Battery slurry feeding trolley with defoaming function

Abstract

The utility model discloses a battery slurry feeding trolley with a defoaming function, the feeding trolley is arranged at the position closest to a coating die head, a feeding pipeline is arranged in the feeding trolley and is connected to a slurry tank body, a spiral inner container is arranged in the slurry tank body, the rest space in the slurry tank body forms a flow channel, and the flow channel is communicated with the spiral inner container. The spiral inner container is of a hollow structure, a plurality of air holes are evenly distributed in the outer wall of the spiral inner container, and the end of the spiral inner container is connected to an exhaust pipeline. The defoaming device is simple in structure, and the plurality of spiral inner containers are arranged in the slurry tank body, so that gas in slurry enters the hollow areas of the inner containers through the air holes in the spiral inner containers and is exhausted through the exhaust pipeline, the content of bubbles in the slurry is reduced, and the purpose of defoaming is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery paste defoaming, in particular to a battery paste feeding trolley with a defoaming function. Background Technique

[0002] In the process of manufacturing lithium-ion batteries, coating is a key step of evenly coating the positive or negative paste on a metal current collector (such as aluminum foil or copper foil). The coating quality directly affects the performance and consistency of the battery. During mixing, transportation, and coating, bubbles are generated due to the introduction of air and the agitation of the paste. If these bubbles are not eliminated in time, shrinkage holes or pinholes will be formed during the drying process, and in severe cases, foil leakage will occur, affecting the electrochemical performance and safety of the battery. In traditional defoaming technologies, such as stirring and vacuum defoaming: in the dispersion kettle and the finished product tank, the paste is stirred at high speed and vacuumed to reduce bubbles. Adding defoaming agents: adding defoaming agents to the paste to reduce the surface tension and help the bubbles overflow.

[0003] Stirring and vacuum defoaming and adding defoaming agents are two common methods to reduce the bubbles in the paste during battery manufacturing. Although these methods can reduce bubbles to a certain extent, they also have some problems and limitations. The dispersion kettle for stirring and vacuum defoaming is located in the paste mixing process, and the finished product tank for stirring and vacuum defoaming is located in the coating process. After defoaming, the paste needs to be transported through a long pipeline to the coating die head, and there is no very effective defoaming before the paste is transported to the coating die head, resulting in incomplete elimination of the coating paste, and the bubbles are coated on the electrode plate with the paste during the coating process. And some defoaming agents may be incompatible with other components in the paste, affecting the stability of the paste and the performance of the battery. In the actual production process, the control of parameters such as stirring speed, time, type and dosage of defoaming agents is relatively complex and requires precise process adjustment. Summary of the Invention

[0004] The purpose of the utility model is to provide a battery paste feeding trolley with a defoaming function to solve the problems put forward in the above background technique. To achieve the above purpose, the utility model provides the following technical scheme: a battery paste feeding trolley with a defoaming function, the feeding trolley is arranged at the position closest to the coating die head, a feeding pipeline is arranged in the feeding trolley, the feeding pipeline is connected to the paste tank body, a spiral inner liner is arranged in the paste tank body, a flow channel is formed in the remaining space in the paste tank body, the spiral inner liner is a hollow structure, and a plurality of air holes are evenly distributed on the outer wall, and the end of the spiral inner liner is connected to an exhaust pipeline.

[0005] Preferably, a first diaphragm pump is arranged on the feeding pipeline.

[0006] Preferably, a feeding port and a discharging port are arranged on the paste tank body, a feeding pipeline is connected to the feeding port, and a discharging pipeline is connected to the discharging port.

[0007] Preferably, a second diaphragm pump is provided on the discharge pipeline.

[0008] Preferably, an isolation membrane is provided in the air hole, and the isolation membrane allows gas to pass through.

[0009] Preferably, a one-way exhaust valve is provided on the exhaust pipeline.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model has a novel design. By using a reasonable mechanical structure, it ingeniously exploits the internal potential of each element. A feeding trolley is provided, and the trolley can be easily installed at the position closest to the coating die head, so as to ensure that the slurry is coated as soon as possible after the bubbles in the slurry are eliminated, avoiding the re - formation of bubbles in the slurry due to too long pipeline transportation.

[0011] By providing a spiral inner liner in the slurry tank body, the slurry continuously contacts the spiral inner liner during the rising process. Due to surface tension, the flow rate of the slurry slows down on the surface of the spiral inner liner. Bubbles tend to concentrate in the area with a lower flow rate, so they move closer to and gather on the inner wall surface of the inner liner. Subsequently, these bubbles burst and release under the action of pressure. Since the air pressure inside the spiral inner liner is lower than the outside, the gas enters the hollow area of the inner liner through the air holes on the spiral inner liner and is discharged through the exhaust pipeline to reduce the bubble content in the slurry and achieve the purpose of defoaming.

[0012] The inner liner with a spiral design realizes a longer flow path in a limited space, which can enhance the flow power of the slurry in the tank body, increase the contact frequency and area between the slurry and the inner wall of the inner liner. At the same time, it can extend the flow path of the slurry in the tank body, increase the contact time between the slurry and the inner liner, and thus more effectively capture and discharge bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the internal structure of the present utility model;

[0014] Figure 2 is a schematic diagram of the spiral inner liner structure in the present utility model;

[0015] Figure 3 is Figure 2 the enlarged view of part A in

[0016] In the figure, feeding pipeline - 11, feeding port - 12, first diaphragm pump - 13, discharge pipeline - 21, discharge port - 22, second diaphragm pump - 23, slurry tank body - 3, spiral inner liner - 4, air hole - 41, isolation membrane - 42, flow path - 5, exhaust pipeline - 61, one - way exhaust valve - 62. DETAILED DESCRIPTION OF THE INVENTION

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1 , the present invention provides a technical solution: a battery slurry feeding trolley with a defoaming function. An inlet pipe 11 is provided in the feeding trolley. A first diaphragm pump 13 is provided on the inlet pipe 11. The inlet pipe 11 is connected to a slurry tank 3. An inlet port 12 and an outlet port 22 are provided on the slurry tank 3. An outlet pipe 21 is connected to the outlet port 22. A second diaphragm pump 23 is provided on the outlet pipe 21. The battery slurry is pumped into the inlet pipe 11 by the first diaphragm pump 13 and is drawn out from the outlet pipe 21 by the second diaphragm pump 23 after passing through the slurry tank 3.

[0019] Please refer to Figure 2-3 , a spiral inner tank 4 is provided in the slurry tank 3. The remaining space in the slurry tank 3 forms a flow channel 5. The spiral inner tank 4 is of a hollow structure, and a plurality of air holes 41 are uniformly distributed on the outer wall. A separation membrane 42 is provided in the air holes 41. The separation membrane 42 allows gas to pass through while retaining solid particles in the slurry. The end of the spiral inner tank 4 is connected to an exhaust pipe 61. A one-way exhaust valve 62 is provided on the exhaust pipe 61. The one-way exhaust valve 62 allows gas to only discharge from the hollow part of the inner tank to the outside, while preventing external air from re-entering the tank.

[0020] After the battery slurry enters the slurry tank 3, due to the action of the second diaphragm pump 23, the movement path of the slurry is from the bottom to the top of the slurry tank 3. During the rising process, the slurry continuously contacts the spiral inner tank 4. The flow rate of the slurry will slow down on the surface of the spiral inner tank 4 due to surface tension. Bubbles tend to concentrate in the area with a lower flow rate. Therefore, they will approach and gather on the inner wall surface of the inner tank. Subsequently, these bubbles burst and release under the action of pressure. Since the air pressure inside the spiral inner tank 4 is lower than the outside, gas enters the hollow area of the inner tank through the air holes 41 on the spiral inner tank 4 and is discharged through the exhaust pipe 61 to reduce the bubble content in the slurry and achieve the purpose of defoaming.

[0021] The feeding trolley is arranged at the position closest to the coating die head to ensure that the slurry is coated as soon as the bubbles in the slurry are eliminated during coating, and to avoid the re-formation of bubbles in the slurry due to too long pipeline transportation.

[0022] The inner tank with a spiral design achieves a longer flow path 5 within a limited space, which can enhance the flow power of the slurry in the tank, increase the contact frequency and area between the slurry and the inner wall of the tank. At the same time, it can extend the flow path of the slurry in the tank, increase the contact time between the slurry and the inner tank, and thus capture and discharge bubbles more effectively.

[0023] In addition, the inner tank with a spiral design can also promote the mixing inside the slurry, contribute to the uniform distribution of the components of the battery slurry, and improve the coating quality.

[0024] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery paste feeding trolley with defoaming function, characterized in that: The loading trolley is set at the position closest to the coating die head. An inlet pipe (11) is provided inside the loading trolley, and the inlet pipe (11) is connected to the slurry tank (3). A spiral inner liner (4) is provided inside the slurry tank (3), and the remaining space inside the slurry tank (3) forms a flow channel (5). The spiral inner liner (4) is of a hollow structure, and a number of air holes (41) are evenly distributed on the outer wall. The end of the spiral inner liner (4) is connected to an exhaust pipe (61).

2. The battery slurry feeding trolley with defoaming function according to claim 1, characterized in that: A first diaphragm pump (13) is provided on the inlet pipe (11).

3. The battery paste feeding trolley with defoaming function according to claim 2, characterized in that: The slurry tank (3) is provided with a feed inlet (12) and a discharge outlet (22). The feed inlet (12) is connected to an inlet pipe (11), and the discharge outlet (22) is connected to a discharge pipe (21).

4. The battery paste feeding trolley with defoaming function according to claim 3, characterized in that: A second diaphragm pump (23) is provided on the discharge pipe (21).

5. The battery slurry feeding trolley with defoaming function according to claim 4, characterized in that: An isolation membrane (42) is provided inside the air hole (41), and the isolation membrane (42) allows gas to pass through.

6. The battery slurry feeding trolley with defoaming function according to claim 5, characterized in that: A one-way exhaust valve (62) is provided on the exhaust pipe (61).

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