Photovoltaic cell and photovoltaic module
By incorporating thickened grid lines at the edges of fine grid lines in photovoltaic cells, the issue of wire breakage during lamination is resolved, improving production yield and maintaining cost-effectiveness.
Patent Information
- Application Number
- CN202422320064.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-23
AI Technical Summary
In the prior art, the gate breakage occurs at the contact positions of the welding tape and the fine gate during the lamination process of photovoltaic cells, resulting in increased production cost and reduced efficiency.
In the second fine gate line of the photovoltaic cell, a bold gate line is arranged along both sides of the extension direction, and the contact surface between the welding tape and the gate line is increased, and the width and height of the gate line are optimized to improve the connection stability of the welding tape and the gate line.
It effectively avoids the phenomenon of gate breakage between welding tape and gate lines, reduces the cost of material for gate lines, and improves the preparation efficiency and yield of photovoltaic cells and modules.
Smart Images
Figure CN223110436U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of photovoltaic cells, and particularly to a photovoltaic cell and a photovoltaic module. Background Art
[0002] With the development of the photovoltaic industry, different technology iterations will bring more cost reduction solutions. The main gridless technology is the current main option. In a preparation process of a main gridless battery, a film can be used to pre-fix a low-temperature solder strip on the surface of the battery to achieve effective interconnection and collect the current collected by the fine grids. However, in the implementation stage of the existing technology, especially in the lamination process, the phenomenon of broken grids is likely to occur at the contact position between the solder strip and the fine grid.
[0003] Therefore, how to provide a photovoltaic cell that can avoid the phenomenon of broken grids at the contact position between the solder strip and the fine grid while ensuring the preparation cost is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model
[0004] In view of this, the purpose of the utility model is to provide a photovoltaic cell and a photovoltaic module, which solve the problem that in the implementation stage of the existing technology, especially in the lamination process, the phenomenon of broken grids is likely to occur at the contact position between the solder strip and the fine grid.
[0005] To solve the above technical problems, the utility model provides a photovoltaic cell, including:
[0006] A main body of the cell, a plurality of first fine grids located on a first surface of the main body of the cell, and a plurality of second fine grids intersecting with the first fine grids;
[0007] The first surface of the main body of the cell has a first intermediate region and first edge regions located on both sides of the first intermediate region along the extending direction of the second fine grids. At least part of the second fine grids in the first edge regions are thickened grid lines, and the second fine grids in the first intermediate region are unthickened grid lines.
[0008] Optionally, the distance between the end of the thickened grid line and the edge of the adjacent main body of the cell is 2 millimeters to 10 millimeters.
[0009] Optionally, the height of the thickened grid line is the same as the height of the unthickened grid line.
[0010] Optionally, the width of the thickened grid line is 20 micrometers to 80 micrometers, the width of the unthickened grid line is 10 micrometers to 50 micrometers, and the width of the thickened grid line is greater than the width of the unthickened grid line.
[0011] Optionally, the difference between the width of the thickened grid line and the width of the unthickened grid line is 8 to 12 micrometers.
[0012] Optionally, the first fine grid is perpendicular to the second fine grid;
[0013] And all the first fine grids are arranged in parallel, and the number of the first fine grids is greater than that of the second fine grids.
[0014] Optionally, a plurality of the first fine grids and a plurality of the second fine grids are arranged on the second surface of the cell body;
[0015] The second surface of the cell body has a second middle area and second edge areas on both sides of the second middle area along the extension direction of the second fine grid. At least part of the second fine grids in the second edge areas are thickened grid lines, and the second fine grids at the second middle area are unthickened grid lines.
[0016] The present utility model also provides a photovoltaic module, including a plurality of cells arranged in an array; the cells include middle cells and edge cells, and at least part of the edge cells are the photovoltaic cells as described above.
[0017] Optionally, the middle cell is a main-gridless cell.
[0018] Optionally, all the outermost cells among the edge cells are the photovoltaic cells.
[0019] It can be seen that the photovoltaic cell provided by the present utility model is a photovoltaic cell arranged at a position close to the edge of the photovoltaic module, including a cell body, a plurality of first fine grids located on the first surface of the cell body, and a plurality of second fine grids intersecting with the first fine grids. The first surface of the cell body has a first middle area and first edge areas on both sides of the first middle area along the extension direction of the second fine grid. At least part of the second fine grids in the first edge areas are thickened grid lines, and the second fine grids at the first middle area are unthickened grid lines. By setting at least part of the second fine grids at the position close to the edge as thickened grid lines on both sides along the extension direction in the second fine grids, the present utility model can increase the contact surface between the welding tape and the grid lines, avoid the phenomenon of broken grids, reduce the material consumption for preparing the grid lines, ensure the preparation cost, and improve the preparation efficiency of the overall photovoltaic cell and module.
[0020] In addition, the present utility model also provides a photovoltaic module, which also has the above beneficial effects. Description of the Drawings
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.
[0022] Figure 1 It is a schematic structural diagram of a photovoltaic cell provided by an embodiment of the present invention;
[0023] Figure 2 It is a schematic structural diagram of an existing photovoltaic cell;
[0024] Figure 3 It is a schematic structural diagram of a photovoltaic cell after laying welding tapes provided by an embodiment of the present invention;
[0025] Figure 4 It is a schematic structural diagram of a photovoltaic module provided by an embodiment of the present invention;
[0026] Figures 1 to 4 In the figure, the reference numerals are explained as follows:
[0027] 1 - Photovoltaic cell with thickened grid lines, 2 - Conventional photovoltaic cell;
[0028] 10 - Main body of the cell;
[0029] 20 - First fine grid;
[0030] 30 - Second fine grid, 31 - Thickened grid line, 32 - Unthickened grid line;
[0031] 40 - Welding tape. Specific embodiments
[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0033] Embodiment 1:
[0034] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a photovoltaic cell provided by an embodiment of the present invention. It includes:
[0035] The main body 10 of the cell, a plurality of first fine grids 20 located on the first surface of the main body 10 of the cell, and a plurality of second fine grids 30 intersecting with the first fine grids 20;
[0036] The first surface of the cell body 10 has a first intermediate region and first edge regions on both sides of the first intermediate region along the extending direction of the second fine grid 30. At least part of the second fine grid 30 in the first edge regions is a thickened grid line 31, and the second fine grid 30 at the first intermediate region is an unthickened grid line 32.
[0037] It should be noted that the specific structure of the existing photovoltaic cell can be referred to Figure 2 , Figure 2 which is a schematic structural diagram of an existing photovoltaic cell. The grid line widths of its various parts are kept consistent. In this embodiment, a plurality of first fine grids 20 located on the first surface of the cell body 10 intersect at least with some of the second fine grids 30. However, in practical applications, generally each first fine grid 20 intersects with all of the second fine grids 30. In this embodiment, the first intermediate region of the first surface of the cell body 10 is demarcated. At this time, the first intermediate region does not refer to a partial intermediate region in the first surface of the cell body 10, but is distinguished from the second intermediate region located on the second surface of the cell body 10 mentioned below. At this time, corresponding first edge regions are formed on both sides of the first intermediate region along the extending direction of the second fine grid 30. Here, the first edge regions are also distinguished from the second edge regions located on the second surface of the cell body 10 below. At this time, the second fine grid 30 at the first intermediate region is set as a conventional unthickened grid line 32. The conventional fine grid can refer to the size of the fine grid in the prior art, and at least part of the second fine grid 30 located in the first edge regions is set as a thickened grid line 31. The setting position of the thickened grid line 31 is the position set to prevent the second grid line from breaking when the welding strip 40 is arranged along the extending direction of the second fine grid 30. It should be further noted that in this embodiment, the welding strip 40 is arranged along the extending direction of the second fine grid 30 and covers the second fine grid 30. It can be referred to Figure 3 , Figure 3 which is a schematic structural diagram of a photovoltaic cell after laying the welding strip 40 provided by the embodiment of the present invention. That is, the number of the second fine grids 30 can be set to be the same as the number of the welding strips 40, and all the second fine grids 30 located in the first edge regions are set as thickened grid lines 31. On the basis of ensuring a relatively low grid line material cost, the phenomenon of the welding strip 40 and the second grid line breaking during lamination and other processes is improved, and the yield rate of the photovoltaic cell is increased. In this embodiment, the photovoltaic cell is set as the photovoltaic cell at the position close to the edge of the photovoltaic module, which can improve the position prone to grid line breakage, and improve the improvement effect while ensuring the cost.
[0038] In addition, this embodiment does not limit the proportion of the thickened grid line 31 in the second thin grid 30 within the first edge region. For example, the thickened grid line 31 can be a partial region of the second thin grid 30 within the first edge region, or the thickened grid line 31 can also be the entire region of the second thin grid 30 within the first edge region. The specific dimensions of the thickened grid line 31 are not limited in this embodiment, as long as it can improve or eliminate the phenomenon of grid breakage in subsequent process steps when the solder strip 40 contacts the second thin grid 30. It should be noted that the second surface of the cell body 10 in this embodiment can be set to a conventional structure, or it can also be set to the same structure as the first surface. In this embodiment, the first thin grid 20 and the second thin grid 30 are mainly made of Ag (silver) paste. The length of the thickened grid line 31 can be set to 10 mm to 40 mm, the direction is along the extension direction of the second thin grid 30, and the height of both the thickened grid line 31 and the unthickened grid line 32 can be set to 5 μm to 15 μm. Or, on the basis of not affecting the connection with the solder strip 40, the height of the thickened grid line 31 can be slightly higher than that of the unthickened grid line 32. This embodiment mainly thickens the cell grid lines to increase the metal contact between the grid lines and the solder strip 40, so as to achieve the purpose of solving grid breakage.
[0039] Further, in order to ensure the improvement effect on grid breakage, the distance between the end of the thickened grid line 31 and the edge of the adjacent cell body 10 can be set to 2 mm to 10 mm.
[0040] It should be noted that in this embodiment, the thickened grid line 31 in the second thin grid 30 is set at a position 2 mm to 10 mm away from the edge of the cell body 10, which can accurately improve the position where grid breakage exists in the cell body 10.
[0041] Further, in order to ensure good contact between the solder strip 40 and the cell surface, the height of the above-mentioned thickened grid line 31 can be set to be the same as that of the unthickened grid line 32.
[0042] It should be noted that in this embodiment, the height of the above-mentioned thickened grid line 31 is set to be the same as that of the base grid line. When laying the solder strip 40, there is no need to consider the problem of poor contact with the solder strip 40 caused by different surface heights of the second thin grid 30, thereby ensuring that the solder strip 40 smoothly conducts the current in the photovoltaic cell.
[0043] Further, in order to ensure that the thickened grid line 31 can effectively improve the phenomenon of grid breakage, the width of the above-mentioned thickened grid line 31 can be set to 20 μm to 80 μm, the width of the unthickened grid line 32 can be set to 10 μm to 50 μm, and the width of the thickened grid line 31 is greater than that of the unthickened grid line 32.
[0044] In this embodiment, the width of the thickened grid line 31 is set to be from 20 micrometers to 80 micrometers, and the width of the unthickened grid line 32 is set to be from 10 micrometers to 50 micrometers. However, the width of the unthickened grid line 32 is always smaller than that of the thickened grid line 31, and the width of the unthickened grid line 32 is adjusted according to the width of the thickened grid line 31. In this embodiment, the width of the thickened grid line 31 or the width of the unthickened grid line 32 is the width perpendicular to the extending direction of the grid line.
[0045] Further, in order to ensure the improvement effect of the thickened grid line 31 on the broken grid, the difference between the width of the above-mentioned thickened grid line 31 and the width of the unthickened grid line 32 can be set to be 8 to 12 micrometers.
[0046] It should be noted that in this embodiment, the difference between the width of the above-mentioned thickened grid line 31 and the width of the unthickened grid line 32 is set to be 8 to 12 micrometers, so as to avoid the problem that the improvement of the broken grid phenomenon is not obvious due to the small difference in width between the thickened grid line 31 and the unthickened grid line 32. Preferably, the difference between the width of the above-mentioned thickened grid line 31 and the width of the unthickened grid line 32 can be set to be 10 micrometers.
[0047] Further, in order to ensure the regularity and adaptability of the preparation of the photovoltaic cell, the above-mentioned first fine grid 20 can be set to be perpendicular to the second fine grid 30;
[0048] And all the first fine grids 20 are arranged in parallel, and the number of the first fine grids 20 is greater than the number of the second fine grids 30.
[0049] It should be noted that in this embodiment, the extending direction of the first fine grid 20 is set to be perpendicular to the extending direction of the second fine grid 30, and all the first fine grids 20 are arranged in parallel. At this time, all the second fine grids 30 are also arranged in parallel, which can ensure the regularity of the photovoltaic cell and reduce the preparation difficulty. At the same time, the number of the first fine grids 20 is set to be greater than the number of the second fine grids 30. That is, the second fine grid 30 is used as the busbar grid line, and the first fine grid 20 is used as the grid line for collecting the current generated by the photovoltaic cell body. It is necessary to ensure the number of grid lines to ensure the photoelectric conversion efficiency of the photovoltaic cell. In this embodiment, the number of the first fine grids 20 in the half-cell is generally from 110 to 180, and the number of the second fine grids 30 is generally from 5 to 20.
[0050] Further, in order to avoid the phenomenon of broken grid in the photovoltaic cell, it can be set that the second surface of the above-mentioned cell body 10 is provided with a plurality of first fine grids 20 and a plurality of second fine grids 30;
[0051] The second surface of the cell body 10 has a second middle region and second edge regions located on both sides of the second middle region along the extending direction of the second fine grid 30. At least part of the second fine grids 30 in the second edge regions are thickened grid lines 31, and the second fine grids 30 in the second middle region are unthickened grid lines 32.
[0052] It should be noted that in this embodiment, the second surface of the cell body 10 is also set to have the same structure as the first surface of the cell body 10, which can further avoid the phenomenon of broken grids in the photovoltaic cell and improve the yield of the photovoltaic cell. In addition, the structure of the second surface of the cell body 10 in this embodiment can be correspondingly referred to the structure of the first surface of the cell body 10, and the above further optimization embodiments regarding the first surface of the cell are also applicable to the structure of the second surface of the cell body 10.
[0053] The photovoltaic cell provided by the embodiment of the present invention is a photovoltaic cell disposed at a position near the edge of the photovoltaic module, including a cell body 10, a plurality of first fine grids 20 located on the first surface of the cell body 10, a plurality of second fine grids 30 intersecting with the first fine grids 20. The first surface of the cell body 10 has a first intermediate region and first edge regions located on both sides of the first intermediate region along the extending direction of the second fine grids 30. At least part of the second fine grids 30 in the first edge regions are thickened grid lines 31, and the second fine grids 30 in the first intermediate region are unthickened grid lines 32. By setting at least part of the second fine grids 30 near the edge position as thickened grid lines 31 on both sides along the extending direction in the second fine grids 30, the present invention can increase the contact surface between the solder strip 40 and the grid lines, avoid the phenomenon of broken grids, reduce the material consumption for preparing the grid lines, ensure the preparation cost, and improve the preparation efficiency of the overall photovoltaic cell and module.
[0054] In addition, in the embodiment of the present invention, by setting the thickened grid lines 31 in the second fine grids 30 at a position where the distance from the edge of the cell body 10 is 2 mm to 10 mm, the position where the broken grid phenomenon exists in the cell body 10 can be precisely improved; by setting the height of the above thickened grid lines 31 to be the same as the height of the unthickened grid lines 32, it can ensure that the solder strip 40 smoothly conducts the current in the photovoltaic cell; by setting the width of the thickened grid lines 31 to be 20 μm to 80 μm and the width of the unthickened grid lines 32 to be 10 μm to 50 μm, and the width of the thickened grid lines is greater than the width of the unthickened grid lines, the phenomenon of broken grids can be effectively improved; by setting the difference between the width of the above thickened grid lines 31 and the width of the unthickened grid lines 32 to be 8 to 12 μm, the improvement effect of the thickened grid lines 31 on broken grids is ensured; by setting the extending direction of the first fine grids 20 to be perpendicular to the extending direction of the second fine grids 30 and setting all the first fine grids 20 to be parallel, the regularity of the photovoltaic cell can be ensured, the preparation difficulty can be reduced, by setting the number of the first fine grids 20 to be greater than the number of the second fine grids 30, the number of grid lines can be ensured to ensure the photoelectric conversion efficiency of the photovoltaic cell; by setting the second surface of the cell body 10 to have the same structure as the first surface of the cell body 10, the phenomenon of broken grids in the photovoltaic cell can be further avoided and the yield of the photovoltaic cell can be improved.
[0055] The photovoltaic module provided by the embodiment of the present utility model will be introduced below. The photovoltaic module described below can be correspondingly referred to the photovoltaic cell described above.
[0056] Specifically, please refer to Figure 4 , Figure 4 which is a schematic structural diagram of a photovoltaic module provided by the embodiment of the present utility model, and may include a plurality of cell pieces arranged in an array; the cell pieces include middle cell pieces and edge cell pieces, and at least part of the edge cell pieces are the photovoltaic cells as described above.
[0057] It should be noted that, referring to the formation of a battery panel by arranging a plurality of batteries in an existing photovoltaic module, the photovoltaic cell 1 with thickened grid lines as described above is specifically arranged at the position near the edge around the photovoltaic module, that is, the above-mentioned edge cell pieces. The cell pieces at the remaining positions can be set as existing cell pieces.
[0058] Furthermore, in order to ensure the improvement effect of the photovoltaic module on the device, the middle cell pieces can be set as main-gridless cell pieces.
[0059] It should be noted that in this embodiment, by setting the middle cell pieces as main-gridless cell pieces and the edge cell pieces as the photovoltaic cells including thickened grid lines 31 as described above, that is, to improve the situation that the cell pieces at the edge position are prone to grid breakage during the lamination process of the main-gridless cell pieces, and the adaptability of the battery can be further improved.
[0060] Furthermore, in order to ensure the improvement effect of the photovoltaic cell on the grid breakage during processing, all the outermost cell pieces of the edge cell pieces can be set as photovoltaic cells.
[0061] It should be noted that in this embodiment, the above-mentioned photovoltaic cell 1 with thickened grid lines is arranged on the outermost side of the photovoltaic module, which can improve the improvement effect on the grid breakage of the second fine grid 30 in contact with the solder tape 40 during processes such as lamination without significantly increasing the preparation cost. As Figure 4 , the dotted line frames the cell pieces at the positions near the edge around the perimeter, and inside the dotted line frame is the conventional cell piece 2. In this embodiment, when the photovoltaic module enters the laminator stage, the perimeter area of the module is often prone to grid breakage due to the influence of the machine pressure. This patent uses the battery stencil with the above structure to enable good metal contact between the grid lines of the photovoltaic cells at the edge of the module and the solder tape to solve the grid breakage problem.
[0062] Applying the photovoltaic module provided by the embodiment of the present utility model, which includes a plurality of cell pieces arranged in an array. The cell pieces include middle cell pieces and edge cell pieces, and at least some of the edge cell pieces are photovoltaic cells as described above. By setting at least some of the edge cell pieces as the photovoltaic cells as described above, the present utility model can improve the positions prone to grid breakage, and improve the improvement effect while ensuring the cost. In addition, by setting the middle cell pieces as main-gridless cell pieces in the embodiment of the present utility model, the improvement effect of the photovoltaic module on the device can be ensured; by setting all the outermost cell pieces among the edge cell pieces as photovoltaic cells, the improvement effect of the photovoltaic cells on grid breakage during processing can be ensured.
[0063] In a feasible embodiment, the above-mentioned photovoltaic module may specifically include a plurality of cell pieces arranged in an array; the cell pieces include middle cell pieces and edge cell pieces, and the outermost cell pieces among the edge cell pieces are photovoltaic cells as described above; the photovoltaic cell includes:
[0064] A cell piece main body, a plurality of first fine grids located on the first surface of the cell piece main body, and a plurality of second fine grids intersecting with the first fine grids;
[0065] The first surface of the cell piece main body has a first middle area, first edge areas located on both sides of the first middle area along the extension direction of the second fine grid. Some of the second fine grids in the first edge areas are thickened grid lines, and the remaining second fine grids in the first edge areas are unthickened grid lines. The second fine grids at the first middle area are unthickened grid lines. A plurality of first fine grids and a plurality of second fine grids are arranged on the second surface of the cell piece main body;
[0066] The second surface of the cell piece main body has a second middle area, second edge areas located on both sides of the second middle area along the extension direction of the second fine grid. Some of the second fine grids in the second edge areas are thickened grid lines, and the remaining second fine grids in the second edge areas are unthickened grid lines. The second fine grids at the second middle area are unthickened grid lines;
[0067] The distance between the end of the thickened grid line and the edge of the adjacent cell piece main body is 2 mm to 10 mm. The height of the thickened grid line is the same as that of the unthickened grid line. The width of the thickened grid line is 20 μm to 80 μm, and the width of the unthickened grid line is 10 μm to 50 μm. The width of the thickened grid line is greater than that of the unthickened grid line, and the difference between the width of the thickened grid line and the width of the unthickened grid line is 10 μm;
[0068] The first fine grids are perpendicular to the second fine grids, and all the first fine grids are arranged in parallel. The number of the first fine grids is greater than the number of the second fine grids.
[0069] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.
[0070] In addition, it should be noted that in this text, relationships such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation is intended to cover non-exclusive inclusion.
[0071] The above has introduced in detail a photovoltaic cell and a photovoltaic module provided by the present utility model. Specific examples are used in this text to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the structure and core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.
Claims
1. A photovoltaic cell, comprising: a main body of a cell piece, a plurality of first fine grids located on a first surface of the main body of the cell piece, and a plurality of second fine grids intersecting with the first fine grids, wherein: the first surface of the main body of the cell piece has a first intermediate region and first edge regions located on both sides of the first intermediate region along the extending direction of the second fine grids, at least part of the second fine grids in the first edge regions are thickened grid lines, and the second fine grids in the first intermediate region are unthickened grid lines.
2. The photovoltaic cell according to claim 1, characterized in that, The distance between the end of the thickened grid line and the edge of the adjacent main body of the cell piece is 2 mm to 10 mm.
3. The photovoltaic cell according to claim 1, wherein The height of the thickened grid line is the same as that of the unthickened grid line.
4. The photovoltaic cell according to claim 1, characterized in that The width of the thickened grid line is 20 μm to 80 μm, the width of the unthickened grid line is 10 μm to 50 μm, and the width of the thickened grid line is greater than that of the unthickened grid line.
5. The photovoltaic cell according to claim 1, characterized in that, The difference between the width of the thickened grid line and the width of the unthickened grid line is 8 to 12 μm.
6. The photovoltaic cell according to claim 1, wherein, The first fine grids are perpendicular to the second fine grids; and all the first fine grids are arranged in parallel, and the number of the first fine grids is greater than the number of the second fine grids.
7. The photovoltaic cell according to any one of claims 1 to 6, characterized in that, A plurality of the first fine grids and a plurality of the second fine grids are arranged on a second surface of the main body of the cell piece; the second surface of the main body of the cell piece has a second intermediate region and second edge regions located on both sides of the second intermediate region along the extending direction of the second fine grids, at least part of the second fine grids in the second edge regions are thickened grid lines, and the second fine grids in the second intermediate region are unthickened grid lines.
8. A photovoltaic module, characterized in that, Comprising a plurality of cell pieces arranged in an array; the cell pieces include intermediate cell pieces and edge cell pieces, and at least part of the edge cell pieces are the photovoltaic cells according to any one of claims 1 to 7.
9. The photovoltaic module according to claim 8, wherein, The intermediate cell pieces are main-gridless cell pieces.
10. The photovoltaic module according to claim 8, wherein, All the outermost cell pieces among the edge cell pieces are the photovoltaic cells.