Ventilation recovery system for electrolyte storage tank and flow battery

Abstract

The utility model relates to a ventilation recovery system for an electrolyte storage tank and a flow battery, the ventilation recovery system for the electrolyte storage tank comprises an alkali washing tank, a gas inlet pipe and a gas supply pipe, the alkali washing tank is provided with an alkali washing cavity, and the alkali washing cavity can contain an alkali washing solution; one end of the air inlet pipe is connected to the alkali washing tank and communicated with the alkali washing cavity, and the other end is communicated with a compressed air source; and one end of the gas supply pipe is connected to the alkali washing tank and communicates with the alkali washing cavity, and the other end of the gas supply pipe is used for being connected with an electrolyte storage tank so as to convey alkali-washed gas to the electrolyte storage tank. The problem of battery capacity attenuation can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of liquid flow batteries, and in particular to a ventilation recovery system for an electrolyte storage tank and a liquid flow battery. Background Art

[0002] Alkaline iron-based flow batteries are actually redox batteries. During the discharge process, the active substances in the positive electrode electrolyte transfer from an oxidized state to a reduced state, and the active substances in the negative electrode electrolyte transfer from a reduced state to an oxidized state. However, due to the presence of trace parasitic reactions, the reduced active substances at the negative electrode gradually accumulate, making it difficult to maintain an accurate match between the amount of active substances in the battery between the positive and negative electrodes, which ultimately causes the battery capacity to decay. The existing method of restoring battery capacity is to add an oxidant. Oxygen in the air is a good oxidant, but there are other impurity gases in the air that are not allowed to enter the electrolyte. Therefore, there is an urgent need for a capacity recovery technology that can quickly and conveniently obtain oxygen, and is reliable and low-cost. Summary of the invention

[0003] Based on this, it is necessary to provide a ventilation recovery system for an electrolyte storage tank and a liquid flow battery to address the problem of battery capacity attenuation.

[0004] According to one aspect of the present application, a ventilation recovery system for an electrolyte storage tank is provided, comprising: an alkali washing tank, provided with an alkali washing chamber, and the alkali washing chamber can accommodate alkali washing liquid; an air inlet pipe, one end of which is connected to the alkali washing tank and communicated with the alkali washing chamber, and the other end is used to communicate with a compressed air source; and an air supply pipe, one end of which is connected to the alkali washing tank and communicated with the alkali washing chamber, and the other end is used to connect to the electrolyte storage tank to transport the gas after alkali washing to the electrolyte storage tank.

[0005] In some embodiments, a main flow pipe and a plurality of branch pipes are provided in the alkaline washing chamber; one end of the main flow pipe is sealed and connected to the air inlet pipe, and the other end is closed, and the main flow pipe extends along a first direction; a plurality of branch pipes are connected to the main flow pipe, the branch pipes extend longitudinally along a second direction, and a plurality of branch pipes are arranged at intervals along the first direction; wherein each of the branch pipes is provided with a plurality of branch holes arranged at intervals along the second direction, and the branch holes pass through the tube wall of the branch pipe; the first direction intersects with the second direction.

[0006] In some embodiments, the alkaline washing chamber includes a reaction chamber having a top wall and a bottom wall arranged opposite to each other, and a side wall connected between the top wall and the bottom wall; the air inlet pipe is connected to the side wall, and the air supply pipe is connected to the top wall.

[0007] In some embodiments, a plurality of partition plates are provided in the reaction chamber, a plurality of air holes are provided on the partition plates, and one partition plate divides the reaction chamber into two chambers; the air inlet pipe and the air supply pipe are respectively connected to different chambers.

[0008] In some embodiments, the alkali washing chamber also includes a water seal chamber; an isolation plate is provided between the water seal chamber and the reaction chamber, one end of the isolation plate is sealed and connected to the top wall, and the other end is spaced apart from the bottom wall; the ventilation recovery system for the electrolyte storage tank also includes a return air pipe and an exhaust pipe both connected to the alkali washing tank, one end of the return air pipe is connected to the water seal chamber, and the other end is used to connect to the exhaust port of the electrolyte storage tank, one end of the exhaust pipe is connected to the water seal chamber, and the other end extends to the outside of the alkali washing chamber; wherein a one-way valve is installed on the return air pipe to prevent the liquid in the water seal chamber from being sucked back into the return air pipe.

[0009] In some embodiments, the alkali cleaning tank includes a tank body and a cover plate sealed with the tank body; a boss is provided on the cover plate, and the boss has a hollow cavity connected to the alkali cleaning chamber; the exhaust pipe is connected to the boss, and the exhaust port of the exhaust pipe is flush with the upper port of the boss.

[0010] In some embodiments, the return air pipe is provided with an adjustment component capable of adjusting the depth of its insertion into the water seal chamber; the adjustment component includes: a connecting pipe connected to the alkali cleaning tank and communicated with the alkali cleaning chamber, the connecting pipe is sleeved outside the return air pipe, and the end of the connecting pipe away from the alkali cleaning tank is provided with a first external thread; a sealing ring is sleeved outside the return air pipe, and the sealing ring is located between the outer wall of the return air pipe and the inner wall of the connecting pipe; a first adjustment pipe has a first end and a second end opposite to each other, the inner wall of the first end is provided with a first internal thread, and the outer wall of the second end is provided with a first internal thread. The wall is provided with a second external thread, and the first internal thread is adapted to the first external thread so that the inner end surface of the first regulating tube can squeeze the sealing ring downward; a fixing ring is sleeved outside the return air pipe, and the fixing ring part is located between the outer wall of the return air pipe and the inner wall of the first regulating tube; the second regulating tube, the inner wall is provided with a second internal thread adapted to the second external thread; wherein, another part of the fixing ring is located between the outer wall of the return air pipe and the inner wall of the second regulating tube; the second regulating tube can squeeze the fixing ring inward so that the fixing ring is pressed against the return air pipe.

[0011] In some embodiments, the alkali cleaning tank is provided with an injection port for adding alkali cleaning solution; the air supply pipe is sealingly connected to the injection port.

[0012] In some embodiments, the alkali cleaning tank is also provided with a drain port for discharging the alkali cleaning liquid; the drain port is connected to a drain pipe, one end of the drain pipe extends into the bottom of the alkali cleaning tank, and the other end extends out of the alkali cleaning tank, and the heights of both ends of the drain pipe are the same, or the end of the drain pipe located outside the alkali cleaning tank is lower than the end of the drain pipe located inside the alkali cleaning tank.

[0013] According to another aspect of the present application, a liquid flow battery is provided, comprising the ventilation recovery system for the electrolyte storage tank as described above.

[0014] The ventilation recovery system for the electrolyte storage tank provided in the present application, during use, connects the alkali washing tank between the compressed air source and the electrolyte storage tank through the air inlet pipe and the air supply pipe, first uses the alkali washing tank to perform alkali washing on the compressed air provided by the compressed air source to remove gases in the compressed air that are harmful to the electrolyte, such as removing carbon dioxide therein, and then the gas after alkali washing is introduced into the electrolyte storage tank.

[0015] Based on this, oxygen in the gas passed into the electrolyte storage tank can oxidize the reduced active substances accumulated in the electrolyte into oxidized states, while avoiding the negative impact of gases such as carbon dioxide on the electrolyte, thereby restoring the battery capacity and improving the performance of the flow battery.

[0016] In addition, the alkaline washing liquid in the alkaline washing tank can act as a water seal. Due to the existence of the water seal pressure, the air that has not been alkaline washed cannot enter the electrolyte storage tank, which protects the electrolyte and further improves the performance of the flow battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A stereoscopic diagram of a ventilation recovery system for an electrolyte storage tank in one embodiment of the present application is shown.

[0018] Figure 2 A front view of a ventilation recovery system for an electrolyte storage tank in one embodiment of the present application is shown.

[0019] Figure 3 A side view of a ventilation recovery system for an electrolyte storage tank in one embodiment of the present application is shown.

[0020] Figure 4 A cross-sectional view of a ventilation recovery system for an electrolyte storage tank in one embodiment of the present application is shown.

[0021] Figure 5 A schematic diagram of a main flow pipe and a branch flow pipe of a ventilation recovery system for an electrolyte storage tank in one embodiment of the present application is shown.

[0022] Figure 6A cross-sectional view from another perspective of a ventilation recovery system for an electrolyte storage tank in one embodiment of the present application is shown.

[0023] Figure 7 A schematic diagram of a cover plate of an alkali washing tank in an embodiment of the present application is shown.

[0024] Figure 8 A schematic diagram of a cover plate and an exhaust pipe in an embodiment of the present application is shown.

[0025] Fig. 9 An exploded view of an adjustment assembly in an embodiment of the present application is shown.

[0026] Fig.10 A cross-sectional view of an adjustment assembly and an air return pipe in one embodiment of the present application is shown.

[0027] Fig.11 A schematic diagram of a liquid flow battery in an embodiment of the present application is shown.

[0028] Description of Figure Numbers:

[0029] 1. Charging and discharging system; 11. Battery stack; 12. Positive electrode electrolyte storage tank; 13. Negative electrode electrolyte storage tank;

[0030] 2. Ventilation recovery system for electrolyte storage tank;

[0031] 21, alkali cleaning tank; 21a, tank body; 21b, cover plate; 21c, boss; 211, alkali cleaning chamber; 211a, reaction chamber; 211b, water seal chamber; 212, partition plate; 2121, air vent; 213, isolation plate; 214, main flow pipe; 215, diverter pipe; 2151, diverter hole; 216, liquid injection port; 217, liquid discharge pipe;

[0032] 22. Intake pipe;

[0033] 23. Air supply pipe;

[0034] 24, air return pipe; 241, one-way valve; 242, connecting pipe; 2421, first external thread; 243, sealing ring; 244, first regulating pipe; 2441, first internal thread; 2442, second external thread; 245, fixing ring; 246, second regulating pipe; 2461, second internal thread;

[0035] 25. Exhaust pipe;

[0036] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] After multiple charges and discharges of alkaline iron-based liquid flow batteries, reduced active substances in the negative electrolyte will accumulate, affecting the performance of the liquid flow battery and causing the capacity of the liquid flow battery to decay. In related technologies, air is introduced into the negative electrolyte, and the oxygen in the air is used to oxidize the reduced active substances accumulated in the strong alkaline electrolyte into an oxidized state, thereby improving the performance of the liquid flow battery.

[0044] However, the inventors of the present application have found that although introducing air into the negative electrode electrolyte can solve the problem of accumulation of reduced active substances to a certain extent, the air contains not only oxygen but also a variety of other gases, some of which are harmful to the negative electrode electrolyte. For example, carbon dioxide in the air will affect the pH value of the negative electrode electrolyte, thereby affecting the performance of the negative electrode electrolyte.

[0045] If pure oxygen is directly introduced into the negative electrode electrolyte, although in theory no other impurities will be introduced, pure oxygen is generally stored in high-pressure gas cylinders. Based on the daily charging and discharging frequency of a 5MW energy storage power station, one container of pure oxygen needs to be replenished approximately once a month. For a 100-megawatt energy storage power station, the cost is too high and the feasibility is very low.

[0046] To this end, the inventor of the present application has further studied and designed a ventilation recovery system for an electrolyte storage tank, which includes an alkali washing tank. The alkali washing tank is first used to perform alkali washing on the compressed air to remove gases harmful to the electrolyte in the compressed air, and then the alkali-washed compressed air is introduced into the electrolyte storage tank, thereby avoiding the negative impact of compressed air on the electrolyte. The reduced active substances accumulated in the electrolyte are oxidized to an oxidized state, thereby restoring the battery capacity and improving the performance of the flow battery. At the same time, the alkali washing liquid in the alkali washing tank can act as a water seal. Due to the existence of the water seal pressure, the air that has not been alkali washed cannot enter the electrolyte storage tank, which protects the electrolyte and further improves the performance of the flow battery.

[0047] See also Figure 1-Figure 4 , the ventilation recovery system 2 for electrolyte storage tank provided by one embodiment of the present application includes an alkali cleaning tank 21, an air inlet pipe 22 and an air supply pipe 23. The alkali cleaning tank 21 is provided with an alkali cleaning chamber 211, and the alkali cleaning chamber 211 can accommodate alkali cleaning liquid. One end of the air inlet pipe 22 is connected to the alkali cleaning tank 21 and communicates with the alkali cleaning chamber 211, and the other end is used to communicate with a compressed air source. One end of the air supply pipe 23 is connected to the alkali cleaning tank 21 and communicates with the alkali cleaning chamber 211, and the other end is used to connect the electrolyte storage tank to transport the gas after alkali cleaning to the electrolyte storage tank. Among them, the shape of the alkali cleaning tank 21 can be a regular shape such as a cube, a polygonal prism, a cylinder, or an irregular shape. The air inlet pipe 22 and the air supply pipe 23 can be connected to the same side or different sides of the alkali cleaning tank 21.

[0048] Based on this, the gas introduced into the electrolyte storage tank has been treated with alkali washing, in which gases harmful to the electrolyte are removed, avoiding the negative impact of gases such as carbon dioxide on the electrolyte, and the oxygen in it can oxidize the reduced active substances accumulated in the electrolyte into oxidized states, thereby restoring the battery capacity and improving the performance of the liquid flow battery. At the same time, the alkali washing liquid in the alkali washing tank can act as a water seal. Due to the existence of the water seal pressure, air that has not been alkali washed cannot enter the electrolyte storage tank, which protects the electrolyte and further improves the performance of the liquid flow battery.

[0049] See also Figure 4 and Figure 5In some embodiments, a main flow pipe 214 and a plurality of shunt pipes 215 are provided in the alkali washing chamber 211. One end of the main flow pipe 214 is sealed and connected to the air inlet pipe 22, and the other end is closed, and the main flow pipe 214 extends along the first direction X. The plurality of shunt pipes 215 are all connected to the main flow pipe 214, and the shunt pipes 215 extend longitudinally along the second direction Y intersecting the first direction X, and the plurality of shunt pipes 215 are arranged at intervals along the first direction X. Each shunt pipe 215 is provided with a plurality of shunt holes 2151 arranged at intervals along the second direction Y, and the shunt holes 2151 penetrate the tube wall of the shunt pipe 215. In this way, the contact area between the compressed air and the alkali washing solution is increased, so that the gas harmful to the electrolyte can react more fully with the alkali washing solution, thereby improving the alkali washing effect.

[0050] Exemplarily, the first direction X is perpendicular to the second direction Y, so that the plurality of diversion holes 2151 on the plurality of diversion tubes 215 can be distributed more evenly.

[0051] See also Figure 6 Optionally, the diverter pipe 215 is located at the bottom of the alkali washing chamber 211, for example, less than one-third of the height of the alkali washing chamber 211, so that the gas diverted from the diverter pipe 215 has a longer upward diffusion path, further improving the alkali washing effect.

[0052] Optionally, the inner diameter of the main pipe 214 is larger than the inner diameter of the branch pipe 215. In this way, it can be ensured that after the gas in the main pipe 214 is branched to multiple branch pipes 215, a relatively high gas pressure can still be maintained, so that the gas in the branch pipe 215 can be quickly discharged into the alkaline washing liquid, thereby improving the alkaline washing efficiency.

[0053] Optionally, the inner diameters and lengths of the plurality of diverter tubes 215 are equal, and the plurality of diverter tubes 215 are evenly spaced and arranged along the first direction X, so that the gas is dispersed more evenly.

[0054] Optionally, the plurality of diverter holes 2151 on the diverter tube 215 are evenly spaced and arranged, and the aperture of each diverter hole 2151 is equal, thereby further improving the uniformity of gas dispersion.

[0055] See also Figure 4 and Figure 6In some embodiments, the alkali washing chamber 211 includes a reaction chamber 211a, and the reaction chamber 211a has a top wall and a bottom wall that are relatively arranged, and a side wall connected between the top wall and the bottom wall. Exemplarily, the reaction chamber 211a has four side walls, and the four side walls are enclosed to form a ring, and the top wall and the bottom wall are divided into two ends that are sealed and connected to the ring structure, and are combined to form the alkali washing chamber 211. Among them, the air inlet pipe 22 is connected to the side wall, and the air supply pipe 23 is connected to the top wall. In this way, the gas first enters the alkali washing chamber 211 from the side of the alkali washing chamber 211, and after the alkali washing treatment of the alkali washing liquid in the alkali washing chamber 211, it enters the air supply pipe 23 from the top of the alkali washing chamber 211, so that the gas can fully contact with the alkali washing liquid.

[0056] Optionally, a plurality of partition plates 212 are provided in the reaction chamber 211a, a plurality of air holes 2121 are provided on the partition plate 212, and one partition plate 212 divides the reaction chamber 211a into two chambers. The air inlet pipe 22 and the air supply pipe 23 are respectively connected to different chambers. Exemplarily, two partition plates 212 are provided in the reaction chamber 211a, and the two partition plates 212 divide the reaction chamber 211a into three chambers, the air inlet pipe 22 is connected to the chamber at the bottom, and the air supply pipe 23 is connected to the chamber at the top. In this way, the gas provided by the air inlet pipe 22 to the reaction chamber 211a will be dispersed by the air holes 2121 on the partition plate 212, so that the gas in different chambers is dispersed more evenly, thereby making the alkali washing more uniform.

[0057] Optionally, the plurality of air holes 2121 on the partition plate 212 are arranged in an array to further improve the uniformity of gas dispersion.

[0058] Continue reading Figure 4 and Figure 6 In some embodiments, the alkali cleaning chamber 211 further includes a water seal chamber 211b, and a partition plate 213 is provided between the water seal chamber 211b and the reaction chamber 211a, one end of the partition plate 213 is sealed and connected to the top wall, and the other end is spaced apart from the bottom wall. The ventilation recovery system 2 for the electrolyte storage tank also includes a return pipe 24 and an exhaust pipe 25 both connected to the alkali cleaning tank 21, one end of the return pipe 24 is connected to the water seal chamber 211b, and the other end is used to communicate with the exhaust port of the electrolyte storage tank, one end of the exhaust pipe 25 is connected to the water seal chamber 211b, and the other end extends to the outside of the alkali cleaning chamber 211; wherein, a one-way valve 241 is installed on the return pipe 24 to prevent the liquid in the water seal chamber 211b from being sucked back into the return pipe 24. In this way, the water seal chamber 211b is connected to the reaction chamber 211a, so that the liquid level in the alkali cleaning tank 21 is balanced, which plays a role of water sealing. Based on this, even if the air supply pipe 23 stops supplying air to the electrolyte storage tank, due to the existence of water seal pressure, the air in the atmospheric environment can be prevented from entering the electrolyte storage tank without alkali washing, and the gas after alkali washing can be prevented from escaping through the exhaust port, while preventing the reflux gas of the return air pipe 24 from entering the air supply pipe 23 again.

[0059] See also Figure 1 , Figure 7 and Figure 8 Optionally, the alkali cleaning tank 21 includes a tank body 21a and a cover plate 21b sealed with the tank body 21a, a boss 21c is provided on the cover plate 21b, the boss 21c has a hollow cavity connected to the alkali cleaning chamber 211, and an exhaust pipe 25 is connected to the boss 21c, and the exhaust port of the exhaust pipe 25 is flush with the upper port of the boss 21c. In this way, the formation of an airflow dead zone can be prevented, and the structural design of the boss 21c is conducive to the convergence of airflow and prevents the alkali solution from flowing out through the exhaust port.

[0060] Optionally, the return air pipe 24 is provided with an adjusting component capable of adjusting the depth of its insertion into the water seal chamber 211b to adjust the water seal pressure.

[0061] See also Figure 1 , Fig. 9 and Fig.10 Further, the regulating assembly includes a connecting pipe 242, a sealing ring 243, a first regulating pipe 244, a fixing ring 245 and a second regulating pipe 246. The connecting pipe 242 is connected to the alkali cleaning tank 21 and communicates with the alkali cleaning chamber 211. The connecting pipe 242 is sleeved outside the return pipe 24, and the end of the connecting pipe 242 away from the alkali cleaning tank 21 is provided with a first external thread 2421. The sealing ring 243 is sleeved outside the return pipe 24, and the sealing ring 243 is located between the outer wall of the return pipe 24 and the inner wall of the connecting pipe 242. The first regulating pipe 244 has a first end and a second end opposite to each other, the inner wall of the first end is provided with a first internal thread 2441, and the outer wall of the second end is provided with a second external thread 2442, and the first internal thread 2441 is adapted to the first external thread 2421 so that the inner end surface of the first regulating pipe 244 presses the sealing ring 243 downward. The fixing ring 245 is sleeved outside the return air pipe 24, and a part of the fixing ring 245 is located between the outer wall of the return air pipe 24 and the inner wall of the first regulating pipe 244. The inner wall of the second regulating pipe 246 is provided with a second inner thread 2461 adapted to the second outer thread 2442. Among them, another part of the fixing ring 245 is located between the outer wall of the return air pipe 24 and the inner wall of the second regulating pipe 246, and the second regulating pipe 246 can press the fixing ring 245 inwardly so that the fixing ring 245 is pressed against the return air pipe 24.

[0062] Based on this, by tightening the first adjustment tube 244, the sealing ring 243 can be squeezed to deform the sealing ring 243, thereby sealing the gap between the pipeline and the adjustment component. By tightening the second adjustment tube 246, the fixing ring 245 can be squeezed to deform the fixing ring 245, so that the fixing ring 245 squeezes the return air pipe 24 inward, thereby fixing the return air pipe 24, achieving the effect of adjusting the height and fixing it at the corresponding height.

[0063] In some embodiments, the alkali cleaning tank 21 is provided with a liquid injection port 216 for adding alkali cleaning solution, and the air supply pipe 23 is sealed and connected to the liquid injection port 216. In this way, the liquid injection port 216 and the air supply port of the alkali cleaning tank 21 are combined into one, which can prevent the formation of an airflow dead zone due to the addition of a liquid injection port.

[0064] See also Figure 4 and Figure 6 Optionally, the alkali cleaning tank 21 is further provided with a drain port for discharging the alkali cleaning liquid, and the drain port is connected to a drain pipe 217, one end of which extends into the bottom of the alkali cleaning tank 21, for example, the distance between the lower end of the drain pipe 217 and the bottom wall of the reaction chamber 211a is smaller than the distance between the lower end of the isolation plate 213 and the bottom wall of the reaction chamber 211a. The other end of the drain pipe 217 extends out of the alkali cleaning tank 21, and the heights of the two ends of the drain pipe 217 are the same, or the end of the drain pipe 217 located outside the alkali cleaning tank 21 is lower than the end of the drain pipe 217 located inside the alkali cleaning tank 21. Based on this, the siphon principle is used to make the drain pipe 217 drain more thoroughly.

[0065] Based on the same invention purpose, the present application also provides a liquid flow battery.

[0066] See also Figure 1 and Fig.11 In some embodiments, the flow battery includes a charging and discharging system 1 and a ventilation recovery system 2 for the electrolyte storage tank in the above-mentioned embodiment.

[0067] The charging and discharging system 1 includes a battery stack 11, a positive electrode electrolyte storage tank 12, and a negative electrode electrolyte storage tank 13. The battery stack 11 includes a positive electrode and a negative electrode. The positive electrode electrolyte storage tank 12 stores a positive electrode electrolyte, and the negative electrode electrolyte storage tank 13 stores a negative electrode electrolyte. The positive electrode electrolyte storage tank 12 and the negative electrode electrolyte storage tank 13 are each provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the battery stack 11 through pipes. A pump body is provided on the pipe at the outlet. The pump body can be used to transport the positive electrode electrolyte in the positive electrode electrolyte storage tank 12 to the positive electrode inside the battery stack 11, and the negative electrode electrolyte in the negative electrode electrolyte storage tank 13 can be transported to the negative electrode inside the battery stack 11 to achieve charging and discharging. The pipe at the inlet can be used for the electrolyte that has been charged or discharged to flow back to the positive electrode electrolyte storage tank 12 and the negative electrode electrolyte storage tank 13.

[0068] The alkaline cleaning tank 21 of the ventilation recovery system 2 for the electrolyte storage tank is connected to the negative electrolyte storage tank 13 through the air supply pipe 23 and the return pipe 24, so that the compressed air after the gap is introduced into the negative electrolyte storage tank 13 through the air supply pipe 23, so that the reduced active substances accumulated in the negative electrolyte can be oxidized into an oxidized state, thereby improving the performance of the flow battery. The reacted gas is first refluxed to the alkaline cleaning tank 21 through the return pipe 24, and then discharged through the exhaust pipe 25 on the alkaline cleaning tank 21, which plays a water seal role.

[0069] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A ventilation recovery system for an electrolyte storage tank, characterized in that: include: An alkali washing tank is provided with an alkali washing chamber, and the alkali washing chamber can contain an alkali washing liquid; An air inlet pipe, one end of which is connected to the alkali cleaning tank and communicates with the alkali cleaning chamber, and the other end of which is used to communicate with a compressed air source; as well as A gas supply pipe has one end connected to the alkali washing tank and communicated with the alkali washing chamber, and the other end is used to connect to the electrolyte storage tank to transport the gas after alkali washing to the electrolyte storage tank.

2. The ventilation recovery system for an electrolyte storage tank according to claim 1, characterized in that: The alkali washing chamber is provided with a main flow pipe and a plurality of branch flow pipes; One end of the main flow pipe is sealed and connected to the air inlet pipe, and the other end is closed, and the main flow pipe extends along a first direction; The plurality of shunt pipes are all connected to the main pipe, the shunt pipes extend longitudinally along the second direction, and the plurality of shunt pipes are arranged at intervals along the first direction; Wherein, each of the diverter tubes is provided with a plurality of diverter holes arranged at intervals along the second direction, and the diverter holes penetrate through the tube wall of the diverter tube; The first direction intersects the second direction.

3. The ventilation recovery system for an electrolyte storage tank according to claim 1 or 2, characterized in that: The alkaline washing chamber comprises a reaction chamber, wherein the reaction chamber has a top wall and a bottom wall arranged opposite to each other, and a side wall connected between the top wall and the bottom wall; The air inlet pipe is connected to the side wall, and the air supply pipe is connected to the top wall.

4. The ventilation recovery system for an electrolyte storage tank according to claim 3, characterized in that: A plurality of partition plates are provided in the reaction chamber, and a plurality of air holes are provided on the partition plates, and one of the partition plates divides the reaction chamber into two chambers; The air inlet pipe and the air supply pipe are communicated with different chambers respectively.

5. The ventilation recovery system for an electrolyte storage tank according to claim 3, characterized in that: The alkali washing chamber also includes a water seal bin; An isolation plate is provided between the water seal chamber and the reaction chamber, one end of the isolation plate is sealedly connected to the top wall, and the other end is spaced apart from the bottom wall; The ventilation recovery system for the electrolyte storage tank also includes a return pipe and an exhaust pipe both connected to the alkali cleaning tank, one end of the return pipe is in communication with the water seal compartment, and the other end is used to communicate with the exhaust port of the electrolyte storage tank, one end of the exhaust pipe is in communication with the water seal compartment, and the other end extends to the outside of the alkali cleaning chamber; Wherein, a one-way valve is installed on the air return pipe to prevent the liquid in the water seal chamber from being sucked back into the air return pipe.

6. The ventilation recovery system for an electrolyte storage tank according to claim 5, characterized in that: The alkali washing tank comprises a tank body and a cover plate sealed with the tank body; The cover plate is provided with a boss, and the boss has a hollow cavity connected with the alkali washing cavity; The exhaust pipe is connected to the boss, and the exhaust port of the exhaust pipe is flush with the upper port of the boss.

7. The ventilation recovery system for an electrolyte storage tank according to claim 5, characterized in that: The return air pipe is provided with an adjusting component capable of adjusting the depth of its insertion into the water seal chamber; The adjustment component comprises: A connecting pipe connected to the alkali cleaning tank and communicating with the alkali cleaning chamber, wherein the connecting pipe is sleeved outside the air return pipe, and an end of the connecting pipe away from the alkali cleaning tank is provided with a first external thread; A sealing ring, which is sleeved outside the return air pipe and is located between the outer wall of the return air pipe and the inner wall of the connecting pipe; A first adjusting tube having a first end and a second end opposite to each other, the inner wall of the first end being provided with a first internal thread, the outer wall of the second end being provided with a second external thread, the first internal thread being adapted to the first external thread so that the inner end surface of the first adjusting tube presses the sealing ring downward; A fixing ring, which is sleeved outside the air return pipe, and the fixing ring portion is located between the outer wall of the air return pipe and the inner wall of the first regulating pipe; A second adjusting tube, the inner wall of which is provided with a second internal thread adapted to the second external thread; Wherein, another part of the fixing ring is located between the outer wall of the return air pipe and the inner wall of the second regulating pipe; The second regulating tube can press the fixing ring inwardly so that the fixing ring is pressed against the air return tube.

8. The ventilation recovery system for an electrolyte storage tank according to claim 1, characterized in that: The alkali cleaning tank is provided with a liquid injection port for adding alkali cleaning liquid; The air supply pipe is sealed and connected to the liquid injection port.

9. The ventilation recovery system for an electrolyte storage tank according to claim 8, characterized in that: The alkali cleaning tank is also provided with a drain port for discharging the alkali cleaning liquid; The drain port is connected to a drain pipe, one end of the drain pipe extends into the bottom of the alkali cleaning tank, and the other end extends out of the alkali cleaning tank, and the heights of both ends of the drain pipe are the same, or the end of the drain pipe located outside the alkali cleaning tank is lower than the end of the drain pipe located inside the alkali cleaning tank.

10. A liquid flow battery, characterized in that: It comprises a ventilation recovery system for an electrolyte storage tank as described in any one of claims 1 to 9.

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