Coating extrusion head and coating device

Abstract

The utility model discloses a coating extrusion head and a coating device. The coating extrusion head comprises an extrusion head body. A first containing cavity used for containing first coating slurry is formed in the extrusion head body. The extrusion head body is provided with a first liquid inlet hole and a first liquid outlet hole which are communicated with the first containing cavity. When the first containing cavity needs to be cleaned, cleaning liquid can be injected into the first containing cavity through the first liquid inlet hole, and the cleaning liquid flowing out of the first containing cavity is collected through the first liquid outlet hole. And therefore, the extrusion head body does not need to be disassembled and assembled when the first accommodating cavity is cleaned. And therefore, the time required for cleaning the first accommodating cavity is shortened, and the downtime of the coating extrusion head is shortened.

Description

Technical Field

[0001] The present application relates to the field of battery substrate coating, and more specifically, to a coating extrusion head and a coating device. Background Art

[0002] Coating is an essential process in the battery production process, and is mainly used in the production of battery pole pieces. Coating in pole piece production refers to the process of coating the prepared paste-like viscous slurry evenly, continuously or intermittently on the pole piece.

[0003] During the electrode coating process, in addition to the thickness uniformity of the electrode coating position, reducing the downtime caused by cleaning the coating extrusion head is also an issue that needs to be considered. Utility Model Content

[0004] In view of the above problems, the embodiments of the present application provide a coating extrusion head and a coating device, which can reduce the downtime caused by cleaning the coating extrusion head.

[0005] In a first aspect, an embodiment of the present application provides a coating extrusion head including an extrusion head body. A first accommodating cavity for accommodating a first coating slurry is provided inside the extrusion head body. A first liquid inlet and a first liquid outlet connected to the first accommodating cavity are provided on the extrusion head body. The first liquid inlet is used for supplying a cleaning liquid into the first accommodating cavity, and the first liquid outlet is used for supplying a cleaning liquid out of the first accommodating cavity.

[0006] In the technical solution of the embodiment of the present application, the extrusion head body is provided with a first liquid inlet hole and a first liquid outlet hole which are connected with the first accommodating chamber. Therefore, when the first accommodating chamber needs to be cleaned, the cleaning liquid can be injected into the first accommodating chamber through the first liquid inlet hole, and the cleaning liquid flowing out of the first accommodating chamber can be collected through the first liquid outlet hole. Therefore, when cleaning the first accommodating chamber, there is no need to disassemble and assemble the extrusion head body. Therefore, the time required for cleaning the first accommodating chamber is reduced, thereby reducing the downtime of the coating extrusion head.

[0007] In some embodiments, the first liquid inlet and the first liquid outlet are respectively located at two ends of the first accommodating cavity in the length direction of the extrusion head body.

[0008] In the above technical solution, the first liquid inlet and the first liquid outlet are respectively located at the two ends of the first accommodating chamber in the length direction of the extrusion head body. In this way, after the cleaning liquid enters the first accommodating chamber from the first liquid inlet, it will flow from one end of the first accommodating chamber to the other end along the length direction of the extrusion head body, and flow out of the first accommodating chamber from the first liquid outlet. This increases the flow range of the cleaning liquid in the first accommodating chamber, thereby reducing the risk of the first coating slurry remaining in the first accommodating chamber.

[0009] In some embodiments, a wear-resistant layer is provided on the hole wall of the first liquid inlet hole and the hole wall of the first liquid outlet hole.

[0010] In the above technical solution, the hole wall of the first liquid inlet hole and the hole wall of the first liquid outlet hole are provided with a wear-resistant layer to increase the wear resistance of the hole wall of the first liquid inlet hole and the hole wall of the first liquid outlet hole, thereby reducing the risk of the hole wall of the first liquid inlet hole and the hole wall of the first liquid outlet hole being worn and damaged by the first coating slurry.

[0011] In some embodiments, the coating extrusion head further includes two first blocking members, which are used to block the first liquid inlet and the first liquid outlet, respectively.

[0012] In the above technical solution, the two first blocking members are used to block the first liquid inlet and the first liquid outlet respectively, thereby reducing the risk of the first coating slurry flowing out of the first accommodating cavity from the first liquid inlet and the first liquid outlet during the electrode coating process.

[0013] In some embodiments, the first accommodating chamber includes a main accommodating chamber and a buffer chamber. The extrusion head body has a coating lip. Along the first direction, the main accommodating chamber, the buffer chamber and the coating lip are arranged in sequence. The first direction is perpendicular to the length direction of the extrusion head body. The first liquid inlet and the first liquid outlet are connected to the main accommodating chamber.

[0014] In the above technical solution, the main receiving chamber, the buffer chamber and the coating lip are arranged in sequence along the first direction. The first liquid inlet and the first liquid outlet are connected to the main receiving chamber. The cleaning liquid entering the main receiving chamber from the first liquid inlet can pass through the main receiving chamber and the buffer chamber in sequence along the first direction and leave the buffer chamber from the coating lip. This increases the flow range of the cleaning liquid in the first receiving chamber, thereby reducing the risk of the first coating slurry remaining in the first receiving chamber.

[0015] In some embodiments, the extrusion head body is provided with a second liquid inlet and a second liquid outlet communicating with the buffer cavity, wherein the second liquid inlet is used for supplying the cleaning liquid into the buffer cavity, and the second liquid outlet is used for supplying the cleaning liquid out of the buffer cavity.

[0016] In the above technical solution, the extrusion head body is provided with a second liquid inlet hole and a second liquid outlet hole connected to the buffer cavity. Thus, after the cleaning liquid enters the first receiving cavity through the first liquid inlet hole and / or the second liquid inlet hole, it can flow out of the first receiving cavity through any one or more of the first liquid outlet hole, the second liquid outlet hole, and the coating lip. Thus, the flow range of the cleaning liquid in the first receiving cavity is increased, thereby reducing the risk of the first coating slurry remaining in the first receiving cavity.

[0017] In some embodiments, the extrusion head body includes a first extrusion die and a second extrusion die stacked along a second direction. Along the second direction, the first extrusion die has a first side facing the second extrusion die. The first side is provided with a first groove extending along the length direction of the extrusion head body. The second extrusion die and the first groove enclose a first accommodating cavity. The first direction, the second direction, and the length direction of the extrusion head body are perpendicular to each other.

[0018] In the above technical solution, the extrusion head body includes a first extrusion die and a second extrusion die. On the one hand, when the first coating slurry that is not easily washed away by the cleaning liquid appears in the first accommodating cavity, the extrusion head body is designed to be split, which is more conducive to cleaning the first coating slurry that is not easily washed away by the cleaning liquid in the first accommodating cavity by disassembling the first extrusion die and the second extrusion die; on the other hand, the split extrusion head body is easier to manufacture than the integrated coating extrusion head, so it can also reduce the manufacturing cost of the coating extrusion head.

[0019] In some embodiments, the extrusion head body further comprises a first gasket. Along the second direction, the first gasket is disposed between the first extrusion die and the second extrusion die. The first gasket has a first hollow area, and the main accommodating cavity and the buffer cavity are connected through the first hollow area.

[0020] In the above technical solution, the main containing chamber and the buffer chamber are connected through the first hollow area, so that the cleaning liquid can pass through the first hollow area, enter the buffer chamber from the main containing chamber, and / or enter the main containing chamber from the buffer chamber, thereby increasing the flow range of the cleaning liquid in the first containing chamber, and further reducing the risk of residual first coating slurry in the first containing chamber.

[0021] In some embodiments, a second accommodating cavity for accommodating the second coating slurry is provided inside the extrusion head body. The first accommodating cavity and the second accommodating cavity are arranged along the second direction. The extrusion head body is provided with a third liquid inlet and a third liquid outlet connected to the second accommodating cavity. The third liquid inlet is used for the cleaning liquid to enter the second accommodating cavity, and the third liquid outlet is used for the cleaning liquid to flow out of the second accommodating cavity.

[0022] In the above technical solution, the extrusion head body is provided with a third liquid inlet hole and a third liquid outlet hole which are connected with the second accommodating chamber. Therefore, when the second accommodating chamber needs to be cleaned, the cleaning liquid can be injected into the second accommodating chamber through the third liquid inlet hole, and the cleaning liquid flowing out of the second accommodating chamber can be collected through the third liquid outlet hole. Therefore, when cleaning the second accommodating chamber, the extrusion head body does not need to be disassembled. Therefore, the cleaning time of the second accommodating chamber is reduced, thereby reducing the downtime of the coating extrusion head.

[0023] In some embodiments, the extrusion head body further includes a third extrusion die. Along the third direction, the second extrusion die and the third extrusion die are stacked. Along the third direction, the second extrusion die has a second side facing the third extrusion die. The second side is provided with a second groove extending along the length direction of the extrusion head body. The third extrusion die and the second groove are combined to form a second accommodating cavity. The third direction is at an angle to the second direction, and the third direction is perpendicular to the length direction of the extrusion head body.

[0024] In the above technical solution, the extrusion head body also includes a third extrusion die. On the one hand, when the second coating slurry that is not easily washed away by the cleaning liquid appears in the second accommodating cavity, the extrusion head body is designed to be split, which is more conducive to cleaning the second coating slurry that is not easily washed away by the cleaning liquid in the second accommodating cavity by disassembling the third extrusion die and the second extrusion die; on the other hand, the split extrusion head body is easier to manufacture than the integrated coating extrusion head, so it can also reduce the manufacturing cost of the coating extrusion head.

[0025] In a second aspect, an embodiment of the present application provides a coating device, comprising a coating extrusion head provided by any embodiment of the first aspect.

[0026] In the above technical scheme, since the coating device has the coating extrusion head in the embodiment of the first aspect, the coating device also has the beneficial effects in the embodiment of the first aspect. Specifically, the coating extrusion head is provided with a first liquid inlet hole and a first liquid outlet hole which are connected to the first accommodating chamber. Therefore, when the first accommodating chamber needs to be cleaned, the cleaning liquid can be injected into the first accommodating chamber through the first liquid inlet hole, and the cleaning liquid flowing out of the first accommodating chamber can be collected through the first liquid outlet hole. Furthermore, when the first accommodating chamber is cleaned, there is no need to disassemble the extrusion head body. Thereby, the cleaning time of the first accommodating chamber is reduced, thereby reducing the downtime of the coating extrusion head. Therefore, the coating device in the embodiment of the present application can also reduce the downtime of the coating extrusion head.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of a coating extrusion head provided in some embodiments of the present application;

[0030] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0031] Figure 3 for Figure 2 Cross-sectional view of the middle BB;

[0032] Figure 4 for Figure 3 Cross-sectional view of CC;

[0033] Figure 5 A three-dimensional exploded view of a coating extrusion head provided in some embodiments of the present application;

[0034] Figure 6 A schematic structural diagram of a first extrusion die provided in some embodiments of the present application;

[0035] Figure 7 for Figure 3 Enlarged view of middle D;

[0036] Figure 8 A three-dimensional exploded view of another coating extrusion head provided in some embodiments of the present application;

[0037] Fig. 9 A cross-sectional view of another coating extrusion head provided for some embodiments of the present application.

[0038] Icon: 1000-Coating extrusion head;

[0039] 100-extrusion head body;

[0040] 10-first extrusion die; 10A-first side; 101-first groove; 101A-first sub-groove; 101B-second sub-groove; 102-partitioning member; 11-first accommodating chamber; 111-main accommodating chamber; 111A-first liquid inlet hole; 111B-first liquid outlet hole; 111C-first blocking member; 112-buffering chamber; 112A-second liquid inlet hole; 112B-second liquid outlet hole; 112C-second blocking member;

[0041] 20-second extrusion die; 20A-second side surface; 201-second groove; 21-second accommodating cavity; 21A-third liquid inlet hole; 21B-third liquid outlet hole;

[0042] 30-first gasket; 31-first hollow area;

[0043] 40-third extrusion die;

[0044] 50-second gasket; 51-second hollow area;

[0045] 60-lip coating;

[0046] X-first direction; Y-second direction; Z-length direction of the extrusion head body; N-third direction. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0049] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0053] The term "plurality" used in the present application refers to two or more (including two).

[0054] Pole coating refers to the process of evenly, continuously or intermittently coating the prepared coating slurry on the substrate (aluminum foil or copper foil) during the production of lithium batteries, which is one of the key steps in preparing batteries. Coating needs to ensure the consistency of thickness at each coating position and control the coating thickness within the tolerance range required by the process. The quality and stability of the pole coating process have an important impact on battery performance and cycle life.

[0055] There are two commonly used coating methods in China: transfer coating and extrusion coating. Transfer coating is a mature technology, but its structure is complex and the equipment debugging is cumbersome. Moreover, the slurry of transfer coating is in an exposed state (that is, the coating slurry is exposed to the air), and the performance of the coating slurry is difficult to guarantee.

[0056] The technology of extrusion coating machine is becoming more and more mature. It has simple structure, compact equipment and convenient debugging. In addition, the coating slurry in the coating head is in a closed state and isolated from the outside world, which can ensure the excellent quality of the coating slurry. Moreover, the coating accuracy of the extrusion coating machine is much higher than that of the traditional transfer coating machine. The current experimental results show that the minimum thickness limit of transfer coating is 50um, while the extrusion coating can reach 20um. Therefore, it has become a development trend to use extrusion coating machine to coat lithium-ion battery pole pieces.

[0057] The coating extrusion head is an important component of the coating device, which is used to evenly apply the coating slurry on the surface of the substrate. The coating extrusion head usually has a first accommodating cavity inside to accommodate the coating slurry.

[0058] The coating slurry is generally formed by graphite with solvent and auxiliary materials. When the coating extrusion head is used frequently, the coating slurry will adhere to the inner wall of the first receiving chamber. This will cause the coating slurry to flow unevenly, thereby affecting the coating quality. Therefore, it is necessary to clean the first receiving chamber of the coating extrusion head regularly.

[0059] At present, when cleaning the first accommodating chamber, the related technology generally removes the coating extrusion head from the coating device and transfers it outside the production line for disassembly and cleaning. After cleaning, it is assembled and installed back to the coating device, and debugged. After confirmation, the machine will be turned on to continue the coating operation. In addition to the cleaning time, this will also consume the time for disassembly, transfer, transfer and debugging, resulting in a long downtime caused by cleaning the coating extrusion head.

[0060] In view of this, in order to reduce the downtime caused by cleaning the coating extrusion head, the present application provides a coating extrusion head. The coating extrusion head is provided with a first liquid inlet hole and a first liquid outlet hole connected to the first accommodating cavity. Therefore, when the first accommodating cavity needs to be cleaned, the cleaning liquid can be injected into the first accommodating cavity through the first liquid inlet hole, and the cleaning liquid flowing out of the first accommodating cavity can be collected through the first liquid outlet hole. Furthermore, when cleaning the first accommodating cavity, there is no need to disassemble, transfer, assemble and debug the extrusion head body. Thereby reducing the time required for cleaning the first accommodating cavity, thereby reducing the downtime of the coating extrusion head.

[0061] The specific structure of the coating extrusion head is described in detail below with reference to the accompanying drawings.

[0062] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of a coating extrusion head 1000 provided in some embodiments of the present application. Figure 2 for Figure 1 A cross-sectional view of AA in the figure. The embodiment of the present application provides a coating extrusion head 1000 including an extrusion head body 100. A first accommodating chamber 11 for accommodating a first coating slurry is provided inside the extrusion head body 100. A first liquid inlet 111A and a first liquid outlet 111B connected to the first accommodating chamber 11 are provided on the extrusion head body 100. The first liquid inlet 111A is used to supply cleaning liquid to enter the first accommodating chamber 11, and the first liquid outlet 111B is used to supply cleaning liquid to flow out of the first accommodating chamber 11.

[0063] The extrusion head body 100 is a part of the coating device for uniformly coating the coating slurry on the surface of the substrate.

[0064] The first accommodating cavity 11 is a cavity in the extrusion head body 100 for accommodating the first coating slurry.

[0065] The first liquid inlet hole 111A is a through hole in the extrusion head body 100 that connects the outside with the first accommodating chamber 11 and is used for the cleaning liquid to enter the first accommodating chamber 11 .

[0066] The first liquid outlet 111B is a through hole in the extrusion head body 100 that connects the outside with the first accommodating chamber 11 and is used for allowing the cleaning liquid to flow out of the first accommodating chamber 11 .

[0067] It can be understood that during the electrode coating process, the first liquid inlet hole 111A and the first liquid outlet hole 111B are in a blocked state to reduce the risk of the first coating slurry flowing out of the first accommodating cavity 11 from the first liquid inlet hole 111A and the first liquid outlet hole 111B.

[0068] It can be understood that the first liquid inlet hole 111A can also be used to allow the cleaning liquid to flow out of the first accommodating chamber 11 , and the first liquid outlet hole 111B can also be used to allow the cleaning liquid to enter the first accommodating chamber 11 .

[0069] Exemplarily, the cleaning liquid can enter the first accommodating chamber 11 through the first liquid inlet hole 111A and leave the first accommodating chamber 11 through the first liquid outlet hole 111B; alternatively, the cleaning liquid can also enter the first accommodating chamber 11 through the first liquid outlet hole 111B and leave the first accommodating chamber 11 through the first liquid inlet hole 111A.

[0070] In some embodiments, the cleaning liquid can be clean water. An internal thread is provided on the hole wall of the first liquid inlet hole 111A and the first liquid outlet hole 111B away from the end of the first accommodating chamber 11. When cleaning, it is convenient for the first connecting pipe (not shown in the figure) and the second connecting pipe (not shown in the figure) with external threads to be threadedly connected with the first liquid inlet hole 111A and the first liquid outlet hole 111B respectively. Among them, the first connecting pipe is connected to the clean water source, and the clean water source injects the cleaning liquid into the first accommodating chamber 11 at a certain pressure through the first connecting pipe (not shown in the figure) and the first liquid inlet hole 111A. The second connecting pipe (not shown in the figure) is connected to the sewage collection device so that the cleaning liquid of the first accommodating chamber 11 enters the sewage collection device through the first liquid outlet hole 111B and the second connecting pipe (not shown in the figure). The above-mentioned clean water source can be a water pump or a water valve, and the above-mentioned sewage collection device can be a water tank, a bucket or a sewage treatment equipment.

[0071] In the above scheme, the extrusion head body 100 is provided with a first liquid inlet hole 111A and a first liquid outlet hole 111B which are connected to the first accommodating chamber 11. Therefore, when the first accommodating chamber 11 needs to be cleaned, the cleaning liquid can be injected into the first accommodating chamber 11 through the first liquid inlet hole 111A, and the cleaning liquid flowing out of the first accommodating chamber 11 can be collected through the first liquid outlet hole 111B. Therefore, when cleaning the first accommodating chamber 11, there is no need to disassemble, transfer, assemble and debug the extrusion head body 100. Therefore, the time required for cleaning the first accommodating chamber 11 is reduced, thereby reducing the downtime of the coating extrusion head 1000.

[0072] According to some embodiments of the present application, referring to Figure 1 , and please refer to Figure 2The first liquid inlet hole 111A and the first liquid outlet hole 111B are respectively located at two ends of the first accommodating cavity 11 in the length direction Z of the extrusion head body 100 .

[0073] In the above scheme, the first liquid inlet hole 111A and the first liquid outlet hole 111B are respectively located at the two ends of the first accommodating chamber 11 in the length direction Z of the extrusion head body 100. In this way, after the cleaning liquid enters the first accommodating chamber 11 from the first liquid inlet hole 111A, it will flow from one end of the first accommodating chamber 11 to the other end along the length direction Z of the extrusion head body 100, thereby passing through most of the cavity walls of the first accommodating chamber 11, and flowing out of the first accommodating chamber 11 from the first liquid outlet hole 111B. In this way, the flow range of the cleaning liquid in the first accommodating chamber 11 is increased, and the cleaning liquid can clean or rinse most of the cavity walls in the first accommodating chamber 11, thereby reducing the risk of the first coating slurry remaining in the first accommodating chamber 11.

[0074] According to some embodiments of the present application, a wear-resistant layer is provided on the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B.

[0075] The wear-resistant layer is a surface coating located on the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B, and is used to enhance the wear resistance of the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B.

[0076] For example, the wear-resistant layer can be formed on the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B by carburizing and nitriding processes; or, the wear-resistant layer can also be formed by plating metal materials such as chrome and nickel on the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B.

[0077] It is understandable that after the drilling process of the first liquid inlet hole 111A and the first liquid outlet hole 111B is completed, the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B should be ground to remove the burrs generated by the drilling and reduce the friction coefficient of the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B. Then the process of carburizing, nitriding or chrome plating, nickel plating is carried out, and after the above process is completed, the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B are ground again, so as to further reduce the friction coefficient of the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B. This is beneficial to increase the flow rate of the cleaning liquid in the first accommodating chamber 11 and improve the cleaning effect.

[0078] In the above solution, the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B are provided with a wear-resistant layer to increase the wear resistance of the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B. This reduces the risk of scratching the hole wall of the first liquid inlet hole 111A and the hole wall of the first liquid outlet hole 111B when the cleaning liquid drives the first coating slurry adhered to the first accommodating cavity 11 to leave the first accommodating cavity 11 from the first liquid inlet hole 111A and the first liquid outlet hole 111B.

[0079] According to some embodiments of the present application, referring to Figure 1 , and please refer to Figure 2 The coating extrusion head 1000 further includes two first blocking members 111C, and the two first blocking members 111C are used to block the first liquid inlet 111A and the first liquid outlet 111B respectively.

[0080] The first blocking member 111C refers to a component in the coating extrusion head 1000 used to block the first liquid inlet hole 111A and the first liquid outlet hole 111B during the electrode coating process.

[0081] Taking the first blocking member 111C blocking the first liquid inlet hole 111A as an example, at least part of the first blocking member 111C is located in the first liquid inlet hole 111A, and along the radial direction of the first liquid inlet hole 111A, the outer peripheral surface of the first blocking member 111C abuts against the hole wall of the first liquid inlet hole 111A to block the first liquid inlet hole 111A.

[0082] The first blocking member 111C may be made of one or more materials selected from the group consisting of stainless steel, aluminum alloy and copper.

[0083] The above-mentioned stainless steel refers to an alloy steel composed of iron, chromium, nickel and other elements, wherein the chromium content is usually above 10.5%. It has the characteristics of anti-oxidation and corrosion resistance, and can keep the surface smooth and rust-free at room temperature.

[0084] The above-mentioned aluminum alloy is an alloy material composed of aluminum as the main alloy element and mixed with other metal or non-metal elements, and has the advantages of corrosion resistance.

[0085] The first blocking member 111C may be connected to the first liquid inlet hole 111A and the first liquid outlet hole 111B by means of threads; or, the first blocking member 111C may be connected to the first liquid inlet hole 111A and the first liquid outlet hole 111B by means of snap-fit ​​connections.

[0086] In some embodiments, the first liquid inlet 111A and the first liquid outlet 111B are respectively located at the two ends of the first accommodating chamber 11 in the length direction Z of the extrusion head body 100. The coating extrusion head 1000 also includes two sealing gaskets (not shown in the figure), which are respectively sleeved outside the two first blocking members 111C, and at least part of the two sealing gaskets (not shown in the figure) are respectively sandwiched between the two first blocking members 111C and the two ends of the extrusion head body 100 in the length direction Z along the extrusion head body 100. To fill the gap between the first blocking member 111C and the extrusion head body 100 in the length direction Z of the extrusion head body 100, thereby reducing the risk of the first coating slurry flowing out of the first accommodating chamber 11 from the first liquid inlet 111A and the first liquid outlet 111B during the electrode coating process.

[0087] In the above solution, the two first blocking members 111C are used to block the first liquid inlet 111A and the first liquid outlet 111B respectively, thereby reducing the risk of the first coating slurry flowing out of the first accommodating chamber 11 from the first liquid inlet 111A and the first liquid outlet 111B during the electrode coating process.

[0088] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 3 , Figure 3 for Figure 2 The first accommodating chamber 11 includes a main accommodating chamber 111 and a buffer chamber 112. The extrusion head body 100 has a coating lip 60. Along the first direction X, the main accommodating chamber 111, the buffer chamber 112 and the coating lip 60 are arranged in sequence. The first direction X is perpendicular to the length direction Z of the extrusion head body 100. Among them, the first liquid inlet 111A and the first liquid outlet 111B are connected to the main accommodating chamber 111.

[0089] The main accommodating chamber 111 is a portion of the first accommodating chamber 11 for communicating with a liquid inlet passage (not shown in the figure) of the first coating slurry.

[0090] The buffer chamber 112 is a chamber used to buffer the first coating slurry flowing out of the main containing chamber 111 to make its flow rate more uniform.

[0091] It can be understood that, on a plane perpendicular to the length direction Z of the extrusion head body 100 , the area of ​​the orthographic projection of the main accommodating cavity 111 is larger than the area of ​​the orthographic projection of the buffer cavity 112 .

[0092] The coating lip 60 is a spraying port of the coating extrusion head 1000, and the first coating slurry to be sprayed flows through the coating lip 60 and is sprayed onto the substrate. The coating lip 60 of the coating extrusion head 1000 may have an elongated slit, and the first coating slurry flows out of the slit and is sprayed onto the substrate. The size of the slit in the coating lip 60 in the second direction Y and the pressure during spraying jointly determine the shape, direction, coverage, etc. of the first coating slurry when spraying the first coating slurry.

[0093] It can be understood that the coating lip 60 and the buffer cavity 112 are in communication with each other, so that the first coating slurry in the buffer cavity 112 can be sprayed onto the substrate through the coating lip 60 .

[0094] Exemplarily, the first coating slurry enters the main containing chamber 111 from the first coating slurry liquid inlet channel (not shown in the figure), then enters the buffer chamber 112 to adjust the flow rate, and finally is sprayed onto the substrate through the coating lip 60 .

[0095] “The first liquid inlet hole 111A and the first liquid outlet hole 111B are connected to the main containing chamber 111” can be understood as the first liquid inlet hole 111A is a through hole in the extrusion head body 100 that connects the outside world with the main containing chamber, so as to allow the cleaning liquid to enter the main containing chamber 111. The first liquid outlet hole 111B is a through hole in the extrusion head body 100 that connects the outside world with the main containing chamber, so as to allow the cleaning liquid to flow out of the main containing chamber 111.

[0096] In some embodiments, the first liquid inlet 111A and the first liquid outlet 111B are respectively located at the two ends of the main accommodating chamber 111 in the length direction Z of the extrusion head body 100, and the cleaning liquid enters the main accommodating chamber 111 through the first liquid inlet 111A, wherein a part of the cleaning liquid flows to the other end of the main accommodating chamber 111 along the length direction Z of the extrusion head body 100, and flows out of the main accommodating chamber 111 through the first liquid outlet 111B, thereby cleaning the main accommodating chamber 111. Another part of the cleaning liquid passes through the main accommodating chamber 111 and the buffer chamber 112 in sequence along the first direction X, and leaves the buffer chamber 112 from the coating lip 60, thereby cleaning the buffer chamber 112 and the cloth lip.

[0097] The first direction X may be parallel to the width direction of the extrusion head body 100, and the second direction may be parallel to the gravity direction and parallel to the height direction of the extrusion head body 100. The second direction Y is perpendicular to the first direction X and the length direction Z of the extrusion head body 100.

[0098] In the above scheme, the main containing chamber 111, the buffer chamber 112 and the coating lip 60 are arranged in sequence along the first direction X. The first liquid inlet 111A and the first liquid outlet 111B are connected to the main containing chamber 111. So that the cleaning liquid entering the main containing chamber 111 from the first liquid inlet 111A can flow out of the main containing chamber 111 through the first liquid outlet 111B. It can also pass through the main containing chamber 111 and the buffer chamber 112 in sequence along the first direction X, and leave the buffer chamber 112 from the coating lip 60. Thereby, the flow range of the cleaning liquid in the first containing chamber 11 is increased, thereby reducing the risk of the first coating slurry remaining in the first containing chamber 11.

[0099] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 , Figure 4 for Figure 3 The extrusion head body 100 is provided with a second liquid inlet 112A and a second liquid outlet 112B which are connected to the buffer chamber 112. The second liquid inlet 112A is used for supplying the cleaning liquid into the buffer chamber 112, and the second liquid outlet 112B is used for supplying the cleaning liquid out of the buffer chamber 112.

[0100] The second liquid inlet hole 112A is a through hole in the extrusion head body 100 that connects the outside with the buffer cavity 112 and is used for the cleaning liquid to enter the buffer cavity 112 .

[0101] The second liquid outlet 112B is a through hole in the extrusion head body 100 that connects the outside with the buffer chamber 112 and is used for allowing the cleaning liquid to flow out of the buffer chamber 112 .

[0102] Exemplarily, the second liquid inlet 112A and the second liquid outlet 112B are respectively located at the two ends of the buffer cavity 112 in the length direction Z of the extrusion head body 100. In this way, after the cleaning liquid enters the buffer cavity 112 from the second liquid inlet 112A, it will flow from one end of the buffer cavity 112 to the other end along the length direction Z of the extrusion head body 100, thereby passing through most of the cavity wall of the buffer cavity 112, and flowing out of the buffer cavity 112 from the second liquid outlet 112B. Thereby, the risk of the first coating slurry remaining in the buffer cavity 112 is reduced.

[0103] It can be understood that during the electrode coating process, the second liquid inlet hole 112A and the second liquid outlet hole 112B are in a blocked state to reduce the risk of the first coating slurry flowing out of the first accommodating cavity 11 from the second liquid inlet hole 112A and the second liquid outlet hole 112B.

[0104] In some embodiments, the coating extrusion head 1000 further includes two second blocking members 112C, and the two second blocking members 112C are used to block the second liquid inlet 112A and the second liquid outlet 112B, respectively.

[0105] It can be understood that the second liquid inlet hole 112A can also be used to allow the cleaning liquid to flow out of the buffer chamber 112 , and the second liquid outlet hole 112B can also be used to allow the cleaning liquid to enter the buffer chamber 112 .

[0106] Exemplarily, the cleaning liquid can enter the first accommodating chamber 11 through the first liquid inlet hole 111A, and leave the first accommodating chamber 11 through the second liquid inlet hole 112A, the first liquid outlet hole 111B, the second liquid outlet hole 112B and the coating lip 60; alternatively, the cleaning liquid can also enter the first accommodating chamber 11 through the first liquid inlet hole 111A and the second liquid inlet hole 112A, and leave the first accommodating chamber 11 through the first liquid outlet hole 111B, the second liquid outlet hole 112B and the coating lip 60.

[0107] In the above solution, the extrusion head body 100 is provided with a second liquid inlet hole 112A and a second liquid outlet hole 112B which are in communication with the buffer cavity 112. Thus, after the cleaning liquid enters the first accommodating cavity 11 through the first liquid inlet hole 111A and / or the second liquid inlet hole 112A, it can flow out of the first accommodating cavity 11 through any one or more of the first liquid outlet hole 111B, the second liquid outlet hole 112B, and the coating lip 60. Thus, the flow range of the cleaning liquid in the first accommodating cavity 11 is increased, thereby reducing the risk of the first coating slurry remaining in the first accommodating cavity 11.

[0108] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 5 and Figure 6 , Figure 5 A three-dimensional exploded view of a coating extrusion head 1000 provided in some embodiments of the present application, Figure 6 A schematic diagram of the structure of the first extrusion die 10 provided for some embodiments of the present application. The extrusion head body 100 includes a first extrusion die 10 and a second extrusion die 20 stacked along a second direction Y. Along the second direction Y, the first extrusion die 10 has a first side surface 10A facing the second extrusion die 20. The first side surface 10A is provided with a first groove 101 extending along the length direction Z of the extrusion head body 100. The second extrusion die 20 and the first groove 101 enclose a first accommodating cavity 11.

[0109] The first extrusion die 10 and the second extrusion die 20 are main parts of the extrusion head body 100 .

[0110] It can be understood that the first extrusion die 10 and the second extrusion die 20 are generally metal parts to have higher strength and rigidity, so as to reduce the risk of deformation of the extrusion head body 100 when the pressure in the first accommodating chamber 11 is too high.

[0111] Exemplarily, the first extrusion die 10 and the second extrusion die 20 may be connected by screws, or the first extrusion die 10 and the second extrusion die 20 may be connected by snaps, or the first extrusion die 10 and the second extrusion die 20 may be clamped by a clamp.

[0112] The first side surface 10A is along the second direction Y, and is a side surface of the first extrusion die 10 facing the second extrusion die 20 .

[0113] It can be understood that the first side surface 10A and the surface of the second extrusion die 20 facing the first side surface 10A can be provided with a wear-resistant material layer to reduce the wear of the first coating slurry on the first extrusion die 10 and the second extrusion die 20 to extend the service life of the extrusion head body 100.

[0114] The first groove 101 is a groove formed by the first side surface 10A being recessed along the second direction Y away from the second extrusion die 20 .

[0115] “The second extrusion die 20 and the first groove 101 enclose the first accommodating cavity 11” can be understood as the inner wall of the first groove 101 and the part of the side of the second extrusion die 20 facing the first extrusion die 10 enclose the first accommodating cavity 11. Since only the first side 10A is provided with the first groove 101, the manufacturing of the side of the second extrusion die 20 facing the first extrusion die 10 can be relatively simple, thereby reducing the manufacturing cost of the extrusion head body 100.

[0116] It can be understood that the shape of the cross section of the first groove 101 is not particularly limited, but the cross-sectional area of ​​the first groove 101 should be the same, so that the cross-sectional area of ​​the first accommodating cavity 11 corresponding to the first groove 101 should be equal.

[0117] In some embodiments, the first extrusion die 10 further includes a separator 102, which is disposed on the bottom wall of the first groove 101 to separate the first groove 101 into a first sub-groove 101A and a second sub-groove 101B arranged along the first direction X. The extrusion head body 100 has a first liquid inlet 111A, a first liquid outlet 111B, a second liquid inlet 112A, and a second liquid outlet 112B. The first liquid inlet 111A and the first liquid outlet 111B are respectively connected to both ends of the first sub-groove 101A in the length direction Z of the extrusion head body 100. The liquid inlet channel of the first coating slurry is connected to the first sub-groove 101A. The second liquid inlet 112A and the second liquid outlet 112B are respectively connected to both ends of the second sub-groove 101B in the length direction Z of the extrusion head body 100. The second extrusion die 20 and the first sub-groove 101A together form a main accommodating cavity 111 , and the second extrusion die 20 and the second sub-groove 101B together form a buffer cavity 112 .

[0118] In the above scheme, the extrusion head body 100 includes a first extrusion die 10 and a second extrusion die 20. On the one hand, when the first coating slurry that is not easily washed away by the cleaning liquid appears in the first accommodating cavity 11, the extrusion head body 100 is designed as a split type, which is more conducive to cleaning the first coating slurry that is not easily washed away by the cleaning liquid in the first accommodating cavity 11 by disassembling the first extrusion die 10 and the second extrusion die 20; on the other hand, the split extrusion head body 100 is easier to manufacture than the integrated coating extrusion head 1000, so the manufacturing cost of the coating extrusion head 1000 can also be reduced.

[0119] According to some embodiments of the present application, referring to Figure 5 , and please refer to Figure 6 and Figure 7 , Figure 7 for Figure 3 The extrusion head body 100 further includes a first gasket 30. The first gasket 30 is disposed between the first extrusion die 10 and the second extrusion die 20 along the second direction Y. The first gasket 30 has a first hollow area 31, and the main accommodating cavity 111 and the buffer cavity 112 are connected through the first hollow area 31.

[0120] The first gasket 30 is a component sandwiched between the first extrusion die 10 and the second extrusion die 20 in the extrusion head body 100 .

[0121] It can be understood that the size of the first gasket 30 in the second direction Y determines the size of the gap in the coating lip 60 in the second direction Y, thereby affecting the shape, direction and coverage of the coating of the first coating slurry.

[0122] The first hollow area 31 refers to a hollow area formed in the first gasket 30 by cutting, hollowing out or other methods.

[0123] In some embodiments, the first groove 101 is divided into a first sub-groove 101A and a second sub-groove 101B arranged along the first direction X. On a plane perpendicular to the second direction Y, the orthographic projections of the first sub-groove 101A and the second sub-groove 101B overlap with the orthographic projection of the first hollow area 31 .

[0124] In the above scheme, the main containing chamber 111 and the buffer chamber 112 are connected through the first hollow area 31, so that the cleaning liquid can pass through the first hollow area 31, from the main containing chamber 111 into the buffer chamber 112, and / or, from the buffer chamber 112 into the main containing chamber 111, thereby increasing the flow range of the cleaning liquid in the first containing chamber 11, and further reducing the risk of residual first coating slurry in the first containing chamber 11.

[0125] According to some embodiments of the present application, referring to Figure 8 , and please refer to Fig. 9 , Figure 8 A three-dimensional exploded view of another coating extrusion head 1000 provided in some embodiments of the present application, Fig. 9 A cross-sectional view of another coating extrusion head 1000 provided for some embodiments of the present application. A second accommodating chamber 21 for accommodating a second coating slurry is provided inside the extrusion head body 100. The first accommodating chamber 11 and the second accommodating chamber 21 are arranged along the second direction Y. The extrusion head body 100 is provided with a third liquid inlet 21A and a third liquid outlet 21B connected to the second accommodating chamber 21. The third liquid inlet 21A is used for supplying cleaning liquid into the second accommodating chamber 21, and the third liquid outlet 21B is used for supplying cleaning liquid out of the second accommodating chamber 21.

[0126] The second accommodating cavity 21 is a cavity in the extrusion head body 100 for accommodating the second coating slurry.

[0127] The third liquid inlet hole 21A is a through hole in the extrusion head body 100 that connects the outside with the second accommodating chamber 21 and is used for allowing the cleaning liquid to enter the second accommodating chamber 21 .

[0128] The third liquid outlet 21B is a through hole in the extrusion head body 100 that connects the outside with the second accommodating chamber 21 and is used for allowing the cleaning liquid to flow out of the second accommodating chamber 21 .

[0129] It can be understood that during the electrode coating process, the third liquid inlet hole 21A and the third liquid outlet hole 21B are in a blocked state to reduce the risk of the second coating slurry flowing out of the second accommodating cavity 21 from the third liquid inlet hole 21A and the third liquid outlet hole 21B.

[0130] It can be understood that the third liquid inlet hole 21A can also be used to allow the cleaning liquid to flow out of the second accommodating chamber 21 , and the third liquid outlet hole 21B can also be used to allow the cleaning liquid to enter the second accommodating chamber 21 .

[0131] Exemplarily, the cleaning liquid can enter the second accommodating chamber 21 through the third liquid inlet hole 21A and leave the second accommodating chamber 21 through the third liquid outlet hole 21B; alternatively, the cleaning liquid can also enter the second accommodating chamber 21 through the third liquid outlet hole 21B and leave the second accommodating chamber 21 through the third liquid inlet hole 21A.

[0132] In the above solution, the extrusion head body 100 is provided with a third liquid inlet hole 21A and a third liquid outlet hole 21B which are in communication with the second accommodating chamber 21. Therefore, when the second accommodating chamber 21 needs to be cleaned, the cleaning liquid can be injected into the second accommodating chamber 21 through the third liquid inlet hole 21A, and the cleaning liquid flowing out of the second accommodating chamber 21 can be collected through the third liquid outlet hole 21B. Therefore, when cleaning the second accommodating chamber 21, it is not necessary to disassemble the extrusion head body 100. Therefore, the cleaning time of the second accommodating chamber 21 is reduced, thereby reducing the downtime of the coating extrusion head 1000.

[0133] According to some embodiments of the present application, the extrusion head body 100 further includes a third extrusion die 40. Along the third direction N, the second extrusion die 20 and the third extrusion die 40 are stacked. Along the third direction N, the second extrusion die 20 has a second side 20A facing the third extrusion die 40. The second side 20A is provided with a second groove 201 extending along the length direction Z of the extrusion head body 100. The third extrusion die 40 and the second groove 201 are enclosed to form a second accommodating cavity 21. The third direction N is at an angle to the second direction Y, and the third direction N is perpendicular to the length direction Z of the extrusion head body 100.

[0134] The third extrusion die 40 is a part of the main body of the extrusion head body 100 .

[0135] It is understandable that the third extrusion die 40 is generally a metal part to have higher strength and rigidity, thereby reducing the risk of excessive pressure in the second accommodating cavity 21 causing deformation of the extrusion head body 100 .

[0136] For example, the third extrusion die 40 and the second extrusion die 20 may be connected by screws, or the third extrusion die 40 and the second extrusion die 20 may be connected by snap-fits, or the third extrusion die 40 and the second extrusion die 20 may be clamped by a clamp.

[0137] The third direction N forms an angle with the second direction Y, and the third direction N is perpendicular to the length direction Z of the extrusion head body 100 .

[0138] The second side surface 20A is along the third direction N and is a side surface of the second extrusion die 20 facing the third extrusion die 40 .

[0139] It can be understood that the second side surface 20A and the surface of the third extrusion die 40 facing the second side surface 20A can be provided with a wear-resistant material layer to reduce the wear of the second coating slurry on the second extrusion die 20 and the third extrusion die 40 to extend the service life of the extrusion head body 100.

[0140] The second groove 201 is a groove formed by the second side surface 20A being recessed along the third direction N away from the third extrusion die 40 .

[0141] “The third extrusion die 40 and the second groove 201 enclose the second accommodating cavity 21” can be understood as the inner wall of the first groove 101 and the part of the side of the third extrusion die 40 facing the second extrusion die 20 enclose the second accommodating cavity 21. Since only the second side 20A is provided with the second groove 201, the manufacturing of the third extrusion die 40 can be relatively simple, thereby reducing the manufacturing cost of the extrusion head body 100.

[0142] It can be understood that the shape of the cross section of the second groove 201 is not particularly limited, but the cross-sectional area of ​​the second groove 201 should be the same, so that the cross-sectional area of ​​the second accommodating cavity 21 corresponding to the second groove 201 should be equal.

[0143] In some embodiments, the second extrusion die 20 has a third liquid inlet 21A and a third liquid outlet 21B, wherein the third liquid inlet 21A and the third liquid outlet 21B are respectively connected to two ends of the second groove 201 in the length direction Z of the extrusion head body 100 .

[0144] In the above scheme, the extrusion head body 100 also includes a third extrusion die 40. On the one hand, when the second coating slurry that is not easily washed away by the cleaning liquid appears in the second accommodating cavity 21, the extrusion head body 100 is designed as a split type, which is more conducive to cleaning the second coating slurry that is not easily washed away by the cleaning liquid in the second accommodating cavity 21 by disassembling the third extrusion die 40 and the second extrusion die 20; on the other hand, the split extrusion head body 100 is easier to manufacture than the integrated coating extrusion head 1000, so the manufacturing cost of the coating extrusion head 1000 can also be reduced.

[0145] An embodiment of the present application provides a coating device, including the coating extrusion head 1000 provided by any one of the above embodiments.

[0146] According to the coating device in the embodiment of the present application, since it has the coating extrusion head 1000 provided by any of the above embodiments, the coating device also has the beneficial effects of the coating extrusion head 1000 provided by any of the above embodiments. Specifically, the coating extrusion head 1000 is provided with a first liquid inlet hole 111A and a first liquid outlet hole 111B connected to the first accommodating chamber 11. Therefore, when it is necessary to clean the first accommodating chamber 11, the cleaning liquid can be injected into the first accommodating chamber 11 through the first liquid inlet hole 111A, and the cleaning liquid flowing out of the first accommodating chamber 11 can be collected through the first liquid outlet hole 111B. Therefore, when cleaning the first accommodating chamber 11, there is no need to disassemble the extrusion head body 100. Thereby, the cleaning time of the first accommodating chamber 11 is reduced, thereby reducing the downtime of the coating extrusion head 1000, and increasing the production efficiency of the electrode. Therefore, the coating device in the embodiment of the present application can also reduce the downtime of the coating extrusion head 1000.

[0147] Please refer to Figure 6 , Figure 8 and Fig. 9 The embodiment of the present application provides a coating extrusion head 1000 including an extrusion head body 100 , and the extrusion head body 100 includes a first extrusion die 10 , a second extrusion die 20 , a third extrusion die 40 , a first gasket 30 and a second gasket 50 .

[0148] The first extrusion die 10, the first gasket 30 and the second extrusion die 20 are stacked in sequence along the second direction Y. The first extrusion die 10 has a first side surface 10A facing the second extrusion die 20. The first side surface 10A is provided with a first groove 101 extending along the length direction Z of the extrusion head body 100.

[0149] The first extrusion die 10 also includes a separator 102, which is arranged on the bottom wall of the first groove 101 to separate the first groove 101 into a first sub-groove 101A and a second sub-groove 101B arranged along the first direction X. The first extrusion die 10 has a first liquid inlet 111A, a first liquid outlet 111B, a second liquid inlet 112A, and a second liquid outlet 112B. Among them, the first liquid inlet 111A and the first liquid outlet 111B are respectively connected to the two ends of the first sub-groove 101A in the length direction Z of the extrusion head body 100. The liquid inlet channel (not shown in the figure) of the first coating slurry is connected to the first sub-groove 101A. The second liquid inlet 112A and the second liquid outlet 112B are respectively connected to the two ends of the second sub-groove 101B in the length direction Z of the extrusion head body 100. The second extrusion die 20 and the first sub-groove 101A together form a main accommodating cavity 111 , and the second extrusion die 20 and the second sub-groove 101B together form a buffer cavity 112 .

[0150] The extrusion head body 100 has a coating lip 60. Along the first direction X, the main accommodating cavity 111, the buffer cavity 112 and the coating lip 60 are arranged in sequence and communicated in sequence.

[0151] The first gasket 30 has a first hollow area 31 . On a plane perpendicular to the second direction Y, the orthographic projections of the first sub-groove 101A and the second sub-groove 101B overlap with the orthographic projection of the first hollow area 31 .

[0152] The second extrusion die 20, the second gasket 50 and the third extrusion die 40 are stacked along the third direction N. The second extrusion die 20 has a second side surface 20A facing the third extrusion die 40. The second side surface 20A is provided with a second groove 201 extending along the length direction Z of the extrusion head body 100.

[0153] The second extrusion die 20 has a third liquid inlet 21A and a third liquid outlet 21B. The third liquid inlet 21A and the third liquid outlet 21B are respectively connected to the two ends of the second groove 201 in the length direction Z of the extrusion head body 100. The liquid inlet channel (not shown in the figure) of the second coating slurry is connected to the second groove 201.

[0154] The second gasket 50 has a second hollow area 51 , and on a plane perpendicular to the third direction N, the orthographic projection of the second groove 201 overlaps with the orthographic projection of the second hollow area 51 .

[0155] Along a direction parallel to the second side surface 20A and perpendicular to the length direction Z of the extrusion head body 100 , the second accommodating cavity 21 and the coating lip 60 are sequentially arranged and communicated.

[0156] In the above scheme, the extrusion head body 100 is provided with a first liquid inlet hole 111A and a first liquid outlet hole 111B communicating with the main accommodating chamber 111, a second liquid inlet hole 112A and a second liquid outlet hole 112B communicating with the buffer chamber 112, and a third liquid inlet hole 21A and a third liquid outlet hole 21B communicating with the second accommodating chamber 21. Therefore, when it is necessary to clean the first accommodating chamber 11, the cleaning liquid can be injected into the first accommodating chamber 11 through the first liquid inlet hole 111A and the second liquid inlet hole 112A, and the cleaning liquid flowing out of the first accommodating chamber 11 can be collected through the first liquid outlet hole 111B and the second liquid inlet hole 112A. Therefore, when cleaning the first accommodating chamber 11, there is no need to disassemble, transfer, assemble and debug the extrusion head body 100. Therefore, the time required for cleaning the first accommodating chamber 11 is reduced, thereby reducing the downtime of the coating extrusion head 1000. At the same time, when cleaning the first accommodating chamber 11, the cleaning liquid can be injected into the second accommodating chamber 21 through the third liquid inlet hole 21A, and the cleaning liquid flowing out of the second accommodating chamber 21 can be collected through the third liquid outlet hole 21B. Thus, the first accommodating chamber 11 and the second accommodating chamber 21 can be cleaned at the same time. Thus, the time required for cleaning the first accommodating chamber 11 is reduced, thereby reducing the downtime of the coating extrusion head 1000.

[0157] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0158] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coating extrusion head, characterized in that: include: An extrusion head body, wherein a first accommodating cavity for accommodating a first coating slurry is provided inside the extrusion head body, and a first liquid inlet hole and a first liquid outlet hole communicating with the first accommodating cavity are provided on the extrusion head body; The first liquid inlet hole is used for supplying cleaning liquid into the first containing chamber, and the first liquid outlet hole is used for supplying cleaning liquid out of the first containing chamber.

2. The coating extrusion head according to claim 1, characterized in that: The first liquid inlet hole and the first liquid outlet hole are respectively located at two ends of the first accommodating cavity in the length direction of the extrusion head body.

3. The coating extrusion head according to claim 1, characterized in that: The hole wall of the first liquid inlet hole and the hole wall of the first liquid outlet hole are provided with a wear-resistant layer.

4. The coating extrusion head according to claim 1, characterized in that: The coating extrusion head further includes two first blocking members, which are used to block the first liquid inlet and the first liquid outlet, respectively.

5. The coating extrusion head according to claim 1, characterized in that: The first accommodating chamber includes a main accommodating chamber and a buffer chamber, the extrusion head body has a coating lip, and the main accommodating chamber, the buffer chamber and the coating lip are arranged in sequence along a first direction, and the first direction is perpendicular to the length direction of the extrusion head body; Wherein, the first liquid inlet hole and the first liquid outlet hole are communicated with the main containing cavity.

6. The coating extrusion head according to claim 5, characterized in that: The extrusion head body is provided with a second liquid inlet hole and a second liquid outlet hole which are in communication with the buffer cavity; The second liquid inlet hole is used for supplying cleaning liquid into the buffer cavity, and the second liquid outlet hole is used for supplying cleaning liquid out of the buffer cavity.

7. The coating extrusion head according to claim 5, characterized in that: The extrusion head body comprises a first extrusion die and a second extrusion die stacked along a second direction; Along the second direction, the first extrusion mold has a first side surface facing the second extrusion die, and the first side surface is provided with a first groove extending along the length direction of the extrusion head body. The second extrusion die and the first groove together form the first accommodating cavity, and the first direction, the second direction, and the length direction of the extrusion head body are perpendicular to each other.

8. The coating extrusion head according to claim 7, characterized in that: The extrusion head body further comprises a first gasket, and along the second direction, the first gasket is arranged between the first extrusion die and the second extrusion die; Wherein, the first gasket has a first hollow area, and the main accommodating cavity and the buffer cavity are connected through the first hollow area.

9. The coating extrusion head according to claim 7, characterized in that: A second accommodating cavity for accommodating a second coating slurry is provided inside the extrusion head body, the first accommodating cavity and the second accommodating cavity are arranged along a second direction, and the extrusion head body is provided with a third liquid inlet and a third liquid outlet communicating with the second accommodating cavity; The third liquid inlet hole is used for supplying cleaning liquid into the second containing chamber, and the third liquid outlet hole is used for supplying cleaning liquid out of the second containing chamber.

10. The coating extrusion head according to claim 9, characterized in that: The extrusion head body further comprises a third extrusion die, and along the third direction, the second extrusion die and the third extrusion die are stacked; Along the third direction, the second extrusion die has a second side surface facing the third extrusion die, and the second side surface is provided with a second groove extending along the length direction of the extrusion head body. The third extrusion die and the second groove together form the second accommodating cavity. The third direction forms an angle with the second direction, and the third direction is perpendicular to the length direction of the extrusion head body.

11. A coating device, characterized in that: include: The coating extrusion head according to any one of claims 1 to 10.

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