Full-opening steel plate for printing and printing equipment

Abstract

The invention belongs to the technical field of electrode printing, and discloses a full-opening steel plate for printing and printing equipment. The full-opening steel plate for printing comprises a first metal layer and a second metal framework layer, and the first metal layer is provided with a printing opening used for printing a whole fine grid at a time. The second metal framework layer is stacked on one side of the first metal layer, the side, away from the first metal layer, of the second metal framework layer is an S face, the second metal framework layer is provided with a plurality of slurry penetrating channels penetrating from the S face to the printing opening at intervals, and connecting bridges and slurry penetrating holes are alternately arranged between every two adjacent slurry penetrating channels. A slurry storage cavity is formed in the bottom of the second metal framework layer. According to the full-opening steel plate for printing, during printing, slurry is stored through the slurry penetrating holes and the slurry storage cavities which are vertically arranged in a layered mode, so that slurry supply of the printing openings is guaranteed, gaps caused by insufficient supply of slurry at the positions, corresponding to the connecting bridges, of the fine grids are avoided, meanwhile, the printing height is effectively controlled, and the printing quality is improved. And the printing quality and the printing cost control of the battery piece are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrode printing, and in particular to a fully-opened steel plate for printing and a printing device. Background Art

[0002] The fully open steel plate is a new type of screen in screen printing technology. Its opening area directly penetrates the material to form a completely open channel for printing conductive paste, so that a long fine grid can be formed on the surface of the battery cell at one time.

[0003] In order to ensure the integrity of the layout, the traditional fully open steel plate has gaps at the local position of the fine grid. Therefore, the fine grid printed once has gaps, and another steel plate needs to be used for secondary printing to fill the gap position, so as to complete the printing of the complete pattern. In order to ensure the strength, the grid line gap width is set at 0.2mm-1mm. The gap width is much larger than the width of the photovoltaic solar cell main grid connection line. It is necessary to add centipede feet at the main grid connection line for overlapping interconnection, and increase the wet weight of the main grid printing slurry. In addition, there are overlap accuracy issues with the centipede foot design and the fine grid at the main grid connection line. When the overlap is offset, the current collection capacity is insufficient or even cannot be collected, affecting the conversion efficiency of the battery cell. In order to reduce the position offset caused by overprinting and the increase in silver paste costs caused by overprinting, and to improve the strength of the fully-opened steel plate, the existing fully-opened steel plate is a double-layer structure, the lower layer of which has multiple openings with the same length as the fine grid, and the upper layer has leakage holes with the same length as the opening corresponding to each opening, but the leakage holes are not completely through, and multiple connecting bridge structures (such as connecting wires) are retained in the middle of the leakage holes for connecting the two sides of the leakage holes.

[0004] From the above, the traditional full-opening steel plate cannot complete the printing of fine grids in one go, but the full-opening steel plate with a connecting bridge structure will block the slurry from flowing into the opening. In addition, the poor fluidity of the slurry will cause a gap in the position of the connecting bridge structure corresponding to the printed fine grid. Not only can the current in the gap area not be effectively collected, affecting the electrical performance of the battery cell; but also a hot spot effect may occur at the gap, which will accelerate the aging of the photovoltaic module and may even burn the photovoltaic module in severe cases.

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

[0006] The object of the present invention is to provide a full-opening steel plate and printing equipment for printing, so as to improve the printing accuracy while ensuring the strength of the full-opening steel plate, and finally improve the production quality of battery cells.

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

[0008] A fully open steel plate for printing, the fully open steel plate for printing comprising at least:

[0009] A first metal layer is formed with a printing port for printing an entire fine grid in a single pass; and

[0010] A second metal skeleton layer is stacked on one side of the first metal layer, the side of the second metal skeleton layer facing away from the first metal layer is an S surface, and the second metal skeleton layer is provided with a plurality of slurry permeable channels at intervals along the length direction of the printing port, and the plurality of slurry permeable channels all penetrate from the S surface to the printing port;

[0011] A reinforcement area is formed between two adjacent slurry permeable channels, and at least one slurry permeable hole is arranged inside the reinforcement area to form a connecting bridge between the slurry permeable hole and the slurry permeable channel. A slurry storage cavity for storing slurry is arranged on the side of the second metal skeleton layer away from the S surface corresponding to the position of the reinforcement area, and the slurry storage cavity connects the slurry permeable hole and the two adjacent slurry permeable channels.

[0012] Preferably, the slurry storage chamber comprises:

[0013] a main cavity, arranged along the length direction of the printing port; and

[0014] The connecting cavity is arranged between the two ends of the main cavity and the grout-permeable passage, and the volume of the connecting cavity gradually increases from the grout-permeable passage to the main cavity.

[0015] Preferably, a dimension of the slurry storage cavity along the thickness direction of the second metal skeleton layer is H, and H is 0-15 microns.

[0016] Preferably, a plurality of the grouting holes are arranged at intervals inside the reinforcement area so that the connection bridge is formed between two adjacent grouting holes.

[0017] Preferably, the boundary of the reinforcement zone is defined by a graphic projection of the slurry storage cavity along the thickness direction of the second metal skeleton layer onto the S surface.

[0018] Preferably, along the width direction of the grouting channel, the grouting holes are spaced apart from the boundary.

[0019] Preferably, the distance between the slurry-permeable hole and the boundary is L, and L is 1-20 microns.

[0020] Preferably, L is 2 microns or 3 microns.

[0021] Preferably, along the width direction of the grouting channel, the grouting holes are arranged parallel to the boundary at the side close to the boundary.

[0022] The printing device includes a frame, an ink supply mechanism, a pad printing mechanism and a fully-opened steel plate for printing. The ink supply mechanism, the pad printing mechanism and the fully-opened steel plate for printing are all arranged on the frame. The pad printing mechanism is used to print the slurry supplied by the ink supply mechanism onto a substrate through the fully-opened steel plate for printing to form a plurality of whole fine grids.

[0023] Beneficial effects of the present invention:

[0024] The fully-opened steel plate for printing of the present invention improves the strength of the fully-opened steel plate for printing by arranging a connecting bridge in the reinforced area, thereby ensuring the deformation resistance of the fully-opened steel plate for printing and extending the service life; during printing, slurry is simultaneously penetrated into the slurry storage cavity through the slurry penetration holes and the slurry penetration channels in the reinforced area, and the slurry storage cavity is used to store a certain amount of slurry on the back side of the reinforced area to ensure that sufficient slurry is supplied to the printing port, preventing the fine grid from having a gap at the position corresponding to the connecting bridge due to insufficient slurry supply, thereby ensuring the integrity of the fine grid, and also effectively controlling the printing height of the welding area, thereby improving the printing quality of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a top view of a fully-opened steel plate for printing of the present invention;

[0026] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0027] Figure 3 yes Figure 2 Cross-sectional view along the BB direction;

[0028] Figure 4 yes Figure 2 Sectional view along CC direction.

[0029] In the figure:

[0030] 1. First metal layer; 11. Printing port;

[0031] 2. Second metal skeleton layer; 21. Slurry permeation channel; 22. Reinforcement area; 221. Slurry permeation hole; 222. Connection bridge; 223. Boundary;

[0032] 3. Slurry storage cavity; 31. Main cavity; 32. Connecting cavity. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] Refer to the following Figures 1 to 4 The fully-opened steel plate for printing and the printing equipment provided by the present invention are described.

[0038] The printing device includes a frame, an ink supply mechanism, a pad printing mechanism and a fully-opened steel plate for printing. The ink supply mechanism, the pad printing mechanism and the fully-opened steel plate for printing are all connected to the frame. The pad printing mechanism is used to print the slurry supplied by the ink supply mechanism onto a substrate through the fully-opened steel plate for printing to form a plurality of whole fine grids.

[0039] The fully open steel plate for printing is intended to print at least a number of whole fine grids on a substrate at a time. The specific structure of the fully open steel plate for printing is shown in the following content;

[0040] Reference Figure 1 , Figure 2 and Figure 3The fully open steel plate for printing includes a first metal layer 1 and a second metal skeleton layer 2, and the second metal skeleton layer 2 is stacked on the side of the first metal layer 1 away from the substrate. In this embodiment, the first metal layer 1 and the second metal skeleton layer 2 are both horizontally arranged, and the first metal layer 1 and the second metal skeleton layer 2 are stacked in sequence from bottom to top for illustration. It should be noted that in some other embodiments, the first metal layer 1 and the second metal skeleton layer 2 can also be tilted to a certain extent, and the specific tilt angle is not limited.

[0041] Specifically, the first metal layer 1 is formed with a printing port 11 for printing at least one whole fine grid at a time. In this embodiment, a plurality of printing ports 11 are arranged in parallel on the first metal layer 1, so that a plurality of whole fine grids can be printed at one time. The side of the second metal skeleton layer 2 facing away from the printing port 11 is the S surface, that is, the top surface of the second metal skeleton layer 2 is the S surface. The second metal skeleton layer 2 is provided with a plurality of slurry permeation channels 21 at intervals along the length direction of each printing port 11. The plurality of slurry permeation channels 21 are all connected from the S surface to the printing port 11 (refer to Figure 4 ), each slurry passage 21 is opened along the length direction of the printing port 11 to supply a sufficient amount of slurry to the position inside the printing port 11 corresponding to the slurry passage 21.

[0042] Furthermore, a reinforcement area 22 is formed between two adjacent grouting channels 21, and at least one grouting hole 221 is arranged inside the reinforcement area 22, so that a connecting bridge 222 is formed between the grouting hole 221 and the grouting channel 21. A slurry storage cavity 3 for storing slurry is arranged at a position corresponding to the reinforcement area 22 on the side of the second metal skeleton layer 2 facing away from the S surface (i.e., the bottom of the second metal skeleton layer 2), and the slurry storage cavity 3 is connected to the slurry hole 221 and the two adjacent grouting channels 21.

[0043] From the above, first, the thickness of the fully open steel plate for printing is increased by stacking the first metal layer 1 and the second metal skeleton layer 2 to ensure the basic strength of the fully open steel plate for printing, and the strength of the second metal skeleton layer 2 is increased by the connecting bridge 222 of the reinforcement area 22, so that the second metal skeleton layer 2 is not easy to deform, and finally the strength of the fully open steel plate is improved.

[0044] Secondly, by arranging a slurry storage chamber 3 connected to the slurry holes 221 and the slurry channels 21 at the bottom of each reinforced area 22, that is, the slurry holes 221 and the slurry storage chamber 3 located above the printing port 11 can store sufficient slurry. When printing, the slurry will flow to the printing port 11 under the action of its own gravity, so that the position of the printing port 11 corresponding to the connecting bridge 222 also ensures sufficient slurry supply, that is, taking into account both the strength and printing quality of the full-open steel plate for printing.

[0045] Reference Figure 4Each slurry storage chamber 3 includes a main chamber 31 and a connecting chamber 32. The main chamber 31 is arranged along the length direction of the printing port 11. The connecting chamber 32 is arranged between the two ends of the main chamber 31 and the slurry permeable channel 21. The volume of the connecting chamber 32 gradually increases from the slurry permeable channel 21 to the main chamber 31. The connecting chamber 32 serves as a transition to connect the main chamber 31 with the slurry permeable channel 21 and guide the slurry, so that the slurry in the slurry permeable channel 21 can flow into the main chamber 31 more smoothly, so as to ensure the slurry supply of the main chamber 31.

[0046] Exemplarily, the first metal layer 1 is deposited on the substrate by an electroforming process, and its printing port 11 is formed by photolithography and etching. The width of each printing port 11 is 5-20 microns, and this embodiment only takes 10 microns as an example, and an expansion portion is provided locally at the printing port 11, and the pulp storage cavity 3 is provided at the expansion portion. The width of the expansion portion is 110 microns as an example to ensure the integrity of the printed image here. The second metal skeleton layer 2 is superimposed by magnetron sputtering, and a pulp channel 21, a pulp storage cavity 3 and a pulp hole 221 are formed by laser engraving, wherein the width of the main cavity 31 of the pulp storage cavity 3 is 80-120 microns, and this embodiment only takes 80 microns as an example, so as to ensure the pulp supply to the printing port 11.

[0047] In addition, the size of the slurry storage cavity 3 along the thickness direction of the second metal skeleton layer 2 is H, and H is 0-15 microns. Specifically, the thickness of the first metal layer 1 is 5-25 microns, and this embodiment only takes 20 microns as an example; in some other embodiments, the thickness of the first metal layer 1 can also be 5, 10, 15 or 25 microns. The thickness of the second metal skeleton layer 2 is 5-30 microns, and this embodiment only takes 25 microns as an example. In some other embodiments, the second metal skeleton layer 2 can also be 5, 10, 15, 20 or 30 microns.

[0048] As described above, limiting the depth of the slurry storage cavity 3 to 0-15 microns can ensure the thickness of the reinforcement area 22, thereby ensuring the strength of the second metal skeleton layer 2; preferably, H in this embodiment is 10 microns, so as to take into account both the strength of the second metal skeleton layer 2 and the capacity of the slurry storage cavity 3. In some other embodiments, H can also be 0.5, 2, 5, 10 or 15 microns.

[0049] Reference Figure 2 , a plurality of slurry permeation holes 221 are arranged at intervals along the length direction of the printing port 11 inside the reinforcement area 22, so that a connecting bridge 222 is formed between two adjacent slurry permeation holes 221. Specifically, a plurality of slurry permeation holes 221 are provided in the area corresponding to the main cavity 31 and the area of ​​the connecting cavity 32, thereby increasing the total slurry permeation area of ​​the reinforcement area 22, that is, the total slurry permeation area is much larger than the area of ​​all the connecting bridges 222, so as to increase the slurry permeation amount of the reinforcement area 22 and ensure the slurry supply of the slurry storage cavity 3.

[0050] In order to ensure the strength of the reinforced area 22, the boundary 223 of the reinforced area 22 is projected onto the S surface through the slurry storage cavity 3 along the thick part direction of the second metal skeleton layer 2 (i.e. Figure 2 The position of the slurry hole 221 is limited to the projection figure of the slurry storage chamber 3, that is, the slurry hole 221 does not exceed the range of the slurry storage chamber 3. It can be understood that along the width direction of the slurry passage 21, the edge of the slurry hole 221 is at most flush with the boundary 223 of the reinforcement area 22, thereby improving the strength of the reinforcement area 22 by limiting the position of the slurry hole 221. Optionally, in some other embodiments, the boundary 223 of the reinforcement area 22 in the width direction of the printing port 11 may exceed the figure of the slurry storage chamber 3 projected to the S surface.

[0051] Furthermore, along the width direction of the slurry penetration channel 21, the slurry penetration hole 221 and the boundary 223 of the reinforcement area 22 are spaced apart, so that a gap is left between the slurry penetration hole 221 and the boundary 223 of the reinforcement area 22, which not only improves the strength of the reinforcement area 22, but also, compared with designing the side of the slurry penetration hole 221 to be flush with the boundary 223 of the reinforcement area 22, it can make the slurry penetration hole 221 produce an error in the width direction of the printing port 11, thereby reducing the processing difficulty.

[0052] Reference Figure 2 For example, along the width direction of the slurry permeation channel 21, the distance between the slurry permeation hole 221 and the boundary 223 of the reinforcement area 22 is L, and L is 1-20 microns. In this embodiment, L is preferably 3 microns. When L is 3 microns, the length of the slurry permeation hole 221 in the width direction of the printing port 11 is ensured while a sufficient amount of processing error is reserved, so that the slurry permeation effect of the slurry permeation hole 221 is better. In some other embodiments, L may also be 1, 2, 5 or 20 microns.

[0053] Optionally, the grouting hole 221 connected to the main cavity 31 is the first grouting hole, and the grouting hole 221 connected to the connecting cavity 32 is the second grouting hole. The first grouting hole is in the shape of a rectangle, and two opposite sides of the rectangle are parallel to the width direction of the printing port 11, so that the first grouting hole is parallel to the boundary 223 of the reinforcement area 22, that is, the distance between the first grouting hole and the boundary 223 of the reinforcement area 22 is uniform, which helps to improve the strength at the first grouting hole. The second grouting hole is in the shape of a trapezoid, and the two oblique sides of the trapezoid are parallel to the boundary 223 of the reinforcement area 22, that is, the spacing between the second grouting hole and the boundary 223 of the reinforcement area 22 is uniform, which helps to improve the strength at the second grouting hole. Finally, the overall strength of the reinforcement area 22 is improved. Of course, in some other embodiments, the grouting hole 221 can also be other shapes such as a square and a pentagon.

[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 should be included in the protection scope of the claims of the present invention.

Claims

1. A fully open steel plate for printing, characterized in that: The fully open steel plate for printing at least comprises: A first metal layer (1) is formed with a printing port (11) for printing a whole fine grid in a single pass; and A second metal skeleton layer (2) is stacked on one side of the first metal layer (1), the side of the second metal skeleton layer (2) facing away from the first metal layer (1) being an S surface, the second metal skeleton layer (2) being provided with a plurality of slurry-permeable channels (21) at intervals along the length direction of the printing port (11), the plurality of slurry-permeable channels (21) all passing through from the S surface to the printing port (11); A reinforcement area (22) is formed between two adjacent slurry permeable channels (21), at least one slurry permeable hole (221) is arranged inside the reinforcement area (22) so as to form a connecting bridge (222) between the slurry permeable hole (221) and the slurry permeable channel (21), and a slurry storage cavity (3) for storing slurry is arranged at a position corresponding to the reinforcement area (22) on a side of the second metal skeleton layer (2) away from the S surface, and the slurry storage cavity (3) is connected to the slurry permeable hole (221) and the two adjacent slurry permeable channels (21).

2. A fully open steel plate for printing according to claim 1, characterized in that: The slurry storage chamber (3) comprises: A main cavity (31) is arranged along the length direction of the printing port (11); and The connecting cavity (32) is arranged between the two ends of the main cavity (31) and the grout-permeable channel (21), and the volume of the connecting cavity (32) gradually increases in the direction from the grout-permeable channel (21) to the main cavity (31).

3. A fully open steel plate for printing according to claim 1, characterized in that: The dimension of the slurry storage cavity (3) along the thickness direction of the second metal skeleton layer (2) is H, and H is 0-15 microns.

4. A fully open steel plate for printing according to claim 1, characterized in that: A plurality of the grouting holes (221) are arranged at intervals inside the reinforcement area (22), so that a connecting bridge (222) is formed between two adjacent grouting holes (221).

5. A fully open steel plate for printing according to claim 1, characterized in that: The boundary (223) of the reinforcement area (22) is defined by a graphic projection of the slurry storage cavity (3) along the thick portion direction of the second metal skeleton layer (2) onto the S surface.

6. A fully open steel plate for printing according to claim 5, characterized in that: Along the width direction of the grouting channel (21), the grouting holes (221) and the boundary (223) are arranged at intervals.

7. A fully open steel plate for printing according to claim 6, characterized in that: The distance between the slurry-permeable hole (221) and the boundary (223) is L, and L is 1-20 microns.

8. A fully open steel plate for printing according to claim 7, characterized in that: L is 2 microns or 3 microns.

9. A fully open steel plate for printing according to claim 5, characterized in that: Along the width direction of the grouting channel (21), the grouting holes (221) are arranged close to the side of the boundary (223) and parallel to the boundary (223).

10. A printing device, characterized in that It comprises a frame, an ink supply mechanism, a pad printing mechanism and a fully-open steel plate for printing as described in any one of claims 1 to 9, wherein the ink supply mechanism, the pad printing mechanism and the fully-open steel plate for printing are all arranged on the frame, and the pad printing mechanism is used to print the slurry supplied by the ink supply mechanism onto a substrate through the fully-open steel plate for printing to form a plurality of whole fine grids.

Images