CN106443461B - Battery energy storage system state evaluating method - Google Patents
Battery energy storage system state evaluating method Download PDFInfo
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- CN106443461B CN106443461B CN201610806805.4A CN201610806805A CN106443461B CN 106443461 B CN106443461 B CN 106443461B CN 201610806805 A CN201610806805 A CN 201610806805A CN 106443461 B CN106443461 B CN 106443461B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 195
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 92
- 230000007423 decrease Effects 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 27
- 230000003068 static effect Effects 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 8
- 230000010287 polarization Effects 0.000 claims description 6
- 238000002813 epsilometer test Methods 0.000 claims description 4
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- 238000009825 accumulation Methods 0.000 description 7
- 230000003862 health status Effects 0.000 description 6
- 238000010998 test method Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
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- 229910052744 lithium Inorganic materials 0.000 description 4
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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
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Abstract
A kind of battery energy storage system state evaluating method, this method includes: obtaining the operation data of battery energy storage system to be assessed, the real-time transmitting case for obtaining the state-of-charge consistency of battery energy storage system to be assessed is calculated according to operation data；The operating condition of test data of the battery energy storage system to be assessed are obtained by predetermined period, the residual capacity for obtaining battery energy storage system to be assessed, peak power, polarizing voltage, open-circuit voltage, temperature rise model and state-of-charge are calculated according to operating condition of test data and estimates situation, estimate that situation obtains the decline situation of battery energy storage system to be assessed according to residual capacity, peak power, polarizing voltage, open-circuit voltage, temperature rise model and state-of-charge；The assessment result of battery energy storage system to be assessed is obtained according to the decline situation of the real-time transmitting case of the state-of-charge consistency of battery energy storage system to be assessed and battery energy storage system to be assessed.
Description
Technical field
The present invention relates to power test field, espespecially a kind of battery energy storage system state evaluating method.
Background technique
As a big branch of high-efficiency environment friendly in current energy field, electric energy is widely made in all trades and professions
With in electric car field, when battery capacity drops to 80% or less, it is generally recognized that be no longer appropriate on electric car after
It is continuous to use, if directly eliminated battery, it will cause the waste of resource.It is to reduce battery totle drilling cost that the echelon of power battery, which utilizes,
Effective means, following the flourishing with new-energy automobile, estimation the year two thousand thirty, only Chinese available secondary cell amount was reachable
To 50GWh.
For the energy-storage system of power grid occasion, use condition is relatively milder, relatively low to battery performance requirements, can be real
The echelon of existing power battery utilizes.But the driving cycle of electric car, maintenance situation difference are larger, it is retired after battery performance ginseng
Difference is uneven, and battery is retired to stored energy application from electric car, is also faced with many technical problems.
It is the integrated energy-accumulating power station of new battery in the energy-accumulating power station of operation, operation and maintenance technology is still immature, battery
The changing rule of performance parameter is still unintelligible, cannot formulate O&M fully according to laboratory characteristic operating condition life curve and overhaul plan
Slightly；And the operating parameter of new battery is generally empirically provided by cell production companies；Security requirement is more prominent, new electricity
Security test is generally passed through in pond, and the probability very little of safety issue occurs for single battery, but echelon will be moved back using energy-storage system
Fortune battery reconfigures, and a combination thereof performance is still to be tested；Echelon there is no standard can be according to using battery energy storage.
Summary of the invention
It is an object of that present invention to provide a kind of battery energy storage system state evaluating methods, for evaluating the echelon of energy-storage system
Utility.
In order to achieve the above object, battery energy storage system state evaluating method provided by the present invention specifically includes: obtaining to be evaluated
The operation data for estimating battery energy storage system calculates according to the operation data and obtains the charged of the battery energy storage system to be assessed
The real-time transmitting case of state consistency；The operating condition of test data of the battery energy storage system to be assessed are obtained by predetermined period,
The residual capacity for obtaining the battery energy storage system to be assessed, peak power, polarization electricity are calculated according to the operating condition of test data
Pressure, open-circuit voltage, temperature rise model and state-of-charge estimate situation, according to the residual capacity, the peak power, the polarization
Voltage, the open-circuit voltage, the temperature rise model and state-of-charge estimation situation obtain the battery energy storage system to be assessed
The decline situation of system；According to the real-time transmitting case of the state-of-charge consistency of the battery energy storage system to be assessed and it is described to
The decline situation of assessment battery energy storage system obtains the assessment result of battery energy storage system to be assessed.
In above-mentioned battery energy storage system state evaluating method, it is preferred that described calculated according to the operation data obtains
The real-time transmitting case of the state-of-charge consistency of the battery energy storage system to be assessed includes: being calculated according to the operation data
The voltage for obtaining the battery energy storage system to be assessed is very poor, Temperature Distribution and cell voltage standard deviation, according to the voltage pole
Poor, the described Temperature Distribution and the cell voltage standard deviation obtain the state-of-charge consistency of the battery energy storage system to be assessed
Real-time transmitting case.
In above-mentioned battery energy storage system state evaluating method, it is preferred that described to be calculated according to the operating condition of test data
The residual capacity for obtaining the battery energy storage system to be assessed includes: being calculated by the following formula according to the operating condition of test data
Obtain the residual capacity of the 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 described to be assessed by predetermined period test
Battery energy storage system includes: every three months once tests the battery energy storage system to be assessed.
In above-mentioned battery energy storage system state evaluating method, it is preferred that described to be calculated according to the operating condition of test data
The open-circuit voltage for obtaining the battery energy storage system to be assessed includes: being calculated by the following formula according to the operating condition of test data
Obtain the open-circuit voltage of the battery energy storage system to be assessed:
In above formula, V1Be 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
To the open-circuit voltage that 100% state-of-charge or the upper limit are after condition, static 1 hour；V3It is third time in 25 (± 5) DEG C items
Under part, 100% state-of-charge is charged to rated current or the upper limit is the open-circuit voltage after condition, static 1 hour；Vocv
For the open-circuit voltage of the battery energy storage system to be assessed.
In above-mentioned battery energy storage system state evaluating method, it is preferred that described to be calculated according to the operating condition of test data
The peak power for obtaining the battery energy storage system to be assessed includes: being calculated by the following formula according to the operating condition of test data
Obtain the peak power of the battery energy storage system to be assessed:
In above formula, Wp1It is the electric current for applying variation at 85%, tests electricity in the SOC (state-of-charge) of battery for first time
The internal resistance in pond and electric current according to application, are calculated the peak power of battery；Wp2It in the SOC of battery is 85% for second
Place applies the electric current of variation, tests the internal resistance of battery and the electric current according to application, the peak power of battery is calculated；Wp3For
For the third time at the SOC of battery is 85%, applies the electric current of variation, tests the internal resistance of battery and the electric current according to application, calculate
Obtain the peak power of battery；WpIt in the SOC of battery is the peak power at 85% for the battery energy storage system to be assessed.
In above-mentioned battery energy storage system state evaluating method, it is preferred that described to be calculated according to the operating condition of test data
The polarizing voltage for obtaining the battery energy storage system to be assessed includes: being calculated by the following formula according to the operating condition of test data
Obtain the polarizing voltage of the battery energy storage system to be assessed:
In above formula, Up1It is first time at 30%SOC point, to stop electric discharge, record electric discharge after the current discharge 18s of 1/3C
End point voltage and voltage after standing 10min, are calculated the polarizing voltage of battery；Up2For second at 30%SOC point, with
Stop electric discharge after the current discharge 18s of 1/3C, record electric discharge end point voltage and stand voltage after 10min, battery is calculated
Polarizing voltage；Up3It is third time at 30%SOC point, to stop electric discharge after the current discharge 18s of 1/3C, record electric discharge terminates
Point voltage and voltage after standing 10min, are calculated the polarizing voltage of battery；UpFor the pole of the battery energy storage system to be assessed
Change voltage.
In above-mentioned battery energy storage system state evaluating method, it is preferred that described to be calculated according to the operating condition of test data
The temperature rise model for obtaining the battery energy storage system to be assessed includes: the temperature rise model includes electric discharge temperature rise and charging temperature rise；
The electric discharge for obtaining the battery energy storage system to be assessed is calculated by the following formula according to the operating condition of test data
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 of battery when initial；
The charging for obtaining the battery energy storage system to be assessed is calculated by the following formula according to the operating condition of test data
Temperature rise:
ΔTch=Tch,e-Tch,s
Wherein Δ TchFor the charging temperature rise of battery energy storage system to be assessed, Tch,eTemperature when for battery charge cutoff,
Tch,sFor temperature of battery when initial.
In above-mentioned battery energy storage system state evaluating method, it is preferred that described described to be assessed by predetermined period acquisition
The operating condition of test data of battery energy storage system include: working condition tests are carried out to the battery energy storage system to be assessed, every 100 times
An operating condition of test data are obtained after working condition tests.
In above-mentioned battery energy storage system state evaluating method, it is preferred that the state-of-charge estimation situation includes: by pre-
When fixed cycle tests the battery energy storage system to be assessed, the survey of the test initial value and the state-of-charge of the state-of-charge
Try the difference between stop value.
The present invention utilizes batteries of electric automobile characteristic by research echelon, debugs in conjunction with wind-light storage Demonstration Station energy-storage system
Operating experience proposes one kind and is suitable for echelon using battery energy storage electricity using operational monitoring data and operating condition of test as data source
The state evaluating method stood, which is based on operation data, assesses energy-accumulating power station consistency degree of divergence in real time, based on examination
Floor data is tested, echelon is fully assessed and utilizes battery energy storage power station performance degradation degree, from battery life, aging, consistency angle
Degree proposes the index of six kinds of assessment energy-storage units health status, and given calculation method, threshold value, assessment cycle.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the flow diagram of battery energy storage system state evaluating method provided by the present invention；
Fig. 2 is that the state-of-charge of the present invention provided estimates that situation tests typical condition curve synoptic diagram.
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below with reference to embodiment and attached
Figure, is described in further details the present invention.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention,
But it is not as a limitation of the invention.
Please refer to shown in Fig. 1, battery energy storage system state evaluating method provided by the present invention specifically includes: S101 is obtained
The operation data of battery energy storage system to be assessed calculates according to the operation data and obtains the battery energy storage system to be assessed
The real-time transmitting case of state-of-charge consistency；S102 is obtained the test work of the battery energy storage system to be assessed by predetermined period
Condition data, according to the operating condition of test data calculate the residual capacity for obtaining the battery energy storage system to be assessed, peak power,
Polarizing voltage, open-circuit voltage, temperature rise model and state-of-charge estimate situation, according to the residual capacity, the peak power, institute
It states polarizing voltage, the open-circuit voltage, the temperature rise model and state-of-charge estimation situation and obtains the battery to be assessed
The decline situation of energy-storage system；S103 is according to the real-time diverging feelings of the state-of-charge consistency of the battery energy storage system to be assessed
Condition and the decline situation of the battery energy storage system to be assessed obtain the assessment result of battery energy storage system to be assessed.
Wherein, the operating condition of test data include the battery energy storage system to be assessed pass obtained during the test
In relevant parameters numbers such as residual capacity, peak power, polarizing voltage, open-circuit voltage, temperature rise model and state-of-charge estimation situations
According to the present invention will not enumerate herein.
In a preferred embodiment of the invention, above-mentioned steps S101 obtains described to be evaluated according to operation data calculating
The real-time transmitting case for estimating the state-of-charge consistency of battery energy storage system also includes: being calculated according to the operation data and obtains institute
The voltage for stating battery energy storage system to be assessed is very poor, Temperature Distribution and cell voltage standard deviation, very poor, described according to the voltage
Temperature Distribution and the cell voltage standard deviation obtain the real-time of the state-of-charge consistency of the battery energy storage system to be assessed
Transmitting case.
Status assessment index based on operation data can be analyzed in real time by monitoring data, can also periodically export operation
Data analysis；Due to the limitation of operating condition, which is mainly the coherency state for assessing energy-storage system, wherein above-mentioned
Voltage is very poor, Temperature Distribution and cell voltage standard deviation are obtained especially by following formula:
(1) voltage is very poor
Voltage is energy-accumulating power station monitoring quantity the most intensive, and the end voltage of each battery cell uploads in real time, therefore
It is the variable for being easiest to obtain.According to the Preservation tactics of energy-accumulating power station, each energy-storage units in operation, as long as there is a monomer
Voltage exceeds working range, and whole group energy-storage units should stop working, and therefore, the consistency of voltage directly affects energy-accumulating power station
Availability, therefore voltage consistency is to assess the key index of energy-storage lithium battery health status.
It is very poor that battery pack string stands voltage
ΔVmax=Vmax-Vmin (1)
In formula, VmaxWith VminTo be under same energy accumulation current converter, battery in battery pack monomer is after standing 1 hour
The maximum value and voltage minimum of voltage.
(2) Temperature Distribution
The chemical reaction of lithium battery and temperature are closely related, when temperature difference, capacity attenuation, internal resistance variation of resistance etc.
Will be different, therefore temperature consistency is the key index for assessing energy-storage lithium battery health status.
Battery pack string temperature is very poor
ΔTmax=Tmax-Tmin (2)
In formula, Δ TmaxIt is under same energy accumulation current converter, battery in battery pack monomer is once completely filling and (putting) electric process
In, the difference of maximum temperature and minimum temperature.
(3) the cell voltage standard deviation of battery pack string
Reflect the mathematical criterion of a large amount of similar parameter discrete degree from relative angle.Since lithium battery group string is by a large amount of electricity
Pond forms in series and parallel, therefore can be by the coefficient of standard deviation of the technical parameters such as analysis cell voltage, capacity, internal resistance, to battery
The trim situation of group string is assessed.Compared with cell voltage is very poor, cell voltage coefficient of standard deviation can more intuitive reflection group
At the cell voltage consistency of battery pack string, cell voltage standard deviation calculates as shown in formula 1.
In formula: uδ--- cell voltage coefficient of standard deviation；
δu--- cell voltage standard deviation；
--- battery pack string cell voltage average value；
ui--- i-th cell voltage；
N --- battery pack string battery number of elements.
(4) SOC coincident indicator
Battery pack string SOC very poor is the evaluation index for judging energy coincidence between battery pack string in operational process, the pole SOC
Difference is smaller, and the energy coincidence of battery pack string is better, and energy-storage units active volume is bigger, and SOC is very poor bigger, battery pack string energy
Consistency is poorer, and energy-storage units active volume is smaller.
In actual operation, when in use, performance is influenced power battery by many factors such as temperature, capacity, power,
The capacity of battery refers to that the electricity that battery can be provided under certain discharging condition, power-performance directly reflect battery and provide wink
When power ability；Therefore only according to health status, the consistency of the Capacity Assessment battery pack of battery, there are certain limitations
Property, if battery capacity is higher, at this time it is believed that cell health state is good；But its power-performance is very low, the electric current of battery pack
Ability to accept is lower, it is believed that the health status of battery pack is poor, and antipodal SOH assessment occurs in the battery pack same in this way
As a result, being clearly not meet scientific theory；Furthermore internal resistance, polarization and battery temperature rise of battery etc. also to the screening of battery, match
Group and cell health state have very important influence, according to the assessment to battery performance and parameter, present invention determine that influencing
6 important indicators of battery performance, specifically comprising 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.
Comprehensively consider actual capacity, peak power, polarizing voltage, open-circuit voltage, electric discharge temperature rise and the charging temperature of battery pack
The parameter of six evaluations consistency of battery pack and battery pack SOH is risen, in order to embody the coherency state of energy-storage units, increases dynamic
Coincident indicator increases state-of-charge estimation situation test, altogether in order to assess Energy Management System state-of-charge estimation situation
7 indexs, the definition and calculation method of index, evaluation cycle and threshold value are as follows:
In the preferred embodiment of the present invention, energy-storage units performance indicator recommends to use the reality of energy-storage battery Experimental Calibration
Border capacity performance index reflects the currently practical capacity of energy-storage battery, therefore described according to operating condition of test data calculating acquisition
The residual capacity of battery energy storage system to be assessed includes: being calculated by the following formula described in acquisition according to the operating condition of test data
The residual capacity of battery energy storage system to be assessed:
In above formula, SgFor the energy-storage battery Experimental Calibration in residual capacity, that is, real work of battery energy storage system to be assessed
Actual capacity index, %；ENorFor the nominal electric energy of battery energy storage system to be assessed, electricity Wh；ETestTo be filled 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).
The main object assessed in above-mentioned formula is energy-storage units (You Yitai energy accumulation current converter and its battery pile are constituted), real
E when border is tested1、E2、E3Test method difference is as follows:
A) it under the conditions of 25 (± 5) DEG C, is charged with rated power, until stop charging when rated power charging termination condition,
Hot stand-by duty is run 15 minutes；
B) it is discharged with rated power, until stopping electric discharge when rated power discharge off condition, records discharge energy E1, hot standby
It is run 15 minutes with state；
C) a)~b is repeated) twice, recording discharge energy respectively is E2、E3。
In real work, after staff obtains residual capacity by above-mentioned formula, it is compared with predetermined threshold, into
One step obtains the residual capacity grade of the battery energy storage system to be assessed, below to move back fortune when residual capacity index be 80%
For the energy-storage units of battery pack composition, the predetermined threshold is done by table 1 for example:
Table 1
| Put into operation the time limit | Residual capacity index Sg |
| First Year | Greater than 75% |
| Second year | Greater than 60% |
| Third year | Greater than 55% |
| 4th year | Greater than 50% |
| 5th year | Greater than 40% |
By above-mentioned table 1 it is found that being limited to third year year as battery energy storage system to be assessed puts into operation, and residual capacity is greater than hundred
It is if/55, then functional, it is on the contrary then poor, every three months can be taken to carry out primary battery storage to be assessed in real work
Can system measurement with compare, guarantee the even running of battery energy storage system to be assessed with this；Certain above-mentioned threshold value needs basis
Live applying working condition, the horizontal adjustment in real time of cell decay degree and O&M, herein by way of example only, not to the present invention do into
The limitation of one step.
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 hourocvFor, described calculated according to the operating condition of test data obtains the battery energy storage system to be assessed
The open-circuit voltage of system includes: being calculated by the following formula according to the operating condition of test data and obtains the battery energy storage system to be assessed
The open-circuit voltage of system:
In above formula, V1Be 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 to 100% state-of-charge or the upper limit is the open-circuit voltage of record after condition, static 1 hour；V3Exist for third time
Under the conditions of 25 (± 5) DEG C, 100% state-of-charge is charged to rated current or the upper limit is the note after condition, static 1 hour
The open-circuit voltage of record；VocvFor the open-circuit voltage of the battery energy storage system to be assessed.
The main object assessed in above-mentioned formula is energy-storage units (You Yitai energy accumulation current converter and its battery pile are constituted), real
V when border is tested1、V2、V3Test method difference is as follows:
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, open-circuit voltage V is recorded1；
C) a)~b is repeated) twice, recording discharge energy respectively is V2、V3。
In real work, after staff obtains open-circuit voltage by above-mentioned formula, it is compared with predetermined threshold, into
One step obtains the open-circuit voltage grade of the battery energy storage system to be assessed, below to move back fortune when open-circuit cell index be 100%
For the energy-storage units of the battery pack composition of (ideal value), the predetermined threshold is done by table 2 for example:
Table 2
| Put into operation the time limit | OCV |
| First Year | Greater than 99% |
| Second year | Greater than 98% |
| Third year | Greater than 97% |
| 4th year | Greater than 95% |
| 5th year | Greater than 92% |
By above-mentioned table 1 it is found that being limited to third year year as battery energy storage system to be assessed puts into operation, and open-circuit voltage is greater than hundred
It is if/97, then functional, it is on the contrary then poor, it can be taken in real work and the battery energy storage system to be assessed is carried out
Working condition tests, that is, open-circuit voltage is tested, and is obtained an operating condition of test data after every working condition tests 100 times, is guaranteed with this to be assessed
The operating condition of test data stabilization of battery energy storage system is effective；Certainly above-mentioned threshold value is needed according to live applying working condition, cell decay
Degree and the horizontal adjustment in real time of O&M, herein by way of example only, do not do further limitation to the present invention.
It is to apply the testing current battery of variation at 85% in the SOC of battery in a preferred embodiment of the invention
Internal resistance (voltage, electric current sampling time interval be 0.01s, initial current is generally 1/5C, and the electric current after variation is chosen as 1/
3C), peak power is further obtained thereafter, specific as follows:
R=Δ V ÷ Δ I (7)
Wherein Δ V, Δ I are the variation of voltage and current in battery.The voltage V that internal resistance influences is not consideredIRFreeFor
VIRFree=UOCV-IR (8)
Wherein UocvFor the open-circuit voltage of the battery SOC point, I is the current value after variation.The peak work of the SOC point battery
Rate WpAre as follows:
Wp=Vl×(VIRFree-Vl)÷R (9)
Peak power is calculated by formula (7)
In above formula, for the accuracy for guaranteeing peak power test, optional peak power, which is under stable state, obtains institute
State battery energy storage system to be assessed peak power (choose the battery energy storage system to be assessed SOC be in 85% when
Peak power), Wp1It is the electric current for applying variation at 85%, tests the internal resistance of battery and according to applying in the SOC of battery for first time
The peak power of battery is calculated in the electric current added；Wp2For second the SOC of battery be the electric current for applying variation at 85%,
The internal resistance of battery and the electric current according to application are tested, the peak power of battery is calculated；Wp3SOC for third time in battery is
At 85%, applies the electric current of variation, tests the internal resistance of battery and the electric current according to application, the peak power of battery is calculated；
WpIt in the SOC of battery is the peak power at 85% for the battery energy storage system to be assessed.
The main object assessed in above-mentioned formula is energy-storage units (You Yitai energy accumulation current converter and its battery pile are constituted), real
W when border is testedp1、Wp2、Wp3Test method difference is as follows:
A) the SOC of battery be 85% at, apply variation electric current, test battery internal resistance (voltage, electric current sampling when
Between between be divided into 0.01s, initial current is generally 1/5C, and the electric current after variation is chosen as 1/3C)；
B) U of battery is testedocv, according to the electric current of application, the peak power W of battery is calculatedp1；
C) a)~b is repeated) twice, calculate separately the peak power W for obtaining batteryp2、Wp3。
In real work, after staff obtains peak power by above-mentioned formula, it is compared with predetermined threshold, into
One step obtains the peak power class of the battery energy storage system to be assessed, below to move back fortune when battery peak power index be
For the energy-storage units of the battery pack composition of 100% (ideal value), the predetermined threshold is done by table 3 for example:
Table 3
By above-mentioned table 3 it is found that being limited to third year year as battery energy storage system to be assessed puts into operation, and open-circuit voltage is greater than hundred
It is if/92, then functional, it is on the contrary then poor, it can be taken in real work and the battery energy storage system to be assessed is carried out
Working condition tests, that is, peak power is tested, and is obtained an operating condition of test data after every working condition tests 100 times, is guaranteed with this to be assessed
The operating condition of test data stabilization of battery energy storage system is effective；Certainly above-mentioned threshold value is needed according to live applying working condition, cell decay
Degree and the horizontal adjustment in real time of O&M, herein by way of example only, do not do further limitation to the present invention.
In the preferred embodiment of the present invention, at 30%SOC point, to stop putting after the current discharge 18s of 1/3C
After electricity, electric discharge end point voltage and standing 10min for the difference of voltage, thus it is described according to operating condition of test data calculating
The polarizing voltage for obtaining the battery energy storage system to be assessed includes: being calculated by the following formula according to the operating condition of test data
Obtain the polarizing voltage of the battery energy storage system to be assessed:
Up=V18s-V10min (11)
Wherein V18sVoltage when for battery discharge 18s, V10minFor the voltage after battery standing 10min.
Polarizing voltage is calculated by formula (9)
In above formula, for the accuracy for guaranteeing polarizing voltage test, optional polarizing voltage, which is under stable state, obtains institute
State battery energy storage system to be assessed polarizing voltage (choose the battery energy storage system to be assessed SOC be in 30% when
Polarizing voltage), Up1It is first time at 30%SOC point, to stop electric discharge after the current discharge 18s of 1/3C, record electric discharge terminates
Point voltage and voltage after standing 10min, are 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 end point voltage and stand 10min after voltage, the pole of battery is calculated
Change voltage；Up3It is third time at 30%SOC point, to stop electric discharge, record electric discharge end point electricity after the current discharge 18s of 1/3C
Pressure and voltage after standing 10min, are calculated the polarizing voltage of battery；UpFor the polarization electricity of the battery energy storage system to be assessed
Pressure.
The main object assessed in above-mentioned formula is energy-storage units (You Yitai energy accumulation current converter and its battery pile are constituted), real
U when border is testedp1、Up2、Up3Test method difference is as follows:
A) at 30%SOC point, to stop electric discharge after the current discharge 18s of 1/3C；
B) recording playback electricity end point voltage and voltage after standing 10min, are calculated the polarizing voltage U of batteryp1；
C) a)~b is repeated) twice, calculate separately the polarizing voltage U for obtaining batteryp2、Up3
In real work, after staff obtains polarizing voltage by above-mentioned formula, it is compared with predetermined threshold, into
One step obtains the residual polarization voltage of the battery energy storage system to be assessed, below to move back fortune when battery peak power index be
For the energy-storage units of the battery pack composition of 100% (ideal value), the predetermined threshold is done by table 4 for example:
Table 4
| Put into operation the time limit | Polarizing voltage index |
| First Year | Greater than 102% |
| Second year | Greater than 105% |
| Third year | Greater than 108% |
| 4th year | Greater than 111% |
| 5th year | Greater than 115% |
By above-mentioned table 4 it is found that being limited to third year year as battery energy storage system to be assessed puts into operation, and residual capacity is greater than hundred
It is if/108, then functional, it is on the contrary then poor, can be taken in real work to the battery energy storage system to be assessed into
Row working condition tests, that is, polarizing voltage is tested, and is obtained an operating condition of test data after every working condition tests 100 times, is guaranteed with this to be evaluated
The operating condition of test data stabilization for estimating battery energy storage system is effective；Certainly above-mentioned threshold value needs decline according to live applying working condition, battery
Subtract degree and the horizontal adjustment in real time of O&M, herein by way of example only, further limitation is not done to the present invention.
In the preferred embodiment of the present invention, described calculated according to the operating condition of test data obtains the electricity to be assessed
The temperature rise model of pond energy-storage system includes: the temperature rise model includes electric discharge temperature rise and charging temperature rise；
Wherein discharge temperature rise (Δ Tdis): during the current discharge to blanking voltage of 1/3C, the raised temperature of inside battery
Degree；
ΔTdis=Tdis,e-Tdis,s (13)
Wherein Tdis,eTemperature when ending for battery discharge, Tdis,sFor temperature of battery when initial.
Charge temperature rise (Δ Tch): during charging to blanking voltage with the electric current of 1/3C, the raised temperature of inside battery.
ΔTch=TCh, e-Tch,s (15)
Wherein TCh, eTemperature when for battery charge cutoff, TCh, sFor temperature of battery when initial.
The main object assessed in above-mentioned formula is energy-storage units (You Yitai energy accumulation current converter and its battery pile are constituted), real
Δ T when border is testeddis1、ΔTch1、ΔTdis2、ΔTch2、ΔTdis3、ΔTch3Test method difference is as follows:
A) during with the current discharge to blanking voltage of 1/3C, the raised temperature of inside battery, the record temperature difference is Δ
Tdis1；
B) during charging to blanking voltage with the electric current of 1/3C, the raised temperature of inside battery, the record temperature difference is Δ
Tch1；
C) a)~b is repeated) twice, calculate separately the polarizing voltage Δ T for obtaining batterydis2、ΔTch2、ΔTdis3、ΔTch3。
In real work, after staff obtains temperature rise model by above-mentioned formula, it is compared with predetermined threshold, into
One step obtains the remaining temperature rise model of the battery energy storage system to be assessed, below to move back fortune when battery peak power index be
For the energy-storage units of the battery pack composition of 100% (ideal value), the predetermined threshold is done by table 5 for example:
Table 5
| Put into operation the time limit | Temperature rise model index |
| First Year | Greater than 101% |
| Second year | Greater than 103% |
| Third year | Greater than 105% |
| 4th year | Greater than 108% |
| 5th year | Greater than 112% |
By above-mentioned table 5 it is found that being limited to third year year as battery energy storage system to be assessed puts into operation, and residual capacity is greater than hundred
It is if/105, then functional, it is on the contrary then poor, can be taken in real work to the battery energy storage system to be assessed into
Row working condition tests, that is, temperature rise model is tested, and is obtained an operating condition of test data after every working condition tests 100 times, is guaranteed with this to be evaluated
The operating condition of test data stabilization for estimating battery energy storage system is effective；Certainly above-mentioned threshold value needs decline according to live applying working condition, battery
Subtract degree and the horizontal adjustment in real time of O&M, herein by way of example only, further limitation is not done to the present invention.
In a preferred embodiment of the invention, the state-of-charge estimation situation includes: by described in predetermined period test
When battery energy storage system to be assessed, between test initial value and the EOT end of test value of the state-of-charge of the state-of-charge
Difference；In real work, the predetermined period be the typical condition period after using state-of-charge calculate minimum unit, generally energy storage
Each batteries in parallel connection group under unit.
Echelon is generally operated at mild operating condition and SOC centre portion using battery, for above-described embodiment is more clearly explained, with
Under by taking flat volatility as an example for, the predetermined threshold is done by table 6 for example:
Table 6
The typical condition of table in simplification, available performance current amplitude should include following information:
The operating condition of design 1 hour recycles typical condition 2 times, and completion charge and discharge in 30 minutes are primary, curve graph such as Fig. 2 institute
Show, situation shown in provided state-of-charge estimation situation test typical condition curve graph, carries out with predetermined threshold according to fig. 2
Comparison it can be learnt that state-of-charge estimation situation grade, such as when state-of-charge estimation situation starting point deviation be lower than percentage
2 when, then it is functional, it is on the contrary then poor, can be taken in real work each year and carry out primary battery energy storage system to be assessed
Measurement with compare, guarantee the even running of battery energy storage system to be assessed with this；Certainly above-mentioned threshold value needs make according to scene
With the horizontal adjustment in real time of operating condition, cell decay degree and O&M, herein by way of example only, further limit is not done to the present invention
System.
The present invention utilizes batteries of electric automobile characteristic by research echelon, debugs in conjunction with wind-light storage Demonstration Station energy-storage system
Operating experience proposes one kind and is suitable for echelon using battery energy storage electricity using operational monitoring data and operating condition of test as data source
The state evaluating method stood, which is based on operation data, assesses energy-accumulating power station consistency degree of divergence in real time, based on examination
Floor data is tested, echelon is fully assessed and utilizes battery energy storage power station performance degradation degree, from battery life, aging, consistency angle
Degree proposes the index of six kinds of assessment energy-storage units health status, and given calculation method, threshold value, assessment cycle.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (9)
1. a kind of battery energy storage system state evaluating method, for being stored up in echelon using the battery is evaluated in battery energy storage system
Energy system, which is characterized in that the method includes:
The operation data for obtaining battery energy storage system to be assessed calculates according to the operation data and obtains the battery storage to be assessed
The real-time transmitting case of the state-of-charge consistency of energy system；
The operating condition of test data that the battery energy storage system to be assessed is obtained by predetermined period, according to the operating condition of test data meter
Calculate the residual capacity for obtaining the 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 the residual capacity, peak power, the polarizing voltage, the open-circuit voltage, described
Temperature rise model and state-of-charge estimation situation obtain the decline situation of the battery energy storage system to be assessed；
According to the real-time transmitting case of the state-of-charge consistency of the battery energy storage system to be assessed and the battery to be assessed
The decline situation of energy-storage system obtains the assessment result of battery energy storage system to be assessed；
The residual capacity for calculating the acquisition battery energy storage system to be assessed according to the operating condition of test data includes:
The residual capacity for obtaining the battery energy storage system to be assessed is calculated by the following formula according to the operating condition of test data:
In above formula, SgFor the residual capacity of battery energy storage system to be assessed, %；ENorFor the nominal electricity of battery energy storage system to be assessed
Can, electricity Wh；ETestThe discharge energy of battery energy storage system to be assessed, electricity Wh.
2. battery energy storage system state evaluating method according to claim 1, which is characterized in that described according to the operation
The real-time transmitting case that data calculate the state-of-charge consistency for obtaining the battery energy storage system to be assessed includes: according to described
Operation data calculate obtain the battery energy storage system to be assessed voltage is very poor, Temperature Distribution and cell voltage standard deviation, root
According to the voltage, very poor, the described Temperature Distribution and the cell voltage standard deviation obtain the lotus of the battery energy storage system to be assessed
The real-time transmitting case of electricity condition consistency.
3. battery energy storage system state evaluating method according to claim 1, which is characterized in that described to be surveyed by predetermined period
Trying the battery energy storage system to be assessed includes: every three months once tests the battery energy storage system to be assessed.
4. battery energy storage system state evaluating method according to claim 1, which is characterized in that described according to the test
The open-circuit voltage that floor data calculates the acquisition battery energy storage system to be assessed includes:
The open-circuit voltage for obtaining the battery energy storage system to be assessed is calculated by the following formula according to the operating condition of test data:
In above formula, V1It is first time under the conditions of 25 (± 5) DEG C, 100% state-of-charge is charged to rated current or the upper limit is to cut
Open-circuit voltage to condition, 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 the open-circuit voltage after condition, static 1 hour；V3It is third time in 25 (± 5) DEG C conditions
Under, 100% state-of-charge is charged to rated current or the upper limit is the open-circuit voltage after condition, static 1 hour；VocvFor
The open-circuit voltage of the battery energy storage system to be assessed.
5. battery energy storage system state evaluating method according to claim 1, which is characterized in that described according to the test
The peak power that floor data calculates the acquisition battery energy storage system to be assessed includes:
The peak power for obtaining the battery energy storage system to be assessed is calculated by the following formula according to the operating condition of test data:
In above formula, Wp1It is the electric current for applying variation at 85%, surveys in the SOC of the battery energy storage system to be assessed for first time
The internal resistance of battery and the electric current according to application are tried, the peak power of battery is calculated；Wp2For second in the electricity to be assessed
The SOC of pond energy-storage system is the electric current for applying variation at 85%, tests the internal resistance of battery and the electric current according to application, is calculated
To the peak power of battery；Wp3It in the SOC of the battery energy storage system to be assessed is to apply the electricity of variation at 85% for third time
Stream, the internal resistance of test battery and the electric current according to application, are calculated the peak power of battery；WpIt is stored up for the battery to be assessed
Energy system is in the peak power that the SOC of battery is at 85%.
6. battery energy storage system state evaluating method according to claim 1, which is characterized in that described according to the test
The polarizing voltage that floor data calculates the acquisition battery energy storage system to be assessed includes:
The polarizing voltage for obtaining the battery energy storage system to be assessed is calculated by the following formula according to the operating condition of test data:
In above formula, Up1It is first time at the 30%SOC point of the battery energy storage system to be assessed, with the current discharge of 1/3C
Stop electric discharge after 18s, record electric discharge end point voltage and stand voltage after 10min, the polarizing voltage of battery is calculated；Up2For
For the second time at the 30%SOC point of the battery energy storage system to be assessed, to stop electric discharge, note after the current discharge 18s of 1/3C
Recording playback electricity end point voltage and voltage after standing 10min, are calculated the polarizing voltage of battery；Up3It is third time described to be evaluated
Estimate at the 30%SOC point of battery energy storage system, to stop electric discharge, record electric discharge end point voltage after the current discharge 18s of 1/3C
With voltage after standing 10min, the polarizing voltage of battery is calculated；UpFor the polarization electricity of the battery energy storage system to be assessed
Pressure.
7. battery energy storage system state evaluating method according to claim 1, which is characterized in that described according to the test
The temperature rise model that floor data calculates the acquisition battery energy storage system to be assessed includes:
The temperature rise model includes electric discharge temperature rise and charging temperature rise；
The electric discharge temperature rise for obtaining the battery energy storage system to be assessed is calculated by the following formula according to the operating condition of test data:
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 of battery when initial；
The charging temperature rise for obtaining the battery energy storage system to be assessed is calculated by the following formula according to the operating condition of test data:
ΔTch=Tch,e-Tch,s
Wherein Δ TchFor the charging temperature rise of battery energy storage system to be assessed, Tch,eTemperature when for battery charge cutoff, Tch,sFor electricity
Temperature when pond is initial.
8. battery energy storage system state evaluating method, feature according to any one of claim 4 to claim 7 exist
In the operating condition of test data for obtaining the battery energy storage system to be assessed by predetermined period include: to the 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.
9. battery energy storage system state evaluating method according to claim 1, which is characterized in that the state-of-charge estimation
Situation includes: when testing the battery energy storage system to be assessed by predetermined period, the test initial value of the state-of-charge and institute
State the difference between the EOT end of test value of state-of-charge.
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| CN107947207A (en) * | 2017-11-12 | 2018-04-20 | 苏州普罗森美电子科技有限公司 | A kind of EV battery energy storage systems status assessment management system |
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