Cabin structure

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

[Technical field]

[0001] The present invention relates to a vehicle compartment structure in which a plurality of batteries for supplying electric power to a rotating electric machine are arranged in the vehicle compartment, for example in an electric vehicle. [Background technology]

[0002] 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 as fuel, etc. In such electric vehicles, there is a need to ensure the capacity of the battery that supplies power to the rotating electric machine and to improve the product value by extending the driving range.

[0003] Furthermore, some electric vehicles, such as plug-in hybrids, use a body grade that uses the output of an internal combustion engine as a driving force. In this case, since the body is not dedicated to electric vehicles, there is a problem that the space for mounting the batteries together is limited, making it difficult to secure the desired battery capacity.

[0004] 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 between the front seats and under the rear seats within the vehicle cabin to ensure sufficient battery capacity.

[0005] When improving the running stability and ride comfort of a vehicle, it is possible to consider increasing the rigidity of the vehicle body by adding reinforcing members to the vehicle body. However, in the case of electric vehicles that use the vehicle body with other grades of vehicles that have different drive sources, for example, it may not be easy to add reinforcing members because the vehicle body is shared.

[0006] Furthermore, even if a reinforcing member could be provided, the reinforcing member would limit the space available for distributing the batteries, and there was a risk that the desired battery capacity could not be secured. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2015-107727 A Summary of the Invention [Problem to be solved by the invention]

[0008] In view of the above-mentioned problems, an object of the present invention is to provide a vehicle interior structure that can ensure both battery capacity and improved vehicle body rigidity. [Means for solving the problem]

[0009] The present invention relates to a vehicle interior structure comprising a front floor panel forming the passenger compartment floor of a vehicle, and a pair of left and right seats arranged on the front floor panel at a predetermined distance in the vehicle width direction and located at the rearmost part of the vehicle, the vehicle interior structure further comprising a highly rigid battery housing which houses and holds a first battery arranged rearward of the seats and a second battery arranged between the seats, the battery housing extending in the vehicle width direction from the outer side of one of the seats to the outer side of the other of the seats, and being integrally formed in a roughly T-shape in a plan view with a rear housing part which houses and holds the first battery and a front housing part which 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 being fixed to a pair of left and right highly rigid parts of the vehicle body located rearward of the seats, and the front housing part of the battery housing being fixed to a highly rigid part of the vehicle body located forward of the seat backs of the seats.

[0010] 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.

[0011] The high-rigidity portion to which the rear part of the housing is fixed and the high-rigidity portion to which the front part of the housing is fixed refer to portions having higher rigidity than the surroundings, such as a closed cross-sectional portion extending in the vehicle width direction or the vehicle front-rear direction, or a portion where a plurality of panel members are overlapped, etc. More preferably, they refer to a portion that becomes a load transmission path for transmitting a collision load, or a vehicle body frame member, etc.

[0012] 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.

[0013] Furthermore, since the rear of the battery housing is fixed to a high-rigidity part of the body located rearward of the seats, the vehicle interior structure can connect the part of the 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.

[0014] 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.

[0015] 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.

[0016] As an aspect of the invention, the vehicle may include a rear floor panel that forms a luggage compartment floor surface of the vehicle rear of the front floor panel, the first battery is arranged on the rear floor panel, and the rear portion of the battery housing may be fixed to the high rigidity portion adjacent to the rear floor panel in the vehicle width direction.

[0017] 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.

[0018] In another aspect of the present invention, the vehicle may further include a pair of left and right rear side frames to which the vehicle width direction ends of the rear floor panel are joined, and the rear of the battery housing has its vehicle width direction ends fixed to the left and right rear side frames.

[0019] 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.

[0020] In another aspect of the present invention, the battery housing may be provided with 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, and the rear portion of the battery housing may have an end portion in the vehicle width direction fixed to the damper support portion.

[0021] 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.

[0022] In another aspect of the invention, the pair of left and right seats may be formed of rear seats located at the rear of the front floor panel, and the front part of the battery housing may be formed with a length in the fore-and-aft direction of the vehicle that passes between the rear seats and separates the foot spaces of the rear seats in the vehicle width direction.

[0023] According to this configuration, the space between the rear seats can be effectively utilized to ensure battery capacity, and the left and right rear seats can be separated by the front part of the housing to form independent seating spaces.

[0024] Furthermore, for example, by covering the front part of the housing with a center console, the vehicle interior structure can prevent the front part of the battery housing from detracting from the appearance between the left and right seats, while improving the livability and luxury of the rear part of the passenger compartment.

[0025] 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 the portion where the seat legs or seat rails are attached, such as the portion where the driver's seat and passenger seat are attached in a two-seater vehicle, or the portion where the front or rear seats are attached in a four-seater vehicle.

[0026] With this configuration, the front part of the battery housing is fixed to the seat mounting part, which is an existing high-rigidity part, so there is no need to provide a separate high-rigidity part in the passenger compartment. This makes it possible to improve the vehicle body rigidity while suppressing weight increase in the vehicle interior structure.

[0027] Another aspect of the invention may include a pair of left and right side sills extending in the fore-and-aft direction of the vehicle and to which the vehicle width directional ends of the front floor panel are joined, and a floor cross member connecting the side sills in the vehicle width direction and forming a closed cross section extending in the vehicle width direction together with the front floor panel, and the front of the battery housing may be fixed to the closed cross section formed by the front floor panel and the floor cross member.

[0028] 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, so there is no need to provide a separate high-rigidity part in the passenger compartment. Therefore, the vehicle interior structure can improve the vehicle body rigidity while suppressing weight increase.

[0029] In another aspect of the invention, the front floor panel protrudes upwardly from the vehicle and has a tunnel section extending in the fore-and-aft direction of the vehicle at approximately the center of the vehicle width, and the front portion of the battery housing is positioned above the vehicle above the tunnel section and fixed to the high rigidity portion provided in the tunnel section.

[0030] The high-rigidity portion provided in the tunnel portion refers to a closed cross-section formed by the tunnel portion and a reinforcing member that reinforces the tunnel portion, or a bracket that is provided to fix the front part of the housing and forms a closed cross-section with the tunnel portion.

[0031] According to this configuration, even if the front floor panel is provided with a tunnel portion, the front portion of the battery housing can be reliably supported, thereby reliably improving the rigidity of the vehicle body.

[0032] Another aspect of the invention may include a dash panel extending upward from the front end of the front floor panel and separating the interior and exterior of the vehicle, and a dash cross member forming a closed cross section extending in the vehicle width direction together with the dash panel, 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.

[0033] 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. Effect of the Invention

[0034] According to the present invention, it is possible to provide a vehicle interior structure that can ensure battery capacity while improving vehicle body rigidity. [Brief description of the drawings]

[0035] [Figure 1] 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. [Diagram 2] FIG. 2 is a plan view showing the exterior of a vehicle compartment of the electric vehicle. [Diagram 3] A cross-sectional view taken along the line AA in FIG. [Figure 4] BB arrow cross-sectional view in FIG. 2. [Diagram 5] A cross-sectional view taken along the line CC in FIG. [Figure 6] Cross-sectional view taken along the line DD in FIG. 2. [Figure 7] FIG. 11 is an external perspective view showing the external appearance of a vehicle compartment in an electric vehicle according to a second embodiment. [Figure 8] 2 is a cross-sectional view showing a cross section of the dash fixing part taken along line AA. FIG. [Figure 9] FIG. 11 is an explanatory diagram illustrating a fixing structure of a front portion of a housing in another embodiment. [Figure 10] FIG. 11 is an explanatory diagram illustrating a fixing structure of a front portion of a housing in another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] An embodiment of the present invention will now be described with reference to the drawings. EXAMPLES

[0037] 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 battery that supplies power to the rotating electric machine is partially disposed inside the vehicle compartment R. The vehicle compartment structure of such an electric vehicle 1 will be described with reference to Figs. 1 to 6.

[0038] 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 AA in Figure 2, and Figure 4 shows a cross-sectional view taken along the line BB in Figure 2. 5 is a cross-sectional view taken along line CC in FIG. 2, and FIG. 6 is a cross-sectional view taken along line DD in FIG.

[0039] In addition, in order to clarify the illustration in Fig. 1, the seat backs of the front seat S1 and the 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 illustrated.

[0040] In the drawings, the arrows Fr and Rr indicate the front-rear direction, with the arrow Fr indicating the front and the arrow Rr indicating the rear, and the arrows Rh and Lh indicate the vehicle width direction, with the arrow Rh indicating the right direction and the arrow Lh indicating the left direction.

[0041] First, as shown in Figs. 1 and 2, the electric vehicle 1 of the first embodiment is a vehicle having a passenger compartment R which is configured with a passenger compartment R1 having a pair of left and right front seats S1 and a pair of left and right rear seats S2 for seating passengers, and a luggage compartment R2 for carrying luggage and the like, located behind the passenger compartment R1.

[0042] As shown in Figures 1 and 2, this electric vehicle 1 includes a dash panel 2 that forms the front wall of the passenger compartment 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 of the vehicle.

[0043] Furthermore, the electric vehicle 1 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.

[0044] 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.

[0045] Next, each of the components of the electric vehicle 1 described above will be described in further detail. As shown in FIG. 1, 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 its lower end near the approximate center in the vehicle width direction protrudes upwardly of the vehicle.

[0046] Both ends of the dash panel 2 in the vehicle width direction are 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).

[0047] The dash cross member 12 is a vehicle body frame member whose cross section in a longitudinal section along the vehicle front-rear direction forms a closed cross section together with the dash panel 2, and is formed into a generally hat-shaped cross section that protrudes toward the front of the vehicle.

[0048] 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.

[0049] The pair of left and right rear side frames 4 are vehicle body framework 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 in the vehicle width direction at the rear of the side sills 3.

[0050] The rear side frame 4 is made up 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 vehicle with respect to the upper side frame 4a.

[0051] 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 vehicle relative to the fourth floor cross member 11 described later.

[0052] 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 of the vehicle.

[0053] 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 upward 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.

[0054] More specifically, as shown in FIG. 2, floor panel front portion 51 constitutes the floor surface of passenger compartment R1 in a range in the vehicle front-rear direction from the lower end of dash panel 2 to the front end of rear seat S2 in a plan view.

[0055] Furthermore, as shown in Figures 1 to 3, a tunnel portion 51a is formed in the front portion 51 of the floor panel, approximately in the center of the vehicle width direction, which protrudes upward from the dash panel 2 to the kick-up portion 52 in the fore-and-aft direction of the vehicle.

[0056] As shown in FIG. 4, this tunnel portion 51a has a generally trapezoidal cross section with the upper surface forming the short side in a vertical cross 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.

[0057] 4, a pair of left and right tunnel frames 15 extending in the vehicle front-rear direction along the lower end of tunnel portion 51a are joined to the underside of floor panel front portion 51. Tunnel frame 15 is a vehicle body framework member whose cross-sectional shape in a vertical cross section along the vehicle width direction forms a closed cross section together with floor panel front portion 51, and its front end is connected to dash cross member 12.

[0058] As shown in FIG. 3, kick-up portion 52 extends from the rear end of floor panel front portion 51 toward the upper side of the vehicle and slightly toward the rear side of the vehicle. As shown in FIG. 3, floor panel rear portion 53 extends from the upper end of kick-up portion 52 toward the rear of the vehicle, and then extends diagonally downward and rearward.

[0059] As shown by the two-dot chain line in Figure 2, the seat surface portion (number omitted) of the rear seat S2 is placed and fixed to this floor panel rear portion 53 at a predetermined distance in the vehicle width direction, sandwiching the vicinity of approximately the center in the vehicle width direction.

[0060] In addition, the rear floor panel 6 is a panel member that is recessed so that the area approximately near the center in the vehicle's fore-and-aft direction and approximately near the center in the vehicle's width direction is located at the very bottom of the vehicle, and as shown in Figure 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.

[0061] In addition, as shown in Figures 1 and 2, the left and right floor frame uppers 7 are positioned within the vehicle compartment R between the side sill 3 and the tunnel portion 51a of the front floor panel 5 so that their rear ends are positioned outside the vehicle width direction relative to their front ends.

[0062] Specifically, as shown in FIG. 2, in a plan view, the floor frame upper 7 is arranged along a virtual straight line (not shown) connecting 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.

[0063] This 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 framework member whose cross-sectional shape in a vertical cross section along the vehicle width direction forms a closed cross section together with the floor panel front portion 51.

[0064] Furthermore, although detailed illustration is omitted, the rear end of the upper floor frame 7 is joined to the front end of the 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.

[0065] As shown in FIG. 2, the left and right first floor cross members 8 connect the left and right side sills 3 via a 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 front-rear direction.

[0066] Specifically, the first floor cross member 8 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 with the floor panel front portion 51, and is joined to the upper surface of the floor panel front portion 51.

[0067] 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.

[0068] The first outer mounting portion 8a and the first inner mounting portion 8b are members to which the front portions of the seat rails of the front seat S1 are fastened and fixed at positions lower in the vehicle than the upper surface of the tunnel portion 51a.

[0069] More specifically, the first outer mounting portion 8a is formed in a roughly 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 first floor cross member 8.

[0070] On the other hand, the first inner mounting portion 8b is formed in an approximately box shape with openings toward the bottom of the vehicle and on the inner side 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 first floor cross member 8.

[0071] In addition, 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, approximately in the vicinity of the center in the fore-and-aft direction of the vehicle between the first floor cross member 8 and the kick-up portion 52, as shown in Figure 2.

[0072] Specifically, the second floor cross member 9 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 with the floor panel front portion 51, and is joined to the upper surface of the floor panel front portion 51.

[0073] 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.

[0074] The second outer mounting portion 9a and the second inner mounting portion 9b are members to which rear portions of the seat rails of the front seat S1 are fastened and fixed at positions lower in the vehicle than the upper surface of the tunnel portion 51a.

[0075] More specifically, as shown in Figure 4, the second outer mounting portion 9a is formed in a roughly box 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.

[0076] On the other hand, as shown in Figure 4, the second inner mounting portion 9b is formed in a roughly 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.

[0077] A fastening bracket 17, which has a generally crank-shaped cross section in a longitudinal section along the vehicle width direction as shown in FIG. 4, 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.

[0078] Specifically, as shown in FIG. 4, the fastening bracket 17 is integrally formed with a generally crank-shaped cross section and includes 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.

[0079] Furthermore, an insertion hole (number omitted) for inserting a bolt 18 used to fix 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 is screwed is joined to the underside.

[0080] In addition, 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 with the front floor panel 5, and as shown in Figure 3, it is joined to the rear end of the floor panel front portion 51 and the front end of the floor panel rear portion 53 across the kick-up portion 52.

[0081] 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. 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 forms 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.

[0082] In the electric vehicle 1 having such a vehicle body structure, as shown in Figs. 1 to 3, 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.

[0083] In 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 (symbol omitted) of the rear seat S2 on the rear side of the vehicle.

[0084] 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-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.

[0085] As shown in Figures 2 and 3, the battery housing 33 is a highly rigid housing made, for example, of 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.

[0086] This battery housing 33 is composed of a plate-shaped lid portion (symbol omitted) forming the upper surface, and a storage portion (symbol omitted) having an opening on the upper side of the vehicle that is closed by the lid portion, with the lid portion fastened and fixed to the storage portion, and the storage portion fastened and fixed to a high-rigidity portion of the vehicle body.

[0087] More specifically, as shown in Figure 2, the rear portion 34 of the housing is formed approximately in a box shape having a vehicle width direction length from one rear side frame 4 to the other rear side frame 4, and a fore-aft direction length from the fourth floor cross member 11 to approximately the center of the rear floor panel 6 in the vehicle fore-aft direction.

[0088] As shown in Figure 2, the rear portion 34 of the housing has a pair of left and right first fixing portions 34a for fastening to the rear side frame 4 rearward of the damper support member 13, and a pair of left and right second fixing portions 34b for fastening to the damper support member 13.

[0089] 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 erected on the rear side frame 4 at a predetermined distance in the vehicle width direction. The first fixing portion 34a 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.

[0090] On the other hand, the left and right second fixing portions 34b, as shown in Figures 2 and 6, are flat plates protruding outward in the vehicle width direction from the side surfaces near the front ends of the rear housing portion 34, and are fastened and fixed to one weld bolt 20 erected on the damper support member 13.

[0091] As shown in Figures 2 and 3, the front portion 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 fore-and-aft direction such that its front end is located inside the front seat center console 14.

[0092] Specifically, as shown in Figures 2 and 3, the front portion 35 of the housing has a length in the fore-and-aft direction of the vehicle from the front end of the rear portion 34 of the housing to the second floor cross member 9, and is formed approximately in a box shape with its upper surface located lower in the vehicle than the upper surface of the rear portion 34 of the housing.

[0093] As indicated by the two-dot chain line in FIG. 3, the front portion 35 of the housing is disposed between the left and right rear seats S2 and is covered by the rear center console 21 that is continuous with the front center console 14 and extends rearward of the vehicle.

[0094] As shown in Figure 2, such a housing front portion 35 has a closed cross-sectional portion formed by the floor panel front portion 51 and the second floor cross member 9, and a pair of left and right third fixing portions 35a for fixing to the second inner mounting portion 9b.

[0095] Specifically, the left and right third fixing portions 35a are flat plates protruding outward in the vehicle width direction from the side surfaces near the front ends of the housing front portion 35, as shown in Figures 2 and 4, and are fastened to the fastening brackets 17 using bolts 18.

[0096] In this way, the rear housing 34 of the battery unit 30 connects, in the vehicle width direction, high rigidity areas (the left and right rear side frames 4 and the left and right damper support members 13) located at positions spaced a predetermined distance apart in the fore-and-aft direction of the vehicle, sandwiching the rear suspension damper.

[0097] Furthermore, the front housing 35 of the battery unit 30 connects the rear housing 34 to a high-rigidity portion of the vehicle forward 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).

[0098] 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 via the battery unit 30 to a high-rigidity portion (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) located forward of the rear seat S2 of the vehicle.

[0099] As described above, the cabin structure of the electric vehicle 1 in Example 1 includes a front floor panel 5 forming 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.

[0100] Furthermore, the vehicle 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.

[0101] 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 a plan view with a rear housing part 34 in which the first battery 31 is housed and held, and a front housing part 35 which extends from the rear housing part 34 through the rear seats S2 toward the front of the vehicle and in which the second battery 32 is housed and held.

[0102] A rear portion 34 of the battery housing 33 is fixed to a pair of highly rigid portions (rear side frames 4 and damper support members 13) of the vehicle body located rearward of the rear seat S2.

[0103] Furthermore, the front housing 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-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).

[0104] 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. At this time, 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.

[0105] Furthermore, since the rear housing part 34 of the battery housing 33 is fixed to a high-rigidity part of the body located rearward of the rear seat S2, the interior structure of the electric vehicle 1 can connect parts of the 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.

[0106] 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.

[0107] 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.

[0108] The vehicle interior structure of the electric vehicle 1 also includes a rear floor panel 6 that is located behind 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.

[0109] A rear portion 34 of the battery housing 33 is fixed to high-rigidity portions (the rear side frame 4 and the damper support member 13) adjacent to the rear floor panel 6 in the vehicle width direction.

[0110] According to this configuration, for example, in a vehicle interior R in which a passenger compartment R1 and a luggage compartment R2 are integrally provided, 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 cause the battery housing 33 to function as a frame member that reinforces the vehicle body, thereby further improving the rigidity of the vehicle body.

[0111] 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 a rear floor panel 6 in the vehicle width direction are joined. The battery housing 33 has a housing rear portion 34, the ends of which in the vehicle width direction are fixed to the left and right rear side frames 4.

[0112] According to this configuration, since 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, it is not necessary to provide a separate high rigidity portion in the luggage compartment R2.

[0113] Furthermore, since the rear side frames 4, which are likely to be subjected to input loads from the rear wheels, can be connected in the vehicle width direction by the rear housing 34, the vehicle interior structure of the electric vehicle 1 can more reliably suppress twisting of the body due to input loads from the rear wheels by the battery housing 33.

[0114] The vehicle interior structure of the electric vehicle 1 also includes a damper support member 13 that is adjacent to the outer side in the vehicle width direction of the rear floor panel 6 and 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.

[0115] According to this configuration, since 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, 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.

[0116] 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 front-rear 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.

[0117] 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 compromising 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.

[0118] 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 part 35 of the battery housing 33 is fixed to the second inner mounting part 9b, which is an existing high-rigidity part, it is not necessary to provide a separate high-rigidity part in the passenger compartment R1. Therefore, the vehicle interior structure of the electric vehicle 1 can improve the vehicle body rigidity while suppressing an increase in weight.

[0119] In addition, the interior structure of the electric vehicle 1 includes a pair of left and right side sills 3 which extend in the fore-and-aft direction of the vehicle and have their vehicle widthwise ends joined to the front floor panel 5, and a second floor cross member 9 which connects the side sills 3 in the vehicle width direction and forms a closed cross section with the front floor panel 5 extending in the vehicle width direction.

[0120] The battery housing 33 has a housing front portion 35 fixed to a closed cross-sectional portion formed by the front floor panel 5 and the second floor cross member 9.

[0121] According to this configuration, since the housing front 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. Therefore, the vehicle interior structure of the electric vehicle 1 can improve the vehicle body rigidity while suppressing an increase in weight.

[0122] Further, the front floor panel 5 is provided with 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 part 35 of the battery housing 33 is disposed above the vehicle in the tunnel part 51a, and is fixed to a high-rigidity part (a closed cross-sectional part formed by the fastening bracket 17) provided in the tunnel part 51a.

[0123] According to this configuration, even if the front floor panel 5 is provided with the tunnel portion 51a, the housing front portion 35 of the battery housing 33 can be reliably supported, so that the rigidity of the vehicle body can be reliably improved. EXAMPLES

[0124] The vehicle interior structure of the electric vehicle 1 of the second embodiment is different from that of the first embodiment in the support structure of the housing front part 35 of the battery housing 33. Such a battery housing 33 of the second embodiment will be described with reference to Figs.

[0125] 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 AA. Moreover, the same components as those in the above-described first embodiment are given the same reference numerals, and detailed description thereof will be omitted.

[0126] As shown in Figures 7 and 8, the battery housing 33 of Example 2 is integrally formed in a roughly T-shape in a plan view with a rear housing portion 34 that houses and holds the first battery 31, a front housing portion 35 that houses and holds the second battery 32, and a dash fixing portion 37 that connects the front housing portion 35 to the dash panel 2.

[0127] Specifically, as shown in FIG. 7, the rear housing 34 is approximately box-shaped and generally rectangular in plan view, elongated in the vehicle width direction, and has a pair of left and right first fixing portions 34a fastened to the rear side frame 4, and a pair of left and right second fixing portions 34b fastened to the damper support member 13.

[0128] 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 includes a pair of left and right third fixing portions 35a fastened and fixed to the fastening bracket 17. As shown in FIGS. 7 and 8, dash fixing portion 37 extends from a 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 FIG.

[0129] As shown in Figures 7 and 8, this dash fixing portion 37 is composed of an extension portion 37a that extends from the lower part of the housing front portion 35 along the tunnel portion 51a toward the front of the vehicle, and an abutment portion 37b that is provided at the front end of the extension portion 37a and abuts against the back surface of the dash panel 2.

[0130] Specifically, the extension portion 37a has an upper surface 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 is formed into an approximately trapezoidal cross-section that is open downward.

[0131] 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, the abutting portion 37b is formed in a plate shape along the dash cross member 12 by extending the tip of the extension portion 37a toward the upper side of the vehicle, as shown in FIG.

[0132] The contact portion 37b has an insertion hole (reference numeral omitted) through which the weld bolt 22 provided in 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.

[0133] In this manner, dash fixing portion 37 of battery unit 30 connects housing front portion 35 to the closed cross-sectional portion formed by dash panel 2 and 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.

[0134] As described above, the interior structure of the electric vehicle 1 in the second embodiment 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, similar to the first embodiment described above, it is possible to ensure both the battery capacity and the vehicle body rigidity.

[0135] 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 extending in the vehicle width direction.

[0136] In the vehicle interior structure of the electric vehicle 1 of the second embodiment, the housing front part 35 of the battery housing 33 is fixed to the closed cross-sectional part formed by the dash panel 2 and the dash cross member 12.

[0137] According to this configuration, since the housing front portion 35 of the battery housing 33 is fixed to the closed cross-section portion, which is an existing high rigidity portion, it is possible to eliminate the need 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.

[0138] In the configuration of the present invention and the correspondence with the above-mentioned embodiment, The vehicle of the present invention corresponds to the 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 part 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.

[0139] 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 arranged behind the seats in the passenger compartment R1, or at the boundary between the passenger compartment R1 and the luggage compartment R2.

[0140] 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.

[0141] In addition, although the rear housing portion 34 of the battery housing 33 is fastened to the rear side frame 4 and the damper support member 13, this is not limited to this, and the rear housing portion 34 may be fastened to either the rear side frame 4 or the damper support member 13.

[0142] Further, the first fixed portion 34a of the housing rear portion 34 is fixed to the rear side frame 4 via the spacer 36, but the present invention is not limited to this, and the spacer 36 may be integrally formed as the first fixed portion.

[0143] Also, instead of the aluminum die-cast damper support member 13, an electric vehicle may be provided with a wheel house that bulges into the luggage compartment R2 and has an upper part to which the rear suspension damper is connected, and a reinforcing member that forms a closed cross section together with the wheel house. In this case, the housing rear 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.

[0144] Although the second outer mounting portion 9a and the second inner mounting portion 9b are joined to the second floor cross member 9, this is not limited to this, and the second outer mounting portion 9a and the second inner mounting portion 9b may be positioned at different positions in the fore-and-aft direction of the vehicle relative to the second floor cross member 9.

[0145] 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.

[0146] In addition, the front floor panel 5 is provided with the tunnel portion 51a, but this is not limited thereto, and the front floor panel 5 may not be provided with the 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.

[0147] In addition, the front portion 35 of the battery housing 33 has a length in the fore-and-aft direction such that its front end is located inside the front seat center console 14, but this is not limited to this and may be, for example, a length in the fore-and-aft direction such that its front end is located above the third floor cross member 10 of the vehicle.

[0148] 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.

[0149] Alternatively, for example, as shown in Figure 9(a), which is 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 configured to be fastened and fixed to the closed cross-sectional portion formed by the front floor panel 5 and the tunnel frame 15 via a fastening bracket 23.

[0150] Alternatively, as shown in Figure 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.

[0151] Furthermore, as shown in Figure 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 which is joined to the upper and side surfaces of the tunnel part 51a and forms a closed cross section together with the tunnel part 51a.

[0152] 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.

[0153] In this case, since the fastening bracket 24 or the tunnel reinforcement 25 constitutes a high-rigidity portion in the tunnel portion 51a, the housing front portion 35 of the battery housing 33 can be reliably supported, similarly to the above-described embodiment.

[0154] 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.

[0155] For example, the high-rigidity portion may be a portion in which a plurality of panel members are overlapped, 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. 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.

[0156] In addition, the battery housing 33 is configured so that the upper surface of the front housing 35 is positioned lower than the upper surface of the rear housing 34, but this is not limited to this, and the battery housing 33 may be configured so that the upper surfaces of the rear housing 34 and the front housing 35 are positioned at approximately the same vertical position.

[0157] This configuration ensures the rigidity of the battery housing 33 against the input load from the rear wheels.

[0158] Specifically, since the length of the battery housing 33 in the vehicle width direction at the front housing 35 is shorter than that at the rear housing 34, there is a risk that an unintended load will be applied near the boundary between the rear housing 34 and the front housing 35 due to the input load from the rear wheels.

[0159] 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, and the battery housing 33 can reliably function as a frame member that reinforces the vehicle body.

[0160] Furthermore, the configuration of the battery housing 33 is not limited to the above-mentioned embodiments 1 and 2, 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 in-vehicle equipment is fixed. [Explanation of symbols]

[0161] 1. Electric vehicles 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 part 12…Dash cross member 13...Damper support member 17…Fastening bracket 31…1st battery 32…2nd battery 33…Battery housing 34…Rear of the housing 35…Front of the housing 51…Floor panel front 51a…Tunnel section S2…rear seat R1…Guest room R2…Cargo compartment

Claims

1. 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 The seat is fixed to a highly rigid portion of the vehicle body located forward of the seat back. Cabin structure.

2. 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 The high rigidity portion is fixed to the rear floor panel in the vehicle width direction. A vehicle interior structure according to claim 1.

3. 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 The ends in the vehicle width direction are fixed to the left and right rear side frames. A vehicle interior structure according to claim 2.

4. 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 The end in the vehicle width direction is fixed to the damper support part. A vehicle interior structure according to claim 2.

5. 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 A space between the rear seats is formed with a length in the vehicle front-rear direction that separates the foot spaces of the rear seats in the vehicle width direction. A vehicle interior structure according to claim 1.

6. The housing front portion of the battery housing is The seat is fixed to the seat mounting part. A vehicle interior structure according to claim 1.

7. 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 A floor cross member is fixed to a closed cross-sectional portion formed by the front floor panel and the floor cross member. A vehicle interior structure according to claim 1.

8. 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 The vehicle is disposed above the tunnel section and fixed to the high rigidity portion provided in the tunnel section. A vehicle interior structure according to claim 1.

9. 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 A dash panel is fixed to a closed cross-sectional portion formed by the dash panel and the dash cross member. A vehicle interior structure according to claim 1.

Images