Non-flat-layer arrangement flow battery

Abstract

The utility model provides a non-flat-layer flow battery which comprises an anode storage tank, an anode pump, an anode liquid supply pipe, an electric pile and an anode liquid return pipe which are communicated in sequence, an anode buffer tank is communicated to the anode liquid return pipe through a first liquid phase branch and is communicated to an upper gas space of the anode storage tank through a first gas phase branch; an anode liquid level sensor is arranged on the anode buffer tank; the negative electrode storage tank, the negative electrode pump, the negative electrode liquid supply pipe, the electric pile and the negative electrode liquid return pipe are sequentially communicated, the negative electrode buffer tank is communicated to the negative electrode liquid return pipe through a second liquid phase branch and is communicated to the upper gas space of the negative electrode storage tank through a second gas phase branch, and a negative electrode liquid level sensor is arranged on the negative electrode buffer tank. The utility model prevents the galvanic pile from generating negative pressure, protects the safety of the redox flow battery, and is beneficial to the stable operation of the redox flow battery.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to the technical field of liquid flow battery, especially to a non-flat layer arrangement liquid flow battery. BACKGROUND

[0002] The liquid flow battery is mainly composed of positive and negative electrode storage tanks, an electric pile, an electrolyte circulating pump, electrolyte pipelines, auxiliary thermal management equipment, a battery management system and the like. During the working process of the liquid flow battery, the electrolyte in the positive and negative electrode storage tanks flows through the electrolyte circulating system and the electric pile under the pushing of the circulating pump, and an electrochemical reaction occurs in the electric pile, so that the active substance concentration of the electrolyte entering the electric pile changes, and then the electrolyte returns to the positive and negative electrode storage tanks and mixes with the electrolyte in the storage tanks.

[0003] Compared with lithium batteries, the liquid flow battery has a larger floor area due to its lower energy density. In order to save land occupation or initial construction cost investment, the power box (power part) is often arranged above the capacity box (storage tank), or the storage tank and the power part are arranged in two layers of buildings. The electric pile in the power box is arranged at a high position relative to the storage tank. At the moment when the circulating pump stops, the electric pile at the high position of the entire liquid flow battery system is in a negative pressure state. For example, for the liquid flow battery arranged in the upper and lower layers, the electric pile arranged on the second floor of the building is 5m higher than the liquid surface of the storage tank arranged on the first floor. When the system normally circulates, all places are under positive pressure, and at the moment when the pump stops, the electric pile at the high position of the system will generate a negative pressure of about 0.067MPa. The negative pressure brings severe challenges to the sealing property of the electric pile, the resistance of the membrane and the sealing property of the pipeline. The positive and negative pressure alternation in the frequent start-stop process is more likely to cause fatigue damage.

[0004] In the prior art, a negative pressure protection pipe can be added to the liquid return pipeline. The negative pressure protection pipe adopts methods such as opening and installing a one-way valve. These methods all use the negative pressure generated when the liquid flow battery system stops to suck gas into the system, gradually improving the pressure state of the system. Essentially, the liquid flow battery system will still generate negative pressure by using this method, and during the process of changing the negative pressure state of the liquid flow battery system by sucking gas, gas-liquid two-phase flow will be generated, the pressure will fluctuate greatly, and the pressure in the electric pile and the liquid pipeline will be extremely unstable in a short time, which is not conducive to maintaining the stable pressure on both sides of the membrane in the electric pile and is difficult to control. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a non-flat layer arrangement liquid flow battery, which avoids negative pressure generated by the electric pile, protects the safety of the liquid flow battery and is beneficial to stable operation of the liquid flow battery.

[0006] To solve the above technical problems, the utility model provides a kind of non-flat layer arrangement liquid flow battery, comprising: positive pole storage tank, positive pole pump, positive pole liquid supply pipe, electric pile, positive pole liquid return pipe are sequentially communicated;It is provided with positive pole buffer tank, the positive pole buffer tank is connected by first liquid phase branch to the positive pole liquid return pipe, by first gaseous phase branch is connected to the upper gas space of the positive pole storage tank;Positive pole liquid level sensor is arranged on the positive pole buffer tank;Wherein the height where the positive pole buffer tank is located is greater than the height where the electric pile is located, the height where the electric pile is located is greater than the height where the positive pole storage tank is located;Negative pole storage tank, negative pole pump, negative pole liquid supply pipe, electric pile, negative pole liquid return pipe are sequentially communicated;It is provided with negative pole buffer tank, the negative pole buffer tank is connected by second liquid phase branch to the negative pole liquid return pipe, by second gaseous phase branch is connected to the upper gas space of the negative pole storage tank;Negative pole liquid level sensor is arranged on the negative pole buffer tank;Wherein the height where the negative pole buffer tank is located is greater than the height where the electric pile is located, the height where the electric pile is located is greater than the height where the negative pole storage tank is located.

[0007] Optionally, the first liquid phase branch includes: a positive pole liquid phase communication pipe connecting the positive pole buffer tank and the positive pole liquid return pipe, and a positive pole liquid phase communication valve arranged on the positive pole liquid phase communication pipe; and / or the second liquid phase branch includes: a negative pole liquid phase communication pipe connecting the negative pole buffer tank and the negative pole liquid return pipe, and a negative pole liquid phase communication valve arranged on the negative pole liquid phase communication pipe.

[0008] Optionally, further comprising: a third liquid phase branch, the positive pole buffer tank is connected to the positive pole storage tank through the third liquid phase branch; and / or a fourth liquid phase branch, the negative pole buffer tank is connected to the negative pole storage tank through the fourth liquid phase branch.

[0009] Optionally, the third liquid phase branch includes: a positive pole liquid discharge pipe connecting the positive pole buffer tank and the positive pole storage tank, and a positive pole liquid discharge valve arranged on the positive pole liquid discharge pipe; and / or the fourth liquid phase branch includes: a negative pole liquid discharge pipe connecting the negative pole buffer tank and the negative pole storage tank, and a negative pole liquid discharge valve arranged on the negative pole liquid discharge pipe.

[0010] Optionally, further comprising: a positive pole overflow pipe, one end of the positive pole overflow pipe is connected to the positive pole buffer tank, and the other end is connected to the positive pole storage tank or a side of the positive pole liquid discharge pipe close to the positive pole storage tank; and / or a negative pole overflow pipe, one end of the negative pole overflow pipe is connected to the negative pole buffer tank, and the other end is connected to the negative pole storage tank or a side of the negative pole liquid discharge pipe close to the negative pole storage tank.

[0011] Optionally, the height of the positive pole overflow pipe is slightly higher than the height of the positive pole liquid level sensor; and / or the height of the negative pole overflow pipe is slightly higher than the height of the negative pole liquid level sensor.

[0012] Optionally, the first liquid phase branch is communicated to the bottom of the positive electrode buffer tank, and the third liquid phase branch is communicated to the side of the positive electrode buffer tank; and / or the second liquid phase branch is communicated to the bottom of the negative electrode buffer tank, and the fourth liquid phase branch is communicated to the side of the negative electrode buffer tank.

[0013] Optionally, the first gas phase branch comprises a positive electrode gas phase communication pipe communicated between the positive electrode buffer tank and the upper gas space of the positive electrode storage tank; and / or the second gas phase branch comprises a negative electrode gas phase communication pipe communicated between the negative electrode buffer tank and the upper gas space of the negative electrode storage tank.

[0014] Compared with the prior art, the utility model has the advantages that: in the process of stopping the liquid flow battery, the negative pressure is avoided, and the instantaneous impact force generated by stopping the circulating pump is relieved; in the process of starting the liquid flow battery, the gas in the liquid flow battery is discharged, the negative pressure is prevented, and the stable operation of the liquid flow battery system is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this application, illustrate embodiments of the present application, and together with the description serve to explain the principle of the present application. In the drawings:

[0016] Figure 1 is a structural schematic view of the liquid flow battery arranged in a non-flat layer according to an embodiment of the utility model;

[0017] Figure 2 is a schematic view of gas-liquid flow in the process of stopping according to an embodiment of the utility model;

[0018] Figure 3 is a schematic view of gas-liquid flow in the process of starting according to an embodiment of the utility model.

[0019] In each drawing, the hollow arrow indicates the gas flow direction, and the solid arrow indicates the liquid flow direction.

[0020] In the drawings:

[0021] 101-positive electrode storage tank, 102-positive electrode pump, 103-positive electrode liquid supply pipe, 105-positive electrode liquid return pipe, 106-positive electrode buffer tank, 107-positive electrode liquid phase communication valve, 108-positive electrode gas phase communication pipe, 109-positive electrode overflow pipe, 110-positive electrode liquid phase communication pipe, 111-positive electrode liquid level sensor, 112-positive electrode liquid discharge valve, 113-positive electrode liquid discharge pipe;

[0022] 201 - negative electrode storage tank, 202 - negative electrode pump, 203 - negative electrode liquid supply pipe, 205 - negative electrode liquid return pipe, 206 - negative electrode buffer tank, 207 - negative electrode liquid phase communication valve, 208 - negative electrode gas phase communication pipe, 209 - negative electrode overflow pipe, 210 - negative electrode liquid phase communication pipe, 211 - negative electrode liquid level sensor, 212 - negative electrode liquid discharge valve, 213 - negative electrode liquid discharge pipe;

[0023] 300 - stack. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some examples or embodiments of the present application, and for those skilled in the art, the present application can also be applied to other similar scenarios without creative labor. Unless it is obvious from the language environment or otherwise stated, the same reference numbers in the drawings represent the same structure or operation.

[0025] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0026] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application. In addition, although the terms used in the present application are selected from the commonly known and used terms, some terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and the detailed meaning of each term is explained in the relevant part of the description. In addition, the present application is not only required to be understood by the actual terms used, but also by the meaning implied by each term.

[0027] The present embodiment provides a non-planar flow battery, which refers to Figure 1As shown, mainly includes: positive tank 101, positive pump 102, positive liquid supply pipe 103, stack 300, positive return pipe 105 in turn. Positive buffer tank 106 is provided, positive buffer tank 106 is connected to the positive return pipe 105 through the first liquid phase branch, and is connected to the upper gas space of the positive tank 101 through the first gas phase branch. Positive buffer tank 106 is provided with a positive liquid level sensor 111. The height of the positive buffer tank 106 is greater than the height of the stack 300, and the height of the stack 300 is greater than the height of the positive tank 101. The negative tank 201, the negative pump 202, the negative liquid supply pipe 203, the stack 300, the negative return pipe 205 are connected in turn. Negative buffer tank 206 is provided, negative buffer tank 206 is connected to the negative return pipe 205 through the second liquid phase branch, and is connected to the upper gas space of the negative tank 201 through the second gas phase branch. Negative buffer tank 206 is provided with a negative liquid level sensor 211. The height of the negative buffer tank 206 is greater than the height of the stack 300, and the height of the stack 300 is greater than the height of the negative tank 201.

[0028] The positive side of the flow battery is taken as an example for description, and the negative side is also the same principle. The subsequent examples of the positive side are also applicable to the examples of the negative side, which will not be described here. The positive buffer tank 106 is arranged at a high position of the flow battery. When the flow battery enters the shutdown process, the positive pump 102 is still working in the first period of time. At this time, since the first liquid phase branch is in a pass-through state, the positive electrolyte flowing out of the stack will flow into the positive buffer tank 106. Then, when the positive pump 102 stops working, the positive buffer tank 106 is connected to the stack 300, the positive tank 101 and the positive liquid pipeline, and the liquid level of the positive buffer tank 106 is higher than that of the positive tank 101, so that a positive pressure is generated on the stack 300 and the positive liquid pipeline, and thus the stack 300 will not generate a negative pressure due to the stop of the positive pump 102. Subsequently, the electrolyte in the positive buffer tank 106, the stack 300 and the positive liquid pipeline flows back to the positive tank 101 under the action of the liquid level difference between the positive buffer tank 106 and the positive tank 101, and the positive buffer tank 106, the stack 300 and the positive liquid pipeline are gradually emptied. The gas and the liquid flow in the same direction and will not form two-phase reverse flow.

[0029] It can be seen that the positive buffer tank 106 added in the flow battery changes the pressure state of the entire flow battery during shutdown, avoids the generation of negative pressure in the stack 300, and protects the safety of the flow battery. It should be noted that the flow battery of the embodiment does not need to additionally increase a pump or the like to supplement the positive buffer tank 106. The positive buffer tank 106 at a high position plays a role of a gas collecting tank, which is beneficial to the discharge of the gas in the flow battery and the maintenance of the stable pressure on both sides of the stack membrane.

[0030] In an example, the first liquid phase branch includes a positive electrode liquid phase communication pipe 110 which communicates the positive electrode buffer tank 106 with the positive electrode liquid return pipe 105, and a positive electrode liquid phase communication valve 107 disposed on the positive electrode liquid phase communication pipe 110. The second liquid phase branch includes a negative electrode liquid phase communication pipe 210 which communicates the negative electrode buffer tank 206 with the negative electrode liquid return pipe 205, and a negative electrode liquid phase communication valve 207 disposed on the negative electrode liquid phase communication pipe 210.

[0031] In an example, the diameter of the positive electrode liquid phase communication pipe 110 is not too large, so as to slow down the return flow of the positive electrode electrolyte, and to make the pressure of the flow battery stable. In an implementation, the positive electrode liquid phase communication valve 107 is an electric valve, which is interlocked with the positive electrode liquid level sensor 111, and closes the positive electrode liquid phase communication valve 107 once the set liquid level is reached.

[0032] In an example, the flow battery of the present embodiment can further include a third liquid phase branch and / or a fourth liquid phase branch. The positive electrode buffer tank 106 is connected to the positive electrode storage tank 101 through the third liquid phase branch, and the electrolyte in the positive electrode buffer tank 106 is discharged through the third liquid phase branch. The negative electrode buffer tank 206 is connected to the negative electrode storage tank 206 through the fourth liquid phase branch, and the electrolyte in the negative electrode buffer tank 206 is discharged through the fourth liquid phase branch.

[0033] In an example, the third liquid phase branch includes a positive electrode liquid discharge pipe 113 which communicates the positive electrode buffer tank 106 with the positive electrode storage tank 101, and a positive electrode liquid discharge valve 112 disposed on the positive electrode liquid discharge pipe 113. The fourth liquid phase branch includes a negative electrode liquid discharge pipe 213 which communicates the negative electrode buffer tank 206 with the negative electrode storage tank 201, and a negative electrode liquid discharge valve 212 disposed on the negative electrode liquid discharge pipe 213. For example, the positive electrode liquid discharge pipe 113 is used to return the electrolyte in the positive electrode buffer tank 106 to the positive electrode storage tank 101, which has little effect on the capacity of the flow battery.

[0034] In an example, the flow battery of the present embodiment further includes a positive electrode overflow pipe 109, one end of which is connected to the positive electrode buffer tank 106, and the other end of which is connected to the positive electrode storage tank 101 or the side of the positive electrode liquid discharge pipe 113 close to the positive electrode storage tank 101. A negative electrode overflow pipe 209 can also be provided, one end of which is connected to the negative electrode buffer tank 206, and the other end of which is connected to the negative electrode storage tank 201 or the side of the negative electrode liquid discharge pipe 213 close to the negative electrode storage tank 201.

[0035] In an example, the positive electrode overflow pipe 109 is used to automatically flow the excessive electrolyte in the positive electrode buffer tank 106 into the positive electrode storage tank 101, so as to avoid excessive accumulation of electrolyte in the positive electrode buffer tank 106.

[0036] In an example, the height of the positive overflow pipe 109 is slightly higher than the height of the positive liquid level sensor 111. The height of the negative overflow pipe 209 is slightly higher than the height of the negative liquid level sensor 211.

[0037] For example, the height of the positive overflow pipe 109 is slightly higher than the set liquid level, generally 100 mm higher. In addition, the positive overflow pipe 109 is a protective measure to prevent the positive buffer tank 106 from being full, so no valve can be installed on the positive overflow pipe 109, and the positive overflow pipe 109 is always in an open state.

[0038] In an example, the first liquid phase branch is connected to the bottom of the positive buffer tank 106, and the third liquid phase branch is connected to the side of the positive buffer tank 106. The second liquid phase branch is connected to the bottom of the negative buffer tank 206, and the fourth liquid phase branch is connected to the side of the negative buffer tank 206. Through this structure, the first liquid phase branch and the third liquid phase branch can be better connected to the positive buffer tank 106, and the second liquid phase branch and the fourth liquid phase branch can be better connected to the negative buffer tank 206, avoiding the direct connection of two liquid phase branches below the positive buffer tank 106 or the negative buffer tank 206, which is not conducive to component installation.

[0039] In an example, the first gas phase branch includes a positive gas phase communication pipe 108 that communicates the positive buffer tank 106 with the upper gas space of the positive storage tank 101. The second gas phase branch includes a negative gas phase communication pipe 208 that communicates the negative buffer tank 206 with the upper gas space of the negative storage tank 201. No valve is installed on the positive gas phase communication pipe 108 and the negative gas phase communication pipe 208, and they are always in an open state.

[0040] Reference Figure 2As shown, after the start of the flow battery shutdown procedure, the first liquid phase branch and the second liquid phase branch are in a pass-through state. For example, the positive liquid phase communication valve 107 is opened, the positive electrode of the stack 300 and the positive liquid pipeline are in liquid phase communication with the positive buffer tank 106, the positive electrolyte enters the positive buffer tank 106, and after reaching the set liquid level, the positive pump 102 stops working, and the entire positive electrode of the stack 300 and the positive liquid pipeline are in a positive pressure state. Under the action of the liquid level difference, the electrolyte in the positive buffer tank 106, the positive electrode of the stack 300 and the positive liquid pipeline gradually flows back to the positive storage tank 101. The gas in the positive storage tank 101 enters the positive buffer tank 106 through the positive gas phase communication pipe 108. Of course, it can also enter the positive buffer tank 106 through the positive overflow pipe 109. The negative side is the same principle. After the positive and negative electrolytes of the entire flow battery are respectively backflowed to the positive storage tank 101 and the negative storage tank 201, the flow battery shutdown is completed. As can be seen, the positive buffer tank 106 and the negative buffer tank 206 are arranged above the stack 300, and when receiving the shutdown instruction, the positive liquid phase communication pipe 110 and the negative liquid phase communication pipe 210 are opened, and the positive and negative electrolytes enter the positive buffer tank 106 and the negative buffer tank 206 respectively. When the positive and negative electrolytes reach the set liquid level, the positive pump 102 and the negative pump 202 stop working. Under the action of the liquid level difference between the positive buffer tank 106 and the positive storage tank 101, and under the action of the liquid level difference between the negative buffer tank 206 and the negative storage tank 201, the stack 300 and the liquid pipeline are under positive pressure.

[0041] Reference Figure 3 As shown, taking the positive side as an example, after the start of the flow battery startup procedure, the gas in the positive side of the flow battery is preferentially discharged into the positive storage tank 101 through the positive buffer tank 106 and the positive gas phase communication pipe 108, the positive side of the stack 300 and the positive liquid pipeline are under positive pressure, the positive electrolyte in the flow battery enters the positive buffer tank 106 through the positive liquid phase communication pipe 110, and after the positive electrolyte reaches the set liquid level, the positive liquid level sensor 111 sends a signal to close the positive liquid phase communication valve 107. The positive liquid valve 112 is opened, and the electrolyte in the positive buffer tank 106 flows back to the positive storage tank 101 to participate in the normal charge and discharge cycle.

[0042] The flow battery of the embodiment is not arranged in a flat layer, the positive buffer tank 106 and the related branch are arranged on the positive side, the negative buffer tank 206 and the related branch are arranged on the negative side, and during the shutdown process of the flow battery, negative pressure is avoided, and the instantaneous impact force generated by the shutdown of the circulating pump is relieved; during the startup process of the flow battery, the gas in the flow battery is discharged, negative pressure is prevented, and the stable operation of the flow battery system is facilitated.

[0043] Having described the basic concepts, it is obvious to those skilled in the art that the above-described application is merely an example and does not limit the present application. Although not explicitly described, those skilled in the art can make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, and thus still belong to the spirit and scope of the exemplary embodiments of the present application.

[0044] Meanwhile, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned in different places in the specification does not necessarily mean the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0045] Although the present application has been described with reference to the current specific embodiments, it will be appreciated by those skilled in the art that the above-described embodiments are merely illustrative of the present application, and various equivalent changes or replacements can be made without departing from the spirit of the present application, and thus, any changes, modifications to the above-described embodiments within the scope of the spirit of the present application will fall within the scope of the claims of the present application.

Claims

1. A non-planar flow battery arrangement, characterized by, Comprise: The positive tank, positive pump, positive liquid supply pipe, stack, positive return pipe are sequentially communicated; provided with positive buffer tank, the positive buffer tank is communicated to the positive return pipe through the first liquid phase branch, is communicated to the upper gas space of the positive tank through the first gas phase branch; The positive buffer tank is provided with a positive liquid level sensor; Wherein the height of the positive buffer tank is greater than the height of the stack, the height of the stack is greater than the height of the positive tank; The negative tank, negative pump, negative liquid supply pipe, stack, negative return pipe are sequentially communicated; provided with negative buffer tank, the negative buffer tank is communicated to the negative return pipe through the second liquid phase branch, is communicated to the upper gas space of the negative tank through the second gas phase branch; The negative buffer tank is provided with a negative liquid level sensor; Wherein the height of the negative buffer tank is greater than the height of the stack, the height of the stack is greater than the height of the negative tank.

2. The non-flat arrangement liquid flow battery of claim 1, wherein, The first liquid phase branch comprises: a positive liquid phase communication pipe communicating the positive buffer tank and the positive return pipe, and a positive liquid phase communication valve provided on the positive liquid phase communication pipe; And / or The second liquid phase branch comprises: a negative liquid phase communication pipe communicating the negative buffer tank and the negative return pipe, and a negative liquid phase communication valve provided on the negative liquid phase communication pipe.

3. The non-planar flow battery arrangement of claim 1, wherein, Further comprise: The third liquid phase branch, the positive buffer tank is communicated to the positive tank through the third liquid phase branch; And / or The fourth liquid phase branch, the negative buffer tank is communicated to the negative tank through the fourth liquid phase branch.

4. The non-flat arrangement liquid flow battery of claim 3, wherein, The third liquid phase branch comprises: a positive liquid discharge pipe communicating the positive buffer tank and the positive tank, and a positive liquid discharge valve provided on the positive liquid discharge pipe; And / or The fourth liquid phase branch comprises: a negative liquid discharge pipe communicating the negative buffer tank and the negative tank, and a negative liquid discharge valve provided on the negative liquid discharge pipe.

5. The non-planar flow battery arrangement of claim 4, wherein, Further comprise: The positive overflow pipe, one end of the positive overflow pipe is communicated to the positive buffer tank, the other end is communicated to the positive tank or the side of the positive liquid discharge pipe close to the positive tank; And / or The negative overflow pipe, one end of the negative overflow pipe is communicated to the negative buffer tank, the other end is communicated to the negative tank or the side of the negative liquid discharge pipe close to the negative tank.

6. The non-planar flow battery arrangement of claim 5, wherein, The height of the positive overflow pipe is slightly higher than the height of the positive liquid level sensor; And / or the height of the negative overflow pipe is slightly higher than the height of the negative liquid level sensor.

7. The non-flat arrangement liquid flow battery of claim 3, wherein, The first liquid phase branch is communicated to the bottom of the positive buffer tank, and the third liquid phase branch is communicated to the side of the positive buffer tank; And / or The second liquid phase branch is communicated to the bottom of the negative buffer tank, and the fourth liquid phase branch is communicated to the side of the negative buffer tank.

8. The non-flat arrangement liquid flow battery of claim 1, wherein, The first gas phase branch includes: a positive electrode gas phase communication pipe that communicates the positive electrode buffer tank with an upper gas space of the positive electrode storage tank; and / or The second gas phase branch includes: a negative electrode gas phase communication pipe that communicates the negative electrode buffer tank with an upper gas space of the negative electrode storage tank.

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