JP2018140728A - Floor structure of electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a layout space for electrical components and efficiently transfer an impact load input from a front side frame to a side sill for absorption.SOLUTION: A floor structure of an electric vehicle includes: a battery pack installation frame 16 having a battery side right-angle part 14; a pair of front side frames 42; a pair of side sills 18; and a front side frame support part 44 supporting each of rear ends of a pair of front side frames 42 at a floor front part. The front side frame support part 44 includes: a vehicle body side right-angle part which corresponds to the battery side right-angle part 14 and which is provided between the front side frame support part 44 and the side sill 18; a front fastening part 26 for connecting the front side frame support part 44 with the battery pack installation frame 16; and a lateral fastening part 28 for connecting the side sill 18 with the battery pack installation frame 16 through the vehicle body side right-angle part.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a floor structure of an electric vehicle.

  For example, Patent Document 1 discloses a vehicle body structure of an electric vehicle in which a space for storing an electrical component (for example, a battery) is formed by a main frame and a sub frame.

  In the vehicle body structure disclosed in Patent Document 1, a main frame formed of a rectangular frame body by front and rear cross members and left and right side sills, and a sub-frame connected to the main frame from below. A storage space for electrical components is formed by the frame. In addition, a rear end of a pair of front side frames that extend substantially in parallel along the vehicle front-rear direction is connected to the front cross member that constitutes the main frame.

JP 2008-182295 A

  In general, the rigidity of the side sill is higher than that of other members. Therefore, by transmitting the collision load (front collision load) input from the front side frame to the side sill, the collision load is efficiently transmitted. Can be absorbed. However, in the vehicle body structure disclosed in Patent Document 1, it is possible to secure an arrangement space for electric parts (batteries), but the collision load (front collision load) input from the front side frame is efficiently applied to the left and right side sills. Seems to be difficult to communicate.

  That is, in the vehicle body structure disclosed in Patent Document 1, since the main frame to which the rear end of the front side frame is connected is configured by a rectangular frame, a collision load (front collision) input from the front side frame is formed. This is because it is difficult to smoothly transmit the load to the side sill.

  The present invention has been made in view of the above points, and it is possible to secure an arrangement space for electrical components and efficiently transmit and absorb a collision load input from the front side frame to the side sill. It aims at providing the floor structure of an electric vehicle.

  In order to achieve the above object, the present invention provides a battery pack mounting frame having at least one battery side right-angled portion at a front portion on the front side of the vehicle in a plan view, and disposed on the front side of the vehicle. A pair of front side frames arranged side by side in the direction, a pair of side sills arranged on both sides of the battery pack mounting frame in the vehicle width direction, and a rear end of the pair of front side frames in front of the floor A front side frame support portion that is respectively supported by a portion, and the front side frame support portion corresponds to the battery side right angle portion, and is provided between the front side frame support portion and the side sill. A front fastening portion that joins the front side frame support portion and the battery pack mounting frame, and the vehicle Through the side right-angled portions, characterized by having a a lateral fastening portion for coupling the said side sill battery pack mounting frame.

  The present invention can provide a floor structure for an electric vehicle that can secure an arrangement space for electric parts and can efficiently transmit and absorb a collision load inputted from a front side frame to a side sill.

It is the bottom view which looked at the body frame to which the floor structure of the electric vehicle concerning the embodiment of the present invention was applied from the body lower surface side. FIG. 2 is an enlarged bottom view of the front part of the vehicle body frame shown in FIG. 1. FIG. 2 is an enlarged plan view of the vehicle body frame shown in FIG. 1 viewed from the upper surface side of the vehicle body. It is an enlarged side view of a vehicle body frame front part. It is a perspective view of a battery pack mounting frame. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a partial bottom view which shows the state which removed the sub-frame from the state shown in FIG. It is a partial bottom view which shows the state which removed the battery pack mounting frame from the state shown in FIG. It is a partially broken perspective view of the front side frame support part connected to a side sill. FIG. 10 is a partial cross-sectional perspective view taken along line XX in FIG. 9. It is a cross-sectional schematic diagram along the X1-X1 line of FIG. It is a longitudinal cross-sectional view along the vehicle front-back direction of a front side frame support part. It is the partial cross section perspective view which looked at FIG. 12 from diagonally upward direction. It is the perspective view which looked at the support part main body of the front side frame support part from diagonally back. It is a figure used for description of the state where the load transmitted from the front side frame is distributed and transmitted to the pair of side sills on both sides in the vehicle width direction. It is a partial cross section perspective view which shows the front side frame support part which concerns on a modification.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, “front and rear” indicates the vehicle longitudinal direction, “left and right” indicates the vehicle width direction (left and right direction), and “up and down” indicates the vertical vertical direction.

  As shown in FIG. 1, the electric vehicle 10 has a body frame 12. The vehicle body frame 12 includes a vehicle body frame front portion 12a, a vehicle body frame rear portion 12b, and a battery storage portion 12c that is disposed between the vehicle body frame front portion 12a and the vehicle body frame rear portion 12b and stores a battery as an electrical component. Configured. In addition, an electrical component is not limited to a battery, For example, a fuel cell etc. are also included.

  As shown in FIGS. 1 and 5, the battery storage portion 12 c has at least one (two in this embodiment) battery-side right-angle portions 14 at the front portion on the front side of the vehicle in plan view. A pack mounting frame 16 and a pair of left and right side sills 18 disposed on both sides of the battery pack mounting frame 16 along the vehicle width direction are provided.

  As shown in FIGS. 5 and 6, the battery pack mounting frame 16 includes a box portion 22 that houses one or a plurality of battery packs 20, a hollow frame-shaped frame portion 24 that supports the box portion 22, and A fastening member 30 is provided which is fixed to the outside of the frame portion 24 and has a front fastening portion 26 and a lateral fastening portion 28 (see FIG. 7).

  The box portion 22 includes a bottom wall 22a that is substantially rectangular in plan view, a side wall 22b that surrounds the periphery of the bottom wall 22a and rises upward from the periphery of the bottom wall 22a, a front end of the side wall 22b, and And a flange 22c provided at the left right end. A space for storing the battery pack 20 is formed by the bottom wall 22a and the side wall 22b. As shown in FIG. 11, the space portion is closed by a cover member 33 disposed between the lower side of the floor panel 31 and the upper end of the box portion 22.

  The frame portion 24 has a substantially rectangular shape that surrounds and supports the periphery of the side wall 22b of the box portion 22, and is configured by a hollow frame body having a closed cross section inside. A lower flange 24a extending toward the box portion 22 is provided at the lower portion of the frame portion 24 (see FIG. 11). The lower flange 24 a is joined to the lower surface of the bottom wall 22 a of the box portion 22.

  The to-be-fastened member 30 consists of a frame body which exhibits a substantially U shape in plan view (see FIG. 1), and a front frame body and left and right side frame bodies along the vehicle width direction are integrally configured. ing. As shown in FIG. 11, the fastened member 30 includes an upper wall 30a, a vertical wall 30b, a bent wall 30c, and an inclined wall 30d. The upper wall 30 a has a plurality of bolt insertion holes 32 and is provided at a position lower than the upper end 24 b of the frame portion 24. The vertical wall 30b extends in the vertical upward direction continuously from the upper wall 30a and is joined to the frame portion 24. The bent wall 30c is formed so as to be bent downward from the upper wall 30a.

  As shown in FIG. 11, the inclined wall 30 d is formed to incline so as to fall from the lower end of the bent wall 30 c toward the frame portion 24, and its end is coupled to the lower surface of the frame portion 24. . Bolt mounting holes 30e for mounting the bolts B are formed in the inclined wall 30d. In addition, the to-be-fastened member 30 and the bolt insertion hole 32 function as the front fastening part 26 and the horizontal fastening part 28 so that it may mention later.

  As shown in FIGS. 7 to 11, the front fastening portion 26 is arranged in the vehicle width direction on the upper wall 30 a (see FIG. 11) of the fastened member 30 and the rear end of the subframe rear mounting portion 34 described later. A plurality are arranged along. A plurality of lateral fastening portions 28 are arranged along the vehicle front-rear direction on a flat surface portion 60a (see FIG. 9) and a side sill inner 18a of a load transmitting portion 60 described later. The front fastening portion 26 and the lateral fastening portion 28 are fastened by, for example, a bolt B and a nut N that function as fastening means.

  Returning to FIG. 5, the battery pack mounting frame 16 includes a single vertical frame 36 extending substantially in the center of the box portion 22 along the vehicle front-rear direction, and an upper surface of the bottom wall of the box portion 22 adjacent to the pair of left and right side sills 18. Each battery support frame 38 is disposed on the inner wall bottom surface and extends in the vehicle front-rear direction, and a plurality of battery-side cross members 40 disposed along the vehicle width direction substantially orthogonal to the vertical frame 36.

  As shown in FIGS. 1 to 4, the vehicle body frame front portion 12 a includes a pair of left and right front side frames 42, a pair of left and right front side frame supports 44, a subframe (front subframe) 46, and a pair of left and right front sides. Upper member 48 and a dash lower panel (dashboard lower) 50. A pair of left and right front cross members 52 extending outward in the vehicle width direction are connected to the front ends of the pair of left and right front side frames 42, respectively.

  Since the pair of left and right front side frames 42 and the front side frame support 44 are symmetrically arranged, the left front side frame 42 and the front side frame support 44 will be described in detail, and the right front side Description of the frame 42 and the front side frame support 44 is omitted. The sub-frame 46 includes a pair of left and right side frames, a front cross member, a rear cross member, and the like.

  As shown in FIG. 7, the pair of left and right front side frames 42 extend substantially in parallel along the vehicle front-rear direction, and an impact load (front collision load) is input when the vehicle collides head-on. In FIG. 7, the right front side frame 42 is not shown. The rear ends of the pair of left and right front side frames 42 are supported by front side frame support portions 44 at the front part of the floor. As shown in FIG. 4, the sub-frame 46 is disposed below the pair of left and right front side frames 42, and is mounted with a power plant such as an electric motor and a suspension mechanism (not shown). The pair of left and right upper members 48 are respectively arranged on the outer sides in the vehicle width direction of the pair of left and right front side frames 42, and are arranged so as to rise from the front cross member 52 (see FIGS. 1 to 3) upward in a substantially arc shape. (See FIG. 4).

  Between the pair of left and right front side frames 42 and the pair of left and right upper members 48, wheel houses 54 surrounding left and right front wheels (not shown) are respectively provided (see FIGS. 1 to 3).

  As shown in FIGS. 7 and 8, each front side frame support portion 44 includes a support portion main body 56 that has a substantially right triangle shape in plan view. As will be described later, the support body 56 is provided with a vehicle body side right angle portion 58, a front fastening portion 26, and a lateral fastening portion 28. As shown in FIG. 14, the support portion main body 56 includes a bottom wall 56a, a front wall 56b, an inner wall 56c, a rear wall 56d, a front wall flange portion 56e, and an inner wall flange portion 56f. ing.

  As shown in FIGS. 10 and 14, the bottom wall 56 a is formed in a substantially triangular shape that gradually becomes wider from the rear end of the front side frame 42 in plan view. The front wall 56b is curved along the shape of the lower rear portion of the wheel house 54, is formed to extend outward in the vehicle width direction in plan view, and is formed to rise upward from the bottom wall 56a. Yes. The inner side wall 56c has a flat surface 56g extending along the vehicle longitudinal direction and the vertical direction. The inner side wall 56c extends along the vehicle front-rear direction on the inner side in the vehicle width direction of the bottom wall 56a, and is formed to rise upward.

  The rear wall 56d extends along the vehicle width direction and is formed to rise upward. The inner end of the rear wall 56d in the vehicle width direction is continuous so as to be substantially orthogonal to the inner wall 56c. The outer end of the rear wall 56d in the vehicle width direction is formed so as to be discontinuous from the front wall 56b by a predetermined distance. A front wall flange portion 56e that is bent outward in the vehicle width direction is provided at the upper end of the front wall 56b. An inner wall flange portion 56f that is bent inward in the vehicle width direction is provided at the upper end of the inner wall 56c. Note that a load transmitting portion 60 described later is disposed between the outer end portion of the front side frame support portion 44 and the front end of the side sill 18.

  The vehicle body side right angle portion 58 is provided on the vehicle body frame side (support body 56 and load transmission portion 60) corresponding to the battery side right angle portion 14 of the battery pack mounting frame 16, and the front side frame support portion 44, the side sill 18, It is arranged between. More specifically, the vehicle body side right-angled portion 58 is configured by combining the bottom wall 56a of the front side frame support portion 44 and the load transmitting portion 60.

  The front fastening portion 26 integrally couples the front side frame support portion 44 and the battery pack mounting frame 16 via bolts B and nuts N which are fastening means. That is, the three bolt insertion holes 62 are arranged at predetermined intervals along the vehicle width direction at a portion of the bottom wall 56a of the support portion main body 56 constituting the front side frame support portion 44 and close to the rear wall 56d. (See FIG. 8). The bolt B is inserted into each bolt insertion hole 62 formed in the bottom wall 56a of the support body 56 and the fastened member 30, and the bolt B is fastened with a nut N, whereby the front side frame support 44 and A front fastening portion 26 is formed by firmly fastening the battery pack mounting frame 16.

  A plurality of the front fastening portions 26 are arranged along the vehicle width direction at the front end of the battery pack mounting frame 16, that is, at the front portion of the floor. In the present embodiment, the three front fastening portions 26 are arranged on the vehicle rear side of the support portion main body 56, but the present invention is not limited to this. The front fastening portion 26 is also disposed in a subframe rear mount portion 34 (described later) adjacent to the inside of the support portion main body 56 in the vehicle width direction.

  The lateral fastening portion 28 integrally couples the pair of left and right side sills 18 (side sill inners 18 a) and the battery pack mounting frame 16 via the vehicle body side right angle portion 58. That is, a plurality of bolt insertion holes 64 are predetermined along the vehicle front-rear direction on the lower surfaces of the load transmitting portions 60 (described later) and the side sill 18 (side sill inner 18a) respectively disposed on the left and right sides of the battery pack mounting frame 16. They are spaced apart (see FIG. 8). By inserting the bolt B into each of the bolt insertion holes 62 and 64 formed in the load transmitting portion 60, the side sill inner 18a, and the fastened member 30, and fastening the bolt B with the nut N, a pair of left and right A lateral fastening portion 28 that firmly fastens the side sill 18 (including the load transmission portion 60) and the battery pack mounting frame 16 is configured. A plurality of lateral fastening portions 28 are arranged along the vehicle longitudinal direction on both the left and right sides of the battery pack mounting frame 16 along the vehicle width direction. As shown in FIG. 9, the lateral fastening portion 28 in the load transmitting portion 60 is configured by fastening three members including the load transmitting portion 60, the side sill inner 18 a, and the battery pack mounting frame 16 together. Yes.

  Further, as shown in FIGS. 7, 8, 10, and 14 (particularly, FIG. 10), the front side frame support portion 44 has a subframe rear mount portion 34. As shown in FIG. 10, the sub-frame rear mount 34 is a composite body in which two large and small bottomed rectangular tubular bodies 66 and 68 arranged on the vehicle front side and the vehicle rear side are integrally combined. It is configured. The large substantially bottomed rectangular cylinder 66 disposed on the front side of the vehicle has a bottom surface portion 66a and a plurality of side surface portions 66b that rise upward from the bottom surface portion 66a. The small substantially bottomed rectangular cylinder 68 disposed on the vehicle rear side includes a bottom surface portion 68a and a plurality of side surface portions 68b that rise upward from the bottom surface portion 68a.

  The outer end in the vehicle width direction of the side surface portion 66 b of the large substantially bottomed rectangular tube body 66 is connected (joined) to the inner side wall 56 c of the support portion main body 56. Further, the inner side in the vehicle width direction of the bottom surface portion 66a of the large substantially bottomed rectangular tubular body 66 is behind the subframe in which the rear end of the subframe 46 is fastened to the bottom surface portion 66a via the reinforcing plate, the bolt B, and the nut N. A fastening portion 70 is provided. The rear end of the bottom surface portion 68a of the small substantially bottomed rectangular cylinder 68 has a front fastening portion 26 fastened to the fastened member 30 of the battery pack mounting frame 16 via bolts B and nuts N.

  Furthermore, the front side frame support portion 44 has a pair of left and right load transmission portions 60 that are inclined outward in the vehicle width direction from the front wall 56b toward the side sill inner 18a. As shown in FIG. 9 and FIG. 10, each load transmitting portion 60 is joined to the front wall 56b by bending upward from the front end of the flat portion 60a and the flat portion 60a extending substantially parallel to the floor panel 31. The front part 60b to be formed and a curved part 60c formed in a belt shape that curves from the inside to the outside of the flat part 60a. The front end of the curved portion 60c is joined to the inside of the front wall 56b, and the rear end of the curved portion 60c is joined to the front end of the side sill inner 18a. A clearance 72 extending in the vertical vertical direction is formed between the inner end portion of the front surface portion 60b and the curved portion 60c (see FIG. 9). The curved portions 60c of the pair of left and right load transmitting portions 60 have a divergent shape that expands in an octagonal shape from the front wall 56b toward the pair of left and right side sill inners 18a (side sill 18) in plan view.

  Furthermore, the front side frame support portion 44 has a substantially triangular shape in plan view and has an inner wall 56c that is flat along the vehicle vertical direction. Further, the subframe rear mount portion 34 includes a subframe rear fastening portion 70 that fastens the vehicle rear end portion of the subframe 46 at the floor front portion. A sub-frame rear mount portion 34 provided with a sub-frame rear fastening portion 70 is joined to the inner wall 56c. The front side frame support portion 44 has a partition wall (first partition wall) 74 that connects the front wall 56b and the inner wall 56c. The partition wall 74 is disposed along the vehicle width direction toward the subframe rear mount portion 34.

  As described above, the front side frame support portion 44 includes the front wall 56b, the inner wall 56c, and the rear wall 56d that faces the front wall 56b. A front side frame rear fastening portion 70 for fastening the rear end of the front side frame 42 with a bolt B and a nut N is provided between the front wall 56b and the inner wall 56c along the vehicle width direction (FIG. 10). reference). In FIG. 10, the front side frame 42 is not shown.

Here, the modification of the front side frame support part 44 is shown in FIG.
In the front side frame support portion 44a according to this modified example, in addition to the partition wall (first partition wall) 74 that connects the front wall 56b and the inner wall 56c, the front wall 56b and the rear wall 56d are arranged in the vehicle longitudinal direction. A partition wall (second partition wall) 76 connected along the vehicle width direction and a partition wall (second partition wall) 78 including an inclined wall connecting the inner wall 56c and the rear wall 56d in a direction crossing the vehicle width direction are provided. This effect will be described in detail later.

  Note that the dash lower panel 50 (see FIGS. 12 and 13) includes a vertical portion extending substantially vertically upward, a horizontal portion extending substantially horizontally, and bent from the end of the horizontal portion toward the vertical portion. And a bent portion that rises obliquely.

  The vehicle body frame 12 of the electric vehicle 10 according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

  In the present embodiment, the front side frame support portion 44 connects the vehicle body side right angle portion 58 provided between the front side frame support portion 44 and the side sill 18, the front side frame support portion 44, and the battery pack mounting frame 16. And a lateral fastening portion 28 that couples the side sill 18 and the battery pack mounting frame 16 via the vehicle body-side right-angle portion 58. Thus, in the present embodiment, the battery-mounted right-angle portion 14 of the battery pack mounting frame 16 and the vehicle-body-side right-angle portion 58 of the vehicle body frame 12 having a shape corresponding to the battery-side right-angle portion 14 are provided. Space can be secured.

  In the present embodiment, the collision load (front collision load) input from the front side frame 42 is further transmitted from the front fastening portion 26 provided in the support portion main body 56 via the battery pack mounting frame 16 to the vehicle body. It can be transmitted to the lateral fastening portion 28 via the side right angle portion 58 (see FIG. 7). Thereby, in this embodiment, the collision load (front collision load) input from the front side frame 42 can be smoothly transmitted to the pair of left and right side sills 18. As a result, in the present embodiment, it is possible to secure an arrangement space for electric parts such as a battery and to efficiently transmit and absorb the collision load (front collision load) input from the front side frame 42 to the side sill 18. it can.

  Further, in the present embodiment, the battery pack mounting frame 16 is positioned lower in the vertical vertical direction than the box portion 22 that houses the battery pack 20, the frame portion 24 that supports the box portion 22, and the upper end 24 b of the frame portion 24. The front fastening part 26 and the lateral fastening part 28 are provided. Accordingly, in the present embodiment, the load F1 (see FIG. 11) transmitted from the front fastening portion 26 to the battery pack mounting frame 16 at the rear of the vehicle acts on a portion near the center of the cross section of the frame portion 24, thereby causing the lateral fastening portion. 28 can be efficiently transmitted to the vehicle, and the minimum ground height can be secured.

  Furthermore, in the present embodiment, the front side frame support portion 44 includes a subframe rear mount portion 34 provided with the front fastening portion 26. Thus, in the present embodiment, the load transmitted from the front side frame 42 is transmitted as the load F2 from the front fastening portion 26 to the side sill 18 on one side in the vehicle width direction, and is supported via the subframe rear mount portion 34. Through the sub-frame 46, the load transmitted from the front side frame 42 can be transmitted to the side sill 18 on the other side in the vehicle width direction as the load F3 (see FIG. 15). As a result, in the present embodiment, the load transmitted from the front side frame 42 can be distributed and transmitted as the load F2 and the load F3 to the pair of side sills 18 on both sides in the vehicle width direction.

  Furthermore, in the present embodiment, the battery pack mounting frame 16 includes at least a battery support frame 38 extending in the vehicle front-rear direction on the inner wall bottom surface of the box portion 22 and a battery side cross member 40 extending in the vehicle width direction. (See FIG. 5). Thereby, in this embodiment, the rigidity and intensity | strength of the battery pack mounting frame 16 can be improved, and the dispersibility of the front collision load (front collision load) with respect to a pair of side sill 18 can be improved.

  Furthermore, in this embodiment, the front side frame support portion 44 is inclined toward the vehicle width direction outward from the front wall 56b toward the side sill inner 18a from the front wall 56b that curves along the shape of the lower rear portion of the wheel house 54. The load transmission part 60 to perform is provided (refer FIG. 10). Accordingly, in the present embodiment, the front collision load input from the front side frame 42 is smoothly and efficiently transmitted from the front wall 56b of the front side frame support portion 44 to the side sill 18 via the load transmission portion 60. can do.

  Furthermore, in this embodiment, the front side frame support portion 44 includes an inner wall 56c that is flat along the vehicle front-rear direction, and a subframe rear mount portion 34 that fastens the rear end of the subframe 46 to the inner wall 56c. The front wall 56b and the inner wall 56c are connected (suspended), and are provided with a partition wall (first partition wall) and 74 disposed toward the subframe rear fastening portion 70 of the subframe rear mount portion 34 (FIG. 10). reference). In other words, the subframe rear fastening portion 70 is disposed on a substantially extended line of the axis of the partition wall 74. Thereby, in this embodiment, the support rigidity of the front suspension mechanism (not shown) supported by the subframe 46 can be increased.

  Furthermore, in the front side frame support portion 44a according to the modification shown in FIG. 16, a partition wall (second partition wall) that connects the front wall 56b and the rear wall 56d of the front side frame support portion 44a (support portion main body 56). 76, and a partition wall (second partition wall) 78 that connects the inner wall 56c and the rear wall 56d. Thereby, the load transmitted from the front side frame 42 can be transmitted to the battery pack mounting frame 16 side via the front fastening portion 26 and the partition walls 76 and 78.

DESCRIPTION OF SYMBOLS 10 Electric vehicle 14 Battery side right angle part 16 Battery pack mounting frame 18 Side sill 18a Side sill inner 20 Battery pack 22 Box part 24 Frame part 24b (Upper part of frame part) 26 Front fastening part 28 Lateral fastening part 30 Fastened member 31 Floor panel 38 Battery support frame 40 Battery side cross member 42 Front side frame 44, 44a Front side frame support part 46 Sub frame 54 Wheel house 58 Vehicle body side right angle part 56b Front wall 56c Inner side wall 56d Rear wall 56g Flat surface 60 Load transmitting part 74, 76 , 78 Bulkhead F1, F2, F3 Load

Claims (7)

A battery pack mounting frame having at least one or more battery side right-angled portions in a front portion on the vehicle front side in plan view;
A pair of front side frames arranged on the front side of the vehicle and arranged side by side along the longitudinal direction of the vehicle;
A pair of side sills arranged on both sides along the vehicle width direction of the battery pack mounting frame;
A front side frame support part for supporting the rear ends of the pair of front side frames at the front part of the floor,
With
The front side frame support is
Corresponding to the battery side right angle part, the vehicle body side right angle part provided between the front side frame support part and the side sill,
A front fastening part for joining the front side frame support part and the battery pack mounting frame;
A lateral fastening portion that couples the side sill and the battery pack mounting frame via the vehicle body side right angle portion;
An electric vehicle floor structure characterized by comprising: In the floor structure of the electric vehicle according to claim 1,
The battery pack mounting frame is
A box for storing the battery pack;
A frame portion that supports the box portion;
A fastened member having the front fastening portion and the lateral fastening portion;
With
The electric vehicle floor structure, wherein the front fastening portion and the lateral fastening portion are provided at a position lower than an upper end of the frame portion. In the floor structure of the electric vehicle according to claim 1 or 2,
The floor structure of an electric vehicle, wherein the front side frame support portion includes a subframe rear mount portion provided with the front fastening portion. In the floor structure of the electric vehicle according to claim 2 or claim 3,
2. The electric vehicle floor structure according to claim 1, wherein the battery pack mounting frame has at least a battery support frame extending in the vehicle front-rear direction on the inner wall bottom surface of the box portion and a battery side cross member extending in the vehicle width direction. In the floor structure of the electric vehicle according to any one of claims 1 to 4,
The front side frame support part has a front wall that curves along the shape of the rear lower part of the wheel house, and a load transmission part that inclines outward from the front wall toward the side sill inner in the vehicle width direction. Electric vehicle floor structure. In the floor structure of the electric vehicle according to claim 5,
A subframe is disposed on the lower side of the front side frame,
The front side frame support is
An inner wall extending on a flat surface along the longitudinal direction of the vehicle,
A sub-frame rear mount that is coupled to the inner wall and supports a rear end of the sub-frame in the vehicle front-rear direction;
A first partition connecting the front wall and the inner wall;
Have
The sub-frame rear mounting portion has a sub-frame rear fastening portion that fastens a rear end of the sub-frame,
The electric vehicle floor structure according to claim 1, wherein the first partition wall is disposed along a vehicle width direction toward the rear mounting portion of the subframe. The floor structure of the electric vehicle according to claim 6,
The front side frame support portion includes the front wall, the inner wall, and a rear wall that faces the front wall and is arranged behind the front wall of the vehicle,
Between the front wall and the inner wall, a front side frame fastening portion for fastening a rear end of the front side frame to the front side frame support portion is provided,
Furthermore, the floor structure of the electric vehicle characterized by providing the 2nd partition which connects the said front wall and the said back wall, and / or connects the said inner wall and the said back wall.

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