Coating die head and coating device

Abstract

The utility model discloses a coating die head and a coating device.The coating die head comprises a first die head body, a second die head body and a cavity defined by the first die head body and the second die head body and having a preset extension length, and a discharging slit communicating the interior and the exterior of the cavity is formed in the connecting position of the first die head body and the second die head body; the cavity is formed in the middle area, deviating from the coating working direction, of the coating die head and is communicated with the cavity; the second feeding opening is formed in the first end and / or the second end of the two ends of the coating die head in the coating direction and communicates with the cavity; and the discharge hole is formed in the third direction of the coating die head and is communicated with the cavity. According to the scheme disclosed by the invention, the coating die head is provided with the first feed port, the second feed port and the discharge port, so that materials can enter the cavity from the first feed port, can also enter the cavity from the second feed port, and then flow out of the discharge port after being scoured in the cavity, so that slurry in all areas in the cavity participates in die head circulation, and the coating efficiency is improved. And the slurry is prevented from being deposited at corners in the cavity.

Description

Technical Field

[0001] This disclosure generally relates to the field of battery manufacturing technology. More specifically, this disclosure relates to a coating die, and further, this disclosure also relates to a coating apparatus. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In battery manufacturing, extrusion coating is one of the core processes, renowned for its high-precision coating capabilities. The coating die is a key component of this technology, consisting of upper and lower parts with a fine slit in the middle. This design ensures that, under precise pressure control, the slurry can be uniformly extruded from the slit and coated onto the substrate.

[0004] Currently, the feed inlet on most coating dies is located in the central region, from which the slurry flows into the cavity and diffuses to both sides. However, due to the principles of fluid dynamics, the slurry flow rate slows down at the edges, which can cause slurry to accumulate in corners. Furthermore, if the coating machine is not used for extended periods or is not cleaned promptly after shutdown, slurry will accumulate inside the die, forming deposits. These deposited slurry deposits can severely affect the uniformity of the coating during the coating process, potentially leading to appearance defects such as streaks and spots, thus reducing the overall appearance quality of the coated product. In addition, variations in coating thickness and uneven distribution can negatively impact key performance characteristics of the battery, such as energy density and cycle life. More critically, coating inhomogeneity can also affect the consistency of the cells, leading to increased performance differences between cells and ultimately affecting the overall performance of the entire battery pack.

[0005] To address this issue, coating dies need to be cleaned periodically after a period of use. However, this cleaning process is not only time-consuming and affects production efficiency, but the slurry removed also results in a waste of production materials.

[0006] In view of this, there is an urgent need to provide a solution for a coating die head and coating device in order to improve the cleaning efficiency of the die head and reduce material waste. Utility Model Content

[0007] In order to at least solve the technical problems mentioned above, this disclosure proposes a coating die head and coating device that can conveniently and efficiently clean the die head.

[0008] In a first aspect, this disclosure provides a coating die head, including a first die head and a second die head, the first die head and the second die head forming a cavity with a predetermined extension length, the coating die head having a discharge slit communicating with the inside and outside of the cavity, wherein the discharge slit faces the coating working direction of the coating die head, the coating die head further includes: a first inlet, opened in the middle region of the first die head and / or the second die head away from the coating working direction, and communicating with the cavity; a second inlet, opened at a first end and / or a second end in the transverse direction of the coating working direction of the first die head and / or the second die head, and communicating with the cavity; and an outlet, the outlet being located on a third-party direction of the coating die head, the third-party direction being a direction different from the coating working direction and the transverse direction of the coating working direction, and communicating with the cavity.

[0009] In some embodiments, the feeding direction of the first feed inlet is parallel to the discharge direction of the discharge slit.

[0010] In some embodiments, a plurality of second feed ports are respectively disposed on the end faces of the first end and the second end in the transverse direction of the coating working direction, such that the feeding direction of the second feed ports is perpendicular to the discharge direction of the discharge slit.

[0011] In some embodiments, the discharge port is located on the first die head, and the discharge direction of the discharge port is perpendicular to the feeding direction of both the first feed port and the second feed port.

[0012] In some embodiments, in the transverse direction of the coating working direction, the discharge port is located in the area between the first feed port and the second feed port.

[0013] In some embodiments, in the coating working direction, the cavity includes at least a first cavity and a second cavity that are interconnected; the first cavity and the second cavity are respectively connected to their respective second feed ports.

[0014] In a second aspect, this disclosure provides a coating apparatus comprising the coating die described above.

[0015] In some embodiments, the coating apparatus further includes a main feed line configured to selectively communicate with the first feed port and the second feed port.

[0016] In some embodiments, the coating apparatus further includes: a first sub-pipeline connected to the first feed inlet; a second sub-pipeline connected to the second feed inlet; and a three-way valve, the three-way valve including a first valve outlet, a second valve outlet, and a valve inlet, the valve inlet being connected to the main feed pipeline, the first valve outlet being connected to the first sub-pipeline, the second valve outlet being connected to the second sub-pipeline, and the three-way valve being configured such that the valve inlet is selectively connected to either the first valve outlet or the second valve outlet.

[0017] In some embodiments, the second sub-pipeline includes at least a first branch pipe and a second branch pipe, wherein the first branch pipe is connected to the second inlet of the first cavity, and the second branch pipe is connected to the second inlet of the second cavity.

[0018] Using the coating die head provided above, this embodiment of the present disclosure provides a first feed inlet located in the middle region away from the coating working direction, a second feed inlet located at the first and / or second ends in the transverse direction of the coating working direction, and a discharge outlet located on the third-direction side of the coating die head. This design allows material to enter the cavity through two pathways during cleaning of the coating die head: entering through the first feed inlet, being flushed, and then flowing out through the discharge outlet; and entering through the second feed inlet, being flushed, and also flowing out through the discharge outlet. The advantage of this design is that it allows for thorough flushing of all corners of the cavity without disassembling the first die head, effectively preventing slurry deposition. This specially designed feed inlet allows for more effective cleaning of the die head's interior, maintaining its performance and precision. Furthermore, in some embodiments, by providing second feed inlets on both the first and second cavities, better cleaning of both cavities is achieved. Attached Figure Description

[0019] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0020] Figure 1 A schematic diagram of the coating die head according to an embodiment of this disclosure is shown;

[0021] Figure 2 A schematic diagram of a coating apparatus according to an embodiment of this disclosure is shown.

[0022] In the diagram: 100, coating die head; 200, coating device;

[0023] 101. First die head; 102. Second die head; 103. First cavity; 104. Second cavity; 105. Gasket; 106. Discharge slit; 107. First feed inlet; 108. Second feed inlet; 109. Discharge outlet;

[0024] 201. Main feed line; 202. First sub-pipeline; 203. Second sub-pipeline; 204. Three-way valve;

[0025] 2031, First Division in Charge; 2032, Second Division in Charge. Detailed Implementation

[0026] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0027] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0029] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrases "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0030] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0031] like Figure 1As shown, this disclosure provides a coating die 100. As illustrated, it can be an extrusion coating die. The coating die 100 includes a first die 101 and a second die 102 (also referred to as an upper die and a lower die, respectively). The first die 101 and the second die 102 form a cavity with a predetermined extension length, and their connection is sealed by a gasket. The coating die 100 has a discharge slit 106 communicating with the inside and outside of the cavity on one side of the coating working direction. The coating die 100 also includes a first feed port 107 on the side opposite to the coating working direction. The first feed port 107 is located in the middle region of the second die 102 and communicates with the cavity. The second die head 102 is provided with a second inlet 108 communicating with the cavity at the first and / or second ends of both ends along the length direction (i.e., the transverse direction of the coating working direction); the first die head 101 is provided with an outlet 109 communicating with the cavity, wherein the outlet 109 is used for the return of slurry.

[0032] Specifically, the first die head 101 and the second die head 102 in this solution have a preset extension length. The first die head 101 and the second die head 102 abut against each other and form a cavity with a preset extension length. A portion of the connection between the two is provided with a gasket 105 of a preset thickness. The area without the gasket 105 forms a discharge slit 106 that connects the inside and outside of the cavity. The discharge slit 106 extends along the length direction of the coating die head 100.

[0033] More specifically, the second die head 102 has a first feed port 107 communicating with the cavity in the middle region away from the coating working direction, and a second feed port 108 communicating with the cavity is opened at the first or second end in the length direction of the second die head 102. In addition, a discharge port 109 communicating with the cavity is also opened on the third-direction side of the first die head 101.

[0034] It is worth noting that, referring to the coating die head shown in the attached figure, the transverse direction of the coating working direction in this solution can refer to the length direction of the coating die head 100, the width direction of the coating die head, and the third direction can refer to the height direction of the coating die head 100.

[0035] In use, when the coating die 100 performs the coating operation, the discharge port 109 on the first die 101 can be closed or reduced as needed, and material can be fed into the cavity from the first feed port 107 on the second die 102. Then, the material flows out from the discharge slit 106 to perform the coating operation. To avoid material deposition at both ends of the coating die 100, the material can enter the cavity from both the first feed port 107 and the second feed port 108. Specifically, the feeding method can be simultaneous feeding from the first feed port 107 and the second feed port 108, or alternating feeding.

[0036] When the coating operation ends and the machine stops for die head circulation, a cleaning operation is performed on the coating die head 100. At this time, the outlet 109 of the first die head 101 is open, and the material can enter the cavity through two paths: entering the cavity through the first inlet 107, flushing the cavity, and the slurry carrying the sediment in the cavity flows out through the outlet 109; and entering the cavity through the second inlet 108 at the end of the second die head 102, flushing the cavity, and the slurry carrying the sediment in the cavity flows out through the outlet 109. In specific operation, the slurry can alternately be fed through the first inlet 107 for a preset time and through the second inlet 108 for a preset time, and then flow out through the outlet 109 of the first die head 101. This ensures that the slurry in all areas of the coating die head 100 participates in the die head circulation, preventing slurry from accumulating in the corners of the cavity. The preset time in this solution can be set according to requirements, for example, 5 minutes or 10 minutes.

[0037] The above scheme only describes the case where the second feed port 108 is only opened at the first end or the second end. Those skilled in the art will understand that in order to better enable all areas in the cavity to participate in the die head circulation, the second feed port 108 is provided at both the first end and the second end of the second die head 102.

[0038] The above scheme describes the case where both the first feed port 107 and the second feed port 108 are located on the second die head 102. Those skilled in the art will understand that in other embodiments, the first feed port 107 and the second feed port 108 can also be simultaneously located on the first die head 101, or separately located on the first die head 101 and the second die head 102. Furthermore, the coating die head can also have two first feed ports 107 and multiple second feed ports 108. Both first feed ports 107 can be located on either the first die head 101 or the second die head 102, or one can be located on the first die head 101 and the other on the second die head 102. Similarly, multiple second feed ports can be located on either the first die head 101 or the second die head 102, or some can be located on the first die head 101 and others on the second die head 102.

[0039] Those skilled in the art will understand that the first die 101 and the second die 102 can also be integrally formed structures, and the discharge slit 106 can be provided as a notch on the side wall of the first die 101, the second die 102, or the first die 101 and the second die 102. Furthermore, the coating die 100 formed by the first die 101 and the second die 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0040] In some implementations, the feeding direction of the first feed port 107 is parallel to the discharge direction of the discharge slit 106.

[0041] In this design, the first inlet 107 is located on the side wall of the second die head 102 on the opposite side of the outlet slit 106. That is, the feeding direction of the first inlet 107 is parallel to the discharge direction of the outlet slit 106. The location and feeding direction of the first inlet 107 can ensure that the electrode slurry can enter the die head system efficiently and uniformly, and maintain uniformity in the subsequent coating process, thereby improving the overall quality and performance of the battery product.

[0042] In some embodiments, a plurality of second feed ports 108 are respectively disposed on the end face of the first end and / or the second end in the transverse direction of the coating working direction, such that the feeding direction of the second feed port 108 is perpendicular to the discharge direction of the discharge slit 106.

[0043] In this design, the second inlet 108 is located on a different sidewall than the first inlet 107. The second inlet 108 is positioned on the end face of the second die head 102, perpendicular to and connected to the sidewall where the first inlet 107 is located. That is, the feeding direction of the second inlet 108 is perpendicular to the discharge direction of the discharge slit 106 and the feeding direction of the first inlet 107. Of course, when only one second inlet 108 is provided, it can be located on either the first or second end face. When two or more second inlets are provided, they can be evenly distributed on both the first and second end faces. In this design, because the feeding direction of the second inlet 108 is the same as the extension direction of the cavity, the slurry can flow directly along the shape of the cavity, reducing flow resistance caused by inconsistent directions and improving feeding efficiency.

[0044] Of course, in other embodiments, the second feed port 108 is also located on the side wall where the first feed port 107 is located, and the feeding direction is the same as that of the first feed port 107. In this solution, the second feed port 108 can still communicate with the end of the cavity, but the feeding direction is different from that in the above solution.

[0045] In some implementations, the discharge port 109 is located on the first die head 101, and the discharge direction of the discharge port 109 is perpendicular to the feeding direction of the first feed port 107 and the feeding direction of the second feed port 108.

[0046] In the above scheme, the discharge port 109 is located on the top wall of the first die head 101, and the discharge direction of the discharge port 109 is perpendicular to the feeding direction of the first feed port 107 and the feeding direction of the second feed port 108. (See attached diagram.) Figure 1 The feeding direction of the first feed port 107 is the width direction of the coating die head, the feeding direction of the second feed port 108 is the length direction of the coating die head, and the discharge direction of the discharge port 109 is the height direction of the coating die head. Furthermore, the top wall of the first die head 101 mentioned in this design refers to the side wall that does not contact the second die head 102.

[0047] In some implementations, the discharge port 109 is located in the area between the first inlet port 107 and the second inlet port 108 in the transverse direction of the coating operation.

[0048] In the above scheme, the first die head 101 has two outlets 109 spaced apart along its length, and the second die head 102 has two second inlets 108. One outlet 109 is located in the area between the first inlet 107 and the second outlet 109, and the other outlet 109 is also located in the area between the first outlet 109 and the other second outlet 109. By setting two outlets 109 in this scheme, and placing both outlets 109 between the first inlet 107 and the second inlet 108, a path for the slurry in the cavity to flow out is provided, thereby achieving better die head circulation and cleaning.

[0049] Of course, those skilled in the art will understand that when only one discharge port 109 is provided and two second feed ports 108 are provided, the discharge port 109 can be located in the area between the first feed port 107 and any one of the second feed ports 108.

[0050] In some embodiments, in the coating working direction, the cavity includes at least a first cavity 103 and a second cavity 104 that are interconnected; the first cavity 103 and the second cavity 104 are respectively connected to their respective second feed ports 108.

[0051] The coating die 100 in the above scheme is not just provided with one cavity, but with two interconnected first cavities 103 and second cavities 104 in the coating working direction. In order to ensure that the slurry in all cavities of the coating die 100 participates in the die circulation, the end faces of the two cavities are respectively provided with second feed ports 108 communicating with them. That is to say, in this scheme, the first cavity 103 is provided with two second feed ports 108 in the transverse direction of the coating working direction, and the second cavity 104 is also provided with two second feed ports 108 in the transverse direction of the coating working direction.

[0052] Those skilled in the art will understand that since the two chambers are interconnected, when the slurry in one chamber reaches a preset amount, it will flow from one chamber into the other. Therefore, it is possible to achieve the purpose of cleaning the two chambers by simply setting two second feed ports 108 at both ends of the first chamber 103 or the second chamber 104.

[0053] The coating die head 100 disclosed herein, through the design of the second inlet 108 and the outlet 109, enables the slurry in all areas of the cavity to participate in the die head circulation without opening the cavity, preventing slurry from accumulating in the corners of the cavity. This solution is not only simple to operate, but also improves the cleaning efficiency of the die head.

[0054] In some embodiments, this disclosure also provides a coating apparatus 200, which includes the coating die head 100 described above.

[0055] like Figure 2 As shown, in one specific embodiment, the coating apparatus 200 further includes a main feed line 201 configured to selectively communicate with the first feed port 107 and the second feed port 108.

[0056] In this design, the coating die 100 is also connected to a main feed pipe 201, which is connected not only to the first feed port 107 but also to the second feed port 108. Furthermore, the main feed pipe 201 is equipped with two feed valves. By controlling the opening and closing of these valves, the main feed pipe can be connected to the first feed port 107 to allow material to enter the cavity from the first feed port 107, or connected to the second feed port 108 to allow material to enter the cavity from the second feed port 108. In this disclosed design, the main feed pipe 201 is selectively connected to either the first feed port 107 or the second feed port 108, allowing the slurry to alternately enter the cavity through both ports and then exit through the outlet 109. Additionally, a feed pump is connected to the main feed pipe, providing power for the slurry to enter the cavity. Because the slurry has a kinetic force after entering the cavity, this kinetic force keeps the slurry flowing in the cavity until it is finally discharged from the outlet 109.

[0057] Of course, those skilled in the art will understand that the main feed pipe 201 may not have a three-way valve, allowing it to connect to both the first feed port 107 and the second feed port 108. This arrangement allows material to enter the cavity simultaneously from both the first feed port 107 and the second feed port. Alternatively, instead of just one main feed pipe 201, two separate pipes can be provided, each connected to the first feed port 107 and the second feed port 108. This arrangement allows for both cyclic feeding from the two feed ports and simultaneous feeding from both ports.

[0058] In some embodiments, the coating apparatus 200 further includes: a first sub-pipeline 202 connected to the first feed inlet 107; a second sub-pipeline 203 connected to the second feed inlet 108; and a three-way valve 204, the three-way valve 204 including a first valve outlet, a second valve outlet, and a valve inlet, the valve inlet being connected to the main feed pipeline 201, the first valve outlet being connected to the first sub-pipeline 202, and the second valve outlet being connected to the second sub-pipeline 203, the three-way valve 204 being configured such that the valve inlet is selectively connected to either the first valve outlet or the second valve outlet.

[0059] In this design, the coating apparatus 200 includes a first sub-pipeline 202, a second sub-pipeline 203, and a three-way valve 204. Specifically, the first sub-pipeline 202 is connected to the first feed inlet 107, while the second sub-pipeline 203 is connected to the second feed inlet 108. The three-way valve 204 consists of three ports: a first valve outlet, a second valve outlet, and a valve inlet. Specifically, the valve inlet is connected to the main feed pipeline 201, the first valve outlet is connected to the first sub-pipeline 202, and the second valve outlet is connected to the second sub-pipeline 203. In use, when material needs to enter through the first feed inlet 107, the control valve inlet and the first valve outlet are in the open state, while the second valve outlet is in the closed state. Then, the material enters the main feed pipeline 201 under the action of the feed pump, passes through the first sub-pipeline 202, and enters the cavity. When material needs to enter through the second feed inlet 108, the control valve inlet and the second valve outlet are in the open state, while the first valve outlet is in the closed state. Then, under the action of the feed pump, the material enters the main feed pipe 201 and enters the cavity through the second sub-pipe 203.

[0060] Those skilled in the art will understand that when both ends of the coating die 100 are provided with a second feed port 108, the two second feed ports 108 can be connected through a second sub-pipeline 203, and then the outlet of the second valve on the three-way valve 204 can be connected to the second sub-pipeline 203 through a connecting pipe, thereby enabling the two feed ports to perform feeding operations simultaneously. Alternatively, if the two second feed ports 108 need to feed individually, this can be achieved by providing two valves on the second sub-pipeline 203.

[0061] This disclosure provides a solution that, by quickly switching the three-way valve 204 and connecting the first sub-pipe 202 or the second sub-pipe, can reduce the time required for replacing pipes or adjusting settings, thereby improving the cleaning efficiency of the coating die 100.

[0062] In some embodiments, the second sub-pipe 203 includes at least a first branch pipe 2031 and a second branch pipe 2032, wherein the first branch pipe 2031 is connected to the second inlet 108 of the first cavity 103, and the second branch pipe 2032 is connected to the second inlet 108 of the second cavity 104.

[0063] In the above scheme, the coating feeding device is specially designed with two branch pipes to accommodate the interconnected first cavity 103 and second cavity 104 on the coating die 100, both of which are connected to the second feed port 108. These are the first branch pipe 2031 and the second branch pipe 2032. Specifically, the first branch pipe 2031 is used to connect to the second feed port 108 on the first cavity 103, and the second branch pipe 2032 is used to connect to the second feed port 108 on the second cavity 104. This design ensures that both cavities can be connected to the second sub-pipeline 203 through their respective branch pipes.

[0064] The coating apparatus 200 disclosed herein can perform feeding operations more conveniently according to usage needs, thereby improving the user experience.

[0065] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A coating die head, comprising a first die head (101) and a second die head (102), the first die head (101) and the second die head (102) forming a cavity with a predetermined extension length, the coating die head having a discharge slit (106) communicating with the inside and outside of the cavity, wherein the discharge slit (106) is oriented in the coating working direction of the coating die head, characterized in that, The coating die head also includes: The first feed port (107) is located in the middle region of the first die head (101) and / or the second die head (102) away from the coating working direction, and is connected to the cavity; The second feed inlet (108) is located at a first end and / or a second end in the transverse direction of the coating working direction of the first die (101) and / or the second die (102), and communicates with the cavity; and The discharge port (109) is located on the side of the coating die head in a third direction. The third direction is a transverse direction that is different from the coating working direction and the coating working direction, and it is connected to the cavity.

2. The coating die head according to claim 1, characterized in that, The feeding direction of the first feed inlet (107) is parallel to the discharge direction of the discharge slit (106).

3. The coating die head according to claim 1 or 2, characterized in that, Multiple second feed ports (108) are respectively disposed on the end faces of the first and second ends in the transverse direction of the coating working direction, such that the feeding direction of the second feed port (108) is perpendicular to the discharge direction of the discharge slit (106).

4. The coating die head according to claim 3, characterized in that, The discharge port (109) is located on the first die head (101), and the discharge direction of the discharge port (109) is perpendicular to the feeding direction of the first feed port (107) and the feeding direction of the second feed port (108).

5. The coating die head according to claim 4, characterized in that, In the transverse direction of the coating operation, the discharge port (109) is located in the area between the first feed port (107) and the second feed port (108).

6. The coating die head according to claim 3, characterized in that, In the coating working direction, the cavity includes at least a first cavity (103) and a second cavity (104) that are interconnected; The first cavity (103) and the second cavity (104) are respectively connected to their respective second feed ports (108).

7. A coating apparatus, characterized in that, It includes the coating die head according to any one of claims 1-6.

8. The coating apparatus according to claim 7, characterized in that, The coating apparatus further includes a main feed line (201) configured to be selectively connected to the first feed port (107) and the second feed port (108).

9. The coating apparatus according to claim 8, characterized in that, The coating apparatus further includes: The first sub-pipeline (202) is connected to the first feed inlet (107); The second sub-pipeline (203) is connected to the second feed inlet (108); A three-way valve (204) includes a first valve outlet, a second valve outlet, and a valve inlet. The valve inlet is connected to the main feed pipeline (201), the first valve outlet is connected to the first sub-pipeline (202), and the second valve outlet is connected to the second sub-pipeline (203). The three-way valve (204) is configured such that the valve inlet is selectively connected to either the first valve outlet or the second valve outlet.

10. The coating apparatus according to claim 9, characterized in that, The second sub-pipeline (203) includes at least a first branch pipe (2031) and a second branch pipe (2032). The first branch pipe (2031) is connected to the second inlet (108) of the first cavity (103), and the second branch pipe (2032) is connected to the second inlet (108) of the second cavity (104).

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