CN-224232659-U - Capacity monitoring and recovering device for electrolyte of all-vanadium redox flow battery

Abstract

The utility model relates to the technical field of electrolyte, in particular to a capacity monitoring and recovering device for an electrolyte of an all-vanadium redox flow battery, which comprises an anode liquid storage tank, wherein the anode liquid storage tank is connected with one end of an ultraviolet detection unit, the other end of the ultraviolet detection unit is connected with a cathode liquid storage tank, and a bidirectional pump is further connected between the anode liquid storage tank and the cathode liquid storage tank. The method comprises the steps of firstly conveying positive electrolyte in a positive liquid storage tank to an ultraviolet detection unit to monitor valence state information of the electrolyte in real time, then calculating the quantity of negative electrolyte required by restoration of the positive electrolyte in the positive liquid storage tank, conveying the negative electrolyte in the negative liquid storage tank to the ultraviolet detection unit to monitor the valence state information of the electrolyte in real time, and then calculating the quantity of positive electrolyte required by restoration of the negative electrolyte in the negative liquid storage tank. And then the negative electrolyte in the negative electrolyte tank is conveyed into the positive electrolyte tank through a bidirectional pump according to the calculation result, so that the recovery of the electrolyte is realized.

Inventors

• XIAO GUANGHUI
• PU NIANWEN
• REN HUABIN
• FEI XUEMEI
• LI AIKUI
• DUAN YONGLONG
• HUA XIA
• XIAO WENYAN
• ZHOU WENJIA

Assignees

• 四川发展兴欣钒能源科技有限公司

Dates

Publication Date

20260512

Application Date

20250421

Claims (10)

1. 1. The capacity monitoring and recovering device for the electrolyte of the all-vanadium redox flow battery is characterized by comprising an anode liquid storage tank (1), wherein the anode liquid storage tank (1) is connected with one end of an ultraviolet detection unit (2), the other end of the ultraviolet detection unit (2) is connected with a cathode liquid storage tank (3), and a bidirectional pump (4) is further connected between the anode liquid storage tank (1) and the cathode liquid storage tank (3).
2. 2. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 1 is characterized in that the number of the ultraviolet detection units (2) is two, and the positive electrode liquid storage tank (1) and the negative electrode liquid storage tank (3) are respectively connected with one ultraviolet detection unit (2).
3. 3. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 1 or 2 is characterized in that the positive electrode liquid storage tank (1) is connected with a positive electrode pump (5).
4. 4. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 3, wherein the positive electrode pump (5) is connected with a positive electrode flowmeter (6).
5. 5. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 4, wherein a first ball valve (7) is arranged on a pipeline of the ultraviolet detection unit (2) close to the positive electrode flowmeter (6), and the first ball valve (7) prevents the electrolyte for recovering from entering the ultraviolet detection unit (2).
6. 6. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 5, wherein a second ball valve (8) is arranged on one side of the bi-directional pump (4) close to the positive electrode liquid storage tank (1), and the second ball valve (8) is used for preventing the positive electrode electrolyte from entering the bi-directional pump (4) during detection.
7. 7. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 1 or 2 is characterized in that the negative electrode liquid storage tank (3) is connected with a negative electrode pump (9).
8. 8. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 7, wherein the negative electrode pump (9) is connected with a negative electrode flowmeter (10).
9. 9. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 8, wherein a third ball valve (11) is arranged on a pipeline of the ultraviolet detection unit (2) close to the negative electrode flowmeter (10), and the third ball valve (11) prevents the electrolyte for recovering from entering the ultraviolet detection unit (2).
10. 10. The device for monitoring and recovering the capacity of the electrolyte of the all-vanadium redox flow battery according to claim 9, wherein a fourth ball valve (12) is arranged on one side of the bi-directional pump (4) close to the negative electrode liquid storage tank (3), and the fourth ball valve (12) is used for preventing the negative electrode electrolyte from entering the bi-directional pump (4) during detection.

Description

Capacity monitoring and recovering device for electrolyte of all-vanadium redox flow battery Technical Field The utility model relates to the technical field of electrolyte, in particular to a capacity monitoring and recovering device for an electrolyte of an all-vanadium redox flow battery. Background All-vanadium redox flow batteries play an important role in the energy storage field with excellent expandability, long service life and environmental suitability. Due to factors such as activity reduction of vanadium ions in the electrolyte, degradation of the membrane, pollution of the electrolyte and the like, the capacity of the all-vanadium redox flow battery can be attenuated after long-time operation, and the operation and maintenance cost can be increased while the performance of the battery is influenced. Therefore, developing an effective capacity fade detection device is critical to monitoring battery status in real time, assessing health, maintaining and optimizing operational strategies in time. Through potentiometric titration experiments, the concentration of vanadium ions in each valence state in the positive and negative electrolyte can be detected, and the change trend of the concentration is analyzed, so that the attenuation of the battery is estimated, but the quantitative electrolyte is taken out according to times in the mode, and the capacity attenuation of the battery cannot be monitored in real time. Aiming at the problem of online monitoring of battery capacity, patent (CN 221977984U) designs a real-time monitoring system of the electrolyte state of an all-vanadium redox flow battery, which comprises a positive electrode liquid pipe and a negative electrode liquid pipe, and is connected through a monolithic electric pile to realize real-time monitoring and sensitive induction of the electrolyte state, but the mode of evaluating the performance of the all-vanadium redox flow battery by using the charge and discharge of the electrolyte on the monolithic electric pile cannot rapidly display the attenuation of the battery capacity. Patent (CN 206179992U) designs a state monitoring device of electrolyte of an all-vanadium redox flow battery, which can monitor and feed back the concentration and flow of the electrolyte, improve the monitoring and tracking efficiency and shorten the time for finding problems, but the method for monitoring the concentration and flow of the electrolyte cannot intuitively reflect the attenuation of the battery capacity. In summary, the existing all-vanadium redox flow battery capacity fade monitoring device cannot recover the battery capacity after detecting the battery capacity fade condition. Disclosure of utility model The utility model aims to provide a device for monitoring and recovering the capacity of electrolyte of an all-vanadium redox flow battery, which solves the technical problem that the device for monitoring the concentration and flow of the electrolyte cannot recover the capacity of the battery in the prior art. The utility model discloses a capacity monitoring and recovering device of electrolyte of an all-vanadium redox flow battery, which comprises an anode liquid storage tank, wherein the anode liquid storage tank is connected with one end of an ultraviolet detection unit, the other end of the ultraviolet detection unit is connected with a cathode liquid storage tank, and a bidirectional pump is further connected between the anode liquid storage tank and the cathode liquid storage tank. The working principle is that the positive electrode electrolyte in the positive electrode liquid storage tank is conveyed to the ultraviolet detection unit to monitor the valence state information of the electrolyte in real time, then the quantity of the negative electrode electrolyte required by the recovery of the positive electrode electrolyte in the positive electrode liquid storage tank is calculated, the negative electrode electrolyte in the negative electrode liquid storage tank is conveyed to the ultraviolet detection unit to monitor the valence state information of the electrolyte in real time, and then the quantity of the positive electrode electrolyte required by the recovery of the negative electrode electrolyte in the negative electrode liquid storage tank is calculated. And then the negative electrolyte in the negative electrolyte tank is conveyed into the positive electrolyte tank through a bidirectional pump according to the calculation result, so that the recovery of the electrolyte is realized. Or the positive electrolyte in the positive electrolyte storage tank is conveyed into the negative electrolyte storage tank through a bidirectional pump, so that the recovery of the electrolyte is realized. The ultraviolet detection unit is arranged to monitor the valence state information of the electrolyte in real time, so that errors caused by off-line measurement of sampling are avoided, and the monitoring efficiency and accuracy are improved.