CN116960408B - Electrolyte leveling and mixing system and method for all-vanadium redox flow battery - Google Patents
Electrolyte leveling and mixing system and method for all-vanadium redox flow battery Download PDFInfo
- Publication number
- CN116960408B CN116960408B CN202311221137.5A CN202311221137A CN116960408B CN 116960408 B CN116960408 B CN 116960408B CN 202311221137 A CN202311221137 A CN 202311221137A CN 116960408 B CN116960408 B CN 116960408B
- Authority
- CN
- China
- Prior art keywords
- liquid
- pipeline
- storage tank
- leveling
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002156 mixing Methods 0.000 title claims abstract description 89
- 239000003792 electrolyte Substances 0.000 title claims abstract description 72
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 330
- 238000001514 detection method Methods 0.000 claims abstract description 6
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910001456 vanadium ion Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/405—Methods of mixing liquids with liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fuel Cell (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
Abstract
The application relates to the application field of all-vanadium redox flow batteries, in particular to an all-vanadium redox flow battery electrolyte leveling and mixing system and a mixing method thereof, wherein the system comprises an anode liquid storage tank, a cathode liquid storage tank and a galvanic pile, the anode liquid storage tank and the galvanic pile form an electrolyte loop through pipelines, the cathode liquid storage tank and the galvanic pile are communicated to form the electrolyte loop through the pipelines, and the system further comprises a first leveling and mixing pipeline; the first leveling liquid mixing pipeline comprises a liquid mixing pipeline arranged at the liquid outlet ends of the first liquid return pipeline and the second liquid return pipeline, and the liquid mixing pipeline is connected with the negative electrode liquid storage tank; a second leveling liquid mixing pipeline; the second leveling mixed liquid pipeline comprises a liquid level balance pipeline arranged below the positive liquid storage tank and the negative liquid storage tank, and a potential detection element is arranged on the liquid level balance pipeline; the liquid mixing system and the liquid mixing method thereof disclosed by the application not only can solve the leveling problem of the positive electrolyte and the negative electrolyte in the prior art, but also can improve the mixing efficiency of the positive electrolyte and the negative electrolyte, and can also improve the service life of a valve in the whole battery.
Description
Technical Field
The application relates to the field of application of all-vanadium redox flow batteries, in particular to an electrolyte leveling and mixing system and a mixing method of an all-vanadium redox flow battery.
Background
Along with the 'double carbon' target becoming global consensus, the specific gravity of new energy in the whole energy system is rapidly increased, but the natural instability of wind power and photovoltaic power generation exists, and a corresponding energy storage system is required to be matched. The energy storage system of the all-vanadium redox flow battery in electrochemical energy storage has the unique technical advantages of independent design of capacity and power, high safety, long service life and the like, and is widely applied in recent years.
After the electrolyte is used as an energy storage unit of the all-vanadium redox flow battery and runs for a long time, the concentration, volume imbalance and the like of the positive and negative electrolyte are caused by the trans-membrane transportation of vanadium ions in the electrolyte, so that the capacity attenuation and the efficiency reduction of the electrolyte are caused. Therefore, the positive and negative electrolytes must be balanced by technical means.
Patent CN109546183A proposes a leveling and blending system and method for positive and negative electrolyte of an all-vanadium redox flow battery, and the concentration of the electrolyte is balanced by controlling the start and stop of a valve through a liquid level detector and a potential value. However, when the liquid is mixed, the flow rate of the electrolyte entering the positive electrode and the negative electrode can not be controlled, the liquid level imbalance of the electrolyte of the positive electrode and the liquid level imbalance of the electrolyte of the negative electrode still can be caused, the liquid mixing efficiency is reduced, in addition, the fatigue damage of structural parts can be caused by frequently opening the valve, and the service life is reduced. Therefore, the solution mixing method for the existing electrolyte cannot reach balance and has low efficiency, and the solution mixing method is a technical problem to be solved by the technicians in the field.
Disclosure of Invention
The application aims to provide an electrolyte leveling and mixing system and a mixing method for an all-vanadium redox flow battery, which are used for solving the problems existing in the prior art, not only can the problems of anode electrolyte and cathode electrolyte leveling in the prior art be solved, but also the mixing efficiency of the anode electrolyte and the cathode electrolyte can be improved, and meanwhile, the service life of a valve in the whole battery can be prolonged.
In order to achieve the above object, the present application provides the following solutions: the application provides an electrolyte leveling and mixing system of an all-vanadium redox flow battery, which comprises an anode liquid storage tank, a cathode liquid storage tank and a galvanic pile, wherein the anode liquid storage tank is communicated with the galvanic pile through a first pipeline and is used for conveying anode electrolyte to the galvanic pile, the cathode liquid storage tank is communicated with the galvanic pile through a fourth pipeline and is used for conveying cathode electrolyte to the galvanic pile, the galvanic pile is connected with the anode liquid storage tank through a first liquid return pipeline, the galvanic pile is connected with the cathode liquid storage tank through a second liquid return pipeline, and the first liquid return pipeline and the second liquid return pipeline are arranged to realize the circulating conveying of the anode electrolyte and the cathode electrolyte; the system also comprises a first leveling mixed liquid pipeline; the first leveling liquid mixing pipeline comprises a liquid mixing pipeline arranged at the liquid outlet ends of the first liquid return pipeline and the second liquid return pipeline, and the liquid mixing pipeline is connected with the negative electrode liquid storage tank;
a second leveling liquid mixing pipeline; the second leveling mixed liquid pipeline comprises a liquid level balance pipeline arranged below the positive liquid storage tank and the negative liquid storage tank, a potential detection element is arranged on the liquid level balance pipeline, and the mixed liquid pipeline and the liquid level balance pipeline are matched to realize double mixed liquid and leveling of liquid levels of the positive liquid storage tank and the negative liquid storage tank.
Preferably, the first liquid return pipeline comprises a second pipeline, a liquid outlet end of the second pipeline is connected with a seventh pipeline, the first liquid return pipeline further comprises a third pipeline end which is connected and communicated with the second pipeline, a first valve is arranged on the third pipeline, and the other end of the third pipeline is connected with the positive liquid storage tank;
the second liquid return pipeline comprises a fifth pipeline, a liquid outlet end of the fifth pipeline is connected with an eighth pipeline, and a liquid outlet pipe of the seventh pipeline and the eighth pipeline is connected with a liquid inlet end of the liquid mixing pipeline; the second liquid return pipeline further comprises one end of a sixth pipeline which is connected and communicated with the fifth pipeline, a second valve is installed on the sixth pipeline, and the other end of the sixth pipeline is connected with the negative electrode liquid storage tank.
Preferably, the seventh pipeline is provided with a third valve, and the eighth pipeline is provided with a fourth valve.
Preferably, a fifth valve is installed on one side of the liquid level balance pipeline close to the positive electrode liquid storage tank, and a sixth valve is installed on one side of the liquid level balance pipeline close to the negative electrode liquid storage tank.
Preferably, the potential detecting element is a potential sensor.
Preferably, an anode liquid level observation pipeline is arranged on the side wall of the anode liquid storage tank, and a cathode liquid level observation pipeline is arranged on the side wall of the cathode liquid storage tank.
Preferably, the positive liquid storage tank is provided with a positive liquid level sensor, and the negative liquid storage tank is provided with a negative liquid level sensor.
In order to achieve the above purpose, the present application also provides the following solutions: the method for leveling and mixing the electrolyte of the all-vanadium redox flow battery comprises the following steps of:
step one, calculating the ratio of discharge capacities: the discharge capacity Q per cycle is obtained through BMS, and the discharge capacity Q of the nth time is calculated n And the first discharge capacity Q 1 Ratio Q n / Q 1 ；
Calculating the volume and the difference of the liquid in the positive electrode liquid storage tank and the negative electrode liquid storage tank: the positive electrode liquid level sensor and the negative electrode liquid level sensor enable the liquid level BL of the positive electrode liquid storage tank and the liquid level BL of the negative electrode liquid storage tank to be controlled through electric signals Positive direction And BL (BL) Negative pole And the positive liquid storage tank and the negative liquid storage tank are transmitted to the BMS, and the BMS calculates and obtains the volume V of the positive liquid storage tank and the negative liquid storage tank Positive direction And V Negative pole And calculates the deviation value |V Positive direction -V Negative pole |；
Step three, leveling mixed liquid: when Q is n / Q 1 Is smaller than a preset value a and |V Positive direction -V Negative pole The I is larger than a preset value b, a first valve arranged on the first liquid return pipeline and a second valve arranged on the second liquid return pipeline are closed, and a third valve, a fourth valve, a fifth valve and a sixth valve are opened at the same time to enter a leveling and liquid mixing flow path;
step four, leveling mixed liquid is stopped: detecting that the potential value EP in the liquid level balance pipeline reaches a preset value c through the potential sensor, closing a third valve, a fourth valve, a fifth valve and a sixth valve, and simultaneously opening a first valve installed on the first liquid return pipeline and a second valve installed on the second liquid return pipeline;
and step five, entering the next charge-discharge cycle.
Preferably, the opening degrees of the third valve and the fourth valve in the third step are kept consistent; the opening degrees of the fifth valve and the sixth valve are kept consistent.
The application discloses the following technical effects: compared with the prior art, the application has the following technical effects:
(1) Compared with the leveling technology of the communicating pipe at the upper part of the liquid storage tank, the application avoids long-term contact of the positive and negative electrolytes during charge-discharge circulation, thereby reducing the self-discharge capacity loss, but the application is not affected by the self-discharge capacity loss;
(2) Compared with the leveling and blending technology of CN109546183A, the application improves the mixing efficiency of the positive and negative electrolyte;
(3) According to the application, double liquid mixing is carried out through the liquid mixing pipeline and the liquid level balancing pipeline, so that the accurate leveling can be realized, the liquid mixing efficiency can be improved, and the capacity recovery effect can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a leveling and mixing system according to the present application;
FIG. 2 is a flow chart of a method for leveling a liquid blend in accordance with the present application;
wherein, 1, pile; 2. a negative electrode liquid storage tank; 3. a positive electrode liquid storage tank; 4. a first pipe; 5. a second pipe; 6. a third conduit; 7. a fourth conduit; 8. a fifth pipe; 9. a sixth conduit; 10. a seventh pipe; 11. an eighth conduit; 12. a liquid mixing pipeline; 13. a liquid level balancing pipeline; 14. an anode liquid level observation pipeline; 15. a negative electrode liquid level observation pipeline; 16. a positive electrode pump; 17. a negative electrode pump; 18. a first valve; 19. a second valve; 20. a third valve; 21. a fourth valve; 22. a fifth valve; 23. a sixth valve; 24. a potential sensor; 25. an anode liquid level sensor; 26. a negative electrode liquid level sensor.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, the application provides an electrolyte leveling and mixing system of an all-vanadium redox flow battery, which comprises an anode liquid storage tank 3, a cathode liquid storage tank 2 and a galvanic pile 1, wherein the anode liquid storage tank 3 is communicated with the galvanic pile 1 through a first pipeline 4 and is used for conveying anode electrolyte to the galvanic pile 1, the cathode liquid storage tank 2 is communicated with the galvanic pile 1 through a fourth pipeline 7 and is used for conveying cathode electrolyte to the galvanic pile 1, the galvanic pile is connected with the anode liquid storage tank 3 through a first liquid return pipeline, the galvanic pile 1 is connected with the cathode liquid storage tank 2 through a second liquid return pipeline, and the first liquid return pipeline and the second liquid return pipeline are arranged so as to realize circulating conveying of the anode electrolyte and the cathode electrolyte; the system also comprises a first leveling mixed liquid pipeline; the first leveling liquid mixing pipeline comprises a liquid mixing pipeline 12 arranged at the liquid outlet ends of the first liquid return pipeline and the second liquid return pipeline, and the liquid mixing pipeline 12 is connected with the negative liquid storage tank 2;
a second leveling liquid mixing pipeline; the second leveling mixed liquid pipeline comprises a liquid level balance pipeline 13 arranged below the positive liquid storage tank 3 and the negative liquid storage tank 2, a potential detection element is arranged on the liquid level balance pipeline 13, and the mixed liquid pipeline 12 and the liquid level balance pipeline 13 are matched to realize double mixed liquid and leveling of the liquid levels of the positive liquid storage tank 3 and the negative liquid storage tank, wherein the potential detection element is a potential sensor 24.
Specifically, as shown in fig. 1, the first liquid return pipeline further comprises one end of a third pipeline 6 connected and communicated with the second pipeline 5, a first valve 18 is installed on the third pipeline 6, the other end of the third pipeline 6 is connected with the positive electrode liquid storage tank 3, the arrangement of the second pipeline 5 and the third pipeline 6 enables positive electrode electrolyte to form a loop, the second liquid return pipeline further comprises one end of a sixth pipeline 9 connected and communicated with the fifth pipeline 8, a second valve 19 is installed on the sixth pipeline 9, the other end of the sixth pipeline 9 is connected with the negative electrode liquid storage tank 2, and the arrangement of the fifth pipeline 8 and the sixth pipeline 9 enables negative electrode electrolyte to form a loop; in order to enable positive and negative electrolyte to smoothly enter the electric pile 1, a positive electrode pump 16 is arranged on the first pipeline 4, a negative electrode pump 17 is arranged on the fourth pipeline 7, a positive electrode liquid level sensor 25 is arranged on the positive electrode liquid storage tank 3, and a negative electrode liquid level sensor 26 is arranged on the negative electrode liquid storage tank 2.
Further optimizing scheme, first liquid return pipeline includes second pipeline 5, and the play liquid end of second pipeline 5 is connected with seventh pipeline 10, and second liquid return pipeline includes fifth pipeline 8, and the play liquid end of fifth pipeline 8 is connected with eighth pipeline 11, and seventh pipeline 10 is connected with the drain pipe of eighth pipeline 11 and the feed liquor end of mixed liquid pipeline 12.
Further, the seventh pipe 10 is provided with a third valve 20, and the eighth pipe 11 is provided with a fourth valve 21.
Still further, a fifth valve 22 is installed on the side of the liquid level balancing pipeline 13 close to the positive electrode liquid storage tank 3, and a sixth valve 23 is installed on the side of the liquid level balancing pipeline 13 close to the negative electrode liquid storage tank 2, wherein the first valve 18, the second valve 19, the third valve 20, the fourth valve 21, the fifth valve 22 and the sixth valve 23 are adjustable electromagnetic valves.
Specifically, as shown in fig. 1, when the positive and negative electrolyte leveling and mixing are performed, whether leveling and mixing are performed is controlled by detecting the battery capacity attenuation proportion and the liquid level difference of the positive liquid storage tank 3 and the negative liquid storage tank 2, when the two values meet the specified requirements, the first valve 18 and the second valve 19 are controlled to be closed firstly, the third valve 20, the fourth valve 21, the fifth valve 22 and the sixth valve 23 are opened simultaneously, then the positive and negative electrolyte in the galvanic pile 1 is respectively fed into the mixed liquid pipeline 12 through the second pipeline 5, the third pipeline 6, the fifth pipeline 8 and the sixth pipeline 9 for mixing, and then fed into the negative liquid storage tank 2, and simultaneously, because the fifth valve 22 and the sixth valve 23 are in an open state, the positive liquid storage tank 3 and the negative liquid storage tank 2 are in a communication state, and then the liquid levels in the two tanks can be automatically leveled, and simultaneously mixed liquid can be performed in the liquid level balancing pipeline 13, thus not only can be realized, simultaneously, the automatic leveling efficiency of the mixed liquid can be improved, the mixed liquid pipeline 12 and the liquid level can be automatically leveled, and the liquid level of the mixed liquid can be well can be automatically leveled, and the fatigue of the leveling pipeline 13 can not be guaranteed, and the fatigue phenomenon can be realized only due to the fact that the leveling of the leveling and the liquid level of the mixed pipeline is not be guaranteed, but also can be realized in the accurate leveling mode due to the fact that the realization of the valve is required to be used; according to the application, through the matching of the liquid mixing pipeline 12 and the liquid level balancing pipeline 13, the valve can automatically level after being opened once, and meanwhile, the positive and negative electrolyte can be mixed doubly, so that the liquid mixing efficiency is improved, the leveling precision can be ensured, and the service life of a structural member is prolonged; compared with the leveling and blending technology of CN109546183A, the application improves the mixing efficiency of the positive and negative electrolyte; the method comprises the following steps:
(1) in MW/GW level energy storage system application, residual electrolyte in the electric pile accounts for 10% -15% of the total amount of the electrolyte, a liquid mixing pipeline is arranged in the liquid end of the electric pile, and the residual electrolyte in the electric pile is fully mixed;
(2) electrolyte with the bottoms lower than the liquid inlet of the positive electrode pump and the negative electrode pump is filled in the bottom of the positive electrode liquid storage tank and the bottom of the negative electrode liquid storage tank, and the electrolyte accounts for 12% -15% of the total amount of the electrolyte, so that the electrolyte can be fully mixed through a liquid level balance pipeline;
(3) in the liquid mixing operation process, the liquid level balance pipelines are arranged at the bottoms of the positive liquid storage tank and the negative liquid storage tank to carry out real-time leveling by utilizing the communicating pipe principle, so that frequent adjustment of the valve due to unbalanced flow is avoided, the use of structural parts is reduced, and the service life is prolonged;
(4) the liquid level difference of the positive and negative electrode liquid storage tanks only reflects the deviation of the electrolyte, the deviation is usually an empirical value, and the liquid mixing time cannot be accurately judged. The battery capacity attenuation proportion and the liquid level difference of the positive and negative liquid storage tanks are controlled together to serve as precondition of leveling and liquid mixing, and invalid leveling and liquid mixing are avoided.
Further optimizing scheme, in order to can observe the liquid level in anodal liquid storage pot 3 and the negative pole liquid storage pot 2, be provided with anodal liquid level observation pipeline 14 on the lateral wall of anodal liquid storage pot 3, be provided with negative pole liquid level observation pipeline 15 on the lateral wall of negative pole liquid storage pot 2, wherein negative pole liquid storage pot 2 can be respectively the rigid coupling on the lateral wall of anodal liquid storage pot 3 and negative pole liquid storage pot 2, also can the lock joint on it, anodal liquid level observation pipeline 14 and negative pole liquid level observation pipeline 15 can be transparent structure, and in order to observe its liquid level value, also can etch the scale value on anodal liquid level observation pipeline 14 and negative pole liquid level observation pipeline 15, in order to observe its liquid level value conveniently and directly perceivedly.
Referring to fig. 2, the application further provides a method for leveling and mixing electrolyte of an all-vanadium redox flow battery, which uses the system for leveling and mixing electrolyte of the all-vanadium redox flow battery, and comprises the following steps:
step one, calculating the ratio of discharge capacities: the discharge capacity Q per cycle is obtained by BMS (Battery System), and the nth discharge capacity Q is calculated n And the first discharge capacity Q 1 Ratio Q n / Q 1 ；
Step two, calculating the volume and the difference value of the liquid in the positive liquid storage tank 3 and the negative liquid storage tank 2: the liquid level BL of the positive liquid level sensor 25 and the liquid level BL of the negative liquid level sensor 26 are used for driving the liquid level BL of the positive liquid storage tank 3 and the liquid level BL of the negative liquid storage tank 2 through electric signals Positive direction And BL (BL) Negative pole And the positive electrode liquid storage tank 3 and the negative electrode liquid storage tank 2 are transmitted to the BMS, and the BMS calculates and obtains the volume V of the positive electrode liquid storage tank 2 and the negative electrode liquid storage tank Positive direction And V Negative pole And calculates the deviation value |V Positive direction -V Negative pole |；
Step three, leveling mixed liquid: when Q is n / Q 1 Is smaller than a preset value a and |V Positive direction -V Negative pole The I is larger than a preset value b, a first valve 18 arranged on a first liquid return pipeline and a second valve 19 arranged on a second liquid return pipeline are closed, a third valve 20, a fourth valve 21, a fifth valve 22 and a sixth valve 23 are opened simultaneously, leveling and liquid mixing processes are started, and in order to ensure the accuracy of leveling liquid mixture, the opening degree of the third valve 20 and the opening degree of the fourth valve 21 in the third step are kept consistent; the opening degrees of the fifth valve 22 and the sixth valve 23 are kept consistent;
step four, leveling mixed liquid is stopped: detecting that the potential value EP in the liquid level balance pipe 13 reaches a preset value c by a potential sensor 24, closing a third valve 20, a fourth valve 21, a fifth valve 22 and a sixth valve 23, and simultaneously opening a first valve 18 installed on a first liquid return pipeline and a second valve 19 installed on a second liquid return pipeline;
and step five, entering the next charge-discharge cycle.
The application has the following using effects: after the all-vanadium redox flow battery is used for a period of time, the volumes of the liquid in the positive electrode liquid storage tank 3 and the negative electrode liquid storage tank 2 are different, so that electrolyte in the all-vanadium redox flow battery needs to be leveled and mixed, the ratio of the first charging energy to the theoretical energy after the mixing is 85% after the leveling by using the existing leveling system, and the ratio of the first charging energy to the theoretical energy after the mixing is 92% after the mixing is leveled according to the steps; meanwhile, the ratio of the first discharge energy to the theoretical energy after mixing the liquid in the existing leveling system is also lower than that after using the leveling system, which can be specifically that the ratio of the first discharge energy to the theoretical energy after mixing the liquid in the existing leveling system is 72%, and the ratio of the first discharge energy to the theoretical energy after mixing the liquid in the leveling system is 78%; therefore, the leveling liquid mixing system disclosed by the application can realize accurate leveling, can improve liquid mixing efficiency and achieves the capacity recovery effect. When the volume deviation of the liquid in the positive electrode liquid storage tank 3 and the negative electrode liquid storage tank 2 reaches a certain value during the use of the all-vanadium redox flow battery, the leveling liquid mixing system mixes liquid, and after the first liquid mixing, the liquid mixing is carried out again after a period of time, if the secondary liquid mixing and the first liquid mixing of the leveling system in the prior art are subjected to the interval circulation times of 503 times, the interval circulation times of the secondary liquid mixing and the first liquid mixing of the leveling liquid mixing system in the application are 610 times, and compared with the leveling and blending technology of CN109546183A, the leveling liquid mixing system can fully find that the efficiency of the positive electrode electrolyte and the negative electrode electrolyte is improved, and the capacity recovery and the use of the all-vanadium redox flow battery are more facilitated.
In the description of the present application, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
The foregoing embodiments are merely illustrative of the preferred embodiments of the present application, and the scope of the present application is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present application pertains are made without departing from the spirit of the present application, and all changes and modifications and improvements fall within the scope of the present application as defined in the appended claims.
Claims (8)
1. The utility model provides an all vanadium redox flow battery electrolyte leveling mixes liquid system, includes positive pole liquid storage pot (3), negative pole liquid storage pot (2) and pile (1), positive pole liquid storage pot (3) through first pipeline (4) with pile (1) communicate and to pile (1) carry positive pole electrolyte, negative pole liquid storage pot (2) through fourth pipeline (7) with pile (1) communicate and to pile (1) carry negative pole electrolyte, pile (1) with positive pole liquid storage pot (3) are through first return liquid piping connection, pile (1) with negative pole liquid storage pot (2) are through second return liquid piping connection, first return liquid piping and second return liquid piping set up in order to realize the circulation of positive pole electrolyte and negative pole electrolyte and carry; the method is characterized in that: the system also comprises a first leveling mixed liquid pipeline; the first leveling liquid mixing pipeline comprises a liquid mixing pipeline (12) arranged at the liquid outlet ends of the first liquid return pipeline and the second liquid return pipeline, and the liquid mixing pipeline (12) is connected with the negative liquid storage tank (2);
a second leveling liquid mixing pipeline; the second leveling mixed liquid pipeline comprises a liquid level balance pipeline (13) arranged below the positive liquid storage tank (3) and the negative liquid storage tank (2), a potential detection element is arranged on the liquid level balance pipeline (13), and the mixed liquid pipeline (12) and the liquid level balance pipeline (13) are matched to realize double mixed liquid and leveling of liquid levels of the positive liquid storage tank (3) and the negative liquid storage tank;
the first liquid return pipeline comprises a second pipeline (5), a liquid outlet end of the second pipeline (5) is connected with a seventh pipeline (10), the first liquid return pipeline further comprises one end of a third pipeline (6) which is connected and communicated with the second pipeline (5), a first valve (18) is arranged on the third pipeline (6), and the other end of the third pipeline (6) is connected with the positive liquid storage tank (3); the second liquid return pipeline comprises a fifth pipeline (8), a liquid outlet end of the fifth pipeline (8) is connected with an eighth pipeline (11), and a liquid outlet pipe of the seventh pipeline (10) and the eighth pipeline (11) is connected with a liquid inlet end of the liquid mixing pipeline (12); the second liquid return pipeline further comprises one end of a sixth pipeline (9) which is connected and communicated with the fifth pipeline (8), a second valve (19) is installed on the sixth pipeline (9), and the other end of the sixth pipeline (9) is connected with the negative electrode liquid storage tank (2).
2. The all-vanadium redox flow battery electrolyte leveling and mixing system according to claim 1, wherein: and a third valve (20) is arranged on the seventh pipeline (10), and a fourth valve (21) is arranged on the eighth pipeline (11).
3. The all-vanadium redox flow battery electrolyte leveling and mixing system according to claim 2, wherein: a fifth valve (22) is arranged on one side of the liquid level balance pipeline (13) close to the positive electrode liquid storage tank (3), and a sixth valve (23) is arranged on one side of the liquid level balance pipeline (13) close to the negative electrode liquid storage tank (2).
4. The all-vanadium redox flow battery electrolyte leveling and mixing system according to claim 1, wherein: the potential detection element is a potential sensor (24).
5. The all-vanadium redox flow battery electrolyte leveling and mixing system according to claim 1, wherein: an anode liquid level observation pipeline (14) is arranged on the side wall of the anode liquid storage tank (3), and a cathode liquid level observation pipeline (15) is arranged on the side wall of the cathode liquid storage tank (2).
6. The all-vanadium redox flow battery electrolyte leveling and mixing system according to claim 3, wherein: the positive liquid storage tank (3) is provided with a positive liquid level sensor (25), and the negative liquid storage tank (2) is provided with a negative liquid level sensor (26).
7. A leveling and mixing method for electrolyte of an all-vanadium redox flow battery is characterized by comprising the following steps of: the electrolyte leveling and mixing system for the all-vanadium redox flow battery, which is disclosed in claim 6, comprises the following leveling and mixing steps:
step one, calculating the ratio of discharge capacities: the discharge capacity Q per cycle is obtained through BMS, and the discharge capacity Q of the nth time is calculated n And the first discharge capacity Q 1 Ratio Q n /Q 1 ；
Calculating the volumes and the differences of the liquid in the positive liquid storage tank (3) and the negative liquid storage tank (2): the positive electrode liquid level sensor (25) and the negative electrode liquid level sensor (26) are used for enabling the liquid levels BL of the positive electrode liquid storage tank (3) and the negative electrode liquid storage tank (2) to be controlled through electric signals Positive direction And BL (BL) Negative pole The positive electrode liquid storage tank (3) and the negative electrode liquid storage tank (2) are transmitted to the BMS, and the BMS calculates and obtains the volume V of the positive electrode liquid storage tank (3) and the negative electrode liquid storage tank (2) Positive direction And V Negative pole And calculates the deviation value |V Positive direction -V Negative pole |；
Step three, leveling mixed liquid: when Q is n /Q 1 Is smaller than a preset value a and |V Positive direction -V Negative pole The I is larger than a preset value b, a first valve (18) arranged on the first liquid return pipeline and a second valve (19) arranged on the second liquid return pipeline are closed, and a third valve (20), a fourth valve (21), a fifth valve (22) and a sixth valve (23) are opened at the same time, so that the leveling and liquid mixing flow is started;
step four, leveling mixed liquid is stopped: detecting that the potential value EP in the liquid level balance pipeline (13) reaches a preset value c through the potential sensor (24), closing a third valve (20), a fourth valve (21), a fifth valve (22) and a sixth valve (23), and simultaneously opening a first valve (18) installed on the first liquid return pipeline and a second valve (19) installed on the second liquid return pipeline;
and step five, entering the next charge-discharge cycle.
8. The electrolyte leveling and mixing method for the all-vanadium redox flow battery according to claim 7, wherein the method comprises the following steps of: the opening degrees of the third valve (20) and the fourth valve (21) in the third step are kept consistent; the opening degree of the fifth valve (22) and the opening degree of the sixth valve (23) are kept consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311221137.5A CN116960408B (en) | 2023-09-21 | 2023-09-21 | Electrolyte leveling and mixing system and method for all-vanadium redox flow battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311221137.5A CN116960408B (en) | 2023-09-21 | 2023-09-21 | Electrolyte leveling and mixing system and method for all-vanadium redox flow battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116960408A CN116960408A (en) | 2023-10-27 |
| CN116960408B true CN116960408B (en) | 2023-12-01 |
Family
ID=88462475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311221137.5A Active CN116960408B (en) | 2023-09-21 | 2023-09-21 | Electrolyte leveling and mixing system and method for all-vanadium redox flow battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116960408B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007188729A (en) * | 2006-01-12 | 2007-07-26 | Sumitomo Electric Ind Ltd | Method of regenerating vanadium redox flow battery |
| CN103199285A (en) * | 2013-04-10 | 2013-07-10 | 大连融科储能技术发展有限公司 | Liquid flow battery halt protection method and liquid flow battery system |
| CN104143646A (en) * | 2013-05-09 | 2014-11-12 | 中国科学院大连化学物理研究所 | Flow energy storage cell or pile running method |
| EP2824746A1 (en) * | 2013-07-11 | 2015-01-14 | OCI Company Ltd. | Redox flow battery system and control method for the same |
| CN104900892A (en) * | 2014-03-03 | 2015-09-09 | 大连融科储能技术发展有限公司 | Flow battery negative electrolyte solution sealing system and flow battery system |
| CN105572594A (en) * | 2014-11-03 | 2016-05-11 | 大连融科储能技术发展有限公司 | Flow battery system state of charge monitoring method and system |
| CN109546183A (en) * | 2018-11-26 | 2019-03-29 | 上海电气集团股份有限公司 | A kind of leveling blending system and method for all-vanadium flow battery positive and negative electrode electrolyte |
| CN109713350A (en) * | 2018-12-26 | 2019-05-03 | 湖南钒谷新能源技术有限公司 | The vanadium cell system of included electrolytic cell and the rebalancing method of vanadium cell liquid |
| EP3522281A1 (en) * | 2017-02-10 | 2019-08-07 | LG Chem, Ltd. | Method and device for recycling electrolyte of flow battery |
| CN112928313A (en) * | 2021-01-28 | 2021-06-08 | 湖南钒谷新能源技术有限公司 | Electrolyte linkage adjusting method and system for vanadium battery system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6414463B2 (en) * | 2014-12-22 | 2018-10-31 | 住友電気工業株式会社 | Redox flow battery operating method and redox flow battery system |
| US10320023B2 (en) * | 2017-02-16 | 2019-06-11 | Lockheed Martin Energy, Llc | Neat methods for forming titanium catecholate complexes and associated compositions |
| WO2018183301A1 (en) * | 2017-03-27 | 2018-10-04 | Danzi Angelo | An advanced electrolyte mixing method for all vanadium flow batteries |
| CN110574201B (en) * | 2017-04-28 | 2023-10-31 | Ess技术有限公司 | Flow battery cleaning cycle to maintain electrolyte health and system performance |
-
2023
- 2023-09-21 CN CN202311221137.5A patent/CN116960408B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007188729A (en) * | 2006-01-12 | 2007-07-26 | Sumitomo Electric Ind Ltd | Method of regenerating vanadium redox flow battery |
| CN103199285A (en) * | 2013-04-10 | 2013-07-10 | 大连融科储能技术发展有限公司 | Liquid flow battery halt protection method and liquid flow battery system |
| CN104143646A (en) * | 2013-05-09 | 2014-11-12 | 中国科学院大连化学物理研究所 | Flow energy storage cell or pile running method |
| EP2824746A1 (en) * | 2013-07-11 | 2015-01-14 | OCI Company Ltd. | Redox flow battery system and control method for the same |
| CN104900892A (en) * | 2014-03-03 | 2015-09-09 | 大连融科储能技术发展有限公司 | Flow battery negative electrolyte solution sealing system and flow battery system |
| CN105572594A (en) * | 2014-11-03 | 2016-05-11 | 大连融科储能技术发展有限公司 | Flow battery system state of charge monitoring method and system |
| EP3522281A1 (en) * | 2017-02-10 | 2019-08-07 | LG Chem, Ltd. | Method and device for recycling electrolyte of flow battery |
| CN109546183A (en) * | 2018-11-26 | 2019-03-29 | 上海电气集团股份有限公司 | A kind of leveling blending system and method for all-vanadium flow battery positive and negative electrode electrolyte |
| CN109713350A (en) * | 2018-12-26 | 2019-05-03 | 湖南钒谷新能源技术有限公司 | The vanadium cell system of included electrolytic cell and the rebalancing method of vanadium cell liquid |
| CN112928313A (en) * | 2021-01-28 | 2021-06-08 | 湖南钒谷新能源技术有限公司 | Electrolyte linkage adjusting method and system for vanadium battery system |
Non-Patent Citations (1)
| Title |
|---|
| 面向高可用能量容量的全钒液流电池结构设计及运行策略优化研究;刘柏辰;《中国优秀硕士学位论文全文数据库》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116960408A (en) | 2023-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109546183B (en) | Leveling blending system and method for positive and negative electrolytes of all-vanadium redox flow battery | |
| CN110048147B (en) | All-vanadium redox flow battery pipeline system with liquid mixing function | |
| CN112928313B (en) | Electrolyte linkage adjusting method and system for vanadium battery system | |
| CN107195931B (en) | Online determination method and system for capacity attenuation of flow battery, capacity attenuation regulation method and system | |
| CN110071315B (en) | Method and system for controlling mixed electrolyte of flow battery energy storage system | |
| CN103762377A (en) | Vanadium redox battery and electrolyte rebalancing method thereof | |
| JP2011119283A (en) | Redox flow battery and method of operating the same | |
| CN102290588A (en) | Flow cell system and control method and device thereof | |
| CN109713350A (en) | The vanadium cell system of included electrolytic cell and the rebalancing method of vanadium cell liquid | |
| CN106356551A (en) | All-vanadium redox flow battery system for efficient energy storage | |
| CN114566683B (en) | Multifunctional zinc-bromine flow battery pile testing device and testing method thereof | |
| CN107204480A (en) | Fluid cell electrolyte parameter determination method and its system, flow battery | |
| CN116960408B (en) | Electrolyte leveling and mixing system and method for all-vanadium redox flow battery | |
| CN209087993U (en) | The vanadium cell system of included electrolytic cell | |
| CN107195932B (en) | Method and system for stably regulating and controlling capacity of flow battery and flow battery | |
| CN207426029U (en) | A kind of flow battery pulsed charge-discharge system for improving electrolyte utilization rate | |
| CN109713339A (en) | A kind of flow battery system control method based on electric current optimisation strategy | |
| CN117476974A (en) | Real-time detection compensation method and system for all-vanadium redox flow battery | |
| TW201911635A (en) | Redox flow battery operation method and redox flow battery | |
| CN107959038A (en) | A kind of flow battery pulsed charge-discharge system and method for improving electrolyte utilization rate | |
| CN114899460B (en) | Electrolyte vanadium concentration regulation and control method and device of all-vanadium liquid flow energy storage system | |
| CN108183254B (en) | Energy-saving vanadium battery capable of improving battery stability | |
| CN207398271U (en) | Electrolyte suction apparatus and the electrolyte storage tank for including it | |
| CN207896214U (en) | Vanadium cell energy saving and that stability test can be improved | |
| JP2020187939A (en) | Redox flow battery system and operating method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |