Vehicle undercarriage

Abstract

To provide a vehicle lower part structure in which a transmission path of a collision load is secured upon a front collision or rear collision of a vehicle.SOLUTION: Inclined ribs 50, 52, 54, and 56 are provided on a bottom wall 34 of a battery case 32. The inclined ribs 50 and 52 transmit a collision load input from a vehicle front side to sides of rockers 16 and 18, and the inclined ribs 54 and 56 transmit a collision load input from a vehicle rear side to the sides of the rockers 16 and 18. In other words, the inclined ribs 50, 52, 54, and 56 are provided on the bottom wall 34 of the battery case 32, and thereby, a transmission path of the collision load (so-called front collision load or so-called rear collision load) input from the vehicle front side or the vehicle rear side can be secured.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In the electric vehicle described in the following Patent Document 1, a substantially rectangular parallelepiped battery accommodation space is formed by a space portion configured by a pair of left and right side sill beams (sometimes referred to as rockers), a front cross member, a rear cross member, and a cooling plate, and a plurality of batteries (battery packs) are accommodated in this battery accommodation space. In this prior art, a vehicle floor is formed by a cover plate that covers the upper surface of the battery pack. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] CN114940214 A [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] However, in the above prior art, for example, when a front impact load (collision load) is input to a battery pack constituted by a plurality of batteries during a frontal collision of a vehicle (hereinafter referred to as "frontal vehicle collision"), there is concern regarding the transmission path of the collision load.

[0005] In view of the above facts, an object of the present invention is to provide a vehicle lower structure in which a transmission path for collision load is secured during a frontal collision or rear collision of a vehicle. [Means for Solving the Problem]

[0006] The vehicle understructure according to claim 1 comprises a battery pack comprising a housing portion containing battery cells and a cover that closes the housing portion and constitutes the floor of the passenger compartment, and a first rib provided on the bottom wall of the battery pack, which constitutes part of the vehicle frame and transmits collision loads input from the front or rear of the vehicle to the rocker side which extends along the longitudinal direction of the vehicle on the outside of the vehicle width direction from the battery pack. The second joint, to which the cross member extending in the vehicle width direction on the front or rear side of the vehicle is connected to the first rib side, and the third joint, to which the skeletal member extending in the vehicle longitudinal direction is connected to the cross member, are provided in positions that substantially overlap in the vehicle width direction when viewed from above.

[0007] The vehicle understructure according to claim 1 includes a battery pack and a first rib. The battery pack includes a housing and a cover, and the housing houses battery cells. The cover closes the housing and forms the floor of the vehicle compartment. In this way, the floor of the vehicle compartment is formed by the cover that closes the housing of the battery pack, so there is no need to provide a separate floor panel, and thus the number of parts can be reduced.

[0008] Here, the first rib is provided on the bottom wall of the battery pack. Outward from the battery pack in the vehicle width direction, a rocker, which constitutes part of the vehicle frame, extends along the vehicle's longitudinal direction, and the first rib transmits the collision load input from the front or rear of the vehicle to the rocker.

[0009] In other words, in the present invention, collision loads (so-called frontal collision loads or so-called rearward collision loads) input from the front or rear of the vehicle can be transmitted to the rocker side via the first rib, thereby making it possible to distribute the collision load caused by a frontal collision or rearward collision. Furthermore, in this invention, a cross member extends in the vehicle width direction on either the front or rear side of the vehicle. This cross member and the first rib side are connected via a second joint. In addition, a skeletal member extending in the vehicle longitudinal direction and the cross member are connected via a third joint. Here, the second joint and the third joint are provided in positions that substantially overlap in the vehicle width direction in a plan view. For example, in the event of a vehicle collision, the impact load is applied to the front side member, which acts as a structural component. Since the front side member is connected to the cross member via a third joint, the impact load applied to the front side member is transmitted to the cross member via the third joint. In this invention, the second joint, to which the cross member and the first rib are connected, is provided at a position that substantially overlaps with the third joint in the vehicle width direction in a plan view. Therefore, the forward thrust load transmitted to the cross member via the front side member and the third joint can be efficiently transmitted to the rocker via the second joint and the first rib. Here, "first rib side" which is connected to the cross member means that, in addition to the case where the cross member and the first rib are directly connected, it also includes other components that are integrated into the battery pack on which the first rib is provided, such as brackets for connecting to the cross member and undercovers.

[0010] The vehicle understructure according to claim 2 is the vehicle understructure according to claim 1, wherein the first rib is provided on the outside of the housing portion and is connected to a first coupling portion to which the battery pack side and the rocker are coupled.

[0011] In the vehicle understructure according to claim 2, the first rib is provided on the outside of the housing, which increases the volume inside the housing compared to when the first rib is provided inside the housing, and thus increases the battery capacity. Furthermore, the first rib is connected to a first coupling portion to which the battery pack side and the rocker are coupled. Since the first coupling portion has higher rigidity than other parts, it is possible to reliably transmit the collision load transmitted by the first rib to the rocker side via the first coupling portion.

[0012] Here, "battery pack side" connected to the rocker means, in addition to cases where the rocker and the battery pack are directly connected, other components integrated with the battery pack, such as brackets for connecting to the rocker and undercovers provided on the lower side of the battery cover. Furthermore, "the first rib is connected to the first joint" means, in addition to cases where the first rib is integrally connected to the first joint by bolts or the like, the first joint is provided in the vicinity of the first rib on approximately the extension of the first rib.

[0018] Claim 3 The vehicle understructure according to the invention described above is the vehicle understructure according to claim 1, wherein a second rib is provided on the outside of the housing portion in the bottom wall of the battery pack to transmit the collision load input along the vehicle width direction to the rocker side on the opposite side.

[0019] Claim 3 In the vehicle understructure according to the invention described above, the housing portion in the bottom wall of the battery pack A second rib is provided on the outside. This second rib makes it possible to transmit the collision load applied along the vehicle width direction to the rocker on the opposite side.

[0022] Here, as the joining mode of the first rib and the second rib, in addition to the case where the first rib and the second rib are integrally joined by bolts, welding or the like, it also includes the case where the first rib and the second rib are joined via a separate member such as a bracket. Claim 4 The vehicle lower structure according to the invention described in [the preceding claim] is the vehicle lower structure according to the invention of claim 3, wherein the first rib and the second rib are joined by welding. Claim 4 In the vehicle lower structure according to the invention described in [the preceding claim], the first rib and the second rib are joined by welding, whereby the collision load transmitted to the first rib can be transmitted to the rocker and the second rib via the first rib, and the collision load can be effectively dispersed. Claim 5 The vehicle lower structure according to the invention described in [the preceding claim] is the vehicle lower structure according to the invention of claim 3, wherein the first rib and the second rib are joined by bolt fastening. Claim 5 In the vehicle lower structure according to the invention described in [the preceding claim], the first rib and the second rib are joined by bolt fastening, whereby the collision load transmitted to the first rib can be transmitted to the rocker and the second rib via the first rib, and the collision load can be effectively dispersed. [Advantageous Effects of Invention]

[0023] As explained above, in the vehicle lower structure according to the present invention, a transmission path for collision load can be secured during a frontal collision or rear collision of the vehicle. [Brief Description of the Drawings]

[0024] [Figure 1] It is a perspective view seen from the diagonally upper left side showing the configuration of a vehicle to which the vehicle lower structure according to the present embodiment is applied. [Figure 2] It is a bottom view showing a partially cut-out state of the configuration of a vehicle to which the vehicle lower structure according to the present embodiment is applied. [Figure 3] It is a schematic cross-sectional view taken along line A-A in FIG. 1. [Figure 4]This is a schematic cross-sectional view taken along line BB in Figure 1. [Modes for carrying out the invention]

[0025] A vehicle understructure according to an embodiment of the present invention will be described with reference to the drawings. The arrows FR, UP, and LH shown in each figure indicate the forward (direction of travel), upward, and leftward directions, respectively, of the vehicle to which the vehicle understructure according to this embodiment is applied. Hereafter, when simply referring to the front / rear, left / right, and up / down directions, unless otherwise specified, these refer to the front / rear of the vehicle's front-rear direction, the left / right of the vehicle's left-right direction (vehicle width direction), and the up / down of the vehicle's up / down direction. Furthermore, in each figure, some components and some reference numerals may be omitted for the sake of clarity.

[0026] (Vehicle understructure configuration) First, the configuration of the vehicle understructure according to the embodiment of the present invention will be described.

[0027] As shown in Figure 1, the vehicle (body) 12 to which the vehicle understructure 10 according to this embodiment is applied comprises a pair of left and right rockers 16 and 18 that constitute the vehicle frame and extend along the vehicle longitudinal direction at the lower ends of both ends in the vehicle width direction of the passenger compartment 14 (see Figure 3), a front cross member (cross member) 20 provided along the vehicle width direction at the front ends of the rockers 16 and 18, and a rear cross member (cross member) 22 provided along the vehicle width direction at the rear ends of the left and right rockers 16 and 18.

[0028] The rear ends of front side members 24, which extend along the vehicle's longitudinal direction, are connected to both ends of the front cross member 20 in the vehicle width direction via bolts, welds, or other connecting parts (third connecting parts) 19 and 21, respectively. The front ends of rear side members 26, which extend along the vehicle's longitudinal direction, are connected to both ends of the rear cross member 22 in the vehicle width direction via bolts, welds, or other connecting parts (third connecting parts) 23 and 25, respectively.

[0029] The vehicle 12 according to this embodiment is, for example, an electric vehicle (BEV) that runs using the driving force of an electric motor (not shown), and a battery pack 30 containing a plurality of battery cells 28 that supply power for driving the electric motor is provided at the bottom of the vehicle 12. The vehicle 12 may also be a plug-in hybrid vehicle (PHEV) or a fuel cell vehicle (FCEV), etc.

[0030] Here, we will describe the configuration of the battery pack, which constitutes a part of the vehicle understructure according to this embodiment.

[0031] As shown in Figure 1, the vehicle understructure 10 according to this embodiment includes a battery pack 30. The battery pack 30 is made of a light metal such as an aluminum alloy, and includes a box-shaped battery case 32 that is rectangular in shape with the vehicle's front-rear direction as its longitudinal direction in a plan view and has an opening at the top. In addition to metal, resin materials such as carbon fiber reinforced plastic (CFRP) and glass fiber reinforced plastic (GFRP) may also be used. The same applies to the cover 48 and under cover 60 described later.

[0032] The battery case 32 that constitutes the main body of the battery pack 30 includes a bottom wall 34, a front wall 36 erected from the front end of the bottom wall 34 in the vehicle's longitudinal direction, a rear wall 38 facing the front wall 36 and erected from the rear end of the bottom wall 34 in the vehicle's longitudinal direction, and a pair of side walls 40, 42 erected from both ends of the bottom wall 34 in the vehicle's width direction and facing each other.

[0033] In this embodiment, for example, the distance between the front wall 36 and the rear wall 38 of the battery case 32 is formed to be slightly narrower than the distance between the front cross member 20 and the rear cross member 22. Also, the distance between the side walls 40 and 42 of the battery case 32 is formed to be slightly narrower than the distance between the rockers 16 and 18. As a result, the battery case 32 in this embodiment can be placed within the space enclosed by the rockers 16, 18, the front cross member 20 and the rear cross member 22 that constitute the vehicle frame.

[0034] Furthermore, within the housing section 44 of the battery case 32, which is composed of the bottom wall 34, front wall 36, rear wall 38, and side walls 40 and 42, a plurality of thin, plate-shaped battery cells 28, which form a substantially rectangular shape with the vehicle width direction as the longitudinal direction, are housed, and these battery cells 28 are arranged along the front-rear direction of the vehicle. In this example, the housing section 44 is composed of a single space, but the housing section 44 may be divided into multiple sections.

[0035] Furthermore, the housing section 44 of the battery case 32 is covered by a cover 48 that forms a rectangular plate shape in plan view, while housing multiple battery cells 28. This cover 48 is made of a light metal such as aluminum alloy, has a plate shape with the plate thickness direction in the vertical direction of the vehicle, and is integrated with the battery case 32 by welding or the like, and the cover 48 constitutes the floor of the passenger compartment 14 (see Figure 3). The front wall 36 and rear wall 38 may be integrated with the front cross member 20 and rear cross member 22, respectively, and the side walls 40 and side walls 42 may be integrated with the rockers 16 and 18, respectively.

[0036] As shown in Figure 2, in this embodiment, prismatic inclined ribs (first ribs) 50, 52, 54, 56 and cross ribs (second ribs) 58, 59 are provided protruding from the outside of the housing portion 44 in the bottom wall 34 of the battery case 32. The cross ribs 58 and 59 are provided on the central side of the battery case 32 in the vehicle's longitudinal direction, extend along the vehicle's width direction, and are spaced apart from each other.

[0037] The inclined ribs 50 and 52 are provided on the front side of the battery case 32 in the vehicle's longitudinal direction. The inclined ribs 50 and 52 are arranged to be inclined so as they move toward the rear in the vehicle's longitudinal direction, and the rear ends of the inclined ribs 50 and 52 are connected to the cross rib 58, respectively, via connecting parts 53 and 51 made by bolts, welds, or the like.

[0038] On the other hand, the inclined ribs 54 and 56 are provided on the rear side of the battery case 32 in the vehicle's longitudinal direction. The inclined ribs 54 and 56 are arranged to be inclined so as they move further apart from each other toward the front of the vehicle in the longitudinal direction, and the front ends of the inclined ribs 54 and 56 are connected to the cross rib 59, respectively, via connecting parts 57 and 55 made by bolts, welds, etc.

[0039] Below the inclined ribs 50, 52, 54, 56, etc., an under cover 60 is provided, which is positioned approximately parallel to the bottom wall 34 of the battery case 32. This under cover 60 is made of a light metal such as aluminum alloy, has a plate-like shape with the plate thickness direction running in the vertical direction of the vehicle, and serves to prevent interference with the road surface.

[0040] As shown in Figures 2 and 3, the front end portion 60A of the under cover 60 is connected to the lower wall 20A of the front cross member 20 via connecting parts (second connecting parts) 72 and 74, which are formed by bolts, welding, etc. Figure 3 is a cross-sectional view taken along line AA shown in Figure 1.

[0041] In this embodiment, the connecting portion 72 is provided on approximately the extension line of the inclined rib 50, and the connecting portion 74 is provided on approximately the extension line of the inclined rib 52. Of course, the front ends of the inclined ribs 50 and 52 may also be directly connected to the lower wall 20A of the front cross member 20 via the connecting portions 72 and 74, respectively.

[0042] Furthermore, in this embodiment, the connecting portions 72 and 74, to which the under cover 60 and the front cross member 20 are joined, and the connecting portions 19 and 21, to which the front cross member 20 and the front side member 24 are joined, are provided in positions that substantially overlap in the vehicle width direction when viewed from above.

[0043] On the other hand, the rear end portion 60B of the under cover 60 is connected to the lower wall 22A of the rear cross member 22 via connecting portions (second connecting portions) 76 and 78, which are formed by bolts, welding, etc. In this embodiment, the connecting portion 76 is provided on approximately the extension line of the inclined rib 54, and the connecting portion 78 is provided on approximately the extension line of the inclined rib 56. It should be noted that, similar to the connecting portions 72 and 74, the rear ends of the inclined ribs 54 and 56 may also be directly connected to the lower wall 22A of the rear cross member 22 via connecting portions 76 and 78, respectively.

[0044] Furthermore, in this embodiment, the connecting portions 76 and 78, to which the under cover 60 and the rear cross member 22 are joined, and the connecting portions 23 and 25, to which the rear cross member 22 and the rear side member 26 are joined, are provided in positions that substantially overlap in the vehicle width direction when viewed from above.

[0045] Furthermore, one end 60C of the under cover 60 in the vehicle width direction is connected to the lower wall 16B of the rocker 16 via connecting parts (first connecting parts) 80 and 82 made by bolts, welding, etc. Similarly, the other end 60D of the under cover 60 in the vehicle width direction is connected to the lower wall 18B of the rocker 18 via connecting parts (first connecting parts) 84 and 86 made by bolts, welding, etc. (see Figure 4). In other words, in this embodiment, the inclined ribs 50, 52, 54, 56 and the cross ribs 58 and 59 are positioned between the rocker 16 and the rocker 18. Note that Figure 4 is a cross-sectional view taken along the BB line shown in Figure 1, but since the rocker 16 and the rocker 18 have substantially the same configuration, only the rocker 18 side is shown in Figure 4 as a representative of both.

[0046] As shown in Figure 4, the rocker 18 has a closed section structure with a closed section 66 composed of an outer section 62 and an inner section 64. Within the closed section 66, there is a linearly formed EA section (impact absorbing section) 68 that bridges the outer section 62 and the inner section 64, and a ladder-shaped EA section 70. By providing the EA sections 68 and 70 within the closed section 66 of the rocker 18, the plastic deformation of the EA sections 68 and 70 makes it possible to absorb the side impact load applied during a side collision of a vehicle (so-called "side impact"). Note that the configuration and shape of the rocker 18 are merely examples and are not limited to this configuration and shape.

[0047] As shown in Figure 2, in this embodiment, the connecting portions 80 and 84 are provided on approximately the extension of the cross rib 58, with connecting portion 80 provided on approximately the extension of the inclined rib 50 and connecting portion 84 provided on approximately the extension of the inclined rib 52. Furthermore, the connecting portions 82 and 86 are provided on approximately the extension of the cross rib 59, with connecting portion 82 provided on approximately the extension of the inclined rib 54 and connecting portion 86 provided on approximately the extension of the inclined rib 56.

[0048] In other words, in this embodiment, the joint portion 80 is provided near the joint portion 53 between the inclined rib 50 and the cross rib 58, and the joint portion 84 is provided near the joint portion 51 between the inclined rib 52 and the cross rib 58. Furthermore, the joint portion 82 is provided near the joint portion 57 between the inclined rib 54 and the cross rib 59, and the joint portion 86 is provided near the joint portion 55 between the inclined rib 56 and the cross rib 59.

[0049] In the embodiments described above, inclined ribs 50, 52, cross ribs 58, etc. are provided protruding from the outside of the housing portion 44 in the bottom wall 34 of the battery case 32. However, in the present invention, it is sufficient to secure a transmission path for the collision load during a frontal or rearward collision of the vehicle, so although not shown in the figures, inclined ribs 50, 52, cross ribs 58, etc. may also be provided protruding from the inside of the housing portion 44.

[0050] (Function and effect of the vehicle's understructure) Next, the operation and effects of the vehicle understructure according to this embodiment will be described.

[0051] As shown in Figures 1 and 2, in this embodiment, the vehicle understructure 10 is composed of a battery case 32 and inclined ribs 50, 52, 54, and 56. The battery case 32 is composed of a housing section 44 and a cover 48, and the housing section 44 houses battery cells 28 that extend along the vehicle width direction and are arranged along the vehicle longitudinal direction. The cover 48 closes the housing section 44 and constitutes the floor of the passenger compartment 14.

[0052] Thus, in this embodiment, the floor of the vehicle compartment 14 is formed by the cover 48 that closes the housing portion 44 of the battery case 32, eliminating the need to provide a separate floor panel and thus reducing the number of parts.

[0053] Here, the inclined ribs 50, 52, 54, and 56 are provided on the bottom wall 34 of the battery case 32. Rockers 16 and 18, which constitute part of the vehicle frame, extend outward from the battery case 32 in the vehicle width direction along the vehicle longitudinal direction. The inclined ribs 50 and 52 transmit collision loads input from the front of the vehicle to the rockers 16 and 18, and the inclined ribs 54 and 56 transmit collision loads input from the rear of the vehicle to the rockers 16 and 18.

[0054] In other words, in this embodiment, by providing inclined ribs 50, 52 and inclined ribs 54, 56 on the bottom wall 34 of the battery case 32, transmission paths for collision loads (so-called frontal collision loads and so-called rearward collision loads) input from the front and rear sides of the vehicle are secured, respectively, making it possible to distribute the collision load caused by a frontal or rearward collision.

[0055] Furthermore, in this embodiment, the inclined ribs 50, 52, 54, and 56 are provided on the outside of the housing section 44. As a result, in this embodiment, although not shown, the volume inside the housing section 44 can be increased compared to the case where the inclined ribs 50, 52, 54, and 56 are provided inside the housing section 44, and thus the battery capacity can be increased. Note that the inclined ribs 50, 52, 54, and 56 may also be provided inside the housing section 44, in which case the rigidity of the battery case 32 itself can be improved.

[0056] In this embodiment, the inclined ribs 50, 52, 54, and 56 provided on the bottom wall 34 of the battery case 32 are connected to the coupling parts (first coupling parts) 80, 84, 82, and 86, respectively, to which the battery case 32 and the rockers 16 and 18 are connected.

[0057] Specifically, the joint portion 80 is located near the joint portion 53 between the inclined rib 50 and the cross rib 58, approximately on the extension of the inclined rib 50, and the joint portion 84 is located near the joint portion 51 between the inclined rib 52 and the cross rib 58, approximately on the extension of the inclined rib 52. In addition, the joint portion 82 is located near the joint portion 57 between the inclined rib 54 and the cross rib 59, approximately on the extension of the inclined rib 54, and the joint portion 86 is located near the joint portion 55 between the inclined rib 56 and the cross rib 59, approximately on the extension of the inclined rib 56.

[0058] Generally, joints where members are connected have higher rigidity than other parts. Therefore, in this embodiment, the above configuration makes it possible to reliably transmit the collision load transmitted by the inclined ribs 50 and 54 via the joints 80 and 82 to the rocker 16 side. In addition, it makes it possible to reliably transmit the collision load transmitted by the inclined ribs 52 and 56 via the joints 84 and 86 to the rocker 18 side.

[0059] Furthermore, in this embodiment, the front cross member 20 and the rear cross member 22 extend in the vehicle width direction, respectively, on the front and rear sides of the vehicle. The front cross member 20 and the under cover 60 are connected via connecting parts (second connecting parts) 72 and 74, and the front cross member 20 and the front side member 24 are connected via connecting parts (third connecting parts) 19 and 21.

[0060] In this embodiment, the connecting portions (second connecting portions) 72 and 74 are provided in positions that substantially overlap with the connecting portions 19 and 21 in the vehicle width direction when viewed from above. The rear cross member 22 is the same as the front cross member 20.

[0061] For example, in the event of a frontal collision, the impact load is applied to the front side member 24, which acts as a structural member. Since the front side member 24 is connected to the front cross member 20 via connecting parts 19 and 21, the impact load applied to the front side member 24 is transmitted to the front cross member 20 via these connecting parts 19 and 21.

[0062] In this embodiment, the connecting portions 72 and 74 to which the front cross member 20 and the under cover 60 are connected are positioned to substantially overlap with the connecting portions 19 and 21 in the vehicle width direction in a plan view. Therefore, the forward thrust load transmitted to the front cross member 20 via the front side member 24 and the connecting portions 19 and 21 can be efficiently transmitted to the rockers 16 and 18, respectively, via the connecting portions 72 and 74 and the inclined ribs 50 and 52 provided on the bottom wall 34 of the battery case 32.

[0063] Furthermore, in this embodiment, cross ribs 58 and 59 extend from the bottom wall of the battery case 32 along the vehicle width direction of the battery case 32. Since these cross ribs 58 and 59 are positioned between the rockers 16 and 18, it is possible to transmit the collision load input along the vehicle width direction to the rocker on the opposite side.

[0064] Furthermore, in this embodiment, the inclined ribs 50 and 52 are connected to the cross rib 58, and the inclined ribs 54 and 56 are connected to the cross rib 59. As a result, in this embodiment, the collision load transmitted from the front of the vehicle to the inclined ribs 50 and 52 can be transmitted via the inclined ribs 50 and 52 to the rockers 16 and 18 and the cross rib 58, thereby effectively distributing the collision load. Also, in this embodiment, the collision load transmitted from the rear of the vehicle to the inclined ribs 54 and 56 can be transmitted via the inclined ribs 54 and 56 to the rockers 16 and 18 and the cross rib 59, thereby effectively distributing the collision load.

[0065] <Note> Furthermore, the following configurations may be combined as appropriate to form the vehicle understructure according to the present invention.

[0066] (Composition 1) The vehicle understructure comprises a battery pack comprising a housing portion containing battery cells and a cover that closes the housing portion and forms the floor of the passenger compartment, and a first rib provided on the bottom wall of the battery pack, which transmits collision loads input from the front or rear of the vehicle to a rocker that forms part of the vehicle frame and extends along the longitudinal direction of the vehicle, outside the vehicle width direction of the battery pack. 、 The second joint, to which the cross member extending in the vehicle width direction is connected to the first rib side, and the third joint, to which the skeletal member extending in the vehicle longitudinal direction is connected to the cross member, are provided in positions that substantially overlap in the vehicle width direction when viewed from above. .

[0067] (Configuration 2) The first rib is provided on the outside of the housing and is connected to a first coupling portion to which the battery pack side and the rocker are coupled.

[0068] (Composition 3) On the outside of the housing portion in the bottom wall of the battery pack, there is a second rib that transmits the collision load applied along the vehicle width direction to the rocker side on the opposite side. It is provided.

[0069] (Composition 4) The first rib and the second rib are joined together by welding.

[0070] (Composition 5) The first rib and the second rib are joined together by bolts.

[0071] Furthermore, the present invention can be implemented with various modifications without departing from its spirit. Of course, the scope of the present invention is not limited to the embodiments described above. [Explanation of Symbols]

[0072] 10. Vehicle understructure 12 vehicles 14 Cabin 16 Rocka 18 Rocca 19 Joint part (3rd joint part) 20 Front cross member (cross member) 21 Joint part (3rd joint part) 22 Rear cross member (cross member) 23 Joint part (3rd joint part) 24 Front side member (framework component) 25 Joint part (3rd joint part) 26. Rear side member (framework component) 28 battery cells 30 Battery Packs 34 Bottom wall 44 containment section 48 Cover 50 Inclined rib (1st rib) 52 Inclined rib (1st rib) 54 Inclined rib (1st rib) 56 Inclined rib (1st rib) 58 Cross Rib (Second Rib) 59 Cross Rib (Second Rib) 72 Joint part (second joint part) 74 Joint part (second joint part) 76 Joint part (second joint part) 78 Joint part (second joint part) 80 Joint part (1st joint part) 82 Joint part (1st joint part) 84 Joint part (1st joint part) 86 Joint part (1st joint part)

Claims

1. A battery pack comprising a housing section containing battery cells, and a cover that closes the housing section and forms part of the floor of the vehicle compartment, A first rib is provided on the bottom wall of the battery pack, which transmits collision loads input from the front or rear of the vehicle to the rocker side, which constitutes part of the vehicle frame and extends along the longitudinal direction of the vehicle, outside the vehicle width direction of the battery pack. Equipped with, A vehicle understructure comprising a second joint, to which a cross member extending in the vehicle width direction is connected to the first rib side, and a third joint, to which a skeletal member extending in the vehicle longitudinal direction is connected to the cross member, located at positions that substantially overlap in the vehicle width direction in a plan view.

2. The vehicle understructure according to claim 1, wherein the first rib is provided on the outside of the housing portion and is connected to a first coupling portion to which the battery pack side and the rocker are coupled.

3. The vehicle understructure according to claim 1, wherein a second rib is provided on the outside of the housing portion in the bottom wall of the battery pack to transmit the collision load input along the vehicle width direction to the rocker side on the opposite side.

4. The vehicle understructure according to claim 3, wherein the first rib and the second rib are joined by welding.

5. The vehicle understructure according to claim 3, wherein the first rib and the second rib are joined by bolt fastening.

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