JP6284041B2 - Vehicle battery mounting structure - Google Patents

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 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 vehicle battery mounting structure of Patent Document 1 includes a floor panel spanned between a pair of left and right side sills, and a pair of left and right sides extending in the front-rear direction in cooperation with the floor panel on the lower surface side of the floor panel. A pair of left and right floor side frames (also referred to as a floor frame) constituting a closed cross section and an electric vehicle battery disposed below the floor panel, the battery being lower than the seat cushion and the general floor panel A protrusion that protrudes upward from the surface is formed, and a protrusion that covers the protrusion from above is formed on the floor panel.
Accordingly, even if the seat pipe (seat frame) is deformed relative to the battery at the time of a side collision, the direct impact of the seat pipe against the protruding portion is detected by the convex portion of the floor panel while ensuring the ground clearance of the battery. It is suppressed by.

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.
Thereby, when a comparatively small side collision load acts, the impact by interference with a seat pipe and a battery can be suppressed via a convex part, and it is possible to protect a battery.

However, when a large side impact load is applied, the battery is not sufficiently protected.
When a large side impact load is applied, the side sill, which is the vehicle body side rigid member, is moved inward in the vehicle width direction due to the side impact load, and thus the battery and the side sill may interfere with each other.
It is also possible to arrange a floor side frame between the battery and the side sill.
However, a member (for example, a floor cross member) disposed on the upper side of the battery is bent and deformed by a large side impact load, and the battery is directly deformed from above by the downward deformation of the member disposed on the upper side of the battery. There is a risk of receiving concentrated load.
In order to take measures against the above problems, measures such as arrangement of reinforcing members and increase in plate thickness are required. In this case, there is a possibility that the weight may increase and there is room for improvement.

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

  The battery mounting structure for a vehicle according to claim 1 includes a floor panel that forms a passenger compartment floor surface, and a left and right pair that forms a pair of left and right closed sections extending in the front-rear direction in cooperation with the floor panel on the lower surface side of the floor panel. A pair of floor frames, 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, and a vehicle from the tunnel portion in cooperation with the floor panel on the upper surface side of the floor panel And a floor cross member having a closed cross section extending outward in the width direction, wherein the battery is mounted below the floor panel and between the floor frame and the tunnel portion. A pair of left and right tornell side frames that form a pair of left and right closed cross 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. And a reinforcing body connected to the floor frame and a tornell side frame opposed thereto to reinforce between the two, wherein the reinforcing body is located below the floor cross member and above the battery. It is characterized by being arranged in.

The battery mounting structure of this vehicle includes a reinforcing body that is connected to the floor frame and the tornell side frame that faces the floor frame and reinforces the gap between the two. A separation distance from the frame can be ensured.
Since the reinforcing body is arranged at the lower position of the floor cross member and at the upper position of the battery, the upper side of the battery can be protected by the reinforcing body even if the floor cross member is bent and deformed due to a side impact load. The impact that the battery receives from above can be reduced.

According to a second aspect of the present invention, there is provided a mounting bracket for supporting the battery from below and mounting the battery on the vehicle body side, and the mounting bracket is attached to a lower side wall portion or a floor panel of the Tornel side frame. It is connected through the reinforcing body.
According to this configuration, the side impact load can be distributed to the vehicle body side via the mounting bracket, and the downward bending deformation by the floor cross member can be suppressed.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a high-rigidity portion extending in a vehicle width direction is formed on the reinforcing body, and the high-rigidity portion is a closed structure formed by the floor cross member and a floor panel. It is characterized by being arranged so as to overlap the cross section in the vertical direction.
According to this configuration, the vertical rigidity of the floor cross member can be increased, and downward bending deformation by the floor cross member can be further suppressed.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the high-rigidity portion is formed by a recessed portion that is recessed downward, and the recessed portion forms a closed cross section that extends in the vehicle width direction in cooperation with a floor panel. It is characterized by doing.
According to this configuration, it is possible to increase the cross-sectional area of the closed cross section that connects the floor frame and the Tornel side frame that faces the floor frame, and it is possible to reliably suppress the downward bending deformation by the floor cross member. .

  According to the battery mounting structure for a vehicle of the present invention, it is possible to reduce the impact that the battery receives from above during a side collision.

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 a figure which shows a reinforcement body, 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. It is the XII-XII sectional view taken on the line of FIG. It is the XIII-XIII sectional view taken on the line of FIG. It is the XIV-XIV 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.

Hereinafter, Example 1 of the present invention will be described 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 FIG. 13, the pair of left and right tunnel side frames 4 are formed in a substantially hat shape in cross section, and the left and right flange portions 4d and 4e are joined to the lower surface of the floor panel 1 at the left and right end positions of the tunnel portion 11, respectively. ing.
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. 13, 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 14, the pair of left and right floor upper frames 8 are formed in a substantially hat shape in cross section, and the rear end portions thereof are joined to the front side wall portions 7 a of the floor cross member 7, respectively. 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. 14, the left and right flange portions 2d and 2e are located on the front side of the floor cross member 7 of the floor frame 2 with the left and right flange portions 8d and 8e of the floor upper frame 8 interposed between the floor panels 1. 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, 12, and 14, 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. 14, 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, so that the right end side portions of the bent portions 12a and 12b are the first closed cross section C1 and the fourth 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 12, 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 21b and 21d are formed on the front end side portion and the rear end side portion of the left end portion of the main body portion 21a, respectively, and fastened to the lower side wall portion 4c of the tunnel side frame 4 with bolts. Fixed. The attachment portion 21c is formed in the middle of the left end portion of the main body portion 21a, and is fastened and fixed to the lower side wall portion 4c of the tunnel side frame 4 by a bolt with a reinforcing body 23 described later interposed therebetween. In addition, you may fasten and fix this attaching part 21c to the floor panel 1 with the volt | bolt through the reinforcement body 23 in between.

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 downward 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 the lower side wall portion 2c of the floor frame 2 by a bolt with a reinforcing body 23 therebetween.
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 outer side in the vehicle width direction on the rear side, the separation distance between the right side portion of the battery 3 and the left side wall portion 2a of the floor frame 2 is In the case of a side collision, the side impact load acting from the floor frame 2 may locally act around the front corner of the right side (right side wall) of 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 right side of the battery 3 is avoided.

Next, the reinforcing body 23 will be described.
As shown in FIGS. 6 and 12, the reinforcing body 23 is formed of a steel plate, and is connected to the lower wall portion 2 c of the right floor frame 2 and the lower wall portion 4 c of the right tornell side frame 4. The space is reinforced. Thereby, below the bulging part 12, the intensity | strength of the left-right direction is made higher in the area | region where the reinforcement body 23 is arrange | positioned than the area | region where the reinforcement body 23 is not arrange | positioned.
The reinforcing body 23 is arranged at the lower position of the floor cross member 7 and at the upper position of the battery 3. Thereby, the upper part of the battery 3 is protected.

As shown in FIGS. 11 (a) to 11 (c), the reinforcing body 23 is connected to upper ends of the left side wall 23a, the right side wall 23b, and the left side wall 23a and the right side wall 23b. A side wall 23c, a left flange 23d extending leftward from the lower end of the left wall 23a, a right flange 23e extending rightward from the lower end of the right wall 23b, and the like are integrally provided.
A recessed portion 23f that is continuously recessed from the lower end portion of the left side wall portion 23a to the lower end portion of the right side wall portion 23b is formed. The recessed portion 23f is formed at an intermediate portion in the front-rear direction of the left side wall portion 23a, the right side wall portion 23b, and the upper side wall portion 23c.

  As shown in FIG. 13, the front end portion and the rear end portion of the upper side wall portion 23c are overlapped with the front flange portion 7d and the rear flange portion 7e of the floor cross member 7 with the floor panel 1 interposed therebetween. ing. Therefore, the recessed portion 23f and the floor panel 1 connect the floor frame 2 and the tornell side frame 4 to form a closed cross section extending left and right. This closed cross section is adjacent to the third closed cross section C3 in the vertical direction. Yes. As a result, the cross-sectional area of the closed cross section connecting the floor frame 2 and the tornell side frame 4 is increased.

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, since the reinforcing body 23 that is connected to the floor frame 2 and the tornel side frame 4 that faces the floor frame 2 and reinforces the space between the two is provided, A separation distance from the tornel side frame 4 facing this can be ensured. Since the reinforcing body 23 is disposed at the lower position of the floor cross member 7 and at the upper position of the battery 3, even if the floor cross member 7 is bent and deformed due to a side impact load, the upper side of the battery 3 is Thus, the impact received by the battery 3 from above can be reduced.

  A mounting bracket 21 for supporting the battery 3 from below and mounting on the vehicle body side is provided, and the mounting bracket 21 is connected to the lower side wall portion 4c of the tornell side frame 4 or the floor panel 1 via the reinforcing body 23. The impact load can be distributed to the vehicle body side via the mounting bracket 21, and the downward bending deformation by the floor cross member 7 can be suppressed.

  Since the recessed portion 23f extending in the vehicle width direction is formed in the reinforcing body 23, and the recessed portion 23f is arranged so as to overlap the third closed cross section C3 formed by the floor cross member 7 and the floor panel 1, the floor The vertical rigidity of the cross member 7 can be increased, and the downward bending deformation by the floor cross member 7 can be further suppressed.

  The highly rigid portion is composed of a recessed portion 23f that is recessed downward, and the recessed portion 23f cooperates with the floor panel 1 to form a closed cross section that extends to the left and right. 4 can be increased, and the downward bending deformation by the floor cross member 7 can be reliably suppressed.

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, an example of a pair of left and right floor frames that move to the outside in the vehicle width direction has been described, but a pair of floor frames that move to the inside in the vehicle width direction in the rear side. Alternatively, a pair of left and right floor frames with a constant interval may be used.

4] 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 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.

5] In the 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.

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 4c Lower side wall portion 11 Tunnel portion 21 Mounting bracket 23 Reinforcing body 23f Recessed portion C1 First closed section C2 Second closed section C3 Third closed section

Claims (4)

A floor panel constituting a passenger compartment floor surface, a pair of left and right floor frames constituting a pair of left and right closed sections extending in the front-rear direction in cooperation with the floor panel on the lower surface side of the floor panel; A tunnel portion that protrudes toward the passenger compartment side in the vehicle width direction central portion and extends in the front-rear direction, and a floor that forms a closed cross section that extends outward in the vehicle width direction from the tunnel portion in cooperation with the floor panel on the upper surface side of the floor panel. In a battery mounting structure for a vehicle comprising a cross member, and a battery disposed below the floor panel and between the floor frame and the tunnel portion,
A pair of left and right tornell side frames constituting a pair of left and right closed cross 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;
A reinforcement body connected to the floor frame and a tornell side frame facing the floor frame to reinforce the gap between the two;
A battery mounting structure for a vehicle, wherein the reinforcing body is disposed at a lower position of the floor cross member and an upper position of the battery. A mounting bracket for supporting the battery from below and mounting on the vehicle body side,
The battery mounting structure for a vehicle according to claim 1, wherein the mounting bracket is connected to a lower side wall portion or a floor panel of the Tornel side frame via the reinforcing body. Forming a highly rigid portion extending in the vehicle width direction in the reinforcing body;
The battery mounting structure for a vehicle according to claim 1, wherein the high-rigidity portion is disposed so as to overlap vertically with a closed cross section formed by the floor cross member and the floor panel. The high-rigidity part is composed of a recessed part that is recessed downward,
4. The battery mounting structure for a vehicle according to claim 3, wherein the recessed portion forms a closed cross section extending in the vehicle width direction in cooperation with a floor panel.