JP2019209954A - Battery support structure - Google Patents

Abstract

To provide a battery support structure which eases stress concentration on a battery even if load input involving deformation of a floor panel occurs during a vehicle rear collision.SOLUTION: A battery support structure 10 is formed including: a rear surface bracket 40 supporting a rear surface lower part of a battery case 14; and an additional bracket 50 supporting a lower surface rear part of the battery case 14. A rear end part 56 of the additional bracket 50 is fixed to the rear surface bracket 40 from below. A floor panel 16 has a bending part 72 which bends downward toward the front from a position seen in a vehicle anteroposterior direction which is located between a floor surface fixing part 70 to which the rear surface bracket 40 is fixed and the rear end part 56 of the additional bracket 50.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a battery support structure that supports a battery mounted on a vehicle.

  2. Description of the Related Art Conventionally, various structures for protecting electric components including a battery from an impact caused by an obstacle collision from the rear (hereinafter referred to as a vehicle rear collision) in a vehicle equipped with a battery are known.

  FIG. 1 of Patent Document 1 discloses an arrangement structure in which a battery is mounted below the rear seat. Specifically, the rectangular parallelepiped battery has a lower surface in contact with a front portion of the floor panel and a rear surface disposed along the vertical wall portion of the floor panel.

JP2013-112210A

  However, in the arrangement structure disclosed in Patent Document 1, when the rear wall portion of the floor panel is deformed in a convex shape with respect to the front, the battery receives the load accompanying the deformation of the rear wall portion as it is from the rear surface. For example, when a component (for example, a pole column) having low impact resistance is disposed at the rear part of the battery, stress concentration occurs in the component, so that the battery is easily damaged. Thus, the above-described arrangement structure leaves room for improvement in which load input from the rear is suppressed in relation to the floor panel.

  Therefore, the present specification discloses a battery support structure that can alleviate the stress concentration on the battery even when a load input accompanied by a deformation of the floor panel occurs at the time of rearward collision of the vehicle.

  The battery support structure disclosed in this specification includes a battery case that houses a battery, a floor panel that forms a floor surface of a vehicle body on which the battery case can be mounted, and the battery case and the floor panel connected to each other. A first bracket that supports a lower rear portion of the battery case; a second bracket that supports a lower rear portion of the battery case in a state of being disposed between the battery case and the floor panel; and the floor extending in the vehicle front-rear direction. And a rear side member having a cross-sectional shape that opens upward when viewed from the vehicle front-rear direction. The rear end of the second bracket is fixed to the first bracket from the lower side. And the floor panel is between a fixed portion of the floor surface to which the first bracket is fixed and a rear end portion of the second bracket. From there the vehicle longitudinal position, it has a bent portion that is bent downwardly toward the front.

  When a load is input from the rear at the time of a vehicle rear collision, the rear side member is deformed so as to protrude upward. Then, the floor panel arranged on the upper side of the rear side member is pushed up, and the bent portion of the floor panel is deformed so as to protrude upward. Along with the deformation of the floor panel, loads are input to the rear lower portion and the lower rear portion of the battery case using the first bracket and the second bracket as load paths, respectively.

  Here, since the rear end portion of the second bracket is fixed to the first bracket from the lower side, the second bracket has a fixed portion of the floor surface to which the first bracket is fixed according to the deformation of the floor panel. It is displaced as the center of rotation and acts to push up the lower rear part of the battery case. As a result, the load input direction from the first bracket deviates, and the load on the battery case is dispersed. Thereby, even if it is a case where the load input accompanying a deformation | transformation of a floor panel arises at the time of a vehicle rear collision, the stress concentration to a battery can be relieved.

  According to the battery support structure disclosed in the present specification, stress concentration on the battery can be alleviated even when a load input accompanied by deformation of the floor panel occurs at the time of rear-end collision of the vehicle.

It is a top view which shows an example of the battery support structure in embodiment of this invention. It is a perspective view of the integrated bracket shown in FIG. It is a fragmentary view of the AA cross section in FIG. It is a state figure of the battery support structure before generation | occurrence | production of a vehicle rear collision. It is a figure which shows the state which the deformation | transformation of the battery support structure advanced at the time of vehicle rear collision. It is a figure which shows the state which the deformation | transformation of the battery support structure further advanced at the time of a vehicle rear collision.

<Configuration of Battery Support Structure 10>
FIG. 1 is a plan view showing an example of a battery support structure 10 according to an embodiment of the present invention. Hereinafter, the direction of the arrow Fr indicates the front of the vehicle, and the direction of the arrow Rr indicates the rear of the vehicle. The direction of the arrow Rh indicates the right side of the vehicle, and the direction of the arrow Lh indicates the left side of the vehicle. The direction of the arrow Up indicates the upper side of the vehicle, and the direction of the arrow Dw indicates the lower side of the vehicle.

  The battery support structure 10 can be applied to a vehicle on which the battery 12 is mounted, for example, a hybrid vehicle, a plug-in hybrid vehicle, an electric vehicle, and the like. Specifically, the battery support structure 10 includes a battery case 14, a floor panel 16, left and right rear side members 18 </ b> R and 18 </ b> L, and an integrated bracket 20.

  The battery case 14 has a substantially rectangular parallelepiped shape elongated in the vehicle width direction, and is configured to accommodate the battery 12. The battery case 14 is formed with a plurality of fastening holes for fastening bolts to the floor panel 16 or the integrated bracket 20.

  The floor panel 16 forms a floor surface on which the battery case 14 can be mounted. A frame member including rear side members 18R and 18L is joined to the lower surface or side portion of the floor panel 16.

  The rear side members 18R and 18L are extended from the rear to the front so as to bend from the inner side to the outer side in the vehicle width direction while avoiding rear wheels (not shown). The rear side members 18R and 18L have a hat-like cross-sectional shape that opens upward as viewed from the axial direction. The cross-sectional shape is not limited to a hat shape, and may be, for example, a U shape, a C shape, or a U shape opening upward.

  The front ends of the rear side members 18R and 18L are connected to the center floor cross member 24, and the rear ends of the rear side members 18R and 18L are connected to the rear bumper reinforcement 26, respectively. In addition, rear cross members 28 and 30 are connected in the vehicle width direction in order from the front so as to bridge both members between the rear side members 18R and 18L.

  In this embodiment, the battery case 14 is elongated in the vehicle width direction at a predetermined position (specifically, the center floor pan) of the floor panel 16 and has a three-pronged shape when viewed from the vehicle width direction. It is supported by the bracket 20.

  FIG. 2 is a perspective view of the integrated bracket 20 shown in FIG. The integrated bracket 20 is a support component in which a rear bracket 40 (first bracket) disposed on the rear surface side of the battery case 14 and an additional bracket 50 (second bracket) disposed on the lower surface side of the battery case 14 are integrated. It is.

  The rear bracket 40 is formed by bending a single metal plate into an L shape. The rear bracket 40 has an upper end portion 42 that extends upward and a rear end portion 44 that extends rearward in the attached state. The upper end portion 42 is formed with four fastening holes at three locations for fastening bolts to the lower rear portion of the battery case 14. The rear end portion 44 is formed with three fastening holes for bolting to the floor panel 16.

  The additional bracket 50 is formed by joining ends of two metal plate members and has a closed cross-sectional structure. The additional bracket 50 has a front end portion 52 that is one joining portion, a closed section portion 54 that forms a substantially parallelogram-shaped closed section, and a rear end portion 56 that is the other joining portion. Here, the rear bracket 40 and the additional bracket 50 are integrated by welding the rear end portion 56 of the additional bracket 50 to the outer bent surface of the rear bracket 40.

  FIG. 3 is a partial view of a cross section taken along line AA of FIG. The upper end portion 42 of the rear bracket 40 is bolted to the lower portion of the rear surface of the battery case 14, and the rear end portion 44 of the rear bracket 40 is bolted to the floor panel 16. As described above, the rear bracket 40 supports the lower portion of the rear surface of the battery case 14 by connecting the battery case 14 and the floor panel 16.

  The distal end portion 52 of the additional bracket 50 is fixed in a state of being sandwiched between the battery case 14 and the floor panel 16. On the other hand, the rear end portion 56 of the additional bracket 50 is fixed to the rear bracket 40 from below by welding or the like. Thus, the additional bracket 50 supports the lower rear surface of the battery case 14 in a state of being arranged between the battery case 14 and the floor panel 16. Here, it should be noted that the gap between the battery case 14 and the floor panel 16 is filled with the closed cross-sectional portion 54 of the additional bracket 50.

  If necessary, an elastic member such as rubber may be provided between the floor panel 16 and the additional bracket 50, or an elastic member such as rubber may be provided between the additional bracket 50 and the battery case 14. Thereby, for example, on the premise that the integrated bracket 20 that is made common regardless of the vehicle type is used, the elastic member corresponding to the vehicle type is set, so that the rigidity design in the battery support structure 10 can be easily adjusted.

  The floor panel 16 has a curved surface shape similar to the shape of the rear side members 18R, 18L. The floor panel 16 is lowered downward from the position in the vehicle front-rear direction between the portion of the floor surface to which the rear bracket 40 is fixed (hereinafter, the fixing portion 70) and the rear end portion 56 of the additional bracket 50. A bent portion 72 is bent. The bent portion 72 smoothly connects the upper flat portion 74 to which the rear bracket 40 is fixed and the lower flat portion 76 to which the additional bracket 50 is fixed.

<Operational effect of battery support structure 10>
The battery support structure 10 in this embodiment is configured as described above. Then, the effect by this battery support structure 10 is demonstrated, referring FIGS. 4-6.

  FIG. 4 is a state diagram of the battery support structure 10 before the occurrence of a vehicle rear-end collision, and corresponds to an overall view taken along the line AA of FIG. When a vehicle rear-end collision occurs from this state, the battery support structure 10 is deformed in the order shown in FIGS.

  As shown in FIGS. 5 and 6, when a load is input from the rear at the time of rearward collision of the vehicle, the left and right rear side members 18 </ b> R and 18 </ b> L are deformed so as to protrude upward. Then, the floor panel 16 disposed on the upper side of the rear side members 18R and 18L is pushed up, and the bent portion 72 of the floor panel 16 is deformed so as to protrude upward. As the floor panel 16 is deformed, loads are input to the lower rear portion and the lower rear portion of the battery case 14 using the rear bracket 40 and the additional bracket 50 as load paths, respectively.

  Here, since the rear end portion 56 of the additional bracket 50 is fixed to the rear surface bracket 40 from below, the additional bracket 50 is fixed to the floor surface to which the rear surface bracket 40 is fixed according to the deformation of the floor panel 16. The portion 70 is displaced about the center of rotation, and acts to push up the rear lower portion of the battery case 14.

  In particular, since the closed cross section formed by the additional bracket 50 fills the gap between the battery case 14 and the floor panel 16, the load from the floor panel 16 (the bent portion 72 or the lower flat portion 76) is passed through the closed cross section 54. The battery case 14 is efficiently transmitted to the rear portion of the lower surface of the battery case 14.

  As a result, the load input direction from the rear bracket 40 deviates, so that the load on the battery case 14 is dispersed. Thereby, even when a load input accompanied by deformation of the floor panel 16 occurs at the time of rear-end collision of the vehicle, stress concentration on the battery 12 can be reduced. In particular, when a component having low impact resistance (for example, the pole column 13) is disposed at the rear portion of the battery 12, damage to the battery 12 is significantly suppressed by reducing stress concentration on the pole column 13. .

  DESCRIPTION OF SYMBOLS 10 Battery support structure, 12 Battery, 14 Battery case, 16 Floor panel, 18R, 18L Rear side member, 20 Integrated bracket, 40 Rear bracket (1st bracket), 50 Additional bracket (2nd bracket), 70 Fixing part, 72 Bending Department.

Claims (1)

A battery case that houses the battery;
A floor panel forming a floor surface of a vehicle body on which the battery case can be mounted;
A first bracket that supports a lower rear portion of the battery case by connecting the battery case and the floor panel;
A second bracket that supports a rear lower portion of the battery case in a state of being arranged between the battery case and the floor panel;
A rear side member extending in the vehicle front-rear direction and disposed on the lower side of the floor panel and having a cross-sectional shape opened upward as viewed from the vehicle front-rear direction;
With
The rear end of the second bracket is fixed to the first bracket from below,
The floor panel is a bent portion that bends downward from the position in the vehicle front-rear direction between the fixed portion of the floor surface to which the first bracket is fixed and the rear end portion of the second bracket. A battery support structure comprising:

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