Solar cell different-direction unequal-tension printing template
By setting unequal-width tensioned wire mesh and friction-increasing damping points on the printing plate, the problem of insufficient friction damping force of the printing plate during the doctor blade scraping process is solved, and stable printing of high-precision electrode grid lines and uniform paste distribution are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-27
- Publication Date
- 2026-04-07
AI Technical Summary
Existing printing plates lack frictional damping force during the squeegee scraping process, resulting in unstable printing quality and making it difficult to achieve uniform printing of high-precision electrode grid lines.
A non-uniform tension printing template is designed. By setting tensioned wire meshes of unequal width and friction-increasing damping points on the printing plate, the friction damping force is enhanced, ensuring stable movement of the doctor blade and uniform extrusion of the paste.
This achieves stable doctor blade movement, improves printing quality, ensures uniformity and printing accuracy of electrode grid lines, and enhances the penetration and adhesion of the paste.
Smart Images
Figure CN224089863U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the printing template of solar photovoltaic cell fine grid line, especially a kind of printing template structure of thin metal substrate. BACKGROUND
[0002] The finer the electrode grid line on solar photovoltaic cell is, the higher its power generation efficiency is, and correspondingly, its printing difficulty is greater. At present, the electrode grid line on most photovoltaic cells is still printed by silk screen printing process, but with the electrode grid line becoming more and more fine, the structure type and manufacturing process of silk screen printing screen have gradually approached the limit, and it is difficult to break through. Therefore, in recent years, a photovoltaic cell printing steel plate with thin metal substrate instead of metal screen has appeared in the market. This printing steel plate does not have the knots formed by the alternate weaving of warp and weft lines of traditional silk screen, greatly improves the opening rate of the printing template, has better ink permeability, effectively reduces the manufacturing cost, and is conducive to the development of micro-fine battery grid line electrode.
[0003] Although steel plate printing has its own advantages compared with silk screen printing, the tension change on the surface of the printing steel plate during the squeegee printing process will have a very negative impact on the printing quality. Especially in the silk screen printing process, the knots are formed by the alternate weaving of warp and weft lines of the metal screen. Although this silk screen knot greatly affects the ink permeability of the silk screen, it can form a friction damping effect during the squeegee process. This friction damping effect not only effectively controls and stabilizes the squeegee movement, is conducive to the balanced squeegee effect on the paste, but also enhances the extrusion effect of the paste, which is conducive to the improvement of ink permeability. However, the thin metal substrate of the printing steel plate has a smooth surface, although there is no knot problem, but it cannot produce friction damping effect on the moving squeegee, it is difficult to control the stable movement of the squeegee port, which is not only not conducive to the balanced squeegee of the printing paste, and it is difficult to form complete and uniform electrode grid line, but also weakens the extrusion effect of the squeegee on the paste, which is not conducive to the improvement of ink permeability, especially in the printing process of fine electrode grid line. SUMMARY
[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a solar cell printing template with reasonable steel plate tension and effective friction damping force on the surface of the steel plate.
[0005] To solve the above-mentioned technical problems, the present invention provides a solar cell anisotropic tension printing template, comprising a printing plate frame and a printing steel plate. The printing steel plate is stretched onto the printing plate frame by a tensioning wire mesh. The width of the tensioning wire mesh between one side of the printing steel plate and the printing plate frame is L1, and the width of the tensioning wire mesh between the other side of the printing steel plate and the printing plate frame is L2, where L2 > L1. The printing steel plate surface is provided with a plurality of steel plate grooves and a plurality of friction-increasing damping points. The steel plate grooves include material-containing grooves and scraping grooves, with the scraping grooves located at the bottom of the material-containing grooves. The friction-increasing damping points are distributed on both sides of the steel plate grooves, and each friction-increasing damping point includes a pit on the printing steel plate and a friction-increasing block filling the pit.
[0006] Preferably, the tensioned wire mesh is a polyester wire mesh, and the L2 of the tensioned wire mesh is (1.5-2.5)L1.
[0007] Preferably, the printing plate is a thin metal plate with a thickness h1 = 0.01mm-0.03mm.
[0008] Preferably, the width of the squeegee groove is A1 = 0.008mm-0.015mm; the width of the material receiving groove is A2, A2 = (10-20)A1.
[0009] Preferably, the steel plate groove is arranged along the scraping direction of the squeegee; the material-containing groove is a sloping-bottom groove.
[0010] Preferably, the shape of the friction-enhancing block matches the cavity of the pit, and the top surface of the friction-enhancing block is a plane, which is located on the same plane as the surface of the printing plate.
[0011] Preferably, the shape of the friction-enhancing block matches the cavity of the pit, and the top surface of the friction-enhancing block is an arc-shaped surface, the vertex of which is higher than the upper surface of the printing plate.
[0012] Preferably, the pit of the friction-increasing damping point is circular, rectangular, or triangular; the depth of the pit of the friction-increasing damping point is h2, the thickness of the printing plate is h1, and h2 = (2 / 5 - 3 / 5)h1.
[0013] In the above structure, because the two sides of the printing plate are equipped with tensioned wire mesh of unequal width, the width of the tensioned wire mesh on the squeegee pressing path is greater than that on the other side. This generates more elasticity in the squeegee pressing path direction than in the other direction. During the squeegee pressing process, the groove can more easily get close to the battery substrate under the action of the squeegee to achieve accurate printing. Furthermore, the printing plate rebounds more quickly and reliably after printing. More importantly, this unequal width tensioned wire mesh setting can also effectively reduce the change of tension in the width direction of the groove, suppress and avoid deformation and warping of the groove, and avoid paste leakage caused by groove deformation. Furthermore, because several friction-increasing damping points are set on the surface of the printing plate, the friction-increasing blocks at these points can generate a certain damping force on the squeegee during the squeegee's movement. This damping effect generated by friction can effectively control and stabilize the squeegee's movement, preventing slippage or stumbling on the smooth printing plate surface. This not only ensures that the squeegee can exert a balanced squeegee force on the ink, but also enhances the squeezing effect of the squeegee on the ink in the groove, thus improving the even ink penetration effect. Additionally, since the plate groove includes a material-containing groove and a squeegee groove, with the squeegee groove located at the bottom of the material-containing groove, a stepped opening material-containing structure is formed. This allows the ink in the material-containing groove cavity to be printed onto the printing substrate with a certain printing pressure during squeegee printing. This effectively improves the ink penetration and adhesion, and makes the ink thickness easier to control, ensuring the regularity and continuity of the printed circuit electrodes, which is beneficial for achieving high-precision printing. Attached Figure Description
[0014] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the anisotropic tension printing template for solar cells of this utility model.
[0015] Figure 1 This is a schematic diagram of a specific embodiment of the photovoltaic cell printing steel plate with a damping structure according to this utility model;
[0016] Figure 2 yes Figure 1 A cross-sectional structural diagram of the embodiment shown;
[0017] Figure 3 yes Figure 1 An enlarged structural schematic diagram of the steel plate groove A-A section in the embodiment shown;
[0018] Figure 4 yes Figure 1 An enlarged view of a specific structure along the B-B cross section of the friction-increasing damping point in the embodiment shown.
[0019] Figure 5 yes Figure 1An enlarged view of another specific structure of the friction-increasing damping point B-B section in the embodiment shown.
[0020] In the diagram, 1—printing plate frame, 2—tensioning wire mesh, 3—printing steel plate, 4—steel plate groove, 5—friction-increasing damping point, 6—scraping groove, and 7—material-containing groove. Detailed Implementation
[0021] like Figure 1 , Figure 2 The solar cell anisotropic tension printing template shown has a printing plate frame 1, which is a rectangular frame made of aluminum alloy. A window for stretching the printing steel plate 3 and the tensioning wire mesh 2 is located at the center of the printing plate frame 1. The printing steel plate 3 is stretched to the bottom side of the printing plate frame 1 by the tensioning wire mesh 2. The outer perimeter of the printing steel plate 3 is bonded to the inner edge of the window of the tensioning wire mesh 2 using adhesive. The tensioning wire mesh 2 is a U-shaped polyester wire mesh. The printing steel plate 3 is a rectangular stainless steel sheet with a thickness of h1 = 0.026 mm. The distance from one adjacent vertical side of the rectangular stainless steel sheet to the printing plate frame 1 is the width L1 of the tensioning wire mesh 2 on that side, and the distance from the other side to the printing plate frame 1 is the width L2 of the tensioning wire mesh 2 on that side, where L2 > L1. In this embodiment, L2 = 5 cm and L1 = 2 cm. The printing steel plate 3 can also be other metal sheets.
[0022] Several rows of grooves 4 are provided on the printing plate 3, and each row includes several grooves 4. The longitudinal direction of the grooves 4 is parallel to the direction of the scraper's movement (e.g., ...). Figure 1 The direction of the arrows in the image is consistent with the direction of the squeegee's movement, meaning that the squeegee moves along the longitudinal direction of the groove 4 on the printing plate to achieve the printing of the paste. Several friction-increasing damping points 5 are also densely distributed on the printing plate 3.
[0023] Figure 3 A magnified cross-sectional view of the printing plate groove 4 is shown, with the thickness of the printing plate 3 being h1 = 0.026 mm. The printing plate groove 4 includes a material-containing groove 7 located on the squeegee side and a squeegee groove 6 located on the printing side, i.e., the squeegee groove 6 is located at the bottom of the material-containing groove 7. Under the action of the squeegee, the printing paste is squeegeed onto the battery substrate through the material-containing groove 7 and the squeegee groove 6 to form electrode grid lines. The material-containing groove 7 and the squeegee groove 6 are of equal length. The groove width A1 of the squeegee groove 6 is 8 μm. The material-containing groove 7 has a sloping bottom, which facilitates the introduction of silver paste into the squeegee groove 6. The groove width A2 of the material-containing groove 7 is 120 μm; the groove depth h2 of the material-containing groove 7 is 0.013 mm. Preferably, A2 = (10-20)A1, h2 = (2 / 5-3 / 5)h1.
[0024] Figure 4An enlarged cross-sectional view of a friction-increasing damping point 5 is shown. The friction-increasing damping point 5 includes a recess on the surface of the printing plate 3. In this embodiment, the recess on the printing plate 3 is circular. A friction-increasing block is filled in the circular recess, and the upper surface of the friction-increasing block is on the same plane as the upper surface of the printing plate 3. In this embodiment, the friction-increasing block is made of rubber material, but it can also be made of ultra-high molecular weight polyethylene or nylon-based composite materials, or other corresponding friction-increasing materials.
[0025] Figure 5 An enlarged cross-sectional view of another friction-increasing damping point is shown. The difference between this embodiment and the above embodiment is that the top surface of the friction-increasing block is an arc-shaped surface, and the vertex of the arc-shaped surface is higher than the upper surface of the printing plate 3.
[0026] The above are only some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of this utility model should be considered to fall within the protection scope of this utility model.
Claims
1. A solar cell anisotropic tension printing template, comprising a printing plate frame (1) and a printing steel plate (3), wherein the printing steel plate (3) is stretched onto the printing plate frame (1) by a tensioning wire mesh (2), characterized in that: The width of the tension wire mesh (2) between one side of the printing plate (3) and the printing plate frame (1) is L1, and the width of the tension wire mesh (2) between the other side of the printing plate (3) and the printing plate frame (1) is L2, where L2 > L1; the printing plate (3) has several plate grooves (4) and several friction-increasing damping points (5) on its surface; the plate grooves (4) include material-containing grooves (7) and printing grooves (6), with the printing grooves (6) located at the bottom of the material-containing grooves (7); the friction-increasing damping points (5) are distributed on both sides of the plate grooves (4), and each friction-increasing damping point (5) includes a pit on the printing plate (3) and a friction-increasing block filled in the pit.
2. The solar cell anisotropic tension printing template according to claim 1, characterized in that: The tensioned wire mesh (2) is a polyester wire mesh, and the L2 of the tensioned wire mesh (2) is (1.5-2.5)L1.
3. The solar cell anisotropic tension printing template according to claim 1, characterized in that: The printing plate (3) is a thin metal plate with a thickness h1 = 0.01 mm - 0.03 mm.
4. The solar cell anisotropic tension printing template according to claim 1, 2 or 3, characterized in that: The groove width of the scraping groove (6) is between 0.008mm and 0.015mm; the groove width of the material receiving groove (7) is A2, A2 = (10-20)A1.
5. The solar cell anisotropic tension printing template according to claim 4, characterized in that: The steel plate groove (4) is arranged along the scraping direction of the scraper; the material-containing groove (7) is a sloping bottom groove.
6. The solar cell anisotropic tension printing template according to claim 1, 2 or 3, characterized in that: The shape of the friction-enhancing block matches the cavity of the pit, and the top surface of the friction-enhancing block is a plane, which is located on the same plane as the surface of the printing plate (3).
7. The solar cell anisotropic tension printing template according to claim 1, 2 or 3, characterized in that: The shape of the friction-enhancing block matches the cavity of the pit, and the top surface of the friction-enhancing block is an arc surface, the vertex of which is higher than the upper surface of the printing plate (3).
8. The solar cell anisotropic tension printing template according to claim 1, 2 or 3, characterized in that: The pit of the friction-increasing damping point (5) is circular, rectangular or triangular; the depth of the pit of the friction-increasing damping point (5) is h2, the thickness of the printing plate (3) is h1, and h2 = (2 / 5-3 / 5)h1.