JP2019217895A - Fuel cell vehicle - Google Patents

Abstract

To provide a fuel cell vehicle which can prevent water from accumulating in an exhaust pipe even during low load operation, such as idle operation, and when a vehicle inclines.SOLUTION: A fuel cell vehicle 10 includes a fuel cell system 12 and an exhaust structure 14. The exhaust structure 14 includes: a main exhaust pipe 64 having crossing parts 68, each of which is provided crossing from one side to the other side as seen in a horizontal direction above a vehicle structure member; and draining bypass pipes 66, each of which is provided below the vehicle body structure member, branches from the main exhaust pipe 64 at a position located closer to the one side as seen in the horizontal direction than the vehicle body structure member, connects with the main exhaust pipe 64 at a position located closer to the other side as seen in the horizontal direction than the vehicle body structure member, and is formed thinner than the main exhaust pipe 64.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fuel cell vehicle.

  For example, Patent Literature 1 below discloses a fuel cell vehicle on which a fuel cell stack is mounted. An exhaust pipe is connected to the cathode outlet side of the fuel cell stack, and cathode exhaust gas including air is discharged to the outside of the vehicle via the exhaust pipe. Typically, the fuel cell stack is mounted at the front of the vehicle, the exhaust pipe is arranged along the floor of the vehicle and extends to the rear of the vehicle, and the cathode exhaust is discharged from the rear of the vehicle to the outside of the vehicle . Cathode exhaust gas contains water that is a reaction product of the fuel cell.

JP 2010-269760 A

  If there is a difference in elevation (up and down) in the exhaust pipe in the middle section up to the outlet of the exhaust pipe, water cannot be discharged during low-load operation such as idle operation, and water may accumulate in the exhaust pipe. . Further, when the vehicle is inclined, water may accumulate in the exhaust pipe. If water accumulates in the exhaust pipe, problems such as increased pressure loss, generation of abnormal noise, and freezing of the pipe in a low-temperature environment after the system is stopped may occur.

  The present invention has been made in consideration of such a problem, and a fuel cell that can prevent water from accumulating in an exhaust pipe even during low load operation such as idling operation or when a vehicle is tilted. It is intended to provide a vehicle.

  A first aspect of the present invention is a fuel cell vehicle comprising: a fuel cell system; and an exhaust structure for discharging cathode exhaust gas flowing out of the fuel cell system to the outside of the vehicle. A main exhaust pipe having a bridging portion provided so as to straddle the structural member from one side in the horizontal direction to the other side, and a main exhaust pipe provided below the vehicle body structural member; A water drain bypass pipe branched from the main exhaust pipe at a position, connected to the main exhaust pipe at a position on the other side in the horizontal direction from the vehicle body structural member, and configured to be thinner than the main exhaust pipe. A fuel cell vehicle.

  A second aspect of the present invention is a fuel cell vehicle including a fuel cell system, and an exhaust structure for discharging cathode exhaust gas flowing out of the fuel cell system to the outside of the vehicle, wherein the fuel cell system includes: A fuel cell stack, an oxidant gas supply line connected to the fuel cell stack, an oxidant gas discharge line connected to the fuel cell stack, a compressor provided in the oxidant gas supply line, and the oxidant A pump having an expander provided in a gas discharge line, and the exhaust structure has a water separator connected to an outlet of the expander, and an exhaust pipe connected to the water separator, The water separator is provided with a drain port with an opening / closing mechanism below a connection portion between the exhaust pipe and the water separator. It is a vehicle.

  According to the first aspect of the present invention, since the drainage bypass pipe configured to be thinner than the main exhaust pipe is disposed below the vehicle body structural member, water passes through the drainage bypass pipe. It can flow downstream. Therefore, it is possible to prevent water from accumulating in the main exhaust pipe having a height difference to get over the vehicle body structural member. This can prevent water from accumulating in the exhaust structure even during low-load operation such as during idling or when the vehicle is tilted.

  According to the second aspect of the present invention, since water can be removed (recovered) immediately after the expander, even if there is a difference in elevation in the exhaust pipe in order to get over the vehicle body structural member, the water is retained in the exhaust pipe. Accumulation can be prevented. Further, even when the air pump with the regenerative mechanism is disposed at a relatively low position (for example, at a position lower than the fuel cell stack), the water can be effectively discharged outside the vehicle through the drain port.

1 is a schematic view of a fuel cell vehicle according to one embodiment of the present invention. It is a schematic diagram of a fuel cell system and an exhaust structure. FIG. 3 is a configuration explanatory view of an exhaust structure. FIG. 9 is a configuration explanatory view of an exhaust structure according to another aspect. It is explanatory drawing of the valve opening pressure of a one-way valve.

  Hereinafter, a preferred embodiment of a fuel cell vehicle according to the present invention will be described with reference to the accompanying drawings.

  The fuel cell vehicle 10 according to the present embodiment shown in FIG. An exhaust structure 14 for discharging the gas to the outside of the vehicle. The fuel cell stack 20 is arranged in a motor room 16 (below the hood 18) provided at the front of the vehicle. Although not shown, the fuel cell vehicle 10 further includes electric components such as a running motor and an ECU (Electronic control unit) that operate using electric power generated by the fuel cell system 12 as a power supply.

  As shown in FIG. 2, the fuel cell system 12 further supplies a fuel gas supply device 24 that supplies a fuel gas (for example, hydrogen gas) to the fuel cell stack 20 and air that is an oxidant gas to the fuel cell stack 20. An oxidizing gas supply device 26 is provided. Although not shown, the fuel cell system 12 further includes a battery that is an energy storage device, and a cooling medium supply device that supplies a cooling medium to the fuel cell stack 20.

  The fuel cell stack 20 includes a plurality of power generation cells stacked in, for example, a horizontal direction (or a vertical direction). The power generation cell has an electrolyte membrane / electrode structure in which an anode electrode and a cathode electrode are respectively arranged on both sides of an electrolyte membrane (for example, a solid polymer electrolyte membrane), and sandwiches the electrolyte membrane / electrode structure from both sides. And a pair of separators. A fuel gas flow path is formed between the anode electrode and one of the separators. An oxidant gas flow path is formed between the cathode electrode and the other separator. One end of a drain tube 21a for discharging water from the cathode is connected to the fuel cell stack 20. The other end of the drain pipe 21a is connected to a later-described exhaust pipe 60 of the exhaust structure 14.

  The fuel gas supply device 24 includes a fuel gas tank 28 that stores a high-pressure fuel gas (high-pressure hydrogen), a fuel gas supply line 30 that guides the fuel gas to the fuel cell stack 20, and an injector provided in the fuel gas supply line 30. 32 and an ejector 34 provided downstream of the injector 32. The fuel gas supply line 30 is connected to a fuel gas inlet 20a of the fuel cell stack 20. The injector 32 and the ejector 34 constitute a fuel gas injection device.

  A fuel gas discharge line 36 is connected to the fuel gas outlet 20b of the fuel cell stack 20. The fuel gas discharge line 36 derives, from the fuel cell stack 20, an anode exhaust gas (fuel off-gas), which is a fuel gas at least partially used at the anode of the fuel cell stack 20. A gas-liquid separator 38 is provided in the fuel gas discharge line 36. A circulation line 40 is connected to the fuel gas discharge line 36. The circulation line 40 guides the anode exhaust gas to the ejector 34. A circulation pump 42 is provided in the circulation line 40. Note that the circulation pump 42 may not be provided.

  The oxidizing gas supply device 26 includes an oxidizing gas supply line 44 connected to the oxidizing gas inlet 20 c of the fuel cell stack 20 and an oxidizing gas discharge line 46 connected to the oxidizing gas outlet 20 d of the fuel cell stack 20. And an air pump 48 for supplying air to the fuel cell stack 20 and a humidifier 50 for humidifying the air supplied to the fuel cell stack 20.

  The air pump 48 has a compressor 48a for compressing air, a motor 48b for rotating and driving the compressor 48a, and an expander 48c (regeneration mechanism) connected to the compressor 48a. The compressor 48 a is provided in the oxidizing gas supply line 44. In the oxidizing gas supply line 44, an air cleaner 52 is provided upstream of the compressor 48a. The air is introduced into the compressor 48a via the air cleaner 52. The expander 48c is provided in the oxidant gas discharge line 46.

  The impeller of the expander 48c is connected to the impeller of the compressor 48a via a connecting shaft 48d. Cathode exhaust gas is introduced into the impeller of the expander 48c, and fluid energy is regenerated from the cathode exhaust gas. The regenerative energy covers a part of the driving force for rotating the compressor 48a.

  The humidifier 50 has a large number of hollow fiber membranes through which moisture can pass, and the hollow fiber membrane causes moisture to flow between the air flowing toward the fuel cell stack 20 and the humid cathode exhaust gas discharged from the fuel cell stack 20. The replacement is performed to humidify the air toward the fuel cell stack 20.

  In the oxidizing gas supply line 44, a gas-liquid separator 54 is provided between the humidifier 50 and the oxidizing gas inlet 20c of the fuel cell stack 20. One end of the drain pipe 21b is connected to the gas-liquid separator 54. The other end of the drain pipe 21b is connected to the exhaust pipe 60 of the exhaust structure 14.

  The exhaust structure 14 is connected to an oxidizing gas exhaust line 46. Specifically, the exhaust structure 14 has an exhaust pipe 60, and the exhaust pipe 60 is connected to the outlet 48e of the expander 48c. The exhaust pipe 60 is provided with a silencer 62.

  As shown in FIG. 1, the air pump 48 is arranged at a lower portion of the front part of the vehicle body (below the fuel cell stack 20). The exhaust pipe 60 extends from the outlet 48e of the expander 48c, and extends along the bottom of the vehicle to the rear of the vehicle. Therefore, the outlet 61 of the exhaust pipe 60 is located at the rear part of the vehicle body. The vehicle body of the fuel cell vehicle 10 includes vehicle body structural members such as a drive shaft 10a and a subframe 10b, and an exhaust pipe 60 extending from the front of the vehicle body to the rear of the vehicle body is provided with these vehicle structural members. It has a shape that avoids interference.

  In FIG. 3, the exhaust pipe 60 has a main exhaust pipe 64 that constitutes the entire length of the exhaust pipe 60, and a drainage bypass pipe 66 connected to the main exhaust pipe 64. The main exhaust pipe 64 has at least one straddling portion 68 provided above the vehicle body structural member from one side (vehicle front side) in the horizontal direction to the other side (vehicle rear side). In the present embodiment, a plurality (two) of the straddling portions 68 are provided. Hereinafter, when the straddling portions 68 are separately described, they are referred to as “first straddling portions 68a” and “second straddling portions 68b”, respectively.

  Due to the relationship between the peripheral structure of the drive shaft 10a and the sub-frame 10b and the outer diameter of the main exhaust pipe 64, it is difficult to arrange the main exhaust pipe 64 below the drive shaft 10a and the sub-frame 10b. Therefore, the first straddling portion 68a is configured to straddle the drive shaft 10a, and the second straddling portion 68b is configured to straddle the sub-frame 10b. The first bridging portion 68a is provided on the vehicle front side with respect to the second bridging portion 68b.

  The first straddling portion 68a is an upwardly inclined portion 70 extending upward toward the downstream, a downwardly inclined portion 71 extending downwardly toward the downstream, and horizontally connects the upwardly inclined portion 70 and the downwardly inclined portion 71. And a top (top) 72. The second straddling portion 68b has an upward inclined portion 74 extending upward toward the downstream and a downward inclined portion 75 extending downward toward the downstream. The second straddling portion 68b may further have a top (uppermost portion) that horizontally connects the upwardly inclined portion 74 and the downwardly inclined portion 75, similarly to the first stepped portion 68a.

  The first bridging portion 68a and the second bridging portion 68b are connected by an intermediate extending portion 76 (a part of the main exhaust pipe 64). In the present embodiment, the intermediate extending portion 76 extends horizontally between the first bridging portion 68a and the second bridging portion 68b without a difference in height (no up / down). The intermediate extension portion 76 may be slightly inclined downward toward the rear of the vehicle (toward the second straddling portion 68b).

  A rear exhaust pipe 69 (a part of the main exhaust pipe 64) is connected to a downstream end (a lower end of the downward inclined portion 75) of the second straddling portion 68b. The rear end of the rear exhaust pipe 69 is the outlet 61 of the exhaust pipe 60. The rear exhaust pipe 69 has no upward slope. That is, the rear exhaust pipe 69 includes only a horizontal portion and a downward inclined portion, or only a horizontal portion.

  The drainage bypass pipe 66 is provided below the vehicle body structural member, branches off from the main exhaust pipe 64 at a position on one side in the horizontal direction (front side of the vehicle) with respect to the vehicle body structural member, and is located on the other side in the horizontal direction from the vehicle body structural member Side (rear side of the vehicle) is connected to the main exhaust pipe 64. The drainage bypass pipe 66 is configured to be thinner (smaller in diameter) than the main exhaust pipe 64, and is connected to the main exhaust pipe 64 so as to bypass the straddle section 68. In the present embodiment, a plurality (two) of drainage bypass pipes 66 are provided. Hereinafter, when the drainage bypass pipes 66 are separately described, they are referred to as a “first drainage bypass pipe 66a” and a “second drainage bypass pipe 66b”, respectively.

  The first drainage bypass pipe 66a is arranged below the drive shaft 10a, which is one of the vehicle body structural members. Since the first drain bypass pipe 66a is relatively thin, it can be disposed below the drive shaft 10a. One end (front end) of the first drainage bypass pipe 66a is connected to the lower end of the upwardly inclined portion 70 of the first bridging portion 68a. The other end (rear end) of the first drainage bypass pipe 66a is connected to the lower end of the downward inclined portion 71 of the first bridging portion 68a.

  The first drain bypass pipe 66a has no upward slope. In other words, the first drainage bypass pipe 66a is composed of only the horizontal portion and the downwardly inclined portion, or only the horizontal portion (the first drainage bypass pipe 66a in the illustrated example has the former configuration). ). In addition, the first drainage bypass pipe 66a may be configured only with the downward slope.

  The second drainage bypass pipe 66b is disposed below a subframe 10b, which is one of the vehicle body structural members. Since the second drain bypass pipe 66b is relatively thin, it can be disposed below the sub-frame 10b. One end (front end) of the second drainage bypass pipe 66b is connected to the lower end of the upwardly inclined portion 74 of the second straddling portion 68b. The other end (rear end) of the second drainage bypass pipe 66b is connected to the lower end of the downward slope 75 of the second straddle 68b.

  The second drain bypass pipe 66b has no upward slope. That is, the second drainage bypass pipe 66b includes only the horizontal portion and the downwardly inclined portion, or includes only the horizontal portion (the second drainage bypass pipe 66b in the illustrated example has the latter configuration). ). In addition, the second drainage bypass pipe 66b may be constituted only by the downward slope.

  The drain pipes 21a and 21b are connected to the main exhaust pipe 64. The drain pipes 21a and 21b are connected to the main exhaust pipe 64 downstream of the upper end of the first bridging section 68a. Specifically, the drain tube 21b is connected to the downward inclined portion 71 of the first bridging portion 68a. The drain tube 21b may be connected to the top 72 or the intermediate extension 76 of the first straddle 68a. The drain tube 21a is connected to the intermediate extension 76. The drain tube 21a may be connected to the top 72 or the downward slope 71. All the drain tubes 21a, 21b may be connected to the top 72 of the first straddle 68a. All the drain tubes 21a and 21b may be connected to the downwardly inclined portion 71 of the first bridging portion 68a. All drain tubes 21a and 21b may be connected to the intermediate extension 76.

  Next, the operation of the fuel cell vehicle 10 configured as described above (mainly the operation of the fuel cell system 12 and the exhaust structure 14) will be described.

  2, in the fuel gas supply device 24, the fuel gas is supplied from the fuel gas tank 28 to the fuel gas supply line 30. At this time, the fuel gas is injected by the injector 32 toward the ejector 34, introduced into the fuel gas flow path in the fuel cell stack 20 from the fuel gas inlet 20a via the ejector 34, and supplied to the anode.

  On the other hand, in the oxidizing gas supply device 26, air as an oxidizing gas is sent to the oxidizing gas supply line 44 under the rotation of an air pump 48 (compressor 48 a). After the air is humidified by the humidifier 50, the air is introduced from the oxidizing gas inlet 20c into the oxidizing gas flow path in the fuel cell stack 20, and supplied to the cathode. In each power generation cell, fuel gas supplied to the anode and oxygen in the air supplied to the cathode are consumed by an electrochemical reaction in the electrode catalyst layer to generate power.

  Fuel gas not consumed by the anode is discharged from the fuel gas outlet 20b to the fuel gas discharge line 36 as anode exhaust gas. The anode exhaust gas is introduced from the fuel gas discharge line 36 to the ejector 34 via the circulation line 40. The anode exhaust gas introduced into the ejector 34 is mixed with the fuel gas injected by the injector 32 and supplied to the fuel cell stack 20.

  From the oxidant gas outlet 20d of the fuel cell stack 20, humid exhaust gas containing oxygen not consumed at the cathode and water as a reaction product at the cathode are discharged to the oxidant gas discharge line 46. You. The cathode exhaust gas is introduced into the expander 48 c of the air pump 48 after the humidifier 50 exchanges moisture with the air flowing toward the fuel cell stack 20. In the expander 48c, energy is recovered (regenerated) from the cathode exhaust gas, and the regenerated energy becomes a part of the driving force of the compressor 48a. The cathode exhaust gas and water are discharged from the expander 48c to the exhaust structure 14 (exhaust pipe 60), and are discharged through the exhaust pipe 60 to the outside of the vehicle. In this case, the cathode exhaust gas reaches the outlet 61 of the exhaust pipe 60 via the bridging section 68 of the main exhaust pipe 64. On the other hand, water reaches the outlet 61 of the exhaust pipe 60 via the drain bypass pipe 66.

  In this case, the fuel cell vehicle 10 has the following effects.

  According to the fuel cell vehicle 10, as shown in FIG. 3, the drainage bypass pipe 66 configured to be thinner than the main exhaust pipe 64 is disposed below the vehicle body structural member. The water can flow downstream through the drain bypass pipe 66. Therefore, it is possible to prevent water from collecting in the main exhaust pipe 64 having a height difference in order to get over the vehicle body structural member. Thus, even when the fuel cell vehicle 10 is inclined during low load operation such as during idling operation or the like, the water can be prevented from being accumulated in the exhaust structure 14.

  In this fuel cell vehicle 10, a plurality of straddling portions 68 and a plurality of drainage bypass pipes 66 are provided. With this configuration, even in a structure in which the main exhaust pipe 64 must climb over the vehicle body structural member at a plurality of locations, it is possible to discharge water to the outside of the vehicle through the plurality of drainage bypass pipes 66 and prevent accumulation of water. it can.

  In FIG. 3, when the drain pipe 21 a or the drain pipe 21 b is connected to the uppermost part (top part 72) or the downward inclined part 71 of the bridging part 68 in the main exhaust pipe 64, the main exhaust from the drain pipe 21 a or the drain pipe 21 b is performed. Since the flow of the water flowing into the pipe 64 increases at the downward slope 71, the water can be effectively discharged to the outside of the vehicle.

  As shown in FIG. 2, the fuel cell system 12 includes a fuel cell stack 20, an oxidizing gas supply line 44 connected to the fuel cell stack 20, and an oxidizing gas discharge line 46 connected to the fuel cell stack 20. And an air pump 48 having a compressor 48a provided in the oxidizing gas supply line 44 and an expander 48c provided as a regenerative mechanism provided in the oxidizing gas discharge line 46. As shown in FIG. 3, the main exhaust pipe 64 is connected to the outlet 48e of the expander 48c. With this configuration, even when the air pump 48 with the regenerative mechanism is disposed at a relatively low position (for example, a position lower than the fuel cell stack 20), the water is effectively discharged to the outside of the vehicle through the drain bypass pipe 66. be able to.

  In the fuel cell vehicle 10 described above, an exhaust structure 80 according to another embodiment shown in FIG. The exhaust structure 80 has a water separator 82 connected to the outlet 48e of the expander 48c, and an exhaust pipe 84 connected to the water separator 82. The water separator 82 is provided with a drain port 82b with an opening / closing mechanism 86 below the connection between the exhaust pipe 84 and the water separator 82.

  The water separator 82 has a container 82a that can store water. The drain pipes 21a and 21b are connected to the upper part of the container 82a. The drain port 82b is provided below the container 82a of the water separator 82. The opening / closing mechanism 86 is a one-way valve 87 (a check valve) that opens against a spring force. The one-way valve 87 is configured to be closed below a predetermined valve opening pressure and open when the valve opening pressure is higher than the predetermined valve opening pressure. When the one-way valve 87 is closed, water is not drained from the drain port 82b (reserved in the container 82a of the water separator 82). When the one-way valve 87 is open, water is drained from the drain port 82b.

  As shown in FIG. 5, the one-way valve 87 has a valve opening pressure set such that the one-way valve 87 opens when the total pressure of the gas pressure (operating air pressure) and the water pressure in the water separator 82 becomes equal to or higher than a predetermined pressure. Have been. For example, when the total pressure of the gas pressure and the water pressure in the water separator 82 is lower than the valve opening pressure (pattern A), the one-way valve 87 remains closed. When the gas pressure (operating air pressure) in the water separator 82 is not so high, but the water pressure is high (when the amount of water in the container 82a is relatively large) (pattern B), the one-way valve 87 is opened. When the water pressure in the water separator 82 is relatively low but the gas pressure (operating air pressure) is relatively high (pattern C), the one-way valve 87 is also opened.

  4, one end of an exhaust pipe 84 is connected to a container 82a of a water separator 82. The connection position between the exhaust pipe 84 and the water separator 82 is set at a position higher than the highest water level in the container 82a. Therefore, the flow of water in the container 82a into the exhaust pipe 84 is prevented or suppressed. The exhaust pipe 84 has at least one straddling portion provided over a vehicle body structural member (drive shaft 10a, subframe 10b, etc.) from one side in the horizontal direction (vehicle front side) to the other side (vehicle rear side). 90. In the present embodiment, a plurality (two) of the straddling portions 90 are provided. That is, the exhaust pipe 84 has the first straddling portion 90a and the second straddling portion 90b.

  According to the fuel cell vehicle 10 provided with the exhaust structure 80, since water can be removed (recovered) immediately after the expander 48c, even if the exhaust pipe 84 has a height difference to get over the body structural member, Water can be prevented from accumulating in the exhaust pipe 84. Further, even when the air pump 48 with the regenerative mechanism is disposed at a relatively low position (for example, at a position lower than the fuel cell stack 20), water can be effectively discharged to the outside of the vehicle through the drain port 82b.

  The opening / closing mechanism 86 is a one-way valve 87 that opens against a spring force. With this configuration, when water accumulates to some extent in the water separator 82, drainage can be easily performed without performing state detection or control.

  The one-way valve 87 is set at a valve opening pressure such that it opens when the total pressure of the gas pressure and the water pressure in the water separator 82 becomes equal to or higher than a predetermined pressure. With this configuration, when a large amount of water accumulates in the water separator 82, the valve is opened even when the operating air pressure is low (pattern B in FIG. 5), so that the water can be drained from the drain port 82b. On the other hand, even if the water in the water separator 82 is small, the valve is opened when the operating air pressure rises (pattern C in FIG. 5), so that the water flowing from the high pressure (high output) fuel cell stack 20 is immediately discharged. can do.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Fuel cell vehicle 12 ... Fuel cell system 14, 80 ... Exhaust structure 48 ... Air pump 48c ... Expander 60 ... Main exhaust pipe 66 ... Drainage bypass pipe 68, 90 ... Crossover part 82 ... Water separator 82b ... Drainage port 86 … Opening and closing mechanism

Claims (8)

A fuel cell vehicle, comprising: a fuel cell system; and an exhaust structure for discharging cathode exhaust gas flowing out of the fuel cell system to the outside of the vehicle,
The exhaust structure,
A main exhaust pipe having a straddling portion provided to straddle the upper side of the vehicle body structural member from one side in the horizontal direction to the other side,
The main exhaust pipe is provided below the vehicle body structural member, branches off from the main exhaust pipe at a position on the one side in the horizontal direction from the vehicle body structural member, and the main exhaust pipe at a position on the other side in the horizontal direction from the vehicle body structural member Connected to the drain pipe, the drain pipe is configured to be thinner than the main exhaust pipe,
A fuel cell vehicle comprising: The fuel cell vehicle according to claim 1,
A fuel cell vehicle, wherein a plurality of the bridging portions and a plurality of the drainage bypass pipes are provided. The fuel cell vehicle according to claim 1 or 2,
The fuel cell system includes a fuel cell stack, an oxidizing gas discharge line connected to the fuel cell stack, a gas-liquid separator provided in the oxidizing gas discharge line, the gas-liquid separator, and the exhaust gas. And a drain tube connected to the structure. The fuel cell vehicle according to claim 3,
The fuel cell vehicle, wherein the drain pipe is connected to an uppermost portion or a downwardly inclined portion of the straddle portion in the main exhaust pipe. The fuel cell vehicle according to claim 1,
The fuel cell system is provided in a fuel cell stack, an oxidizing gas supply line connected to the fuel cell stack, an oxidizing gas discharge line connected to the fuel cell stack, and the oxidizing gas supply line. An air pump having a compressor and an expander as a regenerative mechanism provided in the oxidizing gas discharge line,
The fuel cell vehicle, wherein the main exhaust pipe is connected to an outlet of the expander. A fuel cell vehicle, comprising: a fuel cell system; and an exhaust structure for discharging cathode exhaust gas flowing out of the fuel cell system to the outside of the vehicle,
The fuel cell system is provided in a fuel cell stack, an oxidizing gas supply line connected to the fuel cell stack, an oxidizing gas discharge line connected to the fuel cell stack, and the oxidizing gas supply line. Pump having a compressor and an expander provided in the oxidizing gas discharge line,
The exhaust structure has a water separator connected to an outlet of the expander, and an exhaust pipe connected to the water separator,
A fuel cell vehicle, wherein the water separator is provided with a drainage port with an opening / closing mechanism below a connection portion between the exhaust pipe and the water separator. The fuel cell vehicle according to claim 6,
The fuel cell vehicle, wherein the opening / closing mechanism is a one-way valve that opens against a spring force. The fuel cell vehicle according to claim 7,
The fuel cell vehicle, wherein the one-way valve is set to have a valve opening pressure such that the one-way valve is opened when a total pressure of a gas pressure and a water pressure in the water separator becomes equal to or higher than a predetermined pressure.

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