WO2024031923A1

WO2024031923A1 - Vanadium flow battery using different-layer arrangement

Info

Publication number: WO2024031923A1
Application number: PCT/CN2022/143493
Authority: WO
Inventors: 王鑫; 南逸; 林柏生; 姜宏东
Original assignee: 寰泰储能科技股份有限公司
Priority date: 2022-08-10
Filing date: 2022-12-29
Publication date: 2024-02-15
Also published as: CN217822889U

Abstract

Provided in the present invention is a vanadium flow battery using different-layer arrangement. The battery comprises a power unit, an electrolyte storage tank and a liquid pipeline, wherein an anode side and a cathode side of the power unit are separately provided with an electrolyte loop; the electrolyte storage tank comprises an anode electrolyte storage tank and a cathode electrolyte storage tank; and a gas phase balance pipe is connected between a gas space of the anode electrolyte storage tank and a gas space of the cathode electrolyte storage tank. The battery further comprises a negative-pressure protection channel, which makes the gas spaces of the electrolyte storage tank be in communication with the liquid pipeline. In the present invention, after a pump stops working, the negative-pressure protection channel can suck in gas from the gas spaces of the electrolyte storage tank, such that electrolyte in the liquid pipeline can smoothly fall back to the electrolyte storage tank, and the power unit being damaged by a negative pressure occurring in the power unit due to the difference between the heights of the power unit and the electrolyte storage tank is avoided, thereby improving the safety of the vanadium flow battery.

Description

All-vanadium redox flow battery with non-flat layer arrangement

Technical field

The present invention mainly relates to the technical field of flow battery safety protection, and in particular to an all-vanadium flow battery with a non-flat layer arrangement.

Background technique

With the continuous depletion of fossil energy worldwide and the increasing awareness of environmental protection among people, renewable energy power generation technology is becoming more and more popular. Renewable energy mainly includes wind energy, solar energy, biomass energy and ocean energy, etc., which are usually converted into electricity for use. However, these renewable energy power generation are obviously discontinuous and unstable due to the influence of regional, meteorological and other conditions. In order to smooth and stabilize the power generation output of renewable energy, solve the time difference between power generation and electricity consumption, and improve power quality and grid reliability, it is necessary to develop efficient energy storage technology.

All-vanadium flow battery (VFB) is a high-efficiency energy storage battery. It is a redox battery with vanadium as the active material in a circulating liquid state. It has system capacity and power that are independently adjustable, fast response, safe, reliable, and environmentally friendly. , long cycle life, easy maintenance and renewable and other outstanding advantages. All-vanadium flow batteries have become one of the most promising technologies for large-scale energy storage in renewable energy power generation, grid peak-shaving and valley-filling, and emergency and backup power stations.

In order to save occupied area, all-vanadium redox flow batteries often adopt non-flat layer layout, that is, when the power unit (stack) and capacity unit (electrolyte storage tank) are installed, they are not in a flat layer space, and the power unit is set in In the upper space, the capacity unit is set in the lower space, and there is a height difference between the power unit and the capacity unit. In an all-vanadium redox flow battery with a non-flat layer arrangement, since the first end (low end) of the supply pipeline and the discharge pipeline to the electrolyte storage tank is arranged below the liquid level of the electrolyte storage tank, the all-vanadium flow battery is After the flow battery is shut down, the height difference will prevent the electrolyte in the power unit from flowing back into the electrolyte storage tank. Negative pressure will be generated inside the all-vanadium flow battery, which may damage the diaphragm in the stack, thereby damaging the power unit battery. heap.

Contents of the invention

The technical problem to be solved by the present invention is to provide an all-vanadium redox flow battery with a non-flat layer arrangement, which can avoid the negative pressure of the all-vanadium redox flow battery caused by the height difference caused by the non-flat layer arrangement of the power unit and the electrolyte storage tank, and thereby It may damage the power unit stack and improve the safety of all-vanadium redox flow batteries.

The non-flat layer all-vanadium flow battery provided by the invention includes a power unit, an electrolyte storage tank and a liquid pipeline; there are electrolyte circuits on the positive and negative electrode sides of the power unit respectively; the electrolyte storage tank includes The positive electrolyte storage tank and the negative electrolyte storage tank have a gas phase balance tube connected between the gas space of the positive electrolyte storage tank and the gas space of the negative electrolyte storage tank; the battery also includes a negative pressure protection channel , the negative pressure protection channel connects the gas space of the electrolyte storage tank and the liquid pipeline.

Optionally, the negative pressure protection channel includes a negative pressure protection tube, a first end of the negative pressure protection tube is placed in the gas space of the electrolyte storage tank, and a second end of the negative pressure protection tube is connected to The liquid pipeline.

Optionally, the first end of the negative pressure protection tube is placed in the gas space of the positive electrolyte storage tank and/or the gas space of the negative electrolyte storage tank.

Optionally, the liquid pipeline includes a first liquid inlet pipeline, a first liquid return pipeline, a second liquid inlet pipeline and a second liquid return pipeline; the first liquid inlet pipeline and the first liquid return pipeline are located at On the positive side of the power unit, the second liquid inlet pipe and the second liquid return pipe are on the negative side of the power unit; the second end of the negative pressure protection tube is connected to the first liquid inlet pipe and the second liquid return pipe. the first liquid return pipe, the second liquid inlet pipe and/or the second liquid return pipe.

Optionally, the battery further includes a one-way valve disposed on the negative pressure protection pipe. The one-way valve allows the gas in the gas space of the electrolyte storage tank to flow only one way to the liquid pipeline. flow.

Optionally, the second end of the negative pressure protection tube is connected to a pipe section of the liquid pipeline located in the gas space of the electrolyte storage tank.

Optionally, the negative pressure protection tube is a short tube placed entirely within the gas space of the electrolyte storage tank.

Optionally, the battery has at least one negative pressure protection tube.

Optionally, the second end of the negative pressure protection tube is connected to one or more locations of the liquid pipeline.

Optionally, the negative pressure protection channel includes an opening, which is provided on a pipe section of the liquid pipeline located in the gas space of the electrolyte storage tank.

Compared with the prior art, the present invention has the following advantages: a negative pressure protection channel is provided, and the negative pressure protection channel connects the gas space and the liquid pipeline of the electrolyte storage tank. When the all-vanadium redox flow battery stops working, the negative pressure protection channel automatically inhales gas from the gas space of the electrolyte storage tank, so that there is positive air pressure in the liquid pipeline, driving the electrolyte in the liquid pipeline to smoothly fall back to the electrolyte storage tank to avoid Negative pressure in the power unit may occur due to the height difference, which may damage the power unit stack, thus improving the safety of the all-vanadium flow battery.

Figure overview

The features and performance of the present invention are further described in the following examples and accompanying drawings.

Figure 1 is a schematic structural diagram of an existing all-vanadium redox flow battery with non-flat layer arrangement;

Figure 2 is a schematic structural diagram of an all-vanadium redox flow battery in a non-flat layer arrangement according to one embodiment of the present invention;

Figure 3 is a schematic structural diagram of an all-vanadium redox flow battery in a non-flat layer arrangement according to another embodiment of the present invention;

Figure 4 is a schematic structural diagram of an all-vanadium redox flow battery in a non-flat layer arrangement according to another embodiment of the present invention;

Figure 5 is a schematic structural diagram of an all-vanadium redox flow battery in a non-flat layer arrangement according to another embodiment of the present invention;

Figure 6 is an enlarged schematic diagram of the structure at A in Figure 5;

Figure 7 is a schematic structural diagram of an all-vanadium flow battery in a non-flat layer arrangement according to another embodiment of the present invention.

In the attached picture:

110-power unit;

120-electrolyte storage tank; 121-positive electrolyte storage tank; 122-negative electrolyte storage tank;

130-liquid pipe; 131-first liquid inlet pipe; 132-first liquid return pipe; 133-second liquid inlet pipe; 134-second liquid return pipe;

140-pump; 141-first pump; 142-second pump;

150-Gas phase balance tube;

160-negative pressure protection tube; 161-one-way valve; 162-short tube; 163-opening.

Preferred embodiments of the invention

Figure 1 is a schematic structural diagram of an existing all-vanadium redox flow battery with a non-flat layer arrangement. Referring to FIG. 1 , this battery includes a power unit 110 , an electrolyte storage tank 120 , a liquid pipeline 130 and a pump 140 . The electrolyte storage tank 120 includes a positive electrolyte storage tank 121 and a negative electrolyte storage tank 122. The gas space in the positive electrolyte storage tank 121 (space above the liquid level) and the gas space in the negative electrolyte storage tank 122 are A gas phase balance pipe 150 is connected between them. The liquid pipe 130 includes a first liquid inlet pipe 131 , a first liquid return pipe 132 , a second liquid inlet pipe 133 and a second liquid return pipe 134 . The pump 140 includes a first pump 141 and a second pump 142 .

On the cathode side of the power unit 110, the cathode electrolyte storage tank 121, the first liquid inlet pipe 131, the power unit 110 and the first liquid return pipe 132 form a liquid circuit (eg, electrolyte circuit). Among them, the first pump 141 is provided on the first liquid inlet pipe 131 . On the negative electrode side of the power unit 110, the negative electrolyte storage tank 122, the second liquid inlet pipe 133, the power unit 110 and the second liquid return pipe 134 form a liquid circuit (eg, electrolyte circuit). Wherein, the second pump 142 is provided on the second liquid inlet pipe 133 .

It can be seen from Figure 1 that in an all-vanadium redox flow battery arranged in a non-flat layer, after the all-vanadium redox flow battery is shut down (the pump 140 also stops working), the power unit 110 arranged at a high place will be affected by the negative pressure caused by the height difference. Damage may damage the diaphragm in the stack.

Embodiment 1

Figure 2 is a schematic structural diagram of an all-vanadium redox flow battery in a non-flat layer arrangement according to an embodiment of the present invention. Referring to Figure 2, its structure includes a power unit 110, an electrolyte storage tank 120, a liquid pipeline 130 and a pump 140. The power unit 110 has an electrolyte circuit on the positive electrode side and the negative electrode side respectively. That is, on the cathode side of the power unit 110, the cathode electrolyte storage tank 121, the first liquid inlet pipe 131, the power unit 110 and the first liquid return pipe 132 form a liquid circuit (eg, electrolyte circuit). Among them, the first pump 141 is provided on the first liquid inlet pipe 131 . On the negative electrode side of the power unit 110, the negative electrolyte storage tank 122, the second liquid inlet pipe 133, the power unit 110 and the second liquid return pipe 134 form a liquid circuit (eg, electrolyte circuit). Among them, the second pump 142 is provided on the second liquid inlet pipe 133 .

The electrolyte storage tank 120 includes a positive electrolyte storage tank 121 and a negative electrolyte storage tank 122. A gas phase balance pipe 150 is connected between the gas space in the positive electrolyte storage tank 121 and the gas space in the negative electrolyte storage tank 122. The battery also includes a negative pressure protection channel, which connects the gas space of the electrolyte storage tank 120 and the liquid pipeline 130 .

In this embodiment, the negative pressure protection channel includes a negative pressure protection tube 160. The first end of the negative pressure protection tube 160 is placed in the gas space in the electrolyte storage tank 120, and the second end of the negative pressure protection tube 160 is connected to the liquid. Pipe 130. When the all-vanadium flow battery stops working, due to the height difference between the power unit 110 and the electrolyte storage tank 120, a negative pressure will be generated in the liquid pipeline 130 and the power unit 110. Due to the negative pressure protection channel, such as In this embodiment, a negative pressure protection tube 160 is provided, with its first end placed in the gas space of the electrolyte storage tank 120 and its second end connected to the liquid pipeline 130. When the liquid pipeline 130 and the power unit 110 generate negative pressure, The first end of the negative pressure protection tube 160 inhales gas from the electrolyte storage tank 120 and transports it to the liquid pipeline 130, thereby balancing or offsetting the negative pressure caused by the drop of the electrolyte, and maintaining the pressure stability of the power unit 110 , reducing damage to the power unit 110 (power unit stack).

In one possible implementation, the first end of the negative pressure protection tube 160 is placed in the gas space of the positive electrolyte storage tank 121 (as shown in FIG. 2 ) and/or the gas space of the negative electrolyte storage tank 122 . In this embodiment, since the gas phase balance pipe 150 is connected between the gas space of the positive electrolyte storage tank 121 and the gas space of the negative electrolyte storage tank 122, the gas space of the positive electrolyte storage tank 121 and the negative electrode are maintained at all times. The gas space of the electrolyte storage tank 122 is connected. Therefore, the first end of the negative pressure protection tube 160 can be placed in the gas space of the positive electrolyte storage tank 121, or can be placed in the gas space of the negative electrolyte storage tank 122, or can be placed in the gas space of the positive electrolyte storage tank 121 at the same time. The gas space and the gas space of the negative electrolyte storage tank 122 . All three methods can achieve the purpose of inhaling gas after the all-vanadium flow battery stops working. Of course, it can be understood that when the first end of the negative pressure protection tube 160 is placed into the gas space of the positive electrolyte storage tank 121 and the gas space of the negative electrolyte storage tank 122 at the same time, the first end of the negative pressure protection tube 160 There should be at least two branch ports to achieve the above purpose.

In a possible implementation, the second end of the negative pressure protection tube 160 is connected to the first liquid inlet pipe 131 , the first liquid return pipe 132 , the second liquid inlet pipe 133 and/or the second liquid return pipe 134 . Based on the same principle as mentioned above, since the gas phase balance pipe 150 is connected between the gas space of the positive electrolyte storage tank 121 and the gas space of the negative electrolyte storage tank 122, the gas space of the positive electrolyte storage tank 121 and the negative electrode are maintained at all times. The gas spaces of the electrolyte storage tank 122 are connected. Therefore, connecting the second end of the negative pressure protection pipe 160 to one or more of the four liquid pipes 130 can achieve the purpose of injecting air into the liquid pipe 130 . Illustratively, the second end of the negative pressure protection pipe 160 may be connected to the first liquid return pipe 132, or the second end of the negative pressure protection pipe 160 may be connected to the first liquid inlet pipe 131 and the first liquid return pipe 132. The two pipes, or the second end of the negative pressure protection pipe 160, can be connected to the first liquid inlet pipe 131 and the second liquid inlet pipe 133, etc. Those skilled in the art should be able to understand other connection combinations. I won’t go into details here.

The non-flat-layer all-vanadium redox flow battery provided by this embodiment is provided with a negative pressure protection channel. The negative pressure protection channel includes a negative pressure protection tube 160. After the all-vanadium redox flow battery stops working, the negative pressure protection tube 160 One end sucks gas to offset the negative pressure in the liquid pipe 130 and the power unit 110, thereby reducing damage to the power unit 110 (power unit stack) and improving the safety of the all-vanadium flow battery.

Embodiment 2

Figure 3 is a schematic structural diagram of an all-vanadium redox flow battery in a non-flat layer arrangement according to another embodiment of the present invention. Referring to Figure 3, its structure includes a power unit 110, an electrolyte storage tank 120, a liquid pipeline 130 and a pump 140. There are electrolyte circuits on the positive and negative sides of the power unit 110 respectively. For details of the electrolyte circuit, please refer to the description in Figure 1.

The battery of this embodiment also includes a negative pressure protection channel, which connects the gas space of the electrolyte storage tank 120 and the liquid pipeline 130 . The negative pressure protection channel includes a negative pressure protection tube 160 . The first end of the negative pressure protection tube 160 is placed in the gas space in the electrolyte storage tank 120 . The second end of the negative pressure protection tube 160 is connected to the liquid pipeline 130 .

In this embodiment, the battery further includes a one-way valve 161 disposed on the negative pressure protection pipe 160 . The one-way valve 161 allows the gas in the gas space of the electrolyte storage tank 120 to flow only in one direction to the liquid pipe 130 . In the absence of the one-way valve 161, when the all-vanadium flow battery is operating, the electrolyte in the liquid pipe 160 circulates. A negative pressure protection pipe 160 is connected to the liquid pipe 160, and some liquid (electrolyte) will flow in. in the negative pressure protection tube 160. In order to ensure the effectiveness of the negative pressure protection tube 160, a one-way valve 161 is provided in this example. When the all-vanadium redox flow battery is operating, the presence of the one-way valve 161 prevents the liquid from flowing to the negative pressure protection tube 160. After the all-vanadium redox flow battery stops working, the gas in the electrolyte storage tank 120 can still pass through the negative pressure protection tube 160 smoothly. Illustratively, other devices with the same or similar functions as the one-way valve 161 can also be used, such as a breathing valve, to ensure that the negative pressure protection tube 160 will not be filled with electrolyte during normal operation of the all-vanadium redox flow battery, affecting the its performance or failure.

The non-flat-layer all-vanadium redox flow battery provided by this embodiment is provided with a negative pressure protection channel. The negative pressure protection channel includes a negative pressure protection tube 160 and is also provided with a one-way valve 161. During the operation of the all-vanadium redox flow battery, , to prevent the electrolyte from flowing into the negative pressure protection tube 160. After the all-vanadium redox flow battery stops working, the first end of the negative pressure protection tube 160 inhales gas to offset the negative pressure in the liquid pipeline 130 and the power unit 110, reducing This prevents damage to the power unit 110 (power unit stack) and improves the safety of the all-vanadium flow battery.

Embodiment 3

Figure 4 is a schematic structural diagram of an all-vanadium redox flow battery in a non-flat layer arrangement according to another embodiment of the present invention. Referring to Figure 4, its structure includes a power unit 110, an electrolyte storage tank 120, a liquid pipeline 130 and a pump 140. The power unit 110 has an electrolyte circuit on the positive side and the negative side respectively. For details of the electrolyte circuit, please refer to the description in Figure 1.

The all-vanadium redox flow battery is provided with a negative pressure protection channel. The negative pressure protection channel includes a negative pressure protection tube 160. The first end of the negative pressure protection tube 160 is placed in the gas space of the electrolyte storage tank 120. The negative pressure protection tube 160 has a third end. The two ends are connected to the pipe section of the liquid pipe 130 located in the gas space of the electrolyte storage tank 120, so that the second end of the negative pressure protection pipe 160 is located in the gas space of the electrolyte storage tank 120. In this embodiment, not only the first end of the negative pressure protection tube 160 can be placed in the gas space of the electrolyte storage tank 120, but the second end of the negative pressure protection tube 160 can also be placed in the gas space of the electrolyte storage tank 120. inside, thereby preventing air leakage in the negative pressure protection tube 160 or inhalation of atmospheric air from outside the electrolyte storage tank 120 to ensure gas balance within the entire all-vanadium redox flow battery.

In one possible implementation, the negative pressure protection tube 160 is a short tube 162 that is entirely placed in the gas space of the electrolyte storage tank 120 . That is, the negative pressure protection tube 160 can be directly simplified into a short tube 162 . When the short tube 162 is used, in this embodiment, not only the two ends of the original negative pressure protection tube 160 are placed in the gas space of the electrolyte storage tank 120, but the entire short tube 162 is placed in the gas space of the electrolyte storage tank 120. , completely eliminating the possibility of the electrolyte storage tank 120 inhaling the atmosphere from the outside, effectively ensuring the gas balance within the entire all-vanadium redox flow battery.

The non-flat-layer all-vanadium flow battery provided by this embodiment can make both ends of the negative pressure protection tube 160 located in the gas space of the electrolyte storage tank 120, or directly use the short tube 162 connected to the liquid pipe 130, It is possible to inhale gas in the electrolyte storage tank 120 to offset the negative pressure in the liquid pipeline 130 and the power unit 110. At the same time, it can prevent the negative pressure protection pipe 160 from leaking or inhaling the atmosphere from outside the electrolyte storage tank 120, reducing Damage to the power unit 110 (power unit stack) improves the safety of the all-vanadium flow battery.

Embodiment 4

Figure 5 is a schematic structural diagram of an all-vanadium flow battery with a non-flat layer arrangement according to another embodiment of the present invention. Figure 6 is an enlarged schematic diagram of the structure at point A in Figure 5 .

Referring to Figure 5, the all-vanadium flow battery structure includes a power unit 110, an electrolyte storage tank 120, a liquid pipeline 130 and a pump 140. The power unit 110 has electrolyte circuits on the positive and negative sides respectively. For details of the electrolyte circuit, please refer to the description in Figure 1.

In this embodiment, the all-vanadium flow battery also includes a negative pressure protection channel, which connects the gas space of the electrolyte storage tank 120 and the liquid pipeline 130 . Referring to FIGS. 5 and 6 , the negative pressure protection channel includes an opening 163 , which is provided on a pipe section of the liquid pipeline 130 located in the gas space of the electrolyte storage tank 120 . After the all-vanadium flow battery stops working, the electrolyte flows due to gravity. The method of opening 163 will be interfered by the electrolyte to a certain extent, but it can also basically offset the negative pressure in the liquid pipeline 130 and the power unit 110 , the biggest advantage of this method is that it can minimize other components, which undoubtedly has a cost advantage. Of course, the size and number of the openings 163 can be determined according to the actual situation, and are not specifically limited here.

The non-flat-layer all-vanadium flow battery provided by this embodiment is provided with a negative pressure protection channel. The negative pressure protection channel includes an opening 163 to allow gas to be inhaled in the electrolyte storage tank 120 to offset the liquid pipeline 130 and power. The negative pressure within the unit 110 reduces damage to the power unit 110 (power unit stack) and improves the safety of the all-vanadium flow battery. In addition, the negative pressure protection method of opening 163 is adopted to reduce equipment costs.

Embodiment 5

Figure 7 is a schematic structural diagram of an all-vanadium flow battery in a non-flat layer arrangement according to another embodiment of the present invention. Referring to Figure 7, its structure includes a power unit 110, an electrolyte storage tank 120, a liquid pipeline 130 and a pump 140. The power unit 110 has an electrolyte circuit on the positive side and the negative side respectively. For details of the electrolyte circuit, please refer to the description in Figure 1.

The all-vanadium redox flow battery is provided with a negative pressure protection channel. The negative pressure protection channel includes a negative pressure protection tube 160. The first end of the negative pressure protection tube 160 is placed in the gas space of the electrolyte storage tank 120. The negative pressure protection tube 160 has a third end. The two ends are connected to the liquid pipe 130 and the second end of the negative pressure protection pipe 160 is located in the gas space of the electrolyte storage tank 120 . Under the requirements of meeting the actual situation and improving the efficiency of negative pressure protection, the all-vanadium redox flow battery can be equipped with at least one negative pressure protection tube 160 . Illustratively, a negative voltage protection tube 160 can be provided on the positive electrode side of the power unit 110, or a negative voltage protection tube 160 can be provided on the positive electrode side and the negative electrode side of the power unit 110 respectively. For example, in Figure 7, a negative pressure protection tube 162 in the form of a short tube is provided on one side of the positive electrolyte storage tank 121, and a negative pressure protection pipe 160 is provided on one side of the negative electrolyte storage tank 122, using a variety of negative pressure Protection method to improve the use effect. In Figure 7, the short tube 162 (ie, the specialized negative pressure protection tube 160) is arranged on the first liquid inlet pipe 131, and the second end of the negative pressure protection pipe 160 is arranged on the second liquid return pipe 134. It can be seen that , the second end of the negative pressure protection tube 160 can be connected to the liquid inlet pipe or the liquid return pipe, so that the same negative pressure protection purpose can be achieved.

In a possible implementation, the second end of the negative pressure protection tube 160 is connected to one or more locations of the liquid pipeline 130 . It can be understood that, in the case where the second end of the negative pressure protection tube 160 is connected to multiple locations of the liquid pipeline 130, the second end of the negative pressure protection tube 160 should have multiple branch ports, and at the same time, the liquid pipeline 130 has multiple branch ports. corresponding connection port.

In a possible implementation, the negative pressure protection tube 160 may be a hard pipe or a soft pipe. The material selection of the negative pressure protection tube 160 may depend on the actual situation, and is not specifically limited in the present invention.

The non-flat-layer all-vanadium redox flow battery provided by this embodiment is provided with a negative pressure protection channel and a negative pressure protection tube 160. After the all-vanadium redox flow battery stops working, the first part of the negative pressure protection tube 160 The gas is sucked in at the end to offset the negative pressure in the liquid pipeline 130 and the power unit 110, and different forms and numbers of negative pressure protection channels can be set according to actual needs, reducing damage to the power unit 110 (power unit stack). , improving the safety of all-vanadium redox flow batteries.

Claims

An all-vanadium flow battery with non-flat layer arrangement, the battery includes:

Power unit (110), electrolyte storage tank (120) and liquid pipeline (130); there are electrolyte circuits on the positive and negative sides of the power unit (110) respectively;

The electrolyte storage tank (120) includes a positive electrolyte storage tank (121) and a negative electrolyte storage tank (122). The gas space of the positive electrolyte storage tank (121) and the negative electrolyte storage tank (121) are A gas phase balance pipe (150) is connected between the gas spaces of 122); it is characterized in that,

The battery also includes a negative pressure protection channel, which connects the gas space of the electrolyte storage tank (120) and the liquid pipeline (130).
The all-vanadium flow battery with non-flat layer arrangement according to claim 1, wherein the negative pressure protection channel includes a negative pressure protection tube (160), and the first end of the negative pressure protection tube (160) is In the gas space of the electrolyte storage tank (120), the second end of the negative pressure protection pipe (160) is connected to the liquid pipe (130).
The all-vanadium flow battery with non-flat layer arrangement according to claim 2, characterized in that the first end of the negative pressure protection tube (160) is placed in the gas space and the positive electrolyte storage tank (121). /or the gas space of the negative electrolyte storage tank (122).
The non-flat layer all-vanadium flow battery as claimed in claim 2 or 3, characterized in that:

The liquid pipe (130) includes a first liquid inlet pipe (131), a first liquid return pipe (132), a second liquid inlet pipe (133) and a second liquid return pipe (134); the first liquid inlet pipe (134) Pipe (131) and the first liquid return pipe (132) are on the positive side of the power unit (110), and the second liquid inlet pipe (133) and the second liquid return pipe (134) are on the positive side of the power unit (110). The negative side of the power unit (110);

The second end of the negative pressure protection pipe (160) is connected to the first liquid inlet pipe (131), the first liquid return pipe (132), the second liquid inlet pipe (133) and/or The second liquid return pipe (134).
The all-vanadium flow battery with non-flat layer arrangement according to claim 2, characterized in that the battery further includes a one-way valve (161) provided on the negative pressure protection tube (160), and the one-way valve (161) is disposed on the negative pressure protection tube (160). The valve (161) allows the gas in the gas space of the electrolyte storage tank (120) to flow only in one direction to the liquid pipeline (130).
The all-vanadium flow battery with non-flat layer arrangement according to claim 2, characterized in that the second end of the negative pressure protection tube (160) is connected to the liquid pipe (130) and is located in the electrolyte storage tank. (120) A pipe segment within the gas space.
The all-vanadium flow battery with non-flat layer arrangement according to claim 6, characterized in that the negative pressure protection tube (160) is a short tube integrally placed in the gas space of the electrolyte storage tank (120). (162).
The all-vanadium flow battery with non-flat layer arrangement according to claim 2, characterized in that the battery has at least one negative pressure protection tube (160).
The all-vanadium flow battery with non-flat layer arrangement according to claim 2, characterized in that the second end of the negative pressure protection tube (160) is connected to one or more places of the liquid pipe (130).
The all-vanadium flow battery with non-flat layer arrangement according to claim 1, characterized in that the negative pressure protection channel includes an opening (163), and the opening (163) is provided in the liquid pipe (130) Located on the pipe section in the gas space of the electrolyte storage tank (120).