Vehicle under structure

Abstract

A vehicle lower structure includes a pair of side members, an extension member, an electricity storage device, and a supported member. The extension member extends from at least one of the pair of side members between the pair of side members. The power storage device is fixed to the pair of side members. The power storage device is disposed below the extension member. The supported member is fixed to the upper portion of the electricity storage device and is supported by the extension member. The power storage device includes a fixed portion. The fixed portion is suppressed in downward displacement by fixing the supported member. The supported member is configured so that the fixed portion can be displaced upward.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a vehicle lower structure. BACKGROUND

[0002] In Japanese Patent Application Publication No. 2020-142589, a battery pack is provided on a lower side of a floor panel.

[0003] In a vehicle lower structure, a power storage device is sometimes fixed to a member located above the power storage device. Thereby, the power storage device can be inhibited from being deformed in a manner of being deflected downward due to its weight. However, the power storage device is inhibited from being deflected upward due to the above-described member. Thereby, for example, a stress generated in the power storage device due to vibration at the time of running of a vehicle provided with the vehicle lower structure can be inhibited from being released by deflection. In this way, the durability of the power storage device in the conventional vehicle lower structure is low. SUMMARY

[0004] The present disclosure was achieved in view of the above-described problems, and an object thereof is to provide a vehicle lower structure capable of improving the durability of a power storage device in the vehicle lower structure.

[0005] A vehicle lower structure according to an aspect of the present disclosure includes a pair of side frames, an extension member, a power storage device, and a supported member. The extension member extends from at least one of the pair of side frames between the pair of side frames. The power storage device is fixed to the pair of side frames. The power storage device is disposed below the extension member. The supported member is fixed to an upper portion of the power storage device and is supported by the extension member. The power storage device includes a fixed portion. The fixed portion is inhibited from being displaced downward by the supported member being fixed thereto. The supported member is configured to allow the fixed portion to be displaced upward.

[0006] In the vehicle lower structure according to an aspect of the present disclosure, it is preferable that the supported member include a column portion and a cantilever beam portion. The column portion extends upward from the fixed portion. The cantilever beam portion extends from the column portion in a substantially horizontal direction. The cantilever beam portion is supported by the extension member from below.

[0007] In the vehicle lower structure according to an aspect of the present disclosure, it is preferable that the supported member further include a buffer member disposed between the cantilever beam portion and the extension member.

[0008] In the vehicle lower structure according to an aspect of the present disclosure, it is preferable that the extension member be a cross member extending from a side frame of one of the pair of side frames to a side frame of the other of the pair of side frames.

[0009] In the vehicle lower structure according to an aspect of the present disclosure, it is preferable that the extension member extend from a side frame of one of the pair of side frames and be separated from a side frame of the other of the pair of side frames. The column portion and the extension member are arranged in a vehicle width direction. The cantilever beam portion extends along an upper surface of the extension member.

[0010] In the vehicle lower structure of one aspect of the present disclosure, it is preferable that the supported member has an extension portion. The extension portion is configured so that its length can be changed. The fixed portion is suspended from the extension member by the supported member.

[0011] In the vehicle lower structure of one aspect of the present disclosure, it is preferable that the supported member is configured by an elastic member. The supported member is sandwiched between the fixed portion and the extension member in the up-down direction.

[0012] The above and other objects, features, aspects and advantages of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, when properly considered together. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a side view showing a vehicle provided with the vehicle lower structure of Embodiment 1.

[0014] Figure 2 is an exploded perspective view showing the vehicle lower structure of Embodiment 1.

[0015] Figure 3 is a cross-sectional view when the vehicle lower structure of Embodiment 1 is viewed from the front side.

[0016] Figure 4 is a cross-sectional view when the vehicle lower structure of Figure 3 is viewed from the IV-IV line arrow direction.

[0017] Figure 5 is a view showing a part of Figure 4 enlarged.

[0018] Figure 6 is a cross-sectional view showing a state in which the electric storage device is deformed in a manner of being flexed toward the upper side in the vehicle lower structure of Embodiment 1.

[0019] Figure 7 is a partial cross-sectional view showing a vehicle lower structure of a modification example of Embodiment 1.

[0020] Figure 8 is a cross-sectional view when the vehicle lower structure of Embodiment 2 is viewed from the front side.

[0021] Figure 9 is a cross-sectional view showing a state in which the electric storage device is deformed in a manner of being flexed toward the upper side in the vehicle lower structure of Embodiment 2.

[0022] Figure 10 is a partial cross-sectional view showing a vehicle lower structure of a modification example of Embodiment 2.

[0023] Figure 11is a partial cross-sectional view of a vehicle lower structure of another modification of Embodiment 2.

[0024] Figure 12 is a cross-sectional view of a part of the vehicle lower structure when viewed from the arrow direction of XII-XII line. Figure 11

[0025] Figure 13 is a cross-sectional view of the vehicle lower structure of Embodiment 3.

[0026] Figure 14 is a cross-sectional view of a state in which the electric storage device is deformed in a manner of being flexed toward the upward direction in the vehicle lower structure of Embodiment 3.

[0027] Figure 15 is a cross-sectional view of the vehicle lower structure of Embodiment 4.

[0028] Figure 16 is a cross-sectional view of a state in which the electric storage device is deformed in a manner of being flexed toward the upward direction in the vehicle lower structure of Embodiment 4. DETAILED DESCRIPTION

[0029] Hereinafter, the vehicle lower structure of each embodiment of the present disclosure will be described with reference to the drawings. The same reference numerals are assigned to the same or equivalent portions in the drawings, and the description thereof will not be repeated.

[0030] In addition, the arrows F, B, U, D, L, R in the drawings used in the following description represent directions based on the vehicle, the arrow F represents the "front direction", the arrow B represents the "rear direction", the arrow U represents the "upward direction", the arrow D represents the "downward direction", the arrow L represents the "left direction", and the arrow R represents the "right direction".

[0031] (Embodiment 1)

[0032] Figure 1 is a side view of a vehicle provided with the vehicle lower structure of Embodiment 1. The vehicle 1000 provided with the vehicle lower structure 1 of Embodiment 1 is, for example, an electric vehicle such as a motor vehicle or a hybrid vehicle, which can be driven by a motor. The vehicle 1000 is provided with a vehicle cabin 2. The vehicle cabin 2 is located above the vehicle lower structure 1.

[0033] Figure 2 is an exploded perspective view of the vehicle lower structure of Embodiment 1. Figure 3 is a cross-sectional view when the vehicle lower structure of Embodiment 1 is viewed from the front side. Figure 4 is a cross-sectional view of the vehicle lower structure when viewed from the arrow direction of IV-IV line. Figure 3 In addition, the cross-sectional view when viewed from the arrow direction of III-III line in Figure 4 corresponds to​Figure 3 a cross-sectional view.

[0034] As shown in Figures 2 to 4 , the vehicle lower structure 1 is provided with a lower frame 10, an electrical storage device 20, and a supported member 30.

[0035] First, the lower frame 10 will be described. The lower frame 10 includes a pair of side frames 11, one or more cross members 12, a front beam 13, and a rear beam 14.

[0036] The pair of side frames 11 extend in the vehicle front-rear direction. The pair of side frames 11 are respectively located on both sides of the center of the vehicle lower structure 1 in the vehicle width direction. The pair of side frames 11 include a left side frame 11L and a right side frame 11R. The left side frame 11L is located at a position on the left side of the center of the vehicle lower structure 1 in the vehicle width direction. The right side frame 11R is located at a position on the right side of the center of the vehicle lower structure 1 in the vehicle width direction.

[0037] The one or more cross members 12 each extend from the side frame 11 of one of the pair of side frames 11 to the side frame 11 of the other. The one or more cross members 12 each extend in a direction orthogonal to the direction in which the pair of side frames 11 extend. Specifically, the one or more cross members 12 each extend along the vehicle width direction. In the present embodiment, the lower frame 10 includes a plurality of cross members 12. The plurality of cross members 12 are separated from each other in the vehicle front-rear direction.

[0038] The front beam 13 extends in the vehicle width direction. The front beam 13 is located at a position forward of the plurality of cross members 12. The front beam 13 connects the front portions of the pair of side frames 11 to each other.

[0039] The rear beam 14 extends in the vehicle width direction. The rear beam 14 is located at a position rearward of the plurality of cross members 12. The rear beam 14 connects the rear portions of the pair of side frames 11 to each other.

[0040] Furthermore, the lower frame 10 includes a plurality of extension members 15. In the present embodiment, the lower frame 10 includes the cross members 12 as the extension members 15. However, the extension members 15 can also be included as members separate from the cross members 12. In this case, the extension members 15 only need to be configured to extend from at least one of the pair of side frames 11 between the pair of side frames 11.

[0041] In the present embodiment, the configuration described as having the cross members 12 can also have the extension members 15. Also, in the present embodiment, the configuration of the extension members 15 described below can have the cross members 12.

[0042] In the present embodiment, the plurality of extension members 15 can have mutually identical configurations. Therefore, the detailed configuration of the extension members 15 will be described with one extension member 15 in mind. Figure 5 is toFigure 4 A portion of the image is shown in magnification. (See image below.) Figure 5 As shown, the extension member 15 has a top plate portion 151, a plurality of wall portions 152 and a plurality of protrusions 153.

[0043] The top plate portion 151 extends in a generally horizontal direction. A plurality of wall portions 152 extend downward from the top plate portion 151. One of the plurality of wall portions 152 extends from the front of the top plate portion 151. One of the plurality of wall portions 152 extends from the rear of the top plate portion 151.

[0044] Multiple protrusions 153 extend from the lower ends of multiple wall portions 152 in either the front-rear direction of the vehicle. For example, one protrusion 153 extends further forward from the wall portion 152 extending from the front of the top plate portion 151. Other protrusions 153 extend further rearward from the wall portion 152 extending from the rear of the top plate portion 151.

[0045] Next, the energy storage device 20 will be described. The energy storage device 20 is fixed to a pair of longitudinal beams 11 (see reference). Figure 3 The energy storage device 20 is also fixed to the front beam 13 and the rear beam 14 (see reference). Figure 4 The energy storage device 20 is not directly fixed to the extension member 15.

[0046] The energy storage device 20 is located below the extension member 15. The energy storage device 20 is located below the front beam 13 and the rear beam 14.

[0047] like Figure 3 As shown, the energy storage device 20 includes an energy storage module 21 and a housing 22. The energy storage module 21 includes a plurality of energy storage units 211 housed in the housing 22 and arranged in a generally horizontal direction. The energy storage units 211 are configured as batteries that store electricity supplied to the motor. The plurality of energy storage units 211 may be stacked in the vehicle width direction or in the vehicle front-rear direction.

[0048] The housing 22 has an upper plate 221, an adhesive 222, side walls 223, an inner wall 224, a support plate 225, and a bottom plate 226. The upper plate 221, the pair of side walls 223, and the bottom plate 226 are, for example, made of FRP. These components constitute the outer contour structure of the housing 22. The adhesive 222, the inner wall 224, the support plate 225, and the energy storage module 21 are disposed in this outer contour structure.

[0049] The energy storage module 21 (each of the plurality of energy storage units 211) is bonded to the upper plate 221 via an adhesive 222. Inner walls 224 are respectively disposed on both outer sides of the energy storage module 21 (the plurality of energy storage units 211) in the stacking direction. A support plate 225, having a plate-like shape, is disposed between the energy storage module 21 and the bottom plate 226. The inner walls 224 are integrated with the upper plate 221 by fasteners 61 and with the bottom plate 226 by fasteners 62. Furthermore, a surface pressure dispersion plate may be disposed between the energy storage module 21 and the upper plate 221 to disperse the load from above the upper plate 221 in a generally horizontal direction.

[0050] The energy storage device 20, configured as described above, is securely connected to a pair of longitudinal beams 11 in the lower frame 10 via multiple fastening connectors 63. Thus, the energy storage device 20 is fixed to the pair of longitudinal beams 11. Alternatively, seals 51 and 52 (see reference) may be provided between the energy storage device 20 (upper plate 221) and the lower frame 10 (front beam 13 and rear beam 14). Figure 4 ).

[0051] like Figure 5 As shown, the energy storage device 20 includes multiple fixed portions 25. Each fixed portion 25 is a part to which a supported member 30 is fixed. The fixed portions 25 need only be located on the upper part of the energy storage device 20, and the specific components constituting the fixed portions 25 are not particularly limited. In this embodiment, the fixed portions 25 are part of the upper plate 221 of the housing 22.

[0052] Furthermore, the fixing part 25 may also be the upper part of the energy storage module 21. When the fixing part 25 is the upper part of the energy storage module 21, an opening may also be formed in the upper plate 221 located above the fixing part 25. When other components such as a surface pressure dispersion plate are arranged between the upper plate 221 and the energy storage module 21, the fixing part 25 may also be such other components.

[0053] Next, the multiple supported members 30 will be described. Hereinafter, one supported member 30 will be described. The multiple supported members 30 can all have the configuration described below.

[0054] like Figure 5 As shown, the supported member 30 is fixed to the upper part of the energy storage device 20. In addition, the supported member 30 is supported by the extension member 15.

[0055] Specifically, the supported member 30 is fixed to the fixed portion 25 of the energy storage device 20. In this embodiment, the supported member 30 is fixed to the upper plate 221. The supported member 30 and the fixed portion 25 are fixedly connected to each other by a fixing member 71. The fixing member 71 is a fastening connector, but it can also be an adhesive member.

[0056] The supported member 30 is located outside in the substantially horizontal direction of the extending member 15. In the present embodiment, the supported member 30 is located on the front side or the rear side of the extending member 15.

[0057] The supported member 30 has a column portion 31 and a cantilever beam portion 32. The column portion 31 extends upward from the fixed portion 25. The column portion 31 includes a root portion 311 and a main body portion 312 extending upward from the root portion 311. The root portion 311 extends in the substantially horizontal direction. The root portion 311 is continuous with the fixed portion 25. The fixed member 71 is connected to the root portion 311. The main body portion 312 can have a rod shape or a plate shape.

[0058] The cantilever beam portion 32 extends from the column portion 31 in the substantially horizontal direction. The cantilever beam portion 32 extends from the upper end of the main body portion 312 of the column portion 31 in the substantially horizontal direction.

[0059] The cantilever beam portion 32 is supported from below by the protruding portion 153 of the extending member 15. The cantilever beam portion 32 is not bonded to the extending member 15. In the case where the cantilever beam portion 32 extends toward the rear, the cantilever beam portion 32 is supported from below by the protruding portion 153 protruding toward the front. In the case where the cantilever beam portion 32 extends toward the front, the cantilever beam portion 32 is supported from below by the protruding portion 153 protruding toward the rear.

[0060] The material constituting the supported member 30 is not particularly limited. The supported member 30 can be constituted by a metal, for example. The supported member 30 can also be constituted by a resin member. The supported member 30 can also be constituted by FRP.

[0061] The vehicle lower structure 1 can also have one or more intermediate members 40. The intermediate member 40 is disposed below the floor carpet 2F constituting a part of the passenger compartment 2 (see FIG. 1) (refer to Figure 2 and Figure 3 The one or more intermediate members 40 are disposed so as to fill each space partitioned by the pair of side sills 11, the one or more cross members 12 (extending members 15), the front beam 13, and the rear beam 14. The intermediate member 40 can be constituted by a member that is lighter in weight and softer than a metal. The intermediate member 40 is constituted by a member containing a foamed resin, for example. The intermediate member 40 can be continuous with the supported member 30, but can also be separate from the supported member 30.

[0062] Here, the function of the supported member 30 will be described. With the supported member 30 configured as described above, the fixed portion 25 is inhibited from displacement downward. Specifically, with the cantilever beam portion 32 engaged with the projecting portion 153 of the extension member 15 located on the lower side thereof, the fixed portion 25 fixed to the supported member 30 is inhibited from displacement downward. On the other hand, however, the supported member 30 is configured so that the fixed portion 25 can be displaced upward. Thus, the electric storage device 20 can be deformed in a manner of flexing upward.

[0063] The deformation will be described in more detail. Figure 6 is a cross-sectional view showing a state in which the electric storage device is deformed in a manner of flexing upward in the vehicle lower structure of Embodiment 1. In Figure 6 , a portion corresponding to the portion shown in the cross-sectional view of Figure 5 is shown.

[0064] As shown in Figure 5 and Figure 6 , for example, when stress acts on the electric storage device 20 due to vibration and the like generated when the vehicle 1000 is running, the fixed portion 25 (the upper plate 221) tends to deform upward. At this time, the supported member 30 (the cantilever beam portion 32) is displaced upward in a manner of moving away from the extension member 15 (the projecting portion 153). As a result, the electric storage device 20 can be deformed in a manner of flexing upward.

[0065] As described above, the vehicle lower structure 1 is provided with the pair of side frames 11, the extension member 15, the electric storage device 20, and the supported member 30. The extension member 15 extends from at least one of the pair of side frames 11 between the pair of side frames 11. The electric storage device 20 is fixed to the pair of side frames 11. The electric storage device 20 is disposed below the extension member 15. The supported member 30 is fixed to the upper portion of the electric storage device 20 and is supported by the extension member 15. The electric storage device 20 includes the fixed portion 25. The fixed portion 25 is inhibited from displacement downward by the supported member 30 being fixed thereto. The supported member 30 is configured so that the fixed portion 25 can be displaced upward.

[0066] According to the above-described configuration, the electric storage device 20 can be inhibited from being deformed in a manner of flexing downward due to its weight by the supported member 30. On the other hand, the supported member 30 can allow the electric storage device 20 to be deformed in a manner of flexing upward when the vehicle 1000 provided with the vehicle lower structure 1 is running and the like. Thus, the durability of the electric storage device 20 in the vehicle lower structure 1 can be improved.

[0067] Further, in the vehicle lower structure 1 of the present embodiment, the supported member 30 has a column portion 31 and a cantilever beam portion 32. The column portion 31 extends upward from the fixed portion 25. The cantilever beam portion 32 extends from the column portion 31 in a substantially horizontal direction. The cantilever beam portion 32 is supported from below by the extension member 15.

[0068] According to the above-described configuration, when the fixed portion 25 is displaced upward, the cantilever beam portion 32 extending from the column portion 31 is able to be displaced upward in a manner to move away from the extension member 15. Further, regardless of the material of the supported member 30, the supported member 30 is able to allow the electric storage device 20 to be deformed in a manner to flex upward.

[0069] Further, in the vehicle lower structure 1 of the present embodiment, the extension member 15 is a cross member 12 that extends from one of the pair of longitudinal members 11 to the other longitudinal member 11.

[0070] According to the above-described configuration, it is possible to improve the rigidity of the vehicle lower structure 1 by the cross member 12, and it is possible to further suppress the electric storage device 20 from being deformed in a manner to flex downward due to its weight by supporting the supported member 30 by the strong cross member 12.

[0071] Further, the supported member 30 and the extension member 15 can not directly contact each other. Figure 7 is a partial cross-sectional view that shows a vehicle lower structure of a modification example of Embodiment 1. In Figure 7 , a portion that corresponds to the portion shown in the cross-sectional view of Figure 5 in Embodiment 1 is shown.

[0072] As shown in Figure 7 , the supported member 30 can also have a buffer member 35x that is disposed between the cantilever beam portion 32 and the extension member 15.

[0073] After the cantilever beam portion 32 is displaced upward in a manner to move away from the extension member 15, the cantilever beam portion 32 is displaced downward and returns to the state of being supported by the extension member 15 again. At this time, according to the above-described configuration, it is possible to reduce the load that the extension member 15 receives from the cantilever beam portion 32 by the buffer member 35x.

[0074] Specifically, the buffer member 35x is disposed between the cantilever beam portion 32 and the protruding portion 153. The buffer member 35x is composed of a member that is softer than the cantilever beam portion 32 and the protruding portion 153. The buffer member 35x can be composed of, for example, a rubber-like member or a foamed resin.

[0075] (Embodiment 2)

[0076] Next, the vehicle lower structure of Embodiment 2 of the present disclosure will be described. The vehicle lower structure of Embodiment 2 of the present disclosure is mainly different from the vehicle lower structure 1 of Embodiment 1 of the present disclosure in that the extension member is not a cross member. Further, for the same configuration as the vehicle lower structure 1 of Embodiment 1 and its effects, the description will not be repeated.

[0077] Figure 8 is a cross-sectional view of the case where the vehicle lower structure of Embodiment 2 is viewed from the front side. In Figure 8 , a portion corresponding to the portion shown by the cross-sectional view of Figure 3 is shown.

[0078] As shown in Figure 8 , in the vehicle lower structure 1A of Embodiment 2, the extension member 15A extends from the one side of the pair of longitudinal members 11 and is separated from the other side of the longitudinal members 11. The column portion 31A is arranged in the vehicle width direction with the extension member 15A. The cantilever beam portion 32A extends along the upper surface of the extension member 15A.

[0079] According to the above-described configuration, the supported member 30A can be supported by the extension member 15A regardless of whether the vehicle lower structure 1A is provided with the cross member 12.

[0080] The extension member 15A is fixed to the longitudinal member 11 by the fastening link 73. However, the extension member 15A can also be configured integrally with the member configuring the longitudinal member 11. For example, the extension member 15A can also be a flange portion 111 protruding inward in the vehicle width direction in the longitudinal member 11. Further, in the present embodiment, the extension member 15A is located above the flange portion 111.

[0081] Figure 9 is a cross-sectional view showing a state in which the electric storage device is deformed in a manner of being flexed upward in the vehicle lower structure of Embodiment 2. In Figure 9 , a portion corresponding to a portion of the portion shown by the cross-sectional view of Figure 8 is shown.

[0082] As shown in Figure 8 and Figure 9 , in Embodiment 2, when stress acts on the electric storage device 20, the fixed portion 25 (the upper plate 221) also attempts to be deformed upward. At this time, the supported member 30A (the cantilever beam portion 32A) is displaced upward in a manner of moving away from the extension member 15A. As a result, the electric storage device 20 can be deformed in a manner of being flexed upward.

[0083] That is, in Embodiment 2, the fixed portion 25 is also suppressed from being displaced downward by the supported member 30A being fixed thereto. The supported member 30A is configured so that the fixed portion 25 can be displaced upward.

[0084] In addition, in Embodiment 2, the supported member 30A and the extension member 15A can not be directly connected. Figure 10 is a partial cross-sectional view of a vehicle lower structure of a modification of Embodiment 2. In Figure 10 , a portion corresponding to a portion of the cross-sectional view shown in Figure 8 of Embodiment 2 is shown.

[0085] As shown in Figure 10 , the supported member 30A can further have a buffer member 35x disposed between the cantilever beam portion 32A and the extension member 15A.

[0086] Further, the supported member 30A is not limited to the above-described configuration. Figure 11 is a partial cross-sectional view of a vehicle lower structure of another modification of Embodiment 2. In Figure 11 , a portion corresponding to a portion of the cross-sectional view shown in Figure 8 of Embodiment 2 is shown. Figure 12 is a cross-sectional view when a portion of the vehicle lower structure of Embodiment 2 is viewed from the XII-XII arrow direction. Figure 11

[0087] As shown in Figure 11 and Figure 12 , the supported member 30A can further have a cover wall portion 33yA and a cover bottom portion 34yA. The cover wall portion 33yA extends downward from the cantilever beam portion 32A. The cover wall portion 33yA covers a portion of at least one side of the front and the rear of the extension member 15A. The cover bottom portion 34yA extends from the cover wall portion 33yA in a substantially horizontal direction. The cover bottom portion 34yA covers a portion of the lower side of the extension member 15A.

[0088] (Embodiment 3)

[0089] Next, a vehicle lower structure of Embodiment 3 of the present disclosure will be described. The vehicle lower structure of Embodiment 3 of the present disclosure is mainly different from the vehicle lower structure 1 of Embodiment 1 of the present disclosure in the configuration of the supported member. Further, for the same configuration as the vehicle lower structure 1 of Embodiment 1 and the effects thereof, the description will not be repeated.

[0090] Figure 13 is a cross-sectional view of a vehicle lower structure of Embodiment 3. In Figure 13 , a portion corresponding to a portion shown in Figure 5 of Embodiment 1 is shown. Figure 14 is a cross-sectional view showing a state in which the electric power storage device is deformed in a manner of being flexed toward the upper side in the vehicle lower structure of Embodiment 3. In Figure 14 , a portion corresponding to a portion shown in the cross-sectional view of Embodiment 1 is shown.​Figure 13 the cross-sectional view shown in FIG. 1A.

[0091] As shown in FIG. 1A, in the vehicle lower structure 1 of Embodiment 1, the supported member 30 has the telescopic portion 36. The telescopic portion 36 is configured so that its length can be changed. The fixed portion 25 is suspended from the extension member 15 by the supported member 30. Figure 13

[0092] According to the above-described configuration, as shown in FIG. 1A, by contraction of the telescopic portion 36 of the supported member 30, the supported member 30 can allow the electric power storage device 20 to be deformed in a manner of flexing toward the upper side. That is, in Embodiment 1, the fixed portion 25 is also suppressed from displacement toward the lower side by being fixed with the supported member 30. Specifically, the fixed portion 25 is suppressed from displacement toward the lower side by being suspended by the telescopic portion 36 that has been elongated to a predetermined length. Also, the supported member 30 is configured so that the fixed portion 25 can be displaced toward the upper side. Figure 14

[0093] The telescopic portion 36 can also be configured to be able to be telescoped by being composed of a member of a rubber-like material. Alternatively, the telescopic portion 36 can also be configured to be able to be telescoped by being composed of a rail member and a slider member that slides on the rail member.

[0094] The supported member 30 also has a pair of engaging portions 37. The pair of engaging portions 37 are located at both ends of the telescopic portion 36. The pair of engaging portions 37 respectively engage with the fixed portion 25 (the upper plate 221) and the extension member 15 (the protruding portion 153). It can also be that, in the fixed portion 25 (the upper plate 221) and the extension member 15 (the protruding portion 153), for example, hole portions (not shown) for engagement of the engaging portions 37 are formed.

[0095] (Embodiment 4)

[0096] Finally, the vehicle lower structure of Embodiment 4 of the present disclosure will be described. The vehicle lower structure of Embodiment 4 of the present disclosure is mainly different from the vehicle lower structure 1 of Embodiment 1 in the configuration of the supported member. Further, for the same configuration as the vehicle lower structure 1 of Embodiment 1 and its effects, the description will not be repeated.

[0097] Figure 15 is a cross-sectional view that shows the vehicle lower structure of Embodiment 4. In Figure 15 , a portion that corresponds to the portion shown by Figure 5 in Embodiment 1 is shown. Figure 16 is a cross-sectional view that shows a state in which the electric power storage device is deformed in a manner of flexing toward the upper side in the vehicle lower structure of Embodiment 4. In Figure 16 , a portion that corresponds to the portion shown by​​Figure 15 the cross-sectional view.

[0098] As Figure 15 shown in FIG. 4, in the vehicle lower structure 1C of the present embodiment, the supported member 30C is composed of an elastic member 38C. The supported member 30C is sandwiched between the fixed portion 25C and the extension member 15 in the up-and-down direction.

[0099] According to the above-described configuration, as Figure 16 shown in FIG. 4, the supported member 30C is elastically deformed to be compressed in the up-and-down direction, whereby the supported member 30C can allow the electric power storage device 20 to be deformed in a manner of being flexed toward the upper side. That is, in the present embodiment, the fixed portion 25C is also suppressed from being displaced downward by being fixed with the supported member 30C. Specifically, the fixed portion 25 is suppressed from being displaced downward by being fixed to the supported member 30C that has been extended to a predetermined thickness due to elastic deformation. Also, the supported member 30C is configured so that the fixed portion 25C can be displaced upward.

[0100] Further, in the present embodiment, the fixed portion 25C is the upper portion of the electric power storage module 21, but can also be the upper plate 221. In the present embodiment, the elastic member 38C is disposed in the hole portion formed in the upper plate 221.

[0101] The elastic member 38C can be a rubber-like member, or can be a molded body composed of a foamed resin. The elastic member 38C and the extension member 15 (the protruding portion 153) are, for example, joined to each other by an adhesive member.

[0102] In the description of the above-described embodiments, the configurations that can be combined can also be combined with each other.

[0103] The embodiments of the present application have been described, but it should be considered that the disclosed embodiments are illustrative and not restrictive in all aspects. The scope of the present application is shown by the claims, and is intended to include all modifications within the meaning and range equivalent to the claims.

Claims

1. A vehicle underbody structure, characterized in that, include: A pair of longitudinal beams; An extension member extending from at least one of the pair of longitudinal beams between the pair of longitudinal beams; An energy storage device, which is fixed to the pair of longitudinal beams and disposed below the extension member; as well as The supported member is fixed to the upper part of the energy storage device and supported by the extension member. The energy storage device includes a fixed portion, which is prevented from shifting downward by being fixed to the supported member. The supported member is configured such that the fixed portion can be moved upward.

2. The vehicle substructure according to claim 1, characterized in that, The supported member has: A column portion, the column portion extending upward from the fixed portion; and The cantilever beam extends from the column in a generally horizontal direction. The cantilever beam is supported from below by the extension member.

3. The vehicle substructure according to claim 2, characterized in that, The supported member also has a buffer member disposed between the cantilever beam portion and the extension member.

4. The vehicle substructure according to any one of claims 1 to 3, characterized in that, The extension member is a crossbeam that extends from one of the longitudinal beams of the pair of longitudinal beams to the other longitudinal beam.

5. The vehicle substructure according to claim 2 or 3, characterized in that, The extension member extends from one of the pair of longitudinal beams and is separate from the other longitudinal beam. The column and the extension member are arranged in the vehicle width direction. The cantilever beam extends along the upper surface of the extension member.

6. The vehicle substructure according to claim 1, characterized in that, The supported member has a telescopic portion, the telescopic portion being configured such that its length can change. The fixed portion is suspended from the extension member by the supported member.

7. The vehicle substructure according to claim 1, characterized in that, The supported member is composed of elastic members. The supported member is clamped between the fixed part and the extended member in the vertical direction.

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