Fuel cell air tightness testing device and testing method thereof

Abstract

The present invention discloses a fuel cell air tightness test device and a test method thereof, which relates to the technical field of fuel cell air tightness test. The device comprises: a first manual pressure reducing valve, a first explosion-proof solenoid valve, a first flow controller, a first three-way solenoid valve, and a first connecting pipe connected in sequence; a first water tank connected in the middle to the first three-way solenoid valve; a third manual pressure reducing valve, a fourth explosion-proof solenoid valve, a second flow controller, a second three-way solenoid valve, and a third connecting pipe connected in sequence; a second water tank connected in the middle to the second three-way solenoid valve; a second manual pressure reducing valve connected to the air inlet ends of the second and third explosion-proof solenoid valves; a test piece placement area disposed at the air outlet ends of the first and third connecting pipes; and a first exhaust pipe and a second exhaust pipe disposed on one side of the test piece placement area. The present application is convenient to use and can accurately measure the leakage of fuel cell cells, effectively solving practical production problems.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell air tightness testing, and in particular to a fuel cell air tightness testing device and a testing method thereof. Background Art

[0002] Hydrogen, as the fuel for hydrogen fuel cells, is flammable and explosive. Especially in a confined space, even a tiny hydrogen leak may cause a huge disaster and affect battery performance.

[0003] Fuel cell performance testing is an indispensable part of the test, and airtightness testing is an important part of ensuring the safety of fuel cells. Most of the fuel cell airtightness detection devices currently available on the market can only use one gas for detection, and cannot quickly switch between different gases for detection, let alone use temperature-sensitive gases for detection. For example, CN111579173B only uses a flow meter as a component for detecting leaks. The designed components are complex and cannot automatically save data, which greatly limits the accuracy and efficiency of the test. CN114608766A only optimizes the pressure-maintaining method, which makes it more complicated. It is impossible to automatically switch between different gases for testing, and it is impossible to achieve the scenario during actual use. CN114608766A only optimizes the pressure-maintaining method, and cannot use temperature-sensitive gases for pressure-maintaining testing, and it is impossible to achieve the scenario during actual use.

[0004] Existing invention patents cannot meet the airtightness requirements for various temperatures and gases in actual use, so there is an urgent need for improved technologies on the market to solve the above problems.

[0005] Therefore, in order to meet actual needs, a fuel cell air tightness testing technology is now provided. Summary of the Invention

[0006] In response to the defects in the prior art, the purpose of the present invention is to provide a fuel cell air tightness testing device and a testing method thereof, which have a reasonable structure, are easy to use, and have accurate measurement results. They can accurately measure the leakage of single fuel cell cells, have a wide range of applications, and effectively solve actual production problems.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0008] In a first aspect, the present application provides a fuel cell air tightness testing device, the device comprising:

[0009] A first manual pressure reducing valve, a first explosion-proof solenoid valve, a first flow controller, a first three-way solenoid valve and a first connecting pipe connected in sequence;

[0010] a first water tank whose middle portion is connected to the first three-way solenoid valve, and whose top portion is connected to the first connecting pipe;

[0011] A third manual pressure reducing valve, a fourth explosion-proof solenoid valve, a second flow controller, a second three-way solenoid valve and a third connecting pipe connected in sequence;

[0012] a second water tank whose middle portion is connected to the second three-way solenoid valve, and whose top portion is connected to the third connecting pipe;

[0013] a second manual pressure-reducing valve, connected to the air inlet ends of the second explosion-proof solenoid valve and the third explosion-proof solenoid valve, an air outlet end of the second explosion-proof solenoid valve being connected to the connecting pipe between the first explosion-proof solenoid valve and the first flow controller, and an air outlet end of the third explosion-proof solenoid valve being connected to the connecting pipe between the fourth explosion-proof solenoid valve and the second flow controller;

[0014] a DUT placement area disposed at the gas outlet ends of the first communicating pipe and the third communicating pipe;

[0015] The first exhaust pipe and the second exhaust pipe are arranged on one side of the DUT placement area; wherein,

[0016] A heating belt is provided around the first water tank, the first connecting pipe, the second water tank, the third connecting pipe and the DUT placement area.

[0017] On the basis of the above technical solution, the device further includes:

[0018] A controller is respectively connected to the first explosion-proof solenoid valve, the first flow controller, the first three-way solenoid valve, the fourth explosion-proof solenoid valve, the second flow controller, the second three-way solenoid valve, the second explosion-proof solenoid valve, the third explosion-proof solenoid valve and the heating belt signal.

[0019] On the basis of the above technical solution, the first water tank, the first connecting pipe, the second water tank and the third connecting pipe are all equipped with temperature sensors;

[0020] The temperature sensor is signal-connected to the controller.

[0021] On the basis of the above technical solution, the first connecting pipe and the third connecting pipe are both equipped with pressure sensors;

[0022] The pressure sensor is signal-connected to the controller.

[0023] On the basis of the above technical solution, a temperature sensor of the sample to be tested is arranged on the area where the piece to be tested is placed.

[0024] On the basis of the above technical solution, a first exhaust valve is provided at one end of the first exhaust pipe close to the DUT placement area;

[0025] A second exhaust valve is provided at one end of the second exhaust pipe close to the DUT placement area.

[0026] On the basis of the above technical solution, the device further includes:

[0027] A host computer connected to the controller signal.

[0028] In a second aspect, the present application provides a testing method for the fuel cell air tightness testing device mentioned in the first aspect, the testing method comprising the following steps:

[0029] Obtain the test temperature, test humidity, hydrogen flow rate and air flow rate of the sample to be tested;

[0030] Placing the sample to be tested in the test piece placement area, and connecting the first connecting pipe, the third connecting pipe, the first exhaust pipe, and the second exhaust pipe to the sample to be tested;

[0031] Controlling the heating belt to regulate the temperature of the first water tank, the first connecting pipe, the second water tank, the third connecting pipe, and the test piece placement area so that the water temperature of the first water tank and the second water tank, the internal temperature of the first connecting pipe and the third connecting pipe, and the external temperature of the test piece all match the test temperature;

[0032] Dispatching hydrogen and air to enter the first explosion-proof solenoid valve and the fourth explosion-proof solenoid valve after the pressure is reduced to a first manual pressure reduction threshold through the first manual pressure reduction valve and the third manual pressure reduction valve respectively;

[0033] Opening the first explosion-proof solenoid valve and the fourth explosion-proof solenoid valve to allow hydrogen to enter the first flow controller and air to enter the second flow controller, and configuring corresponding flow control parameters for the first flow controller and the second flow controller;

[0034] In response to a preset moisture signal, the first three-way solenoid valve and the second three-way solenoid valve are controlled so that hydrogen enters the first water tank and then enters the sample to be tested, and air enters the second water tank and then enters the sample to be tested;

[0035] closing the first exhaust pipe and the second exhaust pipe, and when the air pressure inside the first connecting pipe and the third connecting pipe reaches a preset first air pressure threshold, closing the first explosion-proof solenoid valve and the fourth explosion-proof solenoid valve;

[0036] Within a preset first observation time, the air pressure drop values ​​of the first connecting tube and the third connecting tube are identified. If the air pressure drop value is not greater than the preset first air pressure drop threshold, the air tightness of the sample to be tested is determined to be qualified; otherwise, the air tightness of the sample to be tested is determined to be unqualified.

[0037] On the basis of the above technical solution, the method further comprises the following steps:

[0038] Close the first explosion-proof solenoid valve and the fourth explosion-proof solenoid valve, and open the second explosion-proof solenoid valve and the third explosion-proof solenoid valve;

[0039] Dispatching nitrogen gas to pass through the second explosion-proof solenoid valve and the third explosion-proof solenoid valve to the first flow controller and the second flow controller;

[0040] configuring corresponding nitrogen flow control parameters to the first flow controller and the second flow controller respectively;

[0041] In response to a preset dry gas signal, the first three-way solenoid valve and the second three-way solenoid valve are controlled to allow nitrogen to enter the sample to be tested;

[0042] closing the first exhaust pipe and the second exhaust pipe, and when the air pressure inside the first connecting pipe and the third connecting pipe reaches a preset first air pressure threshold, closing the first explosion-proof solenoid valve and the fourth explosion-proof solenoid valve;

[0043] Within a preset first observation time, the air pressure drop values ​​of the first connecting tube and the third connecting tube are identified. If the air pressure drop value is not greater than the preset first air pressure drop threshold, the air tightness of the sample to be tested is determined to be qualified; otherwise, the air tightness of the sample to be tested is determined to be unqualified.

[0044] In a third aspect, the present application further provides another testing method for the fuel cell air tightness testing device mentioned in the first aspect, the testing method comprising the following steps:

[0045] Placing the sample to be tested in the test piece placement area, and connecting the first connecting pipe, the third connecting pipe, the first exhaust pipe, and the second exhaust pipe to the sample to be tested;

[0046] The nitrogen is dispatched to enter the second explosion-proof solenoid valve and the third explosion-proof solenoid valve after being reduced in pressure to a first manual pressure reduction threshold through the second manual pressure reduction valve;

[0047] Opening the second explosion-proof solenoid valve and the third explosion-proof solenoid valve to allow nitrogen to flow to the first flow controller and the second flow controller;

[0048] configuring corresponding nitrogen flow control parameters to the first flow controller and the second flow controller respectively;

[0049] In response to a preset dry gas signal, the first three-way solenoid valve and the second three-way solenoid valve are controlled to allow nitrogen to enter the sample to be tested;

[0050] closing the first exhaust pipe and the second exhaust pipe, and when the air pressure inside the first connecting pipe and the third connecting pipe reaches a preset first air pressure threshold, closing the first explosion-proof solenoid valve and the fourth explosion-proof solenoid valve;

[0051] Within a preset first observation time, the air pressure drop values ​​of the first connecting tube and the third connecting tube are identified. If the air pressure drop value is not greater than the preset first air pressure drop threshold, the air tightness of the sample to be tested is determined to be qualified; otherwise, the air tightness of the sample to be tested is determined to be unqualified.

[0052] Compared with the prior art, the advantages of the present invention are:

[0053] The fuel cell air tightness testing device provided by the present invention has a reasonable structure, is easy to use, and provides accurate measurement results. It can accurately measure the leakage of a single fuel cell, has a wide range of applications, and effectively solves practical production problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0055] Figure 1 Schematic diagram of the structure of a fuel cell air tightness testing device according to an embodiment of the present invention;

[0056] In the figure: 10, first manual pressure reducing valve; 11, first explosion-proof solenoid valve; 12, first flow controller; 13, first three-way solenoid valve; 14, first water tank; 15, first connecting pipe; 20, second manual pressure reducing valve; 21, second explosion-proof solenoid valve; 22, third explosion-proof solenoid valve; 30, third manual pressure reducing valve; 31, fourth explosion-proof solenoid valve; 32, second flow controller; 33, second three-way solenoid valve; 34, second water tank; 35, third connecting pipe; 4, test piece placement area; 40, test sample temperature sensor; 5, first exhaust pipe; 50, first exhaust valve; 6, second exhaust pipe; 60, second exhaust valve; 7, heating belt; 8, controller; 9, host computer; T, temperature sensor; P, pressure sensor. DETAILED DESCRIPTION

[0057] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0059] The embodiment of the present application provides a fuel cell air tightness testing device and a testing method thereof, which have a reasonable structure, are easy to use, and have accurate measurement results. They can accurately measure the leakage of a single fuel cell, have a wide range of applications, and effectively solve actual production problems.

[0060] To achieve the above technical effects, the overall idea of ​​this application is as follows:

[0061] A fuel cell air tightness testing device, comprising:

[0062] A first manual pressure reducing valve 10, a first explosion-proof solenoid valve 11, a first flow controller 12, a first three-way solenoid valve 13 and a first connecting pipe 15 connected in sequence;

[0063] a first water tank 14 in the middle portion communicating with the first three-way solenoid valve 13 , wherein the top portion of the first water tank 14 is in communication with the first connecting pipe 15 ;

[0064] The third manual pressure reducing valve 30, the fourth explosion-proof solenoid valve 31, the second flow controller 32, the second three-way solenoid valve 33 and the third connecting pipe 35 are connected in sequence;

[0065] a second water tank 34 in the middle portion communicating with the second three-way solenoid valve 33 , and a top portion of the second water tank 34 communicating with the third communicating pipe 35 ;

[0066] a second manual pressure-reducing valve 20 connected to the air inlet ends of the second explosion-proof solenoid valve 21 and the third explosion-proof solenoid valve 22; an air outlet end of the second explosion-proof solenoid valve 21 communicates with the connecting pipe between the first explosion-proof solenoid valve 11 and the first flow controller 12; and an air outlet end of the third explosion-proof solenoid valve 22 communicates with the connecting pipe between the fourth explosion-proof solenoid valve 31 and the second flow controller 32;

[0067] a DUT placement area 4 disposed at the outlet ends of the first communicating tube 15 and the third communicating tube 35;

[0068] The first exhaust pipe 5 and the second exhaust pipe 6 are arranged on one side of the DUT placement area 4; wherein,

[0069] A heating belt 7 is wound around the first water tank 14 , the first connecting pipe 15 , the second water tank 34 , the third connecting pipe 35 and the DUT placement area 4 .

[0070] The embodiments of the present application are further described in detail below with reference to the accompanying drawings.

[0071] First, see Figure 1 As shown, an embodiment of the present application provides a fuel cell air tightness testing device, the device comprising:

[0072] A first manual pressure reducing valve 10, a first explosion-proof solenoid valve 11, a first flow controller 12, a first three-way solenoid valve 13 and a first connecting pipe 15 connected in sequence;

[0073] a first water tank 14 in the middle portion communicating with the first three-way solenoid valve 13 , wherein the top portion of the first water tank 14 is in communication with the first connecting pipe 15 ;

[0074] The third manual pressure reducing valve 30, the fourth explosion-proof solenoid valve 31, the second flow controller 32, the second three-way solenoid valve 33 and the third connecting pipe 35 are connected in sequence;

[0075] a second water tank 34 in the middle portion communicating with the second three-way solenoid valve 33 , and a top portion of the second water tank 34 communicating with the third communicating pipe 35 ;

[0076] a second manual pressure-reducing valve 20 connected to the air inlet ends of the second explosion-proof solenoid valve 21 and the third explosion-proof solenoid valve 22; an air outlet end of the second explosion-proof solenoid valve 21 communicates with the connecting pipe between the first explosion-proof solenoid valve 11 and the first flow controller 12; and an air outlet end of the third explosion-proof solenoid valve 22 communicates with the connecting pipe between the fourth explosion-proof solenoid valve 31 and the second flow controller 32;

[0077] a DUT placement area 4 disposed at the outlet ends of the first communicating tube 15 and the third communicating tube 35;

[0078] The first exhaust pipe 5 and the second exhaust pipe 6 are arranged on one side of the DUT placement area 4; wherein,

[0079] A heating belt 7 is wound around the first water tank 14 , the first connecting pipe 15 , the second water tank 34 , the third connecting pipe 35 and the DUT placement area 4 .

[0080] The fuel cell air tightness testing device provided in the embodiment of the present application has a reasonable structure, is easy to use, and has accurate measurement results. It can accurately measure the leakage of a single fuel cell, has a wide range of applications, and effectively solves actual production problems.

[0081] Furthermore, the device also includes:

[0082] The controller 8 is respectively connected to the first explosion-proof solenoid valve 11, the first flow controller 12, the first three-way solenoid valve 13, the fourth explosion-proof solenoid valve 31, the second flow controller 32, the second three-way solenoid valve 33, the second explosion-proof solenoid valve 21, the third explosion-proof solenoid valve 22 and the heating belt 7 by signals.

[0083] Furthermore, the first water tank 14, the first connecting pipe 15, the second water tank 34 and the third connecting pipe 35 are all equipped with temperature sensors T;

[0084] The temperature sensor T is connected to the controller 8 for signal transmission.

[0085] Furthermore, the first connecting pipe 15 and the third connecting pipe 35 are both equipped with a pressure sensor P;

[0086] The pressure sensor P is connected to the controller 8 via a signal connection.

[0087] Furthermore, a temperature sensor 40 for a sample to be tested is disposed on the test piece placement area 4 .

[0088] Furthermore, a first exhaust valve 50 is provided at one end of the first exhaust pipe 5 close to the DUT placement area 4;

[0089] A second exhaust valve 60 is provided at one end of the second exhaust pipe 6 close to the DUT placement area 4 .

[0090] It should be noted that the first exhaust valve 50 and the second exhaust valve 60 may be manual ball valves.

[0091] Furthermore, the device further comprises:

[0092] A host computer 9 connected to the controller 8 by signals.

[0093] Based on the technical solution of the embodiment of this application, the specific situation is as follows:

[0094] As shown in the accompanying drawings Figure 1 As shown, it is a technical principle diagram of the fuel cell air tightness testing device;

[0095] The fuel cell air tightness testing device includes a host computer, a controller, explosion-proof solenoid valve I, explosion-proof solenoid valve II, explosion-proof solenoid valve III, explosion-proof solenoid valve IV, flow controller I, flow controller II, pressure sensor I, pressure sensor II, test sample, manual ball valve I, manual ball valve II, manual pressure reducing valve I, manual pressure reducing valve II, manual pressure reducing valve III, water tank I, water tank II, heating belt, temperature sensor, SV1, and SV2.

[0096] The device's operating strategy involves hydrogen, air, and nitrogen entering the test chamber through manual pressure-reducing valves I, II, and III, respectively. The manual pressure-reducing valves act as pressure regulators to control the maximum pressure at which gases enter the test chamber. After the manual pressure-reducing valves, they are connected to explosion-proof solenoid valves I, II, III, and IV, respectively. The host computer selects the gas type, and after the explosion-proof solenoid valves, they are connected to flow controllers. Signals from the host computer control the flow controllers, which then control the gas flow rate. A three-way solenoid valve is connected to the flow controllers, which control the flow direction, thereby selecting dry or wet gas. Gas enters the sample through a pressure sensor, which provides pressure feedback to the host computer. By closing the manual ball valve and, when the pressure reaches the desired level, closing the explosion-proof solenoid valves and stopping the gas supply, the tester waits 20 minutes and observes the pressure drop. If the pressure drop is ≤2 kPa, the test is deemed airtight. If the pressure drop is >2 kPa, the test is deemed airtight.

[0097] In summary, the fuel cell air tightness test device provided in the embodiments of this application is used to test the air tightness of membrane electrodes. It consists of a host computer, a manual pressure reducing valve, an explosion-proof solenoid valve, a controller, a pressure sensor, a three-way solenoid valve, a flow controller, a heating tape, a water tank, and a manual ball valve. By installing a manual ball valve at the hydrogen and air outlets of the test bench, the inlet and outlet form a closed loop, thereby solving the problem of air tightness testing of the membrane electrode.

[0098] At the same time, it has the following technical advantages:

[0099] Solve the problem of repeated disassembly and assembly of samples after pressure maintenance, simple operation, and improve test efficiency and safety;

[0100] Solved the problem of rapid reading of parameters and rapid analysis of air leakage;

[0101] The testing method based on this device can be applied to the air tightness testing fields of fuel cell stacks, short stacks, membrane electrodes, systems, etc. The testing method has clear ideas, many options, and strong feasibility.

[0102] The fuel cell air tightness test device can be used in the following ways:

[0103] The first way to use:

[0104] Suppose a sample needs to undergo an airtightness test with a battery temperature of 50°C, a humidity of 100%, and a gas flow rate of 200ml / min for hydrogen and 200ml / min for air. Based on the temperature and humidity conversion, the water tank temperature needs to be controlled at 50°C, the battery temperature at 50°C, and the intake pipe temperature at 50°C. The specific process is as follows:

[0105] In the first step, the host computer sets the set temperature of the pipeline heating belt and the battery heating belt and sends it to the controller, which controls the heating belt to heat to 50℃.

[0106] In the second step, hydrogen and air are reduced in pressure to 500kPa through manual pressure reducing valves I and III respectively and then enter explosion-proof solenoid valve I and explosion-proof solenoid valve IV.

[0107] The third step is to open the explosion-proof solenoid valves, allowing gas to flow to the flow controllers. The host computer sends flow controller I and II flow controller II flow signals, respectively, to the controllers, setting a flow rate of 200 ml / min. Flow controller I controls the hydrogen flow at 200 ml / min, while flow controller II controls the air flow at 200 ml / min.

[0108] In the fourth step, the host computer sends a moisture signal to the controller, and the controller controls SV1 and SV2 to enter the test sample through the humidification tank.

[0109] Step 5: Close the manual ball valve and observe the pressure values ​​fed back by Pressure Sensors I and II. When both reach 50 kPa, close the explosion-proof solenoid valve and cut off the air supply. Wait 20 minutes and observe the pressure drop. If the pressure drop is ≤ 2 kPa, the airtightness is considered acceptable. If the pressure drop is greater than 2 kPa, the airtightness is considered unacceptable.

[0110] The second way to use:

[0111] Assume that a sample needs to undergo a nitrogen air tightness test at room temperature with a dry gas flow rate of 500ml / min. The specific process is as follows:

[0112] In the first step, the nitrogen is reduced in pressure to 500kPa through the manual pressure reducing valve II and then enters the explosion-proof solenoid valve II and explosion-proof solenoid valve III.

[0113] In the second step, the host computer sends a signal to the controller, and the controller controls the opening of explosion-proof solenoid valve II and explosion-proof solenoid valve III, and the gas flows to flow controller I and flow controller II.

[0114] In the third step, the host computer sends a flow rate signal of 500ml / min to the controllers for flow controller I and 500ml / min respectively. Flow controller I controls the nitrogen flow rate at 500ml / min, and flow controller II controls the nitrogen flow rate at 500ml / min.

[0115] In the fourth step, the host computer sends a dry gas signal to the controller, and the controller controls SV1 and SV2 to enter the test sample through the straight pipe.

[0116] Step 5: Close the manual ball valve and observe the pressure values ​​fed back by Pressure Sensors I and II. When both reach 50 kPa, close the explosion-proof solenoid valve and cut off the air supply. Wait 20 minutes and observe the pressure drop. If the pressure drop is ≤ 2 kPa, the airtightness is considered acceptable. If the pressure drop is greater than 2 kPa, the airtightness is considered unacceptable.

[0117] The third way to use:

[0118] Assume that a sample requires switching to nitrogen for air tightness test after the endurance test. The specific operation process is as follows:

[0119] In the first step, after the endurance test is completed normally, the host computer controls to close the H2 explosion-proof solenoid valve I and the Air explosion-proof solenoid valve IV, and open the N2 explosion-proof solenoid valves II and III.

[0120] In the second step, nitrogen passes through the explosion-proof solenoid valve to flow controller I and flow controller II.

[0121] In the third step, the host computer sends a flow rate signal of 500ml / min to the controllers for flow controller I and 500ml / min respectively. Flow controller I controls the nitrogen flow rate at 500ml / min, and flow controller II controls the nitrogen flow rate at 500ml / min.

[0122] In the fourth step, the host computer sends a dry gas signal to the controller, and the controller controls SV1 and SV2 to enter the test sample through the straight pipe.

[0123] Step 5: Close the manual ball valve and observe the pressure values ​​fed back by Pressure Sensors I and II. When both reach 50 kPa, close the explosion-proof solenoid valve and cut off the air supply. Wait 20 minutes and observe the pressure drop. If the pressure drop is ≤ 2 kPa, the airtightness is considered acceptable. If the pressure drop is greater than 2 kPa, the airtightness is considered unacceptable.

[0124] In a second aspect, an embodiment of the present application provides a testing method for the fuel cell air tightness testing device mentioned in the first aspect, the testing method comprising the following steps:

[0125] A1. Obtain the test temperature, test humidity, hydrogen flow rate, and air flow rate of the sample to be tested;

[0126] A2. Place the sample to be tested in the test piece placement area 4, and connect the first connecting pipe 15, the third connecting pipe 35, the first exhaust pipe 5, and the second exhaust pipe 6 to the sample to be tested;

[0127] A3. Controlling the heating belt 7 to regulate the temperatures of the first water tank 14, the first connecting pipe 15, the second water tank 34, the third connecting pipe 35, and the DUT placement area 4 so that the water temperatures of the first water tank 14 and the second water tank 34, the internal temperatures of the first connecting pipe 15 and the third connecting pipe 35, and the external temperature of the DUT all match the test temperature.

[0128] A4. Dispatch hydrogen and air to the first explosion-proof solenoid valve 11 and the fourth explosion-proof solenoid valve 31 after the pressure is reduced to the first manual pressure reduction threshold through the first manual pressure reduction valve 10 and the third manual pressure reduction valve 30 respectively;

[0129] A5. Open the first explosion-proof solenoid valve 11 and the fourth explosion-proof solenoid valve 31 to allow hydrogen to enter the first flow controller 12 and air to enter the second flow controller 32, and configure corresponding flow control parameters for the first flow controller 12 and the second flow controller 32;

[0130] A6. In response to a preset moisture signal, the first three-way solenoid valve 13 and the second three-way solenoid valve 33 are controlled so that hydrogen enters the first water tank 14 and then enters the sample to be tested, and air enters the second water tank 34 and then enters the sample to be tested;

[0131] A7. Close the first exhaust pipe 5 and the second exhaust pipe 6. When the air pressure inside the first connecting pipe 15 and the third connecting pipe 35 reaches a preset first air pressure threshold, close the first explosion-proof solenoid valve 11 and the fourth explosion-proof solenoid valve 31.

[0132] A8. Within a preset first observation time, identify the air pressure drop values ​​of the first connecting tube 15 and the third connecting tube 35. If the air pressure drop values ​​are not greater than a preset first air pressure drop threshold, the air tightness of the sample to be tested is determined to be qualified; otherwise, the air tightness of the sample to be tested is determined to be unqualified.

[0133] The fuel cell air tightness testing method provided in the embodiment of the present application has a reasonable structure, is easy to use, and has accurate measurement results. It can accurately measure the leakage of a single fuel cell, has a wide range of applications, and effectively solves actual production problems.

[0134] Furthermore, the method further comprises the following steps:

[0135] Close the first explosion-proof solenoid valve 11 and the fourth explosion-proof solenoid valve 31, and open the second explosion-proof solenoid valve 21 and the third explosion-proof solenoid valve 22;

[0136] The nitrogen is dispatched to the first flow controller 12 and the second flow controller 32 through the second explosion-proof solenoid valve 21 and the third explosion-proof solenoid valve 22;

[0137] Configuring corresponding nitrogen flow control parameters to the first flow controller 12 and the second flow controller 32 respectively;

[0138] In response to a preset dry gas signal, the first three-way solenoid valve 13 and the second three-way solenoid valve 33 are controlled to allow nitrogen to enter the sample to be tested;

[0139] Close the first exhaust pipe 5 and the second exhaust pipe 6, and when the air pressure inside the first connecting pipe 15 and the third connecting pipe 35 reaches a preset first air pressure threshold, close the first explosion-proof solenoid valve 11 and the fourth explosion-proof solenoid valve 31;

[0140] Within a preset first observation time, the air pressure drop values ​​of the first connecting tube 15 and the third connecting tube 35 are identified. If the air pressure drop value is not greater than the preset first air pressure drop threshold, the air tightness of the sample to be tested is determined to be qualified; otherwise, the air tightness of the sample to be tested is determined to be unqualified.

[0141] In a third aspect, an embodiment of the present application provides a testing method for the fuel cell air tightness testing device mentioned in the first aspect, the testing method comprising the following steps:

[0142] B1. Place the sample to be tested in the test piece placement area 4, and connect the first connecting pipe 15, the third connecting pipe 35, the first exhaust pipe 5, and the second exhaust pipe 6 to the sample to be tested;

[0143] B2. The nitrogen is dispatched to enter the second explosion-proof solenoid valve 21 and the third explosion-proof solenoid valve 22 after being decompressed to the first manual decompression pressure threshold through the second manual decompression valve 20;

[0144] B3. Open the second explosion-proof solenoid valve 21 and the third explosion-proof solenoid valve 22 to allow nitrogen to flow to the first flow controller 12 and the second flow controller 32;

[0145] B4, configuring corresponding nitrogen flow control parameters to the first flow controller 12 and the second flow controller 32 respectively;

[0146] B5. In response to a preset dry gas signal, the first three-way solenoid valve 13 and the second three-way solenoid valve 33 are controlled to allow nitrogen to enter the sample to be tested;

[0147] B6. Close the first exhaust pipe 5 and the second exhaust pipe 6. When the air pressure inside the first connecting pipe 15 and the third connecting pipe 35 reaches a preset first air pressure threshold, close the first explosion-proof solenoid valve 11 and the fourth explosion-proof solenoid valve 31.

[0148] B7. Within a preset first observation time, identify the air pressure drop values ​​of the first connecting pipe 15 and the third connecting pipe 35. If the air pressure drop values ​​are not greater than a preset first air pressure drop threshold, the air tightness of the sample to be tested is determined to be qualified; otherwise, the air tightness of the sample to be tested is determined to be unqualified.

[0149] The fuel cell air tightness testing method provided in the embodiment of the present application has a reasonable structure, is easy to use, and has accurate measurement results. It can accurately measure the leakage of a single fuel cell, has a wide range of applications, and effectively solves actual production problems.

[0150] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0151] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0152] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A fuel cell air tightness testing device, characterized in that: The device comprises: A first manual pressure reducing valve (10), a first explosion-proof solenoid valve (11), a first flow controller (12), a first three-way solenoid valve (13), and a first connecting pipe (15) connected in sequence; a first water tank (14) whose middle portion is in communication with the first three-way solenoid valve (13), and whose top portion is in communication with the first connecting pipe (15); A third manual pressure reducing valve (30), a fourth explosion-proof solenoid valve (31), a second flow controller (32), a second three-way solenoid valve (33) and a third connecting pipe (35) connected in sequence; a second water tank (34) whose middle portion is in communication with the second three-way solenoid valve (33), and whose top portion is in communication with the third communicating pipe (35); a second manual pressure reducing valve (20) connected to the air inlet ends of the second explosion-proof solenoid valve (21) and the third explosion-proof solenoid valve (22); an air outlet end of the second explosion-proof solenoid valve (21) communicating with the connecting pipe between the first explosion-proof solenoid valve (11) and the first flow controller (12); and an air outlet end of the third explosion-proof solenoid valve (22) communicating with the connecting pipe between the fourth explosion-proof solenoid valve (31) and the second flow controller (32); a test piece placement area (4) disposed at the air outlet ends of the first communicating tube (15) and the third communicating tube (35); A first exhaust pipe (5) and a second exhaust pipe (6) are arranged on one side of the test piece placement area (4); wherein, A heating belt (7) is provided around the first water tank (14), the first connecting pipe (15), the second water tank (34), the third connecting pipe (35) and the test piece placement area (4).

2. The fuel cell air tightness testing device according to claim 1, wherein: The device further comprises: A controller (8), wherein the controller (8) is respectively connected to the first explosion-proof solenoid valve (11), the first flow controller (12), the first three-way solenoid valve (13), the fourth explosion-proof solenoid valve (31), the second flow controller (32), the second three-way solenoid valve (33), the second explosion-proof solenoid valve (21), the third explosion-proof solenoid valve (22) and the heating belt (7) by signals.

3. The fuel cell air tightness testing device according to claim 2, wherein: The first water tank (14), the first connecting pipe (15), the second water tank (34) and the third connecting pipe (35) are all equipped with temperature sensors (T); The temperature sensor (T) is signal-connected to the controller (8).

4. The fuel cell air tightness testing device according to claim 2, wherein: The first communicating pipe (15) and the third communicating pipe (35) are both provided with a pressure sensor (P); The pressure sensor (P) is signal-connected to the controller (8).

5. The fuel cell air tightness testing device according to claim 1, wherein: The test piece placement area (4) is provided with a test sample temperature sensor (40).

6. The fuel cell air tightness testing device according to claim 1, wherein: A first exhaust valve (50) is provided at one end of the first exhaust pipe (5) close to the test piece placement area (4); A second exhaust valve (60) is provided at one end of the second exhaust pipe (6) close to the test piece placement area (4).

7. The fuel cell air tightness testing device according to claim 2, wherein: The device further comprises: A host computer (9) is connected to the controller (8) via signals.

8. A fuel cell air tightness testing method based on the fuel cell air tightness testing device according to any one of claims 1 to 7, characterized in that: The test method comprises the following steps: Obtain the test temperature, test humidity, hydrogen flow rate and air flow rate of the sample to be tested; Placing the sample to be tested in the test piece placement area (4), and connecting the first connecting pipe (15), the third connecting pipe (35), the first exhaust pipe (5), and the second exhaust pipe (6) to the sample to be tested; The heating belt (7) is controlled to regulate the temperature of the first water tank (14), the first connecting pipe (15), the second water tank (34), the third connecting pipe (35) and the test piece placement area (4), so that the water temperature of the first water tank (14) and the second water tank (34), the internal temperature of the first connecting pipe (15) and the third connecting pipe (35), and the external temperature of the test sample all match the test temperature; The hydrogen and air are respectively decompressed through the first manual decompression valve (10) and the third manual decompression valve (30) to a first manual decompression pressure threshold and then enter the first explosion-proof solenoid valve (11) and the fourth explosion-proof solenoid valve (31); Opening the first explosion-proof solenoid valve (11) and the fourth explosion-proof solenoid valve (31) to allow hydrogen to enter the first flow controller (12) and air to enter the second flow controller (32), and configuring corresponding flow control parameters for the first flow controller (12) and the second flow controller (32); In response to a preset moisture signal, the first three-way solenoid valve (13) and the second three-way solenoid valve (33) are controlled so that hydrogen enters the first water tank (14) and then enters the sample to be tested, and air enters the second water tank (34) and then enters the sample to be tested; The first exhaust pipe (5) and the second exhaust pipe (6) are closed, and when the air pressure inside the first connecting pipe (15) and the third connecting pipe (35) reaches a preset first air pressure threshold, the first explosion-proof solenoid valve (11) and the fourth explosion-proof solenoid valve (31) are closed; Within a preset first observation time, the air pressure drop values ​​of the first connecting pipe (15) and the third connecting pipe (35) are identified. If the air pressure drop value is not greater than a preset first air pressure drop threshold value, it is determined that the air tightness of the sample to be tested is qualified; otherwise, it is determined that the air tightness of the sample to be tested is unqualified.

9. The fuel cell air tightness testing device testing method according to claim 8, characterized in that: The method further comprises the following steps: closing the first explosion-proof solenoid valve (11) and the fourth explosion-proof solenoid valve (31), and opening the second explosion-proof solenoid valve (21) and the third explosion-proof solenoid valve (22); Dispatching nitrogen gas to pass through the second explosion-proof solenoid valve (21) and the third explosion-proof solenoid valve (22) to the first flow controller (12) and the second flow controller (32); configuring corresponding nitrogen flow control parameters to the first flow controller (12) and the second flow controller (32); In response to a preset dry gas signal, the first three-way solenoid valve (13) and the second three-way solenoid valve (33) are controlled to allow nitrogen to enter the sample to be tested; The first exhaust pipe (5) and the second exhaust pipe (6) are closed, and when the air pressure inside the first connecting pipe (15) and the third connecting pipe (35) reaches a preset first air pressure threshold, the first explosion-proof solenoid valve (11) and the fourth explosion-proof solenoid valve (31) are closed; Within a preset first observation time, the air pressure drop values ​​of the first connecting pipe (15) and the third connecting pipe (35) are identified. If the air pressure drop value is not greater than a preset first air pressure drop threshold value, it is determined that the air tightness of the sample to be tested is qualified; otherwise, it is determined that the air tightness of the sample to be tested is unqualified.

10. A fuel cell air tightness testing method based on the fuel cell air tightness testing device according to any one of claims 1 to 7, characterized in that: The test method comprises the following steps: Placing the sample to be tested in the test piece placement area (4), and connecting the first connecting pipe (15), the third connecting pipe (35), the first exhaust pipe (5), and the second exhaust pipe (6) to the sample to be tested; The nitrogen is dispatched to enter the second explosion-proof solenoid valve (21) and the third explosion-proof solenoid valve (22) after being decompressed to a first manual decompression pressure threshold through the second manual decompression valve (20); Opening the second explosion-proof solenoid valve (21) and the third explosion-proof solenoid valve (22) to allow nitrogen to flow to the first flow controller (12) and the second flow controller (32); configuring corresponding nitrogen flow control parameters to the first flow controller (12) and the second flow controller (32); In response to a preset dry gas signal, the first three-way solenoid valve (13) and the second three-way solenoid valve (33) are controlled to allow nitrogen to enter the sample to be tested; The first exhaust pipe (5) and the second exhaust pipe (6) are closed, and when the air pressure inside the first connecting pipe (15) and the third connecting pipe (35) reaches a preset first air pressure threshold, the first explosion-proof solenoid valve (11) and the fourth explosion-proof solenoid valve (31) are closed; Within a preset first observation time, the air pressure drop values ​​of the first connecting pipe (15) and the third connecting pipe (35) are identified. If the air pressure drop value is not greater than a preset first air pressure drop threshold value, it is determined that the air tightness of the sample to be tested is qualified; otherwise, it is determined that the air tightness of the sample to be tested is unqualified.

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