Vanadium redox flow battery system and processing method of residual electric quantity thereof

Abstract

The invention relates to a vanadium redox flow battery system and a processing method of residual electricity of the vanadium redox flow battery system. The vanadium redox flow battery system comprises a replacement box, an electric pile, a circulation pipeline, a cooling device and a controller. The replacement box is filled with electrified liquid, and the electrified liquid is subjected to a replacement reaction in the replacement box. The electric pile is provided with an inlet and an outlet; the inlet and the outlet are respectively connected with the replacement box through a circulating pipeline. And the circulating pipeline is used for circularly conveying the electric liquid between the replacement box and the electric pile. The cooling device is connected with the replacement box and used for cooling the electrified liquid in the replacement box. The controller is electrically connected with the replacement box, the electric pile and the circulation pipeline, and the controller is configured to control the cooling device to be started when the temperature of the electrified liquid is higher than a first preset value; and when the temperature of the electrified liquid is lower than a second preset value, the cooling device is controlled to be closed. According to the embodiment of the invention, the residual charged liquid in the galvanic pile can be effectively treated, local overheating of the galvanic pile is avoided, and the service life of the galvanic pile is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of energy storage, and in particular to a vanadium liquid flow battery system and a method for processing residual power thereof. Background Art

[0002] Among the many liquid flow battery technologies, vanadium liquid flow battery technology is the most mature. This battery has the characteristics of long cycle life, good safety, and modular design, making it one of the preferred technologies for large-scale and efficient energy storage technology.

[0003] When the vanadium flow battery system stops running, some electrolyte will remain in the battery stack and cannot be discharged. Since the electrolyte is a carrier for storing electricity, it is considered a charged liquid. The residual charged liquid will self-discharge and release energy, causing local overheating in the confined space inside the battery stack, causing the performance of the battery stack to deteriorate.

[0004] Therefore, how to effectively deal with the residual charged liquid in the battery stack and avoid local overheating of the battery stack is an urgent problem that needs to be solved. Summary of the invention

[0005] Based on this, the embodiment of the present application provides a vanadium liquid flow battery system and a method for processing the residual power thereof, which can effectively process the residual charged liquid in the battery stack, avoid local overheating of the battery stack, and thus extend the life of the battery stack.

[0006] In order to achieve the above-mentioned objectives, in a first aspect, some embodiments of the present application provide a vanadium liquid flow battery system, comprising: a replacement box, a battery stack, a circulation pipeline, a cooling device and a controller. The replacement box is filled with a charged liquid, and the charged liquid undergoes a replacement reaction in the replacement box. The battery stack is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the replacement box through a circulation pipeline. The circulation pipeline is used to circulate the charged liquid between the replacement box and the battery stack. The cooling device is connected to the replacement box, and the cooling device is used to cool the charged liquid in the replacement box. The controller is electrically connected to the replacement box, the battery stack and the circulation pipeline, and the controller is configured to: when the temperature of the charged liquid is higher than a first preset value, control the cooling device to turn on; when the temperature of the charged liquid is lower than a second preset value, control the cooling device to turn off.

[0007] In some embodiments of the present application, the circulation pipeline is provided with a circulation pump; the controller is also configured to: after the cooling device is turned off, the charged liquid continues to circulate in the replacement box, and when the temperature of the charged liquid no longer increases, the circulation pump is turned off.

[0008] In some embodiments of the present application, the duration of the replacement cycle ranges from 1 min to 1000 min.

[0009] In some embodiments of the present application, the range of the first preset value includes: 40°C~60°C; the range of the second preset value includes: 5°C~35°C.

[0010] In some embodiments of the present application, the inlet and the outlet are also respectively connected to the main circulation system for normal operation of the battery.

[0011] In some embodiments of the present application, the vanadium liquid flow battery system further includes: a temperature probe. The temperature probe is inserted into the charged liquid and is used to collect the temperature of the charged liquid in real time.

[0012] In a second aspect, some embodiments of the present application further provide a method for processing the remaining power of a vanadium liquid flow battery system, comprising the following steps:

[0013] When the temperature of the charged liquid is higher than a first preset value, the cooling device is controlled to turn on;

[0014] When the temperature of the charged liquid is lower than a second preset value, the cooling device is controlled to be closed.

[0015] Among them, the cooling device is connected to the replacement box, and the cooling device is used to cool the charged liquid in the replacement box; the battery stack is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the replacement box through a circulation pipeline; the circulation pipeline circulates the charged liquid between the replacement box and the battery stack.

[0016] In some embodiments of the present application, the method for processing the remaining power of the vanadium liquid flow battery system further includes: using a temperature probe to collect the temperature of the charged liquid in real time.

[0017] In some embodiments of the present application, after controlling the cooling device to be turned off, the method further includes:

[0018] The charged liquid continues to be replaced and circulated in the replacement box, and when the temperature of the charged liquid no longer increases, the circulation pump is turned off. The circulation pump is arranged on the circulation pipeline.

[0019] In some embodiments of the present application, the duration of the replacement cycle ranges from 1 min to 1000 min.

[0020] The vanadium liquid flow battery system and the method for processing the residual power thereof provided in the present application can / at least have the following advantages:

[0021] In the embodiment of the present application, a replacement box and a circulation pipeline are added to the vanadium liquid flow battery system, the replacement box is connected to the battery stack through the circulation pipeline, and the replacement box is connected to a cooling device. In this way, the embodiment of the present application uses a replacement cycle to pass the residual charged liquid in the battery stack into the replacement box through the circulation pipeline. The residual charged liquid undergoes a replacement reaction in the replacement box, releasing the electricity in the replacement box, causing the charged liquid in the replacement box to heat up, and then the heat is dissipated by the cooling device. In this way, after the charged liquid in the battery stack passes through the replacement cycle, the residual electricity of the charged liquid in the battery stack is replaced, and at the same time, the charged liquid in the replacement box is cooled by the cooling device, thereby solving the problem of heating of the battery stack and life attenuation caused by the self-discharge of the vanadium liquid flow battery system, and further reducing the overall cost and failure risk rate.

[0022] In addition, the embodiments of the present application use replacement cycle heat dissipation to ensure that the internal temperature of the battery is always maintained near the operating temperature, and will not cause a small amount of charged liquid in the battery stack to precipitate and fail due to excessive temperature.

[0023] Furthermore, in the embodiment of the present application, the temperature probe goes deep into the charged liquid. In this way, the temperature probe can collect the temperature of the charged liquid in real time. When the temperature probe detects that the temperature of the charged liquid is higher than the first preset value, the controller controls the cooling device to turn on, and the cooling device cools down the charged liquid in the battery stack; when the temperature probe detects that the temperature of the charged liquid is lower than the second preset value, the controller controls the cooling device to turn off. In this way, the embodiment of the present application uses the temperature probe to further improve the accuracy of the heat dissipation of the displacement cycle in the vanadium liquid flow battery system.

[0024] Furthermore, in the embodiment of the present application, after the cooling device is turned off, the charged liquid continues to be replaced and circulated in the replacement box. When the temperature of the charged liquid no longer rises, it means that all the charged liquid has been replaced, and the controller controls the circulation pump to turn off. In this way, after the charged liquid in the battery stack passes through the replacement cycle, the problem of battery stack heating and life attenuation caused by self-discharge of the vanadium liquid flow battery system is further avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic structural diagram of a vanadium liquid flow battery system provided in one embodiment of the present application;

[0027] Figure 2This is a schematic structural diagram of another vanadium liquid flow battery system provided in one embodiment of the present application;

[0028] Figure 3 A control logic diagram of another vanadium liquid flow battery system provided in an embodiment of the present application;

[0029] Figure 4 This is a flow chart of a temperature control method for a vanadium liquid flow battery system provided in one embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1-replacement box; 2-cell stack; 21-inlet; 211-positive electrode inlet; 212-negative electrode inlet; 22-outlet; 221-positive electrode outlet; 222-negative electrode outlet; 3-circulation pipeline; 31-positive electrode circulation pump; 32-negative electrode circulation pump; 4-cooling device; 5-temperature probe; 6-controller. DETAILED DESCRIPTION

[0032] In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. Embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0034] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0035] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0036] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that when the terms "consisting of" and / or "comprising" are used in this specification, the presence of the features, integers, steps, operations, elements and / or parts can be determined, but the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups is not excluded. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0037] Embodiments of the invention are described herein with reference to cross-sectional views which are schematic diagrams of ideal embodiments (and intermediate structures) of the invention, such that variations in the shapes shown due to, for example, manufacturing techniques and / or tolerances are anticipated. Thus, embodiments of the invention should not be limited to the particular shapes of the regions shown herein, but rather include deviations in shapes due to, for example, manufacturing techniques. For example, an implanted region shown as a rectangle typically has rounded or curved features and / or an implant concentration gradient at its edges rather than a binary change from an implanted region to a non-implanted region. Similarly, a buried region formed by implantation may result in some implantation in the region between the buried region and the surface through which the implantation is performed. Thus, the regions shown in the figures are schematic in nature, their shapes do not represent the actual shape of the region of the device, and do not limit the scope of the invention.

[0038] Among the many liquid flow battery technologies, vanadium liquid flow battery technology is the most mature. This battery has the characteristics of long cycle life, good safety, and modular design, making it one of the preferred technologies for large-scale and efficient energy storage technology.

[0039] The storage and discharge process of vanadium flow batteries is essentially the process of the change of the valence state of vanadium ions. When the vanadium battery system stores electricity, the vanadium ions in the vanadium electrolyte gradually change from 3- and 4-valent states to 2- and 5-valent states. When the vanadium flow battery releases electricity, the vanadium ions in the vanadium electrolyte gradually change from 2- and 5-valent states to 3- and 4-valent states. When the battery is running, the electrolyte will enter the battery stack from the positive and negative electrolyte tanks through the circulation pipeline, charge and discharge will occur in the battery stack, and then return to the positive and negative tanks, forming a cycle. When the storage is completed and the system is on standby, a part of the electrolyte will remain in the battery stack and cannot be discharged. At this time, if the system has just completed the storage of electricity, a part of the electrolyte remaining in the battery stack is a charged liquid (the electrolyte is the carrier of electricity storage), and there is a problem of residual electricity in the battery stack.

[0040] Since the residual electricity in the battery stack is the vanadium ions that cannot coexist in the electrolyte of the positive and negative electrode chambers, they will self-discharge during the storage process, releasing energy during self-discharge, causing local overheating in the enclosed space inside the battery stack, resulting in the precipitation of pentavalent vanadium. On the one hand, it will block the battery stack and make the liquid flow of the electrode material inside the chamber unevenly distributed, and at the same time cause uneven distribution of the electric field, deteriorating the performance of the battery stack; on the other hand, the local temperature is too high, causing thermal damage to the materials in the battery stack, resulting in a serious shortening of the service life of the battery stack.

[0041] At present, in the field of vanadium flow batteries, there is basically no operation to replace the remaining power. Most of them use the drainage device to drain the remaining electrolyte in the battery stack as much as possible, reduce the self-discharge and heat release, and reduce the degree of damage to the battery stack. However, the battery stack cannot avoid long-term damage accumulation, which will still reduce the life of the battery stack. Therefore, how to effectively deal with the residual charged liquid in the battery stack and avoid local overheating of the battery stack is an urgent problem to be solved.

[0042] Based on this, the embodiment of the present application provides a vanadium liquid flow battery system and a method for processing the residual power thereof, which can effectively process the residual charged liquid in the battery stack, avoid local overheating of the battery stack, and thus extend the life of the battery stack.

[0043] See also Figure 1 Some embodiments of the present application provide a vanadium liquid flow battery system, including: a replacement box 1, a battery stack 2, a circulation pipeline 3, a cooling device 4 and a controller ( Figure 1). The replacement box 1 is filled with charged liquid, and the charged liquid undergoes a replacement reaction in the replacement box. The battery stack 2 is provided with an inlet 21 and an outlet 22, and the inlet 21 and the outlet 22 are respectively connected to the replacement box 1 through a circulation pipeline 3. The circulation pipeline 3 is used to circulate the charged liquid between the replacement box 1 and the battery stack 2. The cooling device 4 is connected to the replacement box 1, and the cooling device 4 is used to cool the charged liquid in the replacement box 1. The controller is electrically connected to the replacement box 1, the battery stack 2 and the circulation pipeline 3, and the controller is configured to: when the temperature of the charged liquid is higher than a first preset value, control the cooling device 4 to turn on; when the temperature of the charged liquid is lower than a second preset value, control the cooling device 4 to turn off.

[0044] In the embodiment of the present application, a replacement box 1 and a circulation pipeline 3 are added to the vanadium liquid flow battery system, and the replacement box 1 is connected to the battery stack 2 through the circulation pipeline 3, and the replacement box 1 is connected to the cooling device 4. In this way, the embodiment of the present application uses the circulation pipeline 3 to pass the residual charged liquid in the battery stack 2 into the replacement box 1 through the replacement cycle. The residual charged liquid undergoes a replacement reaction in the replacement box 1, and releases the electricity in the replacement box 1, so that the charged liquid in the replacement box 1 heats up, and then the heat is dissipated by the cooling device 4. In this way, after the charged liquid in the battery stack 2 passes through the replacement cycle, the residual electricity of the charged liquid in the battery stack 2 is replaced, and at the same time, the charged liquid in the replacement box 1 is cooled by the cooling device 4, thereby solving the problem of battery stack heating and life attenuation caused by self-discharge of the vanadium liquid flow battery system, and further reducing the overall cost and failure risk rate.

[0045] In addition, the embodiment of the present application dissipates heat through a replacement cycle, thereby ensuring that the internal temperature of the battery is always maintained near the operating temperature, and will not cause a small amount of charged liquid in the battery stack 2 to precipitate and fail due to excessive temperature.

[0046] In some embodiments, see Figure 2 , the circulation pipeline 3 is provided with a circulation pump. The circulation pump includes: a positive electrode circulation pump 31 and a negative electrode circulation pump 32. The controller ( Figure 2 (not shown) is further configured as follows: after the cooling device 4 is turned off, the charged liquid continues to circulate in the replacement box 1, and when the temperature of the charged liquid no longer increases, the circulation pump is turned off.

[0047] In the embodiment of the present application, after the cooling device 4 is turned off, the charged liquid continues to be replaced and circulated in the replacement box 1. When the temperature of the charged liquid no longer rises, it means that all the charged liquid has been replaced, and the controller controls the circulation pump to be turned off. In this way, after the charged liquid in the battery stack 2 passes through the replacement cycle, the problem of heating of the battery stack 2 and life attenuation caused by the self-discharge of the vanadium liquid flow battery system is further avoided.

[0048] In some examples, the cooling device 4 is connected to the displacement tank 1 through a pipeline.

[0049] In some examples, the displacement box 1 can be in various shapes such as square, round or conical.

[0050] For example, the liquid in the replacement tank 1 may be a raw electrolyte solution, or may be an electrolyte solution to which a retarder is added in the replacement tank 1 .

[0051] In some examples, the circulation pipeline 3 can be long or short, thick or thin. Here, the embodiment of the present application does not limit the length and thickness of the circulation pipeline 3.

[0052] In some examples, stack 2 is all the stacks operated by the system.

[0053] In some examples, the cooling device 4 includes: an air cooling device, a water cooling device, a mixed cooling device, or a condensing device using condensate, etc.

[0054] In some examples, the inlet 21 and the outlet 22 of the fuel cell stack 2 are connected to the main circulation system and the replacement circulation subsystem, respectively.

[0055] For example, the number of the replacement cycle subsystems includes 1 or more. The multiple replacement cycle subsystems are connected in series and parallel, and correspond to the multiple fuel cell stacks 2.

[0056] In some embodiments, the duration of the replacement cycle ranges from 1 min to 1000 min. For example, the duration of the replacement cycle can be 1 min, 10 min, 20 min, 30 min, 40 min, 50 min, 100 min, 200 min, 300 min, 400 min, 500 min, 600 min, 700 min, 800 min, 900 min or 1000 min, etc.

[0057] In some embodiments, the first preset value ranges from 40° C. to 60° C. For example, the first preset value may be 40° C., 42° C., 44° C., 46° C., 48° C., 50° C., 52° C., 54° C., 56° C., 58° C., or 60° C., etc.

[0058] In some embodiments, the second preset value ranges from 5° C. to 35° C. For example, the second preset value may be 5° C., 7° C., 9° C., 11° C., 13° C., 15° C., 17° C., 19° C., 21° C., 23° C., 25° C., 27° C., 29° C., 31° C., 33° C., or 35° C., etc.

[0059] In some embodiments, please refer to Figure 2The inlet and outlet are also connected to the main circulation system of the normal operation of the battery. Among them, the inlet includes the positive electrode inlet 211 and the negative electrode inlet 212. The outlet includes the positive electrode outlet 221 and the negative electrode outlet 222. The inlet and outlet are respectively connected to the main circulation system of the normal operation of the vanadium battery and the sub-circulation system D that can replace the remaining electricity.

[0060] In some embodiments, the vanadium flow battery system further comprises: a temperature probe ( Figure 2 The temperature probe is inserted into the charged liquid, and is used to collect the temperature of the charged liquid in real time.

[0061] In the embodiment of the present application, the temperature probe goes deep into the charged liquid. In this way, the temperature probe can collect the temperature of the charged liquid in real time. When the temperature probe detects that the temperature of the charged liquid is higher than the first preset value, the controller controls the cooling device to turn on, and the cooling device 4 cools down the charged liquid in the battery stack 2; when the temperature probe detects that the temperature of the charged liquid is lower than the second preset value, the controller 6 controls the cooling device 4 to turn off. In this way, the embodiment of the present application uses the temperature probe to further improve the accuracy of the heat dissipation of the displacement cycle in the vanadium liquid flow battery system.

[0062] For some examples, see Figure 2 and Figure 3 When the vanadium liquid flow battery stops working, the controller 6 issues a command to close valves a, c, e, and g, and to open valves b, d, f, and h, and to start the positive electrode circulation pump 31 and the negative electrode circulation pump 32 of the stack at the same time. The replacement liquid in the replacement box 1 is pumped into the positive and negative electrode chambers of the stack through the positive and negative electrode liquid inlet circulation sub-pipelines D3 and D4, and then flows back to the replacement box 1 through the positive and negative electrode liquid outlet circulation sub-pipelines D1 and D2. The remaining electricity is replaced in the replacement box 1, causing the temperature of the replacement box 1 to rise. When the temperature of the replacement box 1 exceeds the first preset value (for example, 45°C), the temperature information is fed back to the controller 6, and the controller 6 issues a command to the cooling device 4, and the cooling device 4 starts to cool down. When the temperature drops to the second preset value (for example, room temperature), the cooling device 4 is turned off. After the cooling device 4 is turned off, the replacement circulation system continues to run. After about 1min to 1000min of the replacement cycle, when the temperature of the replacement box no longer rises, it is judged that the replacement is completed, and the controller 6 issues a command to shut down the replacement subsystem, so that the positive electrode circulation pump 31 and the negative electrode circulation pump 32 of the battery stack are closed, valves b, valve d, valve f, and valve h are closed, and valves a, valve c, valve e, and valve g are opened.

[0063] See also Figure 4 Some embodiments of the present application also provide a method for processing the remaining power of a vanadium liquid flow battery system, including steps S100 to S200.

[0064] S100, when the temperature of the charged liquid is higher than a first preset value, the cooling device is controlled to turn on.

[0065] S200, when the temperature of the charged liquid is lower than a second preset value, the cooling device is controlled to be turned off.

[0066] Among them, the cooling device 4 is connected to the replacement box 1, and the cooling device 4 is used to cool the charged liquid in the replacement box 1; the battery stack 2 is provided with an inlet 21 and an outlet 22, and the inlet 21 and the outlet 22 are respectively connected to the replacement box 1 through a circulation pipeline 3; the circulation pipeline 3 circulates the charged liquid between the replacement box 1 and the battery stack.

[0067] In the embodiment of the present application, the residual charged liquid in the battery stack 2 is passed into the replacement box 1 by means of a replacement cycle using the circulation pipeline 3. The residual charged liquid undergoes a replacement reaction in the replacement box 1, releasing the electricity in the replacement box 1, causing the charged liquid in the replacement box 1 to heat up, and then the heat is dissipated by the cooling device 4. In this way, after the charged liquid in the battery stack 2 passes through the replacement cycle, the residual electricity of the charged liquid in the battery stack 2 is replaced, and at the same time, the charged liquid in the replacement box 1 is cooled by the cooling device 4, thereby solving the problem of battery stack heating and life attenuation caused by self-discharge of the vanadium liquid flow battery system, and further reducing the overall cost and failure risk rate.

[0068] In addition, the embodiment of the present application dissipates heat through a replacement cycle, thereby ensuring that the internal temperature of the battery is always maintained near the operating temperature, and will not cause a small amount of charged liquid in the battery stack 2 to precipitate and fail due to excessive temperature.

[0069] In some embodiments, the method for processing the remaining power of the vanadium liquid flow battery system further includes: using a temperature probe to collect the temperature of the charged liquid in real time.

[0070] In some embodiments, after controlling the cooling device 4 to be turned off, the method further includes:

[0071] The charged liquid continues to be replaced and circulated in the replacement box 1 , and when the temperature of the charged liquid no longer increases, the circulation pump is turned off. The circulation pump is arranged on the circulation pipeline 3 .

[0072] In the embodiment of the present application, after the cooling device 4 is turned off, the charged liquid continues to be replaced and circulated in the replacement box 1. When the temperature of the charged liquid no longer rises, it means that all the charged liquid has been replaced, and the controller controls the circulation pump to be turned off. In this way, after the charged liquid in the battery stack 2 passes through the replacement cycle, the problem of heating of the battery stack 2 and life attenuation caused by the self-discharge of the vanadium liquid flow battery system is further avoided.

[0073] In some embodiments, the duration of the replacement cycle ranges from 1 min to 1000 min. For example, the duration of the replacement cycle can be 1 min, 10 min, 20 min, 30 min, 40 min, 50 min, 100 min, 200 min, 300 min, 400 min, 500 min, 600 min, 700 min, 800 min, 900 min or 1000 min, etc.

[0074] In some embodiments, the first preset value ranges from 40° C. to 60° C. For example, the first preset value may be 40° C., 42° C., 44° C., 46° C., 48° C., 50° C., 52° C., 54° C., 56° C., 58° C., or 60° C., etc.

[0075] In some embodiments, the second preset value ranges from 5° C. to 35° C. For example, the second preset value may be 5° C., 7° C., 9° C., 11° C., 13° C., 15° C., 17° C., 19° C., 21° C., 23° C., 25° C., 27° C., 29° C., 31° C., 33° C., or 35° C.

[0076] In some examples, the displacement box 1 can be in various shapes such as square, round or conical.

[0077] For example, the liquid in the replacement tank 1 may be a raw electrolyte solution, or may be an electrolyte solution to which a retarder is added in the replacement tank 1 .

[0078] In some examples, the circulation pipeline 3 can be long or short, thick or thin. Here, the embodiment of the present application does not limit the length and thickness of the circulation pipeline 3.

[0079] In some examples, stack 2 is all the stacks operated by the system.

[0080] In some examples, the cooling device 4 includes: an air cooling device, a water cooling device, a mixed cooling device, or a condensing device using condensate, etc.

[0081] In some examples, the inlet 21 and the outlet 22 of the fuel cell stack 2 are connected to the main circulation system and the replacement circulation subsystem, respectively.

[0082] For example, the number of the replacement cycle subsystems includes 1 or more. The multiple replacement cycle subsystems are connected in series and parallel, and correspond to the multiple fuel cell stacks 2.

[0083] In the description of this specification, the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features of the above-mentioned 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.

[0084] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood 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 disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A vanadium liquid flow battery system, characterized in that: include: A displacement box containing a charged liquid, wherein the charged liquid undergoes a displacement reaction in the displacement box; The battery stack is provided with an inlet and an outlet, wherein the inlet and the outlet are respectively connected to the replacement box through a circulation pipeline; A circulation pipeline, used for circulating the charged liquid between the replacement box and the battery stack; a cooling device connected to the replacement box, the cooling device being used to cool the charged liquid in the replacement box; A controller is electrically connected to the replacement box, the battery stack and the circulation pipeline. The controller is configured to: when the temperature of the charged liquid is higher than a first preset value, control the cooling device to turn on; when the temperature of the charged liquid is lower than a second preset value, control the cooling device to turn off.

2. The vanadium liquid flow battery system according to claim 1, characterized in that: The circulation pipeline is provided with a circulation pump; the controller is further configured to: after the cooling device is turned off, the charged liquid continues to circulate in the displacement box, and when the temperature of the charged liquid no longer increases, turn off the circulation pump.

3. The vanadium liquid flow battery system according to claim 2, characterized in that: The duration of the replacement cycle ranges from 1 min to 1000 min.

4. The vanadium liquid flow battery system according to claim 1, characterized in that: The range of the first preset value includes: 40°C~60°C; the range of the second preset value includes: 5°C~35°C.

5. The vanadium flow battery system according to claim 1, characterized in that: The inlet and the outlet are also respectively connected to the main circulation system of the normal operation of the battery.

6. The vanadium liquid flow battery system according to claim 1, characterized in that: Also includes: A temperature probe is inserted into the charged liquid and is used to collect the temperature of the charged liquid in real time.

7. A method for processing the residual power of a vanadium liquid flow battery system, characterized in that: include: When the temperature of the charged liquid is higher than a first preset value, the cooling device is controlled to turn on; When the temperature of the charged liquid is lower than a second preset value, controlling the cooling device to be turned off; Wherein, the cooling device is connected to the replacement box, and the cooling device is used to cool the charged liquid in the replacement box; the battery stack is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the replacement box through a circulation pipeline; the circulation pipeline is used to circulate the charged liquid between the replacement box and the battery stack.

8. The method for processing the residual power of the vanadium liquid flow battery system according to claim 7, characterized in that: Also includes: A temperature probe is used to collect the temperature of the charged liquid in real time.

9. The method for processing the residual power of a vanadium liquid flow battery system according to claim 7, characterized in that: After controlling the cooling device to be turned off, the method further includes: The charged liquid continues to circulate in the displacement box, and when the temperature of the charged liquid no longer increases, the circulation pump is turned off; wherein the circulation pump is arranged on the circulation pipeline.

10. The method for processing the remaining power of a vanadium liquid flow battery system according to claim 9, characterized in that: The duration of the replacement cycle ranges from 1 min to 1000 min.

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