Hydrogen supply system of fuel cell

Abstract

The utility model discloses a hydrogen supply system of a fuel cell, the fuel cell comprises a hydrogen inlet and a hydrogen outlet, the hydrogen supply system comprises a pressurizing branch and a non-pressurizing branch which are connected in parallel and are both used for communicating the hydrogen outlet and the hydrogen inlet; the hydrogen circulating pump is arranged on the pressurizing branch, the ejector is arranged on the non-pressurizing branch, and the first pressure sensor is arranged on a confluence pipeline between the upstream of the pressurizing branch and the upstream of the non-pressurizing branch and the hydrogen outlet and used for detecting the pressure of the hydrogen outlet; when the pressure of the hydrogen outlet is smaller than a preset pressure value, the hydrogen circulating pump is started, and hydrogen at the hydrogen outlet is led back to the fuel cell; and when the pressure of the hydrogen outlet is not less than a preset pressure value, the ejector is started to guide the hydrogen at the hydrogen outlet back to the fuel cell. By adopting the scheme, the hydrogen backflow efficiency can be improved, the parasitic power and noise of the system can be reduced, and the probability that hydrogen is polluted by lubricating oil of the hydrogen circulating pump is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a hydrogen supply system for a fuel cell. Background Art

[0002] A fuel cell is a device that generates electricity through an electrochemical reaction between hydrogen and oxygen in the air under the action of a catalyst. When a fuel cell is working, it requires the participation of auxiliary subsystems such as an air supply system, a hydrogen supply system, a thermal management system, a stack system, and an electrical system. The hydrogen supply system supplies the hydrogen required for the fuel cell stack reaction and meets the hydrogen flow, pressure, temperature and purity requirements of the fuel cell at different powers. At the same time, part of the hydrogen is circulated to improve the utilization rate of hydrogen and reduce the accumulation of nitrogen and water.

[0003] The existing hydrogen supply system has major problems in controlling the pressure of hydrogen entering the stack and hydrogen circulation. For example, the hydrogen circulation flow rate of the fuel cell system is not easy to control under low working conditions. A relatively mature solution is to use a hydrogen circulation pump to lead the hydrogen that has not been completely reacted at the anode outlet of the stack back to the stack to improve the utilization rate of hydrogen. This solution has parasitic power and noise for the fuel cell system, and has a certain impact on the net power output and stability of the system; and the hydrogen circulation pump needs lubricating oil to run for a long time. If it runs for a long time, there is a risk of oil contamination of hydrogen. Another solution is to use a hydrogen ejector, which is arranged at the rear end of the pressure regulating proportional valve to lead the hydrogen that has not been completely reacted at the anode outlet of the stack back to the stack to improve the utilization rate of hydrogen. In the low power range of the fuel cell, the hydrogen ejector hardly works, and there is no hydrogen circulation effect, which affects the normal operation of the fuel cell system. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects in the prior art that the hydrogen supply system controls the pressure of hydrogen entering the fuel cell stack and the hydrogen circulation effect is poor under different working conditions, and to provide a hydrogen supply system for a fuel cell.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A hydrogen supply system for a fuel cell, the fuel cell comprising a hydrogen inlet and a hydrogen outlet,

[0007] The hydrogen supply system comprises a pressurized branch and a non-pressurized branch, the pressurized branch and the non-pressurized branch are connected in parallel, and are both used to connect the hydrogen outlet and the hydrogen inlet;

[0008] Also includes

[0009] A hydrogen circulation pump is arranged in the pressurized branch,

[0010] an ejector arranged in the non-pressurized branch,

[0011] and a first pressure sensor, disposed on a confluence pipeline between the pressurized branch and the non-pressurized branch upstream and connected to the hydrogen outlet, for detecting the pressure of the hydrogen outlet;

[0012] When the pressure of the hydrogen outlet is less than a predetermined pressure value, the hydrogen circulation pump is started to lead the hydrogen at the hydrogen outlet back to the fuel cell;

[0013] When the pressure of the hydrogen outlet is not less than a predetermined pressure value, the ejector is started to introduce the hydrogen at the hydrogen outlet back to the fuel cell.

[0014] In this scheme, the hydrogen supply system can recycle the unreacted hydrogen in the fuel cell to the fuel cell under different operating conditions. Under low operating conditions, the unreacted hydrogen in the fuel cell is driven by a hydrogen circulation pump, and under high operating conditions, the unreacted hydrogen is introduced back to the fuel cell by an ejector, thereby improving the efficiency of hydrogen reflux, reducing system parasitic power and noise, and reducing the probability of hydrogen being contaminated by the lubricating oil of the hydrogen circulation pump.

[0015] Preferably, the hydrogen supply system further comprises a water separator module, and the water separator module is arranged between the first pressure sensor and the hydrogen outlet.

[0016] In this solution, the nitrogen and water in the mixed gas discharged from the hydrogen outlet can be separated by the water separator module, thereby improving the purity of the refluxed hydrogen. The water separator module is arranged between the first pressure sensor and the hydrogen outlet, which can improve the detection accuracy of the first pressure sensor for the pressure value of the circulating hydrogen, thereby improving the accuracy of the subsequent selection of the pressurized branch and the non-pressurized branch.

[0017] Preferably, the water separator module comprises a water separator body, a nitrogen exhaust solenoid valve and a water discharge solenoid valve.

[0018] The water separator body is connected between the first pressure sensor and the hydrogen outlet, and is used to separate nitrogen and water in the mixed gas discharged from the hydrogen outlet;

[0019] The nitrogen exhaust solenoid valve is arranged at the upper end of the water separator body, and is used to discharge the nitrogen separated from the mixed gas out of the water separator body;

[0020] The drain solenoid valve is connected to the lower end of the water separator body and is used to discharge the water separated from the mixed gas out of the water separator body.

[0021] In this solution, the nitrogen exhaust solenoid valve can discharge the separated nitrogen, thereby improving the purity of hydrogen during system operation. The water discharge solenoid valve can discharge the separated water from the hydrogen supply system to prevent flooding and increase the concentration of circulating hydrogen.

[0022] Preferably, the water distributor module further comprises a water level sensor, and the water level sensor is connected to the water distributor body and is used for detecting the water level in the water distributor body.

[0023] In this solution, the water level in the water distributor body can be detected by the water level sensor, so that the water in the water distributor body can be discharged in time through the drainage solenoid valve.

[0024] Preferably, the pipelines connected to the outlet ends of the nitrogen exhaust solenoid valve and the water discharge solenoid valve are connected to the outside atmosphere after merging.

[0025] In this embodiment, by adopting the above arrangement, the separated nitrogen and water can be discharged into the atmosphere.

[0026] Preferably, the pressurizing branch is further provided with a first one-way valve, and the first one-way valve is connected to the downstream of the hydrogen circulation pump.

[0027] In this solution, by providing the first one-way valve, hydrogen backflow can occur when the non-pressurized branch is working, thereby improving the reliability of hydrogen reflux.

[0028] Preferably, the non-pressurized branch is further provided with a second one-way valve, and the second one-way valve is connected upstream of the ejector.

[0029] In this solution, by providing a second one-way valve, hydrogen backflow can occur when the pressurization branch is working, thereby improving the reliability of hydrogen reflux.

[0030] Preferably, the hydrogen supply system further comprises a supply branch, the end of which is connected to the hydrogen inlet; the ejector is further provided with an interface connected to the supply branch.

[0031] In this solution, the ejector can supply hydrogen from the hydrogen source to the hydrogen inlet, and can also serve as a hydrogen reflux component to supply hydrogen refluxed from the hydrogen outlet to the hydrogen inlet.

[0032] Preferably, the supply branch further comprises a hydrogen filter, a second pressure sensor, an air intake solenoid valve and a pressure regulating proportional valve which are arranged in sequence and are arranged on the upstream side of the ejector.

[0033] In this solution, the hydrogen filter can filter the intake particulate matter, the second pressure sensor can measure the hydrogen pressure entering the hydrogen supply system, the intake solenoid valve can control the on and off of hydrogen entering the hydrogen supply system, and the pressure regulating proportional valve can be responsible for the hydrogen flow rate into the hydrogen supply system, further affecting the hydrogen inlet pressure of the fuel cell.

[0034] Preferably, the supply branch also includes a third pressure sensor and a safety valve, and the third pressure sensor is arranged in the pipeline between the downstream side of the ejector and the hydrogen inlet; one end of the safety valve is connected to the pipeline between the downstream side of the ejector and the third pressure sensor, and the other end is connected to the outside atmosphere.

[0035] In this solution, the second pressure sensor can detect the pressure of hydrogen entering the fuel cell; when the hydrogen inlet pressure is greater than the specified maximum pressure value, the safety valve can open to discharge the high-pressure hydrogen into the atmosphere to avoid damage to the battery components.

[0036] Preferably, the hydrogen supply system also includes a water separator module, which includes a water separator body, a nitrogen exhaust solenoid valve and a water discharge solenoid valve, one end of the safety valve is connected to the downstream of the pressurized branch and the non-pressurized branch and between the third pressure sensor, and the other end of the safety valve is connected to the outside world through a common channel with the nitrogen exhaust solenoid valve and the water discharge solenoid valve.

[0037] In this solution, the safety valve is connected between the downstream of the pressurized branch and the non-pressurized branch and the third pressure sensor, so that the refluxed hydrogen can also be detected, further improving the protection of the battery.

[0038] The positive progressive effect of the utility model is that the hydrogen supply system can return the unreacted hydrogen in the fuel cell to the fuel cell under different operating conditions. Under low operating conditions, the unreacted hydrogen in the fuel cell is driven by a hydrogen circulation pump, and under high operating conditions, the unreacted hydrogen is introduced back to the fuel cell by an ejector, thereby improving the efficiency of hydrogen reflux, reducing the system parasitic power and noise, and reducing the probability of hydrogen being contaminated by the lubricating oil of the hydrogen circulation pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a hydrogen supply system for a fuel cell provided in an embodiment of the utility model 。

[0040] Description of reference numerals:

[0041] 1 hydrogen filter, 2 second pressure sensor, 3 air intake solenoid valve, 4 pressure regulating proportional valve, 5 ejector, 6 third pressure sensor, 7 fuel cell, 8 safety valve, 9 first non-return valve, 10 hydrogen circulation pump, 11 second non-return valve, 12 first pressure sensor, 13 water distributor body, 14 water distributor module, 15 nitrogen discharge solenoid valve, 16 water level sensor, 17 water discharge solenoid valve, 21 hydrogen inlet, 22 hydrogen outlet. DETAILED DESCRIPTION

[0042] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0043] This embodiment provides a hydrogen supply system for a fuel cell 7, such as Figure 1 As shown, the fuel cell 7 includes a hydrogen inlet 21 and a hydrogen outlet 22 , and the hydrogen supply system can supply hydrogen from a hydrogen source to the fuel cell 7 , so that the fuel cell 7 reacts to generate electrical energy.

[0044] like Figure 1 As shown, the hydrogen supply system includes a pressurized branch and a non-pressurized branch, which are connected in parallel and are both used to connect the hydrogen outlet 22 and the hydrogen inlet 21 .

[0045] The hydrogen supply system also includes: a hydrogen circulation pump 10 arranged in the pressurized branch, an ejector 5 arranged in the non-pressurized branch, and a first pressure sensor 12, which is arranged on a confluence pipeline between the pressurized branch and the non-pressurized branch upstream and connected to the hydrogen outlet 22, and is used to detect the pressure of the hydrogen outlet 22.

[0046] It is understandable that a plurality of branches can be configured in the hydrogen supply system, each branch has at least one device, and each device can be connected by a pipeline. Both the pressurized branch and the non-pressurized branch are branches in the hydrogen supply system. When hydrogen refluxes, the pressurized branch can apply more pressure to the circulating hydrogen relative to the non-pressurized branch. Wherein, relative to the ejector 5 in the non-pressurized branch, the hydrogen circulation pump 10 in the pressurized branch can apply more pressure to the circulating hydrogen. In addition, the upstream and downstream mentioned in the present embodiment refer to, with reference to the direction of hydrogen flow, for a certain device or branch, the pipeline before hydrogen flows into the device or branch is upstream, and the pipeline after hydrogen flows out of the device or branch is downstream.

[0047] The pressurized branch and the non-pressurized branch are connected in parallel, and a first pressure sensor 12 is provided between the upstream of the pressurized branch and the downstream of the hydrogen outlet 22. The first pressure sensor 12 is used to detect the pressure of the hydrogen outlet 22. The pressurized branch and the non-pressurized branch are connected in parallel, which means that the two branches are connected in parallel relative to the fuel cell 7, that is, the two ends of the pressurized branch and the two ends of the non-pressurized branch are connected respectively, and then connected to the fuel cell 7. Figure 1 As shown, compared with the non-pressurized branch, the end of the pressurized branch is closer to the fuel cell 7. The first pressure sensor 12 is used to measure the pressure of the circulating hydrogen. The rear end of the first pressure sensor 12 is divided into a pressurized branch and a non-pressurized branch, and the pressure of the circulating hydrogen can be detected before the circulating hydrogen enters the branch.

[0048] When the pressure of the hydrogen outlet 22 is less than a predetermined pressure value (low operating condition), the hydrogen circulation pump 10 is started to guide the hydrogen at the hydrogen outlet 22 back to the fuel cell 7;

[0049] When the pressure of the hydrogen outlet 22 is not less than a predetermined pressure value (high operating condition), the ejector 5 is started to introduce the hydrogen at the hydrogen outlet 22 back to the fuel cell 7 .

[0050] The hydrogen supply system can return the unreacted hydrogen in the fuel cell 7 to the fuel cell 7 under different working conditions, thereby improving the utilization rate of hydrogen; by arranging the pressurized branch and the non-pressurized branch in parallel, the hydrogen circulation pump 10 is operated under low working conditions to recycle the hydrogen, and under certain working conditions, the hydrogen ejector 5 branch is switched to recycle the hydrogen, thereby reducing the parasitic power and noise of the system, and reducing the probability of hydrogen contamination by the lubricating oil of the hydrogen circulation pump 10. Furthermore, the non-pressurized branch leads to the reflux port of the ejector 5, and the low-pressure hydrogen is led back to the battery by using the fluid mechanics characteristics of the ejector 5, thereby reducing the parasitic power and noise of the system.

[0051] like Figure 1 As shown, the hydrogen supply system also includes a water separator module 14, which is connected between the first pressure sensor 12 and the hydrogen outlet 22. The water separator module 14 can separate the nitrogen and water in the mixed gas discharged from the hydrogen outlet 22, thereby improving the purity of the refluxed hydrogen. The water separator module 14 is arranged between the first pressure sensor 12 and the hydrogen outlet 22, which can improve the detection accuracy of the first pressure sensor 12 for the pressure value of the circulating hydrogen, thereby improving the accuracy of the subsequent selection of the pressurized branch and the non-pressurized branch.

[0052] In specific implementation, during the electrochemical reaction of the battery, nitrogen and water that penetrate from the cathode will be present in the anode, so a water separator module 14 is arranged at the hydrogen outlet 22 of the battery to separate nitrogen and water in the unreacted mixed gas, and the separated nitrogen and water are discharged into the atmosphere.

[0053] like Figure 1 As shown, the water separator module 14 includes a water separator body 13, a nitrogen exhaust solenoid valve 15 and a water discharge solenoid valve 17. The water separator body 13 is connected between the first pressure sensor 12 and the hydrogen outlet 22, and is used to separate nitrogen and water in the mixed gas discharged from the hydrogen outlet 22; the nitrogen exhaust solenoid valve 15 is arranged at the upper end of the water separator body 13, and is used to discharge the nitrogen separated from the mixed gas from the water separator body 13; the water discharge solenoid valve 17 is connected to the lower end of the water separator body 13, and is used to discharge the water separated from the mixed gas from the water separator body 13. The nitrogen exhaust solenoid valve 15 can discharge the separated nitrogen, thereby improving the purity of hydrogen during the operation of the system. The water discharge solenoid valve 17 can discharge the separated water from the hydrogen supply system to prevent flooding and increase the concentration of circulating hydrogen.

[0054] like Figure 1 As shown, the water divider module 14 further includes a water level sensor 16, which is connected to the water divider body 13 and is used to detect the water level in the water divider body 13. The water level in the water divider body 13 can be detected by the water level sensor 16, so that the water in the water divider body 13 can be discharged in time through the drainage solenoid valve 17.

[0055] like Figure 1 As shown, the water separator module 14 is modularly designed, integrating the water separator, nitrogen exhaust solenoid valve 15 , water level sensor 16 , drain solenoid valve 17 , etc., which is beneficial to the optimization of the volume ratio, mass specific power and other parameters of the fuel cell 7 .

[0056] like Figure 1 As shown, the pipelines connected to the outlet ends of the nitrogen exhaust solenoid valve 15 and the water discharge solenoid valve 1 are connected to the outside atmosphere after merging, so that the separated nitrogen and water can be discharged into the atmosphere.

[0057] like Figure 1 As shown, the pressurized branch is further provided with a first one-way valve 9, which is connected to the downstream of the hydrogen circulation pump 10, wherein the downstream refers to the direction along which the hydrogen flows, and the first one-way valve 9 is located at the outflow side of the hydrogen circulation pump 10. The non-pressurized branch is further provided with a second one-way valve 11, which is connected to the upstream of the ejector 5, wherein the upstream refers to the direction along which the hydrogen flows, and the second one-way valve 11 is located at the inflow side of the ejector 5.

[0058] When the system is running under low working conditions, the pressure and flow rate of the reflux hydrogen are small, the circulating hydrogen pressure collected by the first pressure sensor 12 is less than the set pressure value P, the pressurized branch starts to run, and the pressurized branch includes a hydrogen circulation pump 10 and a first one-way valve 9, which guides the hydrogen that has not been completely reacted at the anode outlet of the stack back to the stack; when the system is running under high working conditions, the pressure and flow rate of the reflux hydrogen are large, the circulating hydrogen pressure collected by the first pressure sensor 12 is greater than the set pressure value P, the non-pressurized branch starts to run, and the non-pressurized branch includes a second one-way valve 11. When the pressure is greater than the set pressure value P, the second one-way valve 11 can be driven to open, and the hydrogen that has not been completely reacted flows to the reflux port of the ejector 5, and then is guided back to the stack. By setting the first one-way valve 9 and the second one-way valve 11, it is possible to prevent hydrogen backflow when the other branch is working.

[0059] like Figure 1 As shown, the hydrogen supply system further includes a supply branch, the end of which is connected to the hydrogen inlet 21; the ejector 5 is also provided with an interface connected to the supply branch. The ejector 5 can supply hydrogen from the hydrogen source to the hydrogen inlet 21, and can also serve as a hydrogen reflux component to supply hydrogen refluxed from the hydrogen outlet 22 to the hydrogen inlet 21.

[0060] like Figure 1 As shown, the supply branch also includes a hydrogen filter 1, a second pressure sensor 2, an intake solenoid valve 3 and a pressure regulating proportional valve 4 which are arranged in sequence and are arranged on the upstream side of the ejector 5. The outlet of the hydrogen filter 1 is connected to the inlet of the intake solenoid valve 3 through a pipeline, and a second pressure sensor 2 is installed between them. The hydrogen filter 1 is used to filter the intake particulate matter, the second pressure sensor 2 is used to measure the hydrogen pressure entering the hydrogen supply system, and the intake solenoid valve 3 is used to control the on-off of hydrogen entering the hydrogen supply system. The outlet of the intake solenoid valve 3 is connected to the inlet of the pressure regulating proportional valve 4, and the pressure regulating proportional valve 4 is used to control the hydrogen flow rate of the hydrogen supply system, which further affects the anode pressure of the stack; the ejector 5 is arranged at the rear end of the pressure regulating proportional valve 4 to lead the unreacted hydrogen at the outlet of the anode of the stack back to the stack to improve the utilization rate of hydrogen.

[0061] like Figure 1 As shown, the supply branch also includes a third pressure sensor 6 and a safety valve 8. The third pressure sensor 6 is arranged in the pipeline between the downstream side of the ejector 5 and the hydrogen inlet 21; one end of the safety valve 8 is connected to the pipeline between the downstream side of the ejector 5 and the third pressure sensor 6, and the other end is connected to the outside atmosphere. The outlet of the ejector 5 is connected to the hydrogen inlet 21 of the battery to form a hydrogen inlet branch. The safety valve 8 and the third pressure sensor 6 are installed on the hydrogen inlet branch. The safety valve 8 is used to max When the pressure drops below 0.1, the safety valve 8 opens to discharge the high-pressure hydrogen into the atmosphere to prevent damage to the components of the fuel cell stack. The third pressure sensor 6 is used to measure the pressure of the hydrogen entering the fuel cell stack.

[0062] like Figure 1 As shown, one end of the safety valve 8 is connected to the downstream of the pressurized branch and the non-pressurized branch and between the third pressure sensor 6, and the other end of the safety valve 8 is connected to the outside world through a common channel with the nitrogen exhaust solenoid valve 15 and the water discharge solenoid valve 17. The refluxed hydrogen can also be detected to further enhance the protection of the battery. Figure 1 As shown, the safety valve 8 is connected between the downstream of the first check valve 9 and the third pressure sensor 6 .

[0063] The hydrogen supply system provided in this embodiment has a simple principle and fewer parts, which is more favorable for the system structure layout and can improve parameters such as system volume ratio and mass-to-power ratio.

[0064] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A hydrogen supply system for a fuel cell, the fuel cell comprising a hydrogen inlet and a hydrogen outlet, characterized in that: The hydrogen supply system comprises a pressurized branch and a non-pressurized branch, the pressurized branch and the non-pressurized branch are connected in parallel, and are both used to connect the hydrogen outlet and the hydrogen inlet; Also includes A hydrogen circulation pump is arranged in the pressurized branch, an ejector arranged in the non-pressurized branch, and a first pressure sensor, disposed on a confluence pipeline between the pressurized branch and the non-pressurized branch upstream and connected to the hydrogen outlet, for detecting the pressure of the hydrogen outlet; When the pressure of the hydrogen outlet is less than a predetermined pressure value, the hydrogen circulation pump is started to lead the hydrogen at the hydrogen outlet back to the fuel cell; When the pressure of the hydrogen outlet is not less than a predetermined pressure value, the ejector is started to introduce the hydrogen at the hydrogen outlet back to the fuel cell.

2. The hydrogen supply system for a fuel cell according to claim 1, characterized in that: The hydrogen supply system further includes a water separator module, and the water separator module is disposed between the first pressure sensor and the hydrogen outlet.

3. The hydrogen supply system for a fuel cell according to claim 2, characterized in that: The water separator module includes a water separator body, a nitrogen exhaust solenoid valve and a water discharge solenoid valve; The water separator body is connected between the first pressure sensor and the hydrogen outlet, and is used to separate nitrogen and water in the mixed gas discharged from the hydrogen outlet; The nitrogen exhaust solenoid valve is arranged at the upper end of the water separator body, and is used to discharge the nitrogen separated from the mixed gas out of the water separator body; The drain solenoid valve is connected to the lower end of the water separator body and is used to discharge the water separated from the mixed gas out of the water separator body.

4. The hydrogen supply system for a fuel cell according to claim 3, characterized in that: The water distributor module further comprises a water level sensor, which is connected to the water distributor body and is used to detect the water level in the water distributor body.

5. The hydrogen supply system for a fuel cell according to claim 3, characterized in that: Connect to The pipelines at the outlet ends of the nitrogen exhaust solenoid valve and the water discharge solenoid valve are connected to the outside atmosphere after merging.

6. The hydrogen supply system for a fuel cell according to claim 1, wherein: The pressurizing branch is also provided with a first one-way valve, and the first one-way valve is connected to the downstream of the hydrogen circulation pump.

7. The hydrogen supply system for a fuel cell according to claim 1, characterized in that: The non-pressurized branch is also provided with a second one-way valve, and the second one-way valve is connected upstream of the ejector.

8. The hydrogen supply system for a fuel cell according to claim 1, wherein: The hydrogen supply system also includes a supply branch, the end of which is connected to the hydrogen inlet; the ejector is also provided with an interface connected to the supply branch.

9. The hydrogen supply system for a fuel cell according to claim 8, characterized in that: The supply branch also includes a hydrogen filter, a second pressure sensor, an intake solenoid valve and a pressure regulating proportional valve which are arranged in sequence and are arranged on the upstream side of the ejector.

10. The hydrogen supply system for a fuel cell according to claim 8, characterized in that: The supply branch also includes a third pressure sensor and a safety valve. The third pressure sensor is arranged in the pipeline between the downstream side of the ejector and the hydrogen inlet; one end of the safety valve is connected to the pipeline between the downstream side of the ejector and the third pressure sensor, and the other end is connected to the outside atmosphere.

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