CN107315147A - A kind of electrokinetic cell SOC dynamic estimation methods - Google Patents
A kind of electrokinetic cell SOC dynamic estimation methods Download PDFInfo
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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Abstract
The present invention relates to the administrative skill of electrokinetic cell, it discloses a kind of electrokinetic cell SOC dynamic estimation methods, realize and dynamic estimation simply, exactly is carried out to electrokinetic cell SOC.In the present invention, if estimating SOC value using open circuit voltage method, certain compensation can be done according to temperature profile, the SOC after compensation and Volume is used as initial value electric on this, if without the use of open circuit voltage method, by initial values of the SOC read from EEPROM and Volume directly as electricity on this；Then, according to charging and discharging currents I under normal charging and discharging statec、IdPresent battery capacity Volume is obtained by current integration method, in the charge state according to the SOC of charging curve and its correspondence cell voltage point CVnBattery capacity Volume and SOC are modified, in the discharged condition according to the SOC of discharge curve under the conditions of discharge current size and such a discharge current and its correspondence cell voltage point DVnBattery capacity Volume and SOC are modified.
Description
Technical field
The present invention relates to the administrative skill of electrokinetic cell, and in particular to electrokinetic cell SOC (dump energy) dynamic estimation side
Method.
Background technology
With the popularization and the continuous deterioration of air quality of automobile, the new energy car especially electric automobiles of energy-conserving and environment-protective into
For the important directions of World Auto Industry technological innovation, this is also the inevitable choice of sustainable development.Currently it is used as new energy vapour
The electrokinetic cell correlation technique of the power source of car or electric automobile turns into one of key technology for restriction Development of Electric Vehicles,
And be that can make electrokinetic cell safe and reliable operation, cell safety is ensured, extends service time of battery, it is necessary to the discharge and recharge to battery
Process is effectively managed, among these accurate judgement above all to battery dump energy SOC.
SOC is to embody one of major parameter of battery status, and it can provide basis for estimation for integrated vehicle control tactics.Cause
This, the discharge and recharge of whole battery pack can preferably be managed by accurately judging the SOC of battery pack, ensure the safety of battery, extension electricity
Pond service life, it is to avoid occur security incident.
The factor of influence battery SOC has a lot, such as temperature, charging and discharging currents size, internal resistance, and SOC and these factors
Between and non-linear relation, this just determines to be difficult judge the SOC states of battery by a certain factor, therefore how utilization influences
The factor of battery SOC is accurately predicted the dump energy of battery, is all the primary of power battery management system all the time
Problem and technical barrier.
The SOC algorithms of current battery management system mainly include current integration method, open circuit voltage method, internal resistance method, Kalman
Filter method and neural network model algorithm etc., current integration method are widely adopted because its is simple and easy to apply, but it easily produces and added up
Error, causes SOC to judge increasingly to be forbidden；As long as accurate just energy its SOC of Accurate Prediction of open circuit voltage method battery model, but it is only
It is limited to use during the i.e. open circuit in static state, mostly in actual use is as auxiliary measuring and calculating；Internal resistance method also can more accurately judge
Battery SOC, but due to influenceing the factor of cell contents a lot, it is difficult to which the SOC that internal resistance method is used for battery is measured；Kalman filtering
Algorithm and neural network algorithm are also this several years popular algorithms, but principle is complex, implements relatively difficult.
The content of the invention
The technical problems to be solved by the invention are：Propose a kind of electrokinetic cell SOC dynamic estimation methods, realize it is simple,
Dynamic estimation is carried out to electrokinetic cell SOC exactly.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of electrokinetic cell SOC dynamic estimation methods, including：
A. on battery management system after electricity, the remaining capacity SOC and capacity Volume values in memory module are read；
B. judge read SOC and Volume values whether within prescribed limit, if so, then by the SOC of reading with
Volume values are as initial value electric on this, into step d；Otherwise, into step c；
C. SOC and Volume values are estimated using open circuit voltage method, and according to the state of temperature collected to SOC and Volume
Value is compensated, using SOC the and Volume values after compensation as electricity on this initial value, into step d；
D. in normal discharge and recharge flow, the working condition of battery is judged according to the current value collected, and according to battery
Corresponding working state handled：
If battery is non-charging and non-discharged state, current SOC and Volume values keep constant；
If battery is charged state, according to charging current Ic, present battery capacity Volume is obtained by current integration method
Value, and calculate SOC；Then according to the SOC of charging curve and its correspondence cell voltage point CVn(n=1~N, N are voltage on curve
The number of point) present battery capacity Volume values and the SOC calculated are modified；Revised SOC and Volume values are deposited
Enter in memory module；
If battery is discharge condition, according to discharge current Id, present battery capacity Volume is obtained by current integration method
Value, and calculate SOC；Then according to the SOC of corresponding discharge curve under the conditions of the discharge current and its correspondence cell voltage point DVn
(n=1~N, N are the number of electrical voltage point on curve) is carried out to present battery capacity Volume values and the SOC calculated
Amendment；Revised SOC and Volume values are stored in memory module.
As further optimization, this method is before step a, in addition to step：
A0. cell voltage and N number of SOC value of SOC curves and its corresponding battery electricity under charged state are obtained by testing
Press CV1~CVN, and by testing the curved line relation of cell voltage and SOC under acquisition M kind discharge conditions, and in every kind of partial discharge
N number of SOC value and its correspondence cell voltage DV are marked on current curve1~DVN。
As further optimization, in step d, in the case where battery is charged state, the SOC according to charging curve and its right
Answer cell voltage point CVn(n=1~N, N are the number of electrical voltage point on curve) is to present battery capacity Volume values and calculates
SOC is modified, and is specifically included：
If current battery level is more than a certain particular value CVtWhen, according to SOC and its corresponding voltage adjusting point on charging curve
CV1~CVNRelation be modified：If the SOC calculated is less than on charging curve adjusting point CV where current voltageNCorresponding SOC
During value, the SOC value of calculating is modified to CVNCorresponding SOC.
Optimize as further, it is described according to right under the conditions of the discharge current in the case where battery is discharge condition in step d
The SOC and its correspondence cell voltage point DV for the discharge curve answeredn(n=1~N, N are the number of electrical voltage point on curve) is to current electricity
Tankage Volume values and the SOC calculated are modified, and are specifically included：
When cell voltage is less than a certain particular value DVtWhen, start to be modified battery SOC and Volume values：
First determine whether discharge current size Id, find out IdUnder the conditions of corresponding discharge curve, according to SOC on discharge curve and
Its corresponding voltage adjusting point DV1~DVNRelation be modified：If the SOC calculated is more than current voltage institute repairing on discharge curve
DV on scheduleNDuring corresponding SOC, SOC is modified to DVNCorresponding SOC.
Optimize as further, in step d, in the case where battery is charged state, obtains present battery by current integration method and hold
Amount Volume values method be：
Read the capacity V of a upper periodQ, the ampere-hour integral capacity V of this period is obtained by current integration methodZ, will
VQWith VZIt is added and obtains present battery capacity Volume values.
Optimize as further, in step d, in the case where battery is discharge condition, obtains present battery by current integration method and hold
Amount Volume values method be：
Read the capacity V of a upper periodQ, the ampere-hour integral capacity V of this period is obtained by current integration methodZ, profit
Use VQSubtract VZObtain present battery capacity Volume values.
As further optimization, the battery management system includes：
Parameter collection module, main controller module and memory module；
The parameter collection module is used for monomer voltage, extreme voltage, charging and discharging currents and the temperature value for gathering battery pack；
Master controller is used to calculate power battery pack current capacities in real time and according to voltage and current status amendment SOC.
The beneficial effects of the invention are as follows：
The cell voltage, battery temperature, charging and discharging currents of collection are handled by setting up dynamic SOC appraising models,
And battery SOC is modified or compensated according to some SOC points of battery charging and discharging curve and its corresponding voltage point, reach and accurately estimate
Calculate electrokinetic cell SOC purpose；
The present invention can dynamically estimate battery SOC according to different parameters situation, prevent super-charge super-discharge occur in battery use
Situation, effectively extend battery, improve cell safety service rating.
Brief description of the drawings
Fig. 1 is the graph of a relation of SOC and cell voltage under the power battery charging state that experiment is measured；
Fig. 2 is the relation curve of electrokinetic cell SOC and cell voltage under partial discharge electric current that experiment is measured；
Fig. 3 is electrokinetic cell SOC estimating algorithm flow charts at the beginning of upper electricity in embodiment；
Fig. 4 is electrokinetic cell SOC dynamic estimation algorithm flow charts under normal charging and discharging state in embodiment.
Embodiment
The present invention is directed to propose a kind of electrokinetic cell SOC dynamic estimation methods, are realized simply, exactly to electrokinetic cell
SOC carries out dynamic estimation.Its core concept is：SOC and Volume on battery management system after electricity in EEPROM is true
It is fixed whether to estimate SOC value using open circuit voltage method, if estimating SOC value using open circuit voltage method, it can be done necessarily according to temperature profile
Compensation, SOC after compensation and Volume, will be from if being without the use of open circuit voltage method as the initial value of electricity this on
Initial values of the SOC read in EEPROM the and Volume directly as electricity on this；
Then, according to charging and discharging currents I under normal charging and discharging statec、IdPresent battery is obtained by current integration method to hold
Volume is measured, in the charge state according to the SOC of charging curve and its correspondence cell voltage point CVnTo battery capacity Volume and
SOC is modified, in the discharged condition according to the SOC of discharge curve under the conditions of discharge current size and such a discharge current and its
Correspondence cell voltage point DVnBattery capacity Volume and SOC are modified.Finally by the battery capacity Volume after amendment
And in SOC deposits EEPROM.
Below in conjunction with the accompanying drawings and embodiment the solution of the present invention is further described：
The electrokinetic cell SOC dynamic estimation methods of the present embodiment comprise the following steps：
1st, experiment is repeated several times and obtains SOC and its adjusting point voltage CV on power battery charging curve1~CVNCorrespondence pass
System, wherein N is the number of adjusting point, as shown in Figure 1；
Electrokinetic cell discharge curve in the case of M kind discharge currents is obtained by the way that experiment is repeated several times, each electric discharge is bent
There are N number of SOC points and its voltage adjusting point DV on line1~DVNCorresponding relation, SOC under one of which partial discharge current conditions
With voltage adjusting point DV1~DVNRelation it is as shown in Figure 2；
2nd, read first after electricity on battery management system and be stored in SOC and Volume information in EEPROM, judge SOC and
Volume estimates battery SOC and Volume if not in prescribed limit whether in prescribed limit according to open circuit voltage method, and
The SOC and Volume are compensated according to the state of temperature collected, algorithm flow is switched to as shown in figure 3, being disposed
In normal charge and discharge cycles detection state；If SOC and Volume are in prescribed limit, normal charge and discharge cycles are directly switch to
In detection state；
3rd, judge that battery is in charged state, electric discharge shape according to the current value collected first in normal discharge and recharge flow
State or it is non-fill the non-state put, as shown in Figure 4；
4th, when battery be in it is non-fill it is non-put state when, the holding of current SOC and Volume values is constant；
5th, when battery is in charged state, by the capacity V of previous time periodQAmpere-hour plus this period integrates appearance
Measure VZIt is exactly current battery capacity VD, and calculate current SOCDIf current battery level is more than a certain particular value CVtWhen foundation
SOC and its corresponding voltage adjusting point CV on charging curve1-CVNRelation be modified：Work as SOCDFilled less than current voltage correspondence
Voltage adjusting point CV on electric curveNDuring corresponding SOC, by SOCDIt is modified to CVNCorresponding SOC, and ensure SOC during charging
Amendment can only forward direction correct, i.e., towards the increased adjustment in direction of SOC；
6th, when battery is in discharge condition, by the capacity V of previous time periodQSubtract the ampere-hour integral capacity of this period
VZIt is exactly current battery capacity VD, and calculate current SOCD, when cell voltage is less than a certain particular value DVtWhen start to battery
SOC and Volume are modified：First determine whether discharge current size Id, find out IdUnder the conditions of discharge curve on current voltage institute
In adjusting point DVNCorresponding SOC, works as SOCDMore than DVNDuring corresponding SOC, SOC is modified to DVNCorresponding SOC, and ensure
SOC amendment positive can only be corrected during electric discharge, i.e., the adjustment in direction reduced towards SOC；
7th, finally revised SOC and Volume values are stored in EEPROM.
Claims (8)
1. a kind of electrokinetic cell SOC dynamic estimation methods, it is characterised in that including：
A. on battery management system after electricity, the remaining capacity SOC and capacity Volume values in memory module are read；
B. SOC the and Volume values read are judged whether within prescribed limit, if so, then by SOC the and Volume values of reading
As the initial value of electricity on this, into step d；Otherwise, into step c；
C. SOC and Volume values are estimated using open circuit voltage method, and SOC and Volume values is entered according to the state of temperature collected
Row compensation, using SOC the and Volume values after compensation as electric initial value on this, into step d；
D. in normal discharge and recharge flow, the working condition of battery is judged according to the current value collected, and according to the phase of battery
Working condition is answered to be handled：
If battery is non-charging and non-discharged state, current SOC and Volume values keep constant；
If battery is charged state, according to charging current Ic, present battery capacity Volume values are obtained by current integration method, and
Calculate SOC；Then according to the SOC of charging curve and its correspondence cell voltage point CVn(n=1~N, N are electrical voltage point on curve
Number) present battery capacity Volume values and the SOC calculated are modified；Revised SOC and Volume values deposit is deposited
In memory modules；
If battery is discharge condition, according to discharge current Id, present battery capacity Volume values are obtained by current integration method, and
Calculate SOC；Then according to the SOC of corresponding discharge curve under the conditions of the discharge current and its correspondence cell voltage point DVn(n=1
~N, N are the number of electrical voltage point on curve) present battery capacity Volume values and the SOC calculated are modified；After correcting
SOC and Volume values deposit memory module in.
2. a kind of electrokinetic cell SOC dynamic estimation methods as claimed in claim 1, it is characterised in that this method step a it
Before, in addition to step：
A0. N number of SOC value and its corresponding cell voltage CV of the cell voltage under experiment acquisition charged state with SOC curves are passed through1
~CVN, and by testing the curved line relation of cell voltage and SOC under acquisition M kind discharge conditions, and in every kind of partial discharge electric current
N number of SOC value and its correspondence cell voltage DV are marked on curve1~DVN。
3. a kind of electrokinetic cell SOC dynamic estimation methods as claimed in claim 2, it is characterised in that in step d, in battery
For under charged state, the SOC and its correspondence cell voltage point CV according to charging curven(n=1~N, N are voltage on curve
The number of point) present battery capacity Volume values and the SOC calculated are modified, specifically include：
If current battery level is more than a certain particular value CVtWhen, according to SOC and its corresponding voltage adjusting point CV on charging curve1~
CVNRelation be modified：If the SOC calculated is less than on charging curve adjusting point CV where current voltageNDuring corresponding SOC value,
The SOC value of calculating is modified to CVNCorresponding SOC.
4. a kind of electrokinetic cell SOC dynamic estimation methods as claimed in claim 3, it is characterised in that in step d, in battery
For under charged state, the method for obtaining present battery capacity Volume values by current integration method is：
Read the capacity V of a upper periodQ, the ampere-hour integral capacity V of this period is obtained by current integration methodZ, by VQWith
VZIt is added and obtains present battery capacity Volume values.
5. a kind of electrokinetic cell SOC dynamic estimation methods as claimed in claim 2, it is characterised in that in step d, in battery
For under discharge condition, the SOC and its correspondence cell voltage point DV according to corresponding discharge curve under the conditions of the discharge currentn
(n=1~N, N are the number of electrical voltage point on curve) is modified to present battery capacity Volume values and the SOC calculated, specifically
Including：
When cell voltage is less than a certain particular value DVtWhen, start to be modified battery SOC and Volume values：
First determine whether discharge current size Id, find out IdUnder the conditions of corresponding discharge curve, according to SOC on discharge curve and its right
Answer voltage adjusting point DV1~DVNRelation be modified：If the SOC calculated is more than on discharge curve adjusting point where current voltage
DVNDuring corresponding SOC, SOC is modified to DVNCorresponding SOC.
6. a kind of electrokinetic cell SOC dynamic estimation methods as claimed in claim 5, it is characterised in that in step d, in battery
For under discharge condition, the SOC and its correspondence cell voltage point DV according to corresponding discharge curve under the conditions of the discharge currentn
(n=1~N, N are the number of electrical voltage point on curve) is modified to present battery capacity Volume values and the SOC calculated, specifically
Including：
When cell voltage is less than a certain particular value DVtWhen, start to be modified battery SOC and Volume values：
First determine whether discharge current size Id, find out IdUnder the conditions of corresponding discharge curve, according to SOC on discharge curve and its right
Answer voltage adjusting point DV1~DVNRelation be modified：If the SOC calculated is more than on discharge curve adjusting point where current voltage
DVNDuring corresponding SOC, SOC is modified to DVNCorresponding SOC.
7. a kind of electrokinetic cell SOC dynamic estimation methods as claimed in claim 6, it is characterised in that in step d, in battery
For under discharge condition, the method for obtaining present battery capacity Volume values by current integration method is：
Read the capacity V of a upper periodQ, the ampere-hour integral capacity V of this period is obtained by current integration methodZ, utilize VQ
Subtract VZObtain present battery capacity Volume values.
8. a kind of electrokinetic cell SOC dynamic estimation methods as described in claim 1-7 any one, it is characterised in that described
Battery management system includes：
Parameter collection module, main controller module and memory module；
The parameter collection module is used for monomer voltage, extreme voltage, charging and discharging currents and the temperature value for gathering battery pack；
Master controller is used to calculate power battery pack current capacities in real time and according to voltage and current status amendment SOC.
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| CN109001640A (en) * | 2018-06-29 | 2018-12-14 | 深圳市科列技术股份有限公司 | A kind of data processing method and device of power battery |
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