JP2018101473A - Fuel cell vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress collision of a fuel cell module and a tank, when collision occurs in a fuel cell vehicle.SOLUTION: A fuel cell vehicle includes a fuel cell module having a fuel cell stack, a tank for storing gas supplied to the fuel cell stack, a fuel cell housing chamber for housing the fuel cell module, a tank housing chamber formed on the rear side in the vehicle length direction for the fuel cell housing chamber in the underfloor of fuel cell vehicle and housing the tank, a body frame partially placed in the fuel cell housing chamber, and a fixing member connected with the fuel cell module and fixing it to the body frame, where the rigidity of connection of the fuel cell module and the fixing member is higher than that of the fixing member.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a fuel cell vehicle equipped with a fuel cell.

  As a fuel cell vehicle, a fuel cell module including a fuel cell stack is accommodated in an accommodation chamber provided in front of the passenger compartment, and a tank in which hydrogen gas is stored is accommodated in a hydrogen tank chamber provided under the floor of the passenger compartment. A fuel cell vehicle having a structure as described above has been proposed (see Patent Document 1). In the fuel cell vehicle of Patent Document 1, the fuel cell module is attached to the suspension member via a fixing member (mounting component). When this fixed part is destroyed when a collision occurs, the fuel cell module moves to the lower retreat space of the hydrogen tank chamber to avoid collision with the tank.

Japanese Patent Laying-Open No. 2015-231319

  However, in the fuel cell vehicle of Patent Document 1, when an external force accompanying a collision is applied to the fuel cell module and the fixing member, the connecting portion between the fuel cell module and the fixing member remains plastically deformed, and the fixing member is broken. It can happen that it is not. In this case, when the suspension member moves downward due to the external force accompanying the collision, the fuel cell module also moves downward together with the suspension member, but cannot move to the retreat space and may collide with the tank. Such a problem may occur in a configuration in which the fuel cell module is fixed to an arbitrary part of the vehicle body frame by a fixing member, such as a side member and a cross member, as well as the suspension member. For this reason, there is a demand for a technique that can suppress the collision between the fuel cell module and the tank when the collision of the fuel cell vehicle occurs.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

  According to one aspect of the present invention, a fuel cell vehicle is provided. The fuel cell vehicle includes a fuel cell module including a fuel cell stack; a tank that stores gas supplied to the fuel cell stack; a fuel cell storage chamber that houses the fuel cell module; and an underfloor of the fuel cell vehicle A tank housing chamber that is formed on the rear side in the vehicle length direction of the fuel cell vehicle with respect to the fuel cell housing chamber and houses the tank; and a vehicle body in which a part of the fuel cell housing chamber is disposed. A frame; and a fixing member that is connected to the fuel cell module and fixes the fuel cell module to the vehicle body frame; a rigidity of a connection portion between the fuel cell module and the fixing member is a rigidity of the fixing member Higher than

  According to the fuel cell vehicle of this embodiment, the rigidity of the connecting portion between the fuel cell module and the fixing member is higher than the rigidity of the fixing member. Therefore, when the collision of the fuel cell vehicle occurs, the connecting portion is plastically deformed. It is possible to increase the possibility that the fixing member is broken before the fixing, and to increase the possibility that the fixing of the fuel cell module to the vehicle body frame is released. For this reason, even when the vehicle body frame moves downward due to an external force accompanying a collision, the fuel cell module can be prevented from moving downward together with the main body frame, and the occurrence of a collision between the fuel cell module and the tank can be suppressed. .

  The present invention can be realized in various forms. For example, it can be realized in the form of a method for manufacturing a fuel cell vehicle, a method for fixing a fuel cell module and a body frame in the fuel cell vehicle, a fixing member for fixing the fuel cell module to the body frame, and the like.

It is sectional drawing which shows schematic structure of the fuel cell vehicle as one Embodiment of this invention. It is a block diagram which shows schematic structure of the fuel cell system mounted in the fuel cell vehicle. It is sectional drawing which shows schematic structure of a fuel cell module. It is a perspective view which shows the structure of a case and a support frame. It is sectional drawing which expands and shows the 5-5 cross section shown in FIG. It is explanatory drawing which shows typically the mode of the attachment mechanism vicinity at the time of collision of a fuel cell vehicle. It is explanatory drawing which shows typically the mode of the attachment mechanism vicinity at the time of the collision generation | occurrence | production in a comparative example. It is sectional drawing which expands and shows the attachment mechanism vicinity of 2nd Embodiment. It is sectional drawing which expands and shows the attachment mechanism vicinity of 3rd Embodiment.

A. First embodiment:
A1. Overall vehicle configuration:
FIG. 1 is a cross-sectional view showing a schematic configuration of a fuel cell vehicle 500 as an embodiment of the present invention. FIG. 1 shows a cross section along the forward direction FD and the backward direction RD of the vehicle at the center position in the vehicle width direction LH of the fuel cell vehicle 500 at the normal time when no collision occurs. Hereinafter, the front direction FD and the rear direction RD are collectively referred to as “vehicle length direction”. The fuel cell vehicle 500 includes the fuel cell module 100 as an electric power source, and the rear wheel RW is driven by driving a motor M that is a power source. In addition, in FIG. 1, in addition to the vehicle width direction LH, the front direction FD, and the rear direction RD, the gravity direction, that is, the vertically downward G is illustrated. Symbols and arrows indicating directions in FIG. 1 correspond to symbols and arrows indicating directions in other drawings.

  In the fuel cell vehicle 500, a passenger compartment 510, a fuel cell accommodation chamber 520, and a tank accommodation chamber 530 are formed.

  The passenger compartment 510 is a room in which an occupant rides, and is provided with a plurality of seats as indicated by broken lines in FIG. The passenger compartment 510 is substantially located in a region sandwiched between the pair of front wheels FW and the pair of rear wheels RW.

  The fuel cell accommodation chamber 520 accommodates the suspension member 550 and at least a part of components of a fuel cell system (a fuel cell system 200 described later) including the fuel cell module 100. The suspension member 550 is fixed to a side member (not shown). The fuel cell module 100 includes a fuel cell stack 101 and a support frame 150. As will be described later, the fuel cell module 100 further includes a case (a case 130 described later), which is omitted in FIG. The fuel cell stack 101 is a stacked body including a plurality of stacked single cells (single cells 11 described later). The support frame 150 is a plate-like member that supports the fuel cell stack 101 from below. The detailed configuration of the fuel cell module 100 including the fuel cell stack 101 and the support frame 150 will be described later. As shown in FIG. 1, the fuel cell module 100 is disposed so as to be inclined downward toward the tank 20 in the vehicle length direction. In other words, the fuel cell module 100 is disposed so as to be inclined with respect to the horizontal direction so as to be positioned downward in the backward direction RD. The reason why the fuel cell module 100 is arranged in an inclined manner is that water in the fuel cell stack 101 is collected in the backward direction RD using gravity and easily discharged from the fuel cell stack 101. .

  The fuel cell module 100 is fixed to the suspension member 550 by a mount bracket and a mount member. Specifically, the front end FD of the fuel cell module 100 is fixed to the suspension member 550 by the front mount member 430 and the front mount bracket 410. Further, the rear mount member 440 and the rear mount bracket 420 fix the end portion of the fuel cell module 100 in the rearward direction RD to the suspension member 550. The front mount member 430 and the rear mount member 440 are connected to the suspension member 550. The front mount bracket 410 is connected to the front mount member 430 and the fuel cell module 100 (more precisely, the support frame 150). The rear mount bracket 420 is connected to the rear mount member 440 and the fuel cell module 100 (more precisely, the support frame 150).

  The tank storage chamber 530 stores the tank 20 that stores hydrogen gas. The tank storage chamber 530 is formed in the rearward direction RD with respect to the fuel cell storage chamber 520 under the floor of the fuel cell vehicle 500. The tank storage chamber 530 is formed along the vehicle length direction at the approximate center in the vehicle width direction LH. The ceiling portion of the tank storage chamber 530 is formed by the floor panel of the passenger compartment 510. A portion corresponding to the tank housing chamber 530 on the floor of the passenger compartment 510 protrudes upward in the vertical direction as compared with other portions of the floor. Thus, the tank storage chamber 530 has a structure similar to that of the center tunnel in which the drive shaft is arranged in a vehicle equipped with an engine. In addition to the tank 20, a wire harness (not shown) and the like are accommodated in the tank accommodation chamber 530.

A2. Configuration of fuel cell system:
FIG. 2 is a block diagram showing a schematic configuration of the fuel cell system 200 mounted on the fuel cell vehicle 500. In addition to the fuel cell stack 101 described above, the fuel cell system 200 includes a gas-liquid separator 29, a tank 20, an air compressor 30, a shut-off valve 24, an injector 25, an exhaust / drain valve 26, and a circulation pump 27. A three-way valve 33, a pressure regulating valve 34, a fuel gas supply path 21, a fuel gas circulation path 22, a fuel gas discharge path 23, an oxidant gas supply path 31, and an oxidant gas discharge path 32, A bypass channel 35 and a DC-DC converter 210 are provided. In addition, the fuel cell system 200 includes a mechanism (not shown) that circulates the cooling medium through the fuel cell stack 101.

  The fuel cell stack 101 includes a plurality of unit cells 11 stacked, and includes a pair of end plates 110 and 120 at both ends in the stacking direction. Each single cell 11 is a solid polymer fuel cell, and a fuel gas supplied to an anode side catalyst electrode layer provided with a solid polymer electrolyte membrane interposed therebetween, and an oxidant gas supplied to a cathode side catalyst electrode layer Electric power is generated by an electrochemical reaction with In the first embodiment, the fuel gas is hydrogen gas, and the oxidant gas is air. The fuel cell stack 101 is installed such that the end plate 110 is positioned in the forward direction FD and the end plate 120 is positioned in the backward direction RD. The catalyst electrode layer includes a catalyst, for example, carbon particles supporting platinum (Pt) and an electrolyte. In the single cell 11, a gas diffusion layer formed of a porous body is disposed outside the catalyst electrode layers on both electrode sides. As the porous body, for example, carbon porous bodies such as carbon paper and carbon cloth, and metal porous bodies such as metal mesh and foam metal are used. A manifold (not shown) for circulating fuel gas, oxidant gas, and cooling medium is formed in the fuel cell stack 101 along the stacking direction SD of the single cells 11. The single cell 11 is not limited to a polymer electrolyte fuel cell, but may be any type of fuel cell such as a solid oxide fuel cell.

  The pair of end plates 110 and 120 have a function of sandwiching a stacked body including a plurality of single cells 11. Of the pair of end plates 110 and 120, the end plate 120 functions to supply fuel gas, oxidant gas, and cooling medium to a manifold formed in the fuel cell stack 101, and discharges these media. A function of providing a flow path. On the other hand, the end plate 110 does not have such a function. Each of the end plate 110 and the end plate 120 has a substantially plate-like appearance shape whose thickness direction coincides with the stacking direction SD.

  The tank 20 stores high-pressure hydrogen, and supplies hydrogen gas as fuel gas to the fuel cell stack 101 via the fuel gas supply path 21. As shown in FIG. 1, the tank 20 has a substantially cylindrical external shape, and is accommodated in the tank accommodating chamber 530 so that the longitudinal direction coincides with the vehicle length direction. The circulation pump 27 is disposed in the fuel gas circulation path 22, and sends the fuel gas discharged from the gas-liquid separator 29 (the fuel gas after water is separated) to the fuel gas supply path 21. The shut-off valve 24 is arranged in the vicinity of the fuel gas discharge port in the tank 20 and switches between execution and stop of the supply of hydrogen gas from the tank 20. The injector 25 is disposed in the fuel gas supply path 21 and adjusts the supply amount (flow rate) and pressure of hydrogen gas to the fuel cell stack 101. The gas-liquid separator 29 is connected to a fuel gas discharge manifold in the fuel cell stack 101, separates and discharges water contained in the off-gas discharged from the manifold, and gas after water is separated ( Fuel gas). The exhaust drain valve 26 is disposed in the fuel gas discharge path 23 and switches between executing and stopping the discharge of water and off-gas from the gas-liquid separator 29. The air compressor 30 supplies air as an oxidant gas to the fuel cell stack 101. The three-way valve 33 is arranged in the oxidant gas supply path 31, and supplies the oxidant gas supply path 31 among the total amount of air supplied from the air compressor 30 and the bypass flow path 35. Adjust the amount. The pressure adjusting valve 34 is disposed in the oxidant gas discharge path 32 and adjusts the pressure (so-called back pressure) on the cathode discharge side in the fuel cell stack 101.

  The fuel gas distribution in the fuel cell system 200 will be described. Hydrogen gas supplied from the tank 20 is supplied to the fuel cell stack 101 via the fuel gas supply path 21. Off-gas (anode-side off-gas) discharged from the fuel cell stack 101 is supplied to the gas-liquid separator 29, and at least a part of water contained in the off-gas is separated. The off gas (that is, the fuel gas) after the water is separated is returned to the fuel gas supply path 21 via the fuel gas circulation path 22 and the circulation pump 27 and is supplied to the fuel cell stack 101 again. From the gas-liquid separator 29, in addition to the water separated from the off-gas, a part of the off-gas supplied to the gas-liquid separator 29 passes through the exhaust drain valve 26 to the fuel gas discharge path 23. To be discharged. The fuel gas discharge path 23 is connected to the oxidant gas discharge path 32, and the water and anode side off-gas discharged to the fuel gas discharge path 23 together with the water and cathode-side off gas discharged from the fuel cell stack 101 are oxidized. The gas is discharged to the atmosphere via the gas discharge path 32. The fuel gas discharge path 23 communicates with the oxidant gas discharge path 32 that is open to the atmosphere, whereas a back pressure higher than the atmospheric pressure is applied to the inside of the gas-liquid separator 29. Therefore, there is a pressure difference across the exhaust drain valve 26. Therefore, when the exhaust / drain valve 26 is opened, off-gas is discharged from the gas-liquid separator 29 to the fuel gas discharge path 23 due to the pressure difference described above.

  The flow of the oxidant gas in the fuel cell system 200 will be described. Air (compressed air) supplied from the air compressor 30 is supplied to the fuel cell stack 101 via the oxidant gas supply path 31. At this time, the supply amount to the fuel cell stack 101 can be adjusted by adjusting the opening degree of the three-way valve 33. Off-gas (cathode-side off-gas) and water discharged from the fuel cell stack 101 are discharged to the oxidant gas discharge path 32 via the pressure adjustment valve 34. The oxidant gas discharge path 32 is connected to the fuel gas discharge path 23 as described above, and is also connected to the bypass flow path 35. Therefore, the cathode-side off gas discharged from the fuel cell stack 101 is discharged to the atmosphere together with the anode-side off gas and water discharged through the fuel gas discharge passage 23 and the air discharged through the bypass passage 35. Is done.

  Here, as described above, since the fuel cell stack 101 is disposed to be inclined with respect to the horizontal direction so as to be positioned downward in the backward direction RD, the end plate 120 is disposed in the fuel cell stack 101. It will be located in the lowest vertical G. Therefore, the water in the fuel cell stack 101 travels toward the end plate 120 according to gravity through various manifolds, and drainage from the fuel cell stack 101 is promoted.

  The pair of current collecting plates 103F and 103R in the fuel cell stack 101 are electrically connected to the DC-DC converter 210. The DC-DC converter 210 is electrically connected to the motor M, boosts the output voltage of the fuel cell stack 101 and supplies the boosted voltage to the motor M.

  The operations of the exhaust / drain valve 26, the air compressor 30, the circulation pump 27, and other valves described above are controlled by a control unit (not shown). The control unit includes, for example, a ROM (Read Only Member) in which a control program is stored, a CPU (Central Processing Unit) that reads and executes the ROM, and a RAM (Random Access) that is used as a work area of the CPU. Memory).

A3. Fuel cell module configuration:
FIG. 3 is a cross-sectional view showing a schematic configuration of the fuel cell module 100. FIG. 3 shows a cross section of the fuel cell module 100 at the same position as in FIG. The fuel cell module 100 includes a case 130 in addition to the fuel cell stack 101 and the support frame 150 described above.

  The fuel cell stack 101 includes a plurality of unit cells 11 stacked as described above, a pair of end plates 110 and 120, and a pair of current collecting plates 103F and 103R, and a pair of insulating plates 102F and 102R. . The pair of current collector plates 103F and 103R functions as a comprehensive electrode. The current collecting plate 103 </ b> F is disposed in contact with the single cell 11 on the forward direction FD side of the single cell 11 positioned at the foremost position among the plurality of single cells 11. The current collector plate 103 </ b> R is disposed in contact with the single cell 11 on the rearward direction RD side of the rearmost single cell 11 among the plurality of single cells 11. The pair of insulating plates 102F and 102R are plate-like members formed of an insulating material. The insulating plate 102F is sandwiched between the end plate 110 and the current collector plate 103F, and suppresses electrical connection between the end plate 110 and the current collector plate 103F. Similarly, the insulating plate 102R is sandwiched between the end plate 120 and the current collector plate 103R, and suppresses electrical connection between the end plate 120 and the current collector plate 103R.

  The case 130 accommodates other parts of the fuel cell stack 101 except for the end plate 120. In other words, the case 130 accommodates the fuel cell stack 101 with the end plate 120 exposed. In the first embodiment, the case 130 is made of aluminum (Al). In addition, not only aluminum but stainless steel (SUS), titanium (Ti), or an alloy of these metals may be used. Moreover, not only a metal but you may form by resin etc.

  FIG. 4 is a perspective view showing configurations of the case 130 and the support frame 150. In FIG. 4, the upper side shows an external perspective view of the case 130 in a state where the fuel cell stack 101 is accommodated, and the lower side shows an external perspective view of the support frame 150. FIG. 4 also shows a front mount bracket 410 and a rear mount bracket 420 connected to the support frame 150.

  The case 130 has a cylindrical external shape that is open at the end in the rearward direction RD and has a hollow inside. In the space inside the case 130, other parts of the fuel cell stack 101 other than the end plate 120 are accommodated. At the end in the rearward direction RD of the case 130, a flange portion 132 formed so as to be bent upward is formed. A plurality of screw holes (not shown) are formed on the end surface of the case 130 including the flange 132. In the end plate 120, screw holes (not shown) are formed at positions corresponding to the plurality of screw holes. Therefore, in a state where the end plate 120 and the case 130 are in contact with each other, the screw hole of the end plate 120 and the screw hole of the case 130 communicate with each other. The end plate 120 and the case 130 are fastened to each other by inserting and screwing the screw 160 into the communicating screw hole.

  Fixing portions 131 are formed at the four corners of the bottom of the case 130, respectively. The fixing portion 131 protrudes in a substantially horizontal direction, and a through hole is formed in the center portion so as to penetrate in the thickness direction.

  The support frame 150 has a plate-like appearance. The support frame 150 has a structure in which reinforcing struts (not shown) are arranged in an internal space of a hollow hexahedron composed of six wall portions. The support frame 150 is formed with four through holes 159 penetrating in the thickness direction. These through holes 159 are formed at positions corresponding to the through holes of the fixing portion 131 of the case 130 and the vertically downward G. The case 130 is placed on the upper surface of the support frame 150, bolts (not shown) are inserted into the through holes of the fixing portion 131 and the through holes 159 of the support frame 150, and the bolts are arranged on the bottom surface of the support frame 150 (not shown). The case 130 is fastened to the support frame 150 by screwing with the nut.

  As shown in FIG. 4, four connecting collar members 450 are exposed on the upper surface of the support frame 150. The connecting collar member 450 constitutes a part of an attachment mechanism (an attachment mechanism 490 described later) for attaching the support frame 150 to the front mount bracket 410 and the rear mount bracket 420.

A4. Detailed structure of mounting mechanism:
FIG. 5 is an enlarged cross-sectional view of the 5-5 cross section shown in FIG. In FIG. 5, a part of the support frame 150 and the rear mount bracket 420 is omitted. As shown in FIG. 5, the support frame 150 includes an upper surface wall portion 151 that forms its upper surface, a lower surface wall portion 152 that forms its lower surface, and a support column 153. Both the upper surface wall 151 and the lower surface wall 152 have a thin plate shape, and are arranged in parallel to each other at a predetermined distance along the thickness direction TD of the support frame 150. The column portion 153 has an elongated plate-like appearance and is disposed in an internal space 154 sandwiched between the upper surface wall portion 151 and the lower surface wall portion 152. The support columns 153 are connected to the upper surface wall 151 and the lower surface wall 152, respectively, and partition the internal space 154 into a plurality of spaces. The strength of the support frame 150 is improved by the support column 153.

  In the upper surface wall 151 and the lower surface wall 152, four through holes are formed at positions corresponding to each other in the thickness direction TD, and an attachment mechanism 490 is disposed at a portion where each through hole is formed. In FIG. 5, the through holes 155 formed in the upper surface wall portion 151 correspond to the through holes 156 formed in the lower surface wall portion 152 in the thickness direction TD, and these through holes 155, 156. An attachment mechanism 490 is disposed in the portion where the is formed.

  The rear mount bracket 420 is a bent thin plate member, and is formed of aluminum (Al) in the present embodiment. The rear mount bracket 420 includes a first pedestal portion 421, a second pedestal portion 422, and an inclined portion 423. The first pedestal portion 421 is disposed in parallel with the lower surface wall portion 152 of the support frame 150 and is connected to the support frame 150 by the attachment mechanism 490. A through hole 425 is formed in the first pedestal portion 421. The rear mount bracket 420 is connected to the support frame 150 in a state where the through hole 425 is disposed so as to communicate with the through hole 156 of the support frame 150. The second pedestal portion 422 is connected to the rear mount member 440 shown in FIG. The rear mount bracket 420 corresponds to a subordinate concept of the fixing member in the claims. The inclined portion 423 connects the first pedestal portion 421 and the second pedestal portion 422. As shown in FIGS. 4 and 5, the inclined portion 423 is arranged so as to go in the vehicle width direction LH and in the vertical downward direction G as it goes in the vertical downward direction G.

  The attachment mechanism 490 includes a bolt 310, a nut 320, and the connecting collar member 450 described above. The bolt 310 is inserted into the through hole 425 of the rear mount bracket 420 and the through hole 156 of the lower surface wall portion 152 from below to above. The tip of the shaft portion 311 of the bolt 310 is located in the internal space 154. The nut 320 is disposed in the internal space 154 and is screwed with the bolt 310. A central portion on the lower surface of the nut 320, that is, a portion in the vicinity of the screw hole of the nut 320 protrudes downward and is fitted in the through hole 156. As shown in FIG. 5, the lower wall portion 152 and the first pedestal portion 421 are sandwiched between the flange portion of the bolt 310 and the bottom surface of the nut 320 and joined to each other. In this embodiment, both the bolt 310 and the nut 320 are made of iron.

  The connecting collar member 450 has a bottomed cylindrical appearance. The connecting collar member 450 has a cylindrical portion 452 and a lid portion 451. The cylindrical portion 452 has a cylindrical appearance and is inserted into the through hole 155 from above. The cylindrical portion 452 covers the upper end of the nut 320 in an annular shape. The overlapping portion 321 covered with the cylindrical portion 452 in the nut 320 is welded to the cylindrical portion 452. In the space inside the cylindrical portion 452, the tip of the bolt 310 is accommodated. The lid 451 has a thin columnar appearance, and the diameter in plan view is larger than the diameter of the through hole 155. The central portion of the lid portion 451 is connected to the upper end of the cylindrical portion 452 and closes the space inside the cylindrical portion 452 upward. The peripheral portion of the lid portion 451 is in contact with the peripheral portion of the through hole 155 on the upper surface of the upper surface wall portion 151. In the present embodiment, the connecting collar member 450 is made of aluminum.

  Such an attachment mechanism 490 is assembled to the support frame 150 and the rear mount bracket 420 as follows. First, the nut 320 and the connecting collar member 450 are welded to obtain a composite member, and the composite member is inserted into the through hole 155 from the upper surface side of the upper surface wall portion 151. Thereafter, the bolt 310 is inserted into the through hole 425 of the rear mount bracket 420 and the through hole 156 of the lower surface wall portion 152 and screwed into the nut 320.

  By connecting the rear mount bracket 420 to the support frame 150 by the mounting mechanism 490, the rigidity of the connection portion CP1 between the rear mount bracket 420 and the support frame 150 is higher than the rigidity of the rear mount bracket 420 itself. . This is because the bolt 310 and the nut 320 that sandwich and fix the support frame 150 (the lower surface wall portion 152) and the rear mount bracket 420 (the first pedestal portion 421) are in contact with the upper surface wall portion 151 via the connecting collar member 450. Therefore, when an external force is applied to the connection portion CP1, the force can be transmitted to the upper surface wall 151 in addition to the lower surface wall 152.

  FIG. 6 is an explanatory view schematically showing the state in the vicinity of the attachment mechanism 490 when a collision of the fuel cell vehicle 500 occurs. 6 shows a cross section at the same position as in FIG. For example, when a forward collision of the fuel cell vehicle 500 occurs and the suspension member 550 moves downward due to the impact, a downward external force F is applied to the rear mount bracket 420 as shown in FIG. At this time, a downward force is also transmitted to the attachment mechanism 490. Specifically, first, a downward force is transmitted to the bolt 310 that is in contact with the rear mount bracket 420, and a part of the force is transmitted to the nut 320 that is screwed with the bolt 310. A part of the force transmitted to the nut 320 is transmitted to the lower surface wall portion 152 in contact with the nut 320 and simultaneously transmitted to the connecting collar member 450 via the overlapping portion 321. The downward force transmitted to the connecting collar member 450 is transmitted from the lid portion 451 to the upper surface wall portion 151. In this way, part of the downward force transmitted to the attachment mechanism 490 due to the collision is transmitted to the lower surface wall portion 152 and the upper surface wall portion 151, respectively. For this reason, the plastic deformation of the connecting portion CP1, for example, the portion in contact with the nut 320 in the lower wall portion 152 and the vicinity thereof are suppressed from being plastically deformed.

  On the other hand, since the rigidity of the rear mount bracket 420 is lower than the rigidity of the connection portion CP1, the rear mount bracket 420 is broken as shown in FIG. 6 before the plastic deformation of the connection portion CP1 occurs. In FIG. 6, in the rear mount bracket 420, the inclined portion 423 is broken, but instead of the inclined portion 423, the first pedestal portion 421 or the second pedestal portion 422 is added to the inclined portion 423. It may break. As the rear mount bracket 420 is broken in this manner, the support frame 150 is released from the indirectly fixed state to the suspension member 550. Therefore, as the suspension member 550 moves downward, in other words, the fuel cell module 100 is restrained from being dragged by the suspension member 550 and moving downward. For this reason, even when the tank 20 is detached from the fixed member due to an impact at the time of collision and is moved in the forward direction FD by the inertial force, the collision between the fuel cell module 100 and the tank 20 is suppressed. For example, when the suspension member 550 is crushed (compressed) in the vehicle length direction due to an impact at the time of a collision, the front side of the suspension member 550 moves upward and the rear side downwards according to the shape of the suspension member 550 in a normal state. It is assumed that In this case, since the support frame 150 and the suspension member 550 are unfixed on the rear side of the suspension member 550, the fuel cell module 100 moves upward as the suspension member 550 moves forward. In such a case, the collision between the fuel cell module 100 and the tank 20 is more reliably suppressed.

  FIG. 7 is an explanatory view schematically showing a state in the vicinity of the attachment mechanism when a collision occurs in the comparative example. The attachment mechanism 890 of the comparative example includes only bolts 810 and nuts 820. The arrangement position of the bolt 810 and the nut 820 is the same as the arrangement position of the bolt 310 and the nut 320 of the first embodiment. That is, the rear mount bracket 420 is attached to the lower surface wall 152 by the attachment mechanism 890. Since the attachment mechanism 890 of the comparative example is in contact with only the lower surface wall 152 of the support frame 150, no force is transmitted to the upper surface wall 151 when an external force is applied. For this reason, the rigidity of the connecting portion CP10 is low and lower than the rigidity of the rear mount bracket 420.

  In such a configuration of the comparative example, when a collision occurs and a downward external force F is applied to the rear mount bracket 420, the rigidity of the connection portion CP10 is lower than the rigidity of the rear mount bracket 420. Prior to breaking, plastic deformation of the connecting portion CP10 occurs. Specifically, most of the downward force transmitted to the attachment mechanism 890 is transmitted to the lower surface wall 152 via the nut 820. For this reason, the bottom wall 152 is plastically deformed so that the portion in contact with the nut 320 and the vicinity thereof move downward, and the force applied to the rear mount bracket 420 is absorbed by the deformation. Therefore, the rear mount bracket 420 is not broken, and the fixed state between the rear side of the suspension member 550 and the fuel cell module 100 is maintained. For this reason, the rear side of the fuel cell module 100 moves downward as the suspension member 550 moves rearward, and may collide with the tank 20.

  On the other hand, as described above, the connection portion CP1 in the first embodiment has higher rigidity than the rear mount bracket 420, and therefore, when the collision occurs, the rear mount bracket 420 before the plastic deformation of the connection portion CP1 occurs. Breaking occurs. For this reason, at least the rear side of the fuel cell module 100 is indirectly fixed to the suspension member 550, and does not move downward as the suspension member 550 moves rearward, but collides with the fuel cell system 200. It is suppressed.

  According to the fuel cell vehicle 500 of the first embodiment described above, the rigidity of the connection portion CP1 between the fuel cell module 100 and the rear mount bracket 420 is higher than the rigidity of the rear mount bracket 420. In the event of a collision, it is possible to increase the possibility that the rear mount bracket 420 will be broken before the connecting portion CP1 is plastically deformed, and it is possible to release the fixation of the fuel cell module 100 to the suspension member 550. Can increase the sex. For this reason, even when the suspension member 550 moves downward due to an external force caused by the collision, it is possible to suppress the movement of the fuel cell module 100 according to the movement, and the occurrence of a collision between the fuel cell module 100 and the tank 20 can be prevented. Can be suppressed.

B. Second embodiment:
FIG. 8 is an enlarged cross-sectional view showing the vicinity of the attachment mechanism 490a of the second embodiment. In FIG. 8, the cross section in the same position as FIG. 6 of 1st Embodiment is shown. The fuel cell vehicle according to the second embodiment differs from the fuel cell vehicle 500 according to the first embodiment in that a support frame 150a is provided instead of the support frame 150 and an attachment mechanism 490a is provided instead of the attachment mechanism 490. Since other configurations in the fuel cell vehicle of the second embodiment are the same as those of the fuel cell vehicle 500 of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  The support frame 150a of the second embodiment is different from the support frame 150 of the first embodiment in that it includes an upper surface wall 151a and a lower surface wall 152a instead of the upper surface wall 151 and the lower surface wall 152. Since the other structure in the support frame 150a is the same as the support frame 150, the same code | symbol is attached | subjected to the same component and the detailed description is abbreviate | omitted.

  Instead of the through hole 155, a through hole 155a is formed in the upper surface wall portion 151a. A thread is formed on the inner peripheral surface of the through hole 155a. The lower wall portion 152a is different from the lower wall portion 152 of the first embodiment in that a through hole 156a is provided instead of the through hole 156. The through hole 156a has a small diameter and is slightly larger than a diameter of a shaft portion 311a of a bolt 310a described later.

  The mounting mechanism 490a of the second embodiment is the first implementation in that the bolt 310a is provided instead of the bolt 310, the nut 320a is provided instead of the nut 320, and the connecting collar member 450 is omitted. Different from the mounting mechanism 490 of the form. Since the other structure in the attachment mechanism 490a of 2nd Embodiment is the same as the attachment mechanism 490 of 1st Embodiment, the same code | symbol is attached | subjected to the same component and the detailed description is abbreviate | omitted.

  The bolt 310 a is different from the bolt 310 of the first embodiment in that it includes a shaft portion 311 a instead of the shaft portion 311, and other configurations are the same as the bolt 310. The shaft portion 311a is longer than the shaft portion 311 of the first embodiment, and the tip thereof is exposed to the outside of the support frame 150a (above the upper surface wall portion 151a).

  The nut 320a has a point where the vicinity of the screw hole on the lower surface does not protrude, a point where the diameter of the upper end (rear end 322) is larger than the diameter of the lower end, and the outer peripheral surface of the rear end 322 Are exposed to the outside of the support frame 150a, and an inner peripheral surface of the rear end 322 is formed with a screw thread 323 that is screwed with a screw thread formed in the through hole 155a of the support frame 150a. Unlike the nut 320 of the first embodiment, other configurations are the same as the nut 320. The bottom surface (tip surface) of the nut 320a is in contact with the bottom wall portion 152a.

  In the attachment mechanism 490a having such a structure, the rigidity of the connection portion CP2 is higher than the rigidity of the rear mount bracket 420, similarly to the connection portion CP1 of the first embodiment. This is because when an external force is applied to the connecting portion CP2, the force can be transmitted to the upper surface wall portion 151a and the lower surface wall portion 152a. Specifically, as in the first embodiment, when a downward external force is applied to the rear mount bracket 420, first, the downward force is transmitted to the bolt 310a that is in contact with the rear mount bracket 420, and the applied force. A part of is transmitted to the nut 320a screwed with the bolt 310a. A part of the force transmitted to the nut 320a is transmitted to the lower surface wall 152a in contact with the nut 320a and at the same time to the upper surface wall 151a screwed with the nut 320a. Thus, the downward force transmitted to the connection portion CP2 is distributed to the upper surface wall portion 151a and the lower surface wall portion 152a by the mounting mechanism 490a. Will occur. For this reason, as in the first embodiment, even when the tank 20 is detached from the fixed member due to the impact at the time of collision and moved forward by the inertial force, the collision between the fuel cell module 100 and the tank 20 is suppressed. The

  The fuel cell vehicle according to the second embodiment described above has the same effects as the fuel cell vehicle 500 according to the first embodiment.

C. Third embodiment:
FIG. 9 is an enlarged cross-sectional view showing the vicinity of the attachment mechanism 490b of the third embodiment. In FIG. 9, the cross section in the same position as FIG. 6 of 1st Embodiment is shown. The fuel cell vehicle according to the third embodiment is different from the fuel cell vehicle according to the second embodiment in that a support frame 150b is provided instead of the support frame 150a and an attachment mechanism 490b is provided instead of the attachment mechanism 490a. Since other configurations in the fuel cell vehicle of the third embodiment are the same as those of the fuel cell vehicle of the second embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  The support frame 150b of the third embodiment is different from the support frame 150a of the second embodiment in that it includes the upper surface wall 151 of the first embodiment instead of the upper surface wall 151a. Since the other structure in the support frame 150b of 3rd Embodiment is the same as the support frame 150a of 2nd Embodiment, the same code | symbol is attached | subjected to the same component and the detailed description is abbreviate | omitted.

  The attachment mechanism 490b of the third embodiment differs from the attachment mechanism 490a of the second embodiment in that a nut 320b is provided instead of the nut 320a and a welded portion 460 is additionally provided. Since the other structure in the attachment mechanism 490b of 3rd Embodiment is the same as the attachment mechanism 490a of 2nd Embodiment, the same code | symbol is attached | subjected to the same component and the detailed description is abbreviate | omitted.

  The nut 320b differs from the nut 320a of the second embodiment in that it includes a rear end 322a instead of the rear end 322, and the other configuration is the same as the nut 320a of the second embodiment. Therefore, the lower surface (front end surface) of the nut 320b is in contact with the lower surface wall 152a. The rear end 322a is not screwed with the upper surface wall 151, and is not in contact with the upper surface wall 151, and a predetermined gap g is formed between the upper surface wall 151 and the rear end 322a. Different from the rear end 322 of the second embodiment.

  The welded portion 460 is disposed so as to be in contact with and surround the outer diameter direction end portion of the rear end portion 322a, and is in contact with the upper surface of the upper surface wall portion 151. The welded portion 460 joins the rear end portion 322a and the upper surface wall portion 151 in a state where the gap g is generated. The welded portion 460 is configured such that a member different from the nut 320b and the upper surface wall portion 151 is disposed in the vicinity of the outer diameter direction end portion of the rear end portion 322a, and the member is laser welded to the upper surface wall portion 151 and the rear end portion 322a, respectively. May be formed. Further, for example, at least one of the rear end 322a and the upper surface wall 151 may be melted by irradiating with laser light and bonded to the other.

  In the attachment mechanism 490b having such a structure, the rigidity of the connection portion CP3 is higher than the rigidity of the rear mount bracket 420, similarly to the connection portion CP1 of the first embodiment. This is because when an external force is applied to the connecting portion CP3, the force can be transmitted to the upper surface wall portion 151 and the lower surface wall portion 152a. Specifically, as in the first and second embodiments, when a downward external force is applied to the rear mount bracket 420, first, a downward force is applied to the bolt 310a in contact with the rear mount bracket 420. Is transmitted, and a part of the force is transmitted to the nut 320b screwed with the bolt 310a. A part of the force transmitted to the nut 320b is transmitted to the lower surface wall 152a in contact with the nut 320b and at the same time to the upper surface wall 151 through the welded portion 460 in contact with the nut 320b. . Thus, the downward force transmitted to the connection portion CP3 is distributed to the upper surface wall portion 151 and the lower surface wall portion 152a by the mounting mechanism 490b, so that the rear mount bracket 420 is broken before the plastic deformation of the connection portion CP3 occurs. Will occur. Therefore, as in the first embodiment and the second embodiment, even when the tank 20 is detached from the fixed member due to an impact at the time of collision and moved forward by an inertial force, the fuel cell module and the tank 20 Collisions are suppressed.

  The fuel cell vehicle according to the third embodiment described above has the same effects as the fuel cell vehicle 500 according to the first embodiment and the fuel cell vehicle according to the second embodiment.

D. Variation:
D1. Modification 1:
In each embodiment, the fuel cell module 100 is fixed to the suspension member 550 via the front mount bracket 410, the rear mount bracket 420, the front mount member 430, and the rear mount member 440, but is not limited to the suspension member 550. Further, it may be fixed to any member (member) constituting the body frame. For example, the fuel cell module 100 may be indirectly fixed to the side member or the cross member.

D2. Modification 2:
In each embodiment, the tank storage chamber 530 extends in the vehicle length direction, but the present invention is not limited to this. It may be formed extending in the vehicle width direction LH. In addition, the tank storage chamber 530 may be configured as a space extending in both the vehicle length direction and the vehicle width direction LH. Further, the tank 20 to be stored may be stored in any direction in the tank storage chamber 530.

D3. Modification 3:
In each embodiment, the attachment mechanisms 490, 490a, 490b are configured to be in contact with the upper surface wall portions 151, 151a and the lower surface wall portions 152, 152a, so that the rigidity of the connection portions CP1, CP2, CP3 is reduced. Although the rigidity is higher than the rigidity of the mounting bracket 420, the present invention is not limited to this. For example, the connection portion CP1 may be formed by a method in which the lower wall portions 152, 152a are formed of a material having higher rigidity than the upper wall portions 151, 151a, a method in which a large number of support columns 153 are provided in the vicinity of the through holes 156, 156a, and the like. , CP2 and CP3 may be higher than the rigidity of the rear mount bracket 420.

D4. Modification 4:
In each embodiment, the support frames 150, 150a, and 150b have two wall portions (the upper surface wall portions 151 and 151a and the lower surface wall portions 152 and 152a) in the thickness direction TD. You may have a wall part. Even in such a configuration, the attachment mechanisms 490, 490a, 490b are arranged so as to be in contact with two or more of the plurality of wall portions arranged in the thickness direction TD, whereby the connection portions CP1, CP2, The rigidity of CP3 can be made higher than the rigidity of the rear mount bracket 420.

D5. Modification 5:
The configuration of the fuel cell vehicle 500 in each embodiment is merely an example, and various changes can be made. For example, the number of attachment mechanisms 490, 490a, 490b is not limited to four and may be any number. The case 130 may be omitted from the fuel cell module 100. In addition to the motor M, an internal combustion engine such as a gasoline engine may be provided as a power source. The fuel cell module 100 does not have to be inclined downward toward the tank 20 in the vehicle length direction. For example, the fuel cell module 100 may be horizontally arranged.

  The present invention is not limited to the above-described embodiments and modifications, and can be realized with various configurations without departing from the spirit of the present invention. For example, the technical features in the embodiments and the modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 11 ... Single cell 20 ... Tank 21 ... Fuel gas supply path 22 ... Fuel gas circulation path 23 ... Fuel gas discharge path 24 ... Shut-off valve 25 ... Injector 26 ... Exhaust drain valve 27 ... Circulation pump 29 ... Gas-liquid separator 30 ... Air Compressor 31 ... Oxidant gas supply path 32 ... Oxidant gas discharge path 33 ... Three-way valve 34 ... Pressure regulating valve 35 ... Bypass flow path 100 ... Fuel cell module 101 ... Fuel cell stack 102F, 102R ... Insulating plates 103F, 103R ... Collection Electrical plate 110, 120 ... End plate 130 ... Case 131 ... Fixed part 132 ... Gutter part 150, 150a, 150b ... Support frame 151, 151a ... Upper surface wall part 152, 152a ... Lower surface wall part 153 ... Post part 154 ... Internal space 155 , 155a ... through hole 156, 156a ... through hole 159 ... through hole 160 ... screw 2 DESCRIPTION OF SYMBOLS 0 ... Fuel cell system 210 ... DC-DC converter 310, 310a ... Bolt 311, 311a ... Shaft part 320, 320a, 320b ... Nut 321 ... Overlapping part 322, 322a ... Rear end part 323 ... Screw thread 410 ... Front mount bracket 420 ... rear mount bracket 421 ... first pedestal part 422 ... second pedestal part 423 ... inclined part 425 ... through hole 430 ... front mount member 440 ... rear mount member 450 ... connecting collar member 451 ... lid part 452 ... cylindrical part 460 ... welding 490, 490a, 490b ... mounting mechanism 500 ... fuel cell vehicle 510 ... passenger compartment 520 ... fuel cell housing chamber 530 ... tank housing chamber 550 ... suspension member 810 ... bolt 820 ... nut 890 ... mounting mechanism CP1, CP2, CP3, CP10 ... connection Part F ... External force FD ... Front direction FW ... Front wheel G ... Vertical downward LH ... Vehicle width direction M ... Motor RD ... Rear direction RW ... Rear wheel SD ... Lamination direction TD ... Direction g ... Gap

Claims (1)

A fuel cell vehicle,
A fuel cell module including a fuel cell stack;
A tank for storing gas supplied to the fuel cell stack;
A fuel cell housing chamber for housing the fuel cell module;
A tank storage chamber that is formed on the rear side in the vehicle length direction of the fuel cell vehicle with respect to the fuel cell storage chamber under the floor of the fuel cell vehicle, and stores the tank;
A vehicle body frame in which a part of the fuel cell housing chamber is disposed;
A fixing member connected to the fuel cell module and fixing the fuel cell module to the vehicle body frame;
With
The rigidity of the connecting portion between the fuel cell module and the fixing member is higher than the rigidity of the fixing member.
Fuel cell vehicle.

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