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 a whole fine grid 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 switching parts, and the main lines are arranged in a continuous opening mode and used for printing and forming the fine grid. Openings of the main lines are filled with switching parts, and the switching parts are used for synchronously printing to form switching lines during printing so as to connect the adjacent fine grids in the first direction and form a plurality of whole fine grids. 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 switching part. According to the invention, a long thin grid can be printed at a time, the waste of silver paste is reduced, and the current circulation effect is improved.

Description

Technical Field

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

[0002] In the printing technology of solar cell wafers, due to the limitation of the mesh knot structure of traditional screen printing plates, it is difficult to meet the requirements of extremely fine line widths. Therefore, a full-opening steel plate that breaks through the bottlenecks of line width and flatness has emerged.

[0003] Traditional full-opening steel plates cannot print a long fine grid in a single pass. Usually, at least two printing plates need to be used in a distributed overprinting method to lap adjacent two fine grids into a longer fine grid. However, the silver paste in the above overlapping area will be repeatedly covered, which will not only cause waste of silver paste, but also affect the current flow effect during the subsequent use of the battery.

[0004] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0005] The purpose of the present invention is to provide a full-opening steel plate and a printing device, so as to print a long fine grid in a single pass, thereby reducing the waste of silver paste and improving the current flow effect during the subsequent use of the battery.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A full-opening steel plate, the full-opening steel plate includes:

[0008] A steel plate main body, on which a full-opening pattern for printing an entire fine grid in a single pass is formed, and the full-opening pattern includes:

[0009] A plurality of main lines extending in a first direction, the main lines are continuously open for printing to form fine grids; and,

[0010] A plurality of connecting parts, the openings of the plurality of main lines are filled by the connecting parts, and the connecting parts are used to synchronously print and form connecting lines during printing to connect the adjacent fine grids in the first direction and form a plurality of entire fine grids;

[0011] Wherein, the steel plate main body at least includes:

[0012] A first metal layer, the first metal layer forms the outline of the full-opening pattern; and,

[0013] A second metal layer, the second metal layer is laminated on the first metal layer and has an ink-permeable pattern corresponding to the full-opening pattern, and the ink-permeable pattern is intermittently open at least in the area corresponding to the connecting parts.

[0014] Preferably, the full-opening pattern further comprises a plurality of connection portions arranged on the main line along the second direction, and the connection portions are used for printing connection lines to bridge the fine grids adjacent to each other in the second direction.

[0015] Preferably, two adjacent transition portions in the second direction are connected via the connecting portion.

[0016] Preferably, the transition portion connected to the connecting portion gradually expands from both ends to the middle.

[0017] Preferably, the ink-permeable pattern includes a plurality of reinforcement grids, the plurality of reinforcement grids are arranged in one-to-one correspondence with a plurality of adapters, and the reinforcement grids include a plurality of pulp holes.

[0018] 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.

[0019] Preferably, a plurality of reinforcing wires arranged along the first direction are arranged across the transition portion on the second metal layer, and the plurality of reinforcing wires and the transition portion form the reinforcing grid.

[0020] Preferably, each of the reinforcing wires is connected end to end to form the slurry passage hole which is narrow at both ends and wide in the middle.

[0021] Preferably, a plurality of grooves are distributed on the surface of the first metal layer.

[0022] 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 to form a plurality of whole fine grids.

[0023] Beneficial effects of the present invention:

[0024] The present invention can print a relatively long fine grid in a single pass. Compared with the distributed overprinting method used by the traditional full-opening steel plate, the relatively long fine grid will not have an overlapping area, thereby reducing the waste of silver paste and improving the current flow effect during the subsequent use of the battery. In addition, the relatively long fine grid can be printed in a single pass, which has high production efficiency compared with the distributed overprinting method used by the traditional full-opening steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the full-opening steel plate provided by the present invention;

[0026] Figure 2Schematic diagram of the reinforcement grid and the adapter provided by the present invention Figure 1 ;

[0027] Figure 3 Schematic diagram of the reinforcement grid and the adapter provided by the present invention Figure 2 。

[0028] In the figure:

[0029] 1. Main line; 2. Adapter; 3. Reinforcement grid; 4. Pulp passing hole; 5. Blocking part; 6. Reinforcement wire. Detailed implementation manners

[0030] Before explaining in detail any implementation manner of the present application, it should be understood that the present application is not limited to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0031] In the present application, the terms "comprise", "include", "have" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element.

[0032] In the present application, the term "and / or" describes the associative relationship of associated objects and indicates that three relationships may exist. For example, a centrifugal vortex magnetic pump and / or a centrifugal vortex magnetic pump may represent: the sole existence of a centrifugal vortex magnetic pump, the simultaneous existence of a centrifugal vortex magnetic pump and a centrifugal vortex magnetic pump, and the sole existence of a centrifugal vortex magnetic pump. Additionally, in the present application, the character " / " generally indicates that the associated objects before and after are in an "and / or" relationship.

[0033] In the present application, the terms "connect", "combine", "couple", "mount" may be direct connection, combination, coupling or mounting, or may be indirect connection, combination, coupling or mounting. Among them, by way of example, direct connection means that two parts or components are connected together without the need to provide an intermediate member, and indirect connection means that two parts or components are respectively connected to at least one intermediate member, and these two parts or components are connected through the intermediate member. In addition, "connect" and "couple" are not limited to physical or mechanical connection or coupling and may include electrical connection or coupling.

[0034] In this application, those of ordinary skill in the art will understand that relative terms used in connection with a quantity or condition (e.g., "about", "approximately", "substantially", etc.) are intended to include the recited value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances resulting from manufacturing, assembly, use, etc. associated with a particular value. Such terms should also be considered to disclose ranges defined by the absolute values of 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 employ relative terms should also be disclosed as specific values with tolerances. In addition, when expressing a relative angular positional relationship (e.g., substantially parallel, substantially perpendicular), "substantially" may refer to plus or minus a certain number of degrees (e.g., 1 degree, 5 degrees, 10 degrees or more) from the indicated angle.

[0035] In this application, those of ordinary skill in the art will understand that the functions performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0036] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", "rear", etc. are described based on the orientation and positional relationship shown in the drawings, and should not be construed as limiting the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element. It should also be understood that orientation terms such as the upper side, lower side, left side, right side, front side, rear side, etc. not only represent the positive orientation, but can also be understood as the side orientation. For example, the lower side can include directly below, lower left, lower right, lower front, and lower rear, etc.

[0037] Please refer to Figures 1 to 3 , this embodiment provides a full-opening steel plate. The full-opening steel plate includes a steel plate body, and a full-opening pattern for single-pass printing of an entire fine grid is formed on the steel plate body. The full-opening pattern includes a plurality of main lines 1 extending in a first direction and a plurality of connecting portions 2. The main lines 1 are continuously opened for printing to form fine grids. The openings of the plurality of main lines 1 are all filled with the connecting portions 2. The connecting portions 2 are used to synchronously print and form connecting lines during printing to connect adjacent fine grids in the first direction and form a plurality of entire fine grids.

[0038] Among them, the main body of the steel plate 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 laminated on the first metal layer and has an ink-permeating pattern corresponding to the full opening pattern. The ink-permeating pattern is at least intermittently open in the area corresponding to the connection part 2.

[0039] When the squeegee scrapes across the surface of the second metal layer, the silver paste will penetrate through the ink-permeating pattern to the first metal layer. Under the constraint of the outline of the full opening image, the silver paste penetrates along a linear trajectory onto the substrate, so as to form fine grids and connection lines on the substrate, and the connection lines connect the fine grids adjacent in the first direction into a whole fine grid. With such a setting, a relatively long fine grid can be printed in one pass. Compared with the distributed overprinting method used by traditional full-opening steel plates, there is no overlapping area for the relatively long fine grids, so that the waste of silver paste can be reduced, and the current flow effect during the subsequent use of the battery can be improved. In addition, printing a relatively long fine grid in one pass has high production efficiency compared with the distributed overprinting method used by traditional full-opening steel plates.

[0040] It should be noted that the battery cell generally further includes main grids / connection lines that sequentially connect several fine grids. In this embodiment, the printing of a battery cell without main grids is taken as an example for illustration, so connection lines also need to be printed. Correspondingly, the full opening pattern further includes several connection parts (not shown in the figure) arranged on the main line 1 along the second direction. The connection parts are used for printing connection lines to bridge the fine grids adjacent in the second direction. It can be understood that adding connection parts arranged on the main line 1 along the second direction for printing connection lines can meet the printing requirements of different battery cells. It should be noted that in this embodiment, the printing of a battery cell without main grids is taken as an example for illustration, so the connection parts are arranged corresponding to the connection lines on the battery cell. In other embodiments, the connection parts can also be arranged corresponding to the main grids of the battery cell for printing main grids, and no specific requirements and limitations are made in this regard.

[0041] Based on the content described above, all the fine grids in the first direction are connected into a whole through the connection part 2, so that the fine grids printed on the battery cell can be divided into multiple strips. For this reason, by arranging a plurality of connection parts along the arrangement direction of several main lines 1 into one strip, a main grid or a connection line that can connect multiple fine grids at the same time can be printed, so that the waste of silver paste can be further reduced. As can be seen from the above, the arrangement direction of several main lines 1 is the second direction. In this embodiment, the first direction and the second direction are perpendicular to each other.

[0042] Generally speaking, in a battery cell without main grids, the connection lines all correspond to the solder pads on the battery cell. During the design stage, factors such as the overlapping position between the connection lines and the fine grids need to be considered. For this reason, in this embodiment, two adjacent connection parts 2 in the second direction are connected through a connection part. The connection part 2 can be conveniently arranged corresponding to the requirements of the connection lines.

[0043] In addition, the solder joints of the solar cells need to be penetrated during production so that the connecting wires can connect the fine grids on both the front and back sides of the solar cells at the same time. As a result, more silver paste is required at the connection positions between the connecting wires and the fine grids to make a redundant design for the penetration operation. Correspondingly, the transition part 2 communicating with the connecting part gradually expands from both ends to the middle, so that more silver paste can flow through the middle part where the transition part 2 communicates with the connecting part than at both ends. In addition, the transition part 2 communicating with the connecting part forms a gradually changing structure with narrow ends and wide middle. When printing, the silver paste first fills the middle part of the first connecting part, and then the silver paste is filled in a gradient manner towards both ends, thereby avoiding silver paste overflow at both ends of the first connecting part.

[0044] It should be noted that the area where the transition part 2 communicates with the two main lines 1 is a stress concentration area and is prone to fracture due to printing demolding tension or thermal expansion. Therefore, in this embodiment, the ink-permeable pattern includes a number of strengthening grids 3, and a number of strengthening grids 3 are arranged in one-to-one correspondence with a number of transition parts 2. The strengthening grid 3 includes a plurality of silver paste passing holes 4. The strengthening grid 3 forms a supporting structure under the transition part 2, thereby being able to enhance the structural strength of the area where the transition part 2 on the first metal layer communicates with the two main lines 1. It should be noted that the pattern formed by the plurality of silver paste passing holes 4 is also part of the ink-permeable pattern described above.

[0045] In this embodiment, the strengthening grid 3 is made by hollowing out on the second metal layer to form a plurality of silver paste passing holes 4, and a blocking part 5 is formed between adjacent silver paste passing holes 4. It can be understood that the silver paste passing holes 4 can guide the silver paste to penetrate downward, and the adjacent blocking parts 5 can support the upper first metal layer to prevent collapse when the squeegee applies pressure. It should be noted that the pattern and size of the silver paste passing holes 4 are selected according to the actual application scenario, and this embodiment does not make specific requirements and restrictions on this. Exemplarily, the pattern of the silver paste passing holes 4 includes but is not limited to hexagon, trapezoid, rectangle, arc, etc.

[0046] In other embodiments, strengthening holes are provided on the second metal layer, and a number of strengthening wires 6 are arranged across the strengthening holes along the first direction. The number of strengthening wires 6 and the strengthening holes enclose the strengthening grid 3. With this arrangement, by supporting the upper first metal layer with a number of strengthening wires 6, collapse can be avoided when the squeegee applies pressure. In addition, the strengthening wires 6 have a smaller volume than the above-mentioned hollowed-out supporting blocking parts, and can make the silver paste flow through the strengthening grid 3 more smoothly.

[0047] Specifically, each strengthening wire 6 is connected end to end to enclose a silver paste passing hole 4 with narrow ends and wide middle. The silver paste passing hole 4 gradually expands from both ends to the middle, which can play a guiding role for the silver paste. When the silver paste enters from both ends of the silver paste passing hole 4, due to the gradually increasing aperture, the silver paste will be concentrated and guided to the middle, making the silver paste flow more precisely to the areas that need to be filled, such as the parts for forming fine grids and connecting wires, thereby improving the clarity and accuracy of printing and ensuring the quality of the printed pattern.

[0048] In particular, the surface of the first metal layer is distributed with a number of grooves (not shown in the figure). The presence of the grooves increases the friction between the surface of the first metal layer and the silver paste, forming an effective resistance to the paste. When the scraper scrapes across the surface of the first metal layer, this resistance prevents the paste from sliding easily with the scraper, but can be pushed and squeezed more accurately by the scraper, so that the silver paste can be more accurately filled to the main line 1, the transition part 2 and other precise positions.

[0049] 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 onto the substrate through the full-opening steel plate to form a plurality of whole fine grids. It can be understood that the printing device including the above-mentioned full-opening steel plate can print relatively long fine grids with high production efficiency.

[0050] 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 should 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 a whole fine grid at a single time 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 transition parts (2), the openings of a plurality of the main lines (1) are filled by the transition parts (2), and the transition parts (2) are used to form transition lines when printing to connect the adjacent fine grids in the first direction and form a plurality of complete fine grids; 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 corresponding to the full-opening pattern, wherein the ink-permeable pattern is arranged in a discontinuous opening at least in a region corresponding to the transition portion (2).

2. A fully open steel plate according to claim 1, characterized in that: The full-opening pattern further comprises a plurality of connection portions arranged on the main line (1) along the second direction, wherein the connection portions are used for printing connection lines to bridge the fine grids adjacent to each other in the second direction.

3. A fully open steel plate according to claim 2, characterized in that: The two transition portions (2) adjacent to each other in the second direction are connected via the connecting portion.

4. A fully open steel plate according to claim 3, characterized in that: The transition part (2) communicated with the connection part gradually expands from both ends to the middle.

5. A fully open steel plate according to claim 1, characterized in that: The ink-permeable pattern comprises a plurality of reinforcing grids (3), the plurality of reinforcing grids (3) are arranged in one-to-one correspondence with the plurality of adapter portions (2), and the reinforcing grids (3) comprise a plurality of pulp-passing holes (4).

6. A fully open steel plate according to claim 5, characterized in that: The reinforcing grid (3) is hollowed out on the second metal layer to form a plurality of the slurry holes (4), and a blocking portion (5) is formed between adjacent slurry holes (4).

7. A fully open steel plate according to claim 5, characterized in that: A plurality of reinforcing wires (6) arranged along a first direction are arranged across the transition portion (2) on the second metal layer, and the plurality of reinforcing wires (6) and the transition portion (2) form the reinforcing grid (3).

8. A fully open steel plate according to claim 7, characterized in that: Each of the reinforcing wires (6) is connected end to end to form the slurry passage hole (4) which is narrow at both ends and wide in the middle.

9. The fully open steel plate according to claim 1, characterized in that: A plurality of grooves are distributed on the surface of the first metal layer.

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 to print the silver paste supplied by the ink supply mechanism onto a substrate through the fully-opened steel plate to form a plurality of whole fine grids.

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