A method and device for extracting working conditions for fuel cell life evaluation

Abstract

The application discloses a working condition extraction method and device for fuel cell life evaluation, and the method comprises the following steps: determining the range of an idling interval, a large-load running interval and a small-load running interval under a durability test protocol to be extracted, and a large amplitude of variable load and a small amplitude of variable load; based on various parameters to be extracted, counting the start-stop times, idling time, large-load running time, small-load running time and variable load times in the durability test protocol, and calculating the time and times of each working condition to obtain a vehicle working condition spectrum of the durability test protocol. The application provides working condition spectrum data for a "working condition" test method of fuel cell life evaluation.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a method and apparatus for extracting operating conditions for fuel cell life assessment. Background Technology

[0002] Service life is one of the key bottlenecks restricting the commercialization of fuel cells. Rapid evaluation of fuel cell service life is beneficial to accelerating the advancement of fuel cell technology. One method proposes a "departmental operating condition" approach to evaluate fuel cell service life. By testing the voltage decay rate under typical operating conditions and statistically analyzing the duration or frequency of each typical operating condition during use, the service life of automotive fuel cells can be calculated. Another method for evaluating fuel cell durability using a "departmental operating condition" approach has been proposed and validated using experimental data and real-world vehicle road data. Furthermore, based on this "departmental operating condition" method, an online prediction method for the remaining life of fuel cells has been proposed. The Chinese National Standard GB / T 38914—2020, based on the "departmental operating condition" method, establishes a test and evaluation method for the service life of automotive proton exchange membrane fuel cell stacks, defining more detailed standards for voltage decay rate testing and service life calculation under various typical operating conditions.

[0003] However, at present, when evaluating the life of fuel cells based on the "different operating conditions" method, there is still no clear method for determining and extracting the operating condition spectrum, which needs to be further solved. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, the purpose of this invention is to provide operating condition spectrum data for the "operating condition" test method for fuel cell life evaluation, and to propose an operating condition extraction method for fuel cell life evaluation.

[0006] Another objective of this invention is to provide a condition extraction device for fuel cell life assessment.

[0007] To achieve the above objectives, this invention proposes a method for extracting operating conditions for fuel cell life assessment, comprising the following steps:

[0008] S1, determine the range of the idling range, high load operating range and low load operating range under the durability test protocol to be extracted, as well as the large load variation range and small load variation range;

[0009] S2, based on the various parameters to be extracted, the number of start-stop cycles, idling time, high-load operation time, low-load operation time and load variation cycles in the durability test protocol are statistically analyzed, and the time and number of cycles for each working condition are calculated to obtain the vehicle working condition spectrum of the durability test protocol.

[0010] The operating condition extraction method for fuel cell life assessment in this invention determines the range of the idling range, high-load operating range, and low-load operating range under the durability test protocol to be extracted, as well as the large and small load variation ranges. Based on the various parameters to be extracted, the number of start-stop cycles, idling time, high-load operating time, low-load operating time, and number of load variations in the durability test protocol are statistically analyzed, and the time and number of each operating condition are calculated to obtain the vehicle operating condition spectrum of the durability test protocol. This invention provides operating condition spectrum data for the "sub-operating condition" test method for fuel cell life assessment.

[0011] In addition, the operating condition extraction method for fuel cell life assessment according to the above embodiments of the present invention may also have the following additional technical features:

[0012] Furthermore, the number of start-stop cycles is defined as one start-stop cycle from the beginning to the end; the idling time is defined as the time occupied by the current value within the idling range below a% of the rated current starting from the start of the fuel cell; the low-load operating time is defined as the time occupied by the current value within the range from a% to b% of the rated current; the high-load operating time is defined as the time occupied by the current value within the range from b% of the rated current to the maximum current; the number of load changes is divided into large load changes and small load changes. Starting from the start of the fuel cell, the current value is read along the operating condition change process, and the point where the current is at its lowest is taken as the starting point of the load change operating condition. A load change is recorded when the current increase reaches [(maximum current - idle current) × c%], and a load reduction is recorded when the current decrease reaches [(maximum current - idle current) × c%]. The extreme low point marks the end of the current load change cycle and the beginning of the next load change cycle, which is the large load change. After the start of the load change condition, a load change is recorded when the current increase is between [(maximum value - minimum value) × d%] and [(maximum value - minimum value) × c%], and a load reduction is recorded when the current decrease reaches the same values. The extreme low point marks the end of the current load change cycle and the beginning of the next load change cycle, which is the small load change.

[0013] Furthermore, the idling time and the low-load operating time are each set as follows: a% is set to 5%-15%; b% is set to 50%-65%; c% is set to 50%-65%; and d% is set to 25%-40% for the large load change range and the small load change range.

[0014] Furthermore, the single cycle time of the durability test protocol or driving cycle is t′(s).

[0015] For the idling time t1, the idling time t1′(s) of the fuel cell within a single cycle is statistically analyzed to obtain the idling time per hour in the durability test protocol or driving cycle:

[0016]

[0017] Among them, the idling time t1′ of a single cycle starts from the start of the fuel cell and is the time occupied by the idling value in a single cycle;

[0018] For the high-load operating time t2, the high-load operating time t2′(s) of the fuel cell within a single cycle is statistically analyzed to obtain the hourly high-load operating time in the durability test protocol or driving cycle as follows:

[0019]

[0020] Among them, the high-load operation time t2′ of a single cycle starts from the start of the fuel cell and is the time occupied by the high-load operation interval within a single cycle;

[0021] For the low-load operating time t3, the low-load operating time t3′(s) of the fuel cell within a single cycle is statistically analyzed to obtain the hourly low-load operating time in the durability test protocol or driving cycle:

[0022]

[0023] Among them, the low-load operation time t3′ of a single cycle is the time occupied by the low-load operation interval within a single cycle, starting from the start of the fuel cell.

[0024] For the number of start-stop cycles p1, we define the period from fuel cell startup to shutdown as one start-stop cycle. We then count the number of start-stop cycles n1 within t′ to obtain the number of start-stop cycles per hour in the aforementioned durability test protocol or driving cycle:

[0025]

[0026] For the number of load changes p2, the corresponding number of load changes n2 of the fuel cell within a single cycle in the durability test protocol or driving cycle is counted to obtain the number of load changes per hour in the durability test protocol:

[0027]

[0028] Furthermore, the statistical number of load changes n2 includes: starting from the start of the fuel cell, reading the measured value along the working condition change process, taking the point where the measured value is at its lowest point as the starting point of the load change condition, until the increase in the measured value reaches the load change range, recording one load change, and then until the decrease in the measured value reaches the load change range, recording one load change cycle, and the point where the value reaches its lowest point is the end of the current load change cycle and the beginning of the next load change cycle.

[0029] To achieve the above objectives, another aspect of the present invention provides a working condition extraction device for fuel cell life assessment, comprising:

[0030] The determination module is used to determine the range of the idling range, high-load operating range, and low-load operating range under the durability test protocol to be extracted, as well as the large-scale load change range and the small-scale load change range.

[0031] The statistics module is used to statistically analyze the number of start-stop cycles, idling time, high-load operation time, low-load operation time, and load variation cycles in the durability test protocol based on various parameters to be extracted, and to calculate the time and number of cycles for each operating condition, thereby obtaining the automotive operating condition spectrum of the durability test protocol.

[0032] The operating condition extraction device for fuel cell life assessment in this invention determines the range of the idling range, high-load operating range, and low-load operating range under the durability test protocol to be extracted, as well as the large and small load variation ranges. Based on the various parameters to be extracted, it statistically analyzes the number of start-stop cycles, idling time, high-load operating time, low-load operating time, and number of load variations in the durability test protocol, and calculates the time and number of cycles for each operating condition to obtain the vehicle operating condition spectrum of the durability test protocol. This invention provides operating condition spectrum data for the "sub-operating condition" testing method for fuel cell life assessment.

[0033] The beneficial effects of this invention are:

[0034] This invention solves the problem of the lack of methods for determining and extracting operating condition spectra in the current "operating condition-based" method for evaluating fuel cell lifespan. It provides a technical solution for extracting operating condition spectra in fuel cell durability testing protocols and provides operating condition spectrum data for the "operating condition-based" test method for fuel cell lifespan evaluation.

[0035] 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

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0037] Figure 1 This is a flowchart of a method for extracting operating conditions for fuel cell life assessment according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of a fuel cell durability testing protocol according to an embodiment of the present invention;

[0039] Figure 3This is a schematic diagram of the vehicle operating condition spectrum extraction results of the fuel cell durability testing protocol according to an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the operating condition extraction device for fuel cell life assessment according to an embodiment of the present invention;

[0041] Figure 5 This is another structural schematic diagram of a working condition extraction device for fuel cell life assessment according to an embodiment of the present invention. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0044] The following describes, with reference to the accompanying drawings, a method and apparatus for extracting operating conditions for fuel cell life assessment according to an embodiment of the present invention. First, the method for extracting operating conditions for fuel cell life assessment according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0045] Figure 1 This is a flowchart of a method for extracting operating conditions for fuel cell life assessment according to an embodiment of the present invention.

[0046] like Figure 1 As shown, the operating condition extraction method for fuel cell life assessment includes the following steps:

[0047] Step S1: Determine the range of the idling range, high-load operating range, and low-load operating range under the durability test protocol to be extracted, as well as the large-scale load variation range and the small-scale load variation range.

[0048] Understandably, durability testing protocols can use either fuel cell load curves or vehicle speed curves. Figure 2 This is a schematic diagram of a fuel cell durability testing protocol according to an embodiment of the present invention, specifically the New European Driving Cycle (NEDC) protocol. Those skilled in the art can determine the percentages for each interval based on actual circumstances; no specific limitations are made here.

[0049] Specifically, the present invention includes, but is not limited to, determining the range of the idling range, high-load operating range, and low-load operating range under the durability test protocol to be extracted, as well as parameters such as large-scale load variation and small-scale load variation.

[0050] Step S2: Based on the various parameters to be extracted, the number of start-stop cycles, idling time, high-load operation time, low-load operation time, and load variation cycles in the durability test protocol are statistically analyzed, and the time and number of cycles for each operating condition are calculated to obtain the vehicle operating condition spectrum of the durability test protocol.

[0051] Specifically, the parameters involved in step S2 and their meanings are as follows:

[0052] The number of start-stop cycles, from the beginning to the end of a single cycle, is counted as one start-stop cycle.

[0053] Idle time: Starting from the start of the fuel cell, the idle interval is defined as the period when the rated current is below a% of the rated current. The time occupied by the current value within the idle interval is recorded as the idle time.

[0054] The low-load operating time is defined as the interval between a% and b% of the rated current. The time occupied by the current value within this interval is recorded as the low-load operating time.

[0055] The high-load operating time is defined as the range from b% of the rated current to the maximum current. The time occupied by the current value within this range is recorded as the high-load operating time.

[0056] The number of load changes is statistically divided into large load changes and small load changes. Starting from fuel cell startup, current values ​​are read along the operating condition change process. The point where the current reaches its lowest point is taken as the starting point of the load change condition. If the current is lower in subsequent cycles, this point is changed as the starting point of the load change condition. A load change is recorded when the current increase reaches [(maximum current - idle current) × c%]. A load reduction is recorded when the current decrease reaches [(maximum current - idle current) × c%]. The point where the current reaches its lowest point is taken as the starting point of the load change condition. The end of one load change cycle and the beginning of the next load change cycle is recorded as a large load change. Similarly, after the start of the load change condition, when the current increase is between [(maximum value - minimum value) × d%] and [(maximum value - minimum value) × c%], it is recorded as a load change. When the current decrease reaches [(maximum value - minimum value) × d%] and [(maximum value - minimum value) × c%], it is recorded as a load decrease. When it reaches the lowest point, it is the end of the current load change cycle and the beginning of the next load change cycle, which is recorded as a small load change.

[0057] Preferably, a% of the idling time and low-load operating time can be set to 5%-15%, b% of the low-load operating time and high-load operating time can be set to 50%-65%, c% of the large load change range in the load change frequency statistics can be set to 50%-65%, and d% of the small load change range can be set to 25%-40%.

[0058] Furthermore, in one embodiment of the present invention, the method for calculating the time and number of times statistics for each working condition is as follows, wherein the single cycle time of the test protocol or driving cycle is t′(s).

[0059] Idle time t1

[0060] By calculating the fuel cell idling time t1′(s) within a single cycle, the hourly idling time in this test protocol or driving cycle can be obtained.

[0061]

[0062] The idling time t1′ of a single cycle is the time the idling value occupies within a single cycle from the start of the fuel cell.

[0063] High load operation time t2

[0064] By calculating the high-load operating time t2′(s) of the fuel cell within a single cycle, the hourly high-load operating time in this test protocol or driving cycle can be obtained as follows:

[0065]

[0066] Among them, the high-load operation time t2′ of a single cycle is the time occupied by the high-load operation interval within a single cycle from the start of fuel cell startup.

[0067] Low-load operation time t3

[0068] By calculating the low-load operating time t3′(s) of the fuel cell within a single cycle, the hourly low-load operating time in this test protocol or driving cycle can be obtained as follows:

[0069]

[0070] Among them, the low-load operation time t3′ of a single cycle is the time occupied by the low-load operation interval within a single cycle from the start of fuel cell startup.

[0071] Number of start / stop times p1

[0072] Let the start-up and shutdown of the fuel cell be considered as one start-stop cycle. By counting the number of start-stop cycles n1 within t′, the number of start-stop cycles per hour in this test protocol or driving cycle can be obtained.

[0073]

[0074] Number of load changes p2

[0075] The statistics on load changes are divided into large-scale load changes and small-scale load changes. Let p be the number of large-scale load changes per hour. 21 The number of small load changes per hour is p 22 Since the statistical methods are consistent, and only the load variation range differs, they are collectively referred to as the number of load variations p2. By calculating the corresponding number of load variations n2 of the fuel cell within a single cycle of the test protocol or driving cycle, the number of load variations per hour in that test protocol can be obtained.

[0076]

[0077] The statistical method for the number of load changes n2 in a single cycle of the test protocol or driving cycle is as follows: starting from the start of the fuel cell, read the measured values ​​along the working condition change process, and take the point where the measured value is at its lowest point as the starting point of the load change condition. If there is an even lower current point in the subsequent process, change this point as the starting point of the load change condition. When the increase in the measured value reaches the load change range, it is recorded as one load change. When the decrease in the measured value reaches the load change range, it is recorded as one load change cycle. When the value reaches its lowest point, it is the end of the current load change cycle and the beginning of the next load change cycle.

[0078] Furthermore, combined Figure 2 and Figure 3 The results of the operating condition extraction method for fuel cell life assessment according to embodiments of the present invention are explained.

[0079] As an example, for such Figure 2 The operating condition spectrum of the New European Driving Cycle Protocol (NEDC) is extracted as shown. In the idle range, a% is set to 15%, b% is set to 60% in the low-load and high-load operating ranges, c% is set to 60% in the large load variation range, and d% is set to 30% in the small load variation range.

[0080] As an example, Figure 3 This is a schematic diagram of the vehicle operating condition spectrum extraction results of the fuel cell durability testing protocol according to an embodiment of the present invention, as shown below. Figure 3 As shown, the idling time is 1508 s·h. -1 The low-load operating time is 1380 s·h -1 The high-load operation time is 712 s·h -1 The number of significant load changes is 3 cycles·h -1 The number of minor load changes is 24 cycles per hour. -1 The number of start-stop cycles is 3 cycles·h -1 .

[0081] Through the above steps, the ranges of the idling range, high-load operating range, and low-load operating range under the durability test protocol to be extracted are determined, as well as the amplitude of large load changes and small load changes. Based on the various parameters to be extracted, the number of start-stop cycles, idling time, high-load operating time, low-load operating time, and number of load changes in the durability test protocol are statistically analyzed, and the time and number of cycles for each operating condition are calculated to obtain the vehicle operating condition spectrum of the durability test protocol. This invention fills the gap in the determination and extraction methods of operating condition spectrum when evaluating fuel cell life based on the "operating condition-specific" method, providing a technical solution for the extraction of operating condition spectrum for fuel cell durability test protocols, and providing operating condition spectrum data for the "operating condition-specific" test method for fuel cell life evaluation.

[0082] It should be noted that when evaluating fuel cell life based on the "different operating conditions" method, there are multiple ways to determine and extract the operating condition spectrum. However, regardless of the specific implementation method, as long as the method can provide a technical solution for extracting the operating condition spectrum of the fuel cell durability test protocol and provide operating condition spectrum data for the "different operating conditions" test method for fuel cell life evaluation, it is a solution to the existing technical problems and has the corresponding effect.

[0083] To achieve the above embodiments, such as Figure 4 As shown, this embodiment also provides a working condition extraction device 10 for fuel cell life evaluation. The device 10 includes a determination module 100 and a statistics module 200.

[0084] The determination module 100 is used to determine the range of the idling range, high load operating range and low load operating range under the durability test protocol to be extracted, as well as the large load change range and small load change range.

[0085] The statistics module 200 is used to statistically analyze the number of start-stop cycles, idling time, high-load operation time, low-load operation time, and load variation cycles in the durability test protocol based on various parameters to be extracted, and to calculate the time and number of cycles for each operating condition, thereby obtaining the vehicle operating condition spectrum of the durability test protocol.

[0086] Furthermore, the number of start-stop cycles is defined as one start-stop cycle from the beginning to the end of a single loop;

[0087] Idle time is defined as the period from the start of fuel cell startup, during which the current value is below a% of the rated current, and the time occupied by the current value within the idle time range is recorded.

[0088] The low-load operation time is defined as the interval between a% and b% of the rated current. The time occupied by the current value within this interval is statistically analyzed.

[0089] The high-load operation time is defined as the range from b% of the rated current to the maximum current, and the time occupied by the current value within this range is statistically analyzed.

[0090] The load variation cycle is divided into large load variation cycle and small load variation cycle. Starting from the start of the fuel cell, the current value is read along the operating condition change process. The point when the current is at its lowest point is taken as the start point of the load variation condition. When the current increase reaches [(maximum current - idle current) × c%], a load is recorded. When the current decrease reaches [(maximum current - idle current) × c%], a load decrease is recorded. When the current reaches its lowest point, the current variation cycle ends and the next cycle begins, which is a large load variation. After the start point of the load variation condition, when the current increase is between [(maximum value - minimum value) × d%] and [(maximum value - minimum value) × c%], a load is recorded. When the current decrease reaches [(maximum value - minimum value) × d%] and [(maximum value - minimum value) × c%], a load decrease is recorded. When the current reaches its lowest point, the current variation cycle ends and the next cycle begins, which is a small load variation.

[0091] Furthermore, the percentage of idling time and low-load operation time is set to 5%-15%, the percentage of low-load operation time and high-load operation time is set to 50%-65%, the percentage of large load change is set to 50%-65%, and the percentage of small load change is set to 25%-40%.

[0092] like Figure 5 As shown, in this embodiment of the invention, the statistics module 200 includes:

[0093] The first statistical submodule 201 is used to calculate the fuel cell idling time t1′(s) within a single cycle for the idling time t1, and obtain the idling time per hour in the durability test protocol or driving cycle as follows:

[0094]

[0095] Among them, the idling time t1′ of a single cycle starts from the start of the fuel cell and is the time occupied by the idling value in a single cycle;

[0096] The second statistical submodule 202 is used to calculate the high-load operating time t2′(s) of the fuel cell within a single cycle for the high-load operating time t2, and obtain the hourly high-load operating time in the durability test protocol or driving cycle as follows:

[0097]

[0098] Among them, the high-load operation time t2′ of a single cycle starts from the start of the fuel cell and is the time occupied by the high-load operation interval within a single cycle;

[0099] The third statistical submodule 203 is used to calculate the low-load operating time t3′(s) of the fuel cell within a single cycle for the low-load operating time t3, and obtain the hourly low-load operating time in the durability test protocol or driving cycle as follows:

[0100]

[0101] Among them, the low-load operation time t3′ of a single cycle is the time occupied by the low-load operation interval within a single cycle, starting from the start of the fuel cell.

[0102] The fourth statistics submodule 204 is used to count the number of fuel cell start-ups and shutdowns within t′, where the start-up to shutdown period of the fuel cell is considered as one start-up and shutdown cycle, for each start-up and shutdown cycle p1. This yields the number of start-ups and shutdowns per hour in the durability test protocol or driving cycle.

[0103]

[0104] The fifth statistics submodule 205 is used to calculate the corresponding number of load changes n2 of the fuel cell within a single cycle of the durability test protocol or driving cycle for the number of load changes p2, thus obtaining the number of load changes per hour in the durability test protocol:

[0105]

[0106] Furthermore, the aforementioned fifth statistical submodule 205 is also used for:

[0107] Starting from the start of the fuel cell, the measured values ​​are read along the operating condition change process. The point where the measured value is at its lowest is taken as the starting point of the variable load condition. When the increase in the measured value reaches the variable load range, a load is recorded. When the decrease in the measured value reaches the variable load range, a load cycle is recorded. The point where the value reaches its lowest value marks the end of the current load cycle and the beginning of the next load cycle.

[0108] According to an embodiment of the present invention, a working condition extraction device for fuel cell life assessment determines the range of the idling range, high-load operating range, and low-load operating range under the durability test protocol to be extracted, as well as the large and small load variation ranges. Based on the various parameters to be extracted, the device statistically analyzes the number of start-stop cycles, idling time, high-load operating time, low-load operating time, and number of load variations in the durability test protocol, and calculates the time and number of cycles for each working condition to obtain the vehicle working condition spectrum of the durability test protocol. This invention fills the gap in the determination and extraction methods of the working condition spectrum when assessing fuel cell life based on a "different working condition" method, providing a technical solution for extracting the working condition spectrum of fuel cell durability test protocols, and providing working condition spectrum data for the "different working condition" test method of fuel cell life assessment.

[0109] It should be noted that the foregoing explanation of the operating condition extraction method embodiment for fuel cell life assessment also applies to the operating condition extraction device for fuel cell life assessment in this embodiment, and will not be repeated here.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0111] In the description of this specification, the 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 present 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0112] 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 extracting operating conditions for fuel cell life assessment, characterized by, The method comprises the following steps: S1, determining the ranges of the idling interval, the large-load running interval and the small-load running interval under the durability test protocol to be extracted, and the large-amplitude load variation and the small-amplitude load variation; S2, based on various parameters to be extracted, counting the start-stop times, the idling time, the large-load running time, the small-load running time and the load variation times in the durability test protocol, and calculating the time and the number of times of each working condition to obtain the vehicle working condition spectrum of the durability test protocol; The start-stop times are counted as one start-stop from the beginning to the end of a single cycle; The idling time is counted as the time of the current value in the idling interval below a% of the rated current from the start of the fuel cell startup; The small-load running time is counted as the time of the current value in the interval from a% of the rated current to b% of the rated current; The large-load running time is counted as the time of the current value in the interval from b% of the rated current to the maximum current; The load variation times are divided into the large-amplitude load variation times and the small-amplitude load variation times, the current value is read along the working condition change course from the start of the fuel cell startup, the start point of the load variation working condition is taken as the point at which the current is at the extreme low point, one loading is counted when the current increase amplitude reaches [(maximum current-idling current)×c%], one unloading is counted when the current decrease amplitude reaches [(maximum current-idling current)×c%], and the extreme low point is the end of the current load variation cycle and the start of the next load variation cycle, which is the large-amplitude load variation; after the start point of the load variation working condition, one loading is counted when the current increase amplitude is [(maximum value-minimum value)×d%], one unloading is counted when the current decrease amplitude reaches [(maximum value-minimum value)×d%], and the extreme low point is the end of the current load variation cycle and the start of the next load variation cycle, which is the small-amplitude load variation; a% in the idling time and the small-load running time is set to 5%-15%, b% in the small-load running time and the large-load running time is set to 50%-65%, c% in the large-amplitude load variation of the load variation times is set to 50%-65%, and d% in the small-amplitude load variation is set to 25%-40%; The individual cycle time of the durability test protocol or driving cycle is (s), For idle time , the individual cycle fuel cell idle time is counted (s), and the hourly idle time in the durability test protocol or drive cycle is given by: wherein the idle time for a single cycle The idle time for a single cycle from the start of fuel cell start-up; for large load operation time , the fuel cell large load operation time within a single cycle is counted (s), the large load operation time per hour in the durability test protocol or driving cycle is obtained as: wherein the single cycle large load operation time The time occupied by the large load operation section in the single cycle from the start of the fuel cell For small load run time Statistical individual cycle fuel cell small load run time (s) to obtain the small load run time per hour in the durability test protocol or drive cycle as: wherein the single cycle low load operation time The time occupied by the low load operation section in a single cycle from the start of the fuel cell For the number of start-stop , record the fuel cell start-up to shut-down as one start-stop, count the number of fuel cell start-stops , obtain the number of start-stops per hour in the durability test protocol or drive cycle as: for the number of cycles , counting the number of cycles of the corresponding variable load in the durability test protocol or in a single cycle of the driving cycle , obtaining the number of cycles of the variable load per hour in the durability test protocol as ； Statistical number of load cycles comprising: The measurement value is read along the working condition change course from the start of the fuel cell startup, the start point of the load variation working condition is taken as the point at which the measurement value is at the extreme low point, one loading is counted when the measurement value increase amplitude reaches the load variation amplitude, one load variation cycle is counted when the measurement value decrease amplitude reaches the load variation amplitude, and the extreme low value is the end of the current load variation cycle and the start of the next load variation cycle.

2. A working condition extraction device for fuel cell life evaluation, characterized by comprising: The method comprises the following steps: A determining module is configured to determine the ranges of the idling interval, the large-load running interval and the small-load running interval under the durability test protocol to be extracted, and the large-amplitude load variation and the small-amplitude load variation; A counting module is configured to count the start-stop times, the idling time, the large-load running time, the small-load running time and the load variation times in the durability test protocol based on various parameters to be extracted, and calculate the time and the number of times of each working condition to obtain the vehicle working condition spectrum of the durability test protocol; The start-stop times are counted as one start-stop from the beginning to the end of a single cycle; The idling time is the time of the current value in the idling interval, which is a% of the rated current, recorded from the start of the fuel cell; The small load operation time is the time of the current value in the small load operation interval, which is a% to b% of the rated current; The large load operation time is the time of the current value in the large load operation interval, which is b% to the maximum current; The variable load times are divided into large variable load times and small variable load times, the current value is read along the working condition change course from the start of the fuel cell, the variable load working condition starting point is taken when the current is at the extreme low point, one loading is recorded when the current increase amplitude reaches [(maximum current-idling current)×c%], one unloading is recorded when the current decrease amplitude reaches [(maximum current-idling current)×c%], and the extreme low point is the end of the current variable load cycle and the start of the next variable load cycle, which is the large variable load; after the variable load working condition starting point, one loading is recorded when the current increase amplitude is [(maximum value-minimum value)×d%], one unloading is recorded when the current decrease amplitude reaches [(maximum value-minimum value)×d%], and the extreme low point is the end of the current variable load cycle and the start of the next variable load cycle, which is the small variable load; a% in the idling time and the small load operation time is set to 5%-15%, b% in the small load operation time and the large load operation time is set to 50%-65%, c% in the large variable load amplitude of the variable load times is set to 50%-65%, and d% in the small variable load amplitude is set to 25%-40%; The statistical module comprises: a first statistical sub-module for counting the idling time within a single cycle (s) for each hour of the durability test protocol or driving cycle is:​ wherein the idle time for a single cycle The idle time for a single cycle from the start of fuel cell start-up; a second statistical sub-module for counting the large load operation time within a single cycle , the large load operation time per hour in the durability test protocol or driving cycle is obtained as: (s), the large load operation time per hour in the durability test protocol or driving cycle is obtained as: wherein the single cycle large load operation time the time occupied by the large load operation section within a single cycle from the start of the fuel cell The third statistical sub-module is for small load operation time , the small load operation time in each hour in the durability test protocol or driving cycle is obtained as follows: (s), wherein the single cycle low load operation time The time occupied by the low load operation section in a single cycle from the start of the fuel cell a fourth statistical sub-module, configured to count the number of start-stop times for each hour in the durability test protocol or driving cycle for each hour in the durability test protocol or driving cycle for each hour in the durability test protocol or driving cycle a fifth statistical sub-module, configured to count the number of load changes in the durability test protocol or a single cycle of the driving cycle , and obtain the number of load changes per hour in the durability test protocol , as ； The fifth statistical submodule is further configured to: The measurement value is measured along the working condition change course from the start of the fuel cell, the variable load working condition starting point is taken when the measurement value is at the extreme low point, one loading is recorded when the measurement value increase amplitude reaches the variable load amplitude, one variable load cycle is recorded when the measurement value decrease amplitude reaches the variable load amplitude, and the extreme low value is the end of the current variable load cycle and the start of the next variable load cycle.

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