A method and apparatus for detecting fuel cell leaks

Abstract

This invention relates to the field of fuel cell testing technology, specifically to a fuel cell leak detection method and apparatus. The apparatus acquires actual operating parameters of the fuel cell and stores threshold values ​​for each parameter. These actual operating parameters include the pressure drop at the inlet and outlet of the hydrogen path, the pressure drop at the inlet and outlet of the air path, the inlet and outlet temperatures of the fuel cell, the fuel cell impedance value, the coolant pump speed, the water pump outlet pressure change value, and the fuel cell voltage change rate over a predetermined period. The fuel cell impedance value includes both high-frequency and low-frequency impedance values. Based on these actual operating parameters and their corresponding threshold values, the apparatus determines whether a leak has occurred between the gas path and the coolant path.

Description

Technical Field

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

[0002] A fuel cell is a device that converts chemical energy into electrical energy through the reaction of hydrogen and air. It consists of three circuits: a hydrogen circuit, an air circuit, and a coolant circuit. The hydrogen and air circuits provide the gases required for the reaction, while the coolant circuit provides the coolant needed to dissipate heat during the reaction.

[0003] If leakage occurs between the hydrogen, air, and coolant paths, it can have several negative consequences. First, coolant can enter the hydrogen or air path and coat the active sites of the membrane electrode assembly (MEA), reducing performance and shortening the fuel cell's lifespan. Second, gas from the hydrogen or air path can enter the coolant path, causing uneven temperature distribution in the stack, creating localized hot spots, further impacting fuel cell lifespan, and in severe cases, leading to fuel cell ablation and compromising the safety of the fuel cell system. Therefore, effectively monitoring leaks in the gas and coolant paths during fuel cell system operation is crucial.

[0004] Current technologies only monitor leaks from the coolant to the gas path or from the hydrogen path to the coolant path, failing to monitor bidirectional leaks in both the coolant and gas paths. If mutual leaks between the gas and coolant paths fail to be detected in time during fuel cell operation, it will affect the battery's efficiency and lifespan, and in severe cases, cause safety issues. Therefore, a detection method and device are needed to achieve real-time monitoring and detection of mutual leaks between the gas and coolant paths during fuel cell operation. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a detection method and device to detect whether there is mutual leakage between the gas path and the coolant path.

[0006] To address the shortcomings of existing technologies, the technical solution adopted by this invention is: a fuel cell leakage detection method, which acquires the actual operating parameters of the fuel cell and sets thresholds for each parameter. The actual operating parameters include the inlet and outlet pressure drop of the hydrogen path, the inlet and outlet pressure drop of the air path, the inlet and outlet temperatures of the fuel cell, the fuel cell impedance value, the coolant pump speed, the water pump outlet pressure change value, and the fuel cell voltage change rate within a predetermined time period. The fuel cell impedance value includes high-frequency impedance and low-frequency impedance values. The thresholds corresponding to the actual operating parameters include the hydrogen path inlet and outlet pressure drop threshold, the air path inlet and outlet pressure drop threshold, the coolant path inlet and outlet temperature threshold, the fuel cell impedance threshold, the coolant pump speed threshold, the coolant pump outlet pressure change threshold, and the voltage change rate threshold. The fuel cell impedance threshold includes high-frequency impedance and low-frequency impedance thresholds. Whether a leak occurs between the gas path and the coolant path is determined based on the actual operating parameters and their corresponding thresholds.

[0007] Preferably, the determination of whether gas is leaking into the coolant circuit is based on the coolant pump speed, coolant pump outlet pressure change, and coolant circuit inlet and outlet temperatures and temperature difference within a predetermined time period. The thresholds involved in the determination process include: coolant pump speed threshold, coolant pump outlet pressure change threshold, and coolant circuit inlet and outlet temperature threshold.

[0008] Preferably, the specific process for determining whether gas is leaking into the coolant circuit is as follows:

[0009] S1: Obtain the actual operating parameters and corresponding thresholds during operation. The actual operating parameters include the fuel cell coolant pump speed, coolant pump outlet pressure change, and coolant circuit inlet and outlet temperatures and temperature difference. The thresholds include coolant pump speed threshold, coolant pump outlet pressure change threshold, and coolant circuit inlet and outlet temperature threshold.

[0010] S2: If the change in coolant pump outlet pressure within a predetermined time period exceeds the coolant pump outlet pressure change threshold, proceed to S3.

[0011] S3: Determine if the outlet temperature of the fuel cell has increased to the outlet temperature threshold; otherwise, proceed to S7; otherwise, proceed to S4.

[0012] S4: Determine if the coolant pump speed has decreased to the coolant pump speed threshold; if not, proceed to S7; if yes, proceed to S5.

[0013] S5: Adjust the coolant pump speed and adjust the inlet and outlet temperatures to the normal range within the set temperature difference;

[0014] S6: Determine if the coolant pump speed is higher than the coolant pump speed threshold; if not, proceed to S7; if yes, proceed to S8.

[0015] S7: Investigate the cause of the abnormality; terminate the operation;

[0016] S8: If a gas leak is detected into the coolant circuit, the operation will be terminated.

[0017] Preferably, whether the coolant leaks into the gas path is determined based on the voltage change rate, the pressure drop at the inlet and outlet of the hydrogen path, the pressure drop at the inlet and outlet of the air path, the fuel cell impedance value, and the corresponding thresholds within a predetermined time period. The thresholds involved in whether the coolant leaks into the gas path include the voltage change rate threshold, the pressure drop threshold at the inlet and outlet of the hydrogen path, the pressure drop threshold at the inlet and outlet of the air path, and the fuel cell impedance threshold.

[0018] Preferably, the specific process for determining whether coolant leaks into the air passage is as follows:

[0019] S1: Obtain actual operating parameters and thresholds during operation: voltage change rate, hydrogen inlet and outlet pressure drop, air inlet and outlet pressure drop, and fuel cell impedance value within a predetermined time period; the thresholds involved include voltage change rate threshold, hydrogen inlet and outlet pressure drop threshold, air inlet and outlet pressure drop threshold, and fuel cell impedance threshold (including high-frequency impedance threshold and low-frequency impedance threshold).

[0020] S2: If the voltage change rate is greater than the voltage change rate threshold within a predetermined time period, proceed to S3;

[0021] S3: Determine if the operating conditions deviate from the set value: If the operating conditions deviate from the set value, the operating conditions are corrected. If the voltage change rate changes within its threshold after the operating conditions are corrected, the operation continues; if the operating conditions do not deviate from the set value, proceed to S4.

[0022] S4: Determine whether the pressure drop at the gas inlet and outlet is greater than its corresponding threshold, and whether the high-frequency and low-frequency impedances are greater than the fuel cell impedance threshold.

[0023] S5: Determine whether the increase in pressure drop at the inlet and outlet of the hydrogen path exceeds the pressure drop threshold at the inlet and outlet of the hydrogen path, and whether both high-frequency and low-frequency impedances increase, and whether the increase in high-frequency impedance exceeds the impedance threshold of the fuel cell; if the pressure drop at the inlet and outlet of the hydrogen path increases and exceeds the pressure drop threshold at the inlet and outlet of the hydrogen path, and both high-frequency and low-frequency impedances increase, and the increase in high-frequency impedance exceeds the impedance threshold of the fuel cell, then it is determined that there is a leak from the coolant path to the hydrogen path; otherwise, proceed to S5.

[0024] S6: If the pressure drop at the inlet and outlet of the air path increases and exceeds the pressure drop threshold at the inlet and outlet of the air path, both the high-frequency and low-frequency impedances increase, and the low-frequency impedance increases beyond the threshold, then it is determined that the coolant path is leaking into the hydrogen path.

[0025] S7: After investigating the cause of the abnormality, such as a leak in the coolant circuit into the hydrogen circuit or a leak in the coolant circuit into the air circuit, terminate the operation.

[0026] A fuel cell leak detection device includes a control module connected to a storage module, a transmission module, an input module, an output module, and a controlled system. The device acquires actual operating parameters and stores the set thresholds for each parameter.

[0027] The beneficial effects of the present invention are as follows: The method of the present invention determines whether leakage occurs between the gas path and the coolant path by setting thresholds for each parameter according to the actual operating parameters of the fuel cell obtained by the detection device. This solves the problem of how to effectively monitor whether leakage occurs in the gas path and coolant path during the operation of the fuel cell system. It not only monitors the problem of leakage from the coolant path to the gas path, but also monitors whether gas leaks into the coolant path; thus ensuring the operational safety and efficiency of the fuel cell.

[0028] 1. Two-way leak detection: Through a step-by-step logic judgment mechanism, it can identify both gas leaks into the coolant path (such as hydrogen or air leaks into the coolant system) and coolant leaks into the gas path (such as coolant leaks into the hydrogen or air path), thus realizing synchronous monitoring and detection of two-way leaks.

[0029] 2. Multi-parameter collaborative analysis: By combining threshold determinations for multiple parameters such as pressure drop, impedance, temperature, and rotational speed, the accuracy and reliability of leak detection are significantly improved. For example, by analyzing the difference in impedance between high-frequency and low-frequency frequencies, the type and path of the leak can be accurately distinguished.

[0030] 3. Adaptive adjustment function: When abnormal parameters are detected, the system can automatically adjust the operating conditions (such as the coolant pump speed) to try to correct the operating status, further eliminate the possibility of misjudgment, and ensure the accuracy of the diagnostic results. Attached Figure Description

[0031] Figure 1 This is a hardware structure block diagram of the detection device of the present invention;

[0032] Figure 2 This is a control diagram of the method for detecting gas leakage into the coolant circuit according to the present invention;

[0033] Figure 3 This is a control diagram of the method for detecting coolant leakage into the air path according to the present invention;

[0034] Explanation of reference numerals in the attached diagram: 1. Control module; 2. Storage module; 3. Transmission module; 4. Input module; 5. Output module; 6. Controlled system. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0036] The main objective of this invention is to provide a method and apparatus for diagnosing leaks in fuel cells, thereby solving the problem in the prior art that it is impossible to monitor whether there is bidirectional leakage between the gas path and the coolant path of the fuel cell during operation, and ensuring operational safety.

[0037] A fuel cell leak detection method includes a fuel cell and actual operating parameters during system operation. These parameters include pressure drop at the hydrogen inlet and outlet, pressure drop at the air inlet and outlet, fuel cell inlet and outlet temperatures, fuel cell impedance values ​​(high-frequency and low-frequency impedance values), coolant pump speed, water pump outlet pressure change, and fuel cell voltage change rate over a predetermined period. Based on these actual operating parameters and corresponding threshold values ​​(including hydrogen inlet and outlet pressure drop thresholds, air inlet and outlet pressure drop thresholds, coolant inlet and outlet temperature thresholds, fuel cell impedance thresholds (including high-frequency and low-frequency impedance thresholds), coolant pump speed thresholds, coolant pump outlet pressure change thresholds, and voltage change rate thresholds), the method determines whether a leak has occurred between the gas path and the coolant path. The system's operating condition parameters correspond to current values, and different operating condition parameters corresponding to different currents are pre-stored in the system's control module 1.

[0038] The system determines whether gas is leaking into the coolant path based on the fuel cell's coolant pump speed, coolant pump outlet pressure change, and coolant inlet and outlet temperatures and temperature difference within a predetermined time period. The thresholds used for this leak determination include: coolant pump speed threshold, coolant pump outlet pressure change threshold, and coolant inlet and outlet temperature threshold. The specific determination process is as follows:

[0039] S1: Obtain the actual operating parameters and corresponding thresholds during operation. The actual operating parameters include the fuel cell coolant pump speed, coolant pump outlet pressure change, and coolant circuit inlet and outlet temperatures and temperature difference. The thresholds include coolant pump speed threshold, coolant pump outlet pressure change threshold, and coolant circuit inlet and outlet temperature threshold.

[0040] For example: The predetermined time period is selected as 10 minutes; the fuel cell outlet temperature threshold is set to be 3°C greater than the set value; the inlet and outlet temperature difference is set to 10°C; the coolant pump speed threshold is set to be 5% greater than the set value; and the coolant pump outlet pressure change threshold and voltage change rate threshold are set according to actual conditions. (These thresholds are for reference only; users can modify them according to the actual situation of the fuel cell system, but the detection method remains the same.)

[0041] S2: If the change in coolant pump outlet pressure within a predetermined time period exceeds the coolant pump outlet pressure change threshold, proceed to S3.

[0042] S3: Determine if the outlet temperature of the fuel cell has increased to the outlet temperature threshold; otherwise, proceed to S7; otherwise, proceed to S4.

[0043] S4: Determine if the coolant pump speed has decreased to the coolant pump speed threshold; if not, proceed to S7; if yes, proceed to S5.

[0044] S5: Adjust the coolant pump speed and adjust the inlet and outlet temperatures to the normal range within the set temperature difference;

[0045] S6: Determine if the coolant pump speed is higher than the coolant pump speed threshold; if not, proceed to S7; if yes, proceed to S8.

[0046] S7: Investigate the cause of the abnormality and terminate the operation;

[0047] S8: If a gas leak is detected into the coolant circuit, the operation will be terminated.

[0048] First, determine if the change in the fuel cell water pump outlet pressure exceeds the set value within a predetermined time period under the same current. Then, determine if the fuel cell outlet temperature increases to the threshold and if the coolant pump speed decreases to the threshold. Next, adjust the coolant pump speed to bring the inlet and outlet temperatures to the normal range. If the coolant pump speed is higher than the threshold at this time, it can be determined that gas is leaking into the coolant circuit.

[0049] Figure 1 This is a hardware structure block diagram of a computing device. The method can be executed in a mobile terminal, computer terminal, or similar computing device. The computing device may include a control module 1, a storage module 2 for storing data, a transmission module 3, an input module 4, and an output module 5. The control module 1 is connected to the storage module 2, transmission module 3, input module 4, output module 5, and the controlled system 6.

[0050] Control module 1 executes various functional applications and data processing (system instructions, system operation condition setting instructions, determining if a condition exceeds a threshold, etc.). Storage module 2 can be used to store computer programs and data. Transmission module 3 converts specific numerical values ​​into analog quantities required by the output modules via a network: all data required by input module 4 and output module 5. Input module 4 is responsible for data input, and output module 5 is responsible for data output. The input data is the data collected by the sensors, and the output data is the specific instructions output to the actuators. The controlled system 6 is the actuator that implements the specific instructions.

[0051] The system determines whether coolant is leaking into the gas path based on the voltage change rate, pressure drop at the hydrogen inlet and outlet, pressure drop at the air inlet and outlet, and fuel cell impedance value within a predetermined time period.

[0052] First, determine if the voltage change rate reaches a threshold within a predetermined time period under the same current. Based on this, determine if the operating parameters are given according to preset values ​​(operating condition parameters correspond to current values). If the conditions deviate, first correct the operating condition parameters. If the voltage change rate does not improve significantly after correction, proceed to the next step.

[0053] S1: Obtain actual operating parameters and thresholds during operation: voltage change rate, hydrogen inlet and outlet pressure drop, air inlet and outlet pressure drop, and fuel cell impedance value within a predetermined time period; the thresholds involved include voltage change rate threshold, hydrogen inlet and outlet pressure drop threshold, air inlet and outlet pressure drop threshold, and fuel cell impedance threshold (including high-frequency impedance threshold and low-frequency impedance threshold).

[0054] For example: The predetermined time period is selected as 10 minutes; the voltage change rate threshold is set to be greater than the set value by 10%; the hydrogen inlet and outlet pressure drop threshold is set to be greater than the set value by 15%; the air inlet and outlet pressure drop threshold is set to be greater than the set value by 15%; and the fuel cell impedance thresholds (including high-frequency and low-frequency impedance thresholds) are set as follows: high-frequency impedance threshold is set to be greater than the set value by 5%; low-frequency impedance threshold is set to be greater than the set value by 5%. (These thresholds are for reference only; users can modify them according to the actual situation of the fuel cell system, but the detection method remains the same.)

[0055] S2: If the voltage change rate is greater than the voltage change rate threshold within a predetermined time period, proceed to S3;

[0056] S3: Determine if the operating conditions deviate from the set value: If the operating conditions deviate from the set value, the operating conditions are corrected. If the voltage change rate changes within its threshold after the operating conditions are corrected, the operation continues; if the operating conditions do not deviate from the set value, proceed to S4.

[0057] S4: Determine whether the pressure drop at the gas inlet and outlet is greater than its corresponding threshold, and whether the high-frequency and low-frequency impedances are greater than the fuel cell impedance threshold.

[0058] S5: Determine whether the increase in pressure drop at the inlet and outlet of the hydrogen path exceeds the pressure drop threshold at the inlet and outlet of the hydrogen path, and whether both high-frequency and low-frequency impedances increase, and whether the increase in high-frequency impedance exceeds the impedance threshold of the fuel cell; if the pressure drop at the inlet and outlet of the hydrogen path increases and exceeds the pressure drop threshold at the inlet and outlet of the hydrogen path, and both high-frequency and low-frequency impedances increase, and the increase in high-frequency impedance exceeds the impedance threshold of the fuel cell, then it is determined that there is a leak from the coolant path to the hydrogen path; otherwise, proceed to S5.

[0059] S6: If the pressure drop at the inlet and outlet of the air path increases and exceeds the pressure drop threshold at the inlet and outlet of the air path, both the high-frequency and low-frequency impedances increase, and the low-frequency impedance increases beyond the threshold, then it is determined that the coolant path is leaking into the hydrogen path.

[0060] S7: After investigating the cause of the abnormality, such as a leak in the coolant circuit into the hydrogen circuit or a leak in the coolant circuit into the air circuit, terminate the operation.

[0061] If the pressure drop at the inlet and outlet of both the hydrogen and air circuits exceeds the threshold, and the increase in both the high-frequency impedance and low-frequency impedance exceeds the threshold, coolant will leak into the hydrogen and air circuits.

[0062] This invention provides a method and apparatus for detecting fuel cell leaks, aiming to solve the problem of the inability of existing technologies to monitor bidirectional leaks between the fuel cell gas path and coolant path in real time and comprehensively, thereby improving the operational safety and efficiency of the fuel cell system. The method acquires multi-dimensional operational data in real time, including pressure drop at the inlet and outlet of the hydrogen path, pressure drop at the inlet and outlet of the air path, fuel cell impedance values ​​(including high-frequency and low-frequency impedance), coolant pump speed, water pump outlet pressure change, voltage change rate, and temperature parameters. This data is then dynamically compared with preset thresholds to comprehensively determine whether a leak exists between the gas path and coolant path. The apparatus of this invention can collect data in real time, perform threshold comparisons, and output control commands, achieving fully automated detection. Compared with existing technologies, it covers bidirectional leak scenarios in both the gas and coolant paths, filling a functional gap in existing detection systems. Through dynamic parameter correction and adaptive adjustment, fault response time is shortened, avoiding safety risks caused by fuel cell stack performance degradation or localized overheating due to leaks. The threshold parameters can be flexibly adjusted according to the fuel cell model and operating environment, exhibiting strong adaptability and facilitating widespread application. This invention provides a reliable guarantee for the safe operation of fuel cell systems and can be widely applied in new energy vehicles, stationary power plants, and other fields, with significant economic and social benefits.

Claims

1. A method of detecting a leak in a fuel cell, the method comprising: The actual operation parameters of the fuel cell are acquired, and threshold values corresponding to the parameters are set, the actual operation parameters including hydrogen path inlet and outlet pressure drop, air path inlet and outlet pressure drop, fuel cell inlet and outlet temperature, fuel cell impedance value, cooling liquid pump rotating speed, water pump outlet pressure change value, and fuel cell voltage change rate within a predetermined time period, wherein the fuel cell impedance value includes high frequency impedance value and low frequency impedance value; the threshold values corresponding to the actual operation parameters including hydrogen path inlet and outlet pressure drop threshold value, air path inlet and outlet pressure drop threshold value, cooling liquid path inlet and outlet temperature threshold value, fuel cell impedance threshold value, cooling liquid pump rotating speed threshold value, cooling liquid pump outlet pressure change threshold value, and voltage change rate threshold value, the fuel cell impedance threshold value including high frequency impedance threshold value and low frequency impedance threshold value; whether the bidirectional leakage between the gas path and the cooling liquid path occurs is determined according to the actual operation parameters and the threshold values corresponding to the parameters; The basis for judging whether the gas leaks to the cooling liquid path includes the cooling liquid pump rotating speed, the cooling liquid pump outlet pressure change value, the cooling liquid path inlet and outlet temperature, and the temperature difference within the predetermined time period, and the threshold values involved in the judging process include the cooling liquid pump rotating speed threshold value, the cooling liquid pump outlet pressure change threshold value, and the cooling liquid path inlet and outlet temperature threshold value; The basis for judging whether the cooling liquid leaks to the gas path includes the voltage change rate, the hydrogen path inlet and outlet pressure drop, the air path inlet and outlet pressure drop, the fuel cell impedance value, and the corresponding threshold values within the predetermined time period, and the threshold values involved in judging whether the cooling liquid leaks to the gas path include the voltage change rate threshold value, the hydrogen path inlet and outlet pressure drop threshold value, the air path inlet and outlet pressure drop threshold value, and the fuel cell impedance threshold value; The specific process of judging whether the gas leaks to the cooling liquid path is as follows, S1: acquiring the actual operation parameters in the running process and the threshold values corresponding to the parameters, the actual operation parameters including the cooling liquid pump rotating speed, the cooling liquid pump outlet pressure change value, the cooling liquid path inlet and outlet temperature, and the temperature difference; the threshold values include the cooling liquid pump rotating speed threshold value, the cooling liquid pump outlet pressure change threshold value, and the cooling liquid path inlet and outlet temperature threshold value; S2: when the cooling liquid pump outlet pressure change value within the predetermined time period is greater than the cooling liquid pump outlet pressure change threshold value, entering S3; S3: judging whether the outlet temperature of the fuel cell increases to the outlet temperature threshold value; if not, entering S7; if yes, entering S4; S4: judging whether the cooling liquid pump rotating speed decreases to the cooling liquid pump rotating speed threshold value; if not, entering S7; if yes, entering S5; S5: adjusting the cooling liquid pump rotating speed, and adjusting the inlet and outlet temperature to the normal range within the set temperature difference; S6: judging whether the cooling liquid pump rotating speed is higher than the cooling liquid pump rotating speed threshold value; if not, entering S7; if yes, entering S8; S7: troubleshooting the abnormal reason; ending the running; S8: determining that the gas leaks to the cooling liquid path; ending the running; The specific process of judging whether the cooling liquid leaks to the gas path is as follows: S1: obtaining actual operating parameters and threshold values during operation: voltage change rate, hydrogen path inlet and outlet pressure drop, air path inlet and outlet pressure drop, fuel cell impedance value in a predetermined time period; the threshold values involved include voltage change rate threshold value, hydrogen path inlet and outlet pressure drop threshold value, air path inlet and outlet pressure drop threshold value, fuel cell impedance threshold value (including high-frequency impedance threshold value and low-frequency impedance threshold value); S2: when the voltage change rate in the predetermined time period is greater than the voltage change rate threshold value, entering S3; S3: judging whether the operating conditions deviate from the set values: if the operating conditions deviate from the set values, correcting the operating conditions; if the voltage change rate changes within its threshold value after the operating conditions are corrected, continuing to operate; if the operating conditions do not deviate from the set values, entering S4; S4: judging whether the gas path inlet and outlet pressure drop is greater than the corresponding threshold value, and whether the high-frequency and low-frequency impedances are greater than the fuel cell impedance threshold value; S5: judging whether the hydrogen path inlet and outlet pressure drop increases and exceeds the hydrogen path inlet and outlet pressure drop threshold value, whether the high-frequency and low-frequency impedances both increase, and whether the high-frequency impedance increase exceeds the fuel cell impedance threshold value; if the hydrogen path inlet and outlet pressure drop increases and exceeds the hydrogen path inlet and outlet pressure drop threshold value, the high-frequency and low-frequency impedances both increase, and the high-frequency impedance increase exceeds the fuel cell impedance threshold value, it is judged that the cooling liquid path leaks to the hydrogen path; if not, entering S5; S6: if the air path inlet and outlet pressure drop increases and exceeds the air path inlet and outlet pressure drop threshold value, the high-frequency and low-frequency impedances both increase, and the low-frequency impedance increase exceeds the threshold value, it is determined that the cooling liquid path leaks to the hydrogen path; S7: troubleshooting the abnormal reasons, cooling liquid path leaking to the hydrogen path or cooling liquid path leaking to the air path, and ending the operation.

2. A fuel cell leak detection apparatus, characterized by: The device includes a control module (1), which is connected to a storage module (2), a transmission module (3), an input module (4), an output module (5), and a controlled system (6). The device obtains actual operating parameters and stores parameter set threshold values.

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