Slurry bubble eliminating system

Abstract

The utility model relates to the technical field of battery production, and discloses a slurry bubble eliminating system which comprises a coating slurry tank, a vacuumizing defoaming tank, a material supplementing transfer tank and a backflow transfer tank. The coating slurry tank is used for containing slurry. The vacuumizing defoaming tank is provided with an extraction opening, an air inlet and a liquid outlet, and the extraction opening is connected with a vacuum pump. A first gas outlet, a first liquid inlet and a first liquid outlet are formed in the material supplementing transfer tank, the first gas outlet is communicated with the gas inlet, the first liquid outlet is communicated with the coating slurry tank, and the first liquid inlet is communicated with an external slurry supply pipe. The backflow transfer tank is provided with a second gas outlet, a second liquid inlet and a second liquid outlet, the second gas outlet is communicated with the gas inlet, the second liquid outlet is communicated with the coating slurry tank, and the second liquid inlet is communicated with the liquid outlet. The bubbles are transferred to the vacuum defoaming tank for defoaming, so that the efficiency is higher, the coating slurry tank does not need to be vacuumized, and the production cost is lower.

Description

Technical Field

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

[0002] During the coating process, such as the coating step of lithium battery diaphragm coating, the slurry needs to be coated on the base film, but bubbles will be generated during the use of the slurry. First, in order to prevent the slurry from sinking to the bottom, the slurry tank needs to be stirred continuously, and bubbles will be generated during the stirring process; second, in order to improve the utilization rate of the slurry, the slurry is recycled during the production process, and the slurry flows back to the slurry tank from the slurry reflux inlet. However, small bubbles will be introduced during the coating process of the gravure roller; third, in normal production, the slurry tank will be constantly replenished with slurry, and bubbles will also be introduced during the slurry input process. These bubbles cause more bright spots on the diaphragm during the slurry coating process, affecting product quality.

[0003] At present, the bubbles in the slurry need to be removed regularly, resulting in a slurry utilization rate of only 80%, which in turn leads to an increase in product costs. Therefore, it is particularly important to eliminate bubbles in the slurry. The prior art is to add a defoaming agent to the slurry or to perform static vacuum defoaming. The method of using a defoaming agent has disadvantages. When the amount of defoaming agent added is small, the defoaming ability is limited, and a large number of small bubbles cannot be eliminated, which cannot solve the existing problems. When the amount of defoaming agent added is large, it will affect the performance of the diaphragm. The static vacuum defoaming method is that the slurry tank is in a sealed state and connected to a vacuum pump. By vacuuming the slurry tank, the bubbles expand and burst. However, this solution has relatively high requirements for the sealing state of the slurry tank. First, the cost is high. Second, the slurry tank often needs to be opened for inspection. The tank body is relatively large and the defoaming effect is relatively poor.

[0004] Therefore, there is an urgent need for a slurry bubble elimination system to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a slurry bubble elimination system, which can not only eliminate bubbles in the slurry, but also has low production cost and high product quality.

[0006] As conceived above, the technical solution adopted by the utility model is:

[0007] A slurry bubble elimination system is provided, comprising:

[0008] A coating slurry tank, used for containing slurry;

[0009] A vacuum defoaming tank is provided with an air extraction port, an air inlet and a liquid outlet, and the air extraction port is connected to a vacuum pump;

[0010] A feed transfer tank is provided with a first gas outlet, a first liquid inlet and a first liquid outlet, wherein the first gas outlet is communicated with the gas inlet, the first liquid outlet is communicated with the coating slurry tank, and the first liquid inlet is communicated with an external slurry supply pipe;

[0011] The reflux transfer tank is provided with a second gas outlet, a second liquid inlet and a second liquid outlet, wherein the second gas outlet is connected to the gas inlet, the second liquid outlet is connected to the coating slurry tank, and the second liquid inlet is connected to the liquid outlet.

[0012] Optionally, the first liquid outlet is located at the bottom of the feed transfer tank;

[0013] The second liquid outlet is located at the bottom of the reflux transfer tank.

[0014] Optionally, the coating slurry tank is provided with a first port and a second port located below the liquid level in the coating slurry tank;

[0015] The first port is connected to the first liquid outlet through a first tube, and a first valve is provided on the first tube;

[0016] The second port is connected to the second liquid outlet through a second tube, and a second valve is arranged on the second tube.

[0017] Optionally, the second liquid inlet is connected to the liquid outlet through a third tube, a third valve is provided on the third tube, and the inner diameter of the third tube is D, 5mm<D<25mm.

[0018] Optionally, the first gas outlet and the second gas outlet are both connected to the gas inlet via a fourth pipe, a fourth valve is provided on the fourth pipe, and the fourth valve is used to control the communication between the first gas outlet, the second gas outlet and the gas inlet.

[0019] Optionally, ends of the fourth tube close to the first gas outlet and the second gas outlet are telescopic tubes, and extend into the interior of the feed transfer tank and the reflux transfer tank respectively.

[0020] Optionally, a third liquid inlet is further provided on the reflux transfer tank, and the third liquid inlet is connected to an external slurry reflux pipe.

[0021] Optionally, the third liquid inlet is located above the liquid level in the reflux transfer tank, and the second liquid outlet is located at the bottom of the reflux transfer tank.

[0022] Optionally, a first exhaust hole is provided on the feed transfer tank; and / or,

[0023] A second exhaust hole is arranged on the reflux transfer tank.

[0024] Optionally, an agitator is provided on the coating slurry tank, and a stirring paddle of the agitator is located below the liquid level in the coating slurry tank.

[0025] The beneficial effects of the utility model are:

[0026] The slurry bubble elimination system proposed in the utility model includes a coating slurry tank, a vacuum defoaming tank, a feeding transfer tank and a reflux transfer tank. The vacuum defoaming tank is provided with an air suction port, an air inlet and a liquid outlet, and the air suction port is connected to a vacuum pump, and the vacuum pump is used to make the vacuum defoaming tank in a negative pressure environment. The feeding transfer tank is provided with a first gas outlet, a first liquid inlet and a first liquid outlet, and the first liquid inlet is connected to an external slurry supply pipe. When the external slurry enters the feeding transfer tank, bubbles are easily generated. The first gas outlet is connected to the air inlet. Turning on the vacuum pump to vacuum the vacuum defoaming tank can make the bubbles in the feeding transfer tank overflow into the vacuum defoaming tank through the first gas outlet and the air inlet under the action of negative pressure. The bubbles gather in the vacuum defoaming tank and break under the influence of negative pressure to re-form slurry. The reflux transfer tank is provided with a second gas outlet, a second liquid inlet and a second liquid outlet, and the liquid outlet is connected to the second liquid inlet, so that the slurry formed by the bursting of bubbles in the vacuum defoaming tank can flow into the reflux transfer tank. If there is slurry flowing in the reflux transfer tank, bubbles are also easily generated in the reflux transfer tank. The second gas outlet is connected to the air inlet, and the vacuum pump is turned on to vacuum the vacuum defoaming tank, so that the bubbles in the reflux transfer tank can overflow into the vacuum defoaming tank through the second gas outlet and the air inlet under the action of negative pressure. The bubbles gather in the vacuum defoaming tank and burst under the influence of negative pressure to re-form slurry. The first liquid outlet and the second liquid outlet are both connected to the coating slurry tank, so that the slurry in the feeding transfer tank and the reflux transfer tank can flow into the coating slurry tank. The coating slurry tank is used to accommodate slurry, and the slurry in the coating slurry tank can be transported to the coating head. The slurry bubble elimination system transfers the bubbles to the vacuum defoaming tank for defoaming, which is more efficient and reduces the bubbles in the slurry supplied to the coating head, thereby ensuring the quality of the coated product. The bubbles are eliminated before entering the coating slurry tank, so there is no need to evacuate the coating slurry tank, thereby avoiding the increase in production costs caused by evacuating large tanks such as the coating slurry tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a slurry bubble elimination system provided in an embodiment of the utility model.

[0028] In the figure:

[0029] 1. Vacuum defoaming tank; 11. Air extraction port; 12. Air inlet; 13. Liquid outlet;

[0030] 2. Feed transfer tank; 21. First gas outlet; 22. First liquid inlet; 23. First liquid outlet; 24. First exhaust hole;

[0031] 3. Reflux transfer tank; 31. Second gas outlet; 32. Second liquid inlet; 33. Second liquid outlet; 34. Third liquid inlet; 35. Second exhaust hole;

[0032] 4. Coating slurry tank; 41. First port; 42. Second port; 43. Third port;

[0033] 5. Agitator; 51. Agitator;

[0034] 10. first pipe; 101. first valve;

[0035] 20. second pipe; 201. second valve;

[0036] 30. The third pipe; 301. The third valve;

[0037] 40, fourth pipe; 401, fourth valve;

[0038] 50, the fifth tube; 501, the fifth valve. DETAILED DESCRIPTION

[0039] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0044] like Figure 1 As shown, this embodiment provides a slurry bubble elimination system, including a coating slurry tank 4, a vacuum defoaming tank 1, a feed transfer tank 2 and a reflux transfer tank 3. The coating slurry tank 4 is used to accommodate slurry, the feed transfer tank 2 and the reflux transfer tank 3 are connected to the coating slurry tank 4, and the feed transfer tank 2 is connected to the external slurry supply pipe, that is, the slurry first passes through the feed transfer tank 2 before entering the coating slurry tank 4. The feed transfer tank 2 and the reflux transfer tank 3 are both connected to the vacuum defoaming tank 1, and the bubbles in the feed transfer tank 2 and the reflux transfer tank 3 can flow into the vacuum defoaming tank 1. The vacuum defoaming tank 1 is connected to a vacuum pump, and the vacuum pump evacuates air to expand and rupture the bubbles in the vacuum defoaming tank 1 and turn them into slurry again. The slurry then flows back from the vacuum defoaming tank 1 to the reflux transfer tank 3, and finally flows back to the coating slurry tank 4, and the slurry in the coating slurry tank 4 can be transported to the coating head. By transferring the bubbles to the vacuum defoaming tank 1 for defoaming, the efficiency is higher, and the bubbles are eliminated before entering the coating slurry tank 4, which can reduce the bubbles in the slurry supplied to the coating head and ensure product quality without vacuuming the coating slurry tank 4, and can also avoid the increase in production costs caused by vacuuming a large tank such as the coating slurry tank 4.

[0045] Specifically, the vacuum defoaming tank 1 is provided with an air suction port 11, an air inlet 12 and a liquid outlet 13, the air suction port 11 and the air inlet 12 are both located above the liquid level in the vacuum defoaming tank 1, and the liquid outlet 13 is located below the liquid level in the vacuum defoaming tank 1. The air suction port 11 is connected to a vacuum pump, and the vacuum pump is used to make the vacuum defoaming tank 1 in a negative pressure environment. The feed transfer tank 2 is provided with a first gas outlet 21, a first liquid inlet 22 and a first liquid outlet 23, the first gas outlet 21 is located above the liquid level in the feed transfer tank 2, and the first liquid outlet 23 is located below the liquid level in the feed transfer tank 2. The first liquid inlet 22 is connected to the external slurry supply pipe. When the external slurry enters the feed transfer tank 2, bubbles are easily generated. The first gas outlet 21 is connected to the air inlet 12. The vacuum pump is turned on to evacuate the vacuum defoaming tank 1, so that the bubbles in the feed transfer tank 2 can overflow into the vacuum defoaming tank 1 through the first gas outlet 21 and the air inlet 12 under the action of negative pressure. The bubbles gather in the vacuum defoaming tank 1 and break under the influence of negative pressure to re-form slurry. The reflux transfer tank 3 is provided with a second gas outlet 31, a second liquid inlet 32 ​​and a second liquid outlet 33. The second gas outlet 31 is located above the liquid level in the reflux transfer tank 3, and the second liquid outlet 33 is located below the liquid level in the reflux transfer tank 3. The liquid outlet 13 is connected to the second liquid inlet 32, that is, the slurry formed by the breaking of bubbles in the vacuum defoaming tank 1 can flow into the reflux transfer tank 3. If there is slurry flowing in the reflux transfer tank 3, bubbles are likely to be generated in the reflux transfer tank 3. The second gas outlet 31 is connected to the air inlet 12. The vacuum pump is turned on to evacuate the vacuum defoaming tank 1. The bubbles in the reflux transfer tank 3 can overflow into the vacuum defoaming tank 1 through the second gas outlet 31 and the air inlet 12 under the action of negative pressure. The bubbles gather in the vacuum defoaming tank 1 and break due to the negative pressure to re-form slurry.

[0046] Optionally, the first liquid outlet 23 is located at the bottom of the feed transfer tank 2 to ensure that the slurry in the feed transfer tank 2 can be completely transferred to the coating slurry tank 4. In this embodiment, the first liquid inlet 22 is located above the liquid level in the feed transfer tank 2, so as to increase the vertical distance between the first liquid inlet 22 and the first liquid outlet 23. Because bubbles are easily generated when the slurry enters the feed transfer tank 2, if the first liquid inlet 22 and the first liquid outlet 23 are close, it is difficult to ensure that all bubbles completely float above the liquid surface, and some bubbles may flow to the coating slurry tank 4 together with the slurry. In an optional embodiment, in order to reduce the bubbles generated when the slurry enters the feed transfer tank 2, the first liquid inlet 22 can be below the liquid level in the feed transfer tank 2, but not too close to the first liquid outlet 23.

[0047] Optionally, the second liquid outlet 33 is located at the bottom of the reflux transfer tank 3 to ensure that the slurry in the reflux transfer tank 3 can be completely transferred to the coating slurry tank 4. In this embodiment, the second liquid inlet 32 ​​is located above the liquid level in the reflux transfer tank 3, so as to increase the vertical distance between the second liquid inlet 32 ​​and the second liquid outlet 33. Because bubbles are easily generated when the slurry enters the reflux transfer tank 3, if the second liquid inlet 32 ​​and the second liquid outlet 33 are close, it is difficult to ensure that all bubbles completely float above the liquid surface, and some bubbles may flow to the coating slurry tank 4 together with the slurry. In an optional embodiment, in order to reduce the bubbles generated when the slurry enters the reflux transfer tank 3, the second liquid inlet 32 ​​can be below the liquid level in the reflux transfer tank 3, but not too close to the second liquid outlet 33.

[0048] Preferably, the liquid outlet 13 is located at the bottom of the vacuum defoaming tank 1 to ensure that the slurry in the vacuum defoaming tank 1 can be completely transported to the reflux transfer tank 3 .

[0049] Optionally, the coating slurry tank 4 is provided with a first port 41 and a second port 42, both of which are located below the liquid level in the coating slurry tank 4, so as to avoid the impact of the liquid level and the generation of bubbles in the process of replenishing the slurry in the coating slurry tank 4 by the feeding transfer tank 2 and the reflux transfer tank 3. The first liquid outlet 23 is connected to the first port 41 through the first tube 10, and the first valve 101 is provided on the first tube 10. The first tube 10 connects the feeding transfer tank 2 and the coating slurry tank 4, that is, most of the slurry in the coating slurry tank 4 is supplied through the first tube 10. The second liquid outlet 33 is connected to the second port 42 through the second tube 20, and the second tube 20 connects the reflux transfer tank 3 and the coating slurry tank 4. The second valve 201 is provided on the second tube 20, that is, a small part of the slurry in the coating slurry tank 4 is supplied through the second tube 20. In specific implementation, the second valve 201 can be opened when the slurry in the reflux transfer tank 3 reaches a first preset amount, so as to prevent bubbles from entering the coating slurry tank 4 due to less slurry in the reflux transfer tank 3 .

[0050] Preferably, the inner diameter of the first tube 10 is D1, the inner diameter of the second tube 20 is D2, and D1>D2.

[0051] Optionally, the second liquid inlet 32 ​​is connected to the liquid outlet 13 through a third tube 30, a third valve 301 is provided on the third tube 30, and the inner diameter of the third tube 30 is D, 5mm<D<25mm. The third tube 30 is used to discharge the slurry formed by the bursting of bubbles in the vacuum defoaming tank 1, so the inner diameter of the third tube 30 should not be too large to prevent the bubbles from flowing into the reflux transfer tank 3 with the slurry before they are burst. In specific implementation, the flow rate in the third tube 30 can also be controlled by controlling the opening degree of the third valve 301, which can also play the role of preventing bubbles from flowing out of the vacuum defoaming tank 1.

[0052] Optionally, the first gas outlet 21 and the second gas outlet 31 are connected to the air inlet 12 through the fourth tube 40, and the fourth valve 401 is provided on the fourth tube 40, and the fourth valve 401 is used to control the second gas outlet 31 and the connection between the second gas outlet 31 and the air inlet 12. In specific implementation, the fourth valve 401 can be opened again when the bubbles in the feed transfer tank 2 reach the second preset amount, and the vacuum pump can be turned on to suck the bubbles in the feed transfer tank 2 when the fourth valve 401 is opened. Since the bubbles will flow into the reflux transfer tank 3 after bursting in the vacuum defoaming tank 1, and bubbles will be generated in the reflux transfer tank 3, the fourth valve 401 is provided in this embodiment to simultaneously control the connection between the second gas outlet 31 and the first gas outlet 21 and the air inlet 12, so as to simplify the system structure. Specifically, the fourth pipe 40 includes a fourth main pipe and two fourth branch pipes that are connected to each other. One end of the fourth main pipe is connected to the gas inlet 12, and the other end of the fourth main pipe is connected to the first gas outlet 21 and the second gas outlet 31 respectively through the two fourth branch pipes. The fourth valve 401 is arranged on the fourth main pipe.

[0053] Optionally, the ends of the fourth tube 40 near the first gas outlet 21 and the second gas outlet 31 are telescopic tubes, and extend into the inside of the feed transfer tank 2 and the reflux transfer tank 3 respectively. If the end of the fourth tube 40 near the first gas outlet 21 is a telescopic tube, the length of the fourth tube 40 extending into the feed transfer tank 2 can be adjusted so that the portion of the fourth tube 40 extending into the feed transfer tank 2 can be close to the liquid surface, which is convenient for the bubbles in the feed transfer tank 2 to overflow through the fourth tube 40. If the end of the fourth tube 40 near the second gas outlet 31 is a telescopic tube, the length of the fourth tube 40 extending into the reflux transfer tank 3 can be adjusted so that the portion of the fourth tube 40 extending into the reflux transfer tank 2 can be close to the liquid surface, which is convenient for the bubbles in the reflux transfer tank 3 to overflow through the fourth tube 40.

[0054] Furthermore, in order to improve the vacuuming efficiency of the vacuum pump, the fourth valve 401 and the third valve 301 can be temporarily closed after the bubbles in the vacuum defoaming tank 1 reach a preset height. At this time, the vacuum pump can better form a negative pressure in the vacuum defoaming tank 1, and the bubbles are more likely to burst. When the bubbles drop to a certain height, the fourth valve 401 and the third valve 301 are opened. Therefore, the fourth valve 401 and the third valve 301 can be solenoid valves to achieve automatic opening and closing.

[0055] Optionally, the inner diameter of the fourth tube 40 is D4, where D4>D.

[0056] Optionally, a first exhaust hole 24 is further provided on the feed transfer tank 2 to ensure the air pressure balance in the feed transfer tank 2. A second exhaust hole 35 is further provided on the reflux transfer tank 3 to ensure the air pressure balance in the reflux transfer tank 3.

[0057] Optionally, the coating slurry tank 4 is further provided with a third port 43, the third port 43 is connected to a fifth pipe 50, and a fifth valve 501 is provided on the fifth pipe 50 to control the coating slurry tank 4 to deliver slurry to the coating head as needed.

[0058] Furthermore, a third liquid inlet 34 is provided on the reflux transfer tank 3, and the third liquid inlet 34 is connected to the external slurry reflux pipe. In specific implementation, after the slurry is transported from the coating slurry tank 4 to the coating head to complete the coating operation, there is still residual slurry that can be recovered through the slurry reflux pipe, and there are many bubbles in this part of the recovered slurry. The slurry reflux pipe is connected to the reflux transfer tank 3, and the part of the recovered slurry can be defoamed so that it can be transported to the coating slurry tank 4 again later.

[0059] In this embodiment, the third liquid inlet 34 is located above the liquid level in the reflux transfer tank 3, and the second liquid outlet 33 is located at the bottom of the reflux transfer tank 3, so as to increase the vertical distance between the third liquid inlet 34 and the second liquid outlet 33. Since bubbles are easily generated when the slurry enters the reflux transfer tank 3, if the third liquid inlet 34 and the second liquid outlet 33 are close, it is difficult to ensure that all bubbles completely float above the liquid surface, and some bubbles may flow to the coating slurry tank 4 together with the slurry. In an optional embodiment, in order to reduce the bubbles generated when the slurry enters the reflux transfer tank 3, the third liquid inlet 34 can be below the liquid level in the reflux transfer tank 3, but not too close to the second liquid outlet 33.

[0060] Furthermore, a stirrer 5 is provided on the coating slurry tank 4, and a stirring paddle 51 of the stirrer 5 is located below the liquid surface in the coating slurry tank 4. The slurry in the coating slurry tank 4 is stirred by the stirrer 5 to avoid slurry precipitation, but the stirring paddle 51 needs to be below the liquid surface and stirred at a low speed to avoid breaking the liquid surface and causing air to enter the slurry to generate bubbles.

[0061] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Slurry bubble elimination system, characterized in that: include: A coating slurry tank (4) for containing slurry; A vacuum defoaming tank (1) is provided with an air suction port (11), an air inlet (12) and a liquid outlet (13), wherein the air suction port (11) is connected to a vacuum pump; The feed transfer tank (2) is provided with a first gas outlet (21), a first liquid inlet (22) and a first liquid outlet (23), wherein the first gas outlet (21) is communicated with the gas inlet (12), the first liquid outlet (23) is communicated with the coating slurry tank (4), and the first liquid inlet (22) is communicated with an external slurry supply pipe; The reflux transfer tank (3) is provided with a second gas outlet (31), a second liquid inlet (32) and a second liquid outlet (33), wherein the second gas outlet (31) is connected to the gas inlet (12), the second liquid outlet (33) is connected to the coating slurry tank (4), and the second liquid inlet (32) is connected to the liquid outlet (13).

2. The slurry bubble elimination system according to claim 1, characterized in that: The first liquid outlet (23) is located at the bottom of the feed transfer tank (2); The second liquid outlet (33) is located at the bottom of the reflux transfer tank (3).

3. The slurry bubble elimination system according to claim 1, characterized in that: The coating slurry tank (4) is provided with a first port (41) and a second port (42) located below the liquid surface in the coating slurry tank (4); The first port (41) is connected to the first liquid outlet (23) via a first tube (10), and a first valve (101) is provided on the first tube (10); The second port (42) is connected to the second liquid outlet (33) via a second tube (20), and a second valve (201) is provided on the second tube (20).

4. The slurry bubble elimination system according to claim 1, characterized in that: The second liquid inlet (32) is connected to the liquid outlet (13) through a third tube (30). A third valve (301) is provided on the third tube (30). The inner diameter of the third tube (30) is D, 5 mm < D < 25 mm.

5. The slurry bubble elimination system according to claim 1, characterized in that: The first gas outlet (21) and the second gas outlet (31) are both connected to the gas inlet (12) via a fourth pipe (40); a fourth valve (401) is provided on the fourth pipe (40); the fourth valve (401) is used to control the communication between the first gas outlet (21) and the second gas outlet (31) and the gas inlet (12).

6. The slurry bubble elimination system according to claim 5, characterized in that: The ends of the fourth tube (40) close to the first gas outlet (21) and the second gas outlet (31) are telescopic tubes, and extend into the interior of the feed transfer tank (2) and the reflux transfer tank (3) respectively.

7. The slurry bubble elimination system according to claim 1, characterized in that: The reflux transfer tank (3) is also provided with a third liquid inlet (34), and the third liquid inlet (34) is connected to an external slurry reflux pipe.

8. The slurry bubble elimination system according to claim 7, characterized in that: The third liquid inlet (34) is located above the liquid level in the reflux transfer tank (3), and the second liquid outlet (33) is located at the bottom of the reflux transfer tank (3).

9. The slurry bubble elimination system according to claim 1, characterized in that: The feed transfer tank (2) is provided with a first exhaust hole (24); and / or, The reflux transfer tank (3) is provided with a second exhaust hole (35).

10. The slurry bubble elimination system according to any one of claims 1 to 9, characterized in that: The coating slurry tank (4) is provided with an agitator (5), and the agitator paddle (51) of the agitator (5) is located below the liquid level in the coating slurry tank (4).

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