WO2020075899A1

WO2020075899A1 - Redox flow battery

Info

Publication number: WO2020075899A1
Application number: PCT/KR2018/012868
Authority: WO
Inventors: 김부기; 이동영; 김기현; 최담담; 박상현; 최강영
Original assignee: 스탠다드에너지 주식회사
Priority date: 2018-10-11
Filing date: 2018-10-26
Publication date: 2020-04-16
Also published as: KR20200041121A

Abstract

The present invention relates to a redox flow battery, comprising a battery module provided with: a battery cell comprising a positive electrode and a negative electrode therein; an electrolyte tank comprising a cathode electrolyte storage unit and an anode electrolyte storage unit; an electrolyte flow path connecting the electrolyte tank and the battery cell to transfer an electrolyte; and a fluid control unit for transmitting, to the electrolyte flow path, pressure generated from the outside, wherein one or more of the battery module is provided, the battery modules are charged and discharged by circulation of electrolyte in each battery module independently, or are charged and discharged by circulation of electrolyte in a plurality of the battery modules, and the battery modules each further comprises an electrolyte connection unit for connecting the cathode electrolyte storage unit and the anode electrolyte storage unit.

Description

Redox flow battery

The present invention relates to a redox flow battery, and more specifically, to reduce the reaction time by providing an electrolyte tank for storing the positive electrode electrolyte and the negative electrode electrolyte for each battery cell and a fluid control unit for transferring the electrolyte to the battery cell, reducing the classification time shunt current), and relates to a redox flow battery capable of maintaining the balance of the electrolyte stored in the anode electrolyte storage and the cathode electrolyte storage through an electrolyte connection.

Recently, renewable energy such as solar energy or wind energy has been spotlighted as a method for suppressing greenhouse gas emission, which is a major cause of global warming, and many studies have been conducted to spread their commercialization. However, renewable energy is greatly affected by the location environment and natural conditions. Moreover, renewable energy has a disadvantage in that it cannot supply energy evenly and continuously because the output fluctuation is severe. Therefore, in order to use renewable energy for home or commercial use, a system capable of storing energy when the output is high and using stored energy when the output is low is used.

A large-capacity secondary battery is used as the energy storage system. For example, a large-capacity secondary battery storage system is introduced in a large-scale photovoltaic power generation and wind power generation complex. Examples of the secondary battery for storing large-capacity power include a lead acid battery, a sodium sulfide (NaS) battery, and a redox flow battery (RFB).

The lead acid battery is widely used commercially compared to other batteries, but has disadvantages such as low efficiency and maintenance costs due to periodic replacement and treatment of industrial waste generated when replacing the battery. In the case of a NaS battery, it has an advantage of high energy efficiency, but has a disadvantage of operating at a high temperature over 300 ° C. Redox flow batteries are capable of operating at room temperature and have the ability to independently design capacity and output, so many studies have been conducted with near-capacity secondary batteries.

Redox flow battery is a secondary battery (Secondary) capable of charging and discharging electric energy by forming a stack in which a separator (membrane), an electrode and a bipolar plate are arranged in series, similar to a fuel cell. battery). The redox flow battery undergoes ion exchange while circulating the anode electrolyte and the cathode electrolyte supplied from the anode and cathode electrolyte storage tanks on both sides of the separator, and in this process, electrons are generated and charged and discharged. Such a redox flow battery is known to be most suitable for an ESS (Energy storage system) because it has a longer life span than a conventional secondary battery and can be manufactured in a medium to large-sized system of kW to MW.

However, in the redox flow battery, the tank for storing the anode electrolyte and the cathode electrolyte is separate.

A structure that is arranged with a certain space on the road (for example, a certain ball on both sides or under the stack)

A structure in which an electrolyte tank is disposed with a space between the stacks and the electrolyte circulation pipe connecting the stack and the electrolyte tank, and in the overall system volume, a lead-acid battery or a lithium-ion battery which is another power storage device based on a similar power storage capacity. And lithium-sulfur batteries

W has a relatively big drawback.

In addition, since a plurality of electrolyte circulation pipes connected to the stack, the pump, and the electrolyte tank must be provided, a pump capacity of a certain standard or higher is required to supply the electrolyte to each stack constantly. As the length of the electrolyte circulation pipe increases, There is a problem that the size of the pump and the manufacturing cost of the battery are increased due to the increase in the required capacity, and the overall battery efficiency is lowered as the power consumption increases as the pump capacity increases.

In addition, the general battery should have a fast operation responsiveness in which charging and discharging operations are performed. However, in the case of the redox flow battery, when it is operated for charging and discharging in a stopped state, it takes time for the electrolyte to circulate inside the stack by the pump, and the responsiveness of the time required decreases. There is a problem in that the cost increases because a large number of chemical-resistant pipes are connected to the pump.

Here, a typical redox flow battery is supplied with electrolyte to each battery cell through a manifold. However, the electrolyte filled in the manifold serves as an electric passage connecting each cell.

Therefore, it can become the electron's moving path, and through this path, shunt current occurs, and part of the energy is lost by the shunt current during charging and discharging, which is the main cause of reduced efficiency, component damage, and cell performance irregularity. Cause. In the past, in order to reduce the shunt current, a method of increasing the length of the manifold and narrowing the cross-sectional area was mainly adopted, but this increases the flow resistance of the fluid, resulting in pumping loss, and an alternative to overcome this is required.

In addition, in general, when the redox flow battery is driven, ion exchange is performed through a separation membrane, and materials contained in the electrolyte are moved from the positive electrode to the negative electrode or from the negative electrode to the positive electrode. As described above, when the material contained in the electrolyte is moved from the anode to the cathode or the cathode to the anode, when the amount of the anode electrolyte and the cathode electrolyte is in the initial state, the 1: 1 ratio is changed to 0.8: 1.2.

In addition, when supplying the electrolyte to the positive electrode and the negative electrode, when the supply time, supply timing, and supply pressure of the positive electrode and the negative electrode are not the same, the difference between the positive electrode and the negative electrode (amount or water level in the electrolyte tank) may be greater.

That is, the balance of the positive electrode electrolyte and the negative electrode electrolyte is changed differently from the initial state by driving the redox flow battery, which decreases the driveable capacity of the redox flow battery and causes the battery to deteriorate. There is a problem.

The present invention is to solve the above-mentioned problems, and more specifically, to reduce the reaction time by providing an electrolyte tank for storing the positive electrode electrolyte and the negative electrode electrolyte for each battery cell and a fluid control unit for transferring the electrolyte to the battery cell, reducing the classification time. The present invention relates to a redox flow battery capable of suppressing the generation of (shunt current) and maintaining the balance of the electrolyte stored in the anode electrolyte storage and the cathode electrolyte storage through an electrolyte connection.

The redox flow battery of the present invention for solving the above-mentioned problems, a battery cell including an anode electrode and a cathode electrode therein; and an electrolyte tank including an anode electrolyte storage unit and a cathode electrolyte storage unit; and the electrolyte tank and the It includes a battery module comprising an electrolyte flow path through which the electrolyte is transferred by connecting the battery cells; and a fluid control unit for transmitting the pressure generated from the outside to the electrolyte flow path, wherein the battery module is provided with one or two or more, the The battery module is characterized in that it further comprises an electrolytic solution connecting portion for circulating and charging and discharging the electrolyte independently or circulating and charging and discharging the electrolyte in the plurality of battery modules, and connecting the positive electrode electrolyte storage portion and the negative electrode electrolyte storage portion. Is to do.

The redox flow battery of the present invention for solving the above-described problem is connected to the fluid control unit, and is provided between a pressure generator capable of transferring pressure to the fluid control unit by forming pressure, and between the pressure generator and the fluid control unit And, it may further include a pressure control valve capable of selectively transmitting a positive pressure or a negative pressure to the fluid control unit.

The electrolyte connection portion of the redox flow battery of the present invention for solving the above-described problem may be filled with a liquid or slurry containing at least one selected from the group consisting of water, an aqueous acid solution, and an active material, and the electrolyte connection portion , It can be filled with a porous material.

The electrolyte connection portion of the redox flow battery of the present invention for solving the above-described problem may be formed of a hollow pipe, and the electrolyte connection portion may include a storage portion having a larger cross-sectional area than the hollow pipe.

The diameter of the redox flow battery of the present invention for solving the above-described problem or the diameter when the cross-sectional area of the electrolyte connection portion is converted into a circle of the same area may be less than 1/3 of the length of the electrolyte connection portion. have.

The volume of the electrolyte connection part of the redox flow battery of the present invention for solving the above-mentioned problem is 1 to 50% of the sum of the electrolyte solution stored in the positive electrode electrolyte storage part and the electrolyte solution stored in the negative electrode electrolyte storage part. You can.

The volume of the electrolyte connection portion of the redox flow battery of the present invention for solving the above-described problem, when charging the battery module discharged while the electrolyte connection portion is closed, the electrolyte moves from the positive electrode to the negative electrode or from the negative electrode to the positive electrode. It may be 2% or more of the volume.

The electrolyte connection part of the redox flow battery of the present invention for solving the above-described problem may further include a connection part valve capable of closing or opening the electrolyte connection part, wherein the connection part valve is configured to charge or discharge the battery module. At this time, a portion of the electrolyte connection portion may be closed or the entire electrolyte connection portion may be closed.

The redox flow battery of the present invention for solving the above-described problem further includes a connection part pressure generator connected to the connection part valve and capable of transmitting pressure to the connection part valve by forming pressure, wherein the connection part valve comprises: A switch operated by a connection pressure generator may be included.

The connection valve of the redox flow battery of the present invention for solving the above-described problem may include a switch operated by electricity.

Both ends of the electrolyte connection portion of the redox flow battery of the present invention for solving the above-described problems are connected to the positive electrode electrolyte storage portion and the negative electrode electrolyte storage portion, and the end of the electrolyte connection portion is the positive electrode electrolyte storage portion or the In a position connected to the negative electrode electrolyte storage unit, a straight line distance from the battery cell to the inlet of the electrolyte into the positive electrode electrolyte storage unit or the negative electrode electrolyte storage unit, an end of the electrolyte connection unit is the positive electrode electrolyte storage unit or the negative electrode electrolyte storage In a position connected to the negative electrode, the positive electrode electrolyte storage unit or the negative electrode electrolyte storage unit may be at least twice the straight line distance from the electrolyte to the outlet.

The present invention has an advantage in that the transport path can be effectively reduced and the efficiency of the battery can be increased as each battery cell is provided with an electrolyte tank for storing the anode electrolyte and the cathode electrolyte. In addition, the present invention has an advantage of effectively reducing the shunt current that may occur in each battery module by providing a fluid control unit using pressure instead of having a pump.

Along with this, the present invention can maintain the electrolyte balance between the positive electrode electrolyte storage portion and the negative electrode electrolyte storage portion through the electrolyte connection portion connecting the positive electrode electrolyte storage portion and the negative electrode electrolyte storage portion, thereby preventing the performance of the battery from being reduced. There are advantages.

1 is a view showing a redox flow battery in which a plurality of battery modules are combined according to an embodiment of the present invention.

2 is a view showing the internal structure of a battery module according to an embodiment of the present invention.

3 is a view showing a redox flow battery having a plurality of pressure generators and a plurality of fluid control units according to an embodiment of the present invention.

4 is a view showing a redox flow battery in which a plurality of battery modules are combined according to an embodiment of the present invention.

5 is a view showing that the storage portion is provided in the electrolyte connection according to an embodiment of the present invention.

6 is a view showing that the valve is provided in the electrolyte connection according to an embodiment of the present invention.

7 illustrates an internal structure of a battery module according to another embodiment of the present invention, and is a view when the battery module is viewed from the side.

8 illustrates an internal structure of a battery module according to another embodiment of the present invention, and is a view when the battery module is viewed from the top.

9 is a view showing the internal structure of the battery module according to another embodiment of the present invention, a view showing that the electrolyte connection is provided.

10 is a view showing the internal structure of the battery module according to another embodiment of the present invention, a view showing that the storage portion is provided in the electrolyte connection.

11 is a view showing the internal structure of a battery module according to another embodiment of the present invention, a view showing that the valve is provided in the electrolyte connection.

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

Expressions such as “comprises” or “can 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 invented, and additional one or more functions, operations, or The components and the like are not limited. Further, in various embodiments of the present invention, terms such as “include” or “have” are intended to indicate that there are features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, It should be understood that one or more other features or numbers, steps, actions, components, parts, or combinations thereof are not excluded in advance.

When it is stated that an element is "connected" to another element, the other element may be directly connected to the other element, but another new element between the other element and the other element It should be understood that may exist. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it will be understood that no new component exists between the component and the other components. You should be able to.

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

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

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

In the present invention, the term 'battery cell (battery cell)' is the smallest unit in which charge and discharge occur through the electrolyte, and is composed of a separator, a separator, and the like in which ion exchange occurs. In the present invention, the term 'stack' means that a plurality of battery cells are stacked or configured.

The present invention relates to a redox flow battery, the electrolyte tank for storing the positive electrode electrolyte and the negative electrode electrolyte for each battery cell and a fluid control unit for transferring the electrolyte to the battery cell to reduce reaction time and reduce the shunt current. The present invention relates to a redox flow battery that can suppress generation and maintain a balance of an electrolyte stored in a cathode electrolyte storage and a cathode electrolyte storage through an electrolyte connection. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, the redox flow battery according to an embodiment of the present invention includes a battery module 100 including a battery cell 100, an electrolyte tank 200, a fluid control unit 300, and an electrolyte flow path 400. It includes, it is characterized in that it further comprises an electrolyte connection portion (600).

The battery cell 100 of the battery module 10 may include an anode electrode 110 and a cathode electrode 120 therein. The battery cell 100 is a place where an electrochemical reaction may occur while moving, charging, and discharging the electrolyte supplied from the electrolyte tank 200, and the battery cell 100 includes a separator 130 and a separator ( 140) may be further included.

Specifically, referring to FIG. 2, the battery cell 100 includes the separator 130 provided between the anode electrode 110 and the cathode electrode 120, the anode electrode 110, and the cathode electrode ( 120) may be provided on the outer surface of the separation plate 140. The anode electrode 110, the cathode electrode 120, the separator 130, and the separator 140 may be located in the housing 150, and the electrolyte is moved and charged in the housing 150. , Electrochemical reactions such as discharge occur. One of the battery cells 100 may be included in the electric module 10, and two or more of the battery cells 100 may be included. In addition, depending on the driving environment of the battery cell 100, any one or more components of the anode electrode 110, the cathode electrode 120, the separator 130, and the separator 140 may be omitted.

The electrolyte tank 200 includes an anode electrolyte storage unit 210 and a cathode electrolyte storage unit 220. The electrolyte tank 200 is capable of storing the electrolyte solution, and the electrolyte solution stored in the electrolyte tank 200 is supplied to the battery cell 100 through the electrolyte passage.

Specifically, the electrolyte solution stored in the positive electrode electrolyte storage unit 210 is supplied to the positive electrode 110 of the battery cell 100, and the electrolyte solution stored in the negative electrode electrolyte storage unit 220 is the battery It is supplied to the cathode electrode 120 of the cell 100.

The electrolyte supplied from the electrolyte tank 200 to the battery cell 100 through the electrolyte flow path, after reacting inside the battery cell 100, enters the electrolyte tank 200 again through the electrolyte flow path and circulates. Is done.

The electrolyte flow path 400 connects the battery cell 100 and the electrolyte tank 200, and the electrolyte moves from the battery cell 100 to the electrolyte tank 200 through the electrolyte flow path 400. Or, the electrolyte moves from the electrolyte tank 200 to the battery cell 100.

A plurality of electrolyte passages 400 may be provided, from the battery cell 100 to the electrolyte passage to move the electrolyte from the electrolyte tank 200 to the battery cell 100 from the electrolyte tank 200 The electrolyte flow paths for moving the electrolyte may be formed separately from each other. Alternatively, when the electrolyte flow path 400 is provided with only one of each of the positive electrode and the negative electrode, the direction in which the electrolyte flows through one electrolyte flow path changes in the forward direction and the reverse direction, so that the electrolyte may circulate.

The fluid control unit 300 according to an embodiment of the present invention replaces an existing pump and is used to circulate the electrolyte, and the fluid control unit 300 transmits pressure generated externally to the electrolyte flow path 400 It is possible. The fluid control unit 300 may be provided in the electrolyte flow path 400, but is not limited thereto, and may be provided in various locations as long as pressure can be transmitted to the electrolyte flow path 400. For example, the fluid control unit 300 may be provided in the electrolyte tank 200.

The fluid control unit 300 is provided to allow the electrolyte to flow in a predetermined direction using a change in pressure, and various structures may be applied as long as it prevents backflow and transfers the electrolyte through a change in pressure. For example, the fluid control unit 300 may be formed of a check valve, and the fluid control unit 300 may selectively receive positive pressure or negative pressure from the outside.

The fluid control unit 300 included in the battery module 10 may be provided with one or two or more. Specifically, the fluid control unit 300 may be provided separately from the fluid control unit to which the positive pressure is supplied and the fluid control unit to which the negative pressure is supplied, thereby forming a continuous flow of electrolyte.

Redox flow battery according to an embodiment of the present invention may further include a pressure generator 500, a pressure control valve 510, a fluid transfer pipe 310. Referring to FIG. 3, the pressure generator 500 is connected to the fluid control unit 300 and is capable of transmitting pressure to the fluid control unit 300 by forming pressure. The pressure generator 500 may transmit positive pressure or negative pressure to the fluid control unit 300 while forming positive or negative pressure.

If the pressure generator 500 is capable of transmitting pressure to the fluid control unit 300 by forming pressure, various devices may be used. According to an embodiment of the present invention, the pressure generator 500 may be a compressor or a pump for the formation of positive pressure, and the pressure generator 500 is provided with vacuum equipment, suction equipment or a venturi tube for formation of negative pressure. It can be an ejector. Alternatively, positive and negative pressures generated by the pressure generator 500 may be used at the same time.

In addition, a plurality of pressure generators 500 may be provided. Specifically, the pressure generator 500 may be formed of a plurality of devices while the device for forming the positive pressure and the device for forming the negative pressure are separated.

The fluid transfer pipe 310 connects the fluid control unit 300 and the pressure generator 500 to transmit the pressure generated by the pressure generator 500 to the fluid control unit 300. The fluid transfer pipe 310 may be filled with fluid, and the pressure formed by the pressure generator 500 may be transmitted to the fluid control unit 300 through the fluid of the fluid transfer pipe 310. The fluid filled in the fluid transfer pipe 310 may be both gas and liquid, and may be freely selected according to the type of pressure to be operated.

The pressure control valve 510 is provided between the pressure generator 500 and the fluid control unit 300, and can selectively deliver positive pressure or negative pressure to the fluid control unit 300. The pressure control valve 510 is for alternately supplying positive pressure and negative pressure to the fluid control unit 300, and may be formed in a structure that can freely control the opening and closing of the port according to the pressure supply cycle.

The pressure control valve 510 may be provided with a plurality of pipes and switches. By controlling the number and switching type of the plurality of pipes, the pressure control valve 510 can be supplied while alternately supplying positive and negative pressure to the fluid control unit 300. Specifically, the pressure control valve 510 is simultaneously connected to the pressure generator 500 to which the positive pressure and the negative pressure are supplied, and can select and supply the positive pressure and the negative pressure through the switch to the fluid control unit 300.

However, the pressure control valve 510 is not limited thereto, and various devices may be used if the positive and negative pressures can be selectively supplied to the fluid control unit 300. In addition, when supplying the positive pressure and the negative pressure to the fluid control unit 300 through the pressure control valve 510, a separate controller is provided to change the cycle of supplying the positive pressure and the negative pressure, or to change the number of switches and a plurality of pipes. By adjusting, the pressure may be supplied to the fluid control unit 300 while changing a cycle in which positive pressure and negative pressure are supplied.

The battery module 10 of the redox flow battery according to an embodiment of the present invention is provided with one or two or more, the battery module 10 is independently charged and discharged by circulating the electrolyte, or the plurality of the battery module ( It is possible to charge and discharge by circulating the electrolyte in 10).

That is, the battery module 10 may be charged and discharged by independently circulating the electrolyte in one battery module 10 without interference or exchange between the battery modules 10, and the plurality of battery modules 10 It is also possible to charge and discharge while circulating the electrolyte solution by being connected to a certain number.

Referring to FIG. 4, when a plurality of the battery modules 10 are connected, the battery modules 10 may be electrically connected in series or in parallel through a module connection unit 11, and the plurality of battery modules 10 When connected, the electrolyte tank 200 may be shared. As described above, when the battery module 10 is independently charged and discharged, or when a plurality of the battery modules 10 are connected, the required performance can be adjusted by sharing the electrolyte tank 200.

In addition, when a plurality of the battery modules 10 are connected, they may be connected in series or in parallel through a module connection unit 11, and when a plurality of the battery modules 10 are connected, the pressure generator 500 may be shared.

The redox flow battery according to an embodiment of the present invention further includes an electrolyte connection portion 600 connecting the positive electrode electrolyte storage portion 210 and the negative electrode electrolyte storage portion 220. 1 to 3, the electrolyte connection part 600 is provided to maintain the balance of the electrolyte between the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220, the electrolyte connection unit ( 600) may be filled with an electrolyte or a material capable of ion exchange. Here, the balance of the electrolytic solution means a physical (water level, volume, specific gravity or mass, etc.) or chemical (concentration or oxidation water, etc.) balance.

Specifically, the electrolyte connection portion 600 may be made of a hollow pipe, and the electrolyte connection portion 600 may be filled with a liquid or slurry containing at least one selected from the group consisting of water, an aqueous acid solution, and an active material. will be.

When the redox flow battery according to the embodiment of the present invention is driven, ion exchange is performed through the separation membrane 130 (ion exchange membrane), and the active material, water, acid, and the like included in the electrolyte are the positive electrode ( In 110, the cathode electrode 120 or the cathode electrode 120 may be moved to the anode electrode 110.

When the active material, water, acid, etc. contained in the electrolyte solution moves from the positive electrode 110 to the negative electrode 120 or from the negative electrode 120 to the positive electrode 110, finally The active material, water, acid, etc. included in the electrolyte solution are the cathode electrolyte storage unit 220 in the cathode electrolyte storage unit 210 or the cathode electrolyte storage unit 210 in the cathode electrolyte storage unit 220 Will move to

Therefore, when the amount of the positive electrode electrolyte and the negative electrode electrolyte stored in the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220 is in an initial state, for example, a ratio of 1: 1 is practiced. During the operation of the redox flow battery according to an example, the ratio of the amount of the positive electrode electrolyte and the negative electrode electrolyte stored in the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220 changes as 0.8: 1.2.

That is, the balance of the stored electrolyte of the anode electrolyte storage unit 210 and the cathode electrolyte storage unit 220 does not match, and the water level of the anode electrolyte storage unit 210 and the cathode electrolyte storage unit 220 (level) can be changed from the initial state. When such a phenomenon occurs and repetitive charging and discharging of the redox flow battery progresses, there is a problem in that the drive capacity of the redox flow battery is reduced. (In this case, the amount of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220 is not limited to 1: 1, but the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit The initial state of the amount of 220 may not be 1: 1 The amount of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220 is 1: 1 when the initial state is one of the present invention. It is only an embodiment of the.)

In particular, each of the battery modules 10, such as a redox flow battery according to an embodiment of the present invention includes an electrolyte, and when the electrolyte movement between the battery modules 10 is limited and operates independently, the battery There is a problem in that the performance of the redox flow battery decreases due to a difference in performance and capacity balance between the modules 10. In addition, a redox flow battery having a fluid control unit 300 according to an embodiment of the present invention operates the fluid control unit 300 that may occur between the positive electrode and the negative electrode or between the battery module 10 and the battery module 10. Differences in the balance of the electrolyte may occur due to variations.

The electrolyte connection unit 600 is to connect the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220 to prevent this, and the electrolyte connection unit 600 is an electrolyte or a material capable of exchanging ions and substances, etc. As this is filled, it is possible to mix with the electrolyte of the anode electrolyte storage unit 210 and the electrolyte of the cathode electrolyte storage unit 220.

More specifically, when the water level of the negative electrode electrolyte storage unit 220 is increased by a material moved from the positive electrode electrode 110 to the negative electrode electrode 120, the negative electrode electrolyte solution is stored through the electrolyte connection unit 600. A part of the electrolyte solution stored in the unit 220 may be mixed while moving to the anode electrolyte storage unit 210.

The electrolyte connection portion 600 is preferably made of a hollow pipe shape, but is not limited thereto, and connects the positive electrode electrolyte storage portion 210 and the negative electrode electrolyte storage portion 220 to exchange electrolyte, ions, and substances This can be done in a variety of tube shapes, if possible.

Physical and chemical balancing is achieved through the exchange of electrolyte, ions, or substances, and detailed descriptions thereof are as follows.

The electrolyte connection part 600 is not limited to being made of a slurry containing at least one selected from the group consisting of water, an aqueous sulfuric acid solution, and an active material, and may be filled with electrolyte, ions, and other materials capable of material exchange.

In addition, the electrolyte connection part 600 may be filled with a porous material. When the mixing of the materials contained in the positive electrode and the negative electrode occurs significantly when balancing by the electrolyte connection part 600 is performed, the performance of the battery may be reduced, but the battery by controlling some of the mixing by the electrolyte connection part 600 through the porous material A decrease in performance can be suppressed.

In the case of the redox flow battery including the fluid control unit 300 as in the embodiment of the present invention, since the pressure inside the fluid control unit 300 changes at any time, the level of the positive electrode electrolyte and the negative electrode electrolyte may change from time to time. have.)

Since such a change does not move the material through the above-described separator 130, battery performance may be reduced when the movement of the material through the electrolyte connection part 600 frequently occurs due to a change in water level. The porous material can suppress the battery performance reduction by suppressing the mixing due to the swaying.

In addition, the porous material can prevent cross contamination by precipitates and impurities contained in the electrolyte. The porous material may be activated carbon, mesh, felt, honeycomb or the like. The porous material may be provided on the entire electrolyte connection portion 600, or may be provided only on a part of the electrolyte connection portion 600.

According to an embodiment of the present invention, the volume of the electrolyte connection part 600 is 1 to 50% of the sum of the electrolyte solution stored in the positive electrode electrolyte storage part 210 and the electrolyte solution stored in the negative electrode electrolyte storage part 220 It is preferred. When the volume of the electrolyte connection portion 600 is large, the energy capacity compared to the unit volume of the battery module 10 may decrease, and when the volume of the electrolyte connection portion 600 is small, the mixing amount of the material included in the positive electrode and the negative electrode increases. Since battery performance may decrease, the volume of the electrolyte connection portion 600 is 1 to 50% of the sum of the electrolyte stored in the positive electrode electrolyte storage portion 210 and the electrolyte stored in the negative electrode electrolyte storage portion 220 It is preferred. The detailed description is as follows.

When the water level of the negative electrode electrolyte storage unit 220 is increased by a material moved from the positive electrode 110 to the negative electrode 120 due to the driving of the redox flow battery, through the electrolyte connection unit 600 A part of the electrolyte solution stored in the cathode electrolyte solution storage unit 220 may be mixed while moving to the cathode electrolyte storage unit 210. (Materials may be moved from the cathode electrode 120 to the anode electrode 110, and the material is moved from the anode electrode 110 to the cathode electrode 120 is only one example.)

At this time, when the length of the electrolyte connection portion 600 is short or small in volume, mixing of the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte of the negative electrode electrolyte storage unit 220 may occur too actively. do. When the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte of the negative electrode electrolyte storage unit 220 are actively mixed, the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220 The cathodic electrolyte may react with each other, resulting in energy loss or side reaction, which results in capacity loss. Due to this, the performance of the battery is reduced.

That is, the length of the electrolyte connection portion 600 is too short or the volume is too small, the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte solution of the negative electrode electrolyte storage unit 220 through the electrolyte connection unit 600 If the mixing is too vigorous, rather the performance of the battery is reduced. To prevent this, the volume of the electrolyte connection part 600 is preferably 1% or more of the sum of the electrolyte solution stored in the positive electrode electrolyte storage part 210 and the electrolyte solution stored in the negative electrode electrolyte solution storage part 220. .

However, if the volume of the electrolyte connection portion 600 is too large, the effects of the positive electrode electrolyte in the positive electrode electrolyte storage portion 210 and the negative electrode electrolyte in the negative electrode electrolyte storage portion 220 decrease or the volume of the battery module 10 is reduced. Since it may be large, the volume of the electrolyte connection portion 600 is preferably 50% or less of the sum of the electrolyte stored in the positive electrode electrolyte storage unit 210 and the electrolyte stored in the negative electrode electrolyte storage unit 220 .

Here, the volume of the electrolyte connection portion 600 is, one end of the electrolyte connection portion 600 is connected to the positive electrode electrolyte storage unit 210, the other end of the electrolyte connection portion 600 is the negative electrode electrolyte storage unit 220 When connected to, represents the volume that can be stored fluid between both ends of the electrolyte connection portion 600.

When the boundary between the both ends of the electrolyte connection portion 600 and the positive electrode electrolyte storage unit 210 or the negative electrode electrolyte storage unit 220 is ambiguous, the positive electrode electrolyte storage unit 210 or the negative electrode electrolyte storage unit 220 Both ends of the electrolyte connection part 600 may be defined based on a starting point of a structure having a cross-sectional area change between the electrolyte connection parts 600.

In addition, the diameter when the diameter of the electrolyte connection portion 600 or the cross-sectional area of the electrolyte connection portion 600 is converted to the same area circle is preferably less than 1/3 of the length of the electrolyte connection portion 600. When the diameter of the electrolyte connecting portion 600 is too large compared to the length, mixing of the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte of the negative electrode electrolyte storage unit 220 becomes active, and thus, as described above, Performance may be degraded.

Therefore, the diameter when the diameter of the electrolyte connection portion 600 or the cross-sectional area of the electrolyte connection portion 600 is converted to the same area circle is preferably less than 1/3 of the length of the electrolyte connection portion 600. Specifically, when the cross-sectional area of the electrolyte connection portion 600 is made of a circle, the diameter of the electrolyte connection portion 600 and the length of the electrolyte connection portion 600 are compared, and the cross-sectional area of the electrolyte connection portion 600 is a circle. If not, it is compared with the diameter when converted into a circle having the same area as the area of the cross-sectional area and the length of the electrolyte connecting portion 600. Here, the length of the electrolyte connection portion 600 represents the entire length of the electrolyte connection portion 600 from one end of the electrolyte connection portion 600 to the other end of the electrolyte connection portion 600.

Referring to FIG. 5, when the electrolyte connection portion 600 is formed of a hollow pipe, the electrolyte connection portion 600 may include a storage portion 610 having a larger cross-sectional area than the hollow pipe. The storage unit 610 has a constant volume in the middle of the electrolyte connection unit 600, and is a space for storing materials capable of exchanging electrolytes, ions, and substances.

As described above, when the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte of the negative electrode electrolyte storage unit 220 are actively mixed, the performance of the battery may be reduced. The storage unit 610 may serve as a buffer of a constant volume to prevent mixing of the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte of the negative electrode electrolyte storage unit 220. will be.

In this case, the storage unit 610 is in the positive electrode electrolyte storage unit 210 to effectively prevent the positive electrode electrolyte solution of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte solution of the negative electrode electrolyte storage unit 220 from being mixed. It is preferable that the sum of the electrolyte solution stored and the electrolyte solution stored in the cathode electrolyte storage unit 220 is 1% or more.

The positive electrode electrolyte and the negative electrode electrolyte storage portion of the positive electrode electrolyte storage portion 210 are minimized while minimizing a decrease in battery performance by providing the storage portion 610 having a constant volume and serving as a buffer. It is possible to improve the balancing effect of 220).

Referring to FIG. 6, the electrolyte connection part 600 may include a connection part valve 620 capable of closing or opening the electrolyte connection part 600. The connection part valve 620 is disposed on the electrolyte connection part 600 and is capable of opening and closing the electrolyte connection part 600.

As described above, when the positive electrode electrolyte solution of the positive electrode electrolyte solution storage unit 210 and the negative electrode electrolyte solution of the negative electrode electrolyte storage unit 220 are actively mixed through the electrolyte connection unit 600, battery performance is reduced. there is a problem. The electrolyte connection part 600 is still open, and mixing of the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte of the negative electrode electrolyte storage unit 220 is active according to the driving conditions of the redox flow battery. There is a risk that it will happen.

The connection portion valve 620 is to prevent this, and the connection portion valve 620 may be provided to close the electrolyte connection portion 600 under specific conditions. For example, in some conditions during the charging or discharging process of the redox flow battery, the amount of the electrolyte component moving through the separator 130 may increase, and thus, a rapid performance decrease may occur. Therefore, in this condition, by closing the electrolyte connection portion 600 through the connection portion valve 620, it is possible to prevent performance degradation of the battery.

The connection part valve 620 may be a valve that can be driven by external pressure or an electric device, or may be controlled through a separate control part. When a control unit is provided in the connection valve 620, when the battery module 10 is charged or discharged, the connection valve 620 closes a portion of the electrolyte connection portion 600, or the electrolyte connection portion 600 You can make the whole close. Here, when only a part of the electrolyte connection part 600 is closed through the connection part valve 620, there is an effect of adjusting the cross-sectional area of the electrolyte connection part 600.

That is, depending on the conditions of charging or discharging of the battery module 10, the electrolyte connection part 600 may be completely closed through the control part of the connection part valve 620, and only part of the electrolyte connection part 600 may be closed. It might be. The connection valve 620 may open and close the electrolyte connection portion 600, or if only a part of the electrolyte connection portion 600 can be closed, various devices may be used.

The electrolyte connection portion 600 is to connect the positive electrode electrolyte storage portion 210 and the negative electrode electrolyte storage portion 220, but if necessary, the electrolyte connection portion 600 is the battery cell 100, the fluid control unit ( 300), may be structurally connected to the electrolyte flow path 400. This means that the electrolyte connection part 600 can be connected to any part of the anode electrolyte and the cathode electrolyte. However, battery performance may vary depending on the mounting position.

That is, the electrolyte connection part 600 is connected to the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220, and at the same time, the battery cell 100, the fluid control unit 300, the electrolyte flow path 400 ) And structurally. According to an embodiment of the present invention, the electrolyte connection portion 600 is not limited to connecting only the positive electrode electrolyte storage portion 210 and the negative electrode electrolyte storage portion 220.

7 to 11 show a redox flow battery according to another embodiment of the present invention. Redox flow map according to another embodiment of the present invention shown in Figures 7 to 11, including a battery cell 100, the electrolyte tank 200, the fluid control unit 300, the electrolyte connection 600 , The connection relation of each component is the same as described above, and only the arrangement relation of each component is changed. The redox flow battery according to another embodiment of the present invention illustrated in FIGS. 7 to 11 includes all the above-described features.

7 is a view showing the internal structure of a battery module according to another embodiment of the present invention, a view when the battery module is viewed from the side, and FIG. 8 shows the internal structure of a battery module according to another embodiment of the present invention , It is a view when the battery module is viewed from the top. The + terminal 710 illustrated in FIG. 7 is electrically connected to a positive electrode 110 or a separator 140 or a conductive material contacting the separator 140 of the battery cell 100, and the-terminal 720 is electrically connected to the negative electrode 120 of the battery cell or the separator 140 or a conductive material in contact with the separator. The + terminal 710 and the-terminal 720 are provided for charging and discharging the redox flow battery.

As described above, the positive electrode electrolyte solution 211 of the positive electrode electrolyte storage unit 210 is transferred to the battery cell 100 through the electrolyte flow path 400 (positive electrode electrolyte flow path 401), and then reacted in the battery cell 100 After that, it returns to the anode electrolyte storage unit 210. Similarly, the negative electrode electrolyte solution 221 of the negative electrode electrolyte storage unit 220 was transferred to the battery cell 100 via the electrolyte flow path 400 (cathode electrolyte flow path 401), and reacted in the battery cell 100 Thereafter, the cathode electrolyte storage unit 220 is returned.

At this time, the positive electrode electrolyte 211 and the negative electrode electrolyte 221 may be transferred to the battery cell 100 through the fluid control unit 300 or returned to the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220. .

7 is a side view showing a battery module according to an embodiment of the present invention, and FIG. 8 is a top view of a battery module according to an embodiment of the present invention. 7 and 8, inside the positive electrode electrolyte storage unit 210, the positive electrode electrolyte 211 may be discharged from the positive electrode electrolyte storage unit 210 toward the battery cell 100. A positive electrode electrolyte inlet 212 is provided at which the outlet 213 and the positive electrode electrolyte 211 may enter the positive electrode electrolyte storage unit 210 from the battery cell 100.

Similarly, inside the negative electrode electrolyte storage unit 220, the negative electrode electrolyte solution 221 may be discharged from the negative electrode electrolyte storage unit 220 toward the battery cell 100 and the negative electrode electrolyte outlet 223 The negative electrode electrolyte solution 221 is provided with a negative electrode electrolyte inlet 222 through which the battery cell 100 can enter into the negative electrode electrolyte storage unit 220.

Referring to FIG. 9, both ends of the electrolyte connection portion 600 are connected to the positive electrode electrolyte storage portion 210 and the negative electrode electrolyte storage portion 220, and one end 611 of the electrolyte connection portion 600 is the It is connected to the anode electrolyte storage unit 210, and the other end 612 of the electrolyte connection unit 600 may be connected to the cathode electrolyte storage unit 220.

At this time, at the position where the ends 611 and 612 of the electrolyte connection portion 600 are connected to the positive electrode electrolyte storage portion 210 or the negative electrode electrolyte storage portion 220, the positive electrode electrolyte storage portion from the battery cell 100 ( 210) or the straight line distance to the inlet 212,222 where the electrolyte enters the cathode electrolyte storage unit 220, the end 611,612 of the electrolyte connection unit 600 is the anode electrolyte storage unit 210 or the cathode electrolyte storage unit At a position connected to 220, the positive electrode electrolyte storage unit 210 or the negative electrode electrolyte storage unit 220 to the battery cell 100 to the outlet of the electrolyte to the outlet (213,223) is more than twice the straight distance desirable.

More specifically, referring to FIG. 9, the distance from one end 611 of the electrolyte connection portion 600 coupled to the positive electrode electrolyte storage unit 210 to the positive electrode electrolyte inlet 212 is the positive electrode electrolyte storage unit. It is preferable that the distance from the end 611 of the electrolyte connection portion 600 coupled to the 210 to the anode electrolyte outlet 213 is more than twice. (Samely, the distance from the other end 612 of the electrolyte connection portion 600 coupled to the negative electrode electrolyte storage portion 220 to the negative electrode electrolyte inlet 222 is the same coupled to the negative electrode electrolyte storage portion 220 It is preferable that the distance from the other end 612 of the electrolyte connection portion 600 to the cathode electrolyte outlet 223 is twice or more.)

That is, the

ends

611 and 612 of the electrolyte connection portion 600 are the positive electrode electrolyte 211 or the negative electrode electrolyte 221 from the positive electrode electrolyte storage unit 210 or the negative electrode electrolyte storage unit 220 to the battery cell 100. ) Than the exit (213,223) exit, the positive electrode electrolyte solution 211 or the negative electrode electrolyte solution (221) entering the positive electrode electrolyte storage unit 210 or the negative electrode electrolyte storage unit 220 from the battery cell 100 (212,222) ).

In this case, the positive electrode electrolyte 211 or the negative electrode electrolyte 221 which is not reacted is mainly disposed at the

outlets

213 and 223 through which the positive electrode electrolyte 211 or the negative electrode electrolyte 221 exits, and the positive electrode electrolyte 211 or the negative electrode electrolyte 221 This is because the reacted positive and negative electrolytes are mainly disposed at the

inlets

212 and 222. When the positive electrode electrolyte 211 or the negative electrode electrolyte 221 reacted with each other is mixed, there is a risk that the performance and capacity of the battery are further reduced.

That is, the

end

611, 612 of the electrolyte connection portion 600 is disposed far away from the

inlet

212, 222 where the positive electrode electrolyte 211 or the negative electrode electrolyte 221 where the reaction proceeds does not decrease the performance and capacity of the battery Is preferred.

10 and 11, the

ends

611 and 612 of the electrolyte connection part 600 are connected to the battery cell 100 from the positive electrode electrolyte storage unit 210 or the negative electrode electrolyte storage unit 220 to the positive electrode electrolyte ( 211) or the cathode electrolyte solution 221, rather than the

exit

213, 223, the battery cell 100 to the cathode electrolyte storage section 210 or the cathode electrolyte storage section 220, the anode electrolyte 211 or cathode electrolyte ( As the 221 is disposed away from the

incoming inlets

212 and 222, the electrolyte connection part 600 may include a storage part 610, and the electrolyte connection part 600 may include a connection part valve 620.

Referring to FIG. 11, a connection part pressure generator 630 capable of transmitting pressure to the connection part valve 620 forming pressure may be connected to the connection part valve 620 according to an embodiment of the present invention. The connection part pressure generator 630 may be the same or share the pressure generator 500 described above, and may selectively form positive or negative pressure in the connection part valve 620. That is, the pressure generator 500 for driving the fluid control unit 300 and the connection unit pressure generator 630 for driving the connection valve 620 may be separately provided, and are independently driven through pressure control while using the same pressure generator. It can be.

The pressure generated by the connection part pressure generator 630 may be transmitted to the connection part valve 620 through a connection part pressure transmission pipe 631, and the connection part valve 620 may receive the pressure generated by the connection part pressure generator 630. A switch 621 operated through may be included. In addition, the connection valve 620 may include a switch operated by electricity.

The switch 621 included in the connection part valve 620 is electrically operated without a separate pressure generator, so that the electrolyte connection part 600 may be closed or opened, and the electrolyte connection part 600 may be partially closed. . In addition, the switch 621 is connected to the pressure generator 630 of the connection unit and operates through the pressure formed in the pressure generator 630 of the connection unit, so that the electrolyte connection unit 600 can be closed or opened, and the electrolyte connection unit ( 600) can be partially closed.

The volume of the electrolyte connection portion 600 is the electrolyte that moves from the anode to the cathode or the cathode to the anode through the separator 130 when the battery module 10 discharged while the electrolyte connection portion 600 is closed. It may be 2% or more of the volume.

When the battery module 10 is charged or the battery module 10 is discharged, the electrolyte connection portion 600 must be closed through the connection valve 620 to prevent a decrease in battery performance. In this state, when the battery module 10 is charged, the electrolyte moves from the positive electrode to the negative electrode or from the negative electrode to the positive electrode. The volume of the electrolyte connection part 600 is the battery in the state where the electrolyte connection part 600 is closed. When charging the module 10, it is preferable that it is 2% or more of the volume of the electrolyte that moves from the anode to the cathode or from the cathode to the anode.

Specifically, the volume of the electrolyte connection portion 600, leaving the electrolyte connection portion 600 in a closed state (there is no path through which the electrolyte can physically move from the positive electrode to the negative electrode except for the separator), the battery module ( 10) When the constant current is charged at a current density of 20 mA / cm ² from the discharged state (single cell reference open voltage 0.6 V) to the reference open voltage 1.5 V (charged state), the anode electrode moves from the anode electrode to the anode electrode. It may be 2% or more of the electrolyte volume. However, this is only one example, and depending on the conditions of charging and discharging, the amount of the electrolyte moving from the anode to the cathode or the cathode to the anode may vary.

As described above, when the volume of the electrolyte connection portion 600 is small, the mixing of the positive electrode electrolyte in the positive electrode electrolyte storage portion 210 and the negative electrode electrolyte in the negative electrode electrolyte storage portion 220 occurs too vigorously. There is a risk of reduced performance. Therefore, the volume of the electrolyte connection portion 600 should be equal to or greater than a certain size.

At this time, the reference is the volume of the electrolyte that moves from the anode to the cathode or the cathode to the anode when charging the battery module 10 discharged while the electrolyte connection portion 600 is closed. When the volume of the electrolyte connecting portion 600 is charged when the battery module 10 discharged while the electrolyte connecting portion 600 is closed, when the volume of the electrolyte moving from the anode to the cathode or the cathode to the anode is 2% or more , It is possible to prevent the mixing of the positive electrode electrolyte of the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte of the negative electrode electrolyte storage unit 220 is too active.

However, as described above, when the volume of the electrolyte connection portion 600 is too large, a balancing effect between the positive electrode electrolyte solution of the positive electrode electrolyte storage portion 210 and the negative electrode electrolyte solution of the negative electrode electrolyte storage portion 220 may be reduced. Therefore, the volume of the electrolyte connection portion 600 is preferably 50% or less of the sum of the electrolyte stored in the positive electrode electrolyte storage unit 210 and the electrolyte stored in the negative electrode electrolyte storage unit 220.

Redox flow battery according to an embodiment of the present invention described above has the following effects.

The redox flow battery according to an embodiment of the present invention can effectively reduce the length of the transport path and increase the efficiency of the battery by providing the electrolyte tank 200 for storing the anode electrolyte and the cathode electrolyte for each battery cell 100 There are advantages. In addition, the redox flow battery according to an embodiment of the present invention, by providing a fluid control unit 300 using pressure instead of having an expensive pump for each battery module, it is possible to secure cost competitiveness, each battery module (10) There is an advantage that can effectively reduce or block the shunt current that can occur between.

In addition, the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220 through the electrolyte connection unit 600 connecting the positive electrode electrolyte storage unit 210 and the negative electrode electrolyte storage unit 220 according to an embodiment of the present invention It has the advantage of being able to maintain the electrolyte balance, and thereby prevent the performance of the battery from being reduced.

As described above, the present invention has been described in detail with reference to preferred embodiments, but 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. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Claims

A battery cell including an anode electrode and a cathode electrode therein; and

An electrolyte tank including an anode electrolyte storage unit and a cathode electrolyte storage unit; and

An electrolyte passage through which the electrolyte is transferred by connecting the electrolyte tank and the battery cell; and

It includes a battery module having a; fluid control unit for transmitting the pressure generated from the outside to the electrolyte passage,

The battery module is provided with one or two or more, the battery module is independently charged and discharged by circulating the electrolyte, or circulating and charging and discharging the electrolyte in the plurality of battery modules,

A redox flow battery further comprising an electrolyte connection portion connecting the positive electrode electrolyte storage portion and the negative electrode electrolyte storage portion.
According to claim 1,

A pressure generator connected to the fluid control unit and capable of transmitting pressure to the fluid control unit by forming pressure;

A redox flow battery provided between the pressure generator and the fluid control unit, and further comprising a pressure control valve capable of selectively transferring positive pressure or negative pressure to the fluid control unit.
According to claim 1,

The electrolyte connection portion,

Redox flow battery characterized in that it is filled with a liquid or slurry containing at least one selected from the group consisting of water, aqueous acid solution, active material.
According to claim 1,

The electrolyte connection portion,

Redox flow battery characterized in that it is filled with a porous material.
According to claim 1,

Redox flow battery, characterized in that the electrolyte connection portion is made of a hollow pipe.
The method of claim 5,

The electrolyte connection portion,

Redox flow battery, characterized in that it comprises a storage section having a larger cross-sectional area than the hollow pipe.
The method of claim 5,

The diameter when the diameter of the electrolyte connection portion or the cross-sectional area of the electrolyte connection portion is converted into a circle of the same area,

Redox flow battery, characterized in that less than 1/3 of the length of the electrolyte connection.
The method of claim 5,

The volume of the electrolyte connection portion,

Redox flow battery, characterized in that 1 to 50% of the sum of the electrolyte stored in the cathode electrolyte storage and the electrolyte stored in the cathode electrolyte storage.
The method of claim 8,

The volume of the electrolyte connection portion,

Redox flow battery, characterized in that at least 2% of the volume of the electrolyte that moves from the positive electrode to the negative electrode or the negative electrode to the positive electrode when charging the battery module discharged in the closed state of the electrolyte connection.
According to claim 1,

The electrolyte connection portion,

Redox flow battery further comprises a connection valve that can open or close the electrolyte connection.
The method of claim 10,

The connection valve, when the battery module is charged or discharged,

Redox flow battery, characterized in that to close a portion of the electrolyte connection portion, or to close the entire electrolyte connection portion.
The method of claim 10,

It is connected to the connection valve, and further comprises a connection pressure generator that can form a pressure to transmit pressure to the connection valve,

Redox flow battery, characterized in that the connection valve includes a switch operated by the connection pressure generator.
The method of claim 10,

Redox flow battery, characterized in that the connection valve includes a switch operated by electricity.
According to claim 1,

Both ends of the electrolyte connection portion are connected to the positive electrode electrolyte storage portion and the negative electrode electrolyte storage portion,

In a position where the end of the electrolyte connection portion is connected to the positive electrode electrolyte storage portion or the negative electrode electrolyte storage portion, a straight line distance from the battery cell to the inlet of the electrolyte into the positive electrode electrolyte storage portion or the negative electrode electrolyte storage portion

Where the end of the electrolyte connection portion is connected to the positive electrode electrolyte storage portion or the negative electrode electrolyte storage portion, twice the straight distance from the positive electrode electrolyte storage portion or the negative electrode electrolyte storage portion to the outlet where the electrolyte exits the battery cell Redox flow battery characterized in that the above.