Fuel cell hydrogen system, control method, and fuel cell

Abstract

The application provides a fuel cell hydrogen system, a control method and a fuel cell. The fuel cell hydrogen system comprises a gas source, a pressure reducing valve, a safety valve, a first pressure sensor, a first proportional valve, a second proportional valve, a second pressure sensor, an ejector, a third pressure sensor, a temperature sensor, a fourth pressure sensor, a stack, a water segregator, a first electric control valve, a second electric control valve, a hydrogen circulation pump, a one-way valve, a third electric control valve, a fourth electric control valve and a fifth pressure sensor. The problems of high power consumption, reduced net efficiency, short service life, high failure rate and reduced inlet pressure of the ejector in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fuel cells, and particularly relates to a fuel cell hydrogen system, a control method and a fuel cell. BACKGROUND

[0002] The fuel cell engine system is a new type of fuel cell power generation system, which converts chemical energy generated by chemical reactions in the device into electrical energy through the electrochemical device. The hydrogen fuel cell engine system, as an important carrier for hydrogen fuel application, has the characteristics of no pollution and environmental friendliness. The fuel cell system is relatively complex and mainly consists of hydrogen, air, water, electricity, stack and other subsystems. The stability and advancement of the hydrogen subsystem, as the supply part of the fuel cell electrochemical reaction, directly determine the characteristics of the fuel cell engine system.

[0003] At present, the hydrogen subsystem architecture of the fuel cell engine system mainly has two types: one is the hydrogen circulating pump scheme. The hydrogen circulating pump is used to pressurize the unreacted gas of the fuel cell to enter the stack again, thereby improving the use efficiency of hydrogen. The other is the hydrogen ejector scheme. The ejector scheme works on the Venturi principle, which improves the reliability of the fuel cell engine system in application.

[0004] The inventors found the following problems in the prior art during the implementation of the technical solution.

[0005] 1. The design of the single hydrogen circulating pump needs to compress the hydrogen pressure at the outlet of the circulating path to the target pressure at the inlet of the stack, which has a high pressure increase and high power consumption.

[0006] 2. The single hydrogen circulating pump has high dependence and no fault tolerance, and the hydrogen circulating pump has a high failure rate, resulting in a high failure rate of the fuel cell system.

[0007] 3. During the low-temperature cold start process, the hydrogen circulating pump is prone to icing and cannot start, and the ice-breaking operation of the circulating pump reduces the service life.

[0008] 4. When the fuel cell engine is running at high power, the power consumption of the hydrogen circulating pump increases with the increase of the operating power of the stack, which reduces the net output power of the stack and reduces the net efficiency.

[0009] 5. The scheme of parallel connection of the ejector and the circulating pump has the problem of reduced inlet pressure caused by the operation of the circulating pump, thereby reducing the inlet flow of the ejector, and in severe cases, causing reverse flow of the ejector. SUMMARY

[0010] In view of the problems in the prior art, the fuel cell hydrogen system, the control method and the fuel cell provided by the application at least partially solve the problems of high power consumption, reduced net efficiency, short service life, high failure rate and reduced inlet pressure of the ejector in the prior art.

[0011] In a first aspect, the embodiments of the present disclosure provide a fuel cell hydrogen system, comprising: a gas source, a pressure reducing valve, a safety valve, a first pressure sensor, a first proportional valve, a second proportional valve, a second pressure sensor, an ejector, a third pressure sensor, a temperature sensor, a fourth pressure sensor, an electric pile, a water separator, a first electric control valve, a second electric control valve, a hydrogen circulating pump, a check valve, a third electric control valve, a fourth electric control valve and a fifth pressure sensor;

[0012] The outlet of the gas source is sequentially connected with the inlet of the electric pile through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor and the fourth pressure sensor, the inlet of the second proportional valve is communicated with the inlet of the first proportional valve, and the outlet of the second proportional valve is communicated with the outlet of the ejector.

[0013] The outlet of the electric pile is sequentially connected with the backflow port of the ejector through the water separator, the second electric control valve, the hydrogen circulating pump, the fourth electric control valve and the fifth pressure sensor, the first electric control valve is communicated with the water separator, the check valve is arranged between the inlet of the second electric control valve and the inlet of the fourth electric control valve, and the third electric control valve is arranged between the outlet of the hydrogen circulating pump and the outlet of the ejector.

[0014] Optionally, the system working mode includes a circulating pump mode, an ejector mode or a circulating pump+ejector mode.

[0015] Optionally, when the system is in the circulating pump mode, the gas in the gas source enters the electric pile sequentially through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor and the fourth pressure sensor, and the gas reacted by the electric pile enters the electric pile sequentially through the water separator, the second electric control valve, the hydrogen circulating pump, the third electric control valve and the fourth pressure sensor.

[0016] Optionally, when the system is in the ejector mode, the gas in the gas source enters the electric pile sequentially through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor and the fourth pressure sensor, and the gas reacted by the electric pile enters the backflow port of the ejector sequentially through the water separator, the check valve and the fourth electric control valve.

[0017] Optionally, when the system is in the circulation pump + ejector mode, the gas in the gas source is divided into two paths, one of which passes through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor and the fourth pressure sensor in sequence to enter the stack, and the other of which passes through the second proportional valve and the fourth pressure sensor in sequence to enter the stack.

[0018] The gas after the stack reaction enters the backflow port of the ejector in sequence through the water segregator, the second electric control valve, the hydrogen circulation pump, the third electric control valve and the fourth electric control valve.

[0019] In a second aspect, the embodiments of the present disclosure further provide a fuel cell hydrogen system control method, applied to the system of any one of the first aspect, and the method comprises:

[0020] Judging the size of the loading working condition current, and controlling the system to work in the circulation pump mode, the ejector mode or the circulation pump + ejector mode based on the size of the loading working condition current.

[0021] Optionally, the controlling the system to work in the circulation pump mode, the ejector mode or the circulation pump + ejector mode based on the size of the loading working condition current comprises:

[0022] When the loading working condition current is the idling current, the first proportional valve is opened, the target pressure P3 entering the stack is adjusted, when the actual pressure of the system reaches the target pressure P3 entering the stack, the circulation pump mode is started, the target rotating speed of the hydrogen circulation pump is set, and the fuel cell is loaded with current when the hydrogen circulation pump reaches the first set rotating speed.

[0023] Optionally, the controlling the system to work in the circulation pump mode, the ejector mode or the circulation pump + ejector mode based on the size of the loading working condition current comprises:

[0024] When the loading working condition current is the small working condition current, the first proportional valve is opened, the target pressure P3 entering the stack is adjusted, the hydrogen circulation pump is closed when the target pressure P3 entering the stack is equal to the actual pressure, the ejector is started, and the backflow port pressure of the ejector is set.

[0025] The fuel cell is loaded with current when the pressure of the fifth pressure sensor reaches the set range.

[0026] Optionally, the controlling the system to work in the circulation pump mode, the ejector mode or the circulation pump + ejector mode based on the size of the loading working condition current comprises:

[0027] When the loading working condition current is the large working condition current, the first proportional valve and the second proportional valve are opened, the target pressure P2 and the target pressure P4 are adjusted, the circulation pump + ejector mode is started when the actual pressure of the system reaches the target pressure P2 and the target pressure P4, and the target rotating speed of the hydrogen circulation pump and the inlet target pressure of the ejector are set.

[0028] When the pressure values detected by the second pressure sensor and the fifth pressure sensor reach the set values, and when the hydrogen circulation pump rotation speed reaches the second set rotation speed, the fuel cell performs current loading.

[0029] In a third aspect, the embodiments of the present disclosure further provide a fuel cell using the system of any one of the first aspect.

[0030] The fuel cell hydrogen system, the control method and the fuel cell provided by the present application have the following effects:

[0031] 1. In the pump mode, the pump can be switched to the ejector mode for starting, thereby enhancing the reliability of cold starting of the fuel cell stack.

[0032] 2. By arranging the hydrogen circulation pump and the ejector, the problem of narrow control range of backflow of the ejector and the problem of inaccurate adjustment of circulation flow in the single ejector are effectively solved; the problem of backflow of the ejector caused by excessive flow resistance of the circulation path during idling point operation is effectively solved.

[0033] 3. By arranging the hydrogen circulation pump and the ejector, the hydrogen circulation pump does not increase in power consumption with the increase of the operating power of the fuel cell stack when the fuel cell engine is operated at high power, thereby improving the net efficiency of the fuel cell stack.

[0034] 4. By using the system of the present application, the lift pressure of the hydrogen circulation pump is reduced, the design difficulty of the circulation pump is reduced, and the power consumption is reduced.

[0035] 5. The structure that the hydrogen circulation pump is connected with the ejector through the parallel one-way valve solves the problems of the decrease of circulation flow of the fuel cell stack caused by the suction of the outlet gas of the circulation pump and the decrease of the inlet pressure of the ejector caused by the operation of the circulation pump. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the different views of the drawings.

[0037] Figure 1 A structural schematic diagram of the fuel cell hydrogen system provided by the embodiments of the present disclosure is shown in the figure;

[0038] Figure 2 A structural schematic diagram of the fuel cell hydrogen system provided by the embodiments of the present disclosure is shown in the figure;

[0039] Figure 3 A structural schematic diagram of the fuel cell hydrogen system provided by the embodiments of the present disclosure is shown in the figure;

[0040] Figure 4 A structural schematic diagram of a fuel cell hydrogen system working in a circulating pump + ejector is provided for the embodiments of the present disclosure;

[0041] Figure 5 A flow chart of a fuel cell hydrogen system control method is provided for the embodiments of the present disclosure;

[0042] Wherein, 1. gas source, 2. pressure reducing valve, 3. safety valve, 4. first pressure sensor, 5. second proportional valve, 6. proportional valve, 7. second pressure sensor, 8. ejector, 9. third pressure sensor, 10. temperature sensor, 11. fourth pressure sensor, 12. stack, 13. water separator, 14. first electric control valve, 15. second electric control valve, 16. hydrogen circulating pump, 17. one-way valve, 18. third electric control valve, 19. fourth electric control valve, 20. fifth pressure sensor. DETAILED DESCRIPTION

[0043] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0044] It should be apparent that the following describes embodiments of this disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, not all. The present disclosure can also be implemented or applied by other different specific embodiments, and various modifications or changes can be made to the details in this specification without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0045] It should be noted that the various aspects of the embodiments described below are within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms and that any specific structure and / or function described herein is merely illustrative. Based on the disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, an apparatus and / or method can be implemented using any number of the aspects set forth herein. In addition, this apparatus and / or method can be implemented using other structures and / or functionalities in addition to or other than those set forth herein.

[0046] It is also necessary to note that the drawings in the following embodiments only illustrate the basic concept of the present disclosure in a schematic manner, and only show the components related to the present disclosure, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be a random change, and the component layout may be more complex.

[0047] In addition, in the following description, specific details are provided to facilitate a thorough understanding of examples. However, one skilled in the art will understand that the aspects described can be practiced without these specific details.

[0048] Hydrogen system: an external supply system for the electrochemical reaction of the fuel cell, responsible for the hydrogen supply to the anode of the fuel cell and the hydrogen circulation system.

[0049] As shown in Figure 1 The present embodiment discloses a fuel cell hydrogen system, comprising: a gas source, a pressure reducing valve, a safety valve, a first pressure sensor, a first proportional valve, a second proportional valve, a second pressure sensor, an ejector, a third pressure sensor, a temperature sensor, a fourth pressure sensor, a stack, a water separator, a first electric control valve, a second electric control valve, a hydrogen circulation pump, a one-way valve, a third electric control valve, a fourth electric control valve and a fifth pressure sensor;

[0050] The outlet of the gas source is sequentially connected with the inlet of the stack through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor and the fourth pressure sensor, the inlet of the second proportional valve is communicated with the inlet of the first proportional valve, and the outlet of the second proportional valve is communicated with the outlet of the ejector;

[0051] The outlet of the stack is sequentially connected with the backflow port of the ejector through the water separator, the second electric control valve, the hydrogen circulation pump, the fourth electric control valve and the fifth pressure sensor, the first electric control valve is communicated with the water separator, the one-way valve is arranged between the inlet of the second electric control valve and the inlet of the fourth electric control valve, and the third electric control valve is arranged between the outlet of the hydrogen circulation pump and the outlet of the ejector.

[0052] Optionally, the system working mode includes a circulation pump mode, an ejector mode or a circulation pump + ejector mode. In each mode, the mode can be adjusted according to the actual state of the stack during the operation of the stack, so as to solve the problems of high cold start failure rate, high circulation pump power consumption and small flow adjustment range of the ejector during the operation of the stack, and enhance the reliability of the operation of the stack.

[0053] Optionally, as shown in Figure 2As shown in the figure, when the system is in the circulation pump mode, the gas in the gas source passes through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor and the fourth pressure sensor in sequence to enter the stack, and the reacted gas passes through the water segregator, the second electric control valve, the hydrogen circulation pump, the third electric control valve and the fourth electric control valve in sequence to enter the backflow port of the ejector.

[0054] Optionally, as shown in the figure, Figure 3 As shown in the figure, when the system is in the circulation pump mode, the gas in the gas source passes through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor and the fourth pressure sensor in sequence to enter the stack, and the reacted gas passes through the water segregator, the second electric control valve, the hydrogen circulation pump, the third electric control valve and the fourth electric control valve in sequence to enter the backflow port of the ejector.

[0055] Optionally, as shown in the figure, Figure 4 As shown in the figure, when the system is in the circulation pump mode, the gas in the gas source passes through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor and the fourth pressure sensor in sequence to enter the stack, and the reacted gas passes through the water segregator, the second electric control valve, the hydrogen circulation pump, the third electric control valve and the fourth electric control valve in sequence to enter the backflow port of the ejector.

[0056] The reacted gas passes through the water segregator, the second electric control valve, the hydrogen circulation pump, the third electric control valve and the fourth electric control valve in sequence to enter the backflow port of the ejector.

[0057] As shown in the figure, the embodiment also discloses a fuel cell hydrogen system control method, which comprises the following steps: Figure 5

[0058] Optionally, the system is controlled to work in the circulation pump mode, the ejector mode or the circulation pump+ejector mode based on the size of the loading condition current.

[0059] Optionally, the system is controlled to work in the circulation pump mode, the ejector mode or the circulation pump+ejector mode based on the size of the loading condition current, and the method comprises the following steps:

[0060] When the loading condition current is the idling current, the first proportional valve is opened, the target pressure P3 entering the stack is adjusted, when the actual pressure of the system reaches the target pressure P3 entering the stack, the circulation pump mode is started, the target rotating speed of the hydrogen circulation pump is set, and the fuel cell is loaded with current when the hydrogen circulation pump reaches the first set rotating speed.

[0061] Optionally, the system is controlled to work in the circulation pump mode, the ejector mode or the circulation pump+ejector mode based on the size of the loading condition current, and the method comprises the following steps:

[0062] ​When the loading condition current is a small condition current, the first proportional valve is opened, the target pressure P3 into the stack is adjusted, when the target pressure into the stack is equal to the actual pressure, the hydrogen circulation pump is closed, the ejector is opened, and the backflow port pressure of the ejector is set;

[0063] When the pressure of the fifth pressure sensor reaches the set range, the fuel cell performs current loading.

[0064] Optionally, the system based on the size of the loading condition current works in a circulation pump mode, an ejector mode or a circulation pump + ejector mode, and comprises:

[0065] When the loading condition current is a large condition current, the first proportional valve and the second proportional valve are opened, the target pressure P2 and the target pressure P4 are adjusted, when the actual pressure of the system reaches the target pressure P2 and the target pressure P4, the circulation pump + ejector mode is opened, and the target rotating speed of the hydrogen circulation pump and the inlet target pressure of the ejector are set.

[0066] When the pressure values detected by the second pressure sensor and the fifth pressure sensor reach the set values, and when the rotating speed of the hydrogen circulation pump reaches the second set rotating speed, the fuel cell performs current loading.

[0067] That is, after the fuel cell engine is started, according to the size of the pull loading current / power of the stack, the working mode is selected. In normal working condition, the circulation pump mode can be selected in the idling condition, which can solve the problem that the backflow of the ejector is small or the risk of reverse flow in the idling point. The ejector mode is selected in the small current condition, the fourth electric control valve is opened, the second electric control valve and the rotating speed of the hydrogen circulation pump are closed, and the third electric control valve is closed, so that the air flow control switching is realized through the one-way valve. The ejector + circulation pump mode is selected in the large current condition, the first proportional valve and the second proportional valve control the pressure P4 into the stack, wherein the first proportional valve controls the inlet pressure of the ejector, and the circulating flow is adjusted together with the rotating speed of the circulation pump (the fifth pressure sensor). In a special state, when the cold start in the circulation pump mode fails, the ejector mode can be switched to perform the pull loading operation of the stack.

[0068] The system of the embodiment comprises the circulation pump mode, the ejector mode or the ejector + circulation pump mode, each mode can stably control the switching, a reasonable mode is selected according to the actual state of the stack system, and the stability of the stack operation is enhanced.

[0069] The embodiment further discloses a fuel cell using the system disclosed in the embodiment.

[0070] The embodiment further discloses a fuel cell using the control method disclosed in the embodiment.

[0071] The above describes the basic principles of the present disclosure in combination with specific embodiments, but it needs to be pointed out that the advantages, benefits, effects and the like mentioned in the present disclosure are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as necessary for each embodiment of the present disclosure. In addition, the specific details of the above disclosure are only for the purpose of example and for the purpose of understanding, and are not limiting, and the above details do not limit the present disclosure to be necessarily implemented with the above specific details.

[0072] In the present disclosure, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. The block diagrams of the devices, apparatuses, equipment, systems involved in the present disclosure are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration as shown in the block diagram. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, which mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0073] In addition, as used herein, "or" used in the list of items "at least one of the items" indicates a separate list, so that, for example, "at least one of A, B or C" means A or B or C, or AB or AC or BC, or ABC (i.e. A and B and C). In addition, the word "exemplary" does not mean that the described example is preferred or better than other examples.

[0074] It also needs to be pointed out that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of the present disclosure.

[0075] Various changes, substitutions and alterations can be made to the technology described herein without departing from the teachings of the appended claims. In addition, the scope of the claims of the present disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of matter, means, methods and acts of the above described. Processes, machines, manufactures, compositions of matter, means, methods or acts currently existing or later developed that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Accordingly, the appended claims include within their scope such processes, machines, manufactures, compositions of matter, means, methods or acts.

[0076] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0077] The above description has been presented to enable any person skilled in the art to make or use the disclosure. Furthermore, the purpose of the above description is not intended to limit the embodiments of the present disclosure to the form disclosed herein. Although various example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, additions, and sub-combinations of the described aspects and embodiments.

Claims

1. A fuel cell hydrogen system, characterized by, The system comprises: a gas source, a pressure reducing valve, a safety valve, a first pressure sensor, a first proportional valve, a second proportional valve, a second pressure sensor, an ejector, a third pressure sensor, a temperature sensor, a fourth pressure sensor, an electric pile, a water separator, a first electric control valve, a second electric control valve, a hydrogen circulating pump, a one-way valve, a third electric control valve, a fourth electric control valve, and a fifth pressure sensor; the outlet of the gas source is sequentially connected with the inlet of the electric pile through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor, and the fourth pressure sensor, the inlet of the second proportional valve is communicated with the inlet of the first proportional valve, and the outlet of the second proportional valve is communicated with the outlet of the ejector; the outlet of the electric pile is sequentially connected with the backflow port of the ejector through the water separator, the second electric control valve, the hydrogen circulating pump, the fourth electric control valve, and the fifth pressure sensor, the first electric control valve is communicated with the water separator, the one-way valve is arranged between the inlet of the second electric control valve and the inlet of the fourth electric control valve, and the third electric control valve is arranged between the outlet of the hydrogen circulating pump and the outlet of the ejector; the system working mode comprises a circulating pump mode, an ejector mode, or a circulating pump + ejector mode; when the system is in the circulating pump mode, the gas in the gas source enters the electric pile sequentially through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor, and the fourth pressure sensor, and the gas reacted by the electric pile enters the electric pile sequentially through the water separator, the second electric control valve, the hydrogen circulating pump, the third electric control valve, and the fourth pressure sensor; when the system is in the ejector mode, the gas in the gas source enters the electric pile sequentially through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor, and the fourth pressure sensor, and the gas reacted by the electric pile enters the backflow port of the ejector sequentially through the water separator, the one-way valve, and the fourth electric control valve.

2. The fuel cell hydrogen system of claim 1, wherein, When the system is in the circulating pump + ejector mode, the gas in the gas source is divided into two paths, one of which enters the electric pile sequentially through the pressure reducing valve, the safety valve, the first pressure sensor, the first proportional valve, the second pressure sensor, the ejector, the third pressure sensor, the temperature sensor, and the fourth pressure sensor, and the other of which enters the electric pile sequentially through the second proportional valve and the fourth pressure sensor; the gas reacted by the electric pile enters the backflow port of the ejector sequentially through the water separator, the second electric control valve, the hydrogen circulating pump, the third electric control valve, and the fourth electric control valve.

3. A method of controlling a fuel cell hydrogen system as claimed in any one of claims 1 to 2, characterized by, The method comprises: judging the size of the loading working condition current, and controlling the system to work in the circulating pump mode, the ejector mode, or the circulating pump + ejector mode based on the size of the loading working condition current; the controlling the system to work in the circulating pump mode, the ejector mode, or the circulating pump + ejector mode based on the size of the loading working condition current comprises: When the loading current is the idle current, the first proportional valve is opened to adjust the target pressure P3, when the actual pressure reaches the target pressure P3, the circulation pump mode is started, the target speed of the hydrogen circulation pump is set, and when the hydrogen circulation pump reaches the first set speed, the fuel cell is loaded with current; the system based on the size of the loading current works in the circulation pump mode, the ejector mode or the circulation pump + ejector mode, comprising: When the loading current is the small current, the first proportional valve is opened to adjust the target pressure P3, when the target pressure is equal to the actual pressure, the hydrogen circulation pump is closed, the ejector is opened, and the backflow pressure of the ejector is set; When the pressure of the fifth pressure sensor reaches the set range, the fuel cell is loaded with current.

4. The fuel cell hydrogen system control method of claim 3, wherein, The system based on the size of the loading current works in the circulation pump mode, the ejector mode or the circulation pump + ejector mode, comprising: When the loading current is the large current, the first proportional valve and the second proportional valve are opened to adjust the target pressure P2 and the target pressure P4, when the actual pressure of the system reaches the target pressure P2 and the target pressure P4, the circulation pump + ejector mode is started, the target speed of the hydrogen circulation pump and the target pressure of the inlet of the ejector are set; When the pressure values detected by the second pressure sensor and the fifth pressure sensor reach the set values, and when the speed of the hydrogen circulation pump reaches the second set speed, the fuel cell is loaded with current.

5. A fuel cell characterized by comprising: The system of any one of claims 1-2.

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