Voltage control method of fuel cell and related equipment

Abstract

The invention discloses a voltage control method of a fuel cell and related equipment, relates to the field of fuel cells, and mainly aims to solve the problems that the voltage consistency is reduced and the active recovery capability of voltage deviation is insufficient when the fuel cell runs at an idle speed. The method comprises the steps that the target demand power of a fuel cell of the vehicle is obtained, and the target demand power is used for representing the current power demand of the vehicle; the single battery voltage deviation of the battery stack of the vehicle is obtained, and the single battery voltage deviation is used for representing the voltage consistency between different single batteries in the battery stack; and executing a purging strategy based on the target demand power and the single cell voltage deviation, the purging strategy being used for purging the interior of a stack of the fuel cell by controlling gas flow. The method is used for the voltage control process of the fuel cell.

Description

Technical Field

[0001] This invention relates to the field of fuel cells, and more particularly to a voltage control method and related equipment for fuel cells. Background Technology

[0002] Proton exchange membrane fuel cells (PEMFCs) are highly efficient and clean energy conversion devices with significant application value in the transportation sector. During operation, hydrogen and air are continuously supplied to the anode and cathode of the fuel cell stack, respectively, to maintain power generation. To improve hydrogen utilization efficiency and coordinate with the power battery for energy management, fuel cell systems often need to operate at idle speed for extended periods. During this process, the chemical reaction of hydrogen and oxygen to produce water, along with the permeation and accumulation of nitrogen from the cathode to the anode, can easily lead to the formation of nitrogen and liquid water impurities in certain individual cells within the fuel cell stack. This causes a decrease in the concentration of reacting gases in certain areas, resulting in a reduction in the output voltage of that cell and ultimately deteriorating the overall voltage consistency of the fuel cell stack.

[0003] Existing methods lack real-time monitoring and dynamic adjustment mechanisms for single-chip voltage deviation, and cannot actively implement recovery operations when voltage consistency declines, thus revealing shortcomings such as low response efficiency and insufficient active recovery capability of voltage deviation. Summary of the Invention

[0004] In view of the above problems, the present invention provides a voltage control method and related equipment for fuel cells, the main purpose of which is to solve the problem of insufficient active recovery capability of voltage deviation when the voltage consistency of fuel cells decreases during idling.

[0005] To address at least one of the aforementioned technical problems, in a first aspect, the present invention provides a voltage control method for a fuel cell, the method comprising: Obtain the target power demand of the vehicle's fuel cell, wherein the target power demand is used to represent the vehicle's current power demand; The voltage deviation of individual cells in the battery stack of a vehicle is obtained, wherein the voltage deviation of individual cells is used to characterize the voltage consistency between different individual cells in the battery stack. A purging strategy is executed based on the target power requirement and the voltage deviation of the single cell, wherein the purging strategy is used to purge the interior of the fuel cell stack by controlling gas flow.

[0006] Optionally, obtaining the target power demand of the vehicle's fuel cell includes: Obtain the target power requirement sent by the vehicle controller to the fuel cell system; The vehicle's idling status is determined based on the target power requirement.

[0007] Optionally, obtaining the voltage deviation of a single cell in the vehicle's battery stack includes: Obtain the voltage of all individual cells in the vehicle's battery stack; The average and minimum values ​​are determined based on the voltages of all individual cells. The voltage deviation of a single battery cell is determined based on the difference between the average and the minimum values.

[0008] Optionally, the step of executing the purge strategy based on the target power demand and the single-cell voltage deviation includes: When the target power requirement is zero, the voltage deviation of the single battery cell is obtained; If the voltage deviation of a single cell is less than the lower limit of the voltage deviation range, the purging strategy is not executed. If the voltage deviation of a single cell is greater than or equal to the lower limit of the voltage deviation range and less than or equal to the upper limit of the voltage deviation range, the first purging strategy is executed. If the voltage deviation of a single cell exceeds the upper limit of the voltage deviation range, a second purging strategy is executed.

[0009] Optional, The purging metering ratio of the second purging strategy is greater than that of the first purging strategy. The purging time of the second purging strategy is shorter than the purging time of the first purging strategy. The purging metering ratio is used to control the airflow rate when the purging strategy is executed.

[0010] Optionally, the method further includes: Once the purging strategy has been completed, the purging metering ratio is restored to the initial metering ratio. The number of times the purging strategy is executed is counted.

[0011] Optionally, the method further includes: If the number of times the purging strategy is executed exceeds the upper limit of the number of purging times, the vehicle exits the idling state.

[0012] Secondly, embodiments of the present invention also provide a voltage control device for a fuel cell, comprising: The first acquisition unit is used to acquire the target power demand of the vehicle's fuel cell, wherein the target power demand is used to represent the current power demand of the vehicle. The second acquisition unit is used to acquire the voltage deviation of a single cell in the battery stack of the vehicle, wherein the voltage deviation of a single cell is used to characterize the voltage consistency between different single cells in the battery stack. An execution unit is configured to execute a purging strategy based on the target power demand and the voltage deviation of the single cell, wherein the purging strategy is used to purge the interior of the fuel cell stack by controlling gas flow.

[0013] To achieve the above objectives, according to a third aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium comprising a stored program, wherein, when the program is executed by a processor, the steps of the above-described voltage control method for a fuel cell are implemented.

[0014] To achieve the above objectives, according to a fourth aspect of the present invention, an electronic device is provided, comprising at least one processor and at least one memory connected to the processor; wherein the processor is configured to invoke program instructions in the memory to execute the steps of the voltage control method for the fuel cell described above.

[0015] By employing the above technical solution, the fuel cell voltage control method and related equipment provided by this invention address the problem of insufficient active recovery capability for voltage deviation caused by voltage inconsistency degradation during fuel cell idling. This invention obtains the target power demand of the vehicle's fuel cell, where the target power demand represents the vehicle's current power demand; obtains the voltage deviation of individual cells in the vehicle's fuel cell stack, where the individual cell voltage deviation characterizes the voltage consistency between different individual cells in the fuel cell stack; and executes a purging strategy based on the target power demand and the individual cell voltage deviation, where the purging strategy controls gas flow to purge the interior of the fuel cell stack. In this solution, the target power demand of the vehicle's fuel cell is first obtained, which directly indicates the vehicle's current power demand state, thereby identifying the specific operating condition to be addressed; the individual cell voltage deviation of the fuel cell stack is obtained in real time, and this deviation objectively characterizes the degree of voltage inconsistency deterioration. Increased deviation reveals insufficient reactant gas concentration due to local impurity accumulation. Based on these two parameters, the system executes a purging strategy, using hydrodynamics to purge nitrogen and liquid water impurities accumulated inside the fuel cell stack, thereby restoring the local reactive gas concentration and reducing voltage inconsistency. Driven by real-time data, it directly intervenes in the causes of voltage deviation at idle speed, reducing response delay and enhancing the system's self-regulation capability.

[0016] Accordingly, the voltage control device, equipment, and computer-readable storage medium for fuel cells provided in the embodiments of the present invention also have the above-mentioned technical effects.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic flowchart of a voltage control method for a fuel cell provided in an embodiment of the present invention is shown; Figure 2 A schematic block diagram of a voltage control device for a fuel cell provided in an embodiment of the present invention is shown; Figure 3 A schematic block diagram of a voltage control electronic device for a fuel cell provided in an embodiment of the present invention is shown. Detailed Implementation

[0019] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0020] To address the issue of insufficient active voltage deviation recovery capability during fuel cell idling due to decreased voltage consistency, embodiments of the present invention provide a fuel cell voltage control method, such as... Figure 1 As shown, the method includes: S101. Obtain the target power requirement of the vehicle's fuel cell, wherein the target power requirement is used to represent the current power requirement of the vehicle. In one embodiment, obtaining the target power demand of the vehicle's fuel cell includes: Obtain the target power requirement sent by the vehicle controller to the fuel cell system; The vehicle's idling status is determined based on the target power requirement.

[0021] For example, the target power demand refers to the power value sent to the fuel cell system in real time by the vehicle controller, which directly reflects the current power demand state of the vehicle. For example, when the power value is zero, it means that the vehicle is in the idling condition with minimum power output; the idling state refers to the minimum power operation mode maintained by the fuel cell system when the target power demand is zero.

[0022] This application achieves precise identification and locking of operating conditions by integrating external control signals. It acquires the target power demand sent by the vehicle controller and uses real-time power data provided by the vehicle controller as input to ensure that the fuel cell system can accurately perceive changes in the vehicle's power demand, thereby avoiding misjudgments caused by relying on internal estimations or delayed signals. Based on this power value, it determines the idling state by introducing a binary condition triggering mechanism. That is, when the target power demand is zero, it automatically determines that the system has entered the idling state. This judgment logic is simple and direct, reducing the processing overhead caused by complex calculations, and can quickly lock the specific operating condition of idling, laying the foundation for subsequent voltage deviation processing.

[0023] By using the above technical solution, the overall power demand of the vehicle is decoupled from the local control of the fuel cell. The internal decision-making is driven by external signals, ensuring that the purging strategy is activated only under idling conditions. This avoids ineffective intervention when not idling, reduces response delay, and improves the targeting of control. The entire process is seamlessly connected to subsequent operations through real-time data, which enhances the adaptability to dynamic operating conditions.

[0024] S102. Obtain the voltage deviation of a single cell in the battery stack of the vehicle, wherein the voltage deviation of a single cell is used to characterize the voltage consistency between different single cells in the battery stack. In one embodiment, obtaining the individual cell voltage deviation of the vehicle's battery stack includes: Obtain the voltage of all individual cells in the vehicle's battery stack; The average and minimum values ​​are determined based on the voltages of all individual cells. The voltage deviation of a single battery cell is determined based on the difference between the average and the minimum values.

[0025] For example, the "all cell voltages" refers to the set of real-time voltage values ​​of each cell in the fuel cell stack. These values ​​directly reflect the power generation status and health of each cell. The average value is the arithmetic mean calculated based on the voltages of all cells, used to represent the overall voltage level of the stack. The minimum value is the lowest value among all cell voltages, used to identify the cell with the worst performance or the most serious problem. The cell voltage deviation is the difference between the average value and the minimum value, used to quantify the degree of deterioration in the stack voltage consistency. An increased deviation value indicates local problems such as impurity accumulation leading to insufficient reactant gas concentration, thereby causing voltage inconsistency.

[0026] This application achieves objective monitoring and quantification of voltage consistency through real-time data acquisition and simple calculations. It acquires the voltage of all individual cells, continuously collecting voltage signals from each cell using built-in voltage sensors or monitoring circuits to ensure comprehensive and real-time data, providing a foundation for subsequent analysis. Based on all voltages, it determines the average and minimum values ​​using basic statistical methods. The average reflects the overall performance trend, while the minimum exposes weaknesses. This comparison efficiently identifies local anomalies without relying on complex models. Based on the difference, it determines the deviation, directly characterizing the degree of inconsistency using scalar differences. The underlying logic is that an increase in deviation is positively correlated with a decrease in the concentration of reactive gases caused by the accumulation of local impurities (such as nitrogen and liquid water), thus providing a clear intervention trigger signal. The entire process embodies the closed-loop concept of simple monitoring and conditional triggering. By calculating deviation values ​​in real time, it can dynamically sense voltage changes, reduce response delays, and provide a basis for decision-making regarding subsequent purging strategies, enhancing the ability to perceive the internal state of the fuel cell stack.

[0027] S103. Execute a purging strategy based on the target power requirement and the voltage deviation of the single cell, wherein the purging strategy is used to purge the interior of the fuel cell stack by controlling gas flow.

[0028] In one embodiment, the purge strategy based on the target power demand and the single-cell voltage deviation includes: When the target power requirement is zero, the voltage deviation of the single battery cell is obtained; If the voltage deviation of a single cell is less than the lower limit of the voltage deviation range, the purging strategy is not executed. If the voltage deviation of a single cell is greater than or equal to the lower limit of the voltage deviation range and less than or equal to the upper limit of the voltage deviation range, the first purging strategy is executed. If the voltage deviation of a single cell exceeds the upper limit of the voltage deviation range, a second purging strategy is executed.

[0029] For example, the target power demand refers to the power value sent to the fuel cell system by the vehicle controller, which directly reflects the current power demand state of the vehicle. When the power is zero, it indicates that the vehicle is in an idling operation condition. The single cell voltage deviation is a quantitative index obtained by calculating the difference between the average and minimum values ​​of the voltages of all single cells in the stack. It is used to characterize the degree of deterioration of voltage consistency. An increase in the deviation value indicates that there may be local impurity accumulation leading to insufficient reactant gas concentration. The lower limit and upper limit of the voltage deviation range are preset thresholds used to classify the severity level of the deviation. The lower limit represents the warning starting point of the deviation, and the upper limit represents the critical point of the deviation. The first purging strategy and the second purging strategy are purging methods for different deviation levels. The second purging strategy has a higher purging intensity but a shorter duration than the first purging strategy to adapt to voltage inconsistency problems of different severity.

[0030] This application achieves dynamic adjustment and risk optimization of the purging strategy through a conditional grading mechanism. When the target power demand is zero, the voltage deviation of a single cell is obtained using the idling state as a trigger condition, ensuring that the purging operation is only activated during idle periods, avoiding interference with non-idling conditions. Based on a comparison of the deviation value with a preset range, multi-level judgment logic is introduced. When the deviation is less than the lower limit, it indicates good voltage consistency, and purging is unnecessary to reduce unnecessary intervention losses. When the deviation is between the upper and lower limits, the first purging strategy is executed, using gentle purging to mildly remove locally accumulated nitrogen and liquid water, gradually restoring the concentration of reactant gases. When the deviation exceeds the upper limit, the second purging strategy is executed, which uses a stronger purging force to quickly address severe voltage inconsistencies, but balances the risk of membrane dryness by shortening the purging time.

[0031] By employing the above technical solutions, through real-time monitoring and graded response, it is ensured that purging operations are only performed when necessary, and that the intensity matches the severity of the problem, thereby reducing response delays and improving self-regulation capabilities, while avoiding the negative impacts of over-purging.

[0032] In one embodiment, The purging metering ratio of the second purging strategy is greater than that of the first purging strategy. The purging time of the second purging strategy is shorter than the purging time of the first purging strategy. The purging metering ratio is used to control the airflow rate when the purging strategy is executed.

[0033] For example, the purging metering ratio refers to the factor by which the cathode metering ratio is increased in the purging strategy, that is, the factor by which the ratio of airflow to the minimum gas flow required for power generation is increased. It is used to control the intensity of airflow during purging. The purging metering ratio of the first purging strategy corresponds to the factor for light purging, which aims to gently remove impurities inside the fuel cell stack. The purging metering ratio of the second purging strategy corresponds to the factor for heavy purging, which aims to more forcefully remove accumulated substances. The purging time refers to the duration of the purging strategy execution, which is used to control the length of the purging operation. Specifically, the purging time of the first purging strategy is the duration of light purging, allowing for a longer period of gentle intervention, while the purging time of the second purging strategy is the duration of heavy purging, limiting a shorter period of intense operation.

[0034] This application achieves a balanced optimization of purging effect and risk control by inversely adjusting the purging force and time. The second purging strategy has a higher purging metering ratio than the first purging strategy. It responds in stages based on the severity of voltage deviation. When the deviation is large, such as exceeding the upper limit of the voltage deviation range, the accumulation of impurities inside the stack is more severe, requiring a stronger airflow impact to quickly improve the local reactive gas concentration, thereby more effectively reducing voltage inconsistency. The second purging strategy has a shorter purging time than the first purging strategy, avoiding the risk of membrane dryness caused by over-purging. Although a higher metering ratio can improve purging efficiency, it can also exacerbate the potential threat of proton exchange membrane dehydration. By shortening the duration, rapid cleaning can be achieved while limiting the accumulation of dehydration effects, ensuring stack reliability.

[0035] By employing the above technical solution and adjusting the negative correlation between the metering ratio and time, when dealing with voltage deviations of varying severity, it can not only enhance the purging intensity in a targeted manner but also reduce side effects through time constraints, thereby optimizing overall operational stability while maintaining voltage consistency.

[0036] In one embodiment, the method further includes: Once the purging strategy has been completed, the purging metering ratio is restored to the initial metering ratio. The number of times the purging strategy is executed is counted.

[0037] For example, the completion of the purging strategy means that the purging operation is completed according to the preset purging time, that is, the purging action ends after the predetermined duration is reached; the initial metering ratio is the normal cathode metering ratio maintained by the fuel cell system under idling conditions before purging, that is, the standard ratio of air flow to the minimum gas flow required for power generation; the execution count refers to the cumulative number of times the purging strategy is triggered, which is used to record the historical frequency of the purging operation.

[0038] This application restores the metering ratio to the initial metering ratio. The purging strategy, as a temporary intervention measure, aims to increase the airflow by briefly increasing the cathode metering ratio, thereby purging nitrogen and liquid water impurities accumulated inside the fuel cell stack. However, after purging, it is necessary to promptly return to normal operating conditions to avoid increasing the risk of proton exchange membrane dehydration due to prolonged high flow. This restoration mechanism ensures a rapid return to idle reference conditions after cleaning, reducing unnecessary energy consumption and reliability impacts. The number of purging strategy executions is recorded, and the cumulative number of purging events provides operational history data. This recording behavior itself does not directly participate in decision-making, but it lays the foundation for subsequent monitoring of purging frequency. If the number of executions is too high, it can indirectly reflect the severity or persistence of voltage consistency issues, thus providing data support for potential risk control, such as limiting purging or adjusting operating modes.

[0039] In one embodiment, the method further includes: When the maximum number of purging operations is reached within the maximum number of purging operations allowed by the purging strategy, the vehicle exits the idling state.

[0040] For example, the number of times the purging strategy is executed refers to the cumulative number of times the purging operation is performed. This number increases by one after each purging is completed, and is used to record the historical frequency of purging intervention. The maximum number of purging attempts limit is a preset upper limit threshold for the number of purging operations, which is used to limit the maximum number of times the purging strategy can be executed to prevent excessive intervention.

[0041] This application achieves protective control through a cycle monitoring and forced exit mechanism. When the number of times the purging strategy is executed exceeds the maximum purging cycle limit, the vehicle exits the idling state. This is based on the idea of ​​cumulative risk management: the purging strategy improves voltage consistency by increasing the cathode metering ratio, but each purging increases the potential risk of proton exchange membrane dehydration. As the number of executions accumulates, this risk gradually increases. By setting a cycle limit and forcibly exiting the idling state when this limit is exceeded, the continuous operating conditions that may lead to membrane dryness are actively interrupted, and a safer operating mode is entered, thereby reducing the possibility of stack damage.

[0042] By using the above scheme, state transitions are triggered by a threshold number of times, ensuring that long-term reliability is not sacrificed while pursuing improved voltage consistency, thus achieving a balance between operational safety and functionality.

[0043] In summary, the first step is to obtain the target power demand of the vehicle's fuel cell. This power directly indicates the vehicle's current power demand state and is used to accurately determine whether the fuel cell system is idling, i.e., the target power demand is zero, thus identifying the specific operating condition that needs to be addressed. The second step is to obtain the real-time voltage deviation of each cell in the fuel cell stack. This deviation is calculated by subtracting the minimum voltage from the average voltage of all cells in the stack, objectively representing the degree of voltage inconsistency deterioration. Increased deviation reveals insufficient reactant gas concentration due to local impurity accumulation. Based on these two parameters, a purging strategy is implemented, introducing condition-triggered active intervention: when idling is confirmed and the voltage deviation exceeds a preset threshold, a light or heavy purging is automatically selected based on the deviation range. This involves briefly increasing the cathode metering ratio to boost airflow, using hydrodynamics to purge accumulated nitrogen and liquid water impurities inside the stack, thereby restoring local reactant gas concentration and reducing voltage inconsistency. The purging strategy also includes risk control logic, balancing purging effectiveness with membrane dryness risk by limiting the number of purgings and differentiating purging times, ensuring timely response without sacrificing reliability. By using real-time data to drive decision-making, the system directly intervenes in the causes of voltage deviations at idle speed, reducing response delays and enhancing self-regulation capabilities.

[0044] Furthermore, as a response to the above Figure 1 In addition to the implementation of the method shown, this embodiment of the invention also provides a voltage control device for a fuel cell, used for controlling the voltage of the aforementioned fuel cell. Figure 1 The method shown is implemented accordingly. This device embodiment corresponds to the foregoing method embodiment. For ease of reading, this device embodiment will not repeat the details of the foregoing method embodiment, but it should be clear that the device in this embodiment can implement all the contents of the foregoing method embodiment. Figure 2 As shown, the device includes: a first acquisition unit 21, a second acquisition unit 22, and an execution unit 23, wherein... The first acquisition unit 21 is used to acquire the target power demand of the vehicle's fuel cell, wherein the target power demand is used to represent the current power demand of the vehicle. The second acquisition unit 22 is used to acquire the voltage deviation of a single cell in the battery stack of the vehicle, wherein the voltage deviation of a single cell is used to characterize the voltage consistency between different single cells in the battery stack. The execution unit 23 is used to execute a purging strategy based on the target power demand and the voltage deviation of the single cell, wherein the purging strategy is used to purge the interior of the fuel cell stack by controlling the gas flow.

[0045] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can implement a voltage control method for fuel cells. This method can address the problem of voltage inconsistency degradation and insufficient active recovery capability for voltage deviations during fuel cell idling.

[0046] This invention provides a computer-readable storage medium including a stored program that, when executed by a processor, implements a voltage control method for a fuel cell.

[0047] This invention provides a processor for running a program, wherein the program executes a voltage control method for a fuel cell.

[0048] This invention provides an electronic device, which includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the voltage control method for a fuel cell as described above. This invention provides an electronic device 30, such as... Figure 3 As shown, the electronic device includes at least one processor 301, and at least one memory 302 and bus 303 connected to the processor; wherein, the processor 301 and the memory 302 communicate with each other through the bus 303; the processor 301 is used to call program instructions in the memory to execute the above-mentioned voltage control method for the fuel cell.

[0049] The smart electronic devices mentioned in this article can be PCs, tablets, mobile phones, etc.

[0050] This application also provides a computer program product that, when executed on a process management electronic device, is suitable for executing a program that initializes the voltage control method steps of the aforementioned fuel cell.

[0051] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0052] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0053] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0054] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0055] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0056] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to perform actions such as... Figure 1 The control flow of the memory in the corresponding embodiment.

[0057] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0058] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0059] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0060] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0061] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0062] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0063] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A voltage control method for a fuel cell, characterized in that, include: Obtain the target power demand of the vehicle's fuel cell, wherein the target power demand is used to represent the vehicle's current power demand; The voltage deviation of individual cells in the battery stack of a vehicle is obtained, wherein the voltage deviation of individual cells is used to characterize the voltage consistency between different individual cells in the battery stack. A purging strategy is executed based on the target power requirement and the voltage deviation of the single cell, wherein the purging strategy is used to purge the interior of the fuel cell stack by controlling gas flow.

2. The method according to claim 1, characterized in that, The process of obtaining the target power requirement of the vehicle's fuel cell includes: Obtain the target power requirement sent by the vehicle controller to the fuel cell system; The vehicle's idling status is determined based on the target power requirement.

3. The method according to claim 1, characterized in that, The acquisition of the individual cell voltage deviation of the vehicle's battery stack includes: Obtain the voltage of all individual cells in the vehicle's battery stack; The average and minimum values ​​are determined based on the voltages of all individual cells. The voltage deviation of a single battery cell is determined based on the difference between the average and the minimum values.

4. The method according to claim 1, characterized in that, The purge strategy based on the target power requirement and the single-cell voltage deviation includes: When the target power requirement is zero, the voltage deviation of the single battery cell is obtained; If the voltage deviation of a single cell is less than the lower limit of the voltage deviation range, the purging strategy is not executed. If the voltage deviation of a single cell is greater than or equal to the lower limit of the voltage deviation range and less than or equal to the upper limit of the voltage deviation range, the first purging strategy is executed. If the voltage deviation of a single cell exceeds the upper limit of the voltage deviation range, a second purging strategy is executed.

5. The method according to claim 4, characterized in that, The purging metering ratio of the second purging strategy is greater than that of the first purging strategy. The purging time of the second purging strategy is shorter than the purging time of the first purging strategy. The purging metering ratio is used to control the airflow rate when the purging strategy is executed.

6. The method according to claim 1, characterized in that, Also includes: Once the purging strategy has been completed, the purging metering ratio is restored to the initial metering ratio. The number of times the purging strategy is executed is counted.

7. The method according to claim 6, characterized in that, Also includes: If the number of times the purging strategy is executed exceeds the upper limit of the number of purging times, the vehicle exits the idling state.

8. A voltage control device for a fuel cell, characterized in that, Also includes: The first acquisition unit is used to acquire the target power demand of the vehicle's fuel cell, wherein the target power demand is used to represent the current power demand of the vehicle. The second acquisition unit is used to acquire the voltage deviation of a single cell in the battery stack of the vehicle, wherein the voltage deviation of a single cell is used to characterize the voltage consistency between different single cells in the battery stack. An execution unit is configured to execute a purging strategy based on the target power demand and the voltage deviation of the single cell, wherein the purging strategy is used to purge the interior of the fuel cell stack by controlling gas flow.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed by a processor, it implements the steps of the voltage control method for a fuel cell as described in any one of claims 1 to 7.

10. An electronic device, characterized in that, The electronic device includes at least one processor and at least one memory connected to the processor; wherein the processor is configured to invoke program instructions in the memory to execute the steps of the voltage control method for a fuel cell as described in any one of claims 1 to 7.

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