Vehicle understructure

Abstract

The present invention provides a vehicle understructure that suppresses the separation of the side sill and the battery during a side collision, and also suppresses the decrease in handling stability even when vibrations are added during driving. [Solution] The vehicle 1 comprises a pair of left and right side sills 10 and a battery 13. The side sills 10 are composed of a side sill inner 101 and a side sill outer 102, and have an inner space 10a. The side sill inner 101 has a recess 101g at its lower part. The battery 13 is positioned between the side sills 19 and is fixed to each side sill 10 at multiple points in the front-rear direction. At each of the multiple points to which the side sill 10 and the battery 13 are fixed, the battery 13 is fixed to the side sill 10 at two points A1, A2 that are spaced apart from each other in the vertical direction of the vehicle 1.

Description

Technical Field

[0001] The present invention relates to a lower structure of a vehicle, and particularly to a fixing structure between a battery arranged under a floor panel and a side sill.

Background Art

[0002] In recent years, electric vehicles (BEVs) that run only on the driving force of a motor and hybrid electric vehicles (HEVs) that run by combining the driving force of an engine and the driving force of a motor have been rapidly spreading. In such vehicles, a large and high-capacity battery may be mounted below the floor panel. Patent Documents 1 and 2 disclose vehicles in which a battery is mounted below the floor panel.

[0003] In the vehicle disclosed in Patent Document 1, a battery is arranged between the left and right side sills. The battery case and the left and right side sills are fixed to each other via a frame member. ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​However, the vehicles disclosed in the above-mentioned Patent Documents 1 and 2 may suffer from problems such as battery separation from the side sill during a side collision and a decrease in handling stability due to vibrations during driving. Specifically, in the vehicles of Patent Documents 1 and 2, the left and right side sills are fixed to the frame member and battery frame at one point in a cross section perpendicular to the longitudinal direction of the vehicle. Therefore, during a side collision or when vibrations are applied, the side sills tend to rotate within the cross section around the fixing point between the side sill and the frame member and battery frame. Thus, there are concerns that the vehicles disclosed in Patent Documents 1 and 2 may suffer from problems such as battery separation from the side sill during a side collision and a decrease in handling stability due to vibrations during driving.

[0007] The present invention aims to solve the above-mentioned problems and provides a vehicle understructure that suppresses the separation of the side sill and the battery during a side collision, and also suppresses the decrease in handling stability even when vibrations due to driving are added. [Means for solving the problem]

[0008] A vehicle understructure according to one aspect of the present invention comprises a pair of left and right side sills and a battery. The pair of left and right side sills are arranged on both outer sides in the vehicle width direction at the underside of the vehicle, each extending in the longitudinal direction of the vehicle and having a closed cross-sectional structure. The battery is positioned between the pair of left and right side sills and is fixed to each of the pair of left and right side sills at multiple points in the longitudinal direction.

[0009] In the vehicle substructure according to this embodiment, the side sill and the battery are fixed at at least two locations in each of the plurality of parts to which the side sill and the battery are fixed, such that they are spaced apart from each other in the vertical direction of the vehicle.

[0010] In the above embodiment of the vehicle's understructure, the side sill and battery are fixed at at least two points in the longitudinal direction of the vehicle, where they are spaced apart from each other in the vertical direction. Therefore, compared to the structure described in Patent Documents 1 and 2, where they are fixed at only one point, rotation of the side sill within the cross-section during a side collision or when vibrations are applied is suppressed. Thus, in the above embodiment of the vehicle's understructure, separation of the side sill and battery during a side collision is suppressed, and the decrease in handling stability is also suppressed when vibrations are applied during driving.

[0011] In the vehicle understructure according to the above embodiment, each of the left and right side sills may include a side sill outer positioned on the outside in the vehicle width direction and a side sill inner positioned on the inside in the vehicle width direction and fixed to the side sill outer. In this case, the battery may be fixed to the side sill inner.

[0012] In the vehicle understructure according to the above embodiment, since the battery is fixed to the side sill inner, it is possible to suppress an increase in the size of the battery in the vehicle width direction compared to when the battery is fixed to the side sill outer. Therefore, the vehicle understructure according to the above embodiment can suppress increases in weight and manufacturing costs.

[0013] In the vehicle understructure according to the above embodiment, the side sill liner may have a recess at the lower part of the side sill liner that is recessed outward in the vehicle width direction. In this case, a portion of the battery may enter the recess and be fixed to the side sill liner with the portion that has entered.

[0014] In the above embodiment of the vehicle's understructure, the side sill has a recess at its lower end, into which a portion of the battery is inserted and secured. Therefore, compared to the case where the side sill does not have a recess, the vertical size of the battery's mounting portion relative to the side sill can be kept smaller. Thus, the above embodiment of the vehicle's understructure can achieve high space efficiency in the underside of the vehicle. Furthermore, by having a portion of the battery enter the recess, a large-capacity battery can be placed between the left and right side sills.

[0015] In the vehicle understructure according to the above embodiment, the side sill inner may include a lower vertical wall portion extending in the vertical direction in the portion facing the recess, and a lower horizontal wall portion extending inward in the vehicle width direction, continuous with the upper end of the lower vertical wall portion. In this case, the battery may include a frame provided to enter the recess. Furthermore, in each of the plurality of portions to which the side sill and the battery are fixed, the battery may be fixed to the lower vertical wall portion and the lower horizontal wall portion.

[0016] In the vehicle substructure according to the above embodiment, the battery is fixed to the lower vertical wall and lower horizontal wall of the side sill inner, so that the curved portion of the wall of the side sill inner is interposed between the fixing points which are spaced apart in the vertical direction. For this reason, the vehicle substructure according to the above embodiment can ensure higher rigidity compared to the case where the battery is fixed to the flat wall of the side sill inner at two points, due to the interposition of the curved portion.

[0017] In the vehicle substructure according to the above embodiment, the frame and the lower side wall portion may be fixed together using a bolt through which the shaft portion is inserted from below the frame upwards, and through which the lower side wall portion is also inserted.

[0018] In the lower structure of the vehicle according to the above aspect, since the frame of the battery and the lower horizontal wall portion are fixed by bolt fastening, manufacturing is easier compared to the case of fixing by welding or the like. Further, compared to fixing by welding, it is less likely that a situation such as the fixing coming off due to vibrations during vehicle travel occurs.

[0019] In the lower structure of the vehicle according to the above aspect, the frame and the lower vertical wall portion may be fixed via a bracket. In this case, the bracket includes a vertical wall portion that is fixed to the lower vertical wall portion and is provided so as to extend along the lower vertical wall portion, and a horizontal wall portion that is provided so as to extend inward in the vehicle width direction along the lower portion of the frame continuously from the upper end of the vertical wall portion and is fixed to the frame.

[0020] In the lower structure of the vehicle according to the above aspect, since the frame of the battery and the lower vertical wall portion of the side sill inner are fixed via a bracket having a vertical wall portion and a horizontal wall portion, even when the size of the battery varies depending on the vehicle type, it is possible to cope by simply preparing brackets with different differences without changing the frame of the battery or the like. Therefore, the lower structure of the vehicle according to the above aspect can suppress an increase in manufacturing cost when manufacturing many vehicle types.

[0021] In the lower structure of the vehicle according to the above aspect, the bracket and the frame may be fixed using the bolt.

[0022] In the lower structure of the vehicle according to the above aspect, the bracket and the frame of the battery are fixed using the bolt for fixing the lower horizontal wall portion of the side sill inner and the battery. Therefore, the lower structure of the vehicle according to the above aspect can reduce the number of parts compared to the case of fixing the frame of the battery and the lower horizontal wall portion of the side sill inner and the frame of the battery and the lower vertical wall portion of the side sill inner using separate fastening members. Therefore, the lower structure of the vehicle according to the above aspect can suppress an increase in weight and manufacturing cost.

[0023] In the underbody structure of the vehicle according to the above aspect, the frame may be configured to have a closed cross-sectional structure.

[0024] In the underbody structure of the vehicle according to the above aspect, since the frame of the battery is configured to have a closed cross-sectional structure, deformation and breakage of the frame due to an input load during a side collision are suppressed. Further, since the frame of the battery is configured to have a closed cross-sectional structure, generation of vibration due to deformation of the frame caused by vibration during traveling can also be suppressed.

[0025] In the underbody structure of the vehicle according to the above aspect, a pair of left and right reinforcing members may be further provided, which are disposed in the inner spaces of the pair of left and right side sills and are each configured to extend in the front-rear direction.

[0026] In the underbody structure of the vehicle according to the above aspect, since a reinforcing member is disposed in the inner space of the side sill, the load input during a side collision can be efficiently transmitted to the skeletal member (for example, cross member) on the inner side in the vehicle width direction of the side sill in cooperation with the side sill.

Advantages of the Invention

[0027] The underbody structure of the vehicle according to each of the above aspects suppresses separation between the side sill and the battery during a side collision, and also suppresses a decrease in handling stability even when vibration due to traveling is added.

Brief Description of the Drawings

[0028] [Figure 1] It is a plan view showing a partial configuration of a vehicle according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view showing a cross section taken along line II-II of FIG. 1. [Figure 3] It is a schematic view showing a fixing structure between a battery and a side sill. [Figure 4] It is a schematic view showing a fixing structure between a battery and a side sill of a vehicle according to a comparative example.

Modes for Carrying Out the Invention

[0029] Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are illustrative examples of the present invention, and the present invention is not limited to these embodiments except for its essential configuration.

[0030] In the diagrams used in the following explanation, "FR" indicates the front of the vehicle in the longitudinal direction, "RR" indicates the rear of the vehicle in the longitudinal direction, "LH" indicates the left side in the vehicle width direction, "RH" indicates the right side in the vehicle width direction, "UP" indicates the top of the vehicle in the vertical direction, and "LO" indicates the bottom of the vehicle in the vertical direction.

[0031] 1. Configuration of Vehicle 1 The configuration of vehicle 1 to which the substructure according to this embodiment is applied will be explained with reference to Figure 1. Note that Figure 1 shows only a part of the configuration of vehicle 1, and the powertrain and other components are omitted from the illustration.

[0032] As shown in Figure 1, the vehicle 1 has a powertrain mounting section 1a at the front where the powertrain is mounted, and a floor section 1b behind the powertrain mounting section 1a where the occupants sit. The floor section 1b is equipped with a pair of left and right side sills 10, a plurality of cross members 11, a floor panel 12, and a battery 13.

[0033] The left and right side sills 10 are positioned on both sides of the floor portion 1b in the vehicle width direction, and each is formed to extend in the front-rear direction.

[0034] Each of the multiple cross members 11 extends in the vehicle width direction and is fixed at both ends to a pair of left and right side sills 10.

[0035] The floor panel 12 is positioned below the multiple cross members 11 and is fixed to the side sills 10 on both sides in the vehicle width direction.

[0036] The battery 13 is located below the floor panel 12 and is fixed to the side sill 10 at multiple points in the front-rear direction on both the left and right sides in the vehicle width direction. The battery 13 transmits and receives power to and from the powertrain (not shown). In this embodiment, the battery 13 comprises battery cells made up of lithium-ion batteries or nickel-metal hydride batteries, and a battery case that houses the battery cells.

[0037] 2. Fixing structure of the battery 13 to the side sill 10 The structure for fixing the battery 13 to the side sill 10 will be explained using Figure 2. Figure 2 is a cross-sectional view showing the section along line II-II in Figure 1, and shows one of the multiple fixing points between the side sill 10 and the battery 13 in the longitudinal direction of the vehicle.

[0038] As shown in Figure 2, the side sill 10 is constructed by joining together a side sill inner 101 and a side sill outer 102, both of which have a hat-shaped cross section. The side sill 10 has a closed cross section structure with an inward hollow portion (inner space) 13a due to the joining of the side sill inner 101 and the side sill outer 102.

[0039] The side sill inner 101 is integrally formed from an upper flange portion 101a, an upper horizontal wall portion 101b, an upper vertical wall portion 101c, a middle vertical wall portion 101d, a lower horizontal wall portion 101e, and a lower vertical wall portion 101f. In the cross-section shown in Figure 2, the upper horizontal wall portion 101b is provided to extend inward in the vehicle width direction, continuous with the lower end of the upper flange portion 101a. The upper vertical wall portion 101c is provided to extend downward in the vertical direction, continuous with the inner end of the upper horizontal wall portion 101b in the vehicle width direction. The middle vertical wall portion 101d is provided to extend downward from a position outside the vehicle width direction of the upper vertical wall portion 101c, continuous with the lower end of the upper vertical wall portion 101c. The lower horizontal wall portion 101e is provided to extend outward in the vehicle width direction, continuous with the lower end of the middle vertical wall portion 101d. The lower vertical wall portion 101f is provided to extend downward, continuous with the outer end of the lower horizontal wall portion 101e in the vehicle width direction.

[0040] The side sill inner 101 has a recess 101g in its lower part, which is recessed outward in the vehicle width direction (towards the side sill outer 102) than the upper vertical wall 101c, due to the arrangement of the middle vertical wall portion 101d, the lower horizontal wall portion 101e, and the lower vertical wall portion 101f.

[0041] The side sill outer 102 is integrally formed from an upper flange portion 102a, an upper lateral wall portion 102b, a vertical wall portion 102c, a lower lateral wall portion 102d, and a lower flange portion 102e. In the cross-section shown in Figure 2, the upper lateral wall portion 102b is provided to extend outward in the vehicle width direction, continuous with the lower end of the upper flange portion 102a. The vertical wall portion 102c is provided to extend downward, continuous with the outer end of the upper lateral wall portion 102b in the vehicle width direction. The lower lateral wall portion 102d is provided to extend inward in the vehicle width direction, continuous with the lower end of the vertical wall portion 102c. The lower flange portion 102e is provided to extend downward, continuous with the inner end of the lower lateral wall portion 102d in the vehicle width direction.

[0042] The side sill inner 101 and the side sill outer 102 are joined by their respective upper flange portions 101a and 102a, and by the lower part of the lower vertical wall portion 101f and the lower flange portion 102e, so that a hollow portion (internal space) 10a is formed inside them. This constitutes a closed cross-sectional side sill 10.

[0043] A reinforcing member 14 is housed in the inner space 10a of the side sill 10. The reinforcing member 14 is housed in the inner space 10a of each of the left and right side sills 10.

[0044] The reinforcing member 14 is a member integrally formed using a metal material. Specifically, the reinforcing member 14 is made of an aluminum alloy and formed by extrusion molding or pultrusion molding. The reinforcing member 14 comprises an outer portion 14a, an intermediate portion 14b, and an inner portion 14c, each having an annular cross-sectional shape. The reinforcing member 14 has a closed cross-sectional structure and is arranged in the inner space 10a of the side sill 10 so as to extend in the longitudinal direction of the vehicle 1.

[0045] The reinforcing member 14 is fixed to the upper vertical wall portion 101c of the side sill inner 101. Specifically, the reinforcing member 14 is positioned so that its inner portion 14c abuts against the upper vertical wall portion 101c of the side sill inner 101, and is fixed at the abutment portion by fastening a bolt BLT1. A spacer may be interposed between the inner portion 14c of the reinforcing member 14 and the inner wall surface of the upper vertical wall portion 101c of the side sill inner 101. In addition, the side sill 10 and the reinforcing member 14 may be fixed via a bracket.

[0046] The upper side wall portion 101b of the side sill inner 101 is joined to the vehicle width direction end of the cross member 11. The upper side wall portion 101b of the side sill inner 101 and the cross member 11 may be joined via a bracket in between.

[0047] Furthermore, the upper vertical wall portion 101c of the side sill inner 101 is joined to the end portion of the floor panel 12 in the vehicle width direction. The upper vertical wall portion 101c of the side sill inner 101 and the floor panel 12 may also be joined via a bracket.

[0048] The battery 13 comprises a battery case (not shown) that houses battery cells and a frame 131 joined to the battery case. The frame 131 is positioned so that a portion of it enters the recess 101g of the side sill inner 101 from the inside in the vehicle width direction.

[0049] The battery 13 is fixed to the side sill inner 101 at two points: the lower horizontal wall portion 101e and the lower vertical wall portion 101f, via the frame 131. In other words, the battery 13 is fixed to the side sill 10 at two points A1 and A2. The fixing points A1 and A2 on the side sill 10 are spaced apart from each other in the vertical direction of the vehicle 1.

[0050] The frame 131 of the battery 13 is fixed to the fixing point A1 of the lower side wall portion 101e of the side sill inner 101 by fastening a bolt BLT2 and a nut NT1. Specifically, the shaft of the bolt BLT2 is inserted from below to above the frame 131, and also passes through the lower side wall portion 101e of the side sill inner 101, and the nut NT1 is screwed onto the inner wall surface of the lower side wall portion 101e. A sleeve may be inserted between the shaft of the bolt BLT2 and the frame 131 of the battery 13.

[0051] Furthermore, the frame 131 of the battery 13 is fixed to a fixing point A2 at the lower part of the lower vertical wall portion 101f of the side sill inner 101 via a bracket 15. The bracket 15 has a vertical wall portion 15a that extends vertically along the outer wall surface of the lower vertical wall portion 101f of the side sill inner 101, and a horizontal wall portion 15b that is continuous with the upper end of the vertical wall portion 15a and extends inward in the vehicle width direction and is provided along the lower wall surface of the frame 131.

[0052] The bracket 15 has a vertical wall portion 15a that overlaps the lower part of the lower vertical wall portion 101f of the side sill inner 101 and the lower flange portion 102e of the side sill outer 102, and is fixed to the side sill 10 by a bolt BLT3 having a shaft portion that passes through the overlapping portion and a nut NT2 that is screwed onto the bolt BLT3 (fixing point A2).

[0053] Furthermore, the bracket 15 has its side wall portion 15b overlapping the portion of the frame 131 through which the bolt BLT2 is inserted, and the bolt BLT2 and nut NT1 are fastened together at the overlapping portion by screwing them together.

[0054] With the above configuration, the battery 13 is fixed to the side sill 10 at two locations A1 and A2, spaced apart from each other in the vertical direction of the vehicle 1. Although Figure 2 shows a single cross-section of the side sill 10 in the longitudinal direction (front-rear direction of the vehicle 1), the other fixing points between the side sill 10 and the battery 13 in the front-rear direction have a similar structure.

[0055] Furthermore, while the above describes the fixing structure between the side sill 10 located on the right side in the vehicle width direction and the battery 13, a similar structure is used for fixing between the side sill 10 located on the left side in the vehicle width direction and the battery 13.

[0056] Furthermore, in this embodiment, fixing points A1 and A2 are positioned in a single cross-section perpendicular to each other in the front-rear direction, but fixing points A1 and A2 may be slightly offset in the front-rear direction. For example, fixing points A1 and A2 may be offset by a range of 100 mm or less in the front-rear direction. This eliminates the need to consider interference between the head of the bolt BLT2 and the nut NT2, ensuring a high degree of freedom in design and manufacturing.

[0057] Furthermore, in this embodiment, a structure is adopted in which the side sill 10 and the battery 13 are fixed at two fixing points A1 and A2 that are spaced apart in the vertical direction, in one of the multiple fixing points between the side sill 10 and the battery 13. However, the side sill 10 and the battery 13 may be fixed at three or more fixing points that are spaced apart in the vertical direction.

[0058] 3. Effects In this embodiment, the lower structure of the vehicle 1 is fixed at two points (fixing points A1 and A2) where the side sill 10 and the battery 13 are spaced apart in the vertical direction, at each fixing point between the side sill 10 and the battery 13 in the longitudinal direction of the vehicle 1. Compared to the structure in Patent Documents 1 and 2, where they are fixed at one point, rotation of the side sill 10 within the cross-section during a side collision or vibration is suppressed. This will be explained with reference to Figures 3 and 4.

[0059] As shown in Figure 4, in the vehicle understructure of the comparative example, the side sill inner 101 and the battery 13 frame 131 are fixed at one point JP at each of the fixing points between the side sill 10 and the battery 13 in the front-rear direction. In this case, when a side impact load F is applied to the side sill 10 during a side collision, the side sill 10 will attempt to rotate around the fixing point JP (arrow B). Therefore, depending on the magnitude of the applied load F, it is possible that the fixing between the side sill 10 and the battery 13 may come undone and they may separate from each other.

[0060] Furthermore, in the comparative example shown in Figure 4, vibrations caused by the vehicle's movement also cause the side sill 10 to attempt to rotate, resulting in vibrations in the vehicle.

[0061] In contrast, as shown in Figure 3, in the vehicle 1 according to this embodiment, at each of the fixing portions between the side sill 10 and the battery 13 in the front-rear direction, there are two locations JP where the side sill inner 101 and the frame 131 of the battery 13 are spaced apart from each other in the vertical direction. U ,JP L It is fixed in place at JP. Note that in Figure 3, the fixing point is JP. U This is the fixing point A1 in Figure 2, and the fixing point JP L This is the fixing point A2 in Figure 2.

[0062] As shown in Figure 3, the lower structure of the vehicle 1 according to this embodiment has two locations JP that are spaced apart in the vertical direction. U ,JP L By fixing the side sill 10 and the battery 13 together, rotation of the side sill 10 is suppressed even when a side impact load F is applied during a side collision. Therefore, in the vehicle 1 according to this embodiment, separation of the side sill 10 and the battery 13 is suppressed, and a decrease in steering stability is also suppressed even when vibrations due to driving are added.

[0063] Furthermore, in the vehicle 1 according to this embodiment, since the battery 13 is fixed to the side sill inner 101, the increase in the size of the battery 13 in the vehicle width direction can be suppressed compared to the case where the battery 13 is fixed to the side sill outer 102. Therefore, the increase in weight and manufacturing cost of the vehicle 1 can be suppressed.

[0064] Furthermore, in this embodiment, the understructure of the vehicle 1 has a recess 101g at the bottom of the side sill inner 101 of the side sill 10, and a part of the frame 131 of the battery 13 enters into the recess 101g and is fixed therein. As a result, the understructure of the vehicle 1 can reduce the vertical size of the part of the battery that is fixed to the side sill inner 101 of the side sill 10 compared to the case where the side sill inner 101 of the side sill 10 does not have a recess. Thus, the understructure of the vehicle 1 can achieve high space efficiency in the lower part of the vehicle 1. In addition, by adopting a configuration in which a part of the frame 131 enters into the recess 101g, a large-capacity battery 13 can be mounted while maintaining the spacing between the side sills 10.

[0065] Furthermore, in the lower structure of the vehicle 1 according to this embodiment, the frame 131 of the battery 13 is fixed to the lower vertical wall portion 101f and the lower horizontal wall portion 101e of the side sill inner 101. Therefore, the bent portion of the wall portion of the side sill inner 101 (the bent portion at the boundary between the lower vertical wall portion 101f and the lower horizontal wall portion 101e) is interposed between the fixing points A1 and A2, which are spaced apart in the vertical direction. As a result, the lower structure of the vehicle 1 can ensure higher rigidity compared to the case where the frame 131 of the battery 13 is fixed to the flat wall portion of the side sill inner 101 at two points, due to the interposition of the bent portion.

[0066] Furthermore, in this embodiment, the lower structure of the vehicle 1 is fixed to the frame 131 of the battery 13 and the lower side wall portion 101e of the side sill inner 101 by fastening with bolts BLT2, which makes manufacturing easier compared to fixing by welding or other methods. Also, compared to fixing by welding, it is less likely that the fixing will come loose due to vibrations during vehicle 1 operation. In addition, the battery 13 can be easily replaced when the vehicle 1 is used for a long period of time.

[0067] Furthermore, in the lower structure of the vehicle 1 according to this embodiment, the frame 131 of the battery 13 and the lower vertical wall portion 101f of the side sill inner 101 are fixed via a bracket 15 having a vertical wall portion 15a and a horizontal wall portion 15b. Therefore, even if the size of the battery 13 differs depending on the vehicle model, it is possible to accommodate this by simply preparing brackets 15 of different sizes without changing the frame 131 of the battery 13, etc. Thus, the lower structure of the vehicle 1 can suppress increases in manufacturing costs when manufacturing many vehicle models.

[0068] Furthermore, in this embodiment, the lower structure of the vehicle 1 is fixed to the frame 131 of the battery 13 using bolts BLT2 that fix the lower horizontal wall portion 101e of the side sill inner 101 and the frame 131 of the battery 13. Therefore, the lower structure of the vehicle 1 can reduce the number of parts compared to the case where the fixing of the frame 131 of the battery 13 to the lower horizontal wall portion 101e of the side sill inner 101 and the fixing of the frame 131 of the battery 13 to the lower vertical wall portion 101f of the side sill inner 101 are done using separate fastening members. Thus, the lower structure of the vehicle 1 can suppress increases in weight and manufacturing costs.

[0069] Furthermore, in the lower structure of the vehicle 1 according to this embodiment, the frame 131 of the battery 13 is configured with a closed cross-section structure, which suppresses deformation or damage to the frame 131 due to the load F applied during a side collision. In addition, because the frame 131 of the battery 13 is configured with a closed cross-section structure, it is also possible to suppress the generation of vibrations caused by deformation of the frame 131 due to vibrations during driving.

[0070] Furthermore, in the lower structure of the vehicle 1 according to this embodiment, a reinforcing member 14 is provided in the inner space 10a of the side sill 10, so that the load F input during a side collision can be efficiently transmitted to the skeletal member (for example, the cross member 11) on the inner side of the side sill 10 in the vehicle width direction in cooperation with the side sill 10.

[0071] As described above, the lower structure of the vehicle 1 according to this embodiment suppresses the separation of the side sill 10 and the battery 13 in the event of a side collision, and also suppresses a decrease in steering stability even when vibrations due to driving are added.

[0072] [Differentiation] In the above embodiment, a structure was adopted in which the frame 131 of the battery 13 is fixed to the side sill inner 101. However, in the present invention, the battery frame may be fixed to the side sill outer. Alternatively, the battery frame may be fixed to both the side sill inner and the side sill outer. In this case as well, it is sufficient that the side sill and the battery are fixed at at least two locations spaced apart from each other in the vertical direction.

[0073] Furthermore, in the above embodiment, the side sill inner 101 has a recess 101g, and a structure is adopted in which a part of the frame 131 of the battery 13 enters the recess 101g of the side sill inner 101. However, in the present invention, the side sill inner does not necessarily have to have a recess.

[0074] Furthermore, in the above embodiment, of the two fixing points A1 and A2 between the side sill inner 101 and the frame 131 of the battery 13, fixing point A1 is located on the lower horizontal wall portion 101e of the side sill inner 101 and fixing point A2 is located on the lower vertical wall portion 101f of the side sill inner 101. However, the present invention is not limited thereto. For example, two fixing points may be located on the lower vertical wall portion 101f of the side sill inner 101, or fixing points may be provided on the middle vertical wall portion 101d and the lower horizontal wall portion 101e of the side sill inner 101, or fixing points may be provided on the middle vertical wall portion 101d and the lower vertical wall portion 101f of the side sill inner 101.

[0075] Furthermore, in the above embodiment, the frame 131 of the battery 13 is fixed to the side sill 10, but the present invention is not limited thereto. For example, the battery case housing the battery cells may be directly fixed to the side sill.

[0076] In the above embodiment, the side sill inner 101 and the battery frame 131 are fixed at fixing point A1 using a bolt BLT2 and a nut NT1, but the present invention is not limited thereto. For example, they can also be fixed using rivets or the like. Similar variations can also be used for fixing the side sill 10 and the bracket 15.

[0077] In the above embodiment, a configuration was adopted in which the reinforcing member 14 is housed in the inner space 10a of the side sill 10, but in the present invention, the reinforcing member does not necessarily have to be housed in the inner space of the side sill.

[0078] Furthermore, in the above embodiment, the side sill inner 101 and the battery frame 131 are fixed to each other via a bracket 15 at one of the two fixing points A1 and A2 between the side sill inner 101 and the battery frame 131, A2, but in the present invention, it is not always necessary to interpose a bracket to fix the side sill inner and the battery frame. That is, the battery frame may be fixed directly to the lower part of the side sill. [Explanation of Symbols]

[0079] 1 vehicle 10 Side sill 13 Batteries 14 Reinforcement members 15 brackets 101 Side Sill Inner 131 frames A1,JP U Fixing points A2,JP L Fixing points BLT1, BLT2 bolts NT1, NT2 nuts

Claims

1. A pair of left and right side sills are provided on both outer sides in the width direction of the vehicle's lower section, each extending in the longitudinal direction of the vehicle and having a closed cross-sectional structure. A battery is positioned between the left and right pair of side sills and fixed to each of the left and right pair of side sills at multiple points in the front-rear direction, Equipped with, In each of the plurality of parts to which the side sill and the battery are fixed, the side sill and the battery are fixed at at least two locations spaced apart from each other in the vertical direction of the vehicle. The undercarriage of the vehicle.

2. Each of the pair of left and right side sills comprises a side sill outer positioned on the outside in the vehicle width direction and a side sill inner positioned on the inside in the vehicle width direction and fixed to the side sill outer. The battery is fixed to the side sill inner. The undercarriage structure of the vehicle according to claim 1.

3. The side sill inner has a recess at its lower part that is recessed outward in the vehicle width direction, The battery is partially inserted into the recess and fixed to the side sill liner at the portion that has entered. The undercarriage structure of the vehicle according to claim 2.

4. The side sill inner comprises, in the portion facing the recess, a lower vertical wall portion provided to extend along the vertical direction, and a lower horizontal wall portion provided to extend inward in the vehicle width direction, continuous with the upper end of the lower vertical wall portion. The battery comprises a frame provided to enter the recess, In each of the plurality of parts to which the side sill and the battery are fixed, the battery is fixed to the lower vertical wall and the lower horizontal wall. The undercarriage structure of a vehicle according to claim 3.

5. The frame and the lower side wall are fixed together using a bolt through which the shaft portion is inserted from below to above the frame, and which also passes through the lower side wall. The undercarriage structure of the vehicle according to claim 4.

6. The frame and the lower vertical wall are fixed together via brackets. The bracket has a vertical wall portion fixed to the lower vertical wall portion and extending along the lower vertical wall portion, and a horizontal wall portion that is continuous with the upper end of the vertical wall portion and extends inward in the vehicle width direction along the lower part of the frame and is fixed to the frame. The undercarriage structure of the vehicle according to claim 5.

7. The bracket and the frame are fixed together using the bolts. The undercarriage structure of a vehicle according to claim 6.

8. The frame is constructed with a closed cross-sectional structure. The undercarriage structure of the vehicle according to claim 4.

9. The system further comprises a pair of left and right reinforcing members, each disposed in the inner space of the pair of left and right side sills and configured to extend in the front-rear direction. The undercarriage structure of a vehicle according to any one of claims 1 to 8.

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