Purging control method and device of fuel cell system and storage medium

Abstract

The invention discloses a purging control method and device for a fuel cell system and a storage medium, and the method comprises the steps: controlling a working mode of the fuel cell system to be a shutdown purging mode in response to a shutdown instruction; in the shutdown purging mode, the current temperature of an electric pile in the fuel cell system is obtained; under the condition that the current temperature of the galvanic pile meets a preset condition, switching the working mode of the fuel cell system into a galvanic pile heating mode; in the stack heating mode, controlling a cooling subsystem in the fuel cell system to operate in a preset circulation mode; in the preset circulation mode, cooling liquid in the fuel cell system circulates in a water channel in the fuel cell system; and controlling a fan in the fuel cell system to operate at the first preset rotating speed. The galvanic pile is rapidly heated in a low-temperature environment, so that the galvanic pile purging efficiency is improved; and the probability of successful starting of the battery system is improved.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a purge control method, device and storage medium for a fuel cell system. Background Art

[0002] At present, the main factors restricting the commercialization of fuel cell systems include system cost, durability and low-temperature start-up capability. Since the low-temperature cold start performance has a significant impact on system durability and user experience, fuel cell system manufacturers usually use it as an important performance indicator of the stack or system, and solving and improving the system's low-temperature cold start capability is one of the main research directions.

[0003] For fuel cell systems, the low-temperature cold start capability is mainly determined by two processes: process one is the purge before the system is shut down in a low-temperature environment; process two is the start-up load after restarting. Among them, process one largely determines whether process two can proceed smoothly, and the quality of process one execution will also affect the life of the system.

[0004] During the execution of process one, its effectiveness is mainly characterized by the high-frequency impedance value of the stack, that is, the high-frequency impedance value of the stack is monitored during the purge process, and the purge is stopped when the impedance value reaches the target threshold, and the shutdown is completed. At present, a common problem in the industry is that the fuel cell system purges for too long in a low-temperature environment, that is, process one lasts too long, which leads to a lot of hydrogen being wasted during the purge process, and the comprehensive hydrogen consumption per 100 kilometers of the vehicle increases; in addition, if the purge time is shortened, more liquid water will remain inside the system when it is shut down, which will reduce the probability of success when the system is restarted, and because the amount of retained water exceeds the threshold, there is a risk of puncturing the proton exchange membrane or damaging the catalyst layer.

[0005] Since the system purge temperature is relatively high in the currently commonly used purge method, the absolute moisture content in the stack cavity is relatively high at this temperature. After the system condenses in a low temperature environment, the gas temperature in the stack gradually decreases and may drop below 0°C. At this time, due to the rapid drop in saturated vapor pressure caused by the temperature drop, the absolute moisture content at the original higher temperature will change from water vapor to liquid water, that is, condensed water will precipitate and adhere to the parts or pipe walls; when the temperature further drops below 0°C, the condensed water will freeze, which may cause valves, pumps, sensors and other parts to freeze, and the next time the parts are started, there may be problems with the parts being uncontrollable. Summary of the invention

[0006] The present application provides a purge control method, device and storage medium for a fuel cell system, which can improve the efficiency of fuel cell stack purge and the probability of successful startup of the battery system.

[0007] In one aspect, the present application provides a purge control method for a fuel cell system, the method comprising:

[0008] In response to the shutdown instruction, controlling the operation mode of the fuel cell system to be a shutdown purge mode;

[0009] In the shutdown purge mode, obtaining a current temperature of a fuel cell stack in the fuel cell system;

[0010] When the current temperature of the fuel cell stack meets a preset condition, switching the working mode of the fuel cell system to a fuel cell stack heating mode;

[0011] In the stack heating mode, the cooling subsystem in the fuel cell system is controlled to operate in a preset circulation mode; in the preset circulation mode, the coolant in the fuel cell system circulates in the water channel inside the fuel cell system;

[0012] The fan in the fuel cell system is controlled to run at a first preset speed; the fan is used to cool the coolant to obtain the cooled coolant; the cooled coolant is used to cool the stack when the stack purge is completed.

[0013] In an exemplary embodiment, after switching the operating mode of the fuel cell system to the stack heating mode, the method further includes:

[0014] Determining a heating time and an output power of the battery stack according to a current temperature of the battery stack;

[0015] Determining a target charging energy according to the heating time and the output power;

[0016] When the target charging energy is less than or equal to the charging energy threshold corresponding to the fuel cell system, determining the operating parameters of the stack heating process; the operating parameters include the operating parameters of the cooling subsystem and the preset speed of the fan;

[0017] In the stack heating mode, controlling the cooling subsystem in the fuel cell system to operate in a preset circulation mode includes:

[0018] In the stack heating mode, the cooling subsystem in the fuel cell system is controlled to operate in a preset circulation mode based on the operating parameters of the cooling subsystem.

[0019] In an exemplary embodiment, in the stack heating mode, the method further includes:

[0020] Determining the load current and heating amount of the battery stack according to the current temperature of the battery stack;

[0021] The fuel cell system further includes an anode pressure regulating valve, a hydrogen circulation pump, a solenoid valve, a converter, and a heater. After controlling the fan in the fuel cell system to run at a preset speed, the method further includes:

[0022] Controlling the anode pressure regulating valve to perform a pressure regulating operation to adjust the anode pressure to a preset pressure value;

[0023] Controlling the hydrogen circulation pump to perform an anode circulation operation;

[0024] Controlling the solenoid valve to perform a drainage operation to discharge liquid water generated by the battery stack during operation;

[0025] Controlling the converter to pull the voltage to the pull current;

[0026] Based on the heating heat amount, the heater is controlled to perform a heating operation.

[0027] In an exemplary embodiment, after controlling the heater to perform a heating operation, the method further includes:

[0028] Obtaining the cumulative heating time of the heater performing the heating operation;

[0029] When the accumulated heating time is greater than a preset time threshold, the operating mode of the fuel cell system is switched to a stack purge mode.

[0030] In an exemplary embodiment, in the shutdown purge mode, obtaining the current temperature of the fuel cell stack in the fuel cell system includes:

[0031] In the shutdown purge mode, a preset temperature corresponding to the fuel cell system is obtained; the preset temperature is the ambient temperature corresponding to the fuel cell system or the target temperature of the fuel cell system in a future preset period of time;

[0032] When the preset temperature is less than or equal to a first threshold, the current temperature of the fuel cell stack in the fuel cell system is acquired; the first threshold is a temperature threshold for performing low-temperature shutdown purge.

[0033] In an exemplary embodiment, when the current temperature of the fuel cell stack meets a preset condition, switching the operation mode of the fuel cell system to the fuel cell stack heating mode includes:

[0034] Determining a second threshold corresponding to the heating temperature of the fuel cell stack;

[0035] When the current temperature of the fuel cell stack is less than or equal to the second threshold, it is determined that the current temperature of the fuel cell stack meets the preset condition; and the operating mode of the fuel cell system is switched to a fuel cell stack heating mode.

[0036] In an exemplary embodiment, after switching the operating mode of the fuel cell system to the stack purge mode, the method further includes:

[0037] Obtaining a high-frequency impedance value of the battery stack;

[0038] When the high-frequency impedance value is less than or equal to a preset impedance threshold, the current of the battery stack is adjusted from the pull-load current to the first current; the first current is less than the pull-load current, and the preset impedance threshold is the high-frequency impedance threshold for the battery stack to achieve cold start at the temperature of the first threshold;

[0039] Controlling the operation of the regulating valve and the air compressor so that the pressure value of the fuel cell stack meets a first pressure threshold;

[0040] Controlling the fan to run at a second preset speed according to the cooling time or real-time temperature corresponding to the heating module of the fuel cell stack;

[0041] Controlling the anode pressure regulating valve to perform a pressure regulating operation, and controlling the hydrogen circulation pump to perform an anode circulation operation;

[0042] The solenoid valve is controlled to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation.

[0043] In an exemplary embodiment, the method further comprises:

[0044] When the high-frequency impedance value is greater than a preset impedance threshold, performing a two-cavity purge operation;

[0045] Controlling the three-way valve of the cooling system in the fuel cell system to close, and controlling the heater of the cooling system in the fuel cell system to open;

[0046] Controlling the cooling system three-way valve to open, and controlling the cooling system radiator in the fuel cell system to open;

[0047] Obtaining the accumulated purge time corresponding to the two-chamber purge operations;

[0048] When the accumulated purge time is less than or equal to a preset time threshold, adjusting the current of the battery stack from the first current to a second current;

[0049] The solenoid valve is controlled to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation.

[0050] Another aspect provides a purge control device for a fuel cell system, the device comprising:

[0051] A first control module, configured to control the operation mode of the fuel cell system to a shutdown purge mode in response to a shutdown instruction;

[0052] A stack temperature acquisition module, used to acquire the current temperature of the stack in the fuel cell system in the shutdown purge mode;

[0053] A mode switching module, used to switch the working mode of the fuel cell system to a stack heating mode when the current temperature of the stack meets a preset condition;

[0054] A second control module is used to control the cooling subsystem in the fuel cell system to operate in a preset circulation mode in the stack heating mode; in the preset circulation mode, the coolant in the fuel cell system circulates in the water channel inside the fuel cell system;

[0055] The third control module is used to control the fan in the fuel cell system to run at a first preset speed; the fan is used to cool the coolant to obtain the cooled coolant; the cooled coolant is used to cool the stack when the stack purge is completed.

[0056] On the other hand, a purge control device for a fuel cell system is provided, the device comprising a processor and a memory, the memory storing at least one instruction or at least one program, the at least one instruction or the at least one program being loaded and executed by the processor to implement the purge control method for the fuel cell system as described above.

[0057] On the other hand, a computer storage medium is provided, wherein the computer storage medium stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by a processor to implement the purge control method of the fuel cell system as described above.

[0058] On the other hand, a computer program product or a computer program is provided, the computer program product or the computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes to implement the purge control method of the fuel cell system as described above.

[0059] The purge control method, device and storage medium of the fuel cell system provided by the present application have the following technical effects:

[0060] In response to the shutdown instruction, the present application controls the working mode of the fuel cell system to the shutdown purge mode; in the shutdown purge mode, the current temperature of the stack in the fuel cell system is obtained; when the current temperature of the stack meets the preset conditions, the working mode of the fuel cell system is switched to the stack heating mode; in the stack heating mode, the cooling subsystem in the fuel cell system is controlled to operate in a preset circulation mode; in the preset circulation mode, the coolant in the fuel cell system circulates in the water channel inside the fuel cell system; the fan in the fuel cell system is controlled to operate at a first preset speed; the fan is used to cool the coolant to obtain the cooled coolant; the cooled coolant is used to cool the stack when the stack purge is completed. The present application heats the stack quickly in a low temperature environment, thereby improving the stack purge efficiency; and through fan control, the coolant in the radiator is cooled quickly, and a large cycle is started after the stack purge is completed. At this time, the coolant temperature in the radiator is low, which can cool the temperature in the cathode and anode cavities, thereby condensing and precipitating the gaseous water in the gas and discharging it from the system. It effectively avoids the residual liquid water in the battery system and the risk of residual liquid water piercing the proton exchange membrane or damaging the catalyst layer; and improves the probability of successful startup of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions and advantages of the embodiments of this specification or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0062] Figure 1 is a schematic diagram of a purge control system of a fuel cell system provided in an embodiment of this specification;

[0063] Figure 2 This is a curve showing the change of high-frequency impedance value at different cooling subsystem temperatures during the system purge process provided in the embodiment of this specification.

[0064] Figure 3 is a flow chart of a purge control method for a fuel cell system provided in an embodiment of this specification;

[0065] Figure 4 It is a flow chart of a purging method in a stack heating mode provided in an embodiment of this specification;

[0066] Figure 5 is a flow chart of a method for switching the working mode of the fuel cell system to the stack purge mode provided in an embodiment of this specification;

[0067] Figure 6It is a flow chart of a rapid heating method of a fuel cell system provided in an embodiment of this specification;

[0068] Figure 7 It is a flow chart of a method for adjusting load current provided in an embodiment of this specification;

[0069] Figure 8 It is a flow chart of a stack purging method provided in an embodiment of this specification;

[0070] Fig. 9 It is a flow chart of a purging method in a two-chamber purging mode provided in an embodiment of this specification;

[0071] Fig.10 It is a schematic flow chart of a two-chamber purging method provided in an embodiment of this specification;

[0072] Fig.11 is a structural schematic diagram of a purge control device for a fuel cell system provided in an embodiment of this specification;

[0073] Fig.12 It is a structural diagram of a server provided in an embodiment of this specification. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0075] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. 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 server that includes 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.

[0076] See also Figure 1 , Figure 1 Schematic diagram of a purge control system of a fuel cell system provided in an embodiment of this specification. The codes and corresponding names of the components in the system are as follows:

[0077] 101: Hydrogen pressure regulating valve, providing hydrogen with a certain flow rate and pressure required during system operation;

[0078] 102: pressure sensor, used to monitor the pressure value of the anode of the battery stack, which is the target value in the closed-loop regulation of 101;

[0079] 103: Anode inlet of the stack, hydrogen inlet;

[0080] 104: Anode outlet of the stack, outlet for hydrogen;

[0081] 105: a gas-water separator, used to separate hydrogen and liquid water in the mixed gas after 104;

[0082] 106: a hydrogen circulation pump, used to recover the hydrogen separated from 105 and then transport the hydrogen to 103;

[0083] 107: Drain solenoid valve, used to discharge the liquid water and hydrogen-nitrogen mixed gas separated from 105;

[0084] 201: Air filter, used to filter particulate matter and some harmful gases in the air;

[0085] 202: a temperature sensor, used to monitor the temperature of the air after entering 201;

[0086] 203: Air compressor, providing hydrogen with a certain flow rate and pressure required during the operation of the system;

[0087] 204: intercooler, used to cool the air whose temperature rises during the compression process of 203;

[0088] 205: Humidifier, using the wet air after leaving the pile to humidify the dry air before entering the pile;

[0089] 206: Air inlet regulating valve, used to adjust the flow rate and pressure of air entering the stack;

[0090] 207: Air inlet pressure sensor, used to monitor the pressure of air inlet;

[0091] 208: Cathode inlet of the stack, air inlet;

[0092] 209: stack cathode outlet, air outlet;

[0093] 210: Air outlet regulating valve, mainly plays the role of cutting off and sealing;

[0094] 211: Air bypass regulating valve, used to adjust the flow and pressure of bypass air;

[0095] 212: Tail exhaust mixed gas, used to discharge anode hydrogen and cathode air, and plays a dilution role;

[0096] 301: Expansion water tank, used to stabilize the pressure of the cooling system and provide sufficient coolant;

[0097] 302: water pump, used to transport coolant to the fuel cell stack;

[0098] 303: Inlet of the stack cooling circuit, inlet of the coolant into the stack;

[0099] 304: stack cooling outlet, coolant outlet;

[0100] 305: Coolant outlet temperature sensor, monitors the coolant outlet temperature and provides a temperature control target value for the cooling system;

[0101] 306: Cooling system three-way valve, used to adjust the flow through the radiator;

[0102] 307: cooling system radiator, used to reduce the coolant temperature at the outlet of the fuel cell stack to a target value;

[0103] 308: Cooling system heater, used to heat the coolant and increase the coolant inlet temperature under specific working conditions;

[0104] 401: a DC / DC converter, used to convert the current and voltage values ​​output by the battery stack into target current and voltage values ​​of the power demand device;

[0105] 402: current output interface;

[0106] 403: current input interface;

[0107] 501: Fuel cell, a place where hydrogen and oxygen undergo electrochemical reactions and output electricity;

[0108] 601: Fuel cell system control unit

[0109] 701: Complete vehicle or other electrical equipment

[0110] The description for the fuel cell system is as follows:

[0111] 1. Fuel cell system: The fuel cell system control unit 601 is connected and communicated with the vehicle or other power-consuming equipment 701, and executes the startup procedure and generates electricity after obtaining the power demand; if the power generation is terminated during operation, the load reduction, purge and shutdown commands are executed; the fuel cell system control unit 601 controls all fuel cell system components and responds to the power demand of the system;

[0112] 2. Anode subsystem: High-pressure hydrogen is connected to the hydrogen pressure regulating valve 101. During system operation, according to the instruction of 601, the hydrogen inlet pressure sensor 102 is used as the target pressure value to adjust the inlet hydrogen to the corresponding pressure value;

[0113] 3. Since liquid water may penetrate from the cathode to the anode during the operation of the stack, the system may be flooded during operation. To solve this problem, the anode is generally equipped with a gas-water separator 105 and a hydrogen circulation pump 106; the hydrogen circulation pump 106 runs at a high speed during the operation of the system, providing a hydrogen flow rate higher than the consumption of the stack; this part of hydrogen has the function of sweeping out liquid water at the anode of the stack; therefore, during the operation of the stack, hydrogen, liquid water, and gaseous water are discharged from the anode outlet of the stack; after separation by the gas-water separator 105, the liquid water is discharged to the tail drain through the drainage solenoid valve 107, while the hydrogen / water vapor is circulated again to the anode inlet 103 of the stack through the hydrogen circulation pump;

[0114] 4. Cathode subsystem: After receiving the instruction from the fuel cell control unit 601, the air compressor 203 runs at high speed. Driven by the air compressor, the air passes through the air filter 201 and the air compressor 203. Since the air temperature rises significantly after being compressed by the air compressor, an intercooler 204 is configured at the cathode to cool the air. After passing through the intercooler, the air enters the membrane humidifier 205 and the air regulating valve 211. The air regulating valve 211 is mainly used to avoid surging of the air compressor and dilute the hydrogen entrained in the anode drainage during the purge process. The membrane humidifier 205 is internally divided into two flow channels, namely, a dry gas flow channel and a wet gas flow channel. The liquid water in the wet gas flow channel penetrates into the dry gas flow channel through the membrane or fiber tube, thereby achieving the purpose of humidifying the dry gas. After humidification, the dry gas enters the air inlet regulating valve 206 and then enters the cathode of the stack. After the reaction, the remaining air is discharged from the stack and enters the wet gas flow channel of the membrane humidifier 205. After passing through the air outlet regulating valve 210, it is discharged to the dilution device 212, wherein 210 is mainly used to adjust the cathode pressure and flow.

[0115] 5. Cooling subsystem: The expansion water tank 301 has a pressure stabilization function; after receiving the operation command from the fuel cell system control unit 601, the water pump 302 runs at high speed according to the command; driven by 301, the coolant enters the cooling chamber of the fuel cell stack 501 and the intercooler 204 respectively, so as to achieve the purpose of cooling the fuel cell stack and the air; the fuel cell stack coolant flows from the cooling chamber outlet to the three-way valve 306 after passing through the fuel cell stack; the intercooler coolant flows to 306 after passing through the intercooler; the two coolants are mixed and flow to the radiator 307 or the heater 308 through 306 in different modes; then the coolant returns to the inlet of the water pump 302 to complete a cycle.

[0116] 6. Power subsystem: The DCDC converter 401 performs the current / voltage conversion function during the system power generation process, so that the current / voltage meets the requirements of 701; at the same time, the stack 501 impedance device is also integrated in 401, which can monitor the high-frequency impedance value of the stack 501 during operation, so as to determine the water content inside the stack.

[0117] The high-frequency impedance value of the battery stack characterizes the amount of water content inside the battery stack to a certain extent. This scheme studies the factors that affect the change of the high-frequency impedance value during the purge process, as follows:

[0118] like Figure 2 As shown, Figure 2 The following is the curve of the high-frequency impedance value during system purge at different cooling subsystem temperatures (T1<T2<T3<T4<T5). It can be seen that with the increase of the cooling subsystem temperature, the high-frequency impedance value increases exponentially, that is, the higher the cooling subsystem temperature, the higher the efficiency of system purge. The cooling subsystem temperature has a great influence on the purge efficiency, mainly because the increase in temperature changes the form and path of water discharge from the membrane electrode.

[0119] Specifically, the higher the temperature, the higher the saturated vapor pressure of water, which can be fitted into the following curve:

[0120] Y=0.124*X3-3.358*X2+57.074X+1569

[0121] Where Y is the saturated vapor pressure in Pa; X is the temperature in °C.

[0122] In order to make the impedance of the fuel cell stack rise rapidly, it is necessary to increase the temperature. However, the problem caused by this is that the high temperature causes the absolute moisture content of water in the fuel cell stack cavity to be higher. When the gas in the fuel cell stack cavity decreases with the temperature, the absolute moisture content at the original higher temperature will change from water vapor to liquid water, that is, condensed water will precipitate, and the condensed water will adhere to the walls of components or pipelines. When the temperature is further reduced to below 0°C, the condensed water will freeze, which may cause valves, pump bodies, sensors and other components to freeze. When it is started next time, there may be problems with the components being uncontrollable.

[0123] It can be seen that in order to effectively perform the low-temperature shutdown purge action, the stack needs to be heated up; in order to avoid condensation of high-temperature water vapor, the stack needs to be cooled down to precipitate and remove liquid water. The method of this embodiment enables rapid heating and cooling to be achieved in a distributed manner during the system shutdown purge.

[0124] The following describes a purge control method for a fuel cell system of the present application. Figure 3It is a flow chart of a purge control method for a fuel cell system provided in an embodiment of this specification. This specification provides method operation steps as described in the embodiment or flow chart, but may include more or fewer operation steps based on conventional or non-creative labor. The order of steps listed in the embodiment is only one way of executing the steps among many orders, and does not represent the only order of execution. When the actual system or server product is executed, it can be executed in sequence or in parallel (for example, in a parallel processor or multi-threaded processing environment) according to the method shown in the embodiment or the accompanying drawings. Specifically, Figure 3 As shown, the method can be applied to a control unit in a fuel cell system, and the method may include:

[0125] S301: In response to a shutdown instruction, control the operation mode of the fuel cell system to a shutdown purge mode.

[0126] In the embodiments of the present specification, after receiving the shutdown command, a shutdown command may be sent to the fuel cell system so that the fuel cell system enters the shutdown purge mode marking position.

[0127] S303: In the shutdown purge mode, obtaining the current temperature of the fuel cell stack in the fuel cell system.

[0128] In the embodiment of this specification, obtaining the current temperature of the fuel cell stack in the power-off purge mode includes:

[0129] In the shutdown purge mode, a preset temperature corresponding to the fuel cell system is obtained; the preset temperature is the ambient temperature corresponding to the fuel cell system or the target temperature of the fuel cell system in a future preset period of time;

[0130] When the preset temperature is less than or equal to a first threshold, the current temperature of the fuel cell stack in the fuel cell system is acquired; the first threshold is a temperature threshold for performing low-temperature shutdown purge.

[0131] In the embodiment of this specification, the method further includes:

[0132] When the preset temperature is greater than the first threshold, a normal purge operation or a shutdown operation is performed on the fuel cell system.

[0133] In the embodiment of this specification, the target temperature may be the lowest temperature estimated by the control unit for the next several hours. The first threshold is the temperature threshold Ti for executing low temperature shutdown and purge, which may be set according to actual conditions.

[0134] S305: When the current temperature of the fuel cell stack meets a preset condition, switching the operating mode of the fuel cell system to a fuel cell stack heating mode.

[0135] In the embodiment of the present specification, when the current temperature of the fuel cell stack meets a preset condition, switching the working mode of the fuel cell system to the fuel cell stack heating mode includes:

[0136] Determining a second threshold corresponding to the heating temperature of the fuel cell stack;

[0137] When the current temperature of the fuel cell stack is less than or equal to the second threshold, it is determined that the current temperature of the fuel cell stack meets the preset condition; and the operating mode of the fuel cell system is switched to a fuel cell stack heating mode.

[0138] In some embodiments, the method further comprises:

[0139] When the current temperature of the fuel cell stack is greater than the second threshold, the operating mode of the fuel cell system is switched to a fuel cell stack purge mode.

[0140] In the embodiment of the present specification, the second threshold value Tr is a threshold temperature for determining whether the stack needs to be heated, and the value is stored in the control unit.

[0141] S307: In the stack heating mode, controlling the cooling subsystem in the fuel cell system to operate in a preset circulation mode; in the preset circulation mode, the coolant in the fuel cell system circulates in a water channel inside the fuel cell system.

[0142] In an embodiment of the present specification, in the stack heating mode, controlling the cooling subsystem in the fuel cell system to operate in a preset circulation mode includes:

[0143] In the stack heating mode, controlling the stack regulating valve and the air compressor to operate according to first preset parameters so that the pressure value of the stack reaches a target pressure value;

[0144] The cooling subsystem in the fuel cell system is controlled to operate in a preset cycle mode.

[0145] In the embodiment of this specification, the first preset parameter can be set according to the target pressure value, and the preset circulation mode is a small circulation mode, in which the coolant circulates only in the water channel inside the engine, and the large circulation mode is that the coolant circulates through the radiator outside the engine; the switching of the two circulation modes is completed by the thermostat. The air subsystem performs the pressure regulating function of the stack regulating valve 210 and sets the target pressure value Pc.

[0146] S309: Control the fan in the fuel cell system to run at a first preset speed; the fan is used to cool the coolant to obtain cooled coolant; the cooled coolant is used to cool the fuel cell stack when the stack purge is completed.

[0147] In the embodiment of the present specification, after the operation mode of the fuel cell system is switched to the stack heating mode in step S305, the method further includes:

[0148] Determining a heating time and an output power of the battery stack according to a current temperature of the battery stack;

[0149] Determining a target charging energy according to the heating time and the output power;

[0150] When the target charging energy is less than or equal to a charging energy threshold corresponding to the fuel cell system, the operating parameters of the stack heating process are determined; the operating parameters include the operating parameters of the cooling subsystem and the preset speed of the fan.

[0151] Correspondingly, in step S307, in the stack heating mode, controlling the cooling subsystem in the fuel cell system to operate in a preset circulation mode includes:

[0152] In the stack heating mode, the cooling subsystem in the fuel cell system is controlled to operate in a preset circulation mode based on the operating parameters of the cooling subsystem.

[0153] In the embodiment of this specification, in the stack heating mode, if Figure 4 As shown, the method also includes:

[0154] S401: Determine the load current and heating amount of the fuel cell stack according to the current temperature of the fuel cell stack;

[0155] The fuel cell system further includes an anode pressure regulating valve, a hydrogen circulation pump, a solenoid valve, a converter, and a heater. After controlling the fan in the fuel cell system to run at a preset speed, the method further includes:

[0156] S403: Controlling the anode pressure regulating valve to perform a pressure regulating operation to adjust the anode pressure to a preset pressure value;

[0157] S405: Controlling the hydrogen circulation pump to perform an anode circulation operation;

[0158] S407: Control the solenoid valve to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation;

[0159] S409: Control the converter to pull the voltage to the pull current;

[0160] S4011: Based on the heating amount, control the heater to perform a heating operation.

[0161] In the embodiments of this specification, the electronic load is an electronic device that simulates a load and can test the performance parameters of a power supply under different load conditions. The pull current refers to the maximum current value pulled by the electronic load in the constant current mode of the electronic load.

[0162] In the embodiments of this specification, Figure 5 As shown, after controlling the heater to perform a heating operation, the method further includes:

[0163] S4013: Obtaining the cumulative heating time of the heater performing the heating operation;

[0164] S4015: When the accumulated heating time is greater than a preset time threshold, the operating mode of the fuel cell system is switched to a stack purge mode.

[0165] In the embodiments of this specification, the preset time threshold can be set according to the actual situation. If the cumulative heating time does not reach the preset time threshold, the working mode of the fuel cell system will not be switched. In order to avoid damage to the stack due to long-term heating operation, the cumulative heating time is set to be less than Ts-min. When the system detects that the cumulative heating time exceeds Ts-min, the system will forcibly execute the stack purge instruction, otherwise the heating module of the stack will still be executed.

[0166] In an exemplary embodiment, Figure 6 As shown, Figure 6 The present invention is a schematic flow chart of a rapid heating method for a fuel cell system, comprising:

[0167] S01: The system sends a shutdown command to the fuel cell system.

[0168] S02: The fuel cell system enters the shutdown purge mode flag.

[0169] S03: T202 is the ambient temperature, or it can be the lowest temperature in the next few hours estimated by the control unit 601. Ti is the threshold temperature for executing low-temperature shutdown purge, and the Ti value is stored in the control unit 601. When T202>Ti, it is judged as yes, there is no need to execute the normal purge instruction, and directly enter the normal purge instruction or shutdown program; when T305>Ti, it is judged as no, it is necessary to execute the low-temperature shutdown purge mode, and the system will enter S04.

[0170] S04: T305 is the temperature value of the cooling system stack outlet, Tr is the threshold temperature for judging whether the stack needs to be heated, and this value is stored in the control unit 601; when T305>Tr, directly enter the stack purge instruction. If not satisfied, enter the stack heating module.

[0171] S05: After entering the heating module of the battery stack, the control unit calculates the battery stack heating heat Qc, the battery stack heating time th, the battery stack load current Is, and the system output power Ps.

[0172] S06: At this time, there is a possibility that the SOC of the vehicle's power battery is too high, so it is necessary to determine whether the power battery allows the system to output power Ps for a duration of th; define Es = Ps*th, when Es ≤ the charging energy allowed by the battery, perform the heating action; if not satisfied, return to S05.

[0173] S07: The control unit 601 determines the action parameters of each actuator of the system.

[0174] S08 : the air subsystem controls the opening of the out-of-stack regulating valve 210 , the in-stack regulating valve 206 , and the bypass regulating valve 211 .

[0175] S09: The air subsystem executes the air compressor speed Rac.

[0176] S10: The air subsystem performs the pressure regulating function of the stack regulating valve 210, with the target pressure value being Pc.

[0177] S11: The cooling subsystem executes the 306 regulation function, and at this time, 306 to 308 are required to be fully open, and 306 to 307 are required to be fully closed.

[0178] S12: The cooling subsystem executes the water pump speed function.

[0179] S13: The fan opens to Rwc, at which point the cooling subsystem starts a small cycle and the stack is in a heating state; at the same time, the coolant in the radiator is at a relatively high temperature, and the fan is turned on to cool the coolant in the radiator. After the stack purge is completed, low-temperature coolant is used to cool the stack.

[0180] S14: Execute the pressure regulating function of the anode pressure regulating valve 101 to adjust the anode pressure to Pa.

[0181] S15: Execute the anode circulation function of the hydrogen circulation pump.

[0182] S16: Execute the drainage function of the solenoid valve 107 to discharge the liquid water generated by the operation of the fuel cell stack.

[0183] S17: Execute 401 to pull the voltage to Is.

[0184] S18: Execute the heating function of the heater 308.

[0185] S19: In order to avoid damage to the battery stack due to long-term heating operation, the cumulative heating time is set to be less than Ts-min. When the system detects that the cumulative heating time exceeds Ts-min, the system forces the battery stack to purge the instruction, otherwise the heating module of the battery stack is still executed.

[0186] In the embodiments of this specification, Figure 7 As shown, after the operating mode of the fuel cell system is switched to the stack purge mode, the method further includes:

[0187] S701: Obtaining a high-frequency impedance value of the battery stack;

[0188] S703: When the high-frequency impedance value is less than or equal to a preset impedance threshold, adjusting the current of the battery stack from the pull-load current to a first current Ip; the first current Ip is less than the pull-load current, and the preset impedance threshold is a high-frequency impedance threshold for the battery stack to achieve cold start at a temperature of the first threshold;

[0189] S705: Control the regulating valve and the air compressor to operate so that the pressure value of the fuel cell stack meets the first pressure threshold value Pap;

[0190] S707: According to the cooling time or real-time temperature corresponding to the heating module of the fuel cell stack, controlling the fan to run at a second preset speed; the fan opening corresponding to the second preset speed is Rwp;

[0191] S709: controlling the anode pressure regulating valve to perform a pressure regulating operation, and controlling the hydrogen circulation pump to perform an anode circulation operation;

[0192] S7011: Control the solenoid valve to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation.

[0193] In the embodiment of the present specification, before controlling the solenoid valve to perform a drainage operation to discharge liquid water generated by the stack during operation, the method further includes:

[0194] Controlling the operation of the regulating valve and the air compressor so that the pressure value of the fuel cell stack meets a second pressure threshold;

[0195] Controlling the fan to run at a third preset speed according to the cooling time or real-time temperature corresponding to the heating module of the fuel cell stack;

[0196] The anode pressure regulating valve is controlled to perform a pressure regulating operation, and the hydrogen circulation pump is controlled to perform an anode circulation operation.

[0197] In order to avoid damage to the stack or waste of hydrogen due to long-term stack purge, the cumulative purge time is set to be less than Tp-min. When the system detects that the cumulative heating time exceeds Tp-min, the system forcibly ends the stack purge instruction and enters the two-chamber purge module. Otherwise, the stack purge module will still be carried out.

[0198] In an exemplary embodiment, Figure 8 As shown, Figure 8 The present invention is a schematic flow diagram of a stack purge method, comprising:

[0199] P01: The system receives the stack purge command.

[0200] P02: Turn off the 308 heating function.

[0201] P03: Detect the high-frequency impedance value Rs of the battery stack 501 through 401. When Rs>Rs-min value, jump directly to Y01 to purge the two chambers of the system, otherwise enter P04. Among them, Rs-min is the minimum high-frequency impedance value of the battery stack that can achieve cold start at Ti temperature, which represents the maximum water content of the battery stack for successful cold start under this condition.

[0202] P04: Convert the stack current from Is of the stack heating module to Ip. Generally, Ip is smaller than Is.

[0203] P05: Execute the opening of the out-of-stack regulating valve 210, execute the opening of the in-stack regulating valve 206, and execute the closing of the bypass regulating valve 211. This step is mainly to obtain one of the air conditions that meet the Ip operation.

[0204] P06: Execute the air compressor purge speed Rp.

[0205] P07: Execute the pressure regulating function of the stack regulating valve 210 to adjust the pressure of the air subsystem to Pcp. It should be noted that P05, P06, and P07 can also be achieved through closed-loop regulation.

[0206] P08: Execute the 306 adjustment function to adjust the flow distribution of 307 or 308. Generally speaking, the flow adjustment of the cooling subsystem is small in this step, that is, only a small flow in 307 enters 501. On the one hand, it is used to maintain a high purge temperature, and on the other hand, it can ensure that the internal temperature of 501 is not too high.

[0207] P09: Execute the water pump speed function.

[0208] P10: Execute the fan opening Rwp. In this step, Rwp can be set according to system requirements. When the cooling time in the battery stack heating module is insufficient, the fan opening can be maintained or increased; when the temperature in the battery stack heating module has reached the required value, the speed can be reduced.

[0209] P11: Execute the pressure regulating function of anode pressure regulating valve 101, target pressure value Pap.

[0210] P12: Execute the circulation function of the circulation pump 106. In actual operation, this step can be omitted.

[0211] P13: Execute the drainage function of solenoid valve 107.

[0212] P14: In order to avoid damage to the stack or waste of hydrogen due to long-term stack purge, the cumulative purge time is set to be less than Tp-min. When the system detects that the cumulative heating time exceeds Tp-min, the system forcibly ends the stack purge instruction and enters the two-chamber purge module. Otherwise, the stack purge module is still carried out until P03 is established.

[0213] In the embodiments of this specification, Fig. 9 As shown, Fig. 9 Schematic diagram of a flow chart of a purging method in a two-chamber purging mode, the method further comprising:

[0214] S901: When the high-frequency impedance value is greater than a preset impedance threshold, performing a two-cavity purge operation;

[0215] S903: Controlling the three-way valve of the cooling system in the fuel cell system to close, and controlling the heater of the cooling system in the fuel cell system to open;

[0216] S905: Control the cooling system three-way valve to open, and control the cooling system radiator in the fuel cell system to open;

[0217] S907: Obtaining the accumulated purge time corresponding to the two-chamber purge operation;

[0218] S909: When the accumulated purge time is less than or equal to a preset time threshold Ty-min, adjusting the current of the fuel cell stack from the first current to a second current Iy;

[0219] S9011: Control the solenoid valve to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation.

[0220] In an exemplary embodiment, Fig.10 As shown, Fig.10 The figure is a schematic flow diagram of a two-chamber purge method, comprising:

[0221] Y01: The system receives a two-chamber purge command.

[0222] Y02: Execute 306 to close the 308 passage, and execute 306 to open the 307 passage. The temperature of the battery stack is lowered by opening the coolant in 307. Generally speaking, the temperature of 307 should be above the freezing point. On the one hand, it ensures that the battery stack can be quickly cooled to the expected temperature, and on the other hand, it ensures that the water in the battery stack will not freeze under the two-chamber purge module.

[0223] Y03: Ty is the accumulated two-chamber purge time of the system, and Ty-min is the shortest time that can ensure that the liquid water in the two chambers is fully purged. This value can be determined according to the temperature value of the coolant in 307 when the two-chamber purge module starts. The lower the temperature, the smaller the Ty-min; the higher the temperature, the higher the Ty-min.

[0224] Y04: Set the current from Ip to Iy. The main purpose of this current is to make the average cell voltage of the fuel cell stack lower than the set value, thereby reducing the impact of high voltage on the life of the fuel cell stack.

[0225] Y05: Execute the opening of the out-of-stack regulating valve 210, execute the opening of the in-stack regulating valve 206, and execute the closing of the bypass regulating valve 211. This step is mainly to obtain one of the air conditions that meet the Iy operation.

[0226] Y06: Execute the air compressor purge speed Ry.

[0227] Y07: Execute the pressure regulating function of the stack regulating valve 210 to adjust the pressure of the air subsystem to Pcy. It should be noted that Y05, Y06, and Y07 can also be achieved through closed-loop regulation.

[0228] Y08: Execute the water pump speed function.

[0229] Y09: Execute fan opening Rwy. In this step, Rwy can be set according to system requirements. When the cooling time in the battery stack heating module is insufficient, the fan opening can be maintained or increased; when the temperature in the battery stack heating module has reached the required value, the speed can be reduced.

[0230] Y10: Execute the pressure regulating function of anode pressure regulating valve 101, target pressure value Pap.

[0231] Y11: Execute the circulation function of the circulation pump 106. In actual operation, this step can be omitted.

[0232] Y12: Execute the drainage function of solenoid valve 107.

[0233] On the one hand, this embodiment realizes the function of heating the battery stack through a small cycle, which can quickly heat the battery stack in a low-temperature environment and improve the efficiency of battery stack purge; on the other hand, the cooling fan is controlled to quickly cool the coolant in the radiator, and the large cycle is started after the battery stack purge is completed. At this time, the coolant temperature in the radiator is relatively low, which can cool the temperature in the cathode and anode cavities, thereby condensing and precipitating the gaseous water in the gas and discharging it from the system. The purge efficiency of the system is effectively improved and the energy consumption of purge is reduced. The success probability of the next cold start is effectively increased; the system purge time in a low-temperature environment is greatly shortened, and the user experience is improved.

[0234] It can be seen from the technical solutions provided in the above embodiments of this specification that in response to the shutdown instruction, the embodiments of this specification control the working mode of the fuel cell system to the shutdown purge mode; in the shutdown purge mode, the current temperature of the stack in the fuel cell system is obtained; when the current temperature of the stack meets the preset conditions, the working mode of the fuel cell system is switched to the stack heating mode; in the stack heating mode, the cooling subsystem in the fuel cell system is controlled to operate in a preset circulation mode; in the preset circulation mode, the coolant in the fuel cell system circulates in the water channel inside the fuel cell system; the fan in the fuel cell system is controlled to operate at a first preset speed; the fan is used to cool the coolant to obtain the cooled coolant; the cooled coolant is used to cool the stack when the stack purge is completed. The present application heats the stack quickly in a low temperature environment, thereby improving the stack purge efficiency; and through fan control, the coolant in the radiator is quickly cooled, and a large cycle is started after the stack purge is completed. At this time, the coolant temperature in the radiator is low, which can cool the temperature in the cathode and anode cavities, thereby condensing and precipitating the gaseous water in the gas and discharging it from the system. It effectively avoids the residual liquid water in the battery system and the risk of residual liquid water piercing the proton exchange membrane or damaging the catalyst layer; and improves the probability of successful startup of the battery system.

[0235] The present specification also provides a fuel cell system purge control device, such as Fig.11 As shown, the device comprises:

[0236] The first control module 1110 is used to control the working mode of the fuel cell system to a shutdown purge mode in response to a shutdown instruction;

[0237] A stack temperature acquisition module 1120, configured to acquire the current temperature of the stack in the fuel cell system in the shutdown purge mode;

[0238] A mode switching module 1130 is used to switch the working mode of the fuel cell system to a stack heating mode when the current temperature of the stack meets a preset condition;

[0239] The second control module 1140 is used to control the cooling subsystem in the fuel cell system to operate in a preset circulation mode in the stack heating mode; in the preset circulation mode, the coolant in the fuel cell system circulates in the water channel inside the fuel cell system;

[0240] The third control module 1150 is used to control the fan in the fuel cell system to run at a first preset speed; the fan is used to cool the coolant to obtain the cooled coolant; the cooled coolant is used to cool the fuel cell stack when the stack purge is completed.

[0241] In some embodiments, the apparatus further comprises:

[0242] A power determination module, used to determine the heating time and output power of the battery stack according to the current temperature of the battery stack;

[0243] a target charging energy determination module, configured to determine a target charging energy according to the heating time and the output power;

[0244] A parameter determination module, used to determine the operating parameters of the stack heating process when the target charging energy is less than or equal to the charging energy threshold corresponding to the fuel cell system; the operating parameters include the operating parameters of the cooling subsystem and the preset speed of the fan;

[0245] Accordingly, the second control module includes:

[0246] A parameter control unit is used to control the cooling subsystem in the fuel cell system to operate in a preset circulation mode based on the operating parameters of the cooling subsystem in the stack heating mode.

[0247] In some embodiments, in the stack heating mode, the device further comprises:

[0248] A heat determination module, used to determine the load current and heating heat of the battery stack according to the current temperature of the battery stack;

[0249] The fuel cell system further includes an anode pressure regulating valve, a hydrogen circulation pump, a solenoid valve, a converter and a heater, and the device further includes:

[0250] A pressure regulating module, used to control the anode pressure regulating valve to perform a pressure regulating operation, and adjust the anode pressure to a preset pressure value;

[0251] A circulation operation control module, used to control the hydrogen circulation pump to perform an anode circulation operation;

[0252] A drainage module, used to control the solenoid valve to perform a drainage operation to discharge liquid water generated by the battery stack during operation;

[0253] A current control module, used for controlling the converter to pull the voltage to the pull current;

[0254] The heating control module is used to control the heater to perform a heating operation based on the heating heat.

[0255] In some embodiments, the apparatus further comprises:

[0256] A duration acquisition module, used to acquire the cumulative heating duration of the heater performing the heating operation;

[0257] A mode switching module is used to switch the working mode of the fuel cell system to a stack purge mode when the cumulative heating time is greater than a preset time threshold.

[0258] In some embodiments, the stack temperature acquisition module includes:

[0259] A preset temperature acquisition unit, used to acquire a preset temperature corresponding to the fuel cell system in the shutdown purge mode; the preset temperature is an ambient temperature corresponding to the fuel cell system or a target temperature of the fuel cell system in a future preset period of time;

[0260] The current temperature acquisition unit is used to acquire the current temperature of the fuel cell stack in the fuel cell system when the preset temperature is less than or equal to a first threshold value; the first threshold value is the temperature threshold value for performing low-temperature shutdown purge.

[0261] In some embodiments, the mode switching module includes:

[0262] a second threshold value determining unit, configured to determine a second threshold value corresponding to the heating temperature of the fuel cell stack;

[0263] A mode switching unit is used to determine that the current temperature of the fuel cell stack meets the preset condition when the current temperature of the fuel cell stack is less than or equal to the second threshold; and switch the working mode of the fuel cell system to the fuel cell stack heating mode.

[0264] In some embodiments, the apparatus further comprises:

[0265] An impedance value acquisition module, used to obtain the high-frequency impedance value of the battery stack;

[0266] A first current regulating module, configured to regulate the current of the battery stack from a pull-load current to a first current when the high-frequency impedance value is less than or equal to a preset impedance threshold; the first current is less than the pull-load current, and the preset impedance threshold is a high-frequency impedance threshold for the battery stack to achieve cold start at a temperature of the first threshold;

[0267] A first pressure regulating module, used to control the operation of the regulating valve and the air compressor so that the pressure value of the fuel cell stack meets a first pressure threshold;

[0268] A second speed control module, used for controlling the fan to run at a second preset speed according to the cooling time or real-time temperature corresponding to the heating module of the fuel cell stack;

[0269] An operation control module, used to control the anode pressure regulating valve to perform a pressure regulating operation, and control the hydrogen circulation pump to perform an anode circulation operation;

[0270] The first drainage module is used to control the solenoid valve to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation.

[0271] In some embodiments, the apparatus may further include:

[0272] A two-cavity purge control module, used for performing a two-cavity purge operation when the high-frequency impedance value is greater than a preset impedance threshold;

[0273] A heater control module, used to control the three-way valve of the cooling system in the fuel cell system to close, and to control the heater of the cooling system in the fuel cell system to open;

[0274] A radiator control module, used to control the opening of the cooling system three-way valve and the opening of the cooling system radiator in the fuel cell system;

[0275] A cumulative time acquisition module, used to acquire the cumulative purge time corresponding to the two-chamber purge operation;

[0276] a second current regulating module, configured to regulate the current of the battery stack from the first current to a second current when the accumulated purge time is less than or equal to a preset time threshold;

[0277] The second drainage module is used to control the solenoid valve to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation.

[0278] The device and method embodiments in the described device embodiments are based on the same inventive concept.

[0279] An embodiment of the present specification provides a purge control device for a fuel cell system, the device comprising a processor and a memory, the memory storing at least one instruction or at least one program, the at least one instruction or at least one program being loaded and executed by the processor to implement a purge control method for a fuel cell system as provided in the above method embodiment.

[0280] An embodiment of the present application also provides a computer storage medium, which can be set in a terminal to store at least one instruction or at least one program related to a purge control method for a fuel cell system in a method embodiment. The at least one instruction or at least one program is loaded and executed by the processor to implement the purge control method for the fuel cell system provided in the above method embodiment.

[0281] The embodiment of the present application also provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes to implement the purge control method of the fuel cell system provided by the above method embodiment.

[0282] Optionally, in the embodiments of this specification, the storage medium may be located in at least one of the multiple network servers of the computer network. Optionally, in this embodiment, the storage medium may include, but is not limited to: a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and other media that can store program codes.

[0283] The memory described in the embodiments of this specification can be used to store software programs and modules, and the processor executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, application programs required for functions, etc.; the data storage area may store data created according to the use of the device, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory may also include a memory controller to provide the processor with access to the memory.

[0284] The fuel cell system purge control method embodiment provided in the embodiments of this specification can be executed in a mobile terminal, a computer terminal, a server or a similar computing device. Taking running on a server as an example, Fig.12 1 is a hardware structure block diagram of a server of a fuel cell system purge control method provided in an embodiment of this specification. Fig.12As shown, the server 1200 may have relatively large differences due to different configurations or performances, and may include one or more central processing units (CPU) 1210 (the central processing unit 1210 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 1230 for storing data, and one or more storage media 1220 (such as one or more mass storage devices) for storing application programs 1223 or data 1222. Among them, the memory 1230 and the storage medium 1220 can be short-term storage or permanent storage. The program stored in the storage medium 1220 may include one or more modules, each of which may include a series of instruction operations on the server. Furthermore, the central processing unit 1210 can be configured to communicate with the storage medium 1220 and execute a series of instruction operations in the storage medium 1220 on the server 1200. The server 1200 may also include one or more power supplies 1260, one or more wired or wireless network interfaces 1250, one or more input and output interfaces 1240, and / or one or more operating systems 1221, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

[0285] The input / output interface 1240 may be used to receive or send data via a network. The specific example of the network may include a wireless network provided by a communication provider of the server 1200. In one example, the input / output interface 1240 includes a network adapter (Network Interface Controller, NIC), which may be connected to other network devices via a base station so as to communicate with the Internet. In one example, the input / output interface 1240 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0286] It can be understood by those skilled in the art that Fig.12 The structure shown is only for illustration and does not limit the structure of the above electronic device. Fig.12 More or fewer components as shown, or with Fig.12 Different configurations shown.

[0287] It can be seen from the embodiments of the purge control method, device, equipment or storage medium of the fuel cell system provided by the present application that the present application responds to the shutdown instruction, controls the working mode of the fuel cell system to the shutdown purge mode; in the shutdown purge mode, obtains the current temperature of the stack in the fuel cell system; when the current temperature of the stack meets the preset conditions, switches the working mode of the fuel cell system to the stack heating mode; in the stack heating mode, controls the cooling subsystem in the fuel cell system to operate in a preset circulation mode; in the preset circulation mode, the coolant in the fuel cell system circulates in the water channel inside the fuel cell system; controls the fan in the fuel cell system to operate at a first preset speed; the fan is used to cool the coolant to obtain the cooled coolant; the cooled coolant is used to cool the stack when the stack purge is completed. The present application quickly heats the stack in a low temperature environment, thereby improving the stack purge efficiency; and through fan control, the coolant in the radiator is quickly cooled, and a large cycle is started after the stack purge is completed. At this time, the coolant temperature in the radiator is low, which can cool the temperature in the cathode and anode cavities, thereby condensing and precipitating the gaseous water in the gas and discharging it from the system. It effectively avoids the residual liquid water in the battery system and the risk of residual liquid water piercing the proton exchange membrane or damaging the catalyst layer; and improves the probability of successful startup of the battery system.

[0288] It should be noted that the above sequence of the embodiments of this specification is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0289] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0290] A person skilled in the art will appreciate that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0291] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A purge control method for a fuel cell system, characterized in that: The method comprises: In response to the shutdown instruction, controlling the operation mode of the fuel cell system to be a shutdown purge mode; In the shutdown purge mode, obtaining a current temperature of a fuel cell stack in the fuel cell system; When the current temperature of the fuel cell stack meets a preset condition, switching the working mode of the fuel cell system to a fuel cell stack heating mode; In the stack heating mode, the cooling subsystem in the fuel cell system is controlled to operate in a preset circulation mode; in the preset circulation mode, the coolant in the fuel cell system circulates in the water channel inside the fuel cell system; The fan in the fuel cell system is controlled to run at a first preset speed; the fan is used to cool the coolant to obtain the cooled coolant; the cooled coolant is used to cool the stack when the stack purge is completed.

2. The method according to claim 1, characterized in that After switching the working mode of the fuel cell system to the stack heating mode, the method further includes: Determining a heating time and an output power of the battery stack according to a current temperature of the battery stack; Determining a target charging energy according to the heating time and the output power; When the target charging energy is less than or equal to the charging energy threshold corresponding to the fuel cell system, determining the operating parameters of the stack heating process; the operating parameters include the operating parameters of the cooling subsystem and the preset speed of the fan; In the stack heating mode, controlling the cooling subsystem in the fuel cell system to operate in a preset circulation mode includes: In the stack heating mode, the cooling subsystem in the fuel cell system is controlled to operate in a preset circulation mode based on the operating parameters of the cooling subsystem.

3. The method according to claim 2, characterized in that In the stack heating mode, the method further includes: Determining the load current and heating amount of the battery stack according to the current temperature of the battery stack; The fuel cell system further includes an anode pressure regulating valve, a hydrogen circulation pump, a solenoid valve, a converter, and a heater. After controlling the fan in the fuel cell system to run at a preset speed, the method further includes: Controlling the anode pressure regulating valve to perform a pressure regulating operation to adjust the anode pressure to a preset pressure value; Controlling the hydrogen circulation pump to perform an anode circulation operation; Controlling the solenoid valve to perform a drainage operation to discharge liquid water generated by the battery stack during operation; Controlling the converter to pull the voltage to the pull current; Based on the heating heat amount, the heater is controlled to perform a heating operation.

4. The method according to claim 3, characterized in that After controlling the heater to perform a heating operation, the method further includes: Obtaining the cumulative heating time of the heater performing the heating operation; When the accumulated heating time is greater than a preset time threshold, the operating mode of the fuel cell system is switched to a stack purge mode.

5. The method according to claim 1, characterized in that The step of obtaining the current temperature of the fuel cell stack in the fuel cell system in the shutdown purge mode includes: In the shutdown purge mode, a preset temperature corresponding to the fuel cell system is obtained; the preset temperature is the ambient temperature corresponding to the fuel cell system or the target temperature of the fuel cell system in a preset period of time in the future; When the preset temperature is less than or equal to a first threshold, the current temperature of the fuel cell stack in the fuel cell system is acquired; the first threshold is a temperature threshold for performing low-temperature shutdown purge.

6. The method according to claim 3, characterized in that: When the current temperature of the fuel cell stack meets a preset condition, switching the working mode of the fuel cell system to the fuel cell stack heating mode includes: Determining a second threshold corresponding to the heating temperature of the fuel cell stack; When the current temperature of the fuel cell stack is less than or equal to the second threshold, it is determined that the current temperature of the fuel cell stack meets the preset condition; and the operating mode of the fuel cell system is switched to a fuel cell stack heating mode.

7. The method according to claim 4, characterized in that After switching the operating mode of the fuel cell system to the stack purge mode, the method further includes: Obtaining a high-frequency impedance value of the battery stack; When the high-frequency impedance value is less than or equal to a preset impedance threshold, the current of the battery stack is adjusted from the pull-load current to the first current; the first current is less than the pull-load current, and the preset impedance threshold is the high-frequency impedance threshold for the battery stack to achieve cold start at the temperature of the first threshold; Controlling the operation of the regulating valve and the air compressor so that the pressure value of the fuel cell stack meets a first pressure threshold; Controlling the fan to run at a second preset speed according to the cooling time or real-time temperature corresponding to the heating module of the fuel cell stack; Controlling the anode pressure regulating valve to perform a pressure regulating operation, and controlling the hydrogen circulation pump to perform an anode circulation operation; The solenoid valve is controlled to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation.

8. The method according to claim 7, characterized in that The method further comprises: When the high-frequency impedance value is greater than a preset impedance threshold, performing a two-cavity purge operation; Controlling the three-way valve of the cooling system in the fuel cell system to close, and controlling the heater of the cooling system in the fuel cell system to open; Controlling the cooling system three-way valve to open, and controlling the cooling system radiator in the fuel cell system to open; Obtaining the accumulated purge time corresponding to the two-chamber purge operations; When the accumulated purge time is less than or equal to a preset time threshold, adjusting the current of the battery stack from the first current to a second current; The solenoid valve is controlled to perform a drainage operation to discharge liquid water generated by the fuel cell stack during operation.

9. A purge control device for a fuel cell system, characterized in that: The device comprises: A first control module, configured to control the operation mode of the fuel cell system to a shutdown purge mode in response to a shutdown instruction; A stack temperature acquisition module, used to acquire the current temperature of the stack in the fuel cell system in the shutdown purge mode; A mode switching module, used to switch the working mode of the fuel cell system to a stack heating mode when the current temperature of the stack meets a preset condition; A second control module is used to control the cooling subsystem in the fuel cell system to operate in a preset circulation mode in the stack heating mode; in the preset circulation mode, the coolant in the fuel cell system circulates in the water channel inside the fuel cell system; The third control module is used to control the fan in the fuel cell system to run at a first preset speed; the fan is used to cool the coolant to obtain the cooled coolant; the cooled coolant is used to cool the stack when the stack purge is completed.

10. A purge control device for a fuel cell system, characterized in that: The device includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to implement the purge control method of the fuel cell system as described in any one of claims 1-8.

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