CN116753682A - Lithium ion battery medium baking method - Google Patents

Lithium ion battery medium baking method Download PDF

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Publication number
CN116753682A
CN116753682A CN202310734293.5A CN202310734293A CN116753682A CN 116753682 A CN116753682 A CN 116753682A CN 202310734293 A CN202310734293 A CN 202310734293A CN 116753682 A CN116753682 A CN 116753682A
Authority
CN
China
Prior art keywords
medium
battery
lithium ion
ion battery
baking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310734293.5A
Other languages
Chinese (zh)
Inventor
吴吉强
龙波
王凯
刁胜
曾坚义
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guizhou Jiaying Technology Co ltd
Original Assignee
Guizhou Jiaying Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guizhou Jiaying Technology Co ltd filed Critical Guizhou Jiaying Technology Co ltd
Priority to CN202310734293.5A priority Critical patent/CN116753682A/en
Publication of CN116753682A publication Critical patent/CN116753682A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • 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
    • 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
    • F26B25/06—Chambers, containers, or receptacles
    • F26B25/14—Chambers, containers, receptacles of simple construction
    • F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/22—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration
    • 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
    • F26B5/044—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 for drying materials in a batch operation in an enclosure having a plurality of shelves which may be heated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Molecular Biology (AREA)
  • Microbiology (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The application discloses a baking method for a lithium ion battery medium, which comprises the following steps: the constant temperature oven using lithium ion battery medium makes the battery medium in vacuum and high temperature environment to perform stable constant temperature heating baking process. The vacuum module is used for pumping air from the inside of the box body to establish vacuum degree, the pump body circulates liquid medium in the medium channel through the medium outlet pipe and the medium inlet pipe, the constant temperature heating at 75-95 ℃ is kept for baking the battery medium 36h of the battery in the rectangular groove, heat is released from four sides of the rectangular groove and collected to the upper part of the middle part of the battery to form a temperature keeping area for stable constant temperature heating of the periphery of the outside of the battery, the heating effect of the medium in the battery is improved, and the problem that the heat conducting plate dissipates heat to the bottom surface of the battery only through the top surface can not form the temperature keeping area for heating is solved.

Description

Lithium ion battery medium baking method
Technical Field
The application relates to a baking method for a lithium ion battery medium, and belongs to the technical field of battery baking processes.
Background
In order to bake and evaporate moisture in the pores of the battery medium, concentrated baking of the unpackaged battery is required. Traditional gas heating toasts, need blow the battery heating medium back discharge realization circulation toasts with air follow external environment extraction heating, often need with external cold air heating when heating air, leads to the required energy of heating more.
The existing liquid internal circulation heating and baking method can realize secondary heating circulation of the medium with temperature after circulation, thereby reducing energy consumption. The prior liquid internal circulation heating baking is air energy heat pump heating type battery vacuum baking equipment with the prior Chinese patent publication number of CN218764296U, and the technical content is as follows: the heated medium circulates in the heat conducting plate under the communication of the heat pump medium inlet pipeline flow and the heat pump medium outlet pipeline and the heat conducting metal pipe, so that the batteries placed on the top of the heat conducting plate are uniformly contacted and conducted with heat; although the internal circulation of the heated fluid can transfer heat to the top of the heat conducting plate to heat the medium inside the battery, the heat conducting plate only dissipates heat to the bottom surface of the battery through the top surface when dissipating heat, and the problem that the temperature maintaining area can not be formed around the outside of the battery for heating is solved, so that the heating effect on the medium inside the battery is poor.
Disclosure of Invention
In order to solve the technical problems, the application provides a baking method for a lithium ion battery medium.
The application is realized by the following technical scheme.
The application provides a baking method for a lithium ion battery medium, which comprises the following steps: the constant temperature oven using lithium ion battery medium makes the battery medium in vacuum and high temperature environment to perform stable constant temperature heating baking process.
The high-temperature environment is subjected to stable constant-temperature heating, namely, the battery medium of the battery in the rectangular groove is kept to be heated and baked at the constant temperature of 75-95 ℃ for 36 hours; the vacuum degree of the vacuum is-85 Mpa.
The constant temperature oven of lithium ion battery medium includes:
the box body is hollow and provided with an accommodating space;
the cell body, the cell body has the indent space, the rectangular groove of rectangle is installed in the airtight installation in indent space, the outside indent space in rectangular groove forms the medium passageway that the medium flows, the airtight installation apron in cell body top, the apron covers indent space opening and rectangular groove topside, makes the battery can put the rectangular inslot portion, when the battery is placed in the rectangular inslot portion of rectangle, four sides in rectangular groove of rectangle can carry out heat exchange with heating medium and release heat.
The front opening of the box body is provided with a box door for covering the box body.
The groove bodies are arranged in the hollow accommodating space of the box body at intervals.
The top of the box body is provided with a vent, a rotatable vacuum module is arranged in the vent, and the vacuum module is positioned above the middle part of the rectangular groove.
The opposite sides of the two sides of the tank body of the medium channel are communicated with a medium inlet pipe for introducing medium and a medium outlet pipe for discharging medium, and heated liquid medium enters the concave space inside the tank body from the medium inlet pipe to form the medium channel.
The medium outlet pipe is communicated with the medium inlet pipe through a circulating pipe.
The circulating pipe is provided with a heater for heating the liquid medium.
The circulating pipe is provided with a pump body for providing circulating power for the liquid medium; the pump body is arranged on the circulating pipe at the front side of the heater.
The application has the beneficial effects that: the vacuum module is used for pumping air from the inside of the box body to establish vacuum degree, the pump body circulates liquid medium in the medium channel through the medium outlet pipe and the medium inlet pipe, the constant temperature heating at 75-95 ℃ is kept for baking the battery medium 36h of the battery in the rectangular groove, heat is released from four sides of the rectangular groove and collected to the upper part of the middle part of the battery to form a temperature keeping area for stable constant temperature heating of the periphery of the outside of the battery, the heating effect of the medium in the battery is improved, and the problem that the heat conducting plate dissipates heat to the bottom surface of the battery only through the top surface can not form the temperature keeping area for heating is solved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present application;
FIG. 2 is a schematic view of the structure of the tank body of the present application;
FIG. 3 is a schematic illustration of the cell with no shrinkage of the surface separator after baking;
FIG. 4 is a schematic illustration of a slight shrinkage of the separator on the surface after baking of the cell;
FIG. 5 is a schematic illustration of the severe shrinkage of the separator on the surface after baking of the cell;
in the figure: 1-a box body; 11-door; 12-a vacuum module; 2-a groove body; 21-a concave space; 22-rectangular grooves; 23-media channels; 24-cover plate; 31-medium inlet pipe; 32-medium outlet pipe; 33-circulation pipe; 4-a heater; 5-battery; 6-pump body.
Detailed Description
The technical solution of the present application is further described below, but the scope of the claimed application is not limited to the above.
As shown in fig. 1 to 3.
The application relates to a constant temperature oven for a lithium ion battery medium, which comprises the following components:
a box body 1 for providing a hollow accommodating space, wherein a box door 11 for covering and sealing the box body 1 is arranged on the front side opening of the box body 1;
the box body 1 is internally provided with a plurality of groove bodies 2 which are distributed at intervals in a hollow accommodating space, the groove bodies 2 are provided with concave spaces 21, rectangular grooves 22 are hermetically arranged in the concave spaces 21, medium channels 23 for medium flow are formed in the concave spaces 21 outside the rectangular grooves 22, a cover plate 24 is hermetically arranged at the top of the groove bodies 2, the cover plate 24 covers the openings of the concave spaces 21 and the top edges of the rectangular grooves 22, so that the batteries 5 can be placed in the rectangular grooves 22, and when the batteries 5 are placed in the rectangular grooves 22, the four sides of the rectangular grooves 22 can exchange heat with a heating medium to release heat.
After the four sides of the rectangular groove 22 release heat, the heat discharge way is that most heat is released and collected from the four sides of the rectangular groove 22 to the upper part of the middle part of the battery 5 to form a temperature maintaining area to heat the periphery outside the battery 5 at a stable constant temperature, so that the medium heating effect inside the battery 5 is improved, and the problem that the heat conducting plate can not form the temperature maintaining area to heat when radiating only through the top surface to the bottom surface of the battery is solved.
The top of the box body 1 is provided with a vacuum module 12 for constructing a vacuum environment inside the box body 1, the vacuum module 12 can adopt a vacuum pump, and the vacuum module 12 is positioned above the middle part of the rectangular groove 22.
The medium inlet pipe 31 for introducing medium and the medium outlet pipe 32 for discharging medium are communicated with the opposite sides of the tank body 2 positioned in the medium channel 23, the heated liquid medium enters the concave space 21 inside the tank body 2 from the medium inlet pipe 31 to form the medium channel 23, and the heat in the high-temperature liquid medium exchanges heat from the four sides of the rectangular tank 22 to release heat for heating the periphery outside the battery 5, so that the medium inside the battery 5 is heated; the liquid medium with a certain temperature reduced is discharged from the medium outlet pipe 32 for secondary heating, the secondary heated liquid medium can be heated by a small amount of energy and then is conveyed into the medium channel 23 again to achieve the constant temperature heating effect of constant temperature for heating the medium in the battery 5, and the liquid medium is composed of engine oil and the like.
The medium outlet pipe 32 is communicated with the medium inlet pipe 31 through a circulating pipe 33, and the circulating pipe 33 is provided with a heater 4 for heating the liquid medium and a pump body 6 for providing circulating power for the liquid medium. The pump body 6 is arranged on the circulating pipe 33 at the front side of the heater 4, so that the liquid medium is firstly circulated and then heated, and the damage to the pump body 6 is reduced.
A baking method for lithium ion battery medium comprises the following steps: the constant temperature oven using lithium ion battery medium makes the battery medium in vacuum and high temperature environment to perform stable constant temperature heating baking process.
The specific baking process includes the following examples.
In embodiment 1, the heater 4 heats the liquid medium, which is conveyed into the medium channel 23 through the pump body 6 to exchange heat with the four walls of the rectangular groove 22, after the temperature reaches 75 ℃, the vacuum module 12 pumps the inside of the box body 1 to establish a vacuum environment with the vacuum degree of-85 Mpa, the pump body 6 circulates the liquid medium in the medium channel 23 through the medium outlet pipe 32 and the medium inlet pipe 31, and the battery medium 36h of the battery 5 in the rectangular groove 22 is heated and baked at the constant temperature of 75 ℃.
In embodiment 2, the heater 4 heats the liquid medium, which is conveyed into the medium channel 23 through the pump body 6 to exchange heat with the four walls of the rectangular groove 22, and after the temperature reaches 75 ℃, the vacuum module 12 pumps the inside of the box body 1 to establish a vacuum environment with the vacuum degree of-85 Mpa, the pump body 6 circulates the liquid medium in the medium channel 23 through the medium outlet pipe 32 and the medium inlet pipe 31, and the battery medium 36h of the battery 5 in the rectangular groove 22 is heated and baked at the constant temperature of 80 ℃.
In embodiment 3, the heater 4 heats the liquid medium, which is conveyed into the medium channel 23 through the pump body 6 to exchange heat with the four walls of the rectangular groove 22, and after the temperature reaches 75 ℃, the vacuum module 12 pumps the inside of the box body 1 to establish a vacuum environment with the vacuum degree of-85 Mpa, the pump body 6 circulates the liquid medium in the medium channel 23 through the medium outlet pipe 32 and the medium inlet pipe 31, and the battery medium 36h of the battery 5 in the rectangular groove 22 is heated and baked at the constant temperature of 85 ℃.
In example 4, the heater 4 heats the liquid medium, which is conveyed into the medium channel 23 through the pump body 6 to exchange heat with the four walls of the rectangular groove 22, and after the temperature reaches 75 ℃, the vacuum module 12 pumps the inside of the box body 1 to establish a vacuum environment with the vacuum degree of-85 Mpa, the pump body 6 circulates the liquid medium in the medium channel 23 through the medium outlet pipe 32 and the medium inlet pipe 31, and the battery medium 36h of the battery 5 in the rectangular groove 22 is heated and baked at the constant temperature of 90 ℃.
In example 5, the heater 4 heats the liquid medium, which is conveyed into the medium channel 23 through the pump body 6 to exchange heat with the four walls of the rectangular groove 22, and after the temperature reaches 75 ℃, the vacuum module 12 pumps the inside of the box body 1 to establish a vacuum environment with the vacuum degree of-85 Mpa, the pump body 6 circulates the liquid medium in the medium channel 23 through the medium outlet pipe 32 and the medium inlet pipe 31, and the battery medium 36h of the battery 5 in the rectangular groove 22 is heated and baked at the constant temperature of 100 ℃.
In example 6, the heater 4 heats the liquid medium, which is conveyed into the medium channel 23 through the pump body 6 to exchange heat with the four walls of the rectangular groove 22, after the temperature reaches 75 ℃, the vacuum module 12 pumps the inside of the box body 1 to establish a vacuum environment with the vacuum degree of-85 Mpa, the pump body 6 circulates the liquid medium in the medium channel 23 through the medium outlet pipe 32 and the medium inlet pipe 31, and the battery medium 36h of the battery 5 in the rectangular groove 22 is heated and baked at the constant temperature of 105 ℃.
In example 7, the heater 4 heats the liquid medium, which is conveyed into the medium channel 23 through the pump body 6 to exchange heat with the walls of the rectangular groove 22, and after the temperature reaches 75 ℃, the vacuum module 12 pumps the inside of the box body 1 to establish a vacuum environment with the vacuum degree of-85 Mpa, the pump body 6 circulates the liquid medium in the medium channel 23 through the medium outlet pipe 32 and the medium inlet pipe 31, and the battery medium 36h of the battery 5 in the rectangular groove 22 is heated and baked at the constant temperature of 110 ℃.
The moisture content and the diaphragm conditions of the positive and negative plates after baking the seven examples of battery media are shown in table 1:
table 1 positive and negative electrode sheet moisture content and diaphragm condition table corresponding to baking temperature of battery medium
The condition that the surface membrane does not shrink after baking the battery 5 is shown in fig. 3, the condition that the surface membrane slightly shrinks after baking the battery 5 is shown in fig. 4, and the condition that the surface membrane severely shrinks after baking the battery 5 is shown in fig. 5.
As can be seen from fig. 3 to 5, the constant temperature oven based on lithium ion battery medium of the present application heats and toasts battery medium at constant temperature, four sides of the rectangular groove 22 release heat, the vacuum module 12 pumps air from the inside of the box 1 to establish a vacuum environment with a vacuum degree of-85 Mpa, the pump body 6 circulates the liquid medium in the medium channel 23 through the medium outlet pipe 32 and the medium inlet pipe 31, the constant temperature heating and toasting of the battery medium 36h of the battery 5 in the rectangular groove 22 is maintained at 75-95 ℃, the heat is released and collected from the four sides of the rectangular groove 22 to the upper part of the middle part of the battery 5 to form a temperature maintaining area for stable constant temperature heating of the periphery of the outside of the battery 5, the heating effect of the medium inside of the battery 5 is improved, and the problem that the heat conducting plate dissipates heat only through the top surface to the bottom surface of the battery can not form the temperature maintaining area for heating is solved.

Claims (10)

1. The baking method for the lithium ion battery medium is characterized by comprising the following steps of: and the constant-temperature oven battery medium using the lithium ion battery medium is subjected to a baking process of stable constant-temperature heating in a vacuum and high-temperature environment.
2. The method for baking lithium ion battery media according to claim 1, wherein: the high-temperature environment is stably and constantly heated, and the battery medium of the battery (5) in the rectangular groove (22) is heated and baked at the constant temperature of 75-95 ℃ for 36h; the vacuum degree of the vacuum is-85 Mpa.
3. The method of baking a lithium ion battery medium according to claim 1, wherein the constant temperature oven for a lithium ion battery medium comprises:
the box body (1), the cavity of the box body (1) has accommodation space;
the battery pack comprises a tank body (2), wherein the tank body (2) is provided with a concave space (21), a rectangular groove (22) is arranged in the concave space (21) in a sealing mode, a medium channel (23) for medium flow is formed in the concave space (21) outside the rectangular groove (22), a cover plate (24) is arranged on the top of the tank body (2) in a sealing mode, the cover plate (24) covers the opening of the concave space (21) and the top edge of the rectangular groove (22), the battery (5) can be placed inside the rectangular groove (22), and when the battery (5) is placed inside the rectangular groove (22), heat can be released through heat exchange between four sides of the rectangular groove (22) and a heating medium.
4. The method for baking lithium ion battery media according to claim 3, wherein: the front opening of the box body (1) is provided with a box door (11) for covering and closing the box body (1).
5. The method for baking lithium ion battery media according to claim 3, wherein: the plurality of groove bodies (2) are arranged in the hollow accommodating space of the box body (1) at intervals.
6. The method for baking lithium ion battery media according to claim 3, wherein: the top of the box body (1) is provided with a ventilation opening, a rotatable vacuum module (12) is arranged in the ventilation opening, and the vacuum module (12) is positioned above the middle part of the rectangular groove (22).
7. The method for baking lithium ion battery media according to claim 3, wherein: the medium inlet pipe (31) for introducing the medium and the medium outlet pipe (32) for discharging the medium are communicated with the opposite sides of the groove body (2) positioned in the medium channel (23), and the heated liquid medium enters the concave space (21) in the groove body (2) from the medium inlet pipe (31) to form the medium channel (23).
8. The method for baking lithium ion battery media according to claim 7, wherein: the medium outlet pipe (32) is communicated with the medium inlet pipe (31) through a circulating pipe (33).
9. The method for baking lithium ion battery media according to claim 8, wherein: the circulating pipe (33) is provided with a heater (4) for heating the liquid medium.
10. The method for baking lithium ion battery media according to claim 9, wherein: the circulating pipe (33) is provided with a pump body (6) for providing circulating power for the liquid medium; the pump body (6) is arranged on a circulating pipe (33) at the front side of the heater (4).
CN202310734293.5A 2023-06-20 2023-06-20 Lithium ion battery medium baking method Pending CN116753682A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310734293.5A CN116753682A (en) 2023-06-20 2023-06-20 Lithium ion battery medium baking method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310734293.5A CN116753682A (en) 2023-06-20 2023-06-20 Lithium ion battery medium baking method

Publications (1)

Publication Number Publication Date
CN116753682A true CN116753682A (en) 2023-09-15

Family

ID=87951058

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310734293.5A Pending CN116753682A (en) 2023-06-20 2023-06-20 Lithium ion battery medium baking method

Country Status (1)

Country Link
CN (1) CN116753682A (en)

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