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EP-4741199-A1 - VEHICLE LOWER PORTION STRUCTURE

EP4741199A1EP 4741199 A1EP4741199 A1EP 4741199A1EP-4741199-A1

Abstract

A vehicle lower portion structure has a pair of rocker portions (40) extending in a vehicle longitudinal direction and separated from one another in a vehicle transverse direction; a battery case (32) that has joint portions (100) joined to the rocker portions (40), that is disposed between the pair of rocker portions (40), and in which battery cells (31) are accommodated; an underpanel (50) covering the battery case (32) and the pair of rocker portions (40) from a vehicle lower side; and accommodation portions (60) provided between the battery case (32) and the rocker portions (40), further toward vehicle transverse direction inner sides than the joint portions (100) and at an upper side of the underpanel (50). High-voltage cables (62) that extend in the vehicle longitudinal direction are accommodated in the accommodation portions (60).

Inventors

  • MOTOI, DAISUKE

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260513
Application Date
20251022

Claims (12)

  1. A vehicle lower portion structure, comprising: a pair of rocker portions (40) extending in a vehicle longitudinal direction and separated from one another in a vehicle transverse direction; a battery case (32) that has joint portions (100) joined to the rocker portions (40), that is disposed between the pair of rocker portions (40), and in which battery cells (31) are accommodated; an underpanel (50) covering the battery case (32) and the pair of rocker portions (40) from a vehicle lower side; and accommodation portions (60) provided between the battery case (32) and the rocker portions (40), further toward vehicle transverse direction inner sides than the joint portions (100) and at an upper side of the underpanel (50), wherein accommodated objects (62) that extend in the vehicle longitudinal direction are accommodated in the accommodation portions (60).
  2. The vehicle lower portion structure of claim 1, wherein the underpanel (50) is joined to the rocker portions (40).
  3. The vehicle lower portion structure of claim 2, wherein: the rocker portions (40) have: closed cross-sectional portions (42A) that are hollow and whose cross-sections, as sectioned along planes orthogonal to the vehicle longitudinal direction, are closed cross-sections, and flange portions (42B) that are plate-shaped and that are provided at lower sides of the closed cross-sectional portions (42A), and the underpanel (50) is joined to the flange portions (42B).
  4. The vehicle lower portion structure of claim 3, wherein: the flange portions (42B) have vertical wall portions (48C) extending in a vehicle vertical direction, and horizontal wall portions (48D) extending in the vehicle transverse direction from the vertical wall portions (48C), and the underpanel (50) is joined to the horizontal wall portions (48D).
  5. The vehicle lower portion structure according to any one of claims 1 to 4, wherein: the rocker portions (40) have rocker inners (41) and rocker outers (42) provided further toward vehicle transverse direction outer sides than the rocker inners (41), lower end portions of the rocker outers (42) are disposed further toward a vehicle lower side than lower end portions of the rocker inners (41), the accommodation portions (60) are provided at vehicle lower sides of the rocker inners (41) and at vehicle transverse direction inner sides of the rocker outers (42), and end portions of the underpanel (50) are joined to lower portions of the rocker outers (42).
  6. The vehicle lower portion structure of claim 5, wherein a bending rigidity of the rocker inners (41) is higher than a bending rigidity of the rocker outers (42).
  7. The vehicle lower portion structure of claim 5 or 6, wherein the joint portions (100) of the battery case (32) are provided further toward vehicle transverse direction inner sides than the rocker outers (42).
  8. The vehicle lower portion structure of claim 7, comprising joining members (90) that join the battery case (32) with the rocker inners (41), wherein: the joining members (90) are inserted, from a vehicle lower side, through through-holes formed in the underpanel (50), and a diameter of the through-holes is larger than a diameter of the joining members (90).
  9. The vehicle lower portion structure of claim 8, comprising rocker moldings (70) covering the underpanel (50) from vehicle transverse direction outer sides, wherein the joining members (90) also serve as mounting members that mount the rocker moldings (70) to the underpanel (50).
  10. The vehicle lower portion structure according to any one of claims 1 to 9, wherein the accommodated objects (62) have cables.
  11. The vehicle lower portion structure according to any one of claims 1 to 10, wherein the accommodation portions (60) are provided further toward vehicle transverse direction inner sides and a vehicle lower side than the joint portions (100).
  12. The vehicle lower portion structure according to any one of claims 1 to 11, wherein: the battery case (32) has an accommodation space definition portion (35A) that defines a battery accommodation space (S3) in which the battery cells (31) are accommodated, and projecting portions (35C) projecting toward vehicle transverse direction outer sides from the accommodation space definition portion (35A), and the joint portions (100) are provided at the projecting portions (35C).

Description

BACKGROUND Technical Field The present disclosure relates to a vehicle lower portion structure. Related Art Japanese Patent Application Laid-Open (JP-A) No. 2023-051652 discloses a vehicle in which a battery is installed in the lower portion of the vehicle. In this vehicle, a protruding portion that projects upwardly is provided at the vehicle transverse direction center of the case cover of the battery, and auxiliary machinery of the battery is accommodated in this protruding portion. Studies have been carried out on ensuring space for accommodation harnesses and the like at the lateral sides of a battery case, from the standpoint of enlarging the accommodation space at the lower portion of a vehicle. In this case, it is preferable that an accommodated object be protected from the rocker portion that moves toward the vehicle transverse direction inner side at the time of a side collision. SUMMARY In view of the above-described circumstances, an object of the present disclosure is to provide a vehicle lower portion structure that, in a vehicle in which accommodation portions are provided at the lateral sides of a battery case, can protect an accommodated object at the time of a side collision. A vehicle lower portion structure relating to a first aspect includes: a pair of rocker portions extending in a vehicle longitudinal direction and separated from one another in a vehicle transverse direction; a battery case that has joint portions joined to the rocker portions, and that is disposed between the pair of rocker portions, and in which battery cells are accommodated; an underpanel covering the battery case and the pair of rocker portions from a vehicle lower side; and accommodation portions provided between the battery case and the rocker portions, further toward vehicle transverse direction inner sides than the joint portions and at an upper side of the underpanel, wherein accommodated objects that extend in the vehicle longitudinal direction are accommodated in the accommodation portions. In the vehicle lower portion structure relating to the first aspect, the accommodation portions are provided between the battery case and the rocker portions. Due thereto, the accommodation space of the vehicle lower portion can be enlarged. Further, in the above-described structure, the accommodation portions are provided further toward the vehicle transverse direction inner sides than the joint portions of the rocker portions and the battery case. In a case in which a colliding body collides with a lateral side portion (in other words, a vehicle transverse direction outer side portion) of the vehicle (hereinafter called "at the time of a side collision"), the collision load is inputted to a rocker portion. The rocker portion to which load is inputted is pressed toward the vehicle transverse direction inner side, but the movement thereof toward the vehicle transverse direction inner side is suppressed at the joint portion. In this way, movement of the rocker portion toward the vehicle transverse direction inner side is suppressed at the joint portion that is provided further toward the vehicle transverse direction outer side than the accommodation portion, and therefore, deformation of the accommodation portion can be suppressed. Consequently, the accommodated object that is accommodated in the accommodation portion can be protected. Further, in the above-described structure, the underpanel covers the battery case and the rocker portions from the vehicle lower side, and the accommodation portions are provided between the battery case and the rocker portions. In this way, in the above-described structure, the vehicle transverse direction outer side end portions of the underpanel are positioned further toward the vehicle transverse direction outer sides than the accommodation portions. Due thereto, at the time of a side collision, the collision load is inputted to the underpanel before the accommodation portion. Some of the collision load is inputted to the underpanel in this way. Accordingly, the collision load at the time of a side collision is dispersed to the rocker portion and the underpanel, and it is difficult for the accommodation portion to deform. Accordingly, the accommodated object that is accommodated in the accommodation portion can be protected. In a vehicle lower portion structure relating to a second aspect, in the first aspect, the underpanel is joined to the rocker portions. In the vehicle lower portion structure relating to the second aspect, the underpanel is joined to the lower portions of the rocker portions. Due thereto, at the time of a side collision, movement of the rocker portion toward the vehicle transverse direction inner side is suppressed by the underpanel as well. Accordingly, it is more difficult for the rocker portion and the accommodation portion to interfere with one another. Consequently, deformation of the accommodation portion is suppressed more, and the accommodated object that i