JPH07187016A - Battery floor structure of electric automobile - Google Patents

Abstract

PURPOSE:To provide a battery floor structure whose bending deformation is little at the time of installing a battery on an automobile. CONSTITUTION:On both sides of a lower plate 8, a side frame is mounted. At the lower plate 8 where a front cross frame and a rear cross frame are mounted, a longitudinal rib 9 is formed along the front/rear direction, and the height of the longitudinal rib 9 becomes more as it approaches its central part. A lateral rib 14 is mounted in the automobile width direction, crossing the longitudinal rib 9. The storage part of a battery is formed by the longitudinal rib 9 and the lateral rib14. The lower plate 8 is constituted so as to be mounted onto an automobile body floor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery floor structure for an electric vehicle.

[0002]

2. Description of the Related Art As a battery floor of an electric vehicle,
For example, as shown in Japanese Patent Laid-Open No. 5-193367, there is one that is suspended on a side frame of a vehicle body. In this battery floor, a reinforcing material is arranged around the bottom of the box main body in the box main body in which a plurality of batteries are arranged to secure the rigidity of the whole.

[0003]

However, in the battery floor structure of the conventional electric vehicle described above, the reinforcing member is a plate-shaped member and can enhance the rigidity of the box body, but when the battery is mounted. In addition, it is vulnerable to the bending of the box body, especially the large lengthwise bending in the front-back direction, and in order to eliminate this, it is necessary to take measures such as increasing the thickness of the reinforcing material, etc. is there.

Therefore, the present invention provides a battery floor structure for an electric vehicle that is lightweight and has high rigidity.

[0005]

A battery floor structure for an electric vehicle attached to a lower portion of a vehicle body floor and accommodating a plurality of batteries, wherein a plurality of longitudinal bones and a vehicle width direction are provided along a longitudinal direction of the vehicle body. A battery storage portion is defined by a plurality of horizontal bones provided along the vertical bones, and the vertical bones are formed in a shape in which the central portion is higher than the front and rear ends.

[0006]

Function: The longitudinal bone in the front-rear direction, which is easily bent due to a large stress, has a shape in which the central portion is higher than the front-rear ends to enhance the flexural rigidity.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

2 and 3, reference numeral 1 indicates a vehicle body floor. This vehicle body floor 1 has a floor panel 2 and side sills 3 attached to the side edge portions of the floor panel 2. As shown in FIG. 2, the bottom surface of the floor panel 2 has a hat-shaped cross section along the longitudinal direction of the vehicle body. A side member 4 having a shape is attached, and as shown in FIG. 3, a front cross member 5 having a hat-shaped cross section is provided on each of a front portion and a rear portion of the floor panel 2.
And a rear cross member 6 are attached. In addition, FR
Indicates the front side.

A battery floor 7 is detachably attached to the side members 4 and 4 and the front cross member 5 and the rear cross member 6 of the vehicle body floor 1 thus constructed.

As shown in FIG. 1, the battery floor 7 has a lower plate 8 formed by pressing a steel plate material.

The lower plate 8 is formed such that both side edges and front and rear side edges of the bottom portion T gradually rise, and a plurality of vertical bones 9 are formed on the upper surface at predetermined intervals in the vehicle front-rear direction. The longitudinal bone 9 is formed on the base portion 10 which is one step higher than the bottom portion T, and is formed in a shape in which the central portion is higher than the front and rear ends as shown in FIG.

Side frames 11 are attached to both sides of the lower plate 8 as shown in FIG. 2, and a front cross frame 12 and a rear cross frame 13 are attached to front and rear sides of the lower plate 8 as shown in FIG. The lower plate 8 and the lower plate 8 are joined together to form a closed cross-section structure portion.

Then, as shown in FIGS.
A plurality of transverse ribs 14 that intersect with each other and form a closed cross-section structure portion in a direction along the vehicle width direction are attached at predetermined intervals. In addition, a relief portion 15 of the vertical bone 9 is formed in the horizontal bone 14,
The flange portions 14A are provided at both ends.

In this manner, the vertical bone 9 and the horizontal bone 14 form a compartment 17 for the battery 16, and the battery 16 is supported and mounted on the base portion 10 of the vertical bone 9. .

A lower end plate E is attached to the back side of the vertical frame 9 of the lower plate 8 to make the vertical frame 9 have a closed cross-section structure.

According to the structure of the above embodiment, the longitudinal bone 9 and the transverse bone 1
4, side frame 11, front cross frame 12
Since the closed cross-section structure portion is formed by the rear cross frame 13, the battery floor 7 that is lightweight and has high rigidity can be obtained.

In particular, in the front-back direction in which the length is large compared to the width dimension, the longitudinal bone 9 tends to flex and deform in the state where the battery 16 is mounted, but the longitudinal bone 9 is formed to have a high central portion in the longitudinal direction of the vehicle body. Therefore, the second moment of area is high and the bending rigidity is higher in the central portion, so that it is possible to prevent the vertical bone 9 from being flexibly deformed.

Since the lower plate 8 is formed so that both side edges thereof gradually rise, as shown in FIG. 2, when riding on the curb 18 (shown in FIG. 3), the lower plate 8 conforms to the shape of the bottom surface of the vehicle body. Can pass through.

Next, a second embodiment of the present invention will be described. As shown in FIG. 4, a battery floor 20 that can be attached to a vehicle body floor (not shown) has a panel member 22 attached to a lower side of a frame body 21.

The frame 21 is provided with longitudinal ribs 23 on both sides extending along the longitudinal direction of the vehicle body and three transverse ribs 24 connecting the longitudinal ribs 23 in the vehicle width direction, and diagonally rearward from both ends of the transverse rib 24 at the rear portion. The oblique ribs 25 facing toward are integrally press-molded, and each part is formed in a hat-shaped cross-sectional shape. A horizontal frame member 26 is connected to the front ends of the vertical bones 23 on both sides, and a horizontal frame member 27 is connected to the rear ends of the diagonal ribs 25.

The mounting portions of the transverse members 26, 27 are
The transverse member 26 will be described as an example with reference to FIGS.
At the front ends of the longitudinal ribs 23 on both sides, the inner wall 23A is cut to provide a flange portion 23B that faces inward, and the outer wall 23C also has a flange portion 23D that faces inward.

On the other hand, at the end of the transverse member 26, a rear side wall 26A is formed with a flange portion 26B facing rearward.

Then, as shown in FIG. 6, the flange portion 23D of the vertical frame 23 is joined to the front side wall 26C at the end of the horizontal frame member 26, and the flange portion 23B of the vertical frame 23 is connected to the horizontal frame member 2.
6 is joined to the rear side wall 26A, and the flange portion 26B of the transverse frame member 26 is joined to the outer side wall 23C of the vertical frame 23 by spot welding to connect them. In substantially the same manner, the horizontal frame member 27 and the oblique rib 25 are joined by spot welding.

Here, the horizontal frame 24 and the horizontal frame members 26,
Vertical bones 28 arranged in three rows in the front-rear direction of the vehicle body are provided between 27, and a storage portion 30 for a battery 29 is defined by the vertical bones, the horizontal bones 24, and the horizontal bone members 26, 27.

Each of the vertical ribs 28 is formed such that the central portion in the vehicle front-rear direction is higher than both end portions. FR indicates the front side of the vehicle body.

The horizontal frame members 26, 27, the horizontal frame 24, and the vertical frames 23, 28 have a flange portion F at their lower edges.

The flange portions F of the transverse members 26, 27, the transverse bones 24, and the longitudinal bones 23, 28 of the frame body 21 thus formed are attached to the panel material 22 and both sides of the panel material 22 are attached. The edges are spot welded by hemming as shown in FIG.

According to the structure of the above embodiment, since the vertical ribs 28 are formed so as to be higher toward the center of the vehicle body in the front-rear direction, the second moment of area becomes higher. Therefore, when the battery 29 is mounted on the floor of the vehicle body. The flexural deformation of the battery floor 20 can be minimized.

[0029]

As described above, according to the present invention, since the longitudinal bone is formed so as to have a high central portion in the longitudinal direction of the vehicle body, the longitudinal bone in the longitudinal direction of the vehicle body is relatively easy to bend when mounted on a vehicle equipped with a battery. Flexural rigidity can be increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a sectional view taken along the line BB of FIG.

FIG. 4 is an exploded perspective view of the second embodiment.

5 is an explanatory view of a joining state of the corners of FIG. 4.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is an enlarged view of a main part of FIG.

FIG. 8 is an explanatory cross-sectional view showing a bonding state with a panel material.

[Explanation of symbols]

 1 ... Body floor 9 ... Vertical bone 14 ... Horizontal bone 16 ... Battery 17 ... Storage part

Claims (1)

[Claims] 1. A battery floor structure for an electric vehicle, which is attached to a lower portion of a vehicle body floor and accommodates a plurality of batteries, wherein the battery floor structure is provided along a longitudinal direction of the vehicle body and a plurality of longitudinal bones provided along the vehicle width direction. A battery floor structure for an electric vehicle, characterized in that a battery storage portion is defined by the plurality of horizontal ribs formed, and the vertical bone is formed in a shape in which a central portion is higher than front and rear ends.