CN107195932A - The stable regulation and control method of flow battery capacity, system and flow battery - Google Patents
The stable regulation and control method of flow battery capacity, system and flow battery Download PDFInfo
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- CN107195932A CN107195932A CN201610144543.XA CN201610144543A CN107195932A CN 107195932 A CN107195932 A CN 107195932A CN 201610144543 A CN201610144543 A CN 201610144543A CN 107195932 A CN107195932 A CN 107195932A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a kind of stable regulation and control method of flow battery capacity, system and flow battery, the system includes the acquiring unit for obtaining the current electrolyte volume attenuation rate of flow battery；For judging whether the current electrolyte volume attenuation rate of flow battery presets the first judging unit of attenuation rate less than first；The first judging unit is connected, for when the current electrolyte volume attenuation rate of flow battery is optionally greater than the first default attenuation rate, judging whether the current electrolyte volume attenuation rate of flow battery presets the second judging unit of attenuation rate less than second；Connect the control unit of the second judging unit；The present invention can effectively improve flow battery capacity holding capacity, reduce the cost of capacity restoration agent, realize that flow battery capacity and performance keep stable for a long time.
Description
Technical field
The invention belongs to flow battery technology field, and in particular to a kind of stable regulation and control method of flow battery capacity,
System and flow battery.
Background technology
Flow battery is one of one preferred technique of extensive stored energy application, with reference to shown in Fig. 1, in the prior art
Flow battery generally include pile 6, the anode electrolyte being composed in series by battery cell or multiple battery cells
Storage tank 3, cathode electrolyte storage tank 4, circulating pump 5 and liquid transmission pipeline 1, wherein battery cell are included just
Pole, negative pole, anode electrolyte and electrolyte liquid；Anolyte liquid storage tank 3 passes through liquid through circulating pump 5
Transfer pipeline 1 is connected with the anode electrolyte entrance 63 of pile 6, the anode electrolyte outlet 61 of pile 6
It is connected through liquid transmission pipeline 1 with anolyte liquid storage tank 3, cathode electrolyte storage tank 4 is logical through circulating pump 5
Cross liquid transmission pipeline 1 with the electrolyte liquid entrance 64 of pile 6 to be connected, the electrolyte liquid of pile 6 goes out
Mouth 62 is connected through liquid transmission pipeline 1 with cathode electrolyte storage tank 4；Set on the liquid transmission pipeline 1
There is motor-driven valve 2；There are the following problems for this flow battery of the prior art：In flow battery charge and discharge cycles
During, due to the ion between both positive and negative polarity and water migration, electrolyte can be caused gradually unbalance so that battery
Efficiency and capacity reduction, in the prior art for flow battery capacity attenuation degree detection means, generally
By suspending the operation of flow battery, electrolyte sampling is then carried out, and then show that the vanadium ion of electrolyte is dense
Degree state, so that the capacity attenuation degree of flow battery is known, further, for there is capacity attenuation journey
Also there is certain blank, United States Patent (USP) in the capacity regulation and control scheme of flow battery after degree, domestic prior art
US6764789 proposes two kinds of alternatives：Liquid adjusting method and press over system, but need extra electricity in batches
Can and/or equipment redistribute mixed electrolytic solution；United States Patent (USP) US20110300417 proposes both positive and negative polarity electricity
The method for solving liquid storage tank UNICOM, keeps the level of liquid level so that flow battery capacity keeps steady for a long time for a long time
It is fixed, studies have found that, the long-term generation for keeping both positive and negative polarity UNICOM to cause electric leakage reduces system effectiveness,
And after different run times, for the best flow battery performance of acquisition and capacity stability,
Both positive and negative polarity liquid level of electrolyte difference is change, and by the above, capacity can not be realized in the prior art
The on-line monitoring of attenuation degree and regulation and control, influence running efficiency of system, are declined simultaneously for for different capacity
Subtract degree to use different control methods, not yet there is effective solution in the prior art.
The content of the invention
The present invention is directed to the proposition of problem above, and developing one kind can realize that flow battery capacity and performance are long
Time keeps the stable stable regulation and control method of flow battery capacity, system and flow battery.
The technological means of the present invention is as follows：
A kind of stable regulation and control method of flow battery capacity, comprises the following steps：
Step 1：Obtain the current electrolyte volume attenuation rate of flow battery；
Step 2：Whether the current electrolyte volume attenuation rate of flow battery is judged less than the first default attenuation rate,
It is then return to step 1, otherwise performs step 3；
Step 3：Whether the current electrolyte volume attenuation rate of flow battery is judged less than the second default attenuation rate,
It is then to perform step 4, otherwise performs step 5；
Step 4：The liquid level of anode electrolyte and electrolyte liquid is adjusted, makes anode electrolyte and negative electricity
Liquid level difference between solution liquid is less than total vanadium ratio in preset value or anode electrolyte and electrolyte liquid and is maintained at
Preset ratio scope；
Step 5：Desired amount of capacity restoration is added into anolyte liquid storage tank and cathode electrolyte storage tank
Agent；
Further, the step 1 specifically includes following steps：
Step 11：Monitor flow battery running state parameter；
Step 12：According to the flow battery running state parameter monitored, shape is run with reference to the flow battery
Corresponding relation between state parameter and electrolyte volume attenuation rate, obtains the current electrolyte volume of flow battery
Attenuation rate；
Further, also there are following steps before step 11：
Determine the corresponding relation between flow battery running state parameter and electrolyte volume attenuation rate and storage；
Further, pair determined between flow battery running state parameter and electrolyte volume attenuation rate
Relationship step is answered to specifically include：
Obtain initial flow battery running state parameter；
Charge-discharge test is carried out to flow battery, the different flow batteries operation during charge-discharge test is obtained
State parameter；
With change of the flow battery running state parameter during charge-discharge test, multiple positive pole electricity is carried out
Solve the sampling of liquid and electrolyte liquid, and know sampling anode electrolyte and electrolyte liquid vanadium ion it is dense
Degree；
According to the anode electrolyte and the vanadium ion concentration situation of electrolyte liquid known, corresponding electricity is calculated
Solve liquid capacity attenuation rate situation；
Draw the corresponding relation between flow battery running state parameter and electrolyte volume attenuation rate；
Further, according to the current electrolyte volume attenuation rate of flow battery, and it is anode electrolyte, negative
The volume of pole electrolyte, the consumption of capacity restoration agent needed for calculating.
A kind of stable regulator control system of flow battery capacity, including：
Obtain the acquiring unit of the current electrolyte volume attenuation rate of flow battery；
Acquiring unit is connected, for judging whether the current electrolyte volume attenuation rate of flow battery is pre- less than first
If the first judging unit of attenuation rate；
The first judging unit is connected, for being optionally greater than first when the current electrolyte volume attenuation rate of flow battery
During default attenuation rate, judge the current electrolyte volume attenuation rate of flow battery whether less than the second default decay
Second judging unit of rate；When the current electrolyte volume attenuation rate of flow battery is optionally greater than the second default decay
During rate, perform and desired amount of capacity restoration agent is added into anolyte liquid storage tank and cathode electrolyte storage tank
Operation；
The control unit of the second judging unit is connected, described control unit is used to work as the current electrolyte of flow battery
Capacity attenuation rate during simultaneously above equal to the first default attenuation rate, adjusts positive pole less than the second default attenuation rate
The liquid level of electrolyte and electrolyte liquid, makes the liquid level difference between anode electrolyte and electrolyte liquid small
Total vanadium ratio is maintained at preset ratio scope in preset value or anode electrolyte and electrolyte liquid；
In addition, the stable regulator control system of the capacity also includes：
Monitoring unit for monitoring flow battery running state parameter；The acquiring unit is according to being monitored
Flow battery running state parameter, with reference to the flow battery running state parameter and electrolyte volume attenuation rate
Between corresponding relation, obtain the current electrolyte volume attenuation rate of flow battery.
A kind of flow battery, including the stable regulator control system of flow battery capacity described above；
Further, the flow battery includes：Pile, anolyte liquid storage tank, cathode electrolyte storage tank,
Liquid transmission pipeline and circulating pump；Anolyte liquid storage tank passes through liquid transmission pipeline and pile through circulating pump
Anode electrolyte entrance is connected, and the anode electrolyte of pile is exported respectively through liquid transmission pipeline and anolyte
Liquid storage tank is connected with cathode electrolyte storage tank；Cathode electrolyte storage tank through circulating pump by liquid transmission pipeline with
The electrolyte liquid entrance of pile is connected, the electrolyte liquid outlet of pile respectively through liquid transmission pipeline with just
Pole electrolyte storage tank is connected with cathode electrolyte storage tank；
It is provided with the anolyte liquid storage tank and cathode electrolyte storage tank for adding capacity restoration agent
Charge door；
Further, the liquid between the anode electrolyte outlet of the pile and anolyte liquid storage tank is conveyed
Liquid transmission pipeline, pile between pipeline, the anode electrolyte outlet of pile and cathode electrolyte storage tank
Electrolyte liquid exports the electrolyte of the liquid transmission pipeline and pile between anolyte liquid storage tank
Liquid, which is exported, to be provided with the liquid transmission pipeline between cathode electrolyte storage tank for being turned on and off liquid
The motor-driven valve of transfer pipeline；Described control unit is by controlling the working condition of the motor-driven valve to realize positive pole electricity
Solve the regulation of the liquid level of liquid and electrolyte liquid.
By adopting the above-described technical solution, compared to the prior art, the flow battery capacity that the present invention is provided
Stable regulation and control method, system and flow battery have the following advantages that：
1st, the present invention can according to capacity attenuation degree difference and use different regulating strategies, be included in compared with
Using regulation both positive and negative polarity electrolyte liquid level difference mode under low attenuation degree, and adopted under higher attenuation degree
With addition capacity restoration agent mode, different regulating strategies is used for differential declines degree, can effectively be carried
High liquid flow battery capacity holding capacity, reduces the cost of capacity restoration agent, realizes flow battery capacity and performance
Keep stable for a long time.
2nd, simple in construction, control measures intelligence degree of the invention is high, it is only necessary to will monitoring and judge module letter
Battery management system is singly integrated into, and is eliminated in the prior art between both positive and negative polarity electrolyte storage tank
The leakage current of the structure of cross over pipe, effectively reduction battery system is set, the effect of battery system is increased substantially
Rate and security；
3rd, the present invention realizes the on-line monitoring of the capacity attenuation degree of flow battery, and many according to flow battery
The function model between running state parameter and electrolyte volume attenuation rate is planted, easily knows that flow battery is any
Capacity attenuation situation under moment and state, eliminates and goes to flow battery project scene to carry out electrolyte sampling
And analytical procedure, simple operation is practical, significantly save the flow battery operation maintenance stage manpower,
Material resources and financial resources.
Brief description of the drawings
Fig. 1 is the structural representation of flow battery of the prior art；
Fig. 2, Fig. 3 are the structural representations of the stable regulator control system of flow battery capacity of the present invention and flow battery；
Fig. 4 is the flow chart of the stable regulation and control method of capacity of the present invention；
Fig. 5 is the method flow diagram of step 1 of the present invention；
Fig. 6 is between determination flow battery running state parameter of the present invention and electrolyte volume attenuation rate
The flow chart of corresponding relation step；
In figure：1st, liquid transmission pipeline, 2, motor-driven valve, 3, anolyte liquid storage tank, 4, electrolyte
Liquid storage tank, 5, circulating pump, 6, pile, 7, charge door, 61, anode electrolyte outlet, 62, negative electricity
Solve liquid outlet, 63, anode electrolyte entrance, 64, electrolyte liquid entrance.
Embodiment
The stable regulation and control method of flow battery capacity as shown in Figure 4 and Figure 5, comprises the following steps：
Step 1：Obtain the current electrolyte volume attenuation rate of flow battery；
Step 2：Whether the current electrolyte volume attenuation rate of flow battery is judged less than the first default attenuation rate,
It is then return to step 1, otherwise performs step 3；
Step 3：Whether the current electrolyte volume attenuation rate of flow battery is judged less than the second default attenuation rate,
It is then to perform step 4, otherwise performs step 5；
Step 4：The liquid level of anode electrolyte and electrolyte liquid is adjusted, makes anode electrolyte and negative electricity
Liquid level difference between solution liquid is less than total vanadium ratio in preset value or anode electrolyte and electrolyte liquid and is maintained at
Preset ratio scope；
Step 5：It is extensive that desired amount of capacity is added into anolyte liquid storage tank 3 and cathode electrolyte storage tank 4
Multiple agent；
Further, the step 1 specifically includes following steps：
Step 11：Monitor flow battery running state parameter；
Step 12：According to the flow battery running state parameter monitored, shape is run with reference to the flow battery
Corresponding relation between state parameter and electrolyte volume attenuation rate, obtains the current electrolyte volume of flow battery
Attenuation rate；
Further, also there are following steps before step 11：
Determine the corresponding relation between flow battery running state parameter and electrolyte volume attenuation rate and storage；
Further, pair determined between flow battery running state parameter and electrolyte volume attenuation rate
Relationship step is answered to specifically include：
Obtain initial flow battery running state parameter；
Charge-discharge test is carried out to flow battery, the different flow batteries operation during charge-discharge test is obtained
State parameter；
With change of the flow battery running state parameter during charge-discharge test, multiple positive pole electricity is carried out
Solve the sampling of liquid and electrolyte liquid, and know sampling anode electrolyte and electrolyte liquid vanadium ion it is dense
Degree；
According to the anode electrolyte and the vanadium ion concentration situation of electrolyte liquid known, corresponding electricity is calculated
Solve liquid capacity attenuation rate situation；
Draw the corresponding relation between flow battery running state parameter and electrolyte volume attenuation rate；
Further, according to the current electrolyte volume attenuation rate of flow battery, and it is anode electrolyte, negative
The volume of pole electrolyte, the consumption of capacity restoration agent needed for calculating.
A kind of stable regulator control system of flow battery capacity as shown in Figures 2 and 3, including：Obtain liquid stream electricity
The acquiring unit of the current electrolyte volume attenuation rate in pond；Acquiring unit is connected, for judging that flow battery is current
Whether electrolyte volume attenuation rate presets the first judging unit of attenuation rate less than first；Connection first judges single
Member, for when the current electrolyte volume attenuation rate of flow battery is optionally greater than the first default attenuation rate, judging
Whether the current electrolyte volume attenuation rate of flow battery presets the second judging unit of attenuation rate less than second；
When the current electrolyte volume attenuation rate of flow battery is optionally greater than the second default attenuation rate, perform to positive pole electricity
Solve the operation of the desired amount of capacity restoration agent of addition in liquid storage tank 3 and cathode electrolyte storage tank 4；Connection the
The control unit of two judging units, described control unit is used to work as the current electrolyte volume attenuation rate of flow battery
Less than the second default attenuation rate, during simultaneously above equal to the first default attenuation rate, anode electrolyte is adjusted and negative
The liquid level of pole electrolyte, make liquid level difference between anode electrolyte and electrolyte liquid be less than preset value or
Total vanadium ratio is maintained at preset ratio scope in person's anode electrolyte and electrolyte liquid；In addition, the capacity
Stable regulator control system also includes：Monitoring unit for monitoring flow battery running state parameter；It is described to obtain
Unit according to the flow battery running state parameter monitored, with reference to the flow battery running state parameter with
Corresponding relation between electrolyte volume attenuation rate, obtains the current electrolyte volume attenuation rate of flow battery；
Corresponding relation between flow battery running state parameter and electrolyte volume attenuation rate, which can be realized, to be determined and deposits
Storage.
A kind of flow battery as shown in Figures 2 and 3, including pile 6, anolyte liquid storage tank 3, negative pole
Electrolyte storage tank 4, liquid transmission pipeline 1 and circulating pump 5；Anolyte liquid storage tank 3 passes through through circulating pump 5
Liquid transmission pipeline 1 is connected with the anode electrolyte entrance 63 of pile 6, the anode electrolyte outlet of pile 6
61 are connected through liquid transmission pipeline 1 with anolyte liquid storage tank 3 and cathode electrolyte storage tank 4 respectively；Negative pole
Electrolyte storage tank 4 is through electrolyte liquid entrance 64 phase of the circulating pump 5 by liquid transmission pipeline 1 and pile 6
Even, the electrolyte liquid of pile 6 outlet 62 respectively through liquid transmission pipeline 1 and anolyte liquid storage tank 3 and
Cathode electrolyte storage tank 4 is connected；It is respectively provided with the anolyte liquid storage tank 3 and cathode electrolyte storage tank 4
There is the charge door 7 for adding capacity restoration agent；The anode electrolyte outlet 61 of the pile 6 and positive pole electricity
Solve liquid transmission pipeline 1, anode electrolyte outlet 61 and the electrolyte liquid of pile 6 between liquid storage tank 3
Electrolyte liquid outlet 62 and the anolyte liquid storage tank of liquid transmission pipeline 1, pile 6 between storage tank 4
Electrolyte liquid outlet 62 and the cathode electrolyte storage tank 4 of liquid transmission pipeline 1 and pile 6 between 3
Between liquid transmission pipeline 1 on be provided with motor-driven valve 2 for being turned on and off liquid transmission pipeline 1；
Described control unit is by controlling the working condition of the motor-driven valve 2 to realize anode electrolyte and electrolyte liquid
Liquid level regulation.
Flow battery running state parameter of the present invention be state-of-charge SOC and/or both positive and negative polarity liquid level difference (just
The liquid level difference between the electrolyte in electrolyte and cathode electrolyte storage tank 4 in pole electrolyte storage tank 3), under
Face come pair to determine by state-of-charge SOC of flow battery running state parameter flow battery running state parameter with
Corresponding relation step between electrolyte volume attenuation rate is illustrated：Initial state-of-charge is obtained first
SOC0(flow battery does not carry out the SOC before following charge-discharge test, and generally initial state-of-charge can be with
For 100% or 0%), continuous charge-discharge test then is carried out with rated power to flow battery, it is real in discharge and recharge
End discharge and recharge under different SOC states during testing, and carry out multiple anode electrolyte and negative electricity respectively
The sampling of liquid is solved, while knowing the anode electrolyte of sampling and the vanadium ion concentration of electrolyte liquid；According to obtaining
The anode electrolyte and the vanadium ion concentration situation of electrolyte liquid known, calculate corresponding electrolyte volume and decline
Lapse rate R；Further, the different SOC and electrolyte volume attenuation rate during charge-discharge test are drawn
Between corresponding relation, specifically, being capable of electrolyte volume attenuation rate R=(xi-SOC0)/(1-SOC0), this
In xi(repeatedly end charge-discharge test for the state-of-charge SOC corresponding to electrolyte difference sampling moment i
When different SOC)；Carry out a pair determination liquid stream electricity by both positive and negative polarity liquid level difference of flow battery running state parameter below
Corresponding relation step between pond running state parameter and electrolyte volume attenuation rate is illustrated：Obtain first
Obtain the initial liquid level height of the electrolyte and the electrolyte in cathode electrolyte storage tank 4 in anolyte liquid storage tank 3
Spend L0；Then continuous charge-discharge test is carried out with rated power to flow battery, and obtained in charge-discharge test
During different both positive and negative polarity liquid level differences；With change of the both positive and negative polarity liquid level difference during charge-discharge test,
The sampling of multiple anode electrolyte and electrolyte liquid is carried out respectively, and is known the anode electrolyte of sampling and born
The vanadium ion concentration of pole electrolyte；According to the anode electrolyte and the vanadium ion concentration feelings of electrolyte liquid known
Condition, calculates corresponding electrolyte volume attenuation rate R；Further, draw during charge-discharge test
Corresponding relation between different both positive and negative polarity liquid level differences and electrolyte volume attenuation rate, specifically, draws electrolyte
Capacity attenuation rate R=yi/2L0, y hereiFor the both positive and negative polarity liquid level difference corresponding to electrolyte difference sampling moment i；
It is below that state-of-charge SOC and both positive and negative polarity liquid level difference carry out a pair determination liquid stream electricity using flow battery running state parameter
Corresponding relation step between pond running state parameter and electrolyte volume attenuation rate is illustrated：Obtain first
Obtain initial state-of-charge SOC0(flow battery does not carry out the SOC before following charge-discharge test, generally just
Beginning state-of-charge can be 100% or electrolyte 0%), in anolyte liquid storage tank 3 and the storage of electrolyte liquid
The initial liquid level height L of electrolyte in tank 40；Then continuous charge and discharge is carried out with rated power to flow battery
Electricity experiment, ends discharge and recharge under the different SOC states during charge-discharge test, is filled while obtaining cut-off
Both positive and negative polarity liquid level difference during electric discharge, and the sampling of multiple anode electrolyte and electrolyte liquid is carried out respectively, with
And know the anode electrolyte of sampling and the vanadium ion concentration of electrolyte liquid；According to the anode electrolyte known
With the vanadium ion concentration situation of electrolyte liquid, corresponding electrolyte volume attenuation rate R is calculated；Further,
Draw the different state-of-charge SOC and both positive and negative polarity liquid level difference and electrolyte volume during charge-discharge test
Corresponding relation between attenuation rate, specifically, draws electrolyte volume attenuation rate R=(xi-SOC0)/(1-SOC0)+
yi/2L0, x hereiFor the state-of-charge SOC corresponding to electrolyte difference sampling moment i, (repeatedly cut-off is filled
Different SOC during discharge test), yiFor the both positive and negative polarity liquid level difference corresponding to electrolyte difference sampling moment i；
Referred to herein as initial state-of-charge SOC0Different SOC acquisition can lead to during charge-discharge test
Cross SOC detection means directly to obtain, master filed in 3 days November in 2014 of the applicant can also be passed through
Autograph is referred to as《Flow battery system state-of-charge monitoring method and its system》, Application No. 201410613631.0
Patent application document described in state-of-charge monitoring system carry out indirect gain；Anolyte of the present invention
Liquid refers to the electrolyte in anolyte liquid storage tank 3, and electrolyte liquid refers to cathode electrolyte storage tank 4
Interior electrolyte.
The stable regulation and control method of flow battery capacity, system and flow battery that the present invention is provided, can realize liquid
The on-line monitoring of the capacity attenuation degree of galvanic battery, and the difference of capacity attenuation degree is directed to, using regulation just
Electrolyte liquid liquid level difference and the different control measures of addition capacity restoration agent, it is ensured that the operation effect of flow battery
Rate, the simple intelligence of regulation and control, can delay flow battery capacity attenuation, realize that flow battery capacity and performance are long
Time keeps stable, and the present invention can be direct according to the situation of the flow battery running state parameter monitored
Go out current capacity attenuation rate, direct-on-line knows the capacity attenuation situation of flow battery, and avoids existing
The operation of flow battery must be suspended in technology to detect the capacity attenuation degree of flow battery, impact and be
Unite operational efficiency, the problem of monitoring inconvenience, while can be according to the different situations of capacity attenuation degree, respectively
Using different regulating strategies, specially when the current electrolyte volume attenuation rate of flow battery is optionally greater than second
During default attenuation rate, perform and institute's expense is added into anolyte liquid storage tank 3 and cathode electrolyte storage tank 4
Capacity restoration agent operation, the consumption of capacity restoration agent needed for it can be current according to flow battery
Electrolyte volume attenuation rate, and anode electrolyte, the volume of electrolyte liquid are calculated, specifically,
Assuming that current electrolyte volume attenuation rate is R0, the electrolyte volume in anolyte liquid storage tank 3 be L1、
Electrolyte volume in cathode electrolyte storage tank 4 is L2, then the consumption for needing increased capacity restoration agent isWherein Z is capacity restoration agent molecule amount, and M is active material total concentration, n0
N mol active material can be reduced for the agent of 1mol capacity restorations, specifically, when flow battery is full vanadium liquid
During galvanic battery, M is 1.65mol/L, and the addition of capacity restoration agent specifically can be by being arranged on anode electrolyte
Charge door 7 on storage tank 3 and cathode electrolyte storage tank 4 is added.
The present invention presets attenuation rate less than second when the current electrolyte volume attenuation rate of flow battery, simultaneously above
During equal to the first default attenuation rate, the liquid level of regulation anode electrolyte and electrolyte liquid makes positive pole electricity
The liquid level difference solved between liquid and electrolyte liquid is less than preset value, is specifically as follows：When the liquid of anode electrolyte
When face is highly higher than the liquid level of electrolyte liquid, the positive pole electricity of anolyte liquid storage tank 3 and pile is closed
The liquid transmission pipeline 1 between liquid outlet 61 is solved, while opening anode electrolyte outlet 61 and the negative pole of pile
Liquid transmission pipeline 1 between electrolyte storage tank 4；When the liquid level of electrolyte liquid is higher than anode electrolyte
Liquid level when, the liquid closed between the electrolyte liquid outlet 62 of cathode electrolyte storage tank 4 and pile
Transfer pipeline 1, while opening the liquid between the electrolyte liquid outlet 62 of pile and anolyte liquid storage tank 3
Body transfer pipeline 1, by setting up liquid transmission pipeline on the basis of flow battery in the prior art so that
The anode electrolyte come out from pile can return to cathode electrolyte storage tank 4, the electrolyte come out from pile
Liquid energy enough returns to anolyte liquid storage tank 3, it is not necessary to extra power assist apparatus, and is conducive to keeping liquid
Galvanic battery capacity and performance long-time stable.The present invention can also be by adjusting anode electrolyte and electrolyte
The liquid level of liquid, makes total vanadium ratio in anode electrolyte and electrolyte liquid be maintained at preset ratio scope,
Here preset ratio scope is 1：1.5~1：1.2.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention not office
Be limited to this, any one skilled in the art the invention discloses technical scope in, according to this
The technical scheme of invention and its inventive concept are subject to equivalent substitution or change, should all cover the protection in the present invention
Within the scope of.
Claims (10)
1. a kind of stable regulation and control method of flow battery capacity, it is characterised in that the stable regulation and control method bag of the capacity
Include following steps：
Step 1：Obtain the current electrolyte volume attenuation rate of flow battery；
Step 2：Whether the current electrolyte volume attenuation rate of flow battery is judged less than the first default attenuation rate,
It is then return to step 1, otherwise performs step 3；
Step 3：Whether the current electrolyte volume attenuation rate of flow battery is judged less than the second default attenuation rate,
It is then to perform step 4, otherwise performs step 5；
Step 4：The liquid level of anode electrolyte and electrolyte liquid is adjusted, makes anode electrolyte and negative electricity
Liquid level difference between solution liquid is less than total vanadium ratio in preset value or anode electrolyte and electrolyte liquid and is maintained at
Preset ratio scope；
Step 5：Desired amount of capacity restoration is added into anolyte liquid storage tank and cathode electrolyte storage tank
Agent.
2. the stable regulation and control method of flow battery capacity according to claim 1, it is characterised in that the step
Rapid 1 specifically includes following steps：
Step 11：Monitor flow battery running state parameter；
Step 12：According to the flow battery running state parameter monitored, shape is run with reference to the flow battery
Corresponding relation between state parameter and electrolyte volume attenuation rate, obtains the current electrolyte volume of flow battery
Attenuation rate.
3. the stable regulation and control method of flow battery capacity according to claim 2, it is characterised in that in step
Also there are following steps before 11：
Determine the corresponding relation between flow battery running state parameter and electrolyte volume attenuation rate and storage.
4. the stable regulation and control method of flow battery capacity according to claim 3, it is characterised in that described true
The corresponding relation step determined between flow battery running state parameter and electrolyte volume attenuation rate is specifically included：
Obtain initial flow battery running state parameter；
Charge-discharge test is carried out to flow battery, the different flow batteries operation during charge-discharge test is obtained
State parameter；
With change of the flow battery running state parameter during charge-discharge test, multiple positive pole electricity is carried out
Solve the sampling of liquid and electrolyte liquid, and know sampling anode electrolyte and electrolyte liquid vanadium ion it is dense
Degree；
According to the anode electrolyte and the vanadium ion concentration situation of electrolyte liquid known, corresponding electricity is calculated
Solve liquid capacity attenuation rate situation；
Draw the corresponding relation between flow battery running state parameter and electrolyte volume attenuation rate.
5. the stable regulation and control method of flow battery capacity according to claim 1, it is characterised in that according to liquid
The current electrolyte volume attenuation rate of galvanic battery, and anode electrolyte, the volume of electrolyte liquid, are calculated
The consumption of required capacity restoration agent.
6. a kind of stable regulator control system of flow battery capacity, it is characterised in that the stable regulator control system bag of the capacity
Include：
Obtain the acquiring unit of the current electrolyte volume attenuation rate of flow battery；
Acquiring unit is connected, for judging whether the current electrolyte volume attenuation rate of flow battery is pre- less than first
If the first judging unit of attenuation rate；
The first judging unit is connected, for being optionally greater than first when the current electrolyte volume attenuation rate of flow battery
During default attenuation rate, judge the current electrolyte volume attenuation rate of flow battery whether less than the second default decay
Second judging unit of rate；When the current electrolyte volume attenuation rate of flow battery is optionally greater than the second default decay
During rate, perform and desired amount of capacity restoration agent is added into anolyte liquid storage tank and cathode electrolyte storage tank
Operation；
The control unit of the second judging unit is connected, described control unit is used to work as the current electrolyte of flow battery
Capacity attenuation rate during simultaneously above equal to the first default attenuation rate, adjusts positive pole less than the second default attenuation rate
The liquid level of electrolyte and electrolyte liquid, makes the liquid level difference between anode electrolyte and electrolyte liquid small
Total vanadium ratio is maintained at preset ratio scope in preset value or anode electrolyte and electrolyte liquid.
7. the stable regulator control system of flow battery capacity according to claim 6, it is characterised in that the appearance
The stable regulator control system of amount also includes：
Monitoring unit for monitoring flow battery running state parameter；The acquiring unit is according to being monitored
Flow battery running state parameter, with reference to the flow battery running state parameter and electrolyte volume attenuation rate
Between corresponding relation, obtain the current electrolyte volume attenuation rate of flow battery.
8. a kind of flow battery, it is characterised in that the flow battery includes the liquid described in claim 6 or 7
The stable regulator control system of galvanic battery capacity.
9. flow battery according to claim 8, the flow battery includes：Pile, anolyte
Liquid storage tank, cathode electrolyte storage tank, liquid transmission pipeline and circulating pump；Anolyte liquid storage tank is through circulating pump
It is connected by liquid transmission pipeline with the anode electrolyte entrance of pile, the anode electrolyte outlet difference of pile
It is connected through liquid transmission pipeline with anolyte liquid storage tank and cathode electrolyte storage tank；Cathode electrolyte storage tank is passed through
Circulating pump is connected by liquid transmission pipeline with the electrolyte liquid entrance of pile, and the electrolyte liquid of pile goes out
Mouth is connected through liquid transmission pipeline with anolyte liquid storage tank and cathode electrolyte storage tank respectively；
Hold it is characterized in that being provided with the anolyte liquid storage tank and cathode electrolyte storage tank for adding
Measure the charge door of restorative.
10. flow battery according to claim 8, it is characterised in that the anolyte of the pile
Liquid exports anode electrolyte outlet and the negative pole of the liquid transmission pipeline, pile between anolyte liquid storage tank
Liquid transmission pipeline, pile between electrolyte storage tank electrolyte liquid outlet with anolyte liquid storage tank it
Between liquid transmission pipeline and pile electrolyte liquid outlet cathode electrolyte storage tank between liquid
The motor-driven valve for being turned on and off liquid transmission pipeline is provided with transfer pipeline；Described control unit is led to
Cross control the motor-driven valve working condition realize anode electrolyte and electrolyte liquid liquid level tune
Section.
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