CN106597314A - Vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method - Google Patents
Vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method Download PDFInfo
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- CN106597314A CN106597314A CN201710032470.XA CN201710032470A CN106597314A CN 106597314 A CN106597314 A CN 106597314A CN 201710032470 A CN201710032470 A CN 201710032470A CN 106597314 A CN106597314 A CN 106597314A
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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
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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Abstract
The present invention provides a vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method. In the certain environment temperature T set, the battery is charged to 50% of rated capacity, and the battery is continuously charged and the corresponding battery voltage U1, the battery temperature T1 and the battery charging capacity C charge are recorded, after the discharging is finished, the capacity test is performed to obtain the discharging capacity C actuality_1, the actual charge maintenance SOC actuality_1 and the voltage U pair_1 corresponding to the SOC actuality_1 at any moment between the 50% and 100% of the carried charge of a power battery pack are obtained through calculation according to the corresponding format; and the battery is charged to the 50% of the rated capacity, and the battery is discharged and the corresponding battery voltage U2, the battery temperature T2 and the battery discharge capacity C discharging are recorded, the capacity test is tested to obtain the discharge capacity C actuality_2, and the actual charge maintenance SOC actuality_2 and the voltage U pair_2 corresponding to the SOC actuality_2 at any moment between the 50% and 100% of the carried charge of a power battery pack are obtained through calculation according to the corresponding format. The vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method is accurate and reliable, and can avoid battery abusing.
Description
Technical field
The present invention relates to the determination method of a kind of true charged holding of battery and corresponding voltage, more particularly to a kind of automobile-used nickel
The true charged holding of hydrogen electrokinetic cell bag and the determination method of corresponding voltage.
Background technology
21 century is the challenge epoch that human society faces energy shortage and environmental pollution improvement：Petroleum resources subtract year by year
Few, oil price progressively rises, and reducing auto-pollution and energy saving has become the Tough questions of countries in the world government faces.Because of battery
Technology and Cost Problems, exploitation hybrid vehicle is that situation is become.In hybrid vehicle, as a result of high-power
Energy storage device provides instantaneous energy to automobile and can reduce size of engine, improves efficiency, reduces discharge and fuel oil disappears
Consumption, and can recover energy when being braked and slow down.Ni-MH power cell has safe, the high-specific-power, long-life, resistance to
The excellent overall characteristic such as super-charge super-discharge, recycling capable of circulation, pollution-free, is that current hybrid-electric car application is most consentient
Battery system, and unique scale the battery system through extensive actual verification.In order to ensure cell safety and car load control
The execution of system strategy, the research of HEV automobile batteries management systems (BMS) are particularly important.Wherein charged holding SOC is special as battery
Property topmost influence factor, for BMS manage and control battery SOC the use of interval is batteries management system all the time
One of focus and difficult point of research.Existing HEV Ni-MH power cells group SOC using interval evaluation methodology is, by BMS
It is to monitor and manage SOC using interval, current that both end voltage amendment is added using Ah integration methods mainly, but SOC estimation Ah are accumulated
Dividing affects with factors such as use time, temperature, electric currents so that cannot obtain relatively accurate SOC value of battery.And terminal voltage is made
The accuracy that one defence line is finally controlled for BMS is particularly important, and the demarcation technical difficult points of current terminal voltage have following
2 points：(1) terminal voltage corresponding SOC states when cannot accurately know test；(2) temperature rise when demarcating causes under the SOC states
Terminal voltage is not the actual value at a temperature of test is arranged.Therefore how to determine the true charged holding of automobile-used Ni-MH power cell bag,
And correctly determine its corresponding voltage, it is that present battery management system needs the urgent technical task for solving.
The content of the invention
The present invention is intended to provide a kind of true charged holding of accurately and reliably automobile-used Ni-MH power cell bag and corresponding voltage
Determination method.The present invention is realized by below scheme：
A kind of true charged holding of automobile-used Ni-MH power cell bag and the determination method of corresponding voltage, take qualified power current
Chi Bao, in certain environment temperature TIfUnder, after shelving certain hour, carry out according to the following steps：
I using 0.2C～1C charging current for charging to the 50% of rated capacity, after shelving certain hour, using 0.5C～
The charging current of 10C continues to charge, until charging voltage reaches N*1.6V or charging capacity is stopped when reaching the 100% of rated capacity
Only, record continues corresponding cell voltage U1, battery temperature T1 and battery charge capacity C in charging process at regular intervalsFill,
After shelving certain hour, N*1.0V is discharged to using the discharge current of 0.2C～0.5C；After shelving certain hour, filled using standard
Discharge current carries out volume test, obtains discharge capacity C of now electrokinetic cell bagReal _ 1；Electrokinetic cell is calculated according to formula (1)
The true charged holding SOC of bag any time between carried charge 50%～100%Very _ 1, the electrokinetic cell bag moment is truly charged
Keep SOCVery _ 1Corresponding voltage URight _ 1It is calculated according to formula (2)：
SOCVery _ 1=((50% × CVolume+CFill)/CReal _ 1) × 100% ... ... ... ... ... (1)
URight _ 1=U1+ (T1-TIf) × (N × R) ... ... ... ... ... ... (2) II filling using 0.2C～1C
Electric current charges to the 50% of rated capacity, after shelving certain hour, is discharged to N* using the discharge current of 0.5C～10C
1.0V, records corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell C in discharge process at regular intervalsPut；Put
After putting certain hour, remnants are first put, volume test is carried out using standard charging and discharging currents afterwards, obtain now electrokinetic cell bag
Discharge capacity CReal _ 2；According to formula (3) calculate electrokinetic cell bag between carried charge 0%～50% any time it is true charged
Keep SOCVery _ 2, the electrokinetic cell bag moment true charged holding SOCVery _ 2Corresponding voltage URight _ 2It is calculated according to formula (4)：
SOCVery _ 2=((50% × CVolume- CPut)/CReal _ 2) × 100% ... ... ... ... ... (3)
URight _ 2=U2- (T2-TIf)×(N×R)………………………………(4)
N in step I, step II, formula (2) and formula (4) is the cell number that is serially connected in electrokinetic cell bag；
C in formula (1), formula (3)VolumeFor the rated capacity of electrokinetic cell bag, material partial molal entropies of the R for cell.
The material partial molal entropy R of cell is a gross data, and its unit is V/ DEG C, is calculated by formula 5：
R=△rS/nF…………………………………………………………………(5)
Wherein, △rS is Entropy Changes, is the build-in attribute under each cell reaction material uniform temperature, and which is with ambient temperature
Change with discharge current or charging current and change, analog value can be obtained according to theory；N is the material that battery exports elementary charge
Amount；F is Faraday constant.
In order to obtain accurate data as far as possible, battery after charging, discharging needs to shelve certain hour, so as to
So that battery temperature is as consistent as possible with ambient temperature, generally, the time of shelving is set as that 3～5h can ensure electricity substantially
Pond temperature is consistent with ambient temperature.
The charging current of the use 0.5C～10C in the step I continues corresponding cell voltage U1, electricity in charging process
Pond temperature T1 and battery charge capacity CFillRecord time interval be 0.1～1 second；Use 0.5C～10C in the step II
Discharge current discharge process in corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell CPutRecord time interval
For 0.1～1 second.
Generally, standard charging and discharging currents are 0.1C～0.3C.
The true charged holding of the automobile-used Ni-MH power cell bag of the present invention and the determination method of corresponding voltage, are entered by substep
Row battery charging and discharging is tested, it is to avoid the thermal conductivity that battery charging and discharging is produced causes the error of test, and combines cell reaction thermodynamics
Relation of the battery electric quantity with voltage is demarcated, it is ensured that the association of the true charged holding of test and voltage relation between the two
Property, reasonability.The inventive method, can accurately determine the true charged holding of automobile-used Ni-MH power cell bag, while accurately really
Voltage corresponding to fixed true charged holding, thus, only need to accurately determine the SOC SC service ceiling values of automobile-used Ni-MH power cell bag
With use lower limit, just can accurately determine its corresponding magnitude of voltage, it is more accurate to provide for battery management system control strategy
SOC two ends protection with amendment, be conducive to cell evaluation personnel and the common optimization design of battery management system personnel so that automobile-used
The SOC of Ni-MH power cell bag is conducive to Ni-MH power cell bag preferably to apply using interval as far as possible in scope of design
On hybrid vehicle, it is to avoid battery is abused.
Specific embodiment
The invention will be further described with reference to embodiments, but the invention is not limited in the statement of embodiment.
Embodiment 1
A kind of true charged holding of automobile-used Ni-MH power cell bag and the determination method of corresponding voltage, take qualified power current
Chi Bao, monomer battery are D6000, and electrokinetic cell bag is 8 and 396 string combinations, that is, the cell number being serially connected is 396
Only, rated capacity C of electrokinetic cell bagVolumeFor 48Ah, in ambient temperature TIfAt for 25 DEG C, after shelving 3h, carry out according to the following steps：
I uses the charging current for charging of 0.2C to the 50% of rated capacity, after shelving 3h, is continued using the charging current of 1C
Charge, until charging voltage reaches 633.6V or charging capacity stops when reaching the 100% of rated capacity, recorded every 0.1 second
Continue corresponding cell voltage U1, battery temperature T1 and battery charge capacity C in charging processFill, after shelving 3h, using 0.2C's
Discharge current is discharged to 396V；After shelving 3h, volume test is carried out using 0.2C charging and discharging currents, obtain now electrokinetic cell bag
Discharge capacity CReal _ 1；According to formula (1) calculate electrokinetic cell bag between carried charge 50%～100% any time it is true
Charged holding SOCVery _ 1, the electrokinetic cell bag moment true charged holding SOCVery _ 1Corresponding voltage URight _ 1Calculated according to formula (2)
Obtain：
SOCVery _ 1=((50% × CVolume+CFill)/CReal _ 1) × 100% ... ... ... ... ... (1)
URight _ 1=U1+ (T1-TIf) × (N × R) ... ... ... ... ... ... (2) II is electric using the charging of 0.2C
Current charge was discharged to 396V using the discharge current of 1C to the 50% of rated capacity after shelving 3h, every record electric discharge in 0.1 second
During corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell CPut；After shelving 3h, using 0.2C discharge currents elder generation
Remnants are put, volume test is carried out using 0.2C charging and discharging currents afterwards, obtain discharge capacity C of now electrokinetic cell bagReal _ 2；Root
The true charged holding SOC of electrokinetic cell bag any time between carried charge 0%～50% is calculated according to formula (3)Very _ 2, power
The battery bag moment true charged holding SOCVery _ 2Corresponding voltage URight _ 2It is calculated according to formula (4)：
SOCVery _ 2=((50% × CVolume- CPut)/CReal _ 2) × 100% ... ... ... ... ... (3)
URight _ 2=U2- (T2-TIf)×(N×R)………………………………(4)
N in step I, step II, formula (2) and formula (4) is the cell number that is serially connected in electrokinetic cell bag；
C in formula (1), formula (3)VolumeFor the rated capacity of electrokinetic cell bag, material partial molal entropies of the R for cell.
It is assumed that the U1 that certain moment is obtained from step I is 569.25V, T1 is 26.5 DEG C, CFillFor 20.2Ah, CReal _ 1For
49.1Ah, according to the ambient temperature and the corresponding Entropy Changes △ of charging current of settingrS is calculated R for 0.0036V/ by formula (5)
DEG C, data are substituted into and is calculated in formula (1), SOCVery _ 1For 90%；Data are substituted into and is calculated in formula (2), SOCVery _ 1
Corresponding voltage URight _ 1For 571.4V.In the same manner, electrokinetic cell bag is obtained between carried charge 50%～100% any time
True charged holding SOCVery _ 1And SOCVery _ 1Corresponding voltage URight _ 1。
It is assumed that the U2 that certain moment is obtained from step II is 475.53V, T2 is 26.1 DEG C, CPutFor 19Ah, CReal _ 2For
49.1Ah, according to the ambient temperature and the corresponding Entropy Changes △ of discharge current of settingrIt is 0.001 that S is calculated R by formula (5), will
Data are calculated in substituting into formula (3), SOCVery _ 2For 10.2%；Data are substituted into and is calculated in formula (4), SOCVery _ 2Institute
Corresponding voltage URight _ 2For 475.1.In the same manner, the true lotus of any time that electrokinetic cell bag is obtained between carried charge 0%～50%
Electricity keeps SOCVery _ 2And SOCVery _ 2Corresponding voltage URight _ 2。
Embodiment 2
A kind of true charged holding of automobile-used Ni-MH power cell bag and the determination method of corresponding voltage, its method and embodiment
Method in 1 is similar, and difference is：
1st, the time is shelved for 4h；
2nd, in step I, charge to rated capacity 50% charging current be 0.5C, continue charge charging current be
5C, corresponding cell voltage U1, battery temperature T1 and battery charge capacity C in 0.5 second record continues charging processFill, put
Electric current is 0.5C.
3rd, in step II, the charging current for charging to the 50% of rated capacity is 0.5C, and discharge current is 5C, every 0.5
Corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell C in second record discharge processPut。
Embodiment 3
A kind of true charged holding of automobile-used Ni-MH power cell bag and the determination method of corresponding voltage, its method and embodiment
Method in 1 is similar, and difference is：
1st, the time is shelved for 5h；
2nd, in step I, the charging current for charging to the 50% of rated capacity is 1C, and the charging current for continuing to charge is 10C,
Corresponding cell voltage U1, battery temperature T1 and battery charge capacity C in 1 second record continues charging processFill, discharge current
For 0.5C.
3rd, in step II, the charging current for charging to the 50% of rated capacity is 1C, and discharge current is 10C, is remembered every 1 second
Corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell C in recording playback electric processPut。
Claims (3)
1. the determination method of a kind of true charged holding of automobile-used Ni-MH power cell bag and corresponding voltage, it is characterised in that：Take conjunction
The electrokinetic cell bag of lattice, in certain environment temperature TIfUnder, after shelving certain hour, carry out according to the following steps：
I uses the charging current for charging of 0.2C～1C to the 50% of rated capacity, after shelving certain hour, using 0.5C～10C
Charging current continue to charge, until charging voltage reaches N*1.6V or stops when charging capacity reaches the 100% of rated capacity,
Record continues corresponding cell voltage U1, battery temperature T1 and battery charge capacity C in charging process at regular intervalsFill, put
After putting certain hour, N*1.0V is discharged to using the discharge current of 0.2C～0.5C；After shelving certain hour, using standard charge and discharge
Electric current carries out volume test, obtains discharge capacity C of now electrokinetic cell bagReal _ 1；Electrokinetic cell bag is calculated according to formula (1)
The true charged holding SOC of any time between carried charge 50%～100%Very _ 1, the electrokinetic cell bag moment true charged guarantor
Hold SOCVery _ 1Corresponding voltage URight _ 1It is calculated according to formula (2)：
SOCVery _ 1=((50% × CVolume+CFill)/CReal _ 1) × 100% ... ... ... ... ... (1)
URight _ 1=U1+ (T1-TIf)×(N×R)…………………………………(2)
II uses the charging current for charging of 0.2C～1C to the 50% of rated capacity, after shelving certain hour, using 0.5C～10C
Discharge current be discharged to N*1.0V, record corresponding cell voltage U2, battery temperature T2 in discharge process at regular intervals
With discharge capacity of the cell CPut；After shelving certain hour, remnants are first put, volume test is carried out using standard charging and discharging currents afterwards,
Obtain discharge capacity C of now electrokinetic cell bagReal _ 2；According to formula (3) calculate electrokinetic cell bag carried charge 0%～50% it
Between any time true charged holding SOCVery _ 2, the electrokinetic cell bag moment true charged holding SOCVery _ 2Corresponding voltage URight _ 2
It is calculated according to formula (4)：
SOCVery _ 2=((50% × CVolume- CPut)/CReal _ 2) × 100% ... ... ... ... ... (3)
URight _ 2=U2- (T2-TIf)×(N×R)…………………………………(4)
N in step I, step II, formula (2) and formula (4) is the cell number that is serially connected in electrokinetic cell bag；Formula
(1), the C in formula (3)VolumeFor the rated capacity of electrokinetic cell bag, material partial molal entropies of the R for cell.
2. the determination method of the true charged holding of automobile-used Ni-MH power cell bag as claimed in claim 1 and corresponding voltage, its
It is characterised by：It is described to shelve the time for 3～5h.
3. the determination method of the true charged holding of automobile-used Ni-MH power cell bag as claimed in claim 1 or 2 and corresponding voltage,
It is characterized in that：The charging current of the use 0.5C～10C in the step I continues corresponding cell voltage in charging process
U1, battery temperature T1 and battery charge capacity CFillRecord time interval be 0.1～1 second；Use 0.5C in the step II
Corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell C in the discharge current discharge process of～10CPutRecord when
Between at intervals of 0.1～1 second.
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| CN110018426A (en) * | 2019-03-11 | 2019-07-16 | 中国航发北京航空材料研究院 | A kind of measurement method that the partial molal entropy for cell health state monitoring becomes |
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| CN106597314B (en) | 2019-03-15 |
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