Fuel cell performance determination method, device, system, vehicle and cloud server

Abstract

The present application relates to a method, device, system, vehicle and cloud server for determining fuel cell performance, and relates to the field of fuel cell technology. At least the technical problem of poor accuracy in determining fuel cell performance in related technologies is solved. It includes: obtaining multiple sets of operating data of the fuel cell; determining the current performance information of the fuel cell based on the multiple sets of operating data; determining a first difference between the current performance information and the first performance information, and a second difference between the first performance information and the second performance information, the first performance information is the performance information when the fuel cell is not attenuated, and the second performance information is the performance information when the attenuation degree of the fuel cell is a preset attenuation degree; based on the first difference and the second difference, determining the current attenuation degree of the fuel cell, the attenuation degree of the fuel cell is used to evaluate the performance of the fuel cell.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a method, device, system, vehicle and cloud server for determining fuel cell performance. Background Art

[0002] With the rapid development of new energy vehicles, fuel cells have the advantages of zero emissions, high efficiency and fast refueling (such as hydrogen), and are an important direction for the development of new energy vehicles. The actual output voltage of the fuel cell decreases as the output current increases, showing the following Figure 1 The current-voltage characteristic diagram shown is the IV curve (or polarization curve), and the IV curve is usually used to describe the output performance of the fuel cell. However, as the working time of the fuel cell increases, its IV curve is not static. The fuel cell will experience various operating conditions during operation, resulting in irreversible attenuation of the catalyst, catalyst carbon carrier, diffusion layer, proton exchange membrane, etc., so that the corresponding voltage at each current point decreases to varying degrees. The IV curve is the most direct representation of the output performance of the fuel cell, so the decline of the IV curve can intuitively show the degree of performance attenuation of the fuel cell (that is, the health status of the fuel cell).

[0003] At present, the health status of the fuel cell is mainly predicted by testing the performance attenuation of the fuel cell under specific working conditions, and determining the intercept of the fuel cell output voltage and the output voltage at the end of the fuel cell life under the time-varying curve of the specified current. This can only reflect the voltage attenuation characteristics and health status under certain specific currents, but the operating conditions of the actual vehicle are complex and changeable. The test data under specific working conditions cannot accurately represent the actual performance of the fuel cell under actual vehicle working conditions.

[0004] In the related art, document CN 111007402 B obtains the operating data of the vehicle during startup, operation and shutdown, adds it to the workflow of the fuel cell durability test, obtains the polarization curve of the fuel cell under the operating data, and then obtains the durability test result of the fuel cell. This method determines the durability test result of the fuel cell only by the polarization curve of the fuel cell under the operating data. Since the data involved are relatively single, the accuracy of the durability parameters of the determined fuel cell is poor. In another related art, document CN 115983084 A obtains the output voltage signal of the fuel cell and the battery polarization curve of each time period, and inputs them into the established model, and predicts the results through the model based on the input data. This technology predicts the remaining life of the fuel cell through the model, which requires the model to be created and trained in advance. The whole process is complicated and time-consuming, and the model training may be abnormal, resulting in large errors in the prediction results. Therefore, the accuracy of determining the performance of the fuel cell is currently poor. Summary of the invention

[0005] The present application provides a method, device, system, vehicle and cloud server for determining fuel cell performance. The purpose of the present application is to at least solve the technical problem of poor accuracy in determining fuel cell performance in related technologies.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is as follows:

[0007] According to the first aspect provided by the present application, a method for determining fuel cell performance is provided, the method comprising: obtaining multiple sets of operating data of the fuel cell; determining current performance information of the fuel cell based on the multiple sets of operating data; determining a first difference between the current performance information and the first performance information, and a second difference between the first performance information and the second performance information, the first performance information being performance information when the fuel cell is not attenuated, and the second performance information being performance information when the attenuation degree of the fuel cell is a preset attenuation degree; based on the first difference and the second difference, determining the current attenuation degree of the fuel cell, the attenuation degree of the fuel cell is used to evaluate the performance of the fuel cell.

[0008] According to the above technical means, the present application can determine the current performance information of the fuel cell based on multiple groups of operating data of the fuel cell. Then, in combination with the predetermined first performance information when the fuel cell is not attenuated, and the second performance information when the attenuation degree of the fuel cell is a preset attenuation degree, the first difference between the current performance information and the first performance information, and the second difference between the first performance information and the second performance information are determined. Thus, based on the first difference and the second difference, the current attenuation degree of the fuel cell is determined to evaluate the performance of the fuel cell. Through the above method, since the fuel cell has different performance information when it produces different degrees of attenuation, and the performance information of the fuel cell can be accurately determined based on the operating data of the fuel cell. Therefore, the current attenuation degree of the fuel cell can be determined based on the difference between the current performance information of the fuel cell, the first performance information, and the second performance information, so that the accuracy of determining the performance of the fuel cell can be improved.

[0009] In one possible implementation, the current performance information of the fuel cell is represented by a target performance curve, the first performance information is represented by a first performance curve, and the second performance information is represented by a second performance curve; the above-mentioned determination of the first difference between the current performance information and the first performance information, and the second difference between the first performance information and the second performance information, includes: determining the area of ​​a first closed area formed by the target performance curve and the first performance curve, and the area of ​​a second closed area formed by the first performance curve and the second performance curve, the area of ​​the first closed area being used to indicate the first difference, and the area of ​​the second closed area being used to indicate the second difference.

[0010] According to the above technical means, the present application can represent the performance information through the performance curve. Therefore, when determining the difference between different performance information, the corresponding difference can be represented based on the area of ​​the closed area formed between the corresponding performance curves. In this way, the corresponding difference can be determined intuitively and accurately through the area of ​​the closed area formed between the curves, thereby improving the accuracy of the subsequent determination of the fuel cell performance.

[0011] In a possible embodiment, the above-mentioned determination of the current performance information of the fuel cell based on multiple groups of operating data includes: obtaining multiple preset power values, and determining at least one group of operating data corresponding to each of the multiple preset power values ​​from the multiple groups of operating data; for any one of the multiple preset power values, based on the coordinate points of at least one group of operating data corresponding to any one of the preset power values ​​in the preset coordinate system, determining the center coordinate point corresponding to any one of the multiple preset power values ​​in the preset coordinate system; connecting the center coordinate points corresponding to each of the multiple preset power values ​​in the preset coordinate system in sequence to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve.

[0012] According to the above technical means, the present application can determine at least one set of operating data corresponding to each preset power value from multiple sets of operating data based on multiple preset power values. Then, based on the coordinate points of at least one set of operating data corresponding to each preset power value in the preset coordinate system, determine the center coordinate point corresponding to each preset power value in the preset coordinate system. In this way, based on the connection line of the center coordinate point corresponding to each preset power value in the preset coordinate system among the multiple preset power values, the target performance curve corresponding to the fuel cell can be determined. Through the above method, the corresponding target performance curve can be accurately determined according to the distribution positions of multiple sets of operating data in the preset coordinate system, thereby improving the accuracy of determining the performance curve.

[0013] In a possible implementation, each group of operating data in the multiple groups of operating data includes: net output power; the above-mentioned determination of at least one group of operating data corresponding to each preset power value in the multiple preset power values ​​from the multiple groups of operating data includes: for any preset power value in the multiple preset power values, determining the power interval corresponding to any preset power value; determining at least one group of operating data in the multiple groups of operating data whose net output power is in the power interval corresponding to any preset power value as at least one group of operating data corresponding to any preset power value.

[0014] According to the above technical means, the present application can first determine the power interval corresponding to each preset power value, and then determine at least one set of operating data corresponding to each preset power value based on the power interval of the net output power included in each set of operating data in the multiple sets of operating data. In this way, at least one set of operating data corresponding to each preset power value can be accurately determined, thereby improving the accuracy of the subsequent determination of the target performance curve corresponding to the fuel cell.

[0015] In a possible implementation, each set of operating data in the multiple sets of operating data also includes: a stack current and a stack voltage, and the fuel cell also includes an auxiliary module, and the auxiliary module includes at least one of the following: a hydrothermal control module, a fuel supply module, and an air supply module; the above-mentioned acquisition of multiple sets of operating data of the fuel cell includes: determining the error power based on the requested power corresponding to the fuel cell at any moment, and the net output power of the fuel cell determined at the previous moment at any moment; determining the stack current, stack voltage and stack power corresponding to the fuel cell at any moment based on the error power; determining the net output power of the fuel cell at any moment based on the stack power and the power consumption of the auxiliary module.

[0016] According to the above technical means, the present application can determine the error power based on the requested power corresponding to the fuel cell at any moment and the net output power of the fuel cell determined at the previous moment at any moment. Then, the stack current, stack voltage and stack power corresponding to the fuel cell at any moment are determined based on the error power. Furthermore, based on the stack power and the power consumption of the auxiliary module, the net output power of the fuel cell at any moment can be determined. In this way, a specific method for determining the stack current, stack voltage, stack power and net output power at each moment is given, which can improve the accuracy of determining the operating data of the fuel cell.

[0017] In a possible embodiment, the fuel cell also includes a DCDC converter, and the stack is connected to the input end of the DCDC converter; the above-mentioned determination of the stack current, stack voltage and stack power corresponding to the fuel cell at any time based on the error power includes: determining the input current of the DCDC converter at any time based on the error power; adjusting the current value of the input end of the DCDC converter based on the input current of the DCDC converter, and determining the stack current, stack voltage and stack power corresponding to the fuel cell at any time.

[0018] According to the above technical means, the present application can determine the input current of the DCDC converter at any time based on the error power, thereby adjusting the current value of the input end of the DCDC converter, and the change of the current value of the input end of the DCDC converter can cause the change of the stack current, stack voltage and stack power, so it is necessary to determine the stack current, stack voltage and stack power corresponding to the fuel cell at any time. In this way, the stack current, stack voltage and stack power corresponding to the fuel cell can be accurately determined.

[0019] In a possible implementation, the method further includes: adjusting operating parameters of the auxiliary module based on the current attenuation degree of the fuel cell, wherein the adjusted operating parameters of the auxiliary module are used to optimize the performance of the fuel cell; and determining the power consumption of the auxiliary module based on the adjusted operating parameters of the auxiliary module.

[0020] According to the above technical means, the present application can further adjust the operating parameters of the auxiliary module based on the current attenuation degree of the determined fuel cell, thereby determining the power consumption of the auxiliary module based on the adjusted operating parameters of the auxiliary module. In this way, the performance of the fuel cell can be further optimized based on the adjusted operating parameters of the auxiliary module, thereby increasing the service life of the fuel cell.

[0021] In one possible embodiment, the method also includes: adjusting the requested power corresponding to the fuel cell based on the current attenuation degree of the fuel cell, the adjusted requested power corresponding to the fuel cell is inversely proportional to the current attenuation degree of the fuel cell; and determining the operating parameters of the fuel cell based on the adjusted requested power corresponding to the fuel cell.

[0022] According to the above technical means, the present application can further adjust the requested power corresponding to the fuel cell based on the determined current attenuation degree of the fuel cell, thereby determining the operating parameters of the fuel cell based on the adjusted requested power corresponding to the fuel cell. In this way, the operating parameters of the fuel cell can be further optimized to increase the service life of the fuel cell.

[0023] According to the second aspect provided by the present application, a fuel cell performance determination device is provided, and the fuel cell performance determination device includes: an acquisition module and a processing module; the acquisition module is used to acquire multiple groups of operating data of the fuel cell; the processing module is used to determine the current performance information of the fuel cell based on the multiple groups of operating data; the processing module is also used to determine a first difference between the current performance information and the first performance information, and a second difference between the first performance information and the second performance information, the first performance information is the performance information when the fuel cell is not attenuated, and the second performance information is the performance information when the attenuation degree of the fuel cell is a preset attenuation degree; the processing module is also used to determine the current attenuation degree of the fuel cell based on the first difference and the second difference, and the attenuation degree of the fuel cell is used to evaluate the performance of the fuel cell.

[0024] In one possible implementation, the current performance information of the fuel cell is represented by a target performance curve, the first performance information is represented by a first performance curve, and the second performance information is represented by a second performance curve; the processing module is specifically used to determine the area of ​​a first closed region formed by the target performance curve and the first performance curve, and the area of ​​a second closed region formed by the first performance curve and the second performance curve, the area of ​​the first closed region being used to indicate a first difference amount, and the area of ​​the second closed region being used to indicate a second difference amount.

[0025] In a possible embodiment, the acquisition module is also used to acquire multiple preset power values, and determine at least one group of operating data corresponding to each of the multiple preset power values ​​from multiple groups of operating data; the processing module is specifically used to determine, for any one of the multiple preset power values, a central coordinate point corresponding to any one of the multiple preset power values ​​in the preset coordinate system based on the coordinate points of at least one group of operating data corresponding to any one of the preset power values ​​in the preset coordinate system; the processing module is specifically used to connect the central coordinate points corresponding to each of the multiple preset power values ​​in the preset coordinate system in sequence to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve.

[0026] In one possible implementation, each group of operating data in the multiple groups of operating data includes: net output power; a processing module, specifically used to determine, for any one of a plurality of preset power values, a power interval corresponding to any preset power value; a processing module, specifically used to determine at least one group of operating data in the multiple groups of operating data, whose net output power is in the power interval corresponding to any preset power value, as at least one group of operating data corresponding to any preset power value.

[0027] In a possible implementation, each group of operating data in the multiple groups of operating data also includes: a stack current and a stack voltage, and the fuel cell also includes an auxiliary module, and the auxiliary module includes at least one of the following: a hydrothermal control module, a fuel supply module, and an air supply module; the processing module is also used to determine the error power based on the requested power corresponding to the fuel cell at any moment, and the net output power of the fuel cell determined at the previous moment at any moment; the processing module is also used to determine the stack current, stack voltage and stack power corresponding to the fuel cell at any moment based on the error power; the processing module is also used to determine the net output power of the fuel cell at any moment based on the stack power and the power consumption of the auxiliary module.

[0028] In one possible implementation, the fuel cell also includes a DCDC converter, and the stack is connected to the input end of the DCDC converter; a processing module is specifically used to determine the input current of the DCDC converter at any time based on the error power; the processing module is specifically used to adjust the current value of the input end of the DCDC converter based on the input current of the DCDC converter, and determine the stack current, stack voltage and stack power corresponding to the fuel cell at any time.

[0029] In one possible implementation, the processing module is also used to adjust the operating parameters of the auxiliary module based on the current attenuation degree of the fuel cell, and the adjusted operating parameters of the auxiliary module are used to optimize the performance of the fuel cell; the processing module is also used to determine the power consumption of the auxiliary module based on the adjusted operating parameters of the auxiliary module.

[0030] In one possible implementation, the processing module is also used to adjust the requested power corresponding to the fuel cell based on the current attenuation degree of the fuel cell, and the adjusted requested power corresponding to the fuel cell is inversely proportional to the current attenuation degree of the fuel cell; the processing module is also used to determine the operating parameters of the fuel cell based on the adjusted requested power corresponding to the fuel cell.

[0031] According to the third aspect provided by the present application, an electronic device is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0032] According to the fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device executes the method in the above-mentioned first aspect and any possible implementation method thereof.

[0033] According to a fifth aspect provided by the present application, a vehicle is provided, the vehicle comprising a fuel cell performance determination device as in the second aspect, the vehicle being used to implement a method as in the first aspect and any possible implementation manner thereof.

[0034] According to the sixth aspect provided by the present application, a computer program product is provided, the computer program product comprising computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0035] According to the seventh aspect provided by the present application, a fuel cell performance determination system is provided, the fuel cell performance determination system includes a vehicle and a cloud server, and the fuel cell performance determination system is used to implement the method as in the first aspect and any possible implementation manner thereof.

[0036] According to the eighth aspect provided by the present application, a cloud server is provided, which includes a fuel cell performance determination device as in the second aspect, and the cloud server is used to implement a method as in the first aspect and any possible implementation manner thereof.

[0037] Therefore, the above technical features of the present application have the following beneficial effects:

[0038] (1) The present application can determine the current performance information of the fuel cell based on multiple groups of operating data of the fuel cell. Then, in combination with the predetermined first performance information when the fuel cell is not attenuated, and the second performance information when the attenuation degree of the fuel cell is a preset attenuation degree, the first difference between the current performance information and the first performance information, and the second difference between the first performance information and the second performance information are determined. Thus, based on the first difference and the second difference, the current attenuation degree of the fuel cell is determined to evaluate the performance of the fuel cell. Through the above method, since the fuel cell has different performance information when it produces different degrees of attenuation, and the performance information of the fuel cell can be accurately determined based on the operating data of the fuel cell. Therefore, the current attenuation degree of the fuel cell can be determined based on the difference between the current performance information of the fuel cell, the first performance information, and the second performance information, so that the accuracy of determining the performance of the fuel cell can be improved.

[0039] (2) The present application can represent performance information through performance curves. Therefore, when determining the difference between different performance information, the corresponding difference can be represented based on the area of ​​the closed area formed between the corresponding performance curves. In this way, the corresponding difference can be determined intuitively and accurately through the area of ​​the closed area formed between the curves, thereby improving the accuracy of subsequent determination of fuel cell performance.

[0040] (3) The present application can determine at least one set of operating data corresponding to each preset power value from multiple sets of operating data based on multiple preset power values. Then, based on the coordinate points of at least one set of operating data corresponding to each preset power value in the preset coordinate system, determine the center coordinate point corresponding to each preset power value in the preset coordinate system. In this way, based on the connection line of the center coordinate point corresponding to each preset power value in the preset coordinate system among the multiple preset power values, the target performance curve corresponding to the fuel cell can be determined. Through the above method, the corresponding target performance curve can be accurately determined according to the distribution positions of multiple sets of operating data in the preset coordinate system, thereby improving the accuracy of determining the performance curve.

[0041] (4) The present application can first determine the power interval corresponding to each preset power value, and then determine at least one set of operating data corresponding to each preset power value based on the power interval of the net output power included in each set of operating data in the multiple sets of operating data. In this way, at least one set of operating data corresponding to each preset power value can be accurately determined, thereby improving the accuracy of the subsequent determination of the target performance curve corresponding to the fuel cell.

[0042] (5) The present application can determine the error power based on the requested power corresponding to the fuel cell at any moment and the net output power of the fuel cell determined at the previous moment at any moment. Then, the stack current, stack voltage and stack power corresponding to the fuel cell at any moment are determined based on the error power. Furthermore, based on the stack power and the power consumption of the auxiliary module, the net output power of the fuel cell at any moment can be determined. In this way, a specific method for determining the stack current, stack voltage, stack power and net output power at each moment is given, which can improve the accuracy of determining the operating data of the fuel cell.

[0043] (6) The present application can determine the input current of the DCDC converter at any time based on the error power, thereby adjusting the current value of the input of the DCDC converter, and the change of the current value of the input of the DCDC converter can cause the change of the stack current, stack voltage and stack power, so it is necessary to determine the stack current, stack voltage and stack power corresponding to the fuel cell at any time. In this way, the stack current, stack voltage and stack power corresponding to the fuel cell can be accurately determined.

[0044] (7) The present application can further adjust the operating parameters of the auxiliary module based on the determined current attenuation degree of the fuel cell, thereby determining the power consumption of the auxiliary module based on the adjusted operating parameters of the auxiliary module. In this way, the performance of the fuel cell can be further optimized based on the adjusted operating parameters of the auxiliary module, thereby increasing the service life of the fuel cell.

[0045] (8) The present application can further adjust the requested power corresponding to the fuel cell based on the determined current attenuation degree of the fuel cell, thereby determining the operating parameters of the fuel cell based on the adjusted requested power corresponding to the fuel cell. In this way, the operating parameters of the fuel cell can be further optimized to increase the service life of the fuel cell.

[0046] It should be noted that the technical effects brought about by any implementation method in the second to eighth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0047] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0049] Figure 1 is a current-voltage characteristic diagram according to an exemplary embodiment;

[0050] Figure 2 is a schematic diagram showing a result of a fuel cell according to an exemplary embodiment;

[0051] Figure 3 is an IV curve diagram corresponding to a fuel cell according to an exemplary embodiment;

[0052] Figure 4 is a schematic structural diagram of a fuel cell performance determination system according to an exemplary embodiment;

[0053] Figure 5 is a flow chart showing a method for determining fuel cell performance according to an exemplary embodiment;

[0054] Figure 6 is a flow chart showing another method for determining fuel cell performance according to an exemplary embodiment;

[0055] Figure 7 is a time series data diagram showing a parameter changing based on time according to an exemplary embodiment;

[0056] Figure 8 is a coordinate point map shown according to an exemplary embodiment;

[0057] Fig. 9 is a time series data diagram after screening according to an exemplary embodiment;

[0058] Fig.10 is a filtered coordinate point map shown according to an exemplary embodiment;

[0059] Fig.11 is a schematic diagram of a coordinate point cluster according to an exemplary embodiment;

[0060] Fig.12 is a schematic diagram of a target performance curve corresponding to a fuel cell according to an exemplary embodiment;

[0061] Fig.13 is a schematic diagram of a target performance curve corresponding to another fuel cell according to an exemplary embodiment;

[0062] Fig.14 is a flow chart showing another method for determining fuel cell performance according to an exemplary embodiment;

[0063] Fig.15 is a flow chart showing another method for determining fuel cell performance according to an exemplary embodiment;

[0064] Fig.16 is another coordinate point map shown according to an exemplary embodiment;

[0065] Fig.17 is a flow chart showing another method for determining fuel cell performance according to an exemplary embodiment;

[0066] Fig.18 is a block diagram of a fuel cell performance determination device according to an exemplary embodiment;

[0067] Fig.19 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0068] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0070] Fuel cells, also known as fuel cell engines, are the main power units in fuel cell vehicles, and play an important role in converting chemical energy in fuel (such as hydrogen) into electrical energy. Figure 2As shown, a schematic diagram of the structure of a fuel cell, the fuel cell engine is mainly composed of a fuel cell stack, an air supply subsystem, a water heat management subsystem, a hydrogen supply subsystem, a fuel cell dedicated DC-to-DC converter (DC-to-DC converter, DCDC) and other subsystems. Specifically including: hydrogen storage tank, pressure reducing valve, proportional valve, ejector, hydrogen-water separator, purge valve, air pressure sensor, humidifier, intercooler, air compressor, intake air mass flow sensor, air filter, bypass throttle, bypass mass flow sensor, back pressure throttle and other components. The fuel cell dedicated DCDC is also connected to the vehicle control unit (VCU), DC-to-AC converter (DCAC), power battery, unidirectional DCDC, vehicle heating network PTC, and DCAC is also connected to the drive motor.

[0071] During operation, the fuel cell adjusts the DCDC input current (equivalent to the fuel cell stack current) to control the operating power of the fuel cell. The air supply subsystem, water thermal management subsystem, and hydrogen supply subsystem determine and maintain the corresponding flow, pressure, water temperature and other operating conditions according to the operating power of the fuel cell. Therefore, the net output power of the fuel cell is equal to the operating power of the fuel cell minus the total parasitic power consumed by the components of each subsystem. During the actual operation of the vehicle, the VCU determines and sends the required power request (i.e. the requested power corresponding to the fuel cell) to the fuel cell controller (FCCU). The FCCU adjusts the DCDC input current to achieve precise control of the net output power of the fuel cell. This process is called engine power closed-loop control.

[0072] Exemplarily, as shown in Formula 1, the actual output voltage of the fuel cell can be expressed as the voltage upper limit (i.e., reversible voltage) provided by thermodynamics minus various voltage losses:

[0073] V out =E r -η act -η ohm -η conc Formula 1

[0074] Among them, V out is the actual output voltage of the fuel cell, E r represents the upper limit of voltage provided by thermodynamics, i.e., the reversible voltage, η act is the activation loss, η ohm is the ohmic loss, η conc is the mass transfer loss. act As the reaction rate increases, according to Ohm's law, the Ohmic loss η ohmAs the output current increases, it increases approximately linearly, while the mass transfer loss η conc It is very significant under high current. Therefore, the actual output voltage of the fuel cell decreases as the output current increases, showing as follows Figure 1 The current-voltage characteristics diagram shown.

[0075] However, as the working time of the fuel cell increases, its IV curve is not static. During operation, the fuel cell may experience a series of operating conditions such as dynamic load change, material starvation, dry-wet alternation, membrane dry-water flooding, etc., which may lead to irreversible attenuation of the catalyst, catalyst carbon carrier, diffusion layer, proton exchange membrane, etc., so that the voltage at each current point will drop to varying degrees, which is manifested as a drop in the IV curve. Figure 3 As shown in the figure, after the fuel cell has been working for different lengths of time (i.e. 0h, 100h, 200h, 280h, 370h), the IV curve corresponding to the fuel cell shows the relationship between the corresponding single cell voltage and current when the fuel cell is working for different lengths of time. Since the IV curve is the most direct representation of the output performance of the fuel cell, the decline of the IV curve can intuitively show the degree of fuel cell performance attenuation, that is, the health status of the fuel cell.

[0076] However, during the operation of the vehicle power system, the operating current of the fuel cell depends on the output power of the fuel cell, and the output power of the fuel cell depends on the power demand of the vehicle and the energy management strategy allocation method. Therefore, it is impossible to directly control the operating current of the fuel cell on the vehicle side to obtain the steady-state voltage at each current point within the entire current operating range, so as to obtain the IV curve corresponding to the fuel cell under different conditions. Even if the function of scanning at set current points is implemented in the FCCU, there will be the following disadvantages: the output power of the fuel cell is not controlled by the vehicle VCU, and the output power of the fuel cell has nowhere to be absorbed during the scanning of the IV curve, which may cause the power battery to overcharge; the user can sense that the fuel cell is in the process of scanning the IV curve through the senses, which is not conducive to the user's non-sensory experience.

[0077] Therefore, in order to accurately estimate the performance (i.e., health status) of the fuel cell when the fuel cell is operated in a power closed-loop mode, the technical problems such as the deviation of the fuel cell attenuation under the actual vehicle working condition and the specific test working condition, the voltage attenuation under a specific current cannot represent the macro voltage loss under different currents, and the fuel cell operating current cannot be directly controlled in the power closed-loop mode to scan and obtain the IV curve are solved. The present application provides a fuel cell performance estimation method for use in a power closed-loop mode, which specifically uses the historical operation data of the fuel cell stored during the driving of the actual vehicle to obtain the average IV curve corresponding to the fuel cell within a certain time window without sensing, and quantifies the health status of the fuel cell by the relative change degree of the IV curve, thereby obtaining the IV curve changes at different operating time points to characterize the macro voltage attenuation of the fuel cell within the full current range.

[0078] The fuel cell performance determination method provided in the embodiment of the present application can be applied to the fuel cell performance determination system. Figure 4 FIG. 1 shows a schematic diagram of a fuel cell performance determination system. Figure 4 As shown, the fuel cell performance determination system 40 includes: an electronic device 41 and a fuel cell 42 .

[0079] The electronic device 41 may acquire multiple sets of operating data of the fuel cell 42 , and determine current performance information of the fuel cell 42 based on the multiple sets of operating data.

[0080] The electronic device 41 can determine a first difference between current performance information and first performance information, and a second difference between the first performance information and second performance information. The first performance information is the performance information when the fuel cell 42 is not attenuated, and the second performance information is the performance information when the attenuation degree of the fuel cell 42 is a preset attenuation degree.

[0081] The electronic device 41 may determine the current attenuation degree of the fuel cell 42 based on the first difference amount and the second difference amount, and the attenuation degree of the fuel cell 42 is used to evaluate the performance of the fuel cell 42 .

[0082] In some embodiments, the fuel cell performance determination system 40 may include a vehicle and a cloud server, wherein the vehicle includes an electronic device 41 and a fuel cell 42 .

[0083] The vehicle can obtain multiple sets of operating data of the fuel cell 42 and send the multiple sets of operating data to the cloud server.

[0084] The cloud server may determine current performance information of the fuel cell 42 based on multiple sets of operating data.

[0085] The cloud server can determine a first difference between the current performance information and the first performance information, and a second difference between the first performance information and the second performance information. The first performance information is the performance information when the fuel cell 42 is not attenuated, and the second performance information is the performance information when the attenuation degree of the fuel cell 42 is a preset attenuation degree.

[0086] The cloud server may determine the current attenuation degree of the fuel cell 42 based on the first difference amount and the second difference amount, and the attenuation degree of the fuel cell 42 is used to evaluate the performance of the fuel cell 42 .

[0087] It can be understood that the data processing process provided in the embodiment of the present application can be executed on the vehicle or on the cloud server, and the present application does not limit it.

[0088] It should be noted that a vehicle including a fuel cell may also include a VCU with energy management and control capabilities, and a vehicle-side data transmission repeater or relay device capable of data transmission and communication with a cloud database. The vehicle can be connected to a cloud server with data reception, transmission, storage and computing capabilities, and relevant data services can be implemented through the cloud server. In addition, the CAN communication protocol between DCDC and FCCU can be configured to ensure that DCDC can receive the DCDC input terminal current request value signal issued by FCCU, and at the same time, FCCU can receive the DCDC output terminal current and voltage actual value signal issued by DCDC; and complete the configuration of the data transmission communication protocol of DCDC, FCCU, VCU, data transmission repeater or relay device, cloud server, and terminal equipment to ensure normal data flow transmission.

[0089] For ease of understanding, the fuel cell performance determination method provided in the present application is specifically introduced below with reference to the accompanying drawings.

[0090] Figure 5 is a flow chart of a method for determining fuel cell performance according to an exemplary embodiment, which is applied to an electronic device, which may be an electronic device on a vehicle or a cloud server, such as Figure 5 As shown, the method includes the following S501-S504:

[0091] S501, obtaining multiple groups of operation data of a fuel cell.

[0092] The multiple groups of operating data are operating data of the fuel cell within a target time period. The fuel cell includes a stack. Each group of operating data in the multiple groups of operating data includes: net output power, stack current, and stack voltage.

[0093] Optionally, the electronic device used in the embodiment of the present application may be a VCU in a vehicle or a cloud server, which is not specifically limited in the present application. The embodiment of the present application is illustratively described using a cloud server as an example.

[0094] Specifically, when the vehicle is driving normally and the fuel cell is operating normally, the vehicle can transmit the operating data of the fuel cell to the cloud server in real time. After receiving the operating data of the fuel cell, the cloud server can calculate the performance curve of the fuel cell in a certain period of time, and estimate the current attenuation degree of the fuel cell based on the obtained performance curve, also known as the target performance parameter SOH. fc (i.e. health status value).

[0095] Optionally, after the system is started, the cloud server can detect in real time whether a computing enable signal (i.e., an instruction to determine the target performance parameter of the fuel cell) is received. If a computing enable signal is received, the performance of the fuel cell in the target time period (e.g., [t 0 -b,t 0 ]) within multiple sets of operating data (i.e. net output power P fc 、Stack current I in , Stack voltage U in ).

[0096] S502: Determine current performance information of the fuel cell based on multiple sets of operation data.

[0097] Optionally, the performance information may be represented by a polarization curve or an impedance curve. The polarization curve is used to represent the relationship between voltage and current, and the impedance curve is used to represent the relationship between impedance and current.

[0098] In some embodiments, current performance information of the fuel cell may be represented by a target performance curve, first performance information may be represented by a first performance curve, and second performance information may be represented by a second performance curve.

[0099] Optionally, based on multiple sets of operating data, a target performance curve corresponding to the current performance information of the fuel cell may be determined in a preset coordinate system.

[0100] Optionally, based on the stack current and stack voltage included in each set of operating data, the coordinate points corresponding to each set of operating data can be determined in a preset coordinate system, thereby determining the target performance curve corresponding to the fuel cell based on the coordinate points corresponding to each set of operating data.

[0101] It should be noted that the horizontal axis of the preset coordinate system is used to indicate the current value, and the vertical axis is used to indicate the voltage value.

[0102] In some embodiments, the fuel cell also includes a DCDC converter, and the fuel cell corresponds to a fuel cell control unit. A data transmission communication protocol is configured between the DCDC converter and the fuel cell control unit, and the data transmission communication protocol is used to realize data transmission between the DCDC converter and the fuel cell control unit.

[0103] In an embodiment of the present application, the present application can configure a data transmission communication protocol between the DCDC converter and the fuel cell control unit, thereby ensuring data transmission between the DCDC converter and the fuel cell control unit and improving the operating state of the fuel cell.

[0104] S503: Determine a first difference between the current performance information and the first performance information, and a second difference between the first performance information and the second performance information.

[0105] The first performance information is the performance information when the fuel cell is not attenuated, and the second performance information is the performance information when the attenuation degree of the fuel cell is a preset attenuation degree.

[0106] It should be noted that the non-attenuation of the fuel cell can be understood as the fuel cell being a brand new battery with an attenuation degree of 0 (i.e. a battery just manufactured, the health status can be represented as 100); the attenuation degree of the fuel cell being a preset attenuation degree can be understood as the fuel cell having been used to the maximum extent and needs to be scrapped. The preset attenuation degree can be 50%, i.e. the performance of the fuel cell has decayed by 50% (i.e. the health status can be represented as 50), or the preset attenuation degree can be 40%, i.e. the performance of the fuel cell has decayed by 40% (i.e. the health status can be represented as 60).

[0107] In some embodiments, determining a first difference between current performance information and first performance information, and a second difference between the first performance information and second performance information may specifically include: determining an area of ​​a first closed region formed by a target performance curve and the first performance curve, and an area of ​​a second closed region formed by the first performance curve and the second performance curve, the area of ​​the first closed region being used to indicate the first difference, and the area of ​​the second closed region being used to indicate the second difference.

[0108] It should be noted that the first performance curve can also be understood as the performance curve corresponding to when the performance parameter of the fuel cell is the first preset parameter, and the second performance curve can also be understood as the performance curve corresponding to when the performance parameter of the fuel cell is the second preset parameter. The performance parameters are used to indicate the attenuation degree of the fuel cell, and the first preset parameter is greater than the second preset parameter.

[0109] In the embodiment of the present application, the present application can represent the performance information through the performance curve. Therefore, when determining the difference between different performance information, the corresponding difference can be represented based on the area of ​​the closed area formed between the corresponding performance curves. In this way, the corresponding difference can be determined intuitively and accurately through the area of ​​the closed area formed between the curves, thereby improving the accuracy of the subsequent determination of the fuel cell performance.

[0110] S504: Determine the current attenuation degree of the fuel cell based on the first difference and the second difference.

[0111] Among them, the attenuation degree of the fuel cell is used to evaluate the performance of the fuel cell.

[0112] Optionally, the current attenuation degree of the fuel cell (ie, the target performance parameter) may be determined based on the area of ​​the first enclosed region and the area of ​​the second enclosed region.

[0113] Optionally, the preset coordinate system also includes a performance curve corresponding to when the performance parameter of the fuel cell is the highest (i.e., the first preset parameter) (which may be referred to as the BoL initial curve), and a performance curve corresponding to when the performance parameter of the fuel cell is the lowest (i.e., the second preset parameter) (which may be referred to as the EoL end-of-life curve).

[0114] It should be noted that when the performance parameter of the fuel cell is the highest, it can be understood that the fuel cell has not been used after production (i.e., the working time of the fuel cell is 0h); when the performance parameter of the fuel cell is the lowest, it can be understood that after the fuel cell is produced, the performance decays to a certain proportion (e.g., 60%) that has not been used. For example, when the performance parameter of the fuel cell is the highest, the corresponding first preset parameter is 100%, and when the performance parameter of the fuel cell is the lowest, the corresponding second preset parameter is 60%.

[0115] In this way, the area S of the first closed region formed by the target performance curve and the first performance curve can be calculated: BoL～t0 , and the area S of the second closed area formed by the first performance curve and the second performance curve BoL～EoL And the target performance parameter SOH of the fuel cell is calculated by formula 2 fc .

[0116]

[0117] Furthermore, the target performance parameter SOH of the fuel cell can be updated fc And maintain, and when it is determined that the system shutdown signal is received, stop the program running.

[0118] Optionally, the target performance parameter SOH of the fuel cell fcIt can also be sent to the vehicle power system control layer (i.e., VCU vehicle controller) and fuel cell engine control layer (i.e., FCCU) at the vehicle end along the data link of the cloud server, data transmission repeater, VCU vehicle controller, and FCCU. The VCU vehicle controller and FCCU can respectively fc Realize more complex control functions.

[0119] For example, the VCU vehicle controller can be based on the target performance parameter SOH of the fuel cell. fc , adjust the output power request value of the fuel cell, so as to timely adjust the workload of the fuel cell after the fuel cell is attenuated or in a bad state to avoid accelerated attenuation; FCCU can adjust the output power request value of the fuel cell according to the target performance parameter SOH of the fuel cell fc , adjust the power load rate of the fuel cell and the working status of the air, hydrogen, water and other subsystems, so as to timely adjust the fuel cell operating conditions or operating modes after the fuel cell is attenuated or in a bad state, thereby extending the remaining service life.

[0120] Optionally, the target performance parameter SOH of the fuel cell can also be transmitted via the data network. fc The data is transmitted to the user's various terminal devices, and the user can view the current health status of the vehicle's fuel cell through the application software on the terminal device.

[0121] In an embodiment of the present application, the present application can determine the current performance information of the fuel cell based on multiple groups of operating data of the fuel cell. Then, in combination with the predetermined first performance information when the fuel cell is not attenuated, and the second performance information when the attenuation degree of the fuel cell is a preset attenuation degree, the first difference between the current performance information and the first performance information, and the second difference between the first performance information and the second performance information are determined. Thus, based on the first difference and the second difference, the current attenuation degree of the fuel cell is determined to evaluate the performance of the fuel cell. Through the above method, since the fuel cell has different performance information when it produces different degrees of attenuation, and the performance information of the fuel cell can be accurately determined based on the operating data of the fuel cell. Therefore, the current attenuation degree of the fuel cell can be determined based on the difference between the current performance information of the fuel cell, the first performance information, and the second performance information, so that the accuracy of determining the performance of the fuel cell can be improved.

[0122] In some embodiments, to determine the current performance information of the fuel cell, such as Figure 6 As shown, in a fuel cell performance determination method provided in an embodiment of the present application, the above step S502 may specifically include S601-S603:

[0123] S601. Acquire multiple preset power values, and determine at least one set of operating data corresponding to each of the multiple preset power values ​​from multiple sets of operating data.

[0124] In the embodiment of the present application, multiple preset power values ​​P can be pre-set. 1 ,p 2 ,p 3 ,…,p n ], and successively determine p from multiple sets of running data j Corresponding to at least one set of operating data, j=1, 2, 3, ..., n.

[0125] Optionally, after the vehicle starts the fuel cell operation, the VCU can complete the vehicle power requirement P based on the energy management strategy. veh The distribution between the power battery and the fuel cell is based on the vehicle's required power P veh Allocate the requested power P to the fuel cell req The fuel cell controls the requested current I at the DCDC input req , realize the closed-loop control of the net power of the fuel cell, so that the net output power of the fuel cell P fc Reach the requested power P req .

[0126] Optionally, the vehicle can set the net output power of the fuel cell P fc 、Stack current I in , Stack voltage U in , can be uploaded to the cloud server along the data link of FCCU, VCU, and data transmission repeater.

[0127] In some embodiments, at least one group of operating data corresponding to each preset power value among multiple preset power values ​​is determined from multiple groups of operating data, including: for any preset power value among the multiple preset power values, determining a power interval corresponding to any preset power value; and determining at least one group of operating data in the multiple groups of operating data whose net output power is in the power interval corresponding to any preset power value as at least one group of operating data corresponding to any preset power value.

[0128] Optionally, the net output power P included in each set of operating data may be fc The value of p j ±1%p j Net output power P within the range fc At least one set of corresponding operating data is recorded in time sequence, and the corresponding battery stack current I in , Stack voltage U in .

[0129] In the embodiment of the present application, the present application can first determine the power interval corresponding to each preset power value, and then determine at least one set of operating data corresponding to each preset power value based on the power interval of the net output power included in each set of operating data in the multiple sets of operating data. In this way, at least one set of operating data corresponding to each preset power value can be accurately determined, thereby improving the accuracy of the subsequent determination of the target performance curve corresponding to the fuel cell.

[0130] S602. For any preset power value among the plurality of preset power values, based on the coordinate points of at least one set of operating data corresponding to any preset power value in the preset coordinate system, determine a central coordinate point corresponding to any preset power value in the preset coordinate system.

[0131] Optionally, a coordinate point cluster of at least one set of operating data corresponding to each preset power value may be determined in a preset coordinate system, thereby determining a central coordinate point c corresponding to each preset power value based on the coordinate point cluster of at least one set of operating data corresponding to each preset power value. j In this way, the center coordinate point corresponding to each preset power value in the plurality of preset power values ​​can be determined respectively.

[0132] S603, sequentially connecting the central coordinate points corresponding to each preset power value in the preset coordinate system of the plurality of preset power values ​​to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve.

[0133] Optionally, the central coordinate point corresponding to each preset power value in the preset coordinate system may be fitted to obtain [t 0 -b,t 0 ] time period, the target performance curve corresponding to the fuel cell.

[0134] Specifically, based on the horizontal coordinate (i.e., current value) of the center coordinate point corresponding to each preset power value in the preset coordinate system, the center coordinate points corresponding to each preset power value in the preset coordinate system can be connected in order from small to large according to the value of the horizontal coordinate to obtain the target performance curve corresponding to the fuel cell.

[0135] In a specific embodiment, Figure 7 As shown, a time series data diagram of a parameter based on time variation shows the net output power P of the fuel cell fc 、Stack current I in , Stack voltage U in , based on the time series data graph corresponding to the change in time, based on Figure 7 The timing data diagram shown in the figure shows that the horizontal axis is the stack current I in , the left ordinate is the stack voltage U in, the right vertical axis is the net output power P fc , we can get Figure 8 The coordinate point map shown in Figure 1 is shown in Figure 1. Figure 8 From the coordinate point diagram shown, it can be seen that as the stack current value increases, the stack voltage value presents a nonlinear downward trend, and the net output power presents a nonlinear upward trend.

[0136] Further, based on Figure 7 The net output power P shown fc 、Stack current I in , Stack voltage U in The timing data is combined with a plurality of preset power values ​​P=[p 1 ,p 2 ,p 3 ,p 4 ,p 5 ,p 6 ]. For the net output power P fc 、Stack current I in , Stack voltage U in Filter, the filtered values ​​are in p j ±1%p j The net output power in the interval is recorded, and the corresponding stack current and stack voltage are recorded in time series, such as Fig. 9 As shown, the net output power P after screening is obtained fc 、Stack current I in , Stack voltage U in Then based on Fig. 9 The screened timing data diagram shown in the figure shows that the horizontal axis is the stack current I in , the left ordinate is the stack voltage U in , the right vertical axis is the net output power P fc , we can get Fig.10 The coordinate point map after filtering is shown. Fig.10 From the filtered coordinate point diagram shown, it can be seen that as the stack current value increases, the stack voltage and net output power present multiple coordinate point clusters in the coordinate system.

[0137] For example, Fig.11 As shown in FIG. 1 , a schematic diagram of a coordinate point cluster is shown, taking a coordinate point cluster of 55 kW and equal power in the range of 540A-620A as an example. Fig.10The 55kW equal power coordinate point cluster in the range of 540A-620A is focused and amplified, and then the geometric center (i.e., the center coordinate point) of the coordinate point cluster is solved, and the current value and voltage value corresponding to the geometric center of the coordinate point cluster are used as the average stack current and average stack voltage when the fuel cell works at 55kW equal power. In this way, based on this method, the geometric center of the coordinate point cluster corresponding to each preset power value can be determined. Further, as Fig.12 As shown, by performing nonlinear fitting on the geometric centers corresponding to different preset power values, the target performance curve corresponding to the fuel cell is obtained.

[0138] Further, if Fig.13 As shown in the schematic diagram of the target performance curve corresponding to the fuel cell, the preset coordinate system includes the target performance curve, the first performance curve (i.e., BoL), and the second performance curve (i.e., EoL), and the area S of the first closed area formed by the target performance curve and the first performance curve can be calculated. BoL～t0 , and the area S of the second closed area formed by the first performance curve and the second performance curve BoL～EoL And the target performance parameter SOH of the fuel cell is calculated by the above formula 2 fc .

[0139] This application uploads and stores the net output power, stack current and stack voltage of the fuel cell to the cloud server during the driving of the actual vehicle. By finding and fitting the two-dimensional plane geometric center of the current and voltage data corresponding to each preset power value in the coordinate system, the target performance curve of the fuel cell can be obtained at any time, and by comparing the geometric area of ​​the target performance curve relative to the first performance curve, and the geometric area of ​​the first performance curve relative to the second performance curve, the current performance attenuation of the fuel cell can be intuitively represented. And the percentage of these two geometric areas is used as a quantitative indicator of the health state (i.e., the target performance parameter). This application can better characterize the macroscopic attenuation of the fuel cell voltage within the full current range, and more reasonably quantify the health state of the fuel cell; using the historical operation data of the whole vehicle stored in the cloud, there is no need to disassemble the system, and there is no need to scan according to the set current point regularly. The whole process can be completed under the premise that the user is completely unaware; there is no need to specify the working conditions, and the results obtained are more in line with the actual attenuation of the fuel cell under complex and changeable vehicle conditions.

[0140] In an embodiment of the present application, the present application can determine at least one set of operating data corresponding to each preset power value from multiple sets of operating data based on multiple preset power values. Then, based on the coordinate points of at least one set of operating data corresponding to each preset power value in the preset coordinate system, determine the center coordinate point corresponding to each preset power value in the preset coordinate system. In this way, based on the connection line of the center coordinate point corresponding to each preset power value in the preset coordinate system among the multiple preset power values, the target performance curve corresponding to the fuel cell can be determined. Through the above method, the corresponding target performance curve can be accurately determined according to the distribution positions of multiple sets of operating data in the preset coordinate system, thereby improving the accuracy of determining the performance curve.

[0141] In some embodiments, each set of operating data in the multiple sets of operating data further includes: a stack current and a stack voltage, and the fuel cell further includes an auxiliary module, and the auxiliary module includes at least one of the following: a hydrothermal control module, a fuel supply module, and an air supply module. In order to obtain multiple sets of operating data of the fuel cell, such as Fig.14 As shown, in a fuel cell performance determination method provided in an embodiment of the present application, the above step S501 may specifically include S1401-S1403:

[0142] S1401 : Determine error power based on the requested power corresponding to the fuel cell at any moment and the net output power of the fuel cell determined at the last moment before any moment.

[0143] S1402. Determine the stack current, stack voltage and stack power corresponding to the fuel cell at any time based on the error power.

[0144] In some embodiments, the fuel cell also includes a DCDC converter, and the stack is connected to the input end of the DCDC converter; the stack current, stack voltage and stack power corresponding to the fuel cell at any time are determined based on the error power, including: determining the input current of the DCDC converter at any time based on the error power; adjusting the current value of the input end of the DCDC converter based on the input current of the DCDC converter, and determining the stack current, stack voltage and stack power corresponding to the fuel cell at any time.

[0145] Optional, such as Fig.15 As shown, the VCU determines the required power P of the vehicle veh Then, the requested power P allocated to the fuel cell is determined based on the energy management strategy. req Then, the FCCU can calculate the requested power P of the fuel cell at any time. req and the net output power P of the fuel cell determined at the previous moment at any moment fc , calculate the error power e = P req -P fcThen, based on the net output power closed-loop control strategy, according to the error power e, the fuel cell stack output current request value, that is, the current request value I at the DCDC input end, can be calculated. req ; Then, DCDC calculates the input current request value I req Adjust the DCDC input current to change the stack current I in , and causes the stack voltage U in (refers to the average cell voltage) changes, so that the stack power P stk Produce changes.

[0146] In the embodiment of the present application, the present application can determine the input current of the DCDC converter at any time based on the error power, thereby adjusting the current value of the input end of the DCDC converter, and the change of the current value of the input end of the DCDC converter can cause the change of the stack current, stack voltage and stack power, so it is necessary to determine the stack current, stack voltage and stack power corresponding to the fuel cell at any time. In this way, the stack current, stack voltage and stack power corresponding to the fuel cell can be accurately determined.

[0147] S1403. Determine the net output power of the fuel cell at any time based on the stack power and the power consumption of the auxiliary module.

[0148] Optional, such as Fig.15 As shown, the FCCU can determine the corresponding operating condition request value of the stack (i.e., the control parameter of the auxiliary module) based on the DCDC input current table, determine the control parameters of the auxiliary modules (water heat control module, fuel supply module, air supply module, etc.), and meet the various operating conditions of the stack through control. In this case, the control process of the auxiliary module will cause each subsystem to consume a part of the output power of the stack, so it is necessary to determine the power consumption P of the auxiliary module. bop , as shown in Formula 3.

[0149] P bop =P ca +P an +P tm Formula 3

[0150] Among them, P ca The power consumption of the accessories of the air supply module, P an The power consumption of the accessories of the fuel supply module, P tm Power consumed by accessories for the water thermal control module.

[0151] Furthermore, during the operation of the fuel cell, on the one hand, the fuel cell generates electrical power through the stack, and on the other hand, the subsystem accessories (i.e., auxiliary modules) will continue to consume the electrical energy generated by the stack, so the net output power P of the fuel cell is fcIt can be determined according to formula 4.

[0152] P fc =P stk *η dcdc -P bop Formula 4

[0153] Among them, η dcdc Refers to the conversion efficiency of DCDC, which is usually a function of the boost ratio and input current.

[0154] In this way, the stack power P can be determined stk Depends on the stack current I in , the power consumption of the auxiliary module P bop It is also related to the DCDC input current of the operating condition request value corresponding to the battery stack, that is, the power consumption P of the auxiliary module bop and the stack current I in Therefore, the net output power P of the fuel cell is fc It is about the stack current I in As the fuel cell decays during use and the operating conditions deviate unfavorably, P fc About I in The functional relationship will change, because the polarization performance of the battery stack will decrease after attenuation, and the battery stack voltage U in To maintain the same net output power before attenuation, the stack current I in Will increase.

[0155] If the stack current I in is the horizontal axis, the stack voltage U in As the vertical coordinate, establish a two-dimensional coordinate system, such as Fig.16 As shown, during the actual operation of the fuel cell, the same net output power P fc Will correspond to several a i (I in ,U in ) coordinate point (a 1 -a i ), forming a cluster of coordinate points of equal power. The gradual change process of these coordinate points can reflect the attenuation of fuel cell performance or the deviation of the health of operation. The geometric center c (i.e., the center coordinate point) corresponding to the cluster of coordinate points of equal power reflects the average performance of the fuel cell system after attenuation at a certain power. According to this principle, the geometric center corresponding to the cluster of coordinate points of equal power with different power values ​​(i.e., multiple preset power values) is determined, and then multiple geometric centers are fitted and connected to obtain the performance curve representing the fuel cell after attenuation.

[0156] In an embodiment of the present application, the present application can determine the error power based on the requested power corresponding to the fuel cell at any time, and the net output power of the fuel cell determined at the previous moment at any time. Then, the stack current, stack voltage, and stack power corresponding to the fuel cell at any time are determined based on the error power. Further, based on the stack power and the power consumption of the auxiliary module, the net output power of the fuel cell at any time can be determined. In this way, a specific method for determining the stack current, stack voltage, stack power, and net output power at each moment is given, which can improve the accuracy of determining the operating data of the fuel cell.

[0157] In some embodiments, the method also includes: adjusting the requested power corresponding to the fuel cell based on the current attenuation degree of the fuel cell, the adjusted requested power corresponding to the fuel cell is inversely proportional to the current attenuation degree of the fuel cell; and determining the operating parameters of the fuel cell based on the adjusted requested power corresponding to the fuel cell.

[0158] It is understood that the VCU can be based on the target performance parameter SOH of the fuel cell fc , adjust the vehicle's required power P veh The way to allocate to the fuel cell is to adjust the requested power P allocated to the fuel cell. req , so that the fuel cell can reasonably respond to the required power of the whole vehicle according to its own health status, and delay the life attenuation of the fuel cell.

[0159] In the embodiment of the present application, the present application can further adjust the requested power corresponding to the fuel cell based on the determined current attenuation degree of the fuel cell, thereby determining the operating parameters of the fuel cell based on the adjusted requested power corresponding to the fuel cell. In this way, the operating parameters of the fuel cell can be further optimized to increase the service life of the fuel cell.

[0160] In some embodiments, the method further includes: adjusting the operating parameters of the auxiliary module based on the current attenuation level of the fuel cell, and the adjusted operating parameters of the auxiliary module are used to optimize the performance of the fuel cell; and determining the power consumption of the auxiliary module based on the adjusted operating parameters of the auxiliary module.

[0161] It is understood that the FCCU can be based on the target performance parameter SOH of the fuel cell. fc , adjust the operation of auxiliary modules such as the water heat control module, fuel supply module, and air supply module included in the fuel cell, help the fuel cell operate under operating conditions that are more conducive to extending its life, and optimize the performance of the fuel cell. And in this state, determine the power consumption of the auxiliary modules more accurately.

[0162] Optionally, the target performance parameter SOH of the fuel cell determined above can also be fcSent to the user's terminal device, which includes but is not limited to mobile phones, tablets, car computers, etc.

[0163] In the embodiment of the present application, the present application can further adjust the requested power corresponding to the fuel cell based on the determined current attenuation degree of the fuel cell, thereby determining the operating parameters of the fuel cell based on the adjusted requested power corresponding to the fuel cell. In this way, the operating parameters of the fuel cell can be further optimized to increase the service life of the fuel cell.

[0164] In a specific implementation, Fig.17 As shown in the figure, taking the electronic device as a cloud server as an example, the VCU in the vehicle is based on the required power P of the whole vehicle. veh , determine the requested power P allocated to the fuel cell req Afterwards, the VCU allocates the requested power P to the fuel cell. req Sent to FCCU. FCCU based on the requested power P allocated to the fuel cell req and auxiliary module power consumption (including P ca , P an , P tm ), determine the operating data of the fuel cell (net output power P fc 、Stack current I in , Stack voltage U in ). The vehicle can gradually send the fuel cell operation data to the cloud server through the FCCU, VCU, and data transmission repeater. The cloud server then determines the target performance parameter SOH of the fuel cell based on the fuel cell operation data. fc , and sent to vehicles and user devices.

[0165] More specifically, the transmission link of the fuel cell engine operation data is the fuel cell engine controller FCCU, the vehicle controller VCU, the data transmission repeater, and the cloud database. The cloud data calculation module calculates the fuel cell engine health status value SOH based on the fuel cell engine operation data. fc , and transmitted back to the vehicle controller VCU and fuel cell engine controller FCCU on the vehicle side through the data transmission link from the cloud database.

[0166] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to achieve the above functions, the fuel cell performance determination device or electronic device includes a hardware structure and / or software module corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0167] The embodiments of the present application can divide the functional modules of the fuel cell performance determination device or electronic device according to the above method. For example, the fuel cell performance determination device or electronic device may include various functional modules corresponding to the various functional divisions, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0168] Fig.18 FIG. 1 is a block diagram of a fuel cell performance determination device according to an exemplary embodiment. Fig.18 The fuel cell performance determination device 1800 includes: an acquisition module 1801 and a processing module 1802 .

[0169] The acquisition module 1801 is used to acquire multiple sets of operating data of the fuel cell; the processing module 1802 is used to determine the current performance information of the fuel cell based on the multiple sets of operating data; the processing module 1802 is also used to determine a first difference between the current performance information and the first performance information, and a second difference between the first performance information and the second performance information, the first performance information is the performance information when the fuel cell is not attenuated, and the second performance information is the performance information when the attenuation degree of the fuel cell is a preset attenuation degree; the processing module 1802 is also used to determine the current attenuation degree of the fuel cell based on the first difference and the second difference, and the attenuation degree of the fuel cell is used to evaluate the performance of the fuel cell.

[0170] In one possible implementation, the current performance information of the fuel cell is represented by a target performance curve, the first performance information is represented by a first performance curve, and the second performance information is represented by a second performance curve; the processing module 1802 is specifically used to determine the area of ​​a first closed region formed by the target performance curve and the first performance curve, and the area of ​​a second closed region formed by the first performance curve and the second performance curve, the area of ​​the first closed region being used to indicate a first difference amount, and the area of ​​the second closed region being used to indicate a second difference amount.

[0171] In one possible implementation, the acquisition module 1801 is also used to acquire multiple preset power values, and determine at least one group of operating data corresponding to each of the multiple preset power values ​​from multiple groups of operating data; the processing module 1802 is specifically used to determine, for any one of the multiple preset power values, a center coordinate point corresponding to any one of the multiple preset power values ​​in the preset coordinate system based on the coordinate point of at least one group of operating data corresponding to any one of the preset power values ​​in the preset coordinate system; the processing module 1802 is specifically used to connect the center coordinate points corresponding to each of the multiple preset power values ​​in the preset coordinate system in sequence to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve.

[0172] In one possible implementation, each group of operating data in the multiple groups of operating data includes: net output power; a processing module 1802, which is specifically used to determine, for any one of a plurality of preset power values, a power interval corresponding to any preset power value; the processing module 1802, which is specifically used to determine at least one group of operating data in the multiple groups of operating data, whose net output power is in the power interval corresponding to any preset power value, as at least one group of operating data corresponding to any preset power value.

[0173] In a possible implementation, each group of operating data in the multiple groups of operating data also includes: a stack current and a stack voltage, and the fuel cell also includes an auxiliary module, and the auxiliary module includes at least one of the following: a hydrothermal control module, a fuel supply module, and an air supply module; the processing module 1802 is also used to determine the error power based on the requested power corresponding to the fuel cell at any moment, and the net output power of the fuel cell determined at the previous moment at any moment; the processing module 1802 is also used to determine the stack current, stack voltage and stack power corresponding to the fuel cell at any moment based on the error power; the processing module 1802 is also used to determine the net output power of the fuel cell at any moment based on the stack power and the power consumption of the auxiliary module.

[0174] In one possible implementation, the fuel cell also includes a DCDC converter, and the stack is connected to the input end of the DCDC converter; the processing module 1802 is specifically used to determine the input current of the DCDC converter at any time based on the error power; the processing module 1802 is specifically used to adjust the current value of the input end of the DCDC converter based on the input current of the DCDC converter, and determine the stack current, stack voltage and stack power corresponding to the fuel cell at any time.

[0175] In one possible implementation, the processing module 1802 is also used to adjust the operating parameters of the auxiliary module based on the current attenuation degree of the fuel cell, and the adjusted operating parameters of the auxiliary module are used to optimize the performance of the fuel cell; the processing module 1802 is also used to determine the power consumption of the auxiliary module based on the adjusted operating parameters of the auxiliary module.

[0176] In one possible implementation, the processing module 1802 is also used to adjust the requested power corresponding to the fuel cell based on the current attenuation degree of the fuel cell, and the adjusted requested power corresponding to the fuel cell is inversely proportional to the current attenuation degree of the fuel cell; the processing module 1802 is also used to determine the operating parameters of the fuel cell based on the adjusted requested power corresponding to the fuel cell.

[0177] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0178] Fig.19 FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Fig.19 As shown, the electronic device 1900 includes but is not limited to: a processor 1901 and a memory 1902 .

[0179] The memory 1902 is used to store executable instructions of the processor 1901. It can be understood that the processor 1901 is configured to execute instructions to implement the fuel cell performance determination method in the above embodiment.

[0180] It should be noted that those skilled in the art can understand that Fig.19 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and the electronic device may include Fig.19 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0181] The processor 1901 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 1902, and calling data stored in the memory 1902, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 1901 may include one or more processing units. Optionally, the processor 1901 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 1901.

[0182] The memory 1902 may be used to store software programs and various data. The memory 1902 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one functional module (such as a processing module, etc.), etc. In addition, the memory 1902 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0183] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 1902 including instructions, and the above instructions can be executed by the processor 1901 of the electronic device 1900 to implement the fuel cell performance determination method in the above embodiment.

[0184] In actual implementation, Fig.18 The functions of the acquisition module 1801 and the processing module 1802 in Fig.19 The processor 1901 in the embodiment calls the computer program stored in the memory 1902. The specific execution process can refer to the description of the fuel cell performance determination method in the above embodiment, which will not be repeated here.

[0185] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0186] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, which can be executed by the processor 1901 of the electronic device 1900 to complete the fuel cell performance determination method in the above embodiment.

[0187] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the electronic device, the various processes of the above-mentioned fuel cell performance determination method embodiment are implemented, and the same technical effect as the above-mentioned fuel cell performance determination method can be achieved. To avoid repetition, they will not be repeated here.

[0188] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0189] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0190] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0191] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0192] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of the methods of each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, disks, or optical disks.

[0193] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining fuel cell performance, characterized in that: The method comprises: Acquire multiple groups of operating data of fuel cells; determining current performance information of the fuel cell based on the plurality of sets of operating data; Determine an area of ​​a first closed area formed by a target performance curve and a first performance curve, and an area of ​​a second closed area formed by the first performance curve and a second performance curve, the area of ​​the first closed area is used to indicate a first difference amount, and the area of ​​the second closed area is used to indicate a second difference amount, the target performance curve represents current performance information of the fuel cell, the first performance curve represents first performance information, and the second performance curve represents second performance information, the first performance information is performance information when the fuel cell is not attenuated, and the second performance information is performance information when the attenuation degree of the fuel cell is a preset attenuation degree; Based on the first difference and the second difference, a current attenuation degree of the fuel cell is determined, and the attenuation degree of the fuel cell is used to evaluate the performance of the fuel cell.

2. The method according to claim 1, characterized in that Determining current performance information of the fuel cell based on the multiple sets of operating data includes: Acquire a plurality of preset power values, and determine at least one set of operating data corresponding to each of the plurality of preset power values ​​from the plurality of sets of operating data; For any one of the plurality of preset power values, based on a coordinate point of at least one set of operating data corresponding to the any one of the preset power values ​​in a preset coordinate system, determining a central coordinate point corresponding to the any one of the preset power values ​​in the preset coordinate system; The central coordinate points corresponding to each preset power value of the plurality of preset power values ​​in the preset coordinate system are sequentially connected to obtain a target performance curve, so as to represent the current performance information of the fuel cell through the target performance curve.

3. The method according to claim 2, characterized in that Each set of operating data in the plurality of sets of operating data includes: net output power; The step of determining, from the plurality of sets of operating data, at least one set of operating data corresponding to each of the plurality of preset power values ​​comprises: For any one of the plurality of preset power values, determining a power interval corresponding to the any one of the preset power values; Among the multiple groups of operating data, at least one group of operating data whose net output power is within the power interval corresponding to any one of the preset power values ​​is determined as at least one group of operating data corresponding to any one of the preset power values.

4. The method according to any one of claims 1 to 3, characterized in that Each set of operating data in the plurality of sets of operating data further includes: a stack current and a stack voltage; the fuel cell further includes an auxiliary module, the auxiliary module including at least one of the following: a hydrothermal control module, a fuel supply module, and an air supply module; The obtaining of multiple groups of operating data of the fuel cell comprises: Determine an error power based on a requested power corresponding to the fuel cell at any time and a net output power of the fuel cell determined at a previous time of the any time; Determine the stack current, the stack voltage, and the stack power corresponding to the fuel cell at any time based on the error power; The net output power of the fuel cell at any time is determined based on the stack power and the power consumption of the auxiliary module.

5. The method according to claim 4, characterized in that The fuel cell further includes a DCDC converter, and the fuel cell stack is connected to an input end of the DCDC converter; The determining the stack current, the stack voltage, and the stack power corresponding to the fuel cell at any time based on the error power includes: Determine the input current of the DCDC converter at any time based on the error power; The current value of the input end of the DCDC converter is adjusted based on the input end current of the DCDC converter to determine the stack current, the stack voltage and the stack power corresponding to the fuel cell at any time.

6. The method according to claim 4, characterized in that The method further comprises: Based on the current attenuation degree of the fuel cell, adjusting the operating parameters of the auxiliary module, wherein the adjusted operating parameters of the auxiliary module are used to optimize the performance of the fuel cell; The power consumption of the auxiliary module is determined based on the adjusted operating parameters of the auxiliary module.

7. The method according to any one of claims 1 to 3, characterized in that The method further comprises: Based on the current attenuation degree of the fuel cell, adjusting the requested power corresponding to the fuel cell, wherein the adjusted requested power corresponding to the fuel cell is inversely proportional to the current attenuation degree of the fuel cell; An operating parameter of the fuel cell is determined based on the adjusted requested power corresponding to the fuel cell.

8. A fuel cell performance determination device, characterized in that: The fuel cell performance determination device comprises: an acquisition module and a processing module; The acquisition module is used to acquire multiple groups of operation data of the fuel cell; The processing module is used to determine current performance information of the fuel cell based on the multiple sets of operating data; The processing module is further used to determine an area of ​​a first closed area formed by a target performance curve and a first performance curve, and an area of ​​a second closed area formed by the first performance curve and a second performance curve, the area of ​​the first closed area is used to indicate a first difference amount, and the area of ​​the second closed area is used to indicate a second difference amount, the target performance curve represents current performance information of the fuel cell, the first performance curve represents first performance information, and the second performance curve represents second performance information, the first performance information is performance information when the fuel cell is not attenuated, and the second performance information is performance information when the attenuation degree of the fuel cell is a preset attenuation degree; The processing module is further used to determine a current attenuation degree of the fuel cell based on the first difference amount and the second difference amount, and the attenuation degree of the fuel cell is used to evaluate the performance of the fuel cell.

9. A fuel cell performance determination system, characterized in that: The fuel cell performance determination system includes a vehicle and a cloud server, and the fuel cell performance determination system is used to implement the method as described in any one of claims 1-7.

10. A vehicle, characterized in that: The vehicle comprises the fuel cell performance determination device according to claim 8, and the vehicle is used to implement the method according to any one of claims 1-7.

11. A cloud server, characterized in that: The cloud server includes the fuel cell performance determination device as described in claim 8, and the cloud server is used to implement the method as described in any one of claims 1-7.

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