A gap coating valve device and coating equipment

Abstract

The present application discloses a gap coating valve device and coating equipment, which relates to the field of coating technology, including a feed valve, a flow regulating mechanism and an intermediate pipe; the feed valve is provided with a first feed port and a first discharge port; the first discharge port is used to communicate with the feed end of the coating die; the intermediate pipe includes a first pipeline and a second pipeline that are interconnected; the first pipeline is connected to the first feed port; the flow regulating mechanism includes a piston chamber, an adjusting piston and an adjusting drive assembly; the piston chamber is connected to the second pipeline; the adjusting drive assembly is used to drive the adjusting piston to move in the piston chamber. The piston stroke is controlled by a program to compensate the flow of the coating head and tail sections, thereby controlling the head and tail thickness of the pole piece, and under the same working conditions, it can adapt to more coating process requirements.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to a gap coating valve device and coating equipment. Background Art

[0002] With the rapid development of new energy vehicles, the demand for lithium batteries is growing more and more rapidly, and the requirements for lithium batteries are getting higher and higher. In the field of lithium battery production, coating is the most critical link affecting battery performance. The quality of coating directly affects the capacity of the battery.

[0003] In coating processing, intermittent coating processing is often used. In the gap coating of the current lithium battery extrusion coating machine, the principle of adjusting the thickness of the head and tail of the pole piece is to use a program-driven cylinder or motor to control the feed valve and return valve in the gap coating valve device, and to control the head and tail flow rate by coordinating the opening and closing timing of these two valves to adjust the coating head and tail thickness. When the coating gap size is smaller and the head and tail thickness is thicker, the process debugging of the above-mentioned gap coating valve device becomes more and more difficult, especially when the tail needs to be thickened, it can no longer meet this kind of special gap coating process requirements. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a gap coating valve device and a coating equipment to solve the technical problem that the existing gap coating valve device cannot better meet the process requirements of a smaller coating gap.

[0005] In order to achieve the above technical purpose, the present application provides a gap coating valve device, including a feed valve, a flow regulating mechanism and an intermediate pipe;

[0006] The feed valve is provided with a first feed inlet and a first discharge outlet;

[0007] The first discharge port is used to communicate with the feed end of the coating die head;

[0008] The intermediate pipe includes a first pipe and a second pipe which are interconnected;

[0009] The first pipeline is in communication with the first feed inlet;

[0010] The flow regulating mechanism comprises a piston chamber, a regulating piston and a feed drive assembly;

[0011] The piston chamber is in communication with the second pipeline;

[0012] The feed drive assembly is used to drive the regulating piston to move in the piston chamber.

[0013] Furthermore, the intermediate pipe further comprises a third pipe interconnected with the first pipe and the second pipe;

[0014] The third pipeline is connected with a return valve;

[0015] The return valve is provided with a return port, a second feed port and a second discharge port;

[0016] The second feed port is connected with a feed pipe;

[0017] The second discharge port is in communication with the third pipeline;

[0018] The return port is connected with a return pipe.

[0019] Furthermore, a pressure regulating valve is installed on the return pipe.

[0020] Furthermore, the return valve is provided with a return valve core;

[0021] The material return valve core is connected to a material return drive assembly via a material return piston rod;

[0022] The return material driving assembly is used to drive the return material valve core to move so as to open or close the return material port.

[0023] Furthermore, the feed valve is provided with a feed valve core;

[0024] The feed valve core is connected to a feed drive assembly via a feed piston rod;

[0025] The feed drive assembly is used to drive the feed valve core to move so as to open or close the first discharge port.

[0026] Furthermore, the first discharge port is connected to the feed end of the coating die head through a discharge pipe.

[0027] Furthermore, the discharge pipe is a 90° elbow.

[0028] The present application also discloses a coating device, including the gap coating valve device.

[0029] From the above technical solutions, it can be seen that the gap coating valve device designed in this application controls the piston movement stroke through the feed drive assembly of the flow regulating mechanism to compensate the flow of the coating head and tail sections, thereby controlling the head and tail thickness of the electrode. Under the same working conditions, the gap coating valve device designed in this application is adapted to a larger gap size range and head and tail thickness range than the existing gap coating valve device, and can adapt to more coating process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 This is a schematic structural diagram of a gap coating valve device provided in this application;

[0032] Figure 2 A schematic diagram of the thickening of the head and tail of the pole piece provided in this application;

[0033] Figure 3 A schematic diagram of the thinning of the head and tail of the pole piece provided in this application;

[0034] In the figure: 01, return pipe; 02, pressure regulating valve; 03, return valve; 04, intermediate pipe; 05, discharge pipe; 06, coating die head; 07, feed pipe; 08, return valve core; 09, return piston rod; 10, return drive assembly; 11, adjusting piston; 12, adjusting drive assembly; 13, feed valve core; 14, feed valve; 15, feed piston rod; 16, feed drive assembly; 17, flow regulating mechanism. DETAILED DESCRIPTION

[0035] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection of the embodiments of the present application.

[0036] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0038] The embodiment of the present application discloses a gap coating valve device.

[0039] See also Figure 1 , an embodiment of a gap coating valve device provided in the embodiments of the present application includes:

[0040] It includes a feed valve 14 , a flow regulating mechanism 17 and an intermediate pipe 04 .

[0041] The feed valve 14 is provided with a first feed port and a first discharge port, and the first discharge port is used to communicate with the feed end of the coating die head 06. The feed valve 14 is a two-way valve structure. The coating die head 06 is connected to the first discharge port through the discharge pipe 05. The discharge pipe 05 can be a 90° elbow pipe, which is designed according to the position distribution between the coating die head 06 and the feed valve 14, and is not limited.

[0042] The intermediate pipe comprises a first pipe and a second pipe which are connected to each other, and the first pipe is connected to the first feed port.

[0043] The flow regulating mechanism 17 includes a piston chamber, an adjusting piston 11 and an adjusting drive assembly 12. The piston chamber is connected to the second pipeline. The adjusting drive assembly 12 is used to drive the adjusting piston 11 to move in the piston chamber. The adjusting drive assembly 12 can be a cylinder or other linear displacement drive assembly that can drive the adjusting piston 11 to move.

[0044] Specifically, the area of ​​the thickness change region at the head and tail of the pole piece can be calculated based on the movement time of the regulating piston 11, the coating process and the coating speed. The required thickness change is calculated based on the actual coating situation, slurry parameters and process requirements. The movement time and movement stroke of the regulating piston 11 are controlled by the program to compensate the flow of the intermediate pipe 04, thereby controlling the thickness change at the head and tail of the pole piece. Numerically, flow compensation = the cross-sectional area of ​​the pipe at the regulating piston 11 × the movement stroke of the regulating piston 11 = the area of ​​the thickness change region at the head and tail of the pole piece wet film × the thickness change, and the thickness of the pole piece at the head and tail is controlled based on the above principle. For example: the regulating drive assembly 12 controls the regulating piston to move in the direction of extending into the piston cavity for a preset time and stroke, so that the material in the piston cavity is squeezed, thereby instantly increasing the material pressure in the feed valve 14, and achieving thickening of the tail.

[0045] The flow regulating mechanism 17 designed in the present application can not only maintain the stability of the slurry flow, but also change the slurry flow at the head and tail sections within a millisecond time period to perform thickening / thinning of specified dimensions. Even in a small gap coating process, it can meet the customer's requirements for thickening / thinning of the head and tail sections of the coating process and has active controllable characteristics.

[0046] The present application controls the piston movement stroke through the feed drive assembly of the flow regulating mechanism to compensate the flow of the coating head and tail sections, thereby controlling the head and tail thickness of the electrode. Under the same working conditions, the gap coating valve device designed in the present application is adapted to a larger gap size range and head and tail thickness range than the existing gap coating valve device, and can adapt to more coating process requirements.

[0047] The above is the first embodiment of a gap coating valve device provided by the embodiment of the present application. The following is the second embodiment of a gap coating valve device provided by the embodiment of the present application. For details, please refer to Figures 1 to 3 .

[0048] Based on the solution of the above embodiment 1:

[0049] Furthermore, the intermediate pipe also includes a third pipe interconnected with the first pipe and the second pipe; the third pipe is connected to a return valve 03; the return valve 03 is provided with a return port, a second feed port and a second discharge port; the second feed port is connected to a feed pipe 07; the second discharge port is connected to the third pipe; the return port is connected to a return pipe 01. The return valve 03 can prevent the pressurized material from flowing back and improve the stability of flow regulation.

[0050] Moreover, the flow regulating mechanism 17 is arranged between the return valve 03 and the feed valve 14, so that it can respond more quickly to the switching action of the feed valve 14 and the return valve 03, and has a faster response speed in adjusting the coating of the head and tail sections, and can adapt to smaller coating gap process requirements.

[0051] Furthermore, a pressure regulating valve 02 is installed on the return pipe 01 to adjust the slurry pressure.

[0052] Furthermore, the design of the return valve 03 specifically includes a return main structure, a return valve core 08 and a return drive assembly 10 .

[0053] The return valve core 08 is connected to the return drive assembly 10 through the return piston rod 09, and the return drive assembly 10 is used to drive the return valve core 08 to move to open or close the return port. This design can refer to the existing piston three-way return valve 03 design or directly use it, and no further description is given.

[0054] Furthermore, the design of the feed valve 14 specifically includes a feed main structure, a feed valve core 13 and a feed drive assembly 16 .

[0055] The feed valve core 13 is connected to the feed drive assembly 16 via the feed piston rod 15, and the feed drive assembly 16 is used to drive the feed valve core 13 to move to open or close the first discharge port. The design can refer to the existing piston two-way feed valve 14 design or directly use it, and no further description is given.

[0056] The gap coating valve device designed in this application is as follows Figure 2 The process of craniocaudal thickening shown is:

[0057] Step 1, start coating, the return drive assembly 10 drives the return piston rod 09 to retract, and the return valve core 08 is closed; the feed drive assembly 16 drives the feed piston rod 15 to extend, and the feed valve core 13 is opened, and at the same time, the adjustment drive assembly 12 drives the adjustment piston 11 to extend quickly. The slurry moves along the direction of the feed pipe 07-return valve 03-intermediate pipe 04-feed valve 14-discharge pipe 05-coating die head 06 to achieve thickening of the coating head.

[0058] Step 2: After the head thickness H1 meets the standard, the coating of the head area X1 is completed, and the adjustment drive assembly 12 drives the adjustment piston 11 to slowly retract to ensure that the pole piece thickness h meets the standard.

[0059] Step 3: When coating to the tail process area, the adjusting drive assembly 12 drives the adjusting piston 11 to extend quickly to ensure that the tail thickness H2 meets the standard, and the coating is ended after the thickening of the tail area X2 is completed.

[0060] Step 4, finish coating, the return drive assembly 10 drives the return piston rod 09 to extend, and the return valve core 08 opens; the feed drive assembly 16 drives the feed piston rod 15 to retract, and the feed valve core 13 closes. After the slurry moves along the direction of the feed pipe 07-return valve 03-pressure regulating valve 02-return pipe 01, the regulating drive assembly 12 drives the regulating piston 11 to retract. After the coating gap L is completed, the coating is restarted.

[0061] Step 5: Repeat the above steps to achieve gap coating.

[0062] The gap coating valve device designed in this application is as follows Figure 3 The process of head and tail thinning shown is:

[0063] Step 1, start coating, the return drive assembly 10 drives the return piston rod 09 to retract, and the return valve core 08; the feed drive assembly 16 drives the feed piston rod 15 to extend, and the feed valve core 13 is opened, and the adjustment drive assembly 12 drives the adjustment piston 11 to retract quickly. The slurry moves along the feed pipe 07-return valve 03-intermediate pipe 04-feed valve 14-discharge pipe 05-coating die head 06 to achieve thinning of the coating head.

[0064] Step 2: After the head thickness H1 meets the standard, the coating of the head area X1 is completed, and the adjustment drive assembly 12 drives the adjustment piston 11 to slowly extend to ensure that the pole piece thickness h meets the standard.

[0065] Step 3: When coating to the tail process area, the adjusting drive assembly 12 drives the adjusting piston 11 to retract quickly to ensure that the tail thickness H2 meets the standard, and the coating is ended after the tail area X2 is thinned.

[0066] Step 4, finish coating, the return drive assembly 10 drives the return piston rod 09 to extend, and the return valve core 08 opens; the feed drive assembly 16 drives the feed piston rod 15 to retract, and the feed valve core 13 closes. After the slurry moves along the direction of the feed pipe 07-return valve 03-pressure regulating valve 02-return pipe 01, the regulating drive assembly 12 drives the regulating piston 11 to extend. After the coating gap L is completed, the coating is restarted.

[0067] Step 5: Repeat the above steps to achieve gap coating.

[0068] The present application also discloses a coating device, including the above-mentioned gap coating valve device.

[0069] The above is a detailed introduction to a gap coating valve device and coating equipment provided by the present application. For a person skilled in the art, according to the ideas of the embodiments of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A gap coating valve device, characterized in that: It comprises a feed valve (14), a flow regulating mechanism (17) and an intermediate pipe (04); The feed valve (14) is provided with a first feed port and a first discharge port; The first outlet is used to communicate with the feed end of the coating die head (06); The intermediate pipe includes a first pipe and a second pipe which are interconnected; The first pipeline is in communication with the first feed inlet; The flow regulating mechanism (17) comprises a piston chamber, a regulating piston (11) and a regulating drive assembly (12); The piston chamber is in communication with the second pipeline; The adjusting drive assembly (12) is used to drive the adjusting piston (11) to move in the piston chamber.

2. The gap coating valve device according to claim 1, characterized in that: The intermediate pipe further includes a third pipe interconnected with the first pipe and the second pipe; The third pipeline is connected to a return valve (03); The return valve (03) is provided with a return port, a second feed port and a second discharge port; The second feed port is connected to a feed pipe (07); The second discharge port is in communication with the third pipeline; The return port is connected to a return pipe (01).

3. The gap coating valve device according to claim 2, characterized in that: The return pipe (01) is provided with a pressure regulating valve (02).

4. The gap coating valve device according to claim 2, characterized in that: The return valve (03) is provided with a return valve core (08); The return valve core (08) is connected to a return drive assembly (10) via a return piston rod (09); The return material driving assembly (10) is used to drive the return material valve core (08) to move so as to open or close the return material opening.

5. The gap coating valve device according to claim 1, characterized in that: The feed valve (14) is provided with a feed valve core (13); The feed valve core (13) is connected to a feed drive assembly (16) via a feed piston rod (15); The feed drive assembly (16) is used to drive the feed valve core (13) to move, so as to open or close the first discharge port.

6. The gap coating valve device according to claim 1, characterized in that: The first discharge port is connected to the feed end of the coating die head (06) via a discharge pipe (05).

7. The gap coating valve device according to claim 6, characterized in that: The discharge pipe (05) is a 90° elbow.

8. A coating device, characterized in that A gap coating valve device comprising the gap coating valve device according to any one of claims 1 to 7.

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