JP2025007724A - Vehicle interior structure - Google Patents

Abstract

To provide a cabin structure capable of both ensuring battery capacity and improving vehicle body rigidity.SOLUTION: A cabin structure comprises a front floor panel 5 of an electric vehicle 1 and a pair of right and left rear seats S2 arranged on the front floor panel 5 with a predetermined distance therebetween in a vehicle width direction. The cabin structure also has a rigid battery housing 33 which stores and holds a first battery 31 arranged behind the rear seats S2 and a second battery 32 arranged between the rear seats S2. The battery housing 33 is integrally formed in an almost T-shape in a plan view consisting of a housing rear section 34 which stores and holds the first battery 31 and a housing front section 35 which stores and holds the second battery 32. The housing rear section 34 of the battery housing 33 is fixed to a pair of right and left highly rigid vehicle body sections positioned behind the rear seats S2. The housing front section 35 of the battery housing 33 is fixed to a highly rigid vehicle body section positioned in front of seatbacks of the rear seats S2.SELECTED DRAWING: Figure 2

Description

This invention relates to a vehicle interior structure in which multiple batteries that supply power to a rotating electric machine are arranged inside the vehicle interior, for example in an electric vehicle.

Recently, there has been an increase in electric vehicles that use the output of rotating electric machines as a driving force instead of internal combustion engines that use gasoline or other fuels. For such electric vehicles, there is a need to ensure the capacity of the battery that supplies power to the rotating electric machine, thereby improving the product value by extending the driving range.

Furthermore, some electric vehicles, such as plug-in hybrids, use a body grade that is driven by the output of an internal combustion engine. In these cases, because the body is not specifically designed for electric vehicles, there is a problem that the space to mount the batteries together is limited, making it difficult to ensure the desired battery capacity.

Therefore, in the electric vehicle as described above, it has been considered to ensure battery capacity by distributing a plurality of batteries.
For example, in Patent Document 1, batteries are distributed in the passenger compartment of a vehicle between the front seats and under the rear seats to ensure sufficient battery capacity.

When trying to improve the running stability and ride comfort of a vehicle, it is possible to add reinforcing members to the body to increase the body rigidity. However, for example, in the case of an electric vehicle that uses the body with other grades of vehicles that have different drive sources, it may not be easy to add reinforcing members because the body is shared.

Furthermore, even if a reinforcing member could be provided, the reinforcing member would limit the space available for distributing the batteries, making it difficult to ensure the desired battery capacity.

JP 2015-107727 A

In view of the above problems, the present invention aims to provide a vehicle interior structure that can ensure both battery capacity and improved vehicle body rigidity.

This invention relates to a vehicle interior structure that includes a front floor panel that forms the passenger compartment floor of a vehicle, and a pair of left and right seats that are arranged on the front floor panel at a predetermined interval in the vehicle width direction and are located at the rearmost part of the vehicle, and a highly rigid battery housing that houses and holds a first battery that is arranged behind the seats and a second battery that is arranged between the seats. The battery housing extends in the vehicle width direction from the outer side of one of the seats to the outer side of the other seat in the vehicle width direction, and is integrally formed in a roughly T-shape in plan view with a rear housing part that houses and holds the first battery and a front housing part that extends from the rear housing part through the seats toward the front of the vehicle and houses and holds the second battery. The rear housing part of the battery housing is fixed to a pair of left and right highly rigid parts of the vehicle body that are located behind the seats, and the front housing part of the battery housing is fixed to a highly rigid part of the vehicle body that is located forward of the seat backs of the seats.

The pair of left and right seats located at the rearmost part of the vehicle refers to the driver's seat and passenger seat in a two-seater vehicle, or the left and right rear seats in a four-seater vehicle.
"Location behind the seat" as mentioned above means location behind the seat in the passenger compartment, or location in the luggage compartment located behind the passenger compartment, or location at the boundary between the passenger compartment and the luggage compartment located behind the seat.

The high-rigidity area to which the rear of the housing is fixed and the high-rigidity area to which the front of the housing is fixed refer to areas that are more rigid than the surrounding areas, such as closed cross-section areas that extend in the vehicle width direction or the vehicle front-rear direction, or areas where multiple panel members are overlapped. More preferably, they refer to areas that are load transmission paths that transmit collision loads, or vehicle body frame members, etc.

According to this invention, the battery capacity of the vehicle can be ensured by the first battery and the second battery arranged in the passenger compartment.
At this time, since the first battery and the second battery are housed and held in a highly rigid battery housing, the vehicle interior structure can protect the first battery and the second battery from unintended external forces.

In addition, because the rear of the battery housing is fixed to a highly rigid part of the vehicle body located rearward of the seats, the vehicle interior structure can connect the part of the vehicle body close to the load input point where the input load from the rear wheels is applied in the vehicle width direction by the rear of the housing.

In addition, since the rear part of the housing is fixed via the front part of the housing to a high-rigidity portion of the vehicle body that is located further forward of the seat back of the seat, the vehicle interior structure can prevent bending or twisting of the rear part of the housing due to input load from the rear wheels.
As a result, the vehicle interior structure can make the battery housing function as a frame member that reinforces the vehicle body, thereby improving the bending rigidity and torsional rigidity of the vehicle body.

In addition, the vehicle interior structure can suppress an increase in weight compared to a case in which a connecting member separate from the battery housing is used to connect a portion close to the load input point in the vehicle width direction.
Therefore, the vehicle interior structure can ensure battery capacity and improve vehicle body rigidity while minimizing an increase in vehicle weight.

As an aspect of this invention, the vehicle may include a rear floor panel that forms the floor surface of the luggage compartment of the vehicle behind the front floor panel, the first battery is disposed on the rear floor panel, and the rear part of the battery housing may be fixed to the high rigidity portion adjacent to the rear floor panel in the vehicle width direction.

According to this configuration, for example in a vehicle interior where the passenger compartment and the luggage compartment are integrally formed, the rear portion of the battery housing can be fixed closer to the left and right load input points.
As a result, the vehicle interior structure can reliably enable the battery casing to function as a frame member that reinforces the vehicle body, thereby further improving the rigidity of the vehicle body.

In another aspect of the invention, a pair of left and right rear side frames may be provided to which the ends of the rear floor panel in the vehicle width direction are joined, and the rear part of the battery housing may have its ends in the vehicle width direction fixed to the left and right rear side frames.

According to this configuration, the rear part of the battery housing is fixed to the rear side frame, which is an existing high-rigidity part, so that it is not necessary to provide a separate high-rigidity part in the luggage compartment.
Furthermore, since the rear side frames, which are likely to be subjected to input loads from the rear wheels, can be connected in the vehicle width direction by the rear of the housing, the vehicle interior structure can more reliably prevent twisting of the vehicle body caused by input loads from the rear wheels by the battery housing.

In another aspect of the invention, a damper support part may be provided adjacent to the outer side of the rear floor panel in the vehicle width direction and supporting the upper end of the rear suspension damper, and the rear part of the battery housing may have an end in the vehicle width direction fixed to the damper support part.

According to this configuration, since the rear part of the battery housing is fixed to the damper support part, which is an existing high-rigidity part, it is not necessary to provide a separate high-rigidity part in the luggage compartment.
Furthermore, since the damper support section, which is directly subjected to the input load from the rear wheels, can be connected in the vehicle width direction by the rear part of the housing, the vehicle interior structure can more reliably suppress twisting of the vehicle body caused by the input load from the rear wheels by the battery housing.

In another embodiment of the invention, the pair of left and right seats may be rear seats arranged at the rear of the front floor panel, and the front part of the battery housing may be formed with a length in the vehicle front-rear direction that passes between the rear seats and separates the foot spaces of the rear seats in the vehicle width direction.

This configuration makes effective use of the space between the rear seats to ensure sufficient battery capacity, and separates the left and right rear seats by the front of the housing to form independent seating spaces.

Furthermore, for example, by covering the front of the housing with a center console, the vehicle interior structure can prevent the front of the battery housing from marring the appearance between the left and right seats, while improving the livability and luxury of the rear of the passenger compartment.

As a further aspect of the present invention, the housing front portion of the battery housing may be fixed to a seat mounting portion for mounting a seat.
The seat mounting portion is a portion for mounting the legs of a seat or a seat rail, such as a portion for mounting the driver's seat and passenger seat in a two-seater vehicle, or a portion for mounting the front or rear seat in a four-seater vehicle.

With this configuration, the front part of the battery housing is fixed to the seat attachment part, which is an existing high-rigidity part, making it unnecessary to provide a separate high-rigidity part in the passenger compartment. This makes it possible for the vehicle interior structure to improve the rigidity of the vehicle body while suppressing weight increase.

In another aspect of the invention, the vehicle may include a pair of left and right side sills that extend in the fore-and-aft direction of the vehicle and to which the ends of the front floor panel in the vehicle width direction are joined, and a floor cross member that connects the side sills in the vehicle width direction and forms a closed cross section extending in the vehicle width direction together with the front floor panel, and the front part of the battery housing may be fixed to the closed cross section formed by the front floor panel and the floor cross member.

With this configuration, the front part of the battery housing is fixed to the closed cross-section part, which is an existing high-rigidity part, making it unnecessary to provide a separate high-rigidity part in the passenger compartment. This makes it possible for the vehicle interior structure to improve the rigidity of the vehicle body while suppressing weight increase.

In another aspect of the invention, the front floor panel may include a tunnel section that protrudes above the vehicle and extends in the fore-and-aft direction of the vehicle at approximately the center in the vehicle width direction, and the front section of the battery housing may be disposed above the vehicle above the tunnel section and fixed to the high-rigidity portion provided in the tunnel section.

The high-rigidity portion provided in the tunnel section refers to a closed cross-section formed by the tunnel section and a reinforcing member that reinforces the tunnel section, or a bracket that is provided to secure the front of the housing and forms a closed cross-section with the tunnel section.

With this configuration, even if the front floor panel is equipped with a tunnel section, the front part of the battery housing can be reliably supported, thereby reliably improving the rigidity of the vehicle body.

In another embodiment of the invention, the vehicle may include a dash panel extending from the front end of the front floor panel toward the top of the vehicle and separating the interior and exterior of the vehicle, and a dash cross member that, together with the dash panel, forms a closed cross section extending in the vehicle width direction, and the front of the battery housing may be fixed to the closed cross section formed by the dash panel and the dash cross member.

According to this configuration, since the front part of the battery housing is fixed to the closed cross-section part, which is an existing high rigidity part, it is unnecessary to provide a separate high rigidity part in the passenger compartment.
Furthermore, since the closed cross-section formed by the dash cross member is connected to the rear of the housing via the front of the housing, the vehicle interior structure can distribute and transmit collision loads from the front of the vehicle to the rear of the vehicle via the battery housing.
As a result, the vehicle interior structure can improve the vehicle body rigidity not only against input loads from the rear wheels, but also against collision loads from the front of the vehicle.

The present invention provides a vehicle interior structure that can ensure battery capacity while improving vehicle body rigidity.

FIG. 2 is an external perspective view showing the exterior of a vehicle compartment of the electric vehicle as viewed from the rear of the vehicle. FIG. 2 is a plan view showing the exterior of a vehicle compartment of the electric vehicle. 3 is a cross-sectional view taken along the line AA in FIG. 2 . 3 is a cross-sectional view taken along the line BB in FIG. 2 . 3 is a cross-sectional view taken along the line CC in FIG. 2 . 3 is a cross-sectional view taken along the line D-D in FIG. 2 . FIG. 11 is an external perspective view showing the external appearance of a vehicle compartment in an electric vehicle according to a second embodiment. 2 is a cross-sectional view showing a cross section of the dash fixing part taken along the line AA. FIG. FIG. 11 is an explanatory diagram illustrating a fixing structure of a front portion of a housing in another embodiment. FIG. 11 is an explanatory diagram illustrating a fixing structure of a front portion of a housing in another embodiment.

One embodiment of the invention is described below with reference to the drawings.

The vehicle of the first embodiment is an electric vehicle that uses the output of a rotating electric machine as a driving force, and a part of the battery that supplies power to the rotating electric machine is disposed inside the vehicle compartment R. The vehicle compartment structure of such an electric vehicle 1 will be described with reference to Figures 1 to 6.

Note that Figure 1 shows an external oblique view of the passenger compartment R of the electric vehicle 1 as seen from the rear of the vehicle, Figure 2 shows a plan view of the passenger compartment R of the electric vehicle 1, Figure 3 shows a cross-sectional view taken along the line A-A in Figure 2, and Figure 4 shows a cross-sectional view taken along the line B-B in Figure 2.
2. Furthermore, FIG. 5 is a cross-sectional view taken along the line CC in FIG. 2, and FIG. 6 is a cross-sectional view taken along the line DD in FIG.

In addition, in order to clarify the illustration in FIG. 1, the seat backs of the front seat S1 and rear seat S2 on the left side of the vehicle and the rear seat S2 on the right side of the vehicle are omitted. Furthermore, in order to clarify the illustration in FIG. 4 to FIG. 6, only the right side of the vehicle is shown.

In addition, in the figure, the arrows Fr and Rr indicate the front-rear direction, with the arrow Fr pointing forward and the arrow Rr pointing backward. Furthermore, the arrows Rh and Lh indicate the vehicle width direction, with the arrow Rh pointing to the right and the arrow Lh pointing to the left.

First, as shown in Figs. 1 and 2, the electric vehicle 1 of the first embodiment is a vehicle having a passenger compartment R that is made up of a passenger compartment R1 having a pair of left and right front seats S1 and a pair of left and right rear seats S2 in which passengers sit, and a luggage compartment R2 located behind the passenger compartment R1 and in which luggage and the like are carried.

As shown in Figures 1 and 2, this electric vehicle 1 includes a dash panel 2 that forms the front wall of the vehicle interior R, a pair of left and right side sills 3 that extend rearward from the lower ends of the dash panel 2 in the vehicle width direction, and a pair of left and right rear side frames 4 that are connected to the rear of the side sills 3 and extend rearward.

The electric vehicle 1 further includes a front floor panel 5 that forms the floor of the passenger compartment R1 between the side sills 3, a rear floor panel 6 that forms the floor of the luggage compartment R2 between the rear side frames 4, and a pair of left and right floor frame uppers 7 that extend in the fore-and-aft direction of the vehicle from the dash panel 2 to the front floor panel 5.

In addition, as shown in Figures 2 and 3, the electric vehicle 1 is equipped with a pair of left and right first floor cross members 8 that connect the left and right side sills 3 in the vehicle width direction, a pair of left and right second floor cross members 9 and a third floor cross member 10, and a fourth floor cross member 11 that connects the left and right rear side frames 4 in the vehicle width direction.

Next, each of the components of the electric vehicle 1 described above will be described in further detail.
As shown in FIG. 1, the dash panel 2 is a panel member having a thickness in the front-rear direction of the vehicle, and is formed in a shape such that a portion of the lower end thereof near the approximate center in the vehicle width direction protrudes upwardly of the vehicle.

The dash panel 2 has both ends in the vehicle width direction connected to hinge pillars (not shown) erected at the front ends of the side sills 3 .
As shown in Figs. 1 and 3, a dash cross member 12 is joined to the front surface of the dash panel 2, the dash cross member 12 extending in the vehicle width direction along the lower edge and connected to a hinge pillar (not shown).

The dash cross member 12 is a vehicle body frame member whose cross section, taken along the longitudinal direction of the vehicle, forms a closed cross section together with the dash panel 2, and has a generally hat-shaped cross section that protrudes toward the front of the vehicle.

The left and right side sills 3 are body frame members whose cross-sectional shape in a longitudinal section along the vehicle width direction is a closed cross-section, and as shown in FIG. 1, are composed of a side sill inner 3a located on the inside in the vehicle width direction, and a side sill outer (not shown) located on the outside in the vehicle width direction relative to the side sill inner 3a.

The pair of left and right rear side frames 4 are body frame members whose cross-sectional shape in a longitudinal section along the vehicle width direction is a closed cross section, and their front ends are joined to the inside of the vehicle width direction at the rear of the side sill 3.

The rear side frame 4 is composed of an upper side frame 4a (see FIG. 5) located above the vehicle, and a lower side frame 4b (see FIG. 5) located below the upper side frame 4a.

Furthermore, as shown in Figures 1 and 2, a damper support member 13 that supports the upper end of the rear suspension damper (not shown) is joined to the side frame upper 4a of the rear side frame 4 at a position rearward of the fourth floor cross member 11 (described later).

This damper support member 13 is a high-rigidity member made, for example, of aluminum die-cast, and is joined to a pair of left and right rear side panels (not shown) that form the inner walls of the luggage compartment R2, the side frame upper 4a, and the fourth floor cross member 11 described later, and is configured to function as a vehicle body framework member.
In addition, rear wheels (not shown) supported by a rear suspension damper are disposed below the damper support member 13 .

As shown in Figures 2 and 3, the front floor panel 5 is composed of a plate-shaped floor panel front portion 51 joined to the lower end of the dash panel 2, a kick-up portion 52 standing upright above the vehicle from the rear end of the floor panel front portion 51, and a floor panel rear portion 53 extending from the upper end of the kick-up portion 52 toward the rear of the vehicle.

More specifically, as shown in FIG. 2, the floor panel front portion 51 constitutes the floor surface of the passenger compartment R1 in a range in the vehicle longitudinal direction from the lower end of the dash panel 2 to the front end of the rear seat S2 in a plan view.

Furthermore, as shown in Figures 1 to 3, a tunnel section 51a is formed in the front part 51 of the floor panel, approximately in the center of the vehicle width direction, and protrudes upward from the vehicle with a length in the vehicle front-rear direction from the dash panel 2 to the kick-up section 52.

As shown in FIG. 4, the tunnel portion 51a has a generally trapezoidal cross section with its upper surface defining a short side in a longitudinal section along the vehicle width direction, and appropriate devices such as a shift lever are fixed to the upper surface.
As shown by the two-dot chain line in FIG. 3, a front seat center console 14 is disposed and fixed in the tunnel portion 51a at a position adjacent to the left and right front seats S1 in the vehicle width direction.

Furthermore, as shown in FIG. 4, a pair of left and right tunnel frames 15 extending in the vehicle longitudinal direction along the lower end of the tunnel portion 51a are joined to the underside of the floor panel front portion 51. The tunnel frames 15 are vehicle body framework members whose cross-sectional shape in a longitudinal section along the vehicle width direction forms a closed cross section together with the floor panel front portion 51, and their front ends are connected to the dash cross member 12.

As shown in FIG. 3, the kick-up portion 52 extends from the rear end of the floor panel front portion 51 toward the upper side and slightly toward the rear side of the vehicle.
As shown in FIG. 3, the floor panel rear portion 53 extends from the upper end of the kick-up portion 52 toward the rear of the vehicle, and then extends diagonally downward and rearward.

The seat surface (reference numeral omitted) of the rear seat S2 is placed and fixed to the rear portion 53 of the floor panel at a position spaced a predetermined distance in the vehicle width direction, approximately at the center of the vehicle width direction, as shown by the two-dot chain line in FIG. 2.

The rear floor panel 6 is a panel member that is recessed so that the vicinity of the approximate center in the vehicle's fore-and-aft direction and the approximate center in the vehicle's width direction is located at the lowest point of the vehicle, and as shown in FIG. 3, its front end is connected to the rear end of the front floor panel 5 via a fourth floor cross member 11, which will be described later.

As shown in Figures 1 and 2, the left and right floor frame uppers 7 are disposed within the vehicle interior R between the side sills 3 and the tunnel portion 51a of the front floor panel 5, with their rear ends positioned outward in the vehicle width direction relative to their front ends.

Specifically, as shown in FIG. 2, the floor frame upper 7 is disposed along an imaginary straight line (not shown) that connects the rear end of the front side frame 16 extending from the dash panel 2 toward the front of the vehicle and the outer side in the vehicle width direction of the first floor cross member 8 described later.

The floor frame upper 7 is joined to the dash panel 2 and the floor panel front portion 51, and is provided as a vehicle body frame member whose cross-sectional shape in a longitudinal section along the vehicle width direction forms a closed cross section together with the floor panel front portion 51.

Furthermore, although detailed illustration is omitted, the rear end of the upper floor frame 7 is joined to the front end of a lower floor frame (not shown) which is joined to the underside of the front floor panel 51, with the front floor panel 51 sandwiched between them.
The rear end of the floor frame lower is connected to the front end of the rear side frame 4, for example.

As shown in FIG. 2, the left and right first floor cross members 8 connect the left and right side sills 3 via the tunnel portion 51a of the front floor panel 5 in the vicinity of approximately the center of the floor panel front portion 51 in the vehicle longitudinal direction.

Specifically, the first floor cross member 8 is a vehicle body frame member whose cross-sectional shape in a longitudinal section along the vehicle front-rear direction forms a closed cross section together with the floor panel front portion 51, and is joined to the upper surface of the floor panel front portion 51.

Furthermore, as shown in Figures 1 and 2, the first floor cross member 8 is connected to the side sill 3 on the outer side in the vehicle width direction via the first outer mounting portion 8a, and is connected to the tunnel portion 51a on the inner side in the vehicle width direction via the first inner mounting portion 8b.

The first outer mounting portion 8a and the first inner mounting portion 8b are members to which the front portion of the seat rail of the front seat S1 is fastened and fixed at a position below the upper surface of the tunnel portion 51a.

More specifically, the first outer mounting portion 8a is formed in a generally box-like shape that is open toward the bottom of the vehicle and toward the outside in the vehicle width direction, and its longitudinal cross-sectional shape along the vehicle width direction is formed so that it forms a closed cross-section with the side sill 3 and the first floor cross member 8.

On the other hand, the first inner mounting portion 8b is formed in a generally box-like shape that is open toward the bottom of the vehicle and toward the inside in the vehicle width direction, and its longitudinal cross-sectional shape along the vehicle width direction is formed so that it forms a closed cross-section with the tunnel portion 51a and the first floor cross member 8.

As shown in FIG. 2, the left and right second floor cross members 9 connect the left and right side sills 3 via the tunnel portion 51a of the front floor panel 5 near approximately the center in the vehicle's fore-aft direction between the first floor cross member 8 and the kick-up portion 52.

Specifically, the second floor cross member 9 is a vehicle body frame member whose cross-sectional shape in a longitudinal section along the vehicle front-rear direction forms a closed cross section together with the floor panel front portion 51, and is joined to the upper surface of the floor panel front portion 51.

Furthermore, as shown in Figures 1 and 2, the second floor cross member 9 is connected to the side sill 3 on the outer side in the vehicle width direction via the second outer mounting portion 9a, and is connected to the tunnel portion 51a on the inner side in the vehicle width direction via the second inner mounting portion 9b.

The second outer mounting portion 9a and the second inner mounting portion 9b are members to which the rear portion of the seat rail of the front seat S1 is fastened and fixed at a position below the upper surface of the tunnel portion 51a.

More specifically, as shown in FIG. 4, the second outer mounting portion 9a is formed in a generally box-like shape that is open toward the bottom of the vehicle and toward the outside in the vehicle width direction, and its longitudinal cross-sectional shape along the vehicle width direction is formed so as to form a closed cross-section with the side sill 3 and the second floor cross member 9.

On the other hand, as shown in FIG. 4, the second inner mounting portion 9b is formed in a generally box-like shape that is open toward the bottom of the vehicle and toward the inside in the vehicle width direction, and its longitudinal cross-sectional shape along the vehicle width direction is formed so as to form a closed cross-section with the tunnel portion 51a and the second floor cross member 9.

As shown in Figure 4, a fastening bracket 17 having a generally crank-shaped cross section in a longitudinal section along the vehicle width direction is joined to the upper surface of this second inner mounting portion 9b, and to which the battery unit 30 described later is fastened.
As shown in FIG. 4, the fastening bracket 17 has a closed cross section formed by the tunnel portion 51a and the second inner mounting portion 9b, thereby forming a high rigidity portion in the tunnel portion 51a.

Specifically, as shown in FIG. 4, the fastening bracket 17 is integrally formed with a generally crank-shaped cross section, including a flat lower base 17a joined to the upper surface of the second inner mounting portion 9b, a flat upper base 17b joined to the upper surface of the tunnel portion 51a, and a flat connecting portion 17c facing the side of the tunnel portion 51a at a predetermined distance outward in the vehicle width direction.

Furthermore, an insertion hole (reference number omitted) for inserting a bolt 18 used to fasten the battery unit 30 (described later) is formed in the upper base 17b of the fastening bracket 17, and a weld nut 17d into which the bolt 18 screws is joined to the underside.

The third floor cross member 10 is a vehicle body frame member whose cross-sectional shape in a longitudinal section along the vehicle fore-and-aft direction forms a closed cross-section together with the front floor panel 5, and is joined to the rear end of the front floor panel 51 and the front end of the rear floor panel 53 across the kick-up portion 52, as shown in FIG. 3.

The fourth floor cross member 11 is disposed at the boundary between the floor panel rear portion 53 and the rear floor panel 6, as shown in FIG. 3. The fourth floor cross member 11 is a vehicle body frame member whose cross section in a longitudinal section along the vehicle front-rear direction is a closed cross section, and is composed of a cross member upper 11a located on the upper side of the vehicle, and a cross member lower 11b located on the lower side of the vehicle relative to the cross member upper 11a.

As shown in Figs. 1 to 3, in the electric vehicle 1 having such a vehicle body structure, a battery unit 30 that supplies power to the rotating electric machine is disposed across the passenger compartment R1 and the luggage compartment R2.
As shown in Figures 2 and 3, this battery unit 30 is composed of a first battery 31 arranged in the luggage compartment R2, a second battery 32 arranged in the passenger compartment R1, and a battery housing 33 that houses and holds these together.

In more detail, as shown in Figures 2 and 3, the first battery 31 is generally rectangular in plan view and is elongated in the vehicle width direction, and is disposed in front of the rear floor panel 6 so as to be adjacent to the seat back (reference number omitted) of the rear seat S2 on the rear side of the vehicle.

On the other hand, as shown in FIG. 2, the second battery 32 has a generally rectangular shape in a plan view that is narrower and longer in the front-to-rear direction of the vehicle than the first battery 31, and is disposed between the left and right rear seats S2.
The first battery 31 and the second battery 32 are, for example, lithium ion batteries.

As shown in Figs. 2 and 3, the battery housing 33 is a highly rigid housing made of, for example, die-cast aluminum, and is integrally formed in a roughly T-shape in plan view with a rear housing portion 34 that houses and holds the first battery 31 and a front housing portion 35 that houses and holds the second battery 32.

This battery housing 33 is composed of a plate-shaped lid (reference number omitted) that forms the top surface, and a storage section (reference number omitted) that has an opening on the upper side of the vehicle that is closed by the lid, and the lid is fastened and fixed to the storage section, and the storage section is fastened and fixed to a high-rigidity part of the vehicle body.

More specifically, as shown in FIG. 2, the rear housing portion 34 is formed in a generally box-like shape having a vehicle widthwise length from one rear side frame 4 to the other rear side frame 4, and a longitudinal length from the fourth floor cross member 11 to approximately the center of the rear floor panel 6 in the vehicle longitudinal direction.

As shown in FIG. 2, the rear housing 34 has a pair of first fixing parts 34a on the left and right for fastening to the rear side frame 4 rearward of the damper support member 13, and a pair of second fixing parts 34b on the left and right for fastening to the damper support member 13.

Specifically, as shown in Figures 2 and 5, the left and right first fixing portions 34a are flat plate-shaped protruding outward in the vehicle width direction from the side surface near the rear end of the rear portion 34 of the housing, and are fastened and fixed to two weld bolts 19 that are erected on the rear side frame 4 at a predetermined distance in the vehicle width direction.
The first fixing portion 34 a is fixed to the rear side frame 4 with a spacer 36 interposed between the inner side of the lower surface in the vehicle width direction and the upper surface of the rear side frame 4 .

On the other hand, the left and right second fixing parts 34b are flat plates that protrude outward in the vehicle width direction from the side surfaces near the front end of the rear part 34 of the housing, as shown in Figures 2 and 6, and are fastened and fixed to a single weld bolt 20 erected on the damper support member 13.

As shown in Figures 2 and 3, the front part 35 of the housing separates the foot space of the rear seat S2 in the vehicle width direction, and is formed with a length in the vehicle front-rear direction such that its front end is located inside the front seat center console 14.

Specifically, as shown in Figures 2 and 3, the front part 35 of the housing has a length in the vehicle longitudinal direction from the front end of the rear part 34 of the housing to the second floor cross member 9, and is formed in a roughly box-like shape with its upper surface located lower in the vehicle than the upper surface of the rear part 34 of the housing.

As shown by the two-dot chain line in FIG. 3, the front part 35 of the housing is disposed between the left and right rear seats S2 and is covered by the rear seat center console 21 that is continuous with the front seat center console 14 and extends toward the rear of the vehicle.

As shown in FIG. 2, the front part 35 of the housing has a closed cross-sectional portion formed by the front part 51 of the floor panel and the second floor cross member 9, and a pair of third fixing parts 35a on the left and right for fixing to the second inner mounting part 9b.

Specifically, as shown in Figs. 2 and 4, the left and right third fixing parts 35a are flat plates that protrude outward in the vehicle width direction from the side surfaces near the front end of the housing front part 35, and are fastened to the fastening brackets 17 using bolts 18.

In this way, the rear housing 34 of the battery unit 30 connects the high-rigidity areas (the left and right rear side frames 4 and the left and right damper support members 13) located at a predetermined distance in the vehicle longitudinal direction across the rear suspension damper in the vehicle width direction.

Furthermore, the front housing portion 35 of the battery unit 30 connects the rear housing portion 34 to a high-rigidity area in front of the rear seat S2 (the closed cross-sectional portion formed by the second floor cross member 9, the closed cross-sectional portion formed by the fastening bracket 17, and the second inner mounting portion 9b).

In other words, the left and right rear side frames 4 and the left and right damper support members 13 of the electric vehicle 1 are connected via the battery unit 30 to high-rigidity areas in front of the rear seat S2 (the closed cross-sectional portion formed by the second floor cross member 9, the closed cross-sectional portion formed by the fastening bracket 17, and the second inner mounting portion 9b).

As described above, the vehicle interior structure of the electric vehicle 1 in Example 1 includes a front floor panel 5 that forms the floor surface of the passenger compartment R1, and a pair of left and right rear seats S2 that are arranged on the front floor panel 5 at a predetermined distance in the vehicle width direction and are located at the very rear of the vehicle.

Furthermore, the interior structure of the electric vehicle 1 includes a highly rigid battery housing 33 that houses and holds a first battery 31 arranged behind the rear seat S2 and a second battery 32 arranged between the rear seats S2.

This battery housing 33 extends in the vehicle width direction from the outside of one rear seat S2 in the vehicle width direction to the outside of the other rear seat S2 in the vehicle width direction, and is integrally formed in a roughly T-shape in plan view with a rear housing part 34 in which the first battery 31 is housed and held, and a front housing part 35 in which the second battery 32 is housed and held, extending from the rear housing part 34 through between the rear seats S2 toward the front of the vehicle.

The rear housing portion 34 of the battery housing 33 is fixed to a pair of highly rigid portions of the vehicle body (rear side frames 4 and damper support members 13) located rearward of the rear seat S2.

Furthermore, the front part 35 of the battery housing 33 is fixed to a high-rigidity portion of the vehicle body located forward of the seat back of the rear seat S2 (the closed cross-section portion formed by the second floor cross member 9, the closed cross-section portion formed by the fastening bracket 17, and the second inner mounting portion 9b).

According to this configuration, the battery capacity of the electric vehicle 1 can be ensured by the first battery 31 and the second battery 32 arranged in the vehicle compartment R.
In this case, since the first battery 31 and the second battery 32 are housed and held in a highly rigid battery housing 33, the vehicle interior structure of the electric vehicle 1 can protect the first battery 31 and the second battery 32 from unintended external forces.

Furthermore, because the rear housing part 34 of the battery housing 33 is fixed to a high-rigidity part of the vehicle body located rearward of the rear seat S2, the interior structure of the electric vehicle 1 can connect parts of the vehicle body close to the load input point where the input load from the rear wheels is applied in the vehicle width direction by the rear housing part 34.

In addition, since the rear part 34 of the housing is fixed via the front part 35 of the housing to a high-rigidity part of the vehicle body that is located further forward of the seat back of the rear seat S2, the cabin structure of the electric vehicle 1 can prevent bending or twisting of the rear part 34 of the housing due to the input load from the rear wheels.
As a result, the vehicle interior structure of the electric vehicle 1 can have the battery housing 33 function as a frame member that reinforces the vehicle body, thereby improving the bending rigidity and torsional rigidity of the vehicle body.

In addition, the vehicle interior structure of the electric vehicle 1 can suppress an increase in weight compared to a case in which a connecting member separate from the battery housing 33 is used to connect a portion close to the load input point in the vehicle width direction.
Therefore, the vehicle interior structure of the electric vehicle 1 can ensure battery capacity and improve vehicle body rigidity while minimizing an increase in the weight of the electric vehicle 1.

The vehicle interior structure of the electric vehicle 1 also includes a rear floor panel 6 that is located rearward of the front floor panel 5 and forms the floor surface of the luggage compartment R2.
Furthermore, the first battery 31 is disposed on the rear floor panel 6 .

The rear part 34 of the battery housing 33 is fixed to a highly rigid portion (the rear side frame 4 and the damper support member 13) adjacent to the rear floor panel 6 in the vehicle width direction.

According to this configuration, for example, in a vehicle interior R in which a passenger compartment R1 and a luggage compartment R2 are integrally formed, the rear housing portion 34 of the battery housing 33 can be fixed closer to the left and right load input points.
As a result, the vehicle interior structure of the electric vehicle 1 can reliably enable the battery housing 33 to function as a frame member that reinforces the vehicle body, thereby further improving the rigidity of the vehicle body.

The vehicle interior structure of the electric vehicle 1 also includes a pair of left and right rear side frames 4 to which ends of the rear floor panel 6 in the vehicle width direction are joined.
The rear housing 34 of the battery housing 33 has its ends in the vehicle width direction fixed to the left and right rear side frames 4 .

With this configuration, the rear housing portion 34 of the battery housing 33 is fixed to the rear side frame 4, which is an existing high-rigidity portion, making it unnecessary to provide a separate high-rigidity portion in the luggage compartment R2.

Furthermore, because the rear side frame 4, which is easily subjected to the input load from the rear wheels, can be connected in the vehicle width direction by the rear housing part 34, the vehicle interior structure of the electric vehicle 1 can more reliably suppress the twisting of the vehicle body caused by the input load from the rear wheels by the battery housing 33.

The interior structure of the electric vehicle 1 is adjacent to the rear floor panel 6 on the outer side in the vehicle width direction and includes a damper support member 13 that supports the upper end of the rear suspension damper. The rear housing part 34 of the battery housing 33 has an end in the vehicle width direction fixed to the damper support member 13.

According to this configuration, the rear housing portion 34 of the battery housing 33 is fixed to the damper support member 13, which is an existing high-rigidity portion, so that it is not necessary to provide a separate high-rigidity portion in the luggage compartment R2.
Furthermore, since the damper support member 13, which is directly subjected to the input load from the rear wheels, can be connected in the vehicle width direction by the rear part of the housing 34, the cabin structure of the electric vehicle 1 can more reliably suppress twisting of the vehicle body caused by the input load from the rear wheels by the battery housing 33.

Further, the housing front portion 35 of the battery housing 33 passes between the rear seats S2 and is formed with a length in the vehicle longitudinal direction that separates the foot spaces of the rear seats S2 in the vehicle width direction.
According to this configuration, the space between the rear seats S2 can be effectively utilized to ensure battery capacity, and by separating the left and right rear seats S2 by the front portion 35 of the housing, independent seating spaces can be formed.

Furthermore, by covering the front part 35 of the housing with the rear seat center console 21, the interior structure of the electric vehicle 1 prevents the front part 35 of the battery housing 33 from detracting from the appearance between the left and right rear seats S2, and improves the livability and luxury of the rear part of the passenger compartment R1.

Further, the housing front portion 35 of the battery housing 33 is fixed to the second inner mounting portion 9b to which the front seat S1 is attached.
According to this configuration, since the housing front portion 35 of the battery housing 33 is fixed to the second inner mounting portion 9b, which is an existing high-rigidity portion, it is not necessary to provide a separate high-rigidity portion in the passenger compartment R1. Therefore, the cabin structure of the electric vehicle 1 can improve the vehicle body rigidity while suppressing an increase in weight.

The interior structure of the electric vehicle 1 also includes a pair of left and right side sills 3 that extend in the fore-and-aft direction of the vehicle and are joined to the vehicle widthwise ends of the front floor panel 5, and a second floor cross member 9 that connects the side sills 3 in the vehicle width direction and forms a closed cross section with the front floor panel 5 that extends in the vehicle width direction.

The front part 35 of the battery housing 33 is fixed to the closed cross-section formed by the front floor panel 5 and the second floor cross member 9.

With this configuration, the front housing portion 35 of the battery housing 33 is fixed to the closed cross-section portion, which is an existing high-rigidity portion, making it unnecessary to provide a separate high-rigidity portion in the passenger compartment R1. As a result, the vehicle interior structure of the electric vehicle 1 can improve the vehicle body rigidity while suppressing weight increase.

The front floor panel 5 also includes a tunnel portion 51a that protrudes upwardly of the vehicle and extends in the front-rear direction of the vehicle at approximately the center in the vehicle width direction.
The front housing portion 35 of the battery housing 33 is disposed above the vehicle in the tunnel portion 51a, and is fixed to a high-rigidity portion (a closed cross-sectional portion formed by the fastening bracket 17) provided in the tunnel portion 51a.

With this configuration, even if the front floor panel 5 is provided with a tunnel section 51a, the front housing section 35 of the battery housing 33 can be reliably supported, thereby reliably improving the rigidity of the vehicle body.

The vehicle interior structure of the electric vehicle 1 of the second embodiment differs from that of the first embodiment in the support structure of the front housing 35 of the battery housing 33. The battery housing 33 of the second embodiment will be described with reference to Figures 7 and 8.

7 is an external perspective view of the vehicle interior R in the electric vehicle 1 of the second embodiment, and FIG. 8 is a cross-sectional view of the dash fixing portion 37 taken along the line A-A.
Moreover, the same components as those in the first embodiment are given the same reference numerals and detailed description thereof will be omitted.

As shown in Figs. 7 and 8, the battery housing 33 of the second embodiment is integrally formed in a roughly T-shape in plan view with a housing rear portion 34 that houses and holds the first battery 31, a housing front portion 35 that houses and holds the second battery 32, and a dash fixing portion 37 that connects the housing front portion 35 to the dash panel 2.

Specifically, as shown in FIG. 7, the rear housing portion 34 is generally box-shaped and generally rectangular in plan view, elongated in the vehicle width direction, and includes a pair of left and right first fixing portions 34a that are fastened to the rear side frame 4, and a pair of left and right second fixing portions 34b that are fastened to the damper support member 13.

As shown in FIG. 7 , the housing front portion 35 is generally box-shaped and generally rectangular in plan view, elongated in the vehicle front-rear direction, and is provided with a pair of left and right third fixing portions 35 a that are fastened and fixed to the fastening bracket 17 .
As shown in FIGS. 7 and 8, dash fixing portion 37 extends from the lower portion of housing front portion 35 along tunnel portion 51a toward the front of the vehicle, and connects housing front portion 35 to dash panel 2.

As shown in Figures 7 and 8, the dash fixing part 37 is composed of an extension part 37a that extends from the lower part of the front part 35 of the housing along the tunnel part 51a toward the front of the vehicle, and an abutment part 37b that is provided at the front end of the extension part 37a and abuts against the back surface of the dash panel 2.

Specifically, the upper surface of the extension portion 37a is located below the upper surface of the housing front portion 35 so that the cross-sectional shape in a longitudinal section along the vehicle width direction conforms to the outer shape of the tunnel portion 51a, and the extension portion 37a is formed in a generally trapezoidal cross section that is open downward.

As shown in FIG. 8, the extension portion 37a is formed with an opening 37c for fixing the shift lever to the tunnel portion 51a.
On the other hand, as shown in FIG. 7, the abutting portion 37b is formed in a plate shape that is formed by extending the tip of the extension portion 37a toward the upper side of the vehicle and that conforms to the dash cross member 12.

The contact portion 37b has an insertion hole (reference number omitted) through which the weld bolt 22 erected on the dash panel 2 is inserted.
As shown in FIG. 8, the weld bolt 22 is provided in a closed cross-sectional portion formed by the dash panel 2 and the dash cross member 12.

In this manner, the dash fixing portion 37 of the battery unit 30 connects the housing front portion 35 to the closed cross-sectional portion formed by the dash panel 2 and the dash cross member 12 .
In other words, the electric vehicle 1 has the left and right rear side frames 4 and the left and right damper support members 13 connected to the closed cross-sectional portion formed by the dash panel 2 and the dash cross member 12 via the battery unit 30.

As described above, the interior structure of the electric vehicle 1 in Example 2 has the rear housing 34 fixed to a high-rigidity portion located rearward of the rear seat S2, and the front housing 35 fixed to a high-rigidity portion located forward of the rear seat S2, so that, like the above-mentioned Example 1, it is possible to ensure both the battery capacity and the rigidity of the vehicle body.

Furthermore, the interior structure of the electric vehicle 1 of the second embodiment includes a dash panel 2 that extends upward from the front end of the front floor panel 5 and separates the interior and exterior of the vehicle, and a dash cross member 12 that, together with the dash panel 2, forms a closed cross section that extends in the vehicle width direction.

The interior structure of the electric vehicle 1 in the second embodiment is such that the front part 35 of the battery housing 33 is fixed to the closed cross-section formed by the dash panel 2 and the dash cross member 12.

According to this configuration, since the front housing portion 35 of the battery housing 33 is fixed to the closed cross-section portion, which is an existing high rigidity portion, it is not necessary to provide a separate high rigidity portion in the passenger compartment R1.
Furthermore, since the closed cross-sectional portion formed by the dash cross member 12 is connected to the rear housing portion 34 via the front housing portion 35, the cabin structure of the electric vehicle 1 can distribute and transmit collision loads from the front of the vehicle to the rear of the vehicle via the battery housing 33.
As a result, the vehicle interior structure of the electric vehicle 1 can improve not only the vehicle body rigidity against the input load from the rear wheels, but also the vehicle body rigidity against the collision load from the front of the vehicle.

In the configuration of the present invention and the correspondence with the above-mentioned embodiment,
The vehicle of the present invention corresponds to an electric vehicle 1 of the embodiment,
Similarly,
The seat located at the rearmost part of the vehicle corresponds to the rear seat S2.
The high-rigidity portion to which the rear part of the housing is fixed corresponds to the rear side frame 4 and the damper support member 13.
The high-rigidity portion to which the front portion of the housing is fixed corresponds to the closed cross-sectional portion formed by the second floor cross member 9, the closed cross-sectional portion formed by the fastening bracket 17, and the second inner mounting portion 9b.
The damper support portion corresponds to the damper support member 13,
The seat attachment portion corresponds to the second inner attachment portion 9b,
The floor cross member corresponds to the second floor cross member 9,
The present invention is not limited to the configurations of the above-described embodiments, and many other embodiments can be obtained.

For example, in the above-mentioned first and second embodiments, the first battery 31 is placed in the luggage compartment R2, but the location is not limited to the luggage compartment R2 as long as the first battery 31 is placed behind the seat located at the rearmost position in the vehicle.
For example, the first battery 31 may be disposed behind the seats in the passenger compartment R1, or at the boundary between the passenger compartment R1 and the luggage compartment R2.

In addition, the electric vehicle 1 is a four-seater equipped with a pair of left and right front seats S1 and a pair of left and right rear seats S2, but the present invention is not limited to this and may be a two-seater electric vehicle 1 equipped with a pair of left and right seats. In this case, the rear housing 34 of the battery unit 30 may function as a partition wall separating the passenger compartment R1 and the luggage compartment R2.

In addition, the rear housing part 34 of the battery housing 33 is fastened and fixed to the rear side frame 4 and the damper support member 13, but this is not limited thereto, and the rear housing part 34 may be fastened and fixed to either the rear side frame 4 or the damper support member 13.

In addition, the first fixing portion 34a of the rear part 34 of the housing is fixed to the rear side frame 4 via the spacer 36, but this is not limited thereto, and the spacer 36 may be integrally formed as the first fixing portion.

In addition, instead of the aluminum die-cast damper support member 13, the electric vehicle may be provided with a wheel house that bulges into the luggage compartment R2 and has a rear suspension damper connected to its upper part, and a reinforcing member that forms a closed cross section with the wheel house. In this case, the rear housing part 34 of the battery housing 33 is fastened and fixed to the closed cross section formed by the reinforcing member and the wheel house.

The second outer mounting portion 9a and the second inner mounting portion 9b are joined to the second floor cross member 9, but this is not limited thereto, and the second outer mounting portion 9a and the second inner mounting portion 9b may be positioned at different positions in the vehicle fore-and-aft direction relative to the second floor cross member 9.

In addition, the second floor cross member 9 connects the side sill 3 and the tunnel portion 51a via the second outer mounting portion 9a and the second inner mounting portion 9b, but this is not limited to this, and the second floor cross member may directly connect the side sill 3 and the tunnel portion 51a.
In this case, the housing front portion 35 of the battery housing 33 is fixed to the closed cross-sectional portion formed by the floor panel front portion 51 and the second floor cross member 9 via a fastening bracket 17 .

In addition, the front floor panel 5 is provided with a tunnel portion 51a, but this is not limited thereto, and the front floor panel 5 may not have a tunnel portion 51a. In this case, the first floor cross member 8 and the second floor cross member 9 are configured to directly connect the left and right side sills 3.

In addition, the front part 35 of the battery housing 33 has a length in the fore-aft direction such that its front end is located inside the front seat center console 14, but this is not limited thereto, and it may have a length in the fore-aft direction such that its front end is located above the third floor cross member 10 of the vehicle, for example.

Furthermore, although the housing front portion 35 of the battery housing 33 is fixed to the second inner mounting portion 9b via the fastening bracket 17, the present invention is not limited to this.
For example, the housing front portion 35 may be fixed to the first inner mounting portion 8b, or the housing front portion 35 may be fastened and fixed to the closed cross-sectional portion formed by the kick-up portion 52 and the third floor cross member 10.

Alternatively, for example, as shown in FIG. 9(a), which shows an explanatory diagram illustrating the fixing structure of the front of the housing in another embodiment, the front housing 35 of the battery housing 33 may be fastened and fixed via a fastening bracket 23 to the closed cross-sectional portion formed by the front floor panel 5 and the tunnel frame 15.

Alternatively, as shown in FIG. 9(b), the front part 35 of the housing may have a pair of left and right legs 35b extending from both ends in the vehicle width direction toward the bottom of the vehicle, and the legs 35b of the front part 35 of the housing may be fastened and fixed to the closed cross-sectional portion formed by the front floor panel 5 and the tunnel frame 15.

Furthermore, as shown in FIG. 10(a), which is an explanatory diagram illustrating the fixing structure of the front part of the housing in another embodiment, the front part 35 of the battery housing 33 may be fastened and fixed to the fastening bracket 24 that is joined to the upper and side surfaces of the tunnel part 51a and forms a closed cross section with the tunnel part 51a.

Alternatively, as shown in FIG. 10(b), a tunnel reinforcement 25 may be provided to reinforce the tunnel portion 51a from below the vehicle, and the front housing portion 35 of the battery housing 33 may be fastened and fixed to the closed cross-sectional portion formed by the tunnel portion 51a and the tunnel reinforcement 25.

In this case, the fastening bracket 24 or the tunnel reinforcement 25 forms a high-rigidity portion in the tunnel portion 51a, so that the front housing portion 35 of the battery housing 33 can be reliably supported, as in the above-described embodiment.

In addition, the high-rigidity portion to which the rear housing portion 34 of the battery housing 33 is fixed and the high-rigidity portion to which the front housing portion 35 is fixed are not limited to the high-rigidity portions described above, and may be any appropriate portion that is more rigid than the surrounding areas.

For example, instead of a portion whose cross section in a longitudinal section along the vehicle width direction or the vehicle front-rear direction is a closed cross section, the portion may be a high-rigidity portion in which multiple panel members are stacked. Note that the high-rigidity portion to which the battery housing 33 is fixed is preferably a portion that serves as a load transmission path for transmitting a collision load, or a vehicle body frame member.

In addition, the battery housing 33 is configured such that the upper surface of the front housing 35 is positioned below the upper surface of the rear housing 34, but this is not limited thereto, and the battery housing 33 may be configured such that the upper surface of the rear housing 34 and the upper surface of the front housing 35 are positioned at approximately the same vertical position.

This configuration ensures the rigidity of the battery housing 33 against the input load from the rear wheels.

Specifically, the length of the battery housing 33 in the vehicle width direction at the housing front portion 35 is shorter than that at the housing rear portion 34, so there is a risk that an input load from the rear wheels will cause an unintended load to be applied near the boundary between the housing rear portion 34 and the housing front portion 35.

Therefore, by making the upper surface near the boundary between the rear portion 34 of the housing and the front portion 35 of the housing approximately flat, the vehicle interior structure can prevent deformation from occurring near the boundary between the rear portion 34 of the housing and the front portion 35 of the housing.
As a result, the vehicle interior structure can ensure the rigidity of the battery housing 33 against the input load from the rear wheels, so that the battery housing 33 can reliably function as a frame member that reinforces the vehicle body.

The configuration of the battery housing 33 is not limited to the above-described first and second embodiments, and may be, for example, a battery housing 33 equipped with a console fixing portion to which the rear seat center console 21 is fixed, or an equipment fixing portion to which an in-vehicle device is fixed.

Reference Signs List 1...electric vehicle 2...dash panel 3...side sill 4...rear side frame 5...front floor panel 6...rear floor panel 9...second floor cross member 9b...second inner mounting portion 12...dash cross member 13...damper support member 17...fastening bracket 31...first battery 32...second battery 33...battery housing 34...rear housing 35...front housing 51...front floor panel 51a...tunnel portion S2...rear seat R1...passenger compartment R2...luggage compartment

Claims (9)

A front floor panel that forms a passenger compartment floor of the vehicle;
A vehicle interior structure including a pair of left and right seats arranged on the front floor panel at a predetermined interval in a vehicle width direction and positioned at the rearmost position of the vehicle,
a highly rigid battery housing that houses and holds a first battery disposed behind the seat and a second battery disposed between the seats;
The battery housing includes:
a housing rear portion that extends in a vehicle width direction from an outer side of one of the seats in the vehicle width direction to an outer side of the other of the seats in the vehicle width direction and that houses and holds the first battery;
the battery compartment extends from the rear portion of the housing toward the front of the vehicle through the space between the seats, and is integrally formed with a front portion of the housing in which the second battery is housed and held, so as to have a generally T-shape in a plan view;
The rear portion of the battery housing is
The seat is fixed to a pair of highly rigid portions of the vehicle body located rearward of the vehicle seat,
The housing front portion of the battery housing is
A vehicle interior structure fixed to a high rigidity portion of the vehicle body located forward of the seat back of the seat. a rear floor panel that is located behind the front floor panel and forms a luggage compartment floor of the vehicle;
the first battery is disposed on the rear floor panel,
The rear portion of the battery housing is
2. The vehicle interior structure according to claim 1, wherein the rear floor panel is fixed to the high rigidity portion adjacent to the rear floor panel in the vehicle width direction. a pair of left and right rear side frames to which ends of the rear floor panel in a vehicle width direction are joined,
The rear portion of the battery housing is
3. The vehicle interior structure according to claim 2, wherein ends in the vehicle width direction are fixed to the left and right rear side frames. a damper support portion adjacent to the outer side of the rear floor panel in the vehicle width direction and supporting an upper end of a rear suspension damper,
The rear portion of the battery housing is
3. The vehicle interior structure according to claim 2, wherein an end portion in a vehicle width direction is fixed to the damper support portion. The pair of left and right seats are
a rear seat disposed behind the front floor panel;
The housing front portion of the battery housing is
2. The vehicle interior structure according to claim 1, wherein the vehicle front-rear direction length is such that the rear seat space is separated from the rear seat space in the vehicle width direction. The housing front portion of the battery housing is
2. The vehicle interior structure according to claim 1, wherein the vehicle interior structure is fixed to a seat mounting portion for mounting a seat. a pair of left and right side sills extending in a vehicle front-rear direction and to which ends of the front floor panel in a vehicle width direction are joined;
a floor cross member that connects the side sills in a vehicle width direction and forms a closed cross section extending in the vehicle width direction together with the front floor panel,
The housing front portion of the battery housing is
2. The vehicle interior structure according to claim 1, wherein the front floor panel and the floor cross member are fixed to a closed cross-sectional portion. The front floor panel is
A tunnel portion protruding upward from the vehicle and extending in the vehicle front-rear direction at approximately the center in the vehicle width direction,
The housing front portion of the battery housing is
2. The vehicle interior structure according to claim 1, wherein the tunnel portion is disposed above the vehicle and fixed to the high rigidity portion provided in the tunnel portion. a dash panel extending from a front end of the front floor panel toward the upper part of the vehicle and separating the interior and exterior of the vehicle;
a dash cross member that, together with the dash panel, defines a closed cross section extending in a vehicle width direction;
The housing front portion of the battery housing is
2. The vehicle interior structure according to claim 1, wherein the dash panel and the dash cross member are fixed to a closed cross-sectional portion.

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