Reaction apparatus and method for lithium battery separator coating and plasma modification treatment

Abstract

The application discloses a kind of lithium battery separator coating and plasma modification processing reaction device and method, processing cavity and plasma generation cavity are connected in side by plasma delivery port, by turnover transmission wheel realizes the turnover of lithium battery separator to realize the double-sided coating of lithium battery separator, and be subjected to plasma processing on separator stacking platform.The application will be coated and plasma treatment process such as lithium battery separator by integrated continuous reaction device to realize one-step process, wherein multiple control devices can be adjusted as required according to lithium battery separator processing requirements, so that the coating speed and coating amount of lithium battery separator are accurately controlled, the instability in the modification process of lithium battery separator is reduced, each step in the whole process is organically combined, the modification efficiency of lithium battery separator is greatly improved, and automation of production is realized, and it can be applied to the battery lithium battery separator required for large-scale production of high-safety lithium battery.

Description

Technical Field

[0001] This invention belongs to the field of new energy technology and relates to a reaction apparatus and method for lithium battery separator coating and plasma modification treatment. Background Technology

[0002] Currently, replacing gasoline with electricity is a long-term trend in the automotive industry, and new energy vehicles have become the main trend in the future global automotive market. As a core component of new energy vehicles, lithium batteries will inevitably see rapid growth in market demand. This makes expanding the application of new energy sources of great significance.

[0003] Lithium-ion batteries are the "heart" of new energy electric vehicles, directly affecting their range and safety. The lithium-ion battery separator plays a crucial role in preventing short circuits between the positive and negative electrodes and provides a transport channel for lithium ions during charging and discharging, directly influencing the battery's capacity, cycle performance, and safety. A series of safety issues exist with lithium-ion battery separators, such as the growth of lithium dendrites caused by repeated charge-discharge cycles, which can puncture the separator and cause a short circuit between the positive and negative electrodes; and the shrinkage and ignition of the separator during thermal runaway, potentially leading to explosions and fires. Effective solutions are needed. "Wet coating" is a recognized industry trend for high-safety lithium-ion battery separators. Using different slurries, coating can improve the overall performance of lithium-ion battery separators, such as improving their thermal stability and mechanical strength, thereby ensuring safe battery use and extending cycle life. Therefore, researching the modification of lithium-ion battery separator coating slurries and developing novel lithium-ion battery separator coating devices is of great significance.

[0004] The lithium-ion battery separator used in conventional lithium-ion batteries is a commercially available PP lithium-ion battery separator. Its components, being non-polar molecules, have limited efficiency in ion passage during the positive and negative electrode reactions due to their generally poor wettability and compatibility with electrolyte solutions. This results in insufficient lithium-ion transfer rate and conductivity, causing the battery to perform below its normal operating efficiency under various conditions and experience capacity reduction after multiple charge-discharge cycles. To address this, a coating modification method can be used. A coating is applied to the surface of the lithium-ion battery separator. Because the modified layer contains a large number of polar functional groups, the modified lithium-ion battery separator exhibits better electrolyte wettability and compatibility than commercial PP films, significantly improving lithium-ion transfer rate and ionic conductivity. Furthermore, the modified lithium-ion battery separator has higher heat resistance, thus reducing thermal shrinkage caused by the thermal sealing of pores in the PP film and improving thermal stability.

[0005] Plasma, the fourth state of matter, is an electrically neutral conductive fluid. Plasma surface modification technology is a completely waterless gas-solid coherent processing method that can effectively alter the surface free energy and affinity of the modified material. It boasts advantages such as speed, environmental friendliness, high efficiency, simple operation, energy saving, and no change to the material's matrix properties. Plasma contains a large number of high-energy electrons and active particles, which can improve the surface charge properties of materials without altering their bulk properties. Fluorine (F) is the most electronegative element, capable of forming extremely strong covalent bonds with cations in battery reactions. A high proportion of fluorine can eliminate the delithiation effect, thus benefiting surface stability. The in-situ reaction of fluorine additives with the lithium anode can also form a lithium fluoride layer and promote lithium electrodeposition in the parallel direction rather than vertical growth. Based on the above analysis, fluorine modification optimization of lithium-ion battery separators is an effective means to achieve high safety and high performance. A fluorine-modified protective layer was prepared on the lithium-ion battery separator using a combination of fluorine plasma treatment. It can not only effectively address the thermal shrinkage effect and enhance physical strength, but also inhibit lithium dendrite growth that could puncture the lithium-ion battery separator. The current challenge lies in selecting an appropriate method to effectively achieve the fluorination process without altering the inherent function of the lithium-ion battery separator. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of difficulty in controlling the amount of raw materials coated, long process time, and low material utilization in traditional manual coating methods and drying followed by plasma treatment. This invention provides a reaction device and method for lithium battery separator coating and plasma modification treatment. The invention integrates the coating and plasma treatment processes of lithium battery separators into a single, continuous reaction device. Multiple control devices can be adjusted as needed according to the processing requirements of the lithium battery separator, allowing for precise control of the coating speed and amount, reducing instability in the lithium battery separator modification process. By organically combining the various steps in the entire process, the efficiency of lithium battery separator modification is significantly improved, and production is automated. This invention is suitable for large-scale production of lithium battery separators required for high-safety lithium batteries.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] In a first aspect, the present invention provides a reaction apparatus for lithium battery separator coating and plasma modification treatment, comprising:

[0009] The processing chamber is equipped with a conveying unit, a coating unit, and a separator stacking platform. The conveying unit is used to convey the lithium battery separator into the processing chamber, and the coating unit applies slurry to the front and back of the lithium battery separator. After the slurry is applied, the separator is conveyed to the separator stacking platform for unfolding.

[0010] The plasma generation chamber is equipped with a discharge device and a heating device. The discharge device is used to discharge and ionize the input raw material gas and inert gas to generate plasma. The heating device is used to heat the plasma. The plasma generation chamber is connected to the processing chamber and is used to transport the heated plasma to the processing chamber to interact with the lithium battery separator that is unfolded on the separator stacking platform.

[0011] Furthermore, the conveying unit of the present invention includes a rolling roller, a flipping transmission roller, and a transmission roller; the rolling roller is disposed at the diaphragm inlet of the processing chamber and is used to provide conveying power for the lithium battery diaphragm; the flipping transmission roller is used to flip the lithium battery diaphragm; the diaphragm inlet, the rolling roller, the flipping transmission roller, the transmission roller, and the diaphragm stacking platform are connected by a transmission belt, which is used to carry the lithium battery diaphragm; the coating unit is disposed above the transmission belt and is provided with two coating outlets facing the front and back of the lithium battery diaphragm respectively for coating; the coated lithium battery diaphragm is conveyed to the diaphragm stacking platform by the transmission roller and unfolded to interact with high-temperature plasma.

[0012] Furthermore, the present invention has a speed regulating device connected to the roller for adjusting the conveying speed of the lithium battery separator.

[0013] Furthermore, the coating unit of the present invention includes a coating material tank disposed in the processing chamber, and a liquid pressure control device is connected to the coating material tank for adjusting the coating flow rate of the slurry.

[0014] Furthermore, the discharge device of the present invention includes a discharge positive electrode and a discharge negative electrode disposed in the plasma generation cavity, wherein the discharge positive electrode and the discharge negative electrode are respectively connected to the positive and negative terminals of a high-voltage power supply, and the high-voltage power supply is grounded through a grounding wire.

[0015] Furthermore, the plasma generation chamber of the present invention is provided with a gas reaction chamber inlet, which is connected to the raw material gas inlet and the inert gas inlet through an inlet regulating valve; a gas flow meter is provided in the gas path between the inlet regulating valve and the gas reaction chamber inlet.

[0016] Furthermore, the processing cavity of the present invention is provided with an air outlet and a plasma delivery port for connecting to the plasma generation cavity.

[0017] Secondly, the present invention provides a reaction method for coating and plasma modification of a lithium battery separator, comprising the following steps:

[0018] The lithium battery separator to be modified is placed into the separator inlet and comes into contact with the roller. The prepared coating slurry is added to the coating material tank. The liquid pressure control device is adjusted to ensure that the slurry can be coated at a stable flow rate. The speed control device connected to the roller is adjusted to make the lithium battery separator move at a constant speed along the transmission belt. The lithium battery separator is flipped at the flipping transmission wheel to achieve double coating of the lithium battery separator.

[0019] Adjust the intake regulating valve to adjust the ratio and flow rate of the inert gas and raw material gas entering the plasma generation chamber, and monitor the gas composition entering the plasma generation chamber through a gas flow meter;

[0020] The high-voltage power supply is turned on to generate a discharge area in the plasma generation chamber, which discharges the mixture of raw material gas and inert gas to generate plasma. The prepared plasma is heated by a heating device and then enters the processing chamber to act on the coated lithium battery separator.

[0021] The reacted plasma and excess waste gas are discharged through the outlet of the treatment chamber.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention's liquid pressure control device and coating material tank can adjust the liquid pressure to control the appropriate flow rate at the coating outlet based on different raw material ratios and viscosities of the slurry used. The rollers and speed control device can adjust the speed to meet the coating requirements of lithium battery separators at different speeds. The flipping drive wheel and the drive wheel's flipping process for the lithium battery separator enable double-sided coating modification treatment, resulting in superior electrochemical performance compared to single-sided coating. The separator stacking platform can place lithium battery separators of considerable length into the processing chamber at once and lay them evenly for better plasma modification treatment. The regulating valves and gas flow meters for the raw material gas inlet and inert gas inlet allow for flexible adjustment of gas ratios and flow rates. Furthermore, various raw material gases can be selected for plasma modification treatment according to different requirements of lithium battery separator modification, making the device highly versatile in plasma processing. The heating device simultaneously heats the plasma and performs high-temperature drying on the coated lithium-ion battery separator within the plasma atmosphere. The mechanical properties of the separator are improved through compaction by multiple drive rollers. Therefore, this device enhances the electrochemical performance of the lithium-ion battery separator through slurry coating and plasma treatment. The high-temperature plasma atmosphere ensures efficient processing of the coating slurry, and the action of the rollers and drive rollers flattens the separator, removes wrinkles, and improves its mechanical properties.

[0024] This invention realizes plasma modification of high-safety lithium battery separators, achieving a one-step organic combination of lithium battery separators, coating slurry, and plasma treatment. This eliminates the reliance on unstable manual operation and cumbersome processing for lithium battery separator manufacturing, achieving a highly efficient, rapid, stable, and automated process for lithium battery separator modification. It is highly feasible for mass production and can be put into large-scale production. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a continuous reaction apparatus for plasma modification treatment of the high-safety lithium battery separator of the present invention.

[0027] Wherein: 1-Diaphragm inlet, 2-Rolling roller, 3-Speed ​​control device, 4-Liquid pressure control device, 5-Coating raw material tank, 6-Tilting drive wheel, 7-Coating outlet, 8-Drive wheel, 9-Diaphragm stacking platform, 10-Gas outlet, 11-Plasma delivery port, 12-Raw material gas inlet, 13-Inert gas inlet, 14-Inlet regulating valve, 15-Gas flow meter, 16-Gas reaction chamber inlet, 17-Plasma generation chamber, 18-High voltage power supply, 19-Discharge positive electrode, 20-Grounding wire, 21-Heating device, 22-Discharge negative electrode. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] See Figure 1 This invention discloses a reaction apparatus for coating and plasma modification of lithium battery separators, including a processing chamber and a plasma generation chamber 17.

[0036] The processing chamber is equipped with a conveying unit, a coating unit, and a separator stacking platform 9. The conveying unit transports the lithium battery separator into the processing chamber, where the coating unit applies a slurry to the front and back sides of the separator. After coating, the separator is conveyed to the separator stacking platform 9 for unfolding. The conveying unit includes a roller 2, a turning drive roller 6, and a drive roller 8. The roller 2 is located at the separator inlet 1 of the processing chamber and provides conveying power to the lithium battery separator. The turning drive roller 6 flips the lithium battery separator. A drive belt is provided on the roller 2 and the turning drive roller 6 to carry the lithium battery separator. The coating unit is located above the drive belt and has two coating outlets 7 facing the front and back sides of the lithium battery separator respectively for coating. The coated lithium battery separator is conveyed to the separator stacking platform 9 via the drive roller 8 for unfolding and interaction with high-temperature plasma. A speed regulating device 3 is connected to the roller 2 to adjust the conveying speed of the lithium battery separator. The coating unit includes a coating material tank 5 disposed within the processing chamber. A liquid pressure control device 4 is connected to the coating material tank 5 for adjusting the coating flow rate of the slurry. The processing chamber is provided with an air outlet 10 and a plasma delivery port 11 for connecting to the plasma generation chamber 17.

[0037] The plasma generation chamber 17 is equipped with a discharge device and a heating device 21. The discharge device is used to ionize the input raw material gas and inert gas to generate plasma. The heating device 21 is used to heat the plasma. The plasma generation chamber 17 is connected to the processing chamber and is used to transport the heated plasma to the processing chamber to interact with the lithium battery separator deployed on the separator stacking platform 9. The discharge device includes a discharge positive electrode 19 and a discharge negative electrode 22 disposed in the plasma generation chamber 17. The discharge positive electrode 19 and the discharge negative electrode 22 are respectively connected to the positive and negative terminals of the high-voltage power supply 18, which is grounded through a grounding wire 20. The plasma generation chamber 17 is equipped with a gas reaction chamber inlet 16, which is connected to the raw material gas inlet 12 and the inert gas inlet 13 through an inlet regulating valve 14. A gas flow meter 15 is installed in the gas path between the inlet regulating valve 14 and the gas reaction chamber inlet 16.

[0038] The structural principle of this invention:

[0039] Above the processing chamber is a roller 2 controlled by a speed regulating device 3, used to control the compaction and uniform speed transmission of the lithium battery separator to facilitate coating. The coating device includes a liquid pressure control device 4, a coating material tank 5, and a coating outlet 7. The coating device acts on both sides of the lithium battery separator on the transmission belt to achieve double-sided coating. The coating material is a solid-liquid mixture slurry. Inside the processing chamber are rollers 2 and transmission wheels 8, which provide the coating surface for the lithium battery separator and can complete the flipping process of the lithium battery separator. The separator stacking platform 9 can store the coated lithium battery separator and perform the next plasma treatment here. The processing chamber has an outlet 10 at the bottom for discharging the plasma and excess waste gas after the reaction. The plasma delivery port 11 on the right side of the processing chamber connects to the plasma generation chamber 17. The plasma generation chamber 17 has a raw material gas inlet 12 and an inert gas inlet 13 at the top, both controlled by an inlet regulating valve 14 and monitored by a gas flow meter 15, which can control the flow rate and ratio of the gas entering the plasma generation chamber 17. Inside the plasma generation chamber 17, a positive and negative high-voltage power supply 18 discharges to discharge the mixed gas entering the chamber to generate plasma. The internal heating device 21 raises the temperature of the prepared plasma, which can effectively improve the efficiency of the plasma acting on the lithium battery separator in the processing chamber and the effect of lithium battery separator modification.

[0040] There is an appropriate distance between the roller 2 and the transmission belt to allow the lithium battery separator to be laid flat. At the same time, it is compacted by each roller 2 and the transmission wheel. It can be flipped over and coated simultaneously through the coating outlet 7 to achieve a double-layer coating process. It is then spread out on the separator stacking platform 9 and fully interacts with the high-temperature plasma to quickly heat-dry the freshly coated but not dried lithium battery separator at high temperature, which is also more conducive to plasma treatment.

[0041] The rolling mill 2 is controlled by the speed regulating device 3 to compact the lithium battery separator at a certain speed and pressure. The flipping transmission wheel 6 and transmission wheel 8 are connected to the separator stacking platform 9 through the transmission belt to control the transmission speed and processing efficiency of the lithium battery separator. The liquid pressure control device 4 and the coating raw material tank 5 are directly connected to each other to control the output flow of the liquid and directly coat the lithium battery separator on the transmission belt through the coating outlet 7 below. The plasma generation chamber 17 has a raw material inlet 12 and an inert gas inlet 13 controlled by the inlet regulating valve 14 and monitored by the gas flow meter 15. It contains a discharge positive electrode 19, a discharge negative electrode 22 and a heating device 21, and is connected to the processing chamber by the plasma delivery port 11. The generated plasma and waste gas are finally output from the outlet 13. The device is externally connected to a high-voltage power supply 18 and an external grounding wire 20.

[0042] The separator inlet 1, roller 2, flipping drive roller 6, drive roller 8, and separator stacking platform 9 are connected by a drive belt to control the transmission direction and stacking method of the lithium battery separator. The lithium battery separator compacted by the roller 2 can be conveyed more closely to the drive belt. Under the guidance of the flipping drive roller 6, the lithium battery separator is flipped over, which can be used for double-sided coating. Finally, it is transferred to the separator stacking platform 9 by the drive roller 8 for subsequent processing.

[0043] The plasma generation chamber 17 receives raw material gas through the raw gas inlet 12 and inert gas inlet 13. Under the regulation of the gas inlet regulating valve 14 and the gas flow meter 15, the gas is input as required. Under the discharge ionization effect of the discharge positive electrode 19 and discharge negative electrode 22 connected to the upper and lower ends of the plasma reaction chamber by the high voltage power supply 18, plasma is generated. The high temperature plasma is heated by the heating device 21 and input into the processing chamber through the plasma delivery port 11. The plasma generation device and the coating device are combined to achieve one-step modification of lithium battery separator.

[0044] The raw material gas inlet 12 and the inert gas inlet 13 are controlled by the inlet regulating valve 14 and monitored by the gas flow meter 15, and are transported to the plasma generation chamber 17 through the gas reaction chamber inlet 16. At the same time, plasma is generated by the discharge action of the discharge positive electrode 19 and the discharge negative electrode 22.

[0045] This invention also discloses a reaction method for coating and plasma modification of a lithium battery separator, comprising the following steps:

[0046] The lithium battery separator to be modified is placed into the separator inlet 1 and comes into contact with the roller 2. The prepared coating slurry is added into the coating material tank 5. The liquid pressure control device 4 is adjusted to ensure that the slurry can be coated at a stable flow rate. The speed control device 3 connected to the roller 2 is adjusted to make the lithium battery separator move at a constant speed along the transmission belt. The lithium battery separator is flipped at the flipping transmission wheel 6 to achieve double coating of the lithium battery separator.

[0047] Adjust the inlet regulating valve 14 to regulate the ratio and flow rate of the incoming inert gas and raw material gas, and monitor the gas composition entering the plasma generation chamber 17 through the gas flow meter 15. Taking fluorine plasma as an example, the raw material gas for preparing this type of plasma is a gas containing fluorine, such as carbon tetrafluoride, Freon, etc.

[0048] The high-voltage power supply 18 is turned on to generate a discharge region in the plasma generation chamber 17. The mixture of raw material gas and inert gas is discharged to generate plasma. The parameters of the high-voltage power supply 18 are adjusted to obtain better plasma preparation conditions. The prepared plasma is heated by the heating device 21 and then enters the processing chamber to act on the coated lithium battery separator.

[0049] The reacted plasma and excess waste gas are discharged through the outlet 10 of the treatment chamber.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A reaction method for coating and plasma modification of a lithium battery separator, the reaction method being based on a reaction apparatus for coating and plasma modification of a lithium battery separator, the reaction apparatus comprising a processing chamber and a plasma generation chamber (17); the processing chamber being provided with a conveying unit, a coating unit and a separator stacking platform (9); the conveying unit being used to convey the lithium battery separator into the processing chamber, and the coating unit applying a slurry to the front and back sides of the lithium battery separator, and after the slurry is applied, conveying it to the separator stacking platform (9) for unfolding; the conveying unit comprising a rolling roller (2), a flipping transmission roller (6) and a transmission roller (8); the rolling roller (2) being disposed at the separator inlet (1) of the processing chamber, being used to provide conveying power for the lithium battery separator; the flipping transmission roller (6) being used to flip the lithium battery separator; the separator inlet (1), the rolling roller (2), the flipping transmission roller (8) being disposed at the separator inlet (1) of the processing chamber, being used to provide conveying power for the lithium battery separator; the flipping transmission roller (6) being used to flip the lithium battery separator; the separator inlet (1), the rolling roller (2), the flipping transmission roller (8) being disposed at the separator inlet (1) of the processing chamber, and the transmission roller (8) being used to flip the lithium battery separator; the transmission roller (6) being used to flip the lithium battery separator; the transmission roller (8 ... The driving wheel (6), the transmission wheel (8), and the separator stacking platform (9) are connected by a transmission belt, which is used to carry the lithium battery separator; the coating unit is located above the transmission belt and has two coating outlets (7) facing the front and back of the lithium battery separator respectively for coating; the coated lithium battery separator is transported to the separator stacking platform (9) by the transmission wheel (8) and unfolded to interact with high-temperature plasma; the plasma generation chamber (17) is equipped with a discharge device and a heating device (21); the discharge device is used to discharge and ionize the input raw material gas and inert gas to generate plasma; the heating device (21) is used to heat the plasma; the plasma generation chamber (17) is connected to the processing chamber and is used to transport the heated plasma to the processing chamber to interact with the lithium battery separator unfolded on the separator stacking platform (9); characterized in that, The reaction method includes the following steps: The lithium battery separator to be modified is placed into the separator inlet (1) and comes into contact with the roller (2). The prepared coating slurry is added to the coating material tank (5). The liquid pressure control device (4) is adjusted so that the slurry can be coated at a stable flow rate. The speed control device (3) connected to the roller (2) is adjusted so that the lithium battery separator moves at a constant speed along the transmission belt. The lithium battery separator is flipped at the flipping transmission wheel (6) to achieve double coating of the lithium battery separator. Adjust the intake regulating valve (14) to adjust the ratio and flow rate of the inert gas and raw material gas entering, and monitor the gas composition of the input plasma generation chamber (17) through the gas flow meter (15); Start the high voltage power supply (18) to generate a discharge area in the plasma generation chamber (17), discharge the mixture of raw material gas and inert gas to generate plasma, and heat the prepared plasma through the heating device (21) and let it enter the processing chamber to act on the coated lithium battery separator. The reacted plasma and excess waste gas are discharged through the outlet (10) of the treatment chamber; The plasma generation chamber (17) receives gas as required through the raw material gas inlet (12) and the inert gas inlet (13), and the gas is regulated by the gas inlet regulating valve (14) and the gas flow meter (15). Under the discharge ionization effect of the high voltage power supply (18) connected to the upper and lower ends of the plasma reaction chamber, plasma is generated. The high temperature plasma is generated by heating through the heating device (21). The plasma in the processing chamber is input through the plasma delivery port (11). The plasma generation device and the coating device are combined to achieve the one-step modification of the lithium battery separator.

2. The reaction method for lithium battery separator coating and plasma modification treatment according to claim 1, characterized in that, The roller (2) is connected to a speed regulating device (3) for adjusting the conveying speed of the lithium battery separator.

3. The reaction method for lithium battery separator coating and plasma modification treatment according to any one of claims 1 or 2, characterized in that, The coating unit includes a coating material tank (5) disposed in the processing chamber, and a liquid pressure control device (4) is connected to the coating material tank (5) for adjusting the coating flow rate of the slurry.

4. The reaction method for lithium battery separator coating and plasma modification treatment according to claim 1, characterized in that, The discharge device includes a discharge positive electrode (19) and a discharge negative electrode (22) disposed in the plasma generation chamber (17). The discharge positive electrode (19) and the discharge negative electrode (22) are respectively connected to the positive and negative terminals of the high voltage power supply (18), and the high voltage power supply (18) is grounded through the grounding wire (20).

5. The reaction method for lithium battery separator coating and plasma modification treatment according to claim 1, characterized in that, The plasma generation chamber (17) is provided with a gas reaction chamber inlet (16), which is connected to the raw material gas inlet (12) and the inert gas inlet (13) through an air intake regulating valve (14); a gas flow meter (15) is provided in the gas path between the air intake regulating valve (14) and the gas reaction chamber inlet (16).

6. The reaction method for lithium battery separator coating and plasma modification treatment according to claim 1, characterized in that, The processing chamber is provided with an air outlet (10) and a plasma delivery port (11) for connecting to the plasma generation chamber (17).

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