Coating control system

Abstract

The utility model belongs to the technical field of battery production, and discloses a coating control system which comprises a coating die head and a feeding assembly, a plurality of coating channel groups are arranged on the coating die head at intervals, and each coating channel group comprises at least two coating channels; the feeding assembly comprises a storage tank and a plurality of screw pumps, the storage tank is used for providing ceramic slurry for the coating channels, each coating channel set is correspondingly provided with one screw pump, and the storage tank communicates with the coating channels through the screw pumps. According to the coating control system disclosed by the utility model, the plurality of screw pumps are arranged, so that each coating channel group is controlled by one independent screw pump, and the stability of flow velocity, pressure and the like of ceramic slurry in the coating channel of each coating channel group is effectively ensured, so that the coating quality of the ceramic slurry in each coating channel group is improved, and the production quality of a pole piece is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a coating control system. Background Art

[0002] With the continuous popularization of the application of lithium batteries, the requirements for lithium batteries are also getting higher and higher. On the premise of ensuring good safety, cycle life and rate performance, the demand for lithium batteries with continuously reduced production costs and improved production efficiency is becoming more and more urgent.

[0003] In the production process of lithium-ion batteries, the coating process is an important production process and has become the most important step in determining the initial form of the surface of the electrode sheet in the electrode sheet production link. At present, in the process of producing battery electrode sheets, a layer of ceramic slurry needs to be coated on the edge of the battery electrode sheet, so as to reduce the self-discharge rate of the battery electrode sheet. However, the existing electrode sheet production is usually single-width production, that is, a strip of positive electrode slurry is coated on the foil, and then ceramic slurry is coated on the edge of the strip of positive electrode slurry.

[0004] To improve the production efficiency of battery electrode sheets, the current electrode sheet production process can form multiple strips of positive electrode slurry on the foil at one time, then coat ceramic slurry on the edge of each strip of positive electrode slurry, and finally cut the foil into multiple electrode sheets with ceramic slurry and ceramic slurry on the edge of the ceramic slurry. The existing technology has the following defects: the existing ceramic slurry coating system can only coat ceramics on both sides of a single strip of positive electrode slurry. When coating ceramic slurry on multiple strips of positive electrode slurry, multiple operations are required, and the ceramic slurry coating efficiency is low, resulting in low production efficiency of battery electrode sheets. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a coating control system, which has a simple structure and can realize synchronous coating of multiple strips of ceramic slurry, with high production efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Provide a coating control system, including a coating die head and a feeding component. The coating die head is used for ceramic edge coating on multiple strips of coating materials on the foil. Multiple groups of coating channel groups are arranged at intervals on the coating die head, and each group of coating channel groups includes at least two coating channels. The feeding component includes a storage tank and multiple screw pumps. The storage tank is used to provide ceramic slurry to the coating channels. One screw pump is correspondingly arranged for each group of coating channel groups, and the storage tank is communicated with the coating channels through the screw pumps.

[0008] As a preferred solution of the coating control system, the feeding assembly further includes a first connecting pipe, a second connecting pipe and a feeding valve. One first connecting pipe is correspondingly arranged for each group of the coating channel groups. One end of the first connecting pipe is connected to the storage tank, the screw pump is arranged on the first connecting pipe, the other end of the first connecting pipe is connected with a plurality of the second connecting pipes, each second connecting pipe is correspondingly connected to a coating channel, and the feeding valve is respectively arranged on each second connecting pipe.

[0009] As a preferred solution of the coating control system, the coating die head is used for ceramic edge coating on multiple coating materials on the foil. Multiple coating materials are arranged at intervals along a first direction on the foil. One coating channel is correspondingly arranged on each side of each coating material along the first direction. Each group of the coating channel groups includes two coating channels, and at least two coating channels between at least two adjacent coating materials are the same group of the coating channel groups.

[0010] As a preferred solution of the coating control system, the two outermost coating channels of the coating die head along the first direction are the same group of the coating channel groups.

[0011] As a preferred solution of the coating control system, the feeding valve is an automatic control valve. The feeding assembly further includes a manual valve. The manual valve is arranged on the second connecting pipe and located between the feeding valve and the first connecting pipe.

[0012] As a preferred solution of the coating control system, the coating control system further includes a reflux assembly. The reflux assembly includes a third connecting pipe and a reflux valve. One end of the third connecting pipe is connected to the storage tank, the other end of the third connecting pipe is connected to the second connecting pipe and the connection point is located between the feeding valve and the first connecting pipe, and the reflux valve is arranged on the third connecting pipe.

[0013] As a preferred solution of the coating control system, the reflux assembly further includes a diaphragm valve for adjusting the flow rate of the third connecting pipe. The diaphragm valve is arranged on the third connecting pipe and located between the reflux valve and the storage tank.

[0014] As a preferred solution of the coating control system, the coating control system further includes a stop valve. The stop valve is arranged on the third connecting pipe and located between the diaphragm valve and the storage tank.

[0015] As a preferred solution of the coating control system, the coating control system further includes a temperature control machine, which is arranged at intervals on one side of the storage tank. The storage tank includes an inner cavity and an outer cavity arranged around the periphery of the inner cavity. The inner cavity is used to store the ceramic slurry, the outer cavity is arranged at intervals with the inner cavity, and a heat exchange medium is arranged in the outer cavity, and the heat exchange medium can exchange heat with the temperature control machine.

[0016] As a preferred solution of the coating control system, the coating control system further includes a detection component. The detection component includes a temperature sensor, which is arranged in the storage tank, and the temperature sensor is electrically connected to the temperature control machine; and / or, the detection component includes a pressure sensor, and the screw pump and the pressure sensor are arranged in sequence along the conveying direction of the ceramic slurry.

[0017] As a preferred solution of the coating control system, the coating control system further includes a filter, and the filter and the screw pump are arranged in sequence along the conveying direction of the ceramic slurry; and / or, the coating control system further includes a stirring component, and the stirring component includes a driving member and a stirring member. The stirring member is arranged in the storage tank, and at least part of the stirring member extends outside the storage tank and is connected to the driving member.

[0018] The beneficial effects of the present utility model: By arranging multiple groups of coating channel groups on the coating die head, it is possible to realize the synchronous coating of multiple groups of ceramic slurries during the production of electrode sheets with multiple-width positive electrode slurries, effectively improving the coating efficiency of the ceramic slurry, thereby improving the production efficiency of the electrode sheets and their batteries; by arranging multiple screw pumps, each group of coating channel groups is controlled by an independent screw pump, effectively ensuring the stability of the flow rate, pressure, etc. of the ceramic slurry in the coating channels of each coating channel group, thereby improving the coating quality of the ceramic slurry in each coating channel group and ensuring the production quality of the electrode sheets. Description of the Drawings

[0019] The following further describes the present utility model in detail according to the drawings and embodiments.

[0020] Figure 1 is a connection schematic diagram of the coating control system according to an embodiment of the present utility model;

[0021] Figure 2 is a control schematic diagram of the coating control system according to an embodiment of the present utility model;

[0022] Figure 3 is a structural schematic diagram of a battery electrode sheet according to an embodiment of the present utility model;

[0023] In the figure:

[0024] 100, foil; 101, coating material; 102, ceramic coating edge

[0025] 1. Coating die head; 11. Coating channel group; 111. Coating channel; 2. Feeding assembly; 21. Storage tank; 22. Screw pump; 23. First connecting pipe; 24. Second connecting pipe; 25. Feed valve; 26. Manual valve; 3. Return flow assembly; 31. Third connecting pipe; 32. Return flow valve; 33. Diaphragm valve; 34. Globe valve; 4. Temperature control machine; 5. Detection assembly; 51. Temperature sensor; 52. Pressure sensor; 6. Filter; 7. Stirring assembly; 71. Driving part; 72. Stirring part; 9. Controller; 10. Air source. Detailed implementation mode

[0026] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0027] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0030] As Figure 1 , Figure 2 and Figure 3 shown, the coating control system of the embodiment of the present utility model includes a coating die head 1 and a feeding assembly 2. The coating die head 1 is used to perform ceramic edge coating 102 on multiple coating materials 101 on the foil 100. Multiple groups of coating channel groups 11 are arranged at intervals on the coating die head 1, and each group of coating channel groups 11 includes at least two coating channels 111; the feeding assembly 2 includes a storage tank 21 and multiple screw pumps 22. The storage tank 21 is used to provide ceramic slurry to the coating channels 111. One screw pump 22 is correspondingly arranged for each group of coating channel groups 11, and the storage tank 21 is communicated with the coating channels 111 through the screw pumps 22.

[0031] It can be understood that by arranging multiple groups of coating channel groups 11 on the coating die head 1, synchronous coating of multiple groups of ceramic slurries can be achieved during the production of multiple-width positive electrode slurries on the pole piece, effectively improving the coating efficiency of the ceramic slurry, and thus improving the production efficiency of the pole piece and its battery. Compared with using one screw pump 22 to control all coating channels, the thickness of the ceramic slurry coating may be uneven due to reasons such as different lengths of each coating pipeline. That is, if the thickness of the ceramic slurry is too thin, the foil 100 is likely to be exposed, or if the thickness of the ceramic slurry is too thick, it may cause coating sticking to the roller or ceramic cracking during the roller pressing process. By arranging multiple screw pumps 22, each group of coating channel groups 11 is controlled by an independent screw pump 22, effectively ensuring the stability of the flow rate, pressure, etc. of the ceramic slurry in the coating channels 111 of each group of coating channel groups 11, thereby improving the coating quality of the ceramic slurry in each group of coating channel groups 11 and ensuring the production quality of the pole piece.

[0032] Furthermore, as Figure 1 shown, the feeding assembly 2 further includes a first connecting pipe 23, a second connecting pipe 24, and a feeding valve 25. One first connecting pipe 23 is correspondingly arranged for each group of coating channel groups 11. One end of the first connecting pipe 23 is connected to the storage tank 21, the screw pump 22 is arranged on the first connecting pipe 23, the other end of the first connecting pipe 23 is connected with multiple second connecting pipes 24, each second connecting pipe 24 is correspondingly connected to a coating channel 111, and a feeding valve 25 is respectively arranged on each second connecting pipe 24. Drive the screw pump 22 so that the ceramic slurry stored in the storage tank 21 can be transmitted to the second connecting pipe 24 through the first connecting pipe 23. When the feeding valve 25 is opened, the ceramic slurry in the second connecting pipe 24 can be sprayed onto the foil 100 through the coating channel 111. Multiple first connecting pipes 23 are arranged side by side and are independent of each other, reducing the influence between each group of coating channel groups 11.

[0033] Even further, as Figure 1 and Figure 3As shown, the coating die head 1 is used for ceramic edge coating of multiple coating materials 101 on the foil 100. Multiple coating materials 101 are arranged at intervals along the first direction on the foil 100 (the first direction is the X direction shown in the figure). On both sides of each coating material 101 along the first direction, there is a coating channel 111 corresponding respectively. Each set of coating channel groups 11 includes two coating channels 111. At least two coating channels 111 between adjacent two coating materials 101 are the same set of coating channel groups 11. The gap between adjacent two coating materials 101 on the foil 100 is short. To reduce the spraying difference of the ceramic slurries between adjacent two coating materials 101, by setting the two coating channels 111 between adjacent two coating materials 101 as the same set of coating channel groups 11 and controlling them with the same screw pump 22, the consistency of the ceramic edge coatings 102 formed by the ceramic slurries sprayed on adjacent two coating materials 101 can be effectively improved, and the deviation of the ceramic edge coatings 102 formed by the ceramic slurries sprayed on adjacent two coating materials 101 can be reduced.

[0034] Preferably, the two outermost coating channels 111 of the coating die head 1 along the first direction are the same set of coating channel groups 11. Among the two outermost coating materials 101 arranged at intervals along the first direction on the foil 100, the coating channel 111 close to the outside of the foil 100 is relatively independent. By setting the two outermost coating channels 111 of the coating die head 1 along the first direction as the same set of coating channel groups 11 and driving and spraying them with the same screw pump 22, it has high independence and can reduce the number of screw pumps 22 used, thus reducing the equipment investment cost. Of course, it is also possible to control the two outermost coating channels 111 of the coating die head 1 along the first direction respectively through a screw pump 22. In addition, the coating channel groups 11 can also be 2, 3 or more coating channels 111 arranged at intervals in sequence along the first direction.

[0035] Optionally, as Figure 1 shown and Figure 2 , the feed valve 25 is an automatic control valve. The feeding assembly 2 further includes a manual valve 26. The manual valve 26 is arranged on the second connecting pipe 24 and is located between the feed valve 25 and the first connecting pipe 23. That is, the feed valve 25 can only control the flow or closing of the second connecting pipe 24. However, in actual production, due to reasons such as production tolerances of the sizes of the coating channels 111 or deviations of the screw pumps 22, by arranging the manual valve 26 on the second connecting pipe 24 and between the feed valve 25 and the first connecting pipe 23, the flow rate of the ceramic slurry in the second connecting pipe 24 can be manually adjusted, so as to ensure the flow rate consistency of each second connecting pipe 24 and the coating channels 111, and improve the spraying stability of the ceramic slurry of the coating die head 1.

[0036] In some embodiments, the coating control system further includes a reflux assembly 3. The reflux assembly 3 includes a third connecting pipe 31 and a reflux valve 32. One end of the third connecting pipe 31 is connected to the storage tank 21, and the other end of the third connecting pipe 31 is connected to the second connecting pipe 24, and the connection point is located between the feed valve 25 and the first connecting pipe 23. A reflux valve 32 is provided on the third connecting pipe 31. When switching the foil 100 or performing other operation processes and it is necessary to stop the ceramic slurry coating of the coating die head 1, by opening the reflux valve 32 and closing the feed valve 25, the ceramic slurry in the first connecting pipe 23 is kept flowing. That is, the ceramic slurry flowing out of the storage tank 21 flows from the first connecting pipe 23 to the second connecting pipe 24, and then returns to the storage tank 21 through the third connecting pipe 31. This structural setting facilitates improving the startup efficiency when the coating die head 1 is started again. When the coating die head 1 is normally coating, the reflux valve 32 is closed and the feed valve 25 is opened.

[0037] Furthermore, the reflux assembly 3 further includes a diaphragm valve 33. The diaphragm valve 33 is provided on the third connecting pipe 31 and is located between the reflux valve 32 and the storage tank 21. The diaphragm valve 33 can adjust the flow rate of the third connecting pipe 31. When the coating die head 1 stops coating the ceramic slurry and the ceramic slurry is refluxed, by using the regulation of the diaphragm valve 33, the flow pressure of the ceramic slurry in the first connecting pipe 23 is within a preset value. This preset value is slightly greater than the pressure for the coating die head 1 to normally spray the ceramic slurry, which can reduce the risk that when the reflux valve 32 closes and the feed valve 25 is restarted, due to insufficient pressure of the ceramic slurry, the time required for the ceramic slurry to flow out of the coating die head 1 is too long, resulting in the waste of some of the foil 100 that has flowed during the time when the ceramic slurry flows out of the coating die head 1 and has not been coated with the ceramic slurry.

[0038] Further, the diaphragm valve 33 is currently in communication with the storage tank 21, and the storage tank 21 is in communication with the external atmosphere through a breather valve, resulting in a pressure drop or even zero pressure at the diaphragm valve 33. At this time, the feed valve 25 is closed, and the reflux valve 32 and the diaphragm valve 33 are opened. It is necessary to wait for the pressure at the diaphragm valve 33 to slowly rise until the preset pressure is reached for reflux. The coating control system further includes a stop valve 34, and the stop valve 34 is provided on the third connecting pipe 31 and located between the diaphragm valve 33 and the storage tank 21. That is, the diaphragm valve 33 is arranged between the stop valve 34 and the reflux valve 32. When the feed valve 25 is opened and the stop valve 34, the diaphragm valve 33 and the reflux valve 32 are simultaneously closed, the pressure at the diaphragm valve 33 is ensured, and the pipeline pressure at the diaphragm valve 33 during a short-term shutdown and restart of the coating reflux will not decrease, reducing the pressure accumulation time when the diaphragm valve 33 is restarted again. That is, when the stop valve 34, the diaphragm valve 33 and the reflux valve 32 are simultaneously opened and the feed valve 25 is closed, the ceramic slurry flowing out of the storage tank 21 flows from the first connecting pipe 23 to the second connecting pipe 24, and then returns to the storage tank 21 through the third connecting pipe 31. The pressure of the ceramic slurry in the first connecting pipe 23 and the second connecting pipe 24 is the preset pressure. When the feed valve 25 is opened again and the stop valve 34, the diaphragm valve 33 and the reflux valve 32 are simultaneously closed, the normal spraying of the coating die head 1 can be realized, avoiding the occurrence of poor coating start-up. It should be noted that the feed valve 25, the reflux valve 32 and the stop valve 34 are all pneumatic control valves in this embodiment and can be controlled by the same air source 10, only for opening and closing operations. The manual valve 26 and the diaphragm valve 33 are regulating valves and can adjust the flow rate of the ceramic slurry in the pipeline.

[0039] In other embodiments, such as Figure 1 shown and Figure 2 , the coating control system further includes a temperature control machine 4. The temperature control machine 4 is arranged at intervals on one side of the storage tank 21. The storage tank 21 is provided with an inner cavity and an outer cavity surrounding the periphery of the inner cavity. The inner cavity is used to store the ceramic slurry. The outer cavity is arranged at intervals with the inner cavity, and a heat exchange medium is arranged in the outer cavity. The heat exchange medium can exchange heat with the temperature control machine 4. In this embodiment, the heat exchange medium is circulating water. The circulating water in the temperature control machine 4 flows into the outer cavity, and the circulating water in the outer cavity contacts the cavity wall between the inner cavity and the outer cavity to realize heat exchange with the ceramic slurry in the inner cavity. The circulating water after heat exchange then flows back to the temperature control machine 4 for temperature treatment, effectively ensuring the temperature condition of the ceramic slurry and thus ensuring the spraying quality of the ceramic slurry.

[0040] Furthermore, the coating control system further includes a detection component 5. The detection component 5 includes a temperature sensor 51. The temperature sensor 51 is disposed in the storage tank 21 and is electrically connected to the temperature control machine 4. By monitoring the temperature of the ceramic slurry in the inner cavity in real time through the temperature sensor 51, the feedback controller 9 is used to control the temperature control machine 4 to adjust the temperature of the circulating water, effectively improving the temperature control accuracy of the ceramic slurry in the inner cavity. Of course, in addition to circulating water, the heat exchange medium flowing through the temperature control machine 4 can also be gas or other liquid cooling gases, etc. When the temperature sensor 51 senses that the temperature of the ceramic slurry in the inner cavity is lower than the preset value, the temperature control machine 4 is fed back to heat up the circulating water. If the temperature sensor 51 senses that the temperature of the ceramic slurry in the inner cavity is higher than the preset value, the temperature control machine 4 is fed back to cool down the circulating water.

[0041] In addition, the detection component 5 further includes a pressure sensor 52. The screw pump 22 and the pressure sensor 52 are arranged in sequence along the conveying direction of the ceramic slurry, that is, the pressure sensor 52 is used to detect the pressure in the first connecting pipe 23 to ensure that the pressure of the ceramic slurry in the first connecting pipe 23 reaches the preset pressure and improve the starting coating effect of the coating die head 1. It can be understood that the pressure sensor 52 is electrically connected to the diaphragm valve 33, and the opening size of the diaphragm valve 33 is adjusted in real time by detecting the pressure of the ceramic slurry in the first connecting pipe 23.

[0042] Furthermore, the coating control system further includes a filter 6. The filter 6 and the screw pump 22 are arranged in sequence along the conveying direction of the ceramic slurry, that is, the filter 6 is disposed on the first connecting pipe 23. By providing the filter 6, large particles and impurities in the ceramic slurry are filtered out to ensure the spraying effect of the ceramic slurry of the coating die head 1. Preferably, the filter 6 is a filter net, and the filter net is detachably connected to the inside of the first connecting pipe 23.

[0043] Of course, the coating control system further includes a stirring component 7. The stirring component 7 includes a driving member 71 and a stirring member 72. The stirring member 72 is disposed in the storage tank 21, and at least part of the stirring member 72 extends outside the storage tank 21 and is connected to the driving member 71. The stirring member 72 can be a stirring shaft and spiral blades arranged on the periphery of the stirring shaft. The driving member 71 is a motor. The motor is disposed outside the storage tank 21. The motor drives the stirring shaft to drive the spiral blades to rotate, so as to keep the ceramic slurry in the storage tank 21 in a stirred and mixed state and ensure the mixing uniformity of the ceramic slurry.

[0044] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A coating control system, characterized in that: include: A coating die head, the coating die head is used to apply ceramic coating to multiple coating materials on the foil, the coating die head is provided with multiple groups of coating channel groups at intervals, and each group of the coating channel groups includes at least two coating channels; A material supply assembly, the material supply assembly includes a storage tank and a plurality of screw pumps, the storage tank is used to provide ceramic slurry to the coating channel, each group of the coating channel groups is correspondingly provided with a screw pump, and the storage tank is connected to the coating channel through the screw pump.

2. The coating control system according to claim 1, characterized in that: The feeding assembly also includes a first connecting pipe, a second connecting pipe and a feed valve. Each group of the coating channel groups is correspondingly provided with a first connecting pipe, one end of the first connecting pipe is connected to the storage tank, the screw pump is arranged on the first connecting pipe, and the other end of the first connecting pipe is connected to multiple second connecting pipes, each of the second connecting pipes is correspondingly connected to a coating channel, and each of the second connecting pipes is respectively provided with the feed valve.

3. The coating control system according to claim 2, characterized in that: A plurality of coating materials are arranged on the foil material at intervals along the first direction, and each coating material corresponds to a coating channel on both sides along the first direction, each coating channel group includes two coating channels, and at least the two coating channels between two adjacent coating materials belong to the same coating channel group.

4. The coating control system according to claim 3, characterized in that: The two outermost coating channels of the coating die head along the first direction are the same coating channel group.

5. The coating control system according to claim 2, characterized in that: The feed valve is an automatic control valve, and the feed assembly further comprises a manual valve, which is arranged on the second connecting pipe and located between the feed valve and the first connecting pipe.

6. The coating control system according to any one of claims 2 to 5, characterized in that: It also includes a reflux component, which includes a third connecting pipe and a reflux valve. One end of the third connecting pipe is connected to the storage tank, and the other end of the third connecting pipe is connected to the second connecting pipe and the connection point is located between the feed valve and the first connecting pipe. The reflux valve is arranged on the third connecting pipe.

7. The coating control system according to claim 6, characterized in that: The reflux assembly also includes a diaphragm valve for adjusting the flow rate of the third connecting pipe. The diaphragm valve is arranged on the third connecting pipe and is located between the reflux valve and the storage tank.

8. The coating control system according to claim 7, characterized in that: It also includes a stop valve, which is arranged on the third connecting pipe and located between the diaphragm valve and the storage tank.

9. The coating control system according to any one of claims 1 to 5, characterized in that: It also includes a temperature controller, which is spaced apart on one side of the storage tank. The storage tank includes an inner cavity and an outer cavity arranged around the inner cavity. The inner cavity is used to store the ceramic slurry. The outer cavity is spaced apart from the inner cavity, and a heat exchange medium is arranged in the outer cavity. The heat exchange medium can exchange heat with the temperature controller.

10. The coating control system according to claim 9, characterized in that: It also includes a detection component, the detection component includes a temperature sensor, the temperature sensor is arranged in the storage tank, and the temperature sensor is electrically connected to the temperature control machine; and / or, The detection component includes a pressure sensor, and the screw pump and the pressure sensor are arranged in sequence along the conveying direction of the ceramic slurry.

11. The coating control system according to any one of claims 1 to 5, characterized in that: It also includes a filter, wherein the filter and the screw pump are sequentially arranged along the conveying direction of the ceramic slurry; and / or, It also includes a stirring component, which includes a driving member and a stirring member. The stirring member is arranged in the storage tank, and the stirring member at least partially extends outside the storage tank and is connected to the driving member.

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