JP2022038118A - Mounting structure for battery pack - Google Patents

Abstract

To provide a mounting structure for a battery pack by which, even in the event that a vehicle is struck from behind, a battery pack mounted on a rear floor panel can be protected while an amount of projection of the battery pack into a vehicle cabin is restricted.SOLUTION: A mounting structure for a battery pack includes: a front-side member fixed so as to overlap an upper surface and a rear surface of a cross member extending along a vehicle width direction; a rear-side member provided along the vehicle width direction behind the front-side member in the forward and backward direction; a central member provided along the forward and backward direction of the vehicle in the central area in the width direction, one end of which is supported by the front-side member and the other end of which is supported by the rear-side member; and a first support frame bridged between the front-side member and the rear-side member at the side of the central member, forming a mounting area for a battery pack, and disposed at an angle such that the front side of the battery pack in the forward and backward direction is higher than the rear side thereof.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a battery pack mounting structure.

Patent Document 1 discloses a mounting structure of a battery pack. In such a battery pack mounting structure, the battery pack is mounted above the rear floor panel. The front part of the battery pack is located above the front cross member provided in the front-rear direction of the battery pack, and the rear part of the battery pack is the front side of the rear cross member provided in the front-rear direction of the battery pack. It is arranged so as to be located in.

Japanese Unexamined Patent Publication No. 2019-188835

In the battery pack mounting structure disclosed in Patent Document 1, since the front part of the battery is located above the front cross member, the battery pack protrudes greatly into the vehicle interior, and the space inside the vehicle interior cannot be effectively utilized. ..

In view of the above circumstances, at least one embodiment of the present invention is a battery mounted on the rear floor panel even when the vehicle is rear-mounted while suppressing the amount of protrusion of the battery pack into the vehicle interior. The purpose is to provide a mounting structure for the battery pack that can protect the pack.

The mounting structure of the battery pack according to the embodiment of the present invention is a mounting structure of the battery pack in which the battery pack is mounted above the rear floor panel, and the upper surface and the rear surface of the cross member extending along the vehicle width direction. A front member fixed so as to overlap with the vehicle, a rear member provided along the vehicle width direction behind the front member in the vehicle front-rear direction, and a rear member provided along the vehicle front-rear direction in the vehicle width direction central region. One end is supported by the front member and the other end is supported by the rear member, and one side of the center member is bridged between the front member and the rear member of the battery pack. It includes a first support frame that forms a mounting area and is inclined so that the front side of the battery pack in the vehicle front-rear direction is higher than the rear side.

According to the above configuration, since the battery pack mounting area is provided between the front member and the rear member, the amount of protrusion of the battery pack into the vehicle interior can be suppressed. Further, since one end of the central member is supported by the front member and the other end is supported by the rear member, the distance between the front member and the rear member is secured by the center member even when the vehicle is rear-struck. The battery pack mounted in the mounting area of the battery pack is protected. In addition, since the first support frame is tilted so that the front side of the battery pack mounted in the mounting area of the battery pack is higher than the rear side in the vehicle front-rear direction, the battery pack crosses when the vehicle is rear-struck. Get over the members. This makes it difficult for the battery pack to be pinched between the cross member and the body, thus protecting the battery pack.

In one embodiment, in the above configuration, the front member is fixed only on the upper surface of the cross member.

According to the above configuration, since the front member is fixed only on the upper surface of the cross member, the front member is turned up when the vehicle is hit backward, and the battery pack can easily get over the cross member. This makes it difficult for the battery pack to be pinched between the cross member and the body, so that the battery pack can be protected more reliably.

In one embodiment, in the above configuration, the rear member is bridged and fixed to side members provided along the vehicle front-rear direction on both sides in the vehicle width direction.

According to the above configuration, the rear member is bridged and fixed to the side members provided along the vehicle front-rear direction on both sides in the vehicle width direction, so that the rear member is impacted when the vehicle is rear-struck. Receive it and convey it to the side members. As a result, the impact caused by the rear collision of the vehicle is alleviated, and the deformation of the rear member is alleviated. As a result, the battery pack is less likely to be pinched between the cross member and the body, so that the battery pack can be protected more reliably.

In one embodiment, in the above configuration, one end of the central member is supported by the upper surface and the rear surface of the front member, and the other end is supported by the front surface and the lower surface of the rear member.

According to the above configuration, one end of the central member is supported by the upper surface and the rear surface of the front side member, and the other end is supported by the front surface and the lower surface of the rear side member. It will be easier to turn up and the battery pack will be easier to get over the cross member. This makes it difficult for the battery pack to be pinched between the cross member and the body, so that the battery pack can be protected more reliably.

In one embodiment, in the above configuration, the central member has a higher rigidity than the first support frame.

According to the above configuration, even if the vehicle is hit backward, the battery pack mounting area is secured by the central member, so that the battery pack can be protected more reliably.

In one embodiment, in the above configuration, the electric device is bridged between the front member and the rear member on the other side of the central member to form a mounting area for the electric device, and the electric device is moved in the front-rear direction of the vehicle. It comprises a second support frame that is arranged so as to be installed horizontally along it.

According to the above configuration, since the second support frame is arranged so that the electric equipment mounted in the mounting area of the electric equipment is horizontally installed, the installation height of the electric equipment can be suppressed and the space can be saved. Can be achieved.

According to at least one embodiment of the present invention, it is possible to protect the battery pack mounted on the rear floor panel even when the vehicle is rear-struck, while suppressing the amount of protrusion of the battery pack into the vehicle interior.

It is a side view which shows roughly the mounting structure of the battery pack which mounted the battery pack. FIG. 3 is a plan view schematically showing a mounting structure of the battery pack on which the battery pack shown in FIG. 1 is mounted. It is a perspective view schematically showing the mounting structure of the battery pack shown in FIGS. 1 and 2. FIG. 3 is a plan view schematically showing the mounting structure of the battery pack shown in FIG. It is a VV line sectional view of the mounting structure of the battery pack shown in FIG. It is a perspective view schematically showing the central member shown in FIG. It is a schematic diagram schematically showing the mounting structure of the battery pack on which the battery pack is mounted, and is a diagram showing a state before the vehicle is rear-mounted. It is a schematic diagram schematically showing the mounting structure of the battery pack on which the battery pack is mounted, and is a diagram showing a state when the vehicle is rear-struck. It is a schematic diagram schematically showing the mounting structure of the battery pack on which the battery pack is mounted, and is a diagram showing a state when the vehicle is rear-struck.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. do not have.

FIG. 1 is a side view schematically showing a mounting structure 4 of a battery pack 2 equipped with a battery pack 2, and FIG. 2 shows a mounting structure 4 of a battery pack 2 mounted with the battery pack 2 shown in FIG. It is a top view which shows roughly.

The vehicle 1 in which the mounting structure 4 of the battery pack 2 according to the embodiment of the present invention is adopted is, for example, a vehicle called a mild hybrid, which charges electricity obtained by the deceleration energy of the vehicle while charging the vehicle. It supplies electricity to the motor (alternator) to reduce the load on the engine during acceleration.

As shown in FIGS. 1 and 2, the vehicle 1 in which the mounting structure 4 of the battery pack 2 according to the embodiment of the present invention is adopted includes a pair of side members 11 and at least one cross member 12. The pair of side members 11 and at least one cross member 12 are members constituting the skeleton of the vehicle 1. The pair of side members 11 are provided along the vehicle front-rear direction on both sides in the vehicle width direction, and at least one cross member 12 is provided along the vehicle width direction and is bridged and fixed to the pair of side members 11. To. Further, a floor panel is bridged over the pair of side members 11, and a vehicle compartment and a luggage compartment are provided above the floor panel. The floor panel is generally composed of a plurality of floor panels, and is classified into a front floor panel (not shown), a center floor panel (not shown), and a rear floor panel 13 according to a division position in the front-rear direction of the vehicle. For example, in a sports utility vehicle (hereinafter referred to as "SUV vehicle"), a luggage compartment that also serves as a passenger compartment is provided above the rear floor panel 13, and a third row seat (hereinafter referred to as "three row seat") (not shown). ) Is installed.

At least one cross member 12 is a plurality, and the cross member 12 provided at the front end portion of the rear floor panel 13 has a groove-shaped member 121 having an open upper surface and a groove-shaped member 122 having an open lower surface, respectively. It is configured by joining to 13.

As shown in FIGS. 1 and 2, the mounting structure 4 of the battery pack 2 according to the embodiment of the present invention is for mounting the battery pack 2 above the rear floor panel 13. The battery pack 2 mounted on the mounting structure 4 of the battery pack 2 is installed, for example, in the lower region of the three-row seats of the SUV vehicle or the lower region of the luggage compartment along the vehicle width direction.

FIG. 3 is a perspective view schematically showing the mounting structure 4 of the battery pack 2 shown in FIGS. 1 and 2, and FIG. 4 schematically shows the mounting structure 4 of the battery pack 2 shown in FIG. It is a plan view. FIG. 5 is a sectional view taken along line VV of the mounting structure 4 of the battery pack 2 shown in FIG. 4, and FIG. 6 is a perspective view schematically showing the central member 43 shown in FIG.

As shown in FIG. 3, the mounting structure 4 of the battery pack 2 according to the embodiment of the present invention includes a front member 41, a rear member 42, a central member 43, and a first support frame 44, as shown in FIG. In addition, they form an H-shaped skeleton when viewed from above the vehicle.

The front member 41 is fixed so as to overlap the upper surface and the rear surface of the cross member 12 extending along the vehicle width direction. The cross section of the front member 41 crossing in the vehicle front-rear direction is formed in a staircase shape along the cross section of the cross member 12 crossing the vehicle front-rear direction (see FIG. 2). Then, the upper portion 41a of the front member 41 is fixed to the upper surface of the cross member 12, and the step portion 41c connecting the upper portion 41a and the lower portion 41b of the front member 41 is arranged along the rear surface of the cross member 12.

The front member 41 is fixed only on the upper surface of the cross member 12. For example, the front member 41 is provided with through holes (not shown) at positions that are substantially divided into three equal parts in the vehicle width direction on the front side of the upper portion 41a in the vehicle front-rear direction, and bolts 411 that penetrate these through holes are provided. The front member 41 is fixed to the cross member 12 by fitting into a screw hole (not shown) provided in the cross member 12.

The rear member 42 is provided along the vehicle width direction behind the front member 41 in the vehicle front-rear direction, and has a mounting area for the battery pack 2 between the rear member 42 and the front member 41 in the vehicle front-rear direction. The rear member 42 is bridged over the pair of side members 11 described above, and one end and the other end of the rear member 42 are fixed to the side member 11, respectively. The rear side member 42 has a groove shape with an open upper surface, is higher than the pair of side members 11 on the inner side of both ends in the vehicle width direction, and is wider in the vehicle front-rear direction at both ends in the vehicle width direction. Then, the rear side member 42 is fixed to the pair of side members 11 by bolts 421 penetrating holes (not shown) provided at both ends in the vehicle width direction.

A reinforcing member 422 is attached to the rear member 42. The reinforcing member 422 reinforces the area in the vehicle width direction corresponding to the mounting area of the battery pack 2 in the rear member 42. The reinforcing member 422 is provided along the vehicle width direction, and is provided over a portion that is about two-thirds of the left side of the vehicle corresponding to the mounting area of the battery pack 2. For example, the reinforcing member 422 has a groove shape with an open lower surface, is fitted into the upper surface opening of the rear member 42, and is attached to the rear member 42 by a bolt 423.

The central member 43 is provided along the vehicle front-rear direction in the central region in the vehicle width direction, and one end is supported by the front member 41 and the other end is supported by the rear member 42. The central member 43 has a rectangular tubular shape with a cross section larger than the vehicle width direction in the vehicle vertical direction.

As shown in FIG. 5, one end (front end) of the central member 43 is supported by the upper surface and the rear surface of the front member 41, and the other end (rear end) is supported by the front surface and the lower surface of the rear member 42. As shown in FIG. 6, the central member 43 is composed of a central member main body 431, a front bracket 432, and a rear bracket 433. The central member main body 431 is formed of a rectangular cylinder having a rectangular cross section whose cross section is larger in the vertical direction of the vehicle than in the width direction of the vehicle, and counteracts the impact force when the vehicle 1 is rear-struck. The front bracket 432 is a bracket having a groove-shaped cross section in which the lower surface into which the central member main body 431 fits is open, and is joined to one end (front end) of the central member main body 431 by welding or the like. The front bracket 432 is cut out in a rectangular shape on the lower side when viewed from the side surface of the vehicle so that one end of the central member 43 is supported by the upper surface and the rear surface of the front member 41. The rear bracket 433 is a bracket having a groove-shaped cross section with an open upper surface into which the central member main body 431 is fitted, and is joined to the other end (rear end) of the central member main body 431 by welding or the like. The rear bracket 433 is cut out in a rectangular shape on the upper side when viewed from the side surface of the vehicle so that the other end of the central member 43 is supported by the front surface and the lower surface of the rear member 42.

As shown in FIG. 5, the first support frame 44 is bridged between the front member 41 and the rear member 42 on one side of the central member 43 (for example, to the left of the vehicle), and the mounting area of the battery pack 2 is provided. Is formed, and the battery pack 2 is tilted so that the front side in the vehicle front-rear direction is higher than the rear side (see FIG. 1).

As shown in FIG. 5, two first support frames 44 are provided in the vehicle width direction along the inner wall surface of a battery tray (not shown) provided in the lower region of the mounting structure 4 of the battery pack 2. It will be provided. The two first support frames 44 have a battery mounting portion 441, a front member connecting portion 442, and a rear member connecting portion 443, respectively. The battery mounting portion 441 is a portion of the first support frame 44 extending along the vehicle front-rear direction, and includes a mounting area of the battery pack 2. The battery mounting portion 441 includes a mounting area for the battery pack 2 and an area for the rear member 42 to bend. As a result, a predetermined distance is provided between the battery pack 2 mounted on the battery mounting portion 441 and the rear member connecting portion 443, and the battery pack 2 mounted on the battery mounting portion 441 and the rear member 42 Are separated at predetermined intervals. The front member connecting portion 442 is a portion connected to the step portion 41c of the front member 41, extends from the battery mounting portion 441, and is connected to the front member 41. The rear member connecting portion 443 is a portion extending toward the rear member 42, extending from the battery mounting portion 441 and being connected to the rear member 42. The end of the rear member connecting portion 443 is connected to the lower surface of the rear member 42. The rigidity of the central member 43 described above is higher than the rigidity of these two first support frames 44, and the central member 43 secures a mounting area for the battery pack 2 even when the vehicle 2 is rear-mounted. Therefore, the battery pack 2 can be protected more reliably.

FIG. 7 is a schematic diagram schematically showing a mounting structure 4 of the battery pack 2 on which the battery pack 2 is mounted, and FIG. 7-1 is a diagram and a diagram showing a state before the vehicle 1 is rear-mounted. 7-2 and FIG. 7-3 are diagrams showing a state when the vehicle 1 is rear-struck.

As shown in FIG. 7-1, before the vehicle 1 is rear-collided, the front member 41 is fixed so as to overlap the upper surface and the rear surface of the cross member 12, and the rear member 42 is between the front member 41. Secure a mounting area for the battery pack 2. Further, one end (front end) of the central member 43 is supported by the front member 41, and the other end (rear end) is supported by the rear member 42. Further, the first support frame 44 is inclined so that the front side of the battery back in the vehicle front-rear direction is higher than the rear side, and is bridged between the front member 41 and the rear member 42, and the battery pack 2 is placed in the front and rear of the vehicle. It is mounted so that the front side in the direction is higher than the rear side.

As shown in FIG. 7-2, when the vehicle 1 is hit backward, the rear member 42 is deformed to the front side in the vehicle front-rear direction, and the force applied to the rear member 42 is applied to the rear member 42 via the central member 43. And to the cross member 12. As a result, the cross sections of the front member 41 and the cross member 12 collapse, and the battery pack 2 mounted on the first support frame 44 moves forward.

As shown in FIG. 7-3, when the rear member 42 is further deformed to the front in the vehicle front-rear direction, the front member 41 is turned up from the cross member 12 by the force transmitted to the front member 41 via the center member 43, and the second member is turned up. 1 The support frame 44 moves further forward. As a result, the battery pack 2 mounted on the first support frame 44 gets over the cross member 12 and moves to the front of the vehicle.

According to the mounting structure 4 of the battery pack 2 according to the embodiment of the present invention described above, since the mounting area of the battery pack 2 is provided between the rear member 42 and the front member 41, the battery pack 2 can be mounted in the vehicle interior. The amount of protrusion can be suppressed. Further, since one end of the central member 43 is supported by the front member 41 and the other end is supported by the rear member 42, the front member 41 and the rear side are supported by the central member 43 even when the vehicle 1 is rear-collided. The distance from the member 42 is secured, and the battery pack 2 mounted in the mounting area of the battery pack 2 is protected. Further, since the first support frame 44 is inclined so that the front side of the battery pack 2 mounted in the mounting area of the battery pack 2 in the vehicle front-rear direction is higher than the rear side, the first support frame 44 is tilted so as to be higher than the rear side. Battery pack 2 gets over cross member 12. As a result, the battery pack 2 is less likely to be sandwiched between the cross member 12 and the body, so that the battery pack 2 can be protected.

Further, since the front member 41 is fixed only on the upper surface of the cross member 12, the front member 41 is turned up when the vehicle 1 is hit backward, and the battery pack 2 can easily get over the cross member 12. As a result, the battery pack 2 is less likely to be sandwiched between the cross member 12 and the body, so that the battery pack 2 can be protected more reliably.

Further, since the rear member 42 is bridged and fixed to the side members 11 provided along the vehicle front-rear direction on both sides in the vehicle width direction, the rear member 42 receives an impact when the vehicle 1 is rear-collided. Receive and transmit to the side member 11. As a result, the impact caused by the rear collision of the vehicle 1 is alleviated, and the deformation of the rear member 42 is alleviated. As a result, the battery pack 2 is less likely to be sandwiched between the cross member 12 and the body, so that the battery pack 2 can be protected more reliably.

Further, since one end of the central member 43 is supported by the upper surface and the rear surface of the front side member 41 and the other end is supported by the front surface and the lower surface of the rear side member 42, the front side member 41 is supported by the rear collision surface of the vehicle 1. It becomes easy to turn up, and it becomes easy for the battery pack 2 to get over the cross member 12. As a result, the battery pack 2 is less likely to be sandwiched between the cross member 12 and the body, so that the battery pack 2 can be reliably protected.

As shown in FIG. 2, the vehicle 1 according to the embodiment of the present invention includes the battery pack 2 mounting structure 4 and the battery pack 2 installed on one side in the vehicle width direction with the central member 43 as a boundary. A DCDC converter 3 installed on the other side is provided. In the vehicle 1 shown in FIG. 2, the battery pack 2 is installed on the left side of the vehicle with the central member 43 as a boundary, and the DCDC converter 3 is installed on the left side of the vehicle.

The DCDC converter 3 is, for example, an electric device that converts a voltage when supplying electricity from the battery pack 2 to an electrical component, and is supported by a second support frame 45 like the battery pack 2. The second support frame 45 is bridged between the rear member 42 and the front member 41 to form a mounting area for the DCDC converter 3, and the DCDC converter 3 is arranged so as to be horizontally installed along the vehicle front-rear direction. Will be done.

As shown in FIG. 5, two second support frames 45 are provided in the vehicle width direction, and are provided along the inner wall surface of the battery tray provided in the lower region of the mounting structure 4 of the battery pack 2. The two second support frames 45 have a DCDC converter mounting portion 451 and a front member connecting portion 452, and a rear member connecting portion 453, respectively. The DCDC converter mounting portion 451 is a portion of the second support frame 45 extending along the vehicle front-rear direction, and includes a mounting area for the DCDC converter 3. The DCDC converter mounting unit 451 includes a mounting area for the DCDC converter 3 and an area for bending the rear member 42. As a result, a predetermined space is provided between the DCDC converter 3 mounted on the DCDC converter mounting unit 451 and the rear member connection unit 453, and the DCDC converter 3 mounted on the DCDC converter mounting unit 451 and the rear member are provided. It is separated from 42 at a predetermined interval. The front member connecting portion 452 is a portion connected to the lower portion 41b of the front member 41, extends from the DCDC converter mounting portion 451 and is connected to the front member 41. The rear member connecting portion 453 is a portion extending toward the rear member 42, extending from the DCDC converter mounting portion 451 and being connected to the rear member 42. Then, the rear member connecting portion 453 is connected to the lower surface of the rear member 42.

According to the mounting structure 4 of the battery pack 2 according to the embodiment of the present invention described above, the second support frame 45 is arranged so that the DCDC converter 3 mounted in the mounting area of the DCDC converter 3 is horizontally installed. Therefore, the installation height of the DCDC converter 3 can be suppressed, and space can be saved.

Further, according to the vehicle 1 according to the embodiment of the present invention described above, the battery pack 2 is arranged on one side with the central member 43 as a boundary, and the DCDC converter 3 is installed on the other side, so that the vehicle 1 is rearward. The battery pack 2 mounted on the rear floor panel 13 can be protected even if it is struck.

The present invention is not limited to the above-described embodiment, and includes a modification of the above-mentioned embodiment and a combination of these embodiments as appropriate.

1 Vehicle 11 Site member 12 Cross member 121 Groove-shaped member 122 Groove-shaped member 13 Rear floor panel 2 Battery pack 3 DCDC converter (electrical equipment)
4 Battery pack mounting structure 41 Front member 41a Upper 41b Lower 41c Step 411 Bolt 42 Rear member 421 Bolt 422 Reinforcement member 423 Bolt 43 Central member 431 Central member body 432 Front bracket 433 Rear bracket 44 First support frame 441 Battery mounting part 442 Front member connection part 443 Rear member connection part 45 Second support frame 451 DCDC converter mounting part 452 Front member connection part 453 Rear member connection part

Claims (6)

The battery pack is mounted above the rear floor panel.
A front member fixed so as to overlap the upper surface and the rear surface of the cross member extending along the vehicle width direction,
A rear member provided along the vehicle width direction behind the front member in the vehicle front-rear direction, and a rear member.
A central member provided along the vehicle front-rear direction in the central region in the vehicle width direction, one end supported by the front member and the other end supported by the rear member.
It is bridged between the front member and the rear member on one side of the center member to form a mounting area for the battery pack and is tilted so that the front side of the battery pack in the vehicle front-rear direction is higher than the rear side. The placed first support frame and
To prepare
Battery pack mounting structure. The front member is fixed only on the upper surface of the cross member.
The mounting structure of the battery pack according to claim 1. The rear member is bridged and fixed to side members provided along the vehicle front-rear direction on both sides in the vehicle width direction.
The battery pack mounting structure according to claim 1 or 2. One end of the central member is supported on the upper surface and the rear surface of the front member, and the other end is supported on the front surface and the lower surface of the rear member.
The battery pack mounting structure according to any one of claims 1 to 3. The central member has a higher rigidity than the first support frame.
The battery pack mounting structure according to any one of claims 1 to 4. On the other side of the central member, the front member and the rear member are bridged to form a mounting area for the electric device, and the electric device is arranged so as to be horizontally installed along the front-rear direction of the vehicle. With a second support frame to be
The battery pack mounting structure according to any one of claims 1 to 5.

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