Novel efficient silicon-based battery main-grid-free full-opening screen printing plate
By using the first and second screens made of steel sheets in the manufacturing of silicon-based batteries, hollow holes with fully open structures are set up, and the problem of deformation of grid lines in the main gate design is solved, and printing efficiency and quality are improved.
Patent Information
- Application Number
- CN202422140083.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-02
AI Technical Summary
When designing without a main grid, the opening of the screen panel is too large, resulting in the hollow pattern of the grid line without support. The position of the grid line is easily deformed during printing, affecting the printing quality.
The first screen and the second screen are used, both of which are made of steel plates, and the first hollow position and the second hollow position are set. Combined with the screen printing pattern, the hollow hole in the gate line is made into a fully open structure, increasing the length of the hollow hole in the gate line to provide support and avoid deformation.
Improve printing efficiency, ensure the quality of grid lines, extend the service life of the screen, and avoid insufficient tension during printing.
Smart Images
Figure CN223224044U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of silicon-based battery manufacturing, in particular to a novel high-efficiency silicon-based battery main grid-free full-opening screen. Background Art
[0002] In the manufacturing process of crystalline silicon cells, screen printing is the most widely used method for preparing electrodes during mass production. Typically, the front grid lines of a solar cell consist of at least one main grid line and several secondary grid lines connected to the main grid line. The secondary grid lines guide the current generated by the photovoltaic effect of the semiconductor material, while the main grid lines collect the current from the secondary grid lines and transmit it through the soldered ribbons connected to them. The main grid lines and secondary grid lines are formed by screen printing expensive conductive silver paste onto the solar cell.
[0003] With the increasing demand for cost reduction and efficiency improvement, layout design is gradually shifting to busbar-less designs. As a new battery packaging technology, busbar-less cells directly use solder ribbons instead of busbars to collect current from each secondary busbar, eliminating the need for busbar printing and reducing the material cost of printing silver paste.
[0004] However, when there is no main grid design, the holes at the hollow position of the screen are too large, resulting in a lack of support for the grid line hollow pattern. During printing, the grid line position is easily deformed, resulting in thickened printed grid lines, which affects the printing quality. Utility Model Content
[0005] The utility model provides a new type of high-efficiency silicon-based battery full-opening screen without a main grid, which is used to solve the technical problem that the holes at the hollow positions of the screen are too large in the current design without a main grid, resulting in a hollow grid line pattern without support, and the grid line position is easily deformed during printing, resulting in thickened printed grid lines, which affects the printing quality.
[0006] In order to solve the above technical problems, the utility model discloses a new type of high-efficiency silicon-based battery main grid-free fully open screen, including: a first screen and a second screen, the first screen and the second screen are both made of steel plates, a first hollow position is set on the first screen, and a second hollow position is set on the second screen, the first hollow position and the second hollow position are combined to form a screen printing pattern, and the grid line hollow holes of the screen printing pattern are a fully open structure.
[0007] Preferably, the first hollow position of the first screen is complementary to the second hollow position of the second screen.
[0008] Preferably, the first hollow position includes several rows of first fine grid groups distributed at intervals according to the welding strip connection position, the first fine grid group includes two rows of first fine grid rows, the first fine grid row includes several first fine grid segments, several first fine grid segments in the same row are distributed at intervals according to the welding strip connection position, and the first fine grid segments in adjacent rows are staggered, the second hollow position includes several rows of second fine grid groups distributed at intervals according to the welding strip connection position, the second fine grid group includes two rows of second fine grid rows, the second fine grid row includes several second fine grid segments, the left and right ends of the second fine grid segment correspond to the ends of the two adjacent first fine grid segments respectively, and the connection between the end of the second fine grid segment and the end of the first fine grid segment is the welding strip connection position.
[0009] Preferably, thickened sections are provided at both ends of the first thin gate segment, the thickened sections are of a gradually thickened structure, and the width of the thickened section close to the first thin gate segment is smaller than the width of the end away from the first thin gate segment.
[0010] Preferably, the hollowed-out position of the edge of the screen-printed pattern perpendicular to the printing direction is partially opened.
[0011] Preferably, the first screen contacting the battery cell is covered with a first flexible film, the hollow position of the first flexible film is consistent with the first hollow position, and the second screen contacting the battery cell is covered with a second flexible film, the hollow position of the second flexible film is consistent with the second hollow position.
[0012] Preferably, a plurality of first positioning points are set on the first screen, and a plurality of second positioning points are set on the second screen, and the second positioning points correspond to the first positioning points.
[0013] Preferably, the first hollow position includes several first frame segments, the first frame segment is located at the edge of the first screen, and the first frame segment is connected to the ends of several first fine grid segments. The second hollow position includes several second frame segments, the second frame segment is located at the edge of the second screen, and the second frame segment is connected to the ends of several second fine grid segments. The first frame segment and the second frame segment are both in the shape of a broken line, and the first frame segment and the second frame segment adopt a non-fully open design.
[0014] The technical solution of the present invention has the following advantages: The present invention provides a new type of high-efficiency silicon-based battery busbar-free fully-opened screen, which relates to the field of silicon-based battery manufacturing technology, including a first screen and a second screen, both of which are made of steel plates, a first hollow position is set on the first screen, and a second hollow position is set on the second screen, and the first hollow position and the second hollow position are combined to form a screen printing pattern, and the grid line hollow holes of the screen printing pattern are a fully-open structure. In the present invention, by combining the first hollow position and the second hollow position, the grid line hollow holes are made into a fully-open structure, while maintaining the width of the grid line hollow holes, the length of the grid line hollow holes is increased, the screen opening is enlarged, the printing line shape is improved, and thus the printing efficiency is improved.
[0015] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the devices particularly pointed out in the written description and the drawings.
[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0018] Figure 1 A schematic diagram of a screen printing pattern used in combination with the first screen and the second screen in the present invention;
[0019] Figure 2 Schematic diagram of the first screen in the present utility model;
[0020] Figure 3 Schematic diagram of the second screen in the present utility model;
[0021] Figure 4 It is a schematic diagram of the harpoon structure in the utility model.
[0022] In the figure: 1. First screen; 2. Second screen; 3. Screen-printed pattern; 4. First fine grid segment; 5. Second fine grid segment; 6. Bold segment; 7. First positioning point; 8. Second positioning point; 9. First frame segment; 10. Second frame segment; 11. Fine grid body; 12. Frame body; 13. Harpoon structure; 14. Non-hollow area. DETAILED DESCRIPTION
[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.
[0024] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0025] Example 1
[0026] The embodiment of the utility model provides a new type of high-efficiency silicon-based battery without main grid full-opening screen, such as Figure 1-Figure 4 As shown, it includes: a first screen 1 and a second screen 2, both of which are made of steel plates, a first hollow position is set on the first screen 1, and a second hollow position is set on the second screen 2, the first hollow position and the second hollow position are combined to form a screen printing pattern 3, and the grid line hollow holes of the screen printing pattern 3 are a fully open structure.
[0027] The working principle and beneficial effects of the above technical solution are as follows: the first screen 1 and the second screen 2 are both made of steel plates, which are not easily deformed, provide support for the grid line hollow holes, increase the service life of the first screen 1 and the second screen 2, and solve the problem of easy deformation of the grid line during printing. In addition, by combining the first hollow position and the second hollow position, a screen printing pattern 3 is formed, such as Figure 1 As shown, it is a schematic diagram of the printing effect with 20 welding strips and 54 secondary grids on the front as an example, which ensures that the printed pattern is a pattern without main grid. Through the combination of the first screen 1 and the second screen 2, the grid line hollow holes are made into a fully open structure. While maintaining the width of the grid line hollow holes, the length of the grid line hollow holes is increased, which not only ensures the tension of the fully open screen, but also increases the screen opening, effectively improving the printing line type, thereby improving the printing efficiency.
[0028] Example 2
[0029] On the basis of the above embodiment 1, Figure 1-Figure 4 As shown, the first hollow position of the first screen 1 is complementary to the second hollow position of the second screen 2;
[0030] The first hollow position includes several rows of first fine grid groups spaced according to the welding strip connection position, the first fine grid group includes two rows of first fine grid rows, the first fine grid row includes several first fine grid segments 4, the several first fine grid segments 4 in the same row are spaced according to the welding strip connection position, and the first fine grid segments 4 in adjacent rows are staggered, the second hollow position includes several rows of second fine grid groups spaced according to the welding strip connection position, the second fine grid group includes two rows of second fine grid rows, the second fine grid row includes several second fine grid segments 5, the left and right ends of the second fine grid segment 5 respectively correspond to the ends of two adjacent first fine grid segments 4, and the connection point between the second fine grid segment 5 and the end of the first fine grid segment 4 is the welding strip connection position;
[0031] Thickened sections 6 are provided at both ends of the first thin gate segment 4 . The thickened sections 6 are of a gradually thickened structure. The width of the thickened section 6 at one end close to the first thin gate segment 4 is smaller than the width at the other end away from the first thin gate segment 4 .
[0032] The working principle and beneficial effects of the above technical solution are as follows: the first hollow position of the first screen 1 is complementary to the second hollow position of the second screen 2, thereby forming a screen printing pattern 3, and the screen printing pattern 3 is a main grid-free printing pattern. When making the first screen 1 and the second screen 2, the entire fine grid body 11 is first split into multiple sections with the component welding strip position as the splitting point, and each of them can be placed on different screens, thereby forming a first fine grid group on the first screen 1 and a second fine grid group on the second screen 2. When printing, a secondary printing process is adopted, and any screen is selected first. Perform the first printing, and then select another screen for the second printing. After the printing is completed, the first fine grid group and the second fine grid group are combined to form the entire fine grid body 11. Through the above scheme, the problem of insufficient tension of the full-opening screen caused by the design without a main grid can be avoided. The second fine grid segment 5 is a non-gradient fine grid, and the width of the second fine grid segment 5 is consistent. Thickened sections 6 are set at both ends of the first fine grid segment 4, and the second fine grid segment 5 is connected to the thickened section 6 of the first fine grid segment 4. By setting the thickened section 6, it is ensured that the printed graphics overlap with each other, thereby ensuring the effective transmission area.
[0033] Example 3
[0034] On the basis of Example 1 or 2, as Figure 1-Figure 4 As shown, the hollowed-out position at the edge of the screen-printed pattern 3 perpendicular to the printing direction is partially opened.
[0035] The working principle and beneficial effects of the above technical solution are as follows: the hollow position at the edge of the screen-printed pattern 3 perpendicular to the printing direction includes a first fine grid segment 4 at the edge of the first screen 1 and a second fine grid segment 5 at the edge of the second screen 2. By setting local openings, the tension of the full-opening screen can be ensured.
[0036] Example 4
[0037] Based on any one of Examples 1-3, the contact surface of the first screen 1 with the battery cell is covered with a first flexible film, and the hollow position of the first flexible film is consistent with the first hollow position; the contact surface of the second screen 2 with the battery cell is covered with a second flexible film, and the hollow position of the second flexible film is consistent with the second hollow position.
[0038] The working principle and beneficial effects of the above technical solution are as follows: the first flexible film and the second flexible film are made of PI, emulsion or other existing materials for preparing flexible films. By setting the first flexible film and the second flexible film, it is possible to avoid an increase in the proportion of defects such as fragments and scratches caused by excessive mechanical strength on the contact surface between the first screen 1, the second screen 2 and the battery cell, thereby improving the printing qualification rate.
[0039] Example 5
[0040] On the basis of any one of Examples 1-4, Figure 1-Figure 3 As shown, a plurality of first positioning points 7 are set on the first screen 1 , and a plurality of second positioning points 8 are set on the second screen 2 , and the second positioning points 8 correspond to the first positioning points 7 .
[0041] The working principle and beneficial effects of the above technical solution are as follows: the first positioning point 7 and the second positioning point 8 are both circular points, and the first screen 1 and the second screen 2 use circular points in the same position, which can ensure accurate positioning of the machine and improve printing quality.
[0042] Example 6
[0043] On the basis of any one of Examples 1-5, Figure 1-Figure 4 As shown, the first hollow position includes several first frame segments 9, the first frame segment 9 is located at the edge of the first screen 1, and the first frame segment 9 is connected to the end of several first fine grid segments 4, the second hollow position includes several second frame segments 10, the second frame segment 10 is located at the edge of the second screen 2, and the second frame segment 10 is connected to the end of several second fine grid segments 5, the first frame segment 9 and the second frame segment 10 are both in the shape of a broken line, and the first frame segment 9 and the second frame segment 10 adopt a non-fully open design.
[0044] The working principle and beneficial effects of the above technical solution are as follows: the first frame segment 9 and the second frame segment 10 are combined to form a frame body 12 of the printed graphic, and the frame body 12 includes a longitudinal frame and a harpoon structure 13, such as Figure 1 As shown, the left and right sides of the fine grid body 11 are longitudinal frames, and the harpoon structure 13 intersects with the upper and lower fine grid bodies 11. Figure 4 As shown, a non-hollow area 14 is formed between the harpoon structure 13 and the fine grid body 11, the first frame segment 9 and the second frame segment 10 are both in the shape of a broken line, and the first frame segment 9 and the second frame segment 10 adopt a non-fully open design, which can ensure the integrity of the printed graphics.
[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.
[0046] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0047] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.
Claims
1. A new type of high-efficiency silicon-based solar cell busbar-free full-opening screen, characterized by: include: The first screen (1) and the second screen (2) are both made of steel plates. A first hollow position is provided on the first screen (1), and a second hollow position is provided on the second screen (2). The first hollow position and the second hollow position are combined to form a screen printing pattern (3). The grid line hollow holes of the screen printing pattern (3) are a fully open structure.
2. The novel high-efficiency silicon-based solar cell busbar-free full-opening screen according to claim 1, characterized in that: The first hollow position of the first screen (1) and the second hollow position of the second screen (2) are complementary.
3. The novel high-efficiency silicon-based solar cell busbar-free full-opening screen according to claim 1, characterized in that: The first hollow position includes a plurality of rows of first fine grid groups spaced according to the welding strip connection position, the first fine grid group includes two rows of first fine grid rows, the first fine grid row includes a plurality of first fine grid segments (4), the plurality of first fine grid segments (4) in the same row are spaced according to the welding strip connection position, and the first fine grid segments (4) in adjacent rows are staggered, the second hollow position includes a plurality of rows of second fine grid groups spaced according to the welding strip connection position, the second fine grid group includes two rows of second fine grid rows, the second fine grid row includes a plurality of second fine grid segments (5), the left and right ends of the second fine grid segments (5) respectively correspond to the ends of the two adjacent first fine grid segments (4), and the connection point between the second fine grid segment (5) and the end of the first fine grid segment (4) is the welding strip connection position.
4. The novel high-efficiency silicon-based solar cell busbar-free full-opening screen according to claim 3 is characterized in that: Thickened sections (6) are provided at both ends of the first thin grating section (4); the thickened sections (6) are of a gradually thickened structure; the width of the thickened section (6) at one end close to the first thin grating section (4) is smaller than the width at one end away from the first thin grating section (4).
5. The novel high-efficiency silicon-based solar cell busbar-free full-opening screen according to claim 1, characterized in that: The edge of the screen printing pattern (3) is partially opened at a hollow position perpendicular to the printing direction.
6. The novel high-efficiency silicon-based solar cell busbar-free fully-opened screen according to claim 1, characterized in that: The first screen (1) is covered with a first flexible film on the contact surface with the battery cell, and the hollow position of the first flexible film is consistent with the first hollow position; the second screen (2) is covered with a second flexible film on the contact surface with the battery cell, and the hollow position of the second flexible film is consistent with the second hollow position.
7. The novel high-efficiency silicon-based solar cell busbar-free fully-opened screen according to claim 1, characterized in that: A plurality of first positioning points (7) are arranged on the first screen (1), and a plurality of second positioning points (8) are arranged on the second screen (2), wherein the second positioning points (8) correspond to the first positioning points (7).
8. The novel high-efficiency silicon-based solar cell busbar-free fully-opened screen according to claim 1, characterized in that: The first hollow position includes a plurality of first frame segments (9), the first frame segments (9) are located at the edge of the first screen (1), and the first frame segments (9) are connected to the ends of the plurality of first fine grid segments (4); the second hollow position includes a plurality of second frame segments (10), the second frame segments (10) are located at the edge of the second screen (2), and the second frame segments (10) are connected to the ends of the plurality of second fine grid segments (5); the first frame segments (9) and the second frame segments (10) are both in a broken line shape, and the first frame segments (9) and the second frame segments (10) adopt a non-fully open design.