Electric pile performance recovery method, device, equipment, medium and program product

Abstract

The invention relates to the technical field of galvanic piles, in particular to a galvanic pile performance recovery method, device and equipment, a medium and a program product, and the method comprises the following steps: judging whether a performance recovery instruction is received or not; if yes, hydrogen supply operation and oxygen supply operation are carried out on the electric pile, the current value is loaded to a first preset current value according to a preset rate, and whether the electric pile has an air circulation system or not is judged; if yes, an air circulation system is started, after the electric pile is controlled to operate for a first preset duration according to the current value corresponding to the first current density, the anode inlet and outlet voltage drop of the electric pile is adjusted to a first preset voltage drop, the air circulation system and an air inlet pile stop valve are closed, and constant voltage control is carried out when the lowest monomer voltage is equal to the first preset voltage; and when the current value of the electric pile is smaller than a second preset current value, closing the air pile-out stop valve, operating for a second preset duration, and then stopping. Therefore, the problem that the performance of the fuel stack is reduced in the long-term operation process is solved, and the service life of the stack is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery stack technology, and in particular to a battery stack performance recovery method, device, equipment, medium and program product. Background Art

[0002] At present, fuel cell stack technology is developing rapidly and has been widely used in the market.

[0003] In the related art, UI polarization (U-IPolarization) recovery attempts to restore the performance of the fuel cell stack by adjusting the voltage; high-current operation recovery is to operate the fuel cell stack at a higher current density in an attempt to improve performance, which needs to be performed separately during a specific period of time.

[0004] However, the performance recovery strategy of the fuel cell stack usually needs to be carried out separately after the fuel cell stack is shut down, which is time-consuming 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. It needs to be operated separately during a specific period of time, which is not convenient for the use of the fuel cell stack as a whole vehicle and increases the complexity of operation. Some recovery strategies require specific operating conditions, such as specific voltage, current or temperature conditions, which limits their scope of application and needs to be urgently resolved. Summary of the invention

[0005] The present application provides a method, device, equipment, medium and program product for restoring the performance of a fuel cell stack to solve problems such as performance degradation of a fuel cell stack during long-term operation and to increase the service life of the stack.

[0006] The first embodiment of the present application provides a method for restoring battery stack performance, comprising the following steps:

[0007] Determining whether a performance recovery instruction is received;

[0008] If the performance recovery instruction is received, hydrogen supply operation and oxygen supply operation are performed on the fuel cell stack, and the current value is pulled to a 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, the air circulation system is turned on, and the fuel cell stack is controlled to operate for a first preset time according to the current value corresponding to the first electrical density, and then the anode inlet and outlet pressure drop of the fuel cell stack is adjusted to the first preset pressure drop, and the air circulation system and the air inlet shut-off valve are closed. When the minimum cell voltage is equal to the first preset voltage, constant pressure control is performed until the current value of the fuel cell stack is less than the second preset current value, and then the air outlet shut-off valve is closed and the stack is shut down after operating 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, when the highest cell voltage is less than or equal to the first preset voltage, adjusting the anode inlet and outlet pressure drop of the fuel cell stack 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 minimum 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, and the air outlet shut-off valve is closed and the stack is shut down after running for the second preset time.

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

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

[0015] Based on a preset air supply amount and a preset time, oxygen supply operation is performed for the fuel cell stack.

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

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

[0018] If the lowest cell voltage is greater than the second preset voltage, the current value starts to be pulled 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 smaller than the first electrical density.

[0020] A second aspect of the present application provides a battery stack performance recovery device, including:

[0021] A first determination module, used to determine whether a performance recovery instruction is received;

[0022] a second judgment module, configured to, upon receiving the performance recovery instruction, perform hydrogen supply operation and oxygen supply operation on the fuel cell stack, load the current value to a first preset current value at a preset rate, and judge whether the fuel cell stack has an air circulation system;

[0023] A control module is used to start the air circulation system when the air circulation system exists in the fuel cell stack, and control the fuel cell stack to operate for a first preset time according to the current value corresponding to the first electrical density, then adjust the anode inlet and outlet pressure drop of the fuel cell stack to the first preset pressure drop, and close the air circulation system and the air inlet shut-off valve, and perform constant pressure control when the minimum cell voltage is equal to the first preset voltage, until the current value of the fuel cell stack is less than a second preset current value, close the air outlet shut-off valve and run for a second preset time before shutting down.

[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, when the highest cell voltage is less than or equal to the first preset voltage, adjusting the anode inlet and outlet pressure drop of the fuel cell stack 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 minimum 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, and the air outlet shut-off valve is closed and the stack is shut down after running for the second preset time.

[0027] Optionally, the second judgment module is specifically used to:

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

[0029] Based on a preset air supply amount and a preset time, oxygen supply operation is performed for the fuel cell stack.

[0030] Optionally, before the current value is pulled to the first preset current value at the preset rate, the second judgment module is further used to:

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

[0032] If the lowest cell voltage is greater than the second preset voltage, the current value starts to be pulled 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 smaller than the first electrical density.

[0034] The third aspect of the present application provides an electronic device, comprising: 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, and the instructions are configured to execute the battery stack performance recovery method as described in the above embodiment.

[0035] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the method for restoring the performance of a battery stack as described in the above embodiment.

[0036] A fifth aspect of the present application provides a computer program product, which stores a computer program that, when executed by a processor, implements the battery stack performance recovery method as described in the above embodiment.

[0037] Therefore, after it is determined that the performance recovery instruction has been received, the fuel cell stack is operated to supply hydrogen and oxygen, and the current value is pulled to the first preset current value at a preset rate. After it is determined that 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 the first preset time according to the current value corresponding to the first electric density, and the anode inlet and outlet pressure drop of the fuel cell stack is adjusted to the first preset pressure drop, and the air circulation system and the air inlet cut-off valve are closed, and constant pressure control is performed when the minimum 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, and the air outlet cut-off valve is closed and the fuel cell stack is shut down after running for the second preset time. Therefore, by reducing the Pt (platinum) catalyst, accurately controlling the hydrogen supply, oxygen supply and current pulling, the problem of performance degradation of the fuel cell stack during long-term operation is solved, and the service life of the fuel cell stack is increased.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0040] Figure 1 A flowchart of a method for restoring battery stack performance provided according to an embodiment of the present application;

[0041] Figure 2 A flowchart of a method for restoring battery stack performance provided according to an embodiment of the present application;

[0042] Figure 3 A schematic diagram of measured data of an operation recovery strategy of a battery stack performance recovery method provided according to an embodiment of the present application;

[0043] Figure 4 A schematic diagram of measured performance data after an operation recovery strategy of a method for recovering performance of a battery stack provided according to an embodiment of the present application;

[0044] Figure 5 A schematic diagram of a battery stack performance recovery device provided according to an embodiment of the present application;

[0045] Figure 6 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

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

[0047] The following describes the method, device, equipment, medium and program product of the stack performance recovery of the embodiment of the present application with reference to the accompanying drawings. In view of the problem of performance degradation of the fuel cell stack mentioned in the above background technology during long-term operation, the present application provides a method for restoring the performance of the stack, in which after judging that the performance recovery instruction is received, the stack is operated with hydrogen and oxygen, and the current value is pulled to the first preset current value at a preset rate, and after judging that the stack has an air circulation system, the air circulation system is turned on, and the stack is controlled to run for a first preset time according to the current value corresponding to the first electric density, and the anode inlet and outlet pressure drop of the stack is adjusted to the first preset pressure drop, the air circulation system and the air inlet stop valve are closed, and constant pressure control is performed when the minimum 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 stop valve is closed and the stack is shut down after running for the second preset time. Thus, by reducing the Pt (platinum) catalyst, accurately controlling the hydrogen supply, oxygen supply and current loading, the problem of performance degradation of the fuel cell stack during long-term operation is solved, and the service life of the stack is increased.

[0048] Specifically, Figure 1 A schematic flow chart of a method for restoring battery stack performance provided in an embodiment of the present application.

[0049] like Figure 1 As shown, the battery stack performance recovery method includes the following steps:

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

[0051] Among them, the performance recovery instruction is a trigger signal for starting the fuel cell stack performance recovery process.

[0052] Specifically, the embodiment of the present application continuously monitors input signals from the control port or network interface. When the embodiment of the present application receives a signal, it parses the signal to determine whether it is a performance recovery instruction. These instructions may come from the vehicle's central control embodiment of the present application, maintenance diagnostic tools, or recovery programs manually triggered by the user to ensure that the received instructions are valid and meet the preset safety and operating standards; once a performance recovery instruction is detected, the embodiment of the present application will immediately respond and begin executing subsequent operating steps.

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

[0054] The preset rate refers to the speed at which the current value increases; the first preset current value refers to a specific current value reached by gradually increasing the stack load current at the preset rate after receiving the performance recovery instruction, which usually corresponds to the current level at which the stack can operate stably and start 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, and are not specifically limited here.

[0055] Specifically, if a performance recovery instruction is received, the embodiment of the present application needs to confirm and verify that the received performance recovery instruction is valid and for the current fuel cell stack, and then start the hydrogen supply system to provide hydrogen to the anode of the stack; according to the current state and performance requirements of the stack, adjust the hydrogen supply and anode inlet pressure to meet the needs of the stack to recover performance. At the same time, start the oxygen supply system to provide oxygen to the cathode of the stack; the oxygen supply and pressure also need to be adjusted according to the recovery requirements of the stack. The current value of the stack is gradually increased at a preset rate until the first preset current value is reached; this step may require controlling the relevant parameters in the fuel cell management system (FCMS), such as output voltage, temperature, etc., to ensure that the increase in current does not damage the stack or affect the recovery effect; pull the current to the first preset current value, which is usually determined based on the stack design, current state and performance recovery target. When performing the performance recovery operation, the embodiment of the present application also needs to confirm whether the stack is equipped with an effective air circulation system. The air circulation system usually includes components such as fans, heat exchangers, and humidity controllers, which are used to ensure that the air flow quality, temperature, and humidity on the cathode side (i.e., the air side) are maintained within an appropriate range; by checking the data of relevant sensors (such as temperature, humidity, flow, etc.) or directly observing the operating status of the air circulation system, it can be determined whether it exists and is working normally.

[0056] It is understandable that after receiving a clear performance recovery instruction, the maintenance process of the fuel cell stack is immediately started; a stable supply of hydrogen and oxygen is ensured to meet the basic needs of the electrochemical reaction; the process of gradually increasing the load current to the first preset current value at a preset rate needs to be closely monitored to ensure safe and effective recovery of the stack performance; at the same time, the embodiment of the present application also needs to verify and confirm the normal operation of the air circulation system, because this is crucial to maintaining suitable conditions for the cathode side gas. During the entire recovery process, the various operating parameters of the stack are continuously monitored, and necessary adjustments are made according to actual conditions.

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

[0058] The first preset pressure refers to the hydrogen pressure value at the anode inlet of the stack during the hydrogen supply operation. The second preset pressure drop refers to the pressure difference between the anode inlet and outlet of the stack during the hydrogen supply operation. Both the first preset pressure and the second preset pressure drop can be preset by the user, and can be obtained through a limited number of experiments or a limited number of computer simulations, and are not specifically limited here.

[0059] It is understandable that in the performance recovery and adjustment process of the fuel cell stack, the key steps include adjusting the anode inlet pressure to the first preset pressure and controlling the anode inlet and outlet pressure drop to the second preset pressure drop, and supplying oxygen to the stack according to the preset air supply volume and duration, aiming to ensure the smooth progress of the electrochemical reaction, improve the hydrogen utilization rate by optimizing the supply conditions of hydrogen and oxygen, and 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 at a current value corresponding to the first electrical density, then the anode inlet and outlet pressure drops of the fuel cell stack are adjusted to the first preset pressure drop, and the air circulation system and the air inlet shut-off valve are closed. When the minimum cell voltage is equal to the first preset voltage, constant pressure control is performed until the current value of the fuel cell stack is less than the second preset current value, and then the air outlet shut-off valve is closed and the stack is shut down after running for a second preset time.

[0061] Among them, the first electric density refers to the current density value used when the stack is working during the performance recovery process. The first preset duration refers to the length of time that the stack runs according to the current value corresponding to the first electric density. The first preset voltage drop refers to the pressure difference between the inlet and outlet of the anode of the stack. The first preset voltage refers to a set value of the voltage of the single cell of the stack during the performance recovery process; when the lowest single cell voltage is equal to this set value, the embodiment of the present application will switch to the constant voltage control mode to ensure that the stack continues to operate at 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 stack current is reduced during the performance recovery process. When the current value of the stack is lower than this set value, it indicates that the performance recovery process is nearly completed, and the shutdown preparation can be started at this time; the current value is determined by the second electric density, and the second electric density is less than the first electric density. The second preset duration refers to the period of time that the stack continues to operate after the air outlet shut-off valve is closed; during this period of time, the stack gradually enters the shutdown state to ensure a smooth transition of all operations and avoid damage to the stack caused by 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, can be obtained through a limited number of experiments, or can be obtained through a limited number of computer simulations, and are not specifically limited here.

[0062] Specifically, the air circulation system is started to ensure uniform distribution and effective utilization of air in the fuel cell stack; the fuel cell stack will operate for a period of time (i.e., a first preset time) at a current value based on the first electrical density. During this period of time, the fuel cell stack operates at a specific current density, which helps the catalyst PtO to be reduced to Pt, thereby restoring performance; after the first preset time, in order to optimize the flow and distribution of hydrogen inside the fuel cell stack and ensure that the fuel cell stack can operate efficiently, the pressure difference between the anode inlet and outlet is adjusted to the first preset pressure drop; the air circulation system and the air inlet shut-off valve are closed, the air supply is stopped, and preparations are made for the next stage of operation; the voltage of each single cell is monitored, and when it is detected that the lowest single cell voltage reaches the first preset voltage, it is switched to constant voltage control; under constant voltage control, the voltage is kept constant so that the fuel cell stack continues to discharge under stable conditions, further promoting the reduction process of the catalyst; constant voltage control is continued until the current value of the fuel cell stack drops below the second preset current value, at which time, the performance recovery of the fuel cell stack is basically completed; the air outlet shut-off valve is closed to stop the outflow of air; the fuel cell stack continues to operate for a second preset time to ensure a smooth transition of all operations; finally, it is safely shut down to complete 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 smaller than the first electrical density.

[0064] Among them, the second current density refers to a lower current density value used when the battery stack is working during the performance recovery process.

[0065] It can be understood that during the recovery process, the current and voltage states of the battery 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 under the condition of reaching the second electrical density.

[0066] Therefore, after receiving the performance recovery instruction, hydrogen supply and oxygen supply operations are performed on the fuel cell stack, and the current value is pulled to a first preset current value at a preset rate. After it is determined that there is an air circulation system in the fuel cell stack, the air circulation system is turned on, and the fuel cell stack is controlled to run for a first preset time at a current value corresponding to the first electrical density. Then, the anode inlet and outlet pressure drops of the fuel cell stack are adjusted to the first preset pressure drop, the air circulation system and the air inlet shut-off valve are closed, and constant voltage control is performed when the minimum 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, and 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 loading are precisely controlled, which solves the problem of performance degradation of the fuel cell stack 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, it also includes: if the fuel cell stack does not have an air circulation system, then when the highest cell voltage is less than or equal to the first preset voltage, adjusting the anode inlet and outlet pressure drop of the fuel cell stack to a first preset voltage; closing the air circulation system and the air inlet shut-off valve, and performing constant pressure control when the lowest cell voltage is equal to the first preset voltage, until the current value of the fuel cell stack is less than a second preset current value, closing the air outlet shut-off valve and running for a second preset time before shutting down.

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

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

[0070] Therefore, by optimizing the shutdown process, the performance of the fuel cell stack can be effectively restored, its service life can be extended, and the overall efficiency can be improved even if the stack does not have an air circulation system.

[0071] Optionally, in some embodiments, before pulling the current value to the first preset current value at a preset rate, it also 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 starting to pull the current value to the first preset current value at a preset rate.

[0072] It can be understood that before starting to load current to the first preset current value, first determine the lowest cell voltage in the battery stack; set the first preset voltage and the second preset voltage, where the second preset voltage is higher than the first preset voltage; compare the lowest cell voltage with the second preset voltage to determine whether the conditions for starting to load current are met; if the lowest cell voltage is greater than the second preset voltage, it means that the battery stack is in good condition and can safely start to load current to the first preset current value; after confirming that the voltage condition is met, start to load current 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 single cell voltage, protecting the battery cells from damage; only when all single cell voltages are maintained within a safe range, the embodiment of the present application will gradually increase the current load to the target value at a preset rate, thereby maximizing energy utilization efficiency and performance.

[0074] The following describes in detail the method for restoring the performance of a battery stack in conjunction with a specific embodiment of the present application.

[0075] Specifically, Figure 2 As shown, the battery stack performance recovery method comprises the following steps:

[0076] S201: Issue a recovery instruction.

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

[0078] S203: Reference stack at a current density of 0.1 to 0.2 A / cm 2 The hydrogen supply volume is set to ensure that the pressure drop between the inlet and outlet quickly reaches the set value P_An_in (the value can be 1-1.5 bara) and the set value dp_An (the value can be 40-80 mbara) after the hydrogen is supplied; this step is to ensure that all valves, flow meters, sensors, etc. in the hydrogen circuit are working properly, proving that hydrogen can be supplied normally

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

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

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

[0082] S207: Slowly pull the current to the current setting value 1 (the value is set at 0.1~0.2A / cm 2 The electric density corresponds to the current, corresponding to the vehicle idle current)

[0083] S208: Determine whether the air supply timer t_air_feed reaches 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 whether 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 whether the load is 0.1-0.2A / cm 2 The electric density corresponds to the current running for y seconds; if yes, go 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 (the value can be 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: Turn off the air circulation and close the air inlet stop valve.

[0091] S216: Determine whether the minimum cell voltage U_min is less than or equal to voltage determination value 2 (this value is set at 100-200 mV).

[0092] S217: When the minimum cell voltage U_min is equal to the voltage judgment value 2, the constant voltage control is switched to oxygen-consuming discharge.

[0093] S218: Determine whether the current is less than 0.004A / cm 2 If yes, go to step S219; otherwise, return to step S217.

[0094] S219: Close the air outflow stop valve.

[0095] S220: Run for z seconds after load reduction, and proceed to step S229.

[0096] S221: Determine whether the maximum cell voltage U_max is less than or equal to voltage judgment value 2 (this value is set at 100-200 mV); 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 (the value can be 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: Turn off the air circulation and close the air inlet stop valve.

[0100] S225: When the minimum cell voltage U_min is equal to the voltage judgment value 2, the control is changed to constant voltage control and oxygen consumption discharge.

[0101] S226: Determine whether the current is less than 0.004A / cm 2 If yes, go to step S227; otherwise, return to step S226.

[0102] S227: Close the air circulation and the air outflow stop valve.

[0103] S228: Run for z seconds after load reduction.

[0104] S229: End shutdown.

[0105] Therefore, after it is determined that the performance recovery instruction has been received, the fuel cell stack is operated to supply hydrogen and oxygen, and the current value is pulled to the first preset current value at a preset rate. After it is determined that 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 the first preset time according to the current value corresponding to the first electric density, and the anode inlet and outlet pressure drop of the fuel cell stack is adjusted to the first preset pressure drop, and the air circulation system and the air inlet cut-off valve are closed, and constant pressure control is performed when the minimum 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, and the air outlet cut-off valve is closed and the fuel cell stack is shut down after running for the second preset time. Therefore, by reducing the Pt (platinum) catalyst, accurately controlling the hydrogen supply, oxygen supply and current pulling, the problem of performance degradation of the fuel cell stack during long-term operation is solved, and the service life of the fuel cell stack is increased.

[0106] Furthermore, if Figure 3 and Figure 4 As shown, Figure 3 This is a schematic diagram of measured data of an operation recovery strategy of a battery stack performance recovery method according to a specific embodiment of the present application. Figure 4 This is a schematic diagram of measured performance data after running the recovery strategy of an embodiment of the present application.

[0107] Depend on Figure 3 and Figure 4 The measured results show that after the operation recovery strategy is implemented under the condition of air circulation device, the performance of the fuel cell stack at high voltage density is significantly improved, about 30mV is recovered. This result shows that the air circulation 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 method for restoring the performance of the battery stack proposed in the embodiment of the present application, after judging that the performance restoration instruction is received, hydrogen supply operation and oxygen supply operation are performed on the battery stack, and the current value is pulled to the first preset current value at a preset rate. After judging that the battery stack has an air circulation system, the air circulation system is turned on, and the battery stack is controlled to run for the first preset time according to the current value corresponding to the first electric density, and the anode inlet and outlet pressure drop of the battery stack is adjusted to the first preset pressure drop, the air circulation system and the air inlet cut-off valve are closed, and constant pressure control is performed when the minimum cell voltage is equal to the first preset voltage, until the current value of the battery stack is less than the second preset current value, the air outlet cut-off valve is closed, and the battery stack is shut down after running for the second preset time. Thus, by reducing the Pt (platinum) catalyst, the hydrogen supply, oxygen supply and current pulling are accurately controlled, and the problem of performance degradation of the fuel cell stack during long-term operation is solved, and the service life of the battery stack is increased.

[0109] Next, the battery stack performance recovery device proposed according to the embodiment of the present application is described with reference to the accompanying drawings.

[0110] Figure 5 It is a block diagram of a battery stack performance recovery device according to an embodiment of the present application.

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

[0112] The first determination module 100 is used to determine whether a performance recovery instruction is received;

[0113] The second judgment module 200 is used to perform hydrogen supply operation and oxygen supply operation on the fuel cell stack when receiving the performance recovery instruction, and pull the current value to a first preset current value at a preset rate, and judge whether the fuel cell stack has an air circulation system;

[0114] The control module 300 is used to start the air circulation system when there is an air circulation system in the fuel cell stack, and control the fuel cell stack to operate for a first preset time according to the current value corresponding to the first electrical density, then adjust the anode inlet and outlet pressure drop of the fuel cell stack to the first preset pressure drop, and close the air circulation system and the air inlet shut-off valve, and perform constant pressure control when the minimum 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 shutting down.

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

[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 supply oxygen to the fuel cell stack based on a preset air supply and a preset time.

[0117] Optionally, before pulling the current value to the first preset current value at a preset rate, the second judgment module 200 is also used to: judge 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 start pulling the current value 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 a second electrical density, wherein the second electrical density is smaller than the first electrical density.

[0119] It should be noted that the aforementioned explanation of the embodiment of the battery stack performance recovery method is also applicable to the battery stack performance recovery device of this embodiment, and will not be repeated here.

[0120] According to the stack performance recovery device proposed in the embodiment of the present application, after it is judged that the performance recovery instruction is received, the stack is operated to supply hydrogen and oxygen, and the current value is pulled to the first preset current value at a preset rate. After it is judged that the stack has an air circulation system, the air circulation system is turned on, and the stack is controlled to run for a first preset time according to the current value corresponding to the first electric density, and the anode inlet and outlet pressure drop of the stack is adjusted to the first preset pressure drop, the air circulation system and the air inlet cut-off valve are closed, and constant pressure control is performed when the minimum 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 cut-off valve is closed, and the stack is shut down after running for the second preset time. Therefore, by reducing the Pt (platinum) catalyst, the hydrogen supply, oxygen supply and current pulling are accurately controlled, the problem of performance degradation of the fuel cell stack during long-term operation is solved, and the service life of the stack is increased.

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

[0122] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0123] When the processor 602 executes the program, the battery stack performance recovery method provided in the above embodiment is implemented.

[0124] Furthermore, the electronic device further comprises:

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

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

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

[0128] If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

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

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

[0131] This embodiment also provides a computer-readable storage medium on which a computer program is stored, characterized in that when the program is executed by a processor, the above-mentioned battery stack performance recovery method is implemented.

[0132] An embodiment of the present invention further provides a computer program product, which stores a computer program, and when the program is executed by a processor, the above-mentioned method for recovering the performance of a battery stack is implemented.

[0133] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

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

[0135] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0136] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0137] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A method for restoring battery stack performance, characterized in that: The following steps are involved: Determining 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 fuel cell stack, and the current value is pulled to a first preset current value at a preset rate, and it is determined whether the fuel cell stack has an air circulation system; If the fuel cell stack has the air circulation system, the air circulation system is turned on, and the fuel cell stack is controlled to operate for a first preset time according to the current value corresponding to the first electrical density, and then the anode inlet and outlet pressure drop of the fuel cell stack is adjusted to the first preset pressure drop, and the air circulation system and the air inlet shut-off valve are closed. When the minimum cell voltage is equal to the first preset voltage, constant pressure control is performed until the current value of the fuel cell stack is less than the second preset current value, and then the air outlet shut-off valve is closed and the stack is shut down after operating for a second preset time.

2. The method according to claim 1, characterized in that After determining whether the battery stack has the air circulation system, the method further includes: If the fuel cell stack does not have the air circulation system, when the highest cell voltage is less than or equal to the first preset voltage, adjusting the anode inlet and outlet pressure drop of the fuel cell stack to the first preset voltage drop; The air circulation system and the air inlet shut-off valve are closed, and constant voltage control is performed when the minimum 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, and the air outlet shut-off valve is closed and the stack is shut down after running for the second preset time.

3. The method according to claim 1, characterized in that The hydrogen supply operation and oxygen supply operation for the fuel cell stack include: Based on the hydrogen supply corresponding to the first electrical density, adjusting the anode inlet pressure of the stack to a first preset pressure, and adjusting the anode inlet and outlet pressure drop of the stack to a second preset pressure drop; Based on a preset air supply amount and a preset time, oxygen supply operation is performed for the fuel cell stack.

4. The method according to claim 1, characterized in that: Before the current value is pulled to the first preset current value at the preset rate, the method further includes: Determining whether the lowest cell voltage is greater than a second preset voltage, wherein the second preset voltage is greater than the first preset voltage; If the lowest cell voltage is greater than the second preset voltage, the current value starts to be pulled to the first preset current value at the preset rate.

5. The method according to claim 1, characterized in that The second preset current value is determined by a second electrical density, wherein the second electrical density is smaller than the first electrical density.

6. A stack performance recovery device, characterized in that: The following steps are involved: A first determination module, used to determine whether a performance recovery instruction is received; a second judgment module, configured to, upon receiving the performance recovery instruction, perform hydrogen supply operation and oxygen supply operation on the fuel cell stack, load the current value to a first preset current value at a preset rate, and judge whether the fuel cell stack has an air circulation system; A control module is used to start the air circulation system when the air circulation system exists in the fuel cell stack, and control the fuel cell stack to operate for a first preset time according to the current value corresponding to the first electrical density, then adjust the anode inlet and outlet pressure drop of the fuel cell stack to the first preset pressure drop, and close the air circulation system and the air inlet shut-off valve, and perform constant pressure control when the minimum cell voltage is equal to the first preset voltage, until the current value of the fuel cell stack is less than a second preset current value, close the air outlet shut-off valve and run for a second preset time before shutting down.

7. The battery stack performance recovery device according to claim 6, characterized in that: After determining whether the fuel cell stack has the air circulation system, the control module is further configured to: If the fuel cell stack does not have the air circulation system, when the highest cell voltage is less than or equal to the first preset voltage, adjusting the anode inlet and outlet pressure drop of the fuel cell stack to the first preset voltage drop; The air circulation system and the air inlet shut-off valve are closed, and constant voltage control is performed when the minimum 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, and the air outlet shut-off valve is closed and the stack is shut down after running for the second preset time.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for recovering the performance of a battery stack as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the battery stack performance recovery method as described in any one of claims 1 to 5.

10. A computer program product, wherein the computer program product stores a computer program, characterized in that: When the program is executed by a processor, the method for recovering the performance of a battery stack as described in any one of claims 1 to 5 is implemented.

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