CN109164396A - A kind of real-time ferric phosphate lithium cell life consumption appraisal procedure - Google Patents
A kind of real-time ferric phosphate lithium cell life consumption appraisal procedure Download PDFInfo
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Abstract
The invention discloses a kind of real-time ferric phosphate lithium cell life consumption appraisal procedures for belonging to field of power system, the real-time assessment ferric phosphate lithium cell life consumption includes: to carry out the experiment of ferric phosphate lithium cell cycle life, determine the AH total amount of ferric phosphate lithium cell, determine the charge volume of ferric phosphate lithium cell in certain period, it determines the charge volume of ferric phosphate lithium cell in certain period and determines the life consumption of ferric phosphate lithium cell, this ferric phosphate lithium cell life consumption appraisal procedure does not need the charging current I change curve for disposably obtaining entire cycle period ferric phosphate lithium cell and operating ambient temperature T change curve, while considering charge rate and ambient temperature effect, it can charge and discharge process carries out ferric phosphate lithium cell life consumption calculating online each time according to ferric phosphate lithium cell.This method basic structure is clear, calculating speed is fast, meets the requirement of real-time of ferric phosphate lithium cell life consumption assessment.
Description
Technical field
The invention belongs to field of power system, in particular to a kind of real-time ferric phosphate lithium cell lifetime estimation method.
Background technique
Due to the inherent characteristic of natural resources, generally have using wind-powered electricity generation and photovoltaic power generation as the power generation of the renewable resource of representative
Random fluctuation and uncertain characteristic.The two characteristics bring great challenge to renewable resource electricity generation grid-connecting.Energy storage
The application of technology can effectively alleviate the random fluctuation and unpredictability of renewable resource power generation, to realize renewable money
The large-scale grid connection of source power generation, undertakes certain base load instead of part conventional power generation unit.
Energy storage technology includes water-storage, compressed-air energy storage and various battery energy storages etc..Wherein, battery energy storage is not by ground
Shape, weather etc. influence, and also do not need special equipment, are more suitable for applying in renewable resource power generation.In all kinds of batteries, ferric phosphate
Lithium battery has many advantages, such as high power density, long circulation life and memoryless, and has good thermostabilization and chemical stability,
It is particularly suitable for large-capacity high-power energy storage applications.
In renewable energy power generation consumption, smart grid planning and designing, optimal coordinated control, quantitative energy storage service life damage
Consumption assessment is the key technology for considering energy storage Life Cost and carrying out fail-safe analysis.The loss in ferric phosphate lithium cell service life with fill
Discharge rate, charge and discharge number, depth of discharge, environment temperature, electrolyte concentration degree, concentration of electrolyte, high frequency diffusion etc. because
It is plain related, consider that the foundation of the Life Prediction Model of all correlative factors is very difficult, and calculating speed is unable to satisfy
The requirement that battery life is assessed in real time.
Currently, the battery life evaluation based on physical chemistry Ageing Model is most complicated and most perfect method, but the mould
Type needs a large amount of data information, volume and concentration including detailed geometric data (thickness and hole count of electrode), electrolyte
Deng this subparameter can be readily available in laboratory, but can not be obtained in the normal use process of battery.Based on thing
The Ageing Model of part guiding is defined there are event and classification difficult problem.The present invention is based on the AH total amount of ferric phosphate lithium cell not with
Depth of discharge and the feature changed, propose a kind of real-time ferric phosphate lithium cell life consumption appraisal procedure.
Summary of the invention
The purpose of the present invention is to propose to a kind of real-time ferric phosphate lithium cell life consumption appraisal procedures, which is characterized in that
Include the following steps:
1) carries out the experiment of ferric phosphate lithium cell cycle life
Randomly select 10 ferric phosphate lithium cell samples with model, depth of discharge DoD takes 10% respectively, 20%, 30%,
40%, it 50%, 60%, 70%, 80%, 90% and 100% carries out and 10 DoD1-DoD10Corresponding CtF1-CtF10Recycle the longevity
Order 10 experiments；The unit of cycle life CtF is secondary, wherein CtF1-CtF10Respectively ferric phosphate lithium cell sample accordingly discharges
Depth DoD1-DoD10Under test value, the test value and ferric phosphate lithium cell specification and type are closely related, to obtain phosphoric acid
The corresponding relationship of lithium iron battery cycle life and depth of discharge,
2) determines the AH total amount AHT of ferric phosphate lithium cell,
Shown under different depth of discharges according to theoretical research and experiment, the AHT of ferric phosphate lithium cell be to maintain it is constant,
Therefore, using AHT the average value AHT as ferric phosphate lithium cell, unit Ah under different depth of discharges；Calculation formula is such as
Under:
Wherein, EnomFor rated cell capacity, unit Ah；I=1,2 ..., 10；DoDiIt is deep for the electric discharge of 10%*i
Degree；CtFiFor DoDiCorresponding cycle life, unit are secondary；
The AH total amount of ferric phosphate lithium cell need to only calculate once, if specifications and models, battery types etc. are constant, the value is once
It determines, can use always, until ferric phosphate lithium cell is scrapped.
3) determines the discharge and recharge of ferric phosphate lithium cell in certain period
Putting into practical engineering application since ferric phosphate lithium cell, for cycle period, to determine in each period for 24 hours
The discharge and recharge of ferric phosphate lithium cell, particular content are as follows:
(1) ferric phosphate lithium cell state-of-charge (State of Charge, SoC) is recorded every 1min, state-of-charge SoC
Unit be Ah, obtain ferric phosphate lithium cell state-of-charge SoC change curve,
(2) variation tendency for judging ferric phosphate lithium cell state-of-charge SoC, when ferric phosphate lithium cell state-of-charge SoC by
When step increases, ferric phosphate lithium cell is in charged state at this time；When ferric phosphate lithium cell state-of-charge SoC is gradually reduced, this
When ferric phosphate lithium cell be in discharge condition；When adjacent moment ferric phosphate lithium cell state-of-charge SoC is equal in magnitude, phosphorus at this time
Sour lithium iron battery is in standby, and is neither charged nor is discharged；The sum of all charged state SoC incrementss are phosphorus in this period
The charge volume of sour lithium iron battery, is denoted as SoC+；The sum of all discharge condition SoC reduction amounts are ferric phosphate lithium cell in this period
Discharge capacity SoC-；
4) determines total discharge and recharge of ferric phosphate lithium cell
Putting into practical engineering application since ferric phosphate lithium cell, by ferric phosphate lithium cell in all cycle periods
Charge volume is added, and is obtained total charge volume of ferric phosphate lithium cell, is denoted as SoC+total, calculation formula is as follows:
Wherein, k is circulating cycle issue, k=1,2 ..., K；K is circulating cycle issue when calculating；SoC+kFor kth time
The ferric phosphate lithium cell charge volume of cycle period.
Putting into practical engineering application since ferric phosphate lithium cell, by ferric phosphate lithium cell in all cycle periods
Discharge capacity is added, and is obtained total discharge capacity of ferric phosphate lithium cell, is denoted as SoC-total, calculation formula is as follows:
Wherein, k is circulating cycle issue, k=1,2 ..., K；K is circulating cycle issue when calculating；SoC-kFor kth time
The ferric phosphate lithium cell discharge capacity of cycle period；
5) determines the life consumption LoL of ferric phosphate lithium cell,
State-of-charge SoC when ferric phosphate lithium cell initial launch and charged shape when ferric phosphate lithium cell end of run
When state SoC is equal in magnitude, total discharge capacity SoC of ferric phosphate lithium cell-totalEqual to total charge volume SoC+total, ferric phosphate lithium cell
Life consumption LoL are as follows:
State-of-charge SoC when ferric phosphate lithium cell initial launch and charged shape when ferric phosphate lithium cell end of run
When state SoC size is unequal, total discharge capacity SoC of ferric phosphate lithium cell-totalWith total charge volume SoC+totalIt is unequal；Consider most
Severe operation conditions, the life consumption LoL of ferric phosphate lithium cell are as follows:
As LoL=1, illustrate that the service life of ferric phosphate lithium cell has exhausted, ferric phosphate lithium cell needs to carry out more at this time
It changes.
The AHT of the ferric phosphate lithium cell need to only be calculated once, if ferric phosphate lithium cell specifications and models, battery types are all
It is constant, the value once it is determined that, can use always, until ferric phosphate lithium cell is scrapped.
The beneficial effects of the invention are as follows the ferric phosphate lithium cell life consumption appraisal procedures of proposition not to need disposably to obtain
The state-of-charge SoC change curve of entire cycle period ferric phosphate lithium cell, without to ferric phosphate lithium cell state-of-charge SoC
Time series is pre-processed, and can change online progress LiFePO4 each time according to ferric phosphate lithium cell state-of-charge SoC
Battery life loss calculation meets the requirement of real-time of ferric phosphate lithium cell life consumption assessment
Detailed description of the invention
Fig. 1 is ferric phosphate lithium cell state-of-charge change curve for 24 hours.
Fig. 2 determines the calculation process of ferric phosphate lithium cell discharge and recharge in certain period.
Specific embodiment
The invention proposes a kind of real-time ferric phosphate lithium cell life consumption appraisal procedures, with reference to the accompanying drawing with embodiment
The present invention is further described.
Real-time assessment of the present invention to ferric phosphate lithium cell life consumption includes the following steps:
1) carries out the experiment of ferric phosphate lithium cell cycle life
Randomly select 10 ferric phosphate lithium cell samples with model, depth of discharge DoD takes 10% respectively, 20%, 30%,
40%, it 50%, 60%, 70%, 80%, 90% and 100% carries out and 10 DoD1-DoD10Corresponding CtF1-CtF10Recycle the longevity
Order 10 experiments；The unit of cycle life CtF is secondary, wherein CtF1-CtF10Respectively ferric phosphate lithium cell sample accordingly discharges
Depth DoD1-DoD10Under test value, the test value and ferric phosphate lithium cell specification and type are closely related, to obtain phosphoric acid
The corresponding relationship of lithium iron battery cycle life and depth of discharge, as shown in table 1:
The relationship of table 1 ferric phosphate lithium cell cycle life and depth of discharge
2) determines the AH total amount (Amp Hours Throughput, AHT) of ferric phosphate lithium cell
Shown under different depth of discharges according to theoretical research and experiment, the AHT of ferric phosphate lithium cell is to maintain constant.
Therefore, the present invention is A as the unit of AH T, the AH T of ferric phosphate lithium cell using AHT average value under different depth of discharges
H, calculation formula are as follows:
Wherein, EnomFor rated cell capacity, unit Ah；I=1,2 ..., 10；DoDiIt is deep for the electric discharge of 10%*i
Degree；CtFiFor DoDiCorresponding cycle life, unit are secondary.
The AH total amount of ferric phosphate lithium cell need to only calculate once, if specifications and models, battery types etc. are constant, the value is once
It determines, can use always, until ferric phosphate lithium cell is scrapped.
3) determines the discharge and recharge of ferric phosphate lithium cell in certain period
Putting into practical engineering application since ferric phosphate lithium cell, for cycle period, to determine in each period for 24 hours
The discharge and recharge of ferric phosphate lithium cell, particular content are as follows:
(1) ferric phosphate lithium cell state-of-charge (State of Charge, SoC) is recorded every 1min, state-of-charge SoC
Unit be Ah, it is as shown in Figure 1 to obtain ferric phosphate lithium cell state-of-charge SoC change curve).
(2) variation tendency for judging ferric phosphate lithium cell state-of-charge SoC, when ferric phosphate lithium cell state-of-charge SoC by
When step increases, ferric phosphate lithium cell is in charged state at this time；When ferric phosphate lithium cell state-of-charge SoC is gradually reduced, this
When ferric phosphate lithium cell be in discharge condition；When adjacent moment ferric phosphate lithium cell state-of-charge SoC is equal in magnitude, phosphorus at this time
Sour lithium iron battery is in standby, and is neither charged nor is discharged；The sum of all charged state SoC incrementss are phosphorus in this period
The charge volume of sour lithium iron battery, is denoted as SoC+；The sum of all discharge condition SoC reduction amounts are ferric phosphate lithium cell in this period
Discharge capacity SoC:, specific calculation process (as shown in Figure 2) is as follows: enabling SoCs=SoC0, the charge volume SoC of lithium battery+=0, lithium
The discharge capacity SoC of battery-=0；Work as SoCi>SoCi-1When, SoC+=SoCi-SoCi-1+SoC+；Work as SoCi<SoCi-1When, SoC-=
SoCi-1-SoCi+SoC-；Work as SoCi=SoCi-1When, it is not processed.
4) determines total discharge and recharge of ferric phosphate lithium cell
Putting into practical engineering application since ferric phosphate lithium cell, by ferric phosphate lithium cell in all cycle periods
Charge volume is added, and is obtained total charge volume of ferric phosphate lithium cell, is denoted as SoC+total, calculation formula is as follows:
Wherein, k is circulating cycle issue, k=1,2 ..., K；K is circulating cycle issue when calculating；SoC+kFor kth time
The ferric phosphate lithium cell charge volume of cycle period.
Putting into practical engineering application since ferric phosphate lithium cell, by ferric phosphate lithium cell in all cycle periods
Discharge capacity is added, and is obtained total discharge capacity of ferric phosphate lithium cell, is denoted as SoC-total, calculation formula is as follows:
Wherein, k is circulating cycle issue, k=1,2 ..., K；K is circulating cycle issue when calculating；SoC-kFor kth time
The ferric phosphate lithium cell discharge capacity of cycle period.
5) determines the life consumption (Loss of Lifetime, LoL) of ferric phosphate lithium cell
State-of-charge SoC when ferric phosphate lithium cell initial launch and charged shape when ferric phosphate lithium cell end of run
When state SoC is equal in magnitude, total discharge capacity SoC of ferric phosphate lithium cell-totalEqual to total charge volume SoC+total, ferric phosphate lithium cell
Life consumption LoL are as follows:
State-of-charge SoC when ferric phosphate lithium cell initial launch and charged shape when ferric phosphate lithium cell end of run
When state SoC size is unequal, total discharge capacity SoC of ferric phosphate lithium cell-totalWith total charge volume SoC+totalIt is unequal, consider most
Severe operation conditions, the life consumption LoL of ferric phosphate lithium cell are as follows:
As LoL=1, illustrate that the service life of ferric phosphate lithium cell has exhausted, ferric phosphate lithium cell needs to carry out more at this time
It changes.
Ferric phosphate lithium cell life consumption appraisal procedure proposed by the present invention does not need disposably to obtain entire cycle period
The state-of-charge SoC change curve of ferric phosphate lithium cell is carried out without to ferric phosphate lithium cell state-of-charge SoC time series
Pretreatment can change online progress ferric phosphate lithium cell life consumption each time according to ferric phosphate lithium cell state-of-charge SoC
It calculates, meets the requirement of real-time of ferric phosphate lithium cell life consumption assessment.
Claims (2)
1. a kind of real-time ferric phosphate lithium cell life consumption appraisal procedure, which comprises the steps of:
1) carries out the experiment of ferric phosphate lithium cell cycle life
Randomly select 10 ferric phosphate lithium cell samples with model, depth of discharge DoD takes 10% respectively, 20%, 30%,
40%, it 50%, 60%, 70%, 80%, 90% and 100% carries out and 10 DoD1 invention-DoD10Corresponding CtF1-CtF10Circulation
Service life 10 times experiments；The unit of cycle life CtF is secondary, wherein CtF1-CtF10Respectively ferric phosphate lithium cell sample is accordingly put
Electric depth DoD1-DoD10Under test value, the test value and ferric phosphate lithium cell specification and type are closely related, to obtain phosphorus
The corresponding relationship of sour lithium iron battery cycle life and depth of discharge,
2) determines the AH total amount AHT of ferric phosphate lithium cell,
Shown under different depth of discharges according to theoretical research and experiment, the AHT of ferric phosphate lithium cell be to maintain it is constant, therefore,
Using AHT the average value AHT as ferric phosphate lithium cell, unit Ah under different depth of discharges；Calculation formula is as follows:
Wherein, EnomFor rated cell capacity, unit Ah；I=1,2 ..., 10；DoDiFor the depth of discharge of 10%*i；CtFi
For DoDiCorresponding cycle life, unit are secondary；
The AH total amount of ferric phosphate lithium cell need to only calculate once, if specifications and models, battery types etc. are constant, the value is once true
It is fixed, it can use always, until ferric phosphate lithium cell is scrapped；
3) determines the discharge and recharge of ferric phosphate lithium cell in certain period
Putting into practical engineering application since ferric phosphate lithium cell, for cycle period, to determine phosphoric acid in each period for 24 hours
The discharge and recharge of lithium iron battery, particular content are as follows:
(1) ferric phosphate lithium cell state-of-charge (State of Charge, SoC) is recorded every 1min, the list of state-of-charge SoC
Position is Ah, obtains ferric phosphate lithium cell state-of-charge SoC change curve,
(2) variation tendency for judging ferric phosphate lithium cell state-of-charge SoC, when ferric phosphate lithium cell state-of-charge SoC gradually increases
Added-time, ferric phosphate lithium cell is in charged state at this time；When ferric phosphate lithium cell state-of-charge SoC is gradually reduced, phosphorus at this time
Sour lithium iron battery is in discharge condition；When adjacent moment ferric phosphate lithium cell state-of-charge SoC is equal in magnitude, ferric phosphate at this time
Lithium battery is in standby, and is neither charged nor is discharged；The sum of all charged state SoC incrementss are ferric phosphate in this period
The charge volume of lithium battery, is denoted as SoC+；The sum of all discharge condition SoC reduction amounts are the electric discharge of ferric phosphate lithium cell in this period
Measure SoC-；
4) determines total discharge and recharge of ferric phosphate lithium cell
Putting into practical engineering application since ferric phosphate lithium cell, by the charging of ferric phosphate lithium cell in all cycle periods
Amount is added, and is obtained total charge volume of ferric phosphate lithium cell, is denoted as SoC+total, calculation formula is as follows:
Wherein, k is circulating cycle issue, k=1,2 ..., K；K is circulating cycle issue when calculating；SoC+kFor kth time circulation
The ferric phosphate lithium cell charge volume in period；
Putting into practical engineering application since ferric phosphate lithium cell, by the electric discharge of ferric phosphate lithium cell in all cycle periods
Amount is added, and is obtained total discharge capacity of ferric phosphate lithium cell, is denoted as SoC-total, calculation formula is as follows:
Wherein, k is circulating cycle issue, k=1,2 ..., K；K is circulating cycle issue when calculating；SoC-kFor kth time circulation
The ferric phosphate lithium cell discharge capacity in period；
5) determines the life consumption LoL of ferric phosphate lithium cell,
State-of-charge SoC when ferric phosphate lithium cell initial launch and state-of-charge when ferric phosphate lithium cell end of run
When SoC is equal in magnitude, total discharge capacity SoC of ferric phosphate lithium cell-totalEqual to total charge volume SoC+total, ferric phosphate lithium cell
Life consumption LoL are as follows:
State-of-charge SoC when ferric phosphate lithium cell initial launch and state-of-charge when ferric phosphate lithium cell end of run
When SoC size is unequal, total discharge capacity SoC of ferric phosphate lithium cell-totalWith total charge volume SoC+totalIt is unequal；Consideration is most disliked
Bad operation conditions, the life consumption LoL of ferric phosphate lithium cell are as follows:
As LoL=1, illustrate that the service life of ferric phosphate lithium cell has exhausted, ferric phosphate lithium cell is replaced at this time.
2. a kind of real-time ferric phosphate lithium cell life consumption appraisal procedure according to claim 1, which is characterized in that the phosphorus
The AHT of sour lithium iron battery need to only be calculated once, if ferric phosphate lithium cell specifications and models, battery types are all constant, the value is once
It determines, can use always, until ferric phosphate lithium cell is scrapped.
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