Integrated Device for Vacuum Injection and Bubble Elimination of Lithium Battery Electrolyte

Abstract

The present invention provides an integrated device for vacuum injection and bubble elimination of lithium battery electrolytes, which relates to the field of new energy technologies and includes: a vacuum operation chamber, a liquid injection device, a moving device, a battery fixing device, a liquid injection pump, a three-stage vacuum chamber, and a vacuum pump group. The liquid injection device, the moving device, the battery fixing device, the liquid injection pump, the three-stage vacuum chamber, and the vacuum pump group are all installed and fixed in the vacuum operation chamber. The battery fixing device is used to fix the battery. The moving device controls the liquid injection device to move to the corresponding position of the battery. The inlet of the liquid injection pump is connected to the electrolyte storage tank, the outlet of the liquid injection pump is connected to the inlet of the three-stage vacuum chamber, the outlet of the three-stage vacuum chamber is connected to the inlet of the liquid injection device, and the vacuum pump group provides a vacuum environment for the vacuum operation chamber and the three-stage vacuum chamber. This device can effectively eliminate the bubbles in the battery electrolyte and avoid the adverse effects of bubbles on the battery performance.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy, and particularly to an integrated device for vacuum injection and bubble elimination of lithium battery electrolyte. Background Art

[0002] With the development of high-energy-density lithium batteries towards high-nickel ternary, silicon-based anode and solid-state battery systems, the electrolyte injection process faces unprecedented challenges. Although traditional vacuum injection technology can partially remove dissolved gases, when dealing with high-viscosity electrolytes (such as fluorine-containing solvent systems) or electrodes with complex pore structures, microbubbles with sub-micron size are often left at the interface due to the temporal contradiction between dynamic wetting and gas removal. Such microscopic defects are prone to cause local lithium dendrite growth during cycling, severely restricting the rate performance and cycle life of the battery.

[0003] In the prior art, mainly relying on a single pressure gradient to drive gas discharge, the viscous drag effect of high-viscosity liquids is prone to occur under low vacuum, which instead exacerbates the retention of microbubbles. Although the improved scheme with ultrasonic assistance can break some bubbles, due to the lack of parameter coupling between the vacuum field and the sound field, it causes the risk of sound energy attenuation and thermal runaway in the closed cavity, and it is difficult to achieve stable defoaming. In addition, for the pre-injection process of sulfide solid-state batteries, the existing equipment cannot synchronously solve the contradiction between the surface energy matching of solid electrolytes and the penetration depth of liquid precursors, resulting in nano-scale air gaps at the heterogeneous interface, significantly increasing the interface impedance.

[0004] More critically, current multi-stage processing equipment mostly adopts a discrete architecture, lacking coordinated control between the vacuum system, ultrasonic module and liquid injection execution unit, resulting in dynamic mismatch of process parameters (vacuum degree, ultrasonic frequency, liquid injection rate). This mechanically stacked design not only increases the volume of the equipment, but also causes energy dissipation due to pressure backflow between stages, and it is difficult to meet the beat requirements of high-precision power battery manufacturing. How to achieve cross-scale (millimeter scale → nanometer scale) bubble removal in a limited cavity space and establish an intelligent control mechanism for multi-physical field coupling has become the core technical problem for breaking through the bottleneck of high-end lithium battery manufacturing. Summary of the Invention

[0005] In order to solve the technical problem that the existing single pressure gradient drives gas discharge, resulting in the viscous drag effect of high-viscosity liquids under low vacuum, which instead exacerbates the retention of microbubbles, the present invention provides an integrated device for vacuum injection and bubble elimination of lithium battery electrolyte.

[0006] The technical solutions provided by the embodiments of the present invention are as follows:

[0007] The integrated device for vacuum injection and bubble elimination of lithium battery electrolyte provided by the embodiments of the present invention includes: a vacuum operation chamber, a liquid injection device, a moving device, a battery fixing device, a liquid injection pump, a three-stage vacuum chamber, and a vacuum pump group. The liquid injection device, the moving device, the battery fixing device, the liquid injection pump, the three-stage vacuum chamber, and the vacuum pump group are all installed and fixed in the vacuum operation chamber. The liquid injection device is installed and fixed on the moving device. The battery fixing device is used to fix the battery. The moving device controls the liquid injection device to move to the corresponding position of the battery. The inlet of the liquid injection pump is connected to the electrolyte storage tank, the outlet of the liquid injection pump is connected to the inlet of the three-stage vacuum chamber, the outlet of the three-stage vacuum chamber is connected to the inlet of the liquid injection device, and the vacuum pump group provides a vacuum environment for the vacuum operation chamber and the three-stage vacuum chamber. All the connections are sealed connections;

[0008] The three-stage vacuum chamber includes a first-stage chamber, a second-stage chamber, and a third-stage chamber. The vacuum degree in the first-stage chamber is 50 - 100 kPa, the vacuum degree in the second-stage chamber is 10 - 50 kPa, and the vacuum degree in the third-stage chamber is less than 5 kPa;

[0009] A spiral flow channel, a porous degassing device, and a preheating device are arranged in the first-stage chamber. A piezoelectric ceramic array and a buffer partition are arranged in the second-stage chamber. A pulse negative pressure generator and a porous liquid injection plate are arranged in the third-stage chamber.

[0010] The beneficial effects brought by the technical solutions provided by the embodiments of the present invention at least include:

[0011] In the present invention, the device can effectively eliminate the bubbles in the battery electrolyte, avoiding the adverse effects of bubbles on the battery performance. By using the three-stage vacuum chamber to reduce the vacuum degree in stages and combining the precise control of ultrasonic crushing and pulse negative pressure, the bubbles can be efficiently removed at different stages. At the same time, by using the porous liquid injection plate and the heating component, the generation of local turbulent bubbles is effectively avoided, and uniform electrolyte injection is achieved. The device improves the efficiency and consistency of battery liquid injection, ensuring the long-term stability and high performance of the battery. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0013] Figure 1 It is a schematic structural diagram of the liquid injection device, the moving device, and the battery fixing device of the integrated device for vacuum injection and bubble elimination of lithium battery electrolyte provided by the embodiments of the present invention;

[0014] Figure 2Front view of the integrated device for vacuum injection and bubble elimination of lithium battery electrolyte provided by the embodiment of the present invention, with a vacuum operation chamber and a three-stage vacuum chamber;

[0015] Figure 3 Partial enlarged view of the three-stage vacuum chamber of the integrated device for vacuum injection and bubble elimination of lithium battery electrolyte provided by the embodiment of the present invention;

[0016] Figure 4 Cross-sectional view of the three-stage vacuum chamber of the integrated device for vacuum injection and bubble elimination of lithium battery electrolyte provided by the embodiment of the present invention;

[0017] Figure 5 Three-dimensional structure schematic diagram of the spiral flow channel of the integrated device for vacuum injection and bubble elimination of lithium battery electrolyte provided by the embodiment of the present invention;

[0018] Figure 6 Three-dimensional structure schematic diagram of the three-stage vacuum chamber of the integrated device for vacuum injection and bubble elimination of lithium battery electrolyte provided by the embodiment of the present invention.

[0019] [Reference numerals]

[0020] 1 - Vacuum operation chamber, 2 - Liquid injection device, 3 - Moving device, 4 - Battery fixing device, 5 - Valve, 6 - Three-stage vacuum chamber, 61 - First-stage chamber, 611 - Spiral flow channel, 612 - Porous degassing device, 613 - Preheating device, 62 - Second-stage chamber, 621 - Piezoelectric ceramic array, 622 - Buffer layer, 63 - Third-stage chamber, 631 - Pulse negative pressure generator, 631A - High-speed solenoid valve, 631B - Buffer tank, 632 - Porous liquid injection plate, 7 - Vacuum pump group, 71 - Rotary vane vacuum pump, 72 - Roots pump, 73 - Turbomolecular pump.

[0021] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present invention to this specific structure, device and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments. Detailed implementation manners

[0022] Next, the technical solutions in the present invention will be described with reference to the accompanying drawings. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0023] It should be noted that in the specification, terms such as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Additionally, when describing a specific feature, structure, or characteristic in combination with an embodiment, implementing such a feature, structure, or characteristic in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0024] Generally, terms can be understood at least in part from their use in context. For example, at least in part depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood to not necessarily be intended to convey a set of exclusive factors, but rather, at least in part depending on the context, to allow for the existence of other factors that may not be explicitly described.

[0025] It can be understood that the meanings of "on", "above", and "over" in the present invention should be interpreted in the broadest manner such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0026] Furthermore, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. may be used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the figures. Spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the figures. The device may be oriented in other ways, and the spatial relative descriptive terms used herein may be interpreted accordingly.

[0027] Such as Figures 1 to 6As shown, an embodiment of the present invention provides an integrated device for vacuum injection and bubble elimination of a lithium battery electrolyte. In this device, a vacuum operation chamber 1 and a three-stage vacuum chamber 6 cooperate with each other through a sealed connection. The vacuum operation chamber 1 provides an overall operating environment, while the three-stage vacuum chamber 6 is responsible for eliminating bubbles in the electrolyte by gradually reducing the vacuum degree. The three-stage vacuum chamber 6 consists of a first-stage chamber 61, a second-stage chamber 62, and a third-stage chamber 63, and their vacuum degrees decrease in sequence: the first-stage chamber 61 is maintained at 50 - 100 kPa, the second-stage chamber 62 is at 10 - 50 kPa, and the vacuum degree of the third-stage chamber 63 is less than 5 kPa. By setting different vacuum degrees in the third-stage chamber 63, the decomposition and removal process of bubbles can be effectively controlled.

[0028] The liquid injection device 2 is installed on a mobile device 3, and the mobile device 3 controls the position of the liquid injection device 2 so that it can accurately move to the corresponding position of the battery for liquid injection. This design can ensure that the liquid injection device 2 is always aligned with the liquid inlet of the battery, thereby achieving precise injection of the electrolyte and bubble elimination.

[0029] The battery fixing device 4 is designed to stabilize the battery and prevent the movement or deviation of the battery during the liquid injection process. Once the battery is fixed, the liquid injection device 2 can accurately inject the electrolyte through the mobile device 3, ensuring that the position of the battery does not change during the liquid injection process and avoiding misoperation.

[0030] The inlet of the liquid injection pump is connected to the electrolyte storage tank, and it is responsible for sending the electrolyte through the outlet into the three-stage vacuum chamber 6. During the liquid injection process, the electrolyte passes through the three-stage vacuum chamber 6, and after the action of the gradually reduced vacuum environment, the bubbles are gradually removed and finally flow into the battery interior.

[0031] A pulse negative pressure generator 631 and a porous liquid injection plate 632 are equipped in the three-stage vacuum chamber 6. The pulse negative pressure generator 631 is installed in the third-stage chamber 63 through a flexible connection and is connected to the porous liquid injection plate 632 through an inlet. During operation, the pulse negative pressure generated by the pulse negative pressure generator 631 helps to accelerate the discharge of bubbles in the electrolyte. At the same time, through the porous liquid injection plate 632, the electrolyte can be evenly distributed inside the battery.

[0032] By gradually reducing the vacuum degree in the three-stage vacuum chamber 6, first, the electrolyte is heated in the first-stage chamber 61 through a spiral flow channel 611 to remove most of the bubbles, then the piezoelectric ceramic array 621 and the buffer layer 622 are used in the second-stage chamber 62 to further refine the bubbles, and finally, the pulse negative pressure generator 631 is used in the third-stage chamber 63 to completely eliminate the tiny bubbles, ensuring that there is almost no bubble residue in the electrolyte and improving the battery performance.

[0033] The combination of the mobile device 3 and the liquid injection device 2 enables the electrolyte to be accurately injected into each battery, which not only reduces waste but also avoids the phenomenon of uneven electrolyte injection. The use of the porous liquid injection plate 632, combined with the heating component, realizes the uniform distribution of the electrolyte and avoids the problem of turbulent bubbles caused by excessive local flow.

[0034] The vacuum pump group 7 provides a stable vacuum environment for the entire device to ensure that the bubbles in the three-stage vacuum chamber 6 can be quickly removed. At the same time, the exhaust gas is processed through the condensation recovery device, reducing environmental pollution and improving the environmental protection performance of the device.

[0035] In a possible implementation manner, in the primary chamber 61, the spiral flow channel 611 includes a liquid storage part and a spiral part. The electrolyte first flows through the spiral part. Inside the spiral part, the electrolyte experiences a spiral-shaped path, causing the liquid to generate a rotational flow and gradually flowing into the liquid storage part. The spiral part is connected to the inlet of the liquid storage part through a spiral pipe. Such a design helps to further separate the large bubbles in the electrolyte through centrifugal force during the flow process and avoid the bubbles from entering the subsequent processing area.

[0036] The porous degassing device 612 is installed and fixed on the top of the liquid storage part. Its function is to release the gas in the electrolyte through its porous structure. Especially when the liquid enters the liquid storage part, due to the floating of the bubbles, the degassing device can effectively capture and remove the bubbles floating on the liquid surface. The porous degassing device 612 is hermetically connected to the liquid storage part to ensure that its degassing function is not affected by the external environment. At the same time, its connection to the waste recycling device provides an additional resource recycling path.

[0037] The preheating device 613 is installed outside the liquid storage part and the spiral part. The preheating device 613 heats the electrolyte to make its temperature appropriate and have better fluidity, avoiding the problems of too high liquid viscosity or poor bubble solubility at low temperatures. The preheating device 613 is connected to the spiral flow channel 611 to ensure that the heated electrolyte can smoothly enter the spiral part and continue to flow.

[0038] The waste recycling device is installed on the porous degassing device 612. All the gases and waste gases separated from the electrolyte are collected and processed through this device. The waste recycling device is usually equipped with a filter or a condenser to purify or recycle the harmful components in the gas, avoiding pollution and improving the environmental protection performance of the device. The waste recycling device is hermetically connected to the porous degassing device 612 through a pipeline to ensure that the waste gas does not leak.

[0039] The design of the spiral flow channel 611, the porous degassing device 612, the preheating device 613 and the waste recycling device in the primary chamber 61 and their connection achieve efficient electrolyte injection and bubble elimination, significantly improving the performance, fluid control accuracy and environmental protection efficiency of lithium batteries.

[0040] In a possible implementation, the primary chamber 61 is a horizontal cylindrical cavity and is inclined axially at an angle of 5 degrees. The inclined design of the primary chamber 61 positions the liquid storage part at a lower position and the spiral part at a higher position. By the action of gravity, the electrolyte can flow into the liquid storage part through the spiral part. Such a design can help the smooth flow of the electrolyte through natural gravity flow and effectively reduce the resistance during liquid flow. The primary chamber 61 and the spiral part are connected by a pipeline. The design of the spiral part can ensure the necessary rotation and centrifugal force when the electrolyte flows, so that the bubbles in the liquid are effectively separated during the flow.

[0041] A valve 5 is installed at the outlet of the liquid storage part. The valve 5 is connected to the secondary chamber 62. During the liquid injection process, when the electrolyte needs to enter the secondary chamber 62, the valve 5 controls the liquid flow to ensure that the electrolyte can enter the secondary chamber 62 with an appropriate flow rate. This connection design helps to ensure the liquid flow rate and pressure control during the entire liquid injection process and can quickly close the valve 5 after the injection is completed to prevent liquid backflow or leakage.

[0042] The spiral part adopts a double - headed spiral structure. The purpose of this design is to make the electrolyte form a stronger rotational flow during the flow process through the alternating action of the double - spiral flow channel 611, thereby further promoting the separation of bubbles. The cross - section of the flow channel of the double - headed spiral structure is circular, which can more evenly distribute the liquid flow rate and reduce problems such as local over - flow or liquid retention. The spiral part is connected to the inlet of the primary chamber 61 through a fixed connection structure to ensure that the electrolyte can smoothly enter the spiral part, and is accelerated and rotated when passing through the spiral flow channel 611, enhancing the bubble separation efficiency.

[0043] The design of the double - headed spiral structure enables the liquid to experience more spiral rotations during the flow process. This not only helps the liquid to be evenly mixed during the flow process, but also helps the bubbles to quickly separate from the electrolyte through centrifugal force. After the bubbles are separated, they are effectively removed through the porous degassing device 612, preventing the residual bubbles from entering the battery interior, thus improving the performance of the battery.

[0044] The combination of the inclined design of the primary chamber 61, the double - headed spiral structure of the spiral part and the valve 5 control system improves the liquid flow efficiency, the bubble elimination effect, and optimizes the overall performance and production accuracy of the battery.

[0045] In a possible implementation, the secondary chamber 62 is a vertical cylindrical cavity, and the cavity is divided into upper and lower regions by a buffer partition layer 622 inside. The buffer partition layer 622 is installed in the middle of the cavity to play a role in liquid buffering. When the liquid enters from the upper region and passes through the piezoelectric ceramic array 621, uniform vibration can be obtained, thereby effectively eliminating the bubbles in the liquid and ensuring the quality of the electrolyte.

[0046] The piezoelectric ceramic array 621 is installed on the inner side wall of the secondary chamber 62. By applying a voltage, the piezoelectric ceramic array 621 can generate mechanical vibrations. These vibrations can be transmitted through the liquid, thereby promoting the removal of bubbles. The design of the secondary chamber 62 enables the liquid to be maximally affected by the vibrations when passing through the piezoelectric ceramic array 621, ensuring that the bubbles are effectively eliminated.

[0047] An outlet valve 5 is provided at the bottom of the cavity of the secondary chamber 62, and this valve 5 is connected to the tertiary chamber 63. During the injection of the electrolyte, the liquid will flow into the tertiary chamber 63 through this valve 5 when passing through the secondary chamber 62. The opening and closing operation of the valve 5 is managed by an automatic control system to ensure that the flow rate and pressure of the electrolyte when flowing into the tertiary chamber 63 are maintained within an appropriate range, thereby optimizing the effect of electrolyte injection and bubble elimination.

[0048] On the side wall of the cavity of the secondary chamber 62, a viscosity sensor and a sound pressure sensor are fixedly installed. The viscosity sensor monitors the viscosity change of the electrolyte in real time, provides data support, and ensures that the fluidity of the electrolyte meets the requirements. If the viscosity of the electrolyte changes, the injection parameters can be adjusted through the control system. The sound pressure sensor is used to monitor the sound pressure change in the secondary chamber 62 and further analyze the effect of bubble elimination. Through the sound pressure data, it can be judged whether the bubbles are completely eliminated, and the vibration frequency and intensity can be further optimized to achieve the most ideal bubble removal effect.

[0049] Through the coordinated action of precise sensor monitoring and the piezoelectric ceramic array 621, the efficiency and quality of lithium battery electrolyte injection are significantly improved, and the problem that bubbles cannot be completely removed in the traditional injection process is effectively solved.

[0050] In a possible implementation, the tertiary chamber 63 is a cuboid-shaped cavity, and the inner wall of the cavity is coated with an anti-sticking coating. The main purpose of this design is to prevent the electrolyte from adhering to the inner wall of the cavity during the injection process, ensure the smooth flow of the electrolyte, and avoid liquid residue. The presence of the anti-sticking coating can effectively reduce the friction force when the liquid contacts the cavity wall surface, reduce the resistance of the liquid during the injection process, and thus improve the injection efficiency.

[0051] The pulse negative pressure generator 631 is fixedly installed in the cavity of the three-stage cavity 63 through a flexible connector. The flexible connector not only enables the pulse negative pressure generator 631 to be firmly fixed in the cavity, but also effectively avoids unnecessary interference with the negative pressure generator caused by factors such as mechanical vibration. The inlet of the pulse negative pressure generator 631 is fixedly connected to the inlet of the three-stage cavity 63, which ensures that the generated negative pressure can directly act on the electrolyte entering the three-stage cavity 63.

[0052] The pulse negative pressure generator 631 applies a negative pressure to the electrolyte periodically by means of pulse negative pressure, which can further eliminate the bubbles in the electrolyte. The rapid change of the negative pressure causes the volume of the bubbles to change, and finally removes the bubbles from the electrolyte. Inside the three-stage cavity 63, the negative pressure fluctuation generated by the negative pressure generator can effectively cause the tiny bubbles in the electrolyte to aggregate and discharge, ensuring that the electrolyte is completely de-bubbled.

[0053] The anti-sticking coating on the inner wall of the three-stage cavity 63 serves to reduce the frictional force between the electrolyte and the cavity wall. Since the electrolyte usually has strong adhesiveness, especially in the case of high viscosity, the use of the anti-sticking coating greatly reduces the adhesion of the electrolyte during injection, avoids the retention of the liquid on the inner wall of the cavity or the slowdown of the flow rate, ensures the smooth flow of the electrolyte, and reduces the possibility of bubble residue.

[0054] The combination of the three-stage cavity 63 and the pulse negative pressure generator 631, by using technical measures such as anti-sticking coating and negative pressure pulse, not only improves the efficiency of electrolyte injection and bubble elimination, but also ensures the stability and reliability of the system operation.

[0055] In a possible implementation, the porous liquid injection plate 632 is made of silicon carbide ceramic material because silicon carbide has extremely high corrosion resistance, high temperature resistance and good mechanical strength, can effectively withstand the long-term erosion of the electrolyte, and maintain stable physical properties. In addition, the porous structure of the silicon carbide ceramic can provide precise pore size control and efficient liquid distribution ability. During design, the pore size distribution of the liquid injection plate is a combination of main pores and auxiliary pores. The main pore diameter is 50 - 200 nanometers (nm), and the pore diameter of the auxiliary pores is 1 - 5 micrometers (μm). This pore size combination can ensure the uniform flow of the electrolyte and also helps to effectively remove the tiny bubbles in the electrolyte. The main pores are smaller, which can achieve efficient and uniform liquid distribution, while the auxiliary pores are used to provide a larger flow rate of liquid injection.

[0056] The porous liquid injection plate 632 is provided with a heating component, which is usually achieved by electric heating. The heating component is closely combined with the porous liquid injection plate 632, enabling the porous liquid injection plate 632 to be uniformly heated during the electrolyte injection process. The heating element usually adopts a resistance wire, a heating film or other suitable heating materials, and the heating temperature is adjusted through an appropriate control system. The heating component is installed at the bottom or surface of the porous liquid injection plate 632, and the heat is evenly distributed to the entire liquid injection plate through a heat conduction structure. The function of this heating mechanism is to prevent the electrolyte from generating a locally excessive flow rate due to uneven temperature during the injection process, thereby causing the formation of turbulence and bubbles.

[0057] During the working process, the electrolyte enters the battery cell of the lithium battery through the porous channels of the liquid injection plate. When the liquid passes through the liquid injection plate, due to the reasonable distribution of the pore diameters, the main pores are responsible for carefully and evenly distributing the liquid, while the auxiliary pores provide a larger flow rate for the liquid. This reasonable pore diameter design helps to achieve efficient and stable liquid distribution, avoiding local excessive flow rate or uneven liquid distribution that may be caused by a single pore diameter. The heating component maintains a constant temperature of the porous liquid injection plate 632, avoiding local overheating or overcooling of the liquid, and thus preventing the generation of turbulence and bubbles.

[0058] The integrated device for vacuum injection and bubble elimination of the lithium battery electrolyte can effectively improve the uniformity, stability and efficiency of the electrolyte injection process, and avoid the negative impact of bubbles and turbulence on the battery performance, thereby ensuring the high performance and long life of the lithium battery.

[0059] In a possible implementation manner, the vacuum pump of the first-stage chamber 61 is the preliminary air extraction device in the system, which is responsible for reducing the air pressure in the entire liquid injection system to a relatively low level before injecting the electrolyte. The air extraction port of the vacuum pump of the first-stage chamber 61 is connected to the first-stage chamber 61. When starting to work, the vacuum pump of the first-stage chamber 61 starts, extracts the air or gas in the first-stage chamber 61, and quickly reduces the pressure of this chamber. In this way, the electrolyte injection process can be carried out in a lower pressure environment, reducing the generation of bubbles and improving the liquid injection efficiency.

[0060] The vacuum pump of the second-stage chamber 62 is used to further reduce the pressure in the first-stage chamber 61 and assist in rapid pressure reduction. The air extraction port of the vacuum pump of the second-stage chamber 62 is connected to the second-stage chamber 62, and the function of the second-stage chamber 62 is to serve as a transition chamber between the first-stage chamber 61 and the third-stage chamber 63. The exhaust port of the vacuum pump of the second-stage chamber 62 is connected to the first-stage chamber 61. This design enables the exhaust pressure of the second-stage chamber 62 to assist the first-stage chamber 61 in accelerating the pressure reduction process. Through this cooperation, the vacuum pump of the second-stage chamber 62 can help the first-stage chamber 61 quickly reach the required low vacuum state in a short time, creating an ideal low air pressure environment for the subsequent liquid injection operation.

[0061] The three-stage chamber 63 vacuum pump is the main vacuum source of the system, responsible for further exhausting the gas within the entire system to ensure that the air pressure within the vacuum operation chamber 1 drops to an extremely low level. The air intake of the three-stage chamber 63 vacuum pump is connected to both the three-stage chamber 63 and the vacuum operation chamber 1, enabling the three-stage chamber 63 to continuously extract vacuum from the entire device and ensuring that the internal pressure of the vacuum operation chamber 1 reaches the required working pressure. The three-stage chamber 63 vacuum pump maintains the efficient air extraction and stable operation of the entire system through its powerful air intake capacity.

[0062] Adopting the design of a three-stage vacuum pump for staged air extraction can significantly improve the working efficiency and stability of the lithium battery electrolyte vacuum injection and bubble elimination system, create a superior low-pressure environment for the electrolyte injection process, effectively remove bubbles, avoid turbulence, and enhance the performance and service life of the battery.

[0063] In a possible implementation, the main function of the condensation recovery device is to collect and recover the vapor or liquid substances in the gas discharged through the exhaust port of the vacuum pump. Since during the lithium battery electrolyte injection process, the electrolyte may volatilize or produce gaseous components, the condensation recovery device can condense these gases into liquids through a cooling system and recover them. The condensation recovery device is usually equipped with cooling devices (such as condenser pipes and condensers) and recovery tanks to store the condensed and recovered liquids.

[0064] The primary chamber 61 vacuum pump is a rotary vane vacuum pump 71, responsible for extracting the gas in the primary chamber 61. The exhaust port of the rotary vane vacuum pump 71 is connected to the condensation recovery device through a pipeline. Since the exhaust of the rotary vane pump usually contains gas and some volatiles, these gases can be condensed and recovered through the condensation recovery device.

[0065] The three-stage chamber 63 vacuum pump is a turbomolecular pump 73, responsible for further reducing the air pressure in the system. The exhaust port of the turbomolecular pump 73 is also connected to the condensation recovery device through a pipeline to collect the exhaust gas after being processed by the molecular pump. These gases may contain steam components at a relatively high temperature, and the condensation recovery device captures and recovers these steams through its condensation function.

[0066] The secondary chamber 62 vacuum pump is a roots pump 72, whose main function is to assist the primary chamber 61 vacuum pump in accelerating the pressure reduction process and maintaining a stable pressure. Since the exhaust gas flow of the roots pump 72 is usually relatively stable and at a low temperature, it generally does not need to be directly connected to the condensation recovery device, so its exhaust is directly discharged into the environment or other systems.

[0067] The connection design of the condensation recovery device to the primary and tertiary vacuum pumps not only helps to recover useful substances, reduce environmental pollution, but also improves the stability and operating efficiency of the system, while enhancing the reliability and safety of the equipment.

[0068] In a possible implementation, the design of the pulsed negative pressure generator 631 includes a high-speed solenoid valve 631A and a buffer tank 631B, and the buffer tank 631B is connected to the high-speed solenoid valve 631A. The air extraction ports of the turbomolecular pump 73 are respectively connected to the three-stage cavity 63 cavity and the buffer tank 631B. A honeycomb deflector multi-layer staggered structure is also provided in the buffer tank 631B.

[0069] The high-speed solenoid valve 631A can quickly switch to generate a pulsed negative pressure signal. The high-speed solenoid valve 631A is connected to the buffer tank 631B through a pipeline. When the solenoid valve is working, it can regulate the inflow and outflow of air, thereby forming an instantaneous negative pressure pulse in the buffer tank 631B. This process can precisely control the pulse characteristics of the air flow to meet the requirements of bubble elimination during the lithium battery electrolyte injection process.

[0070] The air extraction ports of the turbomolecular pump 73 are respectively connected to the three-stage cavity 63 cavity and the buffer tank 631B through pipelines. The turbomolecular pump 73 is responsible for extracting gas from the system and reducing the pressure. Its exhaust channel is connected to the buffer tank 631B through a pipeline, so that the exhaust of the turbomolecular pump 73 can flow into the buffer tank 631B and maintain a low-pressure environment in the system. The buffer tank 631B, as an intermediary for gas circulation, can effectively balance the air flow fluctuations in the vacuum system.

[0071] A honeycomb deflector is provided inside the buffer tank 631B. This multi-layer staggered structure helps to optimize the gas flow path and reduce the impact and fluctuations of the air flow in the buffer tank 631B. The design of the honeycomb deflector effectively guides the air flow, avoids excessive turbulence and pressure fluctuations of the air flow, ensures that the gas can flow evenly and be discharged stably, thereby improving the pulsed negative pressure control accuracy of the system.

[0072] Through the combination of the high-speed solenoid valve 631A, the turbomolecular pump 73, the buffer tank 631B and the honeycomb deflector, the pulsed negative pressure is precisely controlled, the bubbles in the electrolyte are effectively removed, the stability and efficiency of the injection process are improved, the energy consumption is reduced, and the performance and service life of the lithium battery are enhanced.

[0073] In a possible implementation, the input of the decision-making layer comes from the electrolyte type and the target bubble residue rate, and this information is usually provided through sensors or manual settings. The electrolyte type directly affects the initial setting values such as the pressure gradient, ultrasonic frequency and pulse parameters required during the injection process. The decision-making layer presets the process parameters according to the input electrolyte type and target bubble residue rate, selects a suitable operation mode, and stores and analyzes relevant data. The output is the initial setting values, including the pressure gradient, ultrasonic frequency and pulse parameters, etc. These initial setting values will be used as the input of the coordination layer.

[0074] The input of the coordination layer comes from the real-time data provided by each sensor, including the pressure, temperature, liquid flow rate, ultrasonic working state, etc. of the vacuum system. The coordination layer is responsible for real-time optimization based on the sensor data and implementing exception handling. It adjusts the working state of the system according to the real-time data and outputs the rotation speed execution instructions of each vacuum pump in the vacuum pump group 7, the opening degree execution instructions of the valve 5, and the ultrasonic power execution instructions. These outputs will be used as the input of the execution layer to ensure the efficient operation of the equipment and timely adjustment in case of anomalies.

[0075] The execution layer receives the specific instructions from the coordination layer and drives the relevant components to operate. Specifically, the execution layer adjusts the rotation speed of the vacuum pump according to the instructions of the coordination layer, controls the driver of the piezoelectric ceramic array 621 to achieve ultrasonic vibration, and adjusts the opening and closing states of each valve 5 according to the valve 5 opening degree instruction. The goal of the execution layer is to convert the instructions of the coordination layer into specific mechanical actions to ensure that the system precisely and efficiently executes each operation.

[0076] Through the precise three-layer architecture (decision-making layer, coordination layer, and execution layer), this control system realizes the highly automated and intelligent control of the integrated device for vacuum injection and bubble elimination of lithium battery electrolyte. Through real-time data feedback and dynamic adjustment, it effectively improves the production efficiency, quality control accuracy, and system reliability, ensuring the high efficiency and stability of battery production.

[0077] The beneficial effects brought by the technical solution provided by the embodiments of the present invention at least include:

[0078] The present invention can effectively eliminate the bubbles in the battery electrolyte, avoiding the adverse effects of bubbles on the battery performance. The three-stage vacuum chamber 6 is used to reduce the vacuum degree in stages, combined with the precise control of ultrasonic crushing and pulse negative pressure, so that the bubbles can be efficiently removed at different stages. At the same time, the porous liquid injection plate 632 and the heating component are adopted to effectively avoid the generation of local turbulent bubbles and achieve uniform electrolyte injection. This device improves the efficiency and consistency of battery liquid injection, ensuring the long-term stability and high performance of the battery.

[0079] The present invention covers any substitutions, modifications, equivalent methods, and solutions made on the essence and scope of the present invention. For the public to have a thorough understanding of the present invention, specific details are described in detail in the preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without these details. In addition, well-known methods, processes, flows, components, and circuits are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0080] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An integrated device for vacuum injection and bubble elimination of lithium battery electrolyte, characterized in that, Including: A vacuum working chamber (1), a liquid injection device (2), a moving device (3), a battery fixing device (4), a liquid injection pump, a three-stage vacuum chamber (6) and a vacuum pump group (7). The liquid injection device (2), the moving device (3), the battery fixing device (4), the liquid injection pump, the three-stage vacuum chamber (6) and the vacuum pump group (7) are all installed and fixed in the vacuum working chamber (1). The liquid injection device (2) is installed and fixed on the moving device (3). The battery fixing device (4) is used to fix the battery. The moving device (3) controls the liquid injection device (2) to move to the corresponding position of the battery. The inlet of the liquid injection pump is connected to the electrolyte storage tank, the outlet of the liquid injection pump is connected to the inlet of the three-stage vacuum chamber (6), the outlet of the three-stage vacuum chamber (6) is connected to the inlet of the liquid injection device (2), and the vacuum pump group (7) provides a vacuum environment for the vacuum working chamber (1) and the three-stage vacuum chamber (6). All the connections are sealed connections; The three-stage vacuum chamber (6) includes a first-stage chamber (61), a second-stage chamber (62) and a third-stage chamber (63). The vacuum degree in the first-stage chamber (61) is 50 - 100 kPa, the vacuum degree in the second-stage chamber (62) is 10 - 50 kPa, and the vacuum degree in the third-stage chamber (63) is less than 5 kPa; A spiral flow channel (611), a porous degassing device (612) and a preheating device (613) are arranged in the first-stage chamber (61). A piezoelectric ceramic array (621) and a buffer layer (622) are arranged in the second-stage chamber (62). A pulse negative pressure generator (631) and a porous liquid injection plate (632) are arranged in the third-stage chamber (63); The first-stage chamber (61) is a horizontal cylindrical cavity. The first-stage chamber (61) is in an inclined state in the axial direction, so that the liquid storage part is lower than the spiral part. A valve (5) is installed and fixed at the outlet of the liquid storage part and is connected to the second-stage chamber (62). The spiral part is a double-headed spiral structure, and the cross-sectional shape of the flow channel is circular; In the second-stage chamber (62), the cavity of the second-stage chamber (62) is a vertical cylindrical cavity. The piezoelectric ceramic array (621) is installed and fixed on the inner side wall of the second-stage chamber (62). The buffer layer (622) is installed and fixed in the middle of the second-stage chamber (62), dividing the cavity into upper and lower regions. A valve (5) is arranged at the bottom outlet of the cavity of the second-stage chamber (62) and is connected to the third-stage chamber (63); A viscosity sensor and a sound pressure sensor are also installed and fixed on the side wall of the cavity of the second-stage chamber (62); The integrated device for vacuum injection and bubble elimination of lithium battery electrolyte also includes a control system, which includes a decision-making layer, a coordination layer, and an execution layer. The decision-making layer includes process parameter presetting, operation mode selection, and data storage and analysis. Its input is the electrolyte type and the target bubble residue rate, and its output is the initial setting values related to the pressure gradient, ultrasonic frequency, and pulse parameters issued. The coordination layer includes multi-chamber linkage logic, anomaly handling, and real-time optimization. Its input is the real-time data of each sensor, and its output is the rotation speed execution instructions of each vacuum pump in the vacuum pump group (7), the opening degree execution instructions of each valve (5), and the ultrasonic power execution instructions. The execution layer receives the instructions from the coordination layer and drives the vacuum pump, the driver of the piezoelectric ceramic array (621), and each valve (5).

2. The integrated device for vacuum injection and bubble elimination of lithium battery electrolyte according to claim 1, wherein In the first-stage chamber (61), the spiral flow channel (611) includes a liquid storage part and a spiral part. The electrolyte enters the liquid storage part through the spiral part. The porous degassing device (612) is fixedly installed on the top of the liquid storage part, and the preheating device (613) is fixedly installed in the liquid storage part and on the outer side of the spiral part. A waste recycling device is connected to the porous degassing device (612).

3. The integrated device for vacuum injection and bubble elimination of lithium battery electrolyte according to claim 2, characterized in that In the third-stage chamber (63), the shape of the chamber of the third-stage chamber (63) is a cuboid, and the inner wall of the chamber of the third-stage chamber (63) is coated with an anti-sticking coating. The pulse negative pressure generator (631) is fixedly installed in the chamber of the third-stage chamber (63) through a flexible connector, and the inlet of the pulse negative pressure generator (631) is fixedly connected to the inlet of the third-stage chamber (63).

4. The integrated device for vacuum injection and bubble elimination of lithium battery electrolyte according to claim 3, characterized in that The material of the porous liquid injection plate (632) is silicon carbide ceramic, and the pore size distribution is main pores: auxiliary pores = 7:

3. The aperture of the main pores is 50 - 200 nm, and the aperture of the auxiliary pores is 1 - 5 μm. A heating component is also provided in the porous liquid injection plate (632) to uniformly heat the porous liquid injection plate (632).

5. The integrated device for vacuum injection and bubble elimination of lithium battery electrolyte according to claim 4, characterized in that The vacuum pump group (7) includes a vacuum pump for the first-stage chamber (61), a vacuum pump for the second-stage chamber (62), and a vacuum pump for the third-stage chamber (63). The air extraction port of the vacuum pump for the first-stage chamber (61) is connected to the first-stage chamber (61). The air extraction port of the vacuum pump for the second-stage chamber (62) is connected to the second-stage chamber (62), and the exhaust port of the vacuum pump for the second-stage chamber (62) is connected to the first-stage chamber (61). The air extraction port of the vacuum pump for the third-stage chamber (63) is connected to both the third-stage chamber (63) and the vacuum operation chamber (1).

6. The integrated device for vacuum injection and bubble elimination of lithium battery electrolyte according to claim 5, characterized in that, It also includes a condensation recovery device. The exhaust ports of the vacuum pump for the first-stage chamber (61) and the vacuum pump for the third-stage chamber (63) are both connected to the condensation recovery device. The vacuum pump for the first-stage chamber (61) is a rotary vane vacuum pump (71), the vacuum pump for the second-stage chamber (62) is a roots pump (72), and the vacuum pump for the third-stage chamber (63) is a turbo molecular pump (73).

7. The integrated device for vacuum injection and bubble elimination of the lithium battery electrolyte according to claim 6, characterized in that The pulse negative pressure generator (631) includes a high-speed solenoid valve (631A) and a buffer tank (631B). The buffer tank (631B) is connected to the high-speed solenoid valve (631A). The air extraction ports of the turbo molecular pump (73) are respectively connected to the cavity of the three-stage cavity (63) and the buffer tank (631B). A honeycomb flow guide plate multi-layer staggered structure is arranged in the buffer tank (631B).

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