Metal screen plate

Abstract

The utility model discloses a metal screen printing plate, which relates to the technical field of printing screen printing plates, and comprises a gauze, the gauze is provided with a bonding pad area part and a non-bonding pad area, the bonding pad area part is provided with a bonding pad and a harpoon, the heights of the vertical sections of the bonding pad and the harpoon are staggered, and the horizontal sections of the bonding pad and the harpoon are provided with openings with different diameters. Aiming at the problem that the mesh thickness of the existing metal screen is consistent, the thickness of the vertical section is increased and the flowability of slurry at the position is reduced at the position of a bonding pad and a harpoon with a larger horizontal section opening in the bonding pad area part, so that more slurry can be stored in the area, and the printing thickness of the area during printing is further improved. By using the metal screen plate for improving the thickness of the printing slurry in the local area, the problem that the height of the slurry in the area where part of the bonding pad is located is not enough during printing of the metal screen plate can be solved, and the influence on the conductivity of a printed battery piece is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of printing screens, in particular to a metal screen. Background Art

[0002] In the existing screen printing screen structure, the mesh will have a cross structure of warp and weft lines, and through the drawing or alignment process, the opening pattern can be formed at the intersection nodes without warp and weft lines to form a mesh without mesh knots. Although such a structure has fewer mesh knots to block, it also further reduces the storage capacity of the slurry on the mesh in the area with larger openings, resulting in reduced printing quality. Therefore, a metal screen with a completely new structure is urgently needed to solve the above problems.

[0003] Chinese patent document CN113561634A discloses "a metal screen for improving printability". A metal screen for improving printability is used, comprising a metal screen body, a printing channel extending along its printing direction is provided on the metal screen body, a plurality of transition yarns arranged along its extension track are provided in the printing channel, and both ends of the transition yarns are connected to the printing channel, and the transition yarns are arc-shaped transition yarns that are raised in the opposite direction of the printing direction. However, the slurry penetration of the patent is insufficient and cannot meet the daily printing needs. Summary of the invention

[0004] The utility model mainly solves the technical problem that the original metal screen cannot store enough slurry. It provides a metal screen, in which pads and harpoons are arranged in the pad area of ​​the mesh, and the vertical section height is increased for the pads and harpoons with larger horizontal section opening diameters, so as to increase the amount of slurry stored in the pad area of ​​the mesh, thereby ensuring and improving the printing quality when the metal screen is printed.

[0005] The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: the utility model includes a mesh, on which a pad area part and a non-pad area are provided, the pad area part is provided with a pad and a harpoon, the pad and the harpoon have different vertical section heights, and the pad and the harpoon have openings with different diameters in their horizontal sections.

[0006] Preferably, the mesh includes horizontally and vertically crossed nickel mesh wires, the nickel mesh wires include pad nickel mesh wires and non-pad nickel mesh wires, and the pad nickel mesh wires pass through the harpoon and the pad.

[0007] Preferably, the pad is arranged in a pad area portion, the pad is arranged on a pad nickel mesh wire in a vertical direction, and an empty groove is arranged in the center of the pad.

[0008] Preferably, the harpoon is horizontally symmetrical, a fork head is provided at the place where the harpoon on one side is connected to the nickel mesh wire of the welding pad, fork wires are connected to the left and right sides of the fork head, and a gap is provided between the fork wires.

[0009] Preferably, the cross-sectional heights of all the pad nickel mesh wires in the pad area remain consistent, and the cross-sectional heights of the pad nickel mesh wires are higher than the cross-sectional heights of the non-pad nickel mesh wires on both sides.

[0010] Preferably, the pad area portion includes pad nickel mesh wires of two heights, and the cross-sectional heights of adjacent pad nickel mesh wires are different, wherein the pad nickel mesh wire with a lower cross-sectional height is the same as the cross-sectional height of the non-pad nickel mesh wires on both sides.

[0011] Preferably, the pad area portion includes pad nickel mesh wires of two heights, two rows of pad nickel mesh wires with higher cross-sectional heights are arranged adjacent to each other, a row of pad nickel mesh wires with lower heights is arranged between every two rows of pad nickel mesh wires with higher cross-sectional heights, and the pad nickel mesh wires in the pad area portion are arranged in an array according to the above-mentioned rule.

[0012] Preferably, the pad area is partially arranged at the center of the mesh.

[0013] Preferably, the thickness of the pad nickel mesh wire that passes through the harpoon and the pad is greater than the thickness of the non-pad nickel mesh wire that does not pass through the harpoon and the pad.

[0014] The beneficial effects of the utility model are as follows: in order to solve the problem of the uniform thickness of the mesh of the existing metal screen, the utility model increases the thickness of the vertical section at the pad and harpoon with a larger horizontal section opening in the pad area, reduces the fluidity of the slurry in this area, and enables more slurry to be stored in this area, thereby increasing the printing thickness of this area during printing. By using the above-mentioned metal screen that improves the thickness of the printing slurry in the local area, the problem of insufficient slurry height in the area where some pads are located during metal screen printing can be solved, and the impact on the conductivity of the printed battery cell can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model discloses a mesh structure diagram of a metal screen.

[0016] Figure 2 The utility model is a distribution structure diagram of a harpoon and a welding pad.

[0017] Figure 3 It is a vertical cross-sectional view of a nickel mesh wire of the utility model.

[0018] Figure 4 It is a vertical cross-sectional view of a nickel mesh wire of the utility model.

[0019] Figure 5 It is a vertical cross-sectional view of a nickel mesh wire of the utility model.

[0020] Figure 6It is a vertical cross-sectional view of a multi-shaped pad nickel mesh wire of the utility model.

[0021] In the figure, 1. pad area, 2. non-pad area, 3. pad, 4. harpoon, 4.1 fork head, 4.2 fork line, 5. pad nickel mesh line, 6. non-pad nickel mesh line. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0023] Embodiment 1: A metal screen of the present embodiment, when the existing metal screen is manufactured, it is impossible to ensure that all the pads 3 and the harpoon 4 openings in the pad 3 area are consistent. Some openings are larger. Under the same printing conditions, this part of the metal screen leaks less slurry per unit area during printing, resulting in a thinner printing thickness; some openings are smaller. Under the same printing conditions, this part of the metal screen leaks more slurry per unit area during printing, resulting in a thicker printing thickness. In view of the differences in printed battery cell models, it is impossible to ensure that the positions of different opening sizes correspond to the positions of the printed thickness of the battery cell. If the pad 3 opening is larger at the thicker part of the battery cell, it is impossible to store enough slurry. Therefore, when the rest of the printing is completed, the printing thickness of this part of the battery cell cannot meet the requirements, thereby affecting the overall conductivity and safety of the battery cell. In this embodiment, the above problems are solved by increasing the thickness of the pad 3 and the harpoon 4 at the larger opening, such as Figure 1 As shown, the area of ​​the metal screen used for printing is mesh, and the mesh is composed of a number of parallel horizontal and a number of parallel vertical nickel mesh wires. The mesh is divided into a pad area part 1 and a non-pad area part 2. The pad area part 1 is set at the center of the mesh, that is, the pad area part 1 is wrapped by the non-pad area part 2. The nickel mesh wire in the pad area part 1 is the pad nickel mesh wire 5, and the nickel mesh wire in the non-pad area part 2 is the non-pad nickel mesh wire 6. During the printing process, the pad area part 1 in the center of the mesh is immersed in the slurry. When the metal screen leaves the slurry, the pad 3 part stores part of the slurry and prints.

[0024] like Figure 2As shown, a pad 3 and a harpoon 4 are arranged in the pad area 1, and the pad 3 and the harpoon 4 are both arranged at the node where the vertical and horizontal pad nickel mesh wires 5 intersect. The pad nickel mesh wires 5 in the vertical direction are arranged in an array according to the set spacing, and an empty slot is provided in the center of the pad 3. After a number of pads 3 are spaced apart, a harpoon 4 is arranged between two pads 3, and the harpoon 4 is horizontally symmetrical. A fork head 4.1 is provided at the place where one side of the harpoon 4 is connected to the pad nickel mesh wire 5, and a fork wire 4.2 is connected to the left and right sides of the fork head 4.1, and a gap is provided between the fork wires 4.2. The other side of the harpoon 4 is symmetrical with the side along the horizontal line, and is also connected to the pad nickel mesh wire 5 with the fork head 4.1, and the cross section of the fork head 4.1 is rectangular. When the metal screen is printing, after the metal screen is immersed in the slurry and leaves, most of the slurry leaks directly from the hollow openings where the nickel mesh wires cross, and a small amount of slurry passes through the nodes where the nickel mesh wires 5 cross. After passing through the pads 3 and harpoons 4 on the nodes, part of the slurry will remain on the pads 3 and harpoons 4. When the metal screen is printing, the above slurry seeps down to complete the production of the battery cell.

[0025] Solve the problem of insufficient slurry storage at the pad 3 and the harpoon 4 with larger openings, such as Figure 2 and Figure 3 As shown, the vertical section height of the pad 3 and the harpoon 4 and the opening diameter of the horizontal section are set to different sizes according to the needs. The diameter of the horizontal section opening of the pad 3 and the harpoon 4 with larger openings is relatively large, so the thickness of the pad 3 and the harpoon 4 is increased, so in terms of expression, the thickness of the longitudinal section of the pad 3 and the harpoon 4 is increased. Although the openings of the pads 3 and the harpoon 4 in some areas are larger, after increasing the thickness of the longitudinal section, the time for the slurry to flow from the pads 3 and the harpoon 4 increases, so there will be more slurry stored in the pads 3 and the harpoon 4, and then when printing, the printed thickness of the battery cell at the position of the pads 3 and the harpoon 4 will be higher, ensuring the conductivity of the battery cell. In this embodiment, there are three ways to thicken the pad nickel mesh wire 5 at the pads 3 and the harpoon 4. The first type is that the cross-sectional height of all the pads 3 nickel mesh wires in the pad area 1 is consistent, and the cross-sectional height of the pad 3 nickel mesh wires is higher than the cross-sectional height of the non-pad nickel mesh wires 6 on both sides; the second type is that the pad area 1 includes two heights of pad nickel mesh wires 5, and the cross-sectional heights of adjacent pad nickel mesh wires 5 are different, wherein the pad nickel mesh wires 5 with lower cross-sectional height are the same as the cross-sectional heights of the non-pad nickel mesh wires 6 on both sides; the third type is that the pad area 1 includes two heights of pad nickel mesh wires 5, two columns of pad nickel mesh wires 5 with higher cross-sectional heights are arranged adjacent to each other, and a column of pad nickel mesh wires with lower heights is arranged between every two columns of pad nickel mesh wires 5 with higher cross-sectional heights, and the pad nickel mesh wires 5 of the pad area 1 are arranged in an array according to the above rules. According to actual printing requirements, through the above three arrangements, the thickness of the pads 3 and the harpoon 4 in the pad area 1 is increased, the storage capacity of the slurry is increased, and then the thickness of the part required for printing the battery cell is increased, thereby improving the conductivity of the battery cell.

[0026] In this embodiment, the horizontal opening of the center of the pad 3 at the intersection of the pad nickel mesh wire 5 on the manufactured metal screen is large, which makes it impossible to store enough slurry in the pad 3 and harpoon 4 for printing, resulting in insufficient thickness of the printed battery cell, which ultimately affects the conductive performance of the battery cell. The provided metal screen has different thicknesses of the pad nickel mesh wire 5 at the pad 3 and harpoon 4. The mesh provided on the screen includes a pad area part 1 and a non-pad area part 2. The longitudinal pad nickel mesh wire in the mesh is the warp, and the transverse pad nickel mesh wire is the weft. In the mesh area, the heights of different nodes in the local area along the warp and weft directions are not exactly the same, and are adjusted according to actual printing requirements. The pad area part 1 is set in the center of the mesh and the thickness of the pad nickel mesh wire 5 passing through the harpoon 4 and the pad 3 is greater than the thickness of the non-pad nickel mesh wire 6 that does not pass through the harpoon 4 and the pad 3. The pad 3 area part 1 is provided with a pad 3 and a harpoon 4, the pad 3 is arranged on a pad nickel mesh wire 5 in the vertical direction, an empty slot is arranged in the center of the pad 3, the harpoon 4 is horizontally symmetrical, a fork head 4.1 is arranged at the connection between the harpoon 4 and the pad nickel mesh wire 5 on one side, and fork wires 4.2 are connected to the left and right sides of the fork head 4.1, and a gap is arranged between the fork wires 4.2. The mesh is formed by horizontally and vertically crossed nickel mesh wires, the nickel mesh wires include pad 3 nickel mesh wires and non-pad 3 nickel mesh wires, and the pad 3 nickel mesh wires pass through the harpoon 4 and the pad 3. There are differences in the vertical cross-sectional heights of the pad 3 and the harpoon 4, and the horizontal cross-sectional heights of the pad 3 and the harpoon 4 are provided with openings of different diameters, and there are three ways of setting, including: the cross-sectional heights of all the pad nickel mesh wires 5 in the pad 3 area part 1 are kept consistent, and the cross-sectional heights of the pad nickel mesh wires 5 are all higher than the cross-sectional heights of the non-pad nickel mesh wires 6 on both sides; the pad area part 1 includes two heights of the pad nickel mesh wires 5, and the cross-sectional heights of adjacent pad nickel mesh wires 5 are different, wherein the pad nickel mesh wires 5 with lower cross-sectional heights are the same as the cross-sectional heights of the non-pad nickel mesh wires 6 on both sides; the pad area part 1 includes two heights of the pad nickel mesh wires 5, and two columns of pad nickel mesh wires 5 with higher cross-sectional heights are arranged adjacent to each other, and a column of pad nickel mesh wires 5 with lower heights is provided between every two columns of pad nickel mesh wires 5 with higher cross-sectional heights, and the pad nickel mesh wires 5 of the pad area part 1 are arranged in an array according to the above rule. By setting up in the manner described, after the metal screen of this embodiment completes the thickening of the mesh in the pad 3 or harpoon 4 area, the area can store more slurry, and the printing thickness of the area can be increased during printing. At the same time, the printing thickness of other areas can be kept unchanged, thereby improving the problem of insufficient slurry height in the pad 3 area during screen printing made of ordinary mesh, which affects the conductivity of the battery cell.

[0027] Embodiment 2: The overall structure of the metal screen in this embodiment is basically the same as that in Embodiment 1. Figure 1As shown, the area of ​​the metal screen used for printing is mesh, and the mesh is composed of a number of parallel horizontal and a number of parallel vertical nickel mesh wires. The mesh is divided into a pad area part 1 and a non-pad area part 2. The pad area part 1 is set at the center of the mesh, that is, the pad area part 1 is wrapped by the non-pad 3 area part 2. The nickel mesh wire in the pad area part 1 is the pad nickel mesh wire, and the nickel mesh wire in the non-pad area part 21 is the non-pad nickel mesh wire 6. During the printing process, the pad area part 1 in the center of the mesh is immersed in the slurry. When the metal screen leaves the slurry, the pad 3 part stores part of the slurry and prints.

[0028] like Figure 2 As shown, a pad 3 and a harpoon 4 are arranged in the pad area 1, and the pad 3 and the harpoon 4 are both arranged at the node where the vertical and horizontal pad nickel mesh wires 5 intersect. The pad nickel mesh wires 5 in the vertical direction are arranged in an array according to the set spacing, and an empty slot is provided in the center of the pad 3. After a number of pads 3 are spaced apart, a harpoon 4 is arranged between two pads 3, and the harpoon 4 is horizontally symmetrical. A fork head 4.1 is provided at the place where one side of the harpoon 4 is connected to the pad 3 nickel mesh wire, and a fork wire 4.2 is connected to the left and right sides of the fork head 4.1, and a gap is provided between the fork wires 4.2. The other side of the harpoon 4 is symmetrical with the side along the horizontal line, and is also connected to the pad nickel mesh wire 5 with the fork head 4.1, and the cross section of the fork head 4.1 is rectangular. When the metal screen is printing, after the metal screen is immersed in the slurry and leaves, most of the slurry leaks directly from the hollow openings where the nickel mesh wires cross, and a small amount of slurry passes through the nodes where the nickel mesh wires 5 cross. After passing through the pads 3 and harpoons 4 on the nodes, part of the slurry will remain on the pads 3 and harpoons 4. When the metal screen is printing, the above slurry seeps down to complete the production of the battery cell.

[0029] Solve the problem of insufficient slurry storage at the pad 3 and the harpoon 4 with larger openings, such as Figure 2 and Figure 3As shown, the vertical section height of the pad 3 and the harpoon 4 and the opening diameter of the horizontal section are set to different sizes according to the needs. The diameter of the horizontal section opening of the pad 3 and the harpoon 4 with larger openings is relatively large, so the thickness of the pad 3 and the harpoon 4 is increased, so in terms of expression, the thickness of the longitudinal section of the pad 3 and the harpoon 4 is increased. Although the openings of the pads 3 and the harpoon 4 in some areas are larger, after increasing the thickness of the longitudinal section, the time for the slurry to flow from the pads 3 and the harpoon 4 increases, so there will be more slurry stored in the pads 3 and the harpoon 4, and then when printing, the printed thickness of the battery cell at the position of the pads 3 and the harpoon 4 will be higher, ensuring the conductivity of the battery cell. In this embodiment, there are three ways to thicken the pad nickel mesh wire 5 at the pads 3 and the harpoon 4. The first type is that the cross-sectional heights of all the pad nickel mesh wires 5 in the pad area 1 are consistent, and the cross-sectional heights of the pad 3 nickel mesh wires are all higher than the cross-sectional heights of the non-pad nickel mesh wires 6 on both sides; the second type is that the pad 3 area 1 includes two heights of pad 3 nickel mesh wires, and the cross-sectional heights of adjacent pad nickel mesh wires 5 are different, among which the pad nickel mesh wires 5 with lower cross-sectional heights are the same as the cross-sectional heights of the non-pad 3 nickel mesh wires on both sides; the third type is that the pad 3 area 1 includes two heights of pad nickel mesh wires 5, two columns of pad nickel mesh wires 5 with higher cross-sectional heights are arranged adjacent to each other, and a column of pad nickel mesh wires 5 with lower heights is arranged between every two columns of pad nickel mesh wires 5 with higher cross-sectional heights, and the pad nickel mesh wires 5 in the pad area 1 are arranged in an array according to the above rules. According to actual printing needs.

[0030] In addition to the above three arrangements, in Example 1, only by changing the longitudinal section thickness of the pad nickel mesh wire 5, the storage of slurry at the pad 3 and the harpoon 4 is affected. Although the printing quality at the pad 3 and the harpoon 4 with large openings is improved to a certain extent, if the openings of the pad 3 and the harpoon 4 are too large, the expected slurry storage target cannot be achieved. In this embodiment, in addition to increasing the thickness of the pad 3 nickel mesh wire of the pad 3 and the harpoon 4 with larger openings, the cross-sectional shape of the pad nickel mesh wire 5 is changed at the same time. All the pad nickel mesh wires 5 in Example 1 have rectangular cross sections. In this embodiment, a semicircle or an arc can be added above the rectangular cross section according to actual needs, or the rectangular cross-sectional pad nickel mesh wire 5 can be directly changed to a trapezoidal pad nickel mesh wire 5. The above shape can improve the storage slurry amount of the pad 3 and the harpoon 4 to varying degrees from the structure itself. Under the premise of the same thickness of the pad 3 nickel mesh wire, the printing quality of the pad 3 and the harpoon 4 is further improved by changing the shape of the pad nickel mesh wire cross section 5, thereby improving the thickness of the part required for printing the battery cell, thereby improving the conductivity of the battery cell. Therefore, this embodiment aims at the problem that the mesh thickness of the existing metal screen is consistent but the openings of the pads 3 and the harpoon 4 are inconsistent, resulting in insufficient slurry storage in some areas affecting the printing quality. The utility model increases the thickness of the vertical section or uses the pad nickel mesh wire 5 with different cross-sectional shapes at the pad area part 1 where the horizontal section opening is larger, so as to reduce the fluidity of the slurry here, so that more slurry can be stored in this area, thereby increasing the printing thickness of this area during printing. The problem of insufficient slurry height in the area where some pads 3 are located during metal screen printing is solved, and the impact on the conductivity of the printed battery cell is reduced.

[0031] Embodiment 3: In this embodiment, the metal screen includes a mesh and a metal sheet. The pad area is provided with a mesh, and the non-pad area is provided with a metal sheet. The thickness of the metal sheet is less than or equal to the thickness of the mesh. Through the coordination of the mesh and the metal sheet, when the metal screen is immersed in the slurry, all the slurry can only partially leak out from the mesh area, ensuring that more slurry can be retained in the pad area, ensuring the printing quality. The pad and harpoon set in the pad area and the structure of the mesh part are the same as those in Embodiment 1.

Claims

1. A metal screen, characterized in that: The invention comprises a mesh, wherein a pad area part and a non-pad area are arranged on the mesh, the pad area part is provided with a pad and a harpoon, the pad and the harpoon have different vertical section heights, and the pad and the harpoon have openings with different diameters in horizontal sections.

2. A metal screen according to claim 1, characterized in that: The mesh includes horizontally and vertically crossed nickel mesh wires, the nickel mesh wires include pad nickel mesh wires and non-pad nickel mesh wires, and the pad nickel mesh wires pass through the harpoon and the pad.

3. A metal screen according to claim 2, characterized in that: The pad is arranged in a pad area portion, the pad is arranged on a pad nickel mesh line in a vertical direction, and an empty groove is arranged in the center of the pad.

4. A metal screen according to claim 1, characterized in that: The harpoon is horizontally symmetrical, and a fork head is provided at the place where the harpoon on one side is connected to the nickel mesh wire of the welding pad, and fork wires are connected to the left and right sides of the fork head, and a gap is provided between the fork wires.

5. A metal screen according to any one of claims 1 or 3, characterized in that: The cross-sectional heights of all the pad nickel mesh wires in the pad area are consistent, and the cross-sectional heights of the pad nickel mesh wires are higher than the cross-sectional heights of the non-pad nickel mesh wires on both sides.

6. A metal screen according to claim 3, characterized in that: The pad area portion includes pad nickel mesh wires of two heights, and the cross-sectional heights of adjacent pad nickel mesh wires are different, wherein the pad nickel mesh wire with a lower cross-sectional height is the same as the cross-sectional height of the non-pad nickel mesh wires on both sides.

7. A metal screen according to claim 5, characterized in that: The pad area portion includes two heights of pad nickel mesh wires, and the arrangement pattern of the pad nickel mesh wires is as follows: two rows of pad nickel mesh wires with higher cross-sectional heights are arranged adjacent to each other, and a row of pad nickel mesh wires with lower heights is arranged between every two rows of pad nickel mesh wires with higher cross-sectional heights. The pad nickel mesh wires in the pad area portion are arranged in an array according to the above pattern.

8. The metal screen according to claim 1, characterized in that: The pad area is partially arranged at the center of the mesh.

9. A metal screen according to claim 2, characterized in that: The thickness of the pad nickel mesh wire that passes through the harpoon and the pad is greater than the thickness of the non-pad nickel mesh wire that does not pass through the harpoon and the pad.

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