Cold start control method and device of fuel cell system

Abstract

The invention provides a cold start control method and device of a fuel cell system, and relates to the technical field of fuel cell system control, and the method comprises the following steps: heating a first cooling liquid in a first channel of the fuel cell system through a first heat source, and heating a second cooling liquid in a second channel of the fuel cell system through a second heat source; converging the first cooling liquid and the second cooling liquid which are subjected to heating treatment, and jointly providing heat for cold start of a first electric pile in the fuel cell system; and when the first electric pile reaches a preset target temperature, controlling the first cooling liquid and the second cooling liquid flowing through the first electric pile to provide heat for cold start of a second electric pile in the fuel cell system so as to relieve the technical problem of icing of a double-pile structure of the high-power fuel cell system at a low temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell system control, and particularly to a cold start control method and device for a fuel cell system. Background Art

[0002] In the cold winter, limited by the system architecture and product performance, the fuel cell often fails to start during the cold start process.

[0003] Currently, when solving the problem of cold start of high-power fuel cell systems at low temperatures in the fuel cell industry, it is generally improved through special designs of products alone, which requires a large amount of cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a cold start control method and device for a fuel cell system. By preferentially starting one stack with concentrated heat from two heat sources, when this stack reaches the target start temperature, the heat is then distributed to the other stack, so as to alleviate the technical problem of ice formation in the dual-stack structure of high-power fuel cell systems at low temperatures.

[0005] In a first aspect, an embodiment of the present invention provides a cold start control method for a fuel cell system, including:

[0006] Heating the first coolant in the first channel of the fuel cell system through a first heat source, and heating the second coolant in the second channel of the fuel cell system through a second heat source;

[0007] Mixing the heated first coolant and second coolant to jointly provide heat for the cold start of the first stack in the fuel cell system;

[0008] When the first stack reaches the preset target temperature, controlling the first coolant and second coolant flowing through the first stack to provide heat for the cold start of the second stack in the fuel cell system.

[0009] Combined with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the step of heating the first coolant in the first channel of the fuel cell system through a first heat source and heating the second coolant in the second channel of the fuel cell system through a second heat source includes:

[0010] Heating the first coolant in the first channel on the water side of the fuel cell system through the first heat source provided in the first channel on the water side of the fuel cell system;

[0011] Heating the second coolant in the second channel on the water side of the fuel cell system through the second heat source provided on the air side of the fuel cell system.

[0012] In combination with the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect. Among them, the first heat source includes a heater, and the second heat source includes an air compressor and a back pressure valve; the air compressor increases the rotational speed and closes the back pressure valve, converts the recovered pressure energy into temperature energy, and transfers it to an intercooler provided in the second channel to heat the second coolant in the intercooler.

[0013] In combination with the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect. Among them, the step of combining the first coolant and the second coolant after heat treatment to jointly provide heat for the cold start of the first fuel cell stack in the fuel cell system includes:

[0014] Through the cooperation of the first bypass valve and the second bypass valve, the first channel and the second channel are connected in parallel and then connected in series with the first fuel cell stack;

[0015] Under the action of a water pump on the water side of the fuel cell system, control the first coolant after heat treatment in the first channel and the second coolant after heat treatment in the second channel to flow into the first fuel cell stack, so that the first fuel cell stack performs a cold start operation.

[0016] In combination with the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect. Among them, the first end of the first bypass valve is respectively connected to one end of the second channel and one end of the first fuel cell stack, and the second end of the first bypass valve is connected to one end of the first channel; the first end of the second bypass valve is respectively connected to the other end of the first channel and the other end of the second channel, and the second end of the second bypass valve is connected to the other end of the first fuel cell stack;

[0017] Before the step of controlling the first coolant after heat treatment in the first channel and the second coolant after heat treatment in the second channel to flow into the first fuel cell stack under the action of the water pump on the water side, so that the first fuel cell stack performs a cold start operation, the method further includes:

[0018] Control the first end and the second end of the first bypass valve to conduct, and control the first end and the second end of the second bypass valve to conduct.

[0019] In combination with the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect. Among them, one end of the second fuel cell stack is connected to the first end of the first bypass valve, and the other end of the second fuel cell stack is connected to the third end of the second bypass valve;

[0020] When the first stack reaches a preset target temperature, the step of controlling the first coolant and the second coolant flowing through the first stack to provide heat for the cold start of the second stack in the fuel cell system includes:

[0021] When the first stack reaches a preset target temperature, control the third end of the second bypass valve to conduct, so that the first coolant and the second coolant flow into the second stack to provide heat for the cold start of the second stack.

[0022] Combined with the first aspect, the embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the method further includes:

[0023] Control the opening degrees of the second end and the third end of the second bypass valve respectively, so that the coolants flowing into the first stack and the second stack reach a preset target ratio.

[0024] In a second aspect, the embodiment of the present invention further provides a cold start control device for a fuel cell system, including:

[0025] A heating module that heats the first coolant in the first channel of the fuel cell system through a first heat source and heats the second coolant in the second channel of the fuel cell system through a second heat source;

[0026] A first cold start module that combines the heated first coolant and second coolant to jointly provide heat for the cold start of the first stack in the fuel cell system;

[0027] A second cold start module that, when the first stack reaches a preset target temperature, controls the first coolant and the second coolant flowing through the first stack to provide heat for the cold start of the second stack in the fuel cell system.

[0028] In a third aspect, an embodiment provides an electronic device, including a memory and a processor. A computer program that can run on the processor is stored in the memory. When the processor executes the computer program, the steps of the method described in any one of the foregoing embodiments are implemented.

[0029] In a fourth aspect, an embodiment provides a machine-readable storage medium. The machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to implement the steps of the method described in any one of the foregoing embodiments.

[0030] An embodiment of the present invention provides a cold start control method and device for a fuel cell system. The coolant in two channels of the fuel cell system is heated by two heat sources respectively, and then the coolant heated by the two heat sources is converged, so that the dual heat jointly provides heat for the cold start of the first stack of the fuel cell system. When the first stack reaches a preset target temperature at which it can be quickly cold-started, the dual heat of the coolant is distributed to the first stack and the second stack to help the second stack quickly cold-start, which can not only ensure the quick start of the system at low temperature, but also ensure the life and durability of the stack.

[0031] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structure specifically pointed out in the specification and the drawings.

[0032] To make the above objectives, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, is described in detail as follows. Description of the Drawings

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a flowchart of a cold start control method for a fuel cell system provided by an embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the architecture principle of applying a cold start control method for a fuel cell system provided by an embodiment of the present invention;

[0036] Figure 3 It is a schematic diagram of the application principle of a cold start control method for a fuel cell system provided by an embodiment of the present invention;

[0037] Figure 4 It is a schematic diagram of the application principle of another cold start control method for a fuel cell system provided by an embodiment of the present invention;

[0038] Figure 5 It is a schematic diagram of the functional modules of a cold start control device for a fuel cell system provided by an embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of the hardware architecture of an electronic device provided by an embodiment of the present invention. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Currently, when problems occur during the cold start of the system, the problem of ice formation in the fuel cell system at low temperatures is generally solved through the special design of the product alone, which will consume a large amount of R & D resources and verification resources, and the effect is not ideal. It can only improve the problems of individual products or single stacks, and cannot solve the systematic problems. Moreover, for high-power fuel cell systems, a large amount of heat is required, and the cold start-up time is relatively long, which will cause an increase in hydrogen loss. When the temperature drops to -30°C and below, the system cannot be fully started through the special design of the product alone, resulting in system failures that require a lot of effort to repair, causing customer complaints.

[0042] Based on this, a cold start control method and device for a fuel cell system provided by the embodiments of the present invention can solve the problem of ice formation in the double-stack structure of high-power fuel cell systems at low temperatures through systematic comprehensive layout and heat flow distribution strategies.

[0043] To facilitate the understanding of this embodiment, first, a cold start control method for a fuel cell system disclosed in the embodiments of the present invention will be introduced in detail. This method can be applied in a fuel cell system controller.

[0044] Figure 1 It is a flowchart of a cold start control method for a fuel cell system provided by an embodiment of the present invention.

[0045] Referring to Figure 1 , the cold start control method for the fuel cell system includes the following steps:

[0046] Step S102, heating the first coolant in the first channel of the fuel cell system through a first heat source, and heating the second coolant in the second channel of the fuel cell system through a second heat source.

[0047] It can be understood that some channels in the fuel cell system may have coolant flowing through to facilitate corresponding thermal management operations such as refrigeration or heating for the stack in the fuel cell system. Among them, the heat source can be understood as a device for heating the coolant, such as a PTC heater.

[0048] Step S104: Converge the first coolant and the second coolant after heat treatment to jointly provide heat for the cold start of the first stack in the fuel cell system.

[0049] Here, the dual heat of the first coolant and the second coolant heated by two heat sources respectively converges to jointly heat the first stack, so that the first stack can achieve cold start faster. It should be noted that the cold start efficiency of the stack is related to the ambient temperature of the stack. That is, if the ambient temperature of the stack increases, the cold start efficiency of the stack can be increased.

[0050] Step S106: When the first stack reaches the preset target temperature, control the first coolant and the second coolant flowing through the first stack to provide heat for the cold start of the second stack in the fuel cell system.

[0051] Here, the preset target temperature can be understood as the stack temperature corresponding to successful cold start of the stack, such as 4°C, 5°C, and 6°C, preferably 5°C; it can be understood that when the first stack is under the action of coolant flow and the temperature of the stack reaches above 5°C, that is, the first stack achieves rapid cold start. And the stack temperature is the temperature of the coolant at the stack outlet detected by the temperature sensor set at the stack outlet, that is, the stack temperature is characterized by the temperature of the coolant at the stack outlet.

[0052] In a preferred embodiment of practical application, the coolants in two channels of the fuel cell system are heated by two heat sources respectively, and then the coolants heated by the two heat sources are converged, so that this dual heat jointly provides heat for the cold start of the first stack in the fuel cell system; when the first stack reaches the preset target temperature at which it can start quickly, the dual heat of the coolant is distributed to the first stack and the second stack. That is, when the coolant flows into the stack, it flows into both the first stack and the second stack to help the second stack start quickly, which can not only ensure the rapid start of the system at low temperature, but also ensure the life and durability of the stack.

[0053] In some embodiments, the schematic diagram of the architecture of the cold start control method of the fuel cell system is as Figure 2 shown. The architecture includes the following components: overflow tank TNK, cooling fan, first bypass valve (such as cooling bypass valve CBV - Coolant By - pass Valve), heater (CHTR - Coolant Heater), air inter cooler (AIC - Air Inter Cooler), coolant water pump (CWP - Coolant Water Pump), second bypass valve, air compressor (ACM - Air Compressor), air back pressure valve (ABPV: Air Back Pressure Valve), first stack and second stack;

[0054] The water side of the architecture includes an overflow tank, a cooling fan, a first bypass valve, a heater, and an intercooler, and the air side includes an air compressor and a back pressure valve;

[0055] The first end 3 of the first bypass valve is respectively connected to one end of the intercooler in the second channel, one end of the first fuel cell stack, and one end of the second fuel cell stack, and the second end 4 of the first bypass valve is connected to one end of the heater in the first channel; the third end 2 of the first bypass valve is connected to one end of the cooling fan;

[0056] The first end 5 of the second bypass valve is respectively connected to the other end of the cooling fan, the other end of the heater in the first channel, and the other end of the intercooler in the second channel, the second end 6 of the second bypass valve is connected to the other end of the first fuel cell stack, and the third end 7 of the second bypass valve is connected to the other end of the second fuel cell stack;

[0057] Wherein, a water pump is arranged between the first end 5 of the second bypass valve and the other end of the intercooler, and the water pump is used to pump the coolant in the first channel and the second channel into the first fuel cell stack and / or the second fuel cell stack; the overflow tank is used to store and supply the fuel cell coolant; the cooling fan is used to dissipate heat from the coolant on the water side; the heater (such as a PTC electric heater) can be used as the first heat source to heat the first coolant in the first channel; the bypass valve is used to adjust the flow distribution of the coolant in the cooling circuit and control the temperature of the coolant entering the fuel cell stack inlet; the air compressor is equipped with an expander, and the air compressor is used to provide air with different flow rates and pressures, and the expander can recover pressure energy; the outlet of the expander of the air compressor is connected to the intercooler, and the intercooler is used to cool the air at the outlet of the air compressor, recover energy, and meet the air inlet temperature requirement of the fuel cell stack; the back pressure valve is used to adjust the pressure at different power points on the cathode side of the fuel cell through the opening degree. The first bypass valve can be a three-way valve or a four-way valve, and the second bypass valve can be a three-way valve. The second bypass valve is, for example Figure 2 a three-way valve connected between the water pump and the first fuel cell stack and the second fuel cell stack.

[0058] In practical applications, the cold start control method of the fuel cell system provided by the embodiment of the present invention may include a first cold start stage for the first fuel cell stack and a second cold start stage for the second fuel cell stack;

[0059] For the first cold start stage, first, the coolant in the two channels is heated by two heat sources respectively:

[0060] Specifically, the first heat source arranged in the first channel on the water side of the fuel cell system is used to heat the first coolant in the first channel on the water side; the second heat source arranged on the air side of the fuel cell system is used to heat the second coolant in the second channel on the water side of the fuel cell system.

[0061] It should be noted that, such asFigure 3 As shown, where the thick black line is the coolant flow path; at this time, the third ends 2 of the first bypass valve and 7 of the second bypass valve are in the closed state; the first heat source is a heater, and the second heat source includes an air compressor and a back pressure valve; the air compressor increases its speed and closes the back pressure valve, recovering and converting the pressure energy into temperature energy and transferring it to the intercooler provided in the second channel to heat the second coolant in the intercooler.

[0062] Secondly, the coolants heated in the two channels are combined, and the dual heat is used together to supply heat for the cold start of the first fuel cell stack, so that the cold start can be achieved quickly.

[0063] Specifically, through the cooperation of the first bypass valve and the second bypass valve, the first channel and the second channel are connected in parallel and then in series with the first fuel cell stack, that is, the heater and the intercooler are connected in parallel and then in series with the first fuel cell stack and the second fuel cell stack; control the first end 3 and the second end 4 of the first bypass valve to conduct, and control the first end 5 and the second end 6 of the second bypass valve to conduct. Then, under the action of the water pump on the water side of the fuel cell system, it is possible to control the first coolant after heat treatment in the first channel and the second coolant after heat treatment in the second channel to flow into the first fuel cell stack, so that the first fuel cell stack performs a cold start operation; at this time, the first fuel cell stack reaches the target temperature, that is, the first fuel cell stack realizes the cold start operation in the first stage, and at this time, the cold start operation in the second stage is performed.

[0064] For the second stage of this cold start, as Figure 4 shown, where the thick black line is the coolant flow path; control the third end 7 of the second bypass valve to also conduct, so that the first coolant and the second coolant can flow into the second fuel cell stack in addition to flowing into the first fuel cell stack, supplying heat for the cold start of the second fuel cell stack. At this time, if the second fuel cell stack also reaches the preset target temperature, that is, the coolant temperature corresponding to the outlet of the second fuel cell stack also reaches the preset target temperature, the second fuel cell stack also realizes cold start.

[0065] As an optional embodiment, the heat of the coolant is preferentially concentrated and distributed to the first fuel cell stack, and after the cold start of the first fuel cell stack, the heat of the coolant is also distributed to the second fuel cell stack. The heat of the coolant is transferred as the coolant flows through the process, and the distribution of the coolant flow rate in the second stage of the cold start further includes:

[0066] Respectively control the opening degrees of the second end and the third end of the second bypass valve so that the coolants flowing into the first fuel cell stack and the second fuel cell stack reach a preset target ratio.

[0067] Among them, the preset target ratio can be defined by the actual calibration value. For example, 30% of the coolant flow rate flows into the first fuel cell stack and 70% of the coolant flow rate flows into the second fuel cell stack to realize the cold start operation in the second stage.

[0068] In the embodiments of the present invention, a single stack is preferentially started mainly through double heat concentration on the air path side and the water path side, so that a single stack can ensure the system startup. When the temperature reaches the cold startup standard, the heat is also distributed to the other stack, enabling the fuel cell system to make the whole vehicle operate normally at low temperature.

[0069] As Figure 5 shown, the embodiments of the present invention provide a cold startup control device for a fuel cell system, including:

[0070] A heating module that heats the first coolant in the first channel of the fuel cell system through a first heat source and heats the second coolant in the second channel of the fuel cell system through a second heat source;

[0071] A first cold startup module that converges the heated first coolant and the second coolant to jointly provide heat for the cold startup of the first stack in the fuel cell system;

[0072] A second cold startup module that, when the first stack reaches a preset target temperature, controls the first coolant and the second coolant flowing through the first stack to provide heat for the cold startup of the second stack in the fuel cell system.

[0073] In some embodiments, the heating module is further specifically configured to heat the first coolant in the first channel on the water path side of the fuel cell system through the first heat source provided in the first channel; and heat the second coolant in the second channel on the water path side of the fuel cell system through the second heat source provided on the air path side of the fuel cell system.

[0074] In some embodiments, the first heat source includes a heater, and the second heat source includes an air compressor and a back pressure valve; the air compressor increases the rotational speed and closes the back pressure valve, converts the recovered pressure energy into temperature energy and transfers it to the intercooler provided in the second channel to heat the second coolant in the intercooler.

[0075] In some embodiments, the first cold startup module is further specifically configured to, through the cooperation of a first bypass valve and a second bypass valve, connect the first channel and the second channel in parallel and then connect them in series with the first stack; under the action of a water pump on the water path side of the fuel cell system, control the heated first coolant in the first channel and the heated second coolant in the second channel to flow into the first stack, so that the first stack performs a cold startup operation.

[0076] In some embodiments, a first end of the first bypass valve is respectively connected to one end of the second channel and one end of the first stack, and a second end of the first bypass valve is connected to one end of the first channel; a first end of the second bypass valve is respectively connected to the other end of the first channel and the other end of the second channel, and a second end of the second bypass valve is connected to the other end of the first stack; before the step of controlling the first coolant after heat treatment in the first channel and the second coolant after heat treatment in the second channel to flow into the first stack under the action of a water pump on the water path side to enable the first stack to perform a cold start operation, the device is further configured to control the first end and the second end of the first bypass valve to be conducted, and control the first end and the second end of the second bypass valve to be conducted.

[0077] In some embodiments, one end of the second stack is connected to the first end of the first bypass valve, and the other end of the second stack is connected to the third end of the second bypass valve; the second cold start module is further specifically configured to, when the temperature of the first stack reaches a preset target temperature, control the third end of the second bypass valve to be conducted, so that the first coolant and the second coolant flow into the second stack to supply heat for cold start of the second stack.

[0078] In some embodiments, the device is further specifically configured to respectively control the opening degrees of the second end and the third end of the second bypass valve, so that the coolants flowing into the first stack and the second stack reach a preset target ratio.

[0079] The embodiments of the present invention provide an electronic device for implementation. In this embodiment, the electronic device may be, but is not limited to, a computer device with analysis and processing capabilities such as a personal computer (PC), a laptop computer, a monitoring device, a server, etc.

[0080] As an exemplary embodiment, reference may be made to Figure 6 , the electronic device 110 includes a communication interface 111, a processor 112, a memory 113, and a bus 114, and the processor 112, the communication interface 111, and the memory 113 are connected through the bus 114; the memory 113 is used to store a computer program that supports the processor 112 to execute the above method, and the processor 112 is configured to execute the program stored in the memory 113.

[0081] The machine-readable storage medium mentioned in this document can be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and so on. For example, the machine-readable storage medium can be: RAM (Random Access Memory), volatile memory, non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar storage media, or a combination thereof.

[0082] The non-volatile medium can be non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar non-volatile storage media, or a combination thereof.

[0083] It can be understood that the specific operation methods of the functional modules in this embodiment can refer to the detailed descriptions of the corresponding steps in the above method embodiment, and will not be repeated here.

[0084] The computer-readable storage medium provided by the embodiment of the present invention stores a computer program, and when the computer program code is executed, it can implement the method described in any of the above embodiments. For the specific implementation, refer to the method embodiment and will not be elaborated here.

[0085] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0086] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0087] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0088] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the technical field of the present invention can still modify the technical solutions recorded in the foregoing embodiments or easily conceive of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A cold start control method for a fuel cell system, characterized in that, comprising: heating the first coolant in the first channel of the fuel cell system by a first heat source, and heating the second coolant in the second channel of the fuel cell system by a second heat source; converging the heated first coolant and second coolant to jointly provide heat for cold start of the first stack in the fuel cell system; when the first stack reaches a preset target temperature, controlling the first coolant and second coolant flowing through the first stack to provide heat for cold start of the second stack in the fuel cell system.

2. The method according to claim 1, characterized in that, the step of heating the first coolant in the first channel of the fuel cell system by a first heat source and heating the second coolant in the second channel of the fuel cell system by a second heat source includes: heating the first coolant in the first channel on the water side of the fuel cell system by the first heat source provided in the first channel on the water side; heating the second coolant in the second channel on the water side of the fuel cell system by the second heat source provided on the air side of the fuel cell system.

3. The method according to claim 2, characterized in that, the first heat source includes a heater, and the second heat source includes an air compressor and a back pressure valve; the air compressor increases the rotational speed and closes the back pressure valve, recovering and converting the pressure energy into temperature energy and transmitting it to the intercooler provided in the second channel to heat the second coolant in the intercooler.

4. The method according to claim 1, characterized in that, the step of converging the heated first coolant and second coolant to jointly provide heat for cold start of the first stack in the fuel cell system includes: through the cooperation of a first bypass valve and a second bypass valve, connecting the first channel and the second channel in parallel and then connecting them in series with the first stack; under the action of a water pump on the water side of the fuel cell system, controlling the heated first coolant in the first channel and the heated second coolant in the second channel to flow into the first stack, so that the first stack performs a cold start operation.

5. The method according to claim 4, characterized in that, the first end of the first bypass valve is respectively connected to one end of the second channel and one end of the first stack, and the second end of the first bypass valve is connected to one end of the first channel; the first end of the second bypass valve is respectively connected to the other end of the first channel and the other end of the second channel, and the second end of the second bypass valve is connected to the other end of the first stack; before the step of controlling the heated first coolant in the first channel and the heated second coolant in the second channel to flow into the first stack under the action of the water pump on the water side, so that the first stack performs a cold start operation, the method further includes: controlling the first end and the second end of the first bypass valve to be conducted, and controlling the first end and the second end of the second bypass valve to be conducted.

6. The method according to claim 5, It is characterized in that One end of the second battery stack is connected to the first end of the first bypass valve, and the other end of the second battery stack is connected to the third end of the second bypass valve; When the first stack reaches a preset target temperature, the step of controlling the first coolant and the second coolant flowing through the first stack to provide heat for the cold start of the second stack in the fuel cell system comprises: When the first fuel cell stack reaches a preset target temperature, the third end of the second bypass valve is controlled to be open so that the first coolant and the second coolant flow into the second fuel cell stack to provide heat for the cold start of the second fuel cell stack.

7. The method according to claim 6, It is characterized in that The method further comprises: The openings of the second end and the third end of the second bypass valve are controlled respectively so that the coolant flowing into the first fuel cell stack and the second fuel cell stack reaches a preset target ratio.

8. A cold start control device for a fuel cell system, It is characterized in that include: A heating module, heating a first coolant in a first channel of the fuel cell system through a first heat source, and heating a second coolant in a second channel of the fuel cell system through a second heat source; a first cold start module, which combines the first coolant and the second coolant after the heating process to jointly provide heat for the cold start of the first stack in the fuel cell system; The second cold start module controls the first coolant and the second coolant flowing through the first stack to provide heat for the cold start of the second stack in the fuel cell system when the first stack reaches a preset target temperature.

9. An electronic device, It is characterized in that The method comprises a memory, a processor, and a program stored in the memory and capable of being run on the processor, wherein the processor implements the method according to any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, It is characterized in that The readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

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