CN109407008A - A kind of modification method of electric car SOH - Google Patents
A kind of modification method of electric car SOH Download PDFInfo
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- CN109407008A CN109407008A CN201811191817.6A CN201811191817A CN109407008A CN 109407008 A CN109407008 A CN 109407008A CN 201811191817 A CN201811191817 A CN 201811191817A CN 109407008 A CN109407008 A CN 109407008A
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- soh
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The present invention provides the modification method and system of a kind of electric car SOH, this method comprises: the corresponding table of the SOH pad value of acquisition battery pack and accumulative charging ampere-hour value；The attenuation coefficient of the battery charge capacity under different temperatures is obtained by cycling life test；The cumulative charging ampere-hour of battery pack is obtained, and the cumulative charging ampere-hour of amendment is calculated according to the attenuation coefficient；According to the cumulative charging ampere-hour of amendment and the corresponding table, table look-up to obtain cycle life SOH pad value.The present invention solves the problems, such as the SOH value estimation inaccuracy of existing electric car, can improve the safety and intelligence that electric car uses.
Description
Technical field
The present invention relates to the modification method of batteries of electric automobile technical field more particularly to a kind of electric car SOH and it is
System.
Background technique
As power battery is in use with the continuous decaying of capacity, the difference of battery with two side terminals gradually becomes
Greatly, pure electric automobile battery pack SOH value is also constantly decaying.In electric vehicle driving process, it is desirable to be able to battery pack
Health status (SOH) is estimated, also remains that how many capacity can be used effectively to evaluate battery pack.If SOH accuracy is not high,
It will cause the inaccuracy of the state-of-charge (SOC) of battery, the estimation error of SOC is larger, may cause electric car halfway because of electricity
Amount is insufficient and is forced to stop.
The SOH value of battery can be obtained by test in laboratory, in battery not no laboratory in actual use
Various conditions can not directly obtain the SOH value of battery by measurement method, if by the battery recycling of electric car to laboratory
Carry out the measurement of SOH value, it will waste a large amount of manpower financial capacity.At present both at home and abroad to the accurate estimation of battery SOH aspect
It is made that a large amount of research, is mainly based upon the appraisal procedure of battery capacity and SOC or the internal resistance of cell, such as: method 1: battery
Monomer is based on internal resistance of cell SOH value=(battery cell scraps the practical internal resistance of internal resistance-battery cell)/(battery cell scraps internal resistance-
Battery cell factory internal resistance).Method 2:SOH=SOC1*Q3+Q2/Q1*100%, wherein Q1 is total when the battery pack is dispatched from the factory
Capacity；SOC1 is the state-of-charge of minimum monomer voltage single battery, and Q2 is that minimum monomer voltage battery is accumulative at the end of charging
The electricity being filled with, Q3 are to calculate minimum voltage single battery actually available capacity available at this time.
As it can be seen that in the prior art to the SOH of battery assessment be mainly according to battery management system SOC estimated value and
Batteries monomer voltage, monomer internal resistance measured value, the estimation accuracy of SOH value is high.
Summary of the invention
The present invention provides the modification method and system of a kind of electric car SOH, solves the SOH value estimation of existing electric car
The problem of inaccuracy, can improve the safety and intelligence that electric car uses.
In order to achieve the above object, the present invention the following technical schemes are provided:
A kind of modification method of electric car SOH, comprising:
The corresponding table of the SOH pad value of acquisition battery pack and accumulative charging ampere-hour value；
The attenuation coefficient of the battery charge capacity under different temperatures is obtained by cycling life test；
The cumulative charging ampere-hour of battery pack is obtained, and the cumulative charging ampere-hour of amendment is calculated according to the attenuation coefficient；
According to the cumulative charging ampere-hour of amendment and the corresponding table, table look-up to obtain cycle life SOH pad value.
Preferably, further includes:
The calendar life capacity attenuation tables of data of battery pack is obtained, the tables of data embodies SOC value, battery temperature and SOH
The corresponding relationship of pad value；
The SOC value and battery temperature of battery pack when vehicle is stood are acquired, and calendar life SOH is obtained according to the tables of data
Pad value；
It regard the sum of the cycle life SOH pad value and the calendar life SOH pad value as service life of battery pack
SOH pad value.
Preferably, the attenuation coefficient that the battery charge capacity under different temperatures is obtained by cycling life test, packet
It includes:
Battery temperature when detection charging starting, and obtain the battery after experience setting cycle-index at this temperature and charge and hold
Amount；
Using the battery charge capacity decaying corresponding as the battery temperature with the ratio of primary battery charging capacity
Coefficient.
It is preferably, described that the cumulative charging ampere-hour of amendment is calculated according to the attenuation coefficient, comprising:
Using the cumulative charging ampere-hour and the product of the attenuation coefficient as the cumulative charging ampere-hour of the amendment.
The present invention also provides the update the systems of electric car SOH a kind of, comprising:
First acquisition unit, for obtaining the corresponding table of the SOH pad value of battery pack with accumulative charging ampere-hour value；
Attenuation coefficient determination unit, for obtaining declining for the battery charge capacity under different temperatures by cycling life test
Subtract coefficient；
Corrected Calculation unit for obtaining the cumulative charging ampere-hour of battery pack, and is calculated according to the attenuation coefficient
The cumulative charging ampere-hour of amendment；
Cycle life decay calculation unit, for tabling look-up according to the cumulative charging ampere-hour of amendment and the corresponding table
To cycle life SOH pad value.
Preferably, further includes:
Second acquisition unit, for obtaining the calendar life capacity attenuation tables of data of battery pack, the tables of data embodies SOC
The corresponding relationship of value, battery temperature and SOH pad value；
Calendar life decay calculation unit, the SOC value and battery temperature of battery pack when for acquiring vehicle standing, and according to
The tables of data obtains calendar life SOH pad value；
Service life SOH decay calculation unit, for the cycle life SOH pad value and the calendar life SOH to be decayed
The sum of value is used as service life of battery pack SOH pad value.
Preferably, the attenuation coefficient determination unit includes:
Charging capacity calculates unit, for detecting battery temperature when charging starting, and obtains experience setting at this temperature
Battery charge capacity after cycle-index；
Ratio calculation unit, for using the ratio of the battery charge capacity and primary battery charging capacity as the battery temperature
Spend the corresponding attenuation coefficient.
The present invention provides the modification method and system of a kind of electric car SOH, passes through the cycling life test to battery pack
The attenuation coefficient for obtaining battery capacity is modified battery charging ampere-hour, and according to battery charging ampere-hour and SOH pad value
Corresponding table obtains cycle life SOH pad value.The SOH value estimation inaccuracy for solving the problems, such as existing electric car, can improve electricity
The safety and intelligence that electrical automobile uses.
Detailed description of the invention
In order to illustrate more clearly of specific embodiments of the present invention, attached drawing needed in the embodiment will be made below
Simply introduce.
Fig. 1: being the modification method schematic diagram of electric car SOH provided by the invention a kind of.
Specific embodiment
The scheme of embodiment in order to enable those skilled in the art to better understand the present invention with reference to the accompanying drawing and is implemented
Mode is described in further detail the embodiment of the present invention.
For current electric car to the problem of SOH estimation inaccuracy, the present invention provides the amendment of electric car SOH a kind of
Method and system obtain the attenuation coefficient of battery capacity by cycling life test to battery pack, to battery charge ampere-hour into
Row amendment, and cycle life SOH pad value is obtained with the corresponding table of SOH pad value according to battery charging ampere-hour.Solve existing electricity
The problem of the SOH value estimation inaccuracy of electrical automobile, can improve the safety and intelligence that electric car uses.
As shown in Figure 1, a kind of modification method of electric car SOH, comprising:
S1: the corresponding table of the SOH pad value of battery pack with accumulative charging ampere-hour value is obtained；
S2: the attenuation coefficient of the battery charge capacity under different temperatures is obtained by cycling life test；
S3: the cumulative charging ampere-hour of battery pack is obtained, and the cumulative charging peace of amendment is calculated according to the attenuation coefficient
When；
S4: it according to the cumulative charging ampere-hour of amendment and the corresponding table, tables look-up to obtain cycle life SOH pad value.
Specifically, the corresponding table of battery pack hand SOH pad value and accumulative charging ampere-hour value, certain model electricity as shown in Table 1
Pond corresponds to table.
Table 1
| Accumulative charging ampere-hour/Ah | SOH decline/% | Accumulative charging ampere-hour/Ah | SOH decline/% |
| 4500 | 1.5 | 72000 | 19.0 |
| 9000 | 3.0 | 76500 | 19.5 |
| 13500 | 4.8 | 81000 | 21.0 |
| 18000 | 6.5 | 85500 | 21.5 |
| 22500 | 7.4 | 90000 | 22.5 |
| 27000 | 8.5 | 94500 | 23.3 |
| 31500 | 9.4 | 99000 | 24.0 |
| 36000 | 10.5 | 103500 | 24.8 |
| 40500 | 12.0 | 108000 | 25.5 |
| 45000 | 13.0 | 112500 | 26.3 |
| 49500 | 14.2 | 117000 | 27.0 |
| 54000 | 16.0 | 121500 | 27.8 |
| 58500 | 16.7 | 126000 | 28.5 |
| 63000 | 17.5 | 130500 | 29.3 |
| 67500 | 18.5 | 135000 | 30.0 |
| 72000 | 19.0 | / | / |
Different temperatures can be set and correspond to attenuation coefficient as K1, K2, K3 and K4, such as: originating Tmax >=35 DEG C when detecting to charge
When, this cumulative charging ampere-hour is equal to the cumulative charging ampere-hour * K1 of this fast charge (or trickle charge).When detect charging starting 25 DEG C≤
When Tmax≤35 DEG C, this cumulative charging ampere-hour is equal to the cumulative charging ampere-hour * K2 of this fast charge (or trickle charge).It charges when detecting
When originating 10 DEG C≤Tmax≤25 DEG C, this cumulative cumulative charging ampere-hour * K3 of charging ampere-hour=this fast charge (or trickle charge).Work as inspection
When measuring charging starting Tmax≤10 DEG C, this cumulative cumulative charging ampere-hour * K4 of charging ampere-hour=this fast charge (or trickle charge).
Further, this method further include:
S5: obtaining the calendar life capacity attenuation tables of data of battery pack, the tables of data embody SOC value, battery temperature and
The corresponding relationship of SOH pad value；
S6: the SOC value and battery temperature of battery pack when acquisition vehicle is stood, and calendar life is obtained according to the tables of data
SOH pad value；
S7: the sum of the cycle life SOH pad value and the calendar life SOH pad value are used into the longevity as battery pack
Order SOH pad value.
Specifically, shelf-lifeing at different temperatures, under difference SOC was declined according to 6-12 months calendar life capacity
Subtrahend evidence carries out linear fit with matlab software, predicts under under different temperatures, different SOC, 10 calendar service life declined
Subtract curve.It is obtained according to attenuation curve such as 2 data of table.
Table 2
The attenuation coefficient that the battery charge capacity under different temperatures is obtained by cycling life test, comprising: detection
Battery temperature when charging starting, and obtain the battery charge capacity after experience setting cycle-index at this temperature；By the electricity
Pond charging capacity and the ratio of primary battery charging capacity are as the corresponding attenuation coefficient of the battery temperature.
It is described that the cumulative charging ampere-hour of amendment is calculated according to the attenuation coefficient, comprising: by the cumulative charging ampere-hour
Product with the attenuation coefficient is as the cumulative charging ampere-hour of the amendment.
As it can be seen that the present invention provides the modification method of electric car SOH a kind of, obtained by the cycling life test to battery pack
The attenuation coefficient for taking battery capacity is modified battery charging ampere-hour, and according to pair of battery charging ampere-hour and SOH pad value
Table is answered to obtain cycle life SOH pad value.The SOH value estimation inaccuracy for solving the problems, such as existing electric car, can improve electronic
The safety and intelligence that automobile uses.
The present invention also provides the update the systems of electric car SOH a kind of, comprising: first acquisition unit, for obtaining battery
The corresponding table of the SOH pad value of packet and accumulative charging ampere-hour value.Attenuation coefficient determination unit, for being obtained by cycling life test
Take the attenuation coefficient of the battery charge capacity under different temperatures.Corrected Calculation unit, the cumulative charging for obtaining battery pack are pacified
When, and the cumulative charging ampere-hour of amendment is calculated according to the attenuation coefficient.Cycle life decay calculation unit, for according to institute
The cumulative charging ampere-hour of amendment and the corresponding table are stated, tables look-up to obtain cycle life SOH pad value.
Further, the system further include: second acquisition unit, for obtaining the calendar life capacity attenuation data of battery pack
Table, the tables of data embody the corresponding relationship of SOC value, battery temperature and SOH pad value.Calendar life decay calculation unit is used
The SOC value and battery temperature of battery pack when acquiring vehicle and standing, and calendar life SOH decaying is obtained according to the tables of data
Value.Service life SOH decay calculation unit is used for the sum of the cycle life SOH pad value and the calendar life SOH pad value
As service life of battery pack SOH pad value.
The attenuation coefficient determination unit includes: that charging capacity calculates unit, for detecting battery temperature when charging starting
Degree, and obtain the battery charge capacity after experience setting cycle-index at this temperature.Ratio calculation unit is used for the battery
Charging capacity and the ratio of primary battery charging capacity are as the corresponding attenuation coefficient of the battery temperature.
As it can be seen that the present invention provides the update the system of electric car SOH a kind of, by attenuation coefficient determination unit to battery pack
Cycling life test is carried out to obtain the attenuation coefficient of battery capacity, logical corrected Calculation unit repairs battery charging ampere-hour
Just, and then by cycle life decay calculation unit according to battery charging ampere-hour cycle life is obtained with the corresponding table of SOH pad value
SOH pad value.The SOH value estimation inaccuracy for solving the problems, such as existing electric car, can improve the safety that electric car uses
And intelligence.
Structure, feature and effect of the invention, the above institute is described in detail according to diagrammatically shown embodiment above
Only presently preferred embodiments of the present invention is stated, but the present invention does not limit the scope of implementation as shown in the drawings, it is all according to structure of the invention
Think made change or equivalent example modified to equivalent change, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of the present invention.
Claims (7)
1. a kind of modification method of electric car SOH characterized by comprising
The corresponding table of the SOH pad value of acquisition battery pack and accumulative charging ampere-hour value；
The attenuation coefficient of the battery charge capacity under different temperatures is obtained by cycling life test；
The cumulative charging ampere-hour of battery pack is obtained, and the cumulative charging ampere-hour of amendment is calculated according to the attenuation coefficient；
According to the cumulative charging ampere-hour of amendment and the corresponding table, table look-up to obtain cycle life SOH pad value.
2. the modification method of electric car SOH according to claim 1, which is characterized in that further include:
The calendar life capacity attenuation tables of data of battery pack is obtained, the tables of data embodies SOC value, battery temperature and SOH decaying
The corresponding relationship of value；
The SOC value and battery temperature of battery pack when vehicle is stood are acquired, and calendar life SOH decaying is obtained according to the tables of data
Value；
The sum of the cycle life SOH pad value and the calendar life SOH pad value are declined as service life of battery pack SOH
Depreciation.
3. the modification method of electric car SOH according to claim 2, which is characterized in that described to be tried by cycle life
Test the attenuation coefficient for obtaining the battery charge capacity under different temperatures, comprising:
Battery temperature when detection charging starting, and obtain the battery charge capacity after experience setting cycle-index at this temperature；
Using the battery charge capacity attenuation coefficient corresponding as the battery temperature with the ratio of primary battery charging capacity.
4. the modification method of electric car SOH according to claim 3, which is characterized in that described to be according to the decaying
The cumulative charging ampere-hour of amendment is calculated in number, comprising:
Using the cumulative charging ampere-hour and the product of the attenuation coefficient as the cumulative charging ampere-hour of the amendment.
5. a kind of update the system of electric car SOH characterized by comprising
First acquisition unit, for obtaining the corresponding table of the SOH pad value of battery pack with accumulative charging ampere-hour value；
Attenuation coefficient determination unit, for obtaining the decaying system of the battery charge capacity under different temperatures by cycling life test
Number；
For obtaining the cumulative charging ampere-hour of battery pack, and amendment is calculated according to the attenuation coefficient in corrected Calculation unit
Cumulative charging ampere-hour；
Cycle life decay calculation unit, for tabling look-up and being followed according to the cumulative charging ampere-hour of amendment and the corresponding table
Ring service life SOH pad value.
6. the update the system of electric car SOH according to claim 5, which is characterized in that further include:
Second acquisition unit, for obtaining the calendar life capacity attenuation tables of data of battery pack, the tables of data embody SOC value,
The corresponding relationship of battery temperature and SOH pad value；
Calendar life decay calculation unit, for acquiring the SOC value and battery temperature of battery pack when vehicle is stood, and according to described
Tables of data obtains calendar life SOH pad value；
Service life SOH decay calculation unit, for by the cycle life SOH pad value and the calendar life SOH pad value it
With as service life of battery pack SOH pad value.
7. the update the system of electric car SOH according to claim 6, which is characterized in that the attenuation coefficient determines single
Member includes:
Charging capacity calculates unit, for detecting battery temperature when charging starting, and obtains experience setting circulation at this temperature
Battery charge capacity after number；
Ratio calculation unit, for using the ratio of the battery charge capacity and primary battery charging capacity as the battery temperature pair
The attenuation coefficient answered.
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| CN110133535A (en) * | 2019-06-21 | 2019-08-16 | 阳光电源股份有限公司 | The SOH value of battery system determines method and device |
| CN110133535B (en) * | 2019-06-21 | 2022-04-08 | 阳光电源股份有限公司 | SOH value determination method and device of battery system |
| CN112363075A (en) * | 2019-11-21 | 2021-02-12 | 万向一二三股份公司 | Lithium ion battery aging evaluation method |
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| CN110927585A (en) * | 2019-12-31 | 2020-03-27 | 四川长虹电器股份有限公司 | Lithium battery SOH estimation system and method based on self-circulation correction |
| CN111596222A (en) * | 2020-04-23 | 2020-08-28 | 东软睿驰汽车技术（沈阳）有限公司 | Method and related device for obtaining state of health of vehicle battery |
| CN111596222B (en) * | 2020-04-23 | 2022-08-05 | 东软睿驰汽车技术（沈阳）有限公司 | Method and related device for obtaining state of health of vehicle battery |
| CN112946483A (en) * | 2021-02-05 | 2021-06-11 | 重庆长安新能源汽车科技有限公司 | Comprehensive evaluation method for battery health of electric vehicle and storage medium |
| CN113075557A (en) * | 2021-05-20 | 2021-07-06 | 张家港清研检测技术有限公司 | Vehicle owner self-adaptive power battery residual life prediction method |
| CN113721158A (en) * | 2021-07-19 | 2021-11-30 | 恒大海拉电子(扬州)有限公司 | Lithium ion battery life state estimation method based on temperature coupling model |
| CN115079029A (en) * | 2022-04-29 | 2022-09-20 | 中国第一汽车股份有限公司 | Power battery life equivalent estimation method and device |
| CN115476722A (en) * | 2022-10-10 | 2022-12-16 | 广汽埃安新能源汽车股份有限公司 | A battery management control method and device |
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