Fine grid screen printing plate, main grid screen printing plate and printing screen printing plate

Abstract

The utility model discloses a fine grid screen printing plate which comprises a bearing body and a plurality of fine grid lines arranged on the bearing body, the fine grid lines extend in the first direction, and the fine grid lines are arranged at intervals in the second direction. The thin grid line comprises a plurality of strip-shaped hollow parts arranged at intervals in the extending direction and penetrating small short lines located between the adjacent strip-shaped hollow parts, the penetrating small short lines and at least one of the strip-shaped hollow parts on the two sides are arranged at intervals, and when the thin grid electrode of the solar cell is printed, the line breaking problem in the sintering or welding process can be avoided. Therefore, the yield and the quality stability are ensured, and the efficiency is improved. In addition, the utility model further discloses a main grid screen printing plate and a printing screen printing plate. The printing screen comprises a screen frame and a fine grid screen or a main grid screen tensioned on the screen frame.

Description

[0001] Priority information

[0002] This application claims priority and benefits of patent application number 202422396136.0, entitled “Fine grid screen, main grid screen and printing screen”, filed with the State Intellectual Property Office of China on September 23, 2024, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of printing screens, and in particular to a fine grid screen, a main grid screen and a printing screen. Background Art

[0004] The printing screen is an important tool for printing the electrodes of solar cells. The slurry is poured onto the printing screen and moved on the printing screen with a scraper. The slurry is squeezed through the mesh holes on the printing screen and squeezed onto the solar cell, forming a corresponding pattern on the solar cell to form the electrode of the solar cell.

[0005] Conventional solar cells are printed on the surface of fine grid electrodes and main grid electrodes using a screen printing technique. The fine grid electrodes are used to collect current generated by light, while the main grid electrodes are used to collect current on the fine grid electrode lines. The fine grid screen of the printed screen is used to print the fine grid electrodes, while the main grid screen is used to print the main grid electrode. However, after printing the fine grid screen, the fine grid electrodes need to be sintered, and after printing the main grid screen, the main grid electrode needs to be sintered. This can easily lead to broken wires at the intersection of the fine grid electrode lines and the main grid electrode lines, resulting in reduced power of the solar cell and, in turn, overall power loss of the solar cell module. Summary of the Invention

[0006] Based on this, it is necessary to provide a new fine grid screen, main grid screen and printing screen assembly to solve the above technical problems.

[0007] A technical solution of the present application is: a fine grid screen, which includes a carrier and a plurality of fine grid lines arranged on the carrier, the fine grid lines extend along a first direction, and the plurality of fine grid lines are arranged at intervals in a second direction; the fine grid lines include a plurality of strip-shaped hollow portions arranged at intervals along the extension direction and through short lines located between adjacent strip-shaped hollow portions, and the through short lines are spaced apart from at least one of the strip-shaped hollow portions on both sides.

[0008] In one embodiment, the strip-shaped hollow portion includes a first hollow end and a second hollow end located on both sides of the through-small short line; the through-small short line is spaced apart from the first hollow end and the second hollow end respectively, or the through-small short line is spaced apart from the first hollow end and connected to the second hollow end, or the through-small short line is spaced apart from the second hollow end and connected to the first hollow end.

[0009] In one embodiment, the width D1 of the through short line ranges from 20μm≤D1≤80μm, the length L1 ranges from 200μm≤L1≤1200μm, and the length direction extends along the first direction; the width D2 of the strip-shaped hollow portion ranges from 6μm≤D2≤18μm.

[0010] In one embodiment, the through short line is spaced apart from the first hollow end and the second hollow end, and the spacing range is 80μm-150μm; or the through short line is connected to the first hollow end or the second hollow end, and the spacing range with the second hollow end or the first hollow end is 160-300μm.

[0011] In one embodiment, the penetrating short lines are in the shape of a rectangle, a waist-shaped hole, or a parallelogram.

[0012] In one embodiment, the first hollow end is a first gradient section with a gradually changing width and / or the second hollow end is a second gradient section with a gradually changing width.

[0013] In one embodiment, the first gradient section gradually decreases from the width adjacent to the through-short line to the width of the strip-shaped hollow portion, the width at the widest point of the first gradient section is smaller than the width of the through-short line, and the length of the first gradient section is smaller than the length of the through-short line; the second gradient section gradually decreases from the width adjacent to the through-short line to the width of the strip-shaped hollow portion, the width at the widest point of the second gradient section is smaller than the width of the through-short line, and the length of the second gradient section is smaller than the length of the through-short line.

[0014] In one embodiment, the fine grid screen also includes welding grid lines interspersed among the several fine grid lines, the welding grid lines extend along the first direction and include several strip-shaped hollow sections and positions to be welded arranged between adjacent strip-shaped hollow sections, and the positions to be welded are arranged adjacent to the through-short lines.

[0015] The present invention also discloses a main grid plate, which includes a base layer and a plurality of main grid lines arranged on the base layer, wherein the main grid lines extend along a second direction, and a plurality of the main grid lines are arranged at intervals along a first direction, and the main grid lines include a hollow main rod and a plurality of hollow connecting branches arranged at intervals along the hollow main rod and matched with the above-mentioned through-short lines.

[0016] In one embodiment, the fine grid screen includes a welding grid line, the welding grid line includes a strip-shaped hollow section and a position to be welded, and the main grid line includes a hollow harpoon portion located at the end of the hollow main rod and a hollow welding pad matched with the position to be welded.

[0017] The utility model also discloses a printing screen, which comprises a screen frame and the fine grid screen or the main grid screen as described above, which is tensioned in the screen frame.

[0018] The beneficial effects of the present application are as follows: the fine grid screen is provided with short lines running through it, which can avoid the problem of wire breakage during sintering or welding when printing the fine grid electrodes of solar cells, thereby ensuring the yield and quality stability and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the planar distribution of the fine grid lines and welding grid lines of the fine grid screen of this application;

[0020] Figure 2 for Figure 1 Enlarged schematic diagram of the middle circle A;

[0021] Figure 3 for Figure 1 Enlarged schematic diagram of the middle circle B;

[0022] Figure 4 Another partial schematic diagram of the fine grid lines of the fine grid screen of this application;

[0023] Figure 5 Another partial schematic diagram of the fine grid lines of the fine grid screen of this application;

[0024] Figure 6 This is a schematic diagram of the planar distribution of the busbar lines of the busbar grid plate of this application;

[0025] Figure 7 for Figure 6 Enlarged schematic diagram of the middle circle C;

[0026] Figure 8 It is an enlarged schematic diagram of circle D in circle 6;

[0027] Figure 9 This is a schematic diagram of the superposition of the fine grid screen and the main grid screen of the printing screen of this application;

[0028] Figure 10 for Figure 9 Enlarged schematic diagram of the middle circle E;

[0029] Figure 11 for Figure 9 Enlarged schematic diagram of the middle circle F;

[0030] Figure 12 for Figure 9 Schematic diagram of the intersection of the main grid line and the fine grid line. DETAILED DESCRIPTION

[0031] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described below. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0032] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementations.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The utility model discloses a fine grid screen, which includes a carrier and a plurality of fine grid lines arranged on the carrier. The fine grid lines extend along a first direction, and the plurality of fine grid lines are spaced apart in a second direction. The fine grid lines include a plurality of strip-shaped hollow portions spaced apart along the extension direction and short through lines between adjacent strip-shaped hollow portions, and the short through lines are spaced apart from at least one of the strip-shaped hollow portions on both sides. The strip-shaped hollow portions and the short through lines are both arranged through the carrier, and the carrier is at least one or two metal layers stacked together. When printing the fine grid electrodes of solar cells, the problem of wire breakage during sintering or welding can be avoided, thereby ensuring the yield and quality stability and improving efficiency.

[0035] Furthermore, the strip-shaped hollow portion includes a first hollow end and a second hollow end located on both sides of the through-short line. The through-short line is spaced apart from the first hollow end and the second hollow end, or the through-short line is spaced apart from the first hollow end and connected to the second hollow end, or the through-short line is spaced apart from the second hollow end and connected to the first hollow end.

[0036] In one embodiment, the width D1 of the short line is in the range of 20 μm≤D1≤80 μm, the length L1 is in the range of 200 μm≤L1≤1200 μm, and the length direction thereof extends along the first direction; the width D2 of the strip-shaped hollow portion is in the range of 6 μm≤D2≤18 μm.

[0037] In one embodiment, the through short line is spaced apart from the first hollow end and the second hollow end, and the spacing range is 80 μm-150 μm.

[0038] In one embodiment, the short line is connected to the first hollow end or the second hollow end, and the interval between the short line and the second hollow end or the first hollow end is in the range of 160 μm-300 μm.

[0039] In one embodiment, the through-line is rectangular, waist-shaped, or parallelogram-shaped. The through-line is generally long and extends in a first direction. Its ends may be right-angled, arc-shaped, sharp-angled, or irregularly shaped. The two sides in the length direction may be parallel straight lines, non-parallel straight lines, curves, arcs, or broken lines.

[0040] In one embodiment, the first hollow end is a first gradient section with a gradual width change and / or the second hollow end is a second gradient section with a gradual width change. Both the first hollow end and the second hollow end can be set to have a gradual width change to increase connectivity. Specifically, the first gradient section gradually decreases from the width adjacent to the running short line to the width of the strip-shaped hollow portion, the width of the widest part of the first gradient section is smaller than the width of the running short line, and the length of the first gradient section is smaller than the length of the running short line; the second gradient section gradually decreases from the width adjacent to the running short line to the width of the strip-shaped hollow portion, the width of the widest part of the second gradient section is smaller than the width of the running short line, and the length of the second gradient section is smaller than the length of the running short line.

[0041] In one embodiment, the fine grid screen also includes welding grid lines interspersed among the several fine grid lines. The welding grid lines extend along the first direction and include several strip-shaped hollow sections and positions to be welded arranged between adjacent strip-shaped hollow sections. The positions to be welded are arranged adjacent to the short lines.

[0042] The utility model also discloses a busbar grid plate, comprising a base layer and a plurality of busbars disposed on the base layer. The busbars extend along a second direction and are spaced apart along a first direction. The busbars comprise a hollow main bar and a plurality of hollow connecting branches spaced apart along the hollow main bar and matching the aforementioned through-short wires. The busbars comprise a hollow harpoon portion at the end of the hollow main bar and a hollow pad matching the position to be welded.

[0043] The utility model also discloses a printing screen, comprising a screen frame and a fine grid screen or a main grid screen as described above, tensioned within the screen frame. The fine grid screen and the main grid screen avoid wire breakage caused by sintering or welding when printing electrodes for solar cells, thereby improving yield, efficiency, and stability.

[0044] Please refer to the following Figures 1 to 12 , the fine grid screen, main grid screen and printing screen assembly of the present invention are described with examples.

[0045] Please refer to Figures 1 to 3 The utility model discloses a fine grid screen 100, which includes a carrier (not shown) and a plurality of fine grid lines 101 arranged on the carrier. The direction in which the fine grid lines 101 extend is defined as a first direction X, and the plurality of fine grid lines 101 are spaced apart in a second direction Y perpendicular to the first direction X. The fine grid lines 101 include a plurality of strip-shaped hollow portions 1 spaced apart along the first direction X of extension and small through lines 2 between adjacent strip-shaped hollow portions 1. The small through lines 2 are spaced apart from at least one of the strip-shaped hollow portions 1 on both sides. The small through lines 2 are widened relative to the strip-shaped hollow portions 1. Both the strip-shaped hollow portions 1 and the small through lines 2 are arranged to pass through the carrier, and the carrier is at least a one-layer or two-layer metal stacking arrangement. When printing the fine grid electrodes of solar cells (not shown), the problem of wire breakage during sintering or welding can be avoided, thereby ensuring the yield and quality stability and improving efficiency.

[0046] The strip-shaped hollow portion 1 includes a first hollow end 11 and a second hollow end 12 located on either side of the through-line 2. It can be considered that the two ends of a strip-shaped hollow portion 1 are the first hollow end 11 and the second hollow end 12, respectively. Several strip-shaped hollow portions 1 are arranged end to end along the first direction X. The first hollow end 11 of a strip-shaped hollow portion 1 is spaced apart from the second hollow partition 12 of another adjacent strip-shaped hollow portion 1, and a through-line 2 is provided in the gap. In this embodiment, the through-line 2 is spaced apart from the first hollow end 11 and the second hollow end 12. The width D1 of the short line 2 is in the range of 20 μm ≤ D1 ≤ 80 μm, for example, 20 μm, 40 μm, 60 μm, 80 μm, etc. The length L1 is in the range of 200 μm ≤ L1 ≤ 1200 μm, for example, 200 μm, 400 μm, 600 μm, 800 μm, 1200 μm, etc., and its length direction extends along the first direction X. The width D2 of the strip-shaped hollow portion 2 is in the range of 6 μm ≤ D2 ≤ 18 μm, for example, 6 μm, 8 μm, 12 μm, 15 μm, 18 μm, etc., and the strip-shaped hollow portion 2 has a uniform width as a whole. The distance between the short line 2 and the first hollow end 11 and the second hollow end 12 ranges from 80 μm to 150 μm. For example, the distance between the short line 2 and the first hollow end 11 and the second hollow end 12 is 80 μm, 120 μm, 150 μm, etc. In other embodiments, the distance between the short line 2 and the first hollow end 11 and the second hollow end 12 is different. For example, the distance between the short line 2 and the first hollow end 11 is 100 μm, and the distance between the short line 2 and the second hollow partition 12 is 130 μm.

[0047] In this embodiment, the through-line 2 is a rectangular hole. In other embodiments, the through-line 2 can also be a waist-shaped hole, a parallelogram, or other long strip shape. The two sides in the longitudinal direction are parallel straight lines. In other embodiments, the two sides are curved lines, arcs, or broken lines.

[0048] Please continue reading Figures 1 to 3 The first hollow end 11 includes a first gradient section 111 with a gradually changing width, and the second hollow end 12 includes a second gradient section 121 with a gradually changing width. The first gradient section 111 has a maximum width adjacent to the short line 2 and gradually decreases to the width of the strip-shaped hollow portion 1. The length of the first gradient section 111 is less than the length of the short line 2. The length of the first gradient section 111 ranges from 100μm to 500μm. The second gradient section 121 has a maximum width adjacent to the short line 2 and gradually decreases to the width of the strip-shaped hollow portion 1. The length of the second gradient section 121 is less than the length of the short line 2. The length of the second gradient section 121 ranges from 100μm to 500μm.

[0049] The fine grid screen 100 further includes welding grid lines 102 interspersed among the fine grid lines 101. The welding grid lines 102 extend along the first direction X and include a plurality of strip-shaped hollow sections 3 and welding positions 4 disposed between adjacent strip-shaped hollow sections 3. The welding positions 4 are disposed adjacent to the through-short lines 2.

[0050] Please refer to Figure 4 In another embodiment of the fine grid screen of the present invention, the strip-shaped hollow portion 1 of the fine grid line includes a first hollow end 13 and a second hollow end 14. The through-line short line 5 is spaced apart from the first hollow end 13, with the spacing ranging from 160μm to 300μm. The through-line short line 5 is connected to the second hollow end 14. The first hollow end 13 includes a first gradient section 131 with a gradually changing width.

[0051] Please refer to Figure 5 In another embodiment of the fine grid screen of the present invention, the strip-shaped hollow portion 1 of the fine grid line includes a first hollow end 15 and a second hollow end 16. The through-line short line 6 is spaced apart from the second hollow end 16, with the spacing ranging from 160μm to 300μm. The through-line short line 6 is connected to the first hollow end 15. The second hollow end 16 includes a second gradient section 161 with a gradually varying width.

[0052] Please refer to Figures 6 to 8The present invention discloses a main grid plate 200. The main grid plate 200 includes a base layer (not shown) and a plurality of main grid lines 7 arranged on the base layer. The main grid lines 7 extend along the second direction Y, and the plurality of main grid lines 7 are arranged at intervals along the first direction X. The main grid line 7 includes a hollow main rod 71, a plurality of hollow connecting branches 72 spaced apart along the hollow main rod 71, a hollow harpoon portion 73 located at the end of the hollow main rod 71, and a hollow soldering pad 74 provided on the hollow main rod 71. The hollow harpoon portion 73 includes a welding base 731, two oppositely arranged forks 732 extending from the welding base 731, a fishbone portion 733 located between the two forks 732, and a whisker portion 734 spaced apart at the end of the fork 732. Soldering feet 741 extend from both sides of the hollow soldering pad 74.

[0053] The present invention also discloses a printing screen 300, which includes a screen frame (not shown) and a fine grid screen 100 or a main grid screen 200 stretched on the screen frame. When the printing screen 300 is used to print the electrodes of a solar cell, the fine grid screen 100 and the main grid screen 200 are printed separately, but the fine grid screen 100 and the main grid screen 200 are matched. Figures 9 to 12 For example, the hollow connecting branch 72 matches the through-line 2, and the hollow solder pad 74 matches the soldering position 4. After the fine grid 100 and the main grid 200 are printed and sintered, the electrodes of the solar cell formed avoid disconnection problems, improving yield and efficiency.

[0054] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail above with reference to the accompanying drawings. In the above description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described above, and those skilled in the art can make similar improvements without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed above. In addition, the various technical features of the embodiments described above can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A fine grid screen, characterized in that: It includes a carrier and a number of fine grid lines arranged on the carrier, the fine grid lines extend along a first direction, and the fine grid lines are arranged at intervals in a second direction; the fine grid lines include a number of strip-shaped hollow portions arranged at intervals along the extension direction and a through short line located between adjacent strip-shaped hollow portions, and the through short line is spaced apart from at least one of the strip-shaped hollow portions on both sides.

2. The fine grid screen according to claim 1, characterized in that: The strip-shaped hollow portion includes a first hollow end and a second hollow end located on both sides of the through-small short line; the through-small short line is spaced apart from the first hollow end and the second hollow end respectively, or the through-small short line is spaced apart from the first hollow end and connected to the second hollow end, or the through-small short line is spaced apart from the second hollow end and connected to the first hollow end.

3. The fine grid screen according to claim 2, characterized in that: The width D1 of the short line is in the range of 20 μm≤D1≤80 μm, the length L1 is in the range of 200 μm≤L1≤1200 μm, and the length direction thereof extends along the first direction; the width D2 of the strip-shaped hollow portion is in the range of 6 μm≤D2≤18 μm.

4. The fine grid screen according to claim 2, characterized in that: The through short line is spaced apart from the first hollow end and the second hollow end respectively, and the spacing range is 80μm-150μm; or the through short line is connected to the first hollow end or the second hollow end, and the spacing range with the second hollow end or the first hollow end is 160-300μm.

5. The fine grid screen according to claim 1, characterized in that: The penetrating short lines are in the shape of a rectangle, a waist-shaped hole or a parallelogram.

6. The fine grid screen according to claim 2, characterized in that: The first hollow end is a first gradient section with a gradually changing width and / or the second hollow end is a second gradient section with a gradually changing width.

7. The fine grid screen according to claim 6, characterized in that: The first gradient section gradually decreases in width from the width adjacent to the through-short line to the width of the strip-shaped hollow portion, the width of the widest part of the first gradient section is smaller than the width of the through-short line, and the length of the first gradient section is smaller than the length of the through-short line; The width of the second gradient section gradually decreases from the width adjacent to the through-short line to the width of the strip-shaped hollow portion, the width of the widest part of the second gradient section is smaller than the width of the through-short line, and the length of the second gradient section is smaller than the length of the through-short line.

8. The fine grid screen according to claim 1, characterized in that: The fine grid screen also includes welding grid lines interspersed among the fine grid lines. The welding grid lines extend along a first direction and include a plurality of strip-shaped hollow sections and positions to be welded arranged between adjacent strip-shaped hollow sections. The positions to be welded are arranged adjacent to the through-short lines.

9. A main grid plate, characterized in that: The main grid plate includes a base layer and a plurality of main grid lines arranged on the base layer, the main grid lines are extended along the second direction, and the plurality of main grid lines are arranged at intervals along the first direction. The main grid lines include a hollow main rod and a plurality of hollow connecting branches arranged at intervals along the hollow main rod and matched with the through short lines described in any one of claims 1 to 8.

10. A printing screen, characterized in that: The invention comprises a screen frame and the fine grid screen according to any one of claims 1 to 8 or the main grid screen according to claim 9 which is stretched in the screen frame.

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