CN105738824B - A kind of battery remaining power evaluation method - Google Patents
A kind of battery remaining power evaluation method Download PDFInfo
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- CN105738824B CN105738824B CN201610108586.2A CN201610108586A CN105738824B CN 105738824 B CN105738824 B CN 105738824B CN 201610108586 A CN201610108586 A CN 201610108586A CN 105738824 B CN105738824 B CN 105738824B
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- 238000011156 evaluation Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 4
- RQKYYWBMXHYBAP-UHFFFAOYSA-N 4-(chloromethyl)-2,2-dimethyl-1,3,2-dioxasilolane Chemical compound C[Si]1(C)OCC(CCl)O1 RQKYYWBMXHYBAP-UHFFFAOYSA-N 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 11
- 238000000205 computational method Methods 0.000 claims description 8
- 230000010354 integration Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 238000012937 correction Methods 0.000 abstract description 2
- 230000002999 depolarising effect Effects 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
-
- 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 invention discloses a kind of battery remaining power evaluation method, this method step is followed successively by：Battery remaining power is calculated according to the charging and discharging currents of battery bag；If battery bag static condition exceedes the scheduled time, detection open-circuit voltage OCV；Calculate the variable quantity of battery remaining power and the variable quantity according to open-circuit voltage computation of table lookup battery remaining power in each time cycle；Battery capacity decaying weight value is calculated according to two variable quantities that above-mentioned calculating is obtained；Present battery residual capacity is calculated according to weighted value and the battery remaining power of previous moment.The inventive method shows the attenuation trend of battery capacity by weighted value, and introduces the weighted value in the calculating of remaining battery capacity, while error correction is carried out, so as to realize the accurate estimation to battery remaining power；As long as this method eligible renewal with regard to carrying out residual capacity when battery management system is run.The present invention can be widely applied to battery bag management domain as a kind of battery remaining power evaluation method.
Description
Technical field
The present invention relates to battery system management domain, especially a kind of battery remaining power evaluation method.
Background technology
, it is necessary to accurately estimate the residual capacity (SOC) of battery bag in the battery management system of electric automobile.Only clearly work as
The Expenditure Levels of preceding electricity, the mileage for continuing to travel can be travelled so as to estimate out vehicle.If, it is impossible to accurate estimation
SOC may have battery bag and cross the danger for putting monomer, cause battery bag monomer is too low to cause irreversible injury in itself to battery,
So as to be produced a very large impact to battery life.It will be seen that how many electricity filled in the case of accurately estimation SOC, can release how much
Electricity.How much gasoline can have been added as conventional gasoline car is the same, can accurately estimate vehicle can travel how far.
Under normal circumstances accurate estimation SOC need it is strict know battery bag it is fully charged in the case of total capacity.But use
Family is difficult then the accurate capacity situation for understanding battery bag using electric automobile.Even in laboratory in test battery capacity feelings
Under condition, the initial capacity of battery is affected by various factors：The duration that dispatches from the factory of battery core, the charge and discharge cycles number of times of battery core, temperature
Degree etc..The SOC of battery still can not be judged well from these factors, and its problem is the high temperature storage longevity for considering battery
Life, cell load situation, depth of discharge, charge-discharge magnification etc..SOC can not accurately be estimated, it is likely that cause battery always
When big load, big depth of discharge, have a significant impact to the life-span of battery.
The content of the invention
In order to solve the above-mentioned technical problem, the purpose of the present invention is：One kind is provided and is in running status for accurately estimating
In battery remaining power method.
The technical solution adopted in the present invention is：A kind of battery remaining power evaluation method, includes following steps：
A, according to the charging and discharging currents of battery bag calculate battery remaining power SOC (Ah)；
If B, battery bag static condition exceed the scheduled time, detection open-circuit voltage OCV；
C, calculate in each time cycle the variation delta SOC (Ah) of battery remaining power and tabled look-up according to open-circuit voltage
Calculate the variation delta SOC (ocv) of battery remaining power；
D, calculate battery capacity decaying weight value W according to calculating obtained two variable quantities in step C；
E, present battery residue is calculated according to battery capacity decaying weight value W and the battery remaining power of previous moment held
Amount.
Further, the battery capacity used is calculated in the step A using Current integrating method according to charging and discharging currents, and
Calculate battery remaining power.
Further, the static condition in the step B is that the absolute value that electric current is exported is less than 1A.
Further, battery capacity decaying weight value W computational methods are in the step D：
Wherein, K1、K2、K3It is offset constant, SOC (Ah)ErrorFor battery cell voltage measurement error, SOC
(ocv)ErrorFor battery cell open-circuit voltage error, SOC (ocv)ErrorPMissed for the battery cell open-circuit voltage of upper a period of time
Difference.
Further, the battery cell voltage measurement error SOC (Ah)ErrorComputational methods be：
SOC(Ah)Error=∫ (gI+k) dt,
Wherein, g is current error gain, and I is charging and discharging currents, and k is offset.
Further, in the step E, present battery residual capacity SOC (Ah)presentComputational methods be：
SOC(Ah)present=1- (battery capacity used/battery system total capacity),
Wherein, the battery capacity used is calculated according to the charging and discharging currents of battery bag using Ah integration methods, described
Battery bag total capacity is the battery bag total capacity of previous time period and battery capacity decaying weight value W product.
The beneficial effects of the invention are as follows：The inventive method shows the attenuation trend of battery capacity by weighted value, and
The weighted value is introduced during the calculating of remaining battery capacity, error correction is carried out in calculating process, so as to realize to remaining battery
The accurate estimation of capacity；As long as this method eligible renewal with regard to carrying out residual capacity when battery management system is run.
Brief description of the drawings
Fig. 1 is the total flow chart of steps of the inventive method；
Fig. 2 is battery management system structured flowchart of the present invention.
Embodiment
The embodiment to the present invention is described further below in conjunction with the accompanying drawings：
A kind of reference picture 1, battery remaining power evaluation method, includes following steps：
A, according to the charging and discharging currents of battery bag calculate battery remaining power SOC (Ah)；
If B, battery bag static condition exceed the scheduled time, detection open-circuit voltage OCV；
C, calculate in each time cycle the variation delta SOC (Ah) of battery remaining power and tabled look-up according to open-circuit voltage
Calculate the variation delta SOC (ocv) of battery remaining power；
D, calculate battery capacity decaying weight value W according to calculating obtained two variable quantities in step C；
E, present battery residue is calculated according to battery capacity decaying weight value W and the battery remaining power of previous moment held
Amount.
Battery management system structure as shown in Fig. 2 include battery bag (or single battery), by temperature sensor,
Voltage sensor, current sensor obtain battery bag current information, are entered after being changed by ADC in MCU processors.Processor
MCU external clocks circuit, display device and storage device.
It is further used as preferred embodiment, is calculated in the step A according to charging and discharging currents using Current integrating method
The battery capacity used, and calculate battery remaining power.
Current integrating method obtains battery system current size by current sensor, then by periodic electric current and time
Value product accumulation is obtained, following I (t1) * t1+I (t2) * (t2-t1) ... I (tn) * (tn-t (n-1)).In order to ensure the standard of integration
True property, period of time T is typically in below 100ms, i.e. t1=t2-t1=...=(tn-t (n-1))<100ms.When I (tn) is tn
Carve current value.
It is further used as preferred embodiment, the static condition in the step B is that the absolute value that electric current is exported is less than
1A。
Think that battery bag is in static condition when current value is less than certain threshold values, such as vehicle is in halted state
There is no powerful device to use, electric current output absolute value is less than 1A, it is believed that battery bag is in static condition.The setting of threshold values
It is determined on a case-by-case basis, battery bag is influenceed to be construed as static condition under less current conditions.
After the time of repose sufficiently long time, OCV calculating is carried out by battery bag monomer voltage.Pass through t1 the and t2 moment
Calculate SOC (Ah)=SOC (Ah)t1-SOC(Ah)t2；Pass through t1 and t2 moment SOC (ocv)=SOC (ocv)t1-SOC
(ocv)t2。
It is further used as preferred embodiment, battery capacity decaying weight value W computational methods are in the step D：
Wherein, K1, K2, K3 are offset constant, SOC (Ah)ErrorFor battery cell voltage measurement error, SOC
(ocv)ErrorFor battery cell open-circuit voltage error, SOC (ocv)ErrorPMissed for the battery cell open-circuit voltage of upper a period of time
Difference.
SOC(ocv)ErrorFor battery cell voltage measurement error, the error causes OCV to table look-up generation error, and the difference is produced
Source mainly include following aspect：The time of repose length of battery, moment temperature conditions before standing, moment temperature before standing
Situation directly results in the time length required for battery cell depolarising.Such as in the case of 0 DEG C, the time required for depolarising
At 4 more than hour, monomer voltage measurement error at this time is smaller；In the case of 30 DEG C, the time ratio required for depolarising
It is shorter.If depolarising is incomplete, then SOC (ocv) Error error amounts are higher；, it is necessary to pass through electricity during practice
Chi Bao carries out Experimental Calibration.
Weighted value introduces the battery cell open-circuit voltage error SOC (ocv) of upper a period of time in calculatingErrorPBe in order to
Prevent OCV Watch Errors than causing SOC (ocv) in the case of largerErrorWeight accounting it is excessive.
It is further used as preferred embodiment, the battery cell voltage measurement error SOC (Ah)ErrorComputational methods
For：
SOC(Ah)Error=∫ (gI+k) dt,
Wherein, g is current error gain, and I is charging and discharging currents, and k is current measurement errors offset；Above-mentioned offset is normal
Number K1, K2, K3 and k need to obtain by demarcating during practice.
It is further used as preferred embodiment, in the step E, present battery residual capacity SOC (Ah)presentMeter
Calculation method is：
SOC(Ah)present=1- (battery capacity used/battery system total capacity),
Wherein, the battery capacity used is calculated according to the charging and discharging currents of battery bag using Ah integration methods, described
Battery bag total capacity is the battery bag total capacity of previous time period and battery capacity decaying weight value W product.
Above is the preferable implementation to the present invention is illustrated, but the invention is not limited to the implementation
Example, those skilled in the art can also make a variety of equivalents or replace on the premise of without prejudice to spirit of the invention
Change, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (4)
1. a kind of battery remaining power evaluation method, it is characterised in that：Include following steps：
A, according to the charging and discharging currents of battery bag calculate battery remaining power SOC (Ah)；
If B, battery bag static condition exceed the scheduled time, detection open-circuit voltage OCV；
C, calculate in each time cycle the variation delta SOC (Ah) of battery remaining power and according to open-circuit voltage computation of table lookup
The variation delta SOC (ocv) of battery remaining power；
D, calculate battery capacity decaying weight value W according to calculating obtained two variable quantities in step C；
E, present battery residual capacity calculated according to battery capacity decaying weight value W and the battery remaining power of previous moment；
Battery capacity decaying weight value W computational methods are in the step D：
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Wherein, K1、K2、K3It is offset constant, SOC (Ah)ErrorTo use the electricity that Ah integration methods are calculated according to charging and discharging currents
The measurement error of pond residual capacity, SOC (ocv)ErrorFor the measurement error of the battery remaining power calculated according to open-circuit voltage,
SOC(ocv)ErrorPFor the measurement error of the battery remaining power calculated according to open-circuit voltage of upper a period of time；
In the step E, present battery residual capacity SOC (Ah)presentComputational methods be：
SOC(Ah)present=1- (battery capacity used/battery system total capacity),
Wherein, the battery capacity used is calculated according to the charging and discharging currents of battery bag using Ah integration methods, the battery
Overall system capacity is the battery system total capacity of previous time period and battery capacity decaying weight value W product.
2. a kind of battery remaining power evaluation method according to claim 1, it is characterised in that：Basis in the step A
Charging and discharging currents calculate the battery capacity used using Current integrating method, and calculate battery remaining power.
3. a kind of battery remaining power evaluation method according to claim 1, it is characterised in that：It is quiet in the step B
Configuration state is that the absolute value that electric current is exported is less than 1A.
4. a kind of battery remaining power evaluation method according to claim 1, it is characterised in that：It is described electric according to discharge and recharge
The measurement error SOC (Ah) for the battery remaining power that stream is calculated using Ah integration methodsErrorComputational methods be：
SOC(Ah)Error=∫ (gI+k) dt,
Wherein, g is current error gain, and I is charging and discharging currents, and k is offset.
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| US10101402B2 (en) * | 2016-05-31 | 2018-10-16 | GM Global Technology Operations LLC | Estimation of battery power capability in a torque-generating system |
| KR102634815B1 (en) * | 2016-11-22 | 2024-02-07 | 삼성전자주식회사 | Method and apparatus for estimating state of battery based on error correction |
| CN106908730B (en) * | 2017-01-19 | 2019-08-23 | 浙江零跑科技有限公司 | A method of estimation lithium battery OCV_SOC calibration curve SOC error |
| CN107271905B (en) * | 2017-05-25 | 2019-12-27 | 上海思致汽车工程技术有限公司 | Battery capacity active estimation method for pure electric vehicle |
| 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 |
| CN108931727A (en) * | 2017-05-27 | 2018-12-04 | 广州小鹏汽车科技有限公司 | A kind of batteries of electric automobile Residual capacity prediction method and system |
| CN109061482B (en) * | 2018-06-28 | 2021-06-01 | 北京云数智汇科技有限公司 | Battery health degree prediction method and device |
| CN111257763B (en) * | 2018-11-30 | 2022-04-22 | 凹凸电子（武汉）有限公司 | Method and system for calculating remaining capacity of battery |
| CN111929596B (en) * | 2020-07-31 | 2023-04-25 | 蜂巢能源科技股份有限公司 | Method, device, storage medium and electronic equipment for obtaining battery capacity |
| CN112415402B (en) * | 2021-01-25 | 2021-04-27 | 浙江纽联科技有限公司 | Method and system for lithium battery capacity estimation and battery core abnormity prediction |
| CN113844332B (en) * | 2021-10-25 | 2023-03-24 | 徐州徐工挖掘机械有限公司 | Electric excavator, charging method and device for electric excavator and storage medium |
| CN114814604A (en) * | 2022-05-12 | 2022-07-29 | 苏州精控能源科技有限公司 | A method and device for estimating battery soc |
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