SOC (State of Charge) detection device for all-vanadium redox flow battery

Abstract

The utility model relates to the technical field of redox flow batteries, in particular to an all-vanadium redox flow battery SOC (State of Charge) detection device which comprises a positive electrode liquid collecting cavity and a negative electrode liquid collecting cavity, a plurality of positive electrode liquid ports are formed in the periphery of the positive electrode liquid collecting cavity, a plurality of negative electrode liquid ports are formed in the periphery of the negative electrode liquid collecting cavity, the positive electrode liquid ports are communicated with a positive electrode electrolyte storage tank of an all-vanadium redox flow battery, and the negative electrode liquid ports are communicated with a negative electrode electrolyte storage tank of the all-vanadium redox flow battery. The anode liquid port is communicated with an anode electrolyte storage tank of the all-vanadium redox flow battery, the cathode liquid port is communicated with a cathode electrolyte storage tank of the all-vanadium redox flow battery, an ion conduction membrane is arranged between the anode liquid collection cavity and the cathode liquid collection cavity, a detection positive electrode and a detection negative electrode are respectively arranged in the end surfaces of the anode liquid collection cavity and the cathode liquid collection cavity, and the detection positive electrode and the detection negative electrode are electrically connected with the SOC acquisition module. A plurality of positive electrode liquid ports and negative electrode liquid ports are arranged in different directions, so that the problem that the SOC of the all-vanadium redox flow battery is difficult to truly and comprehensively reflect when the electrolyte is sampled at a single position is solved.

Description

Technical Field

[0001] This utility model relates to the field of flow battery technology, and in particular to a vanadium redox flow battery SOC detection device. Background Technology

[0002] Vanadium redox flow battery electrolyte storage tanks are typically large, and the electrolyte inside the tank exhibits a significant concentration gradient. Therefore, sampling the electrolyte at a single location during SOC testing of a vanadium redox flow battery is insufficient to accurately and comprehensively reflect its SOC. Furthermore, existing SOC testing devices are installed in relatively fixed locations, making it difficult to achieve online SOC monitoring at different locations within the vanadium redox flow battery. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a vanadium redox flow battery SOC detection device in response to the above-mentioned technical deficiencies. By setting multiple positive and negative electrode liquid ports in different positions, the device solves the problem that it is difficult to accurately and comprehensively reflect the SOC of the vanadium redox flow battery by sampling the electrolyte from a single position.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a vanadium redox flow battery SOC detection device, including a positive electrode collecting chamber and a negative electrode collecting chamber. The outer periphery of the positive electrode collecting chamber is provided with multiple positive electrode liquid ports, and the outer periphery of the negative electrode collecting chamber is provided with multiple negative electrode liquid ports. An ion-conducting membrane is provided between the positive electrode collecting chamber and the negative electrode collecting chamber. A detection positive electrode and a detection negative electrode are respectively provided in the end faces of the positive electrode collecting chamber and the negative electrode collecting chamber. The detection positive electrode and the detection negative electrode are electrically connected to the SOC acquisition module.

[0005] To further optimize this technical solution, the outer periphery of the positive electrode liquid collecting cavity and the negative electrode liquid collecting cavity is a multi-plane polygonal structure. The multiple positive electrode liquid ports of the positive electrode liquid collecting cavity are respectively set in the plane of the polygonal structure, and the multiple negative electrode liquid ports of the negative electrode liquid collecting cavity are respectively set in the plane of the corresponding polygonal structure.

[0006] To further optimize this technical solution, the outer periphery of the positive electrode liquid collecting cavity and the negative electrode liquid collecting cavity is a multi-planar octagonal structure.

[0007] To further optimize this technical solution, a pressure sleeve is provided on one side of the outer edge of the ion-conducting membrane, and an annular protrusion is provided on the other side of the pressure sleeve. The ion-conducting membrane is pressed between the pressure sleeve and the annular protrusion, and the annular protrusion is set in the inner wall of the negative electrode collecting cavity.

[0008] Compared with the prior art, this utility model has the following advantages: 1. The positive electrode liquid collecting chamber is connected to the positive electrode electrolyte storage tank through a pipeline via the positive electrode liquid port. By setting multiple positive electrode liquid ports, different positions of the positive electrode electrolyte storage tank can be connected simultaneously. By setting multiple negative electrode liquid collecting chambers, different positions of the negative electrode electrolyte storage tank can be connected simultaneously. This enables the mixing of electrolytes in the corresponding electrolyte storage tanks. At the same time, the SOC detection of the vanadium redox flow battery is realized through the set ion conduction membrane, detection positive electrode, and detection negative electrode pair. 2. Since the positive electrode liquid collecting chamber and the negative electrode liquid collecting chamber are octagonal structures, it is convenient to connect pipelines in different directions, making the layout more flexible. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the external structure of a vanadium redox flow battery SOC detection device.

[0010] Figure 2 A cross-sectional view of a vanadium redox flow battery SOC detection device;

[0011] Figure 3 This is an exploded schematic diagram of a vanadium redox flow battery SOC detection device.

[0012] In the diagram: 1. Positive electrode collecting chamber; 10. Detection positive electrode; 11. Positive electrode liquid port; 2. Negative electrode collecting chamber; 20. Detection negative electrode; 21. Negative electrode liquid port; 22. Annular boss; 3. Ion conduction membrane; 4. Pressure sleeve; 5. Bolt; 6. End cap. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0014] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" used in this application to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] Combination Figures 1 to 3As shown, a vanadium redox flow battery SOC detection device includes a positive electrode collecting chamber 1 and a negative electrode collecting chamber 2. The outer periphery of the positive electrode collecting chamber 1 and the negative electrode collecting chamber 2 is a multi-planar polygonal structure. In this embodiment, the outer periphery of the positive electrode collecting chamber 1 and the negative electrode collecting chamber 2 is a multi-planar octagonal structure.

[0016] The outer periphery of the positive electrode collecting chamber 1 is provided with multiple positive electrode liquid ports 11, and the outer periphery of the negative electrode collecting chamber 2 is provided with multiple negative electrode liquid ports 21. The multiple positive electrode liquid ports 11 of the positive electrode collecting chamber 1 are respectively arranged in the plane of the polygonal structure, and the multiple negative electrode liquid ports 21 of the negative electrode collecting chamber 2 are respectively arranged in the plane of the corresponding polygonal structure. Figure 2 The positive electrode liquid collecting chamber 1 and the negative electrode liquid collecting chamber 2 are each provided with a positive electrode liquid port 11 or a negative electrode liquid port 21 at their axial ends.

[0017] The positive electrode port 11 is connected to the positive electrolyte storage tank of the vanadium redox flow battery or connected in the positive electrolyte pipeline, indirectly connected to the positive electrolyte storage tank. The negative electrode port 21 is connected to the negative electrolyte storage tank of the vanadium redox flow battery or connected in the negative electrolyte pipeline, indirectly connected to the negative electrolyte storage tank. An ion-exchange membrane 3 is provided between the positive electrode collecting chamber 1 and the negative electrode collecting chamber 2. The ion-exchange membrane 3 can effectively isolate the positive and negative ion regions in the flow battery, preventing the substances generated in the two electrode regions from contacting and causing unnecessary chemical reactions. This isolation helps maintain the stability of the battery's internal structure and the purity of the electrolyte, providing a reliable electrochemical environment for accurate SOC detection, balancing charges, forming a closed loop, and achieving accurate SOC detection. A pressure sleeve 4 is provided on one side of the outer edge of the ion-exchange membrane 3, and an annular boss 22 is provided on the other side of the pressure sleeve 4. The pressure sleeve 4 is connected to the annular boss 22 by bolts 5.

[0018] The ion-conducting membrane 3 is pressed between the pressure sleeve 4 and the annular boss 22. The annular boss 22 is located in the inner wall of the negative electrode collecting chamber 2. The positive electrode collecting chamber 1 and the negative electrode collecting chamber 2 are connected by a thread.

[0019] The positive electrode 10 and the negative electrode 20 are respectively provided in the end faces of the positive electrode collecting chamber 1 and the negative electrode collecting chamber 2. The positive electrode 10 and the negative electrode 20 are electrically connected to the SOC acquisition module.

[0020] When using, combine Figures 1 to 3As shown, the positive electrode collecting chamber 1 is connected to the positive electrode electrolyte storage tank via a pipe through the positive electrode liquid port 11. By setting multiple positive electrode liquid ports 11, different positions of the positive electrode electrolyte storage tank can be connected simultaneously. Similarly, by setting multiple negative electrode collecting chambers 2, different positions of the negative electrode electrolyte storage tank can be connected simultaneously. This allows for the mixing of electrolytes in the corresponding electrolyte storage tanks while simultaneously detecting the potential difference between the two sides through the ion conduction membrane 3, the positive detection electrode 10, and the negative detection electrode 20. The detected potential difference is used by the SOC acquisition module to calculate the SOC value at the corresponding position, thus realizing the SOC detection of the vanadium redox flow battery. Since the positive electrode collecting chamber 1 and the negative electrode collecting chamber 2 are both octagonal structures, it is easy to connect pipes in different orientations. Each positive electrode liquid port 11 and each negative electrode liquid port 21 has a detachable end cap 6 at its opening, allowing for the selective use of positive electrode liquid ports 11 or negative electrode liquid ports 21 in different orientations, making the layout more flexible.

[0021] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A vanadium redox flow battery SOC detection device, characterized in that: The battery includes a positive electrode collecting chamber (1) and a negative electrode collecting chamber (2). The positive electrode collecting chamber (1) has multiple positive electrode ports (11) on its outer periphery, and the negative electrode collecting chamber (2) has multiple negative electrode ports (21) on its outer periphery. The positive electrode ports (11) are connected to the positive electrolyte storage tank of the vanadium redox flow battery, and the negative electrode ports (21) are connected to the negative electrolyte storage tank of the vanadium redox flow battery. An ion-conducting membrane (3) is provided between the positive electrode collecting chamber (1) and the negative electrode collecting chamber (2). A detection positive electrode (10) and a detection negative electrode (20) are respectively provided in the end faces of the positive electrode collecting chamber (1) and the negative electrode collecting chamber (2). The detection positive electrode (10) and the detection negative electrode (20) are electrically connected to the SOC acquisition module.

2. The vanadium redox flow battery SOC detection device according to claim 1, characterized in that: The outer periphery of the positive electrode liquid collecting cavity (1) and the negative electrode liquid collecting cavity (2) is a multi-plane polygonal structure. The plurality of positive electrode liquid ports (11) of the positive electrode liquid collecting cavity (1) are respectively arranged in the plane of the polygonal structure, and the plurality of negative electrode liquid ports (21) of the negative electrode liquid collecting cavity (2) are respectively arranged in the plane of the corresponding polygonal structure.

3. The vanadium redox flow battery SOC detection device according to claim 2, characterized in that: The outer periphery of the positive electrode collecting chamber (1) and the negative electrode collecting chamber (2) is a multi-planar octagonal structure.

4. The vanadium redox flow battery SOC detection device according to claim 1, characterized in that: The ion-conducting membrane (3) has a pressure sleeve (4) on one side of its outer edge, and an annular boss (22) on the other side of the pressure sleeve (4). The ion-conducting membrane (3) is pressed between the pressure sleeve (4) and the annular boss (22), and the annular boss (22) is located in the inner wall of the negative electrode liquid collecting cavity (2).

Images