CN113851734A - Method for determining aging parameters of lithium ion battery - Google Patents
Method for determining aging parameters of lithium ion battery Download PDFInfo
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- CN113851734A CN113851734A CN202111115616.XA CN202111115616A CN113851734A CN 113851734 A CN113851734 A CN 113851734A CN 202111115616 A CN202111115616 A CN 202111115616A CN 113851734 A CN113851734 A CN 113851734A
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- voltage
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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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- 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
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- 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)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
Abstract
The invention provides a method for determining aging parameters of a lithium ion battery, which comprises the steps of charging a formed battery to a charging cut-off voltage; placing the battery in a temperature control box, increasing the temperature in sequence at room temperature by a preset temperature gradient, and measuring the change value of the open-circuit voltage of the battery before and after standing; when the change value of the open-circuit voltage is in a preset range, determining the temperature at the moment as the optimal aging temperature; adjusting the battery to be reduced from a charge cut-off voltage by a preset voltage gradient at an aging temperature, and measuring the change value of the open-circuit voltage of the battery before and after standing; when the variation value of the open-circuit voltage is lower than a preset range, determining that the voltage of the battery at the moment is at the optimal aging voltage; and aging for a preset time at the optimal aging temperature and the optimal aging voltage. The invention determines the optimal aging temperature interval and voltage interval, and the aging in the temperature interval and voltage interval can greatly improve the stability of the battery and has good cycle life.
Description
Technical Field
The invention relates to a method for determining aging parameters of a lithium ion battery.
Background
The aging process of the lithium ion battery is mainly to place the lithium ion battery in a high-temperature environment for standing, so that the stability of the battery is improved, the aging mechanism is generally to accelerate the permeation of electrolyte, the electrolyte can generate micro reaction on the surface of an electrode, and the stability of an interface layer on the surface of the electrode of the battery is improved, the aging temperature is generally determined by experience, and a confirmation method for determining the most appropriate aging temperature is not provided.
Disclosure of Invention
The invention provides a method for determining aging parameters of a lithium ion battery, which comprises the steps of charging the battery after 1) formation to a charging cut-off voltage; placing the battery in a temperature control box, increasing the battery in a preset temperature gradient from room temperature in sequence, standing the battery for a preset time in sequence at different gradient temperatures, and measuring the change value of the open-circuit voltage of the battery before and after standing; when the change value of the open-circuit voltage is in a preset range, determining the temperature at the moment as the optimal aging temperature; adjusting the charging cut-off voltage of the battery to be reduced by a preset voltage gradient at the aging temperature, standing the battery for a preset time at different gradient temperatures in sequence, and measuring the change value of the open-circuit voltage of the battery before and after standing; when the variation value of the open-circuit voltage is lower than a preset range, determining that the voltage of the battery at the moment is at the optimal aging voltage; and aging for a preset time at the optimal aging temperature and the optimal aging voltage. (ii) a The invention determines the optimal aging temperature interval and voltage interval, and the aging in the temperature interval and voltage interval can greatly improve the stability of the battery and has good cycle life. The specific scheme is as follows:
a method for determining aging parameters of a lithium ion battery comprises the following steps:
1) charging the battery after formation to a charging cut-off voltage;
2) placing the battery in a temperature control box, increasing the battery in a preset temperature gradient from room temperature in sequence, standing the battery for a preset time in sequence at different gradient temperatures, and measuring the change value of the open-circuit voltage of the battery before and after standing;
3) when the change value of the open-circuit voltage is within a preset range, determining the temperature at the moment as the optimal aging temperature;
4) adjusting the charging cut-off voltage of the battery to be reduced by a preset voltage gradient at the aging temperature, standing the battery for a preset time at different gradient temperatures in sequence, and measuring the change value of the open-circuit voltage of the battery before and after standing;
5) when the variation value of the open-circuit voltage is within a preset range, determining that the voltage of the battery at the moment is at the optimal aging voltage;
6) and aging for a preset time at the optimal aging temperature and the optimal aging voltage.
Further, the predetermined time in step 2 is 1 hour.
Further, the predetermined range in step 3 is 0.010-0.015V.
Further, the predetermined time in step 4 is 1 hour.
Further, the predetermined range of step 5 is 0.005-0.008V.
Further, the predetermined temperature gradient is 1-5 degrees celsius.
Further, the predetermined voltage gradient is 0.05-0.1V.
Further, aging in step 7 is performed for a predetermined time of 6 to 10 hours.
The invention has the following beneficial effects:
1) the inventors found that, when the battery is left standing at the charge cut-off voltage, the voltage drops as the temperature at which the battery is exposed rises, and the inventors found that, within a predetermined time, when the variation value of the open circuit voltage is within a predetermined range, the aging effect of the battery is good within the temperature range, when the temperature is too low, the aging time is required to be too long, and when the temperature is too high, the aging effect becomes poor;
2) further, the inventors found that the cell voltage of the battery slightly decreases during the standing process within a predetermined temperature range, and the aging effect of the battery is good when the variation value of the open-circuit voltage is within a predetermined range within a predetermined time, and the aging time is too long when the variation value is too low, and the aging effect becomes poor when the variation value is too high;
3) the invention determines the appropriate aging temperature and aging voltage of the lithium ion battery by a simple method, thereby greatly improving the stability of the battery and having good 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 smaller the temperature and voltage gradients, the more precise the temperature and voltage ranges obtained, but the more time it takes
Example 1
1) Charging the battery after formation to a charging cut-off voltage;
2) placing the battery in a temperature control box, increasing the battery in a gradient manner at 5 ℃ from room temperature in sequence, standing the battery for 1 hour in sequence at different gradient temperatures, and measuring the change value of the open-circuit voltage of the battery before and after standing;
3) when the variation value of the open-circuit voltage is within 0.010-0.015V, determining the temperature at the moment as the optimal aging temperature;
4) adjusting the charging cut-off voltage of the battery to be reduced by a preset voltage gradient of 0.1V at an aging temperature, standing the battery for 1 hour at different gradient temperatures in sequence, and measuring the change value of the open-circuit voltage of the battery before and after standing;
5) when the variation value of the open-circuit voltage is within 0.005-0.008V, determining that the voltage of the battery at the moment is at the optimal aging voltage;
6) and aging for 10 hours at the optimal aging temperature and the optimal aging voltage.
Example 2
1) Charging the battery after formation to a charging cut-off voltage;
2) placing the battery in a temperature control box, increasing the battery in a gradient manner at 3 ℃ from room temperature in sequence, standing the battery for 1 hour in sequence at different gradient temperatures, and measuring the change value of the open-circuit voltage of the battery before and after standing;
3) when the variation value of the open-circuit voltage is within 0.010-0.015V, determining the temperature at the moment as the optimal aging temperature;
4) adjusting the charging cut-off voltage of the battery to be reduced by a preset voltage gradient of 0.05V at the aging temperature, standing the battery for 1 hour at different gradient temperatures in sequence, and measuring the change value of the open-circuit voltage of the battery before and after standing;
5) when the variation value of the open-circuit voltage is within 0.005-0.008V, determining that the voltage of the battery at the moment is at the optimal aging voltage;
6) and aging for 10 hours at the optimal aging temperature and the optimal aging voltage.
Test and results
Testing lithium cobalt oxide ions according to the method of the embodiment 2, wherein the optimal aging temperature is 66 ℃ and the optimal aging voltage is 3.45V; aging the battery for 10 hours under the parameters, comparing the battery with the battery of a comparative example, and checking the aging effect, wherein the aging temperature of the comparative example 1 is 60 ℃, and the aging voltage is 3.2V; the aging temperature of comparative example 2 was 60 degrees celsius, and the aging voltage was 3.8V; the aging temperature of comparative example 3 was 70 degrees celsius, and the aging voltage was 3.2V; the aging temperature of comparative example 4 was 70 degrees centigrade, and the aging voltage was 3.8V. The batteries of example 2 and comparative examples 1 to 4 were subjected to constant current cycling at 0.5C for 400 times, and the cycle retention rates were measured.
TABLE 1
| Capacity retention (%) | |
| Example 2 | 98.2 |
| Comparative example 1 | 96.7 |
| Comparative example 2 | 97.2 |
| Comparative example 3 | 97.0 |
| Comparative example 4 | 96.9 |
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 method for determining aging parameters of a lithium ion battery comprises the following steps:
1) charging the battery after formation to a charging cut-off voltage;
2) placing the battery in a temperature control box, increasing the battery in a preset temperature gradient from room temperature in sequence, standing the battery for a preset time in sequence at different gradient temperatures, and measuring the change value of the open-circuit voltage of the battery before and after standing;
3) when the change value of the open-circuit voltage is within a preset range, determining the temperature at the moment as the optimal aging temperature;
4) adjusting the charging cut-off voltage of the battery to be reduced by a preset voltage gradient at the aging temperature, standing the battery for a preset time at different gradient temperatures in sequence, and measuring the change value of the open-circuit voltage of the battery before and after standing;
5) when the variation value of the open-circuit voltage is within a preset range, determining that the voltage of the battery at the moment is at the optimal aging voltage;
6) and aging for a preset time at the optimal aging temperature and the optimal aging voltage.
2. The method of the preceding claim, wherein the predetermined time in step 2 is 1 hour.
3. The method of claim 2, wherein the predetermined range in step 3 is 0.010-0.015V.
4. The method of claim, wherein the predetermined time in step 4 is 1 hour.
5. The method of claim 4, wherein the predetermined range of step 5 is 0.005-0.008V.
6. The method of the preceding claim, wherein the predetermined temperature gradient is 1-5 degrees celsius.
7. The method of the preceding claim, wherein the predetermined voltage gradient is 0.05-0.1V.
8. The method according to the preceding claim, wherein the aging in step 7 is carried out for a predetermined time of 6-10 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111115616.XA CN113851734A (en) | 2021-09-23 | 2021-09-23 | Method for determining aging parameters of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111115616.XA CN113851734A (en) | 2021-09-23 | 2021-09-23 | Method for determining aging parameters of lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113851734A true CN113851734A (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111115616.XA Withdrawn CN113851734A (en) | 2021-09-23 | 2021-09-23 | Method for determining aging parameters of lithium ion battery |
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| CN (1) | CN113851734A (en) |
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2021
- 2021-09-23 CN CN202111115616.XA patent/CN113851734A/en not_active Withdrawn
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Application publication date: 20211228 |
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