JP3016325B2 - Battery frame mounting structure for electric vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In an electric vehicle, a large number of batteries are required as a drive source. For example, as disclosed in Japanese Patent Application Laid-Open No. 52-16733, a plurality of batteries are provided below a vehicle body floor. The battery is mounted in a pack (here, the motor and the like are also integrated).

[0003] This type of battery mounting structure is advantageous in that it is not necessary to dispose a battery with a chemical change therein in the vehicle compartment, and it is easier to mount the battery than in the vehicle compartment. It is.

[0004]

However, in the above-described conventional structure, the battery pack is simply attached to the lower side of the vehicle body floor. Therefore, the vehicle body floor needs to have a strong structure that can withstand the weight of the battery. There is a problem that various reinforcing materials need to be added.

[0005] In addition, when replacing or inspecting a battery or the like, work such as lowering the battery pack in a narrow space below the battery pack is required. Therefore, the work is performed in a limited work space, and it is difficult to perform the work. There is a problem.

In the structure in which the battery is disposed below the vehicle body floor, a large forward inertia force acts on the battery pack at the time of, for example, a vehicle frontal collision. Requires sufficient reinforcement, and the reinforcement of the vehicle body floor itself with respect to the battery weight also causes a problem that the weight of the vehicle body is greatly increased.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a battery frame mounting portion structure for an electric vehicle that can easily replace a battery and secure safety at the time of a collision while suppressing an increase in vehicle body weight. .

[0008]

A battery frame mounting for an electric vehicle in which a plurality of batteries are mounted below a vehicle body floor and a battery frame constituting a vehicle body floor integrally with the vehicle body floor is detachably provided. Part structure,
The battery frame is divided into a plurality of frame bodies at the front and rear, and the frame bodies are slidably locked from the rear between side members provided along both sides of the vehicle body floor in the front-rear direction. A cushioning material is interposed before and after, and the side frames and the side members provided along both sides of the frame main body along the front and rear direction are fixed by fasteners that break when a constant front and rear direction force is applied. I have.

[0009]

The vehicle body floor is integrated with the battery frame so that the battery frame functions as a member for reinforcing the vehicle body floor. At the time of battery replacement and inspection work, the work space can be secured behind the vehicle body because the battery frame is slidably locked to the vehicle body floor from behind. Further, for example, at the time of a frontal collision of the vehicle, relative movement between the vehicle body floor and the battery frame is prevented by the fastener, and when a force exceeding a certain level is applied, the fastener is broken by a shear force to absorb energy. At this time, when each frame main body moves in the forward direction, the shock when the frame main body collides with the vehicle body floor is absorbed by the cushion material.

[0010]

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

In FIG. 1, reference numeral 1 denotes a vehicle body floor. The vehicle body floor 1 comprises a floor panel 2 and a floor member 3. The floor member 3 includes side members 4 provided on both sides along the front-rear direction, a dash cross member 5 provided in the vehicle width direction connecting the side members 4, and an outrigger 6 provided on an outer wall of the side member 4. And a side sill 7 attached through the sill.
Therefore, the floor member 3 has a shape in which the rear is open. Here, the side member 4, the dash cross member 5, and the side sill 7 are formed into a closed cross-sectional structure by using an aluminum extruded material or a panel material alone or joined to the floor panel 2.
As shown in FIGS. 2 and 3, the side member 4 is formed with an inclined surface 4A that descends inward along the front-rear direction of the inner wall, and has a wide lower portion.

A battery frame 8 is slidably locked from the rear between the side members 4 of the floor member 3.

As shown in FIG. 1, the battery frame 8 is divided into two frame bodies 9 and 10 at the front and rear. The front frame body 9 has four battery groups B, and the rear frame body 10 has two battery bodies. Each of the groups B is mounted.

The frame bodies 9 and 10 each include a side frame 11 provided on both sides along the front-rear direction, and a front cross frame 12 and a rear cross frame 13 provided on the front and rear parts along the vehicle width direction. Have been.
The side frame 11, the front cross frame 12, the rear cross frame 13, and the partition member 14, which will be described later, are formed in a closed cross-sectional structure by extruding aluminum or a panel material similarly to the side member 4 and the like.

Here, as shown in FIGS. 2 and 3, each of the side frames 11 of the frame bodies 9 and 10 has an upper half protruding outward and an inclined surface 11A corresponding to the inclined surface 4A of the side member 4. Since the inclined surface 11A is supported by the inclined surface 11A of the side member 4, the frame bodies 9, 10 are inserted into the side member 4 from the rear and slidably locked.

A partition member 14 is arranged in front of and behind the frame body 9 and behind the frame body 10 as a cushion member which is long in the vehicle width direction. An engaging portion 14A having a similar cross-sectional shape is provided,
The front and rear cross sections of the partition member 14 are provided with a shock absorbing material 14B such as urethane (the last partition member 14).
(Except for the rear surface). Here, the rearmost partition member 14 is fixed to the side member 4 after being inserted into the side member 4.

The sub-frames 11 of the frame bodies 9 and 10 and the side members 4 of the floor members 3 are used as fasteners penetrating through both side walls as shown in FIGS. Are fixed by a bolt 15A and a nut 15B, and when a predetermined inertia force acts on the battery frame 8 at the time of a vehicle frontal collision, the bolt 15A
The shear force acting at right angles to the axial direction of
A breaks and absorbs impact energy. 15C is a color.

According to the structure of the embodiment, when the battery group B is mounted, the battery group B is mounted on each of the frame bodies 9 and 10 first. Next, the partition member 14 is inserted between the two side members 4 of the floor member 3 from the rear of the floor member 3 to the position of the dash cross member 5. At this time, the partition member 14 is smoothly inserted along the side member 4 by the locking portions 14A at both ends.

The frame body 9 is connected to the inclined surface 11A of the side frame 11 by the inclined surface 4A of the side member 4.
The main body 10 is inserted in the same manner as the frame main body 9 with the partition member 14 interposed therebetween, and the rearmost partition member 14 is inserted last, so that the partition member 1 is inserted.
4 is fixed to the side member 4. Next, the side members 4 and the side frames 11 of the frame bodies 9 and 10 are fixed by bolts 15A and nuts 15B.

Therefore, the work described above is performed on the vehicle body floor 1.
In the space behind, the frame bodies 9 and 10 that are divided and each one of which is reduced in weight can be installed without restriction of the space in the vertical direction. That is, the mounting work of the battery group B can be easily performed in a sufficient space.

When the battery frame 8 is mounted in this manner, the floor member 3 formed by the side members 4 and the dash cross members 5 having a closed cross section, the side frame 11 having a closed cross section, and the front cross Since the frame body 9 and 10 formed by the frame 12 and the rear cross frame 13 are integrally formed to form the vehicle body floor, the strength and rigidity of the vehicle body are high and compared with the case where the battery frame 8 is simply supported on the vehicle body floor 1. As a result, the number of reinforcing members is small, and the weight of the vehicle body can be reduced.

For example, at the time of a frontal collision of the vehicle body, an inertial force for moving the battery frame 8 toward the front of the vehicle body acts, and a shear force perpendicular to the axial direction is applied to the bolt 15A fastening the side member 4 to the side frame 11. Works, but if this is a load exceeding a certain level, the bolt 15
The impact energy is absorbed by breaking A.

When the bolt 15A is broken, the battery frame 8 is free from the vehicle body floor 1 and moves forward due to inertia. When moved, the shock absorbing material 14B of each partition member 14 is compressed, for example, the second partition member 14 from the front is sandwiched between the frame bodies 9 and 10 as shown in FIG. Is absorbed.

Therefore, since a large amount of impact energy is absorbed by the breakage of the bolts 15A and the compression of the impact absorbing material 14B, it is possible to prevent a large impact force from acting on the frame bodies 9, 10 and the floor member 3 side. Can be.

Since the battery frame 8 is divided into the two frame bodies 9 and 10, handling during inspection and replacement of the battery is facilitated.

Next, a second embodiment will be described with reference to FIGS. In this embodiment, the second partition member 14 from the front in the first embodiment is eliminated, and the rear end of the side frame 11 of the frame body 9 and the frame body 1 are removed.
The shock absorber 16 such as urethane as a cushioning material is interposed between the front end of the side frame 11 and the front end of the side frame 11.

More specifically, as shown in FIG. 5, in this embodiment, the side member 4 of the floor member 3 is formed in a concave shape in cross section, and the side frame 11 of the frame body 9 engaged with the side member 4 is formed in cross section. It is formed in a convex shape. A shock absorber 16 made of urethane as a cushion material is provided in the rear end opening of the side frame 11 of the frame body 9.
The front end of the side frame 11 of the frame body 10 extending forward is insertable into the rear end opening of the side frame 11. Here, the same partition members 14 as in the first embodiment are arranged in front of the frame body 9 and behind the frame body 10.

This embodiment is advantageous in that one partition member 14 can be eliminated in addition to the effects of the above-described embodiment. Note that the other configuration and operation are the same as those of the first embodiment, and thus the same portions are denoted by the same reference numerals and description thereof will be omitted.

[0029]

As described above, according to the present invention, the battery frame can be integrated with the vehicle body floor and the battery frame can function as a member for reinforcing the vehicle body floor. The strength and rigidity of the vehicle body are increased as compared with the case where it is supported, and no special reinforcing member or the like is required, so that the vehicle body weight can be reduced.

Further, since the battery frame is slidably locked from the rear of the vehicle body floor, a sufficient space for battery replacement and inspection work can be secured at the rear of the vehicle body, and the work can be easily performed.

If, for example, an impact force exceeding a certain level acts upon a frontal collision of the vehicle, the fastener for attaching the side frame and the side member is broken, so that the shock can be absorbed. Can also absorb the shock caused by the collision.

[Brief description of the drawings]

FIG. 1 is an overall perspective explanatory view of one embodiment of the present invention.

FIG. 2 is a perspective view of the main part.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram of a deformation state of a cushion material at the time of a vehicle collision.

FIG. 5 is an enlarged perspective view of a main part of a second embodiment of the present invention.

FIG. 6 is a perspective view of a main part of a second embodiment.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Body floor 4 ... Side member 8 ... Battery frame 9 ... Frame main body 10 ... Frame main body 14 ... Partition member (cushion material) 15A ... Bolt (fastener) B ... Battery group (battery)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (1)

(57) [Claims] 1. A battery frame mounting portion structure for an electric vehicle in which a plurality of batteries are mounted below a vehicle body floor and a battery frame constituting a vehicle body floor integrally with the vehicle body floor is detachably provided. The battery frame is divided into a plurality of frame bodies before and after, and the frame body is slidably locked from the rear between side members provided on both sides of the vehicle body floor along the front-rear direction. A cushioning material is interposed between the front and rear of the frame body, and the side members provided on both sides of the frame body along the front and rear direction and the side members are fixed by fasteners that break when a constant front and rear direction force is applied. A battery frame mounting portion structure for an electric vehicle.