High-temperature fuel cell thermal management system and operation method thereof

Abstract

The invention discloses a high-temperature fuel cell thermal management system and an operation method thereof. Comprising an electric three-way ball valve, an electric pile heat conduction oil outlet pipeline I communicated with an inlet of the electric three-way ball valve, an oil tank oil outlet pipeline communicated with a first controllable outlet of the electric three-way ball valve, and a heat exchanger inlet pipeline communicated with a second controllable outlet of the electric three-way ball valve, the device further comprises an oil tank, an oil pump, a pressure transmitter, a flow sensor, an electric heater, a galvanic pile, a heat exchanger, a galvanic pile heat conduction oil inlet temperature sensor and a galvanic pile heat conduction oil outlet temperature sensor. In the starting stage of the system, through a small-circulation oil path, devices needing to be heated are reduced, heat loss is reduced, and the beneficial effects of rapid temperature rise of the galvanic pile and rapid starting of the system are achieved; and in the stable operation stage, a heat exchanger for heat adjustment is added through a large-circulation oil path, and the stack temperature can be quickly adjusted and the temperature fluctuation can be reduced by adjusting and matching the flow of an oil pump and the heat dissipating capacity of the heat exchanger, so that the stable output of the fuel cell system is realized.

Description

Technical Field

[0001] The present application relates to a high-temperature fuel cell thermal management system and an operation method thereof, belonging to the technical field of high-temperature fuel cell power generation systems. Background Art

[0002] Due to the advantages of active electrochemical reactions, good CO tolerance, high waste heat utilization rate, and simple water and heat management, high-temperature proton exchange membrane fuel cells are combined with fuel reforming hydrogen production from hydrocarbons, alcohols, etc. to form a high-temperature fuel cell power generation system, and this technology has increasingly become a research hotspot.

[0003] The thermal management system is a key component of the high-temperature fuel cell power generation system. The function of the thermal management system mainly realizes the heat balance between various modules inside the system and between the system and the environment, involving two aspects of system startup and stable operation. During system startup, an electric heater is used to achieve the rapid startup of the processor and the fuel cell stack; during system stable operation, the waste heat generated by the fuel cell stack is taken away by a heat exchanger or a radiator.

[0004] During the startup stage, the existing high-temperature fuel cell power generation system has a slow temperature rise, resulting in a very long time from the start of startup to power generation, generally reaching one hour, which directly limits the adaptability and operation time of the system. The heat transfer medium in the common high-temperature fuel cell thermal management system is heat-conducting oil. As the temperature of the heat-conducting oil rises, some gases will volatilize. If not removed in time, it will affect the heat transfer performance, and it is easy to cause local overheating and coke formation of the heat-conducting oil, blocking the fuel cell stack. The increase in temperature makes the viscosity of the heat-conducting oil decrease and the flow rate increase, increasing the pressure in the heat transfer medium heat exchange chamber of the fuel cell stack, and it is easy to overpressure and leak, which will cause irreversible damage to the membrane electrode. During the system operation stage, the optimal working temperature of the high-temperature proton exchange membrane fuel cell is 160 - 180 °C. Usually, a thermostat is used to adjust the working temperature of the fuel cell stack, but the on-off control method of the thermostat makes the temperature of the fuel cell fluctuate greatly, which will cause the output power of the fuel cell to be unstable and affect the normal operation of the fuel cell stack. Summary of the Invention

[0005] The present application provides a high-temperature fuel cell thermal management system, which can solve the problems of slow startup time of the existing high-temperature fuel cell power generation system, affecting the adaptability and operation time of the system, lack of real-time monitoring and adjustment capabilities for parameters such as temperature, flow rate, and pressure, resulting in a short service life of the system, unreasonable temperature adjustment means, large temperature fluctuations of the fuel cell, and unstable system output power.

[0006] In one aspect of the present application, a high-temperature fuel cell thermal management system is provided, including an electric three-way ball valve, a fuel cell stack heat-conducting oil outlet pipeline I connected to the inlet of the electric three-way ball valve, an oil tank outlet pipeline connected to the first controllable outlet of the electric three-way ball valve, and a heat exchanger inlet pipeline connected to the second controllable outlet of the electric three-way ball valve;

[0007] It also includes a fuel tank, an oil pump, a pressure transmitter, a flow sensor, an electric heater, a stack heat transfer oil inlet temperature sensor, a stack, a stack heat transfer oil outlet temperature sensor, and a heat exchanger;

[0008] The fuel tank is connected to the inlet of the oil pump through the fuel tank oil outlet pipeline;

[0009] The outlet of the oil pump, the pressure transmitter, the flow sensor, the electric heater, the stack heat transfer oil inlet temperature sensor, the stack, and the stack heat transfer oil outlet temperature sensor are connected in sequence;

[0010] The stack heat transfer oil outlet temperature sensor is connected to the stack outlet pipeline;

[0011] The stack outlet pipeline includes a stack heat transfer oil outlet pipeline I and a stack heat transfer oil outlet pipeline II. The stack heat transfer oil outlet pipeline II is connected to the fuel tank, and a stop valve is provided on the stack heat transfer oil outlet pipeline II;

[0012] The heat exchanger inlet pipeline is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the fuel tank oil outlet pipeline;

[0013] The fuel tank has a pressure relief valve. Optionally, the heat exchanger is an air-cooled heat exchanger and / or a water-cooled heat exchanger.

[0014] Optionally, the high-temperature fuel cell thermal management system further includes a control unit;

[0015] The control unit is used to control the flow rate of the oil pump, control the pressure relief valve, the stop valve, the electric three-way ball valve, and the switch of the electric heater according to the monitoring results of at least one of the pressure transmitter, the flow sensor, the stack heat transfer oil inlet temperature sensor, and the stack heat transfer oil outlet temperature sensor.

[0016] Optionally, the fuel tank needs to be resistant to high temperature of 180°C, and the material can be selected from stainless steel and aluminum alloy.

[0017] Optionally, the oil pump, the pressure transmitter, the flow sensor, the stack heat transfer oil inlet temperature sensor, the stack heat transfer oil outlet temperature sensor, and the electric three-way ball valve can all withstand temperatures above 180°C.

[0018] Optionally, the oil pipeline can be a metal bellows, a braided silicone tube, etc.

[0019] As a specific implementation manner, as Figure 1 shown, the high-temperature fuel cell thermal management system includes:

[0020] 1. Pressure relief valve; 2. Fuel tank; 3. Stop valve; 4. Electric three-way ball valve; 5. Temperature sensor at the outlet of the fuel cell stack oil circuit; 6. Fuel cell stack; 7. Temperature sensor at the inlet of the fuel cell stack oil circuit; 8. Electric heater; 9. Flow sensor; 10. Pressure transmitter; 11. Oil pump; 12. Heat exchanger;

[0021] The present application provides a thermal management system for a high-temperature fuel cell, including a fuel tank; the fuel tank is provided with a pressure relief valve and a stop valve, and the fuel tank is connected to an oil pump through an oil outlet pipeline; the outlet of the oil pump is sequentially connected to a pressure transmitter, a flow sensor, and an electric heater; temperature sensors are respectively connected to the inlet and outlet of the heat-conducting oil of the fuel cell stack; the pipeline behind the temperature sensor at the outlet of the fuel cell stack oil circuit is divided into two paths, one path is connected to the stop valve, and the other path is connected to an electric three-way ball valve; one end of the electric three-way ball valve is connected to the oil outlet pipeline of the fuel tank, and the other end is connected to a heat exchanger; the outlet of the heat exchanger is connected to the oil outlet pipeline of the fuel tank.

[0022] Another aspect of the present application provides a thermal management method for a high-temperature fuel cell, adopting the above-mentioned thermal management system for a high-temperature fuel cell. The thermal management method for a high-temperature fuel cell includes:

[0023] In the fuel injection and exhaust stage of the fuel cell, control the first controllable outlet of the electric three-way ball valve to open and the second controllable outlet to close, inject heat-conducting oil into the fuel tank, turn on the oil pump, adjust the flow rate of the oil pump to ensure that the pressure value of the pressure transmitter ≤ the upper limit value of the oil circuit pressure of the fuel cell stack. When the pressure value of the pressure transmitter is stable, control the second controllable outlet of the electric three-way ball valve to open, continue to inject oil into the fuel tank. After the pressure value of the pressure transmitter is stable, turn on the electric heater, monitor the temperature of the temperature sensor at the inlet of the heat-conducting oil of the fuel cell stack. When the temperature of the temperature sensor at the inlet of the heat-conducting oil of the fuel cell stack reaches the operating temperature of the fuel cell stack, stop the electric heater, complete the fuel injection and exhaust of the system, close the stop valve, and the overpressure gas in the fuel tank is discharged from the pressure relief valve;

[0024] In the fuel cell startup stage, control the first controllable outlet of the electric three-way ball valve to open and the second controllable outlet to close, close the stop valve, turn on the oil pump, adjust the flow rate of the oil pump to ensure that the pressure value of the pressure transmitter ≤ the upper limit value of the oil circuit pressure of the fuel cell stack, turn on the electric heater, control the temperature of the temperature sensor at the inlet of the heat-conducting oil of the fuel cell stack to reach the fuel cell discharge temperature, and the fuel cell discharges. When the temperature of the temperature sensor at the outlet of the heat-conducting oil of the fuel cell stack rises to 170 °C, the fuel cell enters the operation stage;

[0025] During the operation stage of the fuel cell, turn off the electric heater, control the opening of the first controllable outlet and the second controllable outlet of the electric three-way ball valve, connect the heat exchanger in series to the oil circuit, and by adjusting the opening of the oil pump, ensure that the flow value of the flow sensor > the minimum value of the flow required for the fuel cell stack heat exchange, the temperature difference between the inlet and outlet of the fuel cell stack oil circuit is less than 10°C, and adjust the heat exchanger to ensure that the temperature of the fuel cell stack heat transfer oil outlet temperature sensor is less than 180°C.

[0026] In this application, 180°C is the maximum value of the optimal temperature range for the fuel cell stack to work. It can also work in the range of 180°C to 200°C, but the service life will be affected. Therefore, the temperature is controlled to be less than 180°C.

[0027] Optionally, the operating temperature of the fuel cell stack is 160 - 200°C.

[0028] Optionally, the operating temperature of the fuel cell stack is 180°C.

[0029] Optionally, the discharge temperature of the fuel cell stack is 120°C.

[0030] As a specific implementation manner, the operation method of the above-mentioned high-temperature fuel cell thermal management system ( Figure 1 ) is as follows:

[0031] During the system oil injection and exhaust stage, inject heat transfer oil into the fuel tank 2, and at the same time, turn on the oil pump 11 to adjust the flow rate to ensure that the pressure value of the pressure transmitter 10 is less than the upper limit value of the oil circuit pressure of the fuel cell stack 6. When the pressure value of the pressure transmitter 10 is basically unchanged, start the electric three-way valve 4 to switch the direction. At this time, the value of the pressure transmitter 10 becomes smaller, and continue to inject oil into the fuel tank 2. When the pressure value of the pressure transmitter 10 is basically unchanged again, turn on the electric heater 8, monitor the temperature of the fuel cell stack oil circuit inlet temperature sensor 7, and stop the electric heater 8 when it reaches 180°C. At this time, the oil injection and exhaust of the thermal management system are completed, close the stop valve 3, and the overpressure gas in the fuel tank is discharged from the pressure relief valve 1.

[0032] During the system startup stage, the starting position inlet end of the electric three-way valve 4 is connected to the fuel cell stack oil circuit outlet temperature sensor 5, and the outlet end is connected to the fuel tank outlet oil pipe. Turn on the oil pump 11 to adjust the flow rate to ensure that the pressure value of the pressure transmitter 10 is less than or equal to the oil circuit pressure limit value of the fuel cell stack 6. Turn on the electric heater 8. When the temperature of the fuel cell stack oil circuit inlet temperature sensor 7 is controlled to be 120°C, the fuel cell system can discharge electricity and complete a rapid startup. During the startup stage of this system, through the oil circuit path of the small cycle, the devices to be heated are reduced, the heat dissipation is reduced, and the beneficial effects of rapid temperature rise of the fuel cell stack 6 and rapid startup of the system are achieved.

[0033] As the system discharge power is amplified, when the temperature of the temperature sensor 5 at the outlet of the fuel cell stack oil circuit rises to 170°C, the system enters the stable operation stage. The electric heater 8 is turned off, and the electric three-way ball valve 8 is opened to connect the heat exchanger 12 in series to the oil circuit. The opening of the oil pump 11 is adjusted to ensure that the value of the flow sensor 9 is greater than the minimum flow required for heat exchange of the fuel cell stack 6, and the temperature difference between the inlet and outlet of the fuel cell stack oil circuit is less than 10°C. The cooling fan of the heat exchanger 12 is adjusted to ensure that the temperature of the temperature sensor 5 at the outlet of the fuel cell stack oil circuit is less than 180°C. In the stable operation stage of this system, through the oil circuit path of the large cycle, the heat exchanger 12 for heat regulation is added. By adjusting and matching the flow of the oil pump 11 and the heat dissipation of the heat exchanger 12, the temperature of the fuel cell stack 6 can be quickly adjusted, the temperature fluctuation can be reduced, and the stable output of the fuel cell system is realized. The electric heater 8 and the temperature sensors (5, 7) of this system are intelligently adjusted to ensure that there is no local overheating in the system, avoiding the coking and carbonization of the heat transfer oil and extending the service life of the system. This thermal management system is equipped with pressure 10, flow 9, and temperature (5, 7) monitoring devices, and has over-temperature and over-pressure protection functions to ensure the safe operation of the high-temperature fuel cell power generation system.

[0034] The beneficial effects that this application can produce include:

[0035] A high-temperature fuel cell thermal management system and its operation method provided by this application. In the startup stage of this system, through the oil circuit path of the small cycle, the components to be heated are reduced, the heat dissipation is reduced, and the beneficial effects of quickly raising the temperature of the fuel cell stack and quickly starting the system are realized; in the stable operation stage of this system, through the oil circuit path of the large cycle, the heat exchanger for heat regulation is added. By adjusting and matching the flow of the oil pump and the heat dissipation of the heat exchanger, the temperature of the fuel cell stack can be quickly adjusted, the temperature fluctuation can be reduced, and the stable output of the fuel cell system is realized; the electric heater and the temperature sensors of this system are intelligently adjusted to ensure that there is no local overheating in the system, avoiding the coking and carbonization of the heat transfer oil and extending the service life of the system. This thermal management system is equipped with pressure, flow, and temperature monitoring devices, and has over-temperature and over-pressure protection functions to ensure the safe operation of the high-temperature fuel cell power generation system. Description of the Drawings

[0036] Figure 1 It is a schematic diagram of a high-temperature fuel cell thermal management system provided by an embodiment of the present invention.

[0037] List of Components and Reference Numerals:

[0038] 1, pressure relief valve; 2, fuel tank; 3, stop valve; 4, electric three-way ball valve; 5, temperature sensor at the outlet of the fuel cell stack oil circuit; 6, fuel cell stack; 7, temperature sensor at the inlet of the fuel cell stack oil circuit; 8, electric heater; 9, flow sensor; 10, pressure transmitter; 11, oil pump; 12, heat exchanger. Detailed Embodiments

[0039] The present application will be described in detail below in conjunction with embodiments, but the present application is not limited to these embodiments.

[0040] Embodiment 1

[0041] This embodiment provides a thermal management for a high-temperature fuel cell. As Figure 1 shown, it includes an oil tank 2; the oil tank 2 is provided with a pressure relief valve 1 and a stop valve 3, and the oil tank 2 is connected to an oil pump 11 through an oil outlet pipeline; the outlet of the oil pump 11 is sequentially connected to a pressure transmitter 10, a flow sensor 9, and an electric heater 8; temperature sensors are respectively connected to the inlet 7 and outlet 5 of the heat-conducting oil of the fuel cell stack; the electric heater 8 is connected to the temperature sensor at the inlet of the heat-conducting oil of the fuel cell stack, and the 5 ends after the temperature sensor at the outlet of the heat-conducting oil of the fuel cell stack are divided into two paths, one path is connected to the stop valve 3, and the other path is connected to an electric three-way ball valve 4; one end of the electric three-way ball valve 4 is connected to the oil outlet pipeline of the oil tank, and the other end is connected to a heat exchanger 12; the outlet of the heat exchanger 12 is connected to the oil outlet pipeline of the oil tank;

[0042] In this embodiment, the oil tank 2 needs to be heat-resistant, and the material is stainless steel.

[0043] In this embodiment, the oil pump 11, the pressure transmitter 10, the flow sensor 9, the temperature sensors 5 and 7, and the electric three-way ball valve 4 can all withstand temperatures above 180 °C.

[0044] In this embodiment, the heat exchanger 12 is an air-cooled heat exchanger.

[0045] In this embodiment, the oil pipeline is a metal bellows.

[0046] Embodiment 2

[0047] An operation method of a high-temperature fuel cell thermal management system obtained based on Embodiment 1 is as follows:

[0048] During the system oil injection and exhaust stage, inject heat-conducting oil into the oil tank 2, and at the same time turn on the oil pump 11 to adjust the flow rate to ensure that the pressure value of the pressure transmitter 10 is less than or equal to the upper limit of the oil circuit pressure of the fuel cell stack 6. When the pressure value of the pressure transmitter 10 is basically unchanged, start the electric three-way valve 4 to switch the direction. At this time, the pressure transmitter value 10 becomes smaller, and continue to inject oil into the oil tank 2. When the pressure value of the pressure transmitter 10 is basically unchanged again, turn on the electric heater 8 and monitor the temperature of the temperature sensor 7 at the inlet of the oil circuit of the fuel cell stack. When it reaches 180 °C, stop the electric heater 8. At this time, the oil injection and exhaust of the thermal management system are completed, close the stop valve 3, and the overpressure gas in the oil tank is discharged from the pressure relief valve 1.

[0049] During the system startup phase, the inlet end of the initial position of the electric three-way valve 4 is connected to the temperature sensor 5 at the outlet of the fuel cell stack oil circuit, and the outlet end is connected to the fuel tank outlet oil pipe. The oil pump 11 is started to adjust the flow rate to ensure that the pressure value of the pressure transmitter 10 is less than or equal to the oil circuit pressure limit of the fuel cell stack 6. The electric heater 8 is started. When the temperature of the temperature sensor 7 at the inlet of the fuel cell stack oil circuit is controlled to be 120 °C, the fuel cell system can discharge. During the startup phase of this system, through the oil circuit path of the small cycle, the components to be heated are reduced, heat dissipation is reduced, and the beneficial effects of quickly heating the fuel cell stack 6 and quickly starting the system are achieved.

[0050] As the discharge power of the system increases, when the temperature at the outlet of the fuel cell stack oil circuit 5 rises to 170 °C, the system enters the stable operation phase. The electric heater 8 is turned off, and the electric three-way ball valve 8 is opened to connect the heat exchanger 12 in series into the oil circuit. The opening of the oil pump 11 is adjusted to ensure that the value of the flow sensor 9 is greater than the minimum flow required for heat exchange of the fuel cell stack 6, and the temperature difference between the inlet and outlet of the fuel cell stack oil circuit is less than 10 °C. The cooling fan of the heat exchanger 12 is adjusted to ensure that the temperature of the temperature sensor 5 at the outlet of the fuel cell stack oil circuit is less than 180 °C. During the stable operation phase of this system, through the oil circuit path of the large cycle, the heat exchanger 12 for heat regulation is added. By adjusting and matching the flow rate of the oil pump 11 and the heat dissipation of the heat exchanger 12, the temperature of the fuel cell stack 6 can be quickly adjusted, temperature fluctuations can be reduced, and stable output of the fuel cell system is achieved. The electric heater 8 of this system and the temperature sensors (5, 7) are intelligently adjusted to ensure that there is no local overheating in the system, avoid coking and carbonization of the heat transfer oil, and extend the service life of the system. This thermal management system is equipped with pressure 10, flow 9, temperature (5, 7) monitoring devices, and has over-temperature and over-pressure protection functions to ensure the safe operation of the high-temperature fuel cell power generation system.

[0051] The above are only several embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application is disclosed above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art, without departing from the scope of the technical solution of the present application, making some changes or modifications using the technical content disclosed above is equivalent to equivalent implementation cases and all belong to the scope of the technical solution.

Claims

1. A high-temperature fuel cell thermal management system, characterized in that, it includes an electric three-way ball valve, a fuel cell heat transfer oil outlet pipeline I connected to the inlet of the electric three-way ball valve, an oil tank outlet pipeline connected to the first controllable outlet of the electric three-way ball valve, and a heat exchanger inlet pipeline connected to the second controllable outlet of the electric three-way ball valve; it further includes an oil tank, an oil pump, a pressure transmitter, a flow sensor, an electric heater, a fuel cell heat transfer oil inlet temperature sensor, a fuel cell, a fuel cell heat transfer oil outlet temperature sensor, and a heat exchanger; the oil tank is connected to the inlet of the oil pump through the oil tank outlet pipeline; the outlet of the oil pump, the pressure transmitter, the flow sensor, the electric heater, the fuel cell heat transfer oil inlet temperature sensor, the fuel cell, and the fuel cell heat transfer oil outlet temperature sensor are connected in sequence; the fuel cell heat transfer oil outlet temperature sensor is connected to the fuel cell outlet pipeline; the fuel cell outlet pipeline includes the fuel cell heat transfer oil outlet pipeline I and the fuel cell heat transfer oil outlet pipeline II, the fuel cell heat transfer oil outlet pipeline II is connected to the oil tank, and a stop valve is provided on the fuel cell heat transfer oil outlet pipeline II; the heat exchanger inlet pipeline is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the oil tank outlet pipeline; the oil tank is provided with a pressure relief valve.

2. The high-temperature fuel cell thermal management system according to claim 1, characterized in that, the heat exchanger is an air-cooled heat exchanger and / or a water-cooled heat exchanger.

3. The high-temperature fuel cell thermal management system according to claim 1, characterized in that, the high-temperature fuel cell thermal management system further includes a control unit; the control unit is used to control the flow rate of the oil pump, control the pressure relief valve, the stop valve, the electric three-way ball valve, and the switch of the electric heater according to the monitoring results of at least one of the pressure transmitter, the flow sensor, the fuel cell heat transfer oil inlet temperature sensor, and the fuel cell heat transfer oil outlet temperature sensor.

4. A high-temperature fuel cell thermal management method, using the high-temperature fuel cell thermal management system according to any one of claims 1 to 3, characterized in that, the high-temperature fuel cell thermal management method includes: In the fuel cell oil injection and exhaust stage, control the first controllable outlet of the electric three-way ball valve to open and the second controllable outlet to close, inject heat transfer oil into the oil tank, start the oil pump, adjust the flow rate of the oil pump to ensure that the pressure value of the pressure transmitter ≤ the upper limit of the oil circuit pressure of the fuel cell. When the pressure value of the pressure transmitter is stable, control the second controllable outlet of the electric three-way ball valve to open, continue to inject oil into the oil tank. After the pressure value of the pressure transmitter is stable, start the electric heater, monitor the temperature of the fuel cell heat transfer oil inlet temperature sensor. When the temperature of the fuel cell heat transfer oil inlet temperature sensor reaches the operating temperature of the fuel cell, stop the electric heater, complete the oil injection and exhaust of the system, close the stop valve, and the overpressure gas in the oil tank is discharged from the pressure relief valve; During the start-up stage of the fuel cell, control the first controllable outlet of the electric three-way ball valve to open, the second controllable outlet to close, the stop valve to close, start the oil pump, adjust the flow rate of the oil pump to ensure that the pressure value of the pressure transmitter ≤ the upper limit of the oil circuit pressure of the fuel cell stack, start the electric heater, and when the temperature of the fuel cell stack heat transfer oil inlet temperature sensor reaches the fuel cell discharge temperature, the fuel cell discharges. When the temperature of the fuel cell stack heat transfer oil outlet temperature sensor rises to 170 °C, the fuel cell enters the operation stage; During the operation stage of the fuel cell, turn off the electric heater, control the first controllable outlet of the electric three-way ball valve to open and the second controllable outlet to open, connect the heat exchanger in series to the oil circuit, and by adjusting the opening of the oil pump, ensure that the flow value of the flow sensor > the minimum value of the flow required for fuel cell stack heat exchange, the temperature difference between the inlet and outlet of the fuel cell stack oil circuit is less than 10 °C, and adjust the heat exchanger to ensure that the temperature of the fuel cell stack heat transfer oil outlet temperature sensor is less than 180 °C.

5. The high-temperature fuel cell thermal management method according to claim 4, characterized in that, the operating temperature of the fuel cell stack is 160 - 200 °C.

6. The high-temperature fuel cell thermal management method according to claim 4, characterized in that, the fuel cell stack discharge temperature is 120 °C.

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