CN112599876A - Regulation and control method for prolonging service life of lithium ion battery pack - Google Patents
Regulation and control method for prolonging service life of lithium ion battery pack Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 18
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 24
- 238000007600 charging Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 14
- 238000010277 constant-current charging Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 238000012827 research and development Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 4
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of lithium ion batteries, in particular to a regulation and control method for prolonging the service life of a lithium ion battery pack. The method comprises the following steps: s1, carrying out capacity calibration on a battery pack to be tested; s2, determining a charging cut-off voltage according to the capacity calibration charging capacity data, wherein the discharging cut-off voltage is (2.5N) V; and S3, carrying out charge-discharge cycle life test according to the determined charge cut-off voltage and the determined discharge cut-off voltage. The invention does not need to develop the interior of the battery, can prolong the service life of the product only by regulating and controlling the voltage parameters in the using process of a mature product, and greatly reduces the research and development cost. The invention is feasible, simple and easy to understand, can be operated and executed, does not need additional investment, and can realize the purpose of prolonging the service life of the battery only by setting parameters in operating equipment.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a regulation and control method for prolonging the service life of a lithium ion battery pack.
Background
The lithium iron phosphate battery has the advantages of high energy density, low cost, long service life, high safety, environmental friendliness and the like, and is widely applied to a plurality of new energy fields such as digital electronics, communication base stations, electric motor coaches, buses and energy storage.
As for lithium ion batteries, the cycle life is an important index for evaluating the quality of the batteries, and in order to adapt to changeable market demands, industry people spend a great deal of time and experience everyday, and the cycle life of the batteries is continuously optimized and improved through material improvement, formula selection, process adjustment and the like.
In the market, most lithium ion battery packs are charged and discharged by using DOD (direction of charge) less than or equal to 80 percent in a circulating manner, and the conventional shallow charge and shallow discharge (10-90 percent SOC) battery is considered to have better circulation, so that the voltage of the battery pack is not processed, the charge cut-off voltage is 54.75V, and the discharge cut-off voltage is 37.50V.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a regulating method for prolonging the service life of a lithium ion battery pack.
The technical scheme for realizing the purpose of the invention is as follows: a regulation and control method for prolonging the service life of a lithium ion battery pack comprises the following steps:
s1, carrying out capacity calibration on the battery pack to be tested.
And S2, determining a charging cut-off voltage according to the capacity calibration charging capacity data, wherein the discharging cut-off voltage is (2.5N) V.
And S3, carrying out charge-discharge cycle life test according to the determined charge cut-off voltage and the determined discharge cut-off voltage.
Further, the S1 includes the following steps:
a. standing for 5 min.
b. Constant current discharging: discharge current I2Cut-off voltage (2.5 × N) V.
c. Standing for 30 min.
d. Constant-current constant-voltage charging: charging current I2Charge cutoff voltage (3.65 × N) V, and charge cutoff current 0.05C.
e. Standing for 30 min.
f. Constant current discharging: discharge current I2Cut-off voltage (2.5 × N) V.
Further, determination of the charge cut-off voltage: according to the d steps in the capacity calibration, the total charging capacity is Qtotal, and the voltage corresponding to the capacity when Qtotal is 80% is selected to be determined as the charging cut-off voltage V1。
Further, the charge-discharge cycle life test comprises the following steps:
1) standing for 30 min.
2) Constant current charging: charging current I2Charge cutoff voltage V1 V。
3) Standing for 30 min.
4) Constant current discharging: discharge current I2Cut-off voltage (2.5 × N) V.
5) Step 1) is started, and the circulation times are N times.
After the technical scheme is adopted, the invention has the following positive effects:
(1) the invention does not need to develop the interior of the battery, can prolong the service life of the product only by regulating and controlling the voltage parameters in the using process of a mature product, and greatly reduces the research and development cost.
(2) The invention is feasible, simple and easy to understand, can be operated and executed, does not need additional investment, and can realize the purpose of prolonging the service life of the battery only by setting parameters in operating equipment.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a graph of the cycle performance of examples (1-3);
FIG. 2 is a graph showing the cycle performance of comparative examples (1 to 3);
FIG. 3 is a graph showing the cycle performance of comparative examples (4 to 6).
Detailed Description
(examples 1 to 3)
Taking three groups of 15 strings of 4850 lithium iron phosphate battery packs as an example, when the battery state is 0% -80% SOC, the voltage regulation and control test is carried out, and the specific steps are as follows:
battery pack capacity calibration:
1) standing for 5 min; 2) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 3) standing for 30 min; 4) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 54.75V, and a charge cut-off current of 2.5A; 5) standing for 30 min; 6) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 7) standing for 30 min.
Battery pack charge cutoff voltage determination:
according to the total charging capacity Qtotal of the step 4) in the battery pack capacity calibration, selecting the voltage corresponding to the capacity when Qtotal is 80 percent as the charging cut-off voltage V1；
Determining a battery pack charge-discharge cycle system:
example 1:
1) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 51.47V, and a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 5) step 1) is initiated, and the number of cycles 1006.
Example 2:
2) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 51.58V, a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 5) step 1) is initiated, and the number of cycles 1006.
Example 3:
3) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 51.46V, a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 5) step 1) is initiated, and the number of cycles 1006.
Comparative examples 1 to 3:
taking three groups of 15 strings of 4850 lithium iron phosphate battery packs as an example, when the battery state is 20% -100% SOC, the voltage regulation and control test is carried out, and the specific steps are as follows:
battery pack capacity calibration:
1) standing for 5 min; 2) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 3) standing for 30 min; 4) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 54.75V, and a charge cut-off current of 2.5A; 5) standing for 30 min; 6) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 7) standing for 30 min.
Battery pack charge cutoff voltage determination:
according to the total discharge capacity Qtotal in the step 6) in the battery pack capacity calibration, selecting a voltage corresponding to the capacity when Qtotal is 80% as a charge cut-off voltage V2;
determining a battery pack charge-discharge cycle system:
comparative example 1:
1) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 54.75V, and a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 47.03V; 5) step 1) is initiated, and the number of cycles 1006.
Comparative example 2:
1) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 54.75V, and a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 46.94V; 5) step 1) is initiated, and the number of cycles 1006.
Comparative example 3:
1) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 54.75V, and a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 47.01V; 5) step 1) is initiated, and the number of cycles 1006.
Comparative examples 4 to 6:
taking three groups of 15 strings of 4850 lithium iron phosphate battery packs as an example, when the battery state is 0% -90% SOC, the voltage regulation and control test is carried out, and the specific steps are as follows:
battery pack capacity calibration:
1) standing for 5 min; 2) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 3) standing for 30 min; 4) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 54.75V, and a charge cut-off current of 2.5A; 5) standing for 30 min; 6) constant current discharging: discharge current 50A, cut-off voltage 37.5V; 7) standing for 30 min.
Determining the charge and discharge cut-off voltage of the battery pack:
according to the total charging capacity Qtotal of the step 4) in the battery pack capacity calibration, selecting the voltage corresponding to the capacity when Qtotal is 90 percent as the charging cut-off voltage V2(ii) a Step 6), selecting the voltage corresponding to the total discharge capacity Qtotal of 90 percent, and determining the voltage as the discharge cut-off voltage V3；
Determining a battery pack charge-discharge cycle system:
comparative example 4:
1) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 51.82V, and a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 45.96V; 5) step 1) is initiated, and the number of cycles 1006.
Comparative example 5:
1) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 51.71V, and a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 45.98V; 5) step 1) is initiated, and the number of cycles 1006.
Comparative example 6:
1) standing for 30 min; 2) constant-current constant-voltage charging: a charge current of 50A, a charge cut-off voltage of 51.62V, and a charge cut-off current of 2.5A; 3) standing for 30 min; 4) constant current discharging: discharge current 50A, cut-off voltage 46.28V; 5) step 1) is initiated, and the number of cycles 1006.
The experimental results are as follows:
it can be known through the comparison, this technical scheme is showing the cycle life who has promoted the group battery, and it need not spend a large amount of efforts to research and develop electric core, greatly reduced the development cost of battery.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A regulation and control method for prolonging the service life of a lithium ion battery pack is characterized in that: the method comprises the following steps:
s1, carrying out capacity calibration on a battery pack to be tested;
s2, determining a charging cut-off voltage according to the capacity calibration charging capacity data, wherein the discharging cut-off voltage is (2.5N) V;
and S3, carrying out charge-discharge cycle life test according to the determined charge cut-off voltage and the determined discharge cut-off voltage.
2. The regulation and control method for prolonging the service life of a lithium ion battery pack according to claim 1, wherein the regulation and control method comprises the following steps: the S1 includes the steps of:
a. standing for 5 min;
b. constant current discharging: discharge current I2Cutoff voltage (2.5 × N) V;
c. standing for 30 min;
d. constant-current constant-voltage charging: charging current I2Charge cutoff voltage (3.65 × N) V, charge cutoff current 0.05C;
e. standing for 30 min;
f. constant current discharging: discharge current I2Cut-off voltage (2.5 × N) V.
3. The regulation and control method for prolonging the service life of a lithium ion battery pack according to claim 2, wherein the regulation and control method comprises the following steps: determination of charge cutoff voltage: according to the d steps in the capacity calibration, the total charging capacity is Qtotal, and the voltage corresponding to the capacity when Qtotal is 80% is selected to be determined as the charging cut-off voltage V1。
4. The regulation and control method for prolonging the service life of a lithium ion battery pack according to claim 1, wherein the regulation and control method comprises the following steps: the charge-discharge cycle life test comprises the following steps:
1) standing for 30 min;
2) constant current charging: charging current I2Charge cutoff voltage V1 V；
3) Standing for 30 min;
4) constant current discharging: discharge current I2Cutoff voltage (2.5 × N) V;
5) step 1) is started, and the circulation times are N times.
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