CN114050321A - Baking process and baking device for lithium ion battery - Google Patents
Baking process and baking device for lithium ion battery Download PDFInfo
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- CN114050321A CN114050321A CN202111388291.2A CN202111388291A CN114050321A CN 114050321 A CN114050321 A CN 114050321A CN 202111388291 A CN202111388291 A CN 202111388291A CN 114050321 A CN114050321 A CN 114050321A
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- pressure value
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- 238000000034 method Methods 0.000 title claims abstract description 48
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 238000001035 drying Methods 0.000 claims abstract description 31
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The embodiment of the invention provides a baking process and a baking device for a lithium ion battery, and relates to the field of battery processing. The baking process of the lithium ion battery comprises the steps of vacuumizing the inside of an oven until the pressure inside the oven reaches a first preset pressure value; heating the battery for a first preset time to reach a preset temperature value; introducing a preset amount of drying gas until the internal pressure of the drying oven reaches a second preset pressure value; and pumping out the gas in the oven until the pressure in the oven reaches the first preset pressure value again, wherein the second preset pressure value is greater than the first preset pressure value, and the process saves the baking time and improves the baking efficiency due to the elimination of the preheating step.
Description
Technical Field
The invention relates to the technical field of battery processing, in particular to a baking process and a baking device for a lithium ion battery.
Background
In the manufacturing process of the lithium ion battery, the battery core needs to be baked to remove water, and the water content in the battery core is removed to a qualified range.
The existing baking process has a battery preheating process, the general preheating time is 1-2 hours, the preheating time is too long, the production efficiency is low, in addition, in the preheating process, the gas in the closed box body is heated and expanded, the pressure in a cavity is increased, the water evaporation speed is slowed down, and the baking efficiency is also reduced.
Disclosure of Invention
Objects of the present invention include, for example, providing a lithium ion battery baking process that can improve battery baking efficiency.
The invention also aims to provide a lithium ion battery device which can improve the battery baking efficiency.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a lithium ion battery baking process, which comprises the steps of vacuumizing the inside of an oven until the pressure inside the oven reaches a first preset pressure value;
heating the battery for a first preset time to reach a preset temperature value;
introducing a preset amount of drying gas until the internal pressure of the drying oven reaches a second preset pressure value;
and pumping out the gas in the oven until the pressure in the oven reaches the first preset pressure value again, wherein the second preset pressure value is greater than the first preset pressure value.
Optionally, after the step of pumping out the gas inside the oven until the pressure inside the oven reaches the first preset pressure value again, the method further includes:
and keeping the pressure in the oven at the first preset pressure value for a second preset time.
Optionally, after the step of maintaining the internal pressure of the oven at the first preset pressure value for the second preset time, the step of introducing the preset amount of the dry gas until the internal pressure of the oven reaches the second preset pressure value until the step of maintaining the internal pressure of the oven at the first preset pressure value for the second preset time is repeatedly performed, and the battery is stopped being heated until the heating time of the battery reaches the preset total time.
Optionally, after the step of introducing a predetermined amount of drying gas until the internal pressure of the oven reaches a second predetermined pressure value, the method further includes:
keeping the battery heated for a third preset time.
Optionally, the third preset time period is 5 to 10 minutes.
Optionally, the first preset pressure value is 50-200 pa, the first preset time is 20-30 minutes, and the preset temperature value is 90-100 ℃.
Optionally, the second preset pressure value is 10000-.
Optionally, the method further includes: and when the step of heating the battery for the first preset time reaches the preset temperature value, starting to record the heating time, and when the heating time reaches the preset total time, stopping heating the battery.
Optionally, the preset total time is 5 to 8 hours.
The embodiment of the invention also provides a lithium ion battery device for realizing the baking process of the lithium ion battery, which comprises a heating plate, an oven and a vacuum pump, wherein the heating plate is arranged in the oven and positioned at the bottom of the battery and used for heating the battery;
the vacuum pump is arranged outside the oven and used for vacuumizing the inside of the oven.
The lithium ion battery baking process and the lithium ion battery device of the embodiment of the invention have the beneficial effects of, for example: before the battery is heated, the battery is firstly placed into an oven, then the inside of the oven is vacuumized by a vacuum pump until the pressure inside the oven reaches a first preset pressure value, and at the moment, the pressure inside the oven is small, so that the influence on the speed of water evaporation is small, and the baking efficiency is convenient to improve; after the first preset pressure value is reached in the oven, heating the battery for a first preset time until the temperature in the oven reaches a preset temperature value, wherein in the process, relatively more water in the battery is evaporated into the oven due to the fact that the pressure in the oven is lower; then let in the dry gas of predetermined volume until oven internal pressure reaches the second and predetermine the pressure value, let in dry gas and make the moisture mixture that dry gas and battery evaporate out form the mist after, take out this mist inside the oven until oven internal pressure reaches first predetermined pressure value once more, this process just takes out the moisture inside the oven to once dried has been carried out the battery. The preheating step is omitted in the process, so that the baking time is saved, the baking efficiency is improved, and the mixed gas is pumped out after the dry gas and the water are mixed for many times, so that the battery drying effect is better.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a baking process of a lithium ion battery in an embodiment of the present application;
FIG. 2 is a flowchart of step S31 in the embodiment of the present application;
FIG. 3 is a flowchart of step S21 in the embodiment of the present application;
fig. 4 is a schematic structural diagram of a baking device for a lithium ion battery in an embodiment of the present application.
Icon: 100-a lithium ion battery baking device; 110-a heating plate; 120-oven.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The inventor of this application discovers, toasts the in-process at the battery, and the battery preheating time overlength can lead to production efficiency low to preheating the in-process, the gas in the airtight box is heated the inflation, increases pressure in the cavity, has the effect of slowing down to moisture evaporation rate, also can lead to toasting the reduction of efficiency. In order to solve the problem of low battery baking efficiency, the embodiment provides a baking process for a lithium ion battery.
Referring to fig. 1, the baking process of the lithium ion battery provided in this embodiment includes:
and step S1, vacuumizing the inside of the oven 120 until the pressure inside the oven 120 reaches a first preset pressure value.
Before beginning to heat the battery, at first put into oven 120 with the battery, utilize the vacuum pump to carry out evacuation to oven 120 inside afterwards until oven 120 internal pressure reaches first preset pressure value, the pressure of oven 120 inside this moment is less, and is less to the speed influence of moisture evaporation to be convenient for promote stoving efficiency.
And step S2, heating the battery for a first preset time to reach a preset temperature value.
After the first preset pressure value is reached inside the oven 120, heating the battery for a first preset time until the temperature inside the oven 120 reaches a preset temperature value, wherein in the process, relatively more water inside the battery is evaporated into the oven 120 due to the fact that the pressure inside the oven 120 is smaller; the control of the preset temperature value may be a control of the heating device to precisely control the temperature.
Step S3, a preset amount of drying gas is introduced until the internal pressure of the oven 120 reaches a second preset pressure value.
In the process of introducing the drying gas, the pressure inside the oven 120 is monitored, and here, a pressure detection device, such as a pressure monitor, a pressure detector, etc., may be used, as long as the pressure inside the oven 120 can be monitored in real time. When the internal pressure of the oven 120 reaches the second preset pressure value, the introduction of the drying gas is stopped, that is, the internal pressure of the oven 120 is controlled to control the preset amount of introduction of the drying gas, when the internal pressure of the oven 120 reaches the second preset pressure value, the drying gas with the preset amount is introduced, the preset amount in the oven can refer to the preset volume, and the drying gas can be nitrogen and the like.
Step S4, pumping out the gas inside the oven 120 until the pressure inside the oven 120 reaches the first preset pressure value again, wherein the second preset pressure value is greater than the first preset pressure value.
After the drying gas is introduced to mix the drying gas with the water evaporated from the battery to form mixed gas, the mixed gas in the oven 120 is extracted until the internal pressure of the oven 120 reaches the first preset pressure value again, and the water in the oven 120 is extracted in the process, so that the battery is dried once.
After step S4, the method further includes:
and step S5, maintaining the pressure inside the oven 120 at the first preset pressure value for a second preset time.
After the internal pressure of the oven 120 reaches the first preset pressure value again, the internal pressure of the oven 120 is kept at the first preset pressure value for a second preset time, and in the process, because the internal pressure of the oven 120 is kept at a lower state again, the moisture in the battery is easily evaporated into the oven 120, so that the moisture in the battery is easily evaporated again.
After the step S5, the step S3 is repeatedly performed until the step S5, and the heating of the battery is stopped until the battery heating time period reaches the preset total time period.
And repeatedly executing the step S3 until the step S5, so that the moisture in the battery can be evaporated for multiple times, the moisture content in the battery is reduced to the maximum extent to achieve a better drying effect, and when the heating time of the battery reaches the preset total time, the battery is stopped being heated, and the drying is completed.
As shown in fig. 2, after step S3, the method further includes:
and a substep S31 of keeping the battery heated for a third preset time period.
Keeping the battery heating for the third preset time after the drying gas is introduced, so that the drying gas and the moisture in the oven 120 can be conveniently mixed, and the drying gas and the moisture in the oven 120 are uniformly mixed. Preferably, the third predetermined time period is 5-10 minutes, and the battery is kept heated for 5-10 minutes after the drying gas is introduced, so that the drying gas and the water in the oven 120 are uniformly mixed.
Preferably, the first preset pressure value is 50-200 pa, the inside of the oven 120 is vacuumized by using a vacuum pump until the pressure inside the oven 120 reaches 50-200 pa, and at this time, the pressure inside the oven 120 is small, and the influence on the evaporation speed of water is small, so that the baking efficiency is improved.
Preferably, the first preset time is 20-30 minutes, the preset temperature value is 90-100 ℃, after the temperature inside the oven 120 reaches 50-200 Pa, the battery is heated for 20-30 minutes until the temperature inside the oven 120 reaches 90-100 ℃, and in the process, relatively more water inside the battery is evaporated into the oven 120 due to the smaller pressure inside the oven 120.
Preferably, the second predetermined pressure value is 10000-.
In the circulation process from step S3 to step S5, after the drying gas is introduced to mix the drying gas with the moisture evaporated from the battery to form a mixed gas, the mixed gas inside the oven 120 is pumped out until the pressure inside the oven 120 is reduced from 10000-.
Preferably, the second predetermined period of time is 20-30 minutes, and after the pressure inside the oven 120 reaches 50-200 pa again, the pressure inside the oven 120 is maintained at 50-200 pa for 20-30 minutes, during which, since the pressure inside the oven 120 is maintained at a lower state again, the moisture inside the battery is easily evaporated to the inside of the oven 120, so as to facilitate the re-evaporation of the moisture inside the battery.
In addition, as shown in fig. 3, the baking process for the lithium ion battery provided in this embodiment further includes: when the step S2 is started, the substep S21 of starting recording the heating time period is performed, and when the heating time period reaches the preset total time period, the heating of the battery is stopped.
Before the battery is heated for 20-30 minutes and the temperature in the oven 120 reaches 90-100 ℃, the heating time is recorded, when the heating time reaches the preset total time, the battery is stopped being heated, the overall heating time is controlled, so that the battery can be heated reasonably for a long time, and the battery is not easily damaged due to the overlong baking time.
In this embodiment, the preset total time period is 5-8 hours.
The preset total time is determined according to different sample batteries tested before actual baking, the preset baking heating time range of the battery with the size is determined through the sample batteries with different sizes, and the baking time of the battery with the corresponding size is controlled according to the preset baking heating time range, for example, the preset total time of the battery with a smaller size is set to be 5-6 hours, and the preset total time of the battery with a larger size is set to be 7-8 hours.
Referring to fig. 4, the present embodiment further provides a lithium ion battery baking apparatus 100 for implementing the above-mentioned lithium ion battery baking process, where the lithium ion battery baking apparatus 100 includes a heating plate 110, an oven 120, and a vacuum pump (not shown in the figure), and the heating plate 110 is disposed inside the oven 120 and at the bottom of the battery for heating the battery; the vacuum pump is disposed outside the oven 120 and is used for evacuating the inside of the oven 120.
For example, in step S1, the inside of the oven 120 is evacuated by the vacuum pump until the pressure inside the oven 120 reaches 50-200 pa; at step S4, the gas inside the oven 120 is evacuated by the vacuum pump until the pressure inside the oven 120 reaches 50-200 pa again.
In step S2, the battery is heated for 20-30 minutes to 90-100 ℃, the preset temperature value of 90-100 ℃ can be controlled by controlling the temperature of the heating plate 110 to accurately control the temperature inside the oven 120, and the temperature of the heating plate 110 can be controlled by using a PID analog quantity control module; the heating temperature of the heating plate 110 and the temperature inside the oven 120 can be controlled by introducing oil into the heating plate 110 and controlling the temperature of the oil.
According to the lithium ion battery baking process and the lithium ion battery baking device 100 provided by the embodiment, the working principle of the lithium ion battery baking process and the lithium ion battery baking device 100 is as follows: after the battery is placed in the oven 120, firstly, the inside of the oven 120 is vacuumized by a vacuum pump until the pressure inside the oven 120 reaches 50-200 Pa, at the moment, the pressure inside the oven 120 is lower, so that the moisture inside the battery is evaporated, then, the battery is heated for 20-30 minutes to reach 90-100 ℃, so that the moisture inside the battery is evaporated to the inside of the oven 120, then, the drying gas is introduced until the pressure inside the oven 120 reaches 10000-; then pumping out the mixed gas of the drying gas and the moisture in the oven 120 through a vacuum pump until the pressure in the oven 120 reaches 50-200 Pa again, and keeping the battery heated for 20-30 minutes to discharge the moisture into the oven 120 again; through the process of introducing dry gas and pumping out mixed gas for many times, the battery is dried for many times, and the drying effect is improved.
In summary, the embodiment of the invention provides a lithium ion battery baking process and a lithium ion battery device, which can be used for heating a battery in a vacuum state by eliminating a preheating step, so that the evaporation of water in the battery is facilitated, the baking time is saved, and the baking efficiency is improved; and the mixed gas is pumped out by introducing the dry gas and mixing the dry gas with the water for many times, so that the drying effect of the battery is better.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A lithium ion battery baking process is characterized by comprising the following steps:
vacuumizing the inside of the oven until the pressure inside the oven reaches a first preset pressure value;
heating the battery for a first preset time to reach a preset temperature value;
introducing a preset amount of drying gas until the internal pressure of the drying oven reaches a second preset pressure value;
and pumping out the gas in the oven until the pressure in the oven reaches the first preset pressure value again, wherein the second preset pressure value is greater than the first preset pressure value.
2. The lithium ion battery baking process of claim 1, further comprising, after the step of pumping out the gas inside the oven until the pressure inside the oven reaches the first preset pressure value again:
and keeping the pressure in the oven at the first preset pressure value for a second preset time.
3. The lithium ion battery baking process of claim 2, wherein after the step of maintaining the internal pressure of the oven at the first preset pressure value for the second preset duration, the step of introducing the preset amount of the drying gas until the internal pressure of the oven reaches the second preset pressure value is repeatedly performed until the step of maintaining the internal pressure of the oven at the first preset pressure value for the second preset duration, and the heating of the battery is stopped until the heating duration of the battery reaches the preset total duration.
4. The lithium ion battery baking process of claim 1, further comprising, after the step of introducing a predetermined amount of drying gas until the internal pressure of the oven reaches a second predetermined pressure value:
keeping the battery heated for a third preset time.
5. The lithium ion battery baking process of claim 4,
the third preset time is 5-10 minutes.
6. The lithium ion battery baking process of claim 1,
the first preset pressure value is 50-200 Pa, the first preset time is 20-30 minutes, and the preset temperature value is 90-100 ℃.
7. The lithium ion battery baking process of claim 1,
the second preset pressure value is 10000-.
8. The lithium ion battery baking process of claim 1, further comprising: and when the step of heating the battery for the first preset time reaches the preset temperature value, starting to record the heating time, and when the heating time reaches the preset total time, stopping heating the battery.
9. The lithium ion battery baking process of claim 8, wherein the preset total time period is 5-8 hours.
10. A baking device for implementing the lithium ion battery baking process according to any one of claims 1 to 9, wherein the device comprises a heating plate, an oven and a vacuum pump, the heating plate is arranged in the oven and positioned at the bottom of the battery for heating the battery;
the vacuum pump is arranged outside the oven and used for vacuumizing the inside of the oven.
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| CN202111388291.2A CN114050321A (en) | 2021-11-22 | 2021-11-22 | Baking process and baking device for lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659341A (en) * | 2022-03-02 | 2022-06-24 | 上海兰钧新能源科技有限公司 | Control method for baking lithium ion battery |
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| CN109888366A (en) * | 2019-01-21 | 2019-06-14 | 南京国轩电池有限公司 | A kind of stage baking process of pole group moisture of lithium ion battery |
| WO2021082448A1 (en) * | 2020-06-05 | 2021-05-06 | 广州理文科技有限公司 | Apparatus for ultrasonic wave-assisted drying of lithium battery electrolyte, and drying method |
| CN113488701A (en) * | 2021-07-07 | 2021-10-08 | 湖北亿纬动力有限公司 | Baking method for aluminum-shell lithium ion battery |
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2021
- 2021-11-22 CN CN202111388291.2A patent/CN114050321A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888366A (en) * | 2019-01-21 | 2019-06-14 | 南京国轩电池有限公司 | A kind of stage baking process of pole group moisture of lithium ion battery |
| WO2021082448A1 (en) * | 2020-06-05 | 2021-05-06 | 广州理文科技有限公司 | Apparatus for ultrasonic wave-assisted drying of lithium battery electrolyte, and drying method |
| CN113488701A (en) * | 2021-07-07 | 2021-10-08 | 湖北亿纬动力有限公司 | Baking method for aluminum-shell lithium ion battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114659341A (en) * | 2022-03-02 | 2022-06-24 | 上海兰钧新能源科技有限公司 | Control method for baking lithium ion battery |
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