Purging device for fuel cell stack and fuel cell system

Abstract

The utility model discloses a purging device for a fuel cell stack and a fuel cell system. The purging device for the fuel cell stack comprises an air inlet channel, an air bypass valve, an air compressor, a purging fan and a first bypass branch, one end of the air inlet channel is used for being communicated with the stack, and the other end of the air inlet channel is an air inlet; the air compressor is arranged on the air inlet channel, and the input end of the air compressor is communicated with the air inlet; one end of the first bypass branch is connected with the output end of the air compressor, and the other end of the first bypass branch is used for being communicated with an electric pile; an air bypass valve and a purging fan are arranged on the first bypass branch, and air for purging the electric pile enters the electric pile through the first purging passage. The fuel cell system solves the technical problem that the power consumption of the system is increased due to the fact that air passes through a cooling water pump and a cooling fan when the electric pile in the fuel cell system is blown in the prior art.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, and in particular to a purge device for a fuel cell stack and a fuel cell system. Background Art

[0002] Fuel cell systems typically use air bypassed from the intercooler for purging. If the air temperature is high, the cooling water pump and cooling fan in the fuel cell system's cooling circuit must be operated to lower the water temperature within the cooling circuit. Low-temperature water then enters the intercooler's wet channel to cool the air in the intercooler's dry channel, further reducing the air bypassed from the intercooler. However, this purge process consumes significant energy from the cooling water pump and cooling fan.

[0003] To address the above-mentioned problems, no effective solutions have been proposed so far. Utility Model Content

[0004] The main purpose of the embodiments of the present utility model is to provide a purging device for a fuel cell stack and a fuel cell system, so as to at least solve the technical problem in the related art that when the air passes through the cooling water pump and the cooling fan when purging the stack in the fuel cell system, the system power consumption increases.

[0005] To achieve the above-mentioned purpose, the utility model provides a purge device for a fuel cell stack, comprising: an air intake channel (1), an air bypass valve (2), an air compressor (3), a purge fan (4), and a first bypass branch, wherein one end of the air intake channel (1) is used to communicate with the fuel cell stack (101), and the other end of the air intake channel (1) is an air inlet (102); the air compressor (3) is arranged on the air intake channel (1), and the input end of the air compressor (3) is communicated with the air inlet (102); the first bypass branch One end of the through branch is connected to the output end of the air compressor (3), and the other end of the first bypass branch is used to communicate with the fuel cell stack (101); an air bypass valve (2) and a purge fan (4) are provided on the first bypass branch, wherein air used for purging the fuel cell stack (101) enters the fuel cell stack (101) through the first purge passage, and the first purge passage comprises an air inlet (102), an air compressor (3), an air bypass valve (2) and a purge fan (4), and the purge fan (4) is used to adjust the temperature and flow of the air purging the fuel cell stack (101).

[0006] Optionally, the above-mentioned device further includes: an air filter (5), wherein the air filter (5) is arranged on the air intake channel (1), the input end of the air filter (5) is connected to the air intake port (102), and the output end of the air filter (5) is connected to the input end of the air compressor (3) for filtering the air.

[0007] Optionally, the device further comprises: an air exhaust channel (6), wherein the air exhaust channel (6) is used to be connected to the battery stack (101) and to discharge air blown through the battery stack (101).

[0008] Optionally, the device further comprises: a first temperature sensor (7), wherein the first temperature sensor (7) is used to be connected to the battery stack (101) and to measure the temperature of the battery stack (101).

[0009] Optionally, the device further comprises: a second bypass branch, wherein one end of the second bypass branch is connected to the air inlet (102), and the other end of the second bypass branch is connected to the air bypass valve (2) and connected to the first bypass branch, wherein air for purging the fuel cell stack (101) can optionally enter the fuel cell stack (101) through the second purge passage, wherein the second purge passage comprises the air inlet (102), the air bypass valve (2) and the purge fan (4).

[0010] Optionally, the air bypass valve (2) comprises a three-way valve.

[0011] Optionally, the device further comprises: a second temperature sensor (8), wherein the second temperature sensor (8) is arranged on the first bypass branch, located between the air bypass valve (2) and the purge fan (4), and is used to measure the temperature of the air transmitted to the purge fan (4) through the air bypass valve (2).

[0012] According to another aspect of an embodiment of the present invention, a fuel cell system is provided, comprising a fuel cell stack (101) and a purge device for the fuel cell stack (101).

[0013] Optionally, the fuel cell system further comprises: an air cooling module (9), wherein the air cooling module (9) is arranged on the air intake channel (1) and located at the output end of the air compressor (3), wherein the air cooling module (9) is used to cool the air entering the fuel cell stack (101) from the air compressor (3).

[0014] Optionally, the fuel cell system further comprises: an air humidification module (10), wherein the air humidification module (10) is arranged on the air inlet channel (1) and is located at the output end of the air cooling module (9), wherein the air humidification module (10) is used to increase the humidity of the air entering the fuel cell stack (101) from the air compressor (3) through the air cooling module (9).

[0015] In the embodiment of the utility model, through the air intake channel (1), the air bypass valve (2), the air compressor (3), the purge fan (4), and the first bypass branch, wherein one end of the air intake channel (1) is used to communicate with the battery stack (101), and the other end of the air intake channel (1) is the air intake port (102); the air compressor (3) is arranged on the air intake channel (1), and the input end of the air compressor (3) is communicated with the air intake port (102); one end of the first bypass branch is connected to the output end of the air compressor (3), and the other end of the first bypass branch is used to communicate with the battery stack (101); the air bypass valve (2 ) and a purge fan (4), wherein air for purging the fuel cell stack (101) enters the fuel cell stack (101) through a first purge passage, the first purge passage comprising an air inlet (102), an air compressor (3), an air bypass valve (2) and a purge fan (4), the purge fan (4) being used to adjust the temperature and flow of the air for purging the fuel cell stack (101), thereby achieving the purpose of not passing through a cooling water pump and a heat dissipation fan during the purge process, thereby achieving the technical effect of reducing the power consumption of the fuel cell system, and further solving the technical problem in the related art that the air passes through a cooling water pump and a heat dissipation fan when purging the fuel cell stack in the fuel cell system, resulting in an increase in system power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 This is a structural block diagram of a purge device for a fuel cell stack provided according to an embodiment of the present utility model;

[0018] Figure 2 It is a structural block diagram of an optional fuel cell system provided according to an embodiment of the present utility model.

[0019] The above drawings include the following reference numerals:

[0020] 1. Air intake channel; 2. Air bypass valve; 3. Air compressor; 4. Purge fan; 5. Air filter; 6. Air exhaust channel; 7. First temperature sensor; 8. Second temperature sensor; 9. Air cooling module; 10. Air humidification module; 101. Fuel cell stack; 102. Air intake port. DETAILED DESCRIPTION

[0021] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0024] In this utility model, unless otherwise indicated, directional terms such as "upper, lower, top, and bottom" generally refer to the directions shown in the accompanying drawings, or to the components themselves in the vertical, perpendicular, or gravitational direction. Similarly, for ease of understanding and description, "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but these directional terms are not intended to limit this utility model. During normal operation, hydrogen fuel cells produce a large amount of water due to the catalytic reaction between the anode and cathode. Excessive accumulation of water can cause flooding of the proton exchange membrane. Therefore, the stack needs to be purged to remove excess water from the stack. However, related art uses air after passing through the air compressor 3 for purging. To prevent the purge gas entering the stack from overheating, a cooling water pump in the cooling circuit is typically used to cool the purge gas. This increases the gas flow rate through the cooling water pump, requiring the pump to increase its speed to dissipate heat, which increases the system's power consumption. Furthermore, the increased gas flow distribution also limits the selection of water pumps. Generally, higher-powered and larger pumps are used, resulting in increased costs.

[0025] Therefore, the utility model provides a low-power purge device. Figure 1 This is a structural block diagram of a purge device for a fuel cell stack provided according to an embodiment of the present invention, such as Figure 1As shown, the purging device for the fuel cell stack includes: an air intake channel 1, an air bypass valve 2, an air compressor 3, a purge fan 4, and a first bypass branch, wherein one end of the air intake channel 1 is used to communicate with the fuel cell stack 101, and the other end of the air intake channel 1 is an air inlet 102; the air compressor 3 is arranged on the air intake channel 1, and the input end of the air compressor 3 is connected to the air inlet 102; one end of the first bypass branch is connected to the output end of the air compressor 3, and the other end of the first bypass branch is used to communicate with the fuel cell stack 101; an air bypass valve 2 and a purge fan 4 are arranged on the first bypass branch, wherein the air used to purge the fuel cell stack 101 enters the fuel cell stack 101 through the first purge channel, and the first purge channel includes the air inlet 102, the air compressor 3, the air bypass valve 2 and the purge fan 4, and the purge fan 4 is used to adjust the temperature and flow of the air purging the fuel cell stack 101.

[0026] like Figure 1 As shown, a purge fan 4 is provided in the present invention to adjust the temperature and flow of the air used to purge the fuel cell stack 101. One end of the air intake channel 1 is connected to the fuel cell stack 101, and the air intake port 102 is connected to the input end of the air compressor 3, and the output end of the air compressor 3 is connected to the fuel cell stack 101 through the air intake channel 1. The output end of the air compressor 3 is also connected to the first bypass branch, wherein an air bypass valve 2 and a purge fan 4 are provided on the first bypass branch, and the interface of the air bypass valve 2 is connected to the input end of the purge fan 4, and the output end of the purge fan 4 is then connected to the fuel cell stack 101 through the first bypass branch, forming a first purge passage, so that the air used to purge the fuel cell stack can enter the fuel cell stack 101 through the first purge passage. When the stack needs to be purged, the air inlet 102 will output air, a portion of which is used for the purge operation. The air used to purge the stack 101 will pass through the first purge path, that is, pass through the air compressor 3, the air bypass valve 2, and the purge fan 4 in sequence to enter the stack 101. Among them, the air compressor 3 is used to compress the air, so the temperature of the gas passing through the air compressor 3 will increase. In a low-temperature environment, if the excess moisture in the fuel cell system is not discharged in time, it may cause the stack 101 to freeze. In this case, when the purge operation is performed, the temperature of the air used to purge the stack 101 is relatively high, which can avoid the problem of moisture freezing in the stack 101. Therefore, the higher temperature gas after passing through the air compressor 3 can be used for purging, and by adjusting the speed of the purge fan 4, the temperature of the gas used to purge the stack 101 is adjusted to an appropriate temperature, thereby improving the efficiency of the purge. In addition, using the purge fan 4 to adjust the temperature reduces system power consumption and reduces costs.

[0027] Through the air intake channel 1, the air bypass valve 2, the air compressor 3, and the purge fan 4, wherein one end of the air intake channel 1 is connected to the fuel cell stack 101, and the other end of the air intake channel 1 is the air intake port 102; the air compressor 3 is arranged on the air intake channel 1, and the input end of the air compressor 3 is connected to the air intake port 102; one end of the first bypass branch is connected to the output end of the air compressor 3, and the other end of the first bypass branch is connected to the fuel cell stack 101; the air bypass valve 2 and the purge fan 4 are arranged on the first bypass branch to purge the fuel cell stack 1 The air in the fuel cell stack 101 passes through the first purge passage, wherein the first purge passage includes an air inlet 102, an air compressor 3, an air bypass valve 2 and a purge fan 4. The purge fan 4 can adjust the temperature and flow of the air purging the fuel cell stack 101, thereby achieving the purpose of not passing through the cooling water pump and the cooling fan during the purge process, thereby achieving the technical effect of reducing the power consumption of the fuel cell system, and further solving the technical problem in the related technology that the air passes through the cooling water pump and the cooling fan when purging the fuel cell stack in the fuel cell system, resulting in increased system power consumption.

[0028] As an optional embodiment, the above-mentioned device also includes: an air filter 5, wherein the air filter 5 is arranged on the air intake channel 1, the input end of the air filter 5 is connected to the air intake port 102, and the output end of the air filter 5 is connected to the input end of the air compressor 3 for filtering the air.

[0029] Alternatively, as Figure 1As shown, the purge device for the fuel cell stack also includes an air filter 5. The air filter 5 is positioned on the air intake passage 1, between the air inlet 102 and the air compressor 3, to filter impurities and harmful gases from the air. It also blocks moisture from the air, preventing it from entering the fuel cell stack 101. The air filter 5 can include a pre-filter, a high-efficiency filter, and an activated carbon filter. Air first passes through the pre-filter, which removes large particles such as dust, hair, and outdoor particulate matter. Then, the air passes through the high-efficiency filter, which removes smaller particles such as bacteria, viruses, and pollen. Finally, the air passes through the activated carbon filter, which removes odors and harmful gases such as formaldehyde and benzene. Moisture-absorbing chemicals, such as desiccants, are also placed in the air filter 5. As the air passes through these chemicals, they absorb moisture from the air, drying it out. Through these operations, the air filter 5 effectively removes impurities and moisture from the air, preventing excessive impurities from affecting the fuel cell stack 101. The purge air is output from the air exhaust duct 6, passes through the air filter 5 to block liquid water in the air and filter out impurities and harmful substances, and then passes through the air compressor 3, the air bypass valve 2, and the purge fan 4 to enter the fuel cell stack 101. This allows for a better purge operation and prevents the stack 101 from being affected by liquid water in the air. At the same time, the air used for the catalytic reaction can also pass through the air filter 5 to filter out impurities in the air, making the air more suitable for the catalytic reaction.

[0030] As an optional embodiment, the above-mentioned device further includes: an air exhaust channel 6, wherein the air exhaust channel 6 is used to be connected to the fuel cell stack 101 and to discharge the air blown through the fuel cell stack 101.

[0031] Alternatively, as Figure 1 As shown, the purge device for the fuel cell stack also includes an air exhaust channel 6, which is connected to the fuel cell stack 101. The air purged through the fuel cell stack 101 can be discharged through the air exhaust channel 6, thereby preventing air from concentrating inside the fuel cell stack 101 and causing a decrease in the concentration of hydrogen required for the reaction. At the same time, the remaining gas after the catalytic reaction can also be discharged through the air exhaust channel 6.

[0032] As an optional embodiment, the above-mentioned device further includes: a first temperature sensor 7 , wherein the first temperature sensor 7 is used to be connected to the fuel cell stack 101 and to measure the temperature of the fuel cell stack 101 .

[0033] Alternatively, as Figure 1As shown, the purging device for the fuel cell stack may further include a first temperature sensor 7. The first temperature sensor 7 may be connected to the stack 101 to measure the temperature of the stack 101. The temperature of the stack 101 may determine the temperature of the air used to purge the stack 101. When it is measured that the temperature of the stack 101 is low, the temperature of the air used to purge the stack 101 may be appropriately increased to prevent the moisture in the stack 101 from freezing. When it is measured that the temperature of the stack 101 is at room temperature or at a high temperature, the temperature of the air used to purge the stack 101 may be appropriately lowered to avoid the problem of proton exchange membrane drying out after the gas enters the stack 101.

[0034] As an optional embodiment, the above-mentioned device also includes: a second bypass branch, wherein one end of the second bypass branch is connected to the air inlet 102, and the other end of the second bypass branch is connected to the air bypass valve 2 and connected to the first bypass branch, wherein the air used to purge the fuel cell stack 101 can selectively enter the fuel cell stack 101 through the second purge passage, wherein the second purge passage includes the air inlet 102, the air bypass valve 2 and the purge fan 4.

[0035] Optionally, one end of the second bypass branch is connected to the air inlet 102, and the other end is connected to the air bypass valve 2. The air inlet 102, the air bypass valve 2, and the purge fan 4 constitute a second purge passage, and the air used to purge the fuel cell 101 can optionally enter the fuel cell 101 through the second purge passage. Because the higher temperature air compressed by the air compressor 3 may cause the proton exchange membrane to dry out after entering the fuel cell, there is no need to worry about the water in the fuel cell 101 freezing in a normal temperature environment or a high temperature environment, so lower temperature air can be used directly for purging. The air that has passed through the air filter 5 can also be directly passed through the air bypass valve 2 and the purge fan 4 to purge the fuel cell 101.

[0036] As an optional embodiment, the air bypass valve 2 includes a three-way valve.

[0037] Optionally, the air bypass valve 2 includes a three-way valve, and the switching state of different interfaces of the valve can be adjusted so that the passage of air for purging the fuel cell stack 101 can be switched between the first purge passage and the second purge passage. In the air bypass valve 2, when the interface corresponding to the air compressor 3 and the interface connected to the purge fan 4 are opened, and the interface corresponding to the air compressor 3 is closed, the air used to purge the fuel cell stack 101 enters the fuel cell stack 101 through the first purge passage. In the air bypass valve 2, when the interface corresponding to the second bypass branch and the interface connected to the purge fan 4 are opened, and the interface corresponding to the air compressor 3 is closed, the air used to purge the fuel cell stack 101 enters the fuel cell stack 101 through the second purge passage. Specifically, the switching state of different interfaces in the air bypass valve 2 can be adjusted according to the temperature of the fuel cell stack 101. When the temperature of the fuel cell stack 101 is low, the interface corresponding to the air compressor 3 and the interface connected to the purge fan 4 can be opened, so that the air path for purging the fuel cell stack 101 is switched to the first purge path; when the fuel cell stack 101 is not in a low-temperature environment, the interface corresponding to the second bypass branch and the interface connected to the purge fan 4 can be opened, so that the air path for purging the fuel cell stack 101 is switched to the second purge path.

[0038] As an optional embodiment, the above-mentioned device also includes: a second temperature sensor 8, wherein the second temperature sensor 8 is arranged on the first bypass branch, located between the air bypass valve 2 and the purge fan 4, and is used to measure the temperature of the air transmitted to the purge fan 4 through the air bypass valve 2.

[0039] Alternatively, as Figure 1 As shown, the purge device for the fuel cell stack may also include a second temperature sensor 8. The second temperature sensor 8 may be set in the first bypass branch, between the air bypass valve 2 and the purge fan 4, to measure the temperature of the air transmitted to the purge fan 4 through the air bypass valve 2. According to the temperature of the air transmitted to the purge fan 4 through the air bypass valve 2, the rotation speed of the purge fan 4 can be adjusted, thereby controlling the temperature and flow rate of the air used to purge the stack 101, so that it can perform the purge work better. For example, when the air temperature measured by the second temperature sensor 8 is high, in order to avoid the problem of proton exchange membrane drying after entering the stack 101, the rotation speed of the purge fan 4 can be increased, thereby reducing the temperature of the air used to purge the stack 101, so that the purge can be performed better.

[0040] Figure 2 This is a structural block diagram of an optional fuel cell system provided according to an embodiment of the present utility model, such as Figure 2 As shown, the fuel cell system includes: a fuel cell stack 101 and any one of the above-mentioned purge devices for fuel cell stacks.

[0041] like Figure 2As shown, the fuel cell system includes a stack 101 and a purge device, wherein the purge device includes an air intake channel 1, an air compressor 3, an air bypass valve 2 and a purge fan 4, and may also include an air filter 5, an air exhaust channel 6, a first temperature sensor 7 and a second temperature sensor 8. The working principle of the fuel cell system is to use hydrogen as fuel, and utilize hydrogen and oxygen to undergo a chemical reaction to generate electrons and generate current. Part of the air output from the air intake channel 1 will be used to purge the stack 101, and the other part will provide oxygen for the occurrence of the chemical reaction. After the air entering the stack 101 undergoes purging and chemical reaction, the remaining gas can be output through the air exhaust channel 6 to avoid accumulation inside the stack 101, resulting in a decrease in the concentration of hydrogen that reacts, affecting the progress of the reaction, and thus affecting the operation of the fuel cell system.

[0042] As an optional embodiment, the fuel cell system also includes: an air cooling module 9, wherein the air cooling module 9 is arranged on the air intake channel 1, located at the output end of the air compressor 3, wherein the air cooling module 9 is used to cool the air entering the fuel cell stack 101 from the air compressor 3.

[0043] Alternatively, as Figure 2 As shown, the fuel cell system also includes an air cooling module 9. The air cooling module 9 is arranged on the air inlet channel 1, between the air compressor 3 and the fuel cell stack 101. The input end of the air cooling module 9 is connected to the output end of the air compressor 3, and the output end of the air cooling module 9 is connected to the fuel cell stack 101. The air used to enter the fuel cell stack 101 for the catalytic reaction passes through the air inlet 102, the air compressor 3, and the air cooling module 9, and then enters the fuel cell stack 101 for chemical reaction. The air cooling module 9 can cool the air used to enter the fuel cell stack 101 for the catalytic reaction. Because the fuel cell stack 101 in the current fuel cell generates electricity through the reaction of hydrogen and oxygen, this reaction process requires appropriate temperature conditions to achieve optimal results. If the temperature of the air entering the fuel cell stack 101 for the catalytic reaction is too high, it will cause the catalyst in the fuel cell stack 101 to deactivate, thereby affecting the efficiency and life of the fuel cell stack 101. Therefore, it is necessary to control the temperature of the air entering the fuel cell stack 101 for the catalytic reaction and keep it within an appropriate temperature range. Therefore, the air used to enter the fuel cell stack 101 for the catalytic reaction is cooled to a suitable temperature by the air cooling module 9, which can ensure that the reaction process in the fuel cell stack 101 can continue and remain efficient. In addition, the air cooling module 9 can also help control the temperature of the fuel cell stack 101 to prevent damage caused by overheating. Therefore, the air used to enter the fuel cell stack 101 for the catalytic reaction is processed by the air cooling module 9 to ensure the safe operation and long-term stability of the fuel cell stack.

[0044] As an optional embodiment, the fuel cell system also includes: an air humidification module 10, wherein the air humidification module 10 is arranged on the air intake channel 1, located at the output end of the air cooling module 9, wherein the air humidification module 10 is used to increase the humidity of the air entering the fuel cell stack 101 from the air compressor 3 through the air cooling module 9.

[0045] Alternatively, as Figure 2 As shown, the fuel cell system may also include an air humidification module 10, wherein the air humidification module 10 is disposed between the air cooling module 9 and the fuel cell stack 101. The input end of the air humidification module 10 is connected to the output end of the air cooling module 9, and the output end of the air humidification module 10 is connected to the fuel cell stack 101. Air used for the catalytic reaction in the fuel cell stack 101 can enter the fuel cell stack 101 through the air inlet, the air compressor 3, the air cooling module 9, and the air humidification module 10 to undergo a chemical reaction. The air humidification module 10 can increase the humidity of the air used for the chemical reaction, making it more suitable for the catalytic reaction, improving the efficiency of the catalytic reaction, and thereby improving the power generation efficiency of the fuel cell system. Because fuel cells require appropriate humidity to maintain normal operation, overly dry or overly humid air can affect the performance and lifespan of the fuel cell. Therefore, the air humidification module 10 maintains appropriate humidity for the air used to enter the fuel cell stack 101 for the catalytic reaction, thereby helping to maintain appropriate humidity in the fuel cell system, ensuring stable operation of the fuel cell and extending the lifespan of the fuel cell system.

[0046] like Figure 2In the optional embodiment shown, in the fuel cell system, the air intake port 102, the air filter 5, the air compressor 3, the air bypass valve 2, and the purge fan 4 constitute a first purge channel; the air intake port 102, the air filter 5, the air bypass valve 2, and the purge fan 4 constitute a second purge channel; the air intake port 102, the air filter 5, the air compressor 3, the air cooling module 9, and the air humidification module 10 constitute a transmission channel for air entering the fuel cell stack 101 for catalytic reaction. So that the air used to purge the fuel cell 101 can enter the fuel cell 101 for purging through the first purge channel, that is, the air inlet 102, the air filter 5, the air compressor 3, the air bypass valve 2, and the purge fan 4, and be discharged through the air exhaust channel 6 after the purging is completed, wherein the second temperature sensor 8 is located between the air bypass valve 2 and the purge fan 4 to measure the temperature of the air; the air used to purge the fuel cell 101 can also enter the fuel cell 101 for purging through the second purge channel, that is, the air inlet channel 1, the air filter 5, the air bypass valve 2, and the purge fan 4, and be discharged through the air exhaust channel 6 after the purging is completed; the air used to enter the fuel cell 101 for catalytic reaction can enter the fuel cell 101 for catalytic reaction through the air inlet 102, the air filter 5, the air compressor 3, the air cooling module 9, and the air humidification module 10 to perform a catalytic reaction, and the remaining gas after the reaction is discharged through the air exhaust channel 6. The purpose of not passing through the cooling water pump and the cooling fan during the purging process is achieved, thereby reducing the power consumption of the fuel cell system and lowering the cost.

[0047] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0048] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A purge device for a fuel cell stack, characterized in that: include: Air intake passage (1), air bypass valve (2), air compressor (3), purge fan (4), first bypass branch, wherein: One end of the air intake channel (1) is used to communicate with the battery stack (101), and the other end of the air intake channel (1) is an air intake port (102); The air compressor (3) is arranged on the air intake passage (1), and the input end of the air compressor (3) is in communication with the air intake port (102); One end of the first bypass branch is connected to the output end of the air compressor (3), and the other end of the first bypass branch is used to communicate with the fuel cell stack (101); The air bypass valve (2) and the purge fan (4) are arranged on the first bypass branch, wherein the air for purging the fuel cell stack (101) enters the fuel cell stack (101) through a first purge passage, and the first purge passage comprises the air inlet (102), the air compressor (3), the air bypass valve (2) and the purge fan (4), and the purge fan (4) is used to adjust the temperature and flow rate of the air for purging the fuel cell stack (101).

2. The device according to claim 1, characterized in that Also includes: An air filter (5), wherein The air filter (5) is arranged on the air intake passage (1), the input end of the air filter (5) is connected to the air intake port (102), and the output end of the air filter (5) is connected to the input end of the air compressor (3), for filtering the air.

3. The device according to claim 1, characterized in that Also includes: An air exhaust passage (6), wherein The air exhaust channel (6) is used to be connected to the battery stack (101) and to exhaust the air that has blown through the battery stack (101).

4. The device according to claim 1, characterized in that Also includes: A first temperature sensor (7), wherein The first temperature sensor (7) is used to be connected to the fuel cell stack (101) and to measure the temperature of the fuel cell stack (101).

5. The device according to claim 1, characterized in that Also included is a second bypass branch, wherein: One end of the second bypass branch is connected to the air inlet (102), and the other end of the second bypass branch is connected to the air bypass valve (2) and connected to the first bypass branch, wherein the air used to purge the fuel cell stack (101) can selectively enter the fuel cell stack (101) through a second purge passage, and the second purge passage includes the air inlet (102), the air bypass valve (2) and the purge fan (4).

6. The device according to claim 5, characterized in that The air bypass valve (2) comprises a three-way valve.

7. The device according to claim 1, characterized in that Also includes: A second temperature sensor (8), wherein The second temperature sensor (8) is arranged on the first bypass branch, between the air bypass valve (2) and the purge fan (4), and is used to measure the temperature of the air transmitted to the purge fan (4) through the air bypass valve (2).

8. A fuel cell system, characterized in that: The invention comprises a fuel cell stack (101) and a purge device for a fuel cell stack (101) according to any one of claims 1 to 7.

9. The fuel cell system according to claim 8, characterized in that: Also includes: An air cooling module (9), wherein: The air cooling module (9) is arranged on the air intake passage (1) and is located at the output end of the air compressor (3), wherein the air cooling module (9) is used to cool the air entering the fuel cell stack (101) from the air compressor (3).

10. The fuel cell system according to claim 9, characterized in that: Also includes: An air humidification module (10), wherein: The air humidification module (10) is arranged on the air intake passage (1) and is located at the output end of the air cooling module (9), wherein the air humidification module (10) is used to increase the humidity of the air entering the fuel cell stack (101) from the air compressor (3) through the air cooling module (9).

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