Hydrogen supply system of fuel cell and vehicle

Abstract

The utility model discloses a hydrogen supply system of a fuel cell and a vehicle, and the hydrogen supply system of the fuel cell comprises an electric pile, a hydrogen supply system and a hydrogen supply system, an inlet of the gas-liquid separator is communicated with the anode outlet; the water tank is arranged below the gas-liquid separator and is communicated with a water outlet of the gas-liquid separator, a water drainage valve is arranged below the water tank, and a nitrogen removal valve inclined relative to the horizontal direction is arranged above the side wall of the water tank. Compared with the mode that a drainage valve and a nitrogen removal valve are directly arranged on the gas-liquid separator, under the condition that the drainage valve is frozen and cannot be opened, a certain amount of water can be temporarily stored in the water tank, meanwhile, the drainage valve is heated in time, and the water in the water tank can be drained in time after the drainage valve is rapidly opened. And when the water in the water tank gradually rises to the upper limit, the drain valve is controlled to be opened. In addition, the nitrogen removal valve is obliquely arranged, so that liquid water cannot be accumulated in an exhaust flow channel after the nitrogen removal valve is shut down.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially is related to a hydrogen supply system of fuel cell and vehicle. BACKGROUND

[0002] In recent years, new energy industry continues fast development, hydrogen fuel cell and its system gradually are recognized by the public with its zero emission, fuel filling time is short, and the advantages such as wide application. Fuel cell is through the electrochemical reaction between combustible (hydrogen) and oxygen in air to produce electric energy, wherein, hydrogen fuel cell reactant is pure hydrogen and oxygen in air and reacts to generate electricity and water through proton exchange membrane, but due to the reaction process, to ensure the reaction efficiency, hydrogen has a certain excess coefficient, leading to actual hydrogen reaction is not sufficient, part of hydrogen gas will take the product water together and discharge, so part of hydrogen gas is not utilized, will cause great waste.

[0003] However, this part of hydrogen gas can be normally utilized, but because water content is high, if direct utilization, easy to cause waterlogging of electric pile. The prior art mostly selects a gas-liquid separator to process this part of hydrogen gas, reduces the water content of this part of hydrogen gas, and through the water drain valve, water is discharged and through the nitrogen discharge valve, nitrogen gas and other gases except hydrogen gas are discharged. However, the design of arranging the water drain valve and the nitrogen discharge valve in the prior art is unreasonable, which is easy to cause liquid water to be accumulated in the nitrogen discharge valve. UTILITY MODEL CONTENT

[0004] The utility model aims at least to solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a hydrogen supply system of fuel cell, which can improve system power, avoid power consumption, and ensure the normal use of the nitrogen discharge valve, while avoiding problems such as icing.

[0005] The utility model further provides a vehicle.

[0006] According to the hydrogen supply system of fuel cell of the first aspect embodiment of the utility model, the electric pile has an anode outlet, the gas-liquid separator has an inlet communicated with the anode outlet, the water tank is arranged below the gas-liquid separator and communicated with the water drain port of the gas-liquid separator, the lower portion of the water tank is provided with a water drain valve, and the upper portion of the side wall of the water tank is provided with a nitrogen discharge valve inclined relative to the horizontal direction.

[0007] According to an embodiment of the present invention, the hydrogen supply system for a fuel cell, by installing a water tank below the gas-liquid separator and arranging a drain valve below the water tank and a nitrogen venting valve above the side wall of the water tank, allows for temporary storage of a certain amount of water in the tank when the drain valve is frozen and cannot be opened. Simultaneously, the drain valve is heated in time to quickly open and drain the water from the tank. Furthermore, the present invention can also control the drain valve to open only when the water level in the tank gradually rises to its upper limit, thereby increasing system power and avoiding power consumption. Moreover, the inclined arrangement of the nitrogen venting valve prevents liquid water from accumulating in the exhaust channel after shutdown, ensuring normal operation of the nitrogen venting valve and avoiding problems such as freezing.

[0008] According to some embodiments of the present invention, one end of the nitrogen discharge valve is connected to the outside of the side wall of the water tank and the other end is away from the outside of the side wall of the water tank, and is inclined upward relative to the horizontal direction from the one end to the other end of the nitrogen discharge valve.

[0009] According to some embodiments of this utility model, the distance H between the horizontal line where the center of the end of the nitrogen discharge valve is connected to the side wall of the water tank and the lowest point of the bottom wall of the water tank in the vertical direction is defined as follows: the horizontal line position is defined as when the liquid level inside the water tank rises to the horizontal line, the performance of the fuel cell stack begins to be affected.

[0010] According to some embodiments of the present invention, the hydrogen supply system of the fuel cell further includes a control module, which is electrically connected to the drain valve and the nitrogen discharge valve respectively, and is used to control whether the nitrogen discharge valve vents and / or drains gas according to the working conditions of the fuel cell and to control the working state of the drain valve.

[0011] According to some embodiments of the present invention, the hydrogen supply system of the fuel cell further includes: a stack voltage monitoring module, wherein each sub-stack in the stack is electrically connected to the stack voltage monitoring module, and the stack voltage monitoring module is electrically connected to the control module; the control module is configured to, when the fuel cell is in a cold start condition and the drain valve cannot be opened, acquire the voltage signal of the stack voltage monitoring module to determine whether the stack performance is affected, and control whether the nitrogen venting valve is opened to perform venting and drainage functions.

[0012] According to some embodiments of the present application, the hydrogen circulation cavity is formed by the communication between the inside of the stack, the inside of the gas-liquid separator and the inside of the water tank.

[0013] According to some embodiments of the present application, the hydrogen supply system of the fuel cell further comprises: a first pipeline and a second pipeline, one end of the first pipeline is connected to the outlet of the nitrogen discharge valve and the other end is connected to the second pipeline, one end of the second pipeline is connected to the outlet of the water discharge valve and the other end is vertically arranged.

[0014] According to some embodiments of the present application, the gas-liquid separator comprises a first shell part and a second shell part arranged at intervals along the horizontal direction, the bottom of the first shell part and the bottom of the second shell part are communicated, the top of the first shell part is provided with the inlet and the bottom is provided with the water discharge port, and the top of the second shell part is provided with the outlet.

[0015] According to some embodiments of the present application, the water discharge valve is connected at the lowest position of the bottom wall of the water tank.

[0016] The vehicle according to the second aspect of the present application comprises the hydrogen supply system of the fuel cell.

[0017] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0019] Figure 1 is a structural schematic view of the hydrogen supply system of the fuel cell according to the embodiments of the present application;

[0020] Figure 2 is a structural schematic view of the inside of the gas-liquid separator and the water tank according to the embodiments of the present application.

[0021] REFERENCE NUMERALS:

[0022] 1, stack; 2, gas-liquid separator; 3, inlet; 4, outlet; 5, water tank; 6, drain valve; 7, nitrogen discharge valve; 8, first pipeline; 9, second pipeline; 10, first housing part; 11, second housing part. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary, and the embodiments of the present application are described in detail below.

[0024] The following will be described with reference to the accompanying drawings Figures 1-2 The hydrogen supply system of the fuel cell according to the embodiments of the present application is described.

[0025] The fuel cell system mainly consists of an air supply system, a hydrogen supply system, a cooling system, a stack 1, a DC-DC converter, etc. The hydrogen supply system is an important system for ensuring hydrogen transmission, mainly consisting of a switch valve, a proportional valve, a heat exchanger, an ejector, a hydrogen pump, a gas-liquid separator, and a nitrogen discharge valve 7 and a drain valve 6, to ensure that hydrogen is continuously delivered to the anode of the fuel cell for electrochemical reaction under suitable pressure, temperature and humidity.

[0026] To improve the reaction efficiency of the fuel cell and the response rate during dynamic rapid load, an excess amount of hydrogen with a certain ratio is often introduced into the anode side of the stack 1, and after the reaction is completed, the hydrogen is discharged from the anode outlet of the anode side of the stack 1. At this time, the discharged substances contain not only a small amount of impurity gas and water, but also a part of unreacted hydrogen. At this time, the hydrogen needs to be supplied to the anode inlet of the anode side of the stack 1 for recycling and participating in the reaction again. At the same time, a drain valve 6 is arranged on the hydrogen circulation loop to discharge the accumulated liquid water. If the liquid water is not removed, with the increase of the liquid water, the liquid water will enter the stack 1 with the hydrogen circulation pump, causing the stack 1 to be flooded, resulting in low single-cell voltage of the fuel cell system, and further causing the system to stop running due to failure. In addition, during the operation of the fuel cell system, nitrogen in the air on the cathode side will penetrate to the anode side, and the amount of nitrogen will increase over time. Therefore, a nitrogen discharge valve 7 is arranged on the hydrogen circulation loop to periodically open and discharge the mixed gas to ensure the concentration of hydrogen in the hydrogen circulation. If the nitrogen is not discharged through the nitrogen discharge valve 7, it will re-enter the anode with the hydrogen circulation pump, resulting in a continuous decrease in the hydrogen concentration on the anode inlet side. If the hydrogen concentration is lower than a certain lower limit value, it will cause the single-cell voltage of the fuel cell system to be low, and further cause the system to stop running due to failure, affecting the service life of the fuel cell system and the driving experience.

[0027] As Figure 1 and Figure 2As shown, the hydrogen supply system of the fuel cell comprises: an electric pile 1, a gas-liquid separator 2 and a water tank 5. The electric pile 1 has an anode outlet (not shown in the figure), and the inlet 3 of the gas-liquid separator 2 is communicated with the anode outlet. The water tank 5 is arranged below the gas-liquid separator 2 and communicated with the water outlet of the gas-liquid separator 2, and the lower part of the water tank 5 is provided with a water discharge valve 6, and the upper part of the side wall of the water tank 5 is provided with a nitrogen discharge valve 7 which is inclined relative to the horizontal direction.

[0028] It can be understood that the nitrogen discharge valve 7 inclined relative to the horizontal direction refers to the offset or inclination angle of the nitrogen discharge valve 7 in the horizontal direction.

[0029] Specifically, the water tank 5 is installed below the gas-liquid separator 2, the water discharge valve 6 is arranged below the water tank 5, and the nitrogen discharge valve 7 is arranged above the side wall of the water tank 5, so that the impurity gas containing a small part of the anode outlet of the electric pile 1, water, and part of the unreacted hydrogen gas enter the inside of the gas-liquid separator 2 through the inlet 3 of the gas-liquid separator 2, and are subjected to gas-liquid separation treatment in the inside of the gas-liquid separator 2. The separated water flows into the inside of the water tank 5 through the water outlet and is discharged through the water discharge valve 6, the hydrogen gas enters the hydrogen circulating pump again through the outlet 4 of the gas-liquid separator 2, and the impurity gas enters the water tank 5 through the water outlet, so that the nitrogen and other impurity gases are discharged through the nitrogen discharge valve 7, thereby ensuring the normal electrochemical reaction in the electric pile 1.

[0030] Compared with arranging the water discharge valve 6 and the nitrogen discharge valve 7 on the gas-liquid separator 2, the water tank 5 is installed below the gas-liquid separator 2 in the present application, and when the water discharge valve 6 cannot be opened due to icing, a certain amount of water is temporarily stored in the water tank 5, at this time, the water discharge valve 6 is heated to melt, so as to quickly open the water discharge valve 6 to timely discharge the water in the water tank 5. When the water in the water tank 5 gradually rises to the upper limit, the water discharge valve 6 is controlled to be opened to timely discharge the water.

[0031] Moreover, the nitrogen discharge valve 7 is arranged above the side wall of the water tank 5 and inclined relative to the horizontal direction, so that the liquid water cannot be accumulated in the exhaust flow channel after shutdown, which ensures the normal use of the nitrogen discharge valve 7 and avoids the problem of icing.

[0032] Thus, the hydrogen supply system of the fuel cell of the present application, by installing the water tank 5 below the gas-liquid separator 2, arranging the water discharge valve 6 below the water tank 5 and arranging the nitrogen discharge valve 7 above the side wall of the water tank 5, compared with arranging the water discharge valve 6 and the nitrogen discharge valve 7 directly on the gas-liquid separator 2, the present application can make the water tank 5 temporarily store a certain amount of water while the water discharge valve 6 is deiced to quickly open the water discharge valve 6 to discharge the water in the water tank 5 in time when the water discharge valve 6 cannot be opened due to icing. In addition, the present application can also control the water discharge valve 6 to open to discharge the water in time when the water in the water tank 5 gradually rises to the upper limit, thereby improving the system power and avoiding power consumption. Moreover, the nitrogen discharge valve 7 is arranged obliquely so that the nitrogen discharge valve 7 does not accumulate liquid water in the exhaust flow channel after shutdown.

[0033] According to some embodiments of the present application, one end of the nitrogen discharge valve 7 is connected to the outside of the side wall of the water tank 5, and the other end is away from the outside of the side wall of the water tank 5, and is arranged upwardly inclined relative to the horizontal direction from one end to the other end of the nitrogen discharge valve 7.

[0034] Referring to Figure 2 , not only can the nitrogen discharge valve 7 accumulate liquid water in the exhaust flow channel after shutdown, but also can facilitate the rapid discharge of gas upwardly, thereby improving the working efficiency of the hydrogen supply system.

[0035] According to some embodiments of the present application, the distance between the horizontal line passing through the center of one end of the side wall of the water tank 5 to which the nitrogen discharge valve 7 is connected and the lowest part of the bottom wall of the water tank 5 is H. Wherein, the horizontal line position is defined as when the liquid level inside the water tank 5 rises to the horizontal line, the performance of the stack is affected.

[0036] Referring to Figure 2 , a horizontal line L is drawn through the center point of one end of the side wall of the water tank 5 to which the nitrogen discharge valve 7 is connected, and the vertical distance between the horizontal line L and the lowest part of the water tank 5 is H. Wherein, when the liquid level inside the water tank 5 rises to the horizontal line L, liquid water will enter the stack 1 inside with the hydrogen circulating pump, causing the stack 1 to be flooded, resulting in a decrease in the single-plate voltage of the fuel cell system, thereby affecting the performance of the stack. That is, the horizontal line position is the critical line affecting the performance of the stack, and once the liquid level inside the water tank 5 rises to the horizontal line position, the performance of the stack is affected.

[0037] Since different fuel cells have different designs, the value of H is not unique. By conducting calibration tests on different fuel cells, different H values can be obtained.

[0038] According to some embodiments of the present application, the hydrogen supply system of the fuel cell further comprises: a control module, the control module is electrically connected with the drain valve 6 and the nitrogen discharge valve 7 respectively, and is used for controlling whether the nitrogen discharge valve 7 discharges and / or drains according to the working condition of the fuel cell and controlling the working state of the drain valve 6.

[0039] That is, according to the working condition of the fuel cell, such as cold start condition, normal condition and the like, the control module controls the working state of the drain valve 6 and the nitrogen discharge valve 7. The nitrogen discharge valve 7 also has a drain function.

[0040] Generally, since there is liquid water and water vapor in the hydrogen circulation, although the engine is purged after shutdown, the liquid water is discharged, but due to the high humidity in the hydrogen circulation after the purge shutdown, a small amount of liquid water is condensed in the hydrogen circulation cavity in winter, and finally collects above the water inlet of the drain valve 6 under the action of gravity. When the air temperature drops suddenly, the water at the upper end of the drain valve 6 freezes into ice to block the water inlet, which may cause the problem of too long time for the fuel cell to start again.

[0041] Therefore, the hydrogen supply system of the fuel cell further comprises: a stack voltage monitoring module, each sub-stack in the stack 1 is electrically connected with the stack voltage monitoring module, and the stack voltage monitoring module is electrically connected with the control module.

[0042] The control module is configured to, when the fuel cell is in a cold start condition and the drain valve 6 cannot be opened, the control module acquires the voltage signal of the stack voltage monitoring module to determine whether the performance of the stack is affected to control whether the nitrogen discharge valve 7 is opened to perform the exhaust and drain functions.

[0043] Specifically, the fuel cell is purged after shutdown, at this time the drain valve 6 will discharge all the liquid water in the water tank 5, but in winter, the outside air temperature is low, and a small amount of gaseous water that is not completely discharged will condense into liquid water to the bottom of the drain valve 6 position after the hydrogen circulation cavity is gradually cooled, and ice will be formed. The nitrogen discharge valve 7 is relatively high in position and is arranged obliquely, so there is no ice formation problem.

[0044] When the cold start is performed after the start, the drain valve 6 cannot be opened, and the liquid water will continue to accumulate in the water tank 5, at this time the volume of the liquid water accumulated in the water tank 5 is small and will not affect the performance of the stack, when the liquid water accumulates to the level position of the nitrogen discharge valve 7, that is, when the performance of the stack is affected, the nitrogen discharge valve 7 plays the exhaust function and also plays the drain function, so as to ensure that the liquid water will not continue to accumulate, and the high temperature of the reacted gas and water in this period of time will melt the ice at the position of the drain valve 6, so as to realize ice melting, thereby ensuring that the drain valve 6 can normally drain.

[0045] That is, when the voltage signal of the partial sub-stacks monitored by the stack voltage monitoring module is abnormal, it indicates that the performance of the stack is affected, which means that the liquid water inside the water tank 5 has risen to the water outlet position of the nitrogen discharge valve 7, that is, the horizontal line position. At this time, due to the existence of liquid water, the nitrogen discharge valve 7 is opened to discharge water first and then discharge gas, and then the water discharge valve 6 is opened to discharge water after the ice in the water discharge valve 6 is eliminated.

[0046] Therefore, the present application solves the problem of performance degradation of the fuel cell caused by poor water discharge of the water discharge valve 5 after icing. The present application can reduce the failure and power consumption of the water discharge valve 5 without heating function, and does not need to increase the water jacket to make the system more simple.

[0047] According to some embodiments of the present application, the inside of the stack 1 and the inside of the gas-liquid separator 2 and the inside of the water tank 5 are communicated to form a hydrogen circulation cavity. The hydrogen supply system of the fuel cell further comprises: a pressure sensor, the pressure sensor is arranged in the hydrogen circulation cavity and is used for monitoring the pressure in the hydrogen circulation cavity, and the pressure sensor is electrically connected with the control module.

[0048] The control module is configured to, when the fuel cell is in a normal working condition, the control module acquires the pressure signal of the pressure sensor to judge the pressure change in the hydrogen circulation cavity to control the switching frequency and switching time of the water discharge valve 6.

[0049] Specifically, in the normal working condition not involving cold start, the water discharge valve 6 performs the water discharge function, and the nitrogen discharge valve 7 performs the gas discharge function and also performs the function of the liquid level sensor. When the water discharge valve 6 cannot timely discharge water from the water tank 5, the liquid level inside the water tank 5 gradually rises. Before rising to the water outlet of the nitrogen discharge valve 7, since the nitrogen discharge valve 7 is not submerged by water, the hydrogen circulation cavity monitored by the pressure sensor has obvious pressure change. When the liquid level inside the water tank 5 rises to the water outlet of the nitrogen discharge valve 7, the hydrogen circulation cavity monitored by the pressure sensor has no obvious pressure change. At this time, it means that the liquid level has risen to the horizontal line position, and the control module opens the nitrogen discharge valve 7 to discharge gas. Since there is liquid water, the nitrogen discharge valve 7 is opened to discharge liquid water first, and then the switching frequency and time of the water discharge valve 6 are increased to quickly discharge liquid water.

[0050] Therefore, the nitrogen discharge valve 7 has the functions of gas discharge and liquid level measurement, that is, acts as a liquid level sensor, and combines the pressure sensor in the hydrogen circulation cavity to output signals together to detect whether the liquid level reaches the horizontal line position. When the monitored pressure change in the hydrogen circulation cavity is relatively obvious, it means that the liquid level inside the water tank 5 has not risen to the horizontal line position. When the monitored pressure change in the hydrogen circulation cavity is small, it means that the nitrogen discharge valve 7 is submerged by water, that is, the liquid level inside the water tank 5 has risen to the horizontal line position. At this time, the nitrogen discharge valve 7 discharges water first, and then controls the water discharge valve 6 to speed up the water discharge efficiency.

[0051] The application solves the problem of fuel cell performance decline caused by delayed drainage in the hydrogen circulation loop of the fuel cell.

[0052] According to some embodiments of the application, the hydrogen supply system of the fuel cell further comprises: a first pipeline 8 and a second pipeline 9, one end of the first pipeline 8 is connected to the outlet 4 of the nitrogen discharge valve 7, and the other end is connected to the second pipeline 9, one end of the second pipeline 9 is connected to the outlet 4 of the drainage valve 6, and the other end of the second pipeline 9 is vertically arranged.

[0053] According to some embodiments of the application, the gas-liquid separator 2 comprises: a first shell part 10 and a second shell part 11 arranged in the horizontal direction, the bottom of the first shell part 10 and the bottom of the second shell part 11 are connected, the top of the first shell part 10 is provided with an inlet 3, and the bottom is provided with a drainage port, and the top of the second shell part 11 is provided with an outlet 4.

[0054] According to some embodiments of the application, the drainage valve 6 is connected at the lowest position of the bottom wall of the water tank 5.

[0055] According to the vehicle of the second aspect of the application, the vehicle comprises the hydrogen supply system of the fuel cell.

[0056] In the application, the drainage valve 6 is arranged at the bottom of the hydrogen circulation cavity, i.e. the bottom of the water tank 5, and the nitrogen discharge valve 7 is arranged obliquely above the side wall of the water tank 5, and the position is determined to ensure that the liquid water reaches the position and just starts to affect the performance of the stack. In this way, under normal working conditions, the nitrogen discharge valve 7 is used as the exhaust valve and also as a liquid level sensor, which outputs signals together with the pressure sensor of the hydrogen circulation to detect whether the liquid level reaches the position and control the drainage valve 6 to drain water; under the cold start working condition, if the drainage valve 6 is frozen and cannot drain water, the nitrogen discharge valve 7 functions as both the nitrogen discharge function and the drainage function, thereby ensuring that the liquid water in the hydrogen circulation is not continuously accumulated.

[0057] Therefore, the hydrogen supply system of the fuel cell of the application solves the problem of fuel cell performance decline caused by delayed drainage in the hydrogen circulation loop of the fuel cell, and the use of one liquid level sensor can be reduced by the application. In addition, the application solves the problem of fuel cell performance decline caused by poor drainage after the drainage valve 5 is frozen in the hydrogen circulation loop of the fuel cell, and the use of the drainage valve 5 with heating function can be reduced to reduce failure and power consumption, and a water jacket does not need to be added to make the system more simple. That is, the application simplifies the function of the parts, optimizes the arrangement of the hydrogen supply system, reduces the use of parts, and reduces the cost and increases the reliability of the hydrogen supply system.

[0058] In the description of the utility model, need understanding is, the orientation or position relation that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" indicate are based on the orientation or position relation shown in the drawing, just for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore can not be understood as the restriction of the utility model.

[0059] In the description of the utility model, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0060] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and its equivalents.

Claims

1. A hydrogen supply system for a fuel cell, characterized in that, include: The fuel cell stack has an anode outlet; A gas-liquid separator, wherein the inlet of the gas-liquid separator is connected to the anode outlet; A water tank is located below the gas-liquid separator and is connected to the drain outlet of the gas-liquid separator. A drain valve is provided below the water tank, and a nitrogen discharge valve inclined relative to the horizontal direction is provided above the side wall of the water tank.

2. The hydrogen supply system for a fuel cell according to claim 1, characterized in that, One end of the nitrogen venting valve is connected to the outside of the side wall of the water tank, and the other end is away from the outside of the side wall of the water tank. The valve is inclined upward relative to the horizontal direction from one end to the other end.

3. The hydrogen supply system for a fuel cell according to claim 1, characterized in that, The distance H between the horizontal line where the center of the end of the nitrogen discharge valve is connected to the side wall of the water tank and the lowest point of the bottom wall of the water tank in the vertical direction; The horizontal line position is defined as the point at which the performance of the fuel cell stack begins to be affected when the liquid level inside the water tank rises to the horizontal line.

4. The hydrogen supply system for a fuel cell according to claim 3, characterized in that, Also includes: The control module is electrically connected to the drain valve and the nitrogen discharge valve, respectively, and is used to control whether the nitrogen discharge valve performs venting and / or drainage and to control the working state of the drain valve according to the working conditions of the fuel cell.

5. The hydrogen supply system for a fuel cell according to claim 4, characterized in that, Also includes: A fuel cell stack voltage monitoring module is provided, and each sub-stack in the fuel cell stack is electrically connected to the fuel cell stack voltage monitoring module. The fuel cell stack voltage monitoring module is electrically connected to the control module. The control module is configured to, when the fuel cell is in a cold start condition and the drain valve cannot be opened, acquire the voltage signal of the fuel cell stack voltage monitoring module to determine whether the performance of the fuel cell stack is affected, and control whether the nitrogen venting valve is opened to perform venting and drainage functions.

6. The hydrogen supply system for a fuel cell according to claim 4, characterized in that, The interior of the fuel cell stack is connected to the interior of the gas-liquid separator and the interior of the water tank to form a hydrogen circulation chamber; it also includes: A pressure sensor is disposed in the hydrogen circulation chamber to monitor the pressure inside the hydrogen circulation chamber. The pressure sensor is electrically connected to the control module. The control module is configured to, when the fuel cell is in normal operating condition, acquire the pressure signal from the pressure sensor to determine the magnitude of pressure change inside the hydrogen circulation chamber and control the switching frequency and switching time of the drain valve.

7. The hydrogen supply system for a fuel cell according to claim 1, characterized in that, Also includes: A first pipe and a second pipe, wherein one end of the first pipe is connected to the outlet of the nitrogen venting valve and the other end is connected to the second pipe, and one end of the second pipe is connected to the outlet of the drain valve and the other end is vertically arranged.

8. The hydrogen supply system for a fuel cell according to claim 1, characterized in that, The gas-liquid separator includes: a first housing portion and a second housing portion arranged at intervals along a horizontal direction, the bottom of the first housing portion and the bottom of the second housing portion being connected, the first housing portion having an inlet at its top and a drain outlet at its bottom, and the second housing portion having an outlet at its top.

9. The hydrogen supply system for a fuel cell according to claim 1, characterized in that, The drain valve is connected to the lowest position on the bottom wall of the water tank.

10. A vehicle, characterized in that, The hydrogen supply system includes the fuel cell according to any one of claims 1-9.

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