Fuel cell system and method for operating evaluation, evaluation device, storage medium

Abstract

The application discloses a fuel cell system and an operation evaluation method, an evaluation device and a storage medium thereof, wherein the operation evaluation method of the fuel cell system comprises the following steps: determining a judgment power value of the fuel cell system; obtaining a current stack average single cell voltage of the fuel cell system when the fuel cell system outputs at the judgment power value; determining a voltage difference value between the current stack average single cell voltage and a last obtained stack average single cell voltage; and when the voltage difference value is less than a first preset voltage threshold, evaluating the operation condition of the fuel cell system according to the current stack average single cell voltage, so as to solve the problem that the fuel cell system life is not accurately evaluated by directly monitoring the stack voltage, improve the accuracy of the operation evaluation of the fuel cell system, and enable the user to timely adjust the use mode of the fuel cell according to the operation evaluation condition of the fuel cell system, thereby prolonging the service life of the fuel cell system and improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of fuel cell system technology, and in particular to a method for evaluating the operation of a fuel cell system, a computer-readable storage medium, a fuel cell system, and an apparatus for evaluating the operation of a fuel cell system. Background Technology

[0002] Fuel cell systems are devices that generate electricity through an electrochemical reaction between air and hydrogen. Due to their high efficiency and pollution-free characteristics, they represent one of the important development directions for future new energy vehicle engines. Currently, in practical applications, the lifespan of fuel cell systems typically reaches 5,000-10,000 hours, with the main failure component being the fuel cell stack. Therefore, stack lifespan is generally considered the core evaluation metric for fuel cell system lifespan. In other words, stack lifespan can be used as the core evaluation metric for the operational assessment of a fuel cell system.

[0003] In related technologies, when evaluating the operation of a fuel cell system, the voltage of each cell in the stack is typically monitored online. When the stack voltage drops, it is determined that the stack's lifespan is nearing its end. However, when the stack fails to meet operational requirements at a certain time, or when a fault occurs in the fuel cell system, the stack voltage will also drop, leading to misjudgments and affecting the accuracy of the fuel cell system's operational evaluation. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, the first objective of this invention is to propose an operational evaluation method for a fuel cell system. By evaluating the operational status of the fuel cell system based on the current average single-cell voltage of the fuel cell stack when the system is outputting a determined power value, this method solves the problem of inaccurate assessment of fuel cell system lifespan by directly monitoring the stack voltage. This improves the accuracy of the operational evaluation, allowing users to adjust the fuel cell usage in a timely manner based on the operational evaluation status, extending the lifespan of the fuel cell system and enhancing the user experience.

[0005] A second objective of this invention is to provide a computer-readable storage medium.

[0006] The third objective of this invention is to provide a fuel cell system.

[0007] The fourth objective of this invention is to provide an operational evaluation device for a fuel cell system.

[0008] To achieve the above objectives, a first aspect of the present invention provides a method for evaluating the operation of a fuel cell system. The method includes: determining a judgment power value of the fuel cell system; acquiring the current average single-cell voltage of the fuel cell stack when the fuel cell system outputs at the judgment power value; determining the voltage difference between the current average single-cell voltage of the fuel cell stack and the previously acquired average single-cell voltage of the fuel cell stack; and evaluating the operation of the fuel cell system based on the current average single-cell voltage of the fuel cell stack when the voltage difference is less than a first preset voltage threshold.

[0009] The fuel cell system operation evaluation method according to embodiments of the present invention determines the judgment power value of the fuel cell system, and when the fuel cell system outputs at the judgment power value, obtains the current average single cell voltage of the fuel cell stack, and when the voltage difference between the current average single cell voltage and the previously obtained average single cell voltage is less than a first preset voltage threshold, evaluates the operation of the fuel cell system based on the current average single cell voltage. This solves the problem of inaccurate evaluation of fuel cell system lifespan by directly monitoring the stack voltage, improves the accuracy of fuel cell system operation evaluation, enables users to adjust the use of the fuel cell in a timely manner based on the operation evaluation status of the fuel cell system, extends the service life of the fuel cell system, and improves the user experience.

[0010] In addition, the fuel cell system operation evaluation method according to the above embodiments of the present invention may also have the following additional features:

[0011] According to one embodiment of the present invention, obtaining the current average single cell voltage of a fuel cell system stack includes: determining the voltage of each single cell and calculating a first average voltage value based on the voltage of each single cell; obtaining multiple first average voltage values ​​within a preset time period; and performing an average calculation on the multiple first average voltage values ​​within the preset time period to obtain the current average single cell voltage of the fuel cell stack.

[0012] According to one embodiment of the present invention, when obtaining the current average single cell voltage of the fuel cell stack, the operation evaluation method of the fuel cell system further includes: determining whether there is a fault in the fuel cell system;

[0013] If yes, discard the current average cell voltage of the fuel cell stack; otherwise, store the current average cell voltage of the fuel cell stack.

[0014] According to one embodiment of the present invention, after determining the voltage difference between the current average single cell voltage of the fuel cell stack and the previously obtained average single cell voltage of the fuel cell stack, the operation evaluation method of the fuel cell system further includes: discarding the current average single cell voltage of the fuel cell stack when the voltage difference is greater than or equal to a first preset voltage threshold.

[0015] According to one embodiment of the present invention, the operation of the fuel cell system is evaluated based on the current average single cell voltage of the fuel cell stack, including: when the current average single cell voltage of the fuel cell stack is less than or equal to a second preset voltage threshold, obtaining the actual working time of the fuel cell system, and determining whether the actual working time of the fuel cell system is less than a preset test time; if so, determining that the operating condition of the fuel cell system is poor, and issuing a prompt message to optimize the operating condition; if not, determining that the operating condition of the fuel cell system is normal.

[0016] According to one embodiment of the present invention, the evaluation of the operating status of the fuel cell system based on the current average single cell voltage of the fuel cell stack further includes: when the current average single cell voltage of the fuel cell stack is greater than a third preset voltage threshold and less than a fourth preset voltage threshold, determining that the service life of the fuel cell system has reached a warning limit value, and issuing a spare parts warning message, wherein the fourth preset voltage threshold is less than a second preset voltage threshold.

[0017] According to one embodiment of the present invention, the operation of the fuel cell system is evaluated based on the current average single cell voltage of the fuel cell stack, and the evaluation further includes: when the current average single cell voltage of the fuel cell stack is less than or equal to a third preset voltage threshold, determining that the service life of the fuel cell system has reached a warning limit value, and issuing a replacement warning message.

[0018] To achieve the above objectives, a second aspect of the present invention provides a computer-readable storage medium storing an operation evaluation program for a fuel cell system. When the operation evaluation program for the fuel cell system is executed by a processor, the operation evaluation method for the fuel cell system described in the above embodiments is implemented.

[0019] According to the computer-readable storage medium of the present invention, when the stored fuel cell system operation evaluation program is executed by a processor, the above-described fuel cell system operation evaluation method is executed, which solves the problem of inaccurate evaluation of fuel cell system life by directly monitoring the battery stack voltage, improves the accuracy of fuel cell system operation evaluation, enables users to adjust the use of fuel cells in a timely manner according to the operation evaluation status of the fuel cell system, extends the service life of the fuel cell system, and improves the user experience.

[0020] To achieve the above objectives, a third aspect of the present invention provides a fuel cell system, which includes a memory, a processor, and a fuel cell system operation evaluation program stored in the memory and executable on the processor. When the processor executes the fuel cell system operation evaluation program, it implements the fuel cell system operation evaluation method described in the above embodiments.

[0021] According to the fuel cell system of the present invention, when the fuel cell system operation evaluation program stored in the memory is executed by the processor, the above-described fuel cell system operation evaluation method is executed, which solves the problem of inaccurate evaluation of fuel cell system life by directly monitoring the battery stack voltage, improves the accuracy of fuel cell system operation evaluation, enables users to adjust the use of fuel cells in a timely manner according to the operation evaluation status of fuel cell system, extends the service life of fuel cell system, and improves user experience.

[0022] To achieve the above objectives, a fourth aspect of the present invention provides an operation evaluation device for a fuel cell system. The operation evaluation device includes: a first determining module for determining a judgment power value of the fuel cell system; an acquiring module for acquiring the current average single-cell voltage of the fuel cell stack when the fuel cell system outputs at the judgment power value; a second determining module for determining the voltage difference between the current average single-cell voltage of the fuel cell stack and the previously acquired average single-cell voltage of the fuel cell stack; and an evaluation module for evaluating the operation of the fuel cell system based on the current average single-cell voltage of the fuel cell stack when the voltage difference is less than a first preset voltage threshold.

[0023] According to an embodiment of the present invention, the fuel cell system operation evaluation device determines the judgment power value of the fuel cell system through a first determining module, and the acquisition module acquires the current average single cell voltage of the fuel cell stack when the fuel cell system outputs at the judgment power value. The second determining module determines the voltage difference between the current average single cell voltage and the previously acquired average single cell voltage, and the evaluation module assesses that when the voltage difference is less than a first preset voltage threshold, the operation status of the fuel cell system is evaluated based on the current average single cell voltage. This solves the problem of inaccurate evaluation of fuel cell system life by directly monitoring the stack voltage, improves the accuracy of fuel cell system operation evaluation, allows users to adjust the use of the fuel cell in a timely manner according to the operation evaluation status of the fuel cell system, extends the service life of the fuel cell system, and improves the user experience.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 A flowchart of an operation evaluation method for a fuel cell system according to an embodiment of the present invention;

[0026] Figure 2 A flowchart of an operation evaluation method for a fuel cell system according to a specific embodiment of the present invention;

[0027] Figure 3 This is a block diagram of a fuel cell system according to an embodiment of the present invention;

[0028] Figure 4 This is a block diagram of an operation evaluation device for a fuel cell system according to an embodiment of the present invention. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] First, this application is based on the inventor's understanding and research on the following issues:

[0031] The fuel cell stack, a crucial component of a fuel cell system, is typically composed of multiple individual cells connected in series. As the stack's operating time increases, the performance of each individual cell, such as catalyst activity and proton permeability of the proton exchange membrane, declines. Towards the end of the stack's lifespan, while maintaining the same power output from the fuel cell system, the voltage drop of each individual cell is significantly lower than its initial voltage, and the stack's maximum output power will decrease markedly.

[0032] In related technologies, the main evaluation indicator for the end of a fuel cell system's lifespan is generally considered to be a single cell voltage falling below 10%-20% of its initial voltage. Therefore, this main evaluation criterion can be used to conduct offline durability tests on the fuel cell system. However, in actual use, users cannot conduct offline durability tests on the fuel cell system based on this main evaluation criterion; instead, they primarily evaluate the fuel cell system's operation based on the stack's maximum output power or the vehicle's power performance.

[0033] Furthermore, because the lifespan of a fuel cell system is greatly affected by operating conditions, such as ambient temperature, pressure, number of start-ups and shutdowns, and whether the driving is aggressive, the lifespan simulated or tested before the fuel cell system leaves the factory may differ significantly from the actual lifespan. This cannot effectively assess the operating status of the fuel cell system, guide users to take corresponding measures, thereby affecting vehicle performance, causing operational difficulties, and even posing safety risks.

[0034] Therefore, in order to solve the problem of the inability to accurately assess the lifespan of a fuel cell system, this application proposes a method for evaluating the operation of a fuel cell system. By evaluating the operation of the fuel cell system based on the current average single-cell voltage of the stack when the fuel cell system outputs a judgment power value, the accuracy of the operation evaluation of the fuel cell system can be improved.

[0035] The following description, with reference to the accompanying drawings, illustrates the fuel cell system operation evaluation method, the fuel cell system having the operation evaluation method, and the fuel cell system operation evaluation device according to embodiments of the present invention.

[0036] Figure 1 This is a flowchart illustrating an operational evaluation method for a fuel cell system according to an embodiment of the present invention. (Reference) Figure 1 As shown, the operational evaluation method for this fuel cell system includes the following steps:

[0037] Step S1: Determine the judgment power value of the fuel cell system.

[0038] Specifically, the power value can be determined based on the commonly used power value determined by the idling power of the fuel cell system.

[0039] For example, the idle power of a 110kW fuel cell system is 15kW. During startup, the output power of the fuel cell system must increase from the idle power, and the output power generally increases from low to high. Furthermore, the control strategy of the fuel cell system will control the output power to be slightly higher than the idle power. Therefore, the judgment power value of the fuel cell system is determined to be 30kW.

[0040] Step S2: When the fuel cell system outputs the determined power value, obtain the current average single cell voltage of the fuel cell stack.

[0041] Specifically, when the fuel cell system outputs a power value, the average voltage of each battery pack is acquired within a preset time period, and the average single cell voltage of the current fuel cell stack is obtained based on the average voltage of each single cell, and the average voltage of the current fuel cell stack is stored.

[0042] For example, within a preset time period (e.g., 10 seconds), the average voltage Vn1 of cell #1, the voltage Vn2 of cell #2, ..., the average voltage VnN of cell #N can be obtained, and the current average cell voltage of the fuel cell stack can be obtained based on the average voltage of each cell.

[0043] Optionally, in some embodiments of the present invention, obtaining the current average single-cell voltage of the fuel cell stack includes: determining the voltage of each single cell and calculating a first average voltage value based on the voltage of each single cell; obtaining multiple first average voltage values ​​within a preset time period; and performing an average calculation on the multiple first average voltage values ​​within the preset time period to obtain the current average single-cell voltage of the fuel cell stack.

[0044] Specifically, the sum of the voltages of the individual cells is calculated based on the voltage of each individual cell, and a first average voltage value is calculated based on the sum of the voltages of the individual cells to eliminate the problem of different working voltages caused by different working conditions among the individual cells of the stack. Then, multiple first average voltage values ​​within a preset time period are obtained, and the average of the multiple first average voltage values ​​within the preset time period is calculated to obtain the current average single cell voltage of the stack.

[0045] For example, within a preset time interval (e.g., 1 second), the voltage V1 of cell #1, the voltage V2 of cell #2, ..., the voltage VN of cell #N can be determined. Then, based on the sum of the cell voltages Vm = V1 + V2 + ... + VN, a first average voltage value Vm1 = Vm / N can be calculated. The average of multiple first average voltage values ​​(e.g., 10 values) within a preset time period (e.g., 10 seconds) is calculated to obtain the current average cell voltage of the fuel cell stack.

[0046] It should be noted that by obtaining the current average single-cell voltage of the fuel cell stack, the problem of inaccurate current stack voltage of the fuel cell system caused by abnormal voltage conditions (such as instantaneous voltage jumps when the voltage detector detects the voltage of the fuel cell system, voltage fluctuations caused by the instantaneous unstable operation of the BOP (Balance of Plant, auxiliary equipment), and voltage overshoot during load changes) can be eliminated, thereby improving the accuracy of the operation evaluation of the fuel cell system.

[0047] Step S3: Determine the voltage difference between the current average single cell voltage of the fuel cell stack and the previously obtained average single cell voltage of the fuel cell stack.

[0048] It should be noted that the method used to obtain the average single-cell voltage of the fuel cell stack in the previous instance is the same as the method used for the current average single-cell voltage of the fuel cell stack, and will not be repeated here.

[0049] Step S4: When the voltage difference is less than the first preset voltage threshold, the operating status of the fuel cell system is evaluated based on the current average single cell voltage of the fuel cell stack.

[0050] Specifically, when the voltage difference is less than a first preset voltage threshold, the operating status of the fuel cell system is determined based on the relationship between the current average single-cell voltage of the fuel cell stack and the corresponding preset voltage threshold, as well as the relationship between the actual operating time of the current average single-cell voltage of the fuel cell stack and the preset test time. The first preset voltage threshold can be set according to the actual situation of the fuel cell system, for example, 0.01V.

[0051] Furthermore, in some embodiments of the present invention, the operation of the fuel cell system is evaluated based on the current average single-cell voltage of the fuel cell stack, including: when the current average single-cell voltage of the fuel cell stack is less than or equal to a second preset voltage threshold, obtaining the actual working time of the fuel cell system, and determining whether the actual working time of the fuel cell system is less than a preset test time; if so, it is determined that the operating condition of the fuel cell system is poor, and a prompt message for optimizing the operating condition is issued; if not, it is determined that the operating condition of the fuel cell system is normal.

[0052] Understandably, as the actual operating time of the fuel cell system increases, the average single-cell voltage of the current stack gradually decreases. When the average single-cell voltage of the current stack is less than or equal to a second preset voltage threshold (e.g., 0.76V), the actual operating time of the fuel cell system (calculated from the first time the fuel cell system is put into use) is acquired, and it is determined whether the actual operating time of the fuel cell system is less than the preset test time (which can be determined through offline durability testing). If so, the operating condition of the fuel cell system is determined to be poor, and a prompt message to optimize the operating condition is issued; if not, the operating condition of the fuel cell system is determined to be normal.

[0053] In other words, by comparing the actual time the fuel cell stack is depleted (actual operating time) with the tested time depleted (preset test time), if the actual time depleted is less than the tested time, it is determined that the fuel cell system is operating under poor conditions and its lifespan is shorter than the tested lifespan, requiring a prompt to optimize operating conditions. If the actual time depleted is greater than or equal to the tested time, it is determined that the fuel cell system is operating normally and its lifespan is longer than the tested lifespan. Furthermore, if the vehicle testing backend determines, based on the actual operating times of multiple fuel cell systems, that the actual time depleted by the stacks of multiple fuel cell systems is greater than or equal to the tested time, it is determined that the second preset voltage threshold in the fuel cell system operation evaluation method is set too high and needs adjustment.

[0054] Therefore, it is possible not only to reasonably assess the operation of fuel cell systems, but also to adjust the control strategy of the fuel cell system operation assessment method based on comparisons, so as to improve the accuracy of fuel cell system operation assessment.

[0055] In some embodiments of the present invention, the evaluation of the operating status of the fuel cell system based on the current average single cell voltage of the fuel cell stack further includes: when the current average single cell voltage of the fuel cell stack is greater than a third preset voltage threshold and less than a fourth preset voltage threshold, determining that the service life of the fuel cell system has reached a warning limit value, and issuing a spare parts warning message, wherein the fourth preset voltage threshold is less than a second preset voltage threshold.

[0056] In some embodiments of the present invention, the evaluation of the operating status of the fuel cell system based on the current average single cell voltage of the fuel cell stack further includes: when the current average single cell voltage of the fuel cell stack is less than or equal to a third preset voltage threshold, determining that the service life of the fuel cell system has reached a warning limit value, and issuing a replacement warning message.

[0057] Specifically, when the average single cell voltage of the current fuel cell stack is greater than the third preset voltage threshold but less than the fourth preset voltage threshold, the service life of the fuel cell system is determined to have reached the warning limit value, and a spare parts reminder message is issued; when the average single cell voltage of the current fuel cell stack is less than or equal to the third preset voltage threshold, the service life of the fuel cell system is determined to have reached the warning limit value, and a replacement warning message is issued.

[0058] It should be noted that when the voltage of a single cell falls below 10% of its initial voltage, the lifespan of the fuel cell system is considered nearing its end. In other words, when the average voltage of a single cell in the current stack falls below 10% of its initial voltage, the lifespan of the fuel cell system is also considered nearing its end. Therefore, when the initial voltage of a single cell is 0.8V, the third preset voltage threshold is 0.72V, and the fourth preset voltage threshold is 0.74V.

[0059] Therefore, by issuing a spare parts reminder when the average single cell voltage of the current fuel cell stack is about to drop to the third preset voltage threshold, and issuing a replacement warning when the average single cell voltage of the current fuel cell stack is lower than the third preset voltage threshold, the user is informed of the lifespan of the fuel cell system, so that the user can replace the fuel cell system in a timely manner, thus improving the user experience.

[0060] In summary, in this embodiment of the invention, by determining the judgment power value of the fuel cell system, and when the fuel cell system outputs at the judgment power value, obtaining the current average single-cell voltage of the fuel cell stack, and when the voltage difference between the current average single-cell voltage and the previously obtained average single-cell voltage is less than a first preset voltage threshold, the operating status of the fuel cell system is evaluated based on the current average single-cell voltage. This solves the problem of inaccurate evaluation of fuel cell system lifespan by directly monitoring the stack voltage, improves the accuracy of fuel cell system operation evaluation, allows users to adjust the usage of the fuel cell in a timely manner based on the operation evaluation status of the fuel cell system, extends the service life of the fuel cell system, and enhances the user experience.

[0061] Optionally, in some embodiments of the present invention, when obtaining the current average single-cell voltage of the fuel cell stack, the method further includes: determining whether there is a fault in the fuel cell system; if so, discarding the current average single-cell voltage of the fuel cell stack; if not, storing the current average single-cell voltage of the fuel cell stack.

[0062] Specifically, when a fault occurs in the fuel cell system (a fault code is issued), to prevent misjudgment of the fuel cell system, the current average single cell voltage of the stack is discarded regardless of the fault level, and the current average single cell voltage of the stack is stored only after the fault in the fuel cell system is eliminated.

[0063] Optionally, in some embodiments of the present invention, after determining the voltage difference between the current average single cell voltage of the fuel cell stack and the previously obtained average single cell voltage of the fuel cell stack, the method further includes: discarding the current average single cell voltage of the fuel cell stack when the voltage difference is greater than or equal to a first preset voltage threshold.

[0064] Specifically, when calculating the current average single cell voltage of the fuel cell system, if the voltage difference between the current average single cell voltage and the previously acquired average single cell voltage is greater than or equal to a first preset voltage threshold (e.g., 0.01V), it can be determined that the fuel cell system as a whole has experienced an abnormal voltage drop. In this case, the current average single cell voltage is discarded. Furthermore, if the abnormality persists for more than 10 minutes, the fuel cell system reports this abnormality to the vehicle inspection backend so that staff can promptly inspect and repair the fuel cell system.

[0065] In summary, the fuel cell system operation evaluation method according to embodiments of the present invention determines the judgment power value of the fuel cell system. When the fuel cell system outputs at the judgment power value, it acquires the current average single-cell voltage of the fuel cell stack only when there is no fault in the fuel cell system and the voltage difference is greater than or equal to a first preset voltage threshold. Furthermore, when the voltage difference between the current average single-cell voltage and the previously acquired average single-cell voltage is less than the first preset voltage threshold, the operation of the fuel cell system is evaluated based on the current average single-cell voltage. This not only solves the problem of inaccurate evaluation of fuel cell system lifespan by directly monitoring the stack voltage, but also improves the accuracy of detecting the current average single-cell voltage of the fuel cell stack. This further improves the accuracy of fuel cell system operation evaluation, allowing users to adjust fuel cell usage methods promptly based on the fuel cell system's operation evaluation status, extending the fuel cell system's lifespan and enhancing the user experience.

[0066] refer to Figure 2 As shown, in a specific embodiment of the present invention, taking a 110kW fuel cell system with an initial single-cell voltage of 0.8V as an example, the operation evaluation method of the fuel cell system includes the following steps:

[0067] Step S201: The fuel cell system is started, and the judgment power value of the fuel cell system is determined to be 30 kW.

[0068] Step S202: When the fuel cell system outputs a determined power value, obtain the current average single cell voltage of the fuel cell stack.

[0069] Specifically, when the fuel cell system outputs 30kW and maintains it for 10s, the average single cell voltage of the stack is recorded within 10s, and the timing is restarted after 10s.

[0070] Step S203: During recording, determine whether there is a fault in the fuel cell system; if yes, proceed to step S210; if no, proceed to step S204.

[0071] Step S204: Store the current average single cell voltage of the fuel cell stack.

[0072] Step S205: Determine that the voltage difference between the current average single cell voltage of the fuel cell stack and the previously obtained average single cell voltage of the fuel cell stack is <0.01V. If yes, proceed to steps S204 and S206; otherwise, proceed to step S210.

[0073] Step S206: When the average single cell voltage of the current fuel cell stack is less than or equal to 0.76V, obtain the actual working time of the fuel cell system.

[0074] Step S207: Determine whether the actual working time of the fuel cell system is less than the preset test time. If so, determine that the operating conditions of the fuel cell system are poor and issue a prompt message to optimize the operating conditions; if not, determine that the operating conditions of the fuel cell system are normal.

[0075] In step S208, when the average single cell voltage of the current fuel cell stack is greater than 0.72V and less than 0.74V, it is determined that the service life of the fuel cell system has reached the warning limit value, and a spare parts reminder message is issued.

[0076] Step S209: When the average single cell voltage of the current stack is less than or equal to 0.72V, it is determined that the service life of the fuel cell system has reached the warning limit value, and a replacement warning message is issued.

[0077] Step S210: Discard the current average single cell voltage of the fuel cell stack.

[0078] In summary, the fuel cell system operation evaluation method according to embodiments of the present invention determines the judgment power value of the fuel cell system, obtains the current average single cell voltage of the fuel cell stack when the fuel cell system outputs at the judgment power value, and evaluates the operation of the fuel cell system based on the current average single cell voltage when the voltage difference between the current average single cell voltage and the previously obtained average single cell voltage is less than a first preset voltage threshold. This solves the problem of inaccurate evaluation of fuel cell system lifespan by directly monitoring the stack voltage, improves the accuracy of fuel cell system operation evaluation, enables users to adjust the usage of the fuel cell in a timely manner based on the operation evaluation status of the fuel cell system, extends the service life of the fuel cell system, and enhances the user experience.

[0079] Corresponding to the above embodiments, the present invention also proposes a computer-readable storage medium storing an operation evaluation program for a fuel cell system, which, when executed by a processor, implements the operation evaluation method for the fuel cell system described in the above embodiments.

[0080] According to the computer-readable storage medium of the present invention, when the stored fuel cell system operation evaluation program is executed by a processor, the above-described fuel cell system operation evaluation method is executed, which solves the problem of inaccurate evaluation of fuel cell system life by directly monitoring the battery stack voltage, improves the accuracy of fuel cell system operation evaluation, enables users to adjust the use of fuel cells in a timely manner according to the operation evaluation status of the fuel cell system, extends the service life of the fuel cell system, and improves the user experience.

[0081] Figure 3 This is a block diagram of a fuel cell system according to an embodiment of the present invention. (Reference) Figure 3 As shown, the fuel cell system 30 includes a memory 301, a processor 302, and a fuel cell system operation evaluation program stored in the memory and run on the processor. When the processor 302 executes the fuel cell system operation evaluation program, it implements the fuel cell system operation evaluation method described in the above embodiments.

[0082] According to the fuel cell system of the present invention, when the fuel cell system operation evaluation program stored in the memory is executed by the processor, the above-described fuel cell system operation evaluation method is executed, which solves the problem of inaccurate evaluation of fuel cell system life by directly monitoring the battery stack voltage, improves the accuracy of fuel cell system operation evaluation, enables users to adjust the use of fuel cells in a timely manner according to the operation evaluation status of fuel cell system, extends the service life of fuel cell system, and improves user experience.

[0083] Figure 4This is a block diagram of an operation evaluation apparatus for a fuel cell system according to an embodiment of the present invention. (Reference) Figure 4 As shown, the operation evaluation device 40 includes: a first determining module 401, used to determine the judgment power value of the fuel cell system; an acquisition module 402, used to acquire the current average single cell voltage of the fuel cell stack when the fuel cell system outputs at the judgment power value; a second determining module 403, used to determine the voltage difference between the current average single cell voltage of the fuel cell stack and the previously acquired average single cell voltage of the fuel cell stack; and an evaluation module 404, used to evaluate the operation of the fuel cell system based on the current average single cell voltage of the fuel cell stack when the voltage difference is less than a first preset voltage threshold.

[0084] According to one embodiment of the present invention, the acquisition module 402 is used to acquire the current average single cell voltage of the fuel cell stack, including: determining the voltage of each single cell and calculating a first average voltage value based on the voltage of each single cell; obtaining multiple first average voltage values ​​within a preset time period; and performing an average calculation on the multiple first average voltage values ​​within the preset time period to obtain the current average single cell voltage of the fuel cell stack.

[0085] According to one embodiment of the present invention, the acquisition module 402 is used to acquire the current average single cell voltage of the fuel cell system, and further includes: determining whether there is a fault in the fuel cell system; if so, discarding the current average single cell voltage of the fuel cell system; if not, storing the current average single cell voltage of the fuel cell system.

[0086] According to one embodiment of the present invention, the acquisition module 402 is configured to, after determining the voltage difference between the current average single cell voltage of the fuel cell stack and the previously acquired average single cell voltage of the fuel cell stack, further include: discarding the current average single cell voltage of the fuel cell stack when the voltage difference is greater than or equal to a first preset voltage threshold.

[0087] According to one embodiment of the present invention, the evaluation module 404 is used to evaluate the operating condition of the fuel cell system based on the current average single cell voltage of the fuel cell stack, including: when the current average single cell voltage of the fuel cell stack is less than or equal to a second preset voltage threshold, obtaining the actual operating time of the fuel cell system, and determining whether the actual operating time of the fuel cell system is less than a preset test time; if so, determining that the operating condition of the fuel cell system is poor, and issuing a prompt message to optimize the operating condition; if not, determining that the operating condition of the fuel cell system is normal.

[0088] According to one embodiment of the present invention, the evaluation module 404 is used to evaluate the operation of the fuel cell system based on the current average single cell voltage of the fuel cell stack, and further includes: when the current average single cell voltage of the fuel cell stack is greater than a third preset voltage threshold and less than a fourth preset voltage threshold, determining that the service life of the fuel cell system has reached a warning limit value, and issuing a spare parts warning message, wherein the fourth preset voltage threshold is less than a second preset voltage threshold.

[0089] According to one embodiment of the present invention, the evaluation module 404 is used to evaluate the operation of the fuel cell system based on the current average single cell voltage of the fuel cell stack, and further includes: when the current average single cell voltage of the fuel cell stack is less than or equal to a third preset voltage threshold, determining that the service life of the fuel cell system has reached a warning limit value, and issuing a replacement warning message.

[0090] It should be noted that the description of the operation evaluation device for the fuel cell system can be found in the aforementioned description of the operation evaluation method for the fuel cell system, and will not be elaborated here.

[0091] According to an embodiment of the present invention, the fuel cell system operation evaluation device determines the judgment power value of the fuel cell system through a first determining module, and the acquisition module acquires the current average single cell voltage of the fuel cell stack when the fuel cell system outputs at the judgment power value. The second determining module determines the voltage difference between the current average single cell voltage and the previously acquired average single cell voltage, and the evaluation module assesses that when the voltage difference is less than a first preset voltage threshold, the operation status of the fuel cell system is evaluated based on the current average single cell voltage. This solves the problem of inaccurate evaluation of fuel cell system life by directly monitoring the stack voltage, improves the accuracy of fuel cell system operation evaluation, allows users to adjust the use of the fuel cell in a timely manner according to the operation evaluation status of the fuel cell system, extends the service life of the fuel cell system, and improves the user experience.

[0092] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0093] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0094] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0096] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0097] In this invention, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific implementation.

[0098] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0099] It should be noted that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for evaluating the operation of a fuel cell system, characterized in that, include: Determine the judgment power value of the fuel cell system; When the fuel cell system outputs the determined power value, the current average single cell voltage of the fuel cell stack is obtained. Determine the voltage difference between the current average single cell voltage of the fuel cell stack and the previously acquired average single cell voltage of the fuel cell stack; When the voltage difference is less than a first preset voltage threshold, the operating status of the fuel cell system is evaluated based on the current average single cell voltage of the fuel cell stack. The operating status of the fuel cell system is evaluated based on the current average single-cell voltage of the fuel cell stack, including: When the average single cell voltage of the current fuel cell stack is less than or equal to a second preset voltage threshold, the actual working time of the fuel cell system is obtained, and it is determined whether the actual working time of the fuel cell system is less than a preset test time. If so, the operating conditions of the fuel cell system are determined to be poor, and a prompt message to optimize the operating conditions is issued. If not, then the fuel cell system is confirmed to be operating normally; Also includes: When the average single cell voltage of the current stack is greater than a third preset voltage threshold and less than a fourth preset voltage threshold, it is determined that the service life of the fuel cell system has reached a warning limit value, wherein the fourth preset voltage threshold is less than a second preset voltage threshold. When the average single cell voltage of the current fuel cell stack is less than or equal to the third preset voltage threshold, the lifespan of the fuel cell system is determined to have reached a warning limit.

2. The method for evaluating the operation of a fuel cell system according to claim 1, characterized in that, Obtaining the current average single-cell voltage of the fuel cell system stack includes: Determine the voltage of each individual cell, and calculate a first average voltage value based on the voltage of each individual cell; Obtain multiple first average voltage values ​​within a preset time period; The average value of multiple first average voltage values ​​within the preset time period is calculated to obtain the current average single cell voltage of the fuel cell stack.

3. The method for evaluating the operation of a fuel cell system according to claim 1 or 2, characterized in that, When obtaining the current average single-cell voltage of the fuel cell stack of the fuel cell system, the method further includes: Determine if the fuel cell system is faulty; If so, discard the current average single-cell voltage of the fuel cell stack; If not, store the current average single-cell voltage of the fuel cell stack.

4. The method for evaluating the operation of a fuel cell system according to claim 1 or 2, characterized in that, After determining the voltage difference between the current average cell voltage of the fuel cell stack and the previously acquired average cell voltage of the fuel cell stack, the method further includes: When the voltage difference is greater than or equal to a first preset voltage threshold, the current average single cell voltage of the fuel cell stack is discarded.

5. A computer-readable storage medium, characterized in that, It stores an operation evaluation program for a fuel cell system, which, when executed by a processor, implements the operation evaluation method for the fuel cell system as described in any one of claims 1-4.

6. A fuel cell system, characterized in that, The system includes a memory, a processor, and an operation evaluation program for a fuel cell system stored in the memory and running on the processor. When the processor executes the operation evaluation program for the fuel cell system, it implements the operation evaluation method for the fuel cell system according to any one of claims 1-4.

7. An operation evaluation device for a fuel cell system, characterized in that, The operation evaluation device is used to implement the operation evaluation method for the fuel cell system as described in any one of claims 1-4, and the operation evaluation device includes: The first determining module is used to determine the judgment power value of the fuel cell system; The acquisition module is used to acquire the current average single cell voltage of the fuel cell stack when the fuel cell system outputs the determined power value; The second determining module is used to determine the voltage difference between the current average single cell voltage of the fuel cell stack and the previously obtained average single cell voltage of the fuel cell stack. The evaluation module is used to evaluate the operation of the fuel cell system based on the current average single cell voltage of the fuel cell stack when the voltage difference is less than a first preset voltage threshold.

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