Electrolyte defoaming and recycling device

Abstract

The utility model provides an electrolyte defoaming and recycling device, and belongs to the technical field of lithium battery production. An electrolyte defoaming and recycling device comprises a vacuum source A, a nitrogen source A, an electrolyte raw material tank, a buffer tank A and a buffer tank B. The upper portion of the electrolyte raw material tank is connected with the vacuum source A and the nitrogen source A through a main pipeline 1, wherein the vacuum source A and the nitrogen source A are connected in parallel. A valve F13 is arranged on the main pipeline 1; a valve F11 and a valve F12 are respectively arranged on parallel pipelines of the vacuum source A and the nitrogen source A; the electrolyte raw material tank is in pipeline connection with the buffer tank A and the buffer tank B which are connected in parallel through a main pipeline 2, the main pipeline 2 extends below the electrolyte liquid level in the electrolyte raw material tank through a valve F31, and a valve F32 and a valve F33 are respectively arranged on the pipeline in which the buffer tank A and the buffer tank B are connected in parallel. According to the electrolyte recycling device, bubbles in the electrolyte are efficiently eliminated while the electrolyte is recycled, the efficiency in the production process is improved, particles in the electrolyte are reduced, and the production quality is improved.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery production technology, specifically relating to an electrolyte defoaming and recovery device. Background Technology

[0002] When a production cycle is completed, or when switching to different electrolyte systems to produce batteries of different specifications, the electrolyte remaining in the buffer tank needs to be cleaned. Electrolytes are easily affected by oxygen, moisture, and impurities, which can alter their physicochemical properties and thus affect production quality. Previously, the electrolyte in the buffer tank was simply discharged and discarded, resulting in significant waste and increased production costs.

[0003] Application No. 201520994259.2 discloses a lithium battery filling machine electrolyte recovery system that utilizes a vacuum generator to create a pressure difference, thereby recovering the electrolyte generated by the filling machine's storage tank and the filling pump's degassing process. However, this technical solution has very low production efficiency, and the production quality needs improvement. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the production efficiency of the method of using a vacuum generator to form a pressure difference to recover the electrolyte generated by the liquid injection machine storage tank and the liquid injection pump to remove air bubbles is too low. In view of the shortcomings of the existing technology, an electrolyte defoaming and recovery device is provided.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An electrolyte defoaming and recovery device includes a vacuum source A, a nitrogen source A, an electrolyte raw material tank, a buffer tank A, and a buffer tank B. The electrolyte raw material tank is connected to the vacuum source A and the nitrogen source A in parallel via a first pipe. A valve F13 is installed on the first pipe. Valves F11 and F12 are respectively installed on the parallel pipes of the vacuum source A and the nitrogen source A.

[0007] The electrolyte raw material tank is connected to the parallel buffer tanks A and B via a second pipe. The second pipe extends into the electrolyte raw material tank below the electrolyte level via valve F31. Valves F32 and F33 are respectively installed on the parallel pipes of buffer tanks A and B.

[0008] Furthermore, the parallel buffer tanks A and B are connected to one end of the third pipeline via valves F23 and F24, respectively; the other end of the third pipeline is connected to the vacuum source B via valve F21.

[0009] Furthermore, the vacuum source B and valve F21 are connected in parallel to a nitrogen source B and a valve F22 on the third pipeline.

[0010] Furthermore, a filter device is installed on the second pipe.

[0011] Furthermore, valves F11, F12, F13, F21, F22, F23, F24, F31, F32, F33, F41, and F42 are all solenoid valves.

[0012] Furthermore, several buffer containers A or B can be connected in parallel.

[0013] Compared with the prior art, this utility model can efficiently eliminate air bubbles in the electrolyte while recovering the electrolyte in the buffer tank after the production process is completed, thereby increasing the efficiency of the production process, reducing the generation of particles in the electrolyte, and improving the production quality. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] Figure 1 : Schematic diagram of this utility model. Detailed Implementation

[0016] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details.

[0017] An electrolyte defoaming and recovery device includes a vacuum source A, a nitrogen source A, an electrolyte raw material tank, a buffer tank A, and a buffer tank B. The electrolyte raw material tank is connected to the vacuum source A and the nitrogen source A in parallel via a first pipe 1. A valve F13 is installed on the first pipe 1. Valves F11 and F12 are respectively installed on the parallel pipes of the vacuum source A and the nitrogen source A.

[0018] The electrolyte raw material tank is connected to the parallel buffer tanks A and B via a second pipe 2. The second pipe 2 extends into the electrolyte raw material tank below the electrolyte level via a valve F31. Valves F32 and F33 are respectively installed on the parallel pipes of buffer tanks A and B.

[0019] Furthermore, the parallel buffer tanks A and B are respectively connected to one end of the third pipeline 3 via valves F23 and F24;

[0020] Furthermore, several buffer containers A or B can be connected in parallel.

[0021] During the production process, the unavoidable handling of the electrolyte raw material tank causes some electrolyte to decompose and generate bubbles. These bubbles can affect the electrolyte's conductivity, reduce battery performance, and may even lead to internal short circuits or overheating. The buffer tank primarily stores the electrolyte transported from the raw material tank via pipeline. After defoaming treatment using a settling method, it enters the next production stage. By connecting several buffer tanks in parallel, at least one buffer tank continuously supplies the defoamed electrolyte needed for the next production process, objectively improving production efficiency.

[0022] Furthermore, the other end of the third pipe 3 is connected to the vacuum source B via valve F21.

[0023] For bubbles in the electrolyte that are difficult to remove from the buffer tank, or for the problem of bubbles escaping too slowly, an external vacuum source can be used to apply vacuum adsorption, which reduces the air pressure inside the container, making it easier for the bubbles to escape.

[0024] Furthermore, the vacuum source B and valve F21 are connected in parallel with a nitrogen source B and valve F22 on the third pipeline 3.

[0025] By using a parallel nitrogen source, after the electrolyte bubbles in the buffer tank are released by vacuum adsorption and settling in vacuum source B, nitrogen is introduced into the buffer tank to break the vacuum state inside the buffer tank, making it easier for the electrolyte in the buffer tank to participate in the next production process.

[0026] Furthermore, a filter device is installed on the second pipe 2.

[0027] During storage and transportation, if the electrolyte is contaminated by external factors or if the equipment used for producing and transporting the electrolyte is not rigorously cleaned and maintained, residues may remain inside the equipment. These residues may then contaminate the electrolyte during subsequent production. Particulate matter in the electrolyte can cause internal short circuits in the battery, affecting its performance and lifespan. Therefore, controlling the size and quantity of particles in the electrolyte is crucial. A particle filter device installed on the second pipeline 2 can perform bidirectional filtration of the transported and recovered electrolyte, further reducing the particle size and thus improving the production quality of lithium batteries.

[0028] Furthermore, valves F11, F12, F13, F21, F22, F23, F24, F31, F32, F33, F41, and F42 are all solenoid valves.

[0029] All valves are connected to a control terminal using solenoid valves, enabling the valves to be opened or closed quickly and accurately.

[0030] Work process:

[0031] When using, valves F24, F32, F33, F41, F42 and F22 should be closed first;

[0032] Valve F23 and valve F21 are open;

[0033] Vacuum source B operates to evacuate buffer container A;

[0034] After the specified vacuum level is reached inside buffer container A:

[0035] Valve F21, valve F22, valve F23 and valve F11 are closed;

[0036] Valves F12, F13, F31, and F32 are open;

[0037] Because of the pressure difference between the buffer tank and the electrolyte raw material tank, the electrolyte passes through the filtration device under the action of the pressure difference to reduce the particle size in the electrolyte, and then flows to the buffer tank A. At this time, nitrogen source A releases nitrogen as a medium protective gas to fill the electrolyte raw material tank to balance the gas pressure between the buffer tank A and the electrolyte raw material tank.

[0038] After the electrolyte flowing into buffer tank A reaches the specified level:

[0039] Valve F12, valve F13, valve F31 and valve F32 are closed;

[0040] Valve F21 and valve F23 are open;

[0041] The vacuum source B operates to evacuate the buffer tank A, accelerating the escape rate of bubbles in the electrolyte. Then, depending on the type of electrolyte, the vacuum state is maintained for different periods of time.

[0042] After the electrolyte in the buffer tank A has been allowed to settle under vacuum:

[0043] Valve F21 is closed;

[0044] Valve F22 is open;

[0045] The nitrogen source B releases nitrogen as a protective medium to break the vacuum state of the buffer tank A.

[0046] After the vacuum state of the buffer container A is completely broken:

[0047] Valves F22 and F23 are closed;

[0048] Valve F41 is open;

[0049] The electrolyte in the buffer tank A can then be used in the next stage of lithium battery production.

[0050] At this point, the buffer tank B can perform defoaming and filtration operations according to the above process through the coordination of various valves.

[0051] Once the defoamed electrolyte in buffer tank A is used up, the electrolyte in buffer tank B, which has been defoamed and allowed to settle, can be switched to participate in production by using a valve.

[0052] When electrolyte needs to be recycled at the end of a production cycle to avoid waste:

[0053] Valve F12, valve F21, valve F41 and valve F42 are closed;

[0054] Valves F11, F13, F31, F32, F33, F22, F23, and F24 are open;

[0055] When vacuum source A is activated, it creates a negative pressure inside the electrolyte raw material tank. Under the action of the pressure difference, the electrolyte flows from buffer tanks A and B through the filtration device to reduce the particle size of the electrolyte before flowing back into the electrolyte raw material tank.

[0056] This invention achieves efficient elimination of air bubbles in the electrolyte while recovering the electrolyte in the buffer tank after the production process is completed, thereby increasing the efficiency of the production process, reducing the generation of particles in the electrolyte, lowering production costs, and improving production quality.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model. The above are only preferred embodiments of this utility model and are not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrolyte defoaming and recovery device, characterized in that: It includes a vacuum source A, a nitrogen source A, an electrolyte raw material tank, a buffer tank A, and a buffer tank B. The electrolyte raw material tank is connected to the vacuum source A and the nitrogen source A in parallel via a first pipe (1). A valve F13 is installed on the first pipe (1). Vacuum source A and nitrogen source A are respectively installed on the parallel pipes of vacuum source A and nitrogen source A. The electrolyte raw material tank is connected to the parallel buffer tanks A and B via a second pipe (2). The second pipe (2) extends into the electrolyte raw material tank below the electrolyte level via a valve F31. Valves F32 and F33 are respectively installed on the parallel pipes of buffer tanks A and B.

2. The electrolyte defoaming and recovery device according to claim 1, characterized in that: The parallel buffer tanks A and B are connected to one end of the third pipe (3) via valves F23 and F24, respectively; the other end of the third pipe (3) is connected to the vacuum source B via valve F21.

3. The electrolyte defoaming and recovery device according to claim 2, characterized in that: The vacuum source B and valve F21 are connected in parallel with nitrogen source B and valve F22 on the third pipeline (3).

4. The electrolyte defoaming and recovery device according to claim 1, characterized in that: A filter device is installed on the second pipe (2).

5. An electrolyte defoaming and recovery device according to any one of claims 1-3, characterized in that: Valves F11, F12, F13, F21, F22, F23, F24, F31, F32, F33, F41, and F42 are all solenoid valves.

6. The electrolyte defoaming and recovery device according to claim 1, characterized in that: Several buffer containers A or B can be connected in parallel.

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