Body structure

Abstract

To provide a vehicle body structure which enables improvement of vehicle body rigidity while improving habitability in a passenger compartment.SOLUTION: A battery housing part which houses a battery and a battery non-housing part 202 which houses no battery are provided side by side in a vehicle anteroposterior direction below a passenger compartment. A second frame part 18 disposed at the battery non-housing part 202 expands its width in a vehicle width direction compared to a first frame part disposed at the battery housing part.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle body structure provided in an automobile. [Background technology]

[0002] For example, as disclosed in Patent Document 1, an electric vehicle may have a battery mounted below a floor panel to supply power to a traction motor. In Patent Document 1, a lower frame is provided at the bottom of the vehicle body. The lower frame includes a front cross member extending in the vehicle width direction at the front of the vehicle body, a center member extending rearward from the center of the front cross member in the vehicle width direction, and a pair of left and right rockers extending rearward from both ends of the front cross member in the vehicle width direction. The battery is housed in a space surrounded by the front cross member, the rockers, and the center member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-240762 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the lower frame and the battery are arranged over the entire area below the floor panel as in Patent Document 1, the height of the floor panel will increase overall due to the arrangement of the lower frame and the battery, which may result in a decrease in the livability of the vehicle interior. While it may be possible to address this issue by increasing the overall height of the vehicle, this method may not be feasible due to issues with the vehicle's design and the impact that the overall height has on parking spaces.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle body structure that can improve the vehicle body rigidity while increasing the livability in the vehicle interior. [Means for solving the problem]

[0006] To achieve the above object, a first aspect of the present disclosure can be premised on a vehicle body structure provided in an electric vehicle equipped with a traction motor. The vehicle body structure includes a battery unit disposed below the vehicle compartment and extending in the vehicle longitudinal direction, and including a battery that supplies power to the traction motor. A battery housing section that houses the battery and a non-battery housing section that does not house the battery are provided below the vehicle compartment, aligned in the vehicle longitudinal direction. The battery frame has a first frame section disposed in the battery housing section and a second frame section disposed in the non-battery housing section, the first frame portion and the second frame portion are central members serving as hollow reinforcing members extending in the vehicle front-rear direction, The second frame portion is wider in the vehicle width direction than the first frame portion.

[0007] This configuration makes it possible to lower the floor panel in the area corresponding to the non-battery housing section, thereby improving the livability of the vehicle interior. However, not housing a battery in the non-battery housing section may reduce the vehicle body rigidity in that area. In response to this, this configuration not only arranges the battery frame extending in the fore-and-aft direction of the vehicle in the lower part of the vehicle interior, but also has the second frame section arranged in the non-battery housing section wider and stronger than the first frame section arranged in the battery housing section, thereby increasing the vehicle body rigidity of the non-battery housing section.

[0008] In a second aspect of the present disclosure, the battery housing includes a front battery housing provided in front of the non-battery housing and a rear battery housing provided in rear of the non-battery housing, and the first frame includes a front first frame disposed in the front battery housing and a rear first frame disposed in the rear battery housing.

[0009] With this configuration, the number of batteries that can be mounted can be increased by storing batteries in both the front and rear battery storage sections, and in this case, the non-battery storage section located between the front and rear battery storage sections can be used to improve livability.

[0010] In a third aspect of the present disclosure ,before A first harness extending in the front-rear direction of the vehicle is disposed below the first frame portion and the second frame portion.

[0011] According to this configuration, the space below the first frame portion and the second frame portion can be used as a space for arranging the first harness.

[0012] In a fourth aspect of the present disclosure, a second harness for a bus bar connecting a battery housed in the front battery housing portion and a battery housed in the rear battery housing portion is arranged below the second frame portion so as to be aligned with the first harness in the vehicle width direction.

[0013] With this configuration, the second harness for the bus bar connects the front battery and the rear battery, and is therefore arranged to extend in the fore-and-aft direction below the second frame portion. By arranging the second harness for the bus bar and the first harness in the vehicle width direction, the vertical dimension can be shortened to avoid adversely affecting occupant comfort, and both harnesses can be arranged by effectively utilizing the space below the expanded second frame portion.

[0014] In a fifth aspect of the present disclosure, a recessed portion recessed downward is formed in a portion of the floor panel corresponding to the non-battery housing portion.

[0015] According to this configuration, by forming a recess in the floor panel, the height of that portion is lowered, which increases the space under the passenger's feet, for example, and improves comfort.

[0016] In a sixth aspect of the present disclosure , squaredThe vehicle further includes a center frame that is disposed above and spaced apart from the floor panel in the center of the passenger space in the vehicle width direction and extends in the fore-and-aft direction of the vehicle, and a connecting member that is fixed at its upper part to the center frame and at its lower part to a portion of the floor panel that corresponds to the second frame portion.

[0017] According to this configuration, by connecting the center frame to the second frame portion, which has a higher strength than the first frame portion, the center frame can be connected firmly. [Effects of the Invention]

[0018] As described above, a battery storage section and a non-battery storage section are provided below the passenger compartment, and the second frame section arranged in the non-battery storage section is wider in the vehicle width direction than the first frame section arranged in the battery storage section, thereby improving the livability inside the passenger compartment while improving the rigidity of the vehicle body. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a side view of an automobile equipped with a vehicle body structure according to an embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view showing a state in which the automobile is divided into an upper structure and a lower structure. [Figure 3] FIG. 2 is a perspective view of a part of the vehicle body structure as seen from above. [Figure 4] FIG. 2 is a plan view of a portion of the vehicle body structure. [Figure 5] 5 is a cross-sectional view taken along line VV in FIG. 4. [Figure 6] FIG. 10 is a perspective view showing a part of the lower structure with the cover member removed. [Figure 7] FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. [Figure 8] FIG. 7 is a cross-sectional view taken along the line BB in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

[0021] 1 is a side view of an automobile 1 equipped with a vehicle body structure A according to an embodiment of the present invention, as viewed from the left. In the description of this embodiment, the longitudinal direction of the vehicle will be simply referred to as the "longitudinal direction," the front side of the vehicle will be simply referred to as the "front side," and the "rear side" of the vehicle will be simply referred to as the "rear." The width direction of the vehicle is the lateral direction of the vehicle, with the left side of the vehicle being simply referred to as the "left side" and the right side of the vehicle being simply referred to as the "right side."

[0022] (Overall structure of the vehicle) The automobile 1 is a passenger vehicle, and a passenger space R1 for passengers is provided in the middle of the automobile 1 in the longitudinal direction. The passenger space R1 is provided with front seats (front seats) FS constituting the front seats, and rear seats (rear seats) RS constituting the rear seats. The front seats FS include a driver's seat located on the right (or left) side of the passenger space R1, and a passenger seat located on the left (or right) side of the passenger space R1. Rear seats RS are also located on the right and left sides of the passenger space R1. Although not shown, a third row of seats may be provided behind the rear seats RS. Furthermore, the rear seats RS are not essential and may be omitted.

[0023] A front door FD and a rear door RD are disposed on the left and right sides of the passenger space R1, respectively. In the case of an automobile 1 without a rear seat RS, the rear door RD can be omitted.

[0024] A front space R2 is provided in front of the passenger space R1 of the automobile 1. A powertrain PT can be installed in this front space R2 as needed. When the powertrain PT is installed in the front space R2, the front space R2 can also be called, for example, a powertrain storage room, a motor room, an engine room, etc. A bonnet hood BF is provided at the top of the front space R2.

[0025] Behind the passenger space R1 of the automobile 1, there is provided a luggage space R3 capable of accommodating luggage and the like. The luggage space R3 can be opened and closed by a trunk lid TR. Behind the passenger space R1 of the automobile 1 and below the luggage space R3, there is provided a rear space R4. A powertrain PT that generates power for the automobile 1 can be installed in this rear space R4 as needed. When the powertrain PT is installed in the rear space R4, the rear space R4 can also be called, for example, a powertrain storage room, a motor room, an engine room, etc.

[0026] The powertrain PT may be mounted in both the front space R2 and the rear space R4, or in only one of them. If the powertrain PT is mounted only in the front space R2, the vehicle is a front-wheel drive vehicle in which the powertrain PT drives only the front wheels FT. If the powertrain PT is mounted only in the rear space R4, the vehicle is a rear-wheel drive vehicle in which the powertrain PT drives only the rear wheels RT. Furthermore, if the powertrain PT is mounted in both the front space R2 and the rear space R4 and drives the front wheels FT and the rear wheels RT, the vehicle is a four-wheel drive vehicle.

[0027] The powertrain PT includes at least a traction motor M (shown in FIG. 2) for driving the drive wheels, and may also include a reducer, a transmission, etc. as necessary. Therefore, the automobile 1 is an electric vehicle. The traction motor M is disposed so that its center of rotation extends in the left-right direction. In addition to the traction motor M, the powertrain PT may also include, for example, a control unit, etc. The powertrain PT may also include an internal combustion engine. A battery unit Y (also shown in FIG. 1) for supplying power to the traction motor M is mounted on the bottom of the automobile 1. For example, the battery unit Y may be charged using power generated by the internal combustion engine, or at least one of the front wheels FT and the rear wheels RT may be driven by power generated by the internal combustion engine.

[0028] The type of automobile 1 does not have to be a four-door vehicle as shown in Fig. 1 as an example, and may be, for example, an automobile without a rear door RD. Furthermore, although not shown, the present invention can also be applied to an automobile in which the rear space R4 can be opened and closed with a tailgate, such as a hatchback.

[0029] As shown in Figure 2, automobile 1 is equipped with a lower structure 2 and an upper structure 3, and the lower structure 2 and upper structure 3 constitute a vehicle body structure A. Figure 2 shows the upper structure 3 with the doors FD, RD, bonnet hood BF, fenders, windshield, roof, center pillars, rear pillars, bumpers, front and rear lighting devices, instrument panel, front and rear seats, etc., originally equipped on the upper structure 3, removed. Figure 2 also shows the lower structure 2 with the front wheels FT, rear wheels RT, suspension devices, etc., originally equipped on the lower structure 2, removed.

[0030] The lower structure 2 is equipped with a battery unit Y. The battery unit Y has a front battery FB, a rear battery RB, and a frame 10 that surrounds the front battery FB and the rear battery RB. The lower structure 2 also has a front support frame 20 that extends forward from the front of the frame 10, and a rear support frame 30 that extends rearward from the rear of the frame 10.

[0031] Although not shown, in the case of a typical electric vehicle, the battery unit is often separate from the vehicle body and is detachably attached under the floor. However, in this embodiment, not only are the batteries FB, RB integrated into the frame-type frame 10 that surrounds the batteries FB, RB, but the front support frame 20 and rear support frame 30 are also integrated into the frame-type frame 10, and the front support frame 20 and rear support frame 30, together with the batteries FB, RB, are detachably attached to the upper structure 3.

[0032] Specifically, the automobile 1 of this embodiment is configured to be separable into an upper and lower structure 2 having batteries FB, RB, and an upper structure 3 that forms the passenger space R1 and the luggage compartment space R3. Being separable into upper and lower structures means that the lower structure 2 is integrated with the upper structure 3 using fastening members such as bolts, nuts, and screws, without using welding, adhesives, or the like. This allows the lower structure 2 to be separated from the upper structure 3 as needed when performing maintenance or repairs on the automobile 1 after it has been delivered to the user, improving maintainability.

[0033] Here, a ladder frame type vehicle body structure is known as an automobile body structure. In the case of a ladder frame type vehicle body structure, the ladder frame can be separated into an upper and lower portion and a cabin. However, since the ladder frame extends continuously in the fore-and-aft direction, it mainly bears the collision load in the event of a frontal collision and a rearward collision. In the event of a side collision, the ladder frame only auxiliarily bears the collision load, and it is the cabin that mainly bears the collision load. In this way, in a ladder frame type vehicle body structure, the components that bear the collision load in the event of a frontal collision and a rearward collision and in the event of a side collision are usually separated.

[0034] In contrast, in the case of the automobile 1 of this embodiment, the lower structure 2 having the front support frame 20 and rear support frame 30 and the upper structure 3 are separable, but in the event of a frontal collision, a rear collision, or a side collision, the collision load is received by the lower structure 2 and the upper structure 3, and the collision load can be distributed and absorbed between the two structures 2, 3, which is a significant difference in technical concept from a conventional ladder frame type vehicle body structure. Below, the structures of the lower structure 2 and the upper structure 3 will be explained in order.

[0035] (undercarriage) First, we will explain the lower structure 2. In addition to the batteries FB, RB, the frame 10, the front support frame 20, and the rear support frame 30, the lower structure 2 also includes a power train PT, front wheels FT, rear wheels RT, and front suspension devices SP1, SP2 and rear suspension devices SP3, SP4 shown by imaginary lines in Fig. 4. There are no particular restrictions on the types of the front suspension devices SP1, SP2 and rear suspension devices SP3, SP4, and it is also possible to change the vehicle body structure depending on the types of the front suspension devices SP1, SP2 and rear suspension devices SP3, SP4.

[0036] As shown in FIG. 2 , the frame-type frame 10, which forms the framework of the battery unit Y, is a member for enclosing and protecting the front battery FB, the rear battery RB, harnesses, and the like. The frame-type frame 10 is formed large below a passenger-space-side floor panel 41 (described later), extending from near the left end to near the right end of the passenger-space-side floor panel 41 and from near the front end to near the rear end of the passenger-space-side floor panel 41. By providing the frame-type frame 10 over a wide area below the passenger-space-side floor panel 41 in this manner, it becomes possible to mount large-capacity batteries FB and RB in the automobile 1. The batteries FB and RB may be, for example, lithium-ion batteries, all-solid-state batteries, or other secondary batteries. The batteries FB and RB may also be so-called battery cells or battery packs containing multiple battery cells.

[0037] The frame 10 includes a left side member 11, a right side member 12, a front member 13, and a rear member 14. The left side member 11, the right side member 12, the front member 13, and the rear member 14 are made of, for example, an aluminum alloy extrusion, but may also be made of aluminum alloy plate material or press-formed steel plate material. In the following description, the term "extruded material" refers to an aluminum alloy extrusion material, and the term "press-formed material" refers to an aluminum alloy plate material or press-formed steel plate material. Furthermore, each member may be made of, for example, a casting, a die-cast, or the like.

[0038] The left side member 11, the right side member 12, the front member 13, and the rear member 14 all have rectangular cross-sectional shapes in a direction perpendicular to the longitudinal direction. The left side member 11, the right side member 12, the front member 13, and the rear member 14 are all disposed at the same height and extend substantially horizontally. When joining the lower structure 2 to the upper structure 3, the front member 13 is fastened to the bottom of the dash panel 50 with fastening members, and the left side member 11 and the right side member 12 are fastened to the left and right side sills 60 with fastening members, respectively. The rear member 14 is fastened to a connection panel 43 (described later) with fastening members.

[0039] The left side member 11 is provided at the left end of the lower structure 2 and extends in the front-rear direction. The right side member 12 is provided at the right end of the lower structure 2 and extends in the front-rear direction. The left side member 11 and the right side member 12 are respectively disposed inside, in the vehicle width direction, left and right side sills 60 (described later). As also shown in FIG. 5 and other figures, the front member 13 is provided at the front of the battery unit Y and extends in the left-right direction from the front end of the left side member 11 to the front end of the right side member 12. The left end of the front member 13 is connected to the front end of the left side member 11, and the right end of the front member 13 is connected to the front end of the right side member 12. The rear member 14 is provided at the rear of the battery unit Y and extends in the left-right direction from the rear end of the left side member 11 to the rear end of the right side member 12. The left end of the rear member 14 is connected to the rear end of the left side member 11 , and the right end of the rear member 14 is connected to the rear end of the right side member 12 .

[0040] A cover member 15 serving as a bottom plate is attached to the lower part of the frame 10. The frame 10 is closed from below by the cover member 15. The cover member 15 extends substantially horizontally and is fixed to the lower surfaces of the left side member 11, the right side member 12, the front member 13, and the rear member 14, and is also fixed to a side sill 60 as described below. The upper part of the frame 10 may be closed by a lid (not shown) or by a passenger space side floor panel 41 (described below). Electric power from batteries FB, RB housed in the frame 10 is supplied to a driving motor M via a driving control circuit (not shown). Furthermore, the batteries FB, RB can be charged via a charging socket (not shown).

[0041] As shown in Fig. 6, the front portion inside the frame-type frame 10 is a front battery housing section 200 that houses the front battery FB, and the rear portion inside the frame-type frame 10 is a rear battery housing section 201 that houses the rear battery RB. The section between the front battery housing section 200 and the rear battery housing section 201 is a section that does not house a battery, and this section that does not house a battery is a non-battery housing section 202. In other words, the front battery housing section 200, the non-battery housing section 202, and the rear battery housing section 201 are arranged side by side in the front-to-rear direction. Note that either the front battery housing section 200 or the rear battery housing section 201 may be omitted.

[0042] FIG. 5 shows a cross section of the center portion of the vehicle body structure A in the left-right direction. As shown in FIG. 5, first to third battery-side cross members 10A, 10B, and 10C made of hollow members are provided inside the frame 10 as reinforcing members extending in the left-right direction. The first to third battery-side cross members 10A, 10B, and 10C all have the same height, which is the same as the height of the front member 13 and the rear member 14. The first to third battery-side cross members 10A, 10B, and 10C may be made of extruded material or press-formed material. In this embodiment, three battery-side cross members 10A, 10B, and 10C are provided, but the number of battery-side cross members 10A, 10B, and 10C can be increased or decreased depending on the longitudinal dimension of the frame 10.

[0043] The first to third battery-side cross members (battery-side cross members 10A, 10B, 10C) are spaced apart from one another in the front-to-rear direction, with the first battery-side cross member 10A positioned at the front and the third battery-side cross member 10C positioned at the rear. The lower portions of each battery-side cross member 10A, 10B, 10C are fixed to the upper surface of the cover member 15. The left ends of each battery-side cross member 10A, 10B, 10C are fixed to the inner surface (right side surface) of the left side member 11, and the right ends of each battery-side cross member 10A, 10B, 10C are fixed to the inner surface (left side surface) of the right side member 12. In other words, the battery-side cross members 10A, 10B, 10C are members that connect the left side member 11 and the right side member 12.

[0044] A front central member 16 and first to third rear central members 17 to 19 are provided inside the frame 10 as hollow reinforcing members extending in the front-to-rear direction. The front central member 16 and the first to third rear central members 17 to 19 can also be called a battery frame extending in the front-to-rear direction, and the battery unit Y has a structure having a battery frame made up of the front central member 16 and the first to third rear central members 17 to 19, etc. The battery frame may include a left side member 11, a right side member 12, a front member 13, and a rear member 14.

[0045] The front central member 16 and the first to third rear central members 17 to 19 are disposed at approximately the same height and are provided in the center of the rectangular frame 10 in the left-right direction. The lower ends of the front central member 16 and the first to third rear central members 17 to 19 are attached to the upper surface of the cover member 15. The front central member 16 and the first to third rear central members 17 to 19 extend from the front member 13 to the rear member 14.

[0046] The front central member 16 is a front first frame portion disposed in the front battery housing portion 200, and is disposed between the front member 13 and the first battery-side cross member 10A. The front end of the front central member 16 is fixed to the left-right center of the front member 13, and the rear end of the front central member 16 is fixed to the left-right center of the first battery-side cross member 10A. Therefore, the front member 13 is a member that extends to connect the front end portions of the left side member 13 and the right side member 12 with the front end portion of the front central member 16.

[0047] The first rear central member 17 is a front first frame portion disposed in the front battery storage portion 200 behind the front central member 16, and is disposed between the first battery side cross member 10A and the second battery side cross member 10B. The front end of the first rear central member 17 is fixed to the left-right center of the first battery side cross member 10A, and the rear end of the first rear central member 17 is fixed to the left-right center of the second battery side cross member 10B.

[0048] The second rear central member 18 is a second frame portion disposed in the non-battery housing portion 202 behind the first rear central member 17, and is disposed between the second battery-side cross member 10B and the third battery-side cross member 10C. The front end of the second rear central member 18 is fixed to the left-right center of the second battery-side cross member 10B, and the rear end of the second rear central member 18 is fixed to the left-right center of the third battery-side cross member 10C.

[0049] The third rear central member 19 is a rear first frame portion disposed in the rear battery storage portion 201 behind the second rear central member 18, and is disposed between the third battery-side cross member 10C and the rear member 14. The front end of the third rear central member 19 is fixed to the left-right center of the third battery-side cross member 10C, and the rear end of the third rear central member 19 is fixed to the left-right center of the rear member 14.

[0050] Therefore, the first to third battery side cross members 10A, 10B, 10C, the front central member 16, and the first to third rear central members 17 to 19 are arranged in a lattice pattern inside the frame-type frame 10 and connected to each other, thereby further enhancing the reinforcing effect of the frame-type frame 10 and, ultimately, the reinforcing effect of the lower structure 2.

[0051] When an imaginary line extending in the front-to-rear direction is imagined in a plan view, the front central member 16 and the first to third rear central members 17 to 19 are positioned in the left-to-right direction so as to be disposed on that imaginary line. In other words, the first to third rear central members 17 to 19 are disposed so as to be located on an imaginary extension line of the front central member 16 to the rear.

[0052] FIG. 7 is a cross-sectional view taken along line AA in FIG. 6 , showing a cross section corresponding to the front battery storage section 200. Front batteries FB are housed on both the left and right sides of a first rear central member 17 provided within the frame 10. A first harness 204 extending in the front-to-rear direction is disposed below the first rear central member 17. This first harness 204 extends from the front to the rear of the frame 10, and is therefore disposed so as to pass below the front central member 16 and the first to third rear central members 17 to 19 and extend in the front-to-rear direction. In this embodiment, two first harnesses 204 are disposed side by side in the vehicle width direction, but this is not limiting, and one first harness 204, or three or more first harnesses 204 may be used.

[0053] 8 is a cross-sectional view taken along line BB in FIG. 6 , showing a cross section corresponding to the non-battery housing portion 202. A second rear central member 18 is provided in the non-battery housing portion 202. The second rear central member 18 is wider in the vehicle width direction than the first rear central member 17 shown in FIG. 7 . Specifically, the dimension of the second rear central member 18 in the vehicle width direction is set longer than the dimension of the first rear central member 17 in the vehicle width direction, and when the first rear central member 17 and the second rear central member 18 are viewed from the front-rear direction, the left end of the second rear central member 18 is disposed so as to protrude further to the left than the left end of the first rear central member 17, and the right end of the second rear central member 18 is disposed so as to protrude further to the right than the right end of the first rear central member 17. As a result, the width of the space 210 (shown in FIG. 8) directly below the second rear central member 18 is wider than the width of the space 220 (shown in FIG. 7) directly below the first rear central member 17. Furthermore, although the rigidity of the portion where the front battery FB and rear battery RB are not present may be easily reduced, the provision of the wide second rear central member 18 in the portion where the front battery FB and rear battery RB are not present can prevent a reduction in rigidity. Furthermore, because the first rear central member 17 and the second rear central member 18 are disposed at the same height, the vertical dimensions of the space 210 and the space 220 are approximately the same.

[0054] In addition to the first harness 204, a second harness 205 for the bus bar is also disposed below the second rear central member 18. The second harness 205 for the bus bar is a harness for connecting the front battery FB and the rear battery RB. Therefore, it extends in the front-to-rear direction. However, it does not pass through the front battery housing 200 or the rear battery housing 201, but passes through the non-battery housing 202. The second harness 205 is located on both the left and right sides of the first harness 204. Therefore, more harnesses 204, 205 are disposed in the space 210 below the second rear central member 18 than in the space 220 below the first rear central member 17. However, since the width of the space 210 is relatively wide, disposing more harnesses 204, 205 does not pose a problem. The arrangement of the first harness 204 and the second harness 205 is not limited to the arrangement shown in the figure and can be arranged in any manner.

[0055] As shown in Fig. 2, a pair of left and right front support frames 20 are provided and connected to the front members 13 of the frame 10. The front powertrain PT is attached to the front support frames 20 via mounting members (not shown). Drive shafts S1 are provided on the left and right of the lower structure 2 to transmit the output of the powertrain PT (the rotational force of the travel motor M) to the left and right front wheels FT, respectively.

[0056] Similar to the front support frames 20, a pair of rear support frames 30 are provided on the left and right, and are connected to the rear members 14 of the frame 10. The rear powertrain PT is attached to the rear support frames 30 via mounting members (not shown). Drive shafts S2 are provided on the left and right of the lower structure 2 to transmit the output of the powertrain PT (the rotational force of the travel motor M) to the left and right rear wheels RT, respectively.

[0057] (superstructure) Next, the upper structure 3 will be described. The upper structure 3 includes a floor constituent member 40, a dash panel 50, and a pair of left and right side sills 60. The floor constituent member 40 is a member disposed above the frame-type frame 10 and rear support frame 30 of the lower structure 2. The floor constituent member 40 includes a passenger-space-side floor panel (first floor panel) 41 that constitutes the floor of the passenger space R1 in which the front seats FS and rear seats RS (shown in FIG. 1) on which passengers sit are provided, a luggage-space-side floor panel (second floor panel) 42 that constitutes the floor of the luggage space R3, and a connection panel 43 that connects the rear portion of the passenger-space-side floor panel 41 and the front portion of the luggage-space-side floor panel 42.

[0058] The floor structural member 40 can be formed, for example, from a member obtained by press-forming a steel plate or the like. The passenger space side floor panel 41, the luggage space side floor panel 42, and the connecting panel 43 may be integrally formed, or may be formed separately and then connected. Furthermore, in this embodiment, the passenger space side floor panel 41, the luggage space side floor panel 42, and the connecting panel 43 are described as being divided into three parts, but the floor structural member 40 including these panels 41 to 43 may also be called the floor panel. Furthermore, only the passenger space side floor panel 41 may also be called the floor panel.

[0059] The passenger space-side floor panel 41 extends from the front to the rear of the passenger space R1 and from the left side to the right side of the passenger space R1. The passenger space-side floor panel 41 according to this embodiment has a floor tunnel-less structure, i.e., does not have a tunnel portion. That is, conventional automotive floor panels generally have a tunnel portion that bulges upward and extends in the front-to-rear direction. This tunnel portion is used, for example, to pass an exhaust pipe extending rearward from an engine mounted in an engine compartment at the front of the vehicle or a propeller shaft that transmits engine power to the rear wheels. The diameter of the exhaust pipe or propeller shaft is often 10 cm or more. Furthermore, to prevent interference between the exhaust pipe or propeller shaft and the floor panel, a gap of at least several centimeters must be provided between the exhaust pipe or propeller shaft and the floor panel. Furthermore, an insulator or the like may be provided on the inner surface of the tunnel portion. Due to these factors, the height of the tunnel from the floor panel can be, for example, 15 cm or more or 20 cm or more, and in terms of its position relative to the seat, the upper end of the tunnel is higher than the lower end of the seat cushion on the seat rail or the vertical center of the seat cushion. A structure without a tunnel that bulges upward like this is called a tunnel-less structure.

[0060] As described above, the passenger space side floor panel 41 does not have a tunnel portion that is 15 cm or more or 20 cm or more in height from the upper surface of the passenger space side floor panel 41, but may have a low bulge portion that is 5 cm or less or 10 cm or less in height from the upper surface of the passenger space side floor panel 41. In the case of such a low bulge portion, an exhaust pipe or propeller shaft cannot be passed through it, and therefore it does not function as a tunnel portion. Therefore, even if the floor panel has a low bulge portion that is 5 cm or less or 10 cm or less in height from the upper surface of the passenger space side floor panel 41, it is still a floor panel with a tunnel-less structure.

[0061] In this embodiment, because the powertrain PT includes the traction motor M, there is no need to mount an internal combustion engine in the front space R2, and therefore there is no need to lead the exhaust pipe to the rear of the vehicle. Furthermore, if the powertrain PT is mounted in the rear space R4, the powertrain PT can also drive the rear wheels RT, eliminating the need for a propeller shaft. Therefore, the passenger space side floor panel 41 can have a tunnel-less structure.

[0062] As shown in FIG. 3 , a recess 41a bulging downward is formed in the front-rear direction intermediate portion of the passenger-space-side floor panel 41. Specifically, the recess 41a is formed in a portion of the passenger-space-side floor panel 41 corresponding to the non-battery housing portion 202, where an occupant's feet can be placed. The recess 41a has a bottom surface 41b on which a rear seat occupant seated in the rear seat RS can place their feet. The bottom surface 41b is formed substantially horizontally. The front portion of the recess 41a is formed to gradually deepen toward the rear. The recess 41a can be formed continuously from the left side to the right side of the passenger-space-side floor panel 41. The bottom surface 41b is set to be substantially the same height as the lower portion of the side sill 60 (described later), which allows the height of the bottom surface 41b to be sufficiently low. This allows the non-battery housing portion 202 of the lower structure 2 to be used to expand the passenger's living space.

[0063] The positional relationship in the front-to-rear direction between the recessed portion 41a and the seat cushion of the rear seat RS is set so that when a rear seat occupant sitting in the rear seat RS puts their feet directly below, their feet naturally rest on the bottom surface portion 41b. The position of the front of the recessed portion 41a is set so that when a rear seat occupant sitting in the rear seat RS moves their feet diagonally forward, their feet rest on the bottom surface portion 41b. The position and front-to-rear dimension of the recessed portion 41a are set so that the rear seat occupant's feet can rest on the bottom surface portion 41b even if they move their feet slightly forward or backward.

[0064] A floor frame 41c extending in the front-to-rear direction is provided in the center of the recessed portion 41a in the left-to-right direction. The floor frame 41c is formed so as to surround the second rear central member 18 of the lower structure 2 from above and both sides, and when the lower structure 2 and the upper structure 3 are integrated, the second rear central member 18 is housed inside the floor frame 41c from below. By providing the floor frame 41c, it is possible to reinforce the portion where the recessed portion 41a is formed.

[0065] The luggage space-side floor panel 42 is positioned higher than the passenger space-side floor panel 41. The rear space R4 is located below the luggage space-side floor panel 42. In other words, the luggage space-side floor panel 42 is disposed so as to separate the luggage space R3 from the rear space R4. Because the luggage space-side floor panel 42 is disposed higher than the passenger space-side floor panel 41, the connection panel 43 extends in the vertical direction. The connection panel 43 may be vertical, or may be inclined so that it is positioned further rearward as it goes higher.

[0066] As also shown in Figure 5, the dash panel 50 is a component that serves as a partition between the front space R2 and the passenger space R1, and extends upward from the front of the passenger space side floor panel 41 and also extends in the left-right direction, separating the front of the passenger space R1.

[0067] As shown in Fig. 4, the left and right side sills 60 are disposed so as to extend in the front-to-rear direction at both left and right end portions of the passenger space side floor panel 41. The left end portion of the passenger space side floor panel 41 is connected to the vertical middle portion of the left side sill 60. A battery unit Y including batteries FB, RB is disposed below the passenger space side floor panel 41, so that the lower portions of the side sills 60 overlap with the batteries FB, RB in a side view of the vehicle. Similarly, the right side sill 60 is connected to the right end portion of the passenger space side floor panel 41.

[0068] As shown in FIG. 3, the upper structure 3 is equipped with a pair of left and right hinge pillars 70. The right hinge pillar 70 extends upward from the front end of the right side sill 60. The left hinge pillar 70 also extends upward from the front end of the left side sill 60. Left and right front doors FD (shown in FIG. 1) are rotatably attached to the left and right hinge pillars 70, respectively. The left edge of the dash panel 50 is connected to the right side surface of the left hinge pillar 70. The right edge of the dash panel 50 is connected to the left side surface of the right hinge pillar 70. Although not shown, a center pillar, a rear pillar, etc. are also provided on the upper structure 3.

[0069] As shown in FIG. 2, a left front-wheel suspension support member 51A is provided on the left side of the upper structure 3, forward of the dash panel 50, supporting a suspension device (front suspension device) SP1 (shown by an imaginary line in FIG. 4) for the left front wheel FT. Furthermore, a right front-wheel suspension support member 51B is provided on the right side of the upper structure 3, forward of the dash panel 50, supporting a suspension device (front suspension device) SP2 (shown by an imaginary line in FIG. 4) for the right front wheel FT. The type of suspension devices SP1 and SP2 is not particularly limited, but may include, for example, a suspension arm, shock absorbers, springs, etc. that support the front wheel FT so that it can swing freely up and down. The vehicle body-side ends of the suspension arms and the upper ends of the shock absorbers are attached to the front-wheel suspension support members 51A and 51B. The front-wheel suspension support members 51A and 51B may be made of, for example, aluminum die-cast, but are not limited to this and may also be made of a combination of steel plates, etc.

[0070] As shown in Figure 2 and other figures, three left-side fixing frames 52A for fixing a left front-wheel suspension support member 51A are provided on the left side forward of the dash panel 50. The three left-side fixing frames 52A are spaced apart in the vertical direction, and the front portions of the three left-side fixing frames 52A are fixed to the front-wheel suspension support member 51A. Meanwhile, the rear portions of the uppermost and vertically intermediate left-side fixing frames 52A are fixed to the left hinge pillar 70 or the left side of the dash panel 50. Furthermore, the rear portion of the lowest left-side fixing frame 52A is fixed to the left side sill 60.

[0071] As only a portion of the right side is shown in Figure 3, three right side fixing frames 52B for fixing a right front wheel suspension support member 51B are provided on the right side, forward of the dash panel 50. The three right side fixing frames 52B are spaced apart in the vertical direction, and the front portions of the three right side fixing frames 52B are fixed to the front wheel suspension support member 51B. Meanwhile, the rear portions of the uppermost and vertically intermediate right side fixing frames 52B are fixed to the right hinge pillar 70 or the right side of the dash panel 50. Furthermore, the rear portion of the lowest right side fixing frame 52B is fixed to the right side sill 60.

[0072] 2, a left-side crash can 53A extending forward is fixed to the front portion of the left front wheel suspension support member 51A. A right-side crash can 53B extending forward is fixed to the front portion of the right front wheel suspension support member 51B. Bumper reinforcements 140 extending in the left-right direction are attached to the front portions of the left and right crash cans 53A, 53B.

[0073] As shown in Fig. 4, the upper structure 3 includes a left front frame 54A and a right front frame 54B. That is, provided forward of the dash panel 50 are the left front frame 54A, which connects the front portion of a center frame 80 (described later) to a left front wheel suspension support member 51A, and the right front frame 54B, which connects the front portion of the center frame 80 to a right front wheel suspension support member 51B. The left front frame 54A is inclined so that it is positioned more leftward as it approaches the front. The right front frame 54B is inclined so that it is positioned more rightward as it approaches the front.

[0074] 3, the passenger space-side floor panel 41 has a front cross member 44A, an intermediate cross member 44B, a recessed portion front cross member 44C, and a recessed portion rear cross member 44D. The front cross member 44A, the intermediate cross member 44B, the recessed portion front cross member 44C, and the recessed portion rear cross member 44D extend in the left-right direction and are fixed to the upper surface of the passenger space-side floor panel 41. Therefore, the front cross member 44A, the intermediate cross member 44B, the recessed portion front cross member 44C, and the recessed portion rear cross member 44D are arranged in the passenger space R1 so as to intersect with a center frame 80 (described later) in a plan view.

[0075] The front cross member 44A is disposed in front of the passenger space side floor panel 41. The front portion of the front cross member 44A is also joined to the lower part of the dash panel 50. The intermediate cross member 44B is disposed rearward of the front cross member 44A and forward of the recessed portion 41a, and the intermediate cross member 44B and the passenger space side floor panel 41 form a closed cross section.

[0076] The recessed portion front cross member 44C is disposed rearward of the intermediate cross member 44B and extends in the left-right direction along the front portion of the recessed portion 41a. The recessed portion rear cross member 44D is disposed rearward of the recessed portion front cross member 44C and extends in the left-right direction along the rear portion of the recessed portion 41a. The recessed portion front cross member 44C and the passenger space side floor panel 41 form a closed cross section, and the recessed portion rear cross member 44D and the passenger space side floor panel 41 also form a closed cross section. By providing the recessed portion front cross member 44C and the recessed portion rear cross member 44D, the portion where the recessed portion 41a is formed can be reinforced. The front portion of the floor frame 41c disposed inside the recessed portion 41a is connected to the left-right center portion of the recessed portion front cross member 44C, and the rear portion of the floor frame 41c is connected to the left-right center portion of the recessed portion rear cross member 44D.

[0077] 5 and other figures, the upper structure 3 includes a center frame 80 that extends continuously in the front-to-rear direction from the dash panel 50 to the connecting panel 43. This center frame 80 is located in the center in the left-to-right direction. In other words, the positions of the front central member 16 and the first to third rear central members 17-19 and the center frame 80 are set so that the front central member 16 and the first to third rear central members 17-19 and the center frame 80 overlap one another in a plan view.

[0078] The center frame 80 is disposed above and spaced apart from the passenger space-side floor panel 41 in the left-right center of the passenger space R1. The rear of the center frame 80 is connected to the connection panel 43. The left front seat FS and rear seat RS are disposed on the left side of the center frame 80, while the right front seat FS and rear seat RS are disposed on the right side of the center frame 80.

[0079] By disposing the center frame 80 above and spaced apart from the passenger-space-side floor panel 41, components, for example, can be disposed between the lower surface of the center frame 80 and the upper surface of the passenger-space-side floor panel 41. The space between the lower surface of the center frame 80 and the upper surface of the passenger-space-side floor panel 41 can also be used as an item storage area. As shown in FIG. 5 , the center frame 80 according to this embodiment has a bent portion 80A that bends vertically in the middle portion in the front-to-rear direction. Providing the bent portion 80A in the center frame 80 allows, for example, the rear portion to be lower than the front portion, thereby improving the comfort of rear seat passengers. Furthermore, since the front portion of the center frame 80 can be higher than the rear portion, it is possible to place items, for example, below the front portion of the center frame 80. The bent portion 80A is formed in a portion of the center frame 80 closer to the front than the center portion in the front-to-rear direction.

[0080] That is, the center frame 80 includes a front frame member 81 extending in the front-to-rear direction, a rear frame member 82 disposed rearward of the front frame member 81, and a tubular connecting member 83 connecting the rear portion of the front frame member 81 and the front portion of the rear frame member 82. The front frame member 81 and the rear frame member 82 are hollow, i.e., tubular and extending in the front-to-rear direction, and may be made of, for example, an extruded material. Making the front frame member 81 and the rear frame member 82 hollow results in lightweight, highly rigid members. The vertical cross sections of the front frame member 81 and the rear frame member 82 taken along the vehicle width direction are rectangular. Therefore, the front frame member 81 and the rear frame member 82 have upper and lower wall portions extending in the left-to-right direction, and left and right side wall portions extending in the up-down direction. The cross-sectional shapes of the front frame member 81 and the rear frame member 82 are not limited to rectangular, but may be polygonal with pentagons or more sides, or may be circular or elliptical.

[0081] The longitudinal dimension of the rear frame member 82 is set to be longer than the longitudinal dimension of the front frame member 81. Therefore, the connection portion between the front frame member 81 and the rear frame member 82 is located forward of the center of the passenger space R1 in the fore-and-aft direction. Note that the center frame 80 is not limited to a two-piece structure consisting of the front frame member 81 and the rear frame member 82, and may be configured as a single member from the front to the rear, or may have a three-piece structure.

[0082] The front frame member 81 is inclined at a first inclination angle with respect to the horizontal plane and extends linearly. On the other hand, the rear frame member 82 is inclined at a second inclination angle with respect to the horizontal plane that is smaller than the first inclination angle and extends linearly. In other words, the rear frame member 82 is inclined at an inclination angle different from that of the front frame member 81, thereby forming a bent portion 80A that bends downward at the connection portion between the front frame member 81 and the rear frame member 82. In this embodiment, the rear frame member 82 is arranged so that it inclines downward toward the rear. Note that the front frame member 81 and the rear frame member 82 may have the same inclination angle. In this case, the bent portion 80A is not formed.

[0083] As shown in FIG. 4, the center frame 80 has a left frame component 84A and a right frame component 84B that form the front portion of the center frame 80, resulting in a branched shape in the left-right direction. The left frame component 84A and the right frame component 84B are spaced apart in the left-right direction. The rear portion of the left frame component 84A is fixed to the left side surface of the front frame component 81 at the midpoint in the fore-aft direction. The left frame component 84A is inclined in a plan view so that it is positioned more leftward as it moves forward from the portion where it is fixed to the front frame component 81. The front portion of the left frame component 84A is connected to a portion of the dash panel 50 that is spaced upward from the passenger space-side floor panel 41. The rear portion of the left front frame 54A is connected to the front portion of the left frame component 84A.

[0084] The rear portion of the right frame component 84B is fixed to the right side surface of the front-rear direction intermediate portion of the front frame member 81. The right frame component 84B is inclined in a plan view so that it is positioned further to the right as it moves forward from the portion where it is fixed to the front frame member 81. The front portion of the right frame component 84B is connected to a portion of the dash panel 50 that is spaced above the passenger space side floor panel 41. The rear portion of the right front frame 54B (shown in FIG. 4) is connected to the front portion of the right frame component 84B.

[0085] The upper structure 3 is equipped with first to third connecting members 101 to 103. The first to third connecting members 101 to 103 extend upward from the passenger space side floor panel 41, have their upper portions fixed to the center frame 80, and are members for connecting the center frame 80 to the passenger space side floor panel 41. The first connecting member 101 is disposed foremost in the passenger space R1, and is spaced rearward from the dash panel 50. A lower portion of the first connecting member 101 is fixed to a portion of the passenger space side floor panel 41 that is spaced rearward from the dash panel 50, and an upper portion of the first connecting member 101 is fixed to a portion of the center frame 80 that is spaced rearward from the dash panel 50.

[0086] 3 and other figures, the second connecting member 102 is disposed rearward and spaced apart from the first connecting member 101. The lower portions of the first connecting member 101 and the second connecting member 102 are fixed to positions spaced apart from each other in the front-to-rear direction of the passenger space side floor panel 41. The upper portions of the first connecting member 101 and the upper portions of the second connecting member 102 are fixed to positions spaced apart from each other in the front-to-rear direction of the center frame 80.

[0087] As shown in Figure 3, the first connecting member 101 has a left-side member (left-side connecting member) 101A and a right-side member (right-side connecting member) 101B. The lower portions of the left-side member 101A and the right-side member 101B are fixed to the front cross member 44A. The left-side member 101A extends upward from the front cross member 44A at an angle in a front view so that the upper portion is positioned further left. The upper portion of the left-side member 101A is fixed to the front portion of the left frame component member 84A of the center frame 80.

[0088] The right-side member 101B extends upward from the front cross member 44A at an angle in a front view so that the upper part is positioned further to the right. The upper part of the right-side member 101b is fixed to the front part of the right-side frame component 84B of the center frame 80. The front parts of the left-side frame component 84A and the right-side frame component 84B are spaced apart in the left-right direction, so that most of the left-side member 101A and the right-side member 101B, excluding their lower parts, are spaced apart in the left-right direction, and the left-right distance between the left-side member 101A and the right-side member 101B becomes wider as it goes upward.

[0089] A lower portion of the second connecting member 102 is fixed to the intermediate cross member 44B. An upper portion of the second connecting member 102 is fixed to the bent portion 80A of the center frame 80. Therefore, the second connecting member 102 extends from the bent portion 80A of the center frame 80 toward the floor panel 41 on the passenger space side.

[0090] The lower part of the third connecting member 103 is fixed to the recessed portion front cross member 44C. The recessed portion front cross member 44C is disposed directly above the second rear central member 18, and the left-right central part of the recessed portion front cross member 44C is fixed to the front part of the second rear central member 18. In other words, the lower part of the third connecting member 103 is fixed to a part of the passenger space side floor panel 41 that corresponds to the second rear central member 18. Meanwhile, the upper part of the third connecting member 103 is fixed to the lower wall part of the rear frame member 82 of the center frame 80.

[0091] (Load path at the time of collision) Next, let us consider a case where the automobile 1 has a frontal collision. When the automobile 1 has a frontal collision, an impact load is input from the bumper reinforcement 140 to the left crash can 53A and the right crash can 53B. The impact load input to the left crash can 53A and the right crash can 53B is transmitted to the left and right front wheel suspension support members 51A, 51B.

[0092] Because the left and right front wheel suspension support members 51A, 51B are connected to the dash panel 50, the center frame 80, and the front support frame 20, an impact load input to the left and right front wheel suspension support members 51A, 51B is transmitted to and absorbed by the dash panel 50, the center frame 80, and the front support frame 20. Furthermore, because the left and right front wheel suspension support members 51A, 51B are also connected to the left and right side sills 60, 60, an impact load input to the left and right front wheel suspension support members 51A, 51B is also transmitted to and absorbed by the left and right side sills 60, 60.

[0093] In addition, the left front frame 54A connects the front of the center frame 80 to the left front wheel suspension support member 51A, and the right front frame 54B connects the front of the center frame 80 to the right front wheel suspension support member 51B, so the impact load is also input to and absorbed by the center frame 80.

[0094] Furthermore, because the rear of the front support frame 20 is connected to the frame-type frame 10 of the battery unit Y, the impact load input to the front support frame 20 is also transmitted to and absorbed by the frame-type frame 10. The frame-type frame 10 includes not only the left side member 11 and the right side member 12 extending in the front-rear direction, but also the front central member 16 and the first to third rear central members 17 to 19, which are also provided to extend in the front-rear direction. Therefore, the impact load can be absorbed by these members 11, 12, 16 to 19. Furthermore, a floor frame 41c is provided inside the recessed portion 41a of the passenger-space-side floor panel 41, extending in the front-rear direction in the same way as the front central member 16 and the first to third rear central members 17 to 19. Therefore, the impact load can also be absorbed by the floor frame 41c. In this way, the provision of multiple load paths ensures that the passenger space R1 is maintained during a collision.

[0095] (Effects of the embodiment) As described above, according to this embodiment, since the non-battery housing portion 202 is located below the passenger space-side floor panel 41, the passenger space-side floor panel 41 can be lowered in the portion corresponding to the non-battery housing portion 202, thereby increasing the foot space for rear seat passengers. This improves the livability of the vehicle interior.

[0096] The fact that no battery is housed in the non-battery housing section 202 may result in a decrease in the vehicle body rigidity in that area, but in this embodiment, not only are the front central member 16 and the first to third rear central members 17 to 19 extending in the fore-and-aft direction arranged below the passenger space side floor panel 41, but the second rear central member 18 arranged in the non-battery housing section 202 is wider and stronger than the front central member 16 and the third rear central member 19 arranged in the battery housing sections 200, 201, so the vehicle body rigidity of the non-battery housing section 202 can also be increased.

[0097] In addition, the number of batteries that can be mounted can be increased by storing batteries FB and RB in the front battery storage section 200 and the rear battery storage section 201, respectively.In this case, the non-battery storage section 202 located between the front battery storage section 200 and the rear battery storage section 201 can be used to improve livability.

[0098] Furthermore, by arranging the first harness 204 and the second harness 205 side by side in the vehicle width direction below the widened second rear central member 18, it is possible to arrange both harnesses 204, 205 together while shortening the vertical dimension and not adversely affecting the livability.

[0099] The above-described embodiments are merely examples in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0100] As described above, the vehicle body structure according to the present invention can be used in, for example, electric vehicles and other automobiles. [Explanation of symbols]

[0101] 1. Automobiles 10 Border frame 16 Front center member (first front frame section) 17. First rear center member (first front frame section) 18 Second rear center member (second frame section) 19. Third rear center member (rear first frame section) 41 Passenger space side floor panel 80 Center Frame 103 Third connecting member 200 Front battery compartment 201 Rear battery compartment 202 Non-battery storage area 204 First Harness 205 Second Harness FB, RB battery M Traction motor

Claims

1. A vehicle body structure provided on an electric vehicle equipped with a traction motor, a battery unit that is disposed below a passenger compartment and extends in a vehicle front-rear direction, and that includes a battery that supplies power to the driving motor; a battery housing section in which the battery is housed and a non-battery housing section in which the battery is not housed are provided at a lower part of the vehicle compartment and are aligned in the front-rear direction of the vehicle; the battery frame has a first frame portion disposed in the battery housing portion and a second frame portion disposed in the non-battery housing portion, the first frame portion and the second frame portion are central members serving as hollow reinforcing members extending in the vehicle front-rear direction, The second frame portion has a width greater than that of the first frame portion in the vehicle width direction.

2. The vehicle body structure according to claim 1, the battery housing portion includes a front battery housing portion provided in front of the non-battery housing portion and a rear battery housing portion provided in rear of the non-battery housing portion, A vehicle body structure in which the first frame portion includes a front first frame portion disposed in the front battery storage portion and a rear first frame portion disposed in the rear battery storage portion.

3. The vehicle body structure according to claim 2, A vehicle body structure in which a first harness extending in a front-rear direction of the vehicle is arranged below the first frame portion and the second frame portion.

4. The vehicle body structure according to claim 3, a second harness for a bus bar connecting the battery housed in the front battery housing portion and the battery housed in the rear battery housing portion is arranged below the second frame portion so as to be aligned with the first harness in the vehicle width direction.

5. The vehicle body structure according to any one of claims 1 to 4, A vehicle body structure in which a recessed portion recessed downward is formed in a portion of the floor panel corresponding to the non-battery housing portion.

6. The vehicle body structure according to any one of claims 1 to 5, a center frame disposed above and spaced apart from the floor panel in a vehicle width direction central portion of the passenger space and extending in a vehicle front-rear direction; a connecting member having an upper portion fixed to the center frame and a lower portion fixed to a portion of the floor panel corresponding to the second frame portion.

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