Voltage stabilizing filter device and flow battery

Abstract

The application relates to a voltage-stabilizing filter device and a flow battery. The voltage-stabilizing filter device is applied to the flow battery. The voltage-stabilizing filter device comprises a main body with an inner cavity, a liquid inlet and a liquid outlet; a filter body arranged in the inner cavity and separating the inner cavity into a first cavity and a second cavity, the liquid inlet, the first cavity, the second cavity and the liquid outlet being sequentially communicated; and an elastic body arranged in the first cavity and / or the second cavity, the elastic body defining a gas cavity for filling gas by itself or together with the main body, and the elastic body being configured to deform when there is a pressure difference between the pressure in the gas cavity and the pressure of electrolyte flowing through the inner cavity, so as to adjust the pressure of the electrolyte. The voltage-stabilizing filter device and the flow battery can improve the reliability and service life of the flow battery.

Description

Technical Field

[0001] This application relates to the field of flow battery technology, specifically to a voltage-stabilized filtration device and a flow battery. Background Technology

[0002] Flow batteries are a new type of electrochemical energy storage technology. The electrolyte flows out of the storage tank through pipelines to the stack to react and then returns to the storage tank to complete the charge-discharge cycle.

[0003] During the electrolyte circulation process of a flow battery, impurities may not be cleaned properly during production, or some structures in the battery stack may fall off, causing blockage at the electrolyte inlet and affecting the inlet flow rate. This could further prevent the battery stack from functioning properly.

[0004] Furthermore, the electrolyte is continuously circulated via a circulation pump. However, during the operation of the circulation pump, the pressure is not always completely stable. The rotation of the impeller in the circulation pump, as well as the air mixed in during turbulence, will cause periodic pressure fluctuations and uncertain instantaneous pressure shocks. Due to limitations in equipment or pipelines, such pressure fluctuations and instantaneous pressure shocks are unpredictable and difficult to avoid. When pressure fluctuations or instantaneous pressure shocks enter the flow battery stack, the ion exchange membrane inside the stack may suffer mechanical damage due to the instantaneous pressure shock. In severe cases, it may even lead to ion exchange membrane rupture, causing a short circuit inside the stack and resulting in failure, and affecting the service life of the flow battery. Utility Model Content

[0005] Therefore, it is necessary to provide a voltage-stabilizing filter device and a flow battery that can improve the reliability and service life of flow battery operation, in order to address the above problems.

[0006] A voltage-stabilizing filter device is used in a flow battery, the voltage-stabilizing filter device comprising: The main body has an inner cavity, a liquid inlet, and a liquid outlet; A filter element is disposed within the inner cavity, dividing the inner cavity into a first cavity and a second cavity. The inlet, the first cavity, the second cavity, and the outlet are sequentially connected. An elastomer is disposed within the first cavity and / or the second cavity, and the elastomer defines or the elastomer and the body together define a gas cavity for filling gas, and the elastomer is configured to deform when there is a pressure difference between the pressure in the gas cavity and the pressure of the electrolyte flowing through the cavity, so as to adjust the pressure of the electrolyte.

[0007] In some embodiments, the elastomer is located within the second cavity and is disposed toward the filter body.

[0008] In some embodiments, the elastomer is located away from the filter body relative to the liquid outlet.

[0009] In some embodiments, the pressure stabilizing filter further includes an air inlet pipe and a valve, the air inlet pipe being disposed on the main body and communicating with the air chamber, and the valve being disposed on the air inlet pipe.

[0010] In some embodiments, the pressure-stabilizing filter device further includes a guide conductor, which is spaced apart at the bottom of the filter body and divides the first cavity into a liquid passage chamber and a dirt collection chamber arranged sequentially along the direction of gravity. The liquid passage chamber is connected to the liquid inlet. A guide hole is provided on the guide conductor to connect the liquid passage chamber and the dirt collection chamber. The cross-sectional area of ​​the guide conductor gradually decreases in the direction of gravity, and the guide hole is located at the lowest position of the guide conductor in the direction of gravity.

[0011] In some embodiments, the slurry conductor includes a first plate and a second plate, the first plate and the second plate being spliced ​​together and forming the slurry hole at the splice.

[0012] In some embodiments, the cross-sectional area of ​​at least a portion of the dredging hole gradually decreases in the direction of gravity.

[0013] In some embodiments, the pressure-stabilizing filter further includes an adsorption structure disposed at the bottom of the dirt collection chamber, and the projection of the dredging hole in the direction of gravity falls onto the adsorption structure.

[0014] In some embodiments, the main body includes a first part and a second part, wherein the first part and the second part are detachably connected; The filter element, the elastomer, and the conductive material are all located within the first part, and the adsorption structure is located within the second part.

[0015] A flow battery includes a storage tank, a circulation pump, a voltage-stabilizing filter device as described in any of the above embodiments, and a fuel cell stack arranged sequentially. The outlet of the circulation pump is connected to the inlet of the voltage-stabilizing filter device, and the outlet of the voltage-stabilizing filter device is connected to the inlet of the fuel cell stack.

[0016] Compared with the prior art, this application has the following beneficial effects: The aforementioned voltage-stabilizing filter device and flow battery, during the process of the electrolyte flowing through the filter body, allow impurities in the electrolyte to adhere to the filter body, thereby achieving the purpose of filtering the electrolyte and ensuring that the electrolyte entering the battery stack is free of impurities. This solves the problem of electrolyte clogging and improves the reliability of the flow battery operation.

[0017] Furthermore, an inert gas matching the design pressure for the flow battery's operation is pre-injected into the gas chamber. When the electrolyte pressure is higher than the pressure inside the gas chamber, the electrolyte compresses the elastomer, causing the gas chamber volume to decrease. This, in turn, relatively increases the volume of electrolyte within the main body, compensating for any sudden increase in electrolyte flow rate and thus stabilizing the electrolyte pressure. Similarly, when the electrolyte pressure is lower than the pressure inside the gas chamber, the elastomer expands under the influence of the gas, increasing the gas chamber volume. Since the main body volume remains constant, the increased gas chamber volume relatively decreases the volume of electrolyte within the main body, compensating for any decrease in instantaneous electrolyte flow rate and thus stabilizing the electrolyte pressure. This reduces the likelihood of mechanical damage or even breakage of the ion exchange membrane inside the stack due to sudden pressure shocks, lowering the failure rate and extending the lifespan of the flow battery. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a flow battery in one embodiment of this application; Figure 2 for Figure 1 The diagram shows the structure of the voltage stabilizing filter device and pipeline in a flow battery.

[0019] Icon labels: 100. Flow battery; 10. Storage tank; 20. Circulation pump; 30. Pressure stabilizing filter; 40. Fuel cell stack; 50. Piping; 31. Main body; 311. Inner cavity; 3111. First cavity; 3111a. Liquid passage cavity; 3111b. Sludge collection cavity; 3112. Second cavity; 312. Liquid inlet; 313. Liquid outlet; 314. Air cavity; 315. First part; 316. Second part; 32. Filter body; 33. Elastomer; 34. Air inlet pipe; 35. Valve; 36. Conductor; 361. Guide hole; 3611. Conical hole section; 3612. Cylindrical hole section; 362. First plate; 363. Second plate; 37. Adsorption structure; 38. Flange structure; 381. First flange; 382. Second flange; 383. Bolt; X, direction of gravity. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] Flow batteries are a new type of electrochemical energy storage technology. The electrolyte flows out of the storage tank through pipelines to the stack to react and then returns to the storage tank to complete the charge-discharge cycle.

[0027] During the electrolyte circulation process of a flow battery, impurities may not be cleaned properly during production, or some structures in the battery stack may fall off, causing blockage at the electrolyte inlet and affecting the inlet flow rate. This could further prevent the battery stack from functioning properly.

[0028] Furthermore, the electrolyte is continuously circulated via a circulation pump. However, during the operation of the circulation pump, the pressure is not always completely stable. The rotation of the impeller in the circulation pump, as well as the air mixed in during turbulence, will cause periodic pressure fluctuations and uncertain instantaneous pressure shocks. Due to limitations in equipment or pipelines, such pressure fluctuations and instantaneous pressure shocks are unpredictable and difficult to avoid. When pressure fluctuations or instantaneous pressure shocks enter the flow battery stack, the ion exchange membrane inside the stack may suffer mechanical damage due to the instantaneous pressure shock. In severe cases, it may even lead to ion exchange membrane rupture, causing a short circuit inside the stack and resulting in failure, and affecting the service life of the flow battery.

[0029] Please refer to the following: Figure 1 and Figure 2 To address the aforementioned issues, this application provides a voltage-stabilizing filter device 30 for use in a flow battery 100. The device includes a main body 31, a filter body 32, and an elastomer 33. The main body 31 has an inner cavity 311, an inlet 312, and an outlet 313. The filter body 32 is disposed within the inner cavity 311, dividing the inner cavity 311 into a first cavity 3111 and a second cavity 3112. The inlet 312, the first cavity 3111, the second cavity 3112, and the outlet 313 are sequentially connected. The elastomer 33 is disposed within the first cavity 3111 and / or the second cavity 3112. The elastomer 33 defines, either by itself or together with the main body 31, a gas cavity 314 for filling with gas. The elastomer 33 is configured to deform when there is a pressure difference between the pressure within the gas cavity 314 and the pressure of the electrolyte flowing through the inner cavity 311, thereby regulating the electrolyte pressure.

[0030] The main body 31 mainly serves as a support and installation unit. As an example, the main body 31 can be a cuboid, a cylinder, or other shapes, which can be customized according to requirements.

[0031] As an example, filter body 32 can be a filter plate, a filter screen, or a filter structure.

[0032] As an example, the elastomer 33 may be made of elastic plastic, rubber, silicone or other materials. The elastomer 33 may define the air cavity 314 on its own, or the elastomer 33 may define the air cavity 314 together with the body 31.

[0033] As an example, at least one elastic body 33 can be provided in the first cavity 3111 or the second cavity 3112, or at least one elastic body 33 can be provided in both the first cavity 3111 and the second cavity 3112. The specific configuration can be determined according to actual needs.

[0034] Optionally, the gas chamber 314 can be filled with oxygen, nitrogen or other gases. Preferably, the gas chamber 314 is filled with an inert gas. Inert gases are chemically stable and not easily combustible, thus avoiding the risk of explosion due to high temperature during the filling process of the gas chamber 314.

[0035] In actual operation, the electrolyte enters through the inlet 312 and flows sequentially through the first chamber 3111, the filter 32, and the second chamber 3112 before exiting through the outlet 313. During the electrolyte flow through the filter 32, impurities in the electrolyte adhere to the filter 32, thus achieving the purpose of filtering the electrolyte and ensuring that the electrolyte entering the battery stack 40 is free of impurities. This solves the problem of electrolyte blockage and improves the reliability of the flow battery 100.

[0036] During the electrolyte circulation process of the flow battery 100, impurities may not be completely removed during the production process, or parts of the stack 40 may detach, causing blockage at the electrolyte inlet and affecting the inlet flow rate. This could further prevent the stack 40 from functioning properly. Therefore, the electrolyte needs to be filtered before entering the stack 40 inlet. In this application, the filter body 32 is set with a mesh size according to the required filtration precision of the flow battery 100. This allows impurities of the corresponding diameter in the electrolyte to be intercepted and prevented from passing through, ensuring the cleanliness of the electrolyte entering the stack 40. Furthermore, since the internal cross-sectional area of ​​the main body 31 of the pressure stabilizing filter device 30 is relatively large, compared to directly installing the filter structure in the pipeline 50, it is not limited by the diameter of the pipeline 50. Under the same filtration accuracy (same mesh size of filter body 32), the effective cross-sectional area of ​​the filter in the main body 31 is larger. When the electrolyte flow rate is the same, the electrolyte flow rate through the filter body 32 in the main body 31 will be lower than that in the filter structure in the pipeline 50, and the corresponding pressure loss will also be reduced, effectively reducing the power consumption of the circulating pump 20 in this part of the pressure stabilizing filter device 30.

[0037] Furthermore, before the electrolyte enters the first chamber 3111, an inert gas matching the design pressure of the flow battery 100 is pre-injected into the gas chamber 314. When the pressure in the pipeline 50 of the flow battery 100 increases instantaneously, it indicates that the instantaneous flow rate at the outlet of the circulation pump 20 increases. At this time, the electrolyte pressure is higher than the pressure in the gas chamber 314, causing the electrolyte to compress the elastomer 33, resulting in a decrease in the volume of the gas chamber 314. Since the volume of the main body 31 remains unchanged, when the volume of the gas chamber 314 decreases, the volume of the main body 31 that can hold the electrolyte relatively increases. This increased volume can be used to compensate for the increased instantaneous flow rate at the outlet of the circulation pump 20, thereby achieving the effect of stabilizing the electrolyte pressure in the pipeline 50. Similarly, when the pressure in the pipeline 50 decreases instantaneously, it indicates that the instantaneous flow rate at the outlet of the circulation pump 20 decreases. At this time, the electrolyte pressure is lower than the pressure in the gas chamber 314, and the elastomer 33 expands under the influence of the gas, causing the volume of the gas chamber 314 to increase. Since the volume of the main body 31 remains constant, when the volume of the gas chamber 314 increases, the volume of electrolyte that can be contained in the main body 31 decreases relatively, which corresponds to a decrease in the instantaneous flow rate at the outlet of the circulating pump 20, thereby achieving the effect of stabilizing the electrolyte in the pipeline 50.

[0038] In summary, the pressure stabilizing and filtering device 30 in this application has both pressure stabilizing and filtering functions. It is designed to filter impurities in the pipeline 50, regulate unstable pressure fluctuations during the operation of the flow battery 100, reduce pressure fluctuations and instantaneous pressure shocks, thereby protecting the ion exchange membrane in the stack 40, reducing the failure of the stack 40, improving operating conditions and extending the service life of the flow battery 100.

[0039] In some embodiments, the elastomer 33 is located within the second cavity 3112 and is disposed toward the filter body 32. In this way, the electrolyte filtered by the filter body 32 acts directly on the elastomer 33 along its flow direction, so that the elastomer 33 can respond quickly and deform when the pressure of the electrolyte fluctuates.

[0040] Specifically, when the electrolyte pressure in the pipeline 50 fluctuates, causing a pressure difference between the electrolyte pressure and the pressure in the gas chamber 314, the elastic body 33 compensates for the fluctuation of the electrolyte pressure by contracting and closing the volume of the gas chamber 314, or by expanding and releasing the volume of the gas chamber 314, thereby stabilizing the electrolyte pressure in the pipeline 50.

[0041] In some embodiments, the elastomer 33 is located away from the filter body 32 relative to the outlet 313. This design can reduce the interference of the elastomer 33 on the liquid outlet, ensuring that the pressure-stabilizing filter device 30 can discharge liquid smoothly.

[0042] In some embodiments, the pressure-stabilizing filter device 30 further includes an air inlet pipe 34 and a valve 35. The air inlet pipe 34 is disposed on the main body 31 and communicates with the air chamber 314, and the valve 35 is disposed on the air inlet pipe 34. When the valve 35 is open, an external air source supplies gas into the air chamber 314 so that the pressure inside the air chamber 314 can reach the design pressure matching the operation of the flow battery 100. When the valve 35 is closed, the gas is retained in the air chamber 314, and when there is a pressure difference with the electrolyte, it interacts with the electrolyte through the deformation of the elastomer 33, thereby achieving the purpose of pressure stabilization.

[0043] In some embodiments, the pressure stabilizing filter device 30 further includes a guide conductor 36, which is spaced apart at the bottom of the filter body 32 and divides the first cavity 3111 into a liquid passage cavity 3111a and a dirt collection cavity 3111b arranged sequentially along the gravity direction X. The liquid passage cavity 3111a is connected to the liquid inlet 312. The guide conductor 36 is provided with a guide hole 361 connecting the liquid passage cavity 3111a and the dirt collection cavity 3111b. The cross-sectional area of ​​the guide conductor 36 gradually decreases along the gravity direction X, and the guide hole 361 is located at the lowest position of the guide conductor 36 along the gravity direction X.

[0044] As the cross-sectional area of ​​the filter conductor 36 gradually decreases in the direction of gravity X, the wall of the filter conductor 36 is inclined downwards. When the filter body 32 intercepts impurities, the impurities settle downwards under gravity, fall onto the filter conductor 36, and then slide downwards along the inclined direction of the filter conductor 36 until they enter the bottom of the dirt collection chamber 3111b through the guide hole 361 of the filter conductor 36, which is also the bottom of the main body 31.

[0045] In this embodiment, by designing a sparse conductor 36, the sparse conductor 36 can block the space in the main body 31 where the electrolyte flows and the space where impurities are collected, and can guide impurities into the collection chamber 3111b for collection, thereby reducing the interference of impurities on the operation of the flow battery 100.

[0046] As an example, the conductor 36 includes a first plate 362 and a second plate 363, which are spliced ​​together to form a guide hole 361 at the splice. Specifically, both the first plate 362 and the second plate 363 are inclined plates spliced ​​together to form a V-shaped conductor 36, and both the first plate 362 and the second plate 363 gradually decrease in the direction from their respective ends away from the guide hole 361 to those pointing towards the guide hole 361. This design facilitates the installation and forming of the conductor 36 and simplifies its structure.

[0047] Of course, the structure of the sparse conductor 36 is not limited to the one described above. In other embodiments, the sparse conductor 36 may also be a funnel structure, etc.

[0048] In some embodiments, at least a portion of the cross-sectional area of ​​the sluice hole 361 gradually decreases in the gravitational direction X.

[0049] A conical segment 3611 is defined as the section of the guide hole 361 whose cross-sectional area gradually decreases in the gravitational direction X. The guide hole 361 may consist only of the conical segment 3611, or it may also include the conical segment 3611 and a cylindrical segment 3612, with the cylindrical segment 3612 connecting above and / or below the conical segment 3611. It is understood that the cross-sectional area of ​​the cylindrical segment 3612 is circular, and the cross-sectional area of ​​the cylindrical segment 3612 does not change in the gravitational direction X.

[0050] When the circulating pump 20 stops working, the reverse flow of the electrolyte may pull the impurities in the collection chamber 3111b upwards. However, most of the impurities will be intercepted in the collection chamber 3111b by the conductor 36. A small number of impurities will also be intercepted when they are pulled upwards by the guide hole 361 due to the obstruction of the tapered section 3611 of the guide hole 361. This effectively ensures that a large amount of impurities will not flow back into the pipeline 50 after the circulating pump 20 stops, thus preventing secondary pollution.

[0051] In some embodiments, the pressure stabilizing filter device 30 further includes an adsorption structure 37, which is disposed at the bottom of the dirt collection chamber 3111b, and the projection of the dredging hole 361 in the gravity direction X falls onto the adsorption structure 37.

[0052] As impurities accumulate in the collection chamber 3111b, some free impurities inevitably return to the pipeline 50 and clog it. By setting up the adsorption structure 37, the free impurities deposited in the collection chamber 3111b can be firmly adsorbed. Even if the circulation pump 20 stops, it is difficult for impurities to return to the pipeline 50, thus improving the reliability of the liquid battery operation.

[0053] In some embodiments, the main body 31 includes a first part 315 and a second part 316, the first part 315 and the second part 316 being detachably connected, the filter body 32, the elastomer 33 and the conductive material 36 being located within the first part 315, and the adsorption structure 37 being located within the second part 316.

[0054] It is understood that the inner wall of the first part 315 defines a portion forming the sludge collection cavity 3111b, the second cavity 3112, and the liquid passage cavity 3111a, and the inner wall of the second part 316 defines the remaining portion forming the sludge collection cavity 3111b.

[0055] As an example, the first part 315 and the second part 316 can be detachably connected by a flange structure 38, a snap-fit ​​structure, etc. Taking the flange structure 38 as an example, the flange structure 38 includes a first flange 381, a second flange 382, ​​and a plurality of bolts 383. The first part 315 passes through the central hole of the first flange 381, the second part 316 passes through the central hole of the second flange 382, ​​and the plurality of bolts 383 are arranged circumferentially along the first flange 381 and detachably connected to the first flange 381 and the second flange 382.

[0056] When the first part 315 and the second part 316 are disassembled, the adsorption structure 37 can be replaced regularly and effectively to ensure that the adsorption structure 37 has a better adsorption effect, thereby improving the stability and safety of the flow battery 100.

[0057] This application also provides a flow battery 100, which includes a storage tank 10, a circulation pump 20, a voltage stabilizing filter device 30 as described in any of the above embodiments, and a fuel cell stack 40 arranged in sequence. The outlet of the circulation pump 20 is connected to the inlet 312 of the voltage stabilizing filter device 30, and the outlet 313 of the voltage stabilizing filter device 30 is connected to the inlet of the fuel cell stack 40.

[0058] Specifically, the storage tank 10 is used to store the electrolyte, the circulation pump 20 is used to provide power and drive the electrolyte to circulate, the pressure stabilizing filter 30 is used to filter the electrolyte and regulate the pressure during the electrolyte circulation process, and the fuel cell stack 40 is used to react with the electrolyte and charge or discharge it.

[0059] Pipelines 50 connect the outlet of the storage tank 10 to the inlet of the circulation pump 20, the outlet of the circulation pump 20 to the inlet 312 of the pressure stabilizing filter device 30, the outlet 313 of the pressure stabilizing filter device 30 to the inlet of the fuel cell stack 40, and the outlet of the fuel cell stack 40 to the inlet of the storage tank 10.

[0060] By designing a pressure stabilizing filter device 30 inside the flow battery 100, (1) the impact of pressure pulsation and instantaneous impact pressure during the operation of the pipeline 50 of the flow battery 100 is greatly reduced, which is beneficial to protecting the internal structure of the stack 40 and improving the service life of the flow battery 100; (2) the pressure stabilizing and filtering structures of the flow battery 100 are integrated, avoiding the large space occupied by a single pressure stabilizing structure and a single filtering structure in the flow battery 100. Moreover, the filtration of the pressure stabilizing filter device 30 can effectively reduce pressure loss and reduce the power consumption of the circulation pump 20; (3) the situation of repeated contamination of the pipeline 50 by impurities due to the design of a filtering structure inside the pipeline 50 is greatly avoided, and the accumulation, adsorption and cleaning of impurities can be effectively completed, ensuring the cleanliness and long-term use of the flow battery 100.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A voltage-stabilizing filter device, applied to a flow battery, characterized in that, The pressure-stabilizing filter device includes: The main body (31) has an inner cavity (311), a liquid inlet (312) and a liquid outlet (313). A filter element (32) is disposed within the inner cavity (311), dividing the inner cavity (311) into a first cavity (3111) and a second cavity (3112). The inlet (312), the first cavity (3111), the second cavity (3112), and the outlet (313) are sequentially connected. An elastomer (33) is disposed within the first cavity (3111) and / or the second cavity (3112), and the elastomer (33) defines itself or the elastomer (33) and the body (31) together to form a gas cavity (314) for filling gas, and the elastomer (33) is configured to deform when there is a pressure difference between the pressure in the gas cavity (314) and the pressure of the electrolyte flowing through the inner cavity (311) to adjust the pressure of the electrolyte.

2. The pressure-stabilizing filter device according to claim 1, characterized in that, The elastomer (33) is located inside the second cavity (3112) and is positioned toward the filter (32).

3. The pressure-stabilizing filter device according to claim 2, characterized in that, The elastomer (33) is located away from the filter body (32) relative to the liquid outlet (313).

4. The pressure-stabilizing filter device according to claim 1, characterized in that, The pressure stabilizing filter also includes an air inlet pipe (34) and a valve (35). The air inlet pipe (34) is disposed on the main body (31) and communicates with the air chamber (314). The valve (35) is disposed on the air inlet pipe (34).

5. The pressure-stabilizing filter device according to claim 1, characterized in that, The pressure stabilizing filter device also includes a guide conductor (36), which is spaced apart at the bottom of the filter body (32) and divides the first cavity (3111) into a liquid passage cavity (3111a) and a dirt collection cavity (3111b) arranged sequentially along the gravity direction (X). The liquid passage cavity (3111a) is connected to the liquid inlet (312). The guide conductor (36) is provided with a guide hole (361) that connects the liquid passage cavity (3111a) and the dirt collection cavity (3111b). The cross-sectional area of ​​the guide conductor (36) gradually decreases along the gravity direction (X), and the guide hole (361) is located at the lowest position of the guide conductor (36) along the gravity direction (X).

6. The pressure-stabilizing filter device according to claim 5, characterized in that, The sparse conductor (36) includes a first plate (362) and a second plate (363), which are spliced ​​together and form the sparse hole (361) at the splice.

7. The pressure-stabilizing filter device according to claim 5, characterized in that, The cross-sectional area of ​​at least a portion of the sprue (361) gradually decreases in the direction of gravity (X).

8. The pressure-stabilizing filter device according to claim 5, characterized in that, The pressure stabilizing filter device also includes an adsorption structure (37), which is disposed at the bottom of the dirt collection chamber (3111b), and the projection of the dredging hole (361) in the direction of gravity (X) falls onto the adsorption structure (37).

9. The pressure-stabilizing filter device according to claim 8, characterized in that, The main body (31) includes a first part (315) and a second part (316), wherein the first part (315) and the second part (316) are detachably connected; The filter (32), the elastomer (33) and the conductive material (36) are all located in the first part (315), and the adsorption structure (37) is located in the second part (316).

10. A flow battery, characterized in that, The flow battery includes a storage tank (10), a circulation pump (20), a voltage stabilizing filter device as described in any one of claims 1 to 9, and a fuel cell stack (40) arranged in sequence. The outlet of the circulation pump (20) is connected to the inlet (312) of the voltage stabilizing filter device, and the outlet (313) of the voltage stabilizing filter device is connected to the inlet of the fuel cell stack (40).

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