CN116736159A - Rapid consistency screening method for echelon utilization of retired power battery - Google Patents
Rapid consistency screening method for echelon utilization of retired power battery Download PDFInfo
- Publication number
- CN116736159A CN116736159A CN202310751735.7A CN202310751735A CN116736159A CN 116736159 A CN116736159 A CN 116736159A CN 202310751735 A CN202310751735 A CN 202310751735A CN 116736159 A CN116736159 A CN 116736159A
- Authority
- CN
- China
- Prior art keywords
- battery
- test
- dcr
- grouping
- cells
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012216 screening Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000012360 testing method Methods 0.000 claims abstract description 59
- 238000007599 discharging Methods 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims description 2
- 238000005215 recombination Methods 0.000 claims description 2
- 230000006798 recombination Effects 0.000 claims description 2
- 238000012163 sequencing technique Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 12
- 238000007600 charging Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/38—Collecting or arranging articles in groups
-
- 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
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Abstract
The invention discloses a rapid consistency screening method for the echelon utilization of retired power batteries, which has the advantages of realizing rapid, efficient and accurate consistency screening and grouping, greatly saving the test cost of battery echelon utilization enterprises, improving the production beat, reducing the equipment and manpower investment and improving the economic benefit of the enterprises.
Description
[ field of technology ]
The invention relates to the technical field of echelon utilization of retired power batteries, in particular to a rapid consistency screening method for the echelon utilization of retired power batteries.
[ background Art ]
The power battery of the electric vehicle is coming out of service, and most of the secondary batteries which are out of service can be reused, for example, the secondary batteries are used as storage batteries of electric two-wheelers, small-sized energy storage batteries and the like. The resource utilization rate is greatly improved, and the waste is reduced; can also generate higher economic benefit; meanwhile, the environmental pollution is reduced, the carbon emission is reduced, the demand pressure of society on mineral resources is slowed down, and sustainable development is promoted.
There have been related studies, for example, chinese patent application 201810037646.5, a screening method for the cascade utilization of retired power battery packs, the process of which comprises the steps of: pre-detection, room temperature capacity detection, multiplying power detection, internal resistance detection and voltage detection; disassembling retired power battery packs which do not meet gradient utilization into power battery modules, and then carrying out the following treatment: appearance inspection, capacity detection, multiplying power detection, internal resistance detection and voltage detection; finally, carrying out echelon utilization on the retired power battery pack and the power battery module after screening; compared with the prior art, the invention is based on the fact that the capacity, the internal resistance, the power and the voltage are four factors for reflecting the performance of the battery core, the sensitivity of the four factors to the performance of the battery core is screened from large to small, the consistency of screening is greatly improved, the invention mainly adopts the national standard for testing, the compatibility of the screening method is improved, the battery pack and the battery module are respectively screened, the field of echelon utilization is increased, and the universality is strong.
Secondary utilization of retired power cells involves secondary grouping problems where the same cell pack has a pronounced "barrel effect", i.e., the overall performance of the cell pack depends on the cell in the cell pack that has the worst performance. In the practical situation, the SOH of the battery cells without the battery pack is obviously different due to different use conditions, so that consistency screening and grouping are required before secondary grouping, the overall discharging and safety performance of the battery pack are ensured, and the gradient utilization benefit of the battery cells in the battery pack is improved.
At present, enterprises are utilized for consistency screening of retired power batteries in a echelon manner, a series of tests such as full capacity test, electrochemical impedance test and internal resistance test are generally adopted, so that the test time is long, and more equipment resources are occupied.
[ invention ]
Aiming at the testing problem of the existing large-batch retired power batteries, the invention provides a rapid consistency screening method for the echelon utilization of the retired power batteries, which can realize rapid, efficient and accurate consistency screening and grouping, and only needs a small amount of sampling for 1 round of charging and discharging for each batch of battery cells, and the testing and screening process is carried out, so that the testing and screening time of the battery cells is compressed to be within 2 hours, and meanwhile, the testing and screening of capacity, alternating current impedance and high current direct current impedance are considered, the accuracy and the efficiency are both considered, the testing cost of the enterprise for the echelon utilization of the batteries is greatly saved, the production beat is improved, the investment of equipment and manpower is reduced, and the economic benefit of the enterprise is improved.
The aim of the invention is achieved by the following technical scheme:
a rapid consistency screening method for echelon utilization of retired power batteries comprises the following steps:
1) Grouping according to battery pack sources, grouping the battery cells disassembled from each battery pack into a group, and reading the outgoing capacity information of the battery cells;
2) Sampling the grouped battery cells in the step 1), performing capacity test, judging whether the batch of battery cells can be utilized in a echelon according to a test result, and judging conditions are as follows: taking an average value of the capacity of the battery cells in the sampling test, and utilizing the average value in a echelon when the average value is larger than the echelon product specification value;
3) Judging qualified battery cells after the capacity test in the step 2), testing Open Circuit Voltage (OCV) and alternating current internal resistance (IMP) of each battery in a group, and recording test results;
4) Secondary screening and grouping the battery cells tested in the step 3) according to alternating current internal resistance (IMP) and Open Circuit Voltage (OCV) gradients;
the method for screening according to IMP comprises the following steps: summarizing IMP data of all battery cells, and calculating average value by using Excel 'MEAN' functionStandard deviation sigma is calculated using the "STDEVP" function, specification line is set to +.>Will->The battery cell of (N=1-4) is unqualified and is not used in a gradient manner;
5) Performing instantaneous heavy current discharge test on the cells grouped in the step 4) to obtain test data of each cell;
6) Processing the data tested in the step 5), and calculating the direct current internal resistance (DCR) of each cell in batches, wherein the direct current internal resistance (DCR) is tested in the following way: discharging for 10-30 seconds at 0.05-0.2C, then increasing current instantaneously until discharging for 12-18 seconds at 1-10C, and ending the discharging;
the data processing method comprises the following steps: v before discharging large current 0 Instantaneous current I and voltage V of 2S before heavy current discharge is finished 1 Calculating DCR, if 0.2C is discharged for 20 seconds and then 10C is discharged for 12 seconds, then 0.2C is discharged for 20S voltage value=v 0 Voltage of 10C discharge for 10 th second=v 1 I=10c, the DCR is calculated by: dcr= (V 0 —V 1 )/I；
7) Grouping again according to the calculated result of the step 6) according to the direct current internal resistance (DCR), determining the combination of echelon recombination cells, and judging the consistency;
the method for grouping again according to the direct current internal resistance (DCR) comprises the following steps: sequencing the battery cells according to the DC internal resistance (DCR) of the battery cells from small to large by using EXCEL, regrouping the battery cells with the DC internal resistance (DCR) value close to that of the battery cells according to the sequence number;
the consistency judgment method for each group of battery cells comprises the following steps: the EXCEL is used for automatically calculating the range delta DCR of the direct current internal resistance (DCR) in the four cell groups, the D/C is judged according to the delta DCR, the D/C is qualified when the D/C is smaller than the specification value, and the delta DCR specification can be 5/C-40/C m omega according to the actual conditions of the cells.
In the invention, the following components are added:
the sources described in step 1) are suitable for various material systems and packaging forms of power batteries, and the material systems include, but are not limited to, ternary materials, lithium iron phosphate and nickel hydrogen batteries; packaging forms include, but are not limited to, square, soft pack, cylinder, etc.
The capacity test in the step 2) adopts a simple random sampling method, and each battery pack extracts more than or equal to 1 battery cell to test the full capacity.
The capacity test described in the step 2) has a charge-discharge current of 0.05C-1C.
The voltage gradient was 5mV-30mV according to the Open Circuit Voltage (OCV) grouping described in step 4).
Compared with the prior art, the invention has the following advantages:
1. according to the rapid consistency screening method for the cascade utilization of the retired power battery, the difference between the capacity and the internal resistance of the battery is amplified by utilizing the high-current discharge energy of different power batteries, the rapid consistency screening of the retired power battery before the cascade utilization is realized, and the consistency screening of the retired power battery is realized by the steps of disassembling and grouping, capacity testing, OCV and IMP grouping and DCR grouping under high current.
2. Compared with the traditional full-capacity test, the rapid consistency screening method for the echelon utilization of the retired power batteries can realize the accurate and rapid consistency screening and grouping of the retired power batteries, can greatly save the test cost of the echelon utilization enterprises of the batteries, improves the production beat, reduces the equipment and manpower investment and improves the economic benefit of the enterprises.
[ description of the drawings ]
FIG. 1 is a process flow diagram of a method for gradient utilization rapid consistency screening of retired power cells according to the present invention.
[ detailed description ] of the invention
The following describes the invention in more detail with reference to examples.
Example 1:
as shown in FIG. 1, the method for screening the rapid consistency of the echelon utilization of the retired power battery takes a retired ternary lithium ion power battery pack of a certain department 1P108S/227Ah as an example, wherein the package form is square, and the manufacturing of the echelon product is 1P4S/200Ah energy storage battery;
a rapid consistency screening method for echelon utilization of retired power batteries comprises the following steps:
1) The battery pack is disassembled and grouped, 108 battery cells in the same battery pack are grouped into a group, and the group numbers are given according to the battery pack numbers;
2) The capacity sampling test is carried out, 5 cells in 108 cells are extracted to test the full capacity, 1C constant current charge and discharge is carried out until the voltage is cut off, then constant voltage charge is carried out until the current is lower than 0.05C, the results are respectively 208.1, 207.8, 210.3, 212.8 and 206.3Ah, the average value is 209.1Ah, the capacity is judged to be more than 200Ah, the requirement of echelon utilization is met, and the next grouping can be carried out;
3) OCV and IMP detection, the set of 108 cells were tested for OCV and IMP;
4) IMP screening and specification settingThe battery cells are all in a qualified range;
5) The OCV groups 108 electric cores are arranged according to the order of the small OCV from the large OCV, the voltage value 3.615V of the electric core N1 with the smallest OCV is a gradient according to 20mV, the gradient 1 is 3.615-3.635V, the gradient 2 is 3.635V-3.655V, 68 electric cores are in the gradient 1, and 40 electric cores are in the gradient 2; thus, the cells are again divided into 2 groups according to OCV, group 1 being X1-X68 and group 2 being X69-X108;
6) The large-current DCR test is carried out on 68 battery cores of the group 1 and 40 battery cores of the group 2 respectively, wherein the test flow is 40A discharge for 10 seconds, and then 400A current discharge is carried out for 12 seconds;
7) Calculating the cell DCR, and taking data: 40A discharge 10 th second cell voltage V 0 400A discharge voltage V for 10 seconds 1 According to the formula (V 0 –V 1 ) Calculating DCR by/400;
8) Grouping again according to DCR, firstly sorting the two groups of electric cores from small to large according to DCR in the second group, and changing the electric core of the group 1 into N1-N68 after the electric core of the group 2 into N69-N108; according to the mode that N1, N2, N3 and N4 are the next-stage combinations and N5, N6, N7 and N8 are the next-stage combinations, every four new next-stage combinations are formed;
9) And (3) DCR judgment, namely, the EXCEL is used for automatically calculating the extremely poor DCR in the four cell groups, and if the extremely poor DCR is smaller than 0.1mΩ, the consistency of the cell groups is good, and the cell groups can be regrouped.
Example 2
The battery pack is derived from a power battery of a lithium iron phosphate system of certain department 1P128S/37Ah, the packaging form is square, and each battery is provided with a gradient utilization module of 1P5S/30 Ah;
a rapid consistency screening method for echelon utilization of retired power batteries comprises the following steps:
1) Grouping according to battery pack sources, grouping the battery cells disassembled from each battery pack into a group, and reading the outgoing capacity information of the battery cells;
2) Randomly extracting 5 cells from 128 cells for capacity test, charging and discharging the 1C constant current until the voltage is cut off, and charging the 1C constant current until the current is lower than 0.05C; the results are respectively 30.8, 31.1, 31.6, 31.4 and 31.0, the average value is 31.2Ah, the judgment capacity is more than 30Ah, the requirement of echelon utilization is met, and the next grouping can be carried out;
3) OCV and IMP detection, the set of 128 cells were tested for OCV and IMP;
4) IMP screening and specification setting3 electric cores are unqualified, and the rest electric cores are all in a qualified range, so that the unqualified electric cores are scrapped;
5) The OCV groups, the rest 125 electric cores are ordered from small to large according to the OCV, a gradient is formed according to 30mV, the voltage value of the electric core N1 with the smallest OCV is 3.205V, the gradient 1 is 3.205-3.235V, the gradient 2 is 3.235V-3.265V, 55 electric cores are in the gradient 1, and 70 electric cores are in the gradient 2; thus, the cells are again divided into 2 groups according to OCV, group 1 being X1-X55 and group 2 being X56-X125;
6) The large current DCR test is respectively carried out on 55 battery cores of the group 1 and 70 battery cores of the group 2, the test flow is 10A discharge for 10 seconds, then 200A current discharge is 12 seconds
7) Calculating the cell DCR, and taking data: 10A discharge 10 th second cell voltage V 0 200A discharge voltage V of 10 th second 1 According to the formula (V 0 –V 1 ) Calculating DCR according to the ratio of/200;
8) Grouping again according to DCR, firstly sorting the two groups of electric cores from small to large according to DCR in the second group, and changing the electric core of the group 1 into N1-N55 after the electric core of the group 2 into N56-N125; according to the mode that N1, N2, N3, N4 and N5 are the next-stage combinations and N6, N7, N8, N9 and N10 are the next-stage combinations, every 5 forms a new next-stage combination;
9) And (3) DCR judgment, namely, the EXCEL is used for automatically calculating the extremely poor DCR in the four cell groups, and if the extremely poor DCR is smaller than 0.3mΩ, the consistency of the cell groups is good, and the cell groups can be regrouped.
Example 3:
900 power batteries of the retired ternary material system are packaged in a cylindrical form, and a gradient utilization module of 2P 15S/540V 5Ah is manufactured;
a rapid consistency screening method for echelon utilization of retired power batteries comprises the following steps:
1) Grouping according to battery pack sources, grouping the battery cells disassembled from each battery pack, and reading the factory capacity information of the battery cells to be 3Ah;
2) 200 cells are randomly extracted from 3000 cells for capacity test, 1C constant current charge and discharge is carried out until the voltage is cut off, and then constant voltage charge is carried out until the current is lower than 0.05C; the average value is 2.82Ah, and the capacity of all the battery cores is more than 2.5Ah, so that the requirement of echelon utilization is met, and the next step of grouping can be performed;
3) OCV and IMP detection, the group of 3000 cells were tested for OCV and IMP;
4) IMP screening and specification settingThe 60 battery cells are unqualified, the rest battery cells are all in a qualified range, and the unqualified battery cells are scrapped;
5) The rest 840 electric cores are arranged in groups according to the OCV from small to large, the voltage value of an electric core N1 with the smallest OCV is 3.592V according to the gradient of 20mV, the gradient 1 is 3.592-3.612V, the gradient 2 is 3.612V-3.632V, the gradient 3 is 3.632-3.652V, 480 electric cores are in the gradient 1, 180 electric cores are in the gradient 2, and 180 electric cores are in the gradient 3; thus, the cells are again divided into 2 groups according to OCV, group 1 being X1-X480, group 2 being X481-X660, group 3 being X661-X840;
6) The large current DCR test is respectively carried out on the battery cores of the group 1, the group 2 and the group 3, the test flow is that 0.5A discharges for 10 seconds, and then 15A discharges for 12 seconds
7) Calculating the cell DCR, and taking data: 10A discharge 10 th second cell voltage V 0 15A discharge voltage V of 10 th second 1 According to the formula (V 0 –V 1 ) Calculating DCR according to the ratio of/200;
8) Grouping again according to DCR, firstly sorting the two groups of electric cores from small to large according to DCR in the second group, re-sorting the group 1 electric cores into N1-N480, changing the group 2 electric cores into N481-N660, and setting the group 3 as N661-N840; according to the mode that N1-N30 are the next-stage combination and N31 and N60 are the next-stage combination, every 30 new next-stage combinations are formed;
9) And (3) DCR judgment, namely, the EXCEL is used for automatically calculating the extremely poor DCR in the 30 cell groups, and if the extremely poor DCR is smaller than 1mΩ, the consistency of the cell groups is good, and the cell groups can be rebuilt.
Comparative test
Comparative example 1:
referring to the invention patent publication number CN114833097a, the method comprises: firstly, screening out batteries with bad appearance and liquid leakage, and then screening out the batteries which are excessively discharged in the using process by utilizing a voltmeter; constant-current charging is carried out on the retired battery to cut-off voltage, and then the current change of the retired battery in a constant-voltage charging stage is analyzed; starting discharge test on the retired battery, dividing the discharge process into nine stages, screening and analyzing the internal resistance and the dynamic process of the retired battery when one stage is completed, screening out the retired battery which meets the condition of a first preset value for direct monomer use, and entering the next stage when the retired battery does not meet the condition; and for the retired batteries screened in all stages, the retired batteries with consistency meeting the second preset value condition are regrouped and classified into module application occasions.
The results show that:
the batteries in the embodiment 1 are screened and grouped according to the invention patent with publication number CN114833097A, each battery cell needs to be subjected to 9 rounds of charge and discharge tests, the total test duration is more than 10 hours, a large amount of measurement resources and manpower are occupied, and each round of charge and discharge needs to be screened once, and the total screening times are more than 10 times.
In example 1, the batch of cells only needs a small amount of sampling to perform 1 round of charging and discharging, and other testing and screening processes are added, the testing and screening time of the cells is compressed to be less than 2 hours, and meanwhile, capacity, alternating current impedance and high-current direct current impedance testing and screening are considered, so that accuracy and efficiency are both achieved.
Comparative example 2:
referring to the invention patent with publication number CN113369176A, the method comprises S1, preselecting qualified echelon cells according to a preselection rule; s2, carrying out complete charge-discharge circulation on each qualified echelon cell by adopting a set current, and supplementing electricity to the set value of each echelon cell according to the actual discharge capacity C; s3, waiting for a first set time after the electricity compensation is finished, measuring the open circuit voltage OCV1 and the alternating current internal resistance R of each echelon cell, transferring the echelon cell into a storage area, and measuring the open circuit voltage OCV2 of each echelon cell after waiting for a second set time; s4, recording the discharge capacity, the charge constant current ratio, the energy efficiency, the charge average voltage and the discharge average voltage of each echelon cell; s5, calculating a k value, wherein k= (OCV 2-OCV 1)/t; s6, sorting the data according to the set standard after finishing.
The results show that:
the batteries in example 1 were screened and grouped according to the invention patent publication number CN113369176a, all cells were required to be tested for full capacity, a lot of measurement resources and manpower were occupied, and the self-discharge value K of the battery was required to be detected, and the whole process exceeded 50 hours.
In example 1, the batch of cells only needs a small amount of sampling to perform 1 round of charging and discharging, and other testing and screening processes are added, the testing and screening time of the cells is compressed to be less than 2 hours, and meanwhile, capacity, alternating current impedance and high-current direct current impedance testing and screening are considered, so that accuracy and efficiency are both achieved.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and changes can be made by those skilled in the art without departing from the inventive concept herein.
Claims (5)
1. A rapid consistency screening method for echelon utilization of retired power batteries is characterized in that: the method comprises the following steps:
1) Grouping according to battery pack sources, grouping the battery cells disassembled from each battery pack into a group, and reading the outgoing capacity information of the battery cells;
2) Sampling the grouped battery cells in the step 1), performing capacity test, judging whether the batch of battery cells can be utilized in a echelon according to a test result, and judging conditions are as follows: taking an average value of the capacity of the battery cells in the sampling test, and utilizing the average value in a echelon when the average value is larger than the echelon product specification value;
3) Judging qualified battery cells after the capacity test in the step 2), testing the open-circuit voltage and the alternating-current internal resistance of each battery in a group, and recording the test result;
4) Secondary screening and grouping the battery cells after the test in the step 3) according to the alternating current internal resistance and the open-circuit voltage gradient;
the method for screening according to IMP comprises the following steps: summarizing IMP data of all battery cells, and calculating average value by using Excel 'MEAN' functionStandard deviation sigma is calculated using the "STDEVP" function, specification line is set to +.>Will->The battery cell of (N=1-4) is unqualified and is not used in a gradient manner;
5) Performing instantaneous heavy current discharge test on the cells grouped in the step 4) to obtain test data of each cell;
6) Processing the data tested in the step 5), and calculating the direct current internal resistance of each cell in batches, wherein the direct current internal resistance test mode is as follows: discharging for 10-30 seconds at 0.05-0.2C, then increasing current instantaneously until discharging for 12-18 seconds at 1-10C, and ending the discharging;
the data processing method comprises the following steps: taking a large currentV before discharge 0 Instantaneous current I and voltage V of 2S before heavy current discharge is finished 1 Calculating DCR, if 0.2C is discharged for 20 seconds and then 10C is discharged for 12 seconds, then 0.2C is discharged for 20S voltage value=v 0 Voltage of 10C discharge for 10 th second=v 1 I=10c, the DCR is calculated by: dcr= (V 0 —V 1 )/I；
7) Grouping again according to the direct current internal resistance according to the calculation result of the step 6), determining the combination of echelon recombination cells, and judging the consistency;
the method for grouping again according to the DC internal resistance comprises the following steps: sequencing the direct current internal resistances of the electric cores from small to large by using EXCEL, re-grouping the electric cores with the direct current internal resistances close to each other according to the sequence number, and grouping the electric cores again;
the consistency judgment method for each group of battery cells comprises the following steps: and (3) automatically calculating the range delta DCR of the direct current internal resistances in the four cell groups by using EXCEL, judging according to the delta DCR, and setting the delta DCR specification to be 5/C-40/CmΩ according to the actual conditions of the cells if the range delta DCR is smaller than the specification value.
2. The retired power battery echelon utilization rapid consistency screening method according to claim 1, wherein the method comprises the following steps: the sources described in step 1) are suitable for various material systems and packaging forms of power batteries, and the material systems include, but are not limited to, ternary materials, lithium iron phosphate and nickel hydrogen batteries; packaging forms include, but are not limited to, square, soft pack, cylindrical.
3. The retired power battery echelon utilization rapid consistency screening method according to claim 1, wherein the method comprises the following steps: the capacity test in the step 2) adopts a simple random sampling method, and each battery pack extracts more than or equal to 1 battery cell to test the full capacity.
4. The retired power battery echelon utilization rapid consistency screening method according to claim 1, wherein the method comprises the following steps: the capacity test described in the step 2) has a charge-discharge current of 0.05C-1C.
5. The retired power battery echelon utilization rapid consistency screening method according to claim 1, wherein the method comprises the following steps: the voltage gradient was 5mV-30mV according to the open circuit voltage grouping described in step 4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310751735.7A CN116736159A (en) | 2023-06-25 | 2023-06-25 | Rapid consistency screening method for echelon utilization of retired power battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310751735.7A CN116736159A (en) | 2023-06-25 | 2023-06-25 | Rapid consistency screening method for echelon utilization of retired power battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116736159A true CN116736159A (en) | 2023-09-12 |
Family
ID=87909524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310751735.7A Pending CN116736159A (en) | 2023-06-25 | 2023-06-25 | Rapid consistency screening method for echelon utilization of retired power battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116736159A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117644062A (en) * | 2024-01-30 | 2024-03-05 | 江苏华友能源科技有限公司 | Rapid sorting method for echelon utilization power batteries |
-
2023
- 2023-06-25 CN CN202310751735.7A patent/CN116736159A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117644062A (en) * | 2024-01-30 | 2024-03-05 | 江苏华友能源科技有限公司 | Rapid sorting method for echelon utilization power batteries |
| CN117644062B (en) * | 2024-01-30 | 2024-04-05 | 江苏华友能源科技有限公司 | Rapid sorting method for echelon utilization power batteries |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106125001B (en) | The fast evaluation method of the retired battery module actual capacity of electric car | |
| CN109031145B (en) | Series-parallel battery pack model considering inconsistency and implementation method | |
| CN113369176B (en) | Sorting method and system for recycling retired batteries | |
| CN110797591B (en) | Rapid sorting method for lithium power echelon cell recombination and lithium power echelon recombination battery | |
| CN107732337B (en) | Sorting method for retired battery modules | |
| CN108490366B (en) | Rapid assessment method for state of health of electric automobile retired battery module | |
| CN107377422B (en) | A kind of method for separating of single battery | |
| CN107362989B (en) | A kind of method for separating of lithium-ion-power cell | |
| CN103346358A (en) | Grouping method of lead-acid battery | |
| CN113369287B (en) | Sorting method and system for recycling retired battery modules | |
| CN110031771A (en) | A method of description battery consistency | |
| CN103487758B (en) | A kind of lithium ion battery grouping method | |
| CN111029668A (en) | Matching method of lithium ion power batteries | |
| CN112186278B (en) | Lithium ion battery matching method | |
| CN109759354A (en) | One kind retracting battery and shunts screening technique | |
| CN116736159A (en) | Rapid consistency screening method for echelon utilization of retired power battery | |
| CN107422271A (en) | A kind of lithium ion battery self discharge method of testing | |
| CN115602949A (en) | Screening method for gradient use of waste batteries | |
| CN114720899A (en) | Retired battery echelon utilization and sorting method and system, electronic equipment and storage medium | |
| CN108767340A (en) | The group technology that lithium ion battery echelon utilizes | |
| CN115121507A (en) | Low-test-cost retired power battery sorting method | |
| CN110187291B (en) | Lithium ion battery self-discharge rapid screening device and screening method based on direct-current impedance | |
| CN111136033A (en) | Screening method for consistency of lithium ion batteries | |
| CN114798502B (en) | Classification grouping method, system and production line for gradient utilization batteries | |
| CN107225104B (en) | A kind of method for separating of battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |