Screen printing plate for solar cell

Abstract

The utility model discloses a printing screen for a solar cell, and belongs to the technical field of solar cell production. The utility model provides a printing screen for a solar cell. The printing screen for the solar cell comprises a screen frame, a plurality of sheets and a connecting structure. The sheets are located in the screen frame, and each sheet is provided with at least one grid line printing opening; and the connecting structure is connected with the sheet and the screen frame, so that the grid line printing openings are arranged in the screen frame according to a target pattern. According to the printing screen plate for the solar cell, the printing screen plate is formed by connecting the multiple independent sheets through the connecting structures, each sheet is provided with at least one grid line printing opening, a printing medium can smoothly penetrate through the openings, printed grid lines are smoother and more uniform, the area of each opening steel sheet is smaller than that of a whole opening steel plate, and the printing efficiency is improved. The tension of the printing screen is enhanced, and the service life is prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of solar cell production, and in particular to a printing screen for solar cells. Background Art

[0002] Solar cells can convert solar energy into electrical energy without polluting the environment. Therefore, solar cells have developed rapidly as one of the core technologies in solar energy research.

[0003] At present, printing screens are usually used to print electrode patterns for solar cells. The fine grids of traditional screens are attached to the silk screen. The mesh nodes of the silk screen will block the screen from passing the slurry, resulting in ups and downs and widening of the grid lines after printing, affecting the electrical performance of the solar cell. The grid lines printed by full-opening steel plates are flat, but their service life is short. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a printing screen for solar cells, the printed grid lines are smoother and more uniform, the area of ​​each opening steel sheet is smaller than that of the entire opening steel plate, the tension of the printing screen is enhanced, and the service life is extended.

[0005] In a first aspect, the present application provides a printing screen for solar cells, comprising:

[0006] Screen frame;

[0007] A plurality of sheets are located in the screen frame, each sheet having at least one grid line printing opening;

[0008] The connecting structure is connected to the sheet and the screen frame so that each grid line printing opening is arranged in the screen frame according to the target pattern.

[0009] According to the printed screen for solar cells of the present application, the printed screen is formed by multiple independent sheets connected together by a connecting structure, each sheet has at least one grid line printing opening, the printing medium can pass through the opening smoothly, the printed grid lines are smoother and more uniform, and the area of ​​each opening steel sheet is smaller than that of the entire opening steel plate, which enhances the tension of the printing screen and extends its service life.

[0010] According to one embodiment of the present application, the sheet is provided with a plurality of connection holes, and each connection hole is arranged around the grid line printing opening.

[0011] According to an embodiment of the present application, the connection structure includes a connection line, and the connection line is connected to each connection hole and the screen frame.

[0012] According to an embodiment of the present application, the material of the connecting wire is polyester fiber, steel or tungsten.

[0013] According to an embodiment of the present application, the surfaces of each connecting hole and the gap areas between each sheet are covered with a blocking layer, and the blocking layer is used to block the printing medium from passing through.

[0014] According to an embodiment of the present application, the material of the blocking layer includes a photosensitive material or polyimide.

[0015] According to one embodiment of the present application, the diameter of each connection hole is 10um-15um, and the interval between each connection hole is 15um-50um.

[0016] According to one embodiment of the present application, the sheets are arranged in an array.

[0017] According to an embodiment of the present application, the length of each grid line printing opening is 100 mm-200 mm, the width of each grid line printing opening is 5 um-25 um, and the interval between each sheet arranged along the column direction is 0.5 mm-1 mm.

[0018] According to one embodiment of the present application, the material of the sheet is steel, nickel, aluminum, alloy or ceramic.

[0019] Additional aspects and advantages 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 present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic structural diagram of a printed screen for a solar cell provided in an embodiment of the present application;

[0022] Figure 2 This is one of the connection diagrams of the connection wire and the connection hole provided in the embodiment of the present application;

[0023] Figure 3 This is the second connection diagram between the connecting wires and the connecting holes provided in the embodiment of the present application.

[0024] Reference numerals:

[0025] Screen frame 1, sheet material 2, connection structure 3, grid line printing opening 4, connection hole 5. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0027] The following description relates to elements or components that are "connected" or "coupled" together. As used herein, "connection" may refer to an element / component being mechanically coupled to (or directly connected to) another element / component, and is not necessarily direct. Similarly, "coupling" may refer to an element / component being directly or indirectly coupled to (or directly or indirectly connected to) another element / component, and is not necessarily mechanical. However, it should be understood that although in one embodiment, two elements are described below as "connected", similar elements may be "coupled" in alternative embodiments, and vice versa. Therefore, although the schematic diagram shown here describes an exemplary arrangement of elements, additional intermediate elements, devices, parts or components may still exist in a practical embodiment.

[0028] Solar cells, with their unique conversion mechanism, convert solar energy directly into electrical energy. This process does not rely on energy sources that are harmful to the environment. Therefore, as a top priority in solar energy research, solar cells have developed rapidly and significantly.

[0029] In the production process of solar cells, printing of electrode patterns is a key step. At present, the industry generally adopts printing screen technology to achieve this step. However, the traditional screen design has some limitations, that is, its fine grid is directly attached to the screen, which causes the mesh of the screen to be blocked when the slurry penetrates, and then the grid lines after printing appear uneven and widened, which has a negative impact on the electrical performance of solar cells.

[0030] In order to overcome this problem, the full-opening steel plate printing technology came into being. This technology can ensure the flatness of the grid line and significantly improve the printing effect. However, it is worth noting that the full-opening steel plate has a small tension and a relatively short service life, which is a challenge currently faced by this technology.

[0031] Reference Figure 1 One embodiment of the present application provides a printing screen for solar cells, which includes: a screen frame 1, a plurality of sheets 2, and a connection structure 3. The sheets 2 are located in the screen frame 1, and each sheet 2 has at least one grid line printing opening 4; the connection structure 3 is connected to the sheets 2 and the screen frame 1, so that each grid line printing opening 4 is arranged in the screen frame 1 according to a target pattern.

[0032] The screen frame 1 is the supporting structure of the entire printing screen, and is mainly used to support and fix the internal sheet 2. The screen frame 1 is usually made of a corrosion-resistant, lightweight and strong material to ensure its durability and stability. The specific material of the screen frame 1 can be selected according to the actual application scenario and is not limited here. For example, the screen frame 1 can be made of hard alloy aluminum.

[0033] The shape and size of the screen frame 1 can be customized according to actual needs. The shape and size of the screen frame 1 are not limited here. For example, the screen frame 1 can be rectangular.

[0034] The sheet material 2 is usually made of a material with high strength, high stability, high wear resistance and high corrosion resistance. In some embodiments, the material of the sheet material 2 can be steel, nickel, aluminum, alloy or ceramic.

[0035] Steel material itself has high toughness and hardness, and has high durability and strength against wear and damage of printing equipment. The material of sheet 2 is steel, which can maintain its stability and durability during long-term and high-intensity printing, reducing replacement frequency and maintenance costs.

[0036] Nickel material has high strength, high wear resistance, high corrosion resistance, good ductility and plasticity, which enables nickel plates to maintain good performance in harsh environments such as high temperature and high pressure.

[0037] Nickel material has high strength, high wear resistance, high corrosion resistance, good ductility and plasticity, which enables nickel plates to maintain good performance in harsh environments such as high temperature and high pressure.

[0038] Aluminum sheet has good plasticity and processability, and can be processed by various forming, cutting, punching and other processing operations. This easy processability enables aluminum sheet to be easily made into printing screens of various shapes and sizes to meet different printing needs.

[0039] The alloy has the characteristics of low density, high strength, good molding and processing performance and excellent corrosion resistance. The alloy material can be used in printing screens that require high strength, light weight and good corrosion resistance.

[0040] Ceramic materials are corrosion-resistant, wear-resistant and high-temperature resistant and can be used in high-temperature printing scenarios.

[0041] As an example, the sheet 2 can be a steel sheet, which has excellent wear resistance, corrosion resistance, high temperature resistance, etc., and is not easy to deform and age after long-term use, ensuring the stability and durability of printing. The specific material of the sheet 2 can be selected according to the actual application scenario and is not limited here.

[0042] The sheet 2 is located in the screen frame 1, and the grid line printing opening 4 is mainly used to allow the slurry to pass through during the printing process, which can optimize the flow and distribution of the slurry during the printing process, making the grid lines of the printed product smoother and more uniform. The design of the grid line printing opening 4 is optimized according to specific printing requirements and pattern design to adapt to different printing scenarios.

[0043] The connection structure 3 is used to achieve the connection between the sheets 2. The connection structure 3 fixes the sheets 2 together according to the target pattern, so that the grid line printing openings 4 can be arranged in the screen frame 1 according to the target pattern, and the electrode pattern can be accurately printed, ensuring the stability and durability of the printing screen, and improving the electrical performance of the solar cell.

[0044] The specific type of the connection structure 3 can be selected according to the actual application scenario and is not limited here. For example, the connection structure 3 can include a connection line.

[0045] As an example, the printing screen includes a rectangular screen frame 1 and a plurality of rectangular steel sheets. Each steel sheet is provided with a grid line printing opening 4, the shape and size of which match the grid line on the solar cell. The connecting structure 3 is welded to fix the sheet 2 in the screen frame 1 and ensure that each grid line printing opening 4 is arranged according to the target grid line pattern.

[0046] During the printing process, the paste is evenly printed on the solar cell through the grid line printing opening 4 to form a flat grid line. Compared with the traditional printing screen, the printing screen of the present invention can significantly improve the printing accuracy of the electrode pattern and the electrical performance of the solar cell.

[0047] According to the printed screen for solar cells of the present application, the printed screen is formed by a plurality of independent sheets 2 connected together by a connecting structure 3, each sheet 2 has at least one grid line printing opening 4, the printing medium can pass through the opening smoothly, the printed grid lines are smoother and more uniform, and each opening steel sheet is smaller in area than the entire opening steel plate, thereby enhancing the tension of the printing screen and extending its service life.

[0048] In some embodiments, the sheet 2 is provided with a plurality of connection holes 5 , and each connection hole 5 is arranged around the grid line printing opening 4 .

[0049] The connection holes 5 are formed on the sheet 2 and arranged around the grid line printing openings 4. The number and positions of the connection holes 5 can be determined according to the size and shape of the sheet 2 and the layout of the grid line printing openings 4. The connection holes 5 can ensure that the connection structure 3 can pass smoothly to achieve the connection between the sheets 2 and tightly connect the sheet 2 to the screen frame 1.

[0050] In some embodiments, the connection structure 3 includes connection lines, which are connected to each connection hole 5 and the screen frame 1 .

[0051] The connecting wire passes through the connecting hole 5 on the sheet 2 and is connected to the corresponding position on the screen frame 1, which can ensure the stability and position accuracy of the sheet 2 in the screen frame 1 and realize the accurate arrangement of the grid line printing openings 4. This connection method is simple and direct, and can effectively fix the position of the sheet 2 in the screen frame 1. The material, length and number of the connecting wire can be selected and adjusted according to actual needs.

[0052] Reference Figure 2 In some embodiments, the sheet 2 is rectangular, the sizes of the sheets 2 are the same, the positions of the connecting holes 5 on the sheets 2 are also the same, the first connecting hole 5 on the long side of the first sheet 2 is connected to the first connecting hole 5 on the long side of the second sheet 2, the second connecting hole 5 on the long side of the first sheet 2 is connected to the second connecting hole 5 on the long side of the second sheet 2, and so on, and the connecting lines are parallel to each other.

[0053] Reference Figure 3 In other embodiments, the sheet 2 is rectangular, the sizes of the sheets 2 are the same, the positions of the connecting holes 5 on the sheets 2 are also the same, the first connecting holes 5 on the long sides of the second sheet 2 are respectively connected to the first connecting holes 5 on the long sides of the first sheet 2 and the second connecting holes 5 on the long sides of the first sheet 2, the second connecting holes 5 on the long sides of the first sheet 2 are also connected to the second connecting holes 5 on the long sides of the second sheet 2, the second connecting holes 5 on the long sides of the second sheet 2 are also connected to the third connecting holes 5 on the long sides of the first sheet 2, and so on.

[0054] It should be noted that the connection relationship between the connection holes 5 can be selected according to the actual application scenario, and the above embodiment is only used as an example and does not limit the connection relationship between the connection holes 5.

[0055] In some embodiments, the material of the connecting wire is polyester fiber, steel or tungsten.

[0056] Tungsten wire, steel wire and polyester fiber all have sufficient strength and durability to withstand the pressure and tension during printing. In addition, tungsten wire, steel wire and polyester fiber all have good corrosion resistance and high temperature resistance. Using polyester fiber, steel or tungsten to make connecting wires can adapt to different printing environments and materials.

[0057] It should be noted that the material of the connecting wire can be selected according to the actual application scenario, and the above embodiment is only an example and does not limit the material of the connecting wire. For example, the connecting wire can also be made of polymer materials such as polyvinyl chloride, polyurethane, or stainless steel.

[0058] In some embodiments, the surface of each connecting hole 5 and the gap area between each sheet material 2 are covered with a blocking layer, and the blocking layer is used to block the printing medium from passing through.

[0059] The surface of the connecting hole 5 and the gap area between the sheets 2 are covered with a barrier layer, which can effectively prevent the printing medium from penetrating into the non-target graphic area during the printing process.

[0060] In the process of manufacturing the fine grid of the solar cell, the surface of the connection hole 5 and the gap area between the sheets 2 are covered with a barrier layer, which can ensure that the printed fine grid is clear and accurate.

[0061] In some embodiments, the material of the barrier layer includes a photosensitive material or polyimide.

[0062] After the photosensitive material is exposed, the unexposed part can be removed by a specific chemical treatment (such as development, fixing, etc.), thereby exposing the grid line printing opening 4 area on the sheet 2. This processing process is simple and reliable, and the thickness of the emulsion layer and the fineness of the pattern can be controlled. In addition, the photosensitive material can be firmly attached to the surface of the steel plate and will not easily fall off or be damaged even during the processing and printing process.

[0063] Polyimide has extremely high heat resistance and can withstand temperatures up to 300°C or even higher, and can still maintain stable performance in high temperature environments. This makes the printing screen using polyimide as an emulsion less likely to deform or damage during high-temperature printing, ensuring the accuracy and stability of printing. Polyimide has good corrosion resistance to most acids, alkalis, oxidants and reducing agents, and can maintain stable performance in harsh chemical environments. This helps to extend the service life of the printing screen and reduce damage caused by chemical corrosion.

[0064] The thickness of the barrier layer can be selected according to the actual application scenario and is not limited here. For example, when the material of the barrier layer is polyimide, its thickness can be 3um, 5um, 8um, 10um or 12um.

[0065] In some embodiments, the diameter of each connection hole 5 is 10um-15um, and the interval between each connection hole 5 is 15um-50um.

[0066] The diameter of each connecting hole 5 is 10um-15um, which can ensure that the connecting wire can pass through the connecting hole 5, and can also prevent the connecting hole 5 from being too large and too close to the edge of the sheet 2 to damage the sheet 2.

[0067] The intervals between the connection holes 5 are 15um-50um, which can not only meet the requirement of tightly connecting the sheets 2, but also avoid damaging the sheets 2 due to the small intervals between the connection holes 5.

[0068] The diameter of the connection hole 5 and the interval between the connection holes 5 can be selected according to the actual application scenario, and are not limited here. For example, the diameter of the connection hole 5 can be 12um, and the interval between the connection holes 5 can be 20um, or the diameter of the connection hole 5 can be 14um, and the interval between the connection holes 5 can be 30um.

[0069] In some embodiments, the sheets 2 are arranged in an array.

[0070] The sheets 2 are arranged in an array, and the sheets 2 arranged along the column direction are parallel to each other, ensuring that the printed grid lines are parallel to each other.

[0071] In some embodiments, a sheet 2 is provided for each row, and the length of each sheet 2 is greater than the required length of the grid line, so that the length of the grid line printing opening 4 meets the requirement of the grid line length to ensure the continuity of the grid line.

[0072] In other embodiments, multiple sheets 2 are arranged in each row, and the length of the gate line printing opening 4 on each sheet 2 can be selected according to the demand for gate line length. Arranging multiple sheets 2 in each row can meet the demand for printing discontinuous gate lines on the battery cell.

[0073] In some embodiments, the length of each grid line printing opening 4 is 100 mm-200 mm, the width of each grid line printing opening 4 is 5 um-25 um, and the interval between each sheet 2 arranged along the column direction is 0.5 mm-1 mm.

[0074] The length and width of the grid line printing opening 4 can be selected according to the requirements of the grid line length in the actual application scenario, and are not limited here. For example, the length of the grid line printing opening 4 is 110 mm, the width of the grid line printing opening 4 is 0.6 mm, or the length of the grid line printing opening 4 is 150 mm, the width of the grid line printing opening 4 is 0.8 mm, etc.

[0075] The intervals between the sheets 2 arranged in the column direction are 0.5 mm-1 mm, which can avoid the printed grid lines being too close to each other and causing unclear printing, and can fully utilize the space of the battery cell and avoid the grid lines being too far apart and causing too few printed grid lines.

[0076] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0077] In the description of the present application, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0078] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0079] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0081] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A printing screen for solar cells, characterized in that: include: Screen frame; A plurality of sheets are located in the screen frame, each of the sheets having at least one grid line printing opening; The connecting structure is connected to the sheet material and the screen frame so that each of the grid line printing openings is arranged in the screen frame according to a target pattern.

2. The printing screen according to claim 1, characterized in that: The sheet is provided with a plurality of connection holes, and each of the connection holes is arranged around the grid line printing opening.

3. The printing screen according to claim 2, characterized in that: The connection structure includes a connection line, and the connection line is connected to each of the connection holes and the screen frame.

4. The printing screen according to claim 3, characterized in that: The material of the connecting wire is polyester fiber, steel or tungsten.

5. The printing screen according to claim 2, characterized in that: The surface of each connection hole and the gap area between each sheet are covered with a blocking layer, and the blocking layer is used to block the printing medium from passing through.

6. The printing screen according to claim 5, characterized in that: The material of the blocking layer includes photosensitive material or polyimide.

7. The printing screen according to claim 2, characterized in that: The diameter of each of the connection holes is 10um-15um, and the interval between each of the connection holes is 15um-50um.

8. The printing screen according to any one of claims 1 to 7, characterized in that: The sheets are arranged in an array.

9. The printing screen according to claim 8, characterized in that: The length of each of the gate line printing openings is 100 mm-200 mm, the width of each of the gate line printing openings is 5 um-25 um, and the interval between each of the sheets arranged along the column direction is 0.5 mm-1 mm.

10. The printing screen according to any one of claims 1 to 7, characterized in that: The sheet material is made of steel, nickel, aluminum, alloy or ceramic.

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