Vehicle understructure

Abstract

The objective is to provide a vehicle understructure that can improve the vehicle's resistance to collision loads in both side and frontal collisions, especially in vehicles equipped with batteries. [Solution] The vehicle's understructure includes an upwardly curved toe board 18 positioned in front of the foremost cross member 4A, a reinforcing member 20 that reinforces the toe board 18, and batteries 5 disposed below a plurality of cross members 4A to 4D. The rear end 20c of the reinforcing member 20 is fixed to the foremost cross member A. The foremost cross member A is fixed by bolts 14 to an intermediate frame 13 extending in the longitudinal direction of the vehicle at the battery 5.

Description

Technical Field

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[0001] The present invention relates to a lower structure of a vehicle in which a battery is mounted at the lower part of the vehicle.

Background Art

[0002] In vehicles such as electric vehicles (EVs), a structure in which a battery is disposed below the floor panel is widely known. In order to protect the battery from a collision load during a frontal collision (a collision from the front) and a side collision (a collision from the side) of the vehicle, various structures for reinforcing the floor panel have been proposed.

[0003] In the structure described in Patent Document 1, a floor tunnel is formed at the center in the vehicle width direction of the floor panel. The floor tunnel is reinforced by a reinforcing member extending in the vehicle front-rear direction.

[0004] Also, in the structure described in Patent Document 2, an inclined member extending in a direction toward the center in the vehicle width direction as it goes toward the rear of the vehicle is provided on the upper surface of the floor panel. The floor panel is reinforced by the inclined member.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, these lower vehicle structures have a problem that the strength against a collision load is low in both cases of a frontal collision (a collision from the front) and a side collision (a collision from the side) of the vehicle.

[0007] In other words, in the above-described undercarriage structure, when a collision load is applied to the toe board (a plate-shaped component that curves upward as it approaches the front of the vehicle) located in front of the floor panel during a frontal collision, the structure that receives the collision load and the resulting load-bearing capacity are insufficient. As a result, the toe board may not be able to withstand the frontal collision load, and the collision load may be transmitted to the battery.

[0008] Furthermore, in the event of a side collision, the cross members extending in the width direction of the vehicle body and other components that receive the collision load during a side collision are not sufficiently structured to withstand the impact, and therefore there is a risk that the collision load during a side collision may be transmitted to the battery. In particular, in electric vehicles without a floor tunnel, the cross members are longer, and therefore their resistance to side collision loads is insufficient. Consequently, vehicles equipped with batteries do not have sufficient resistance to collision loads.

[0009] The present invention has been made in view of the above circumstances, and aims to provide a vehicle understructure that can improve the vehicle's resistance to collision load in both side collisions and front collisions in vehicles equipped with batteries. [Means for solving the problem]

[0010] To solve the aforementioned problems, the vehicle substructure of the present invention is a vehicle substructure comprising: a plurality of cross members extending in the vehicle width direction and spaced apart from each other in the vehicle longitudinal direction; a toe board positioned in front of the foremost cross member among the plurality of cross members, having a shape that widens in the vehicle width direction and curves upward as it approaches the front of the vehicle; a reinforcing member that reinforces the toe board and is fixed in a longitudinal range including the rear end of the toe board; a battery having a battery cell and a battery housing that houses the battery cell, and a battery disposed below the plurality of cross members, wherein the rear end of the reinforcing member is fixed to the foremost cross member, and the battery has at least one intermediate frame extending in the longitudinal direction within the area occupied by the battery housing in a plan view, and the foremost cross member is fixed to the intermediate frame.

[0011] With this configuration, since the rear end of the reinforcing member that reinforces the toe board is fixed to the foremost cross member, in the event of a frontal collision, the collision load applied to the reinforcing member can be received by both the reinforcing member and the foremost cross member. Furthermore, since the foremost cross member is fixed to the battery's intermediate frame together with the reinforcing member, in the event of a side collision, the collision load applied to the foremost cross member can be received by the combination of the cross member, the reinforcing member, and the intermediate frame. As a result, the load-bearing capacity of a vehicle equipped with a battery can be improved in both side and frontal collisions. Therefore, the battery located below the cross member can be reliably protected from collision loads in this vehicle.

[0012] In the above-described understructure of the vehicle, it is preferable that the reinforcing member extends forward from the rear end of the toe board.

[0013] With this configuration, the rigidity of the reinforcing member in the longitudinal direction of the vehicle is high, thus improving the reinforcing member's resistance to collision loads during a frontal collision.

[0014] In the above-described understructure of the vehicle, it is preferable that the rear end of the reinforcing member is fixed above the front end of the foremost cross member.

[0015] With this configuration, when the reinforcing member receives a collision load during a vehicle frontal collision, the reinforcing member deforms in a direction that lifts it upwards towards the frontmost cross member, thereby reducing the load transmitted to the battery below the cross member.

[0016] In the above-described vehicle substructure, it is preferable that the fixing position between the reinforcing member and the foremost cross member is located further forward of the vehicle than the fixing position between the cross member and the intermediate frame.

[0017] With this configuration, the fixing positions of the cross member and the intermediate frame can be freely set without being affected by the fixing positions of the reinforcing members and the foremost cross member. Therefore, the fixing positions of the cross member and the intermediate frame can be set to accommodate the arrangement of components inside the vehicle (for example, foam pads for occupant protection on the floor).

[0018] Furthermore, in the event of a frontal collision, the impact load received by the reinforcing member is transmitted to the foremost cross member before being transmitted to the battery's intermediate frame, thus reducing the load transmitted to the battery's intermediate frame.

[0019] In the above-described vehicle substructure, the fixing positions of the reinforcing member and the foremost cross member may overlap with the fixing positions of the cross member and the intermediate frame in the vehicle longitudinal direction and vehicle width direction.

[0020] With this configuration, the collision load received by the reinforcing member during a frontal collision is distributed and transmitted to both the foremost cross member and the intermediate frame via a common fixing point shared by the reinforcing member, the foremost cross member, and the intermediate frame, thereby improving the overall load-bearing capacity of the vehicle during a frontal collision.

[0021] In the lower structure of the vehicle described above, it is preferable that the foremost cross member and the intermediate frame are fixed by bolt fastening.

[0022] According to such a configuration, it is possible to reliably transmit the collision load received by the foremost cross member during a vehicle frontal collision and a side collision to the intermediate frame via the bolts, and it is possible to further improve the strength of the entire vehicle during a vehicle frontal collision.

[0023] In the lower structure of the vehicle described above, it is preferable to further include a connecting member that extends in the vehicle front-rear direction and connects the foremost cross member and the second cross member from the foremost.

[0024] According to such a configuration, it is possible to transmit the collision load received by the foremost cross member during a vehicle frontal collision to the second cross member from the foremost via the connecting member, and it is possible to further improve the strength of the entire vehicle during a vehicle frontal collision.

[0025] In the lower structure of the vehicle described above, it is preferable that the connecting member is arranged at a position aligned with the reinforcing member in the vehicle front-rear direction.

[0026] According to such a configuration, it is possible to reliably transmit the collision load received by the reinforcing member during a vehicle frontal collision to the second cross member via the foremost cross member and the connecting member, and it is possible to further improve the strength of the entire vehicle during a vehicle frontal collision.

Effect of the Invention

[0027] As described above, according to the lower structure of the vehicle of the present invention, in a vehicle equipped with a battery, it is possible to improve the strength of the vehicle against a collision load in both cases of a side collision and a frontal collision of the vehicle.

Brief Description of the Drawings

[0028] [Figure 1] It is a plan view showing the overall configuration of the lower structure of a vehicle according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] This is an enlarged perspective view showing a structure in which a reinforcing member that reinforces the toe board and a connecting member behind it are fixed to the foremost cross member in Figure 1. [Figure 4] This is an enlarged plan view showing the structure in which the reinforcing member and connecting member are fixed to the foremost cross member of Figure 3. [Figure 5] This is an enlarged plan view showing a modified example in which a reinforcing member for reinforcing the toe board is fixed to the foremost cross member of Figure 1, and linear beads are formed on the toe board and the reinforcing member. [Figure 6] This is a schematic cross-sectional diagram illustrating a structure in which a reinforcing member is fixed to the foremost cross member in Figure 1 at a position forward of the bolts that secure the cross member to the intermediate frame. [Figure 7] This is a schematic cross-sectional diagram illustrating a modified example in which the reinforcing member and the intermediate frame of the battery shown in Figure 1 are bolted to the foremost cross member at the same position. [Modes for carrying out the invention]

[0029] The lower structure of a vehicle according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0030] As shown in Figures 1 to 6, the vehicle body 1 to which the vehicle substructure of this embodiment is applied comprises a pair of side sills 2 extending in the longitudinal direction X of the vehicle at both ends of the vehicle width direction Y, a plurality of (four in Figure 1) cross members 4 (4A to 4D) extending in the vehicle width direction Y and spaced apart from each other in the longitudinal direction X between the pair of side sills 2, a floor panel 3 extending below the plurality of cross members 4 into the area between the pair of side sills 2 and constituting the bottom of the vehicle body 1, a battery 5 disposed below the plurality of cross members 4 and the floor panel 3, a toe board 18 positioned forward X1 from the foremost cross member 4A, and a plurality of (two in this embodiment) reinforcing members 20 that reinforce the toe board 18.

[0031] Furthermore, the vehicle body 1 of this embodiment includes a plurality of connecting members 22 (two in this embodiment) that extend in the longitudinal direction X of the vehicle and connect the foremost cross member 4A and the second-to-last cross member 4B, and a front panel 19 that extends upward from the upper end of the toe board 18, but these are not essential components of the present invention.

[0032] The toe board 18 is positioned X1 forward of the foremost cross member 4A among the multiple cross members 4 (4A to 4D). As shown in Figure 3, the toe board 18 has a shape that widens in the vehicle width direction Y and curves upward as it approaches the front of the vehicle X1. In Figure 3, the toe board 18 extends in an arc from the front end 3a of the floor panel 3 to the front panel 19.

[0033] Two reinforcing members 20 that reinforce the toe board 18 are fixed to the toe board 18 in a range in the longitudinal direction X, including the rear end 18a. The two reinforcing members 20 are spaced apart in the vehicle width direction Y and are positioned symmetrically with respect to the midpoint of the toe board 18 in the vehicle width direction Y.

[0034] Specifically, the reinforcing member 20 has a shape that extends from the rear end 18a of the toe board 18 to the front of the vehicle X1, as shown in Figures 1 and 3-6. More specifically, the reinforcing member 20 has a main body portion 20a that curves and extends in the longitudinal direction X along the upper surface of the toe board 18, widthwise end portions 20b that curve and extend in the longitudinal direction X along both ends of the main body portion 20a in the vehicle width direction Y, and a rear end portion 20c that is continuous with the rear X2 of the main body portion 20a. In terms of overall shape, the reinforcing member 20 has the shape of a so-called ski, as shown in Figure 3.

[0035] The main body portion 20a and both ends 20b in the width direction form a hat shape. Therefore, the main body portion 20a bulges upward from the upper surface of the toe board 18, and both ends 20b in the width direction are fixed to the upper surface of the toe board 18 by spot welding or the like.

[0036] Furthermore, as shown in Figure 5, if the toe board 18 has a bead 18b (an upwardly bulging band-shaped protrusion) extending in the longitudinal direction X on its upper surface, a bead 20d extending in the longitudinal direction X may be formed between the main body portion 20a and both ends 20b in the width direction of the reinforcing member 20 to fit into the bead 18b. This improves the rigidity of the toe board 18 and the reinforcing member 20 during a vehicle frontal collision and facilitates the transmission of the collision load to the foremost cross member 4A. In addition, both ends 20b in the width direction of the reinforcing member 20 may be fixed to the toe board 18 not only by spot welding but also by bolt fastening.

[0037] As shown in Figures 4-5, the rear end 20c of the reinforcing member 20 is fixed to the foremost cross member 4A. More specifically, as shown in Figures 1 and 3-6, the rear end 20c of the reinforcing member 20 is fixed above the front end of the foremost cross member 4A by spot welding or the like. Specifically, as shown in Figure 6, the rear end 20c is spot-welded to the upper front end of the main body 4a of the hat-shaped cross member 4A, and the main body 20a (and both widthwise ends 20b) of the reinforcing member 20 overlaps with the flange 4b ​​of the cross member A. In practice, it is preferable that the main body 20a abuts against the front surface of the main body 4a of the cross member 4A from the front X1, but in Figure 6, it is shown away from the front surface of the main body 4a to facilitate understanding of the configuration of the reinforcing member 20.

[0038] In this embodiment, as shown in Figure 6, the fixing position of the reinforcing member 20 to the foremost cross member 4A (the position of the rear end 20c of the reinforcing member 20) is located on the front X1 side of the vehicle than the fixing position of the cross member 4A to the intermediate frame 13 (the position of the bolt 14, which will be described later).

[0039] Here, as shown in Figure 4, if the position of the bolt 14 is behind X2 of the rear end 20c of the reinforcing member 20 and within the range Y in the vehicle width direction of the rear end 20c and its vicinity, then the load transmitted from the reinforcing member 20 to the cross member 4A during a vehicle frontal collision can be effectively transmitted to the intermediate frame 13 of the battery 5 via the bolt 14.

[0040] As shown in Figures 1 and 3-4, the connecting member 22 extends in the longitudinal direction X of the vehicle and connects the foremost cross member 4A and the second-to-last cross member 4B. Specifically, as shown in Figure 4, the connecting member 22 has a hat-shaped main body portion 22a and both ends 22b in the width direction, and front and rear ends 22c fixed to the cross members 4A and 4B, which are spaced apart in the longitudinal direction X (note that in Figure 4, the front and rear ends 22c on the cross member 4B side are omitted). Both ends 22b in the width direction are spot-welded to the floor panel 3. The front and rear ends 22c are spot-welded to the cross members 4A and 4B, respectively. Preferably, the main body portion 22a of the connecting member 22 abuts against the surfaces of the cross members 4A and 4B that face each other in the longitudinal direction.

[0041] In this embodiment, the connecting member 22 is positioned in a location aligned with the reinforcing member 20 in the vehicle's longitudinal direction X. Therefore, the collision load received by the reinforcing member 20 during a vehicle frontal collision is easily transmitted to the second cross member 4B via the connecting member 22.

[0042] The battery 5 may have at least a battery housing 11, a battery cell 12, and an intermediate frame 13.

[0043] As shown in Figures 1 and 2, the battery 5 of this embodiment comprises a plurality of battery modules 15, a battery housing 11 that houses the plurality of battery modules 15, and at least one (three in this embodiment) intermediate frame 13, forming a single unit (battery pack). Each battery module 15 is composed of a plurality of battery cells 12. In this embodiment, the battery modules 15 are arranged in a matrix below the floor panel 3, with four modules in the vehicle width direction Y and multiple modules in the front-rear direction X.

[0044] The battery housing 11 has a rectangular frame body as shown in Figure 1, and a lid portion 16 and a bottom plate portion 17 that close the opening in the vertical direction Z as shown in Figure 2.

[0045] As shown in Figures 1 and 2, the three intermediate frames 13 extend in the front-rear direction X within the area occupied by the battery housing 11 in a plan view, and are spaced apart from each other in the vehicle width direction Y. Specifically, in this embodiment, as shown in Figure 2, the intermediate frames 13 are provided inside 11a of the battery housing 11. More specifically, the intermediate frames 13 are located below the lid portion 16 and on the upper surface of the bottom plate portion 17.

[0046] Each intermediate frame 13 is positioned between the battery modules 15 at the vehicle width direction Y shown in Figure 2. The ends of the intermediate frame 13 in the longitudinal direction X are connected to the ends of the battery housing 11 (specifically the main body consisting of a frame) in the longitudinal direction X (see Figure 1).

[0047] As shown in Figure 1, at least one of the multiple (four) cross members 4 (4A to 4D), in this embodiment three of the four cross members 4 (4A to 4D), namely the frontmost cross member 4A, the second cross member 4B, and the third cross member 4C, is connected to two of the three intermediate frames 13 at both ends in the vehicle width direction Y, specifically fastened with bolts 14 as fastening members. In other words, each of the three cross members 4A to 4C and each of the two intermediate frames 13 are fastened with bolts 14 to form a structure that creates multiple rectangular closed spaces, i.e., a grid structure. Note that bolts 14 are a broad concept of fastening members and also include parts called screws.

[0048] As shown in Figures 1-4, it is sufficient that at least the foremost cross member 4A of the four cross members 4 (4A-4D) is fixed to the intermediate frame 13 by fastening with bolts 14.

[0049] In this embodiment, as shown in Figure 2, the bolt 14 penetrates the cross member 4, the floor panel 3, and the lid 16 to reach the interior 11a of the battery housing 11 and is fastened to the cross member 4 via the inner collar 21. The through hole for the bolt 14 in the lid 16 of the battery 5 and its surrounding area are prevented from flowing liquid by a watertight structure including the inner collar 21, the outer collar 23, and a packing (not shown).

[0050] The intermediate frame 13 of the battery 5 may be located on the upper side of the lid 16.

[0051] The connection between the cross member 4 and the intermediate frame 13 may be made not only by fastening with bolts 14 as described above, but also by other means, such as fastening with blind rivets.

[0052] (Features of this embodiment) (1) As shown in Figures 1 to 6, the vehicle body 1 equipped with the vehicle's understructure comprises a plurality of cross members 4 (4A to 4D), a toe board 18 positioned X1 forward of the foremost cross member 4A and having a shape that widens in the vehicle width direction Y and curves upward as it approaches the front of the vehicle X1, a reinforcing member 20 that reinforces the toe board 18 and is fixed in the range X in the longitudinal direction including the rear end 18a of the toe board 18, and a battery 5 disposed below the plurality of cross members 4 (4A to 4D).

[0053] In the vehicle body 1 described above, as shown in Figures 4-5, the rear end 20c of the reinforcing member 20 is fixed to the foremost cross member 4A. Also, as shown in Figures 1-2, the battery 5 has at least one intermediate frame 13 that extends in the front-rear direction X within the area occupied by the battery housing 11 in a plan view. As shown in Figures 1-4, the foremost cross member 4A is fixed to the intermediate frame 13 of the battery 5 by bolts 14 or the like.

[0054] With this configuration, since the rear end 20c of the reinforcing member 20 that reinforces the toe board 18 is fixed to the foremost cross member 4A, the collision load LX (see Figure 1) input to the reinforcing member 20 during a frontal collision can be received by both the reinforcing member 20 and the foremost cross member 4A. Furthermore, since the foremost cross member 4A is fixed to the intermediate frame 13 of the battery 5 together with the reinforcing member 20, the collision load LY (see Figure 1) input to the foremost cross member 4A during a side collision can be received by the combination of the cross member 4A, the reinforcing member 20, and the intermediate frame 13. As a result, the load-bearing capacity of the vehicle equipped with the battery 5 can be improved in both side collisions and frontal collisions. Therefore, the battery 5 below the cross member 4 can be reliably protected from collision loads in this vehicle.

[0055] (2) In the vehicle understructure of this embodiment, as shown in Figures 1, 3 to 6, the reinforcing member 20 extends from the rear end 18a of the toe board 18 to the front X1 of the vehicle.

[0056] In this configuration, the rigidity of the reinforcing member 20 in the longitudinal direction X of the vehicle is high, so the load-bearing capacity of the reinforcing member 20 against collision loads during a frontal collision of the vehicle is improved.

[0057] (3) In the vehicle understructure of this embodiment, as shown in Figures 1, 3-6, the rear end portion 20c of the reinforcing member 20 is fixed above the front end portion of the foremost cross member 4A.

[0058] In this configuration, as shown in Figure 6, when the reinforcing member 20 receives a collision load LX during a vehicle frontal collision, the reinforcing member 20 deforms in a direction that lifts it upwards towards the frontmost cross member 4A, thereby reducing the load transmitted to the battery 5 below the cross member.

[0059] (4) In the vehicle substructure of this embodiment, as shown in Figures 4 to 6, the fixing position of the reinforcing member 20 to the foremost cross member 4A (the position of the rear end 20c of the reinforcing member 20) is located on the X1 side of the vehicle forward than the fixing position of the cross member 4A to the intermediate frame 13 (the position of the bolt 14).

[0060] With this configuration, the fixing position of the cross member and the intermediate frame 13 (the position of the rear end 20c of the reinforcing member 20) can be freely set without being affected by the fixing position of the reinforcing member 20 and the foremost cross member 4A (the position of the bolt 14). Therefore, the fixing position of the cross member and the intermediate frame 13 (the position of the bolt 14) can be set to suit the arrangement of components inside the vehicle (for example, foam pads for occupant protection on the floor).

[0061] Furthermore, in the event of a frontal collision, the impact load received by the reinforcing member 20 is transmitted to the foremost cross member 4A before being transmitted to the intermediate frame 13 of the battery 5, thus making it possible to reduce the load transmitted to the intermediate frame 13 of the battery 5.

[0062] Furthermore, as shown in Figure 6, when subjected to the collision load LX during a frontal impact, the toe board 18 and reinforcing member 20 deform to be lifted above the foremost cross member 4A, thereby reducing the load transmitted to the battery 5 via the cross member 4A and bolts 14.

[0063] (5) In the vehicle's understructure according to this embodiment, as shown in Figures 1-6, the foremost cross member 4A and the intermediate frame 13 are fixed together by fastening bolts 14.

[0064] With this configuration, the collision load received by the foremost cross member 4A during a frontal or side collision can be reliably transmitted to the intermediate frame 13 via bolts, thereby further improving the overall load-bearing capacity of the vehicle during a frontal collision.

[0065] (6) As shown in Figures 1, 3, and 4, the understructure of the vehicle in this embodiment further includes a connecting member 22 that extends in the longitudinal direction X of the vehicle and connects the foremost cross member 4A and the second-to-last cross member 4B. In this configuration, it is preferable that the fastening positions (by bolts, etc.) of the connecting member 22 and the fastening positions (by bolts, etc.) of the reinforcing member 20 (so-called skis) coincide with the longitudinal direction X of the vehicle.

[0066] With this configuration, the collision load received by the foremost cross member 4A during a vehicle frontal collision can be transmitted to the second-to-last cross member 4B via the connecting member 22, thereby further improving the overall load-bearing capacity of the vehicle during a vehicle frontal collision.

[0067] (7) In the vehicle substructure of this embodiment, as shown in Figures 3-4, the connecting member 22 is positioned in a location aligned with the reinforcing member 20 in the vehicle's longitudinal direction X.

[0068] With this configuration, the collision load received by the reinforcing member 20 during a vehicle frontal collision can be reliably transmitted to the second cross member 4B via the foremost cross member 4A and the connecting member 22, thereby further improving the overall load-bearing capacity of the vehicle during a vehicle frontal collision.

[0069] (modified version) (A) In the above embodiment, as shown in Figure 6, the fixing position of the reinforcing member 20 to the foremost cross member 4A (position of the rear end 20c of the reinforcing member 20) is located on the front X1 side of the vehicle than the fixing position of the cross member 4A to the intermediate frame 13 (position of the bolt 14), but the present invention is not limited thereto.

[0070] As a modified example of the present invention, as shown in Figure 7, the fixing position of the reinforcing member 20 and the foremost cross member 4A may overlap with the fixing position (position of the bolt 14) of the cross member 4A and the intermediate frame 13 in the vehicle longitudinal direction X and the vehicle width direction Y. For example, as shown in Figure 7, the bolt 14 can fasten the reinforcing member 20 (specifically the main body portion 20a), the front flange portion 4b of the cross member 4A, and the intermediate frame 13b (via the inner collar 21).

[0071] With the modified configuration shown in Figure 7, the collision load received by the reinforcing member 20 during a vehicle frontal collision is distributed and transmitted to both the foremost cross member 4A and the intermediate frame 13 via a common fixing point (position of bolt 14) of the reinforcing member 20, the foremost cross member 4A, and the intermediate frame 13, thereby improving the overall load-bearing capacity of the vehicle during a vehicle frontal collision.

[0072] Furthermore, in the modified example shown in Figure 7, when subjected to a collision load LX during a frontal impact, the toe board 18 and reinforcing member 20 deform to be lifted above the foremost cross member 4A, thereby reducing the load transmitted to the battery 5 via the cross member 4A and bolts 14.

[0073] (B) In the above embodiment, the connecting member 22 that connects the foremost cross member 4A and the second cross member 4B is positioned in a location aligned with the reinforcing member 20 in the vehicle longitudinal direction X, but the present invention is not limited thereto. There only needs to be at least one connecting member 22, and it may be positioned at an intermediate position in the vehicle width direction Y of the foremost cross member 4A, or there may be more connecting members 22 than the two reinforcing members 20. [Explanation of Symbols]

[0074] 1. Vehicle body 2 Side sills 3 Floor Panels 4 Cross Members 5 batteries 11 Battery housing 12 battery cells 13 Intermediate Frames 14 volts 15 Battery Modules 18 Toeboard 20 Reinforcement members 22 Connecting member

Claims

1. The understructure of the vehicle, The vehicle comprises a plurality of cross members that extend in the width direction and are spaced apart from each other in the longitudinal direction of the vehicle, A toe board is positioned in front of the foremost of the aforementioned multiple cross members, and has a shape that widens in the vehicle width direction and curves upward as it approaches the front of the vehicle, A reinforcing member that reinforces the toe board is fixed in a range in the front-rear direction including the rear end of the toe board, A battery comprising a battery cell and a battery housing that houses the battery cell, and disposed below the plurality of cross members, Equipped with, The rear end of the reinforcing member is fixed to the foremost cross member. The battery has at least one intermediate frame that extends in the front-to-back direction within the area occupied by the battery housing in a plan view, The aforementioned foremost cross member is fixed to the intermediate frame. A vehicle understructure characterized by the following:

2. In the vehicle substructure according to claim 1, The reinforcing member extends from the rear end of the toe board toward the front of the vehicle. A vehicle understructure characterized by the following:

3. In the vehicle substructure according to claim 1, The rear end of the reinforcing member is fixed above the front end of the foremost cross member. A vehicle understructure characterized by the following:

4. In the vehicle substructure according to claim 1, The fixing position between the reinforcing member and the foremost cross member is located further forward of the vehicle than the fixing position between the cross member and the intermediate frame. A vehicle understructure characterized by the following:

5. In the vehicle substructure according to claim 1, The fixing positions of the reinforcing member and the foremost cross member overlap with the fixing positions of the cross member and the intermediate frame in the vehicle's longitudinal and vehicle width directions. A vehicle understructure characterized by the following:

6. In the vehicle substructure described in claim 1, The aforementioned foremost cross member and the aforementioned intermediate frame are fixed together by bolts. A vehicle understructure characterized by the following:

7. In the vehicle substructure according to any one of claims 1 to 6, It further includes a connecting member that extends in the longitudinal direction of the vehicle and connects the foremost cross member and the second cross member from the front. A vehicle understructure characterized by the following:

8. In the vehicle substructure according to claim 7, The connecting member is positioned in a location aligned with the reinforcing member in the longitudinal direction of the vehicle. A vehicle understructure characterized by the following:

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