JP2017077839A - Battery mounting structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery mounting structure for a vehicle that can sufficiently protect a battery at a side collision while securing a ground height of the battery even if using an existing vehicle body skeleton member.SOLUTION: A battery mounting structure for a vehicle V comprises a floor panel 1 and a pair of left and right floor frames 2 constituting a pair of left and right closed cross sections C1 at the lower surface side of the floor panel 1, and has a battery 3 arranged below a swelling portion 12 swelling out upward from the floor panel 1, which further comprises a tunnel portion 11 protruding toward a vehicle interior and extending in a longitudinal direction, and a pair of left and right tunnel side frames 4 constituting a pair of closed cross sections C2 at a lower surface side of the floor panel 1. The swelling portion 12 is formed between an outer end part in a vehicle width direction of the floor frame 2 and an inner end part in the vehicle width direction of the tunnel side frame 4, and at least parts of folding parts 12a and 12b of the swelling portion 12 are formed at a part of at least either one closed cross section of the first and second closed cross sections C1 and C2.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a battery mounting structure for a vehicle, and more particularly to a battery mounting structure for a vehicle in which a battery is disposed below a bulging portion that bulges upward from a floor panel.

Conventionally, a lead battery having a rated voltage of 12 V is disposed in an engine room.
Electric vehicles and hybrid vehicles, which have been increasing in recent years, are equipped with large battery units. Further, an auxiliary battery such as a lithium ion battery is mounted in addition to a normal lead battery in a vehicle including a power supply device that is charged by regenerative power generation that is regeneratively braked.
Such a large battery unit or auxiliary battery (hereinafter simply referred to simply as a battery) has a high temperature in the engine room and is difficult in terms of space. It's not easy.
Therefore, from the viewpoint of the layout, a battery mounting structure has been proposed in which a battery is disposed using an external space of the engine room, for example, a lower portion of the floor panel.

The battery mounting structure of a vehicle of Patent Document 1 includes a floor panel that is spanned between a pair of left and right side sills, and a battery for an electric vehicle that is disposed below the floor panel. A protrusion that protrudes below the cushion and above the general surface of the floor panel is formed, and a protrusion that covers the protrusion from above is formed on the floor panel.
Thereby, even if the seat pipe (seat frame) is deformed at the time of a side collision, the direct impact of the seat pipe on the protruding portion is suppressed by the convex portion of the floor panel while securing the ground clearance of the battery.

JP 2013-23163 A

The battery mounting structure of the vehicle of patent document 1 comprises the convex part of the longitudinal cross-section substantially trapezoid shape by forming the upper side bending part and the lower side bending part formed in the lower side in the floor panel.
As a result, when a relatively small side impact load is applied, deformation on the vehicle body side including the side sill and the floor panel is unlikely to occur, so that impact due to interference between the seat pipe and the battery is suppressed via the convex portion. It is possible to protect the battery.
However, when a large side impact load is applied, the battery cannot be sufficiently protected.
That is, when a large side impact load is applied, the side sill moves to the passenger compartment side due to the side impact load, and accordingly, a load toward the passenger compartment side acts on the load input side end of the floor panel. The floor panel is deformed starting from the upper bent portion or the lower bent portion of the convex portion.
Therefore, there is a risk that the battery may be directly impacted by the interference between the deformed floor panel and the battery, so measures such as the provision of reinforcing members and an increase in plate thickness are required. Could increase and there was room for improvement.

  The objective of this invention is providing the battery mounting structure etc. of the vehicle which can fully protect a battery at the time of a side collision, ensuring the ground clearance of a battery.

  The battery mounting structure for a vehicle according to claim 1 comprises a floor panel constituting a passenger compartment floor surface, and a pair of left and right first closed sections extending in the front-rear direction in cooperation with the floor panel on the lower surface side of the floor panel. A vehicle battery mounting structure in which a battery is disposed below a bulging portion that bulges upward from the floor panel, and a vehicle compartment in a vehicle width direction central portion of the floor panel. A left and right tunnel portion extending in the front-rear direction in cooperation with the floor panel on the lower surface side of the floor panel at the left and right end positions of the tunnel portion. A pair of tornell side frames, and the bulging portion is formed between an outer end portion in the vehicle width direction of the floor frame and an inner end portion in the vehicle width direction of the tornell side frame facing the floor frame. It is, is characterized in that at least a portion of the bent portion of the bulging portion is formed in a part of the first, at least one of the closed cross section of the second closed section.

In this vehicle battery mounting structure, the bulging portion in which the battery is disposed below is between the outer end portion in the vehicle width direction of the floor frame and the inner end portion in the vehicle width direction of the tornell side frame facing this. Since it is formed, the battery can be disposed above the general surface of the floor panel, and the ground height of the battery can be ensured.
Since at least a part of the bent part of the bulging part is formed on a part of at least one of the first and second closed sections, the strength of the bent part formed on a part of the closed section And the deformation of the floor panel starting from the bent portion at the time of a side collision can be suppressed.

According to a second aspect of the present invention, in the first aspect of the invention, the outer side in the vehicle width direction is arranged from the tunnel portion in the vehicle width direction so as to cross the upper side of the bulging portion and cooperate with the floor panel on the upper surface side of the floor panel. The floor cross member which comprises the 3rd closed cross section extended in this is provided, It is characterized by the above-mentioned.
According to this configuration, the deformation of the floor panel starting from the bent portion at the time of a side collision can be further suppressed using the floor cross member, and the direct impact received by the battery at the time of a side collision is reduced. be able to.

According to a third aspect of the present invention, in the second aspect of the present invention, a pair of left and right floor upper frames constituting a pair of left and right fourth closed sections extending in the front-rear direction in cooperation with the floor panel are provided on the upper surface side of the floor panel. The bent portion of the bulging portion includes an upper bent portion and a lower bent portion formed below the upper bent portion, and a rear end portion of the floor upper frame is formed on the upper side. The bent portion and the lower bent portion are joined to the front side wall portion of the floor cross member so that a joined portion of the floor cross member is formed in a part of the fourth closed cross section. .
According to this configuration, it is possible to further suppress the deformation of the floor panel starting from the upper bent portion and the lower bent portion at the time of a side collision using the floor upper frame, and the battery receives during a side collision. Direct impact can be reduced.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the outer side portion of the upper bent portion and the lower bent portion and the front side portion of the floor cross member is one of the fourth closed cross sections. It is formed in the part.
According to this configuration, the strength of the upper bent portion and the lower bent portion can be increased in a wide range, and the direct impact received by the battery can be further reduced.

  According to the vehicle battery mounting structure of the present invention, the battery can be sufficiently protected at the time of a side collision while securing the ground clearance of the battery while using the existing vehicle body skeleton member.

1 is a perspective view of a lower vehicle body of a vehicle according to a first embodiment. It is a top view of a lower vehicle body. It is a principal part enlarged view of FIG. It is a bottom view of a lower vehicle body. It is a principal part enlarged view of FIG. FIG. 6 is a view corresponding to FIG. 5 with the mounting bracket omitted. It is a perspective view of a mounting bracket. It is a top view of a mounting bracket. It is a perspective view of a load transmission member. It is the principal part enlarged view which abbreviate | omitted the battery from FIG. It is the figure which abbreviate | omitted the floor panel from FIG. It is a figure which shows a base bracket, Comprising: (a) is the perspective view seen from diagonally downward, (b) is a front view, (c) is the side view seen from the vehicle width direction outer side. FIG. 3 is a sectional view taken along line XIII-XIII in FIG. 2. It is the XIV-XIV sectional view taken on the line of FIG. It is the XV-XV sectional view taken on the line of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The following description exemplifies the present invention and does not limit the present invention, its application, or its use.

Embodiment 1 of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 to 6, a vehicle V according to this embodiment includes a rectangular floor panel 1 made of a steel plate that constitutes a floor surface of a passenger compartment, and a first extending in the front-rear direction in cooperation with the floor panel 1. A pair of left and right floor frames 2 constituting the closed section C1 and a battery 3 or the like capable of storing electric power to be supplied to the on-vehicle electrical components below the floor panel 1 are provided.
In the following description, the arrow F direction is the front, the arrow L direction is the left, and the arrow U direction is the upper.

First, the premise structure of the vehicle V is demonstrated.
The floor panel 1 includes a pair of left and right tunnel side frames 4 constituting a second closed cross section C2 extending in the front-rear direction in cooperation with the floor panel 1, and a substantially rectangular front side partially covering the tunnel portion 11 from below. And the rear braces 5 and 6, the floor cross member 7 constituting the third closed section C3 extending in the left-right direction in cooperation with the floor panel 1, and the fourth closed section C4 extending in the front-rear direction in cooperation with the floor panel 1. Are provided with a pair of left and right floor upper frames 8.
The floor panel 1 is formed so as to extend substantially horizontally from the lower end of the inclined portion of the dash panel (not shown) to the rear, and the left and right ends of the pair of left and right side sills 9 extend in the vehicle width direction inner side wall portion. Each is connected to the lower end portion.

As shown in FIGS. 1 to 3, a tunnel portion 11 that protrudes toward the passenger compartment and extends in the front-rear direction is formed at the center portion in the vehicle width direction of the floor panel 1, and on the right side of the tunnel portion 11 of the floor panel 1. Is formed with a bulging portion 12 bulging toward the passenger compartment.
As shown in FIGS. 10, 11, and 13, the pair of left and right tunnel side frames 4 are formed in a substantially hat shape in cross section, and left and right flange portions 4 d on the lower surface of the floor panel 1 at both left and right positions of the tunnel portion 11. , 4e are joined to each other.
As shown in FIG. 4, the front brace 5 connects the left and right end positions of the tunnel portion 11 corresponding to the front end side portion of the floor panel 1, and the rear brace 6 is a tunnel portion corresponding to the intermediate portion of the floor panel 1. The left and right end positions of 11 are connected. These braces 5 and 6 are reinforcing members provided to suppress vibration of the floor panel 1.

The floor cross member 7 connects the inner side wall portions of the pair of left and right side sills 9 with the tunnel portion 11 therebetween. As shown in FIG. 14, the floor cross member 7 has a substantially hat-shaped cross section, and the front and rear flange portions 7 d and 7 e are joined to the upper surface of the floor panel 1 at positions corresponding to the vicinity of the rear end of the front brace 5, respectively. ing.
As shown in FIGS. 1 to 3, a pair of left and right rear floor cross members 10 are provided behind the floor cross member 7. The pair of rear floor cross members 10 connect the inner side wall portions in the vehicle width direction of the pair of left and right side sills 9 with the tunnel portion 11 therebetween. The floor cross member 7 and the rear floor cross member 10 support the left and right front seats via slide rails (both not shown).

As shown in FIGS. 3 and 15, the pair of left and right floor upper frames 8 are formed in a substantially hat shape in cross section, and the rear ends thereof are joined to the front side wall portion 7 a of the floor cross member 7.
The pair of floor upper frames 8 have left and right flange portions 8d and 8e joined to the upper surface of the floor panel 1 from the front end portion to the rear end portion.

The pair of left and right floor frames 2 are respectively arranged at intermediate positions between the tunnel side frame 4 and the side sill 9 in the front end side portion, and are respectively formed so as to move outward in the vehicle width direction as the rear side. The pair of floor frames 2 are formed in a substantially hat shape in cross section, and left and right flange portions 2d and 2e are joined to the lower surface of the floor panel 1, respectively.
The lower side wall part 2c of the floor frame 2 is disposed so as to be at a lower position than the lower side wall part 4c of the tunnel side frame 4.
As shown in FIG. 15, at the front side of the floor cross member 7 of the floor frame 2, the left and right flange portions 2d and 2e are interposed between the left and right flange portions 8d and 8e of the floor upper frame 8 with the floor panel 1 interposed therebetween. They are joined by triple welding.
The battery 3 is formed in a substantially rectangular parallelepiped unit, and is disposed below the bulging portion 12 in a state of being slightly separated from the floor panel 1. The battery 3 includes a plurality of (for example, eight) battery modules (secondary batteries) that can be charged and discharged, and is supported by a mounting bracket 21 described later.

Next, the bulging portion 12 will be described.
As shown in FIGS. 1 to 3, the bulging portion 12 is formed in the right half of the floor panel 1 at a front side position relative to the right rear floor cross member 10 and between the right side sill 9 and the tunnel portion 11. Has been.
As shown in FIGS. 3, 13, and 15, the bulging portion 12 includes an upper bent portion 12 a that forms a substantially rectangular flat portion at a height position higher than a general surface that occupies most of the floor panel 1. The lower bent portion 12b is formed below the upper bent portion 12a and bent upward from the general surface, and has a substantially trapezoidal cross section.
Note that the portion surrounded by the lower bent portion 12 b corresponds to the bulging portion 12.
Further, the bent portion is a curved inflection portion in which the curvature of the floor panel 1 changes abruptly with respect to a general surface, and includes a inflection portion that can be a starting point of deformation at the time of a side collision.

  The lower bent portion 12b has a front end portion located in front of the rear end portion of the front brace 5, a rear end portion substantially parallel to the front end portion, and a front side of the front end portion of the rear floor cross member 10. Are arranged to be. Therefore, since the floor cross member 7 is disposed so as to cross the upper side of the bulging portion 12, the front and rear flange portions 7 d and 7 e are joined so as to cross the upper surface of the bulging portion 12. Thus, the strength of the bent portions 12a and 12b is increased.

Further, the lower bent portion 12b is formed so that the left end side portion is formed along the tunnel side frame 4 and located on the right side of the left end portion of the tunnel side frame 4, and the right end side portion is disposed on the floor frame 2. Are arranged so as to be located on the left side of the right end portion of the floor frame 2.
In the present embodiment, the left end portion of the upper bent portion 12 a is on the left side of the right side wall portion 4 b of the tunnel side frame 4, and the left end portion of the lower bent portion 12 b is on the left side wall portion 4 a of the tunnel side frame 4. Is also formed on the right side. Therefore, the left end portions of the bent portions 12a and 12b are formed in a part of the second closed cross section C2. Further, the right end portion of the upper bent portion 12a is located on the right side of the left side wall portion 2a of the floor frame 2, and the right end portion of the lower bent portion 12b is located on the left side of the right side wall portion 2b of the floor frame 2. It is formed as follows. Therefore, the right end side portions of the bent portions 12a and 12b are formed in a part of the first closed cross section C1.
Thereby, the intensity | strength increase of the left end side part and right end side part of bending part 12a, 12b is aimed at.

As shown in FIG. 15, of the right end side portions of the bent portions 12 a and 12 b, the front side portion of the floor cross member 7 is the right end side portion of the upper bent portion 12 a and the left side wall portion 8 a of the floor upper frame 8. Further, it is formed so that the right end side portion of the lower bent portion 12 b is located on the left side of the right side wall portion 8 b of the floor upper frame 8. Further, the rear end portion of the floor upper frame 8 is joined to the floor cross member 7 so as to form a joint portion between the bent portions 12a and 12b and the floor cross member 7 in a part of the fourth closed cross section C4. .
Accordingly, the right end side portions of the bent portions 12a and 12b are sandwiched between the floor frame 2 and the floor upper frame 8 from both the upper and lower directions, whereby the right end portions of the bent portions 12a and 12b are set to the first closed cross section C1 and the fourth closed section C1. It can be taken in as a node portion of the closed cross section consisting of the closed cross section C4.

Next, the mounting bracket 21 will be described.
As shown in FIGS. 4, 5, and 13, the mounting bracket 21 is configured to support the battery 3 and a load transmission member 22, which will be described later, from below, and to attach these to the vehicle body side.
As shown in FIGS. 7 and 8, the mounting bracket 21 is formed by pressing a steel plate, and includes a main body portion 21 a that supports the battery 3 and the load transmission member 22, and five mounting portions for mounting on the vehicle body side. 21b-21f etc. are provided.

The main body portion 21 a is disposed so as to be substantially at the same height as the lower side wall portion 4 c of the tunnel side frame 4. A plurality of support bolt holes b1 for fixing the battery 3 via bolts (not shown) and a load transmission member 22 are fixed to the mounting bracket 21 via bolts (not shown). A plurality of support bolt holes b2 are formed.
The plurality of support bolt holes b1 are provided in a total of eight, four in each so as to be aligned in the front-rear direction in the left end portion and the right end portion of the main body portion 21a. The plurality of support bolt holes b2 are provided in a pair of front and rear in the rear half of the main body portion 21a at a position on the right side of the support bolt hole b1 at the right end portion of the main body portion 21a.

As shown in FIGS. 7 and 8, the attachment portions 21b to 21f are formed so as to project outward from the main body portion 21a substantially horizontally, and the attachment bracket 21 is connected to the vehicle body side via bolts (not shown). Each has fixing bolt holes b3 for fixing.
As shown in FIGS. 4 and 5, the attachment portions 21 b to 21 d are respectively formed on the front end side portion, the middle portion, and the rear end side portion of the left end portion of the main body portion 21 a, and are formed on the lower side wall portion 4 c of the tunnel side frame 4. Fastened and fixed by bolts. The attachment portion 21e is formed at the rear end portion of the main body portion 21a, and is fastened and fixed to the floor panel 1 with bolts. The attachment portion 21f is formed in a substantially crank-shaped cross section that is bent upward from a middle portion of the right end portion of the main body portion 21a and then bent rightward. The attachment portion 21f is fastened and fixed to a pedestal bracket 23 described later by bolts.
The plurality of fixing bolt holes b3 are provided in a pair of front and rear in the attachment portions 21b, 21d, and 21f, provided in a pair on the left and right in the attachment portion 21e, and provided in the attachment portion 21c.

Next, the load transmission member 22 will be described.
When the rectangular parallelepiped battery 3 is arranged on the inner side in the vehicle width direction of the floor frame 2 that moves to the outside in the vehicle width direction on the rear side, the separation distance between the battery 3 and the floor frame 2 differs in the front-rear direction, There is a possibility that the impact load may act locally on the battery 3.
As shown in FIG. 6, the load transmission member 22 is interposed between the floor frame 2 and the battery 3 below the floor panel 1, and is a side that acts locally on the battery 3 at the time of a side collision of the vehicle V. It is configured to avoid a sudden load. The load transmission member 22 is integrally formed of a metal material having an excellent impact absorption efficiency, such as an aluminum alloy material.

  As shown in FIGS. 6 and 9, the load transmission member 22 includes a front side wall portion 22 a extending to the left and right substantially orthogonal to the front-rear direction, a rear side wall portion 22 b substantially parallel to the front side wall portion 22 a, and a floor A first wall surface portion 22c extending along the left side wall portion 2a of the frame 2, a second wall surface portion 22d extending along the right side portion of the battery 3, and a first wall connecting the first wall surface portion 22c and the second wall surface portion 22d. -4th rib part 22e-22h etc. are provided.

  Since the first wall surface portion 22 c is along the left wall portion 2 a of the floor frame 2, the first wall surface portion 22 c is formed so as to move to the right side as the rear side. The first wall surface portion 22c is disposed so as to be spaced apart from the left side wall portion 2a of the floor frame 2 with a slight gap. Thereby, at the time of a side collision, the impact energy can be absorbed in a stage before the floor frame 2 and the load transmission member 22 interfere with each other, and the side collision load acting on the battery 3 can be reduced.

The first to fourth rib portions 22e to 22h are each formed so as to move rearward toward the left side.
Specifically, the first to fourth rib portions 22 e to 22 h are disposed so as to be substantially orthogonal to the left side wall portion 2 a of the floor frame 2.
Attachment portions 22i and 22j each having a screw hole are formed at the lower left portions of the first rib portion 22e and the third rib portion 22g, respectively. These attachment portions 22i and 22j are fastened and fixed to the pair of support bolt holes b2 of the attachment bracket 21 by bolts.
Accordingly, when the floor frame 2 moves to the left and contacts the first wall surface portion 22c at the time of a side collision, the side impact load acting on the first wall surface portion 22c is evenly distributed to the second wall surface portion 22d. As a result, local load concentration on the battery 3 is avoided.

Next, the base bracket 23 will be described.
The pedestal bracket 23 supports the mounting portion 21f of the mounting bracket 21 on the vehicle body side.
As shown in FIGS. 12A to 12C, the pedestal bracket 23 is formed by pressing a steel material so that the front and rear lengths become longer toward the left side when viewed from the bottom, and the side surface from the right side. It is formed so that the front and rear lengths become longer toward the upper side as viewed.
The pedestal bracket 23 includes a lower flange portion 23a, a pedestal portion 23b, a side wall portion 23c, an upper flange portion 23d, a pair of reinforcing portions 23e, and the like.

As shown in FIG. 13, the lower flange portion 23 a is joined to the left wall portion 2 a of the floor frame 2 by welding. The pedestal portion 23b is connected to the upper end portion of the lower flange portion 23a and is formed so as to extend substantially horizontally toward the left side, so that the pedestal portion 23b is disposed in the vicinity of the left side wall portion 2a of the floor frame 2. The pedestal portion 23 b is disposed so as to be higher than the lower side wall portion 4 c of the tunnel side frame 4.
The pedestal portion 23b includes a pair of front and rear bolt holes, and the pair of bolt holes are aligned with the fixing bolt holes b3 of the mounting portion 21f and fastened with bolts, thereby overlapping the mounting portion 21f of the mounting bracket 21. It is configured to be connectable.

The side wall part 23c is formed so as to rise substantially vertically from the left end part of the pedestal part 23b.
As shown in FIG. 10, the upper flange portion 23d is connected to the floor panel 1 in a manner connected to the upper end portion of the side wall portion 23c.
As shown in FIGS. 12C and 14, the upper flange portion 23 d is formed so that the middle portion in the front-rear direction is recessed downward. As shown in FIG. 11, the front end side portion and the rear end side portion of the upper flange portion 23d are joined to the front flange portion 7d and the rear flange portion 7e of the floor cross member 7 by welding with the floor panel 1 interposed therebetween. Has been.
Accordingly, the mounting portions 21b to 21d of the mounting bracket 21 are fixed to the lower side wall portion 4c of the tunnel side frame 4, and the mounting portion 21f is fixed to the pedestal bracket 23 fixed to the floor panel 1 and the floor frame 2. At the time of a side collision, the side impact load is distributed and transmitted to the floor frame 2 via the pedestal bracket 23, and when the floor frame 2 moves to the left side, the side impact load is distributed and transmitted to the Tornel side frame 4 via the mounting bracket 21. Thus, the leftward movement of the floor frame 2 is suppressed. Moreover, since the battery 3 is fixed to the mounting bracket 21, even when the floor frame 2 moves to the left side, the battery 3 follows the mounting bracket 21 and moves to the left side. Direct impact from the frame 2 can be suppressed.

  As shown in FIG. 12A, the pair of reinforcing portions 23e are each formed in a substantially triangular shape, and connect the base portion 23b, the side wall portion 23c, and the upper flange portion 23d, respectively. The pair of reinforcing portions 23e are inclined with respect to the pedestal portion 23b and the side wall portion 23c so as to form a predetermined crossing angle with respect to the front-rear direction. Thereby, the intensity | strength of the base bracket 23 can be increased and the side collision load which acted on the floor frame 2 at the time of a side collision is efficiently distributed to the floor cross member 7 grade | etc.,.

Next, operations and effects of the battery mounting structure of the vehicle V will be described.
According to the battery mounting structure of the vehicle V, the bulging portion 12 in which the battery 3 is disposed below is arranged in the vehicle width direction of the tornel side frame 4 facing the vehicle width direction outer end portion of the floor frame 2. Since it is formed between the inner end portion, the battery 3 can be disposed above the general surface of the floor panel 1, and the ground height of the battery 3 can be ensured.
Since at least a part of the bent parts 12a and 12b of the bulging part 12 is formed in a part of at least one of the first and second closed cross sections C1 and C2, it is formed in a part of the closed cross section. The strength of the bent portions 12a and 12b can be increased, and deformation of the floor panel 1 starting from the bent portions 12a and 12b at the time of a side collision can be suppressed.

  A floor cross member that is disposed so as to cross the upper side of the bulging portion 12 and that forms a third closed cross-section C3 that extends outward from the tunnel portion 11 in the vehicle width direction in cooperation with the floor panel 1 on the upper surface side of the floor panel 1. 7, the deformation of the floor panel 1 starting from the bent portions 12a and 12b at the time of a side collision can be further suppressed using the floor cross member 7, and the battery 3 directly receives at the time of a side collision. Impact can be reduced.

  The floor panel 1 includes a pair of left and right floor upper frames 8 that form a pair of left and right fourth closed cross sections C4 extending in the front-rear direction in cooperation with the floor panel 1, and a bent portion of the bulging portion 12 It includes an upper bent portion 12a and a lower bent portion 12b formed below the upper bent portion 12a, and the rear end portion of the floor upper frame 8 has an upper bent portion 12a and a lower bent portion. The joint portion between the portion 12b and the floor cross member 7 is joined to the front side wall portion 7a of the floor cross member 7 so as to be formed at a part of the fourth closed cross section C4. Thereby, the deformation | transformation of the floor panel 1 from the upper side bending part 12a and the lower side bending part 12b at the time of a side collision can further be suppressed using the floor upper frame 8, and the battery 3 can be used at the time of a side collision. The direct impact received by the can be reduced.

  The outer side portion in the vehicle width direction of the upper bent portion 12a and the lower bent portion 12b and the front side portion of the floor cross member 7 are formed in a part of the fourth closed cross section C4. The strength of the bent portion 12a and the lower bent portion 12b can be increased, and the direct impact received by the battery 3 can be further reduced.

Next, a modified example in which the embodiment is partially changed will be described.
1) The battery of the above embodiment may be a chargeable / dischargeable battery, and is an ordinary lead battery, a battery for driving an electric vehicle, a battery for a hybrid vehicle, and an auxiliary battery for a vehicle provided with a power supply device that is charged by regenerative power generation. It can be applied to any battery mounting.

2] In the above-described embodiment, the example in which the bulging portion is formed in the right half of the floor panel has been described. However, the bulging portion may be formed in the left half of the floor panel. It is also possible to form bulges on both sides and mount batteries under the bulges on both the left and right sides.

3] In the above-described embodiment, the example in which the bulging portion includes the upper and lower two bent portions has been described. However, the bulged portion may include a single bent portion or three or more bent portions. When three or more bent portions are provided, at least one of the bent portions is formed in a part of the closed cross section of the floor frame or the tunnel side frame, so that the effect of the present invention can be achieved. Is possible.

4] In the above embodiment, the left end portion of the upper bent portion and the lower bent portion is formed in a part of the closed cross section of the tunnel side frame, and the right end portion of the upper bent portion and the lower bent portion. However, only one of the upper bent portion and the lower bent portion may be formed in a part of the closed cross section. Only one of the left end portion and the right end portion of the part may be formed in a part of the closed cross section.

5] In the above embodiment, an example of a pair of left and right floor frames moving toward the outside in the vehicle width direction has been described, but a pair of left and right floor frames formed with a constant distance therebetween may be used. good.
6) In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

V vehicle 1 floor panel 2 floor frame 3 battery 4 tunnel side frame 7 floor cross member 7a (floor cross member) front side wall portion 8 floor upper frame 11 tunnel portion 12 bulging portion 12a upper bent portion 12b lower bent portion C1 1st closed section C2 2nd closed section C3 3rd closed section C4 4th closed section

Claims (4)

A floor panel constituting a passenger compartment floor surface, and a pair of left and right floor frames constituting a pair of left and right first closed sections extending in the front-rear direction in cooperation with the floor panel on the lower surface side of the floor panel; In the vehicle battery mounting structure of the vehicle in which the battery is disposed below the bulging portion bulging upward from the floor panel,
A tunnel portion projecting toward the passenger compartment side in the vehicle width direction center portion of the floor panel and extending in the front-rear direction;
A pair of left and right tornel side frames constituting a pair of left and right second closed sections extending in the front-rear direction in cooperation with the floor panel on the lower surface side of the floor panel at both left and right positions of the tunnel portion;
The bulging portion is formed between the outer end portion in the vehicle width direction of the floor frame and the inner end portion in the vehicle width direction of the tornel side frame facing this,
A battery mounting structure for a vehicle, wherein at least a part of the bent part of the bulging part is formed in a part of at least one of the first and second closed cross sections.   A floor cross member which is arranged so as to cross the upper side of the bulging portion and which forms a third closed cross section extending in the vehicle width direction from the tunnel portion in cooperation with the floor panel on the upper surface side of the floor panel; The battery mounting structure for a vehicle according to claim 1. A pair of left and right floor upper frames constituting a pair of left and right fourth closed sections extending in the front-rear direction in cooperation with the floor panel on the upper surface side of the floor panel;
The bent portion of the bulging portion includes an upper bent portion and a lower bent portion formed below the upper bent portion,
The rear end portion of the floor upper frame is formed on the floor cross member such that a joint portion between the upper bent portion and the lower bent portion and the floor cross member is formed in a part of the fourth closed cross section. The vehicle battery mounting structure according to claim 2, wherein the vehicle battery mounting structure is joined to a front side wall portion.   4. The outer side portion in the vehicle width direction of the upper side bent portion and the lower side bent portion and the front side portion of the floor cross member are formed in a part of the fourth closed cross section. The vehicle battery mounting structure described in 1.