JP6122807B2 - Car battery mounting structure - Google Patents

Description

  The present invention relates to an automobile battery mounting structure including a driving battery under a floor panel.

  Conventionally, a battery mounting structure has been disclosed in which a mounted battery is moved relative to the vehicle in the same direction as the impact input direction to absorb collision energy in the event of a vehicle collision (see, for example, Patent Document 1). .) This battery mounting structure is provided with a cross member that extends in the vehicle width direction on the upper surface of the floor panel to increase the rigidity of the vehicle, and a long hole that bolts the battery to the cross member is extended in the same direction as the cross member to cause vehicle collision. Sometimes the battery is moved along the cross member. That is, the battery is protected by improving vehicle rigidity and sliding the battery in the direction of impact input to absorb collision energy.

JP 2006-182099 A

  By the way, in the battery mounting structure described in Patent Document 1, the battery is fixed to the cross member by a bolt inserted into the long hole, and when a collision energy larger than the fastening force of the bolt acts due to a side collision or the like, the battery is The collision energy is absorbed by moving along the cross member by the length of the long hole against the fastening force. However, the degree of absorption of the collision energy depends on the fastening force of the bolt and the frictional force of the contact portion between the battery and the cross member, and it is difficult to manage the fastening force and frictional force of the bolt to a certain level. There is a risk of variations due to changes in workers and climate. In addition, the fastening force and the frictional force may change due to a long-term change over time, and there is room for improvement.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to stably absorb the collision energy and ensure the driving battery even if the collision energy acts from the side surface of the vehicle due to a side collision or the like. An object of the present invention is to provide a vehicle battery mounting structure that can be protected.

In order to achieve the above object, the invention according to claim 1
A driving battery (for example, a battery 26 in an embodiment described later);
A vehicle frame (e.g., a battery frame 28 in an embodiment described later) that houses the driving battery, and the battery frame is attached to a floor frame (e.g., a floor frame 14 in an embodiment described later). For example, a battery mounting structure of an electric vehicle V) in an embodiment described later,
The battery frame includes a pair of front and rear walls (for example, a front wall 30 and a rear wall 31 in an embodiment described below) positioned at the front and rear of the vehicle, and a pair of left and right positioned at the left and right sides of the vehicle. A connecting member (for example, described later) that connects a wall (for example, the left wall 41 and the right wall 42 in the embodiment described later), and the front and rear walls and the left and right walls at a corner (for example, a corner R in the embodiment described later). Connecting member 50) in the embodiment of
The connecting member has an L-shaped cross section, and is curved above the left and right walls and curved outward in the width direction (for example, a curved portion 56 in an embodiment described later), and the front and rear through the curved portion. A fixing portion (for example, a fixing portion 57 in an embodiment described later) that is coupled to the floor frame lower than the upper end of the wall.

In addition to the configuration of claim 1, the invention according to claim 2
At least one of the pair of front and rear walls has an extension portion (for example, an extension portion 34 in an embodiment described later) coupled to the connecting member,
The extension includes a bending flange (for example, an extension bending flange 36 in an embodiment described later) that is bent outward with respect to the driving battery in the front-rear direction.
The bending flange is continuous with at least one upper end of the pair of front and rear walls, and forms a closed section with the extension, the connecting member, and a reinforcing piece (for example, a reinforcing piece 60 in an embodiment described later),
A closed section of the curved portion (for example, a closed section S1 in an embodiment described later) is smaller than a closed section of the fixed portion (for example, a closed section S2 in an embodiment described later).

In addition to the structure of claim 2, the invention according to claim 3
The floor frame to which the fixing portion is coupled from above extends in the front-rear direction to the side of the floor (for example, floor F in the embodiment described later),
At least one of the pair of front and rear walls has a bending flange (for example, a flat plate portion bending flange 35 in an embodiment described later) that is continuous with the bending flange of the extension portion,
The bending flanges of at least one of the pair of front and rear walls and the bending flanges of the extension portions have a gate shape in a front view at a position higher than the floor frame.

The invention according to claim 4 includes, in addition to the structure according to any one of claims 1 to 3,
The left and right walls are made of a plate material having both ends bent in a U-shape, and bead protruding outward (for example, a bead 44 in an embodiment described later) on the side wall portion is formed to extend in the front-rear direction.
The left and right walls are fastened to the outer surface of the connecting member.

The invention according to claim 5 includes, in addition to the structure according to any one of claims 1 to 4,
The connecting member is welded to the front and rear walls, and further has a stud bolt (for example, a stud bolt 53 in an embodiment described later) extending in the width direction,
The connecting member is fastened with a nut (for example, a nut 46 in an embodiment described later) by passing the stud bolt through a bolt hole (for example, a bolt hole 45 in an embodiment described later) formed in the left and right walls. The front and rear walls and the left and right walls are joined at the corners.

In addition to the configuration of claim 2, the invention according to claim 6
Above the bending flange, a gate-shaped cross member (for example, a third cross member 13 in an embodiment described later) that is coupled to the floor frame is disposed outside the fixed portion in the vehicle width direction.

The invention according to claim 7 includes, in addition to the structure according to any one of claims 1 to 6,
The floor frame is opened in a C shape toward the rear of the automobile,
The fastening portion of the front wall is bolted in a closed cross section of the floor frame (for example, a closed cross section S3 in an embodiment described later),
The fixed portion of the rear wall is located outside the closed cross section of the floor frame and inside the floor frame in the vehicle width direction via a flange or a reinforcing plate (for example, a reinforcing plate 74 in an embodiment described later) of the floor frame. Fasten the bolts to the frame.

  According to the first aspect of the present invention, even when the automobile has a side collision (hereinafter, referred to as a side collision), the curved portion is deformed and the movement of the driving battery in the vehicle width direction can be prevented. In addition, since the connecting member reinforces the corner of the battery frame, the rigidity of the battery frame can be increased.

  According to the second aspect of the invention, it is possible to promote the deformation of the curved portion at the time of a side collision and to increase the support strength of the driving battery.

  According to the invention of claim 3, even if the floor frame is deformed to the driving battery side at the time of a side collision, the gate-shaped bending flange supports the load in the vehicle width direction, and then the curved portion is deformed. Can prevent damage.

  According to the invention of claim 4, the side collision strength of the side wall of the battery frame can be increased, and the rigidity as the frame of the battery frame can also be improved. Moreover, since the front and rear walls are also plate materials, the weight can be reduced.

  According to invention of Claim 5, press work is easy, it is excellent in parts handling property, and productivity can be improved.

  According to the invention of claim 6, the bending flange is lifted upward when the bending flange is deformed by the side collision, but the cross member is also deformed by the curved portion and moved upward to allow deformation of the curved portion of the battery frame. Therefore, the deformation of the bending flange can be promoted, the clearance between the floor and the battery can be maintained, and interference can be avoided.

  According to the seventh aspect of the present invention, it is possible to increase the capacity of the fuel tank disposed on the side where the letter C opens, and to secure the fastening strength between the battery frame and the floor frame.

It is the principal part perspective view which looked at the vehicle interior which employ | adopted the battery mounting structure of one Embodiment which concerns on this invention from the upper left side. It is the II-II sectional view taken on the line of FIG. It is a perspective view of the battery accommodated in the battery frame. It is a perspective view which removes a reinforcement piece and shows the corner | angular part of the battery frame with which the rear wall and the left wall were couple | bonded by the connection member. FIG. 4 is an enlarged perspective view of a portion A in FIG. 3. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. It is a disassembled perspective view of a battery frame. (A) is the IXA-IXA arrow directional cross-sectional view of FIG. 1, (b) is the IXB-IXB arrow directional cross-sectional view of FIG. (A) is principal part sectional drawing which shows the attachment state of the front wall before a collision, (b) is principal part sectional drawing which shows the attachment state of the front wall deform | transformed by collision.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals, and the arrows shown in the drawings indicate the positional relationship of the vehicles.

  An automobile adopting the battery mounting structure according to the present embodiment is an electric vehicle that travels with a driving force of a motor driven by electric power supplied from an IPU (Intelligent Power Unit) disposed under a floor panel.

  As shown in FIGS. 1 and 2, an electric vehicle V according to this embodiment includes a floor F on which a front seat 1 is installed, a skeleton member 2 that is mainly disposed below the floor F, and a lower side of the front seat 1. And an IPU 20 disposed under the floor F and an IPU protective case 8.

  The floor F includes a substantially plate-like floor panel 3 fixed to a pair of floor frames 14 constituting a part of the skeleton member 2, an IPU cover 4 provided on the floor panel 3, the floor panel 3 and the IPU. And an interior member floor carpet (not shown) attached to the upper surface of the cover 4.

  An opening 3 a is formed in the floor panel 3 at a position corresponding to the lower side of the front seat 1, and the upper side of the IPU 20 is disposed in a space below the front seat 1 beyond the floor panel 3.

  The IPU cover 4 is a cover member that swells upward and has an internal space on the lower surface side. The IPU cover 4 is fixed on the floor panel 3 so as to cover the opening 3 a of the floor panel 3 and covers the upper part of the IPU 20. Further, air intake ducts 51 for cooling the IPU 20 are provided on both the left and right sides of the IPU cover 4.

  The skeleton member 2 is disposed inward of the pair of left and right side sills 10 extending in the front-rear direction, the first cross member 11, the second cross member 12, the third cross member 13, and the side sill 10 extending in the left-right direction. And a pair of auxiliary frames 15 extending inwardly from the side sill 10 and connected to the floor frame 14. The pair of left and right floor frames 14 are opened in a C shape toward the rear, and a fuel tank 52 is disposed between the pair of left and right floor frames 14 and behind the front seat 1.

  The first cross member 11 is fixed between the pair of side sills 10 in front of the IPU 20 and is disposed under the floor F. The second cross member 12 is fixed between the pair of floor frames 14 behind the IPU 20 and disposed below the floor F.

  Further, the first cross member 11 and the second cross member 12 are arranged with a space in the front-rear direction, and there is a space for accommodating the IPU 20 between the first cross member 11 and the second cross member 12. Is formed.

  Then, as shown in FIG. 2, the space between the first cross member 11 and the second cross member 12 and the space above the second cross member 12 are positioned below the front seat 1. That is, the first cross member 11 and the second cross member 12 are provided so as to be below the opening 3 a of the floor panel 3. Thereby, the lower part of IPU20 arrange | positioned so that the opening part 3a of the floor panel 3 may be straddled is accommodated under the floor F. FIG.

  The third cross member 13 is a gate-shaped cross member that is integrally formed with the IPU cover 4 and extends in the left-right direction along the upper surface of the IPU cover 4. More specifically, it is disposed above the rear wall 31 of the battery frame 28 disposed on the rear side of the battery 26 to be described later. Both ends of the third cross member 13 extend on the floor panel 3 and are fixed by bolts (not shown) that pass through the floor panel 3 and screw into the floor frame 14.

  The third cross member 13 is fastened with a pair of seat support members 16 extending forward from the front surface along the IPU cover 4 and fixed to the first cross member 11. The seat rail 1a of the inner leg portion of the seat 1 is fastened. Further, the seat rail 1 b of the outer leg portion of the front seat 1 is fastened to the floor panel 3. Thereby, the front seat 1 is stably supported.

  The IPU protective case 8 is fixed to the first cross member 11 and the second cross member 12 and covers the front and rear and the lower side of the IPU case 21 that accommodates the IPU 20 via a gap H, and the IPU 20 is covered with muddy water, stone, or the like. Protect.

  Next, the IPU 20 will be described. As shown in FIGS. 2 and 3, the IPU 20 includes a battery 26, high-voltage components such as a DC-DC converter and ECU (not shown), a battery frame 28 that houses the battery 26 and high-voltage components, and a cooling (not shown). It comprises a fan and a junction board, and an IPU case 21 that accommodates all of them.

  The IPU case 21 is a shallow bottom body opened upward, and as shown in FIG. 2, the rear bottom portion 21b which is the rear side bottom wall of the IPU case 21 is the front bottom portion 21a which is the front side bottom wall. It is formed so that it may become above compared with. Thereby, while the accommodation space on the rear side of the IPU case 21 is reduced in the height direction, a space in which the second cross member 12 can be disposed below the rear side of the IPU 20 is formed.

  The battery 26 is a battery for driving the electric vehicle V and is disposed on the left side of the front portion of the IPU case 21 while being accommodated in the battery frame 28. The DC-DC converter and the ECU are accommodated in the battery frame 28. In the state, it can be arranged on the front right side of the IPU case 21 so as to overlap each other. In addition, the cooling fan and the junction board can be respectively disposed at the rear of the IPU case 21, that is, behind the battery frame 28.

  The DC-DC converter steps down the voltage of the DC power supplied from the battery 26. The ECU controls various electrical equipment of the electric vehicle V. The cooling fan is a blower that has a cylindrical impeller, sucks air from one side of the impeller in the rotation axis direction, and discharges air in the tangential direction of the impeller to cool the battery 26 and the like. The junction board distributes the DC power of the battery 26 to a power drive unit and a DC-DC converter (not shown).

  The battery frame 28 includes a pair of substantially flat front walls 30 and a rear wall 31 disposed on the front and rear sides of the battery 26, and a pair of upper ends disposed on the left and right sides of the battery 26 lower than the front walls 30 and the rear walls 31. A left wall 41 and a right wall 42. The front wall 30 and the left wall 41, the front wall 30 and the right wall 42, the rear wall 31 and the left wall 41, and the rear wall 31 and the right wall 42 at the corner R, respectively. They are connected by the connecting member 50 and form a box shape as a whole.

  As shown in FIGS. 3 to 5, the pair of front wall 30 and rear wall 31 includes a flat plate portion 33 that sandwiches the front and rear surfaces of the battery 26, and diagonally outward in the vehicle width direction from the upper portions of the left and right ends of the flat plate portion 33. And an extension 34 extending downward. The flat plate portion 33 is provided with a flat plate portion bending flange 35 formed by bending the upper end portion outward with respect to the battery 26. That is, the flat plate portion bending flange 35 constitutes the upper ends of the front wall 30 and the rear wall 31 (flat plate portion 33), and the flat plate portion bending flange 35 extends forward in the flat plate portion 33 of the front wall 30. The flat plate portion 33 extends rearward. A plurality of through holes 32 are formed in the flat plate portion 33, and an end plate (not shown) of the battery 26 sandwiched between the pair of flat plate portions 33 is fixed by bolts (not shown) inserted through the through holes 32. The Thereby, the battery 26 is supported by the battery frame 28.

  The extension portion 34 is also provided with an extension portion bending flange 36 formed by bending the upper end outward with respect to the battery 26, and is continuous with the flat plate portion bending flange 35 of the flat plate portion 33. Therefore, the flat plate portion bending flange 35 of the flat plate portion 33 and the extension portion bending flange 36 of the extension portion 34 are arranged so as to have a gate shape in a front view at a position higher than the floor frame 14. A connecting member 50 formed by pressing a thin metal plate is fixed to the extension portion 34 by spot welding. The front wall 30 disposed in front of the battery 26 and the rear wall 31 disposed in the rear of the battery 26 may have different shapes depending on the convenience of component mounting.

  The extension 34 is provided with a mounting hole 22 (see FIG. 9A), to which the IPU case 21 is fixed. Therefore, the IPU case 21 is fixed in a state of being suspended in the opening 3 a of the floor panel 3 via the pair of front walls 30 and rear walls 31.

  The pair of the left wall 41 and the right wall 42 are made of a plate material whose upper and lower ends are bent outward in a U-shape, and side wall flange portions 48 and 49 are formed on the upper and lower ends of the side wall portion 47. A plurality of beads 44 protruding outward are formed on the side wall 47 so as to extend in the front-rear direction.

  The connecting member 50 that connects the wall members orthogonal to each other at each corner R has the first plate portion 54 parallel to the flat plate portion 33 and the second plate portion 55 parallel to the left wall 41 and the right wall 42 orthogonal to each other. The second plate portion 55 is formed at the outer end portion in the vehicle width direction by having an L-shaped cross section and being curved outward in the vehicle width direction by the curved portion 56 above the left wall 41 and the right wall 42. The fixed portion 57 is parallel to the floor F. The fixing portion 57 is disposed at a position lower than the upper ends of the flat plate portions 33 of the front wall 30 and the rear wall 31, and a screw hole 58 for fixing the bolt to the floor frame 14 is formed. The second plate portion 55 is wider toward the fixed portion 57 and is parallel to the floor F at a position higher than the fixed portion 57 on the opposite side of the first plate portion 54 across the fixed portion 57. A widened portion 59 is formed.

  As shown in FIG. 8, the first plate portion 54 parallel to the flat plate portion 33 is welded to the outer end portion in the width direction of the flat plate portion 33 at a plurality of welding points P1. A stud bolt 53 is welded to the second plate portion 55 parallel to the left wall 41 and the right wall 42 so as to protrude outward from the inner side in the vehicle width direction, and the bolt formed on the left wall 41 and the right wall 42. The left bolt 41 and the right wall 42 are fastened to the outer surface of the connecting member 50 by passing the stud bolt 53 through the hole 45 and fastening the nut 46 from the outside. Thereby, the connection member 50 couple | bonds the wall member orthogonal in each corner | angular part R. FIG.

  Further, a reinforcing piece 60 formed in a substantially crank shape in cross section with a thin metal plate is welded to the extended portion bending flange 36 of the extended portion 34 and the widened portion 59 of the connecting member 50 so as to extend. A closed cross section is formed by the portion 34, the connecting member 50, and the reinforcing piece 60 that connects both the members 34 and 55. As shown in FIGS. 6 and 7, the closed cross section S1 of the bending portion 56 is smaller than the closed cross section S2 of the fixing portion 57, and the deformation of the bending portion 56 is promoted at the time of a side collision.

  As shown in FIG. 5, the IPU 20 in which the battery 26 is supported by the battery frame 28 and accommodated in the IPU case 21 opens the floor panel 3 with the IPU case 21 attached to the front wall 30 and the rear wall 31. It is inserted into the part 3a from above. Then, the IPU 20 is fixed to the floor frame 14 with the bolts 23 via the connecting members 50 attached to the front wall 30 and the rear wall 31.

  As shown in FIG. 9A, the connecting member 50 attached to the front wall 30 is bolted to the floor frame 14 by the bolt 23 within the closed cross section S3 of the floor frame 14 in the vehicle width direction. As shown in FIG. 9B, the connecting member 50 attached to the rear wall 31 has the fixing portion 57 outside the closed cross section S3 of the floor frame 14 in the vehicle width direction and inside of the floor frame 14 in the vehicle width direction. The bolt 23 is fastened to the floor frame 14 via the reinforcing plate 74 by the bolt 23 to be fixed.

  The gate-shaped third cross member 13 is disposed above the flat plate bending flange 35 and the extension bending flange 36. However, the fixing position with respect to the floor frame 14 is different, and the third cross member 13 is fixed. Bolts are fastened to the floor frame 14 outside the portion 57 in the vehicle width direction.

  The IPU case 21 is fixed in a state where a predetermined space S is provided between the IPU case 21 and suspended in the opening 3 a of the floor panel 3. Further, the battery 26 is fixed to the floor frame 14 via the connecting member 50 while being accommodated in the battery frame 28. Thus, a predetermined space S is secured between the battery 26 and the floor frame 14 on both sides in the vehicle width direction.

  As shown in FIG. 2, the IPU 20 includes a first cross member 11 and a second cross member 12 arranged in the front-rear direction, and a third cross member 13 arranged above the first cross member 11 and the second cross member 11. It is located in a region surrounded by the cross member 12 and the third cross member 13. Further, the rear wall 31 disposed behind the battery 26 is disposed directly below the third cross member 13.

  Next, the deformation | transformation at the time of the side collision of the electric vehicle V of this embodiment is demonstrated with reference to FIG. In a normal state, as shown in FIG. 10A, the battery 26 is provided with a space S between the pair of floor frames 14 and is accommodated in the battery frame 28 via the connecting member 50. Are fixed to the floor frame 14, and are stably supported by the rigidity of the connecting member 50, the extension 34, and the reinforcing piece 60 against vibrations caused by traveling.

  And as shown in FIG.10 (b), when the big impact force P acts from the side of the electric vehicle V, the floor frame 14 may deform | transform and may move inside a vehicle. At this time, naturally, the impact force P also acts on the battery frame 28 fixed to the floor frame 14 via the connecting member 50. However, since the connecting member 50 having a relatively low rigidity is bent at the curved portion 56, the front wall 30 directly supporting the battery 26 and the flat plate portion 33 of the rear wall 31 are hardly deformed, and the influence on the battery 26 is affected. It is suppressed. The bending direction of the bending portion 56 is a predetermined direction in which the connecting member 50 extends obliquely downward (in the embodiment shown in FIG. 10B, diagonally downward to the right), so that the tip of the connecting member 50 approaches the battery 26. It is limited to. That is, the deformation direction of the connecting member 50 is controlled.

  Since the space S is provided between the floor frame 14 and the battery 26, even if the floor frame 14 is deformed, the space S is prevented from entering the space S, thereby preventing interference with the battery 26. Thereby, the DC-DC converter and ECU accommodated in the battery frame 28 together with the battery 26 and the battery 26 can be protected from a side collision.

  In addition, when the extension portion bending flange 36 is deformed due to a side collision, the third cross member 13 welded to the upper surface of the IPU cover 4 is also deformed by the curved portion, so that the third cross member 13 is also a curved portion. Moving upward, a deformation allowable space T of the curved portion 56 of the battery frame 28 is formed on the side opposite to the collision side. Thereby, the deformation of the bending flange 36 is promoted, the clearance between the IPU cover 4 and the battery 26 can be maintained, and interference can be avoided.

  Further, the IPU 20 is surrounded by the first, second and third cross members 11, 12 and 13 and is disposed in a region where the rigidity and strength of the vehicle body in the vehicle width direction are high. It can protect more reliably.

  As described above, according to the present embodiment, the connecting member 50 that joins the wall members orthogonal to each other at the corner R of the battery frame 28 has an L-shaped cross section and is higher than the left wall 41 and the right wall 42. In the case of a side collision, there is a curved portion 56 that is curved outward in the width direction and a fixing portion 57 that is coupled to the floor frame 14 that is lower than the upper ends of the front wall 30 and the rear wall 31 via the curved portion 56. Even if it exists, the curved part 56 deform | transforms and the movement of the battery 26 in the vehicle width direction can be prevented. Further, since the connecting member 50 reinforces the corner portion R of the battery frame 28, the rigidity of the battery frame 28 can be increased.

  Further, the extension portion bending flange 36 of the extension portion 34 is continuous with the upper ends of the front wall 30 and the rear wall 31 to form a closed cross section with the extension portion 34, the connecting member 50, and the reinforcing piece 60. Since the cross section S1 is smaller than the closed cross section S2 of the fixing portion 57, it is possible to promote the deformation of the bending portion 56 and to increase the support strength of the battery 26 at the time of a side collision.

  Further, since the flat plate bending flange 35 and the extension bending flange 36 are configured to have a gate shape in front view at a position higher than the floor frame 14, the floor frame 14 is deformed to the battery 26 side at the time of a side collision. However, the double bent flanges 35 and 36 of the gate shape support the load in the vehicle width direction, and then the curved portion 56 is deformed, so that damage to the battery 26 can be suppressed.

  In addition, the left wall 41 and the right wall 42 are formed of a plate material having both ends bent in a U-shape on the outside and a bead 44 projecting outward is formed to extend in the front-rear direction. Since 42 is fastened to the outer surface of the connecting member 50, the side collision strength of the left wall 41 and the right wall 42 of the battery frame 28 can be increased, and the rigidity of the battery frame 28 as a frame can be improved. Moreover, since the front wall 30 and the rear wall 31 are also plate materials, the weight can be reduced.

  The connecting member 50 is welded to the front wall 30 and the rear wall 31 and further includes stud bolts 53 extending in the width direction. The connecting member 50 is a bolt hole formed in the left wall 41 and the right wall 42. Since the stud bolt 53 is passed through 45 and fastened with the nut 46, the front wall 30, the rear wall 31, the left wall 41, and the right wall 42 are joined at the corner R, so that the connecting member 50 can be easily pressed. It is easy to handle and can improve productivity.

  Further, the gate-shaped third cross member 13 coupled to the floor frame 14 is disposed above the extension portion bending flange 36 outside the fixing portion 57 in the vehicle width direction. The third cross member 13 welded to the upper surface of the IPU cover 4 is also deformed by the curved portion, so that the third cross member 13 is also moved upward by the curved portion and is opposite to the collision side. Thus, a deformation allowable space T of the curved portion 56 of the battery frame 28 is formed. Thereby, the deformation of the bending flange 36 is promoted, the clearance between the IPU cover 4 and the battery 26 can be maintained, and interference can be avoided.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. Although an electric vehicle using only a motor as a drive source has been described as an applicable vehicle, the present invention is not limited to this and may be, for example, a hybrid vehicle.
Moreover, it is not necessary to provide the extension part 34 in both the front wall 30 and the rear wall 31, and you may provide the extension part 34 only in any one.
Further, the fixing portion 57 of the rear wall 31 may be bolted to the floor frame 14 via a flange of the floor frame 14 outside the closed cross section S3 of the floor frame 14 and inside the floor frame 14 in the vehicle width direction.

13 Third cross member (cross member)
14 Floor frame 26 Battery (drive battery)
28 Battery frame 30 Front wall (front and rear walls)
31 Rear wall (front and rear walls)
34 Extension part 35 Flat plate part bending flange 36 Extension part bending flange 41 Left wall (left and right walls)
42 Right wall (left and right walls)
44 Bead 45 Bolt hole 46 Nut 50 Connecting member 53 Stud bolt 56 Curved portion 57 Fixed portion 60 Reinforcement piece 74 Reinforcement plate R Corner portion S1 Closed cross section S2 of the curved portion Closed cross section S3 of the fixed portion V Electric vehicle ( Automobile)

Claims (7)

A battery for driving,
A battery frame for housing the drive battery, wherein the battery frame is attached to a floor frame, and is a vehicle battery mounting structure,
The battery frame connects a pair of front and rear walls positioned at the front and rear of the vehicle, a pair of left and right walls positioned at the left and right of the vehicle, and the front and rear walls and the left and right walls at corners. A connecting member,
The connecting member has an L-shaped cross section, a curved portion that is curved outward in the width direction above the left and right walls, and a fixed portion that is coupled to the floor frame that is lower than the upper ends of the front and rear walls via the curved portions. And a battery mounting structure for an automobile. The vehicle battery mounting structure of claim 1,
At least one of the pair of front and rear walls has an extension portion coupled to the connecting member,
The extension includes a bent flange bent outward with respect to the driving battery in the front-rear direction,
The bent flange is continuous with at least one upper end of the pair of front and rear walls, and forms a closed cross section with the extension portion, the connecting member, and the reinforcing piece,
An automotive battery mounting structure in which a closed cross section of the curved portion is smaller than a closed cross section of the fixed portion. The vehicle battery mounting structure of claim 2,
The floor frame to which the fixed portion is coupled from above extends in the front-rear direction to the side of the floor,
At least one of the pair of front and rear walls has a bending flange that is continuous with the bending flange of the extension,
The battery mounting structure for an automobile in which at least one of the bending flanges of the pair of front and rear walls and the bending flange of the extension portion have a gate shape in front view at a position higher than the floor frame. A battery mounting structure for an automobile according to any one of claims 1 to 3,
The left and right walls are made of a plate material that is folded outward at both ends in a U-shape, and formed on the side wall portion so that beads projecting outward extend in the front-rear direction.
The left and right walls are a battery mounting structure of an automobile that is fastened to an outer surface of the connecting member. The battery mounting structure for an automobile according to any one of claims 1 to 4,
The connecting member is welded to the front and rear walls, and further has a stud bolt extending in the width direction,
The connecting member is a battery mounting structure for an automobile, wherein the front and rear walls and the left and right walls are joined at the corners by passing the stud bolts through bolt holes formed in the left and right walls and fastening them with nuts. The vehicle battery mounting structure according to claim 2,
A battery mounting structure for an automobile, wherein a gate-shaped cross member coupled to the floor frame is disposed on the outer side in the vehicle width direction from the fixed portion above the bending flange. The vehicle battery mounting structure according to any one of claims 1 to 6,
The floor frame is opened in a C shape toward the rear of the automobile,
Fastening the fixed portion of the front wall within the closed cross section of the floor frame,
The battery mounting structure for an automobile, wherein the fixing portion of the rear wall is bolted to the floor frame via a flange or a reinforcing plate of the floor frame outside the closed cross section of the floor frame and inside the vehicle width direction of the floor frame.

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