CN112114266A - Method for realizing battery screening and grouping in one step - Google Patents

Method for realizing battery screening and grouping in one step Download PDF

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Publication number
CN112114266A
CN112114266A CN202010994123.7A CN202010994123A CN112114266A CN 112114266 A CN112114266 A CN 112114266A CN 202010994123 A CN202010994123 A CN 202010994123A CN 112114266 A CN112114266 A CN 112114266A
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battery
voltage
capacity
realizing
time
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Inventor
刘艳侠
李蒙
张若涛
赵冲冲
张治博
张涛
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Institute of Process Engineering of CAS
Zhengzhou Institute of Emerging Industrial Technology
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Institute of Process Engineering of CAS
Zhengzhou Institute of Emerging Industrial Technology
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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
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
    • 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]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides a method for realizing battery screening and grouping in one step, which comprises the following steps: 1) selecting a certain system of battery, charging and discharging for the first time for one week, and recording the charging and discharging capacity C, C' of the battery; 2) the battery is discharged to a certain voltage V after being pre-charged to full charge1Recording the charging capacity C0And V1(ii) a 3) The battery is kept stand and the voltage V after depolarization is recorded2And time T1(ii) a 4) Standing the battery, and recording the voltage V after the voltage drop of the battery3And time T2(ii) a 5) The grades are divided by the battery capacity, the depolarization degree and the self-discharge voltage drop. The invention realizes a method for realizing battery screening and matching in one step, can greatly shorten the production period of products, reduce the production cost, accurately pick out abnormal batteries, realize battery matching, optimize the existing battery screening and matching process and realize new system battery industryThe process is determined, and a novel idea is provided.

Description

Method for realizing battery screening and grouping in one step
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method for realizing battery screening and grouping in one step.
Background
With the improvement of the national standard of living, the requirements of people on the living environment are increasing day by day, and the traditional pollution sources of nickel-hydrogen, nickel-chromium and lead-acid batteries are gradually banned, and are replaced by new energy lithium batteries which are more energy-saving and more environment-friendly. The increase of the demand of the lithium ion battery promotes the continuous increase and expansion of battery factories and accelerates the competition of the industry. The screening and matching are to eliminate abnormal batteries, and batteries with similar performance are matched for use, so that the screening and matching method is an important link in the production of lithium batteries and is related to the safety and consistency of the use of the batteries. Different enterprises, the technology has great difference, and many production periods are longer, and the cost is higher. Therefore, the screening and matching are used as one of the core technologies of the lithium battery enterprises, and the technology development capital investment is large.
The traditional screening and grouping link usually comprises a plurality of processes, such as pre-charging, storage, OCV test, capacity grading and the like, and finally, the grouping is realized according to two or three items of data, such as capacity, static internal resistance, discharging platform time, charging and discharging efficiency or open-circuit voltage and the like, of the batteries. The production period of the process is long, the operation is troublesome, and the product cost is undoubtedly and greatly increased.
Disclosure of Invention
The invention provides a method for realizing battery screening and grouping in one step, which is characterized in that the battery capacity is calculated through the charging capacity and the first effect, and the depolarization degree K of the battery is calculated through the voltage rebound after the discharging1Calculating the self-discharge voltage drop K of the battery according to the voltage drop before and after laying2Value, in combination with battery capacity, degree of depolarization K1And self-discharge voltage drop K2And (5) screening and grouping the batteries.
The technical scheme for realizing the invention is as follows:
the method for realizing battery screening grouping in one step comprises the following steps:
1) determining the first effect of a battery of a certain system, selecting a fresh battery after aging of the certain system, charging the battery to full charge for the first time, discharging the battery to cut-off voltage, circulating for one week, recording the charging and discharging capacity C, C ', calculating the first effect value I = C'/C100% of the battery of the system, and calculating the subsequent capacity of the battery to adopt the value before the system and the process are not changed;
2) the battery is discharged to a certain voltage V after being pre-charged to full charge1The discharge current is 0.1-10C, preferably 1-5C, and the charge capacity C is recorded when the discharge current is discharged to a voltage preferably above the plateau voltage, preferably 3.8-4.0V0And V1Calculating the battery capacity C1=C0*I；
3) Standing the battery for 0.1-4 h, preferably 0-2 h in an environment at 25-55 ℃, and recording the voltage V after depolarization2And time T1Calculating the change of voltage over time K1=（V2-V1）；
4) Continuously placing the battery in an environment with the temperature of 25-55 ℃ for standing for 4-24 h, preferably 12-24 h, and recording the voltage V after the voltage drop of the battery3And time T2Calculating the change of voltage over time K2=（V3-V2）/（T2-T1）；
5) Grading the battery by battery capacity, depolarization degree and self-discharge voltage drop;
the battery classification adopts battery discharge capacity C' and depolarization degree K1=（V2-V1) And self-discharge voltage drop K2=（V3-V2）/（T2-T1）。
The invention has the beneficial effects that:
the invention calculates the battery capacity through the charging capacity and the first effect in the pre-charging process, and calculates the depolarization degree K of the battery through the voltage rebound after the discharging1Calculating the self-discharge voltage drop K of the battery through the voltage drops before and after laying2Value, maximumCapacity of post-bonded cell, degree of depolarization K1And self-discharge voltage drop K2And (5) screening and grouping the batteries. The invention is scientific and reasonable, is simple to operate, is suitable for batteries of different systems, and provides a brand-new idea for optimizing the existing battery screening and grouping process and determining the new system battery process.
The invention realizes a method for realizing battery screening and matching in one step, can greatly shorten the production period of products, reduce the production cost, accurately pick out abnormal batteries, realize battery matching, and provide a brand-new idea for optimizing the existing battery screening and matching process and determining the new system battery process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of process selection.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
In the embodiment, the negative electrode of the battery adopts high-rate graphite, and the positive electrode adopts small-particle lithium cobaltate, so that the 16Ah high-rate unmanned aerial vehicle battery is prepared. Selecting a certain amount of fresh batteries after the system is aged, carrying out charge-discharge circulation on the batteries for one week for the first time, recording the charge-discharge capacity C, C ' of the batteries, and calculating the first effective value I = C '/C100% = (C1 '/C1 + C2 '/C2 + C10 '/C10)/10% = 100% =87.03% of the batteries of the system.
Figure DEST_PATH_IMAGE002
Example 1
Discharging 0.1C to 3.8V after the battery is precharged to full charge, recording the charging capacity C0=18.880Ah, calculating the battery capacity C1=C0I =18.880, 87.03% =16.431Ah, the cell is placed in an environment at 25 ℃ and stands for 0.1h, and voltage V after depolarization is recorded2=3.940V and time T1=0.1h, calculating the change of voltage over time K1=（V2-V1) =3.940-3.8=0.14V, and is kept standing at 25 deg.C for 24h, and voltage V after voltage drop is recorded3= 3.937V and time T2=24.1h, calculating the change of voltage over time K2=（V3-V2）/（T2-T1) =0.125mV/h, based finally on C1、K1And K2Sorting and grouping the batteries, and rejecting K1And K2And (4) classifying the abnormal products with the difference of more than 5% into a grade for every 50mAh difference of the residual battery capacity, and realizing the screening and grouping of the batteries.
Example 2
Discharging 5C to 3.8V after the battery is precharged to full charge, and recording the charging capacity C0Calculating the battery capacity C1=C0Standing the cell at 55 deg.C for 0.1h, and recording voltage V after depolarization2And time T1Calculating the change of voltage over time K1=（V2-V1) Continuously standing for 24h in an environment of 55 ℃, and recording the voltage V after voltage drop3And time T2Calculating the change of voltage over time K2=（V3-V2）/（T2-T1) Finally according to C1、K1And K2Sorting and grouping the batteries, and rejecting K1And K2And (4) classifying the abnormal products with the difference of more than 5% into a grade for every 50mAh difference of the residual battery capacity, and realizing the screening and grouping of the batteries.
Example 3
Discharging the battery to 4.1V at 0.1C after the battery is precharged to full charge, and recording the charging capacity C0Calculating the battery capacity C1=C0Standing the cell at 25 deg.C for 0.1h, and recording voltage V after depolarization2And time T1Calculating the change of voltage over time K1=（V2-V1) Continuously standing for 12h in an environment of 25 ℃, and recording the voltage V after voltage drop3And time T2Calculating the change of voltage over time K2=（V3-V2）/（T2-T1) Finally according to C1、K1And K2Sorting and grouping the batteries, and rejecting K1And K2And (4) classifying the abnormal products with the difference of more than 5% into a grade for every 50mAh difference of the residual battery capacity, and realizing the screening and grouping of the batteries.
Example 4
Discharging 0.1C to 3.9V after the battery is precharged to full charge, recording the charging capacity C0Calculating the battery capacity C1=C0Standing the cell in an environment of 25 ℃ for 4h, and recording the voltage V after depolarization2And time T1Calculating the change of voltage over time K1=（V2-V1) Continuously standing for 4h in an environment of 55 ℃, and recording the voltage V after voltage drop3And time T2Calculating the change of voltage over time K2=（V3-V2）/（T2-T1) Finally according to C1、K1And K2Sorting and grouping the batteries, and rejecting K1And K2And (4) classifying the abnormal products with the difference of more than 5% into a grade for every 50mAh difference of the residual battery capacity, and realizing the screening and grouping of the batteries.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. The method for realizing battery screening grouping in one step is characterized by comprising the following steps of:
1) selecting a certain system of battery, charging and discharging for the first time for one week, and recording the charging and discharging capacity C, C' of the battery;
2) the battery is discharged to a certain voltage V after being pre-charged to full charge1Recording the charging capacity C0And V1；
3) The battery is kept stand and the voltage V after depolarization is recorded2And time T1；
4) Standing the battery, and recording the voltage V after the voltage drop of the battery3And time T2；
5) The grades are divided by the battery capacity, the depolarization degree and the self-discharge voltage drop.
2. The method for realizing the battery sieve grouping according to the claim 1, wherein: calculating the first efficiency I = C '/C100% of the system battery by using C, C' in step 1).
3. The method for realizing the battery sieve grouping according to the claim 1, wherein: and 2) discharging after the battery is precharged to full charge by adopting a current of 0.1-10C.
4. The method for realizing the battery sieve grouping according to the claim 1, wherein: voltage V in step 2)13.6V to 4.1V, using a charge capacity C0And V1Calculating the battery capacity C1=C0*I。
5. The method for realizing the battery sieve grouping according to the claim 1, wherein: in the step 3), the battery standing temperature is 25-55 ℃, the battery stands for 0-4 h, and the voltage V is utilized1And a voltage V2Calculating the voltage variation K1=（V2-V1）。
6. The method for realizing the battery sieve grouping according to the claim 1, wherein: in the step 4), the battery standing temperature is 25-55 ℃, the battery stands for 4-24 h, and the voltage V is utilized3And time T2Calculating the change of voltage over time K2=（V3-V2）/（T2-T1）。
7. The method for realizing the battery sieve grouping according to the claim 1, wherein: grading the battery in the step 5) by adopting battery discharge capacity C' and depolarization degree K1=（V2-V1) And self-discharge voltage drop K2=（V3-V2）/（T2-T1）。
CN202010994123.7A 2020-09-21 2020-09-21 Method for realizing battery screening and grouping in one step Pending CN112114266A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113125977A (en) * 2021-02-23 2021-07-16 惠州市恒泰科技股份有限公司 Lithium ion battery and self-discharge screening method thereof
CN113655383A (en) * 2021-08-06 2021-11-16 广州小鹏汽车科技有限公司 Battery parameter updating method, battery management platform and vehicle

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CN108287312A (en) * 2017-12-22 2018-07-17 广州市香港科大霍英东研究院 A kind of method for separating, system and the device of retired battery
CN109332218A (en) * 2018-09-30 2019-02-15 江西安驰新能源科技有限公司 A kind of detection of lithium ion battery self discharge and combo technique
CN111029668A (en) * 2019-11-25 2020-04-17 江西恒动新能源有限公司 Matching method of lithium ion power batteries

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
WO2016091116A1 (en) * 2014-12-09 2016-06-16 江苏华东锂电技术研究院有限公司 Lithium ion battery screening method
CN107020251A (en) * 2017-03-23 2017-08-08 苏州协鑫集成储能科技有限公司 The screening technique of battery and battery pack
CN108172918A (en) * 2017-12-11 2018-06-15 合肥国轩高科动力能源有限公司 A kind of quick forming and capacity dividing method of lithium battery
CN108287312A (en) * 2017-12-22 2018-07-17 广州市香港科大霍英东研究院 A kind of method for separating, system and the device of retired battery
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113125977A (en) * 2021-02-23 2021-07-16 惠州市恒泰科技股份有限公司 Lithium ion battery and self-discharge screening method thereof
CN113655383A (en) * 2021-08-06 2021-11-16 广州小鹏汽车科技有限公司 Battery parameter updating method, battery management platform and vehicle

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