A step-and-repeat screen printing apparatus for reducing silver paste unit consumption of back contact cells

Abstract

The utility model relates to printing screen technology field, concretely relates to a kind of ladder screen printing device of reducing back contact battery silver paste unit consumption, including printing screen, printing screen includes screen version body and connecting border, printing channel is provided on screen version body, the lower surface of both sides of printing channel is all provided with protective ridge, by adding protective ridge at printing channel, the support of printing area both sides to screen version body caused screen version opening deformation is reduced, so that the printing area can be fully contacted screen version surface, guarantee screen version flat printing, thereby reduce the silver paste unit consumption of screen printing, improve the accuracy of screen printing grid line.

Description

Technical Field

[0001] This utility model relates to the field of printing screen technology, specifically to a stepped screen printing device for reducing the silver paste consumption of back contact batteries. Background Technology

[0002] In the manufacturing process of back-contact batteries, silver paste, as a key conductive material, accounts for a very high proportion of the total battery cost, directly affecting the market competitiveness and industrialization process of back-contact batteries. Screen printing technology, as the core process for electrode preparation in back-contact batteries, is closely related to the printing quality and silver paste consumption. Currently, traditional screen printing equipment, when printing on back-contact batteries, suffers from inadequate structural design at the printing channel. When the screen contacts the battery surface and begins printing, the support structures on both sides of the printing area exert significant pressure on the screen, easily causing deformation of the screen opening.

[0003] This screen opening deformation prevents the printing area from fully and evenly contacting the screen surface, resulting in uneven silver paste distribution during printing. To ensure the conductivity of the electrodes, the amount of silver paste used often needs to be increased, which undoubtedly increases the silver paste consumption per unit. At the same time, screen opening deformation also affects the accuracy of the printed grid lines, causing problems such as grid line misalignment and uneven thickness. This not only reduces the photoelectric conversion efficiency of the battery but may also cause battery reliability issues. Utility Model Content

[0004] To address the aforementioned issues, this utility model provides a stepped screen printing device that reduces silver paste consumption per unit of back contact battery. By adding protective ridges at the printing channel, the screen opening deformation caused by the support of the screen on both sides of the printing area is reduced, allowing the area to be printed to fully contact the screen surface, ensuring flat printing, thereby reducing silver paste consumption per unit of screen printing and improving the accuracy of the screen printing grid lines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a stepped screen printing device for reducing silver paste consumption of back contact batteries, comprising a printing screen, the printing screen comprising a screen body and a connecting frame, the screen body being provided with a printing channel, and protective protrusions being provided on the large lower surfaces on both sides of the printing channel.

[0006] As a further improvement to the above technical solution:

[0007] The network version body includes a base layer and a support layer.

[0008] The base layer is made of metal, the support layer is made of polyester, and the protective protrusions are integrally formed with the base layer.

[0009] The cross-section of the protective protrusion is rectangular.

[0010] The connecting frame includes a substrate, and a slot is provided on the inner side wall of the substrate. An extension plate that cooperates with the slot is provided around the perimeter of the screen body.

[0011] The substrate has a guide groove inside that communicates with the slot, and the end of the extension plate has a guide protrusion that cooperates with the guide groove.

[0012] The width of the guide groove opening gradually increases outward from the end connected to the slot.

[0013] The outer end face of the substrate is provided with a connecting plate for connecting printing machinery. The connecting plate is L-shaped and a buffer pad is provided on the lower surface of the connecting plate.

[0014] The beneficial effects of this utility model embodiment are as follows: The stepped screen printing device for reducing silver paste consumption of back contact batteries includes a printing screen, which includes a screen body and a connecting frame. A printing channel is provided on the screen body, and protective protrusions are provided on the lower surfaces of both sides of the printing channel. By adding protective protrusions at the printing channel, the screen opening deformation caused by the support of the screen on both sides of the printing area is reduced, so that the area to be printed can fully contact the screen surface, ensuring flat printing of the screen, thereby reducing silver paste consumption of screen printing and improving the accuracy of screen printing grid lines. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the connecting frame structure in this utility model;

[0017] Figure 3 This is a schematic diagram of the printing channel structure in this utility model;

[0018] Figure 4 This is a cross-sectional view of the substrate in this utility model.

[0019] In the diagram: 1. Printing screen; 2. Screen body; 3. Connecting frame; 4. Printing channel; 5. Protective ridge; 6. Base layer; 7. Support layer; 8. Substrate; 9. Slot; 10. Extension plate; 11. Guide groove; 12. Guide ridge; 13. Connecting plate; 14. Buffer pad. Detailed Implementation

[0020] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] like Figure 1 As shown, the stepped screen printing apparatus for reducing silver paste consumption in back contact batteries according to this embodiment includes a printing screen 1, which includes a screen body 2 and a connecting frame 3, as shown. Figure 3 As shown, the screen printing body 2 has printing channels 4, and multiple printing channels 4 form a printing pattern. The lower surfaces on both sides of the printing channels 4 are provided with protective ridges 5. The lower end face of the protective ridges 5 extends to the bottom of the screen printing body 2. During printing, both protective ridges 5 are located in the battery cell printing area. The design of the protective ridges 5 can reduce the screen opening deformation caused by the support of the screen on both sides of the printing area, so that the area to be printed can fully contact the screen surface, ensuring flat printing of the screen, thereby reducing the silver paste consumption of screen printing and improving the accuracy of the screen printing grid lines.

[0022] like Figure 3 As shown, the screen printing body 2 includes a base layer 6 and a support layer 7. The base layer 6 is made of metal material with a thickness of 15-30μm, and the support layer 7 is made of polyester material. The protective ridge 5 is integrally formed with the base layer 6. The screen printing body 2 adopts a composite screen printing. During the manufacturing process, the protective ridge 5 is integrally formed with the base layer by growing layer by layer. Then, the support layer 7 and the base layer 6 are bonded together with glue.

[0023] like Figure 2 As shown, the cross-section of the protective ridge 5 is rectangular, the height of the protective ridge 5 is 1-10μm, and the width is 50-1000μm. The two opposite surfaces of the two protective ridges 5 are planes, forming a rectangular channel with the printing area on the battery surface, which can improve the accuracy of the screen printing grid lines.

[0024] like Figure 4 As shown, the connecting frame 3 includes a substrate 8, and a slot 9 is provided on the inner side wall of the substrate 8. An extension plate 10 that cooperates with the slot 9 is provided around the screen printing body 2. In this embodiment, the cross-section of the substrate 8 is rectangular, and there are four of them. Three of them are fixedly connected to form a U-shaped open screen frame. Then, the screen printing body 2 is inserted into the screen frame. Finally, the last substrate is used to seal the opening of the screen frame. The two ends of the substrate 8 used for sealing are fixed to the screen frame with bolts, and an alignment groove is opened on its side wall facing the screen printing body 2. A silicone pad is laid at the bottom of the alignment groove. During installation, the deformation of the silicone pad can compensate for the gap between the screen printing body 2 and the substrate. In addition, it can absorb the vibration generated when the squeegee contacts the screen printing body 2 during the printing process, further improving the printing accuracy.

[0025] The substrate 8 has a guide groove 11 that communicates with the slot 9 inside. The end of the extension plate 10 has a guide protrusion 12 that works with the guide groove 11. The opening width of the guide groove 11 gradually increases from the end connected to the slot 9 outwards, forming a C-shape. The slot 9 and guide groove 11 can improve the ease of installation of the screen printing body 2 and limit the position of the screen printing body 2 to avoid skewness that could lead to printing failure.

[0026] The outer end face of the substrate 8 is provided with a connecting plate 13 for connecting printing machinery. The connecting plate 13 is L-shaped, and the lower surface of the connecting plate 13 is provided with a buffer pad 14. The connecting plate 13 forms an upper-open cavity in the upper part of the substrate 8 for placing excess printing paste. The connecting plate 13 is connected to the external equipment by bolts. The buffer pad 14 can absorb vibration during the printing process and avoid the screen printing body 2 from tilting after hard friction with the equipment.

[0027] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0030] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A stepped screen printing apparatus for reducing silver paste consumption in back-contact batteries, comprising a printing screen (1), characterized in that: The printing screen (1) includes a screen body (2) and a connecting border (3). A printing channel (4) is provided on the screen body (2), and protective protrusions (5) are provided on the lower surfaces of both sides of the printing channel (4).

2. The stepped screen printing apparatus for reducing silver paste consumption of back contact batteries according to claim 1, characterized in that: The network body (2) includes a base layer (6) and a support layer (7).

3. The stepped screen printing apparatus for reducing silver paste consumption of back contact batteries according to claim 2, characterized in that: The base layer (6) is made of metal, the support layer (7) is made of polyester, and the protective protrusion (5) is integrally formed with the base layer (6).

4. The stepped screen printing apparatus for reducing silver paste consumption of back contact batteries according to claim 1, characterized in that: The cross-section of the protective protrusion (5) is rectangular.

5. The stepped screen printing apparatus for reducing silver paste consumption of back contact batteries according to any one of claims 1-4, characterized in that: The connecting frame (3) includes a base material (8), and a slot (9) is provided on the inner side wall of the base material (8). An extension plate (10) that cooperates with the slot (9) is provided around the screen body (2).

6. The stepped screen printing apparatus for reducing silver paste consumption of back contact batteries according to claim 5, characterized in that: The substrate (8) has a guide groove (11) that communicates with the slot (9) inside, and the end of the extension plate (10) has a guide protrusion (12) that cooperates with the guide groove (11).

7. The stepped screen printing apparatus for reducing silver paste consumption of back contact batteries according to claim 6, characterized in that: The opening width of the guide groove (11) gradually increases outward from the end connected to the slot (9).

8. The stepped screen printing apparatus for reducing silver paste consumption of back contact batteries according to claim 5, characterized in that: The outer end face of the substrate (8) is provided with a connecting plate (13) for connecting printing machinery. The connecting plate (13) is L-shaped, and a buffer pad (14) is provided on the lower surface of the connecting plate (13).

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