CN220465000U

CN220465000U - Metal screen printing plate convenient to conductive paste blanking

Info

Publication number: CN220465000U
Application number: CN202321783504.6U
Authority: CN
Inventors: 沈剑雄; 杨礼林; 王阿丽
Original assignee: Zhejiang Weizhu Technology Co ltd
Current assignee: Zhejiang Weizhu Technology Co ltd
Priority date: 2023-07-08
Filing date: 2023-07-08
Publication date: 2024-02-09
Anticipated expiration: 2033-07-08

Abstract

The utility model provides a metal screen printing plate convenient for blanking of conductive paste, which comprises the following components: at least two-layer metal plate that the stromatolite set up metal plate department has seted up a plurality of blanking district and will the shielding district that blanking district separates, the blanking district includes two at least blanking holes of upper and lower floor's width inequality, and wherein the width in lower floor's blanking hole is not greater than the width in upper strata blanking hole, the upper surface that shields the district sets up to resistance structure. Through the mode, the problems that the existing metal screen plate is smooth in surface, slurry easily and rapidly rolls through a blanking area during scraper printing, and the printing quality of a metal wire is poor are solved.

Description

Metal screen printing plate convenient to conductive paste blanking

Technical Field

The utility model relates to the field of photovoltaic cell printing screen plates, in particular to a metal screen plate convenient for blanking of conductive paste.

Background

The battery piece is one of core components of the solar photovoltaic panel, and a plurality of metal wires are printed on the battery piece. The vast majority of metal wires on battery cells currently require metal screens for printing. The forming quality of the metal wires directly influences the electric connection and stability between the grid lines on the battery piece and the shading area, and finally determines the overall quality, particularly the luminous efficiency, of the solar photovoltaic panel.

In the current metal wire printing process, the conductive paste permeates into the surface of the silicon wafer substrate through the grid of the surface layer of the metal screen plate to form the metal wire. However, since the surface of the metal screen is relatively smooth, the conductive paste can slide through some grids in the scraping process, so that no or little conductive paste permeates into part of the grids, and the quality of the finally formed metal wire is poor.

Disclosure of Invention

In order to solve the problems, the utility model provides a metal screen printing plate convenient for blanking of conductive paste, and solves the problems of poor printing quality of metal wires caused by smooth surface of the existing metal screen printing plate.

The main content of the utility model comprises: a metal screen convenient for blanking of conductive paste, comprising: at least two-layer metal plate that the stromatolite set up metal plate department has seted up a plurality of blanking district and will the shielding district that blanking district separates, the blanking district includes two at least blanking holes of upper and lower floor's width inequality, and wherein the width in lower floor's blanking hole is not greater than the width in upper strata blanking hole, the upper surface that shields the district sets up to resistance structure.

Preferably, the upper surface of the shielding region is provided with a raised structure and/or a recessed structure.

Preferably, the depth of the groove structure is smaller than or equal to the thickness of the first layer of metal mesh cloth.

Preferably, the shape of the convex structure or the concave groove structure is one or more of a combination of a circle, a rectangle, a diamond, a trapezoid, a triangle and a polygon.

Preferably, the upper surface of the shielding region is provided with microscopic wave-like relief surfaces and/or linear and circular wiredrawing.

Preferably, the orifice edge of the blanking hole is provided with a chamfer A.

Preferably, the width W1 of the lowermost blanking hole ranges from 5 micrometers to 95 micrometers.

Preferably, the width W2 of the uppermost blanking hole ranges from 1 micron to 45 microns.

Preferably, an adhesive layer is also arranged between two adjacent metal plates.

Preferably, the adhesive layer is metal.

Preferably, chamfer angles B are arranged at two ends of a shielding region between two adjacent blanking regions of the same layer.

The utility model has the beneficial effects that:

1. the upper surface of the shielding area of the metal plate is set to be a resistance structure, so that friction force during scraper printing is increased, conductive paste can fall onto the surface of the silicon substrate better through the blanking hole, a metal wire is formed better, printing quality of the metal wire is improved, and finally conductive stability of the solar cell is improved;

2. the blanking holes are arranged to be in a step shape with wide upper part and narrow lower part, and the conductive paste is easier to form in the printing process.

Drawings

FIG. 1 is a schematic diagram of a metal screen printing plate with a preferred embodiment for facilitating the blanking of conductive paste;

FIG. 2 is a schematic structural view of a metal plate;

FIG. 3 is a schematic view of section A-A of FIG. 2;

FIG. 4 is a schematic view in section B-B of FIG. 2;

fig. 5 is a schematic structural view of embodiment 2;

fig. 6 is a schematic structural view of embodiment 3;

FIG. 7 is a schematic view of the structure of embodiment 4

Fig. 8 is a schematic structural view of embodiment 5;

FIG. 9 is an enlarged partial schematic view of portion D of FIG. 2;

reference numerals: 1. metal screen frame, 2, polyester screen cloth, 3, hot melt adhesive, 4, metal plate, 5, blanking area, 6, shielding area, 7, chamfer A,8, chamfer B,51, first blanking hole, 52, second blanking hole.

Detailed Description

The technical scheme protected by the utility model is specifically described below with reference to the accompanying drawings.

Example 1

Fig. 1 is a metal screen plate convenient for blanking of conductive paste, which comprises a metal screen frame 1 at the most edge part, a metal plate 4 in the middle part, a hot melt adhesive 3 arranged on the outer side of the metal plate 4 in close contact with the metal plate, and a polyester screen cloth 2 arranged between the hot melt adhesive 3 and the metal screen frame 1. The polyester mesh cloth 2 is arranged in the metal mesh frame 1 through a stretched net, the metal plate 4 is arranged on the polyester mesh cloth 2 in the middle, and is fixedly bonded with the polyester mesh cloth 2 through the hot melt adhesive 3, and the polyester mesh cloth 2, the metal plate 4, the hot melt adhesive 3 and the metal mesh frame 1 are connected into a whole through top frame operation to form a silk screen printing screen of a solar cell.

As shown in fig. 2 and 3, the metal plate stack is provided with at least two layers, a plurality of blanking areas 5 (part a in fig. 2) and shielding areas 6 (parts other than part a in fig. 2) for separating the blanking areas are formed at the metal plate 4, the blanking areas 5 comprise first blanking holes 51 and second blanking holes 52 with unequal widths of upper and lower layers, the width W2 of the second blanking holes 52 is not greater than the width W1 of the first blanking holes 51, and the upper surface of the shielding areas 6 is provided with a resistance structure. Wherein the width W1 of the first blanking hole 51 ranges from 5 micrometers to 95 micrometers and the width W2 of the second blanking hole 52 ranges from 1 micrometer to 45 micrometers.

The resistance structure is arranged as a convex structure, the convex structure can form a grid, and the grid is in the shape of one or more of a circle, a rectangle, a diamond, a trapezoid, a triangle and a polygon.

In the process of scraping the conductive paste, as the upper surface of the shielding area 6 is provided with a resistance structure, a certain resistance can be increased, and the upper surface of the shielding area 6 is prevented from being too smooth, so that the conductive paste directly slides over the surface and does not fall into the blanking area 5. The conductive paste can be fully filled into each blanking area 5, so that a conductive circuit with better shape is formed on the surface of the substrate, and the conductive stability of the solar cell is improved.

As shown in fig. 4, a shielding area 6 is further arranged between the adjacent blanking areas 5, so that the metal plate 4 can be stretched more tightly, the screen stretching strength of the metal plate 4 can be better increased, and the printing service life of the metal plate 4 can be effectively prolonged.

Further, an adhesive layer is further arranged between two adjacent metal plates, the adhesive layer is made of metal, and stability between the two metal plates is improved.

Example 2

As shown in fig. 5, a plurality of groove structures are disposed on the upper surface of the shielding region 6, and the groove structures in this embodiment adopt a structure with no through holes, so that a part of the conductive paste can infiltrate into the groove structures during the scraping process, thereby increasing the resistance of the upper surface of the shielding region in an intangible way, and avoiding the situation that the upper surface of the shielding region 6 is too smooth, so that the conductive paste directly slides across the surface and does not fall into the blanking region 5. In addition, in the repeated scraping plate process, a part of the conductive paste in the groove structure can overflow and is scraped into the blanking areas 5, so that the conductive paste can be fully filled into the blanking areas, a conductive circuit with better shape is formed on the surface of the substrate, and the conductive stability of the solar cell is improved.

The resistance structure is arranged as a groove structure, the groove structure can form a grid, and the grid is in the shape of one or more of a circle, a rectangle, a diamond, a trapezoid, a triangle and a polygon.

Example 3

As shown in fig. 6, a plurality of groove structures are disposed on the upper surface of the shielding region 6, and in this embodiment, the groove structures adopt a structure of through holes, and the depth of the through holes is the same as the thickness of the first metal plate. In the scraping process, more parts of the conductive paste can infiltrate into the groove structure, so that the resistance of the upper surface of the shielding region is increased intangibly, and the upper surface of the shielding region 6 is prevented from being too smooth, so that the conductive paste directly slides across the surface and does not fall into the blanking region 5. In addition, in the repeated scraping plate process, a part of the conductive paste in the groove structure can overflow and is scraped into the blanking areas 5, so that the conductive paste can be fully filled into the blanking areas, a conductive circuit with better shape is formed on the surface of the substrate, and the conductive stability of the solar cell is improved.

Example 4

As shown in fig. 7, in this embodiment, the upper surface of the shielding area is set to be a microscopic wave-like undulating surface and/or a linear wire drawing and a circular wire drawing, so that the resistance of the movement of the scraper is increased, and the conductive paste falls into the blanking area better, and the final form of the conductive circuit is better.

Example 5

As shown in fig. 8, the orifice edge of the second blanking hole 52 is provided with a chamfer A7. Or the side wall of the second blanking hole 52 is set to be of a conical structure with a wide upper part and a narrow lower part, so that on one hand, the side wall is tightened, the resistance of the conductive paste in falling is increased, and on the other hand, the conductive paste enters the second blanking hole 52 through the first blanking hole 51, so that the residue at a step can be reduced, and the use of raw materials can be saved to a certain extent. The step has less residue, so that the cleaning frequency can be reduced, and the service life of the metal screen plate can be prolonged.

Example 6

As shown in fig. 9, the two ends of the shielding area between two adjacent blanking areas on the same layer are provided with chamfer angles B8, and by arranging the chamfer angles B8, the width of the two ends of the shielding area of the part is larger than that of the middle part, so that a certain transition effect is provided, the strength of the edge of the shielding area of the part is enhanced, the risk of fracture in the tightening process of the screen plate can be prevented, and the reliability and the service life of the screen plate are enhanced.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A metal screen printing plate convenient for blanking conductive paste, comprising: at least two-layer metal plate that the stromatolite set up metal plate department has seted up a plurality of blanking district and will the shielding district that blanking district separates, the blanking district includes two at least blanking holes of upper and lower floor's width inequality, and wherein the width in lower floor's blanking hole is not greater than the width in upper strata blanking hole, the upper surface that shields the district is provided with resistance structure.

2. A metal screen plate for facilitating blanking of conductive paste according to claim 1, wherein the resistance structure comprises a raised structure and/or a recessed structure.

3. The metal screen printing plate for facilitating blanking of conductive paste according to claim 2, wherein the depth of the groove structure is smaller than or equal to the thickness of the first metal screen cloth.

4. A metal screen plate for facilitating blanking of conductive paste according to claim 2 or 3, wherein the horizontal cross-sectional shape of the raised structures or the recessed structures is set to one or a combination of a plurality of circular, rectangular, diamond, trapezoid, triangle, polygon.

5. A metal screen plate for facilitating blanking of conductive paste according to claim 1, wherein the resistance structure is arranged as microscopic wave-like relief surfaces and/or linear and circular wiredrawing.

6. A metal screen plate for facilitating blanking of conductive paste according to claim 1, wherein the orifice edge of the blanking hole is provided with a chamfer a.

7. A metal screen plate for facilitating blanking of a conductive paste according to claim 1, wherein the width W1 of the blanking holes of the lowermost layer ranges from 5 micrometers to 95 micrometers.

8. A metal screen plate for facilitating blanking of a conductive paste according to claim 1, wherein the width W2 of the blanking hole of the uppermost layer ranges from 1 to 45 μm.

9. The metal screen plate convenient for blanking of the conductive paste according to claim 1, wherein an adhesive layer is further arranged between two adjacent metal plates.

10. A metal screen plate facilitating blanking of conductive paste according to claim 1, wherein chamfers B are provided at both ends of a shielding region between two adjacent blanking regions of the same layer.