Shutdown method, device and system of fuel cell system and vehicle
The water content is judged by the stack impedance of the fuel cell system, and if the preset conditions are not met, the cathode will be purged, which solves the problem of inaccurate water content control caused by timing purge and improves the success rate of start-up.
Patent Information
- Application Number
- CN202311168635.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-11
- Publication Date
- 2025-03-11
AI Technical Summary
In the prior art, the water content of the fuel cell system is controlled by timed purge, resulting in inaccurate water content control, which affects the success rate of the next startup.
The stack impedance of the fuel cell system determines whether the water content meets the preset conditions. If it is not met, the cathode will be purged until the conditions are met, and the control system will be shut down.
Accurate and effective control of the water content state of the fuel cell is achieved, and the success rate of the next startup is improved.
Smart Images
Figure CN119601717A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of fuel cells, and more particularly, to a method, device, system, and vehicle for shutting down a fuel cell system in the field of fuel cells. Background Art
[0002] The success of the hydrogen fuel cell system startup is largely affected by the initial water content inside the hydrogen fuel cell. Too low a water content will cause the proton exchange membrane to be too dry, affecting the hydrogen proton conduction; too high a water content will cause the proton exchange membrane to be too wet, and excessive water will penetrate into the gas diffusion layer, hindering the transmission of the reaction gas. The water content inside the hydrogen fuel cell at startup is mainly affected by the water content at the end of the last shutdown.
[0003] In the related art, a strategy of regularly purging the cathode of a hydrogen fuel cell is generally adopted to ensure that the water content of the hydrogen fuel cell meets the startup requirements of the fuel cell system and ensure the startup success rate of the fuel cell system.
[0004] However, the time for the timed purge of the hydrogen fuel cell cathode is obtained by calibrating the hydrogen fuel cell system in the laboratory. If the environmental parameters (such as intake temperature, humidity, and atmospheric pressure) change, there will be a deviation between the calibrated value and the actual purge time, resulting in inaccurate control of the shutdown water content, affecting the next startup, which urgently needs to be improved. Summary of the Invention
[0005] The present application provides a method, device, system and vehicle for shutting down a fuel cell system. The method determines whether the water content of the fuel cell meets certain requirements through the stack impedance of the fuel cell system, solving the problem in related technologies of controlling the water content through timed purging, resulting in inaccurate water content control and affecting the next startup. This method thereby achieves more precise and effective control of the water content status of the fuel cell, which is more conducive to the next startup of the fuel cell system.
[0006] In a first aspect, a method for shutting down a fuel cell system is provided, the method comprising:
[0007] receiving a shutdown instruction of the fuel cell system, and obtaining a stack impedance of the fuel cell system based on the shutdown instruction;
[0008] Based on the stack impedance, determining whether the fuel cell system meets a preset shutdown condition;
[0009] If the fuel cell system does not meet the preset shutdown condition, the cathode of the fuel cell in the fuel cell system is purged until the fuel cell system meets the preset shutdown condition, and the fuel cell system is controlled to shut down.
[0010] Through the above technical solution, whether the water content of the fuel cell meets certain requirements is judged based on the stack impedance of the fuel cell system, which solves the problem in the related technology of controlling the water content by timed purge, resulting in inaccurate water content control and affecting the next startup, thereby achieving more accurate and effective control of the water content status of the fuel cell, which is more conducive to the next startup of the fuel cell system.
[0011] In conjunction with the first aspect, in some possible implementations, determining whether the fuel cell system meets a preset shutdown condition based on the stack impedance includes:
[0012] Determining whether the stack impedance is less than a preset threshold, wherein the preset threshold is a lower limit of an optimal impedance range;
[0013] If the stack impedance is less than the preset threshold, it is determined that the fuel cell system does not meet the preset shutdown condition; otherwise, it is determined that the fuel cell system meets the preset shutdown condition.
[0014] Through the above technical solution, preset thresholds and preset shutdown conditions are set, and the stack impedance of the fuel cell system is compared with the preset threshold, so that different measures can be taken on the fuel cell cathode according to the comparison results, thereby achieving more accurate and effective control of the water content state of the fuel cell.
[0015] In combination with the first aspect and the above implementations, in some possible implementations, when controlling the fuel cell system to shut down, the method further includes:
[0016] Continuously monitoring whether the stack impedance is less than a preset threshold;
[0017] If the stack impedance is less than the preset threshold, the cathode of the fuel cell in the fuel cell system is re-purged; otherwise, when the fuel cell system completes shutdown, the current monitoring action is terminated.
[0018] Through the above technical solution, the stack impedance of the fuel cell system is continuously monitored during the shutdown process, effectively preventing the water content of the fuel cell from increasing during the shutdown process, thereby improving the startup success rate of the fuel cell system.
[0019] In combination with the first aspect and the above implementations, in some possible implementations, the optimal impedance interval is determined by an optimal fuel cell water content range when the fuel cell system is started.
[0020] Through the above technical solution, the optimal impedance range is determined according to the optimal fuel cell water content range when the fuel cell system is started, which can effectively improve the startup success rate of the fuel cell system.
[0021] In combination with the first aspect and the above implementations, in some possible implementations, after purging the cathode of the fuel cell in the fuel cell system, the method further includes:
[0022] Obtaining a purge duration for purging a cathode of a fuel cell in the fuel cell system;
[0023] If the purge time is longer than the preset time, an acoustic reminder and / or a visual reminder is given.
[0024] Through the above-mentioned technical solution, the purge time of the cathode of the fuel cell in the fuel cell system is compared with the preset time. If the purge time is longer than the preset time, the purge equipment may have failed, and an acoustic reminder and / or optical reminder is given to remind the user to inspect and repair the equipment.
[0025] According to the fuel cell system shutdown method of the embodiment of the present application, upon receiving a fuel cell system shutdown command and determining that the fuel cell system does not meet a preset shutdown condition based on the fuel cell system's stack impedance, the fuel cell cathode within the fuel cell system can be purged until the fuel cell system meets the preset shutdown condition, thereby controlling the fuel cell system to shut down. Thus, by determining whether the fuel cell water content meets certain requirements based on the fuel cell system's stack impedance, this solves the problem in related technologies of controlling water content through timed purging, which leads to inaccurate water content control and affects the next startup. This allows for more accurate and effective control of the fuel cell water content state, further facilitating the next startup of the fuel cell system.
[0026] In a second aspect, a shutdown device for a fuel cell system is provided, the device comprising:
[0027] an acquisition module, configured to receive a shutdown instruction of the fuel cell system and acquire the stack impedance of the fuel cell system based on the shutdown instruction;
[0028] a judgment module, configured to judge whether the fuel cell system meets a preset shutdown condition based on the stack impedance;
[0029] The control module is used to purge the cathode of the fuel cell in the fuel cell system if the fuel cell system does not meet the preset shutdown condition, until the fuel cell system meets the preset shutdown condition, and control the fuel cell system to shut down.
[0030] With reference to the second aspect, in some possible implementations, the judgment module is configured to:
[0031] Determining whether the stack impedance is less than a preset threshold, wherein the preset threshold is a lower limit of an optimal impedance range;
[0032] If the stack impedance is less than the preset threshold, it is determined that the fuel cell system does not meet the preset shutdown condition; otherwise, it is determined that the fuel cell system meets the preset shutdown condition.
[0033] In combination with the second aspect and the above implementations, in some possible implementations, when controlling the fuel cell system to shut down, the control module is further configured to:
[0034] Continuously monitoring whether the stack impedance is less than a preset threshold;
[0035] If the stack impedance is less than the preset threshold, the cathode of the fuel cell in the fuel cell system is re-purged; otherwise, when the fuel cell system completes shutdown, the current monitoring action is terminated.
[0036] In combination with the second aspect and the above implementations, in some possible implementations, the optimal impedance interval is determined by an optimal fuel cell water content range when the fuel cell system is started.
[0037] In combination with the second aspect and the above implementations, in some possible implementations, after purging the cathode of the fuel cell in the fuel cell system, the method further includes:
[0038] Obtaining a purge duration for purging a cathode of a fuel cell in the fuel cell system;
[0039] If the purge time is longer than the preset time, an acoustic reminder and / or a visual reminder is given.
[0040] According to an embodiment of the present application, a shutdown device for a fuel cell system is configured to, upon receiving a shutdown command from the fuel cell system and determining, based on the fuel cell stack impedance, that the fuel cell system does not meet a preset shutdown condition, purge the cathodes of the fuel cells within the fuel cell system until the fuel cell system meets the preset shutdown condition, thereby controlling the fuel cell system to shut down. Thus, by determining whether the water content of the fuel cell meets certain requirements based on the fuel cell stack impedance, this solves the problem in related technologies of controlling water content through timed purges, which can lead to inaccurate water content control and affect the next startup. This allows for more accurate and effective control of the water content status of the fuel cell, further facilitating the next startup of the fuel cell system.
[0041] In a third aspect, a fuel cell system is provided, comprising the fuel cell system shutdown device described in the above embodiment.
[0042] According to the fuel cell system of the embodiment of the present application, the shutdown device of the above-mentioned fuel cell system solves the problem in the related art of controlling the water content by timed purging, which leads to inaccurate water content control and affects the next startup, thereby achieving more accurate and effective control of the water content status of the fuel cell, which is more conducive to the next startup of the fuel cell system.
[0043] In a fourth aspect, a vehicle is provided, comprising the fuel cell system described in the above embodiment.
[0044] According to the vehicle of the embodiment of the present application, the above-mentioned fuel cell system solves the problem in the related art of controlling the water content by timed purging, which leads to inaccurate water content control and affects the next startup, thereby achieving more accurate and effective control of the water content status of the fuel cell, which is more conducive to the next startup of the fuel cell system. BRIEF DESCRIPTION OF THE DRAWINGS
[0045] Figure 1 This is a flowchart of a method for shutting down a fuel cell system according to an embodiment of the present application;
[0046] Figure 2 A flowchart of water content control during shutdown of a fuel cell system according to one embodiment of the present application;
[0047] Figure 3 Schematic diagram of a shutdown device for a fuel cell system according to an embodiment of the present application. DETAILED DESCRIPTION
[0048] The following will clearly and thoroughly describe the technical solutions in this application in conjunction with the accompanying drawings. In the description of the embodiments of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more than two.
[0049] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.
[0050] Those skilled in the art may understand that the traditional strategy is to perform a timed purge on the cathode of a hydrogen fuel cell. However, the time for the timed purge is calibrated by the hydrogen fuel cell system in the laboratory and is only applicable to the local environment, including the intake air temperature, humidity, and atmospheric pressure. When the location or environment changes, there will be a deviation between the calibrated value and the actual purge time, resulting in inaccurate control of the water content at shutdown, which will affect the next startup.
[0051] Therefore, this application proposes a fuel cell system shutdown method. This method can, upon receiving a shutdown command from the fuel cell system and determining that the fuel cell system does not meet a preset shutdown condition based on the fuel cell system's stack impedance, purge the fuel cell cathode within the fuel cell system until the fuel cell system meets the preset shutdown condition, thereby controlling the fuel cell system to shut down. Thus, by determining whether the fuel cell water content meets certain requirements based on the fuel cell system's stack impedance, this method solves the problem in related technologies of controlling water content through timed purges, which leads to inaccurate water content control and affects the next startup. This method thus achieves more accurate and effective control of the fuel cell water content state, which is more conducive to the next startup of the fuel cell system.
[0052] Specifically, Figure 1 A flowchart of a method for shutting down a fuel cell system provided in an embodiment of the present application.
[0053] For example, Figure 1 As shown, the fuel cell system shutdown method includes the following steps:
[0054] In step S101 , a shutdown instruction of the fuel cell system is received, and the stack impedance of the fuel cell system is acquired based on the shutdown instruction.
[0055] It should be understood that when the fuel cell system is turned on, hydrogen is supplied to the anode of the fuel cell and air is supplied to the cathode. These two reaction gases diffuse from the gas diffusion layer of the fuel cell to the catalyst layer, and then an electrochemical reaction occurs in the catalyst layer. The hydrogen is oxidized into hydrogen protons and combined with water molecules in the proton exchange membrane to be transferred to the cathode to combine with oxygen to form water. The success rate of starting up the fuel cell system is mainly affected by the water content of the fuel cell at the end of the last shutdown. The water content of the fuel cell cannot be directly detected. Therefore, the embodiment of the present application can indirectly determine the water content of the fuel cell by detecting the stack impedance of the fuel cell system based on the relationship between the stack impedance of the fuel cell system and the water content of the fuel cell.
[0056] It should be noted that the embodiment of the present application can receive a shutdown command for shutting down the fuel cell system through the FCU (Fuel-cell Control Unit) of the fuel cell system. The shutdown command can be issued by the vehicle controller or by other related devices or equipment such as pressure sensors, concentration sensors, monitoring and control equipment. No specific limitation is made here. When obtaining the stack impedance of the fuel cell system, the embodiment of the present application can directly adopt the acquisition method in the relevant technology. To avoid redundancy, it will not be described in detail here.
[0057] In step S102 , based on the stack impedance, it is determined whether the fuel cell system meets a preset shutdown condition.
[0058] In some embodiments, based on the stack impedance, it is determined whether the fuel cell system meets the preset shutdown conditions, including determining whether the stack impedance is less than a preset threshold, wherein the preset threshold is the lower limit value of the optimal impedance range; if the stack impedance is less than the preset threshold, it is determined that the fuel cell system does not meet the preset shutdown conditions, otherwise, it is determined that the fuel cell system meets the preset shutdown conditions.
[0059] In some embodiments, the stack impedance is inversely proportional to the water content of the fuel cell.
[0060] Among them, the preset threshold value can be a threshold value set in advance by a technician, a threshold value obtained through a limited number of experiments, or an impedance range obtained through a limited number of computer simulations; preferably, in some embodiments, the optimal impedance range is determined by the optimal fuel cell water content range when the fuel cell system is started.
[0061] Specifically, after obtaining the stack impedance of the fuel cell system, the embodiment of the present application can compare the stack impedance of the fuel cell system with a preset threshold value. If the stack impedance of the fuel cell system is less than the preset threshold value, since the stack impedance of the fuel cell is inversely proportional to the water content of the fuel cell, it means that the water content of the fuel cell is relatively high at this time, and a high water content will cause the startup success rate of the fuel cell system to decrease. Therefore, in order to ensure the startup success rate of the fuel cell system, it can be determined that the fuel cell system does not meet the preset shutdown conditions at this time. If the stack impedance of the fuel cell system is greater than or equal to the preset threshold value, it means that the water content of the fuel cell at this time will not cause the startup success rate of the fuel cell system to be too low, that is, it is determined that the fuel cell system meets the preset shutdown conditions.
[0062] Therefore, by comparing the stack impedance of the fuel cell system with the preset threshold, it is determined whether the fuel cell system meets the preset shutdown conditions, which greatly improves the accuracy of the judgment result and facilitates the subsequent adoption of the best measures to adjust the water content of the fuel cell based on the comparison results, thereby improving the startup success rate of the fuel cell system.
[0063] In step S103 , if the fuel cell system does not meet the preset shutdown condition, the cathodes of the fuel cells in the fuel cell system are purged until the fuel cell system meets the preset shutdown condition, and the fuel cell system is controlled to shut down.
[0064] It can be understood that if the fuel cell system does not meet the preset shutdown conditions, it means that the water content of the fuel cell is too high, which is not conducive to the next startup of the fuel cell system. The embodiment of the present application can purge the fuel cell cathode in the fuel cell system until the stack impedance of the fuel cell system is in the preset impedance range, and control the fuel cell system to shut down.
[0065] Therefore, by continuously purging the fuel cell cathode in the fuel cell system when it is determined that the fuel cell system does not meet the preset shutdown conditions, until the fuel cell system meets the preset shutdown conditions, the fuel cell system is controlled to shut down, which greatly improves the success rate of starting the fuel cell system next time.
[0066] In addition, in order to prevent the situation where the fuel cell still has a small power output when the fuel cell system is shut down, causing the water content of the fuel cell to increase and the stack impedance of the fuel cell system to gradually decrease and exceed the optimal range, the embodiment of the present application can also continuously monitor the stack impedance of the fuel cell system during the process of controlling the shutdown of the fuel cell system.
[0067] As a possible implementation method, in some embodiments, when controlling the shutdown of the fuel cell system, it also includes: continuously monitoring whether the stack impedance is less than a preset threshold; if the stack impedance is less than the preset threshold, re-purging the fuel cell cathode in the fuel cell system; otherwise, when the fuel cell system completes the shutdown, ending the current monitoring action.
[0068] Specifically, if the stack impedance monitoring value of the fuel cell system is less than a preset threshold, the fuel cell cathode of the fuel cell system is re-purged and the impedance is continuously monitored until the impedance monitoring value is in the preset impedance range, and the fuel cell system is shut down and monitoring ends.
[0069] Therefore, by continuously monitoring the comparison result between the stack impedance of the fuel cell system and the preset threshold value when the fuel cell system is shut down, and taking different response measures according to the comparison result, it is possible to avoid the situation where the fuel cell still has a small power output, resulting in an increase in the water content of the fuel cell and the stack impedance of the fuel cell system gradually decreasing and exceeding the optimal range.
[0070] As a possible implementation method, in some embodiments, after purging the cathode of the fuel cell in the fuel cell system, it also includes: obtaining the purging time of the cathode of the fuel cell in the fuel cell system; if the purging time is greater than the preset time, an acoustic reminder and / or an optical reminder is performed.
[0071] The preset duration may be a duration pre-set by the user, a duration obtained through a finite number of experiments, or a duration obtained through a finite number of computer simulations, and is not specifically limited here.
[0072] Specifically, in the embodiment of the present application, a timer can be used to obtain the purge duration of the cathode of the fuel cell in the fuel cell system. It should be noted that the above method of obtaining the purge duration of the cathode of the fuel cell in the fuel cell system by using a timer is only exemplary and does not limit the present application. Those skilled in the art may adopt other methods to obtain the purge duration of the cathode of the fuel cell in the fuel cell system according to actual circumstances. To avoid redundancy, it will not be described in detail here.
[0073] Furthermore, when the purge time is longer than the preset time, it is possible that the purge equipment has malfunctioned. The user can be reminded by an acoustic alarm through a buzzer, an optical alarm through a light-emitting diode, or a combination of an acoustic alarm through a buzzer and an optical alarm through a light-emitting diode, so that the user can inspect and repair the purge equipment.
[0074] In order to enable those skilled in the art to further understand the shutdown method of the fuel cell system according to the embodiment of the present application, it is described in detail below with reference to specific embodiments.
[0075] like Figure 2 As shown, a hydrogen fuel cell may be used in the fuel cell system, and the shutdown method of the fuel cell system includes the following steps:
[0076] S201, shutdown begins.
[0077] S202, monitoring the impedance of the hydrogen fuel cell stack.
[0078] S203, determine whether the impedance value of the hydrogen fuel cell stack is less than a preset threshold value, if so, execute S204, otherwise, execute S205.
[0079] S204, purging the cathode of the hydrogen fuel cell and continuously monitoring the impedance of the hydrogen fuel cell stack, and returning to execute S203.
[0080] S205, controlling the fuel cell system to shut down, and continuously monitoring the impedance of the hydrogen fuel cell stack during the shutdown process until the shutdown is completed.
[0081] S206: If the impedance of the hydrogen fuel cell stack is less than a preset threshold value during the shutdown of the fuel cell system, execute S204; otherwise, execute S207.
[0082] S207, shutdown is completed and monitoring ends.
[0083] According to the fuel cell system shutdown method of the embodiment of the present application, upon receiving a fuel cell system shutdown command and determining, based on the fuel cell system's stack impedance, that the fuel cell system does not meet a preset shutdown condition, the fuel cell cathode within the fuel cell system is purged until the fuel cell system meets the preset shutdown condition, thereby controlling the fuel cell system to shut down. Thus, by determining whether the fuel cell water content meets certain requirements based on the fuel cell system's stack impedance, this method solves the problem in related technologies of controlling water content through timed purges, which can lead to inaccurate water content control and affect the next startup. This method achieves more accurate and effective control of the fuel cell water content state, further facilitating the next startup of the fuel cell system.
[0084] Next, a shutdown device for a fuel cell system according to an embodiment of the present application will be described with reference to the accompanying drawings.
[0085] Figure 3 4 is a block diagram of a shutdown device for a fuel cell system provided in an embodiment of the present application.
[0086] For example, Figure 3 As shown, the shutdown device 10 of the fuel cell system may include:
[0087] An acquisition module 100 is configured to receive a shutdown instruction of the fuel cell system and acquire the stack impedance of the fuel cell system based on the shutdown instruction;
[0088] A judgment module 200 is used to judge whether the fuel cell system meets a preset shutdown condition based on the stack impedance;
[0089] The control module 300 is used to purge the cathode of the fuel cell in the fuel cell system if the fuel cell system does not meet the preset shutdown condition, until the fuel cell system meets the preset shutdown condition, and control the fuel cell system to shut down.
[0090] Furthermore, in some embodiments, the identification and judgment module 200 is used to: determine whether the stack impedance is less than a preset threshold, wherein the preset threshold is the lower limit value of the optimal impedance range; if the stack impedance is less than the preset threshold, it is determined that the fuel cell system does not meet the preset shutdown conditions; otherwise, it is determined that the fuel cell system meets the preset shutdown conditions.
[0091] Furthermore, in some embodiments, when controlling the shutdown of the fuel cell system, the control module 300 is also used to: continuously monitor whether the stack impedance is less than a preset threshold; if the stack impedance is less than the preset threshold, re-purge the fuel cell cathode in the fuel cell system; otherwise, when the fuel cell system completes the shutdown, end the current monitoring action.
[0092] Furthermore, in some embodiments, the optimal impedance interval is determined by an optimal fuel cell water content range when the fuel cell system is started.
[0093] Furthermore, in some embodiments, after purging the cathode of the fuel cell in the fuel cell system, the control module 300 is also used to: obtain the purge time of the cathode of the fuel cell in the fuel cell system; if the purge time is greater than the preset time, perform an acoustic reminder and / or a visual reminder.
[0094] It should be noted that the above explanation of the fuel cell system shutdown method embodiment is also applicable to the fuel cell system shutdown device of this embodiment, and will not be repeated here.
[0095] According to an embodiment of the present application, a shutdown device for a fuel cell system is configured to, upon receiving a shutdown command from the fuel cell system and determining, based on the fuel cell stack impedance, that the fuel cell system does not meet a preset shutdown condition, purge the cathodes of the fuel cells within the fuel cell system until the fuel cell system meets the preset shutdown condition, thereby controlling the fuel cell system to shut down. Thus, by determining whether the water content of the fuel cell meets certain requirements based on the fuel cell stack impedance, this solves the problem in related technologies of controlling water content through timed purges, which can lead to inaccurate water content control and affect the next startup. This allows for more accurate and effective control of the water content status of the fuel cell, further facilitating the next startup of the fuel cell system.
[0096] An embodiment of the present application provides a fuel cell system, including a shutdown device for the fuel cell system of the above embodiment. Through the shutdown device of the above fuel cell system, the problem in the related art of controlling water content by timed purging, resulting in inaccurate water content control and affecting the next startup, is solved, thereby achieving more accurate and effective control of the water content state of the fuel cell, which is more conducive to the next startup of the fuel cell system.
[0097] An embodiment of the present application also provides a vehicle, comprising the fuel cell system of the above embodiment.
[0098] According to the vehicle of the embodiment of the present application, the above-mentioned fuel cell system solves the problem in the related art of controlling the water content by timed purging, which leads to inaccurate water content control and affects the next startup, thereby achieving more accurate and effective control of the water content status of the fuel cell, which is more conducive to the next startup of the fuel cell system.
[0099] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.
[0100] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
[0101] The above content is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.
Claims
1. A method for shutting down a fuel cell system, characterized in that: The following steps are involved: Receiving a shutdown instruction of the fuel cell system, and acquiring a stack impedance of the fuel cell system based on the shutdown instruction; Based on the stack impedance, determining whether the fuel cell system meets a preset shutdown condition; If the fuel cell system does not meet the preset shutdown condition, the cathode of the fuel cell in the fuel cell system is purged until the fuel cell system meets the preset shutdown condition, and the fuel cell system is controlled to shut down.
2. The method according to claim 1, characterized in that: The determining whether the fuel cell system meets a preset shutdown condition based on the stack impedance includes: Determining whether the stack impedance is less than a preset threshold, wherein the preset threshold is a lower limit of an optimal impedance range; If the stack impedance is less than the preset threshold, it is determined that the fuel cell system does not meet the preset shutdown condition; otherwise, it is determined that the fuel cell system meets the preset shutdown condition.
3. The method according to claim 2, characterized in that When controlling the fuel cell system to shut down, the method further includes: Continuously monitoring whether the stack impedance is less than a preset threshold; If the stack impedance is less than the preset threshold, the cathode of the fuel cell in the fuel cell system is re-purged; otherwise, when the fuel cell system completes shutdown, the current monitoring action is terminated.
4. The method according to claim 3, characterized in that The optimal impedance interval is determined by the optimal hydrogen fuel cell water content range when the fuel cell system is turned on.
5. The method according to claim 1, characterized in that After purging the cathode of the fuel cell in the fuel cell system, the method further comprises: Obtaining a purge duration for purging a cathode of a fuel cell in the fuel cell system; If the purge duration is longer than a preset duration, an acoustic reminder and / or an optical reminder is given.
6. A shutdown device for a fuel cell system, characterized in that: include: An acquisition module, configured to receive a shutdown instruction of a fuel cell system, and acquire a stack impedance of the fuel cell system based on the shutdown instruction; A judgment module, used for judging whether the fuel cell system meets a preset shutdown condition based on the stack impedance; The control module is used to purge the cathode of the fuel cell in the fuel cell system if the fuel cell system does not meet the preset shutdown condition, until the fuel cell system meets the preset shutdown condition, thereby controlling the fuel cell system to shut down.
7. The device according to claim 6, characterized in that The judgment module is specifically used for: Determining whether the stack impedance is less than a preset threshold, wherein the preset threshold is a lower limit of an optimal impedance range; If the stack impedance is less than the preset threshold, it is determined that the fuel cell system does not meet the preset shutdown condition; otherwise, it is determined that the fuel cell system meets the preset shutdown condition.
8. The device according to claim 6, characterized in that When controlling the fuel cell system to shut down, the control module is further used to: Continuously monitoring whether the stack impedance is less than a preset threshold; If the stack impedance is less than the preset threshold, the cathode of the fuel cell in the fuel cell system is re-purged; otherwise, when the fuel cell system completes shutdown, the current monitoring action is terminated.
9. A fuel cell system, characterized in that: include: A shutdown device for a fuel cell system as claimed in any one of claims 6 to 8.
10. A vehicle, characterized in that: include: The fuel cell system as claimed in claim 9.