WO2005102759A1

WO2005102759A1 - Fuel cell vehicle with battery in vehicle floor

Info

Publication number: WO2005102759A1
Application number: PCT/JP2005/007573
Authority: WO
Inventors: Tetsuo Uozumi
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2004-04-19
Filing date: 2005-04-14
Publication date: 2005-11-03
Anticipated expiration: 2006-10-19
Also published as: JP2005306104A

Abstract

A fuel cell vehicle (FV) is provided with a fuel cell (3), a motor (2) adapted to be supplied with electric power from the fuel cell to drive a vehicle wheel (1), and a battery (6, 16) capable of charging and discharging. The motor is located in a motor room (5) of a vehicle body (4), the battery is located in a space below a floor panel (8) of the vehicle body, and the motor room is disposed in an area other than the space below the floor panel of the vehicle body.

Description

DESCRIPTION

FUEL CELL VEHICLE WITH BATTERY IN VEHICLE FLOOR

TECHNICAL FIELD The present invention relates to a fuel cell vehicle and, more particularly, to a fuel cell vehicle with a layout wherein component parts of a fuel cell system are disposed in a vehicle body to exhibiting increased space utility.

BACKGROUND ART In fuel cell vehicles provided with fuel cell systems, proposal have been made to provide a structure wherein main component parts, such as a motor and a fuel cell (fuel cell stack), are located in a motor room of the vehicle body in a front area thereof and a hydrogen storage device, forming a fuel gas supply source, is located in a rear trunk and surrounding area thereof. Further, another proposal has been made to provide a structure wherein other component parts, such as a battery and power shut-off device operative to shut off electric power to be outputted from the battery, further included in the fuel cell system of the fuel cell vehicle, are located in a remaining space such as an area behind rear seat (see Japanese Patent Application Laid-Open Publication No. 2002-370544 (on page 6 and in FIG. 2) and Japanese Patent Application Laid-Open Publication No. 2003-72392 (on pages 2 and 3 and in FIG. 1)).

DISCLOSURE OF INVENTION However, upon studies conducted by the present inventor, if the battery and power shut-off device are located behind the rear seat like the structure as proposed above, inconveniences occur wherein reduction occurs in a trunk space and accommodation space or the vehicle absolutely has less spaces in such areas. Further, with front wheel drive type fuel cell vehicles, a length of wire harness increases by a length corresponding to a distance between the area behind the rear seat and the motor room present in a front area of the vehicle body. To the extent corresponding to an increase in a length of the wire harness, it becomes difficult to perform wiring work with the resultant increase in mass and costs. Further, under current situations where there exists a mainstream of automotive vehicles that are equipped with commonly used internal combustion engines such as gasoline engines and diesel engines, it has been awaited to establish a layout technology to enable vehicle body structures, on which such internal combustion engines are installed, to be applied to the fuel cell vehicles as many as possible to mount the component parts of the fuel cell systems therein on mass production. Thus, the present invention has been completed with the above studies in mind conducted by the present inventor and has an object to provide its fuel cell vehicle that is excellent in a space utility to enable component parts, forming a fuel cell system, to be located in an underfloor space without sacrificing a trunk space. To achieve the above object, one aspect of the present invention provides a fuel cell vehicle comprising: a fuel cell; a motor adapted to be supplied with electric power from the fuel cell to drive a vehicle wheel, the motor being located in a motor room of a vehicle body; and a battery capable of charging and discharging, the battery being located in a space below a floor panel of the vehicle body, and the motor room being disposed in an area other than the space below the floor panel of the vehicle body. Other and further features, advantages, and benefits of the present invention will become more apparent from the following description taken in conjunction with the following drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view showing a fuel cell vehicle of a first embodiment according to the present invention as viewed from the underside of a vehicle body; FIG. 2 is a perspective view showing a layout condition of main component parts, forming a fuel cell system, of the fuel cell vehicle of the presently filed embodiment as viewed from the upside of the vehicle body; FIG. 3 is a side view transparently illustrating a partial part of the fuel cell vehicle of the presently filed embodiment; FIG. 4A is a schematic perspective view illustrating a layout condition of a battery and a power shut-off device located in an underfloor space of the fuel cell vehicle of the presently filed embodiment as viewed from the upside of the vehicle body; FIG. 4B is a front view of the layout condition shown in FIG. 4A as viewed in a direction A; FIG. 5A is a schematic perspective view illustrating a layout condition of the battery, the power shut-off device and a control device located in an underfloor space of a fuel cell vehicle of a second embodiment according to the present invention as viewed from the upside of a vehicle body; FIG. 5B is a front view of the layout condition shown in FIG. 5 A as viewed in a direction B; FIG. 6 is a side view transparently illustrating a partial part of a fuel cell vehicle of a third embodiment according to the present invention wherein a cooling device for cooling a battery is located in the vicinity of a vehicle compartment air-conditioning device that blows an air-conditioning wind to a vehicle compartment; FIG. 7 is a side view transparently illustrating a partial part of a fuel cell vehicle of a fourth embodiment according to the present invention wherein a connecting pipe is connected to the battery for supplying cooling air thereto from an air supply device (a vehicle compartment air-conditioning device); FIG. 8 is a side view transparently illustrating a partial part of a fuel cell vehicle of a fifth embodiment according to the present invention wherein an air intake device is located in an underfloor space for blowing a running wind to the battery; and FIG. 9 is a side view transparently illustrating a partial part of a fuel cell vehicle of a sixth embodiment according to the present invention wherein a battery with a different capacity is located in an underfloor space of a vehicle body. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, fuel cell vehicles of various embodiments according to the present invention are described with reference to the accompanying drawings. Incidentally, throughout the accompanying drawings, the x-axis, y-axis and z-axis form a three-axis rectangular coordinate system wherein the x-axis designates a rearward direction of a vehicle, the y-axis designates the rightward direction of the vehicle and z-axis designates the upward direction of the vehicle. (First Embodiment) First, a fuel cell vehicle of a first embodiment according to the present invention is described with reference to FIGS. 1 to 4B. FIG. 1 is a perspective view showing a fuel cell vehicle of the presently filed embodiment as viewed from the underside of a vehicle body; FIG. 2 is a perspective view showing a layout condition of main component parts, forming a fuel cell system, of the fuel cell vehicle of the presently filed embodiment as viewed from the upside of the vehicle body; FIG. 3 is a side view transparently illustrating a partial part of the fuel cell vehicle of the presently filed embodiment; FIG. 4A is a schematic perspective view illustrating a layout condition of a battery and a power shut-off device located in an underfloor space of the fuel cell vehicle of the presently filed embodiment as viewed from the upside of the vehicle body; and FIG. 4B is a front view of the layout condition shown in FIG. 4A as viewed in a direction A. As shown in FIGS. 1 to 3, the fuel cell vehicle V of the presently filed embodiment is a vehicle in which main component parts, such as a motor 2 that drives front wheels 1 and a fuel cell 3 by which electric power is supplied to the motor 2, of the fuel cell system S are disposed in a motor room 5 of the vehicle body 4, that is, a so-called front-wheel drive type fuel cell vehicle. With such a fuel cell vehicle, the other component parts, such as a battery 6, serving as a secondary battery, and a power shut-off device 7, which shuts off electric power to be inputted to and outputted from the battery 6, than the main component parts such as the motor 2 and fuel cell 3 are disposed beneath a vehicle compartment C of the vehicle body 4, that is, in an area below a floor panel 8. Incidentally, electric power from the battery 6 is available to be supplied to auxiliary units of the fuel cell vehicle and excess electric power in the fuel cell 3 is available to be inputted to and charged in the battery 6. More particularly, as shown in FIGS. 4 A and 4B, the battery 6 is located in the area below the floor panel 8 on which a driver's seat and assistant driver's seat are located, and the power shut-off device 7 is located in a center tunnel 9 such that the power shut-off device 7 is mounted on the battery 6. Here, in an automobile in which an internal combustion engine, such as a commonly used gasoline engine, is mounted as a drive power source, an exhaust pipe is arranged, while escaping a transmission linkage structure, in a region beneath front seats FS, that is, a region beneath the driver's seat, assistant driver's seat and footwells of a driver and assistant driver. Thus, whereas a ground clearance must be enhanced, there is a limited available space in the area below the floor panel 8. Therefore, from a standpoint of commoditizing vehicle body structures for vehicles driven by internal combustion engines and vehicle body structures for fuel cell vehicles, there is a need for locating the battery 6 utilizing such a limited space. To this end, the battery 6 is, taken as one package, formed in a flattened configuration with a height H smaller in value than a width W and length L, which is accommodated in an accommodating section 8a, formed by the floor panel 8 that is deformed upward, that is, deformed in a structure that is convex upward in cross section taken on line along a vehicle widthwise direction. Under such a condition, with an attention focused on a clearance to a ground surface and a provision of a covering member by which lower portions of the relevant component parts are covered at needs, the battery 6 may preferably have a bottom wall that lies at a position higher than the other bottom wall of the floor panel 8 than the accommodating section 8a thereof. Further, with an attention focused on an aerodynamic configuration, these bottom walls may be set to lie at a substantially equal height to allow a bottom wall of the vehicle body to establish a flat-surface configuration. Also, the width W of the battery 6 may be set depending on a vehicle width; the length L may be possibly set in relation to the other related component parts, located in a region below the rear seat, and depending on a vehicle length and wheel base length; and the height H may be preferably set to a small value in the order of approximately 1/5 to 1/20 times a value of the width W. Further, the power shut-off device 7 is accommodated in the center tunnel 9, formed by the floor panel 8 deformed upward in a central area in the vehicle widthwise direction of the floor panel 8, that is, deformed in a structure that is a convex upward at the central area of the floor panel 8 in cross section, taken on line along the vehicle widthwise direction, and extends in the fore and aft direction of the vehicle body. The battery 6 and the power shut-off device 7 may include respective housings that are made common to each other to form a unitized structure, that is, a single housing, or may be merely formed in separate structures. With such a structure of the presently filed embodiment, as set forth above, a layout of the battery 6 placed below the floor panel 8 enables vehicle bodies to be commoditized, while providing a capability of effectively utilizing a trunk space and an accommodation space behind the vehicle compartment. In addition, a weight balance of a vehicle as a whole can be improved. Further, with the battery 6 located in the footwell areas beneath the driver's seat and assistant driver's seat, the wire harness 10 connected between the battery 6 and the fuel cell 3 can be made shorter than that of the harness in a structure wherein the battery 6 is located in the rear of the vehicle such as an area behind the rear seat, resulting in simplified wiring work. Furthermore, even in the presence of an air compressor, which supplies air, serving as oxygen containing gas, to the fuel cell 3, located in an area rearward of the vehicle behind the rear seat, a layout of the battery 6 located close proximity to the motor 2, adapted to be applied with greater electric power than that applied to the air compressor, enables reduction in a length of the thick wire harness 10. Moreover, since the battery 6 is disposed not only in the rearward area of the vehicle but also in the area below the floor panel 8, the battery 6 can be prevented from damages even in the presence of a collision at the rearward. Also, with the power shut-off device 7 located in the center tunnel 9, a further increased can be enhanced without adverse affects on the vehicle compartment. Besides, with the power shut-off device 7 is unitized with the battery 6 or located on the battery 6, an electrostatically charged area, caused when shutting off electric power, can be reduced. Further, in cases where the battery 6 and the power shut-off device 7 are unitized, a bus bar can be employed in place of the wire harness 10, enabling the shortening of an electric power delivery path. Furthermore, it is, of course, possible to remarkably simplify on-vehicle mounting workability to a greater extent than that attained by a structure wherein the battery 6 and the power shut-off device 7 are separately located in the vehicle body 4. Incidentally, while the presently filed embodiment has been described with reference to the front wheel drive vehicle, it will be appreciated that an alternative may be adopted based on the identical design concept wherein fore and aft areas are reversed in structure. Moreover, while the structure of the presently filed embodiment has been described on the premise that the vehicle bodies of the automobiles, which include internal combustion engines as drive power sources, and those, which include fuel cell stacks as drive power sources, can be commoditized, it is, of course, possible that the present embodiment can be theoretically applied to cases where only fuel cell vehicles are considered on design of vehicle bodies. (Second Embodiment) Next, a fuel cell vehicle of a second embodiment according to the present invention is described in detail mainly with reference to FIGS. 5A and 5B. FIG. 5A is a schematic perspective view illustrating a layout condition of the battery, the power shut-off device and a control device located in an underfloor space of a fuel cell vehicle of the presently filed embodiment as viewed from the upside of a vehicle body; and FIG. 5B is a front view of the layout condition shown in FIG. 5A as viewed in a direction B. As shown in FIGS. 5A and 5B, the presently filed embodiment differs from the structure of the first embodiment in that in addition to the battery 6 and power shut-off device 7, a control device 11 for controlling electric power to be supplied to or delivered from the battery 6 in view of a voltage of the battery is located below the floor panel 8 at an underfloor space of the vehicle body 4. Hereunder, with an attention focused on such a difference, the same component parts bear like reference numerals to suitably simplify or omit description. More particularly, with the presently filed embodiment, the battery 6 is disposed below the floor panel 8 at a driver's seat and assistant driver's seat, and the power shut-off device 7 and control device 11 are located in the center tunnel 9 to be mounted on the battery 6. < The power shut-off device 7 and control device 11 are placed in the center tunnel 9 adjacent to each other to have the positional relationship in an order such that the power shut-off device 7 and control device 11 are located on front and rear sides. The battery 6, the power shut-off device 7 and the control device 11 may take a structure wherein: the battery 6 and power shut-off device 7 are unitized upon commoditizing respective housings; all of the battery 6, the power shut-off device 7 and the control device 11 are unitized; or these component parts are separately formed like the first embodiment. Further, disposed in the center tunnel 9 are various connecting wires or harness to which the battery 6, the power shut-off device 7 and the control device 11 are connected. More particularly, fluid supply conduits, such as a battery cooling-air supply pipe 12, through which battery cooling-air is supplied to the battery 6, and battery cooling- water supply pipes 13, through which battery cooling- water is supplied to the battery 6, for the purpose of preventing degradation in battery performance resulting from developed heat and electrical wirings, such as the wire harness 10 involving a power line and signal lines, are disposed in the central tunnel 9. Incidentally, a battery cooling-water supply source may include an independent water supply source or a coolant water source commonly used for the fuel cell 3. As set forth above, with the structure of the presently filed embodiment, locating the power shut-off device 7 and, in addition, the control device 11 in the center tunnel 9 enables a vehicle space to be remarkably and more effectively utilized than that achieved by a structure with the control device 11 being located in the vehicle compartment. Particularly, permitting the control device 11 to be integrally formed with at least one of the battery 6 and power shut-off device 7 enables the associated component parts to be unitized, enabling reduction in costs with favorable on-vehicle mounting workability. Further, with the battery cooling-air supply conduit 12, the cooling- water supply conduit 13 and the wire harness 10 located in the center tunnel 9, an installation space and connection working space can be enhanced regardless of a vehicle compartment space. (Third Embodiment) Next, a fuel cell vehicle of a third embodiment according to the present invention is described in detail mainly with reference to FIG. 6. FIG. 6 is a side view transparently illustrating a partial part of a fuel cell vehicle of the presently filed embodiment wherein a cooling device for cooling a battery is located in the vicinity of a vehicle compartment air-conditioning device that blows an air-conditioning wind to a vehicle compartment C. With the presently filed embodiment, the structure of the second embodiment is further concretized in a structure, as shown in FIG. 6, and the presently filed embodiment differs from the second embodiment in that a battery-cooling fan 14, serving as a cooling device for cooling the battery 6 and connected with the battery 6 through the battery cooling-air supply conduit 12, is disposed in the vicinity of the vehicle compartment air-conditioning device 15 from which the air conditioning wind is blown out to the vehicle compartment. With an attention focused on such a difference, the same component parts bear like reference numerals to suitably simplify or omit descriptions. More particularly, with the presently filed embodiment, the battery-cooling fan 14 is located just under the vehicle compartment air-conditioning device 15. Cold air, supplied from such a battery-cooling fan 14, is supplied to the battery 6 through the battery cooling-air supply pipe 12 whose detail is also shown in FIGS. 5A and 5B. That is, as heat builds up in the battery 6 to raise operating temperatures, a drop occurs in battery performance. However, allowing cold air to impinge upon the battery 6 enables battery performance to be maintained or restored. As set forth above, with the structure of the presently filed embodiment, locating the battery-cooling fan 14 in the vicinity of the vehicle compartment air-conditioning device 15 suppresses an increase in weights caused by an increase in a pipe length of the battery cooling-air supply pipe 12 leading to the battery 6 with no need for the cooling fan to be installed in the vehicle at the rearward area thereof, expanding a space in the rear area of the vehicle. Also, additional separate noise and vibration measures can be dispensed with, providing compatibility between improvement in noise and vibration performance and weight saving of the vehicle as a whole. (Fourth Embodiment) Next, a fuel cell vehicle of a fourth embodiment according to the present invention is described in detail mainly with reference to FIG. 7. FIG. 7 is a side view transparently illustrating a partial part of a fuel cell vehicle of the presently filed embodiment wherein a connecting pipe is connected to the battery for supplying cooling air thereto from an air supply device (a vehicle compartment air-conditioning device). As shown FIG. 7, the presently filed embodiment differs from the third embodiment in that the battery-cooling fan 14 is dispensed with and a connecting pipe 16, through which cooling air is supplied from the vehicle compartment air-conditioning device 15 serving as an air supply source, is directly connected to the battery 6. Hereunder, with an attention focused on such a difference, the same component parts bear like reference numerals to suitably simplify or omit descriptions. In particular, the vehicle compartment air-conditioning device 15 has an original function to supply an air-conditioning wind to the vehicle compartment C but the presently filed embodiment contemplates to utilize such an air-conditioning wind as cooling air for cooling the battery 6. That is, the vehicle compartment air-conditioning device 15 is configured to have an additional function to cool the battery 6, which is susceptible to heat built-up, by means of cooling air supplied through the connecting pipe 16. As set forth above, with such a structure of the presently filed embodiment, utilizing the vehicle compartment air-conditioning device 15 for supplying cooling air to cool the battery 6 enables the battery cooling fan 14 to be dispensed with. Also, the number of component parts needed for addressing noise and vibration can be reduced, enabling the simplification in measures to noise and vibration. Further, since not only air in the vehicle compartment but also the battery can be cooled at arbitrary temperatures controllable by the vehicle compartment air-conditioning device 15, improvement in cooling performance and warm-up of the battery at a cold start can be achieved, resulting in a capability of achieving improvement over an input and output power characteristic of the battery with the resultant improvement in running performance and fuel saving of a vehicle. (Fifth Embodiment) Next, a fuel cell vehicle of a fifth embodiment according to the present invention is described in detail mainly with reference to FIG. 8. FIG. 8 is a side view transparently illustrating a partial area of the fuel cell vehicle of the presently filed embodiment in a structure wherein a running wind intake device (air intake device), through which a running wind is blow out to the battery, is located in an underfloor space of the vehicle. As shown FIG. 8, the presently filed embodiment differs from the second embodiment in that the running wind intake device 17 is additionally located in front of the battery 6 that is located below the floor panel 8, with a view to taking a running wind W into the battery 6. Hereunder, with an attention focused on such a difference, the same component parts bear like reference numerals to suitably simplify or omit descriptions. In particular, cold air, drawn by the running wind intake device 17, is directly blown to the battery 6, thereby cooling the battery 6 in which heat builds up. As set forth above, with such a structure of the presently filed embodiment, locating the running wind intake device 17, which blows the running wind to the battery 6, to the area below the floor panel 8 enables the running wind to be supplied to the battery 6 to which cooling air is also supplied from the battery cooling fan 14, enabling the battery 6 to be adequately cooled. Further, the load for driving the cooling fan 14 during traveling of the vehicle can be decreased, resulting in improvement in noise and vibration performance and improvement in fuel consumption of a vehicle. (Sixth Embodiment) Next, a fuel cell vehicle of a sixth embodiment according to the present invention is described in detail mainly with reference to FIG. 9. FIG. 9 is a side view transparently illustrating a partial area of the fuel cell vehicle of the presently filed embodiment in a structure wherein a battery with a different capacity is located in an underfloor space of the vehicle. The presently filed embodiment differs from the first embodiment in that the battery 16, having a smaller capacity than that of the battery 6 used in the first embodiment, is located below the floor panel 8, that is, in the accommodating section 8a. With the presently filed embodiment, the same component parts bear like reference numerals to suitably simplify or omit descriptions. As shown in FIG. 9, more particularly, the battery 16 of the presently filed embodiment has the same width and height as those of the battery 6 used in the first embodiment but a length shorter in a fore and aft direction, and to the extent that the battery 16 is reduced in size, the battery 16 has a reduced capacity. Incidentally, while the position at which the battery 16 is located in the fore and aft direction is set such that a front end of the battery 16 is aligned with the position at which the battery 6 is located, the locating position of the battery 16 is suitably altered depending on types of vehicles or the like. As set forth above, with such a structure of the presently filed embodiment, due to a capability for the battery 16 with the capacity different from that of the battery 6 to be located in the area below the floor panel 8, that is, in the accommodating section 8a, it becomes possible to realize a structure that allows a difference in vehicle performance or vehicle specification with an increased possibility of vehicle design without adversely affecting a space in the vehicle compartment. In summary, with the fuel cell vehicle of the present invention, the battery is located in the underfloor space of the vehicle body, enabling the prevention of reductions in the trunk space and accommodation space behind the rear seat. Further, since a distance between the fuel cell and the battery remains in a short range, the wire harness, through which these component parts are connected to each other, is enabled to have a shortened length, providing the ease of arranging work of wire harness which achieving reduction in mass and costs. Furthermore, this enables the component parts of the fuel cell system to be mounted by efficiently utilizing the vehicle body structures for motor vehicles on which commonly used internal combustion engines are installed. The entire content of a Patent Application No. TOKUGAN 2004-123082 with a filing date of April 19, 2004 in Japan is hereby incorporated by reference. Although the invention has been described above by reference to certain embodiments of the invention, the invention is not limited to the embodiments described above. Modifications and variations of the embodiments described above will occur to those skilled in the art, in light of the teachings. The scope of the invention is defined with reference to the following claims.

INDUSTRIAL APPPLICABILITY According to the present invention, as set forth above, since the battery is located in the underfloor space of the vehicle body, the trunk space and accommodation space behind the rear seat can be adequately ensured, providing the ease of arranging the wire harness while enabling the realization with the vehicle body structures for the motor vehicles, equipped with the commonly used internal combustion engines, and for those, equipped with the fuel cell stacks, commoditized. Therefore, such a fuel cell vehicle is applicable to various types of vehicles and expected to have wide range of applications.

Claims

CLAIMS 1. A fuel cell vehicle comprising: a fuel cell; a motor adapted to be supplied with electric power from the fuel cell to drive a vehicle wheel, the motor being located in a motor room of a vehicle body; and a battery capable of charging and discharging, the battery being located in a space below a floor panel of the vehicle body, and the motor room being disposed in an area other than the space below the floor panel of the vehicle body. 2. The fuel cell vehicle according to claim 1, wherein the motor room is disposed in a front area of the vehicle body. 3. The fuel cell vehicle according to claim 1, wherein the battery is accommodated in an accommodating section that is formed by the floor panel that is deformed upward. 4. The fuel cell vehicle according to claim 3, wherein the floor panel is formed with a center tunnel that is formed by the floor panel that is deformed upward to be contiguous with the accommodating section on an upper side thereof. 5. The fuel cell vehicle according to claim 4, further comprising a power shut-off device disposed in the center tunnel to shut off electric power to be inputted to and outputted from the battery. 6. The fuel cell vehicle according to claim 5, wherein the battery and the power shut-off device are unitized in structure. 7. The fuel cell vehicle according to claim 5, wherein the power shut-off device is located above the battery. 8. The fuel cell vehicle according to claim 5, further comprising an input and output control device disposed in the center tunnel to control electric power to be inputted to and outputted from the battery. 9. The fuel cell vehicle according to claim 8, wherein at least two of the battery, the power shut-off device and the input and output control device are unitized in structure. 10. The fuel cell vehicle according to claim 8, wherein the power shut-off device and the control device are disposed above the battery such that the power shut-off device and the control device are disposed in tandem. 11. The fuel cell vehicle according to claim 4, wherein a fluid conduit connecting an equipment inside the motor room and the battery is arranged in the center tunnel. 12. The fuel cell vehicle according to claim 4, wherein an electrical line connecting an equipment inside the motor room and the battery is arranged in the center tunnel. 13. The fuel cell vehicle according to claim 1, further comprising an air supply unit disposed in the vicinity of a vehicle compartment air-conditioning device to cool the battery. 14. The fuel cell vehicle according to claim 1, wherein cooling air from a vehicle compartment air-conditioning device cools the battery. 15. The fuel cell vehicle according to claim 1, further comprising an air intake device disposed below the floor panel to allow a running wind to be blown to the battery. 16. The fuel cell vehicle according to claim 1 , wherein the battery is adapted to be set under the floor panel so as to have a size to provide a capacity depending on the size thereof.