Vanadium redox flow battery system and temperature control method thereof

Abstract

The invention relates to a vanadium redox flow battery system and a temperature control method thereof. The vanadium redox flow battery system comprises an electrolyte box, a circulating pipeline, an electric pile, a heating module and a controller, wherein the circulating pipeline is provided with a circulating pump, and the circulating pump is used for circularly conveying the electrolyte through the circulating pipeline. The electric pile is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected with the electrolyte box through a circulating pipeline. And the heating module is arranged on the outer surface of the electrolyte tank or in the electrolyte tank and is used for heating the electrolyte in the electrolyte tank. The controller is electrically connected with the electric pile, the heating module and the circulating pump, and the controller is configured to control the heating module and the circulating pump to be started when the temperature in the electric pile is lower than a first preset value; when the temperature in the electric pile is higher than a second preset value, the heating module and the circulating pump are controlled to be closed. According to the embodiment of the invention, low-temperature starting of the vanadium redox flow battery can be realized, so that continuous and efficient operation of the all-vanadium redox flow battery is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and in particular to a vanadium liquid flow battery system and a temperature control method 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] The charging and discharging process of vanadium flow battery is the redox reaction process of vanadium ions. However, when the temperature is too low, the fluidity of aqueous battery becomes poor, the movement of ions slows down, and almost stops, causing the all-vanadium flow battery to face the problem of difficulty in starting at low temperature. In addition, low temperature will also cause certain damage to the internal materials of the battery stack.

[0004] Therefore, how to achieve low-temperature startup of vanadium flow batteries is an urgent problem to be solved. Summary of the invention

[0005] Based on this, the embodiments of the present application provide a vanadium liquid flow battery system and a temperature control method thereof, which can achieve low-temperature start-up of the vanadium liquid flow battery, thereby ensuring continuous and efficient operation of the all-vanadium liquid flow battery.

[0006] In order to achieve the above-mentioned purpose, in the first aspect, some embodiments of the present application provide a vanadium flow battery system, including: an electrolyte tank, a circulation pipeline, a stack, a heating module and a controller. Among them, the circulation pipeline is provided with a circulation pump, and the circulation pump is used to circulate the electrolyte through the circulation pipeline. The stack is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the electrolyte tank through the circulation pipeline. The heating module is arranged on the outer surface of the electrolyte tank or inside the electrolyte tank, and the heating module is used to heat the electrolyte in the electrolyte tank. The controller is electrically connected to the stack, the heating module and the circulation pump, and the controller is configured to: when the temperature in the stack is lower than the first preset value, control the heating module and the circulation pump to turn on; when the temperature in the stack is higher than the second preset value, control the heating module and the circulation pump to turn off.

[0007] In some embodiments of the present application, the vanadium flow battery system further includes: a temperature probe. The temperature probe is disposed inside the battery stack or outside the battery stack and is electrically connected to the controller; the temperature probe is used to collect the temperature inside the battery stack in real time.

[0008] In some embodiments of the present application, when the temperature in the battery stack is higher than a second preset value, controlling the heating module and the circulating pump to shut down includes:

[0009] When the temperature in the battery stack is higher than a second preset value and lasts for more than a preset time, the heating module and the circulation pump are controlled to be turned off.

[0010] In some embodiments of the present application, the range of the first preset value includes: 0° C. to 15° C. The range of the second preset value includes: 25° C. to 45° C. The range of the preset time includes: 1 min to 15 min.

[0011] In some embodiments of the present application, the number of electrolyte tanks includes 1 or more.

[0012] In some embodiments of the present application, the inlet includes: a positive electrode inlet and a negative electrode inlet. The outlet includes: a positive electrode outlet and a negative electrode outlet. The electrolyte tank includes a positive electrode electrolyte tank and a negative electrode electrolyte tank. The positive electrode inlet and the positive electrode outlet are connected to the positive electrode electrolyte tank through a circulation pipeline respectively. The negative electrode inlet and the negative electrode outlet are connected to the negative electrode electrolyte tank through a circulation pipeline respectively.

[0013] In a second aspect, some embodiments of the present application further provide a temperature control method for a vanadium liquid flow battery system, comprising the following steps:

[0014] When the temperature in the battery stack is lower than a first preset value, the controller controls the heating module and the circulation pump to start;

[0015] When the temperature in the battery stack is higher than a second preset value, the controller controls the heating module and the circulation pump to turn off.

[0016] The heating module is arranged on the outer surface of the electrolyte tank or inside the electrolyte tank to heat the electrolyte in the electrolyte tank. The battery stack is provided with an inlet and an outlet, which are respectively connected to the electrolyte tank through a circulation pipeline. The circulation pump is arranged on the circulation pipeline, and the circulation pump is used to circulate the electrolyte through the circulation pipeline.

[0017] In some embodiments of the present application, the temperature control method of the vanadium liquid flow battery system further includes: using a temperature probe to collect the temperature inside the battery stack in real time.

[0018] In some embodiments of the present application, when the temperature in the battery stack is higher than a second preset value, controlling the heating module and the circulating pump to shut down includes:

[0019] When the temperature in the battery stack is higher than a second preset value and lasts for more than a preset time, the heating module and the circulation pump are controlled to be turned off.

[0020] In some embodiments of the present application, the number of electrolyte tanks includes 1 or more.

[0021] The vanadium liquid flow battery system and the temperature control method thereof provided in the present application can / at least have the following advantages:

[0022] In the embodiment of the present application, a heating module is arranged on the outer surface of the electrolyte tank or inside the electrolyte tank, and the electrolyte tank is connected to the battery stack through a circulation pipeline, and a circulation pump is installed in the circulation pipeline. In this way, when the temperature in the battery stack is lower than the first preset value, the controller controls the heating module and the circulation pump to turn on, and the electrolyte in the electrolyte tank is circulated and heated by the heating module and the circulation pipeline; when the temperature in the battery stack is higher than the second preset value, that is, when the temperature in the battery stack is maintained at room temperature, the controller controls the heating module and the circulation pump to turn off. In this way, the embodiment of the present application maintains the internal temperature of the battery stack at room temperature through a circulation heating control method, thereby solving the problem of long low-temperature startup time and realizing low-temperature startup of the vanadium liquid flow battery.

[0023] Furthermore, in an embodiment of the present application, a temperature probe is provided inside or outside the battery stack. In this way, the temperature probe can collect the temperature inside the battery stack in real time. When the temperature probe detects that the electrolyte temperature inside the battery stack is low, the controller controls the start of the heating module and the circulation pump, and the circulation heating starts; when the temperature probe detects that the temperature inside the battery stack rises to room temperature and stabilizes, the controller controls the shutdown of the heating module and the circulation pump, and the circulation heating stops. In this way, the embodiment of the present application uses the temperature probe to further improve the accuracy of the circulation heating in the vanadium liquid flow battery system.

[0024] In addition, the embodiment of the present application maintains the internal temperature of the battery stack at room temperature through a cyclic heating control method, and can also avoid damage to the internal parts of the battery stack (for example, the battery stack diaphragm and electrode materials) due to cold condensation of the electrolyte, thereby increasing the service life of the battery stack. In this way, a reasonable heating system configuration prolongs the service life of the vanadium liquid flow battery system and reduces the overall cost and failure risk rate. 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 2 This is a schematic structural diagram of another vanadium liquid flow battery system provided in one embodiment of the present application;

[0028] Figure 3 This is a schematic structural diagram of another vanadium liquid flow battery system provided in an embodiment of the present application;

[0029] Figure 4A control logic diagram of a vanadium liquid flow battery system provided in one embodiment of the present application;

[0030] Figure 5 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.

[0031] Description of reference numerals:

[0032] 1-electrolyte tank; 11-positive electrode electrolyte tank; 12-negative electrode electrolyte tank; 2-circulation pipeline; 21-circulation pump; 211-positive electrode circulation pump; 212-negative electrode circulation pump; 3-cell stack; 31-inlet; 311-positive electrode inlet; 312-negative electrode inlet; 32-outlet; 321-positive electrode outlet; 322-negative electrode outlet; 4-heating module; 5-temperature probe; 6-controller. DETAILED DESCRIPTION

[0033] 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.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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 specific 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.

[0039] 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.

[0040] The charging and discharging process of vanadium flow battery is the process of electrolyte redox between the positive and negative electrodes of the battery stack. When the battery is charged, the 4-valent vanadium ions in the electrolyte are oxidized in the positive electrode chamber, lose electrons and become 5-valent, and an oxidation reaction occurs. In the negative electrode chamber, the 3-valent vanadium ions in the electrolyte are reduced, gain electrons and become 2-valent, and a reduction reaction occurs. When discharging, it is just the opposite. In the positive electrode chamber, the 5-valent vanadium ions in the electrolyte are reduced, gain electrons and become 4-valent, and a reduction reaction occurs. In the negative electrode chamber, the 2-valent vanadium ions in the electrolyte are oxidized, lose electrons and become 3-valent, and an oxidation reaction occurs. Therefore, the redox reaction between different vanadium ions in the electrolyte completes the charge and discharge of electricity. However, when the temperature is too low, the fluidity of the aqueous battery deteriorates, the movement of ions slows down, and almost stops. Therefore, in the cold winter, especially in the northern region, vanadium flow batteries, as large energy storage batteries, are generally outdoors, and face the problem of difficulty in starting. In addition, low temperature will cause certain damage to the internal materials of the battery stack. Therefore, how to achieve low-temperature startup of vanadium flow batteries is an urgent problem to be solved.

[0041] Based on this, the embodiments of the present application provide a vanadium liquid flow battery system and a temperature control method thereof, which can realize low-temperature start-up of the vanadium liquid flow battery, thereby ensuring continuous and efficient operation of the all-vanadium liquid flow battery.

[0042] See also Figure 1 Some embodiments of the present application provide a vanadium liquid flow battery system, including: an electrolyte tank 1, a circulation pipeline 2, a battery stack 3, a heating module 4 and a controller ( Figure 1 ). The circulation pipeline 2 is provided with a circulation pump 21, and the circulation pump 21 is used to circulate the electrolyte through the circulation pipeline 2. The battery stack 3 is provided with an inlet 31 and an outlet 32, and the inlet 31 and the outlet 32 ​​are respectively connected to the electrolyte tank 1 through the circulation pipeline 2. The heating module 4 is arranged on the outer surface of the electrolyte tank 1 or inside the electrolyte tank 1, and the heating module 4 is used to heat the electrolyte in the electrolyte tank 1. The controller is electrically connected to the battery stack 3, the heating module 4 and the circulation pump 21, and the controller is configured to: when the temperature in the battery stack 3 is lower than the first preset value, control the heating module 4 and the circulation pump 21 to turn on; when the temperature in the battery stack 3 is higher than the second preset value, control the heating module 4 and the circulation pump 21 to turn off.

[0043] In the embodiment of the present application, a heating module 4 is arranged on the outer surface of the electrolyte tank 1 or inside the electrolyte tank 1, and the electrolyte tank 1 is connected to the battery stack 3 through a circulation pipe 2, and a circulation pump 21 is installed in the circulation pipe 2. In this way, when the temperature in the battery stack 3 is lower than the first preset value, the controller controls the heating module 4 and the circulation pump 21 to turn on, and the electrolyte in the electrolyte tank 1 is circulated and heated by the heating module 4 and the circulation pipe 2; when the temperature in the battery stack 3 is higher than the second preset value, that is, when the temperature in the battery stack 3 is maintained at room temperature, the controller controls the heating module 4 and the circulation pump 21 to turn off. In this way, the embodiment of the present application maintains the internal temperature of the battery stack 3 at room temperature through a circulation heating control method, thereby solving the problem of long low-temperature startup time and realizing low-temperature startup of the vanadium liquid flow battery.

[0044] In addition, the embodiment of the present application maintains the internal temperature of the battery stack 3 at room temperature through a cyclic heating control method, and can also avoid damage to the inside of the battery stack 3 (for example, the battery stack diaphragm and electrode materials) due to cold condensation of the electrolyte, thereby increasing the service life of the battery stack 3. In this way, a reasonable heating system configuration prolongs the service life of the vanadium liquid flow battery system and reduces the overall cost and failure risk rate.

[0045] In some embodiments, see Figure 2 The vanadium liquid flow battery system further includes: a temperature probe 5. The temperature probe 5 is arranged inside the battery stack 3 or outside the battery stack 3 and is connected to the controller ( Figure 2 The temperature probe 5 is used to collect the temperature inside the battery stack 3 in real time.

[0046] In the embodiment of the present application, a temperature probe 5 is arranged inside the battery stack 3 or outside the battery stack 3. In this way, the temperature probe 5 can collect the temperature inside the battery stack 3 in real time. When the temperature probe 5 detects that the electrolyte temperature inside the battery stack 3 is low, the controller controls the start of the heating module 4 and the circulation pump 21, and the circulation heating starts; when the temperature probe detects that the temperature inside the battery stack 3 rises to room temperature and stabilizes, the controller controls the shutdown of the heating module 4 and the circulation pump 21, and the circulation heating stops. In this way, the embodiment of the present application uses the temperature probe 5 to further improve the accuracy of the circulation heating in the vanadium liquid flow battery system.

[0047] In some examples, the temperature probe 5 may be disposed in the internal chamber of the fuel cell stack 3 or in the outlet 32 ​​of the fuel cell stack 3 .

[0048] In some embodiments, the number of electrolyte tanks 1 includes one or more.

[0049] In some examples, the inlet 31 and the outlet 32 ​​of the fuel cell stack 3 are connected to the main circulation system and the circulation heating subsystem respectively.

[0050] For example, the number of the circulating heating subsystems includes one or more. The multiple circulating heating subsystems are connected in series and parallel, and correspond to the multiple fuel cell stacks 3.

[0051] In some embodiments, when the temperature in the battery stack 3 is higher than a second preset value, controlling the heating module 4 and the circulating pump 21 to shut down includes:

[0052] When the temperature in the fuel cell stack 3 is higher than the second preset value and lasts for more than a preset time, the heating module 4 and the circulation pump 21 are controlled to be turned off.

[0053] In some embodiments, the first preset value ranges from 0°C to 15°C. For example, the first preset value may be 0°C, 2°C, 5°C, 7°C, 9°C, 11°C, 13°C or 15°C, etc. That is, the lowest temperature for the heating module 4 to start heating is 0°C.

[0054] In some embodiments, the second preset value ranges from 25°C to 45°C. For example, the second preset value may be 25°C, 27°C, 29°C, 31°C, 33°C, 35°C, 37°C, 39°C, 41°C, 43°C or 45°C, etc. That is, the maximum temperature heated by the heating module 4 is up to 45°C.

[0055] In some embodiments, the preset time ranges from 1 min to 15 min. For example, the preset time may be 1 min, 2 min, 5 min, 7 min, 9 min, 11 min, 13 min or 15 min, etc.

[0056] In some examples, the electrolyte tank 1 can be in various shapes such as square, round or conical.

[0057] For example, the liquid in the electrolyte tank 1 may be a raw electrolyte solution or an electrolyte in a main circulation system.

[0058] In some examples, the circulation pipeline 2 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 2.

[0059] In some examples, stack 3 is all the stacks operated by the system.

[0060] In some examples, the heating module 4 includes: a heating rod or a heating wire, etc.

[0061] In some embodiments, see Figure 3The inlet 31 includes: a positive electrode inlet 311 and a negative electrode inlet 312. The outlet 32 ​​includes: a positive electrode outlet 321 and a negative electrode outlet 322. The electrolyte tank 1 includes a positive electrode electrolyte tank 11 and a negative electrode electrolyte tank 12. The positive electrode inlet 311 and the positive electrode outlet 321 are connected to the positive electrode electrolyte tank 11 through a circulation pipeline 2, respectively. The negative electrode inlet 312 and the negative electrode outlet 322 are connected to the negative electrode electrolyte tank 12 through a circulation pipeline 2, respectively.

[0062] In some embodiments, please refer to Figure 3 , D3 of the circulation line 2 is provided with a positive electrode circulation pump 211, and D4 of the circulation line 2 is provided with a negative electrode circulation pump 212. The positive electrode inlet 311, the negative electrode inlet 312, the positive electrode outlet 321 and the negative electrode outlet 322 of the fuel cell stack 3 are respectively connected to the main circulation system and the circulation heating subsystem. A temperature probe 5 is installed at the positive and negative electrode outlets of the fuel cell stack, respectively. The temperature probe 5 is arranged on the positive electrode outlet 321 and the negative electrode outlet 322 of the fuel cell stack 3 to detect the temperature inside the fuel cell stack. Heating modules 4 are respectively installed on the outer surface or inside of the positive electrode electrolyte tank 11 and the negative electrode electrolyte tank 12. Circulation pumps 21 are respectively installed in D3 and D4 in the circulation line 2. When the main circulation system of the vanadium battery stops working, valves a, b, e and f are closed, and valves c, d, g and h are opened. Please refer to Figure 4 When the temperature is displayed as low, the controller 6 receives the temperature information transmitted by the temperature probe 5 and makes a judgment. When the temperature is lower than the first preset value (for example, 5°C), the controller 6 transmits an instruction to the heating module 4, the heating is turned on, and the circulation pump 21 is started. When the temperature received from the temperature probe 5 is higher than the second preset value (for example, 25°C) and lasts for more than a preset time (for example, 5 minutes), the controller 6 sends an instruction to turn off the heating module 4 and the circulation pump 21.

[0063] Furthermore, in some examples, when the circulation pump 21 is turned on, the electrolytes in the positive electrode electrolyte tank 11 and the negative electrode electrolyte tank 12 are transported to the battery stack 3 through D1 and D2 of the circulation pipeline 2, and then returned to the positive electrode electrolyte tank 11 and the negative electrode electrolyte tank 12 respectively through D3 and D4 of the circulation pipeline 2. In this way, after continuous circulation for a period of time, all the low-temperature liquid in the battery stack 3 is heated to room temperature liquid, so that the temperature in the battery stack 3 is increased, and the battery stack 3 maintains a good activation state and is ready for use at any time.

[0064] See also Figure 5 Some embodiments of the present application also provide a temperature control method for a vanadium liquid flow battery system, including steps S100 to S200.

[0065] S100, when the temperature in the battery stack is lower than a first preset value, the controller controls the heating module and the circulation pump to turn on.

[0066] S200, when the temperature in the fuel cell stack is higher than a second preset value, the controller controls the heating module and the circulation pump to be turned off.

[0067] Among them, see Figure 1 The heating module 4 is arranged on the outer surface of the electrolyte tank 1 or inside the electrolyte tank 1, and is used to heat the electrolyte in the electrolyte tank 1. The battery stack 3 is provided with an inlet 31 and an outlet 32, and the inlet 31 and the outlet 32 ​​are respectively connected to the electrolyte tank 1 through the circulation pipeline 2. The circulation pump 21 is arranged on the circulation pipeline 2, and the circulation pump 21 is used to circulate and transport the electrolyte through the circulation pipeline 2.

[0068] In the embodiment of the present application, when the temperature in the battery stack 3 is lower than the first preset value, the controller controls the heating module 4 and the circulation pump 21 to turn on, and the electrolyte in the electrolyte tank 1 is circulated and heated by the heating module 4 and the circulation pipeline 2; when the temperature in the battery stack 3 is higher than the second preset value, that is, when the temperature in the battery stack 3 is kept at room temperature, the controller controls the heating module 4 and the circulation pump 21 to turn off. In this way, the embodiment of the present application maintains the internal temperature of the battery stack 3 at room temperature through a cyclic heating control method, thereby solving the problem of long low-temperature startup time and realizing low-temperature startup of the vanadium liquid flow battery.

[0069] In addition, the embodiment of the present application maintains the internal temperature of the battery stack 3 at room temperature through a cyclic heating control method, and can also avoid damage to the inside of the battery stack 3 (for example, the battery stack diaphragm and electrode materials) due to cold condensation of the electrolyte, thereby increasing the service life of the battery stack 3. In this way, a reasonable heating system configuration prolongs the service life of the vanadium liquid flow battery system and reduces the overall cost and failure risk rate.

[0070] In some embodiments, the temperature control method of the vanadium liquid flow battery system further includes: using a temperature probe 5 to collect the temperature inside the battery stack 3 in real time.

[0071] In the embodiment of the present application, a temperature probe 5 is arranged inside the battery stack 3 or outside the battery stack 3. In this way, the temperature probe 5 can collect the temperature inside the battery stack 3 in real time. When the temperature probe 5 detects that the electrolyte temperature inside the battery stack 3 is low, the controller controls the start of the heating module 4 and the circulation pump 21, and the circulation heating starts; when the temperature probe detects that the temperature inside the battery stack 3 rises to room temperature and stabilizes, the controller controls the shutdown of the heating module 4 and the circulation pump 21, and the circulation heating stops. In this way, the embodiment of the present application uses the temperature probe 5 to further improve the accuracy of the circulation heating in the vanadium liquid flow battery system.

[0072] In some embodiments, when the temperature in the battery stack 3 is higher than a second preset value, controlling the heating module 4 and the circulating pump 21 to shut down includes:

[0073] When the temperature in the fuel cell stack 3 is higher than the second preset value and lasts for more than a preset time, the heating module 4 and the circulation pump 21 are controlled to be turned off.

[0074] In some examples, the temperature probe 5 may be disposed in the internal chamber of the fuel cell stack 3 or in the outlet 32 ​​of the fuel cell stack 3 .

[0075] In some embodiments, the number of electrolyte tanks 1 includes one or more.

[0076] In some examples, the inlet 31 and the outlet 32 ​​of the fuel cell stack 3 are connected to the main circulation system and the circulation heating subsystem respectively.

[0077] For example, the number of the circulating heating subsystems includes one or more. The multiple circulating heating subsystems are connected in series and parallel, and correspond to the multiple fuel cell stacks 3.

[0078] In some embodiments, the first preset value ranges from 0°C to 15°C. For example, the first preset value may be 0°C, 2°C, 5°C, 7°C, 9°C, 11°C, 13°C or 15°C, etc. That is, the lowest temperature for the heating module 4 to start heating is 0°C.

[0079] In some embodiments, the second preset value ranges from 25°C to 45°C. For example, the second preset value may be 25°C, 27°C, 29°C, 31°C, 33°C, 35°C, 37°C, 39°C, 41°C, 43°C or 45°C, etc. That is, the maximum temperature heated by the heating module 4 is up to 45°C.

[0080] In some embodiments, the preset time ranges from 1 min to 15 min. For example, the preset time may be 1 min, 2 min, 5 min, 7 min, 9 min, 11 min, 13 min or 15 min, etc.

[0081] In some examples, the electrolyte tank 1 can be in various shapes such as square, round or conical.

[0082] For example, the liquid in the electrolyte tank 1 may be a raw electrolyte solution or an electrolyte in a main circulation system.

[0083] In some examples, the circulation pipeline 2 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 2.

[0084] In some examples, stack 3 is all the stacks operating in the system.

[0085] In some examples, the heating module 4 includes: a heating rod or a heating wire, etc.

[0086] 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.

[0087] 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: Electrolyte tank; A circulation pipeline is provided with a circulation pump, and the circulation pump is used to circulate the electrolyte through the circulation pipeline; The battery stack is provided with an inlet and an outlet, wherein the inlet and the outlet are respectively connected to the electrolyte tank through the circulation pipeline; A heating module, disposed on the outer surface of the electrolyte tank or inside the electrolyte tank, and used to heat the electrolyte in the electrolyte tank; A controller is electrically connected to the battery stack, the heating module and the circulating pump, and is configured to: when the temperature in the battery stack is lower than a first preset value, control the heating module and the circulating pump to turn on; when the temperature in the battery stack is higher than a second preset value, control the heating module and the circulating pump to turn off.

2. The vanadium liquid flow battery system according to claim 1, characterized in that: Also includes: A temperature probe is arranged inside the battery stack or outside the battery stack and is electrically connected to the controller; the temperature probe is used to collect the temperature inside the battery stack in real time.

3. The vanadium liquid flow battery system according to claim 1, characterized in that: When the temperature in the battery stack is higher than a second preset value, controlling the heating module and the circulating pump to shut down includes: When the temperature in the battery stack is higher than the second preset value and lasts for more than a preset time, the heating module and the circulation pump are controlled to be turned off.

4. The vanadium liquid flow battery system according to claim 3, characterized in that: The range of the first preset value includes: 0°C~15°C; the range of the second preset value includes: 25°C~45°C; the range of the preset time includes: 1min~15min.

5. The vanadium flow battery system according to claim 1, characterized in that: The number of the electrolyte tanks includes one or more.

6. The vanadium liquid flow battery system according to claim 1, characterized in that: The inlet includes: a positive electrode inlet and a negative electrode inlet; the outlet includes: a positive electrode outlet and a negative electrode outlet; the electrolyte tank includes a positive electrode electrolyte tank and a negative electrode electrolyte tank; The positive electrode inlet and the positive electrode outlet are respectively connected to the positive electrode electrolyte tank through circulation pipelines; The negative electrode inlet and the negative electrode outlet are connected to the negative electrode electrolyte tank through circulation pipelines respectively.

7. A temperature control method for a vanadium liquid flow battery system, characterized in that: include: When the temperature in the battery stack is lower than a first preset value, the controller controls the heating module and the circulation pump to start; When the temperature in the battery stack is higher than a second preset value, the controller controls the heating module and the circulation pump to be turned off; Among them, the heating module is arranged on the outer surface of the electrolyte tank or inside the electrolyte tank, and is used to heat the electrolyte in the electrolyte tank; the battery stack is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the electrolyte tank through a circulation pipeline; the circulation pump is arranged on the circulation pipeline, and the circulation pump is used to circulate the electrolyte through the circulation pipeline.

8. The temperature control method of the vanadium flow battery system according to claim 7, characterized in that: Also includes: A temperature probe is used to collect the temperature inside the battery stack in real time.

9. The temperature control method of the vanadium flow battery system according to claim 7, characterized in that: When the temperature in the battery stack is higher than a second preset value, controlling the heating module and the circulating pump to shut down includes: When the temperature in the battery stack is higher than the second preset value and lasts for more than a preset time, the heating module and the circulation pump are controlled to be turned off.

10. The temperature control method of the vanadium flow battery system according to claim 7, characterized in that: The number of the electrolyte tanks includes one or more.

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