CN109800446A - A kind of lithium ion battery discharge process voltage inconsistency estimation method and device - Google Patents
A kind of lithium ion battery discharge process voltage inconsistency estimation method and device Download PDFInfo
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- CN109800446A CN109800446A CN201811480916.6A CN201811480916A CN109800446A CN 109800446 A CN109800446 A CN 109800446A CN 201811480916 A CN201811480916 A CN 201811480916A CN 109800446 A CN109800446 A CN 109800446A
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Abstract
The present invention provides a kind of lithium ion battery discharge process voltage inconsistency estimation method and device, method include: obtain battery group before cell discharge voltage with volume change probability distribution cloud atlas；First derivative and second dervative about voltage to capacity is sought to probability distribution cloud atlas；According to the discreteness and symmetry of first derivative and second dervative acquisition monomer battery voltage distribution with the changing rule of discharge process.The present invention not only can be with estimated voltage symmetry change procedure with estimated voltage discreteness change procedure, estimated result can effectively instruct the foundation of battery state algorithm for estimating, guarantee that each single battery is in monitoring range in battery pack, avoids monitoring dead angle.The present invention obtains voltage about capacity first derivative and second dervative using the method for Numerical Value Derivative, directly obtains voltage dispersion and symmetry, to effectively realize the efficient prediction of discharge voltage inconsistency instead of complicated statistical method.
Description
Technical field
The present invention relates to technical field of lithium ion, and in particular to a kind of lithium ion battery discharge process voltage is inconsistent
Property estimation method and device.
Background technique
To meet the high-power automobile-used demand of high-energy, lithium ion battery needs the use that can just get on the bus in groups in series and parallel.So
And due to the difference of performance between single battery, making battery performance, this not only will affect the detection of BMS lower than single battery
Precision can also make the pond group lost of life or safety problem occurs.Single battery in groups after problem of inconsistency it is inevitable, only
It can aggravate with cyclic process.The most important performance of inconsistency is the inconsistency of voltage and capacity between monomer in battery pack,
This accuracy that will be directly influenced BMS system battery status is estimated；Also the service load of different batteries can be made different, directly
Influence the inconsistency of battery life.Therefore, evolution process and its behind of cell voltage inconsistency rule are fully understood
Reason is to alleviate battery pack problem of inconsistency and the estimation of the battery state as caused by inconsistency and life prediction problem
Key.
SOC, SOH method for estimating state of current battery group are all to choose the minimum and maximum battery of capacity as foundation,
Directly battery pack estimation model is converted by single battery state estimation model.Such mode can accurately be estimated in a short time
Battery status, but the actual condition information of each battery can not be captured, the future state of each battery can not also be done
It predicts out.
It is completely dependent on the mathematical method of data-driven, can guarantee the precision of battery simulation result using initial stage in battery,
But after this method needs to carry out sufficient data study to studied battery pack, it could predict the remaining life of the battery,
Institute's learning parameter can not be extended to other batteries, i.e. method does not have universality.This ignored inconsistency information will
A kind of uncontrollable factor can be become, so that battery pack inconsistency evolution path in following work is deviateed expected value, therewith
Original method for estimating state precision also will be no longer applicable in.But practical BMS to the monitoring of battery pack be reduce calculation amount and only
Two minimum and maximum batteries of selection concern capacity, therefore will be unable to obtain the details of battery parameter inconsistency.
In actual production and battery group stage, the inconsistent of battery is reduced by the screening to battery capacity and internal resistance
Property, the difference after can reducing to a certain extent in groups between single battery.The selection of this kind of parameter can only guarantee that battery is quiet
State parameter it is consistent, and cannot be guaranteed the consistent of charge and discharge process, i.e. the inconsistency of voltage.However, to the inconsistent of voltage
Although property can be alleviated by the balance module of BMS, cannot be completely eliminated, and with the decaying of battery performance, battery
Between inconsistency can gradually aggravate.Therefore, for the solution of the problem of inconsistency of battery, not only need maximum can
Energy ground excludes, it is also necessary to accurately monitor and predict.
Currently, the research of the problem of inconsistency of the state monitoring method or stack battery of either battery pack, is all
Relatively independent.Battery problem of inconsistency caused by production process can be alleviated by screening technique to a certain extent, but
It is that comprehensive cognition is still lacked to the problem of inconsistency of rear battery in groups.This will affect the long-term detection accuracy of battery pack and
Operating conditions make Individual cells become monitoring dead angle in battery pack, can not work under normal operating condition, cause accelerated ageing
Or safety problem.
Summary of the invention
For the problems of the prior art, the present invention provides a kind of lithium ion battery discharge process voltage inconsistency estimation
Method and device.
Specifically, the present invention the following technical schemes are provided:
In a first aspect, the present invention provides a kind of lithium ion battery discharge process voltage inconsistency estimation methods, comprising:
Obtain battery group before cell discharge voltage with volume change probability distribution cloud atlas；
First derivative and second dervative about voltage to capacity is sought to the probability distribution cloud atlas；
Battery voltage discreteness is obtained with the changing rule of electric discharge, and according to the second order according to the first derivative
Derivative obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
Further, the method also includes:
It is for statistical analysis with three parameter Weibull probabilistic models to the probability distribution cloud atlas, obtain three parameters with
The variation tendency of battery discharge procedure, and battery voltage is obtained with the variation tendency of battery discharge procedure according to three parameters
Discreteness with electric discharge changing rule and symmetry with electric discharge changing rule；
It is obtained with the changing rule of electric discharge to according to the first derivative using the different monomers cell voltage discreteness of acquisition
The different monomers cell voltage discreteness taken is verified with the changing rule of electric discharge, judges described to be obtained according to the first derivative
The different monomers cell voltage discreteness taken with electric discharge changing rule whether with according to three parameters with battery discharge procedure
The different monomers cell voltage discreteness that variation tendency obtains is consistent or similar with the changing rule of electric discharge；
And it is led with the changing rule of electric discharge to according to the second order using the different monomers cell voltage symmetry of acquisition
The different monomers cell voltage symmetry that number obtains are verified with the changing rule of electric discharge, judge described to be led according to the second order
Number obtain different monomers cell voltage symmetry with electric discharge changing rule whether with according to three parameters with battery discharge mistake
The different monomers cell voltage symmetry that the variation tendency of journey obtains is consistent or similar with the changing rule of electric discharge.
Further, the method also includes:
If according to the different monomers cell voltage discreteness of first derivative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness with electric discharge changing rule
It is consistent or similar, then battery voltage discreteness is obtained with the changing rule of electric discharge, otherwise, according to three according to the first derivative
A parameter judges whether there is the factor of the other influences voltage inconsistency in addition to capacity with the variation tendency of battery discharge procedure；
If according to the different monomers cell voltage symmetry of second dervative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage symmetry with electric discharge changing rule
It is consistent or similar, then according to second dervative acquisition different monomers cell voltage symmetry with the changing rule of electric discharge, otherwise,
The other influences voltage inconsistency in addition to capacity is judged whether there is with the variation tendency of battery discharge procedure according to three parameters
Factor.
Further, the method also includes:
If according to the different monomers cell voltage discreteness of first derivative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness with electric discharge changing rule
It is consistent or similar in specified discharge time section, then in the specified discharge time section, battery pack is obtained according to the first derivative
Voltage dispersion with electric discharge changing rule, in non-specified discharge time section, according to three parameters with battery discharge procedure
Variation tendency judge the factor that whether there is other influences voltage inconsistency in addition to capacity；
If according to the different monomers cell voltage symmetry of second dervative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage symmetry with electric discharge changing rule
It is consistent or similar in specified discharge time section, then in the specified discharge time section, different lists are obtained according to the second dervative
Body cell voltage symmetry is put according to three parameters with battery with the changing rule of electric discharge in the non-specified discharge time section
The variation tendency of electric process obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
Second aspect, the present invention also provides a kind of lithium ion battery discharge process voltage inconsistency estimation device, packets
It includes:
Module is obtained, for obtaining before battery group cell discharge voltage with the probability distribution cloud atlas of volume change；
Computing module, for seeking leading about first derivative and second order of the voltage to capacity to the probability distribution cloud atlas
Number；
First estimation module is advised for obtaining battery voltage discreteness according to the first derivative with the variation of electric discharge
Rule, and different monomers cell voltage symmetry is obtained with the changing rule of electric discharge according to the second dervative.
Further, described device further include:
Second estimation module, for for statistical analysis with Weibull probabilistic model to the probability distribution cloud atlas, acquisition
Three parameters with battery discharge procedure variation tendency, and according to three parameters with battery discharge procedure variation tendency obtain
Battery voltage discreteness with electric discharge changing rule and symmetry with electric discharge changing rule；
Authentication module, for the different monomers cell voltage discreteness using acquisition with the changing rule of electric discharge to according to institute
The different monomers cell voltage discreteness for stating first derivative acquisition is verified with the changing rule of electric discharge, is judged described according to institute
State first derivative acquisition different monomers cell voltage discreteness with electric discharge changing rule whether with according to three parameters with electricity
The different monomers cell voltage discreteness that the variation tendency of tank discharge process obtains is consistent or similar with the changing rule of electric discharge；
And it is led with the changing rule of electric discharge to according to the second order using the different monomers cell voltage symmetry of acquisition
The different monomers cell voltage symmetry that number obtains are verified with the changing rule of electric discharge, judge described to be led according to the second order
Number obtain different monomers cell voltage symmetry with electric discharge changing rule whether with according to three parameters with battery discharge mistake
The different monomers cell voltage symmetry that the variation tendency of journey obtains is consistent or similar with the changing rule of electric discharge.
Further, described device further include:
First choice module, if the different monomers cell voltage discreteness for being obtained according to the first derivative is with electric discharge
Changing rule with according to three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness
It is consistent or similar with the changing rule of electric discharge, then according to the first derivative, otherwise, according to three parameters with battery discharge procedure
Variation tendency；
If according to the different monomers cell voltage symmetry of second dervative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage symmetry with electric discharge changing rule
It is consistent or similar, then according to second dervative acquisition different monomers cell voltage symmetry with the changing rule of electric discharge, otherwise,
The other influences voltage inconsistency in addition to capacity is judged whether there is with the variation tendency of battery discharge procedure according to three parameters
Factor.
Further, described device further include:
Second selecting module, if the different monomers cell voltage discreteness for being obtained according to the first derivative is with electric discharge
Changing rule with according to three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness
It is consistent or similar in specified discharge time section with the changing rule of electric discharge, then in the specified discharge time section, according to described one
Order derivative judges the factor that whether there is other influences voltage inconsistency in addition to capacity, in non-specified discharge time section,
Judged to whether there is other influences voltage inconsistency in addition to capacity with the variation tendency of battery discharge procedure according to three parameters
Factor；
If according to the different monomers cell voltage symmetry of second dervative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage symmetry with electric discharge changing rule
It is consistent or similar in specified discharge time section, then in the specified discharge time section, different lists are obtained according to the second dervative
Body cell voltage symmetry is put according to three parameters with battery with the changing rule of electric discharge in the non-specified discharge time section
The variation tendency of electric process obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
The third aspect, the present invention also provides a kind of electronic equipment, including memory, processor and storage are on a memory
And the computer program that can be run on a processor, the processor realized when executing described program as described in relation to the first aspect lithium from
The step of sub- battery discharge procedure voltage inconsistency estimation method.
Fourth aspect, the present invention also provides a kind of computer readable storage mediums, are stored thereon with computer program, should
Realize that lithium ion battery discharge process voltage inconsistency is estimated as described in relation to the first aspect when computer program is executed by processor
The step of method.
By prior art scheme it is found that lithium ion battery discharge process voltage inconsistency provided by the invention estimation side
Method, comprising: obtain battery group before cell discharge voltage with volume change probability distribution cloud atlas；To the probability distribution cloud atlas
Seek the first derivative and second dervative about voltage to capacity；According to the first derivative obtain different monomers cell voltage from
Property is dissipated with the changing rule of electric discharge, and different monomers cell voltage symmetry is obtained with the change of electric discharge according to the second dervative
Law.The present invention, not only can be with the discreteness change procedure of estimated voltage compared with traditional inconsistency estimation method.Also
Electricity can be effectively instructed using estimated result as one of battery performance index with the symmetry change procedure of estimated voltage
The foundation of pond group state estimation algorithm guarantees that each single battery is in monitoring range in battery pack, avoids monitoring dead angle.This
Outside, the present invention obtains voltage about capacity first derivative and second dervative using the method for Numerical Value Derivative, and then directly obtains electricity
Press discreteness and symmetry, thus effectively instead of complicated statistical procedures method, reduce as a result, battery cost of sampling and
Test period realizes the efficient prediction of discharge voltage inconsistency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the process for the lithium ion battery discharge process voltage inconsistency estimation method that one embodiment of the invention provides
Figure；
Fig. 2 is the artificial battery voltage probability distribution cloud atlas that one embodiment of the invention provides；
Fig. 3 is the artificial battery voltage probability distribution cloud atlas (X-Y axonometric drawing) that one embodiment of the invention provides；
Fig. 4 is the artificial battery voltage probability distribution cloud atlas (X-Z axonometric drawing) that one embodiment of the invention provides；
Fig. 5 is the Weibull probabilistic model parameter curve that one embodiment of the invention provides；
Fig. 6 is the Numerical Value Derivative a ' and statistical estimate a that one embodiment of the invention providesWeibullCurve comparison schematic diagram；
Fig. 7 is the Numerical Value Derivative b ' and statistical estimate b that one embodiment of the invention providesWeibullCurve comparison schematic diagram；
Fig. 8 be another embodiment of the present invention provides lithium ion battery discharge process voltage inconsistency estimation device knot
Structure schematic diagram；
Fig. 9 is the structural schematic diagram for the electronic equipment that further embodiment of this invention provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 shows the lithium ion battery discharge process voltage inconsistency estimation method of one embodiment of the invention offer
Flow chart.As shown in Figure 1, lithium ion battery discharge process voltage inconsistency estimation method provided in this embodiment, comprising:
Step 101: obtain battery group before cell discharge voltage with volume change probability distribution cloud atlas.
Step 102: the first derivative and second dervative about voltage to capacity are sought to the probability distribution cloud atlas.
Step 103: battery voltage discreteness is obtained with the changing rule of electric discharge according to the first derivative, and according to
The second dervative obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
The method that the present embodiment uses Numerical Value Derivative dissects the reason of voltage inconsistency variation tendency is formed, due to electricity
Press discreteness and discharge voltage highly relevant to the first derivative of capacity, the second order of the symmetry of voltage and discharge voltage to capacity
Derivative is related.Therefore, the present embodiment makes full use of this feature, becomes to the discharge voltage inconsistency as caused by capacity inconsistency
Change process is directly by obtaining voltage capacity curve derivation, to realize the changing rule to battery discharge procedure voltage's distribiuting
Prediction.
By prior art scheme it is found that lithium ion battery discharge process voltage inconsistency provided in this embodiment estimation side
Method, comprising: obtain battery group before cell discharge voltage with volume change probability distribution cloud atlas；To the probability distribution cloud atlas
Seek the first derivative and second dervative about voltage to capacity；According to the first derivative obtain battery voltage discreteness with
The changing rule of electric discharge, and different monomers cell voltage symmetry is obtained according to the second dervative and is advised with the variation of electric discharge
Rule.The present embodiment not only can may be used also compared with traditional inconsistency estimation method with the discreteness change procedure of estimated voltage
Battery can be effectively instructed using estimated result as one of battery performance index with the symmetry change procedure of estimated voltage
The foundation of group state estimation algorithm guarantees that each single battery is in monitoring range in battery pack, avoids monitoring dead angle.This
Outside, the present embodiment obtains voltage about capacity first derivative and second dervative using the method for Numerical Value Derivative, and then directly obtains
Voltage dispersion and symmetry, to effectively reduce battery cost of sampling as a result, instead of complicated statistical procedures method
And test period, realize the quick predict of discharge voltage inconsistency.
Content based on the above embodiment, in a kind of optional embodiment, the method also includes:
It is for statistical analysis with Weibull probabilistic model to the probability distribution cloud atlas, it obtains three parameters and is put with battery
The variation tendency of electric process, and battery voltage discreteness is obtained with the variation tendency of battery discharge procedure according to three parameters
With electric discharge changing rule and symmetry with electric discharge changing rule；
It is obtained with the changing rule of electric discharge to according to the first derivative using the different monomers cell voltage discreteness of acquisition
The different monomers cell voltage discreteness taken is verified with the changing rule of electric discharge, judges described to be obtained according to the first derivative
The different monomers cell voltage discreteness taken with electric discharge changing rule whether with according to three parameters with battery discharge procedure
The different monomers cell voltage discreteness that variation tendency obtains is consistent or similar with the changing rule of electric discharge；
And it is led with the changing rule of electric discharge to according to the second order using the different monomers cell voltage symmetry of acquisition
The different monomers cell voltage symmetry that number obtains are verified with the changing rule of electric discharge, judge described to be led according to the second order
Number obtain different monomers cell voltage symmetry with electric discharge changing rule whether with according to three parameters with battery discharge mistake
The different monomers cell voltage symmetry that the variation tendency of journey obtains is consistent or similar with the changing rule of electric discharge.
In the present embodiment, in order to improve cognition of the battery pack detection algorithm to problem of inconsistency, guarantee battery pack
Meet the working environment for possessing health of each battery while state estimation and the long-term accuracy of life prediction algorithm as far as possible,
It is for statistical analysis to preceding battery discharge behavior in groups, by three parameter Weibull statistical methods to cell voltage inconsistency
Reliable description is made that with the changing rule of discharge process, and the discreteness and symmetry that can clearly know voltage are with electric discharge
Change procedure, and the processing mode can not only be become compared with traditional inconsistency estimation method with the discreteness of estimated voltage
Change process, can be with the symmetry change procedure of estimated voltage.Using statistical result as one of battery performance index, Ke Yiyou
Effect instructs the foundation of battery state algorithm for estimating, guarantees that each single battery avoids supervising in monitoring range in battery pack
Survey dead angle.
Further, since the description result reliability that three parameter Weibull statistical methods obtain is higher, therefore will be according to three ginsengs
The different monomers cell voltage discreteness that the description result that number Weibull statistical method obtains is obtained according to first derivative is with electric discharge
Changing rule and according to second dervative obtain different monomers cell voltage symmetry verified with the changing rule of electric discharge,
To confirm the different monomers cell voltage discreteness obtained according to first derivative with the changing rule of electric discharge and according to second dervative
Whether the different monomers cell voltage symmetry of acquisition is rationally or effective with the changing rule of electric discharge.
Content based on the above embodiment, in a kind of optional embodiment, the method also includes:
If according to the different monomers cell voltage discreteness of first derivative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness with electric discharge changing rule
It is consistent or similar, then battery voltage discreteness is obtained with the changing rule of electric discharge, otherwise, according to three according to the first derivative
A parameter judges whether there is the factor of the other influences voltage inconsistency in addition to capacity with the variation tendency of battery discharge procedure；
If according to the different monomers cell voltage symmetry of second dervative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage symmetry with electric discharge changing rule
It is consistent or similar, then according to second dervative acquisition different monomers cell voltage symmetry with the changing rule of electric discharge, otherwise,
The other influences voltage inconsistency in addition to capacity is judged whether there is with the variation tendency of battery discharge procedure according to three parameters
Factor.
In the present embodiment, if the different monomers cell voltage discreteness obtained according to the first derivative is with electric discharge
Changing rule with according to three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness with
The changing rule of electric discharge is consistent or similar, then illustrate the different monomers cell voltage discreteness obtained according to the first derivative with
The changing rule of electric discharge is rationally or effective, and because obtaining battery voltage discreteness with the change of electric discharge according to the first derivative
The fairly simple convenience of law, can reduce battery cost of sampling and test period, therefore can be obtained according to the first derivative
Take battery voltage discreteness with the changing rule of electric discharge, otherwise, to guarantee the accuracy of estimated result and the property of can refer to, preferably
Battery voltage discreteness is obtained with the variation tendency of battery discharge procedure according to three parameters to judge with the changing rule of electric discharge
It whether there is the factor of other influences voltage inconsistency in addition to capacity.In addition, being advised for voltage symmetry with the variation of electric discharge
Similarly, details are not described herein again for the estimation mode of rule.
Content based on the above embodiment, in a kind of optional embodiment, the method also includes:
If according to the different monomers cell voltage discreteness of first derivative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness with electric discharge changing rule
It is consistent or similar in specified discharge time section, then in the specified discharge time section, battery pack is obtained according to the first derivative
Voltage dispersion with electric discharge changing rule, in non-specified discharge time section, according to three parameters with battery discharge procedure
Variation tendency judge the factor that whether there is other influences voltage inconsistency in addition to capacity；
If according to the different monomers cell voltage symmetry of second dervative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage symmetry with electric discharge changing rule
It is consistent or similar in specified discharge time section, then in the specified discharge time section, different lists are obtained according to the second dervative
Body cell voltage symmetry is put according to three parameters with battery with the changing rule of electric discharge in the non-specified discharge time section
The variation tendency of electric process obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
In the present embodiment, if the different monomers cell voltage discreteness obtained according to the first derivative is with electric discharge
Changing rule with according to three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness with
The changing rule of electric discharge is not quite identical or similar, but consistent or similar in specified discharge time section (such as the electric discharge later period)
(consistent or similar finger similarity here is greater than preset standard, and if 80%) similarity is more than or equal to, then explanation is described specified
The different monomers cell voltage discreteness obtained in discharge time section according to the first derivative is reasonable with the changing rule of electric discharge
Or effectively, and because obtaining different monomers cell voltage discreteness according to the first derivative it is removed with the changing rule judgement of electric discharge
The fairly simple convenience of factor that whether there is other influences voltage inconsistency outside capacity, can reduce battery cost of sampling and survey
It tries the period, therefore different monomers electricity can be obtained according to the first derivative in the specified discharge time section (such as the electric discharge later period)
Cell voltage discreteness with electric discharge changing rule, and in non-specified discharge time section, according to three parameters with battery discharge
The variation tendency of process obtains different monomers cell voltage discreteness and judges to whether there is in addition to capacity with the changing rule of electric discharge
The factor of other influences voltage inconsistency, to guarantee the accuracy of the estimated result in the non-specified discharge time section
With the property of can refer to.In addition, for voltage symmetry with the changing rule of electric discharge estimation mode similarly, details are not described herein again.
Below in conjunction with attached drawing and principle to battery discharge procedure voltage inconsistency estimation method provided in this embodiment
It is described in detail.
Step 1: the probability distribution of voltage curve.The probability distribution of the discharge voltage of 100 batteries is become with discharge capacity
Change is made into 4 dimension images, and as in Figure 2-4, four dimensions are respectively as follows: x-axis: discharge capacity；Y-axis normalized voltage；Z-axis: voltage；
Color axis: distribution probability.
Step 2: the statistical analysis of voltage inconsistency.
Weibull probabilistic model probability density function (PDF) is as shown in following formula one:
Above-mentioned function is determined by three parameters, wherein a is dimensional parameters, and b is form parameter, and c is location parameter；
Three parameter Weibull statistical analysis is done to the discharge voltage profile of 100 batteries, obtains three parameters with discharging
The variation tendency of journey is as shown in Figure 5.
Step 3: the numerical value of voltage inconsistency derives
According to two V=V of formula (SOC) voltage-capacity curve and formula threeThe relationship of capacity and SOC
Derive battery inconsistency Behavioral change rule.First derivative and second order about capacity is asked to lead voltage-capacity curve respectively
Number, obtains causing the discreteness of voltage and the changing rule of symmetry by capacity.Wherein, C indicates battery discharge electricity, CtIt indicates
Battery capacity, SOC indicate battery charge state；SOC(Ct, C) and indicate that battery charge state is the function of capacity and discharge electricity amount.
The relationship such as following formula of cell voltage discreteness and capacity discreteness:
The relationship of cell voltage symmetry and discharge capacity such as following formula:
Set formula four and formula five respectively as a ' and b ', the calculated result and statistical result for thus obtaining formula four and formula five compare,
As shown in Figure 6, Figure 7.
A ' the value and b ' value obtain to the Numerical Value Derivative of voltage curve is for analyzing voltage curve discreteness and concavity and convexity pair
The influence of voltage's distribiuting.Wherein, calculated result shows preferable similar to a value of Weibull probabilistic model and b value trend
Property, a ' value and aWeibullIt is consistent to be worth height in curvilinear trend, electric discharge later period numerical value is also identical, and therefore, a ' can be used for discharging
The discreteness of later period voltage dispersion is predicted.B ' and bWeibullIt is also quite similar in trend, but tied since two methods calculate
There are the differences of the order of magnitude for fruit itself, directly directly can not speculate b by b ' valueWeibullNumerical value, therefore b ' value can be passed through
The concavity and convexity of symbol decision function, to bWeibullDo qualitative supposition.
Fig. 8 shows the knot of the lithium ion battery discharge process voltage inconsistency estimation device of another embodiment of the present invention
Structure schematic diagram.As shown in figure 8, lithium ion battery discharge process voltage inconsistency estimation device provided in this embodiment includes:
Obtain module 21, computing module 22 and the first estimation module 23, in which:
Module 21 is obtained, for obtaining before battery group cell discharge voltage with the probability distribution cloud atlas of volume change；
Computing module 22, for seeking leading about first derivative and second order of the voltage to capacity to the probability distribution cloud atlas
Number；
First estimation module 23 is advised for obtaining battery voltage discreteness according to the first derivative with the variation of electric discharge
Rule, and different monomers cell voltage symmetry is obtained with the changing rule of electric discharge according to the second dervative.
Content based on the above embodiment, in a kind of optional embodiment, described device further include:
Second estimation module, for for statistical analysis with Weibull probabilistic model to the probability distribution cloud atlas, acquisition
Three parameters with battery discharge procedure variation tendency, and according to three parameters with battery discharge procedure variation tendency obtain
Battery voltage discreteness with electric discharge changing rule and symmetry with electric discharge changing rule；
Authentication module, for the different monomers cell voltage discreteness using acquisition with the changing rule of electric discharge to according to institute
The different monomers cell voltage discreteness for stating first derivative acquisition is verified with the changing rule of electric discharge, is judged described according to institute
State first derivative acquisition different monomers cell voltage discreteness with electric discharge changing rule whether with according to three parameters with electricity
The different monomers cell voltage discreteness that the variation tendency of tank discharge process obtains is consistent or similar with the changing rule of electric discharge；
And it is led with the changing rule of electric discharge to according to the second order using the different monomers cell voltage symmetry of acquisition
The different monomers cell voltage symmetry that number obtains are verified with the changing rule of electric discharge, judge described to be led according to the second order
Number obtain different monomers cell voltage symmetry with electric discharge changing rule whether with according to three parameters with battery discharge mistake
The different monomers cell voltage symmetry that the variation tendency of journey obtains is consistent or similar with the changing rule of electric discharge.
Content based on the above embodiment, in a kind of optional embodiment, described device further include:
First choice module, if the different monomers cell voltage discreteness for being obtained according to the first derivative is with electric discharge
Changing rule with according to three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness
It is consistent or similar with the changing rule of electric discharge, then battery voltage discreteness is obtained with the variation of electric discharge according to the first derivative
Otherwise rule judges to whether there is other influences electricity in addition to capacity with the variation tendency of battery discharge procedure according to three parameters
Press the factor of inconsistency；
If according to the different monomers cell voltage symmetry of second dervative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage symmetry with electric discharge changing rule
It is consistent or similar, then according to second dervative acquisition different monomers cell voltage symmetry with the changing rule of electric discharge, otherwise,
Different monomers cell voltage symmetry is obtained with the variation tendency of battery discharge procedure according to three parameters to advise with the variation of electric discharge
Rule.
Content based on the above embodiment, in a kind of optional embodiment, described device further include:
Second selecting module, if the different monomers cell voltage discreteness for being obtained according to the first derivative is with electric discharge
Changing rule with according to three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage discreteness
It is consistent or similar in specified discharge time section with the changing rule of electric discharge, then in the specified discharge time section, according to described one
Order derivative obtains battery voltage discreteness joins in the non-specified discharge time section according to three with the changing rule of electric discharge
Number judges the factor that whether there is other influences voltage inconsistency in addition to capacity with the variation tendency of battery discharge procedure；
If according to the different monomers cell voltage symmetry of second dervative acquisition with the changing rule and basis of electric discharge
Three parameters with battery discharge procedure variation tendency obtain different monomers cell voltage symmetry with electric discharge changing rule
It is consistent or similar in specified discharge time section, then in the specified discharge time section, different lists are obtained according to the second dervative
Body cell voltage symmetry is put according to three parameters with battery with the changing rule of electric discharge in the non-specified discharge time section
The variation tendency of electric process obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
Since lithium ion battery discharge process voltage inconsistency estimation device provided in this embodiment can be used for executing
The above-mentioned lithium ion battery discharge process voltage inconsistency estimation method of above-described embodiment, working principle and beneficial effect class
Seemingly, therefore and will not be described here in detail, and particular content can be found in the introduction of above-described embodiment.
Fig. 9 shows the structural schematic diagram of the electronic equipment of further embodiment of this invention.As shown in figure 9, the present embodiment mentions
The electronic equipment of confession, specifically includes following content: processor 601, memory 602, communication interface 603 and bus 604；
Wherein, the processor 601, memory 602, communication interface 603 complete mutual lead to by the bus 604
Letter；The communication interface 603 is for realizing the information between the relevant devices such as each modeling software and intelligent manufacturing equipment module library
Transmission；
The processor 601 is used to call the computer program in the memory 602, and the processor executes the meter
The Overall Steps in above-described embodiment one are realized when calculation machine program, for example, reality when the processor executes the computer program
Existing following step:
Step 101: obtain battery group before cell discharge voltage with volume change probability distribution cloud atlas.
Step 102: the first derivative and second dervative about voltage to capacity are sought to the probability distribution cloud atlas.
Step 103: according to the first derivative, and symmetry being obtained according to the second dervative and is advised with the variation of electric discharge
Rule.
In addition, the logical order in above-mentioned memory can be realized and as independence by way of SFU software functional unit
Product when selling or using, can store in a computer readable storage medium.Based on this understanding, of the invention
Technical solution substantially the part of the part that contributes to existing technology or the technical solution can be with software in other words
The form of product embodies, which is stored in a storage medium, including some instructions use so that
One computer equipment (can be personal computer, server or the network equipment etc.) executes each embodiment institute of the present invention
State all or part of the steps of method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can be with
Store the medium of program code.
Based on identical inventive concept, further embodiment of this invention provides a kind of computer readable storage medium, the meter
It is stored with computer program on calculation machine readable storage medium storing program for executing, which realizes above-described embodiment one when being executed by processor
Overall Steps, for example, the processor execute the computer program when realize following step:
Step 101: obtain battery group before cell discharge voltage with volume change probability distribution cloud atlas.
Step 102: the first derivative and second dervative about voltage to capacity are sought to the probability distribution cloud atlas.
Step 103: battery voltage discreteness is obtained with the changing rule of electric discharge according to the first derivative, and according to
The second dervative obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including institute
State in the process, method, article or equipment of element that there is also other identical elements.
It should be noted that the apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The unit that part illustrates may or may not be physically separated, and component shown as a unit can be or can also
Not to be physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to reality
Need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art exist
In the case where not paying creative labor, it can understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of lithium ion battery discharge process voltage inconsistency estimation method characterized by comprising
Obtain battery group before cell discharge voltage with volume change probability distribution cloud atlas；
First derivative and second dervative about voltage to capacity is sought to the probability distribution cloud atlas；
Different monomers cell voltage distribution discreteness is obtained with the changing rule of electric discharge, and according to institute according to the first derivative
It states second dervative and obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
2. the method according to claim 1, wherein the method also includes:
It is for statistical analysis with Weibull probabilistic model to the probability distribution cloud atlas, three parameters are obtained with battery discharge mistake
The variation tendency of journey, and judge to whether there is other in addition to capacity with the variation tendency of battery discharge procedure according to three parameters
Influence voltage inconsistency factor and symmetry with electric discharge changing rule；
Using the different monomers cell voltage discreteness of acquisition with the changing rule of electric discharge to being obtained according to the first derivative
Different monomers cell voltage discreteness is verified with the changing rule of electric discharge, judge it is described according to the first derivative obtain
Different monomers cell voltage discreteness with electric discharge changing rule whether with the variation according to three parameters with battery discharge procedure
The different monomers cell voltage discreteness that trend obtains is consistent or similar with the changing rule of electric discharge；
And it is obtained with the changing rule of electric discharge to according to the second dervative using the different monomers cell voltage symmetry of acquisition
The different monomers cell voltage symmetry taken is verified with the changing rule of electric discharge, judges described to be obtained according to the second dervative
The different monomers cell voltage symmetry taken with electric discharge changing rule whether with according to three parameters with battery discharge procedure
The different monomers cell voltage symmetry that variation tendency obtains is consistent or similar with the changing rule of electric discharge.
3. according to the method described in claim 2, it is characterized in that, the method also includes:
If the different monomers cell voltage discreteness obtained according to the first derivative is with the changing rule of electric discharge and according to three
Parameter is consistent with the changing rule of electric discharge with the different monomers cell voltage discreteness that the variation tendency of battery discharge procedure obtains
Or it is similar, then according to first derivative acquisition different monomers cell voltage discreteness with the changing rule of electric discharge, otherwise, according to
Three parameters with the variation tendency of battery discharge procedure judge to whether there is in addition to capacity other influences voltage inconsistency because
Element；
If the different monomers cell voltage symmetry obtained according to the second dervative is with the changing rule of electric discharge and according to three
Parameter is consistent with the changing rule of electric discharge with the different monomers cell voltage symmetry that the variation tendency of battery discharge procedure obtains
Or it is similar, then according to second dervative acquisition different monomers cell voltage symmetry with the changing rule of electric discharge, otherwise, according to
Three parameters with the variation tendency of battery discharge procedure judge to whether there is in addition to capacity other influences voltage inconsistency because
Element.
4. according to the method described in claim 2, it is characterized in that, the method also includes:
If the different monomers cell voltage discreteness obtained according to the first derivative is with the changing rule of electric discharge and according to three
Parameter is referring to the different monomers cell voltage discreteness that the variation tendency of battery discharge procedure obtains with the changing rule of electric discharge
Determine that discharge time section is consistent or similar, then obtains a collection of cell voltage with the variation tendency of battery discharge procedure according to three parameters
Discreteness obtains a collection of cell voltage discreteness with putting according to the single battery first derivative with the changing rule of electric discharge
The changing rule of electricity；
If the different monomers cell voltage symmetry obtained according to the second dervative is with the changing rule of electric discharge and according to three
Parameter is referring to the different monomers cell voltage symmetry that the variation tendency of battery discharge procedure obtains with the changing rule of electric discharge
Determine that discharge time section is consistent or similar, then obtains a collection of cell voltage with the variation tendency of battery discharge procedure according to three parameters
Symmetry obtains a collection of cell voltage discreteness with putting according to the single battery second dervative with the changing rule of electric discharge
The changing rule of electricity.
5. a kind of lithium ion battery discharge process voltage inconsistency estimation device characterized by comprising
Module is obtained, for obtaining before battery group cell discharge voltage with the probability distribution cloud atlas of volume change；
Computing module, for seeking first derivative and second dervative about voltage to capacity to the probability distribution cloud atlas；
First estimation module whether there is other influences voltage inconsistency for judging according to the first derivative in addition to capacity
Factor, and according to the second dervative obtain different monomers cell voltage symmetry with electric discharge changing rule.
6. device according to claim 5, which is characterized in that further include:
Second estimation module, for for statistical analysis with Weibull probabilistic model to the probability distribution cloud atlas, acquisition three
Parameter with battery discharge procedure variation tendency, and according to three parameters with battery discharge procedure variation tendency judgement except hold
The outer factor with the presence or absence of other influences voltage inconsistency and symmetry are measured with the changing rule of electric discharge；
Authentication module, for the different monomers cell voltage discreteness using acquisition with the changing rule of electric discharge to according to described one
The different monomers cell voltage discreteness that order derivative obtains is verified with the changing rule of electric discharge, is judged described according to described one
Whether the different monomers cell voltage discreteness that order derivative obtains puts with battery with according to three parameters with the changing rule of electric discharge
The different monomers cell voltage discreteness that the variation tendency of electric process obtains is consistent or similar with the changing rule of electric discharge；
And it is obtained with the changing rule of electric discharge to according to the second dervative using the different monomers cell voltage symmetry of acquisition
The different monomers cell voltage symmetry taken is verified with the changing rule of electric discharge, judges described to be obtained according to the second dervative
The different monomers cell voltage symmetry taken with electric discharge changing rule whether with according to three parameters with battery discharge procedure
The different monomers cell voltage symmetry that variation tendency obtains is consistent or similar with the changing rule of electric discharge.
7. device according to claim 6, which is characterized in that further include:
First choice module, if different monomers cell voltage discreteness for being obtained according to the first derivative is with the change of electric discharge
Law is with the different monomers cell voltage discreteness obtained according to three parameters with the variation tendency of battery discharge procedure with putting
The changing rule of electricity is consistent or similar, then obtains battery voltage discreteness according to the first derivative and advise with the variation of electric discharge
Rule, otherwise, judges to whether there is other influences voltage in addition to capacity with the variation tendency of battery discharge procedure according to three parameters
The factor of inconsistency；
If the different monomers cell voltage symmetry obtained according to the second dervative is with the changing rule of electric discharge and according to three
Parameter is consistent with the changing rule of electric discharge with the different monomers cell voltage symmetry that the variation tendency of battery discharge procedure obtains
Or it is similar, then according to second dervative acquisition different monomers cell voltage symmetry with the changing rule of electric discharge, otherwise, according to
Three parameters obtain different monomers cell voltage symmetry with the changing rule of electric discharge with the variation tendency of battery discharge procedure.
8. device according to claim 6, which is characterized in that further include:
Second selecting module, if different monomers cell voltage discreteness for being obtained according to the first derivative is with the change of electric discharge
Law is with the different monomers cell voltage discreteness obtained according to three parameters with the variation tendency of battery discharge procedure with putting
The changing rule of electricity is consistent or similar in specified discharge time section, then in the specified discharge time section, is led according to the single order
Number judge to whether there is in addition to capacity the factors of other influences voltage inconsistency, in the non-specified discharge time section, according to
Three parameters with the variation tendency of battery discharge procedure judge to whether there is in addition to capacity other influences voltage inconsistency because
Element；
If the different monomers cell voltage symmetry obtained according to the second dervative is with the changing rule of electric discharge and according to three
Parameter is referring to the different monomers cell voltage symmetry that the variation tendency of battery discharge procedure obtains with the changing rule of electric discharge
It is consistent or similar to determine discharge time section, then in the specified discharge time section, different monomers electricity is obtained according to the second dervative
Cell voltage symmetry with electric discharge changing rule, in non-specified discharge time section, according to three parameters with battery discharge mistake
The variation tendency of journey obtains different monomers cell voltage symmetry with the changing rule of electric discharge.
9. a kind of electronic equipment including memory, processor and stores the calculating that can be run on a memory and on a processor
Machine program, which is characterized in that the processor realizes the lithium ion as described in any one of Claims 1-4 when executing described program
The step of battery discharge procedure voltage inconsistency estimation method.
10. a kind of non-transient computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer
The lithium ion battery discharge process voltage inconsistency as described in any one of Claims 1-4 is realized when program is executed by processor
The step of estimation method.
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