CN109683101A - A method of battery remaining power is obtained based on SOC-OCV curve - Google Patents
A method of battery remaining power is obtained based on SOC-OCV curve Download PDFInfo
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Abstract
The invention discloses a kind of methods for obtaining battery remaining power based on SOC-OCV curve, belong to automobile batteries field.It includes the following steps: S1, temperature collection-rated capacity curve, the SOC-OCV curve under temperature-gross energy curve and different temperatures；S2, the SOC- dump energy curve under different temperatures is obtained；S3, the SOC- dump energy curve under different temperatures is input in BMS program；S4, it is inquired according to bivariate table, obtains real-time dump energy.Present invention firstly provides the integrals for calculating the energy released using SOC-COV curve to obtain the dump energy of battery, and then obtains the residual energy of the battery under different temperatures and SOC.The present invention only needs to test most basic battery behavior, and accurate dump energy can be obtained, and reduces the workload of battery testing, can be realized and obtains real-time battery remaining power in vehicle operation.
Description
Technical field
The invention belongs to automobile batteries fields, specifically, being related to a kind of based on SOC-OCV curve acquisition remaining battery energy
The method of amount.
Background technique
Power battery is the device that chemical energy is switched to electric energy, and conversion process is a complicated physical-chemical reaction mistake
Journey, and calculate the dump energy of power battery, for estimating the remaining driving mileage of electric car, avoid because vehicle it is out of power without
It can travel and there is vital meaning to Vehicular charging etc. in time.
SOC, full name are State of Charge, and state-of-charge is numerically fixed for reflecting the residual capacity of battery
Justice is the ratio that residual capacity accounts for battery capacity.SOC-OCV curve be generally used to estimation SOC value, mainly according to the OCV of battery with
Variation relation between inside battery lithium concentration fits its one-to-one relationship between battery SOC, i.e., indirectly
There are certain functional relations between the electromotive force of battery and the SOC of battery, it is possible thereby to by open-circuit voltage measure from
And obtain the SOC value of battery.
Dump energy indicates that battery is capable of the energy of cumulative release from current time to electric discharge cut-off time, and existing obtains
Dump energy method is generally divided into following several: (1) utilizing formula E=SOC × Q0×Ubat× SOH estimates power battery
Dump energy, wherein E indicates the dump energy of power battery, and SOC (State of Charge) indicates the current lotus of battery pack
Electricity condition, Q0Indicate the rated capacity of battery, UbatThe voltage of battery pack, SOH (Section Of Health) indicate battery
Health degree.But this method can only battery current time dump energy, with the electric discharge of battery pack, the voltage of battery is increasingly
Low, this method calculates the electric discharge operating condition not looked to the future when dump energy using the voltage at current time, causes calculated result inclined
It is high.(2) it is multiplied to obtain dump energy with SOC with gross energy, the complicated physical chemistry that this method does not account for battery is anti-
It answers, battery pack is not stringent linear relationship in different state-of-charge and utilisable energy.(3) laboratory test obtains battery
Residual energy magnitude at different electric currents, voltage, temperature and SOH establishes dump energy parameter query table, in actual motion mistake
It is tabled look-up in journey according to the real-time current of battery, voltage, temperature and SOH；Carry out a large amount of experiment ability this method early period
Establish one 4 dimension parameter list, the biggish man power and material for needing to release.
Summary of the invention
1, it to solve the problems, such as
Aiming at the problem that existing acquisition dump energy inaccuracy or the related data of acquirement relatively take time and effort, the present invention is mentioned
For a kind of method for obtaining battery remaining power based on SOC-OCV curve.The present invention can be in the essence for guaranteeing calculating dump energy
In the case of degree, computation complexity is reduced, reduces the resource consumption in program operation process.
2, technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
A method of battery remaining power is obtained based on SOC-OCV curve, is included the following steps:
S1, temperature collection-rated capacity curve, the SOC-OCV curve under temperature-gross energy curve and different temperatures；
The dump energy of each SOC corresponding points, obtains different temperatures in SOC-OCV curve under S2, calculating different temperatures
Under SOC- dump energy curve；
S3, the SOC- dump energy curve under different temperatures is input in BMS program；
S4, it is looked into according to the bivariate table of the real-time temperature of battery and the SOC- dump energy of SOC value selection different temperatures
It askes, obtains real-time dump energy.
As prioritization scheme, in step S2, dump energy is obtained by following steps,
S21, the releasing energy UsedEnergy for first calculating battery:
S22, the dump energy LeftEnergy for calculating battery again:
LeftEnergy=(TotalEnergy-UsedEnergy) × SOH formula (2)
In formula (1) and formula (2): UaFor the corresponding voltage of a state-of-charge, UbFor the corresponding voltage of b state-of-charge,
SOCaFor the corresponding SOC of a state-of-charge, SOCbFor the corresponding SOC of b state-of-charge, Q0For rated capacity, TotalEnergy is
The gross energy of battery, SOH are battery health degree.
As prioritization scheme, the siding-to-siding block length range between two state-of-charges of a and b is 5%-10%.
It further include the mistake that self study is carried out to the SOC-OCV curve under different temperatures in step S2 as prioritization scheme
Journey, the specific steps are as follows:
S23, the practical energy discharged of battery is calculated
S24, UsedEnergy is replaced with E, brings formula (2) into, obtains LeftEnergy '；
U is current time voltage, and I is current time electric current, and dt is the task run period for calculating Integrated discharge energy, T1
For full discharge of electricity to the time for the SOC point for needing self study, LeftEnergy0For real surplus energy；
Difference DELTA E between S25, calculating LeftEnergy and LeftEnergy ', when Δ E is greater than 3%
When TotalEnenrgy*SOH, the dump energy LeftEnergy under Current Temperatures and SOC is replaced with into LeftEnergy '.
As prioritization scheme, when SOH is in 80%-99% range, using 1% as interval, starting is bent to different SOC-OCV
Line carries out the process of the self study.
As prioritization scheme, during the self study, when SOC is in 20%-90% range, with 5% or 10% work
T is chosen for interval1Calculate the real surplus energy under different temperatures.
3, beneficial effect
Compared with the prior art, the invention has the benefit that
(1) present invention firstly provides the integrals for calculating the energy released using SOC-COV curve to obtain the residue of battery
Energy, and then the dump energy of the battery under different temperatures and SOC is obtained, these data are input in software, according to battery
Current SOC and temperature table look-up that current remaining can be obtained.It is special that the present invention only needs to test most basic battery
Property, accurate dump energy can be obtained, reduce the workload of battery testing, can be realized in vehicle operation
Obtain real-time battery remaining power.
In the process of moving, actual consumption is the energy content of battery to vehicle, and SOC indicates the remaining ampere-hour number of battery, this hair
The dump energy ratio SOC of bright detection more can accurately predict vehicle remaining mileage.
(2) relative to existing method, the present invention is obtained in the method for UsedEnergy, when due to OCV test the interval SOC compared with
Small, voltage change is little, and the calculated result of UsedEnergy is accurate.The present invention can not only effectively improve the calculating of dump energy
Precision provides accuracy rating 10% or more, moreover it is possible to which the resource reduced in software running process is released.
(3) according to the concept of integral, interval division is more, and precision is higher, but for SOC-OCV curve, if
Interval division is excessive, will increase test job amount.Through a large number of experiments the study found that when the test interval of SOC chooses 5%-10%,
Not only it can guarantee the computational accuracy of dump energy, but also test job amount can be reduced.
(4) due to cell degradation SOC-OCV curve when is different with new battery SOC-OCV curve, will lead to dump energy
Calculating deviation, by self study, the dump energy in each stage of available cell degradation process, to preset value of tabling look-up
It is replaced update, the value that makes to table look-up is consistent with current battery status always, reduces cell degradation bring and calculates deviation.
(5) when SOH is in 80%-99% range, battery starts aging, and SOC-OCV curve at this moment is possible to deviation, is
This deviation is avoided, guarantees that battery software in aging can make a response in time, starts self study process；But self study
Starting cannot excessively frequently, in order to avoid the too many mcu resource of consumption.
Using 1% as time interval, starting carries out the process of the self study to different SOC-OCV curves, both may be used in this way
To reduce the calculation amount of self study, it is updated without the table in real time to temperature, SOC and dump energy, also ensures simultaneously
SOH variation can open self-learning function when smaller, update residual energy scale.
(6)T1Value should with test SOC-OCV curve when SOC be consistent, can guarantee each SOC state in this way
Under the available update of residual energy magnitude.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart；
Fig. 2 is the SOC-OCV curve at a temperature of certain；
Fig. 3 is the method flow diagram of embodiment 1；
Fig. 4 is the self study process flow diagram flow chart of embodiment 4.
Specific embodiment
The present invention will be described in detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
A method of battery remaining power being obtained based on SOC-OCV curve, as shown in Figure 1, including the following steps:
S1, the SOC-OCV curve under different temperatures is obtained using charge and discharge electric cabinet and high-low temperature chamber；
The rated capacity at each temperature can be obtained (in formula 1 by temperature-capacity curve and temperature-energy curve
Q0) and battery gross energy (TotalEnergy in formula 2)；
S2, according to the following formula calculate different temperatures under SOC-OCV curve in each SOC corresponding points dump energy,
It is as shown in Figure 2:
S21, the releasing energy UsedEnergy for first calculating battery:
S22, the dump energy LeftEnergy for calculating battery again:
LeftEnergy=(TotalEnegry-UsedEnergy) × SOH formula (2)
In formula (1) and formula (2): UaFor the corresponding voltage of a state-of-charge, UbFor the corresponding voltage of b state-of-charge,
SOCaFor the corresponding SOC of a state-of-charge, SOCbFor the corresponding SOC of b state-of-charge, Q0For rated capacity, TotalEnergy is
The gross energy of battery, SOH are battery health degree；
The SOC- dump energy curve under different temperatures is obtained by formula (1) and formula (2)；
S3, the SOC- dump energy curve under different temperatures is input in software program；
S4, it is looked into according to the bivariate table of the real-time temperature of battery and the SOC- dump energy of SOC value selection different temperatures
It askes, obtains real-time dump energy.
Since the dump energy of battery and the voltage of battery and SOC have relationship, in the dump energy of sometime battery
Are as follows:
E=SOC × Q0×Ubat×SOH (3)
In formula: SOC is the state-of-charge at current time, Q0For rated capacity, UbatFor the voltage at current time, SOH is to work as
The health degree at preceding moment.
And there is functional relations between monomer voltage and SOC, can be expressed with following formula:
Ubat=f (SOC) (4)
Therefore (4) are brought into formula (3), can obtained:
E=SOC × Q0×f(SOC)×SOH (5)；
Because SOH is constant during impulse discharge, rated capacity Q0It is also definite value, therefore using the reason of integral
It reads, SOC-OCV curve is divided into N number of equal part (N is determined by the number for testing the SOC point of SOC-OCV), the residue between any two points
Energy variation amount are as follows:
Δ E=Δ SOC × Q0×f(SOC)×SOH (6)
When SOC is 100%, dump energy is the gross energy of battery, therefore available formula (1) and (2).According to public affairs
The curve of SOC at this temperature and dump energy can be obtained in formula (1) and formula (2), similarly, according to the SOC- under other temperature spots
The SOC of other available temperature spots of OCV curve and the curve of dump energy.
For example, at a temperature of certain, with 10% interval carry out OCV test to get be 0 to SOC, 10%, 20%, 30%,
40%, 50%, 60%, 70%, 80%, 80% and 100% when corresponding open-circuit voltage.
A, when SOC is 100%, the energy that battery is released is 0；When SOC is 0, the dump energy of battery is 0, therefore SOC
For 100% dump energy are as follows:
LeftEnergysoc_100=TotalEnergy × SOH-UsedEnergy=TotalEnergy × SOH
Dump energy when SOC is 0% are as follows:
LeftEnergysoc_0=0
In formula: TotalEnergy indicates the rated capacity under Current Temperatures, and SOH indicates battery health degree.
B, when SOC is 90%, the energy that battery is released is calculated according to formula (1):
In formula: U100Indicate corresponding open-circuit voltage, U when SOC is 100%90Indicate corresponding open circuit electricity when SOC is 90%
Pressure, Q0Indicate the rated capacity of battery；
C, when SOC is 90%, the dump energy of battery is calculated according to formula (2) are as follows:
LeftEnergysoc_90=LeftEnergySOC_100-UsedEnergy
D, it repeats step 2 and step 3 SOC can be obtained when being 20%, 30%, 40%, 50%, 60%, 70% and 80%
Dump energy LeftEnergysoc_20、LeftEnergysoc_30、LeftEnergysoc_40、LeftEnergysoc_50、
LeftEnergysoc_60、 LeftEnergysoc_70、LeftEnergysoc_80。
For example, specified ampere-hour Q of certain ternary battery core at 25 DEG C0It is for 50Ah, utilisable energy TotalEnergy
0.1883kwh, SOC-OCV data are as follows:
| SOC (%) | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Voltage (mv) | 3413 | 3495 | 3570 | 3611 | 3645 | 3706 | 3811 | 3917 | 4030 | 4153 | 4323 |
When SOC is 100%: LeftEnergysoc_100=TotalEnergy=0.1883kwh；
When SOC is 0:
LeftEnergysoc_0=0；
When SOC is 90%:
When SOC is 80%:
When SOC is 70%:
When SOC is 60%:
When SOC is 50%:
When SOC is 40%:
When SOC is 30%:
When SOC is 20%:
When SOC is 10%:
E, the relationship of each SOC point and dump energy at this temperature has been obtained according to step a-d.
F, repeating step a-e can be obtained the relationship of SOC and dump energy at each temperature, using temperature and SOC as looking into
The input of table, using dump energy as the output tabled look-up.In vehicle operation, for no corresponding SOC and temperature spot
The method that data use linear interpolation, as shown in Figure 3.
Present invention firstly provides the integral for the energy released using SOC-COV curve so that obtain different temperatures and
These data are input in BMS software by the dump energy of the battery under SOC, are carried out according to the current SOC of battery and temperature
It tables look-up and current remaining can be obtained.Relative to existing method, UsedEnergy is calculated using algorithm of the invention, due to
The interval SOC is smaller when OCV is tested, and voltage change is little, and the calculated result of UsedEnergy is accurate.
In program operation, dump energy is existed with the two-dimentional sheet form of temperature, SOC and dump energy, can basis
The current temperature of battery and SOC table look-at obtain dump energy, therefore only need to be previously entered the data of bivariate table when calculating,
Data volume is smaller, while while tabling look-up need to only call directly look-up-table function, can effectively reduce complex calculation to mcu resource
Consumption.The present invention only needs to test most basic battery behavior, and accurate dump energy can be obtained, reduce battery
The workload of test can be realized and obtain real-time battery remaining power in vehicle operation.Therefore, the present invention can have
Effect improves the computational accuracy of dump energy, and the resource reduced in software running process is released.
In the process of moving, actual consumption is the energy content of battery to vehicle, and SOC indicates the remaining ampere-hour number of battery, this hair
The dump energy ratio SOC of bright detection more can accurately predict vehicle remaining mileage.
Embodiment 2
Embodiment 2 has done further optimization on the basis of 1 scheme of embodiment, will be between two state-of-charges of a and b
Interval be set as 5%-10%, preferably 5% and 10%.
For integral itself, interval division is more, and precision is higher；It is excessive to draw but for SOC-OCV curve
By stages will increase test job amount.Through a large number of experiments the study found that when the test interval of SOC chooses 5%-10%, both may
Guarantee the computational accuracy of dump energy, and test job amount can be reduced.
Embodiment 3
Embodiment 3 has done further optimization on the basis of embodiment 1, in step s 2, joined to different temperatures
Under SOC-OCV curve carry out self study process, the specific steps are as follows:
S23, the practical energy discharged of battery is calculated:
When SOC is 90%, the practical energy discharged of battery at this time are as follows:
In formula: U is current time voltage, and I is current time electric current, and dt is the task run week for calculating Integrated discharge energy
Phase, T1For SOC90_T, indicate to discharge into time when SOC is 90% since completely filling；
S24, UsedEnergy is replaced with E, brings formula (2) into, obtains the corresponding dump energy of 90%SOC
LeftEnergySOC_90'；
S25, LeftEnergy is calculatedSOC_90' and LeftEnergySOC_90Between difference DELTA E, when Δ E be greater than 3%
When TotalEnenrgy*SOH, 90%SOC corresponds to new dump energy NewLeftEnergy under Current TemperaturesSOC_90With
LeftEnergySOC_90' replace；Otherwise without updating.
S26, the available SOC of repeat the above steps S22, S23, S24 be 80%, 70%, 60%, 50%, 40%,
30%, 20%, 10% when corresponding new dump energy NewLeftEnergySOC_80、NewLeftEnergySOC_70、
NewLeftEnergySOC_60、NewLeftEnergySOC_50、NewLeftEnergySOC_40、NewLeftEnergySOC_30、
NewLeftEnergySOC_20、NewLeftEnergySOC_10。
SOC-OCV curve when due to cell degradation is different with new battery SOC-OCV curve, will lead to the meter of dump energy
Deviation is calculated, by self study, the dump energy in each stage of available cell degradation process carries out preset value of tabling look-up
Replacement updates, and the value that makes to table look-up is consistent with current battery status always, reduces cell degradation bring calculating deviation.
Embodiment 4
Embodiment 4 on the basis of embodiment 1, not only joined the process of self study, and do to self study process
Further optimization；In the whole life cycle of battery, it is impossible to which frequent progress self study can consume monolithic too much in this way
Machine resource.By numerous studies, we are finally determined, when SOH is in 80%-99% range, using 1% as time interval, starting
Different SOC-OCV curves are carried out with the process of the self study.
When SOH is in 80%-99% range, battery starts aging, and SOC-OCV curve at this moment is possible to deviation, in order to
This deviation is avoided, guarantees that battery software in aging can make a response in time, starts self study process.
Embodiment 5
Embodiment 5 on the basis of embodiment 1, joined self study process, in order to optimize scheme more, embodiment 5
During self study, when SOC is in 20%-90% range, using 10% as interval selection T1Calculate the reality under different temperatures
Border dump energy.
Embodiment 3 and embodiment 5 are selected by the interval to T1, make T1Value should with test SOC-OCV curve
When SOC be consistent, can guarantee the available update of residual energy magnitude under each SOC state in this way.
Claims (6)
1. a kind of method for obtaining battery remaining power based on SOC-OCV curve, which comprises the steps of:
S1, temperature collection-rated capacity curve, the SOC-OCV curve under temperature-gross energy curve and different temperatures；
The dump energy of each SOC corresponding points, obtains under different temperatures in SOC-OCV curve under S2, calculating different temperatures
SOC- dump energy curve；
S3, the SOC- dump energy curve under different temperatures is input in BMS program；
S4, it is inquired, is obtained according to the bivariate table of the real-time temperature of battery and the SOC- dump energy of SOC value selection different temperatures
To real-time dump energy.
2. a kind of method for obtaining battery remaining power based on SOC-OCV curve according to claim 1, feature exist
In, in step S2, dump energy is obtained by following steps,
S21, the releasing energy UsedEnergy for first calculating battery:
S22, the dump energy LeftEnergy for calculating battery again:
LeftEnergy=(TotalEnergy-UsedEnergy) × SOH formula (2)
In formula (1) and formula (2): UaFor the corresponding voltage of a state-of-charge, UbFor the corresponding voltage of b state-of-charge, SOCaFor a
State-of-charge corresponding SOC, SOCbFor the corresponding SOC of b state-of-charge, Q0For rated capacity, TotalEnergy is the total of battery
Energy, SOH are battery health degree.
3. a kind of method for obtaining battery remaining power based on SOC-OCV curve according to claim 2, feature exist
In the siding-to-siding block length range between two state-of-charges of a and b is 5%-10%.
4. a kind of method for obtaining battery remaining power based on SOC-OCV curve according to claim 2, feature exist
In, in step S2, further include under different temperatures SOC-OCV curve carry out self study process, the specific steps are as follows:
S23, the practical energy discharged of battery is calculated
S24, UsedEnergy is replaced with E, brings formula (2) into, obtains LeftEnergy '；
U is current time voltage, and I is current time electric current, and dt is the task run period for calculating Integrated discharge energy, T1It is full
Time of the discharge of electricity to the SOC point for needing self study, LeftEnergy0For real surplus energy；
Difference DELTA E between S25, calculating LeftEnergy and LeftEnergy ', when Δ E is greater than 3%TotalEnenrgy*SOH
When, the dump energy LeftEnergy under Current Temperatures and SOC is replaced with into LeftEnergy '.
5. a kind of method for obtaining battery remaining power based on SOC-OCV curve according to claim 4, feature exist
In when SOH is in 80%-99% range, using 1% as interval, starting carries out the self study to different SOC-OCV curves
Process.
6. a kind of method for obtaining battery remaining power based on SOC-OCV curve according to claim 5, feature exist
During the self study, when SOC is in 20%-90% range, using 5% or 10% as interval selection T1It calculates not
Real surplus energy under synthermal.
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| CN113125967A (en) * | 2021-04-07 | 2021-07-16 | 力高(山东)新能源技术有限公司 | Lithium battery SOE calculation method based on temperature rise prediction |
| CN114137346A (en) * | 2021-11-26 | 2022-03-04 | 国网湖南省电力有限公司 | Energy storage power station battery management system testing arrangement based on digifax simulation platform |
| CN114137346B (en) * | 2021-11-26 | 2023-09-12 | 国网湖南省电力有限公司 | Energy storage power station battery management system testing device based on number simulation real platform |
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