Puncture-resistant steel plate and printing apparatus

Abstract

This invention provides a puncture-resistant steel plate for the production of solar cells. The puncture-resistant steel plate includes a first steel plate and a second steel plate stacked on the first steel plate. The first steel plate abuts against the solar cell. Printing channels are provided through the second steel plate. The second steel plate has a wear-resistant zone surrounding the printing channels. Vertically, the projection of the edge of the solar cell falls within the wear-resistant zone. A friction groove is formed on the side of the second steel plate opposite to the first steel plate, surrounding the printing channels and the wear-resistant zone. This invention, through its unique wear-resistant zone design, locally strengthens the friction path at the edge of the solar cell, significantly improving the friction resistance of the steel plate. This greatly enhances the puncture resistance of the steel plate at the corresponding position on the edge of the solar cell, effectively avoiding problems such as steel plate wear and paste leakage caused by long-term friction, and ensuring the continuity and stability of production.

Description

Technical Field

[0001] This utility model relates to the field of solar cell printing technology, and in particular to a puncture-resistant steel plate and printing equipment. Background Technology

[0002] In industries such as photovoltaics and electronic printing, screen printing technology is often used to precisely print paste onto solar cells to form circuit or electrode patterns. The printing screen is usually a two-layer structure, including a first layer 10 with pattern openings and a second layer 20 that provides support.

[0003] like Figure 1 and Figure 2 As shown, to improve the transfer efficiency and filling properties of the printing paste during the printing process, and to prevent the paste from slipping when the squeegee is dragged, existing technologies typically set dense micro-holes 40 on the entire surface of the stencil (including the graphic area and non-graphic area). These micro-holes 40 effectively increase the friction between the squeegee and the screen, ensuring that the paste is evenly and smoothly scraped into the graphic opening.

[0004] However, the aforementioned common design has a significant drawback: during long-term, high-speed continuous printing operations, the hard edges of the solar cell 30 will continuously rub against the screen surface. Since these microporous areas 40 are essentially hollowed-out areas of the screen material, their structural strength is weakened, typically consisting of only one layer of material. After hundreds of thousands of friction cycles, the edges of the solar cell 30 will gradually wear through the screen material in this area, causing the screen to break. Once the screen is worn through, the ink will leak from the break, contaminating the equipment and the product, leading to printing defects, and ultimately forcing the screen to be scrapped prematurely. This problem becomes increasingly prominent against the backdrop of customers demanding higher lifespans for printing equipment (such as 400,000 cycles or even higher).

[0005] In view of this, it is necessary to improve the existing steel plates to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a puncture-resistant steel plate to solve the problem that existing steel plates are easily worn through by the edges of battery cells.

[0007] To achieve the above objectives, this utility model provides a puncture-resistant steel plate for the production of battery cells. The puncture-resistant steel plate includes a first steel plate and a second steel plate stacked on the first steel plate. The first steel plate abuts against the battery cell. The second steel plate has a through-hole printing channel. The second steel plate has a wear-resistant area around the printing channel. In the vertical direction, the projection of the edge of the battery cell falls within the wear-resistant area. The side of the second steel plate opposite to the first steel plate is recessed to form a friction groove surrounding the printing channel and the wear-resistant area.

[0008] As a further improvement of this utility model, the friction groove is a grid groove.

[0009] As a further improvement of this utility model, the side length of the friction groove is 45 micrometers.

[0010] As a further improvement of this utility model, the friction grooves are arranged in an equidistant array.

[0011] As a further improvement of this utility model, the distance between two adjacent friction grooves is 60 micrometers to 120 micrometers.

[0012] As a further improvement of this utility model, the width of the wear-resistant zone along the direction perpendicular to the battery cell is greater than 150 micrometers.

[0013] As a further improvement of this utility model, the wear-resistant area has an inner edge located on the inner side of the battery cell in the horizontal direction and an outer edge located on the outer side of the battery cell. The distance between the inner edge and the edge of the battery cell in the horizontal direction is greater than 150 micrometers and less than 500 micrometers.

[0014] As a further improvement of this utility model, the distance between the outer edge and the edge of the battery cell in the horizontal direction is greater than 600 micrometers.

[0015] This utility model also provides a printing device, which includes the puncture-resistant steel plate as described above.

[0016] The beneficial effects of this utility model are as follows: The puncture-resistant steel plate and printing equipment of this utility model, through the original wear-resistant zone design, locally strengthen the friction path at the edge of the battery cell, thereby improving the wear resistance of the steel plate several times over. This significantly enhances the puncture resistance of the steel plate at the corresponding position at the edge of the battery cell, effectively avoiding problems such as steel plate wear and paste leakage caused by long-term friction, and ensuring the continuity and stability of production. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a cross-sectional schematic diagram of an existing steel plate in the background art; Figure 2 yes Figure 1 A magnified structural diagram of region A in the middle; Figure 3 This is a top view structural diagram of the puncture-resistant steel plate of this utility model; Figure 4 yes Figure 3 A magnified structural diagram of region B in the middle; Figure 5This is a cross-sectional schematic diagram of the puncture-resistant steel plate of this utility model; Figure 6 yes Figure 5 A magnified structural diagram of region C in the middle. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of 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.

[0020] In the description of this utility model, it should be noted that, 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 based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figures 3 to 6 As shown, the puncture-resistant steel plate 100 of this utility model is used in the production of battery cell 200. The puncture-resistant steel plate 100 includes a first steel plate 1 and a second steel plate 2 stacked on the first steel plate 1.

[0022] The first steel plate 1 abuts against the battery cell 200, and the second steel plate 2 is provided with printing channels 21. Correspondingly, a fine grid is formed on the first steel plate 1. The squeegee contacts the second steel plate 2, and the paste passes through the printing channels 21 and the fine grid to form a pattern on the battery cell 200. That is, in this embodiment, a preset circuit pattern is formed on the first steel plate 1, and the second steel plate 2 serves to increase the structural strength.

[0023] The second steel plate 2 has a wear-resistant area 3 around the printing channel 21. In the vertical direction, the projection of the edge of the battery cell 200 falls within the wear-resistant area 3. The side of the second steel plate 2 opposite to the first steel plate 1 is recessed to form a friction groove 22 around the printing channel 21 and the wear-resistant area 3.

[0024] The friction grooves 22 increase friction, preventing the ink from slipping and also preventing the squeegee from slipping. Having more friction grooves 22 improves printing quality, ensuring the squeegee can stably move the ink forward, filling it evenly and preventing the ink from falling uncontrollably and unevenly into the printing channel 21.

[0025] In this embodiment, the wear-resistant area 3 is located outside the graphic area formed by the printing channels 21 and has no effect on the printing friction. However, the wear-resistant area 3 is thicker above the first steel plate 1 that contacts the battery cell 200 because the friction groove 22 is not provided in the wear-resistant area 3. Therefore, the friction resistance of the edge of the battery cell 200 is improved several times. With the friction groove 22 and wear-resistant area 3 set in this way, the life of the puncture-resistant steel plate 100 can be increased by 2.5 to 3 times compared with the full coverage solution of the friction groove 22.

[0026] In this embodiment, the friction groove 22 is a square groove. In other embodiments, the friction groove 22 can also be a rectangular groove, a circular groove, a diamond groove, or a groove of other closed shapes, as long as it can increase the surface friction of the second steel plate 2, promote the rolling of the paste particles, and improve the printing effect. It can be adjusted according to specific process requirements, providing a wide range of design flexibility. Its core is to provide a friction-increasing effect rather than a specific shape.

[0027] In this embodiment, the side length of the friction groove 22 is 45 micrometers. During the experiment, a side length of 20-150 micrometers for the friction groove 22 consistently provided a good performance improvement. The friction groove 22 can be a through hole or a blind hole.

[0028] In this embodiment, the friction grooves 22 are arranged in an equidistant array. Specifically, the printing channels 21 are arranged in an array, and the friction grooves 22 can be arranged in an array around the printing channels 21. In this embodiment, the friction grooves 22 must at least cover the area with the printing channels 21, that is, friction grooves 22 must be provided throughout the blade stroke.

[0029] In this embodiment, the distance between two adjacent friction grooves 22 is 60 micrometers to 120 micrometers.

[0030] In this embodiment, the width of the wear-resistant area 3 along the direction perpendicular to the battery cell 200 is greater than 150 micrometers. The existing printing press has a self-alignment error of 75 micrometers, requiring the wear-resistant area 3 to be at least 150 micrometers wide along the direction perpendicular to the battery cell 200. This ensures that the alignment error is covered on both sides, guaranteeing that the projection of the edge of the battery cell 200 falls within the wear-resistant area 3. This ensures that even with fluctuations in equipment accuracy, the projection of the edge of the battery cell 200 will always fall within the wear-resistant area 3, guaranteeing the reliability and universality of the design.

[0031] In this embodiment, the wear-resistant area 3 has an inner edge located inside the battery cell 200 along the horizontal direction and an outer edge located outside the battery cell 200. The distance between the inner edge and the edge of the battery cell 200 along the horizontal direction is greater than 150 micrometers and less than 500 micrometers. If the distance between the inner edge and the edge of the battery cell 200 is too small, it may result in the inability to cover the self-alignment error of the printing machine, while if the distance between the inner edge and the edge of the battery cell 200 is too large, it may affect the function of the area with the printing channel 21.

[0032] Generally, there is no specific limitation on the distance between the outer edge and the edge of the battery cell 200. In this embodiment, the distance between the outer edge and the edge of the battery cell 200 in the horizontal direction is greater than 600 micrometers.

[0033] The printing equipment of this utility model includes a frame, an ink supply mechanism, a pad printing mechanism, and a puncture-resistant steel plate 100. The puncture-resistant steel plate 100 has high strength and is not easily worn by the edges of the battery cells 200, which makes the printing equipment have better printing effect and longer service life.

[0034] The puncture-resistant steel plate 100 and printing equipment of this utility model, through the original design of the wear-resistant zone 3, locally strengthen the friction path at the edge of the battery cell 200, thereby improving the wear resistance of the steel plate several times. This significantly enhances the puncture resistance of the steel plate at the corresponding position at the edge of the battery cell 200, effectively avoiding problems such as steel plate wear and paste leakage caused by long-term friction, and ensuring the continuity and stability of production.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the 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.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A puncture-resistant steel plate for use in the production of battery cells, characterized in that: The puncture-resistant steel plate includes a first steel plate and a second steel plate stacked on the first steel plate. The first steel plate abuts against the battery cell. The second steel plate has a through-printed channel. The second steel plate has a wear-resistant area around the printed channel. In the vertical direction, the projection of the edge of the battery cell falls within the wear-resistant area. The side of the second steel plate opposite to the first steel plate is recessed to form a friction groove surrounding the printed channel and the wear-resistant area.

2. The puncture-resistant steel plate according to claim 1, characterized in that: The friction groove is a grid groove.

3. The puncture-resistant steel plate according to claim 2, characterized in that: The side length of the friction groove is 45 micrometers.

4. The puncture-resistant steel plate according to claim 1, characterized in that: The friction grooves are arranged in an equidistant array.

5. The puncture-resistant steel plate according to claim 4, characterized in that: The distance between two adjacent friction grooves is 60 micrometers to 120 micrometers.

6. The puncture-resistant steel plate according to claim 1, characterized in that: The wear-resistant zone has a width of more than 150 micrometers along the direction perpendicular to the battery cell.

7. The puncture-resistant steel plate according to claim 1, characterized in that: The wear-resistant area has an inner edge located on the inside of the battery cell in the horizontal direction and an outer edge located on the outside of the battery cell. The distance between the inner edge and the edge of the battery cell in the horizontal direction is greater than 150 micrometers and less than 500 micrometers.

8. The puncture-resistant steel plate according to claim 7, characterized in that: The distance between the outer edge and the edge of the battery cell in the horizontal direction is greater than 600 micrometers.

9. A printing apparatus, characterized in that: The printing equipment includes a puncture-resistant steel plate as described in any one of claims 1-8.

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