A solar cell, a solar cell module, and a printing plate assembly

Abstract

This application discloses a solar cell (1) comprising multiple sub-grid lines (1b), at least one of the sub-grid lines (1b) comprising multiple sub-grid short lines (12) and multiple connecting components (10). The multiple sub-grid short lines (12) are spaced apart along the length direction of the sub-grid line (1b). Any two adjacent sub-grid short lines (12) on the sub-grid line (1b) are connected by the connecting component (10). The dimension of the connecting component (10) along the length direction of the sub-grid short line (12) is larger than the spacing. The multiple connecting components (10) on different sub-grid lines (1b) are arranged in multiple columns. The connecting component is used to connect with a solder strip. The surface of the connecting component (10) protrudes from the surface of the sub-grid short line (12), so that the solder strip is electrically connected to the sub-grid short line (12) through the connecting component (10). This application also discloses a solar cell module and a printing plate module.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, specifically to a solar cell, a solar cell module, and a printing plate module. Background Technology

[0002] Currently, in the fabrication of solar cell grid electrodes, different metal pastes are used for printing the main grid and the sub-grid. Typically, the metal paste for the main grid has poor molding properties, and there is a height difference between the grid lines at the junction of the short lines of the main and sub-grids. This can easily lead to the grid lines melting and breaking during soldering.

[0003] Therefore, developing novel printing plate pattern structures and solar cell grid line structures, improving the welding strength of the main grid, and avoiding grid line meltdown are urgent problems to be solved in this field. Utility Model Content

[0004] This invention aims to address one of the technical problems in related technologies to a certain extent. Therefore, this invention provides a solar cell, a solar cell module, and a printing plate assembly.

[0005] As a first aspect of this utility model, a solar cell is disclosed, the solar cell comprising multiple sub-grid lines, at least one of the sub-grid lines comprising multiple sub-grid short lines and multiple connecting components, the multiple sub-grid short lines being spaced apart along the length direction of the sub-grid lines, any two adjacent sub-grid short lines on the sub-grid lines being connected by the connecting components, the dimension of the connecting components along the length direction of the sub-grid short lines being greater than the spacing, the multiple connecting components on different sub-grid lines being arranged in multiple columns, the connecting components being used for connection with solder ribbon, the surface of the connecting components protruding from the surface of the sub-grid short lines, such that the solder ribbon is electrically connected to the sub-grid short lines through the connecting components.

[0006] Furthermore, the connecting assembly includes a connecting portion and at least one support grid, the connecting portion being connected to a corresponding sub-grid short line, and the support grid being disposed on the upper surface of the connecting portion.

[0007] Furthermore, the grid lines of the support grid and the sub-grid short line are printed in the same step, the surface of the connecting portion is lower than the surface of the sub-grid short line, and the surface of the support grid is higher than the surface of the sub-grid short line.

[0008] Furthermore, the dimension of the support grid along the length of the sub-grid short line is smaller than the dimension of the connecting portion along the length of the sub-grid short line, and the dimension of the connecting portion along the width of the sub-grid short line is greater than or equal to the width of the sub-grid short line.

[0009] Furthermore, a plurality of support grids are provided between any adjacent sub-gate short lines along the length direction of the sub-gate short lines, and on the connecting portion, the plurality of support grids are spaced apart along the length direction of the sub-gate short lines, and / or

[0010] On the connecting portion, a plurality of the support grids are spaced apart along the width direction of the sub-grid short lines.

[0011] Furthermore, the connecting portion includes a first intermediate portion and two first ends, the two first ends being located at both ends of the first intermediate portion along the length direction of the sub-gate short line, the first ends being connected to the first intermediate portion, at least one end of the sub-gate short line overlapping the corresponding first end, and the dimension of the first end along the width direction of the sub-gate short line being greater than the width of the sub-gate short line.

[0012] Furthermore, the solar cell also includes multiple main grid lines, which are arranged to cross the sub-grid lines. At least one main grid line includes multiple spaced main grid short lines, and a corresponding main grid short line is connected between any two adjacent connecting components along the length direction of the main grid line.

[0013] Furthermore, the width of the sub-gate short line is between 4μm and 50μm, the dimension of the connecting component in the length direction of the sub-gate short line is in the range of 100μm to 2000μm, and the width of the main gate short line is in the range of 20μm to 1000μm.

[0014] As a second aspect of this application, a solar cell module is disclosed, the solar cell module comprising a plurality of solar cells and a plurality of solder strips, characterized in that the solar cells are the aforementioned solar cells, and the plurality of solder strips are soldered together by the connecting assembly.

[0015] As a third aspect of this application, a printing plate assembly is disclosed, the printing plate assembly including a first printing plate and a second printing plate, wherein the first printing plate is provided with a plurality of connection openings arranged at intervals along a first direction, the connection openings being used for printing connection portions;

[0016] The second printing plate is provided with a plurality of sub-grid line openings arranged along a first direction. The sub-grid line openings include a plurality of sub-grid short line openings and at least one support grid opening. The sub-grid short line openings are used to print sub-grid short lines, and the support grid openings are used to print support grids. At least one support grid opening is provided between any two adjacent sub-grid short line openings. There is a gap between the support grid opening and the adjacent sub-grid short line opening. The support grid openings correspond one-to-one with the connecting part openings, so that the connecting part printed through the connecting part openings and the support grid printed through the support grid openings form a connecting assembly.

[0017] The technical solution of this application provides a solar cell with an improved grid structure. By setting connecting components at the intervals of multiple sub-grid lines, it effectively solves the problem that the grid lines in traditional solar cells are easily melted or pulled apart when in contact with the solder strip.

[0018] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram illustrating the overlapping configuration of the main and auxiliary grids in a conventional fully open metal printing plate for related technologies.

[0021] Figure 2 A photomicrograph of the overlapping configuration of the main and secondary grids of a conventional fully open metal printing plate;

[0022] Figure 3 Micrograph of the overlap between the main and secondary grids of a conventional mesh screen;

[0023] Figure 4 Microscopic photograph of a broken weld on a photovoltaic module;

[0024] Figure 5(a) is a schematic diagram of the grid structure of one embodiment of the solar cell provided in this application;

[0025] Figure 5(b) is a schematic diagram of the grid structure of another embodiment of the solar cell provided in this application;

[0026] Figure 6 A cross-sectional schematic diagram of one embodiment of the solar cell provided in this application;

[0027] Figure 7 A schematic diagram of the grid structure of one embodiment of the solar cell provided in this application;

[0028] Figure 8 A schematic diagram of the grid structure of one embodiment of the solar cell provided in this application;

[0029] Figure 9 A schematic diagram of the grid structure of one embodiment of the solar cell provided in this application;

[0030] Figure 10 A schematic diagram of the grid structure of one embodiment of the solar cell provided in this application;

[0031] Figure 11 A schematic diagram of the grid structure of one embodiment of the solar cell provided in this application;

[0032] Figure 12 A schematic diagram of the first printing plate in the printing plate assembly provided in this application;

[0033] Figure 13 This is a schematic diagram of the second printing plate in the printing plate assembly provided in this application.

[0034] Explanation of reference numerals in the attached figures

[0035] 1: Solar cell; 1a: Main busbar; 1b: Sub-busbar; 10: Connecting module;

[0036] 10a: Connecting part; 10b: Support grid; 11: Main grid short line; 12: Sub-grid short line; 13: Welding strip;

[0037] 101: First end portion; 102: First intermediate portion;

[0038] 2a: First printing plate; 2b: Second printing plate;

[0039] 20a: First outer frame; 21a: First mesh fabric; 22a: First organic film; 23a: First metal film; 231: Connection opening;

[0040] 20b: Second outer frame; 21b: Second mesh fabric; 22b: Second organic film; 23b: Second metal film; 232: Sub-grid short line opening; 233: Support grid opening; Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0042] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0043] The inventors of this application have discovered that in the design of a metal printing plate for a fully open structure of a solar cell, the original overlapping form of the main grid and sub-grid is as follows: Figure 1 and Figure 2 As shown, the main grid lines are printed first and then dried. Then, the sub-grid short lines 12 are printed onto the corresponding positions of the sub-grids using a fully open sub-grid printing plate with an overlapping structure. Connecting grids extending from both sides are added to the main grid. These connecting grids can have different shapes. To increase the tolerance for overlap offset, T-shaped structures can be added to both ends of the connecting grids, such as... Figure 2 As shown. In conventional screen printing, the sub-grid short line 12 has no break at the main grid line position and spans the main grid line, as shown... Figure 3 As shown, the structure at the connecting gate is integrated with the short line of the sub-gate, and the gate line width at the connecting gate is greater than the gate line width of the short line of the sub-gate, thereby avoiding the gate breakage problem.

[0044] In the printing process using the two types of printing plates mentioned above, the main grid line paste typically has good fluidity and low viscosity, resulting in poor plasticity. Therefore, the height of the printed and sintered main grid lines is usually less than 5 micrometers, generally less than 3.5 micrometers. In contrast, the viscosity of the secondary grid line paste is higher than that of the main grid line paste, and the height of the printed and sintered secondary grid lines is generally between 7 and 12 micrometers. When using printing plates that reflect these paste characteristics, since the secondary grid lines formed by conventional screen printing span the main grid lines, and the connecting grids on both sides of the main grid are formed by the secondary grid printing, the overall grid line height of the connecting grids and the secondary grid lines is generally greater than 7 micrometers. During component string bonding, the solder on the solder strips will not cause the connecting grids to break.

[0045] However, when printing sub-grid short lines and main grid lines using a fully open printing plate, the sub-grid short lines are disconnected on the main grid lines, such as... Figure 1 and Figure 4 As shown, the welding position of the solder strip 13 is the position of the main grid and the connecting grid where the grid line height is low. Since the grid line height of the connecting grid and the main grid line is low and the wet weight of the paste is small, the welding process will cause the connecting grid to melt, which will result in poor collection of module current.

[0046] Based on the above problems, as the first aspect of this application, a solar cell 1 is disclosed, such as... Figures 5(a) to 11As shown, the solar cell 1 includes multiple sub-grid lines 1b, at least one sub-grid line 1b includes multiple sub-grid short lines 12 and multiple connecting components 10. The multiple sub-grid short lines 12 are spaced apart along the length direction of the sub-grid line 1b. Connecting components 10 connect any two adjacent sub-grid short lines 12 on the sub-grid line 1b. The dimension of the connecting components 10 along the length direction of the sub-grid short lines 12 is greater than the spacing. Multiple connecting components 10 on different sub-grid lines 1b are arranged in multiple columns. The connecting components are used to connect with the solder ribbon. The surface of the connecting component 10 protrudes from the surface of the sub-grid short lines 12, so that the solder ribbon is electrically connected to the sub-grid short lines 12 through the connecting components 10.

[0047] As another embodiment of the solar cell of this application, such as Figures 5(b) to 11 As shown, the solar cell 1 includes multiple main grid lines 1a and multiple sub-grid lines 1b arranged in a cross configuration. The solar cell 1 also includes multiple connecting components 10, which are respectively disposed at the intersections formed by the multiple main grid lines 1a and the multiple sub-grid lines 1b. The main grid line 1a includes multiple main grid short lines 11. A corresponding main grid short line 11 is connected between any two adjacent connecting components 10 along the length direction of the main grid line 1a. The dimension of the connecting component 10 extending along the length direction of the sub-grid line 1b is greater than the width of the main grid short line 11.

[0048] The sub-grid line 1b includes multiple spaced sub-grid short lines 12. These sub-grid short lines 12 are connected to the main grid short lines 11 via corresponding connecting components 10. The surface of the connecting component 10 protrudes beyond the surface of the main grid short lines 11, allowing the solder strip to be welded to the main grid short lines 11 via the connecting component 10. Conversely, the protrusion of the connecting component 10 prevents the solder strip from contacting the main grid short lines 11. The main grid short lines 11 have poor sizing properties and low grid height. The connecting component 10 effectively raises the welding position between the main grid short lines 11 and the solder strip, indirectly increasing the height of the solder strip. The high temperature of the solder strip prevents further contact with the sub-grid and part of the main grid short lines 11, thus preventing the grid lines from melting. Preferably, the connecting component 10 serves as the welding point for welding the solder strip, and the width of the connecting component 10 relative to the main and sub-grid directions is wider than the grid line width, providing a more stable welding platform for the solder strip, making the weld more stable and less prone to breakage.

[0049] The width of the solder strip is typically greater than the width of the main grid short line 11. To prevent the thin, tall secondary grid short line 12 from contacting the solder strip, this application provides a connecting component 10. The connecting component 10 extends along the length direction of the secondary grid line 1b by a dimension greater than the width of the main grid short line 11, preferably matching the width of the solder strip. This avoids the problem of the secondary grid short line 12 directly contacting the solder strip and causing grid breakage. The secondary grid short line 12 and the main grid short line 11 can be transitionally connected through the corresponding connecting component 10. Furthermore, dividing the main grid line into multiple main grid short lines 11 and the secondary grid line 1b into multiple secondary grid short lines 12 can shorten the printing distance and time, thereby reducing the deformation of the printing plate opening due to printing pressure caused by the long printing distance, resulting in better printing uniformity of the main grid short line 11 and the secondary grid short line 12.

[0050] This application does not impose any special limitations on the specific form of the connecting component 10, as long as the surface of the connecting component 10 protrudes beyond the surface of the main gate short line 11. For example, it can be formed in one step. In some embodiments, the connecting component 10 includes a connecting portion 10a and at least one support gate 10b. The connecting portion 10a is connected to the corresponding main gate short line 11 or the corresponding secondary gate short line 12, and the support gate 10b is disposed on the upper surface of the connecting portion 10a. By dividing the connecting component 10 into upper and lower parts, the gate line of the connecting component 10 is heightened. This configuration is also suitable for the current printing method of printing the main and secondary gates in stages. For example, the connecting portion 10a can be printed simultaneously with the main gate, making the gate line height of the main gate short line 11 consistent with that of the connecting portion 10a. During the printing of the secondary gate, the support gate 10b is printed again at the corresponding position of the connecting portion 10a, making the gate line height of the support gate 10b consistent with that of the secondary gate short line 12. Thus, the surface position of the connecting component 10 is increased by printing it twice. Preferably, the gate line height of the support gate 10b is between 5μm and 15μm, which is consistent with the height of the sub-gate short line 12, and the gate line height of the connecting part 10a is not higher than 5μm, which is consistent with the height of the main gate short line 11.

[0051] In some embodiments, the gate lines of the support gate 10b and the sub-gate short line 12 are obtained by printing in the same step, the surface of the connecting portion 10a is lower than the surface of the sub-gate short line 12, and the surface of the support gate 10b is higher than the surface of the sub-gate short line 12.

[0052] In one optional implementation, the dimension of the support grid 10b along the length of the sub-grid short line 12 is smaller than the dimension of the connecting portion 10a along the length of the sub-grid short line 12, while the dimension of the connecting portion 10a along the width of the sub-grid short line 12 is greater than or equal to the width of the sub-grid short line 12. This reduces the paste consumption of the support grid while providing sufficient contact area to support the solder strip and prevent it from deforming and collapsing. Furthermore, the intermittent structure between the support grid and the sub-grid short line provides sufficient lateral support for the printing plate, preventing plate deformation that could widen the width of both the sub-grid short line and the support grid.

[0053] In other embodiments, the support gate 10b is wider than the main gate short line 11, so that the solder strip is raised by the wider support gate 10b, and even if there is a downwardly deformed portion, it will not contact the main gate short line 11. Preferably, the dimension of the support gate 10b in the width direction along the main gate short line 11 is between 20 μm and 500 μm, and the dimension of the support gate 10b in the length direction along the sub-gate short line 12 is between 5 μm and 100 μm.

[0054] This application does not impose any special limitations on the number and shape of the support grids 10b within a connecting component 10. For example, the shape of the support grids 10b on the surface of the solar cell 1 includes at least one of rectangles, circles, triangles, and trapezoids, such as... Figure 10 As shown; in other embodiments, multiple support grids 10b are provided between any adjacent sub-gate short lines 12 along the length direction of the sub-gate short line 12, such as... Figure 8 and Figure 9 As shown, on the connecting part 10a, a plurality of support grids 10b are spaced apart along the length direction of the sub-grid short line 12, and / or a plurality of support grids 10b are spaced apart along the width direction of the sub-grid short line 12, which can provide more welding strip support points, thereby strengthening the welding firmness.

[0055] This application does not impose special limitations on the bottom surface shape of the connecting component 10, as long as it satisfies the requirement of transitional connection between the sub-gate short line 12 and the connecting portion. In some embodiments, such as Figure 11 As shown, at least one end of the sub-gate short line 12 overlaps the surface of the connecting component 10. The dimension of the connecting component 10 at the overlap point of the sub-gate short line 12 along the width direction of the sub-gate short line 12 is larger than the width of the sub-gate short line 12, making it easier to align the sub-gate short line 12 with the connecting component 10. In other embodiments, from the main gate short line 11 to the sub-gate short line 12, the dimension of the connecting component 10 decreases along the width direction of the sub-gate line 1b. This shape can reduce the shading area of ​​the connecting component 10 on the solar cell 1, increasing light absorption and conversion efficiency.

[0056] In some other specific embodiments, the connecting portion 10a includes a first intermediate portion 102 and two first end portions 101. The two first end portions 101 are respectively located at both ends of the first intermediate portion 102 along the length direction of the sub-gate short line 12. The first end portions 101 are connected to the first intermediate portion 102. At least one end of the sub-gate short line 12 overlaps on the corresponding first end portion 101. The dimension of the first end portion 101 along the width direction of the sub-gate short line 12 is larger than the width of the sub-gate short line 12, which improves the overlap tolerance of the sub-gate short line and facilitates the overlap of the sub-gate short line.

[0057] As an optional implementation, the maximum dimension of the first intermediate portion 102 along the width direction of the sub-grid short line 12 is greater than the dimension of the first end portion 101 along the width direction of the sub-grid short line 12. Since the first intermediate portion is the middle part of the connecting assembly, it needs to have a large contact area with the battery cell. However, in order to reduce the area of ​​the connecting portion obstructing the battery cell, while ensuring good overlap between the first end portion and the sub-grid short line, a method such as... Figure 11 The end shown is a T-shaped connector, but a shuttle-shaped connector can also be used.

[0058] In other embodiments, the solar cell 1 further includes multiple main grid lines 1a, which are arranged to cross each other with sub-grid lines 1b. At least one main grid line 1a includes multiple spaced main grid short lines 11, and a corresponding main grid short line 11 is connected between any two adjacent connecting components 10 along the length direction of the main grid line 1a.

[0059] The grid structure of this application is applicable to solar cell grids of any size range. Preferably, the width of the sub-grid short line is between 4 μm and 50 μm, the dimension of the connecting component 10 in the length direction of the sub-grid short line 12 is in the range of 100 μm to 2000 μm, and the width of the main grid short line is in the range of 20 μm to 1000 μm.

[0060] As a second aspect of this application, a solar cell module is disclosed, which includes a plurality of solar cells 1 and a plurality of solder strips, wherein the solar cells 1 are the aforementioned solar cells 1, and the plurality of solder strips are soldered together by a connecting component 10.

[0061] As a third aspect of this application, a printing plate component is disclosed, such as Figure 12 and Figure 13 As shown, the printing plate assembly includes a first printing plate 2a and a second printing plate 2b. The first printing plate 2a is provided with a plurality of connection openings 231 arranged at intervals along a first direction. The connection openings 231 are used for printing connection parts.

[0062] The second printing plate 2b is provided with at least one sub-grid line opening arranged along the first direction. The sub-grid line opening includes multiple sub-grid short line openings 232 and at least one support grid opening 233. The sub-grid short line openings 232 are used to print sub-grid short lines, and the support grid openings 233 are used to print support grids. At least one support grid opening 233 is provided between any two adjacent sub-grid short line openings 232. There is a gap between the support grid opening 233 and the adjacent sub-grid short line opening 232. The support grid openings 233 correspond one-to-one with the connecting portion openings 231, so that the connecting portion printed through the connecting portion openings 231 and the support grid printed through the support grid openings 233 form a connecting assembly.

[0063] This application does not impose any special limitation on the type of the first printing plate 2a; it can be a screen with an open mesh or a fully open metal film screen. The second printing plate 2b of this application is preferably a fully open metal film screen, because metal film screens have good material permeability, are not easily clogged, and meet the requirements of the spaced sub-grid short lines structure of the solar cell 1 structure of this application.

[0064] In some embodiments, the first printing plate 2a includes a first outer frame 20a, a first mesh fabric 21a, a first organic film 22a and a first metal film 23a. The first organic film 22a is stacked on the lower surface of the first metal film 23a. The first organic film 22a and the first metal film 23a are fixedly connected to the first outer frame 20a by setting the tension of the first mesh fabric 21a.

[0065] In some embodiments, the second printing plate 2b includes a second outer frame 20b, a second mesh fabric 21b, a second organic film 22b, and a second metal film 23b. The second organic film 22b is stacked on the lower surface of the second metal film 23b. The second organic film 22b and the second metal film 23b are fixedly connected to the second outer frame 20b by setting tension through the second mesh fabric 21b.

[0066] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A solar cell, characterized in that, The solar cell (1) includes multiple sub-grid lines (1b), at least one of the sub-grid lines (1b) includes multiple sub-grid short lines (12) and multiple connecting components (10). The multiple sub-grid short lines (12) are spaced apart along the length direction of the sub-grid line (1b). The connecting component (10) connects any two adjacent sub-grid short lines (12) on the sub-grid line (1b). The dimension of the connecting component (10) along the length direction of the sub-grid short line (12) is larger than the spacing. The multiple connecting components (10) on different sub-grid lines (1b) are arranged in multiple columns. The connecting component is used to connect with the solder strip. The surface of the connecting component (10) protrudes from the surface of the sub-grid short line (12), so that the solder strip is electrically connected to the sub-grid short line (12) through the connecting component (10).

2. The solar cell according to claim 1, characterized in that, The connecting assembly (10) includes a connecting portion (10a) and at least one support grid (10b), the connecting portion (10a) being connected to a corresponding sub-grid short line (12), and the support grid (10b) being disposed on the upper surface of the connecting portion (10a).

3. The solar cell according to claim 2, characterized in that, The support gate (10b) and the gate lines of the sub-gate short line (12) are printed in the same step. The surface of the connecting part (10a) is lower than the surface of the sub-gate short line (12), and the surface of the support gate (10b) is higher than the surface of the sub-gate short line (12).

4. The solar cell according to claim 2, characterized in that, The dimension of the support grid (10b) along the length direction of the sub-grid short line (12) is smaller than the dimension of the connecting portion (10a) along the length direction of the sub-grid short line (12), and the dimension of the connecting portion (10a) along the width direction of the sub-grid short line (12) is greater than or equal to the width of the sub-grid short line (12).

5. The solar cell according to claim 4, characterized in that, Along the length direction of the sub-gate short line (12), a plurality of support grids (10b) are provided between any two adjacent sub-gate short lines (12). On the connecting portion (10a), the plurality of support grids (10b) are spaced apart along the length direction of the sub-gate short line (12), and / or On the connecting portion (10a), a plurality of the support grids (10b) are spaced apart along the width direction of the sub-grid short line (12).

6. The solar cell according to claim 2, characterized in that, The connecting portion (10a) includes a first intermediate portion (102) and two first end portions (101). The two first end portions (101) are located at both ends of the first intermediate portion (102) along the length direction of the sub-gate short line (12). The first end portions (101) are connected to the first intermediate portion (102). At least one end of the sub-gate short line (12) overlaps the corresponding first end portion (101). The dimension of the first end portion (101) along the width direction of the sub-gate short line (12) is greater than the width of the sub-gate short line (12).

7. The solar cell according to any one of claims 1 to 6, characterized in that, The solar cell (1) also includes multiple main grid lines (1a), which are intersected with the sub-grid lines (1b). At least one main grid line (1a) includes multiple spaced main grid short lines (11), and a corresponding main grid short line (11) is connected between any two adjacent connecting components (10) along the length direction of the main grid line (1a).

8. The solar cell according to claim 7, characterized in that, The width of the sub-gate short line (12) is between 4 μm and 50 μm, the dimension of the connecting component (10) in the length direction of the sub-gate short line (12) is in the range of 100 μm to 2000 μm, and the width of the main gate short line (11) is in the range of 20 μm to 1000 μm.

9. A solar cell module, the solar cell module comprising a plurality of solar cells and a plurality of solder strips, characterized in that, The solar cell is a solar cell (1) as described in any one of claims 1 to 8, and the plurality of the welding strips are welded together by the connecting assembly (10).

10. A printing plate assembly, characterized in that, The printing plate assembly includes a first printing plate and a second printing plate. The first printing plate is provided with a plurality of connection openings arranged at intervals along a first direction. The connection openings are used for printing connection parts. The second printing plate is provided with at least one sub-grid line opening arranged along a first direction. The sub-grid line opening includes multiple sub-grid short line openings and at least one support grid opening. The sub-grid short line openings are used to print sub-grid short lines, and the support grid openings are used to print support grids. At least one support grid opening is provided between any two adjacent sub-grid short line openings. There is a gap between the support grid opening and the adjacent sub-grid short line opening. The support grid openings correspond one-to-one with the connecting portion openings, so that the connecting portion printed through the connecting portion openings and the support grid printed through the support grid openings form a connecting assembly.

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