Fuel cell heat management system based on tail gas catalytic combustion and phase change heat storage

Abstract

The invention discloses a fuel cell heat management system based on tail gas catalytic combustion and phase change heat storage, relates to the technical field of fuel cells, and solves the problems of cold start and heat management of the fuel cells. A gas supply unit, a fuel cell and a tail gas catalytic combustion unit are sequentially communicated; the phase change heat storage unit communicates with the gas supply unit, the fuel cell, the tail gas catalytic combustion unit and the cooling unit. The cooling unit is also communicated with the fuel cell; the control unit is connected with the gas supply unit, the fuel cell, the tail gas catalytic combustion unit, the phase change heat storage unit and the cooling unit. Through combination of tail gas catalytic combustion and a phase change heat storage technology, an efficient heat management solution is provided, the overall performance and reliability of the fuel cell are improved, the starting performance of the fuel cell in a cold environment is improved, effective temperature management can be realized in a normal working mode, and long-term stable operation of a system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel cell thermal management system based on tail gas catalytic combustion and phase change heat storage. Background Art

[0002] Fuel cells are highly efficient and environmentally friendly energy conversion devices that are widely used in transportation, portable devices, and stationary power sources. Among them, fuel cells have attracted much attention due to their fast start-up, high power density, and environmentally friendly characteristics. However, there are still some technical challenges in practical applications, especially cold start and thermal management issues.

[0003] When a fuel cell is started at low temperatures, it is easy to have a long start-up time and low efficiency due to the slow electrochemical reaction rate, reduced conductivity of the electrolyte membrane, and differences in heat capacity between components. This is particularly evident in cold regions, which not only affects the performance and life of the fuel cell, but also affects the user experience. Therefore, effectively solving the cold start problem of fuel cells has become a research focus.

[0004] Fuel cells generate a lot of heat when they are working, especially when they are running at high power. Effective heat dissipation is the key to maintaining a stable temperature of the fuel cell and preventing overheating to avoid performance degradation or damage. Therefore, designing an efficient thermal management system is crucial to the safety and life of the fuel cell. Summary of the invention

[0005] In order to solve the cold start and thermal management problems of the fuel cell mentioned above, the present invention proposes a fuel cell thermal management system based on exhaust catalytic combustion and phase change heat storage. The present invention provides an efficient thermal management solution by combining exhaust catalytic combustion with phase change heat storage technology to improve the overall performance and reliability of the fuel cell. This solution can not only improve the starting performance of the fuel cell in a cold environment, but also achieve effective temperature management in the normal working mode to ensure the long-term stable operation of the system.

[0006] The present invention proposes a fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage, which specifically includes a gas supply unit, a fuel cell, an exhaust gas catalytic combustion unit, a phase change heat storage unit, a cooling unit and a control unit, wherein the gas supply unit, the fuel cell and the exhaust gas catalytic combustion unit are connected in sequence; the phase change heat storage unit is respectively connected to the gas supply unit, the fuel cell, the exhaust gas catalytic combustion unit and the cooling unit; the cooling unit is also connected to the fuel cell; the control unit is respectively connected to the gas supply unit, the fuel cell, the exhaust gas catalytic combustion unit, the phase change heat storage unit and the cooling unit; the exhaust gas catalytic combustion unit includes a catalytic burner, a second solenoid valve and a third solenoid valve, and the cathode and anode outlets of the fuel cell are both connected to the catalytic burner; one outlet of the catalytic burner is connected to the fuel cell through a second solenoid valve, and the other outlet is connected to the phase change heat storage unit through a third solenoid valve.

[0007] Furthermore, the phase change heat storage unit includes a phase change heat storage device and a solenoid valve four. The phase change heat storage device is connected to the catalytic burner through the solenoid valve three and to the gas supply unit through the solenoid valve four. The phase change heat storage device is also connected to the fuel cell and the cooling unit.

[0008] Furthermore, the cooling unit includes a coolant tank, a radiator, a liquid pump, a solenoid valve five and a solenoid valve six, and the coolant tank, the radiator, the liquid pump and the solenoid valve five are connected in sequence; the inlet end of the coolant tank is connected to the fuel cell, and a branch is provided on the connecting pipeline, and the branch is connected to the phase change heat storage device; the solenoid valve six is ​​provided on the branch; the outlet end of the solenoid valve five is connected to the fuel cell.

[0009] Furthermore, the cooling unit also includes a temperature sensor, which is arranged between the fuel cell and the branch inlet.

[0010] Furthermore, the boiling point of the coolant in the coolant storage tank is 60-80° C. higher than the operating temperature of the fuel cell.

[0011] Furthermore, the coolant is deionized water or a mixture of ethylene glycol and water.

[0012] Furthermore, the gas supply unit includes a hydrogen storage tank, a first humidifier, an air compressor and a second humidifier, the hydrogen storage tank, the first humidifier and the cathode of the fuel cell are connected in sequence; the air compressor, the second humidifier and the anode of the fuel cell are connected in sequence; the inlet end of the air compressor is connected to the phase change heat storage unit.

[0013] Furthermore, a solenoid valve 1 is provided between the hydrogen storage tank and the first humidifier.

[0014] Furthermore, the particle size of the catalyst in the catalytic combustor is 1 to 5 nm.

[0015] Furthermore, the catalyst uses precious metals.

[0016] The beneficial effects of a fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage described in the present invention are:

[0017] (1) The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage described in the present invention utilizes a control unit combined with a temperature sensor. The present invention can monitor the temperature changes of the fuel cell system in real time and automatically control the switching state of the solenoid valve to achieve seamless switching between the cold start mode and the normal operating mode. This enables the system to not only cope with the challenge of low-temperature start-up, but also maintain efficient energy utilization and stable performance during normal operation, thereby reducing dependence on external energy and meeting the requirements of sustainable development.

[0018] (2) The present invention discloses a fuel cell thermal management system based on exhaust catalytic combustion and phase change heat storage. In the cold start mode, the present invention utilizes the incompletely burned fuel components in the fuel cell exhaust gas to supply the fuel cell with heat generated by the catalytic combustion process, so that it can quickly heat up in a low temperature environment, which not only shortens the start-up time, but also reduces the start-up energy consumption. The rational use of these exhaust gases can not only recover energy, but also reduce the emission of harmful substances. By treating the exhaust gas through catalytic combustion, energy can be recovered and used to assist the cold start and thermal management of the fuel cell, thereby improving the overall efficiency of the system.

[0019] (3) The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage described in the present invention, in cold start mode, phase change heat storage is used to preheat the air at the air compressor inlet, which solves the problem of slow heating in high-cold environments in the prior art, ensures that the fuel cell maintains optimal performance under various working conditions, and extends the service life of the system. Molten salt, as a heat storage medium, can effectively store and release heat and is suitable for fuel cell thermal management systems. Through phase change heat storage technology, the required heat support can be provided during cold start or rapid heating.

[0020] (4) The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage described in the present invention, in normal working mode, transfers part of the heat generated by the electrochemical process of the fuel cell and the heat generated by the exhaust gas catalytic combustion to the phase change heat storage for heat storage, thereby improving the energy efficiency and stability of the system. As long as the solenoid valve 6 is closed, the heat is locked in the phase change heat storage for long-term storage. It is not limited by time and ambient temperature, and does not require long-term insulation and heat preservation, thereby reducing the cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] In the attached picture:

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to the present invention;

[0024] Among them: 1-gas supply unit, 101-hydrogen storage tank, 102-solenoid valve one, 103-first humidifier, 104-air compressor, 105-second humidifier, 2-fuel cell, 3-exhaust catalytic combustion unit, 301-catalytic burner, 302-solenoid valve two, 303-solenoid valve three, 4-phase change heat storage unit, 401-phase change heat storage, 402-solenoid valve four, 5-cooling unit, 501-coolant storage tank, 502-radiator, 503-liquid pump, 504-solenoid valve five, 505-solenoid valve six, 506-temperature sensor, 6-control unit. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the invention, it should be noted that, 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0028] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Specific Embodiment 1: Refer to Figure 1 This embodiment will be specifically described. A fuel cell thermal management system based on tail gas catalytic combustion and phase change heat storage described in this embodiment specifically includes a gas supply unit 1, a fuel cell 2, a tail gas catalytic combustion unit 3, a phase change heat storage unit 4, a cooling unit 5, and a control unit 6. The gas supply unit 1, the fuel cell 2, and the tail gas catalytic combustion unit 3 are connected in sequence; the phase change heat storage unit 4 is respectively connected to the gas supply unit 1, the fuel cell 2, the tail gas catalytic combustion unit 3, and the cooling unit 5; the cooling unit 5 is also connected to the fuel cell 2; the control unit 6 is respectively connected to the gas supply unit 1, the fuel cell 2, the tail gas catalytic combustion unit 3, the phase change heat storage unit 4, and the cooling unit 5;

[0030] The tail gas catalytic combustion unit 3 includes a catalytic combustor 301, a solenoid valve two 302, and a solenoid valve three 303. The cathode and anode outlets of the fuel cell 2 are both connected to the inlet of the catalytic combustor 301; one outlet of the catalytic combustor 301 is connected to the fuel cell 2 through the solenoid valve two 302 in the cold start state to supply the high-temperature tail gas heat to the fuel cell 2, enabling it to quickly warm up in a low-temperature environment; the other outlet of the catalytic combustor 301 is connected to the phase change heat storage unit 4 through the solenoid valve three 303 in the normal state to store the high-temperature tail gas heat in the phase change heat storage device 401.

[0031] The phase change heat storage unit 4 includes a phase change heat storage device 401 and a solenoid valve four 402. The phase change heat storage device 401 is connected to the catalytic combustor 301 through the solenoid valve three 303 and is connected to the gas supply unit 1 through the solenoid valve four 402; the phase change heat storage device 401 is also connected to the fuel cell 2 and the cooling unit 5. The phase change heat storage device 401 is filled with a phase change heat storage material with a high specific heat capacity and a high melting point, such as molten salt.

[0032] The cooling unit 5 includes a coolant tank 501, a radiator 502, a liquid pump 503, a solenoid valve 504 and a solenoid valve 6 505. The coolant tank 501, the radiator 502, the liquid pump 503 and the solenoid valve 504 are connected in sequence; the inlet end of the coolant tank 501 is connected to the fuel cell 2, and a branch is provided on the connected pipeline, and the branch is connected to the phase change heat storage device 401; the solenoid valve 6 505 is provided on the branch; the outlet end of the solenoid valve 504 is connected to the fuel cell 2. In the cold start state, the solenoid valve 402 is opened, the solenoid valve 504 and the solenoid valve 6 505 are closed, and the heat absorbed by the phase change heat storage device 401 is supplied to the fuel cell 2, so that it can quickly heat up in a low temperature environment. In the normal state, the solenoid valve 504 and the solenoid valve 6 505 are opened, and the solenoid valve 402 is closed, and the phase change heat storage device 401 absorbs the heat generated by the fuel cell 2, so that it maintains a proper temperature during operation.

[0033] The cooling unit 5 also includes a temperature sensor 506, which is arranged between the fuel cell 2 and the branch inlet; the control unit 6 receives temperature feedback data from the temperature sensor 506, and then controls the switching status of several solenoid valves to achieve seamless switching of the fuel cell 2 between the cold start mode and the normal working mode.

[0034] The boiling point of the coolant in the coolant storage tank 501 is 60° C. to 80° C. higher than the operating temperature of the fuel cell 2 .

[0035] The coolant is a liquid with high thermal conductivity, low viscosity, and non-conductive properties, such as deionized water or a mixture of ethylene glycol and water.

[0036] The gas supply unit 1 includes a hydrogen storage tank 101, a first humidifier 103, an air compressor 104 and a second humidifier 105. The hydrogen storage tank 101, the first humidifier 103 and the cathode of the fuel cell 2 are connected in sequence; the air compressor 104, the second humidifier 105 and the anode of the fuel cell 2 are connected in sequence; the inlet end of the air compressor 104 is connected to the outlet end of the solenoid valve 402 of the phase change heat storage unit 4 to preheat the air at the air compressor inlet.

[0037] A solenoid valve 102 is provided between the hydrogen storage tank 101 and the first humidifier 103 .

[0038] The particle size of the catalyst in the catalytic burner 301 is 1-5 nm. The catalyst is made of precious metal, such as platinum.

[0039] The specific working process of a fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage described in the present invention is:

[0040] When in use, it is specifically divided into two modes: a cold start mode and a normal working mode. By combining the control unit 6 with the temperature sensor 506, the present invention can monitor the temperature changes of the fuel cell system in real time, and automatically control the switching state of the solenoid valve to achieve seamless switching between the cold start mode and the normal working mode, so that the system can not only cope with the challenge of low-temperature startup, but also maintain efficient energy utilization and stable performance during normal operation.

[0041] In the cold start mode, the control unit 6 adjusts the solenoid valve 1 102, the solenoid valve 2 302, and the solenoid valve 4 402 to the open state, and the solenoid valve 3 303, the solenoid valve 504, and the solenoid valve 6 505 remain in the closed state. The hydrogen in the hydrogen storage tank 101 is humidified by the first humidifier 103 and output to the anode of the fuel cell 2. The air heated by the phase change heat storage device 401 enters the air compressor 104 for reheating, and then is humidified by the second humidifier 105 and transported to the cathode of the fuel cell 2. The anode exhaust and the cathode exhaust are mixed and enter the catalytic burner 301 for catalytic combustion, and then the generated heat is supplied to the fuel cell 2. The tail gas catalytic combustion unit 3 and the phase change heat storage unit 4 cooperate with each other, so that the fuel cell 2 can quickly heat up in a low temperature environment, which not only shortens the start-up time, but also reduces the start-up energy consumption and improves the overall efficiency of the system.

[0042] In normal working mode, the control unit adjusts the electromagnetic valve 102, electromagnetic valve 303, electromagnetic valve 504, and electromagnetic valve 6 505 to the open state, and the electromagnetic valve 2 302 and electromagnetic valve 4 402 to the closed state. At this time, the heat generated by the electrochemical process of the fuel cell 2 and the heat generated by the catalytic combustion of the exhaust gas are transferred to the phase change heat storage 401 for heat storage, which improves the energy efficiency and stability of the system. At the same time, as long as the electromagnetic valve 6 505 is closed, the heat is locked in the phase change heat storage for a long time. It is not limited by time and ambient temperature, and does not require long-term insulation and heat preservation, thereby reducing the cost of the device.

[0043] During the cold start process, the temperature sensor 506 in the system monitors the temperature of the fuel cell 2 in real time. When the temperature reaches the set start temperature threshold, the system determines that the fuel cell 2 has the conditions for stable electrochemical reaction, and the control unit 6 switches the system from the cold start mode to the normal working mode. In the normal working mode, the system relies on internal and external heat sources (such as exhaust gas catalytic combustion 301, phase change heat storage 401) to maintain the operating temperature of the fuel cell 2 to ensure the efficient operation of the fuel cell 2. At the same time, the control unit 6 adjusts the operating mode of the phase change heat storage unit 4 and the cooling unit 5, optimizes heat management, and keeps the fuel cell 2 within the optimal operating temperature range.

[0044] During operation, if the temperature of the fuel cell 2 drops below the set critical temperature due to external environmental changes, system load fluctuations, or other factors (i.e., below the lower limit of the normal operating temperature range), the system needs to re-enter the cold start mode. The temperature sensor 506 continuously monitors the temperature change of the fuel cell. When the detected temperature is lower than the start threshold, the system will automatically respond.

[0045] The switching logic is executed by the control unit 6 in the system, and judgments and operations are made based on the real-time data of the temperature sensor 506. This logic ensures that the system automatically switches the operating mode under different temperature conditions, optimizing the start-up performance and operating efficiency of the fuel cell 2.

[0046] Through the above mechanism, the system of the present invention can efficiently perform cold start under low-temperature environments or other adverse conditions and automatically switch to the normal operating mode after the fuel cell 2 reaches the stable operating temperature. When the temperature is lower than the set threshold, the system will automatically switch back to the cold start mode, ensuring that the fuel cell 2 is always within the appropriate temperature range, guaranteeing its stability and safety.

[0047] Summarizing the above embodiments, a fuel cell thermal management system based on tail gas catalytic combustion and phase change heat storage described in the present invention combines a control unit with a temperature sensor. The present invention can monitor the temperature change of the fuel cell system in real time and automatically control the on-off state of the solenoid valve, realizing seamless switching between the cold start mode and the normal operating mode. The system can not only cope with the challenges of low-temperature start-up but also maintain efficient energy utilization and stable performance during normal operation, reducing dependence on external energy and meeting the requirements of sustainable development.

[0048] For a fuel cell thermal management system based on tail gas catalytic combustion and phase change heat storage described in the present invention, in the cold start mode, the present invention utilizes the unburned fuel components in the fuel cell tail gas, and the heat generated through the catalytic combustion process is supplied to the fuel cell 2, enabling it to rapidly increase the temperature in a low-temperature environment, not only shortening the start-up time but also reducing the start-up energy consumption. Reasonable utilization of these tail gases can not only recover energy but also reduce the emission of harmful substances. By catalytically combusting the tail gas, energy can be recovered and used to assist the cold start and thermal management of the fuel cell, improving the overall efficiency of the system.

[0049] The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage described in the present invention, in cold start mode, phase change heat storage is used to preheat the air at the air compressor inlet, which solves the problem of slow heating in high-cold environments in the prior art, ensures that the fuel cell 2 maintains optimal performance under various working conditions, and extends the service life of the system. Molten salt, as a heat storage medium, can effectively store and release heat and is suitable for the thermal management system of the fuel cell 2. Through phase change heat storage technology, the required heat support can be provided during cold start or rapid heating.

[0050] The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage described in the present invention, in normal working mode, transfers part of the heat generated by the electrochemical process of the fuel cell 2 and the heat generated by the exhaust gas catalytic combustion to the phase change heat storage 401 for heat storage, thereby improving the energy efficiency and stability of the system. As long as the solenoid valve 6505 is closed, the heat is locked in the phase change heat storage 401 for long-term storage. It is not limited by time and ambient temperature, and does not require long-term insulation and heat preservation, thereby reducing the cost of the device.

[0051] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the invention. It can also be a reasonable combination of the features recorded in the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage, characterized in that: The invention comprises a gas supply unit (1), a fuel cell (2), an exhaust gas catalytic combustion unit (3), a phase change heat storage unit (4), a cooling unit (5) and a control unit (6); the gas supply unit (1), the fuel cell (2) and the exhaust gas catalytic combustion unit (3) are connected in sequence; the phase change heat storage unit (4) is connected to the gas supply unit (1), the fuel cell (2), the exhaust gas catalytic combustion unit (3) and the cooling unit (5) respectively; the cooling unit (5) is also connected to the fuel cell (2); the control unit (6) is connected to the gas supply unit (1), the fuel cell (2), the exhaust gas catalytic combustion unit (3), the phase change heat storage unit (4) and the cooling unit (5) respectively; The tail gas catalytic combustion unit (3) comprises a catalytic burner (301), a second solenoid valve (302) and a third solenoid valve (303); the cathode and anode outlets of the fuel cell (2) are both connected to the catalytic burner (301); one outlet of the catalytic burner (301) is connected to the fuel cell (2) via the second solenoid valve (302), and the other outlet is connected to the phase change heat storage unit (4) via the third solenoid valve (303).

2. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 1 is characterized in that: The phase change heat storage unit (4) comprises a phase change heat storage device (401) and a solenoid valve (402); the phase change heat storage device (401) is connected to the catalytic burner (301) via a solenoid valve (303), and is connected to the gas supply unit (1) via a solenoid valve (402); the phase change heat storage device (401) is also connected to the fuel cell (2) and the cooling unit (5).

3. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 1 is characterized in that: The cooling unit (5) comprises a coolant storage tank (501), a radiator (502), a liquid pump (503), a solenoid valve five (504) and a solenoid valve six (505); the coolant storage tank (501), the radiator (502), the liquid pump (503) and the solenoid valve five (504) are connected in sequence; the inlet end of the coolant storage tank (501) is connected to the fuel cell (2), and a branch is provided on the connected pipeline, and the branch is connected to the phase change heat storage device (401); the solenoid valve six (505) is provided on the branch; the outlet end of the solenoid valve five (504) is connected to the fuel cell (2).

4. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 3 is characterized in that: The cooling unit (5) further comprises a temperature sensor (506), and the temperature sensor (506) is arranged between the fuel cell (2) and the branch inlet.

5. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 3 is characterized in that: The boiling point of the coolant in the coolant storage tank (501) is 60 to 80° C. higher than the operating temperature of the fuel cell (2).

6. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 5 is characterized in that: The coolant is deionized water or a mixture of ethylene glycol and water.

7. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 1 is characterized in that: The gas supply unit (1) comprises a hydrogen storage tank (101), a first humidifier (103), an air compressor (104) and a second humidifier (105); the hydrogen storage tank (101), the first humidifier (103) and the cathode of the fuel cell (2) are connected in sequence; the air compressor (104), the second humidifier (105) and the anode of the fuel cell (2) are connected in sequence; and the inlet end of the air compressor (104) is connected to the phase change heat storage unit (4).

8. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 7 is characterized in that: A solenoid valve 1 (102) is provided between the hydrogen storage tank (101) and the first humidifier (103).

9. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 1 is characterized in that: The particle size of the catalyst in the catalytic burner (301) is 1 to 5 nm.

10. The fuel cell thermal management system based on exhaust gas catalytic combustion and phase change heat storage according to claim 9, characterized in that: The catalyst uses a noble metal.

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