CN218257261U - A full opening screen - Google Patents

Abstract

The utility model relates to a full-opening screen plate, which comprises a screen used for tightening and fixing the screen frame, a printing plate arranged in the inner area of the screen and resistant to high temperature and not easy to deform, and a protective film arranged on the lower surface of the printing plate ; The printing plate and protective film are provided with printing openings according to the needs of printing graphics. The purpose of the utility model is to provide a full opening screen and its manufacturing method, which can realize the full opening design, improve the life of the screen, reduce the cost of the screen, and at the same time, the battery will not be damaged during the printing process.

Description

A full opening screen

technical field

The utility model relates to a full opening screen plate.

Background technique

In the production process of solar cells, it is necessary to use screen printing to make silver paste metal electrode grid lines. The method is to apply a certain pressure with a scraper to press the screen to squeeze the electrode paste, so that the electrode paste can pass through. Screen, printed onto the surface of the battery to form the electrodes.

In order to increase the sunlight-receiving area of the solar cell and reduce the series resistance of the electrodes, the thin grids are made with increasingly thinner lines and higher thicknesses. As shown in Figure 1, in the production process of the conventional steel screen, due to the reduction of the width of the fine grid, when the wire 00 of the screen is just in the fine grid, the wire will block a part of the fine grid, resulting in the printing. The height of the grid line is undulating, not uniform enough, and in severe cases, it will also cause the problem of grid blocking and grid breaking.

Contents of the invention

The purpose of the utility model is to provide a full opening screen, which can realize the full opening design, improve the life of the screen, reduce the cost of the screen, and at the same time, the battery will not be damaged during the printing process.

The purpose of this utility model is achieved through the following technical solutions:

A full-opening screen plate, which includes a screen used for tightening and fixing the screen frame, a printing plate disposed in the inner area of the screen and resistant to high temperature and not easily deformed, and a protective film disposed on the lower surface of the printing plate; The plate and the protective film are provided with printing openings according to the needs of printing graphics.

Compared with the prior art, the utility model has the advantages of:

(1) When printing the grid lines, 100% openings can be achieved, and higher aspect ratios and fuller grid lines can be obtained after printing, which is conducive to reducing the grid line occlusion area on the battery surface and reducing the grid line resistance of the battery. Improve battery efficiency;

(2) The printing life of the utility model is much longer than that of the stainless steel screen, and the cost is lower, so that the battery production cost can be greatly reduced;

(3) The screen plate is in direct contact with the battery, which is easy to damage the battery. By laying a protective film, the screen plate can be prevented from damaging the battery.

Description of drawings

Fig. 1 is a structural schematic diagram of a conventional steel mesh grid line area;

Fig. 2 is the preparation steps of the full opening screen plate of the utility model embodiment;

Fig. 3 provides a schematic cross-sectional view of a stainless steel sheet for step S1 in the preparation of the utility model;

Fig. 4 is the schematic cross-sectional view of forming a layer of plastic film on the lower surface of the stainless steel sheet in step S2 in the preparation of the utility model;

Fig. 5 is the structural schematic diagram of bonding and connecting the stainless steel sheet and the organic silk mesh cloth after S2 coating in step S3 in the preparation of the utility model;

Fig. 6 is the schematic diagram of the structure of the stainless steel sheet and the organic silk mesh cloth stretched by a predetermined tension and fixed on the screen frame after step S4 in the preparation of the utility model is bonded and connected by S3;

Fig. 7 is a cross-sectional schematic diagram of stretching and fixing the stainless steel sheet and the organic silk mesh cloth on the screen frame after the bonding connection of S3 in step S4 in the preparation of the utility model according to a predetermined tension force;

Fig. 8 is the structural representation of printing grid lines formed by laser cutting the stainless steel sheets behind S4 nets in step S5 in the preparation of the utility model;

Figure 9 is an enlarged view of the central area of the stainless steel sheet that forms the printed grid line pattern after laser cutting S4 sheets of nets in step S5 in the preparation of the present utility model;

Fig. 10 is a schematic cross-sectional view of an embodiment of bonding and connecting the stainless steel sheet and the organic wire mesh cloth covered by S2 in step S3 in the preparation of the utility model.

detailed description

A full-opening screen plate, which includes a screen used for tightening and fixing the screen frame, a printing plate disposed in the inner area of the screen and resistant to high temperature and not easily deformed, and a protective film disposed on the lower surface of the printing plate; The plate and the protective film are provided with printing openings according to the needs of printing graphics.

The thickness of the protective film is 3-15um.

The material of the protective film is polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene , polypropylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene.

The thickness of the screen is 20-60um, and the thickness of the printing plate is 5-20um.

The inner area of the screen is provided with a hollow part matched with the printing plate.

The inner edge of the screen overlaps and adheres to the outer edge of the printing plate; the width of the overlapped area is 5-20mm.

The screen is an organic screen cloth, the printing plate is a stainless steel sheet, and the protective film is a plastic film.

A kind of manufacture method of full opening screen, it comprises the following steps,

A. Make a protective film on the lower surface of the cleaned printing plate;

B. Fix the printing plate with the screen;

C. Tighten and fix the screen and frame;

D. Hollow out the printing plate and protective film according to the printing pattern to form printing openings.

Cleaning the printing plate before performing step A, specifically cleaning the printing plate by using atmospheric plasma, after cleaning, the water contact angle on the surface of the printing plate is less than 30°.

The specific method of the step A is to paste a protective film on the lower surface of the printing plate, or to coat a layer of protective solution on the lower surface of the printing plate and form a protective film after curing.

The specific method of the step B is to bond and fix the printing plate and the screen. In one solution, the specific method of step B is to hollow out the inner area of the screen, and overlap and overlap the outer edge of the printing plate with the inner edge of the screen for adhesion, and the width of the overlapping area is 5-20mm.

The specific method of the step D is to carry out laser cutting on the printing plate and the protective film according to the printing pattern to hollow out and form the printing opening.

Below in conjunction with description accompanying drawing and embodiment the utility model content is described in detail:

As shown in Figure 2, a kind of preparation method of solar cell full aperture screen, its preparation steps are as follows:

S1, provide stainless steel sheet 30;

S2, forming a layer of plastic film 40 on the lower surface of the stainless steel sheet 30;

S3, the stainless steel sheet 30 that forms the plastic film 40 on the lower surface and the organic silk mesh cloth 20 are bonded and connected;

S4. Stretching the net: stretching the net cloth 20 after S3 according to a predetermined tension and fixing it on the net frame 10;

S5. Laser forming grid lines: cutting the stainless steel sheet 30 and the plastic film 40 by laser to form the printed grid lines 301 .

Example 1, as shown in Figure 3-9:

As shown in FIG. 3 , a stainless steel sheet 30 is provided in step S1 , the thickness of the stainless steel sheet 30 is 10 um, and the water contact angle on the surface of the stainless steel sheet 10 is less than 30° after the stainless steel sheet 30 is cleaned by atmospheric plasma.

As shown in FIG. 4 , in step S2 , a layer of plastic film 40 with glue is pasted on the lower surface of the stainless steel sheet 30 , the thickness of the glue in the glued PET is 3 um, and the thickness of PET is 5 um.

As shown in FIG. 5 , in step S3 , the stainless steel sheet 30 with the plastic film 40 formed on the lower surface is bonded to the organic screen cloth 20 . In a preferred solution, as shown in Figure 10, the organic silk mesh cloth 20 internal areas are hollowed out, and the outer edge of the stainless steel sheet 30 overlaps and overlaps the inner edge of the organic silk mesh cloth 20. The width of the overlapping overlapping region is 5- 20mm.

As shown in Figure 6-7, in step S4, the mesh cloth 20 after S3 is stretched according to a predetermined tension and fixed on the screen frame 10, and the predetermined tension is between 10-30N, where Figure 6 is after step S4 Schematic diagram of the structure, Figure 7 is a cross-sectional view after step S4.

As shown in FIG. 8 , it is a structural schematic diagram of forming printed grid lines 301 by laser cutting stainless steel sheet 30 and plastic film 40 in step S5,

As shown in FIG. 9 , which is a partially enlarged view of the area where the printed grid lines 301 are formed, the length W1 of the printed grid lines 301 is 10-20mm, and the width W2 is 10-30um.

Example 2:

The difference between this embodiment and Embodiment 1 is that: in step S2, the plastic film 40 on the lower surface of the stainless steel sheet 30 is formed by thermal curing after coating a layer of polyimide solution, and the thickness of the coated polyimide solution is 10 -20um, formed by continuous curing at 100°C-20M, 160°C-20M, 220°C-20M, 250°C-20M, 280°C-20M, and the thickness of the polyimide film formed after curing is 2-8um.

The utility model adopts the above technical scheme, and mainly has the following beneficial effects: ①The printing area of the grid line realizes 100% opening, and a higher aspect ratio and a fuller grid line can be obtained after printing, thereby helping to reduce the grid line on the surface of the battery Cover the area, reduce the resistance of the battery grid line, and then improve the battery efficiency; ②The printing life of the stainless steel sheet is much longer than that of the stainless steel screen, and the cost of the stainless steel sheet is lower than that of the stainless steel screen, which can greatly reduce the battery production cost; ③ The stainless steel is in direct contact with the battery, which is easy to damage the battery. By laying a plastic film on the lower surface of the stainless steel sheet, the stainless steel sheet will not damage the battery.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. A full-opening screen, characterized in that: it includes a screen that is used to tighten and fix the screen frame, a printing plate that is located in the inner area of the screen and is resistant to high temperature and is not easily deformed, and a printing plate that is arranged on the lower surface of the printing plate. Protective film; the printing plate and the protective film are provided with printing openings according to the needs of printing graphics. 2. The full opening screen according to claim 1, characterized in that: the thickness of the protective film is 3-15um. 3. The full opening screen according to claim 1, characterized in that: the material of the protective film is polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate Alcohol ester, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, poly One of vinylidene fluoride and polytetrafluoroethylene. 4. The full opening screen according to claim 1, characterized in that: the thickness of the screen is 20-60um, and the thickness of the printing plate is 5-20um. 5. The full opening screen according to claim 1, characterized in that: the inner area of the screen is provided with a hollow part matching with the printing plate. 6 . The full opening screen according to claim 5 , characterized in that: the inner edge of the screen overlaps and adheres to the outer edge of the printing plate; the width of the overlapped area is 5-20 mm. 7. The full opening screen according to any one of claims 1-6, characterized in that: the screen is an organic screen cloth, and the printing plate is a stainless steel sheet.

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