063] See also Figure 6 The method for preparing a photovoltaic module includes the following steps S1 to S3:

[0064] Step S1: See Fig. 7A A plurality of first grid lines 3 and a plurality of second grid lines 4 are formed on the surface of the solar cell 2, each of the first grid lines 3 extends along the first direction X, and the plurality of first grid lines 3 are arranged along the second direction Y. Each of the second grid lines 4 extends along the second direction Y, and the plurality of second grid lines 4 are arranged along the first direction X.

[0065] For example, a screen printing process may be used to print silver paste or silver-aluminum paste on the surface of the solar cell 2 , and the silver paste or silver-aluminum paste is sintered to form a plurality of first grid lines 3 and a plurality of second grid lines 4 .

[0066] Step S2: See Figure 7B , Figure 7B (b) is a cross-sectional view of (a) along the section line CC', wherein the mesh welding ribbon 5 is disposed on the surface of the solar cell 2, and the mesh welding ribbon 5 includes a plurality of first welding ribbons 51 and a plurality of second welding ribbons 52 connected to each other.

[0067] Illustratively, before laying the mesh solder strip 5 on the solar cell 2, an electroplating process can be used to form a coating 6 on the surface of the mesh solder strip 5. The coating 6 is a low-temperature melting point coating. For example, the material of the coating 6 may include a tin-lead-bismuth alloy, which can be used for subsequent welding of the mesh solder strip 5 with the grid line.

[0068] Step S3: See Figure 7C , heating is performed to melt the plating layer 6 , the first grid line 3 and the second grid line 4 , forming a good alloy contact layer, thereby realizing welding of the first welding strip 51 and the first grid line 3 , and welding of the second welding strip 52 and the second grid line 4 .

[0069] In the above-mentioned embodiment of the present application, the grid lines on the solar cell 2 are arranged in a grid shape, and the welding strip is designed in a mesh shape. During the welding process, it is easier to align the mesh welding strip 5 with the grid-shaped grid lines, which reduces the difficulty of the welding process and is conducive to improving the consistency of the welding effect.

[0070] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that a person skilled in the art can think of within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A photovoltaic module, characterized in that: include: Solar cells; A plurality of first grid lines are arranged on the surface of the solar cell; the first grid lines extend along a first direction, the plurality of first grid lines are arranged along a second direction, and the first direction intersects with the second direction; A plurality of second grid lines are arranged on the surface of the solar cell; the second grid lines extend along the second direction, and the plurality of second grid lines are arranged along the first direction; A mesh welding strip comprises a plurality of first welding strips and a plurality of second welding strips connected to each other, wherein the first welding strips extend along the first direction, and the plurality of first welding strips are arranged along the second direction; the second welding strips extend along the second direction, and the plurality of second welding strips are arranged along the first direction; the first welding strip is electrically connected to the first gate line, and the second welding strip is electrically connected to the second gate line.

2. The photovoltaic module according to claim 1, characterized in that: The dimension of the first welding strip along the second direction is greater than the dimension of the first gate line along the second direction; A size of the second welding strip along the first direction is greater than a size of the second gate line along the first direction.

3. The photovoltaic module according to claim 1, characterized in that: The photovoltaic assembly includes a plurality of pairs of solar cells, each pair of solar cells includes a first solar cell and a second solar cell, and the first solar cell and the second solar cell are arranged along the second direction; Among the plurality of first welding strips of the mesh welding strip, a portion of the first welding strips is electrically connected to the plurality of first grid lines of the first solar cell, and another portion of the first welding strips is electrically connected to the plurality of first grid lines of the second solar cell; The plurality of second welding strips of the mesh welding strip are electrically connected to the plurality of second grid lines of the first solar cell, and are also electrically connected to the plurality of second grid lines of the second solar cell.

4. The photovoltaic module according to claim 3, characterized in that: In the mesh welding strips, the number of the first welding strips is less than the number of the second welding strips.

5. The photovoltaic module according to claim 3 or 4, characterized in that: On the surface of a same solar cell, the number of the first grid lines is less than the number of the second grid lines.

6. The photovoltaic module according to claim 5, characterized in that: On the surface of a same solar cell, twice the number of the first grid lines is less than the number of the second grid lines.

7. The photovoltaic module according to claim 3, characterized in that: The number of the first welding strips of the mesh welding strip is equal to the sum of the number of the first grid lines of the first solar cell and the number of the first grid lines of the second solar cell; one first welding strip corresponds to and is connected to one first grid line; The number of second welding strips of the mesh welding strip is equal to the number of second grid lines of the first solar cell and the second grid lines of the second solar cell; one second welding strip corresponds to and is connected to one second grid line of the first solar cell and one second grid line of the second solar cell.

8. The photovoltaic module according to claim 1, characterized in that: A size of the first gate line along the second direction is equal to a size of the second gate line along the first direction.

9. The photovoltaic module according to claim 1, characterized in that: The dimension of the first gate line along the second direction is less than 30 μm, and the thickness of the first gate line is in the range of 3 μm to 10 μm; The dimension of the second gate line along the first direction is less than 30 μm, and the thickness of the second gate line is in the range of 3 μm to 10 μm.

10. A method for preparing a photovoltaic module, characterized in that: include: Forming a plurality of first grid lines and a plurality of second grid lines on a surface of the solar cell, wherein the first grid lines extend along a first direction, and the second grid lines extend along a second direction, and the first direction intersects with the second direction; Arranging a mesh welding ribbon on the surface of the solar cell, the mesh welding ribbon comprising a plurality of first welding ribbons and a plurality of second welding ribbons connected to each other, the first welding ribbons extending along the first direction, and the second welding ribbons extending along the second direction; The first welding strip is welded to the first gate line, and the second welding strip is welded to the second gate line.

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