CN209971826U - Rubber-coated screen plate - Google Patents

Abstract

The utility model discloses a glue brushing screen plate, which comprises a rectangular metal frame, a stretching net protection area and a metal mesh sheet; the metal frame is adaptive to the MWT photovoltaic module in shape, a metal mesh is arranged in the middle of the metal frame, and the metal mesh is connected to the metal frame through a stretching net protection area; the metal mesh is provided with holes, and the holes are designed at the positions of back electrode points of the MWT photovoltaic module according to use requirements. Through using the utility model discloses the method can promote the product yield, and reduce cost improves staff's operating efficiency, creates economic value for the enterprise.

Description

A brush screen

technical field

The utility model relates to an adhesive brushing screen plate for conductive adhesive, in particular to an adhesive brushing screen plate for MWT photovoltaic assembly conductive adhesive, which belongs to the technical field of MWT solar cell assembly processing.

Background technique

MWT photovoltaic module is a photovoltaic module based on a new metal foil circuit design. The cells are interconnected through conductive glue and conductive core board to form a complete conductive circuit. The MWT back-contact battery technology is that the front busbar is laser-drilled, the front electrode of the cell is introduced into the back of the cell, and the current on the front is concentrated to the back in combination with the perforated silver paste. The positive and negative electrodes on the back are distributed in dots, and the back The positive and negative electrode points are then connected to the conductive core board through conductive glue to form a conductive loop. Since the pore size of the electrode points on the back of the MWT cell is less than 200 microns, and the conductive adhesive is an adhesive that has both electrical conductivity and bonding properties, if the conductive adhesive is poorly printed, the electrode points of the cell will not correspond to the glue points, resulting in contact defective, resulting in product downgrade. Therefore, it is necessary to find a new method for printing conductive paste.

Utility model content

In order to solve the printing quality problem of the conductive adhesive of the MWT photovoltaic module, a printing method suitable for the MWT photovoltaic module is provided. By using this method, product yield can be improved, costs can be reduced, employee work efficiency can be improved, and economic value can be created for the enterprise.

In order to achieve the purpose of the above utility model, the utility model provides a glue brushed screen plate, the glue brush screen plate includes a rectangular metal frame, a stretched mesh protection area and a metal mesh sheet; wherein, the shape of the metal frame is the same as that of the MWT photovoltaic module. The metal mesh is in the middle, and the metal mesh is connected to the metal frame through the stretched mesh protection area; the metal mesh has holes, and the holes are designed at the position of the electrode points on the back of the MWT photovoltaic module according to the needs of use. .

Further, the cross-section of the holes of the metal mesh is trapezoidal, the upper part is small and the lower part is large, and the diameter of the larger side is 1.35+-0.05mm.

Further, the stretched net protection area is stretched with stainless steel wire, and the connection between the stretched net and the metal mesh and the stretched net and the metal frame is coated with protective glue.

As a preference, the metal frame is made of an aluminum alloy material, and the metal mesh is a steel mesh.

The utility model also provides a printing method for the conductive adhesive of the MWT photovoltaic module, the printing method comprising the following steps:

Step 1, open the screen clamp, put the glue screen plate into the fixing frame smoothly and push it to the limit stop; lock the glue screen plate; according to the image display, rotate the dial to adjust the position of the glue screen plate Align the hole with the electrode point position on the copper foil;

Step 2: Stir the thawed conductive glue evenly with a scraper, shovel out the conductive glue from the glue bucket, and evenly coat it on the screen printing area where the glue is brushed, that is, the head of the metal mesh. Less than the width of the screen printing area;

Step 3: Print the conductive glue on the copper foil by applying pressure with the help of a scraper; during printing, apply the conductive glue on both ends of the glue-brush screen, and use a scraper to apply the conductive glue on the glue-brush screen. At the same time, the conductive glue is pressed from the holes of the printing surface to the copper foil by the scraper during the movement.

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

1. High printing accuracy, small error, good printing quality and so on.

2. The screen plate has high rigidity and low elasticity, and can be used repeatedly to reduce cost and waste.

3. The printing aperture and hole spacing are uniform and accurate, and the printing efficiency is high, which is conducive to improving the working efficiency of employees.

Description of drawings

Fig. 1 is the plane schematic diagram of brushing glue screen;

Figure 2 is a sectional view of the opening of the steel mesh sheet;

FIG. 3 is a schematic diagram of the conductive adhesive printing process;

In the figure, 1- stencil printing area, 2- stretch mesh protection area, 3- aluminum alloy frame.

Detailed ways

Below, the technical content adopted in the present utility model is further explained in conjunction with the accompanying drawings:

Example 1

The utility model provides a glue-brush screen plate, the glue-brush screen plate includes a rectangular metal frame, a stretched mesh protection area 2 and a metal mesh sheet; wherein, the shape of the metal frame is adapted to the MWT photovoltaic module, and the middle is a metal frame Mesh, the metal mesh is connected to the metal frame through the stretched mesh protection area; the metal mesh has holes, and the holes are designed at the position of the electrode points on the back of the MWT photovoltaic module according to the needs of use. In this embodiment, the metal frame is made of an aluminum alloy material, and the metal mesh is a steel mesh.

Figure 1 shows a plan view of the screen. In Figure 1, the screen is surrounded by an aluminum alloy frame 3, which is placed to impact and squeeze to deform, pressurized and firm, and the stretch mesh protection area 2 is stretched by stainless steel wire.

Further, the cross-section of the holes of the metal mesh is trapezoidal, the upper part is small and the lower part is large, and the diameter of the larger side is 1.35+-0.05mm.

Figure 2 is a sectional view of the opening of the stencil sheet. Since the thickness of the stencil sheet is 0.3mm, in order to ensure that the shape of the printed conductive adhesive is a trapezoidal cylinder, it is necessary to apply the conductive adhesive from the printing surface to the squeegee surface through pressure printing. The aperture of the plate is 1.3mm, and the side of the scratch surface is the copper foil surface.

Further, the stretched net protection area is stretched with stainless steel wire, and the connection between the stretched net and the metal mesh and the stretched net and the metal frame is coated with protective glue. The stretched mesh, steel mesh sheet, and aluminum alloy frame 3 are not easy to be degummed. The coated protective glue can effectively ensure the firmness and tension of the screen during the printing process. The middle part is the effective printing area of the conductive glue, which is coated with conductive glue. In the printing area, a certain pressure is applied to print the conductive glue on the copper foil through a small aperture through the extrusion of the squeegee.

As a preference, the metal frame is made of an aluminum alloy material, and the metal mesh is a steel mesh.

The brushed screen is an electro-polished steel mesh. Through fine polishing, the smoothness of the inner wall is enhanced to facilitate degumming; the protective glue on the stretcher net ensures sufficient firmness and tension, and can be applied to standard printing quality requirements. The printing screen plate provided by the utility model has the characteristics of high printing precision, small error, good printing quality and the like; and the screen plate has high rigidity and small elasticity, can be used repeatedly, and reduces cost and waste.

Example 2

The utility model also provides a printing method for the conductive adhesive of the MWT photovoltaic module, the printing method comprising the following steps:

Step 1, open the screen clamp, put the glue screen plate into the fixing frame smoothly and push it to the limit stop; lock the glue brush screen plate; according to the image display, rotate the dial to fine-tune the screen plate position to make reference Align the hole with the cross mark on the software, align the hole with the electrode point position on the copper foil; put down the scraper;

Step 2: Stir the thawed conductive glue evenly with a scraper, shovel out the conductive glue from the glue bucket, and evenly coat it on the screen printing area where the glue is brushed, that is, the head of the metal mesh. Less than the width of the screen printing area;

Step 3: Print the conductive glue on the copper foil by applying pressure with the help of a scraper; during printing, apply the conductive glue on both ends of the glue-brush screen, and use a scraper to apply the conductive glue on the glue-brush screen. At the same time, the conductive glue is pressed from the holes of the printing surface to the copper foil by the scraper during the movement.

Figure 3 is a schematic diagram of the conductive adhesive printing process. In the figure, A is the conductive adhesive, B is the squeegee, C is the effective printing area mesh, D is the screen, E is the carrier, F is the dial, G is the limit stop, H For the screen fixture.

Printing principle: The screen plate is used as the plate base, and the conductive adhesive is printed on the copper foil by applying pressure with the help of a squeegee. When printing, apply conductive glue on both ends of the screen, apply a certain pressure to the conductive glue on the screen with a squeegee, and at the same time move to the other end of the screen at a constant speed to print back and forth. The mesh of the surface part is extruded onto the copper foil, and the glue dots correspond to the electrode dots.

The MWT photovoltaic module conductive adhesive printing method provided by the utility model can realize good contact between the positive and negative electrode points on the back of the cell and the adhesive brushing points, thereby forming a conductive loop.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements can be made without departing from the principles of the present invention, and these improvements should also be regarded as the present invention. The scope of protection of the utility model.

Claims (4)

1. A glue brushing screen is characterized by comprising a rectangular metal frame, a stretched net protection area and a metal mesh; the metal frame is adaptive to the MWT photovoltaic module in shape, a metal mesh is arranged in the middle of the metal frame, and the metal mesh is connected to the metal frame through a stretching net protection area; the metal mesh is provided with holes, and the holes are designed at the positions of back electrode points of the MWT photovoltaic module according to use requirements.

2. The screen printing plate of claim 1, wherein the cross section of the holes of the metal mesh is trapezoidal, the upper part is small, the lower part is large, and the diameter of the large side is 1.35+ -0.05 mm.

3. The glue-brushing screen printing plate as claimed in claim 2, wherein the screen stretching protection area is a stainless steel wire screen stretching area, and the joints between the screen stretching area and the metal mesh sheet and between the screen stretching area and the metal frame are coated with protection glue.

4. The screen printing plate of any one of claims 1 to 3, wherein the metal frame is made of an aluminum alloy material, and the metal mesh is a steel mesh.

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