Fuel cell stack life control method, device and fuel cell system

Abstract

The present application relates to the field of fuel cell technology, and in particular to a method, device and fuel cell system for controlling the life of a stack, wherein the method comprises: judging whether the stack meets the preset stack life control condition according to at least one of the current voltage, current input pressure, current temperature and current metering ratio of the stack, and if the stack meets the preset stack life control condition, calculating the target output power of the fuel cell system according to the current voltage and the preset current of the stack, and controlling the life of the fuel cell system based on the target output power. Thus, the problems of difficult monitoring and control of fuel cell life decay, low service life caused by stack performance decay, etc. are solved, the accuracy of online monitoring of stack life is greatly improved, and the limit range of real-time stack output power is accurately calculated, thereby effectively extending the service life of the stack.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a method and device for controlling the life of a fuel cell stack and a fuel cell system. Background Art

[0002] The life control of the fuel cell system requires knowing the relationship between the stack output voltage and current, that is, the polarization curve. The appropriate output power of the fuel cell system can be calculated based on the polarization curve of the fuel cell. Since the polarization curve of the fuel cell is nonlinear and is affected by many factors, such as the stack temperature, gas partial pressure, cathode and anode stoichiometric ratio, etc., the polarization curve of the fuel cell is very difficult to determine in real-time operation.

[0003] In addition, the stack will decay over time, and the stack polarization curve will also degrade. The aging stack requires more output current to meet the system's set power requirements. Once the current setting exceeds the fuel cell polarization curve capability, the fuel cell performance decay will be accelerated. Therefore, an adaptive control method based on online monitoring of the fuel cell stack performance and limiting the system output power is particularly important.

[0004] In the related art, the solution for durability testing of the battery stack and system is completed through accelerated durability testing on the material side or the component side, or through offline update control methods after actual road spectrum collection. However, it is difficult for the solution in the related art to take necessary measures to update the strategy of extending durability in real time online according to the actual input conditions of the battery stack. The durability solution has a lag, and it is difficult to solve the reliability problem of online commercial vehicle fuel cells, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a method and device for controlling the life of a fuel cell stack, and a fuel cell system, so as to solve the problems of difficulty in monitoring and controlling the life attenuation of fuel cells for commercial vehicles operated online, and low service life due to the performance attenuation of the fuel cell stack, etc., greatly improves the accuracy of online monitoring of the life of the fuel cell stack, and accurately calculates the limit range of the real-time output power of the fuel cell stack, thereby effectively extending the service life of the fuel cell stack.

[0006] The first embodiment of the present application provides a method for controlling the life of a fuel cell stack, comprising the following steps:

[0007] Obtain the current voltage, current input pressure, current temperature and current stoichiometric ratio of the battery stack;

[0008] Determining whether the fuel cell stack meets a preset fuel cell stack life control condition according to at least one of the current voltage, the current input pressure, the current temperature and the current metering ratio;

[0009] If the fuel cell stack meets the preset fuel cell stack life control condition, the target output power of the fuel cell system is calculated according to the current voltage and the preset current of the fuel cell stack, and the life of the fuel cell system is controlled based on the target output power.

[0010] Optionally, in some embodiments, judging whether the fuel cell stack meets a preset fuel cell stack life control condition according to at least one of the current voltage, the current input pressure, the current temperature and the current metering ratio includes:

[0011] Obtaining a current voltage decay rate according to the current input pressure, the current temperature and the current metering ratio;

[0012] Whether the battery stack meets the preset battery stack life control condition is determined based on the current voltage decay rate and the preset voltage decay rate reference value.

[0013] Optionally, in some embodiments, judging whether the battery stack meets a preset battery stack life control condition according to the current voltage decay rate and a preset voltage decay rate reference value includes:

[0014] Calculating a first difference between a preset voltage and the current voltage, and if the first difference is greater than or equal to a first preset threshold, then calculating a second difference between the first difference and the current voltage decay rate when the current voltage decay rate is less than or equal to a preset voltage decay rate reference value;

[0015] If the second difference is greater than or equal to a second preset threshold, it is determined that the fuel cell stack meets the preset fuel cell stack life control condition.

[0016] Optionally, in some embodiments, after calculating the first difference between the preset voltage and the current voltage, the method further includes:

[0017] If the first difference is greater than or equal to the first preset threshold, and the current voltage decay rate is greater than the preset voltage decay rate reference value, it is determined that the fuel cell stack meets the preset fuel cell stack life control condition.

[0018] Optionally, in some embodiments, before calculating the target output power of the fuel cell system according to the current voltage and the preset current of the fuel cell stack, the method further includes:

[0019] The preset current of the battery stack is determined based on a preset battery stack output interpolation table.

[0020] Optionally, in some embodiments, before determining the preset current of the battery stack based on the preset battery stack output interpolation table, the method further includes:

[0021] Obtaining a polarization curve of the stack in a bench test;

[0022] Based on the polarization curve, determining an output current according to the preset voltage, and obtaining an output power according to the preset voltage and the output current;

[0023] The preset stack output interpolation table is obtained according to the preset voltage, the output current and the output power.

[0024] Optionally, in some embodiments, when the life of the fuel cell system is controlled based on the target output power, the method further includes:

[0025] Obtaining the real-time output voltage and real-time output current of the battery stack;

[0026] updating the polarization curve based on the real-time output voltage and the real-time output current;

[0027] The preset stack output interpolation table is recalculated according to the updated polarization curve.

[0028] Optionally, in some embodiments, before obtaining the current voltage decay rate according to the current input pressure, the current temperature and the current metering ratio, the method further includes:

[0029] Obtain input pressure, temperature and stoichiometric ratio in bench stack accelerated testing;

[0030] The preset voltage decay rate reference value is obtained according to the input pressure, the temperature and the metering ratio in the bench stack accelerated test.

[0031] A second aspect of the present application provides a life control device for a fuel cell stack, comprising:

[0032] An acquisition module is used to obtain the current voltage, current input pressure, current temperature and current metering ratio of the battery stack;

[0033] A judgment module, used to judge whether the fuel cell stack meets a preset fuel cell stack life control condition according to at least one of the current voltage, the current input pressure, the current temperature and the current metering ratio;

[0034] A control module is used to calculate the target output power of the fuel cell system according to the current voltage and the preset current of the fuel cell stack when the fuel cell stack meets the preset fuel cell stack life control conditions, and to control the life of the fuel cell system based on the target output power.

[0035] Optionally, in some embodiments, the judgment module is specifically used to:

[0036] Obtaining a current voltage decay rate according to the current input pressure, the current temperature and the current metering ratio;

[0037] Whether the battery stack meets the preset battery stack life control condition is determined based on the current voltage decay rate and the preset voltage decay rate reference value.

[0038] Optionally, in some embodiments, the judgment module is specifically used to:

[0039] Calculating a first difference between a preset voltage and the current voltage, and when the first difference is greater than or equal to a first preset threshold value and when the current voltage decay rate is less than or equal to a preset voltage decay rate reference value, calculating a second difference between the first difference and the current voltage decay rate;

[0040] When the second difference is greater than or equal to a second preset threshold, it is determined that the fuel cell stack meets the preset fuel cell stack life control condition.

[0041] Optionally, in some embodiments, after calculating the first difference between the preset voltage and the current voltage, the judgment module is specifically configured to:

[0042] When the first difference is greater than or equal to the first preset threshold value, and the current voltage decay rate is greater than the preset voltage decay rate reference value, it is determined that the fuel cell stack meets the preset fuel cell stack life control condition.

[0043] Optionally, in some embodiments, before calculating the target output power of the fuel cell system according to the current voltage and the preset current of the fuel cell stack, the control module is further configured to:

[0044] The preset current of the battery stack is determined based on a preset battery stack output interpolation table.

[0045] Optionally, in some embodiments, before determining the preset current of the battery stack based on the preset battery stack output interpolation table, the acquisition module is further used to:

[0046] Obtaining a polarization curve of the stack in a bench test;

[0047] Based on the polarization curve, determining an output current according to the preset voltage, and obtaining an output power according to the preset voltage and the output current;

[0048] The preset stack output interpolation table is obtained according to the preset voltage, the output current and the output power.

[0049] Optionally, in some embodiments, when the life of the fuel cell system is controlled based on the target output power, the control module is further configured to:

[0050] Obtaining the real-time output voltage and real-time output current of the battery stack;

[0051] updating the polarization curve based on the real-time output voltage and the real-time output current;

[0052] The preset stack output interpolation table is recalculated according to the updated polarization curve.

[0053] Optionally, in some embodiments, before obtaining the current voltage decay rate according to the current input pressure, the current temperature and the current metering ratio, the acquisition module is further configured to:

[0054] Obtain input pressure, temperature and stoichiometric ratio in bench stack accelerated testing;

[0055] The preset voltage decay rate reference value is obtained according to the input pressure, the temperature and the metering ratio in the bench stack accelerated test.

[0056] A third aspect of the present application provides a fuel cell system, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the life control method of the fuel cell stack as described in the above embodiment.

[0057] Thus, by obtaining the current voltage, current input pressure, current temperature and current metering ratio of the battery stack, it is determined whether the battery stack meets the preset battery stack life control conditions according to at least one of the current voltage, current input pressure, current temperature and current metering ratio. If the battery stack meets the preset battery stack life control conditions, the target output power of the fuel cell system is calculated according to the current voltage and the preset current of the battery stack, and the life of the fuel cell system is controlled based on the target output power. Thus, the problems of the difficulty in monitoring and controlling the life decay of commercial vehicle fuel cells in online operation and the low service life caused by the decay of battery stack performance are solved, the accuracy of online monitoring of battery stack life is greatly improved, and the real-time limit range of battery stack output power is accurately calculated, thereby effectively extending the service life of the battery stack.

[0058] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0060] Figure 1 A flowchart of a method for controlling the life of a battery stack according to an embodiment of the present application;

[0061] Figure 2 It is a flow chart of a method for online monitoring of stack life and controlling life of a commercial vehicle fuel cell according to a specific embodiment of the present application;

[0062] Figure 3 A schematic diagram of an online monitoring strategy for the life of a fuel cell stack and a life control strategy for a commercial vehicle fuel cell according to a specific embodiment of the present application;

[0063] Figure 4 A block diagram of a life control device for a fuel cell stack provided according to an embodiment of the present application;

[0064] Figure 5 It is a block diagram of a fuel cell system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0065] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0066] The following describes the life control method, device and fuel cell system of the stack of the embodiment of the present application with reference to the accompanying drawings. In view of the problems mentioned in the above background technology that the life decay of the fuel cell of the online operation of commercial vehicles is difficult to monitor and control, and the life of the stack is low due to the decay of the performance of the stack, the present application provides a life control method of the stack, in which the current voltage, current input pressure, current temperature and current metering ratio of the stack are obtained; according to at least one of the current voltage, current input pressure, current temperature and current metering ratio, it is judged whether the stack meets the preset life control condition of the stack; if the stack meets the preset life control condition of the stack, the target output power of the fuel cell system is calculated according to the current voltage and the preset current of the stack, and the life of the fuel cell system is controlled based on the target output power. Thus, the problems such as the difficulty in monitoring and controlling the life decay of the fuel cell of the online operation of commercial vehicles, the low life due to the decay of the performance of the stack, etc. are solved, the accuracy of the online monitoring of the life of the stack is greatly improved, and the limit range of the real-time output power of the stack is accurately calculated, thereby effectively extending the life of the stack.

[0067] Specifically, Figure 1 A schematic flow chart of a method for controlling the life of a fuel cell stack provided in an embodiment of the present application.

[0068] like Figure 1 As shown, the life control method of the battery stack includes the following steps:

[0069] In step S101, the current voltage, current input pressure, current temperature and current stoichiometric ratio of the fuel cell stack are obtained.

[0070] Among them, the current voltage, current input pressure and current temperature of the battery stack of the embodiment of the present application are obtained in real time through relevant sensors. The current metering ratio of the battery stack of the embodiment of the present application can be directly measured by professional instruments and equipment, or it can be analyzed and processed by the monitoring system of the fuel cell system. In addition, the embodiment of the present application can also obtain the current requested power of the commercial vehicle ECU (Electronic Control Unit) to the DC (Direct Current) end of the fuel cell.

[0071] Optionally, the embodiment of the present application can also obtain the current current of the fuel cell stack and the requested current of the commercial vehicle ECU to the DC end of the fuel cell.

[0072] It is understandable that the real-time voltage, real-time current, real-time input pressure, real-time temperature and real-time metering ratio of the battery stack can reflect the risk of battery stack performance degradation or failure. Similarly, if the requested power or requested current exceeds the current carrying capacity of the battery stack, it may also cause accelerated aging or damage to the battery stack. Furthermore, when the performance degradation of the battery stack is detected, the degradation rate can be slowed down by adjusting the operating parameters, optimizing the control strategy or limiting the output power.

[0073] Therefore, the embodiment of the present application obtains data such as the current voltage, current input pressure, current temperature, current metering ratio and current requested power of the fuel cell stack, and uses them as comparison values ​​for online fuel cell stack life monitoring. By accurately and real-time acquisition of these key parameters, not only the reliability and safety of the fuel cell system can be improved, but also the operating costs can be reduced and the service life of the fuel cell stack can be extended.

[0074] In step S102, it is determined whether the fuel cell stack meets the preset fuel cell stack life control condition according to at least one of the current voltage, the current input pressure, the current temperature and the current metering ratio.

[0075] Among them, the preset fuel cell stack life control condition in the embodiment of the present application is that the fuel cell stack has performance degradation.

[0076] Specifically, the embodiment of the present application needs to determine whether the battery stack has performance degradation based on at least one of the current voltage, current input pressure, current temperature and current metering ratio of the battery stack obtained in step S101. If the battery stack has degradation, it is determined that the battery stack meets the preset battery stack life control conditions, and then the battery stack is further inspected and maintained.

[0077] Optionally, in some embodiments, whether the fuel cell stack meets the preset fuel cell stack life control conditions is judged based on at least one of the current voltage, the current input pressure, the current temperature and the current metering ratio, including: obtaining the current voltage decay rate based on the current input pressure, the current temperature and the current metering ratio; judging whether the fuel cell stack meets the preset fuel cell stack life control conditions based on the current voltage decay rate and a preset voltage decay rate reference value.

[0078] It can be understood that the embodiment of the present application calculates the current voltage decay rate according to the current input pressure, current temperature and current metering ratio of the fuel cell stack in accordance with the fuel cell stack accelerated test method.

[0079] Specifically, the embodiment of the present application calculates the current voltage decay rate by the stack acceleration test method, that is, obtains the input pressure p of the stack acceleration test. halt , input temperature T halt , stoichiometric ratio λ halt As a comparison value, the current input pressure p in 、Current temperature T in , current metering ratio λ in , according to the battery stack accelerated test method, the current voltage decay rate is calculated as:

[0080] ΔV run =(p in , T in ,λ in )*ΔV halt / (p halt , T halt ,λ halt );

[0081] Where, ΔV run is the current voltage decay rate, p in is the current input pressure of the stack, T in is the current temperature of the battery stack, λ in is the current stoichiometric ratio of the stack, ΔV halt is the preset voltage decay rate reference value, p halt is the input pressure of the bench acceleration test, T halt is the input temperature of the bench accelerated test, λ halt It is the metrological ratio of the bench acceleration test.

[0082] It should be noted that the numerator in the above formula represents the real-time collection of input pressure, temperature and stoichiometric ratio when the fuel cell stack is running, and the denominator represents the calibrated values ​​of input pressure, temperature and stoichiometric ratio during the accelerated test of the fuel cell stack. The current voltage decay rate of the embodiment of the present application represents the coupling mapping of the actual measured values ​​and the calibrated values ​​of the input pressure, temperature and stoichiometric ratio of the fuel cell stack. Since the actual operation collection values ​​of the fuel cell stack are dynamic and changing, the embodiment of the present application establishes the association and mapping relationship between the actual measured values ​​and the calibrated values ​​through the ratio. The current voltage decay rate reflects the relationship and mutual influence between the actual measured values ​​and the calibrated values.

[0083] Specifically, the embodiment of the present application first calculates the ratio of the actual measured value to the calibration value, that is, The ratio of the actual measured value to the calibrated value reflects the relative change between the actual measured value and the calibrated value. Then, the ratio of the actual measured value to the calibrated value is multiplied by the preset voltage decay rate reference value ΔV. halt , get the current voltage decay rate.

[0084] That is, ΔV run =f(p halt , T halt ,λ halt ), by calibrating the preset bench p halt , T halt ,λ halt The rate of change is obtained with ΔV run The mapping relationship of the system operation collection (p in , T in ,λ in ) relative to the rate of change of (p halt , T halt ,λ halt ), that is: [(p in / p halt )*(T in / T halt )*(λ in / λ halt )] to obtain the voltage change rate of the actual operating condition, therefore, the current voltage decay rate of the embodiment of the present application can also be understood as:

[0085] ΔV run =ΔV halt *[(p in / p halt )*(T in / T halt )*(λ in / λ halt )];

[0086] It should be noted that as the battery stack approaches the BOL (Beginning of Life) life time, the current voltage decay rate ΔV run May be greater than the preset voltage decay rate reference value ΔV halt .

[0087] Optionally, in some embodiments, before obtaining the current voltage decay rate based on the current input pressure, the current temperature and the current metering ratio, it also includes: obtaining the input pressure, temperature and metering ratio in the bench stack accelerated test; obtaining a preset voltage decay rate reference value based on the input pressure, temperature and metering ratio in the bench stack accelerated test.

[0088] It is understandable that the embodiment of the present application provides a method for obtaining a preset voltage decay rate reference value, which is a reference value of the voltage decay rate for online monitoring of the life of the battery stack. The embodiment of the present application needs to obtain the voltage decay rate affected by fluctuations in input pressure, temperature and metering ratio in the bench battery stack acceleration test.

[0089] In the bench accelerated test, it is necessary to simulate the fluctuations in input pressure, temperature and stoichiometric ratio that the fuel cell stack may encounter under various actual operating conditions. By controlling parameters such as input pressure, temperature and stoichiometric ratio and recording the corresponding voltage output changes, the voltage decay rate can be obtained.

[0090] Specifically, the embodiment of the present application can determine the law of the voltage decay rate under different input conditions by analyzing the data in the above-mentioned bench accelerated test, thereby obtaining a voltage decay rate reference value. Furthermore, the preset voltage decay rate reference value can be used as a basis for online monitoring of the life of the fuel cell stack.

[0091] Therefore, the embodiment of the present application can provide an important reference basis for online monitoring of the life of the fuel cell stack by obtaining the reference value of the voltage decay rate affected by the fluctuation of input conditions in the bench fuel cell accelerated test, which helps to timely discover the performance degradation of the fuel cell stack and take corresponding measures, thereby extending the service life of the fuel cell stack and improving the reliability of the fuel cell system.

[0092] It is understandable that, in actual operation, the embodiment of the present application monitors the changes in input pressure, temperature and metering ratio in real time, calculates the corresponding current voltage decay rate, and compares it with the preset voltage decay rate reference value. If the voltage decay rate measured in real time exceeds the reference value, it may mean that the performance of the battery stack is accelerating, and corresponding measures need to be taken for maintenance or replacement.

[0093] Optionally, in some embodiments, judging whether the fuel cell stack meets the preset fuel cell stack life control conditions is based on the current voltage decay rate and a preset voltage decay rate reference value, including: calculating a first difference between a preset voltage and a current voltage; if the first difference is greater than or equal to a first preset threshold, then when the current voltage decay rate is less than or equal to the preset voltage decay rate reference value, calculating a second difference between the first difference and the current voltage decay rate; if the second difference is greater than or equal to the second preset threshold, determining that the fuel cell stack meets the preset fuel cell stack life control conditions.

[0094] The preset voltage in the embodiment of the present application is the output voltage of the battery stack, which can be calculated by a certain algorithm or model. The first preset threshold in the embodiment of the present application is 0, and the second preset threshold in the embodiment of the present application is 0.

[0095] It can be understood that the embodiment of the present application uses a predictive detection algorithm through a FCCU (Fuel Cell Control Unit) to process the collected data in real time and evaluate the performance of the fuel cell stack.

[0096] In some cases, when the current voltage decay rate is less than or equal to a preset voltage decay rate reference value, the embodiment of the present application calculates a first difference between the preset voltage and the current voltage, and the first difference serves as an important basis for determining whether the fuel cell stack has performance decay.

[0097] Specifically, if the first difference is less than 0, it means that the actual operating voltage of the stack is higher than the expected value, and it is determined that the performance of the stack has not decayed or the decay is within an acceptable range. In this case, the FCCU will assume that the stack voltage has no durable decay and no additional life control operation is required. In addition, in this case, the fuel cell system can output normally according to the requested power.

[0098] However, if the first difference is greater than or equal to 0, it means that the output voltage of the battery stack is lower than the expected value, and there may be performance degradation. At this time, the embodiment of the present application needs to further calculate the second difference between the first difference and the current voltage decay rate, and then judge whether there is performance degradation in the battery stack based on the second difference, that is, whether it meets the preset battery stack life control conditions.

[0099] It should be noted that the above steps help to more accurately evaluate the performance degradation of the fuel cell stack and provide a basis for subsequent life control.

[0100] Therefore, the monitoring method of the embodiment of the present application can effectively identify the performance degradation of the fuel cell stack, which helps to ensure the stable operation of the fuel cell system while extending the service life of the fuel cell stack.

[0101] It can be understood that when the first difference is greater than or equal to 0, it indicates that the actual operating voltage of the fuel cell stack is lower than its expected value, which usually means that the performance of the stack may have decayed. As the stack operation time increases and is affected by unforeseen environments and operating conditions, the current voltage will be less than or equal to the preset voltage. If the first difference is greater than or equal to 0, it is necessary to determine the difference between the first difference and the current voltage decay rate to determine whether the voltage decay is caused by durability issues.

[0102] Specifically, if the first difference and the second difference of the current voltage decay rate are less than 0, it means that although there is voltage decay, the decay rate does not exceed the current voltage decay rate monitored in real time. In this case, the FCCU will assume that the stack voltage has no significant durability decay, so there is no need for emergency or special life control measures, and the fuel cell system can continue to operate normally according to the requested power.

[0103] However, if the first difference and the second difference of the current voltage decay rate are greater than or equal to 0, it indicates that the voltage decay rate exceeds the current voltage decay rate monitored in real time, which means that the performance decay of the battery stack may be serious and a life control strategy needs to be adopted. In this case, the FCCU will trigger the corresponding life control mechanism, and the control mechanism of the embodiment of the present application is to limit the output power of the battery stack.

[0104] It should be noted that the control mechanism of the embodiment of the present application may also include adjusting the working conditions of the fuel cell stack, optimizing the supply of reactants, etc., which are not specifically limited here, so as to slow down the attenuation rate of the fuel cell stack and extend its service life.

[0105] Optionally, in some embodiments, after calculating the first difference between the preset voltage and the current voltage, it also includes: if the first difference is greater than or equal to a first preset threshold, and the current voltage decay rate is greater than a preset voltage decay rate reference value, then it is determined that the battery stack meets the preset battery stack life control conditions.

[0106] That is to say, if the current voltage decay rate is greater than the preset voltage decay rate reference value, it means that the fuel cell has decayed. The embodiment of the present application can directly determine that the fuel cell meets the preset fuel cell life control conditions, that is, the fuel cell needs to be life controlled.

[0107] Therefore, the FCCU of the embodiment of the present application can evaluate the performance degradation of the fuel cell stack in real time and accurately through the preset monitoring algorithm, and provide effective technical support for the online monitoring and life management of the stack. This helps to timely discover potential problems of the stack and take corresponding measures to extend the service life of the stack and improve the reliability of the system.

[0108] In step S103, if the fuel cell stack meets the preset fuel cell stack life control conditions, the target output power of the fuel cell system is calculated according to the current voltage and the preset current of the fuel cell stack, and the life of the fuel cell system is controlled based on the target output power.

[0109] It is understandable that when the stack meets the preset stack life control conditions, that is, when the stack has performance degradation, the fuel cell system needs to be life controlled. Specifically, the embodiment of the present application limits the output power of the stack to achieve life control of the fuel cell system, that is, the embodiment of the present application needs to re-look up the table to control the current output based on the collected real-time voltage data to achieve the goal of fuel cell life control.

[0110] Optionally, in some embodiments, before calculating the target output power of the fuel cell system according to the current voltage and the preset current of the stack, the method further includes: determining the preset current of the stack based on a preset stack output interpolation table.

[0111] It is understandable that the target output power of the embodiment of the present application is the product of the current voltage and the preset current, wherein the current voltage of the battery stack is obtained in real time by the voltage sensor. The preset current of the embodiment of the present application can be obtained by looking up the preset battery stack output interpolation table.

[0112] Specifically, the stack output interpolation table preset in the embodiment of the present application includes a series of output voltage values ​​and their corresponding output current and power values, and then the output current and power corresponding to any output voltage can be found between multiple discrete points through interpolation.

[0113] Optionally, in some embodiments, before determining the preset current of the battery stack based on the preset battery stack output interpolation table, it also includes: obtaining a polarization curve of the battery stack in a bench test; based on the polarization curve, determining the output current according to a preset voltage, and obtaining the output power according to the preset voltage and the output current; and obtaining a preset battery stack output interpolation table according to the preset voltage, output current and output power.

[0114] Among them, the polarization curve of the embodiment of the present application is obtained by bench testing the battery stack. The polarization curve is a graph describing the relationship between the output voltage and output current of the battery stack, which can reflect the voltage characteristics of the battery stack under different output currents and is the basis for the subsequent calculation of the preset battery stack output interpolation table.

[0115] It can be understood that the embodiment of the present application determines the output current and output power at a preset voltage by obtaining the voltage-current polarization curve after calibrating the sensitivity of the bench test stack input temperature, pressure, stoichiometric ratio, etc., thereby obtaining a preset stack output interpolation table.

[0116] Specifically, in the bench test, the embodiment of the present application conducts a comprehensive test on the fuel cell stack, tests the performance of the stack under different temperature, pressure and stoichiometric ratio conditions, and calibrates these sensitive parameters; under the calibrated parameter conditions, the voltage-current polarization curve of the fuel cell stack is measured by changing the output current of the stack and recording the corresponding output voltage; further, the embodiment of the present application can also record the measured voltage-current data and perform necessary processing, such as filtering and smoothing, to eliminate measurement noise and errors.

[0117] Furthermore, according to the measured polarization curve, the output current corresponding to the preset output voltage is found through interpolation or curve fitting, so that the voltage value and the current value are multiplied to obtain the output power.

[0118] Finally, based on the measured polarization curve and the calculated output current and power at a specific output voltage, a preset battery stack output interpolation table is generated. The preset battery stack output interpolation table contains a series of output voltage values ​​and their corresponding output current and power values, and through the interpolation method, the output current and power corresponding to any output voltage can be found between these discrete points.

[0119] Therefore, the embodiment of the present application obtains the voltage-current polarization curve of the bench test stack after calibration, and determines the output current and power at a specific output voltage, and then generates a preset stack output interpolation table. The preset stack output interpolation table will provide an important reference for performance optimization and life control of the fuel cell system.

[0120] It is understandable that power is a direct reflection of the performance of a fuel cell system. It reflects the energy that the system can convert and output within a certain period of time. By controlling power, the workload and output characteristics of the stack can be indirectly controlled, thereby preventing the stack from operating under excessively high or low loads.

[0121] Based on the above embodiments, it can be known that the preset battery stack output interpolation table of the embodiment of the present application takes into account the polarization curve of the battery stack, that is, it takes into account the operating parameters of the battery stack under different working conditions, including the range of voltage and current. Therefore, the embodiment of the present application obtains a preset current based on the preset battery stack output interpolation table, and multiplies the preset current by the current voltage. The obtained target output power conforms to the current operating state of the battery stack. That is to say, the life of the battery stack is controlled according to the target output power, which can ensure that the battery stack operates within the optimal working range, thereby ensuring its stability and reducing performance degradation.

[0122] Therefore, in actual operation, the fuel cell system encounters various operating condition changes, such as load changes, temperature changes, etc. The embodiment of the present application can obtain the current voltage and obtain the target output power in combination with a preset stack output interpolation table to control the output power of the fuel cell system according to the target output power. It can realize dynamic adjustment and optimization of the output power of the fuel cell system, thereby optimizing the operating efficiency of the fuel cell system, reducing unnecessary energy loss, avoiding overload operation, and at the same time preventing the stack from being affected by adverse operating conditions and extending its service life.

[0123] In addition, the embodiment of the present application can greatly simplify the operation and maintenance of the fuel cell system by simply acquiring the current voltage of the fuel cell stack in real time and controlling the life of the fuel cell stack by table lookup.

[0124] Therefore, the FCCU of the embodiment of the present application can flexibly adjust the output power according to the real-time working status and performance degradation of the fuel cell stack to achieve effective life control, thereby ensuring the stable operation of the fuel cell system, while maximizing the service life of the fuel cell stack and improving the economy and reliability of the entire system.

[0125] Optionally, in some embodiments, when the life of the fuel cell system is controlled based on the target output power, it also includes: obtaining the real-time output voltage and real-time output current of the stack; updating the polarization curve based on the real-time output voltage and real-time output current; and recalculating the preset stack output interpolation table according to the updated polarization curve.

[0126] It is understood by those skilled in the art that the performance of the stack will decay over time, and the polarization curve of the stack will also degrade accordingly, and the current setting that exceeds the polarization curve capacity of the fuel cell will accelerate the performance decay of the fuel cell. Therefore, in order to avoid the above problems and ensure the effect of online life control of commercial vehicle fuel cells, the embodiment of the present application obtains the real-time output voltage and real-time output current of the stack when the fuel cell system is controlled based on the target output power, so as to update the polarization curve of the stack, which is not only convenient for calculation and use when life control is needed next time, but also allows users to understand the current usage and performance status of the stack in a timely manner.

[0127] Furthermore, since the performance of the battery stack will gradually decay with use, it becomes particularly important to update the interpolation table based on real-time data. Therefore, the embodiment of the present application uses the updated polarization curve and, based on the interpolation method, finds the output current corresponding to the preset voltage value, thereby calculating the output power, and adjusts the values ​​in the interpolation table accordingly to obtain an updated preset battery stack output interpolation table.

[0128] That is to say, when the life of the fuel cell system is controlled based on the target output power, the embodiment of the present application needs to monitor the real-time output voltage and real-time output current of the fuel cell stack, and update the polarization curve based on the real-time output voltage and real-time output current, and then recalculate the above-mentioned preset fuel cell stack output interpolation table to achieve real-time update of the preset fuel cell stack output interpolation table, so as to facilitate calculation and use the next time life control is needed, thereby realizing online life control of commercial vehicle fuel cells.

[0129] Therefore, in the process of real-time updating, the FCCU of the embodiment of the present application will use advanced algorithms and calculation methods to recalculate the various values ​​in the interpolation table based on the real-time data collected. The next time a situation requires life control, the FCCU can directly use the updated interpolation table for calculation, thereby more accurately controlling the output power of the fuel cell and realizing online life control of commercial vehicle fuel cells. Therefore, the FCCU of the embodiment of the present application can continuously adapt to changes in the performance of the fuel cell stack and adjust the control strategy in real time to ensure the stable operation of the fuel cell system and extend the service life of the fuel cell stack.

[0130] In order to enable those skilled in the art to further understand the life control method of the fuel cell stack of the embodiment of the present application, the following examples are listed to schematically illustrate the implementation steps of the method.

[0131] Specifically, Figure 2 This is a flowchart of a method for online monitoring of stack life and controlling the life of a commercial vehicle fuel cell according to a specific embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0132] Step S0, obtaining the voltage-current polarization curve after the sensitivity calibration of the bench test stack input temperature, pressure, stoichiometric ratio, etc., and determining the output voltage V cal Output current I under (unit V) cal (A) Output P cal (Unit: KW / s), thereby obtaining a preset stack output interpolation table;

[0133] Step S1, obtaining the input pressure P during the bench stack acceleration test halt-in , Temperature T halt-in , stoichiometric ratio λ halt Voltage decay rate ΔV affected by fluctuations halt (i.e., the preset voltage decay rate reference value), which is used as the voltage decay rate reference value for online monitoring of the stack life;

[0134] Step S2, obtaining the real-time voltage V of the online running battery stack run 、Current I run , input pressure p in , Temperature T in , stoichiometric ratio λin , the commercial vehicle ECU requests the power P of the fuel cell DC terminal req , Request current I req , as a comparison value for online stack life monitoring, and according to the collected input pressure p in , Temperature T in , stoichiometric ratio λ in , calculate the real-time voltage decay rate ΔV according to the stack accelerated test method run (i.e., the current voltage decay rate);

[0135] Step S3: The fuel cell controller FCCU presets a monitoring algorithm to obtain the stack operating voltage V run (i.e. current voltage) and output voltage V cal (i.e., the preset voltage) difference (i.e., the first difference) ΔV dec =V cal -V run , if ΔV dec ≥0, then calculate ΔV dec -ΔV run or ΔV dec -ΔV halt (i.e., the second difference), if ΔV dec <0, the default stack voltage has no durability attenuation, no life control is required, and the fuel cell output request power P req ;

[0136] Step S4: The fuel cell controller FCCU presets a monitoring algorithm. When ΔV dec ≥0, and ΔV run ≤ΔV halt When ΔV dec -ΔV run <0, the default stack voltage has no durability attenuation, no life control is required, and the fuel cell output request power P req , if ΔV dec -ΔV run ≥0, the fuel cell life control is performed;

[0137] Step S5: The fuel cell controller FCCU presets a monitoring algorithm. When ΔV dec ≥0, and ΔV run >ΔV halt When ΔV dec -ΔV halt Whatever the result is, it is assumed that the battery stack needs life control;

[0138] Step S6: The fuel cell controller FCCU presets a life control algorithm. When the fuel cell stack life control conditions are met in steps S3, S4, and S5, the real-time voltage V is collected. runAnd calculate the preset current I according to the interpolation table in step S0 cal , calculate the output power P during life control con =V run x I cal ;

[0139] In step S7, the fuel cell controller FCCU presets a life control update algorithm, outputs voltage and current according to the life control strategy of step S6, updates the polarization curve of the fuel cell stack, and recalculates the interpolation table at step S0 and updates it online in real time, so that it can be calculated and used next time when life control is needed, thereby realizing online life control of commercial vehicle fuel cells.

[0140] Therefore, the present application performs online monitoring of the life of the fuel cell stack and life control of commercial vehicle fuel cells, and accurately determines the data affecting the life of the fuel cell stack by monitoring the real-time voltage and current parameter coupling, thereby accurately calculating the real-time fuel cell stack output power limit range, so that the life of the fuel cell stack can be extended online, thereby improving the life of commercial vehicle fuel cells in online operation.

[0141] Next, specific embodiments will be listed to schematically illustrate the commercial vehicle fuel cell life control strategy of the embodiment of the present application.

[0142] Specifically, Figure 3 This is a schematic diagram of a specific embodiment of the present application for online monitoring of the life of a fuel cell stack and a life control strategy for a commercial vehicle fuel cell. Figure 3 As shown,

[0143] Figure 3 The 1 in the figure indicates the battery stack to be monitored, and the 2 indicates the output limit current I run , 3 represents the output stack operating voltage V run , 4 indicates real-time acquisition of stack input pressure p in , 5 means real-time acquisition of stack temperature T in , 6 indicates real-time acquisition of stack metering ratio λ in , 7 is the FCCU life control calculation, 8 indicates the establishment of a preset stack output interpolation table based on the calibration value, 9 is the FCCU monitoring calculation, and 10 indicates the acquisition of the fuel cell DC terminal request power P req , 11 represents the output life limit power P con , 12 represents the life control algorithm of the battery stack.

[0144] First, the embodiment of the present application obtains the current SOC (State of Charge) of the commercial vehicle and sends a request power P to the DC end of the fuel cell. req , stack operating voltage V run , collect input pressure p in , Temperature T in , stoichiometric ratio λin ,exist Figure 3 At 9 points in the calculation, the FCCU is used for monitoring; if life control is not required, the output is P req And the corresponding output current I calculated according to the power run Based on the above embodiments, it can be seen that when the battery stack meets the life control conditions, Figure 3 At 12 points in the figure, the FCCU performs life control calculations and outputs the life limit power P con And limit current I run ; When the battery stack meets the life control conditions, Figure 3 At 12 in the figure, the FCCU performs life control calculations and outputs the preset stack output interpolation table for online update ( Figure 3 8 in the figure) to facilitate calculation and use the next time life control is needed, thus realizing online life control of commercial vehicle fuel cells.

[0145] Therefore, the embodiment of the present application monitors the working status and performance degradation of the fuel cell stack in real time, flexibly adjusts the output power to achieve effective life control, and when performing fuel cell stack life control, uses the actual output voltage and current data to recalculate the preset fuel cell stack output interpolation table to achieve online real-time updates, thereby effectively improving the reliability of the fuel cell system.

[0146] According to the life control method of the battery stack proposed in the embodiment of the present application, by obtaining the current voltage, current input pressure, current temperature and current metering ratio of the battery stack, it is judged whether the battery stack meets the preset battery stack life control conditions according to at least one of the current input pressure, current input pressure, current temperature and current metering ratio. If the battery stack meets the preset battery stack life control conditions, the target output power of the fuel cell system is calculated according to the current voltage and the preset current of the battery stack, and the life of the fuel cell system is controlled based on the target output power. In this way, the problems of the difficulty in monitoring and controlling the life decay of commercial vehicle fuel cells in online operation and the low service life caused by the decay of battery stack performance are solved, the accuracy of online monitoring of battery stack life is greatly improved, and the real-time limit range of battery stack output power is accurately calculated, thereby effectively extending the service life of the battery stack.

[0147] Next, the life control device of the fuel cell stack proposed in accordance with the embodiment of the present application will be described with reference to the accompanying drawings.

[0148] Figure 4 It is a block diagram of a life control device for a fuel cell stack according to an embodiment of the present application.

[0149] like Figure 4 As shown, the life control device 10 of the fuel cell stack includes: an acquisition module 100 , a judgment module 200 and a control module 300 .

[0150] Specifically, the acquisition module 100 is used to obtain the current voltage, current input pressure, current temperature and current metering ratio of the fuel cell stack; the judgment module 200 is used to judge whether the fuel cell stack meets the preset fuel cell stack life control conditions based on at least one of the current voltage, current input pressure, current temperature and current metering ratio; the control module 300 is used to calculate the target output power of the fuel cell system based on the current voltage and the preset current of the fuel cell stack when the fuel cell stack meets the preset fuel cell stack life control conditions, and to control the life of the fuel cell system based on the target output power.

[0151] Optionally, in some embodiments, the judgment module 200 is specifically used to: obtain the current voltage decay rate according to the current input pressure, the current temperature and the current metering ratio; and judge whether the battery stack meets the preset battery stack life control conditions according to the current voltage decay rate and the preset voltage decay rate reference value.

[0152] Optionally, in some embodiments, the judgment module 200 is specifically used to: calculate a first difference between a preset voltage and a current voltage; when the first difference is greater than or equal to a first preset threshold value, and when the current voltage decay rate is less than or equal to a preset voltage decay rate reference value, calculate a second difference between the first difference and the current voltage decay rate; and when the second difference is greater than or equal to a second preset threshold value, determine whether the battery stack meets the preset battery stack life control conditions.

[0153] Optionally, in some embodiments, after calculating the first difference between the preset voltage and the current voltage, the judgment module 200 is specifically used to determine that the battery stack meets the preset battery stack life control conditions when the first difference is greater than or equal to the first preset threshold and the current voltage decay rate is greater than a preset voltage decay rate reference value.

[0154] Optionally, in some embodiments, before calculating the target output power of the fuel cell system according to the current voltage and the preset current of the fuel cell stack, the control module is further used to: determine the preset current of the fuel cell stack based on a preset fuel cell stack output interpolation table.

[0155] Optionally, in some embodiments, before determining the preset current of the battery stack based on the preset battery stack output interpolation table, the acquisition module 100 is also used to: obtain the polarization curve of the battery stack in the bench test; based on the polarization curve, determine the output current according to the preset voltage, and obtain the output power according to the preset voltage and the output current; obtain the preset battery stack output interpolation table according to the preset voltage, output current and output power.

[0156] Optionally, in some embodiments, when the life of the fuel cell system is controlled based on the target output power, the control module 300 is also used to: obtain the real-time output voltage and real-time output current of the fuel cell stack; update the polarization curve based on the real-time output voltage and real-time output current; and recalculate the preset fuel cell stack output interpolation table according to the updated polarization curve.

[0157] Optionally, in some embodiments, before obtaining the current voltage decay rate based on the current input pressure, the current temperature and the current metering ratio, the acquisition module 100 is also used to: obtain the input pressure, temperature and metering ratio in the bench stack accelerated test; obtain a preset voltage decay rate reference value based on the input pressure, temperature and metering ratio in the bench stack accelerated test.

[0158] It should be noted that the above explanation of the embodiment of the fuel cell stack life control method is also applicable to the fuel cell stack life control device of this embodiment, and will not be repeated here.

[0159] According to the life control device of the battery stack proposed in the embodiment of the present application, by obtaining the current voltage, current input pressure, current temperature and current metering ratio of the battery stack, it is judged whether the battery stack meets the preset battery stack life control conditions according to at least one of the current voltage, current input pressure, current temperature and current metering ratio. If the battery stack meets the preset battery stack life control conditions, the target output power of the fuel cell system is calculated according to the current voltage and the preset current of the battery stack, and the life of the fuel cell system is controlled based on the target output power. In this way, the problems of the difficulty in monitoring and controlling the life decay of commercial vehicle fuel cells in online operation and the low service life caused by the decay of battery stack performance are solved, the accuracy of online monitoring of battery stack life is greatly improved, and the real-time limit range of battery stack output power is accurately calculated, thereby effectively extending the service life of the battery stack.

[0160] Figure 5 A schematic diagram of the structure of a fuel cell system provided in an embodiment of the present application. The fuel cell system may include:

[0161] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0162] When the processor 502 executes the program, the life control method of the fuel cell stack provided in the above embodiment is implemented.

[0163] Furthermore, the fuel cell system further comprises:

[0164] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0165] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0166] The memory 501 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0167] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0168] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0169] The processor 502 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0170] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0171] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0172] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0173] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0174] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0175] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for controlling the life of a battery stack, characterized in that: The following steps are involved: Obtain the current voltage, current input pressure, current temperature and current stoichiometric ratio of the battery stack; Determining whether the fuel cell stack meets a preset fuel cell stack life control condition according to at least one of the current voltage, the current input pressure, the current temperature and the current metering ratio; If the fuel cell stack meets the preset fuel cell stack life control condition, the target output power of the fuel cell system is calculated according to the current voltage and the preset current of the fuel cell stack, and the life of the fuel cell system is controlled based on the target output power; The judging whether the battery stack meets the preset battery stack life control condition according to at least one of the current voltage, the current input pressure, the current temperature and the current metering ratio comprises: obtaining the current voltage decay rate according to the current input pressure, the current temperature and the current metering ratio; judging whether the battery stack meets the preset battery stack life control condition according to the current voltage decay rate and a preset voltage decay rate reference value; The judging whether the battery stack meets the preset battery stack life control condition according to the current voltage decay rate and the preset voltage decay rate reference value comprises: calculating a first difference between a preset voltage and the current voltage; if the first difference is greater than or equal to a first preset threshold, then when the current voltage decay rate is less than or equal to the preset voltage decay rate reference value, calculating a second difference between the first difference and the current voltage decay rate; if the second difference is greater than or equal to a second preset threshold, judging that the battery stack meets the preset battery stack life control condition; The current voltage decay rate is obtained by using the battery stack accelerated test, and the calculation formula of the current voltage decay rate is: ΔV run =(p in ,T in ,l in )*ΔV halt / (p halt ,T halt ,l halt )=ΔV halt *[(p in / p halt )*(T in / T halt )*(λ) in / l halt )]; Where, ΔV run is the current voltage decay rate, p in is the current input pressure of the stack, T in is the current temperature of the battery stack, λ in is the current stoichiometric ratio of the stack, ΔV halt is the preset voltage decay rate reference value, p halt is the input pressure of the bench acceleration test, T halt is the input temperature of the bench accelerated test, λ halt is the metrological ratio of the bench acceleration test; Before obtaining the current voltage decay rate according to the current input pressure, the current temperature and the current metering ratio, it also includes: obtaining the input pressure, temperature and metering ratio in the bench stack accelerated test; obtaining the preset voltage decay rate reference value according to the input pressure, temperature and metering ratio in the bench stack accelerated test.

2. The method according to claim 1, characterized in that After calculating the first difference between the preset voltage and the current voltage, the method further includes: If the first difference is greater than or equal to the first preset threshold, and the current voltage decay rate is greater than the preset voltage decay rate reference value, it is determined that the fuel cell stack meets the preset fuel cell stack life control condition.

3. The method according to claim 1, characterized in that: Before calculating the target output power of the fuel cell system according to the current voltage and the preset current of the fuel cell stack, the method further includes: The preset current of the battery stack is determined based on a preset battery stack output interpolation table.

4. The method according to claim 3, characterized in that Before determining the preset current of the battery stack based on the preset battery stack output interpolation table, the method further includes: Obtaining a polarization curve of the stack in a bench test; Based on the polarization curve, determining an output current according to a preset voltage, and obtaining an output power according to the preset voltage and the output current; The preset stack output interpolation table is obtained according to the preset voltage, the output current and the output power.

5. The method according to claim 4, characterized in that When the life of the fuel cell system is controlled based on the target output power, the method further includes: Obtaining the real-time output voltage and real-time output current of the battery stack; updating the polarization curve based on the real-time output voltage and the real-time output current; The preset stack output interpolation table is recalculated according to the updated polarization curve.

6. A life control device for a fuel cell stack, characterized in that: include: An acquisition module is used to obtain the current voltage, current input pressure, current temperature and current metering ratio of the battery stack; A judgment module, used to judge whether the fuel cell stack meets a preset fuel cell stack life control condition according to at least one of the current voltage, the current input pressure, the current temperature and the current metering ratio; A control module, configured to calculate a target output power of the fuel cell system according to the current voltage and a preset current of the fuel cell stack when the fuel cell stack meets the preset fuel cell stack life control condition, and to perform life control on the fuel cell system based on the target output power; The judgment module is specifically used to: obtain the current voltage decay rate according to the current input pressure, the current temperature and the current metering ratio; and judge whether the battery stack meets the preset battery stack life control condition according to the current voltage decay rate and the preset voltage decay rate reference value; The judgment module is specifically used to: calculate a first difference between a preset voltage and the current voltage, and when the first difference is greater than or equal to a first preset threshold value and when the current voltage decay rate is less than or equal to a preset voltage decay rate reference value, calculate a second difference between the first difference and the current voltage decay rate; When the second difference is greater than or equal to a second preset threshold, determining that the fuel cell stack meets the preset fuel cell stack life control condition; The current voltage decay rate is obtained by using the battery stack accelerated test, and the calculation formula of the current voltage decay rate is: ΔV run =(p in ,T in ,l in )*ΔV halt / (p halt ,T halt ,l halt )=ΔV halt *[(p in / p halt )*(T in / T halt )*(λ) in / l halt )]; Where, ΔV run is the current voltage decay rate, p in is the current input pressure of the stack, T in is the current temperature of the battery stack, λ in is the current stoichiometric ratio of the stack, ΔV halt is the preset voltage decay rate reference value, p halt is the input pressure of the bench acceleration test, T halt is the input temperature of the bench accelerated test, λ halt is the metrological ratio of the bench acceleration test; Before obtaining the current voltage decay rate based on the current input pressure, the current temperature and the current metering ratio, the acquisition module is also used to: obtain the input pressure, temperature and metering ratio in the bench stack accelerated test; and obtain the preset voltage decay rate reference value based on the input pressure, temperature and metering ratio in the bench stack accelerated test.

7. A fuel cell system, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the life control method of the fuel cell stack as described in any one of claims 1 to 5.

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