CN113325318B - Lithium ion storage battery consistency screening method - Google Patents
Lithium ion storage battery consistency screening method Download PDFInfo
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- CN113325318B CN113325318B CN202110481280.2A CN202110481280A CN113325318B CN 113325318 B CN113325318 B CN 113325318B CN 202110481280 A CN202110481280 A CN 202110481280A CN 113325318 B CN113325318 B CN 113325318B
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to a lithium ion storage battery consistency screening method, which comprises the following steps: respectively charging the lithium ion storage batteries to be screened to specified voltages under a specific pressure intensity of 1; discharging the lithium ion storage battery for 30s at a specific pressure 1 by using a specific current I1, and recording a discharge final voltage V1; discharging the lithium ion storage battery for 5s at a specific pressure 1 by using a specific current I2, and recording a discharge final voltage V2; and calculating the direct current internal resistance R1 of the lithium ion storage battery. According to the invention, the resistance change of the lithium ion battery under different pressures is represented, so that the internal resistance change characteristic of the single battery under the state of the storage battery is accurately reflected, the actual use state is further met, and the consistency of the single battery in the storage battery is improved.
Description
Technical Field
The invention relates to a lithium ion storage battery consistency screening method, and belongs to the technical field of space lithium ion storage batteries.
Background
The lithium ion storage battery pack is generally formed by connecting a plurality of lithium ion storage battery monomers in series and parallel, and the service life of the storage battery pack is generally limited by the worst performance monomer in the storage battery pack, so that the consistency of the monomers in the storage battery pack has important influence on the performance of the storage battery pack. One of the specific key parameters of the single battery is characterized when the internal resistance of the lithium ion battery is measured.
At present, internal resistance is adopted to screen lithium ion storage batteries, the internal resistance of the storage batteries under a single state is mostly adopted, and after the lithium ion storage battery pack is assembled into a storage battery pack, the impedance characteristic of a storage battery monomer is slightly changed after external pressure changes, and the performance of the storage battery pack is also influenced by the change. The internal resistance in a single state cannot accurately reflect the characteristics of the product.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method for screening the consistency of the lithium ion storage batteries overcomes the defects of the prior art, accurately reflects the characteristics of the storage batteries in a use state and improves the consistency of monomers in the storage battery pack by representing the internal resistance change of the storage batteries under different external pressures.
The technical scheme of the invention is as follows:
a lithium ion storage battery consistency screening method comprises the following steps:
s1, respectively charging lithium ion storage batteries to be screened to specified voltages under specific pressure intensity of 1;
s2, discharging the lithium ion storage battery for 30S at a specific pressure intensity of 1 by using a specific current I1, and recording a final discharge voltage V1;
s3, discharging the lithium ion storage battery for 5S at a specific pressure intensity of 1 by using a specific current I2, and recording a final discharge voltage V2;
s4, calculating direct-current internal resistance R1 of the lithium ion storage battery;
s5, respectively charging the lithium ion storage batteries to be screened to specified voltages under the specific pressure intensity of 2;
s6, discharging the lithium ion storage battery for 30S at a specific pressure intensity of 2 by using a specific current I1, and recording a final discharge voltage V1;
s7, discharging the lithium ion storage battery for 5S at a specific pressure intensity of 2 by using a specific current I2, and recording a final discharge voltage V2;
s8, calculating direct current internal resistance R2 of the lithium ion storage battery;
s9, calculating a difference value between the R2 and the R1, and recording the difference value as delta R;
s10, carrying out statistical analysis on the delta R, and selecting the storage battery monomer within a certain tolerance range.
Further, in the step S1, the specific pressure 1 is 0.08MPa to 0.12MPa.
Further, in the step S1, the specified charging voltage of the battery cell is between 3.9V and 4.1V.
Further, the specific current I1 in the step S2 is 0.1C to 0.2C.
Further, the specific current I2 in the step S3 is 2C to 3C.
Further, the direct current internal resistance calculation formula in step S4 is:
further, in the step S5, the specific pressure 2 is 0.5MPa to 1MPa, and the specified charging voltage is the same as that in S1.
Further, in step S10, the Δ R of all monomers is statistically analyzed, and monomers within a specified standard deviation range (1 δ to 3 δ) are selected according to different use requirements.
Compared with the prior art, the invention has the beneficial effects that:
by representing the resistance change of the lithium ion battery under different pressures, the internal resistance change characteristic of the single battery under the state of the storage battery is accurately reflected, so that the practical use state is better met, and the consistency of the single battery in the storage battery is improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a graph of the discharge end voltage of 10% DOD cycles of 10000 times in the 8-cell composition battery pack according to the present invention.
Detailed Description
The invention is further illustrated by the following examples.
A lithium ion storage battery consistency screening method comprises the following steps:
s1, respectively charging lithium ion storage batteries to be screened to specified voltages under specific pressure intensity of 1; the specific pressure intensity 1 is between 0.08 and 0.12MPa, and the charge specified voltage of the storage battery monomer is between 3.9 and 4.1V.
S2, discharging the lithium ion storage battery for 30S at a specific pressure intensity of 1 by using a specific current I1, and recording a final discharge voltage V1; the specific current I1 is between 0.1 and 0.2C;
s3, discharging the lithium ion storage battery for 5S at a specific pressure intensity of 1 by using a specific current I2, and recording a final discharge voltage V2; the specific current I2 is between 2C and 3C;
s4, calculating direct-current internal resistance R1 of the lithium ion storage battery; the direct current internal resistance calculation formula is as follows:
s5, respectively charging the lithium ion storage batteries to be screened to specified voltages under the specific pressure intensity of 2; the specific pressure intensity 2 is 0.5 MPa-1 MPa, and the specified charging voltage is the same as that in the S1;
s6, discharging the lithium ion storage battery for 30S at a specific pressure intensity of 2 by using a specific current I1, and recording a final discharge voltage V1;
s7, discharging the lithium ion storage battery for 5S at a specific pressure intensity of 2 by using a specific current I2, and recording a final discharge voltage V2;
s8, calculating direct-current internal resistance R2 of the lithium ion storage battery;
s9, calculating a difference value between the R2 and the R1, and recording the difference value as delta R;
s10, carrying out statistical analysis on the delta R, selecting storage battery monomers within a certain tolerance range, carrying out statistical analysis on the delta R of all the monomers, and selecting the monomers within a specified standard deviation range (1 delta-3 delta) according to different use requirements.
Examples
A lithium ion battery consistency screening method is shown in figure 1 and comprises the following steps:
step 1, taking a 30Ah lithium ion storage battery, and charging the battery to 4.0V at 0.2C under the pressure of 0.1 MPa;
step 2, discharging the battery for 30s at 0.1C, and recording the final discharge voltage V1;
step 3, continuing discharging for 5s with 2C current, and recording the final discharge voltage V2;
step 4, calculating internal resistance R1 under the pressure of 0.1MPa according to a specified formula;
step 5, adjusting the external pressure to 0.6MPa, and charging to 4.0V at 0.2C;
step 6, discharging the battery for 30s at 0.1C, and recording the final discharge voltage V1;
step 7, continuing to discharge for 5s with 2C current, and recording the final discharge voltage V2;
step 8, calculating the internal resistance R2 under the pressure of 0.6MPa according to a specified formula;
9, calculating a difference value delta R between R2 and R1;
and step 10, carrying out statistical analysis on the delta R, and selecting the storage battery packs with similar variation values.
Table 1 shows the results of screening the lithium ion battery monomer by the method, and it can be seen from Table 1 that the internal resistance change of the monomer is mostly-0.04 m omega-0.05 m omega, and the internal resistance change of other samples with a small amount exceeds the range.
It is preferable that the battery pack is composed of 8 battery cells whose internal resistance is changed to-0.04 m.OMEGA.to-0.05 m.OMEGA.FIG. 2 is a discharge terminal voltage curve of the battery pack in the process of performing 50% DOD charge and discharge for a long period of time, and the cell voltage curves are excellent in uniformity.
TABLE 1
By representing the resistance change of the lithium ion battery under different pressures, the internal resistance change characteristic of the single battery under the state of the storage battery is accurately reflected, so that the practical use state is better met, and the consistency of the single battery in the storage battery is improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (2)
1. A lithium ion storage battery consistency screening method is characterized by comprising the following steps:
s1, respectively charging the lithium ion storage batteries to be screened to specified voltages under a specific pressure intensity of 1;
s2, discharging the lithium ion storage battery for 30S at a specific pressure intensity of 1 by using a specific current I1, and recording a final discharge voltage V1;
s3, discharging the lithium ion storage battery for 5S at a specific pressure intensity of 1 by using a specific current I2, and recording a final discharge voltage V2;
s4, calculating direct-current internal resistance R1 of the lithium ion storage battery;
s5, respectively charging the lithium ion storage batteries to be screened to specified voltages under the specific pressure intensity of 2;
s6, discharging the lithium ion storage battery for 30S at a specific pressure intensity of 2 by using a specific current I1, and recording a final discharge voltage V1;
s7, discharging the lithium ion storage battery for 5S at a specific pressure intensity of 2 by using a specific current I2, and recording a final discharge voltage V2;
s8, calculating direct-current internal resistance R2 of the lithium ion storage battery;
s9, calculating a difference value between the R2 and the R1, and recording the difference value as delta R;
s10, carrying out statistical analysis on the delta R, and selecting a storage battery monomer within a certain tolerance range;
the specific pressure 1 is 0.08MPa to 0.12MPa;
the specific current I1 is 0.1C to 0.2C;
the specific current I2 is 2C to 3C;
the specific pressure 2 is 0.5MPa to 1MPa;
the specified voltage is between 3.9V and 4.1V.
2. The lithium ion storage battery consistency screening method according to claim 1, wherein the direct current internal resistance calculation formula in the step S4 is as follows: r = (V1-V2)/(I2-I1).
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