CN105738830A - Cascade utilization analyzing method for lithium-ion power batteries - Google Patents
Cascade utilization analyzing method for lithium-ion power batteries Download PDFInfo
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- CN105738830A CN105738830A CN201610229866.9A CN201610229866A CN105738830A CN 105738830 A CN105738830 A CN 105738830A CN 201610229866 A CN201610229866 A CN 201610229866A CN 105738830 A CN105738830 A CN 105738830A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 18
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000011156 evaluation Methods 0.000 claims abstract description 61
- 238000012360 testing method Methods 0.000 claims description 75
- 238000012216 screening Methods 0.000 claims description 22
- 238000004458 analytical method Methods 0.000 claims description 10
- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 206010016766 flatulence Diseases 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a cascade utilization analyzing method for lithium-ion power batteries. The influence of temperature and working conditions on sorting of lithium-ion power batteries is taken into consideration. Under a certain temperature condition, the discharge evaluation on lithium-ion power batteries is conducted, and actual available capacity and internal resistance under certain conditions are evaluated, and the lithium-ion power batteries are subjected to reasonable cascade sorting according to the actual available capacity, internal resistance and other parameters, so that the consistency of reused lithium-ion power batteries is ensured. The resource utilization of waste power batteries is maximized.
Description
Technical field
The present invention relates to a kind of applying waste lithium ionic electrokinetic cell is carried out echelon screening in case be repeated utilize analysis method.
Background technology
Along with the progressively industrialization of electric automobile, the yield of electric powered motor lithium ion battery will be greatly improved, and thing followed problem is, waste and old power lithium-ion battery this how to reclaim and to process.Containing metal material and electrolyte such as lead, nickel, cobalt, lithiums in power lithium-ion battery used for electric vehicle, once scrapped batteries can not effectively be recycled, not only cause the waste of resource, the pollution of environment is also particularly acute.
Utilized by echelon, be possible not only to allow power accumulator performance be fully played, be conducive to energy-saving and emission-reduction, it is also possible to alleviate a large amount of power accumulator and enter the pressure that recovery stage brings to recovery operation.But present stage is for the screening of waste and old electrokinetic cell, still without clear and definite definition and method.How these also to have the battery of most of capacity reasonably reuses is that one very valuable and the research of meaning.So battery is carried out echelon utilization, first have to the characteristic of automobile-used superseded lithium-ion-power cell is studied.But prior art exists following technical problem: from electric motor car, eliminate the electrokinetic cell got off, health status is also inconsistent, must strictly screen, eliminate inconsistent with major part battery small part problem battery, only by reasonably screening, secondary utilizes and just can give full play to its value.
Summary of the invention
It is an object of the invention to provide the screening packet that lithium-ion-power cell echelon is utilized and a kind of effective method is provided, the method reasonable estimation available capacity of cell, and according to this, they are reassembled into new power battery pack to be applied to different occasions.It is possible not only to make full use of the complementary energy of electrokinetic cell；And discarded electrokinetic cell has been recycled, it is achieved that energy-conserving and environment-protective.
The present invention is realized in that above-mentioned purpose:
Lithium-ion-power cell echelon utilizes analysis method, it is characterised in that comprise the following steps:
A. lithium-ion-power cell to be analyzed is screened in advance；
B. the use working condition provided according to user through the lithium-ion-power cell of pre-screening, including work temperatureWorkAnd electric discharge operating current IWork, it is determined that corresponding electric discharge evaluation and test condition, including electric discharge evaluation and test temperature TEvaluation and testAnd fixing discharge-rate IEvaluation and testLithium-ion-power cell is carried out electric discharge evaluation and test and obtains equilibrium potential curve and equivalent internal resistance curve；
C. formula EMF is utilizedSoC=IWork*rSoC+UL(1),
Wherein, IWorkIt is electric discharge operating current, ULBeing discharge cut-off voltage, SoC is lithium-ion-power cell state-of-charge, EMFSoCIt is the equilibrium potential corresponding to a SoC value, rSoCIt it is the equivalent internal resistance corresponding to a SoC value；Take different SoC values respectively and obtain corresponding EMF according to equilibrium potential curve and equivalent internal resistance curveSoCAnd rSoC, and by EMFSoCAnd rSoCSubstitute in formula ()；
D. until formula () is met, and the SoC value that record is now is SoCWork, substitute into formula
η=100%-SoCWork(2),
Wherein, η is capacity coefficient, then capacity coefficient is substituted into formula
Q=Q ' * η (three),
Wherein, Q is the actual active volume of lithium-ion-power cell, and Q ' is lithium-ion-power cell raw capacity；According to lithium-ion-power cell actual active volume Q, lithium-ion-power cell is carried out echelon screening.
Wherein, the evaluation and test of the electric discharge in step b comprises the following steps:
B1. at fixing evaluation and test temperature TEvaluation and testUnder lithium-ion-power cell is charged until being completely filled with；
B2. with fixing discharge-rate IEvaluation and testLithium-ion-power cell is carried out constant-current discharge, and continues the discharge time set；If the voltage of lithium-ion-power cell is lower than discharge cut-off voltage in discharge time, then enter step b4, otherwise enter step b3；
B3. keep lithium ion battery in the state of shelving, continue for some time, be then back to step b2；
B4. utilize trickle to lithium-ion electric tank discharge until completely emptying；
B5. keeping lithium ion battery in the state of shelving, continue for some time, test terminates；
Test process records voltage and the current data in each moment.To each active section b2, picking and placeing before electricity terminates corresponding voltage at the last moment is the discharge voltage U under this SoC levelSoC, to each section of shelving b3, take standing terminate before at the last moment corresponding voltage be the equilibrium potential EMF under this SoC levelSoC, substitute into below equation
rSoC=(EMFSoC-USoC)/IEvaluation and test(4),
Calculate the equivalent internal resistance r obtained under this SoC levelSoC, utilize the mode of matching or interpolation to obtain equivalent internal resistance curve the equivalent internal resistance under different SoC.
Wherein, described work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testIdentical.
Work as work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testTime different, EMFSoCWith rSoCChange according to below equation,
EMF’SoC=EMFSoC*βTemperature(5),
r’SoC=rSoC*αTemperature(6),
Wherein βTemperatureAnd αTemperatureRespectively EMFSoCAnd rSoCTemperature coefficient, by the EMF in formula ()SoCReplace with EMF 'SoC, rSoCReplace with r 'SoC。
Wherein, after lithium-ion-power cell being carried out echelon screening according to lithium-ion-power cell actual active volume Q, calculate the degradation used under working condition according still further to below equation, utilize degradation that lithium-ion-power cell carries out secondary echelon screening,
SOH(r 'SoC)=(r 'SoC-rnew)/(rold-rnew) (seven),
Wherein, r 'SoCIt is lithium-ion-power cell actual internal resistance under running conditions, rnewIt is the nominal discharge internal resistance of lithium-ion-power cell, roldIt it is electric discharge internal resistance during default lithium-ion-power cell life termination.
The invention has the beneficial effects as follows: prior art adopts the lithium-ion-power cell capacity of single measurement and internal resistance value to carry out classification combo, do not ensure that the concordance under specific operation, such as certain under 20 degree batch battery, record capacity and internal resistance in the scope of application, but it is placed under 0 degree of environment and is then likely to exceed tolerance interval, temperature has been considered for this this method, the impact on lithium-ion-power cell screening of operating mode, evaluate and test based on the carrying out of lithium-ion-power cell being discharged under a certain temperature conditions and quickly speculate the actual active volume under specified conditions and internal resistance etc., and according to parameters such as actual active volume and internal resistances, lithium-ion-power cell carried out rational echelon screening, to ensure the concordance of Li-ion batteries piles that secondary utilizes, the utilization of resources making waste and old electrokinetic cell can realize maximizing.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is the equilibrium potential curve chart that electric discharge evaluation and test obtains；
Fig. 2 is the equivalent internal resistance curve chart that electric discharge evaluation and test obtains；
Fig. 3 is the experimental data figure that lithium-ion-power cell carries out in electric discharge evaluation and test electric discharge internal resistance assessment test.
Detailed description of the invention
Lithium-ion-power cell echelon utilizes analysis method, it is characterised in that comprise the following steps:
A. lithium-ion-power cell to be analyzed is screened in advance.
First is disassemble, and to reclaiming after the discarded power battery pack that obtains discharges, then lossless disassembles, it is thus achieved that battery cell；With screwdriver, the screw dismounting in set of cells is got off, remove the parts of non-battery monomer one by one, the position that screwdriver cannot be used to disassemble is used cutter cutting, disassembles into battery module from set of cells, disassemble into battery cell from battery module again, finally obtain several battery cells.The electrokinetic cell of specification of the same race, model of the same race is separated by group.
Second is outward appearance screening, after the set of cells got off retired on electric automobile being split, specification of the same race, the electrokinetic cell of model of the same race and electrokinetic cell to be analyzed carries out evaluated for appearance to obtain the electrokinetic cell having echelon value.Judge that the standard whether outward appearance of electrokinetic cell is intact is, judge that whether smooth its surface is dry, with or without breakage, with or without deformation, with or without spot, with or without bulge flatulence phenomenon, outward appearance identification need to carry out under good light condition, filter out and think the electrokinetic cell having echelon value, and the battery without echelon value is directly entered recovery process.
3rd is self discharge detection, and in use, potential safety hazard largely originates from the internal short-circuit of battery to electrokinetic cell, and for the electrokinetic cell through life-time service, its potential safety hazard substantially increases.Self-discharge of battery is a parameter that can reflect internal resistance of cell short circuit problem very well, by testing the self discharge parameter of battery, can get rid of the battery of internal short-circuit to a great extent.Testing process is: be full of with 1/3C electric current by battery, shelves 7 days, the voltage of re-test battery under room temperature (25 DEG C), calculates the self-discharge rate of battery.Using self-discharge rate as the parameter considered at first in battery screening process, reject the battery that self-discharge rate is higher.
B. the use working condition provided according to user through the lithium-ion-power cell of pre-screening, including work temperatureWorkAnd electric discharge operating current IWork, it is determined that corresponding electric discharge evaluation and test condition, including electric discharge evaluation and test temperature TEvaluation and testAnd fixing discharge-rate IEvaluation and testLithium-ion-power cell is carried out electric discharge evaluation and test and obtains equilibrium potential curve (with reference to Fig. 1) and equivalent internal resistance curve (with reference to Fig. 2).Wherein, in order to accurately obtain electric discharge evaluation and test data, work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testIdentical.It is contemplated that the working condition of lithium-ion-power cell, especially operating temperature can produce corresponding change, work temperature with the change of external environment conditionWorkTherefore a not steady state value, even if arranging work temperatureWorkEqual to electric discharge evaluation and test temperature TEvaluation and testCarry out electric discharge evaluation and test, the lithium-ion-power cell situation in other operating temperatures can not be reflected completely.But inventor's research shows, electric discharge evaluation and test data are linear with temperature, namely work as work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testTime different, EMFSoCWith rSoCMeet below equation,
EMF’SoC=EMFSoC*βTemperature(5),
r’SoC=rSoC*αTemperature(6),
Wherein βTemperatureAnd αTemperatureRespectively EMFSoCAnd rSoCTemperature coefficient, by the EMF in formula ()SoCReplace with EMF 'SoC, rSoCReplace with r 'SoC.Therefore have only at electric discharge evaluation and test temperature TEvaluation and testUnder carry out electric discharge evaluation and test, the EMF ' during other operating temperatures can be obtainedSoCAnd r 'SoC, and judge that lithium-ion-power cell disclosure satisfy that the use needs of special scenes accordingly.
The job step of electric discharge evaluation and test is described below in detail:
B1. at fixing evaluation and test temperature TEvaluation and testUnder lithium-ion-power cell is charged until being completely filled with；
B2. with fixing discharge-rate IEvaluation and testLithium-ion-power cell is carried out constant-current discharge, and continues the 300 seconds discharge times set；If the voltage of lithium-ion-power cell is lower than discharge cut-off voltage 2.2V in 300 seconds discharge times, then enter step b4, otherwise enter step b3；
B3. keep lithium ion battery in the state of shelving, continue 10 minutes, be then back to b2；
B4. utilize 0.01C trickle to lithium-ion-power cell electric discharge until completely emptying；
B5. keeping lithium ion battery in the state of shelving, continue for some time, test terminates；
Test process records voltage and the current data in each moment.To each active section b2, picking and placeing before electricity terminates corresponding voltage at the last moment is the discharge voltage U under this SoC levelSoC, to each section of shelving b3, take standing terminate before at the last moment corresponding voltage be the equilibrium potential EMF under this SoC levelSoC, substitute into formula rSoC=(EMFSoC-USoC)/IEvaluation and test(4),
Calculate the equivalent internal resistance r obtained under this SoC levelSoC, utilize the mode of matching or interpolation to obtain equivalent internal resistance curve the equivalent internal resistance under different SoC.
With specific embodiment, electric discharge evaluation and test is described in detail below.
1. pair lithium-ion-power cell is charged.With the constant voltage of the constant current of 0.5C, 3.7V, battery being charged, the cut-off current of charging is 0.033C.This step purpose is to try to be completely filled with battery electric quantity, and national sector standard QC/T743 specifies, is filled when charging current is considered as battery less than 0.033C.Being shelved by battery 10 minutes after charging complete, because battery is in charging process, inside will necessarily produce a certain amount of heat, for ensureing that inside battery can be completely consistent with ambient temperature, it is necessary to shelve a period of time.
2. discharging 5 minutes with 0.5C current versus cell, control discharge cut-off voltage is 2.2V simultaneously.Now the voltage of battery declines rapidly, and the voltage of detection battery when electric discharge terminates, this magnitude of voltage is overpotential USoC。
3. then being shelved by battery 10 minutes, now voltage can slowly rise until stable, and to record the magnitude of voltage after having shelved be equilibrium potential EMFSoC。
4. repeat step 2,3 three ten times, every time the data of record are the U corresponding to each SoC of batterySoCAnd EMFSoC。
5. consider that the electric discharge equivalent resistance in latter stage of battery is bigger than normal, be difficult to when discharge-rate is excessive be allowed to dry battery, it is therefore desirable to use low discharging current instead, be discharged to blanking voltage 2.2V with 0.01C current versus cell.
6. shelve 10 minutes.
7. repeat step 5,60 times.
8. electric discharge evaluation and test terminates.
Fig. 3 is the experimental data that the lithium iron phosphate dynamic battery of certain 20Ah is carried out electric discharge internal resistance assessment test by the electric discharge evaluation and test step according to design above.As seen from the figure, cell voltage is about 3.5V when test starts, and with the constant voltage of the constant current of 0.5C, 3.7V, battery is charged after entering step 1, and cell voltage rises rapidly, until 3.7V and charging current reach 0.033C, this step is to be full of by battery electric quantity.After step 1 is shelved, discharging 5 minutes with 0.5C current versus cell in step 2, cell voltage declines rapidly.During step 3 is shelved, battery is due to overpotential characteristic, and voltage can slowly rise, until stable.And difference in voltage when terminating of the voltage that step 2 is when terminating and step 3 is precisely due to the superpotential concrete numerical value that causes of equivalence electric discharge internal resistance, utilize formula (four), with this numerical value divided by discharge current, it is possible to calculate equivalence and discharge internal resistance.Repeating 2,3 steps, the electricity that battery is released can be gradually increased, and cell voltage is also gradually reduced, and can be obtained by equivalence electric discharge internal resistance corresponding under multiple SoC simultaneously.Again because discharging with 0.5C in theory, battery is from the state that is completely filled with to being allowed to dry state, need the time of 120 minutes, and step 2 is only put 5 minutes every time, so at least needing to carry out 24 times (120/5=24), in order to ensure that battery can be allowed to dry with 0.5C electric current as far as possible, the number of times of this repetition is increased to 30 times from 24 times.Battery is repeated electric discharge with 0.033C small area analysis by step 5 to 7, because electric discharge equivalent internal resistance in latter stage is bigger than normal, is difficult to be allowed to dry battery when discharge-rate is excessive, so in order to enable to ensure, by battery emptying, to use low discharging current instead as far as possible.So far, it is possible to obtain the equivalence electric discharge internal resistance corresponding to battery difference SoC.
C. step b will test equilibrium potential curve and the equivalent internal resistance curve of acquisition, utilize formula
EMFSoC=IWork*rSoC+UL(1),
Wherein, IWorkIt is electric discharge operating current, ULBeing discharge cut-off voltage, SoC is lithium-ion-power cell state-of-charge, EMFSoCIt is the equilibrium potential corresponding to a SoC value, rSoCIt it is the equivalent internal resistance corresponding to a SoC value；Take different SoC values respectively and obtain corresponding EMF according to equilibrium potential curve and equivalent internal resistance curveSoCAnd rSoC, and by EMFSoCAnd rSoCSubstitute in formula ().
D. in general it is carry out substituting into according to SoC mode from right to left calculating, always has the EMF corresponding to unique SoC valueSoCAnd rSoCDisclosure satisfy that formula (), and the SoC value that record is now is SoCWork, substitute into formula
η=100%-SoCWork(2),
Wherein, η is capacity coefficient, then capacity coefficient is substituted into formula
Q=Q ' * η (three),
Wherein, Q is the actual active volume of lithium-ion-power cell, and Q ' is lithium-ion-power cell raw capacity；According to lithium-ion-power cell actual active volume Q, lithium-ion-power cell is carried out echelon screening.
In order to improve the concordance of the lithium-ion-power cell that combo uses further, after lithium-ion-power cell being carried out echelon screening according to lithium-ion-power cell actual active volume Q, the degradation used under working condition is calculated according still further to below equation, utilize degradation that lithium-ion-power cell carries out secondary echelon screening
SOH(r 'SoC)=(r 'SoC-rnew)/(rold-rnew) (seven),
Wherein, r 'SoCIt is lithium-ion-power cell actual internal resistance under running conditions, rnewIt is the nominal discharge internal resistance of lithium-ion-power cell, roldIt it is electric discharge internal resistance during default lithium-ion-power cell life termination.
The method screened below as above-mentioned echelon provides practical application example.
Case 1: assume that certain batch of vehicle-mounted retired lithium-ion-power cell to be applied in the energy storage electricity cabinet of machine room by certain client, it is proposed to working condition requirement be under the operating temperature of 30 DEG C and the operating current of 30A, the capacity of 85Ah can be released.
It is as follows that concrete combo implements step:
(1) first carry out on-vehicle battery splitting and pre-screening；
(2) this batch of cell does electric discharge evaluation and test, and the concrete work step of evaluation and test, with reference to work step b, c, d, wherein evaluates and tests temperature TEvaluation and testIt is 20 DEG C, IEvaluation and testFor 0.5C, obtain corresponding equivalent internal resistance spectral curve and balance potential curve；
(3) operating temperature 30 DEG C and the operating current 30A that client are proposed substitute in formula (), obtain the SoC value that each cell satisfies condition, then obtain the actual capacity Q-value corresponding to each cell；
(4) for the Q-value cell less than the capacity 85Ah of customer requirement, remain the battery for other low ranges or low capacity require and utilize occasion；For available capacity higher than the cell of 85Ah, with 5Ah for step battery it is grouped and assembles, such as by Q-value battery between 85 ~ 90Ah in groups, by that analogy.
Case 2: battery applications environment that client is proposed and power demand are inherently with echelon requirement, and such as certain client will by vehicle-mounted retired battery applications in many occasions.The working condition requirement of its proposition is under the operating temperature of 30 DEG C and the operating current of 30A, can release the capacity of 90Ah；The capacity of 85Ah can be released under 30 DEG C of operating modes with 20A；The capacity of 83Ah can be released under 20 DEG C of operating modes with 20A ....
So in concrete combo process, step (1) ~ (2) are ibid；
(3) temperature under various working conditions client proposed and electric current substitute in formula (), obtain each cell actual capacity Q in different operating modesiValue, (i=1,2,3 ...)；
(4) if the available capacity Q of a certain batteryiValue is unsatisfactory for any step working condition requirement, then rejected；
(5) if the available capacity Q of a certain batteryiValue meets many steps working condition requirement, then be classified as the candidate battery under these operating modes；
(6) if the available capacity Q of a certain batteryiValue only meets wherein a certain working condition requirement, then filed and utilize battery for the echelon under this operating mode；
(7) require battery is grouped according to the proposed echelon of client, for battery cell number under certain operating mode not enough in the case of, the candidate's cell corresponding to this working condition can be supplemented and complete combo.
To sum up, according to proposed battery testing group gas-mixing screening scheme, it is possible to the volume battery filtered out is carried out combo and utilizes to realize echelon so that the utilization of resources of waste and old electrokinetic cell can realize maximizing.
Claims (6)
1. lithium-ion-power cell echelon utilizes analysis method, it is characterised in that comprise the following steps:
Lithium-ion-power cell to be analyzed is screened in advance；
Through the use working condition that the lithium-ion-power cell of pre-screening provides according to user, including work temperatureWorkAnd electric discharge operating current IWork, it is determined that corresponding electric discharge evaluation and test condition, including electric discharge evaluation and test temperature TEvaluation and testAnd fixing discharge-rate IEvaluation and testLithium-ion-power cell is carried out electric discharge evaluation and test and obtains equilibrium potential curve and equivalent internal resistance curve；
Utilize formula EMFSoC=IWork*rSoC+UL(1),
Wherein, IWorkIt is electric discharge operating current, ULBeing discharge cut-off voltage, SoC is lithium-ion-power cell state-of-charge, EMFSoCIt is the equilibrium potential corresponding to a SoC value, rSoCIt it is the equivalent internal resistance corresponding to a SoC value；
Take different SoC values respectively and obtain corresponding EMF according to equilibrium potential curve and equivalent internal resistance curveSoCAnd rSoC, and by EMFSoCAnd rSoCSubstitute in formula ()；
Until formula () is met, and the SoC value that record is now is SoCWork, substitute into formula
η=100%-SoCWork(2),
Wherein, η is capacity coefficient, then capacity coefficient is substituted into formula
Q=Q ' * η (three),
Wherein, Q is the actual active volume of lithium-ion-power cell, and Q ' is lithium-ion-power cell raw capacity；According to lithium-ion-power cell actual active volume Q, lithium-ion-power cell is carried out echelon screening.
2. lithium-ion-power cell echelon according to claim 1 utilizes analysis method, it is characterised in that: the electric discharge evaluation and test in step b comprises the following steps:
B1. at fixing evaluation and test temperature TEvaluation and testUnder lithium-ion-power cell is charged until being completely filled with；
B2. with fixing discharge-rate IEvaluation and testLithium-ion-power cell is carried out constant-current discharge, and continues the discharge time set；If the voltage of lithium-ion-power cell is lower than discharge cut-off voltage in discharge time, then enter step b4, otherwise enter step b3；
B3. keep lithium ion battery in the state of shelving, continue for some time, be then back to step b2；
B4. utilize trickle to lithium-ion electric tank discharge until completely emptying；
B5. keeping lithium ion battery in the state of shelving, continue for some time, test terminates；
Test process records voltage and the current data in each moment.
3. couple each active section b2, picking and placeing before electricity terminates corresponding voltage at the last moment is the discharge voltage U under this SoC levelSoC, to each section of shelving b3, take standing terminate before at the last moment corresponding voltage be the equilibrium potential EMF under this SoC levelSoC, substitute into below equation
rSoC=(EMFSoC-USoC)/IEvaluation and test(4),
Calculate the equivalent internal resistance r obtained under this SoC levelSoC, utilize the mode of matching or interpolation to obtain equivalent internal resistance curve the equivalent internal resistance under different SoC.
4. lithium-ion-power cell echelon according to claim 1 utilizes analysis method, it is characterised in that: described work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testIdentical.
5. lithium-ion-power cell echelon according to claim 1 utilizes analysis method, it is characterised in that: work as work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testTime different, EMFSoCWith rSoCChange according to below equation,
EMF’SoC=EMFSoC*βTemperature(5),
r’SoC=rSoC*αTemperature(6),
Wherein βTemperatureAnd αTemperatureRespectively EMFSoCAnd rSoCTemperature coefficient, by the EMF in formula ()SoCReplace with EMF 'SoC, rSoCReplace with r 'SoC。
6. lithium-ion-power cell echelon according to claim 4 utilizes analysis method, it is characterized in that: after lithium-ion-power cell being carried out echelon screening according to lithium-ion-power cell actual active volume Q, the degradation used under working condition is calculated according still further to below equation, utilize degradation that lithium-ion-power cell carries out secondary echelon screening
SOH(r 'SoC)=(r 'SoC-rnew)/(rold-rnew) (seven),
Wherein, r 'SoCIt is lithium-ion-power cell actual internal resistance under running conditions, rnewIt is the nominal discharge internal resistance of lithium-ion-power cell, roldIt it is electric discharge internal resistance during default lithium-ion-power cell life termination.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106180002B (en) * | 2016-07-11 | 2018-10-30 | 北京长城华冠汽车科技股份有限公司 | A kind of battery screening technique utilized for echelon |
| CN106180002A (en) * | 2016-07-11 | 2016-12-07 | 北京长城华冠汽车科技股份有限公司 | A kind of battery screening method utilized for echelon |
| CN108107368A (en) * | 2016-11-18 | 2018-06-01 | 半导体组件工业公司 | For estimating the method and apparatus of the health status of battery |
| CN107085187A (en) * | 2017-04-13 | 2017-08-22 | 华北电力科学研究院有限责任公司 | Echelon utilizes the determination method and device of battery energy storage system consistency maintenance index |
| CN107085187B (en) * | 2017-04-13 | 2019-06-07 | 华北电力科学研究院有限责任公司 | Echelon utilizes the determination method and device of battery energy storage system consistency maintenance index |
| CN108508365A (en) * | 2017-04-16 | 2018-09-07 | 万向二三股份公司 | A kind of lithium ion battery self discharge screening technique |
| CN108155426A (en) * | 2017-12-25 | 2018-06-12 | 合肥工业大学智能制造技术研究院 | Battery Gradient utilization method based on attenuation characteristic parameter |
| CN108398642B (en) * | 2018-01-10 | 2020-06-02 | 中山大学 | Lithium ion power battery SOC online calibration method |
| CN108398642A (en) * | 2018-01-10 | 2018-08-14 | 中山大学 | A kind of lithium-ion-power cell SOC on-line calibration methods |
| CN108398647A (en) * | 2018-03-01 | 2018-08-14 | 杭州高特新能源技术有限公司 | Lithium battery difference charging and discharging curve acquisition methods |
| CN108398647B (en) * | 2018-03-01 | 2020-07-24 | 杭州高特新能源技术有限公司 | Method for acquiring different charging and discharging curves of lithium battery |
| CN108636834A (en) * | 2018-03-28 | 2018-10-12 | 中国电力科学研究院有限公司 | A kind of pair can the echelon method for separating and system of the retired power battery that utilize |
| CN113567771A (en) * | 2020-04-29 | 2021-10-29 | 南通江海储能技术有限公司 | Echelon screening method for lithium ion capacitor |
| CN112966208A (en) * | 2021-02-02 | 2021-06-15 | 西华大学 | Multi-parameter influence screening method for cascade utilization of power batteries of electric vehicles |
| CN112966208B (en) * | 2021-02-02 | 2022-09-23 | 浙江新时代中能科技股份有限公司 | Multi-parameter influence screening method for cascade utilization of power batteries of electric vehicles |
| CN113406504A (en) * | 2021-06-17 | 2021-09-17 | 上海空间电源研究所 | Consistency screening method for high-power lithium ion storage battery |
| CN113447826A (en) * | 2021-09-01 | 2021-09-28 | 蜂巢能源科技有限公司 | SOC determination method and device based on steady-state equivalent circuit model |
| CN114660478A (en) * | 2022-05-12 | 2022-06-24 | 中创新航科技股份有限公司 | Battery device, detection method thereof, screening method and screening device of battery unit |
| CN117970159A (en) * | 2024-04-02 | 2024-05-03 | 深圳深汕特别合作区乾泰技术有限公司 | Method, system and medium for evaluating availability of waste battery based on big data |
| CN117970159B (en) * | 2024-04-02 | 2024-06-07 | 深圳深汕特别合作区乾泰技术有限公司 | Method, system and medium for evaluating availability of waste battery based on big data |
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