A dual-return back pressure device

Abstract

This utility model discloses a dual-backflow device, including a coating valve, a first backflow valve, a second backflow valve, a feed pipe, and a backflow pipe. The feed pipe, the second backflow valve, the first backflow valve, and the coating valve are connected in series. The feed pipe is connected to a feeding mechanism, and the coating valve is connected to a coating die. The first and second backflow valves are connected to a backflow mechanism via the backflow pipe. A first backflow valve is connected to one side of the first backflow valve, and a second backflow valve is connected to one side of the second backflow valve. The first backflow valve is used to adjust the backflow pressure of the first backflow valve, and the second backflow valve is used to adjust the backflow pressure of the second backflow valve. This utility model can achieve segmented control of the coating thickness at the beginning and end, ensuring uniform coating thickness of the electrode sheet, improving the consistency of electrode sheet compaction density, and improving battery cycle life and safety performance.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery coating equipment, specifically to a dual reflux back pressure device. Background Technology

[0002] With increasing user demands, lithium-ion batteries have been widely used in all aspects of life, leading to not only higher performance requirements but also lower manufacturing costs. Depending on the specific needs, electrode sheets may require dual-gap coating, while some areas may not require coating. Currently, when performing dual-gap irregular-shaped coating on electrode sheets, a shaped die is used instead of adhesive application and a double-layer die, thereby reducing manufacturing costs.

[0003] However, dual-gap irregular coating has two gap ends, resulting in a significant difference in the thickness of the tab ends compared to the normal area. Existing dual-gap coating processes use a coating valve and a return valve for control, allowing control only of the thickness at one gap end, and cannot simultaneously control the thickness of both the gap and tab ends using a single back pressure valve. Because closing the coating valve generates high pressure, this pressure affects the coating process during repeated opening and closing. Due to hydraulic instability, it's difficult to ensure the integrity of the coating surface during the second gap coating process, leading to missed or over-coating, affecting product precision control. With the increase in lithium battery capacity and density, and the increase in the number of cell layers, uneven electrode thickness and thickness differences in the middle area of ​​the cell result in inconsistent electrode compaction density, affecting battery cycle life and safety performance. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, this utility model provides a dual back pressure device that can achieve segmented control of the coating thickness at the beginning and end, ensure uniform coating thickness of the electrode sheet, improve the consistency of electrode sheet compaction density, and improve battery cycle life and safety performance.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A dual-backflow backpressure device includes a coating valve, a first backflow valve, a second backflow valve, a feed pipe, and a backflow pipe. The feed pipe, the second backflow valve, the first backflow valve, and the coating valve are connected in series. The feed pipe is connected to a feeding mechanism, and the coating valve is connected to a coating die. The first backflow valve and the second backflow valve are connected to a backflow mechanism through the backflow pipe. A first backpressure valve is connected to one side of the first backflow valve, and a second backpressure valve is connected to one side of the second backflow valve. The first backpressure valve is used to adjust the backflow pressure of the first backflow valve, and the second backpressure valve is used to adjust the backflow pressure of the second backflow valve.

[0007] As a further improvement to the above technical solution, the first back pressure valve is disposed between the first return valve and the return pipe, and the second back pressure valve is disposed between the second return valve and the return pipe.

[0008] As a further improvement to the above technical solution, the return pipe is a Y-shaped tee structure, with the first back pressure valve and the second back pressure valve connected to its two ends respectively, and the middle part of the return pipe connected to the return mechanism.

[0009] As a further improvement to the above technical solution, the coating valve has a first inlet and a first outlet, the first reflux valve has a second inlet, a second outlet and a first reflux port, the second reflux valve has a third inlet, a third outlet and a second reflux port, the feed pipe is connected to the third inlet, the third outlet is connected to the second inlet, the second outlet is connected to the first inlet, the first outlet is connected to the coating die head, the first reflux port is connected to the first back pressure valve, and the second reflux port is connected to the second back pressure valve.

[0010] As a further improvement to the above technical solution, the diameter of the third discharge port is larger than the diameter of the second inlet port, and the third discharge port and the second inlet port are connected by a frustum-shaped tube.

[0011] As a further improvement to the above technical solution, the coating valve includes a first valve body, a first valve core, and a first driving member. The first valve body is provided with a first valve cavity. One end of the first valve cavity is connected to the first feed port, and the other end of the first valve cavity is connected to the first discharge port. The first driving member is used to drive the first valve core to block or open the first discharge port.

[0012] As a further improvement to the above technical solution, the first reflux valve includes a second valve body, a second valve core, and a second driving component. The second valve body is provided with a second valve cavity, which is a T-shaped channel. The two ends of the second valve cavity are respectively connected to the second feed port and the second discharge port. The top end of the second valve cavity is connected to the first reflux port. The second driving component is used to drive the second valve core to block or open the first reflux port.

[0013] As a further improvement to the above technical solution, the second reflux valve includes a third valve body, a third valve core, and a third driving component. The third valve body is provided with a third valve cavity, which is a T-shaped channel. The two ends of the third valve cavity are respectively connected to the third feed port and the third discharge port. The top end of the third valve cavity is connected to the second reflux port. The third driving component is used to drive the third valve core to block or open the second reflux port.

[0014] As a further improvement to the above technical solution, the coating valve, the first reflux valve and the second reflux valve are all fixedly connected by clamps, and a sealing gasket is provided between the coating valve, the first reflux valve and the second reflux valve.

[0015] As a further improvement to the above technical solution, both the first back pressure valve and the second back pressure valve are electric back pressure valves.

[0016] The beneficial effects of this utility model are as follows: This utility model provides a dual back pressure device. By setting a first back pressure valve, a first back pressure valve, a second back pressure valve, and a second back pressure valve, the first back pressure valve can independently adjust the back pressure of the first back pressure valve to accurately control the thickness of the first gap at the beginning and end. The second back pressure valve can independently adjust the back pressure of the second back pressure valve to accurately control the thickness of the second gap at the beginning and end. Thus, it is possible to achieve segmented control of the coating thickness at the beginning and end, ensure uniform coating thickness of the electrode sheet, improve the consistency of electrode sheet compaction density, and improve battery cycle life and safety performance. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a structural schematic diagram provided by an example of this utility model;

[0019] Figure 2 yes Figure 1 Another structural diagram from another perspective;

[0020] Figure 3 yes Figure 1 Top view;

[0021] Figure 4 yes Figure 1 A sectional view.

[0022] Reference numerals: 100-Coating valve, 110-First inlet, 120-First outlet, 130-First valve body, 140-First valve core, 150-First drive element, 160-First valve chamber, 200-First reflux valve, 210-Second inlet, 220-Second outlet, 230-First reflux port, 240-Second valve body, 250-Second valve core, 260-Second drive element, 2 70-Second valve chamber, 300-Second reflux valve, 310-Third feed port, 320-Third discharge port, 330-Second reflux port, 340-Third valve body, 350-Third valve core, 360-Third drive component, 370-Third valve chamber, 400-Reflux pipe, 500-First back pressure valve, 600-Second back pressure valve, 700-Clamp, 800-Sealing gasket, 900-Frustoconical tube. Detailed Implementation

[0023] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0024] Reference Figures 1 to 4 This utility model provides a dual backflow pressure device, including a coating valve 100, a first backflow valve 200, a second backflow valve 300, a feed pipe (not shown in the figure), and a backflow pipe 400. The feed pipe, the second backflow valve 300, the first backflow valve 200, and the coating valve 100 are connected in series. The feed pipe is connected to a feeding mechanism, and the coating valve 100 is connected to a coating die (not shown in the figure). The first backflow valve 200 and the second backflow valve 300 are connected to a backflow mechanism (not shown in the figure) through the backflow pipe 400. The backflow mechanism can be a pipe connected to the coating die. A first back pressure valve 500 is connected to one side of the first backflow valve 200, and a second back pressure valve 600 is connected to one side of the second backflow valve 300. The first back pressure valve 500 is used to adjust the backflow pressure of the first backflow valve 200, and the second back pressure valve 600 is used to adjust the backflow pressure of the second backflow valve 300.

[0025] During the first stage of coating, coating valve 100 is opened, and first reflux valve 200 and second reflux valve 300 are closed. The coating liquid flows sequentially from the feed pipe into second reflux valve 300, first reflux valve 200 and coating valve 100, and enters coating die head through coating valve 100. The coating die head coats the electrode. During the first gap stage, coating valve 100 and second reflux valve 300 are closed, and first reflux valve 200 is opened. The coating liquid in the feed pipe flows back to reflux pipe 400 through first reflux valve 200. At the same time, first back pressure valve 500 adjusts the reflux pressure of first reflux valve 200, thereby enabling precise control of the thickness at the beginning and end of the first gap stage. During the second coating stage, coating valve 100 is opened, and first reflux valve 200 and second reflux valve 300 are closed. The coating liquid flows sequentially from the feed pipe into second reflux valve 300, first reflux valve 200 and coating valve 100, and enters coating die head through coating valve 100. Coating die head coats the electrode. During the second gap stage, coating valve 100 and first reflux valve 200 are closed, and second reflux valve 300 is opened. The coating liquid in the feed pipe flows back to reflux pipe 400 through second reflux valve 300. At the same time, second back pressure valve 600 adjusts the reflux pressure of second reflux valve 300, thereby enabling precise control of the thickness at the beginning and end of the second gap stage.

[0026] Therefore, the present invention can achieve segmented control of coating thickness at the beginning and end, ensure uniform coating thickness of the electrode sheet, improve the consistency of electrode sheet compaction density, and improve battery cycle life and safety performance.

[0027] In some preferred embodiments, a first back pressure valve 500 is disposed between a first return valve 200 and a return pipe 400, and a second back pressure valve 600 is disposed between a second return valve 300 and a return pipe 400. The coating liquid from the first return valve 200 first flows through the first back pressure valve 500 and then into the return pipe 400, and the coating liquid from the second return valve 300 first flows through the second back pressure valve 600 and then into the return pipe 400. On the one hand, the first back pressure valve 500 and the second back pressure valve 600 can independently adjust the return pressure, which can offset the pressure fluctuations caused by the opening and closing of the first return valve 200 or the second return valve 300. On the other hand, the first back pressure valve 500 and the second back pressure valve 600 can prevent the coating liquid from flowing backward, which can avoid the backflow of coating liquid caused by the failure of the return valve seal, and ensure coating accuracy.

[0028] In some preferred embodiments, the return pipe 400 has a Y-shaped tee structure, with the two ends of the return pipe 400 connected to the first back pressure valve 500 and the second back pressure valve 600, respectively, and the middle part of the return pipe 400 connected to the return mechanism, thereby reducing the arrangement of pipes and saving space.

[0029] In some preferred embodiments, the coating valve 100 has a first inlet 110 and a first outlet 120, the first reflux valve 200 has a second inlet 210, a second outlet 220 and a first reflux port 230, the second reflux valve 300 has a third inlet 310, a third outlet 320 and a second reflux port 330, the feed pipe is connected to the third inlet 310, the third outlet 320 is connected to the second inlet 210, the second outlet 220 is connected to the first inlet 110, the first outlet 120 is connected to the coating die head, the first reflux port 230 is connected to the first back pressure valve 500, and the second reflux port 330 is connected to the second back pressure valve 600.

[0030] Furthermore, the diameter of the third outlet 320 is larger than the diameter of the second inlet 210. The third outlet 320 and the second inlet 210 are connected by a frustum-shaped tube 900. The large-diameter design of the second reflux valve 300 can reduce the pumping resistance of the coating liquid, and the tapering design of the frustum-shaped tube 900 can achieve a smooth transition of the tube diameter, avoiding turbulence and eddies caused by abrupt changes in cross-section.

[0031] In some preferred embodiments, the coating valve 100 includes a first valve body 130, a first valve core 140, and a first drive member 150. The first valve body 130 is provided with a first valve cavity 160. One end of the first valve cavity 160 is connected to a first feed port 110, and the other end of the first valve cavity 160 is connected to a first discharge port 120. The first drive member 150 is used to drive the first valve core 140 to block or open the first discharge port 120, thereby enabling the coating valve 100 to open and close quickly.

[0032] Furthermore, the first reflux valve 200 includes a second valve body 240, a second valve core 250, and a second driving member 260. The second valve body 240 is provided with a second valve cavity 270, which is a T-shaped channel. The two ends of the second valve cavity 270 are respectively connected to the second feed port 210 and the second discharge port 220. The top end of the second valve cavity 270 is connected to the first reflux port 230. The second driving member 260 is used to drive the second valve core 250 to block or open the first reflux port 230, thereby enabling the rapid opening and closing of the first reflux valve 200.

[0033] Furthermore, the second reflux valve 300 includes a third valve body 340, a third valve core 350, and a third drive component 360. The third valve body 340 is provided with a third valve cavity 370, which is a T-shaped channel. The two ends of the third valve cavity 370 are respectively connected to the third feed port 310 and the third discharge port 320. The top end of the third valve cavity 370 is connected to the second reflux port 330. The third drive component 360 is used to drive the third valve core 350 to block or open the second reflux port 330, thereby enabling the second reflux valve 300 to open and close quickly.

[0034] In some preferred embodiments, the coating valve 100, the first return valve 200, and the second return valve 300 are all fixedly connected by clamps 700. On the one hand, this ensures a firm connection between the valve bodies, and on the other hand, it facilitates quick disassembly and assembly of the valve bodies, improving the convenience of maintenance.

[0035] Furthermore, sealing gaskets 800 are provided between the coating valve 100, the first return valve 200, and the second return valve 300, thereby improving the sealing performance, preventing leakage of the coating liquid, and ensuring pressure balance in the pipeline.

[0036] In some preferred embodiments, both the first back pressure valve 500 and the second back pressure valve 600 are electric back pressure valves. Electric back pressure valves can achieve automatic adjustment, enabling more precise pressure and flow regulation. Moreover, they eliminate the need for frequent manual adjustment of valve opening, reducing manual intervention and improving production efficiency.

[0037] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A dual-reflux back pressure device, characterized in that, The device includes a coating valve, a first reflux valve, a second reflux valve, a feed pipe, and a reflux pipe. The feed pipe, the second reflux valve, the first reflux valve, and the coating valve are connected in series. The feed pipe is connected to a feeding mechanism, and the coating valve is connected to a coating die. The first reflux valve and the second reflux valve are connected to a reflux mechanism through the reflux pipe. A first back pressure valve is connected to one side of the first reflux valve, and a second back pressure valve is connected to one side of the second reflux valve. The first back pressure valve is used to adjust the reflux pressure of the first reflux valve, and the second back pressure valve is used to adjust the reflux pressure of the second reflux valve.

2. The dual-return back pressure device according to claim 1, characterized in that, The first back pressure valve is disposed between the first return valve and the return pipe, and the second back pressure valve is disposed between the second return valve and the return pipe.

3. The dual reflux back pressure device according to claim 2, characterized in that, The return pipe has a Y-shaped tee structure, with the first back pressure valve and the second back pressure valve connected to its two ends respectively, and the middle part of the return pipe connected to the return mechanism.

4. A dual-return back pressure device according to claim 2 or 3, characterized in that, The coating valve has a first inlet and a first outlet; the first reflux valve has a second inlet, a second outlet, and a first reflux port; the second reflux valve has a third inlet, a third outlet, and a second reflux port; the feed pipe is connected to the third inlet; the third outlet is connected to the second inlet; the second outlet is connected to the first inlet; the first outlet is connected to the coating die head; the first reflux port is connected to the first back pressure valve; and the second reflux port is connected to the second back pressure valve.

5. A dual-return back pressure device according to claim 4, characterized in that, The diameter of the third discharge port is larger than the diameter of the second inlet port, and the third discharge port and the second inlet port are connected by a frustum-shaped tube.

6. A dual-return back pressure device according to claim 4, characterized in that, The coating valve includes a first valve body, a first valve core, and a first driving component. The first valve body has a first valve cavity. One end of the first valve cavity is connected to the first feed port, and the other end of the first valve cavity is connected to the first discharge port. The first driving component is used to drive the first valve core to block or open the first discharge port.

7. A dual-return back pressure device according to claim 4, characterized in that, The first reflux valve includes a second valve body, a second valve core, and a second driving component. The second valve body is provided with a second valve cavity, which is a T-shaped channel. The two ends of the second valve cavity are respectively connected to the second feed port and the second discharge port. The top end of the second valve cavity is connected to the first reflux port. The second driving component is used to drive the second valve core to block or open the first reflux port.

8. A dual-return back pressure device according to claim 4, characterized in that, The second reflux valve includes a third valve body, a third valve core, and a third driving component. The third valve body is provided with a third valve cavity, which is a T-shaped channel. The two ends of the third valve cavity are respectively connected to the third feed port and the third discharge port. The top end of the third valve cavity is connected to the second reflux port. The third driving component is used to drive the third valve core to block or open the second reflux port.

9. A dual-return back pressure device according to claim 1, characterized in that, The coating valve, the first reflux valve, and the second reflux valve are all fixedly connected by clamps, and a sealing gasket is provided between the coating valve, the first reflux valve, and the second reflux valve.

10. A dual-return back pressure device according to claim 1, characterized in that, Both the first back pressure valve and the second back pressure valve are electric back pressure valves.

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