CN107093775B - A kind of method for evaluating consistency and device of cascaded structure battery pack - Google Patents
A kind of method for evaluating consistency and device of cascaded structure battery pack Download PDFInfo
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- CN107093775B CN107093775B CN201710308848.4A CN201710308848A CN107093775B CN 107093775 B CN107093775 B CN 107093775B CN 201710308848 A CN201710308848 A CN 201710308848A CN 107093775 B CN107093775 B CN 107093775B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4221—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells with battery type recognition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The embodiment of the invention discloses the method for evaluating consistency and device of a kind of cascaded structure battery pack, single battery intrinsic parameters (such as open-circuit voltage in battery pack is really portrayed in the presence of more difficult for solving existing consistency Online Judge technology, active volume, internal resistance etc.) otherness, and evaluation metrics are not comprehensive enough, the poor disadvantage of applicability, the present invention is based on the monomer battery voltage curve measured, develop the distance similarity index calculating method based on dynamic time warping strategy, it can adaptively reject because SOC difference leads to the influence factor of monomer voltage difference, realize the operation characteristic difference estimation between single battery in charge and discharge process, compared to the existing consistency extracting method based on each discrete instants voltage differences, it is more conducive to excavate battery extrinsic information；On this basis, the abnormal battery statistics recognition methods based on progressive alternate strategy is developed, the Conformance Assessment of cascaded structure battery pack is realized, provides effective technical support for operation maintenance.
Description
Technical field
The present invention relates to cascaded structure battery art more particularly to a kind of Conformance Assessment sides of cascaded structure battery pack
Method and device.
Background technique
Lithium ion battery is because having high-energy density, long circulation life, low self-discharge rate, memory-less effect and pollution-free etc.
Advantage has started to be widely used in the fields such as new-energy automobile and scale energy storage.The use environment of lithium ion battery, when using
Between and the factors such as applying working condition can significantly affect battery performance, the inconsistency meeting with charge and discharge cycles process, between single battery
Increase, battery performance will fail therewith, and then reduce whole service life.Therefore, the consistency evaluation and test of real-time online is developed
Technology is to ensure that the key that good uniformity is kept in battery pack use process, to improving battery pack runnability and safety,
Prolong the service life, plays an important role.
Single battery electric current, the voltage, temperature operation data measured from battery pack, is inside battery electrochemical reaction/biography
The external manifestation for passing coupling has contained inside battery mechanistic information abundant, but how therefrom to have excavated useful information, for electricity
Pond group, which is unanimously evaluated and tested, provides support, and there are also to be studied.Existing consistency of battery pack evaluation index can be divided into two major classes, one is
The parameters such as static evaluation index, including open-circuit voltage, active volume and internal resistance；The second is dynamic assessment index, including charge and discharge
The parameters such as characteristic curve, temperature, electrochemical impedance spectroscopy.It should be noted, however, that only can measure to the battery pack of actual motion
Electric current, voltage and the temperature data of single battery, based on this, the evaluation of Yao Shixian consistency of battery pack needs accurately to estimate
The parameters such as open-circuit voltage, active volume, internal resistance, and then statistical analysis is combined, obtain Conformance Assessment index.The prior art is often
The only voltage between each single battery of simple evaluation, temperature difference extract the statistical indicators such as mean value, variance, gradient, though it can be certain
The consistency between each single battery is characterized in degree, but it is (such as open-circuit voltage, available to embody monomer intrinsic parameters in battery pack
Capacity, internal resistance etc.) otherness.Meanwhile in actual use, in battery pack each single battery state-of-charge (State of
Charge, SOC) often have differences, the prior art directly by comparing each single battery each discrete instants voltage differences,
Coincident indicator is extracted, the otherness in battery pack between each single battery intrinsic parameters is unable to characterize.
Summary of the invention
The embodiment of the invention provides the method for evaluating consistency and device of a kind of cascaded structure battery pack, solve existing
Consistency Online Judge technology, often only between each single battery of simple evaluation in the voltage differences of each discrete instants, extract equal
The statistical indicators such as value, variance, gradient, though the consistency between each single battery can be characterized to a certain extent, by the different of SOC
Cause is affected, and leads to be difficult to really to portray single battery intrinsic parameters (such as open-circuit voltage, active volume, internal resistance in battery pack
Deng) otherness, the consistency evaluation metrics being calculated are not comprehensive enough, and error is larger, applicability it is poor the technical issues of.
A kind of method for evaluating consistency of cascaded structure battery pack provided in an embodiment of the present invention, comprising:
S1: the voltage curve of each single battery in cascaded structure battery pack is obtained；
S2: between the voltage curve by different monomers battery in dynamic time warping policy calculation cascaded structure battery pack
Distance similarity index, obtain the distance similarity index matrix in cascaded structure battery pack between each single battery；
S3: by the abnormal battery discriminating method of the distance similarity index matrix and progressive alternate strategy, to series connection
Structure battery group carries out Conformance Assessment.
Preferably, the step S1 is specifically included:
In cascaded structure battery pack when each single battery charge or discharge, the voltage of different moments each single battery is acquired
Value, obtains voltage curve of each single battery in charge or discharge
Wherein ViIndicate voltage curve of i-th of single battery in charge or discharge, Vi=[Vi1 … ViT]T, T expression
Number of sampling points at the time of i-th of single battery is in charge or discharge, VijIndicate that i-th of single battery is adopted j-th of moment
The voltage value of sampling point, N indicate the number of single battery in cascaded structure battery pack.
Preferably, the step S2 is specifically included:
By the dynamic time warping strategy of symmetric form, the scheduled optimization by the voltage curve of each single battery is public
The scheduled monotonicity constraint of formula and the optimization formula, continuity constraint, the constraint of boundary property and regular window constraint condition, meter
The distance between voltage curve of different monomers battery similarity indices in cascaded structure battery pack are calculated, cascaded structure battery is obtained
Distance similarity index matrix [D in group between each single batterymn]N×N, wherein DmmThat is D (Vm, Vn) it is m-th of single battery
Voltage curve VmWith the voltage curve V of n-th of single batterynThe distance between similarity indices, N indicate cascaded structure battery pack
The number of interior single battery.
Preferably, the step S3 is specifically included:
Pass through the distance similarity index matrix [D between each single battery in cascaded structure battery packmn]N×NWith preset
One formula calculates the average distance similitude in cascaded structure battery pack between m-th of single battery and remaining N-1 single battery
IndexBy the second preset formula, the average distance similarity indices between N number of single battery are calculatedBy to m-th
Average distance similarity indices between single battery and remaining single batteryAverage distance phase between all single batteries
Like property indexCarry out make difference and take absolute value operation and by being ranked up from big to small after, obtain single battery first set P=
{m1..., mN, the value of counter k is obtained, from single battery first set P={ m1..., mNIn remove mkA single battery
Update single battery first set P=P { mk, it is calculated respectively by preset third formula and the 4th preset formula after updating
Single battery first set P=P { mkIn all single battery average distance similarity indices mean value and standard deviation, pass through
MkThe scheduled condition of a single battery, the mean value and the standard deviation carries out consistency to cascaded structure battery pack and comments
Valence.
Preferably, first formula are as follows:
Second formula are as follows:
The third formula are as follows:
4th formula are as follows:
WhereinFor the average distance between m-th of single battery in cascaded structure battery pack and remaining N-1 single battery
Similarity indices, N are the number of single battery in cascaded structure battery pack, DmnThat is D (Vm, Vn) be m-th of single battery electricity
Buckle line VmWith the voltage curve V of n-th of single batterynThe distance between similarity indices,It is flat between N number of single battery
Equal distance similarity index, P are single battery first set, and k is counter, and μ is in updated single battery first set
The mean value of all single battery average distance similarity indices, σ are all monomer electricity in updated single battery first set
The standard deviation of pond average distance similarity indices.
A kind of Conformance Assessment device of the cascaded structure battery pack provided in the embodiment of the present invention, comprising:
Acquiring unit, for obtaining the voltage curve of each single battery in cascaded structure battery pack；
Computing unit, for the electricity by different monomers battery in dynamic time warping policy calculation cascaded structure battery pack
It buckles the distance between line similarity indices, obtains the distance similarity index square in cascaded structure battery pack between each single battery
Battle array；
Evaluation unit, for the abnormal battery identification side by the distance similarity index matrix and progressive alternate strategy
Method carries out Conformance Assessment to cascaded structure battery pack.
Preferably, the acquiring unit specifically includes:
Subelement is acquired, is specifically used in cascaded structure battery pack when each single battery charge or discharge, acquisition is different
The voltage value of moment each single battery；
First obtains subelement, specifically for obtaining voltage curve of each single battery in charge or discharge
Wherein ViIndicate voltage curve of i-th of single battery in charge or discharge, Vi=[Vi1…ViT]T, T expression i-th
Number of sampling points at the time of a single battery is in charge or discharge, VijIndicate i-th of single battery in j-th of instance sample point
Voltage value, N indicate cascaded structure battery pack in single battery number.
Preferably, the computing unit specifically includes:
First computation subunit passes through each single battery specifically for passing through the dynamic time warping strategy of symmetric form
Voltage curve scheduled optimization formula and it is described optimization formula scheduled monotonicity constraint, continuity constraint, boundary property
Constraint and regular window constraint condition calculate the distance between voltage curve of different monomers battery phase in cascaded structure battery pack
Like property index；
Second obtains subelement, refers to specifically for obtaining the distance similarity in cascaded structure battery pack between each single battery
Mark matrix [Dmn]N×N, wherein DmnThat is D (Vm, Vn) be m-th of single battery voltage curve VmWith the voltage of n-th of single battery
Curve VnThe distance between similarity indices, N indicate cascaded structure battery pack in single battery number.
Preferably, the evaluation unit specifically includes:
Second computation subunit, specifically for being referred to by the distance similarity between each single battery in cascaded structure battery pack
Mark matrix [Dmn]N×NWith the first preset formula, m-th of single battery and remaining N-1 list in cascaded structure battery pack are calculated
Average distance similarity indices between body battery
Third computation subunit, specifically for calculating the average distance between N number of single battery by the second preset formula
Similarity indices
Third obtains subelement, specifically for by the average departure between m-th of single battery and remaining single battery
From similarity indicesAverage distance similarity indices between all single batteriesIt carries out making difference and takes absolute value operation simultaneously
After being ranked up from big to small, single battery first set P={ m is obtained1..., mN}；
Subelement is updated, specifically for obtaining the value of counter k, from single battery first set P={ m1..., mNIn move
Except mkA single battery update single battery first set P=P { mk}；
4th computation subunit is updated specifically for being calculated respectively by preset third formula and the 4th preset formula
Single battery first set P=P afterwards { mkIn all single battery average distance similarity indices mean value and standard deviation；
Subelement is evaluated, is specifically used for passing through mkThe scheduled item of a single battery, the mean value and the standard deviation
Part carries out Conformance Assessment to cascaded structure battery pack.
Preferably, first formula are as follows:
Second formula are as follows:
The third formula are as follows:
4th formula are as follows:
WhereinFor the average distance between m-th of single battery in cascaded structure battery pack and remaining N-1 single battery
Similarity indices, N are the number of single battery in cascaded structure battery pack, DmnThat is D (Vm, Vn) be m-th of single battery electricity
Buckle line VmWith the voltage curve V of n-th of single batterynThe distance between similarity indices,It is flat between N number of single battery
Equal distance similarity index, P are single battery first set, and k is counter, and μ is in updated single battery first set
The mean value of all single battery average distance similarity indices, σ are all monomer electricity in updated single battery first set
The standard deviation of pond average distance similarity indices.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
The method for evaluating consistency and device of a kind of cascaded structure battery pack provided in the embodiment of the present invention, wherein one
The method for evaluating consistency of kind cascaded structure battery pack includes: S1: obtaining the voltage of each single battery in cascaded structure battery pack
Curve；S2: between the voltage curve by different monomers battery in dynamic time warping policy calculation cascaded structure battery pack
Distance similarity index obtains the distance similarity index matrix in cascaded structure battery pack between each single battery；S3: pass through institute
The abnormal battery discriminating method for stating distance similarity index matrix and progressive alternate strategy carries out cascaded structure battery pack consistent
Property evaluation.In the present embodiment, by measuring obtained monomer battery voltage curve, develop based on dynamic time warping strategy
Distance similarity index calculating method can be rejected adaptively because SOC difference leads to the influence factor of monomer voltage difference, be realized single
Operation characteristic difference estimation between body battery in charge and discharge process, compared to existing based on the consistent of each discrete instants voltage differences
Property extracting method, is more conducive to excavate battery extrinsic information, on this basis, develops the exception based on progressive alternate strategy
Battery statistics recognition methods realizes the Conformance Assessment of battery pack, provides effective technical support for operation maintenance, solves
Existing consistency Online Judge technology, often only between each single battery of simple evaluation in the voltage differences of each discrete instants,
The statistical indicators such as mean value, variance, gradient are extracted, though the consistency between each single battery can be characterized to a certain extent, by SOC
It is inconsistent be affected, cause to be difficult to really to portray single battery intrinsic parameters in battery pack (such as open-circuit voltage, can with hold
Amount, internal resistance etc.) otherness, the consistency evaluation metrics being calculated are not comprehensive enough, and error is larger, the poor technology of applicability
Problem.
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 only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
A kind of one embodiment of the method for evaluating consistency of the cascaded structure battery pack provided in Fig. 1 embodiment of the present invention
Flow diagram；
A kind of one embodiment of the Conformance Assessment device of the cascaded structure battery pack provided in Fig. 2 embodiment of the present invention
Structural schematic diagram；
A kind of another implementation of the Conformance Assessment device of the cascaded structure battery pack provided in Fig. 3 embodiment of the present invention
The structural schematic diagram of example.
Specific embodiment
The embodiment of the invention provides the method for evaluating consistency and device of a kind of cascaded structure battery pack, existing for solving
Some consistency Online Judge technologies are extracted often only between each single battery of simple evaluation in the voltage differences of each discrete instants
The statistical indicators such as mean value, variance, gradient, though the consistency between each single battery can be characterized to a certain extent, not by SOC
It is unanimously affected, leads to be difficult to really to portray (such as open-circuit voltage, active volume, interior of single battery intrinsic parameters in battery pack
Resistance etc.) otherness, the consistency evaluation metrics being calculated are not comprehensive enough, and error is larger, the poor technical problem of applicability.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, the one of a kind of method for evaluating consistency of the cascaded structure battery pack provided in the embodiment of the present invention
A embodiment includes:
101, the voltage curve of each single battery in cascaded structure battery pack is obtained；
On-line checking is carried out to the voltage of each single battery in cascaded structure battery pack.
102, by the voltage curve of different monomers battery in dynamic time warping policy calculation cascaded structure battery pack it
Between distance similarity index, obtain the distance similarity index matrix in cascaded structure battery pack between each single battery；
103, by the abnormal battery discriminating method of the distance similarity index matrix and progressive alternate strategy, to series connection
Structure battery group carries out Conformance Assessment.
In the present embodiment, the distance similarity calculation method based on dynamic time warping strategy is proposed, it can be rejected
The inconsistent influence of SOC helps to excavate battery extrinsic information, and it is more perfect, reliable to evaluate the consistency between monomer with this；It mentions
Go out the abnormal battery discriminating method based on progressive alternate strategy, is able to achieve the reliable evaluation of battery consistency, and anticipate from statistics
The abnormal battery there are significant difference is picked out in justice, provides effective technical support for subsequent operation maintenance, solves
Existing consistency Online Judge technology mentions often only between each single battery of simple evaluation in the voltage differences of each discrete instants
The statistical indicators such as mean value, variance, gradient are taken, though the consistency between each single battery can be characterized to a certain extent, by SOC's
It is inconsistent to be affected, cause to be difficult to really to portray single battery intrinsic parameters in battery pack (such as open-circuit voltage, active volume,
Internal resistance etc.) otherness, the consistency evaluation metrics being calculated are not comprehensive enough, and error is larger, and the poor technology of applicability is asked
Topic.
The above is that a kind of method for evaluating consistency of cascaded structure battery pack is described in detail, below will be to one kind
The process of the method for evaluating consistency of cascaded structure battery pack is described in detail, a kind of string provided in the embodiment of the present invention
Another embodiment of method for evaluating consistency for being coupled structure battery pack includes:
201, in cascaded structure battery pack when each single battery charge or discharge, acquisition different moments each single battery
Voltage value obtains voltage curve of each single battery in charge or discharge
Wherein ViIndicate voltage curve of i-th of single battery in charge or discharge, Vi=[Vi1…ViT]T, T expression i-th
Number of sampling points at the time of a single battery is in charge or discharge, VijIndicate i-th of single battery in j-th of instance sample point
Voltage value, N indicate cascaded structure battery pack in single battery number；
In each charge or discharge stage, each single battery electricity of different moments is collected and recorded by battery management system
Pressure value, i-th of battery are V in the voltage value of j-th of instance sample pointij, then, i-th of battery is in each charge or discharge rank
The voltage curve of section is represented by Vi=[Vi1 … ViT]T, wherein T is the number of sampling points (upper right in the charge or discharge stage
" T " at angle is to indicate transposition).Therefore, electricity of the battery pack being composed in series by N number of single battery in each charge or discharge stage
Pressure measured value can be expressed as following matrix form:
202, by the dynamic time warping strategy of symmetric form, pass through the scheduled excellent of the voltage curve of each single battery
Scheduled monotonicity constraint, continuity constraint, the constraint of boundary property and the regular window for changing formula and the optimization formula constrain item
Part calculates the distance between voltage curve of different monomers battery similarity indices in cascaded structure battery pack, obtains tandem junction
Distance similarity index matrix [D in structure battery pack between each single batterymn] N × N, wherein DmnThat is D (Vm, Vn) it is single m-th
The voltage curve V of body batterymWith the voltage curve V of n-th of single batterynThe distance between similarity indices, N indicate tandem junction
The number of single battery in structure battery pack；
By obtained each monomer battery voltage curve, it is similar to calculate the distance between different monomers cell voltage profiles
Property index Dmn=D(Vm,Vn), wherein 1≤m, n≤N, m ≠ n, this distance similarity index can be by using dynamic time warping plans
Slightly, it solves following Optimized models to obtain, wherein Optimized model are as follows:
D (V in above formulam, Vn) it is m-th of cell voltage profiles VmWith n-th of cell voltage profiles VnThe distance between it is similar
Property index, qt=(it, jt) it is match point of the regular path in t moment, d (qt) beWithBetween Euler's distance, wtFor
Weight coefficient.Above-mentioned model is solved to be respectively necessary for meeting following monotonicity constraint, continuity constraint, boundary condition constraint and rule
Whole window constraint:
it-1≤it, jt-1≤jt
it-it-1≤ 1, jt-jt-1≤1i1=1, iT=T, j1=1, jT=T
|it-jt|≤r, r are regular window size
Wherein 1≤t≤T, itAnd jtRespectively m-th and n-th of battery electricity corresponding to the regular route matching point of t moment
It buckles the index of line.The dynamic time warping method of symmetric form is used in the present embodiment, then weight wt=(it-it-1)+(jt-
jt-1), thenMeanwhile in the present embodiment, regular window size r is set as T/2.With Dynamic Programming
Method solves above-mentioned computation model, can get following distance similarity index matrix [Dmn] N × N, this matrix is symmetrical matrix, and
Its diagonal line value is 0.Thus, it is only required to solve N (N-1)/2 dynamic programming model, can be obtained between each single battery
Distance similarity index matrix.
203, pass through the distance similarity index matrix [D between each single battery in cascaded structure battery packmn]N×NWith it is preset
The first formula, calculate the average distance phase in cascaded structure battery pack between N-1 single battery of m-th of single battery and remaining
Like property indexBy the second preset formula, the average distance similarity indices between N number of single battery are calculatedBy right
Average distance similarity indices between m-th of single battery and remaining single batteryBeing averaged between all single batteries
Distance similarity indexCarry out make difference and take absolute value operation and by being ranked up from big to small after, obtain single battery first
Set P={ m1..., mN, the value of counter k is obtained, from single battery first set P={ m1..., mNIn remove mkA list
Body battery update single battery first set P=P { mk, pass through preset third formula and the 4th preset formula meter respectively
Calculate updated single battery first set P=P { mkIn all single battery average distance similarity indices mean value and mark
It is quasi- poor, pass through mkThe scheduled condition of a single battery, the mean value and the standard deviation carries out cascaded structure battery pack
Conformance Assessment, first formula are as follows:
Second formula are as follows:
The third formula are as follows:
4th formula are as follows:
WhereinFor the average distance between m-th of single battery in cascaded structure battery pack and remaining N-1 single battery
Similarity indices, N are the number of single battery in cascaded structure battery pack, DmnThat is D (Vm, Vn) be m-th of single battery electricity
Buckle line VmWith the voltage curve V of n-th of single batterynThe distance between similarity indices,It is flat between N number of single battery
Equal distance similarity index, P are single battery first set, and k is counter, and μ is in updated single battery first set
The mean value of all single battery average distance similarity indices, σ are all monomer electricity in updated single battery first set
The standard deviation of pond average distance similarity indices.
By the distance similarity index matrix of acquisition, the abnormal battery discriminating method (note: institute based on progressive alternate strategy
Abnormal battery is called to refer to and significant difference in other monomers battery intrinsic parameters existing probability meaning in cascaded structure battery pack
Battery), realize consistency of battery pack evaluation, the specific steps are as follows:
(1) the average distance similarity indices between each single battery and other monomers are calculated
(2) the average distance similarity indices between all single batteries are calculated
(3) it to each single battery, calculatesValue, and by the single battery set after being ranked up from big to small
It is denoted as { m1..., mN, then note normal battery set P={ m1..., mN, abnormal batteries integrated S={ Ф } (empty set)；
(4) counter k=1 is set, and wherein k is only used as a counter, is used as mkSubscript, using as battery rope
Draw；
(5) m is removed from normal battery set PkA battery cell, i.e. P=P { mk}；
(6) mean value of all battery average distance similarity indices in normal battery set P is calculated separately as follows
And standard deviation:
(7) ifThen show mkThere are significant differences with other batteries for a battery cell, are added into
Abnormal batteries integrated, i.e. S=S ∪ { mk, k=k+1 is set, if k≤N, returns to (5) step；
(8) if S is empty set, show that consistency of battery pack is good；Otherwise, there are intrinsic parameters significant differences in battery pack
Abnormal battery collection S, it will provide support for subsequent consistency operation maintenance.
In the present embodiment, for the battery pack system with cascaded structure, a kind of general, flexible battery pack one is proposed
Cause property evaluation method, it can be in the case where each single battery be inconsistent there are SOC, by using dynamic time warping plan
Slightly, the otherness of intrinsic parameters between each single battery is reliably picked out, Distance conformability degree calculation method is proposed；As base
Plinth, the present embodiment also proposed the abnormal battery discriminating method based on progressive alternate strategy, can quickly and reliably pick out and deposit
It is solved in the abnormal battery of significant statistical discrepancy to realize that the specific aim operation maintenance of battery pack provides effective technical support
Existing consistency Online Judge technology, often only between each single battery of simple evaluation in the voltage differences of each discrete instants,
The statistical indicators such as mean value, variance, gradient are extracted, though the consistency between each single battery can be characterized to a certain extent, by SOC
It is inconsistent be affected, cause to be difficult to really to portray single battery intrinsic parameters in battery pack (such as open-circuit voltage, can with hold
Amount, internal resistance etc.) otherness, the consistency evaluation metrics being calculated are not comprehensive enough, and error is larger, the poor technology of applicability
Problem.
Referring to Fig. 2, one, Conformance Assessment device of a kind of cascaded structure battery pack provided in the embodiment of the present invention
Embodiment, comprising:
Acquiring unit 301, for obtaining the voltage curve of each single battery in cascaded structure battery pack；
Computing unit 302, for passing through different monomers battery in dynamic time warping policy calculation cascaded structure battery pack
The distance between voltage curve similarity indices, obtain the distance similarity in cascaded structure battery pack between each single battery and refer to
Mark matrix；
Evaluation unit 303, for being known by the abnormal battery of the distance similarity index matrix and progressive alternate strategy
Other method carries out Conformance Assessment to cascaded structure battery pack.
In the present embodiment, the voltage change curve of each single battery is obtained by acquiring unit 301, passes through computing unit
302 use the distance similarity calculation methods based on dynamic time warping strategy, in charge and discharge between ART network single battery
Operation characteristic difference in the process helps to excavate battery extrinsic information, with this evaluate the consistency between monomer it is more perfect,
Reliably；On this basis, evaluation unit 303 develops the abnormal battery discriminating method based on progressive alternate strategy, statistically
It can be identified the abnormal battery there are significant difference, provide effective technical support for subsequent operation maintenance, solve existing
Some consistency Online Judge technologies are extracted often only between each single battery of simple evaluation in the voltage differences of each discrete instants
The statistical indicators such as mean value, variance, gradient, though the consistency between each single battery can be characterized to a certain extent, not by SOC
It is unanimously affected, leads to be difficult to really to portray (such as open-circuit voltage, active volume, interior of single battery intrinsic parameters in battery pack
Resistance etc.) otherness, the consistency evaluation metrics being calculated are not comprehensive enough, and error is larger, the poor technical problem of applicability.
The above is that a kind of Conformance Assessment device each unit of cascaded structure battery pack is described in detail, and below will
A kind of each extra cell of Conformance Assessment device of cascaded structure battery pack is described in more detail, referring to Fig. 3, this hair
The Conformance Assessment device of a kind of cascaded structure battery pack another embodiment provided in bright embodiment, comprising:
Acquiring unit 401, for obtaining the voltage curve of each single battery in cascaded structure battery pack；
The acquiring unit 401 specifically includes:
Subelement 4011 is acquired, acquisition in cascaded structure battery pack when each single battery charge or discharge is specifically used for
The voltage value of different moments each single battery；
First obtains subelement 4012, specifically for obtaining voltage curve of each single battery in charge or discharge
Wherein ViIndicate voltage curve of i-th of single battery in charge or discharge, Vi=[Vi1…ViT]T, T indicates the
Number of sampling points at the time of i single battery is in charge or discharge, VijIndicate i-th of single battery in j-th of instance sample
The voltage value of point, N indicate the number of single battery in cascaded structure battery pack.
Computing unit 402, for passing through different monomers battery in dynamic time warping policy calculation cascaded structure battery pack
The distance between voltage curve similarity indices, obtain the distance similarity in cascaded structure battery pack between each single battery and refer to
Mark matrix；
The computing unit 402 specifically includes:
First computation subunit 4021 passes through each monomer specifically for passing through the dynamic time warping strategy of symmetric form
Scheduled monotonicity constraint, the continuity constraint, side of the scheduled optimization formula of the voltage curve of battery and the optimization formula
Criticality constraint and regular window constraint condition, calculate cascaded structure battery pack in different monomers battery voltage curve between away from
From similarity indices；
Second obtains subelement 4022, similar specifically for the distance between each single battery in acquisition cascaded structure battery pack
Property index matrix [Dmn]N×N, wherein DmnThat is D (Vm, Vn) be m-th of single battery voltage curve VmWith n-th single battery
Voltage curve VnThe distance between similarity indices, N indicate cascaded structure battery pack in single battery number.
Evaluation unit 403, for being known by the abnormal battery of the distance similarity index matrix and progressive alternate strategy
Other method carries out Conformance Assessment to cascaded structure battery pack.
The evaluation unit 403 specifically includes:
Second computation subunit 4031, specifically for similar by the distance between each single battery in cascaded structure battery pack
Property index matrix [Dmn]N×NWith the first preset formula, m-th of single battery and remaining N-1 in cascaded structure battery pack are calculated
Average distance similarity indices between a single battery
Third computation subunit 4032, specifically for by the second preset formula, calculating being averaged between N number of single battery
Distance similarity index
Third obtains subelement 4033, specifically for by flat between m-th of single battery and remaining single battery
Equal distance similarity indexAverage distance similarity indices between all single batteriesIt carries out making difference and the fortune that takes absolute value
Calculate and by being ranked up from big to small after, obtain single battery first set P={ m1..., mN}；
Subelement 4034 is updated, specifically for obtaining the value of counter k, from single battery first set P={ m1..., mN}
Middle removal mkA single battery update single battery first set P=P { mk}；
4th computation subunit 4035, specifically for being calculated respectively by preset third formula and the 4th preset formula
Updated single battery first set P=P { mkIn all single battery average distance similarity indices mean value and standard
Difference；
Subelement 4036 is evaluated, is specifically used for passing through mkA single battery, the mean value and the standard deviation it is predetermined
Condition, to cascaded structure battery pack carry out Conformance Assessment.
Further,
First formula are as follows:
Second formula are as follows:
The third formula are as follows:
4th formula are as follows:
WhereinFor the average distance between m-th of single battery in cascaded structure battery pack and remaining N-1 single battery
Similarity indices, N are the number of single battery in cascaded structure battery pack, DmnThat is D (Vm, Vn) be m-th of single battery electricity
Buckle line VmWith the voltage curve V of n-th of single batterynThe distance between similarity indices,It is flat between N number of single battery
Equal distance similarity index, P are single battery first set, and k is counter, and μ is in updated single battery first set
The mean value of all single battery average distance similarity indices, σ are all monomer electricity in updated single battery first set
The standard deviation of pond average distance similarity indices.
In the present embodiment, for the battery pack system of cascaded structure, obtained single battery electricity is measured with acquiring unit 401
It buckles based on line, computing unit 402 develops the distance similarity index calculating method based on dynamic time warping strategy, it
It can adaptively reject because SOC difference leads to the influence factor of monomer voltage difference, realize between single battery in charge and discharge process
Operation characteristic difference estimation be more conducive to dig compared to the existing consistency extracting method based on each discrete instants voltage differences
Excavate battery extrinsic information；On this basis, evaluation unit 403 develops the knowledge of the abnormal battery statistics based on progressive alternate strategy
Other method, realizes the Conformance Assessment of battery pack, provides effective technical support for operation maintenance, solves existing one
Cause property Online Judge technology extracts mean value, side often only between each single battery of simple evaluation in the voltage differences of each discrete instants
The statistical indicators such as difference, gradient, though the consistency between each single battery can be characterized to a certain extent, by the inconsistent shadow of SOC
Sound is larger, leading to be difficult to really to portray single battery intrinsic parameters in battery pack (such as open-circuit voltage, active volume, internal resistance)
Otherness, the consistency evaluation metrics being calculated are not comprehensive enough, and error is larger, the poor technical problem of applicability.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.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 store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (6)
1. a kind of method for evaluating consistency of cascaded structure battery pack characterized by comprising
S1: the voltage curve of each single battery in cascaded structure battery pack is obtained；
S2: by between the voltage curve of different monomers battery in dynamic time warping policy calculation cascaded structure battery pack away from
From similarity indices, the distance similarity index matrix in cascaded structure battery pack between each single battery is obtained；
S3: pass through the distance similarity index matrix [D between each single battery in cascaded structure battery packmn]N×NWith preset first
Formula calculates the average distance similitude in cascaded structure battery pack between m-th of single battery and remaining N-1 single battery and refers to
MarkBy the second preset formula, the average distance similarity indices between N number of single battery are calculatedBy to m-th
Average distance similarity indices between single battery and remaining single batteryAverage distance phase between all single batteries
Like property indexCarry out make difference and take absolute value operation and by being ranked up from big to small after, obtain single battery first set P
={ m1..., mN, the value of counter k is obtained, from single battery first set P={ m1..., mNIn remove mkA monomer electricity
Pond update single battery first set P=P { mk, it is calculated more by preset third formula and the 4th preset formula respectively
Single battery first set P=P after new { mkIn all single battery average distance similarity indices mean value and standard
Difference passes through mkThe scheduled condition of a single battery, the mean value and the standard deviation carries out one to cascaded structure battery pack
The evaluation of cause property；
First formula are as follows:
Second formula are as follows:
The third formula are as follows:
4th formula are as follows:
WhereinAverage distance between m-th of single battery in cascaded structure battery pack and remaining N-1 single battery is similar
Property index, N be cascaded structure battery pack in single battery number, DmnThat is D (Vm, Vn) be m-th single battery voltage it is bent
Line VmWith the voltage curve V of n-th of single batterynThe distance between similarity indices,For the average departure between N number of single battery
From similarity indices, P is single battery first set, and k is counter, and μ is to own in updated single battery first set
The mean value of single battery average distance similarity indices, σ are that all single batteries are flat in updated single battery first set
The standard deviation of equal distance similarity index.
2. the method for evaluating consistency of cascaded structure battery pack according to claim 1, which is characterized in that the step S1
It specifically includes:
In cascaded structure battery pack when each single battery charge or discharge, the voltage value of different moments each single battery is acquired,
Obtain voltage curve of each single battery in charge or discharge
Wherein ViIndicate voltage curve of i-th of single battery in charge or discharge, Vi=[Vi1 … ViT]T, i-th of T expression
Number of sampling points at the time of single battery is in charge or discharge, VijIndicate i-th of single battery in j-th instance sample point
Voltage value, N indicate the number of single battery in cascaded structure battery pack.
3. the method for evaluating consistency of cascaded structure battery pack according to claim 2, which is characterized in that the step S2
It specifically includes:
By the dynamic time warping strategy of symmetric form, by the scheduled optimization formula of the voltage curve of each single battery and
Scheduled monotonicity constraint, continuity constraint, the constraint of boundary property and the regular window constraint condition of the optimization formula, calculate string
It is coupled the distance between voltage curve of different monomers battery similarity indices in structure battery pack, obtains in cascaded structure battery pack
Distance similarity index matrix [D between each single batterymn]N×N, wherein DmnThat is D (Vm, Vn) be m-th of single battery voltage
Curve VmWith the voltage curve V of n-th of single batterynThe distance between similarity indices, N indicate single in cascaded structure battery pack
The number of body battery.
4. a kind of Conformance Assessment device of cascaded structure battery pack characterized by comprising
Acquiring unit, for obtaining the voltage curve of each single battery in cascaded structure battery pack；
Computing unit, it is bent for the voltage by different monomers battery in dynamic time warping policy calculation cascaded structure battery pack
The distance between line similarity indices obtain the distance similarity index matrix in cascaded structure battery pack between each single battery；
Evaluation unit, comprising: the second computation subunit, specifically for by between each single battery in cascaded structure battery pack away from
From similarity indices matrix [Dmn]N×NWith the first preset formula, calculate cascaded structure battery pack in m-th of single battery and its
Average distance similarity indices between remaining N-1 single battery
Third computation subunit, specifically for by the second preset formula, the average distance calculated between N number of single battery is similar
Property index
Third obtains subelement, specifically for by between the average distance phase m-th of single battery and remaining single battery
Like property indexAverage distance similarity indices between all single batteriesCarry out make difference and take absolute value operation and by from
After arriving small be ranked up greatly, single battery first set P={ m is obtained1..., mN}；
Subelement is updated, specifically for obtaining the value of counter k, from single battery first set P={ m1..., mNIn remove the
mkA single battery update single battery first set P=P { mk}；
4th computation subunit is calculated specifically for respectively by preset third formula and the 4th preset formula updated
Single battery first set P=P { mkIn all single battery average distance similarity indices mean value and standard deviation；
Subelement is evaluated, is specifically used for passing through mkThe scheduled condition of a single battery, the mean value and the standard deviation is right
Cascaded structure battery pack carries out Conformance Assessment；
First formula are as follows:
Second formula are as follows:
The third formula are as follows:
4th formula are as follows:
WhereinAverage distance between m-th of single battery in cascaded structure battery pack and remaining N-1 single battery is similar
Property index, N be cascaded structure battery pack in single battery number, DmnThat is D (Vm, Vn) be m-th single battery voltage it is bent
Line VmWith the voltage curve V of n-th of single batterynThe distance between similarity indices,For the average departure between N number of single battery
From similarity indices, P is single battery first set, and k is counter, and μ is to own in updated single battery first set
The mean value of single battery average distance similarity indices, σ are that all single batteries are flat in updated single battery first set
The standard deviation of equal distance similarity index.
5. the Conformance Assessment device of cascaded structure battery pack according to claim 4, which is characterized in that the acquisition is single
Member specifically includes:
Subelement is acquired, is specifically used for acquiring different moments in cascaded structure battery pack when each single battery charge or discharge
The voltage value of each single battery；
First obtains subelement, specifically for obtaining voltage curve of each single battery in charge or discharge
Wherein ViIndicate voltage curve of i-th of single battery in charge or discharge, Vi=[Vi1 … ViT]T, i-th of T expression
Number of sampling points at the time of single battery is in charge or discharge, VijIndicate t-th of single battery in j-th instance sample point
Voltage value, N indicate the number of single battery in cascaded structure battery pack.
6. the Conformance Assessment device of cascaded structure battery pack according to claim 5, which is characterized in that the calculating is single
Member specifically includes:
First computation subunit passes through the electricity of each single battery specifically for passing through the dynamic time warping strategy of symmetric form
Buckle line scheduled optimization formula and the optimization scheduled monotonicity constraint of formula, continuity constraint, the constraint of boundary property
With regular window constraint condition, the distance between voltage curve of different monomers battery similitude in cascaded structure battery pack is calculated
Index；
Second obtains subelement, specifically for obtaining the distance similarity index square in cascaded structure battery pack between each single battery
Battle array [Dmn]N×N, wherein DmnThat is D (Vm, Vn) be m-th of single battery voltage curve VmWith the voltage curve of n-th of single battery
VnThe distance between similarity indices, N indicate cascaded structure battery pack in single battery number.
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| CN107643495A (en) * | 2017-11-08 | 2018-01-30 | 中国科学院电工研究所 | A kind of battery consistency evaluation method based on principal component analysis |
| CN109814043A (en) * | 2017-11-17 | 2019-05-28 | 上海国际汽车城（集团）有限公司 | Cascaded structure Li-ion batteries piles consistency visual evaluating method |
| CN109127478A (en) * | 2018-10-19 | 2019-01-04 | 合肥澎湃能源技术有限公司 | Method for screening the single battery of battery pack |
| CN109127477A (en) * | 2018-10-19 | 2019-01-04 | 合肥澎湃能源技术有限公司 | System for screening the single battery of battery pack |
| CN111451159A (en) * | 2019-01-18 | 2020-07-28 | 上海什弋维新能源科技有限公司 | Method for rapidly screening capacity of single battery in battery module |
| DE102020108326A1 (en) * | 2020-03-26 | 2021-09-30 | Audi Aktiengesellschaft | Method for recognizing an external cell and / or an external module in a battery device of a vehicle as well as a battery device and a motor vehicle with a battery device |
| CN111693876A (en) * | 2020-05-09 | 2020-09-22 | 清华大学 | Battery pack evaluation method and system |
| CN111707951B (en) * | 2020-06-22 | 2021-04-06 | 北京理工大学 | Battery pack consistency evaluation method and system |
| WO2022032674A1 (en) * | 2020-08-14 | 2022-02-17 | Beijing Didi Infinity Technology And Development Co., Ltd. | Systems and methods for detecting abnormal charging events |
| CN112433161B (en) * | 2020-10-12 | 2021-12-03 | 珠海格力电器股份有限公司 | Automatic battery parameter identification method |
| CN113433468A (en) * | 2021-05-12 | 2021-09-24 | 山东大学 | Early fault fusion diagnosis method and safety early warning system for energy storage battery |
| CN113917351B (en) * | 2021-10-09 | 2023-12-22 | 长沙理工大学 | Online evaluation method for inconsistency of battery clusters of energy storage power station based on capacity change |
| CN113759252A (en) * | 2021-10-09 | 2021-12-07 | 长沙理工大学 | Online evaluation method for inconsistency of battery clusters of energy storage power station based on direct-current internal resistance ir voltage drop |
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