Flow battery and electrolyte transfer method for flow battery

Abstract

The present invention provides a flow battery, comprising: a positive electrode storage tank group for storing positive electrode electrolyte, a negative electrode storage tank group for storing negative electrode electrolyte, a stack, and a delivery pipeline. The flow battery further comprises: a pneumatic actuator assembly for continuously introducing an actuator gas, and the continuously introduced actuator gas can push the positive electrode electrolyte in the positive electrode storage tank group and the negative electrode electrolyte in the negative electrode storage tank group to flow to the positive electrode and the negative electrode of the stack respectively through the delivery pipeline and flow back to the corresponding positive electrode storage tank group and negative electrode storage tank group. The present invention also provides an electrolyte transfer method for a flow battery. The flow battery and the electrolyte transfer method for a flow battery provided by the present invention solve the problems of electrolyte temperature rise caused by the work of the liquid pump and low stack efficiency in the process of pumping electrolyte by the liquid pump in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage of flow batteries, and particularly to a flow battery and a method for transporting electrolyte of a flow battery. Background Art

[0002] A flow battery is a new type of storage battery, and its main components include electrolyte, stack, diaphragm and bipolar plate. The diaphragm separates the positive reaction chamber and the negative reaction chamber in the stack. The current electrolyte transportation method is to use pumps to separately transport the positive electrolyte and the negative electrolyte to the positive reaction chamber and the negative reaction chamber of the stack for electrochemical reactions, and the bipolar plate is used for electron collection.

[0003] Patent CN101127393A discloses a zinc-nickel flow battery, which consists of a stack formed by connecting multiple battery monomers in series, electrolyte, storage tank, liquid pump and pipeline. Each battery monomer is composed of a nickel electrode positive electrode, a negative current collector deposited with zinc and electrolyte. The electrolyte is an alkaline solution containing zinc. Two battery monomers are connected in series with a bipolar plate. During charge and discharge, the electrolyte continuously flows between the storage tank and the stack under the push of the liquid pump. During charging, zinc is deposited from the electrolyte onto the negative current collector to become the negative active material. During discharge, zinc dissolves from the negative current collector into the electrolyte. This flow battery has the advantages of simple manufacturing process, low cost, high cycle life, etc.

[0004] Patent CN101619465B discloses a method for preparing or regulating the capacity of a vanadium battery solution and its special device. In the method for preparing the vanadium battery solution, the electrolysis device used includes an electrolytic cell group, an anolyte storage tank, a catholyte storage tank, a liquid transportation pipeline and a pump. By adopting the forced convection method, the anolyte and the catholyte respectively stored in the anolyte storage tank and the catholyte storage tank flow through the anode and the cathode of the electrolytic cell group respectively. A voltage is applied between the anode and the cathode of the electrolytic cell group to generate oxygen and direct current that can reduce vanadium compounds. After completing the electrochemical oxidation and reduction reactions, the anolyte and the catholyte flowing through the anode and the cathode of the electrolytic cell group respectively return to the anolyte storage tank and the catholyte storage tank. The preparation method is used for preparing the electrolyte solution for an all-vanadium flow battery and for offline or online restoring the capacity of an all-vanadium flow battery system.

[0005] It can be seen from the above patents CN101127393A and CN101619465B that in both of the above two patents, pumps are used to transport the electrolyte into the stack for electrochemical reactions. However, the existence of the pumps increases the system energy consumption, becomes a potential hazard for system failures, and the electrolyte flow rate output by the pumps is not stable, reducing the efficiency of the stack.

[0006] Therefore, there is an urgent need for a device or method to solve at least one of the above problems. Summary of the Invention

[0007] The purpose of the embodiments of the present invention is to provide a flow battery and an electrolyte transfer method for the flow battery, which are used to solve the problem that in the prior art, during the process of using a liquid pump to transfer the electrolyte to the stack, the electrolyte temperature rises due to the work done by the liquid pump, thereby reducing the efficiency of the stack.

[0008] To achieve the above purpose, the first aspect of the present invention provides a flow battery, including: a positive electrode storage tank group for storing positive electrode electrolyte, a negative electrode storage tank group for storing negative electrode electrolyte, a stack, and a transfer pipeline. The flow battery further includes: a pneumatic actuator assembly for continuously introducing an actuator gas, and the continuously introduced actuator gas can push the positive electrode electrolyte in the positive electrode storage tank group and the negative electrode electrolyte in the negative electrode storage tank group to flow to the positive electrode and negative electrode of the stack respectively through the transfer pipeline and flow back to the corresponding positive electrode storage tank group and negative electrode storage tank group.

[0009] Specifically, the actuator gas is nitrogen.

[0010] Specifically, the positive electrode of the stack is provided with a plurality of positive electrode flow ports, the positive electrode storage tank group is communicated with the positive electrode flow ports, and the positive electrode electrolyte flows to the positive electrode of the stack through the positive electrode flow ports; the negative electrode of the stack is provided with a plurality of negative electrode flow ports, the negative electrode storage tank group is communicated with the negative electrode flow ports, and the negative electrode electrolyte flows to the negative electrode of the stack through the negative electrode flow ports.

[0011] Specifically, the positive electrode storage tank group includes: a plurality of positive electrode storage tanks, each positive electrode storage tank is provided with a positive electrode inlet and outlet for the entry and exit of the positive electrode electrolyte, and the positive electrode inlet and outlet on each positive electrode storage tank are communicated with the corresponding positive electrode flow ports; the negative electrode storage tank group includes: a plurality of negative electrode storage tanks, each negative electrode storage tank is provided with a negative electrode inlet and outlet for the entry and exit of the negative electrode electrolyte, and the negative electrode inlet and outlet on each negative electrode storage tank are communicated with the corresponding negative electrode flow ports.

[0012] Specifically, the flow battery further includes: a plurality of groups of reversing valves, and a group of reversing valves is installed between every two positive electrode storage tanks, and a group of the reversing valves is installed between every two negative electrode storage tanks.

[0013] Specifically, the pneumatic actuator assembly includes: a plurality of actuator units; one actuator unit is installed in cooperation with each positive electrode storage tank, and the actuator unit is used for continuously introducing an actuator gas; one actuator unit is installed in cooperation with each negative electrode storage tank, and the actuator unit is used for continuously introducing an actuator gas.

[0014] Specifically, the flow battery further includes multiple groups of control components, and one of the control components is installed on each of the execution units. The control component is used to control the flow rate of the execution gas introduced into the execution unit corresponding to the installation thereof.

[0015] Specifically, each of the control components includes a flow rate detection device and an electric control device; the flow rate detection device is used to detect the flow rate of the positive electrolyte at the positive electrode inlet and outlet of the corresponding positive electrode storage tank, or to detect the flow rate of the negative electrolyte at the negative electrode inlet and outlet of the corresponding negative electrode storage tank; the electric control device is used to control the flow rate of the execution gas introduced into the execution unit installed in cooperation with the positive electrode storage tank according to the flow rate of the positive electrolyte at the positive electrode inlet and outlet of the corresponding positive electrode storage tank, or to control the flow rate of the execution gas introduced into the execution unit installed in cooperation with the negative electrode storage tank according to the flow rate of the negative electrolyte at the negative electrode inlet and outlet of the corresponding negative electrode storage tank.

[0016] Specifically, each of the control components further includes a gas flow rate detection device, and the gas flow rate detection device is used to detect the flow rate of the execution gas introduced into the corresponding execution unit.

[0017] Specifically, the execution unit is a cylinder, and by delivering the execution gas to the cylinder, the positive electrolyte and the negative electrolyte are pushed to flow to the positive electrode and the negative electrode of the stack.

[0018] Specifically, the execution unit is a gas delivery device, which is used to deliver the execution gas to the positive electrode storage tank group and the negative electrode storage tank group to push the positive electrolyte and the negative electrolyte to flow to the positive electrode and the negative electrode of the stack.

[0019] On the other hand, the present invention provides a method for transferring the electrolyte of a flow battery. The method for transferring the electrolyte of the flow battery is applied to the above-mentioned flow battery. The method for transferring the electrolyte of the flow battery includes: continuously delivering the execution gas to push the positive electrolyte in the positive electrode storage tank group and the negative electrolyte in the negative electrode storage tank group to flow through the delivery pipeline to the positive electrode and the negative electrode of the stack and then flow back to the corresponding positive electrode storage tank group and negative electrode storage tank group.

[0020] Through the above technical solution, the pneumatic execution component is used to continuously introduce the execution gas to push the positive electrolyte in the positive electrode storage tank group and the negative electrolyte in the negative electrode storage tank group to flow to the positive electrode and the negative electrode of the stack respectively for electrochemical reaction, and then continuously push the positive electrolyte and the negative electrolyte flowing into the stack to flow back to the corresponding positive electrode storage tank group and negative electrode storage tank group. By using the execution gas to push the positive electrolyte and the negative electrolyte to flow, the temperature rise of the electrolyte is avoided, the problem of low efficiency of the stack is solved, and the energy consumption is reduced at the same time.

[0021] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific embodiment part. Brief Description of the Drawings

[0022] The drawings are used to provide a further understanding of the embodiments of the present invention and form a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0023] Figure 1 is a schematic diagram of a flow battery provided by an embodiment of the present invention.

[0024] Description of Reference Numerals

[0025] Detailed Description of the Embodiments

[0026] The following is a detailed description of the specific embodiments of the present invention with reference to the drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0027] In the embodiments of the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are generally used in relation to the directions shown in the drawings or in relation to the vertical, perpendicular or gravitational directions for describing the relative positions of the components.

[0028] Figure 1 is a schematic diagram of a flow battery provided by an embodiment of the present invention.

[0029] As Figure 1 shown, in a first aspect of the present invention, a flow battery is provided, including: a positive electrode storage tank group 1 for storing positive electrode electrolyte, a negative electrode storage tank group 2 for storing negative electrode electrolyte, a stack 3, and a delivery pipeline 4. The flow battery further includes: a pneumatic actuator assembly 5 for continuously introducing an actuator gas, and the continuously introduced actuator gas can push the positive electrode electrolyte in the positive electrode storage tank group 1 and the negative electrode electrolyte in the negative electrode storage tank group 2 to flow to the positive electrode and the negative electrode of the stack 3 respectively through the delivery pipeline 4 and flow back to the corresponding positive electrode storage tank group 1 and negative electrode storage tank group 2.

[0030] The flow battery provided by the present invention continuously introduces an actuating gas through a pneumatic actuating assembly 5 to push the positive electrolyte stored in the positive electrolyte storage tank group 1 to flow to the positive electrode of the stack 3 through a delivery pipeline 4 and push the negative electrolyte stored in the negative electrolyte storage tank group 2 to flow to the negative electrode of the stack 3 through the delivery pipeline 4. The actuating gas is nitrogen. By continuously introducing the actuating gas through the pneumatic actuating assembly 5, the positive electrolyte and the negative electrolyte are pushed to flow to the positive electrode and the negative electrode of the stack 3 respectively for an electrochemical reaction, avoiding the problems of electrolyte temperature rise and stack efficiency reduction caused by the work of the liquid pump when using the liquid pump to pump the electrolyte. At the same time, the pneumatic actuating assembly 5 is more energy-efficient than the liquid pump.

[0031] In one embodiment, in order to enable the positive electrolyte or the negative electrolyte flowing to the positive electrode or the negative electrode of the stack 3 to finally flow back to the positive electrolyte storage tank group 1 and the negative electrolyte storage tank group 2, specifically, a plurality of positive electrode circulation ports 31 are provided at the positive electrode of the stack 3, the positive electrolyte storage tank group 1 is communicated with the positive electrode circulation ports 31, and the positive electrolyte flows to the positive electrode of the stack 3 through the positive electrode circulation ports 31; a plurality of negative electrode circulation ports 32 are provided at the negative electrode of the stack 3, the negative electrolyte storage tank group 2 is communicated with the negative electrode circulation ports 32, and the negative electrolyte flows to the negative electrode of the stack 3 through the negative electrode circulation ports 32. The positive electrolyte storage tank group 1 includes: a plurality of positive electrolyte storage tanks 11, and each positive electrolyte storage tank 11 is provided with a positive electrode inlet / outlet 110 for the entry and exit of the positive electrolyte, and the positive electrode inlet / outlet 110 on each positive electrolyte storage tank 11 is communicated with the corresponding positive electrode circulation port 31; the negative electrolyte storage tank group 2 includes: a plurality of negative electrolyte storage tanks 21, and each negative electrolyte storage tank 21 is provided with a negative electrode inlet / outlet 210 for the entry and exit of the negative electrolyte, and the negative electrode inlet / outlet 210 on each negative electrolyte storage tank 21 is communicated with the corresponding negative electrode circulation port 32. The pneumatic actuating assembly 5 includes: a plurality of actuating units 51; one actuating unit 51 is cooperatively installed on each positive electrolyte storage tank 11, and the actuating unit 51 is used for continuously introducing the actuating gas; one actuating unit 51 is cooperatively installed on each negative electrolyte storage tank 21, and the actuating unit 51 is used for continuously introducing the actuating gas.

[0032] As Figure 1 shown, the positive electrolyte storage tank group 1 includes two positive electrolyte storage tanks 11, the negative electrolyte storage tank group 2 includes two negative electrolyte storage tanks 21, two positive electrode circulation ports 31 are provided at the positive electrode of the stack 3, two negative electrode circulation ports 32 are provided at the negative electrode, the positive electrode inlet / outlet 110 of the positive electrolyte storage tank 11 is in one-to-one correspondence and communicated with the positive electrode circulation port 31 through the delivery pipeline 4, the negative electrode inlet / outlet 210 of the negative electrolyte storage tank 21 is in one-to-one correspondence and communicated with the negative electrode circulation port 32 through the delivery pipeline 4, and one actuating unit 51 is cooperatively installed on each positive electrolyte storage tank 11 and each negative electrolyte storage tank 21. For the convenience of description, as Figure 1 shown, Figure 1The upper positive electrolyte storage tank 11 is named Tank A, and Figure 1 the lower positive electrolyte storage tank 11 is named Tank B, and Figure 1 the upper negative electrolyte storage tank 21 is named Tank C, and Figure 1 the lower negative electrolyte storage tank 21 is named Tank D. When the fuel cell stack 3 undergoes an electrochemical reaction, the actuator gas is continuously introduced through the actuator unit 51 installed in cooperation with Tank A, so as to push the positive electrolyte in Tank A to flow out from the positive inlet / outlet 110 of Tank A, pass through the delivery pipeline 4, and flow into the positive electrode of the fuel cell stack 3 from the corresponding positive flow port 31, and undergo an electrochemical reaction with the negative electrolyte flowing into the negative electrode of the fuel cell stack 3. After that, the actuator gas continuously pushes the positive electrolyte in the positive electrode to flow and flow out from the other positive flow port 31 of the positive electrode of the fuel cell stack 3, pass through the delivery pipeline 4, and flow into Tank B from the positive inlet / outlet 110 of Tank B. At the same time, the actuator gas is continuously introduced through the actuator unit 51 installed in cooperation with Tank C, so as to push the negative electrolyte in Tank C to flow out from the negative inlet / outlet 210 of Tank C, pass through the delivery pipeline 4, and flow into the negative electrode of the fuel cell stack 3 from the corresponding negative flow port 32, and undergo an electrochemical reaction with the positive electrolyte flowing into the positive electrode of the fuel cell stack 3 at the same time. After that, the actuator gas continuously pushes the negative electrolyte in the negative electrode to flow and flow out from the other negative flow port 32 of the negative electrode of the fuel cell stack 3, pass through the delivery pipeline 4, and flow into Tank D from the negative inlet / outlet 210 of Tank D.

[0033] In order to ensure the continuous delivery of the positive electrolyte and the negative electrolyte to the fuel cell stack 3 and ensure that the fuel cell stack 3 can continuously undergo an electrochemical reaction, the flow battery further includes: a plurality of groups of reversing valves 6. One group of reversing valves 6 is installed between every two positive electrolyte storage tanks 11, and one group of the reversing valves 6 is installed between every two negative electrolyte storage tanks 21. For example, one group of reversing valves 6 is installed between Tank A and Tank B, and one group of reversing valves 6 is installed between Tank C and Tank D. In this way, after 95% of the positive electrolyte in Tank A flows into Tank B or 95% of the negative electrolyte in Tank C flows into Tank D, the reversing valve between Tank A and Tank B or the reversing valve 6 between Tank C and Tank D is immediately opened, and the positive electrolyte in Tank B is quickly returned to Tank A or the negative electrolyte in Tank D is quickly returned to Tank C through the reversing valve 6. In this way, it can be ensured that the positive electrolyte and the negative electrolyte are continuously delivered to the fuel cell stack 3. Repeating this process can complete the continuous electrochemical reaction in the fuel cell stack 3. Moreover, the electrolyte delivery method in the present application is different from the prior art, avoiding the temperature rise of the electrolyte and improving the efficiency of the fuel cell stack 3.

[0034] During the process of continuously introducing the actuating gas using the pneumatic actuating assembly 5, in order to control the stable flow rate of the introduced actuating gas, specifically, the flow battery further includes multiple control assemblies, and one of the control assemblies is installed on each of the actuating units 51. The control assembly is used to control the flow rate of the actuating gas introduced into the corresponding actuating unit 51. Each control assembly includes a flow rate detection device 7 and an electric control device 8. The flow rate detection device 7 is used to detect the flow rate of the positive electrolyte at the positive electrode inlet / outlet 110 of the corresponding positive electrode storage tank 11, or to detect the flow rate of the negative electrolyte at the negative electrode inlet / outlet 210 of the corresponding negative electrode storage tank 21. The electric control device 8 is used to control the flow rate of the actuating gas introduced into the actuating unit 51 that is installed in cooperation with the corresponding positive electrode storage tank 11 according to the flow rate of the positive electrolyte at the positive electrode inlet / outlet 110 of the corresponding positive electrode storage tank 11, or to control the flow rate of the actuating gas introduced into the actuating unit 51 that is installed in cooperation with the corresponding negative electrode storage tank 21 according to the flow rate of the negative electrolyte at the negative electrode inlet / outlet 210 of the corresponding negative electrode storage tank 21. By detecting the flow rate of the positive electrolyte at the positive electrode inlet / outlet 110 of the positive electrode storage tank 11 that is installed in cooperation with the actuating unit 51, the flow rate of the actuating gas continuously introduced into the actuating unit 51 is controlled, or by detecting the flow rate of the negative electrolyte at the negative electrode inlet / outlet 210 of the negative electrode storage tank 21 that is installed in cooperation with the actuating unit 51, the flow rate of the actuating gas continuously introduced into the actuating unit 51 is controlled. In this way, the flow rate of the continuously introduced actuating gas can be ensured to be stable, thereby ensuring the stable flow rates of the positive electrolyte and the negative electrolyte delivered to the fuel cell stack 3 through the actuating gas, ensuring the smooth supply of the positive electrolyte and the negative electrolyte fed into the fuel cell stack 3, and improving the efficiency of the flow battery.

[0035] In order to better know the flow rate of the continuously introduced actuating gas, specifically, each of the control assemblies further includes a gas flow rate detection device 9, and the gas flow rate detection device 9 is used to detect the flow rate of the actuating gas introduced into the corresponding actuating unit 51.

[0036] In one embodiment, the actuating unit 51 is a cylinder. By delivering the actuating gas to the cylinder, the positive electrolyte and the negative electrolyte are pushed to flow to the positive electrode and the negative electrode of the fuel cell stack 3. Nitrogen is delivered into the cylinder, and the positive electrolyte in the positive electrode storage tank 11 or the negative electrolyte in the negative electrode storage tank 21 is driven to flow by the cylinder, avoiding the positive electrolyte or the negative electrolyte from being heated during the transmission process.

[0037] In another embodiment, the actuating unit 51 is a gas delivery device, which is used to deliver the actuating gas to the positive electrode storage tank group 1 and the negative electrode storage tank group 2 to push the positive electrolyte and the negative electrolyte to flow to the positive electrode and the negative electrode of the fuel cell stack 3. Nitrogen is directly input into the positive electrode storage tank group 1 and the negative electrode storage tank 2 as the actuating gas through the actuating unit 51, and the positive electrolyte and the negative electrolyte are driven to flow by the nitrogen.

[0038] On the other hand, the present invention provides a method for transferring electrolyte of a flow battery. The method for transferring electrolyte of the flow battery is applied to the above-mentioned flow battery, and the method for transferring electrolyte of the flow battery includes: continuously delivering an actuating gas to push the positive electrolyte in the positive electrode storage tank group 1 and the negative electrolyte in the negative electrode storage tank group 2 to flow through the delivery pipeline 4 to the positive and negative electrodes of the stack 3 and then flow back to the corresponding positive electrode storage tank group 1 and negative electrode storage tank group 2.

[0039] The present invention provides a method for transferring electrolyte of a flow battery. The positive electrolyte and the negative electrolyte are driven by the continuously delivered actuating gas to flow to the positive and negative electrodes of the stack 3 for an electrochemical reaction. The actuating gas is nitrogen. Driving the positive electrolyte and the negative electrolyte to flow by the actuating gas reduces the temperature rise of the positive electrolyte and the negative electrolyte, reduces the energy consumption, and improves the efficiency of the flow battery.

[0040] For the flow battery provided by the present invention, the actuating gas is continuously introduced through the pneumatic actuating assembly 5 to push the positive electrolyte and the negative electrolyte to flow to the positive and negative electrodes of the stack 3 for an electrochemical reaction. The present invention also provides a method for transferring electrolyte of a flow battery. The flow battery and the method for transferring electrolyte of the flow battery provided by the present invention solve the problems of temperature rise of the electrolyte caused by the work of the liquid pump and low efficiency of the stack in the prior art during the process of pumping the electrolyte by the liquid pump.

[0041] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0042] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0043] Those skilled in the art can understand that all or part of the steps in the methods for implementing the above embodiments can be completed by instructing relevant hardware through a program. The program is stored in a storage medium and includes several instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks or optical discs.

[0044] In addition, any combination can be made among various different embodiments of the present invention as long as it does not violate the idea of the embodiments of the present invention, and it should equally be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A flow battery, comprising: A positive electrode storage tank group (1) for storing positive electrode electrolyte, a negative electrode storage tank group (2) for storing negative electrode electrolyte, a stack (3), and a delivery pipeline (4), characterized in that the flow battery further comprises: A pneumatic actuator assembly (5) for continuously introducing an actuator gas, and the continuously introduced actuator gas can push the positive electrode electrolyte in the positive electrode storage tank group (1) and the negative electrode electrolyte in the negative electrode storage tank group (2) to flow to the positive electrode and the negative electrode of the stack (3) respectively through the delivery pipeline (4) and flow back to the corresponding positive electrode storage tank group (1) and negative electrode storage tank group (2); A plurality of positive electrode flow ports (31) are provided at the positive electrode of the stack (3), the positive electrode storage tank group (1) is communicated with the positive electrode flow ports (31), and the positive electrode electrolyte flows to the positive electrode of the stack (3) through the positive electrode flow ports (31); A plurality of negative electrode flow ports (32) are provided at the negative electrode of the stack (3), the negative electrode storage tank group (2) is communicated with the negative electrode flow ports (32), and the negative electrode electrolyte flows to the negative electrode of the stack (3) through the negative electrode flow ports (32); The positive electrode storage tank group (1) comprises: a plurality of positive electrode storage tanks (11), and each positive electrode storage tank (11) is provided with a positive electrode inlet / outlet (110) for the positive electrode electrolyte to enter and exit, and the positive electrode inlet / outlet (110) on each positive electrode storage tank (11) is communicated with the corresponding positive electrode flow port (31); The negative electrode storage tank group (2) comprises: a plurality of negative electrode storage tanks (21), and each negative electrode storage tank (21) is provided with a negative electrode inlet / outlet (210) for the negative electrode electrolyte to enter and exit, and the negative electrode inlet / outlet (210) on each negative electrode storage tank (21) is communicated with the corresponding negative electrode flow port (32); The flow battery further comprises: a plurality of groups of reversing valves (6), one group of reversing valves (6) is installed between every two positive electrode storage tanks (11), and through this group of reversing valves (6), the positive electrode electrolyte in one positive electrode storage tank (11) can enter another positive electrode storage tank (11), and one group of the reversing valves (6) is installed between every two negative electrode storage tanks (21), and through this group of reversing valves (6), the negative electrode electrolyte in one negative electrode storage tank (21) can enter another negative electrode storage tank (21).

2. The flow battery according to claim 1, wherein, The actuator gas is nitrogen.

3. The flow battery according to claim 1, characterized in that, The pneumatic actuator assembly (5) comprises: a plurality of actuator units (51); One actuator unit (51) is cooperatively installed on each positive electrode storage tank (11), and the actuator unit (51) is used for continuously introducing an actuator gas; One actuator unit (51) is cooperatively installed on each negative electrode storage tank (21), and the actuator unit (51) is used for continuously introducing an actuator gas.

4. The flow battery according to claim 3, wherein The flow battery further comprises a plurality of groups of control components, one control component is installed on each actuator unit (51), and the control component is used for controlling the flow rate of the actuator gas introduced into the actuator unit (51) corresponding to it.

5. The flow battery according to claim 4, wherein Each control component comprises a flow rate detection device (7) and an electric control device (8); The flow detection device (7) is used to detect the flow of the positive electrode electrolyte at the positive electrode inlet and outlet (110) of the corresponding positive electrode storage tank (11), or to detect the flow of the negative electrode electrolyte at the negative electrode inlet and outlet (210) of the corresponding negative electrode storage tank (21); The electric control device (8) is used to control the flow rate of an actuating gas introduced into an actuating unit (51) installed in cooperation with the positive electrode storage tank (11) according to the flow rate of a positive electrode electrolyte at a positive electrode inlet and outlet (110) of a corresponding positive electrode storage tank (11), or to control the flow rate of an actuating gas introduced into an actuating unit (51) installed in cooperation with the negative electrode storage tank (21) according to the flow rate of a negative electrode electrolyte at a negative electrode inlet and outlet (210) of a corresponding negative electrode storage tank (21).

6. The flow battery according to claim 5, characterized in that, Each of the control components further comprises a gas flow detection device (9), wherein the gas flow detection device (9) is used to detect the flow of the execution gas introduced into the corresponding execution unit (51).

7. The flow battery according to claim 5, wherein The execution unit (51) is a cylinder, and the positive electrode electrolyte and the negative electrode electrolyte are pushed to flow to the positive electrode and the negative electrode of the battery stack (3) by delivering execution gas to the cylinder.

8. The flow battery according to claim 5, characterized in that, The execution unit (51) is a gas supply device, used to deliver execution gas to the positive electrode storage tank group (1) and the negative electrode storage tank group (2) to push the positive electrode electrolyte and the negative electrode electrolyte to flow to the positive electrode and the negative electrode of the battery stack (3).

9. A method for transmitting electrolyte of a flow battery, characterized in that The electrolyte delivery method of the liquid flow battery is applied to the liquid flow battery according to any one of claims 1 to 8, and the electrolyte delivery method of the liquid flow battery comprises: By continuously delivering the execution gas, the positive electrode electrolyte in the positive electrode storage tank group (1) and the negative electrode electrolyte in the negative electrode storage tank group (2) are pushed to flow to the positive electrode and the negative electrode of the battery stack (3) through the delivery pipeline (4) and flow back to the corresponding positive electrode storage tank group (1) and the negative electrode storage tank group (2).

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