Fuel cell exhaust system and fuel cell system

Abstract

The utility model provides a fuel cell exhaust system and a fuel cell system.The fuel cell exhaust system comprises a tail exhaust pipeline, a first interface pipeline arranged on the tail exhaust pipeline and a pressure detection unit arranged on the first interface pipeline; a first flow channel is arranged in the tail exhaust pipeline, an inlet of the first interface pipeline is connected with an electric pile purging pipeline of the fuel cell, an outlet of the first interface pipeline is connected with the first flow channel, and an outlet of the first flow channel is arranged close to an outlet of the tail exhaust pipeline. According to the fuel cell exhaust system disclosed by the utility model, the risk of backward flow of hydrogen caused by too small pressure of fuel cell stack purge gas can be reduced, and cracking of a fuel cell stack shell caused by too large pressure of fuel cell stack purge gas can be avoided, so that the safety of a fuel cell can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell exhaust system. At the same time, the utility model also relates to a fuel cell system provided with the fuel cell exhaust system. Background Art

[0002] At present, the air module in a fuel cell mainly consists of components such as an air filter, an air compressor, an intercooler, a humidifier and their related pipelines. External air enters the fuel cell system, undergoes processes such as filtration, pressurization, cooling and humidification, reacts with hydrogen inside the stack, and the generated mixed gas and water pass through a hydrogen circulation pump, a water tank and various valve blocks, and finally are discharged out of the system.

[0003] In the prior art, in order to prevent the hydrogen concentration in the stack housing from exceeding the standard, a purge pipeline is usually added. Gas enters the purge pipeline from the air compressor to purge the stack housing, and the purged gas is finally discharged out of the system. Due to deficiencies in the structural design of the existing fuel cell exhaust system, it is impossible to well control the pressure of the purge gas, which easily causes problems such as hydrogen backflow into the stack due to too small gas pressure or cracking of the stack housing due to too large gas pressure, which is not conducive to improving the safety of the fuel cell. Summary of the Utility Model

[0004] In view of this, the utility model aims to propose a fuel cell exhaust system to improve the safety of the fuel cell system.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A fuel cell exhaust system includes a tail exhaust pipeline, a first interface pipeline provided on the tail exhaust pipeline, and a pressure detection unit provided on the first interface pipeline;

[0007] A first flow channel is provided in the tail exhaust pipeline. The inlet of the first interface pipeline is connected to the stack purge pipeline of the fuel cell, the outlet of the first interface pipeline is connected to the first flow channel, and the outlet of the first flow channel is arranged close to the outlet of the tail exhaust pipeline.

[0008] Furthermore, a first convex portion protruding into the tail exhaust pipeline is provided on the inner wall of the tail exhaust pipeline, and the first flow channel is arranged in the first convex portion.

[0009] Further, a second interface pipeline is provided on the tail exhaust pipeline, and the inlet of the second interface pipeline is connected to the pressure relief pipeline of the fuel cell; a second flow channel is provided in the first convex part, the outlet of the second interface pipeline is connected to the second flow channel, and the outlet of the second flow channel is arranged close to the outlet of the tail exhaust pipeline, and / or the second interface pipeline is located between the first interface pipeline and the outlet of the tail exhaust pipeline.

[0010] Further, it further includes a controller and an air compressor; both the pressure detection unit and the air compressor are connected to the controller, the output end of the air compressor is connected to the stack purge pipeline, or a regulating valve for controlling the gas flow is provided on the stack purge pipeline, both the pressure detection unit and the regulating valve are connected to the controller, and the output end of the air compressor is connected to the stack purge pipeline.

[0011] Further, a third interface pipeline is provided on the tail exhaust pipeline, and the inlet of the third interface pipeline is connected to the drainage pipeline of the fuel cell; a third flow channel is provided in the tail exhaust pipeline, the outlet of the third interface pipeline is connected to the third flow channel, and the outlet of the third flow channel is arranged close to the outlet of the tail exhaust pipeline.

[0012] Further, a fourth interface pipeline is provided on the tail exhaust pipeline, the inlet of the fourth interface pipeline is connected to the nitrogen discharge pipeline of the fuel cell, and the outlet of the fourth interface pipeline is connected to the third flow channel; and / or a second convex part protruding into the tail exhaust pipeline is provided on the inner wall of the tail exhaust pipeline, and the third flow channel is arranged in the second convex part.

[0013] Further, a hydrogen concentration detection unit is provided on the tail exhaust pipeline, and the hydrogen concentration detection unit is arranged close to the exhaust port of the tail exhaust pipeline; and / or an air valve is provided at the inlet of the tail exhaust pipeline.

[0014] Further, a fifth interface pipeline is provided on the tail exhaust pipeline, the inlet of the fifth interface pipeline is connected to the outlet of the intercooler of the fuel cell, and the outlet of the fifth interface pipeline is connected to the inside of the tail exhaust pipeline; and / or a sixth interface pipeline is provided on the tail exhaust pipeline, the inlet of the sixth interface pipeline is connected to the purge outlet of the air compressor of the fuel cell, and the outlet of the sixth interface pipeline is connected to the inside of the tail exhaust pipeline.

[0015] Further, an installation part is provided on the tail exhaust pipeline, and the installation part fixes the tail exhaust pipeline in the fuel cell; and / or a wire harness fixing part for fixing the wire harness is provided on the tail exhaust pipeline.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] For the fuel cell exhaust system described in the present utility model, by providing a first interface pipeline connected to the stack purge pipeline, and a first flow channel connected to the first interface pipeline within the tail exhaust pipeline, and the outlet of the first flow channel being arranged close to the outlet of the tail exhaust pipeline, the stack purge gas can be discharged separately from other gas flows, thereby reducing the risk of hydrogen backflow into the stack. At the same time, the setting of the pressure detection unit can monitor the pressure of the stack purge gas, which can not only cooperate with the first flow channel to reduce the risk of hydrogen backflow caused by too low pressure, but also avoid cracking of the stack housing due to excessive purge pressure. Thus, it is beneficial to improve the safety of the fuel cell.

[0018] Secondly, a first convex portion protruding into the tail exhaust pipeline is provided on the inner wall of the tail exhaust pipeline, and the first flow channel is arranged in the first convex portion, which is beneficial for the layout of the first flow channel and for separating and discharging the stack purge gas from other discharged gases in the tail exhaust pipeline. By cooperatively providing a second interface pipeline and a second flow channel integrated on the first convex portion, not only can the gas discharged from the pressure relief pipeline be separated and discharged from other discharged gases, but also it is beneficial to improve the overall integration degree of the device. And the outlet of the second flow channel is arranged close to the outlet of the tail exhaust pipeline, which is beneficial for reducing the risk of hydrogen backflow. The second interface pipeline is located between the first interface pipeline and the outlet of the tail exhaust pipeline, which is beneficial for improving the layout rationality of the tail exhaust pipeline and each interface pipeline, saving space occupancy while avoiding intersection between the first flow channel and the second flow channel.

[0019] Moreover, the cooperative setting of the third interface pipeline, the fourth interface pipeline and the third flow channel can, while improving the integration degree of the fuel cell exhaust system, achieve separation and discharge from other discharged gases and avoid the occurrence of hydrogen backflow. The setting of the second convex portion is beneficial for the layout and design of the third flow channel and for separating and discharging the hydrogen in the drainage pipeline and the nitrogen discharge pipeline from other discharged gases. By providing a hydrogen concentration detection unit, it is beneficial to monitor the hydrogen concentration in real time and avoid safety accidents caused by too high hydrogen concentration in the tail exhaust. The cooperative setting of the fifth interface pipeline and the sixth interface pipeline can combine with other interface pipelines to reduce the number of components, thereby reducing costs, saving space, further improving the integration degree and being beneficial for lightweighting.

[0020] Another object of the present utility model is to provide a fuel cell system, in which the above-mentioned fuel cell exhaust system is provided.

[0021] In the fuel cell system described in the present utility model, the above-mentioned fuel cell exhaust system is provided, which can reduce the risk of hydrogen backflow and avoid cracking of the stack housing, thereby improving the safety of the fuel cell. Description of the Drawings

[0022] The attached drawings, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the attached drawings:

[0023] Figure 1 is a schematic diagram of the overall structure of the fuel cell exhaust system according to the embodiment of the present utility model;

[0024] Figure 2 、 Figure 3 and Figure 5 are schematic diagrams of the structure from other perspectives of the structure shown in Figure 1 ;

[0025] Figure 4 is a sectional view taken along the A-A direction in Figure 3 ;

[0026] Figure 6 is a sectional view taken along the B-B direction in Figure 5 ;

[0027] Description of reference numerals:

[0028] 11. Tail exhaust pipeline; 111. First convex part; 1111. First flow channel; 1112. Second flow channel; 112. Second convex part; 1121. Third flow channel; 113. Mounting seat; 114. Wiring harness fixing plate; 115. Air valve connection flange; 116. Wiring harness fixing convexity;

[0029] 12. First interface pipeline; 13. First detection mounting part; 14. Second interface pipeline; 15. Third interface pipeline; 16. Fourth interface pipeline; 17. Fifth interface pipeline; 18. Sixth interface pipeline; 19. Second detection mounting part. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0031] In the following description, specific details such as specific system structures and technologies are proposed for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0032] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and should not be construed as indicating or implying relative importance.

[0033] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0034] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0035] Embodiment 1

[0036] This embodiment relates to a fuel cell exhaust system, which can achieve better pressure control of the purge gas to avoid problems such as hydrogen backflow into the stack due to too small gas pressure or cracking of the stack housing due to too large gas pressure, thereby facilitating the improvement of the safety of the fuel cell system.

[0037] In terms of the overall structure, as Figures 1 to 6 shown, the fuel cell exhaust system of this embodiment includes an exhaust pipe 11, a first interface pipe 12 provided on the exhaust pipe 11, and a pressure detection unit provided on the first interface pipe 12. Moreover, a first flow channel 1111 is provided in the exhaust pipe 11. The inlet of the first interface pipe 12 is connected to the stack purge pipe of the fuel cell, the outlet of the first interface pipe 12 is connected to the first flow channel 1111, and the outlet of the first flow channel 1111 is arranged close to the outlet of the exhaust pipe 11.

[0038] At this time, with the above settings, by setting the first interface pipeline 12 connected to the stack purge pipeline, and arranging a first flow channel 1111 connected to the first interface pipeline 12 in the tail exhaust pipeline 11, and the outlet of the first flow channel 1111 being arranged close to the outlet of the tail exhaust pipeline 11, it is possible to separate the stack purge gas from the other gas flows for discharge, thereby reducing the risk of hydrogen backflow into the stack. At the same time, the setting of the pressure detection unit can monitor the pressure of the stack purge gas. It can not only cooperate with the first flow channel 1111 to reduce the risk of hydrogen backflow caused by too low pressure, but also avoid cracking of the stack housing due to excessive purge pressure, thus facilitating the improvement of the safety of the fuel cell.

[0039] It should be noted that the direction-related expressions in this embodiment are only exemplary descriptions of this embodiment. In specific implementation, the direction expressions in this embodiment vary with the setting direction of the tail exhaust pipeline, that is, the directions in this embodiment refer to a relative coordinate system based on the tail exhaust pipeline. For example, in Figure 1 the state shown, the inlet of the tail exhaust pipeline 11 is located at the left end of itself, and the outlet of the tail exhaust pipeline 11 is located at the right end of itself.

[0040] Based on the above overall introduction, in detail, in this embodiment, the pressure detection unit can preferably adopt a pressure sensor well-known to those skilled in the art. And in specific implementation, a first detection and installation part 13 integrated with the first interface pipeline 12 can preferably be provided on the tail exhaust pipeline 11. The specific structural form of the first detection and installation part 13 can be set and adjusted according to the actual layout and installation requirements of the pressure detection unit. For example, it is provided with a communication hole communicating with the first interface pipeline 12, etc.

[0041] Furthermore, as a preferred implementation form, the fuel cell exhaust system of this embodiment further includes a controller and an air compressor. When specifically setting, both the pressure detection unit and the air compressor are connected to the controller, and the output end of the air compressor is connected to the stack purge pipeline. Then, after the controller receives the pressure signal sent by the pressure detection unit, it can directly control the output pressure of the air compressor through the controller, thereby realizing the monitoring and adjustment of the pressure of the stack purge gas, and further achieving the purpose of avoiding hydrogen backflow or cracking of the stack housing.

[0042] Meanwhile, in addition to the above-described method of directly controlling the air compressor by the controller to adjust the purge pressure of the fuel cell stack, in this embodiment, as another preferred implementation form, on the basis of providing a controller and an air compressor, a regulating valve for controlling the gas flow rate may also be provided on the fuel cell stack purge pipeline. At this time, both the pressure detection unit and the regulating valve are connected to the controller, and the output end of the air compressor is connected to the fuel cell stack purge pipeline. Thus, after the controller receives the pressure signal sent by the pressure detection unit, the controller can control the opening degree of the regulating valve (at this time, it can be default that the output pressure of the air compressor is greater than the pressure bearing value of the fuel cell stack housing) to monitor and adjust the purge gas pressure of the fuel cell stack, thereby achieving the above-mentioned purpose of avoiding hydrogen backflow or cracking of the fuel cell stack housing.

[0043] Of course, in order to control the purge pressure of the fuel cell stack to avoid hydrogen backflow or cracking of the fuel cell stack housing, those skilled in the art can adopt other common technical means to control the purge pressure of the fuel cell stack based on the information feedback of the pressure detection unit, not limited to the above two control methods. And the above-mentioned regulating valve can specifically adopt a flow control valve or a solenoid valve, and the above-mentioned controller can specifically be a control device commonly known to those skilled in the art such as an HCU (Hybrid Vehicle Controller) or an ECU (Electronic Control Unit) to save design and manufacturing costs. Secondly, for the related structural parts not mentioned in the fuel cell exhaust system of this embodiment, they can all refer to the structures in the fuel cell system well-known to those skilled in the art, and will not be elaborated here.

[0044] Furthermore, in this embodiment, as a preferred implementation form, in combination with Figure 3 and Figure 4 As shown, a first convex portion 111 protruding into the tail exhaust pipeline 11 is provided on the inner wall of the tail exhaust pipeline 11, and a first flow channel 1111 is provided in the first convex portion 111. The main advantage of such a setting is that it is beneficial to the layout of the first flow channel 1111, and to separate and discharge the fuel cell stack purge gas from other discharged gases in the tail exhaust pipeline 11.

[0045] See Figure 1 and Figure 2 As shown, in this embodiment, as a preferred implementation form, a second interface pipeline 14 is provided on the tail exhaust pipeline 11, and the inlet of the second interface pipeline 14 is connected to the pressure relief pipeline of the fuel cell. At the same time, a second flow channel 1112 is provided in the first convex portion 111, the outlet of the second interface pipeline 14 is connected to the second flow channel 1112, and the outlet of the second flow channel 1112 is arranged close to the outlet of the tail exhaust pipeline 11.

[0046] It can be understood that by cooperatively arranging the second interface pipeline 14 and the second flow channel 1112 integrated on the first convex portion 111, not only can the gas discharged from the pressure relief pipeline be separated from and discharged together with other discharged gases, but also it is beneficial to improve the overall integration degree of the device. Moreover, the outlet of the second flow channel 1112 is arranged close to the outlet of the tail exhaust pipeline 11, which is beneficial to reducing the risk of hydrogen backflow.

[0047] Furthermore, as a further improved form, in this embodiment, the second interface pipeline 14 is located between the outlets of the first interface pipeline 12 and the tail exhaust pipeline 11, which is beneficial to improving the layout rationality of the tail exhaust pipeline 11 and each interface pipeline, saving space occupation while avoiding cross - over between the first flow channel 1111 and the second flow channel 1112.

[0048] In addition, in this embodiment, as a preferred implementation form, in combination with Figure 1 , Figure 3 , Figure 5 and Figure 6 as shown, a third interface pipeline 15 is provided on the tail exhaust pipeline 11, and the inlet of the third interface pipeline 15 is connected to the drainage pipeline of the fuel cell. At the same time, a third flow channel 1121 is provided in the tail exhaust pipeline 11, the outlet of the third interface pipeline 15 is connected to the third flow channel 1121, and the outlet of the third flow channel 1121 is arranged close to the outlet of the tail exhaust pipeline 11.

[0049] Also, as a preferred implementation form, in this embodiment, a fourth interface pipeline 16 is provided on the tail exhaust pipeline 11, the inlet of the fourth interface pipeline 16 is connected to the nitrogen discharge pipeline of the fuel cell, and the outlet of the fourth interface pipeline 16 is connected to the third flow channel 1121.

[0050] The main advantage of such an arrangement is that through the cooperative arrangement of the third interface pipeline 15, the fourth interface pipeline 16 and the third flow channel 1121, while improving the integration degree of the fuel cell exhaust system, it can achieve separation and discharge from other discharged gases and avoid the occurrence of hydrogen backflow.

[0051] Moreover, in this embodiment, also as a preferred implementation form, a second convex portion 112 protruding into the tail exhaust pipeline 11 is provided on the inner wall of the tail exhaust pipeline 11, and the third flow channel 1121 is arranged in the second convex portion 112. Thus, it is beneficial to the layout and design of the third flow channel 1121 and to separate and discharge the hydrogen in the drainage pipeline and the nitrogen discharge pipeline from other discharged gases.

[0052] At this time, to further reduce the risk of hydrogen backflow, in this embodiment, as a preferred implementation form, a hydrogen concentration detection unit is provided on the tail exhaust pipeline 11, and the hydrogen concentration detection unit is arranged close to the exhaust port of the tail exhaust pipeline 11. It can be understood that by setting the hydrogen concentration detection unit, it is conducive to real-time monitoring of the hydrogen concentration and avoiding safety accidents caused by too high hydrogen concentration in the tail exhaust.

[0053] During specific implementation, for the convenience of assembling the hydrogen concentration detection unit, in this embodiment, a second detection and installation member 19 for arranging and installing the hydrogen concentration detection unit may also be provided on the tail exhaust pipeline 11. The specific structural form of the second detection and installation member 19 can be set and adjusted according to the actual installation requirements of the hydrogen concentration detection unit. For example, an installation through hole communicating with the inside of the tail exhaust pipeline 11 is provided on the second detection and installation member 19.

[0054] In this embodiment, as a preferred implementation form, an air valve is provided at the inlet of the tail exhaust pipeline 11 to facilitate the control of the on-off between the tail exhaust pipeline 11 and the air module. During specific implementation, as Figure 1 shown, an air valve connection flange 115 for connecting with the air valve is further provided at the left end of the tail exhaust pipeline 11 in this embodiment.

[0055] As Figure 1 and Figure 2 shown, in this embodiment, as a preferred implementation form, a fifth interface pipeline 17 is provided on the tail exhaust pipeline 11. The inlet of the fifth interface pipeline 17 is connected to the outlet of the intercooler of the fuel cell, and the outlet of the fifth interface pipeline 17 is connected to the inside of the tail exhaust pipeline 11. At the same time, as a preferred implementation form, a sixth interface pipeline 18 is provided on the tail exhaust pipeline 11. The inlet of the sixth interface pipeline 18 is connected to the purge outlet of the air compressor of the fuel cell, and the outlet of the sixth interface pipeline 18 is connected to the inside of the tail exhaust pipeline 11.

[0056] Here, through the combined setting of the fifth interface pipeline 17 and the sixth interface pipeline 18, other interface pipelines can be combined to reduce the number of components, thereby reducing costs, saving space, improving the integration degree, and being beneficial to lightweight design.

[0057] In addition, still as Figure 1 and Figure 2 shown, in this embodiment, as a preferred implementation form, an installation part is provided on the tail exhaust pipeline 11, and the installation part fixes the tail exhaust pipeline 11 in the fuel cell system to facilitate the layout and installation of the fuel cell exhaust system in the fuel cell system.

[0058] In specific implementation, the installation part of this embodiment includes an installation seat 113 provided on the tail exhaust pipeline 11. The installation seat 113 includes a mounting plate for fixedly installing in the fuel cell system, and a support plate provided between the tail exhaust pipeline 11 and the mounting plate. When necessary, reinforcing ribs and the like can also be provided between the mounting plate, the support plate and the tail exhaust pipeline 11.

[0059] Furthermore, as a preferred implementation form, a wire harness fixing part for fixing the wire harness is provided on the tail exhaust pipeline 11 of this embodiment, which is conducive to the arrangement and storage of the wire harness in the fuel cell system. In specific implementation, the wire harness is provided with fixing feet with threads. The wire harness fixing part includes a wire harness fixing plate 114 and a wire harness fixing protrusion 116 provided on the tail exhaust pipeline 11, and threaded holes for threaded cooperation with the fixing feet are provided on both the wire harness fixing plate 114 and the wire harness fixing protrusion 116. Thus, the wire harness can be arranged and fixed by screwing the fixing feet into the threaded holes.

[0060] In the fuel cell exhaust system of this embodiment, by providing a first interface pipeline 12 connected to the stack purge pipeline, and providing a first flow channel 1111 connected to the first interface pipeline 12 in the tail exhaust pipeline 11, and the outlet of the first flow channel 1111 is arranged close to the outlet of the tail exhaust pipeline 11, it is possible to separate the stack purge gas from the other gas flows for discharge, so as to reduce the risk of hydrogen backflow into the stack. At the same time, the setting of the pressure detection unit can monitor the pressure of the stack purge gas, which can not only cooperate with the first flow channel 1111 to reduce the risk of hydrogen backflow caused by too low pressure, but also avoid the cracking of the stack housing caused by too high purge pressure. Thus, it is beneficial to improve the safety of the fuel cell.

[0061] At the same time, in this embodiment, by integrating each interface pipeline on the tail exhaust pipeline 11, the number of components can be reduced, so as to reduce costs and save space, and then improve the integration degree of the tail exhaust pipeline and be beneficial to lightweight. Secondly, the settings of the first flow channel 1111, the second flow channel 1112 and the third flow channel 1121 are not only conducive to preventing hydrogen from backflowing into the stack, but also can reduce the hydrogen backflow into the tail exhaust pipeline 11, thus being beneficial to improving the safety quality of the fuel cell.

[0062] Embodiment 2

[0063] This embodiment relates to a fuel cell system, in which the fuel cell exhaust system in Embodiment 1 is provided.

[0064] In the fuel cell system of this embodiment, by providing the fuel cell exhaust system in Embodiment 1, it is not only beneficial to reduce the safety risk caused by hydrogen backflow, but also can reduce the number of system components and improve the overall integration degree of the system. Thus, it can have better product quality and competitiveness.

[0065] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A fuel cell exhaust system, characterized in that: It includes an exhaust pipe (11), a first interface pipe (12) provided on the exhaust pipe (11), and a pressure detection unit provided on the first interface pipe (12); A first flow channel (1111) is provided in the exhaust pipe (11). The inlet of the first interface pipe (12) is connected to the stack purge pipe of the fuel cell, the outlet of the first interface pipe (12) is connected to the first flow channel (1111), and the outlet of the first flow channel (1111) is arranged close to the outlet of the exhaust pipe (11).

2. The fuel cell exhaust system according to claim 1, characterized in that: A first convex part (111) protruding into the exhaust pipe (11) is provided on the inner wall of the exhaust pipe (11), and the first flow channel (1111) is arranged in the first convex part (111).

3. The fuel cell exhaust system according to claim 2, characterized in that: A second interface pipe (14) is provided on the exhaust pipe (11), and the inlet of the second interface pipe (14) is connected to the pressure relief pipe of the fuel cell; A second flow channel (1112) is provided in the first convex part (111). The outlet of the second interface pipe (14) is connected to the second flow channel (1112), and the outlet of the second flow channel (1112) is arranged close to the outlet of the exhaust pipe (11), and / or the second interface pipe (14) is located between the first interface pipe (12) and the outlet of the exhaust pipe (11).

4. The fuel cell exhaust system according to claim 1, characterized in that: It further includes a controller and an air compressor; Both the pressure detection unit and the air compressor are connected to the controller. The output end of the air compressor is connected to the stack purge pipe, or a regulating valve for controlling the gas flow is provided on the stack purge pipe. Both the pressure detection unit and the regulating valve are connected to the controller, and the output end of the air compressor is connected to the stack purge pipe.

5. The fuel cell exhaust system according to claim 1, characterized in that: A third interface pipe (15) is provided on the exhaust pipe (11), and the inlet of the third interface pipe (15) is connected to the drainage pipe of the fuel cell; A third flow channel (1121) is provided in the exhaust pipe (11). The outlet of the third interface pipe (15) is connected to the third flow channel (1121), and the outlet of the third flow channel (1121) is arranged close to the outlet of the exhaust pipe (11).

6. The fuel cell exhaust system according to claim 5, characterized in that: A fourth interface pipe (16) is provided on the exhaust pipe (11). The inlet of the fourth interface pipe (16) is connected to the nitrogen discharge pipe of the fuel cell, and the outlet of the fourth interface pipe (16) is connected to the third flow channel (1121); and / or A second convex portion (112) protruding into the exhaust pipe (11) is provided on the inner wall of the exhaust pipe (11), and the third flow channel (1121) is arranged in the second convex portion (112).

7. The fuel cell exhaust system according to claim 1, characterized in that: A hydrogen concentration detection unit is provided on the exhaust pipe (11), and the hydrogen concentration detection unit is arranged near the exhaust port of the exhaust pipe (11); and / or, An air valve is provided at the inlet of the exhaust pipe (11).

8. The fuel cell exhaust system according to claim 1, characterized in that: A fifth interface pipe (17) is provided on the exhaust pipe (11), the inlet of the fifth interface pipe (17) is connected to the outlet of the intercooler of the fuel cell, and the outlet of the fifth interface pipe (17) is connected to the inside of the exhaust pipe (11); and / or, A sixth interface pipe (18) is provided on the exhaust pipe (11), the inlet of the sixth interface pipe (18) is connected to the purge outlet of the air compressor of the fuel cell, and the outlet of the sixth interface pipe (18) is connected to the inside of the exhaust pipe (11).

9. The fuel cell exhaust system according to any one of claims 1 to 8, characterized in that: An installation portion is provided on the exhaust pipe (11), and the installation portion fixes the exhaust pipe (11) in the fuel cell; and / or, A wire harness fixing portion for fixing the wire harness is provided on the exhaust pipe (11).

10. A fuel cell system, characterized in that: The fuel cell exhaust system according to any one of claims 1 to 9 is provided in the fuel cell system.

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