KR102371247B1 - Under body for electric vehicle - Google Patents

Abstract

An underbody for an electric vehicle is disclosed. In an underbody for an electric vehicle according to an embodiment of the present invention, a center floor panel is assembled between both side sills composed of a side sill inner panel and a side sill outer panel of the vehicle, and is mounted on a mounting member mounted inside the side sill. In an electric vehicle underbody for securing a battery pack storage space under the center floor panel by means of a seat cross member mounted on an upper surface of the center floor panel in the vehicle width direction, the seat cross member corresponding to both ends of the seat cross member Connection members connected to the inner surface of the side sill inner panel are mounted on each lower surface of the center floor panel, respectively.

Description

Underbody for electric vehicle {UNDER BODY FOR ELECTRIC VEHICLE}

The present invention relates to an underbody for an electric vehicle, and more particularly, to an underbody for an electric vehicle that improves the side impact performance and rigidity of a vehicle body.

BACKGROUND ART In general, an electric vehicle is driven and driven by an electric motor supplied with energy from a battery pack.

Examples of the electric vehicle include a Plug-in Hybrid Electric Vehicle (PHEV), a Battery Electric Vehicle (BEV), and a Fuel Cell Electric Vehicle (FCEV).

Such an electric vehicle is equipped with a high-voltage battery pack, which is an assembly of battery modules, on a vehicle body, and can be driven by a driving motor operated by receiving power from the battery pack as a power source.

Since the battery pack has a fairly large volume and weight, it is important to secure an appropriate mounting space in the vehicle body in order to mount it on the vehicle body.

The battery pack is mounted on a lower portion of a center floor panel formed between side sills of an underbody in a vehicle body.

In this case, the battery pack is mounted on the lower part of the center floor panel through various mounting units such as brackets on the side sill.

However, the conventional underbody for an electric vehicle as described above requires a separate mounting unit to mount the battery case under the center floor panel together with the side sill through the battery cross member, so parts for assembling the mounting unit The number and assembly process are increased, and the weight of the vehicle body can be increased.

Accordingly, the underbody for the electric vehicle requires a space for applying parts such as a mounting unit for mounting the battery pack, and a gap for suppressing noise generation between the battery case and the center floor panel. Since a space is required for this, it is disadvantageous to the degree of freedom of arrangement of the battery pack, and there is also a limit to increasing the capacity of the battery pack.

In addition, in the underbody for an electric vehicle according to the prior art, since the battery pack is simply supported under the center floor panel through a separate mounting unit, safety and durability against collision load are insufficient in the case of a side collision, so There is a problem in that the battery pack is easily damaged.

In addition, the underbody for an electric vehicle has a problem in that the side sill rotates in a specific direction when the side sill collides with the vehicle body due to insufficient connectivity between the side sill and the center floor panel.

Matters described in this background section are prepared to enhance understanding of the background of the invention, and may include matters that are not already known to those of ordinary skill in the art to which this technology belongs.

According to an embodiment of the present invention, a connecting member interconnecting the inner surface of the inner surface of the lower surface of the center floor panel and the inner side of the side sill inner panel is gusset at positions corresponding to both ends of the seat cross member disposed on the upper portion of the center floor panel in the vehicle width direction. It is intended to provide an underbody for an electric vehicle that can be applied as a (gusset) structure to improve the torsional rigidity of the vehicle body in the event of a side collision and increase the durability performance.

In addition, an embodiment of the present invention is to provide an underbody for an electric vehicle capable of fixing the battery pack by applying a plurality of mounting members inside the side sill and further improving the side rigidity of the vehicle body.

In one or more embodiments of the present invention, a center floor panel is assembled between both side sills composed of a side sill inner panel and a side sill outer panel of a vehicle, and the center floor panel is assembled by a mounting member mounted inside the side sill. In the underbody for an electric vehicle for securing a battery pack storage space under a panel, a seat cross member is mounted on an upper surface of the center floor panel in the vehicle width direction, and the center floor panel corresponding to both ends of the seat cross member It is possible to provide an underbody for an electric vehicle in which a connection member connected to an inner surface of the side sill inner panel is mounted on each lower surface, respectively.

In addition, the connection member may be inclinedly disposed in a state of being joined to the lower surface of the center floor panel and the inner surface of the side sill inner panel through flanges formed at both ends, respectively.

In addition, the seat cross member may be joined to the upper surface of the side sill inner panel together with the center floor by forming connecting portions at both ends thereof.

In addition, the mounting member includes a reinforcing member that is opened toward the inside of the vehicle body in a state in which a joint is formed so that both ends are joined to the inner surface of the side sill inner panel by bending one panel in multiple stages; It may be composed of a pipe nut installed through the lower surface and the reinforcing member at the same time.

In addition, the mounting member is opened toward the outside of the vehicle body in a state in which a joint is formed so that both ends are interposed between the inner panel and the outer panel to be joined by bending one panel in multiple stages, and the longitudinal direction is formed inside the side sill. A plurality of fixing brackets disposed along the line, a reinforcing tube that is formed of an extruded tube and is inserted into the fixing bracket through a mounting part formed on the inside based on the central vertical bulkhead formed in the central part, and reinforces rigidity through a shock absorbing part formed on the outside, and the The lower surface of the side seal inner panel may include a pipe nut installed through the fixing bracket and the mounting portion at the same time.

In addition, the mounting portion is made by forming one vertical bulkhead and one horizontal bulkhead between the inner surface of the reinforcing pipe and the central vertical bulkhead, and the shock absorbing part is between the outer surface of the reinforcing pipe and the central vertical bulkhead. It may be achieved by forming one horizontal barrier rib and two diagonal barrier ribs.

According to an embodiment of the present invention, a connecting member interconnecting the inner surface of the inner surface of the lower surface of the center floor panel and the inner side of the side sill inner panel is gusset at positions corresponding to both ends of the seat cross member disposed on the upper portion of the center floor panel in the vehicle width direction. When applied as a (gusset) structure, it has the effect of improving the torsional rigidity of the vehicle body during a side collision and increasing the durability performance.

In addition, the effects obtainable or predicted by the embodiments of the present invention are to be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. That is, various effects predicted according to an embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a schematic perspective view of an underbody for an electric vehicle according to embodiments of the present invention.
2 is a bottom view of an underbody for an electric vehicle according to embodiments of the present invention.
3 is a partial cross-sectional view of an underbody for an electric vehicle according to a first embodiment of the present invention.
4 is a partial cross-sectional view of an underbody for an electric vehicle according to a second embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. However, the present invention may be implemented in several different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are applied to the same or similar components throughout the specification.

In addition, in the following description, the names of the components are divided into 1st, 2nd, etc., because the names of the components are the same to distinguish them, and the order is not necessarily limited thereto.

1 is a schematic perspective view of an underbody for an electric vehicle according to embodiments of the present invention, FIG. 2 is a bottom view of an underbody for an electric vehicle according to embodiments of the present invention, and FIG. 3 is a first embodiment of the present invention It is a partial cross-sectional view of an underbody for an electric vehicle according to an example, and FIG. 4 is a partial cross-sectional view of an underbody for an electric vehicle according to a second embodiment of the present invention.

Referring to FIG. 1 , first, an underbody 1 for an electric vehicle according to embodiments of the present invention includes both side sills 10 including a side sill inner panel 11 and a side sill outer panel 13 of the vehicle. A center floor panel 20 is assembled between them.

In addition, the underbody 1 for the electric vehicle may secure a storage space for a battery pack (not shown) under the center floor panel 20 .

In this case, the battery pack is fixed to the vehicle body through a plurality of mounting members 60 mounted inside the side seal 10 .

In other words, a plurality of the mounting members 50 are disposed in the side sill 10 in the longitudinal direction of the vehicle body.

A pipe nut N is installed through the mounting member 50 in the vertical direction together with the lower surface of the side seal inner panel 11 .

Here, the battery pack is fixed to the vehicle body by a bolt (not shown) fastened to the pipe nut N.

Such a mounting member 50 will be described in more detail below.

And the seat cross member 30 is mounted on the upper surface of the center floor panel 20 in the vehicle width direction of the underbody 1 for the electric vehicle.

At this time, the sheet cross member 30 forms the connecting portions 31 at both ends.

The seat cross member 30 is joined to the upper surface of the side sill inner panel 11 together with the center floor panel 20 .

That is, the connecting portions 31 formed at both ends of the sheet cross member 30 are three-fold bonded to the upper surfaces of the center floor panel 20 and the side sill inner panel 11 to improve bonding rigidity.

Connection members 40 are mounted on each lower surface of the center floor panel 20 corresponding to both ends of the seat cross member 30 , respectively.

In this case, the connection member 40 is connected to the inner surface of the side sill inner panel 11 on the lower surface of the center floor panel 20 .

In addition, the connecting member 40 forms both end flanges 41 at both ends.

The connecting member 40 is respectively joined to the lower surface of the center floor panel 20 and the inner surface of the side sill inner panel 11 through the both side flanges 41 .

The connecting member 40 is inclined with respect to a corner formed between the center floor panel 20 and the side sill inner panel 11 .

Meanwhile, the mounting member 50 according to the first embodiment includes a reinforcing member 51 and a pipe nut N, as shown in FIG. 2 .

The reinforcing member 51 is mounted inside the side seal 10 and is formed by bending one panel formed in the longitudinal direction in multiple stages.

Both ends of the reinforcing member 51 are bent outwardly to form a joint portion 51a.

At this time, the reinforcing member 51 is bonded to the inner surface of the side sill inner panel 11 through the bonding portion 51a.

The reinforcing member 51 is formed to open toward the inside of the vehicle body.

That is, in the reinforcing member 51 according to the first embodiment, one panel is bent in multiple stages to form an upper surface, a side surface, and a lower surface. ), the side surface is formed to protrude toward the outside of the vehicle body so that the side surface is adjacent to the outer surface of the side sill outer panel 13 .

The pipe nut N is installed vertically through the upper and lower surfaces of the reinforcing member 51 and the lower surface of the side seal inner panel 11 at the same time.

The pipe nut N is bolted to mount the battery pack to the vehicle body.

As shown in FIG. 3 , the mounting member 50 according to the second embodiment includes a fixing bracket 53 , a reinforcing tube 55 , and a pipe nut N. As shown in FIG.

The fixing bracket 53 is formed similarly to the shape of the side inner panel 11 by bending one panel in multiple stages.

Both ends of the fixing bracket 53 are bent outward to form a fitting portion 51a.

In this case, the fitting part 51a is interposed between the side sill inner panel 11 and the side sill outer panel 13 and is joined.

The fixing bracket 53 is formed to open toward the outside of the vehicle body, that is, toward the side sill outer panel 13 .

That is, in the fixing bracket 53 according to the second embodiment, one panel is bent in multiple stages to form an upper surface, a side surface, and a lower surface. ) and the side sill outer panel 13, respectively, and the side surface is formed to protrude toward the inside of the vehicle body so as to be adjacent to the inner surface of the side sill inner panel 11.

A plurality of the fixing brackets 53 are installed along the longitudinal direction inside the side seal 10 to fix the reinforcing tube material 55 to be described below.

And the reinforcing tube 55 is formed of an extruded tube, and is formed of an upper surface, a lower surface, an inner surface, an outer surface, and a plurality of partition walls.

When the reinforcing pipe member 55 is described in more detail, the reinforcing pipe member 55 has a central vertical bulkhead dividing the central portion in the vertical direction.

At this time, the central vertical bulkhead is disposed to be in a straight line with respect to the fitting portion 51a of the fixing bracket 53 .

In addition, the reinforcing tube 55 has a mounting portion 55a on the inside with respect to the central vertical bulkhead, and a shock absorbing portion 55b on the outside.

At this time, the mounting portion (55a) is disposed between the upper surface and the lower surface of the fixing bracket (53) is fitted.

In addition, the mounting portion 55b is formed by forming one vertical partition wall and one horizontal partition wall between the inner surface of the reinforcing pipe member 55 and the central vertical partition wall.

The shock absorbing part 55b is formed by forming one horizontal partition wall and two diagonal partition walls between the outer surface of the reinforcing pipe member 55 and the central vertical partition wall.

In addition, the pipe nut (N) is installed vertically through the upper surface of the fixing bracket (53), the mounting portion (53a) of the reinforcing pipe member (55), and the lower surface of the side seal inner panel (11) at the same time.

The pipe nut N is for mounting the battery pack to the vehicle body by fastening the bolts, as in the first embodiment.

Accordingly, the underbody 1 for an electric vehicle according to embodiments of the present invention is positioned at positions corresponding to both ends of the seat cross member 30 disposed on the upper portion of the center floor panel 20 in the vehicle width direction, the center floor panel 20 ) by applying the connecting member 40 that interconnects the lower surface of the side sill inner panel 11 with the inner surface of the side sill inner panel 11 in a gusset structure, the torsional rigidity of the vehicle body during a side collision is improved, and durability performance is increased can do.

That is, the underbody 1 for the electric vehicle connects the center floor panel 20 and the side sill 10 through the connection member 40, thereby effectively dispersing the input collision energy in the case of a side collision. It is possible to improve the rigidity.

In addition, in the underbody 1 for an electric vehicle according to the embodiments of the present invention, the mounting member 50 is applied to the inside of the side sill 10 to fix the battery pack and at the same time, it is possible to further improve the rigidity of the side of the vehicle body. .

Although the above has been described with reference to a preferred embodiment of the present invention, those of ordinary skill in the art can variously change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that modifications and variations are possible.

1: Underbody for electric vehicle 10: Side sill
11: Side sill inner panel 13: Side sill outer panel
20: center floor panel 30: seat cross member
31: connection part 40: connection member
41: flange 50: mounting member
51: reinforcing member 51a: joint
53: fixing bracket 53a: fitting part
55: reinforcing pipe 55a: mounting part
55b: shock absorber N: pipe nut

Claims (6)

A center floor panel is assembled between both side sills composed of a side sill inner panel and a side sill outer panel of the vehicle, and a battery pack storage space is secured under the center floor panel by a mounting member mounted inside the side sill. In the underbody for an electric vehicle,
A seat cross member is mounted on an upper surface of the center floor panel in the vehicle width direction, and a connection member connected to an inner surface of the side sill inner panel is mounted on each lower surface of the center floor panel corresponding to both ends of the seat cross member. becomes,
The mounting member has a structure that is opened toward the outside of the vehicle body between the side sill inner panel and the outer panel, a fixing bracket forming a fitting portion, a reinforcing tube fitted to the fixing bracket, and a lower surface of the side sill inner panel , an underbody for an electric vehicle including a pipe nut installed through the fixing bracket and the mounting part provided on the reinforcing pipe at the same time. According to claim 1,
The connecting member is
An underbody for an electric vehicle which is disposed obliquely while being joined to the lower surface of the center floor panel and the inner surface of the side sill inner panel through flanges formed at both ends. According to claim 1,
The seat cross member is
An underbody for an electric vehicle that is joined to the upper surface of the side sill inner panel together with the center floor by forming connection parts at both ends. delete According to claim 1,
The fixing bracket is opened toward the outside of the vehicle body in a state in which the fitting part is formed so that both ends are interposed between the side sill inner panel and the outer panel to be joined by bending one panel in multiple stages, and inside the side sill along the longitudinal direction are placed in multiple
The reinforcing tube is formed of an extruded tube and is fitted into the fixing bracket through the mounting portion formed on the inner side based on the central vertical bulkhead formed in the central portion, and the underbody for an electric vehicle reinforces the rigidity through the shock absorbing portion formed on the outer side. 6. The method of claim 5,
The mounting portion is made by forming one vertical bulkhead and one horizontal bulkhead between the inner surface of the reinforcing pipe and the central vertical bulkhead,
The shock absorbing part is an underbody for an electric vehicle formed by forming one horizontal bulkhead and two diagonal bulkheads between the outer surface of the reinforcing pipe and the central vertical bulkhead.

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