CN112086692B - Formation and aging combined method of soft package lithium ion battery and soft package lithium ion battery - Google Patents

Formation and aging combined method of soft package lithium ion battery and soft package lithium ion battery Download PDF

Info

Publication number
CN112086692B
CN112086692B CN202010993215.3A CN202010993215A CN112086692B CN 112086692 B CN112086692 B CN 112086692B CN 202010993215 A CN202010993215 A CN 202010993215A CN 112086692 B CN112086692 B CN 112086692B
Authority
CN
China
Prior art keywords
lithium ion
ion battery
aging
formation
package lithium
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.)
Active
Application number
CN202010993215.3A
Other languages
Chinese (zh)
Other versions
CN112086692A (en
Inventor
施利毅
张宁
袁帅
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.)
Shanghai University (zhejiang Jiaxing) Emerging Industry Research Institute
Original Assignee
Shanghai University (zhejiang Jiaxing) Emerging Industry Research Institute
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 Shanghai University (zhejiang Jiaxing) Emerging Industry Research Institute filed Critical Shanghai University (zhejiang Jiaxing) Emerging Industry Research Institute
Priority to CN202010993215.3A priority Critical patent/CN112086692B/en
Publication of CN112086692A publication Critical patent/CN112086692A/en
Application granted granted Critical
Publication of CN112086692B publication Critical patent/CN112086692B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a formation and aging combined method for a soft package lithium ion battery, which comprises the following steps: segmenting the soft package lithium ion battery cell to be formed into: according to the first formation temperature a 1: 20-25 ℃, first formation pressure B1: and (3) charging to a first cut-off voltage by a constant current of 0.05-0.15 MPa: 3.20-3.45V; according to the second formation temperature a 2: 26-35 ℃ and a second formation pressure B2: and (3) charging to a second cut-off voltage by a constant current of 0.16-0.30 MPa: 3.60-3.80V; according to a third formation temperature a 3: 36-45 ℃ and a third formation pressure B3: and (3) charging to a third cut-off voltage at a constant current of 0.30-0.70 MPa: 3.95-4.10V; carrying out sectional aging on the formed soft package lithium ion battery cell; the above method can improve the integrity of the SEI film and the cycle performance of the battery.

Description

Formation and aging combined method of soft package lithium ion battery and soft package lithium ion battery
Technical Field
The application relates to the technical field of soft package lithium ion batteries, in particular to a formation and aging combined method of a soft package lithium ion battery and the soft package lithium ion battery.
Background
The lithium ion battery is a green high-energy environment-friendly battery appearing in 90 s of the 20 th century, has the outstanding advantages of high energy density, environmental friendliness, no memory effect, long cycle life, less self-discharge and the like, is an ideal power supply for small and light electronic devices such as cameras, mobile phones, notebook computers, portable measuring instruments and the like, and is also an ideal light high-energy power source for future electric vehicles and military use. Therefore, lithium ion batteries have become a hot spot of extensive research in the battery world in recent years.
Formation is an important process in the production process of lithium ion batteries, a passivation layer, namely a solid electrolyte interface film (SEI) is formed on the surface of a negative electrode during formation, the quality and the self-connection of the SEI affect the electrochemical properties of the batteries, such as cycle life, stability, self-discharge property, safety and the like, and the requirement of sealing and maintenance-free secondary batteries is met, but different SEI films formed by different formation processes have different influences on the performances of the batteries.
Although the conventional low current precharge manner contributes to stable SEI film formation, the long-term low current charging may reduce the cycle performance of the lithium ion battery. Therefore, how to explore an efficient lithium battery formation process is necessary.
Disclosure of Invention
The invention provides a formation and aging combined method of a soft package lithium ion battery and the soft package lithium ion battery, which aim to solve or partially solve the technical problem that the cycle performance of the lithium ion battery is influenced by a longer process of the conventional formation method adopting low-current charging.
In order to solve the technical problem, the invention provides a combination method for formation and aging of a soft package lithium ion battery, which comprises the following steps:
segmenting the soft package lithium ion battery cell to be formed into sections to obtain the formed soft package lithium ion battery cell; the temperature-changing and segmenting formation specifically comprises the following steps:
according to the first formation temperature a 1: 20-25 ℃, first formation pressure B1: the constant current charging method comprises the steps that 0.05-0.15 MPa and a first current C1 are carried out, and the soft package lithium ion cell is subjected to constant current charging to a first cut-off voltage U1;
according to the second formation temperature a 2: 26-35 ℃ and a second formation pressure B2: charging the soft package lithium ion battery cell to a second cut-off voltage U2 at a constant current of 0.16-0.30 MPa and a second current C2;
according to a third formation temperature a 3: 36-45 ℃ and a third formation pressure B3: charging the soft package lithium ion battery cell to a third cut-off voltage U3 at a constant current of 0.30-0.70 MPa and a third current C3;
carrying out sectional aging on the formed soft package lithium ion battery cell to obtain an aged soft package lithium ion battery cell; the segment aging specifically comprises:
according to a first aging temperature D1: 25-30 ℃ and a first aging pressure E1: carrying out first-stage aging on the soft package lithium ion battery cell at 0.2-0.4 MPa for a first aging time T1;
according to the second aging temperature D2: 31-40 ℃ and the second aging pressure E2: carrying out second-stage aging on the soft package lithium ion battery cell at 0.4-0.6 MPa for a second aging time T2;
according to the third aging temperature D3: 41-45 ℃ and the third aging pressure E3: and (3) carrying out third-stage aging on the soft package lithium ion battery cell at 0.6-1.0 MPa and for a third aging time T3.
Optionally, before segmenting the soft-package lithium ion battery cell to be formed into a soft-package lithium ion battery cell and obtaining the formed soft-package lithium ion battery cell, the forming and aging combined method further includes:
and standing the liquid-injected soft package lithium ion battery cell for 24-48 hours at normal temperature and normal pressure to obtain the soft package lithium ion battery cell to be formed.
Further, after the soft package lithium ion battery cell after the liquid injection is completed is stood for 24-48 hours at normal temperature and normal pressure, after the soft package lithium ion battery cell to be formed is obtained, the soft package lithium ion battery cell to be formed is segmented into sections, and before the soft package lithium ion battery cell after the formation is obtained, the formation and aging combined method further comprises the following steps:
and clamping the soft package lithium ion battery cell to be formed to a first formation pressure B1, and standing for 4-8 hours.
Optionally, the first current C1 is 0.01-0.05C, and the first cut-off voltage U1 is 3.20-3.45V.
Optionally, the second current C2 is 0.06-0.1C, and the second cut-off voltage U2 is 3.60-3.80V.
Optionally, the third current C3 is 0.1-0.3C, and the third cut-off voltage U3 is 3.95-4.10V.
Optionally, the first aging time T1 is 12 to 16 hours.
Optionally, the second aging time T2 is 16-24 hours.
Optionally, the third aging time T2 is 12 to 24 hours.
According to the same inventive concept of the above technical scheme, the invention also provides a soft package lithium ion battery, which comprises a soft package lithium ion battery cell, wherein the soft package lithium ion battery cell is subjected to formation and aging by adopting any one of the formation and aging combined methods of the above technical schemes.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a formation-aging combined method of a soft package lithium ion battery cell, which is characterized in that the formation pressure and the formation temperature are determined by the scheme and then reasonably matched with the charging current and the cut-off voltage, so that the polarization phenomenon of the lithium ion battery cell in the formation process can be effectively reduced, the intensive uniformity of the current in the battery and the matching property of the temperature and the pressure in the formation process are effectively improved, the polarization and swelling phenomena generated in the formation charging process are avoided, and the generated SEI film is more compact; after formation is finished, three-stage heating and boosting aging is carried out, and aging temperature and aging pressure parameters are determined according to the scheme, so that the aging time can be effectively reduced, the damage of long-time high temperature to a battery and the influence of large temperature difference on an SEI film are reduced, and the stability and completeness of the SEI film are ensured; secondly, because the temperature rising type stepped aging process is adopted, the reaction speed and the gas production rate are different in each section of aging process, and the gas in the air bag can be prevented from permeating into the battery cell when the pressure is too low and the gas production rate is too high by gradually increasing the holding pressure in the aging process; thirdly, the aging pressure is gradually increased, so that the damage of the traditional continuous high pressure to the battery can be avoided; in general, through the matching of the formation-aging process parameters, the aging-formation time can be shortened, the integrity and stability of the SEI film can be improved, and the cycle performance and safety performance of the battery can be improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic process diagram of a combined formation and aging method for a soft package lithium ion battery according to an embodiment of the invention;
fig. 2 is a graph showing the results of a cycle performance test of batteries according to an example of the present invention and a comparative example.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention are either commercially available or can be prepared by existing methods.
Researches show that the impedance of the formed SEI film is increased due to long-time low-current charging, so that the rate discharge performance of the lithium ion battery is influenced, and the production efficiency is influenced on one hand when the formation process is too long, and the integrity of the SEI film is also influenced on the other hand, so that the cycle performance of the battery is influenced.
Based on the above analysis, the present embodiment provides a combination method of formation and aging, and the overall idea is as follows:
s1: segmenting the soft package lithium ion battery cell to be formed into sections to obtain the formed soft package lithium ion battery cell; the temperature-changing and segmenting formation specifically comprises the following steps:
according to the first formation temperature a 1: 20-25 ℃, first formation pressure B1: the constant current charging method comprises the steps that 0.05-0.15 MPa and a first current C1 are carried out, and the soft package lithium ion cell is subjected to constant current charging to a first cut-off voltage U1;
according to the second formation temperature a 2: 26-35 ℃ and a second formation pressure B2: charging the soft package lithium ion battery cell to a second cut-off voltage U2 at a constant current of 0.16-0.30 MPa and a second current C2;
according to a third formation temperature a 3: 36-45 ℃ and a third formation pressure B3: charging the soft package lithium ion battery cell to a third cut-off voltage U3 at a constant current of 0.30-0.70 MPa and a third current C3;
s2: carrying out sectional aging on the formed soft package lithium ion battery cell to obtain an aged soft package lithium ion battery cell; the segment aging specifically comprises:
according to a first aging temperature D1: 25-30 ℃ and a first aging pressure E1: carrying out first-stage aging on the soft package lithium ion battery cell at 0.2-0.4 MPa for a first aging time T1;
according to the second aging temperature D2: 31-40 ℃ and the second aging pressure E2: carrying out second-stage aging on the soft package lithium ion battery cell at 0.4-0.6 MPa for a second aging time T2;
according to the third aging temperature D3: 41-45 ℃ and the third aging pressure E3: and (3) carrying out third-stage aging on the soft package lithium ion battery cell at 0.6-1.0 MPa and for a third aging time T3.
Wherein preferred values of the first formation pressure B1 include 0.05MPa, 0.1MPa, preferred values of the second formation pressure B2 include 0.2MPa, 0.3MPa, and preferred values of the third formation pressure B3 include 0.4MPa, 0.6MPa, 0.7 MPa; preferred values for the second formation temperature a2 include 30 ℃ and preferred values for the third formation temperature A3 include 40 ℃.
Preferred values for the second aging temperature D2 include 35 ℃, and preferred values for the first aging pressure E1 include 0.3MPa, 0.4 MPa; preferred values for the second aging pressure E2 include 0.5MPa, 0.6 MPa; preferred values for the third aging pressure E3 include 0.8MPa, 1.0 MPa.
The method is a formation-aging combined method obtained by summarizing after a large number of tests and analyses, firstly, the soft package lithium ion battery cell is placed in the existing formation-aging integrated device, then formation is carried out in a three-stage heating (temperature of a clamping tool) and boosting (clamping pressure of the formation clamping tool) mode, and the formation pressure and the formation temperature are reasonably matched with charging current and cut-off voltage, so that the polarization phenomenon of the lithium ion battery cell in the formation process can be effectively reduced, the intensive uniformity of the current and the matching property of the temperature and the pressure in the battery in the formation process are effectively improved, the polarization and bulging phenomenon generated in the formation charging process are avoided, the generated SEI film (solid electrolyte interface film) is more compact, and the electrical property and the safety performance of the battery are improved.
Three-stage heating and boosting aging is carried out immediately after formation is finished, the aging time can be effectively shortened by using the temperature and pressure parameters, the damage of long-time high temperature to the battery is reduced, the influence of large temperature difference on an SEI film is reduced, and the stability and the completeness of the SEI film are ensured. Because the method in the embodiment adopts different temperature aging conditions, the reaction speed and the gas production rate in each section of aging process are different, and the gas in the air bag can be prevented from permeating into the battery cell when the pressure is too low and the gas production rate is too high by gradually increasing the holding pressure in the aging process; meanwhile, the gradual rise of the pressure can avoid the damage of the traditional continuous high pressure to the battery.
In general, by combining the formation-aging processes, the aging-formation time can be shortened, and the integrity and stability of the SEI film can be improved, thereby improving the cycle performance and safety performance of the battery.
Optionally, before segmenting the soft-package lithium ion battery cell to be formed into a soft-package lithium ion battery cell and obtaining the formed soft-package lithium ion battery cell, the forming and aging combined method further includes:
s0: and standing the liquid-injected soft package lithium ion battery cell for 24-48 hours at normal temperature and normal pressure to obtain the soft package lithium ion battery cell to be formed.
Further, at S0: standing the soft package lithium ion battery cell after liquid injection is completed for 24-48 hours at normal temperature and normal pressure, and after the soft package lithium ion battery cell to be formed is obtained, at S1: the method comprises the following steps of segmenting the soft package lithium ion battery cell to be formed into sections, and before the soft package lithium ion battery cell after formation is obtained, the formation and aging combined method further comprises the following steps:
s01: and clamping the soft package lithium ion battery cell to be formed to a first formation pressure B1, and standing for 4-8 hours.
Optionally, at S2: and after the formed soft package lithium ion battery cell is aged in a segmented manner and the aged soft package lithium ion battery cell is obtained, the forming and aging combined method further comprises the following steps:
s3: and exhausting air and sealing the aged soft package lithium ion battery cell.
Gases are generated during the formation-aging process, so that the gases need to be pumped out and then packaged for a second time.
In order to further reasonably match formation parameters such as pressure, time, current and temperature and reduce polarization phenomenon of battery formation to the maximum extent, the optional ranges of charging current and cut-off voltage obtained by tests are as follows:
optionally, the first current C1 is 0.01-0.05C, and the first cut-off voltage U1 is 3.20-3.45V.
Optionally, the second current C2 is 0.06-0.1C, and the second cut-off voltage U2 is 3.60-3.80V.
Optionally, the third current C3 is 0.1-0.3C, and the third cut-off voltage U3 is 3.95-4.10V.
Based on the formation process, the corresponding aging time selectable ranges are as follows:
optionally, the first aging time T1 is 12-16 hours; the second aging time T2 is 16-24 hours; the third aging time T2 is 12-24 hours.
Based on the same inventive concept of the foregoing embodiment, in yet another optional embodiment, there is further provided a soft-package lithium ion battery, including a soft-package lithium ion battery, where the soft-package lithium ion battery is formed and aged by using the formation and aging combination method in the foregoing embodiment.
In the following examples, the above protocol is illustrated with specific experimental data:
example 1:
the battery is placed in a formation-aging integrated device and is formed according to the following three-stage formation:
(1) setting the temperature of a clamp to be 20 ℃, the pressure of the clamp to be 0.05MPa, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.45V at a constant current of 0.05 ℃;
(2) setting the temperature of a clamp to be 30 ℃ and the pressure of the clamp to be 0.2MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.8V at a constant current of 0.1C;
(3) setting the temperature of the clamp to be 40 ℃ and the pressure of the clamp to be 0.4MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.95V at a constant current of 0.2C;
the aging step is as follows:
(1) setting the temperature of the clamp to be 25 ℃, the pressure of the clamp to be 0.3MPa, and standing for 16h after the temperature and the pressure reach set values;
(2) setting the temperature of the clamp to be 35 ℃, the pressure of the clamp to be 0.5MPa, and standing for 16h after the temperature and the pressure reach set values;
(3) setting the temperature of the clamp to be 45 ℃, the pressure of the clamp to be 0.8MPa, standing for 12h after the temperature and the pressure reach set values, and finishing aging.
After the battery cell is aged, the battery cell is prepared into a soft package lithium ion battery with the nominal capacity of 3000mAh through subsequent processes such as air exhaust, secondary sealing and the like, and the cycle performance of the battery is tested: the residual capacity and the thickness change ratio after 400 weeks were measured after 100 weeks, 200 weeks, 300 weeks, and 400 weeks of charge-discharge cycles, respectively, and the presence or absence of swelling was observed, and the data of the results are shown in table 1 and fig. 1;
example 2:
the battery is placed in a formation-aging integrated device to be formed according to the following three sections:
(1) setting the temperature of a clamp to be 20 ℃, the pressure of the clamp to be 0.1MPa, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.25V at a constant current of 0.05 ℃;
(2) setting the temperature of a clamp to be 30 ℃ and the pressure of the clamp to be 0.3MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.65V at a constant current of 0.1C;
(3) setting the temperature of a clamp to be 40 ℃ and the pressure of the clamp to be 0.7MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.95V at a constant current of 0.2C;
the aging step is as follows:
(1) setting the temperature of the clamp to be 30 ℃, the pressure of the clamp to be 0.4MPa, and standing for 12 hours after the temperature and the pressure reach set values;
(2) setting the temperature of the clamp to be 40 ℃, the pressure of the clamp to be 0.6MPa, and standing for 16h after the temperature and the pressure reach set values;
(3) setting the temperature of the clamp to be 45 ℃, the pressure of the clamp to be 1MPa, standing for 24h after the temperature and the pressure reach set values, and finishing aging.
After the battery cell is aged, the battery cell is prepared into a soft package lithium ion battery with the nominal capacity of 3000mAh through subsequent processes such as air exhaust, secondary sealing and the like, and the cycle performance of the battery is tested: the residual capacity and the thickness change ratio after 400 weeks were measured after 100 weeks, 200 weeks, 300 weeks, and 400 weeks of charge-discharge cycles, respectively, and the presence or absence of swelling was observed, and the data of the results are shown in table 1 and fig. 1;
example 3
The battery is placed in a formation-aging integrated device to be formed according to the following three sections:
(1) setting the temperature of a clamp to be 25 ℃, the pressure of the clamp to be 0.05MPa, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.45V at a constant current of 0.05 ℃;
(2) setting the temperature of a clamp to be 35 ℃ and the pressure of the clamp to be 0.2MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.8V at a constant current of 0.1C;
(3) setting the temperature of a clamp to be 45 ℃ and the pressure of the clamp to be 0.4MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 4.1V at a constant current of 0.2C;
the aging step is as follows:
(1) setting the temperature of the clamp to be 30 ℃, the pressure of the clamp to be 0.3MPa, and standing for 16h after the temperature and the pressure reach set values;
(2) setting the temperature of the clamp to be 40 ℃, the pressure of the clamp to be 0.5MPa, and standing for 16h after the temperature and the pressure reach set values;
(3) setting the temperature of the clamp to be 45 ℃, the pressure of the clamp to be 0.8MPa, standing for 12h after the temperature and the pressure reach set values, and finishing aging.
After the battery cell is aged, the battery cell is prepared into a soft package lithium ion battery with the nominal capacity of 3000mAh through subsequent processes such as air exhaust, secondary sealing and the like, and the cycle performance of the battery is tested: the residual capacity and the thickness change ratio after 400 weeks were measured after 100 weeks, 200 weeks, 300 weeks, and 400 weeks of charge-discharge cycles, respectively, and the presence or absence of swelling was observed, and the data of the results are shown in table 1 and fig. 1;
example 4:
the battery is placed in a formation-aging integrated device to be formed according to the following three sections:
(1) setting the temperature of a clamp to be 20 ℃, the pressure of the clamp to be 0.05MPa, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.45V at a constant current of 0.05 ℃;
(2) setting the temperature of a clamp to be 30 ℃ and the pressure of the clamp to be 0.2MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.65V at a constant current of 0.1C;
(3) setting the temperature of the clamp to be 40 ℃ and the pressure of the clamp to be 0.4MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.95V at a constant current of 0.2C;
the aging step is as follows:
(1) setting the temperature of the clamp to be 25 ℃, the pressure of the clamp to be 0.3MPa, and standing for 16h after the temperature and the pressure reach set values;
(2) setting the temperature of the clamp to be 35 ℃, the pressure of the clamp to be 0.5MPa, and standing for 16h after the temperature and the pressure reach set values;
(3) setting the temperature of the clamp to be 45 ℃, the pressure of the clamp to be 0.8MPa, standing for 12h after the temperature and the pressure reach set values, and finishing aging.
After the battery cell is aged, the battery cell is prepared into a soft package lithium ion battery with the nominal capacity of 3000mAh through subsequent processes such as air exhaust, secondary sealing and the like, and the cycle performance of the battery is tested: the residual capacity and the thickness change ratio after 400 weeks were measured after 100 weeks, 200 weeks, 300 weeks, and 400 weeks of charge-discharge cycles, respectively, and the presence or absence of swelling was observed, and the data of the results are shown in table 1 and fig. 1;
example 5:
the battery is placed in a formation-aging integrated device to be formed according to the following three sections:
(1) setting the temperature of a clamp to be 22 ℃, the pressure of the clamp to be 0.1MPa, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.4V at a constant current of 0.05 ℃;
(2) setting the temperature of a clamp to be 28 ℃ and the pressure of the clamp to be 0.2MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 3.8V at a constant current of 0.1C;
(3) setting the temperature of a clamp to be 40 ℃ and the pressure of the clamp to be 0.6MPa, raising the temperature and boosting the pressure, standing for 5min after the temperature and the pressure reach set values, and then charging to be 4.1V at a constant current of 0.2C;
the aging step is as follows:
(1) setting the temperature of the clamp to be 25 ℃, the pressure of the clamp to be 0.3MPa, and standing for 16h after the temperature and the pressure reach set values;
(2) setting the temperature of the clamp to be 35 ℃, the pressure of the clamp to be 0.5MPa, and standing for 16h after the temperature and the pressure reach set values;
(3) setting the temperature of the clamp to be 45 ℃, the pressure of the clamp to be 0.8MPa, standing for 12h after the temperature and the pressure reach set values, and finishing aging.
After the battery cell is aged, the battery cell is prepared into a soft package lithium ion battery with the nominal capacity of 3000mAh through subsequent processes such as air exhaust, secondary sealing and the like, and the cycle performance of the battery is tested: the residual capacity and the thickness change ratio after 400 weeks were measured after 100 weeks, 200 weeks, 300 weeks, and 400 weeks of charge-discharge cycles, respectively, and the presence or absence of swelling was observed, and the data of the results are shown in table 1 and fig. 1;
comparative example:
keeping the temperature of the clamp at 25 ℃, keeping the pressure of the clamp at 0.2Mpa, standing for 5min, and then carrying out formation according to the following three stages:
(1) constant current charging: the current is 0.05C, the time is 2h, and the voltage is limited to 3.45V;
(2) constant current charging: the current is 0.1C, the time is 3h, and the voltage is limited to 3.8V;
(3) constant current charging: the current is 0.2C, the time is 3h, and the voltage is limited to 3.95V;
standing for 10min after the formation is complete;
and then aging, wherein the aging steps are as follows:
setting the temperature of a clamp to be 45 ℃, the pressure of the clamp to be 0.2MPa, standing for 48 hours after the temperature and the pressure reach set values, and finishing aging;
after the battery cell is aged, the battery cell is prepared into a soft package lithium ion battery with the nominal capacity of 3000mAh through subsequent processes such as air exhaust, secondary sealing and the like, and the cycle performance of the battery is tested: the residual capacity and the thickness change ratio after 400 weeks were measured after 100 weeks, 200 weeks, 300 weeks, and 400 weeks of charge-discharge cycles, respectively, and the presence or absence of swelling was observed, and the data are shown in table 1 and fig. 1;
and (4) analyzing results:
the cycle performance test data of the embodiments 1 to 5 and the comparative example are shown in table 1 and fig. 1, and it can be seen that by adopting the three-stage heating, boosting and flow increasing formation process of the invention and combining the three-stage heating and boosting aging process, the residual capacity of the battery after cyclic charge and discharge is obviously improved compared with the conventional constant-temperature and constant-voltage formation and constant-temperature and constant-voltage aging scheme, and the thickness change of the battery after 400 weeks in the embodiment is obviously smaller than that in the comparative example, and the battery does not deform at all.
Table 1: lithium battery cycle performance test result
Figure BDA0002691653950000121
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a formation-aging combined method of a soft package lithium ion battery cell, which is characterized in that the formation pressure and the formation temperature are determined by the scheme and then reasonably matched with the charging current and the cut-off voltage, so that the polarization phenomenon of the lithium ion battery cell in the formation process can be effectively reduced, the intensive uniformity of the current in the battery and the matching property of the temperature and the pressure in the formation process are effectively improved, the polarization and swelling phenomena generated in the formation charging process are avoided, and the generated SEI film is more compact; after formation is finished, three-stage heating and boosting aging is carried out, and aging temperature and aging pressure parameters are determined according to the scheme, so that the aging time can be effectively reduced, the damage of long-time high temperature to a battery and the influence of large temperature difference on an SEI film are reduced, and the stability and completeness of the SEI film are ensured; secondly, because the temperature rising type stepped aging process is adopted, the reaction speed and the gas production rate are different in each section of aging process, and the gas in the air bag can be prevented from permeating into the battery cell when the pressure is too low and the gas production rate is too high by gradually increasing the holding pressure in the aging process; thirdly, the aging pressure is gradually increased, so that the damage of the traditional continuous high pressure to the battery can be avoided; in general, through the matching of the formation-aging process parameters, the aging-formation time can be shortened, the integrity and stability of the SEI film can be improved, and the cycle performance and safety performance of the battery can be improved.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (4)

1. A formation and aging combined method for a soft package lithium ion battery is characterized by comprising the following steps:
segmenting the soft package lithium ion battery cell to be formed into sections to obtain the soft package lithium ion battery cell after formation; the segmenting specifically comprises:
according to the first formation temperature a 1: 20-25 ℃, first formation pressure B1: 0.05-0.15 MPa and a first current C1: 0.01-0.05C, and charging the soft package lithium ion battery cell to a first cut-off voltage U1: 3.20-3.45V;
according to the second formation temperature a 2: 26-35 ℃ and a second formation pressure B2: 0.16-0.30 MPa and a second current C2: 0.06-0.1C, charging the soft package lithium ion cell to a second cut-off voltage U2 by constant current: 3.60-3.80V;
according to a third formation temperature a 3: 36-45 ℃ and a third formation pressure B3: 0.30-0.70 MPa and a third current C3: 0.1-0.3C, charging the soft package lithium ion battery cell to a third cut-off voltage U3: 3.95-4.10V;
performing segmented aging on the soft package lithium ion battery cell after formation to obtain an aged soft package lithium ion battery cell; the segment aging specifically comprises:
according to a first aging temperature D1: 25-30 ℃ and a first aging pressure E1: 0.2-0.4 MPa, first aging time T1: carrying out first-stage aging on the soft package lithium ion battery cell for 12-16 hours;
according to the second aging temperature D2: 31-40 ℃ and the second aging pressure E2: 0.4-0.6 MPa, second aging time T2: carrying out second-stage aging on the soft package lithium ion battery cell for 16-24 hours;
according to the third aging temperature D3: 41-45 ℃ and the third aging pressure E3: 0.6-1.0 MPa, and a third aging time T3: and (4) carrying out third-stage aging on the soft package lithium ion battery cell for 12-24 hours.
2. The formation and aging combined method according to claim 1, wherein before the soft package lithium ion battery cell to be formed is segmented into the soft package lithium ion battery cell after formation, the formation and aging combined method further comprises:
and standing the liquid-injected soft package lithium ion battery cell for 24-48 hours at normal temperature and normal pressure to obtain the soft package lithium ion battery cell to be formed.
3. The formation and aging combined method according to claim 2, wherein after the soft-package lithium ion battery cell after liquid injection is left to stand at normal temperature and normal pressure for 24-48 hours to obtain the soft-package lithium ion battery cell to be formed, the formation and aging combined method further comprises, before the soft-package lithium ion battery cell to be formed is segmented to obtain the soft-package lithium ion battery cell after formation:
and clamping the soft package lithium ion battery cell to be formed to the first formation pressure B1, and standing for 4-8 hours.
4. A soft package lithium ion battery comprises a soft package lithium ion battery cell, and is characterized in that the soft package lithium ion battery cell is formed and aged by the formation and aging combined method according to any one of claims 1 to 3.
CN202010993215.3A 2020-09-21 2020-09-21 Formation and aging combined method of soft package lithium ion battery and soft package lithium ion battery Active CN112086692B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010993215.3A CN112086692B (en) 2020-09-21 2020-09-21 Formation and aging combined method of soft package lithium ion battery and soft package lithium ion battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010993215.3A CN112086692B (en) 2020-09-21 2020-09-21 Formation and aging combined method of soft package lithium ion battery and soft package lithium ion battery

Publications (2)

Publication Number Publication Date
CN112086692A CN112086692A (en) 2020-12-15
CN112086692B true CN112086692B (en) 2022-02-11

Family

ID=73738570

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010993215.3A Active CN112086692B (en) 2020-09-21 2020-09-21 Formation and aging combined method of soft package lithium ion battery and soft package lithium ion battery

Country Status (1)

Country Link
CN (1) CN112086692B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112736287A (en) * 2020-12-25 2021-04-30 惠州亿纬创能电池有限公司 Electrode wetting method, electrode and battery
CN112927951B (en) * 2021-03-04 2022-09-23 富华德电子(东莞)有限公司 Formation method of soft package lithium-carbon capacitor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102891341A (en) * 2011-07-21 2013-01-23 湖北骆驼特种电源有限公司 Lithium iron phosphate battery formation and aging method
CN106684426A (en) * 2016-12-29 2017-05-17 多氟多（焦作）新能源科技有限公司 Formation method of softly-packed lithium ion battery
CN106654428B (en) * 2017-02-27 2019-04-12 多氟多新能源科技有限公司 A kind of manganate lithium ion battery chemical synthesizing method
CN108232285B (en) * 2017-12-30 2019-03-22 骆驼集团新能源电池有限公司 A kind of high magnification lithium titanate battery and preparation method thereof
CN109713360A (en) * 2018-12-28 2019-05-03 蜂巢能源科技有限公司 Energy storage lithium ion battery and its electrolyte and chemical conversion-aging method
CN110323481A (en) * 2019-04-29 2019-10-11 宜宾茂泰业科技股份有限公司 A kind of hot pressing chemical synthesizing method of high magnification soft-package battery

Also Published As

Publication number Publication date
CN112086692A (en) 2020-12-15

Similar Documents

Publication Publication Date Title
CN111883866B (en) Lithium ion battery formation process and lithium ion battery obtained by same
CN106997960B (en) Formation and capacity grading method for lithium ion battery
CN112086692B (en) Formation and aging combined method of soft package lithium ion battery and soft package lithium ion battery
CN109659625B (en) Electrolyte infiltration method of soft package lithium ion battery
CN110323481A (en) A kind of hot pressing chemical synthesizing method of high magnification soft-package battery
CN111769332B (en) Formation method of pre-lithium battery and pre-lithiation lithium ion battery
CN111564674A (en) Soft package lithium battery core formation process
CN101783424A (en) Method for pre-charging lithium ion battery
CN109841915B (en) Formation method of lithium ion battery with high storage performance
CN110994037A (en) Full-voltage formation method and equipment for flexible package lithium ion battery
CN110797597B (en) Constant-voltage step charging method for lithium ion battery
CN109148991B (en) formation method of long-life flexible package battery
CN112510265B (en) One-step formation hot-pressing method for improving cycle performance of soft package lithium ion battery
CN111934019A (en) Rapid formation method of power soft-package polymer lithium ion battery
CN111540958A (en) Preparation method of lithium manganate battery
CN107579301B (en) Formation process of lithium iron phosphate power battery
CN110518301B (en) Soft package lithium ion battery formation method
CN110034336B (en) Battery formation method for forming stable SEI film
CN111446504A (en) Rapid formation and grading method for soft package battery using high-voltage electrolyte
CN109841914B (en) Pre-charging method of ternary soft package lithium ion power battery
CN114284562A (en) Method for opening formation of lithium ion battery and lithium ion battery
CN107528093A (en) A kind of aging technique of lithium iron phosphate dynamic battery
CN106876813A (en) A kind of method for pre-charging lithium ion batteries
CN101783425A (en) Method for pre-charging lithium ion batteries
CN101783426A (en) Pre-charging method of lithium ion battery with cobalt acid lithium as positive active material

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant