CN106229536B - Electrolyte balancing device and flow battery with same - Google Patents
Electrolyte balancing device and flow battery with same Download PDFInfo
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- CN106229536B CN106229536B CN201610795605.3A CN201610795605A CN106229536B CN 106229536 B CN106229536 B CN 106229536B CN 201610795605 A CN201610795605 A CN 201610795605A CN 106229536 B CN106229536 B CN 106229536B
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- liquid storage
- storage tank
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- pipe
- water
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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
-
- 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
-
- 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 provides an electrolyte balancing device and a flow battery with the same, wherein the electrolyte balancing device comprises: the communication pipeline is used for being arranged between the first liquid storage tank and the second liquid storage tank of the flow battery so as to communicate the first liquid storage tank with the second liquid storage tank; the water exchange component is arranged in the communication pipeline and is used for communicating water in the first liquid storage tank and the second liquid storage tank and isolating electrolyte ions in the first liquid storage tank and the second liquid storage tank; by applying the electrolyte balancing device of the technical scheme of the invention, the gradual unbalance of the volumes of the positive electrolyte and the negative electrolyte caused by water migration in the long-term use process of the flow battery can be prevented, and the problem of battery performance attenuation caused by electrolyte unbalance in the long-term operation process of the all-vanadium redox flow battery in the prior art is solved.
Description
Technical Field
The invention relates to the field of flow batteries, in particular to an electrolyte balancing device and a flow battery with the same.
Background
The flow battery is a novel electrochemical energy storage system, and compared with other energy storage technologies, the flow battery has the advantages of high power, large capacity, high energy conversion efficiency, long service life, high safety, environmental friendliness and the like, and has wide application prospects in the fields of renewable energy source matched energy storage, intelligent power grid peak shaving, communication base stations, distributed power sources and the like.
All-vanadium redox flow batteries are one of the flow batteries, and the principle is to store and utilize energy by utilizing redox reactions among vanadium ions in different valence states. As shown in fig. 1, unlike conventional chemical batteries such as lead-acid batteries and lithium batteries, the reactant electrolyte of the vanadium battery is independently stored in an external liquid storage tank 1, and during charge and discharge, the electrolyte is input into the battery stack 3 through an acid-resistant liquid pump 2 to perform electrochemical reaction, and the electrolyte after the reaction returns to the liquid storage tank 1, so that a closed circulating liquid flow loop is formed.
However, in the long-term cyclic charge and discharge process of the vanadium battery, due to various side reactions and diffusion of vanadium ion permeable membranes, positive and negative electrolyte solutions are gradually unbalanced and serious water migration occurs, so that the electrolyte volumes in the positive and negative liquid storage tanks are unbalanced, the system performance is continuously attenuated, and great difficulty is brought to system control.
Disclosure of Invention
The invention mainly aims to provide an electrolyte balancing device and a flow battery with the same, so as to solve the problem that in the prior art, electrolyte is unbalanced in the long-term operation process of an all-vanadium redox flow battery, so that the battery performance is attenuated.
In order to achieve the above object, according to one aspect of the present invention, there is provided an electrolyte balancing apparatus comprising: the communication pipeline is used for being arranged between the first liquid storage tank and the second liquid storage tank of the flow battery so as to communicate the first liquid storage tank with the second liquid storage tank; and the water exchange component is arranged in the communication pipeline and is used for communicating water in the first liquid storage tank and the second liquid storage tank and isolating electrolyte ions in the first liquid storage tank and the second liquid storage tank.
Further, the communication pipeline includes: communicating pipe, one end of communicating pipe is used for communicating with first reservoir, and the other end of communicating pipe is used for communicating with second reservoir, and water exchange component sets up in communicating pipe in order to separate the lumen of communicating pipe into two sections.
Further, the electrolyte balancing device further includes: the first control valve is arranged on the communicating pipe and is arranged on a pipe section between the water exchange part of the communicating pipe and the first liquid storage tank.
Further, the electrolyte balancing device further includes: and the second control valve is arranged on the pipe section between the water exchange part of the communicating pipe and the second liquid storage tank.
Further, the water exchange member is a water exchange membrane.
Further, the communication pipeline includes: a crossover tank having a first port for communicating with the first reservoir and a second port for communicating with the second reservoir; the water exchange member is disposed within the exchange tank to isolate the first port from the second port.
Further, the communication pipeline further comprises a first branch pipe, one end of the first branch pipe is communicated with the first through hole, and the other end of the first branch pipe is communicated with the first liquid storage tank.
Further, the first branch pipes are multiple, and each first branch pipe is provided with a first control valve.
Further, the communication pipeline further comprises a second branch pipe, one end of the second branch pipe is communicated with the second port, and the other end of the second branch pipe is communicated with the second liquid storage tank.
Further, the second branch pipes are multiple, and each second branch pipe is provided with a second control valve.
Further, the water exchange component is a water exchange membrane, the water exchange membrane divides the cavity of the exchange box into a first cavity and a second cavity, the first through hole is communicated with the first cavity, and the second through hole is communicated with the second cavity.
Further, the water exchange component is an exchange tube, two first through holes are formed, one end of the exchange tube is communicated with one first through hole, the other end of the exchange tube is communicated with the other first through hole, and the second through hole is communicated with the cavity of the exchange box.
Further, the water exchange member is made of a selectively permeable material.
According to another aspect of the present invention, there is provided a flow battery comprising a first liquid storage tank and a second liquid storage tank, the flow battery further comprising: the electrolyte balancing device is the electrolyte balancing device, one end of a communicating pipeline of the electrolyte balancing device is communicated with the first liquid storage tank, and the other end of the communicating pipeline is communicated with the second liquid storage tank.
By using the electrolyte balancing device of the technical scheme, the first liquid storage tank and the second liquid storage tank of the flow battery are communicated through the communication pipeline, the water exchange component is arranged in the communication pipeline and is used for communicating water in the first liquid storage tank and the second liquid storage tank and isolating electrolyte ions in the first liquid storage tank and the second liquid storage tank. Therefore, the method can prevent the volume of the positive electrode electrolyte and the negative electrode electrolyte from being unbalanced gradually due to water migration in the long-term use process of the flow battery, and solves the problem of battery performance attenuation caused by electrolyte unbalance in the long-term operation process of the all-vanadium redox flow battery in the prior art.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a flow battery of the prior art;
FIG. 2 is a schematic view of an alternative arrangement of an electrolyte balance device on a flow battery according to an embodiment of the invention;
FIG. 3 is a schematic view of an alternative arrangement of an electrolyte balance device on a flow battery according to an embodiment of the invention; and
FIG. 4 is a schematic view of an arrangement of an optional third electrolyte balancing device on a flow battery according to an embodiment of the invention; and
fig. 5 is a schematic cross-sectional structure of the water exchanger and the exchange chamber of fig. 4.
Wherein the above figures include the following reference numerals:
10. a water exchanging part; 20. a first liquid storage tank; 30. a second liquid storage tank; 40. a communicating pipe; 41. a first branch pipe; 42. a second branch pipe; 50. a first control valve; 60. a second control valve; 70. and a switching box.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
According to an embodiment of the present invention, as shown in fig. 2, an electrolyte balancing apparatus includes: a communication pipe and a water exchanging part 10, the communication pipe being used for being installed between a first liquid storage tank 20 and a second liquid storage tank 30 of the flow battery to communicate the first liquid storage tank 20 and the second liquid storage tank 30; the water exchanging element 10 is disposed in the communication pipeline for communicating the water in the first and second liquid storage tanks 20 and 30 and isolating the electrolyte ions in the first and second liquid storage tanks 20 and 30.
According to the electrolyte balancing device, the first liquid storage tank 20 and the second liquid storage tank 30 of the flow battery are communicated through the communication pipeline, the water exchange component 10 is arranged in the communication pipeline, and the water exchange component 10 is used for communicating moisture in the first liquid storage tank 20 and the second liquid storage tank 30 and isolating electrolyte ions in the first liquid storage tank 20 and the second liquid storage tank 30. Therefore, the method can prevent the volume of the positive electrode electrolyte and the negative electrode electrolyte from being unbalanced gradually due to water migration in the long-term use process of the flow battery, and solves the problem of battery performance attenuation caused by electrolyte unbalance in the long-term operation process of the all-vanadium redox flow battery in the prior art.
The following describes the embodiments of the present invention in detail with reference to specific examples:
example 1:
in this embodiment, as shown in fig. 2, optionally, the communication pipeline includes: and a communicating pipe 40, one end of the communicating pipe 40 being communicated with the first liquid storage tank 20, the other end of the communicating pipe 40 being communicated with the second liquid storage tank 30, and the water exchanging element 10 being provided in the communicating pipe 40 to divide a lumen of the communicating pipe 40 into two sections.
Alternatively, the water exchanging element 10 is a water exchanging diaphragm in the form of a raw sheet, which is matched with the cross section of the communicating tube 40, and is provided in the communicating tube 40 in the cross section direction of the communicating tube 40, thereby isolating the first liquid storage tank 20 from the second liquid storage tank 30.
The water exchange membrane not only can allow water between the first liquid storage tank 20 and the second liquid storage tank 30 to flow freely, but also can prevent electrolyte ions in the first liquid storage tank 20 and the second liquid storage tank 30 from flowing mutually, so that the water exchange membrane plays a role in balancing water when the first liquid storage tank 20 and the second liquid storage tank 30 migrate, and the balance of the electrolyte in the first liquid storage tank 20 and the second liquid storage tank 30 is ensured.
Alternatively, the material of the water exchange membrane is a permselective material capable of allowing free passage of water molecules, while electrolyte ions are difficult to pass. The types of selectively permeable materials include, but are not limited to, one or more of cation exchange resins, anion exchange resins, zwitterionic exchange resins, microporous materials, such as Nafion (r) from DuPont, flemion, daramic membrane (r) from Asahi, japan, sulfonated polyethersulfones, sulfonated polyetherketones, sulfonated polyimides, sulfonated polyaryletherketones, and sulfonated polyarylethersulfones, among others.
In order to effectively control the water exchanging process, optionally, a first control valve 50 and a second control valve 60 are installed on the communication pipe 40, the first control valve 50 is disposed on a pipe section between the water exchanging part 10 and the first liquid storage tank 20, the second control valve 60 is disposed on a pipe section between the water exchanging part 10 and the second liquid storage tank 30 of the communication pipe 40, and the water exchanging process of the first liquid storage tank 20 and the second liquid storage tank 30 can be separately controlled by providing the first control valve 50 and the second control valve 60, respectively.
Example 2:
as shown in fig. 3, this embodiment differs from embodiment 1 in that the communication pipe includes: a tank 70, the tank 70 having a first port communicating with the first reservoir 20 and a second port communicating with the second reservoir 30; the water exchanging element 10 is arranged in the exchanging box 70 to isolate the first port from the second port.
Optionally, the water exchange component 10 is a water exchange membrane matched with the cross section of the exchange tank 70, the water exchange membrane is arranged along the cross section direction of the exchange tank 70 to divide the exchange tank 70 into a first chamber and a second chamber with equal volumes, the first through hole is communicated with the first chamber, and the second through hole is communicated with the second chamber so as to isolate the first liquid storage tank 20 from the second liquid storage tank 30, thereby playing a role in balancing water when the first liquid storage tank 20 and the second liquid storage tank 30 undergo water migration, and guaranteeing balance of electrolyte in the first liquid storage tank 20 and the second liquid storage tank 30.
Alternatively, the material of the water exchange membrane is a permselective material capable of allowing free passage of water molecules, while electrolyte ions are difficult to pass. The types of selectively permeable materials include, but are not limited to, one or more of cation exchange resins, anion exchange resins, zwitterionic exchange resins, microporous materials, such as Nafion (r) from DuPont, flemion, daramic membrane (r) from Asahi, japan, sulfonated polyethersulfones, sulfonated polyetherketones, sulfonated polyimides, sulfonated polyaryletherketones, and sulfonated polyarylethersulfones, among others.
In order to facilitate communication between the first port of the exchange tank 70 and the first reservoir 20, a first branch pipe 41 may be optionally provided between the first port of the exchange tank 70 and the first reservoir 20, one end of the first branch pipe 41 being in communication with the first port, and the other end of the first branch pipe 41 being in communication with the first reservoir 20.
Accordingly, in order to enable the second port of the exchange tank 70 to be easily communicated with the second liquid storage tank 30, a second branch pipe 42 is provided between the second port of the exchange tank 70 and the second liquid storage tank 30, one end of the second branch pipe 42 is communicated with the second port, and the other end of the second branch pipe 42 is communicated with the second liquid storage tank 30. Communication between the first tank 20 and the second tank 30 and the tank 70 can be facilitated by providing the first branch pipe 41 and the second branch pipe 42.
In order to ensure the flow rate of water exchange, the first branch pipe 41 and the second branch pipe 42 are each provided with a plurality of, and the water exchange capacity between the first liquid storage tank 20 and the second liquid storage tank 30 can be enhanced by providing a plurality of first branch pipes 41 and a plurality of second branch pipes 42.
For effective control of the water exchange process, a first control valve 50 is installed on each first branch pipe 41, and a second control valve 60 is installed on each second branch pipe 42. The water exchange processes of the first tank 20 and the second tank 30 can be individually controlled by providing the first control valve 50 and the second control valve 60 on the first branch pipe 41 and the second branch pipe 42, respectively.
Example 3:
as shown in fig. 4, this embodiment is different from embodiment 2 in that the water exchanging element 10 is a plurality of exchanging pipes, as shown in fig. 4 and 5, provided in the exchanging box 70, extending in the longitudinal direction of the exchanging box 70. The exchange box 70 is provided with two first through openings, the two first through openings are respectively positioned at two ends of the exchange box 70, one end of each exchange tube is respectively communicated with one of the first through openings, the other end of each exchange tube is respectively communicated with the other first through opening, and the two first through openings are communicated with the first liquid storage tank 20 through two first branch pipes 41, so that the inner cavity of each exchange tube is communicated with the first liquid storage tank 20.
The side wall of the exchange box 70 is also provided with two second ports, which are communicated with the cavity of the exchange box 70, and the two second ports are communicated with the second liquid storage tank 30 through two second branch pipes 42, so that the cavity of the exchange box 70 is communicated with the second liquid storage tank 30. The first and second fluid tanks 20, 30 are isolated from each other by a crossover tube made of selectively permeable material. Alternatively, the tube type of the exchange tube includes, but is not limited to, straight tube, serpentine tube, U-shaped tube, and the like.
Optionally, the water exchange membrane is made of a selectively permeable material, which can allow water molecules to pass freely, but electrolyte ions are difficult to pass, so that the water exchange membrane plays a role in balancing water when the first liquid storage tank 20 and the second liquid storage tank 30 undergo water migration, and the balance of the electrolyte in the first liquid storage tank 20 and the second liquid storage tank 30 is ensured.
Alternatively, the types of selectively permeable materials include, but are not limited to, one or more of cation exchange resins, anion exchange resins, zwitterionic exchange resins, microporous materials, such as Nafion from DuPont, flemion, daramic membrane from Asahi, japan, sulfonated polyethersulfone, sulfonated polyetherketone, sulfonated polyimide, sulfonated polyaryletherketone, and sulfonated polyarylethersulfone, among others.
The present invention also provides a flow battery comprising a first fluid reservoir 20 and a second fluid reservoir 30, the flow battery further comprising: the electrolyte balancing device is the electrolyte balancing device of the above embodiment, one end of a communicating pipeline of the electrolyte balancing device is communicated with the first liquid storage tank 20, and the other end of the communicating pipeline is communicated with the second liquid storage tank 30.
The flow battery applying the electrolyte balancing device of the above embodiment is provided with a communication pipeline for communicating the first liquid storage tank 20 and the second liquid storage tank 30 of the flow battery, a water exchange component 10 is arranged in the communication pipeline, and the water exchange component 10 is used for communicating moisture in the first liquid storage tank 20 and the second liquid storage tank 30 and isolating electrolyte ions in the first liquid storage tank 20 and the second liquid storage tank 30. Therefore, the method can prevent the volume of the positive electrode electrolyte and the negative electrode electrolyte from being unbalanced gradually due to water migration in the long-term use process of the flow battery, and solves the problem of battery performance attenuation caused by electrolyte unbalance in the long-term operation process of the all-vanadium redox flow battery in the prior art.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. An electrolyte balancing device, comprising:
a communication pipeline which is used for being arranged between a first liquid storage tank (20) and a second liquid storage tank (30) of the flow battery so as to communicate the first liquid storage tank (20) with the second liquid storage tank (30);
the water exchange component (10) is arranged in the communication pipeline and is used for communicating the water in the first liquid storage tank (20) and the second liquid storage tank (30) and isolating electrolyte ions in the first liquid storage tank (20) and the second liquid storage tank (30).
2. The electrolyte balancing apparatus according to claim 1, wherein the communication pipe includes:
communicating pipe (40), communicating pipe (40) one end be used for with first liquid storage pot (20) intercommunication, communicating pipe (40) the other end be used for with second liquid storage pot (30) intercommunication, water exchange component (10) set up in communicating pipe (40) with the lumen of communicating pipe (40) is divided into two sections.
3. The electrolyte balancing device of claim 2, further comprising:
a first control valve (50) mounted on the communication pipe (40), the first control valve (50) being provided on a pipe section between the water exchanging element (10) of the communication pipe (40) and the first liquid storage tank (20).
4. The electrolyte balancing device of claim 3, further comprising:
and a second control valve (60) mounted on the communication pipe (40), the second control valve (60) being provided on a pipe section between the water exchanging element (10) of the communication pipe (40) and the second liquid storage tank (30).
5. Electrolyte balancing device according to claim 2, characterized in that the water exchange means (10) is a water exchange membrane.
6. The electrolyte balancing apparatus according to claim 1, wherein the communication pipe includes:
-a tank (70), said tank (70) having a first port for communication with said first reservoir (20) and a second port for communication with said second reservoir (30); the water exchange member (10) is disposed within the exchange box (70) to isolate the first port from the second port.
7. The electrolyte balancing apparatus according to claim 6, wherein the communication pipe further includes a first branch pipe (41), one end of the first branch pipe (41) communicates with the first port, and the other end of the first branch pipe (41) communicates with the first reservoir (20).
8. The electrolyte balancing apparatus according to claim 7, wherein the first branch pipes (41) are plural, and each first branch pipe (41) is provided with a first control valve (50).
9. The electrolyte balancing apparatus according to claim 6, wherein the communication pipe further includes a second branch pipe (42), one end of the second branch pipe (42) communicates with the second port, and the other end of the second branch pipe (42) communicates with the second reservoir tank (30).
10. The electrolyte balancing apparatus according to claim 9, wherein the second branch pipes (42) are plural, and each second branch pipe (42) is provided with a second control valve (60).
11. The electrolyte balancing device according to claim 6, wherein the water exchange member (10) is a water exchange membrane dividing the chamber of the exchange tank (70) into a first chamber and a second chamber, the first port being in communication with the first chamber and the second port being in communication with the second chamber.
12. The electrolyte balancing apparatus according to claim 6, wherein the water exchanging element (10) is an exchanging tube, the number of the first ports is two, one end of the exchanging tube is communicated with one of the first ports, the other end of the exchanging tube is communicated with the other of the first ports, and the second port is communicated with the cavity of the exchanging box (70).
13. Electrolyte balancing device according to one of claims 1 to 12, characterized in that the water exchange component (10) is made of a permselective material.
14. A flow battery comprising a first fluid reservoir (20) and a second fluid reservoir (30), the flow battery further comprising: electrolyte balancing device according to any one of claims 1 to 12, wherein one end of a communication pipeline of the electrolyte balancing device is communicated with the first liquid storage tank (20), and the other end of the communication pipeline is communicated with the second liquid storage tank (30).
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| CN201610795605.3A CN106229536B (en) | 2016-08-31 | 2016-08-31 | Electrolyte balancing device and flow battery with same |
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| CN201610795605.3A CN106229536B (en) | 2016-08-31 | 2016-08-31 | Electrolyte balancing device and flow battery with same |
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| CN106229536B true CN106229536B (en) | 2023-07-28 |
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| GB2571558B (en) * | 2018-03-01 | 2023-01-04 | Invinity Energy Systems Ireland Ltd | Means for maintaining desired liquid level between inter-connected tanks |
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Effective date of registration: 20200821 Address after: 610097 No. 18 Xixin Avenue, Chengdu High-tech Zone, Sichuan Province Applicant after: Dongfang Electric (Chengdu) Hydrogen Fuel Cell Technology Co.,Ltd. Address before: 611731, No. 18, West core road, hi tech West District, Sichuan, Chengdu Applicant before: DONGFANG ELECTRIC Corp. |
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