Vehicle under-floor structure

Abstract

To provide a vehicle under-floor structure that can prevent a floor cross from contacting the top surface of a battery module at the time of a side collision.SOLUTION: A vehicle under-floor structure includes: a tunnel brace extending in a front-back direction of a vehicle; a floor cross extending from both side surfaces of the tunnel brace in a width of the vehicle; a plurality of battery modules disposed below the floor cross; battery crosses each extending between the plurality of battery modules along the width direction; support members each disposed above the battery cross and having two protrusions formed along the width direction to protrude upward; and frame members each disposed along the front-back direction to straddle the protrusions.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a vehicle underfloor structure. [Background technology]

[0002] 2. Description of the Related Art Conventionally, structures for protecting batteries have been considered for vehicles such as battery-equipped electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs).

[0003] Patent Document 1 describes a battery pack in which an intermediate mount that supports an upper case is disposed on the upper part of an upper cross member that is disposed in each gap between adjacent battery modules. A damper is provided on the upper surface of the intermediate mount as a shock absorbing member.

[0004] A tunnel brace extends in the vehicle's front-rear direction at the center of the vehicle's width. Floor cloths extend from both sides of the tunnel brace in the vehicle's width direction. The tunnel brace and floor cloths are disposed above the battery. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-046945 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the conventional configuration, during a side collision, the floor cloth may rotate and deform starting from the tunnel brace, causing the floor cloth to come into contact with the top surface of the battery (battery module).

[0007] In addition, it is possible to place a support member (intermediate mount) on the battery cross (upper cross member) to support the floor cross, but since the support position changes depending on the size of the battery, it may not be possible to properly support the underside of the floor cross.

[0008] The present disclosure has been made in consideration of the above, and aims to provide a vehicle underfloor structure that can prevent the floor cloth from contacting the upper surface of a battery module in the event of a side collision. [Means for solving the problem]

[0009] The vehicle underfloor structure of the present disclosure comprises a tunnel brace extending along the fore-and-aft direction of the vehicle, a floor cross extending from both sides of the tunnel brace along the width direction of the vehicle, a plurality of battery modules arranged under the floor cross, a battery cross extending along the width direction between the plurality of battery modules, a support member provided above the battery cross and having two protrusions protruding upwardly formed along the width direction, and a skeletal member arranged straddling the protrusions along the fore-and-aft direction. Effect of the Invention

[0010] According to the present disclosure, it is possible to realize a vehicle underfloor structure that can prevent the floor cloth from contacting the upper surface of the battery module in the event of a side collision. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic configuration diagram of a vehicle underfloor structure according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view corresponding to the line AA in FIG. [Diagram 3] FIG. 3 is a partial enlarged view of a protrusion of the support member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A vehicle underfloor structure according to an embodiment of the present disclosure will be described with reference to the drawings. Note that components in the following embodiments include those that are easily replaceable by a person skilled in the art, or those that are substantially the same.

[0013] (Embodiment) The vehicle underfloor structure according to this embodiment is a structure for protecting a battery arranged under the floor of a vehicle such as a battery-equipped electric vehicle (BEV) or a plug-in hybrid vehicle (PHEV).

[0014] FIG. 1 is a schematic diagram of a vehicle underfloor structure according to an embodiment. FIG. 2 is a cross-sectional view corresponding to the line AA in FIG. 1. As shown in FIGS. 1 and 2, the vehicle underfloor structure 1 includes a tunnel brace 2, a floor cloth 3, a battery module 4 (see FIG. 2), a battery cloth 5, a support member 6, a frame member 7, a battery cover 8 (see FIG. 2), and a floor pan 9 (see FIG. 2). Note that in FIG. 1, only the contour shapes of the tunnel brace 2, the floor cloth 3, and the frame member 7 are illustrated, and the battery module 4, the battery cover 8, and the floor pan 9 are omitted. In the following description, the front-rear direction of the vehicle is defined as direction D1, and the width direction of the vehicle is defined as direction D2.

[0015] The tunnel brace 2 has a trapezoidal cross section and extends to the center of the vehicle along the direction D1.

[0016] The floor cross section 3 has a trapezoidal cross section and extends along the direction D2 from both side surfaces of the tunnel brace 2. A plurality of floor cross sections 3 are disposed at predetermined intervals along the direction D1.

[0017] The battery module 4 is disposed under the floor cross 3. A plurality of battery modules 4 are disposed along the direction D1 with a battery cross 5 interposed therebetween.

[0018] The battery crosses 5 extend along the direction D2 between the battery modules 4. A plurality of battery crosses 5 are disposed at predetermined intervals along the direction D1.

[0019] The support member 6 is provided above the battery cross 5. The support member 6 has two projections 6a that protrude upward along the direction D2.

[0020] The framework member 7 is disposed across the protrusion 6a along the direction D1. The framework member 7 is located directly below both ends of the tunnel brace 2 in the direction D2.

[0021] Fig. 3 is a partially enlarged view of the protrusion of the support member. As shown in Fig. 3, the tip of the protrusion 6a and the framework member 7 are formed with a recess 6b and a protrusion 7a that fit together.

[0022] The battery cover 8 protects the battery module 4 .

[0023] The floor pan 9 supports the floor cloth 3 .

[0024] According to the vehicle underfloor structure 1 described above, if the floor cloth 3 undergoes rotational deformation during a side collision, the load from the floor cloth 3 is received by the framework member 7, thereby preventing the floor cloth 3 from contacting the upper surfaces of the battery modules 4. In particular, since the framework member 7 is located directly below both ends of the tunnel brace 2 in the direction D2, it is possible to prevent the ends of the floor cloth 3 on the tunnel brace 2 side from contacting the upper surfaces of the battery modules 4.

[0025] Furthermore, according to the vehicle underfloor structure 1, the framework member 7 extends along the direction D1, so that the floor cloth 3 can be prevented from contacting the upper surface of the battery module 4 regardless of the position of the battery cloth 5. Therefore, the vehicle underfloor structure 1 can be used for vehicles equipped with any type of battery, regardless of the size of the battery.

[0026] Furthermore, according to the vehicle underfloor structure 1, the tip of the protrusion 6a and the skeletal member 7 are formed with a recess 6b and a protrusion 7a that fit into each other, so that the load from the floor cross 3 can prevent the skeletal member 7 from shifting and the floor cross 3 from coming into contact with the upper surface of the battery module 4.

[0027] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0028] 1 Vehicle underfloor structure 2 Tunnel brace 3 Floor Cross 4 Battery Module 5 Battery Cross 6 Supporting member 6a Protrusion 6b Recess 7. Frame members 7a Convex part 8 Battery cover 9 Floor Pan

Claims

1. A tunnel brace extending along the front-rear direction of the vehicle; A floor cross extending from both side surfaces of the tunnel brace along the width direction of the vehicle; A plurality of battery modules disposed under the floor cloth; a battery cross extending along the width direction between the plurality of battery modules; a support member provided above the battery cross and having two protrusions formed along the width direction and protruding upward; a framework member disposed across the protrusion along the front-rear direction; A vehicle underfloor structure comprising:

2. The vehicle underfloor structure according to claim 1 , wherein the framework members are positioned directly below both ends of the tunnel brace in the width direction.

3. The vehicle underfloor structure according to claim 1 , wherein the protrusion and the framework member are formed with a recess and a protrusion that fit into each other.

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