Photovoltaic cell printing steel plate with damping structure

Abstract

The photovoltaic cell printing steel plate with the damping structure comprises a printing plate frame and a printing steel plate body, the printing steel plate body is tensioned on the printing plate frame through a tensioning wire drawing net, and a plurality of steel plate wire grooves and a plurality of friction increasing damping points are arranged on the plate face of the printing steel plate body. The steel plate wire duct comprises a material containing wire duct and a scraping and printing wire duct, and the scraping and printing wire duct is located at the bottom of the material containing wire duct. The friction-increasing damping points are distributed on the two sides of the steel plate wire groove, and each friction-increasing damping point comprises a pit formed in the printing steel plate and a friction-increasing block filled in the pit. The steel plate wire groove is arranged in the scraping and printing direction of the scraper. The material containing wire groove is a flat bottom groove. The shape of the friction increasing block is matched with that of a pit cavity of the pit, the top face of the friction increasing block is a plane or an arc-shaped face, and the pit of the friction increasing damping point is round or rectangular or triangular. According to the photovoltaic cell printing steel plate, the surface friction damping force of the steel plate can be effectively enhanced so as to control stable movement of a scraping and printing knife, and accurate printing of electrode grid lines is achieved.

Description

Technical Field

[0001] This utility model relates to a printing template for fine conductive grid lines of solar photovoltaic cells, and more particularly to a printing template structure for a thin metal substrate. Background Technology

[0002] To improve the power generation efficiency of solar cells, the electrode grid lines on photovoltaic cells must be thin and high, achieving an ideal height-to-width ratio. However, the structure and manufacturing process of traditional screen printing stencils have reached their limits, making further breakthroughs difficult. Therefore, in recent years, photovoltaic cell printing stencils using thin metal substrates instead of metal screens have emerged. These stencils eliminate the knots formed by the alternating warp and weft threads of traditional screens, significantly increasing the opening ratio of the printing template, improving ink penetration, and effectively reducing manufacturing costs. This facilitates the miniaturization of the battery grid electrodes.

[0003] Because of the interlacing warp and weft threads forming knots in screen printing stencils, while these knots significantly affect the ink permeability of the stencil, they also create frictional damping during the squeegee's application. This frictional damping not only effectively controls and stabilizes the squeegee's movement, promoting even pressure on the ink, but also enhances the downward pressure on the ink, further improving ink permeability. In contrast, the thin metal substrate of printing plates, with its smooth surface, does not exhibit the knot problem, but it also lacks the frictional damping effect on the moving squeegee. This makes it difficult to control the smooth movement of the squeegee's application port, hindering even pressure on the printing ink and making it difficult to form complete, uniformly thick electrode grid lines. Furthermore, it weakens the squeegee's pressure on the ink, negatively impacting the stencil's ink permeability, especially noticeable in printing fine electrode grid lines. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a photovoltaic cell printing steel plate with a damping structure that can effectively enhance the frictional damping force of the steel plate surface, so as to achieve precise printing of electrode grid lines.

[0005] To solve the above-mentioned technical problems, the present invention provides a photovoltaic cell printing steel plate with a damping structure, 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 surface of the printing steel plate 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 printing grooves, with the printing 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 set on the printing steel plate and a friction-increasing block filled in the pit.

[0006] In the above structure, several friction-increasing damping points are set on the surface of the printing plate. The friction-increasing blocks in these points can generate a certain damping force on the squeegee during the squeegee movement. This damping effect generated by friction can effectively control and stabilize the squeegee movement, preventing the squeegee from slipping or jerking 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 enhancing the balanced ink penetration effect. Furthermore, since the plate groove includes a material-containing groove and a squeegee groove, and the squeegee groove is located at the bottom of the material-containing groove, a stepped opening material-containing structure is formed. In this way, when the squeegee is squeegeeing, the ink in the material-containing groove cavity can be printed onto the printing substrate through the squeegee groove with a certain printing pressure. 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.

[0007] In a preferred embodiment of this invention, the width of the squeegee groove is A1, which is between 0.008mm and 0.015mm; the width of the material-containing groove is A2, where A2 = (10-20)A1. The steel plate groove is arranged along the squeegee printing direction; the material-containing groove is a flat-bottomed groove. This effectively enhances the penetration of the printing silver paste and the accuracy of the printing grid lines.

[0008] In a preferred embodiment of this invention, the shape of the friction-enhancing block matches the cavity of the recess, and the top surface of the friction-enhancing block is a plane, which lies on the same plane as the surface of the printing plate. This provides stable damping and is easy to manufacture.

[0009] In a preferred embodiment of this invention, the shape of the friction-enhancing block matches the cavity of the recess, and the top surface of the friction-enhancing block is an arc-shaped surface, the apex of which is higher than the upper surface of the printing plate. This not only provides stable damping but also enhances the squeezing effect of the doctor blade on the slurry.

[0010] In a preferred embodiment of this invention, the recess of the friction-enhancing damping point is circular, rectangular, or triangular; the depth of the recess of the friction-enhancing damping point is h2, and the thickness of the printing plate is h1, where h2 = (2 / 5 - 3 / 5)h1. This effectively improves the adhesion of the friction-enhancing block to the printing plate.

[0011] In a preferred embodiment of this invention, the tensioning wire mesh is a polyester wire mesh; the printing plate is a thin metal plate with a thickness h1 of 0.01mm-0.03mm. This effectively controls the springback of the printing plate during the printing process. Attached Figure Description

[0012] The photovoltaic cell printing plate with damping structure of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0013] 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;

[0014] Figure 2 yes Figure 1 A cross-sectional structural diagram of the embodiment shown;

[0015] Figure 3 yes Figure 1 An enlarged structural schematic diagram of the steel plate groove A-A section in the embodiment shown;

[0016] 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.

[0017] Figure 5 yes Figure 1 An enlarged view of another specific structure of the friction-increasing damping point B-B section in the embodiment shown.

[0018] 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

[0019] like Figure 1 , Figure 2 The photovoltaic cell printing plate shown has a damping structure. The printing plate frame 1 is a square frame made of aluminum alloy. A window for stretching the printing plate 3 and the tensioning wire mesh 2 is located at the center of the printing plate frame 1. The printing 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 plate 3 and the inner edge of the window of the tensioning wire mesh 2 are bonded together with adhesive. The tensioning wire mesh 2 is a U-shaped polyester wire mesh. The printing plate 3 is a square stainless steel sheet with a thickness of h1 = 0.026 mm, preferably h1 = 0.01 mm-0.03 mm. The printing plate 3 can also be other metal sheets.

[0020] 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 consistent with the scraping and pressing direction of the squeegee, that is, the scraping and pressing direction of the squeegee is along the longitudinal direction of the grooves 4 to achieve the printing of the paste. Several friction-increasing damping points 5 are densely distributed in the area where the grooves 4 are located.

[0021] Figure 3A magnified cross-sectional view of the steel plate groove 4 is shown, with the thickness of the printing steel plate 3 being h1 = 0.026 mm. The steel 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 of the squeegee groove 6 is A1 = 8 μm, and the material-containing groove 7 is a flat-bottomed groove with a groove width A2 = 120 μm; the groove depth of the material-containing groove 7 is h2 = 0.013 mm. Preferably, A2 = (10-20)A1, and h2 = (2 / 5-3 / 5)h1.

[0022] Figure 4 An 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.

[0023] 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.

[0024] 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 photovoltaic cell printing steel plate having a damping structure, comprising a printing plate frame (1) and a printing steel plate (3), the printing steel plate (3) being tensioned on the printing plate frame (1) by a tension wire net (2), characterized in that: The printing steel plate (3) is provided with a plurality of steel plate line grooves (4) and a plurality of frictional damping points (5) on the plate surface; the steel plate line groove (4) comprises a material containing line groove (7) and a scraping line groove (6), and the scraping line groove (6) is located at the bottom of the material containing line groove (7); the frictional damping points (5) are distributed on both sides of the steel plate line groove (4), and the frictional damping points (5) comprise a pit provided on the printing steel plate (3) and a frictional block filled in the pit.

2. The photovoltaic cell printing steel plate having a damping structure according to claim 1, characterized by: The groove width A1 of the scraping line groove (6) is between 0.008mm and 0.015mm; the groove width of the material containing line groove (7) is A2, and A2=(10-20)A1.

3. The photovoltaic cell printing steel plate having a damping structure according to claim 1 or 2, characterized in that: The steel plate line groove (4) is arranged along the scraping direction of the scraper; the material containing line groove (7) is a flat-bottomed groove.

4. The photovoltaic cell printing steel plate having a damping structure according to claim 1, wherein: The shape of the frictional block is consistent with the pit cavity of the pit, the top surface of the frictional block is a plane, and the top surface and the surface of the printing steel plate (3) are located on the same plane.

5. The photovoltaic cell printing steel plate having a damping structure according to claim 1, wherein: The shape of the frictional block is consistent with the pit cavity of the pit, the top surface of the frictional block is an arc surface, and the vertex of the arc surface is higher than the upper surface of the printing steel plate (3).

6. The photovoltaic cell printing steel plate having a damping structure according to claim 1, 4 or 5, characterized in that: The pit of the frictional damping point (5) is circular or rectangular or triangular; the pit depth of the frictional damping point (5) is h2, the thickness of the printing steel plate (3) is h1, and h2=(2 / 5-3 / 5)h1.

7. The photovoltaic cell printing steel plate having a damping structure according to claim 1, wherein: The tensioned wire mesh (2) is a polyester wire mesh; the printing steel plate (3) is a metal sheet, and the thickness h1 of the printing steel plate (3) is 0.01mm-0.03mm.

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