Iron-chromium flow battery
By pre-charge and control liquid mixing during the start-up process of the iron-chromium flow battery, the problem of low starting efficiency in the prior art is solved, and a faster and more economical startup process is achieved.
Patent Information
- Application Number
- CN202421745205.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-22
AI Technical Summary
The starting efficiency of existing iron-chromium flow batteries is poor and it takes a long time to reach the optimal electrolyte temperature, resulting in an increase in startup costs.
By pre-charged during startup and controlling the state of the communication valve, the positive electrode liquid and the negative electrode liquid are mixed, thereby directly chemical reactions in the battery pack to generate heat, significantly increasing the liquid temperature.
It improves the starting efficiency of iron-chromium flow batteries, shortens the startup time, and reduces the startup cost.
Smart Images
Figure CN222927534U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of chemical energy storage, and particularly to a ferrochromium flow battery. Background Art
[0002] A flow battery belongs to a secondary energy storage battery processing technology in which active chemical substances are stored in a liquid electrolyte. Compared with other traditional ion storage batteries, the flow battery not only has differences in battery structure, but also stores energy in the positive and negative electrolyte solutions. The positive and negative electrolyte storage tanks of the flow battery are completely independently placed outside the battery stack (battery pack). Through two circulating pumps, the positive and negative electrolytes are pumped into the battery stack through pipelines and an electrochemical reaction continuously occurs, and the storage and release of electrical energy are completed through the mutual conversion of chemical energy and electrical energy. Compared with lithium-ion batteries, the flow battery has many advantages such as high safety, long cycle life, recyclable electrolyte, high cost performance in the life cycle, and environmental friendliness, and is considered to be one of the preferred technologies for large-scale energy storage technologies, with broad application prospects.
[0003] The battery efficiency of the ferrochromium flow battery is one of the key factors concerned by users. In order to make the ferrochromium flow battery system have better startup efficiency, the startup of the ferrochromium flow battery needs to operate at a certain temperature, that is, a certain temperature rise treatment is required for the electrolyte. The startup efficiency of the ferrochromium flow battery in the prior art is poor. Summary of the Utility Model
[0004] In view of this, the embodiments of this application provide a ferrochromium flow battery, which can improve the startup efficiency of the ferrochromium flow battery.
[0005] The embodiments of this application provide a ferrochromium flow battery, which includes a battery pack, a positive electrode liquid tank, a negative electrode liquid tank, a positive electrode liquid pipeline assembly, a negative electrode liquid pipeline assembly, and a connecting pipeline assembly. Among them, the positive electrode liquid tank is used to store the positive electrode liquid; the negative electrode liquid tank is used to store the negative electrode liquid; the positive electrode liquid pipeline assembly includes a positive electrode liquid inlet pipe and a positive electrode liquid return pipe, and the positive electrode liquid flows into the battery pack through the positive electrode liquid inlet pipe and flows back to the positive electrode liquid tank through the positive electrode liquid return pipe; the negative electrode liquid pipeline assembly includes a negative electrode liquid inlet pipe and a negative electrode liquid return pipe, and the negative electrode liquid flows into the battery pack through the negative electrode liquid inlet pipe and flows back to the negative electrode liquid tank through the negative electrode liquid return pipe; the connecting pipeline assembly includes a connecting pipeline and a connecting valve, and the connecting pipeline assembly connects the positive electrode liquid pipeline assembly and the negative electrode liquid pipeline assembly, or connects the positive electrode liquid tank and the negative electrode liquid tank to mix the positive electrode liquid and the negative electrode liquid.
[0006] In a possible implementation of the present application, the positive electrolyte pipeline assembly further includes a positive electrolyte delivery pump and a positive electrolyte connection valve. The positive electrolyte delivery pump is disposed on the positive electrolyte inlet pipe, and the positive electrolyte connection valve is disposed on the positive electrolyte return pipe. The negative electrolyte pipeline assembly further includes a negative electrolyte delivery pump and a negative electrolyte connection valve. The negative electrolyte delivery pump is disposed on the negative electrolyte inlet pipe, and the negative electrolyte connection valve is disposed on the negative electrolyte return pipe. The connection pipeline includes a first connection pipe, and the connection valve includes a first connection valve. The first connection valve is disposed on the first connection pipe. The first end of the first connection pipe communicates between the battery pack and the positive electrolyte connection valve. The second end of the first connection pipe communicates between the battery pack and the negative electrolyte connection valve.
[0007] In a possible implementation of the present application, both the positive electrolyte tank and the negative electrolyte tank are provided with liquid level gauges.
[0008] In a possible implementation of the present application, the positive electrolyte pipeline assembly further includes a positive electrolyte delivery pump and a positive electrolyte connection valve. The positive electrolyte delivery pump is disposed on the positive electrolyte inlet pipe, and the positive electrolyte connection valve is disposed on the positive electrolyte return pipe. The negative electrolyte pipeline assembly further includes a negative electrolyte delivery pump and a negative electrolyte connection valve. The negative electrolyte delivery pump is disposed on the negative electrolyte inlet pipe, and the negative electrolyte connection valve is disposed on the negative electrolyte return pipe. The connection pipeline includes a first connection pipe and a second connection pipe, and the connection valve includes a first connection valve and a second connection valve. The first connection valve is disposed on the first connection pipe, and the second connection valve is disposed on the second connection pipe. The first end of the first connection pipe communicates between the battery pack and the positive electrolyte connection valve. The second end of the first connection pipe communicates between the battery pack and the negative electrolyte connection valve. The first end of the second connection pipe communicates between the positive electrolyte delivery pump and the battery pack. The second end of the second connection pipe communicates between the negative electrolyte delivery pump and the battery pack.
[0009] In a possible implementation of the present application, the connection pipeline assembly further includes an overflow pipe. Both ends of the overflow pipe communicate with the upper ends of the positive electrolyte tank and the negative electrolyte tank respectively. When the positive electrolyte tank is full, the medium in the positive electrolyte tank enters the negative electrolyte tank through the overflow pipe. When the negative electrolyte tank is full, the medium in the negative electrolyte tank enters the positive electrolyte tank through the overflow pipe.
[0010] Compared with the method of directly starting the iron-chromium flow battery, as the electrolyte temperature in the iron-chromium flow battery continuously rises during the charge and discharge process, the temperature of the positive electrolyte or the negative electrolyte only slowly rises. In the iron-chromium flow battery provided by the embodiments of the present application, when starting, when the temperature of the positive electrolyte or the negative electrolyte is relatively low, by pre-charging the iron-chromium flow battery and controlling the state of the connection valve, the positive electrolyte and the negative electrolyte can be mixed, so that the positive electrolyte and the negative electrolyte can directly undergo a chemical reaction to generate heat, thereby significantly increasing the temperature of the positive electrolyte or the negative electrolyte, improving the starting efficiency of the iron-chromium flow battery, and reducing the starting cost of the iron-chromium flow battery. Brief Description of the Drawings
[0011] In order to more clearly illustrate the technical solutions of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.
[0012] The accompanying drawings herein are incorporated into the specification and form a part of this specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to explain the technical solutions of the present application.
[0013] Figure 1 It is a schematic structural diagram of a ferrochromium flow battery provided by an embodiment of the present application;
[0014] Figure 2 It is a schematic structural diagram of another ferrochromium flow battery provided by an embodiment of the present application.
[0015] Reference Signs:
[0016] 1, battery pack; 2, positive electrolyte tank; 3, negative electrolyte tank; 4, positive electrolyte pipeline assembly; 41, positive electrolyte inlet pipe; 42, positive electrolyte return pipe; 43, positive electrolyte delivery pump; 44, positive electrolyte connection valve; 5, negative electrolyte pipeline assembly; 51, negative electrolyte inlet pipe; 52, negative electrolyte return pipe; 53, negative electrolyte delivery pump; 54, negative electrolyte connection valve; 6, connection pipeline assembly; 61, connection pipeline; 611, first connection pipe; 612, second connection pipe; 62, connection valve; 621, first connection valve; 622, second connection valve; 63, overflow pipe. Detailed Embodiments
[0017] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.
[0018] During the operation of an iron-chromium flow battery, the electrolyte temperature generally can achieve a better conversion efficiency within the range of 40 to 60 °C. For the iron-chromium flow battery provided by the prior art, during the first startup after the system construction is completed, or the restart after the electrolyte cools down for a period of shutdown, the direct startup method is usually adopted. As the electrolyte temperature continuously rises during the charge and discharge process of the iron-chromium flow battery, the iron-chromium flow battery can be normally used. During this process, due to the slow heating rate of the electrolyte, it takes a long time to meet the above temperature requirements, resulting in poor startup efficiency of the iron-chromium flow battery; moreover, during this process, additional energy is consumed, increasing the startup cost of the iron-chromium flow battery.
[0019] On this basis, the embodiment of the present application provides an iron-chromium flow battery, which can improve the startup efficiency of the iron-chromium flow battery and reduce the startup cost of the iron-chromium flow battery.
[0020] Specifically, referring to Figure 1 , the iron-chromium flow battery provided by the embodiment of the present application includes a battery pack 1, a positive electrode liquid tank 2, a negative electrode liquid tank 3, a positive electrode liquid pipeline assembly 4, a negative electrode liquid pipeline assembly 5, and a communication pipeline assembly 6. Among them, the positive electrode liquid tank 2 is used to store the positive electrode liquid. The negative electrode liquid tank 3 is used to store the negative electrode liquid. The positive electrode liquid pipeline assembly 4 includes a positive electrode liquid inlet pipe 41 and a positive electrode liquid return pipe 42. The positive electrode liquid flows into the battery pack 1 through the positive electrode liquid inlet pipe 41 and returns to the positive electrode liquid tank 2 through the positive electrode liquid return pipe 42. The negative electrode liquid pipeline assembly 5 includes a negative electrode liquid inlet pipe 51 and a negative electrode liquid return pipe 52. The negative electrode liquid flows into the battery pack 1 through the negative electrode liquid inlet pipe 51 and returns to the negative electrode liquid tank 3 through the negative electrode liquid return pipe 52. The communication pipeline assembly 6 includes a communication pipeline 61 and a communication valve 62. The communication pipeline assembly 6 connects the positive electrode liquid pipeline assembly 4 and the negative electrode liquid pipeline assembly 5, or connects the positive electrode liquid tank 2 and the negative electrode liquid tank 3 to mix the positive electrode liquid and the negative electrode liquid.
[0021] It should be noted that in the embodiment of the present application, the battery pack 1 can be regarded as the battery stack of the iron-chromium flow battery; the positive electrode liquid tank 2 can be regarded as the positive electrode electrolyte storage tank, and the negative electrode liquid tank 3 can be regarded as the negative electrode electrolyte storage tank; the positive electrode liquid can be regarded as the positive electrode electrolyte, and the negative electrode liquid can be regarded as the negative electrode electrolyte.
[0022] On this basis, the positive electrode liquid and the negative electrode liquid react in the battery pack 1, and the electrical energy can be converted into chemical energy, or the chemical energy can be converted into electrical energy, so as to realize the storage or release of energy.
[0023] Furthermore, referring to Figure 1 , the positive electrode liquid pipeline assembly 4 includes a positive electrode liquid inlet pipe 41 and a positive electrode liquid return pipe 42. In addition, the positive electrode liquid pipeline assembly 4 may also include other structural components, such as, it may include a circulation pump or a valve, etc.
[0024] Specifically, referring to Figure 1 , in the embodiment of the present application, the positive electrolyte inlet pipe 41 can be connected between the lower end of the positive electrolyte tank 2 and the lower end of the battery pack 1, and the positive electrolyte return pipe 42 can be connected between the upper end of the battery pack 1 and the upper end of the positive electrolyte tank 2.
[0025] In addition, referring to Figure 1 , the negative electrolyte pipeline assembly 5 includes a negative electrolyte inlet pipe 51 and a negative electrolyte return pipe 52. In addition, the negative electrolyte pipeline assembly 5 may further include other structural components, such as, it may include a circulation pump or a valve, etc.
[0026] Specifically, referring to Figure 1 , in the embodiment of the present application, the negative electrolyte inlet pipe 51 can be connected between the lower end of the negative electrolyte tank 3 and the upper end of the battery pack 1, and the negative electrolyte return pipe 52 can be connected between the upper end of the battery pack 1 and the upper end of the negative electrolyte pipe.
[0027] On this basis, referring to Figure 1 , the iron-chromium flow battery provided by the embodiment of the present application further includes a communication pipeline assembly 6. Specifically, the communication pipeline assembly 6 includes a communication pipeline 61 and a communication valve 62. By arranging the communication pipeline assembly 6 to connect the positive electrolyte pipeline assembly 4 and the negative electrolyte pipeline assembly 5, or to connect the positive electrolyte tank 2 or the negative electrolyte tank 3, the positive electrolyte and the negative electrolyte can be mixed, so that the positive electrolyte and the negative electrolyte can directly react, and the temperature of the medium in the positive electrolyte tank 2 or the negative electrolyte tank 3 can be rapidly increased.
[0028] It should be noted that, in the embodiment of the present application, the communication pipeline assembly 6 may include a plurality of pipelines and a plurality of valves to form the communication pipeline 61 and the communication valve 62. And, by appropriately setting the communication position of the communication pipeline assembly 6, the communication pipeline assembly 6 can connect the positive electrolyte pipeline assembly 4 and the negative electrolyte pipeline assembly 5, or connect the positive electrolyte tank 2 and the negative electrolyte tank 3. In this way, the positive electrolyte and the negative electrolyte can be mixed by using the communication pipeline assembly 6.
[0029] Compared with the direct start-up method in the related art, as the temperature of the electrolyte in the iron-chromium flow battery rises continuously during the charge and discharge process, the temperature of the positive electrolyte or the negative electrolyte only rises slowly. For the iron-chromium flow battery provided by the embodiment of the present application, at the start-up time, when the temperature of the positive electrolyte or the negative electrolyte is relatively low, by controlling the state of the communication valve 62 and combining the states of other structural components, such as the circulation pump, the positive electrolyte and the negative electrolyte can be mixed, so that the positive electrolyte and the negative electrolyte can directly undergo a chemical reaction to generate heat, thereby significantly increasing the temperature of the positive electrolyte or the negative electrolyte, and thus improving the start-up efficiency of the iron-chromium flow battery and reducing the start-up cost of the iron-chromium flow battery.
[0030] It should be noted that, in the embodiments of the present application, the positive electrolyte and the negative electrolyte can be used in an iron-chromium flow battery with a porous membrane as a separator. Exemplarily, in some embodiments of the present application, the molar ratio of chromium chloride: ferrous chloride: complexing agent: buffer: hydrochloric acid in the negative electrolyte is 0.8:0.8:2.5:0.3:0.01; and the molar ratio of chromium chloride: ferrous chloride: complexing agent: buffer: hydrochloric acid in the positive electrolyte is 0.8:0.8:2.5:0.3:0.4.
[0031] On this basis, referring to Figure 1 , in some embodiments of the present application, the positive electrolyte pipeline assembly 4 further includes a positive electrolyte delivery pump 43 and a positive electrolyte connection valve 44. The positive electrolyte delivery pump 43 is arranged on the positive electrolyte inlet pipe 41, and the positive electrolyte connection valve 44 is arranged on the positive electrolyte return pipe 42. The negative electrolyte pipeline assembly 5 further includes a negative electrolyte delivery pump 53 and a negative electrolyte connection valve 54. The negative electrolyte delivery pump 53 is arranged on the negative electrolyte inlet pipe 51, and the negative electrolyte connection valve 54 is arranged on the negative electrolyte return pipe 52. The connection pipeline 61 includes a first connection pipe 611, and the connection valve 62 includes a first connection valve 621. The first connection valve 621 is arranged on the first connection pipe 611; the first end of the first connection pipe 611 is connected between the battery pack 1 and the positive electrolyte connection valve 44; the second end of the first connection pipe 611 is connected between the battery pack 1 and the negative electrolyte connection valve 54.
[0032] Specifically, referring to Figure 1 , in the embodiments of the present application, the positive electrolyte delivery pump 43 is used for the circulation of the positive electrolyte. When the positive electrolyte delivery pump 43 is operating, it can deliver the positive electrolyte in the positive electrolyte tank 2 into the battery pack 1 for reaction, and then the positive electrolyte flows back to the positive electrolyte tank 2 through the positive electrolyte return pipe 42. The negative electrolyte delivery pump 53 is used for the circulation of the negative electrolyte. When the negative electrolyte delivery pump 53 is operating, it can deliver the negative electrolyte in the negative electrolyte tank 3 into the battery pack 1 for reaction, and then the negative electrolyte flows back to the negative electrolyte tank 3 through the negative electrolyte return pipe 52.
[0033] It should be noted that, in the embodiments of the present application, the specific forms of the positive electrolyte connection valve 44 and the negative electrolyte connection valve 54 are not limited. Exemplarily, the positive electrolyte connection valve 44 and the negative electrolyte connection valve 54 can be set as manual valves, electric valves or pneumatic valves, etc. Specifically, in some embodiments of the present application, the positive electrolyte connection valve 44 and the negative electrolyte connection valve 54 can be set as solenoid valves.
[0034] In addition, in the embodiments of the present application, the first connection pipe 611 is used to connect the positive electrolyte pipeline assembly 4 and the negative electrolyte pipeline assembly 5, and there are various connection methods that can achieve the above purpose.
[0035] On this basis, referring to Figure 1 , the mixing of the positive electrolyte and the negative electrolyte is described.
[0036] When it is necessary to transport the positive electrolyte to the negative electrolyte tank 3 for mixing with the negative electrolyte, the positive electrolyte delivery pump 43 can be controlled to be in an operating state, the positive electrolyte connection valve 44 can be controlled to be in a closed state, the first connection valve 621 can be controlled to be in an open state, the negative electrolyte delivery pump 53 can be controlled to be in an operating state, and the negative electrolyte connection valve 54 can be controlled to be in an open state. In this way, the positive electrolyte can enter the negative electrolyte tank 3 through the positive electrolyte delivery pump 43, the battery pack 1, the positive electrolyte return pipe 42, the first connection pipe 611, the first connection valve 621, the negative electrolyte return pipe 52, and the negative electrolyte connection valve 54 for mixing with the negative electrolyte.
[0037] When it is necessary to transport the negative electrolyte to the positive electrolyte tank 2 for mixing with the positive electrolyte, the positive electrolyte delivery pump 43 can be controlled to be in an operating state, the positive electrolyte connection valve 44 can be controlled to be in an open state, the first connection valve 621 can be controlled to be in an open state, the negative electrolyte delivery pump 53 can be controlled to be in an operating state, and the negative electrolyte connection valve 54 can be controlled to be in a closed state. In this way, the negative electrolyte can enter the positive electrolyte tank 2 through the negative electrolyte delivery pump 53, the battery pack 1, the negative electrolyte return pipe 52, the first connection pipe 611, the first connection valve 621, the positive electrolyte return pipe 42, and the positive electrolyte connection valve 44 for mixing with the positive electrolyte.
[0038] Furthermore, in the embodiment of the present application, referring to the above description, transporting the positive electrolyte to the negative electrolyte tank 3 for mixing with the negative electrolyte and transporting the negative electrolyte to the positive electrolyte tank 2 for mixing with the positive electrolyte can be alternately performed until the temperature of the positive electrolyte or the negative electrolyte reaches a preset requirement, such as making the temperature of the positive electrolyte or the negative electrolyte be 40 to 60 °C.
[0039] On this basis, in some embodiments of the present application, both the positive electrolyte tank 2 and the negative electrolyte tank 3 are provided with liquid level gauges.
[0040] It should be noted that in the embodiment of the present application, the above-mentioned liquid level gauge can be used to observe the liquid level in the positive electrolyte tank 2 or the negative electrolyte tank 3. Thus, when mixing the positive electrolyte and the negative electrolyte, the mixing progress of the positive electrolyte and the negative electrolyte can be conveniently controlled according to the liquid level of the positive electrolyte tank 2 or the negative electrolyte tank 3 to prevent the positive electrolyte tank 2 or the negative electrolyte tank 3 from being full of liquid.
[0041] On this basis, referring to Figure 2, in some embodiments of the present application, the connecting pipeline 61 includes a first connecting pipe 611 and a second connecting pipe 612, and the connecting valve 62 includes a first connecting valve 621 and a second connecting valve 622. The first connecting valve 621 is arranged on the first connecting pipe 611, and the second connecting valve 622 is arranged on the second connecting pipe 612. The first end of the first connecting pipe 611 is connected between the battery pack 1 and the positive electrolyte connecting valve 44, and the second end of the first connecting pipe 611 is connected between the battery pack 1 and the negative electrolyte connecting valve 54; the first end of the second connecting pipe 612 is connected between the positive electrolyte delivery pump 43 and the battery pack 1, and the second end of the second connecting pipe 612 is connected between the negative electrolyte delivery pump 53 and the battery pack 1.
[0042] On this basis, with reference to Figure 2 , the mixing of the positive electrolyte and the negative electrolyte will be described.
[0043] When it is necessary to deliver the positive electrolyte to the negative electrolyte tank 3 for mixing with the negative electrolyte, the positive electrolyte delivery pump 43 can be controlled to be in an operating state, the positive electrolyte connecting valve 44 can be controlled to be in a closed state, the first connecting valve 621 can be controlled to be in an open state, the second connecting valve 622 can be controlled to be in a closed state, the negative electrolyte delivery pump 53 can be controlled to be in an operating state, and the negative electrolyte connecting valve 54 can be controlled to be in an open state. In this way, the positive electrolyte can enter the negative electrolyte tank 3 through the positive electrolyte delivery pump 43, the first connecting valve 621, and the negative electrolyte connecting valve 54 for mixing with the negative electrolyte. After the positive electrolyte is delivered to the negative electrolyte tank 3 for mixing with the negative electrolyte, the liquid level of the negative electrolyte tank 3 is higher than that of the positive electrolyte tank 2. After the mixing of the positive electrolyte and the negative electrolyte is completed, the second connecting valve 622 can be controlled to be in an open state. Under the action of gravity, the liquid in the negative electrolyte tank 3 can enter the positive electrolyte tank 2 through the second connecting pipe 612 and the second connecting valve 622, so that the liquid levels of the positive electrolyte tank 2 and the negative electrolyte tank 3 can be balanced.
[0044] When it is necessary to deliver the negative electrolyte to the positive electrolyte tank 2 for mixing with the positive electrolyte, the positive electrolyte delivery pump 43 can be controlled to be in an operating state, the positive electrolyte connecting valve 44 can be controlled to be in an open state, the first connecting valve 621 can be controlled to be in an open state, the second connecting valve 622 can be controlled to be in a closed state, the negative electrolyte delivery pump 53 can be controlled to be in an operating state, and the negative electrolyte connecting valve 54 can be controlled to be in a closed state. In this way, the negative electrolyte can enter the positive electrolyte tank 2 through the negative electrolyte delivery pump 53, the first connecting valve 621, and the positive electrolyte connecting valve 44 for mixing with the positive electrolyte. After the negative electrolyte is delivered to the positive electrolyte tank 2 for mixing with the positive electrolyte, the liquid level of the positive electrolyte tank 2 is higher than that of the negative electrolyte tank 3. After the mixing of the positive electrolyte and the negative electrolyte is completed, the second connecting valve 622 can be controlled to be in an open state. Under the action of gravity, the liquid in the positive electrolyte tank 2 can enter the negative electrolyte tank 3 through the second connecting pipe 612 and the second connecting valve 622, so that the liquid levels of the positive electrolyte tank 2 and the negative electrolyte tank 3 can be balanced.
[0045] On this basis, with reference to Figure 2 , in the iron-chromium flow battery provided in the embodiment of the present application, the communication pipeline assembly 6 further includes an overflow pipe 63, and both ends of the overflow pipe 63 are respectively communicated with the upper ends of the positive liquid tank 2 and the negative liquid tank 3.
[0046] By providing the overflow pipe 63, when the positive liquid is transported to the negative liquid tank 3 for mixing with the negative liquid or the negative liquid is transported to the positive liquid tank 2 for mixing with the positive liquid, it is possible to overflow the liquid in the positive liquid tank 2 to the negative liquid tank 3 when the positive liquid tank 2 is full; or overflow the liquid in the negative liquid tank 3 to the positive liquid tank 2 when the negative liquid tank 3 is full.
[0047] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the magnitude of the serial numbers of the above steps / processes does not mean the order of execution, and the order of execution of each step / process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The serial numbers of the embodiments of the present application above are only for description and do not represent the advantages and disadvantages of the embodiments.
[0048] It should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.
[0049] The above is only the implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should be covered within the protection scope of the present application.
Claims
1. An iron-chromium flow battery, characterized in that: include: Battery pack; A cathode liquid tank, used for storing cathode liquid; A cathode liquid tank, used for storing cathode liquid; A cathode liquid pipeline assembly, comprising a cathode liquid inlet pipe and a cathode liquid return pipe, wherein the cathode liquid flows into the battery pack through the cathode liquid inlet pipe and flows back to the cathode liquid tank through the cathode liquid return pipe; A cathode liquid pipeline assembly, comprising an cathode liquid inlet pipe and an cathode liquid return pipe, wherein the cathode liquid flows into the battery pack through the cathode liquid inlet pipe and flows back to the cathode liquid tank through the cathode liquid return pipe; The connecting pipeline assembly includes a connecting pipeline and a connecting valve. The connecting pipeline assembly connects the positive electrode liquid pipeline assembly with the negative electrode liquid pipeline assembly, or connects the positive electrode liquid tank with the negative electrode liquid tank to mix the positive electrode liquid with the negative electrode liquid.
2. The iron-chromium flow battery according to claim 1, characterized in that: The cathode liquid pipeline assembly further includes a cathode liquid delivery pump and a cathode liquid communication valve, wherein the cathode liquid delivery pump is arranged on the cathode liquid inlet pipe, and the cathode liquid communication valve is arranged on the cathode liquid return pipe; The negative electrode liquid pipeline assembly further includes a negative electrode liquid delivery pump and a negative electrode liquid communication valve, wherein the negative electrode liquid delivery pump is arranged on the negative electrode liquid inlet pipe, and the negative electrode liquid communication valve is arranged on the negative electrode liquid return pipe; The communication pipeline includes a first communication pipe, the communication valve includes a first communication valve, and the first communication valve is arranged on the first communication pipe; The first end of the first connecting pipe is connected between the battery pack and the cathode liquid connecting valve; The second end of the first communication pipe is connected between the battery pack and the negative electrode liquid communication valve.
3. The iron-chromium flow battery according to claim 2, characterized in that: The positive electrode liquid tank and the negative electrode liquid tank are both provided with liquid level gauges.
4. The iron-chromium flow battery according to claim 1, characterized in that: The cathode liquid pipeline assembly further includes a cathode liquid delivery pump and a cathode liquid communication valve, wherein the cathode liquid delivery pump is arranged on the cathode liquid inlet pipe, and the cathode liquid communication valve is arranged on the cathode liquid return pipe; The negative electrode liquid pipeline assembly further includes a negative electrode liquid delivery pump and a negative electrode liquid communication valve, wherein the negative electrode liquid delivery pump is arranged on the negative electrode liquid inlet pipe, and the negative electrode liquid communication valve is arranged on the negative electrode liquid return pipe; The communication pipeline includes a first communication pipe and a second communication pipe, and the communication valve includes a first communication valve and a second communication valve, the first communication valve is arranged in the first communication pipe, and the second communication valve is arranged in the second communication pipe; The first end of the first connecting pipe is connected between the battery pack and the cathode liquid connecting valve, and the second end of the first connecting pipe is connected between the battery pack and the cathode liquid connecting valve; The first end of the second connecting pipe is connected between the positive electrode liquid delivery pump and the battery pack, and the second end of the second connecting pipe is connected between the negative electrode liquid delivery pump and the battery pack.
5. The iron-chromium flow battery according to claim 1, characterized in that: The connecting pipeline assembly further includes an overflow pipe, and two ends of the overflow pipe are respectively connected to the upper end of the positive electrode liquid tank and the upper end of the negative electrode liquid tank; When the cathode liquid tank is full, the medium in the cathode liquid tank enters the cathode liquid tank through the overflow pipe; when the cathode liquid tank is full, the medium in the cathode liquid tank enters the cathode liquid tank through the overflow pipe.