Vehicle under structure

Abstract

The invention provides a vehicle lower structure. And inclined ribs are arranged on the bottom wall of the battery shell. The inclined rib transmits a collision load input from the front side of the vehicle to the side of the rocker, and transmits a collision load input from the rear side of the vehicle to the side of the rocker. That is to say, the inclined ribs are arranged on the bottom wall of the battery case, so that the transmission path of the collision load (so-called front collision load or so-called rear collision load) input from the front side or the rear side of the vehicle can be ensured.

Description

Technical Field

[0001] The present invention relates to a vehicle underbody structure. Background Art

[0002] In the pure electric vehicle described in CN114940214, a substantially rectangular parallelepiped-shaped battery accommodation space is formed by a space portion constituted by a pair of left and right sill beams (sometimes also referred to as lower side beams), a front transverse member, a rear transverse member, and a cooling plate. A plurality of batteries (battery packs) are accommodated in the battery accommodation space. Further, in this prior art, the floor of the vehicle is constituted by a cover that covers the upper surface of the battery pack. Summary of the Invention

[0003] However, in the above prior art, for example, in the case of a frontal collision of the vehicle (hereinafter referred to as "during a frontal collision of the vehicle"), when a frontal collision load (collision load) is input to a battery pack constituted by a plurality of batteries, there are concerns about the transmission path of the collision load.

[0004] In consideration of the above fact, an object of the present invention is to obtain a vehicle underbody structure that ensures a transmission path of a collision load during a frontal collision or a rear collision of the vehicle.

[0005] The vehicle underbody structure according to an aspect of the present invention includes: a battery pack configured to include an accommodation portion that houses single cells and a cover that closes the accommodation portion and constitutes the floor portion of the passenger compartment; a first rib provided on the bottom wall of the battery pack and configured to transmit a collision load input from the vehicle front side or the vehicle rear side to the side of the lower side beam, the lower side beam constituting a part of the vehicle skeleton and extending in the vehicle front-rear direction outside the battery pack in the vehicle width direction.

[0006] In the vehicle underbody structure according to the above aspect, it is configured to include a battery pack and a first rib. The battery pack is configured to include an accommodation portion and a cover. Single cells are housed in the accommodation portion. The cover closes the accommodation portion and constitutes the floor portion of the passenger compartment. In this way, since the cover that closes the accommodation portion of the battery pack constitutes the floor that constitutes the floor portion of the passenger compartment, there is no need to separately provide a floor panel, and thus the number of components can be reduced.

[0007] Here, the first rib is provided on the bottom wall of the battery pack. The lower side beam, which constitutes a part of the vehicle skeleton, extends in the vehicle front-rear direction outside the battery pack in the vehicle width direction, and the first rib transmits a collision load input from the vehicle front side or the vehicle rear side to the side of the lower side beam.

[0008] That is, in the present invention, the collision load (so-called frontal collision load or so-called rear collision load) input from the vehicle front side or the vehicle rear side can be transmitted to the side sill side via the first rib. Thereby, the collision load caused by a frontal collision or a rear collision can be dispersed.

[0009] In the vehicle lower structure of the above-described manner, the first rib is provided outside the accommodation portion and is connected to a first joint portion that joins the battery pack side and the side sill.

[0010] In the vehicle lower structure of the above-described manner, by providing the first rib outside the accommodation portion, compared with the case where the first rib is provided inside the accommodation portion, the volume inside the accommodation portion can be increased, and thus the battery capacity can be increased. In addition, the first rib is connected to the first joint portion that joins the battery pack side and the side sill. Since the first joint portion has higher rigidity than other portions, the collision load transmitted through the first rib can be reliably transmitted to the side sill side via the first joint portion.

[0011] Here, the meaning of the "battery pack side" joined to the side sill is that, in addition to the case where the side sill and the battery pack are directly joined, it also includes other components integrated with the battery pack such as a bracket for joining to the side sill and a bottom cover provided on the lower side of the battery cover. In addition, the meaning of the first rib being "connected" to the first joint portion is that, in addition to the case where the first rib is integrally joined to the first joint portion by screwing or the like, it also includes the case where the first joint portion is provided near the first rib and on the substantially extended line of the first rib.

[0012] In the vehicle lower structure related to the above-described manner, on the vehicle front side or the vehicle rear side, a second joint portion that joins a transverse member extending in the vehicle width direction and the first rib side and a third joint portion that joins a frame member extending in the vehicle longitudinal direction and the transverse member are provided at positions that substantially overlap in the vehicle width direction when viewed from above.

[0013] In the vehicle lower structure of the above-described manner, on the vehicle front side or the vehicle rear side, the transverse member extends in the vehicle width direction. The transverse member is joined to the first rib side via the second joint portion. In addition, a frame member extending in the vehicle longitudinal direction is joined to the transverse member via the third joint portion. Here, the second joint portion and the third joint portion are provided at positions that substantially overlap in the vehicle width direction when viewed from above.

[0014] For example, during a frontal collision of the vehicle, the input frontal collision load is input to the front longitudinal beam as a frame member. Since the front longitudinal beam is joined to the transverse member via the third joint portion, the frontal collision load input to the front longitudinal beam is transmitted to the transverse member via the third joint portion.

[0015] In the present invention, a second joint portion that joins the lateral member to the first rib side is provided at a position that substantially overlaps with the third joint portion in the vehicle width direction when viewed from above. Therefore, the frontal collision load transmitted to the lateral member via the front longitudinal member and the third joint portion can be effectively transmitted to the lower side member via the second joint portion and the first rib.

[0016] Here, the meaning of the "first rib side" joined to the lateral member means that in addition to the case where the lateral member is directly joined to the first rib, it also includes other components integrated with the battery pack provided with the first rib, such as brackets and bottom covers used for joining to the lateral member.

[0017] In the vehicle lower structure of the above-described manner, a second rib is provided outside the accommodation portion in the bottom wall of the battery pack to transmit the collision load input in the vehicle width direction to the lower side member on the opposite side.

[0018] In the vehicle lower structure according to the above-described manner, a second rib is provided outside the accommodation portion in the bottom wall of the battery pack. Through this second rib, the collision load input in the vehicle width direction can be transmitted to the lower side member on the opposite side.

[0019] In the vehicle lower structure according to the above-described manner, the first rib is connected to the second rib.

[0020] In the vehicle lower structure according to the above-described manner, by connecting the first rib and the second rib, the collision load transmitted to the first rib can be transmitted to the lower side member and the second rib via the first rib, thereby effectively dispersing the collision load.

[0021] Here, the meaning of the first rib and the second rib being "connected" means that in addition to the case where the first rib and the second rib are integrally joined by screwing, welding, etc., it also includes the case where the first rib and the second rib are joined via other components such as brackets.

[0022] As described above, in the vehicle lower structure according to the present invention, a transmission path for the collision load can be ensured during a frontal collision or a rear collision of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, features, advantages, techniques, and industrial significance of exemplary embodiments of the present invention will be described with reference to the drawings, in which the same reference numerals denote the same elements, and wherein:

[0024] Figure 1 is a perspective view showing the configuration of a vehicle to which the vehicle lower structure according to the present embodiment is applied, as viewed from the upper left oblique side;

[0025] Figure 2The bottom view showing the configuration of a vehicle to which the vehicle lower structure according to the present embodiment is applied and showing a state in which a part is omitted;

[0026] Figure 3 The schematic cross-sectional view when cut along line III-III of Figure 1 ; and

[0027] Figure 4 The schematic cross-sectional view when cut along line IV-IV of Figure 1 . Detailed Embodiment

[0028] The vehicle lower structure according to the embodiment of the present invention will be described with reference to the drawings. In addition, the arrow marks FR, UP, and LH appropriately shown in each figure respectively indicate the front (travel direction), upward, and leftward directions of a vehicle to which the vehicle lower structure according to the present embodiment is applied. Hereinafter, when only the front-rear, left-right, and up-down directions are used for description, unless otherwise specified, the front-rear indicates the vehicle front-rear direction, the left-right indicates the vehicle left-right direction (vehicle width direction), and the up-down indicates the vehicle up-down direction. In addition, in each figure, in order to facilitate the observation of the drawings, sometimes the illustration of a part of the components and a part of the symbols is omitted.

[0029] Configuration of Vehicle Lower Structure

[0030] First, the configuration of the vehicle lower structure according to the embodiment of the present invention will be described.

[0031] As Figure 1 shown, a vehicle (body) 12 to which the vehicle lower structure 10 according to the present embodiment is applied includes: a pair of left and right lower side members 16 and 18, which respectively constitute the vehicle frame and extend in the vehicle front-rear direction at the lower ends of both ends in the vehicle width direction of the passenger compartment 14 (see Figure 3 ); a front transverse member (transverse member) 20, which is provided in the vehicle width direction at the front ends of the lower side members 16 and 18; and a rear transverse member (transverse member) 22, which is provided in the vehicle width direction at the rear ends of the left and right lower side members 16 and 18.

[0032] At both ends in the vehicle width direction of the front transverse member 20, they are respectively joined to the rear ends of the front longitudinal beams 24 extending in the vehicle front-rear direction via joints (third joints) 19 and 21 achieved by screwing, welding, etc. In addition, at both ends in the vehicle width direction of the rear transverse member 22, they are respectively joined to the front ends of the rear longitudinal beams 26 extending in the vehicle front-rear direction via joints (third joints) 23 and 25 achieved by screwing, welding, etc.

[0033] The vehicle 12 according to this embodiment is, for example, a battery electric vehicle (BEV) that travels using the driving force of an electric motor (not shown). A battery pack 30 that houses a plurality of single cells 28 for supplying driving power to the electric motor is provided below the vehicle 12. In addition, the vehicle 12 may also be a plug-in hybrid electric vehicle (PHEV) or a fuel cell electric vehicle (FCEV).

[0034] Here, the configuration of the battery pack, which is a part of the vehicle lower structure according to this embodiment, will be described.

[0035] As Figure 1 shown, the vehicle lower structure 10 according to this embodiment includes a battery pack 30. The battery pack 30 is made of a light metal such as aluminum alloy, and is configured to include a battery housing 32 that is rectangular with the vehicle front-rear direction as the long side direction in a top view and has an upper side opening. In addition to metals, resin components such as carbon fiber reinforced plastic (CFRP) and glass fiber reinforced plastic (GFRP) may also be used. The same applies to the lid 48 and the bottom lid 60 described later.

[0036] The battery housing 32 that forms the main body of the battery pack 30 is configured to include a bottom wall 34, a front wall 36 erected from the front end of the bottom wall 34 in the vehicle front-rear direction, a rear wall 38 opposed to the front wall 36 and erected from the rear end of the bottom wall 34 in the vehicle front-rear direction, and a pair of side walls 40, 42 erected from both ends of the bottom wall 34 in the vehicle width direction and opposed to each other.

[0037] In this embodiment, for example, the distance between the front wall 36 and the rear wall 38 of the battery housing 32 is formed to be slightly narrower than the distance between the front cross member 20 and the rear cross member 22. In addition, the distance between the side walls 40 and 42 of the battery housing 32 is formed to be slightly narrower than the distance between the lower side members 16 and 18. Thus, the battery housing 32 in this embodiment is configured to be able to be disposed within the space surrounded by the lower side members 16, 18, the front cross member 20, and the rear cross member 22 that form the vehicle skeleton.

[0038] In addition, within the accommodation portion 44 of the battery housing 32 formed by the bottom wall 34, the front wall 36, the rear wall 38, and the side walls 40, 42, a plurality of thin plate-shaped single cells 28 that are substantially rectangular with the vehicle width direction as the long side direction are accommodated. The single cells 28 are arranged in the vehicle front-rear direction. In addition, although the accommodation portion 44 is formed of one space here, the accommodation portion 44 may also be divided into a plurality of spaces.

[0039] In addition, the accommodating portion 44 of the battery case 32 is closed by a cover 48 that is in the shape of a rectangular plate when viewed from above in a state where a plurality of single cells 28 are accommodated. The cover 48 is made of a light metal such as aluminum alloy, for example, is in the shape of a plate with the vehicle's vertical direction as the plate thickness direction, and is integrated with the battery case 32 by welding or the like. The cover 48 forms the floor portion of the passenger compartment 14 (see Figure 3 ). In addition, the front wall 36 and the rear wall 38 may be respectively integrated with the front cross member 20 and the rear cross member 22, and further, the side walls 40 and 42 may be respectively integrated with the lower side members 16 and 18.

[0040] Here, as Figure 2 shown, in the present embodiment, prismatic inclined ribs (first ribs) 50, 52, 54, 56 and transverse ribs (second ribs) 58, 59 are respectively protrudingly provided outside the accommodating portion 44 in the bottom wall 34 of the battery case 32. The transverse ribs 58, 59 are provided on the central portion side in the vehicle front-rear direction in the battery case 32, extend respectively in the vehicle width direction in the battery case 32, and are arranged at intervals from each other.

[0041] The inclined ribs 50, 52 are provided on the front portion side in the vehicle front-rear direction in the battery case 32. The inclined ribs 50, 52 are inclined and arranged in a direction in which they are separated from each other as they tend toward the rear side in the vehicle front-rear direction. The rear end portions of the inclined ribs 50, 52 are respectively joined to the transverse rib 58 via joints 53, 51 achieved by screwing, welding, or the like.

[0042] On the other hand, the inclined ribs 54, 56 are provided on the rear portion side in the vehicle front-rear direction in the battery case 32. The inclined ribs 54, 56 are inclined and arranged in a direction in which they are separated from each other as they tend toward the front side in the vehicle front-rear direction. The front end portions of the inclined ribs 54, 56 are respectively joined to the transverse rib 59 via joints 57, 55 achieved by screwing, welding, or the like.

[0043] A bottom cover 60 is disposed on the lower side of the inclined ribs 50, 52, 54, 56 or the like and is arranged substantially parallel to the bottom wall 34 of the battery case 32. The bottom cover 60 is made of a light metal such as aluminum alloy, for example, is in the shape of a plate with the vehicle's vertical direction as the plate thickness direction, and has a function of preventing interference with the road surface.

[0044] As Figure 2 , Figure 3 shown, the front end portion 60A of the bottom cover 60 is joined to the lower wall 20A of the front cross member 20 via joints (second joints) 72, 74 achieved by screwing, welding, or the like. In addition, Figure 3 is a cross-sectional view taken along line III-III as shown in Figure 1 .

[0045] In the present embodiment, the joint portion 72 is provided on a substantially extended line of the inclined rib 50, and the joint portion 74 is provided on a substantially extended line of the inclined rib 52. In addition, the front end portions of the inclined ribs 50 and 52 may of course be directly joined to the lower wall 20A of the front transverse member 20 via the joint portions 72 and 74, respectively.

[0046] In addition, in the present embodiment, the joint portions 72 and 74 that join the bottom cover 60 to the front transverse member 20 and the joint portions 19 and 21 that join the front transverse member 20 to the front longitudinal beam 24 are respectively provided at positions that substantially overlap in the vehicle width direction when viewed from above.

[0047] On the other hand, the rear end portion 60B of the bottom cover 60 is joined to the lower wall 22A of the rear transverse member 22 via joint portions (second joint portions) 76 and 78 achieved by screwing, welding, etc. In the present embodiment, the joint portion 76 is provided on a substantially extended line of the inclined rib 54, and the joint portion 78 is provided on a substantially extended line of the inclined rib 56. In addition, similar to the joint portions 72 and 74, the rear end portions of the inclined ribs 54 and 56 may of course be directly joined to the lower wall 22A of the rear transverse member 22 via the joint portions 76 and 78, respectively.

[0048] In addition, in the present embodiment, the joint portions 76 and 78 that join the bottom cover 60 to the rear transverse member 22 and the joint portions 23 and 25 that join the rear transverse member 22 to the rear longitudinal beam 26 are respectively provided at positions that substantially overlap in the vehicle width direction when viewed from above.

[0049] Furthermore, one end portion 60C in the vehicle width direction of the bottom cover 60 is joined to the lower wall 16B of the lower side member 16 via joint portions (first joint portions) 80 and 82 achieved by screwing, welding, etc. In addition, the other end portion 60D in the vehicle width direction of the bottom cover 60 is joined to the lower wall 18B of the lower side member 18 via joint portions (first joint portions) 84 and 86 in the same manner as the one end portion 60C (see Figure 4 ). That is, in the present embodiment, the inclined ribs 50, 52, 54, 56 and the transverse ribs 58, 59 are arranged between the lower side member 16 and the lower side member 18. In addition, Figure 4 For a cross-sectional view taken along the line Ⅳ-Ⅳ shown, since the lower side member 16 and the lower side member 18 are configured to be substantially the same, only the lower side member 18 side is shown as a representative of the two in Figure 1 . Figure 4 In

[0050] As shown in Figure 4As shown, the lower side beam 18 is provided with a closed cross-section structure having a closed cross-section portion 66 formed by an outer side portion 62 and an inner side portion 64. Inside the closed cross-section portion 66, a linearly formed EA portion (impact absorbing portion) 68 and a ladder-shaped EA portion 70 that span the outer side portion 62 and the inner side portion 64 are provided. In this way, by providing the EA portions 68 and 70 inside the closed cross-section portion 66 of the lower side beam 18, it is possible to absorb the side collision load input during a side collision of the vehicle (so-called "during side collision") through plastic deformation or the like of the EA portions 68 and 70. In addition, the configuration and shape of the lower side beam 18 are merely examples and are not limited to this configuration and shape.

[0051] As Figure 2 shown, in the present embodiment, the joint portions 80 and 84 are provided on substantially the extension line of the lateral rib 58, and the joint portion 80 is provided on substantially the extension line of the inclined rib 50, and the joint portion 84 is provided on substantially the extension line of the inclined rib 52. In addition, the joint portions 82 and 86 are provided on substantially the extension line of the lateral rib 59, and the joint portion 82 is provided on substantially the extension line of the inclined rib 54, and the joint portion 86 is provided on substantially the extension line of the inclined rib 56.

[0052] That is to say, in the present embodiment, the joint portion 80 is provided near the joint portion 53 of the inclined rib 50 and the lateral rib 58, and the joint portion 84 is provided near the joint portion 51 of the inclined rib 52 and the lateral rib 58. In addition, the joint portion 82 is provided near the joint portion 57 of the inclined rib 54 and the lateral rib 59, and the joint portion 86 is provided near the joint portion 55 of the inclined rib 56 and the lateral rib 59.

[0053] In the above embodiment, the inclined ribs 50 and 52 and the lateral rib 58 etc. project outwardly from the bottom wall 34 of the battery housing 32 into the accommodating portion 44. However, in the present invention, during a frontal collision or a rear collision of the vehicle, as long as a transmission path for the collision load can be ensured, although not shown, the inclined ribs 50 and 52 and the lateral rib 58 etc. may also project inwardly into the accommodating portion 44.

[0054] Functions and effects of the vehicle lower structure

[0055] Next, the functions and effects of the vehicle lower structure according to the present embodiment will be described.

[0056] As Figure 1 , Figure 2As shown, in the present embodiment, the vehicle lower structure 10 is configured to include a battery case 32 and inclined ribs 50, 52, 54, 56. The battery case 32 is configured to include a housing portion 44 and a lid 48. In the housing portion 44, the single cells 28 are accommodated in a state of extending in the vehicle width direction and arranged in the vehicle longitudinal direction. The lid 48 closes the housing portion 44 and forms the floor portion of the passenger compartment 14.

[0057] In this way, in the present embodiment, the lid 48 that closes the housing portion 44 of the battery case 32 forms the floor of the floor portion that forms the passenger compartment 14, so that there is no need to separately provide a floor panel, and thus the number of components can be reduced.

[0058] Here, the inclined ribs 50, 52, 54, 56 are provided on the bottom wall 34 of the battery case 32. At the outer side in the vehicle width direction compared to the battery case 32, the lower side beams 16, 18 that form a part of the vehicle frame extend in the vehicle longitudinal direction. The inclined ribs 50, 52 transmit the collision load input from the vehicle front side to the lower side beam 16, 18 side, and the inclined ribs 54, 56 transmit the collision load input from the vehicle rear side to the lower side beam 16, 18 side.

[0059] That is to say, in the present embodiment, by providing the inclined ribs 50, 52 and the inclined ribs 54, 56 on the bottom wall 34 of the battery case 32, the transmission paths of the collision loads (so-called frontal collision load and so-called rear collision load) input from the vehicle front side and the vehicle rear side are respectively ensured, so that the collision load caused by a frontal collision or a rear collision can be dispersed.

[0060] In addition, in the present embodiment, the inclined ribs 50, 52, 54, 56 are provided outside the housing portion 44. Thus, in the present embodiment, compared with the case where the inclined ribs 50, 52, 54, 56 (not shown) are provided inside the housing portion 44, the volume inside the housing portion 44 can be increased, and thus the battery capacity can be increased. In addition, the inclined ribs 50, 52, 54, 56 may also be provided inside the housing portion 44. In this case, the rigidity of the battery case 32 itself can be improved.

[0061] Here, in the present embodiment, the inclined ribs 50, 52, 54, 56 provided on the bottom wall 34 of the battery case 32 are respectively connected to the joints (first joints) 80, 84, 82, 86 that connect the lower side beams 16, 18 and the battery case 32 side.

[0062] Specifically, the joint portion 80 is disposed on the substantially extended line of the inclined rib 50 near the joint portion 53 between the inclined rib 50 and the lateral rib 58. The joint portion 84 is disposed on the substantially extended line of the inclined rib 52 near the joint portion 51 between the inclined rib 52 and the lateral rib 58. In addition, the joint portion 82 is disposed on the substantially extended line of the inclined rib 54 near the joint portion 57 between the inclined rib 54 and the lateral rib 59. The joint portion 86 is disposed on the substantially extended line of the inclined rib 56 near the joint portion 55 between the inclined rib 56 and the lateral rib 59.

[0063] Generally, the rigidity of the joint portion for joining components is higher than that of other parts. Therefore, in the present embodiment, according to the above configuration, the collision load transmitted through the inclined ribs 50 and 54 can be effectively transmitted to the side sill 16 side via the joint portions 80 and 82. In addition, the collision load transmitted through the inclined ribs 52 and 56 can be effectively transmitted to the side sill 18 side via the joint portions 84 and 86.

[0064] Furthermore, in the present embodiment, on the front side and the rear side of the vehicle, the front cross member 20 and the rear cross member 22 extend in the vehicle width direction respectively. The front cross member 20 is joined to the bottom cover 60 via joint portions (second joint portions) 72 and 74. The front cross member 20 is joined to the front longitudinal member 24 via joint portions (third joint portions) 19 and 21.

[0065] Here, in the present embodiment, the joint portions (second joint portions) 72 and 74 are respectively disposed at positions that substantially overlap with the joint portions 19 and 21 in the vehicle width direction in a plan view. In addition, the rear cross member 22 side is the same as the front cross member 20.

[0066] For example, in a frontal collision of the vehicle, the input frontal collision load is input to the front longitudinal member 24 as a frame member. Since the front longitudinal member 24 is joined to the front cross member 20 via the joint portions 19 and 21, the frontal collision load input to the front longitudinal member 24 is transmitted to the front cross member 20 via the joint portions 19 and 21.

[0067] In the present embodiment, the joint portions 72 and 74 for joining the front cross member 20 and the bottom cover 60 are disposed at positions that substantially overlap with the joint portions 19 and 21 in the vehicle width direction in a plan view. Therefore, the frontal collision load transmitted to the front cross member 20 via the front longitudinal member 24 and the joint portions 19 and 21 can be effectively transmitted to the side sills 16 and 18 respectively via the joint portions 72 and 74 and the inclined ribs 50 and 52 provided on the bottom wall 34 of the battery case 32.

[0068] In addition, in the present embodiment, at the bottom wall of the battery housing 32, the lateral ribs 58 and 59 extend in the vehicle width direction of the battery housing 32 respectively. Since the lateral ribs 58 and 59 are disposed between the side sills 16 and 18, the collision load input in the vehicle width direction can be transmitted to the side sill side on the opposite side.

[0069] Furthermore, in the present embodiment, the inclined ribs 50 and 52 are connected to the lateral rib 58, and the inclined ribs 54 and 56 are connected to the lateral rib 59. Thus, in the present embodiment, the collision load transmitted from the vehicle front side to the inclined ribs 50 and 52 can be transmitted to the side sills 16 and 18 and the lateral rib 58 via the inclined ribs 50 and 52, so that the collision load can be effectively dispersed. In addition, in the present embodiment, the collision load transmitted from the vehicle rear side to the inclined ribs 54 and 56 can be transmitted to the side sills 16 and 18 and the lateral rib 59 via the inclined ribs 54 and 56, so that the collision load can be effectively dispersed.

[0070] Supplementary Note

[0071] In addition, the following configurations can be appropriately combined as the vehicle underbody structure according to the present invention.

[0072] Configuration 1

[0073] In the vehicle underbody structure, there is provided: a battery pack configured to include a housing portion that houses single cells and a lid that closes the housing portion and forms the floor portion of the passenger compartment; a first rib provided on the bottom wall of the battery pack and transmitting the collision load input from the vehicle front side or the vehicle rear side to the side sill side, the side sill forming a part of the vehicle skeleton and extending in the vehicle longitudinal direction outside the battery pack in the vehicle width direction.

[0074] Configuration 2

[0075] The first rib is provided outside the housing portion and is connected to a first coupling portion that couples the battery pack side and the side sill.

[0076] Configuration 3

[0077] On the vehicle front side or the vehicle rear side, a second coupling portion that couples a lateral member extending in the vehicle width direction with the first rib side and a third coupling portion that couples a skeleton member extending in the vehicle longitudinal direction with the lateral member are provided at positions that substantially overlap in the vehicle width direction when viewed from above.

[0078] Configuration 4

[0079] A second rib for transmitting a collision load input in the vehicle width direction to the lower side member side on the opposite side is provided outside the accommodation portion in the bottom wall of the battery pack.

[0080] Constitute 5

[0081] The first rib is connected to the second rib.

[0082] In addition, the present invention can be implemented with various modifications without departing from its gist. In addition, it is self-evident that the scope of rights of the present invention is not limited to the above-described embodiments.

Claims

1. A vehicle lower structure, comprising: A battery pack including a housing portion for housing a single battery and a cover for closing the housing portion and constituting a floor portion of a vehicle compartment; The first rib is provided on the bottom wall of the battery pack and transmits the collision load input from the front side or the rear side of the vehicle to the side of the lower side beam, which constitutes a part of the vehicle frame and extends in the front-rear direction of the vehicle at the outer side of the battery pack in the vehicle width direction.

2. The vehicle lower structure according to claim 1, wherein: The first rib is provided at an outer side of the accommodation portion and is connected to a first coupling portion coupling the battery pack side and the rocker.

3. The vehicle lower structure according to claim 1, wherein: On the vehicle front side or the vehicle rear side, a second joint portion that joins a cross member extending in the vehicle width direction with the first rib side and a third joint portion that joins a framework component extending in the vehicle front-rear direction with the cross member are arranged at positions that substantially overlap in the vehicle width direction when viewed from above.

4. The vehicle lower structure according to claim 1, wherein: A second rib is provided on the outer side of the accommodation portion in the bottom wall of the battery pack to transfer a collision load input in the vehicle width direction to the rocker side on the opposite side.

5. The vehicle lower structure according to claim 4, wherein: The first rib is connected to the second rib.

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