Full-opening steel plate and printing equipment

Abstract

The invention belongs to the technical field of electrode printing, and discloses a full-opening steel plate and printing equipment. The full-opening steel plate comprises a steel plate body, a full-opening pattern used for printing fine grids and connecting lines at a time is formed on the steel plate body, the full-opening pattern comprises a plurality of main lines extending in the first direction and a plurality of connecting parts arranged on the main lines in the second direction, and the main lines are arranged in a continuous opening mode and used for printing and forming the fine grids. And the connecting parts are used for synchronously printing to form connecting lines during printing so as to bridge the adjacent fine grids in the second direction. The steel plate body at least comprises a first metal layer and a second metal layer. The first metal layer forms an outline of a full-opening pattern. The second metal layer is stacked on the first metal layer and is provided with an ink penetrating pattern corresponding to the full-opening pattern, and the ink penetrating pattern is at least arranged in a discontinuous opening mode in the area corresponding to the connecting part. The thin grid and the main grid / connecting line can be printed at a time, the problems of alignment errors and silver paste waste are avoided, and the production efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of electrode printing, and in particular to a full-opening steel plate and printing equipment. Background Art

[0002] In solar cell printing technology, the traditional screen printing plate is difficult to meet the demand for extremely fine line width due to the limitation of mesh structure. Therefore, a fully open steel plate has emerged to break through the bottleneck of line width and flatness.

[0003] However, traditional fully open steel plates usually need to be overprinted in steps when printing solar cells, and cannot be printed in a single pass. Specifically, two sets of steel plates are needed for printing, one for printing fine grids and the other for printing main grids or connecting wires corresponding to the welding strips.

[0004] Since the two sets of steel plates need to be mechanically aligned and positioned during step-by-step overprinting, and the steel plates are changed due to the manufacturing dimensional accuracy deviation, it is easy to cause alignment errors between the fine grid and the main grid / connection line. In addition, the silver paste in the overlapping area of ​​the fine grid and the main grid / connection line will be repeatedly covered, and the position of the overprint deviation needs additional compensation, resulting in a waste of silver paste.

[0005] Therefore, the above problems need to be solved urgently. Summary of the invention

[0006] The purpose of the present invention is to provide a full-opening steel plate and printing equipment to avoid the problems of alignment error and silver paste waste, and the production efficiency is high.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A fully open steel plate, comprising:

[0009] A steel plate body, on which a full-opening pattern for printing fine grids and connecting lines in a single pass is formed, wherein the full-opening pattern includes:

[0010] A plurality of main lines extending along a first direction, wherein the main lines are arranged as continuous openings and are used for printing to form fine grids; and

[0011] A plurality of connecting parts are arranged on the main line along the second direction, and the connecting parts are used to form the connecting lines by synchronous printing during printing, so as to bridge the fine grids adjacent to each other in the second direction;

[0012] Wherein, the steel plate body at least includes:

[0013] a first metal layer, the first metal layer forming an outline of the full opening pattern; and

[0014] The second metal layer is stacked on the first metal layer and has an ink-permeable pattern corresponding to the full-opening pattern, and the ink-permeable pattern is arranged in a discontinuous opening at least in a region corresponding to the connecting portion.

[0015] Preferably, the connecting portion comprises:

[0016] a first connecting portion extending along the first direction and used to connect two adjacent main lines in the first direction, and

[0017] The second connecting portion extends along the second direction and is used to bridge the main lines adjacent to each other in the second direction.

[0018] Preferably, the opening width of the first connecting portion gradually increases from both ends to the middle.

[0019] Preferably, a plurality of reinforcement grids are further provided on the second metal layer, and the plurality of reinforcement grids are arranged in one-to-one correspondence with the plurality of first connecting portions, and each of the reinforcement grids includes a plurality of slurry holes.

[0020] Preferably, the reinforcement grid is hollowed out on the second metal layer to form a plurality of the slurry holes, and a blocking portion is formed between adjacent slurry holes.

[0021] Preferably, a plurality of guide grooves are provided on the first metal layer, and the plurality of guide grooves are divided into a plurality of columns, each column has a column of guide grooves arranged on both sides of the second connecting part, and the ends of the plurality of guide grooves in the same column close to the second connecting part are all connected to the second connecting part.

[0022] Preferably, each of the guide grooves is arranged at an angle so as to form an angle with the scraping direction of the scraper or the ink return knife.

[0023] Preferably, the plurality of guide grooves in the same row have the same inclination direction and angle, and the guide grooves in two rows distributed on both sides of the second connecting portion in the same row have opposite inclination directions.

[0024] Preferably, the first metal layer and the second metal layer are both made of nickel-cobalt alloy.

[0025] A printing device comprises a frame, an ink supply mechanism, a pad printing mechanism and the above-mentioned fully-opened steel plate, wherein the ink supply mechanism, the pad printing mechanism and the fully-opened steel plate are all arranged on the frame, and the pad printing mechanism is used to print the silver paste supplied by the ink supply mechanism onto a substrate through the fully-opened steel plate in a single pass to form fine grids and main grids / connecting lines.

[0026] Beneficial effects of the present invention:

[0027] The fully-opened steel plate provided by the present invention can print fine grids and main grids / connecting lines in a single pass. Compared with the distributed overprinting method adopted by the traditional fully-opened steel plate, it can avoid the problems of alignment error and silver paste waste, and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the full-opening steel plate provided by the present invention;

[0029] Figure 2 It is a partial structural schematic diagram of the full-opening steel plate provided by the present invention;

[0030] Figure 3 is a schematic structural diagram of a first connecting portion and a reinforcing grid provided by the present invention;

[0031] Figure 4 It is a structural schematic diagram of the second connecting part and the ink-permeable pattern provided by the present invention.

[0032] In the figure:

[0033] 1. Main line; 2. Second connecting part; 3. Ink-permeable pattern; 4. First connecting part; 5. Reinforcement grid; 6. Paste hole; 7. Guide groove; 8. Blocking part. DETAILED DESCRIPTION

[0034] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0035] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0036] In the present application, the term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, a centrifugal vortex magnetic pump and / or a centrifugal vortex magnetic pump can represent: the existence of a centrifugal vortex magnetic pump alone, the existence of a centrifugal vortex magnetic pump and a centrifugal vortex magnetic pump at the same time, and the existence of a centrifugal vortex magnetic pump alone. In addition, the character " / " in the present application generally indicates that the objects associated before and after are in an "and / or" relationship.

[0037] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0038] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0039] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0040] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0041] See also Figures 1 to 4The present embodiment provides a fully-opened steel plate, which includes a steel plate body, on which a fully-opened pattern for printing fine grids and connecting lines is formed in a single pass, and the fully-opened pattern includes a plurality of main lines 1 extending in a first direction and a plurality of connecting portions arranged on the main lines 1 in a second direction, the main lines 1 being arranged as continuous openings for printing to form fine grids. The connecting portions are used to synchronously print and form connecting lines during printing to bridge the adjacent fine grids in the second direction.

[0042] The steel plate body includes at least a first metal layer and a second metal layer. The first metal layer forms the outline of the full-opening pattern. The second metal layer is stacked on the first metal layer and has an ink-permeable pattern 3 corresponding to the full-opening pattern, and the ink-permeable pattern 3 is arranged with intermittent openings at least in the area corresponding to the connection part.

[0043] It should be noted that this embodiment is described by taking the printed busbar-free battery cell as an example, so the connecting portion corresponds to the connecting line setting on the battery cell. In other embodiments, the connecting portion can also correspond to the busbar setting of the battery cell for printing the busbar, and no specific requirements and restrictions are made for this.

[0044] When the scraper scrapes across the surface of the second metal layer, the silver paste will penetrate into the first metal layer through the ink-permeable pattern 3, and then, under the constraint of the contour of the full-opening image, the silver paste will penetrate into the substrate along a linear track to form fine grids and connecting lines on the substrate, and the fine grids adjacent in the first direction will be connected into a whole fine grid by the adapter line. With this arrangement, the fine grids and main grids / connecting lines can be printed in a single time, and compared with the distributed overprinting method used by the traditional full-opening steel plate, the problems of alignment error and silver paste waste can be avoided, and the production efficiency is high.

[0045] Specifically, the connecting portion includes a first connecting portion 4 and a second connecting portion 2. The first connecting portion 4 extends along the first direction, and is used to connect two main lines 1 adjacent to each other in the first direction. The second connecting portion 2 extends along the second direction, and is used to bridge the main lines 1 adjacent to each other in the second direction. In this embodiment, the first direction and the second direction are perpendicular to each other. The first connecting portion 4 and the second connecting portion 2 correspond to the weld bead settings in the first direction and the second direction, respectively. With such a setting, two intersecting connecting lines can be printed at a single time, and the problem of overflow of the intersecting parts of the two connecting lines caused by the distributed overprinting method can be avoided, thereby helping to reduce the waste of silver paste.

[0046] Preferably, the opening width of the first connection part 4 gradually expands from both ends to the middle. In this way, the first connection part 4 forms a gradient structure with narrow ends and wide middle. When printing, the silver paste first fills the middle of the first connection part 4, and then the silver paste gradually fills the two ends, thereby avoiding overflow of the two ends of the first connection part 4.

[0047] Generally speaking, the area where the first connection part 4 connects the two main lines 1 is a stress concentration area, which is prone to fracture due to deformation caused by printing pressure. For this reason, in this embodiment, a plurality of reinforcing grids 5 are also provided on the second metal layer, and the plurality of reinforcing grids 5 are arranged one-to-one with the plurality of first connection parts 4, and each reinforcing grid 5 includes a plurality of slurry holes 6. The reinforcing grids 5 form a supporting structure below the first connection part 4, thereby being able to improve the structural strength of the area where the first connection part 4 connects the two main lines 1 on the first metal layer. It is worth noting that the pattern composed of the plurality of slurry holes 6 is also part of the ink permeable pattern 3 mentioned above.

[0048] In this embodiment, the reinforcing grid 5 is hollowed out on the second metal layer to form a plurality of slurry holes 6, and a barrier portion 8 is formed between adjacent slurry holes 6. It is understandable that the slurry holes 6 can guide the silver paste to penetrate downward, and the adjacent barrier portions 8 can support the upper first metal layer to prevent collapse when the scraper and the ink return knife apply pressure. It should be noted that the pattern and size of the slurry holes 6 are selected according to the actual application scenario, and this embodiment does not make specific requirements and restrictions on this. By way of example, the pattern of the slurry holes 6 includes but is not limited to hexagons, trapezoids, rectangles, arcs, etc.

[0049] It is worth noting that during printing, the scraper and the ink return knife usually reciprocate to achieve uniform distribution of the silver paste. In order to allow the silver paste to be better filled into the second connecting part 2, a plurality of guide grooves 7 are also provided on the first metal layer, and the plurality of guide grooves 7 are divided into multiple columns, and each column of the second connecting part 2 is provided with a column of guide grooves 7 on both sides, and the ends of the plurality of guide grooves 7 in the same column close to the second connecting part 2 are all connected to the second connecting part 2. With such a configuration, the scraper and the ink return knife converge the silver paste along the groove wall of the guide groove 7 toward the second connecting part 2, thereby avoiding the problem of material shortage in the second connecting part 2.

[0050] Furthermore, each guide groove 7 is inclined so as to be set at an angle with the scraping direction of the scraper or the ink return knife. It is understandable that the inclined guide groove 7 will cause the silver paste to form a pressure difference in the guide groove 7 during the scraping process of the scraper and the ink return knife. When the scraper and the ink return knife move, the silver paste has a larger front pressure and a smaller rear pressure under the action of the inclined guide groove 7, thereby enabling the silver paste to flow more smoothly into the second connecting part 2, increasing the filling amount and filling speed of the silver paste in the second connecting part 2, and reducing the poor connection problem caused by insufficient silver paste filling. It is also understandable that the inclined guide groove 7 is set at an angle with the scraping direction of the scraper or the ink return knife, which can make the silver paste more evenly dispersed in the guide groove 7 before entering the second connecting part 2, so that when the silver paste flows into the connecting hole, it can be more evenly distributed in the second connecting part 2, avoiding the situation of local silver paste accumulation or vacancy, and improving the uniformity and consistency of the main grid / connecting line.

[0051] Correspondingly, the multiple guide grooves 7 in the same row have the same inclination direction and angle, and the guide grooves 7 in two rows distributed on both sides of the second connecting part 2 in the same row have opposite inclination directions. For example, when the scraper and the ink return knife are to the right, the guide grooves 7 on the left are tilted to the right, forcing the silver paste to fill the second connecting part 2 on the right; when the scraper and the ink return knife are to the left, the guide grooves 7 on the right are tilted to the left, guiding the silver paste to the second connecting part 2 on the left. The guide grooves 7 on both sides are tilted in opposite directions to achieve forward printing and reverse ink return, avoiding filling dead corners.

[0052] To extend the service life of the fully open steel plate, the first and second metal layers are made of nickel-cobalt alloy. Nickel-cobalt alloy has both high hardness and ductility, and can withstand high-frequency mechanical stress (such as reciprocating friction between the scraper and the ink return knife). The first metal layer is not easily deformed, and is more suitable for battery cell printing scenarios.

[0053] This embodiment also provides a printing device, which includes a frame, an ink supply mechanism, a pad printing mechanism and the above-mentioned full-opening steel plate, the ink supply mechanism, the pad printing mechanism and the full-opening steel plate are all arranged on the frame, and the pad printing mechanism is used to print the silver paste supplied by the ink supply mechanism on the substrate through the full-opening steel plate in a single pass to form fine grids and main grids / connecting lines. It can be understood that the printing device including the above-mentioned full-opening steel plate has high production efficiency.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fully open steel plate, characterized in that: The fully open steel plate includes: A steel plate body, on which a full-opening pattern for printing fine grids and connecting lines in a single pass is formed, wherein the full-opening pattern includes: A plurality of main lines (1) extending along a first direction, wherein the main lines (1) are arranged with continuous openings and are used for printing to form fine grids; and A plurality of connecting parts arranged on the main line (1) along the second direction, the connecting parts being used to form the connecting lines by synchronous printing during printing, so as to bridge the fine grids adjacent to each other in the second direction; Wherein, the steel plate body at least includes: a first metal layer, the first metal layer forming an outline of the full opening pattern; and A second metal layer is stacked on the first metal layer and has an ink-permeable pattern (3) corresponding to the full-opening pattern, wherein the ink-permeable pattern (3) is arranged in a discontinuous opening at least in a region corresponding to the connecting portion.

2. A fully open steel plate according to claim 1, characterized in that: The connecting portion comprises: a first connecting portion (4), extending along the first direction, for connecting two adjacent main lines (1) in the first direction, and The second connecting portion (2) extends along the second direction and is used to bridge the main lines (1) adjacent to each other in the second direction.

3. A fully open steel plate according to claim 2, characterized in that: The opening width of the first connecting portion (4) gradually increases from both ends to the middle.

4. A fully open steel plate according to claim 3, characterized in that: A plurality of reinforcement grids (5) are also provided on the second metal layer. The plurality of reinforcement grids (5) are arranged in one-to-one correspondence with the plurality of first connecting portions (4), and each of the reinforcement grids (5) includes a plurality of slurry holes (6).

5. A fully open steel plate according to claim 4, characterized in that: The reinforcing grid (5) is hollowed out on the second metal layer to form a plurality of the slurry holes (6), and a blocking portion (8) is formed between adjacent slurry holes (6).

6. A fully open steel plate according to claim 2, characterized in that: A plurality of guide grooves (7) are also provided on the first metal layer, and the plurality of guide grooves (7) are divided into a plurality of columns, each column having a column of guide grooves (7) arranged on both sides of the second connecting portion (2), and the ends of the plurality of guide grooves (7) in the same column close to the second connecting portion (2) are all connected to the second connecting portion (2).

7. A fully open steel plate according to claim 6, characterized in that: Each guide groove (7) is arranged in an inclined manner so as to form an angle with the scraping direction of the scraper or the ink return knife.

8. A fully open steel plate according to claim 7, characterized in that: The plurality of guide grooves (7) in the same row have the same inclination direction and angle, and the guide grooves (7) in two rows distributed on both sides of the second connection portion (2) in the same row have opposite inclination directions.

9. The fully open steel plate according to claim 1, characterized in that: The first metal layer and the second metal layer are both made of nickel-cobalt alloy.

10. A printing device, characterized in that: It comprises a frame, an ink supply mechanism, a pad printing mechanism and a fully-opened steel plate as described in any one of claims 1 to 9, wherein the ink supply mechanism, the pad printing mechanism and the fully-opened steel plate are all arranged on the frame, and the pad printing mechanism is used for printing the silver paste supplied by the ink supply mechanism onto a substrate through the fully-opened steel plate in a single pass to form fine grids and main grids / connecting lines.

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