Fuel cell cathode gas supply structure and fuel cell system thereof

Abstract

The utility model discloses a kind of fuel cell cathode gas supply structure and fuel cell system thereof, the fuel cell cathode gas supply structure includes electric pile, air compressor and first heat exchange area;Air compressor has high-pressure air outlet and energy recovery end;First heat exchange area has first air inlet passage and first heat exchange passage;The high-pressure air outlet of air compressor and the first air inlet passage of first heat exchange area are sequentially communicated, and high-pressure gas supply flow path is formed in common;The first heat exchange passage of first heat exchange area and the energy recovery end of air compressor are sequentially connected, and low-pressure gas heat exchange flow path is formed in common, the two ends of high-pressure gas supply flow path and low-pressure gas heat exchange flow path are connected by electric pile and air compressor respectively, to form first circulation loop. To realize the energy generated in the working of cathode gas supply system effectively circulation, recycling, can greatly reduce the power consumption of cathode gas supply system, and effectively improve the working efficiency of fuel cell system.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, specifically to a fuel cell cathode gas supply structure and its fuel cell system. Background Technology

[0002] Hydrogen energy is a major strategic energy source for global energy structure upgrading and power transformation, and fuel cells, as one of the best ways to apply hydrogen energy, have received widespread attention. Among them, the cathode gas supply system of a fuel cell is one of the core functional systems of the fuel cell system, providing the high-pressure air required for the chemical reaction of the fuel cell.

[0003] However, existing cathode gas supply systems are usually unable to effectively utilize the energy generated during operation, resulting in a large amount of energy consumption. This makes the cathode gas supply system one of the largest energy-consuming components of the fuel cell system, with its parasitic power accounting for 15-25% of the stack power, which seriously affects the utilization efficiency of fuel cell power generation. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a fuel cell cathode gas supply structure and its fuel cell system to solve the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A fuel cell cathode gas supply structure includes:

[0007] fuel cell stack;

[0008] An air compressor has a high-pressure air outlet and an energy recovery end;

[0009] The first heat exchange zone has a first air intake passage and a first heat exchange passage;

[0010] The high-pressure air outlet of the air compressor and the first air inlet passage of the first heat exchange zone are connected in sequence and together form a high-pressure gas supply path, which is used to supply high-temperature and high-pressure gas to the fuel cell stack.

[0011] The first heat exchange passage of the first heat exchange zone and the energy recovery end of the air compressor are connected in sequence and together form a low-pressure gas heat exchange flow path. The low-pressure gas heat exchange flow path is used to recover the gas discharged by the fuel cell stack and exchange heat with the high-temperature and high-pressure gas transported by the high-pressure gas supply flow path in the first heat exchange zone.

[0012] The two ends of the high-pressure gas supply path and the low-pressure gas heat exchange path are respectively connected through the fuel cell stack and the air compressor to form a first circulation loop.

[0013] In one embodiment, a second heat exchange zone is also included.

[0014] The second heat exchange zone has a second air intake passage and a second heat exchange passage.

[0015] The high-pressure gas supply path is connected to the fuel cell stack through the second air inlet passage;

[0016] The second heat exchange passage is used to connect to an external heat exchange supply system to exchange heat with the gas passing through the second intake passage.

[0017] In one embodiment, the air compressor further has an air compression end connected to an air supply channel. The air compression end is used to compress the air supplied by the air supply channel to obtain high-temperature and high-pressure gas, which enters the high-pressure gas supply path through the high-pressure air outlet.

[0018] In one embodiment, the air compressor is provided with a compression impeller at the air compression end.

[0019] In one embodiment, the air compressor has an energy recovery end equipped with a recovery turbine for recovering the gas discharged from the fuel cell stack.

[0020] In one embodiment, a low-pressure gas recovery passage is also included. One end of the first heat exchange passage of the first heat exchange zone and one end of the low-pressure gas recovery passage are respectively connected to the gas outlet of the fuel cell stack via a three-way solenoid valve, and the other end of the low-pressure gas recovery passage is connected to the energy recovery end of the air compressor.

[0021] In one embodiment, a second temperature sensor is provided between the high-pressure air outlet of the air compressor and the first air inlet passage of the first heat exchange zone;

[0022] A fifth temperature sensor is also installed between the gas outlet of the fuel cell stack and the three-way solenoid valve.

[0023] In one embodiment, a humidifier is also included, and the second air intake passage of the second heat exchange zone is connected to the fuel cell stack through the humidifier, and the fuel cell stack is connected to the three-way solenoid valve through the humidifier.

[0024] In one embodiment, a pressure regulating valve is also provided between the fuel cell stack and the humidifier.

[0025] A fuel cell system includes a fuel cell cathode gas supply structure as described in any of the above claims.

[0026] Compared with existing technologies, the beneficial effects of this utility model are as follows:

[0027] The high-pressure gas supply path provides high-temperature, high-pressure gas to the fuel cell stack, ensuring stable operation. A low-pressure gas heat exchange path effectively centralizes the exhaust gas and exchanges heat with the high-pressure, high-temperature gas in the high-pressure gas supply path, ensuring the gas supplied meets the stack's operational requirements. The exhaust gas is then transported to the air compressor's energy recovery end after heat exchange through the low-pressure gas heat exchange path. Connecting the high-pressure gas supply path and the low-pressure gas heat exchange path to the fuel cell stack and the air compressor respectively forms a first circulation loop. This effectively recycles and recovers the energy generated during the cathode gas supply system's operation, significantly reducing power consumption and improving fuel cell system efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the working principle of a fuel cell cathode gas supply structure according to one embodiment of the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the working principle of the first and second heat exchange zones in the circuit.

[0030] In the diagram: 1. Air supply channel; 101. Filter; 102. Flow meter; 103. First pressure sensor; 104. First temperature sensor; 2. Air compressor; 201. Air compression end; 202. Energy recovery end; 203. Second temperature sensor; 3. Secondary heat exchanger; 301. First air inlet; 302. Second air outlet; 303. First heat exchange inlet; 304. First heat exchange outlet; 305. Three-way solenoid valve; 306. 307. Low-pressure gas recovery passage; 308. Fifth temperature sensor; 309. Second heat exchange zone; 310. Second heat exchange inlet; 311. Second heat exchange outlet; 312. First heat exchange zone; 313. First air intake passage; 314. First heat exchange passage; 315. Exhaust pipe; 4. Humidifier; 5. Fuel cell stack; 501. Fourth temperature sensor; 502. Second pressure sensor; 6. Pressure regulating valve; 7. Exhaust passage; 701. Silencer. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] like Figures 1 to 2 As shown, the present invention provides a fuel cell cathode gas supply structure, comprising:

[0033] fuel cell stack 5;

[0034] Air compressor 2 has a high-pressure air outlet and an energy recovery end 202;

[0035] The first heat exchange zone 311 has a first air intake passage 312 and a first heat exchange passage 313;

[0036] Among them, the high-pressure air outlet of the air compressor 2 and the first air inlet passage 312 of the first heat exchange zone 311 are connected in sequence and together form a high-pressure gas supply flow path, which is used to supply high-temperature and high-pressure gas to the fuel cell stack 5.

[0037] The first heat exchange passage 313 of the first heat exchange zone 311 and the energy recovery end 202 of the air compressor 2 are connected in sequence and together form a low-pressure gas heat exchange flow path. The low-pressure gas heat exchange flow path is used to recover the gas discharged from the fuel cell stack 5 and exchange heat with the high-temperature and high-pressure gas transported by the high-pressure gas supply flow path in the first heat exchange zone 311.

[0038] The two ends of the high-pressure gas supply path and the low-pressure gas heat exchange path are connected to the electric stack 5 and the air compressor 2 respectively to form the first circulation loop.

[0039] In this embodiment, a high-pressure gas supply path is used to supply high-temperature and high-pressure gas to the fuel cell stack 5, ensuring stable operation of the stack 5. A low-pressure gas heat exchange path is also provided, which not only effectively concentrates the gas discharged from the stack 5 but also exchanges heat between the discharged gas and the high-pressure, high-temperature gas in the high-pressure gas supply path, ensuring that the gas supplied to the stack 5 meets its operational requirements. The gas discharged from the stack 5 is then transported to the energy recovery end 202 of the air compressor 2 after heat exchange through the low-pressure gas heat exchange path. The high-pressure gas supply path and the low-pressure gas heat exchange path are connected at both ends via the stack 5 and the air compressor 2, respectively, forming a first circulation loop. This effectively recycles and recovers the energy generated during the operation of the cathode gas supply system, significantly reducing power consumption and improving the efficiency of the fuel cell system.

[0040] It should be noted that since the operating temperature of the fuel cell stack 5 is below 80℃, the temperature of its exhaust gas is even lower. After passing through the pressure regulating valve 6, humidifier 4, and other stages, the exhaust gas temperature is often less than 60℃, which greatly reduces the recoverable energy of the exhaust gas. On the other hand, the temperature of the high-pressure air outlet of the air compressor 2 often reaches above 180℃. In order to achieve the inlet temperature of below 80℃ required by the fuel cell stack 5, a large amount of coolant is often required for cooling, resulting in high cooling energy consumption. Therefore, this utility model uses a high-pressure gas supply flow path and a low-pressure gas heat exchange flow path for heat exchange, and connects them at both ends of the air compressor 2 and the fuel cell stack 5 to achieve energy recycling, which can effectively reduce the overall energy consumption.

[0041] like Figures 1 to 2 As shown, in one embodiment, a second heat exchange zone 308 is also included.

[0042] The second heat exchange zone 308 has a second air intake passage and a second heat exchange passage.

[0043] The high-pressure gas supply path is connected to the fuel cell stack 5 through the second air inlet passage;

[0044] The second heat exchange passage is used to connect to an external heat supply system to exchange heat with the gas passing through the second intake passage.

[0045] In this embodiment, by adding a first heat exchange zone 311 and a second heat exchange zone 308 between the air compressor 2 and the fuel cell stack 5, the high-temperature, high-pressure gas discharged from the high-pressure air outlet of the air compressor 2 is used to heat the exhaust gas emitted by the fuel cell stack 5. This increases the recoverable energy of the exhaust gas and reduces the energy consumption required to cool the high-temperature, high-pressure gas, thereby significantly reducing overall energy consumption, achieving efficient energy recycling, and improving overall working efficiency. Furthermore, by using the first heat exchange zone 311 and the second heat exchange zone 308 in conjunction, a refined, hierarchical, and multi-stage temperature control effect is achieved for the high-temperature, high-pressure gas supplied to the fuel cell stack 5 through the high-pressure gas supply path, ensuring the operational stability of the fuel cell stack 5.

[0046] Depending on the requirements, the first heat exchange zone 311 is a gas-to-gas heat exchange zone, and the second heat exchange zone 308 can be a gas-to-liquid heat exchange zone. The first heat exchange zone 311 and the second heat exchange zone 308 are located between the air compressor 2 and the fuel cell stack 5. On one hand, the high-temperature, high-pressure gas discharged from the high-pressure air outlet of the air compressor 2 passes sequentially through the first heat exchange zone 311 and the second heat exchange zone 308 before entering the fuel cell stack 5. On the other hand, the exhaust gas discharged from the fuel cell stack 5 can flow back to the energy recovery end 202 of the air compressor 2 through the first heat exchange zone 311, thus achieving heat exchange and recycling.

[0047] The first heat exchange zone 311 is located near the high-pressure air outlet of the air compressor 2. The first air intake passage 312 and the first heat exchange passage 313 are alternately arranged in the first heat exchange zone 311. As needed, a first preset number of heat exchange plates are arranged between the first air intake passage 312 and the first heat exchange passage 313 in the first heat exchange zone 311 so that the high-temperature and high-pressure gas entering the first air intake passage 312 and the low-temperature and low-pressure gas discharged from the fuel cell 5 and entering the first heat exchange passage 313 can have sufficient heat exchange in this area.

[0048] The second heat exchange zone 308 is located near the air inlet of the fuel cell stack 5. The second heat exchange passage of the second heat exchange zone 308 is provided with a second heat exchange inlet 309 and a second heat exchange outlet 310. As needed, a second preset number of heat exchange plates are provided between the second air inlet passage and the second heat exchange passage of the second heat exchange zone 308 so that the high-temperature and high-pressure gas entering the second air inlet passage and the coolant entering the second heat exchange passage can fully exchange heat, thereby cooling the high-temperature and high-pressure gas discharged from the first heat exchange zone 311 so that the high-temperature and high-pressure gas passing through the second heat exchange zone 308 meets the fuel cell inlet temperature requirements.

[0049] Depending on the needs, the first heat exchange zone 311 and the second heat exchange zone 308 can also jointly form a secondary heat exchanger 3, thereby achieving an integrated multi-stage heat exchange effect. It should be noted that the first heat exchange zone 311 and the second heat exchange zone 308 can separately or simultaneously exchange heat and cool down the high-temperature and high-pressure gas delivered by the air compressor 2, depending on the actual situation, to ensure operational stability.

[0050] It should be understood that the first air intake passage 312 has a first air inlet 301 and a first air outlet, and the first heat exchange passage 313 has a first heat exchange inlet 303 and a first heat exchange outlet 304. The second air intake passage has a second air inlet and a second air outlet 302, and the second heat exchange passage has a second heat exchange inlet 309 and a second heat exchange outlet 310.

[0051] like Figure 1 As shown, in one embodiment, the air compressor 2 further has an air compression end 201, which is connected to the air supply channel 1. The air compression end 201 is used to compress the air supplied by the air supply channel 1 to obtain high temperature and high pressure gas and enter the high pressure gas supply path through the high pressure air outlet.

[0052] In this embodiment, the air compressor 201 is connected to the air supply channel 1 to replenish the fuel cell stack 5 with high-temperature and high-pressure gas in a timely manner, so as to ensure the working stability of the fuel cell stack 5.

[0053] As needed, the air supply channel 1 is equipped with one or more of the following: a filter 101, a flow meter 102, a first pressure sensor 103, and a first temperature sensor 104. This allows the subsequent air compressor 2 to operate based on the detection results of one or more of the following: the flow meter 102, the first pressure sensor 103, and the first temperature sensor 104, thereby achieving a refined operating effect.

[0054] In one embodiment, the air compression end 201 of the air compressor 2 is provided with a compression impeller.

[0055] In this embodiment, by setting a compression impeller at the air compression end 201 of the air compressor 2, the air transported in the air supply channel 1 is compressed to obtain high-temperature and high-pressure gas, which enters the first air intake passage 312 of the first heat exchange zone 311 through the high-pressure air outlet, so as to provide high-temperature and high-pressure gas to the fuel cell stack 5 in a timely manner and ensure the working stability of the fuel cell stack 5.

[0056] In one embodiment, the energy recovery end 202 of the air compressor 2 is provided with a recovery turbine for recovering the gas discharged from the fuel cell stack 5.

[0057] In this embodiment, a recovery turbine is installed at the energy recovery end 202 of the air compressor 2 to recover and utilize the energy of the exhaust gas with a certain pressure and temperature discharged from the fuel cell stack 5. This allows the high-temperature and high-pressure gas to be output through the air compression end 201 and / or high-pressure air outlet of the air compressor 2 as needed to supply the operation of the fuel cell stack 5, thereby reducing the energy consumption of the air compressor 2 and improving the overall working efficiency.

[0058] Depending on the needs, the recovery turbine and the compression impeller can be arranged coaxially. Alternatively, the recovery turbine and the compression impeller can be respectively installed on both sides of the motor of the air compressor 2. The recovered energy is directly fed back to the air compressor 2 through the recovery turbine, thereby reducing the power consumption of the air compressor 2.

[0059] As needed, the energy recovery end 202 of the air compressor 2 is also connected to an exhaust passage 7. The exhaust passage 7 is used to discharge the exhaust gas emitted by the fuel cell stack 5 that does not meet the recovery standards. A silencer 701 is installed on the exhaust passage 7.

[0060] like Figure 1 As shown, in one embodiment, a low-pressure gas recovery passage 306 is also included. One end of the first heat exchange passage 313 of the first heat exchange zone 311 and the low-pressure gas recovery passage 306 are respectively connected to the gas outlet of the fuel cell stack 5 through a three-way solenoid valve 305, and the other end of the low-pressure gas recovery passage 306 is connected to the energy recovery end 202 of the air compressor 2.

[0061] In this embodiment, the two ends of the high-pressure gas supply path and the low-pressure gas recovery path 306 are respectively connected to the fuel cell stack 5 and the air compressor 2 to form a second circulation loop. The three-way solenoid valve 305 is used to control the fuel cell stack 5 to connect with the first heat exchange path 313 of the first heat exchange zone 311 or to control the fuel cell stack 5 to connect with the low-pressure gas recovery path 306, so that the cathode gas supply structure switches to the first circulation loop or the second circulation loop to perform the operation.

[0062] like Figure 1 As shown, in one embodiment, a second temperature sensor 203 is provided between the high-pressure air outlet of the air compressor 2 and the first air intake passage 312 of the first heat exchange zone 311.

[0063] A fifth temperature sensor 307 is also installed between the air outlet of fuel cell stack 5 and the three-way solenoid valve 305.

[0064] In this embodiment, by setting a second temperature sensor 203 and a fifth temperature sensor 307, the three-way solenoid valve 305 controls the fuel cell stack 5 to connect with the first heat exchange passage 313 of the first heat exchange zone 311 or controls the fuel cell stack 5 to connect with the low-pressure gas recovery passage 306 based on the detection results of the second temperature sensor 203 and the fifth temperature sensor 307, so that the cathode gas supply structure switches to the first circulation loop or the second circulation loop to perform operation.

[0065] For example, when the fuel cell system is working, the second temperature sensor 203, which is arranged between the high-pressure air outlet of the air compressor 2 and the first air inlet 301 of the first air inlet passage 312 of the first heat exchange zone 311, detects that the compressed air temperature is T2, and the fifth temperature sensor 307, which is arranged between the humidifier 4 and the three-way solenoid valve 305, detects that the compressed air temperature is T5.

[0066] On the one hand, when the fuel cell system is operating at a higher power range, the air compressor 2 has a large flow rate and a high pressure ratio, and the temperature T2 > T5. The high-temperature and high-pressure gas from the high-pressure air outlet of the air compressor 2 has a heating effect on the low-temperature and low-pressure gas discharged from the fuel cell stack 5 to the first heat exchange passage 313 of the first heat exchange zone 311. At this time, by controlling the three-way solenoid valve 305 to switch to the first circulation loop, the exhaust pipe 314 is connected to the first heat exchange passage 313 of the first heat exchange zone 311. The exhaust gas discharged from the fuel cell stack 5 enters the first heat exchange passage 313 of the first heat exchange zone 311 and undergoes heat exchange with the high-temperature and high-pressure gas in the first intake passage 312 in the first heat exchange zone 311, thereby increasing the temperature of the exhaust gas discharged from the fuel cell stack 5 and increasing the recoverable energy of the exhaust gas. At the same time, through heat exchange, the temperature of the high-temperature and high-pressure gas in the first intake passage 312 is reduced, thereby reducing the load on the water-cooled part of the second heat exchange zone 308, achieving the dual effect of improving the efficiency of the fuel cell system.

[0067] On the other hand, when the fuel cell system is operating in the low power range, the air compressor 2 has a small flow rate and a low pressure ratio, so the temperature T2≤T5. At this time, the high temperature and high pressure gas at the high pressure air outlet of the air compressor 2 does not have a heating effect on the recovered exhaust gas discharged from the fuel cell stack 5, or even a cooling effect. Therefore, the three-way solenoid valve 305 is controlled to switch to the second circulation loop, so that the exhaust pipe 314 is connected to the low pressure gas recovery passage 306. The exhaust gas discharged from the fuel cell stack 5 flows directly back to the energy recovery end 202 of the air compressor 2 through the low pressure gas recovery passage 306, without passing through the first heat exchange passage 313 of the first heat exchange zone 311, thereby avoiding the loss of exhaust gas energy.

[0068] like Figure 1 As shown, in one embodiment, a humidifier 4 is also included. The second air intake passage of the second heat exchange zone 308 is connected to the fuel cell stack 5 through the humidifier 4. The fuel cell stack 5 is connected to the three-way solenoid valve 305 through the humidifier 4.

[0069] In this embodiment, a humidifier 4 is provided to ensure that the gas supplied to the fuel cell stack 5 meets the working requirements of the fuel cell stack 5 and ensures working stability.

[0070] If necessary, a third temperature sensor may be installed between the second heat exchange zone 308 and the humidifier 4, and a fourth temperature sensor 501 and a second pressure sensor 502 may be installed between the humidifier 4 and the fuel cell stack 5.

[0071] like Figure 1 As shown, in one embodiment, a pressure regulating valve 6 is also provided between the fuel cell stack 5 and the humidifier 4.

[0072] In this embodiment, a pressure regulating valve 6 is used to regulate the pressure of the gas discharged from the fuel cell stack 5, ensuring operational stability.

[0073] A fuel cell system comprising a fuel cell cathode gas supply structure as described above.

[0074] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A fuel cell cathode gas supply structure, characterized in that, include: fuel cell stack; An air compressor has a high-pressure air outlet and an energy recovery end; The first heat exchange zone has a first air intake passage and a first heat exchange passage; The high-pressure air outlet of the air compressor and the first air inlet passage of the first heat exchange zone are connected in sequence and together form a high-pressure gas supply path, which is used to supply high-temperature and high-pressure gas to the fuel cell stack. The first heat exchange passage of the first heat exchange zone and the energy recovery end of the air compressor are connected in sequence and together form a low-pressure gas heat exchange flow path. The low-pressure gas heat exchange flow path is used to recover the gas discharged by the fuel cell stack and exchange heat with the high-temperature and high-pressure gas transported by the high-pressure gas supply flow path in the first heat exchange zone. The two ends of the high-pressure gas supply path and the low-pressure gas heat exchange path are respectively connected through the fuel cell stack and the air compressor to form a first circulation loop.

2. The fuel cell cathode gas supply structure according to claim 1, characterized in that, It also includes a second heat exchange zone. The second heat exchange zone has a second air intake passage and a second heat exchange passage. The high-pressure gas supply path is connected to the fuel cell stack through the second air inlet passage; The second heat exchange passage is used to connect to an external heat exchange supply system to exchange heat with the gas passing through the second intake passage.

3. The fuel cell cathode gas supply structure according to claim 1, characterized in that, The air compressor also has an air compression end, which is connected to the air supply channel. The air compression end is used to compress the air supplied by the air supply channel to obtain high-temperature and high-pressure gas, which enters the high-pressure gas supply path through the high-pressure air outlet.

4. The fuel cell cathode gas supply structure according to claim 3, characterized in that, The air compressor is equipped with a compression impeller at the air compression end.

5. The fuel cell cathode gas supply structure according to claim 4, characterized in that, The air compressor is equipped with a recovery turbine at its energy recovery end, which is used to recover the gas discharged from the fuel cell stack.

6. The fuel cell cathode gas supply structure according to claim 2, characterized in that, It also includes a low-pressure gas recovery passage. One end of the first heat exchange passage of the first heat exchange zone and one end of the low-pressure gas recovery passage are respectively connected to the gas outlet of the fuel cell stack through a three-way solenoid valve. The other end of the low-pressure gas recovery passage is connected to the energy recovery end of the air compressor.

7. The fuel cell cathode gas supply structure according to claim 6, characterized in that, A second temperature sensor is installed between the high-pressure air outlet of the air compressor and the first air inlet passage of the first heat exchange zone. A fifth temperature sensor is also installed between the gas outlet of the fuel cell stack and the three-way solenoid valve.

8. A fuel cell cathode gas supply structure according to claim 6, characterized in that, It also includes a humidifier, the second air intake passage of the second heat exchange zone is connected to the fuel cell stack through the humidifier, and the fuel cell stack is connected to the three-way solenoid valve through the humidifier.

9. A fuel cell cathode gas supply structure according to claim 8, characterized in that, A pressure regulating valve is also provided between the fuel cell stack and the humidifier.

10. A fuel cell system, characterized in that, Includes a fuel cell cathode gas supply structure as described in any one of claims 1-9.

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