Lithium battery vacuum baking device and method

Abstract

The invention discloses a lithium battery vacuum baking device and method and relates to the technical field of batteries. The lithium battery vacuum baking method comprises the steps that a baking pressure function based on time of a lithium battery is obtained, the highest working step pressure of each working step is determined according to the baking pressure function, the highest working step pressure of the current working step is larger than the highest working step pressure of the next working step, and the highest working step pressure of the current working step is larger than the highest working step pressure of the next working step. The lowest working step pressure intensity of the current working step is equal to the lowest working step pressure intensity of the next working step; entering a first working step to bake the lithium battery; and judging whether a working step baking stop condition is met or not according to whether the baking time required for increasing the pressure to the highest working step pressure of the current working step is greater than the preset time or not, and if the baking time is greater than the preset time, ending the baking of the current working step, and entering the next working step until all the preset working steps are executed. According to the lithium battery vacuum baking method, the baking consistency, the baking efficiency and the service life of the vacuum pump can be improved, and the production energy consumption is reduced.

Description

[0001] Related Application

[0002] This application is a divisional application of the Chinese patent application with the application number 202211459091.6 and the title "A Lithium Battery Vacuum Baking Device and Method", which was filed with the Chinese Patent Office on November 17, 2022. The entire content is incorporated herein by reference. Technical Field

[0003] This application relates to the technical field of batteries, and more particularly, to a lithium battery vacuum baking device and method. Background Art

[0004] In the production process of lithium batteries, there are many factors that affect the performance of lithium batteries, such as material types, positive and negative electrode compaction densities, moisture, coating surface density, and electrolyte dosage. Among them, moisture has a very great impact on the performance of lithium batteries and is a factor that must be strictly controlled. When the moisture is excessive, it can not only cause the decomposition of lithium salts in the electrolyte and have a certain corrosive effect on the positive and negative electrode materials and the electrode sheets, but also easily lead to a decrease in the cycle performance and safety performance of lithium batteries.

[0005] The existing lithium battery baking processes are mainly two types. One is a baking process that maintains a continuous high-vacuum state, and the other is to insert a short period of drying gas for replacement in a continuous high-vacuum state. The latter has a certain efficiency improvement compared to the former, but it does not match the battery baking characteristics, and the baking efficiency is not particularly ideal. It is mainly manifested that when the water content of the battery is relatively high in the early stage, the pressure rise rate in the baking chamber is relatively high, while the vacuum pressure range is relatively small, and the vacuum pump needs to be frequently started for vacuum extraction. In the later stage of baking, when the water content of the battery is relatively low, the time required to reach the highest vacuum pressure is relatively long, resulting in inefficient baking. Summary of the Invention

[0006] The purpose of this application is to provide a lithium battery vacuum baking device and method, which can improve the baking consistency, baking efficiency, and the service life of the vacuum pump, and reduce the production energy consumption.

[0007] The embodiments of this application are implemented as follows:

[0008] An embodiment of the present application provides a method for vacuum baking a lithium battery, including: obtaining a baking pressure function based on time of the lithium battery, and determining the maximum step pressure of each step according to the baking pressure function, where the maximum step pressure of the current step is greater than the maximum step pressure of the next step, and the minimum step pressure of the current step is equal to the minimum step pressure of the next step; entering the first step to bake the lithium battery; judging whether the step baking stop condition is reached according to whether the baking time required for the pressure to rise to the maximum step pressure of the current step is greater than a preset time. If the baking time is greater than the preset time, the baking of the current step ends, and the next step is entered until all the preset steps are executed.

[0009] Optionally, entering the first step to bake the lithium battery includes: entering the first step, placing the lithium battery in the cavity of the baking device for baking; judging whether the step baking stop condition is reached according to whether the baking time required for the pressure to rise to the maximum step pressure of the current step is greater than a preset time. If the baking time is greater than the preset time, the end of the baking of the current step includes: obtaining the baking time required for the pressure in the cavity to rise to the maximum step pressure of the current step; if the baking time is less than or equal to the preset time, reducing the pressure in the cavity to the minimum step pressure of the current step, and baking the lithium battery again; if the baking time is greater than the preset time, the baking of the current step ends, and the next step is entered or the baking ends.

[0010] Optionally, reducing the pressure in the cavity to the minimum step pressure of the current step and baking the lithium battery again includes: introducing a dry gas into the cavity until the pressure in the cavity reaches the preset drying pressure of the current step; after a preset time, extracting the mixed gas until the pressure in the cavity drops to the minimum step pressure of the current step; baking the lithium battery again at the current step.

[0011] Optionally, when the baking of the current step ends and the next step is entered, it includes: introducing a dry gas into the cavity until the pressure in the cavity reaches the preset drying pressure of the next step; after a preset time, extracting the mixed gas until the pressure in the cavity drops to the minimum step pressure of the next step; baking the lithium battery at the next step.

[0012] Optionally, after the baking of the current step ends and the baking ends, the method further includes: extracting the mixed gas in the cavity until the pressure in the cavity drops to the minimum step pressure of the current step; taking out the baked lithium battery.

[0013] Optionally, obtain the baking pressure function of the lithium battery, and determine the maximum process pressure of each process step according to the baking pressure function, where the maximum process pressure of the current process step is greater than the maximum process pressure of the next process step, and the minimum process pressure of the current process step is equal to the minimum process pressure of the next process step, including: collecting the pressure data at each baking moment from the minimum process pressure to the maximum process pressure during the baking process of the lithium battery; using a computer to obtain the baking pressure function according to the corresponding relationship between the pressure data and the baking moment; determining the maximum process pressure of each process step according to the baking pressure function, where the maximum process pressure of the current process step is greater than the maximum process pressure of the next process step, and the minimum process pressure of the current process step is equal to the minimum process pressure of the next process step.

[0014] Optionally, the execution times of the current process step and the next process step are both within a preset range.

[0015] The embodiment of the present application further provides a lithium battery vacuum baking device, including a cavity, a control component, and a baking component electrically connected to the control component. The cavity is used to accommodate the lithium battery, and the control component can control the baking component to bake the lithium battery in multiple process steps, where the maximum process pressure of the current process step is greater than the maximum process pressure of the next process step, and the minimum process pressure of the current process step is equal to the minimum process pressure of the next process step.

[0016] Optionally, it further includes a vacuum component electrically connected to the control component. The vacuum component is used to extract the mixed gas in the cavity to reduce the pressure in the cavity to the minimum process pressure.

[0017] Optionally, it further includes an inflation component electrically connected to the control component. The inflation component is used to add dry gas into the cavity to make the pressure in the cavity reach the preset dry pressure.

[0018] The beneficial effects of the embodiment of the present application include:

[0019] An embodiment of the present application provides a method for vacuum baking a lithium battery, including: obtaining a baking pressure function based on time of the lithium battery, and determining the highest step pressure of each process step according to the baking pressure function, wherein the highest step pressure of the current process step is greater than the highest step pressure of the next process step, and the lowest step pressure of the current process step is equal to the lowest step pressure of the next process step; entering the first process step to bake the lithium battery; judging whether the process step baking stop condition is reached according to whether the baking time required for the pressure to rise to the highest step pressure of the current process step is greater than a preset time. If the baking time is greater than the preset time, the baking of the current process step ends, and the next process step is entered until all the preset process steps are executed. The above method for vacuum baking a lithium battery controls the baking process of the lithium battery from the aspect of the pressure rising rate, and takes the baking time required for the pressure to rise to the highest step pressure of the current process step being greater than the preset time as the process step baking cut-off signal, which can improve the baking consistency, baking efficiency and the service life of the vacuum pump, and reduce the production energy consumption. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 One of the flowcharts of the method for vacuum baking a lithium battery provided by an embodiment of the present application;

[0022] Figure 2 The baking pressure curve in the prior art;

[0023] Figure 3 The pressure tracking curve provided by an embodiment of the present application;

[0024] Figure 4 One of the flowcharts of the method for vacuum baking a lithium battery provided by an embodiment of the present application;

[0025] Figure 5 One of the flowcharts of the method for vacuum baking a lithium battery provided by an embodiment of the present application;

[0026] Figure 6 One of the flowcharts of the method for vacuum baking a lithium battery provided by an embodiment of the present application;

[0027] Figure 7 One of the flowcharts of the method for vacuum baking a lithium battery provided by an embodiment of the present application;

[0028] Figure 8 One of the flowcharts of the method for vacuum baking a lithium battery provided by an embodiment of the present application;

[0029] Figure 9 This is a schematic structural diagram of the lithium battery vacuum baking device provided by the embodiment of the present application.

[0030] Icon: 100 - Lithium battery vacuum baking device; 110 - Cavity; 120 - Control component; 130 - Baking component; 140 - Vacuum component; 150 - Inflation component. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0033] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0036] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the connection inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0037] Please refer to Figure 1 , the embodiment of the present application provides a method for vacuum baking a lithium battery, including:

[0038] S100: Obtain the baking pressure function based on time of the lithium battery, and determine the maximum step pressure of each step according to the baking pressure function, where the maximum step pressure of the current step is greater than the maximum step pressure of the next step, and the minimum step pressure of the current step is equal to the minimum step pressure of the next step.

[0039] The baking pressure function can be an existing function or a function obtained based on previous lithium battery baking data; the baking pressure function is a function based on time, and the pressure changes over time. Please refer to Figure 2 , Figure 2 is the baking pressure curve in the prior art, with the abscissa being time in seconds and the ordinate being pressure in Pa. Through this curve, the baking pressure function of the lithium battery can be obtained.

[0040] The baking process of the lithium battery is divided into multiple steps, and each step is executed sequentially in order. It can be understood that as each step is executed in sequence, the water content in the lithium battery gradually decreases, and the pressure rising rate during the baking process will also gradually slow down. The pressure rising rate during the lithium battery baking process can be obtained through the baking pressure function, and based on the pressure rising rate, with the principle that the total execution time of each step is within a preset range, the maximum step pressure of each step is determined. Given that the minimum step pressures of each step are the same, the maximum working pressure of each step determines the pressure rising range of this step, and this range is related to time and the pressure rising rate. Therefore, the baking process of the lithium battery is controlled from the aspect of the pressure rising rate to achieve a faster baking efficiency.

[0041] S200: Enter the first step and bake the lithium battery.

[0042] After determining the maximum step pressure of each step, the first step can be entered to bake the lithium battery. Please refer to Figure 3 , Figure 3The pressure tracking curve provided by the embodiment of the present application. It can be understood that during the execution of the first working step, the water content of the battery is the highest, and the pressure rising rate during baking is the fastest. Therefore, setting the highest working step pressure in the first working step to the maximum value can extend the baking time of this working step, thereby achieving the purpose of reducing the start-stop times of the vacuum pump and improving the use efficiency of the vacuum pump.

[0043] After the execution of the first working step, the water content of the lithium battery decreases. If the pressure control range set in the first working step is still used, the drying time of the subsequent working steps will be extended and the efficiency will be reduced. Therefore, the highest working step pressure of the subsequent working steps decreases in sequence to achieve a faster baking efficiency.

[0044] S300: Determine whether the working step baking stop condition is reached according to whether the baking time required for the pressure to rise to the highest working step pressure of the current working step is greater than the preset time. If the baking time is greater than the preset time, the baking of the current working step ends and enters the next working step until all the preset working steps are executed.

[0045] To ensure the consistency of battery baking, each working step no longer uses a fixed time as the cut-off signal, but determines whether the current working step needs to stop based on whether the baking time required for the pressure to rise from the lowest working step pressure to the highest working step pressure of the current working step is greater than the preset time. Define the process of the pressure rising from the lowest working step pressure to the highest working step pressure during baking as a cycle. After one cycle, it is necessary to determine whether the current working step needs to stop. If the baking time of this cycle is greater than the preset time, it means that it is difficult to bake the lithium battery efficiently within the current pressure range, and the current working step needs to end and enter the next working step; if the baking time of this cycle is less than or equal to the preset time, it means that the lithium battery can still be baked efficiently within the current pressure range, and it is necessary to stay in the current working step for the next cycle of baking. Repeat the above process until all the working steps are executed, and then the baking of the lithium battery can be ended.

[0046] It should be noted that in practical applications, the number of preset working steps can be set according to requirements. For example, Figure 3 As shown, the baking process of the lithium battery is divided into five preset working steps, namely the first working step, the second working step, the third working step, the fourth working step and the ending working step. The highest working step pressures of each working step are 145Pa, 120Pa, 100Pa, 80Pa and 60Pa in sequence, and the lowest working step pressure is 30Pa for all.

[0047] In summary, the above lithium battery vacuum baking method controls the baking process of the lithium battery from the aspect of the pressure rising rate, and uses the baking time required for the pressure to rise to the highest working step pressure of the current working step being greater than the preset time as the cut-off signal for working step baking, which can improve the baking consistency, baking efficiency and the life of the vacuum pump, and reduce the production energy consumption.

[0048] Please refer to Figure 4 , optionally, in an implementable manner of the embodiments of the present application, obtaining the baking pressure function of the lithium battery includes:

[0049] S110: Collect the pressure data at each baking moment from the lowest process pressure to the highest process pressure during the baking process of the lithium battery.

[0050] S120: Use a computer to obtain the baking pressure function according to the corresponding relationship between the pressure data and the baking moment.

[0051] S130: Determine the highest process pressure of each process according to the baking pressure function, where the highest process pressure of the current process is greater than the highest process pressure of the next process, and the lowest process pressure of the current process is equal to the lowest process pressure of the next process.

[0052] During the experiment or production process, collect the time-pressure data of the lithium battery baking, and use a computer to analyze the data, then the baking pressure function of the lithium battery based on time can be obtained. The operation is simple, the obtained baking pressure function has a high degree of coincidence with the actual baking process of the lithium battery, and the highest process pressure of each process determined by using this function is more in line with the actual baking situation of the lithium battery, which can further improve the baking efficiency and baking consistency of the lithium battery.

[0053] Please refer to Figure 5 , optionally, in an implementable manner of the embodiments of the present application, entering the first process and baking the lithium battery includes:

[0054] S210: Enter the first process and place the lithium battery in the cavity of the baking device for baking.

[0055] Judge whether the process baking stop condition is reached according to whether the baking time required for the pressure to rise to the highest process pressure of the current process is greater than the preset time. If the baking time is greater than the preset time, the current process baking ends, including:

[0056] S310: Obtain the baking time required for the pressure in the cavity to rise to the highest process pressure of the current process.

[0057] S320: If the baking time is less than or equal to the preset time, then reduce the pressure in the cavity to the lowest process pressure of the current process and bake the lithium battery again; if the baking time is greater than the preset time, the current process baking ends, enter the next process or end the baking.

[0058] The lithium battery is placed in the cavity of the baking device for baking. The cavity has strong sealing performance and better baking effect. At the same time, it is easier to implement by controlling the pressure rising rate in the cavity to control the baking process of the lithium battery.

[0059] After comparing the baking time with the preset time, there are three possible subsequent operations according to the comparison result, namely, one of continuing the current step, entering the next step and ending the baking.

[0060] Please refer to Figure 6 If the current process step is to be continued, optionally, in one achievable manner of the embodiment of the present application, the pressure in the cavity is reduced to the minimum process step pressure of the current process step, and the lithium battery is baked again, including:

[0061] S321: Drying gas is introduced into the cavity until the pressure in the cavity reaches the preset drying pressure of the current step.

[0062] S322: After a preset time, the mixed gas is extracted until the pressure in the cavity drops to the minimum step pressure of the current step.

[0063] S323: Bake the lithium battery again in the current process step.

[0064] Each process step has a corresponding preset drying pressure. After a cycle, dry gas is introduced into the cavity until the preset drying pressure of the current process step is reached. After the dry gas is mixed with water vapor in the cavity for a certain period of time, the mixed gas in the cavity is extracted to reduce the pressure in the cavity to the minimum process step pressure of the current process step, and the next cycle of lithium battery baking is carried out under the current process step. By introducing dry gas between two cycles to take out the water vapor in the cavity, the baking efficiency and baking effect can be further improved.

[0065] Please refer to Figure 7 If the process is to proceed to the next step, optionally, in one achievable manner of the embodiment of the present application, the current step of baking is completed, and the process of proceeding to the next step includes:

[0066] S324: Drying gas is introduced into the cavity until the pressure in the cavity reaches a preset drying pressure for the next step.

[0067] S325: After a preset time, the mixed gas is extracted until the pressure in the cavity drops to the minimum step pressure of the next step.

[0068] S326: In the next step, the lithium battery is baked.

[0069] After one process step is executed, dry gas is introduced into the cavity until the preset drying pressure of the next process step is reached. After the dry gas is mixed with water vapor in the cavity for a certain period of time, the mixed gas in the cavity is extracted to reduce the pressure in the cavity to the minimum process step pressure of the next process step, and the lithium battery is baked in the next process step. By introducing dry gas between two process steps to remove water vapor in the cavity, the baking efficiency and baking effect can be further improved.

[0070] Please refer to Figure 8 For ending the baking, optionally, in an implementable manner of the embodiments of the present application, when the baking of the current process step ends, after ending the baking, the method further includes:

[0071] S327: Extract the mixed gas in the cavity until the pressure in the cavity drops to the lowest process step pressure of the current process step.

[0072] S328: Take out the baked lithium battery.

[0073] Optionally, in an implementable manner of the embodiments of the present application, the execution times of the current process step and the next process step are both within a preset range to improve the baking efficiency and consistency.

[0074] It should be noted that the preset range is a time period, and the execution time of each process step is within this time period.

[0075] Please refer to Figure 9 , this embodiment further provides a lithium battery vacuum baking device 100, including a cavity 110, a control component 120, and a baking component 130 electrically connected to the control component 120. The cavity 110 is used to accommodate the lithium battery, and the control component 120 can control the baking component 130 to bake the lithium battery in multiple process steps. Among them, the highest process step pressure of the current process step is greater than the highest process step pressure of the next process step, and the lowest process step pressure of the current process step is equal to the lowest process step pressure of the next process step. The above-mentioned lithium battery vacuum baking device 100 can control the highest process step pressure of each process step, so that the highest process step pressures of each process step decrease in sequence, thereby improving the baking efficiency and baking consistency.

[0076] Optionally, in an implementable manner of the embodiments of the present application, it further includes a vacuum component 140 electrically connected to the control component 120. The vacuum component 140 is used to extract the mixed gas in the cavity 110 so that the pressure in the cavity 110 drops to the lowest process step pressure. With such a setting, multiple cycles of drying can be performed in one process step, or the pressure in the cavity 110 can meet the lowest process step pressure of the next process step when switching process steps.

[0077] Optionally, in an implementable manner of the embodiments of the present application, it further includes an inflation component 150 electrically connected to the control component 120. The inflation component 150 is used to add dry gas to the cavity so that the pressure in the cavity 110 reaches the preset dry pressure. Inflation drying is performed between two cycles of the same process step and between two adjacent process steps, and then combined with the vacuum component for suction, the water vapor in the cavity can be removed and the baking efficiency can be improved.

[0078] It should be noted that in this embodiment, the structures of the control component 120, the baking component 130, the vacuum component 140, and the gas filling component 150 are not limited, as long as their corresponding functions can be realized.

[0079] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for vacuum baking a lithium battery, characterized in that, The baking method includes multiple steps. In the first step of baking the lithium battery in the cavity of the baking device, the first step is the current step. Obtain the baking time required for the pressure in the cavity to rise to the maximum step pressure of the current step. If the baking time is greater than the preset time, end the current step. The maximum step pressure of the current step is greater than the maximum step pressure of the next step, the minimum step pressure of the current step is equal to the minimum step pressure of the next step, and the maximum step pressure of the first step is the highest value among the multiple steps.

2. The method for vacuum baking of a lithium battery according to claim 1, wherein The method further includes: If the baking time is less than or equal to the preset time, lower the pressure in the cavity to the minimum step pressure of the current step and bake the lithium battery again.

3. The method for vacuum baking a lithium battery according to claim 2, wherein The step of lowering the pressure in the cavity to the minimum step pressure of the current step includes: Introduce dry gas into the cavity until the pressure in the cavity reaches the preset dry pressure of the current step. After the preset time, extract the mixed gas until the pressure in the cavity drops to the minimum step pressure of the current step.

4. The method for vacuum baking a lithium battery according to claim 1, characterized in that, The step of entering the next step includes: Introduce dry gas into the cavity until the pressure in the cavity reaches the preset dry pressure of the next step. After the preset time, extract the mixed gas until the pressure in the cavity drops to the minimum step pressure of the next step. Bake the lithium battery in the next step.

5. The method for vacuum baking a lithium battery according to claim 1, wherein The method further includes: Extract the mixed gas in the cavity until the pressure in the cavity drops to the minimum step pressure of the current step. Take out the baked lithium battery.

6. The method for vacuum baking a lithium battery according to claim 1, wherein, The method further includes: Obtain the baking pressure function of the lithium battery and determine the maximum step pressure of each step according to the baking pressure function.

7. The method for vacuum baking a lithium battery according to claim 6, wherein, The step of obtaining the baking pressure function of the lithium battery includes: Collect the pressure data at each baking moment from the minimum step pressure to the maximum step pressure during the baking of the lithium battery. Use a computer to obtain the baking pressure function according to the corresponding relationship between the pressure data and the baking moment.

8. A lithium battery vacuum baking device, characterized in that, It includes a cavity, a control component, and a baking component electrically connected to the control component. The cavity is used to accommodate the lithium battery, and the control component can control the baking component to bake the lithium battery in multiple steps. Among them, the maximum step pressure of the step is determined according to the baking pressure function of the lithium battery based on time. The maximum step pressure of the current step is greater than the maximum step pressure of the next step, and the minimum step pressure of the current step is equal to the minimum step pressure of the next step. Obtain the baking time required for the pressure in the cavity to rise to the maximum step pressure of the current step. If the baking time is less than or equal to the preset time, lower the pressure in the cavity to the minimum step pressure of the current step and bake the lithium battery again. If the baking time is greater than the preset time, the baking of the current step ends, and enter the next step or end the baking.

9. The lithium battery vacuum baking device according to claim 8, wherein, It further includes a vacuum component electrically connected to the control component, and the vacuum component is used to extract the mixed gas in the cavity so as to reduce the pressure in the cavity to the lowest working step pressure.

10. The lithium battery vacuum baking device according to claim 9, wherein It further includes an inflation component electrically connected to the control component, and the inflation component is used to add dry gas to the cavity so as to make the pressure in the cavity reach the preset dry pressure.

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