Solar cell screen printing plate
By setting a mesh zone structure of specific angles and shapes in the solar cell screen, the problem of difficult control and breaking of the line width of the grid line in the screen printing is solved, and more efficient printing quality and equipment reliability are achieved.
Patent Information
- Application Number
- CN202420738648.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-10
AI Technical Summary
In the production and manufacturing process of solar cells, there are problems in the screen printing process that the gate line width is difficult to control, the gate is broken, and the wire screen is prone to breaking.
A solar cell mesh is designed, by setting the mesh zone structure of different regions in the wire mesh, including the first mesh zone and the second mesh zone, the longitude mesh and latitude mesh of the first mesh zone are interwoven. The angle formed is 80°≤α≤100°, the mesh cross-sectional shape is quadrilateral, and the mesh cross-sectional shape of the second mesh area is greater than that of the quadrilateral, which improves the support force, controls the line width of the gate line and improves the fracture problem.
The line width of the gate line is effectively controlled, the situation of gate breakage and wire mesh breakage is improved, and the printing quality and the service life of the equipment are improved.
Smart Images
Figure CN222156937U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of solar cells, and in particular to solar cell screens. Background Art
[0002] In the manufacturing process of solar cells, a screen printing process is usually used to print metal paste on the front and / or back of the substrate of the solar cell to form the main grid lines and fine grid lines. However, in the process of screen printing, there are problems such as the grid line width is difficult to control, the grid is broken, and the screen is easy to break. Utility Model Content
[0003] Based on this, it is necessary to provide a solar cell screen to control the line width of the grid line and improve the situation of broken grid and screen breakage.
[0004] The present application embodiment provides a solar cell screen, the solar cell screen comprising:
[0005] Borders; and
[0006] A screen is fixed in the frame, and the screen includes a first screen area and a second screen area surrounding the first screen area;
[0007] The first mesh area is constructed by interweaving a plurality of longitude mesh wires and a plurality of latitude mesh wires, and the angle α between at least part of the longitude mesh wires of the first mesh area and the corresponding intersecting latitude mesh wires meets the condition: 80°≤α≤100°;
[0008] The cross-sectional shape of the mesh opening formed by the interweaving of the longitude mesh wires and the latitude mesh wires in the first mesh gauze area is a first polygon, and the cross-sectional shape of the mesh opening formed by the interweaving of the mesh wires in the second mesh gauze area is a second polygon;
[0009] The first polygon is a quadrilateral, and the number of sides of the second polygon is greater than the number of sides of the first polygon.
[0010] In one embodiment, the angle α between at least part of the longitudinal threads of the first mesh area and the corresponding intersecting latitude threads is 90°; and / or
[0011] The second polygon is configured as a hexagon.
[0012] In one embodiment, the solar cell screen further includes a barrier film covering one side of the screen;
[0013] The barrier film is provided with a plurality of first grid line pattern openings which allow the slurry to pass through and are arranged at intervals along a first direction, and each of the first grid line pattern openings extends along a second direction intersecting the first direction;
[0014] In the area of the screen corresponding to the opening of the first grid line pattern, the connecting lines of a plurality of mesh nodes formed by the intersection of the longitude mesh wires and the latitude mesh wires of the first mesh area are parallel to the second direction.
[0015] In one embodiment, in the area of the screen corresponding to the opening of the first grid line pattern, a line connecting a plurality of mesh nodes formed by the intersection of the longitude mesh wires and the latitude mesh wires is defined as a first line; the angle between the first line and the longitude mesh wires constituting the plurality of mesh nodes is β, and the angle between the first line and the latitude mesh wires constituting the plurality of mesh nodes is γ; wherein β=γ; and / or
[0016] The sidewalls of the first gate line pattern opening are covered with a functional film layer; the surface energy of the functional film layer is smaller than the surface energy of the sidewalls of the first gate line pattern opening; and / or
[0017] The width H of the first gate line pattern opening along the first direction satisfies the condition: 12 μm≤H≤14 μm.
[0018] In one embodiment, the first gate line pattern opening includes sub-gate line pattern openings extending along the second direction, and a first pad pattern opening located between the sub-gate line pattern openings;
[0019] The first pad pattern opening has a plurality of contour edges connected in sequence end to end; any one of the contour edges is constructed as a non-straight line and has a plurality of peaks and a plurality of valleys arranged alternately.
[0020] In one embodiment, the contour edge is configured to extend in a broken line shape, and the contour edge includes a plurality of sequentially connected sub-straight line edges, and adjacent sub-straight line edges form a peak or a valley; or
[0021] The contour edge is configured to extend in a wave shape, and the contour edge includes a plurality of sub-curve edges connected in sequence, and adjacent sub-curve edges form peaks or valleys.
[0022] In one embodiment, the sub-grid pattern opening includes a first segment opening and a second segment opening connecting the first segment opening and the first pad pattern opening;
[0023] The width of the second segment opening increases from one end connected to the first segment opening to the other end connected to the first pad pattern opening.
[0024] In one of the embodiments, the screen further comprises a third screen area independent of the first screen area and the second screen area;
[0025] The third mesh area is adjacent to the frame and corresponds to the first segmented opening, and the third mesh area is configured to be at least partially surrounded by the first mesh area;
[0026] The longitude mesh threads and the latitude mesh threads in the third mesh area are interwoven to form a plurality of mesh openings arranged along the second direction.
[0027] In one embodiment, the width d1 of the longitude mesh satisfies the condition: 8 μm ≤ d1 ≤ 9 μm; and / or
[0028] The width d2 of the latitude mesh satisfies the condition: 8 μm ≤ d2 ≤ 9 μm.
[0029] In one embodiment, the width d1 of the longitude mesh and the width d2 of the latitude mesh satisfy the condition: 0.9≤d1 / d2≤1.1; and / or
[0030] The mesh number S of the mesh openings formed by interweaving the longitude mesh wires and the latitude mesh wires in the first mesh yarn area meets the condition: 420≤S≤490.
[0031] In the above-mentioned solar cell mesh, the solar cell mesh at least includes a frame and a silk screen, and the silk screen includes a first mesh area and a second mesh area. By setting the angle between at least part of the longitude mesh wires of the first mesh area and the corresponding intersecting latitude mesh wires to be greater than or equal to 80° and less than or equal to 100°, and the cross-sectional shape of the mesh opening of the first mesh area is set to a quadrilateral, it is possible to improve not only the widening of the grid line width, but also the broken grid. Since the second mesh area is the area surrounding the first mesh area, the second mesh area is roughly the edge area of the silk screen, and by setting the cross-sectional shape of the mesh opening of the second mesh area to be greater than a quadrilateral, the supporting force of the second mesh area is increased, and when the pressure of the scraper acting on the second mesh area is too large, the situation of the broken silk screen can be improved. Therefore, in the embodiment of the present application, by arranging the silk screen in different areas and using different structures of the silk screen, it is not only convenient to control the line width of the grid line, but also the situation of broken grid and broken silk screen can be improved.
[0032] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the embodiments below. The accompanying drawings are only for the purpose of illustrating the embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:
[0034] Figure 1 This is a schematic diagram of the structure of a solar cell screen in one embodiment of the present application;
[0035] Figure 2 for Figure 1 A schematic diagram of the mesh area of the silk screen of the solar cell screen;
[0036] Figure 3 for Figure 2 A schematic diagram of the partial enlarged structure of the first mesh area in the middle;
[0037] Figure 4 for Figure 2 A schematic diagram of the partial enlarged structure of the second mesh area in the middle;
[0038] Figure 5 Figure 1 A schematic diagram of a side cross-sectional structure of a solar cell screen;
[0039] Figure 6 5 is a schematic structural diagram of the barrier film of the solar cell screen;
[0040] Figure 7 It is a schematic diagram of the local structure of the barrier film and the first mesh area in one embodiment of the present application;
[0041] Figure 8 for Figure 7 A schematic diagram of the local enlarged structure at point A in the middle;
[0042] Fig. 9 for Figure 6 One of the partial enlarged structural diagrams at B in the middle;
[0043] Fig.10 for Figure 6 The second schematic diagram of the local enlarged structure at B in the middle;
[0044] Fig.11 for Figure 6 A schematic diagram of the local enlarged structure at C in the middle;
[0045] Fig.12 This is a schematic diagram of the structure of the barrier film and each mesh area in one embodiment of the present application;
[0046] Fig.13 This is one of the partial enlarged structural schematic diagrams of the screen in one embodiment of the present application;
[0047] Fig.14 for Fig.13 A schematic diagram of the local structure of each mesh area of the screen matching with the barrier film is shown;
[0048] Fig.15 This is the second schematic diagram of the partial enlarged structure of the screen in one embodiment of the present application;
[0049] Fig.16 for Fig.15 A schematic diagram of the local structure of each mesh area of the screen matching with the barrier film is shown;
[0050] Fig.17 This is a schematic structural diagram of the coordination of the longitude mesh wires and the latitude mesh wires in the first mesh area in one embodiment of the present application.
[0051] Description of reference numerals:
[0052] Solar cell screen 100;
[0053] Border 110;
[0054] Screen 120, longitude screen 121, latitude screen 122, first screen area z1, first screen opening w1, second screen area z2, second screen opening w2, third screen area z3, third screen opening w3;
[0055] Blocking film 130, first gate line pattern opening k, sub-gate line pattern opening k1, first segment opening k11, sub-segment opening k111, second segment opening k12, first pad pattern opening k2, harpoon pattern opening k3, second pad pattern opening k4, contour edge b, peak b1, valley b2, functional film layer x;
[0056] Angles α, β, γ, widths H, d1, d2, first connecting line L1;
[0057] The first direction F1, the second direction F2, and the third direction F3. DETAILED DESCRIPTION
[0058] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0059] In the description of the present application, it should be understood that if 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", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application.
[0060] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0061] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated one; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. It is worth noting that in the following description and the attached claims, "electrical connection" between one feature and another feature not only includes one feature directly contacting another feature to form an electric energy transmission or current transmission channel, but also includes an intermediate feature between one feature and another feature, and the one feature, the other feature and the intermediate feature between them form an electric energy transmission channel or a current transmission channel to achieve electric energy transmission or transmission. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0062] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0063] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.
[0064] Figure 1A schematic structural diagram of a solar cell screen 100 in one embodiment of the present application is shown; Figure 2 Shows Figure 1 A schematic diagram of a mesh area of a silk screen 120 of a solar cell screen 100; Figure 3 Shows Figure 2 A schematic diagram of the partial enlarged structure of the first mesh area z1; Figure 4 Shows Figure 2 A partially enlarged structural schematic diagram of the second mesh area z2; for ease of explanation, only the content related to the embodiment of the present application is shown.
[0065] Please refer to Figure 1 and Figure 2 The embodiment of the present application provides a solar cell screen 100, comprising a frame 110 and a screen 120. In the embodiment of the present application, the first direction F1 is the length direction of the solar cell screen 100, the second direction F2 is the width direction of the solar cell screen 100, and the third direction F3 is the thickness direction of the solar cell screen 100. The first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other.
[0066] The frame 110 is a component for carrying and fixing the wire mesh 120. The frame 110 is arranged in a frame shape, and each part of the frame 110 encloses and defines a space for installing the wire mesh 120. Figure 1 and Figure 2 For example, the frame 110 may be a rectangular frame.
[0067] The screen 120 is a component of a screen for printing. The screen 120 is made of mesh threads interwoven to form a mesh opening. The screen 120 and the barrier film 130 ( Figure 1 and Figure 2 (not shown) so that part of all the mesh openings can pass through the slurry, and the other part of the mesh openings cannot pass through the slurry. Figure 2 As shown, the screen 120 includes a first screen area z1 and a second screen area z2 surrounding the first screen area z1. That is, the first screen area z1 roughly corresponds to the middle area of the screen 120, and the second screen area z2 roughly corresponds to the edge area of the screen 120. Further, the shape of the first screen area z1 can be rectangular, and the shape of the second screen area z2 can be a rectangular frame. It can be understood that Figure 1 and Figure 2 The relative positions of the first mesh area z1 and the second mesh area z2 are roughly shown. The specific sizes of the first mesh area z1 and the second mesh area z2 can be set according to actual usage requirements and are not specifically limited here.
[0068] Combined with reference Figure 3, the first mesh area z1 is constructed by interweaving a plurality of longitude mesh wires 121 and a plurality of latitude mesh wires 122. The angle α between at least part of the longitude mesh wires 121 of the first mesh area z1 and the corresponding intersecting latitude mesh wires 122 satisfies the condition: 80°≤α≤100°. The angle α between all the longitude mesh wires 121 of the first mesh area z1 and the corresponding intersecting latitude mesh wires 122 may satisfy the aforementioned condition, or the angle α between part of the longitude mesh wires 121 of the first mesh area z1 and the corresponding intersecting latitude mesh wires 122 may satisfy the aforementioned condition. In the embodiment of the present application, Figure 3 As shown, it shows the situation that the angle α between all the longitude meshes 121 of the first mesh area z1 and the corresponding intersecting latitude meshes 122 meets the above conditions. Exemplarily, the angle α can be 80°, 85°, 90°, 95° or 100°.
[0069] Continue to refer to Figure 3 , the cross-sectional shape of the mesh opening formed by the interweaving of the longitude mesh 121 and the latitude mesh 122 of the first mesh area z1 is a first polygon. That is, the mesh opening of the first mesh area z1 is a first mesh opening, and the cross-sectional shape of the first mesh opening is a first polygon. Figure 4 , the cross-sectional shape of the mesh opening formed by the mesh wires of the second mesh area z2 is a second polygon. That is, the mesh opening of the second mesh area z2 is a second mesh opening w2, and the cross-sectional shape of the second mesh opening w2 is a second polygon. The first polygon is a quadrilateral, and the number of sides of the second polygon is greater than the number of sides of the first polygon. Exemplarily, the number of sides of the second polygon can be five sides, six sides, or seven sides.
[0070] It should be noted that the longitude mesh 121 and latitude mesh 122 mentioned above are relative, and do not limit the positions of the longitude mesh 121 and latitude mesh 122. Interlaced mesh refers to two meshes having an intersection, and does not limit the process of making the screen 120.
[0071] When printing the screen 120, slurry is poured into one end of the screen 120, and a certain pressure is applied to the slurry part of the screen 120 with a scraper, while moving toward the other end of the screen 120. The slurry is squeezed from the mesh opening of the corresponding graphic part to the corresponding substrate by the scraper during movement to form the required grid line pattern. In this process, it is easy to cause the pressure of the scraper acting on the edge area of the screen 120 to be too large, thereby causing the edge area of the screen 120 to break. In the embodiment of the present application, since the second mesh area z2 is the area surrounding the first mesh area z1, the second mesh area z2 is roughly the edge area of the screen 120, and the cross-sectional shape of the mesh opening of the second mesh area z2 is set to be larger than a quadrilateral, the supporting force of the second mesh area z2 is increased, and then when the pressure of the scraper acting on the second mesh area z2 is too large, the situation of the screen 120 breaking can be improved.
[0072] The inventor of the present application has further studied and found that the size of the opening of the first mesh area z1 will directly affect the leakage of the slurry, which is prone to the situation of broken grids and excessive width of the grid lines. Therefore, by setting the angle between at least part of the longitude mesh wires 121 of the first mesh area z1 and the corresponding intersecting latitude mesh wires 122 to be greater than or equal to 80° and less than or equal to 100°, and setting the cross-sectional shape of the mesh opening of the first mesh area z1 to a quadrilateral, it can not only facilitate the slurry to fall to improve the situation of broken grids, but also improve the situation of grid line widening by limiting the slurry from falling.
[0073] Therefore, in the embodiment of the present application, the screen 120 is divided into zones and the meshes in different zones are provided with different structures, which not only facilitates the control of the line width of the grid lines, but also improves the situation of broken grids and broken screen 120.
[0074] In some embodiments, please refer to Figures 1 to 3 , the angle α between at least part of the longitude mesh yarns 121 of the first mesh zone z1 and the corresponding intersecting latitude mesh yarns 122 is 90°.
[0075] In this way, when the angle α is 90°, it is more conducive to improving the gate line width and the gate break.
[0076] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4 , the second polygon is configured as a hexagon. Exemplarily, the second polygon is configured as a regular hexagon.
[0077] In this way, by constructing the second polygon as a hexagon, the mesh openings in the second mesh area z2 are roughly arranged in a honeycomb shape, which is beneficial to improving the supporting force of the second mesh area z2.
[0078] In some embodiments, please refer to Figures 1 to 3 The first polygon is a square. This is not only beneficial to improving the width of the gate line and the gate break, but also beneficial to processing and manufacturing.
[0079] Figure 5 shows Figure 1 A schematic diagram of a side cross-sectional structure of a solar cell screen 100; Figure 6 5 shows a schematic structural diagram of the barrier film 130 of the solar cell screen 100; Figure 7 A schematic diagram of the local structure of the barrier film 130 and the first mesh area z1 in an embodiment of the present application is shown; for ease of explanation, only the content related to the embodiment of the present application is shown.
[0080] In some embodiments, please refer to FIG. 5, the solar cell screen 100 also includes a barrier film 130 covered on one side of the screen 120. One side of the screen 120 is a side of the screen 120 along the third direction F3. The barrier film 130 can be made of one of a photosensitive emulsion, a PI film (Polyimide Film) or a hollow metal sheet. In the embodiment of the present application, the barrier film 130 is a PI film. As mentioned above, the barrier film 130 is a component used in conjunction with the screen 120. Specifically, the barrier film 130 is provided with a plurality of first grid line pattern openings k that allow the slurry to pass through and are arranged at intervals along the first direction F1, and each first grid line pattern opening k extends along the second direction F2 intersecting the first direction F1. In the embodiment of the present application, the situation where the first direction F1 and the second direction F2 are perpendicular to each other is illustrated. That is, the extension direction of the grid line formed by the first grid line pattern opening k is the second direction F2. The first grid line pattern can be a main grid line or a secondary grid line. Correspondingly, the first gate line pattern opening k can be used to form a main gate line, and can also be used to form a secondary gate line. Figure 6 , which schematically illustrates a situation in which a first gate line pattern opening k for forming a main gate line is provided on the blocking film 130 .
[0081] In the area of the screen 120 corresponding to the first grid line pattern opening k, the line connecting the multiple mesh nodes formed by the intersection of the longitude mesh 121 and the latitude mesh 122 of the first mesh area z1 is parallel to the second direction F2. The line connecting the multiple mesh nodes formed by the intersection of the longitude mesh 121 and the latitude mesh 122 is defined as the first line L1. That is, the first line L1 and the second direction F2 are parallel to each other. Exemplarily, the first line L1 can correspond to the middle position in the width direction of the first grid line pattern opening k.
[0082] Such a design, relative to the situation where there is no mesh knot in the area corresponding to the first grid line pattern opening k, by locating some mesh knot points in the first mesh area z1 in the area corresponding to the first grid line pattern opening k, allows the slurry to fall from the first grid line pattern opening k through the mesh knot points, thereby blocking the slurry and being more conducive to suppressing the widening of the grid line width.
[0083] Figure 8 Shows Figure 7 A schematic diagram of the local enlarged structure at point A in the figure; for ease of explanation, only the content related to the embodiment of the present application is shown.
[0084] In some embodiments, please refer to Figure 7 , and combined with reference Figure 8 The angle between the first connecting line L1 and the longitude mesh 121 constituting the plurality of mesh nodes is β, and the angle between the first connecting line L1 and the latitude mesh 122 constituting the plurality of mesh nodes is γ. β=γ.
[0085] In this way, the distribution of the longitude mesh 121 and the latitude mesh 122 corresponding to the first grid line pattern opening k is more uniform, which is more conducive to improving the uniformity of the slurry falling from the first grid line pattern opening k, further controlling the line width of the grid line and improving the broken grid, thereby improving the printing quality.
[0086] In some embodiments, please refer to Figure 8 The sidewall of the first gate line pattern opening k is covered with a functional film layer x. The surface energy of the functional film layer x is smaller than the surface energy of the sidewall of the first gate line pattern opening k.
[0087] It can be understood that since the functional film layer x is a solid, the surface energy of the functional film layer x can be understood with reference to the definition of solid surface energy. The surface tension of the liquid that is added to the solid surface does not become a droplet but is in a state of wetting the solid surface (the contact angle with the solid surface is 0°) is called the solid surface energy of the solid. The surface energy of a liquid refers to the energy state of the surface layer of liquid molecules. When the surface energy of a liquid is greater than the surface energy of a solid, it is difficult for the liquid to wet the surface of the solid, that is, it is difficult for the liquid to adsorb on the surface of the solid, and the liquid is in a state of easy flow on the surface of the solid.
[0088] In this way, when the slurry falls from the first grid line pattern opening k, it will contact the functional film layer x. Since the surface energy of the functional film layer x is smaller, it is difficult for the slurry to wet the functional film layer x, and it is difficult for the slurry to stay in the first grid line pattern opening k, which helps to improve the situation where the slurry remains in the first grid line pattern opening k, and facilitates the slurry to fall from the first grid line pattern opening k. On this basis, it is also beneficial to improve the printing quality of the grid line.
[0089] It should be noted that the material of the functional film layer x can be selected according to the slurry used. In other words, the material that can meet the use requirements can be selected from the existing materials according to the required surface energy of the functional film layer x, as long as it can meet the use requirements, and the embodiment of the present application does not impose specific restrictions on this. For example, the functional film layer x can be formed by a primary coating process or a secondary coating process, and the functional film layer x can be an alloy film.
[0090] In some embodiments, please refer to Figure 8 , the width H of the first gate line pattern opening k along the first direction F1 satisfies the condition: 12 μm≤H≤14 μm. Exemplarily, H may be 12 μm, 12.5 μm, 13 μm, 13.5 μm or 14 μm. For example, H may be 13.8 μm.
[0091] Thus, by controlling the width of the first gate line pattern opening k, it is advantageous to control the width of the gate line to be 25 μm to 30 μm. Of course, according to the required width of the gate line, the width of the first gate line pattern opening k along the first direction F1 can also be other values, which are not specifically limited here.
[0092] Fig. 9 Shows Figure 6 One of the partial enlarged structural schematic diagrams at B in the figure; for ease of explanation, only the content related to the embodiment of the present application is shown.
[0093] In some embodiments, please refer to Figure 6 , and combined with reference Fig. 9 The first gate line pattern opening k includes a sub-gate line pattern opening k1 extending along the second direction F2, and a first pad pattern opening k2 located at both ends of the sub-gate line pattern opening k1 along the second direction F2. The first pad pattern opening k2 is used to form pads located at both ends of the gate line. The first pad pattern opening k2 has a plurality of contour edges b connected end to end in sequence. Any contour edge b is constructed as a non-straight line and has a plurality of peaks b1 and a plurality of valleys b2 arranged alternately.
[0094] Combined with reference Fig. 9 Taking the first pad pattern opening k2 as an example, which is substantially rectangular, the first pad pattern opening k2 has four contour edges b. Each contour edge b is configured as a non-linear line and has a plurality of peaks b1 and a plurality of valleys b2 arranged alternately. The peaks b1 and the valleys b2 are relative. The peaks b1 are the portions of the contour edge b that protrude toward the inside of the first pad pattern opening k2, and the valleys b2 are the portions of the contour edge b that are recessed away from the inside of the first pad pattern opening k2.
[0095] A pad with a larger area is usually provided at both ends of the longitudinal direction of the gate line to facilitate the connection between the gate line and the solder strip. However, when printing a pad with a larger area, the corresponding pad graphic opening also needs to be set larger, which causes the slurry to become larger after falling through the pad graphic opening, making it difficult to shape the slurry. For example, a hollow part or an unshaped outer contour appears in the slurry at the pad position. In an embodiment of the present application, by constructing the contour edge b into a structure of multiple peaks b1 and multiple valleys b2 arranged alternately, the expansion of the falling slurry can be improved, which is beneficial to the slurry molding and improves the printing quality.
[0096] Fig.10 Shows Figure 6 The second schematic diagram of the local enlarged structure at B in the figure; for the convenience of explanation, only the content related to the embodiment of the present application is shown.
[0097] In some embodiments, please refer to Fig. 9, the contour edge b is configured to extend in a broken line shape, and the contour edge b includes a plurality of sequentially connected sub-straight edges, and the adjacent sub-straight edges form a peak b1 or a valley b2. In other embodiments, please refer to Fig.10 The contour edge b is constructed to extend in a wave shape, and the contour edge b includes a plurality of sub-curve edges connected in sequence, and the adjacent sub-curve edges constitute a peak portion b1 or a valley portion b2.
[0098] In this way, the structure of the contour edge b can be flexibly set according to the use requirements, as long as it can improve the situation of slurry expansion, and no specific limitation is made here.
[0099] In some embodiments, please continue to refer to Fig. 9 and Fig.10 The sub-grid pattern opening k1 includes a first segment opening k11 and a second segment opening k12 connecting the first segment opening k11 and the first pad pattern opening k2. The width of the second segment opening k12 increases from one end connected to the first segment opening k11 to the other end connected to the first pad pattern opening k2.
[0100] It should be noted that the "increasing trend" may include a staged increase, such as increasing first, then remaining unchanged, and then increasing, etc.; it may also include a continuous increase, such as a consistent increase speed or a fast increase first and then a slow increase, etc. Taking the increasing trend as increasing first, then remaining unchanged, and then increasing as an example, the increasing trend is divided into three stages: the "first increase" stage, the "no change" stage, and the "later increase" stage. That is, on the whole, the width of the second segment opening k12 is generally increased. Exemplarily, the width of the second segment opening k12 gradually increases from one end connected to the first segment opening k11 to the other end connected to the first pad pattern opening k2.
[0101] In this way, since the size of the first pad pattern opening k2 is larger than the size of the second segment opening k12, the gate breaking problem can be improved by configuring the width of the second segment opening to increase.
[0102] In some embodiments, please refer to Fig. 9 and Fig.10, the first gate line graphic opening k also includes a harpoon graphic opening k3. The harpoon graphic opening k3 is an opening for forming a harpoon connecting line. The harpoon graphic opening k3 is connected to the side of the first pad graphic opening k2 that deviates from the second segment opening k12. The width of the harpoon graphic opening k3 shows an increasing trend from one end connected to the first pad graphic opening k2 to the other end that deviates from the first pad graphic opening k2. The relevant understanding and relevant implementation methods of the increasing trend can be referred to the contents illustrated in some of the aforementioned embodiments, which will not be repeated here. Exemplarily, the width of the harpoon graphic opening k3 gradually increases from one end connected to the first pad graphic opening k2 to the other end that deviates from the first pad graphic opening k2.
[0103] Since the tension of the mesh wire is greater as it is closer to the edge, it is easy to hinder the slurry from falling. By controlling the width of the harpoon connecting line, it is easier to make and shape the harpoon connecting line.
[0104] Fig.11 Shows Figure 6 A schematic diagram of the local enlarged structure at point C in the middle; for ease of explanation, only the content related to the embodiment of the present application is shown.
[0105] In some embodiments, please continue to refer to 6 and combine with reference to Fig.11 , the first gate line pattern opening k also includes a plurality of second pad pattern openings k4. The plurality of second pad pattern openings k4 are sequentially spaced along the second direction F2. The first segmented opening k11 includes a plurality of sub-segmented openings k111 extending along the second direction F2, and the plurality of sub-segmented openings k111 are sequentially spaced along the second direction F2. Along the second direction F2, a second pad pattern opening k4 is connected between two adjacent sub-segmented openings k111. The second pad pattern opening k4 is used to form a pad disposed on the main gate line, and the pad intersects or does not intersect with the secondary gate line.
[0106] Thus, by correspondingly setting the second pad pattern opening k4, the connection between the main grid line and the soldering strip can be realized. The pad formed by the second pad pattern opening k4 can be set smaller, which can reduce the light shielding area of the pad.
[0107] Fig.12 A schematic diagram of the structure of the barrier film 130 cooperating with each mesh area in one embodiment of the present application is shown; Fig.13 One of the partial enlarged structural schematic diagrams of the screen 120 in one embodiment of the present application is shown; Fig.14 Shows Fig.13 The schematic diagram of the partial structure of each mesh area of the screen 120 and the barrier film 130 is shown; for the convenience of explanation, only the content related to the embodiment of the present application is shown. Fig.12 In the figure, only the approximate location of the mesh area is shown. Fig.14Only the approximate position of the mesh area and the structure of the third mesh area z3 are shown.
[0108] In some embodiments, please refer to Figure 12 to Figure 14 , the screen 120 also includes a third mesh area z3 independent of the first mesh area z1 and the second mesh area z2. The third mesh area z3 is adjacent to the frame 110 and corresponds to the first segmented opening k11, and the third mesh area z3 is constructed to be at least partially surrounded by the first mesh area z1. That is, at least part of the boundary of the third mesh area z3 is adjacent to the first mesh area z1. Among them, the longitude mesh wires 121 and the latitude mesh wires 122 of the third mesh area z3 are interwoven to form a plurality of mesh openings arranged along the second direction F2. The mesh opening of the third mesh area z3 is the third mesh opening w3. That is, all the third mesh openings w3 are arranged along the second direction F2. Specifically, the third mesh opening w3 can be arranged in a rectangular shape.
[0109] It can be understood that since the tension of the mesh closer to the edge is greater, it is easy to hinder the pulp from falling. By setting the third mesh area z3, it can be beneficial for the pulp to fall, thereby improving the situation of broken mesh.
[0110] It should be noted that the position of the third mesh area z3 can be determined by the position of the first mesh area z1. The first pad graphic opening k2 can correspond to the first mesh area z1 or the second mesh area z2. When the first pad graphic opening k2 corresponds to the first mesh area z1, the third mesh area z3 can be constructed to be completely surrounded by the first mesh area z1. When the second pad graphic corresponds to the second mesh area z2, the third mesh area z3 can be constructed to be partially surrounded by the first mesh area z1. Figures 13 to 16 For example, Fig.15 FIG. 2 shows a second partial enlarged structural diagram of the screen 120 in an embodiment of the present application. Fig.16 Shows Fig.15 The schematic diagram of the partial structure of each mesh area of the screen 120 and the barrier film 130 is shown, showing that a part of the third mesh area z3 is surrounded by the first mesh area z1, and the other part is surrounded by the second mesh area z2. In the case where the first pad pattern opening k2 corresponds to the first mesh area z1 or the second mesh area z2, the boundary line of the first mesh area z1 can be set as close to the first pad pattern opening k2 as possible. It can be flexibly set according to the usage, and no specific limitation is made here.
[0111] Fig.17 A schematic structural diagram of the coordination of the longitude mesh 121 and the latitude mesh 122 of the first mesh zone z1 in an embodiment of the present application is shown; for ease of explanation, only the contents related to the embodiment of the present application are shown.
[0112] In some embodiments, please refer to Figure 3 , Figure 7 and Figure 8 , and combined with reference Fig.17 The width d1 of the longitude mesh 121 satisfies the condition: 8 μm ≤ d1 ≤ 9 μm; and / or the width d2 of the latitude mesh 122 satisfies the condition: 8 μm ≤ d2 ≤ 9 μm. Exemplarily, d1 may be 8 μm, 8.2 μm, 8.5 μm, 8.8 μm or 9 μm, and d2 may be 8 μm, 8.2 μm, 8.5 μm, 8.8 μm or 9 μm.
[0113] In this way, by controlling the width of the longitude mesh 121 and the width of the latitude mesh 122 , it is advantageous to print grid lines of a desired width.
[0114] In some embodiments, please refer to Figure 3 , Figure 7 and Figure 8 , and combined with reference Fig.17 , the width d1 of the longitude mesh 121 and the width d2 of the latitude mesh 122 satisfy the condition: 0.9≤d1 / d2≤1.1; and / or, the mesh number S of the mesh formed by the longitude mesh 121 and the latitude mesh 122 of the first mesh area z1 satisfies the condition: 420≤S≤490. Exemplarily, d1 / d2 may be 0.9, 0.95, 0.99, 1, 1.05 or 1.1, and S may be 420, 430, 440, 450, 470, 480 or 490. For example, S may be 430.
[0115] In this way, by controlling the ratio of the width of the longitude mesh 121 to the width of the latitude mesh 122, as well as the mesh size of the mesh formed by the interweaving of the longitude mesh 121 and the latitude mesh 122 in the first mesh area z1, it is beneficial to balance the size of the opening, thereby improving the molding performance of the slurry while having a certain amount of slurry leakage.
[0116] In some embodiments, the mesh of the screen 120 may be made of nickel alloy, which has advantages such as excellent elongation, compressive strength, surface finish, oxidation resistance, corrosion resistance and low price, which is beneficial to not only improving printing quality but also reducing costs.
[0117] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0118] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A solar cell screen, characterized in that: The solar cell screen comprises: Borders; and A screen is fixed in the frame, the screen comprising a first screen area and a second screen area surrounding the first screen area; The first mesh area is constructed by interweaving a plurality of longitude meshes and a plurality of latitude meshes, and the angle α between at least part of the longitude meshes in the first mesh area and the corresponding intersecting latitude meshes meets the condition: 80°≤α≤100°; The cross-sectional shape of the mesh opening formed by the interweaving of the longitude mesh wires and the latitude mesh wires in the first mesh area is a first polygon, and the cross-sectional shape of the mesh opening formed by the interweaving of the mesh wires in the second mesh area is a second polygon; The first polygon is a quadrilateral, and the number of sides of the second polygon is greater than the number of sides of the first polygon.
2. The solar cell screen according to claim 1, characterized in that: The angle α between at least part of the longitude mesh threads of the first mesh area and the corresponding intersecting latitude mesh threads is 90°; and / or The second polygon is configured as a hexagon.
3. The solar cell screen according to claim 1 or 2, characterized in that: The solar cell screen also includes a barrier film covering one side of the screen; The barrier film is provided with a plurality of first grid line pattern openings which allow the slurry to pass through and are arranged at intervals along a first direction, and each of the first grid line pattern openings extends along a second direction intersecting the first direction; In the area of the screen corresponding to the opening of the first grid line pattern, the connecting lines of a plurality of mesh nodes formed by the intersection of the longitude mesh wires and the latitude mesh wires of the first mesh area are parallel to the second direction.
4. The solar cell screen according to claim 3, characterized in that: In the area of the screen corresponding to the opening of the first grid line pattern, a line connecting a plurality of mesh nodes formed by the intersection of the longitude mesh wires and the latitude mesh wires is defined as a first line; the angle between the first line and the longitude mesh wires constituting the plurality of mesh nodes is β, and the angle between the first line and the latitude mesh wires constituting the plurality of mesh nodes is γ; wherein β=γ; and / or The sidewalls of the first gate line pattern opening are covered with a functional film layer; the surface energy of the functional film layer is smaller than the surface energy of the sidewalls of the first gate line pattern opening; and / or A width H of the first gate line pattern opening along the first direction satisfies the condition: 12 μm≤H≤14 μm.
5. The solar cell screen according to claim 3, characterized in that: The first gate line pattern opening includes a sub-gate line pattern opening extending along the second direction, and first pad pattern openings located at both ends of the sub-gate line pattern opening along the second direction; The first pad pattern opening has a plurality of contour edges connected in sequence end to end; any one of the contour edges is constructed as a non-straight line and has a plurality of peaks and a plurality of valleys arranged alternately.
6. The solar cell screen according to claim 5, characterized in that: The contour edge is configured to extend in a broken line shape, and the contour edge includes a plurality of sequentially connected sub-straight line edges, and the adjacent sub-straight line edges constitute the peak portion or the valley portion; or The contour edge is configured to extend in a wave shape, and the contour edge includes a plurality of sub-curve edges connected in sequence, and the adjacent sub-curve edges constitute the peak portion or the valley portion.
7. The solar cell screen according to claim 5, characterized in that: The sub-grid pattern opening includes a first segment opening and a second segment opening connecting the first segment opening and the first pad pattern opening; The width of the second segment opening increases from one end connected to the first segment opening to the other end connected to the first pad pattern opening.
8. The solar cell screen according to claim 7, characterized in that: The screen also includes a third mesh area independent of the first mesh area and the second mesh area; The third mesh area is adjacent to the frame and corresponds to the first segmented opening, and the third mesh area is configured to be at least partially surrounded by the first mesh area; The longitude mesh threads and the latitude mesh threads of the third mesh area are interwoven to form a plurality of mesh openings arranged along the second direction.
9. The solar cell screen according to claim 1 or 2, characterized in that: The width d1 of the longitude mesh meets the condition: 8 μm≤d1≤9 μm; and / or The width d2 of the latitude mesh satisfies the condition: 8 μm≤d2≤9 μm.
10. The solar cell screen according to claim 9, characterized in that: The width d1 of the longitude mesh and the width d2 of the latitude mesh satisfy the condition: 0.9≤d1 / d2≤1.1; and / or The mesh number S of the mesh openings formed by interweaving the longitude mesh yarns and the latitude mesh yarns in the first mesh yarn area meets the condition: 420≤S≤490.