Screen printing plate and screen printing equipment
By incorporating bubble-reducing features in the stencil, the adhesion of soldering wires to solar cells is enhanced, addressing the issue of loose connections caused by air bubbles in silk screen printing.
Patent Information
- Application Number
- CN202422080575.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-26
AI Technical Summary
The existing printed screens have large mesh holes, which leads to easy bubbles when printing glue, resulting in unsolid connection between the solder tape and the battery cell.
A printed screen version is designed, with bubble shrinkage parts on the screen version, including dividing the body and sharp corners, which are used to reduce or puncture the bubbles in the glue point and increase the characterization tension of the glue point.
By reducing the bubbles in the glue point, the connection between the welding tape and the battery cell is improved, ensuring the stable connection between the welding tape and the battery cell.
Smart Images
Figure CN223100218U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of photovoltaic cell manufacturing, and particularly to a printing screen plate and a screen printing device. Background Art
[0002] When manufacturing a battery string, a screen printing device is usually used to print glue on a battery cell. During printing, the glue is first applied to the printing screen plate, and then the battery cell is placed on a printing platform. A squeegee moves on the printing screen plate to scrape and extrude the glue on the printing screen plate, so that the glue is transferred through the mesh holes of the printing screen plate to the battery cell to form a plurality of glue dots on the battery cell, and a welding ribbon is bonded to the battery cell through the glue dots. However, during the process of printing the glue on the battery cell, due to the relatively large mesh holes of the printing screen plate, printing bubbles are likely to be generated, resulting in an insecure connection between the welding ribbon and the battery cell. Summary of the Utility Model
[0003] Based on this, it is necessary to provide a printing screen plate and a screen printing device to improve the firmness of the connection between the welding ribbon and the battery cell.
[0004] In a first aspect, the present application provides a printing screen plate, including a screen plate body. The screen plate body is provided with a plurality of mesh holes for the glue to pass through to form glue dots on a printing substrate. The screen plate body is provided with a bubble shrinking portion disposed in the mesh holes, and the bubble shrinking portion is used for shrinking the bubbles in the glue dots.
[0005] In one embodiment, the screen plate body is provided with at least one column of the mesh holes. In each column, there are at least two of the mesh holes, and all the mesh holes are spaced along a first direction.
[0006] In one embodiment, the bubble shrinking portion includes a dividing body disposed in the mesh hole. The dividing body is connected to the hole wall of the mesh hole, and the dividing body is used for dividing the bubbles in the glue dots.
[0007] In one embodiment, the dividing body is strip-shaped; there is at least one of the dividing bodies, and all the dividing bodies are arranged along the first direction. All the dividing bodies extend along a direction intersecting with the first direction, and two ends of the dividing body are respectively connected to opposite sides of the hole wall of the mesh hole.
[0008] In one embodiment, at least one of the dividing bodies passes through the center of the mesh hole.
[0009] In one embodiment, the bubble shrinking portion includes at least one sharp corner, and all the sharp corners are disposed on the hole wall of the mesh hole. The sharp corners are used for puncturing the bubbles in the glue dots.
[0010] In one embodiment, the hole wall of the mesh hole is provided with saw teeth, and the tooth part of the saw teeth is the sharp angle; alternatively, the shape of the mesh hole is lightning-shaped.
[0011] In one embodiment, the surface of the mesh body is provided with a smooth coating.
[0012] In a second aspect, the present application further provides a screen printing device, including:
[0013] A printing platform for placing a printing substrate;
[0014] The above-mentioned printing screen plate is arranged above the printing platform; and
[0015] A squeegee, which is movably arranged on the printing screen plate, and the squeegee can move along a first direction to squeeze the glue on the printing screen plate, so that the glue is transferred to the printing substrate through the mesh holes.
[0016] In one embodiment, in the first direction, the center line of the printing screen plate coincides with the center line of the printing platform and the center line of the squeegee.
[0017] During the printing process of the above-mentioned printing screen plate and screen printing device, the air bubbles in the glue dots can be reduced through the air bubble reduction part, so that the air bubbles in the glue dots are reduced to a level that is difficult to see with the naked eye. In this way, the tensile strength of the glue dots can be improved, thereby improving the connection firmness between the solder tape and the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic structural diagram of a screen printing device according to an embodiment of the present application.
[0019] Figure 2 It is Figure 1 A partial enlarged schematic view of part A in
[0020] Figure 3 It is a schematic structural diagram of a printing screen plate according to an embodiment of the present application.
[0021] Figure 4 It is Figure 3 A partial enlarged schematic view of part B in
[0022] Figure 5 It is a schematic structural diagram of a printing screen plate according to one embodiment of the present application.
[0023] Figure 6 It is Figure 3 A partial enlarged schematic view of part C in
[0024] Figure 7 It is a schematic structural diagram of a printing screen plate according to another embodiment of the present application.
[0025] Figure 8 For Figure 7 the partial enlarged schematic view at position D in
[0026] Explanation of the reference numerals in the attached drawings:
[0027] 10. Printing screen; 11. Screen body; 111. Mesh holes; 1111. Bubble shrinking part; 11111. Dividing body; 11112. Sharp corner; 12. Frame; 20. Doctor blade; 30. Printing platform. Specific embodiments
[0028] To make the above objectives, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0029] Refer to Figure 1 , a screen printing device provided by an embodiment of the present application includes a printing screen 10, a doctor blade 20, and a printing platform 30 for placing a printing substrate. The printing screen 10 is disposed above the printing platform 30. The printing screen 10 includes a screen body 11, and the screen body 11 is provided with a plurality of mesh holes 111 for glue to pass through. The doctor blade 20 is movably disposed on the printing screen 10. The doctor blade 20 is used to scrape and extrude the glue so that the glue is transferred to the printing substrate through the mesh holes 111 to form glue dots on the printing substrate.
[0030] Further, refer to Figure 1 , the screen body 11 is provided with at least one column of mesh holes 111. In each column, there are at least two mesh holes 111, and all the mesh holes 111 are arranged at intervals in a first direction. It should be noted that during printing, the first direction is parallel to the extending direction of the main grid of the battery cell. For the convenience of understanding, S1 is used to represent the first direction.
[0031] Optionally, refer to Figure 1 , the mesh holes 111 are provided with at least two columns, and all the column mesh holes 111 are arranged at intervals in a second direction so that all the mesh holes 111 are arranged in an array. Among them, the first direction is perpendicular to the second direction, and S2 is used to represent the second direction. Since all the mesh holes 111 are arranged in an array, the printing screen 10 can print multiple glue lines simultaneously, which is beneficial to improving the printing efficiency.
[0032] The screen printing equipment of this embodiment is applicable to printing glue on solar cells, that is, the printing substrate is a solar cell. During printing, first apply the glue on the screen body 11 so that the glue covers the mesh holes 111. The glue can be a conductive glue or a non-conductive glue. Optionally, the glue can be a glue in systems such as silicone, epoxy resin, and acrylic. Then, accurately place the solar cell on the printing platform 30. At this time, the solar cell is located between the printing screen 10 and the printing platform 30. Then, the squeegee 20 moves on the printing screen 10 to squeeze the glue on the printing screen 10, so that the glue is evenly transferred through the mesh holes 111 to the main grid lines of the solar cell, forming multiple glue dots on the main grid lines of the solar cell. The multiple glue dots form a glue line, and the glue line is centered on the main grid line of the solar cell, and the length of the glue line is less than or equal to the length of the main grid line of the solar cell.
[0033] In this way, the front and back sides of the solar cell are applied with glue by the screen printing equipment, and then the head and tail ends of multiple solar cells form the basic structural unit of the photovoltaic module through series connection, parallel connection, or a combination of series and parallel connection. After steps such as lamination, framing, and wiring, a photovoltaic module is formed.
[0034] During the printing process, due to the large area of the mesh holes 111, air bubbles are formed inside the glue dots. And the existence of air bubbles inside the glue dots will cause the apparent tensile strength of the glue dots to decrease and the connection between the solder strip and the solar cell to be less firm. Therefore, in this embodiment, the screen body 11 is provided with an air bubble shrinking part 1111. The air bubble shrinking part 1111 is arranged inside the mesh hole 111, and the air bubble shrinking part 1111 is used to shrink the air bubbles inside the glue dots.
[0035] It should be noted that during the printing process, the air bubble shrinking part 1111 can shrink the air bubbles inside the glue dots formed by the corresponding mesh holes 111. For example, the air bubble shrinking part 1111 can divide the air bubbles generated during printing or pierce the air bubbles inside the glue dots, so that the air bubbles inside the glue dots are shrunk to be hardly visible to the naked eye. In this way, it is beneficial to improve the apparent tensile strength of the glue dots, thereby improving the connection firmness between the solder strip and the solar cell.
[0036] In one embodiment, refer to Figures 1 to 4 , the air bubble shrinking part 1111 includes a dividing body 11111. The dividing body 11111 is arranged inside the mesh hole 111, and the dividing body 11111 is connected to the hole wall of the mesh hole 111. The dividing body 11111 is used to divide the air bubbles inside the glue dots. Since the dividing body 11111 is arranged inside the mesh hole 111, the dividing body 11111 can divide the air bubbles generated during printing, so that the air bubbles inside the glue dots printed on the solar cell are shrunk to be hardly visible to the naked eye. In this way, the apparent tensile strength of the glue dots can be improved, thereby improving the connection firmness between the solder strip and the solar cell.
[0037] Optionally, refer to Figures 1 to 4, the dividing body 11111 is divided into strips, for example, the dividing body 11111 is linear, wavy or serrated.
[0038] Further, referring to Figure 2 and Figure 4 , there is at least one dividing body 11111, all the dividing bodies 11111 are arranged along the first direction, and all the dividing bodies 11111 extend along a direction intersecting the first direction. Optionally, the dividing body 11111 extends along the second direction. The two ends of the dividing body 11111 are respectively connected to the opposite sides of the hole wall of the mesh hole 111.
[0039] During printing, the strip-shaped dividing body 11111 divides the bubbles, so that the bubbles in the glue dots are quickly discharged, and the bubbles in the glue dots are reduced to the point where they are difficult to see with the naked eye, improving the firmness of the connection between the solder strip and the battery cell. After division, the individual glue dots become smaller, so the force on each individual glue dot is more concentrated, and each individual glue dot is not easily collapsed, and the glue dots can maintain a good glue shape and appearance.
[0040] Since the dividing body 11111 extends along a direction intersecting the first direction, that is, the dividing body 11111 intersects the setting direction of the solder strip, the glue dots after division still have good wrapping properties, that is, the glue dots can better wrap the solder strip, improving the firmness of the connection between the solder strip and the battery cell.
[0041] In addition, since the two ends of the strip-shaped dividing body 11111 are respectively connected to the opposite sides of the hole wall of the mesh hole 111, the dividing body 11111 can play a role in strengthening the structure, preventing the deformation of the printing screen plate 10 caused by multiple printings, and improving the service life of the printing screen plate 10.
[0042] In the actual production process, the positions where bubbles are formed are mostly at the center positions of the glue dots. Therefore, in this embodiment, at least one dividing body 11111 passes through the center of the mesh hole 111. In this way, the bubbles can be divided more accurately.
[0043] Optionally, referring to Figure 1 and Figure 2 , there is one dividing body 11111, the dividing body 11111 extends along the second direction, and the two ends of the dividing body 11111 are respectively connected to the middle parts of the opposite two hole walls of the mesh hole 111 along the first direction. For example, the shape formed by the cooperation of the mesh hole 111 and the dividing body 11111 is a "day" shape.
[0044] Optionally, there are two or more dividing bodies 11111, and all the dividing bodies 11111 extend along the second direction. The two ends of one of the dividing bodies 11111 are respectively connected to the middle parts of the opposite two pore walls of the mesh hole 111 along the first direction, and the remaining dividing bodies 11111 are arranged on the side of the dividing body 11111 in the middle. For example, the shape formed by the cooperation of the mesh hole 111 and the dividing body 11111 is a "mu" character shape. Of course, in other embodiments, all the dividing bodies 11111 can also be arranged at equal intervals along the first direction.
[0045] It should be noted that the size of the mesh hole 111 can be set according to actual needs and will not be specifically limited here. Taking the "ri" character shape as an example, the overall length of the "ri" character structure formed by the cooperation of the mesh hole 111 and the dividing body 11111 is 1.5 mm, and the width is 0.5 mm. The "ri" character structure formed by the cooperation of the mesh hole 111 and the dividing body 11111 has two mesh holes 111 with equal sizes up and down. The length of the two mesh holes 111 up and down is 1.5 mm, the width is 0.2 mm, and the width of the dividing body 11111 is 0.1 mm.
[0046] Of course, in other embodiments, the dividing body 11111 is a "cross" shape, that is, the shape formed by the cooperation of the mesh hole 111 and the dividing body 11111 is a "tian" character shape. Or, the dividing body 11111 is a "kou" character shape, and the "kou" character-shaped dividing body 11111 is connected to the pore wall of the mesh hole 111 through a connecting structure. Optionally, the connecting structure is a rod, one end of the rod is connected to the outer side wall of the "kou" character-shaped dividing body 11111, and the other end of the rod is connected to the pore wall of the mesh hole 111. As long as it is ensured that the dividing body 11111 can divide the bubbles and at the same time ensure the wrapping property of the glue dots to the solder tape.
[0047] In another embodiment, refer to Figure 5 and Figure 6 , the bubble shrinking part 1111 includes at least one sharp corner 11112. All the sharp corners 11112 are arranged on the pore wall of the mesh hole 111, and the sharp corners 11112 are used for piercing the bubbles in the glue dots. Since the pore wall of the mesh hole 111 is formed with sharp corners 11112, the sharp corners 11112 can pierce the bubbles generated during printing, so that the bubbles in the glue dots printed on the battery chip are reduced to be hardly visible to the naked eye. In this way, the representative tensile force of the glue dots can be improved, thereby improving the connection firmness between the solder tape and the battery chip.
[0048] Optionally, refer to Figure 5 and Figure 6 , the shape of the mesh hole 111 is a lightning shape, so that the pore wall of the mesh hole 111 is formed with sharp corners 11112.
[0049] Optionally, refer to Figure 7 andFigure 8 The hole wall of the mesh hole 111 is provided with sawteeth, and the tooth part of the sawteeth is a sharp angle 11112.
[0050] In one embodiment, referring to Figure 1 , the area where the mesh hole 111 is located is in the middle of the mesh body 11. It can be understood that, whether in the first direction or the second direction, the area where the mesh hole 111 is located is centered. With such a setting, when printing, the tension distribution of the printing screen 10 is uniform.
[0051] In one embodiment, the mesh body 11 is a steel mesh plate. Of course, in other embodiments, the mesh body 11 can also be made of other materials, and this is not limited thereto.
[0052] In one embodiment, the surface of the mesh body 11 is provided with a smooth coating. With such a setting, the surface smoothness of the screen can be improved, and it can prevent the glue dots from sticking and pulling the glue and the rebound from forming bubbles. Of course, in other embodiments, the surface of the mesh body 11 can also be without a coating.
[0053] Optionally, the smooth coating is a fluorine coating. In this way, by coating the fluorine coating on the surface of the mesh body 11, the surface smoothness of the mesh body 11 can be improved, and at the same time, the corrosion resistance of the mesh body 11 can also be improved.
[0054] Optionally, the smooth coating is a nano - coating. In this way, by coating the nano - coating on the surface of the mesh body 11, the smoothness of the mesh body 11 can be improved, and at the same time, it can also play roles such as waterproofing, dust - proofing, and anti - oxidation.
[0055] In one embodiment, referring to Figure 1 , the printing screen 10 further includes a frame 12. The mesh body 11 is arranged inside the frame 12 and connected to the frame 12.
[0056] In one embodiment, referring to Figure 1 , in the first direction, the center line of the squeegee 20 coincides with the center line of the mesh body 11, and the center line of the mesh body 11 coincides with the center line of the printing platform 30. With such a setting, it can ensure that the tension of the printing screen 10 is uniform during printing.
[0057] In one embodiment, the screen printing device further includes a monitoring device. The monitoring device includes a camera and an image analysis module signal - connected to the camera. The camera takes real - time images of the printed battery cells, and the image analysis module automatically analyzes whether the printing quality meets the requirements. For example, the image analysis module can monitor and analyze glue shortage, printing offset, printing glue weight, and morphological dimensions, etc., and perform analysis and processing according to the monitoring results.
[0058] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.
[0059] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0060] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "joined", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0061] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0062] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.
[0063] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.
[0064] The above-described embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.
Claims
1. A printing screen plate (10), characterized in that, It includes a screen printing plate body (11), the screen printing plate body (11) is provided with a plurality of mesh holes (111), and the mesh holes (111) allow glue to pass through to form glue dots on a printed substrate. The screen printing plate body (11) is provided with a bubble reduction part (1111), the bubble reduction part (1111) is arranged in the mesh hole (111), and the bubble reduction part (1111) is used for reducing the bubbles in the glue dots.
2. The printing screen (10) according to claim 1, characterized in that, The screen printing plate body (11) is provided with at least one column of the mesh holes (111). In each column, there are at least two mesh holes (111), and all the mesh holes (111) are arranged at intervals in a first direction.
3. The printing screen (10) according to claim 2, characterized in that, The bubble reduction part (1111) includes a dividing body (11111), the dividing body (11111) is arranged in the mesh hole (111), the dividing body (11111) is connected to the hole wall of the mesh hole (111), and the dividing body (11111) is used for dividing the bubbles in the glue dots.
4. The printing screen (10) according to claim 3, characterized in that, The dividing body (11111) is strip-shaped, there is at least one dividing body (11111), all the dividing bodies (11111) are arranged in the first direction, all the dividing bodies (11111) extend along a direction intersecting the first direction, and the two ends of the dividing body (11111) are respectively connected to the opposite sides of the hole wall of the mesh hole (111).
5. The printing screen (10) according to claim 3, characterized in that, At least one dividing body (11111) passes through the center of the mesh hole (111).
6. The printing screen (10) according to claim 1, characterized in that, The bubble reduction part (1111) includes a sharp corner (11112), the sharp corner (11112) is arranged on the hole wall of the mesh hole (111), and the sharp corner (11112) is used for piercing the bubbles in the glue dots.
7. The printing screen (10) according to claim 6, characterized in that, The hole wall of the mesh hole (111) is provided with saw teeth, and the tooth part of the saw teeth is the sharp corner (11112); or, the shape of the mesh hole (111) is lightning-shaped.
8. The printing screen (10) according to any one of claims 1 to 7, characterized in that, The surface of the screen printing plate body (11) is provided with a smooth coating.
9. A screen printing device, characterized in that, It includes: A printing platform (30) for placing a printed substrate; The printing screen plate (10) according to any one of claims 1 to 8, the printing screen plate (10) is arranged above the printing platform (30); And A squeegee (20) movably arranged on the printing screen plate (10), the squeegee (20) can move along a first direction to squeeze the glue on the printing screen plate (10) so that the glue is transferred to the printed substrate through the mesh holes (111).
10. The screen printing device according to claim 9, characterized in that, In the first direction, the center line of the printing screen plate (10) coincides with the center line of the printing platform (30) and the center line of the squeegee (20).