CN107015155A - A kind of battery of electric vehicle SOH measuring method and device - Google Patents
A kind of battery of electric vehicle SOH measuring method and device Download PDFInfo
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- CN107015155A CN107015155A CN201710183896.5A CN201710183896A CN107015155A CN 107015155 A CN107015155 A CN 107015155A CN 201710183896 A CN201710183896 A CN 201710183896A CN 107015155 A CN107015155 A CN 107015155A
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000003869 coulometry Methods 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 101001033754 Homo sapiens Mediator of RNA polymerase II transcription subunit 31 Proteins 0.000 description 2
- 102100039122 Mediator of RNA polymerase II transcription subunit 31 Human genes 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a kind of battery of electric vehicle SOH measuring method, comprise the following steps：S1：The SOH value of present battery, SOH are measured by circulating battery coulometry1=1 Q/ (5Qt)；Wherein, Q is the accumulated discharge amount of battery, and Qt is discharge capacity of the battery in the range of life cycle；S2：The SOH value of present battery, SOH are measured by volumetric method2=QN/QC, QN are the maximum capacity of present battery, and QC is the nominal capacity of battery；S3：Judge SOH1With SOH2It is whether identical；If identical, real-time battery SOH value is SOH1；If differing, Qt is modified, revised Qt=Q/ (5 (1 SOH2)), calculate SOH further according to revised Qt1.Compared to prior art, the characteristics of present invention is by combining circulation coulometry and volumetric method carries out high-precision real-time monitoring so as to realize to battery.
Description
Technical field
The present invention relates to electric automobiles, particularly a kind of battery of electric vehicle SOH measuring method and device.
Background technology
One battery bag or battery pack, as continuous charge and discharge cycles are used, battery capacity can constantly reduce, battery
Continuous aging, this judges that the index of cell degradation is exactly SOH (cell health state).Monitor battery SOH states can and
Shi Zhidao battery aging status, carries out the maintenance of battery pack and changes battery in time.
Test battery SOH method has following several at present：One kind is, from cell degradation mechanistic point, to study capacity attenuation
Increase the relation with SOH with internal resistance；One kind is, from experimental viewpoint, to be tested by standard testing, determined off-line battery SOH；
One kind is to set up battery model, and the internal resistance of cell, electric capacity etc. are known using such as least square method, Kalman filtering scheduling algorithm
Not, SOH is calculated.
However, prior art still has following technological deficiency：
1st, because internal resistance of cell distribution is more dispersed, internal resistance difference is than larger, internal resistance and SOH relation between different batteries
There is no versatility.
2nd, standard test, which surveys SOH, needs off-line test, wastes time and energy, and needs special test equipment, with high costs, and electricity
Pond bag testing cost is bigger.
3rd, battery model method algorithm is complicated, and battery model sets up difficult, it is difficult to obtain good application in practice.
The content of the invention
It is an object of the invention to the shortcoming and deficiency for overcoming prior art, there is provided a kind of battery of electric vehicle SOH survey
Calculate method and device.
The present invention is realized by following scheme：A kind of battery of electric vehicle SOH measuring method, comprises the following steps：
S1：The SOH value of present battery, SOH are measured by circulating battery coulometry1=1-Q/ (5Qt)；Wherein, Q is battery
Accumulated discharge amount, Qt be discharge capacity of the battery in the range of life cycle；
S2：The SOH value of present battery, SOH are measured by volumetric method2=QN/QC, QN are the maximum capacity of present battery,
QC is the nominal capacity of battery；
S3：Judge SOH1With SOH2It is whether identical；If identical, real-time battery SOH value is SOH1；If differing, to Qt
It is modified, revised Qt=Q/ (5 (1-SOH2)), calculate SOH further according to revised Qt1。
Compared to prior art, the characteristics of present invention is by combining circulation coulometry and volumetric method, so as to realize to battery
Carry out high-precision real-time monitoring.
As a further improvement on the present invention, the step S1 includes：
S11：Obtain discharge capacity Qt of the battery in the range of life cycle, the life cycle of the battery for SOH value from
100% drops to 80%；
S12：The accumulated discharge amount Q of battery is added up；
S13：Calculate the SOH value of present battery, SOH1=1-Q/ (5Qt).
As a further improvement on the present invention, the accumulated discharge of battery is calculated in the step S12 by current integration method
Measure Q.
As a further improvement on the present invention, the step S2 includes：
S21：Record the SOC initial values SOCini and end value SOCend of the battery in a charging process；
S22：The electric quantity change amount DQ in this charging process is calculated, battery maximum capacity QN=DQ/ (SOCend- are obtained
SOCini)；
S23：The SOH value of battery, SOH2=QN/QC are obtained, QC is the nominal capacity of battery.
As a further improvement on the present invention, in the step S21, when charging start and charging end temp 25 DEG C ±
5℃。
As a further improvement on the present invention, by the electricity of current integration method counting cell charging in the step S22
Variable quantity DQ.
Present invention also offers a kind of battery of electric vehicle SOH measuring and calculating device, including
First battery SOH value computing module, the SOH value for calculating present battery by circulating battery coulometry, SOH1
=1-Q/ (5Qt)；Wherein, Q is the accumulated discharge amount of battery, and Qt is discharge capacity of the battery in the range of life cycle；
Second battery SOH value computing module, the SOH value for measuring present battery by volumetric method, SOH2=QN/QC,
QN is the maximum capacity of present battery, and QC is the nominal capacity of battery；
SOH value judgment amendment module, for judging whether SOH1 and SOH2 is identical；If identical, real-time battery SOH value is
SOH1；If differing, Qt is modified, revised Qt=Q/ (5 (1-SOH2)), calculated further according to revised Qt
SOH1。
As a further improvement on the present invention, the first battery SOH value computing module includes：
Discharge capacity acquisition module, for obtaining discharge capacity Qt of the battery in the range of life cycle, the life of the battery
Cycle is that SOH value drops to 80% from 100%；
Accumulation module, is added up for the accumulated discharge amount Q to battery；
First computing module, the SOH value for calculating present battery, SOH1=1-Q/ (5Qt).
As a further improvement on the present invention, the second battery SOH value computing module includes：
Logging modle, the SOC initial values SOC for recording the battery in charging processiniWith end value SOCend；
Battery maximum capacity acquisition module, for calculating the electric quantity change amount DQ in charging process, obtains battery maximum and holds
Measure QN=DQ/ (SOCend-SOCini)；
Second computing module, the SOH value of battery, SOH are obtained for calculating2=QN/QC, QC are the nominal capacity of battery.
As a further improvement on the present invention, battery starts and charged the temperature terminated at 25 DEG C ± 5 DEG C in charging.
To sum up, the present invention is simple and practical, and algorithm parameter can be easier to obtain, and be not required to exclusively carry out a large amount of test experiments.It is logical
Battery SOH change can be monitored in real time by crossing ring coulometry, and volumetric method can correct the parameter of circulation coulometry, so as to improve
SOH estimation precisions.
In order to more fully understand and implement, the invention will now be described in detail with reference to the accompanying drawings.
Brief description of the drawings
Fig. 1 is the step flow chart of the battery of electric vehicle SOH of present invention measuring method.
Fig. 2 is the battery of electric vehicle SOH of present invention measuring and calculating device connection block diagram.
Embodiment
With reference to embodiments and accompanying drawing the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
In order to which the battery to electric car is detected in real time, the present invention is electric there is provided one kind for the defect of prior art
Motor-car battery SOH measuring method, mainly by combining circulation electricity hair and volumetric method, is more precisely carried out in real time with reaching
The purpose of monitoring.It is introduced especially by following examples：
Referring to Fig. 1, its step flow chart for the battery of electric vehicle SOH of present invention measuring method.The electricity of the present invention
Motor-car battery SOH measuring methods, specifically include following steps：
S1：The SOH value of present battery, SOH are measured by circulating battery coulometry1=1-Q/ (5Qt)；Wherein, Q is battery
Accumulated discharge amount, Qt be discharge capacity of the battery in the range of life cycle.
Further, in this step S1, realized especially by following steps：
S11：Obtain discharge capacity Qt of the battery in the range of life cycle, the life cycle of the battery for SOH value from
100% drops to 80%.Here life cycle is the standard for the battery of electric vehicle life-span, the general battery for working as electric car
SOH value drops to
S12：The accumulated discharge amount Q of battery is added up.Preferably, in the present embodiment especially by current integration method
Calculate the accumulated discharge amount Q of battery.
S13：Calculate the SOH value of present battery, SOH1=1-Q/ (5Qt).
For this step S1, it can be entered typically before battery dispatches from the factory using battery cycle life method battery progress SOH value
Row measuring and calculating.
S2：The SOH value of present battery, SOH are measured by volumetric method2=QN/QC, QN are the maximum capacity of present battery,
QC is the nominal capacity of battery.
Further, in this step S2, realized especially by following steps：
S21：Record the SOC initial values SOC of the battery in a charging processiniWith end value SOCend.Specifically, battery
Need to meet in charging process：When charging starts and charged end temp at 25 DEG C ± 5 DEG C, maximum charging current is less than
0.5C。
S22：The electric quantity change amount DQ in this charging process is calculated, battery maximum capacity QN=DQ/ (SOC are obtainedend-
SOCini).Preferably, by the electric quantity change amount DQ of current integration method counting cell charging in this step.
S23：Obtain the SOH value of battery, SOH2=QN/QC, QC are the nominal capacity of battery.
It is to be had been loaded into for battery on electric car in this step S2, the battery management during the charging of battery
System can in real time be shown to the SOC value of battery.
S3：Judge SOH1With SOH2It is whether identical；If identical, real-time battery SOH value is SOH1；If differing, to Qt
It is modified, revised Qt=Q/ (5 (1-SOH2)), calculate SOH further according to revised Qt1。
Please refer to Fig. 2, it connects block diagram for the battery of electric vehicle SOH of present invention measuring and calculating device.On realizing
Battery of electric vehicle SOH measuring method is stated, present invention also offers a kind of battery of electric vehicle SOH measuring and calculating device, is specifically included：
First battery SOH value computing module 1, the second battery SOH value computing module 2 and SOH value judgment amendment module 3.
The first battery SOH value computing module 1, the SOH value for calculating present battery by circulating battery coulometry,
SOH1=1-Q/ (5Qt)；Wherein, Q is the accumulated discharge amount of battery, and Qt is discharge capacity of the battery in the range of life cycle.
Specifically, the first battery SOH value computing module 1 includes：Discharge capacity acquisition module 11, the and of accumulation module 12
First computing module 13.
The discharge capacity acquisition module 11, for obtaining discharge capacity Qt of the battery in the range of life cycle, the battery
Life cycle drop to 80% from 100% for SOH value.
The accumulation module 12, is added up for the accumulated discharge amount Q to battery.
First computing module 13, the SOH value for calculating present battery, SOH1=1-Q/ (5Qt).
The second battery SOH value computing module 2, the SOH value for measuring present battery by volumetric method, SOH2=
QN/QC, QN are the maximum capacity of present battery, and QC is the nominal capacity of battery.
Specifically, the second battery SOH value computing module 2 includes：Logging modle 21, battery maximum capacity obtain mould
The computing module 23 of block 22 and second.
The logging modle 21, the SOC initial values SOC for recording the battery in charging processiniWith end value SOCend。
Specifically, battery starts and charged the temperature terminated at 25 DEG C ± 5 DEG C in charging, maximum charging current is less than 0.5C.
The battery maximum capacity acquisition module 22, for calculating the electric quantity change amount DQ in charging process, obtains battery
Maximum capacity QN=DQ/ (SOCend-SOCini)。
Second computing module 23, the SOH value of battery, SOH are obtained for calculating2=QN/QC, QC are nominal for battery
Capacity.
The SOH value judgment amendment module 3, for judging SOH1With SOH2It is whether identical；If identical, real-time battery SOH
It is worth for SOH1；If differing, Qt is modified, revised Qt=Q/ (5 (1-SOH2)), counted further according to revised Qt
Calculate SOH1。
Compared to prior art, the present invention is simple and practical, and algorithm parameter can be easier to obtain, and be not required to exclusively carry out big measurement
Examination experiment.Battery SOH change can be monitored in real time by ring coulometry, volumetric method can correct the parameter of circulation coulometry,
So as to improve SOH estimation precisions.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of battery of electric vehicle SOH measuring method, it is characterised in that：Comprise the following steps：
S1：The SOH value of present battery, SOH are measured by circulating battery coulometry1=1-Q/ (5Qt)；Wherein, Q is the tired of battery
Discharge capacity is counted, Qt is discharge capacity of the battery in the range of life cycle；
S2：The SOH value of present battery, SOH are measured by volumetric method2=QN/QC, QN are the maximum capacity of present battery, and QC is electricity
The nominal capacity in pond；
S3：Judge SOH1With SOH2It is whether identical；If identical, real-time battery SOH value is SOH1；If differing, Qt is carried out
Amendment, revised Qt=Q/ (5 (1-SOH2)), calculate SOH further according to revised Qt1。
2. battery of electric vehicle SOH measuring method according to claim 1, it is characterised in that：The step S1 includes：
S11：Obtain discharge capacity Qt of the battery in the range of life cycle, the life cycle of the battery is SOH value under 100%
It is down to 80%；
S12：The accumulated discharge amount Q of battery is added up；
S13：Calculate the SOH value of present battery, SOH1=1-Q/ (5Qt).
3. battery of electric vehicle SOH measuring method according to claim 1, it is characterised in that：Pass through peace in the step S12
When integration method calculate battery accumulated discharge amount Q.
4. battery of electric vehicle SOH measuring method according to claim 1, it is characterised in that：The step S2 includes：
S21：Record the SOC initial values SOC of the battery in a charging processiniWith end value SOCend；
S22：The electric quantity change amount DQ in this charging process is calculated, battery maximum capacity QN=DQ/ (SOC are obtainedend-
SOCini)；
S23：Obtain the SOH value of battery, SOH2=QN/QC, QC are the nominal capacity of battery.
5. battery of electric vehicle SOH measuring method according to claim 4, it is characterised in that：In the step S21, when filling
Beginning and charging end temp are established by cable at 25 DEG C ± 5 DEG C.
6. battery of electric vehicle SOH measuring method according to claim 4, it is characterised in that：Pass through peace in the step S22
When integration method counting cell charging electric quantity change amount DQ.
7. a kind of battery of electric vehicle SOH measuring and calculating device, it is characterised in that：Including
First battery SOH value computing module, the SOH value for calculating present battery by circulating battery coulometry, SOH1=1-Q/
(5Qt)；Wherein, Q is the accumulated discharge amount of battery, and Qt is discharge capacity of the battery in the range of life cycle；
Second battery SOH value computing module, the SOH value for measuring present battery by volumetric method, SOH2=QN/QC, QN are to work as
The maximum capacity of preceding battery, QC is the nominal capacity of battery；
SOH value judgment amendment module, for judging SOH1With SOH2It is whether identical；If identical, real-time battery SOH value is SOH1；
If differing, Qt is modified, revised Qt=Q/ (5 (1-SOH2)), calculate SOH further according to revised Qt1。
8. battery of electric vehicle SOH measuring and calculating device according to claim 7, it is characterised in that：The first battery SOH value meter
Calculating module includes：
Discharge capacity acquisition module, for obtaining discharge capacity Qt of the battery in the range of life cycle, the life cycle of the battery
For SOH value 80% is dropped to from 100%；
Accumulation module, is added up for the accumulated discharge amount Q to battery；
First computing module, the SOH value for calculating present battery, SOH1=1-Q/ (5Qt).
9. battery of electric vehicle SOH measuring and calculating device according to claim 1, it is characterised in that：The second battery SOH value meter
Calculating module includes：
Logging modle, the SOC initial values SOC for recording the battery in charging processiniWith end value SOCend；
Battery maximum capacity acquisition module, for calculating the electric quantity change amount DQ in charging process, obtains battery maximum capacity QN
=DQ/ (SOCend-SOCini)；
Second computing module, the SOH value of battery, SOH are obtained for calculating2=QN/QC, QC are the nominal capacity of battery.
10. battery of electric vehicle SOH measuring and calculating device according to claim 9, it is characterised in that：Battery starts and filled in charging
The temperature that electricity terminates is at 25 DEG C ± 5 DEG C.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742755A (en) * | 2017-09-27 | 2018-02-27 | 安徽江淮汽车集团股份有限公司 | Electric automobile SOH modification methods and device |
| CN109061511A (en) * | 2018-09-20 | 2018-12-21 | 苏州艾思控科技有限公司 | The method of battery cell SOH is calculated in a kind of battery management system in real time |
| CN109407008A (en) * | 2018-10-12 | 2019-03-01 | 安徽江淮汽车集团股份有限公司 | A kind of modification method of electric car SOH |
| CN110568375A (en) * | 2019-09-03 | 2019-12-13 | 昆山宝创新能源科技有限公司 | SOH (state of health) determination method and device for power battery |
| CN111965558A (en) * | 2020-07-22 | 2020-11-20 | 宝能(广州)汽车研究院有限公司 | SOH value acquisition method and system, electric vehicle and computer-readable storage medium |
| CN112285462A (en) * | 2020-10-13 | 2021-01-29 | 安徽锐能科技有限公司 | Testing device and method for battery management system and storage medium |
| WO2021238228A1 (en) * | 2020-05-28 | 2021-12-02 | 江苏大学 | "standardized temperature"-based online estimation method for state of health of battery within wide temperature range |
| CN115407211A (en) * | 2022-11-01 | 2022-11-29 | 北京航空航天大学 | A method and system for online prediction of the state of health of lithium batteries for electric vehicles |
| WO2023169134A1 (en) * | 2022-03-07 | 2023-09-14 | 宁德时代新能源科技股份有限公司 | Battery soh value calculation model generation method, battery soh value calculation method, apparatus, and system |
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| CN111965558B (en) * | 2020-07-22 | 2023-01-31 | 宝能(广州)汽车研究院有限公司 | SOH value acquisition method and system, electric vehicle and computer readable storage medium |
| CN112285462A (en) * | 2020-10-13 | 2021-01-29 | 安徽锐能科技有限公司 | Testing device and method for battery management system and storage medium |
| WO2023169134A1 (en) * | 2022-03-07 | 2023-09-14 | 宁德时代新能源科技股份有限公司 | Battery soh value calculation model generation method, battery soh value calculation method, apparatus, and system |
| CN115407211A (en) * | 2022-11-01 | 2022-11-29 | 北京航空航天大学 | A method and system for online prediction of the state of health of lithium batteries for electric vehicles |
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| CN107015155B (en) | 2019-09-17 |
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