CN111564674A - Soft package lithium battery core formation process - Google Patents
Soft package lithium battery core formation process Download PDFInfo
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- CN111564674A CN111564674A CN201910115222.0A CN201910115222A CN111564674A CN 111564674 A CN111564674 A CN 111564674A CN 201910115222 A CN201910115222 A CN 201910115222A CN 111564674 A CN111564674 A CN 111564674A
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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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- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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
Abstract
The invention discloses a flexible package lithium battery cell formation process, which at least comprises the following steps: s1: pre-pressing; s2: a first formation charge; s3: second formation charging; s4: pulse charging; s5: a third formation charge; s6: and (5) air-extracting, packaging and curing. The S2 is charged to 20-30% SOC at a constant current of 0.02-0.06C, the S3 is charged to 40-55% SOC at 0.1-0.3C, and the S4 is charged to 60-70% SOC at a constant current of 0.3-0.5C. The invention can eliminate air bubbles between the pole piece and the diaphragm, ensure that a uniform and stable SEI film is formed on the surface of the pole piece, effectively reduce the internal resistance of the battery cell and improve the cycle performance of the battery cell; meanwhile, the charging current is increased along with the electric quantity and is only charged to 60% -70% of SOC, the formation time of the battery core can be shortened, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a flexible package lithium battery core formation process.
Background
The lithium ion battery is a green high-energy environment-friendly battery, and has the outstanding advantages of high energy density, environmental friendliness, no memory effect, long cycle life, small self-discharge and the like, so the lithium ion battery is widely concerned in the application of mobile phone batteries, mobile power supplies, electric vehicles and the like. The preparation process of the lithium ion battery is various, and the performance of the lithium ion battery is influenced by the processes of each step from material preparation, coating, rolling, slitting, sheet making to winding, first sealing, baking, liquid injection, formation, second sealing and capacity grading. Especially, the step from preparation to back-end formation process is very important. Formation is a process of forming a solid electrolyte film (SEI film) by first charging a battery after standing a liquid injection. Different forms of SEI films formed by different formation processes have different forms. The morphology of the SEI film directly affects the performance of the cell, such as rate and high-charge performance, particularly the cycle performance, i.e., service life, of the battery. The conventional low-current precharging method contributes to stable SEI film formation, but low-current charging causes the resistance of the formed SEI film to be increased and the time to be long, so that the cycle, rate performance, production efficiency and the like of the battery are influenced.
Chinese patent CN108615945 is a formation method of a lithium ion battery, which is to lay the opening of the lithium ion battery after liquid injection in vacuum, and then perform negative pressure pre-formation. Although the formation method of the lithium ion battery can form a relatively uniform SEI film on the surface of the electrode, the cycle performance of the battery is improved, and the electrical performance and the safety of the battery are improved, the formation method of the lithium ion battery has extremely high requirement on required equipment and harsh conditions due to the opening adopted by the formation method, the production cost of an enterprise is increased invisibly, and the industrialization is difficult to realize.
Based on the above disadvantages, the formation process of the lithium ion battery needs to be improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a flexible package lithium battery cell formation process, which aims to reduce the internal resistance of a battery cell, improve the cycle performance of the battery cell, shorten the formation time and improve the production efficiency.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a flexible package lithium battery cell formation process comprises the following steps:
s1: pre-pressing: fully soaking the battery cell after liquid injection, fixing the battery cell on a high-temperature forming fixture, applying pressure for prepressing, setting the temperature to be 50-70 ℃, and keeping the temperature for 2-5 min;
s2: first formation charging: charging the pre-pressed battery cell to 20-30% SOC at a constant current of 0.02-0.06C, and then maintaining the pressure and standing for 2-5 min;
s3: second formation charging: charging the battery cell to 40-55% SOC at a constant current of 0.1-0.3C, and then holding the voltage for 30-90S;
s4: pulse charging: pulse discharging the battery cell for 1-3S, and standing for 5S;
s5: third formation charging: charging the battery cell to 60-70% SOC at a constant current of 0.3-0.5C, and then repeating the step S4;
s6: air-extracting, packaging and curing: and cooling the high-temperature clamp to room temperature, taking down the battery cell, performing air exhaust packaging, and curing for 20-30 h.
The pre-pressing pressure is 0.1-0.3 MPa, and the clamp temperature is 50-70 ℃.
The clamp formation temperature of the first formation charging, the second formation charging and the third formation charging is 40-60 ℃.
The first formation charging electric quantity is 20-30% SOC, and the pressure is 0.2-0.3 MPa.
The second formation charging electric quantity is 40-55% SOC, and the pressure is 0.3-0.5 MPa.
The third formation charging electric quantity is 60% -70% SOC, and the pressure is 0.5-1.0 MPa.
The pulse charging time is 1-3S.
The invention has the beneficial effects that:
(1) the battery cell is pre-pressed, so that the pole piece and the diaphragm are closer, the battery cell is further soaked by the electrolyte, and the formation efficiency is improved;
(2) in the formation process, the pressure and the charging current are increased simultaneously, the gas generated by formation is effectively discharged to the air bag, a stable SEI film is favorably formed, the internal resistance of the battery cell is reduced, and the cycle performance of the battery cell is improved; meanwhile, pulse charging is selected after the large-current charging, so that the polarization phenomenon caused by the large current can be quickly eliminated;
(3) the battery formation is only charged to 60-70% SOC, so that the battery formation time is shortened, and the production efficiency is improved.
Drawings
Fig. 1 is a process flow chart of the flexible package lithium battery cell formation process of the invention.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and the description in this section is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
The invention relates to a flexible package lithium battery cell formation process, which comprises the following steps:
s1: pre-pressing: fully soaking the battery cell after liquid injection, fixing the battery cell on a high-temperature forming fixture, applying pressure for prepressing, setting the temperature to be 50-70 ℃, and keeping the temperature for 2-5 min;
s2: first formation charging: charging the pre-pressed battery cell to 20-30% SOC at a constant current of 0.02-0.06C, and then maintaining the pressure and standing for 2-5 min;
s3: second formation charging: charging the battery cell to 40-55% SOC at a constant current of 0.1-0.3C, and then holding the voltage for 30-90S;
s4: pulse charging: pulse discharging the battery cell for 1-3S, and standing for 5S;
s5: third formation charging: charging the battery cell to 60-70% SOC at a constant current of 0.3-0.5C, and then repeating the step S4;
s6: air-extracting, packaging and curing: and cooling the high-temperature clamp to room temperature, taking down the battery cell, performing air exhaust packaging, and curing for 20-30 h.
The pre-pressing pressure is 0.1-0.3 MPa, and the clamp temperature is 50-70 ℃.
The clamp formation temperature of the first formation charging, the second formation charging and the third formation charging is 40-60 ℃.
The first formation charging electric quantity is 20-30% SOC, and the pressure is 0.2-0.3 MPa.
The second formation charging electric quantity is 40-55% SOC, and the pressure is 0.3-0.5 MPa.
The third formation charging electric quantity is 60% -70% SOC, and the pressure is 0.5-1.0 MPa.
The pulse charging time is 1-3S.
In the technical scheme, the soft package lithium battery cell formation process comprises the following steps:
preferably, the pre-pressing pressure in S1 is 0.2-0.3 MPa, the pre-pressing temperature is 50-60 ℃, and the time is kept for 4-5 min.
Preferably, the S2 is charged to 28% -30% SOC at a constant current of 0.03-0.05C, and the formation pressure is 0.3 MPa.
Preferably, the S3 is charged to 45-50% SOC at a constant current of 0.2-0.3C, and the formation pressure is 0.4-0.5 MPa.
Preferably, the S5 is charged to 60-65% SOC at a constant current of 0.4-0.5C, and the formation pressure is 0.7-0.8 MPa.
Preferably, the pulse charging time is 2-3 s.
Example 1:
s1: pre-pressing: fully soaking the battery core after liquid injection, fixing the battery core on a high-temperature forming fixture, applying pressure of 0.2MPa for prepressing, setting the temperature at 60 ℃, and keeping the temperature for 5 min;
s2: first formation charging: charging the pre-pressed battery cell to 25% SOC at a constant current of 0.03C and a pressure of 0.2MPa, and then maintaining the pressure and standing for 3 min;
s3: second formation charging: the battery cell is charged to 45% SOC at a constant current of 0.1C, the pressure is 0.4MPa, and the battery cell is kept for 60S after the charging is finished;
s4: pulse charging: pulse discharging the battery cell for 3S, and laying aside for 5S;
s5: third formation charging: the battery cell is charged to 65% SOC at a constant current of 0.3C and under the pressure of 0.7MPa, and then the step S4 is repeated;
s6: air-extracting, packaging and curing: and cooling the high-temperature clamp to room temperature, taking down the battery cell, performing air exhaust packaging, and curing for 20-30 h.
Example 2:
s1: pre-pressing: fully soaking the battery core after liquid injection, fixing the battery core on a high-temperature forming fixture, applying pressure of 0.2MPa for prepressing, setting the temperature at 60 ℃, and keeping the temperature for 5 min;
s2: first formation charging: charging the pre-pressed battery cell to 27% SOC at a constant current of 0.04C and a pressure of 0.2MPa, and then maintaining the pressure and standing for 3 min;
s3: second formation charging: the battery cell is charged to 55% SOC at a constant current of 0.3C, the pressure is 0.5MPa, and the battery cell is kept for 60 seconds after the charging is finished;
s4: pulse charging: pulse discharging the battery cell for 3S, and laying aside for 5S;
s5: third formation charging: the battery cell is charged to 70% SOC at a constant current of 0.4C and under the pressure of 0.8MPa, and then the step S4 is repeated;
s6: air-extracting, packaging and curing: and cooling the high-temperature clamp to room temperature, taking down the battery cell, performing air exhaust packaging, and curing for 20-30 h.
Example 3:
s1: pre-pressing: fully soaking the battery core after liquid injection, fixing the battery core on a high-temperature forming fixture, applying pressure of 0.3MPa for prepressing, setting the temperature at 60 ℃, and keeping the temperature for 5 min;
s2: first formation charging: charging the pre-pressed battery cell to 30% SOC at a constant current of 0.05C and a pressure of 0.2MPa, and then maintaining the pressure and standing for 3 min;
s3: second formation charging: the battery cell is charged to 50% SOC at a constant current of 0.2C, the pressure is 0.4MPa, and the battery cell is kept for 60 seconds after the charging is finished;
s4: pulse charging: pulse discharging the battery cell for 3S, and laying aside for 5S;
s5: third formation charging: the battery cell is charged to 60% SOC at a constant current of 0.3C and under a pressure of 0.6MPa, and then the step S4 is repeated;
s6: air-extracting, packaging and curing: and cooling the high-temperature clamp to room temperature, taking down the battery cell, performing air exhaust packaging, and curing for 20-30 h.
Comparative example 1:
s1: standing for 5min, and performing constant current charging on the battery at a current of 0.05C, with a voltage limit of 3.0V and a time limit of 60 min;
s2: standing for 3min, and performing constant-current charging on the battery at a current of 0.1C, with a voltage limit of 3.5V and a time limit of 60 min;
s3: standing for 3min, and performing constant-current charging on the battery at a current of 0.3C, wherein the voltage is limited to 3.85V and the time is limited to 90 min;
s4: standing for 3min, performing constant current charging on the battery at a current of 0.5C, limiting the voltage to 4.2V, performing constant voltage charging to a current-limiting value of 0.05C, and limiting the time to 180 min;
s5: and (5) placing.
The invention provides a flexible package lithium battery core formation process, which reduces the internal resistance of a battery core, improves the cycle performance of the battery core, shortens the formation time and improves the production efficiency.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (7)
1. A flexible package lithium battery cell formation process is characterized by comprising the following steps:
s1: pre-pressing: fully soaking the battery cell after liquid injection, fixing the battery cell on a high-temperature forming fixture, applying pressure for prepressing, setting the temperature to be 50-70 ℃, and keeping the temperature for 2-5 min;
s2: first formation charging: charging the pre-pressed battery cell to 20-30% SOC at a constant current of 0.02-0.06C, and then maintaining the pressure and standing for 2-5 min;
s3: second formation charging: charging the battery cell to 40-55% SOC at a constant current of 0.1-0.3C, and then holding the voltage for 30-90S;
s4: pulse charging: pulse discharging the battery cell for 1-3S, and standing for 5S;
s5: third formation charging: charging the battery cell to 60-70% SOC at a constant current of 0.3-0.5C, and then repeating the step S4;
s6: air-extracting, packaging and curing: and cooling the high-temperature clamp to room temperature, taking down the battery cell, performing air exhaust packaging, and curing for 20-30 h.
2. The formation process of the lithium battery cell of the flexible package according to claim 1, wherein the pre-pressing pressure is 0.1-0.3 MPa, and the clamp temperature is 50-70 ℃.
3. The formation process of the flexible package lithium battery cell according to claim 1, wherein the clamp formation temperature of the first formation charging, the second formation charging and the third formation charging is 40-60 ℃.
4. The formation process of the flexible package lithium battery cell according to claim 1, wherein the first formation charging electric quantity is 20-30% SOC, and the pressure is 0.2-0.3 MPa.
5. The formation process of the flexible package lithium battery cell according to claim 1, wherein the second formation charging electric quantity is 40% -55% SOC, and the pressure is 0.3-0.5 MPa.
6. The formation process of the flexible package lithium battery cell according to claim 1, wherein the third formation charging capacity is 60-70% SOC, and the pressure is 0.5-1.0 MPa.
7. The formation process of the flexible package lithium battery cell according to claim 1, wherein the pulse charging time is 1-3S.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510265A (en) * | 2020-11-06 | 2021-03-16 | 天津力神电池股份有限公司 | One-step formation hot-pressing method for improving cycle performance of soft package lithium ion battery |
| CN112701368A (en) * | 2020-12-29 | 2021-04-23 | 惠州亿纬创能电池有限公司 | Formation method and lithium ion battery |
| CN113451673A (en) * | 2021-06-29 | 2021-09-28 | 惠州市赛能电池有限公司 | Formation method of lithium battery, lithium battery and preparation method thereof |
| CN113471544A (en) * | 2021-06-29 | 2021-10-01 | 合肥国轩高科动力能源有限公司 | Formation pretreatment method and formation method of soft package lithium ion battery |
| CN113675487A (en) * | 2021-06-28 | 2021-11-19 | 宁波维科电池有限公司 | Formation pressurization method and system of polymer battery cell |
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