Vehicle under structure

Abstract

The invention provides a vehicle underbody structure. The vehicle lower mechanism includes: a battery pack including a battery unit therein and disposed on a vehicle lower side with respect to a cabin of the vehicle; a rocker disposed on an outer side of the battery pack in a vehicle width direction and extending in a vehicle front-rear direction; a pair of support portions disposed at least partially between the battery pack and the rocker in the vehicle width direction when viewed in a vehicle up-down direction, and spaced apart from each other in the vehicle front-rear direction; and a center frame extending in the vehicle width direction, located between the support portions in the vehicle front-rear direction, and including end portions located on an inner side in the vehicle width direction with respect to the support portions.

Description

Technical Field

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

[0002] Japanese Unexamined Patent Application Publication No. 2023-80379 (JP 2023-80379A) discloses an invention related to a vehicle bottom structure. In this vehicle bottom structure, when viewed in the vehicle width direction, a battery pack and a rocker overlap each other, and the rocker includes a shock absorption portion having hollows extending in the vehicle front-rear direction. When a collision load is input in the vehicle width direction, the periphery of the hollows of the shock absorption portion collapses, thereby absorbing the collision load and suppressing the input of the collision load to the battery pack. Summary of the Invention

[0003] When a collision load is input in the vehicle width direction, depending on the deformation mode of the rocker, the collision load may be input to the battery cells in the battery pack.

[0004] The present invention provides a vehicle lower structure that can suppress the input of a collision load in the vehicle width direction to the battery cells in the battery pack by managing the deformation mode of the rocker.

[0005] A vehicle lower structure according to one aspect includes: a battery pack that includes battery cells therein and is disposed below the vehicle cabin of the vehicle; a rocker that is disposed outside the battery pack in the vehicle width direction and extends in the vehicle front-rear direction; a pair of support portions that, when viewed in the vehicle vertical direction, are at least partially disposed between the battery pack and the rocker in the vehicle width direction and are spaced apart from each other in the vehicle front-rear direction; and a center frame that extends in the vehicle width direction, is located between the support portions in the vehicle front-rear direction, and includes an end portion that is located inside the support portions in the vehicle width direction.

[0006] In the vehicle lower structure according to the above aspect, the battery pack is disposed below the vehicle cabin and includes battery cells therein. The rocker that extends in the vehicle front-rear direction is disposed outside the battery pack in the vehicle width direction. Therefore, when a collision load is input in the vehicle width direction, the collision load is input to the rocker before being input to the battery pack.

[0007] When a collision load is input in the vehicle width direction, depending on the deformation mode of the rocker, the collision load may be input to the battery cells in the battery pack.

[0008] In this solution, a pair of support portions are provided. When observed in the vehicle up-and-down direction, at least a part of the support portions is arranged between the battery pack and the lower side member in the vehicle width direction, and the support portions are arranged spaced apart from each other in the vehicle front-rear direction.

[0009] A central frame extending in the vehicle width direction is located between the support portions in the vehicle front-rear direction, and the ends of the central frame are located on the inner side in the vehicle width direction with respect to the support portions.

[0010] Therefore, when a collision load is input to the lower side member in the vehicle width direction, the lower side member supported by the support portions bends, so that when observed in the vehicle up-and-down direction, the apex of the lower side member is near the center of the portion between the support portions of the lower side member in the vehicle front-rear direction. In this solution, the vicinity of the apex of the lower side member deformed due to the collision load can be supported by the central frame, thereby suppressing the transmission of the collision load toward the battery unit.

[0011] The vehicle lower structure according to the above solution may further include a support frame that extends in the vehicle width direction on the inner side in the vehicle width direction of the support portion and is arranged to overlap the support portion when observed in the vehicle width direction.

[0012] In the vehicle lower structure according to the above solution, a support frame is provided. The support frame extends in the vehicle width direction on the inner side in the vehicle width direction of the support portion and is arranged to overlap the support portion when observed in the vehicle width direction.

[0013] Therefore, in this solution, when a collision load is input in the vehicle width direction, a part of the load input to the support portion can be borne by the support frame.

[0014] In the vehicle lower structure according to the above solution, the central frame may be a battery lateral member provided inside the battery pack.

[0015] In the vehicle lower structure according to the above solution, the vicinity of the apex of the lower side member deformed due to the collision load in the vehicle width direction can be supported by the battery lateral member provided inside the battery pack. That is, in this solution, the collision load can also be borne by the components inside the battery pack.

[0016] In the vehicle lower structure according to the above solution, the stiffness of the support frame against the load in the vehicle width direction may be higher than the stiffness of the battery lateral member against the load.

[0017] In the vehicle lower structure according to the above solution, as described above, when a collision load is input to the lower side member in the vehicle width direction, a part of the load input from the lower side member to the support portion is borne by the support frame.

[0018] Depending on the stiffness of the support frame against the collision load in the vehicle width direction, there is a possibility that when the collision load is input to the lower side member, the lower side member cannot maintain the support by the support frame, and the entire lower side member is pushed inward in the vehicle width direction.

[0019] In this solution, the stiffness of the support frame against the load in the vehicle width direction is higher than the stiffness of the battery lateral member against the load. This can improve the certainty that the load is borne by the support frame when the load is input in the vehicle width direction, and in addition, improve the certainty of the battery lateral member supporting the vicinity of the vertex of the lower side member that is bent due to the vehicle collision load.

[0020] In the vehicle lower structure according to the above solution, the lower side member may include a weakened portion, the weakened portion is provided in a portion between the support portions in the vehicle longitudinal direction, and has a lower stiffness against the load in the vehicle width direction than other portions of the lower side member.

[0021] In the vehicle lower structure according to the above solution, the weakened portion is provided in a portion of the lower side member between the support portions in the vehicle longitudinal direction. The stiffness of the weakened portion against the load in the vehicle width direction is lower than the stiffness of other portions of the lower side member. Therefore, this solution can improve the certainty that the lower side member deforms at the point starting from the weakened portion when the collision load is input to the lower side member in the vehicle width direction. Therefore, it is possible to more easily manage the deformation mode of the lower side member.

[0022] In the vehicle lower structure according to the above solution, in the vehicle longitudinal direction, the arrangement position of the central frame and the arrangement position of the weakened portion may be set to the same position.

[0023] In the vehicle lower structure according to the above solution, in the vehicle longitudinal direction, the arrangement position of the central frame and the arrangement position of the weakened portion are set to the same position, thereby improving the certainty of the central frame supporting the vicinity of the vertex of the lower side member that is deformed due to the collision load in the vehicle width direction.

[0024] The vehicle lower structure according to the above solution may further include a load transfer member, the load transfer member is arranged inside the lower side member, and is configured to transfer the load in the vehicle width direction to the support portion.

[0025] In the vehicle lower structure according to the above solution, the load transfer member is arranged inside the lower side member. The load transfer member is configured to transfer the load in the vehicle width direction to the support portion. Therefore, in this solution, when the collision load is input in the vehicle width direction, even if the lower side member deforms due to the collision load, a part of the collision load can be transferred to the support portion via the load transfer member.

[0026] As described above, the vehicle lower structure according to the present invention has the following excellent effects: by managing the deformation mode of the lower side member, it is possible to suppress the input of a collision load in the vehicle width direction to the battery cells in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings, in which like reference numerals denote like elements, and in which:

[0028] Figure 1 is a plan view schematically showing the structure of a vehicle to which the vehicle lower structure according to the embodiment is applied;

[0029] Figure 2 is a cross-sectional view from the rear side of the vehicle schematically showing the structure of the lower part of the vehicle body of a vehicle to which the vehicle lower structure according to the embodiment is applied (a cross-sectional view taken along line 2-2 in Figure 1 );

[0030] Figure 3 is a cross-sectional view from the inner side in the vehicle width direction of the lower part of the vehicle body of a vehicle to which the vehicle lower structure according to the embodiment is applied (a cross-sectional view taken along line 3-3 in Figure 1 ); and

[0031] Figure 4 is a cross-sectional view from the rear side of the vehicle schematically showing the structure of the lower side member of a vehicle to which the vehicle lower structure according to the embodiment is applied (a cross-sectional view taken along line 4-4 in Figure 1 ). DETAILED DESCRIPTION

[0032] Hereinafter, exemplary embodiments of the vehicle lower structure according to the present invention will be described with reference to Figures 1 to 4 The arrow "front" indicates the front side of the vehicle, the arrow "up" indicates the upper side of the vehicle, and the arrow "right" indicates the right side in the vehicle width direction. These arrows appear in the drawings as appropriate.

[0033] First, the schematic structure of "Vehicle 10" to which the vehicle lower structure according to the present embodiment is applied will be described with reference to Figure 1 and Figure 2 Since Vehicle 10 basically has a bilaterally symmetric structure, the following description of the present embodiment will focus on the structure on the right side in the vehicle width direction of Vehicle 10, and the description of the structure on the left side in the vehicle width direction will be omitted as appropriate.

[0034] 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 driven by electric power supplied from the battery pack 14, and the vehicle 10 travels by the driving force generated by the power unit.

[0035] The vehicle body 12 has a "compartment 16", and the portion of the compartment 16 on the lower side of the vehicle is a floor portion 18. The floor portion 18 includes a floor panel 20, a "lower side member 22", a "support portion 24", a "floor crossmember 26" serving as a support frame, and a side member 28. The "floor crossmember 26" is an example of the "support frame" in the present disclosure.

[0036] Specifically, the floor panel 20 is formed by stamping a steel plate and extends in the vehicle front-rear direction and the vehicle width direction when viewed in the vehicle up-down direction. On the outer sides in the vehicle width direction of the floor panel 20, a pair of left and right lower side members 22 are arranged along the vehicle front-rear direction at the outer peripheral edges in the vehicle width direction of the floor panel 20.

[0037] The lower side member 22 is made of steel and extends in the vehicle front-rear direction, and includes a lower side member outer panel 30 constituting the outside in the vehicle width direction of the lower side member 22 and a lower side member inner panel 32 constituting the inside in the vehicle width direction of the lower side member 22.

[0038] Specifically, the lower side member outer panel 30 includes an upper wall portion 30A constituting the portion on the upper side of the vehicle, a side wall portion 30B constituting the outside in the vehicle width direction, a lower wall portion 30C constituting the portion on the lower side of the vehicle, and a pair of flange portions 30D. The cross-sectional shape of the lower side member outer panel 30 when viewed in the vehicle front-rear direction is a hat shape that is open on the inner side in the vehicle width direction.

[0039] The lower side member inner panel 32 includes an upper wall portion 32A constituting the portion on the upper side of the vehicle, a side wall portion 32B constituting the inside in the vehicle width direction, a lower wall portion 32C constituting the portion on the lower side of the vehicle, and a pair of flange portions 32D. The cross-sectional shape of the lower side member inner panel 32 when viewed in the vehicle front-rear direction is a hat shape that is open on the outer side in the vehicle width direction. The outer end 20A of the floor panel 20 in the vehicle width direction is joined to the side wall portion 32B at a joint portion (not shown) by welding or the like.

[0040] The flange portion 30D of the lower side member outer panel 30 and the flange portion 32D of the lower side member inner panel 32 are joined at a joint portion (not shown) by welding or the like. Therefore, the lower side member 22 has a closed cross-section structure, and the cross-sectional shape when viewed in the vehicle front-rear direction is a closed cross-sectional shape that is substantially hexagonal.

[0041] The "partition plate 34" serving as a load transfer member is arranged inside the lower side beam 22. The partition plate 34 is an example of the "load transfer member" in the present disclosure. The partition plate 34 includes a main plate portion 34A that constitutes the main part of the partition plate 34, an outer flange portion 34B, an upper flange portion 34C, and a lower flange portion 34D.

[0042] Specifically, when viewed in the vehicle longitudinal direction, the main plate portion 34A has a rectangular plate shape, divides the interior of the lower side beam 22 in the vehicle longitudinal direction, and the inner end in the vehicle width direction contacts the side wall portion 32B of the inner panel 32 of the lower side beam.

[0043] The outer flange portion 34B extends in the vehicle longitudinal direction from the outer peripheral edge of the main plate portion 34A in the vehicle width direction, and is joined to the side wall portion 30B of the outer panel 30 of the lower side beam at a joint portion (not shown) by welding or the like.

[0044] The upper flange portion 34C extends in the vehicle longitudinal direction from the peripheral edge of the main plate portion 34A on the upper side of the vehicle, and is joined to the upper wall portion 30A of the outer panel 30 of the lower side beam at a joint portion (not shown) by welding or the like.

[0045] The lower flange portion 34D extends in the vehicle longitudinal direction from the peripheral edge of the main plate portion 34A on the lower side of the vehicle, and is joined to the lower wall portion 30C of the outer panel 30 of the lower side beam at a joint portion (not shown) by welding or the like.

[0046] A pair of partition plates 34 configured as described above are arranged in each lower side beam 22 at a predetermined distance in the vehicle longitudinal direction, and can transfer the load input in the vehicle width direction to the support portion 24.

[0047] The central portion of the lower side beam 22 in the vehicle longitudinal direction between the portions where the partition plates 34 are provided includes a "weakening portion 36". Similarly, as Figure 4 shown, the weakening portion 36 is formed by forming depressions 38 that extend in the vehicle longitudinal direction in the upper wall portion 30A, side wall portion 30B, and lower wall portion 30C of the outer panel 30 of the lower side beam and the upper wall portion 32A, side wall portion 32B, and lower wall portion 32C of the inner panel 32 of the lower side beam.

[0048] The second moment of area of the cross-sectional area around the neutral axis of the weakening portion 36 when viewed in the vehicle longitudinal direction is smaller than the second moment of area of the cross-sectional area around the neutral axis of the other portions of the lower side beam 22 when viewed in the vehicle longitudinal direction. That is, the stiffness (bending stiffness) of the weakening portion 36 against the load in the vehicle width direction is lower than the stiffness of the other portions of the lower side beam 22.

[0049] As Figure 1As shown, on the vehicle upper side of the floor panel 20, the portions of the support portion 24 where the partition 34 is provided with respect to the lower side beam 22 are arranged on the inner side in the vehicle width direction. That is, a pair of support portions 24 are arranged at a predetermined distance in the vehicle front-rear direction for each lower side beam 22. The support portions 24 are arranged at the same position in the vehicle width direction.

[0050] Specifically, as Figure 2 and Figure 3 shown, the support portion 24 includes a main body 24A that constitutes the main part of the support portion 24, an outer flange portion 24B, and a lower flange portion 24C.

[0051] The main body 24A includes an upper wall portion 24A1 that constitutes a part of the vehicle upper side, a front wall portion 24A2 that constitutes a part of the vehicle front side, a rear wall portion 24A3 that constitutes a part of the vehicle rear side, and an inner wall portion 24A4 that constitutes an inner part in the vehicle width direction. The outer shape of the main body 24A is a rectangular parallelepiped shape, and its length direction corresponds to the vehicle front-rear direction.

[0052] The outer flange portion 24B extends from each of the outer peripheral edges in the vehicle width direction of the upper wall portion 24A1, the outer peripheral edges in the vehicle width direction of the front wall portion 24A2, and the outer peripheral edges in the vehicle width direction of the rear wall portion 24A3 in a state where its thickness direction corresponds to the vehicle width direction. The outer flange portion 24B is joined to the side wall portion 32B of the lower side beam inner panel 32 at a joint portion (not shown) by welding or the like.

[0053] The lower flange portion 24C extends from each of the peripheral edges on the vehicle lower side of the front wall portion 24A2, the peripheral edges on the vehicle lower side of the rear wall portion 24A3, and the peripheral edges on the vehicle lower side of the inner wall portion 24A4 in a state where its thickness direction corresponds to the vehicle up-down direction. The lower flange portion 24C is joined to the floor panel 20 at a joint portion (not shown) by welding or the like.

[0054] The floor cross member 26 is made of steel, extends in the vehicle width direction on the inner side in the vehicle width direction of the support portion 24, and includes a main body 26A that constitutes the main part of the floor cross member 26 and an outer flange portion 26B.

[0055] The cross-sectional shape of the main body 26A observed in the vehicle width direction is a hat shape that is open on the vehicle lower side, and the flange portion 26A1 is joined to the floor panel 20 at a joint portion (not shown) by welding or the like. The main body 26A joined to the floor panel 20 and the floor panel 20 together form a closed cross-sectional structure.

[0056] The outer flange portion 26B extends from the outer peripheral edge in the vehicle width direction of the main body 26A in a state where it corresponds to the vehicle width direction in its thickness direction. The outer flange portion 26B is joined to the inner wall portion 24A4 of the support portion 24 at a joint portion (not shown) by welding or the like. The floor cross member 26 is arranged such that when viewed in the vehicle width direction, its main portion overlaps with the support portion 24.

[0057] As Figure 2 shown, the side member 28 is made of steel, extends in the vehicle longitudinal direction, and is disposed on the vehicle lower side of the floor panel 20 on each side in the vehicle width direction of the floor panel 20. The side member 28 is located inside the side sill 22 in the vehicle width direction.

[0058] The cross-sectional shape of the side member 28 when viewed in the vehicle longitudinal direction is hat-shaped and open at the vehicle upper side, and the flange portion 28A is joined to the floor panel 20 at a joint portion (not shown) by welding or the like. The side member 28 joined to the floor panel 20 and the floor panel 20 together form a closed cross-section structure. In the present embodiment, the battery pack 14 is attached to the side member 28.

[0059] As Figure 1 and Figure 2 shown, the battery pack 14 is located on the vehicle lower side with respect to the passenger compartment 16, and includes a battery case 40 mainly made of aluminum alloy, and "battery cells 41" disposed inside the battery case 40.

[0060] The battery case 40 includes a main body 40A that houses the battery cells 41, and a base portion 40B that forms a portion on the vehicle lower side. In a state where the main portion of the main body 40A is assembled between the side members 28, and in a state where the mounting member 33 is interposed between the base portion 40B and each side member 28, the base portion 40B is attached to the side member 28 by using an attachment member (not shown) to fix the battery case 40 to the vehicle body 12. When viewed in the vehicle width direction, a part of the battery pack 14 overlaps with the side sill 22.

[0061] The battery case 40 is reinforced by a "battery cross member 42" provided as a central frame on the inside. The "battery cross member 42" is an example of the "central frame" in the present disclosure. The battery cross member 42 is an aluminum alloy extrusion having a rectangular tube shape extending in the vehicle width direction, and spans between portions on the vehicle upper side of the side wall portions 40A1 on the outer side in the vehicle width direction of the main body 40A. The stiffness of the floor cross member 26 against the load in the vehicle width direction is higher than the stiffness of the battery cross member 42 against the load.

[0062] The battery lateral member 42 is located between the support portions 24 in the vehicle front-rear direction and overlaps with the weakened portion 36 of the lower side member 22 when viewed in the vehicle width direction. It can also be said that the arrangement position of the battery lateral member 42 and the arrangement position of the weakened portion 36 are set to the same position in the vehicle front-rear direction. The "end portion 42A" of the battery lateral member 42 is located inside the support portion 24 in the vehicle width direction.

[0063] When viewed in the vehicle up-down direction, the main portion of the support portion 24 is arranged between the battery lateral member 42 and the lower side member 22 in the vehicle width direction.

[0064] Functions and effects of the embodiment

[0065] Next, the functions and effects of this embodiment will be described.

[0066] In this embodiment, as Figure 2 shown, the battery pack 14 is arranged below the vehicle compartment 16 and includes battery cells 41 inside. The lower side member 22 extending in the vehicle front-rear direction is arranged outside the battery pack 14 in the vehicle width direction. Therefore, when a collision load is input in the vehicle width direction, the collision load is input to the lower side member 22 before being input to the battery pack 14.

[0067] When a collision load is input in the vehicle width direction, depending on the deformation mode of the lower side member 22, this collision load may be input to the battery cells 41 in the battery pack 14.

[0068] In this embodiment, a pair of support portions 24 are provided for one lower side member 22. When viewed in the vehicle up-down direction, at least a part of the support portion 24 is arranged between the battery pack 14 and the lower side member 22 in the vehicle width direction, and the support portions 24 are arranged at intervals in the vehicle front-rear direction.

[0069] As Figure 1 shown, the battery lateral member 42 extending in the vehicle width direction is arranged between the support portions 24 in the vehicle front-rear direction, and the end portion 42A of the battery lateral member 42 is located inside the support portion 24 in the vehicle width direction.

[0070] Therefore, when a collision load is input to the lower side member 22 in the vehicle width direction, the lower side member 22 supported by the support portion 24 bends, so that when viewed in the vehicle up-down direction, the apex of the lower side member 22 is near the center of the portion between the support portions 24 of the lower side member 22 in the vehicle front-rear direction. In this embodiment, the vicinity of the apex of the lower side member 22 deformed due to the collision load can be supported by the battery lateral member 42, thereby suppressing the transmission of the collision load toward the battery cells 41.

[0071] In the present embodiment, a floor transverse member 26 is provided. The floor transverse member 26 extends in the vehicle width direction inside the support portion 24 in the vehicle width direction and is arranged to overlap the support portion 24 when viewed in the vehicle width direction.

[0072] Therefore, in the present embodiment, when a collision load is input in the vehicle width direction, a part of the load input to the support portion 24 can be borne by the floor transverse member 26.

[0073] In the present embodiment, the vertex vicinity of the lower side member 22 deformed due to a collision load in the vehicle width direction can be supported by a battery transverse member 42 provided inside the battery pack 14. That is, in the present embodiment, the collision load can also be borne by the components inside the battery pack 14.

[0074] Depending on the stiffness of the floor transverse member 26 against a collision load in the vehicle width direction, there is a possibility that when a collision load is input to the lower side member 22, the lower side member 22 cannot maintain the support by the floor transverse member 26 and the entire lower side member 22 is pushed inward in the vehicle width direction.

[0075] In the present embodiment, the stiffness of the floor transverse member 26 against a load in the vehicle width direction is higher than the stiffness of the battery transverse member 42 against the load. This can improve the certainty that the load is borne by the floor transverse member 26 when the load is input in the vehicle width direction, and in addition, improve the certainty that the vertex vicinity of the lower side member 22 bent due to a vehicle collision load is supported by the battery transverse member 42.

[0076] In the present embodiment, a weakened portion 36 is provided in a portion of the lower side member 22 between the support portions 24 in the vehicle front-rear direction. The stiffness of the weakened portion 36 against a load in the vehicle width direction is lower than the stiffness of the other portions of the lower side member 22. Therefore, the present embodiment can improve the certainty that when a collision load is input to the lower side member 22 in the vehicle width direction, the lower side member 22 deforms at a point starting from the weakened portion 36. Therefore, the deformation mode of the lower side member 22 can be more easily managed.

[0077] In the present embodiment, in the vehicle front-rear direction, the arrangement position of the battery transverse member 42 and the arrangement position of the weakened portion 36 of the lower side member 22 are set to the same position, thereby improving the certainty that the vertex vicinity of the lower side member 22 deformed due to a collision load in the vehicle width direction is supported by the battery transverse member 42.

[0078] In the present embodiment, as Figure 2As shown, the partition 34 is disposed inside the lower side beam 22. The partition 34 can transfer the load in the vehicle width direction to the support portion 24. Thus, in the present embodiment, when a collision load is input in the vehicle width direction, even if the lower side beam 22 is deformed due to the collision load, a part of the collision load can be transferred to the support portion 24 via the partition 34.

[0079] As described above, in the present embodiment, it is possible to suppress the collision load in the vehicle width direction from being input to the battery cells 41 in the battery pack 14 by managing the deformation mode of the lower side beam 22.

[0080] Supplementary description of the embodiment

[0081] (1) In the above embodiment, the vicinity of the vertex of the lower side beam 22 deformed due to the collision load in the vehicle width direction is supported by the battery lateral member 42 provided inside the battery pack 14, but the structure of the vehicle 10 is not limited thereto. For example, according to the specifications of the vehicle 10, the floor lateral member may be disposed between the side members 28 on the lower side of the vehicle of the floor panel 20 instead of the battery lateral member 42.

[0082] (2) In the above embodiment, the support portion 24 is provided on the upper side of the vehicle of the floor panel 20. According to the specifications of the vehicle 10, the support portion 24 may be between the lower side beam 22 and the side member 28 on the lower side of the vehicle of the floor panel 20. When such a structure is adopted, the floor lateral member 26 may span between the lower side beams 22.

Claims

1. A vehicle lower structure, characterized in that include: a battery pack including a battery cell therein and arranged on a lower side of the vehicle relative to a cabin of the vehicle; a rocker disposed on the outer side of the battery pack in the vehicle width direction and extending in the vehicle front-rear direction; a pair of support portions, the pair of support portions being arranged at least partially between the battery pack and the rocker in the vehicle width direction when viewed in the vehicle up-down direction and being spaced apart from each other in the vehicle front-rear direction; as well as A center frame extends in the vehicle width direction, is located between the support portions in the vehicle front-rear direction, and includes an end portion located on an inner side in the vehicle width direction relative to the support portions.

2. The vehicle lower structure according to claim 1, characterized in that: Also included is a support frame extending inwardly of the support portion in the vehicle width direction in the vehicle width direction and arranged so as to overlap the support portion when viewed in the vehicle width direction.

3. The vehicle lower structure according to claim 2, characterized in that: The central frame is a battery cross member disposed inside the battery pack.

4. The vehicle lower structure according to claim 3, characterized in that: The rigidity of the support frame 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.

5. The vehicle lower structure according to claim 1, characterized in that: The rocker includes a weakened portion that is provided at a portion between the support portions in the vehicle front-rear direction and has lower rigidity with respect to a load in the vehicle width direction than other portions of the rocker.

6. The vehicle lower structure according to claim 5, characterized in that: In the vehicle front-rear direction, an arrangement position of the center frame and an arrangement position of the weakened portion are set to the same position.

7. The vehicle lower structure according to claim 1, characterized in that: A load transfer member is also included. The load transfer member is arranged inside the rocker and is configured to transfer the load in the vehicle width direction to the support portion.

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