Device and system for testing air tightness of redox flow battery stack

Abstract

The utility model discloses an air tightness testing device and an air tightness testing system for a redox flow battery stack. The gas tightness testing device of the flow battery stack comprises a gas transmission module used for outputting gas; the pipe joint tool is connected between the gas transmission module and the flow battery electric pile, and the pipe joint tool is used for inputting the gas into the flow battery electric pile and keeping the gas input into the flow battery electric pile for a first preset time; the pressure intensity detection module is connected between the gas transmission module and the pipe joint tool, and the pressure intensity detection module is used for inputting the gas into the flow battery electric pile through the pipe joint tool and detecting the initial pressure intensity of the gas input into the flow battery electric pile and the test pressure intensity after a first preset time; and according to the difference between the initial pressure intensity and the test pressure intensity, judging the leakage state of the redox flow battery electric pile. According to the technical scheme provided by the embodiment of the utility model, the problem that the air tightness detection effect is poor is solved.

Description

Technical Field

[0001] This utility model relates to the field of flow battery technology, and in particular to a flow battery stack airtightness testing device and system. Background Technology

[0002] The fuel cell stack is a core component of energy conversion devices such as flow batteries, and its performance directly affects the energy conversion efficiency and stability of the entire system. Poor airtightness of the fuel cell stack can lead to leakage of the reaction liquid, which not only reduces energy conversion efficiency but may also cause safety hazards. Therefore, airtightness testing of the fuel cell stack is a necessary step to ensure its performance and safety. However, existing airtightness testing devices are complex to operate, have low accuracy in airtightness assessment, and poor testing results. Utility Model Content

[0003] This invention provides a device and system for testing the airtightness of flow battery stacks to solve the problem of poor airtightness testing results.

[0004] According to one aspect of the present invention, a flow battery stack airtightness testing device is provided, comprising:

[0005] The gas delivery module is used to output gas;

[0006] A pipe fitting fixture is connected between the gas delivery module and the flow battery stack. The pipe fitting fixture is used to input the gas into the flow battery stack and maintain it for a first preset time.

[0007] A pressure detection module is connected between the gas delivery module and the pipe fitting fixture. The pressure detection module is used to input the gas into the flow battery stack through the pipe fitting fixture, and to detect the initial pressure of the gas input into the flow battery stack and the test pressure after a first preset time; and to determine the leakage status of the flow battery stack based on the difference between the initial pressure and the test pressure.

[0008] Optionally, the flow battery stack includes: a first liquid inlet and a first liquid outlet; the first liquid inlet and the first liquid outlet are connected inside the flow battery stack;

[0009] The pipe fitting fixture includes: a first sealed pipe fitting and a first vent pipe fitting fixture; the first sealed pipe fitting is connected to the first liquid outlet and is used to seal the first liquid outlet; the first vent pipe fitting fixture is connected between the first liquid inlet and the pressure detection module, and the pressure detection module is used to input the gas into the first liquid inlet through the first vent pipe fitting fixture.

[0010] Optionally, the pressure detection module includes a pressure sensor and a controller. A first pipeline is connected between the gas delivery module and the second pipeline. The second pipeline is also connected to the pipe fitting fixture. The pressure sensor is disposed in the second pipeline, and the controller is connected to the pressure sensor. The gas output by the gas delivery module is input into the second pipeline through the first pipeline and into the first liquid inlet through the second pipeline.

[0011] The pressure sensor of the pressure detection module is used to collect the first initial pressure of the gas input into the first liquid inlet and the first test pressure after a first preset time.

[0012] The controller of the pressure detection module is used to generate a first pressure based on the difference between the first initial pressure and the first test pressure; and to determine that the flow battery stack has internal leakage when the first pressure is greater than the first pressure threshold.

[0013] Optionally, the flow battery stack further includes: a second liquid inlet and a second liquid outlet; the second liquid inlet and the second liquid outlet are connected inside the flow battery stack;

[0014] The pipe fitting fixture further includes: a second sealed pipe fitting and a second vent pipe fitting fixture; the second sealed pipe fitting is connected to the second liquid outlet and is used to seal the second liquid outlet; the second vent pipe fitting fixture is connected between the second liquid inlet and the pressure detection module, and the pressure detection module is used to input the gas into the second liquid inlet through the second vent pipe fitting fixture.

[0015] Optionally, the first pipeline is connected between the gas delivery module and the third pipeline, the third pipeline is also connected to the pipe fitting fixture, and the pressure sensor is also disposed in the third pipeline; the gas output by the gas delivery module is input into the third pipeline through the first pipeline, and then input into the second liquid inlet through the third pipeline;

[0016] The pressure sensor is used to collect the second initial pressure of the gas input to the second liquid inlet and the second test pressure after a first preset time.

[0017] The controller is used to generate a second pressure based on the difference between the second initial pressure and the second test pressure; and to determine that the flow battery stack has internal leakage when the second pressure is greater than the second pressure threshold.

[0018] Optionally, the gas output by the gas delivery module is input into the second pipeline and the third pipeline through the first pipeline, and into the first liquid inlet through the second pipeline, and into the second liquid inlet through the third pipeline;

[0019] The pressure sensor is used to collect the third initial pressure of the gas input to the first liquid inlet and the third test pressure after a first preset time; it is also used to collect the fourth initial pressure of the gas input to the second liquid inlet and the fourth test pressure after a first preset time.

[0020] The controller is configured to generate a third pressure based on the difference between the third initial pressure and the third test pressure; and to generate a fourth pressure based on the difference between the fourth initial pressure and the fourth test pressure; and to determine that the flow battery stack has leaked if the third pressure is greater than the third pressure threshold and / or the fourth pressure is greater than the third pressure threshold.

[0021] Optionally, the first vent pipe fitting tooling includes: a first pipe fitting and a first vent fitting;

[0022] The outlet end of the first pipe connector is used for air discharge, the inlet end of the first pipe connector is connected to the outlet end of the first vent connector, and the first vent connector is connected to the pressure detection module.

[0023] The air inlet end of the first pipe joint is heat-fused to the air outlet end of the first vent joint.

[0024] Optionally, the second vent pipe fitting tooling includes: a second pipe fitting and a second vent fitting;

[0025] The outlet end of the second pipe connector is used for air discharge, the inlet end of the second pipe connector is connected to the outlet end of the second vent connector, and the second vent connector is connected to the pressure detection module.

[0026] The air inlet end of the second pipe joint is heat-fused to the air outlet end of the second vent joint.

[0027] Optionally, the pressure detection module includes: an airtightness detector;

[0028] The gas delivery module includes an air compressor.

[0029] According to another aspect of the present invention, a flow battery stack air tightness testing system is provided, comprising: a power supply and an air tightness testing device for a flow battery stack provided in any embodiment of the present invention.

[0030] This invention enables the airtightness testing of flow battery stacks by interconnecting the gas delivery module, pressure detection module, and pipe fitting fixture. The invention features a simple structure, convenient operation, and accurate assessment of airtightness through pressure changes, demonstrating good testing performance.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the airtightness testing device for a flow battery stack according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of another flow battery stack air tightness testing device provided according to an embodiment of the present utility model;

[0035] Figure 3 This is a schematic diagram of the structure of another flow battery stack air tightness testing device provided according to an embodiment of the present utility model;

[0036] Figure 4 This is a structural schematic diagram of a first vent pipe connector tooling provided according to an embodiment of the present utility model. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] This invention provides a device for testing the airtightness of a flow battery stack. Figure 1 This is a schematic diagram of a flow battery stack airtightness testing device provided in an embodiment of the present invention. (Reference) Figure 1 The device includes: a gas delivery module 1, a pipe fitting fixture 3, and a pressure detection module 2. The gas delivery module 1 is used to output gas. The pipe fitting fixture 3 is connected between the gas delivery module 1 and the flow battery stack 4, and is used to input gas into the flow battery stack 4 and maintain it for a first preset time. The pressure detection module 2 is connected between the gas delivery module 1 and the pipe fitting fixture 3, and is used to input gas into the flow battery stack 4 through the pipe fitting fixture 3, and detect the initial pressure of the gas input into the flow battery stack 4 and the test pressure after the first preset time; and determine the leakage state of the flow battery stack 4 based on the difference between the initial pressure and the test pressure.

[0040] Before being put into operation, the flow battery stack 4 has no electrolyte flowing inside. By filling the flow battery stack 4 with gas and detecting the change in gas pressure inside the flow battery stack 4, it can be determined whether the flow battery stack 4 is in a leaking state.

[0041] Specifically, the gas supply module 1 can be set to a fixed gas pressure and charges the flow battery stack 4 with gas through the pressure detection module 2. When the output gas pressure reaches the set value, the gas supply module 1 stops supplying gas. The pipe fitting fixture 3 can be connected to the liquid inlet and liquid outlet of the flow battery stack 4 and seal the liquid outlet. The gas output from the gas supply module 1 can be input into the liquid inlet of the flow battery stack 4 through the pipe fitting fixture 3, and then sealed inside the flow battery stack 4.

[0042] Because the gas delivery module 1 delivers gas at a relatively fast rate, the gas inside the flow battery stack 4 is in an unstable state when the gas delivery module 1 stops outputting gas, and the gas pressure may change over time. To ensure the accuracy of the airtightness test results, the gas pressure can be measured only after the gas has completely stabilized. For example, the pressure detection module 2 can perform an airtightness test 45 seconds after the gas delivery module 1 stops outputting gas. The airtightness test can last for 100 seconds. If the pressure change in the pressure detection module 2 is less than a set value within 100 seconds, it indicates that the flow battery stack 4 has not leaked.

[0043] This invention enables the airtightness testing of flow battery stacks by interconnecting the gas delivery module, pressure detection module, and pipe fitting fixture. The invention features a simple structure, convenient operation, and accurate assessment of airtightness through pressure changes, demonstrating good testing performance.

[0044] Figure 2 This is a schematic diagram of another flow battery stack airtightness testing device provided in an embodiment of the present invention. (Reference) Figure 2 Based on the above embodiments, optionally, the flow battery stack includes: a first liquid inlet 41 and a first liquid outlet 42; the first liquid inlet 41 and the first liquid outlet 42 are connected inside the flow battery stack 4. The pipe fitting fixture 3 includes: a first sealed pipe fitting 31 and a first vent pipe fitting fixture 32; the first sealed pipe fitting 31 is connected to the first liquid outlet 42 and is used to seal the first liquid outlet 42; the first vent pipe fitting fixture 32 is connected between the first liquid inlet 41 and the pressure detection module 2, and the pressure detection module 2 is used to input gas into the first liquid inlet through the first vent pipe fitting fixture 32.

[0045] For example, the first inlet 41 and the first outlet 42 can be connected through the anode cavity within the flow battery stack 4. The first inlet 41 of the flow battery stack 4 can be used to input the anode electrolyte, which flows out through the anode cavity of the flow battery stack 4 and the first outlet 42. Therefore, the side where the first inlet 41 and the first outlet 42 are located can be used as the anode side of the flow battery stack 4.

[0046] During the airtightness test, the first sealed pipe joint 31 seals the first liquid outlet 42, and the first vent pipe joint fixture 32 is connected to the first liquid inlet 41. At this time, the gas output from the gas delivery module 1 can be input into the first liquid inlet 41 through the pressure detection module 2. Because the first liquid outlet 42 remains closed, the internal gas pressure of the flow battery stack 4 should remain stable when gas is input through the first liquid inlet 41. This configuration allows for the determination of the airtightness of the anode side of the flow battery stack 4.

[0047] Figure 3This is a schematic diagram of the structure of another flow battery stack airtightness testing device provided in an embodiment of this utility model. (Combined with...) Figure 2 and Figure 3 Based on the above embodiments, optionally, the pressure detection module 2 includes a pressure sensor 21 and a controller 22. A first pipeline 51 is connected between the gas delivery module 1 and the second pipeline 52. The second pipeline 52 is also connected to a pipe fitting fixture 3. The pressure sensor 21 is disposed in the second pipeline 52, and the controller 22 is connected to the pressure sensor 21. The gas output from the gas delivery module 1 is input into the second pipeline 52 through the first pipeline 51 and then into the first liquid inlet 41 through the second pipeline 52. The pressure sensor 21 of the pressure detection module 2 is used to collect the first initial pressure of the gas input into the first liquid inlet 41 and the first test pressure after a first preset time. The controller 22 of the pressure detection module 2 is used to generate a first pressure based on the difference between the first initial pressure and the first test pressure; and if the first pressure is greater than a first pressure threshold, it determines that internal leakage has occurred in the flow battery stack 4.

[0048] The gas delivery module 1, pressure detection module 2, and pipe fitting fixture 3 are connected by pipelines. When the first sealed pipe fitting 31 seals the first liquid outlet 42 and the first vent pipe fitting fixture 32 is connected to the first liquid inlet 41, the gas output from the gas delivery module 1 can be input into the first liquid inlet 41 through the second pipeline 52. The pressure detected by the pressure sensor 21 in the second pipeline 52 is the gas pressure between the first liquid inlet 41 and the first liquid outlet 42.

[0049] For example, the gas delivery module 1 can modulate the output gas pressure to 0.7 MPa. This gas can generate a certain pressure in the anode cavity of the flow battery stack 4. After a pressure stabilization time of 45 seconds, the pressure sensor 21 detects the gas pressure between the first inlet 41 and the first outlet 42 and collects the first initial pressure. The first test pressure is collected again after a first preset time. For example, the first preset time can be 100 seconds. If, after 100 seconds, the change in gas pressure between the first inlet 41 and the first outlet 42 is less than the first pressure threshold, it indicates that the flow battery stack 4 has good airtightness. The first pressure threshold can be 0.0002 psi. When the change in gas pressure between the first inlet 41 and the first outlet 42 is greater than the first pressure threshold, it indicates that the gas between the first inlet 41 and the first outlet 42 may have seeped into the cathode cavity of the flow battery stack 4, that is, internal leakage has occurred in the flow battery stack 4.

[0050] Continue to refer to Figure 2Based on the above embodiments, optionally, the flow battery stack further includes: a second liquid inlet 43 and a second liquid outlet 44; the second liquid inlet 43 and the second liquid outlet 44 are connected inside the flow battery stack 4. The pipe fitting fixture 3 further includes: a second sealed pipe fitting 33 and a second vent pipe fitting fixture 34; the second sealed pipe fitting 33 is connected to the second liquid outlet 44 and is used to seal the second liquid outlet 44; the second vent pipe fitting fixture 34 is connected between the second liquid inlet 43 and the pressure detection module 2, and the pressure detection module 2 is used to input gas into the second liquid inlet 43 through the second vent pipe fitting fixture 34.

[0051] For example, the second inlet 43 and the second outlet 44 can be connected through the cathode cavity within the flow battery stack 4. The second inlet 43 of the flow battery stack 4 can be used to input cathode electrolyte, which flows out through the cathode cavity of the flow battery stack 4 and the second outlet 44. Therefore, the side containing the second inlet 43 and the second outlet 44 can serve as the cathode side of the flow battery stack 4.

[0052] During the airtightness test, the second sealed pipe joint 33 seals the second liquid outlet 44, and the second vent pipe joint fixture 34 is connected to the second liquid inlet 43. At this time, the gas output from the gas delivery module 1 can be input into the second liquid inlet 43 through the pressure detection module 2. Because the second liquid outlet 44 remains closed, the internal gas pressure of the flow battery stack 4 should remain stable when gas is input through the second liquid inlet 43. This configuration allows for the determination of the airtightness of the cathode side of the flow battery stack 4.

[0053] Continue to combine Figure 2 and Figure 3 Based on the above embodiments, optionally, the first pipeline 51 is connected between the gas delivery module 1 and the third pipeline 53, the third pipeline 53 is also connected to the pipe fitting fixture 3, and the pressure sensor 21 is also disposed in the third pipeline 53; the gas output from the gas delivery module 1 is input into the third pipeline 53 through the first pipeline 51, and then into the second liquid inlet 43 through the third pipeline 53. The pressure sensor 21 is used to collect the second initial pressure of the gas input into the second liquid inlet 43 and the second test pressure after a first preset time. The controller 22 is used to generate a second pressure based on the difference between the second initial pressure and the second test pressure; and if the second pressure is greater than the second pressure threshold, it determines that the flow battery stack 4 has internal leakage.

[0054] Specifically, when the second sealed pipe joint 33 seals the second liquid outlet 44 and the second vent pipe joint fixture 34 is connected to the second liquid inlet 43, the gas output by the gas delivery module 1 can be input into the second liquid inlet 43 through the third pipe 53. The pressure detected by the pressure sensor 21 in the third pipe 53 is the gas pressure between the first liquid inlet 41 and the first liquid outlet 42.

[0055] For example, the gas delivery module 1 can modulate the output gas pressure to 0.7 MPa. This gas can generate a certain pressure in the cathode cavity of the flow battery stack 4. After a pressure stabilization time of 45 seconds, the pressure sensor 21 detects the gas pressure between the second inlet 43 and the second outlet 44 and collects the second initial pressure. The collection of the second test pressure continues after a second preset time. For example, the second preset time can be the same as the first preset time, both being 100 seconds. If, after 100 seconds, the change in gas pressure between the second inlet 43 and the second outlet 44 is less than the second pressure threshold, it indicates that the flow battery stack 4 has good airtightness. The second pressure threshold can be the same as the first pressure threshold, both being 0.0002 psi. When the change in gas pressure between the second inlet 43 and the second outlet 44 is greater than the second pressure threshold, it indicates that the gas between the second inlet 43 and the second outlet 44 may have seeped into the anode cavity of the flow battery, that is, the flow battery stack 4 has internal leakage.

[0056] In actual leak testing, pressure testing can be performed only between the first inlet 41 and the first outlet 42 to determine whether internal leakage has occurred in the flow battery stack 4. Further pressure testing between the second inlet 43 and the second outlet 44 can effectively improve the testing accuracy.

[0057] Continue to combine Figure 2 and Figure 3 Based on the above embodiments, optionally, the gas output from the gas delivery module 1 is input into the second pipeline 52 and the third pipeline 53 through the first pipeline 51, and into the first liquid inlet 41 through the second pipeline 52, and into the second liquid inlet 43 through the third pipeline 53. The pressure sensor 21 is used to collect the third initial pressure of the gas input into the first liquid inlet 41 and the third test pressure after a first preset time; it is also used to collect the fourth initial pressure of the gas input into the second liquid inlet 43 and the fourth test pressure after a first preset time. The controller 22 is used to generate a third pressure based on the difference between the third initial pressure and the third test pressure; it is also used to generate a fourth pressure based on the difference between the fourth initial pressure and the fourth test pressure; and it determines that the flow battery stack 4 has leaked when the third pressure is greater than the third pressure threshold and / or the fourth pressure is greater than the third pressure threshold.

[0058] Specifically, when the first sealed pipe joint 31 seals the first liquid outlet 42, the second sealed pipe joint 33 seals the second liquid outlet 44, the first vent pipe joint fixture 32 is connected to the first liquid inlet 41, and the second vent pipe joint fixture 34 is connected to the second liquid inlet 43, the gas output by the gas delivery module 1 can be input into the first liquid inlet 41 through the second pipe 52, and can also be input into the second liquid inlet 43 through the third pipe 53. At this time, the gas delivery module 1 can simultaneously supply gas to the first liquid inlet 41 and the second liquid inlet 43.

[0059] For example, the second pipe 52 and the third pipe 53 can be pipes with the same cross-sectional area, so the flow rate of gas output from them is the same. Since the first liquid inlet 41 and the second liquid inlet 43 are supplied with gas from the same gas delivery module 1, that is, the third initial pressure and the fourth test pressure can be the same pressure, the third test pressure and the fourth test pressure after the first preset time should also be the same pressure.

[0060] Ideally, the pressure at the first inlet 41 and the second inlet 43 detected by the pressure sensor 21 are the same, meaning that the internal pressure of the flow battery stack 4 is uniform, and internal leakage of the flow battery stack 4 cannot be detected. If the third pressure is greater than the third pressure threshold, or the fourth pressure is greater than the third pressure threshold, it indicates that external leakage has occurred in the flow battery stack 4, meaning that the flow battery stack 4 is leaking gas to the outside.

[0061] Because the severity of internal leakage in the flow battery stack 4 is greater than that of external leakage, a third pressure threshold greater than the first pressure threshold can be set. For example, this threshold could be 0.0005 psi.

[0062] Figure 4 This is a structural schematic diagram of a first vent pipe connector tooling provided in an embodiment of the present utility model. Continuing with... Figure 2 and Figure 4 Based on the above embodiments, optionally, the first vent pipe fitting fixture 32 includes: a first pipe fitting 322 and a first vent fitting 321. The outlet end of the first pipe fitting 322 is used for venting, the inlet end of the first pipe fitting 322 is connected to the outlet end of the first vent fitting 321, and the first vent fitting 321 is connected to the pressure detection module 2. The inlet end of the first pipe fitting 322 and the outlet end of the first vent fitting 321 are heat-fused together.

[0063] In this method, by heat-fusion connecting the air inlet end of the first pipe connector 322 with the air outlet end of the first vent connector 321, the heat-fusion connection has advantages over the traditional threaded connection method, such as simple connection, long service life, and resistance to corrosion. The heat-fusion connection of the first pipe connector 322 and the first vent connector 321 has better integration, resulting in a lower leakage rate for the first vent pipe connector fixture 32, thereby improving the accuracy of the airtightness test.

[0064] Based on the above embodiments, optionally, the second vent pipe fitting fixture includes: a second pipe fitting and a second vent fitting. The outlet end of the second pipe fitting is used for venting, the inlet end of the second pipe fitting is connected to the outlet end of the second vent fitting, and the second vent fitting is connected to the pressure detection module. The inlet end of the second pipe fitting and the outlet end of the second vent fitting are heat-fused together.

[0065] The second vent pipe connector fixture has the same structure as the first vent pipe connector fixture, both using a heat fusion connection. Heat fusion connection offers high reliability, resulting in a lower leakage rate for the second vent pipe connector fixture and thus improving the accuracy of the airtightness test.

[0066] Continue to refer to Figure 2 Based on the above embodiments, optionally, the pressure detection module 2 includes an airtightness detector. The gas delivery module 1 includes an air compressor.

[0067] An air compressor is a device that generates compressed air, which can compress air or other gases and deliver them through pipes. For example, the air compressor can be set to a certain pressure value and stop gas output when the flow battery stack reaches the set pressure.

[0068] The airtightness tester can test products with pre-reserved test ports. It primarily uses dry compressed air as the medium. During the airtightness test, air is introduced and pressurized into the flow battery stack through the liquid inlet to determine if any leakage has occurred. By calculating the pressure change of the flow battery stack, the airtightness of the stack can be determined.

[0069] This utility model embodiment also provides an airtightness testing system for a flow battery stack. The system includes a power supply and the airtightness testing device for a flow battery stack provided in any embodiment of this utility model, possessing similar beneficial effects to the airtightness testing device for a flow battery stack, which will not be described in detail here.

[0070] The power supply can be used to power the pressure detection module and the gas delivery module, providing them with the necessary power for normal operation.

[0071] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0072] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for testing the airtightness of a flow battery stack, characterized in that, include: The gas delivery module is used to output gas; A pipe fitting fixture is connected between the gas delivery module and the flow battery stack. The pipe fitting fixture is used to input the gas into the flow battery stack and maintain it for a first preset time. A pressure detection module is connected between the gas delivery module and the pipe fitting fixture. The pressure detection module is used to input the gas into the flow battery stack through the pipe fitting fixture, and to detect the initial pressure of the gas input into the flow battery stack and the test pressure after a first preset time; and to determine the leakage status of the flow battery stack based on the difference between the initial pressure and the test pressure.

2. The airtightness testing device for a flow battery stack according to claim 1, characterized in that, The flow battery stack includes: a first liquid inlet and a first liquid outlet; the first liquid inlet and the first liquid outlet are connected inside the flow battery stack. The pipe fitting fixture includes: a first sealed pipe fitting and a first vent pipe fitting fixture; the first sealed pipe fitting is connected to the first liquid outlet and is used to seal the first liquid outlet; the first vent pipe fitting fixture is connected between the first liquid inlet and the pressure detection module, and the pressure detection module is used to input the gas into the first liquid inlet through the first vent pipe fitting fixture.

3. The airtightness testing device for a flow battery stack according to claim 2, characterized in that, The pressure detection module includes a pressure sensor and a controller. A first pipeline is connected between the gas delivery module and the second pipeline. The second pipeline is also connected to the pipe fitting fixture. The pressure sensor is disposed in the second pipeline, and the controller is connected to the pressure sensor. The gas output by the gas delivery module is input into the second pipeline through the first pipeline and into the first liquid inlet through the second pipeline. The pressure sensor of the pressure detection module is used to collect the first initial pressure of the gas input into the first liquid inlet and the first test pressure after a first preset time. The controller of the pressure detection module is used to generate a first pressure based on the difference between the first initial pressure and the first test pressure; and to determine that the flow battery stack has internal leakage when the first pressure is greater than the first pressure threshold.

4. The airtightness testing device for a flow battery stack according to claim 3, characterized in that, The flow battery stack further includes: a second liquid inlet and a second liquid outlet; the second liquid inlet and the second liquid outlet are connected inside the flow battery stack. The pipe fitting fixture further includes: a second sealed pipe fitting and a second vent pipe fitting fixture; the second sealed pipe fitting is connected to the second liquid outlet and is used to seal the second liquid outlet; the second vent pipe fitting fixture is connected between the second liquid inlet and the pressure detection module, and the pressure detection module is used to input the gas into the second liquid inlet through the second vent pipe fitting fixture.

5. The airtightness testing device for a flow battery stack according to claim 4, characterized in that, The first pipeline is connected between the gas delivery module and the third pipeline. The third pipeline is also connected to the pipe fitting fixture. The pressure sensor is also installed in the third pipeline. The gas output by the gas delivery module is input into the third pipeline through the first pipeline and then into the second liquid inlet through the third pipeline. The pressure sensor is used to collect the second initial pressure of the gas input to the second liquid inlet and the second test pressure after a first preset time. The controller is used to generate a second pressure based on the difference between the second initial pressure and the second test pressure; and to determine that the flow battery stack has internal leakage when the second pressure is greater than the second pressure threshold.

6. The airtightness testing device for a flow battery stack according to claim 5, characterized in that, The gas output by the gas delivery module is input into the second pipeline and the third pipeline through the first pipeline, and into the first liquid inlet through the second pipeline, and into the second liquid inlet through the third pipeline; The pressure sensor is used to collect the third initial pressure of the gas input to the first liquid inlet and the third test pressure after a first preset time; it is also used to collect the fourth initial pressure of the gas input to the second liquid inlet and the fourth test pressure after a first preset time. The controller is configured to generate a third pressure based on the difference between the third initial pressure and the third test pressure; and to generate a fourth pressure based on the difference between the fourth initial pressure and the fourth test pressure; and to determine that the flow battery stack has leaked if the third pressure is greater than the third pressure threshold and / or the fourth pressure is greater than the third pressure threshold.

7. The airtightness testing device for a flow battery stack according to claim 2, characterized in that, The first vent pipe fitting tooling includes: a first pipe fitting and a first vent fitting; The outlet end of the first pipe connector is used for air discharge, the inlet end of the first pipe connector is connected to the outlet end of the first vent connector, and the first vent connector is connected to the pressure detection module. The air inlet end of the first pipe joint is heat-fused to the air outlet end of the first vent joint.

8. The airtightness testing device for a flow battery stack according to claim 4, characterized in that, The second vent pipe fitting tooling includes: a second pipe fitting and a second vent fitting; The outlet end of the second pipe connector is used for air discharge, the inlet end of the second pipe connector is connected to the outlet end of the second vent connector, and the second vent connector is connected to the pressure detection module. The air inlet end of the second pipe joint is heat-fused to the air outlet end of the second vent joint.

9. The airtightness testing device for a flow battery stack according to claim 1, characterized in that, The pressure detection module includes: an airtightness detector; The gas delivery module includes an air compressor.

10. A system for testing the airtightness of a flow battery stack, characterized in that, include: The power supply and the airtightness testing apparatus for the flow battery stack as described in any one of claims 1-9.

Images