JP2000351328A - Battery mounting structure for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery mounting structure for an electric vehicle capable of mounting a battery on one side on the lower side of a vehicle body floor without impairing support stability. SOLUTION: Since a plurality of case skeleton parts 16 provided in the direction of vehicle width are connected across a side member 3 on the outdoor side and a cross member 4 on the capin side in a battery case 12, diffusion and burdening of battery load are satisfactorily done to increase support rigidity, even if the battery case 12 exists eccentrically on one side of a vehicle body floor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle, and more particularly, to a hybrid electric vehicle (hereinafter, referred to as a hybrid electric vehicle) in which an engine and a motor are used as driving sources to switch between engine driving and motor driving in accordance with vehicle operating conditions. (Hereinafter simply referred to as a hybrid vehicle).

[0002]

2. Description of the Related Art In an electric vehicle, a vehicle-mounted battery occupies a considerable weight and space. Therefore, conventionally, as disclosed in Japanese Patent Application Laid-Open No. 7-52835, for example,
A dedicated rigid-structured battery frame is connected and arranged on the front and rear skeleton portions on both lower sides of the vehicle body floor, and a plurality of batteries are mounted on the battery frame.

[0003]

In a hybrid vehicle, since the exhaust pipe of the engine is disposed below the vehicle body floor in the front-rear direction, the above structure cannot be applied to the hybrid vehicle as it is, and the If you try to mount the battery frame on the left and right sides of the vehicle floor,
The end of the battery frame on the center side in the vehicle width direction must be connected to the floor panel surface, and there is a possibility that reliable support of the battery frame becomes unstable.

Accordingly, the present invention provides a battery mounting structure for an electric vehicle in which a battery can be biased and mounted on one side below the vehicle body floor without any loss of support stability.

[0005]

According to the first aspect of the present invention, a battery case accommodating a battery is provided with a plurality of case frameworks extending in the vehicle width direction. The vehicle is characterized in that the outer end portion is connected to the front-rear skeleton portion of the vehicle body floor side, while the end portion of the case skeleton portion on the vehicle width direction center side is connected to the vehicle width direction skeleton portion of the vehicle body floor.

According to a second aspect of the present invention, the battery case and the case skeleton according to the first aspect are characterized in that the battery case and the case frame are bent into a substantially L-shaped cross section in which the center in the vehicle width direction rises.

According to a third aspect of the present invention, the front-rear skeletal portion and the vehicle width-direction skeletal portion of the vehicle body floor according to the second aspect are joined together, and these two skeletal portions and the case skeletal portion form a rectangular shape. It is characterized by having a frame structure.

[0008] In the invention of claim 4, claims 1 to 3 are provided.
Is a cross member joined across the front and rear skeleton portions on both sides of the vehicle body floor.

In the invention of claim 5, claims 1 to 4 are provided.
Is a side member joined to both sides of the lower surface of the floor panel.

In the invention of claim 6, claims 1 to 4 are provided.
Is a side sill joined to both ends of the floor panel.

According to the invention of claim 7, claims 1 to 6 are provided.
Is characterized in that a clamp belt is wrapped around the upper surface of the battery, and the battery is fastened and fixed to the bottom surface of the battery case by the clamp belt.

According to an eighth aspect of the present invention, the clamp belt according to the seventh aspect is connected to a case framework.

According to the ninth aspect of the present invention, the first to eighth aspects are provided.
The joint portion of the end portion of the case frame portion described in (1) is set to a horizontal plane portion of the frame portion on the vehicle body floor side.

[0014]

According to the first aspect of the present invention, the battery case accommodating the battery has a plurality of case frame portions extending in the vehicle width direction, and the case frame portion is disposed outside the vehicle frame direction in the vehicle width direction. Is connected to the front-rear skeleton of the vehicle body floor side, and the end of the case skeleton on the vehicle width direction center side is connected to the vehicle width-direction skeleton of the vehicle body floor. Even if the battery is unevenly distributed on one side in the vehicle width direction, the battery load can be distributed and borne from the case frame to the frame of the vehicle body floor. Can be set up.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention, the battery case and the case frame are bent and formed into a substantially L-shaped cross-section in which the center side in the vehicle width direction rises. The case and the other under-floor functional parts can be arranged side by side, and the ground clearance of these two parts can be secured without increasing the floor height as a whole.

According to the invention of claim 3, according to claim 2,
In addition to the effects of the invention, the front and rear skeleton portion of the vehicle body floor, the vehicle width direction skeleton portion, and the case skeleton portion form a rectangular frame structure as viewed in the front and rear direction, so that rigidity does not decrease. The thickness and weight of the battery case can be reduced.

According to the invention described in claim 4, according to claim 1,
In addition to the effects of the inventions of (1) to (3), since the vehicle width direction skeleton portion of the vehicle body floor is formed by cross members joined across the front and rear direction skeleton portions on both sides of the vehicle body floor, the load transfer between the skeleton portions is good. In addition, the battery support rigidity can be further increased.

According to the fifth and sixth aspects of the present invention, in addition to the effects of the first to fourth aspects, the longitudinal frame portion of the vehicle body floor is formed by a side member or a side sill which constitutes a basic skeleton of the vehicle body floor side. , The battery load can be distributed and distributed to the entire vehicle body, and the battery support rigidity can be further increased.

According to the invention of claim 7, according to claim 1,
In addition to the effects of the present invention, the clamp belt is wrapped around the upper surface of the battery and the battery is fastened and fixed to the bottom surface of the battery case by the clamp belt. The input can be countered, and the storage stability of the battery can be improved.

According to the invention described in claim 8, according to claim 7,
In addition to the effect of the invention, the clamp belt is connected to the case frame, so that the vibration input of the battery can be concentrated and distributed to the case frame by the clamp belt, and the storage stability of the battery can be improved. It can be even higher.

According to the ninth aspect of the present invention, the first aspect is provided.
In addition to the effects of the inventions of (8) to (8), since the end of the case skeleton is connected to the plane of the frame on the vehicle body floor side, vertical vibration input is received by the plane of the frame on the vehicle floor. Therefore, the load transmission is good and the battery support rigidity can be further increased.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings using a hybrid vehicle as an example. FIG. 1 is a plan view of a perspective view of a battery mounting portion of a hybrid vehicle. An exhaust pipe 5 of an unillustrated engine mounted on a front portion of a vehicle body 1 is provided near a side of a vehicle body floor in a front-rear direction. A battery case 12 containing a plurality of batteries 10 is disposed near the other side of the vehicle body floor so as to avoid the exhaust pipe 5.

On both sides of the lower surface of the floor panel 2, side members 3 constituting a vehicle front-rear skeleton portion with a required closed cross-sectional area are joined and arranged. A plurality of cross members 4 constituting a vehicle width direction skeleton portion having a required closed cross-sectional area are joined and arranged so as to straddle the side members 3, 3. The members 3 and the plurality of cross members 4 are connected and arranged so as to straddle each other.

As shown in FIGS. 4 and 5, in this embodiment, a recessed portion 2a is formed in the center of the floor panel 2, and an exhaust pipe 5 and a battery case 12 are provided here. The height above the ground is ensured. Therefore, the cross member 4 has a bent shape corresponding to the cross-sectional shape of the floor panel 2.

The battery case 12 is formed of a thin metal plate as shown in FIG. 2 and has a plurality of case frameworks 16 extending in the vehicle width direction.

The case frame 16 is a battery case 1
2 and a plurality of reinforcing members 14 having a substantially hat-shaped cross-section made of a metal plate material shown in FIG. 3 and joined to the outer surface of the battery case 12 to obtain a required closed cross-sectional area. It is formed.

A plurality of reinforcing members 14 are integrally connected by a connecting member 15 at the center of the floor.

In the present embodiment, the above-described bead portions 13, 13 are used.
The two batteries 10 and the junction box 11 are fixedly placed in a portion separated by the above and stored and positioned.

Battery case 12 and case frame 1
6 is bent and formed into a substantially L-shaped cross section in which the center side in the vehicle width direction rises, and a horizontal mounting seat is provided on the outer end in the vehicle width direction of the case frame 16 and the end on the center side in the vehicle width direction. Part 1
6A and 16B are formed. The mounting seat 16A is connected to the lower surface of the side member 3 which is a horizontal plane by bolts and nuts, and the mounting seat 16B is formed on the floor panel 2 serving as a lower wall of the cross member 4. The cross member 4, the side member 3, and the case frame 16 are connected to the horizontal surface or the lower surface of the cross member by bolts and nuts, etc., to form a square frame structure.

The battery 10 has a plurality of clamp belts 17 wrapped around its upper surface, and the mounting bracket 18 of the clamp belt 17 is used as a bottom of the battery case 12, specifically, a bead portion forming the upper wall of the case frame 16. 13 bolts
The battery case 12 is connected by a nut 19 and fixedly fastened to the bottom surface of the battery case 12.

4 and 5, reference numeral 6 denotes a heat shield plate that covers the upper side and both sides of the exhaust pipe 5, and reference numeral 21 denotes a case that is attached to the battery case 12 and that is made of a synthetic resin material that covers the battery 10, the junction box 11, and the like. Show the cover.

According to the structure of the above embodiment, the battery case 12 containing the battery 10 includes the plurality of case frame portions 16 extending in the vehicle width direction. Since the outer mounting seat 16A is connected to the side member 3 and the mounting seat 16B on the center in the vehicle width direction is connected to the cross member 4, the battery case 12 is unevenly distributed on one side of the vehicle body floor in the vehicle width direction. Also, the battery load is transferred from the case frame 16 to the frame members 3 and 4 on the vehicle body floor.
Therefore, the battery and the exhaust pipe 5 can be juxtaposed without deteriorating the support rigidity of the battery case 12, and the above-mentioned problem in mounting the battery and the exhaust pipe on the lower side of the floor in the hybrid vehicle described above. Can be overcome.

Here, in this embodiment, as described above, the case frame 16 is formed of one side member 3 constituting the basic frame in the front-rear direction of the vehicle body floor side and the floor panel 2.
Of the vehicle body floor in the vehicle width direction of the vehicle body floor, which is joined to the upper surface of the side members 3 and 3 on both sides. The battery load can be distributed and loaded to the entire vehicle body with good load transmission between the third and fourth members, and the mounting seats 16A and 16B of the case frame 16 can be horizontally mounted on the bottom walls of the side members 3 and the cross members 4. Since it is connected to the surface, the vibration input in the vertical direction can be received by the flat portions of the frame portions 3 and 4 on the vehicle body floor side, so that the load transmission is further enhanced and the battery support rigidity is further increased. be able to.

In particular, the battery case 12 and the case frame portion 16 are bent into a substantially L-shaped cross section in which the center side in the vehicle width direction rises, and the battery case 12 and the exhaust pipe 5 are formed in the concave portion 2 a of the floor panel 2. Can be installed side by side, it is possible to secure the ground clearance at which these two functional components are disposed without increasing the floor clearance as a whole, thereby increasing the degree of freedom in designing the vehicle body.

Further, as described above, the case frame 16 is substantially L
By bending this into a V-shaped cross section and connecting it to the side member 3 and the cross member 4,
Since the frame structure is formed in a rectangular shape when viewed from the front-rear direction by 6, 3, and 4, it is possible to reduce the thickness of the battery case 12 without reducing the rigidity.

Further, the battery 10 has a clamp belt 17 wrapped around the upper surface thereof, and the battery 10 is fastened and fixed to the bottom surface of the battery case 12 by the clamp belt 17. Of the clamp belt 1
7 is coupled to the case frame 16 via the mounting bracket 18, so that the vibration input can be concentrated on the case frame 16 and distributed and burdened, thereby improving the storage stability of the battery 10. be able to.

FIG. 6 shows a case in which the present invention is applied to a specification in which the exhaust pipe 5 is mounted at the center of the vehicle body floor. In this case, the left and right battery cases 12L and 12R are used as the battery cases 12.
Are prepared, one battery 10 is accommodated in each of these, and mounted in the same manner as in the first embodiment.

FIG. 7 shows a case where the battery is mounted on the rear end of the vehicle body floor, that is, on one side below the trunk floor. In this embodiment, the battery case 12 is mounted similarly to the first embodiment. On the side opposite to the side where the exhaust pipe 5 and the muffler 7 are arranged on the vehicle body floor, the vehicle is mounted across the side member 3 and the plurality of cross members 4.

Accordingly, the embodiment shown in FIGS. 6 and 7 can provide exactly the same effects as those of the first embodiment.

In each of the above embodiments, the case frame 16
Although the most preferable example is shown in which the side member 3 as the front-back direction frame portion and the cross member 4 as the vehicle width direction frame portion connected to the side member 3 are connected, the present invention is not limited thereto. Needless to say, for example, the front-rear skeleton portion may be a side sill (not shown), or the vehicle width direction skeleton portion may not be directly connected to the side member 3 or the side sill in an intersecting manner.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a battery case, a battery, and the like according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a reinforcing member constituting a case framework in the first embodiment of the present invention.

FIG. 4 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 5 is a view taken along line BB of FIG. 1;

FIG. 6 is a schematic explanatory view showing a second embodiment of the present invention in correspondence with FIG. 4;

FIG. 7 is a schematic explanatory view showing a third embodiment of the present invention in correspondence with FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Floor panel 3 Side member (front-back direction frame part) 4 Cross member (vehicle width direction frame part) 5 Exhaust pipe 10 Battery 12, 12L, 12R Battery case 16 Case frame part 16A, 16B End part 17 Clamp belt

Claims (9)

[Claims] A battery case accommodating a battery is provided with a plurality of case frameworks extending in the vehicle width direction, and the outer ends of the case frameworks in the vehicle width direction are provided on the vehicle body floor side in the front-back direction framework. A battery mounting structure for an electric vehicle, wherein an end of the case frame portion on the vehicle width direction center side is connected to a vehicle width direction frame portion of a vehicle body floor. 2. The battery case and the case frame portion,
The battery mounting structure for an electric vehicle according to claim 1, wherein the battery mounting structure is formed by bending a substantially L-shaped cross section in which a center side in a vehicle width direction rises. 3. The frame structure according to claim 2, wherein a frame portion in the front-rear direction of the vehicle body floor and a frame portion in the vehicle width direction are connected to each other, and these two frame portions and the case frame portion constitute a square frame structure. A battery mounting structure for an electric vehicle according to the above. 4. The battery mounting for an electric vehicle according to claim 1, wherein the vehicle width direction frame portion is a cross member connected across the front and rear direction frame portions on both sides of the vehicle body floor. Construction. 5. The battery mounting structure for an electric vehicle according to claim 1, wherein the front-rear skeleton portion is a side member joined to both sides of a lower surface of the floor panel. 6. The sill of claim 1, wherein the skeletal portion in the front-rear direction is a side sill joined to both ends of the floor panel.
5. The battery mounting structure for an electric vehicle according to any one of 4. 7. The battery mounting structure for an electric vehicle according to claim 1, wherein a battery is wound around a clamp belt on an upper surface thereof, and the battery is fastened and fixed to a bottom surface of the battery case by the clamp belt. . 8. The battery mounting structure for an electric vehicle according to claim 7, wherein the clamp belt is connected to the case frame. 9. The battery mounting structure for an electric vehicle according to claim 1, wherein a connecting portion at an end of the case frame portion is set to a horizontal surface portion of the frame portion on the vehicle body floor side.