JP7052636B2 - Floor structure of electric vehicle - Google Patents

Description

The present invention relates to a floor structure of an electric vehicle.

An electric vehicle is equipped with a rotary electric machine that is a drive source and a battery that supplies electric power to the rotary electric machine. For example, in Patent Document 1, as illustrated in FIG. 4, the battery pack 102 is suspended and supported under the floor panel 100, which is the floor plate of the cabin (vehicle compartment).

For example, in order to prevent the cabin space from collapsing in the vehicle length direction in the event of a frontal collision (front collision) of the vehicle, a reinforcing member is provided around the floor panel 100. For example, a tunnel cover lean forcement 106 (hereinafter, appropriately referred to as a tunnel cover R / F) is provided so as to cover the upper part (tunnel roof) of the floor tunnel 104.

Further, in the lower part of the floor tunnel 104, a tunnel side lean force 108 (hereinafter, appropriately referred to as a tunnel side R / F) extending along the side walls 104A and 104A of the floor tunnel 104 is provided. Both the tunnel cover R / F106 and the tunnel side R / F108 are extended in the vehicle length direction.

A pair of tunnel side R / F 108s are provided on both sides of the floor tunnel 104 in the vehicle width direction. In Patent Document 1, as illustrated in FIG. 4, tunnel side R / F 108, 108 are provided from the lower surface of the lower end portion of the floor tunnel 104 to the lower surface of the floor panel 100 on the outer side in the vehicle width direction. Further, in order to form a closed cross section together with the floor panel 100, the tunnel sides R / F 108 and 108 are formed in a substantially hat-shaped cross section in which the upper part in the vehicle height direction is open.

Japanese Unexamined Patent Publication No. 2013-154880

By the way, when the tunnel side R / F 108 is projected downward from the lower surface of the floor panel 100, the accommodation height of the battery pack 102 is reduced by the protrusion height H1 minutes. In addition, when the tunnel side R / F 108 has a shape that is opened upward in the vehicle height direction, water tends to collect inside, and the tunnel side R / F 108 may be corroded.

Therefore, the present invention provides a floor structure for an electric vehicle, which can expand the storage height of the battery pack under the floor as compared with the conventional case and can suppress the progress of corrosion of the tunnel side R / F as compared with the conventional case. The purpose is.

The present invention relates to a floor structure of an electric vehicle. The floor structure includes a floor panel, a battery pack, and a tunnel side R / F. The floor panel shall be provided with a pair of floor panels and a floor tunnel. The pair of floor panels are provided on both sides in the vehicle width direction to form the floor surface of the vehicle interior. The floor tunnel is connected to the inner end of the pair of floor panels in the vehicle width direction, and projects upward from the floor panels and extends in the vehicle length direction. The battery pack is housed below the floor panel. The tunnel side R / F is provided on both sides of the floor tunnel in the vehicle width direction and extends in the vehicle length direction. Further, the tunnel side R / F has a side end flange joined to the side wall of the floor tunnel, a lower end flange joined to the upper surface of the floor panel, and a vehicle width protruding upward from the lower end flange and from the side end flange. It is provided with a convex portion protruding outward in the direction.

According to the above configuration, since the tunnel side R / F is provided above the floor panel, the storage height of the battery pack is expanded as compared with the case where the tunnel side R / F is provided below the floor panel. Further, the water that has entered the inside of the tunnel side R / F can be discharged to the outside through the gap between the floor panel and the lower end flange, and the progress of corrosion of the tunnel side R / F can be suppressed more than before.

According to the present invention, the storage height of the battery pack under the floor can be expanded as compared with the conventional case, and the progress of corrosion of the tunnel side R / F can be suppressed as compared with the conventional case.

It is a perspective view which illustrates the floor structure of the electric vehicle which concerns on this embodiment. It is an exploded perspective view which illustrates the floor structure of the electric vehicle which concerns on this embodiment. It is a back sectional view illustrating the cross section AA of FIG. It is a back sectional view which illustrates the floor structure of the conventional electric vehicle.

FIG. 1 illustrates the floor structure of the electric vehicle according to the present embodiment. In FIGS. 1 to 3, the vehicle length direction (vehicle front-rear direction) is indicated by the axis represented by the symbol FR, the vehicle width direction is indicated by the axis represented by the symbol RW, and the vertical direction is indicated by the symbol UP. Axis indicates. The symbol FR is an abbreviation for Front, and the long axis FR has a positive direction in the front direction of the vehicle. The symbol RW is an abbreviation for Right Left, and the vehicle width axis RW has the right width direction as the positive direction. Further, the vehicle height axis UP has an upward direction as a positive direction.

As shown in FIG. 1, these vehicle length axes (FR axes), vehicle width axes (RW axes), and vehicle height axes (UP axes) are orthogonal to each other. Hereinafter, when the floor structure of the electric vehicle according to the present embodiment will be described, these three axes will be used as a reference as appropriate. For example, the "front end" refers to the end of any member on the positive direction of the vehicle length axis, and the "rear end" refers to the end of any member on the negative side of the vehicle length axis. "Inside the width" refers to the inside in the width direction of the vehicle relative to the vehicle width axis, and "outside the width" refers to the outside in the width direction of the vehicle relatively along the vehicle width axis. Further, "upper side" relatively refers to the positive direction side of the vehicle height axis, and "lower side" relatively refers to the negative direction side of the vehicle height axis.

FIG. 1 illustrates the floor structure of the electric vehicle according to the present embodiment. Further, FIG. 2 illustrates an exploded perspective view of the floor structure of the electric vehicle according to the present embodiment when the battery pack 20 is removed from the floor of the passenger compartment (cabin).

The floor structure of the electric vehicle according to the present embodiment includes a floor panel 10, a battery pack 20, a tunnel cover R / F30 (tunnel cover lean force), and a tunnel side R / F40 (tunnel side lean force). It is composed.

The battery pack 20 is housed below the floor panel 10. With reference to FIG. 2, the upper surface of the battery pack 20 is formed along a floor shape facing it. For example, the front surface of the upper surface of the case 21 of the battery pack 20 in the vehicle length direction is raised upward so as to correspond to the floor tunnel 11.

The battery pack 20 includes a case 21 and a battery stack 22 housed in the case 21. Further, on the lower surface of the case 21, a plurality of outer pack cloths 27 are provided at predetermined intervals in the vehicle length direction.

A plurality of battery stacks 22 are housed in the case 21. A plurality of battery cells 23 are stacked on one battery stack 22. The battery cell 23 is composed of, for example, a nickel hydrogen secondary battery, a lithium ion secondary battery, an all-solid-state battery, and the like.

The outer pack 27 is a skeleton member that protects the battery pack 20. The outer pack cloth 27 is provided outside the battery pack 20, and both ends in the vehicle width direction thereof are formed so as to project outward from both ends in the vehicle width direction of the case 21.

The battery pack 20 is suspended and supported below the floor panel 10 by using the outer pack cloth 27. For example, the floor panel 10 is provided with a front side member 50 which is a skeleton member. The front side member 50 includes a front side member upper 50A and a front side member lower 50B so as to sandwich the floor panel 10 vertically.

The front side member upper 50A and the front side member lower 50B each have a cross-sectional hat shape, the front side member upper 50A is arranged so that the lower side is opened, and the front side member lower 50B is arranged so that the upper side is opened. To. Further, a weld nut 26 (see FIG. 2) is provided on the bottom wall of the front side member lower 50B. Further, the bottom wall is provided with an opening 50B1 coaxial with the screw hole of the weld nut 26.

On the other hand, openings 28 penetrating in the vehicle height direction are provided at both ends of the pack outer cloth 27 in the vehicle width direction. With reference to FIGS. 1 and 2, a bolt 24 is inserted into the opening 28 of the outer cross 27 of the pack, and the bolt 24 is further screwed into the weld nut 26 of the front side member lower 50B. As a result, the battery pack 20 is suspended and supported below the floor panel 10.

The floor panel 10 is a panel member constituting the floor plate of the vehicle interior. The front end of the floor panel 10 is connected to the lower end of the dash panel 51 constituting the front wall of the vehicle interior.

The floor panel 10 includes a floor tunnel 11 and a pair of floor panels 12, 12. The pair of floor panels 12, 12 are provided on both sides in the vehicle width direction to form the floor surface of the vehicle interior. For example, the pair of floor panels 12, 12 are horizontally extended to form the floors of the driver's seat (D seat) and the passenger's seat (P seat).

The floor tunnel 11 is provided at the center in the vehicle width direction. The floor tunnel 11 projects upward in the vehicle height direction from the floor panels 12 and 12 and extends in the vehicle length direction.

As illustrated in FIG. 3, the floor tunnel 11 is a member having a cross-section Π (pi) shape in which the lower part in the vehicle height direction is open in the rear cross-sectional view, and is a pair extending substantially in the vertical direction and facing in the vehicle width direction. The side walls 13 and 13 are connected to the upper ends of the pair of side walls 13 and 13, and an upper wall 14 extending in the vehicle width direction is provided. The lower ends of the pair of side walls 13 and 13 of the floor tunnel 11 are connected to the inner ends of the pair of floor panels 12 and 12 in the vehicle width direction.

For example, in an electric vehicle, the floor tunnel 11 is used as a reinforcing structure for a vehicle interior. The floor tunnel 11 extends from the front end of the vehicle interior to the rear in the vehicle length direction at the center in the vehicle width direction. Crushing can be suppressed.

For example, a high-rigidity device such as a rotary electric machine is mounted in a so-called engine compartment (motor compartment) in front of the passenger compartment. At the time of a front collision of the vehicle, these devices are pushed backward, that is, toward the passenger compartment. At this time, by arranging the reinforcing member around the floor tunnel 11, it is possible to suppress (push) the entry of the device into the vehicle interior.

With reference to FIGS. 1 to 3, a tunnel cover R / F30 is provided as a reinforcing member for covering the upper surface of the floor tunnel 11. The tunnel cover R / F30 is extended in the vehicle length direction together with the floor tunnel 11. As the tunnel cover R / F30, a steel plate having a higher rigidity than the panel material of the floor panel 10, such as a high-strength steel plate, is used.

Further, tunnel side R / F 40, 40 are provided as a reinforcing member covering the side surface of the floor tunnel 11. With reference to FIG. 3, the tunnel side R / F 40, 40 is arranged on the upper surface of the floor panel 10. By adopting such an arrangement, the space under the floor panel 10 is increased as compared with the case where the tunnel side R / F is arranged below the floor panel 10, and the battery pack 20 accommodated under the floor is accommodated. The height is expanded.

With reference to FIGS. 1 and 2, the tunnel side R / F 40, 40 are provided on both sides (both sides) of the floor tunnel 11 in the vehicle width direction, and along the side walls 13 and 13 of the floor tunnel 11, for example, a dash panel. It extends from 51 to the rear in the direction of the vehicle length. Further, similarly to the tunnel cover R / F30, as the tunnel side R / F40, 40, a steel plate having higher rigidity than the panel material of the floor panel 10, such as a high-strength steel plate, is used.

As illustrated in FIG. 3, the tunnel side R / F 40, 40 are each formed in a W shape in a rear sectional view. The tunnel side R / F 40, 40 each includes a side end flange 41, a lower end flange 42, a vertical wall 43, and a horizontal wall 44.

The side end flange 41 is joined to the side wall 13 of the floor tunnel 11 by welding or the like. In FIG. 3, the welded portion is indicated by a cross mark. Welding points are provided at predetermined intervals in the vehicle length direction.

Further, the side end flange 41 is also joined to the side wall 31 of the tunnel cover R / F30 by welding or the like. As a result, as illustrated in FIG. 3, the floor tunnel 11 is covered over the entire surface by the tunnel cover R / F30 and the tunnel side R / F40, 40 which are reinforcing members. As a result, the rigidity around the floor tunnel 11 is improved as compared with the case where a part of the floor tunnel 11 is covered with the reinforcing member.

The lower end flange 42 of the tunnel side R / F 40, 40 is joined to the upper surface of the floor panel 12 of the floor panel 10 by welding or the like. Welding points are provided at predetermined intervals in the vehicle length direction.

Further, the side wall 44 projects outward from the lower end of the side end flange 41 in the vehicle width direction. In addition, the vertical wall 43 projects upward in the vehicle height direction from the inner end of the lower end flange 42 in the vehicle width direction. The outer end of the horizontal wall 44 in the vehicle width direction and the upper end of the vertical wall 43 in the vehicle height direction are connected to each other.

The convex portion 45 is formed by the horizontal wall 44 and the vertical wall 43. The convex portion 45 has a shape that protrudes upward from the lower end flange 42 and protrudes outward from the side end flange 41 in the vehicle width direction. Further, a ridge line 46 is formed on the convex portion 45 as a boundary line between the horizontal wall 44 and the vertical wall 43. The ridge line 46 extends in the vehicle length direction along the floor tunnel 11.

Generally, when a load is input to a member, the load transmission path (load path) of the load is formed on a region of the member having high rigidity (most stretched against the load). When a load in the vehicle length direction is input around the floor tunnel 11 at the time of a front collision of the vehicle, the main load path is formed on the ridgeline of the reinforcing member around the floor tunnel 11 extending in the vehicle length direction. To. By forming such a ridge line 46 in the vehicle length direction by the convex portion 45, it is possible to form a load path that receives a load in the vehicle length direction on the tunnel side R / F 40, 40.

Here, by forming the convex portion 45, a space is created inside the convex portion 45. As shown by the broken line arrow in FIG. 3, water may enter this space. For example, referring to FIG. 1, water enters from the gap 32 (seam) between the joint point between the floor tunnel 11 and the tunnel cover R / F30, and continues along the upper surface of the floor tunnel 11 as it is, and the space 47 inside the convex portion 45 ( (See Fig. 3).

However, in the present embodiment, the lower end of the convex portion 45 is the lower end flange 42, and the gap between the lower end flange 42 and the floor panel 12, for example, a predetermined joint point and another joint point adjacent to the predetermined joint point in the vehicle length direction. Water can be discharged to the outside of the convex portion 45 through the gap formed between the floor panel 12 and the upper surface of the floor panel 12. As a result, the retention of water in the space 47 is suppressed, and the progress of corrosion of the tunnel side R / F 40, 40 can be suppressed.

Further, as described above, due to the structure, the water that has entered the space 47 is discharged as it is from the gap between the lower end flange 42 and the floor panel 12, so that a seal structure that prevents water from entering the space 47, for example, is provided on the side. It is not necessary to provide it between the end flange 41 and the side wall 13 of the floor tunnel 11.

10 floor panel, 11 floor tunnel, 12 floor panel, 13 floor tunnel side wall, 20 battery pack, 30 tunnel cover R / F, 31 tunnel cover R / F side wall, 32 gap, 40 tunnel side R / F, 41 Side end flange of tunnel side R / F, 42 lower end flange of tunnel side R / F, 43 vertical wall of tunnel side R / F, 44 side wall of tunnel side R / F, 45 convex part of tunnel side R / F, 46 The ridgeline.

Claims (1)

A pair of floor panels provided on both sides in the vehicle width direction and constituting the floor surface of the vehicle interior, and a pair of the floor surface panels connected to the inner end in the vehicle width direction and projected upward from the floor surface panel. A floor panel with a floor tunnel extending from the front end of the passenger compartment in the direction of the vehicle length,
A battery pack housed under the floor panel and
A tunnel cover R / F, which is a reinforcing member that covers the upper surface of the floor tunnel and extends in the vehicle length direction from the front end of the passenger compartment together with the floor tunnel.
The tunnel side R / F, which is a reinforcing member provided on both sides of the floor tunnel in the vehicle width direction and extending in the vehicle length direction from the front end of the vehicle interior,
It is a floor structure of an electric vehicle equipped with
The tunnel side R / F includes a side end flange joined to the side wall of the floor tunnel, a lower end flange joined to the upper surface of the floor panel, and the side end protruding upward from the lower end flange. Equipped with a convex portion protruding outward in the vehicle width direction from the flange ,
The side end of the tunnel cover R / F and the side end flange of the tunnel side R / F are joined.
Floor structure of electric vehicles.

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