A liquid path SOC equalization system suitable for a vanadium redox flow battery
By using a liquid circuit SOC equalization system, the electrolyte blending between vanadium redox flow batteries is achieved through monitoring and control modules, which solves the problem of cumbersome SOC equalization in the prior art and achieves a simple battery equalization effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI CONSTR INVESTMENT AVIC SAIHAN GREEN ENERGY TECH DEV CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-21
AI Technical Summary
In the existing technology, the process of SOC equalization by adding external electrical circuits is cumbersome and makes it difficult to achieve simple equalization of vanadium redox flow batteries.
A liquid circuit SOC equalization system is adopted. The monitoring module monitors the SOC value of each vanadium battery in real time, and the control module calculates the average value and difference to control the opening and closing of the one-way valve, so as to realize the electrolyte blending between vanadium batteries and achieve equalization.
The SOC balancing process is simplified, avoiding real-time supplemental charging of systems with low SOC values during charging, and achieving easy balancing between vanadium batteries.
Smart Images
Figure CN224537078U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of battery management, and in particular to a liquid circuit SOC balancing system suitable for all-vanadium redox flow batteries. Background Technology
[0002] SOC (State of Charge) is the ratio of a battery's remaining capacity to its rated capacity. SOC is an important parameter for evaluating power battery packs, effectively characterizing their remaining charge.
[0003] Currently, SOC balancing is achieved by adding an external electrical circuit. This involves designing a separate electrical circuit in addition to the normal charging and discharging circuit. Through real-time SOC detection, the system with a low SOC value is supplemented with additional charge during the charging process to achieve SOC balancing. However, the process of achieving SOC balancing is quite cumbersome. Utility Model Content
[0004] To simplify the implementation of SOC balancing, this application provides a liquid circuit SOC balancing system suitable for all-vanadium redox flow batteries.
[0005] The liquid circuit SOC equalization system for vanadium redox flow batteries provided in this application adopts the following technical solution: A liquid circuit SOC equalization system suitable for all vanadium redox flow batteries includes a control module, a monitoring module, a first shared pipeline, a second shared pipeline, and multiple vanadium batteries; Each vanadium battery includes a positive electrode tank and a negative electrode tank. The positive electrode tank is equipped with a positive electrode forward pipe and a positive electrode reverse pipe, both of which are connected to a first shared pipe. The negative electrode tank is equipped with a negative electrode forward pipe and a negative electrode reverse pipe, both of which are connected to a second shared pipe. A one-way valve is installed on each of the positive electrode forward pipe, positive electrode reverse pipe, negative electrode forward pipe, and negative electrode reverse pipe. The control module is electrically connected to the one-way valve. The monitoring module is used to monitor the SOC value of each vanadium battery in real time. The control module is used to control the opening and closing of the one-way valve based on the SOC value of each vanadium cell.
[0006] Optionally, the control module includes a receiving unit, an average value calculation unit, a difference calculation unit, and an output unit, which are connected in sequence.
[0007] In summary, this application includes at least one of the following beneficial technical effects: The monitoring module monitors the SOC value of each vanadium battery and sends it to the control module. After receiving the SOC value of each vanadium battery, the control module calculates the average SOC value and then calculates the difference between the average SOC and the SOC value of each vanadium battery. Based on the difference, the control module controls the opening and closing of the one-way valve to achieve co-mixing of the positive and negative electrolytes between vanadium batteries. This eliminates the need for real-time supplementary charging of systems with lower SOC values during charging, thus easily achieving the goal of SOC equalization. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of a liquid circuit SOC balancing system applicable to a full vanadium redox flow battery according to an embodiment of this application.
[0009] Figure 2 This is a schematic diagram of a liquid circuit SOC equalization system applicable to all vanadium redox flow batteries according to an embodiment of this application.
[0010] Explanation of reference numerals in the attached diagram: 1. Control module; 11. Receiving unit; 12. Average value calculation unit; 13. Difference calculation unit; 14. Output unit; 2. Monitoring module; 3. Vanadium battery; 31. Positive electrode storage tank; 311. Positive electrode forward pipeline; 312. Positive electrode reverse pipeline; 32. Negative electrode storage tank; 321. Negative electrode forward pipeline; 322. Negative electrode reverse pipeline; 4. First shared pipeline; 5. Second shared pipeline; 6. Check valve. Detailed Implementation
[0011] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.
[0012] This application discloses a liquid circuit SOC equalization system suitable for vanadium redox flow batteries.
[0013] Reference Figure 1 and Figure 2 A liquid circuit SOC equalization system suitable for vanadium redox flow batteries includes a control module 1, a monitoring module 2, a first shared pipe 4, a second shared pipe 5, and multiple vanadium batteries 3.
[0014] Each vanadium battery 3 includes a positive electrode storage tank 31 and a negative electrode storage tank 32. The positive electrode storage tank 31 is equipped with a positive electrode forward pipe 311 and a positive electrode reverse pipe 312, both of which are connected to a first shared pipe 4. The negative electrode storage tank 32 is equipped with a negative electrode forward pipe 321 and a negative electrode reverse pipe 322, both of which are connected to a second shared pipe 5. A one-way valve 6 is installed on each of the positive electrode forward pipe 311, the positive electrode reverse pipe 312, the negative electrode forward pipe 321, and the negative electrode reverse pipe 322, and the one-way valve 6 is electrically connected to the control module 1.
[0015] Monitoring module 2 is connected in parallel to multiple vanadium batteries 3. Monitoring module 2 is used to monitor the SOC value of each vanadium battery 3 in real time. Each vanadium battery 3 is equipped with a small battery to monitor the state of charge of the electrolyte. One branch is taken from each of the positive electrode storage tank 31 and the negative electrode storage tank 32. By monitoring the open-circuit voltage of the small battery, the changes in different valence states of ions in the electrolyte in the positive electrode storage tank 31 and the negative electrode storage tank 32 are reflected, which is the SOC value (e.g., an open-circuit voltage of 1.2V to 1.5V corresponds to a state of charge of 0% to 100%). Monitoring module 2 is electrically connected to control module 1, and monitoring module 2 sends the real-time SOC value of each vanadium battery 3 to control module 1.
[0016] The control module 1 includes a receiving unit 11, an average value calculation unit 12, a difference value calculation unit 13, and an output unit 14. These units are connected sequentially. The receiving unit 11 receives the SOC value of each vanadium battery 3 output by the monitoring module 2. The average value calculation unit 12 calculates the average SOC value of all vanadium batteries 3. The difference value calculation unit 13 then calculates the difference between the average SOC value and the SOC value of each vanadium battery 3. The output unit 14 outputs a control signal based on the difference value to control the opening and closing of the one-way valve 6. It should be noted that the average value calculation unit 12 is an average value calculation circuit, and the difference value calculation unit 13 is a difference value calculation circuit. Both the average value calculation circuit and the difference value calculation circuit are common and simple circuits, and will not be described in detail here.
[0017] The implementation principle of a liquid circuit SOC balancing system applicable to vanadium redox flow batteries according to an embodiment of this application is as follows: The monitoring module 2 monitors the SOC value of each vanadium battery 3 and sends the SOC value of each vanadium battery 3 to the control module 1. After receiving the SOC value of each vanadium battery 3, the control module 1 calculates the average SOC value, and then calculates the difference between the average SOC and the SOC value of each vanadium battery 3. Based on the difference, the one-way valve 6 is controlled to open and close, causing the electrolyte in the positive electrode tank 31 to flow into the first shared pipe 4, and the electrolyte in the negative electrode tank 32 to flow into the second shared pipe 5. This allows the positive and negative electrolytes of the vanadium batteries 3 to be mixed in the same polarity, eliminating the need to replenish the system with a low SOC value in real time during charging, thus simply achieving the purpose of SOC balancing.
[0018] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A liquid circuit SOC balancing system suitable for all-vanadium redox flow batteries, characterized in that: It includes a control module (1), a monitoring module (2), a first shared pipeline (4), a second shared pipeline (5), and multiple vanadium batteries (3); Each vanadium battery (3) includes a positive electrode storage tank (31) and a negative electrode storage tank (32). The positive electrode storage tank (31) is equipped with a positive electrode forward pipe (311) and a positive electrode reverse pipe (312). The positive electrode forward pipe (311) and the positive electrode reverse pipe (312) are both connected to a first shared pipe (4). The negative electrode storage tank (32) is equipped with a negative electrode forward pipe (321) and a negative electrode reverse pipe (322). The negative electrode forward pipe (321) and the negative electrode reverse pipe (322) are both connected to a second shared pipe (5). A one-way valve (6) is installed on the positive electrode forward pipe (311), the positive electrode reverse pipe (312), the negative electrode forward pipe (321), and the negative electrode reverse pipe (322). The control module (1) is electrically connected to the one-way valve (6). The monitoring module (2) is used to monitor the SOC value of each vanadium battery (3) in real time; The control module (1) is used to control the opening and closing of the check valve (6) according to the SOC value of each vanadium cell (3).
2. The liquid circuit SOC equalization system for vanadium redox flow batteries according to claim 1, characterized in that: The control module (1) includes a receiving unit (11), an average value calculation unit (12), a difference calculation unit (13), and an output unit (14), which are connected in sequence.