CN106597314B - The determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage - Google Patents
The determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage Download PDFInfo
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- CN106597314B CN106597314B CN201710032470.XA CN201710032470A CN106597314B CN 106597314 B CN106597314 B CN 106597314B CN 201710032470 A CN201710032470 A CN 201710032470A CN 106597314 B CN106597314 B CN 106597314B
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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 the determination method of a kind of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage, in certain environment temperature TIfUnder, battery charges to the 50% of rated capacity, continues to charge and record its corresponding cell voltage U1, battery temperature T1 and battery charge capacity C laterIt fills, after being discharged, carry out volume test and obtain discharge capacity CReal _ 1, according to the true charged holding SOC of respective formula any time that power battery pack is calculated between carried charge 50%~100%Very _ 1And SOCVery _ 1Corresponding voltage URight _ 1；Battery is charged to the 50% of rated capacity, discharge later and records its corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell CIt puts, after putting remnants, carry out volume test and obtain discharge capacity CReal _ 2, according to the true charged holding SOC of respective formula any time that power battery pack is calculated between carried charge 0%~50%Very _ 2And SOCVery _ 2Corresponding voltage URight _ 2.The method of the present invention accurately and reliably can avoid battery abuse.
Description
Technical field
The present invention relates to a kind of determination method of battery true charged holding and corresponding voltage, in particular to a kind of automobile-used nickel
The determination method of hydrogen power battery pack true charged holding and corresponding voltage.
Background technique
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 gradually rises, and reduces auto-pollution and the energy saving serious problem for having become countries in the world government faces.Because of battery
Technology and cost problem, exploitation hybrid vehicle is trend of the situation.It is high-power due to using in hybrid vehicle
Energy storage device provides instantaneous energy to automobile and can reduce engine size, improves efficiency, and reduces discharge and fuel oil disappears
Consumption, and can recover energy when being braked and being slowed down.Ni-MH power cell with high security, it is high-specific-power, the long-life, resistance to
The excellent overall characteristic such as super-charge super-discharge, recyclable recycling, pollution-free, is that current hybrid-electric car application is most consentient
Battery system, and unique scale and the battery system Jing Guo extensive actual verification.In order to ensure cell safety and vehicle control
The execution of strategy is made, the research of HEV automobile batteries management system (BMS) is particularly important.Wherein charged holding SOC is as battery spy
The most important influence factor of property, is battery set management system all the time using section for the battery SOC that BMS is managed and controlled
One of the hot and difficult issue of system research.Existing HEV is to pass through using the evaluation method in section with Ni-MH power cell group SOC
BMS uses section to monitor and manage SOC, is mainly corrected at present using Ah integration method plus both end voltage, however SOC estimation
Ah integral is with the influence of the factors such as time, temperature, electric current is used, so that being unable to get relatively accurate SOC value of battery.And hold electricity
The accuracy that pressure finally controls one of defence line as BMS is particularly important, and the calibration technical difficult points of mesh front voltage have
Following two points: voltage corresponding SOC state in end when (1) can not accurately know test；(2) temperature rise leads to the SOC state when demarcating
Under end voltage be not test setting at a temperature of true value.Therefore how to determine automobile-used Ni-MH power cell packet really charged guarantor
It holds, and correctly determines its corresponding voltage, be the technical task that present battery management system needs urgently to solve.
Summary of the invention
The present invention is intended to provide a kind of accurately and reliably automobile-used Ni-MH power cell packet really charged holding and corresponding voltage
Determination method.The present invention is realized by the following scheme:
A kind of determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage, takes qualified power electric
Chi Bao, in certain environment temperature TIfUnder, it shelves after a certain period of time, sequentially includes the following steps:
I charges to the 50% of rated capacity using the charging current of 0.2C~1C, shelves after a certain period of time, uses 0.5C
The charging current of~10C continues to charge, when charging voltage reaches N*1.6V or charging capacity reaches the 100% of rated capacity
Stop, record continues corresponding cell voltage U1, battery temperature T1 and battery charge capacity in charging process at regular intervals
CIt fills, shelve after a certain period of time, be discharged to N*1.0V using the discharge current of 0.2C~0.5C；It shelves after a certain period of time, uses mark
Quasi- charging and discharging currents carry out volume test, obtain the discharge capacity C of power battery pack at this timeReal _ 1；Power is calculated according to formula (1)
The true charged holding SOC of battery pack any time between carried charge 50%~100%Very _ 1, the power battery pack moment is true
Real charged holding SOCVery _ 1Corresponding voltage URight _ 1It is calculated according to formula (2):
SOCVery _ 1=((50% × CVolume+CIt fills)/CReal _ 1) × 100% ... ... ... ... ... (1)
URight _ 1=U1+ (T1-TIf) × (N × R) ... ... ... ... ... ... (2) II use 0.2C~1C's
Charging current charges to the 50% of rated capacity, shelves after a certain period of time, 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 intervalsIt puts；It puts
It sets after a certain period of time, first puts remnants, carry out volume test using standard charging and discharging currents later, obtain power battery pack at this time
Discharge capacity CReal _ 2；According to formula (3) calculate power battery pack between carried charge 0%~50% any time it is true charged
Keep SOCVery _ 2, the power battery pack moment true charged holding SOCVery _ 2Corresponding voltage URight _ 2It is calculated according to formula (4)
It arrives:
SOCVery _ 2=((50% × CVolume- CIt puts)/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 single battery number being serially connected in power battery pack；
C in formula (1), formula (3)VolumeFor the rated capacity of power battery pack, R is the substance partial molal entropy of single battery.
The substance partial molal entropy R of single battery is a gross data, and 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 certain temperature, with environment temperature
Variation with discharge current or charging current and change, analog value can be obtained according to theory；N is the substance that battery exports elementary charge
Amount；F is Faraday constant.
In order to obtain accurate data as far as possible, battery needs to shelve certain time after charging, electric discharge, so as to
So that battery temperature is as consistent as possible with environment temperature, under normal circumstances, shelving the time is set as 3~5h and can guarantee substantially
Battery temperature is consistent with environment temperature.
The charging current using 0.5C~10C in the step I continues corresponding cell voltage U1, electricity in charging process
Pond temperature T1 and battery charge capacity CIt fillsRecord time interval be 0.1~1 second；0.5C~10C is used in the step II
Discharge current discharge process in corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell CIt putsThe record time between
It is divided into 0.1~1 second.
Under normal circumstances, standard charging and discharging currents are 0.1C~0.3C.
The determination method of automobile-used Ni-MH power cell packet of the invention true charged holding and corresponding voltage, by substep into
The test of row battery charging and discharging, the thermal conductivity for avoiding battery charging and discharging from generating causes the error of test, and combines cell reaction thermodynamics
The relationship of battery capacity and voltage is demarcated, it is ensured that the association of the true charged holding of test and voltage relationship between the two
Property, reasonability.The method of the present invention can accurately determine the true charged holding of automobile-used Ni-MH power cell packet, while accurate true
Voltage corresponding to fixed true charged holding, in this way, the SOC SC service ceiling value of automobile-used Ni-MH power cell packet only need to accurately be determined
With use lower limit value, can accurately determine its corresponding voltage value, it is more accurate to provide for battery management system control strategy
The both ends SOC protection and 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 packet as far as possible in scope of design, is conducive to Ni-MH power cell packet and preferably applied using section
In on hybrid vehicle, battery is avoided to be abused.
Specific embodiment
The invention will be further described with reference to embodiments, but the invention is not limited to the statements of embodiment.
Embodiment 1
A kind of determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage, takes qualified power electric
Chi Bao, monomer battery are D6000, and power battery pack is 8 and 396 string combinations, that is, the single battery number being serially connected is 396
Only, the rated capacity C of power battery packVolumeFor 48Ah, in environment temperature TIfFor at 25 DEG C, after shelving 3h, according to the following steps into
Row:
I charges to the 50% of rated capacity, after shelving 3h using the charging current of 0.2C, is continued using the charging current of 1C
Charging, stopping when charging voltage reaches 633.6V or charging capacity reaches 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 processIt fills, after shelving 3h, use 0.2C's
Discharge current is discharged to 396V；After shelving 3h, volume test is carried out using 0.2C charging and discharging currents, obtains power battery pack at this time
Discharge capacity CReal _ 1；According to formula (1) calculate power battery pack between carried charge 50%~100% any time it is true
Charged holding SOCVery _ 1, the power battery pack moment true charged holding SOCVery _ 1Corresponding voltage URight _ 1It is counted according to formula (2)
It obtains:
SOCVery _ 1=((50% × CVolume+CIt fills)/CReal _ 1) × 100% ... ... ... ... ... (1)
URight _ 1=U1+ (T1-TIf) × (N × R) ... ... ... ... ... ... (2) II use the charging of 0.2C
Electric current charges to the 50% of rated capacity, after shelving 3h, is discharged to 396V using the discharge current of 1C, puts every 0.1 second record
Corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell C in electric processIt puts；After shelving 3h, discharged using 0.2C electric
Stream first puts remnants, carries out volume test using 0.2C charging and discharging currents later, obtains the discharge capacity of power battery pack at this time
CReal _ 2；The true charged holding of power battery pack any time between carried charge 0%~50% is calculated according to formula (3)
SOCVery _ 2, the power battery pack moment true charged holding SOCVery _ 2Corresponding voltage URight _ 2It is calculated according to formula (4):
SOCVery _ 2=((50% × CVolume- CIt puts)/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 single battery number being serially connected in power battery pack；
C in formula (1), formula (3)VolumeFor the rated capacity of power battery pack, R is the substance partial molal entropy of single battery.
It is assumed that the U1 for obtaining certain moment from step I is 569.25V, T1 is 26.5 DEG C, CIt fillsFor 20.2Ah, CReal _ 1For
49.1Ah, according to the environment temperature of setting and the corresponding Entropy Changes △ of charging currentrIt is 0.0036V/ that R, which is calculated, by formula (5) in S
DEG C, data are substituted into formula (1) and are calculated, SOCVery _ 1It is 90%；Data are substituted into formula (2) and are calculated, SOCVery _ 1
Corresponding voltage URight _ 1For 571.4V.Similarly, power battery pack can be obtained between carried charge 50%~100% any time
True charged holding SOCVery _ 1And SOCVery _ 1Corresponding voltage URight _ 1。
It is assumed that the U2 for obtaining certain moment from step II is 475.53V, T2 is 26.1 DEG C, CIt putsFor 19Ah, CReal _ 2For
49.1Ah, according to the environment temperature of setting and the corresponding Entropy Changes △ of discharge currentrIt is 0.001 that R, which is calculated, by formula (5) in S, will
Data are substituted into formula (3) and are calculated, SOCVery _ 2It is 10.2%；Data are substituted into formula (4) and are calculated, SOCVery _ 2Institute
Corresponding voltage URight _ 2It is 475.1.Similarly, the true lotus for any time that power battery pack can be obtained between carried charge 0%~50%
Electricity keeps SOCVery _ 2And SOCVery _ 2Corresponding voltage URight _ 2。
Embodiment 2
A kind of determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage, method and embodiment
Method in 1 is similar, the difference is that:
1, shelving the time is 4h；
2, in step I, 50% charging current for charging to rated capacity is 0.5C, and the charging current for continuing charging is
5C continues corresponding cell voltage U1, battery temperature T1 and battery charge capacity C in charging process every 0.5 second recordIt fills, put
Electric current is 0.5C.
3, in step II, 50% charging current for charging to rated capacity is 0.5C, discharge current 5C, every 0.5
Corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell C in second record discharge processIt puts。
Embodiment 3
A kind of determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage, method and embodiment
Method in 1 is similar, the difference is that:
1, shelving the time is 5h；
2, in step I, 50% charging current for charging to rated capacity is 1C, and the charging current for continuing charging is 10C,
Continue corresponding cell voltage U1, battery temperature T1 and battery charge capacity C in charging process every 1 second recordIt fills, discharge current
For 0.5C.
3, in step II, 50% charging current for charging to rated capacity was 1C, discharge current 10C, every 1 second
Record corresponding cell voltage U2, battery temperature T2 and discharge capacity of the cell C in discharge processIt puts。
Claims (3)
1. a kind of determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage, it is characterised in that: take conjunction
The power battery pack of lattice, in certain environment temperature TIfUnder, it shelves after a certain period of time, sequentially includes the following steps:
I charges to the 50% of rated capacity using the charging current of 0.2C~1C, shelves after a certain period of time, uses 0.5C~10C
Charging current continue to charge, until charging voltage reaches N*1.6V or stopping 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 intervalsIt fills, put
It sets after a certain period of time, is discharged to N*1.0V using the discharge current of 0.2C~0.5C；It shelves after a certain period of time, uses standard charge and discharge
Electric current carries out volume test, obtains the discharge capacity C of power battery pack at this timeReal _ 1；Power battery pack is calculated according to formula (1)
The true charged holding SOC of any time between carried charge 50%~100%Very _ 1, the power battery pack moment true charged guarantor
Hold SOCVery _ 1Corresponding voltage URight _ 1It is calculated according to formula (2):
SOCVery _ 1=((50% × CVolume+CIt fills)/CReal _ 1) × 100% ... ... ... ... ... (1)
URight _ 1=U1+ (T1-TIf)×(N×R)…………………………………(2)
II charges to the 50% of rated capacity using the charging current of 0.2C~1C, shelves after a certain period of time, uses 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 CIt puts；It shelves after a certain period of time, first puts remnants, carry out volume test using standard charging and discharging currents later,
Obtain the discharge capacity C of power battery pack at this timeReal _ 2；According to formula (3) calculate power battery pack carried charge 0%~50% it
Between any time true charged holding SOCVery _ 2, the power battery pack moment true charged holding SOCVery _ 2Corresponding voltage URight _ 2
It is calculated according to formula (4):
SOCVery _ 2=((50% × CVolume- CIt puts)/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 single battery number being serially connected in power battery pack；Formula
(1), the C in formula (3)VolumeFor the rated capacity of power battery pack, R is the substance partial molal entropy of single battery.
2. the determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage as described in claim 1,
It is characterized in that: described to shelve the time as 3~5h.
3. the determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage as claimed in claim 1 or 2,
It is characterized by: the charging current using 0.5C~10C in the step I continues corresponding cell voltage in charging process
U1, battery temperature T1 and battery charge capacity CIt fillsRecord time interval be 0.1~1 second；0.5C is used 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~10CIt putsRecord when
Between between be divided into 0.1~1 second.
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| CN108931726A (en) * | 2017-05-26 | 2018-12-04 | 神华集团有限责任公司 | SOC determines method and device, battery management system |
| CN108287318A (en) * | 2018-01-30 | 2018-07-17 | 上海华普汽车有限公司 | A kind of detection method and detecting system based on power cell of vehicle packet |
| CN108828455B (en) * | 2018-07-11 | 2020-10-13 | 湖南科霸汽车动力电池有限责任公司 | Method for determining real SOC of vehicle-mounted nickel-metal hydride battery pack on line |
| 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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