CN110571490A - Formation method of lithium ion battery - Google Patents
Formation method of lithium ion battery Download PDFInfo
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- CN110571490A CN110571490A CN201910977995.XA CN201910977995A CN110571490A CN 110571490 A CN110571490 A CN 110571490A CN 201910977995 A CN201910977995 A CN 201910977995A CN 110571490 A CN110571490 A CN 110571490A
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 28
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 16
- 238000007600 charging Methods 0.000 claims description 35
- 238000010277 constant-current charging Methods 0.000 claims description 17
- 230000004913 activation Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 description 8
- 238000010278 pulse charging Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229910011328 LiNi0.6Co0.2Mn0.2O2 Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000011356 non-aqueous organic solvent Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
Classifications
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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
-
- 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
- H01M10/443—Methods for charging or discharging in response to temperature
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
the invention provides a formation method of a lithium ion battery, which is used for detecting parameters of the battery at the initial stage of formation, selecting different formation modes according to different parameters of the battery, improving the finished product rate of the battery and avoiding factors with unsatisfactory formation effect caused by individual difference of the battery.
Description
Technical Field
the invention relates to the technical field of lithium ion batteries, in particular to a formation method of a lithium ion battery.
background
the lithium ion battery has the advantages of high energy density, no memory effect, environmental protection and the like, so that the lithium ion battery becomes a preferred energy source for power automobiles. Meanwhile, the formation process of the lithium ion battery is an important process in the production of the lithium ion battery, and during formation, a solvent and lithium salt in an electrolyte can generate an SEI interface film on the surface of an electrode, and the SEI interface film can prevent side reactions of the solvent and an active material, so that the service life of the battery is prolonged. The quality of the lithium ion battery directly affects the characteristics of the battery in various aspects such as high and low capacity, high and low internal resistance, long service life and the like. In the prior art, there are various processes for forming lithium ion batteries, but due to the difference that is difficult to avoid in the production processes, even if the internal states of batteries in the same batch are different, if the same formation process is adopted, a small number of batteries are not suitable for the process, so that the yield is reduced, and therefore, a formation process capable of improving the formation yield is required to be developed.
disclosure of Invention
Aiming at the problems, the invention provides a formation method of a lithium ion battery, which is used for detecting parameters of the battery at the initial stage of formation, selecting different formation modes according to different parameters of the battery, improving the finished product rate of the battery and avoiding factors with unsatisfactory formation effect caused by individual difference of the battery.
The specific scheme is as follows:
A formation method of a lithium ion battery is an opening formation method, and specifically comprises the following steps:
1) adjusting the temperature of the battery to a first preset value, and carrying out constant current charging to a first preset voltage by using a first preset current;
2) measuring the temperature of the battery, and if the temperature of the battery exceeds a second preset value, performing step 3; if not, performing step 6;
3) adjusting the voltage of the battery to a discharge cut-off voltage, and then performing small-current constant-current charge-discharge circulation between the discharge cut-off voltage and an activation voltage, wherein the activation voltage is lower than the discharge cut-off voltage;
4) adjusting the temperature of the battery to a first preset value, and carrying out constant current charging to the first preset voltage by the first preset current;
5) Measuring the temperature of the battery, and if the temperature of the battery exceeds a second preset value and the frequency of the battery for performing the step 3 is lower than a preset value, performing the step 3; if not, performing step 6;
6) Performing constant current charging to a second preset voltage by using a second preset current, wherein the second preset current is higher than the first preset current;
7) charging at a second preset voltage constant voltage until the charging current is lower than the charging cut-off current;
8) vacuumizing and standing;
9) conducting a high current pulse charge-discharge cycle between a second predetermined voltage and a first predetermined voltage under conditions below atmospheric pressure; charging at constant voltage by using the charging cut-off voltage until the charging current is lower than the charging cut-off current;
10) performing constant-current charge-discharge circulation between the charge cut-off voltage and the discharge cut-off voltage under the condition of being lower than the atmospheric pressure, and standing;
11) and taking out the battery and sealing.
further, the discharge cut-off voltage in the step 3 is 2.7-2.8V, the activation voltage is 0.02-0.03V lower than the discharge cut-off voltage, and the small current is 0.001-0.01C.
Further, in the step 9, the pulse current of the large-current pulse charge-discharge cycle is 2-10C, the pulse time is 10-60s, the pulse interval is 5-10s, and the vacuum degree is reduced in a stepwise manner along with the increase of the cycle number; it is further preferred that the vacuum level decreases by 0.1 times atmospheric pressure with each cycle between the second predetermined voltage and the first predetermined voltage until the pulse charge-discharge cycle is stopped by decreasing to 0.1 times atmospheric pressure or less.
further, the current in the step 10 is 0.5-1C, and the vacuum degree is reduced in a step-like manner along with the increase of the cycle number; it is further preferred that the vacuum level decreases by 0.1 times atmospheric pressure with each cycle between the second predetermined voltage and the first predetermined voltage until the pulse charge-discharge cycle is stopped by decreasing to 0.1 times atmospheric pressure or less.
Further, the first preset value is 0-25 ℃, and the second preset value is 5-40 ℃.
further, the first preset current is 0.1-0.5C, the second preset current is 0.2-1C, and the first preset voltage is 3.3-3.5V; the second predetermined voltage is 3.9-4.1V.
Further, the charge cut-off voltage is 4.2-4.3V.
Further, the charge cut-off current is 0.01-0.02C.
the invention has the following beneficial effects:
1) Different formation modes are selected according to different battery parameters, so that the finished product rate of the battery is improved, the factors that the formation effect is not ideal due to individual difference of the battery are avoided, and the finished product rate of the formation is greatly improved;
2) In the initial formation stage, the internal resistance information of the battery is simply and effectively obtained by measuring the temperature of the battery, and the activation formation is carried out on the battery with larger internal resistance; the threshold value of the battery temperature can be set according to the condition of the battery, and is preferably 5-40 ℃;
3) The lithium ion is formed under the activation voltage, so that lithium ions deposited inside and on the surface of the negative electrode can be fully desorbed, and the internal resistance of the battery is reduced; thereby avoiding the reduction of the yield of the battery caused by the overhigh temperature of the single battery in the subsequent formation process;
4) the high-current pulse formation under the first preset voltage and the second preset voltage can form a stable SEI film, and meanwhile, the second preset voltage is lower than the charge cut-off voltage, so that the decomposition of high voltage generated by polarization of the electrolyte in the high-current pulse formation process is avoided;
5) the vacuum degree of the formation is adjusted in a stepped manner, so that the vacuum degree is slowly reduced along with the formation, the gas is discharged at a constant speed in the formation, and the yield is prevented from being reduced due to the fact that the gas is discharged too fast;
6) through the formation mode of the invention, the yield of the battery is greatly improved, and meanwhile, the battery has good charge and discharge performance and cycle life.
Detailed Description
the present invention will be described in more detail below with reference to specific examples, but the scope of the present invention is not limited to these examples.
the battery anode adopted by the invention is LiNi0.6Co0.2Mn0.2O2the negative electrode is 1:1 of natural graphite and artificial graphite; LiPF with electrolyte salt of 1M6The nonaqueous organic solvent is a mixed solvent of EMC and EC in a volume ratio of 1:2, and the additive is 3 mass% of VC. The charging equipment adopted by the invention is vacuum formation equipment provided by Wuhan torch power supply Limited.
Example 1
1) adjusting the temperature of the battery to 0 ℃, and carrying out constant current charging to 3.3V at 0.1 ℃;
2) Measuring the temperature of the battery, and if the temperature of the battery exceeds 5 ℃, performing a step 3; if not, performing step 6;
3) Regulating the voltage of the battery to 2.7V, and then performing 0.001C constant-current charge-discharge circulation for 5 times between 2.68 and 2.7V;
4) and repeating the step 1;
5) Measuring the temperature of the battery, and if the temperature of the battery exceeds 5 ℃ and the frequency of the battery for performing the step 3 is lower than 3 times, performing the step 3; if not, performing step 6;
6) performing constant current charging to 3.9V at 0.2C;
7) charging at a constant voltage of 3.9V until the charging current is lower than 0.01C;
8) Opening a vacuumizing device, vacuumizing to 0.1 time of atmospheric pressure, and standing for 2 hours;
9) Adjusting the pressure to 0.5 times atmospheric pressure, performing large-current pulse charging and discharging circulation, wherein the pulse current is 2C, the pulse time is 60s, the pulse interval is 10s, and the pressure in the vacuum device is adjusted to be reduced by 0.1 times atmospheric pressure once every circulation until the pressure is reduced to 0.1 times atmospheric pressure, and stopping the pulse charging and discharging circulation; charging at a constant voltage of 4.2V until the charging current is lower than 0.01C;
10) adjusting the pressure to 0.5 times atmospheric pressure, performing constant-current charge-discharge circulation at 0.5C between 2.7V and 4.2V, adjusting the pressure in the vacuum device to reduce by 0.1 times atmospheric pressure once per circulation, stopping charge-discharge circulation until the pressure is reduced to 0.1 times atmospheric pressure, and keeping the 0.1 times atmospheric pressure for standing for 2 hours;
11) and taking out the battery and sealing.
Example 2
1) adjusting the temperature of the battery to 25 ℃, and carrying out constant current charging to 3.5V at 0.5 ℃;
2) Measuring the temperature of the battery, and if the temperature of the battery exceeds 40 ℃, performing the step 3; if not, performing step 6;
3) regulating the voltage of the battery to 2.8V, and then performing 0.01C constant-current charge-discharge circulation for 5 times between 2.78 and 2.8V;
4) and repeating the step 1;
5) Measuring the temperature of the battery, and if the temperature of the battery exceeds 40 ℃ and the frequency of the battery for performing the step 3 is lower than 3 times, performing the step 3; if not, performing step 6;
6) carrying out constant current charging to 4.1V at 1C;
7) Charging at a constant voltage of 4.1V until the charging current is lower than 0.01C;
8) opening a vacuumizing device, vacuumizing to 0.1 time of atmospheric pressure, and standing for 2 hours;
9) adjusting the pressure to 0.5 times atmospheric pressure, performing large-current pulse charging and discharging circulation, wherein the pulse current is 10C, the pulse time is 10s, the pulse interval is 5s, and the pressure in the vacuum device is adjusted to be reduced by 0.1 times atmospheric pressure once every circulation until the pressure is reduced to be below 0.1 times atmospheric pressure, and stopping the pulse charging and discharging circulation; charging at a constant voltage of 4.3V until the charging current is lower than 0.01C;
10) Adjusting the pressure to 0.5 times atmospheric pressure, performing 1C constant-current charge-discharge circulation between 2.8V and 4.3V, adjusting the pressure in the vacuum device to reduce by 0.1 times atmospheric pressure once per circulation, stopping charge-discharge circulation until the pressure is reduced to be below 0.1 times atmospheric pressure, and keeping 0.1 times atmospheric pressure for standing for 2 hours;
11) and taking out the battery and sealing.
example 3
1) adjusting the temperature of the battery to 10 ℃, and carrying out constant current charging to 3.4V at 0.2 ℃;
2) measuring the temperature of the battery, and if the temperature of the battery exceeds 15 ℃, performing a step 3; if not, performing step 6;
3) Regulating the voltage of the battery to 2.7V, and then performing 0.005C constant-current charge-discharge circulation for 5 times between 2.68 and 2.7V;
4) and repeating the step 1;
5) Measuring the temperature of the battery, and if the temperature of the battery exceeds 15 ℃ and the frequency of the battery for performing the step 3 is lower than 3 times, performing the step 3; if not, performing step 6;
6) performing constant current charging to 4.0V at 0.5C;
7) charging at a constant voltage of 4.0V until the charging current is lower than 0.01C;
8) Opening a vacuumizing device, vacuumizing to 0.1 time of atmospheric pressure, and standing for 2 hours;
9) adjusting the pressure to 0.5 times atmospheric pressure, performing large-current pulse charging and discharging circulation, wherein the pulse current is 5C, the pulse time is 20s, the pulse interval is 10s, and the pressure in the vacuum device is adjusted to be reduced by 0.1 times atmospheric pressure once every circulation until the pressure is reduced to be below 0.1 times atmospheric pressure, and stopping the pulse charging and discharging circulation; charging at a constant voltage of 4.2V until the charging current is lower than 0.01C;
10) Adjusting the pressure to 0.5 times atmospheric pressure, performing 1C constant-current charge-discharge circulation between 2.7V and 4.2V, adjusting the pressure in the vacuum device to reduce by 0.1 times atmospheric pressure once per circulation, stopping charge-discharge circulation until the pressure is reduced to be below 0.1 times atmospheric pressure, and keeping 0.1 times atmospheric pressure for standing for 2 hours;
11) And taking out the battery and sealing.
comparative example 1
1) performing constant current charging to 3.4V at 0.2C;
2) performing constant current charging to 4.0V at 0.5C;
3) Charging at a constant voltage of 4.0V until the charging current is lower than 0.01C;
4) opening a vacuumizing device, vacuumizing to 0.1 time of atmospheric pressure, and standing for 2 hours;
5) Adjusting the pressure to 0.5 times atmospheric pressure, performing large-current pulse charging and discharging circulation, wherein the pulse current is 5C, the pulse time is 20s, the pulse interval is 10s, and the pressure in the vacuum device is adjusted to be reduced by 0.1 times atmospheric pressure once every circulation until the pressure is reduced to be below 0.1 times atmospheric pressure, and stopping the pulse charging and discharging circulation; charging at a constant voltage of 4.2V until the charging current is lower than 0.01C;
6) Adjusting the pressure to 0.5 times atmospheric pressure, performing 1C constant-current charge-discharge circulation between 2.7V and 4.2V, adjusting the pressure in the vacuum device to reduce by 0.1 times atmospheric pressure once per circulation, stopping charge-discharge circulation until the pressure is reduced to be below 0.1 times atmospheric pressure, and keeping 0.1 times atmospheric pressure for standing for 2 hours;
7) And taking out the battery and sealing.
comparative example 2
1) Adjusting the temperature of the battery to 10 ℃, and carrying out constant current charging to 3.4V at 0.2 ℃;
2) measuring the temperature of the battery, and if the temperature of the battery exceeds 15 ℃, performing a step 3; if not, performing step 6;
3) regulating the voltage of the battery to 2.7V, and then performing 0.005C constant-current charge-discharge circulation for 5 times between 2.68 and 2.7V;
4) and repeating the step 1;
5) measuring the temperature of the battery, and if the temperature of the battery exceeds 15 ℃ and the frequency of the battery for performing the step 3 is lower than 3 times, performing the step 3; if not, performing step 6;
6) performing constant current charging to 4.0V at 0.5C;
7) Charging at a constant voltage of 4.0V until the charging current is lower than 0.01C;
8) opening a vacuumizing device, vacuumizing to 0.1 time of atmospheric pressure, and standing for 2 hours;
9) adjusting the pressure to 0.2 times atmospheric pressure, performing 1C constant-current charge-discharge circulation between 2.7V and 4.2V, adjusting the pressure in the vacuum device to reduce by 0.1 times atmospheric pressure once per circulation, stopping charge-discharge circulation until the pressure is reduced to be below 0.1 times atmospheric pressure, and keeping 0.1 times atmospheric pressure for standing for 2 hours;
10) and taking out the battery and sealing.
comparative example 3
1) performing constant current charging to 4.2V at 0.2C;
2) charging at a constant voltage of 4.2V until the charging current is lower than 0.01C;
3) adjusting the pressure to 0.2 times atmospheric pressure, performing 0.5C constant current charge-discharge circulation between 2.7V and 4.2V for 5 times, then performing 1C constant current charge-discharge circulation for 5 times, and standing for 2 hours;
4) and taking out the battery and sealing.
experiment and data
the charge and discharge cycles were performed on 1000 batteries according to the methods of examples 1 to 3 and comparative examples 1 to 3, respectively, the yield was calculated, then the charge and discharge cycles were performed on the obtained finished product at 1C for 200 times, the capacity retention rate was measured, and the average values obtained by the calculation are shown in the following table. As can be seen from the following table, the yield of the batteries obtained by the temperature screening method of the present invention (examples 1 to 3, comparative example 2) is significantly improved, and the yield is improved by 2.5 percentage points compared to the batteries without the temperature screening method. Through the large-current exhaust process, the capacity retention rate of the battery is also remarkably improved, and the capacity retention rate of the battery can also be improved by the stepped vacuum degree exhaust mode.
TABLE 1
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.
Claims (8)
1. a formation method of a lithium ion battery is an opening formation method, and specifically comprises the following steps:
1) Adjusting the temperature of the battery to a first preset value, and carrying out constant current charging to a first preset voltage by using a first preset current;
2) measuring the temperature of the battery, and if the temperature of the battery exceeds a second preset value, performing step 3; if not, performing step 6;
3) Adjusting the voltage of the battery to a discharge cut-off voltage, and then performing small-current constant-current charge-discharge circulation between the discharge cut-off voltage and an activation voltage, wherein the activation voltage is lower than the discharge cut-off voltage;
4) Adjusting the temperature of the battery to a first preset value, and carrying out constant current charging to the first preset voltage by the first preset current;
5) measuring the temperature of the battery, and if the temperature of the battery exceeds a second preset value and the frequency of the battery for performing the step 3 is lower than a preset value, performing the step 3; if not, performing step 6;
6) performing constant current charging to a second preset voltage by using a second preset current, wherein the second preset current is higher than the first preset current;
7) Charging at a second preset voltage constant voltage until the charging current is lower than the charging cut-off current;
8) vacuumizing and standing;
9) conducting a high current pulse charge-discharge cycle between a second predetermined voltage and a first predetermined voltage under conditions below atmospheric pressure; charging at constant voltage by using the charging cut-off voltage until the charging current is lower than the charging cut-off current;
10) Performing constant-current charge-discharge circulation between the charge cut-off voltage and the discharge cut-off voltage under the condition of being lower than the atmospheric pressure, and standing;
11) and taking out the battery and sealing.
2. the method of claim 1, wherein the discharge cut-off voltage in step 3 is 2.7-2.8V, the activation voltage is 0.02-0.03V lower than the discharge cut-off voltage, and the small current is 0.001-0.01C.
3. the method of the previous claim, in step 9, the pulse current of the high-current pulse charge-discharge cycle is 2-10C, the pulse time is 10-60s, the pulse interval is 5-10s, and the vacuum degree is reduced in a stepwise manner along with the increase of the cycle number; it is further preferred that the vacuum level decreases by 0.1 times atmospheric pressure with each cycle between the second predetermined voltage and the first predetermined voltage until the pulse charge-discharge cycle is stopped by decreasing to 0.1 times atmospheric pressure or less.
4. The method of the previous claim, wherein the current in step 10 is 0.5-1C, and the vacuum level decreases stepwise with increasing cycle number; it is further preferred that the vacuum level decreases by 0.1 times atmospheric pressure with each cycle between the second predetermined voltage and the first predetermined voltage until the pulse charge-discharge cycle is stopped by decreasing to 0.1 times atmospheric pressure or less.
5. The method of the preceding claim, wherein the first predetermined value is 0-25 ℃ and the second predetermined value is 5-40 ℃.
6. The method of the preceding claim, wherein the first predetermined current is 0.1-0.5C, the second predetermined current is 0.2-1C, and the first predetermined voltage is 3.3-3.5V; the second predetermined voltage is 3.9-4.1V.
7. The method of the preceding claim, wherein the charge cut-off voltage is 4.2-4.3V.
8. The method of the preceding claim, wherein the charge cutoff current is 0.01-0.02C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111193078A (en) * | 2020-01-07 | 2020-05-22 | 森克创能(天津)新能源科技有限公司 | Formation process of zinc-nickel battery |
| CN111276756A (en) * | 2020-02-19 | 2020-06-12 | 金妍 | Formation method of high-low temperature lithium ion battery |
| CN111342028A (en) * | 2020-03-20 | 2020-06-26 | 金妍 | Formation method of lithium ion battery with graphite-based cathode |
| CN111916837A (en) * | 2020-08-14 | 2020-11-10 | 苏州酷卡环保科技有限公司 | Formation method of nickel acid lithium battery |
| CN112151871A (en) * | 2020-09-28 | 2020-12-29 | 苏州酷卡环保科技有限公司 | Formation method of high-temperature lithium ion battery |
| CN112994147A (en) * | 2021-02-06 | 2021-06-18 | 苏州极闪控电信息技术有限公司 | Operation method of management system for street sharing mobile power supply |
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