CN112197515A - Baking and cooling equipment and baking and cooling method for lithium ion battery cell - Google Patents
Baking and cooling equipment and baking and cooling method for lithium ion battery cell Download PDFInfo
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- CN112197515A CN112197515A CN202011059781.3A CN202011059781A CN112197515A CN 112197515 A CN112197515 A CN 112197515A CN 202011059781 A CN202011059781 A CN 202011059781A CN 112197515 A CN112197515 A CN 112197515A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
- F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
- F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
- F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/003—Handling, e.g. loading or unloading arrangements for articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/12—Drying solid materials or objects by processes not involving the application of heat by suction
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
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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
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Abstract
The invention belongs to the technical field of lithium ion battery production, and particularly relates to a lithium ion battery cell baking and cooling device, which comprises a baking system and a cooling system, wherein the baking system comprises: a plurality of sets of induction coils for generating an alternating magnetic field; a power supply electrically connected to the induction coil; the vacuum accommodating part is used for accommodating a lithium ion battery cell and is arranged in the alternating magnetic field; the cooling system comprises a cold air input assembly connected with the vacuum accommodating part. The invention also relates to a baking and cooling method of the lithium ion battery cell. The invention can rapidly bake the pole piece and the battery cell, not only obviously reduces baking and heating time, but also reduces the consumption of heat energy. The invention also combines the processes of baking the battery cell and cooling after baking into a whole, does not need a transfer process, reduces the time for transferring the battery cell and improves the production efficiency of the battery cell.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery production, and particularly relates to a baking and cooling device and a baking and cooling method for a lithium ion battery cell.
Background
In the production of lithium ion power batteries, the lithium ion cells typically need to be baked before the electrolyte is injected. The traditional baking mode is that a vacuum oven is adopted to bake the electric core, the heating mode is that a traditional heating pipe is used for heating, the electric core is heated to a set temperature through thermal field radiation, and meanwhile, the baking box body is vacuumized to be lower than minus 101KPa, so that the moisture in the electric core is baked. However, the duration of such a baking method is in the order of hours to tens of hours, which severely limits the production efficiency. Moreover, the baked battery core needs to be transferred to a cooling box for cooling, and the vacuum oven and the cooling box are different devices, so that a manipulator needs to be used for transferring, and the operation process is complex.
In view of the above, it is necessary to provide a technical solution to solve the above technical problems.
Disclosure of Invention
One of the objects of the present invention is: the lithium ion battery cell baking and cooling equipment is provided aiming at the defects of the prior art, the heating time can be shortened, the consumption of heat energy is reduced, the battery cell baking and cooling process after baking are combined into a whole, the transfer flow is not needed, and the production efficiency of the battery cell is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a baking and cooling device for a lithium ion cell comprises a baking system and a cooling system,
the baking system comprises:
a plurality of sets of induction coils for generating an alternating magnetic field;
a power supply electrically connected to the induction coil;
the vacuum accommodating part is used for accommodating a lithium ion battery cell and is arranged in the alternating magnetic field;
the cooling system comprises a cold air input assembly connected with the vacuum accommodating part.
As an improvement of the baking and cooling equipment for the lithium ion battery cell, the vacuum accommodating part comprises a sealable tray or a sealable fixture which can accommodate at least one lithium ion battery cell, the inner wall of the vacuum accommodating part is provided with a plurality of grooves, and the vacuum accommodating part is provided with a cold air inlet. In order to improve the vacuum baking efficiency and reduce excessive detection elements, a plurality of battery cells can be arranged in the vacuum accommodating part for baking at the same time. After the lithium ion battery cell toasts qualified, the inside of vacuum accommodation portion is inputed to cold wind input assembly with cold wind from the cold wind air inlet to a plurality of lithium ion battery cells in the cooling vacuum accommodation portion, the setting of recess is used for providing the air inlet and air outlet channel for cold wind, in order to improve lithium ion battery cell's cooling efficiency.
As an improvement of the lithium ion battery cell baking and cooling device, the baking system further comprises a baking box body and a gas input assembly connected with the baking box body, and a plurality of groups of induction coils are accommodated in the baking box body. The gas input assembly is used for continuously inputting dry gas into the baking box body, so that the air pressure inside the baking box body is slightly larger than the external air pressure, and the situation that the air with water vapor outside the baking box body enters the baking box body to influence the baking effect of the lithium ion battery cell can be prevented. The induction coils can be arranged into a plurality of groups, when the equipment is long, the vacuum accommodating part is in the conveying process, if the temperature of the lithium ion battery cell is induced to be lower than a set value, the induction coil of the next station starts to work, and the temperature of the lithium ion battery cell tends to the set value.
The improved baking and cooling equipment for the lithium ion battery cell further comprises a control device, wherein the control device comprises a display and a controller, and the controller is connected with the power supply through signals. The controller controls the cycle, the size and the frequency of the alternating current generated by the power supply, so that the heat productivity of the pole piece current collector in the lithium ion cell is controlled. Because the water content in the positive plate and the negative plate is generally different, the controller can adjust the alternating current generated by the power supply according to the type and the size of the plate. Preferably, the display may be provided on the toasting carriage, or the display may be provided separately from the toasting carriage.
The improved baking and cooling equipment for the lithium ion battery cell further comprises a vacuum control system, wherein the vacuum control system comprises a vacuumizing assembly and a vacuum degree monitoring assembly, the vacuumizing assembly is connected with the vacuum accommodating part and is electrically connected with the controller, and the vacuum degree monitoring assembly is respectively in signal connection with the controller and the display. In practical application, the vacuum degree monitoring assembly is used for monitoring the vacuum degree inside the vacuum containing part and is connected with the display through signals, the display can display the vacuum degree inside the vacuum containing part, and the controller can automatically control the vacuumizing assembly to enable the vacuum degree inside the vacuum containing part to meet actual requirements, so that the closed-loop control of the vacuum degree is realized. Specifically, the controller judges whether the vacuum accommodating part needs to be subjected to vacuum supplement or not after comparing the vacuum value detected by the vacuum degree monitoring assembly with a set value, and the controller can automatically control the vacuumizing assembly to vacuumize the inside of the vacuum accommodating part, so that the closed-loop control of the vacuum degree is realized.
The baking and cooling device for the lithium ion battery cell further comprises a temperature sensor, wherein the temperature sensor is connected with the vacuum accommodating part, and the temperature sensor is respectively in signal connection with the display and the controller. When the actual temperature of the battery cell sensed by the temperature sensor is lower than the set temperature, the controller controls the power supply to be turned on, so that the induction coil works to bake the lithium ion battery cell, and closed-loop control between the temperature and the heating of the induction coil is realized.
The improved baking and cooling equipment for the lithium ion battery cell further comprises a dew point testing system, wherein the dew point testing system comprises a dew point testing component and a dew point monitoring component, the dew point testing component is connected with the vacuum accommodating part, and the dew point monitoring component is in signal connection with the controller and the display respectively. After the baking and cooling of the lithium ion battery cell are basically completed, the dew point inside the vacuum accommodating part is detected through the dew point testing component, the sensed dew point is transmitted to the controller through a signal by the dew point monitoring component, and the controller judges whether the baking of the lithium ion battery cell is qualified or not. The dew point testing component is used for detecting a dew point in a vacuum accommodating part at the tail end of the cooling conveyor belt so as to judge whether the lithium ion battery cell is baked and cooled to be qualified.
The lithium ion battery cell baking and cooling equipment is an improvement of the lithium ion battery cell baking and cooling equipment, and further comprises a conveying system in signal connection with the controller, wherein the conveying system comprises a feeding conveying belt, a baking conveying belt, a cooling conveying belt, a qualified conveying belt and an unqualified conveying belt, the feeding conveying belt is sequentially connected with the baking conveying belt and the cooling conveying belt, the cooling conveying belt is respectively connected with the qualified conveying belt and the unqualified conveying belt, and the unqualified conveying belt is connected with the feeding conveying belt.
As an improvement of the baking equipment for the lithium ion battery cell, the vacuum accommodating part is made of metal. The material of vacuum accommodation portion sets up to metal or the good material of heat conductivity, also can generate heat, and then gives the holding with the heat transfer and in electric core wherein, realizes the rapid heating of electric core.
The second purpose of the invention is: the baking and cooling method for the lithium ion battery cell comprises the following operations: enabling a lithium ion cell to pass through an alternating magnetic field generated by an induction coil, vacuumizing the environment where the lithium ion cell is located, and baking the lithium ion cell; and cooling the lithium ion electric core by cold air.
The improvement of the baking and cooling method of the lithium ion battery cell comprises the following operations:
1) placing the lithium ion battery cell in a vacuum accommodating part, vacuumizing the vacuum accommodating part through an alternating magnetic field generated by an induction coil by the vacuum accommodating part, and baking the lithium ion battery cell;
2) making the actual values of the temperature and the vacuum degree inside the vacuum containing part approach to the set values;
3) cooling and cooling the lithium ion electric core by introducing cold air after baking, and testing the actual dew point of the lithium ion electric core;
4) and calculating the difference value between the actual dew point and the set dew point, and judging whether the baking and cooling of the lithium ion battery cell are finished.
Compared with the prior art, the invention at least has the following beneficial effects: according to the invention, alternating current is provided for the induction coil through the power supply, an alternating magnetic field is generated through the induction coil of the alternating current, the alternating magnetic field enables a current collector of the lithium ion battery pole piece arranged in the vacuum accommodating part to generate eddy current heating, the heat is transferred to the active material layer after the current collector generates heat, so that the fast heating of the pole piece is realized, meanwhile, the vacuum accommodating part starts the vacuumizing treatment, the boiling point of a solvent in the active material layer is reduced, and moist gas is also pumped away along with vacuum, so that the pole piece and the battery cell are fast baked, the baking and heating time is obviously reduced, and the consumption of heat energy is also reduced. The invention also combines the processes of baking the battery cell and cooling after baking into a whole, does not need a transfer process, reduces the time for transferring the battery cell and improves the production efficiency of the battery cell.
Drawings
Fig. 1 is a schematic view of the overall structure of a baking and cooling device for a lithium ion cell in example 1.
Fig. 2 is a schematic structural diagram of a part a of the baking and cooling device for a lithium ion cell in example 1.
Fig. 3 is a signal connection schematic diagram of the baking and cooling device of the lithium ion cell in the embodiment 1.
Fig. 4 is a schematic structural view of a vacuum housing in embodiment 1.
Wherein: the device comprises an induction coil 1, a power supply 2, a vacuum accommodating part 3, a groove 31, a controller 4, a battery core 5, a vacuum pumping assembly 61, a vacuum degree monitoring assembly 62, a temperature sensor 7, a dew point testing assembly 81, a dew point monitoring assembly 82, a conveying system 9, a feeding conveying belt 91, a baking conveying belt 92, a cooling conveying belt 93, a qualified conveying belt 94, a unqualified conveying belt 95, a cold air input assembly 10, a baking box 11 and a gas input assembly 12.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element 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.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1 to 4, the present embodiment provides a baking and cooling apparatus for a lithium ion battery cell, which includes a baking system and a cooling system,
the baking system comprises:
a plurality of sets of induction coils 1 for generating an alternating magnetic field;
a power supply 2 electrically connected to the induction coil 1;
a vacuum accommodating part 3 for accommodating the lithium ion cell 5, which is arranged in the alternating magnetic field;
the cooling system comprises a cold air input assembly 10 connected to the vacuum receiver 3.
According to the invention, alternating current is provided for the induction coil 1 through the power supply 2, the alternating magnetic field is generated by the induction coil 1 of the alternating current, the alternating magnetic field enables the pole piece current collector of the lithium ion battery cell 5 arranged in the vacuum accommodating part 3 to generate eddy current heating, the heat collector transmits the heat to the active material layer after heating, so that the rapid heating of the pole piece is realized, meanwhile, the vacuum accommodating part 3 starts the vacuumizing treatment, the boiling point of a solvent in the active material layer is reduced, and moist gas is also pumped away along with vacuum, so that the pole piece and the battery cell 5 are rapidly baked, the baking and heating time is obviously reduced, and the consumption of heat energy is also reduced. The invention also combines the processes of baking the battery cell 5 and cooling after baking into a whole, does not need a transfer process, reduces the transfer time of the battery cell 5 and improves the production efficiency of the battery cell 5.
Further, the vacuum accommodating part 3 comprises a sealable tray or a sealable fixture which can accommodate at least one lithium ion cell 5, a plurality of grooves 31 are formed in the inner wall of the vacuum accommodating part 3, and the vacuum accommodating part 3 is provided with a cold air inlet. In order to increase the efficiency of the vacuum baking and to reduce the number of detection elements, a plurality of cells 5 may be disposed in the vacuum container 3 and baked at the same time. After the lithium ion cells 5 are baked to be qualified, the cold air input assembly 10 inputs cold air into the vacuum accommodating part 3 from the cold air inlet to cool the lithium ion cells 5 in the vacuum accommodating part 3, and the groove 31 is arranged to provide an air inlet channel and an air outlet channel for the cold air to improve the cooling efficiency of the lithium ion cells 5.
Further, the baking system further comprises a baking box body 11 and a gas input assembly 12 connected with the baking box body 11, and the plurality of groups of induction coils 1 are accommodated in the baking box body 11. The gas input assembly 12 is used for continuously inputting dry gas into the baking box body 11, so that the air pressure inside the baking box body 11 is slightly larger than the external air pressure, and the air with water vapor outside the baking box body 11 can be prevented from entering the baking box body 11 to influence the baking effect of the lithium ion battery cell 5. Wherein, induction coil 1 can set up to a plurality of groups, and when equipment is longer, vacuum container portion 3 is in transportation process, if the temperature of sensing lithium ion battery cell 5 is less than the setting value, induction coil 1 of next station begins work, tends to the setting value with the temperature of lithium ion battery cell 5.
Furthermore, the device also comprises a control device, wherein the control device comprises a display and a controller 4, and the controller 4 is in signal connection with the power supply 2. The controller 4 controls the cycle, the magnitude and the frequency of the alternating current generated by the power supply 2, so as to control the heat productivity of the pole piece current collector in the lithium ion battery cell 5. Since the water content in the positive and negative plates is generally different, the controller 4 can adjust the alternating current generated by the power supply 2 according to the type and size of the plates. Preferably, the display may be provided on the roasting chamber 11, or the display may be provided separately from the roasting chamber 11.
Further, the vacuum control system is further included, the vacuum control system comprises a vacuumizing assembly 61 and a vacuum degree monitoring assembly 62, the vacuumizing assembly 61 is connected with the vacuum accommodating part 3, the vacuumizing assembly 61 is electrically connected with the controller 4, and the vacuum degree monitoring assembly 62 is respectively in signal connection with the controller 4 and the display. In practical application, vacuum monitoring assembly 62 is used for monitoring the inside vacuum of vacuum receiving portion 3 and gives the display through signal connection, and the display can show the inside vacuum of vacuum receiving portion 3, and controller 4 can automatic control evacuation subassembly 61 make the inside vacuum of vacuum receiving portion 3 satisfy actual demand, realizes the closed-loop control of vacuum. Specifically, the controller 4 determines whether the vacuum accommodating part 3 needs to be vacuumized again after comparing the vacuum value detected by the vacuum degree monitoring assembly 62 with a set value, and the controller 4 can automatically control the vacuumizing assembly 61 to vacuumize the inside of the vacuum accommodating part 3, thereby realizing the closed-loop control of the vacuum degree.
Further, the vacuum container further comprises a temperature sensor 7, wherein the temperature sensor 7 is connected with the vacuum container 3, and the temperature sensor 7 is respectively in signal connection with the display and the controller 4. When the temperature sensor 7 senses that the actual temperature of the battery cell 5 is lower than the set temperature, the controller 4 controls the power supply 2 to be turned on, so that the induction coil 1 works to bake the lithium ion battery cell 5, and closed-loop control between the temperature and the heating of the induction coil 1 is realized.
Further, the dew point testing device comprises a dew point testing system, wherein the dew point testing system comprises a dew point testing component 81 and a dew point monitoring component 82, the dew point testing component 81 is connected with the vacuum accommodating part 3, and the dew point monitoring component 82 is in signal connection with the controller 4 and the display respectively. After the baking and cooling of the lithium ion battery cell 5 are basically completed, the dew point testing component 81 detects the dew point inside the vacuum accommodating part 3, the dew point monitoring component 82 transmits the sensed dew point to the controller 4 through a signal, and the controller 4 judges whether the baking of the lithium ion battery cell 5 is qualified. The dew point testing component 81 is used for detecting the dew point in the vacuum accommodating part 3 at the end of the cooling conveyor belt 93 to judge whether the lithium ion battery cell 5 is qualified in baking and cooling.
Further, still include the conveying system 9 with controller 4 signal connection, conveying system 9 includes material loading conveyer belt 91, toasts conveyer belt 92, cooling conveyer belt 93, qualified conveyer belt 94 and unqualified conveyer belt 95, and material loading conveyer belt 91 is connected with toasting conveyer belt 92 and cooling conveyer belt 93 in proper order, and cooling conveyer belt 93 is connected with qualified conveyer belt 94 and unqualified conveyer belt 95 respectively, and unqualified conveyer belt 95 is connected with material loading conveyer belt 91. The controller 4 can control the running speed of each conveyor.
Example 2
The present embodiment provides a method for baking and cooling a lithium ion battery cell by using the baking and cooling apparatus of embodiment 1, including the following operations:
s1, the battery cell 5 is fixed in the vacuum container 3 by the feeding conveyor belt 91;
s2, the controller 4 controls the vacuum accommodating part 3 to the baking conveyor belt 92, the baking conveyor belt 92 conveys the vacuum accommodating part 3 into the baking box body 11, the controller 4 controls the power supply 2 to electrify the induction coil 1 to form an alternating magnetic field, and the vacuum accommodating part 3 and the battery cell 5 current collector therein are rapidly heated; the controller 4 controls the vacuumizing assembly 61 to vacuumize the interior of the vacuum accommodating part 3 to the set vacuum degree less than or equal to-101 Kpa; the gas input assembly 12 operates to deliver dry positive pressure gas into the baking oven chamber 11;
s3, after baking for a period of time, sensing the temperature in the vacuum accommodating part 3 by using the temperature sensor 7, when the temperature reaches the set temperature, transmitting a signal to the controller 4, and controlling the alternating power supply 2 to stop working by the controller 4; when the vacuum accommodating part 3 is in operation, if the temperature is reduced, the next group of induction coils 1 starts to work, and the lithium ion battery cells 5 are heated and baked to enable the temperature to approach the set temperature;
s4, controlling the running speed of the baking conveyor belt 92 by the controller, after baking is completed, conveying the vacuum accommodating part 3 to the cooling conveyor belt 93 by the baking conveyor belt 92, and introducing 20-25 ℃ dry gas with a dew point of-73 ℃ into a cold air inlet of the vacuum accommodating part 3 by using the cold air input assembly 10 to cool the battery cell 5 until the temperature of the battery cell 5 is reduced to below 45 ℃;
s5, the dew point testing component 81 tests the dew point inside the vacuum containing part 3, the dew point monitoring component 82 transmits a dew point signal to the controller 4, the controller 4 judges whether the dew point detection is qualified, the vacuum containing part 3 with qualified dew point is conveyed to the next process through the qualified conveyor belt 94, and the vacuum containing part 3 with unqualified dew point returns to the feeding conveyor belt 91 through the unqualified conveyor belt 95 to be baked again.
By using the baking and cooling equipment, the baking time is shortened to be within 2 hours from twelve hours, and the power consumption is 80 percent of the original power consumption. The cooling process after the battery cell 5 is baked and baked is combined into a whole, a transfer flow is not needed, the transfer time of the battery cell 5 is reduced, and the production efficiency of the battery cell 5 is improved.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The baking and cooling equipment for the lithium ion battery cell is characterized by comprising a baking system and a cooling system,
the baking system comprises:
a plurality of sets of induction coils for generating an alternating magnetic field;
a power supply electrically connected to the induction coil;
the vacuum accommodating part is used for accommodating a lithium ion battery cell and is arranged in the alternating magnetic field;
the cooling system comprises a cold air input assembly connected with the vacuum accommodating part.
2. The baking and cooling equipment for the lithium ion battery cell according to claim 1, wherein the vacuum accommodating part comprises a sealable tray or a sealable fixture which can accommodate at least one lithium ion battery cell, the inner wall of the vacuum accommodating part is provided with a plurality of grooves, and the vacuum accommodating part is provided with a cold air inlet.
3. The lithium ion battery cell baking and cooling apparatus of claim 1, wherein the baking system further comprises a baking box and a gas input assembly connected to the baking box, and the plurality of sets of induction coils are accommodated in the baking box.
4. The li-ion cell bake cooling apparatus of claim 3, further comprising a control device, the control device comprising a display and a controller, the controller in signal connection with the power source.
5. The baking and cooling device for the lithium ion battery cell according to claim 4, further comprising a vacuum control system, wherein the vacuum control system comprises a vacuum pumping assembly and a vacuum degree monitoring assembly, the vacuum pumping assembly is connected with the vacuum accommodating part, the vacuum pumping assembly is electrically connected with the controller, and the vacuum degree monitoring assembly is in signal connection with the controller and the display respectively.
6. The li-ion cell bake cooling apparatus of claim 4, further comprising a temperature sensor connected to the vacuum containment, the temperature sensor being in signal connection with the display and the controller, respectively.
7. The lithium ion battery cell baking and cooling device according to claim 4, further comprising a dew point testing system, wherein the dew point testing system comprises a dew point testing component and a dew point monitoring component, the dew point testing component is connected to the vacuum accommodating part, and the dew point monitoring component is in signal connection with the controller and the display respectively.
8. The baking and cooling device for the lithium ion battery cell according to claim 4, further comprising a conveying system in signal connection with the controller, wherein the conveying system comprises a feeding conveying belt, a baking conveying belt, a cooling conveying belt, a qualified conveying belt and an unqualified conveying belt, the feeding conveying belt is sequentially connected with the baking conveying belt and the cooling conveying belt, the cooling conveying belt is respectively connected with the qualified conveying belt and the unqualified conveying belt, and the unqualified conveying belt is connected with the feeding conveying belt.
9. The baking and cooling method for the lithium ion battery cell is characterized by comprising the following operations: enabling a lithium ion cell to pass through an alternating magnetic field generated by an induction coil, vacuumizing the environment where the lithium ion cell is located, and baking the lithium ion cell; and cooling the lithium ion electric core by cold air.
10. The baking and cooling method for the lithium ion battery cell according to claim 9, characterized by comprising the following operations:
1) placing the lithium ion battery cell in a vacuum accommodating part, vacuumizing the vacuum accommodating part through an alternating magnetic field generated by an induction coil by the vacuum accommodating part, and baking the lithium ion battery cell;
2) making the actual values of the temperature and the vacuum degree inside the vacuum containing part approach to the set values;
3) cooling and cooling the lithium ion electric core by introducing cold air after baking, and testing the actual dew point of the lithium ion electric core;
4) and calculating the difference value between the actual dew point and the set dew point, and judging whether the baking and cooling of the lithium ion battery cell are finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011059781.3A CN112197515A (en) | 2020-09-30 | 2020-09-30 | Baking and cooling equipment and baking and cooling method for lithium ion battery cell |
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Cited By (1)
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| CN115592032A (en) * | 2022-10-14 | 2023-01-13 | 楚能新能源股份有限公司（Cn） | Transfer device and naked electric core plastic system |
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