JP2021160508A - Lower structure of electric vehicle - Google Patents

Abstract

To protect a battery unit by enhancing mounting rigidity of the battery unit to a floor without inviting inconvenience such as weight increase in a vehicle body.SOLUTION: In a lower structure of an electric vehicle mounted with a battery unit 12 below a floor 11, battery modules 21 of the battery unit 12 are arranged on the left and right across a tunnel part 13b swelling upward in such a manner that a cross section is formed into a substantially arch shape in a center in a vehicle width direction of the floor 11, and extending in a vehicle longitudinal direction. Tunnel part side portions of the battery modules 21 are fastened to left and right fastening parts 13c higher than a floor general surface in the tunnel part 13b. The ceiling surface of the tunnel part 13b is provided with tunnel reinforcements 91 coupled so as to connect between the left and right fastening parts 13c and reinforcing the tunnel part 13b, and a reinforcement member 92 over between the fastening parts 13c below the tunnel reinforcement 91 is provided so as to enhance rigidity of the vicinity of the fastening parts 13c by a ring structure.SELECTED DRAWING: Figure 7

Description

The present invention relates to a substructure of an electric vehicle such as a plug-in hybrid vehicle in which a battery unit is mounted below the floor.

As the structure as described above, as disclosed in Patent Document 1 below, an upper cross member and a lower cross member are provided between the left and right floor frames under the floor, and the battery unit is sandwiched between them. There is something to attach. The battery unit is fixed to both the upper cross member and the lower cross member.

In this configuration, the collision load input to the floor frame at the time of a side collision is transmitted to the upper and lower cross members, and the individual load transmission load of those cross members is reduced.

However, a large load is likely to be applied to the lower cross member on which the battery unit is mounted. In particular, a force that tries to bend downward convexly acts on the central portion of the lower cross member in the longitudinal direction with this portion as a bending point. If the cross member breaks in the center, the battery unit will be damaged, so we want to ensure the rigidity of the cross member. A new problem arises, which leads to the narrowing of the accommodation space.

Japanese Patent No. 5654039

Therefore, the main object of the present invention is to protect the battery unit without causing inconvenience such as an increase in the weight of the vehicle body.

The means for that is a substructure of an electric vehicle in which the battery unit is mounted below the floor, and the battery module of the battery unit bulges upward in a substantially arched cross section at the center of the floor in the vehicle width direction. It is arranged on the left and right sides of the tunnel portion extending in the front-rear direction of the vehicle, and the tunnel portion side portion of the battery module is fastened to the left and right fastening portions higher than the floor general surface in the tunnel portion, and the left and right fastenings are fastened. A tunnel reinforcement for reinforcing the tunnel portion between the fastening portions is provided between the portions, and a reinforcing member straddling the fastening portions and being fastened to the tunnel portion with a gap from the tunnel reinforcement. It is a substructure of an electric vehicle equipped with.

In this configuration, the battery unit is fixed to the tunnel portion of the floor, and it is possible to prevent the central portion of the battery unit from being convexly displaced downward in the event of a side collision. Moreover, the left and right battery modules fastened to the tunnel portion have an annular structure between the tunnel portion side portions by the tunnel reinforcement and the reinforcing member. Therefore, the mounting rigidity of the battery module with respect to the tunnel portion is high.

In one aspect of the present invention, the reinforcing member may be extended in the front-rear direction of the vehicle along the arrangement position of the battery unit.

In this configuration, the mounting rigidity to the tunnel portion is effectively improved by the reinforcing member that is long in the front-rear direction of the vehicle.

When the reinforcing member is extended in the front-rear direction, the battery module is fixed to the tunnel portion by a plurality of the fastening portions arranged in the front-rear direction of the vehicle, and the reinforcing member is provided between the plurality of fastening portions. The configuration may be extended over the straddle.

In this configuration, since the reinforcing member extends in the front-rear direction of the vehicle together with the portion where the battery module is fastened, the mounting rigidity to the tunnel portion is further improved.

According to the present invention, by using the tunnel portion, it is possible to prevent the central portion of the battery unit from being displaced downward in a convex manner at the time of a side collision, so that inconvenience such as an increase in the weight of the vehicle body is not caused. The battery unit can be protected. Moreover, since an annular structure formed by the tunnel reinforcement and the reinforcing member is formed in the tunnel portion, the mounting rigidity to the floor can be increased and the effect of battery protection can be further ensured.

Schematic front view of the substructure of an electric vehicle. The schematic front view which shows the separated state of the substructure of an electric vehicle. Top view of the battery unit stacked on the frame member. Perspective view of the frame member. AA cross-sectional view and BB cross-sectional view of FIG. The cut end view of the portion corresponding to CD of FIG. 3 in the lower structure. The cut end view of the portion corresponding to EF of FIG. 3 in the lower structure. A perspective view of the tunnel section looking up from below. The perspective view of the state where the battery unit is fixed to the frame member.

An embodiment for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic front view of the lower structure of the electric vehicle. This lower structure is a structure that effectively improves the mounting rigidity of the battery unit 12 mounted below the floor 11 with respect to the floor 11.

As shown in FIG. 2, which is a schematic front view showing a separated state of the lower structure, the lower structure is provided with side sills 14 which are skeleton members having a closed cross section at both ends of the floor panel 13 constituting the floor 11 in the vehicle width direction. There is. The side sill 14 extends in the front-rear direction of the vehicle, and a joint portion 13a at the end of the floor panel 13 is connected to the upper end portion of the inner side surface.

The floor panel 13 has a tunnel portion 13b in the center in the vehicle width direction in which drive system components (not shown) are arranged. The tunnel portion 13b bulges upward in a substantially arched cross section and extends in the front-rear direction of the vehicle.

A pair of floor frames 15 are provided on the lower surface of the floor panel 13 and on the outer side in the vehicle width direction (outer side of the vehicle). The left and right floor frames 15 are also skeleton members having a closed cross section like the side sills 14, and extend in the front-rear direction of the vehicle. The formation position of the floor frame 15 with respect to the floor panel 13 is appropriately set, but in the portion where the battery unit 12 is provided, it is set to the outermost side in the vehicle width direction, and the outer surface of the floor frame 15 in the vehicle width direction is the side sill 14. It is connected to the inner surface. That is, the floor frame 15 is arranged below both ends of the floor panel 13 connected to the side sill 14 in the vehicle width direction, and is connected to the inner side surface of the side sill 14 together with the floor panel 13.

The battery unit 12 is attached from below so as to be disposed between the left and right floor frames 15 below the floor 11 having the above-mentioned schematic structure.

The battery unit 12 has two battery modules 21 on the left and right corresponding to the vehicle width direction, and these left and right battery modules 21 are connected by a connecting portion 22 at the rear portion corresponding to the rear of the vehicle to be integrated. There is. Further, the battery module 21 has a lower case 21a and an upper case 21b, which are fixed to each other by fasteners. The left and right battery modules 21 are not necessarily the same shape or symmetrical shape. The battery modules 21 in the illustrated example have different shapes and different lengths in the front-rear direction of the vehicle.

Below the battery unit 12, a frame member 16 is provided so as to cover the battery unit 12.

The frame member 16 has left and right vertical frames 61 extending in the front-rear direction on the outside of the battery unit 12, and horizontal frames 62 for connecting the left and right vertical frames 61 to each other.

FIG. 3 shows a state in which the battery unit 12 is stacked on the frame member 16. Further, FIG. 4 is a perspective view of the frame member 16. The white arrows in FIGS. 3 and 4 are for assisting in understanding the drawings, and "Fr" and "Rr" in the arrows represent "front" and "rear" of the vehicle, respectively. Therefore, the direction connecting "Fr" and "Rr" is the front-rear direction of the vehicle. The same applies to other figures.

As shown in these figures, the vertical frame 61 of the frame member 16 has a closed cross section having a square cross section, and is configured by connecting both end edges of the outer member 61a and the inner member 61b to each other. The length of the vertical frame 61 is set to be the same as or slightly longer than the length of the battery unit 12 in the vehicle front-rear direction.

As shown in FIG. 3, the arrangement interval of the left and right vertical frames 61 is the same as or slightly longer than the length of the battery unit 12 in the vehicle width direction. In other words, the left and right vertical frames 61 are arranged at intervals so that the battery unit 12 can be accommodated. In other words, the distance between the boundary between the battery unit 12 mounted so as to be arranged between the floor frames 15 and the vertical frame 61 of the frame member 16 provided so as to cover the battery unit 12 is approximately the floor frame 15. It is set to correspond to the interval of.

The horizontal frame 62 is not a plate shape having an expanded surface but a rod shape, and a plurality of horizontal frames 62 are provided with a gap in the front-rear direction corresponding to the vehicle front-rear direction. Since the left and right vertical frames 61 are connected by a plurality of horizontal frames 62, the frame member 16 has a frame shape.

In this example, there are three horizontal frames 62, from the front side in the vehicle front-rear direction, the front side horizontal frame 62a, the intermediate horizontal frame 62b, and the rear side horizontal frame 62c. The front lateral frame 62a and the rear lateral frame 62c are formed in a straight line, and the intermediate lateral frame 62b is formed in a plan view X-shape in which both side portions in the longitudinal direction are bifurcated.

Each horizontal frame 62 has a lower member 63 and an upper member 64 that are coupled and integrated with each other as shown in FIG. 5 (a), which is a cross-sectional view taken along the line AA of FIG. The lower member 63 and the upper member 64 are connected to each other at the edge portion 62d, and a space 62e for separating the lower member 63 and the upper member 64 is formed at a portion between the edge portions 62d. It has a closed cross-section structure.

Of each of the horizontal frames 62, the horizontal frame 62 having a portion facing the center of the battery module 21 in the vehicle width direction in the middle portion in the longitudinal direction corresponding to the center in the vehicle width direction is penetrated for fixing to the battery unit 12. The hole 65 is formed. That is, in the case of the battery module 21 of the illustrated example, there are two at the intermediate portion in the longitudinal direction of the intermediate horizontal frame 62b and the rear lateral frame 62c, which correspond to the center of the battery module 21 in the vehicle width direction. Through holes 65 are arranged side by side.

The through hole 65 is formed in a bulging portion 66 in which both the upper member 64 and the lower member 63 are projected upward. The bulge 66 has a circular shape in a plan view, and has a recess 67 below which the head of the bolt is housed (see FIG. 6).

Each lateral frame 62 has upright portions 71 extending upward at both ends in the longitudinal direction. The upright portion 71 is a portion fixed to the inner side surface of the vertical frame 61 and is a mounting portion provided for fixing to the vehicle body side, specifically, the floor frame 15. The height of the upright portion 71 is substantially the same as the height of the vertical frame 61.

The upright portion 71 is configured as shown in FIG. 5 (b), which is a cross-sectional view taken along the line BB of FIG. That is, both ends of the lower member 63 have standing pieces 72 that stand up upward. A raised bottom portion 73 located above the lower surface of the lower member 63 is formed at a portion of both ends of the lower member 63 corresponding to the center of the upright piece 72 in the width direction. A mounting welding nut 74 is provided on the raised bottom portion 73. The mounting welding nut 74 extends from the lower end of the frame member 16 to the floor frame 15, and the screw holes 74a are directed in the vertical direction. The height of the upper end surface of the mounting welding nut 74 is higher than the upper end position of the standing piece 72.

The upper member 64 is formed with a covering portion 75 for wrapping the mounting welding nut 74 at both ends in the longitudinal direction, and the covering portion 75 has a pair of inclined surfaces 75a at a position where the mounting welding nut 74 is sandwiched and a mounting welding nut 74. It has a vertical surface 75b at a position along the above.

The outer end of the horizontal frame 62 having such an upright portion 71 extends upward to the floor frame 15 height position so as to embrace the mounting welding nut 74, so to speak.

Through holes 72a are formed in two places sandwiching the mounting welding nut 74 in the upright piece 72 of the lower member 63, or in one place adjacent to the mounting welding nut 74, and correspond to the through holes 72a on the inner surface. The nut 76 is welded. The through hole 72a and the nut 76 have a structure for connecting to the vertical frame 61.

That is, through holes 61c and 61d through which bolts 77 can be inserted are formed in the vertical frame 61 corresponding to the positions where the three horizontal frames 62 are fixed. A bolt is inserted into the through holes 61c and 61d from the outer surface of the vertical frame 61, and the tip of the bolt 77 is screwed into the nut 76 on the inner surface of the upright piece 72 to connect the vertical frame 61 and the horizontal frame 62. The frame member 16 is configured.

When connecting the vertical frame 61 and the horizontal frame 62, the lower end position of the vertical frame 61 and the lower end position of the horizontal frame 62 are aligned at the same height. Since the horizontal frame 62 has vertical portions 71 at both ends and is coupled to the vertical frame 61 by aligning the heights of the lower ends, the horizontal frame 62 is arranged closer to the lower part of the vertical frame 61.

Further, the upper end of the mounting welding nut 74, which is higher than the upper end position of the standing piece 72, is located above the upper surface of the vertical frame 61.

A recess 61e for accommodating the head of the bolt 77 is formed in a portion of the outer member 61a of the vertical frame 61 where the through hole 61c through which the bolt 77 is inserted is formed.

An undercover 78 is provided on the lower surface of the frame member 16. The undercover 78 has a single plate shape and covers between the front horizontal frame 62a and the intermediate horizontal frame 62b and between the intermediate horizontal frame 62b and the rear horizontal frame 62c. Between the branch portions at both ends of the intermediate horizontal frame 62b is an opening 79 that is not covered with an undercover.

The undercover 78 is fixed by welding or the like to the lower surface of the edge portion 62d of each horizontal frame 62 as shown in FIG. 5A.

In the lower structure composed of the above-mentioned parts, as shown in FIG. 7, the tunnel portion side portion of the battery module 21 is the general surface of the floor 11 in the tunnel portion 13b, that is, the main surface of the floor 11. It is fastened to the higher left and right (both sides in the vehicle width direction) fastening portions 13c. FIG. 7 is a cut end view of a portion of the substructure corresponding to EF in FIG.

The fastening portion 13c is composed of a fixing portion forming member 81 provided on the ceiling surface of the tunnel portion 13b. The fixing portion forming member 81 is formed at the upper end portion of the tunnel portion 13b, which is inside the outer end of the tunnel portion 13b of the floor panel 13. The fixing portion forming member 81 has a substantially triangular shape when viewed from the longitudinal direction of the tunnel portion 13b, and is connected to the upper end corner portion on the inner surface of the tunnel portion 13b.

As shown in FIG. 8 which is a perspective view viewed from diagonally below, the fixing portion forming member 81 has a horizontal plane 81a and an upright surface 81b standing inside the vehicle on the horizontal plane 81a, and the horizontal plane 81a has a through hole 81c. doing. A nut 82 is held inside the fixing portion forming member 81 and above the through hole 81c. The fixing portion forming member 81 is provided at two locations at intervals in the front-rear direction of the vehicle.

Then, in the vicinity of the fastening portion 13c (fixed portion forming member 81), the tunnel reinforcement 91 provided between the left and right fastening portions 13c and the tunnel reinforcement 91 straddling the fastening portion 13c are vertically spaced from each other. A reinforcing member 92 is provided which is opened and fastened to the tunnel portion 13b.

The tunnel reinforcement 91 reinforces the tunnel portion 13b between the fastening portions 13c, and is formed in a shape along the inner surface of the upper end portion of the tunnel portion 13b as shown in FIG. That is, it has a ceiling surface portion 91a that corresponds to the ceiling surface of the tunnel portion 13b, and side surface portions 91b that descend downward from both the left and right sides of the ceiling surface portion 91a. The ceiling surface portion 91a and the side surface portion 91b are appropriately formed to have a width in the longitudinal direction of the tunnel portion 13b, and a bulging rib 91c connecting the side surface portions 91b on both the left and right sides and the ceiling surface portion 91a is formed in the intermediate portion in the width direction. ing.

The fixing portion forming member 81 described above is coupled to the lower surface of the tunnel reinforcement 91.

As shown in FIG. 9, the reinforcing member 92 has left and right sandwiched pieces 92a to be connected to the fastening portion 13c, and has a plate-shaped main body portion 92b connecting them. The reinforcing member 92 extends in the front-rear direction along the arrangement position of the battery unit 12, and the fixing portion forming member 81 described above is provided at two locations at intervals in the front-rear direction of the vehicle. Is formed so as to straddle between the fastening portions 13c at two front and rear positions.

A bulging rib 92c extending in the front-rear direction of the vehicle is formed on the main body portion 92b of the reinforcing member 92.

The bending of the reinforcing member 92 in the longitudinal direction corresponds to a change in the height of the tunnel portion 13b.

The battery unit 12 may be fixed to the tunnel portion 13b directly to the floor 11, but in this example, the battery unit 12 is fixed to the tunnel portion 13b via the bracket 83.

As shown in FIG. 9, the bracket 83 is fixed to the tunnel portion 13b side portion of the battery module 21, and extends upward from the upper surface of the battery module 21.

Since the pair of left and right fastening portions 13c are provided at two positions in the front and rear, the bracket 83 is composed of a pair of left and right fastening portions, and two sets are fixed in the front and rear according to the distance between the fastening portions 13c.

The structures of the two sets of four brackets 83 are the same. The bracket 83 is formed by pressing a metal plate, and has two horizontal support plates 83a at the lower end with a gap corresponding to the vehicle front-rear direction. A through hole is formed in the center of the support plate 83a. The spacing between the through holes is the same as the spacing between the through holes 27a formed in the support portion 27 of the battery module 21.

From the end of the two support plates 83a on the side corresponding to the outside in the vehicle width direction, a vertical piece 83b that stands up upward and is united is extended, and from the upper end of the vertical piece 83b, the shape of the tunnel portion 13b is formed. At the same time, an inclined piece 83c that tilts forward is extended. From the upper end of the inclined piece 83c, an upper end piece 83d extending horizontally in the direction corresponding to the inside in the vehicle width direction extends. The upper end piece 83d is a portion of the fixing portion forming member 81 in contact with the horizontal plane 81a, and has a through hole 83e in the center.

In order to fix the battery unit 12 to the tunnel portion 13b of the floor panel 13, the bracket 83 is fixed to the upper surface of the support portion 27 of the battery module 21 in advance. The bracket 83 is fixed by passing the bolt 84 through the through hole of the support plate 83a from above, inserting the bolt 84 into the through hole 27a of the support portion 27, and screwing the tip of the bolt 84 into the nut 28.

In the battery unit 12 to which the bracket 83 is fixed, the upper end piece 83d of the bracket 83 is brought into contact with the lower surface of the horizontal plane 81a of the fixing portion forming member 81 with the sandwiched piece 92a of the reinforcing member 92 interposed therebetween. In this state, when the bolt 85 is inserted from below the upper end piece 83d and screwed into the nut 82, the battery unit 12 is fixed to the tunnel portion 13b and the reinforcing member 92 is held below the ceiling surface of the tunnel portion 13b. Will be done.

As a result, an annular structure including the fastening portion 13c is formed, which is composed of a connection between the tunnel reinforcement 91 along the ceiling surface of the tunnel portion 13b and the reinforcing member 92 existing below the tunnel reinforcement 91 at intervals and extending in the left-right direction. Will be done.

In the battery unit 12 whose central portion in the vehicle width direction is fixed to the tunnel portion 13b as described above, the portion outside the vehicle width direction is also fixed to the floor 11. This fixing is made to the floor frame 15 in the same manner as the fixing of the frame member 16.

The attachment structure of the frame member 16 to the floor frame 15 is shown in FIG. FIG. 6 is a cut end view of a portion of the lower structure corresponding to CD of FIG. 3, showing a fixed structure of the frame member 16 to the floor frame 15 as well as a fixed structure of the frame member 16 to the battery unit 12. ..

That is, a cup-shaped fixing portion forming member 86 is provided at a mounting position of the frame member 16 on the lower surface of the floor frame 15. The fixing portion forming member 86 has an inner connecting piece 86a connected to the inner side surface of the floor frame 15 on the inner side in the vehicle width direction, and is horizontally connected to the lower surface of the floor frame 15 on the outer side in the vehicle width direction. It has an outer coupling piece 86b. The portion of the fixing portion forming member 86 corresponding to the vehicle front-rear direction has an inclined portion (not shown) extending upward in the vehicle front-rear direction, and the upper end portion of the inclined portion is connected to the lower surface of the floor frame 15. (Not shown) is formed.

A required number of through holes are formed on the lower surface 86c of the fixing portion forming member 86, and a nut 87 is held above the through holes inside the fixing portion forming member 86. The nut 87 is formed to a required length and penetrates the floor frame 15.

The above-mentioned required number is that the frame member 16 and the battery unit 12 fixed to the floor frame 15 are fixed at different positions in the front-rear direction. Then it becomes one.

The fixing portion forming member 86 has a cup-shaped portion including a lower surface for holding the nut 87 and a pair of inclined portions as a mountain, and is spaced between the standing portion 71 of the frame member 16 and the mounting position of the battery unit 12. It has one or more mountains depending on it.

In order to fix the frame member 16 to the floor frame 15, a bolt 88 is screwed from below into a welding nut 74 for mounting the upright portion 71 of the frame member 16, and then the tip of the bolt 88 is fixed to the fixing portion forming member. It is screwed into the nut 87 of 86. As a result, the upper end surface of the mounting welding nut 74 is pressed against the lower surface 85c of the fixing portion forming member 86.

The fixing of the battery unit 12 to the floor frame 15 on the outer side in the vehicle width direction is attached to the floor frame 15 in the same manner as the frame member 16 is fixed to the floor frame 15, so detailed description thereof will be omitted.

The center of the horizontal frame 62 in the frame member 16 in the vehicle width direction is fixed to the battery unit 12 as shown in FIG. As a result, the center of the horizontal frame 62 in the vehicle width direction is attached to the tunnel portion 13b.

Specifically, the horizontal frame 62 is fixed to the battery unit 12 by inserting bolts 89 into the through holes 65 of the intermediate horizontal frame 62b and the rear horizontal frame 62c. Of the inner side surfaces of the lower case 21a and the upper case 21b of the battery module 21 in the vehicle width direction, the vehicle inside holding portion 23 is projected from the portion corresponding to the through hole 65 of the horizontal frame 62 to hold the vehicle inside. A through hole 23a through which the bolt 89 is passed is formed in the portion 23. The upper case 21b holds the nut 24 above the through hole 23a.

At the time of fixing, the bolt 89 inserted from below into the through hole 65 of the horizontal frame 62 is inserted into the through hole 23a of the vehicle inner holding portion 23 of the battery module 21 and screwed into the nut 24 on the upper surface. In FIG. 6, reference numeral 25 denotes a cylindrical spacer.

In the lower structure configured as described above, the battery unit 12 is fastened to the tunnel portion 13b of the floor 11, and it is suppressed that the central portion of the battery unit 12 is convexly displaced downward at the time of a side collision. NS. Moreover, an annular structure composed of the tunnel reinforcement 91 and the reinforcing member 92 is formed in the portion of the tunnel portion 13b having the fastening portion 13c of the battery unit 12. Therefore, the mounting rigidity of the battery unit 12 with respect to the tunnel portion 13b is high.

Moreover, the size of the tunnel reinforcement 91 and the reinforcing member 92 can be made relatively small and lightweight as compared with the case where the plate thickness of the member receiving the collision load transmission is increased or the cross section is increased.

Further, since the reinforcing member 92 extends in the front-rear direction along the arrangement position of the battery unit 12, the mounting rigidity to the tunnel portion 13b can be effectively improved.

Moreover, since the reinforcing member 92 extends across the plurality of fastening portions 13c arranged in the front-rear direction, the mounting rigidity to the tunnel portion 13b can be further improved.

In this way, despite the compact configuration, high mounting rigidity to the tunnel portion 13b is obtained, and the central portion of the battery unit 12 is prevented from being displaced downward in a convex manner at the time of a side collision. As a result, the battery unit 12 can be protected without causing inconvenience such as an increase in the weight of the vehicle body.

Moreover, since the horizontal frame 62 having a closed cross section and high rigidity is provided and the horizontal frame 62 is also fixed to the tunnel portion 13b, the effect of protecting the battery unit 12 can be further enhanced.

11 ... Floor 12 ... Battery unit 13b ... Tunnel part 13c ... Fastening part 91 ... Tunnel reinforcement 92 ... Reinforcing member

Claims (3)

It is a substructure of an electric vehicle in which a battery unit is installed below the floor.
The battery modules of the battery unit are arranged on the left and right sides of a tunnel portion that bulges upward in a substantially arched cross section at the center of the floor in the vehicle width direction and extends in the front-rear direction of the vehicle.
The tunnel portion side portion of the battery module is fastened to the left and right fastening portions higher than the floor general surface in the tunnel portion.
A tunnel reinforcement is provided between the left and right fastening portions to reinforce the tunnel portion between the fastening portions.
A substructure of an electric vehicle including a reinforcing member straddling between the fastening portions and fastening to the tunnel portion at a distance from the tunnel reinforcement. The lower structure of an electric vehicle according to claim 1, wherein the reinforcing member extends in the front-rear direction of the vehicle along the arrangement position of the battery unit. The battery module is fixed to the tunnel portion by a plurality of the fastening portions arranged in the front-rear direction of the vehicle.
The lower structure of an electric vehicle according to claim 2, wherein the reinforcing member extends across the plurality of fastening portions.

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