Printing plate assembly
By using multiple hollow pattern combinations of printing plate components in the solar cell electrode gate line printing technology, the problem of fine electrode gate line preparation is solved, efficient and low-cost fine gate line printing is achieved, and the conversion efficiency of solar cells is improved.
Patent Information
- Application Number
- CN202421612745.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-07-08
AI Technical Summary
In the existing solar cell electrode gate line printing technology, it is difficult to achieve the preparation of fine electrode gate line and the cost is high. How to further refine the gate line printing width and reduce production costs have become an urgent problem.
Using a printing plate assembly, including a first printing plate and a second printing plate, the printing of the fine grid lines is realized by combining a plurality of first hollow patterns of the first printing plate and a plurality of second hollow patterns of the second printing plate. The first printing plate solves the problems of insufficient strength and stability caused by the high opening rate design of the second printing plate. The double design of the second printing plate with narrow line segments and high opening rate realizes fine grid line printing.
Through this technical means, the fine printing of solar cell electrode gate lines is realized, the photoelectric conversion efficiency of solar cells is improved, and the cost of metal silver paste used when preparing gate lines is reduced.
Smart Images
Figure CN222682014U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar cells, in particular to a printing plate component. Background Art
[0002] In order to improve the photoelectric conversion efficiency and reduce the manufacturing cost of solar cells, the metallization process is an important technical dimension, and how to achieve refined electrode grid lines is a key technical point.
[0003] The existing solar cell electrodes are realized by screen printing. The process is to fix the solar cell on the printing platform, and then use a scraper to print the metal paste on the screen to the surface of the cell to form the electrode grid line. After printing, the cell is placed in a drying and sintering device for curing and sintering, so that the metal paste forms a good contact with the cell, completing the preparation of the conductive electrode.
[0004] The current industry uses precision mesh as the core material of the screen printing plate. In the electrode pattern area, the metal slurry passes through the pores of the screen. The specifications of the screen cloth determine the fineness of the electrode grid lines. For example, the smaller the mesh line diameter, the higher the printing accuracy, but the worse the ink flow and the lower the strength of the printing plate; the smaller the mesh number, the better the printing ink flow, but the printing accuracy is reduced. At present, the fine wire diameter and high mesh number precision mesh cloth used in photovoltaics are expensive. How to further refine the grid line printing width and reduce production costs has become an urgent problem to be solved in the field of solar cell manufacturing. Utility Model Content
[0005] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a printing plate assembly, which has the advantages of high printing accuracy and high printing plate strength.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A printing plate assembly, the printing plate assembly comprising a first printing plate and a second printing plate, the first printing plate being formed with a plurality of first hollowed-out patterns, the second printing plate being formed with a second hollowed-out pattern; the plurality of first hollowed-out patterns being arranged in a plurality of rows and columns, the plurality of second hollowed-out patterns being arranged in a plurality of rows and columns, and the row direction of the first hollowed-out patterns being consistent with the row direction of the second hollowed-out patterns, and the column direction of the first hollowed-out patterns being consistent with the column direction of the second hollowed-out patterns;
[0008] In the same row, the distance between two adjacent first hollow patterns is not greater than the size of the second hollow pattern in the corresponding row along the row direction, and the size of the first hollow pattern along the column direction is greater than the size of the second hollow pattern along the column direction.
[0009] Optionally, the first hollow pattern includes a short hollow pattern and a long hollow pattern; a plurality of the short hollow patterns and a plurality of the long hollow patterns are spaced apart on the first printing plate along the row direction, and the spacing between adjacent short hollow patterns and the long hollow patterns is not greater than the size of the corresponding row of the second hollow patterns along the row direction.
[0010] Optionally, the first printing plate is formed with a plurality of bus line hollow patterns, the plurality of bus line hollow patterns are arranged in a plurality of columns, the column direction of the bus line hollow patterns is consistent with the column direction of the long hollow patterns, and the bus line hollow patterns are connected to the long hollow patterns.
[0011] Optionally, a size of the short hollow pattern along the row direction is 100 microns to 1000 microns, and a size of the short hollow pattern along the column direction is 25 microns to 100 microns.
[0012] Optionally, a size of the long hollow pattern along the row direction is 200 microns to 2000 microns, and a size of the long hollow pattern along the column direction is 50 microns to 1000 microns.
[0013] Optionally, a size of the second hollow pattern along the column direction is 5 microns to 20 microns.
[0014] Optionally, the number of the long hollow patterns along the row direction is 9 to 36, and the number of the long hollow patterns along the column direction is 100 to 200.
[0015] Optionally, both the first printing plate and the second printing plate include a substrate film layer and a frame, and an edge of the substrate film layer is fixed to the frame.
[0016] Optionally, the substrate film layer includes an organic film layer and an alloy film layer, and the organic film layer is bonded to the alloy film layer; the thickness of the organic film layer is 1 micron to 10 microns, and the thickness of the alloy film layer is 8 microns to 30 microns.
[0017] Optionally, a first positioning hole is formed in the edge area of the first printing plate, and a second positioning hole is formed in the edge area of the second printing plate. When the first positioning hole is aligned with the corresponding second positioning hole, the slurry of the first hollow pattern and the second hollow pattern can be printed to form a complete grid line.
[0018] Through the cooperation of the first printing plate and the second printing plate, the first hollow pattern of the first printing plate solves the problem of insufficient plate strength and stability caused by the high aperture ratio design of the second printing plate, and the dual design of the thin and narrow line segments and high aperture ratio of the second printing plate realizes fine grid line printing, thereby further improving the conversion efficiency of solar cells and reducing the cost of using metal silver paste when preparing grid lines.
[0019] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation or means of the utility model will be fully presented in conjunction with the drawings, but it is not a limitation of the technical solution of the utility model. In addition, these features, elements and components appearing in each of the following texts and drawings are multiple, and are marked with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The utility model is further described below in conjunction with the accompanying drawings:
[0021] Figure 1 A schematic structural diagram of a first printing plate according to an embodiment of the utility model;
[0022] Figure 2 A schematic structural diagram of a second printing plate in one embodiment of the utility model;
[0023] Figure 3 is a schematic diagram of the distribution of the first hollowed-out pattern of the first printing plate in the above embodiment;
[0024] Figure 4 A schematic diagram of the distribution of a single row of long hollow patterns and short hollow patterns in the above embodiment;
[0025] Figure 5 is a schematic diagram of the distribution of the second hollowed-out pattern of the second printing plate in the above embodiment;
[0026] Figure 6 is a schematic diagram of the distribution of a single row of second hollowed-out patterns of the second printing plate in the above embodiment;
[0027] Figure 7 A schematic structural diagram of a first printing plate in another embodiment of the utility model;
[0028] Figure 8 A cross-sectional view of a substrate film layer of an embodiment of the utility model;
[0029] Fig. 9 A cross-sectional view of a substrate film layer of another embodiment of the utility model;
[0030] Fig.10 The figure is a schematic diagram of the structure of the grid lines printed by the printing plate assembly according to one embodiment of the utility model.
[0031] Among them, 10, first printing plate; 20, second printing plate; 1, frame; 2, flexible part; 3, substrate film layer; 31, alloy film layer; 32, organic film layer; 40, first hollow pattern; 41, long hollow pattern; 410, first node; 42, short hollow pattern; 420, second node; 43, bus line hollow pattern; 51, second hollow pattern; 510, grid line segment; 52, hollow pattern interval; 6, first positioning hole; 7, second positioning hole. DETAILED DESCRIPTION
[0032] The following is a detailed description of embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.
[0033] References in this specification to "one embodiment" or "an example" or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.
[0034] This embodiment provides a printing plate assembly, which includes a first printing plate 10 and a second printing plate 20, respectively. Figure 1 and Figure 2 As shown, the first printing plate 10 is formed with a plurality of first hollow patterns 40, and the second printing plate 20 is formed with a second hollow pattern 51. The plurality of first hollow patterns 40 are arranged in a plurality of rows and columns, and the plurality of second hollow patterns 51 are arranged in a plurality of rows and columns, and the row direction of the first hollow patterns 40 is consistent with the row direction of the second hollow patterns 51, and the column direction of the first hollow patterns 40 is consistent with the column direction of the second hollow patterns 51.
[0035] In the same row, the distance between two adjacent first hollow patterns 40 is no greater than the size of the second hollow patterns 51 in the corresponding row along the row direction, and the size of the first hollow pattern 40 along the column direction is greater than the size of the second hollow pattern 51 along the column direction.
[0036] The first hollow pattern 40 and the second hollow pattern 51 are the areas where the metal paste penetrates during the printing process. Through the first hollow pattern 40 of the first printing plate 10 and the second hollow pattern 51 of the second printing plate 20, the metal paste is transferred to the surface of the solar cell and penetrates to form grid lines for current conduction.
[0037] It should be noted that the aperture ratio of the second hollowed-out pattern 51 of the second printing plate 20 is 100%, and the aperture ratio of 100% means that the pattern of the line segment area is completely hollowed out. Generally speaking, for a screen printing plate based on mesh cloth, there is always a wire obstruction in the hollowed-out part, which leads to a decrease in the penetration ability of the metal slurry. Limited by this, the hollow width on the screen printing plate cannot be further reduced, so that the width of the printed grid line cannot be further reduced. The second hollowed-out pattern 51 in the present embodiment is completely hollowed out, and there is no wire obstruction, so the metal slurry penetration ability can be maximized, so that the width of the printed grid line can be further reduced, and the printing of fine grid lines (width less than 25 microns) can be achieved.
[0038] Through the cooperation of the first printing plate 10 and the second printing plate 20, the first hollow pattern 40 of the first printing plate 10 solves the problem of insufficient plate strength and stability caused by the high aperture ratio design of the second printing plate 20, and the dual design of thin and narrow line segments and high aperture ratio of the second printing plate 20 realizes fine grid line printing, thereby further improving the conversion efficiency of solar cells and reducing the cost of using metal silver paste when preparing grid lines.
[0039] Alternatively, if Figure 3 and Figure 4 As shown, the first hollow pattern 40 includes a short hollow pattern 42 and a long hollow pattern 41. A plurality of short hollow patterns 42 and a plurality of long hollow patterns 41 are spaced apart on the first printing plate 10 along the row direction, and the spacing between adjacent short hollow patterns 42 and long hollow patterns 41 is not greater than the size of the corresponding row of second hollow patterns 51 along the row direction.
[0040] like Fig.10 As shown, the first node 410 is printed on the solar cell by the metal paste of the long hollow pattern 41 of the first printing plate 10, the second node 420 is printed on the solar cell by the metal paste of the short hollow pattern 42 of the first printing plate 10, and the gate line segment 510 is printed on the solar cell by the metal paste of the second hollow pattern 51 of the second printing plate 20. Multiple first nodes 410, multiple second nodes 420, and multiple gate line segments 510 constitute a complete electrode gate line. Preferably, 1 to 10 short hollow patterns 42 are distributed between two adjacent long hollow patterns 41.
[0041] Among them, the long hollow pattern 41 is used to print the welding contact point, providing the welding point between the solar cell and the welding strip. Since the second pattern hollowing of the second printing plate 20 adopts a 100% opening rate, if there is no hollow pattern interval 52, the second printing plate 20 may break due to insufficient strength, or the printing is unstable, resulting in deformation of the grid line. Therefore, the short hollow pattern 42 set by the first printing plate 10 provides a space for the second pattern hollowing of the second printing plate 20 to maintain a lateral connection, ensuring the structural strength of the second printing plate 20, so that the width of the second hollow pattern 51 can be further reduced, and the preparation of fine grid lines can be achieved.
[0042] Alternatively, if Figure 7 As shown, the first printing plate 10 is formed with multiple bus line hollow patterns 43, and the multiple bus line hollow patterns 43 are arranged in multiple columns. The column direction of the bus line hollow patterns 43 is consistent with the column direction of the long hollow patterns 41, and the bus line hollow patterns 43 are connected to the long hollow patterns 41.
[0043] In a preferred embodiment, the size of the short hollow pattern 42 along the row direction is 100 microns to 1000 microns, and the size of the short hollow pattern 42 along the column direction is 25 microns to 100 microns. The size of the long hollow pattern 41 along the row direction is 200 microns to 2000 microns, and the size of the long hollow pattern 41 along the column direction is 50 microns to 1000 microns.
[0044] As the main body of the electrode grid line, the grid line width mainly depends on the width of the second hollow pattern 51. In order to realize fine electrode grid lines, optionally, as Figure 5 and Figure 6 As shown, the size of the second hollow pattern 51 along the column direction is 5 micrometers to 20 micrometers. The number of line segment hollowing depends on the number of first nodes 410 and long hollow patterns 41.
[0045] Generally speaking, a solar cell is welded with multiple welding strips, the number of welding strips is 9 to 36. And the electrode of the solar cell is composed of a group of parallel electrode grid lines, the number of grid lines distributed on the cell is usually 100 to 200. Therefore, as an optional embodiment, the number of long hollow patterns 41 along the row direction is 9 to 36, and the number of long hollow patterns 41 along the column direction is 100 to 200.
[0046] Alternatively, if Figure 1 and Figure 2 As shown, both the first printing plate 10 and the second printing plate 20 include a substrate film layer 3 and a frame 1 , and the edge of the substrate film layer 3 is fixed on the frame 1 .
[0047] By fixing the edge of the substrate film layer 3 on the frame 1, it is ensured that the first printing plate 10 and the second printing plate 20 can remain flat during the printing process to avoid distortion or deformation, thereby ensuring the quality and accuracy of the printed grid lines. In this embodiment, there is no special limitation on the fixing method of the substrate film layer 3 and the frame 1. For example, the edge of the substrate film layer 3 can be connected to the inner edge of the frame 1 through the flexible member 2.
[0048] Alternatively, if Figure 8 and Fig. 9 As shown, the substrate film layer 3 includes an organic film layer 32 and an alloy film layer 31 , and the organic film layer 32 is bonded to the alloy film layer 31 .
[0049] The organic film layer 32 is firmly bonded to the alloy film by means of attachment, coating, etc. The organic film layer 32 includes any one of a polyimide film, a photosensitive resin film, and an elastomeric resin film, and the alloy film layer 31 includes any one of a stainless steel film, a nickel alloy film, and a copper alloy film. By forming a composite structure, the organic film layer 32 is brought into contact with the solar cell during the printing process, rather than the alloy film being brought into direct contact with the solar cell. Due to the presence of a microscopic pyramid structure on the surface of the solar cell, the organic film layer 32 can prevent the alloy film layer 31 from contacting the surface of the solar cell, thereby avoiding damage to the microscopic pyramid structure of the solar cell.
[0050] It should be noted that the thickness of the organic film layer 32 and / or the alloy film layer 31 selected for the first printing plate 10 and the second printing plate 20 are not necessarily the same, and the first printing plate 10 and the second printing plate 20 may only include the alloy film layer 31. In actual processing, the appropriate materials and specifications are selected according to the characteristics of the graphics of the first printing plate 10 and the second printing plate 20 to achieve fine grid line graphics.
[0051] In the utility model, there is no special limitation on the thickness of the organic film layer 32 and the alloy film layer 31. Since a smaller thickness is conducive to improving the penetration of the metal slurry during the printing process, the strength of the ultra-thin alloy film will also decrease with the decrease in thickness. Therefore, in an optional embodiment, the thickness of the organic film layer 32 is 1 micron to 10 microns, and the thickness of the alloy film layer 31 is 8 microns to 30 microns. Preferably, one of a stainless steel film, a nickel alloy film or a copper alloy film with a thickness of 10 microns to 15 microns is selected as the substrate, and a hollow pattern corresponding to the electrode grid line pattern is processed on the substrate. And an organic film layer 32 with a thickness of 2 microns to 5 microns is selected as a composite layer, and a hollow pattern corresponding to the substrate is processed on the organic film layer 32.
[0052] Optionally, a first positioning hole 6 is formed in the edge area of the first printing plate 10, and a second positioning hole 7 is formed in the edge area of the second printing plate 20. When the first positioning hole 6 is aligned with the corresponding second positioning hole 7, the slurry of the first hollow pattern 40 and the second hollow pattern 51 can be printed to form a complete grid line.
[0053] By providing the first positioning hole 6 and the second positioning hole 7, the alignment of the first printing plate 10 and the second printing plate 20 during grid line printing is achieved. When the first printing plate 10 and the second printing plate 20 are aligned, the spacing area of the two adjacent first hollow patterns 40 overlaps with the projection of the second hollow pattern 51 along the thickness direction of the first printing plate 10, and the spacing between the two adjacent first hollow patterns 40 is not greater than the size of the corresponding row of second hollow patterns 51 along the row direction, so that the metal paste through the first hollow pattern 40 and the second hollow pattern 51 can print a complete electrode grid line on the solar cell.
[0054] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.
Claims
1. 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 formed with a plurality of first hollowed-out patterns, and the second printing plate is formed with a second hollowed-out pattern; the plurality of first hollowed-out patterns are arranged in a plurality of rows and columns, and the plurality of second hollowed-out patterns are arranged in a plurality of rows and columns, and the row direction of the first hollowed-out patterns is consistent with the row direction of the second hollowed-out patterns, and the column direction of the first hollowed-out patterns is consistent with the column direction of the second hollowed-out patterns; In the same row, the distance between two adjacent first hollow patterns is not greater than the size of the second hollow pattern in the corresponding row along the row direction, and the size of the first hollow pattern along the column direction is greater than the size of the second hollow pattern along the column direction.
2. The printing plate assembly according to claim 1, characterized in that: The first hollow patterns include short hollow patterns and long hollow patterns; a plurality of the short hollow patterns and a plurality of the long hollow patterns are spaced apart on the first printing plate along a row direction, and a distance between adjacent short hollow patterns and the long hollow patterns is not greater than a size of the second hollow patterns of the corresponding row along the row direction.
3. The printing plate assembly according to claim 2, characterized in that: The first printing plate is formed with a plurality of bus line hollow patterns, the plurality of bus line hollow patterns are arranged in a plurality of columns, the column direction of the bus line hollow patterns is consistent with the column direction of the long hollow patterns, and the bus line hollow patterns are connected to the long hollow patterns.
4. The printing plate assembly according to claim 2, characterized in that: The size of the short hollow pattern along the row direction is 100 microns to 1000 microns, and the size of the short hollow pattern along the column direction is 25 microns to 100 microns.
5. The printing plate assembly according to claim 2, characterized in that: The size of the long hollow pattern along the row direction is 200 microns to 2000 microns, and the size of the long hollow pattern along the column direction is 50 microns to 1000 microns.
6. The printing plate assembly according to claim 2, characterized in that: The size of the second hollow pattern along the column direction is 5 microns to 20 microns.
7. The printing plate assembly according to claim 2, characterized in that: The number of the long hollow patterns along the row direction is 9 to 36, and the number of the long hollow patterns along the column direction is 100 to 200.
8. The printing plate assembly according to any one of claims 1 to 7, characterized in that: The first printing plate and the second printing plate both include a substrate film layer and a frame, and the edge of the substrate film layer is fixed on the frame.
9. The printing plate assembly according to claim 8, characterized in that: The substrate film layer includes an organic film layer and an alloy film layer, and the organic film layer is bonded to the alloy film layer; the thickness of the organic film layer is 1 micron to 10 microns, and the thickness of the alloy film layer is 8 microns to 30 microns.
10. The printing plate assembly according to any one of claims 1 to 7, characterized in that: A first positioning hole is formed in the edge area of the first printing plate, and a second positioning hole is formed in the edge area of the second printing plate. When the first positioning hole is aligned with the corresponding second positioning hole, the slurry of the first hollow pattern and the second hollow pattern can be printed to form a complete grid line.