A flow battery electrolyte storage device

Abstract

This application relates to a flow battery electrolyte storage device, specifically in the field of flow battery electrolyte technology. The device includes a tank shell and a heat exchange tube. The tank shell contains a spiral-shaped storage tube arranged vertically inside. The storage tube contains electrolyte and is connected to a liquid pump. The heat exchange tube is spiral-shaped and fitted around the storage tube. The heat exchange tube contains heat exchange fluid and is connected to a liquid supply and circulation device. The electrolyte and heat exchange fluid flow in opposite directions. By using a spiral-shaped, vertically arranged storage tube, the electrolyte can form an orderly stratification within the storage tube, avoiding the formation of flow dead zones. This also reduces the occurrence of side reactions, such as hydrogen evolution, due to the mixing of two different ions. Furthermore, it increases the heat exchange area and enables countercurrent heat exchange, further ensuring the heat exchange efficiency of the device.

Description

Technical Field

[0001] This application relates to the field of flow battery electrolyte technology, and in particular to a flow battery electrolyte storage device. Background Technology

[0002] With the large-scale integration of renewable energy and the rapid development of energy storage technology, flow batteries are considered one of the most promising large-scale energy storage technologies due to their advantages such as independent adjustable energy and power, high safety, and long cycle life. The energy of a flow battery is stored in an external electrolyte, which is transported to the stack through a circulation pump to achieve electrochemical reactions. As one of the core components of the energy storage system, the structural design and functional optimization of the electrolyte storage tank have a decisive impact on the system performance.

[0003] Existing technology involves a heat exchanger for a flow battery energy storage system. The flow battery energy storage system includes an electrolyte storage tube, which includes an electrolyte inlet and an electrolyte outlet. By setting a heat exchange tube outside the storage tube, the heat exchange tube can control the inflow of different media, the inlet valve of the cooling medium, the inlet valve of the heat insulation medium, and the outlet valve of the medium that can control the outflow of the medium.

[0004] The large-capacity storage tanks used in the above-mentioned and existing flow battery electrolyte applications have a large volume and a large radial temperature gradient. The electrolyte in the central area is prone to forming local hot spots, which leads to an aggravation of the hydrogen evolution side reaction. At the same time, the mixing of different ions in the electrolyte storage tube will also aggravate the hydrogen evolution reaction. Summary of the Invention

[0005] This application provides a flow battery electrolyte storage device that can solve the problems of uncontrollable electrolyte flow path and difficulty in rapid temperature control inside existing storage tubes, which leads to an aggravated hydrogen evolution reaction.

[0006] The technical solution of this application is as follows: A flow battery electrolyte storage device, comprising:

[0007] The tank has an outer shell, and inside the outer shell is a spiral storage tube arranged vertically. The storage tube contains electrolyte and is connected to a liquid pump.

[0008] A heat exchange tube, which is spiral in shape and sleeved on the outside of the storage tube, contains a heat exchange fluid and is connected to a liquid supply and circulation device. The electrolyte flows in the opposite direction to the heat exchange fluid.

[0009] By adopting the above scheme, and using a spiral-shaped and vertically arranged storage tube, when the electrolyte flows in the storage tube, the charged ions leave the fuel cell stack and enter from the top of the storage tank. After being guided by the spiral-shaped storage tube, the ions to be charged that are concentrated at the bottom of the storage tube are pushed into the fuel cell stack, forming a plug flow for charging. The plug flow formed inside the storage tube can make the ions inside the storage tube form an orderly stratification, avoiding the generation of flow dead zones, and reducing the occurrence of side reactions, namely hydrogen evolution reaction, due to the mixing of two different ions.

[0010] Meanwhile, the spiral storage tube is also equipped with a spiral heat exchange tube on the outside. Compared with the traditional storage tube, the heat exchange area is greatly increased, which can quickly regulate the temperature of the electrolyte inside. At the same time, since the flow direction of the electrolyte is opposite to that of the heat exchange liquid, countercurrent heat exchange is formed, which further ensures the heat exchange efficiency of the device and also reduces the probability of hydrogen evolution reaction.

[0011] In one embodiment of this application, the heat exchange tube includes a plurality of heat exchange curved tubes, which are arranged along the height direction and connected to each other. A heat insulation ring is provided between adjacent heat exchange curved tubes, and each heat exchange curved tube is connected to a liquid supply circulation device.

[0012] By adopting the above scheme, the heat exchange tubes are segmented in the vertical direction. Since the electrolyte flowing out of the fuel cell stack has the highest temperature and the electrolyte about to enter the fuel cell stack for charging has the lowest temperature, the flow rate of the coolant in the heat exchange curved tubes at different heights is controlled, thereby controlling the heat exchange efficiency of different sections of the heat exchange curved tubes. This allows the electrolyte inside the device to undergo regional heat exchange treatment, further improving the overall heat exchange efficiency of the device.

[0013] In one embodiment of this application, the storage tube is provided with an inlet pipe at the upper end and an outlet pipe at the lower end. One end of the inlet pipe is connected to the battery reactor, and the other end is connected to the storage tube through a buffer device. One end of the outlet pipe is connected to the liquid pump, and the other end is connected to the storage tube. The heat exchange curved tube is provided with a heat exchange inlet pipe at the lower end and a heat exchange outlet pipe at the other end. Both the heat exchange inlet pipe and the heat exchange outlet pipe are connected to a liquid supply and circulation device.

[0014] By adopting the above scheme, with an inlet pipe above the storage tube and an outlet pipe below, the electrolyte can form a flow path from top to bottom. Each heat exchange curved tube is fed from the bottom and circulates from the top, enabling each heat exchange curved tube to achieve countercurrent heat exchange with the electrolyte. This allows each heat exchange curved tube to generate a continuous and uniform temperature difference, further improving the heat exchange efficiency.

[0015] In one embodiment of this application, the storage tube includes:

[0016] An anti-corrosion layer, wherein the anti-corrosion layer is a spiral component;

[0017] A thermally conductive layer is coaxially disposed outside the anti-corrosion layer.

[0018] By adopting the above scheme, the storage tube is set as a double-layer component. The internal anti-corrosion layer can effectively prevent the internal electrolyte from corroding the storage tube itself. At the same time, a high-strength heat-conducting layer is set to ensure the structural strength of the storage tube. By reducing the thickness of the heat-conducting layer, its heat exchange efficiency is further guaranteed.

[0019] In one embodiment of this application, a liquid level monitoring component is further included, the liquid level monitoring component comprising:

[0020] The first connecting bend has one end penetrating the outer shell of the tank and connected to the upper end of the storage tube.

[0021] The second connecting bend has one end penetrating through the outer shell of the tank and connected to the lower end of the storage tube.

[0022] A liquid level tube, which is a transparent component, is arranged vertically, and its two ends are respectively connected to the other ends of the first connecting bend and the second connecting bend. The surface of the liquid level tube is provided with scale.

[0023] By adopting the above scheme and setting up a liquid level tube, the liquid level inside the storage tube can be observed through the external transparent liquid level tube, ensuring that some space is reserved inside to store hydrogen, thus improving the safety of the device.

[0024] In one embodiment of this application, a detection chamber is further included. The detection chamber is assembled on the upper end of the outer shell of the tank. The detection chamber is connected to the upper end of the storage tube through an exhaust pipe. The detection chamber is provided with a hydrogen detection element extending into the interior of the detection chamber for detecting the hydrogen concentration inside the detection chamber, so as to calculate the volume of hydrogen gas released inside the storage tube.

[0025] By adopting the above scheme, by setting up a detection chamber and connecting the detection chamber to the upper part of the storage tube, the hydrogen produced in the storage tube can enter the detection chamber through the exhaust pipe, and the hydrogen concentration inside the detection chamber can be monitored in real time to monitor whether the hydrogen evolution reaction in the storage tube is violent and to determine whether the entire device is working properly.

[0026] In one embodiment of this application, the hydrogen detection device includes a first detection device and a second detection device. The detection chamber has two interconnected detection chambers with equal volumes. One end of the first detection device and the second detection device extends into the two detection chambers respectively to detect the hydrogen concentration inside the two detection chambers.

[0027] By adopting the above scheme, by setting a first detection element and a second detection element, and dividing the detection chamber into two detection chambers of equal volume, the hydrogen concentration in the two detection chambers is detected by the first and second detection elements respectively. Based on the concentration changes in the two detection chambers, the flow rate of hydrogen can be calculated, and thus the total amount of hydrogen produced by the hydrogen evolution reaction inside the storage tube can be calculated.

[0028] In one embodiment of this application, a partition is fixedly connected to one side of the inner wall of the detection chamber. The partition is placed horizontally and extends to the other side. A communication gap is provided between the partition and the inner wall of the other side of the detection chamber to form two detection chambers.

[0029] By adopting the above scheme, a partition is installed inside the detection chamber, which divides the detection chamber into two interconnected detection chambers. By designing the position and area of ​​the partition, the volumes of the two detection chambers are made equal, so as to facilitate the subsequent calculation of hydrogen flow rate and precipitation volume.

[0030] In one embodiment of this application, the buffer device includes:

[0031] A buffer tube, one end of which is connected to the inlet pipe and the other end of which is connected to the storage tube, wherein the diameter of the buffer tube is larger than the diameter of the inlet pipe;

[0032] A buffer plate is coaxially and fixedly connected to the inner wall of the buffer tube, and the buffer plate has multiple release holes inside.

[0033] By adopting the above scheme, by setting a buffer tank at the inlet pipe and designing the diameter of the buffer pipe to be larger than that of the inlet pipe, the electrolyte, after being charged, enters the buffer pipe and its flow rate is reduced by depressurization. When it falls onto the buffer plate, its kinetic energy is further consumed. Finally, the electrolyte can flow evenly from each release hole into the storage tube. This allows the high-temperature electrolyte flowing out of the fuel cell stack to flow into the storage tube more evenly at a lower speed, reducing the occurrence of chaotic liquid flow paths inside the storage tube and thus reducing the possibility of hydrogen evolution reaction.

[0034] In one embodiment of this application, the outer shell of the tank is provided with a tubular interlayer, and the outer shell of the tank is provided with a heat insulation layer inside the tubular interlayer.

[0035] By adopting the above scheme, by setting a tubular jacket inside the outer shell of the tank and setting a heat insulation layer inside the tubular jacket, the influence of the external ambient temperature on the temperature of the electrolyte inside the storage tube is reduced, thereby further improving the device's ability to control the electrolyte temperature.

[0036] In summary, this application includes at least one of the following beneficial technical effects: by employing a spiral-shaped storage tank and setting a spiral-shaped heat exchange tube on the outside of the storage tank, the heat exchange area between the electrolyte and the heat exchange liquid is increased. At the same time, the spiral-shaped storage tube arranged vertically can form an electrolyte with a uniform concentration gradient, so that the upper part of the storage tube is enriched with fully charged ions and the lower part is enriched with ions to be charged. This reduces the situation where the concentration of ions to be charged at the lower end of the storage tube decreases due to electrolyte disturbance, thereby forcing the potential at the lower end to rise and thus intensifying the hydrogen evolution reaction.

[0037] By configuring the heat exchange tubes into multiple vertically segmented curved tubes, and individually equipping each curved tube with a heat exchange inlet pipe and a heat exchange outlet pipe, and by placing a heat exchange inlet pipe at the bottom and a heat exchange outlet pipe at the top of each curved tube, a heat exchange fluid flow completely opposite to that of the electrolyte can be formed in each curved tube. This allows the device to not only precisely control the electrolyte temperature at different heights inside the storage tube, but also to form countercurrent heat exchange with the electrolyte, resulting in a uniform and continuous temperature difference between the heat exchange tubes and the storage tube, which helps to further improve heat exchange efficiency.

[0038] By setting up two interconnected detection chambers of equal volume, hydrogen gas is discharged into the detection chamber after production. By simultaneously detecting the concentration between the two detection chambers, the rate of hydrogen evolution reaction can be calculated, thereby calculating the total amount of hydrogen gas produced by the device. This allows the device to perform real-time and systematic data analysis on the intensity of the hydrogen evolution reaction in the internal electrolyte. Attached Figure Description

[0039] Figure 1 This is a planar sectional view of a flow battery electrolyte storage device provided in the embodiments of this application;

[0040] Figure 2 This is a perspective view of a flow battery electrolyte storage device provided in the embodiments of this application;

[0041] Figure 3 This is a planar sectional view of a buffer tube of a flow battery electrolyte storage device provided in an embodiment of this application;

[0042] Figure 4This is a perspective view of the outer shell of a flow battery electrolyte storage device provided in the embodiments of this application;

[0043] Figure 5 This is a planar sectional view of a heat exchange curved tube for a flow battery electrolyte storage device provided in an embodiment of this application;

[0044] Figure 6 This is a planar sectional view of the detection chamber of a flow battery electrolyte storage device provided in the embodiments of this application.

[0045] Explanation of reference numerals in the attached drawings: 1. Tank outer shell; 11. Tubular jacket; 12. Insulation layer; 2. Storage tube; 201. Anti-corrosion layer; 202. Heat-conducting layer; 21. Liquid inlet pipe; 22. Liquid outlet pipe; 23. Buffer device; 231. Buffer pipe; 232. Buffer plate; 233. Release hole; 3. Heat exchange pipe; 31. Heat exchange curved pipe; 311. Heat exchange liquid inlet pipe; 312. Heat exchange liquid outlet pipe; 32. Insulation ring; 4. Liquid level observation assembly; 41. First connecting bend; 42. Second connecting bend; 43. Liquid level pipe; 5. Detection chamber; 51. Exhaust pipe; 52. Hydrogen detection element; 521. First detection element; 522. Second detection element; 53. Detection chamber; 54. Partition; 55. Connecting gap. Detailed Implementation

[0046] The following is in conjunction with the appendix Figures 1-6 This application provides a further detailed description of a flow battery electrolyte storage device.

[0047] An embodiment of this application provides a flow battery electrolyte storage device, comprising: a tank shell 1 and a heat exchange tube 3.

[0048] Please see Figure 1 and Figure 2 The outer shell 1 of the tank is equipped with a spiral-shaped storage tube 2 arranged vertically inside. The storage tube 2 contains electrolyte and is connected to a liquid pump. The heat exchange tube 3 is spiral-shaped and sleeved on the outside of the storage tube 2. The heat exchange tube 3 contains heat exchange liquid and is connected to a liquid supply and circulation device. The flow direction of the electrolyte and the heat exchange liquid is opposite. By using the spiral-shaped and vertically arranged storage tube 2, the electrolyte inside can be guided through the spiral storage tube 2, thereby forming an orderly stratification of ions inside the storage tube 2, avoiding the generation of flow dead zones, and also reducing the occurrence of side reactions. Since the flow direction of the electrolyte is opposite to that of the heat exchange liquid, countercurrent heat exchange is formed, further ensuring the heat exchange efficiency of the device.

[0049] In this embodiment, the liquid supply circulation device can be a water pump, and the heat exchange liquid can be distilled water;

[0050] The electrolyte inside the storage tube 2 can flow from below to the fuel cell stack for charging. After charging, the electrolyte is pushed back to the upper end of the storage tube 2 by the liquid pump.

[0051] Please see Figure 1 and Figure 2 The heat exchange tube 3 includes multiple heat exchange curved tubes 31, which are arranged along the height direction and connected to each other. A heat insulation ring 32 is provided between adjacent heat exchange curved tubes 31. Each heat exchange curved tube 31 is connected to a liquid supply circulation device. By controlling the flow rate of coolant in the heat exchange curved tubes 31 at different heights, the heat exchange efficiency of different sections of the heat exchange curved tubes 31 can be controlled, so that the electrolyte inside the device can be heat exchanged in different areas.

[0052] In this embodiment, each heat exchange curved tube 31 is also equipped with a heating rod inside, which is used to heat and keep the electrolyte warm at night or in winter to prevent the electrolyte from salting out due to excessively low temperature.

[0053] Please see Figure 1 and Figure 2 The storage tube 2 has an inlet pipe 21 at the upper end and an outlet pipe 22 at the lower end. One end of the inlet pipe 21 is connected to the battery reactor, and the other end is connected to the storage tube 2 through a buffer device 23. One end of the outlet pipe 22 is connected to the liquid pump, and the other end is connected to the storage tube 2. The heat exchange curved tube 31 has a heat exchange inlet pipe 311 at the lower end and a heat exchange outlet pipe 312 at the other end. Both the heat exchange inlet pipe 311 and the heat exchange outlet pipe 312 are connected to the liquid supply and circulation device. By setting the inlet pipe 21 above the storage tube 2 and the outlet pipe 22 below, the electrolyte can form a flow path from top to bottom, and each heat exchange curved tube 31 can be fed from the bottom and circulated from the top, so that each heat exchange curved tube 31 can achieve countercurrent heat exchange with the electrolyte, thereby improving the heat exchange efficiency.

[0054] Please see Figure 5 The storage tube 2 includes an anti-corrosion layer 201 and a heat-conducting layer 202. The anti-corrosion layer 201 is a spiral component, and the heat-conducting layer 202 is coaxially disposed outside the anti-corrosion layer 201. The storage tube 2 is configured as a double-layer component to improve its own corrosion resistance while ensuring its structural strength. The heat exchange efficiency can be further guaranteed by reducing the thickness of the heat-conducting layer 202.

[0055] In this embodiment, the thermally conductive layer 202 can be a stainless steel component, and the anti-corrosion layer 201 can be a polyvinylidene fluoride component.

[0056] Please see Figure 1 and Figure 2 The device also includes a liquid level observation component 4, which comprises a first connecting bend 41, a second connecting bend 42, and a liquid level tube 43. One end of the first connecting bend 41 penetrates the outer shell 1 of the tank and is connected to the upper end of the storage tube 2. One end of the second connecting bend 42 penetrates the outer shell 1 of the tank and is connected to the lower end of the storage tube 2. The liquid level tube 43 is a transparent component and is arranged vertically. Both ends of the liquid level tube 43 are connected to the other ends of the first connecting bend 41 and the second connecting bend 42, respectively. The surface of the liquid level tube 43 is marked with graduations. By setting up the liquid level tube 43 and utilizing the principle of communicating vessels, the liquid level inside the storage tube 2 can be observed through the external transparent liquid level tube 43, ensuring that some space is reserved inside to store hydrogen and improving the safety of the device.

[0057] In this embodiment, the liquid level tube 43 can be a tempered glass tube.

[0058] Please see Figure 1 and Figure 6 It also includes a detection chamber 5, which is mounted on the upper end of the outer shell 1 of the tank. The detection chamber 5 is connected to the upper end of the storage tube 2 through an exhaust pipe 51. The detection chamber 5 is provided with a hydrogen detection element 52 extending into the interior of the detection chamber 5, which is used to detect the hydrogen concentration inside the detection chamber 5 to calculate the volume of hydrogen gas released inside the storage tube 2. By setting up the detection chamber 5 and monitoring the hydrogen concentration inside the detection chamber 5 in real time, the device can monitor whether the hydrogen evolution reaction in the storage tube 2 is vigorous and determine whether the entire device is working properly.

[0059] Please see Figure 1 and Figure 6 The hydrogen detection element 52 includes a first detection element 521 and a second detection element 522. The detection chamber 5 has two interconnected detection chambers 53 with equal volumes. One end of the first detection element 521 and the second detection element 522 extends into the two detection chambers 53 to detect the hydrogen concentration inside the two detection chambers 53 respectively. By using the first detection element 521 and the second detection element 522 to detect the hydrogen concentration in the two detection chambers 53 respectively, the hydrogen flow rate can be calculated based on the concentration change in the two detection chambers 53, and then the total amount of hydrogen produced by the hydrogen evolution reaction inside the storage tube 2 can be estimated.

[0060] In this embodiment, both the first detection element 521 and the second detection element 522 can be hydrogen concentration sensors or hydrogen concentration detectors.

[0061] Please see Figure 6A partition 54 is fixedly connected to one side of the inner wall of the detection chamber 5. The partition 54 is placed horizontally and extends to the other side. A communication gap 55 is provided between the partition 54 and the inner wall of the other side of the detection chamber 5 to form two detection chambers 53. The volumes of the two detection chambers 53 are designed to be equal to facilitate the subsequent calculation of the hydrogen flow rate and the volume of hydrogen evolution.

[0062] In this embodiment, the first detection chamber 53 into which hydrogen flows from the exhaust pipe 51 is designated as detection chamber one, and the second detection chamber 53 into which hydrogen flows out from detection chamber one and diffuses through the connecting gap 55 is designated as detection chamber two. A concentration gradient is established, and the hydrogen generation rate can be derived based on the Fick diffusion law. The connecting gap 55 is narrow enough to ensure that the hydrogen flow is resisted.

[0063] Since the connecting gap 55 formed between the partition 54 and the inner wall has a defined cross-sectional area S and diffusion path length L, hydrogen gas will be obstructed when it diffuses from the detection chamber 1, which is directly connected to the exhaust pipe 51, to the detection chamber 2, resulting in a concentration difference between the two chambers.

[0064] By setting a controller and pre-storing the hydrogen diffusion coefficient D, during the detection process, the first concentration value C1 of detection chamber one is measured by the first detection element 521, and the second concentration value C2 of detection chamber two is measured by the second detection element 522.

[0065] The instantaneous diffusion velocity of hydrogen is calculated using the formula Q = K ·(C1 - C2), where K is a structural constant related to the gap geometry and diffusion coefficient, i.e., formula K=D·(S / L).

[0066] By integrating the calculated instantaneous flow rate over time, the total volume of hydrogen gas released inside the outer shell 1 of the tank can be estimated. This dual-chamber differential detection method can effectively filter out detection errors caused by gas pressure fluctuations, making it more accurate than single-point detection.

[0067] Please see Figure 1 and Figure 3The buffer device 23 includes a buffer tube 231 and a buffer plate 232. One end of the buffer tube 231 is connected to the inlet pipe 21, and the other end is connected to the storage tube 2. The diameter of the buffer tube 231 is larger than the diameter of the inlet pipe 21. The buffer plate 232 is coaxially fixedly connected to the inner wall of the buffer tube 231. The buffer plate 232 has multiple release holes 233 inside. By setting the buffer tube 231 at the inlet pipe 21 and designing the diameter of the buffer tube 231 to be larger than the diameter of the inlet pipe 21, after the charged electrolyte enters the buffer tube 231, the flow rate of the electrolyte decreases due to the increased pipe diameter. At the same time, when the electrolyte falls on the buffer plate 232, its kinetic energy is further consumed, so that the electrolyte can flow down evenly from each release hole 233. This reduces the situation where the liquid inside the storage tube 2 experiences chaotic flow path when the electrolyte enters, thereby reducing the possibility of hydrogen evolution reaction.

[0068] Please see Figure 1 and Figure 4 The outer shell 1 of the tank is provided with a tubular interlayer 11, and the outer shell 1 of the tank is provided with a heat insulation layer 12 inside the tubular interlayer 11. By providing a heat insulation layer 12 inside the tubular interlayer 11, the influence of the external ambient temperature on the electrolyte temperature inside the storage tube 2 is reduced, thereby ensuring the device's ability to regulate the electrolyte temperature.

[0069] In this embodiment, the insulation layer 12 can be fiberglass wool or rock wool.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flow battery electrolyte storage device, characterized in that, include: Tank shell (1), the tank shell (1) is provided with a spiral storage tube (2) arranged vertically inside the tank shell (1), the storage tube (2) is provided with electrolyte inside and is connected to a liquid pump; heat exchange tube (3), the heat exchange tube (3) is spiral and is sleeved on the outside of the storage tube (2), the heat exchange tube (3) is provided with heat exchange liquid inside and is connected to a liquid supply circulation device, the electrolyte and the heat exchange liquid flow in opposite directions; The heat exchange tube (3) includes multiple heat exchange curved tubes (31), which are arranged along the height direction and connected to each other. A heat insulation ring (32) is provided between adjacent heat exchange curved tubes (31), and each heat exchange curved tube (31) is connected to a liquid supply circulation device. The storage tube (2) has an inlet pipe (21) at the upper end and an outlet pipe (22) at the lower end. One end of the inlet pipe (21) is connected to the battery reactor, and the other end is connected to the storage tube (2) through a buffer device (23). One end of the outlet pipe (22) is connected to the liquid pump, and the other end is connected to the storage tube (2). The heat exchange curved tube (31) has a heat exchange inlet pipe (311) at the lower end and a heat exchange outlet pipe (312) at the other end. Both the heat exchange inlet pipe (311) and the heat exchange outlet pipe (312) are connected to the liquid supply circulation device. By using a spiral-shaped and vertically arranged storage tube (2), when the electrolyte flows in the storage tube (2), the charged ions leave the fuel cell stack and enter from the top of the storage tube (2). After being guided by the spiral-shaped storage tube (2), the ions to be charged that are enriched at the bottom of the storage tube (2) will be pushed into the fuel cell stack to form a flow for charging. The flow formed inside the storage tube (2) can make the ions inside the storage tube (2) form an orderly stratification, avoid the generation of flow dead zones, and reduce the occurrence of side reactions, namely hydrogen evolution reaction, due to the mixing of two different ions.

2. The flow battery electrolyte storage device according to claim 1, characterized in that: The storage tube (2) includes: an anti-corrosion layer (201), which is a spiral component; and a heat-conducting layer (202), which is coaxially disposed outside the anti-corrosion layer (201).

3. The flow battery electrolyte storage device according to claim 1, characterized in that, It also includes a liquid level observation component (4), which includes: a first connecting bend (41), one end of which penetrates the outer shell of the tank (1) and is connected to the upper end of the storage tube (2); a second connecting bend (42), one end of which penetrates the outer shell of the tank (1) and is connected to the lower end of the storage tube (2); and a liquid level tube (43), which is a transparent material component, is arranged vertically, and its two ends are respectively connected to the other ends of the first connecting bend (41) and the second connecting bend (42), and the surface of the liquid level tube (43) is provided with a scale.

4. The electrolyte storage device for a flow battery according to claim 1, characterized in that: It also includes a detection chamber (5), which is mounted on the upper end of the outer shell (1) of the tank body. The detection chamber (5) is connected to the upper end of the storage tube (2) through an exhaust pipe (51). The detection chamber (5) is provided with a hydrogen detection element (52) extending into the detection chamber (5) to detect the hydrogen concentration inside the detection chamber (5) in order to calculate the volume of hydrogen gas released inside the storage tube (2).

5. The electrolyte storage device for a flow battery according to claim 4, characterized in that: The hydrogen detection element (52) includes a first detection element (521) and a second detection element (522). The detection chamber (5) has two interconnected detection chambers (53) with equal volumes. One end of the first detection element (521) and the second detection element (522) extends into the two detection chambers (53) respectively to detect the hydrogen concentration inside the two detection chambers (53).

6. The flow battery electrolyte storage device according to claim 5, characterized in that: A partition (54) is fixedly connected to one side of the inner wall of the detection chamber (5). The partition (54) is placed horizontally and extends to the other side. A communication gap (55) is provided between the partition (54) and the inner wall of the other side of the detection chamber (5) to form two detection chambers (53).

7. The flow battery electrolyte storage device according to claim 1, characterized in that, The buffer device (23) includes: a buffer tube (231), one end of which is connected to the liquid inlet tube (21) and the other end of which is connected to the storage tube (2), the diameter of the buffer tube (231) being larger than the diameter of the liquid inlet tube (21); and a buffer plate (232), which is coaxially fixedly connected to the inner wall of the buffer tube (231), and the buffer plate (232) having multiple release holes (233) inside.

8. The electrolyte storage device for a flow battery according to claim 1, characterized in that: The outer shell (1) of the tank is provided with a tubular interlayer (11), and the outer shell (1) of the tank is provided with a heat insulation layer (12) inside the tubular interlayer (11).

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