CN107843852B - A method of off-line data is obtained to estimate battery united state - Google Patents
A method of off-line data is obtained to estimate battery united state Download PDFInfo
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- CN107843852B CN107843852B CN201711329175.7A CN201711329175A CN107843852B CN 107843852 B CN107843852 B CN 107843852B CN 201711329175 A CN201711329175 A CN 201711329175A CN 107843852 B CN107843852 B CN 107843852B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention discloses a kind of acquisition off-line datas come the method for estimating battery united state.This method by relationship S=p (T) of the capacity S about temperature T, coulomb coefficient k the relationship k=q (T) about temperature T, capacity S with temperature T variation ratio r=p (T)/S0=w (T)；SOC during constant-current charge voltage slope curve characteristic point D1-D4 counting cell charging corresponding with SOC: being 0~A according to SOCC、ADThe OCV and SOC and corresponding relationship SOC=s (OCV, T) of temperature calculates SOC when battery does not work in~100% section.This method can provide required data for this state joint estimating algorithm and support, provide multiple specific characteristic values for state estimation, to improve state estimation precision, reduce the calculation amount of estimation.
Description
Technical field
The present invention relates to a kind of acquisition off-line datas come the method for estimating battery united state, is suitable for but is not limited to phosphorus
Sour lithium iron battery, state estimation pass through offline more particularly to battery capacity estimation and battery charge state (SOC) estimation, the present invention
Lithium-ions battery, analysis and extraction characteristic are tested, carries out state estimation in conjunction with the method for online feature identification.
Background technique
In the application field of domestic electrical vehicular power lithium-ions battery, the occupation rate of LiFePO4 about 50%, in reality
In use, battery management system is larger to the capacity and SOC estimation error of ferric phosphate lithium cell, causes electric vehicle continuation of the journey and estimate
Mistake is driven and experiences poor, and the estimation error of SOC will lead to battery management maloperation to influence battery life.
Ferric phosphate lithium cell has Width funtion platform, very gentle in voltage platform of the SOC in 20%~85% section,
End voltage change is even less than 1mV when SOC variation 1%, therefore very difficult based on end voltage progress SOC estimation.
Ferric phosphate lithium cell capacity is gradually decayed with recycling number increase, but can not carry out capacity in use
Canonical measure, it is therefore desirable to pass through in use, on-line identification be carried out to battery capacity, online capacity is estimated in the industry at present
It is low to calculate arithmetic accuracy.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of method for obtaining off-line data to estimate battery united state, it should
Algorithm is suitable for but is not limited to ferric phosphate lithium cell, this algorithm is by into specific working condition measurement, extracting different battery
The shared characteristic of temperature, different degree of aging, different batches production battery carries out capacity and SOC using characteristic online
Identification ensure that the precision of state estimation, in addition, this algorithm calculation amount is small, especially suitable for more while simplifying calculation amount
The state joint estimation that each single battery is carried out in series-connected cell group, is formulated for united state estimating algorithm of the present invention
Dedicated off-line data test method, the test method is simplified and has standardized testing process, illustrates the method for data acquisition,
It is the basis of united state estimation；
The shared characteristic that battery testing of the present invention extracts is to have passed through the conclusion obtained after great amount of samples test, is surveyed
The correctness of method for testing and result has been verified；
Off-line data with a batch of lithium-ions battery can be only applied to the batch battery, be not useable for different batches
The lithium-ions battery of secondary, different manufacturers lithium-ions batteries or other materials system, this method are applicable to ferric phosphate
Lithium battery and the battery with the Wide Worktable similar with phosphoric acid iron cell；
Specifically, the battery status evaluation method needs to obtain the off-line data of sample battery, sample battery
Off-line data obtains test method are as follows: (a) cyclic charging and discharging test, with certain steady temperature T under insulating box environment, with IaElectric current
Carry out constant-current constant-voltage charging, blanking voltage Ua, charging capacity is recorded, 2h is stood, with IbElectric current carries out constant-current discharge, cut-off electricity
Pressure is Ub, discharge capacity is recorded, 2h is stood, cycle charge-discharge to adjacent discharge capacity twice is differed less than 0.5%, then recorded most
A charging capacity S afterwardsaWith discharge capacity Sb, calculate coulomb coefficient k=Sb/Sa, record last time charging voltage UeWith charging
Homologous thread data U between electricity se=f (s), by SaAs battery capacity, the relationship f of the electricity s of voltage U when charging is turned
It is changed to the relationship g of voltage U and SOC, obtains Ue=g (SOC), by h=g ', i.e. slope of the voltage U about SOC is calculated,
ΔUe=h (SOC)；(b) with 1/50C multiplying power constant-current charge to blanking voltage Ua, after standing 5h, extremely with 1/50C multiplying power constant-current discharge
Blanking voltage Ub, the corresponding data of recording voltage and electricity, makes charging voltage U respectively respectivelyc, discharge voltage UdIt is corresponding with SOC
Curve Uc=vc(SOC)、Ud=vd(SOC), OCV (open-circuit voltage) curve, OCV=v (SOC) are obtained；(c) change constant temperature box temperature
Degree repeats step a and b, respectively recording capacity, coulomb coefficient, constant-current charge voltage UeWith electricity s curve Ue=g (SOC) and OCV
Curve OCV=v (SOC)；
In above-mentioned test process, the blanking voltage U of charge and dischargeaAnd UbIt is determined by battery manufacturer according to actual use value, charge and discharge
Electric current IaAnd IbIt is determined by the actual use operating condition of battery, wherein charging current IaIt should be with actual constant-current charge electric current phase
Deng；
Further, test temperature is set according to the actual use temperature range of battery, such as certain batteries of electric automobile fills
Discharge range is T1~Tn, n temperature spot is uniformly chosen in this section and is tested, and the selection of n determines the essence of off-line data
Degree, test the data obtained are as follows:
For the versatility for guaranteeing data, off-line data is multiple sample data mean values, and the characteristic of extraction is as follows:
Data are 1.: relationship S=p (T) of the capacity S about temperature T, relationship k=q (T) of the coulomb coefficient k about temperature T, and
According to maximum capacity S on S=p (T) curve0With corresponding temperature T0, capacity S is obtained with variation ratio r=p (T)/S of temperature T0
=w (T)；
Data are 2.: constant-current charge voltage slope curve characteristic point D1-D4 corresponding with SOC, i.e., under different temperatures, SOC is
A1First turning point D1, SOC A of slope when place2Second turning point D2 when place, slope are less than U0Section it is corresponding into point and
Point D3 and D4 out, wherein D3 and D4 are with U0Size and change, U0For setting value, D3 and the corresponding SOC of D4 are A3And A4；
Data are 3.: being 0~A according to SOCC、ADThe corresponding relationship of OCV and SOC and temperature, OCV=v in~100% section
(SOC, T), conversion obtain SOC=s (OCV, T), wherein AC、ADFor SOC at the starting and ending of OCV voltage platform；
The above are the characteristics of test result, are stored in the read-only memory of battery management system, when on-line operation
Characteristic will be used to carry out united state estimation；
State joint evaluation method of the present invention based on off-line data driving be integrated with ampere-hour based on, in feature
SOC correction is carried out at point, it is real-time to battery capacity according to the capacity variation with temperature ratio r=w (T) and observed temperature of acquisition
It updates, and over numerous cycles according to characteristic value and ampere-hour integral to maximum capacity S0It is corrected；
Further according to the battery temperature of actual measurement, in battery with IaDuring electric current carries out constant-current charge, battery-end is monitored
Voltage, according to voltage UeSlope Δ U about SOCe=h (SOC) calculates cell voltage slope, when discovery monitoring voltage slope symbol
When closing the wherein characteristic point of some in aforementioned four characteristic point D1-D4, current time is corrected according to offline characteristic value
SOC, even if present battery SOC be equal to the moment characteristic value under SOC.
Further, when battery is not at charging and discharging state, according to the battery temperature of actual measurement, after measured battery is stood
Voltage is OCV, substitutes into the SOC that SOC=s (OCV, T) tables look-up when obtaining standing.
Specifically, characteristic point can be divided into three parts: constant-current charge characteristic point, charging terminate rear end voltage change and
Electric discharge terminates rear end voltage change；
The constant-current charge characteristic point is, in charging, to test identical fixed current IaConstant-current charge is first carried out, electricity
The initial SOC in pond not necessarily 0, charge cutoff point is filled using the charging of other electric currents or constant pressure after voltage is reached or do not reached
Electricity, is concerned only with constant-current charging phase voltage data, and when since charging record current ampere-hour integrated value A, when detecting spy
When levying point D1~D4, corresponding ampere-hour integrated value s is recorded respectively1~s4And corresponding SOC value A1~A4；
Further, feature point detecting method are as follows: each is fixed in duration Δ t, is taken mean value to cell voltage, is calculated phase
The average voltage of two Δ t of neighbour is poor, and the voltage value Δ U of every 1%SOC variation is gone out according to charging current Equivalent Calculatione, track Δ Ue
Two peak turning points D1 and D2, record corresponding ampere-hour integrated value s1And s2；It records Δ U incoming and outgoing and is less than U0Section
The corresponding ampere-hour integrated value s of two characteristic points D3 and D43And s4；
The charging terminates rear end voltage change, and after this charging, recording voltage falls curve after rise, if filled
Time of repose after electricity falls short of, i.e., time of repose is less than te, teSize set according to battery behavior, then pass through voltage
Expected stationary value is calculated in falling trend, i.e., equivalent OCV, if time of repose long enough, i.e. time of repose are greater than te, then remember
Voltage after standing is OCV, table look-up SOC=s (OCV, T) is carried out further according to temperature T, if voltage in this section, can obtain
Must charge the SOC value A terminated5, record ampere-hour integrated value s at this time5；
The electric discharge terminates rear end voltage change, after upper primary electric discharge, recording voltage rise curve, if
Time of repose after electric discharge falls short of, i.e., time of repose is less than te, then it is calculated by voltage recovery trend expected steady
Definite value, i.e., equivalent OCV, if time of repose long enough, i.e. time of repose are greater than te, then remember that the voltage after standing is OCV, then root
Table look-up SOC=s (OCV, T) is carried out according to temperature T, if voltage in this section, can obtain the SOC value A that electric discharge terminates0, this
When ampere-hour integrated value be s0=0.
A kind of calculation method of lithium-ions battery united state estimation based on off-line data driving of the present invention
It has the advantage that
1. calculating simply, based on addition subtraction multiplication and division method, calculation amount is small；
2. being based on test data and feature identification, there is specific aim, estimation precision is high；
3. the state identification for each single battery being suitable in big number of tandem battery pack.
Detailed description of the invention
Fig. 1 is the process of the battery off-line test in the present invention；
Fig. 2 is the OCV test curve obtained in the present invention；
Fig. 3 is voltage change curve after the charging and discharging in the present invention；
Fig. 4 is the determination method of the constant-current charge voltage slope curve in the present invention and characteristic value；
Fig. 5 is the flow chart of the presence joint estimate in the present invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
Fig. 1 is the flow chart of battery off-line test applied by the method for the present invention.As shown in Figure 1, it is first determined n test
Temperature spot T1~Tn, at each temperature, volume test cyclic charging and discharging test and open-circuit voltage test are carried out respectively, and record
With processing corresponding data, specific testing procedure is as follows: (a) with certain steady temperature T under insulating box environment, with IaElectric current carries out permanent
Flow constant-voltage charge, blanking voltage Ua, charging capacity is recorded, 2h is stood, with IbElectric current carries out constant-current discharge, blanking voltage Ub,
Discharge capacity is recorded, 2h is stood, cycle charge-discharge to adjacent discharge capacity twice is differed less than 0.5%, then records last time
Charging capacity SaWith discharge capacity Sb, calculate coulomb coefficient k=Sb/Sa, record last time charging voltage UeWith charge capacity s it
Between corresponding data Ue=f (s), by SaAs battery capacity, by the relationship f of the electricity s of voltage U when charging be converted to voltage U with
The relationship g of SOC, obtains Ue=g (SOC), by h=g ', i.e. slope of the voltage U about SOC, Δ U is calculatede=h (SOC)；
(b) with 1/50C multiplying power constant-current charge to blanking voltage Ua, after standing 5h, with 1/50C multiplying power constant-current discharge to blanking voltage Ub, point
The corresponding data of other recording voltage and electricity, makes charging voltage U respectivelyc, discharge voltage UdWith SOC homologous thread Uc=vc
(SOC)、Ud=vd(SOC), mean value is taken to charging and discharging curve, obtains OCV curve, OCV=v (SOC)；(c) change constant temperature box temperature
Degree repeats step a and b, respectively recording capacity, coulomb coefficient, constant-current charge voltage U and electricity s curve Ue=g (SOC) and OCV
Curve OCV=v (SOC)；
In test process, the blanking voltage U of charge and dischargeaAnd UbIt is determined by battery manufacturer according to actual use value, charge and discharge electricity
Flow IaAnd IbIt is determined by the actual use operating condition of battery, wherein charging current Ia should be equal with actual constant-current charge electric current；
Test the data obtained can be obtained after treatment:
(a) data are fitted the relationship S=p (T) for obtaining capacity S about temperature T, relationship k of the coulomb coefficient k about temperature T
=q (T)；
(b) constant-current charge voltage slope characteristic point corresponding with SOC: under different temperatures, SOC A1The first of Δ U at point
Turning point D1, SOC A2Locate the second turning point D2, Δ U is less than U0Section it is corresponding into put and go out point D3 and D4, wherein D3 with
D4 is with U0Size and change, D3 and the corresponding SOC of D4 are A3And A4；
It (c) is 0~A in SOCC、ADThe corresponding relationship of OCV and SOC and temperature in~100% section, OCV=v (SOC, T),
Conversion obtains SOC=s (OCV, T)；
Fig. 2 is the test curve obtained of OCV applied by the method for the present invention.As shown in Fig. 2, bright in first and last end voltage change
Aobvious, but voltage platform occur in centre, voltage change is small, and Cong Tuzhong tables look-up acquisition it may be concluded that carrying out OCV at first and last end
SOC value precision is higher, therefore extracts SOC in 0~A from battery testing test dataC、ADIn~100% section OCV and SOC and
The corresponding relationship of temperature, OCV=v (SOC, T), conversion obtain SOC=s (OCV, T), are used for OCV computation of table lookup SOC；
Fig. 3 is voltage change curve after test applied by the method for the present invention is charged and discharged.It can from figure
Out, after charging, polarizing voltage is gradually decrease to 0, and battery terminal voltage is fallen after rise to OCV, and after electric discharge, polarizing voltage is gradually
It is reduced to 0, battery terminal voltage gos up to OCV, a period of time t after battery charge or dischargecIt is interior, record charging respectively
After initial time cell voltage UC0, t moment cell voltage UC1, the 2t moment cell voltage UC2, after record electric discharge
Initial time cell voltage UD0, the cell voltage U of t momentD1, the cell voltage U at 2t momentD2, calculated separately by above data
The equivalent OCV of battery, calculation method are as follows after being charged and discharged out:
According to single order equivalent-circuit model, i.e. battery terminal voltage is equal to the sum of OCV, internal resistance pressure drop and polarizing voltage, stands
Under state, internal resistance pressure drop is 0, therefore battery terminal voltage is equal to the sum of OCV and polarizing voltage, the then mathematical modulo being charged and discharged
Type:
Wherein UCFor the battery terminal voltage after charging, UDFor the battery terminal voltage after electric discharge, UOCVFor open circuit electricity
Pressure value, UpFor polarizing voltage, battery is in static condition, and polarization time constant is fixed, and is set as τ, polarizing voltageWherein Up0For initial polarizing voltage；
After charging:
Wherein, Up0For initial polarization voltage, it is calculated:
Therefore it obtains:
After similarly discharging:
Wherein, Up0For initial polarization voltage, it is calculated:
Therefore it obtains:
Fig. 4 is the determination method of constant-current charge voltage slope curve and characteristic value applied by the method for the present invention.It is bent in figure
Line is the test result at a temperature of certain, with fixed current IaFirst carry out constant-current charge, the initial SOC of battery not necessarily 0, in voltage
Charge cutoff point is concerned only with constant-current charging phase voltage number using the charging of other electric currents or constant-voltage charge after reaching or not reaching
According to, and since charging when record current ampere-hour integrated value A recorded respectively corresponding when detecting characteristic point D1~D4
Ampere-hour integrated value s1~s4And corresponding SOC value A1~A4；
4 feature point detecting methods are as follows: each is fixed in duration Δ t, is taken mean value to cell voltage, is calculated two neighboring
The average voltage of Δ t is poor, and the voltage value Δ U of every 1%SOC variation is gone out according to charging current Equivalent Calculatione, track Δ UeTwo
Peak turning point D1 and D2 record corresponding ampere-hour integrated value s1And s2；Record Δ UeIncoming and outgoing is less than U0Section two spies
Levy the corresponding ampere-hour integrated value s of point D3 and D43And s4, U0The determination of value affects the position of D3 and D4；
Fig. 5 is the flow chart of presence joint estimate applied by the method for the present invention.Presence joint estimate difference
It is executed in main program and timer interrupt routine, as shown, dash area program executes in main program, it is predominantly equivalent
The joint estimate and correction of the calculating of OCV and battery capacity and SOC, remaining is executed in Interruption, predominantly charge and discharge
Characteristic point identification in the ampere-hour integral calculation and charging process of journey, specific process are as follows:
Before charging, the time stood after the last electric discharge of record first, if time of repose is longer, that is, when standing
Between be greater than te, then using the battery terminal voltage measured before charging as OCV value, if time of repose is shorter, i.e., time of repose is small
In te, then using electric discharge after the voltage change data that store calculate OCV value, then carry out table look-up SOC=s (OCV, T), obtain
SOC before charging carries out ampere-hour integral calculation to charging current, and carry out characteristic point in constant-current charging phase during the charging process
Identification, records the corresponding SOC value A of characteristic point of identificationnWith ampere-hour integrated value sn, at the end of charging, a period of time after record end
Interior voltage change records duration depending on actual conditions in engineer application；
Further, characteristic value discrimination method during constant-current charge are as follows: become according to every 1%SOC at the k moment is calculated
The voltage value Δ U of changek, when SOC is near 19%, Δ Uk-1<ΔUkAnd Δ Uk>ΔUk+1, then it is D1 point at the k moment, works as SOC
When near 76%, Δ Uk-1<ΔUkAnd Δ Uk>ΔUk+1, then it is D2 point at the k moment, when occurring Δ U for the first timek<U0Shi Jilu k
Moment is D3 point, Δ U occurs in constant-current charging phase last timek<U0The Shi Jilu k moment is D4 point；
Before electric discharge, the time stood after the last charging of record first, if time of repose is longer, that is, when standing
Between be greater than te, then using the battery terminal voltage measured before electric discharge as OCV value, if time of repose is shorter, i.e., time of repose is small
In te, then using charging after the voltage change data that store calculate OCV value, then carry out table look-up SOC=s (OCV, T), obtain
SOC at the end of charging carries out ampere-hour integral calculation and obtains SOC during the charging process；
Every time since charging to electric discharge start segment in, due to charging starting and ending when SOC do not know
Property, most available 6 characteristic points, when obtaining 2 or features above point, so that it may according to the calculation formula of capacityObtain volumetric correction value, multiple volumetric correction values can be calculated in multiple cyclic processes, to calibration value into
After row median calculation and mean value computation, battery capacity is corrected.
The present invention is not only limited to above-mentioned specific embodiment, and persons skilled in the art are according to embodiment and attached drawing public affairs
Open content, the present invention can be implemented using other a variety of specific embodiments, therefore, it is all using design structure of the invention and
Thinking does the design of some simple transformation or change, both falls within the scope of protection of the invention.
Claims (2)
1. a kind of method for obtaining off-line data to estimate battery united state, the acquisition off-line data include, first really
Determine n test temperature point T1~Tn, under each temperature spot, volume test cyclic charging and discharging test and open-circuit voltage are carried out respectively
Test, and record and processing corresponding data, the specific steps are as follows: (a) under insulating box environment with certain steady temperature T, with IaElectricity
Stream carries out constant-current constant-voltage charging, charge cutoff voltage U to batterya, charging capacity is recorded, 2h is stood；With IbElectric current is to storage
Battery carries out constant-current discharge, discharge cut-off voltage Ub, record discharge capacity standing 2h；Recycle charge and discharge to it is adjacent twice
When the difference of discharge capacity is less than 0.5%, last time charging capacity S is recordedaWith discharge capacity Sb, calculate coulomb coefficient k=Sb/
Sa, record the voltage U of battery in last time chargingeCorresponding data U between charge capacity se=f (s)；(b) with 1/50C
Multiplying power constant current charges to blanking voltage U to batterya, after standing 5h, cut-off electricity is discharged to battery with the constant current of 1/50C multiplying power
Press Ub, the corresponding data of recording voltage and electricity, makes charging voltage U respectively respectivelyc, discharge voltage UdWith SOC homologous thread Uc
=vc(SOC)、Ud=vd(SOC)；(c) change calorstat temperature, repeat step a and b, record last time charging capacity respectively
Sa, coulomb coefficient k, constant-current charge voltage UeWith electricity s curve Ue=f (s) and charging voltage Uc, discharge voltage UdIt is corresponding with SOC
Curve Uc=vc(SOC)、Ud=vd(SOC)；
By T1~TnTotal n temperature spot and corresponding battery last time charging capacity SaDiscrete data (T1,Sa1)、(T2,
Sa2)、…、(Tn,San) carry out curve fitting to obtain S=p (T), and according to maximum capacity S on S=p (T) curve0With corresponding temperature
Spend T0And then accumulator capacity S is calculated with variation ratio r=p (T)/S of temperature T0=w (T), by T1~TnTotal n temperature
Discrete data (the T of point and coulomb coefficient k1,qa1)、(T2,qa2)、…、(Tn,qan) carry out curve fitting to obtain k=q (T)；
It has been obtained by test in T1~TnUnder total n temperature spot, last time charging voltage UeWith pair between charge capacity s
Answer curve data Ue=f (s), at each temperature, by last time charging capacity SaAs battery capacity, by voltage when charging
UeVoltage U is converted to the relationship f of electricity seWith the relationship g of SOC, U is obtainede=g (SOC) is filled by h=g ' is calculated
Piezoelectric voltage UeSlope curve Δ U about SOCe=h (SOC) obtains characteristic point D1-D4 corresponding with SOC on the slope curve,
Wherein the determination method of the first turning point D1 is, is 19% vicinity in SOC, the peak point of curve is D1, is recorded corresponding
SOC value is A1；The determination method of second turning point D2 is, is D2 in the peak point that SOC is 76% vicinity curve, record pair
The SOC value answered is A2, make Δ U on curvee=U0Straight line, wherein U0For setting value, with slope curve Δ Ue=h (SOC) phase
The two o'clock of friendship, the lesser point of SOC are D3, and recording corresponding SOC value is A3, the biggish point of SOC is D4, records corresponding SOC value
For A4；
It has been obtained by test in T1~TnUnder total n temperature spot, battery charging voltage Uc, discharge voltage UdIt is corresponding with SOC bent
Line Uc=vc(SOC)、Ud=vd(SOC), mean value is taken to two curves of charge and discharge, obtains OCV curve, it may be assumed that OCV=(vc(SOC)+
vd(SOC))/2=v (SOC)；It is 0~A in SOCC、AD~100% section, to curve OCV=v corresponding at all temperature
(SOC) surface fitting is carried out, is obtained data OCV=v (SOC, T), conversion obtains SOC=s (OCV, T), wherein AC、ADFor OCV electricity
SOC at the starting and ending of flattening bench；
Relationship k about temperature T of relationship S=p (T) and coulomb coefficient k according to observed temperature, using capacity S about temperature T
=q (T) corrects the capacity and coulomb coefficient of battery, when temperature changes, is tabled look-up more according to r=w (T) and k=q (T)
New present battery capacity and coulomb coefficient；
Further according to the battery temperature of actual measurement, in battery with IaDuring electric current carries out constant-current charge, battery terminal voltage is monitored,
According to voltage UeSlope Δ U about SOCe=h (SOC) calculate cell voltage slope, when discovery monitoring voltage slope meet it is above-mentioned
When the wherein characteristic point of some in four characteristic point D1-D4, the SOC at current time is corrected according to offline characteristic value,
Even if the SOC for obtaining present battery is equal to the SOC under the characteristic value at the moment.
2. the method according to claim 1 for obtaining off-line data to estimate battery united state, which is characterized in that when
When battery is not at charging and discharging state, according to the battery temperature of actual measurement, the voltage after measured battery is stood is OCV, substitutes into SOC=
The SOC that s (OCV, T) tables look-up when obtaining standing.
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| CN109632138B (en) * | 2018-11-08 | 2020-08-28 | 江苏大学 | Online estimation method of battery internal temperature based on charging voltage curve |
| CN109633463A (en) * | 2018-11-28 | 2019-04-16 | 上海松岳电源科技有限公司 | A kind of SOC appraisal procedure based on single battery electrokinetic cell system |
| CN109515251B (en) * | 2018-12-26 | 2021-07-23 | 中国船舶重工集团公司第七一九研究所 | Lithium battery pack balance control method for hybrid power |
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| US11592493B2 (en) * | 2020-01-15 | 2023-02-28 | GM Global Technology Operations LLC | Method and system for battery capacity estimation using voltage slope capacity and dynamic anchors |
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