Vanadium redox flow battery performance testing device

Abstract

The utility model discloses a vanadium redox flow battery performance testing device which comprises an electric pile which is composed of n single batteries connected in series. A positive electrode electrolyte circulating device is arranged between the positive electrode electrolyte inlet and the positive electrode electrolyte outlet of the electric pile, and a negative electrode electrolyte circulating device is arranged between the negative electrode electrolyte inlet and the negative electrode electrolyte outlet of the electric pile; an energy storage converter PCS is connected between the positive electrode and the negative electrode of the electric pile through a wire; the vanadium redox flow battery performance testing device further comprises an acquisition module, the input end of the acquisition module is connected with the positive electrode and the negative electrode of each single battery through wires, the output end of the acquisition module is electrically connected with a controller, the output end of the controller is electrically connected with an output module, and the output end of the output module is electrically connected with the PCS. According to the utility model, the voltage signal of each single battery is effectively acquired through the acquisition module, so that the actual state of the interior of each single battery is fed back, specific problems in a galvanic pile are found in advance, and the purpose of early-stage inspection is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vanadium redox flow batteries and relates to a performance testing device for vanadium redox flow batteries. Background Art

[0002] The technical solutions for vanadium flow battery performance testing in the existing technology only test the efficiency and leakage of the entire battery. The internal structure of the battery stack and the uniformity of the crimping are not verified in the early stage of the testing process of the newly manufactured battery. During the charging and discharging process, the uniformity of the crimping and the amount of compression of the crimping will affect the uniformity of the electrolyte inside the vanadium flow battery. The electrolyte with poor uniformity may have a "dead zone", resulting in an increase in the internal resistance of the single cell, and then an increase in the single cell voltage, causing the vanadium flow battery to fail to operate at the designed power density, and even causing internal heat, which will eventually burn out the battery stack. Therefore, it is necessary to detect the voltage of the single cell in the vanadium flow battery in the early stage of the vanadium flow battery test. The voltage status of the single cell can reflect whether the internal structure of the battery is intact, so as to achieve the purpose of protecting the vanadium flow battery, improving the test and improving the efficiency of the vanadium flow battery. Utility Model Content

[0003] The utility model aims to provide a vanadium redox flow battery performance testing device, which solves the problem in the prior art that the internal structure of the battery stack and whether the crimping is uniform are not verified in the early stage of the new battery test process.

[0004] The technical solution adopted by this utility model is:

[0005] The vanadium flow battery performance test device includes a stack composed of n series-connected single cells; a positive electrode electrolyte circulation device is provided between the positive electrode electrolyte inlet and the positive electrode electrolyte outlet of the stack; a negative electrode electrolyte circulation device is provided between the negative electrode electrolyte inlet and the negative electrode electrolyte outlet of the stack; an energy storage converter PCS is connected between the positive and negative electrodes of the stack via a wire;

[0006] It also includes an acquisition module, the input end of the acquisition module is connected to the positive and negative wires of each single battery, the output end of the acquisition module is electrically connected to the controller, the output end of the controller is electrically connected to the output module, and the output end of the output module is electrically connected to the energy storage converter PCS.

[0007] The utility model is also characterized in that:

[0008] The vanadium liquid flow battery performance testing device has a data comparison operation module in the controller.

[0009] Vanadium flow battery performance test device,

[0010] The positive electrode electrolyte circulation device includes a positive electrode liquid tank, which is connected to the positive electrode electrolyte inlet and the positive electrode electrolyte outlet through pipelines, and a positive electrode quantitative pump is provided on the pipeline between the positive electrode liquid tank and the positive electrode electrolyte inlet;

[0011] The negative electrode electrolyte circulation device includes a negative electrode liquid tank, which is connected to the negative electrode electrolyte inlet and the negative electrode electrolyte outlet through pipelines. A negative electrode quantitative pump is provided on the pipeline between the negative electrode liquid tank and the negative electrode electrolyte inlet.

[0012] The vanadium liquid flow battery performance testing device has an output module output end electrically connected to the positive electrode metering pump and the negative electrode metering pump.

[0013] The beneficial effects of the utility model are:

[0014] 1. The present invention implements autonomous testing of vanadium flow battery performance by providing a controller, an acquisition module, and an output module. During the charge and discharge process of the vanadium flow battery, the acquisition module effectively collects the voltage signal of each single cell, thereby providing feedback on the actual internal status of each single cell, allowing early detection of specific problems in the battery stack and achieving the purpose of early testing. If the voltage of a single cell deviates significantly, the controller performs a voltage comparison operation and issues a command to the output module. The output module then executes a voltage reduction or shutdown command on the energy storage converter PCS to protect the battery stack from burning out.

[0015] 2. The device of the utility model can monitor and determine the internal conditions of each single cell in the vanadium flow battery in real time, record test data, flexibly control the energy storage converter of the vanadium flow battery, predict the status of the battery stack in advance, ensure its normal testing, and improve the upgrade and transformation efficiency of the vanadium flow battery. It has high reliability, real-time performance and intelligence, and has broad application prospects and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the utility model;

[0017] Figure 2 It is a structural diagram of the utility model;

[0018] Figure 3 It is a control principle diagram of the present utility model.

[0019] In the figure, 1. Battery stack, 2. Single cell, 3. Positive electrolyte inlet, 4. Positive electrolyte outlet, 5. Positive electrolyte circulation device, 6. Negative electrolyte inlet, 7. Negative electrolyte outlet, 8. Negative electrolyte circulation device, 9. Energy storage converter PCS, 10. Acquisition module, 11. Controller, 12. Output module, 13. Positive liquid tank, 14. Positive dosing pump, 15. Negative liquid tank, 16. Negative dosing pump. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0021] The utility model provides a vanadium redox flow battery performance test device, such as Figure 1 As shown, it includes a battery stack 1, which is composed of n single batteries 2 connected in series;

[0022] A positive electrode electrolyte circulation device 5 is provided between the positive electrode electrolyte inlet 3 and the positive electrode electrolyte outlet 4 of the battery stack 1. Figure 2 As shown, the positive electrode electrolyte circulation device 5 includes a positive electrode liquid tank 13, which is connected to the positive electrode electrolyte inlet 3 and the positive electrode electrolyte outlet 4 through pipelines. A positive electrode metering pump 14 is provided on the pipeline between the positive electrode liquid tank 13 and the positive electrode electrolyte inlet 3; under the action of the positive electrode metering pump 14, the positive electrode electrolyte circulates between the positive electrode liquid tank 13 and the positive electrode of the battery stack 1, forming a positive electrode electrolyte closed loop;

[0023] A negative electrode electrolyte circulation device 8 is provided between the negative electrode electrolyte inlet 6 and the negative electrode electrolyte outlet 7 of the battery stack 1; Figure 2 As shown, the negative electrode electrolyte circulation device 8 includes a negative electrode liquid tank 15, which is connected to the negative electrode electrolyte inlet 6 and the negative electrode electrolyte outlet 7 through pipelines. A negative electrode metering pump 16 is provided on the pipeline between the negative electrode liquid tank 15 and the negative electrode electrolyte inlet 6; under the action of the negative electrode metering pump 16, the negative electrode electrolyte circulates between the negative electrode liquid tank 15 and the negative electrode of the stack 1, forming a negative electrode electrolyte closed loop;

[0024] An energy storage converter PCS 9 is connected between the positive electrode and the negative electrode of the battery stack 1 via a wire; the function of the energy storage converter PCS 9 is to control the charging and discharging process of the vanadium redox flow battery.

[0025] like Figure 3 As shown, the vanadium liquid flow battery performance test device also includes an acquisition module 10. The input end of the acquisition module 10 is connected to the positive and negative electrode wires of each single cell 2 to realize real-time acquisition of voltage data of each single cell 2; the output end of the acquisition module 10 is electrically connected to the controller 11, and the controller 11 is provided with a data comparison operation module. The output end of the controller 11 is electrically connected to the output module 12. The acquisition module 10 transmits the collected voltage data of each single cell 2 to the controller 11. After being processed by the data comparison operation module in the controller 11, the signal is output to the output module 12; the output end of the output module 12 is electrically connected to the energy storage converter PCS 9, the positive electrode metering pump 14 and the negative electrode metering pump 16. The output module 12 is used to control the operating mode of the energy storage converter PCS 9 and the operation of the positive electrode metering pump 14 and the negative electrode metering pump 16.

[0026] The working principle is:

[0027] The controller 11 sends an opening instruction to the output module 12, thereby starting the positive electrode metering pump 14 and the negative electrode metering pump 16, and at the same time starting the energy storage converter PCS 9 in constant current mode for charging or discharging. In this process, the real-time single cell voltage of each single cell 2 is collected by the acquisition module 10, and the voltage data is transmitted to the controller 11. The data comparison and operation module in the controller 11 compares and calculates with the voltage setting value, and outputs a signal to the output module 12. The output module 12 controls the operation mode of the energy storage converter PCS 9, and can also control the operation of the positive electrode metering pump 14 and the negative electrode metering pump 16, so as to always ensure that the voltage of all single cells 2 in the vanadium liquid flow battery system is within the set safe voltage value range. If the safe voltage value is exceeded, the controller 11 sends an energy storage converter PCS 9 adjustment signal to the output module 12, thereby adjusting the energy storage converter PCS 9 performs voltage reduction or shutdown operations and records and stores data. When necessary, the controller 11 can also send a shutdown signal to the output module 12 to shut down the positive electrode metering pump 14 or the negative electrode metering pump 16, thereby shutting down the positive electrode metering pump 14 or the negative electrode metering pump 16. By promptly shutting down the vanadium flow battery, the vanadium flow battery is protected.

[0028] The utility model performs a difference operation on the single cell voltage data and the voltage set value, and obtains the performance of each single cell of the stack by analyzing the operation data, and then infers the installation condition and overall performance of the stack, thereby improving the testing efficiency of the vanadium liquid flow battery, and ultimately improving the improvement efficiency of the vanadium liquid flow battery and shortening the improvement cycle.

[0029] Example 1

[0030] The utility model provides a vanadium redox flow battery performance test device, such as Figure 1 As shown, the stack 1 comprises n single cells 2 connected in series; a positive electrolyte circulation device 5 is provided between the positive electrolyte inlet 3 and the positive electrolyte outlet 4 of the stack 1, and a negative electrolyte circulation device 8 is provided between the negative electrolyte inlet 6 and the negative electrolyte outlet 7 of the stack 1; an energy storage converter PCS 9 is connected between the positive and negative electrodes of the stack 1 via a wire;

[0031] The vanadium liquid flow battery performance test device also includes an acquisition module 10, the input end of the acquisition module 10 is connected to the positive and negative electrode wires of each single battery 2, the output end of the acquisition module 10 is electrically connected to the controller 11, and the controller 11 is provided with a data comparison operation module. The output end of the controller 11 is electrically connected to the output module 12, and the output end of the output module 12 is electrically connected to the energy storage converter PCS 9.

[0032] Example 2

[0033] On the basis of Example 1, the positive electrode electrolyte circulation device 5 includes a positive electrode liquid tank 13, which is connected to the positive electrode electrolyte inlet 3 and the positive electrode electrolyte outlet 4 through pipes, and a positive electrode metering pump 14 is provided on the pipe between the positive electrode liquid tank 13 and the positive electrode electrolyte inlet 3;

[0034] The negative electrode electrolyte circulation device 8 includes a negative electrode liquid tank 15, which is connected to the negative electrode electrolyte inlet 6 and the negative electrode electrolyte outlet 7 through pipelines. A negative electrode metering pump 16 is provided on the pipeline between the negative electrode liquid tank 15 and the negative electrode electrolyte inlet 6.

[0035] Example 3

[0036] On the basis of Example 2, the output end of the output module 12 is electrically connected to the positive electrode metering pump 14 and the negative electrode metering pump 16 .

Claims

1. A vanadium flow battery performance test device, characterized in that: The invention comprises a battery stack (1), wherein the battery stack (1) is composed of n series-connected single cells (2); a positive electrode electrolyte circulation device (5) is provided between a positive electrode electrolyte inlet (3) and a positive electrode electrolyte outlet (4) of the battery stack (1); a negative electrode electrolyte circulation device (8) is provided between a negative electrode electrolyte inlet (6) and a negative electrode electrolyte outlet (7) of the battery stack (1); and an energy storage converter PCS (9) is connected between the positive electrode and the negative electrode of the battery stack (1) via a wire; The system further comprises a collection module (10), wherein the input end of the collection module (10) is connected to the positive and negative lead wires of each of the single cells (2), the output end of the collection module (10) is electrically connected to a controller (11), the output end of the controller (11) is electrically connected to an output module (12), and the output end of the output module (12) is electrically connected to an energy storage converter PCS (9).

2. The vanadium flow battery performance testing device according to claim 1, characterized in that: The controller (11) is provided with a data comparison operation module.

3. The vanadium redox flow battery performance testing device according to claim 1 or claim 2, characterized in that: The positive electrode electrolyte circulation device (5) includes a positive electrode liquid tank (13), which is connected to the positive electrode electrolyte inlet (3) and the positive electrode electrolyte outlet (4) through pipelines, and a positive electrode quantitative pump (14) is provided on the pipeline between the positive electrode liquid tank (13) and the positive electrode electrolyte inlet (3); The negative electrode electrolyte circulation device (8) comprises a negative electrode liquid tank (15), which is connected to a negative electrode electrolyte inlet (6) and a negative electrode electrolyte outlet (7) through pipelines, and a negative electrode dosing pump (16) is provided on the pipeline between the negative electrode liquid tank (15) and the negative electrode electrolyte inlet (6).

4. The vanadium flow battery performance testing device according to claim 3, characterized in that: The output end of the output module (12) is electrically connected to the positive electrode quantitative pump (14) and the negative electrode quantitative pump (16).

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