High-precision sealing device for lithium battery

Abstract

This invention discloses a high-precision sealing device for lithium batteries, relating to the field of lithium battery production technology. By incorporating a spiral injection assembly, the electrolyte, after being transported through the inner injection tube, diffuses towards the spiral blades under the guidance of the arc surface and is released into the cell through spirally distributed outlet holes. This creates a spiral diffusion flow of electrolyte, which, compared to the traditional single-point direct injection method, reduces the local impact of the electrolyte on the electrode, improves the uniformity of electrolyte distribution between the electrode layer and the separator layer, and reduces local dry areas and bubble accumulation, thereby improving the quality and wetting efficiency of the cell injection. Furthermore, the vacuum channel, suction groove, and negative pressure degassing assembly can perform local negative pressure degassing treatment inside the cell after injection, allowing tiny bubbles adhering to the electrode surface and separator pores to be discharged promptly, reducing liquid surface fluctuations and secondary bubble generation, thus improving electrolyte wetting sufficiency and cell consistency.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production technology, specifically a high-precision sealing device for lithium batteries. Background Technology

[0002] Lithium-ion batteries, widely used in new energy vehicles, energy storage devices, consumer electronics, and industrial power supplies, depend not only on the performance of the positive and negative electrode materials, separator, and electrolyte themselves, but also on the level of process control during manufacturing. The electrolyte injection process is a crucial step in lithium-ion battery manufacturing, directly affecting the electrolyte distribution within the cell, the wetting effect on the electrodes, and the battery's subsequent charge and discharge performance. Because the electrolyte needs to fully penetrate the microporous structure of the positive and negative electrodes and the pore network of the separator to form complete and stable ion transport channels, the quality of the electrolyte injection directly impacts the battery's capacity utilization, rate performance, cycle life, and product consistency.

[0003] Currently, in order to improve the wetting efficiency of electrolyte on electrodes and separators, a vacuum injection process is usually adopted in the production process. This involves first evacuating the inside of the cell to remove air from the inside of the cell and the pores of the electrodes, and then injecting electrolyte into the cell. This utilizes the pressure difference to promote the penetration of electrolyte into the deeper areas of the cell. However, due to the large number of micron-sized pores inside the electrodes and the complex multi-layer stacked or wound structure between the electrode layer and the separator layer, even after vacuum treatment, some residual gas is still difficult to completely remove. Summary of the Invention

[0004] In view of the problems that existing lithium battery electrolyte injection devices often use a one-way direct injection method to inject electrolyte during the injection process, which can easily cause local impact of electrolyte on the electrode, resulting in uneven electrolyte distribution, insufficient local wetting, and a large number of residual air bubbles, this invention provides a high-precision sealing device for lithium batteries.

[0005] This invention is achieved through the following technical solution: a high-precision sealing device for lithium batteries, including a lithium battery liquid injection machine, wherein the lithium battery liquid injection machine is provided with a cell delivery system and a liquid injection lifting system, and a liquid injection system is provided on the outside of the liquid injection lifting system. The liquid injection system includes a vacuum clamp and a liquid injection input pipe, wherein the vacuum clamp is installed on the outer surface of the liquid injection system, and a liquid injection input pipe is provided on the vacuum clamp. The bottom surface of the vacuum clamp is provided with a spiral liquid injection assembly, which includes an inner liquid injection tube, an outer liquid injection tube, an inner ring plate, a spiral column, spiral blades, an outlet hole, an arc surface, and a vacuum flow channel. The outer liquid injection tube is installed inside the vacuum clamp, and the inner liquid injection tube is installed inside the liquid injection input tube. The inner ring plate is installed inside the outer liquid injection tube. The top surface of the inner ring plate is fixedly connected to the bottom surface of the inner liquid injection tube. The spiral column is installed on the outer surface of the inner ring plate, and the spiral blades are fixedly connected to the outer side of the spiral column. The spiral column has an arc surface. Several outlet holes are spirally and evenly distributed on the outer liquid injection tube. After the electrolyte enters the inner liquid injection tube through the liquid injection input tube, it is discharged through the outlet hole and forms a spiral diffusion flow under the guiding action of the spiral blades, which makes the electrolyte wetting uniform and reduces the residual bubbles.

[0006] Furthermore, a vacuum flow channel is formed between the outer surface of the inner injection tube and the inner surface of the outer injection tube, and two suction grooves are formed on the outer surface of the outer injection tube.

[0007] Furthermore, the suction chute reduces the direct impact of the back pressure airflow on the electrolyte surface.

[0008] Furthermore, the arc surface is located at the top of the spiral column to guide and disperse the electrolyte, allowing the electrolyte to diffuse along the arc surface onto the spiral blade surface, thereby increasing the contact area between the electrolyte and the spiral blade.

[0009] Furthermore, the liquid injection system also includes a vacuum tube, a solenoid valve, and a vacuum chamber. The vacuum tube is connected to the vacuum chamber, the solenoid valve is installed on the vacuum tube, the vacuum clamp has a vacuum chamber inside, the vacuum clamp is connected to a vacuum tube inside, and a solenoid valve is installed on one end surface of the vacuum tube.

[0010] Furthermore, the vacuum channel is connected to the vacuum tube, and the vacuum channel is used to guide the gas generated in the injection area into the vacuum chamber for discharge.

[0011] Furthermore, the injection tube is equipped with a negative pressure defoaming assembly, which includes a negative pressure regulating tube, a hydraulic rod, a piston, and a back pressure air tube. The negative pressure regulating tube is connected to the outer surface of the injection tube, and a hydraulic rod is fixedly installed on one end of the negative pressure regulating tube.

[0012] Furthermore, a piston is mounted on one end surface of the hydraulic rod, and the outer surface of the piston is in contact with the inner wall of the negative pressure regulating pipe. A back pressure pipe is connected to the outer side of the negative pressure regulating pipe, and the negative pressure regulating pipe is connected to the vacuum pipe. When the hydraulic rod drives the piston to move, it can adjust the negative pressure state in the vacuum channel.

[0013] Furthermore, the bottom end of the vacuum clamp is provided with a sealing assembly, which includes a sealing ring, an electromagnet, a sealing gasket, and a slot. An electromagnet is installed on the bottom surface of the vacuum clamp, and two slots are opened on the outer surface of the liquid injection tube. The sealing ring is movably installed on the outer surface of the two slots.

[0014] Furthermore, the bottom surface of the sealing ring is provided with a sealing gasket for quick positioning and sealing between the battery filling ports.

[0015] The present invention has the following beneficial effects: 1. This high-precision sealing device for lithium batteries, by setting up a spiral liquid injection component, allows the electrolyte to be transported through the inner injection tube and diffused into the spiral blades under the guiding effect of the arc surface. It is then released into the cell through the spirally distributed liquid outlet holes, forming a spiral diffusion flow of electrolyte. Compared with the traditional single-point direct injection method, this can reduce the local impact of electrolyte on the electrode, improve the uniformity of electrolyte distribution between the electrode layer and the separator layer, reduce local dry areas and bubble accumulation, thereby improving the quality of electrolyte injection and wetting efficiency of the cell.

[0016] 2. This high-precision sealing device for lithium batteries, by setting up a vacuum flow channel, an air intake chute, and a negative pressure degassing component, can perform local negative pressure degassing treatment inside the cell after electrolyte injection. This allows tiny bubbles attached to the electrode surface and in the pores of the separator to be discharged in time. At the same time, the back pressure gas is guided into the cell through the air intake chute, avoiding the back pressure airflow from directly impacting the electrolyte surface, reducing surface fluctuations and the generation of secondary bubbles, thereby improving the full wetting of the electrolyte and the consistency of the cell.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the lithium battery filling machine of the present invention; Figure 2 This is a schematic diagram of the overall structure of the liquid injection lifting system of the present invention; Figure 3 This is a schematic diagram of the overall structure of the injection system of the present invention; Figure 4 This is a schematic diagram of the overall structure of the injection system of the present invention from another perspective; Figure 5 This is a schematic diagram of the internal structure of the injection system of the present invention; Figure 6 This is a schematic diagram of the overall structure of the negative pressure defoaming component of the present invention; Figure 7 This is a schematic diagram of the internal structure of the spiral injection assembly of the present invention; Figure 8This is a schematic diagram of the internal structure of the spiral injection assembly of the present invention from another perspective.

[0019] In the diagram: 1. Lithium battery liquid filling machine; 2. Cell delivery system; 3. Liquid filling lifting system; 4. Liquid filling system; 401. Vacuum clamp; 402. Liquid filling input pipe; 403. Vacuum pipe; 404. Solenoid valve; 405. Vacuum chamber; 5. Spiral liquid filling assembly; 501. Inner liquid filling pipe; 502. Outer liquid filling pipe; 503. Inner ring plate; 504. Spiral column; 505. Spiral blade; 506. Liquid outlet; 507. Arc surface; 508. Vacuum flow channel; 509. Suction chute; 6. Negative pressure defoaming assembly; 601. Negative pressure regulating pipe; 602. Hydraulic rod; 603. Piston; 604. Back pressure pipe; 7. Sealing assembly; 701. Sealing ring; 702. Electromagnet; 703. Sealing gasket; 704. Slot. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0022] Please see Figures 1-8 The present invention provides a technical solution: a high-precision sealing device for lithium batteries, including a lithium battery liquid injection machine 1, a cell delivery system 2 and a liquid injection lifting system 3 inside the lithium battery liquid injection machine 1, a liquid injection system 4 outside the liquid injection lifting system 3, the liquid injection system 4 including a vacuum clamp 401 and a liquid injection input pipe 402, the vacuum clamp 401 is installed on the outer surface of the liquid injection system 4, and the liquid injection input pipe 402 is provided on the vacuum clamp 401; The bottom surface of the vacuum clamp 401 is provided with a spiral liquid injection assembly 5. The spiral liquid injection assembly 5 includes an inner liquid injection tube 501, an outer liquid injection tube 502, an inner ring plate 503, a spiral column 504, a spiral blade 505, a liquid outlet 506, an arc surface 507, and a vacuum flow channel 508. The outer liquid injection tube 502 is installed inside the vacuum clamp 401, and the inner liquid injection tube 501 is installed inside the liquid injection input tube 402. The inner ring plate 503 is installed inside the outer liquid injection tube 502. The top surface of the inner ring plate 503 is fixedly connected to the bottom surface of the inner liquid injection tube 501, and the spiral column 504 is installed on the outer surface of the inner ring plate 503. 04. The spiral blade 505 is fixedly connected to the outside of the spiral column 504. The spiral column 504 is provided with an arc surface 507. Several liquid outlet holes 506 are spirally and evenly distributed on the outer liquid injection tube 502. The electrolyte enters the inner liquid injection tube 501 through the liquid injection input tube 402 and is discharged through the liquid outlet holes 506. Under the guiding action of the spiral blade 505, a spiral diffusion flow is formed, which makes the electrolyte wettability uniform and reduces the residual air bubbles. The cell conveying system 2 is selected as a tray conveying mechanism. The liquid injection lifting system 3 is preferably a screw lifting mechanism. The liquid injection system 4 is installed at the output end of the liquid injection lifting system 3 and moves synchronously with the liquid injection lifting system 3.

[0023] A vacuum channel 508 is formed between the outer surface of the inner injection tube 501 and the inner surface of the outer injection tube 502. Two suction grooves 509 are formed on the outer surface of the outer injection tube 502. The two suction grooves 509 are symmetrically distributed along the circumference of the outer injection tube 502 and are connected to the vacuum channel 508, so that the gas escaping from the inside of the cell can enter the vacuum channel 508 through the suction grooves 509 and be discharged, thereby improving the gas discharge efficiency inside the cell and reducing the phenomenon of residual bubbles during electrolyte wetting.

[0024] The suction trough 509 reduces the direct impact of back pressure airflow on the electrolyte surface. The opening of the suction trough 509 faces away from the liquid outlet 506, so that the back pressure gas will be deflected after entering the suction trough 509, avoiding the back pressure gas from directly impacting the electrolyte surface, thereby reducing surface fluctuations and reducing the probability of secondary bubble generation.

[0025] The arc surface 507 is located at the top of the spiral column 504 and is used to guide and disperse the electrolyte, allowing the electrolyte to diffuse along the arc surface 507 to the surface of the spiral blade 505, thereby increasing the contact area between the electrolyte and the spiral blade 505. After the electrolyte flows out through the inner injection tube 501, it first contacts the arc surface 507 and diffuses evenly along the arc surface 507 to the surface of the spiral blade 505, thereby increasing the contact area between the electrolyte and the spiral blade 505 and enabling the electrolyte to form a more uniform spiral diffusion flow.

[0026] The electrolyte injection system 4 also includes a vacuum tube 403, a solenoid valve 404, and a vacuum chamber 405. The vacuum tube 403 is connected to the vacuum chamber 405. The solenoid valve 404 is installed on the vacuum tube 403. The vacuum clamp 401 has a vacuum chamber 405 inside. The vacuum clamp 401 is connected to the vacuum tube 403. The solenoid valve 404 is installed on one end surface of the vacuum tube 403, so that a stable negative pressure environment is formed between the vacuum clamp 401 and the lithium battery, thereby improving the wetting ability of the subsequent electrolyte on the electrode and separator pores.

[0027] Vacuum channel 508 is connected to vacuum tube 403. Vacuum channel 508 is used to guide the gas generated in the liquid injection area into vacuum chamber 405 for discharge. The lower end of vacuum channel 508 is connected to suction groove 509 to avoid gas accumulation inside the cell and affecting electrolyte wetting effect.

[0028] The injection tube 502 is equipped with a negative pressure defoaming assembly 6, which includes a negative pressure regulating tube 601, a hydraulic rod 602, a piston 603, and a back pressure air tube 604. The negative pressure regulating tube 601 is connected to the outer surface of the injection tube 502, and the hydraulic rod 602 is fixedly installed on one end surface of the negative pressure regulating tube 601. The hydraulic rod 602 is arranged along the axial direction of the negative pressure regulating tube 601, so that the negative pressure defoaming assembly 6 can independently adjust the negative pressure inside the vacuum channel 508, thereby improving the suction capacity for microbubbles.

[0029] A piston 603 is mounted on one end of the hydraulic rod 602. The outer surface of the piston 603 is in contact with the inner wall of the negative pressure regulating pipe 601. A back pressure pipe 604 is connected to the outer side of the negative pressure regulating pipe 601. The negative pressure regulating pipe 601 is connected to the vacuum pipe 403. When the hydraulic rod 602 drives the piston 603 to move, it can adjust the negative pressure state in the vacuum channel 508. The back pressure pipe 604 is connected to the negative pressure regulating pipe 601. By driving the piston 603 to move through the hydraulic rod 602, the internal volume of the negative pressure regulating pipe 601 is changed, so that the system can switch between the negative pressure defoaming state and the slow back pressure state, thereby improving the full wetting of the electrolyte.

[0030] The bottom end of the vacuum clamp 401 is provided with a sealing component 7, which includes a sealing ring 701, an electromagnet 702, a sealing gasket 703, and a slot 704. The electromagnet 702 is installed on the bottom surface of the vacuum clamp 401. Two slots 704 are opened on the outer surface of the liquid injection tube 502. The sealing ring 701 is movably installed on the outer surface of the two slots 704. The sealing ring 701 is movably sleeved on the outside of the liquid injection tube 502 and located in the limiting area formed by the slots 704, so that the sealing ring 701 can move axially along the liquid injection tube 502, thereby realizing the rapid pressing and sealing of the lithium battery injection port.

[0031] The bottom surface of the sealing ring 701 is provided with a sealing gasket 703 for quick positioning and sealing between the battery filling ports. The sealing gasket 703 is made of an elastic sealing material that is resistant to electrolyte corrosion, thereby improving the sealing reliability and reducing the risk of leakage during the vacuuming process.

[0032] The specific workflow of this invention is as follows: When the lithium battery liquid injection machine 1 is working, the lithium battery to be injected is first transported to the designated liquid injection station of the lithium battery liquid injection machine 1 through the cell conveying system 2. When the lithium battery arrives at the station, it stops moving. Then, the liquid injection lifting system 3 drives the liquid injection system 4 to move downward, so that the vacuum clamp 401 corresponds to the position of the liquid injection port on the top of the lithium battery.

[0033] During the descent, the outer injection tube 502 is first inserted into the lithium battery injection port. The controller then energizes the electromagnet 702. The sealing ring 701, made of magnetic material, is fitted onto the outside of the slot 704 of the outer injection tube 502. The electromagnet 702 and the sealing ring 701 have the same magnetic properties on their corresponding surfaces. The electromagnet 702 and the sealing ring 701 directly generate a repulsive force. The sealing ring 701 drives the sealing gasket 703 to press tightly against the surface around the battery injection port, thereby forming a sealed area. This keeps the sealing ring 701 stably pressed, preventing air leakage during subsequent vacuuming and improving sealing reliability.

[0034] After sealing is completed, the solenoid valve 404 is opened, and the external vacuum equipment evacuates the vacuum chamber 405 through the vacuum tube 403. Since the vacuum chamber 405, the vacuum channel 508, the suction groove 509 and the inside of the lithium battery are connected, the air inside the cell and the residual gas in the electrode pores are gradually extracted, so that a negative pressure environment is formed inside the lithium battery cell, thereby improving the subsequent electrolyte wetting efficiency.

[0035] Once the vacuum level reaches the set value, the pumping is shut off, and the electrolyte injection operation begins. The electrolyte is supplied by the external supply system to the injection inlet pipe 402 and flows downwards along the inner injection pipe 501. Upon reaching the bottom of the inner injection pipe 501, the electrolyte first contacts the arc surface 507. Due to the arc-shaped guiding structure of the arc surface 507, the electrolyte diffuses evenly in all directions under its guiding effect, allowing it to quickly flow onto the spiral blades 505. The electrolyte then flows past the spiral blades 505 on the outside of the spiral column 504. The spiral blades 505... The electrolyte flow is guided to form a spiral flow state. At the same time, the electrolyte is gradually discharged through multiple spirally distributed outlet holes 506. Since the multiple outlet holes 506 are spirally distributed along the outer injection tube 502, the electrolyte can be slowly released from multiple directions and diffuse into the inside of the cell. This makes the electrolyte form a relatively gentle spiral diffusion flow when entering the cell, which not only reduces the local impact of the electrolyte on the electrode, but also improves the uniformity of electrolyte distribution between the electrode layer and the separator layer, thereby reducing the generation of local dry areas.

[0036] Furthermore, since a low-flow electrolyte injection is used in the initial stage, the electrolyte first gradually fills the area between the outer injection tube 502 and the lithium battery injection port from bottom to top, so that the spiral distribution outlet holes 506 located at the bottom are gradually immersed in the electrolyte. At this time, the electrolyte slowly enters the lithium battery through multiple outlet holes 506 and begins to wet the electrode and separator structure. As the injection volume gradually increases, the electrolyte level continues to rise. When the electrolyte level exceeds the uppermost outlet hole 506, multiple outlet holes 506 are all covered by liquid. At this time, the spiral diffusion flow formed by the spiral blades 505 can continuously and evenly transport the electrolyte to the periphery of the cell, reducing local impact phenomena and avoiding local dry areas caused by excessively fast immersion on one side. In addition, the injection lifting system 3 drives the injection system 4 to rise, preventing the electrolyte level from exceeding the uppermost outlet hole 506, so that the suction chute 509 is always above the electrolyte level.

[0037] Once the set injection volume is reached, the liquid supply stops, and the negative pressure degassing component 6 operates via the controller. The hydraulic rod 602 drives the piston 603 to move slowly inside the negative pressure regulating tube 601, creating an adjustable negative pressure state inside the tube. This negative pressure state draws air from inside the lithium battery through the vacuum channel 508 and the suction groove 509, further enhancing the ability to draw out tiny bubbles. This allows the tiny bubbles attached to the electrode surface and in the pores of the separator to be removed in time, improving the degassing efficiency.

[0038] After a period of time, the hydraulic rod 602 drives the piston 603 to move slowly inside the negative pressure regulating pipe 601, gradually reducing the obstruction space of the piston 603 on the back pressure pipe 604. Gas is slowly introduced into the system through the back pressure pipe 604 for back pressure treatment. After passing through the vacuum channel 508 and the suction chute 509, the back pressure gas does not directly rush to the electrolyte surface, but is first guided by the suction chute 509. The suction chute 509 changes the direction of gas flow, so the back pressure gas will not directly impact the electrolyte surface. Therefore, it can effectively reduce surface fluctuations and the generation of secondary bubbles. At the same time, as the system pressure gradually recovers, the electrolyte further penetrates into the electrode micropores, diaphragm pores and deep areas of the battery cell under the action of pressure difference, achieving a more thorough wetting effect.

[0039] After the back pressure is released, the electromagnet 702 is de-energized, the sealing ring 701 is released from its locked state, and then the liquid injection lifting system 3 drives the entire liquid injection system 4 to reset upward and detach from the battery. The cell conveying system 2 transports the battery that has completed liquid injection to the next process for sealing, thereby completing the entire high-precision liquid injection and sealing process of lithium battery.

Claims

1. A high-precision sealing device for lithium batteries, comprising a lithium battery liquid injection machine (1), wherein the lithium battery liquid injection machine (1) is provided with a cell delivery system (2) and a liquid injection lifting system (3), and a liquid injection system (4) is provided on the outside of the liquid injection lifting system (3), characterized in that: The liquid injection system (4) includes a vacuum clamp (401) and a liquid injection inlet pipe (402). The vacuum clamp (401) is installed on the outer surface of the liquid injection system (4), and the liquid injection inlet pipe (402) is provided on the vacuum clamp (401). The bottom surface of the vacuum clamp (401) is provided with a spiral liquid injection assembly (5). The spiral liquid injection assembly (5) includes an inner liquid injection tube (501), an outer liquid injection tube (502), an inner ring plate (503), a spiral column (504), spiral blades (505), a liquid outlet (506), an arc surface (507), and a vacuum flow channel (508). The outer liquid injection tube (502) is installed inside the vacuum clamp (401), the inner liquid injection tube (501) is installed inside the liquid injection input pipe (402), and the inner ring plate (503) is installed inside the outer liquid injection tube (502). The top of the inner ring plate (503) is... The surface is fixedly connected to the bottom surface of the inner tube (501). The outer surface of the inner ring plate (503) is equipped with a spiral column (504). The spiral blade (505) is fixedly connected to the outer side of the spiral column (504). The spiral column (504) is provided with an arc surface (507). Several outlet holes (506) are spirally distributed and evenly opened on the outer tube (502). The electrolyte enters the inner tube (501) through the injection input pipe (402) and is discharged through the outlet hole (506). Under the guiding action of the spiral blade (505), a spiral diffusion flow is formed, which makes the electrolyte wettability uniform and reduces the residual bubbles.

2. The high-precision sealing device for lithium batteries according to claim 1, characterized in that: A vacuum flow channel (508) is formed between the outer surface of the inner injection tube (501) and the inner surface of the outer injection tube (502), and two suction grooves (509) are opened on the outer surface of the outer injection tube (502).

3. The high-precision sealing device for lithium batteries according to claim 2, characterized in that: The suction chute (509) reduces the direct impact of the back pressure airflow on the electrolyte surface.

4. The high-precision sealing device for lithium batteries according to claim 1, characterized in that: The arc surface (507) is located at the top of the spiral column (504) and is used to guide and disperse the electrolyte, so that the electrolyte diffuses along the arc surface (507) to the surface of the spiral blade (505), thereby increasing the contact area between the electrolyte and the spiral blade (505).

5. The high-precision sealing device for lithium batteries according to claim 1, characterized in that: The liquid injection system (4) also includes a vacuum tube (403), a solenoid valve (404) and a vacuum chamber (405). The vacuum tube (403) is connected to the vacuum chamber (405). The solenoid valve (404) is installed on the vacuum tube (403). The vacuum clamp (401) has a vacuum chamber (405) inside. The vacuum clamp (401) is connected to the vacuum tube (403). The solenoid valve (404) is installed on one end surface of the vacuum tube (403).

6. The high-precision sealing device for lithium batteries according to claim 5, characterized in that: The vacuum channel (508) is connected to the vacuum tube (403), and the vacuum channel (508) is used to guide the gas generated in the injection area into the vacuum chamber (405) for discharge.

7. The high-precision sealing device for lithium batteries according to claim 1, characterized in that: The injection tube (502) is provided with a negative pressure defoaming assembly (6). The negative pressure defoaming assembly (6) includes a negative pressure regulating tube (601), a hydraulic rod (602), a piston (603), and a back pressure air tube (604). The negative pressure regulating tube (601) is connected to the outer surface of the injection tube (502), and a hydraulic rod (602) is fixedly installed on one end surface of the negative pressure regulating tube (601).

8. The high-precision sealing device for lithium batteries according to claim 7, characterized in that: A piston (603) is mounted on one end surface of the hydraulic rod (602). The outer surface of the piston (603) is in contact with the inner wall of the negative pressure regulating pipe (601). A back pressure pipe (604) is connected to the outer side of the negative pressure regulating pipe (601). The negative pressure regulating pipe (601) is connected to the vacuum pipe (403). When the hydraulic rod (602) drives the piston (603) to move, it can adjust the negative pressure state in the vacuum channel (508).

9. A high-precision sealing device for lithium batteries according to claim 1, characterized in that: The bottom end of the vacuum clamp (401) is provided with a sealing assembly (7), which includes a sealing ring (701), an electromagnet (702), a sealing gasket (703), and a slot (704). The bottom surface of the vacuum clamp (401) is equipped with an electromagnet (702), and the outer surface of the liquid injection tube (502) has two slots (704). The outer surfaces of the two slots (704) are movably equipped with a sealing ring (701).

10. A high-precision sealing device for a lithium battery according to claim 9, characterized in that: The bottom surface of the sealing ring (701) is provided with a sealing gasket (703) for quick positioning and sealing between the battery filling ports.

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