Vehicle lower part structure

Abstract

To provide a vehicle lower part structure that is able to prevent a collision load in a vehicle width direction from being input to a battery cell in a battery pack, by managing a deformation mode of a rocker.SOLUTION: A vehicle 10 includes: a battery pack 14 including a battery cell 41 therein and disposed on a vehicle lower side with respect to a cabin 16; a rocker 22 disposed outside the battery pack 14 in a vehicle width direction and extending in vehicle frontward and rearward directions; support portions 24 disposed as a pair at an interval in the vehicle frontward and rearward directions, at least a portion of each of the support portions being disposed between the battery pack 14 and the rocker 22 in the vehicle width direction as viewed from a vehicle vertical direction; and a battery cross member 42 extending in the vehicle width direction, located between the support portions 24 in the vehicle frontward and rearward directions, and having an end 42A located inside the support portions 24 in the vehicle width direction.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Patent Document 1 below discloses an invention related to a vehicle body underbody structure. In this vehicle body underbody structure, the battery pack and the rocker overlap when viewed in the vehicle width direction, and the rocker is provided with a shock absorption portion in which a gap portion extending in the vehicle longitudinal direction is formed. Then, when a collision load in the vehicle width direction is input, the peripheral portion of the gap portion in the shock absorption portion is crushed, thereby absorbing the collision load and suppressing the input of this collision load to the battery pack.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when a collision load in the vehicle width direction is input, depending on the deformation mode of the rocker, it is conceivable that this collision load is input to the battery cells in the battery pack.

[0005] In consideration of the above facts, an object of the present invention is to obtain a vehicle underbody structure capable of suppressing the input of a collision load in the vehicle width direction to the battery cells in the battery pack by controlling the deformation mode of the rocker.

Means for Solving the Problems

[0006] The vehicle underbody structure according to the first aspect includes a battery pack provided with battery cells inside and disposed below the vehicle compartment with respect to the vehicle compartment, a rocker disposed outside the battery pack in the vehicle width direction and extending in the vehicle longitudinal direction, and a pair of support portions disposed at least partially between the battery pack and the rocker in the vehicle width direction when viewed from the vehicle vertical direction and spaced apart from each other in the vehicle longitudinal direction, and a central skeleton portion extending in the vehicle width direction, positioned between the pair of support portions in the vehicle longitudinal direction, and having ends positioned closer to the inner side in the vehicle width direction than the pair of support portions.

[0007] According to the vehicle underbody structure according to the first aspect, a battery pack is disposed below the vehicle compartment with respect to the vehicle compartment, and this battery pack includes battery cells inside. Further, a rocker extending in the vehicle longitudinal direction is disposed outside the battery pack in the vehicle width direction. Therefore, when a collision load in the vehicle width direction is input, the collision load is input to the rocker prior to the battery pack.

[0008] By the way, when a collision load in the vehicle width direction is input, depending on the deformation mode of the rocker, it is conceivable that this collision load is input to the battery cells in the battery pack.

[0009] Here, in this aspect, a pair of support portions is provided, and at least a part of these support portions is disposed between the battery pack and the rocker in the vehicle width direction when viewed from the vehicle vertical direction, and they are spaced apart from each other in the vehicle longitudinal direction.

[0010] Further, a central skeleton portion extending in the vehicle width direction is positioned between the pair of support portions in the vehicle longitudinal direction, and the ends of this central skeleton portion are positioned closer to the inner side in the vehicle width direction than the pair of support portions.

[0011] Therefore, when a collision load in the vehicle width direction is input to the rocker, the rocker is supported by a pair of support portions, and when viewed from the vehicle vertical direction, it bends and deforms such that the vicinity of the center of the portion between the pair of support portions in the vehicle longitudinal direction becomes the apex. In this embodiment, the vicinity of the apex of the rocker deformed by receiving the collision load can be supported by the central frame portion, and as a result, transmission of the collision load to the battery cell side can be suppressed.

[0012] The vehicle lower structure according to the second aspect further includes a support frame portion that extends in the vehicle width direction inside the vehicle width direction of the support portion and is arranged so as to overlap the support portion when viewed from the vehicle width direction in the vehicle lower structure according to the first aspect.

[0013] According to the vehicle lower structure according to the second aspect, it includes a support frame portion. This support frame portion extends in the vehicle width direction inside the vehicle width direction of the support portion and is arranged so as to overlap the support portion when viewed from the vehicle width direction.

[0014] Therefore, in this embodiment, when a collision load in the vehicle width direction is input, a part of the load input to the support portion can be supported by the support frame portion.

[0015] The vehicle lower structure according to the third aspect is the vehicle lower structure according to the first aspect or the second aspect, wherein the central frame portion is a battery cross member provided in the battery pack.

[0016] According to the vehicle lower structure according to the third aspect, the vicinity of the apex of the rocker deformed by receiving a collision load in the vehicle width direction can be supported by a battery cross member provided in the battery pack. That is, in this embodiment, the collision load can also be supported by components within the battery pack.

[0017] The vehicle underbody structure according to the fourth aspect is the vehicle underbody structure according to the third aspect that cites the second aspect, wherein the rigidity of the support skeleton portion with respect to the load in the vehicle width direction is higher than the rigidity of the battery cross member with respect to the load.

[0018] According to the vehicle underbody structure according to the fourth aspect, as described above, when a collision load in the vehicle width direction is input to the rocker, a part of the load input from the rocker to the support portion is supported by the support skeleton portion.

[0019] By the way, depending on the rigidity of the support skeleton portion with respect to the collision load in the vehicle width direction, when the collision load is input to the rocker, it is conceivable that the rocker cannot maintain the state of being supported by the support skeleton portion and the entire rocker is pushed inward in the vehicle width direction.

[0020] Here, in this aspect, the rigidity of the support skeleton portion with respect to the load in the vehicle width direction is higher than the rigidity of the battery cross member with respect to the load. Therefore, when a load in the vehicle width direction is input, the probability that the load is supported by the support skeleton portion is increased, and as a result, the probability that the vicinity of the apex of the rocker that has been bent and deformed under the vehicle collision load is supported by the battery cross member can be increased.

[0021] The vehicle underbody structure according to the fifth aspect is the vehicle underbody structure according to any one of the first to fourth aspects, wherein the rocker is provided with a vulnerable portion having a lower rigidity with respect to a load in the vehicle width direction than the other portions of the rocker at a portion located between the support portions in the vehicle longitudinal direction.

[0022] According to the vehicle underbody structure according to the fifth aspect, a vulnerable portion is provided at a portion of the rocker located between the support portions in the vehicle longitudinal direction, and the vulnerable portion has a lower rigidity with respect to a load in the vehicle width direction than the other portions of the rocker. Therefore, in this aspect, when a collision load in the vehicle width direction is input to the rocker, the probability that the rocker deforms starting from the vulnerable portion can be increased, and the deformation mode of the rocker can be made easier to manage.

[0023] In the vehicle underbody structure according to the sixth aspect, in the vehicle underbody structure according to the fifth aspect, in the vehicle longitudinal direction, the arrangement position of the central skeleton portion and the arrangement position of the vulnerable portion are set at the same position.

[0024] According to the vehicle underbody structure according to the sixth aspect, in the vehicle longitudinal direction, the arrangement position of the central skeleton portion and the arrangement position of the vulnerable portion of the rocker are set at the same position, and the probability that the vicinity of the apex of the rocker deformed by receiving a collision load in the vehicle width direction is supported by the central skeleton portion can be increased.

[0025] The vehicle underbody structure according to the seventh aspect is the vehicle underbody structure according to any one of the first to sixth aspects, and further includes a load transmission member that is disposed in the rocker and can transmit a load in the vehicle width direction to the support portion.

[0026] According to the vehicle underbody structure according to the seventh aspect, a load transmission member is disposed in the rocker, and this load transmission member can transmit a load in the vehicle width direction to the support portion. Therefore, in this aspect, when a collision load in the vehicle width direction is input, even if the rocker is deformed by the collision load, a part of the collision load can be transmitted to the support portion via the load transmission member.

Advantages of the Invention

[0027] As described above, the vehicle underbody structure according to the present invention has an excellent effect that it is possible to suppress a collision load in the vehicle width direction from being input to the battery cells in the battery pack by managing the deformation mode of the rocker.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0029] Hereinafter, an example of an embodiment of the vehicle lower structure according to the present invention will be described with reference to FIGS. 1 to 4. Note that the arrow FR appropriately shown in each figure indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow RH indicates the right side in the vehicle width direction.

[0030] First, with reference to FIGS. 1 and 2, a schematic configuration of the "vehicle 10" to which the vehicle lower structure according to the present embodiment is applied will be described. In the present embodiment, since the vehicle 10 basically has a bilaterally symmetric configuration, hereinafter, the configuration of the right side portion in the vehicle width direction of the vehicle 10 will be mainly described, and the description of the configuration of the left side portion in the vehicle width direction will be appropriately omitted.

[0031] The vehicle 10 includes a vehicle body 12, a power unit such as a motor (not shown) mounted on the vehicle 10, and a "battery pack 14" attached to the vehicle body 12. The power unit is configured to be driven by receiving power supply from the battery pack 14, and the vehicle 10 travels by the driving force generated by this power unit.

[0032] The vehicle body 12 is provided with a "passenger compartment 16", and the lower part of the vehicle is constituted by a floor part 18. This floor part 18 is composed of a floor panel 20, "rockers 22", "support parts 24", a "floor cross member 26" as a support skeleton part, and side members 28.

[0033] Specifically, the floor panel 20 is formed by pressing a steel plate and extends in the vehicle front-rear direction and the vehicle width direction when viewed from the vehicle up-down direction. And on the outer side in the vehicle width direction of the floor panel 20, a pair of left and right rockers 22 are arranged along the vehicle front-rear direction at the peripheral edge part on the outer side in the vehicle width direction of the floor panel 20.

[0034] The rockers 22 are made of steel, extend in the vehicle front-rear direction, and are composed of a rocker outer panel 30 that constitutes the outer part in the vehicle width direction thereof and a rocker inner panel 32 that constitutes the inner part in the vehicle width direction thereof.

[0035] Specifically, the rocker outer panel 30 includes an upper wall part 30A that constitutes the upper part in the vehicle of it, a side wall part 30B that constitutes the outer part in the vehicle width direction of it, a lower wall part 30C that constitutes the lower part in the vehicle of it, and a pair of flange parts 30D. Also, the rocker outer panel 30 has a hat-shaped cross-sectional shape when viewed from the vehicle front-rear direction, with the inner side in the vehicle width direction being open.

[0036] On the other hand, the rocker inner panel 32 includes an upper wall part 32A that constitutes the upper part in the vehicle of it, a side wall part 32B that constitutes the inner part in the vehicle width direction of it, a lower wall part 32C that constitutes the lower part in the vehicle of it, and a pair of flange parts 32D. Also, the rocker inner panel 32 has a hat-shaped cross-sectional shape when viewed from the vehicle front-rear direction, with the outer side in the vehicle width direction being open. Note that an end part 20A on the outer side in the vehicle width direction of the floor panel 20 is joined to the side wall part 32B by a joining part (not shown) such as welding.

[0037] Then, the flange portion 30D of the rocker outer panel 30 and the flange portion 32D of the rocker inner panel 32 are joined at a joint (not shown) by welding or the like, so that the rocker 22 has a closed cross-section structure in which the cross-sectional shape viewed from the vehicle front-rear direction is substantially hexagonal.

[0038] Also, a "bulkhead 34" as a load transmission member is disposed inside the rocker 22. The bulkhead 34 includes a main board portion 34A, an outer flange portion 34B, an upper flange portion 34C, and a lower flange portion 34D that constitute its main parts.

[0039] Specifically, the main board portion 34A is in the shape of a rectangular plate when viewed from the vehicle front-rear direction and partitions the inside of the rocker 22 in the vehicle front-rear direction, and the end portion on the inner side in the vehicle width direction thereof is in contact with the side wall portion 32B of the rocker inner panel 32.

[0040] The outer flange portion 34B extends in the vehicle front-rear direction from the peripheral edge portion on the outer side in the vehicle width direction of the main board portion 34A, and is joined to the side wall portion 30B of the rocker outer panel 30 at a joint (not shown) by welding or the like.

[0041] Also, the upper flange portion 34C extends in the vehicle front-rear direction from the peripheral edge portion on the upper side of the vehicle of the main board portion 34A, and is joined to the upper wall portion 30A of the rocker outer panel 30 at a joint (not shown) by welding or the like.

[0042] Also, the lower flange portion 34D extends in the vehicle front-rear direction from the peripheral edge portion on the lower side of the vehicle of the main board portion 34A, and is joined to the lower wall portion 32C of the rocker outer panel 30 at a joint (not shown) by welding or the like.

[0043] Then, the bulkhead 34 configured as described above is arranged in a pair at a predetermined interval in the vehicle front-rear direction with respect to one rocker 22, and is capable of transmitting the load in the vehicle width direction input to the rocker 22 to the support portion 24.

[0044] In addition, a "weak portion 36" is provided at the center in the vehicle longitudinal direction between the portions where the bulkheads 34 are provided on the rocker 22. As shown in FIG. 4, this weak portion 36 is constituted by forming concave portions 38 extending in the vehicle longitudinal direction in each of the upper wall portion 30A, side wall portion 30B, and lower wall portion 30C of the rocker outer panel 30 and the upper wall portion 32A, side wall portion 32B, and lower wall portion 32C of the rocker inner panel 32.

[0045] And, the moment of inertia about the neutral axis of the cross-section of the weak portion 36 as viewed from the vehicle longitudinal direction is a value smaller than the moment of inertia about the neutral axis of the cross-section of the other portion of the rocker 22 as viewed from the vehicle longitudinal direction. That is, the rigidity (bending rigidity) against the load in the vehicle width direction of the weak portion 36 is lower than that of the other portion of the rocker 22.

[0046] On the other hand, as shown in FIG. 1, the support portion 24 is disposed on the upper side of the vehicle of the floor panel 20 and on the inner side in the vehicle width direction with respect to each of the portions where the bulkheads 34 of the rocker 22 are provided. That is, the support portions 24 are arranged in a pair with a predetermined interval in the vehicle longitudinal direction with respect to one rocker 22. And the paired support portions 24 are arranged at the same position in the vehicle width direction.

[0047] Specifically, as also shown in FIGS. 2 and 3, the support portion 24 includes a main body portion 24A, an outer flange portion 24B, and a lower flange portion 24C that constitute its main part.

[0048] The main body portion 24A includes an upper wall portion 24A1 that constitutes the upper side portion of the vehicle, a front wall portion 24A2 that constitutes the front side portion of the vehicle, a rear wall portion 24A3 that constitutes the rear side portion of the vehicle, and an inner wall portion 24A4 that constitutes the inner side portion in the vehicle width direction, and is configured in a rectangular parallelepiped shape with the vehicle longitudinal direction as the longitudinal direction.

[0049] Further, the outer flange portion 24B extends in the vehicle width direction from the respective peripheral portions on the outer side in the vehicle width direction of the upper wall portion 24A1, the front wall portion 24A2, and the rear wall portion 24A3 in the plate thickness direction. The outer flange portion 24B is joined to the side wall portion 32B of the rocker inner panel 32 by a joining portion (not shown) such as welding.

[0050] Also, the lower flange portion 24C extends in the vehicle vertical direction from the respective peripheral portions on the lower side of the vehicle of the front wall portion 24A2, the rear wall portion 24A3, and the inner wall portion 24A4 in the plate thickness direction. The lower flange portion 24C is joined to the floor panel 20 by a joining portion (not shown) such as welding.

[0051] On the other hand, the floor cross member 26 is made of steel and extends in the vehicle width direction inside the vehicle width direction of the support portion 24, and includes a main body portion 26A that constitutes a main part thereof and an outer flange portion 26B.

[0052] The cross-sectional shape of the main body portion 26A as viewed from the vehicle front-rear direction is a hat shape with the lower side of the vehicle open, and its flange portion 26A1 is joined to the floor panel 20 by a joining portion (not shown) such as welding. Further, the main body portion 26A, when joined to the floor panel 20, constitutes a closed cross-sectional structure portion together with the floor panel 20.

[0053] On the other hand, the outer flange portion 26B extends in the vehicle width direction from the peripheral portion on the outer side in the vehicle width direction of the main body portion 26A in the plate thickness direction. The outer flange portion 26B is joined to the inner wall portion 24A4 of the support portion 24 by a joining portion (not shown) such as welding. Note that the floor cross member 26 is arranged such that its main part overlaps with the support portion 24 when viewed from the vehicle width direction.

[0054] As shown in FIG. 2, the side member 28 is made of steel and extends in the vehicle longitudinal direction, and is disposed on both sides in the vehicle width direction of the floor panel 20 below the vehicle. Note that the side member 28 is located inside the vehicle width direction with respect to the rocker 22.

[0055] This side member 28 has a hat-shaped cross-sectional shape when viewed from the vehicle longitudinal direction, with its upper side of the vehicle open, and its flange portion 28A is joined to the floor panel 20 by a joining portion (not shown) such as welding. Further, the side member 28, when joined to the floor panel 20, together with the floor panel 20, constitutes a closed cross-section structure portion. And in the present embodiment, the battery pack 14 is attached to the side member 28.

[0056] As shown in FIGS. 1 and 2, the battery pack 14 is located below the vehicle with respect to the passenger compartment 16, and includes a battery case 40 mainly made of an aluminum alloy and "battery cells 41" disposed inside the battery case 40.

[0057] The battery case 40 includes a main body portion 40A in which the battery cells 41 are accommodated and a base portion 40B that constitutes the lower portion of the vehicle. Then, the battery case 40 is fixed to the vehicle body 12 by attaching the base portion 40B to the side member 28 with a mounting member (not shown) in a state where the main part of the main body portion 40A is accommodated between the side members 28 and a state where the mounting member 33 is interposed between the base portion 40B and the side member 28. Note that the battery pack 14 is in a state where a part thereof overlaps with the rocker 22 when viewed from the vehicle width direction.

[0058] In addition, the battery case 40 is reinforced by a "battery cross member 42" serving as a central skeleton portion provided inside thereof. This battery cross member 42 is formed of an aluminum alloy extrusion material and has a square tube shape extending in the vehicle width direction, and is spanned between the upper portions of the side wall portions 40A1 on the outer side in the vehicle width direction of the main body portion 40A. Note that the rigidity of the floor cross member 26 described above with respect to the load in the vehicle width direction is higher than the rigidity of the battery cross member 42 with respect to the load.

[0059] In addition, the battery cross member 42 is located between the support portions 24 in the vehicle longitudinal direction and overlaps with the vulnerable portion 36 of the rocker 22 when viewed from the vehicle width direction. This can also be regarded as the arrangement positions of the battery cross member 42 and the vulnerable portion 36 being set at the same position in the vehicle longitudinal direction. Further, the "end portion 42A" of the battery cross member 42 is located on the inner side in the vehicle width direction than the support portion 24.

[0060] Note that, when viewed from the vehicle vertical direction, the main portion of the support portion 24 is arranged between the battery cross member 42 and the rocker 22 in the vehicle width direction.

[0061] (Operations and Effects of the Present Embodiment) Next, the operations and effects of the present embodiment will be described.

[0062] In the present embodiment, as shown in FIG. 2, the battery pack 14 is arranged below the vehicle with respect to the passenger compartment 16, and this battery pack 14 includes battery cells 41 inside thereof. Further, a rocker 22 extending in the vehicle longitudinal direction is arranged outside the battery pack 14 in the vehicle width direction. For this reason, when a collision load in the vehicle width direction is input, the collision load is input to the rocker 22 prior to the battery pack 14.

[0063] By the way, when a collision load in the vehicle width direction is input, depending on the deformation mode of the rocker 22, it is conceivable that this collision load is input to the battery cells 41 in the battery pack 14.

[0064] Here, in the present embodiment, a pair of support portions 24 are provided for one rocker 22, and at least a part of these support portions 24 is arranged between the battery pack 14 and the rocker 22 in the vehicle width direction when viewed from the vehicle vertical direction, and they are arranged at intervals in the vehicle longitudinal direction with respect to each other.

[0065] Also, as shown in FIG. 1, a battery cross member 42 extending in the vehicle width direction is located between the pair of support portions 24 in the vehicle longitudinal direction, and an end portion 42A of this battery cross member 42 is located inside the vehicle width direction from the pair of support portions 24.

[0066] Therefore, when a collision load in the vehicle width direction is input to the rocker 22, the rocker 22 is supported by the pair of support portions 24, and when viewed from the vehicle vertical direction, it bends and deforms such that the vicinity of the central portion of the portion between the pair of support portions 24 in the vehicle longitudinal direction becomes the apex. And in the present embodiment, the vicinity of the apex of the rocker 22 deformed by receiving the collision load can be supported by the battery cross member 42, and as a result, transmission of the collision load to the battery cell 41 side can be suppressed.

[0067] Also, in the present embodiment, a floor cross member 26 is provided, and this floor cross member 26 extends in the vehicle width direction inside the vehicle width direction of the support portion 24 and is arranged so as to overlap the support portion 24 when viewed from the vehicle width direction.

[0068] Therefore, in the present embodiment, at the time of input of a collision load in the vehicle width direction, a part of the load input to the support portion 24 can be supported by the floor cross member 26.

[0069] Also, in the present embodiment, the vicinity of the apex of the rocker 22 deformed by receiving a collision load in the vehicle width direction can be supported by the battery cross member 42 provided in the battery pack 14. That is, in the present embodiment, the collision load can also be supported by components inside the battery pack 14.

[0070] Incidentally, depending on the rigidity of the floor cross member 26 with respect to the collision load in the vehicle width direction, when the collision load is input to the rocker 22, it is conceivable that the state where the rocker 22 is supported by the floor cross member 26 cannot be maintained and the entire rocker 22 is pushed inward in the vehicle width direction.

[0071] Here, in the present embodiment, the rigidity of the floor cross member 26 with respect to the load in the vehicle width direction is higher than the rigidity of the battery cross member 42 with respect to the load. Therefore, when a load in the vehicle width direction is input, the probability that the load is supported by the floor cross member 26 is increased, and thus, the probability that the vicinity of the apex of the rocker 22 that has been bent and deformed under the vehicle collision load is supported by the battery cross member 42 can be increased.

[0072] Further, in the present embodiment, a vulnerable portion 36 is provided in a portion of the rocker 22 that is located between the support portions 24 in the vehicle longitudinal direction, and the rigidity of the vulnerable portion 36 with respect to the load in the vehicle width direction is lower than the rigidity of the other portions of the rocker 22. Therefore, in the present embodiment, when a collision load in the vehicle width direction is input to the rocker 22, the probability that the rocker 22 deforms starting from the vulnerable portion 36 can be increased, and the deformation mode of the rocker 22 can be made easier to manage.

[0073] Further, in the present embodiment, in the vehicle longitudinal direction, the arrangement position of the battery cross member 42 and the arrangement position of the vulnerable portion 36 of the rocker 22 are set at the same position, and the probability that the vicinity of the apex of the rocker 22 that has been deformed by receiving a collision load in the vehicle width direction is supported by the battery cross member 42 can be increased.

[0074] In addition, in the present embodiment, as shown in FIG. 2, a bulkhead 34 is disposed within the rocker 22, and this bulkhead 34 is capable of transmitting a load in the vehicle width direction to the support portion 24. Therefore, in the present embodiment, when a collision load in the vehicle width direction is input, even if the rocker 22 is deformed by the collision load, a part of the collision load can be transmitted to the support portion 24 via the bulkhead 34.

[0075] Thus, in the present embodiment, by managing the deformation mode of the rocker 22, it is possible to suppress the input of a collision load in the vehicle width direction to the battery cell 41 within the battery pack 14.

[0076] <Supplementary Explanation of the Above Embodiment> (1) In the above-described embodiment, the vicinity of the apex of the rocker 22 deformed by receiving a collision load in the vehicle width direction was configured to be supported by the battery cross member 42 provided within the battery pack 14, but the configuration of the vehicle 10 is not limited thereto. For example, depending on the specifications of the vehicle 10 or the like, instead of the battery cross member 42, a configuration may be adopted in which a floor cross member spanning between the side members 28 is disposed on the lower side of the vehicle of the floor panel 20.

[0077] (2) Also, in the above-described embodiment, the support portion 24 was provided on the upper side of the vehicle of the floor panel 20, but depending on the specifications of the vehicle 10 or the like, a configuration may be adopted in which the support portion 24 is interposed between the rocker 22 and the side member 28 on the lower side of the vehicle of the floor panel 20. In addition, when adopting such a configuration, a configuration may be adopted in which the floor cross member 26 is spanned between the rockers 22.

Explanation of Reference Numerals

[0078] 10 Vehicle 14 Battery Pack 16 Passenger Compartment 22 Rocker 24 Support Portion 26 Floor Cross Member (Support Skeleton Portion) 34 Bulkhead (Load Transmission Member) 36 Vulnerable part 41 Battery cell 42 Battery cross member (central framework part) 42A End part

Claims

1. A battery pack having a battery cell inside and disposed below the vehicle compartment with respect to the vehicle compartment, and A rocker disposed outside the battery pack in the vehicle width direction and extending in the vehicle longitudinal direction, and A support portion that is disposed at least partially between the battery pack and the rocker in the vehicle width direction when viewed from the vehicle vertical direction and is arranged in a pair with a space in the vehicle longitudinal direction, and A central skeleton portion that extends in the vehicle width direction, is located between the support portions in the vehicle longitudinal direction, and has ends located inside the vehicle width direction of the support portions, and A vehicle lower structure having the above.

2. The vehicle lower structure according to claim 1, further comprising a support skeleton portion that extends in the vehicle width direction inside the support portion in the vehicle width direction and is arranged so as to overlap the support portion when viewed from the vehicle width direction. The vehicle lower structure according to claim 1.

3. The central skeleton portion is a battery cross member provided in the battery pack. The vehicle lower structure according to claim 2.

4. The rigidity of the support skeleton portion with respect to the load in the vehicle width direction is higher than the rigidity of the battery cross member with respect to the load. The vehicle lower structure according to claim 3.

5. The rocker is provided with a vulnerable portion having a lower rigidity with respect to the load in the vehicle width direction at a portion located between the support portions in the vehicle longitudinal direction than the rigidity of the other portions of the rocker. The vehicle lower structure according to claim 1.

6. In the vehicle longitudinal direction, the arrangement position of the central skeleton portion and the arrangement position of the vulnerable portion are set at the same position. The vehicle lower structure according to claim 5.

7. The vehicle lower structure according to claim 1, further comprising a load transmission member that is disposed inside the rocker and is capable of transmitting the load in the vehicle width direction to the support portion. The vehicle lower structure according to claim 1.

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