JPH05201356A - Car body structure of electric automobile - Google Patents

Abstract

(57) [Summary] [Structure] In a vehicle body structure of an electric vehicle, a floor opening surrounded by a cross member 22 at the rear ends of the left and right floor frames 18, left and right rear frames, and a cross member 23 therebetween. A pair of left and right box lower frames that fix the battery storage box 26 in the space 25 and linearly extend between the front and rear cross members 22 and 23 behind the floor frame 18 to support the lower surface of the battery storage box 26. Join 28. [Effect] It is possible to improve the holding strength of the battery 3 against a vertical load, improve the frame coupling efficiency under the floor, and improve the body rigidity against bending.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure of an electric vehicle, and more particularly to a structure of a battery mounting portion for driving the electric vehicle.

[0002]

2. Description of the Related Art As a structure for mounting a driving battery in an electric vehicle, a structure in which a battery is housed in a frame space under a load carrier is known from Japanese Patent Publication No. 51-27047. As a structure for dropping and mounting the battery in the rear part of the floor, for example, as shown in FIG. 16, an opening 103 is formed in the rear floor 102 behind the front floor 101, and a box-shaped part is formed in the opening 103. Connect the battery setting base 104,
It is conceivable to house the battery 111 therein.
In addition, as shown in FIG. 17, it is conceivable to extend the front floor 101 rearward and provide a partition by the bulkhead 105 or the like on the front side of the battery 111 mounted on the extension portion. The structure is JP-A-60
It is also known from JP-A-89063.

[0003]

However, as shown in the figure, in the structure in which the battery mounted on the rear portion of the floor is held only by the panel surface, the strength and rigidity of the battery mounting portion cannot be said to be sufficient, and the strength and rigidity are not sufficient. Improvement is desired.

Therefore, an object of the present invention is to provide a vehicle body structure in which the battery mounting portion is excellent in strength and rigidity in an electric vehicle in which a driving battery is dropped and mounted on the rear portion of the floor.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a pair of left and right floor frames extending in the front-rear direction under a floor, a cross member extending in the left-right direction joined to its rear ends, and joined to the left and right sides thereof. And a pair of rear frames extending rearward, and a body structure of an electric vehicle having a cross member extending in the left-right direction installed between them.
An opening for arranging a battery for driving an electric vehicle is formed in the floor portion surrounded by the rear frame and both cross members behind the floor frame, and a battery storage box is fixed in the opening. A pair of left and right box lower frames that linearly extend rearward of the floor frame are joined between the cross members while supporting a lower surface of the battery storage box.

[0006]

Function: By passing the box lower frame under the battery storage box, the holding strength against the vertical load of the battery is improved, and further, between the cross member at the rear end of the floor frame and the cross member between the rear frames. ,
By connecting with the box lower frame on the floor frame extension, the frame connection efficiency under the floor is improved, and in particular, the rigidity of the body against bending is improved.
Also, by passing the box lower frame back and forth,
Since the frame itself is less susceptible to chipping damage, it has a structure that is resistant to rust.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 10 showing an example of an electric vehicle to which the present invention is applied, 1 is a drive electric motor, 2 is a motor control unit, 3 is a drive battery, 4 is a battery control unit, 5 is a battery charger,
6 is a DC / DC converter, 7 is a spare tire, 8 is a jack, 9 is a steering wheel, 10 is a front seat, 11 is a front wheel, 12 is a rear wheel, 13 is a front floor, 14 is a rear floor, 15 is a rear panel, 16 is a A front side frame, 17 is a side sill, 18 is a front floor frame, and 19 is a rear frame. In the embodiment described below, in a two-door passenger vehicle, a large-capacity battery 3 supplied to an electric motor 1 mounted on the front part of the vehicle body is mounted on a rear floor 14 behind the front seat 10 installed on the front floor 13 thereof. Then, a front-wheel drive electric vehicle is configured.

As shown in FIG. 10, the vehicle body frame includes front side frames 16, side sills 17, 17, front floor frames 18, 18, rear frames 19, 19.
It is composed of. In the figure, 21 is a side sill 17 or 1.
7 and a front floor cross member 22 having a box-shaped cross-section, which is installed between the intermediate portions of the front floor frames 18 and 18, is installed between the rear portions of the side sills 17 and 17, and is attached to the rear ends of the front floor frames 18 and 18. Joined box-shaped middle floor cross member, 23
Is a rear floor cross member having a box-shaped cross section which is provided between the rear frames 19 and 19 near the rear part thereof, and 24 is a gusset provided between the rear end of the side sill 17 and the side part of the rear frame 18. Here, in the case where an internal combustion engine is installed, the front half of the rear floor 14 is formed high with a step, and a rear seat is installed on the upper surface thereof.
4 A fuel tank is arranged between the left and right rear frames 19, 19 below the front half and between the middle floor cross member 22 and the rear floor cross member 24 before and after that, but in the case of the electric vehicle of the embodiment, Using this space, the battery 3 is mounted below the front half of the rear floor 14 so as to be dropped.

That is, an opening 25 is formed in the front half of the rear floor 14 between the rear frames 19 and 19 and between the middle floor cross member 22 and the rear floor cross member 24. In the opening 25, the battery storage box 2 is formed.
A box-shaped battery setting base 27 as shown in FIG. 11, which constitutes the lower half of the No. 6, is dropped and the entire circumference thereof is welded to the opening 25. A pair of box lower frames 2 each having a box-shaped cross section extending linearly behind the left and right front floor frames 18, 18, respectively.
8 and 28 are welded and installed between the middle floor cross member 22 and the rear floor cross member 23, and the lower surface of the battery setting base 27 is welded and bonded to the upper surfaces of the box lower frames 28 and 28.

As shown in FIG. 12, the upper half portion of the battery storage box 26 includes left and right battery side bulkheads 29, 29 and a front battery front bulkhead 3.
1. The rear battery rear bulkhead 32 is provided. The battery side bulkheads 29, 29 are flange-welded to the left and right above the upper part of the battery setting base 27. The battery front bulkhead 31 is welded at both ends to the front pillar portions 34, 34 at the front portions of the left and right rear inner panels 33, 33, and has a lower surface on the front end portion of the rear floor 14 that forms a box section inside the middle portion. It is located above the floor cross member 22 and welded. The lower surface of the battery rear bulkhead 32 is flange-welded to the upper rear of the upper portion of the battery setting base 27, and both ends are welded to the damper base portions 35, 35 on the left and right of the rear floor 14. Then, the front and rear ends of the battery side bulkheads 29, 29 are welded to the battery front bulkhead 31 and the battery rear bulkhead 32.

In this way, the space of the front half of the rear floor 14 is divided into three parts, that is, the central battery storage box 26 and the chambers on the left and right thereof, which are continuous between upper left and right ends of the battery front bulkhead 31 and the battery rear bulkhead 32. The side supports 36, 36 are attached to the rear inner panel 33,
Welded to 33. And the battery storage box 2
The battery 3 is housed in the interior 6, and the battery control unit 4 is housed in the room on one side, and the DC is installed in the room on the other side where the battery charger 5 is located.
The / DC converter 6 is housed. Here, screw holes are formed in the upper surfaces of the battery side bulkheads 29, 29, the battery front bulkhead 31, the battery rear bulkhead 32, and the side supports 36, 36.
Central battery cover 37 and left and right side covers 3
8, 38 are adapted to be screwed. 39 is a battery set plate.

Further, the battery front bulkhead 31
As shown in FIG. 13, a battery front cross member 41 is provided in the. That is, the battery front cross member 41 having a box-shaped cross section is welded and joined to the rear surface of the battery front bulkhead 31, and both ends of the battery front cross member 41 are welded and joined to the front pillar portions 34, 34. Here, in the front pillar portion 34, a gusset 42 that corresponds to the extension of the battery front cross member 41 is provided, 43 is a pillar stiffener, 44 is a pillar outer panel, and 45 is a window for incorporating a seat belt retractor. Part, 46
Is a window for mounting the controllers.

Further, the battery front bulkhead 31
A gate-shaped protector pipe 47 is provided on the front surface of the with a screw to prevent the luggage in the rear luggage compartment from jumping out. A fuel tank 48 for a heater is arranged between the box lower frames 28, 28. Since the battery mounting structure of the electric vehicle having the above-described configuration is adopted, that is, as shown in an enlarged view in FIGS. 14 and 15, first, the box below the battery setting base 27 that constitutes the lower half of the battery storage box 26 is formed. Lower frame 2
Since it passes through No. 8 and 28, it is possible to sufficiently secure the holding strength against the vertical load of the battery 3. Moreover, this box lower frame 28, 28 is the front floor frame 1
Since the middle floor cross member 22 at the rear end of the 8 and 18 and the rear floor cross member 23 between the rear frames 19 and 19 are connected on the extension of the front floor frames 18 and 18, the front floor 13 and the rear floor. It is possible to increase the frame coupling efficiency of the lower part 14 and especially to secure high body rigidity against bending.

The box lower frames 28, 28
Since it goes through the front and back, it is less susceptible to chipping damage to the frame itself, so it has a structure that is also resistant to rust. In addition, the box lower frame 28, 2
By disposing the fuel tank 48 for the heater between the eight fuel cells, protection of the fuel tank 48 for the heater can be expected. Further, the middle floor cross member 22 below the front part of the rear floor 14 and the battery front bulkhead 31 above it.
By the battery front cross member 41 provided on the rear surface and installed between the center pillar portions 34, 34,
Sufficient strength can be secured in front of the battery 3, and particularly high body rigidity against torsion can be secured.

The rear of the battery mounting portion having the above structure is a spare tire mounting portion. That is, on the rear half of the rear floor 14, the left and right spare tire side bulkheads 51, 51, which coincide with the extension of the battery side bulkheads 29, 29, are attached to the front battery rear bulkhead 32, the upper surface of the rear floor 14, and the rear rear panel. Welded to 15. Further, the side support 52 is welded and joined between the spare tire side bulkhead 51 and the damper base portion 35, and the rear support 5 is provided between the spare tire side bulkhead 51 and the rear panel 15.
3 are welded to each other to form a rear inner panel 33 and a rear panel 1.
The corner support 54 extending over 5 is welded and joined.

A spare tire anchor bracket 55 is erected by welding at the center on the rear half of the rear floor 14. This spare tire anchor bracket 5
5 has a space portion penetrating in the left-right direction and has an anchor nut 56 on the upper surface inclined rearward and downward. Further, on the rear surface of the battery rear bulkhead 32, a spare tire setting cross member 57 having a triangular cross section formed by a joined body of plates whose upper surface is inclined rearward is welded. Both ends of the spare tire setting cross member 57 are welded to the left and right damper base portions 35, 35. The spare tire 7 is mounted on the front side of the spare tire setting cross member 57 on the rear downward slope, and the spare tire anchor bracket 5 is mounted.
The wheel center hole placed on the rearwardly inclined surface of No. 5 is pressed by the anchor plate 58, and the anchor bolt 5
It is fixed by screwing 9 into the anchor nut 56.

The spare tire anchor bracket 5
A jack 8 is housed in a space passing through in the left-right direction of 5, and the jack 8 is fixed in a state of being sandwiched between the spare tire anchor bracket 55 and the rear floor 14. The spare tire mounting portion described above is covered by, for example, a folding spare tire lid 61 mounted on the spare tire side bulkheads 51, 51. The spare tire lid 61, the battery cover 37, and the side cover 38 are covered. , 38 and
A flat luggage compartment floor surface is formed.

Since the spare tire mounting structure of the electric vehicle having the above-described structure is adopted, that is, the spare tire 7 is set in the forwardly inclined state, the front-rear dimension of the spare tire mounting space behind the battery storage box 26 can be reduced. At the same time, since the upper end of the spare tire 7 is set lower than the upper surface of the battery storage box 26, the floor of the luggage compartment can be flattened. In addition, a spare tire setting cross member 57 having a triangular cross section formed by a joined body of the plates provided on the rear surface of the battery rear bulkhead 32 and having the upper surface on which the front side of the spare tire 7 is placed is inclined rearward and downward, and the left and right damper base parts 35. , 35, it is possible to secure sufficient strength in the rear of the battery 3, and particularly to secure high body rigidity against torsion.

The spare tire anchor bracket 5
Since the jack 8 is stored inside the spare tire 5, the dead space in the spare tire anchor bracket, which has not been used conventionally, can be effectively utilized. It is needless to say that the specific structure of the details can be appropriately changed other than the embodiment.

[0020]

As described above, according to the vehicle body structure of the electric vehicle of the present invention, the inside of the floor opening surrounded by the cross members at the rear ends of the left and right floor frames, the left and right rear frames, and the cross members between them. Since the battery storage box is fixed to the front and rear cross members, a pair of left and right box lower frames that linearly extend to the rear of the floor frame and support the lower surface of the battery storage box are joined between the cross members. By passing the box lower frame through the box, the holding strength against the vertical load of the battery can be improved, and the box lower on the floor frame extension is installed between the cross member at the rear end of the floor frame and the cross member between the rear frames. By connecting with a frame, the frame connection efficiency under the floor is improved, especially when bending It is possible to achieve improved body rigidity against. Further, by passing the box lower frame back and forth, chipping damage to the frame itself is less likely to occur, so that there is also an advantage that the structure is resistant to rust.

[Brief description of drawings]

FIG. 1 is a schematic perspective side view showing an example of an electric vehicle to which the present invention is applied.

FIG. 2 is a schematic plan view showing a floor surface of the same.

FIG. 3 is a vertical cross-sectional side view showing an enlarged battery storage portion and spare tire storage portion.

FIG. 4 is a vertical sectional front view of a battery storage portion.

FIG. 5 is a schematic plan view of a battery storage part and a spare tire storage part.

FIG. 6 is a perspective view of the interior of the vehicle in the rear portion from the front floor surface before assembly of a bulkhead and the like.

FIG. 7 is a perspective view of the bulkhead and the like after assembling.

FIG. 8 is a perspective view showing a state in which a battery and the like are also stored.

FIG. 9 is a perspective view after assembling the protector pipe and the like.

FIG. 10 is a schematic plan view showing the entire body frame.

FIG. 11 is an exploded perspective view of a battery setting base and its lower frame.

FIG. 12 is an exploded perspective view of the battery setting base and its bulkhead.

FIG. 13 is an exploded perspective view of a bulkhead, a cross member and the like in front of it.

FIG. 14 is a vertical cross-sectional side view showing the main structure according to the present invention.

[Fig. 15] Similarly, a vertical sectional front view

FIG. 16 is a vertical sectional side view showing an example of a conventional structure.

FIG. 17 is a vertical sectional side view showing another example of the conventional structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric motor, 3 ... Battery, 13 ... Front floor, 14 ... Rear floor, 18 ... Front floor frame, 19 ... Rear frame, 22 ... Middle floor cross member, 23 ... Rear floor cross member, 25 ... Opening part,
26 ... Battery storage box, 27 ... Battery setting base, 28 ... Box lower frame, 29 ... Battery side bulkhead, 31 ... Battery front bulkhead, 32 ... Battery rear bulkhead.

Claims (1)

[Claims] 1. A pair of left and right floor frames extending in the front-rear direction, a cross member extending in the left-right direction joined to the rear ends of the floor, a pair of rear frames extending in the left-right direction, which are joined to the left and right, and a left-right direction erected therebetween. In a vehicle body structure in which a cross member extending to the
An opening for arranging a battery for driving an electric vehicle is formed in the floor portion surrounded by the rear frame and both cross members behind the floor frame, and a battery storage box is fixed in the opening. A vehicle body structure for an electric vehicle, comprising: a pair of left and right box lower frames, which linearly extend rearward of the floor frame, supported between the cross members while supporting a lower surface of the battery storage box.