Multi-stack hydrogen fuel cell shutdown method and system, electronic equipment and storage medium

Abstract

The invention discloses a multi-stack hydrogen fuel cell shutdown method and system, electronic equipment and a storage medium, and the method comprises the steps: setting a 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 target current of the electric pile as a second expected current, and when the rotating speed data of the air compressor meets a preset rotating speed threshold value, closing the air compressor and a preset air valve of the air unit; controlling the boost converter to enter a discharge mode according to the preset actuator position information and the single voltage data; monitoring the single voltage data, controlling the boost converter to enter a standby mode according to the single voltage data, and closing the hydrogen unit and the air unit; when the temperature of the fuel cell meets the preset temperature threshold value, the heat management unit is closed. According to the embodiment of the invention, the shutdown efficiency and stability of the multi-stack hydrogen fuel cell can be improved, and the problems of system performance reduction and service life attenuation are relieved. The invention can be widely applied to the technical field of hydrogen fuel cells.

Description

Technical Field

[0001] The present application relates to the field of hydrogen fuel cell technology, and in particular to a method, system, electronic device and storage medium for shutting down a multi-stack hydrogen fuel cell. Background Art

[0002] A hydrogen fuel cell is a power generation device based on electrochemical theory that can directly convert the chemical energy in hydrogen and oxygen into electrical energy and output it to energy storage devices or electrical appliances, becoming a new type of power source after internal combustion engines and lithium batteries. As hydrogen fuel cells have received widespread attention in the fields of heavy trucks, distributed power generation, rail transit, etc., the power demand of single hydrogen fuel cell systems has gradually increased. In order to meet the demand for high-power energy supply while avoiding technical problems such as poor durability and high system cost, it is necessary to connect multiple single hydrogen fuel cells in parallel to form a multi-stack working model and improve the system's service life and work efficiency. In the related technology, during the shutdown process of multiple hydrogen fuel cells, it is easy to cause the performance of the hydrogen fuel cell system to decrease and the life to decay, and due to the complex structure of the multi-stack hydrogen fuel cells, it is difficult to achieve stable and reliable shutdown control, and the shutdown efficiency is low.

[0003] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to propose a method, system, electronic device and storage medium for shutting down multiple hydrogen fuel cells, which can effectively improve the shutdown efficiency and stability of multiple hydrogen fuel cells and effectively alleviate the problems of system performance degradation and life attenuation.

[0005] To achieve the above purpose, one aspect of an embodiment of the present application provides a method for shutting down a multi-stack hydrogen fuel cell, the method comprising the following steps:

[0006] According to a preset shutdown instruction, the target current of the stack of the preset fuel cell is set to a first expected current, and a preset actuator is controlled according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation stage; wherein the preset fuel cell includes a plurality of stacks of hydrogen fuel cells, and the plurality of stacks of hydrogen fuel cells include 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 to a second expected current, and the speed data of the air compressor is dynamically detected;

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

[0009] Controlling 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;

[0010] Dynamically monitor the 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 cell voltage data and a preset cell voltage threshold;

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

[0012] In some embodiments, controlling a preset actuator according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation phase includes:

[0013] Setting the preset shutdown state calibration value; wherein the preset shutdown state calibration value includes the first speed calibration value of the air compressor, the duty cycle calibration value of the hydrogen injector, the second speed calibration value of the water pump and the opening calibration value of the expander;

[0014] The air compressor, the hydrogen injector, the water pump and the expander are controlled accordingly according to the preset shutdown state calibration value to purge the liquid water inside the anode and cathode flow channels.

[0015] In some embodiments, when determining that the speed data meets a preset speed threshold, closing the preset air valves of the air compressor and the air unit includes:

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

[0017] In some embodiments, controlling the boost converter to enter the discharge mode according to the preset actuator position information and the preset fuel cell cell voltage data includes:

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

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

[0020] When it is determined according to the position information that the preset actuator reaches the target position or when it is determined that the minimum cell voltage is less than a preset minimum voltage threshold, the stack target current is set to zero, and the boost converter is controlled to enter the discharge mode.

[0021] In some embodiments, the dynamically monitoring the 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 cell voltage data and a preset cell voltage threshold comprises:

[0022] Dynamically monitoring the cell voltage data of each cell of the preset fuel cell to determine the highest cell voltage according to the cell voltage data;

[0023] When it is determined that the maximum cell voltage of the preset fuel cell is less than a preset maximum voltage threshold, controlling the boost converter to enter a standby mode and turning off the input side relay of the boost converter;

[0024] The actuator control instruction of the hydrogen unit is reset to zero, and each hydrogen module actuator of the hydrogen unit and each air module actuator of the air unit are disabled.

[0025] In some embodiments, when determining that the fuel cell temperature of the preset fuel cell meets a preset temperature threshold, shutting down the thermal management unit includes:

[0026] Dynamically monitoring the water temperature data of the preset fuel cell entering the stack;

[0027] When it is determined that the water temperature data entering the stack meets the preset temperature threshold, each thermal management module actuator of the thermal management unit is turned off, and the output side relay of the boost converter is disconnected.

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

[0029] When it is determined that a 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 is opened;

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

[0031] When it is determined that the anode and cathode pressures are less than the preset pressure threshold, each of the inlet and outlet stack valves is closed, and the inlet and outlet stack valves are disabled;

[0032] Dynamically detecting the 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] When it is determined that the inlet and outlet stack water temperature is less than the preset inlet and outlet stack temperature threshold, each thermal management module actuator of the thermal management unit is turned off, and the high-voltage side relay of the boost converter is disconnected.

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

[0035] The first module is used to set the target current of the stack of the preset fuel cell to the first expected current according to the preset shutdown instruction, and control the preset actuator according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation stage; wherein the preset fuel cell includes a plurality of hydrogen fuel cells, and the plurality of hydrogen fuel cells include an air unit, a thermal management unit and a hydrogen unit;

[0036] The second module is used to set the target current of the fuel cell stack to a second expected current and dynamically detect the speed data of the air compressor when it is determined that the preset fuel cell enters the shutdown preparation stage;

[0037] A third module is used to close the preset air valves of the air compressor and the air unit when it is determined that the speed data meets the preset speed threshold;

[0038] A fourth module is used to 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;

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

[0040] The sixth module is used to shut down the thermal management unit when it is determined that the fuel cell temperature of the preset fuel cell meets the preset temperature threshold.

[0041] To achieve the above objective, another aspect of an embodiment of the present application provides an electronic device, the electronic device comprising:

[0042] at least one processor;

[0043] at least one memory for storing 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 objective, another aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

[0046] The embodiments of the present application include at least the following beneficial effects: The present application provides a method, system, electronic device and storage medium for shutting down a multi-stack hydrogen fuel cell. The scheme sets the target current of the stack of the preset fuel cell to the first expected current according to the preset shutdown quality, and controls the preset actuator according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation stage. Accordingly, in the embodiment of the present invention, the preset fuel cell includes a plurality of stacks of hydrogen fuel cells, and the plurality of stacks of fuel cells include 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 embodiment of the present invention sets the target current of the stack to the second expected current, and dynamically detects the speed data of the air compressor. Correspondingly, when it is determined that the speed data meets the preset speed threshold, the embodiment of the present invention closes the preset air valves of the air compressor and the air unit. Then, according to the position information of the preset actuator and the cell voltage data of the preset fuel cell, the embodiment of the present invention controls the boost converter to enter the discharge mode. Then, the embodiment of the present invention dynamically detects the cell voltage data to control the boost converter to enter the standby mode according to the cell voltage data and the preset cell voltage threshold, and shuts down the hydrogen unit. Finally, when it is determined that the fuel cell temperature of the preset fuel cell meets the preset temperature threshold, the preset thermal management unit is turned off to complete the shutdown of the multiple hydrogen fuel cells. It is easy to understand that the shutdown method of multiple hydrogen fuel cells provided in the embodiment of the present invention has clear logic and simple operation. By dynamically monitoring the speed data, position information, single cell voltage data and fuel cell temperature, etc., the coordinated control between the preset controllers is realized, and the shutdown efficiency is effectively improved. At the same time, the embodiment of the present invention turns off the air unit, the hydrogen unit and the thermal management unit in turn, wherein the shutdown process of the air unit is divided into two steps for corresponding discharge mode processing, which improves the discharge speed and alleviates the damage problems of the battery such as reverse polarity and high potential. It can effectively improve the shutdown efficiency and stability of multiple hydrogen fuel cells and effectively alleviate the problems of system performance degradation and life attenuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic flow chart of a method for shutting down a multi-stack hydrogen fuel cell provided by an embodiment of the present invention;

[0048] Figure 2 is a schematic structural diagram of a multi-stack hydrogen fuel cell system provided by an embodiment of the present invention;

[0049] Figure 3 It is a schematic flow chart of an emergency stop method for multiple hydrogen fuel cells provided by an embodiment of the present invention;

[0050] Figure 4 It is a schematic diagram of the overall process of the shutdown method of multiple hydrogen fuel cells provided by an embodiment of the present invention;

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

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

[0053] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. 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 drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments 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 attached claims.

[0054] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of the embodiment of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination".

[0055] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, 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 those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

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

[0058] Hydrogen fuel cell: a device that uses the reaction of hydrogen and oxygen to generate electricity. Its principle is the reverse reaction of water electrolysis. Accordingly, when the hydrogen fuel cell is working, hydrogen and oxygen are supplied to the anode and cathode of the hydrogen fuel cell respectively. Hydrogen diffuses outward through the anode and releases electrons after reacting with the dielectric. The electrons reach the cathode through the external load and combine with the oxygen in the cathode to generate water and release electricity.

[0059] Multi-stack hydrogen fuel cell: refers to a system consisting of multiple hydrogen fuel cell stacks, which is used to improve the overall power output and efficiency. Each fuel cell stack works independently, and multiple fuel cell stacks work together to achieve greater power output.

[0060] A hydrogen fuel cell is a power generation device based on electrochemical theory that can directly convert the chemical energy in hydrogen and oxygen into electrical energy and output it to energy storage devices or electrical appliances, becoming a new type of power source after internal combustion engines and lithium batteries. As hydrogen fuel cells have received widespread attention in the fields of heavy trucks, distributed power generation, rail transit, etc., the power demand of single hydrogen fuel cell systems has gradually increased. In order to meet the demand for high-power energy supply and avoid technical problems such as poor durability and high system cost, it is necessary to connect multiple single hydrogen fuel cells in parallel to form a multi-stack working model and improve the service life and work efficiency of the system. In the related art, during the shutdown process of multiple hydrogen fuel cells, it is easy to cause the performance of the hydrogen fuel cell system to decrease and the life to decay. For example, due to the existence of various working conditions such as start-stop and variable load, more stringent requirements are put forward for the durability and reliability of the hydrogen fuel cell system. In particular, when shutting down, a hydrogen-air interface is easily generated in the anode, and the residual hydrogen is easy to react chemically with the air on the cathode side again to form an open circuit voltage, corrode the catalyst carrier, and cause the performance of the hydrogen fuel cell system to decrease and the life to decay. In addition, due to the complex structure of multi-stack hydrogen fuel cells, there is a certain coupling between the actuators during the shutdown process, making it difficult to achieve stable and reliable shutdown control, and the shutdown efficiency is low.

[0061] In view of this, a method, system, electronic device and storage medium for shutting down a multi-stack hydrogen fuel cell are provided in an embodiment of the present application. The scheme sets the target current of the stack of the preset fuel cell to the first expected current according to the preset shutdown quality, and controls the preset actuator according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation stage. Accordingly, in an embodiment of the present invention, 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, when it is determined that the preset fuel cell enters the shutdown preparation stage, the embodiment of the present invention sets the target current of the stack to the second expected current, and dynamically detects the speed data of the air compressor. Correspondingly, when it is determined that the speed data meets the preset speed threshold, the embodiment of the present invention closes the preset air valve of the air compressor and the air unit. Then, according to the position information of the preset actuator and the cell voltage data of the preset fuel cell, the embodiment of the present invention controls the boost converter to enter the discharge mode. Then, the embodiment of the present invention dynamically detects the cell voltage data to control the boost converter to enter the standby mode according to the cell voltage data and the preset cell voltage threshold, and shuts down the hydrogen unit. Finally, when it is determined that the fuel cell temperature of the preset fuel cell meets the preset temperature threshold, the preset thermal management unit is turned off to complete the shutdown of the multiple hydrogen fuel cells. This can effectively improve the shutdown efficiency and stability of the multiple hydrogen fuel cells and effectively alleviate the problems of system performance degradation and life attenuation.

[0062] The shutdown method of multiple hydrogen fuel cells provided in the embodiment of the present application relates to the field of hydrogen fuel cell technology. The shutdown method of multiple hydrogen fuel cells provided in the embodiment of the present application can be applied to a terminal, can also 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 laptop computer, a desktop computer, a smart speaker, a smart watch, and a car terminal, etc., but is not limited to this; the server side can be configured as an independent physical server, or it can be configured as a server cluster or distributed system composed of multiple physical servers, and can also be configured to provide cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms and other basic cloud computing services. The cloud server, the server can also be a node server in the blockchain network; the software can be an application that implements the shutdown method of multiple hydrogen fuel cells, etc., but is not limited to the above forms.

[0063] The present application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc. The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in distributed computing environments, in which tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0064] Figure 1 is an optional flow chart of a method for shutting down a multi-stack hydrogen fuel cell provided in an embodiment of the present application. Figure 1 The method may include but is not limited to steps S110 to S160.

[0065] Step S110: according to the preset shutdown instruction, the target current of the preset fuel cell stack is set to the first expected current, and the preset actuator is controlled according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation stage. The preset fuel cell includes multiple stacks of hydrogen fuel cells, and the multiple stacks of hydrogen fuel cells include 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 stage, the target current of the fuel cell stack is set to the second expected current, and the speed data of the air compressor is dynamically detected.

[0067] Step S130: When it is determined that the speed data meets the preset speed threshold, the preset air valves of the air compressor and the air unit are closed.

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

[0069] Step S150: Dynamically monitor the cell voltage data to control the boost converter to enter the standby mode and turn off the hydrogen unit and the air unit according to the cell voltage data and the preset cell voltage threshold.

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

[0071] During the operation of this specific embodiment, the embodiment of the present invention first sets the target current of the preset fuel cell stack to the first expected current according to the preset shutdown instruction, and controls the preset actuator according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation stage. Specifically, the preset fuel cell in the embodiment of the present invention includes a plurality of hydrogen fuel cell stacks, that is, a battery system composed of a plurality of hydrogen fuel cell stacks. Accordingly, the plurality of hydrogen fuel cell stacks in the embodiment of the present invention include an air unit (air system), a thermal management unit (thermal management system), a hydrogen unit (hydrogen system), a stack, and a control system. Exemplarily, referring to Figure 2In the embodiment of the present invention, the multi-stack hydrogen fuel cell system includes a multi-stack system 240, a hydrogen system 220, an air system 210, a thermal management system 230 and a control system 250. Among them, the multi-stack system 240 includes 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 includes a hydrogen inlet pressure stabilizing chamber 222, an injector group 223 (composed of multiple injectors), an ejector group 224 (composed of multiple ejectors) and various valves and sensors, such as an inlet shut-off valve group 225 (composed of multiple shut-off valves), an outlet shut-off valve group 226 (composed of multiple shut-off valves) and a hydrogen 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 to which each single stack belongs. Each pipeline has an ejector and an ejector responsible for adjusting the hydrogen inlet amount and circulation rate, and the tail discharge of the hydrogen path is regulated by the hydrogen discharge valve 221. The air system 210 includes an air compressor 211, an expander 212, an intercooler 213, a humidifier 214, and various valves and sensors, such as a stack-entry shut-off valve 215 and a stack-exit shut-off valve 216. The air compressor 211 is responsible for regulating the flow and pressure of the air entering the stack, the intercooler 213 and the humidifier 214 are responsible for controlling the temperature and humidity of the air entering the stack, and the expander 212 is responsible for regulating the exhaust back pressure and recovering part of the exhaust gas energy. The thermal management system 230 includes 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 that adopts a "large cycle + small cycle" mode. The electronic thermostat 232 is responsible for distributing the large and small cycle coolant according to the current temperature. The PTC thermal management module 233 is installed on the small cycle loop, which is mainly responsible for helping the stack to heat up during low-temperature cold start and speeding up the start-up time. Among them, the radiator 231 is installed on the large cycle loop and is responsible for cooling the stack and the air entering the stack. The control system 250 includes a fuel cell system controller (FCU), a voltage monitor (CVM), a boost converter (DCF), and other actuators and sensors that assist the normal operation of the fuel cell system. The CVM and DCF monitor the pressure, temperature, voltage, current and other signals of the fuel cell operation in real time, and maintain the actuator to operate stably with target parameters, so that the fuel cell output current follows the target current in the current state at a faster speed, ensuring the stability of the system during operation or shutdown.

[0072] Accordingly, when the preset fuel cell (multiple hydrogen fuel cells) in operation receives the preset shutdown instruction, the embodiment of the present invention first sets the target current of the stack to the first expected current. For example, the embodiment of the present invention reduces the target current of the stack to the idle current of 20A. At the same time, the embodiment of the present invention controls the preset actuator to act according to the preset shutdown state calibration value, that is, the preset shutdown state calibration value, so that the preset fuel cell enters the shutdown preparation stage. Among them, the preset actuator in the embodiment of the present invention includes each actuator in the multi-stack hydrogen fuel cell. Next, the embodiment of the present invention 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 invention sets the battery target current to the second expected current and dynamically detects the speed data of the air compressor. Specifically, in the embodiment of the present invention, by analyzing whether each preset actuator reaches the corresponding preset shutdown state calibration value, and whether the stack current is maintained at the first expected current, it is determined whether the preset fuel cell enters the shutdown preparation stage. Correspondingly, when the preset fuel cell enters the shutdown preparation stage, it means that the preset fuel cell is ready to perform the subsequent shutdown action, and the embodiment of the present invention further reduces the current and reduces the stack target current to the second expected current. For example, the embodiment of the present invention further sets the target current of the battery stack to a shutdown current of 10A, reducing the current output at a slower rate. At the same time, the embodiment of the present invention detects the speed data of the air compressor in the air unit in real time to determine whether the air compressor meets the preset speed threshold. Further, when it is determined that the speed data of the air compressor meets the preset speed threshold, the embodiment of the present invention closes the preset air valves of the air compressor and the air unit. Specifically, the preset speed threshold in the embodiment of the present invention is a pre-set air compressor speed threshold. Accordingly, the embodiment of the present invention monitors whether the speed data of the air compressor is maintained at a preset speed threshold, such as 30000rpm. When it is determined that the speed of the air compressor is maintained at the preset speed threshold, the air compressor is turned off, and each preset air valve of the air unit, such as a stop valve, is closed to further reduce the gas flow in the system.

[0073] Further, the embodiment of the present invention controls the boost converter to enter the discharge mode according to the position information of the preset actuator and the single cell voltage data of the preset fuel cell. Specifically, the position information of the preset actuator in the embodiment of the present invention refers to the position data during the adjustment process of each preset actuator (such as an air compressor, a stop valve, etc.), such as the opening of the 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 invention checks the position information of each preset actuator and the single cell voltage data of the preset fuel cell to determine whether each component is ready to enter the next stage. Accordingly, when it is determined that the position information and single cell voltage data of each preset actuator meet the preset conditions, the embodiment of the present invention controls the boost converter (DCF) to enter the discharge mode to release the stored electric energy. Next, the embodiment of the present invention dynamically monitors the single cell voltage data to control the boost converter to enter the standby mode according to the single cell voltage data and the preset single cell voltage threshold, and shuts down the hydrogen unit and the air unit. Specifically, after the boost converter enters the discharge mode, the embodiment of the present invention detects the single cell voltage data of the preset fuel cell in real time to determine whether the electric energy in the boost converter is fully released, so as to alleviate the problem of current or voltage that may be generated after shutdown. Accordingly, the embodiment of the present invention determines whether the electric energy of the boost converter has been released through 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 discharge mode, and turns off the hydrogen unit and the air unit.

[0074] Finally, the embodiment of the present invention determines whether the preset fuel cell reaches the temperature condition for shutdown based on 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 invention turns off the thermal management unit to complete the shutdown of multiple hydrogen fuel cells. Specifically, the embodiment of the present invention determines whether the temperature of the preset fuel cell meets the preset temperature threshold to determine whether the temperature of the preset fuel cell after shutdown is within a safe temperature range. When it is determined that the fuel cell temperature meets the preset temperature threshold, the embodiment of the present invention turns off the thermal management unit to complete the entire shutdown process.

[0075] In some embodiments of the present invention, controlling a preset actuator according to a preset shutdown state calibration value to control a preset fuel cell to enter a shutdown preparation phase includes but is not limited to the following steps:

[0076] The preset shutdown state calibration value is set, wherein the preset shutdown state calibration value includes the first speed calibration value of the air compressor, the duty cycle calibration value of the hydrogen injector, the second speed calibration value of the water pump, and the opening calibration value of the expander.

[0077] The corresponding air compressor, hydrogen injector, water pump and expander are controlled according to the preset shutdown state calibration value to purge the liquid water inside the anode and cathode flow channels.

[0078] In this specific embodiment, the embodiment of the present invention first sets a preset shutdown state calibration value, and then controls the corresponding air compressor, hydrogen injector, water pump and expander according to the preset shutdown state calibration value to purge the liquid water inside the anode and cathode flow channels. Specifically, the preset shutdown state calibration value in the embodiment of the present invention includes the first speed calibration value of the air compressor, the duty cycle calibration value of the hydrogen injector, the second speed calibration value of the water pump and the opening calibration value of the expander. For example, in the embodiment of the present invention, the air compressor shutdown state speed calibration value (first speed calibration value) is 37500rpm, the opening calibration value of the expander shutdown state is 55%, the duty cycle calibration value of the hydrogen injector shutdown state is 20%, and the water pump shutdown state speed calibration value (second speed calibration value) is 2000rpm. Next, the embodiment of the present invention controls each component to reach the corresponding preset shutdown state calibration value, including controlling the air compressor to operate at the first speed calibration value, controlling the duty cycle of the hydrogen injector to be the preset duty cycle calibration value, controlling the speed of the water pump to be the second speed calibration value, and controlling the opening of the expander to be the opening calibration value, so as to achieve a small current and large flow state, complete the purging of liquid water adsorbed inside the anode and cathode flow channels during the shutdown stage, and can quickly and effectively purge the liquid water adsorbed inside the anode and cathode flow channels during the shutdown process, reduce the occurrence of flooding, and thus protect the performance and life of the fuel cell stack.

[0079] In some embodiments of the present invention, when it is determined that the speed data meets the preset speed threshold, closing the preset air valves of the air compressor and the air unit includes but is not limited to the following steps:

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

[0081] In this specific embodiment, the embodiment of the present invention determines whether the air compressor meets the preset speed threshold by judging whether the difference between the speed data of the air compressor and the preset minimum speed is less than the preset deviation threshold. Specifically, the preset minimum speed in the embodiment of the present invention refers to the minimum speed threshold maintained by the air compressor, such as 30000rpm. Correspondingly, the preset deviation threshold refers to the deviation range threshold between the speed of the air compressor and the preset minimum speed, such as ±200rpm. Among them, the air compressor controller will receive the target speed set by the controller, that is, the preset minimum speed, and feedback its actual speed to the controller. When the controller receives that the actual speed reaches near the target speed (for example, the maximum deviation does not exceed 200rpm), the air compressor reaches the target speed. Accordingly, the embodiment of the present invention monitors the actual speed of the air compressor. When it is determined that the actual speed of the air compressor drops to the deviation range of the preset minimum speed (±200rpm), the air compressor and each valve in the air unit are closed.

[0082] In some embodiments of the present invention, according to the preset actuator position information and the preset fuel cell cell voltage data, controlling the boost converter to enter the discharge mode includes but is not limited to the following steps:

[0083] Detect the position information of each preset actuator.

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

[0085] When it is determined based on the position information that the preset actuator has reached the target position or when it is determined that the minimum 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 discharge mode.

[0086] In this specific embodiment, the embodiment of the present invention first detects the position information of each preset actuator, and detects the cell voltage data of each single fuel cell of the preset fuel cell to determine the lowest cell voltage, and then controls the boost converter to enter the discharge mode according to the position information or the lowest cell voltage. Specifically, the embodiment of the present invention first detects the position information of each actuator in the preset fuel cell to determine whether the preset actuator has dropped to the target position. At the same time, the embodiment of the present invention detects the cell voltage data of each single fuel cell to determine the lowest cell voltage from each cell voltage data, that is, the lowest voltage value of each single fuel cell, to determine whether the lowest cell voltage value is lower than the preset lowest voltage threshold. Accordingly, when it is determined that each actuator has dropped to the corresponding target position, or the lowest cell voltage drops below the preset lowest voltage threshold, such as less than 550mV, it means that each component is ready to enter the next stage. At this time, the embodiment of the present invention sets the target current of the stack to 0, and controls the boost converter to enter the discharge mode to start releasing the stored electrical energy.

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

[0088] Dynamically monitor the cell voltage data of each cell of the preset fuel cell to determine the highest cell voltage according to the cell voltage data.

[0089] When it is determined that the preset maximum cell voltage of the fuel cell is less than the preset maximum voltage threshold, the boost converter is controlled to enter the standby mode, and the input side relay of the boost converter is turned off.

[0090] The actuator control command 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 this specific embodiment, the embodiment of the present invention first dynamically monitors the cell voltage data of each single fuel cell of the preset fuel cell to determine the highest cell voltage according to the cell voltage data, and then judges whether the highest cell voltage is less than the preset highest voltage threshold. When it is determined that the highest cell voltage is less than the preset highest voltage threshold, the embodiment of the present invention controls the boost converter to enter the standby mode and turns off the input side relay of the boost converter. Specifically, the highest cell voltage in the embodiment of the present invention refers to the maximum value of the cell voltage data of each single fuel cell. Accordingly, the embodiment of the present invention monitors each single fuel cell in the preset fuel cell in real time to obtain the highest voltage value of the single fuel cell, that is, the highest cell voltage. Then, the embodiment of the present invention judges whether the monitored highest cell voltage is reduced to the target value (that is, the preset highest voltage threshold). When it is determined that the highest cell voltage is less than the preset highest voltage threshold, such as 150mV, it means that the electric energy of the boost converter has been released more fully. At this time, the embodiment of the present invention controls the boost converter to enter the standby mode and turns off the input side relay of the boost converter to cut off the power supply of the boost converter. Next, the embodiment of the present invention sets the actuator control instruction of the hydrogen unit to 0, and disables each hydrogen module actuator of the hydrogen unit and each air module actuator of the air unit. Specifically, in the embodiment of the present invention, the hydrogen module actuator refers to each actuator in the hydrogen unit, and the air module actuator refers to each actuator in the air unit. Correspondingly, the embodiment of the present invention sets the actuator control instruction of each actuator (hydrogen module actuator) of the hydrogen unit to 0, that is, the control signals of all actuators (such as valves, pumps, etc.) in the hydrogen unit are reset to zero or placed in a closed / stopped state. Then, the embodiment of the present invention sets all actuators (such as valves, water pumps, etc.) in the hydrogen unit and the air unit that are responsible for controlling or performing specific functions to an 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 problems such as hydrogen leakage or air mixing.

[0092] In some embodiments of the present invention, when it is determined that the fuel cell temperature of the preset fuel cell meets the preset temperature threshold, shutting down the thermal management unit includes but is not limited to the following steps:

[0093] Dynamically monitor the preset fuel cell inlet water temperature data.

[0094] When it is determined that the water temperature data entering the stack meets the preset temperature threshold, the various thermal management module actuators of the thermal management unit are turned off, and the output side relay of the boost converter is disconnected.

[0095] In this specific embodiment, the embodiment of the present invention dynamically detects the water temperature data of the preset fuel cell entering the stack to determine whether the water temperature data of the stack entering the stack meets the preset temperature threshold. When it is determined that the water temperature data of the stack entering the stack meets the preset temperature threshold, the thermal management module actuators of the thermal management unit are turned off, and the output side relay of the boost converter is disconnected. Specifically, in order to avoid the high temperature drying the proton exchange membrane after the system is shut down, after the system stops power output, the cooling system will maintain operation to make the temperature reach a safe range. Among them, the preset temperature threshold is determined by the stack. The water temperature data of the stack entering the embodiment of the present invention refers to the temperature of the cooling water entering the preset fuel cell. Accordingly, the embodiment of the present invention monitors the water temperature data of the preset fuel cell entering the stack in real time to determine whether the preset fuel cell has been fully cooled. When it is determined that the water temperature data of the stack entering the stack meets the preset temperature threshold, for example, the water temperature data of the stack entering the stack is less than 65 degrees, it means that the temperature of the preset fuel cell is within the safe temperature range. At this time, the embodiment of the present invention turns off the thermal management module actuators of the thermal management unit, and the thermal management unit stops working. At the same time, the embodiment of the present invention disconnects the output side relay of the boost converter to complete the shutdown process of the multi-stack hydrogen fuel cell.

[0096] In some embodiments of the present invention, the method for shutting down a multi-stack hydrogen fuel cell provided by the embodiment of the present invention further includes but is not limited to the following steps:

[0097] When it is determined that the preset emergency stop command has been received, the hydrogen unit and the air unit are closed, and the various inlet and outlet valves of the preset fuel cell are opened.

[0098] Dynamically detect 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.

[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] Dynamically detect the inlet and outlet water temperatures of the preset fuel cell to determine whether the inlet and outlet water temperatures are less than the preset inlet and outlet temperature thresholds.

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

[0102] In this specific embodiment, when the preset fuel cell receives the preset emergency stop command, the embodiment of the present invention closes 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 abnormalities may occur, such as the speed of the air compressor does not drop to the target speed within the preset time, the various preset actuators do not drop to the target position or the cell voltage does not drop below the target cell voltage within the preset time, the output current and the cell voltage do not drop below the target value within the preset time, etc. Accordingly, when it is determined that a shutdown abnormality has occurred, the embodiment of the present invention completes the emergency shutdown by executing the corresponding emergency stop process, alleviates sudden problems that occur during the shutdown process, and causes irreversible damage to the fuel cell stack and the system, and effectively improves 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, the embodiment of the present invention first turns off all actuators of the air unit and the hydrogen unit, and at the same time opens the various inlet and outlet valves of the preset fuel cell, that is, opens all valves in and out of the preset fuel cell to release the pressure in the stack.

[0103] Next, the embodiment of the present invention dynamically detects the anode and cathode pressures of the preset fuel cell to determine whether the anode and cathode pressures are less than the preset pressure threshold. When it is determined that the anode and cathode pressures are less than the preset pressure threshold, the embodiment of the present invention closes each inlet and outlet valve, and disables the inlet and outlet valves. Specifically, the anode and cathode pressures in the embodiment of the present invention refer to the pressure values ​​of the anode and cathode in the preset fuel cell. Among them, the embodiment of the present 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 already less than the preset pressure threshold, indicating that the pressure values ​​of the cathode and anode of the fuel cell stack have dropped to a safe range, the embodiment of the present invention closes each inlet and outlet valve, and disables these inlet and outlet valves to reduce the flow of fluid in the preset fuel cell.

[0104] Furthermore, the embodiment of the present invention dynamically detects the inlet and outlet water temperature of the preset fuel cell to determine whether the inlet and outlet water temperature is less than the preset inlet and outlet temperature threshold. When it is determined that the inlet and outlet water temperature is less than the preset inlet and outlet temperature threshold, the embodiment of the present invention turns off the various thermal management module actuators of the thermal management unit and disconnects the high-voltage side relay of the boost converter. Specifically, since the preset fuel cell needs the thermal management unit to perform temperature management during operation to avoid the problem of excessive temperature. Accordingly, the embodiment of the present invention monitors the inlet and outlet cooling water temperatures of the preset fuel cell, that is, the inlet and outlet water temperatures, to determine whether the temperature of the preset fuel cell drops to a preset safety range, that is, the preset inlet and outlet temperature threshold. When it is detected that the inlet and outlet water temperature is less than the preset inlet and outlet temperature threshold, it means that the temperature of the fuel cell stack is already within the safety range. At this time, the embodiment of the present invention turns off the thermal management unit, turns off the various thermal management module actuators, and stops the thermal management activity. At the same time, the embodiment of the present invention disconnects the high-voltage side relay of the boost converter, cuts off the electrical connection between the boost converter and the high-voltage source, and thus achieves an emergency shutdown.

[0105] Next, the solution of the embodiment of the present invention is described in detail and explained in conjunction with a specific shutdown scenario of multiple hydrogen fuel cells:

[0106] For example, Figure 4 As shown, in an embodiment of the present invention, when a running multi-stack fuel cell system receives a preset shutdown command, the embodiment of the present invention first reduces the preset fuel cell stack target current to an idle current of 20A, that is, the first expected current, and controls the air compressor, expander, hydrogen injector, water pump and other components to operate at the calibrated value of the shutdown state, and the system enters the initial stage of the shutdown module, that is, the shutdown preparation stage. Next, the embodiment of the present invention sets the stack target current to a shutdown current of 10A, that is, the second expected current, while the air compressor maintains a minimum speed, such as 30,000 rpm, and the water pump follows the speed reduction to maintain the water pressure about 5 kPa lower than the air pressure, and the hydrogen injector target opening maintains a hydrogen-air pressure difference of 20 kPa. Then, the embodiment of the present invention determines whether the deviation of the actual speed of the air compressor from the pre-target speed has dropped to within the minimum speed deviation of 200 rpm. If so, the next shutdown command step is executed, otherwise the emergency stop module is entered, that is, the emergency stop step is executed, such as Figure 3As shown. When it is determined that the air compressor has dropped to the target speed, the embodiment of the present invention closes the air compressor and the valves of the air system, and determines whether each actuator has dropped to the target position or whether the lowest single cell voltage has dropped below the target value of 550mV. If so, the next shutdown instruction step is executed, otherwise the emergency stop module is entered. Correspondingly, when it is determined that each actuator has dropped to the target position or the lowest single cell voltage has dropped below the target value of 550mV, the embodiment of the present invention controls the boost converter (DCF) to enter the discharge mode and sets the target current to 0. Then, it is determined whether the highest single cell voltage has dropped below the target value of 150mV. If so, the next shutdown instruction step is executed, otherwise the emergency stop module is entered to perform the emergency shutdown step. Correspondingly, when it is determined that the highest single cell voltage has dropped below the target value of 150mV, the embodiment of the present invention closes the DCF input side relay, cuts off the DCF, so that the DCF enters the standby mode, and disables the hydrogen-air system actuator. Furthermore, the embodiment of the present invention determines whether the inlet water temperature drops below the target temperature value, such as 65 degrees Celsius. If so, the embodiment of the present invention shuts down 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 the embodiment of the present invention has two stages in the discharge process. The first stage is that the system stops the air supply. The components have different response times. Since the cathode inlet and outlet of the battery stack are not completely closed, the single-cell battery still maintains a high potential. In order to quickly reduce the single-cell voltage, the embodiment of the present invention continues to use a small current to pull the load. At this time, the system is still in the power output stage, so it is necessary to simultaneously judge the component response state and the protection condition of the minimum single-cell voltage. Correspondingly, the second stage is that the air supply has been completely cut off or there is a single-cell voltage lower than the protection boundary. The embodiment of the present invention discharges through the DCF discharge mode. This stage is performed by the discharge resistor inside the DCF. The discharge speed is slow and the risk is small. Therefore, it is only necessary to judge that the maximum single-cell voltage is lower than the set boundary. In the embodiment of the present invention, by dividing the air system shutdown process into two stages for different discharge methods, the discharge speed of the system is improved, and the battery is prevented from being damaged by reverse polarity, high potential, etc. In addition, in the embodiment of the present invention, the three major subsystems of air, hydrogen, and water are shut down in sequence, and the process is simple and clear, and no repeated actions are performed.

[0108] In addition, the embodiment of the present invention uses the DCF input current as the main control parameter, and controls the DCF input current to promote the shutdown process according to the data collected in real time by each sensor, so as to realize the coordinated control of each actuator during the shutdown process and improve the shutdown efficiency. During the whole shutdown cycle, the embodiment of the present invention first sets the DCF input current to the idle current, such as 20A, and the hydrogen-air system actuator operates according to the shutdown state command parameter. The system enters the low current and high volume state, and the hydrogen-air passage is purged for 20 seconds. Then, the embodiment of the present invention sets the DCF input current to the shutdown current, such as 10A, and the hydrogen-air actuator operates according to the idle state command parameter. After two seconds, the air compressor, the air side inlet and outlet stack valve and the expander are closed, the bypass valve is opened, and the hydrogen side actuator maintains the shutdown current operation. Next, the embodiment of the present invention sets the DCF input current to 0, and enters the discharge state, consumes the oxygen partial pressure on the air side, reduces the cell voltage, closes the bypass valve, and the hydrogen side actuator operates with the 0 current state control parameter. Furthermore, the DCF is shut down, the input relay is turned off, and the actuator of the hydrogen-air system is immediately disabled. Then, when the inlet and outlet water temperatures reach the target value, the thermal management system actuator is turned off and all actuators are disabled, the DCF high-voltage side relay is turned off, and the shutdown is completed.

[0109] Accordingly, during the entire shutdown cycle of the multi-stack fuel cell system, when the system control module determines that a failure occurs during the shutdown process, the system will enter the emergency stop module, that is, perform an emergency shutdown. After the system enters the emergency stop module, all valves in and out of the hydrogen system and the air system are opened, and all actuators are closed. After the inlet and outlet water temperatures drop to a safe range, all valves and actuators are closed, and the DCF disconnects the high-voltage side relay to complete the emergency shutdown.

[0110] It is easy to understand that the multi-stack hydrogen fuel cell shutdown method provided by the embodiment of the present invention has clear logic and simple operation. It promotes the shutdown process by controlling the DCF input current, and monitors the pressure, temperature, voltage and other signals during the shutdown process of the fuel cell stack according to the real-time data of each sensor, so as to realize the coordinated control of each actuator during the shutdown process and improve the shutdown efficiency. At the same time, the embodiment of the present invention is provided with a fault emergency stop module to avoid sudden problems during the shutdown process, which may cause irreversible damage to the fuel cell stack and the system, and effectively improve the stability and safety of the system shutdown. Among them, the embodiment of the present invention can be used for a multi-stack system composed of multiple single battery cells, which has universality and versatility, simple structure, clear logic, and is easy to implement, and can meet multiple application scenarios such as test development and engineering practice.

[0111] See also Figure 5 The embodiment of the present application also provides a multi-stack hydrogen fuel cell shutdown system, which can implement the multi-stack hydrogen fuel cell shutdown method, and the system includes:

[0112] The first module 310 is used to set the target current of the preset fuel cell stack to a first expected current according to the preset shutdown instruction, and control the preset actuator according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation stage. The preset fuel cell includes a plurality of hydrogen fuel cells, and the plurality of hydrogen fuel cells include an air unit, a thermal management unit, and a hydrogen unit.

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

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

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

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

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

[0118] It can be understood that the contents of the above method embodiments are all applicable to the present system embodiments, the functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0119] The embodiment of the present application also provides an electronic device, the electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the above-mentioned multi-stack hydrogen fuel cell shutdown method when executing the computer program. The electronic device can be any intelligent terminal including a tablet computer, a car computer, etc.

[0120] It can be understood that the contents of the above method embodiments are all applicable to the present device embodiments, the functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0121] See also Figure 6 , Figure 6 The hardware structure of an electronic device of another embodiment is illustrated, and the electronic device includes:

[0122] The processor 410 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0123] The memory 420 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 420 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 420, and the processor 410 calls and executes the shutdown method of multiple hydrogen fuel cells in the embodiment of this application;

[0124] Input / output interface 430, used to implement information input and output;

[0125] Communication interface 440, used to realize communication interaction between the device and other devices, which can be realized through wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WIFI, Bluetooth, etc.);

[0126] bus 450 , which transmits information between the various components of the device (e.g., processor 410 , memory 420 , input / output interface 430 , and communication interface 440 );

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

[0128] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above-mentioned multi-stack hydrogen fuel cell shutdown method is implemented.

[0129] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiments, the functions specifically implemented by the present storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0130] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned 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 intended 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 in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

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

[0133] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0134] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0135] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are 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 (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0137] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0138] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including multiple instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store programs.

[0139] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A method for shutting down a multi-stack hydrogen fuel cell, characterized in that: The method comprises the following steps: According to a preset shutdown instruction, the target current of the stack of the preset fuel cell is set to a first expected current, and a preset actuator is controlled according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation stage; wherein the preset fuel cell includes a plurality of stacks of hydrogen fuel cells, and the plurality of stacks of hydrogen fuel cells include an air unit, a thermal management unit, and a hydrogen unit; When it is determined that the preset fuel cell enters the shutdown preparation stage, the stack target current is set to a second expected current, and the speed data of the air compressor is dynamically detected; When it is determined that the speed data meets a preset speed threshold, closing the preset air valves of the air compressor and the air unit; Controlling 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; Dynamically monitor the 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 cell voltage data and a preset cell voltage threshold; When it is determined that the fuel cell temperature of the preset fuel cell meets a preset temperature threshold, the thermal management unit is turned off.

2. The method according to claim 1, characterized in that The step of controlling a preset actuator according to a preset shutdown state calibration value to control the preset fuel cell to enter a shutdown preparation stage includes: Setting the preset shutdown state calibration value; wherein the preset shutdown state calibration value includes the first speed calibration value of the air compressor, the duty cycle calibration value of the hydrogen injector, the second speed calibration value of the water pump and the opening calibration value of the expander; The air compressor, the hydrogen injector, the water pump and the expander are controlled accordingly according to the preset shutdown state calibration value to purge the liquid water inside the anode and cathode flow channels.

3. The method according to claim 1, characterized in that When it is determined that the speed data meets the preset speed threshold, closing the preset air valves of the air compressor and the air unit includes: When it is determined that the difference between the rotation speed data and the preset minimum rotation speed is less than a preset deviation threshold, the air compressor and each of the preset air valves are closed.

4. The method according to claim 1, characterized in that The step of controlling the boost converter to enter a discharge mode according to the preset actuator position information and the preset fuel cell cell voltage data comprises: Detecting position information of each of the preset actuators; Detecting the cell voltage data of each cell fuel cell of the preset fuel cell to determine a minimum cell voltage according to the cell voltage data; When it is determined according to the position information that the preset actuator reaches the target position or when it is determined that the minimum cell voltage is less than a preset minimum voltage threshold, the stack target current is set to zero, and the boost converter is controlled to enter the discharge mode.

5. The method according to claim 1, characterized in that The dynamically monitoring the 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 cell voltage data and a preset cell voltage threshold value, comprises: Dynamically monitoring the cell voltage data of each cell of the preset fuel cell to determine the highest cell voltage according to the cell voltage data; When it is determined that the maximum cell voltage of the preset fuel cell is less than a preset maximum voltage threshold, controlling the boost converter to enter a standby mode and turning off the input side relay of the boost converter; The actuator control instruction of the hydrogen unit is reset to zero, and each hydrogen module actuator of the hydrogen unit and each air module actuator of the air unit are disabled.

6. The method according to claim 1, characterized in that When it is determined that the fuel cell temperature of the preset fuel cell meets the preset temperature threshold, shutting down the thermal management unit comprises: Dynamically monitoring the water temperature data of the preset fuel cell entering the stack; When it is determined that the water temperature data entering the stack meets the preset temperature threshold, each thermal management module actuator of the thermal management unit is turned off, and the output side relay of the boost converter is disconnected.

7. The method according to claim 1, characterized in that The method further comprises: When it is determined that a 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 is opened; Dynamically detecting the anode and cathode pressures of the 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, each of the inlet and outlet stack valves is closed, and the inlet and outlet stack valves are disabled; Dynamically detecting the 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; When it is determined that the inlet and outlet stack water temperature is less than the preset inlet and outlet stack temperature threshold, each thermal management module actuator of the thermal management unit is turned off, and the high-voltage side relay of the boost converter is disconnected.

8. A multi-stack hydrogen fuel cell shutdown system, characterized in that: The system comprises: The first module is used to set the target current of the stack of the preset fuel cell to the first expected current according to the preset shutdown instruction, and control the preset actuator according to the preset shutdown state calibration value to control the preset fuel cell to enter the shutdown preparation stage; wherein the preset fuel cell includes a plurality of hydrogen fuel cells, and the plurality of hydrogen fuel cells include an air unit, a thermal management unit and a hydrogen unit; The second module is used to set the target current of the fuel cell stack to a second expected current and dynamically detect the speed data of the air compressor when it is determined that the preset fuel cell enters the shutdown preparation stage; A third module is used to close the preset air valves of the air compressor and the air unit when it is determined that the speed data meets the preset speed threshold; A fourth module is used to 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; A fifth module is used to dynamically monitor the cell voltage data, so as to control the boost converter to enter a standby mode and turn off the hydrogen unit and the air unit according to the cell voltage data and a preset cell voltage threshold; The sixth module is used to shut down the thermal management unit when it is determined that the fuel cell temperature of the preset fuel cell meets the preset temperature threshold.

9. An electronic device, characterized in that: include: at least one processor; at least one memory for storing 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 according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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