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 an all-vanadium redox flow battery electrolyte capacity monitoring and recovering device, which comprises a positive electrode liquid storage tank, the positive electrode 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 negative electrode liquid storage tank, and the negative electrode liquid storage tank is connected with a positive electrode. And a two-way pump is also connected between the positive electrode liquid storage tank and the negative electrode liquid storage tank. The positive electrolyte in the positive liquid storage tank is conveyed to the ultraviolet detection unit to monitor the valence information of the electrolyte in real time, and then the amount of the negative electrolyte required for recovering the positive electrolyte in the positive 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 amount of the positive electrode electrolyte required for recovery of the negative electrode electrolyte in the negative electrode liquid storage tank is calculated. And the negative electrode electrolyte in the negative electrode liquid storage tank is conveyed into the positive electrode liquid storage tank through the two-way pump according to a calculation result, so that the recovery of the electrolyte is realized.

Description

Technical Field

[0001] This utility model relates to the field of electrolyte technology, specifically to a capacity monitoring and recovery device for vanadium redox flow battery electrolyte. Background Technology

[0002] Vanadium redox flow batteries play a vital role in energy storage due to their excellent scalability, long lifespan, and environmental adaptability. However, the capacity of vanadium redox flow batteries decays over long periods of operation due to factors such as decreased vanadium ion activity in the electrolyte, membrane degradation, and electrolyte contamination. This not only affects battery performance but also increases maintenance costs. Therefore, developing an effective capacity decay detection device is crucial for real-time monitoring of battery status, assessment of health, timely maintenance, and optimization of operating strategies.

[0003] Potentiometric titration experiments allow us to detect the concentration of vanadium ions in different valence states in the positive and negative electrolytes and analyze their changing trends to assess battery degradation. However, this method requires taking out a fixed amount of electrolyte each time, making real-time monitoring of capacity decay impossible. To address the issue of online battery capacity monitoring, patent (CN221977984U) designed a real-time monitoring system for the electrolyte state of a full vanadium redox flow battery, including positive and negative electrolyte tubes connected via a single-chip stack. This system enables real-time monitoring and sensitive response of the electrolyte state. However, this method of evaluating performance by charging and discharging the electrolyte on a single-chip stack cannot quickly demonstrate battery capacity decay. Patent (CN206179992U) designed a state monitoring device for the electrolyte in a full vanadium redox flow battery. This device can monitor and provide feedback on the electrolyte concentration and flow rate, improving monitoring and tracking efficiency and shortening the time to detect problems. However, this method of monitoring electrolyte concentration and flow rate cannot directly reflect battery capacity decay. In summary, existing vanadium redox flow battery capacity decay monitoring devices cannot restore battery capacity after detecting capacity decay. Utility Model Content

[0004] The purpose of this invention is to provide a capacity monitoring and recovery device for vanadium redox flow battery electrolyte, solving the technical problem that existing devices for monitoring electrolyte concentration and flow rate cannot recover battery capacity.

[0005] This utility model discloses a capacity monitoring and recovery device for vanadium redox flow battery electrolyte, including a positive electrode storage tank, one end of which is connected to an ultraviolet detection unit, and the other end of which is connected to a negative electrode storage tank. A bidirectional pump is also connected between the positive electrode storage tank and the negative electrode storage tank.

[0006] Working principle: First, the positive electrolyte in the positive electrode storage tank is transported to the ultraviolet detection unit to monitor the valence state of the electrolyte in real time. Then, the amount of negative electrolyte required to restore the positive electrolyte in the positive electrode storage tank is calculated. Then, the negative electrolyte in the negative electrode storage tank is transported to the ultraviolet detection unit to monitor the valence state of the electrolyte in real time. Finally, the amount of positive electrolyte required to restore the negative electrolyte in the negative electrode storage tank is calculated.

[0007] Based on the calculation results, the negative electrode electrolyte in the negative electrode storage tank is then transported to the positive electrode storage tank through a bidirectional pump to restore the electrolyte.

[0008] Alternatively, the positive electrolyte in the positive electrode storage tank can be transported to the negative electrode storage tank via a bidirectional pump to restore the electrolyte.

[0009] By setting up an ultraviolet detection unit, the valence state information of the electrolyte can be monitored in real time, avoiding errors caused by offline sampling and measurement, and improving monitoring efficiency and accuracy.

[0010] By setting up a bidirectional pump, the positive or negative electrolyte can be restored according to the degree of attenuation.

[0011] Furthermore, there are two ultraviolet detection units, with one ultraviolet detection unit connected to each of the positive and negative electrode storage tanks.

[0012] By setting up two ultraviolet detection units, the electrolyte in both the positive and negative electrode storage tanks can be detected simultaneously, thereby improving detection efficiency.

[0013] Furthermore, the positive electrode storage tank is connected to a positive electrode pump.

[0014] By setting up a positive electrode pump, the positive electrode electrolyte in the positive electrode storage tank can be transported to the ultraviolet detection unit or a bidirectional pump, which facilitates subsequent detection and recovery.

[0015] Furthermore, the positive pump is connected to a positive flow meter.

[0016] By setting up a positive flow meter and using it in conjunction with a positive pump, the flow rate and injection time can be observed, enabling accurate sampling.

[0017] Furthermore, a first ball valve is provided on the pipe of the ultraviolet detection unit near the positive electrode flow meter. The first ball valve prevents the electrolyte used for recovery from entering the ultraviolet detection unit.

[0018] Furthermore, a second ball valve is provided on the side of the bidirectional pump near the positive electrode storage tank. The second ball valve is used to prevent the positive electrode electrolyte from entering the bidirectional pump during detection.

[0019] Furthermore, the negative electrode storage tank is connected to a negative electrode pump.

[0020] By setting up a negative electrode pump, the negative electrode electrolyte in the negative electrode storage tank can be transported to the ultraviolet detection unit or a bidirectional pump, which facilitates subsequent detection and recovery.

[0021] Furthermore, the negative electrode pump is connected to a negative electrode flow meter.

[0022] By setting up a negative electrode flow meter and using it in conjunction with a negative electrode pump, the flow rate and injection time can be observed, enabling accurate sampling.

[0023] Furthermore, a third ball valve is provided on the pipe of the ultraviolet detection unit near the negative electrode flow meter. The third ball valve prevents the electrolyte used for recovery from entering the ultraviolet detection unit.

[0024] Furthermore, a fourth ball valve is provided on the side of the bidirectional pump near the negative electrode storage tank. The fourth ball valve is used to prevent the negative electrode electrolyte from entering the bidirectional pump during detection.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] 1. By setting up an ultraviolet detection unit, the valence state information of the electrolyte can be monitored in real time, avoiding errors caused by offline sampling and measurement, and improving monitoring efficiency and accuracy;

[0027] 2. By setting up a bidirectional pump, the positive or negative electrolyte can be restored according to the degree of degradation;

[0028] 3. By setting up two ultraviolet detection units, the electrolyte in both the positive and negative electrode storage tanks can be detected simultaneously, which can improve the detection efficiency;

[0029] 4. By setting up a positive electrode pump, the positive electrode electrolyte in the positive electrode storage tank can be delivered to the ultraviolet detection unit or a bidirectional pump, which facilitates subsequent detection and recovery.

[0030] 5. By setting up a positive flow meter and using it in conjunction with a positive pump, the flow rate and injection time can be observed, enabling accurate sampling;

[0031] 6. By setting up a negative electrode pump, the negative electrode electrolyte in the negative electrode storage tank can be transported to the ultraviolet detection unit or a bidirectional pump, which facilitates subsequent detection and recovery.

[0032] 7. By setting up a negative electrode flow meter and using it in conjunction with a negative electrode pump, the flow rate and injection time can be observed, enabling accurate sampling. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the capacity monitoring and recovery device for the electrolyte of the vanadium redox flow battery of this utility model.

[0035] In the above figures, the meanings of each mark are as follows: 1-positive electrode storage tank, 2-ultraviolet detection unit, 3-negative electrode storage tank, 4-bidirectional pump, 5-positive electrode pump, 6-positive electrode flow meter, 7-first ball valve, 8-second ball valve, 9-negative electrode pump, 10-negative electrode flow meter, 11-third ball valve, 12-fourth ball valve. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments.

[0037] Example 1

[0038] The technical solution adopted in this embodiment is as follows:

[0039] like Figure 1 As shown, a capacity monitoring and recovery device for the electrolyte of a vanadium redox flow battery includes a positive electrode storage tank 1, one end of which is connected to an ultraviolet detection unit 2, and the other end of which is connected to a negative electrode storage tank 3. A bidirectional pump 4 is also connected between the positive electrode storage tank 1 and the negative electrode storage tank 3.

[0040] Working principle: First, the positive electrolyte in the positive electrode storage tank 1 is transported to the ultraviolet detection unit 2 to monitor the valence state of the electrolyte in real time. Then, the amount of negative electrolyte required to restore the positive electrolyte in the positive electrode storage tank 1 is calculated. Similarly, the negative electrolyte in the negative electrode storage tank 3 is transported to the ultraviolet detection unit 2 to monitor the valence state of the electrolyte in real time. Finally, the amount of positive electrolyte required to restore the negative electrolyte in the negative electrode storage tank 3 is calculated.

[0041] Based on the calculation results, the negative electrolyte in the negative electrode storage tank 3 is then transported to the positive electrode storage tank 1 through the bidirectional pump 4 to restore the electrolyte.

[0042] Alternatively, the positive electrolyte in the positive electrode storage tank 1 can be transported to the negative electrode storage tank 3 via a bidirectional pump 4 to restore the electrolyte.

[0043] By setting up the ultraviolet detection unit 2, the valence state information of the electrolyte can be monitored in real time, avoiding errors caused by offline sampling and measurement, and improving monitoring efficiency and accuracy.

[0044] By setting up a bidirectional pump 4, the positive or negative electrolyte can be restored according to the degree of attenuation.

[0045] Example 2

[0046] This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 1 As shown, based on Embodiment 1, the following improvement is disclosed: the ultraviolet detection unit 2 consists of two units.

[0047] By setting up two ultraviolet detection units 2, the electrolyte in the positive electrode storage tank 1 and the negative electrode storage tank 3 can be detected simultaneously, which can improve the detection efficiency.

[0048] Example 3

[0049] This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 1 As shown, based on Embodiment 2, the following improvements are disclosed: the positive electrode storage tank 1 is connected to a positive electrode pump 5, the positive electrode pump 5 is connected to a positive electrode flow meter 6, a first ball valve 7 is provided on the pipe of the ultraviolet detection unit 2 near the positive electrode flow meter 6, the first ball valve 7 prevents the electrolyte used for recovery from entering the ultraviolet detection unit 2, and a second ball valve 8 is provided on the side of the bidirectional pump 4 near the positive electrode storage tank 1, the second ball valve 8 is used to prevent the positive electrode electrolyte from entering the bidirectional pump 4 during detection.

[0050] By setting up the positive electrode pump 5, the positive electrode electrolyte in the positive electrode storage tank 1 can be transported to the ultraviolet detection unit 2 or the bidirectional pump 4, which facilitates subsequent detection and recovery.

[0051] By setting up a positive flow meter 6 and using it in conjunction with a positive pump 5, the flow rate and injection time can be observed, enabling accurate sampling.

[0052] Example 4

[0053] This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 1As shown, based on embodiment 3, the following improvements are disclosed: the negative electrode storage tank 3 is connected to a negative electrode pump 9, the negative electrode pump 9 is connected to a negative electrode flow meter 10, a third ball valve 11 is provided on the pipe of the ultraviolet detection unit 2 near the negative electrode flow meter 10, the third ball valve 11 prevents the electrolyte used for recovery from entering the ultraviolet detection unit 2, and a fourth ball valve 12 is provided on the side of the bidirectional pump 4 near the negative electrode storage tank 3, the fourth ball valve 12 is used to prevent the negative electrode electrolyte from entering the bidirectional pump 4 during detection.

[0054] By setting up the negative electrode pump 9, the negative electrode electrolyte in the negative electrode storage tank 3 can be transported to the ultraviolet detection unit 2 or the bidirectional pump 4, which facilitates subsequent detection and recovery.

[0055] By setting up a negative electrode flow meter 10 and using it in conjunction with a negative electrode pump 9, the flow rate and injection time can be observed, enabling accurate sampling.

[0056] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments based on the inspiration of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be determined by the claims, and the specification can be used to interpret the claims.

Claims

1. A capacity monitoring and recovery device for an all-vanadium redox flow battery electrolyte, characterized in that: It includes a positive electrode storage tank (1), one end of which is connected to an ultraviolet detection unit (2), and the other end of which is connected to a negative electrode storage tank (3). A bidirectional pump (4) is also connected between the positive electrode storage tank (1) and the negative electrode storage tank (3).

2. The capacity monitoring and recovery device for a vanadium redox flow battery electrolyte according to claim 1, characterized in that: There are two ultraviolet detection units (2), and one ultraviolet detection unit (2) is connected to each of the positive electrode storage tank (1) and the negative electrode storage tank (3).

3. The capacity monitoring and recovery device for a vanadium redox flow battery electrolyte according to claim 1 or 2, characterized in that: The positive electrode storage tank (1) is connected to a positive electrode pump (5).

4. The capacity monitoring and recovery device for a vanadium redox flow battery electrolyte according to claim 3, characterized in that: The positive pump (5) is connected to a positive flow meter (6).

5. The capacity monitoring and recovery device for a vanadium redox flow battery electrolyte according to claim 4, characterized in that: The ultraviolet detection unit (2) is provided with a first ball valve (7) on the pipe near the positive electrode flow meter (6). The first ball valve (7) prevents the electrolyte used for recovery from entering the ultraviolet detection unit (2).

6. The capacity monitoring and recovery device for a vanadium redox flow battery electrolyte according to claim 5, characterized in that: The bidirectional pump (4) is provided with a second ball valve (8) on the side near the positive electrode storage tank (1). The second ball valve (8) is used to prevent the positive electrode electrolyte from entering the bidirectional pump (4) during detection.

7. A capacity monitoring and recovery device for an all-vanadium redox flow battery electrolyte according to claim 1 or 2, characterized in that: The negative electrode storage tank (3) is connected to a negative electrode pump (9).

8. The capacity monitoring and recovery device for a vanadium redox flow battery electrolyte according to claim 7, characterized in that: The negative electrode pump (9) is connected to a negative electrode flow meter (10).

9. The capacity monitoring and recovery device for a vanadium redox flow battery electrolyte according to claim 8, characterized in that: A third ball valve (11) is provided on the pipe of the ultraviolet detection unit (2) near the negative electrode flow meter (10). The third ball valve (11) prevents the electrolyte used for recovery from entering the ultraviolet detection unit (2).

10. The capacity monitoring and recovery device for a vanadium redox flow battery electrolyte according to claim 9, characterized in that: The bidirectional pump (4) is provided with a fourth ball valve (12) on the side near the negative electrode storage tank (3). The fourth ball valve (12) is used to prevent the negative electrode electrolyte from entering the bidirectional pump (4) during detection.

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