Method, system, electronic device and storage medium for shutting down multiple stacks of hydrogen fuel cells

Abstract

The application discloses a multi-stack hydrogen fuel cell shutdown method, system, electronic equipment and storage medium. The method comprises the following steps: setting the stack target current as a first expected current according to a preset shutdown instruction, and controlling a preset actuator to enter a shutdown preparation stage; setting the stack target current as a second expected current, and closing a preset air valve of an air compressor and an air unit when air compressor speed data meets a preset speed threshold; controlling a boost converter to enter a discharge mode according to preset actuator position information and single cell voltage data; monitoring single cell voltage data to control the boost converter to enter a standby mode, and closing a hydrogen unit and the air unit; and closing a thermal management unit when a fuel cell temperature meets a preset temperature threshold. The application can improve the shutdown efficiency and stability of the multi-stack hydrogen fuel cell, and alleviate the problems of system performance decline and service life attenuation. The application can be widely applied in the field of hydrogen fuel cell technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen fuel cells, and particularly relates to a multi-stack hydrogen fuel cell shutdown method and system, an electronic device and a storage medium. BACKGROUND

[0002] A hydrogen fuel cell is a power generation device based on electrochemical theory, which can directly convert chemical energy in hydrogen and oxygen into electrical energy and output to an energy storage device or an electrical appliance, becoming a new type of power source after an internal combustion engine and a lithium battery. With the wide attention of hydrogen fuel cells in heavy trucks, distributed power generation, rail transit and other fields, the power demand of single hydrogen fuel cell systems gradually increases. In order to meet the demand for high-power energy supply, while avoiding the technical problems of poor durability, high system cost and the like, it is necessary to connect multiple single hydrogen fuel cells in parallel to form a multi-stack working model, and to improve the service life and working efficiency of the system. In related technologies, during the shutdown process of the multi-stack hydrogen fuel cell, the performance of the hydrogen fuel cell system is easily reduced and the service life is attenuated, and due to the complex structure of the multi-stack hydrogen fuel cell, it is difficult to achieve stable and reliable shutdown control, and the shutdown efficiency is low.

[0003] To sum up, the technical problems in the related art need to be improved. SUMMARY

[0004] The main purpose of the embodiments of the present application is to provide a multi-stack hydrogen fuel cell shutdown method, system, electronic device and storage medium, which can effectively improve the shutdown efficiency and stability of the multi-stack hydrogen fuel cell, and effectively alleviate the problems of system performance decline and service life attenuation.

[0005] To achieve the above-mentioned purpose, one aspect of an embodiment of the present application provides a multi-stack hydrogen fuel cell shutdown method, which comprises the following steps:

[0006] According to a preset shutdown instruction, a stack target current of a preset fuel cell is set as a first expected current, and a preset actuator is controlled according to a preset shutdown state calibration value, so as to control the preset fuel cell to enter a shutdown preparation stage; wherein the preset fuel cell comprises a multi-stack hydrogen fuel cell, and the multi-stack hydrogen fuel cell comprises an air unit, a thermal management unit and a hydrogen unit;

[0007] When it is determined that the preset fuel cell enters the shutdown preparation stage, the stack target current is set as a second expected current, and the rotational speed data of an air compressor is dynamically detected;

[0008] When it is determined that the rotational speed data meets a preset rotational speed threshold, a preset air valve of the air compressor and the air unit is closed;

[0009] According to the position information of the preset actuators and the single cell voltage data of the preset fuel cell, control the boost converter to enter a discharge mode;

[0010] Dynamically monitor the single cell voltage data, to control the boost converter to enter a standby mode and shut down the hydrogen unit and the air unit according to the single cell voltage data and a preset single cell voltage threshold value;

[0011] When it is determined that the fuel cell temperature of the preset fuel cell meets a preset temperature threshold value, shut down the thermal management unit.

[0012] In some embodiments, the control of the preset actuators according to the preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation phase comprises:

[0013] Set the preset shutdown state calibration value; wherein the preset shutdown state calibration value comprises a first rotating speed calibration value of the air compressor, a duty ratio calibration value of the hydrogen ejector, a second rotating speed calibration value of the water pump, and an opening degree calibration value of the expander;

[0014] According to the preset shutdown state calibration value, control the air compressor, the hydrogen ejector, the water pump, and the expander to purge the liquid water inside the anode and cathode flow channels.

[0015] In some embodiments, the control of the air compressor and the preset air valves of the air unit when it is determined that the rotating speed data meets a preset rotating speed threshold value comprises:

[0016] When it is determined that the difference between the rotating speed data and a preset minimum rotating speed is less than a preset deviation threshold value, shut down the air compressor and each of the preset air valves.

[0017] In some embodiments, the control of the boost converter to enter the discharge mode according to the position information of the preset actuators and the single cell voltage data of the preset fuel cell comprises:

[0018] Detect the position information of each of the preset actuators;

[0019] Detect the single cell voltage data of each single cell fuel cell of the preset fuel cell, to determine a minimum single cell voltage according to the single cell voltage data;

[0020] When it is determined according to the position information that the preset actuators reach a target position or that the minimum single cell voltage is less than a preset minimum voltage threshold value, set the stack target current to zero and control the boost converter to enter the discharge mode.

[0021] In some embodiments, the method further comprises:

[0022] dynamically monitoring the single cell voltage data of the preset fuel cell to determine a highest single cell voltage according to the single cell voltage data;

[0023] controlling the boost converter to enter a standby mode and to shut down the hydrogen unit and the air unit when it is determined that the highest single cell voltage of the preset fuel cell is less than a preset highest voltage threshold;

[0024] setting a zero to an actuator control instruction of the hydrogen unit and disabling each hydrogen module actuator of the hydrogen unit and each air module actuator of the air unit.

[0025] In some embodiments, the method further comprises:

[0026] dynamically monitoring inlet stack water temperature data of the preset fuel cell;

[0027] shutting down each thermal management module actuator of the thermal management unit and disconnecting an output side relay of the boost converter when it is determined that the inlet stack water temperature data satisfies a preset temperature threshold.

[0028] In some embodiments, the method further comprises:

[0029] shutting down the hydrogen unit and the air unit and opening each inlet and outlet stack valve of the preset fuel cell when it is determined that a preset emergency stop instruction is received;

[0030] dynamically detecting cathode and anode pressures of the preset fuel cell to determine whether the cathode and anode pressures are less than a preset pressure threshold;

[0031] shutting down each inlet and outlet stack valve and disabling the inlet and outlet stack valve when it is determined that the cathode and anode pressures are less than the preset pressure threshold;

[0032] dynamically detecting inlet and outlet stack water temperature of the preset fuel cell to determine whether the inlet and outlet stack water temperature is less than a preset inlet and outlet stack temperature threshold;

[0033] shutting down each thermal management module actuator of the thermal management unit and disconnecting a high voltage side relay of the boost converter when it is determined that the inlet and outlet stack water temperature is less than the preset inlet and outlet stack temperature threshold.

[0034] To achieve the above object, another aspect of the embodiment of the present application provides a multi-stack hydrogen fuel cell shutdown system, which comprises:

[0035] A first module is configured to set a stack target current of a preset fuel cell as a first expected current according to a preset shutdown instruction, and control a preset actuator according to a preset shutdown state calibration value, so as to control the preset fuel cell to enter a shutdown preparation phase; wherein the preset fuel cell comprises a multi-stack hydrogen fuel cell, and the multi-stack hydrogen fuel cell comprises an air unit, a thermal management unit and a hydrogen unit;

[0036] A second module is configured to set the stack target current as a second expected current and dynamically detect a rotating speed data of an air compressor when it is determined that the preset fuel cell enters the shutdown preparation phase;

[0037] A third module is configured to close the air compressor and a preset air valve of the air unit when it is determined that the rotating speed data meets a preset rotating speed threshold value;

[0038] A fourth module is configured to control a boost converter to enter a discharge mode according to position information of the preset actuator and cell voltage data of the preset fuel cell;

[0039] A fifth module is configured to dynamically monitor the cell voltage data, so as to control the boost converter to enter a standby mode according to the cell voltage data and a preset cell voltage threshold value, and close the hydrogen unit and the air unit;

[0040] A sixth module is configured to close the thermal management unit when it is determined that a fuel cell temperature of the preset fuel cell meets a preset temperature threshold value.

[0041] To achieve the above object, another aspect of the embodiment of the present application provides an electronic device, which comprises:

[0042] at least one processor;

[0043] at least one memory configured to store at least one program;

[0044] When the at least one program is executed by the at least one processor, the at least one processor implements the above method.

[0045] To achieve the above object, another aspect of the embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the above method.

[0046] The embodiments of the present application at least have the following beneficial effects: the present application provides a multi-stack hydrogen fuel cell shutdown method, system, electronic device and storage medium, which sets the stack target current of the preset fuel cell to a first expected current according to a preset shutdown quality, and controls the preset actuator according to a preset shutdown state calibration value, so as to control the preset fuel cell to enter a shutdown preparation stage. Correspondingly, in the embodiments of the present application, the preset fuel cell includes a multi-stack hydrogen fuel cell, and the multi-stack fuel cell includes an air unit, a thermal management unit and a hydrogen unit. Then, after determining that the preset fuel cell enters the shutdown preparation stage, the embodiments of the present application set the stack target current to a second expected current, and dynamically detect the speed data of the air compressor. Correspondingly, when it is determined that the speed data meets a preset speed threshold, the embodiments of the present application close the preset air valve of the air compressor and the air unit. Then, the embodiments of the present application control the boost converter to enter a discharge mode according to the position information of the preset actuator and the single cell voltage data of the preset fuel cell. Then, the embodiments of the present application dynamically detect the single cell voltage data, so as to control the boost converter to enter a standby mode according to the single cell voltage data and a preset single cell voltage threshold, and close the hydrogen unit. Finally, when it is determined that the fuel cell temperature of the preset fuel cell meets a preset temperature threshold, the preset thermal management unit is closed, and the shutdown of the multi-stack hydrogen fuel cell is completed. It is easy to understand that the multi-stack hydrogen fuel cell shutdown method provided by the embodiments of the present application has clear logic and simple operation. Through dynamically monitoring the speed data, position information, single cell voltage data and fuel cell temperature, the embodiments of the present application realize the cooperative control between the preset controllers, effectively improve the shutdown efficiency. Meanwhile, the embodiments of the present application sequentially close the air unit, the hydrogen unit and the thermal management unit, wherein the closing process of the air unit is divided into two step stages for corresponding discharge mode processing, which improves the discharge speed and relieves the damage problems of the battery, such as reverse polarity and high potential, and effectively improves the shutdown efficiency and stability of the multi-stack hydrogen fuel cell, and effectively relieves the problems of system performance decline and service life attenuation. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 FIG. 1 is a flow diagram of a multi-stack hydrogen fuel cell shutdown method provided by the embodiments of the present application;

[0048] Figure 2 FIG. 2 is a structural diagram of a multi-stack hydrogen fuel cell system provided by the embodiments of the present application;

[0049] Figure 3 FIG. 3 is a flow diagram of an emergency stop method of a multi-stack hydrogen fuel cell provided by the embodiments of the present application;

[0050] Figure 4 FIG. 4 is a whole flow diagram of a multi-stack hydrogen fuel cell shutdown method provided by the embodiments of the present application;

[0051] Figure 5is a structural schematic diagram of a multi-stack hydrogen fuel cell shutdown system provided by an embodiment of the present application.

[0052] Figure 6 is a hardware structure schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all the implementations consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0054] It can be understood that the terms "first", "second", and the like used in the present application can be used herein to describe various concepts, but unless specifically stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "when" or "in response to determining".

[0055] The terms "at least one", "multiple", "each", "any" and the like used in the present application include one, two or more than two, multiple includes two or more than two, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0057] Before the embodiments of the present application are described in detail, first, some nouns and terms involved in the embodiments of the present application are described, and the nouns and terms involved in the embodiments of the present application are applicable to the following explanations.

[0058] Hydrogen fuel cell: A device that generates electricity by reacting hydrogen and oxygen, its principle is the reverse reaction of electrolysis of water. Accordingly, when the hydrogen fuel cell works, hydrogen and oxygen are supplied to the anode and cathode of the hydrogen fuel cell respectively, hydrogen diffuses outward through the anode, reacts with the dielectric to release electrons, the electrons pass through the external load to the cathode, and combine with the oxygen at the cathode to generate water and release electrical energy.

[0059] Multi-stack hydrogen fuel cell: Refers to a system composed of multiple hydrogen fuel cell stacks, used to improve the overall power output and efficiency. Each fuel cell stack works independently, and the greater power output is obtained through the cooperation of multiple fuel cell stacks.

[0060] Hydrogen fuel cell is a power generation device based on electrochemical theory, which can directly convert the chemical energy in hydrogen and oxygen into electrical energy, output to energy storage device or electrical appliances, and become a new type of power source after internal combustion engine and lithium battery. With the widespread attention of hydrogen fuel cell in heavy trucks, distributed power generation, rail transit and other fields, the power demand of single hydrogen fuel cell system is gradually increasing. In order to meet the demand of high-power energy supply, while avoiding the technical problems of poor durability, high system cost and so on, it is necessary to parallel multiple single hydrogen fuel cells to form a multi-stack working model, and improve the service life and working efficiency of the system. In related technologies, during the shutdown process of multi-stack hydrogen fuel cell, the performance of hydrogen fuel cell system is easily reduced and the service life is easily attenuated. For example, due to the existence of start-stop, variable load and other working conditions, the durability and reliability of hydrogen fuel cell system are put forward more stringent requirements. Especially at shutdown, hydrogen-air interface is easy to produce in the anode, and residual hydrogen gas is easy to react with air on the cathode side to form open circuit voltage, corrode the catalyst carrier, cause the performance of hydrogen fuel cell system to be reduced and the service life to be attenuated. In addition, due to the complex structure of multi-stack hydrogen fuel cell, there is a certain coupling between each actuator during shutdown process, it is difficult to realize stable and reliable shutdown control, and the shutdown efficiency is low.

[0061] Therefore, the application provides a multi-stack hydrogen fuel cell shutdown method, system, electronic device and storage medium. The method sets the stack target current of a preset fuel cell as a first expected current according to a preset shutdown quality, and controls a preset actuator according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation stage. Accordingly, the preset fuel cell in the application includes a multi-stack hydrogen fuel cell, and the multi-stack fuel cell includes an air unit, a thermal management unit and a hydrogen unit. Then, when it is determined that the preset fuel cell enters the shutdown preparation stage, the application sets the stack target current as a second expected current and dynamically detects the speed data of the air compressor. Accordingly, when it is determined that the speed data meets a preset speed threshold, the application closes the preset air valve of the air compressor and the air unit. Then, the application controls the boost converter to enter a discharge mode according to the position information of the preset actuator and the single cell voltage data of the preset fuel cell. Then, the application dynamically detects the single cell voltage data to control the boost converter to enter a standby mode according to the single cell voltage data and a preset single cell voltage threshold, and closes the hydrogen unit. Finally, when it is determined that the fuel cell temperature of the preset fuel cell meets a preset temperature threshold, the preset thermal management unit is closed, and the shutdown of the multi-stack hydrogen fuel cell is completed, which can effectively improve the shutdown efficiency and stability of the multi-stack hydrogen fuel cell, and effectively alleviate the problems of system performance degradation and service life attenuation.

[0062] The multi-stack hydrogen fuel cell shutdown method provided by the application is related to the technical field of hydrogen fuel cells. The multi-stack hydrogen fuel cell shutdown method provided by the application can be applied to a terminal, can be applied to a server, and can also be software running in a terminal or a server. In some embodiments, the terminal can be a smart phone, a tablet computer, a notebook computer, a desktop computer, a smart speaker, a smart watch, a vehicle-mounted terminal, and the like, but is not limited thereto. The server can be configured as a standalone physical server, a server cluster composed of multiple physical servers, or a distributed system, and can also be configured as a cloud server providing basic cloud computing services such as cloud service, cloud database, cloud computing, cloud function, cloud storage, network service, cloud communication, middleware service, domain name service, security service, CDN, and big data and artificial intelligence platform. The server can also be a node server in a blockchain network. The software can be an application that implements the multi-stack hydrogen fuel cell shutdown method, and the like, but is not limited to the above forms.

[0063] The application is operable in a multitude of general or special computer system environments or configurations. Examples of well known computing systems, environments, and / or configurations that can be suitable for use with the application include, but are not limited to, personal computers, server computers, handheld or laptop devices, tablet devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like. The application can be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, and the like, that perform particular tasks or implement particular abstract data types. The application can also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules can be located in local and remote computer storage media including memory storage devices.

[0064] Figure 1 is an optional flowchart of a method for shutting down a multi-stack hydrogen fuel cell provided by an embodiment of the application, Figure 1 The method in the above can include, but is not limited to, steps S110 to S160.

[0065] Step S110: According to a preset shutdown instruction, set the stack target current of a preset fuel cell to a first expected current, and control the preset actuator according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation phase. Wherein, the preset fuel cell includes a multi-stack hydrogen fuel cell, and the multi-stack hydrogen fuel cell includes an air unit, a thermal management unit and a hydrogen unit.

[0066] Step S120: When it is determined that the preset fuel cell enters the shutdown preparation phase, set the stack target current to a second expected current, and dynamically detect the rotating speed data of the air compressor.

[0067] Step S130: When it is determined that the rotating speed data meets a preset rotating speed threshold, close the preset air valve of the air compressor and the air unit.

[0068] Step S140: According to the position information of the preset actuator and the single cell voltage data of the preset fuel cell, control the boost converter to enter a discharge mode.

[0069] Step S150: Dynamically monitor the single cell voltage data, so as to control the boost converter to enter a standby mode according to the single cell voltage data and a preset single cell voltage threshold, and close the hydrogen unit and the air unit.

[0070] Step S160: When it is determined that the fuel cell temperature of the preset fuel cell meets a preset temperature threshold, close the thermal management unit.

[0071] In the working process of the embodiment, the preset fuel cell is first set to a first desired current according to a preset shutdown instruction, and the preset actuator is controlled according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation stage. Specifically, the preset fuel cell in the embodiment includes a multi-stack hydrogen fuel cell, that is, a battery system composed of multiple hydrogen fuel cell stacks. Accordingly, the multi-stack hydrogen fuel cell in the embodiment includes an air unit (air system), a thermal management unit (thermal management system), a hydrogen unit (hydrogen system), a stack, and a control system. For example, with reference to Figure 2The multi-stack hydrogen fuel cell system in the embodiment of the present application comprises a multi-stack system 240, a hydrogen system 220, an air system 210, a thermal management system 230, and a control system 250. The multi-stack system 240 comprises three single fuel cells, and the three single hydrogen fuel cells are connected in parallel to improve the output power of the stack. The hydrogen system comprises a hydrogen inlet pressure stabilizing chamber 222, an ejector group 223 (comprising a plurality of ejectors), an eductor group 224 (comprising a plurality of eductors), and various valves and sensors, such as an inlet stack stop valve group 225 (comprising a plurality of stop valves), an outlet stack stop valve group 226 (comprising a plurality of stop valves), and a hydrogen and water discharge valve 221. Hydrogen first enters the hydrogen inlet pressure stabilizing chamber 222 to adjust the pressure, and then enters the independent hydrogen inlet pipeline of each single stack. The ejector and the eductor on each pipeline are responsible for adjusting the hydrogen inlet amount and the circulation rate, and the hydrogen outlet is adjusted by the hydrogen and water discharge valve 221. The air system 210 comprises an air compressor 211, an expander 212, an intercooler 213, a humidifier 214, and various valves and sensors, such as an inlet stack stop valve 215 and an outlet stack stop valve 216. The air compressor 211 is responsible for adjusting the inlet air flow and pressure of the stack, the intercooler 213 and the humidifier 214 are responsible for controlling the temperature and humidity of the inlet air of the stack, and the expander 212 is responsible for adjusting the exhaust back pressure and recovering part of the exhaust energy. The thermal management system 230 comprises a radiator 231, a PTC thermal management module 233, an electronic thermostat 232, and various valves and sensors. Accordingly, the thermal management system 230 is a liquid cooling system, adopts a "large circulation + small circulation" mode, the electronic thermostat 232 is responsible for distributing the large and small circulation cooling liquids according to the current temperature, and the PTC thermal management module 233 is installed on the small circulation loop and is mainly responsible for helping the stack to warm up during low-temperature cold start to speed up the start-up time. The radiator 231 is installed on the large circulation loop and is responsible for cooling the stack and the inlet air of the stack. The control system 250 comprises a stack system controller (FCU), a voltage inspector (CVM), a boost converter (DCF), and other actuators and sensors for assisting the normal operation of the fuel cell system. The CVM and the DCF monitor the signals such as the pressure, temperature, voltage, and current of the stack in real time, and maintain the actuators to operate stably at the target parameters, so that the output current of the fuel cell follows the target current at a faster speed under the current state, and ensures the stability of the system during operation or shutdown.

[0072] Accordingly, when the preset fuel cell (multi-stack hydrogen fuel cell) in operation receives a preset shutdown instruction, the embodiment of the present application first sets the stack target current to a first desired current. For example, the embodiment of the present application reduces the stack target current to an idle current of 20 A. At the same time, the embodiment of the present application controls the preset actuators to act according to the preset shutdown state calibration value, i.e. the preset shutdown state calibration value, so as to make the preset fuel cell enter the shutdown preparation stage. In the embodiment of the present application, the preset actuators include each actuator in the multi-stack hydrogen fuel cell. Then, the embodiment of the present application determines whether the preset fuel cell has entered the shutdown preparation stage. When it is determined that the preset fuel cell has entered the shutdown preparation stage, the embodiment of the present application sets the cell target current to a second desired current and dynamically detects the rotation speed data of the air compressor. Specifically, in the embodiment of the present application, whether each preset actuator reaches the corresponding preset shutdown state calibration value and whether the stack current is maintained at the first desired current are analyzed to determine whether the preset fuel cell enters the shutdown preparation stage. Accordingly, when the preset fuel cell enters the shutdown preparation stage, it means that the preset fuel cell has prepared for the subsequent shutdown action, and the embodiment of the present application further reduces the current, i.e. reduces the stack target current to the second desired current. For example, the embodiment of the present application further sets the stack target current to a shutdown current of 10 A to reduce the current output at a slower speed. At the same time, the embodiment of the present application detects the rotation speed data of the air compressor in the air unit in real time to determine whether the air compressor meets the preset rotation speed threshold. Further, when it is determined that the rotation speed data of the air compressor meets the preset rotation speed threshold, the embodiment of the present application closes the preset air valve of the air compressor and the air unit. Specifically, in the embodiment of the present application, the preset rotation speed threshold is a preset air compressor rotation speed threshold. Accordingly, the embodiment of the present application monitors whether the rotation speed data of the air compressor is maintained at the preset rotation speed threshold, such as 30000 rpm, and when it is determined that the rotation speed of the air compressor is maintained at the preset rotation speed threshold, the air compressor is closed, and each preset air valve, such as a stop valve, of the air unit is closed to further reduce the gas flow in the system.

[0073] Further, the embodiment of the present application controls the boost converter to enter the discharging mode according to the position information of the preset actuators and the single cell voltage data of the preset fuel cell. Specifically, the position information of the preset actuators in the embodiment of the present application refers to the position data in the adjustment process of each preset actuator (such as an air compressor, a stop valve, etc.), such as the opening degree of a valve. Correspondingly, the single cell voltage data refers to the working voltage of a single battery cell in the preset fuel cell. The embodiment of the present application judges whether each component is ready for the next stage by checking the position information of each preset actuator and the single cell voltage data of the preset fuel cell. Correspondingly, when it is determined that the position information of each preset actuator and the single cell voltage data meet the preset conditions, the embodiment of the present application controls the boost converter (DCF) to enter the discharging mode to release the stored electric energy. Then, the embodiment of the present application dynamically monitors the single cell voltage data to control the boost converter to enter the standby mode and shut down the hydrogen unit and the air unit according to the single cell voltage data and the preset single cell voltage threshold. Specifically, after the boost converter enters the discharging mode, the embodiment of the present application detects the single cell voltage data of the preset fuel cell in real time to judge whether the electric energy in the boost converter is fully released, thereby relieving the problem of possible current or voltage after shutdown. Correspondingly, the embodiment of the present application judges whether the electric energy in the boost converter is fully released by the detected single cell voltage data and the preset single cell voltage threshold, such as whether the single cell voltage data is less than the preset single cell voltage threshold, and then controls the boost converter to enter the standby mode from the discharging mode and shut down the hydrogen unit and the air unit.

[0074] Finally, the embodiment of the present application judges whether the preset fuel cell meets the temperature condition for shutdown according to the fuel cell temperature of the preset fuel cell. When it is determined that the fuel temperature of the preset fuel cell meets the preset temperature threshold, the embodiment of the present application shuts down the thermal management unit to complete the shutdown of the multiple stacks of hydrogen fuel cells. Specifically, the embodiment of the present application judges whether the temperature of the preset fuel cell after shutdown is within the safe temperature range by judging whether the fuel cell temperature meets the preset temperature threshold. When it is determined that the fuel cell temperature meets the preset temperature threshold, the embodiment of the present application shuts down the thermal management unit to complete the entire shutdown process.

[0075] In some embodiments of the present application, the preset actuators are controlled according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation stage, including but not limited to the following steps:

[0076] The preset shutdown state calibration value is set. The preset shutdown state calibration value includes a first speed calibration value of an air compressor, a duty ratio calibration value of a hydrogen ejector, a second speed calibration value of a water pump, and an opening degree calibration value of an expander.

[0077] The air compressor, the hydrogen ejector, the water pump and the expander are controlled according to the preset shutdown state calibration value, so as to blow the liquid water in the cathode and anode flow channels.

[0078] In the embodiment, the preset shutdown state calibration value is first set, and then the air compressor, the hydrogen ejector, the water pump and the expander are controlled according to the preset shutdown state calibration value, so as to blow the liquid water in the cathode and anode flow channels. Specifically, the preset shutdown state calibration value includes a first rotation speed calibration value of the air compressor, a duty cycle calibration value of the hydrogen ejector, a second rotation speed calibration value of the water pump and an opening degree calibration value of the expander. For example, the shutdown state rotation speed calibration value (the first rotation speed calibration value) of the air compressor is 37500 rpm, the opening degree calibration value of the expander in the shutdown state is 55%, the duty cycle calibration value of the hydrogen ejector in the shutdown state is 20%, and the shutdown state rotation speed calibration value (the second rotation speed calibration value) of the water pump is 2000 rpm. Then, the air compressor is controlled to work at the first rotation speed calibration value, the duty cycle of the hydrogen ejector is controlled to be the preset duty cycle calibration value, the rotation speed of the water pump is controlled to be the second rotation speed calibration value, and the opening degree of the expander is controlled to be the opening degree calibration value, so as to realize the small-current large-flow state, complete the blowing of the liquid water adsorbed in the cathode and anode flow channels in the shutdown stage, quickly and effectively blow the liquid water adsorbed in the cathode and anode flow channels in the shutdown process, reduce the occurrence of water flooding, and thus protect the performance and service life of the fuel cell stack.

[0079] In some embodiments of the application, when it is determined that the rotation speed data meets the preset rotation speed threshold value, the preset air valves of the air compressor and the air unit are closed, including but not limited to the following steps:

[0080] When it is determined that the difference between the rotation speed data and the preset minimum rotation speed is less than the preset deviation threshold value, the air compressor and each preset air valve are closed.

[0081] In the embodiment, the air compressor is determined to meet the preset rotating speed threshold by judging whether the difference between the rotating speed data of the air compressor and the preset minimum rotating speed is less than the preset deviation threshold. Specifically, the preset minimum rotating speed in the embodiment refers to the minimum rotating speed threshold maintained by the air compressor, such as 30000 rpm. Correspondingly, the preset deviation threshold refers to the deviation range threshold of the rotating speed of the air compressor and the preset minimum rotating speed, such as ±200 rpm. The controller of the air compressor receives the target rotating speed set by the controller, that is, the preset minimum rotating speed, and feeds back the actual rotating speed to the controller. When the controller receives that the actual rotating speed reaches the target rotating speed (for example, the maximum deviation is not more than 200 rpm), the air compressor reaches the target rotating speed. Correspondingly, the actual rotating speed of the air compressor is monitored in the embodiment. When it is determined that the actual rotating speed of the air compressor drops to the deviation range (±200 rpm) of the preset minimum rotating speed, the valves in the air compressor and the air unit are closed.

[0082] In some embodiments of the application, the boost converter is controlled to enter the discharging mode according to the position information of the preset actuators and the single cell voltage data of the preset fuel cell, including but not limited to the following steps:

[0083] The position information of each preset actuator is detected.

[0084] The single cell voltage data of each single cell of the preset fuel cell is detected to determine the minimum single cell voltage according to the single cell voltage data.

[0085] When it is determined according to the position information that the preset actuator reaches the target position or that the minimum single cell voltage is less than the preset minimum voltage threshold, the stack target current is set to zero, and the boost converter is controlled to enter the discharging mode.

[0086] In the embodiment, the position information of each preset actuator is first detected, and the single cell voltage data of each single cell of the preset fuel cell is detected to determine the minimum single cell voltage, and then the boost converter is controlled to enter the discharging mode according to the position information or the minimum single cell voltage. Specifically, the position information of each actuator in the preset fuel cell is first detected in the embodiment to determine whether the preset actuator has dropped to the target position. At the same time, the single cell voltage data of each single cell is detected in the embodiment to determine the minimum single cell voltage from each single cell voltage data, that is, the minimum voltage value of each single cell, to determine whether the minimum single cell voltage value is lower than the preset minimum voltage threshold. Correspondingly, when it is determined that each actuator has dropped to the corresponding target position or that the minimum single cell voltage has dropped below the preset minimum voltage threshold, such as less than 550 mV, it indicates that each component is ready for the next stage. At this time, the stack target current is set to 0 in the embodiment, and the boost converter is controlled to enter the discharging mode to start releasing the stored electric energy.

[0087] In some embodiments of the present application, the single cell voltage data is dynamically monitored to control the boost converter to enter a standby mode and to shut down the hydrogen unit and the air unit according to the single cell voltage data and preset single cell voltage thresholds, including but not limited to the following steps:

[0088] The single cell voltage data of each single cell of the preset fuel cell is dynamically monitored to determine a highest single cell voltage according to the single cell voltage data.

[0089] When it is determined that the highest single cell voltage of the preset fuel cell is less than a preset highest voltage threshold, the boost converter is controlled to enter a standby mode and an input side relay of the boost converter is shut down.

[0090] An actuator control instruction of the hydrogen unit is set to zero and each hydrogen module actuator of the hydrogen unit and each air module actuator of the air unit are disabled.

[0091] In the embodiment, the voltage data of each single fuel cell of the preset fuel cell is first dynamically monitored to determine the highest single cell voltage according to the single cell voltage data, and then it is judged whether the highest single cell voltage is less than the preset highest voltage threshold. When it is determined that the highest single cell voltage is less than the preset highest voltage threshold, the boost converter is controlled to enter the standby mode, and the input side relay of the boost converter is turned off. Specifically, the highest single cell voltage in the embodiment refers to the maximum value of the single cell voltage data of each single fuel cell. Accordingly, the highest voltage value of the single fuel cell, i.e. the highest single cell voltage, is obtained by monitoring each single fuel cell in the preset fuel cell in real time. Then, it is judged whether the monitored highest single cell voltage is reduced to the target value (i.e. the preset highest voltage threshold). When it is determined that the highest single cell voltage is less than the preset highest voltage threshold, such as 150mV, it indicates that the electrical energy of the boost converter has been released sufficiently, at which time the boost converter is controlled to enter the standby mode, and the input side relay of the boost converter is turned off to cut off the power supply of the boost converter. Then, the actuator control instruction of the hydrogen unit is set to 0, and each hydrogen module actuator of the hydrogen unit and each air module actuator of the air unit are disabled. Specifically, the hydrogen module actuator in the embodiment refers to each actuator in the hydrogen unit, and the air module actuator refers to each actuator in the air unit. Accordingly, the actuator control instruction of each actuator (hydrogen module actuator) of the hydrogen unit is set to 0, i.e. the control signal of all actuators (such as valves, pumps, etc.) in the hydrogen unit is zeroed or set to the closed / stop state. Then, all actuators (such as valves, water pumps, etc.) responsible for controlling or executing specific functions in the hydrogen unit and the air unit are set to the inactive or invalid state, so that after the fuel cell stack is shut down, hydrogen and air will not continue to flow into the system, thereby alleviating the problems of hydrogen leakage or air mixing, etc.

[0092] In some embodiments of the application, when it is determined that the fuel cell temperature of the preset fuel cell meets the preset temperature threshold, the heat management unit is turned off, including but not limited to the following steps:

[0093] The water temperature data into the stack of the preset fuel cell is dynamically monitored.

[0094] When it is determined that the water temperature data into the stack meets the preset temperature threshold, each heat management module actuator of the heat management unit is turned off, and the output side relay of the boost converter is disconnected.

[0095] In the embodiment, the method for shutting down the multi-stack hydrogen fuel cell system comprises the following steps: dynamically detecting the water temperature data of the preset fuel cell stack to determine whether the water temperature data meets a preset temperature threshold; and when it is determined that the water temperature data meets the preset temperature threshold, closing each thermal management module actuator of the thermal management unit and disconnecting the output side relay of the boost converter. Specifically, in order to avoid drying the proton exchange membrane after the system is shut down, the cooling system is maintained to operate to make the temperature reach a safe range after the system stops power output. The preset temperature threshold is determined by the fuel cell stack. In the embodiment, the water temperature data of the preset fuel cell stack refers to the temperature of the cooling water entering the preset fuel cell stack. Accordingly, the method for shutting down the multi-stack hydrogen fuel cell system comprises the following steps: dynamically detecting the water temperature data of the preset fuel cell stack to determine whether the preset fuel cell stack has been sufficiently cooled; and when it is determined that the water temperature data meets the preset temperature threshold, for example, the water temperature data is less than 65 degrees, it is indicated that the temperature of the preset fuel cell stack is within a safe temperature range, and each thermal management module actuator of the thermal management unit is closed, and the thermal management unit stops working. At the same time, the output side relay of the boost converter is disconnected, and the shutdown process of the multi-stack hydrogen fuel cell system is completed.

[0096] In some embodiments of the present application, the method for shutting down the multi-stack hydrogen fuel cell system further comprises the following steps:

[0097] When it is determined that the preset emergency stop instruction is received, the hydrogen unit and the air unit are closed, and each inlet and outlet valve of the preset fuel cell stack is opened.

[0098] The anode and cathode pressures of the preset fuel cell stack are dynamically detected to determine whether the anode and cathode pressures are less than a preset pressure threshold.

[0099] When it is determined that the anode and cathode pressures are less than the preset pressure threshold, each inlet and outlet valve is closed, and the inlet and outlet valves are disabled.

[0100] The inlet and outlet water temperatures of the preset fuel cell stack are dynamically detected to determine whether the inlet and outlet water temperatures are less than a preset inlet and outlet temperature threshold.

[0101] When it is determined that the inlet and outlet water temperatures are less than the preset inlet and outlet temperature threshold, each thermal management module actuator of the thermal management unit is closed, and the high-voltage side relay of the boost converter is disconnected.

[0102] In this specific embodiment, when the preset fuel cell receives a preset emergency stop command, the present invention shuts down the hydrogen unit and the air unit, and opens the various inlet and outlet valves of the preset fuel cell. Specifically, during the shutdown process of the preset fuel cell, shutdown anomalies may occur, such as the air compressor speed not dropping to the target speed within a preset time period, the preset actuators not dropping to the target position or the individual cell voltage not dropping below the target individual cell voltage within a preset time period, or the output current and individual cell voltage not dropping below the target value within a preset time period. Accordingly, when a shutdown anomaly is determined to occur, the present invention executes the corresponding emergency stop procedure to complete the emergency shutdown, mitigating the problem of irreversible damage to the fuel cell stack and system caused by sudden problems during the shutdown process, and effectively improving the stability and safety of the system shutdown. Figure 3 As shown, when the preset fuel cell receives a preset emergency stop command, that is, when a sudden problem occurs during the shutdown process, this embodiment of the invention first shuts down all actuators of the air unit and the hydrogen unit, and at the same time opens all the inlet and outlet valves of the preset fuel cell, that is, opens all the valves inlet and outlet of the preset fuel cell to release the pressure inside the stack.

[0103] Next, this embodiment of the invention dynamically detects the anode and cathode pressures of a preset fuel cell to determine whether the anode and cathode pressures are less than a preset pressure threshold. When it is determined that the anode and cathode pressures are less than the preset pressure threshold, this embodiment of the invention closes all inlet and outlet valves and disables them. Specifically, in this embodiment of the invention, the anode and cathode pressures refer to the pressure values ​​of the anode and cathode in the preset fuel cell. This embodiment of the invention monitors the anode and cathode pressures in real time to determine whether the pressure values ​​of the anode and cathode of the fuel cell stack have dropped to a safe range, that is, to determine whether the anode and cathode voltages are less than the preset pressure threshold. When the anode and cathode voltages are less than the preset pressure threshold, it indicates that the pressure values ​​of the cathode and anode of the fuel cell stack have dropped to a safe range. Therefore, this embodiment of the invention closes all inlet and outlet valves and disables them to reduce fluid flow within the preset fuel cell.

[0104] Furthermore, this embodiment of the invention dynamically detects the inlet and outlet water temperatures of a preset fuel cell to determine whether these temperatures are lower than preset inlet and outlet temperature thresholds. When it is determined that the inlet and outlet water temperatures are lower than the preset inlet and outlet temperature thresholds, this embodiment of the invention shuts down the actuators of each thermal management module of the thermal management unit and disconnects the high-voltage side relay of the boost converter. Specifically, since the preset fuel cell requires temperature management by the thermal management unit during operation to avoid overheating, this embodiment of the invention monitors the inlet and outlet cooling water temperatures of the preset fuel cell, i.e., the inlet and outlet water temperatures, to determine whether the temperature of the preset fuel cell has dropped to a preset safe range, i.e., the preset inlet and outlet temperature thresholds. When the inlet and outlet water temperatures are detected to be lower than the preset inlet and outlet temperature thresholds, it indicates that the temperature of the fuel cell stack is already within a safe range. At this time, this embodiment of the invention shuts down the thermal management unit, shuts down the actuators of each thermal management module, and stops thermal management activities. Simultaneously, this embodiment of the invention disconnects the high-voltage side relay of the boost converter, cutting off the electrical connection between the boost converter and the high-voltage source, thereby achieving an emergency shutdown.

[0105] The following section provides a detailed description and explanation of the solutions in this embodiment of the invention, using specific shutdown scenarios for multi-stack hydrogen fuel cells as examples:

[0106] For example, such as Figure 4 As shown, in this embodiment of the invention, when a multi-stack fuel cell system in operation receives a preset shutdown command, the embodiment first reduces the preset target current of the fuel cell stack to the idle current of 20A, i.e., the first desired current, and controls components such as the air compressor, expander, hydrogen injector, and water pump to operate at their calibrated values ​​in the shutdown state. The system enters the initial stage of the shutdown module, i.e., the shutdown preparation stage. Next, the embodiment sets the target current of the fuel cell stack to the shutdown current of 10A, i.e., the second desired current. Simultaneously, the air compressor maintains a minimum speed, such as 30,000 rpm, the water pump follows suit by reducing its speed to maintain water pressure approximately 5 kPa lower than air pressure, and the hydrogen injector maintains a hydrogen-air pressure difference of 20 kPa at its target opening. Then, the embodiment determines whether the deviation of the actual air compressor speed from the target speed has decreased to within the minimum speed deviation range of 200 rpm. If so, the next shutdown command step is executed; otherwise, the system enters the emergency stop module, i.e., the emergency shutdown step is executed. Figure 3When it is determined that the air compressor is reduced to the target speed, the embodiment of the present application closes the air compressor and the valves of the air system, and determines whether the actuators are reduced to the target position or the minimum single voltage is reduced to the target value of 550mV or less. If yes, the next step of the shutdown instruction is executed, otherwise the emergency stop module is entered. Correspondingly, when it is determined that the actuators are reduced to the target position or the minimum single voltage is reduced to the target value of 550mV or less, the embodiment of the present application controls the boost converter (DCF) to enter the discharge mode, and sets the target current to 0. Then, it is determined whether the maximum single voltage is reduced to the target value of 150mV or less. If yes, the next step of the shutdown instruction is executed, otherwise the emergency stop module is entered to execute the emergency shutdown step. Correspondingly, when it is determined that the maximum single voltage is reduced to the target value of 150mV or less, the embodiment of the present application closes the DCF input side relay, cuts off the DCF, so that the DCF enters the standby mode, and disables the hydrogen air system actuators. Further, the embodiment of the present application determines whether the inlet stack water temperature is reduced to the target temperature value, such as 65 degrees Celsius. If yes, the embodiment of the present application closes the actuators of the thermal management system, and disconnects the DCF output side relay, to complete the shutdown process of the preset fuel cell.

[0107] It should be noted that in the two stages of the discharge process of the embodiment of the present application, in the first stage, due to the difference in response time of the components during the process of stopping air supply, the single cell still maintains a high potential because the cathode inlet and outlet of the stack are not completely closed. In order to quickly reduce the single voltage, the embodiment of the present application continues to use a small current to pull the load. At this time, the system is still in the power output stage, so the response state of the components and the protection condition of the minimum single voltage need to be considered. Correspondingly, in the second stage, the air supply has been completely cut off or the single voltage has been below the protection boundary, the embodiment of the present application discharges through the discharge mode of the DCF. This stage is executed by the discharge resistor inside the DCF, the discharge speed is slow, the risk is small, and therefore only the maximum single voltage below the set boundary needs to be determined. In the embodiment of the present application, the air system shutdown process is divided into two stages for different discharge modes, which improves the discharge speed of the system and prevents the damage of the battery from reverse polarity, high potential, etc. In addition, in the embodiment of the present application, the air, hydrogen and water three subsystems are closed in turn, the process is simple and clear, and there is no repeated action.

[0108] In addition, the embodiment of the present application takes the direct current power supply (DCF) input current as the main control parameter, controls the DCF input current to promote the shutdown process according to the data collected by each sensor in real time, realizes the cooperative control of each actuator in the shutdown process, and improves the shutdown efficiency. In the whole shutdown cycle, the embodiment of the present application first sets the DCF input current to an idle current, such as 20A, the hydrogen-air system actuator operates according to the shutdown state command parameter, the system enters a small current and large air volume state, and the hydrogen-air channel is purged for 20 seconds. Then, the embodiment of the present application sets the DCF input current to a shutdown current, such as 10A, the hydrogen-air actuator operates according to the idle state command parameter, the air compressor, the air inlet and outlet stack valve and the expander are closed after two seconds, the bypass valve is opened, and the hydrogen side actuator operates at the shutdown current. Next, the embodiment of the present application sets the DCF input current to 0 and enters the discharge state, consumes the oxygen partial pressure of the air side, reduces the single cell voltage, closes the bypass valve, and the hydrogen side actuator operates at the 0 current state control parameter. Further, the DCF is shut down, the input relay is closed, and the actuator of the hydrogen-air system is immediately disabled. Then, when the inlet and outlet stack water temperature reaches the target value, the heat management system actuator is closed and all actuators are disabled, the DCF high voltage side relay is closed, and the shutdown is completed.

[0109] Correspondingly, in the whole shutdown cycle of the multi-stack fuel cell system, when the system control module determines that a failure occurs in the shutdown process, the system will enter the emergency stop module, that is, the emergency shutdown is executed. After the system enters the emergency stop module, all the inlet and outlet stack valves of the hydrogen system and the air system are opened, all the actuators are closed, after the inlet and outlet stack water temperature drops to the safe range, all the valves and actuators are closed, the DCF disconnects the high voltage side relay, and the emergency shutdown is completed.

[0110] It is easy to understand that the multi-stack hydrogen fuel cell shutdown method provided by the embodiment of the present application has clear logic and simple operation. The DCF input current is controlled to promote the shutdown process, the pressure, temperature, voltage and other signals in the shutdown process of the stack are monitored according to the real-time data of each sensor, the cooperative control of each actuator in the shutdown process is realized, and the shutdown efficiency is improved. At the same time, the embodiment of the present application is provided with a fault emergency stop module, which avoids sudden problems in the shutdown process and causes irreversible damage to the stack and the system, effectively improves the stability and safety of the system shutdown. The embodiment of the present application can be used in a multi-stack system combined by multiple single cells, has universality and generality, has simple structure, clear logic, and is easy to realize, and can meet multiple application scenarios such as test development and engineering practice.

[0111] Please refer to Figure 5 The embodiment of the present application also provides a multi-stack hydrogen fuel cell shutdown system, which can realize the above-mentioned multi-stack hydrogen fuel cell shutdown method, and the system comprises:

[0112] The first module 310 is configured to set a stack target current of a preset fuel cell to a first expected current according to a preset shutdown instruction, and control a preset actuator according to a preset shutdown state calibration value, so as to control the preset fuel cell to enter a shutdown preparation phase. The preset fuel cell includes a multi-stack hydrogen fuel cell, and the multi-stack hydrogen fuel cell includes an air unit, a thermal management unit and a hydrogen unit.

[0113] The second module 320 is configured to set the stack target current to a second expected current when it is determined that the preset fuel cell enters the shutdown preparation phase, and dynamically detect a rotating speed data of an air compressor.

[0114] The third module 330 is configured to close the air compressor and a preset air valve of the air unit when it is determined that the rotating speed data meets a preset rotating speed threshold.

[0115] The fourth module 340 is configured to control a boost converter to enter a discharge mode according to position information of the preset actuator and cell voltage data of the preset fuel cell.

[0116] The fifth module 350 is configured to dynamically monitor the cell voltage data, so as to control the boost converter to enter a standby mode according to the cell voltage data and a preset cell voltage threshold, and close the hydrogen unit and the air unit.

[0117] The sixth module 360 is configured to close a thermal management unit when it is determined that a fuel cell temperature of the preset fuel cell meets a preset temperature threshold.

[0118] It can be understood that the contents in the above method embodiments are all applicable to the present system embodiment, the present system embodiment specifically implements the same functions as the above method embodiments, and achieves the same beneficial effects as the above method embodiments.

[0119] The present application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor implements the above multi-stack hydrogen fuel cell shutdown method when executing the computer program. The electronic device can be any intelligent terminal, such as a tablet computer or a vehicle-mounted computer.

[0120] It can be understood that the contents in the above method embodiments are all applicable to the present device embodiment, the present device embodiment specifically implements the same functions as the above method embodiments, and achieves the same beneficial effects as the above method embodiments.

[0121] Please refer to Figure 6 , Figure 6 The hardware structure of the electronic device of another embodiment is illustrated, and the electronic device includes:

[0122] The processor 410 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits, and is configured to execute related programs to implement the technical solutions provided by the embodiments of the present application.

[0123] The memory 420 can be implemented by a ROM (Read Only Memory), a static storage device, a dynamic storage device, or a RAM (Random Access Memory), and the like. The memory 420 can store an operating system and other application programs. When the technical solutions provided by the embodiments of the present application are implemented by software or firmware, the related program codes are stored in the memory 420 and are called and executed by the processor 410 to implement the method for shutting down the multi-stack hydrogen fuel cell.

[0124] The input / output interface 430 is configured to implement information input and output.

[0125] The communication interface 440 is configured to implement the communication interaction between the device and other devices. The communication can be implemented by a wired manner (for example, a USB, a network cable, or the like) or a wireless manner (for example, a mobile network, WIFI, Bluetooth, or the like).

[0126] The bus 450 is configured to transmit information between the components (for example, the processor 410, the memory 420, the input / output interface 430, and the communication interface 440) of the device.

[0127] The processor 410, the memory 420, the input / output interface 430, and the communication interface 440 are connected to each other by the bus 450 to realize the communication connection between the components in the device.

[0128] The embodiments of the present application further provide a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the method for shutting down the multi-stack hydrogen fuel cell.

[0129] It can be understood that the contents in the above method embodiments are applicable to the storage medium embodiments. The storage medium embodiments specifically implement the functions of the above method embodiments, and achieve the same beneficial effects as the above method embodiments.

[0130] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory can include a high-speed random access memory and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory can optionally include a memory disposed remotely from the processor, which can be connected to the processor through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0131] The embodiments described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0132] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and can include more or fewer steps than shown in the figures, or combine certain steps, or different steps.

[0133] The device embodiments described above are only schematic, and the units described as separate components can or can not be physically separate, i.e., can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0134] Those skilled in the art can understand that all or some of the steps in the above disclosed method, the functional modules / units in the system and the device can be implemented as software, firmware, hardware and their appropriate combinations.

[0135] The terms "first", "second", "third", "fourth" and the like used in the specification of the present application and the above-described drawings, if any, are used to distinguish similar objects, and do not necessarily have to describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0136] It should be understood that in the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases of only A, only B and A and B existing at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can represent a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0137] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0138] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes multiple instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program storage media.

[0139] The preferred embodiments of the embodiments of the present application are described above with reference to the accompanying drawings, but this does not limit the scope of the rights of the embodiments of the present application. Any modifications, equivalent replacements and improvements made by those skilled in the art without departing from the scope and essence of the embodiments of the present application shall be within the scope of the rights of the embodiments of the present application.

Claims

1. A method of shutting down a multi-stack hydrogen fuel cell, characterized by, The method comprises the following steps: According to the preset shutdown instruction, the stack target current of the preset fuel cell is set as a first expected current, and the preset actuator is controlled according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation phase; wherein the preset fuel cell comprises a plurality of hydrogen fuel cell stacks, and the plurality of hydrogen fuel cell stacks comprise an air unit, a thermal management unit and a hydrogen unit; When it is determined that the preset fuel cell enters the shutdown preparation phase, the stack target current is set as a second expected current, and the rotating speed data of an air compressor is dynamically detected; When it is determined that the rotating speed data meets a preset rotating speed threshold value, the air compressor and a preset air valve of the air unit are closed; According to the position information of the preset actuator and the single cell voltage data of the preset fuel cell, a boost converter is controlled to enter a discharge mode; The single cell voltage data is dynamically monitored to control the boost converter to enter a standby mode according to the single cell voltage data and a preset single cell voltage threshold value, and the hydrogen unit and the air unit are closed; When it is determined that the fuel cell temperature of the preset fuel cell meets a preset temperature threshold value, the thermal management unit is closed.

2. The method of claim 1, wherein, The preset actuator is controlled according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation phase, comprising: The preset shutdown state calibration value is set; wherein the preset shutdown state calibration value comprises a first rotating speed calibration value of the air compressor, a duty ratio calibration value of a hydrogen ejector, a second rotating speed calibration value of a water pump and an opening degree calibration value of a expander; According to the preset shutdown state calibration value, the air compressor, the hydrogen ejector, the water pump and the expander are controlled to blow off liquid water inside the anode and cathode flow channels.

3. The method of claim 1, wherein, When it is determined that the rotating speed data meets the preset rotating speed threshold value, the air compressor and the preset air valve of the air unit are closed, comprising: When it is determined that the difference between the rotating speed data and a preset minimum rotating speed is less than a preset deviation threshold value, the air compressor and each preset air valve are closed.

4. The method of claim 1, wherein, According to the position information of the preset actuator and the single cell voltage data of the preset fuel cell, the boost converter is controlled to enter the discharge mode, comprising: The position information of each preset actuator is detected; The single cell voltage data of each single cell of the preset fuel cell is detected to determine the lowest single cell voltage according to the single cell voltage data; When it is determined that the preset actuator reaches a target position according to the position information or that the lowest single cell voltage is less than a preset minimum voltage threshold value, the stack target current is set as zero, and the boost converter is controlled to enter the discharge mode.

5. The method of claim 1, wherein, The single cell voltage data of each single cell of the preset fuel cell is dynamically monitored to determine the highest single cell voltage according to the single cell voltage data; ​ determine that the highest single cell voltage of the preset fuel cell is less than a preset highest voltage threshold, control the boost converter to enter a standby mode, and close an input side relay of the boost converter; set a controller instruction of the hydrogen unit to zero, disable each hydrogen module controller of the hydrogen unit, and disable each air module controller of the air unit.

6. The method of claim 1, wherein, The method further comprises: dynamically monitor water temperature data of the preset fuel cell; determine that the water temperature data meets a preset temperature threshold, close each thermal management module controller of the thermal management unit, and disconnect an output side relay of the boost converter.

7. The method of claim 1, wherein, The method further comprises: determine that a preset emergency stop instruction is received, close the hydrogen unit and the air unit, and open each stack inlet and outlet valve of the preset fuel cell; dynamically detect cathode and anode pressures of the preset fuel cell to determine whether the cathode and anode pressures are less than a preset pressure threshold; determine that the cathode and anode pressures are less than the preset pressure threshold, close each stack inlet and outlet valve, and disable the stack inlet and outlet valve; dynamically detect water temperature of the stack inlet and outlet of the preset fuel cell to determine whether the water temperature of the stack inlet and outlet is less than a preset stack inlet and outlet temperature threshold; determine that the water temperature of the stack inlet and outlet is less than the preset stack inlet and outlet temperature threshold, close each thermal management module controller of the thermal management unit, and disconnect a high-voltage side relay of the boost converter.

8. A multi-stack hydrogen fuel cell shutdown system, characterized by, The system comprises: a first module configured to set a stack target current of a preset fuel cell to a first expected current according to a preset shutdown instruction, and control a preset controller according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation phase; wherein the preset fuel cell comprises a plurality of hydrogen fuel cells, and the plurality of hydrogen fuel cells comprise an air unit, a thermal management unit, and a hydrogen unit; a second module configured to, when it is determined that the preset fuel cell enters the shutdown preparation phase, set the stack target current to a second expected current, and dynamically detect rotation speed data of an air compressor; a third module configured to, when it is determined that the rotation speed data meets a preset rotation speed threshold, close the air compressor and a preset air valve of the air unit; a fourth module configured to control a boost converter to enter a discharge mode according to position information of the preset controller and single cell voltage data of the preset fuel cell; a fifth module configured to dynamically monitor the single cell voltage data to control the boost converter to enter a standby mode and close the hydrogen unit and the air unit according to the single cell voltage data and a preset single cell voltage threshold; a sixth module configured to, when it is determined that a fuel cell temperature of the preset fuel cell meets a preset temperature threshold, close the thermal management unit.

9. An electronic device, comprising: The system comprises: at least one processor; at least one memory configured to store at least one program; when the at least one program is executed by the at least one processor, the at least one processor implements the method of any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1-9. The computer program, which is executed by a processor, implements the method of any one of claims 1 to 7.

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