CN106443461A - Battery energy storage system state assessment method - Google Patents
Battery energy storage system state assessment method Download PDFInfo
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- CN106443461A CN106443461A CN201610806805.4A CN201610806805A CN106443461A CN 106443461 A CN106443461 A CN 106443461A CN 201610806805 A CN201610806805 A CN 201610806805A CN 106443461 A CN106443461 A CN 106443461A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
Abstract
A battery energy storage system state assessment method comprises steps of obtaining operation data of a to-be-assessed battery energy storage system, and performing calculation to obtain real-time radiation conditions of charging state consistency of the to-be-assessed battery energy storage system according to the operation data; obtaining test working condition data of the to-be-assessed battery energy storage system according to a preset period, performing calculation to obtain residual capacity, peak power, polarization voltage, open-circuit voltage, temperature rise performance and charging state estimation condition of the to-be-assessed battery energy storage system according to the test working condition data, and obtaining the decline condition of the to-be-assessed battery energy storage system according to the residual capacity, the peak power, the polarization voltage, the open-circuit voltage, the temperature rise performance and the charging state estimation condition; and obtaining an assessment result of the to-be-assessed battery energy storage system according to the real-time radiation conditions of charging state consistency of the to-be-assessed battery energy storage system and the decline condition of the to-be-assessed battery energy storage system.
Description
Technical field
The present invention relates to power test field, espespecially a kind of battery energy storage system state evaluating method.
Background technology
As a big branch of high-efficiency environment friendly in current energy source field, electric energy is widely made in all trades and professions
With in electric automobile field, when battery capacity drops to below 80% it is generally recognized that being no longer appropriate for continuing on electric automobile
Continuous use, if directly eliminated battery, can cause the waste of resource.The echelon of electrokinetic cell using be reduce battery totle drilling cost
Effective means, following flourishing with new-energy automobile, estimate the available secondary cell amount of the year two thousand thirty only China up to
To 50GWh.
For the energy-storage system of electrical network occasion, its use condition is relatively gentleer, relatively low to battery performance requirements, can be real
The echelon of existing electrokinetic cell utilizes.But the driving cycle of electric automobile, maintenance situation difference are larger, retired after battery performance ginseng
Difference uneven, battery from electric automobile retired to stored energy application, be also faced with a lot of technical problems.
It is the integrated energy-accumulating power station of new battery in the energy-accumulating power station of operation, its operation maintenance technology is still immature, battery
The Changing Pattern of performance parameter still unintelligible it is impossible to fully according to laboratory characteristic operating mode life curve formulate O＆M maintenance plan
Slightly；And newly the operational factor of battery is generally individually empirically given by cell production companies；Security requirement is more prominent, newly electricity
Typically through security test, there is the probability very little of safety issue in single battery, but echelon will be moved back using energy-storage system in pond
Fortune battery reconfigures, and a combination thereof performance is still to be tested；Echelon there is no the standard can be according to using battery energy storage.
Content of the invention
Present invention aim at providing a kind of battery energy storage system state evaluating method, for evaluating the echelon of energy-storage system
Utility.
For reaching above-mentioned purpose, battery energy storage system state evaluating method provided by the present invention specifically comprises：Obtain to be evaluated
Estimate the service data of battery energy storage system, calculated according to described service data and obtain the charged of described battery energy storage system to be assessed
The real-time transmitting case of state consistency；Obtain the operating condition of test data of described battery energy storage system to be assessed by predetermined period,
Calculated according to described operating condition of test data and obtain the residual capacity of described battery energy storage system to be assessed, peak power, polarization electricity
Pressure, open-circuit voltage, temperature rise model and state-of-charge estimation situation, according to described residual capacity, described peak power, described polarization
Voltage, described open-circuit voltage, described temperature rise model and described state-of-charge estimation situation obtain described battery energy storage system to be assessed
The decline situation of system；The conforming real-time transmitting case of state-of-charge according to described battery energy storage system to be assessed and described treat
The decline situation of assessment battery energy storage system obtains the assessment result of battery energy storage system to be assessed.
It is preferred that described calculating according to described service data obtains in above-mentioned battery energy storage system state evaluating method
The conforming real-time transmitting case of state-of-charge of described battery energy storage system to be assessed comprises：Calculated according to described service data
Obtain voltage extreme difference, Temperature Distribution and the cell voltage standard deviation of described battery energy storage system to be assessed, according to described voltage pole
Poor, described Temperature Distribution and the state-of-charge concordance of the described cell voltage standard deviation described battery energy storage system to be assessed of acquisition
Real-time transmitting case.
It is preferred that described calculate according to described operating condition of test data in above-mentioned battery energy storage system state evaluating method
The residual capacity obtaining described battery energy storage system to be assessed comprises：Calculated by below equation according to described operating condition of test data
Obtain the residual capacity of described battery energy storage system to be assessed：
In above formula, SgFor the residual capacity of battery energy storage system to be assessed, %；ENorFor battery energy storage system to be assessed
Nominal electric energy, electricity Wh；ETestFor the discharge energy of battery energy storage system to be assessed, electricity Wh.
In above-mentioned battery energy storage system state evaluating method it is preferred that described by predetermined period test described to be assessed
Battery energy storage system comprises：Every three months once tests described battery energy storage system to be assessed.
It is preferred that described calculate according to described operating condition of test data in above-mentioned battery energy storage system state evaluating method
The open-circuit voltage obtaining described battery energy storage system to be assessed comprises：Calculated by below equation according to described operating condition of test data
Obtain the open-circuit voltage of described battery energy storage system to be assessed：
In above formula, V1For for the first time under the conditions of 25 (± 5) DEG C, with rated current charge to 100% state-of-charge or on
It is limited to by condition, the open-circuit voltage after static 1 hour；V2For second under the conditions of 25 (± 5) DEG C, charged with rated current
It is by condition to 100% state-of-charge or the upper limit, the open-circuit voltage after static 1 hour；V3For third time in 25 (± 5) DEG C bar
Under part, charging to 100% state-of-charge or the upper limit with rated current is by condition, the open-circuit voltage after static 1 hour；Vocv
Open-circuit voltage for described battery energy storage system to be assessed.
It is preferred that described calculate according to described operating condition of test data in above-mentioned battery energy storage system state evaluating method
The peak power obtaining described battery energy storage system to be assessed comprises：Calculated by below equation according to described operating condition of test data
Obtain the peak power of described battery energy storage system to be assessed：
In above formula, Wp1For being electric current, the test electricity applying change at 85% for the first time in the SOC (state-of-charge) of battery
The internal resistance in pond the electric current according to applying, are calculated the peak power of battery；Wp2It is 85% for second SOC in battery
Place, applies electric current, the internal resistance of test battery the electric current according to applying of change, is calculated the peak power of battery；Wp3For
Third time is to apply the electric current of change at 85%, test the internal resistance of battery and according to the electric current applying in the SOC of battery, calculates
Obtain the peak power of battery；WpIt is peak power at 85% for described battery energy storage system to be assessed in the SOC of battery.
It is preferred that described calculate according to described operating condition of test data in above-mentioned battery energy storage system state evaluating method
The polarizing voltage obtaining described battery energy storage system to be assessed comprises：Calculated by below equation according to described operating condition of test data
Obtain the polarizing voltage of described battery energy storage system to be assessed：
In above formula, Up1For, for the first time at 30%SOC point, to stop electric discharge after the current discharge 18s of 1/3C, record discharges
Terminate point voltage and stand voltage after 10min, be calculated the polarizing voltage of battery；Up2For second at 30%SOC point, with
Stop after the current discharge 18s of 1/3C discharging, record electric discharge terminates point voltage and stands voltage after 10min, is calculated battery
Polarizing voltage；Up3For third time at 30%SOC point, to stop electric discharge after the current discharge 18s of 1/3C, record electric discharge terminates
Voltage after point voltage and standing 10min, is calculated the polarizing voltage of battery；UpPole for described battery energy storage system to be assessed
Change voltage.
It is preferred that described calculate according to described operating condition of test data in above-mentioned battery energy storage system state evaluating method
The temperature rise model obtaining described battery energy storage system to be assessed comprises：Described temperature rise model comprises discharge temperature rise and charging temperature rise；
The electric discharge obtaining described battery energy storage system to be assessed is calculated according to described operating condition of test data by below equation
Temperature rise：
ΔTdis=Tdis,e-Tdis,s；
Wherein, Δ TdisFor the electric discharge temperature rise of battery energy storage system to be assessed, Tdis,eTemperature when ending for battery discharge,
Tdis,sFor temperature when initial for the battery；
The charging obtaining described battery energy storage system to be assessed is calculated according to described operating condition of test data by below equation
Temperature rise：
ΔTch=Tch,e-Tch,s
Wherein Δ TchFor the charging temperature rise of battery energy storage system to be assessed, Tch,eFor temperature during battery charge cutoff,
Tch,sFor temperature when initial for the battery.
In above-mentioned battery energy storage system state evaluating method it is preferred that described by predetermined period obtain described to be assessed
The operating condition of test packet of battery energy storage system contains：Described battery energy storage system to be assessed is carried out with working condition tests, every 100 times
An operating condition of test data is obtained after working condition tests.
It is preferred that described state-of-charge estimation situation comprises in above-mentioned battery energy storage system state evaluating method：By pre-
When fixed cycle tests described battery energy storage system to be assessed, the survey testing initial value and described state-of-charge of described state-of-charge
Difference between examination stop value.
The present invention passes through to study echelon using batteries of electric automobile characteristic, in conjunction with the debugging of wind-light storage Demonstration Station energy-storage system
Operating experience, with operational monitoring data and operating condition of test as data source it is proposed that one kind is suitable for echelon utilizes battery energy storage electricity
The state evaluating method stood, this appraisal procedure is based on service data, and real-time assessment energy-accumulating power station concordance degree of divergence, based on examination
Test floor data, comprehensive assessment echelon utilizes battery energy storage power station performance degradation degree, from battery life, aging, concordance angle
Degree proposes the index of six kinds of assessment energy-storage units health status, and given computational methods, threshold value, assessment cycle.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, not
Constitute limitation of the invention.In the accompanying drawings：
Fig. 1 is the schematic flow sheet of battery energy storage system state evaluating method provided by the present invention；
Fig. 2 is the state-of-charge estimation situation test typical condition curve synoptic diagram of offer of the present invention.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention become more apparent, with reference to embodiment and attached
Figure, is described in further details to the present invention.Here, the schematic description and description of the present invention is used for explaining the present invention,
But it is not as a limitation of the invention.
Refer to shown in Fig. 1, battery energy storage system state evaluating method provided by the present invention specifically comprises：S101 obtains
The service data of battery energy storage system to be assessed, calculates according to described service data and obtains described battery energy storage system to be assessed
The conforming real-time transmitting case of state-of-charge；S102 presses the test work that predetermined period obtains described battery energy storage system to be assessed
Condition data, calculated according to described operating condition of test data obtain the residual capacity of described battery energy storage system to be assessed, peak power,
Polarizing voltage, open-circuit voltage, temperature rise model and state-of-charge estimation situation, according to described residual capacity, described peak power, institute
State polarizing voltage, described open-circuit voltage, described temperature rise model and described state-of-charge estimation situation and obtain described battery to be assessed
The decline situation of energy-storage system；S103 dissipates feelings in real time according to the state-of-charge of described battery energy storage system to be assessed is conforming
The decline situation of condition and described battery energy storage system to be assessed obtains the assessment result of battery energy storage system to be assessed.
Wherein, described operating condition of test packet pass obtained in process of the test containing described battery energy storage system to be assessed
In relevant parameter numbers such as residual capacity, peak power, polarizing voltage, open-circuit voltage, temperature rise model and state-of-charge estimation situations
According to here of the present invention will not enumerate.
In the present invention one preferred embodiment, it is described to be evaluated that above-mentioned steps S101 calculate acquisition according to described service data
The conforming real-time transmitting case of state-of-charge estimating battery energy storage system also comprises：Calculated according to described service data and obtain institute
State voltage extreme difference, Temperature Distribution and the cell voltage standard deviation of battery energy storage system to be assessed, according to described voltage extreme difference, described
The state-of-charge of Temperature Distribution and the described cell voltage standard deviation described battery energy storage system to be assessed of acquisition is conforming in real time
Transmitting case.
State estimation index based on service data can be by monitoring data analysis in real time it is also possible to regular derivation be run
Data analysiss；Due to the restriction of operating condition, this part index number is mainly the coherency state assessing energy-storage system, wherein above-mentioned
Voltage extreme difference, Temperature Distribution and cell voltage standard deviation obtain especially by below equation：
(1) voltage extreme difference
Voltage is energy-accumulating power station monitoring variable the most intensive, and the terminal voltage of each battery cell uploads, therefore in real time
It is the variable being easiest to obtain.According to the Preservation tactics of energy-accumulating power station, each energy-storage units is in operation, as long as there being a monomer
Voltage exceeds working range, and whole group energy-storage units should quit work, and therefore, the concordance of voltage directly affects energy-accumulating power station
Availability, therefore voltage concordance are the key indexs of assessment energy-storage lithium battery health status.
Set of cells string stands voltage extreme difference
ΔVmax=Vmax-Vmin(1)
In formula, VmaxWith VminFor being under same energy accumulation current converter, battery in battery pack monomer is after 1 hour of standing
The maximum of voltage and voltage minimum.
(2) Temperature Distribution
The chemical reaction of lithium battery is closely related with temperature, when temperature is different, the capacity attenuation of resistance, internal resistance change etc.
Will be different, therefore temperature consistency is the key index of assessment energy-storage lithium battery health status.
Set of cells string temperature extreme difference
ΔTmax=Tmax-Tmin(2)
In formula, Δ TmaxIt is under same energy accumulation current converter, battery in battery pack monomer is once completely filling (putting) electric process
In, the difference of maximum temperature and minimum temperature.
(3) the cell voltage standard deviation of set of cells string
Reflect the mathematical criterion of similar parameter discrete degree in a large number from relative angle.Because lithium battery group string is by a large amount of electricity
Pond connection in series-parallel composition, therefore can be by analyzing the coefficient of standard deviation of the technical parameters such as cell voltage, capacity, internal resistance, to battery
The trim situation of group string is estimated.Compared with cell voltage extreme difference, cell voltage coefficient of standard deviation can more intuitive reflection group
Become the cell voltage concordance of set of cells string, cell voltage standard deviation calculates as shown in Equation 1.
In formula：uδCell voltage coefficient of standard deviation；
δuCell voltage standard deviation；
Set of cells string cell voltage meansigma methodss；
uiI-th cell voltage；
N set of cells string battery number of elements.
(4) SOC coincident indicator
Set of cells string SOC extreme difference is the evaluation index judging energy coincidence between set of cells string in running, SOC pole
Difference is less, and the energy coincidence of set of cells string is better, and energy-storage units active volume is bigger, and SOC extreme difference is bigger, set of cells string energy
Concordance is poorer, and energy-storage units active volume is less.
In real work, when using, its performance is affected electrokinetic cell by many factors such as temperature, capacity, power,
The capacity of battery refers to the electricity that battery can be provided by under certain discharging condition, and power-performance directly reflects battery and provides wink
When power ability；Therefore there is certain limitation only according to the health status of the Capacity Assessment set of cells of battery, concordance
Property, as higher in battery capacity, now it is believed that cell health state is good；But its power-performance is very low, the electric current of set of cells
Ability to accept is relatively low it is believed that the health status of set of cells are poor, and so same set of cells occurs in that antipodal SOH assessment
Result is not it is clear that meet scientific theory；In addition the internal resistance of battery, polarization and battery temperature rise etc. also to the screening of battery, join
Group and cell health state have very important impact, according to the assessment to battery performance and parameter, present invention determine that impact
6 important indicators of battery performance, specifically comprise capacity, peak power, polarizing voltage, open-circuit voltage, electric discharge temperature rise and charging
Temperature rise, this 6 indexs constitute the index system of Cell Performance Evaluation.
Consider actual capacity, peak power, polarizing voltage, open-circuit voltage, electric discharge temperature rise and the temperature that charges of set of cells
Rise six parameters evaluating consistency of battery pack and set of cells SOH, in order to embody the coherency state of energy-storage units, increase dynamic
Coincident indicator, that is, in order to assess EMS state-of-charge estimation situation, increases state-of-charge estimation situation test, altogether
7 indexs, the definition of index and computational methods, evaluation cycle and threshold value are as follows：
In the preferred embodiment of the present invention, energy-storage units performance indications recommend the reality using energy-storage battery Experimental Calibration
Border capacity performance index, reflects the currently practical capacity of energy-storage battery, described in the therefore described calculating acquisition according to described operating condition of test data
The residual capacity of battery energy storage system to be assessed comprises：According to described operating condition of test data is calculated by below equation and obtains
The residual capacity of battery energy storage system to be assessed：
In above formula, SgResidual capacity for battery energy storage system to be assessed is energy-storage battery Experimental Calibration in real work
Actual capacity index, %；ENorFor the nominal electric energy of battery energy storage system to be assessed, electricity Wh；ETestIt is to fill in rated power
Under discharging condition, the discharge energy of battery energy storage system to be assessed, electricity Wh.
Wherein, ETestIt is calculated by formula (2).
In above-mentioned formula, the agent object of assessment is energy-storage units (being made up of an energy accumulation current converter and its battery pile), real
The E during test of border1、E2、E3Method of testing is as follows respectively：
A) under the conditions of 25 (± 5) DEG C, charged with rated power, stop charging to during rated power charging termination condition,
Hot stand-by duty runs 15 minutes；
B) discharged with rated power, stop electric discharge to during rated power discharge off condition, record discharge energy E1, hot standby
Run 15 minutes with state；
C) repeat a)～b) twice, record discharge energy is E respectively2、E3.
In real work, staff, after above-mentioned formula obtains residual capacity, is being compared with predetermined threshold, is entering
One step obtains the residual capacity grade of described battery energy storage system to be assessed, is 80% to move back residual capacity index during fortune below
As a example the energy-storage units of set of cells composition, by table 1, this predetermined threshold is illustrated：
Table 1
| Put into operation the time limit | Residual capacity index Sg |
| First Year | More than 75% |
| Second Year | More than 60% |
| 3rd year | More than 55% |
| 4th year | More than 50% |
| 5th year | More than 40% |
By above-mentioned table 1, such as battery energy storage system to be assessed puts into operation and is limited in year the 3rd year, and residual capacity is more than hundred
If/55, then functional, on the contrary then poor, every three months can be taken in real work to carry out once battery storage to be assessed
Can system measurement with compare, the even running of battery energy storage system to be assessed is ensured with this；Certainly above-mentioned threshold value needs basis
Onsite application operating mode, cell decay degree and the horizontal real-time adjustment of O＆M, here by way of example only, the present invention is not done into
One step limits.
In the preferred embodiment of the present invention, 100%SOC or the upper limit are charged to by condition with rated current, static 1
Open-circuit voltage V after hourocvAs a example, described calculating according to described operating condition of test data obtains described battery energy storage system to be assessed
The open-circuit voltage of system comprises：Calculated by below equation according to described operating condition of test data and obtain described battery energy storage system to be assessed
The open-circuit voltage of system：
In above formula, V1For for the first time under the conditions of 25 (± 5) DEG C, with rated current charge to 100% state-of-charge or on
It is limited to by condition, after static 1 hour, the open-circuit voltage of record；V2For second under the conditions of 25 (± 5) DEG C, with specified electricity
Current charge is by condition to 100% state-of-charge or the upper limit, after static 1 hour, the open-circuit voltage of record；V3Exist for third time
Under the conditions of 25 (± 5) DEG C, charging to 100% state-of-charge or the upper limit with rated current is by condition, after static 1 hour, note
The open-circuit voltage of record；VocvOpen-circuit voltage for described battery energy storage system to be assessed.
In above-mentioned formula, the agent object of assessment is energy-storage units (being made up of an energy accumulation current converter and its battery pile), real
The V during test of border1、V2、V3Method of testing is as follows respectively：
A) under the conditions of 25 (± 5) DEG C, 100%SOC or the upper limit are charged to by condition with rated current；
B), after static 1 hour, record open-circuit voltage V1；
C) repeat a)～b) twice, record discharge energy is V respectively2、V3.
In real work, staff, after above-mentioned formula obtains open-circuit voltage, is being compared with predetermined threshold, is entering
One step obtains the open-circuit voltage grade of described battery energy storage system to be assessed, below to move back during fortune open-circuit cell index for 100%
As a example the energy-storage units of set of cells composition of (ideal value), by table 2, this predetermined threshold is illustrated：
Table 2
| Put into operation the time limit | OCV |
| First Year | More than 99% |
| Second Year | More than 98% |
| 3rd year | More than 97% |
| 4th year | More than 95% |
| 5th year | More than 92% |
By above-mentioned table 1, such as battery energy storage system to be assessed puts into operation and is limited in year the 3rd year, and open-circuit voltage is more than hundred
If/97, then functional, on the contrary then poor, can take in real work and described battery energy storage system to be assessed is carried out
Working condition tests are open-circuit voltage experiment, and every working condition tests obtain an operating condition of test data 100 times afterwards, are ensured to be assessed with this
The operating condition of test data stabilization of battery energy storage system is effective；Certainly above-mentioned threshold value needs according to onsite application operating mode, cell decay
Degree and the horizontal real-time adjustment of O＆M, here by way of example only, is not done to the present invention and is limited further.
In the present invention one preferred embodiment, it is the testing current battery applying change at 85% in the SOC of battery
(voltage, the sampling time interval of electric current are 0.01s, and initial current is generally 1/5C, and the electric current after change is chosen as 1/ for internal resistance
3C), obtain thereafter peak power further, specifically as follows：
R=Δ V ÷ Δ I (7)
Wherein Δ V, Δ I are the change of voltage and current in battery.Do not consider the voltage V of internal resistance impactIRFreeFor
VIRFree=UOCV-IR (8)
Wherein UocvFor the open-circuit voltage of this SOC point of battery, I is the current value after change.Its peak work of this SOC point battery
Rate WpFor：
Wp=Vl×(VIRFree-Vl)÷R (9)
Peak power is calculated by formula (7)
In above formula, for ensureing the accuracy of peak power test, optional peak power is in acquisition institute under steady statue
(SOC choosing described battery energy storage system to be assessed is in when 85% to state the peak power of battery energy storage system to be assessed
Peak power), Wp1For being for the first time to apply the electric current of change, the internal resistance of test battery according to applying at 85% in the SOC of battery
Plus electric current, be calculated the peak power of battery；Wp2It is at 85% for second SOC in battery, the electric current of applying change,
The internal resistance of test battery the electric current according to applying, are calculated the peak power of battery；Wp3For third time in the SOC of battery it is
At 85%, apply electric current, the internal resistance of test battery the electric current according to applying of change, be calculated the peak power of battery；
WpIt is peak power at 85% for described battery energy storage system to be assessed in the SOC of battery.
In above-mentioned formula, the agent object of assessment is energy-storage units (being made up of an energy accumulation current converter and its battery pile), real
The W during test of borderp1、Wp2、Wp3Method of testing is as follows respectively：
A) SOC in battery is to apply the electric current of change at 85%, test the internal resistance of battery (when voltage, the sampling of electric current
Between be spaced apart 0.01s, initial current is generally 1/5C, and the electric current after change is chosen as 1/3C)；
B) test the U of batteryocv, according to the electric current applying, it is calculated peak power W of batteryp1；
C) repeat a)～b) twice, it is calculated peak power W of battery respectivelyp2、Wp3.
In real work, staff, after above-mentioned formula obtains peak power, is being compared with predetermined threshold, is entering
One step obtains the peak power class of described battery energy storage system to be assessed, to move back battery peak power index during fortune is below
As a example the energy-storage units of set of cells composition of 100% (ideal value), by table 3, this predetermined threshold is illustrated：
Table 3
By above-mentioned table 3, such as battery energy storage system to be assessed puts into operation and is limited in year the 3rd year, and open-circuit voltage is more than hundred
If/92, then functional, on the contrary then poor, can take in real work and described battery energy storage system to be assessed is carried out
Working condition tests are peak power experiment, and every working condition tests obtain an operating condition of test data 100 times afterwards, are ensured to be assessed with this
The operating condition of test data stabilization of battery energy storage system is effective；Certainly above-mentioned threshold value needs according to onsite application operating mode, cell decay
Degree and the horizontal real-time adjustment of O＆M, here by way of example only, is not done to the present invention and is limited further.
In the preferred embodiment of the present invention, with 30%SOC point, to stop after the current discharge 18s of 1/3C putting
Electricity, electric discharge terminate point voltage with standing 10min after voltage difference as a example, therefore described according to described operating condition of test data calculate
The polarizing voltage obtaining described battery energy storage system to be assessed comprises：Calculated by below equation according to described operating condition of test data
Obtain the polarizing voltage of described battery energy storage system to be assessed：
Up=V18s-V10min(11)
Wherein V18sFor voltage during battery discharge 18s, V10minFor the voltage after battery standing 10min.
Polarizing voltage is calculated by formula (9)
In above formula, for ensureing the accuracy of polarizing voltage test, optional polarizing voltage is in acquisition institute under steady statue
(SOC choosing described battery energy storage system to be assessed is in when 30% to state the polarizing voltage of battery energy storage system to be assessed
Polarizing voltage), Up1For, for the first time at 30%SOC point, to stop electric discharge after the current discharge 18s of 1/3C, record electric discharge terminates
Voltage after point voltage and standing 10min, is calculated the polarizing voltage of battery；Up2For second at 30%SOC point, with 1/3C
Current discharge 18s after stop electric discharge, record electric discharge terminate point voltage with standing 10min after voltage, be calculated the pole of battery
Change voltage；Up3For third time at 30%SOC point, to stop electric discharge, record electric discharge end point electricity after the current discharge 18s of 1/3C
Voltage after pressure and standing 10min, is calculated the polarizing voltage of battery；UpPolarization electricity for described battery energy storage system to be assessed
Pressure.
In above-mentioned formula, the agent object of assessment is energy-storage units (being made up of an energy accumulation current converter and its battery pile), real
The U during test of borderp1、Up2、Up3Method of testing is as follows respectively：
A) at 30%SOC point, to stop electric discharge after the current discharge 18s of 1/3C；
B) recording playback electricity terminates point voltage and stands voltage after 10min, is calculated polarizing voltage U of batteryp1；
C) repeat a)～b) twice, it is calculated polarizing voltage U of battery respectivelyp2、Up3
In real work, staff, after above-mentioned formula obtains polarizing voltage, is being compared with predetermined threshold, is entering
One step obtains the residual polarization voltage of described battery energy storage system to be assessed, to move back battery peak power index during fortune is below
As a example the energy-storage units of set of cells composition of 100% (ideal value), by table 4, this predetermined threshold is illustrated：
Table 4
| Put into operation the time limit | Polarizing voltage index |
| First Year | More than 102% |
| Second Year | More than 105% |
| 3rd year | More than 108% |
| 4th year | More than 111% |
| 5th year | More than 115% |
By above-mentioned table 4, such as battery energy storage system to be assessed puts into operation and is limited in year the 3rd year, and residual capacity is more than hundred
If/108, then functional, on the contrary then poor, can take in real work and described battery energy storage system to be assessed is entered
Row working condition tests are polarizing voltage experiment, and every working condition tests obtain an operating condition of test data 100 times afterwards, are ensured to be evaluated with this
The operating condition of test data stabilization estimating battery energy storage system is effective；Certainly above-mentioned threshold value needs to be declined according to onsite application operating mode, battery
Subtract degree and the horizontal real-time adjustment of O＆M, here by way of example only, is not done to the present invention and limited further.
In the preferred embodiment of the present invention, described calculating according to described operating condition of test data obtains described electricity to be assessed
The temperature rise model of pond energy-storage system comprises：Described temperature rise model comprises discharge temperature rise and charging temperature rise；
Wherein discharge temperature rise (Δ Tdis)：During the current discharge of 1/3C to blanking voltage, the temperature that inside battery raises
Degree；
ΔTdis=Tdis,e-Tdis,s(13)
Wherein Tdis,eTemperature when ending for battery discharge, Tdis,sFor temperature when initial for the battery.
Charging temperature rise (Δ Tch)：During blanking voltage is charged to the electric current of 1/3C, the temperature that inside battery raises.
ΔTch=TCh, e-Tch,s(15)
Wherein TCh, eFor temperature during battery charge cutoff, TCh, sFor temperature when initial for the battery.
In above-mentioned formula, the agent object of assessment is energy-storage units (being made up of an energy accumulation current converter and its battery pile), real
Δ T during the test of borderdis1、ΔTch1、ΔTdis2、ΔTch2、ΔTdis3、ΔTch3Method of testing is as follows respectively：
A) during with the current discharge of 1/3C to blanking voltage, the temperature that inside battery raises, the record temperature difference is Δ
Tdis1；
B) during blanking voltage being charged to the electric current of 1/3C, the temperature that inside battery raises, the record temperature difference is Δ
Tch1；
C) repeat a)～b) twice, it is calculated the polarizing voltage Δ T of battery respectivelydis2、ΔTch2、ΔTdis3、ΔTch3.
In real work, staff, after above-mentioned formula obtains temperature rise model, is being compared with predetermined threshold, is entering
One step obtains the remaining temperature rise model of described battery energy storage system to be assessed, to move back battery peak power index during fortune is below
As a example the energy-storage units of set of cells composition of 100% (ideal value), by table 5, this predetermined threshold is illustrated：
Table 5
| Put into operation the time limit | Temperature rise model index |
| First Year | More than 101% |
| Second Year | More than 103% |
| 3rd year | More than 105% |
| 4th year | More than 108% |
| 5th year | More than 112% |
By above-mentioned table 5, such as battery energy storage system to be assessed puts into operation and is limited in year the 3rd year, and residual capacity is more than hundred
If/105, then functional, on the contrary then poor, can take in real work and described battery energy storage system to be assessed is entered
Row working condition tests are temperature rise model experiment, and every working condition tests obtain an operating condition of test data 100 times afterwards, are ensured to be evaluated with this
The operating condition of test data stabilization estimating battery energy storage system is effective；Certainly above-mentioned threshold value needs to be declined according to onsite application operating mode, battery
Subtract degree and the horizontal real-time adjustment of O＆M, here by way of example only, is not done to the present invention and limited further.
In the present invention one preferred embodiment, described state-of-charge estimation situation comprises：Described by predetermined period test
During battery energy storage system to be assessed, between the test initial value of described state-of-charge and the end of test value of described state-of-charge
Difference；In real work, this predetermined period is for calculating minimum unit, generally energy storage using state-of-charge after the typical condition cycle
Each batteries in parallel connection group under unit.
Echelon is generally operated at gentle operating mode and SOC centre portion using battery, for being more clearly explained above-described embodiment, with
Under taking flat volatility as a example as a example, by table 6, this predetermined threshold is illustrated：
Table 6
Simplify upper table, can obtain show current amplitude typical condition should comprise following information：
The design operating mode of 1 hour, circulation typical condition 2 times, complete discharge and recharge once within 30 minutes, its curve chart such as Fig. 2 institute
Show, situation shown in situation test typical condition curve chart is estimated according to the state-of-charge that Fig. 2 is provided, carries out with predetermined threshold
Relatively can learn that state-of-charge estimates the grade of situation, such as when the starting point deviation that state-of-charge estimates situation is less than percentage
2 when, then functional, on the contrary then poor, each year can be taken in real work to carry out once battery energy storage system to be assessed
Measurement with compare, the even running of battery energy storage system to be assessed is ensured with this；Certainly above-mentioned threshold value needs to be made according to scene
With operating mode, cell decay degree and the horizontal real-time adjustment of O＆M, here by way of example only, is not done to the present invention and is limited further
System.
The present invention passes through to study echelon using batteries of electric automobile characteristic, in conjunction with the debugging of wind-light storage Demonstration Station energy-storage system
Operating experience, with operational monitoring data and operating condition of test as data source it is proposed that one kind is suitable for echelon utilizes battery energy storage electricity
The state evaluating method stood, this appraisal procedure is based on service data, and real-time assessment energy-accumulating power station concordance degree of divergence, based on examination
Test floor data, comprehensive assessment echelon utilizes battery energy storage power station performance degradation degree, from battery life, aging, concordance angle
Degree proposes the index of six kinds of assessment energy-storage units health status, and given computational methods, threshold value, assessment cycle.
Particular embodiments described above, has carried out detailed further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail bright, be should be understood that the specific embodiment that the foregoing is only the present invention, the guarantor being not intended to limit the present invention
Shield scope, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done etc., should be included in this
Within the protection domain of invention.
Claims (10)
1. a kind of battery energy storage system state evaluating method, in echelon using battery energy storage system in evaluate the storage of described battery
Energy system is it is characterised in that methods described comprises：
Obtain the service data of battery energy storage system to be assessed, calculated according to described service data and obtain described battery storage to be assessed
The conforming real-time transmitting case of state-of-charge of energy system；
Obtain the operating condition of test data of described battery energy storage system to be assessed by predetermined period, according to described operating condition of test data meter
Calculate obtain the residual capacity of described battery energy storage system to be assessed, peak power, polarizing voltage, open-circuit voltage, temperature rise model and
State-of-charge estimates situation, according to described residual capacity, described peak power, described polarizing voltage, described open-circuit voltage, described
Temperature rise model and described state-of-charge estimate that situation obtains the decline situation of described battery energy storage system to be assessed；
The conforming real-time transmitting case of state-of-charge according to described battery energy storage system to be assessed and described battery to be assessed
The decline situation of energy-storage system obtains the assessment result of battery energy storage system to be assessed.
2. battery energy storage system state evaluating method according to claim 1 it is characterised in that described according to described operation
The conforming real-time transmitting case of state-of-charge that data calculates the described battery energy storage system to be assessed of acquisition comprises：According to described
Service data calculates voltage extreme difference, Temperature Distribution and the cell voltage standard deviation obtaining described battery energy storage system to be assessed, root
Obtain the lotus of described battery energy storage system to be assessed according to described voltage extreme difference, described Temperature Distribution and described cell voltage standard deviation
The conforming real-time transmitting case of electricity condition.
3. battery energy storage system state evaluating method according to claim 1 it is characterised in that described according to described test
The residual capacity that floor data calculates the described battery energy storage system to be assessed of acquisition comprises：
The residual capacity obtaining described battery energy storage system to be assessed is calculated according to described operating condition of test data by below equation：
In above formula, SgFor the residual capacity of battery energy storage system to be assessed, %；ENorNominal electricity for battery energy storage system to be assessed
Can, electricity Wh；ETestThe discharge energy of battery energy storage system to be assessed, electricity Wh.
4. battery energy storage system state evaluating method according to claim 3 it is characterised in that described by predetermined period survey
Try described battery energy storage system to be assessed to comprise：Every three months once tests described battery energy storage system to be assessed.
5. battery energy storage system state evaluating method according to claim 1 it is characterised in that described according to described test
The open-circuit voltage that floor data calculates the described battery energy storage system to be assessed of acquisition comprises：
The open-circuit voltage obtaining described battery energy storage system to be assessed is calculated according to described operating condition of test data by below equation：
In above formula, V1For for the first time under the conditions of 25 (± 5) DEG C, charging to 100% state-of-charge or the upper limit with rated current is section
To condition, the open-circuit voltage after static 1 hour；V2For second under the conditions of 25 (± 5) DEG C, charged to rated current
100% state-of-charge or the upper limit are by condition, the open-circuit voltage after static 1 hour；V3For third time in 25 (± 5) DEG C condition
Under, charging to 100% state-of-charge or the upper limit with rated current is by condition, the open-circuit voltage after static 1 hour；VocvFor
The open-circuit voltage of described battery energy storage system to be assessed.
6. battery energy storage system state evaluating method according to claim 1 it is characterised in that described according to described test
The peak power that floor data calculates the described battery energy storage system to be assessed of acquisition comprises：
The peak power obtaining described battery energy storage system to be assessed is calculated according to described operating condition of test data by below equation：
In above formula, Wp1For being electric current, the survey applying change at 85% for the first time in the SOC of described battery energy storage system to be assessed
The internal resistance of examination battery the electric current according to applying, are calculated the peak power of battery；Wp2For second in described electricity to be assessed
The SOC of pond energy-storage system is electric current, the internal resistance of test battery the electric current according to applying applying change at 85%, calculates
Peak power to battery；Wp3For third time described battery energy storage system to be assessed SOC be 85% at, apply change electricity
Stream, the internal resistance of test battery the electric current according to applying, are calculated the peak power of battery；WpStore up for described battery to be assessed
Energy system is in the peak power that the SOC of battery is at 85%.
7. battery energy storage system state evaluating method according to claim 1 it is characterised in that described according to described test
The polarizing voltage that floor data calculates the described battery energy storage system to be assessed of acquisition comprises：
The polarizing voltage obtaining described battery energy storage system to be assessed is calculated according to described operating condition of test data by below equation：
In above formula, Up1For first time at the 30%SOC point of described battery energy storage system to be assessed, with the current discharge of 1/3C
Stop after 18s discharging, record electric discharge terminates point voltage and stands voltage after 10min, is calculated the polarizing voltage of battery；Up2For
At the 30%SOC point of described battery energy storage system to be assessed, to stop electric discharge after the current discharge 18s of 1/3C, remember for second
Recording playback electricity terminates point voltage and stands voltage after 10min, is calculated the polarizing voltage of battery；Up3For third time described to be evaluated
Estimate at the 30%SOC point of battery energy storage system, to stop electric discharge after the current discharge 18s of 1/3C, record electric discharge terminates point voltage
With voltage after standing 10min, it is calculated the polarizing voltage of battery；UpPolarization electricity for described battery energy storage system to be assessed
Pressure.
8. battery energy storage system state evaluating method according to claim 1 it is characterised in that described according to described test
The temperature rise model that floor data calculates the described battery energy storage system to be assessed of acquisition comprises：
Described temperature rise model comprises discharge temperature rise and charging temperature rise；
The electric discharge temperature rise obtaining described battery energy storage system to be assessed is calculated according to described operating condition of test data by below equation：
ΔTdis=Tdis,e-Tdis,s；
Wherein, Δ TdisFor the electric discharge temperature rise of battery energy storage system to be assessed, Tdis,eTemperature when ending for battery discharge, Tdis,s
For temperature when initial for the battery；
The charging temperature rise obtaining described battery energy storage system to be assessed is calculated according to described operating condition of test data by below equation：
ΔTch=Tch,e-Tch,s
Wherein Δ TchFor the charging temperature rise of battery energy storage system to be assessed, Tch,eFor temperature during battery charge cutoff, Tch,sFor electricity
Temperature when pond is initial.
9. the battery energy storage system state evaluating method according to any one of claim 5 to claim 8, its feature exists
In the described operating condition of test packet by the predetermined period described battery energy storage system to be assessed of acquisition contains：To described electricity to be assessed
Pond energy-storage system carries out working condition tests, obtains an operating condition of test data after every 100 working condition tests.
10. battery energy storage system state evaluating method according to claim 1 is it is characterised in that described state-of-charge is estimated
Calculation situation comprises：By predetermined period test described battery energy storage system to be assessed when, the test initial value of described state-of-charge and
Difference between the end of test value of described state-of-charge.
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