CN108511779A - A kind of redox flow battery energy storage system - Google Patents
A kind of redox flow battery energy storage system Download PDFInfo
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- CN108511779A CN108511779A CN201810213410.2A CN201810213410A CN108511779A CN 108511779 A CN108511779 A CN 108511779A CN 201810213410 A CN201810213410 A CN 201810213410A CN 108511779 A CN108511779 A CN 108511779A
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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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- 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
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04186—Arrangements for control of reactant parameters, e.g. pressure or concentration of liquid-charged or electrolyte-charged reactants
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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
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
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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
- H01M8/04276—Arrangements for managing the electrolyte stream, e.g. heat exchange
- H01M8/04283—Supply means of electrolyte to or in matrix-fuel cells
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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
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
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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
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04388—Pressure; Ambient pressure; Flow of anode reactants at the inlet or inside the fuel cell
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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
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04395—Pressure; Ambient pressure; Flow of cathode reactants at the inlet or inside the fuel cell
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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
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04537—Electric variables
- H01M8/04544—Voltage
- H01M8/04552—Voltage of the individual fuel cell
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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
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04537—Electric variables
- H01M8/04604—Power, energy, capacity or load
- H01M8/04619—Power, energy, capacity or load of fuel cell stacks
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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
- H01M8/04955—Shut-off or shut-down of fuel cells
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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 redox flow battery energy storage systems, including rebalance cell, device for measuring degree of balance, device for measuring degree of balance is for measuring the flow battery intermediate ion degree of balance, when the flow battery intermediate ion degree of balance reaches default balance threshold values, start the work of electrolyte rebalance cell, rebalance cell restores the high-valence cationic in catholyte solution, so that the cation in catholyte solution is restored balance, the capacity of entire redox flow battery energy storage system is made to stablize.The present invention makes entire redox flow battery energy storage system capacity stabilization, safeguards system service life, also has voltage protection, improves safety and the stability of system.
Description
Technical field
The present invention relates to new energy field, more particularly to a kind of redox flow battery energy storage system.
Background technology
The electrochemical redox reaction system of flow battery has full vanadium V/V batteries (VRB), sodium polysulfide-bromine (NaSx/
Br) battery, zinc-chlorine (Zn/Cl2) or zinc-bromine (Zn/Br2) battery and iron-chromium (Fe/Cr) battery.Wherein, VRB and Fe/Cr liquid
Galvanic battery system positive and negative anodes are complete liquid-flow state, relative to other solid state batteries or single flow battery, are had bright
Aobvious superiority：Long lifespan, performance be stable, at low cost, flexible design, easy scale amplification, build without geographical restrictions, and
Securely and reliably.
Early in the Louis research center (Lewis of 70-80 20th century, US National Aeronautics and Space Administration age (NASA)
Research Center) a large amount of research just has been put into Fe/Cr battery systems, overcome the electrolyte solution of positive and negative electrode
The preparation of mixed questions and catalysis electrode critical component through dielectric film, has developed the battery energy storage system of 1kW, charge and discharge
The efficiency of battery is still 80% or more after electricity recycles 100 times.Technology property is transferred to commercial company later and prepares opening for product
Hair, but slowing down due to oil crisis, the said firm do not select further to be developed this technology.80 years 20th century
Northwest Utilities Electric Co. reports 10kW grades of battery system and is provided with 300 cycles under the later stage SUMITOMO CHEMICAL Co., Ltd. in generation
The performance of 80% transfer efficiency.May for a similar reason, Japan is not also in the work for continuing this respect later.With new
Energy source utilizing electricity generating techn growth requirement, the nearest system are paid attention in the U.S. and Spain, China again.Fe/ is started
The research and development of Cr flow battery systems and the Commercial Demonstration of technical products and application.
Obviously, in order to realize that the function of iron-chromium redox flow battery energy storage system, one of most important technology are the flow batteries
Energy-storage system technique.Energy-storage system is exactly to convert electrical energy into chemical energy to be stored in electrolyte solution, when then needing again
Chemical energy in electrolyte solution is converted back into electric energy and is discharged into power grid or external load.The effect of system process is just to provide
The reasonable conditions condition of iron-chromium flow battery system work, and realize security and stability control, safeguards system charge-discharge performance it is steady
It is qualitative.Energy-storage system technique, which includes main key equipment, liquid stream battery stack, the electrolyte solution circulatory system and system control
System is electrically and software.
As shown in Figure 1, traditional iron-chrome liquor galvanic battery is happened at recycle stream hydrodynamic in the redox reaction of positive and negative anodes
Solid state electrode surface in state aqueous phase solution, positive fluid are Fe2+/Fe3+Hydrochloride electrolyte solution, cathode fluid be Cr2 +/Cr3+Hydrochloride electrolyte solution, electrolyte solution is transported to by circulating pump by liquid stream battery stack from respective storage tank respectively
In the interior fifty-fifty battery cavities of positive and negative anodes, fluid reservoir is respectively flow back under fluid dynamic energy effect.
There are following technical problems for the system：
1, be formed by stacking by multipair battery unit due to liquid stream battery stack, the performance of battery unit can because various operating modes and
Difference on material causes different, there are problems that inconsistency, causes individual cells charging voltage excessively high and puts
Piezoelectric voltage is too low, and safety and stability is poor.
2, for full vanadium and iron-chrome liquor galvanic battery, the current potential of negative reaction is relatively low, and equilibrium potential is relative to standard hydrogen electrode
Respectively -0.26V and 0.41V.In this way in charging and in the case that overpotential is bigger than normal, has hydrogen in cathode and be precipitated, only
Be all-vanadium flow battery liberation of hydrogen degree it is smaller because liberation of hydrogen irreversible reaction occur, cause the loss of anode reactant, it is right
In all-vanadium flow battery be the loss of 4 valence vanadium；And it is the loss of divalent iron ion for iron-chrome liquor galvanic battery.Cause positive and negative anodes
The imbalance of ion concentration.Cause flow battery capacity unstable.
Invention content
In view of this, the present invention provides a kind of redox flow battery energy storage system, including rebalance cell, the degree of balance measure dress
It sets, device for measuring degree of balance is for measuring the flow battery intermediate ion degree of balance, when the flow battery intermediate ion degree of balance reaches default
When balancing threshold values, start the work of electrolyte rebalance cell, rebalance cell is by the high-valence cationic in catholyte solution
Reduction, makes the cation in catholyte solution restore balance, the capacity of entire redox flow battery energy storage system is made to stablize.
Further, including catholyte solution recycle system and the negative electrolyte solution circulatory system；
Catholyte solution recycle system include catholyte solution reservoir, first circulation pump, first flowmeter, just
Catholyte solution in the electrolyte solution storage tank of pole is pumped by first circulation in flow battery, rebalance cell, the degree of balance
It is recycled in measuring device, first flowmeter measures the flow of catholyte solution in the circulating cycle；
The negative electrolyte solution circulatory system includes negative electrolyte solution storage tank, second circulation pump, second flowmeter, is born
Negative electrolyte solution in the electrolyte solution storage tank of pole is pumped by second circulation to follow in flow battery, device for measuring degree of balance
Ring, second flowmeter measure the flow of negative electrolyte solution in the circulating cycle.
Further, including flow control valve, flow control valve enter rebalancing electricity for controlling catholyte solution
The flow in pond；When the flow battery intermediate ion degree of balance reaches default balance threshold values, flow control valve is opened.
Further, the hydrogen generated in negative electrolyte solution storage tank is inputted by pipeline in rebalance cell.
Further, including SOC measuring devices, SOC measuring devices are used to measure the level of charge in flow battery, anode
Electrolyte solution and negative electrolyte solution recycle in SOC measuring devices.
Further, including voltage protection switchs instrument, and voltage protection switchs electricity of the instrument to flow battery internal cell
Pressure measures；
In charging, the maximum charging voltage of battery unit is filtered out from each battery unit, controls maximum charging voltage
Not higher than charging voltage secure setting；
In electric discharge, the minimum discharge voltage of battery unit is filtered out from each battery unit, controls minimum discharge voltage
Not higher than discharge voltage secure setting.
Further, voltage protection switch instrument includes warning device, when maximum charging voltage is set safely higher than charging voltage
When definite value, or when minimum discharge voltage is higher than discharge voltage secure setting, warning device sends out alarm signal.
Further, flow battery is all-vanadium flow battery and iron or iron-chrome liquor galvanic battery.
A kind of redox flow battery energy storage system of the present invention has the advantages that：
1, rebalance cell and device for measuring degree of balance are increased in energy-storage system, when the flow battery intermediate ion degree of balance
When reaching default balance threshold values, start the work of electrolyte rebalance cell, rebalance cell is by the height in catholyte solution
Valence cation restores, and the vanadium of a part of 5 valences is reduced to the vanadium or Fe of 4 valences3+It is restored back to Fe2+, to balance it is each sun from
Sub- concentration, the capacity to reach entire energy-storage system return to original state, realize that its capacity is stablized relatively.
2, voltage protection switch instrument is increased in energy-storage system, voltage protection switch instrument, warning device are included patrol
Inspection, measurement, security settings, warning function, independent of the control of external whole energy-storage system, and the only state of external system
Input unit, can independent operating, therefore the operating status of external system nor affects on the dress even the state of communicating interrupt
The operation set and analysis, voltage protection switch instrument can directly be cut off according to the voltage status of measured each battery unit
Thoroughly protection flow battery, the key effect of safeguards system safe and stable operation are played in flow battery charge and discharge.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is existing redox flow battery energy storage system structural schematic diagram；
Fig. 2 is a kind of redox flow battery energy storage system structural schematic diagram of the present invention；
Fig. 3 is that the present invention switchs instrument energy-storage system stabilised efficiency figure with voltage protection；
Fig. 4 is that the present invention carries rebalance cell energy-storage system stabilised efficiency figure.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
SOC, full name are State ofCharge, charged state, are also remaining capacity, representative be that battery uses one section when
Between or it is long-term lie idle after residual capacity and the capacity of its fully charged state ratio, commonly use percentage and indicate.It takes
Value ranging from 0~1, indicates that battery discharge is complete as SOC=0, indicates that battery is completely filled with as SOC=1.
Anode refers to the electrode that oxidation reaction occurs, also referred to as positive in electrolytic cell, is in a fuel cell cathode.
Cathode refers to the electrode that reduction reaction occurs, and cathode is also referred to as in electrolytic cell, is in a fuel cell anode.
The high electrode of current potential is known as anode, and the low electrode of current potential is known as cathode.Anode, cathode definition not with electrolytic cell or
Fuel battery operation and change.
As shown in Fig. 2 to 3, a kind of preferred redox flow battery energy storage system of the present invention, including flow battery, catholyte
Solution recycle system, the negative electrolyte solution circulatory system, rebalance cell, device for measuring degree of balance, SOC measuring devices, stream
Control valve, device for measuring degree of balance is for measuring the flow battery intermediate ion degree of balance, and SOC measuring devices are for measuring liquid stream electricity
Level of charge in pond, flow control valve is for controlling the flow that catholyte solution enters rebalance cell.Anolyte
Matter solution recycle system includes catholyte solution reservoir, first circulation pump, first flowmeter, catholyte solution reservoir
In catholyte solution by first circulation pump flow battery, rebalance cell, device for measuring degree of balance, SOC measure
It is recycled in device, first flowmeter measures the flow of catholyte solution in the circulating cycle.Catholyte solution reservoir is
Fe3+/Fe2+NaOH solution tank NaOH.
The negative electrolyte solution circulatory system includes negative electrolyte solution storage tank, second circulation pump, second flowmeter, is born
Negative electrolyte solution in the electrolyte solution storage tank of pole is pumped by second circulation in flow battery, device for measuring degree of balance, SOC
It is recycled in measuring device, second flowmeter measures the flow of negative electrolyte solution in the circulating cycle.Negative electrolyte solution storage tank
The hydrogen of middle generation is inputted by pipeline in rebalance cell.
For iron network flow battery, catholyte solution reservoir is Fe3+/Fe2+NaOH solution tank NaOH, anolyte
Solution reservoir is Cr3+/Cr2+NaOH solution tank NaOH.
When the flow battery intermediate ion degree of balance reaches default balance threshold values, starts the work of electrolyte rebalance cell, beat
Open flow control valve.Rebalance cell restores the cation in catholyte solution.For all-vanadium flow battery, weight
The vanadium of a part of 5 valences is newly reduced to the vanadium of 4 valences.For iron-chrome liquor galvanic battery, again by a part of Fe3+It is restored back to
Fe2+, to balance each cation concn, the capacity to reach entire energy-storage system returns to original state, realizes its capacity phase
To stabilization.
In order to ensure energy-storage system safe and stable operation, voltage protection switch instrument, alarm dress are increased in energy-storage system
It sets, voltage protection switch instrument measures the voltage of flow battery internal cell；In charging, from each battery unit
The maximum charging voltage of battery unit is filtered out, control maximum charging voltage is not higher than charging voltage secure setting；It is discharging
When, the minimum discharge voltage of battery unit is filtered out from each battery unit, is controlled minimum discharge voltage and is not higher than discharge voltage
Secure setting.When maximum charging voltage is higher than charging voltage secure setting, or minimum discharge voltage is higher than electric discharge electricity
When pressing secure setting, warning device sends out alarm signal.
The voltage protection switchs instrument, warning device is included inspection, measurement, security settings, warning function, independent of outer
The control of portion's entirety energy-storage system, and the only status input unit of external system, can independent operating, therefore the fortune of external system
Row state nor affects on operation and the analysis of the device even the state of communicating interrupt, and voltage protection switchs instrument can be with
According to the direct cutting-off liquid flow battery charging and discharging of the voltage status of measured each battery unit, thoroughly protection flow battery is played,
The key effect of safeguards system safe and stable operation.
Embodiment 1：
All-vanadium flow battery energy-storage system has one, 20kW all-vanadium flow batteries heap, and the all-vanadium flow battery heap is by 2
Series connection, fluid circuit parallel connection are constituted on the sub- pile circuit of 10kW, and every sub- battery pile contains 30 pairs of battery units, then will configuration
The voltage channel number of voltage protection switch instrument is at least 60, compares and filters out maximum in charged state voltage that is, polarize
The voltage of most serious, the maximum voltage is not higher than charging voltage secure setting, usual 1.5V when control is charged；Similarly, and
When electric discharge, then compare the voltage for filtering out voltage minimum that is, the most serious that polarizes, minimum voltage is not less than and puts when control is discharged
Piezoelectric voltage secure setting, usual 0.85V.It is examined through test in 1000 hours, about 500 charge and discharge cycles, system safety and stability,
Preferably improve no-voltage security settings early period, the unstable situation of system stored energy performance, shown in See Figure 3.
Embodiment 2：
For a 2kW iron-chromium redox flow battery energy storage system, rebalance cell about 200W, rebalance cell electricity have been prepared
Pole reaction is as follows
Anode reacts
Negative reaction is
It is reacted using above-mentioned rebalance cell, default balance threshold values is offset in the electrolyte solution degree of balance of energy-storage system
When, 3~10% are normally set up, that is, starts rebalance cell and restores Fe3+Operation, maximum power be no more than 200W, the object of consumption
Matter is the hydrogen that cathode is precipitated, and hydrogen is restored in system, and does not need to stop the charge and discharge of main body battery
Operation.It can be made up completely because a small amount of liberation of hydrogen of flow battery cathode (single charge and discharge cycles energy loss is within 1%) is made
At Fe2+Loss, to maintain the stable operation of energy-storage system, as shown in Figure 4.
Meanwhile considering that the iron-chromium liquid stream battery stack is made of 40 pairs of battery units, then configure voltage protection switch instrument
Voltage channel number is at least 40, and battery unit maximum voltage is not higher than 1.25~1.35V when control is charged；And it is discharging
When, minimum voltage is not less than 0.5~0.7V when control is discharged.It is examined through test in 1600 hours, about 800 charge and discharge cycles, is
System safety and stability, shown in See Figure 4.
Technology not described above is the common knowledge of those skilled in the art.The foregoing is merely the preferable realities of the present invention
Apply example, be not intended to limit the invention, all within the spirits and principles of the present invention, made by it is any modification, equally replace
It changes, improve, should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of redox flow battery energy storage system, which is characterized in that including rebalance cell, device for measuring degree of balance, the degree of balance is surveyed
Amount device is for measuring the flow battery intermediate ion degree of balance, when the flow battery intermediate ion degree of balance reaches default balance threshold values,
Start the work of electrolyte rebalance cell, rebalance cell restores the high-valence cationic in catholyte solution, makes anode
Cation in electrolyte solution restores balance, and the capacity of entire redox flow battery energy storage system is made to stablize.
2. redox flow battery energy storage system according to claim 1, which is characterized in that including catholyte solution cyclic system
System and the negative electrolyte solution circulatory system；
Catholyte solution recycle system includes catholyte solution reservoir, first circulation pump, first flowmeter, anode electricity
Catholyte solution in electrolyte solution storage tank is pumped by first circulation to be measured in flow battery, rebalance cell, the degree of balance
It is recycled in device, first flowmeter measures the flow of catholyte solution in the circulating cycle；
The negative electrolyte solution circulatory system includes negative electrolyte solution storage tank, second circulation pump, second flowmeter, negative electricity
Negative electrolyte solution in electrolyte solution storage tank is pumped by second circulation to be recycled in flow battery, device for measuring degree of balance,
Second flowmeter measures the flow of negative electrolyte solution in the circulating cycle.
3. redox flow battery energy storage system according to claim 2, which is characterized in that including flow control valve, flow control
Valve is for controlling the flow that catholyte solution enters rebalance cell；When the flow battery intermediate ion degree of balance reaches default flat
When weighing apparatus threshold values, flow control valve is opened.
4. redox flow battery energy storage system according to claim 3, which is characterized in that generated in negative electrolyte solution storage tank
Hydrogen pass through pipeline input rebalance cell in.
5. redox flow battery energy storage system according to claim 2, which is characterized in that including SOC measuring devices, SOC is measured
Device is used to measure the level of charge in flow battery, and catholyte solution and negative electrolyte solution are in SOC measuring devices
Interior cycle.
6. according to the redox flow battery energy storage system described in claim 1 to 5 any one, which is characterized in that including voltage protection
Instrument is switched, voltage protection switch instrument measures the voltage of flow battery internal cell；
In charging, the maximum charging voltage of battery unit is filtered out from each battery unit, control maximum charging voltage is not high
In charging voltage secure setting；
In electric discharge, the minimum discharge voltage of battery unit is filtered out from each battery unit, and it is not high to control minimum discharge voltage
In discharge voltage secure setting.
7. redox flow battery energy storage system according to claim 6, which is characterized in that it includes that alarm fills that voltage protection, which switchs instrument,
It sets, when maximum charging voltage is higher than charging voltage secure setting, or minimum discharge voltage is set safely higher than discharge voltage
When definite value, warning device sends out alarm signal, and system is made to stop charge or discharge operation as needed in turn, avoids system event
Barrier further deteriorates.
8. according to the redox flow battery energy storage system described in claim 1 to 5 any one, which is characterized in that flow battery is complete
Vanadium flow battery or iron-chrome liquor galvanic battery.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109659588A (en) * | 2018-12-10 | 2019-04-19 | 合肥沃工电气自动化有限公司 | A kind of vanadium cell self-starting progress control method |
| CN111261889A (en) * | 2018-11-30 | 2020-06-09 | 中国科学院大连化学物理研究所 | Online recovery method for positive electrolyte of zinc-iron flow battery |
| CN112151840A (en) * | 2019-09-02 | 2020-12-29 | 国家电投集团科学技术研究院有限公司 | Hydrogen concentration control system for flow battery |
| CN112803046A (en) * | 2020-12-31 | 2021-05-14 | 大连融科储能装备有限公司 | Flow battery pile with built-in SOC battery |
| CN113270624A (en) * | 2021-04-14 | 2021-08-17 | 上海交通大学 | Flow battery subsystem with catalyst management and electrolyte capacity rebalancing |
| CN114263567A (en) * | 2021-12-08 | 2022-04-01 | 广东力恒新能源科技有限公司 | Iron-chromium liquid flow energy storage battery system |
| CN115128026A (en) * | 2022-08-31 | 2022-09-30 | 液流储能科技有限公司 | Method for testing balance degree of iron-chromium flow battery system |
| CN115133083A (en) * | 2022-08-31 | 2022-09-30 | 液流储能科技有限公司 | Method for testing balance degree of iron-chromium flow battery system |
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| CN114263567A (en) * | 2021-12-08 | 2022-04-01 | 广东力恒新能源科技有限公司 | Iron-chromium liquid flow energy storage battery system |
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| CN115133083A (en) * | 2022-08-31 | 2022-09-30 | 液流储能科技有限公司 | Method for testing balance degree of iron-chromium flow battery system |
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