CN105738830B - Lithium-ion-power cell echelon utilizes analysis method - Google Patents
Lithium-ion-power cell echelon utilizes analysis method Download PDFInfo
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- CN105738830B CN105738830B CN201610229866.9A CN201610229866A CN105738830B CN 105738830 B CN105738830 B CN 105738830B CN 201610229866 A CN201610229866 A CN 201610229866A CN 105738830 B CN105738830 B CN 105738830B
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- 238000004458 analytical method Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 73
- 238000011156 evaluation Methods 0.000 claims abstract description 59
- 238000012216 screening Methods 0.000 claims abstract description 19
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 15
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 8
- 230000015556 catabolic process Effects 0.000 claims description 5
- 238000006731 degradation reaction Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000000178 monomer Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation 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
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 206010016766 flatulence Diseases 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 239000011133 lead Substances 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
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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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Abstract
The invention discloses a kind of lithium-ion-power cell echelons to utilize analysis method, the influence of temperature, operating mode screened to lithium-ion-power cell is considered, based on carrying out the actually available capacity under electric discharge evaluation and test and quickly supposition specified conditions and internal resistance etc. to lithium-ion-power cell under a certain temperature condition, and rational echelon screening is carried out to lithium-ion-power cell according to parameters such as actually available capacity and internal resistances, to ensure the consistency of the Li-ion batteries piles of secondary use so that the utilization of resources of waste and old power battery may be implemented to maximize.
Description
Technical field
The present invention relates to a kind of analyses to the progress echelon screening of applying waste lithium ionic power battery to be reused
Method.
Background technology
With the gradually industrialization of electric vehicle, the yield of electric powered motor lithium ion battery will greatly improve, therewith
And come problem be, waste and old power lithium-ion battery this how to recycle and handle.Contain in power lithium-ion battery for electric vehicle
There are the metal materials such as lead, nickel, cobalt, lithium and electrolyte, once scrapped batteries cannot be effectively recycled, not only causes
The waste of resource is also particularly acute the pollution of environment.
It is utilized by echelon, not only power accumulator performance can be allowed to be fully played, be conducive to energy-saving and emission-reduction, also
A large amount of power accumulators can be alleviated and enter the pressure that recovery stage is brought to recovery operation.But at this stage for waste and old power
The screening of battery, still without specific definition and method.How these are also had to the battery of most of capacity reasonably again
Use the research for being a unusual valuable and meaning.So battery is carried out echelon utilization, first have to automobile-used superseded lithium
The characteristic of ion battery is studied.However following technical problem exists in the prior art：It eliminates from electric vehicle
Power battery, health status is not consistent, it is necessary to strictly screened, eliminate with most of battery is inconsistent lacks
Subproblem battery, only by reasonably screening, secondary use can just give full play to its value.
Invention content
It is grouped it is an object of the invention to provide the screening utilized to lithium-ion-power cell echelon and a kind of having for row is provided
The method of effect, this method reasonable estimation available capacity of single battery, and according to this they are reassembled into new power
Battery pack is with applied to different occasions.The complementary energy of power battery can not only be made full use of；And to discarded power battery into
It has gone recycling, has realized energy conservation and environmental protection.
The present invention is realized in that above-mentioned purpose：
Lithium-ion-power cell echelon utilizes analysis method, it is characterised in that includes the following steps：
A. prescreening is carried out to lithium-ion-power cell to be analyzed；
B. the use operating condition that the lithium-ion-power cell through prescreening is provided according to user, including work temperatureWork
And electric discharge operating current IWork, determine corresponding electric discharge evaluation and test condition, including electric discharge evaluation and test temperature TEvaluation and testAnd fixed electric discharge times
Rate IEvaluation and testElectric discharge evaluation and test is carried out to lithium-ion-power cell and obtains equilibrium potential curve and equivalent internal resistance curve；
C. formula EMF is utilizedSoC=IWork*rSoC+UL（One）,
Wherein, IWorkIt is electric discharge operating current, ULIt is discharge cut-off voltage, SoC is lithium-ion-power cell state-of-charge,
EMFSoCIt is the equilibrium potential corresponding to a SoC values, rSoCIt is the equivalent internal resistance corresponding to a SoC values；Different SoC values are taken respectively
Corresponding EMF is obtained according to equilibrium potential curve and equivalent internal resistance curveSoCAnd rSoC, and by EMFSoCAnd rSoCSubstitute into formula（One）
In；
D. until formula（One）Met, and the SoC values recorded at this time are SoCWork, substitute into formula
η=100%-SoCWork（Two）,
Wherein, η is capacity coefficient, then capacity coefficient is substituted into formula
Q=Q’*η （Three）,
Wherein, Q is the actually available capacity of lithium-ion-power cell, and Q ' is lithium-ion-power cell raw capacity；According to lithium
The actually available capacity Q of ion battery carries out echelon screening to lithium-ion-power cell.
Wherein, the electric discharge evaluation and test in step b includes the following steps：
B1. in fixed evaluation and test temperature TEvaluation and testUnder lithium-ion-power cell charge until be completely filled with；
B2. with fixed discharge-rate IEvaluation and testWhen carrying out constant-current discharge to lithium-ion-power cell, and continuing the electric discharge of setting
Between；If the voltage of lithium-ion-power cell is less than discharge cut-off voltage in discharge time, b4 is entered step, is otherwise entered step
b3；
B3. it keeps lithium ion battery in the state of shelving, continues for some time, be then back to step b2；
B4. utilize trickle to lithium-ion electric tank discharge until emptying completely；
B5. it keeps lithium ion battery in the state of shelving, continues for some time, test terminates；
The voltage and current data at each moment are recorded in test process.To each active section b2, pick and place before electricity terminates most
A moment corresponding voltage is the discharge voltage U under the SoC levels afterwardsSoC, a section b3 is shelved to each, before taking standing to terminate at the last moment
Corresponding voltage is the equilibrium potential EMF under the SoC levelsSoC, substitute into following formula
rSoC=（EMFSoC-USoC）/IEvaluation and test（Four）,
Calculate the equivalent internal resistance r obtained under the SoC levelsSoC, the equivalent internal resistance under different SoC is utilized into fitting or interpolation
Mode obtain equivalent internal resistance curve.
Wherein, the work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testIt is identical.
Work as work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testWhen different, EMFSoCWith rSoCIt is converted according to following formula,
EMF’SoC=EMFSoC*βTemperature（Five）,
r’SoC=rSoC*αTemperature（Six）,
Wherein βTemperatureAnd αTemperatureRespectively EMFSoCAnd rSoCTemperature coefficient, by formula（One）In EMFSoCIt replaces with
EMF’SoC, rSoCReplace with r 'SoC。
Wherein, after carrying out echelon screening to lithium-ion-power cell according to the actually available capacity Q of lithium-ion-power cell, then
It calculates using the degradation under operating condition, lithium-ion-power cell is carried out using degradation secondary according to following formula
Echelon is screened,
SOH（r’ SoC）=（r’ SoC -rnew）/（rold- rnew）（Seven）,
Wherein, r ' SoCIt is the practical internal resistance of lithium-ion-power cell under running conditions, rnewIt is lithium-ion-power cell
Nominal discharge internal resistance, roldElectric discharge internal resistance when being preset lithium-ion-power cell life termination.
The beneficial effects of the invention are as follows：The prior art using single measurement lithium-ion-power cell capacity and internal resistance value into
Row classification combo does not ensure that the consistency under specific operation, such as certain under 20 degree batch battery, measures capacity and internal resistance
It in the scope of application, but places it under 0 degree of environment and may then exceed tolerance interval, this method has considered temperature thus
Degree, operating mode to lithium-ion-power cell screening influence, based under a certain temperature condition to the progress of lithium-ion-power cell
Actually available capacity under electric discharge evaluation and test and quickly supposition specified conditions and internal resistance etc., and according to actually available capacity and interior
The parameters such as resistance carry out rational echelon screening to lithium-ion-power cell, with ensure secondary use Li-ion batteries piles it is consistent
Property so that the utilization of resources of waste and old power battery may be implemented to maximize.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples：
Fig. 1 is the equilibrium potential curve graph that electric discharge evaluation and test obtains；
Fig. 2 is the equivalent internal resistance curve graph that electric discharge evaluation and test obtains；
Fig. 3 is the experimental data figure for carrying out electric discharge internal resistance assessment test in electric discharge evaluation and test to lithium-ion-power cell.
Specific implementation mode
Lithium-ion-power cell echelon utilizes analysis method, it is characterised in that includes the following steps：
A. prescreening is carried out to lithium-ion-power cell to be analyzed.
First is dismantling, and after discharging the discarded power battery pack that recycling obtains, then lossless dismantling obtains battery
Monomer；The screw dismounting in battery pack is got off with screwdriver, the component of non-battery monomer is removed one by one, to spiral shell can not be used
The position of silk knife dismantling is cut using cutter, is disassembled from battery pack into battery module, then is disassembled from battery module into battery cell,
Finally obtain several battery cells.The power battery of specification of the same race, model of the same race is separated by group.
Second is appearance screening, after the retired battery pack got off is split on electric vehicle, to specification of the same race, together
The power battery of kind model, that is, power battery to be analyzed carries out evaluated for appearance to obtain the power battery of echelon utility value.
Judge that the whether intact standard of the appearance of power battery is to judge the whether smooth drying in its surface, whether there is or not breakage, whether there is or not deformation,
Whether there is or not spots, and whether there is or not bulge flatulence phenomenon, appearance identification need to carry out under good light condition, filter out and think to have echelon sharp
With the power battery of value, and the battery without echelon utility value is directly entered recovery process.
Third is self discharge detection, and in use, security risk is largely in battery to power battery
Portion's short circuit, for the power battery by being used for a long time, security risk obviously increases.Self-discharge of battery is that an energy is fine
The parameter for reflecting internal resistance of cell short circuit problem can be excluded largely internal short by testing the self discharge parameter of battery
The battery on road.Testing process is：Battery is full of with 1/3C electric currents, in room temperature（25℃）Under shelve 7 days, re-test battery
Voltage, calculate the self-discharge rate of battery.Using self-discharge rate as the parameter considered at first in battery screening process, rejects and put certainly
The electric higher battery of rate.
B. the use operating condition that the lithium-ion-power cell through prescreening is provided according to user, including work temperatureWork
And electric discharge operating current IWork, determine corresponding electric discharge evaluation and test condition, including electric discharge evaluation and test temperature TEvaluation and testAnd fixed electric discharge times
Rate IEvaluation and testElectric discharge evaluation and test is carried out to lithium-ion-power cell and obtains equilibrium potential curve（Referring to Fig.1）And equivalent internal resistance curve（Reference
Fig. 2）.Wherein, data, work temperature are evaluated and tested in order to accurately obtain electric dischargeWorkWith electric discharge evaluation and test temperature TEvaluation and testIt is identical.It is contemplated that
Corresponding variation can be generated with the variation of external environment to the operating condition of lithium-ion-power cell, especially operating temperature,
Work temperatureWorkA not steady state value, therefore even if agreement work temperatureWorkEqual to electric discharge evaluation and test temperature TEvaluation and testIt discharges
Evaluation and test can not reflect lithium-ion-power cell other operating temperatures the case where completely.But inventor is studies have shown that electric discharge
It evaluates and tests data and temperature is in a linear relationship, that is, work as work temperatureWorkWith electric discharge evaluation and test temperature TEvaluation and testWhen different, EMFSoCWith
rSoCMeet following formula,
EMF’SoC=EMFSoC*βTemperature（Five）,
r’SoC=rSoC*αTemperature（Six）,
Wherein βTemperatureAnd αTemperatureRespectively EMFSoCAnd rSoCTemperature coefficient, by formula（One）In EMFSoCIt replaces with
EMF’SoC, rSoCReplace with r 'SoC.Therefore it only needs in electric discharge evaluation and test temperature TEvaluation and testUnder carry out electric discharge evaluation and test, you can obtain other works
Make the EMF ' when temperatureSoCAnd r 'SoC, and judge that lithium-ion-power cell disclosure satisfy that the use needs of special scenes accordingly.
The work step of electric discharge evaluation and test is described below in detail：
B1. in fixed evaluation and test temperature TEvaluation and testUnder lithium-ion-power cell charge until be completely filled with；
B2. with fixed discharge-rate IEvaluation and testWhen carrying out constant-current discharge to lithium-ion-power cell, and continuing the electric discharge of setting
Between 300 seconds；If the voltage of lithium-ion-power cell is less than discharge cut-off voltage 2.2V in 300 seconds discharge times, enter step
Otherwise b4 enters step b3；
B3. it keeps lithium ion battery in the state of shelving, continues 10 minutes, be then back to b2；
B4. utilize 0.01C trickles to lithium-ion-power cell electric discharge until emptying completely；
B5. it keeps lithium ion battery in the state of shelving, continues for some time, test terminates；
The voltage and current data at each moment are recorded in test process.To each active section b2, pick and place before electricity terminates most
A moment corresponding voltage is the discharge voltage U under the SoC levels afterwardsSoC, a section b3 is shelved to each, before taking standing to terminate at the last moment
Corresponding voltage is the equilibrium potential EMF under the SoC levelsSoC, substitute into formula rSoC=（EMFSoC-USoC）/IEvaluation and test（Four）,
Calculate the equivalent internal resistance r obtained under the SoC levelsSoC, the equivalent internal resistance under different SoC is utilized into fitting or interpolation
Mode obtain equivalent internal resistance curve.
Electric discharge evaluation and test is described in detail with specific embodiment below.
1. a pair lithium-ion-power cell charges.It is charged to battery with the constant voltage of the constant current of 0.5C, 3.7V,
The cut-off current of charging is 0.033C.The purpose of this step is to try to battery capacity being completely filled with, national sector standard QC/T743
Regulation, has been filled when charging current is considered as battery less than 0.033C.Battery is shelved 10 minutes after charging complete, because electric
Pond in charging process, inside necessarily will produce a certain amount of heat, for ensure inside battery can completely with environment temperature it is consistent,
It is necessary to shelve a period of time.
2. being discharged 5 minutes with 0.5C current versus cells, while it is 2.2V to control discharge cut-off voltage.The voltage of battery at this time
It is rapid to decline, the voltage of battery is detected at the end of electric discharge, which is overpotential USoC。
3. battery is then shelved 10 minutes, voltage can slowly rise until stablize at this time, and after the completion of recording and shelving
Voltage value is equilibrium potential EMFSoC。
4. repeat step 2,3 three ten times, the data recorded every time be each SoC of battery corresponding to USoCAnd EMFSoC。
It is difficult to be allowed to dry battery when discharge-rate is excessive, therefore 5. the electric discharge latter stage equivalent resistance in view of battery is bigger than normal
It needs to use low discharging current instead, blanking voltage 2.2V is discharged to 0.01C current versus cells.
6. shelving 10 minutes.
7. repeat step 5,60 times.
8. electric discharge evaluation and test terminates.
Fig. 3 is evaluated and tested in step discharges to the lithium iron phosphate dynamic battery of some 20Ah according to the electric discharge that designs above
The experimental data of resistance assessment test.It can be seen that cell voltage test start when for 3.5V or so, after entering step 1 with
The constant current of 0.5C, the constant voltage of 3.7V charge the battery, and cell voltage rises rapidly, up to 3.7V and charge
Electric current reaches 0.033C, this step is in order to which battery capacity to be full of.After step 1 is shelved, in step 2 with 0.5C electric currents to electricity
Tank discharge 5 minutes, cell voltage declines rapidly.During step 3 is shelved, battery is since overpotential characteristic, voltage can slowly rise, directly
To stabilization.And the voltage at the end of step 2 and the difference in voltage at the end of step 3 caused by equivalent electric discharge internal resistance precisely due to surpass
The concrete numerical value of potential, utilizes formula（Four）, with this numerical value divided by discharge current, so that it may to calculate equivalent electric discharge internal resistance.
2,3 steps are repeated, the electricity that battery is released can gradually increase, and cell voltage is also gradually reduced, while can be obtained by multiple SoC
Under corresponding equivalent electric discharge internal resistance.Again because theoretically being discharged with 0.5C, battery is needed from the state that is completely filled with to state is allowed to dry
120 minutes time, 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 electricity
Pond can be as possible allowed to dry with 0.5C electric currents, this number repeated is increased to 30 times from 24 times.Step 5 to 7 is with the small electricity of 0.033C
Stream carries out reignition to battery, is difficult to be allowed to dry battery when discharge-rate is excessive because electric discharge latter stage equivalent internal resistance is bigger than normal, institute
In order to ensure battery being vented as possible, to use low discharging current instead.So far, can obtain corresponding to battery difference SoC etc.
Effect electric discharge internal resistance.
C. the equilibrium potential curve and equivalent internal resistance curve that acquisition will be tested in step b, utilize formula
EMFSoC=IWork*rSoC+UL（One）,
Wherein, IWorkIt is electric discharge operating current, ULIt is discharge cut-off voltage, SoC is lithium-ion-power cell state-of-charge,
EMFSoCIt is the equilibrium potential corresponding to a SoC values, rSoCIt is the equivalent internal resistance corresponding to a SoC values；Different SoC values are taken respectively
Corresponding EMF is obtained according to equilibrium potential curve and equivalent internal resistance curveSoCAnd rSoC, and by EMFSoCAnd rSoCSubstitute into formula（One）
In.
D. in general it is to carry out substitution calculating in the way of from right to left by SoC, always has corresponding to unique SoC values
EMFSoCAnd rSoCIt disclosure satisfy that formula（One）, and the SoC values recorded at this time are SoCWork, substitute into formula
η=100%-SoCWork（Two）,
Wherein, η is capacity coefficient, then capacity coefficient is substituted into formula
Q=Q’*η （Three）,
Wherein, Q is the actually available capacity of lithium-ion-power cell, and Q ' is lithium-ion-power cell raw capacity；According to lithium
The actually available capacity Q of ion battery carries out echelon screening to lithium-ion-power cell.
In order to further increase the consistency for the lithium-ion-power cell that combo uses, according to lithium-ion-power cell reality
After active volume Q carries out echelon screening to lithium-ion-power cell, calculated using bad under operating condition according still further to following formula
Change degree carries out secondary echelon screening using degradation to lithium-ion-power cell,
SOH（r’ SoC）=（r’ SoC -rnew）/（rold-rnew）（Seven）,
Wherein, r ' SoCIt is the practical internal resistance of lithium-ion-power cell under running conditions, rnewIt is lithium-ion-power cell
Nominal discharge internal resistance, roldElectric discharge internal resistance when being preset lithium-ion-power cell life termination.
Practical application example is provided below as the method for above-mentioned echelon screening.
Case 1：Assuming that certain batch of vehicle-mounted retired lithium-ion-power cell is applied in the energy storage electric cabinet of computer room by certain client,
The working condition requirement of proposition is to release the capacity of 85Ah under 30 DEG C of operating temperature and the operating current of 30A.
Specific combo implementation steps are as follows：
（1）Fractionation and prescreening are carried out to on-vehicle battery first；
（2）Electric discharge evaluation and test is done to this batch of single battery, the specific work step of evaluation and test refers to work step b, c, d, wherein evaluating and testing temperature
TEvaluation and testIt is 20 DEG C, IEvaluation and testFor 0.5C, corresponding equivalent internal resistance spectral curve and balance potential curve are obtained；
（3）30 DEG C of operating temperature and operating current 30A that client proposes are substituted into formula（One）In, find out each monomer electricity
Pond meets the SoC values of condition, then finds out the actual capacity Q values corresponding to each single battery；
（4）It is less than the single battery of the capacity 85Ah of customer requirement for Q values, remains to be used for other low ranges or low appearance
The battery that amount requires utilizes occasion；It is higher than the single battery of 85 Ah for available capacity, battery is divided using 5Ah as step
Group and assembly, such as the battery group by Q values between 85 ~ 90Ah, and so on.
Case 2：The battery applications environment and power demand that client is proposed inherently carry echelon requirement, such as certain client
By vehicle-mounted retired battery applications in more occasions.Its working condition requirement proposed is the work of operating temperature and 30A at 30 DEG C
Under electric current, the capacity of 90Ah can be released；The capacity of 85Ah can be released under 30 DEG C and 20A of operating mode；In 20 DEG C and the operating mode of 20A
The lower capacity ... that can release 83Ah.
So during specific combo, step（1）~（2）Ibid；
（3）Temperature and electric current under the various working conditions that client is proposed substitute into formula（One）In, find out each monomer
Actual capacity Q of the battery 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 is rejected；
（5）If the available capacity Q of a certain batteryiValue meets more step working condition requirements, then is classified as under these operating modes
Candidate battery；
（6）If the available capacity Q of a certain batteryiValue only meets wherein a certain working condition requirement, then it is the operating mode to be filed
Under echelon utilize battery；
（7）The echelon proposed according to client requires to be grouped battery, to battery cell number under Mr. Yu's operating mode
Insufficient situation can supplement the candidate single battery corresponding to the working condition and complete combo.
To sum up, according to the battery testing group gas-mixing screening scheme proposed, the volume battery filtered out can be carried out combo with
Realize that echelon utilizes so that the utilization of resources of waste and old power battery may be implemented to maximize.
Claims (5)
1. lithium-ion-power cell echelon utilizes analysis method, it is characterised in that include the following steps：
A. prescreening is carried out to lithium-ion-power cell to be analyzed；
B. the use operating condition that the lithium-ion-power cell through prescreening is provided according to user, including work temperatureWorkAnd it puts
Electric operating current IWork, determine corresponding electric discharge evaluation and test condition, including electric discharge evaluation and test temperature TEvaluation and testAnd fixed discharge-rate IEvaluation and test
Electric discharge evaluation and test is carried out to lithium-ion-power cell and obtains equilibrium potential curve and equivalent internal resistance curve；
C. formula EMF is utilizedSoC=IWork*rSoC+UL（One）,
Wherein, IWorkIt is electric discharge operating current, ULIt is discharge cut-off voltage, SoC is lithium-ion-power cell state-of-charge, EMFSoC
It is the equilibrium potential corresponding to a SoC values, rSoCIt is the equivalent internal resistance corresponding to a SoC values；
Different SoC values are taken to obtain corresponding EMF according to equilibrium potential curve and equivalent internal resistance curve respectivelySoCAnd rSoC, and will
EMFSoCAnd rSoCSubstitute into formula（One）In；
D. until formula（One）Met, and the SoC values recorded at this time are SoCWork, substitute into formula
η=100%-SoCWork（Two）,
Wherein, η is capacity coefficient, then capacity coefficient is substituted into formula
Q=Q’*η （Three）,
Wherein, Q is the actually available capacity of lithium-ion-power cell, and Q ' is lithium-ion-power cell raw capacity；According to lithium ion
The actually available capacity Q of power battery carries out echelon screening to lithium-ion-power cell.
2. lithium-ion-power cell echelon according to claim 1 utilizes analysis method, it is characterised in that：In step b
Electric discharge evaluation and test includes the following steps：
B1. in fixed evaluation and test temperature TEvaluation and testUnder lithium-ion-power cell charge until be completely filled with；
B2. with fixed discharge-rate IEvaluation and testConstant-current discharge is carried out to lithium-ion-power cell, and continues the discharge time of setting；
If the voltage of lithium-ion-power cell is less than discharge cut-off voltage in discharge time, b4 is entered step, b3 is otherwise entered step；
B3. it keeps lithium ion battery in the state of shelving, continues for some time, be then back to step b2；
B4. utilize trickle to lithium-ion electric tank discharge until emptying completely；
B5. it keeps lithium ion battery in the state of shelving, continues for some time, test terminates；
The voltage and current data that each moment is recorded in test process pick and place before electricity terminates last to each active section b2
It is the discharge voltage U under the SoC levels to carve corresponding voltageSoC, a section b3 is shelved to each, standing is taken to be corresponded at the last moment before terminating
Voltage is the equilibrium potential EMF under the SoC levelsSoC, substitute into following formula
rSoC=（EMFSoC-USoC）/IEvaluation and test（Four）,
Calculate the equivalent internal resistance r obtained under the SoC levelsSoC, the equivalent internal resistance under different SoC is utilized into fitting or the side of interpolation
Formula obtains equivalent internal resistance curve.
3. lithium-ion-power cell echelon according to claim 1 utilizes analysis method, it is characterised in that：The work temperature
Spend TWorkWith electric discharge evaluation and test temperature TEvaluation and testIt is identical.
4. lithium-ion-power cell echelon according to claim 1 utilizes analysis method, it is characterised in that：Work as operating temperature
TWorkWith electric discharge evaluation and test temperature TEvaluation and testWhen different, EMFSoCWith rSoCIt is converted according to following formula,
EMF’SoC=EMFSoC*βTemperature（Five）,
r’SoC=rSoC*αTemperature（Six）,
Wherein βTemperatureAnd αTemperatureRespectively EMFSoCAnd rSoCTemperature coefficient, by formula（One）In EMFSoCReplace with EMF 'SoC,
rSoCReplace with r 'SoC。
5. lithium-ion-power cell echelon according to claim 4 utilizes analysis method, it is characterised in that：According to lithium ion
After the actually available capacity Q of power battery carries out echelon screening to lithium-ion-power cell, is calculated according still further to following formula and use work
Degradation under the conditions of work carries out secondary echelon screening using degradation to lithium-ion-power cell,
SOH（r’ SoC）=（r’ SoC -rnew）/（rold- rnew）（Seven）,
Wherein, r ' SoCIt is the practical internal resistance of lithium-ion-power cell under running conditions, rnewIt is the specified of lithium-ion-power cell
Electric discharge internal resistance, roldElectric discharge internal resistance when being preset lithium-ion-power cell life termination.
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