CN115169092A - Vacuum baking tunnel furnace for soft package lithium battery and production process thereof - Google Patents
Vacuum baking tunnel furnace for soft package lithium battery and production process thereof Download PDFInfo
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- CN115169092A CN115169092A CN202210724902.4A CN202210724902A CN115169092A CN 115169092 A CN115169092 A CN 115169092A CN 202210724902 A CN202210724902 A CN 202210724902A CN 115169092 A CN115169092 A CN 115169092A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/18—Manufacturability analysis or optimisation for manufacturability
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a production method of a soft package lithium battery, which comprises the steps of establishing a simulation module library for producing the soft package lithium battery, wherein the simulation module library comprises simulation models of a plurality of production devices of the soft package lithium battery, and selecting a plurality of models of the production devices to be simulated according to the simulation module library; selecting parameters of relevant equipment required for baking as variables, wherein the parameters comprise temperature distribution, temperature change and gas composition change in a baking space in the baking process; generating a flow of setting an optimal baking parameter by simulating the production process of the soft-package lithium battery, wherein the final baking parameter is that the moisture content in the positive and negative pole pieces is less than a preset value in the shortest time; setting an expected value of the moisture content according to a simulation result of the production process, verifying a baking process corresponding to the setting of the baking parameters through a baking experiment, judging whether the moisture content in the positive and negative pole pieces reaches the expected value, evaluating the baking parameters and the baking process according to a judgment result, and carrying out production arrangement according to an evaluation result.
Description
Technical Field
The invention relates to the technical field of battery cell baking, in particular to a vacuum baking tunnel furnace for a soft package lithium battery and a production process thereof.
Background
In the production process of the lithium ion battery cell, moisture in the reducing material and the manufacturing environment needs to be removed. The lower the moisture content in the material and the environment, the better the quality of the battery cell. At present, in the production of the battery cell industry, particularly, the battery cell is baked before liquid injection, so that the moisture in the battery cell is reduced, and the product quality is ensured. The existing oven operation flow is as follows: the polymer battery cell is arranged in the material box, and the air bag faces upwards; setting operation steps (mainly comprising three steps of heating, vacuumizing and nitrogen releasing) after the materials are loaded; during heating, filtered air is heated by blowing air and then is placed into the box body, enters the laminated core through the air bag, and takes out moisture inside the laminated core, mainly on the positive and negative pole pieces, so that the aim of removing moisture is fulfilled.
In the production process of the lithium battery, the baking of the battery core is a very important process, and the purpose of the process is to remove moisture in the battery core, particularly on the pole piece, and prevent potential safety hazards. There are many factors that affect the performance of lithium batteries, such as material types, positive and negative electrode compacted densities, moisture, coating surface density, electrolyte amount, etc., where the water content has a crucial influence on the performance of lithium batteries, and is a key factor that needs to be strictly controlled in the production process of lithium batteries. The first charge-discharge capacity, internal resistance, battery cycle life and battery volume of the lithium battery all have important relations with the water content. Excessive moisture can cause the decomposition of lithium salt in the electrolyte, and meanwhile, the electrolyte has certain corrosion damage effects on the anode and cathode materials and the current collector. Moreover, when the water content is excessive, the excess water continues to react with LiPF6 to generate HF gas, causing swelling, resulting in a decrease in cycle performance and safety performance of the battery. Therefore, the moisture inside the battery is strictly controlled in the production process of the lithium battery.
But the baking of the battery cell in the current industry has the following problems: and (1) the baking time is long. At least 36 hours, and even more than 72 hours required by some enterprises. (2) the baking effect is poor. After baking, the battery core, particularly the positive and negative pole pieces, still contains a large amount of moisture. And (3) the energy consumption is high. One small oven power is 9.8KW, one large oven power is 24KW, the working time is long, the number of ovens is large, and the whole electric energy consumption is quite remarkable.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention discloses a production method of a soft package lithium battery, which comprises the following steps:
step 1: establishing a simulation module library for the production of the soft package lithium batteries, wherein the simulation module library comprises simulation models of a plurality of production devices of the soft package lithium batteries, and selecting a plurality of models of the production devices to be simulated according to the simulation module library;
step 2: after selecting the types and parameters of other parts, selecting parameters of relevant equipment required for baking as variables, wherein the parameters comprise temperature distribution, temperature change and gas composition change in a baking space in the baking process;
step 3, generating a flow of setting an optimal baking parameter by simulating the production process of the soft package lithium battery, wherein the final baking parameter is that the moisture content in the positive and negative pole pieces is smaller than a preset value in the shortest time;
step 4, setting an expected value of the moisture content according to the simulation result of the production process in the step 3, verifying through a baking experiment that a corresponding baking process is set by adopting the baking parameters generated in the step 3, judging whether the moisture content in the positive and negative electrode plates reaches the expected value, and then evaluating the baking parameters and the baking process according to the judgment result;
and 5, when the evaluation result meets the expectation of a producer, executing the baking process of the battery according to the simulated production process, and processing the soft package lithium battery cell after baking is finished.
Still further, the step 1 further comprises: the simulation model includes the model of the required relevant equipment that toasts soft packet of lithium cell, it is a plurality of simulation model and reality part parameter one-to-one.
Still further, the step 3 further comprises: the process of generating the optimal baking parameter setting comprises the steps of selecting the heating time and temperature of the baking tunnel furnace, the parameters of vacuum extraction and whether dry high-temperature gas needs to be introduced or not according to the specific parameters of the soft package lithium battery.
Further, the step 4 of evaluating the baking parameters and the baking process according to the determination result further comprises: when moisture content in the positive and negative pole pieces is greater than an expected value, then carry out the baking experiment again and monitor the temperature and the gas composition of the baking process by the manual work and check whether the production facility takes place the abnormal conditions simultaneously, when moisture content in the positive and negative pole pieces is less than the expected value, assess the long and energy consumption condition of the baking time of soft packet of lithium cell.
Further, the manually monitoring the temperature and gas composition of the baking process and verifying whether the production equipment is abnormal further comprises: the gas and air pressure detection device is arranged in the baking tunnel furnace, a plurality of temperature acquisition points are arranged in the baking tunnel furnace, and whether the drying effect caused by equipment failure cannot reach the design expectation is judged by comparing the gas components and the temperature distribution in the baking tunnel furnace.
The invention also discloses a vacuum baking tunnel furnace for the soft package lithium battery, which adopts the baking process designed by the method to bake the soft package lithium battery, and comprises an intelligent control setting system, a simulation module library and a control module library, wherein the simulation module library comprises simulation models of a plurality of production devices of the soft package lithium battery, and a plurality of models of the production devices to be simulated are selected according to the simulation module library;
the parameter setting module is used for selecting parameters of relevant equipment required by baking as variables after selecting the types and the parameters of other parts, wherein the parameters comprise temperature distribution, temperature change and gas composition change in a baking space in the baking process;
the baking process design module is used for generating a process of setting the optimal baking parameters by simulating the production process of the soft-package lithium battery, wherein the final baking parameters are that the moisture content in the positive and negative pole pieces is less than a preset value in the shortest time;
the baking result evaluation module is used for setting an expected value of the moisture content according to a simulation result of the production process in the baking process design module, verifying a baking process corresponding to the baking parameter setting generated by the baking process design module through a baking experiment, judging whether the moisture content in the positive and negative pole pieces reaches the expected value or not, and evaluating the baking parameter and the baking process according to a judgment result;
and the baking execution module executes the baking process of the battery according to the simulated production process after the evaluation result meets the expectation of a producer, and processes the soft package lithium battery cell after the baking is finished.
Still further, the simulation model database further comprises: the simulation model includes the model of the required relevant equipment that toasts soft packet of lithium cell, it is a plurality of the simulation model is corresponding with reality part parameter one-to-one.
Further, the baking process design module further comprises: the process of generating the optimal baking parameter setting comprises the steps of selecting the heating time and temperature of the baking tunnel furnace, the parameters of vacuum extraction and whether dry high-temperature gas needs to be introduced or not according to the specific parameters of the soft package lithium battery.
Further, the evaluation of the baking parameters and the baking process according to the determination result in the baking result evaluation module further comprises: when moisture content in the positive and negative pole pieces is greater than an expected value, then carry out the baking experiment again and monitor the temperature and the gas composition of the baking process by the manual work and check whether the production facility takes place the abnormal conditions simultaneously, when moisture content in the positive and negative pole pieces is less than the expected value, assess the long and energy consumption condition of the baking time of soft packet of lithium cell.
Further, the manually monitoring the temperature and gas composition of the baking process and verifying whether the production equipment is abnormal further comprises: the gas and air pressure detection device is arranged in the baking tunnel furnace, a plurality of temperature acquisition points are arranged in the baking tunnel furnace, and whether the drying effect caused by equipment failure cannot reach the design expectation is judged by comparing the gas components and the temperature distribution in the baking tunnel furnace.
Compared with the prior art, the invention has the beneficial effects that: in the production simulation of the soft package lithium battery, particularly in the baking link, the selected mode is simulated through simulation, and the optimal technological process in the lithium battery production process is obtained through comparing different baking modes.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. In the drawings, like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a flow chart of a method of producing a soft-packed lithium battery of the present invention.
Detailed Description
Example one
A method for producing a soft-packed lithium battery as shown in fig. 1, the method comprising the steps of:
step 1: establishing a simulation module library for the production of the soft package lithium batteries, wherein the simulation module library comprises simulation models of a plurality of production devices of the soft package lithium batteries, and selecting a plurality of models of the production devices to be simulated according to the simulation module library;
step 2: after selecting the types and parameters of other parts, selecting parameters of relevant equipment required for baking as variables, wherein the parameters comprise temperature distribution, temperature change and gas composition change in a baking space in the baking process;
step 3, generating a flow of setting an optimal baking parameter by simulating the production process of the soft-package lithium battery, wherein the final baking parameter is that the moisture content in the positive and negative pole pieces is less than a preset value in the shortest time;
step 4, setting an expected value of the moisture content according to the simulation result of the production process in the step 3, verifying through a baking experiment that a corresponding baking process is set by adopting the baking parameters generated in the step 3, judging whether the moisture content in the positive and negative electrode plates reaches the expected value, and then evaluating the baking parameters and the baking process according to the judgment result;
and 5, when the evaluation result meets the expectation of a producer, executing the baking process of the battery according to the simulated production process, and processing the soft package lithium battery cell after baking is finished.
Still further, the step 1 further comprises: the simulation model includes the model of the required relevant equipment that toasts soft packet of lithium cell, it is a plurality of the simulation model is corresponding with reality part parameter one-to-one.
Still further, the step 3 further comprises: the process of generating the optimal baking parameter setting comprises the steps of selecting the heating time and temperature of the baking tunnel furnace, the parameters of vacuum extraction and whether dry high-temperature gas needs to be introduced or not according to the specific parameters of the soft package lithium battery.
Further, the step 4 of evaluating the baking parameters and the baking process according to the determination result further comprises: when moisture content in the positive and negative pole pieces is greater than an expected value, then carry out the baking experiment again and monitor the temperature and the gas composition of the baking process by the manual work and check whether the production facility takes place the abnormal conditions simultaneously, when moisture content in the positive and negative pole pieces is less than the expected value, assess the long and energy consumption condition of the baking time of soft packet of lithium cell.
Further, the manually monitoring the temperature and gas composition of the baking process and verifying whether the production equipment is abnormal further comprises: the gas and air pressure detection device is arranged in the baking tunnel furnace, the plurality of temperature acquisition points are arranged in the baking tunnel furnace, and whether the drying effect caused by equipment failure can not reach design expectation is judged by comparing gas components and temperature distribution in the baking tunnel furnace.
The invention also discloses a vacuum baking tunnel furnace for the soft package lithium battery, the vacuum baking tunnel furnace adopts the baking process designed by the method to bake the soft package lithium battery, the vacuum baking tunnel furnace comprises an intelligent control setting system, a simulation module library and a control module library, wherein the simulation module library comprises simulation models of a plurality of production devices of the soft package lithium battery, and a plurality of models of the production devices to be simulated are selected according to the simulation module library;
the parameter setting module is used for selecting parameters of relevant equipment required by baking as variables after selecting the types and the parameters of other parts, wherein the parameters comprise temperature distribution, temperature change and gas composition change in a baking space in the baking process;
the baking process design module is used for generating a process of setting the optimal baking parameters by simulating the production process of the soft-package lithium battery, wherein the final baking parameters are that the moisture content in the positive and negative pole pieces is less than a preset value in the shortest time;
the baking result evaluation module is used for setting an expected value of the moisture content according to a simulation result of the production process in the baking process design module, verifying a baking process corresponding to the setting of the baking parameters generated by the baking process design module through a baking experiment, judging whether the moisture content in the positive and negative pole pieces reaches the expected value or not, and evaluating the baking parameters and the baking process according to a judgment result;
and the baking execution module is used for executing the baking process of the battery according to the simulated production process after the evaluation result accords with the expectation of a producer, and processing the soft package lithium battery cell after the baking is finished.
Still further, the simulation model database further comprises: the simulation model includes the model of the required relevant equipment that toasts soft packet of lithium cell, it is a plurality of simulation model and reality part parameter one-to-one.
Further, the baking process design module further comprises: the process of generating the optimal baking parameter setting comprises the steps of selecting the heating time and temperature of the baking tunnel furnace, the parameters of vacuum extraction and whether dry high-temperature gas needs to be introduced or not according to the specific parameters of the soft package lithium battery.
Furthermore, the evaluation of the baking parameters and the baking process according to the judgment result in the baking result evaluation module further comprises: when moisture content in the positive and negative pole pieces is greater than an expected value, then carry out the baking experiment again and monitor the temperature and the gas composition of the baking process by the manual work and check whether the production facility takes place the abnormal conditions simultaneously, when moisture content in the positive and negative pole pieces is less than the expected value, assess the long and energy consumption condition of the baking time of soft packet of lithium cell.
Further, the manually monitoring the temperature and gas composition of the baking process and verifying whether the production equipment is abnormal further comprises: the gas and air pressure detection device is arranged in the baking tunnel furnace, a plurality of temperature acquisition points are arranged in the baking tunnel furnace, and whether the drying effect caused by equipment failure cannot reach the design expectation is judged by comparing the gas components and the temperature distribution in the baking tunnel furnace.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. It is therefore intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (10)
1. A production method of a soft package lithium battery is characterized by comprising the following steps:
step 1: establishing a simulation module library for the production of the soft package lithium batteries, wherein the simulation module library comprises simulation models of a plurality of production devices of the soft package lithium batteries, and selecting a plurality of models of the production devices to be simulated according to the simulation module library;
and 2, step: after selecting the types and parameters of other parts, selecting parameters of relevant equipment required for baking as variables, wherein the parameters comprise temperature distribution, temperature change and gas composition change in a baking space in the baking process;
step 3, generating a flow of setting an optimal baking parameter by simulating the production process of the soft-package lithium battery, wherein the final baking parameter is that the moisture content in the positive and negative pole pieces is less than a preset value in the shortest time;
step 4, setting an expected value of the moisture content according to the simulation result of the production process in the step 3, verifying through a baking experiment that a corresponding baking process is set by adopting the baking parameters generated in the step 3, judging whether the moisture content in the positive and negative electrode plates reaches the expected value, and then evaluating the baking parameters and the baking process according to the judgment result;
and 5, when the evaluation result meets the expectation of a producer, executing the baking process of the battery according to the simulated production process, and processing the soft package lithium battery cell after baking is finished.
2. The method for producing a lithium pouch according to claim 1, wherein the step 1 further comprises: the simulation model includes the model of the required relevant equipment that toasts soft packet of lithium cell, it is a plurality of the simulation model is corresponding with reality part parameter one-to-one.
3. The method for producing a lithium pouch according to claim 1, wherein said step 3 further comprises: the process of generating the optimal baking parameter setting comprises the steps of selecting the heating time and temperature of the baking tunnel furnace, the parameters of vacuum extraction and whether dry high-temperature gas needs to be introduced or not according to the specific parameters of the soft package lithium battery.
4. The method for producing the soft package lithium battery as claimed in claim 1, wherein the step 4 of evaluating the baking parameters and the baking process according to the judgment result further comprises: when moisture content in positive and negative pole pieces is greater than expected value, then toast the experiment again and monitor whether the check takes place abnormal conditions to production facility simultaneously by artifical temperature and the gas composition to the process of toasting, when moisture content in positive and negative pole pieces is less than expected value, aassessment the long and energy consumption condition of the baking time of soft packet of lithium cell.
5. The method of claim 4, wherein the step of manually monitoring the temperature and gas composition of the baking process and verifying if the production equipment is abnormal further comprises: the gas and air pressure detection device is arranged in the baking tunnel furnace, a plurality of temperature acquisition points are arranged in the baking tunnel furnace, and whether the drying effect caused by equipment failure cannot reach the design expectation is judged by comparing the gas components and the temperature distribution in the baking tunnel furnace.
6. A soft package lithium battery vacuum baking tunnel furnace, the vacuum baking tunnel furnace adopts the baking process designed in the claims 1-5 to bake the soft package lithium battery, the vacuum baking tunnel furnace is characterized by comprising an intelligent control setting system, a simulation module library for establishing soft package lithium battery production, a simulation module library comprising simulation models of production equipment of a plurality of soft package lithium batteries, and a plurality of models of the production equipment to be simulated are selected according to the simulation module library;
the parameter setting module is used for selecting parameters of relevant equipment required by baking as variables after the types and the parameters of other parts are selected, wherein the parameters comprise temperature distribution, temperature change and gas composition change in a baking space in the baking process;
the baking process design module is used for generating a process of setting the optimal baking parameters by simulating the production process of the soft-package lithium battery, wherein the final baking parameters are that the moisture content in the positive and negative pole pieces is less than a preset value in the shortest time;
the baking result evaluation module is used for setting an expected value of the moisture content according to a simulation result of the production process in the baking process design module, verifying a baking process corresponding to the setting of the baking parameters generated by the baking process design module through a baking experiment, judging whether the moisture content in the positive and negative pole pieces reaches the expected value or not, and evaluating the baking parameters and the baking process according to a judgment result;
and the baking execution module executes the baking process of the battery according to the simulated production process after the evaluation result meets the expectation of a producer, and processes the soft package lithium battery cell after the baking is finished.
7. The soft-package lithium battery vacuum baking tunnel furnace of claim 6, wherein the simulation model database further comprises: the simulation model includes the model of the required relevant equipment that toasts soft packet of lithium cell, it is a plurality of the simulation model is corresponding with reality part parameter one-to-one.
8. The vacuum baking tunnel furnace of claim 6, wherein the baking process design module further comprises: the process of generating the optimal baking parameter setting comprises the steps of selecting the heating time and temperature of the baking tunnel furnace, the parameters of vacuum extraction and whether dry high-temperature gas needs to be introduced or not according to the specific parameters of the soft package lithium battery.
9. The vacuum baking tunnel furnace for the soft package lithium batteries according to claim 6, wherein the evaluation of baking parameters and baking processes according to the judgment result in the baking result evaluation module further comprises: when moisture content in the positive and negative pole pieces is greater than an expected value, then carry out the baking experiment again and monitor the temperature and the gas composition of the baking process by the manual work and check whether the production facility takes place the abnormal conditions simultaneously, when moisture content in the positive and negative pole pieces is less than the expected value, assess the long and energy consumption condition of the baking time of soft packet of lithium cell.
10. The vacuum baking tunnel furnace method for soft package lithium batteries according to claim 9, wherein the step of manually monitoring the temperature and gas composition during the baking process and verifying whether the production equipment is abnormal further comprises the steps of: the gas and air pressure detection device is arranged in the baking tunnel furnace, a plurality of temperature acquisition points are arranged in the baking tunnel furnace, and whether the drying effect caused by equipment failure cannot reach the design expectation is judged by comparing the gas components and the temperature distribution in the baking tunnel furnace.
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| CN202210724902.4A CN115169092A (en) | 2022-06-24 | 2022-06-24 | Vacuum baking tunnel furnace for soft package lithium battery and production process thereof |
| CN202211155066.9A CN115310306B (en) | 2022-06-24 | 2022-09-22 | Vacuum baking tunnel furnace for soft-package lithium battery and production process thereof |
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| CN202210724902.4A CN115169092A (en) | 2022-06-24 | 2022-06-24 | Vacuum baking tunnel furnace for soft package lithium battery and production process thereof |
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