Method, device and system for controlling voltage fluctuation of single electric pile

Abstract

The invention relates to a method, a device and a system for controlling voltage fluctuation of a single electric pile. The method comprises the following steps: acquiring the voltage of a single battery in the electric pile acquired by a single electric pile voltage inspection unit; and judging whether the voltage exceeds a preset stabilizing range, if so, adjusting working parameters of the fuel cell power generation system, and if not, maintaining the current operation state of the fuel cell power generation system. According to the invention, the data of the electric pile single voltage inspection unit and the feedback value of the single voltage are collected as the input parameters of the control method, so that the working parameters of the system are dynamically adjusted on the premise of ensuring that the fuel cell power generation system meets the power generation requirement; the single voltage fluctuation of the galvanic pile is controlled to be always within the set adjustment range, the risk that the service life of the galvanic pile is shortened due to excessive single voltage fluctuation is effectively inhibited, and the stability of system output is further improved.

Description

Technical Field

[0001] The present application relates to the field of fuel cell power generation, and in particular to a method, device and system for controlling voltage fluctuations of a fuel cell stack, a computing device and a storage medium. Background Art

[0002] With the continuous growth of global energy demand and the urgent need for environmental protection, hydrogen energy stands out with its unique advantages and is regarded as the key to future energy transformation. Many deficiencies have been exposed during the operation of fixed hydrogen fuel cell power generation systems. Among them, excessive fluctuations in the voltage of the stack cells will affect the output stability of the fuel cell power generation system and the service life of the stack, and this will become more and more obvious as the operation time accumulates. Summary of the invention

[0003] In view of the above problems in the prior art, the present application provides a control method, device and system for cell stack voltage fluctuations, a computing device and a storage medium, which can smooth out excessive cell stack voltage fluctuations during the operation of a fuel cell power generation system, thereby improving the output stability of the fuel cell power generation system.

[0004] To achieve the above-mentioned purpose, the first aspect of the present application provides a method for controlling voltage fluctuation of a battery stack cell, comprising:

[0005] Obtaining the voltage of the battery cell in the battery stack collected by the battery stack cell voltage inspection unit;

[0006] It is determined whether the voltage exceeds a preset leveling range. If so, the operating parameters of the fuel cell power generation system are adjusted. If not, the fuel cell power generation system maintains the current operating state.

[0007] From the above, this application collects data from the single cell voltage inspection unit of the battery stack, and uses the feedback value of the single cell voltage as the input parameter of the control method. Under the premise of ensuring that the fuel cell power generation system meets the power generation demand, the system operating parameters are dynamically adjusted to control the single cell voltage fluctuation of the battery stack to always be within the set adjustment range, effectively suppressing the risk of reducing the life of the battery stack due to excessive single cell fluctuations, and further improving the stability of the system output

[0008] In order to achieve the above-mentioned object, the second aspect of the present application provides a control device for voltage fluctuation of a battery stack, comprising:

[0009] A voltage acquisition module is used to acquire the voltage of the battery cells in the battery stack collected by the battery stack cell voltage inspection unit;

[0010] The judgment and adjustment module is used to judge whether the voltage exceeds a preset leveling range. If so, the operating parameters of the fuel cell power generation system are adjusted; if not, the fuel cell power generation system maintains the current operating state.

[0011] To achieve the above-mentioned purpose, the third aspect of the present application provides a control system for voltage fluctuation of a battery stack cell, comprising: a battery stack cell voltage inspection unit, for collecting the voltage of a battery cell in the battery stack;

[0012] The control device for voltage fluctuation of battery stack cells according to the second aspect is used to implement any method according to the first aspect.

[0013] A fourth aspect of the present application provides a computing device, including:

[0014] processor, and

[0015] A memory having program instructions stored thereon, wherein when the program instructions are executed by the processor, the processor executes any of the methods described in the first aspect above.

[0016] A fifth aspect of the present application provides a computer-readable storage medium having program instructions stored thereon, wherein when the program instructions are executed by a computer, the computer implements any of the methods described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of an embodiment of a method for controlling voltage fluctuation of a battery stack provided in an embodiment of the present application;

[0018] Figure 2 A flowchart of a battery stack cell voltage inspection unit provided in an embodiment of the present application;

[0019] Figure 3 A flowchart of adjusting the operating parameters of a fuel cell power generation system when the voltage exceeds a preset leveling range provided in an embodiment of the present application;

[0020] Figure 4 A flowchart of adjusting the working parameters of a fuel cell power generation system when the minimum voltage is lower than the minimum value of a preset leveling range provided in an embodiment of the present application;

[0021] Figure 5 A working diagram of a fuel cell power generation system provided in an embodiment of the present application;

[0022] Figure 6 It is a structural schematic diagram of a control device for voltage fluctuation of a battery stack provided in an embodiment of the present application;

[0023] Figure 7 It is a structural schematic diagram of a computing device provided in an embodiment of the present application.

[0024] It should be understood that the size and shape of each block diagram in the above structural diagram are for reference only and should not constitute an exclusive interpretation of the embodiment of the present invention. The relative position and inclusion relationship between the blocks presented in the structural diagram are only schematic representations of the structural association between the blocks, and do not limit the physical connection method of the embodiment of the present invention. DETAILED DESCRIPTION

[0025] The technical solution provided by the present application is further described below with reference to the accompanying drawings and examples. It should be understood that the system structure and business scenarios provided in the examples of the present application are mainly to illustrate the possible implementation methods of the technical solution of the present application and should not be interpreted as the only limitation on the technical solution of the present application. It is known to those of ordinary skill in the art that with the evolution of the system structure and the emergence of new business scenarios, the technical solution provided by the present application is also applicable to similar technical problems.

[0026] It should be understood that the memory management solution provided in the embodiments of the present application includes a method and device for controlling voltage fluctuations of a battery stack. Since the principles of solving the problems in these technical solutions are the same or similar, some repetitions may not be repeated in the following specific embodiments, but it should be considered that these specific embodiments have been referenced to each other and can be combined with each other.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. In case of any inconsistency, the meaning described in this specification or the meaning derived from the contents recorded in this specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0028] [First embodiment of a method for controlling voltage fluctuation of a battery stack]

[0029] Excessive voltage fluctuations in a fuel cell stack can lead to a variety of consequences, including reducing the operating life of the fuel cell stack, causing reverse polarity, increasing the fluctuation amplitude of the fuel cell output, and affecting the overall performance of the fuel cell stack. When the fluctuation range of the single cell voltage is too large, reverse polarity may occur. This is because the larger the maximum voltage deviation rate (Dv), the larger the fluctuation range of the single cell voltage, the worse the voltage consistency, and the more likely it is to cause reverse polarity. At the same time, the larger the amplitude of the single cell voltage fluctuation, the worse the consistency of the single cell of the fuel cell stack; conversely, the smaller the amplitude of the single cell voltage fluctuation, the better the consistency of the single cell of the fuel cell stack. The inconsistency of the single cell voltage will directly affect the overall performance and stability of the fuel cell stack.

[0030] The operating parameters of the fuel cell stack, such as temperature, pressure, humidity and gas excess coefficient, have a significant impact on the consistency of the cell voltage. By adjusting these operating parameters, the uneven mass and heat transfer inside the stack can be improved, thereby improving the consistency of the cell voltage and thus improving the overall performance of the fuel cell stack. Therefore, smoothing the fluctuation of the cell voltage of the fuel cell stack is conducive to improving the operating life and stability of the fuel cell stack, and can also affect its overall performance and safety.

[0031] Based on this, the first embodiment of the present application provides a control method for the voltage fluctuation of a single cell of a stack, and more specifically, a control method for smoothing the voltage fluctuation of a single cell of a fuel cell power generation system in which multiple sub-stacks are electrically connected in series, and the hydrogen supply, oxygen supply and cooling circuits are connected in parallel. Among them, the stack is a stacked structure formed by connecting a plurality of unit batteries (also called battery cells or cells) in series. The stack cell voltage inspection unit is responsible for inspecting the cell voltages of all stacks in the fuel cell system, completing the collection of the cell voltages of the stack, determining the minimum and maximum cell voltages, and sending the minimum and maximum cell voltages to the FCU unit of the fuel cell system through CAN communication at regular intervals. The fuel cell power generation system is responsible for stabilizing the working state of the power generation system and providing a stable power output under the premise of meeting the load demand. The fuel cell power generation system includes components such as a fuel cell stack, an electronic control unit (FCU), an air compressor, a water pump, an ejector, a proportional valve, a solenoid valve and a tail exhaust valve. The electronic control unit (FCU) can realize functions such as signal acquisition, signal processing, communication processing of subsystems, system logic control, system status diagnosis and fault protection; the air compressor provides oxygen for the fuel cell power generation system; the water pump completes the cooling of the fuel cell power generation system, and the ejector, proportional valve, solenoid valve and tail exhaust valve combination complete the supply of hydrogen.

[0032] The method proposed in this application is applied to an electronic control unit (FCU). Figure 1 As shown, the method includes:

[0033] S110: Obtaining the voltage of a battery cell in the battery stack collected by the battery stack cell voltage inspection unit;

[0034] S120: Determine whether the voltage exceeds a preset smoothing range. If so, adjust the operating parameters of the fuel cell power generation system. If not, maintain the current operating state of the fuel cell power generation system.

[0035] In some embodiments, (S110) obtaining the voltage of a battery cell in the battery stack collected by the battery stack cell voltage inspection unit includes:

[0036] The highest voltage and the lowest voltage of the battery cells in the battery stack collected by the battery stack cell voltage inspection unit are obtained.

[0037] In specific implementation, for a system with multiple sub-stacks connected in series within a fuel cell system, the cell voltage monitoring unit (CVM) uses a single chip to collect data at the series node, and multiple chips can be used for collection in the middle part.

[0038] (1) Single chip acquisition

[0039] Definition: "Monolithic acquisition" generally refers to voltage measurement of a single cell or a group of closely connected cells. This means that each cell or small group of cells has its own voltage detection circuit. This provides accurate voltage data, which helps to find faulty cells at an early stage. It can achieve precise control and maintenance of each cell.

[0040] Application scenarios: At the series nodes, i.e. the two ends of the battery stack or important connection points, single-chip acquisition is usually used to ensure data accuracy at key locations.

[0041] (2) Multi-chip acquisition

[0042] Definition: "Multi-chip acquisition" refers to measuring the voltage of multiple unit cells as a set. This method can reduce the number of acquisition circuits, simplify the design and reduce costs. This reduces hardware cost and complexity. In some cases, the number of signal lines can be reduced, which helps to reduce the size and weight of the system.

[0043] Application scenario: In the middle part of the battery stack, a multi-chip collection method can be used, especially when there are a large number of unit cells and they are evenly distributed.

[0044] In a fuel cell system with multiple sub-stacks connected in series, a better balance can be achieved by combining single-chip acquisition and multi-chip acquisition methods.

[0045] Specifically, the process of the battery stack cell voltage monitoring unit (CVM) collecting the voltage of the battery cells in the battery stack is as follows: Figure 2 As shown, including:

[0046] Step S101:

[0047] Power on the cell voltage monitoring unit (CVM) of the battery stack. Go to step S102.

[0048] Step S102:

[0049] Start the cell stack voltage monitoring unit (CVM) and enter step S103.

[0050] Step S103:

[0051] The voltage of each cell in the battery stack in the system is collected to obtain the highest and lowest cell voltages. The process proceeds to step S104.

[0052] Step S104:

[0053] At a pre-agreed time, all collected data are sent to the FCU unit of the fuel cell system on a regular basis, and the process goes to step S105.

[0054] Step S105:

[0055] Whether a shutdown command is received, if the system needs to continue execution, jump to step S103, otherwise jump to step S106.

[0056] Step 105:

[0057] Exit working mode and save relevant data.

[0058] In some embodiments, Figure 3 As shown, (S120) determining whether the voltage exceeds a preset leveling range, and if so, adjusting the operating parameters of the fuel cell power generation system, including:

[0059] S310: Determine whether the lowest voltage is lower than a minimum value of a preset leveling range;

[0060] S320: If the minimum voltage is lower than the minimum value of the preset leveling range, adjusting the operating parameters of the fuel cell power generation system;

[0061] S330: If the lowest voltage is not lower than the minimum value of the preset smoothing range, determine whether the highest voltage is higher than the maximum value of the preset smoothing range;

[0062] S340: If the maximum voltage is higher than the maximum value of the preset suppression range, adjusting the operating parameters of the fuel cell power generation system;

[0063] S350: If the maximum voltage is not higher than the maximum value of the preset smoothing range, the fuel cell power generation system maintains the current operating state.

[0064] In some embodiments, Figure 4 As shown, (S320) if the minimum voltage is lower than the minimum value of the preset leveling range, adjusting the operating parameters of the fuel cell power generation system includes:

[0065] Adjust the interval and duration of tail exhaust purge. If the adjusted minimum voltage is not lower than the minimum value of the preset suppression range, adjust the interval and duration of tail exhaust purge to the initial state. If the adjusted minimum voltage is still lower than the minimum value of the preset suppression range, adjust the coolant inlet temperature to the stack. If the adjusted minimum voltage is not lower than the minimum value of the preset suppression range, adjust the coolant inlet temperature to the initial state. If the adjusted minimum voltage is still lower than the minimum value of the preset suppression range, adjust the air excess ratio. If the adjusted minimum voltage is not lower than the minimum value of the preset suppression range, adjust the air excess ratio to the initial state. If the adjusted minimum voltage is still lower than the minimum value of the preset suppression range, stop the machine for inspection.

[0066] In some embodiments, adjusting the interval and duration of tail exhaust purge includes:

[0067] Setting an upper limit for adjusting the purge interval and an upper limit for adjusting the purge duration, wherein the upper limit for adjusting the purge interval and the upper limit for adjusting the purge duration are the same;

[0068] The tail exhaust purge interval is reduced according to the first preset time step, and the tail exhaust purge duration is extended according to the second preset time step. When the tail exhaust purge interval is reduced to reach the purge interval adjustment upper limit, the adjustment ends.

[0069] In some embodiments, adjusting the coolant inlet temperature includes:

[0070] The coolant entering the stack temperature is increased according to a third preset temperature step, and the fuel cell power generation system runs for a first preset time after temperature balance. If the adjusted lowest voltage is not lower than the minimum value of the preset suppression range, the coolant entering the stack temperature is adjusted to an initial state. If the lowest voltage is still lower than the minimum value of the preset suppression range, the coolant entering the stack temperature is lowered according to the third preset temperature step, and the fuel cell power generation system runs for a first preset time after temperature balance. If the adjusted lowest voltage is not lower than the minimum value of the preset suppression range, the coolant entering the stack temperature is adjusted to an initial state.

[0071] In some embodiments, adjusting the excess air ratio includes:

[0072] The excess air ratio is increased, and after the fuel cell power generation system runs for a second preset time, it is determined whether the minimum voltage is lower than a minimum value of a preset smoothing range.

[0073] In specific implementation, the smoothing range of the fuel cell power generation system has an adjustment maximum value (MaxCellVol) and a minimum value (MinCellVol).

[0074] The fuel cell power generation system first detects whether the minimum voltage exceeds the limit. If the minimum voltage does not exceed the limit, it then detects whether the maximum voltage exceeds the limit. If neither voltage exceeds the limit, the fuel cell system maintains its current operating state.

[0075] When the minimum voltage < MinCellVol, the fuel cell power generation system can be adjusted through the following 3 steps:

[0076] 1) Reduce the interval of tail gas purge and extend the duration of tail gas purge. The purge interval is adjusted in steps of 0.5 s per minute (i.e., the first preset time step, which can also be set to other values), and the duration of tail gas purge is adjusted in steps of 0.2 s per minute (i.e., the second preset time step, which can also be set to other values). The upper limit of both adjustments is 2 s. The upper limit of the tail gas purge duration is used as the end flag for the adjustment of this step. If the situation where the minimum single cell voltage (i.e., the minimum voltage) < MinCellVol disappears, it returns to the initial operating state. If the situation where the minimum single cell voltage < MinCellVol still exists, go to 2);

[0077] 2) Adjust the coolant inlet temperature of the reactor, with an adjustment step of 5 °C (i.e., the third preset temperature step, which can also be set to other values). First, increase the temperature for operation. After the temperature is balanced, operate for 5 minutes (i.e., the first preset time, which can also be set to other values). If the situation where the minimum single cell voltage < MinCellVol disappears, lower the temperature to the initial temperature. If the situation where the minimum single cell voltage < MinCellVol still exists, the system operates at a reduced temperature of 5 °C. After the temperature is balanced, operate for 5 minutes. If the situation where the minimum single cell voltage < MinCellVol disappears, lower the temperature to the initial temperature. If the situation where the minimum single cell voltage < MinCellVol still exists, go to 3);

[0078] 3) Increase the air excess ratio, thereby increasing the pressure of the air entering the fuel cell stack. The hydrogen supply pressure and the pressure of the cooling system follow and increase. After the system operates for 2 minutes (i.e., the second preset time, which can also be set to other values), if the situation where the minimum single cell voltage < MinCellVol disappears, lower it to the initial operating point. If the situation where the minimum single cell voltage < MinCellVol still exists, the system needs to be shut down for inspection.

[0079] In some embodiments, if the maximum voltage is higher than the maximum value of the preset suppression range, the operating parameters of the fuel cell power generation system are adjusted, including:

[0080] If the maximum voltage is higher than the maximum value of the preset suppression range, reduce the air excess ratio.

[0081] In specific implementation, when the maximum cell voltage (i.e., maximum voltage) fed back by the cell voltage monitoring unit (CVM) of the fuel cell stack is greater than MaxCellVol, the fuel cell power generation system needs to lower the system operating point by reducing the excess ratio of the air supply and reducing the pressure of the air entering the fuel cell stack. The hydrogen supply pressure and the pressure of the cooling system will be reduced accordingly until the situation where the maximum cell voltage is greater than MaxCellVol disappears.

[0082] When implementing the method proposed in this application, please refer to Figure 5 The specific process and steps are as follows:

[0083] Step S201:

[0084] The fuel cell power generation system is powered on and the process proceeds to step S202 .

[0085] Step 202:

[0086] The fuel cell power generation system enters a standby state, waiting for a start command, and enters step S203.

[0087] Step S203: upon receiving a start command, proceed to step S204; otherwise, return to step S203.

[0088] Step S204: Obtain a power generation request, collect relevant data of the battery stack cell voltage inspection unit (ie, execute step S110), and proceed to step S205.

[0089] Step S205: Based on the preset upper and lower limits of the cell voltage fluctuation, determine whether the cell voltage fluctuation exceeds the limit (i.e., execute step S120 to determine whether the highest and lowest voltages of the battery cell exceed the limit). If so, go to step S206. If not, go to step S204 to respond to the power generation request and operate normally.

[0090] Step S206: Determine whether 1 minute has passed since the last round of adjustment. If yes (indicating that the last round of adjustment has ended and a new round of determination process has begun), go to step S207; otherwise, go to step S211.

[0091] Step S207: Determine whether the tail exhaust valve adjustment (i.e., the interval and duration of the tail exhaust purge) has been performed. If yes, go to step S208; otherwise, go to step S210.

[0092] Step S208: Determine whether the temperature adjustment of the coolant entering the stack has been performed, if yes, go to step S209, otherwise go to step S210.

[0093] Step S209: Determine whether the working point fine-tuning (i.e., adjustment of the air excess ratio) has been performed, if yes, go to step S211, otherwise go to step S210.

[0094] Step S210: perform three operations to smooth out the single cell voltage fluctuations in sequence, namely, adjusting the opening and closing time of the tail valve in the fuel cell power generation system, adjusting the temperature of the coolant in and out of the stack, and fine-tuning the working point of the fuel cell power generation system. Among the three steps, adjusting the tail valve is the fastest, and the working point adjustment will affect the output efficiency of the system. Therefore, the three methods of smoothing the single cell fluctuation operation are performed in order from first to last. After performing the corresponding operations, go to step S211.

[0095] Step S211: Determine whether the system is shut down, if yes, go to step S212, otherwise go to step S204.

[0096] The overall architecture of the implementation example of the present invention is based on CAN real-time communication, comprehensive data acquisition, real-time operating system and other technologies, so that the FCU unit of the fuel cell power generation system can collect data from the cell stack cell voltage inspection unit (CVM) in real time to judge the actual working conditions. By adjusting the tail valve, the liquid water inside the cell stack can be discharged in time to solve the problem of water flooding in the cell and the problem of low cell voltage. By adjusting the temperature of the coolant entering and leaving the stack, alternating working conditions can be provided for the catalyst, effectively inhibiting the oxidation of the catalyst, improving the activity of the catalyst of the fuel cell stack cell, and improving the performance of the cell. By fine-tuning the working point, the supply of oxidant and hydrogen can be changed, the microcirculation inside the cell stack can be changed, and the uneven distribution of heat and humidity can be improved, thereby achieving the purpose of stabilizing the working state of the cell stack in the fuel cell power generation system and smoothing voltage fluctuations.

[0097] Compared with the prior art, the beneficial effect of the present application is that the fuel cell power generation system collects data from the cell voltage monitoring unit (CVM) of the fuel cell stack, and the feedback value of the cell voltage is used as the input parameter of the control method. Under the premise of ensuring that the fuel cell power generation system meets the power generation demand, the system operating parameters are dynamically adjusted to control the cell voltage fluctuation of the cell stack to always be within the set adjustment range, effectively suppressing the risk of reduced stack life due to excessive cell fluctuations, and further improving the stability of the system output.

[0098] The control method can also be connected to a host computer control system to achieve online dynamic adjustment of the leveling range of the fuel cell power generation system, and manual adjustment can be achieved when necessary.

[0099] [Embodiment of the control device for voltage fluctuation of battery stack monomers of the present application]

[0100] like Figure 6 As shown, the embodiment of the present application provides a control device for voltage fluctuation of a battery stack cell, and the control device for voltage fluctuation of a battery stack cell can be used to implement the control method for voltage fluctuation of a battery stack cell in the above embodiment, such as Figure 6As shown, the control device for voltage fluctuation of a battery stack cell comprises a voltage acquisition module 610 and a judgment and adjustment module 620 .

[0101] A voltage acquisition module is used to acquire the voltage of the battery cells in the battery stack collected by the battery stack cell voltage inspection unit;

[0102] The judgment and adjustment module is used to judge whether the voltage exceeds a preset leveling range. If so, the operating parameters of the fuel cell power generation system are adjusted; if not, the fuel cell power generation system maintains the current operating state.

[0103] For details, please refer to the detailed description in the method embodiment, which will not be repeated here.

[0104] [Embodiment of the control system for voltage fluctuation of battery stack monomers of the present application]

[0105] An embodiment of the present application provides a control system for voltage fluctuations of battery stack cells, which includes a battery stack cell voltage inspection unit for collecting voltages of battery cells in the battery stack; and the above-proposed control device for voltage fluctuations of battery stack cells, which is used to implement the above-proposed control method for voltage fluctuations of battery stack cells.

[0106] For details, please refer to the detailed description in the method embodiment, which will not be repeated here.

[0107] [Embodiment of the computing device of the present application]

[0108] Figure 7 900 is a schematic structural diagram of a computing device 900 provided in an embodiment of the present application. The computing device can be used as a control device for voltage fluctuation of a battery stack cell, and executes each optional embodiment of the above-mentioned method for controlling voltage fluctuation of a battery stack cell. The computing device can be a terminal, or a chip or chip system inside the terminal. Figure 7 As shown, the computing device 900 includes: a processor 910 , a memory 920 , and a communication interface 930 .

[0109] It should be understood that Figure 7 The communication interface 930 in the computing device 900 shown may be used to communicate with other devices, and may specifically include one or more transceiver circuits or interface circuits.

[0110] The processor 910 may be connected to a memory 920. The memory 920 may be used to store the program code and data. Therefore, the memory 920 may be a storage unit inside the processor 910, or an external storage unit independent of the processor 910, or a component including a storage unit inside the processor 910 and an external storage unit independent of the processor 910.

[0111] Optionally, the computing device 900 may further include a bus. The memory 920 and the communication interface 930 may be connected to the processor 910 via the bus. The bus may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 A line without an arrow is used to represent the bus, but this does not mean that there is only one bus or one type of bus.

[0112] It should be understood that in the embodiment of the present application, the processor 910 may adopt a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. Alternatively, the processor 910 may adopt one or more integrated circuits to execute relevant programs to implement the technical solutions provided in the embodiment of the present application.

[0113] The memory 920 may include a read-only memory and a random access memory, and provides instructions and data to the processor 910. A portion of the processor 910 may also include a nonvolatile random access memory. For example, the processor 910 may also store information on the device type.

[0114] When the computing device 900 is running, the processor 910 executes the computer-executable instructions in the memory 920 to perform any operation step of the above method and any optional embodiment thereof.

[0115] It should be understood that the computing device 900 according to the embodiment of the present application can correspond to the corresponding subjects in the methods according to the embodiments of the present application, and the above-mentioned and other operations and / or functions of each module in the computing device 900 are respectively for implementing the corresponding processes of each method of the present embodiment. For the sake of brevity, they will not be repeated here.

[0116] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0117] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0118] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0119] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0120] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0121] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0122] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, it is used to execute the above method, which includes at least one of the solutions described in the above embodiments.

[0123] The computer storage medium of the embodiment of the present application can adopt any combination of one or more computer-readable media. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive lists) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing programs, which can be used by instruction execution systems, devices or devices or used in combination with them.

[0124] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0125] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0126] Computer program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0127] In addition, the words "first, second, third, etc." or module A, module B, module C and other similar terms in the specification and claims are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that the specific order or sequence can be interchanged where permitted so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0128] In the above description, the numbers representing the steps, such as S110, S120, etc., do not necessarily mean that the steps will be executed in this manner. If permitted, the order of the steps can be interchanged or they can be executed simultaneously.

[0129] The term "comprising" as used in the description and claims should not be interpreted as being limited to what is listed thereafter; it does not exclude other elements or steps. Therefore, it should be interpreted as specifying the presence of the features, integers, steps or components mentioned, but does not exclude the presence or addition of one or more other features, integers, steps or components and groups thereof. Therefore, the expression "a device comprising means A and B" should not be limited to a device consisting of components A and B only.

[0130] References to "one embodiment" or "an embodiment" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application. Therefore, the phrases "in one embodiment" or "in an embodiment" appearing in various places in this specification do not necessarily refer to the same embodiment, but may refer to the same embodiment. In addition, in one or more embodiments, the particular features, structures, or characteristics can be combined in any appropriate manner, as would be apparent to one of ordinary skill in the art from this disclosure.

[0131] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present application, all of which belong to the scope of protection of the present application.

Claims

1. A method for controlling voltage fluctuation of a battery stack, characterized in that: include: Obtaining the voltage of the battery cell in the battery stack collected by the battery stack cell voltage inspection unit; It is determined whether the voltage exceeds a preset leveling range. If so, the operating parameters of the fuel cell power generation system are adjusted. If not, the fuel cell power generation system maintains the current operating state.

2. The method according to claim 1, characterized in that Obtaining the voltage of the battery cell in the battery stack collected by the battery stack cell voltage inspection unit includes: The highest voltage and the lowest voltage of the battery cells in the battery stack collected by the battery stack cell voltage inspection unit are obtained.

3. The method according to claim 2, characterized in that Determining whether the voltage exceeds a preset leveling range, and if so, adjusting operating parameters of the fuel cell power generation system, including: Determine whether the minimum voltage is lower than the minimum value of the preset smooth range. If the minimum voltage is lower than the minimum value of the preset smooth range, adjust the operating parameters of the fuel cell power generation system. If the minimum voltage is not lower than the minimum value of the preset smooth range, determine whether the maximum voltage is higher than the maximum value of the preset smooth range. If the maximum voltage is higher than the maximum value of the preset smooth range, adjust the operating parameters of the fuel cell power generation system. If the maximum voltage is not higher than the maximum value of the preset smooth range, the fuel cell power generation system maintains the current operating state.

4. The method according to claim 3, characterized in that If the minimum voltage is lower than the minimum value of the preset suppression range, adjusting the operating parameters of the fuel cell power generation system includes: Adjust the interval and duration of tail exhaust purge. If the adjusted minimum voltage is not lower than the minimum value of the preset suppression range, adjust the interval and duration of tail exhaust purge to the initial state. If the adjusted minimum voltage is still lower than the minimum value of the preset suppression range, adjust the coolant inlet temperature to the stack. If the adjusted minimum voltage is not lower than the minimum value of the preset suppression range, adjust the coolant inlet temperature to the initial state. If the adjusted minimum voltage is still lower than the minimum value of the preset suppression range, adjust the air excess ratio. If the adjusted minimum voltage is not lower than the minimum value of the preset suppression range, adjust the air excess ratio to the initial state. If the adjusted minimum voltage is still lower than the minimum value of the preset suppression range, stop the machine for inspection.

5. The method according to claim 4, characterized in that Adjust the interval and duration of tail exhaust purge, including: Setting an upper limit for adjusting the purge interval and an upper limit for adjusting the purge duration, wherein the upper limit for adjusting the purge interval and the upper limit for adjusting the purge duration are the same; The tail exhaust purge interval is reduced according to the first preset time step, and the tail exhaust purge duration is extended according to the second preset time step. When the tail exhaust purge interval is reduced to reach the purge interval adjustment upper limit, the adjustment ends.

6. The method according to claim 4, characterized in that Adjust the coolant inlet temperature, including: The coolant entering the stack temperature is increased according to a third preset temperature step, and the fuel cell power generation system runs for a first preset time after temperature balance. If the adjusted lowest voltage is not lower than the minimum value of the preset suppression range, the coolant entering the stack temperature is adjusted to an initial state. If the lowest voltage is still lower than the minimum value of the preset suppression range, the coolant entering the stack temperature is lowered according to the third preset temperature step, and the fuel cell power generation system runs for a first preset time after temperature balance. If the adjusted lowest voltage is not lower than the minimum value of the preset suppression range, the coolant entering the stack temperature is adjusted to an initial state.

7. The method according to claim 4, characterized in that Adjust the excess air ratio, including: The excess air ratio is increased, and after the fuel cell power generation system runs for a second preset time, it is determined whether the minimum voltage is lower than a minimum value of a preset smoothing range.

8. The method according to claim 3, characterized in that If the maximum voltage is higher than the maximum value of the preset suppression range, adjusting the operating parameters of the fuel cell power generation system includes: If the maximum voltage is higher than a maximum value of a preset suppression range, the air excess ratio is reduced.

9. A control device for voltage fluctuation of a battery stack, characterized in that: include: A voltage acquisition module is used to acquire the voltage of the battery cells in the battery stack collected by the battery stack cell voltage inspection unit; The judgment and adjustment module is used to judge whether the voltage exceeds a preset leveling range. If so, the operating parameters of the fuel cell power generation system are adjusted; if not, the fuel cell power generation system maintains the current operating state.

10. A control system for voltage fluctuation of a battery stack, characterized in that: include: A battery stack cell voltage inspection unit, used to collect the voltage of the battery cells in the battery stack; The control device for voltage fluctuation of a battery stack cell as described in claim 9 is used to implement the control method for voltage fluctuation of a battery stack cell as described in any one of claims 1 to 8.

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