CN114111228A - Lithium battery rapid drying method - Google Patents
Lithium battery rapid drying method Download PDFInfo
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- CN114111228A CN114111228A CN202110677412.9A CN202110677412A CN114111228A CN 114111228 A CN114111228 A CN 114111228A CN 202110677412 A CN202110677412 A CN 202110677412A CN 114111228 A CN114111228 A CN 114111228A
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- drying box
- temperature
- drying
- inert gas
- lithium battery
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- 238000001035 drying Methods 0.000 title claims abstract description 95
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 25
- 239000011261 inert gas Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000004321 preservation Methods 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000002826 coolant Substances 0.000 claims abstract description 6
- 238000007664 blowing Methods 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000001307 helium Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 claims description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000005265 energy consumption Methods 0.000 abstract description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001291 vacuum drying Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a quick drying method for a lithium battery, which comprises the following steps: s1, putting the lithium battery to be dried into a drying box and vacuumizing the drying box; s2, heating the drying box to T1, preserving heat for T1 hours, and vacuumizing the drying box after filling inert gas with the temperature of Ta into the drying box in the heat preservation process; s3, heating the drying oven again to T2, preserving the heat for T2 hours, and vacuumizing the drying oven after filling Tb inert gas into the drying oven in the heat preservation process; s4, continuing heating the drying box to T3, preserving the heat for T3 hours, and vacuumizing the drying place after filling the inert gas with the temperature of Tc in the heat preservation process; and S5, filling a cooling medium into the drying box, and rapidly cooling. The invention reduces the energy consumption in the baking process, shortens the baking time, improves the baking efficiency, improves the production efficiency and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium battery rapid drying method.
Background
At present, the baking time of the lithium ion battery in the production process is long, and the method always belongs to the bottleneck process of the lithium ion battery production. The conventional common baking process is that a lithium battery to be baked is placed in a single baking oven, the baking oven is continuously heated, and when a certain temperature is reached, heat preservation is started; during the heat preservation process, the inert gas is filled into the box to remove the moisture generated in the box through vacuum pumping, however, the operation can pump away a large amount of heat, the temperature needs to be raised again, the time is prolonged for baking, the drying result of the lithium ion battery is achieved, a large amount of energy consumption and time cost need to be consumed, a new comprehensive baking method needs to be found, the energy consumption in the baking process is reduced, the production time is shortened, the production efficiency is improved, and the production cost is reduced.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a lithium battery rapid drying method, which reduces energy consumption in a baking process, shortens baking time, improves baking efficiency, improves production efficiency and reduces production cost.
The invention provides a lithium battery rapid drying method, which comprises the following steps:
s1, putting the lithium battery to be dried into a drying box and vacuumizing the drying box;
s2, heating the drying box to T1Keeping temperature t1In the heat preservation process, charging the drying box with the charging temperature of TaThen carrying out vacuum pumping treatment on the inert gas;
s3, heating the drying box again to T2Keeping temperature t2In the heat preservation process, the drying box is filled with water at the temperature TbThen carrying out vacuum pumping treatment on the inert gas;
s4, continuing heating the drying box to T3Keeping temperature t3H, in the heat preservation process, charging the drying part with the charging temperature TcThen carrying out vacuum pumping treatment on the inert gas;
s5, filling a cooling medium into the drying box, and rapidly cooling;
wherein, T1<<T2<T3，Ta、Tb、TcAre all greater than T1。
Preferably, in step S1, after the lithium battery is placed in the drying oven, the normal temperature inert gas is filled into the drying oven for 2-4min, then the air is blown into the drying oven for 4-6min, and then the drying oven is vacuumized until the vacuum degree is-0.09 KPa to-0.1 KPa.
Preferably, in step S2, the drying box is heated from normal temperature to T at a heating rate of 3-5 ℃/min1Charging the drying box with a charging temperature T every 2h in the heat preservation processaBlowing air to the drying box for 4-6min after 2-4min of inert gas, and vacuumizing until the vacuum degree of the drying box is-0.09 to-0.1 KPa.
Preferably, in step S2, T1At a temperature of 40 ℃ to 50 ℃ t1Is 5 to 8 hours, TaIs 55-65 ℃.
Preferably, in step S3, the drying box is heated from T at a heating rate of 1-3 deg.C/min1Rise to T2Charging the drying box with a charging temperature T every 1h in the heat preservation processbBlowing air to the drying box for 4-6min after 2-4min of the inert gas, and vacuumizing until the vacuum degree of the drying box is-0.09 to-0.1 KPa.
Preferably, in step S3, T2At 85-95 ℃ t2Is 10-15 h, TbIs 55-65 ℃.
Preferably, in step S4, the drying box is heated from T at a heating rate of 0.5-1 ℃/min2Rise to T3Charging the drying box with a charging temperature T every 0.5h in the heat preservation processbBlowing air to the drying box for 4-6min after 2-4min of the inert gas, and vacuumizing until the vacuum degree of the drying box is-0.09 to-0.1 KPa.
Preferably, in step S4, T3At a temperature of 105 ℃ to 115 ℃ t31 to 3 hours, TcIs 55-65 ℃.
Preferably, in step S1, the inert gas is one or two of nitrogen, helium and argon.
Preferably, in step S5, the cooling medium is an inert gas at a temperature of-5 ℃ to 5 ℃, and the inert gas is one or two of nitrogen, helium and argon; in the cooling process, filling inert gas with the temperature of minus 5-5 ℃ into the drying box every 1 hour for 2-4min, blowing air into the drying box for 9-11min, and vacuumizing until the vacuum degree of the drying box is minus 0.09-minus 0.1 KPa; until the oven cooled to room temperature.
According to the lithium battery rapid drying method provided by the invention, in the initial stage of baking, gas replacement is carried out by filling normal-temperature inert gas, so that bubbles generated in a gap between a pole piece and a diaphragm in a battery cell are eliminated, and the pole piece and the diaphragm are favorably attached. In the invention, in the baking stage, the stepped heating stage type heat preservation is adopted, and in the preheating heat preservation stage, the battery cell is kept at a certain temperature, so that the binder SBR of the negative pole piece is prevented from rising too fast along with the surface temperature of the pole piece, and the binder migration phenomenon that the content of the SBR is lower than that of the pole piece in the copper foil area is avoided. In the baking stage, the stepped heating stage type heat preservation is adopted, and the high-temperature baking heat preservation stages in different time periods are adopted, so that the baking efficiency can be greatly improved, and the baking effect is improved. The short-time ultrahigh-temperature baking heat preservation stage does not cause the thermal shrinkage phenomenon of the diaphragm caused by long-time baking. In the baking stage, the high-temperature inert gas is filled, so that the moisture in the baking oven can be effectively removed, the heat in the baking oven is prevented from being lost due to the filling of the normal-temperature inert gas, the baking time is effectively prevented from being prolonged, the baking efficiency is improved, the energy consumption is reduced, and the production cost is reduced. In the rapid cooling stage, the battery core is rapidly cooled by filling the cooling medium into the drying box, so that the production time generated by natural cooling is reduced, and the production efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of step-type temperature rise in a lithium battery rapid drying method provided by the present invention.
Detailed Description
Example 1
A method for rapidly drying a lithium ion battery comprises the following steps:
s1, placing the lithium ion battery in a vacuum drying box, vacuumizing until the vacuum degree of the vacuum drying box is-0.09 to-0.1 KPa, then filling normal-temperature inert gas for 3min, blowing for 5min, and finally vacuumizing until the vacuum degree of the vacuum drying box is-0.09 to-0.1 KPa;
s2, preheating and baking: raising the temperature of the oven from 25 +/-3 ℃ at normal temperature to 45 +/-5 ℃ at the heating rate of 3 ℃/min, and keeping the temperature for 5 hours, as shown in the preheating baking stage of figure 1; and in the heat preservation stage, filling high-temperature inert gas every 2 hours, and vacuumizing once until the vacuum degree of the drying oven is-0.09 to-0.1 KPa.
S3, high-temperature baking stage: heating the baking temperature from 45 + -5 deg.C to 90 + -5 deg.C at a heating rate of 1 deg.C/min, and maintaining for 10 hr, as shown in the high-temperature baking stage of FIG. 1; and in the heat preservation stage, high-temperature inert gas is filled every 1h, and the vacuum degree is pumped once until the vacuum degree of the drying box is-0.09 to-0.1 KPa.
S4, ultra-high temperature baking stage: heating the baking temperature from 90 + -5 deg.C to 110 + -5 deg.C at a heating rate of 0.5 deg.C/min, and maintaining for 1h, as shown in the ultra-high temperature baking stage of FIG. 1; and in the heat preservation stage, high-temperature inert gas is filled every 0.5h, and the vacuum is pumped once until the vacuum degree of the drying box is-0.09 to-0.1 KPa.
S5, cooling: filling low-temperature inert gas for 3min, blowing for 10min, vacuumizing until the vacuum degree of a drying box is-0.09 to-0.1 KPa, and performing rapid cooling treatment on the battery in a breathing type vacuumizing mode every 1 h.
Example 2
The difference from example 1 is:
in step S2, the preheating and baking stage: the heating rate is modified to 5 ℃/min, and the heat preservation time is modified to 8 h;
in step S3, a high-temperature baking stage: the heating rate is modified to 3 ℃/min, and the heat preservation time is modified to 15 h;
in step S4, the ultra-high temperature baking stage: the heating rate is modified to 1 ℃/min, and the heat preservation time is modified to 3 h;
the other steps are the same as in example 1.
Comparative examples
Unlike examples 1 and 2, the comparative example employs a conventional baking process, and the steps are as follows:
1) putting the lithium ion battery into a vacuum drying box, vacuumizing until the vacuum degree of the vacuum drying box is-0.09 to-0.1 KPa,
2) setting an oven baking process, wherein the specific baking system is as follows:
A. heating the temperature of the oven from room temperature to 90 +/-5 ℃ at the heating rate of 1 ℃/min, and keeping the vacuum degree of the drying oven at-0.09 to-0.1 KPa;
B. filling inert gas at room temperature for 5min every 2h, and blowing for 20 min;
C. repeating the step b.24 times, stopping heating, and controlling the vacuum degree of the drying box to be-0.09 to-0.1 KPa;
3) and naturally cooling the drying box to room temperature.
Testing the moisture of the pole piece: after the cells of the same batch are baked in the embodiments 1 and 2 and the comparative example, the test results of the moisture of the disassembled pole piece are shown in the following table:
as can be seen from examples 1 and 2 and comparative example, the baking method of the present invention has the advantages of obviously superior time, short drying time, and obviously superior baking effect of examples 1 and 2 compared with comparative example in view of moisture test result.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (10)
1. A lithium battery rapid drying method is characterized by comprising the following steps:
s1, putting the lithium battery to be dried into a drying box and vacuumizing the drying box;
s2, heating the drying box to T1Keeping temperature t1In the heat preservation process, charging the drying box with the charging temperature of TaThen carrying out vacuum pumping treatment on the inert gas;
s3, heating the drying box again to T2Keeping temperature t2In the heat preservation process, charging the drying box with the charging temperature of TbThen carrying out vacuum pumping treatment on the inert gas;
s4, continuing heating the drying box to T3Keeping temperature t3H, in the heat preservation process, charging the dry place with the charging temperature TcThen carrying out vacuum pumping treatment on the inert gas;
s5, filling a cooling medium into the drying box, and rapidly cooling;
wherein, T1<<T2<T3，Ta、Tb、TcAre all greater than T1。
2. The lithium battery rapid drying method of claim 1, wherein in step S1, after the lithium battery is placed in the drying oven, the drying oven is filled with normal temperature inert gas for 2-4min, then air is blown into the drying oven for 4-6min, and then the drying oven is vacuumized until the vacuum degree is-0.09 KPa to-0.1 KPa.
3. The lithium battery rapid drying method as claimed in claim 1, wherein in step S2, the drying oven is raised from room temperature to T at a temperature raising rate of 3-5 ℃/min1Charging the drying box with a charging temperature T every 2h in the heat preservation processaBlowing air to the drying box for 4-6min after 2-4min of inert gas, and vacuumizing until the vacuum degree of the drying box is-0.09 to-0.1 KPa.
4. According to the rightThe lithium battery rapid drying method of claim 3, wherein in step S2, T1At a temperature of 40 ℃ to 50 ℃ t1Is 5 to 8 hours, TaIs 55-65 ℃.
5. The lithium battery rapid drying method as claimed in any one of claims 1 to 4, wherein the drying oven is driven from T at a temperature rising rate of 1-3 ℃/min in step S31Rise to T2Charging the drying box with a charging temperature T every 1h in the heat preservation processbBlowing air to the drying box for 4-6min after 2-4min of the inert gas, and vacuumizing until the vacuum degree of the drying box is-0.09 to-0.1 KPa.
6. The lithium battery rapid drying method of claim 5, wherein in step S3, T is2At 85-95 ℃ t2Is 10-15 h, TbIs 55-65 ℃.
7. The lithium battery rapid drying method according to any one of claims 1 to 4, wherein in step S4, the drying oven is driven from T at a heating rate of 0.5-1 ℃/min2Rise to T3Charging the drying box with a charging temperature T every 0.5h in the heat preservation processbBlowing air to the drying box for 4-6min after 2-4min of the inert gas, and vacuumizing until the vacuum degree of the drying box is-0.09 to-0.1 KPa.
8. The lithium battery rapid drying method of claim 7, wherein in step S4, T is3At a temperature of 105 ℃ to 115 ℃ t31 to 3 hours, TcIs 55-65 ℃.
9. The lithium battery rapid drying method according to any one of claims 1 to 4, wherein in step S1, the inert gas is one or two of nitrogen, helium and argon.
10. The lithium battery rapid drying method according to any one of claims 1 to 4, wherein in step S5, the cooling medium is an inert gas at a temperature of-5 ℃ to 5 ℃, and the inert gas is one or two of nitrogen, helium and argon; in the cooling process, filling inert gas with the temperature of minus 5-5 ℃ into the drying box every 1 hour for 2-4min, blowing air into the drying box for 9-11min, and vacuumizing until the vacuum degree of the drying box is minus 0.09-minus 0.1 KPa; until the oven cooled to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110677412.9A CN114111228A (en) | 2021-06-16 | 2021-06-16 | Lithium battery rapid drying method |
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| CN202110677412.9A CN114111228A (en) | 2021-06-16 | 2021-06-16 | Lithium battery rapid drying method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115143735A (en) * | 2022-06-29 | 2022-10-04 | 厦门海辰新能源科技有限公司 | Rapid preheating and drying method, production process of lithium ion battery and lithium ion battery |
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Application publication date: 20220301 |