CN109085507A - A kind of method and system for assessing energy-storage battery health status - Google Patents
A kind of method and system for assessing energy-storage battery health status Download PDFInfo
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Abstract
The present invention provides a kind of method and system of health status for assessing energy-storage battery, described method and system passes through the SOC curve under complicated operating condition, using Method of Seeking Derivative, obtain DOD time series, and based on the SOH attenuation characteristic in the different sections DOD, according to the SOH and cycle-index curve in section where DOD sequence, circulation is solved, and obtains the energy-storage battery health status under complicated operating condition after the effect of SOC curve.This method and system and the prior art are based on qualitative method anticipation energy storage life cycle more, propose the establishment method of DOD sequence, and the SOH appraisal procedure of the complex working condition curve effect under more DOD sequences, be conducive to the accuracy for improving energy-storage battery health state evaluation.
Description
Technical field
The present invention relates to technical field of energy storage, and more particularly, to a kind of side for assessing energy-storage battery health status
Method and system.
Background technique
Energy storage as the important composition part in electric system, can extensive renewable energy power generation, conventional electric power generation side,
Power transmission and distribution side, electricity consumption side, ancillary service etc. play a significant role.It is shown according to newest statistical data, by 2017
Bottom, the accumulative installation 2926.6MW in electrochemical energy storage power station of putting into operation in global range, wherein the installation accounting of lithium ion battery energy storage
Maximum is 75% or more, is secondly sodium-sulfur battery energy storage, lead storage battery energy storage, flow battery energy storage etc., is mainly used in concentration
Formula renewable energy is grid-connected, electric system ancillary service, user side, grid side and source side etc..Service life is to determine energy storage
One of the key parameters that can system promote and apply, it is related with the factors such as energy-storage system self-technique characteristic, operating condition operation curve,
The assessment of service life is usually with energy-storage battery health status (State Of Health, SOH) for index, when energy-storage battery is strong
When health state is lower than the exit criteria being arranged, energy-storage system end-of-life.Energy-storage battery health status is defined as remaining battery
Active volume and the stylish battery that puts into operation just begin the ratio of discharge capacity.In the energy-storage system operation phase, remaining active volume by
Step decaying, the principal element for influencing the battery capacity rate of decay are depth of discharge (Depth of Discharge, DOD), follow
Environment temperature etc. in ring number, energy-accumulating power station.Environment temperature dependent station itself temperature control device in energy-accumulating power station is accurate in real time
Control, usually ignores the influence that the environment temperature in energy-accumulating power station decays to battery capacity.Therefore, battery capacity is actually influenced
The principal element of the rate of decay is depth of discharge (Depth of Discharge, DOD) and cycle-index, therefore how according to storage
Can battery DOD and cycle-index determine that the health status of energy-storage battery just becomes a urgent problem.
Summary of the invention
In order to solve how to determine according to the DOD of energy-storage battery and cycle-index the health status SOH of energy-storage battery
Technical problem, the present invention provides a kind of methods for assessing energy-storage battery health status, which comprises
Data in step 1, calling energy-storage battery test database, numerical fitting form energy-storage system depth of discharge
The curve SOH of DOD the energy-storage battery health status SOH on the I section divided and cycle-index relationship ni=f (n,
DODi), for i-th of section DOD, SOHiTake DODiFor the test data matched curve of the first setting value, wherein the SOH is
The active volume of remaining battery and the stylish battery that puts into operation just begin the ratio of discharge capacity, and I is natural number, 1≤i≤I；
Step 2, for SOC=g (t) line under energy storage complexity operating condition, at the time of with g ' (t)=0 and g " (t)≤0
For initial time, at the time of analyzing g ' (t)=0, time series t is formedj,1≤j≤N；
Step 3, according to SOC=g (t) curve, calculate time series tjCorresponding SOC sequence SOCj；
Step 4, according to SOC sequence SOCjForm DOD sequence D ODk, wherein j, k be natural number, 1≤j≤N, 1≤k≤
[N/2]；
Step 5, according to DODkThe SOH and cycle-index curve in the place section DOD calculate SOH when cycle-index is 1k,
Enable k=1；
Step 6, according to DODk+1The SOH and cycle-index curve in the place section DOD, calculate SOHkCorresponding charge and discharge follow
Ring frequency nk, calculate nkSOH after+1 effectk+1, k=k+1 is enabled, step 6 is repeated and goes to step 7 as k+1=[N/2]；
Step 7, as k+1=[N/2], DOD is calculated[N/2]SOH after effect[N/2]Value, the SOH[N/2]Value is
Energy-storage battery health status value after performance curve effect.
Further, described to form energy-storage system depth of discharge DOD on the I section divided in numerical fitting
Before the curve of energy-storage battery health status SOH and cycle-index relationship n further include:
Energy-storage battery test database is established, when including different DOD in the database, the health status of energy-storage battery
The data of SOH and cycle-index relationship n；
The value of DOD is divided into I section, wherein in i-th of section DOD, the value range of DODi is (i-1/I, i/
I], I is natural number, 1≤i≤I.
Further, described for i-th of section DOD, SOHiTake DODiFor the test data matched curve of the first setting value
Refer to for i-th of section DOD, SOHiTake DODiFor the test data matched curve of (i-0.5)/I, it is denoted as:
Further, described according to SOC sequence SOCjForm DOD sequence D ODk, its calculation formula is:
DODk=SOCj-SOCj+1=SOC2k-1-SOC2k
In formula, j, k be natural number, j=2k-1,1≤j≤N, 1≤k≤[N/2].
Further, the precision of the SOH of the energy-storage battery of the method assessment is related with the interval number that DOD is divided, and I is got over
Greatly, section is more, and the assessment result precision of energy-storage battery SOH is higher.
According to another aspect of the present invention, the present invention provides a kind of system for assessing energy-storage battery health status, the system
System includes:
SOH curve determining unit is used to call the data in energy-storage battery test database, and numerical fitting forms energy storage
The song of system depth of discharge DOD the energy-storage battery health status SOH on the I section divided and cycle-index relationship n
Line SOHi=f (n, DODi), for i-th of section DOD, SOHiTake DODiFor the test data matched curve of the first setting value,
In, the SOH is the ratio for the discharge capacity that begins at the beginning of the active volume of remaining battery and the stylish battery that puts into operation, and I is natural number, 1≤i
≤I；
Time series determination unit is used for for SOC=g (t) line under energy storage complexity operating condition, with g ' (t)=0
And be initial time at the time of g " (t)≤0, at the time of analyzing g ' (t)=0, form time series tj,1≤j≤N；
SOC sequence determination unit is used to calculate time series t according to SOC=g (t) curvejCorresponding SOC sequence
SOCj；
DOD sequence determination unit is used for according to SOC sequence SOCjForm DOD sequence D ODk, wherein j, k are natural number,
1≤j≤N, 1≤k≤[N/2]；
Initial SOH determination unit, is used for according to DODkThe SOH and cycle-index curve in the place section DOD, calculate circulation
SOH when number is 1k, enable k=1；
SOH cycle calculations unit, is used for according to DODk+1The SOH and cycle-index curve in the place section DOD, calculate
SOHkCorresponding charge and discharge cycles frequency nk, calculate nkSOH after+1 effectk+1, k=k+1 is enabled, SOH cycle calculations unit carries out
Cycle calculations go to SOH determination unit as k+1=[N/2]；
SOH determination unit is used to that DOD to be calculated as k+1=[N/2][N/2]SOH after effect[N/2]Value, it is described
SOH[N/2]Value is the energy-storage battery health status value after performance curve effect.
Further, the system also includes:
Database Unit is used to establish energy-storage battery test database, when including different DOD in the database, storage
The data of the health status SOH and cycle-index relationship n of energy battery；
DOD interval division unit is used to the value of DOD dividing I section, wherein in i-th of section DOD, DODi
Value range be (i-1/I, i/I], I is natural number, 1≤i≤I.
Further, in the SOH curve determining unit, SOHiTake DODiIt is fitted for the generation test data of (i-0.5)/I
Curve is denoted as:
Further, the DOD sequence determination unit is according to SOC sequence SOCjForm DOD sequence D ODk, calculation formula
Are as follows:
DODk=SOCj-SOCj+1=SOC2k-1-SOC2k
In formula, j, k are natural number, j=2k-1,1≤j≤N, 1≤k≤[N/2].
Further, the I of the DOD interval division unit setting is bigger, and section is more, the system evaluation energy-storage battery
The assessment result precision of SOH is higher.
The method and system of the health status for the assessment energy-storage battery that technical solution of the present invention provides, runs work by complexity
SOC curve under condition obtains DOD time series using Method of Seeking Derivative, and based on the SOH attenuation characteristic in the different sections DOD,
According to the SOH and cycle-index curve in section where DOD sequence, circulation is solved, and is obtained SOC curve under complicated operating condition and is acted on
Energy-storage battery health status afterwards.This method and system go out from the capacity fade characteristics of energy-storage system technical characteristic and energy-storage battery
Hair, it is true using Method of Seeking Derivative according to the relationship of energy-storage battery health status SOH and cycle-index under different depth of discharge DOD
DOD sequence under vertical energy-storage battery complexity operating condition can use appearance to assess the residue after energy-storage battery performance curve acts on
Amount quantitatively calculates the life cycle under the effect of energy-storage battery complexity operating condition curve, for energy storage system capacity configuration and full longevity
The research of life period economic evaluation problem provides the foundation.The prior art is based on qualitative method anticipation energy storage life cycle more,
The invention proposes under the establishment method of DOD sequence and more DOD sequences complex working condition curve effect SOH appraisal procedure,
Be conducive to improve the accuracy of energy-storage battery health state evaluation.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is the flow chart according to the method for the assessment energy-storage battery health status of the preferred embodiment for the present invention；
Fig. 2 is the structural schematic diagram according to the system of the competition energy-storage battery health status of the preferred embodiment for the present invention.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is the flow chart according to the method for the assessment energy-storage battery health status of the preferred embodiment for the present invention.Such as Fig. 1
It is shown, the method for energy-storage battery health status is assessed described in this preferred embodiment since step 101.
In step 101, energy-storage battery test database is established, when including different DOD in the database, energy-storage battery
The data of health status SOH and cycle-index relationship n；
In step 102, the value of DOD is divided into I section, wherein in i-th of section DOD, DODiValue range be
(i-1/I, i/I], I is natural number, 1≤i≤I.
In step 103, the data in energy-storage battery test database are called, it is deep that numerical fitting forms energy-storage system charge and discharge
Spend the curve SOH of energy-storage battery health status SOH and cycle-index relationship n of the DOD on the I section dividedi=f (n,
DODi), for i-th of section DOD, SOHiTake DODiFor the test data matched curve of the first setting value, wherein the SOH is
The active volume of remaining battery and the stylish battery that puts into operation just begin the ratio of discharge capacity, and I is natural number, 1≤i≤I；
In step 104, for SOC=g (t) line under energy storage complexity operating condition, with g ' (t)=0 and g " (t)≤0
Moment is initial time, at the time of analyzing g ' (t)=0, forms time series tj,1≤j≤N；
Time series t is calculated according to SOC=g (t) curve in step 105jCorresponding SOC sequence SOCj；
In step 106, according to SOC sequence SOCjForm DOD sequence D ODk, wherein j, k are natural number, 1≤j≤N, 1≤k
≤[N/2]；
In step 107, according to DODkThe SOH and cycle-index curve in the place section DOD are calculated when cycle-index is 1
SOHk, enable k=1；
In step 108, according to DODk+1The SOH and cycle-index curve in the place section DOD, calculate SOHkCorresponding charge and discharge
Electric cycle-index nk, calculate nkSOH after+1 effectk+1, k=k+1 is enabled, step 108 is repeated and goes to step as k+1=[N/2]
Rapid 109；
DOD is calculated as k+1=[N/2] in step 109[N/2]SOH after effect[N/2]Value, the SOH[N/2]Value
Energy-storage battery health status value as after performance curve effect.
Preferably, described for i-th of section DOD, it is the test data matched curve of the first setting value that SOHi, which takes DODi,
Refer to for i-th of section DOD, SOHiTake DODiFor the test data matched curve of (i-0.5)/I, it is denoted as:
Preferably, described according to SOC sequence SOCjForm DOD sequence D ODk, its calculation formula is:
DODk=SOCj-SOCj+1=SOC2k-1-SOC2k
In formula, j, k be natural number, j=2k-1,1≤j≤N, 1≤k≤[N/2].
Preferably, the precision of the SOH of the energy-storage battery of the method assessment is related with the interval number that DOD is divided, and I is bigger,
Section is more, and the assessment result precision of energy-storage battery SOH is higher.
Fig. 2 is the structural schematic diagram according to the system of the competition energy-storage battery health status of the preferred embodiment for the present invention.
As shown in Fig. 2, the system 200 for assessing energy-storage battery health status described in this preferred embodiment includes:
Database Unit 201 is used to establish energy-storage battery test database, when including different DOD in the database,
The data of the health status SOH and cycle-index relationship n of energy-storage battery；
DOD interval division unit 202 is used to the value of DOD dividing I section, wherein in i-th of section DOD,
DODiValue range be (i-1/I, i/I], I is natural number, 1≤i≤I.
SOH curve determining unit 203 is used to call the data in energy-storage battery test database, and numerical fitting is formed
Energy-storage battery health status SOH of the energy-storage system depth of discharge DOD on the I section divided and cycle-index relationship n
Curve SOHi=f (n, DODi), for i-th of section DOD, SOHiTake DODiSong is fitted for the test data of the first setting value
Line, wherein the SOH is the ratio for the discharge capacity that begins at the beginning of the active volume of remaining battery and the stylish battery that puts into operation, and I is nature
Number, 1≤i≤I；
Time series determination unit 204 is used for for SOC=g (t) line under energy storage complexity operating condition, with g ' (t)
It is initial time at the time of=0 and g " (t)≤0, at the time of analyzing g ' (t)=0, forms time series tj,1≤j≤N；
SOC sequence determination unit 205 is used to calculate time series t according to SOC=g (t) curvejCorresponding SOC sequence
Arrange SOCj；
DOD sequence determination unit 206 is used for according to SOC sequence SOCjForm DOD sequence D ODk, wherein j, k are nature
Number, 1≤j≤N, 1≤k≤[N/2]；
Initial SOH determination unit 207, is used for according to DODkThe SOH and cycle-index curve in the place section DOD, calculate
SOH when cycle-index is 1k, enable k=1；
SOH cycle calculations unit 208, is used for according to DODk+1The SOH and cycle-index curve in the place section DOD, calculate
SOHkCorresponding charge and discharge cycles frequency nk, calculate nkSOH after+1 effectk+1, enable k=k+1, SOH cycle calculations unit 208 into
Row cycle calculations go to SOH determination unit 209 as k+1=[N/2]；
SOH determination unit 209 is used to that DOD to be calculated as k+1=[N/2][N/2]SOH after effect[N/2]Value,
The SOH[N/2]Value is the energy-storage battery health status value after performance curve effect.
Preferably, in the SOH curve determining unit 203, SOHiTake DODiIt is quasi- for the generation test data of (i-0.5)/I
Curve is closed, is denoted as:
Preferably, the DOD sequence determination unit 206 is according to SOC sequence SOCjForm DOD sequence D ODk, calculation formula
Are as follows:
DODk=SOCj-SOCj+1=SOC2k-1-SOC2k
In formula, j, k are natural number, j=2k-1,1≤j≤N, 1≤k≤[N/2].
Preferably, the I that the DOD interval division unit 202 is arranged is bigger, and section is more, the system evaluation energy storage electricity
The assessment result precision of pond SOH is higher.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (10)
1. a kind of method for assessing energy-storage battery health status, which is characterized in that the described method includes:
Data in step 1, calling energy-storage battery test database, numerical fitting form energy-storage system depth of discharge DOD and exist
The curve SOH of the energy-storage battery health status SOH and cycle-index relationship n on I section dividedi=f (n, DODi), it is right
In i-th of section DOD, SOHiTake DODiFor the test data matched curve of the first setting value, wherein the SOH is remaining battery
Active volume and the stylish battery that puts into operation just begin the ratio of discharge capacity, I is natural number, 1≤i≤I；
Step 2, for SOC=g (t) line under energy storage complexity operating condition, to be at the time of g ' (t)=0 and g " (t)≤0
Begin the moment, at the time of analyzing g ' (t)=0, forms time series tj, 1≤j≤N；
Step 3, according to SOC=g (t) curve, calculate time series tjCorresponding SOC sequence SOCj；
Step 4, according to SOC sequence SOCjForm DOD sequence D ODk, wherein j, k are natural number, 1≤j≤N, 1≤k≤[N/2]；
Step 5, according to DODkThe SOH and cycle-index curve in the place section DOD calculate SOH when cycle-index is 1k, enable k=
1；
Step 6, according to DODk+1The SOH and cycle-index curve in the place section DOD, calculate SOHkCorresponding charge and discharge cycles number
nk, calculate nkSOH after+1 effectk+1, k=k+1 is enabled, step 6 is repeated and goes to step 7 as k+1=[N/2]；
Step 7, as k+1=[N/2], DOD is calculated[N/2]SOH after effect[N/2]Value, the SOH[N/2]Value is the work
Energy-storage battery health status value after the effect of condition curve.
2. the method according to claim 1, wherein described form energy-storage system depth of discharge in numerical fitting
DOD is before the curve of energy-storage battery health status SOH and cycle-index relationship n on the I section divided further include:
Establish energy-storage battery test database, when including different DOD in the database, the health status SOH of energy-storage battery with
The data of cycle-index relationship n；
The value of DOD is divided into I section, wherein in i-th of section DOD, DODiValue range be (i-1/I, i/I], I is
Natural number, 1≤i≤I.
3. according to claim 1 or claim 2, which is characterized in that described for i-th of section DOD, SOHiTake DODi
Refer to for the test data matched curve of the first setting value for i-th of section DOD, SOHiTake DODiFor the test of (i-0.5)/I
Data matched curve, is denoted as:
4. according to the method described in claim 3, it is characterized in that, described according to SOC sequence SOCjForm DOD sequence D ODk,
Calculation formula are as follows:
DODk=SOCj-SOCj+1=SOC2k-1-SOC2k
In formula, j, k be natural number, j=2k-1,1≤j≤N, 1≤k≤[N/2].
5. the method according to claim 1, wherein the method assessment energy-storage battery SOH precision with
The interval number that DOD is divided is related, and I is bigger, and section is more, and the assessment result precision of energy-storage battery SOH is higher.
6. a kind of system for assessing energy-storage battery health status, which is characterized in that the system comprises:
SOH curve determining unit is used to call the data in energy-storage battery test database, and numerical fitting forms energy-storage system
The curve of depth of discharge DOD the energy-storage battery health status SOH on the I section divided and cycle-index relationship n
SOHi=f (n, DODi), for i-th of section DOD, SOHiTake DODiFor the test data matched curve of the first setting value,
In, the SOH is the ratio for the discharge capacity that begins at the beginning of the active volume of remaining battery and the stylish battery that puts into operation, and I is natural number, 1≤i
≤I；
Time series determination unit is used for for SOC=g (t) line under energy storage complexity operating condition, with g ' (t)=0 and g "
(t)≤0 it is initial time at the time of, at the time of analyzing g ' (t)=0, forms time series tj, 1≤j≤N；
SOC sequence determination unit is used to calculate time series t according to SOC=g (t) curvejCorresponding SOC sequence SOCj；
DOD sequence determination unit is used for according to SOC sequence SOCjForm DOD sequence D ODk, wherein j, k are natural number, 1≤j
≤ N, 1≤k≤[N/2]；
Initial SOH determination unit, is used for according to DODkThe SOH and cycle-index curve in the place section DOD, calculate cycle-index
SOH when being 1k, enable k=1；
SOH cycle calculations unit, is used for according to DODk+1The SOH and cycle-index curve in the place section DOD, calculate SOHkIt is corresponding
Charge and discharge cycles frequency nk, calculate nkSOH after+1 effectk+1, k=k+1 is enabled, SOH cycle calculations unit carries out cycle calculations,
As k+1=[N/2], SOH determination unit is gone to；
SOH determination unit is used to that DOD to be calculated as k+1=[N/2][N/2]SOH after effect[N/2]Value, it is described
SOH[N/2]Value is the energy-storage battery health status value after performance curve effect.
7. system according to claim 6, which is characterized in that the system also includes:
Database Unit is used to establish energy-storage battery test database, when including different DOD in the database, energy storage electricity
The data of the health status SOH and cycle-index relationship n in pond；
DOD interval division unit is used to the value of DOD dividing I section, wherein in i-th of section DOD, DODiTake
Be worth range be (i-1/I, i/I], I is natural number, 1≤i≤I.
8. according to system described in claim 6 or 7, which is characterized in that in the SOH curve determining unit, SOHiTake DODi
For the generation test data matched curve of (i-0.5)/I, it is denoted as:
9. system according to claim 8, which is characterized in that the DOD sequence determination unit is according to SOC sequence SOCjShape
At DOD sequence D ODk, its calculation formula is:
DODk=SOCj-SOCj+1=SOC2k-1-SOC2k
In formula, j, k are natural number, j=2k-1,1≤j≤N, 1≤k≤[N/2].
10. system according to claim 7, which is characterized in that the I of the DOD interval division unit setting is bigger, section
More, the assessment result precision of the system evaluation energy-storage battery SOH is higher.
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| CN111740481A (en) * | 2020-08-19 | 2020-10-02 | 江苏慧智能源工程技术创新研究院有限公司 | Energy storage system EMS charging control method |
| CN112379291A (en) * | 2020-09-29 | 2021-02-19 | 浙江南都电源动力股份有限公司 | SOC estimation method and system of lithium battery system |
| US20210148981A1 (en) * | 2019-04-25 | 2021-05-20 | Contemporary Amperex Technology Co., Limited | Method and apparatus for determining available energy of battery, management system, and storage medium |
| CN113176511A (en) * | 2021-02-10 | 2021-07-27 | 合肥工业大学 | Energy storage charging and discharging optimization method and system considering health state |
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