Stack performance recovery method, device, apparatus, medium and program product

Abstract

The application relates to the technical field of electric piles, in particular to an electric pile performance recovery method, device, equipment, medium and program product, wherein the method comprises the following steps: judging whether a performance recovery instruction is received; if the performance recovery instruction is received, hydrogen supply operation and oxygen supply operation are performed on the electric pile, a load current value is pulled to a first preset current value at a preset rate, and whether the electric pile has an air circulation system is judged; if the electric pile has the air circulation system, the air circulation system is started, the electric pile is controlled to operate at a current value corresponding to the first electric density for a first preset time length, then the anode import and export pressure drop of the electric pile is adjusted to a first preset pressure drop, the air circulation system and an air inlet pile stop valve are closed, constant voltage control is performed when the minimum single cell voltage is equal to a first preset voltage, until the current value of the electric pile is less than a second preset current value, the air outlet pile stop valve is closed and the electric pile is stopped after operating for a second preset time length. Therefore, the problems of performance decline of the fuel electric pile in the long-term operation process are solved, and the service life of the electric pile is increased.

Description

Technical Field

[0001] This application relates to the field of fuel cell stack technology, and in particular to a fuel cell stack performance recovery method, apparatus, equipment, medium and program product. Background Technology

[0002] Currently, fuel cell stack technology is developing rapidly and has been widely applied in the market.

[0003] In related technologies, UI polarization recovery attempts to restore fuel cell performance by adjusting the voltage; high current density operation recovery involves operating the fuel cell at a higher current density to try to improve performance, and needs to be performed separately at specific times.

[0004] However, fuel cell stack performance recovery strategies usually need to be carried out separately after the fuel cell stack is shut down, which takes a long time and affects the efficiency of the fuel cell stack. At the same time, the effect is limited and it is difficult to significantly improve the performance of the fuel cell stack. They need to be run separately at specific times, which is not convenient for the whole vehicle use of the fuel cell stack and increases the complexity of operation. Some recovery strategies require specific operating conditions, such as specific voltage, current or temperature conditions, which limits their application scope and urgently needs to be solved. Summary of the Invention

[0005] This application provides a method, apparatus, equipment, medium, and procedure for restoring the performance of fuel cell stacks, in order to solve problems such as performance degradation of fuel cell stacks during long-term operation and increase the service life of the stacks.

[0006] The first aspect of this application provides a method for restoring the performance of an electric fuel cell stack, comprising the following steps:

[0007] Determine if a performance recovery command has been received;

[0008] If the performance recovery command is received, hydrogen and oxygen supply operations are performed on the fuel cell stack, and the load current value is pulled up to the first preset current value at a preset rate, and it is determined whether the fuel cell stack has an air circulation system.

[0009] If the fuel cell stack has the air circulation system, then the air circulation system is turned on, and the fuel cell stack is controlled to run at the current value corresponding to the first electrical density for a first preset time. Then, the voltage drop at the anode inlet and outlet of the fuel cell stack is adjusted to the first preset voltage drop, and the air circulation system and the air inlet shut-off valve are turned off. Constant voltage control is performed when the lowest single-cell voltage is equal to the first preset voltage until the current value of the fuel cell stack is less than the second preset current value. Then, the air outlet shut-off valve is turned off, and the stack is stopped after running for a second preset time.

[0010] Optionally, after determining whether the fuel cell stack has the air circulation system, the method further includes:

[0011] If the fuel cell stack does not have the air circulation system, then when the highest single-cell voltage is less than or equal to the first preset voltage, the voltage drop at the anode inlet and outlet of the fuel cell stack is adjusted to the first preset voltage drop.

[0012] The air circulation system and the air inlet shut-off valve are closed, and constant voltage control is performed when the lowest unit voltage is equal to the first preset voltage until the current value of the fuel cell stack is less than the second preset current value. Then, the air outlet shut-off valve is closed and the system is shut down after running for the second preset time.

[0013] Optionally, the hydrogen and oxygen supply operations for the fuel cell stack include:

[0014] Based on the hydrogen supply corresponding to the first electrical density, the anode inlet pressure of the fuel cell stack is adjusted to reach a first preset pressure, and the anode inlet and outlet pressure drop of the fuel cell stack is adjusted to a second preset pressure drop;

[0015] Based on a preset air supply amount and a preset duration, oxygen is supplied to the fuel cell stack.

[0016] Optionally, before bringing the load current to the first preset current value at the preset rate, the method further includes:

[0017] Determine whether the lowest single-cell voltage is greater than a second preset voltage, wherein the second preset voltage is greater than the first preset voltage;

[0018] If the minimum single-cell voltage is greater than the second preset voltage, then the load current is drawn up to the first preset current value at the preset rate.

[0019] Optionally, the second preset current value is determined by a second electrical density, wherein the second electrical density is less than the first electrical density.

[0020] A second aspect of this application provides a fuel cell stack performance recovery device, comprising:

[0021] The first judgment module is used to determine whether a performance recovery command has been received.

[0022] The second judgment module is used to perform hydrogen supply and oxygen supply operations on the fuel cell stack when the performance recovery instruction is received, and to pull the load current value to the first preset current value at a preset rate, and to determine whether the fuel cell stack has an air circulation system.

[0023] The control module is configured to, when the air circulation system is present in the fuel cell stack, activate the air circulation system, control the fuel cell stack to run at the current value corresponding to the first electrical density for a first preset time, adjust the anode inlet and outlet voltage drop of the fuel cell stack to the first preset voltage drop, and close the air circulation system and the air inlet shut-off valve. It also performs constant voltage control when the lowest unit voltage is equal to the first preset voltage, until the current value of the fuel cell stack is less than the second preset current value, close the air outlet shut-off valve, and stop the machine after running for a second preset time.

[0024] Optionally, after determining whether the fuel cell stack has the air circulation system, the control module is further configured to:

[0025] If the fuel cell stack does not have the air circulation system, then when the highest single-cell voltage is less than or equal to the first preset voltage, the voltage drop at the anode inlet and outlet of the fuel cell stack is adjusted to the first preset voltage drop.

[0026] The air circulation system and the air inlet shut-off valve are closed, and constant voltage control is performed when the lowest unit voltage is equal to the first preset voltage until the current value of the fuel cell stack is less than the second preset current value. Then, the air outlet shut-off valve is closed and the system is shut down after running for the second preset time.

[0027] Optionally, the second determination module is specifically used for:

[0028] Based on the hydrogen supply corresponding to the first electrical density, the anode inlet pressure of the fuel cell stack is adjusted to reach a first preset pressure, and the anode inlet and outlet pressure drop of the fuel cell stack is adjusted to a second preset pressure drop;

[0029] Based on a preset air supply amount and a preset duration, oxygen is supplied to the fuel cell stack.

[0030] Optionally, before bringing the load current to the first preset current value at the preset rate, the second determination module is further configured to:

[0031] Determine whether the lowest single-cell voltage is greater than a second preset voltage, wherein the second preset voltage is greater than the first preset voltage;

[0032] If the minimum single-cell voltage is greater than the second preset voltage, then the load current is drawn up to the first preset current value at the preset rate.

[0033] Optionally, in the control module, the second preset current value is determined by a second electrical density, wherein the second electrical density is less than the first electrical density.

[0034] A third aspect of this application provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being configured to perform the fuel cell performance recovery method as described in the above embodiments.

[0035] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the fuel cell performance recovery method as described in the above embodiments.

[0036] A fifth aspect of this application provides a computer program product storing a computer program that, when executed by a processor, implements the fuel cell performance recovery method as described in the above embodiments.

[0037] Therefore, upon receiving a performance recovery command, the system initiates hydrogen and oxygen supply operations on the fuel cell stack. The load current is brought up to a first preset current value at a preset rate. If an air circulation system is detected, it is activated. The stack is then controlled to operate at the current value corresponding to the first electrical density for a first preset duration. The anode inlet and outlet voltage drops are adjusted to the first preset voltage drop. The air circulation system and air inlet shut-off valve are then closed. Constant voltage control is maintained when the minimum unit voltage equals the first preset voltage until the stack current value is less than the second preset current value. Finally, the air outlet shut-off valve is closed, and the stack is shut down after operating for a second preset duration. Thus, by reducing the Pt (platinum) catalyst and precisely controlling hydrogen, oxygen, and current load, the system solves the problem of performance degradation in fuel cell stacks during long-term operation, increasing the stack's lifespan.

[0038] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0039] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0040] Figure 1 This is a flowchart of a fuel cell stack performance recovery method according to an embodiment of this application;

[0041] Figure 2 This is a flowchart illustrating a fuel cell stack performance recovery method according to an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of measured data for the operation recovery strategy of a fuel cell stack performance recovery method according to an embodiment of this application;

[0043] Figure 4 This is a schematic diagram of measured performance data after the operation recovery strategy of a fuel cell stack performance recovery method according to an embodiment of this application;

[0044] Figure 5 This is a schematic diagram of a fuel cell performance recovery device provided according to an embodiment of this application;

[0045] Figure 6 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application. Detailed Implementation

[0046] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0047] The following describes a fuel cell stack performance recovery method, apparatus, equipment, medium, and program product according to embodiments of this application with reference to the accompanying drawings. Addressing the performance degradation problem of fuel cell stacks during long-term operation mentioned in the background art, this application provides a fuel cell stack performance recovery method. In this method, upon receiving a performance recovery command, hydrogen and oxygen supply operations are performed on the fuel cell stack. The load current is increased to a first preset current value at a preset rate. Upon determining the presence of an air circulation system in the fuel cell stack, the air circulation system is activated. The fuel cell stack is controlled to operate at the current value corresponding to a first electrical density for a first preset time. The anode inlet and outlet voltage drops are adjusted to a first preset voltage drop. The air circulation system and air inlet shut-off valve are closed. Constant voltage control is performed when the minimum unit voltage equals the first preset voltage until the current value of the fuel cell stack is less than a second preset current value. The air outlet shut-off valve is then closed, and the stack is shut down after operating for a second preset time. Thus, by reducing the Pt (platinum) catalyst and precisely controlling hydrogen supply, oxygen supply, and current load, the performance degradation problem of fuel cell stacks during long-term operation is solved, increasing the fuel cell stack's service life.

[0048] Specifically, Figure 1 This is a schematic flowchart of a fuel cell stack performance recovery method provided in an embodiment of this application.

[0049] like Figure 1 As shown, the method for restoring the performance of the fuel cell stack includes the following steps:

[0050] In step S101, it is determined whether a performance recovery command has been received.

[0051] Among them, the performance recovery command is the trigger signal to start the fuel cell stack performance recovery process.

[0052] Specifically, this application embodiment continuously monitors input signals from the control port or network interface. When this application embodiment receives a signal, it parses the signal to determine whether it is a performance recovery command. These commands may come from the vehicle's central control system, maintenance diagnostic tools, or a recovery program manually triggered by the user. It ensures that the received command is valid and complies with preset safety and operation standards. Once a performance recovery command is detected, this application embodiment will immediately respond and begin executing subsequent operation steps.

[0053] In step S102, if a performance recovery command is received, hydrogen supply and oxygen supply operations are performed on the fuel cell stack, and the load current value is pulled up to the first preset current value at a preset rate, and it is determined whether the fuel cell stack has an air circulation system.

[0054] Here, the preset rate refers to the rate at which the current value increases; the first preset current value refers to a specific current value that is reached after receiving a performance recovery command, as the stack load current gradually increases according to the preset rate until it reaches this value. This current value typically corresponds to the current level at which the stack can operate stably and begin the performance recovery process. The preset rate and the first preset current value can be preset by the user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations; no specific limitations are imposed here.

[0055] Specifically, upon receiving a performance recovery command, this embodiment needs to confirm and verify that the received command is valid and applicable to the current fuel cell stack. Then, the hydrogen supply system is activated to provide hydrogen to the anode of the stack. Based on the current state and performance requirements of the stack, the hydrogen supply and anode inlet pressure are adjusted to meet the stack's performance recovery needs. Simultaneously, the oxygen supply system is activated to provide oxygen to the cathode of the stack; the oxygen supply and pressure also need to be adjusted according to the stack's recovery requirements. The current value of the stack is gradually increased at a preset rate until a first preset current value is reached. This step may require controlling relevant parameters in the Fuel Cell Management System (FCMS), such as output voltage and temperature, to ensure that the increase in current does not damage the stack or affect the recovery effect. The current is then pulled up to the first preset current value, which is typically determined based on the stack design, current state, and performance recovery goals. During the performance recovery operation, this embodiment also needs to confirm whether the stack is equipped with an effective air circulation system. An air circulation system typically includes components such as a fan, heat exchanger, and humidity controller to ensure that the airflow quality, temperature, and humidity on the cathode side (i.e., the air side) are maintained within a suitable range. Its existence and normal operation can be determined by checking the data from relevant sensors (such as temperature, humidity, and flow rate) or by directly observing the operating status of the air circulation system.

[0056] Understandably, upon receiving a clear performance recovery instruction, the fuel cell stack maintenance process is immediately initiated; ensuring a stable supply of hydrogen and oxygen to meet the basic requirements of the electrochemical reaction; and closely monitoring the process of gradually increasing the load current to a first preset current value at a preset rate to ensure safe and effective recovery of the stack performance. Simultaneously, this embodiment also requires verification and confirmation of the normal operation of the air circulation system, as this is crucial for maintaining suitable conditions for the cathode-side gas. Throughout the recovery process, various operating parameters of the stack are continuously monitored, and necessary adjustments are made according to the actual situation.

[0057] Optionally, in some embodiments, hydrogen supply and oxygen supply operations are performed on the fuel cell stack, including: adjusting the anode inlet pressure of the fuel cell stack to a first preset pressure based on the hydrogen supply corresponding to the first electrical density, and adjusting the anode inlet and outlet pressure drop of the fuel cell stack to a second preset pressure drop; and performing oxygen supply operations on the fuel cell stack based on a preset air supply and a preset duration.

[0058] The first preset pressure refers to the hydrogen pressure at the anode inlet of the fuel cell stack during hydrogen supply operation. The second preset pressure drop refers to the pressure difference between the anode inlet and outlet of the fuel cell stack during hydrogen supply operation. Both the first preset pressure and the second preset pressure drop can be preset by the user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations; no specific limitations are imposed here.

[0059] Understandably, key steps in the performance recovery and regulation of a fuel cell stack include adjusting the anode inlet pressure to a first preset pressure and controlling the anode inlet and outlet pressure drops to a second preset pressure drop, as well as supplying oxygen to the stack according to preset air supply volume and duration. These measures aim to ensure the smooth progress of the electrochemical reaction, improve hydrogen utilization by optimizing hydrogen and oxygen supply conditions, and simultaneously promote the stability of the internal environment of the stack. This series of measures not only improves the performance and stability of the stack but also extends its service life, providing a strong guarantee for the efficient and stable operation of the fuel cell system.

[0060] In step S103, if the fuel cell stack has an air circulation system, the air circulation system is turned on, and the fuel cell stack is controlled to run for a first preset time according to the current value corresponding to the first electrical density. Then, the voltage drop at the anode inlet and outlet of the fuel cell stack is adjusted to the first preset voltage drop, and the air circulation system and the air inlet shut-off valve are turned off. Constant voltage control is performed when the lowest single-cell voltage is equal to the first preset voltage until the current value of the fuel cell stack is less than the second preset current value. Then, the air outlet shut-off valve is turned off, and the stack is stopped after running for a second preset time.

[0061] Here, the first electrical density refers to the current density value used by the fuel cell stack during performance recovery. The first preset duration refers to the length of time the fuel cell stack operates at the current value corresponding to the first electrical density. The first preset voltage drop refers to the pressure difference between the inlet and outlet of the fuel cell anode. The first preset voltage refers to a set value of the individual cell voltage of the fuel cell stack during performance recovery; when the lowest individual cell voltage equals this set value, this embodiment switches to constant voltage control mode to ensure that the fuel cell stack continues to operate under a stable voltage until the current value drops below the second preset current value. The second preset current value refers to a specific value to which the fuel cell stack current decreases during performance recovery; when the current value of the fuel cell stack is lower than this set value, it indicates that the performance recovery process is nearing completion, and shutdown preparation can begin; this current value is determined by the second electrical density, and the second electrical density is less than the first electrical density. The second preset duration refers to the period of time the fuel cell stack continues to operate after the air outlet shut-off valve is closed; during this period, the fuel cell stack gradually enters the shutdown state to ensure a smooth transition of all operations and avoid potential damage to the fuel cell stack from sudden shutdown. The first preset duration, the first preset voltage drop, the first preset voltage, the second preset current value, and the second preset duration can all be preset by the user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations; no specific limitations are made here.

[0062] Specifically, the air circulation system is activated to ensure uniform distribution and efficient utilization of air within the fuel cell stack. The stack operates at a current value based on a first current density for a period of time (i.e., a first preset duration). During this time, the stack operates at a specific current density, which helps the catalyst PtO to be reduced to Pt, thereby restoring performance. After the first preset duration ends, to optimize the flow and distribution of hydrogen within the stack and ensure efficient operation, the pressure difference between the anode inlet and outlet is adjusted to a first preset pressure drop. The air circulation system and the air inlet shut-off valve are shut off, stopping the air supply and preparing for the next stage of operation. The voltage of each individual cell is monitored, and when the lowest individual cell voltage reaches the first preset voltage, constant voltage control is switched. Under constant voltage control, the voltage is kept constant, allowing the stack to continue discharging under stable conditions, further promoting the catalyst reduction process. Constant voltage control continues until the stack current value drops below a second preset current value, at which point the stack performance recovery is essentially complete. The air outlet shut-off valve is closed, stopping the air outflow. The stack continues to operate for a second preset duration to ensure a smooth transition of all operations. Finally, the stack is safely shut down, completing the entire performance recovery process.

[0063] Optionally, in some embodiments, the second preset current value is determined by a second electrical density, wherein the second electrical density is less than the first electrical density.

[0064] The second current density refers to a lower current density value used when the fuel cell stack is operating during the performance recovery process.

[0065] Understandably, during the recovery process, the current and voltage status of the fuel cell stack are monitored in real time, and the current value is dynamically adjusted as needed to ensure that it is maintained below the second preset current value; the control system is used to ensure that the current output is automatically adjusted when the second electrical density is reached.

[0066] Therefore, upon receiving a performance recovery command, the fuel cell stack is subjected to hydrogen and oxygen supply operations. The load current is brought up to the first preset current value at a preset rate. After determining that the fuel cell stack has an air circulation system, the air circulation system is activated. The fuel cell stack is controlled to run at the current value corresponding to the first electrical density for a first preset time. Then, the anode inlet and outlet voltage drop of the fuel cell stack is adjusted to the first preset voltage drop. The air circulation system and the air inlet shut-off valve are closed. Constant voltage control is performed when the minimum unit voltage is equal to the first preset voltage until the current value of the fuel cell stack is less than the second preset current value. The air outlet shut-off valve is closed, and the stack is shut down after running for a second preset time. By reducing the Pt (platinum) catalyst, the hydrogen supply, oxygen supply, and current load are precisely controlled, which solves the problem of performance degradation of fuel cell stacks during long-term operation and increases the service life of the fuel cell stack.

[0067] Optionally, in some embodiments, after determining whether the fuel cell stack has an air circulation system, the method further includes: if the fuel cell stack does not have an air circulation system, adjusting the anode inlet and outlet voltage drop of the fuel cell stack to the first preset voltage drop when the highest single-cell voltage is less than or equal to the first preset voltage; closing the air circulation system and the air inlet shut-off valve, and performing constant voltage control when the lowest single-cell voltage is equal to the first preset voltage until the current value of the fuel cell stack is less than the second preset current value, closing the air outlet shut-off valve, and stopping the machine after running for a second preset time.

[0068] The highest single-cell voltage refers to the voltage of the single cell (or cell unit) with the highest voltage among all cells in the fuel cell stack. The lowest single-cell voltage refers to the voltage of the single cell (or cell unit) with the lowest voltage among all cells in the fuel cell stack.

[0069] Understandably, for fuel cell stacks without an air circulation system, during shutdown maintenance, when the highest single-cell voltage is less than or equal to a first preset voltage, this embodiment will adjust the anode inlet and outlet voltages of the stack to the first preset voltage drop; shut down the air circulation system and the air inlet shut-off valve; when the lowest single-cell voltage is equal to the first preset voltage, this embodiment will perform constant voltage control to maintain the stack at a stable voltage level until the current value is less than a second preset current value; shut down the air outlet shut-off valve; after the above conditions are met, the stack will continue to run for a second preset duration, and then shut down to complete the performance recovery process.

[0070] Therefore, by optimizing the shutdown process, even without an air circulation system, the performance of the fuel cell stack can be effectively restored, its service life extended, and overall efficiency improved.

[0071] Optionally, in some embodiments, before drawing the load current value to the first preset current value at a preset rate, the method further includes: determining whether the lowest single-cell voltage is greater than a second preset voltage, wherein the second preset voltage is greater than the first preset voltage; if the lowest single-cell voltage is greater than the second preset voltage, then drawing the load current value to the first preset current value at a preset rate.

[0072] Understandably, before starting to draw the load current to the first preset current value, the lowest individual cell voltage in the fuel cell stack is first determined; a first preset voltage and a second preset voltage are set, wherein the second preset voltage is higher than the first preset voltage; the lowest individual cell voltage and the second preset voltage are compared to determine whether the conditions for starting to draw the load current are met; if the lowest individual cell voltage is greater than the second preset voltage, it indicates that the fuel cell stack is in good condition and it is safe to start drawing the load current to the first preset current value; after confirming that the voltage conditions are met, the load current is drawn to the first preset current value at a preset rate.

[0073] Therefore, the judgment mechanism effectively prevents the risk of directly bearing high load current due to insufficient voltage of individual cells, and protects the individual cells from damage; only when the voltage of all individual cells is kept within a safe range will the current load be gradually increased to the target value at a preset rate, thereby maximizing energy utilization efficiency and performance.

[0074] The fuel cell performance recovery method is described in detail below with reference to a specific embodiment of this application.

[0075] Specifically, such as Figure 2 As shown, the fuel cell stack performance recovery method includes the following steps:

[0076] S201: Issue recovery command.

[0077] S202: Open the hydrogen venting valve for x seconds (0 < x < 5) to release excess nitrogen and increase the hydrogen concentration.

[0078] S203: Reference fuel cell stack with an electrical density of 0.1–0.2 A / cm 2 The hydrogen supply setting ensures that the pressure drop between the inlet and outlet quickly reaches the set values ​​P_An_in (which can be 1-1.5 bara) and dp_An (which can be 40-80 bara) after hydrogen supply. This step ensures that all valves, flow meters, sensors, etc. in the hydrogen circuit are working properly, proving that the hydrogen supply is normal.

[0079] S204: Determine whether the anode inlet pressure has reached the set values ​​P_An in and dp_An; if yes, proceed to step S205; otherwise, return to step S203.

[0080] S205: Set the air flow controller to a range of 10 to 30 liters per minute, and start recording the time after setting the flow rate; this step is to ensure that all valves, flow meters, sensors, etc. in the air circuit are working properly, proving that the air can be supplied normally.

[0081] S206: Determine whether the minimum single-cell voltage U_min is greater than the voltage judgment value 1 (this value is set between 700 and 850mV to avoid high open-circuit potential accelerating the degradation of the stack performance); if yes, proceed to step S207; otherwise, return to step S205.

[0082] S207: Slowly increase the load current to the current setting value 1 (this value is set between 0.1 and 0.2 A / cm). 2 Electrical density corresponds to the current, which corresponds to the vehicle's idling current.

[0083] S208: Determine whether the air supply timer t_air_feed has reached the set value; if yes, proceed to step S209; otherwise, return to step S205.

[0084] S209: Stop air supply after 10 seconds.

[0085] S210: Determine if there is an air circulation system; if yes, proceed to step S211; otherwise, return to step S221.

[0086] S211: Turn on air circulation.

[0087] S212: Determine if the load has reached 0.1~0.2 A / cm. 2 If the current runs for y seconds, the electrical density corresponds to the current; if yes, proceed to step S213; otherwise, return to step S211.

[0088] S213: Reduce the speed of the hydrogen circulation pump.

[0089] S214: Determine whether the hydrogen circulation pump speed dp_An (this value can be between 20-40mbara) is greater than or equal to the set value 2; if yes, proceed to step S215; otherwise, return to step S213.

[0090] S215: Shut down the air circulation and close the air inlet shut-off valve.

[0091] S216: Determine whether the lowest single-cell voltage U_min is less than or equal to the voltage judgment value 2 (this value is set between 100 and 200mV).

[0092] S217: When the lowest single-cell voltage U_min equals the voltage judgment value 2, switch to constant voltage control and oxygen-consuming discharge.

[0093] S218: Determine if the current is less than 0.004 A / cm 2 If the electronic password is correct, proceed to step S219; otherwise, return to step S217.

[0094] S219: Close the air discharge shut-off valve.

[0095] S220: Run for z seconds after unloading, then proceed to step S229.

[0096] S221: Determine whether the highest single-cell voltage U_max is less than or equal to the voltage judgment value 2 (this value is set between 100 and 200mV); if yes, proceed to step S222.

[0097] S222: Reduce the speed of the hydrogen circulation pump.

[0098] S223: Determine whether the hydrogen circulation pump speed dp_An (this value can be between 20-40mbara) is greater than or equal to the set value 2; if yes, proceed to step S224; otherwise, return to step S222.

[0099] S224: Shut down the air circulation and close the air inlet shut-off valve.

[0100] S225: When the minimum single-cell voltage U_min equals the voltage judgment value 2, switch to constant voltage control and oxygen-consuming discharge.

[0101] S226: Determine if the current is less than 0.004 A / cm 2 If the electronic password is correct, proceed to step S227; otherwise, return to step S226.

[0102] S227: Shut down the air circulation and close the air outlet shut-off valve.

[0103] S228: Run for z seconds after unloading.

[0104] S229: End shutdown.

[0105] Therefore, upon receiving a performance recovery command, the system initiates hydrogen and oxygen supply operations on the fuel cell stack. The load current is brought up to a first preset current value at a preset rate. If an air circulation system is detected, it is activated. The stack is then controlled to operate at the current value corresponding to the first electrical density for a first preset duration. The anode inlet and outlet voltage drops are adjusted to the first preset voltage drop. The air circulation system and air inlet shut-off valve are then closed. Constant voltage control is maintained when the minimum unit voltage equals the first preset voltage until the stack current value is less than the second preset current value. Finally, the air outlet shut-off valve is closed, and the stack is shut down after operating for a second preset duration. Thus, by reducing the Pt (platinum) catalyst and precisely controlling hydrogen, oxygen, and current load, the system solves the problem of performance degradation in fuel cell stacks during long-term operation, increasing the stack's lifespan.

[0106] Furthermore, such as Figure 3 and Figure 4 As shown, Figure 3 This is a schematic diagram of measured data for the operation recovery strategy of a fuel cell stack performance recovery method according to a specific embodiment of this application. Figure 4 This is a schematic diagram of the actual performance data after the operation recovery strategy of one embodiment of this application.

[0107] Depend on Figure 3 and Figure 4 The experimental results show that after implementing the operation recovery strategy with an air recirculation device, the performance of the fuel cell stack under high voltage density was significantly improved, recovering approximately 30mV. This result indicates that the air recirculation device and the corresponding operation recovery strategy have a positive effect on improving and optimizing the performance of the fuel cell stack.

[0108] According to the fuel cell stack performance recovery method proposed in this application, after receiving a performance recovery command, hydrogen and oxygen supply operations are performed on the fuel cell stack. The load current value is brought up to a first preset current value at a preset rate. After determining that an air circulation system exists in the fuel cell stack, the air circulation system is activated. The fuel cell stack is controlled to run at the current value corresponding to the first electrical density for a first preset time. Then, the anode inlet and outlet voltage drop of the fuel cell stack is adjusted to the first preset voltage drop. The air circulation system and the air inlet shut-off valve are closed. Constant voltage control is performed when the minimum unit voltage is equal to the first preset voltage until the current value of the fuel cell stack is less than the second preset current value. Finally, the air outlet shut-off valve is closed, and the stack is shut down after running for a second preset time. Thus, by reducing the Pt (platinum) catalyst and precisely controlling the hydrogen supply, oxygen supply, and current load, the performance degradation problem of fuel cell stacks during long-term operation is solved, and the lifespan of the fuel cell stack is increased.

[0109] Next, the fuel cell performance recovery device according to the embodiments of this application is described with reference to the accompanying drawings.

[0110] Figure 5 This is a block diagram of a fuel cell performance recovery device according to an embodiment of this application.

[0111] like Figure 5 As shown, the fuel cell stack performance recovery device 10 includes: a first judgment module 100, a second judgment module 200, and a control module 300.

[0112] The first judgment module 100 is used to determine whether a performance recovery instruction has been received.

[0113] The second judgment module 200 is used to perform hydrogen supply and oxygen supply operations on the fuel cell stack when a performance recovery command is received, and pull the load current value to the first preset current value at a preset rate, and determine whether the fuel cell stack has an air circulation system.

[0114] The control module 300 is used to, when the fuel cell stack has an air circulation system, turn on the air circulation system, control the fuel cell stack to run at the current value corresponding to the first electrical density for a first preset time, adjust the anode inlet and outlet voltage drop of the fuel cell stack to the first preset voltage drop, and turn off the air circulation system and the air inlet shut-off valve. It also performs constant voltage control when the lowest single-cell voltage is equal to the first preset voltage, until the current value of the fuel cell stack is less than the second preset current value, then closes the air outlet shut-off valve and stops the machine after running for the second preset time.

[0115] Optionally, after determining whether the fuel cell stack has an air circulation system, the control module 300 is further configured to: if the fuel cell stack does not have an air circulation system, adjust the anode inlet and outlet voltage drop of the fuel cell stack to the first preset voltage drop when the highest individual cell voltage is less than or equal to the first preset voltage; close the air circulation system and the air inlet shut-off valve, and perform constant voltage control when the lowest individual cell voltage is equal to the first preset voltage, until the current value of the fuel cell stack is less than the second preset current value, close the air outlet shut-off valve and run for a second preset time before stopping the machine.

[0116] Optionally, the second judgment module 200 is specifically used to: adjust the anode inlet pressure of the fuel cell stack to a first preset pressure based on the hydrogen supply corresponding to the first electrical density, and adjust the anode inlet and outlet pressure drop of the fuel cell stack to a second preset pressure drop; and perform oxygen supply operation for the fuel cell stack based on the preset air supply and preset duration.

[0117] Optionally, before the load current value is brought up to the first preset current value at a preset rate, the second judgment module 200 is further configured to: determine whether the lowest single-cell voltage is greater than the second preset voltage, wherein the second preset voltage is greater than the first preset voltage; if the lowest single-cell voltage is greater than the second preset voltage, then the load current value is brought up to the first preset current value at a preset rate.

[0118] Optionally, in the control module 300, the second preset current value is determined by the second electrical density, wherein the second electrical density is less than the first electrical density.

[0119] It should be noted that the foregoing explanation of the embodiment of the fuel cell stack performance recovery method also applies to the fuel cell stack performance recovery device of this embodiment, and will not be repeated here.

[0120] According to the fuel cell stack performance recovery device proposed in this application embodiment, after receiving a performance recovery command, the device performs hydrogen and oxygen supply operations on the fuel cell stack, loads the current value to a first preset current value at a preset rate, and, upon determining that an air circulation system exists in the fuel cell stack, activates the air circulation system. The device then controls the fuel cell stack to run at the current value corresponding to the first electrical density for a first preset time, adjusts the anode inlet and outlet voltage drop of the fuel cell stack to the first preset voltage drop, closes the air circulation system and the air inlet shut-off valve, and performs constant voltage control when the minimum unit voltage equals the first preset voltage until the current value of the fuel cell stack is less than a second preset current value. Finally, the device closes the air outlet shut-off valve and runs for a second preset time before shutting down. Thus, by reducing the Pt (platinum) catalyst and precisely controlling hydrogen supply, oxygen supply, and current load, the device solves the problem of performance degradation in fuel cell stacks during long-term operation, increasing the fuel cell stack's service life.

[0121] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include:

[0122] The memory 601, the processor 602, and the computer program stored on the memory 601 and capable of running on the processor 602.

[0123] When the processor 602 executes the program, it implements the fuel cell performance recovery method provided in the above embodiments.

[0124] Furthermore, electronic devices also include:

[0125] Communication interface 603 is used for communication between memory 601 and processor 602.

[0126] The memory 601 is used to store computer programs that can run on the processor 602.

[0127] The memory 601 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0128] If the memory 601, processor 602, and communication interface 603 are implemented independently, then the communication interface 603, memory 601, and processor 602 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0129] Optionally, in a specific implementation, if the memory 601, processor 602, and communication interface 603 are integrated on a single chip, then the memory 601, processor 602, and communication interface 603 can communicate with each other through an internal interface.

[0130] The processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0131] This embodiment also provides a computer-readable storage medium storing a computer program thereon, characterized in that the program, when executed by a processor, implements the above-described method for restoring the performance of the fuel cell stack.

[0132] This invention also provides a computer program product, which stores a computer program that, when executed by a processor, implements the above-described fuel cell performance recovery method.

[0133] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0134] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0135] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0136] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0137] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

Claims

1. A method of regaining performance of a stack, characterized by, The method comprises the following steps: determining whether a performance recovery instruction is received; if the performance recovery instruction is received, hydrogen supply and oxygen supply are performed on the stack, and a load current value is pulled to a first preset current value at a preset rate, and it is determined whether the stack has an air circulation system; if the stack has the air circulation system, the air circulation system is started, and the stack is controlled to operate at a current value corresponding to a first current density for a first preset time period, then the anode inlet and outlet pressure drop of the stack is adjusted to a first preset pressure drop, the air circulation system and an air inlet stack stop valve are closed, constant voltage control is performed when the minimum single cell voltage is equal to a first preset voltage, until the current value of the stack is less than a second preset current value, the air outlet stack stop valve is closed and the stack is stopped after operating for a second preset time period; after determining whether the stack has the air circulation system, if the stack does not have the air circulation system, the anode inlet and outlet pressure drop of the stack is adjusted to the first preset pressure drop when the maximum single cell voltage is less than or equal to the first preset voltage; the air circulation system and the air inlet stack stop valve are closed, and constant voltage control is performed when the minimum single cell voltage is equal to the first preset voltage, until the current value of the stack is less than the second preset current value, the air outlet stack stop valve is closed and the stack is stopped after operating for the second preset time period.

2. The method of claim 1, wherein, The hydrogen supply and oxygen supply performed on the stack comprise: based on a hydrogen supply amount corresponding to the first current density, the anode inlet pressure of the stack is adjusted to a first preset pressure, and the anode inlet and outlet pressure drop of the stack is adjusted to a second preset pressure drop; based on a preset air supply amount and a preset time period, oxygen supply is performed on the stack.

3. The method of claim 1, wherein, Before the load current value is pulled to the first preset current value at the preset rate, the following steps are further included: determining whether the minimum single cell voltage is greater than a second preset voltage, wherein the second preset voltage is greater than the first preset voltage; if the minimum single cell voltage is greater than the second preset voltage, the load current value is pulled to the first preset current value at the preset rate.

4. The method of claim 1, wherein, The second preset current value is determined by a second current density, wherein the second current density is less than the first current density.

5. A stack performance recovery apparatus characterized by comprising: The method comprises the following steps: a first determination module for determining whether a performance recovery instruction is received; a second determination module for, when the performance recovery instruction is received, performing hydrogen supply and oxygen supply on the stack, pulling a load current value to a first preset current value at a preset rate, and determining whether the stack has an air circulation system; a control module for, when the stack has the air circulation system, starting the air circulation system, and controlling the stack to operate at a current value corresponding to a first current density for a first preset time period, then adjusting the anode inlet and outlet pressure drop of the stack to a first preset pressure drop, closing the air circulation system and an air inlet stack stop valve, and performing constant voltage control when the minimum single cell voltage is equal to a first preset voltage, until the current value of the stack is less than a second preset current value, closing the air outlet stack stop valve and stopping the stack after operating for a second preset time period. After judging whether the air circulation system exists in the stack, the control module is further configured to, if the air circulation system does not exist in the stack, adjust the anode inlet and outlet pressure drop of the stack to the first preset pressure drop when the highest single cell voltage is less than or equal to the first preset voltage. The air circulation system and the air inlet stack stop valve are closed, constant voltage control is performed when the lowest single cell voltage is equal to the first preset voltage, until the current value of the stack is less than the second preset current value, the air outlet stack stop valve is closed and the second preset time is run before shutdown.

6. An electronic device, comprising: Comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the stack performance recovery method of any one of claims 1-4.

7. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the stack performance recovery method of any one of claims 1-4.

8. A computer program product storing a computer program, characterized in that, The program is executed by the processor to implement the stack performance recovery method of any one of claims 1-4.

Images