Low-temperature starting method, device, medium and system of fuel cell

Abstract

The invention provides a low-temperature starting method, device, medium and system of a fuel cell, the method determines the flow variable quantity of cooling liquid based on the heat production power change and the temperature difference change, not only ensures the heating rate, but also avoids the burn-in risk, and compared with a pressure adjusting mode in an existing scheme, the success rate of low-temperature starting is improved, and the starting efficiency is improved. The problem that the low-temperature starting success rate of the fuel cell in the existing scheme is low due to the fact that the low-temperature starting success rate of the fuel cell is low due to the fact that the low-temperature starting success rate of the fuel cell is mostly increased by adjusting the pressure in the existing scheme is solved.

Description

Technical Field

[0001] The present application relates to the technical field of low-temperature start-up of fuel cells, and in particular to a low-temperature start-up method, device, medium and system for fuel cells. Background Art

[0002] For proton exchange membrane fuel cells, low-temperature startup refers to successfully starting from below zero and running to normal operating temperature (about 80°C). The PEMFC cathode catalyst layer is both the place where the electrochemical reaction takes place and the place where the reactant water is generated. When the fuel cell is started in a sub-zero environment, the water generated by the reaction may freeze, block the gas channel, and prevent the reactants from reaching the catalyst surface; at the same time, ice will adhere to the catalyst surface, reducing the electrochemical active area, thereby reducing the reaction rate or even stopping it, resulting in low-temperature startup failure. Frequent freeze-thaw cycles will destroy the catalyst structure, leading to catalyst loss, resulting in reduced fuel cell performance and shortened life.

[0003] Most existing solutions improve the success rate of low-temperature startup of fuel cells by adjusting pressure. However, since pressure has a low influence on the success rate of low-temperature startup of fuel cells, the success rate of low-temperature startup of fuel cells in existing solutions is low. Summary of the invention

[0004] The main purpose of the present application is to provide a low-temperature start-up method, device, medium and system for a fuel cell, so as to at least solve the problem that most existing solutions improve the success rate of low-temperature start-up of the fuel cell by adjusting the pressure, but the pressure has a low influence on the success rate of low-temperature start-up of the fuel cell, resulting in a low success rate of low-temperature start-up of the fuel cell in the existing solutions.

[0005] In order to achieve the above object, according to one aspect of the present application, a low temperature start-up method for a fuel cell is provided, the method comprising:

[0006] Determining steps: determining that the current flow rate is the minimum flow rate of the coolant;

[0007] The first acquisition step: using the current flow rate to drive the fuel cell to start at low temperature, and obtaining the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle, to obtain the first heat generation power of the fuel cell stack and the first coolant temperature;

[0008] A second acquisition step: acquiring the heat generation power of the battery stack and the coolant temperature at the end of the current cycle, obtaining a second heat generation power of the battery stack and a second coolant temperature, and determining a current regulation flow rate according to the heat generation power of the first battery stack, the first coolant temperature, the second heat generation power of the battery stack and the second coolant temperature;

[0009] Processing steps: When the second coolant temperature is less than or equal to the preset temperature, the current flow rate is updated to the sum of the current flow rate and the current adjusted flow rate, and the first acquisition step, the second acquisition step and the processing step are repeated until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails.

[0010] Optionally, determining the current regulating flow rate according to the first fuel cell stack heat generation power, the first coolant temperature, the second fuel cell stack heat generation power and the second coolant temperature includes:

[0011] Determine the current cycle power change as the difference between the heat generation power of the second fuel cell stack and the heat generation power of the first fuel cell stack;

[0012] Determine the current cycle temperature change as the difference between the second coolant temperature and the first coolant temperature;

[0013] The current regulated flow rate is determined according to the current cycle power change and the current cycle temperature change.

[0014] Optionally, determining the current regulated flow rate according to the current cycle power variation and the current cycle temperature variation includes:

[0015] According to Δq=ΔP / C p ρΔT, determining the current regulated flow rate;

[0016] Wherein, Δq is the current regulated flow, ΔP is the current cycle power change, C p is the constant pressure specific heat capacity, ρ is the coolant density, and ΔT is the temperature change of the current cycle.

[0017] Optionally, before the second obtaining step, the method further comprises:

[0018] According to t i =V / q i , determine the current cycle time;

[0019] The current cycle time is the time required for the current cycle, t i is the current cycle time, V is the total volume of the fuel cell circulation loop, q i is the current flow rate in the current cycle.

[0020] Optionally, after determining the current cycle time, the method further comprises:

[0021] When the total cycle time is less than or equal to the time threshold, the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low-temperature startup of the fuel cell is successful or fails, and the total cycle time is the total time required for the first cycle to the current cycle to be completed;

[0022] When the total cycle time is greater than the time threshold, the total cycle stack heat generation power change curve is used to derive the time to obtain a derivative result, and when the derivative result is less than or equal to 0, it is determined that the low temperature start of the fuel cell has failed;

[0023] When the derivation result is greater than 0, the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low-temperature startup of the fuel cell succeeds or fails.

[0024] Optionally, after acquiring the heat generation power of the battery stack and the coolant temperature at the end time of the current cycle and obtaining the second heat generation power of the battery stack and the second coolant temperature, the method further includes:

[0025] When the second coolant temperature is greater than the preset temperature, it is determined that the low temperature start-up of the fuel cell is successful.

[0026] Optionally, obtaining the heat generation power of the battery stack and the coolant temperature at the start time of the current cycle to obtain the first heat generation power of the battery stack includes:

[0027] According to P i =I i (U low -U i )×N cell , determining the heat generation power of the first fuel cell stack;

[0028] Among them, P i is the heat generation power of the first stack, N cell is the number of battery cells in the fuel cell, U low is the potential corresponding to the lower calorific value of hydrogen combustion, at I i In the case of the current required for the fuel cell to generate heat by itself, U i is the average value of the voltage of the fuel cell within the current cycle, i In the case of the voltage required for the fuel cell to generate heat by itself, I i is the average value of the current of the fuel cell in the current cycle.

[0029] According to another aspect of the present application, a low-temperature starting device for a fuel cell is provided, the device comprising:

[0030] A first determining unit is used to perform a determining step: determining that a current flow rate is a minimum flow rate of the coolant;

[0031] A first acquisition unit is used to perform a first acquisition step: using the current flow rate to drive the fuel cell to start at low temperature, and acquiring the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle, to obtain a first heat generation power of the fuel cell stack and a first coolant temperature;

[0032] A second acquisition unit is used to perform a second acquisition step: acquiring the heat generation power of the battery stack and the coolant temperature at the end time of the current cycle, obtaining a second heat generation power of the battery stack and a second coolant temperature, and determining a current regulation flow rate according to the first heat generation power of the battery stack, the first coolant temperature, the second heat generation power of the battery stack and the second coolant temperature;

[0033] The first processing unit is used to execute a processing step: when the second coolant temperature is less than or equal to a preset temperature, the current flow rate is updated to the sum of the current flow rate and the current regulated flow rate, and the first acquisition step, the second acquisition step and the processing step are repeatedly executed to improve the success rate of the low-temperature start-up of the fuel cell, until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails.

[0034] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described.

[0035] According to another aspect of the present application, a low-temperature start-up system for a fuel cell is provided, the system comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the described methods.

[0036] By applying the technical solution of the present application, the current flow rate is used to drive the fuel cell to start at a low temperature, and the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle are obtained to obtain the first heat generation power of the fuel cell stack and the first coolant temperature; the heat generation power of the fuel cell stack and the coolant temperature at the end time of the current cycle are obtained to obtain the second heat generation power of the fuel cell stack and the second coolant temperature, and the current regulated flow rate is determined according to the first heat generation power of the fuel cell stack, the first coolant temperature, the second heat generation power of the fuel cell stack and the second coolant temperature; when the second coolant temperature is less than or equal to the preset temperature, the current flow rate is updated to the current flow rate. The sum of the amount and the current regulated flow rate is calculated, and the first acquisition step, the second acquisition step and the processing step are repeatedly executed until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails. The change in coolant flow rate is determined based on the change in heat generation power and the change in temperature difference, which not only ensures the heating rate but also avoids the risk of stack burning. Compared with the existing scheme of adjusting pressure, the success rate of low-temperature start-up is improved, and the problem that most of the existing schemes improve the success rate of low-temperature start-up of fuel cells by adjusting pressure, but the influence of pressure on the success rate of low-temperature start-up of fuel cells is relatively low, thereby making the success rate of low-temperature start-up of fuel cells in the existing schemes low. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0038] Figure 1 A schematic flow chart of a low-temperature start-up method for a fuel cell provided in accordance with an embodiment of the present application is shown;

[0039] Figure 2 A schematic diagram of a process for determining a current regulated flow rate according to an embodiment of the present application is shown;

[0040] Figure 3 A schematic flow chart of a low-temperature start-up method for a fuel cell after determining a current cycle time according to an embodiment of the present application is shown;

[0041] Figure 4 A schematic flow chart of another low-temperature start-up method for a fuel cell provided in accordance with an embodiment of the present application is shown;

[0042] Figure 5 A structural block diagram of a low-temperature starting device for a fuel cell provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] For the convenience of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0047] The cathode catalyst layer of PEMFC refers to a layer of catalytic material located between the cathode electrode and the proton exchange membrane in the proton exchange membrane fuel cell (PEMFC). This catalyst layer is usually made of precious metals such as platinum or its alloys, and is used to catalyze the electrochemical reaction of hydrogen and oxygen to produce electrons and water. The cathode catalyst layer plays a vital role in PEMFC and affects the performance and stability of the fuel cell.

[0048] As introduced in the background technology, for proton exchange membrane fuel cells, low temperature start refers to successfully starting from below zero and running to normal operating temperature (about 80°C). The cathode catalyst layer of PEMFC is both the place where the electrochemical reaction takes place and the place where the reactant water is generated. When the fuel cell is started in a sub-zero environment, the water generated by the reaction may freeze, block the gas channel, and hinder the reactants from reaching the catalyst surface; at the same time, ice will adhere to the catalyst surface, reducing the electrochemical active area, thereby reducing the reaction rate or even stopping it, resulting in failure of low temperature start. Frequent freeze-thaw cycles will destroy the catalyst structure, cause catalyst loss, and cause fuel cell performance to decrease and shorten life. In order to solve the problem that most existing solutions increase the success rate of low temperature start of fuel cells by adjusting pressure, but due to the low influence of pressure on the success rate of low temperature start of fuel cells, the success rate of low temperature start of fuel cells in existing solutions is low, the embodiments of the present application provide a low temperature start method, device, medium and system for fuel cells.

[0049] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0050] In this embodiment, a low-temperature start-up method for a fuel cell is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0051] Figure 1 It is a schematic flow chart of a low-temperature start-up method of a fuel cell provided according to an embodiment of the present application.

[0052] like Figure 1 As shown, the method comprises the following steps:

[0053] Step S101, determination step: determining that the current flow rate is the minimum flow rate of the coolant;

[0054] The setting of the minimum flow rate of the coolant is related to the structure of the circulation loop of the fuel cell, which will not be elaborated here.

[0055] Step S102, a first acquisition step: using the current flow rate to drive the fuel cell to start at low temperature, and obtaining the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle, to obtain the first heat generation power of the fuel cell stack and the first coolant temperature;

[0056] Specifically, the current flow rate is used to drive the fuel cell to start at low temperature, and then the heat generation power of the fuel cell stack and the coolant temperature at the beginning of the current cycle are obtained to adjust the coolant flow rate subsequently.

[0057] In one embodiment of the present application, the step S102 of obtaining the heat generation power of the battery stack and the coolant temperature at the start time of the current cycle to obtain the first heat generation power of the battery stack includes:

[0058] According to P i =I i (U low -U i )×N cell , determine the heat generation power of the first fuel cell stack;

[0059] Among them, P i is the heat generation power of the first stack, N cell is the number of battery cells in the fuel cell, U low is the potential corresponding to the lower calorific value of hydrogen combustion, at I i When U is the current required for the fuel cell to generate heat by itself, i is the average value of the fuel cell voltage in the current cycle, i In the case of the voltage required for the fuel cell to generate heat by itself, I i is the average value of the fuel cell current in the current cycle.

[0060] The current or voltage required for the fuel cell to generate heat by itself is determined according to the model of the fuel cell. By setting one of them as a quantitative value and the other as a measured value, the determination of the heat generation power of the first fuel cell stack is more in line with actual working conditions.

[0061] Step S103, a second acquisition step: acquiring the heat generation power of the battery stack and the coolant temperature at the end of the current cycle, obtaining the second heat generation power of the battery stack and the second coolant temperature, and determining the current regulated flow rate according to the first heat generation power of the battery stack, the first coolant temperature, the second heat generation power of the battery stack and the second coolant temperature;

[0062] Specifically, by obtaining the heat generation power of the fuel cell stack and the coolant temperature at the end of the current cycle, it is convenient to determine the current adjustment flow rate based on the heat generation power of the fuel cell stack and the coolant temperature at the start of the current cycle. By adjusting the flow rate of the coolant, the success rate of low-temperature startup can be improved compared with the existing scheme.

[0063] In one embodiment of the present application, Figure 2 As shown, the current adjustment flow rate is determined according to the first stack heat generation power, the first coolant temperature, the second stack heat generation power and the second coolant temperature in step S103, including the following steps:

[0064] Step S201, determining the current cycle power change as the difference between the heat generation power of the second fuel cell stack and the heat generation power of the first fuel cell stack;

[0065] Step S202, determining the current cycle temperature change as the difference between the second coolant temperature and the first coolant temperature;

[0066] Step S203, determining the current regulating flow rate according to the current cycle power change and the current cycle temperature change.

[0067] Specifically, the current cycle power change is determined as the difference between the heat generation power of the second stack and the heat generation power of the first stack, and the current cycle temperature change is determined as the difference between the second coolant temperature and the first coolant temperature, thereby taking the change in the heat generation power of the stack and the change in the coolant temperature into consideration, so that the current regulated flow rate is more in line with actual operating conditions.

[0068] In one embodiment of the present application, determining the current regulation flow rate according to the current cycle power change and the current cycle temperature change includes:

[0069] According to Δq=ΔP / C p ρΔT, determines the current regulated flow;

[0070] Among them, Δq is the current regulated flow, ΔP is the current cycle power change, C p is the specific heat capacity at constant pressure, ρ is the coolant density, and ΔT is the temperature change of the current cycle.

[0071] Specifically, the change in coolant flow rate is determined based on the change in heat generation power and temperature difference, which not only ensures the heating rate but also avoids the risk of pile burning.

[0072] In one embodiment of the present application, before the second acquisition step in step S103, the method further includes:

[0073] According to t i =V / q i , determine the current cycle time;

[0074] Among them, the current cycle time is the time required for the current cycle, t i is the current cycle time, V is the total volume of the fuel cell cycle, q i is the current flow rate in the current cycle.

[0075] Specifically, by finding the current cycle time, it is convenient to determine whether the low-temperature startup is successful based on the total cycle time.

[0076] like Figure 3 As shown, after determining the current cycle time, the method further includes the following steps:

[0077] Step S301, when the total cycle time is less than or equal to the time threshold, repeatedly executing the first acquisition step, the second acquisition step and the processing step until it is determined that the low temperature start of the fuel cell is successful, or the low temperature start fails, and the total cycle time is the total time required for the first cycle to the current cycle to be completed;

[0078] Step S302, when the total cycle time is greater than the time threshold, the total cycle stack heat generation power change curve is used to derive the time to obtain a derivative result, and when the derivative result is less than or equal to 0, it is determined that the low temperature start of the fuel cell has failed;

[0079] Step S303, when the derivative result is greater than 0, the first acquisition step, the second acquisition step and the processing step are repeatedly executed until it is determined that the low temperature startup of the fuel cell succeeds or fails.

[0080] Specifically, the time threshold can be 180s. When the total cycle time is less than or equal to 180s, the first acquisition step, the second acquisition step and the processing step are repeated until it is determined that the low-temperature start of the fuel cell is successful, or the low-temperature start fails. When the total cycle time is greater than 180s, the total cycle stack heat generation power change curve is used to derive the time to obtain the derivative result, and finally, based on the comparison result of the derivative result with 0, it is determined that the low-temperature start of the fuel cell has failed, or the first acquisition step, the second acquisition step and the processing step are repeated until it is determined that the low-temperature start of the fuel cell is successful, or the low-temperature start fails. The total cycle time and the derivative results of the total cycle stack heat generation power change curve with respect to time are taken into consideration to avoid a situation where the success cannot be achieved for a long time without any reminder.

[0081] Step S104, processing step: when the second coolant temperature is less than or equal to the preset temperature, the current flow rate is updated to the sum of the current flow rate and the current adjusted flow rate, and the first acquisition step, the second acquisition step and the processing step are repeated until it is determined that the low-temperature start of the fuel cell is successful, or the low-temperature start fails.

[0082] The preset temperature may be 60°C.

[0083] In the above steps, the current flow is used to drive the fuel cell to start at low temperature, and the heat generation power of the stack and the coolant temperature at the start time of the current cycle are obtained to obtain the first heat generation power of the stack and the first coolant temperature; the heat generation power of the stack and the coolant temperature at the end time of the current cycle are obtained to obtain the second heat generation power of the stack and the second coolant temperature, and the current regulated flow is determined according to the first heat generation power of the stack, the first coolant temperature, the second heat generation power of the stack and the second coolant temperature; when the second coolant temperature is less than or equal to the preset temperature, the current flow is updated to the sum of the current flow and the current regulated flow, and the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low temperature start of the fuel cell is successful or the low temperature start fails, and the coolant flow change is determined based on the heat generation power change and the temperature difference change, which not only ensures the heating rate but also avoids the risk of stack burning. Compared with the existing scheme of adjusting pressure, the success rate of low temperature start is improved, and the problem that most of the existing schemes improve the success rate of low temperature start of the fuel cell by adjusting pressure, but the influence of pressure on the success rate of low temperature start of the fuel cell is low, so that the success rate of low temperature start of the fuel cell of the existing scheme is low.

[0084] In one embodiment of the present application, after obtaining the heat generation power of the battery stack and the coolant temperature at the end of the current cycle and obtaining the second heat generation power of the battery stack and the second coolant temperature, the method further includes:

[0085] When the temperature of the second coolant is greater than the preset temperature, it is determined that the low temperature start-up of the fuel cell is successful.

[0086] Specifically, when the temperature of the second coolant is greater than 60° C., it is determined that the low-temperature startup of the fuel cell is successful, and a prompt message can be provided to remind the user that the low-temperature startup of the fuel cell is successful.

[0087] Small cooling circulation loop: It is composed of a water pump and a control valve connected in series with the stack cooling circuit through pipelines, and is used to control the circulation loop of the coolant under low temperature conditions.

[0088] The flow rate of the cooling small circulation loop is one of the important parameters that comprehensively affects the heat generation of the fuel cell stack itself and the heat exchange between the fuel cell stack and the outside world. Low-temperature startup is highly sensitive to the coolant flow rate of the small circulation loop. During the low-temperature startup process below -25°C, the dynamic control method based on variable step size iterative adjustment of the small circulation cooling flow rate has the following advantages:

[0089] At the beginning of low-temperature startup, the temperature of the battery stack is low and the heat generation power is small. In order to avoid the melting rate being lower than the freezing rate, the coolant flow rate should be as small as possible to reduce the heat loss caused by heat exchange with the outside world, reduce the startup time and the possibility of startup failure;

[0090] When the low-temperature startup process is carried out until the temperature of the battery stack rises above zero, the heat generation power increases. The growth rate of the small-circulation coolant flow rate is determined by the heat generation power increment and temperature difference change within the cycle, which can promote more uniform heating of the battery stack and avoid local hot spots. The performance distribution consistency of each single battery during the low-temperature startup process is better, avoiding the risk of overheating and burning the stack;

[0091] The coolant completes a cycle as an adjustment step, and the coolant flow rate of the small cycle is dynamically adjusted in each step, and the action cycle and adjustment range of the adjustment are comprehensively weighed to avoid over-frequency or slow adjustment, and also to avoid excessive adjustment range exceeding the cross pressure limit;

[0092] Due to the precise control of the coolant flow, the set temperature for exiting the small cycle can be increased, that is, the time of using the cooling small cycle can be increased, which is beneficial to increasing the temperature rise rate of the battery stack, reducing heat loss, and shortening the low-temperature startup time.

[0093] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the low-temperature starting method of the fuel cell of the present application will be described in detail below in combination with specific embodiments.

[0094] This embodiment relates to a specific low temperature start-up method for a fuel cell, such as Figure 4 As shown, the following steps are included:

[0095] Determining steps: determining that the current flow rate is the minimum flow rate of the coolant;

[0096] The first acquisition step: using the current flow rate to drive the fuel cell to start at low temperature, and obtaining the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle, to obtain the first heat generation power of the fuel cell stack and the first coolant temperature;

[0097] The second acquisition step: acquiring the heat generation power of the battery stack and the coolant temperature at the end of the current cycle, obtaining the second heat generation power of the battery stack and the second coolant temperature, and determining the current adjustment flow rate according to the first heat generation power of the battery stack, the first coolant temperature, the second heat generation power of the battery stack and the second coolant temperature;

[0098] Specifically, determining the current cycle power change as the difference between the heat generation power of the second stack and the heat generation power of the first stack;

[0099] Determine the current cycle temperature change as the difference between the second coolant temperature and the first coolant temperature;

[0100] Processing step: when the temperature of the second coolant is less than or equal to the preset temperature, the current flow rate is updated to the sum of the current flow rate and the current regulated flow rate, and the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low temperature start of the fuel cell is successful or the low temperature start fails;

[0101] When the total cycle time is less than or equal to the time threshold, the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low-temperature startup of the fuel cell is successful or the low-temperature startup fails, and the total cycle time is the total time required for the first cycle to the current cycle to be completed;

[0102] When the total cycle time is greater than the time threshold, the total cycle stack heat generation power change curve is used to derive the time to obtain a derivative result, and when the derivative result is less than or equal to 0, it is determined that the low temperature start of the fuel cell has failed;

[0103] When the derivative result is greater than 0, the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low temperature startup of the fuel cell succeeds or fails;

[0104] When the temperature of the second coolant is greater than the preset temperature, it is determined that the low temperature start-up of the fuel cell is successful.

[0105] The fuel cell is driven to start at low temperature by using the current flow rate, and the heat generation power of the stack and the coolant temperature at the start time of the current cycle are obtained to obtain the first heat generation power of the stack and the first coolant temperature; the heat generation power of the stack and the coolant temperature at the end time of the current cycle are obtained to obtain the second heat generation power of the stack and the second coolant temperature, and the current regulated flow rate is determined according to the first heat generation power of the stack, the first coolant temperature, the second heat generation power of the stack and the second coolant temperature; when the second coolant temperature is less than or equal to the preset temperature, the current flow rate is updated to the sum of the current flow rate and the current regulated flow rate, and the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low temperature start of the fuel cell is successful or the low temperature start fails, and the coolant flow rate change is determined based on the heat generation power change and the temperature difference change, so as to ensure the heating rate and avoid the risk of stack burning, and improve the success rate of low temperature start compared with the existing scheme of adjusting pressure, and solve the problem that most of the existing schemes improve the success rate of low temperature start of the fuel cell by adjusting pressure, but the influence of pressure on the success rate of low temperature start of the fuel cell is low, so that the success rate of low temperature start of the fuel cell of the existing scheme is low.

[0106] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0107] The embodiment of the present application also provides a low-temperature starting device for a fuel cell. It should be noted that the low-temperature starting device for a fuel cell in the embodiment of the present application can be used to execute the low-temperature starting method for a fuel cell provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred embodiments, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0108] The following is an introduction to the low-temperature starting device of the fuel cell provided in the embodiments of the present application.

[0109] Figure 5 1 is a structural block diagram of a low temperature starting device for a fuel cell provided according to an embodiment of the present application. Figure 5 As shown, the device comprises:

[0110] The first determining unit 51 is used to perform a determining step: determining that the current flow rate is the minimum flow rate of the coolant;

[0111] The first acquisition unit 52 is used to perform a first acquisition step: using the current flow rate to drive the fuel cell to start at low temperature, and obtaining the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle, to obtain the first heat generation power of the fuel cell stack and the first coolant temperature;

[0112] The second acquisition unit 53 is used to perform the second acquisition step: acquiring the heat generation power of the electric stack and the coolant temperature at the end time of the current cycle, obtaining the second heat generation power of the electric stack and the second coolant temperature, and determining the current adjustment flow rate according to the first heat generation power of the electric stack, the first coolant temperature, the second heat generation power of the electric stack and the second coolant temperature;

[0113] The first processing unit 54 is used to execute a processing step: when the second coolant temperature is less than or equal to a preset temperature, the current flow rate is updated to the sum of the current flow rate and the current regulated flow rate, and the first acquisition step, the second acquisition step and the processing step are repeatedly executed to improve the success rate of the low-temperature start-up of the fuel cell, until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails.

[0114] In the above device, the current flow is used to drive the fuel cell to start at low temperature, and the heat generation power of the stack and the coolant temperature at the start time of the current cycle are obtained to obtain the first heat generation power of the stack and the first coolant temperature; the heat generation power of the stack and the coolant temperature at the end time of the current cycle are obtained to obtain the second heat generation power of the stack and the second coolant temperature, and the current regulated flow is determined according to the first heat generation power of the stack, the first coolant temperature, the second heat generation power of the stack and the second coolant temperature; when the second coolant temperature is less than or equal to the preset temperature, the current flow is updated to the sum of the current flow and the current regulated flow, and the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low temperature start of the fuel cell is successful or the low temperature start fails, and the coolant flow change is determined based on the change in heat generation power and the change in temperature difference, which not only ensures the heating rate but also avoids the risk of stack burning. Compared with the existing scheme of adjusting pressure, the success rate of low temperature start is improved, and the problem that most of the existing schemes improve the success rate of low temperature start of the fuel cell by adjusting pressure, but the influence of pressure on the success rate of low temperature start of the fuel cell is low, so that the success rate of low temperature start of the fuel cell of the existing scheme is low.

[0115] In one embodiment of the present application, the second acquisition unit includes a first determination module, a second determination module and a third determination module.

[0116] The first determination module is used to determine that the current cycle power change is the difference between the heat generation power of the second stack and the heat generation power of the first stack;

[0117] The second determination module is used to determine the current cycle temperature change as the difference between the second coolant temperature and the first coolant temperature;

[0118] The third determination module is used to determine the current regulation flow rate according to the current cycle power change amount and the current cycle temperature change amount.

[0119] In one embodiment of the present application, the third determination module includes a determination submodule,

[0120] The determination submodule is used to determine the p ρΔT, determines the current regulated flow;

[0121] Among them, Δq is the current regulated flow, ΔP is the current cycle power change, C p is the specific heat capacity at constant pressure, ρ is the coolant density, and ΔT is the temperature change of the current cycle.

[0122] In one embodiment of the present application, the apparatus further includes a second determining unit, which, before the second obtaining step,

[0123] The second determining unit is used to determine the i =V / qi , determine the current cycle time;

[0124] Among them, the current cycle time is the time required for the current cycle, t i is the current cycle time, V is the total volume of the fuel cell cycle, q i is the current flow rate in the current cycle.

[0125] In one embodiment of the present application, the device further includes a second processing unit, a third processing unit, and a fourth processing unit. After determining the current cycle time, the method further includes:

[0126] The second processing unit is used to repeatedly execute the first acquisition step, the second acquisition step and the processing step when the total cycle time is less than or equal to the time threshold until it is determined that the low temperature start of the fuel cell is successful or the low temperature start fails, and the total cycle time is the total time required for the first cycle to the current cycle to be completed;

[0127] The third processing unit is used to use the total cycle stack heat generation power change curve to derive the time when the total cycle time is greater than the time threshold to obtain a derivative result, and determine that the low temperature start of the fuel cell fails when the derivative result is less than or equal to 0;

[0128] The fourth processing unit is used to repeatedly execute the first acquisition step, the second acquisition step and the processing step when the derivation result is greater than 0, until it is determined that the low-temperature startup of the fuel cell is successful or fails.

[0129] In one embodiment of the present application, the device further includes a fifth processing unit, which, after obtaining the heat generation power of the battery stack and the coolant temperature at the end of the current cycle and obtaining the second heat generation power of the battery stack and the second coolant temperature,

[0130] The fifth processing unit is used to determine that the low-temperature start-up of the fuel cell is successful when the temperature of the second coolant is greater than a preset temperature.

[0131] In one embodiment of the present application, the first acquisition unit includes a fourth determination module.

[0132] The fourth determination module is used to determine the i =I i (U low -U i )×N cell , determine the heat generation power of the first fuel cell stack;

[0133] Among them, P i is the heat generation power of the first stack, N cell is the number of battery cells in the fuel cell, U lowis the potential corresponding to the lower calorific value of hydrogen combustion, at I i When U is the current required for the fuel cell to generate heat by itself, i is the average value of the fuel cell voltage in the current cycle, i In the case of the voltage required for the fuel cell to generate heat by itself, I i is the average value of the fuel cell current in the current cycle.

[0134] The low temperature starting device of the fuel cell includes a processor and a memory, wherein the first determination unit, the first acquisition unit, the second acquisition unit and the first processing unit are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The above modules are all located in the same processor; or, the above modules are located in different processors in any combination.

[0135] The processor includes a kernel, and the kernel retrieves the corresponding program unit from the memory. One or more kernels can be set, and the kernel parameters are adjusted to solve the problem that most existing solutions improve the success rate of low-temperature startup of fuel cells by adjusting pressure, but the pressure has a low influence on the success rate of low-temperature startup of fuel cells, so the success rate of low-temperature startup of fuel cells in the existing solutions is low.

[0136] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0137] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, a device where the computer-readable storage medium is located is controlled to execute a low-temperature startup method for a fuel cell.

[0138] An embodiment of the present invention provides a processor, which is used to run a program, wherein the low-temperature startup method of a fuel cell is executed when the program is run.

[0139] The embodiment of the present invention provides a device, the device includes a processor, a memory and a program stored in the memory and can be run on the processor, and the processor implements at least the following steps when executing the program: a determination step: determining that the current flow is the minimum flow of the coolant; a first acquisition step: using the current flow to drive the fuel cell to start at low temperature, and obtaining the heat generation power of the stack and the coolant temperature at the start time of the current cycle, and obtaining the first heat generation power of the stack and the first coolant temperature; a second acquisition step: obtaining the heat generation power of the stack and the coolant temperature at the end time of the current cycle, obtaining the second heat generation power of the stack and the second coolant temperature, and determining the current adjustment flow according to the first heat generation power of the stack, the first coolant temperature, the second heat generation power of the stack and the second coolant temperature; a processing step: when the second coolant temperature is less than or equal to the preset temperature, updating the current flow to the sum of the current flow and the current adjustment flow, and repeating the first acquisition step, the second acquisition step and the processing step until it is determined that the low temperature start of the fuel cell is successful, or the low temperature start fails. The device in this article can be a server, a PC, a PAD, a mobile phone, etc.

[0140] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with at least the following method steps: a determination step: determining that the current flow rate is the minimum flow rate of the coolant; a first acquisition step: using the current flow rate to drive the fuel cell for low-temperature start-up, and obtaining the heat generation power of the battery stack and the coolant temperature at the start time of the current cycle, and obtaining the first heat generation power of the battery stack and the first coolant temperature; a second acquisition step: obtaining the heat generation power of the battery stack and the coolant temperature at the end time of the current cycle, and obtaining the second heat generation power of the battery stack and the second coolant temperature, and determining the current regulated flow rate based on the first heat generation power of the battery stack, the first coolant temperature, the second heat generation power of the battery stack and the second coolant temperature; a processing step: when the second coolant temperature is less than or equal to the preset temperature, updating the current flow rate to the sum of the current flow rate and the current regulated flow rate, and repeating the first acquisition step, the second acquisition step and the processing step until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails.

[0141] The present application also provides a low-temperature start-up system for a fuel cell, the system comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by one or more processors, and the one or more programs include a method for executing any one of the methods. The fuel cell is driven to start at low temperature by using the current flow rate, and the heat generation power of the stack and the coolant temperature at the start time of the current cycle are obtained to obtain the first heat generation power of the stack and the first coolant temperature; the heat generation power of the stack and the coolant temperature at the end time of the current cycle are obtained to obtain the second heat generation power of the stack and the second coolant temperature, and the current regulated flow rate is determined according to the first heat generation power of the stack, the first coolant temperature, the second heat generation power of the stack and the second coolant temperature; when the second coolant temperature is less than or equal to the preset temperature, the current flow rate is updated to the sum of the current flow rate and the current regulated flow rate, and the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low temperature start of the fuel cell is successful or the low temperature start fails, and the coolant flow rate change is determined based on the heat generation power change and the temperature difference change, so as to ensure the heating rate and avoid the risk of stack burning, and improve the success rate of low temperature start compared with the existing scheme of adjusting pressure, and solve the problem that most of the existing schemes improve the success rate of low temperature start of the fuel cell by adjusting pressure, but the influence of pressure on the success rate of low temperature start of the fuel cell is low, so that the success rate of low temperature start of the fuel cell of the existing scheme is low.

[0142] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0143] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0144] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0145] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0146] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0147] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0148] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0149] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0150] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0151] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0152] 1) The low-temperature start method of the fuel cell of the present application adopts the current flow rate to drive the fuel cell to start at a low temperature, and obtains the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle to obtain the first heat generation power of the fuel cell stack and the first coolant temperature; obtains the heat generation power of the fuel cell stack and the coolant temperature at the end time of the current cycle to obtain the second heat generation power of the fuel cell stack and the second coolant temperature, and determines the current regulated flow rate according to the first heat generation power of the fuel cell stack, the first coolant temperature, the second heat generation power of the fuel cell stack and the second coolant temperature; when the second coolant temperature is less than or equal to the preset temperature, the current flow rate is updated to the current flow rate and the current flow rate. The sum of the pre-adjusted flow rates is calculated, and the first acquisition step, the second acquisition step and the processing step are repeatedly executed until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails. The change in coolant flow rate is determined based on the change in heat generation power and the change in temperature difference, which not only ensures the heating rate but also avoids the risk of stack burning. Compared with the existing scheme of adjusting pressure, the success rate of low-temperature start-up is improved, and the problem that most of the existing schemes improve the success rate of low-temperature start-up of fuel cells by adjusting pressure, but the influence of pressure on the success rate of low-temperature start-up of fuel cells is relatively low, thereby making the success rate of low-temperature start-up of fuel cells in the existing schemes low.

[0153] 2) The low-temperature starting device of the fuel cell of the present application uses the current flow rate to drive the fuel cell to start at a low temperature, and obtains the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle to obtain the first heat generation power of the fuel cell stack and the first coolant temperature; obtains the heat generation power of the fuel cell stack and the coolant temperature at the end time of the current cycle to obtain the second heat generation power of the fuel cell stack and the second coolant temperature, and determines the current regulated flow rate according to the first heat generation power of the fuel cell stack, the first coolant temperature, the second heat generation power of the fuel cell stack and the second coolant temperature; when the second coolant temperature is less than or equal to the preset temperature, the current flow rate is updated to the current flow rate and the current flow rate. The sum of the pre-adjusted flow rates is calculated, and the first acquisition step, the second acquisition step and the processing step are repeatedly executed until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails. The change in coolant flow rate is determined based on the change in heat generation power and the change in temperature difference, which not only ensures the heating rate but also avoids the risk of stack burning. Compared with the existing scheme of adjusting pressure, the success rate of low-temperature start-up is improved, and the problem that most of the existing schemes improve the success rate of low-temperature start-up of fuel cells by adjusting pressure, but the influence of pressure on the success rate of low-temperature start-up of fuel cells is relatively low, thereby making the success rate of low-temperature start-up of fuel cells in the existing schemes low.

[0154] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low temperature start-up method for a fuel cell, characterized in that: include: Determining steps: determining that the current flow rate is the minimum flow rate of the coolant; The first acquisition step: using the current flow rate to drive the fuel cell to start at low temperature, and obtaining the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle, to obtain the first heat generation power of the fuel cell stack and the first coolant temperature; A second acquisition step: acquiring the heat generation power of the battery stack and the coolant temperature at the end of the current cycle, obtaining a second heat generation power of the battery stack and a second coolant temperature, and determining a current regulation flow rate according to the heat generation power of the first battery stack, the first coolant temperature, the second heat generation power of the battery stack and the second coolant temperature; Processing steps: When the second coolant temperature is less than or equal to the preset temperature, the current flow rate is updated to the sum of the current flow rate and the current adjusted flow rate, and the first acquisition step, the second acquisition step and the processing step are repeated until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails.

2. The method according to claim 1, characterized in that Determining a current regulating flow rate according to the first stack heat generation power, the first coolant temperature, the second stack heat generation power, and the second coolant temperature includes: Determine the current cycle power change as the difference between the heat generation power of the second fuel cell stack and the heat generation power of the first fuel cell stack; Determine the current cycle temperature change as the difference between the second coolant temperature and the first coolant temperature; The current regulated flow rate is determined according to the current cycle power change and the current cycle temperature change.

3. The method according to claim 2, characterized in that Determining the current regulated flow rate according to the current cycle power variation and the current cycle temperature variation includes: According to Δq=ΔP / C p ρΔT, determining the current regulated flow rate; Wherein, Δq is the current regulated flow, ΔP is the current cycle power change, C p is the constant pressure specific heat capacity, ρ is the coolant density, and ΔT is the temperature change of the current cycle.

4. The method according to claim 1, characterized in that: Before the second obtaining step, the method further comprises: According to t i =V / q i , determine the current cycle time; The current cycle time is the time required for the current cycle, t i is the current cycle time, V is the total volume of the fuel cell circulation loop, q i is the current flow rate in the current cycle.

5. The method according to claim 4, characterized in that After determining the current cycle time, the method further includes: When the total cycle time is less than or equal to the time threshold, the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low-temperature startup of the fuel cell is successful or fails, and the total cycle time is the total time required for the first cycle to the current cycle to be completed; When the total cycle time is greater than the time threshold, the total cycle stack heat generation power change curve is used to derive the time to obtain a derivative result, and when the derivative result is less than or equal to 0, it is determined that the low temperature start of the fuel cell has failed; When the derivation result is greater than 0, the first acquisition step, the second acquisition step and the processing step are repeatedly performed until it is determined that the low-temperature startup of the fuel cell succeeds or fails.

6. The method according to claim 1, characterized in that After acquiring the heat generation power of the battery stack and the coolant temperature at the end time of the current cycle and obtaining the second heat generation power of the battery stack and the second coolant temperature, the method further includes: When the second coolant temperature is greater than the preset temperature, it is determined that the low temperature start-up of the fuel cell is successful.

7. The method according to any one of claims 1 to 6, characterized in that Obtaining the heat generation power of the battery stack and the coolant temperature at the start time of the current cycle to obtain the first heat generation power of the battery stack includes: According to P i =I i (U low -U i )×N cell , determining the heat generation power of the first fuel cell stack; Among them, P i is the heat generation power of the first stack, N cell is the number of battery cells in the fuel cell, U low is the potential corresponding to the lower calorific value of hydrogen combustion, at I i In the case of the current required for the fuel cell to generate heat by itself, U i is the average value of the voltage of the fuel cell within the current cycle, i In the case of the voltage required for the fuel cell to generate heat by itself, I i is the average value of the current of the fuel cell in the current cycle.

8. A low temperature starting device for a fuel cell, characterized in that: include: A first determining unit is used to perform a determining step: determining that a current flow rate is a minimum flow rate of the coolant; A first acquisition unit is used to perform a first acquisition step: using the current flow rate to drive the fuel cell to start at low temperature, and acquiring the heat generation power of the fuel cell stack and the coolant temperature at the start time of the current cycle, to obtain a first heat generation power of the fuel cell stack and a first coolant temperature; A second acquisition unit is used to perform a second acquisition step: acquiring the heat generation power of the battery stack and the coolant temperature at the end time of the current cycle, obtaining a second heat generation power of the battery stack and a second coolant temperature, and determining a current regulation flow rate according to the first heat generation power of the battery stack, the first coolant temperature, the second heat generation power of the battery stack and the second coolant temperature; The first processing unit is used to execute a processing step: when the second coolant temperature is less than or equal to a preset temperature, the current flow rate is updated to the sum of the current flow rate and the current regulated flow rate, and the first acquisition step, the second acquisition step and the processing step are repeatedly executed to improve the success rate of the low-temperature start-up of the fuel cell, until it is determined that the low-temperature start-up of the fuel cell is successful, or the low-temperature start-up fails.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

10. A low temperature start-up system for a fuel cell, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 7.

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