Product-grade flow battery multi-cabin liquid storage device and use method

Abstract

The invention provides a product-grade flow battery multi-cabin liquid storage device and a use method, and relates to the technical field of flow batteries, the flow battery multi-cabin liquid storage device comprises a liquid storage system, and the liquid storage system comprises a storage tank body; a liquid outlet control piece, a liquid return control piece and a liquid level sensor are arranged on the storage tank body; the circulating pump is connected with the electric pile and the liquid outlet control piece through a pipeline; and the liquid return control piece is connected with the electric pile through a pipeline. According to the invention, efficient circulation and accurate control of the electrolyte are realized, so that the efficiency, the performance and the stability of the flow battery are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flow batteries, and in particular to a product-level liquid flow battery multi-chamber liquid storage device and a use method thereof. Background Art

[0002] In traditional flow battery systems, the positive and negative electrolytes are stored in a tank system, and the reacted electrolyte will directly mix with the unreacted electrolyte in the tank, causing the concentration of active substances in the electrolyte entering the battery stack to change all the time. This inconsistency causes a difference in the state of charge between the electrolyte in the battery system and the electrolyte in the tank, which affects the performance and efficiency of the battery and is not conducive to the flow control of the pump.

[0003] Liquid flow batteries are limited in performance when operating at high current density for a long time. The design of large storage tanks has difficulties in maintaining the uniformity of electrolyte output and the concentration of active substances, so it is impossible to ensure that the battery can operate stably for a long time in a high current density environment. For MW-level and GW-level energy storage systems, the impact of the defects of the existing storage tank system on battery efficiency cannot be ignored.

[0004] Traditional flow battery systems are relatively complex due to the need to separate and manage positive and negative electrolytes. In addition, the storage tanks used in existing flow batteries are large, which makes it difficult to transport the electrolyte. This defect also limits the application of flow batteries in mobile or distributed energy storage systems, reducing their flexibility and portability. This increases manufacturing costs, maintenance costs, and operational difficulties, which may hinder their widespread application. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a product-level liquid flow battery multi-compartment liquid storage device and a use method, which realizes efficient and continuous charging and discharging of the liquid flow battery, improves the stability of the battery system, and reduces manufacturing costs, maintenance costs and operating difficulties.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] In a first aspect, a product-level liquid flow battery multi-chamber liquid storage device comprises:

[0008] A liquid storage system, wherein the liquid storage system comprises a plurality of storage tank bodies; the storage tank bodies are provided with a liquid outlet control component, a liquid return control component and a liquid level sensor;

[0009] A circulation pump is connected to the battery stack and the liquid outlet control component through a pipeline; and the liquid return control component is connected to the battery stack through a pipeline.

[0010] Furthermore, the liquid storage system further comprises: a controller; the storage tank body is provided with a SOC acquisition module;

[0011] The controller is connected with the liquid outlet control component, the liquid return control component, the liquid level sensor, the SOC acquisition module, and the circulation pump.

[0012] The controller is used to select the current liquid outlet storage tank body and the current liquid return storage tank body according to the charging instruction or the discharging instruction, the SOC value and the liquid level value of the electrolyte in multiple storage tank bodies, open the liquid outlet control component of the current liquid outlet storage tank body, open the liquid return control component of the current liquid return storage tank body, and pump the electrolyte from the current liquid outlet storage tank body into the battery stack through the circulation pump for reaction and then flow back to the current liquid return storage tank body.

[0013] Furthermore, the liquid storage system also includes:

[0014] A liquid return port is arranged at the top of the storage tank body;

[0015] A liquid return pipe connected to the liquid return port, the liquid return control component, and the battery stack;

[0016] A liquid outlet is arranged in the middle of the storage tank body;

[0017] A liquid outlet pipe connected to the liquid outlet, the liquid outlet control element, and the inlet of the circulation pump;

[0018] The liquid outlet inner tube is connected with the liquid outlet, is arranged inside the storage tank body, and has a bottom in contact with the bottom surface of the storage tank body.

[0019] Further, the storage tank body includes a first tank body, a second tank body, a third tank body, a fourth tank body, a fifth tank body, a sixth tank body, a seventh tank body, an eighth tank body, a ninth tank body and a tenth tank body respectively connected to the pipeline, and the first tank body to the tenth tank body are placed in the container;

[0020] The liquid return control component includes a first liquid return solenoid valve, a second liquid return solenoid valve, a third liquid return solenoid valve, a fourth liquid return solenoid valve, a fifth liquid return solenoid valve, a sixth liquid return solenoid valve, a seventh liquid return solenoid valve, an eighth liquid return solenoid valve, a ninth liquid return solenoid valve, and a tenth liquid return solenoid valve respectively installed at the liquid return ports of the first tank body to the tenth tank body;

[0021] The liquid outlet control component includes a first liquid outlet solenoid valve, a second liquid outlet solenoid valve, a third liquid outlet solenoid valve, a fourth liquid outlet solenoid valve, a fifth liquid outlet solenoid valve, a sixth liquid outlet solenoid valve, a seventh liquid outlet solenoid valve, an eighth liquid outlet solenoid valve, a ninth liquid outlet solenoid valve, and a tenth liquid outlet solenoid valve respectively installed at the liquid outlet; the liquid level sensor is arranged on one side of each storage tank body; the height of the liquid outlet control component is lower than the height of the liquid return control component on the storage tank body.

[0022] Furthermore, the side of the tank body is L-shaped, and the two tank bodies are symmetrically arranged. Multiple tank bodies are placed side by side in the container to form an overall structure with a U-shaped side. The liquid outlet control component, liquid outlet pipe, and circulation pump are located in the middle groove of the overall structure.

[0023] In a second aspect, a method for using a product-level liquid flow battery multi-compartment liquid storage device is provided, wherein the product-level liquid flow battery multi-compartment liquid storage device is used, and the method for using the product-level liquid flow battery multi-compartment liquid storage device comprises the following steps:

[0024] The controller selects the current liquid outlet storage tank body and the current liquid return storage tank body according to the charging instruction or the discharging instruction, the SOC value and the liquid level value of the electrolyte in the storage tank body, opens the liquid outlet control component (3) of the current liquid outlet storage tank body, opens the liquid return control component (2) of the current liquid return storage tank body, and pumps the electrolyte in the current liquid outlet storage tank body into the battery stack through the circulation pump (5) for reaction and then flows back to the current liquid return storage tank body.

[0025] Furthermore, it also includes:

[0026] When the liquid level of the electrolyte in the current liquid outlet storage tank body reaches the first preset liquid level, the controller selects the current liquid outlet storage tank body again and opens the liquid outlet control component (3) of the current liquid outlet storage tank body; when the liquid level of the electrolyte in the current liquid outlet storage tank body reaches the second preset liquid level, the liquid outlet control component (3) of the current liquid outlet storage tank body is closed; when the liquid level of the electrolyte in the current liquid return storage tank body reaches the third preset liquid level, the controller selects the current liquid return storage tank body again and opens the liquid return control component (2) of the current liquid return storage tank body, and closes the liquid return control component (2) of the current liquid return storage tank body whose electrolyte level reaches the third preset liquid level.

[0027] Furthermore, when the product-level liquid flow battery multi-compartment liquid storage device is used to store positive electrode electrolyte,

[0028] When charging, the controller selects the current outlet tank body of the positive electrolyte as follows:

[0029] From the positive electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the positive electrode electrolyte storage tank body, at least one positive electrode electrolyte storage tank body is selected one by one with the minimum liquid level as the current liquid outlet storage tank body of the positive electrode electrolyte;

[0030] When charging, the controller selects the current return liquid storage tank body of the positive electrolyte as follows:

[0031] Determine whether there are a preset number of positive electrode electrolyte storage tank bodies whose liquid levels are not higher than a second preset liquid level. If so, select the current liquid return storage tank body of the positive electrode electrolyte from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current liquid return storage tank body of the positive electrode electrolyte from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current liquid return storage tank bodies of the positive electrode electrolyte one by one from the positive electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC of the electrolyte in the positive electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition.

[0032] Furthermore, when the product-level liquid flow battery multi-compartment liquid storage device is used to store negative electrode electrolyte,

[0033] During charging, the controller selects the current outlet tank body of the negative electrolyte as follows:

[0034] From the negative electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank body, at least one negative electrode electrolyte storage tank body is selected one by one based on the minimum liquid level as the current liquid outlet storage tank body of the negative electrode electrolyte;

[0035] During charging, the controller selects the current return tank body of the negative electrolyte as follows:

[0036] Determine whether there are a preset number of negative electrode electrolyte storage tank bodies whose liquid levels are not higher than a second preset liquid level. If so, select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current return liquid storage tank bodies of the negative electrode electrolyte one by one from the negative electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC of the electrolyte in the negative electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition.

[0037] Furthermore, when the product-level liquid flow battery multi-compartment liquid storage device is used to store positive electrode electrolyte,

[0038] During discharge, the controller selects the current outlet tank body of the positive electrolyte as follows:

[0039] From the positive electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC value of the electrolyte in the positive electrode electrolyte storage tank body, at least one positive electrode electrolyte storage tank body is selected one by one with the minimum liquid level as the current liquid outlet storage tank body of the positive electrode electrolyte;

[0040] During discharge, the controller selects the current return liquid storage tank body of the positive electrode electrolyte as follows:

[0041] Determine whether there are positive electrode electrolyte storage tank bodies that meet a preset number of liquid levels not higher than a second preset liquid level. If so, select the current liquid return storage tank body of the positive electrode electrolyte storage tank body from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current liquid return storage tank body of the positive electrode electrolyte from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current liquid return storage tank bodies of the positive electrode electrolyte one by one from the positive electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the positive electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition;

[0042] And / or, when the product-level liquid flow battery multi-compartment liquid storage device is used to store negative electrode electrolyte,

[0043] During discharge, the controller selects the negative electrode electrolyte tank body in the following process:

[0044] From the negative electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank body, at least one negative electrode electrolyte storage tank body is selected one by one with the minimum liquid level as the current liquid outlet storage tank body of the negative electrode electrolyte;

[0045] During discharge, the controller selects the current return liquid storage tank body of the negative electrode electrolyte as follows:

[0046] Determine whether there are a preset number of negative electrode electrolyte storage tank bodies whose liquid levels are not higher than a second preset liquid level. If so, select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current return liquid storage tank bodies of the negative electrode electrolyte one by one from the negative electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC of the electrolyte in the negative electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition.

[0047] The above solution of the present invention includes at least the following beneficial effects:

[0048] The present invention can avoid electrolyte mixing, and the concentration of active substances flowing into the battery stack electrolyte is consistent, which can improve the utilization rate of the electrolyte. At the same time, the calculation of the battery capacity is more accurate, the flow demand of the battery stack is more precise, and the overall efficiency of the battery is higher. Under the same cut-off voltage range and the same test conditions, the multi-compartment liquid storage tank system can charge more electricity (15%) during charging and release more electricity during discharge compared to the uniform mixing system. On the other hand, it also verifies that the mixing loss of the electrolyte in the liquid storage tank will reduce the utilization rate of the electrolyte.

[0049] Each storage tank has only one-tenth of excess space, and does not occupy significantly more volume, saving costs on the product. Smaller storage tanks can be made into standardized rotational molded products to increase transportation strength, and can also be used as electrolyte transport barrels to solve the problem that large storage tanks cannot carry electrolytes for transportation, greatly reducing transportation costs.

[0050] Compared with the existing cylindrical storage tanks, the special-shaped electrolyte storage tank provided by the present invention can be directly assembled into a container, thereby greatly improving the volume utilization rate in the container and reducing the construction cost.

[0051] The setting of the liquid outflow control part and the liquid return control part makes the electrolyte extraction and return process more flexible and controllable. This can not only meet the needs under different working conditions, but also effectively prevent the waste and pollution of electrolyte. At the same time, the flexible operation of the control part also simplifies the daily management work.

[0052] The present invention can reduce the potential risk of leakage by accurately controlling the flow of electrolyte, thereby improving the safety of the entire system. In addition, real-time liquid level monitoring can also promptly detect and handle abnormal situations, further ensuring the safe operation of the system. This configuration makes the maintenance of the liquid storage system more convenient. For example, the real-time data of the liquid level sensor can provide accurate information for maintenance personnel, helping them to promptly detect and handle problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a container structure diagram of a product-level liquid flow battery multi-compartment liquid storage device provided by an embodiment of the present invention.

[0054] Figure 2 It is a schematic diagram of an assembled multi-chamber liquid storage device for a product-level liquid flow battery provided by an embodiment of the present invention.

[0055] Figure 3 It is a schematic diagram of the structure of a tank body of a product-level liquid flow battery multi-compartment liquid storage device provided by an embodiment of the present invention.

[0056] Figure 4 It is a system schematic diagram of another embodiment of the present invention when it is specifically applied.

[0057] Figure 5 It is a comparison diagram of charging and discharging voltage curves of a battery system provided by an embodiment of the present invention.

[0058] Explanation of the accompanying drawings: 1. inner liquid outlet pipe; 2. liquid return control component; 3. liquid outlet control component; 4. liquid level sensor; 5. circulating pump; 6. storage tank body; 7. liquid return pipe; 8. liquid return port; 9. liquid outlet pipe; 10. liquid outlet; 11. container. DETAILED DESCRIPTION

[0059] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0060] like Figures 1 to 4 As shown, an embodiment of the present invention provides a product-level liquid flow battery multi-chamber liquid storage device, comprising:

[0061] The liquid storage system is connected to the battery stack through a pipeline, and the liquid storage system includes a storage tank body 6; a liquid outlet control component 3 and a liquid return control component 2 are arranged on the storage tank body 6, and a liquid level sensor 4 is arranged on the other side;

[0062] The circulation pump 5 is connected to the battery stack and the liquid outlet control component 3 through a pipeline, and is used to drive the electrolyte to circulate in the liquid storage system; the liquid return control component 2 is connected to the battery stack through a pipeline.

[0063] In an embodiment of the present invention, the battery stack is the core component of the battery system, which is responsible for performing electrochemical reactions and realizing the charging and discharging process of the battery. The liquid storage system is mainly composed of a tank body 6, which is not only used to store electrolyte, but also accurately manages the flow of electrolyte through the liquid outlet control component 3 and the liquid return control component 2 arranged thereon. The liquid outlet control component 3 is responsible for regulating the outflow of electrolyte to ensure that the electrolyte can be supplied to the battery stack as needed. The liquid return control component 2 controls the reflux of the electrolyte after the reaction to ensure that the electrolyte can be safely and stably returned to the tank body 6. In addition, the tank body 6 is also equipped with a liquid level sensor 4, which monitors the electrolyte level in the tank in real time. This design not only helps the operator to understand the remaining amount of electrolyte at any time, but also prevents potential problems caused by insufficient or excessive electrolyte. Figure 3 The figure is only an example of the liquid level sensor 4 and is not intended to limit the installation position of the liquid level sensor 4. The installation position, quantity and model of the liquid level sensor 4 can be flexibly adjusted as needed.

[0064] The circulation pump 5 is closely connected to the battery stack and the liquid discharge control unit 3 through the pipeline. When the circulation pump is started, it extracts electrolyte from the storage tank body 6 and pumps the electrolyte stably into the battery stack through the liquid discharge control unit 3. In the battery stack, the electrolyte participates in the electrochemical reaction to achieve energy conversion and storage. Once the electrolyte completes its electrochemical reaction in the battery stack, it flows back to the liquid storage system through the pipeline. This reflux process is precisely managed by the liquid return control unit 2 to ensure that every drop of electrolyte can be smoothly and safely returned to the storage tank body 6 to prepare for the next round of electrochemical reaction.

[0065] The circulation pump ensures that the electrolyte circulates efficiently between the storage system and the stack, thereby improving the efficiency and speed of the electrochemical reaction. The liquid level sensor provides real-time liquid level data, which helps to accurately control the amount of electrolyte in the tank, prevent overflow or drying, and ensure stable operation of the system. The design of the liquid outflow control and liquid return control makes the flow of electrolyte more controllable and safe, reducing the risk of leakage and waste. Optimized electrolyte circulation and management help maintain the uniformity and activity of the electrolyte, thereby extending the service life of the battery. By ensuring a continuous and uniform supply of electrolyte in the stack, this structure helps to improve the performance and charging and discharging efficiency of the entire battery system.

[0066] The present application adopts a mode of multiple tank bodies, and each tank body is individually controlled to be opened and closed. During use, one tank body can be initially selected as an empty tank, and the remaining tank bodies are filled with electrolyte. Then the tank bodies filled with electrolyte are opened one by one, and the electrolyte flows through the battery stack and then flows into the empty tank. In this way, it can be ensured that the electrolyte after the reaction is not mixed with the electrolyte before the reaction. After the electrolyte in all the tank bodies has reacted once, the next round of reaction is started. In this way, the concentration of the electrolyte entering the battery stack is constant within a certain stage, and the efficiency of the battery stack is higher. Compared with the electrolyte with constantly changing concentration, the flow control of the pump is also simpler.

[0067] The liquid storage system also includes: a controller; a storage tank body 6 is provided with an SOC acquisition module; the controller is connected with a liquid outlet control component 3, a liquid return control component 2, a liquid level sensor 4, an SOC acquisition module, and a circulation pump 5. The controller is used to select the current liquid outlet storage tank body and the current liquid return storage tank body according to the charging instruction or the discharging instruction, the SOC value and the liquid level value of the electrolyte in the multiple storage tank bodies, open the liquid outlet control component 3 of the current liquid outlet storage tank body, open the liquid return control component 2 of the current liquid return storage tank body, and pump the electrolyte from the current liquid outlet storage tank body into the battery stack through the circulation pump 5 for reaction and then flow back to the current liquid return storage tank body.

[0068] like Figures 1 to 4 As shown, the liquid storage system also includes:

[0069] A liquid return port 8 is provided at the top of the storage tank body 6;

[0070] The liquid return pipe 7 is connected with the liquid return port 8, the liquid return control element 2, and the battery stack;

[0071] The liquid outlet 10 is arranged in the middle of the storage tank body 6;

[0072] The liquid outlet pipe 9 is connected to the liquid outlet 10, the liquid outlet control member 3, and the inlet of the circulation pump 5, and is used to control the liquid to flow from the liquid outlet 10 and the liquid outlet pipe 9 to the pipeline in sequence. When installed, the corresponding liquid outlets 10 on the two storage tank bodies 6 are connected through a pipeline, and then the middle part of the pipeline is connected to the liquid outlet pipe 9;

[0073] The inner liquid outlet tube 1 is connected to the liquid outlet port 10 and is in an inverted T shape. The inner liquid outlet tube 1 is arranged inside the storage tank body 6, and the bottom is in contact with the bottom surface of the storage tank body 6. A plurality of liquid inlet holes are arranged at the bottom.

[0074] In an embodiment of the present invention, the electrolyte is stored in the tank body 6, and the liquid level sensor monitors the liquid level of the electrolyte in real time. When the battery stack needs electrolyte, the liquid outlet control component 3 will be adjusted to the open state, allowing the electrolyte to flow out from the liquid outlet 10. At this time, the electrolyte flows to the battery stack through the liquid outlet pipe 9. After the electrolyte enters the battery stack, it participates in the electrochemical reaction and performs the charging and discharging process. After the electrolyte completes the reaction in the battery stack, it begins to flow back to the tank body 6. The refluxed electrolyte flows to the liquid return port 8 through the liquid return pipe 7. Since the liquid return port 8 is located at the top of the tank, the electrolyte naturally sinks into the tank due to gravity. In this process, the liquid return control component 2 plays a role in adjusting the reflux speed to ensure that the electrolyte returns to the tank smoothly and safely. Throughout the entire workflow, the liquid level sensor continuously monitors the electrolyte level in the tank. If the liquid level is found to be too high or too low, the operator will adjust the liquid outlet control component 3 and the liquid return control component 2 in time to ensure that the liquid level is maintained within a safe range. According to the working state of the battery stack and the consumption of the electrolyte, the speed of liquid discharge and liquid return is adjusted in time, and the circulation pump 5 is started or shut down to ensure the stable operation of the system and the efficient use of the electrolyte.

[0075] Through the precise adjustment of the liquid outlet control component 3 and the liquid return control component 2, the electrolyte outflow and reflux speed can be precisely controlled to meet the needs of the battery stack under different working conditions. The real-time monitoring function of the liquid level sensor helps to detect liquid level abnormalities in a timely manner, prevent potential leakage or drying risks, and improve the safety of the system. The addition of the circulation pump 5 allows the electrolyte to flow quickly and efficiently when needed, thereby improving the operating efficiency of the entire system. The system is flexibly designed and can adjust the flow rate and flow rate of the electrolyte according to actual needs to adapt to different working conditions and battery requirements.

[0076] like Figures 1 to 4 As shown, the tank body 6 is provided with multiple groups, including a first tank body TANK101, a second tank body TANK102, a third tank body TANK103, a fourth tank body TANK104, a fifth tank body TANK105, a sixth tank body TANK106, a seventh tank body TANK107, an eighth tank body TANK108, a ninth tank body TANK109 and a tenth tank body TANK110 which are respectively connected to the pipeline, and the first tank body TANK101 to the tenth tank body TANK110 are placed in the container 11.

[0077] Specifically, the circulation pump 5 drives the electrolyte to be extracted from a certain tank body (such as the first tank body), and is transported to the battery stack through the liquid outlet control component 3 and the pipeline for charge and discharge reaction. The reacted electrolyte is then returned to another tank body (such as the second tank body) through the liquid return control component 2 and the pipeline. During this process, the liquid level sensor 4 monitors the electrolyte level in each tank body in real time to ensure that the circulation of the electrolyte can proceed smoothly. As the charge and discharge reaction proceeds, the active substances in the electrolyte will be consumed or generated, causing the electrolyte concentration in each tank body to change. In order to maintain the balance of the electrolyte concentration, the system will extract the electrolyte from each tank body in turn and inject it into other tank bodies in a certain order and rules to achieve the balance and recycling of the electrolyte.

[0078] At the same time, this design also improves the flexibility and scalability of the system. By setting the storage tank body as multiple groups of tanks, the entire liquid storage system is more modular, easy to expand and maintain, and easy to set up battery systems with different electrolyte capacities and volumes. The number of storage tank bodies is adjusted according to the energy storage time of the flow battery, which can not only meet the separation of electrolytes with different reaction activities, but also minimize the unnecessary space occupation.

[0079] From the perspective of engineering application, it is also necessary to consider that the storage tank can be transported with liquid to reduce the transportation cost of the electrolyte and the workload of tank liquid on site. Placing multiple tanks in a container effectively improves space utilization, reduces floor space, and makes the entire system more compact and efficient. Existing large storage tanks cannot transport electrolytes, and the electrolytes need to be transported to the site separately by ton barrels. Existing containers and electrolytes are transported separately to the project site, while the liquid storage device provided by the present invention can hold a quarter of the electrolyte for transportation together. For MWh projects, it can save millions of transportation costs.

[0080] By circulating and balancing the electrolyte between the tanks, it is possible to ensure that the electrolyte in each tank is fully utilized, avoiding the problem of electrolyte waste and uneven concentration. Through the coordination of the liquid level sensor and the control system, the electrolyte level and concentration in each tank can be monitored in real time, and the circulation path and amount of the electrolyte can be adjusted according to the actual situation, thereby ensuring the stable operation and efficient utilization of the system.

[0081] like Figures 1 to 4 As shown, the liquid return control component 2 includes a first liquid return solenoid valve UV101, a second liquid return solenoid valve UV102, a third liquid return solenoid valve UV103, a fourth liquid return solenoid valve UV104, a fifth liquid return solenoid valve UV105, a sixth liquid return solenoid valve UV106, a seventh liquid return solenoid valve UV107, an eighth liquid return solenoid valve UV108, a ninth liquid return solenoid valve UV109, and a tenth liquid return solenoid valve UV110 respectively installed at the liquid return ports 8 of the first tank body to the tenth tank body;

[0082] The liquid outlet control part 3 includes a first liquid outlet solenoid valve UV201, a second liquid outlet solenoid valve UV202, a third liquid outlet solenoid valve UV203, a fourth liquid outlet solenoid valve UV204, a fifth liquid outlet solenoid valve UV205, a sixth liquid outlet solenoid valve UV206, a seventh liquid outlet solenoid valve UV207, an eighth liquid outlet solenoid valve UV208, a ninth liquid outlet solenoid valve UV209, and a tenth liquid outlet solenoid valve UV210, which are respectively installed at the liquid outlets 10 of the first tank body to the tenth tank body. The liquid level sensor 4 is arranged on one side of each storage tank body 6.

[0083] In an embodiment of the present invention, each tank body (from the first tank body to the tenth tank body) of the liquid storage system is equipped with a corresponding liquid return control component and a liquid outlet control component. Specifically, a liquid return solenoid valve (from the first liquid return solenoid valve to the tenth liquid return solenoid valve) is installed at the liquid return port of each tank, and a liquid outlet solenoid valve (from the first liquid outlet solenoid valve to the tenth liquid outlet solenoid valve) is installed at the liquid outlet. The liquid return solenoid valve and the liquid outlet solenoid valve of each tank can be independently controlled, which means that the electrolyte outflow and reflux of a certain tank can be opened or closed separately as needed. Although each solenoid valve can work independently, in actual operation, they usually work together according to the overall needs of the system. For example, when the battery stack needs more electrolyte, multiple liquid outlet solenoid valves can be opened at the same time to increase the supply of electrolyte. Through programming or manual control, the opening and closing time of each solenoid valve can be flexibly adjusted to accurately control the outflow and reflux of the electrolyte in each tank. In an emergency, such as a failure or leak in a storage tank, the corresponding solenoid valve can be quickly closed to cut off the flow of electrolyte and ensure the safety of the system.

[0084] By equipping each tank with an independent solenoid valve, the flow of electrolyte in each tank can be precisely controlled to meet the needs of the battery stack under different working conditions. Multiple independent solenoid valves enable the system to flexibly adjust the supply and return of electrolyte according to different situations, improving the adaptability and flexibility of the system. In the event of a fault or abnormal situation, the flow of electrolyte in a specific tank can be quickly cut off, effectively preventing the accident from expanding and improving the safety of the system.

[0085] like Figures 1 to 4 As shown, the height of the liquid outlet control component 3 is lower than the height of the liquid return control component 2 on the storage tank body 6.

[0086] In an embodiment of the present invention, in the liquid storage system, the installation height of the liquid outlet control component 3 (i.e., the liquid outlet solenoid valve) is lower than the height of the liquid return control component 2 (i.e., the liquid return solenoid valve) on the tank body 6. This design is based on the principles of liquid gravity and flow, and to ensure the smooth operation and safety of the system. Since the liquid outlet control component 3 is located at a lower position, when the liquid outlet solenoid valve is opened, part of the electrolyte will naturally flow out of the tank due to gravity without the need for additional power. This helps to simplify the system and reduce energy consumption. The liquid return control component 2 is located at a higher position. The height difference design also allows the flow of the electrolyte to be controlled by levels when necessary. For example, in certain maintenance or emergency situations, the lower liquid outlet control component can be closed first to prevent the electrolyte from continuing to flow out, while still allowing the electrolyte to flow back into the tank.

[0087] The electrolyte flows out naturally by gravity, reducing energy consumption and the need for additional pumping equipment, thereby reducing operating costs. The height difference design reduces the risk of cross-contamination of the return and outflowing electrolyte, helping to maintain the purity and quality of the electrolyte. In an emergency, the outflow control can be quickly closed to stop the outflow of electrolyte, thereby reducing potential safety risks. The hierarchical control design makes it easier to manage and control the flow of electrolyte during maintenance and overhaul.

[0088] like Figures 1 to 4 As shown, the first tank body, the second tank body, the third tank body, the fourth tank body, the fifth tank body, the sixth tank body, the seventh tank body, the eighth tank body, the ninth tank body and the tenth tank body are all tank bodies of equal shape and volume. The two storage tank bodies are symmetrically arranged. When installed, multiple storage tank bodies are placed side by side in the container to form an overall structure with a U-shaped side. The liquid outlet control component 3, the liquid outlet pipe 9, and the circulating pump 5 are located in the middle groove of the overall structure.

[0089] Only by making special-shaped storage tanks can we make full use of the space in the container and develop container-type products. Traditional straight-cylinder storage tanks cannot be integrated into the container. This form can maximize the use of the space in the container, which greatly improves the volume utilization rate in the container compared to the existing cylindrical storage tanks. For energy storage projects of 100 MW or GW, a lot of installation space can be saved. The tank body and the tank body are not connected, and they are hoisted into the container, which is very convenient for disassembly and replacement, and the cost of replacing a single tank is lower. And container-type products are more suitable for the current energy storage projects with short delivery cycles and fast delivery progress. After the civil engineering foundation of the energy storage container is completed on site, the energy storage container can be installed on site. There is no need to build a factory building to meet the installation of traditional straight-cylinder storage tanks, shortening the factory building approval cycle and reducing construction costs.

[0090] In an embodiment of the present invention, for example, if one tank body needs to be repaired or cleaned, the other tank bodies can still continue to be used without affecting the operation of the entire system. According to actual needs, it is possible to flexibly choose to use part of the tank bodies to store electrolyte, so as to more finely manage the amount and flow of electrolyte. The multi-tank design also provides a safety redundancy. In extreme cases, if a tank body leaks or other failures occur, the remaining tank bodies can continue to be used to reduce the impact of the accident.

[0091] The tank body directly increases the storage capacity of each tank, allowing the entire storage system to store more electrolyte and support longer operation. The ability to operate each tank body independently as needed provides more options and flexibility for system operation. By providing backup and redundancy, the dual tank design improves system reliability and stability and reduces the risk of system downtime due to a single failure.

[0092] The product-level liquid flow battery multi-chamber liquid storage device provided in this application can be used as a positive electrode storage tank or a negative electrode storage tank of a liquid flow battery. When used as a positive electrode storage tank or a negative electrode storage tank, the device configuration is the same. Figure 2 It is a schematic diagram of a positive electrode storage tank or a negative electrode storage tank; Figure 1 This is a schematic diagram showing that the positive electrode storage tank and the negative electrode storage tank are arranged in one container at the same time.

[0093] like Figures 1 to 4 As shown, a method for using a product-level liquid flow battery multi-compartment liquid storage device is applied to a product-level liquid flow battery multi-compartment liquid storage device, and the method of use is as follows:

[0094] In the initial state, the first to ninth tanks are filled with electrolyte, and the tenth tank is empty. The electrolyte levels in each tank (the first to ninth tank) are monitored in real time by the first to tenth liquid level sensors. When the electrolyte in a tank (such as the second tank) is exhausted and the previous tank (such as the first tank) is filled, the system will close the second liquid outlet solenoid valve connected to the current tank (the second tank) and stop extracting electrolyte. At the same time, the system will close the first liquid return solenoid valve connected to the filled tank (the first tank) to ensure that the tank no longer receives electrolyte. Subsequently, the system will open the third liquid outlet solenoid valve connected to the next tank (such as the third tank) and start extracting electrolyte from the tank. At the same time, the system will open the second liquid return solenoid valve connected to the tank that has just been exhausted (the second tank) to inject the newly reacted electrolyte into this tank. This process will continue in this way, switching from the third tank to the fourth tank, and then from the fourth tank to the fifth tank, until the electrolyte of the ninth tank is exhausted and the eighth tank is filled. When the last tank (the eighth tank) is filled, the next cycle starts again.

[0095] By extracting electrolyte from each tank and injecting it into the previous tank in turn, it can be ensured that the electrolyte concentration in all tanks gradually converges to the same level, thereby improving the performance and stability of the battery. This circulation method can ensure that the electrolyte in each tank is fully utilized, avoiding the electrolyte in a tank from being deteriorated or wasted due to long-term unused. The entire process is automatically managed by the control system without human intervention, which improves the automation of the system and reduces operating costs and the possibility of human error. Since the electrolyte can circulate efficiently between the tanks, it can improve the efficiency of the charge and discharge reactions of the battery stack, thereby improving the performance of the entire liquid flow battery system.

[0096] In specific applications, in addition to the above-mentioned situation in which, during the charging and discharging process, when the electrolyte in any tank is exhausted, the system switches to the next tank until all tanks are used up, and then replenishes or recovers the electrolyte in sequence, there are other situations: for example, after one charge and discharge is completed, the state of the tank is not that one tank is empty and the rest are full, but there may be exactly eight full tanks and two half tanks, and the last time was charging, and the next time may be discharging. The next time of liquid discharge and return needs to be determined according to the actual situation:

[0097] The controller selects the current liquid outlet storage tank body of the positive electrolyte, the current liquid return storage tank body of the positive electrolyte, the current liquid outlet storage tank body of the negative electrolyte, and the current liquid return storage tank body of the negative electrolyte according to the charge and discharge instructions based on the SOC value of the electrolyte in the storage tank body and the liquid level value in the storage tank body, opens the liquid outlet control component 3 of the current liquid outlet storage tank body of the positive electrolyte and the current liquid outlet storage tank body of the negative electrolyte, opens the liquid return control component 2 of the current liquid return storage tank body of the positive electrolyte and the current liquid return storage tank body of the negative electrolyte, pumps the positive electrolyte in the current liquid outlet storage tank body of the positive electrolyte into the battery stack reaction and then flows back to the current liquid return storage tank body of the positive electrolyte, and pumps the negative electrolyte in the current liquid outlet storage tank body of the negative electrolyte into the battery stack reaction and then flows back to the current liquid return storage tank body of the negative electrolyte.

[0098] The regulation process of multiple positive and negative electrolyte storage tank bodies is as follows: the liquid outlet control component 3 of the current liquid outlet storage tank body of the positive electrolyte and the liquid return control component 2 of the current liquid return storage tank body of the positive electrolyte are opened through the controller, and the electrolyte of the current liquid outlet storage tank body of the positive electrolyte flows through the battery stack and then flows back to the current liquid return storage tank body of the positive electrolyte. When the liquid level of the current liquid outlet storage tank body of the positive electrolyte reaches the first preset liquid level, the controller selects the current liquid outlet storage tank body of the positive electrolyte again and opens the liquid outlet control component 3 of the current liquid outlet storage tank body of the positive electrolyte; when the liquid level of the current liquid outlet storage tank body of the positive electrolyte reaches the second preset liquid level, the liquid outlet control component 3 of the current liquid outlet storage tank body of the positive electrolyte is closed; when the liquid level of the current return liquid storage tank body of the positive electrolyte reaches the third preset liquid level, the current return liquid storage tank body of the positive electrolyte is selected again and the return liquid control component 2 of the current return liquid storage tank body of the positive electrolyte is opened, and the return liquid control component 2 of the current return liquid storage tank body whose liquid level reaches the third preset liquid level is closed.

[0099] When the product-level liquid flow battery multi-compartment storage device is used to store the positive electrode electrolyte:

[0100] When charging: The controller selects the current outlet tank body of the positive electrolyte in the following process:

[0101] From the positive electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the positive electrode electrolyte storage tank body, at least one (preferably 1) positive electrode electrolyte storage tank body is selected one by one with the minimum liquid level as the current liquid outlet storage tank body of the positive electrode electrolyte.

[0102] When charging: The controller selects the current return liquid storage tank body of the positive electrolyte in the following process:

[0103] Determine whether there are a preset number (preferably 1) of positive electrode electrolyte storage tank bodies (i.e., empty tank bodies) whose liquid levels are not higher than the second preset liquid level. If so, select the current liquid return storage tank body of the positive electrode electrolyte from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current liquid return storage tank body of the positive electrode electrolyte from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current liquid return storage tank bodies of the positive electrode electrolyte one by one from the positive electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC of the electrolyte in the positive electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition.

[0104] When the product-level liquid flow battery multi-compartment storage device is used to store negative electrode electrolyte:

[0105] During charging, the controller selects the current outlet tank body of the negative electrolyte as follows: the current outlet tank body of the negative electrolyte is selected from the negative electrolyte tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the negative electrolyte tank body, with the minimum liquid level as the screening condition;

[0106] During charging, the controller selects the current return tank body of the negative electrolyte as follows:

[0107] It is determined whether there are negative electrode electrolyte storage tank bodies that meet the preset number and whose liquid level is not higher than the second preset liquid level. If so, the current return liquid storage tank body of the negative electrode electrolyte is selected from the negative electrode electrolyte storage tank bodies whose liquid level is not higher than the second preset liquid level. Otherwise, the current return liquid storage tank body of the negative electrode electrolyte is first selected from the negative electrode electrolyte storage tank bodies whose liquid level is not higher than the second preset liquid level, and then the current return liquid storage tank bodies of the negative electrode electrolyte are selected one by one from the negative electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition. That is, the return liquid storage tank body is first selected from the empty storage tank bodies, and then the return liquid storage tank body is selected from the negative electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition.

[0108] During discharge: the controller selects the current outlet storage tank body of the positive electrolyte as follows: from the positive electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC value of the electrolyte in the positive electrolyte storage tank body, at least one (preferably 1) positive electrolyte storage tank body is selected one by one as the current outlet storage tank body of the positive electrolyte with the minimum liquid level as the screening condition. The process of the controller selecting the current return liquid storage tank body of the positive electrolyte is as follows: determine whether there are positive electrolyte storage tank bodies (i.e., empty tank bodies) that meet the preset number of liquid levels not higher than the second preset liquid level; if so, select the current return liquid storage tank body of the positive electrolyte from the positive electrolyte storage tank bodies with liquid levels not higher than the second preset liquid level; otherwise, first select the current return liquid storage tank body of the positive electrolyte from the positive electrolyte storage tank bodies with liquid levels not higher than the second preset liquid level, and then select the current return liquid storage tank bodies of the positive electrolyte one by one from the positive electrolyte storage tank bodies with SOC values ​​lower than the average SOC of the electrolyte in the positive electrolyte storage tank bodies with the minimum liquid level as the screening condition.

[0109] During discharge, the selection process of the negative electrode electrolyte storage tank body is similar to the above. At least one negative electrode electrolyte storage tank body is selected one by one from the negative electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank body, with the minimum liquid level as the screening condition, as the current liquid outlet storage tank body of the negative electrode electrolyte. During discharge, the controller selects the current return liquid storage tank body of the negative electrode electrolyte as follows: determine whether there are negative electrode electrolyte storage tank bodies that meet the preset number of liquid levels not higher than the second preset liquid level, and if so, select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level; otherwise, first select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank body one by one with the minimum liquid level as the screening condition. Also, first select the return liquid storage tank body from the empty storage tank body, and then select the return liquid storage tank body from the negative electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank body with the minimum liquid level as the screening condition.

[0110] For example: after the last round of charge and discharge, the SOC values ​​of the five tank bodies TANK101-105 in the positive electrode tank body are higher, the SOC values ​​of the tank bodies TANK106-110 are lower, and the electrolyte in TANK105 and TANK106 is half tank. If the next round is a charging process, TANK105 is selected as the return tank body, TANK106 is selected as the outlet tank body, and the electrolyte flowing out of TANK106 flows into TANK105 after passing through the battery stack. When the electrolyte level in TANK106 reaches the first preset level, it indicates that the liquid in TANK106 is less at this time. At this time, TANK107 is selected from TANK107-110 as the outlet tank body, and the outlet control of TANK107 is opened at the same time. The electrolyte flowing out of TANK106 and TANK107 flows out at the same time through the battery stack and flows into the return tank body. Selecting the two tank bodies for liquid transition can avoid the pump sucking empty when the outlet tank body is replaced in the middle. When the liquid level in TANK106 reaches the second preset level, it indicates that TANK106 can no longer discharge electrolyte. At this time, the outlet control of TANK106 is closed, and TANK106 is an empty tank, which will be used as the return tank body later. When the liquid level in TANK105 reaches the third preset liquid level, it indicates that the liquid level in TANK105 is already high, and the next liquid return storage tank body is selected. At this time, TANK106 is an empty tank, so TANK106 is selected and the liquid return control component of TANK106 is turned on, and the liquid return control component of TANK105 is closed. At this time, the electrolyte flowing out of TANK107 flows into TANK106 after the battery stack. When the electrolyte in TANK107 is less, TANK108 is continued to be selected as the liquid outlet storage tank body. When TANK106 reaches the third preset liquid level, TANK107 becomes an empty tank as the next liquid return storage tank body. The subsequent control process is similar until the electrolyte in TANK110 is emptied and there is electrolyte in TANK101-109. At this time, the electrolyte concentration in the 9 tanks of TANK101-109 is consistent. In this stage, the concentration of the electrolyte input to the stack is fixed. In the next stage, the liquid storage tank body is selected from TANK101-109, and TANK110 is used as the return liquid storage tank body until TANK101-109 are all emptied once. The concentration of the electrolyte input to the stack in this stage is also fixed. Therefore, in this application, the concentration of the electrolyte input to the stack is constant in a single stage until the charging process stops. If the next round is a discharge process, TANK105 is selected as the liquid outlet storage tank body, and TANK106 is selected as the return liquid storage tank body. The electrolyte flowing out of TANK105 flows into TANK106 after passing through the stack. The subsequent control process is similar.

[0111] Of course, multiple liquid return storage tank bodies and liquid outlet storage tank bodies can also be opened simultaneously. In order to maximize the volume utilization of the storage tank bodies, during operation, the number of liquid return storage tank bodies opened simultaneously is 1 or 2, and the number of liquid outlet storage tank bodies opened simultaneously is 1 or 2.

[0112] like Figure 5 As shown, it is a comparison diagram of the charge and discharge voltage curves of the battery system, and the ordinate represents the charge and discharge cut-off voltage. In this scheme, constant power charge and discharge experiments are carried out on different tanks of the same system.

[0113] parameter:

[0114] All-vanadium liquid flow battery system, each battery stack is 42kW (110 cells), 12 battery stacks, 6 in series and 2 in parallel. Constant power charging and discharging at 504kw.

[0115] Using the multi-chamber storage tank mode of the present application and the above-mentioned control method, the volume of the positive and negative electrolytes is 60 cubic meters each, and the number of storage tanks is 10. In the initial state, the electrolyte is loaded into 9 small storage tanks, each with a capacity of 6.7 cubic meters.

[0116] In contrast to the uniform mixing mode, there is only one storage tank for each positive and negative electrolyte, and each tank contains 60 cubic meters of electrolyte.

[0117] The charge and discharge cut-off voltage of a single system is 725-1023V (the charge cut-off voltage is 1.55V, and the discharge cut-off voltage is 1.1V). The initial electrolyte OCV voltage is 1.315V. For the charging process, the storage tank system with real-time and uniform mixing of the electrolyte stops charging when the battery voltage reaches 1023V, and the recording time is 4h. For the multi-compartment storage tank of the present application, when charging reaches 4h, the battery voltage has not reached the cut-off voltage, and the voltage can continue to be charged at around 1003V. The cut-off voltage is reached after charging for 4h36min. Therefore, the use of multi-compartment storage tanks can charge 15% more electricity during constant power charging, which significantly improves the utilization rate of the electrolyte.

[0118] After charging is completed, if both start discharging from the same state of charge, since the multi-compartment storage tank system is charged with more electricity, the electrolyte with a higher state of charge at the end of the charging process means that it can store more electricity, which can support the battery to release more electricity. It can also be seen from the figure that the uniformly mixed tank system stops discharging when the battery voltage reaches 660V, while the multi-compartment storage tank system can continue to discharge.

[0119] Under the same cut-off voltage range and the same test conditions, the multi-compartment storage tank can charge more electricity during charging and release more electricity during discharging compared to the uniformly mixed system, which significantly reduces the loss of electrolyte utilization caused by the mixing of electrolytes in the storage tank.

[0120] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A product-level liquid flow battery multi-compartment liquid storage device, characterized in that: include: A liquid storage system, wherein the liquid storage system comprises a plurality of storage tank bodies (6); the storage tank bodies (6) are provided with a liquid outlet control component (3), a liquid return control component (2) and a liquid level sensor (4); A circulation pump (5) is connected to the battery stack and the liquid outlet control component (3) through a pipeline; and the liquid return control component (2) is connected to the battery stack through a pipeline.

2. The product-level liquid flow battery multi-compartment liquid storage device according to claim 1, characterized in that: The liquid storage system further comprises: a controller; the storage tank body (6) is provided with a SOC acquisition module; The controller is connected to the liquid outlet control component (3), the liquid return control component (2), the liquid level sensor (4), the SOC acquisition module, and the circulation pump (5). The controller is used to select the current liquid outlet storage tank body and the current liquid return storage tank body according to the charging instruction or the discharging instruction, the SOC value and the liquid level value of the electrolyte in the multiple storage tank bodies, open the liquid outlet control component (3) of the current liquid outlet storage tank body, open the liquid return control component (2) of the current liquid return storage tank body, and pump the electrolyte from the current liquid outlet storage tank body into the battery stack through the circulation pump (5) for reaction and then flow back to the current liquid return storage tank body.

3. The product-level liquid flow battery multi-compartment liquid storage device according to claim 1, characterized in that: The liquid storage system also includes: A liquid return port (8) is arranged at the top of the storage tank body (6); A liquid return pipe (7) connected to the liquid return port (8), the liquid return control component (2), and the battery stack; A liquid outlet (10) is arranged in the middle of the storage tank body (6); A liquid outlet pipe (9) connected to the liquid outlet (10), the liquid outlet control element (3), and the inlet of the circulation pump (5); The liquid outlet inner tube (1) is connected to the liquid outlet (10), and is arranged inside the storage tank body (6), with its bottom abutting against the bottom surface of the storage tank body (6).

4. The product-level liquid flow battery multi-compartment liquid storage device according to claim 1, characterized in that: The storage tank body (6) comprises a first tank body, a second tank body, a third tank body, a fourth tank body, a fifth tank body, a sixth tank body, a seventh tank body, an eighth tank body, a ninth tank body and a tenth tank body respectively connected to the pipeline, and the first tank body to the tenth tank body are placed in the container (11); The liquid return control component (2) comprises a first liquid return solenoid valve, a second liquid return solenoid valve, a third liquid return solenoid valve, a fourth liquid return solenoid valve, a fifth liquid return solenoid valve, a sixth liquid return solenoid valve, a seventh liquid return solenoid valve, an eighth liquid return solenoid valve, a ninth liquid return solenoid valve and a tenth liquid return solenoid valve respectively installed at the liquid return ports (8) of the first tank body to the tenth tank body; The liquid outlet control component (3) comprises a first liquid outlet solenoid valve, a second liquid outlet solenoid valve, a third liquid outlet solenoid valve, a fourth liquid outlet solenoid valve, a fifth liquid outlet solenoid valve, a sixth liquid outlet solenoid valve, a seventh liquid outlet solenoid valve, an eighth liquid outlet solenoid valve, a ninth liquid outlet solenoid valve and a tenth liquid outlet solenoid valve respectively installed at the liquid outlets (10) of the first tank body to the tenth tank body; the liquid level sensor (4) is arranged on one side of each storage tank body (6); the height of the liquid outlet control component (3) is lower than the height of the liquid return control component (2) on the storage tank body (6).

5. The product-level liquid flow battery multi-compartment liquid storage device according to claim 3, characterized in that: The side surface of the storage tank body (6) is L-shaped, and two of the storage tank bodies (6) are symmetrically arranged. A plurality of storage tank bodies (6) are placed side by side in a container to form an overall structure with a U-shaped side surface. The liquid outlet control component (3), the liquid outlet pipe (9), and the circulation pump (5) are located in a central groove of the overall structure.

6. A method for using the product-level liquid flow battery multi-compartment liquid storage device according to any one of claims 1 to 5, characterized in that: The method of use comprises the following steps: The controller selects the current liquid outlet storage tank body and the current liquid return storage tank body according to the charging instruction or the discharging instruction, the SOC value and the liquid level value of the electrolyte in the storage tank body, opens the liquid outlet control component (3) of the current liquid outlet storage tank body, opens the liquid return control component (2) of the current liquid return storage tank body, and pumps the electrolyte in the current liquid outlet storage tank body into the battery stack through the circulation pump (5) for reaction and then flows back to the current liquid return storage tank body.

7. The method for using the product-level liquid flow battery multi-compartment liquid storage device according to claim 6, characterized in that: Also includes, When the liquid level of the electrolyte in the current liquid outlet storage tank body reaches the first preset liquid level, the controller selects the current liquid outlet storage tank body again and opens the liquid outlet control component (3) of the current liquid outlet storage tank body; when the liquid level of the electrolyte in the current liquid outlet storage tank body reaches the second preset liquid level, the liquid outlet control component (3) of the current liquid outlet storage tank body is closed; when the liquid level of the electrolyte in the current liquid return storage tank body reaches the third preset liquid level, the controller selects the current liquid return storage tank body again and opens the liquid return control component (2) of the current liquid return storage tank body, and closes the liquid return control component (2) of the current liquid return storage tank body whose electrolyte level reaches the third preset liquid level.

8. The method for using the product-level liquid flow battery multi-compartment liquid storage device according to claim 7, characterized in that: When the product-level liquid flow battery multi-compartment liquid storage device is used to store positive electrode electrolyte, When charging, the controller selects the current outlet tank body of the positive electrolyte as follows: From the positive electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the positive electrode electrolyte storage tank body, at least one positive electrode electrolyte storage tank body is selected one by one with the minimum liquid level as the current liquid outlet storage tank body of the positive electrode electrolyte; When charging, the controller selects the current return liquid storage tank body of the positive electrolyte as follows: Determine whether there are a preset number of positive electrode electrolyte storage tank bodies whose liquid levels are not higher than a second preset liquid level. If so, select the current liquid return storage tank body of the positive electrode electrolyte from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current liquid return storage tank body of the positive electrode electrolyte from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current liquid return storage tank bodies of the positive electrode electrolyte one by one from the positive electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC of the electrolyte in the positive electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition.

9. The method for using the product-level liquid flow battery multi-compartment liquid storage device according to claim 7, characterized in that: When the product-level liquid flow battery multi-compartment liquid storage device is used to store negative electrode electrolyte, During charging, the controller selects the current outlet tank body of the negative electrolyte as follows: From the negative electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank body, at least one negative electrode electrolyte storage tank body is selected one by one based on the minimum liquid level as the current liquid outlet storage tank body of the negative electrode electrolyte; During charging, the controller selects the current return tank body of the negative electrolyte as follows: Determine whether there are a preset number of negative electrode electrolyte storage tank bodies whose liquid levels are not higher than a second preset liquid level. If so, select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current return liquid storage tank bodies of the negative electrode electrolyte one by one from the negative electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC of the electrolyte in the negative electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition.

10. The method for using the product-level liquid flow battery multi-compartment liquid storage device according to claim 7, characterized in that: When the product-level liquid flow battery multi-compartment liquid storage device is used to store positive electrode electrolyte, During discharge, the controller selects the current outlet tank body of the positive electrolyte as follows: From the positive electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC value of the electrolyte in the positive electrode electrolyte storage tank body, at least one positive electrode electrolyte storage tank body is selected one by one with the minimum liquid level as the current liquid outlet storage tank body of the positive electrode electrolyte; During discharge, the controller selects the current return liquid storage tank body of the positive electrode electrolyte as follows: Determine whether there are positive electrode electrolyte storage tank bodies that meet a preset number of liquid levels not higher than a second preset liquid level. If so, select the current liquid return storage tank body of the positive electrode electrolyte storage tank body from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current liquid return storage tank body of the positive electrode electrolyte from the positive electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current liquid return storage tank bodies of the positive electrode electrolyte one by one from the positive electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC value of the electrolyte in the positive electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition; And / or, when the product-level liquid flow battery multi-compartment liquid storage device is used to store negative electrode electrolyte, During discharge, the controller selects the negative electrode electrolyte tank body in the following process: From the negative electrode electrolyte storage tank bodies whose SOC values ​​are higher than the average SOC value of the electrolyte in the negative electrode electrolyte storage tank body, at least one negative electrode electrolyte storage tank body is selected one by one with the minimum liquid level as the current liquid outlet storage tank body of the negative electrode electrolyte; During discharge, the controller selects the current return liquid storage tank body of the negative electrode electrolyte as follows: Determine whether there are a preset number of negative electrode electrolyte storage tank bodies whose liquid levels are not higher than a second preset liquid level. If so, select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level. Otherwise, first select the current return liquid storage tank body of the negative electrode electrolyte from the negative electrode electrolyte storage tank bodies whose liquid levels are not higher than the second preset liquid level, and then select the current return liquid storage tank bodies of the negative electrode electrolyte one by one from the negative electrode electrolyte storage tank bodies whose SOC values ​​are lower than the average SOC of the electrolyte in the negative electrode electrolyte storage tank bodies with the minimum liquid level as the screening condition.

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