KR102187257B1 - Redox flow battery - Google Patents

Abstract

The present invention relates to a redox flow battery. In the redox flow battery comprising: a separator and a battery cell having positive and negative electrodes provided on both sides of the separator; and an electrolyte supply unit for supplying an electrolyte to the battery cell, the electrolyte supply unit, the A supply tank for storing the electrolyte supplied to the battery cell; A supply passage connecting the supply tank and the battery cell; A first pressure transfer unit configured to apply pressure to the electrolyte stored in the supply tank to flow the electrolyte into the battery cell through the supply passage; A recovery tank in which the electrolyte solution discharged after circulating inside the battery cell is recovered; An air flow passage connecting the battery cell and the recovery tank; A filling passage connecting the recovery tank and the supply tank; And a second pressure transfer unit configured to apply pressure to the electrolyte stored in the recovery tank to flow the electrolyte into the supply tank through the filling passage.

Description

Redox flow battery

The present invention relates to a redox flow battery, and in particular, a redox flow battery that minimizes flow resistance generated during circulation of the electrolyte to facilitate circulation of the electrolyte, improve the efficiency of the battery, and simplify the overall structure. About.

Renewable energy such as solar energy and wind energy is in the spotlight as a method for suppressing greenhouse gas emission, which is a major cause of global warming in recent years. A lot of research is being conducted for their commercialization and dissemination. However, renewable energy is greatly affected by the location environment or natural conditions, and furthermore, renewable energy has a disadvantage in that it cannot supply energy continuously because the output fluctuates severely.

Therefore, in order to use renewable energy for home or commercial use, a system that can store energy when the output is high and use the stored energy when the output is low is introduced and used.

A large-capacity secondary battery is used as such an energy storage system. For example, large-capacity secondary battery storage systems are being introduced in large-scale solar and wind farms. Secondary batteries for large-capacity power storage include lead-acid batteries, sodium sulfide (NaS) batteries, lithium batteries, or redox flow batteries (RFBs).

Since the redox flow battery can operate at room temperature and can independently design capacity and output, many studies have recently been conducted as a large-capacity secondary battery. Similar to a fuel cell, the redox flow cell has a function of a secondary battery capable of charging and discharging electric energy by being configured by arranging a separator (membrane), an electrode, and a bipolar plate in series.

In the redox flow battery, positive and negative electrodes are disposed on both sides of the separator, a positive electrolyte storage tank and a negative electrolyte storage tank supplying electrolyte to the positive and negative electrodes are provided, respectively, in the positive electrolyte storage tank and the negative electrolyte storage tank. As the supplied electrolyte circulates, ion exchange is performed, and in this process, electrons are moved to perform charging and discharging. Such a redox flow battery is suitable as an EES (Energy storage system) because it has a longer life than the existing secondary battery and can be manufactured as a medium-sized system of kw to mw class.

However, the redox flow battery must be provided separately to install a positive electrolyte storage tank and a negative electrolyte storage tank for storing positive and negative electrolytes. For example, a predetermined space should be provided on both sides of a stack (a structure in which a plurality of anodes and cathodes are disposed on both sides of a separator) or an electrolyte tank is disposed. In addition, a plurality of electrolyte circulation pipes connecting the stack and the electrolyte storage tank should be provided, and if the circulation pipe is lengthened, the required capacity of the pump increases, thereby increasing the volume and manufacturing cost.

In addition, the conventional redox flow battery uses a pump to circulate the electrolyte, but there is a problem in that the efficiency of the entire system is deteriorated because the process of introducing the electrolyte into the pump is not smoothly performed. In order to supply smoothly, a separate suction device may be installed to induce the inflow of the electrolyte, but this complicates the pumping system because an additional device must be installed, and there is a disadvantage of causing inconvenience and cost of installation.

Korean Patent Registration No. 10-0647422

The present invention has been devised to improve the above-described problems, and minimizes the flow resistance generated during the circulation of the electrolyte to facilitate circulation of the electrolyte, improve the efficiency of the battery, and simplify the overall structure. Its purpose is to provide a dox flow battery.

A redox flow battery according to the present invention comprises: a separator and a battery cell having positive and negative electrodes on both sides of the separator; and an electrolyte supply unit supplying an electrolyte to the battery cell, wherein the electrolyte is supplied. Part is a supply tank for storing the electrolyte supplied to the battery cell; A supply passage connecting the supply tank and the battery cell; A first pressure transfer unit configured to apply pressure to the electrolyte stored in the supply tank to flow the electrolyte into the battery cell through the supply passage; A recovery tank in which the electrolyte solution discharged after circulating inside the battery cell is recovered; An air flow passage connecting the battery cell and the recovery tank; A filling passage connecting the recovery tank and the supply tank; And a second pressure transmitting unit configured to apply pressure to the electrolyte stored in the recovery tank to flow the electrolyte to the supply tank through the filling passage.

In addition, it is preferable that the filling passage is provided with a reverse flow prevention port for preventing reverse flow of the electrolyte.

In addition, it is preferable that the return flow path is provided with a reverse flow prevention port for preventing reverse flow of the electrolyte.

In addition, two or more electrolyte supply units are provided, and when the electrolyte is supplied to the battery cell through at least one of the electrolyte supply units, the remaining electrolyte supply unit fills the electrolyte solution from the recovery tank to the supply tank. It is desirable to do.

In addition, it is preferable that each supply tank of the electrolyte supply unit is connected to the battery cell by a separate supply channel.

In addition, it is preferable that the respective supply passages extending from the respective supply tanks are merged before being introduced into the battery cells to form a common passage.

In addition, the supply tank or the recovery tank is selected from rubber, fluorocarbon rubber, polyolefin-based resin, olefin-based polyethylene (PE), chlorinated polyethylene, polypropylene, alkanes-based solid wax, or polyvinyl chloride-based resin. It is preferably made of a material.

In addition, it is preferable that a plurality of the first pressure transmission units or the second pressure transmission units are provided.

In addition, it is preferable to include a fluid filter for removing foreign substances contained in the electrolyte.

In addition, it is preferable that the supply tank or the recovery tank include an oxygen absorbing device for absorbing oxygen or an oxygen supply device for supplying oxygen to control the oxidation number of the electrolyte.

In addition, when the internal pressure of the battery cell or the electrolyte supply unit is greater than or equal to a predetermined pressure, it is preferable to provide a pressure reducing device for reducing the pressure.

In addition, the supply tank or the recovery tank is expandable and contractable so that the internal volume thereof is variable, and the first pressure transfer unit or the second pressure transfer unit expands and contracts the supply tank or the recovery tank to transfer pressure to the electrolyte. desirable.

In addition, the supply tank includes a first variable portion having a variable internal volume, and a first extension portion extending from the first variable portion and having no internal volume change and to which the filling passage is coupled, and the recovery tank has an internal volume. It is preferable to include a second variable portion that is variable, and a second extension portion extending from the second variable portion and having no internal volume change and to which the filling passage is coupled.

The redox flow battery according to the present invention simplifies the overall structure of the redox flow battery by minimizing the flow resistance generated when the electrolyte is circulating to facilitate circulation of the electrolyte and improves the efficiency of the battery, and dramatically improves productivity. Provides a lethal effect.

1 is a view schematically showing a redox flow battery according to an embodiment of the present invention;
Figure 2 is a view showing the operation when the electrolyte flows into the battery cell.
3 is a view showing the operation when the electrolyte moves from the recovery tank to the supply tank.
4 is a block diagram of a redox flow battery according to an embodiment of the present invention;
5 is a view schematically showing a redox flow battery according to another embodiment of the present invention;
6 is a view schematically showing a redox flow battery according to another embodiment of the present invention,
7 is a diagram schematically showing a redox flow battery according to another embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described in connection with the accompanying drawings. Various embodiments of the present invention may be modified in various ways and may have various embodiments. Specific embodiments are illustrated in the drawings and detailed descriptions thereof are provided. However, this is not intended to limit the various embodiments of the present invention to specific embodiments, and it should be understood that all changes and/or equivalents or substitutes included in the spirit and scope of the various embodiments of the present invention are included. In connection with the description of the drawings, similar reference numerals have been used for similar elements.

Expressions such as "include" or "may include" that may be used in various embodiments of the present invention indicate the existence of a corresponding function, operation, or component that has been disclosed, and an additional one or more functions, operations, or It does not limit components, etc. In addition, in various embodiments of the present invention, terms such as "include" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, It is to be understood that it does not preclude the possibility of the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

When it is mentioned that a component is "connected" to another component, the component may be directly connected to the other component, but a new other component between the component and the other component. It should be understood that may exist. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it will be understood that no new other component exists between the component and the other component. Should be able to

The terms used in various embodiments of the present invention are only used to describe a specific embodiment, and are not intended to limit the various embodiments of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless otherwise defined, all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by a person of ordinary skill in the art to which various embodiments of the present invention belong.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in various embodiments of the present invention, ideal or excessively formal It is not interpreted in meaning.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a redox flow battery according to an embodiment of the present invention. Figure 2 is a view showing the operation when the electrolyte flows into the battery cell, Figure 3 is a view showing the operation when the electrolyte is moved from the recovery tank to the supply tank, Figure 4 is a level according to an embodiment of the present invention. It is a block diagram of a Dox flow battery.

First, referring to FIG. 1, a redox flow battery 100 according to an embodiment of the present invention includes a battery cell 10 and an electrolyte supply unit 20.

The battery cell 10 is a minimum unit in which charging and discharging occurs through an electrolyte solution, and the separator 13 and the anode 11 disposed on both sides of the separator 13 so that charging and discharging occurs while ion exchange occurs. , A negative electrode 12, may be configured to include a separation plate 14. Since the configuration of the battery cell 10 itself is based on a known configuration, a detailed description thereof will be omitted.

The electrolyte supply unit 20 is provided to supply the electrolyte solution to the battery cell 10. According to this embodiment, the electrolyte supply unit 20 is implemented in a form of supplying an electrolyte to both the positive electrode 11 and the negative electrode 12 of the battery cell 10. Of course, it is not excluded that the electrolyte supply unit 20 is implemented in the form of supplying an electrolyte to either of the anode 11 or the cathode 12.

Hereinafter, a case where the electrolyte solution supply unit 20 supplies the electrolyte solution to the anode 11 will be described as an example. The configuration or operation of the electrolyte supply unit 20 supplying the electrolyte solution to the cathode 12 is the same as the configuration or operation of supplying the electrolyte solution to the anode 11.

Specifically, the electrolyte supply unit 20 includes a supply tank 21, a supply channel 22, a first pressure transfer unit 23, a recovery tank 24, a return channel 25, a filling channel 26, and It includes a second pressure transmission unit (27).

The supply tank 21 stores the electrolyte solution supplied to the battery cell 10. The supply passage 22 connects the supply tank 21 and the battery cell 10 and provides a passage through which the electrolyte solution flows.

According to this embodiment, the supply tank 21 is rubber, fluorocarbon rubber, polyolefin-based resin, olefin-based polyethylene (PE), chlorinated polyethylene, polypropene, alkanes-based solid wax, or polyvinyl chloride-based It is made of a material selected from resins. The material is a material resistant to chemical solutions and prevents the inside of the supply tank 21 from being corroded by the electrolyte. Meanwhile, the inner wall surface of the supply tank 21 may be coated using a chemical resistant coating agent, and the coating agent may be selected from a silicon compound, a boron compound, or an aluminum compound.

The first pressure transfer part 23 is provided to apply pressure to the electrolyte stored in the supply tank 21 to flow the electrolyte into the battery cell 10. The electrolyte solution flows into the battery cell 10 through the supply passage 22 by the first pressure transfer unit 23.

The first pressure transfer unit 23 directly or indirectly provides pressure to the electrolyte so that the electrolyte moves from the supply tank 21 toward the battery cell 10. For example, the first pressure transmission unit 23 may employ a pneumatic pump, an electric pump, or a hydraulic pump, or may be implemented in a structure in which pressure is indirectly applied to the electrolyte, as in the embodiment of FIG. 7.

As shown in Fig. 1, according to the present embodiment, one first pressure transmitting unit 23 for transmitting pressure to the electrolyte stored in the supply tank 21 is provided, but a plurality of first pressure transmitting units 23 may be implemented to be connected to the supply tank 21 to transmit pressure to the electrolyte. When a plurality of first pressure transfer units 23 are provided, it is possible to transfer the electrolyte solution having a larger flow rate, and to transfer the electrolyte solution quickly.

The recovery tank 24 is provided to recover the electrolyte that has been circulated inside the battery cell 10 and discharged. The return flow path 25 connects the battery cell 10 and the recovery tank 24 and provides a flow path through which an electrolyte flows from the battery cell 10 to the recovery tank 24.

The material of the recovery tank 24 may be made of the same material as that of the supply tank 21. Of course, the inner wall surface of the recovery tank 24 may be coated with a chemical resistant coating agent like the supply tank 21. The coating agent may be selected from a silicon compound, a boron compound, or an aluminum compound.

The filling passage 26 connects the recovery tank 24 and the supply tank 21. The second pressure transfer part 27 is provided to apply pressure to the electrolyte stored in the recovery tank 24 to flow the electrolyte into the supply tank 21. The electrolyte solution flows from the recovery tank 24 to the supply tank 21 through the filling passage 26 by the second pressure transfer unit 27. The second pressure transmission unit 27 may be implemented by substantially the same configuration as the first pressure transmission unit 23.

According to this embodiment, one second pressure transfer unit 27 is provided to transfer pressure to the electrolyte stored in the recovery tank 24, but a plurality of second pressure transfer units 27 It may be implemented to be connected to the tank 24 to transmit pressure to the electrolyte.

With this configuration, the electrolyte is circulated while flowing back to the supply tank 21 after sequentially passing through the supply tank 21, the battery cell 10, and the recovery tank 24.

The redox flow battery according to the present embodiment is provided with a reverse flow prevention port 30 for preventing reverse flow of the electrolyte. The backflow prevention device 30 suffices to perform the function of allowing the electrolyte to move in one direction and blocking the movement in the opposite direction, and for example, a valve, a shut-off valve, a check valve, or a floating valve may be employed. .

According to the present embodiment, a check valve is used as the backflow prevention device 30, and of course, it is not limited thereto. Check valve is any type of check that can control the flow direction of fluid, such as a ball type check valve, valve type check valve, lift type check valve, swing check valve, swing wafer check valve, or split disk check valve. Valves can also be used.

Referring to FIG. 2, the backflow prevention port 30 is provided on the filling passage 26 and the return passage 25 to prevent reverse flow of the electrolyte.

The check valve installed in the filling passage 26 allows the electrolyte to flow into the supply tank 21 from the recovery tank 24, and the electrolyte flows back to the recovery tank 24 from the supply tank 21 side. To prevent.

The check valve installed in the return flow channel 25 allows the electrolyte to flow into the recovery tank 24 from the battery cell 10, and the electrolyte flows back to the battery cell 10 from the recovery tank 24 side. To prevent.

In FIG. 2, the backflow prevention hole 30 is provided in the filling passage 26 and the return passage 25, but when the flow resistance inside the battery cell 10 is greater than the flow resistance inside the filling passage 26, the above It is also possible to remove the backflow prevention port 30 installed on the return flow path 25. That is, when pressure is transmitted to the electrolyte by the second pressure transfer unit 27, the electrolyte does not flow from the recovery tank 24 to the battery cell 10 having a high flow resistance, and a supply tank having a small flow resistance. As it flows to (21), the desired flow of electrolyte is achieved.

Hereinafter, the action or effect of the redox flow battery according to the above configuration will be described in detail.

2 shows the operation when the electrolyte is introduced into the battery cell 10. As shown in FIG. 2, when the first pressure transfer unit 23 applies pressure to the electrolyte stored in the supply tank 21, the electrolyte flows into the battery cell 10 through the supply passage 22. At this time, the electrolyte solution does not flow toward the recovery tank 24 by the backflow prevention port 30 provided in the filling passage 20, but flows into the battery cell 10 through the supply passage 22.

Ion exchange occurs inside the battery cell 10 by the electrolyte introduced into the battery cell 10, and the electrolyte solution 10 is transferred from the battery cell 10 to the recovery tank 24 through the return flow path 25. Flow in. At this time, the backflow prevention port 30 provided in the return flow channel 25 allows the flow of electrolyte from the battery cell 10 to the recovery tank 24, and conversely, from the recovery tank 24 to the battery cell 10. Since it is prevented from flowing backward, the electrolyte solution flows in one direction.

3 shows an operation when the electrolyte solution moves from the recovery tank 24 to the supply tank 21. As shown in Fig. 3, when the second pressure transfer unit 27 applies pressure to the electrolyte stored in the recovery tank 24, the electrolyte flows into the supply tank 21 through the filling passage 26, Fill the supply tank (21) again. At this time, the backflow prevention port 30 provided in the filling passage 26 allows the electrolyte to flow from the recovery tank 24 toward the supply tank 21. In addition, according to the present embodiment, since the backflow prevention hole 30 provided in the return flow channel 25 prevents the electrolyte from flowing into the battery cell 10, the electrolyte is supplied from the recovery tank 24 It flows to the tank 21. By this action, the electrolyte circulates in one direction from the supply tank 21 and enters the supply tank 21 again.

As described above, the redox flow battery according to an embodiment of the present invention improves the overall efficiency of the redox flow battery by reducing the flow path resistance in the process of circulating the electrolyte. That is, in the present invention, since the electrolytic solution does not flow into the pumping means for circulating the electrolytic solution as in the prior art, the flow path resistance can be significantly reduced.

In addition, the redox flow battery according to an embodiment of the present invention can easily control the flow of the electrolyte by appropriately controlling the pressure applied by the first and second pressure transfer units 23 and 27 to the electrolyte.

In addition, since the redox flow battery according to the exemplary embodiment of the present invention can simplify the overall configuration, the reliability of the redox flow battery is improved and the convenience of manufacture is improved.

On the other hand, the redox flow battery according to the embodiment of the present invention may be implemented in another type of embodiment as shown in FIGS. 5 to 7. In Figs. 5 to 7, the same reference numerals are assigned to configurations that have the same functions or functions as those in the embodiment of Fig. 1, and detailed descriptions thereof are omitted.

According to another embodiment of the present invention, two or more electrolyte supply units 20 may be provided. When the electrolyte is supplied to the battery cell 10 through at least one of the electrolyte supply units 20, the remaining electrolyte supply unit 20 transfers the electrolyte solution from the recovery tank 24 to the supply tank 21 ) To fill.

Referring to FIG. 5, in the redox flow battery according to the present embodiment, two electrolyte supply units 20 are provided. 5, an electrolyte supply unit 20 is provided on the upper and lower sides, respectively. Each supply tank 21 of the electrolyte supply unit 20 is connected to the battery cell 10 by a separate supply channel 22. In addition, each recovery tank 24 of the electrolyte supply unit 20 is connected to the battery cell 10 by a separate return flow channel 25.

In the electrolyte supply unit 20 provided on the upper side, the supply tank 21 and the recovery tank 24 on the upper side are connected by a filling passage 26. The electrolyte supply unit 20 provided at the lower side is also connected to the supply tank 21 and the recovery tank at the lower side by a filling passage 26. In the present embodiment, the supply passage 22, the return passage 25, and the filling passage 26 are provided with backflow prevention ports 30, respectively.

While the first pressure transfer unit 23 applies pressure to the electrolyte supply unit 20 provided on the upper side and the electrolyte solution from the supply tank 21 flows into the battery cell 10, the electrolyte supply unit 20 provided at the lower side has a second The electrolytic solution stored in the recovery tank 24 is introduced into the supply tank 21 provided at the lower side by the pressure transmission unit 27. That is, in the electrolyte supply unit 20 provided on the upper side, a supply step of introducing the electrolyte into the battery cell 10 is performed, and in the electrolyte solution supply unit 20 provided at the lower side, a recovery step of recovering the electrolyte solution to the recovery tank 24 is performed. do.

When this process is over, a supply step in which the electrolyte is supplied to the battery cell by the electrolyte supply unit 20 provided at the lower side is performed, and the recovery step in which the electrolyte solution is recovered to the recovery tank 24 is performed at the electrolyte solution supply unit 20 provided at the upper side. Performed.

Accordingly, the electrolyte solution supply unit 20 provided on the upper side and the electrolyte solution supply unit 20 provided on the lower side operate opposite to each other and continuously and uniformly supply the electrolyte solution to the battery cell 10. That is, according to the present embodiment, while the supply tank 21 is filled by flowing the electrolyte from the recovery tank 24 to the supply tank 21, the electrolyte is temporarily transferred from the supply tank 21 to the battery cell 10. Since it is not supplied, it is possible to prevent the battery charging and discharging efficiency from deteriorating.

6 shows another embodiment of the present invention. The embodiment of Fig. 6 is different from the embodiment of Fig. 5 in that the common passage 40 is provided.

Specifically, when a plurality of the electrolyte supply units 20 are provided, each supply passage 22 extending from each supply tank 21 is merged before flowing into the battery cell 10 to form a common passage 40 do. As shown in Fig. 6, two electrolyte supply units are provided, a supply channel 22 is connected from each supply tank 21 constituting the electrolyte supply unit, and each supply channel 22 is the battery cell. Are merged with each other before connecting to (10).

When the common flow path 40 is used as described above, since the number of flow paths connected to the battery cell 10 is reduced, the configuration or design of the redox flow battery can be simplified.

Fig. 7 shows another embodiment of the present invention.

Referring to FIG. 7, the supply tank 21 or the recovery tank 24 may be implemented to be expandable and contracted so that the internal volume thereof is variable. At this time, the first pressure transfer unit 23 extends and contracts the supply tank 21 to transfer pressure to the electrolyte, and the second pressure transfer unit 27 expands and contracts the recovery tank 24 to provide the electrolyte solution. Transfers pressure to

According to the present embodiment, the supply tank 21 includes a first variable part 211 and a first extension part 212. The first variable part 211 is a part whose internal volume is variable, and the first extension part 212 is a part that extends from the first variable part 211 and does not change the internal volume. One end of the filling passage 26 is coupled to the first extension part 212.

Like the supply tank 21, the recovery tank 24 includes a second variable part 241 and a second extension part 242. The second variable part 241 is a part whose internal volume is variable, and the second extension part 242 is a part that extends from the second variable part 241 and has no internal volume change. The other end of the filling passage 26 is coupled to the second extension part 242. The filling passage 26 is coupled to the first and second extension parts 212 and 242 that do not change in volume and is structurally stable.

The process of circulating the electrolytic solution received pressure by the first and second pressure transfer units 23 and 27 is the same as that of the embodiment shown in FIG. 1, and thus a detailed description thereof is omitted.

In this embodiment, the supply tank 21 or the recovery tank 24 may be of any type in which the volume changes so that pressure can be transmitted to the electrolyte. For example, it may be implemented in the form of bellows, a rubber bag, or a vinyl pack.

According to this embodiment, since the first and second pressure transfer units 23 and 27 may be implemented in a form of indirectly transmitting pressure to the electrolyte, the supply tank 21 and the recovery tank 24 The stored electrolyte is isolated from external components to prevent contamination of the electrolyte from foreign substances.

Meanwhile, the redox flow battery according to the present invention further includes a fluid filter 50, an oxygen absorption device 60, an oxygen supply device 70, and a pressure reduction device 80, as shown in FIG. 4 can do.

The fluid filter 50 is provided to remove foreign substances contained in the electrolyte. The foreign matter refers not only to solid/liquid substances such as dust, reaction by-products, or electrolyte residue, but also gaseous impurities that may affect the performance of the electrolyte. The fluid filter 50 is installed on a flow passage through which the electrolyte flows, that is, on the supply passage 22, the return passage 25, the filling passage 26, or in the supply tank 21 or the recovery tank 24 to provide an electrolyte solution. This mixed impurity can be removed. For example, the fluid filter 50 may be implemented with various filters in consideration of the properties of the object to be removed.

The oxygen absorption device 60 or the oxygen supply device 70 is provided to control the oxidation number of the electrolyte. The oxygen absorption device 60 is provided to absorb oxygen to reduce the number of oxidations contained in the electrolyte, and the oxygen supply device 70 is provided to supply oxygen to increase the number of oxidations contained in the electrolyte. do. According to this embodiment, the oxygen absorption device 60 or the oxygen supply device 70 is provided in the supply tank 21 or the recovery tank 24. Of course, the oxygen absorbing device 60 and the oxygen supply device 70 may be provided on a flow path through which an electrolyte solution flows, if necessary.

The pressure reducing device 80 is provided to reduce the pressure when the pressure inside the battery cell 10 or the electrolyte supply unit 20 is higher than a predetermined pressure. In this embodiment, the pressure reducing device 80 may employ a relief valve that discharges pressure by operating above a specific pressure. Of course, the pressure sensitive device 80 is not limited to a relief valve. In addition, since the pressure reducing device 80 may be provided as many as necessary on the supply tank 21, the recovery tank 24, the battery cell 10, or the flow path through which the electrolyte flows, the installation location and number are particularly limited. It does not become.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above embodiments, and various modifications may be provided without departing from the scope of the present invention.

10... battery cell 11... positive electrode
12... cathode 13... separator
14... Separator 20... Electrolyte supply part
21... Supply tank 211... 1st variable part
212... 1st extension 22... Supply channel
23... 1st pressure transmission part 24... Recovery tank
241... the second variable part 242... the second extension part
25... return flow 26... fill flow
27... 2nd pressure transmission part 30... Backflow prevention port
40... Common flow path 50... Fluid filter
60... Oxygen Absorption System 70... Sanpo Supply
80... Pressure reducing device 100.. Redox flow battery

Claims (13)

Including a separator 13 and a battery cell 10 provided with a positive electrode 11 and a negative electrode 12 on both sides of the separator 13; and an electrolyte solution supply unit 20 for supplying an electrolyte to the battery cell 10. In the redox flow battery,
The electrolyte solution supply unit 20,
A supply tank 21 for storing the electrolyte supplied to the battery cell 10;
A supply passage 22 connecting the supply tank 21 and the battery cell 10;
A first pressure transfer unit 23 for applying pressure to the electrolyte stored in the supply tank 21 to flow the electrolyte into the battery cell 10 through the supply passage 22;
A recovery tank 24 in which the electrolyte solution discharged after circulating inside the battery cell 10 is recovered;
A return air passage (25) connecting the battery cell (10) and the recovery tank (24);
A filling passage 26 connecting the recovery tank 24 and the supply tank 21; And
And a second pressure transfer unit 27 for applying pressure to the electrolyte stored in the recovery tank 24 to flow the electrolyte into the supply tank 21 through the filling passage 26. Redox flow battery. The method of claim 1,
The redox flow battery, characterized in that the filling passage (26) is provided with a reverse flow prevention port (30) for preventing the reverse flow of the electrolyte. The method of claim 2,
A redox flow battery, characterized in that the return flow path (25) is provided with a reverse flow prevention port to prevent reverse flow of the electrolyte. The method of claim 1,
Two or more of the electrolyte supply units 20 are provided,
When the electrolyte is supplied to the battery cell 10 through at least one of the electrolyte supply units 20, the remaining electrolyte supply unit 20 transfers the electrolyte solution from the recovery tank 24 to the supply tank 21 Redox flow battery, characterized in that filled with ). The method of claim 4,
Each supply tank (21) of the electrolyte supply unit (20) is connected to the battery cell by a separate supply channel (22). The method of claim 5,
Each of the supply passages 22 extending from the respective supply tanks 21 are merged before flowing into the battery cell 10 to form a common passage 40. The method of claim 1,
The supply tank 21 or the recovery tank 24 may include rubber, fluorocarbon rubber, polyolefin resin, olefin polyethylene (PE), chlorinated polyethylene, polypropylene, alkanes solid wax, or polyvinyl chloride. Redox flow battery, characterized in that made of a material selected from among resins. The method of claim 1,
The redox flow battery, characterized in that a plurality of the first pressure transmission unit (23) or the second pressure transmission unit (27) are provided. The method of claim 1,
Redox flow battery, characterized in that it comprises a fluid filter (50) for removing foreign substances contained in the electrolyte. The method of claim 1,
The supply tank 21 or the recovery tank 24 comprises an oxygen absorption device 60 for absorbing oxygen or an oxygen supply device 70 for supplying oxygen to control the oxidation number of the electrolyte. Redox flow battery. The method of claim 1,
When the internal pressure of the battery cell 10 or the electrolyte supply unit 20 is greater than or equal to a predetermined pressure, a pressure reducing device 80 for reducing the pressure is provided. The method of claim 1,
The supply tank 21 or the recovery tank 24 is expandable and contractable so that the internal volume is variable, and the first pressure transmission unit 23 or the second pressure transmission unit 27 may be the supply tank 21 or A redox flow battery, characterized in that the pressure is transmitted to the electrolyte by expanding and contracting the recovery tank (24). The method of claim 12,
The supply tank 21 includes a first variable portion 211 having a variable internal volume, and a first extension portion extending from the first variable portion 211 and having no internal volume change and to which the filling passage 26 is coupled. Including (212),
The recovery tank 24 includes a second variable portion 241 having a variable internal volume, and a second extension portion extending from the second variable portion 241 and having no internal volume change, and to which the filling passage 26 is coupled. Redox flow battery, characterized in that it comprises (242).

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