Lithium battery electrolyte injection system based on plunger type pneumatic control
The lithium battery electrolyte injection system controlled by a plunger-type pneumatic system solves the problems of injection volume fluctuation and lithium salt crystallization in traditional injection systems, achieving precise injection and efficient resource utilization, reducing maintenance costs, and improving lithium battery production efficiency and quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-03-03
AI Technical Summary
Traditional lithium battery electrolyte injection systems suffer from problems such as large fluctuations in injection volume, easy retention of air bubbles in the electrolyte, poor adaptability to high-viscosity electrolytes, high maintenance costs, lithium salt crystallization leading to jamming failures and raw material waste, making it difficult to meet the high standards required by the lithium battery industry.
The lithium battery electrolyte injection system, which adopts plunger-type pneumatic control, achieves precise injection and closed-loop recovery through the reciprocating motion of the plunger in the sleeve and the gas protection mechanism. Combined with the inert protective gas to isolate air contact, it prevents lithium salt crystallization and reduces raw material loss.
It improves injection accuracy and equipment stability, reduces injection volume deviation, lowers maintenance costs and raw material waste, and enhances resource utilization and production efficiency.
Smart Images
Figure CN223967363U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lithium batteries, specifically relating to a lithium battery electrolyte injection system based on plunger-type pneumatic control. Background Technology
[0002] As a core component of modern energy storage, the precise injection of electrolyte is crucial in the manufacturing process of lithium batteries. The electrolyte is the medium for ion transport inside the battery, and its injection accuracy and reliability directly affect the capacity, cycle life, and safety performance of the lithium battery.
[0003] Traditional electrolyte injection processes often employ a negative pressure backflow method, where the inside of the battery compartment is evacuated to create a negative pressure, and the electrolyte is automatically drawn into the compartment using the pressure difference. While this method achieves automated injection, it has significant drawbacks in practical applications: for example, insufficient precision in negative pressure control leads to fluctuations in the injection volume, air bubbles are easily left in the electrolyte, and it has poor adaptability to high-viscosity electrolytes. Furthermore, the equipment relies on a complex pneumatic system, resulting in high maintenance costs and difficulty in meeting the demands of large-scale production.
[0004] Before electrolyte injection begins, if the injection system is in standby mode or experiences a brief shutdown for other reasons, the electrolyte solvent stagnating in the injection pump's internal cavity gradually evaporates. After solvent evaporation, the lithium salt concentration in the electrolyte increases, leading to crystal precipitation. The gradual accumulation of crystals eventually causes the injection pump to jam. While forced emptying via the draining system during standby can temporarily suppress crystallization and maintain normal operation of the injection system, it comes at the cost of sacrificing raw material utilization, resulting in a large amount of electrolyte being directly discharged as waste. These problems make existing injection systems unable to meet the high standards of the lithium battery industry in terms of accuracy, reliability, and economy. Utility Model Content
[0005] To address the aforementioned problems in the existing technology, this utility model provides a lithium battery electrolyte injection system based on plunger-type pneumatic control. The technical problem to be solved by this utility model is achieved through the following technical solution:
[0006] This invention provides a lithium battery electrolyte injection system based on plunger-type pneumatic control, comprising: a sleeve, a plunger, an inlet pipe, an outlet pipe, an adjustable cylinder, a recovery pipe, a switching valve, a storage tank, and a gas cylinder. The first end of the plunger is located outside the sleeve and connected to the adjustable cylinder; the second end of the plunger is slidably connected to the sleeve, isolating the inside of the sleeve into a first cavity and a second cavity away from the first end of the plunger. As the plunger slides, the internal spaces of the first cavity and the second cavity can be interchanged. The inlet pipe, the outlet pipe, and the recovery pipe are spaced apart and connected to... The second cavity; the inlet pipe, the recovery pipe, and the storage tank are connected by the switching valve; the gas cylinder stores inert protective gas, which is connected to the second cavity through a gas pipeline; during liquid injection, the electrolyte enters the second cavity from the storage tank through the inlet pipe, and the electrolyte in the second cavity is discharged to the battery cell for liquid injection through the outlet pipe; during shutdown, the electrolyte in the second cavity is discharged through the recovery pipe and enters the storage tank or the inlet pipe through the switching valve, and the protective gas in the gas cylinder enters the second cavity through a gas pipeline.
[0007] In one embodiment of this utility model, the inner wall of the sleeve is provided with a diamond-like coating.
[0008] In one embodiment of this utility model, the second end of the plunger is provided with a plurality of sealing rings spaced apart, for sealing the second end of the plunger with the inner wall of the sleeve.
[0009] In one embodiment of this utility model, the liquid inlet pipe forms a liquid inlet passage, and the liquid inlet pipe is provided with a liquid inlet solenoid valve for controlling the opening and closing of the liquid inlet passage.
[0010] In one embodiment of this utility model, the liquid outlet pipe forms a liquid outlet passage, and a liquid outlet solenoid valve is provided on the liquid outlet pipe to control the opening and closing of the liquid outlet passage.
[0011] In one embodiment of this utility model, the recycling pipe forms a recycling passage, and a recycling solenoid valve is provided on the recycling pipe to control the opening and closing of the recycling passage.
[0012] In one embodiment of this utility model, the switching valve is a two-way three-way switching valve, used to control the electrolyte discharged from the second cavity to enter the storage tank or the inlet pipe.
[0013] In one embodiment of this utility model, the inlet pipe, the outlet pipe, and the recovery pipe are all made of polytetrafluoroethylene (PTFE) pipe.
[0014] In one embodiment of this utility model, when the second end of the plunger moves toward the second cavity, the pressure inside the second cavity increases, pushing the electrolyte into the battery cell through the outlet pipe; when the second end of the plunger moves toward the first cavity, the pressure inside the second cavity decreases, forming a negative pressure, and the electrolyte is drawn into the second cavity through the inlet pipe.
[0015] In one embodiment of this utility model, during the liquid injection process, the liquid outlet solenoid valve is opened to allow the electrolyte to flow, and the liquid inlet solenoid valve is closed to prevent backflow; during the liquid aspiration process, the liquid outlet solenoid valve is closed, and the liquid inlet solenoid valve is opened, allowing the electrolyte to enter the second cavity; when the machine is stopped, the recovery solenoid valve is opened, and both the liquid inlet solenoid valve and the liquid outlet solenoid valve are closed, allowing the electrolyte in the second cavity to be discharged from the second cavity.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] This utility model discloses a lithium battery electrolyte injection system based on plunger-type pneumatic control. Through the coordinated design of the plunger-type pneumatic control structure and the gas protection mechanism, it achieves dual optimization of improved electrolyte injection accuracy and equipment operational stability. The reciprocating motion of the plunger within the sleeve effectively reduces injection volume deviation compared to a negative pressure backflow injection system. During shutdown, the recovery pipeline and switching valve work together to return residual electrolyte in the second cavity to the storage tank, or it can be re-injected through the inlet pipeline. An inert protective gas is introduced into the second cavity from the gas storage cylinder, isolating it from air contact and inhibiting solvent evaporation, thus preventing lithium salt crystallization. Simultaneously, a closed-loop electrolyte recovery path is formed through the recovery pipeline, significantly reducing raw material loss and improving resource utilization.
[0018] This invention relates to a lithium battery electrolyte injection system based on plunger-type pneumatic control. An adjustable cylinder drives the plunger to inject electrolyte. By sliding the plunger within the sleeve, the pressure in the second cavity of the sleeve is altered, achieving precise electrolyte intake and injection. The high-precision reciprocating motion of the plunger within the sleeve, combined with solenoid valve control, ensures flow control during the injection process, solving the problem of precise electrolyte volume control in traditional technologies. Furthermore, the plunger structure is simple, low-cost, and easy to maintain, significantly reducing production costs and equipment maintenance difficulty, and improving the efficiency and quality of lithium battery production.
[0019] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of a lithium battery electrolyte injection system based on plunger-type pneumatic control provided by an embodiment of the present invention;
[0021] Figure 2 This is a schematic diagram (injection state) of a lithium battery electrolyte injection system based on plunger-type pneumatic control provided in an embodiment of this utility model.
[0022] Figure 3 This is a schematic diagram (reset state) of a lithium battery electrolyte injection system based on plunger-type pneumatic control provided in an embodiment of this utility model.
[0023] Icons: 100-Sheath; 200-Plunger; 210-Sealing ring; 300-Inlet pipe; 310-Inlet solenoid valve; 400-Outlet pipe; 410-Outlet solenoid valve; 500-Adjustable cylinder; 600-Recovery pipe; 610-Recovery solenoid valve; 700-Diverter valve; 800-Storage tank; 900-Gas cylinder. Detailed Implementation
[0024] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a lithium battery electrolyte injection system based on plunger-type pneumatic control proposed in accordance with this utility model.
[0025] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the specific embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve the intended purpose. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the technical solution of this utility model.
[0026] Example 1
[0027] Traditional negative pressure reverse suction electrolyte injection systems exhibit significant fluctuations in injection volume, making it difficult to meet the requirements of high-precision injection processes. Furthermore, during standby or shutdown, residual electrolyte evaporates, leading to lithium salt crystallization and causing jamming. Forced drainage is required to suppress crystallization, resulting in substantial electrolyte waste. Therefore, this embodiment provides a lithium battery electrolyte injection system based on plunger-type pneumatic control, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of a lithium battery electrolyte injection system based on plunger-type pneumatic control, provided by an embodiment of this utility model.
[0028] In this embodiment, the lithium battery electrolyte injection system based on plunger-type pneumatic control includes: a sleeve 100, a plunger 200, an inlet pipe 300, an outlet pipe 400, an adjustable cylinder 500, a recovery pipe 600, a switching valve 700, a storage tank 800, and a gas cylinder 900. The first end of the plunger 200 is located outside the sleeve 100 and connected to the adjustable cylinder 500; the second end of the plunger 200 is slidably connected to the sleeve 100, isolating the interior of the sleeve 100 into a third... The system includes a first cavity and a second cavity at the first end away from the plunger 200, and the internal spaces of the first cavity and the second cavity can be interchanged as the plunger 200 slides; the inlet pipe 300, the outlet pipe 400 and the recovery pipe 600 are spaced apart and connected to the second cavity respectively; the inlet pipe 300, the recovery pipe 600 and the storage tank 800 are connected through a switching valve 700; the gas cylinder 900 stores inert protective gas, and the inert protective gas is connected to the second cavity through a gas pipeline.
[0029] Specifically, during electrolyte injection, the electrolyte enters the second cavity from the storage tank 800 through the inlet pipe 300, and the electrolyte in the second cavity is discharged to the battery cell for electrolyte injection through the outlet pipe 400; during shutdown, the electrolyte in the second cavity is discharged through the recovery pipe 600 and enters the storage tank 800 or the inlet pipe 300 through the switching valve 700, and the protective gas in the gas cylinder 900 enters the second cavity through the gas pipeline.
[0030] For example, the adjustable cylinder 500 is an actuator that drives the piston 200 to move. It controls the reciprocating motion of the piston 200 by compressed air, and its adjustable design allows for precise control of the movement speed and position of the piston 200.
[0031] It is worth noting that the lithium battery electrolyte injection system based on plunger-type pneumatic control in this embodiment achieves dual optimization of improved electrolyte injection accuracy and equipment operational stability through the coordinated design of the plunger-type pneumatic control structure and the gas protection mechanism. The reciprocating motion of the plunger 200 within the sleeve 100 effectively reduces injection volume deviation compared to a negative pressure backflow injection system. During shutdown, the recovery pipeline 600 and the switching valve 700 work together to return the residual electrolyte in the second cavity to the storage tank 800, or continue to inject it again through the inlet pipeline 300. The gas storage cylinder fills the second cavity with inert protective gas, isolating it from air contact and inhibiting solvent evaporation, thus preventing lithium salt crystallization. Simultaneously, the closed-loop electrolyte recovery path formed by the recovery pipeline 600 significantly reduces raw material loss and improves resource utilization.
[0032] In an optional embodiment, the sleeve 100 and the plunger 200 form a sealed space, and a diamond-like carbon coating is provided on the inner wall of the sleeve 100. Existing injection pumps commonly use a rotating ceramic valve body structure to control the injection process; however, long-term friction between the valve core and valve body can easily create micro-gaps, leading to leakage. Leakage not only contaminates the working environment but also introduces air bubbles, causing errors in the injection volume. Simultaneously, solutes in the electrolyte easily crystallize on the valve body surface, clogging the flow channel or jamming the valve core, resulting in frequent downtime for maintenance and impacting production efficiency. Therefore, a diamond-like carbon coating is used to improve wear resistance and sealing performance, ensuring that the electrolyte does not leak when the plunger 200 moves.
[0033] In an optional embodiment, the second end of the plunger 200 is provided with a plurality of sealing rings 210 at intervals to seal the second end of the plunger 200 and the inner wall of the sleeve 100 to ensure that the electrolyte does not leak during movement.
[0034] For example, since the second end of the plunger 200 is in direct contact with the electrolyte, the liquid is pushed or drawn by the movement of the plunger 200. Therefore, the plunger 200 can be made of corrosion-resistant materials to adapt to different electrolyte chemical properties, such as polytetrafluoroethylene (PTFE) or ceramic-coated stainless steel. PTFE has excellent chemical corrosion resistance and low coefficient of friction, making it suitable for electrolyte environments; ceramic-coated stainless steel (such as 316L stainless steel with AlO sprayed on the surface) can enhance wear resistance and corrosion resistance, extending service life.
[0035] It is worth noting that the lithium battery electrolyte injection system based on plunger-type pneumatic control in this embodiment eliminates leakage by adopting a corrosion-resistant coating and sealing design, avoids crystallization caused by electrolyte leakage, and thus avoids pump jamming, ensuring the stability and accuracy of the injection process.
[0036] In one optional embodiment, the inlet pipe 300 forms an inlet passage, and an inlet solenoid valve 310 is provided on the inlet pipe 300 to control the opening and closing of the inlet passage. The outlet pipe 400 forms an outlet passage, and an outlet solenoid valve 410 is provided on the outlet pipe 400 to control the opening and closing of the outlet passage. The recovery pipe 600 forms a recovery passage, and a recovery solenoid valve 610 is provided on the recovery pipe 600 to control the opening and closing of the recovery passage.
[0037] For example, the solenoid valve is made of stainless steel or other corrosion-resistant materials to adapt to the chemical properties of the electrolyte. For instance, the valve body can be made of 316L stainless steel, and the sealing surface can be made of fluororubber. 316L stainless steel is resistant to electrolyte corrosion, while fluororubber has high chemical resistance in organic solvents, preventing leakage due to seal failure.
[0038] For example, the inlet pipe 300, outlet pipe 400, and recovery pipe 600 all need to have good sealing and corrosion resistance to prevent electrolyte leakage and corrosion. For instance, polytetrafluoroethylene (PTFE) pipes can be used for the inlet pipe 300, outlet pipe 400, and recovery pipe 600 to reduce the risk of corrosion.
[0039] The principle is that the solenoid valve is used to control the opening and closing of the passage. The inlet solenoid valve 310, the outlet solenoid valve 410 and the recovery solenoid valve 610 are used to control different passages, that is, to control the flow path of different fluids. The valves are opened and closed by energizing and de-energizing the solenoid coil.
[0040] In an optional embodiment, the switching valve 700 is a two-way three-way switching valve. The switching valve 700 has three ports, which are respectively connected to the recovery pipe 600, the storage tank 800 and the inlet pipe 300. It is used to select and control the electrolyte discharged from the second cavity to enter the storage tank 800 or the inlet pipe 300. At the same time, it can also prevent backflow, realize the recycling of electrolyte and improve energy utilization efficiency.
[0041] like Figures 1 to 3 As shown, Figure 2 This is a schematic diagram (injection state) of a lithium battery electrolyte injection system based on plunger-type pneumatic control provided in an embodiment of this utility model. Figure 3 This is a schematic diagram (reset state) of a lithium battery electrolyte injection system based on plunger-type pneumatic control provided in an embodiment of this utility model.
[0042] The working principle of the lithium battery electrolyte injection system based on plunger pneumatic control in this embodiment is as follows: when the second end of the plunger 200 moves towards the second cavity, the pressure in the second cavity increases, pushing the electrolyte into the battery cell through the outlet pipe 400; when the second end of the plunger 200 moves towards the first cavity, the pressure in the second cavity decreases, forming a negative pressure, and the electrolyte is drawn into the second cavity through the inlet pipe 300.
[0043] Specifically, the plunger 200 moves within the sleeve 100. When subjected to pressure, the plunger 200 moves in the opposite direction. This linear motion and the resulting pressure change are the basis for liquid injection and extraction. Specifically, the movement of the plunger 200 changes the pressure within the sleeve 100, thereby controlling the flow of the electrolyte. When the second end of the plunger 200 moves to the left, the pressure in the second cavity increases, pushing the electrolyte through the outlet pipe 400 into the battery cell. When the second end of the plunger 200 moves to the right, the pressure in the second cavity decreases, creating a negative pressure, causing the electrolyte to be drawn into the second cavity through the inlet pipe 300.
[0044] Furthermore, during the injection process, the outlet solenoid valve 410 is opened to allow the electrolyte to flow, and the inlet solenoid valve 310 is closed to prevent backflow; during the suction process, the outlet solenoid valve 410 is closed, the inlet solenoid valve 310 is opened, and the electrolyte enters the second cavity.
[0045] Specifically, during the electrolyte injection process, the adjustable cylinder 500 drives the plunger 200 to move to the left, and as the plunger 200 moves to the left, the electrolyte in the sleeve 100 is squeezed to the left; at the same time, the outlet solenoid valve 410 remains open to allow the electrolyte to flow; the inlet solenoid valve 310 remains closed to prevent backflow; due to the opening of the outlet solenoid valve 410, the electrolyte is injected into the battery cell through the outlet pipe 400.
[0046] During the liquid aspiration process, the adjustable cylinder 500 drives the plunger 200 to move to the right, and as the plunger 200 moves to the right, the electrolyte in the sleeve 100 is squeezed to the right; at the same time, the outlet solenoid valve 410 remains closed to prevent the electrolyte from flowing out of the battery cell; the inlet solenoid valve 310 remains open to allow the electrolyte to flow in from the electrolyte tank; due to the opening of the inlet solenoid valve 310, the electrolyte is drawn into the second cavity through the inlet pipe 300.
[0047] Furthermore, during shutdown or standby, forced drainage is required to suppress crystallization. At this time, the recovery solenoid valve 610 opens, while the inlet solenoid valve 310 and outlet solenoid valve 410 close. The electrolyte in the second cavity is drained and then controlled by the switching valve 700 to enter the storage tank 800 or the inlet pipe 300. Next, after the electrolyte is drained through the recovery pipe 600, the inert protective gas in the gas cylinder 900 enters the second cavity through the gas pipeline. When resetting and restarting the injection process, the adjustable cylinder 500 drives the plunger 200 to compress the second cavity, expelling air into the gas cylinder 900. After the plunger 200 resets, the inlet solenoid valve 310 and outlet solenoid valve 410 are opened to repeat the injection process.
[0048] For example, the inert protective gas is a chemically stable gas that does not readily react with the electrolyte, such as nitrogen or argon. By injecting the inert protective gas into the second cavity, the air surrounding the residual electrolyte is replaced, thereby isolating oxygen and preventing the solvent in the electrolyte from evaporating and forming lithium salt crystals.
[0049] It is worth noting that the lithium battery electrolyte injection system based on plunger-type pneumatic control in this embodiment uses an adjustable cylinder 500 to drive the plunger 200 for electrolyte injection. By driving the plunger 200 to slide within the sleeve 100, the pressure in the second cavity within the sleeve 100 is changed, achieving precise intake and injection of electrolyte. The high-precision reciprocating motion of the plunger 200 within the sleeve 100, combined with solenoid valve control, ensures flow control during the injection process, solving the problem of precise electrolyte volume control in traditional technologies. Simultaneously, the plunger 200 has a simple structure, low cost, and is easy to maintain, significantly reducing production costs and equipment maintenance difficulty, and improving the efficiency and quality of lithium battery production.
[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.
[0051] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.
Claims
1. A lithium battery electrolyte injection system based on plunger-type pneumatic control, characterized in that, include: The system includes a sleeve (100), a plunger (200), an inlet pipe (300), an outlet pipe (400), an adjustable cylinder (500), a recovery pipe (600), a switching valve (700), a storage tank (800), and a gas cylinder (900). The first end of the plunger (200) is located outside the sleeve (100) and connected to the adjustable cylinder (500); the second end of the plunger (200) is slidably connected to the sleeve (100) and isolates the inside of the sleeve (100) into a first cavity and a second cavity away from the first end of the plunger (200), and as the plunger (200) slides, the internal spaces of the first cavity and the second cavity can be converted to each other; The inlet pipe (300), the outlet pipe (400), and the recovery pipe (600) are spaced apart and connected to the second cavity respectively; the inlet pipe (300), the recovery pipe (600), and the storage tank (800) are connected through the switching valve (700); the gas cylinder (900) stores inert protective gas, which is connected to the second cavity through a gas pipeline; During electrolyte injection, the electrolyte enters the second cavity from the storage tank (800) through the inlet pipe (300), and the electrolyte in the second cavity is discharged to the battery cell through the outlet pipe (400) for electrolyte injection; When the machine is shut down, the electrolyte in the second cavity is discharged through the recovery pipe (600) and enters the storage tank (800) or the inlet pipe (300) through the switching valve (700). The protective gas in the gas storage bottle (900) enters the second cavity through the gas pipeline.
2. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 1, characterized in that, The inner wall of the sleeve (100) is provided with a diamond-like coating.
3. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 1, characterized in that, The second end of the plunger (200) is provided with a plurality of sealing rings (210) spaced apart, for sealing the second end of the plunger (200) with the inner wall of the sleeve (100).
4. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 1, characterized in that, The liquid inlet pipe (300) forms a liquid inlet passage, and the liquid inlet pipe (300) is equipped with a liquid inlet solenoid valve (310) for controlling the opening and closing of the liquid inlet passage.
5. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 4, characterized in that, The liquid outlet pipe (400) forms a liquid outlet passage, and a liquid outlet solenoid valve (410) is provided on the liquid outlet pipe (400) to control the opening and closing of the liquid outlet passage.
6. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 5, characterized in that, The recycling pipe (600) forms a recycling passage, and a recycling solenoid valve (610) is provided on the recycling pipe (600) to control the opening and closing of the recycling passage.
7. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 1, characterized in that, The switching valve (700) is a two-way three-way switching valve, used to control the electrolyte discharged from the second cavity to enter the storage tank (800) or the inlet pipe (300).
8. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 1, characterized in that, The inlet pipe (300), the outlet pipe (400), and the recovery pipe (600) are all made of polytetrafluoroethylene (PTFE).
9. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 6, characterized in that, When the second end of the plunger (200) moves toward the second cavity, the pressure inside the second cavity increases, pushing the electrolyte into the battery cell through the outlet pipe (400); when the second end of the plunger (200) moves toward the first cavity, the pressure inside the second cavity decreases, forming a negative pressure, and the electrolyte is drawn into the second cavity through the inlet pipe (300).
10. The lithium battery electrolyte injection system based on plunger-type pneumatic control according to claim 9, characterized in that, During the injection process, the outlet solenoid valve (410) is opened to allow electrolyte flow, and the inlet solenoid valve (310) is closed to prevent backflow; during the suction process, the outlet solenoid valve (410) is closed, and the inlet solenoid valve (310) is opened, allowing electrolyte to enter the second cavity; when the machine is stopped, the recovery solenoid valve (610) is opened, and both the inlet solenoid valve (310) and the outlet solenoid valve (410) are closed, allowing electrolyte in the second cavity to be discharged from the second cavity.