A fuel cell detection device and method

Abstract

The application relates to a fuel cell detection device and method, which comprises a gas input module, an inlet gas selection module, a stack storage module and an outlet gas selection module connected in sequence; the gas input module comprises a gas storage tank, a humidification tank, an inlet flow control valve, an inlet gas flow meter, a second pressure sensor and an inlet gas control valve, the gas storage tank is connected with a dry gas control valve, and the humidification tank is connected with a humidification control valve; the inlet gas selection module comprises an inlet gas branch and a control valve arranged on the inlet gas branch; the outlet gas selection module comprises an outlet gas branch and a control valve arranged on the outlet gas branch; the stack storage module comprises a fuel cell stack and a thermostat, the fuel cell stack is arranged in the thermostat and connected with an internal resistance monitoring module; the outlet gas selection module further comprises an outlet flow control valve, an outlet gas flow meter, an outlet humidity control valve and a humidity sensor. Compared with the prior art, the detection mode is comprehensive, the air tightness determination method is various, the operation is convenient and fast, and the compatibility is strong.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and specifically to a fuel cell testing device and method. Background Technology

[0002] With the increasing demand for hydrogen fuel cells in the automotive industry, on-board fuel cell systems need to adapt to more complex operating environments. Good airtightness is one of the fundamental guarantees for the safe operation of fuel cells. In actual operating environments, fuel cells may start up after prolonged low-temperature storage in winter or after high-temperature storage in summer. Poor airtightness can cause a continuous decline in stack performance, affecting stack lifespan and even posing safety hazards in severe cases. Current technologies primarily test the airtightness of fuel cell stacks at room temperature, which does not represent the true airtightness of the stack under high or low temperature conditions. Therefore, it is essential to conduct airtightness testing in high and low temperature environments to confirm that there is no risk of external or internal leakage when the fuel cell operates at low or high temperatures. Furthermore, the internal humidity of the stack varies during high and low temperature storage, and the airtightness of the stack under different temperature and humidity conditions has not been practically verified. Therefore, it is necessary to develop a fuel cell temperature-controlled storage airtightness testing device and stack humidity control method to achieve airtightness testing of the stack under different humidity and temperature conditions.

[0003] Existing technologies can only perform fuel cell airtightness testing or purging at room temperature, but cannot control or detect the humidity within the fuel cell stack, nor can they perform airtightness testing at specific temperatures, i.e., they cannot perform airtightness testing on fuel cell stacks with different humidity levels under different temperature conditions. Because the operating environment temperature of fuel cell stacks varies greatly, the humidity state inside the working stack differs from that in the non-working state; therefore, airtightness testing at room temperature cannot reflect the actual airtightness of the fuel cell during operation. Summary of the Invention

[0004] The purpose of this invention is to provide a fuel cell testing device and method to achieve fuel cell stack humidity control, storage temperature control, and airtightness testing under fixed temperature and fixed internal humidity conditions.

[0005] The objective of this invention can be achieved through the following technical solution: a fuel cell testing device, characterized in that it comprises a gas input module, an inlet gas selection module, a stack storage module, and an outlet gas selection module connected in sequence;

[0006] The gas input module includes a gas storage tank, a humidifier tank, an inlet flow control valve, an inlet gas flow meter, a second pressure sensor, and an intake control valve. The gas storage tank is connected to a dry gas control valve, and the humidifier tank is connected to a humidifier control valve. The inlet flow control valve and the inlet gas flow meter are set on one branch, and the second pressure sensor and the intake control valve are set on another branch.

[0007] The intake selection module includes an intake branch and a control valve installed on the intake branch; the exhaust selection module includes an exhaust branch and a control valve installed on the exhaust branch.

[0008] The fuel cell stack storage module includes a fuel cell stack and a constant temperature chamber. The fuel cell stack is placed inside the constant temperature chamber and connected to an internal resistance monitoring module.

[0009] The outlet gas selection module also includes an outlet flow control valve, an outlet gas flow meter, an outlet humidity control valve, and a humidity sensor. The outlet flow control valve and the outlet gas flow meter are installed on one branch, and the outlet humidity control valve and the humidity sensor are installed on another branch.

[0010] Preferably, the gas input module further includes a first intake pressure reducing valve and a second intake pressure reducing valve, wherein the first intake pressure reducing valve is located at the outlet of the gas storage tank and the second intake pressure reducing valve is located at the inlet side of the second pressure sensor.

[0011] More preferably, a first pressure sensor is provided on the outlet side of the first intake pressure reducing valve.

[0012] Preferably, the humidifier tank and humidifier control valve are located on a branch line in parallel with the dry gas control valve. The branch line containing the humidifier tank and humidifier control valve and the branch line containing the dry gas control valve are connected to the main pipeline. The two branches containing the inlet flow control valve and the inlet gas flow meter, and the second pressure sensor and the inlet control valve are also connected to the main pipeline. The outlet of the main pipeline is connected to the inlet selection module.

[0013] Preferably, the air intake selection module includes three air intake branches and control valves installed on each branch. The three air intake branches are respectively connected to the air cavity inlet, water cavity inlet and hydrogen cavity inlet of the fuel cell stack. An air inlet control valve, a water inlet control valve and a hydrogen inlet control valve are respectively installed on the three air intake branches.

[0014] Preferably, the gas outlet selection module includes three gas outlet branches and control valves installed on each branch. One end of each of the three gas outlet branches is connected to the cavity outlet, water cavity outlet, and hydrogen cavity outlet of the fuel cell stack, respectively. An air outlet control valve, a water outlet control valve, and a hydrogen outlet control valve are respectively installed on each of the three gas outlet branches. The other end of the three gas outlet branches converges to one end of the main pipeline. The other end of the main pipeline is connected to two gas outlet branches. One gas outlet branch is connected to an outlet flow control valve and an outlet gas flow meter, and the other gas outlet branch is connected to an outlet humidity control valve and a humidity sensor.

[0015] Preferably, the internal resistance monitoring module includes an internal resistance meter, a positive electrode test line, and a negative electrode test line. The internal resistance meter is placed outside the constant temperature chamber, and the positive electrode test line and the negative electrode test line are connected to the positive and negative electrodes of the fuel cell stack respectively through the test holes of the constant temperature chamber.

[0016] Preferably, the gas input module is connected to a pressure relief module, which includes a pressure relief branch and a pressure relief control valve installed on the pressure relief branch, and the pressure relief branch is connected to a gas storage tank.

[0017] A fuel cell testing method, using the above-mentioned apparatus, includes the following steps:

[0018] S1: Place the fuel cell stack in a constant temperature chamber, set the storage temperature and storage time, and perform an airtightness test after the conditions are met.

[0019] S2: Open the control valve on the inlet branch corresponding to the fuel cell stack chamber to be tested, close the control valve on the outlet branch, and close the control valve on the inlet branch after the inlet pressure stabilizes. Determine whether the chamber airtightness is qualified by recording the pressure change over a fixed period of time. Alternatively, close the control valve on the inlet branch after the inlet pressure stabilizes, open the inlet flow control valve, and determine the amount of gas leakage in the chamber by recording the reading of the inlet gas flow meter after it stabilizes.

[0020] Furthermore, when humidification of the fuel cell stack is required, the dry gas control valve is closed, the humidification control valve is opened, the control valves on the corresponding inlet and outlet branches of the chamber to be humidified are opened, the outlet flow control valve is closed, the outlet humidity control valve is opened, the temperature of the constant temperature chamber is controlled, and the water temperature in the humidification tank is controlled to regulate the gas humidity. The humidity inside the fuel cell stack is monitored by a humidity sensor, and the internal resistance is monitored by an internal resistance meter. Once the set humidity is reached, the gas supply is stopped, and all control valves are closed.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. This invention enables the detection of airtightness during temperature-controlled storage;

[0023] 2. This invention can perform single-chamber, dual-chamber, and triple-chamber airtightness testing, as well as dual-chamber leakage detection;

[0024] 3. This invention can purge or humidify the fuel cell stack to control the internal humidity of the fuel cell stack;

[0025] 4. This invention can detect the internal resistance of the fuel cell stack in real time, and indirectly determine the humidity status of the internal membrane of the fuel cell stack;

[0026] 5. This invention provides a device and method for airtightness testing and humidity control during the temperature-controlled storage process of fuel cells, which can realize humidity control of fuel cell stacks, storage temperature control, and airtightness testing under fixed temperature and fixed internal humidity conditions of the fuel cell stack.

[0027] 6. This invention can adjust the water content inside the fuel cell stack, and can perform temperature-controlled storage verification after purging or humidifying the fuel cell stack. It can simulate the temperature and humidity conditions of the fuel cell stack in actual vehicle operation to detect air tightness. The test results are more practical than those of room temperature air tightness tests.

[0028] 7. This invention can perform single-cavity, dual-cavity, and triple-cavity airtightness testing, and can select pressure holding test or leakage detection. It can perform hydrogen cavity-to-empty cavity leakage, hydrogen cavity-to-water cavity leakage, and empty cavity-to-water cavity leakage tests. It has an automatic pressure relief function, can store the fuel cell stack under test at high and low temperatures, can humidify or purge the fuel cell stack under test at specific temperatures, and can perform airtightness testing of fuel cell stacks under different temperature and humidity conditions. It has the characteristics of comprehensive testing methods, diverse airtightness determination methods, convenient and fast operation, and strong compatibility. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the detection device of the present invention;

[0030] In the diagram: 100-Gas input module, 200-Inlet gas selection module, 300-Electric stack storage module, 400-Outlet gas selection module, 500-Internal resistance monitoring module, 600-Pressure relief module, 1-Gas storage tank, 2-First inlet pressure reducing valve, 3-First pressure sensor, 4-Humidification control valve, 5-Humidification tank, 6-Dry gas control valve, 7-Second inlet pressure reducing valve, 8-Second pressure sensor, 9-Inlet control valve, 10-Inlet flow control valve, 11-Inlet gas flow rate 12-Air inlet control valve, 13-Water inlet control valve, 14-Hydrogen inlet control valve, 15-Fuel cell stack, 16-Constant temperature chamber, 17-Air outlet control valve, 18-Water outlet control valve, 19-Hydrogen outlet control valve; 20-Outlet flow control valve, 21-Outlet gas flow meter, 22-Outlet humidity control valve, 23-Humidity sensor, 24-Internal resistance meter, 25-Pressure relief control valve, 26-Positive electrode test line, 27-Negative electrode test line. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0032] Example 1

[0033] A device and method for testing the airtightness and humidity control during the temperature-controlled storage process of a fuel cell, comprising: a gas input module 100, an inlet gas selection module 200, a fuel cell stack storage module 300, an outlet gas selection module 400, an internal resistance monitoring module 500, and a pressure relief module 600.

[0034] The gas input module 100 includes a gas storage tank 1, a humidification tank 5, a pressure reducing valve, a pressure sensor, a control valve, and a flow meter. Opening the dry gas control valve 6 connected to the gas storage tank 1 and closing the humidification control valve 4 connected to the humidification tank 5 allows for the selection of dry gas to enter. Closing the dry gas control valve 6 and opening the humidification control valve 4 allows for the switching to wet gas to enter. Adjusting the pressure reducing valve in conjunction with the pressure sensor can control the intake pressure. Opening the intake control valve 9 connected to the second pressure sensor 8 allows gas to enter the intake selection module 200. Closing the intake control valve 9 and opening the inlet flow control valve 10 allows leaked gas to flow through the inlet gas flow meter 11 to confirm the amount of gas leaking from the fuel cell stack.

[0035] The intake selection module 200 includes three intake branches and control valves, which are respectively connected to the air cavity inlet, water cavity inlet and hydrogen cavity inlet of the fuel cell stack 15. The three intake branches are respectively equipped with an air inlet control valve 12, a water inlet control valve 13 and a hydrogen inlet control valve 14. Adjusting the opening and closing of the control valves can control the flow of gas into the corresponding pipeline.

[0036] The fuel cell stack storage module 300 includes a fuel cell stack under test 15 and a constant temperature chamber 16. The fuel cell stack under test is placed in the constant temperature chamber 16. The temperature of the constant temperature chamber 16 can be adjusted to achieve a high and low temperature storage environment. There is a test hole on one side of the constant temperature chamber 16, which can be used to connect pipelines and lines into the constant temperature chamber 16.

[0037] The gas outlet selection module 400 includes three gas outlet branches, control valves, gas flow meters, and humidity sensors. One end of each of the three gas outlet branches is connected to the cavity outlet, water cavity outlet, and hydrogen cavity outlet of the fuel cell stack 15, respectively. Each of the three gas outlet branches is equipped with an air outlet control valve 17, a water outlet control valve 18, and a hydrogen outlet control valve 19, which can control the gas flow out of the corresponding pipeline. The other end of the three gas outlet branches is connected to one end of the main pipeline. The other end of the main pipeline is connected to two gas outlet branches. One gas outlet branch is connected to an outlet flow control valve 20 and an outlet gas flow meter 21, and the other gas outlet branch is connected to an outlet humidity control valve 22 and a humidity sensor 23.

[0038] The internal resistance monitoring module 500 includes an internal resistance meter 24 and test leads. The internal resistance meter 24 is placed outside the constant temperature chamber 16, and the test leads are connected to the positive and negative electrodes of the internal fuel cell stack through the test holes of the constant temperature chamber to monitor the real-time internal resistance of the stack.

[0039] The pressure relief module 600 includes a pressure relief branch and a pressure relief control valve 25. The pressure relief branch is connected to the gas storage tank 1. When the pipeline pressure is too high, the pressure relief control valve 25 is opened to relieve the pressure so that the pipeline reaches the set pressure.

[0040] When it is necessary to test the air tightness of the fuel cell stack 15 at a specific temperature, the stack is stored in a constant temperature chamber 16, the storage temperature and storage time are set, and after the conditions are met, the air inlet and outlet pipes are connected through the test hole of the constant temperature chamber to perform the air tightness test.

[0041] When it is necessary to perform a single-chamber airtightness test on the fuel cell stack 15, open the corresponding single-chamber inlet control valve (air inlet control valve 12, water inlet control valve 13, or hydrogen inlet control valve 14), close the corresponding single-chamber outlet control valve (air outlet control valve 17, water outlet control valve 18, or hydrogen outlet control valve 19), and close the inlet control valve after the inlet pressure stabilizes. Determine whether the single-chamber airtightness is qualified by recording the pressure change over a fixed period of time, or close the inlet control valve and open the inlet flow control valve 10 after the inlet pressure stabilizes, and determine the single-chamber gas leakage by recording the reading of the inlet gas flow meter 11 after stabilization.

[0042] When it is necessary to perform dual-chamber or triple-chamber air tightness testing on fuel cell stacks, open the corresponding intake control valve for the dual-chamber or triple-chamber stack and close the corresponding exhaust control valve for the dual-chamber or triple-chamber stack. The testing operation method is the same as that for single-chamber air tightness testing.

[0043] When it is necessary to perform dual-chamber leakage detection on fuel cell stack 15, including hydrogen chamber leakage, hydrogen chamber leakage, water chamber leakage, and air chamber leakage, open the corresponding inlet control valve of one chamber and close the corresponding outlet control valve, open the corresponding outlet control valve of the other chamber and close the corresponding inlet control valve, open the outlet flow control valve 20, and use the outlet gas flow meter 21 to record the gas flow after stabilization to determine the amount of dual-chamber leakage.

[0044] When the fuel cell stack 15 needs to be humidified in a single or dual chamber, the dry gas control valve 6 is closed, the humidification control valve 4 is opened, the inlet and outlet control valves of the branch to be humidified are opened, the outlet flow control valve 20 is closed, the outlet humidity control valve 22 is opened, the temperature of the constant temperature chamber 16 is controlled, and the water temperature in the humidification tank 5 is controlled to adjust the gas humidity. The humidity inside the stack is monitored by the outlet humidity sensor 23, and the internal resistance is monitored by the internal resistance meter 24. After the set humidity is reached, the gas supply is stopped and all control valves are closed.

[0045] When the fuel cell stack 15 needs to be purged in a single chamber, dual chamber, or triple chamber, the humidification control valve 4 is closed, the dry gas control valve 6 is opened, the inlet and outlet control valves of the branch to be purged are opened, the outlet flow control valve 20 is closed, the outlet humidity control valve 22 is opened, the temperature of the constant temperature chamber 16 is controlled, the purging status inside the stack is monitored by the outlet humidity sensor 23, and the internal resistance is monitored by the internal resistance meter 24. After the set humidity is reached, the gas supply is stopped and all control valves are closed.

[0046] Example 2

[0047] The working mode of three-chamber airtightness testing at a specific temperature, and the specific steps are as follows:

[0048] Step 1: According to Figure 1 The structural diagram shows the test platform being built. The initial state is that all valves are closed. The fuel cell stack 15 is placed in the constant temperature chamber 16, and the temperature of the constant temperature chamber 16 is set to a fixed temperature T. The stack core temperature is stored for a specified time until it reaches the set temperature T1.

[0049] Step 2: Open the first intake pressure reducing valve 2 and the dry gas control valve 6, adjust the second intake pressure reducing valve 7 so that the second pressure sensor 8 displays a fixed pressure value P1, open the air inlet control valve 12, the water inlet control valve 13, and the hydrogen inlet control valve 14, and slowly open the intake control valve 9 so that the gas can reach the three chambers through the three branches until the value of the second pressure sensor 8 stabilizes at the fixed pressure value P1;

[0050] Step 3: Pressure holding test. Close the main control valve 6 and maintain it for a fixed time t. Record the value P2 of the second pressure sensor 8. Compare the pressure drop from P1 to P2 with the pressure drop of less than ΔP for a fixed time t1 required for airtightness to determine whether the airtightness is qualified.

[0051] Step 4: Leakage detection. Close the inlet control valve 9, open the inlet flow control valve 10, record the flow rate value after the inlet gas flow meter 11 reading stabilizes or record the flow rate value after a fixed time t2, and compare it with the leakage qualification index to determine whether the airtightness is qualified.

[0052] For the airtightness test methods in steps 1, 2, 3 and steps 1, 2, 4, only one method can be selected to determine the airtightness. For single-chamber and double-chamber airtightness tests, refer to the above steps.

[0053] Example 3

[0054] The specific steps for detecting hydrogen cavity leakage at a specific temperature are as follows:

[0055] Step 1: According to Figure 1The structural diagram shows the test platform being built. The initial state is that all valves are closed. The fuel cell 15 is placed in the constant temperature chamber 16, and the temperature of the constant temperature chamber 16 is set to a fixed temperature T. The core temperature is stored for a specified time until it reaches the set temperature T2.

[0056] Step 2: Open the first intake pressure reducing valve 2 and the dry gas control valve 6, adjust the second intake pressure reducing valve 7 so that the second pressure sensor 8 displays a fixed pressure value P3, open the hydrogen inlet control valve 14 and the intake control valve 9, and wait for the second pressure sensor 8 to stabilize at the fixed pressure value P3.

[0057] Step 3: Leakage detection. Open the air outlet control valve 17 and the outlet flow control valve 20. Record the flow rate value after the outlet gas flow meter 21 reading stabilizes or record the flow rate value after a fixed time t3. Compare the flow rate value with the leakage qualification index to determine whether the air tightness is qualified.

[0058] For the steps of detecting leakage in the hydrogen cavity / water cavity and the hollow cavity / water cavity, refer to steps 1, 2, and 3: ventilate the detection cavity and collect the corresponding leakage amount.

[0059] Example 4

[0060] The specific steps for the hydrogen cavity humidification working mode at a specific temperature are as follows:

[0061] Step 1: According to Figure 1 The structural diagram shows the test platform being built. The initial state is that all valves are closed. The fuel cell stack 15 is placed in the constant temperature chamber 16, and the temperature of the constant temperature chamber 16 is set to a fixed temperature T. The stack core temperature is stored for a specified time until it reaches the set temperature T3.

[0062] Step 2: Open the first intake pressure reducing valve 2 and the humidification control valve 4, adjust the second intake pressure reducing valve 7 so that the second pressure sensor 8 displays a fixed pressure value P4, open the air inlet control valve 12, the hydrogen inlet control valve 14 and the intake control valve 9, and open the air outlet control valve 17 and the hydrogen outlet control valve 19.

[0063] Step 3: Open the outlet humidity control valve 22 and record whether the humidity sensor 23 reading has reached a stable value;

[0064] Step 4: Turn on the internal resistance meter 24 and record the reading of the internal resistance meter 24. When the internal resistance value reaches the preset value, close the humidification control valve 4 and the first air intake pressure reducing valve 2, and open the pressure relief control valve 25 and the dry air control valve 6 to exhaust the gas.

[0065] Example 5

[0066] The specific steps for the water chamber purging operation mode at a specific temperature are as follows:

[0067] Step 1: According to Figure 1The structural diagram shows the test platform being built. The initial state is that all valves are closed. The fuel cell stack 15 is placed in the constant temperature chamber 16, and the temperature of the constant temperature chamber 16 is set to a fixed temperature T. The stack core temperature is stored for a specified time until it reaches the set temperature T4.

[0068] Step 2: Open the first intake pressure reducing valve 2 and the dry air control valve 6, adjust the second intake pressure reducing valve 7 so that the second pressure sensor 8 displays a fixed pressure value P5, and open the intake control valve 9, the water inlet control valve 13, and the water outlet control valve 18.

[0069] Step 3: Open the outlet humidity control valve 22, record the humidity sensor 23 reading until the reading is less than the specified humidity, close the first intake pressure reducing valve 2, open the pressure relief control valve 25, and exhaust the air.

[0070] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A fuel cell testing device, characterized in that, It includes a gas input module (100), an inlet gas selection module (200), an electric stack storage module (300), and an outlet gas selection module (400) connected in sequence. The gas input module (100) includes a gas storage tank (1), a humidifier tank (5), an inlet flow control valve (10), an inlet gas flow meter (11), a second pressure sensor (8), and an inlet control valve (9). The gas storage tank (1) is connected to a dry gas control valve (6), and the humidifier tank (5) is connected to a humidifier control valve (4). The inlet flow control valve (10) and the inlet gas flow meter (11) are located on one branch, and the second pressure sensor (8) and the inlet control valve (9) are located on another branch. The intake selection module (200) includes an intake branch and a control valve disposed on the intake branch, and the exhaust selection module (400) includes an exhaust branch and a control valve disposed on the exhaust branch. The fuel cell stack storage module (300) includes a fuel cell stack (15) and a constant temperature chamber (16). The fuel cell stack (15) is placed inside the constant temperature chamber (16) and connected to an internal resistance monitoring module (500). The outlet gas selection module (400) further includes an outlet flow control valve (20), an outlet gas flow meter (21), an outlet humidity control valve (22), and a humidity sensor (23). The outlet flow control valve (20) and the outlet gas flow meter (21) are located on one branch, and the outlet humidity control valve (22) and the humidity sensor (23) are located on another branch. The humidifier (5) and humidifier control valve (4) are set on a branch line in parallel with the dry gas control valve (6). The branch line where the humidifier (5) and humidifier control valve (4) are located and the branch line where the dry gas control valve (6) is located are connected to the main pipeline. The two branches where the inlet flow control valve (10) and inlet gas flow meter (11) and the second pressure sensor (8) and inlet control valve (9) are located are also connected to the main pipeline. The outlet of the main pipeline is connected to the inlet selection module (200). The internal resistance monitoring module (500) includes an internal resistance meter (24), a positive electrode test line (26), and a negative electrode test line (27). The internal resistance meter (24) is placed outside the constant temperature chamber (16). The positive electrode test line (26) and the negative electrode test line (27) are connected to the positive and negative electrodes of the fuel cell stack (15) through the test holes of the constant temperature chamber, respectively. Includes the following steps: S1: Place the fuel cell stack (15) in a constant temperature chamber (16), set the storage temperature and storage time, and perform an airtightness test after the conditions are met; S2: Open the control valve on the inlet branch corresponding to the fuel cell stack (15) chamber to be tested, close the control valve on the outlet branch, and close the control valve on the inlet branch after the inlet pressure stabilizes. Determine whether the chamber air tightness is qualified by recording the pressure change within a fixed time period, or close the control valve on the inlet branch after the inlet pressure stabilizes, open the inlet flow control valve (10), and determine the chamber gas leakage by recording the reading of the inlet gas flow meter (11) after stabilization. When the fuel cell stack (15) needs to be humidified, close the dry gas control valve (6), open the humidification control valve (4), open the control valves on the corresponding air inlet and outlet branches of the chamber to be humidified, close the outlet flow control valve (20), open the outlet humidity control valve (22), control the temperature of the constant temperature chamber (16), control the water temperature in the humidification tank (5) to adjust the gas humidity, monitor the humidity inside the fuel cell stack (15) through the humidity sensor (23), monitor the internal resistance with the internal resistance meter (24), stop the air supply after the set humidity is reached, and close all control valves.

2. The fuel cell testing device according to claim 1, characterized in that, The gas input module (100) further includes a first intake pressure reducing valve (2) and a second intake pressure reducing valve (7). The first intake pressure reducing valve (2) is located at the outlet of the gas storage tank (1), and the second intake pressure reducing valve (7) is located at the inlet side of the second pressure sensor (8).

3. The fuel cell testing device according to claim 2, characterized in that, The first intake pressure reducing valve (2) is equipped with a first pressure sensor (3) on the outlet side.

4. The fuel cell testing device according to claim 1, characterized in that, The intake selection module (200) includes three intake branches and control valves installed on each branch. The three intake branches are respectively connected to the air cavity inlet, water cavity inlet and hydrogen cavity inlet of the fuel cell stack (15). An air inlet control valve (12), a water inlet control valve (13) and a hydrogen inlet control valve (14) are respectively installed on the three intake branches.

5. The fuel cell testing device according to claim 1, characterized in that, The gas outlet selection module (400) includes three gas outlet branches and control valves installed on each branch. One end of each of the three gas outlet branches is connected to the cavity outlet, water cavity outlet and hydrogen cavity outlet of the fuel cell stack (15). An air outlet control valve (17), a water outlet control valve (18) and a hydrogen outlet control valve (19) are respectively installed on each of the three gas outlet branches. The other end of the three gas outlet branches is connected to one end of the main pipeline. The other end of the main pipeline is connected to two gas outlet branches. One gas outlet branch is connected to an outlet flow control valve (20) and an outlet gas flow meter (21). The other gas outlet branch is connected to an outlet humidity control valve (22) and a humidity sensor (23).

6. The fuel cell testing device according to claim 1, characterized in that, The gas input module (100) is connected to a pressure relief module (600), which includes a pressure relief branch and a pressure relief control valve (25) installed on the pressure relief branch. The pressure relief branch is connected to a gas storage tank (1).

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