JP7468251B2 - Battery pack mounting structure - Google Patents

Description

This disclosure relates to a battery pack mounting structure.

Patent Document 1 discloses a battery pack mounting structure. In this battery pack mounting structure, the battery pack is mounted above the rear floor panel. The battery pack is arranged so that the front part of the battery pack is located above a front cross member provided in front of the battery pack in the vehicle's fore-and-aft direction, and the rear part of the battery pack is located in front of a rear cross member provided behind the battery pack in the vehicle's fore-and-aft direction.

JP 2019-188835 A

In the battery pack mounting structure disclosed in Patent Document 1, the front of the battery is located above the front cross member, so the battery pack protrudes significantly into the vehicle interior, making it difficult to effectively utilize the space inside the vehicle interior.

In view of the above circumstances, at least one embodiment of the present invention aims to provide a battery pack mounting structure that can protect a battery pack mounted on a rear floor panel even if the vehicle is hit from behind, while suppressing the amount of protrusion of the battery pack into the vehicle interior.

The battery pack mounting structure according to one embodiment of the present invention is a battery pack mounting structure in which a battery pack is mounted above a rear floor panel, and includes a front member fixed so as to overlap the upper and rear surfaces of a 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, a central member provided along the vehicle front-rear direction in the central region of the vehicle width direction, one end of which is supported by the front member and the other end of which is supported by the rear member, and a first support frame that spans between the front member and the rear member on one side of the central member, forms 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.

According to the above configuration, since there is a battery pack mounting area between the front member and the rear member, the amount of protrusion of the battery pack into the vehicle interior can be reduced. In addition, since one end of the central member is supported by the front member and the other end is supported by the rear member, even if the vehicle is rear-ended, the central member ensures a gap between the front member and the rear member, and the battery pack mounted in the battery pack mounting area is protected. In addition, since the first support frame is inclined so that the front side of the battery pack mounted in the battery pack mounting area is higher than the rear side in the vehicle fore-and-aft direction, the battery pack will climb over the cross member if the vehicle is rear-ended. This makes it less likely for the battery pack to be pinched between the cross member and the body, and therefore the battery pack can be protected.

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

With the above configuration, the front member is fixed only to the upper surface of the cross member, so if the vehicle is hit from behind, the front member will flip up, making it easier for the battery pack to climb over the cross member. This makes it less likely for the battery pack to be pinched between the cross member and the body, so the battery pack can be protected more reliably.

In one embodiment, in the above configuration, the rear member is fixed across side members that are provided along the vehicle front-rear direction on both sides of the vehicle width direction.

According to the above configuration, the rear member is fixed across the side members that are provided along the vehicle front-rear direction on both sides in the vehicle width direction, so that in the event of a rear-end collision, the rear member absorbs the impact and transmits it to the side members. This reduces the impact of the vehicle's rear-end collision and reduces deformation of the rear member. As a result, the battery pack is less likely to be pinched between the cross member and the body, so the battery pack can be more reliably protected.

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

According to the above configuration, one end of the central member is supported by the upper and rear surfaces of the front member, and the other end is supported by the front and lower surfaces of the rear member, so that in the event of a rear-end collision, the front member is more likely to be turned up, making it easier for the battery pack to climb over the cross member. This makes it less likely for the battery pack to be pinched between the cross member and the body, so the battery pack can be more reliably protected.

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

With the above configuration, the central member ensures that there is sufficient space to mount the battery pack even if the vehicle is hit from behind, so the battery pack can be protected more reliably.

In one embodiment, the above configuration includes a second support frame that spans the front member and the rear member on the other side of the central member, forms a mounting area for electrical equipment, and is tilted so that the front side of the electrical equipment in the fore-and-aft direction of the vehicle is higher than the rear side .

According to at least one embodiment of the present invention, the amount of protrusion of the battery pack into the vehicle interior is reduced, and the battery pack mounted on the rear floor panel can be protected even if the vehicle is hit from behind.

FIG. 2 is a side view showing a schematic diagram of a mounting structure for a battery pack. FIG. 2 is a plan view showing a schematic mounting structure of a battery pack in which the battery pack shown in FIG. 1 is mounted. FIG. 3 is a perspective view showing a schematic mounting structure of the battery pack shown in FIGS. 1 and 2 . FIG. 4 is a plan view illustrating a mounting structure of the battery pack illustrated in FIG. 3 . 5 is a cross-sectional view of the battery pack mounting structure shown in FIG. 4 taken along line VV. FIG. 6 is a perspective view showing a schematic view of the central member shown in FIG. 5 . FIG. 2 is a schematic diagram illustrating a mounting structure for a battery pack mounted thereon, showing a state before the vehicle is hit from behind; FIG. 2 is a schematic diagram illustrating a mounting structure for a battery pack mounted thereon, showing a state when a vehicle is hit from behind; FIG. FIG. 2 is a schematic diagram illustrating a mounting structure for a battery pack mounted thereon, showing a state when a vehicle is hit from behind; FIG.

Below, several embodiments of the present invention will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention and are merely illustrative examples.

Figure 1 is a side view that shows a schematic of the mounting structure 4 for the battery pack 2 that is equipped with the battery pack 2, and Figure 2 is a plan view that shows a schematic of the mounting structure 4 for the battery pack 2 that is equipped with the battery pack 2 shown in Figure 1.

The vehicle 1 in which the mounting structure 4 for the battery pack 2 according to the embodiment of the present invention is adopted is, for example, a vehicle known as a mild hybrid, which charges the battery with electricity obtained from the deceleration energy of the vehicle, while supplying electricity to the motor (alternator) to reduce the burden on the engine when the vehicle accelerates.

1 and 2, a vehicle 1 in which a mounting structure 4 for a battery pack 2 according to an 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 that constitute the framework of the vehicle 1. The pair of side members 11 are provided along the vehicle front-rear direction on both sides of the vehicle width direction, and at least one cross member 12 is provided along the vehicle width direction and is fixed by spanning the pair of side members 11. A floor panel is also spanned across the pair of side members 11, and a passenger compartment and a luggage compartment are provided above the floor panel. The floor panel is generally composed of multiple 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 the division position in the vehicle front-rear direction. For example, in a sports utility vehicle (hereinafter referred to as an "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 a "third row seat") (not shown) is installed.

There are at least one cross member 12, and the cross member 12 provided at the front end of the rear floor panel 13 is constructed by joining a groove-shaped member 121 with an open top surface and a groove-shaped member 122 with an open bottom surface to the rear floor panel 13.

As shown in Figures 1 and 2, the mounting structure 4 for 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 for the battery pack 2 is installed, for example, below the third row of seats of an SUV vehicle or below the luggage compartment along the vehicle width direction.

Figure 3 is a perspective view that shows a schematic view of the mounting structure 4 of the battery pack 2 shown in Figures 1 and 2, and Figure 4 is a plan view that shows a schematic view of the mounting structure 4 of the battery pack 2 shown in Figure 3. Figure 5 is a cross-sectional view taken along line V-V of the mounting structure 4 of the battery pack 2 shown in Figure 4, and Figure 6 is a perspective view that shows a schematic view of the central member 43 shown in Figure 5.

As shown in FIG. 3, the mounting structure 4 for 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, which form an H-shaped skeleton when viewed from above the vehicle as shown in FIG. 4.

The front member 41 is fixed so as to overlap the upper and rear surfaces of the cross member 12, which extends along the vehicle width direction. The cross section of the front member 41 that crosses the vehicle's fore-aft direction is formed in a stepped shape along the cross section of the cross member 12 that crosses the vehicle's fore-aft direction (see FIG. 2). The upper step 41a of the front member 41 is fixed to the upper surface of the cross member 12, and the step portion 41c that connects the upper step 41a and lower step 41b of the front member 41 is disposed along the rear surface of the cross member 12.

The front member 41 is fixed only to the upper surface of the cross member 12. For example, the front member 41 has through holes (not shown) at approximately three equal positions in the vehicle width direction on the front side of the upper stage 41a in the vehicle longitudinal direction, and the front member 41 is fixed to the cross member 12 by fitting bolts 411 that pass through these through holes into screw holes (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 it and the front member 41. The rear member 42 is bridged across 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 members 11. The rear member 42 is groove-shaped 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. The rear member 42 is fixed to the pair of side members 11 by bolts 421 that pass through 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 of the rear member 42 in the vehicle width direction that corresponds to the mounting area of the battery pack 2. The reinforcing member 422 is provided along the vehicle width direction, and is provided over approximately two-thirds of the left side of the vehicle that corresponds to the mounting area of the battery pack 2. For example, the reinforcing member 422 is a groove shape with an open bottom, and is fitted into the top opening of the rear member 42 and attached to the rear member 42 by bolts 423.

The central member 43 is provided along the vehicle front-rear direction in the central region in the vehicle width direction, with one end supported by the front member 41 and the other end supported by the rear member 42. The central member 43 is a square tube with a rectangular cross section that is larger in the vehicle up-down direction than in the vehicle width direction.

As shown in FIG. 5, one end (front end) of the central member 43 is supported on the upper and rear surfaces of the front member 41, and the other end (rear end) is supported on the front and lower surfaces 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 composed of a square tube with a rectangular cross section whose vertical direction is larger than the width direction of the vehicle, and resists the impact force when the vehicle 1 is hit from behind. The front bracket 432 is a bracket with a groove-shaped cross section whose 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 has a rectangular cutout on the lower side when viewed from the side of the vehicle so that one end of the central member 43 is supported on the upper and rear surfaces of the front member 41. The rear bracket 433 is a bracket with a groove-shaped cross section with an open upper surface into which the central member body 431 fits, and is joined to the other end (rear end) of the central member body 431 by welding or the like. The rear bracket 433 has a rectangular cutout at the top when viewed from the side of the vehicle so that the other end of the central member 43 is supported by the front and bottom surfaces 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 (e.g., the left side of the vehicle), forming a mounting area for the battery pack 2, and is tilted so that the front side of the battery pack 2 in the vehicle longitudinal 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 and are provided along the inner wall surface of a battery tray (not shown) provided in the lower area of the mounting structure 4 for the battery pack 2. Each of the two first support frames 44 has a battery mounting portion 441, a front member connection portion 442, and a rear member connection portion 443. The battery mounting portion 441 is a portion that extends along the vehicle front-rear direction in the first support frame 44 and includes a mounting area for the battery pack 2. The battery mounting portion 441 includes an area for bending the rear member 42 in addition to the mounting area for the battery pack 2. As a result, a predetermined interval is provided between the battery pack 2 mounted on the battery mounting portion 441 and the rear member connection portion 443, and the battery pack 2 mounted on the battery mounting portion 441 and the rear member 42 are separated by a predetermined interval. The front member connection portion 442 is a portion that is connected to the step portion 41c of the front member 41, and extends from the battery mounting portion 441 to be connected to the front member 41. The rear member connection portion 443 is a portion that extends toward the rear member 42, and extends from the battery mounting portion 441 to be connected to the rear member 42. The end of the rear member connection portion 443 is connected to the underside of the rear member 42. The rigidity of the above-mentioned central member 43 is higher than the rigidity of these two first support frames 44, and the mounting area for the battery pack 2 is secured by the central member 43 even if the vehicle 2 is hit from behind, so that the battery pack 2 can be protected more reliably.

Figure 7 is a schematic diagram showing the mounting structure 4 of the battery pack 2 on which the battery pack 2 is mounted, with Figure 7-1 showing the state before the vehicle 1 is hit from behind, and Figures 7-2 and 7-3 showing the state when the vehicle 1 is hit from behind.

As shown in FIG. 7-1, before the vehicle 1 is hit from behind, the front member 41 is fixed so as to overlap the upper and rear surfaces of the cross member 12, and the rear member 42 ensures a mounting area for the battery pack 2 between it and the front member 41. The central member 43 has one end (front end) supported by the front member 41 and the other end (rear end) supported by the rear member 42. The first support frame 44 is inclined and spans the front member 41 and rear member 42 so that the front side of the battery pack in the vehicle's fore-and-aft direction is higher than the rear side, and the battery pack 2 is mounted so that the front side in the vehicle's fore-and-aft direction is higher than the rear side.

As shown in Figure 7-2, when the vehicle 1 is hit from behind, the rear member 42 deforms forward in the vehicle's longitudinal direction, and the force applied to the rear member 42 is transmitted to the front member 41 and cross member 12 via the central member 43. This causes the cross sections of the front member 41 and cross member 12 to collapse, and the battery pack 2 mounted on the first support frame 44 moves forward.

As shown in Figure 7-3, when the rear member 42 is further deformed forward in the vehicle longitudinal direction, the force transmitted to the front member 41 via the central member 43 causes the front member 41 to turn up from the cross member 12, and the first support frame 44 moves further forward. As a result, the battery pack 2 mounted on the first support frame 44 climbs over the cross member 12 and moves forward of the vehicle.

According to the mounting structure 4 for the battery pack 2 according to the embodiment of the present invention described above, since the mounting area for the battery pack 2 is between the rear member 42 and the front member 41, the amount of protrusion of the battery pack 2 into the vehicle interior can be suppressed. In addition, 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, even if the vehicle 1 is rear-ended, the central member 43 ensures a distance between the front member 41 and the rear member 42, and the battery pack 2 mounted in the mounting area for the battery pack 2 is protected. In addition, since the first support frame 44 is inclined so that the front side of the battery pack 2 mounted in the mounting area for the battery pack 2 is higher than the rear side in the vehicle longitudinal direction, the battery pack 2 climbs over the cross member 12 when the vehicle 1 is rear-ended. As a result, the battery pack 2 is less likely to be pinched between the cross member 12 and the body, and the battery pack 2 can be protected.

In addition, since the front member 41 is fixed only to the upper surface of the cross member 12, if the vehicle 1 is hit from behind, the front member 41 will be turned up, making it easier for the battery pack 2 to climb over the cross member 12. This makes it less likely for the battery pack 2 to be pinched between the cross member 12 and the body, so the battery pack 2 can be protected more reliably.

In addition, the rear member 42 is fixed across the side members 11 that are provided along the vehicle front-rear direction on both sides of the vehicle width direction, so that when the vehicle 1 is hit from behind, the rear member 42 receives the impact and transmits it to the side members 11. This reduces the impact of the rear collision of the vehicle 1 and reduces deformation of the rear member 42. As a result, the battery pack 2 is less likely to be pinched between the cross member 12 and the body, so the battery pack 2 can be protected more reliably.

In addition, one end of the central member 43 is supported by the upper and rear surfaces of the front member 41, and the other end is supported by the front and bottom surfaces of the rear member 42, so that if the vehicle 1 is hit from behind, the front member 41 is more likely to be turned up, making it easier for the battery pack 2 to climb over the cross member 12. This makes it less likely for the battery pack 2 to be pinched between the cross member 12 and the body, so 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 mounting structure 4 for the battery pack 2 described above, the battery pack 2 installed on one side in the vehicle width direction with the central member 43 as the boundary, and the DCDC converter 3 installed on the other side. 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 the boundary, and the DCDC converter 3 is installed on the left side of the vehicle.

The DCDC converter 3 is, for example, an electrical device that converts voltage when supplying electricity from the battery pack 2 to electrical equipment, and is supported by the second support frame 45, similar to the battery pack 2. The second support frame 45 spans between the rear member 42 and the front member 41, forms a mounting area for the DCDC converter 3, and is tilted so that the front side of the DCDC converter 3 in the vehicle longitudinal direction is higher than the rear side .

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. Each of the two second support frames 45 has a DCDC converter mounting portion 451, a front member connection portion 452, and a rear member connection portion 453. The DCDC converter mounting portion 451 is a portion of the second support frame 45 that extends along the vehicle front-rear direction and includes a mounting area for the DCDC converter 3. The DCDC converter mounting portion 451 includes an area for bending the rear member 42 in addition to the mounting area for the DCDC converter 3. As a result, a predetermined interval is provided between the DCDC converter 3 mounted on the DCDC converter mounting portion 451 and the rear member connection portion 453, and the DCDC converter 3 mounted on the DCDC converter mounting portion 451 and the rear member 42 are separated by a predetermined interval. The front member connection portion 452 is a portion that is connected to the lower portion 41b of the front member 41, and extends from the DCDC converter mounting portion 451 to be connected to the front member 41. The rear member connection portion 453 is a portion that extends toward the rear member 42, and extends from the DCDC converter mounting portion 451 to be connected to the rear member 42. The rear member connection portion 453 is then connected to the lower surface of the rear member 42.

In addition, according to the vehicle 1 according to the embodiment of the present invention described above, the battery pack 2 is disposed on one side of the central member 43, and the DCDC converter 3 is installed on the other side, so that the battery pack 2 mounted on the rear floor panel 13 can be protected even if the vehicle 1 is hit from behind.

The present invention is not limited to the above-described embodiments, but also includes variations of the above-described embodiments and appropriate combinations of these embodiments.

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 stage portion 41b Lower stage portion 41c Step portion 411 Bolt 42 Rear member 421 Bolt 422 Reinforcement member 423 Bolt 43 Central member 431 Central member main body 432 Front bracket 433 Rear bracket 44 First support frame 441 Battery mounting portion 442 Front member connection portion 443 Rear member connection portion 45 Second support frame 451 DCDC converter mounting portion 452 Front member connection portion 453 Rear member connection portion

Claims (6)

A battery pack mounting structure in which a battery pack is mounted above a rear floor panel,
A front member is fixed to an upper surface and a rear surface of a cross member extending along a vehicle width direction so as to overlap the front member;
a rear member provided along the vehicle width direction behind the front member in the vehicle front-rear direction;
a central member provided along a vehicle front-rear direction in a central region in the vehicle width direction, one end of which is supported by the front member and the other end of which is supported by the rear member;
a first support frame that is bridged between the front member and the rear member on one side of the central member, forms a mounting area for a battery pack, and is inclined so that a front side of the battery pack in the vehicle front-rear direction is higher than a rear side of the battery pack;
Equipped with
Battery pack mounting structure. The front member is fixed only at the upper surface of the cross member.
The battery pack mounting structure according to claim 1. The rear member is fixed to side members provided along the vehicle front-rear direction on both sides in the vehicle width direction,
3. The battery pack mounting structure according to claim 1 or 2. The central member has one end supported by the upper surface and the rear surface of the front member, and the other end supported by 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. a second support frame that is bridged between the front member and the rear member on the other side of the central member, defines a mounting area for electric equipment, and is inclined so that a front side of the electric equipment in the vehicle longitudinal direction is higher than a rear side of the electric equipment;
The battery pack mounting structure according to any one of claims 1 to 5.

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