Cathode control valve and fuel cell system

Abstract

The utility model discloses a cathode control valve and a fuel cell system, the cathode control valve comprises: a first housing comprising a first cavity, the first cavity comprising an air inlet and an air outlet which are arranged at an interval; the disc is arranged in the first cavity and can be switched between a first state and a second state; the control box comprises a second cavity and a control part, the control part is arranged in the second cavity, the control part is connected with the disc and used for enabling the disc to be switched between a first state and a second state, the air inlet and the air outlet are communicated in the first state, and the air inlet and the air outlet are not communicated in the second state; and the through hole communicates with the atmosphere, the through hole is formed between the control box and the first shell, the control box and the first shell jointly define the through hole, the through hole is used for separating the first cavity from the second cavity, and the first cavity does not communicate with the second cavity. Impurities such as water vapor can be prevented from entering the control box, and electronic components such as a motor in the control box are prevented from being corroded by the impurities.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, especially a kind of cathode control valve and fuel cell system. BACKGROUND

[0002] Fuel cell is a kind of chemical device that converts the chemical energy of fuel into electric energy, also called electrochemical generator, fuel cell has the advantages of high fuel energy conversion rate, low noise and zero emission, can be widely applied to automobile, aircraft, train and other vehicles and fixed power station etc.

[0003] Fuel cell system is usually composed of fuel cell stack, reaction gas source etc. The cathode control valve in fuel cell is a key component for controlling and regulating the air flow of fuel cell cathode. It helps to maintain the ideal working state of the battery, thereby improving the efficiency and life of the battery.

[0004] In the prior art, the ventilation cavity of the cathode control valve is communicated with the control box, and the disc in the ventilation cavity is driven to rotate by the driving component in the control box, so as to adjust the hydrogen flow on the cathode side. However, since the gas provided by the hydrogen source usually includes impurities such as water vapor, in the use process of the cathode control valve, impurities such as water vapor are easy to enter the control box through the ventilation cavity, especially in some working conditions, the pressure in the ventilation cavity is higher than that in the control box, and impurities such as water vapor are more likely to enter the control box, causing the electronic components such as motor and sensor in the control box to be corroded, affecting the normal work of the valve body. SUMMARY

[0005] The utility model discloses a kind of cathode control valves, no matter in any working condition, impurities such as water vapor can be avoided entering control box as far as possible, avoid the corrosion of electronic components such as motor and sensor in control box by impurities.

[0006] To solve the above technical problems, the embodiment of the utility model discloses a kind of cathode control valve, comprising:

[0007] First housing, including first cavity, the first cavity includes spaced apart gas inlet and gas outlet;

[0008] Disc, the disc is located in the first cavity, can be switched between first state and second state;

[0009] The control box comprises a second cavity and a control part arranged in the second cavity, the control part is connected with the disc for switching the disc between the first state and the second state, in the first state, the air inlet and the air outlet are in communication, in the second state, the air inlet and the air outlet are not in communication.

[0010] The through hole is arranged between the control box and the first shell, and the control box and the first shell jointly enclose the through hole, the first cavity is separated from the second cavity, and the first cavity is not in communication with the second cavity.

[0011] The first cavity is not in communication with the second cavity, compared with the prior art, the first cavity is in communication with the second cavity, and the sealing element is arranged between the first cavity and the second cavity, when the pressure in the first cavity is relatively large, the sealing element is prone to failure, so that water vapor and impurities enter the second cavity, in order to avoid impurities entering the second cavity, the performance of the sealing element is improved, on the one hand, the cost is increased, and on the other hand, even if the performance of the sealing element is good, when the pressure in the first cavity is too large, the sealing element is still prone to failure. The above technical scheme of the present application separates the first cavity from the second cavity by arranging the through hole between the control box and the first shell, so that the first cavity and the second cavity become two spaces that are not connected with each other, and since the through hole is in communication with the atmosphere, the first cavity and the second cavity are not directly connected, so that even if the first cavity leaks (for example, the sealing element fails), water vapor and impurities will directly enter the atmosphere, and will not enter the second cavity, so that the motor, sensor and other electronic components in the control box can be prevented from being corroded by impurities.

[0012] According to another specific embodiment of the present application, the embodiment of the present application discloses a cathode control valve, the control part comprises a rotating shaft, the air inlet and the air outlet are arranged at intervals along the radial direction of the rotating shaft, and the rotating shaft sequentially penetrates the control box, the through hole, the first shell and is connected with the disc along the axial direction.

[0013] According to another specific embodiment of the present application, the embodiment of the present application discloses a cathode control valve, comprising a first sealing part and a second sealing part, the first shell comprises a first through hole, the control box comprises a second through hole, the first through hole and the second through hole are oppositely arranged along the axial direction, the first sealing part is arranged in the first through hole, the second sealing part is arranged in the second through hole, and the rotating shaft sequentially penetrates the second through hole, the through hole, the first through hole and is connected with the disc.

[0014] According to the technical scheme, since the through hole is communicated with the atmosphere, the second sealing part only needs to ensure the sealing between the second cavity and the through hole, that is, the second sealing part is only impacted by the atmospheric pressure, and thus the performance requirement of the second sealing part can be appropriately reduced, and the cost can be correspondingly reduced.

[0015] According to another specific embodiment of the utility model, the utility model discloses an embodiment of a cathode control valve, the first sealing part includes the first sealing ring, the first sealing ring is sleeved in the rotating shaft, and the first sealing ring is in abutment with the first hole wall of the first through hole.

[0016] According to another specific embodiment of the utility model, the utility model discloses an embodiment of a cathode control valve, the second sealing part includes the second sealing ring and the bearing, along the axial direction, the bearing is arranged on the side of the second sealing ring towards the second cavity, and the second sealing ring and the bearing are sleeved in the rotating shaft and in abutment with the second hole wall of the second through hole.

[0017] According to another specific embodiment of the utility model, the utility model discloses an embodiment of a cathode control valve, the control part includes the motor and the multi-stage gear transmission mechanism, the multi-stage gear transmission mechanism includes the first gear and the second gear, the motor is connected with the first gear, the first gear and the second gear are engaged, the second gear is connected with the rotating shaft, and the rotating shaft is driven to rotate to switch the disc between the first state and the second state.

[0018] According to the technical scheme, the power is transmitted through the multi-stage gear mechanism, and the rotation of the rotating shaft can be more stable and accurate.

[0019] According to another specific embodiment of the utility model, the utility model discloses an embodiment of a cathode control valve, the multi-stage gear transmission mechanism further includes the third gear and the fourth gear, the end face of the fourth gear coincides with the end face of the third gear, the pitch circle diameter of the fourth gear is less than the pitch circle diameter of the third gear, the third gear is engaged with the first gear, and the fourth gear is engaged with the second gear.

[0020] According to another specific embodiment of the utility model, the utility model discloses an embodiment of a cathode control valve, the control part includes the reset elastic member, the reset elastic member is arranged on the end face of the second gear, the reset elastic member can be switched between the compressed state and the reset state, in the first state, the reset elastic member is in the compressed state, and in the second state, the reset elastic member is in the reset state.

[0021] With the technical scheme, the reset elastic member is arranged at the end face of the third gear, the reset elastic member can be switched between a compressed state and a reset state, when the disc is in the first state, the reset elastic member is in the compressed state, when the cathode control valve suddenly fails (for example, the motor suddenly loses power), the reset elastic member is kept in the compressed state due to the loss of continuous external force, and thus the reset elastic member returns to the reset state, so that the disc is switched to the second state, the first cavity is closed, and the cathode control valve can accurately regulate the gas flow.

[0022] According to another specific embodiment of the present application, the embodiment of the present application discloses a cathode control valve, the second gear comprises a first protruding part, and the first protruding part is circumferentially arranged at the end face of the second gear, and the reset elastic member is circumferentially arranged at the side face of the first protruding part.

[0023] The embodiment of the present application further discloses a fuel cell system, the fuel cell system at least comprises:

[0024] The cathode control valve in any of the above-mentioned embodiments;

[0025] The fuel cell stack comprises a cathode and an anode, the cathode is connected with the gas outlet of the cathode control valve;

[0026] The reaction gas source is connected with the gas inlet of the cathode control valve;

[0027] The fuel gas source is connected with the anode. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A schematic diagram of a fuel cell provided by the embodiment of the present application is shown.

[0029] Figure 2 A three-dimensional schematic diagram of a cathode control valve provided by the embodiment of the present application is shown.

[0030] Figure 3 A side sectional view of a cathode control valve provided by the embodiment of the present application is shown.

[0031] Figure 4 A front sectional view of a cathode control valve provided by the embodiment of the present application is shown.

[0032] Figure 5 An explosion diagram of a cathode control valve provided by the embodiment of the present application is shown.

[0033] Figure 6 A schematic diagram of a cathode control valve provided by the embodiment of the present application is shown.

[0034] Figure 7A simplified schematic view of the third gear and the fourth gear of the cathode control valve is shown. DETAILED DESCRIPTION

[0035] The other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification. Although the present application will be described in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of describing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a better understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0036] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] The terms "first", "second", etc. are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present embodiment, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0040] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail in combination with the drawings.

[0041] In some embodiments, referring to Figure 1 , the embodiments of the present application provide a fuel cell system, comprising a fuel cell stack, a cathode control valve, a reaction gas source and a fuel gas source, the cathode of the fuel cell stack is connected with the gas outlet of the cathode control valve, the reaction gas source is connected with the gas inlet of the cathode control valve, the reaction gas source is used for providing oxygen (or air) for the fuel cell stack, the anode of the fuel cell stack is connected with the fuel gas source, and the fuel gas source is used for providing hydrogen for the fuel cell stack. After the oxygen (or air) enters the fuel cell stack through the cathode, the hydrogen molecules of the anode are decomposed into two protons and two electrons through the action of the catalyst, and the electrons reach the cathode through the external circuit to form a current.

[0042] In some embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 , the cathode control valve comprises a first shell 10, a disc 20, a control box 30 and a through hole 40. The first shell 10 comprises a first cavity 11, and the first cavity 11 comprises a gas inlet 111 and a gas outlet 112 arranged at intervals along a first direction X. The disc 20 is arranged in the first cavity 11 and can be switched between a first state and a second state. Exemplarily, the first shell 10 is arranged in a hollow cylindrical shape, and the disc 20 is arranged in a disc shape. Understandably, the shape of the disc 20 and the first shell 10 is not limited in the embodiments of the present application, for example, the disc 20 can be rectangular.

[0043] Exemplarily, along a second direction Y, the control box 30 is arranged on one side of the first shell 10, the through hole 40 is arranged between the control box 30 and the first shell 10, the control box 30 comprises a second cavity 31 and a control part 32, the control part 32 is arranged in the second cavity 31, the control part 32 is connected with the disc 20 and is used for switching the disc 20 between the first state and the second state. In the first state, the gas inlet 111 and the gas outlet 112 are conductive, the first cavity 11 is open, and the oxygen (or air) provided by the reaction gas source is introduced into the fuel cell stack; in the second state, the gas inlet 111 and the gas outlet 112 are not conductive, the first cavity 11 is closed, and the oxygen (or air) provided by the reaction gas source stops being introduced into the fuel cell stack. The through hole 40 is in communication with the atmosphere, the through hole 40 is arranged between the control box 30 and the first shell 10, the control box 30 and the first shell 10 jointly enclose the through hole 40, and the first cavity 11 is separated from the second cavity 31, and the first cavity 11 is not in communication with the second cavity 31. Exemplarily, the through hole 40 penetrates the joint of the first shell 10 and the control box 30 in the first direction X, and both sides of the through hole 40 in the first direction X are in communication with the atmosphere.

[0044] With the technical scheme, the first cavity 11 is not communicated with the second cavity 31, compared with the prior art in which the first cavity 11 is communicated with the second cavity 31, and the scheme in which the sealing member is arranged between the first cavity 11 and the second cavity 31, when the pressure in the first cavity 11 is relatively large, the sealing member is prone to failure, leading to that the water vapor and other impurities enter the second cavity 31, in order to avoid the impurities entering the second cavity 31, the performance of the sealing member is often considered to be continuously improved, on the one hand, the cost is increased, and on the other hand, even if the performance of the sealing member is good, when the pressure in the first cavity 11 is too large, the sealing member is still subject to the risk of failure. The cathode control valve provided in the embodiment of the application separates the first cavity 11 from the second cavity 31 by arranging the through hole 40 between the control box 30 and the first shell 10, so that the first cavity 11 and the second cavity 31 become two spaces that do not connect with each other, and the through hole 40 is communicated with the atmosphere, so that even if the first cavity 11 leaks (for example, the sealing member fails), the water vapor and other impurities will directly enter the atmosphere, and will not enter the second cavity 31, so that the electronic components such as the motor and the sensor in the control box 30 can be prevented from being corroded by the impurities.

[0045] In some embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 , the control part 32 comprises a rotating shaft 321, the control box 30 comprises a top shell 301 and a bottom shell 302, the top shell 301 and the first shell 10 jointly enclose the through hole 40, the air inlet 111 and the air outlet 112 are arranged to form the air channel 110 along the radial direction X (i.e., the first direction X) of the rotating shaft 321, and the rotating shaft 321 passes through the top shell 301 of the control box 30, the through hole 40 and the first shell 10 in sequence along the axial direction Y (i.e., the second direction Y) of the rotating shaft 321 and is connected with the disc 20. Exemplarily, the rotating shaft 321 is arranged to extend along the second direction Y, the disc 20 is detachably connected with the rotating shaft 321 by means of screws or other connectors, and when the rotating shaft 321 rotates, the disc 20 can be driven to rotate synchronously.

[0046] Exemplarily, the top shell 301 of the control box 30 is integrally arranged with the first shell 10, and the top shell 301 and the bottom shell 302 are detachably connected by means of bolts or other connectors. Understandably, the top shell 301 and the first shell 10 can also be detachably connected, which is not limited in the application.

[0047] In some embodiments, referring to Figure 1 、 Figure 2 、 Figure 3The cathode control valve further comprises a first sealing part 50 and a second sealing part 60. The first shell 10 comprises a first through hole 12, and the control box 30 comprises a second through hole 33 which is arranged on the top shell 301 and is axially aligned with the first through hole 12. The first sealing part 50 is arranged on the first through hole 12, and the second sealing part 60 is arranged on the second through hole 33. The shaft 321 is connected to the disc 20 by sequentially penetrating the second through hole 33, the through hole 40 and the first through hole 12. The first through hole 12 is in communication with the first cavity 11 and the through hole 40, and the second through hole 33 is in communication with the second cavity 31 and the through hole 40. The through hole 40 is directly in communication with the atmosphere, so that the first cavity 11 and the second cavity 31 are independent of each other and cannot be directly communicated.

[0048] In some embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 The first sealing part 50 comprises a first sealing ring 51 which is sleeved on the shaft 321 and abuts against the first hole wall 121 of the first through hole 12. The first sealing ring 51 is connected to the first hole wall 121 in an interference fit.

[0049] In some embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 The second sealing part 60 comprises a second sealing ring 61 and a bearing 62. The bearing 62 is arranged on the side of the second sealing ring 61 which faces the second cavity 31 along the axial direction Y. The second sealing ring 61 and the bearing 62 are both sleeved on the shaft 321 and abut against the second hole wall 331 of the second through hole 33. The bearing 62 comprises a ball bearing. The type of the bearing 62 is not limited in the embodiments of the present application. For example, the bearing 62 can also be a spherical bearing or other types of bearings. The bearing 62 is sleeved on the shaft 321 to facilitate the rotation of the shaft 321 relative to the top shell 301. Since the through hole 40 is in communication with the atmosphere, the second sealing ring 61 only needs to ensure the sealing between the second cavity 31 and the through hole 40. That is, the second sealing ring 61 is only subjected to the impact of atmospheric pressure. Therefore, the performance requirement of the second sealing ring 61 can be appropriately reduced. For example, a common O-shaped sealing ring can also meet the requirement, and the cost can also be reduced accordingly.

[0050] In some embodiments, referring to Figure 4 、 Figure 5 、 Figure 6 and in combination with Figure 3The control unit 32 comprises a motor 322 and a multi-stage gear transmission mechanism 323, the multi-stage gear transmission mechanism 323 comprises a first gear 3231 and a second gear 3232, the motor 322 is connected with the first gear 3231, the first gear 3231 and the second gear 3232 are engaged, the second gear 3232 is connected with the rotating shaft 321, and the rotating shaft 321 is driven to rotate to switch the disc 20 between the first state and the second state. Exemplarily, the motor 322 is arranged in the space of the second cavity 31 of the top shell 301, the first gear 3231 is sleeved on the output shaft of the motor 322, and the first gear 3231 and the second gear 3232 are engaged with each other in the third direction Z (the third direction Z is the radial direction of the rotating shaft 321 perpendicular to the first direction X).

[0051] In some embodiments, referring to Figure 4 、 Figure 5 、 Figure 6 and combining Figure 3 , the multi-stage gear transmission mechanism 323 further comprises a third gear 3233 and a fourth gear 3234, the third gear 3233 is engaged with the first gear 3231, the fourth gear 3234 is engaged with the second gear 3232, the second gear 3232 comprises a connecting portion 32321 arranged on the end face of the second gear 3232, and the rotating shaft 321 is connected with the connecting portion 32321. Exemplarily, along the third direction Z, the third gear 3233 is arranged between the first gear 3231 and the third gear 3233, and the third gear 3233 is arranged on the top shell 301 through a fixed shaft 32331 protruding from the top shell 301 along the axial direction Y away from the first shell 10.

[0052] Exemplarily, referring to Figure 4 、 Figure 5 、 Figure 6 and combining Figure 7 , the fourth gear 3234 is sleeved on the fixed shaft 32331, the pitch circle diameter L1 of the fourth gear 3234 is smaller than the pitch circle diameter L2 of the second gear 3232, the end face of the fourth gear 3234 coincides with the end face of the third gear 3233, the fourth gear 3234 is engaged with the second gear 3232, at this time, the second gear 3232 is not engaged with the third gear 3233, and the power output by the motor 322 is transmitted to the rotating shaft 321 through the first gear 3231, the third gear 3233, the fourth gear 3234 and the second gear 3232 in sequence. Exemplarily, the second gear 3232 comprises a fan gear engaged with the fourth gear 3234.

[0053] Exemplarily, the connecting portion 32321 is arranged to extend along the axial direction Y towards the second through hole 33, the connecting portion 32321 comprises a connecting groove 32322, the rotating shaft 321 is inserted into the connecting groove 32322, the embodiments of the present application do not limit the fixing manner of the rotating shaft 321 and the connecting portion 32321, for example, the rotating shaft 321 and the connecting portion 32321 can be fixed by welding, when the second gear 3232 rotates, the connecting portion 32321 and the rotating shaft 321 rotate, so as to switch the disc 20 between the first state and the second state.

[0054] It can be understood that the embodiments of the present application do not limit the specific structure of the multi-stage gear transmission mechanism 323, that is, the number or size of the gears of the multi-stage gear transmission mechanism 323 is not limited, and the specific structure can be set according to actual needs.

[0055] In some embodiments, referring to Figure 4 、 Figure 5 、 Figure 6 and combining with Figure 3 , the control portion 32 comprises a reset elastic member 324, the reset elastic member 324 is arranged on the end face of the second gear 3232, the reset elastic member 324 can be switched between a compressed state and a reset state, in the first state, the reset elastic member 324 is in the compressed state, in the second state, the reset elastic member 324 is in the reset state. Exemplarily, the reset elastic member 324 comprises a torsion spring.

[0056] In some embodiments, referring to Figure 4 、 Figure 5 、 Figure 6 and combining with Figure 3 , the second gear 3232 comprises a first protruding portion 32323, the first protruding portion 32323 is arranged on the end face of the second gear 3232 around the connecting portion 32321 in the circumferential direction R, and the reset elastic member 324 is arranged around the side face of the first protruding portion 32323. In the third direction Z, the first protruding portion 32323 is arranged to be spaced apart from the connecting portion 32321. Exemplarily, in order to further improve the protection of the rotating shaft 321, the second gear 3232 comprises a second protruding portion 32324, in the third direction Z, the second protruding portion 32324 is arranged between the connecting portion 32321 and the first protruding portion 32323, and the first protruding portion 32323, the second protruding portion 32324 and the connecting portion 32321 are arranged to be spaced apart two by two.

[0057] In some embodiments, the bottom shell 302 of the control box 30 is further provided with a plug-in portion 34, the plug-in portion 34 is used to connect the motor 322 and an external control system, so as to receive the control instruction of the external control system and adjust the flow of the gas.

[0058] Although the utility model has been illustrated and described by referring to certain preferred embodiments of the utility model, it should be understood by those skilled in the art that the above content is the further detailed description of the utility model combined with the specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple inferences or replacements, without departing from the spirit and scope of the utility model.

Claims

1. A cathode control valve, characterized by The application relates to a control box and a first shell. The first shell comprises a first cavity, and the first cavity comprises a gas inlet and a gas outlet arranged at intervals. A disc is arranged in the first cavity and can be switched between a first state and a second state. The control box comprises a second cavity and a control part arranged in the second cavity. The control part is connected with the disc and is used for switching the disc between the first state and the second state.

2. The cathode control valve of claim 1, wherein In the first state, the gas inlet and the gas outlet are in communication.

3. The cathode control valve of claim 2, wherein, In the second state, the gas inlet and the gas outlet are not in communication.

4. The cathode control valve of claim 3, wherein A through hole is arranged between the control box and the first shell.

5. The cathode control valve of claim 3, wherein The control box and the first shell jointly form the through hole.

6. A cathode control valve according to any one of claims 2 to 5, wherein The first cavity is separated from the second cavity, and the first cavity is not in communication with the second cavity.

7. The cathode control valve of claim 6, wherein The control part comprises a rotating shaft.

8. The cathode control valve of claim 6, wherein Along the radial direction of the rotating shaft, the gas inlet and the gas outlet are arranged at intervals. Along the axial direction of the rotating shaft, the rotating shaft sequentially passes through the control box, the through hole, the first shell and is connected with the disc. The first shell comprises a first through hole, and the control box comprises a second through hole. Along the axial direction, the first through hole and the second through hole are oppositely arranged. The first sealing part is arranged in the first through hole. The second sealing part is arranged in the second through hole. The rotating shaft sequentially passes through the second through hole, the through hole, the first through hole and is connected with the disc. The first sealing part comprises a first sealing ring. The first sealing ring is sleeved on the rotating shaft and abuts against a first hole wall of the first through hole. The second sealing part comprises a second sealing ring and a bearing. Along the axial direction, the bearing is arranged on one side of the second sealing ring facing the second cavity. The second sealing ring and the bearing are sleeved on the rotating shaft. The second sealing ring and the bearing abut against a second hole wall of the second through hole. The control part comprises a motor and a multi-stage gear transmission mechanism. The multi-stage gear transmission mechanism comprises a first gear and a second gear. The motor is connected with the first gear. The first gear and the second gear are in engagement. The second gear is connected with the rotating shaft and is used for driving the rotating shaft to rotate so that the disc is switched between the first state and the second state. The multi-stage gear transmission mechanism further comprises a third gear and a fourth gear. An end face of the fourth gear coincides with an end face of the third gear. The pitch circle diameter of the fourth gear is smaller than the pitch circle diameter of the third gear. The third gear is in engagement with the first gear. The fourth gear is in engagement with the second gear. The control part comprises a reset elastic member. The reset elastic member is arranged on an end face of the second gear. The reset elastic member can be switched between a compression state and a reset state. In the first state, the reset elastic member is in the compression state. In the second state, the reset elastic member is in the reset state.

9. The cathode control valve of claim 8, wherein, The second gear includes a first protrusion, which is circumferentially arranged on an end surface of the second gear, and the reset elastic member is circumferentially arranged on a side surface of the first protrusion.

10. A fuel cell system characterized by comprising: Comprising: The cathode control valve according to any one of claims 1 to 9; A fuel cell stack including a cathode and an anode, the cathode being connected to the gas outlet of the cathode control valve; A source of reaction gas, the source of reaction gas being connected to the gas inlet of the cathode control valve; A source of fuel gas, the source of fuel gas being connected to the anode.

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