CN109373707B - Baking method for reducing water content of battery core of flexible package lithium battery - Google Patents
Baking method for reducing water content of battery core of flexible package lithium battery Download PDFInfo
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- CN109373707B CN109373707B CN201811134872.1A CN201811134872A CN109373707B CN 109373707 B CN109373707 B CN 109373707B CN 201811134872 A CN201811134872 A CN 201811134872A CN 109373707 B CN109373707 B CN 109373707B
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- 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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- 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
- F26B23/06—Heating arrangements using electric heating resistance 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
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
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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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- 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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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Battery Electrode And Active Subsutance (AREA)
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Abstract
A baking method for reducing the water content of a flexible package lithium battery cell comprises the following steps: placing the battery core into a contact type clamp, and positioning and clamping; the clamp and the battery cell are sent into an oven, and the oven is vacuumized to be less than 50 Pa; introducing dry gas into the oven; electrifying the clamp and heating to 80-85 ℃; loosening the clamp until the clamping force of the clamp is 20N, vacuumizing to less than 50Pa again, keeping the temperature of the clamp at 80-85 ℃ in a vacuum state, and baking the battery cell for 150 min; stopping heating after the baking time is reached, introducing dry gas into the baking oven, and taking out the battery core; and (5) sending the battery cell into cooling equipment, cooling and finishing battery cell baking. The invention adopts the contact type fixture heating plate to clamp the electric core for heating and heat preservation, quickly gasifies and overflows the moisture in the electric core electrode plate under the constant temperature and vacuum state, and has short baking time and high moisture removal efficiency.
Description
Technical Field
The invention relates to a baking method for reducing the water content of a battery core of a flexible package lithium battery, belonging to the technical field of lithium battery preparation.
Background
With the gradual increase of the competition of the new energy electric automobile industry, the market competition of the power type lithium ion battery is also becoming white and hot at present, and the soft package lithium ion battery as one of the mainstream technical route products also gradually enters the stage with the repeated performance cost from the stage of simply comparing the performance.
In the production process of the lithium battery, the baking of the battery core is very importantThe purpose of the step (2) is to remove moisture existing in the battery cell, particularly on the pole piece, and to prevent potential safety hazards. There are many factors that affect the performance of lithium batteries, such as material types, positive and negative electrode compacted densities, moisture, coating surface density, electrolyte usage, etc., wherein the water content has a crucial influence on the performance of lithium batteries, and is a key factor that needs to be strictly controlled in the production process of lithium batteries. The first charge-discharge capacity, internal resistance, battery cycle life and battery volume of the lithium battery all have important relations with the water content. Excessive moisture can cause the decomposition of lithium salt in the electrolyte, and meanwhile, the electrolyte has certain corrosion damage effects on the anode and cathode materials and the current collector. Moreover, when the water content is excessive, the excess water continues to react with the LiPF6The reaction generates HF gas, causing swelling, resulting in a decrease in cycle performance and safety performance of the battery. Therefore, the moisture inside the battery is strictly controlled in the production process of the lithium battery.
The current general battery core baking process is to heat to 80 ℃ and dry for 24-36 hours by using an oven baking mode radiation and an air convection mode, and replace nitrogen once every 2-3 hours. The existing process has low production efficiency and high production kinetic energy cost, and the risk of battery performance reduction caused by diaphragm shrinkage, porosity reduction and the like can exist due to long baking time.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a baking method for reducing the water content of a battery core of a flexible package lithium battery.
The technical problem of the invention is solved by the following technical scheme:
a baking method for reducing the water content of a flexible package lithium battery cell comprises the following steps:
a. placing the battery core into a contact type clamp, and positioning and clamping with the clamping force of 100N;
b. the clamp and the battery cell are sent into an oven, and the vacuum pumping is carried out until the pressure is less than 50Pa, and the vacuum pumping time is less than or equal to 5 min;
c. introducing dry gas into the oven for less than or equal to 3 min;
d. the clamp is electrified and heated to 80-85 ℃, and the time of electrifying and heating is less than or equal to 40 min;
e. loosening the clamp until the clamping force of the clamp is 20N, vacuumizing again to less than 50Pa, vacuumizing for less than or equal to 5min, keeping the temperature of the clamp at 80-85 ℃ in a vacuum state, baking the battery cell for 120-150min, and vacuumizing once every 40-50min in the baking process, wherein the vacuumizing time is less than or equal to 2min each time;
f. stopping heating after the baking time is reached, introducing dry gas into the oven for less than or equal to 5min, and taking out the battery core;
g. and (3) sending the battery cell into cooling equipment, cooling the battery cell for 30 +/-5 min to ensure that the temperature of the battery cell is cooled to 45-55 ℃, and finishing baking the battery cell.
In the baking method for reducing the water content of the battery core of the flexible package lithium battery, in the steps a-d, the clamping force of the clamp is kept constant, and the position of the battery core relative to the clamp is constant in the transfer process of the clamp.
In the baking method for reducing the water content of the flexible package lithium battery cell, in the steps c and f, the introduced dry gas is nitrogen.
In the baking method for reducing the water content of the flexible package lithium battery cell, in the step e, the temperature of the clamp in a vacuum state is 85 ℃, and the baking time is 150 min.
In the baking method for reducing the water content of the battery core of the flexible package lithium battery, in the step g, the battery core is cooled for 30min, and the temperature of the battery core is cooled to 45 ℃.
The baking method for reducing the water content of the battery core of the flexible package lithium battery is characterized in that the steps a to g are all operated when the environmental dew point is less than or equal to minus 30 ℃.
According to the baking method for reducing the water content of the battery cell of the flexible package lithium battery, the contact type clamp comprises a plurality of heating plates, a clamping mechanism, a contact plate and a limiting plate, the number of the heating plates is multiple, the battery cell is arranged between every two adjacent heating plates, each heating plate comprises a metal substrate, a heating sheet and a resistance wire, the resistance wire is arranged inside the heating sheet, and the heating sheet is arranged on the outer layer of the metal substrate; the bottom of the heating sheet is provided with a wiring terminal which is inserted on the contact plate in a contact mode, and the contact plate is provided with a plug which is connected with an external power supply through the plug; the limiting plates are arranged at two ends of the heating plate, and the clamping mechanism clamps the heating plate through the limiting plates.
According to the baking method for reducing the water content of the battery core of the flexible package lithium battery, the top end of the heating plate is provided with the guide blocks, and the battery core is placed between the heating plates along the guide blocks.
According to the invention, the battery cell is heated by adopting the contact-type clamp, so that the temperature of the pole piece in the battery cell can be rapidly raised to the process temperature, and meanwhile, the temperature distribution in the battery cell is more uniform by adopting a contact-type heating mode; the battery cell is heated in a constant-temperature contact manner in a vacuum-pumping environment, and after the temperature is raised to a baking temperature, the clamping mechanism is released, so that the moisture in the battery cell can be fully discharged; the baking method of the invention shortens the baking time of the battery cell to 3-4h, and greatly improves the baking working efficiency of the battery cell of the flexible package lithium ion battery.
Drawings
FIG. 1 is a schematic view of a clamp according to the present invention;
FIG. 2 is a side view of the clamp;
FIG. 3 is a schematic view of a heating plate structure;
fig. 4 is a schematic structural view of the heating sheet.
In the drawings, the reference numerals denote: 1. an electric core; 2. heating plates; 2-1, a metal substrate; 2-2, heating sheets; 2-3, resistance wires; 2-4, a wiring terminal; 2-5, a guide block; 3. a clamping mechanism; 4. a contact plate; 5. and a limiting plate.
Detailed Description
The present invention is further illustrated by the following examples.
Put into dry anchor clamps with lithium cell electricity core and fix to carry out information binding with electric core data and anchor clamps through sweeping electric core bar code and anchor clamps bar code, the back of fixing a position, lithium cell electricity core is at anchor clamps transfer process, and is fixed for the anchor clamps position, must not have the displacement.
Referring to fig. 1-4, the contact type fixture comprises heating plates 2, clamping mechanisms 3, contact plates 4 and limiting plates 5, wherein a plurality of heating plates 2 are arranged, a battery cell 1 is arranged between every two adjacent heating plates 2, each heating plate 2 comprises a metal substrate 2-1, a heating plate 2-2 and a resistance wire 2-3, the resistance wire 2-3 is arranged inside the heating plate 2-2, and the heating plate 2-2 is arranged on the outer layer of the metal substrate 2-1; the bottom of the heating sheet 2-2 is provided with a wiring terminal 2-4 which is inserted on the contact plate 4 in a contact mode, and the contact plate 4 is provided with a plug which is connected with an external power supply through the plug; the limiting plates 5 are arranged at two ends of the heating plate 2, and the clamping mechanism 3 clamps the heating plate 2 through the limiting plates 5. The top end of the heating plate 2 is provided with guide blocks 2-5, and the battery cell 1 is placed between the heating plates 2 along the guide blocks 2-5.
Anchor clamps utilize clamping mechanism 3, will set up the electric core 1 locking location between hot plate 2, and the clamping-force is invariable to be 100N to guarantee that electric core 1 and hot plate 2 are seamless to contact, thereby the switch on back, thereby the piece that generates heat circular telegram generates heat and heats electric core, and guarantees that cell shell does not receive excessive pressure.
The clamp and the battery cell are sent into an oven, and the vacuum pumping is carried out until the pressure is less than 50Pa, and the vacuum pumping time is less than or equal to 5 min; introducing nitrogen into the oven for less than or equal to 3 min; the clamp is electrified and heated to 80-85 ℃, and the time of electrifying and heating is less than or equal to 40 min; loosening the clamp until the clamping force of the clamp is 20N, vacuumizing again to less than 50Pa, vacuumizing for less than or equal to 5min, keeping the temperature of the clamp at 80-85 ℃ in a vacuum state, baking the battery cell for 120-150min, and vacuumizing once every 40-50min in the baking process, wherein the vacuumizing time is less than or equal to 2min each time; stopping heating after the baking time is reached, introducing nitrogen into the oven for 5min, and taking out the battery core; and (3) sending the battery cell into cooling equipment, cooling the battery cell for 30 +/-5 min by using an air cooling system, cooling the temperature of the battery cell to 45-55 ℃, and finishing baking the battery cell.
And detecting the moisture content of the battery cell baked by the baking method, and comparing the moisture content with the moisture content of the conventional baked battery cell, wherein the conventional baking method adopts an oven baking mode of radiation heating or an air convection mode of heating. Referring to table 1, after the cells were baked by the conventional baking method for the a1-a4 samples, moisture content tests were performed on different parts of different cells; the samples B1-B4 are the tests of the moisture content of the battery cell under the conditions of the same baking temperature and different baking time.
Testing conditions of a moisture meter: selecting the furnace temperature of 160 ℃, testing time of 15min, and weighing: 2-3 g; the A sample and the B sample are used for testing the baked positive pole piece of the battery cell, three battery cells are respectively taken for each test, three different positions are taken for the pole piece position on each battery cell, and each group of data in the table is the average value of 9 position tests.
TABLE 1 comparison table of moisture content of baked battery cell of the present invention and moisture content of conventional baked battery cell
| Sample (I) | Baking temperature and time | Sample weight (g) | CW total water volume (ug) | water content (ppm) | Blank average value ug | Drift (ug/min) | Humidity |
| A1 | 85℃-24h | 2.3980 | 801.502 | 265.0 | 103.4 | 3.9 | 30% |
| A2 | 85℃-24h | 2.7101 | 748.368 | 214.9 | 103.4 | 3.9 | 30% |
| A3 | 85℃-24h | 2.4669 | 901.231 | 298.0 | 103.4 | 3.9 | 30% |
| A4 | 85℃-24h | 2.4312 | 742.322 | 237.0 | 103.4 | 3.9 | 30% |
| B1 | 85℃-1h | 2.4758 | 408.951 | 98.1 | 103.4 | 3.9 | 30% |
| B2 | 85℃-2h | 2.6758 | 480.008 | 117.3 | 103.4 | 3.9 | 30% |
| B3 | 85℃-3h | 2.4979 | 472.845 | 122.8 | 103.4 | 3.9 | 30% |
| B4 | 85℃-4h | 2.4724 | 444.262 | 112.5 | 103.4 | 3.9 | 30% |
Referring to table 1, it can be seen through comparative analysis of data that the baking time of the method of the present invention is shortened to 1-4 hours and the moisture content is significantly reduced to 98.1 ppm at the same baking temperature; the conventional baking method is used for baking for 24 hours, and the moisture content is between 210 and 300 ppm. In contrast, it can be seen that the present method can reduce the bake time to 1/6 for the conventional bake time, while the moisture content is also reduced below 1/2 for the conventional bake moisture content. Namely, the method has the advantages that the baking time is shortened to 1-4 hours, and the moisture content is greatly reduced. Therefore, the battery cell baking efficiency is improved, and the battery cell baking effect is also improved.
Claims (6)
1. The baking method for reducing the water content of the electric core of the flexible package lithium battery is characterized by comprising the following steps of: the method comprises the following steps:
a. placing the battery core into a contact type clamp, and positioning and clamping with the clamping force of 100N;
b. the clamp and the battery cell are sent into an oven, and the vacuum pumping is carried out until the pressure is less than 50Pa, and the vacuum pumping time is less than or equal to 5 min;
c. introducing dry gas into the oven for less than or equal to 3 min;
d. the clamp is electrified and heated to 80-85 ℃, and the time of electrifying and heating is less than or equal to 40 min;
e. loosening the clamp until the clamping force of the clamp is 20N, vacuumizing again to less than 50Pa, vacuumizing for less than or equal to 5min, keeping the temperature of the clamp at 80-85 ℃ in a vacuum state, baking the battery cell for 120-150min, and vacuumizing once every 40-50min in the baking process, wherein the vacuumizing time is less than or equal to 2min each time;
f. stopping heating after the baking time is reached, introducing dry gas into the oven for less than or equal to 5min, and taking out the battery core;
g. sending the battery cell into cooling equipment, cooling the battery cell for 30 +/-5 min to ensure that the temperature of the battery cell is cooled to 45-55 ℃, and finishing baking the battery cell;
in the steps a-d, the clamping force of the clamp is kept constant, and the position of the battery cell relative to the clamp is constant in the transfer process of the clamp;
the contact type fixture comprises heating plates (2), clamping mechanisms (3), contact plates (4) and limiting plates (5), wherein a plurality of heating plates (2) are arranged, a battery cell (1) is arranged between every two adjacent heating plates (2), each heating plate (2) comprises a metal substrate (2-1), a heating sheet (2-2) and a resistance wire (2-3), the resistance wires (2-3) are arranged inside the heating sheets (2-2), and the heating sheets (2-2) are arranged on the outer layers of the metal substrates (2-1); the bottom of the heating sheet (2-2) is provided with a wiring terminal (2-4) which is inserted on the contact plate (4) in a contact mode, and the contact plate (4) is provided with a plug which is connected with an external power supply through the plug; the limiting plates (5) are arranged at two ends of the heating plate (2), and the clamping mechanism (3) clamps the heating plate (2) through the limiting plates (5).
2. The baking method for reducing the water content of the battery cell of the flexible package lithium battery according to claim 1, characterized in that: and in the steps c and f, introducing nitrogen as the drying gas.
3. The baking method for reducing the water content of the battery cell of the flexible package lithium battery according to claim 1, characterized in that: in the step e, the temperature of the clamp in a vacuum state is 85 ℃, and the baking time is 150 min.
4. The baking method for reducing the water content of the battery cell of the flexible package lithium battery according to claim 1, characterized in that: and g, cooling the battery cell for 30min, and cooling the battery cell to 45 ℃.
5. The baking method for reducing the water content of the battery cell of the flexible package lithium battery according to claim 1, characterized in that: the steps a to g are all operated when the environmental dew point is less than or equal to minus 30 ℃.
6. The baking method for reducing the water content of the battery cell of the flexible package lithium battery according to claim 1, characterized in that: the battery cell is characterized in that guide blocks (2-5) are arranged at the top ends of the heating plates (2), and the battery cell (1) is placed between the heating plates (2) along the guide blocks (2-5).
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| CN111342143B (en) * | 2020-03-12 | 2021-12-07 | 深圳市量能科技有限公司 | Preparation method of flexible package polymer lithium ion battery and battery |
| CN111628223A (en) * | 2020-04-30 | 2020-09-04 | 东莞汇洋动力科技有限公司 | Preparation method of soft package battery |
| CN111883849A (en) * | 2020-07-21 | 2020-11-03 | 合肥国轩高科动力能源有限公司 | Drying method of soft package lithium ion battery cell |
| CN112556400A (en) * | 2020-12-04 | 2021-03-26 | 湖北亿纬动力有限公司 | Baking clamp and baking method for square battery |
| CN112797740B (en) * | 2020-12-30 | 2022-10-14 | 湖北亿纬动力有限公司 | Baking method of lithium ion battery |
| CN113363409A (en) * | 2021-05-13 | 2021-09-07 | 昆山聚创新能源科技有限公司 | Battery cell baking method |
| CN114111228A (en) * | 2021-06-16 | 2022-03-01 | 合肥国轩高科动力能源有限公司 | Lithium battery rapid drying method |
| CN115540518B (en) * | 2021-06-30 | 2024-03-15 | 广东利元亨智能装备股份有限公司 | Baking method and application thereof |
| CN115014045A (en) * | 2022-05-30 | 2022-09-06 | 江西安驰新能源科技有限公司 | Lithium battery cell baking process |
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| CN2310967Y (en) * | 1997-06-25 | 1999-03-17 | 刘晓鹏 | Horizontal pulse press dryer |
| CN205004399U (en) * | 2015-07-27 | 2016-01-27 | 珠海光宇电池有限公司 | Lithium cell electricity core vacuum baking equipment |
| CN105655628B (en) * | 2016-03-22 | 2018-05-11 | 湖南立方新能源科技有限责任公司 | A kind of battery core quickly drying method |
| CN107345739A (en) * | 2016-05-06 | 2017-11-14 | 中信国安盟固利动力科技有限公司 | A kind of drying lithium ion battery case and drying device |
| CN206471432U (en) * | 2017-03-06 | 2017-09-05 | 东莞市法斯特智能装备有限公司 | A kind of battery core baking fixture |
| CN108444224B (en) * | 2018-03-19 | 2020-11-24 | 深圳市新浦自动化设备有限公司 | Battery cell drying method |
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