CN106546927A - A kind of electrokinetic cell SOH estimation on line methods based on temperature - Google Patents
A kind of electrokinetic cell SOH estimation on line methods based on temperature Download PDFInfo
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The present invention relates to power battery technology field, and in particular to a kind of electrokinetic cell SOH estimation on line methods based on temperature.The present invention provides a kind of electrokinetic cell SOH estimation on line methods based on temperature, and which includes the appraising model for setting up electrokinetic cell SOH, and the appraising model includes the only one-to-one correspondence when electrokinetic cell SOH and power battery charging between rate temperature change；Detect rate temperature change during power battery charging to be measured；Based on the appraising model, electrokinetic cell SOH to be measured is obtained using the rate temperature change for measuring.By the appraising model for setting up electrokinetic cell SOH, and the appraising model includes the only one-to-one correspondence when electrokinetic cell SOH and power battery charging between rate temperature change.The rate temperature change when evaluation method only needs to measure power battery charging to be measured, you can obtain electrokinetic cell SOH to be measured, measurement data is few, and measurement process is simple, and the evaluation method error is little and estimation precision is high.
Description
【Technical field】
The present invention relates to power battery technology field, and in particular to a kind of electrokinetic cell SOH estimation on line based on temperature
Method.
【Background technology】
As electrokinetic cell has the advantages that voltage is higher, energy density is larger, good cycle, therefore electrokinetic cell is produced
Industry quickly grows, and is used widely on electric automobile.In order to ensure that electrokinetic cell is capable of the work of highly effective and safe, need
Want an effective battery management system.Wherein with regard to electrokinetic cell SOH (Section Of Health, cell health state)
Research is the important topic in power battery technology field, can correctly predicted battery practical application of the health status to electrokinetic cell
There is very big help.
However, the aging of electrokinetic cell is an extremely complex chemical process, affect the factor of cell degradation very many.
Now for electrokinetic cell SOH estimation method it is the most frequently used be exactly testing impedance method.The method needs to test electrokinetic cell
AC impedance and DC impedance, testing procedure are more complicated, and can there is certain error, so that electrokinetic cell SOH estimations
Realize that difficult and accuracy is relatively low.
【The content of the invention】
For the technical problem for overcoming existing electrokinetic cell SOH estimations difficult, a kind of power based on temperature of present invention offer
Battery SOH estimation on line methods.
It is online that technical scheme to solve above-mentioned technical problem of the invention is to provide a kind of electrokinetic cell SOH based on temperature
Evaluation method, which includes the appraising model for setting up electrokinetic cell SOH, and the appraising model includes the electrokinetic cell SOH and moves
Only one-to-one correspondence when power battery charges between rate temperature change；Detect temperature change during power battery charging to be measured
Speed；Based on the appraising model, electrokinetic cell SOH to be measured is obtained using the rate temperature change for measuring.
Preferably, the appraising model includes the estimation equation SOH=f (VT) of electrokinetic cell SOH, and VT is filled for electrokinetic cell
Rate temperature change when electric.
Preferably, the appraising model for setting up electrokinetic cell SOH includes：Step S11：Nominal battery capacity is taken for CN's
Standard power battery is tested, the rate temperature change of standard electrokinetic cell and the current standard power when obtaining multigroup charging
Battery SOH；Step S12：The multigroup rate temperature change obtained using step S11 and corresponding standard power battery SOH, are used
Least square fitting obtains the estimation equation of the electrokinetic cell SOH.
Preferably, the estimation equation of the electrokinetic cell SOH is：SOH=a0+a1*VT+a2*VT^2+a3*VT^3+a4*VT^
4+a5* VT^5, wherein VT are rate temperature change when standard power battery charges, a0、a1、a2、a3、a4、a5It is with minimum
VT and corresponding SOH are fitted square law the constant for obtaining.
Preferably, the appraising model includes data base, and the data base includes some groups of electrokinetic cell SOH and power current
Rate temperature change one-to-one data when pond is charged.
Preferably, the appraising model for setting up electrokinetic cell SOH includes：Step S11：Nominal battery capacity is taken for CN's
Standard power battery is tested, the rate temperature change of standard electrokinetic cell and the current standard power when obtaining multigroup charging
Battery SOH；Step S12：The multigroup rate temperature change obtained using step S11 and corresponding standard power battery SOH, are set up
The data base.
Preferably, step S11 is further included：Step S111：Multiple cycle charge discharge is carried out to standard power battery
Electricity, charging current are running current；Step S112：The standard power battery for completing cycle charge-discharge is taken out, is carried out big
Electric current charges and regular picture, obtains current rate temperature change VT and standard power battery SOH；The large current charge is
The standard power battery is charged with 0.5-0.9 times of rated current；Step S113：Judge that step S112 is obtained current
Whether standard power battery SOH is less than 75%；If it is not, then repeat step S111, step S112；If so, then stop test.
Preferably, step S112 is further included：Step S1121：The standard power electricity of cycle charge-discharge will be completed
Pond is taken out and carries out large current charge, difference DELTA T between temperature and charging interval t1 before and after record standard power battery charging,
And rate temperature change VT is obtained, standing after the standard power battery completely fills makes the standard power battery be returned to room temperature；
Step S1122：Normal constant-current electric discharge, recording constant discharge current I and discharge time t2 are carried out to standard power battery, institute is obtained
State the current capacities CM of the standard power battery；The current capacities CM of the standard power battery and capacity C N of nominal battery it
Than being required drive battery SOH.
Preferably, in step S111, the number of times of cycle charge-discharge is 15-25 time.
Preferably, large current charge described in step S112 is to be charged with 0.8-0.9 times of rated current.
Relative to prior art, a kind of electrokinetic cell SOH estimation on line methods based on temperature provided by the present invention are led to
Cross the appraising model for setting up electrokinetic cell SOH, and the appraising model is when including the electrokinetic cell SOH with power battery charging
Only one-to-one correspondence between rate temperature change.Temperature when so the evaluation method only needs to measure power battery charging to be measured
Rate of change, you can obtain electrokinetic cell SOH to be measured, measurement data is few, and measurement process is simple, and the evaluation method error is little
And estimation precision is high.
【Description of the drawings】
Fig. 1 is schematic flow sheet of the present invention based on the electrokinetic cell SOH estimation on line methods of temperature.
Fig. 2 is the schematic flow sheet of step S1 in some preferred embodiments of the invention.
Fig. 3 is the schematic flow sheet of step S1 in alternate embodiment of the invention.
Fig. 4 is schematic flow sheet of the present invention based on step S11 in the electrokinetic cell SOH estimation on line methods of temperature.
Fig. 5 is schematic flow sheet of the present invention based on step S112 in the electrokinetic cell SOH estimation on line methods of temperature.
【Specific embodiment】
In order that the purpose of the present invention, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and embodiment,
The present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only to explain the present invention,
It is not intended to limit the present invention.
The invention provides a kind of electrokinetic cell SOH estimation on line methods based on temperature, as shown in figure 1, including following
Step：
Step S1：The appraising model of electrokinetic cell SOH is set up, the appraising model includes the electrokinetic cell SOH and moves
Only one-to-one correspondence when power battery charges between rate temperature change；
Step S2：Detect rate temperature change during power battery charging to be measured；
Step S3：Based on the appraising model, electrokinetic cell to be measured is obtained using the rate temperature change for measuring
SOH。
A kind of electrokinetic cell SOH estimation on line methods based on temperature provided by the present invention, by setting up electrokinetic cell
The appraising model of SOH, and the appraising model include when the electrokinetic cell SOH and power battery charging rate temperature change it
Between only one-to-one correspondence.Rate temperature change when so the evaluation method only needs to measure power battery charging to be measured, you can
Electrokinetic cell SOH to be measured is obtained, measurement data is few, measurement process is simple, and the evaluation method error is little and estimation precision is high.
In some preferred embodiments, the appraising model includes the estimation equation SOH=f (VT) of electrokinetic cell SOH,
Rate temperature change when VT is power battery charging.By setting up estimation equation, the rate temperature change surveyed can be utilized,
It is by being calculated the electrokinetic cell SOH, convenient and swift.See also Fig. 2, it is preferable that described to set up electrokinetic cell SOH
Appraising model the step of S1 include：
Step S11：Take the standard power battery that nominal battery capacity is CN to be tested, when obtaining multigroup charging, standard is moved
The rate temperature change of power battery and current standard power battery SOH；
Step S12：The multigroup rate temperature change obtained using step S11 and corresponding standard power battery SOH, are used
Least square fitting obtains the estimation equation of the electrokinetic cell SOH.
In general, the electrokinetic cell of each model is required for setting up an estimation equation, using method of least square
It is fitted, it is more simple and convenient and degree of accuracy is high, the appraising model of multiple electrokinetic cells can be fast and accurately set up, is effectively carried
The practicality of the high evaluation method.
When the data to being obtained are fitted acquisition estimation equation, it is preferable that the estimation equation is multinomial letter
Number.Polynomial function more meets the relation between the electrokinetic cell SOH and temperature of powered cell rate of change, estimates described
Calculate formula and be set to polynomial function, the degree of accuracy of the evaluation method can be effectively improved.Preferably, the estimation equation is：
SOH=a0+a1*VT+a2*VT^2+a3*VT^3+a4*VT^4+a5* VT^5,
Rate temperature change when wherein VT is the charging of standard power battery, a0、a1、a2、a3、a4、a5It is with a most young waiter in a wineshop or an inn
VT and corresponding SOH are fitted multiplication the constant for obtaining.
In general, in the polynomial function, the number of times of most high-order is higher, and its accuracy is better.In the present invention by true
The fixed polynomial function is five functions, can be reduced amount of calculation and improve while the accuracy of estimation equation obtained by guarantee
Work efficiency.
Specifically, rate temperature change VT1, VT2, VT3 ... of multigroup electrokinetic cell can be obtained in above-mentioned steps
VTn, and electrokinetic cell SOH1, SOH2, SOH3 ... SOHn.If multinomial is
F (VT)=a0+a1*VT+a2*VT^2+a3*VT^3+a4*VT^4+a5*VT^5
Then polynomial sum of square of deviations is
OrderJ=0,1,2,3,4,5
ThenJ=0,1,2,3,4,5
It is existing
(j=0,1,2,3,4, line equation group 5) can obtain aj, and (j=0,1,2,3,4, value 5), bring original into simultaneous aj
Electrokinetic cell SOH fitting output polynomial function f (VT)=SOH is successfully fitted in multinomial.
In other preferred embodiments, the appraising model includes data base, and the data base includes that some groups are moved
Power battery SOH and rate temperature change one-to-one data during power battery charging.By setting up data base, can direct root
The electrokinetic cell SOH corresponding to which is inquired about according to the rate temperature change for measuring.This mode is compared to fitting estimation equation
Mode, as which directly adopts truthful data, accuracy is higher, but to avoid the disappearance of intermediate data, needs test more
Many data, so in general need to take multiple standard power batteries being tested.
Incorporated by reference to shown in Fig. 1 and Fig. 3, in alternate embodiment, it is described set up electrokinetic cell SOH appraising model the step of S1
Including：
Step S11：Take the standard power battery that nominal battery capacity is CN to be tested, when obtaining multigroup charging, standard is moved
The rate temperature change of power battery and current standard power battery SOH；
Step S12：The multigroup rate temperature change obtained using step S11 and corresponding standard power battery SOH, are set up
The data base.
See also Fig. 4, it is preferable that step S11 is further included：
Step S111：Multiple cycle charge-discharge is carried out to standard power battery, charging current is running current.
By ensureing the electrokinetic cell surveyed in normal operating conditions, wherein it is preferred that circulating in step S111
The number of times of discharge and recharge is 15-25 time, optimum, and in step S111, the number of times of cycle charge-discharge is 20 times.Specifically, institute
State electrokinetic cell and be charged with the constant current of 0.5-1C, after electrokinetic cell electricity is full of, with the constant electricity of 0.05-0.1C
Stream is discharged.
Step S112：The standard power battery for completing cycle charge-discharge is taken out, large current charge and regular picture is carried out,
Obtain current rate temperature change VT and standard power battery SOH；The large current charge is with 0.5-0.9 times of rated current
It is charged；Further to improve testing efficiency, wherein it is preferred that the large current charge is with 0.8-0.9 times of specified electricity
Stream is charged.
See also Fig. 5, it is preferable that step S112 is further included：
Step S1121：The standard power battery for completing cycle charge-discharge is taken out carries out large current charge, and record standard is moved
Difference DELTA T between temperature and charging interval t1 before and after the charging of power battery, and rate temperature change VT is obtained, treat the standard
Electrokinetic cell is stood after completely filling makes the standard power battery be returned to room temperature；
Step S1122：Normal constant-current electric discharge, recording constant discharge current I and discharge time are carried out to standard power battery
T2, obtains the current capacities CM of the standard power battery；The current capacities CM and nominal battery of the standard power battery
Capacity C N ratio be required drive battery SO H.It can be appreciated that the current capacities CM=I*t2 of the standard power battery；Institute
State VT=Δ T/t1, the SOH=CM/CN.
Specifically, the large current charge is that electrokinetic cell is charged with the constant current of 1.5-3C.It is big after completely filling
Room temperature is returned to by about placing 10-20 minutes, then discharged with the constant current of 0.05-0.1C.Stand after completely filling dynamic
Power battery makes which be discharged after being returned to room temperature again, to guarantee to measure accurate electrokinetic cell current capacities.Ensure to obtain
Accurately electrokinetic cell SOH, further improves the accuracy of be fitted estimation equation.
Step S113：Judge whether the current power battery SOH that step S112 is obtained is less than 75%；If it is not, then repeatedly walking
Rapid S111, step S112；If so, then stop test.If that is, current power battery SOH >=75%, repeat step
S111, step S112；If current power battery SOH ＜ 75%, stop test.In general, when electrokinetic cell SOH is less than 75%
When, i.e., it is unusable.In other embodiments of the invention, naturally it is also possible to be less than 80% or 85% in electrokinetic cell SOH
When, stop test.
Carry out multiple cycle charge-discharge first to electrokinetic cell, and charging current is running current, it is ensured that power current
Pond is in normal operating conditions.Also, in electrokinetic cell after the multiple cycle charge-discharge, then carry out large current charge and
Regular picture, under large current charge state, the power battery charging speed is fast, and temperature change is more obvious, can measure more
Accurately data, that is, can guarantee that the accuracy for obtaining estimation equation, reduce error, improve the degree of accuracy of the evaluation method.
Compared with prior art, a kind of electrokinetic cell SOH estimation on line methods based on temperature provided by the present invention, its
Including the appraising model for setting up electrokinetic cell SOH, when the appraising model includes the electrokinetic cell SOH with power battery charging
Only one-to-one correspondence between rate temperature change；Detect rate temperature change during power battery charging to be measured；Based on institute
Appraising model is stated, and electrokinetic cell SOH is obtained using the rate temperature change for measuring.By setting up estimating for electrokinetic cell SOH
Model is calculated, and the appraising model is included when the electrokinetic cell SOH and power battery charging between rate temperature change only
One-to-one correspondence.So the evaluation method only needs to measure rate temperature change when battery charges, you can obtain electrokinetic cell
SOH, measurement data are few, and measurement process is simple, and the evaluation method error is little and estimation precision is high.
It is further that the appraising model includes the estimation equation SOH=f (VT) of electrokinetic cell SOH, and VT is power current
Rate temperature change when pond is charged.By setting up estimation equation, the rate temperature change surveyed can be utilized, by calculating
It is to the electrokinetic cell SOH, convenient and swift.
It is further that the appraising model for setting up electrokinetic cell SOH includes：Step S11：Taking nominal battery capacity is
The standard power battery of CN is tested, the rate temperature change of standard electrokinetic cell and the current standard when obtaining multigroup charging
Electrokinetic cell SOH；Step S12：The multigroup rate temperature change obtained using step S11 and corresponding standard power battery SOH,
The estimation equation of the electrokinetic cell SOH is obtained with least square fitting.It is fitted using method of least square, it is more simple
Folk prescription is just and degree of accuracy is high, can fast and accurately set up the appraising model of multiple electrokinetic cells, effectively improve the evaluation method
Practicality.
It is further that the estimation equation of the electrokinetic cell SOH is：SOH=a0+a1*VT+a2*VT^2+a3*VT^3+
a4*VT^4+a5* VT^5, wherein VT are rate temperature change when standard power battery charges, a0、a1、a2、a3、a4、a5It is utilization
VT and corresponding SOH are fitted method of least square the constant for obtaining.In the present invention by determining the polynomial function
For five functions, while the accuracy of estimation equation obtained by guarantee can reduce amount of calculation and improve work efficiency.
It is further that the appraising model includes data base, the data base includes some groups of electrokinetic cell SOH and moves
Rate temperature change one-to-one data when power battery charges.It is further, the estimation mould for setting up electrokinetic cell SOH
Type includes：Step S11：Take the standard power battery that nominal battery capacity is CN to be tested, when obtaining multigroup charging, standard is moved
The rate temperature change of power battery and current standard power battery SOH；Step S12：The multigroup temperature obtained using step S11
Rate of change and corresponding standard power battery SOH, set up the data base.By setting up data base, can be directly according to survey
The rate temperature change for obtaining inquires about the electrokinetic cell SOH corresponding to which.Side of this mode compared to fitting estimation equation
Formula, as which directly adopts truthful data, accuracy is higher.
It is further that step S11 is further included：Step S111：Standard power battery is repeatedly circulated
Discharge and recharge, charging current are running current；Step S112：The standard power battery for completing cycle charge-discharge is taken out, is entered
Row large current charge and regular picture, obtain current rate temperature change VT and standard power battery SOH；The high current is filled
Electricity is the standard power battery to be charged with 0.5-0.9 times of rated current；Step S113：Judge what step S112 was obtained
Whether Current standards electrokinetic cell SOH is less than 75%；If it is not, then repeat step S111, step S112；If so, then stop test.
Carry out multiple cycle charge-discharge first to electrokinetic cell, and charging current is running current, it is ensured that electrokinetic cell is in just
Normal working condition.Also, in electrokinetic cell after the multiple cycle charge-discharge, then carry out large current charge and normally put
Electricity, under large current charge state, the power battery charging speed is fast, and temperature change is more obvious, can measure more accurately
Data, that is, can guarantee that the accuracy for obtaining estimation equation, reduce error, improve the degree of accuracy of the evaluation method.
It is further that step S112 is further included：Step S1121：The standard for completing cycle charge-discharge is moved
Power battery takes out and carries out large current charge, when difference DELTA T between temperature before and after record standard power battery charging and charging
Between t1, and obtain rate temperature change VT, standing after the standard power battery completely fills is returned to the standard power battery
Room temperature；Step S1122：Normal constant-current electric discharge, recording constant discharge current I and discharge time t2 are carried out to standard power battery,
The current capacities CM of the standard power battery described in obtaining；The current capacities CM of the standard power battery and the appearance of nominal battery
The ratio of amount CN is required drive battery SOH.Electrokinetic cell is stood after completely filling to be made which be returned to room temperature to be discharged again, to guarantee
Measure accurate electrokinetic cell current capacities.Ensure to obtain accurate electrokinetic cell SOH, further improve be fitted estimation
The accuracy of formula.
It is further that, by ensureing the electrokinetic cell surveyed in normal operating conditions, circulation in step S111 is filled
The number of times of electric discharge is 15-25 time.Optimum, in step S111, the number of times of cycle charge-discharge is 20 times.
It is further that large current charge described in step S112 is to be charged with 0.8-0.9 times of rated current,
Testing efficiency can further be improved.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all originals in the present invention
Any modification made within then, equivalent and improvement etc. all should be comprising within protection scope of the present invention.
Claims (10)
1. a kind of electrokinetic cell SOH estimation on line methods based on temperature, it is characterised in that：Which includes setting up electrokinetic cell SOH
Appraising model, the appraising model includes when the electrokinetic cell SOH and power battery charging between rate temperature change
Only one-to-one correspondence；Detect rate temperature change during power battery charging to be measured；Based on the appraising model, using measuring
The rate temperature change obtain electrokinetic cell SOH.
2. electrokinetic cell SOH estimation on line methods as described in the appended claim 1 based on temperature, it is characterised in that：The estimation
Model includes the estimation equation SOH=f (VT) of electrokinetic cell SOH, rate temperature change when VT is power battery charging.
3. electrokinetic cell SOH estimation on line methods as stated in claim 2 based on temperature, it is characterised in that：The foundation
The appraising model of electrokinetic cell SOH includes：Step S11：Take the standard power battery that nominal battery capacity is CN to be tested, obtain
The rate temperature change of standard electrokinetic cell and the current standard power battery SOH when taking multigroup charging；Step S12：Using step
Multigroup rate temperature change and corresponding standard power battery SOH that rapid S11 is obtained, obtain described with least square fitting
The estimation equation of electrokinetic cell SOH.
4. electrokinetic cell SOH estimation on line methods as claimed in claim 3 based on temperature, it is characterised in that：The power
The estimation equation of battery SOH is：SOH=a0+a1*VT+a2*VT^2+a3*VT^3+a4*VT^4+a5* VT^5, wherein VT are standard
Rate temperature change during power battery charging, a0、a1、a2、a3、a4、a5It is VT and corresponding SOH to be entered with method of least square
The constant that row fitting is obtained.
5. electrokinetic cell SOH estimation on line methods as described in the appended claim 1 based on temperature, it is characterised in that：The estimation
Model includes data base, and the data base includes some groups of electrokinetic cell SOH with rate temperature change one during power battery charging
One corresponding data.
6. electrokinetic cell SOH estimation on line methods as claimed in claim 5 based on temperature, it is characterised in that：The foundation
The appraising model of electrokinetic cell SOH includes：Step S11：Take the standard power battery that nominal battery capacity is CN to be tested, obtain
The rate temperature change of standard electrokinetic cell and the current standard power battery SOH when taking multigroup charging；Step S12：Using step
Multigroup rate temperature change and corresponding standard power battery SOH that rapid S11 is obtained, set up the data base.
7. such as the electrokinetic cell SOH estimation on line methods described in claim 3 or 6 based on temperature, it is characterised in that：The step
Rapid S11 is further included：
Step S111：Multiple cycle charge-discharge is carried out to standard power battery, charging current is running current；
Step S112：The standard power battery for completing cycle charge-discharge is taken out, large current charge and regular picture is carried out, is obtained
Current rate temperature change VT and standard power battery SOH；The large current charge is to institute with 0.5-0.9 times of rated current
State standard power battery to be charged；
Step S113：Judge whether the Current standards electrokinetic cell SOH that step S112 is obtained is less than 75%；If it is not, then repeatedly walking
Rapid S111, step S112；If so, then stop test.
8. electrokinetic cell SOH estimation on line methods as recited in claim 7 based on temperature, it is characterised in that：The step
S112 is further included：
Step S1121：The standard power battery for completing cycle charge-discharge is taken out carries out large current charge, record standard power current
Difference DELTA T between temperature and charging interval t1 before and after the charging of pond, and rate temperature change VT is obtained, treat the standard power
Battery is stood after completely filling makes the standard power battery be returned to room temperature；
Step S1122：Normal constant-current electric discharge, recording constant discharge current I and discharge time t2 are carried out to standard power battery, is obtained
Obtain the current capacities CM of the standard power battery；The current capacities CM of the standard power battery and the capacity of nominal battery
The ratio of CN is required drive battery SOH.
9. electrokinetic cell SOH estimation on line methods as recited in claim 7 based on temperature, it is characterised in that：The step
In S111, the number of times of cycle charge-discharge is 15-25 time.
10. electrokinetic cell SOH estimation on line methods as recited in claim 7 based on temperature, it is characterised in that：The step
Large current charge described in S112 is to be charged with 0.8-0.9 times of rated current.
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| CN108037462A (en) * | 2017-12-14 | 2018-05-15 | 株洲广锐电气科技有限公司 | Storage battery health status quantization method and system |
| CN108107372A (en) * | 2017-12-14 | 2018-06-01 | 株洲广锐电气科技有限公司 | Accumulator health status quantization method and system based on the estimation of SOC subregions |
| CN108398647A (en) * | 2018-03-01 | 2018-08-14 | 杭州高特新能源技术有限公司 | Lithium battery difference charging and discharging curve acquisition methods |
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| CN110554325B (en) * | 2019-09-10 | 2020-11-10 | 北京理工大学 | Surface temperature-based capacity estimation method for vehicle lithium ion battery |
| CN111537890A (en) * | 2020-05-11 | 2020-08-14 | 浙江衡睿科技有限公司 | Battery SOH estimation method |
| CN112946484A (en) * | 2021-02-07 | 2021-06-11 | 中南大学 | SOC estimation method and system based on BP neural network, terminal equipment and readable storage medium |
| CN112946484B (en) * | 2021-02-07 | 2022-12-23 | 中南大学 | SOC estimation method, system, terminal equipment and readable storage medium based on BP neural network |
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