JP2005129388A - Arrangement structure of fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve space utilizing efficiency in arranging a fuel cell system without reducing bending radius R of fluid pipes. <P>SOLUTION: A subframe 1 is mounted on a lower surface of a vehicle body skeleton frame under a vehicle floor, and a fuel cell 3 is mounted on the subframe 1. An air system part 5, a pure water system part 7, and a cooling water system part 9, connecting to a fluid pipe connecting part 11 of the fuel cell 3 through an air pipe 13, a pure water pipe 15, and cooling water pipe 17 respectively are arranged on the subframe 1 of the fuel cell 1 on the vehicle front side. A power interrupting device 19(JB) for interrupting power generated by the fuel cell 3 is arranged inside a bent part 17a of the cooling water pipe 17 and on the side surface of the fuel cell 3 near the fluid connecting part 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an arrangement structure of a fuel cell system.

  Since the fuel cell system has a complicated component configuration and increases the occupied area of the entire system, the fuel cell system is limited to a limited space, such as a fuel cell disposed under the floor of a vehicle as described in Patent Document 1 below. When arranging a fuel cell system, it is necessary to improve space efficiency.

At this time, in order to increase the space efficiency by reducing the gap between the parts as much as possible, for example, it is conceivable to arrange the fluid piping connected to the fuel cell so that the bending R is reduced and the parts are sewn.
JP 2001-71753 A

  However, the fluid piping for supplying or discharging the fuel cell has a larger diameter than the electric wiring, and it is difficult to reduce the bending R for space efficiency from the viewpoint of reducing pressure loss.

  An object of the present invention is to improve the space efficiency when arranging a fuel cell system without reducing the bending R of fluid piping.

  The present invention provides a power cut-off device provided with a fluid pipe connecting portion for connecting a fluid pipe to a fuel cell, and cutting off the supply of electric power generated by the fuel cell on the same side as the fluid pipe connecting portion of the fuel cell. And the fluid piping are the main features.

  According to the present invention, the power interruption device is disposed between the side surface on the same side as the fluid piping connection portion of the fuel cell and the fluid piping, thereby effectively utilizing the space near the fluid piping connection portion of the fuel cell. It is possible to improve the space efficiency when arranging the fuel cell system.

  It is difficult for the fluid piping connected to the fuel cell to take a small bend R from the viewpoint of pressure loss and the diameter. For this reason, even if the fluid piping is arranged along the vicinity of the fuel cell, a gap is generated between the fuel cell and the fluid piping. Further, it is advantageous for workability and freedom of displacement that the fluid piping is flexible and has a certain length.

  For these reasons, it is difficult to install components connected to the fuel cell via the fluid piping in the vicinity of the fluid piping connecting portion of the fuel cell. That is, it is difficult to effectively utilize the vicinity of the fluid piping connection portion of the fuel cell as an installation space for components connecting the fluid piping.

  Therefore, space efficiency can be improved by disposing a power interruption device that is not related to connection with the fluid piping in the vicinity of the fluid piping connection portion of the fuel cell.

  Also, in terms of the internal structure of the fuel cell, it is often advantageous to install a power interrupting device on the same side as the fluid piping, and it is often advantageous to take out power from the vicinity of the fluid piping connecting portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic plan view showing an arrangement structure of a fuel cell system according to the first embodiment of the present invention. This fuel cell system is mounted under the floor of a vehicle. A subframe 1 as a system mounting member is attached to the lower surface of a vehicle body frame (not shown) under the floor, and a fuel cell 3 is mounted on the rear side of the vehicle on the subframe 1. Install. In FIG. 1, the left side is the front of the vehicle.

  On the sub-frame 1 on the vehicle front side of the fuel cell 3 described above, the air system parts 5 and the pure water system parts are inclined from the right side in the vehicle width direction along the vehicle width direction and toward the vehicle rear side. 7 and the cooling water system component 9 are arranged in order.

  The air system component 5 is for supplying the fuel cell 3 with air for reacting with hydrogen, and the pure water system component 7 is for supplying pure water to the solid electrolyte membrane of the fuel cell 3 for humidification, The cooling water system component 9 is for supplying cooling water that dissipates heat generated by the power generation of the fuel cell 3.

  A fluid pipe connecting portion 11 is provided on the side surface on the vehicle front side at the right end of the fuel cell 3 in the vehicle width direction, that is, the side surface facing the air system component 5. One end of each of the air pipe 13, the pure water pipe 15 and the cooling water pipe 17 is connected to the fluid pipe connecting portion 11, and the other end of each of the air pipe 13, the pure water pipe 15 and the cooling water pipe 17 is connected to the fluid pipe connecting portion 11. The air system component 5, the pure water system component 7 and the cooling water system component 9 are connected.

  The air system component 5, the pure water system component 7 and the cooling water system component 9 described above constitute a fluid system component connected to the fluid piping connection portion 11 via the fluid piping.

  In FIG. 1, each of the above-described pipes 13, 15, and 17 is shown as a single pipe. However, in actuality, a fluid that supplies fluid from the parts 5, 7, and 9 to the fuel cell 3 is shown. A supply pipe and a fluid discharge pipe for discharging a fluid from the fuel cell 3 to each of the parts 5, 7, and 9 are included.

  The air pipe 13 is installed substantially linearly up to the air system component 5 in front of the vehicle of the fluid pipe connecting portion 11. The pure water pipe 15 and the cooling water pipe 17 are drawn forward from the fluid pipe connecting portion 11, bent toward the left side of the vehicle at bent portions 15 a and 17 a in the middle, and after being bent toward the left side in the vehicle width direction. It is extended.

  Then, inside the bent portion 17 a of the cooling water pipe 17, the side surface of the fuel cell 3 in the vicinity of the fluid pipe connection portion 11, that is, the side surface on the same side as the fluid pipe connection portion 11 of the fuel cell 3 and the cooling water. A power interruption device 19 (JB) that interrupts the supply of electric power generated by the fuel cell 3 is disposed on the subframe 1 between the pipe 17 and the pipe 17.

  The power cutoff device 19 cuts off the power supply to the vehicle drive motor 33 shown in FIG. 3 described later.

  Here, as the pure water system component 7, for example, a pump or the like is advantageously disposed in the upper part of the space under the center tunnel provided on the vehicle floor surface, when collecting pure water in the tank disposed in the lower part thereof, In addition, it is advantageous for securing insulation resistance. When the pure water pipe 15 is arranged to be easily connected to the fluid pipe connecting portion 11 of the fuel cell 3, as shown in FIG. A space is created between the pure water pipe 15 and the fuel cell 3.

  In addition, the air pipe 13 and the cooling water pipe 17 have a large pipe diameter and require a certain length in order to ensure a large bending radius and flexibility. For this reason, a space is generated in the vicinity of the fluid pipe connecting portion 11 between the cooling water pipe 17 provided with the bent portion 17 a and the fuel cell 3.

  Therefore, the power cutoff device 19 that is not connected to the fuel cell 3 by the fluid pipe is disposed in close proximity to the fuel cell 3 in the vicinity of the fluid pipe connection portion 11 of the fuel cell 3 so that the components of each fluid system described above are provided. It is possible to effectively utilize the space in the vicinity of the fluid pipe connecting portion 11 where it is difficult to arrange 5, 7, and 9.

  With the above-described configuration, the power interruption device 19 does not protrude outside the entire system, and the outer periphery of the subframe 1 becomes more linear and smooth, so that the in-vehicle performance of the fuel cell system can be improved.

  Moreover, since the power interruption device 19 is installed inside the subframe 1, it is not easily affected by road surface interference. Furthermore, since the treatment such as notching the subframe 1 is not required to install the power interruption device 19, the strength deterioration of the subframe 1 can be prevented.

  FIG. 2 shows a method of fixing the power interruption device 19 to the fuel cell 3. The power interruption device 19 is directly fixed to the fuel cell 3 by inserting fastening bolts 21 into mounting flanges 19 a provided on both sides thereof. With this configuration, when the power cutoff device 19 is fixed to the fuel cell 3, the power connection portion 23 that electrically connects the power cutoff device 19 and the fuel cell 3 can be fixed at the same time.

  Thereby, the connection of the electric power connection part 23 can be implemented more reliably. Moreover, since the power interruption device 19 that is directly fixed to the fuel cell 3 by the fastening bolt 21 can reduce the relative displacement with the fuel cell 3, the reliability of the power connection portion 23 can be improved.

  Even when the fuel cell 3 is soft-mounted using a vibration isolator or the like, since the power interrupt device 19 is directly fixed to the fuel cell 3, it is possible to prevent an excessive load from being applied to the power connection portion 23. . Furthermore, since the power interruption device 19 and the fuel cell 3 are fixed to each other, the potential between them can be easily equalized, and problems due to leakage can be prevented.

  FIG. 3 is a schematic plan view showing a state in which the above-described fuel cell system is mounted on the vehicle 25. In FIG. 3, the air system component 5, the pure water system component 7, the cooling water system component 9 and the air piping 13, the pure water piping 15, the cooling water piping 17, and the fluid piping connecting portion 11 shown in FIG. 1 are omitted. ing.

  When the fuel cell system is mounted under the floor of the vehicle 25, the power interrupting device 19 is disposed in the vicinity of the center tunnel 27 extending in the vehicle longitudinal direction on the vehicle floor surface. Specifically, a part of the power shut-off device 19 in the vehicle width direction faces a space below the center tunnel 27, and an electrical wiring (high voltage wiring) 29 is forward from the power shut-off device 19 to the front of the vehicle along this space. Have been routed. The electrical wiring 29 is connected to a vehicle driving motor 33 disposed between the front wheels 31. Reference numeral 35 denotes a rear wheel.

  In the configuration of FIG. 3 described above, the electrical wiring 29 that is thicker and has a larger bending radius R than the low-voltage wiring through which sensor signals and the like flow is routed in a straight line using the center tunnel 27. It is possible to secure a route for the electric wiring 29 to the motor room without affecting the space. Further, since the route of the electric wiring 29 is linear, the electric wiring 29 can be shortened compared to the case where the wiring is meandered.

  Furthermore, since the electric circuit breaker 19 is disposed in the vicinity of the center tunnel 27 at the center in the vehicle width direction, when receiving an impact from the side surface of the vehicle 25, it is less likely to receive the impact and reduces the risk of breakage. Can do.

  In FIG. 3, the electrical wiring 29 is routed from the electrical interrupting device 19 to the front of the vehicle. However, the electrical wiring 29 is routed to the rear of the vehicle along the center tunnel 27 and connected to other electrical components (not shown). May be.

  FIG. 4 is a plan view corresponding to FIG. 3, showing a second embodiment of the present invention. In this embodiment, when the fuel cell system is mounted under the floor of the vehicle 25, the relay unit 37 is installed in a space below the center tunnel 27, and the relay unit 37 and the electric power arranged on the side of the center tunnel 27 are arranged. The interruption device 19 is connected to the bus bar 39. And the electric wiring 29 is routed along the center tunnel 27 from the relay part 37 ahead of the vehicle.

  According to the second embodiment, by installing the relay portion 37 in a portion where the electrical wiring 29 can be easily connected, the electrical wiring that is thick and has a large bending R without being restricted by the arrangement and orientation of the power cutoff device 19. 29 can be pulled out forward of the vehicle. Of course, electric wiring may be routed from the relay portion 37 to the rear of the vehicle and connected to other electric components (not shown).

  Further, as a third embodiment, as shown in FIG. 5, a relay unit 41 is arranged on the side of the fuel cell 3, and the relay unit 41 and the power cut-off device 19 are connected via a bus bar 43. The electrical wiring (high voltage wiring) 45 may be routed from the portion 41 to the electrical component (strong electrical component) 47 disposed on the right side in the vehicle width direction behind the vehicle.

  In this way, it is possible to appropriately change the wiring position of the electric wiring depending on the arrangement of the electric components.

  According to the present invention, since the power shut-off device is fixed to the fuel cell, the connection of the power shut-off device to the fuel cell can be performed at the time of subassembly, and the quality of the connecting portion can be easily secured. Therefore, the reliability of the electrical connection portion can be improved. Further, even when the fuel cell is soft-mounted, it is possible to prevent an excessive load from acting on the electrical connection portion between the power cut-off device and the fuel cell. Furthermore, it is easy to equipotentialize the power interruption device and the fuel cell, and problems due to electric leakage can be prevented.

  By mounting the fuel cell on the system mounting member provided in the vehicle and disposing the fluid system component connected to the fluid piping connection portion via the fluid piping on the system mounting member on the fluid piping connection portion side of the fuel cell, The power interruption device provided on the side of the same side as the fluid piping connection part does not protrude to the outside of the system mounting member, the outer periphery of the system mounting member can be made as smooth as possible, and the space such as the vehicle is limited Mountability on the place can be improved.

  Since the fuel cell is mounted under the floor of the vehicle and the power cut-off device is arranged near the space under the center tunnel provided on the vehicle floor, electric wiring for supplying power that is thicker and has a larger bending radius than the signal line is provided. It can be routed in the front-rear direction using the center tunnel, and it is possible to secure a route to the motor room and the rear of the vehicle without affecting the space in the vehicle interior, leading to shortened electrical wiring. Moreover, since the power interruption device is disposed in the vicinity of the center tunnel in the center of the vehicle width direction, it is difficult to receive an impact from the side of the vehicle, and the risk of breakage can be reduced.

  The relay section provided between the power shut-off device and the electrical wiring connected to the power shut-off device makes it easy to connect the electrical wiring when routing thick electrical wiring in any direction such as the front or rear of the vehicle. Regardless of the location and orientation of the power shutoff device (even when the power shutoff device is connected to the fuel cell), the electrical wiring from the power shutoff device can be drawn out in any direction, The layout and connection workability of the shut-off device can be improved.

It is a top view which shows the arrangement structure of the fuel cell system concerning the 1st Embodiment of this invention. It is explanatory drawing which shows the fixing method with respect to the fuel cell of the electric power interruption apparatus used for the fuel cell system of FIG. It is a top view which shows the state which mounted the fuel cell system of FIG. 1 in the vehicle. It is a top view equivalent to FIG. 3 which shows the 2nd Embodiment of this invention. It is a top view equivalent to FIG. 3 which shows the 3rd Embodiment of this invention.

Explanation of symbols

1 Subframe (system mounting member)
3 Fuel cell 5 Air system parts (fluid system parts)
7 Pure water system parts (fluid system parts)
9 Cooling water system parts (fluid system parts)
11 Fluid piping connection 13 Air piping (fluid piping)
15 Pure water piping (fluid piping)
17 Cooling water piping (fluid piping)
19 Power interruption device 25 Vehicle 27 Center tunnel 29, 45 Electrical wiring 37, 41 Relay section

Claims (5)

  Provided with a fluid piping connection portion for connecting a fluid piping to the fuel cell, and a power cutoff device that cuts off the supply of power generated by the fuel cell, the side surface of the fuel cell on the same side as the fluid piping connection portion and the fluid piping An arrangement structure of a fuel cell system, which is arranged between   2. The fuel cell system arrangement structure according to claim 1, wherein the power shut-off device is fixed to the fuel cell.   A fluid system component in which the fuel cell is mounted on a system mounting member provided in a vehicle and connected to the fluid piping connection portion via the fluid piping on the system mounting member on the fluid piping connection portion side of the fuel cell. The fuel cell system arrangement structure according to claim 1 or 2, wherein the fuel cell system arrangement structure is arranged.   The fuel cell according to any one of claims 1 to 3, wherein the fuel cell is mounted under a vehicle floor, and the power cut-off device is disposed in the vicinity of a space under a center tunnel provided on the vehicle floor surface. System layout structure.   The arrangement structure of the fuel cell system according to any one of claims 1 to 4, wherein a relay portion is provided between the power shut-off device and an electrical wiring connected to the power shut-off device.

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