Vanadium redox flow pile testing device

Abstract

The utility model relates to the technical field of vanadium redox flow galvanic piles, in particular to a vanadium redox flow galvanic pile testing device which comprises a bottom plate, a sensing element and a controller, the sensing element is electrically connected with the controller, a galvanic pile is arranged above the bottom plate, a positive electrode electrolyte liquid storage tank and a negative electrode electrolyte liquid storage tank are arranged on the bottom plate, and circulating conveying pump sets are correspondingly arranged on the positive electrode electrolyte liquid storage tank and the negative electrode electrolyte liquid storage tank. The pump set comprises a main pump and a secondary pump, and inlet and outlet pipelines of the main pump and the secondary pump are each provided with an electric three-way valve electrically connected with the controller. And the electric three-way valve of the inlet pipeline is communicated to the outlet of the corresponding liquid storage tank, a backflow pipeline is led out, the electric three-way valve of the outlet pipeline is communicated to the inlet pipeline of another main pump or secondary pump in the same circulating conveying pump set, the electric three-way valve of the outlet pipeline is communicated to the electrolyte inlet of the corresponding electric pile, and a bypass pipeline is led out from the electric three-way valve positioned on the outlet pipeline. By controlling the switching of the main pump and the secondary pump, the problems of electrolyte leakage and the like caused by an abnormal pump can be avoided, the normal operation of an experiment is maintained, and the accuracy and the reliability of a research result are ensured.

Description

Technical Field

[0001] This utility model relates to the field of vanadium liquid flow stack technology, and more specifically, to a testing device for vanadium liquid flow stacks. Background Technology

[0002] A vanadium redox battery is a redox battery that uses vanadium as the active material in a circulating liquid state. The electrical energy of the vanadium battery is stored as chemical energy in a sulfuric acid electrolyte containing vanadium ions of different valence states. An external circulating pump forces the electrolyte into the battery stack, where it circulates within different storage tanks and half-cells under mechanical power. A proton exchange membrane serves as the separator in the battery pack. The electrolyte solution flows parallel across the electrode surfaces, undergoing electrochemical reactions. Current is collected and conducted through dual electrode plates, thus achieving the interconversion of electrical and chemical energy, enabling the battery to charge and discharge.

[0003] Traditional vanadium redox flow stack test benches typically employ a single circulation pump design, with one pump for each of the positive and negative electrolyte storage tanks. This leads to several problems: Firstly, during long-term operation, the circulation pump may experience mechanical wear or seal failure due to continuous friction of mechanical components and corrosion from the electrolyte. Such failures not only reduce the pump's operating efficiency but may also cause electrolyte leakage, interrupting the experimental process and affecting the accuracy and reliability of the research results. Secondly, under high-flow-rate and high-pressure experimental conditions, a single circulation pump may not provide sufficient delivery capacity, resulting in inadequate electrolyte circulation and affecting the stack's reaction efficiency. Furthermore, the single circulation pump design lacks redundancy; if the pump fails, the entire experiment will be forced to stop, making continuous operation impossible. Utility Model Content

[0004] The purpose of this invention is to provide a testing device for vanadium liquid flow stacks, which can improve the reliability and flexibility of experiments while ensuring the stability of electrolyte circulation, thereby solving the technical problems pointed out in the background art.

[0005] This utility model is achieved through the following technical solution: a testing device for vanadium liquid flow stack, including a base plate, a sensing element and a controller, wherein the sensing element is electrically connected to the controller, and a support plate for placing the vanadium liquid flow stack is provided above the base plate, and the base plate has a liquid storage tank placement area and a circulation pump placement area.

[0006] The storage tank placement area is equipped with a positive electrolyte storage tank and a negative electrolyte storage tank. The circulation pump placement area is equipped with circulation pump sets corresponding to the positive electrolyte storage tank and the negative electrolyte storage tank. The circulation pump set includes a main circulation pump and a secondary circulation pump. The inlet and outlet pipes of the main circulation pump and the secondary circulation pump are equipped with electric three-way valves. The controller is electrically connected to the electric three-way valve.

[0007] The electric three-way valve located in the inlet pipe is connected to the outlet of the corresponding positive electrolyte storage tank or the outlet of the negative electrolyte storage tank via a common input pipe. A return pipe is led out from the electric three-way valve located in the inlet pipe and connected to the return pipe of the electric three-way valve of the inlet pipe of another circulating main pump or circulating secondary pump in the same circulating pump group. The electric three-way valve located in the outlet pipe is connected to the inlet of the corresponding vanadium liquid flow stack positive electrolyte or negative electrolyte via a common output pipe. A bypass pipe is led out from the electric three-way valve located in the outlet pipe. An air vent valve is provided on the bypass pipe. The sensing element is a speed sensor installed on the motor of the circulating main pump and the circulating secondary pump or a flow rate sensor installed on the common output pipe.

[0008] According to a preferred embodiment, the circulation pump placement area is located on one side of the storage tank placement area. The circulation pump placement area includes a pump mounting base for installing a circulation main pump and a circulation secondary pump. A first shock-absorbing pad is laid between the pump mounting base and the circulation main pump and the circulation secondary pump. The pump mounting base is fixedly connected to the base plate. A second shock-absorbing pad is laid between the pump mounting base and the base plate.

[0009] According to a preferred embodiment, in the electric three-way valve located in the inlet pipe, the inlet of the electric three-way valve is connected to the outlet of the common input pipe, the first outlet is connected to the inlet pipe of the corresponding circulating main pump or circulating secondary pump, and the second outlet is connected to the inlet of the return pipe.

[0010] In the electrically operated three-way valve located in the outlet pipeline, the inlet of the electrically operated three-way valve is connected to the outlet pipeline of the corresponding circulating main pump or circulating secondary pump, the first outlet is connected to the inlet of the common output pipeline, and the second outlet is connected to the inlet of the bypass pipeline.

[0011] According to a preferred embodiment, the base plate further includes a waste liquid placement area, in which a positive electrode waste liquid tank and a negative electrode waste liquid tank are disposed, and the inlets of the positive electrode waste liquid tank and the negative electrode waste liquid tank are connected to the outlets of corresponding bypass pipes.

[0012] According to a preferred embodiment, the vanadium liquid flow stack is covered with a top cover, and the top cover has a pipe through hole and an air inlet.

[0013] According to a preferred embodiment, the top cover is made of a transparent material.

[0014] According to a preferred embodiment, the pallet is supported on the base plate by vertically arranged columns at intervals, and the columns are provided with pipe restraint components.

[0015] According to a preferred embodiment, the bottom of the base plate is supported by a plurality of rollers.

[0016] The technical solution of the vanadium liquid flow stack test device provided by this utility model has at least the following advantages and beneficial effects: (1) By using the speed sensor installed on the motor of the circulating main pump and the circulating secondary pump or the flow rate sensor installed on the common output pipe to detect abnormalities of the circulating pump, and then controlling the switching of the main pump and the secondary pump, problems such as electrolyte leakage caused by abnormal circulating pumps can be avoided, the normal progress of the experiment can be maintained, and the accuracy and reliability of the research results can be ensured; (2) By adding the circulating secondary pump, the test device has multi-stage pumping capability, which can meet the reliability evaluation requirements under different working conditions. Attached Figure Description

[0017] Figure 1 A schematic diagram of the pipe connection for the testing device of the vanadium liquid flow stack provided in Embodiment 1 of this utility model;

[0018] Figure 2 A schematic diagram of the pipe connection for the test device of the vanadium liquid flow stack provided in Embodiment 3 of this utility model. Detailed Implementation

[0019] 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Example 1

[0021] See Figure 1 This utility model provides a testing device for a vanadium liquid flow stack, including a base plate, a sensing element, and a controller. The sensing element is electrically connected to the controller. A support plate for placing the vanadium liquid flow stack is provided above the base plate. The base plate has a liquid storage tank placement area and a circulation pump placement area.

[0022] The storage tank placement area is equipped with a positive electrolyte storage tank and a negative electrolyte storage tank. The circulation pump placement area is equipped with circulation pump sets corresponding to the positive electrolyte storage tank and the negative electrolyte storage tank. The circulation pump set includes a main circulation pump and a secondary circulation pump. The inlet and outlet pipes of the main circulation pump and the secondary circulation pump are equipped with electric three-way valves. The controller is electrically connected to the electric three-way valve.

[0023] The electric three-way valve located in the inlet pipe is connected to the outlet of the corresponding positive electrolyte storage tank or the outlet of the negative electrolyte storage tank via a common input pipe. A return pipe is led out from the electric three-way valve located in the inlet pipe and connected to the return pipe of the electric three-way valve of the inlet pipe of another circulating main pump or circulating secondary pump in the same circulating pump group. The electric three-way valve located in the outlet pipe is connected to the inlet of the corresponding vanadium liquid flow stack positive electrolyte or negative electrolyte via a common output pipe. A bypass pipe is led out from the electric three-way valve located in the outlet pipe. An air vent valve is provided on the bypass pipe. The sensing element is a speed sensor installed on the motor of the circulating main pump and the circulating secondary pump or a flow rate sensor installed on the common output pipe.

[0024] Furthermore, in this embodiment, in the electric three-way valve located in the inlet pipe, the inlet of the electric three-way valve is connected to the outlet of the common input pipe, the first outlet is connected to the inlet pipe of the corresponding circulating main pump or circulating secondary pump, and the second outlet is connected to the inlet of the return pipe.

[0025] In the electrically operated three-way valve located in the outlet pipeline, the inlet of the electrically operated three-way valve is connected to the outlet pipeline of the corresponding circulating main pump or circulating secondary pump, the first outlet is connected to the inlet of the common output pipeline, and the second outlet is connected to the inlet of the bypass pipeline.

[0026] Specifically, the working principle of the vanadium redox flow stack testing device is as follows:

[0027] When the speed sensor installed on the main pump motor detects an abnormal motor speed or the flow rate sensor installed on the common output pipeline detects an abnormal flow rate, it sends an electrical signal to the controller. Upon receiving the electrical signal, the controller shuts down the main pump and opens the vent valve of the electric three-way valve on the outlet pipeline of the main pump to drain the electrolyte solution in the outlet pipeline of the main pump. After the electrolyte solution is drained, the secondary pump is started and the return valve of the electric three-way valve on the inlet pipeline of the main pump is opened to open the return pipeline. The electrolyte solution in the inlet pipeline of the main pump is then guided through the return pipeline to the return pipeline of the electric three-way valve on the inlet pipeline of the secondary pump in the same pump group. The secondary pump then pumps the electrolyte solution into the corresponding vanadium liquid flow stack positive or negative electrolyte inlet.

[0028] Similarly, when the speed sensor installed on the secondary pump motor detects an abnormal motor speed or the flow rate sensor installed on the common output pipe detects an abnormal flow rate, it sends an electrical signal to the controller. Upon receiving the electrical signal, the controller shuts down the secondary pump and opens the vent valve of the electric three-way valve on the outlet pipe of the secondary pump to drain the electrolyte solution in the outlet pipe of the secondary pump. After the electrolyte solution is drained, the main pump is turned on and the return valve of the electric three-way valve on the inlet pipe of the secondary pump is opened to open the return pipe. The electrolyte solution in the inlet pipe of the secondary pump is then guided through the return pipe to the return pipe of the electric three-way valve on the inlet pipe of the main pump in the same pump group. The main pump then pumps the electrolyte solution into the corresponding vanadium liquid stack positive or negative electrolyte inlet.

[0029] In addition, when high flow rate and high pressure experimental conditions are required, the main circulation pump and the secondary circulation pump are turned on simultaneously to provide electrolyte solution with faster flow rate and pressure to the fuel cell stack through a common output pipeline, thereby creating high flow rate and high pressure experimental conditions.

[0030] The vanadium liquid flow stack testing device provided by this invention detects abnormalities in the circulating pump by using speed sensors installed on the motors of the main and secondary circulating pumps or flow rate sensors installed on the common output pipeline. This allows for control of the switching between the main and secondary pumps, avoiding problems such as electrolyte leakage caused by abnormal circulating pumps, maintaining the normal progress of experiments, and ensuring the accuracy and reliability of research results. Furthermore, by adding a secondary circulating pump, the testing device possesses multi-stage pumping capabilities, thereby meeting the reliability evaluation requirements under different operating conditions.

[0031] Example 2

[0032] This embodiment, based on the technical solution provided in Embodiment 1, further explains the placement area of ​​the circulating transfer pump and the placement area of ​​the storage tank:

[0033] In some embodiments, the circulation pump placement area is located on one side of the storage tank placement area. The circulation pump placement area includes a pump mounting base for mounting the main circulation pump and the secondary circulation pump. A first damping pad is laid between the pump mounting base and the main and secondary circulation pumps. The pump mounting base is fixedly connected to a base plate, and a second damping pad is laid between the pump mounting base and the base plate. Specifically, by setting the first and second damping pads, the vibration generated by the main and secondary circulation pumps during operation can be effectively prevented from being transmitted to the base plate, thus preventing damage to the internal components of the testing device due to excessive vibration.

[0034] The storage tank placement area has two oppositely arranged recesses, each housing a positive and negative electrolyte storage tank. Specifically, by providing these recesses, the positive and negative electrolyte storage tanks can be fixedly installed in the storage tank placement area, maintaining a relatively stationary state and preventing movement, thus improving the overall stability of the vanadium liquid battery stack testing device. Furthermore, the shape of the recesses ensures appropriate spacing between the positive and negative electrolyte storage tanks, preventing collisions or other accidents. In addition, the depth of the recesses can be adjusted according to actual needs to accommodate electrolyte storage tanks of different sizes.

[0035] Furthermore, as a feasible implementation, the storage tank placement area is surrounded by a fence, which has a certain height, though no specific limit is placed on the height. Specifically, the advantage of this arrangement is that when the electrolyte solution in the positive and negative electrolyte storage tanks overflows, it can be intercepted in time, preventing it from falling directly outside the testing device.

[0036] Example 3

[0037] This embodiment is based on the technical solution provided in Embodiment 1, and provides relevant explanations regarding the waste liquid collection design:

[0038] In some embodiments, the base plate further includes a waste liquid storage area, in which a positive electrode waste liquid tank and a negative electrode waste liquid tank are disposed. See [link to relevant documentation]. Figure 2 As shown, the inlets of the positive and negative electrode waste liquid tanks are connected to the outlets of the corresponding bypass pipes. Specifically, by adding positive and negative electrode waste liquid tanks, waste liquid can be recycled, reducing resource waste and preventing environmental pollution caused by waste liquid leakage.

[0039] Example 4

[0040] This embodiment is based on the technical solution provided in Embodiment 1, and provides relevant explanations regarding fuel cell stack protection:

[0041] In some embodiments, the vanadium liquid flow fuel cell is covered with a top cover, which has pipe through holes and air inlets. Specifically, by adding a top cover to the fuel cell, the risk of electric shock to experimental personnel during fuel cell operation can be reduced, and the influence of ambient temperature on the fuel cell operating temperature can be reduced, maintaining the fuel cell operating temperature within the normal range.

[0042] In some embodiments, the top cover is made of a transparent material, which facilitates the observation of the vanadium liquid flow stack's operating status by experimental personnel, allowing for timely detection of abnormalities and the implementation of appropriate measures.

[0043] Example 5

[0044] This embodiment, based on the technical solution provided in Embodiment 1, further explains the frame structure of the testing device:

[0045] In some embodiments, the support plate is supported on the base plate by vertically arranged columns at intervals, and the columns are equipped with pipe restraint components. Specifically, the pipe restraint components facilitate the arrangement of relevant pipes and prevent pipes from becoming loose or falling off.

[0046] In some embodiments, the bottom of the base plate is supported by multiple rollers. Specifically, the bottom rollers facilitate the movement of the vanadium liquid flow stack testing device, expanding its applicability.

[0047] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A testing apparatus for a vanadium liquid flow stack, characterized in that, It includes a base plate, a sensing element, and a controller. The sensing element is electrically connected to the controller. A support plate for placing a vanadium liquid flow stack is provided above the base plate. The base plate has a storage tank placement area and a circulation pump placement area. The storage tank placement area is equipped with a positive electrolyte storage tank and a negative electrolyte storage tank. The circulation pump placement area is equipped with circulation pump sets corresponding to the positive electrolyte storage tank and the negative electrolyte storage tank. The circulation pump set includes a main circulation pump and a secondary circulation pump. The inlet and outlet pipes of the main circulation pump and the secondary circulation pump are equipped with electric three-way valves. The controller is electrically connected to the electric three-way valve. The electric three-way valve located in the inlet pipe is connected to the outlet of the corresponding positive electrolyte storage tank or the outlet of the negative electrolyte storage tank via a common input pipe. A return pipe is led out from the electric three-way valve located in the inlet pipe and connected to the return pipe of the electric three-way valve of the inlet pipe of another circulating main pump or circulating secondary pump in the same circulating pump group. The electric three-way valve located in the outlet pipe is connected to the inlet of the corresponding vanadium liquid flow stack positive electrolyte or negative electrolyte via a common output pipe. A bypass pipe is led out from the electric three-way valve located in the outlet pipe. An air vent valve is provided on the bypass pipe. The sensing element is a speed sensor installed on the motor of the circulating main pump and the circulating secondary pump or a flow rate sensor installed on the common output pipe.

2. The testing apparatus for a vanadium liquid flow stack as described in claim 1, characterized in that, The circulation pump placement area is located on one side of the storage tank placement area. The circulation pump placement area includes a pump mounting base for installing the main circulation pump and the secondary circulation pump. A first shock-absorbing pad is laid between the pump mounting base and the main circulation pump and the secondary circulation pump. The pump mounting base is fixedly connected to the base plate. A second shock-absorbing pad is laid between the pump mounting base and the base plate.

3. The testing apparatus for a vanadium liquid flow stack as described in claim 1, characterized in that, In the electric three-way valve located in the inlet pipe, the inlet of the electric three-way valve is connected to the outlet of the common input pipe, the first outlet is connected to the inlet pipe of the corresponding circulating main pump or circulating secondary pump, and the second outlet is connected to the inlet of the return pipe. In the electrically operated three-way valve located in the outlet pipeline, the inlet of the electrically operated three-way valve is connected to the outlet pipeline of the corresponding circulating main pump or circulating secondary pump, the first outlet is connected to the inlet of the common output pipeline, and the second outlet is connected to the inlet of the bypass pipeline.

4. The testing apparatus for a vanadium liquid flow stack as described in claim 1, characterized in that, The base plate also has a waste liquid placement area, in which a positive electrode waste liquid tank and a negative electrode waste liquid tank are installed. The inlets of the positive electrode waste liquid tank and the negative electrode waste liquid tank are connected to the outlets of the corresponding bypass pipes.

5. The testing apparatus for a vanadium liquid flow stack as described in claim 1, characterized in that, The vanadium liquid flow stack is covered with a top cover, which has pipe through holes and air inlets.

6. The testing apparatus for a vanadium liquid flow stack as described in claim 5, characterized in that, The top cover is made of a transparent material.

7. The testing apparatus for a vanadium liquid flow stack as described in claim 1, characterized in that, The pallet is supported on the base plate by vertically arranged columns at intervals, and the columns are equipped with pipe restraint components.

8. The testing apparatus for a vanadium liquid flow stack as described in claim 1, characterized in that, The bottom of the base plate is supported by multiple rollers.

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