Method and device for diagnosing leakage of fuel cell, and fuel cell engine

Abstract

The application provides a fuel cell leakage diagnosis method and device and a fuel cell engine. The fuel cell comprises a plurality of battery monomers in series. The method comprises: obtaining actual operation parameters of the fuel cell during operation, the actual operation parameters comprising a pressure drop of a hydrogen cavity inlet and outlet, a hydrogen concentration of a cooling liquid cavity, an ion concentration change rate of the cooling liquid cavity within a predetermined period, and a voltage change rate of each battery monomer within the predetermined period; and determining whether leakage occurs between the hydrogen cavity and the cooling liquid cavity according to the actual operation parameters and corresponding parameter thresholds. The application at least solves the problem in the prior art that the fuel cell cannot be monitored to determine whether leakage exists between the hydrogen cavity and the cooling liquid cavity during operation, thereby causing poor safety.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, and more specifically, to a method, apparatus, computer-readable storage medium, computer program product, and fuel cell engine for diagnosing fuel cell leaks. Background Technology

[0002] With the development of fuel cell technology, the thickness of fuel cell plates is constantly decreasing. During the operation of fuel cells, it is necessary to strictly limit cross-leakage between the coolant chamber and the gas chamber, especially between the hydrogen chamber and the coolant chamber. On the one hand, if hydrogen enters the coolant chamber, it will cause hydrogen accumulation in the coolant, creating a safety hazard. On the other hand, if the coolant, whose main component is ethylene glycol solution, enters the air chamber or the hydrogen chamber, it will cause contamination of the membrane electrode assembly, reduce its performance, and thus affect the durability of the product.

[0003] In existing technologies, after the engine is assembled, an airtightness test is generally used to determine whether there is a leak between the hydrogen chamber and the coolant chamber. However, it is impossible to monitor whether there is a leak between the hydrogen chamber and the coolant chamber during operation, which results in poor safety during engine operation. Summary of the Invention

[0004] The main objective of this application is to provide a method, apparatus, computer-readable storage medium, computer program product, and fuel cell engine for diagnosing leaks in fuel cells, so as to at least solve the problem in the prior art that it is impossible to monitor whether there is a leak between the hydrogen chamber and the coolant chamber of the fuel cell during operation, resulting in poor safety.

[0005] To achieve the above objectives, according to one aspect of this application, a method for diagnosing leaks in a fuel cell is provided. The fuel cell includes multiple cells connected in series. The method includes: acquiring actual operating parameters of the fuel cell during operation, including the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration in the coolant chamber, the rate of change of ion concentration in the coolant chamber over a predetermined period, and the rate of change of voltage of each cell over the predetermined period; and determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the actual operating parameters and corresponding parameter thresholds.

[0006] Optionally, determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the actual operating parameters and corresponding parameter thresholds includes: obtaining a first relationship between the hydrogen concentration of the fuel cell and one of the corresponding parameter thresholds and the operating temperature of the fuel cell; obtaining a second relationship between the remaining operating parameters of the fuel cell and one of the corresponding parameter thresholds and the operating current of the fuel cell, wherein the remaining operating parameters are the actual operating parameters excluding the hydrogen concentration; correcting one of the hydrogen concentration and the corresponding parameter thresholds based on the current operating temperature of the fuel cell and the first relationship to obtain first information, wherein the other of the hydrogen concentration and the corresponding parameter thresholds is second information; correcting one of the remaining operating parameters and the corresponding parameter thresholds based on the current operating current of the fuel cell and the second relationship to obtain third information, wherein the other of the remaining operating parameters and the corresponding parameter thresholds is fourth information; and determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the first information, the second information, the third information, and the fourth information.

[0007] Optionally, the first information includes a hydrogen concentration threshold, and the third information includes an ion concentration change rate threshold, a pressure drop threshold, and a voltage change rate threshold. Determining whether a leak occurs between the hydrogen chamber and the coolant chamber based on the first information, the second information, the third information, and the fourth information includes: if the hydrogen concentration is greater than the hydrogen concentration threshold, determining that the hydrogen concentration in the coolant chamber exceeds the limit; and calculating the proportion of voltage change rates exceeding the voltage change rate threshold based on multiple voltage change rates and the voltage change rate threshold; determining whether the proportion is less than or equal to a first proportion, whether the ion concentration change rate is greater than the ion concentration change rate threshold, and whether the inlet / outlet pressure drop is greater than the pressure drop threshold; and determining that a leak occurs between the hydrogen chamber and the coolant chamber if the proportion is less than and equal to the first proportion, the ion concentration change rate is greater than the ion concentration change rate threshold, and the inlet / outlet pressure drop is greater than the pressure drop threshold.

[0008] Optionally, the method further includes: when the proportion is greater than or equal to the second proportion, controlling the fuel cell to stop operating and issuing a first alarm message, the first alarm message being information indicating that the fuel cell has malfunctioned, and the second proportion being greater than the first proportion; when the proportion is greater than the first proportion and less than the second proportion, controlling the fuel cell to continue operating and issuing a second alarm message, the second alarm message being information indicating that the voltage of some of the battery cells has decreased.

[0009] Optionally, the method further includes: issuing a third alarm message when the proportion is less than or equal to the first proportion, the ion concentration change rate is greater than the ion concentration change rate threshold, and the inlet / outlet pressure drop is less than or equal to the pressure drop threshold, wherein the third alarm message is information characterizing the detection of the ion precipitation rate of the pipeline connected to the coolant chamber.

[0010] Optionally, the first relationship includes the historical threshold corresponding to the hydrogen concentration and the historical operating temperature. Based on the current operating temperature of the fuel cell and the first relationship, one of the hydrogen concentration and the corresponding parameter threshold is corrected to obtain first information, including: determining a temperature correction coefficient as the ratio of the current operating temperature to the historical operating temperature based on the current operating temperature and the historical operating temperature; determining the first information as the product of the temperature correction coefficient and the parameter threshold corresponding to the hydrogen concentration based on the temperature correction coefficient. The second relationship includes the historical threshold corresponding to the remaining operating parameters and the historical operating current. Based on the current operating current of the fuel cell and the second relationship, one of the remaining operating parameters and the corresponding parameter threshold is corrected to obtain third information, including: determining a current correction coefficient as the ratio of the current operating current to the historical operating current based on the current operating current and the historical operating current; determining the third information as the product of the current correction coefficient and the parameter threshold corresponding to the remaining operating parameters based on the current correction coefficient.

[0011] According to another aspect of this application, a leak diagnosis device for a fuel cell is provided. The fuel cell includes multiple cells connected in series. The device includes: an acquisition unit for acquiring actual operating parameters of the fuel cell during operation, the actual operating parameters including the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration of the coolant chamber, the rate of change of ion concentration in the coolant chamber within a predetermined time period, and the rate of change of voltage of each cell within the predetermined time period; and a determination unit for determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the actual operating parameters and corresponding parameter thresholds.

[0012] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform any of the methods described.

[0013] According to another aspect of this application, a computer program product is provided, including computer instructions that, when executed by a processor, implement any of the methods described.

[0014] According to another aspect of this application, a fuel cell engine is provided, comprising: a fuel cell including a plurality of battery cells connected in series; one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing any one of the methods described.

[0015] By applying the technical solution of this application, the actual operating parameters of the fuel cell during operation are first obtained, including the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber within a predetermined time period, and the voltage change rate of each cell within a predetermined time period. Then, based on the obtained actual operating parameters and corresponding parameter thresholds, it is determined whether leakage has occurred between the hydrogen chamber and the coolant chamber. Compared to the prior art, which only tests the airtightness of the hydrogen chamber-coolant chamber after engine assembly and cannot monitor for leakage during operation, resulting in poor safety during fuel cell operation, this application determines whether leakage has occurred between the hydrogen chamber and the coolant chamber by comparing the actual operating parameters such as the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber, and the voltage change rate of each cell with their corresponding parameter thresholds. This achieves monitoring of whether leakage occurs between the hydrogen chamber and the coolant chamber during fuel cell operation, ensuring high safety of the fuel cell during operation. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 A hardware structure block diagram of a mobile terminal for performing a fuel cell leak diagnosis method according to an embodiment of this application is shown.

[0018] Figure 2 A schematic flowchart of a leak diagnosis method for a fuel cell according to an embodiment of this application is shown.

[0019] Figure 3 A schematic flowchart of another fuel cell leak diagnosis method provided according to an embodiment of this application is shown;

[0020] Figure 4 A schematic flowchart of another method for diagnosing leaks in a fuel cell according to an embodiment of this application is shown.

[0021] Figure 5A schematic diagram of a leak diagnosis process for a fuel cell according to an embodiment of this application is shown;

[0022] Figure 6 A structural block diagram of a fuel cell leak diagnosis device provided according to an embodiment of this application is shown.

[0023] The above figures include the following reference numerals:

[0024] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] As described in the background section, existing technologies cannot monitor whether there is leakage between the hydrogen chamber and the coolant chamber of a fuel cell during operation, resulting in poor safety. To solve the above technical problems, embodiments of this application provide a method, apparatus, computer-readable storage medium, computer program product, and fuel cell engine for diagnosing fuel cell leaks.

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a fuel cell leak diagnosis method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0031] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the fuel cell leak diagnosis method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0032] This embodiment provides a method for diagnosing leaks in a fuel cell that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0033] Figure 2 This is a flowchart of a fuel cell leak diagnosis method according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0034] Step S201: Obtain the actual operating parameters of the fuel cell during operation. The actual operating parameters include the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration of the coolant chamber, the rate of change of ion concentration in the coolant chamber within a predetermined time period, and the rate of change of voltage of each of the aforementioned battery cells within the predetermined time period.

[0035] Specifically, an inlet pressure sensor is installed at the hydrogen chamber inlet, and an outlet pressure sensor is installed at the hydrogen chamber outlet. The inlet pressure sensor collects the inlet pressure of the hydrogen chamber, and the outlet pressure sensor collects the outlet pressure of the hydrogen chamber. The inlet-outlet pressure drop is calculated as the difference between the inlet pressure and the outlet pressure. The coolant chamber is equipped with a hydrogen concentration sensor and an ion concentration sensor. The hydrogen concentration sensor collects the hydrogen concentration in the coolant chamber, and the ion concentration sensor collects the ion concentration in the coolant chamber at various times. Based on the obtained ion concentrations at multiple times, the ion concentration change rate within the predetermined time period is calculated. The individual cell voltage is collected at various times using a single-cell voltage acquisition structure, and based on the obtained individual cell voltages at multiple times for each individual cell, the voltage change rate within the predetermined time period is calculated.

[0036] Step S202: Based on the actual operating parameters and corresponding parameter thresholds, determine whether a leak has occurred between the hydrogen chamber and the coolant chamber.

[0037] Specifically, the aforementioned parameter thresholds include the threshold for the inlet / outlet pressure drop, the threshold for the hydrogen concentration, the threshold for the rate of change of the ion concentration, and the threshold for the rate of change of the voltage.

[0038] Through the above embodiments, the actual operating parameters of the fuel cell during operation are first obtained, including the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber within a predetermined time period, and the voltage change rate of each cell within a predetermined time period. Then, based on the obtained actual operating parameters and corresponding parameter thresholds, it is determined whether leakage has occurred between the hydrogen chamber and the coolant chamber. Compared to the prior art, which only tests the airtightness of the hydrogen chamber-coolant chamber after engine assembly and cannot monitor for leakage during operation, resulting in poor safety during fuel cell operation, this application determines whether leakage has occurred between the hydrogen chamber and the coolant chamber by comparing the actual operating parameters such as the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber, and the voltage change rate of each cell with corresponding parameter thresholds during fuel cell operation. This achieves monitoring of whether leakage occurs between the hydrogen chamber and the coolant chamber during fuel cell operation, ensuring high safety of the fuel cell during operation.

[0039] Furthermore, the fuel cell leakage diagnosis method described above in this application introduces the rate of change (voltage change rate and ion concentration change rate) within a fixed time period to determine whether there is a leak, thus avoiding false alarms caused by parameter changes due to changes in the characteristics of the fuel cell itself caused by the increase in operating time.

[0040] Specifically, if a leak is found between the hydrogen chamber and the coolant chamber, the method further includes: shutting down the fuel cell to perform maintenance on the fuel cell.

[0041] In one alternative, such as Figure 3 As shown, step S202: Based on the actual operating parameters and corresponding parameter thresholds, determine whether a leak has occurred between the hydrogen chamber and the coolant chamber, including:

[0042] Step S2021: Obtain the correspondence between the hydrogen concentration of the fuel cell and one of the above parameter thresholds and the operating temperature of the fuel cell, and obtain the first relationship;

[0043] Specifically, the first relationship mentioned above is the correspondence between hydrogen concentration and operating temperature, or the correspondence between the threshold of hydrogen concentration and operating temperature.

[0044] Step S2022: Obtain the correspondence between the remaining operating parameters of the fuel cell and one of the corresponding parameter thresholds and the operating current of the fuel cell, to obtain a second relationship. The remaining operating parameters are the actual operating parameters other than the hydrogen concentration.

[0045] Specifically, the second relationship includes the correspondence between inlet / outlet voltage drop, ion concentration change rate, and voltage change rate and operating current, or the correspondence between the threshold values ​​of inlet / outlet voltage drop, ion concentration change rate, and voltage change rate and operating current.

[0046] Step S2023: Based on the current operating temperature of the fuel cell and the first relationship, the hydrogen concentration and one of the corresponding parameter thresholds are corrected to obtain first information, and the other of the hydrogen concentration and the corresponding parameter thresholds is second information.

[0047] Specifically, when the first relationship is a correspondence between hydrogen concentration and operating temperature, the hydrogen concentration is corrected based on the current operating temperature and the first relationship to obtain the first information, and the parameter threshold corresponding to the hydrogen concentration is the second information. Alternatively, when the first relationship is a correspondence between a hydrogen concentration threshold and operating temperature, the parameter threshold corresponding to the hydrogen concentration is corrected based on the current operating temperature and the first relationship to obtain the first information, and the hydrogen concentration is the second information.

[0048] Step S2024: Based on the current operating current of the fuel cell and the second relationship, one of the remaining operating parameters and the corresponding parameter thresholds is corrected to obtain the third information. The other of the remaining operating parameters and the corresponding parameter thresholds is the fourth information.

[0049] Specifically, given the second relationship as the correspondence between inlet / outlet voltage drop, ion concentration change rate, voltage change rate, and operating current, the inlet / outlet voltage drop, ion concentration change rate, and voltage change rate are corrected based on the current operating current and the second relationship to obtain the third information. The parameter thresholds corresponding to these parameters are then considered the fourth information.

[0050] Step S2025: Based on the first information, the second information, the third information and the fourth information mentioned above, determine whether a leak has occurred between the hydrogen chamber and the coolant chamber.

[0051] Since the hydrogen concentration and its threshold in a fuel cell are related to the fuel cell's operating temperature, while the inlet / outlet pressure drop, ion concentration change rate, and voltage change rate and their thresholds are related to the fuel cell's operating current, and the operating temperature and operating current of a fuel cell vary at different operating stages, in order to further ensure that the leakage of the hydrogen chamber-coolant chamber of the fuel cell under the current operating temperature and current is determined more accurately and to avoid false alarms, the above embodiment first corrects the actual operating parameters or parameter thresholds based on the correspondence between hydrogen concentration or threshold and operating temperature, and the correspondence between remaining operating parameters or thresholds and operating current. This ensures that the corrected actual operating parameters or parameter thresholds are more closely matched with the current operating conditions of the fuel cell and are more accurate. Then, the corrected actual operating parameters are compared with the parameter thresholds, or the actual operating parameters are compared with the corrected parameter thresholds, to determine whether there is leakage between the chambers, thus further realizing accurate monitoring of whether there is leakage between the chambers of the fuel cell during operation.

[0052] Specifically, the hydrogen concentration mentioned above refers to the concentration of hydrogen in the expansion tank.

[0053] To further address the problem in existing technologies where leakage between the hydrogen chamber and coolant chamber of a fuel cell cannot be monitored during operation, resulting in poor safety, according to another exemplary embodiment of this application, the first information includes a hydrogen concentration threshold, and the third information includes an ion concentration change rate threshold, a pressure drop threshold, and a voltage change rate threshold. This is achieved by correcting the aforementioned parameter thresholds to obtain the first and third information, while the actual operating parameters such as hydrogen concentration, inlet / outlet pressure drop, ion concentration change rate, and voltage change rate are not corrected, constituting the second and fourth information. In this case, such as Figure 4 As shown, step S2025: Based on the first information, the second information, the third information, and the fourth information, determine whether a leak has occurred between the hydrogen chamber and the coolant chamber, including:

[0054] Step S20251: When the hydrogen concentration is greater than the hydrogen concentration threshold, it is determined that the hydrogen concentration in the coolant chamber exceeds the standard, and the proportion of the voltage change rate exceeding the voltage change rate threshold is calculated based on the multiple voltage change rates and the voltage change rate threshold.

[0055] Step S20252: Determine whether the above proportion is less than or equal to the first proportion, whether the above ion concentration change rate is greater than the above ion concentration change rate threshold, and whether the above inlet / outlet pressure drop is greater than the above pressure drop threshold.

[0056] Step S20253: If the above proportion is less than or equal to the above first proportion, the above ion concentration change rate is greater than the above ion concentration change rate threshold, and the above inlet / outlet pressure drop is greater than the above pressure drop threshold, it is determined that a leak has occurred between the above hydrogen chamber and the above coolant chamber.

[0057] In addition to the above methods, in other exemplary embodiments, the first information includes the corrected hydrogen concentration, and the third information includes the corrected ion concentration change rate, the corrected inlet and outlet pressure drop, and the corrected voltage change rate. That is, the first information and the third information are obtained by correcting the actual operating parameters. However, the threshold values ​​of parameters such as hydrogen concentration threshold, ion concentration change rate threshold, pressure drop threshold, and voltage change rate threshold are not corrected, and constitute the second information and the fourth information. In this case, determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the first, second, third, and fourth information mentioned above includes: if the corrected hydrogen concentration is greater than the hydrogen concentration threshold, determining that the hydrogen concentration in the coolant chamber exceeds the limit, and calculating the proportion of the corrected voltage change rate exceeding the voltage change rate threshold based on multiple corrected voltage change rates and the voltage change rate threshold; determining whether the proportion is less than or equal to a first ratio, whether the corrected ion concentration change rate is greater than the ion concentration change rate threshold, and whether the corrected inlet / outlet pressure drop is greater than the pressure drop threshold; and determining that a leak has occurred between the hydrogen chamber and the coolant chamber if the proportion is less than or equal to the first ratio, the corrected ion concentration change rate is greater than the ion concentration change rate threshold, and the corrected inlet / outlet pressure drop is greater than the pressure drop threshold.

[0058] In this embodiment, the method further includes: when the percentage is greater than or equal to the second percentage, controlling the fuel cell to stop operating and issuing a first alarm message, the first alarm message indicating a malfunction in the fuel cell, and the second percentage being greater than the first percentage; when the percentage is greater than the first percentage but less than the second percentage, controlling the fuel cell to continue operating and issuing a second alarm message, the second alarm message indicating a decrease in the voltage of some of the battery cells. In this embodiment, by determining the percentage of cell voltage change rates exceeding a voltage change rate threshold, a large percentage indicates a fuel cell malfunction. At this time, issuing a first alarm message reminds relevant personnel to stop the fuel cell for inspection and troubleshooting, avoiding the problem of reduced fuel cell lifespan due to continued operation in a malfunctioning state. When the percentage is greater than the first percentage but less than the second percentage, it indicates that only some battery cells have an increased voltage change rate. In this case, the fuel cell can continue operating, and issuing a second alarm message alerts relevant personnel to the decrease in the voltage of some battery cells, allowing them to simultaneously investigate the cause. This further ensures the safety and durability of the fuel cell without delaying its normal operation.

[0059] In one alternative, the first ratio can be 10%, and the second ratio can be 80%.

[0060] Furthermore, the method described in this application also includes: issuing a third alarm message when the aforementioned proportion is less than or equal to the aforementioned first proportion, the aforementioned ion concentration change rate is greater than the aforementioned ion concentration change rate threshold, and the aforementioned inlet / outlet pressure drop is less than or equal to the aforementioned pressure drop threshold. The third alarm message is information characterizing the detection of the ion deposition rate of the pipeline connected to the aforementioned coolant chamber. When the above conditions occur, it indicates a potential problem with the ion deposition capacity of the coolant chamber pipeline. Issuing a third alarm message at this time prompts relevant personnel to investigate the ion deposition rate of the coolant chamber pipeline, enabling timely detection of faults and further ensuring the safe operation of the fuel cell and improving its durability.

[0061] To further avoid false alarms that may be caused by fixed thresholds, the aforementioned first relationship includes the historical threshold corresponding to the hydrogen concentration and the historical operating temperature. Based on the current operating temperature of the fuel cell and the aforementioned first relationship, one of the hydrogen concentration and the corresponding parameter threshold is corrected to obtain first information, including: determining a temperature correction coefficient as the ratio of the current operating temperature to the historical operating temperature based on the current operating temperature and the historical operating temperature; and determining the first information as the product of the temperature correction coefficient and the parameter threshold corresponding to the hydrogen concentration based on the temperature correction coefficient. In the above embodiment, correcting the parameter threshold corresponding to the hydrogen concentration based on the operating temperature further avoids the problem of false alarms.

[0062] Of course, in addition to the methods described above, the first relationship includes the historical threshold and historical operating temperature corresponding to the hydrogen concentration. Based on the current operating temperature of the fuel cell and the first relationship, the hydrogen concentration and one of the corresponding parameter thresholds are corrected to obtain first information, including: determining a temperature correction coefficient as the ratio of the current operating temperature to the historical operating temperature based on the current operating temperature and the historical operating temperature; and determining the first information as the product of the temperature correction coefficient and the hydrogen concentration based on the temperature correction coefficient. In the above embodiments, correcting the hydrogen concentration based on the operating temperature further avoids false alarms.

[0063] To further avoid false alarms that may be caused by fixed thresholds, the second relationship mentioned above further includes the historical thresholds and historical operating currents corresponding to the remaining operating parameters. Based on the current operating current of the fuel cell and the second relationship mentioned above, one of the remaining operating parameters and the corresponding parameter thresholds is corrected to obtain third information, including: determining the current correction coefficient as the ratio of the current operating current to the historical operating current based on the current operating current and the historical operating current; and determining the third information as the product of the current correction coefficient and the parameter thresholds corresponding to the remaining operating parameters based on the current correction coefficient.

[0064] Of course, in addition to the above methods, the second relationship also includes the remaining operating parameters and historical operating current. Based on the current operating current of the fuel cell and the second relationship, one of the remaining operating parameters and the corresponding parameter thresholds is corrected to obtain the third information, including: determining the current correction coefficient as the ratio of the current operating current to the historical operating current based on the current operating current and the historical operating current; and determining the third information as the product of the current correction coefficient and the parameter thresholds corresponding to the remaining operating parameters based on the current correction coefficient.

[0065] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the fuel cell leakage diagnosis method of this application will be described in detail below with reference to specific embodiments.

[0066] This embodiment relates to a specific method for diagnosing leaks in a fuel cell, such as... Figure 5 As shown, it includes the following steps:

[0067] Step S1: Obtain the outlet pressure and inlet pressure of the hydrogen chamber, the hydrogen concentration of the coolant chamber, the rate of change of ion concentration in the coolant chamber within a predetermined time period, and the voltage change rate of each cell during the operation of the fuel cell engine. Calculate the inlet pressure drop as the difference between the inlet pressure and the outlet pressure based on the outlet pressure and inlet pressure. Then proceed to step S2.

[0068] Step S2: Obtain the initial threshold for hydrogen concentration. Since the hydrogen concentration needs to be calibrated under different currents during the development of the fuel cell engine, and this concentration is related to the operating temperature, the temperature value is used to calibrate the initial threshold to obtain the hydrogen concentration threshold. Obtain the initial thresholds for ion concentration change rate, pressure drop, and voltage change rate. Since the operating current of the engine is inconsistent in different operating stages, a current correction coefficient is added to these initial thresholds to obtain the ion concentration change rate threshold, pressure drop threshold, and voltage change rate threshold. Then, proceed to step S3.

[0069] Step S3: If the hydrogen concentration is greater than the hydrogen concentration threshold, determine whether the proportion of voltage change rate greater than the voltage change rate threshold is not greater than the first proportion (which can be 10%). If yes, proceed to step S4; otherwise, proceed to step S6.

[0070] Step S4: Determine whether the rate of change of ion concentration is greater than the threshold of the rate of change of ion concentration. If yes, proceed to step S5; otherwise, proceed to step S1.

[0071] Step S5: Determine whether the pressure drop at the inlet and outlet is greater than the pressure drop threshold. If so, it is determined that there is a leakage between the hydrogen chamber and the coolant chamber in the fuel cell engine. If not, check whether the ion precipitation in the coolant chamber pipeline exceeds the standard.

[0072] Step S6: Determine whether the proportion of voltage change rates greater than the voltage change rate threshold is not less than the second proportion (which can be 80%). If so, check the hydrogen quality; if not, check the cause of abnormal decay.

[0073] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0074] This application also provides a fuel cell leak diagnosis device. It should be noted that the fuel cell leak diagnosis device of this application can be used to execute the fuel cell leak diagnosis method provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0075] The following describes the fuel cell leak diagnosis device provided in the embodiments of this application.

[0076] Figure 6 This is a schematic diagram of a fuel cell leak diagnosis device according to an embodiment of this application. Figure 6 As shown, the device includes:

[0077] The acquisition unit 10 is used to acquire the actual operating parameters of the fuel cell during operation. The actual operating parameters include the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration of the coolant chamber, the rate of change of ion concentration of the coolant chamber within a predetermined time period, and the rate of change of voltage of each of the battery cells within the predetermined time period.

[0078] Specifically, an inlet pressure sensor is installed at the hydrogen chamber inlet, and an outlet pressure sensor is installed at the hydrogen chamber outlet. The inlet pressure sensor collects the inlet pressure of the hydrogen chamber, and the outlet pressure sensor collects the outlet pressure of the hydrogen chamber. The inlet-outlet pressure drop is calculated as the difference between the inlet pressure and the outlet pressure. The coolant chamber is equipped with a hydrogen concentration sensor and an ion concentration sensor. The hydrogen concentration sensor collects the hydrogen concentration in the coolant chamber, and the ion concentration sensor collects the ion concentration in the coolant chamber at various times. Based on the obtained ion concentrations at multiple times, the ion concentration change rate within the predetermined time period is calculated. The individual cell voltage is collected at various times using a single-cell voltage acquisition structure, and based on the obtained individual cell voltages at multiple times for each individual cell, the voltage change rate within the predetermined time period is calculated.

[0079] The determining unit 20 is used to determine whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the actual operating parameters and the corresponding parameter thresholds.

[0080] Specifically, the aforementioned parameter thresholds include the threshold for the inlet / outlet pressure drop, the threshold for the hydrogen concentration, the threshold for the rate of change of the ion concentration, and the threshold for the rate of change of the voltage.

[0081] Through the above embodiments, the acquisition unit acquires actual operating parameters of the fuel cell during operation, such as the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber within a predetermined time period, and the voltage change rate of each cell within a predetermined time period. The determination unit determines whether leakage has occurred in the hydrogen chamber and coolant chamber based on the acquired actual operating parameters and corresponding parameter thresholds. Compared with the prior art, which only tests the airtightness of the hydrogen chamber-coolant chamber after engine assembly and cannot monitor whether leakage occurs between the hydrogen chamber and coolant chamber during operation, resulting in poor safety during fuel cell operation, this application determines whether leakage has occurred between the hydrogen chamber and coolant chamber by comparing the actual operating parameters such as the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber, and the voltage change rate of each cell with the corresponding parameter thresholds during fuel cell operation. This achieves monitoring of whether leakage occurs in the hydrogen chamber-coolant chamber of the fuel cell during operation, ensuring high safety of the fuel cell during operation.

[0082] Furthermore, the fuel cell leak diagnosis device described above in this application introduces the rate of change (voltage change rate and ion concentration change rate) within a fixed time period to determine whether there is a leak, thus avoiding false alarms caused by parameter changes due to changes in the characteristics of the fuel cell itself caused by the increase in operating time.

[0083] Specifically, the device further includes a first control unit, used to control the fuel cell to shut down in order to perform maintenance on the fuel cell if a leak is detected between the hydrogen chamber and the coolant chamber.

[0084] In one alternative embodiment, the determining unit includes:

[0085] The first acquisition module is used to acquire the correspondence between the hydrogen concentration of the fuel cell and one of the corresponding parameter thresholds and the operating temperature of the fuel cell, thereby obtaining a first relationship.

[0086] Specifically, the first relationship mentioned above is the correspondence between hydrogen concentration and operating temperature, or the correspondence between the threshold of hydrogen concentration and operating temperature.

[0087] The second acquisition module is used to acquire the relationship between the remaining operating parameters of the fuel cell and the corresponding parameter threshold and the operating current of the fuel cell, and to obtain a second relationship. The remaining operating parameters are the actual operating parameters other than the hydrogen concentration.

[0088] Specifically, the second relationship includes the correspondence between inlet / outlet voltage drop, ion concentration change rate, and voltage change rate and operating current, or the correspondence between the threshold values ​​of inlet / outlet voltage drop, ion concentration change rate, and voltage change rate and operating current.

[0089] The first correction module is used to correct one of the hydrogen concentration and the corresponding parameter threshold based on the current operating temperature of the fuel cell and the first relationship to obtain first information, and the other of the hydrogen concentration and the corresponding parameter threshold is second information.

[0090] Specifically, when the first relationship is a correspondence between hydrogen concentration and operating temperature, the hydrogen concentration is corrected based on the current operating temperature and the first relationship to obtain the first information, and the parameter threshold corresponding to the hydrogen concentration is the second information. Alternatively, when the first relationship is a correspondence between a hydrogen concentration threshold and operating temperature, the parameter threshold corresponding to the hydrogen concentration is corrected based on the current operating temperature and the first relationship to obtain the first information, and the hydrogen concentration is the second information.

[0091] The second correction module is used to correct one of the remaining operating parameters and the corresponding parameter thresholds based on the current operating current of the fuel cell and the second relationship, to obtain third information. The other of the remaining operating parameters and the corresponding parameter thresholds is fourth information.

[0092] Specifically, given the second relationship as the correspondence between inlet / outlet voltage drop, ion concentration change rate, voltage change rate, and operating current, the inlet / outlet voltage drop, ion concentration change rate, and voltage change rate are corrected based on the current operating current and the second relationship to obtain the third information. The parameter thresholds corresponding to these parameters are then considered the fourth information.

[0093] The determination module is used to determine whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the first information, the second information, the third information and the fourth information.

[0094] Since the hydrogen concentration and its threshold in a fuel cell are related to the fuel cell's operating temperature, while the inlet / outlet pressure drop, ion concentration change rate, and voltage change rate and their thresholds are related to the fuel cell's operating current, and the operating temperature and operating current of a fuel cell vary at different operating stages, in order to further ensure that the leakage of the hydrogen chamber-coolant chamber of the fuel cell under the current operating temperature and current is determined more accurately and to avoid false alarms, the above embodiment first corrects the actual operating parameters or parameter thresholds based on the correspondence between hydrogen concentration or threshold and operating temperature, and the correspondence between remaining operating parameters or thresholds and operating current. This ensures that the corrected actual operating parameters or parameter thresholds are more closely matched with the current operating conditions of the fuel cell and are more accurate. Then, the corrected actual operating parameters are compared with the parameter thresholds, or the actual operating parameters are compared with the corrected parameter thresholds, to determine whether there is leakage between the chambers, thus further realizing accurate monitoring of whether there is leakage between the chambers of the fuel cell during operation.

[0095] Specifically, the hydrogen concentration mentioned above refers to the concentration of hydrogen in the expansion tank.

[0096] To further address the problem in existing technologies where leakage between the hydrogen chamber and coolant chamber of a fuel cell cannot be monitored during operation, resulting in poor safety, according to another exemplary embodiment of this application, the first information includes a hydrogen concentration threshold, and the third information includes an ion concentration change rate threshold, a pressure drop threshold, and a voltage change rate threshold. That is, the first and third information are obtained by correcting the aforementioned parameter thresholds, while the actual operating parameters such as hydrogen concentration, inlet / outlet pressure drop, ion concentration change rate, and voltage change rate are not corrected, constituting the second and fourth information. In this case, the determining module includes:

[0097] The first determining submodule is used to determine that the hydrogen concentration in the cooling liquid chamber exceeds the standard when the hydrogen concentration is greater than the hydrogen concentration threshold, and to calculate the proportion of the voltage change rate exceeding the voltage change rate threshold based on multiple voltage change rates and the voltage change rate threshold.

[0098] The second determining submodule is used to determine whether the above proportion is less than or equal to the first proportion, whether the above ion concentration change rate is greater than the above ion concentration change rate threshold, and whether the above inlet and outlet pressure drop is greater than the above pressure drop threshold.

[0099] The third determining submodule is used to determine that a leak has occurred between the hydrogen chamber and the coolant chamber when the above proportion is less than or equal to the above first proportion, the above ion concentration change rate is greater than the above ion concentration change rate threshold, and the above inlet / outlet pressure drop is greater than the above pressure drop threshold.

[0100] In addition to the above methods, in other exemplary embodiments, the first information includes the corrected hydrogen concentration, and the third information includes the corrected ion concentration change rate, the corrected inlet and outlet pressure drop, and the corrected voltage change rate. That is, the first information and the third information are obtained by correcting the actual operating parameters. However, the threshold values ​​of parameters such as hydrogen concentration threshold, ion concentration change rate threshold, pressure drop threshold, and voltage change rate threshold are not corrected, and constitute the second information and the fourth information. In this case, the aforementioned determining module includes: a fourth determining submodule, used to determine that the hydrogen concentration in the coolant chamber exceeds the standard when the corrected hydrogen concentration is greater than the hydrogen concentration threshold, and to calculate the proportion of the corrected voltage change rate exceeding the voltage change rate threshold based on multiple corrected voltage change rates and the voltage change rate threshold; a fifth determining submodule, used to determine whether the proportion is less than or equal to a first proportion, whether the corrected ion concentration change rate is greater than the ion concentration change rate threshold, and whether the corrected inlet / outlet pressure drop is greater than the pressure drop threshold; and a sixth determining submodule, used to determine that leakage occurs between the hydrogen chamber and the coolant chamber when the proportion is less than or equal to the first proportion, the corrected ion concentration change rate is greater than the ion concentration change threshold, and the corrected inlet / outlet pressure drop is greater than the pressure drop threshold.

[0101] In this embodiment, the device further includes: a second control unit, configured to control the fuel cell to stop operating and issue a first alarm message when the percentage is greater than or equal to the second ratio, wherein the first alarm message indicates a malfunction in the fuel cell, and the second ratio is greater than the first ratio; and a third control unit, configured to control the fuel cell to continue operating and issue a second alarm message when the percentage is greater than the first ratio but less than the second ratio, wherein the second alarm message indicates a decrease in the voltage of some of the battery cells. In this embodiment, by determining the percentage of cell voltage change rates exceeding a voltage change rate threshold, a large percentage indicates a fuel cell malfunction. At this time, issuing a first alarm message alerts relevant personnel to stop the fuel cell for inspection and troubleshooting, thus preventing continued operation of the fuel cell in a malfunctioning state from reducing its lifespan. When the percentage is greater than the first ratio but less than the second ratio, it indicates that only some battery cells have an increased voltage change rate. In this case, the fuel cell can continue operating, and issuing a second alarm message alerts relevant personnel to the decrease in the voltage of some battery cells, allowing them to simultaneously investigate the cause. This further ensures the safety and durability of the fuel cell without delaying its normal operation.

[0102] In one alternative, the first ratio can be 10%, and the second ratio can be 80%.

[0103] Furthermore, the aforementioned device of this application further includes: an issuing unit, configured to issue a third alarm message when the aforementioned proportion is less than or equal to the aforementioned first proportion, the aforementioned ion concentration change rate is greater than the aforementioned ion concentration change rate threshold, and the aforementioned inlet / outlet pressure drop is less than or equal to the aforementioned pressure drop threshold. The third alarm message is information characterizing the ion deposition rate of the pipeline connected to the coolant chamber. When the aforementioned conditions occur, it indicates a potential problem with the ion deposition capacity of the coolant chamber pipeline. Issuing the third alarm message prompts relevant personnel to investigate the ion deposition rate of the coolant chamber pipeline, enabling timely detection of faults and further ensuring the safe operation of the fuel cell and improving its durability.

[0104] To further avoid false alarms that may be caused by fixed thresholds, the first relationship mentioned above includes the historical threshold corresponding to the hydrogen concentration and the historical operating temperature. The first correction module includes: a seventh determining submodule, used to determine a temperature correction coefficient as the ratio of the current operating temperature to the historical operating temperature based on the current operating temperature and the historical operating temperature; and an eighth determining submodule, used to determine the first information as the product of the temperature correction coefficient and the parameter threshold corresponding to the hydrogen concentration based on the temperature correction coefficient. In the above embodiment, correcting the parameter threshold corresponding to the hydrogen concentration based on the operating temperature further avoids the problem of false alarms.

[0105] Of course, in addition to the methods described above, the first relationship includes the historical threshold and historical operating temperature corresponding to the hydrogen concentration. The first correction module includes: a ninth determining submodule, used to determine a temperature correction coefficient as the ratio of the current operating temperature to the historical operating temperature based on the current operating temperature and the historical operating temperature; and a tenth determining submodule, used to determine the first information as the product of the temperature correction coefficient and the hydrogen concentration based on the temperature correction coefficient. In the above embodiments, correcting the hydrogen concentration based on the operating temperature further avoids false alarms.

[0106] To further avoid false alarms that may be caused by fixed thresholds, the second relationship mentioned above further includes the historical thresholds and historical operating currents corresponding to the remaining operating parameters. The second correction module includes: an eleventh determining submodule, used to determine the current correction coefficient as the ratio of the current operating current to the historical operating current based on the current operating current and the historical operating current; and a twelfth determining submodule, used to determine the third information as the product of the current correction coefficient and the parameter thresholds corresponding to the remaining operating parameters based on the current correction coefficient.

[0107] Of course, in addition to the above methods, the second relationship also includes the remaining operating parameters and historical operating current. The second correction module includes: a thirteenth determining submodule, used to determine the current correction coefficient as the ratio of the current operating current to the historical operating current based on the current operating current and the historical operating current; and a fourteenth determining submodule, used to determine the third information as the product of the current correction coefficient and the parameter threshold corresponding to the remaining operating parameters based on the current correction coefficient.

[0108] The aforementioned fuel cell leak diagnosis device includes a processor and a memory. The acquisition unit, determination unit, etc., are all stored as program units in the memory, and the processor executes these program units to achieve the corresponding functions. All of the above modules are located in the same processor; alternatively, the modules may be located in different processors in any combination.

[0109] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and by adjusting kernel parameters, at least the problem of poor safety caused by the inability to monitor for leaks between the hydrogen chamber and coolant chamber of the fuel cell during operation can be addressed.

[0110] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0111] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the fuel cell leak diagnosis method.

[0112] Specifically, methods for diagnosing leaks in fuel cells include:

[0113] Step S201: Obtain the actual operating parameters of the fuel cell during operation. The actual operating parameters include the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration of the coolant chamber, the rate of change of ion concentration in the coolant chamber within a predetermined time period, and the rate of change of voltage of each of the aforementioned battery cells within the predetermined time period.

[0114] Specifically, an inlet pressure sensor is installed at the hydrogen chamber inlet, and an outlet pressure sensor is installed at the hydrogen chamber outlet. The inlet pressure sensor collects the inlet pressure of the hydrogen chamber, and the outlet pressure sensor collects the outlet pressure of the hydrogen chamber. The inlet-outlet pressure drop is calculated as the difference between the inlet pressure and the outlet pressure. The coolant chamber is equipped with a hydrogen concentration sensor and an ion concentration sensor. The hydrogen concentration sensor collects the hydrogen concentration in the coolant chamber, and the ion concentration sensor collects the ion concentration in the coolant chamber at various times. Based on the obtained ion concentrations at multiple times, the ion concentration change rate within the predetermined time period is calculated. The individual cell voltage is collected at various times using a single-cell voltage acquisition structure, and based on the obtained individual cell voltages at multiple times for each individual cell, the voltage change rate within the predetermined time period is calculated.

[0115] Step S202: Based on the actual operating parameters and corresponding parameter thresholds, determine whether a leak has occurred between the hydrogen chamber and the coolant chamber.

[0116] Specifically, the aforementioned parameter thresholds include the threshold for the inlet / outlet pressure drop, the threshold for the hydrogen concentration, the threshold for the rate of change of the ion concentration, and the threshold for the rate of change of the voltage.

[0117] Optionally, determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the actual operating parameters and corresponding parameter thresholds includes: obtaining a first relationship between the hydrogen concentration of the fuel cell and one of the corresponding parameter thresholds and the operating temperature of the fuel cell; obtaining a second relationship between the remaining operating parameters of the fuel cell and one of the corresponding parameter thresholds and the operating current of the fuel cell, wherein the remaining operating parameters are the actual operating parameters excluding the hydrogen concentration; correcting the hydrogen concentration and one of the corresponding parameter thresholds based on the current operating temperature of the fuel cell and the first relationship to obtain first information, wherein the other of the hydrogen concentration and the corresponding parameter thresholds is second information; correcting the remaining operating parameters and one of the corresponding parameter thresholds based on the current operating current of the fuel cell and the second relationship to obtain third information, wherein the other of the remaining operating parameters and the corresponding parameter thresholds is fourth information; and determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the first information, the second information, the third information, and the fourth information.

[0118] Optionally, the first information includes a hydrogen concentration threshold, and the third information includes an ion concentration change rate threshold, a pressure drop threshold, and a voltage change rate threshold. Determining whether a leak occurs between the hydrogen chamber and the coolant chamber based on the first, second, third, and fourth information includes: if the hydrogen concentration is greater than the hydrogen concentration threshold, determining that the hydrogen concentration in the coolant chamber exceeds the limit; and calculating the proportion of voltage change rates exceeding the voltage change rate threshold based on multiple voltage change rates and the voltage change rate threshold; determining whether the proportion is less than or equal to a first ratio, whether the ion concentration change rate is greater than the ion concentration change rate threshold, and whether the inlet / outlet pressure drop is greater than the pressure drop threshold; and determining that a leak occurs between the hydrogen chamber and the coolant chamber if the proportion is less than and equal to the first ratio, the ion concentration change rate is greater than the ion concentration change rate threshold, and the inlet / outlet pressure drop is greater than the pressure drop threshold.

[0119] Optionally, the method further includes: when the proportion is greater than or equal to the second proportion, controlling the fuel cell to stop operating and issuing a first alarm message, the first alarm message being information indicating that the fuel cell has malfunctioned, and the second proportion being greater than the first proportion; when the proportion is greater than the first proportion and less than the second proportion, controlling the fuel cell to continue operating and issuing a second alarm message, the second alarm message being information indicating that the cell voltage of some of the battery cells has decreased.

[0120] Optionally, the above method further includes: issuing a third alarm message when the above proportion is less than or equal to the above first proportion, the above ion concentration change rate is greater than the above ion concentration change rate threshold, and the above inlet / outlet pressure drop is less than or equal to the above pressure drop threshold, wherein the third alarm message is information characterizing the detection of the ion precipitation rate of the pipeline connected to the above coolant chamber.

[0121] Optionally, the first relationship includes the historical threshold and historical operating temperature corresponding to the hydrogen concentration. Based on the current operating temperature of the fuel cell and the first relationship, the hydrogen concentration and one of the corresponding parameter thresholds are corrected to obtain first information, including: determining a temperature correction coefficient as the ratio of the current operating temperature to the historical operating temperature based on the current operating temperature and the historical operating temperature; and determining the first information as the product of the temperature correction coefficient and the parameter threshold corresponding to the hydrogen concentration based on the temperature correction coefficient. The second relationship includes the historical threshold and historical operating current corresponding to the remaining operating parameters. Based on the current operating current of the fuel cell and the second relationship, the remaining operating parameters and one of the corresponding parameter thresholds are corrected to obtain third information, including: determining a current correction coefficient as the ratio of the current operating current to the historical operating current based on the current operating current and the historical operating current; and determining the third information as the product of the current correction coefficient and the parameter threshold corresponding to the remaining operating parameters based on the current correction coefficient.

[0122] This invention provides a processor for running a program, wherein the program executes the fuel cell leak diagnosis method.

[0123] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it at least implements the aforementioned fuel cell leak diagnosis method. The device described herein can be a server, PC, PAD, mobile phone, etc.

[0124] This application also provides a computer program product, including computer instructions, which, when executed by a processor, at least implement the aforementioned fuel cell leakage diagnosis method.

[0125] Embodiments of this application also provide a fuel cell engine, comprising: a fuel cell including a plurality of battery cells connected in series; one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include methods for performing any of the methods described above.

[0126] In the aforementioned fuel cell engine, by comparing the actual operating parameters such as the pressure drop at the inlet and outlet of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber, and the voltage change rate of each cell during fuel cell operation with the corresponding parameter thresholds, it is possible to determine whether leakage occurs between the hydrogen chamber and the coolant chamber. This enables monitoring of whether leakage occurs between the hydrogen chamber and the coolant chamber of the fuel cell during operation, ensuring high safety and good product durability of the fuel cell engine during operation.

[0127] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0128] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0129] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0130] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0131] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0132] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0133] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0134] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0135] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0136] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0137] The fuel cell leakage diagnosis method of this application first acquires actual operating parameters during fuel cell operation, including the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber within a predetermined time period, and the voltage change rate of each cell within a predetermined time period. Then, based on the acquired actual operating parameters and corresponding parameter thresholds, it determines whether leakage has occurred between the hydrogen chamber and the coolant chamber. Compared to existing technologies that only test the airtightness of the hydrogen chamber-coolant chamber after engine assembly, failing to monitor for leaks during operation and resulting in poor fuel cell safety, this application determines whether leakage has occurred between the hydrogen chamber and the coolant chamber by comparing the actual operating parameters—the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration and ion concentration change rate of the coolant chamber, and the voltage change rate of each cell—with their corresponding parameter thresholds during fuel cell operation. This achieves monitoring of whether leakage occurs between the hydrogen chamber and the coolant chamber during fuel cell operation, ensuring high fuel cell safety during operation.

[0138] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for diagnosing leaks in a fuel cell, the fuel cell comprising multiple cells connected in series, characterized in that, The method includes: The actual operating parameters of the fuel cell during operation are obtained, including the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration of the coolant chamber, the rate of change of ion concentration in the coolant chamber within a predetermined time period, and the rate of change of voltage of each cell within the predetermined time period. Based on the actual operating parameters and the corresponding parameter thresholds, determine whether a leak has occurred between the hydrogen chamber and the coolant chamber; Determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the actual operating parameters and corresponding parameter thresholds includes: obtaining a first relationship between the hydrogen concentration of the fuel cell and one of the corresponding parameter thresholds and the operating temperature of the fuel cell; obtaining a second relationship between the remaining operating parameters of the fuel cell and one of the corresponding parameter thresholds and the operating current of the fuel cell, wherein the remaining operating parameters are the actual operating parameters excluding the hydrogen concentration; correcting one of the hydrogen concentration and the corresponding parameter thresholds based on the current operating temperature of the fuel cell and the first relationship to obtain first information, wherein the other of the hydrogen concentration and the corresponding parameter thresholds is second information; correcting one of the remaining operating parameters and the corresponding parameter thresholds based on the current operating current of the fuel cell and the second relationship to obtain third information, wherein the other of the remaining operating parameters and the corresponding parameter thresholds is fourth information; and determining whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the first information, the second information, the third information, and the fourth information. The first information includes a hydrogen concentration threshold, and the third information includes an ion concentration change rate threshold, a pressure drop threshold, and a voltage change rate threshold. Based on the first, second, third, and fourth information, determining whether a leak has occurred between the hydrogen chamber and the coolant chamber includes: if the hydrogen concentration is greater than the hydrogen concentration threshold, determining that the hydrogen concentration in the coolant chamber exceeds the limit; and calculating the percentage of voltage change rates exceeding the voltage change rate threshold based on multiple voltage change rates and the voltage change rate threshold; determining whether the percentage is less than or equal to a first proportion, whether the ion concentration change rate is greater than the ion concentration change rate threshold, and whether the inlet / outlet pressure drop is greater than the pressure drop threshold, wherein the first proportion is 10%; and determining that a leak has occurred between the hydrogen chamber and the coolant chamber if the percentage is less than and equal to the first proportion, the ion concentration change rate is greater than the ion concentration change rate threshold, and the inlet / outlet pressure drop is greater than the pressure drop threshold. The first relationship includes the historical threshold corresponding to the hydrogen concentration and the historical operating temperature. Based on the current operating temperature of the fuel cell and the first relationship, one of the hydrogen concentration and the corresponding parameter threshold is corrected to obtain first information, including: determining a temperature correction coefficient as the ratio of the current operating temperature to the historical operating temperature based on the current operating temperature and the historical operating temperature; and determining the first information as the product of the temperature correction coefficient and the parameter threshold corresponding to the hydrogen concentration based on the temperature correction coefficient. The second relationship includes the historical threshold corresponding to the remaining operating parameters and the historical operating current. Based on the current operating current of the fuel cell and the second relationship, one of the remaining operating parameters and the corresponding parameter threshold is corrected to obtain third information, including: determining a current correction coefficient as the ratio of the current operating current to the historical operating current based on the current operating current and the historical operating current; and determining the third information as the product of the current correction coefficient and the parameter threshold corresponding to the remaining operating parameters based on the current correction coefficient.

2. The method according to claim 1, characterized in that, The method further includes: When the percentage is greater than or equal to the second percentage, the fuel cell is controlled to stop operating and a first alarm message is issued. The first alarm message is information indicating that the fuel cell has malfunctioned. The second percentage is 80%. If the proportion is greater than the first proportion and less than the second proportion, the fuel cell is controlled to continue operating and a second alarm message is issued, which is information indicating that the voltage of some of the battery cells has decreased.

3. The method according to claim 1, characterized in that, The method further includes: If the percentage is less than or equal to the first percentage, the ion concentration change rate is greater than the ion concentration change rate threshold, and the inlet / outlet pressure drop is less than or equal to the pressure drop threshold, a third alarm message is issued. The third alarm message is information characterizing the detection of the ion precipitation rate of the pipeline connected to the coolant chamber.

4. A leak diagnosis device for a fuel cell, said fuel cell comprising a plurality of cells connected in series, characterized in that, The fuel cell leak diagnosis device performs the method according to any one of claims 1 to 3, the device comprising: The acquisition unit is used to acquire the actual operating parameters of the fuel cell during operation. The actual operating parameters include the inlet and outlet pressure drop of the hydrogen chamber, the hydrogen concentration of the coolant chamber, the rate of change of ion concentration in the coolant chamber within a predetermined time period, and the rate of change of voltage of each cell within the predetermined time period. The determining unit is used to determine whether a leak has occurred between the hydrogen chamber and the coolant chamber based on the actual operating parameters and the corresponding parameter thresholds.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 3.

6. A computer program product comprising computer instructions, characterized in that, When the computer instructions are executed by the processor, they implement the method described in any one of claims 1 to 3.

7. A fuel cell engine, characterized in that, include: A fuel cell consists of multiple cells connected in series; One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising methods for performing any one of claims 1 to 3.

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