Double-stack fuel cell system and thermal management control method thereof

Abstract

The invention discloses a double-stack fuel cell system. Comprising a first fuel cell stack, a second fuel cell stack and a hydrogen supply system for supplying hydrogen to the first fuel cell stack and the second fuel cell stack, the air supply system is used for providing air for the first fuel cell stack and the second fuel cell stack, and the cooling system is used for providing cooling liquid for the first fuel cell stack and the second fuel cell stack and comprises a three-way valve connected with the first fuel cell stack and the second fuel cell stack. The opening degree of the three-way valve can be adjusted according to the performance conditions of the first fuel cell stack and the second fuel cell stack. According to the double-stack fuel cell system, one system is used for controlling the two fuel cell stacks, different heat dissipation requirements of the two fuel cell stacks can be met, effective control over the two fuel cell stacks is achieved, the arrangement flexibility of the system can be improved, and the cost is remarkably reduced. The invention also discloses a thermal management control method of the double-stack fuel cell system.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular, to a dual-stack fuel cell system and a thermal management control method thereof. Background Art

[0002] As air pollution and greenhouse effect have become increasingly serious in recent years, in response to the call of the "dual carbon policy", finding a sustainable alternative fuel that can also reduce greenhouse gas emissions such as CO2 has become a very promising and valuable research direction. Fuel cells, as an efficient power generation device that is not limited by the Carnot cycle and can convert hydrogen into electricity, have attracted more and more attention.

[0003] A proton exchange membrane fuel cell is a power generation device that converts chemical energy into electrical energy. The main product of a fuel cell is water. However, in a dual-stack fuel cell system, the two stacks will inevitably experience varying degrees of performance degradation after running for a period of time, resulting in different operating conditions and different amounts of heat generated.

[0004] In the prior art, although improvements have been made to the coolant flow distribution of fuel cells, it is not suitable for the coolant flow distribution of dual-stack fuel cell systems. When the dual-stack fuel cell is actually working, the uniform distribution of coolant cannot meet the use requirements for the different temperatures generated by the two stacks, resulting in uneven temperature of the stacks. If the temperature difference is large, the service life and use conditions of the upper and lower stacks will be inconsistent after long-term operation. If two independent systems are used to control the two stacks respectively, the cost and overall volume will be increased, and the flexibility of system layout will be reduced.

[0005] It is desirable to provide an improved dual-stack fuel cell system, particularly with respect to improving coolant flow distribution in the dual-stack fuel cell system. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a dual-stack fuel cell system, the purpose of which is to achieve effective control of two fuel cell stacks and meet the different heat dissipation requirements of the two fuel cell stacks.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dual-stack fuel cell system, including a first fuel cell stack, a second fuel cell stack, a hydrogen supply system for providing hydrogen to the first fuel cell stack and the second fuel cell stack, an air supply system for providing air to the first fuel cell stack and the second fuel cell stack, and a cooling system for providing coolant to the first fuel cell stack and the second fuel cell stack, the cooling system includes a three-way valve connected to the first fuel cell stack and the second fuel cell stack, and the three-way valve is configured to be able to adjust the opening according to the performance of the first fuel cell stack and the second fuel cell stack.

[0008] The cooling system also includes a PTC, a water pump, a thermostat and a radiator assembly. The water pump is connected to the three-way valve and the radiator assembly. The radiator assembly is connected to the thermostat. The thermostat is connected to the first fuel cell stack and the second fuel cell stack. The PTC is connected to the water pump and the thermostat.

[0009] The cooling system further comprises a deionizer, and the deionizer is connected to the water pump and the thermostat.

[0010] The cooling system further includes a particulate filter connected to the radiator assembly and the thermostat and located between the radiator assembly and the thermostat.

[0011] The hydrogen supply system includes a hydrogen tank, an ejector assembly, a hydrogen circulation pump and a gas-water separator. The hydrogen circulation pump is connected to the ejector assembly and the gas-water separator. The ejector assembly is connected to the first fuel cell stack and the second fuel cell stack.

[0012] A proportional valve, a shut-off valve and a pressure reducing valve are arranged between the hydrogen tank and the ejector assembly.

[0013] The gas-water separator is connected to the nitrogen exhaust valve and the water drain valve, the nitrogen exhaust valve and the water drain valve are connected to the tail exhaust mixing pipe, and the tail exhaust mixing pipe is connected to the air supply system.

[0014] The air supply system includes an air compressor and an intercooler connected to each other. The intercooler is connected to the first fuel cell stack and the second fuel cell stack, and the intercooler is connected to the cooling system.

[0015] The air supply system further comprises an air filter and an air mass flow meter, wherein the air mass flow meter is located between the air filter and the air compressor and is connected to the air filter and the air compressor.

[0016] The present invention also provides a thermal management control method for a dual-stack fuel cell system. During the operation of the dual-stack fuel cell system, the three-way valve can adjust the opening according to the performance of the first fuel cell stack and the second fuel cell stack, and then adjust the coolant flow of the first fuel cell stack and the second fuel cell stack, thereby meeting the different heat dissipation requirements of the dual-stack fuel cells.

[0017] The dual-stack fuel cell system of the present invention uses one set of systems to control two fuel cell stacks, which can meet the different heat dissipation requirements of the two fuel cell stacks, achieve effective control of the two fuel cell stacks, improve system layout flexibility, and significantly reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a dual-stack fuel cell system of the present invention;

[0019] The marks in the above figures are: 1. Expansion kettle; 2. Radiator assembly; 3. Three-way valve; 4. First sensor; 5. Particle filter; 6. PTC; 7. Water pump; 8. Deionizer; 9. Water line pressure sensor; 10. Second sensor; 11. Fourth sensor; 12. First fuel cell stack; 13. Third sensor; 14. Fifth sensor; 15. Second fuel cell stack; 16. Hydrogen outlet pressure sensor; 17. Gas-water separator; 18. Hydrogen circulation pump; 19. Ejector assembly; 20. Proportional valve; 21. Shut-off valve; 22. Pressure reducing valve; 23. Hydrogen tank; 24. Muffler; 25. Nitrogen exhaust valve; 26. Tail exhaust mixing pipe; 27. Drainage Valve; 28, hydrogen out-of-stack temperature sensor; 29, second air out-of-stack shut-off valve; 30, second air out-of-stack pressure sensor; 31, hydrogen in-stack pressure sensor; 32, second air in-stack shut-off valve; 33, second air in-stack pressure sensor; 34, hydrogen in-stack temperature sensor; 35, first air out-stack temperature sensor; 36, bypass valve; 37, first air out-stack pressure sensor; 38, air in-stack temperature sensor; 39, first air in-stack shut-off valve; 40, first air in-stack pressure sensor; 41, intercooler; 42, thermostat; 43, air compressor; 44, air mass flow meter; 45, air filter; 46, first air out-stack shut-off valve. DETAILED DESCRIPTION

[0020] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0021] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower" and similar expressions used in this article are for illustrative purposes only.

[0022] It should be noted that, in the following embodiments, the "first", "second", "third", "fourth" and "fifth" do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] like Figure 1 As shown, the present invention provides a dual-stack fuel cell system, including a first fuel cell stack 12, a second fuel cell stack 15, a hydrogen supply system for providing hydrogen to the first fuel cell stack 12 and the second fuel cell stack 15, an air supply system for providing air to the first fuel cell stack 12 and the second fuel cell stack 15, and a cooling system for providing coolant to the first fuel cell stack 12 and the second fuel cell stack 15. The cooling system includes a three-way valve 3 connected to the first fuel cell stack 12 and the second fuel cell stack 15, and the three-way valve 3 is configured to be able to adjust the opening according to the performance of the first fuel cell stack 12 and the second fuel cell stack 15, thereby adjusting the coolant flow of the first fuel cell stack 12 and the second fuel cell stack 15, so that the coolant flow of the first fuel cell stack 12 and the second fuel cell stack 15 is the same or different.

[0025] Specifically, if Figure 1 As shown, the cooling system further includes a PTC 6, a particle filter 5, a deionizer 8, a water pump 7, a thermostat 42 and a radiator assembly 2. The water pump 7 is connected to the three-way valve 3 and the radiator assembly 2, and the water pump 7 is located between the three-way valve 3 and the radiator assembly 2. The radiator assembly 2 is connected to the thermostat 42, the thermostat 42 is connected to the first fuel cell stack 12 and the second fuel cell stack 15, the PTC 6 is connected to the water pump 7 and the thermostat 42, the deionizer 8 is connected to the water pump 7 and the thermostat 42, the particle filter 5 is connected to the radiator assembly 2 and the thermostat 42, and the particle filter 5 is located between the radiator assembly 2 and the thermostat 42.

[0026] like Figure 1 As shown, the cooling system can form a small cooling water circulation loop that does not flow through the radiator assembly 2 and a large cooling water circulation loop that flows through the radiator assembly 2. One end of the water pump 7 is connected to the water outlet of the three-way valve 3, the other end of the water pump 7 is connected to one end of the radiator assembly 2, the other end of the radiator assembly 2 is connected to one end of the particle filter 5, and the other end of the particle filter 5 is connected to the first water inlet of the thermostat 42. One end of the PTC 6 is connected to the pipeline connecting the water pump 7 and the radiator assembly 2, the other end of the PTC 6 is connected to the second water inlet of the thermostat 42, the second water inlet of the thermostat 42 is connected to the water pump 7, and the water outlet of the thermostat 42 is connected to the water inlet of the first fuel cell stack 12 and the water inlet of the second fuel cell stack 15. One end of the deionizer 8 is connected to the pipeline connecting the water pump 7 and the three-way valve 3, and the other end of the deionizer 8 is connected to the water outlet of the thermostat.

[0027] like Figure 1 As shown, the first water inlet of the three-way valve 3 is connected to the water outlet of the first fuel cell stack 12, and the second water inlet of the three-way valve 3 is connected to the water outlet of the second fuel cell stack 15. The three-way valve 3 is a solenoid valve, and the first water inlet and the second water inlet of the three-way valve 3 are connected to the water outlet. When the power of the first fuel cell stack 12 and the second fuel cell stack 15 are consistent, it means that the performance of the first fuel cell stack 12 and the second fuel cell stack 15 are consistent, otherwise it means that the performance of the first fuel cell stack 12 and the second fuel cell stack 15 are inconsistent.

[0028] When it is detected that the performance of the first fuel cell stack 12 and the second fuel cell stack 15 are consistent and the heat dissipation required by the first fuel cell stack 12 and the second fuel cell stack 15 are the same, the opening of the three-way valve 3 is 50%, and the openings of the first water inlet and the second water inlet of the three-way valve 3 are the same, ensuring that the coolant flow rates in the first fuel cell stack 12 and the second fuel cell stack 15 are the same.

[0029] When it is detected that the performance of the first fuel cell stack 12 and the second fuel cell stack 15 are inconsistent and the heat dissipation required by the first fuel cell stack 12 and the second fuel cell stack 15 are different, at this time, by changing the opening of the first water inlet and the second water inlet of the three-way valve 3, the opening sizes of the first water inlet and the second water inlet of the three-way valve 3 are made different, thereby making the coolant flow rates in the first fuel cell stack 12 and the second fuel cell stack 15 different, so that different heat dissipation can be provided for the two fuel cell stacks.

[0030] A three-way valve 3 is provided in the cooling system, and the three-way valve 3 can adjust the opening according to the performance of the first fuel cell stack 12 and the second fuel cell stack 15. It is only necessary to control the three-way valve 3 and adjust the opening of the three-way valve 3 to provide the same or different heat dissipation for the two fuel cell stacks, thereby solving the problem that when the performance of the two stacks of the dual-stack fuel cell system is not completely consistent, one system is used to control the two stacks, and the heat dissipation requirements of the two stacks are different. The cost and volume of the dual-stack fuel cell system using two independent systems to control the two stacks respectively are reduced, the flexibility of the system layout is improved, and the cost is significantly reduced.

[0031] like Figure 1 As shown, when the temperature of the fuel cell stack is low, the cooling system can form a small cooling water circulation loop that does not flow through the radiator assembly 2, and the PTC6 generates heat during operation. The coolant flowing out of the first fuel cell stack 12 and the second fuel cell stack 15 flows through the three-way valve 3, the water pump 7, the PTC6 and the thermostat 42 in turn, and then returns to the first fuel cell stack 12 and the second fuel cell stack 15, wherein the deionizer 8 is connected in parallel to the cooling circuit, and the deionizer 8 is used to filter the ions precipitated from the system in the coolant.

[0032] When the temperature of the fuel cell stack increases, the cooling system can form a large circulation loop of cooling water flowing through the radiator assembly 2. The coolant flowing out of the first fuel cell stack 12 and the second fuel cell stack 15 flows through the three-way valve 3, the water pump 7, the radiator assembly 2, the particulate filter 5 and the thermostat 42 in turn, and then returns to the first fuel cell stack 12 and the second fuel cell stack 15, wherein the radiator assembly 2 cools the coolant.

[0033] like Figure 1 As shown, a first sensor 4 is provided in the pipeline connecting the radiator assembly 2 and the particle filter 5. The first sensor 4 is a temperature sensor. The first sensor 4 is used to monitor the outlet temperature of the radiator assembly 2. The thermostat 42 determines its opening according to the outlet temperature of the radiator assembly 2 and the temperature of the cooling path that needs to enter the stack. If the outlet temperature of the radiator assembly 2 is too low, the opening of the thermostat 42 will be smaller. If the outlet temperature of the radiator assembly 2 is high, the opening of the thermostat 42 will be larger. A water pressure sensor 9 is provided in the pipeline connecting the water pump 7 and the three-way valve 3.

[0034] A second sensor 10 is arranged in the pipeline connecting the thermostat 42 and the first fuel cell stack 12. The second sensor 10 is a temperature-pressure integrated sensor for detecting water temperature and pressure; a third sensor 13 is arranged in the pipeline connecting the thermostat 42 and the second fuel cell stack 15. The third sensor 13 is a temperature-pressure integrated sensor for detecting water temperature and pressure; a fourth sensor 11 is arranged in the pipeline connecting the three-way valve 3 and the first fuel cell stack 12. The fourth sensor 11 is a temperature sensor for detecting water temperature; a fifth sensor 14 is arranged in the pipeline connecting the three-way valve 3 and the second fuel cell stack 15. The fifth sensor 14 is a temperature sensor for detecting water temperature.

[0035] like Figure 1 As shown, the hydrogen supply system includes a hydrogen tank 23, an ejector assembly 19, a hydrogen circulation pump 18 and a gas-water separator 17, the hydrogen circulation pump 18 is connected to the ejector assembly 19 and the gas-water separator 17, and the ejector assembly 19 is connected to the first fuel cell stack 12 and the second fuel cell stack 15.

[0036] like Figure 1 As shown, a proportional valve 20, a shut-off valve 21 and a pressure reducing valve 22 are arranged between the hydrogen tank 23 and the ejector assembly 19. One end of the pressure reducing valve 22 is connected to the hydrogen tank 23, the other end of the pressure reducing valve 22 is connected to one end of the shut-off valve 21, the other end of the shut-off valve 21 is connected to one end of the proportional valve 20, the other end of the proportional valve 20 is connected to one end of the ejector assembly 19, and the other end of the ejector assembly 19 is connected to the air inlets of the first fuel cell stack 12 and the second fuel cell stack 15.

[0037] like Figure 1 As shown, one end of the hydrogen circulation pump 18 is connected to the ejector assembly 19, and the other end of the hydrogen circulation pump 18 is connected to the gas-water separator 17, and the gas-water separator 17 is connected to the gas outlets of the first fuel cell stack 12 and the second fuel cell stack 15. The outlet of the gas-water separator 17 is connected to the inlet of the nitrogen exhaust valve 25 and the water drain valve 27, and the outlet of the nitrogen exhaust valve 25 and the water drain valve 27 is connected to the tail exhaust mixing pipe 26, and the tail exhaust mixing pipe 26 is connected to the air supply system.

[0038] The hydrogen tank 23 provides hydrogen, which passes through the pressure reducing valve 22 to the shut-off valve 21, and the pressure of the stack is controlled by the proportional valve 20. The hydrogen circulated back through the ejector assembly 19 and the outlet of the hydrogen circulation pump 18 is mixed, and then passed to the first fuel cell stack 12 and the second fuel cell stack 15. The hydrogen and water that do not participate in the reaction from the first fuel cell stack 12 and the second fuel cell stack 15 are received by the gas-water separator 17, and the hydrogen and water are separated. The excess water is discharged from the drain valve 27 through the tail exhaust mixing pipe 26, and the nitrogen doped in the flow channel is discharged from the nitrogen exhaust valve 25 through the tail exhaust mixing pipe 26. The hydrogen that does not participate in the reaction is circulated back to the ejector assembly 19 by the hydrogen circulation pump 18 and flows into the stack again.

[0039] like Figure 1 As shown, a hydrogen inlet pressure sensor 31 and a hydrogen inlet temperature sensor 34 are arranged in the pipeline connecting the ejector assembly 19 and the first fuel cell stack 12 and the second fuel cell stack 15, and a hydrogen outlet pressure sensor 16 and a hydrogen outlet temperature sensor 18 are arranged in the pipeline connecting the gas-water separator 17 and the first fuel cell stack 12 and the second fuel cell stack 15. The hydrogen outlet pressure sensor 16 is used to detect the pressure in the pipeline, and the hydrogen outlet temperature sensor 18 is used to detect the temperature in the pipeline.

[0040] like Figure 1 As shown, the air supply system provides air adapted to the performance of the two fuel cell stacks, and the air supply system includes an air compressor 43 and an intercooler 41 connected to each other, the intercooler 41 is connected to the first fuel cell stack 12 and the second fuel cell stack 15, and the intercooler 41 is also connected to the cooling system. The air supply system also includes an air filter 45 and an air mass flow meter 44, and the air mass flow meter 44 is located between the air filter 45 and the air compressor 43 and connected to the air filter 45 and the air compressor 43. One end of the air compressor 43 is connected to the air mass flow meter 44, and the other end of the air compressor 43 is connected to the air inlet of the intercooler 41, and the air outlet of the intercooler 41 is connected to the air inlet of the first fuel cell stack 12 and the second fuel cell stack 15.

[0041] like Figure 1 As shown, a first air inlet shut-off valve 39 is provided in the pipeline connecting the intercooler 41 and the first fuel cell stack 12 to provide the first fuel cell stack 12 with air adapted to the performance of the fuel cell stack; a second air inlet shut-off valve 32 is provided in the pipeline connecting the intercooler 41 and the second fuel cell stack 15 to provide the second fuel cell stack 15 with air adapted to the performance of the fuel cell stack.

[0042] like Figure 1 As shown, a first air outlet shutoff valve 46 is provided in the pipeline connecting the tail exhaust mixing pipe 26 and the air outlet of the first fuel cell stack 12 to control the air pressure of the first fuel cell stack 12. A second air outlet shutoff valve 29 is provided in the pipeline connecting the tail exhaust mixing pipe 26 and the air outlet of the second fuel cell stack 15 to control the air pressure of the second fuel cell stack 15. The stack air outlet pressure is controlled by two air outlet shutoff valves. By changing the opening of the first air outlet shutoff valve 46, the required air pressure can be provided for the first fuel cell stack 12 to achieve air pressure regulation; by changing the opening of the second air outlet shutoff valve 29, the required air pressure can be provided for the second fuel cell stack 15 to achieve air pressure regulation. The first air outlet shutoff valve 46 and the second air outlet shutoff valve 29 are solenoid valves, which are convenient and simple to adjust.

[0043] like Figure 1As shown, an air inlet temperature sensor 38 is provided in the pipeline connecting the intercooler 41 and the first fuel cell stack 12 and the second fuel cell stack 15 , and the air inlet temperature sensor 38 is used to detect the temperature in the pipeline.

[0044] A first air inlet pressure sensor 40 is provided in the pipeline connecting the intercooler 41 and the first fuel cell stack 12, and the first air inlet pressure sensor 40 is used to detect the pressure in the pipeline. A second air inlet pressure sensor 33 is provided in the pipeline connecting the intercooler 41 and the second fuel cell stack 15, and the second air inlet pressure sensor 33 is used to detect the pressure in the pipeline.

[0045] A first air outlet temperature sensor 35 and a first air outlet pressure sensor 37 are arranged in the pipeline connecting the tail exhaust mixing pipe 26 and the first fuel cell stack 12, and a second air outlet pressure sensor 30 is arranged in the pipeline connecting the tail exhaust mixing pipe 26 and the second fuel cell stack 15, so as to realize effective monitoring of air pressure and temperature.

[0046] like Figure 1 As shown, the intercooler 41 is connected to the tail exhaust mixing pipe 26 through the bypass valve 36. The water inlet of the intercooler 41 is connected to the pipeline connecting the thermostat 42 and the first fuel cell stack 12, and the water outlet of the intercooler 41 is connected to the pipeline connecting the three-way valve 3 and the water pump 7. The coolant of the cooling system enters the intercooler 41 to cool the air in the intercooler 41.

[0047] The present invention also provides a thermal management control method for a dual-stack fuel cell system. During the operation of the dual-stack fuel cell system, the three-way valve 3 can adjust the opening according to the performance of the first fuel cell stack 12 and the second fuel cell stack 15, and then adjust the coolant flow of the first fuel cell stack 12 and the second fuel cell stack 15, so that the coolant flow of the first fuel cell stack 12 and the second fuel cell stack 15 is the same or different.

[0048] When it is detected that the performance of the first fuel cell stack 12 and the second fuel cell stack 15 are consistent and the heat dissipation required by the first fuel cell stack 12 and the second fuel cell stack 15 are the same, the opening of the three-way valve 3 is 50%, and the openings of the first water inlet and the second water inlet of the three-way valve 3 are the same, ensuring that the coolant flow rates in the first fuel cell stack 12 and the second fuel cell stack 15 are the same.

[0049] When it is detected that the performance of the first fuel cell stack 12 and the second fuel cell stack 15 are inconsistent and the heat dissipation required by the first fuel cell stack 12 and the second fuel cell stack 15 are different, at this time, by changing the opening of the first water inlet and the second water inlet of the three-way valve 3, the opening sizes of the first water inlet and the second water inlet of the three-way valve 3 are made different, thereby making the coolant flow rates in the first fuel cell stack 12 and the second fuel cell stack 15 different, so that different heat dissipation can be provided for the two fuel cell stacks.

[0050] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A dual-stack fuel cell system, comprising a first fuel cell stack, a second fuel cell stack, a hydrogen supply system for supplying hydrogen to the first fuel cell stack and the second fuel cell stack, an air supply system for supplying air to the first fuel cell stack and the second fuel cell stack, and a cooling system for supplying a coolant to the first fuel cell stack and the second fuel cell stack, characterized in that: The cooling system includes a three-way valve connected to the first fuel cell stack and the second fuel cell stack, and the three-way valve is configured to be able to adjust the opening according to the performance of the first fuel cell stack and the second fuel cell stack.

2. The dual-stack fuel cell system according to claim 1, characterized in that: The cooling system also includes a PTC, a water pump, a thermostat and a radiator assembly. The water pump is connected to the three-way valve and the radiator assembly. The radiator assembly is connected to the thermostat. The thermostat is connected to the first fuel cell stack and the second fuel cell stack. The PTC is connected to the water pump and the thermostat.

3. The dual-stack fuel cell system according to claim 2, characterized in that: The cooling system further comprises a deionizer, and the deionizer is connected to the water pump and the thermostat.

4. The dual-stack fuel cell system according to claim 2, characterized in that: The cooling system further includes a particulate filter connected to the radiator assembly and the thermostat and located between the radiator assembly and the thermostat.

5. The dual-stack fuel cell system according to any one of claims 1 to 4, characterized in that: The hydrogen supply system includes a hydrogen tank, an ejector assembly, a hydrogen circulation pump and a gas-water separator. The hydrogen circulation pump is connected to the ejector assembly and the gas-water separator. The ejector assembly is connected to the first fuel cell stack and the second fuel cell stack.

6. The dual-stack fuel cell system according to claim 5, characterized in that: A proportional valve, a shut-off valve and a pressure reducing valve are arranged between the hydrogen tank and the ejector assembly.

7. The dual-stack fuel cell system according to claim 5, characterized in that: The gas-water separator is connected to the nitrogen exhaust valve and the water drain valve, the nitrogen exhaust valve and the water drain valve are connected to the tail exhaust mixing pipe, and the tail exhaust mixing pipe is connected to the air supply system.

8. The dual-stack fuel cell system according to any one of claims 1 to 7, characterized in that: The air supply system includes an air compressor and an intercooler connected to each other. The intercooler is connected to the first fuel cell stack and the second fuel cell stack, and the intercooler is connected to the cooling system.

9. The dual-stack fuel cell system according to claim 8, characterized in that: The air supply system further comprises an air filter and an air mass flow meter, wherein the air mass flow meter is located between the air filter and the air compressor and is connected to the air filter and the air compressor.

10. The thermal management control method of a dual-stack fuel cell system according to any one of claims 1 to 9, characterized in that: During the operation of the dual-stack fuel cell system, the three-way valve can adjust the opening according to the performance of the first fuel cell stack and the second fuel cell stack, and then adjust the coolant flow of the first fuel cell stack and the second fuel cell stack to meet the different heat dissipation requirements of the dual-stack fuel cells.

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