Screen printing plate capable of increasing printing height of local opening

Abstract

The invention relates to a printing technology capable of increasing the local height, and relates to the technical field of solar cell panel manufacturing, in particular to a solar cell panel and the printing technology capable of increasing the local height. The solar cell panel comprises a printing substrate, a plurality of main grids and fine grids are arranged on the surface of the printing substrate, the main grids and the fine grids have intersections, and basic slurry layers are arranged at the intersections. The reason that the thickness of a specific area needs to be increased locally (generally at the junction of a main grid and a fine grid) is that high-temperature welding needs to be carried out during electrode welding in the future, and the junction is fused with a certain probability, so that the strength of the corresponding area needs to be increased. In the process of printing the main grid and the fine grid on the printing substrate, the basic slurry layer is arranged at the intersection of the main grid and the fine grid for heightening and thickening, so that the fusing condition during subsequent welding can be effectively reduced, and the product quality is improved.

Description

Technical Field

[0001] The present application relates to the field of solar panel screen printing, and in particular to a screen and printing process capable of increasing the local height. Background Art

[0002] Screen printing is mainly used in the manufacture of solar panels. By printing conductive silver paste, the voltage of the solar panel is collected and output. Screen printing allows the conductive silver paste to be accurately covered on the anode of the solar cell and connect the anode to the cell, improving the efficiency of the cell.

[0003] In the related art, the texture after printing on the substrate usually includes fine grids and main grids. The fine grids are arranged horizontally and their function is to collect current. The main grids are arranged vertically and have intersections with several fine grids. Their function is to connect the currents of several fine grids in series to form solar power generation. The traditional printing method is to place the printing screen on the substrate, the conductive silver paste is located on the surface of the printing screen, and the surface of the printing screen is pressed down and scraped with a scraper, so that the conductive silver paste can be squeezed through the mesh holes of the graphic part of the printing screen to the surface of the substrate to form the required graphics (i.e., main grid and fine grid).

[0004] The above-mentioned related technologies have the following defects: in the future, high-temperature welding will be required during the electrode welding process, and there is a certain probability that the intersection of the main grid and the fine grid will be melted, affecting the electrical performance and reliability of the solar cell panel, so it needs to be improved. Summary of the invention

[0005] In order to improve the problem that the intersection of the main grid and the fine grid is easily melted during the high-temperature welding process, the present application provides a solar cell panel and a screen and printing process that can increase the local height.

[0006] The solar panel provided in this application adopts the following technical solution: A solar cell panel comprises a printing substrate, wherein a plurality of main grids and a plurality of fine grids are arranged on the surface of the printing substrate, the main grids and the fine grids have intersections, and a base slurry layer is arranged on the printing substrate at the intersections.

[0007] By adopting the above technical solution, a base slurry layer is set on the printed substrate at the intersection of the main grid and the fine grid, increasing the height and thickness of this area. This not only improves the mechanical strength of the intersection of the main grid and the fine grid, but also effectively reduces the probability of melting at the intersection during the subsequent high-temperature welding process, thereby significantly improving the overall quality and reliability of the solar panel.

[0008] A printing process capable of increasing local height, comprising: Pre-filling stage: a layer of conductive silver paste is pre-coated at the intersection of the main grid and the fine grid of the substrate, and then dried and cooled to form a solidified base paste layer; Formal printing stage: Place the grid line screen on the surface of the pre-filled printing substrate, use a scraper to print the main grid and fine grid, and make the intersection of the main grid and fine grid located above the base slurry layer.

[0009] By adopting the above technical solution, a layer of conductive silver paste is pre-coated at the intersection of the main grid and the fine grid of the printing substrate in the pre-filling stage and solidified to form a base paste layer, which can ensure that the thickness of the base paste layer at the intersection of the main grid and the fine grid is sufficient in the subsequent formal printing stage, thereby improving the mechanical strength of this area. This not only reduces the risk of melting at the intersection of the main grid and the fine grid during high-temperature welding, but also improves the overall quality and reliability of the solar panel.

[0010] Preferably, the base slurry layer is in a board shape.

[0011] By adopting the above technical solution, the basic slurry layer design of the board type can form a large area of ​​conductive silver paste coating in the pre-filling stage, thereby ensuring that the silver paste thickness at the intersection of the main grid and the fine grid is more uniform and sufficient. This not only improves the overall strength of the intersection, but also enhances the stability of the basic slurry layer itself, effectively reducing the risk of melting during subsequent welding, thereby improving the quality and reliability of the product.

[0012] Preferably, the base slurry layer is frame-shaped.

[0013] By adopting the above technical solution, the frame-shaped base paste layer only generates the frame boundary in the pre-filling stage, and then fills the conductive silver paste inside the frame boundary in the formal printing stage. The advantages of this design are: 1. The conductive silver paste material used in the pre-filling stage can be different from that in the formal printing stage, because the frame boundary is mainly used to limit the conductive silver paste in the formal printing process, which increases the flexibility of material selection.

[0014] 2. During the formal printing process, the center of the base paste layer is generated together with the main grid and the fine grid, and is formed as one piece, so that the connection stability between the base paste layer and the intersection of the main grid and the fine grid is higher, reducing the risk of melting during welding.

[0015] Preferably, the base slurry layer is sloped.

[0016] By adopting the above technical solution, the base slurry layer is designed to be sloped, and a single strip structure can be generated on the side of the intersection of the main grid and the fine grid during the pre-filling stage. During the formal printing stage, after the scraper contacts the sloped base slurry layer, the scraper is lifted up, and under the action of inertia, it does not immediately contact the grid line screen. Therefore, during this period of time, the main part of the base slurry layer can be generated together with the main grid and the fine grid, and formed into one piece, so that the connection stability between the base slurry layer and the intersection of the main grid and the fine grid is higher. In addition, the average height of the base slurry layer can be adjusted by controlling the height of the sloped base slurry layer, and the width of the base slurry layer can be adjusted by controlling the speed of the scraper, which has the effect of facilitating convenient adjustment during the production process.

[0017] A printing process capable of increasing local height, comprising: Grid line screen processing stage: the grid line screen has a main grid printing area and a fine grid printing area, the main grid printing area and the fine grid printing area have an intersection, and a base printing area is arranged at the bottom of the intersection of the main grid printing area and the fine grid printing area; Formal printing stage: Place the grid line screen on the surface of the printing substrate, use a scraper to print the main grid and fine grid, and during the printing process, the conductive silver paste automatically fills the base printing area and is finally dried and cooled to form a base paste layer.

[0018] By adopting the above technical solution, a base printing area is horizontally extended at the bottom of the intersection of the main grid printing area and the fine grid printing area during the grid line screen processing stage, so that in the formal printing stage, the conductive silver paste can automatically fill the base printing area and finally dry and cool to form a basic paste layer. This design can not only increase the paste thickness at the intersection of the main grid and the fine grid, improve the mechanical strength of this area, but also integrate the basic paste layer with the main grid and the fine grid to enhance the connection stability, thereby effectively reducing the risk of melting at the intersection of the main grid and the fine grid during the subsequent welding process, and improving the quality and reliability of the product.

[0019] Preferably, the grid line screen includes an upper screen and a lower screen connected to each other, the upper screen has a main grid printing area and a fine grid printing area, and the main grid printing area and the fine grid printing area have an intersection; the lower screen has a main grid printing area and a fine grid printing area, the main grid printing area and the fine grid printing area have an intersection, and a base printing area is provided at the intersection.

[0020] By adopting the above technical solution, the grid line screen includes an upper screen and a lower screen connected to each other, the upper screen has a main grid printing area and a fine grid printing area, and the main grid printing area and the fine grid printing area have an intersection; the lower screen has a main grid printing area and a fine grid printing area, the main grid printing area and the fine grid printing area have an intersection, and a base printing area is arranged at the intersection. This design realizes the integrated molding of the base printing area, the main grid printing area and the fine grid printing area through a double-layer screen, which improves the convenience of production and processing and improves production efficiency.

[0021] Preferably, the scraper comprises a body and an elastic cushion layer covering the bottom of the body, and the outer side wall of the cushion layer is provided with a liquid storage groove.

[0022] By adopting the above technical solution, the elastic cushion layer can use its certain deformation performance to better fit various parts of the grid line screen during the formal printing process. For example, when the elastic cushion layer contacts the grid line screen above several base slurry layers in the same row, the elastic cushion layer located directly above the base slurry layer can be squeezed and contracted, while the elastic cushion layer located in the middle of two adjacent base slurry layers can cross the limitation of the base coating and squeeze the grid line screen downward to better press the grid line screen against the printing substrate. In this way, the printing of the main grid and the fine grid in the ordinary area and the printing of the intersection of the main grid and the fine grid in the heightened area can be completed simultaneously during one scraping process of the scraper. In addition, the design of the liquid storage tank allows the conductive silver paste in the liquid storage tank to be injected into the base printing area under pressure by pressing down when the scraper passes the intersection of the main grid and the fine grid during the formal printing stage, thereby improving the filling efficiency and fullness of the conductive silver paste injected into the base printing area, and effectively ensuring the quality of the final base slurry layer.

[0023] Preferably, during the formal printing stage, the lower side of the liquid storage tank is in contact with the grid line screen. When the scraper passes through the intersection of the main grid and the fine grid, the scraper is pressed down so that the upper side of the liquid storage tank is also in contact with the grid line screen. Thereafter, the scraper continues to be pressed down so that the conductive silver paste in the liquid storage tank is injected into the base printing area under pressure.

[0024] By adopting the above technical solution, the design of the liquid storage tank enables the conductive silver paste to be more efficiently filled into the base printing area under pressure, ensuring the full formation of the base paste layer. This improvement not only improves the filling and quality of the base paste layer, but also enhances the overall stability of the intersection of the main grid and the fine grid, further reducing the risk of melting during high-temperature welding, thereby significantly improving the reliability and service life of the product.

[0025] Preferably, the main body has a support plate, the support plate has a clearance hole, the elastic cushion layer has an adjustment rod, the adjustment rod is penetrated by the clearance hole, the adjustment rod is threadedly sleeved with a pair of locking nuts, and the two locking nuts are respectively pressed against the two sides of the support plate.

[0026] By adopting the above technical solution, the position of the elastic cushion layer of the scraper relative to the main body can be flexibly adjusted. The elastic cushion layer can be moved up and down by loosening the locking nut. After the adjustment is completed, the locking nut is tightened to fix the position, thereby achieving the stability of the relative position relationship between the elastic cushion layer and the main body. This design not only facilitates the installation and replacement of the elastic cushion layer, but also can adjust the deformation capacity of the elastic cushion layer according to different needs during actual use, so that it can better adapt to the surface changes of the grid line screen under different working conditions, ensure the uniform application of the conductive silver paste, and improve the printing quality and efficiency. At the same time, the design of the adjustment rod enables the deformation of the elastic cushion layer to be accurately controlled within a certain range, further improving the flexibility and applicability of the equipment.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. Setting a base paste layer at the intersection of the main grid and the fine grid significantly enhances the thickness and mechanical strength of the conductive silver paste in this area, effectively reduces the risk of melting during high-temperature welding, and improves the reliability and durability of the product.

[0028] 2. In the pre-filling stage, a layer of conductive silver paste is pre-coated and cured at the intersection of the main grid and the fine grid of the printing substrate, and then conventional printing is performed in the formal printing stage, ensuring that the base paste layer at the intersection of the main grid and the fine grid is more solid, thereby improving the yield and product quality.

[0029] 3. Various shapes of base slurry layer designs (plate type, frame type, slope type) can be flexibly selected according to different production and process requirements, which not only ensures the stability and reliability of the intersection, but also facilitates adjustment and optimization during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of Example 1 of the present application; Figure 2 for Figure 1 Cross-sectional view along AA direction; Figure 3 This is a schematic diagram of the structure of Example 2 of the present application; Figure 4 for Figure 3 Cross-sectional view along direction BB; Figure 5 This is a schematic diagram of the structure of Example 3 of the present application; Figure 6 for Figure 5 Cross-sectional view along CC direction; Figure 7 This is a structural diagram for reflecting the connection relationship between the upper screen and the lower screen in Example 4 of the present application; Figure 8This is a structural schematic diagram for reflecting the connection relationship between the base slurry layer and the main grid and fine grid in Example 4 of the present application; Fig. 9 for Figure 8 Cross-sectional view along DD direction; Fig.10 This is a structural schematic diagram used to illustrate the connection relationship between the scraper body and the elastic cushion layer in Example 4 of the present application.

[0031] In the figure: 1. Printing substrate; 11. Main grid; 12. Fine grid; 13. Base slurry layer; 2. Grid line screen; 201. Upper screen; 202. Lower screen; 21. Main grid printing area; 22. Fine grid printing area; 23. Base printing area; 3. Scraper; 31. Main body; 32. Elastic cushion; 33. Support plate; 34. Clearance hole; 35. Adjustment rod; 36. Locking nut. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0033] The inventor of the present application has found that in the related art, the texture after printing on the substrate usually includes a fine grid and a main grid. The fine grid is arranged horizontally, and its function is to collect current. The main grid is arranged vertically and has an intersection with several fine grids. Its function is to connect the currents of several fine grids in series to form solar power generation. The traditional printing method is to place the printing screen above the substrate, and the conductive silver paste is located on the surface of the printing screen. The surface of the printing screen is pressed down and scraped with a scraper, so that the conductive silver paste can be squeezed through the mesh of the graphic part of the printing screen to the surface of the substrate to form the required pattern (i.e., the main grid and the fine grid). The above-mentioned related technology has the following defects: in the future, high-temperature welding will be required during the electrode welding process, and there is a certain probability that the intersection of the main grid and the fine grid will be melted, so it needs to be improved. To this end, the present application mainly adopts the following 'pre-filling stage' and 'formal printing stage' methods, which significantly increases the thickness of the conductive silver paste at the intersection of the main grid and the fine grid, thereby effectively reducing the chances of melting during subsequent welding, thereby improving product quality. The present application is further described in detail below.

[0034] Example 1 Reference Figure 1 and Figure 2The embodiment of the present application provides a solar cell panel, including a substrate 1, a plurality of main grids 11 and a plurality of fine grids 12 are arranged on the surface of the substrate 1, the plurality of main grids 11 are parallel to each other, the plurality of fine grids 12 are parallel to each other, the main grids 11 and the fine grids 12 are arranged vertically and have an intersection. The substrate 1 is provided with a base slurry layer 13 at the intersection, and the base slurry layer 13 can be completed by a dispensing machine or other precision spraying equipment to ensure that the coating is evenly distributed, and then cured by drying to form a final cured base slurry layer 13. Commonly used conductive silver paste materials include nano silver particles and organic solvent mixtures, which have moderate viscosity and are easy to spray or apply. The width of the plate-type base slurry layer 13 is greater than the actual size of the intersection of the main grid 11 and the fine grid 12 to ensure sufficient coverage area. By providing the base slurry layer 13 at the intersection of the main grid 11 and the fine grid 12, the thickness of the conductive silver paste in this area can be significantly increased, thereby effectively reducing the risk of melting during high-temperature welding, thereby improving the quality and reliability of the product.

[0035] This embodiment also provides a printing process for increasing the local height, including the following stages: Pre-filling stage: A large area of ​​conductive silver paste is pre-coated at the intersection of the main grid 11 and the fine grid 12 of the substrate 1, and then dried and cooled to form a solidified base paste layer 13. In this embodiment, the base paste layer 13 is a plate-shaped structure. The advantage of this design is that it can ensure that there is enough silver paste thickness at the intersection of the main grid 11 and the fine grid 12, thereby enhancing its heat resistance and mechanical strength.

[0036] Formal printing stage: Place the grid line screen on the surface of the pre-filled printing substrate 1, use the scraper 3 to print the main grid 11 and the fine grid 12, and make the intersection of the main grid 11 and the fine grid 12 located above the base slurry layer 13. The intersection of the main grid 11 and the fine grid 12 is heightened and thickened in advance at the predetermined position by printing multiple times, so that the slurry at the intersection of the main grid 11 and the fine grid 12 can be thicker when the main grid 11 and the fine grid 12 are formally printed.

[0037] Example 2 Reference Figure 3 and Figure 4, the difference between this embodiment and the above-mentioned embodiment 1 lies in the specific form of the base slurry layer 13. Specifically, the base slurry layer 13 is frame-shaped. The design of the frame-shaped base slurry layer 13 requires only generating a frame-shaped boundary in the pre-filling stage, and then filling the inside of the frame-shaped boundary with conductive silver paste in the formal printing stage. The advantage of this design is that the material of the conductive silver paste used in the pre-filling stage can be different from that used in the formal printing stage, because its frame-shaped boundary is only to limit the conductive silver paste in the formal printing process. Moreover, in this way, during the formal printing process, the center of the base slurry layer 13 is generated together with the main grid 11 and the fine grid 12, and is formed as one piece, so that the connection stability between the base slurry layer 13 and the intersection of the main grid 11 and the fine grid 12 is higher. During printing, the pressure and speed of the scraper 3 need to be appropriately adjusted to ensure that the conductive silver paste can smoothly fill the inside of the frame and finally form an integrated structure.

[0038] Example 3 Reference Figure 5 and Figure 6 , the difference between this embodiment and the aforementioned embodiment 1 lies in the specific form of the base slurry layer 13. Specifically, the base slurry layer 13 is slope-shaped. The design of the slope-shaped base slurry layer 13 requires that a single strip-shaped structure be generated on the side of the intersection of the main grid 11 and the fine grid 12 during the pre-filling stage. During the formal printing stage, after the scraper 3 contacts the slope-shaped base slurry layer 13, the scraper 3 is lifted, and because the scraper 3 has a certain movement speed, it will not immediately drop to contact the grid line screen under the action of inertia. Therefore, during this period of time, the main part of the base slurry layer 13 can be generated together with the main grid 11 and the fine grid 12, and formed as one piece, so that the connection stability between the base slurry layer 13 and the intersection of the main grid 11 and the fine grid 12 is higher. In addition, in order to control the average height of the base slurry layer 13, it can be adjusted by controlling the height of the slope-shaped base slurry layer 13, and in order to control the width of the base slurry layer 13, it can be adjusted by controlling the speed of the scraper 3, which has the effect of being able to be easily adjusted during the production process. The design of the slope structure can effectively disperse the pressure of the scraper 3 and avoid excessive local stress concentration, thereby improving the stability and consistency of the entire structure.

[0039] Example 4 Reference Figure 7 , Figure 8 and Fig. 9 This embodiment provides another printing process that can improve the local height. The difference from the above-mentioned embodiment 1 is that a special grid line screen 2 design and a special scraper 3 design are used. Specifically: Reference Figure 7The grid line screen 2 has a main grid 11 printing area and a fine grid 12 printing area. The main grid 11 printing area and the fine grid 12 printing area have an intersection. The bottom of the intersection of the main grid 11 printing area and the fine grid 12 printing area is horizontally extended to provide a base printing area 23. Through this design, the base slurry layer 13 can be automatically filled in the formal printing process, thereby simplifying the process and improving production efficiency.

[0040] The grid line screen 2 can be divided into two parts: an upper screen 201 and a lower screen 202, wherein: The upper screen 201 has a main grid 11 printing area and a fine grid 12 printing area. The main grid 11 printing area and the fine grid 12 printing area have an intersection. The upper screen 201 is mainly used for printing the main grid 11 and the fine grid 12. Its structure is similar to that of a traditional screen. The main grid 11 printing area and the fine grid 12 printing area of ​​the upper screen 201 are both provided with high-precision meshes to ensure uniform distribution of the conductive silver paste.

[0041] Specific structure: The upper screen 201 is woven with high-tension stainless steel wire, with a mesh density of 325 meshes and a mesh diameter of about 40μm. In order to ensure high-precision printing, the upper screen 201 also needs to be treated with chemical nickel plating to improve its wear resistance and corrosion resistance.

[0042] The lower screen 202 also has a main grid 11 printing area and a fine grid 12 printing area. A base printing area 23 is set at the intersection of the main grid 11 printing area and the fine grid 12 printing area, which is specifically used for filling the base slurry layer 13. The mesh of the base printing area 23 is slightly larger than the mesh of the main grid 11 printing area and the fine grid 12 printing area of ​​the upper screen 201, so that the conductive silver paste can better flow into the base printing area 23 and fully fill it.

[0043] Specific structure: The lower screen 202 is also woven with high-tension stainless steel wire, but the mesh density is lower, 250 mesh, and the mesh diameter is about 60 μm. The base printing area 23 of the lower screen 202 is designed to be square to ensure a good filling effect.

[0044] The final structure reference after printing Figure 8 and Fig. 9 As shown, the difference between the printing process of this embodiment and that of embodiment 1 is that the function of the base slurry layer 13 is mainly to widen and increase the slurry area during subsequent welding, and the thickness of the main grid 11 and the fine grid 12 during the printing process is also increased compared to embodiment 1.

[0045] Reference Fig.10The scraper 3 includes a body 31 and an elastic cushion layer 32 covering the bottom of the body 31. Specifically, the elastic cushion layer 32 is made of a highly elastic silicone material with excellent resilience and wear resistance. The selection of the specific silicone material should not only consider its physical properties, but also its chemical stability to ensure that it will not react with the conductive silver paste.

[0046] The elastic cushion layer 32 can be deformed freely within a certain range to adapt to printing areas of different heights. This design of the elastic cushion layer 32 allows the scraper 3 to complete the printing of the ordinary area and the heightened area at the same time during one scraping process, thereby improving work efficiency. The outer wall of the cushion layer is provided with a liquid storage groove 320, which is a pair of liquid storage grooves 320, respectively located on the two outer walls of the cushion layer that are separated from each other, so that the liquid storage groove 320 can be used when the scraper 3 scrapes back and forth. The liquid storage groove 320 is used to store additional conductive silver paste. During the actual scraping process, the opening of the liquid storage groove 320 faces downward to facilitate the outflow of the conductive silver paste. During the formal printing process, when the scraper 3 passes the intersection of the main grid 11 and the fine grid 12, it only needs to be gently pressed down to allow the conductive silver paste in the liquid storage groove 320 to be quickly injected into the base printing area 23, achieving efficient and stable quality filling.

[0047] In order to further improve the operational convenience and adjustment flexibility of the scraper 3, the present embodiment also introduces an adjustable design. Specifically, the side wall of the main body 31 is integrally formed with a support plate 33, and the support plate 33 is made of high-strength aluminum alloy material, which has the characteristics of light weight and high rigidity. The support plate 33 is provided with a clearance hole 34, and the end of the elastic cushion layer 32 is also fixedly provided with an adjustment rod 35, which passes through the clearance hole 34 and can slide up and down. The outer threaded sleeve of the adjustment rod 35 is provided with a pair of locking nuts 36, and the two locking nuts 36 are respectively pressed against the upper and lower sides of the support plate 33. By loosening the locking nut 36, the position of the elastic cushion layer 32 relative to the main body 31 can be easily adjusted, thereby changing its deformation ability and realizing the adjustment of the degree of "softness and hardness".

[0048] In summary, by optimizing the design of the scraper 3, not only can the printing of the ordinary area and the heightened area be completed simultaneously in one scraping process, but the hardness of the scraper 3 can also be flexibly adjusted according to actual needs, thereby meeting the printing requirements under different working conditions. This design greatly improves the flexibility and adaptability of the production process, which is conducive to improving product quality and production efficiency.

[0049] Based on the special design of the scraper 3, the printing process of this embodiment is as follows: In the formal printing stage, the lower side of the liquid storage tank 320 contacts the grid line screen 2. When the scraper 3 passes the intersection of the main grid 11 and the fine grid 12, the scraper 3 is pressed down so that the upper side of the liquid storage tank 320 also contacts the grid line screen 2. Thereafter, the scraper 3 continues to be pressed down so that the conductive silver paste in the liquid storage tank 320 is injected into the base printing area 23 under pressure. The filling efficiency and filling degree of the conductive silver paste injected into the base printing area are improved, and the quality of the final base paste layer 13 is effectively guaranteed. In addition, during the formal printing process, the elastic cushion layer 32 can utilize its deformation performance within a certain range to better fit various parts of the grid line screen 2. For example, when the elastic cushion layer 32 contacts the grid line screen 2 above several base slurry layers 13 in the same row, the elastic cushion layer 32 located directly above the base slurry layer 13 can be squeezed and contracted, and the elastic cushion layer 32 located in the middle of two adjacent base slurry layers 13 can exceed the limitation of the base coating and squeeze the grid line screen 2 downward to better press the grid line screen 2 against the printing substrate 1, so that the printing of the main grid 11 and the fine grid 12 in the ordinary area can be completed in one scraping process of the scraper 3, and the printing of the intersection of the main grid 11 and the fine grid 12 in the increased area can be completed.

[0050] The implementation principle of this embodiment is: during the formal printing process, the elastic cushion layer 32 can utilize its deformation performance within a certain range to better fit various parts of the grid line screen 2. For example, when the elastic cushion layer 32 contacts the grid line screen 2 above several base slurry layers 13 in the same row, the elastic cushion layer 32 located directly above the base slurry layer 13 can be squeezed and contracted, and the elastic cushion layer 32 located in the middle of two adjacent base slurry layers 13 can exceed the limitation of the base coating and squeeze the grid line screen 2 downward to better press the grid line screen 2 against the printing substrate 1, so that the printing of the main grid 11 and the fine grid 12 in the ordinary area can be completed in one scraping process of the scraper 3, and the printing of the intersection of the main grid 11 and the fine grid 12 in the increased area can be completed.

[0051] The scraper and printing process of this embodiment can also be applied to Embodiment 1, Embodiment 2, and Embodiment 3 in actual use, and are not limited to Embodiment 4.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A solar cell panel, characterized in that: The printing substrate (1) comprises a printing substrate (1), wherein a plurality of main grids (11) and a plurality of fine grids (12) are arranged on the surface of the printing substrate (1), wherein the main grids (11) and the fine grids (12) have an intersection, and a base slurry layer (13) is arranged on the printing substrate (1) at the intersection.

2. A printing process capable of increasing local height, characterized in that: include: Pre-filling stage: pre-coating a layer of conductive silver paste at the intersection of the main grid (11) and the fine grid (12) of the printing substrate (1), drying and cooling to form a solidified base paste layer (13); Formal printing stage: placing the grid line screen (2) on the surface of the pre-filled printing substrate (1), using a scraper (3) to print the main grid (11) and the fine grid (12), and making the intersection of the main grid (11) and the fine grid (12) located above the base slurry layer (13).

3. A printing process capable of increasing local height according to claim 2, characterized in that: The base slurry layer (13) is in a plate shape.

4. A printing process capable of increasing local height according to claim 2, characterized in that: The base slurry layer (13) is frame-shaped.

5. The printing process capable of increasing local height according to claim 2, characterized in that: The base slurry layer (13) is sloped.

6. A printing process capable of increasing local height, characterized in that: include: The grid line screen (2) processing stage: the grid line screen (2) has a main grid (11) printing area and a fine grid (12) printing area, the main grid (11) printing area and the fine grid (12) printing area have an intersection, and a base printing area (23) is arranged at the bottom of the intersection of the main grid (11) printing area and the fine grid (12) printing area extending laterally; Formal printing stage: placing the grid line screen (2) on the surface of the printing substrate (1), using a scraper (3) to print the main grid (11) and the fine grid (12), during the printing process, the conductive silver paste automatically fills the base printing area (23), and finally dries and cools to form a base paste layer (13).

7. A printing process capable of increasing local height according to claim 6, characterized in that: The grid line screen (2) comprises an upper screen (201) and a lower screen (202) connected to each other, wherein the upper screen (201) has a main grid (11) printing area and a fine grid (12) printing area, and the main grid (11) printing area and the fine grid (12) printing area have an intersection; the lower screen (202) has a main grid (11) printing area and a fine grid (12) printing area, and the main grid (11) printing area and the fine grid (12) printing area have an intersection, and a base printing area (23) is provided at the intersection.

8. The printing process capable of increasing local height according to claim 6, characterized in that: The scraper (3) comprises a body (31) and an elastic cushion layer (32) covering the bottom of the body (31), and a liquid storage groove (320) is provided on the outer side wall of the cushion layer.

9. A printing process capable of increasing local height according to claim 8, characterized in that: During the formal printing stage, the lower side of the liquid storage tank (320) contacts the grid line screen (2). When the scraper (3) passes the intersection of the main grid (11) and the fine grid (12), the scraper (3) is pressed downward so that the upper side of the liquid storage tank (320) also contacts the grid line screen (2). Thereafter, the scraper (3) continues to be pressed downward so that the conductive silver paste in the liquid storage tank (320) is injected into the base printing area (23) under the action of pressure.

10. The printing process capable of increasing local height according to claim 8, characterized in that: The body (31) has a support plate (33), the support plate (33) has a clearance hole (34), the elastic cushion layer (32) has an adjustment rod (35), the adjustment rod (35) is penetrated by the clearance hole (34), and the adjustment rod (35) is threadedly sleeved with a pair of locking nuts (36), and the two locking nuts (36) are respectively pressed against two sides of the support plate (33).

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