WO2020162028A1 - Battery pack mounting structure - Google Patents

Abstract

This battery pack mounting structure is provided with: a pair of side members that are disposed in a vehicle on either sides in the vehicle width direction so as to lie parallel to the front-back direction of the vehicle; a rear floor panel that is disposed on the pair of side members so as bridge the same and that constitutes the bottom surface of a cargo compartment of the vehicle; a battery pack disposed on the rear floor panel in such a manner as to have a longitudinal direction thereof lying parallel to the vehicle width direction; and a bracket which extends in the longitudinal direction of the battery pack so as to be joined to an undersurface and both outer lateral surfaces of the battery pack and which has one end and the other end thereof fixed to the rear floor panel above the pair of the side members.

Description

Battery pack mounting structure

The present disclosure relates to a battery pack mounting structure.

Patent Document 1 discloses a high-voltage component pack mounted in the passenger compartment of an electric vehicle. The high-voltage component pack is housed in a housing recess provided in the floor panel, and is fixed to one of the side members installed on both sides in the vehicle width direction by a pair of brackets arranged at intervals in the vehicle front-rear direction. ing.

JP, 2016-177943, A

In the high-voltage component pack disclosed in Patent Document 1, when the rear part of the vehicle body is deformed to the front side during a rear collision of the vehicle body, the high-voltage component pack is pushed by the rear part of the deformed vehicle body and moves to the front side.

However, if a large-capacity battery pack seems to move easily, for example, electrolyte may leak from the battery, or the battery or electric circuit may be short-circuited, and there is room for improvement in terms of safety. It is believed that there is.

In view of the above circumstances, at least one embodiment of the present invention aims to provide a battery pack mounting structure capable of increasing the mounting strength of the battery pack.

(1) A battery pack mounting structure according to at least one embodiment of the present invention includes a pair of side members provided on both sides in the vehicle width direction along the vehicle front-rear direction, and bridged over the pair of side members. A rear floor panel constituting a bottom surface of a luggage compartment of a vehicle, a battery pack installed on the rear floor panel so that a longitudinal direction thereof extends along a vehicle width direction, and a battery pack extending in a longitudinal direction of the battery pack. And a bracket fixed to the rear floor panel at one end and the other end on the pair of side members.

According to the above configuration (1), the bracket extends in the longitudinal direction of the battery pack, is joined to the lower surface and both outer surfaces of the battery pack, and has one end and the other end on the pair of side members. Since it is fixed to the rear floor panel, the mounting strength of the battery pack can be increased.

(2) In some embodiments, in the above configuration (1), the bracket is joined to a center region in the lateral direction of the battery pack.

According to the configuration of (2) above, the bracket is fixed to the center area in the lateral direction of the battery pack, so that the battery pack can be more stably fixed to the rear floor panel. Further, the battery pack can be attached even if the orientation of the battery pack is rotated by 180°.

(3) In some embodiments, in the configuration of (1) or (2), the battery pack has a box-shaped tray having an open upper surface, and is provided inside the tray along the longitudinal direction of the tray. The inner frame is installed and joined to the tray together with the bracket.

According to the above configuration (3), the inner frame is installed inside the tray along the longitudinal direction of the tray and is joined to the tray together with the bracket, so that the inner frame, the tray and the bracket are integrated into one structure. As a result, the strength can be increased.

(4) In some embodiments, in the configuration of the above (3), the battery pack is provided with a duct that supplies air in the vehicle interior to the inside of the battery pack, and the inner frame is A pair of trays are provided so as to be separated in the lateral direction of the tray.

According to the configuration of (4) above, since the pair of inner frames are provided so as to be separated in the lateral direction of the tray, the air supplied from the duct flows through the space between the inner frames and the battery pack The inside of can be cooled effectively.

(5) In some embodiments, in the configuration of (3) or (4), the rear floor panel has a recess in which the battery pack is housed and a flat surface provided on both sides of the recess in the vehicle width direction. And flanges provided around the opening on both sides in the longitudinal direction of the tray are fixed to the flat portion via the bracket.

According to the configuration of (5) above, the flanges provided around the opening on both sides in the longitudinal direction of the tray are fixed to the flat portion via the bracket, so that the joint strength of the tray to the rear floor panel can be increased. .. As a result, the battery pack is stably positioned and good fixing is maintained.

(6) In some embodiments, in the configuration of (4), one end of the bracket is arranged immediately below the duct.

According to the configuration of (6) above, since the one end of the bracket is arranged directly below the duct, the duct is protected by the bracket. As a result, it is possible to avoid the collapse of the duct even when the vehicle has a side collision.

(7) In some embodiments, in any one of the above configurations (1) to (6), the bracket is installed between a pair of tire wheel houses provided on both sides in the vehicle width direction.

According to the above configuration (7), since the bracket is installed between the pair of tire wheel houses provided on both sides in the vehicle width direction, the vehicle twist can be suppressed.

According to at least one embodiment of the present invention, the mounting strength of the battery pack can be increased.

FIG. 1 is a perspective view schematically showing a vehicle in which a battery pack mounting structure according to an embodiment of the present invention is adopted. It is a perspective view which shows roughly the attachment structure of the battery pack which concerns on one Embodiment of this invention. FIG. 3 is a perspective view schematically showing the battery pack shown in FIG. 2. FIG. 3 is a plan view showing a mounting structure of the battery pack shown in FIG. 2, showing a state in which a cover of the battery pack is removed. FIG. 5 is a sectional view taken along line VV showing the attachment structure of the battery pack shown in FIG. 4. FIG. 5 is a sectional view taken along line VI-VI showing a mounting structure of the battery pack shown in FIG. 4. FIG. 3 is an enlarged perspective view showing the battery pack shown in FIG. 2 and a duct attached to the battery pack.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative positions, and the like of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Absent.

FIG. 1 is a diagram schematically showing a vehicle 1 in which a mounting structure for a battery pack 2 according to an embodiment of the present invention is adopted.

As shown in FIG. 1, a vehicle 1 in which a mounting structure for a battery pack 2 according to an embodiment of the present invention is adopted is a vehicle in which the battery pack 2 is mounted, and is, for example, an electric vehicle (EV) or a hybrid. It is an electric vehicle such as an automobile (HV) and a plug-in hybrid vehicle (PHV, PHEV).

FIG. 2 is a perspective view schematically showing a mounting structure of the battery pack 2 according to the embodiment of the present invention. FIG. 3 is a perspective view schematically showing the battery pack 2 shown in FIG. FIG. 4 is a plan view showing a mounting structure of the battery pack 2 shown in FIG. 2, and is a view showing a state where the cover 22 of the battery pack 2 is removed. 5 is a sectional view taken along line VV of the attachment structure of the battery pack 2 shown in FIG. 4, and FIG. 6 is a sectional view taken along line VI-VI of the attachment structure of the battery pack 2 shown in FIG. is there. FIG. 7 is an enlarged perspective view showing the battery pack 2 shown in FIG. 2 and the duct 6 provided in the battery pack 2.

A vehicle 1 in which a battery pack 2 mounting structure according to an embodiment of the present invention is adopted is a vehicle in which the battery pack 2 is mounted on the rear side in the vehicle front-rear direction, and a rear bumper (Fig. The tire wheel house 14 is provided on the front side of the rear bumper and on both sides in the vehicle width direction. As shown in FIG. 2, a vehicle 1 in which a mounting structure for a battery pack 2 according to an embodiment of the present invention is adopted is, for example, a luggage compartment provided behind a vehicle compartment in the vehicle front-rear direction. Tire wheel houses 14 are arranged on both sides in the width direction.

The vehicle 1 in which the battery pack 2 mounting structure according to the embodiment of the present invention is adopted is a vehicle in which the battery pack 2 is installed on the floor panel 12, and the battery pack according to the embodiment of the present invention. The vehicle 1 in which the two mounting structure is adopted includes a pair of side members 11 (see FIG. 5) and a floor panel 12, in addition to the rear bumper and the tire wheel house 14 described above.

The pair of side members 11 are frame members that form the vehicle 1, and are provided inside the tire wheel house 14 along the vehicle front-rear direction. As shown in FIG. 5, the pair of side members 11 are groove-shaped skeleton members each having an open upper surface, and are provided seamlessly by, for example, pressing a single steel plate. The pair of side members 11 gradually expands from the lower surface toward the opening on the inner side in the vehicle width direction, has a flange extending toward the inner side in the vehicle width direction at an edge portion on the inner side in the vehicle width direction of the opening, and has a vehicle width in the opening. A flange extending upward is provided at the outer edge in the direction.

The floor panel 12 is a floor member that constitutes the floor of the vehicle 1, is laid over the pair of side members 11 described above, and defines a vehicle compartment and a luggage compartment in an area above the floor panel 12. The floor panel 12 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), or a rear floor panel 123 depending on a division position in the vehicle front-rear direction. The center floor panel constitutes the floor surface of the passenger compartment, and the rear floor panel 123 constitutes the bottom surface of the luggage compartment. Each of these floor panels is provided seamlessly, for example, by pressing a single steel plate.

In the vehicle 1 in which the mounting structure of the battery pack 2 according to the embodiment of the present invention is adopted, the battery pack 2 is arranged on the rear floor panel 123, which is the rear side in the vehicle front-rear direction, so that its longitudinal direction is along the vehicle width direction. Is installed.

In the rear floor panel 123, a large area on the inner side in the vehicle width direction is recessed downward. As shown in FIG. 4, the area on the front side in the vehicle front-rear direction of the large recessed area is the installation area 123A of the battery pack 2. .. In addition, a pair of reinforcements (not shown) are installed in regions 123B on both sides in the vehicle width direction corresponding to the installation region 123A of the battery pack 2 on the rear floor panel 123. The pair of reinforcements are members that reinforce the rear floor panel 123 and are arranged along the vehicle front-rear direction. The pair of reinforcements are installed on the lower surface of the rear floor panel 123, and are housed in the space closed by the pair of side members 11 and the rear floor panel 123 described above. As a result, the pair of reinforcements are installed in the region of the rear floor panel 123 that overlaps the pair of side members 11.

Further, as shown in FIG. 5, the rear floor panel 123 has a flange extending upward at each of the edges on both sides in the vehicle width direction. The flange extending upward of the rear floor panel 123 is joined to the flange extending upward of the side member 11 by spot welding. Further, the flange extending inward in the vehicle width direction of the side member 11 is joined to the rear floor panel 123 by spot welding.

As a result, in the rear floor panel 123, the installation area 123A of the battery pack 2 becomes the recess 124 in which the battery pack 2 is housed, and both side edges of the rear floor panel 123 that close the opening of the side member 11 are provided in the vehicle width direction of the recess 124. Becomes the flat part 125.

As shown in FIG. 2, in the vehicle 1 in which the battery pack 2 mounting structure according to the embodiment of the present invention is adopted, the cross member 16 is provided on the upper surface of the boundary portion between the center floor panel and the rear floor panel 123. Like the pair of side members 11 described above, the cross member 16 is a skeleton member that constitutes the vehicle 1, and is provided along the vehicle width direction. The cross member 16 is a groove-shaped skeleton member having an open lower surface, and is provided seamlessly by, for example, pressing a single steel plate. The cross member 16 has a flange extending toward the front side in the vehicle front-rear direction at the edge of the opening in the vehicle front-rear direction, and a flange extending toward the rear side in the vehicle front-rear direction at the edge of the opening in the vehicle front-rear direction. Have. One end of the cross member 16 is fixed to the rear floor panel 123 on one of the pair of side members 11, and the other end of the cross member 16 is fixed to the rear floor panel 123 on the other of the pair of side members 11. The flange of the cross member 16 that extends toward the front side in the vehicle front-rear direction is joined to the center floor panel by spot welding, and the flange that extends toward the rear side of the vehicle in the vehicle front-rear direction is joined to the rear floor panel 123 by spot welding. It

As shown in FIG. 3, the battery pack 2 accommodates components such as a battery module 23 and a DC-DC converter 24 in which a plurality of battery cells (batteries) are bundled in a container formed of a tray 21 and a cover 22. (See FIG. 2).

As shown in FIG. 5, the tray 21 is a shallow box-shaped container having an open top surface and a substantially rectangular shape in plan view. The tray 21 has a uniform thickness, for example, by pressing one steel plate. The bottom surface of the tray 21 has a substantially rectangular shape in a plan view, and the central region in the lateral direction thereof slightly bulges upward along the longitudinal direction (see FIG. 6 ). The outer side surface 21B of the tray 21 is gradually (gradually) expanded from the lower surface 21A of the tray 21 toward the opening (upper surface), and the outer side surfaces 21B on both sides in the longitudinal direction and the outer side surfaces on both sides in the lateral direction are inclined. There is. A flange 21C is provided around the opening of the tray 21. The flange 21C is a portion to which the cover 22 is joined, and is provided over the entire circumference of the opening (upper surface). The flange 21C is horizontally projected outward from the opening, and a horizontal joint surface is provided on the upper surface thereof.

As shown in FIG. 6, the tray 21 has a pair of inner frames 211 inside thereof. The pair of inner frames 211 form a pair in the lateral direction of the tray 21, and are installed along the longitudinal direction of the tray 21 so as to be separated in the lateral direction of the tray 21. The inner frame 211 has a uniform thickness, for example, by bending a steel plate. The inner frame 211 has a bottom plate portion provided along the bottom surface of the tray 21 and a side plate portion that extends obliquely from the bottom plate portion and extends along the inner side surface of the tray 21. The bottom plate portion of the inner frame 211 has a joining portion where concaves and convexes are alternately continuous at a position facing the center region in the lateral direction of the tray 21 that is raised on the bottom surface of the tray 21. The bottom plate portion of the inner frame 211 is spot-welded to the center region in the lateral direction of the tray 21 that is raised at the bottom of the tray 21 due to the concave portion of the joint portion, and the side plate portion of the inner frame 211 is provided on the inner side surface of the tray 21. It is joined to the inclined surface by spot welding.

As shown in FIG. 3, the cover 22 is a container having substantially the same size as the tray 21, and is a shallow box-shaped container having an opening on the lower surface and a substantially rectangular shape in plan view. The cover 22 has a uniform thickness, for example, by pressing one steel plate. The upper surface of the cover 22 is substantially rectangular in plan view and has a plurality of beads (not shown) along the lateral direction thereof. The side surface of the cover 22 is gradually (gradually) expanded from the upper surface toward the opening (lower surface), and the outer side surfaces on both sides in the longitudinal direction and the outer side surfaces on both sides in the lateral direction are inclined. A flange 22C is provided around the opening of the cover 22. The flange 22C is a portion joined to the tray 21, and is provided over the entire circumference of the opening (lower surface). The flange 22C is horizontally projected outward from the opening, and a horizontal joint surface is provided on the lower surface thereof.

For example, the cover 22 includes a plurality of nuts (weld nuts) (not shown) provided on the lower surface of the flange 21C of the tray 21 with bolts (not shown) penetrating the plurality of holes provided in the flange 22C of the cover 22. It is attached to the tray 21 by fastening it.

As shown in FIG. 3, a plurality of brackets 31, 32, 33, 34 (see FIG. 4) are joined to the battery pack 2 described above.

The first bracket 31 among the plurality of brackets extends in the longitudinal direction of the tray 21 and is joined to the lower surface 21A of the tray 21 and the outer side surfaces 21B on both sides. As a result, the first bracket 31 is joined to the lower surface 2A of the battery pack 2 and the outer side surfaces 2B on both sides. The first bracket 31 has a uniform thickness, for example, by pressing a single steel plate. The first bracket 31 is curved along the lower surface of the tray 21 in the lateral direction central region and the outer side surfaces on both sides of the tray 21 (see FIGS. 5 and 6). As shown in FIG. 6, the cross-section of the first bracket 31 is corrugated with a small protrusion in the center of the large depression and has outwardly extending flanges on opposite sides of the large depression. The first bracket 31 is installed along the lower surface of the tray 21 in the lateral direction central area where the bottom surface of the tray 21 is raised and the outer side surfaces on both sides, and the flange of the first bracket 31 together with the bottom plate portion of the inner frame 211. It is joined to the tray 21 by spot welding. Further, the flange of the first bracket 31 is joined to the flange 21C provided around the opening of the tray 21 by spot welding (see FIG. 4).

As shown in FIG. 3, the second bracket 32 and the third bracket 33 among the plurality of brackets are the short ones of the tray 21 which are the front side in the vehicle front-rear direction when the battery pack 2 is installed on the rear floor panel 123. It is installed with a space on one side in the hand direction. The second bracket 32 and the third bracket 33 extend in the lateral direction of the tray 21 and are joined to the outer side surface of the tray 21 on one side in the lateral direction. The second bracket 32 and the third bracket 33 have a uniform thickness, for example, by pressing one steel plate. The second bracket 32 and the third bracket 33 are curved along the outer side surface of the tray 21. The cross sections of the second bracket 32 and the third bracket 33 are, like the cross section of the first bracket 31, a corrugated shape having a small protrusion in the center of the large recess, and a flange extending outward on both sides of the large recess. Have. One end portions of the second bracket 32 and the third bracket 33 are installed on one side in the lateral direction of the tray 21 with a space therebetween, and are joined to the tray 21 by spot welding.

As shown in FIG. 4, the fourth bracket 34 of the plurality of brackets is on the other side in the lateral direction of the tray 21, which is the vehicle front-rear direction rear side when the battery pack 2 is installed on the rear floor panel 123. It is installed in the center. The fourth bracket 34 extends in the lateral direction of the tray 21 and is joined to the outer side surface of the tray 21 on the other side in the lateral direction. The fourth bracket 34 has a uniform thickness by, for example, pressing. The fourth bracket 34 is curved along the outer side surface of the tray 21 so that its upper surface is concave. The cross section of the fourth bracket 34, like the cross section of the first bracket 31, is corrugated with a small protrusion in the center of the large recess, and has outwardly extending flanges on both sides of the large recess. One end portion of the fourth bracket 34 is installed at substantially the center of the tray 21 on the other side in the lateral direction, and is joined to the tray 21 by spot welding.

The battery pack 2 (tray 21) to which the plurality of brackets 31, 32, 33, 34 are joined is installed on the rear floor panel 123 in the longitudinal direction along the vehicle width direction. As described above, the rear floor panel 123 has a large region on the inner side in the vehicle width direction that is recessed downward, and the lower half of the battery pack 2 (the portion of the tray 21) is recessed below the rear floor panel 123. It is housed in the area on the front side in the direction (installation area 123A of the battery pack 2) (see FIG. 2). As a result, the lower surface 2A (21A) of the battery pack 2 (tray 21) faces the bottom surface of the recessed area of the rear floor panel 123, and the outer side surfaces 2B (21B) on both sides of the battery pack 2 (tray 21) are the rear floor. Opposite the inner side surfaces on both sides of the recessed area of the panel 123.

The first bracket 31 joined to the battery pack 2 (tray 21) has one end portion 31A and the other end portion 31B on the pair of side members 11 inside the tire wheel house 14 arranged on both sides in the vehicle width direction. Are fixed to the rear floor panel 123, respectively. For example, in the first bracket 31, bolts penetrating through the holes provided in the one end portion 31A and the other end portion 31B of the first bracket 31 are attached to nuts (weld nuts) provided on the lower surface of the rear floor panel 123. By fastening, it is fixed to the rear floor panel 123.

With this, the flanges 21C provided around the opening on both sides in the longitudinal direction of the tray 21 are fixed to the flat portion 125 of the rear floor panel 123 via the first bracket 31.

The other ends of the second bracket 32 and the third bracket 33 joined to the battery pack 2 (tray 21) are fixed to the cross member 16. For example, the other end portions of the second bracket 32 and the third bracket 33 are provided at the cross member 16 with bolts penetrating holes provided at the other end portions of the second bracket 32 and the third bracket 33, respectively. It is fixed to the cross member 16 by being fastened to the provided screw hole.

The other end of the fourth bracket 34 joined to the battery pack 2 (tray 21) is fixed to the rear floor panel 123. For example, at the other end of the fourth bracket 34, a bolt passing through a hole provided at the other end of the fourth bracket 34 may be fastened to a nut (weld nut) provided on the lower surface of the rear floor panel 123. Fixed by.

Further, as shown in FIG. 7, the battery pack 2 is provided with a duct 6. The duct 6 is for supplying the air in the passenger compartment to the battery pack 2, and the one end portion 31A of the first bracket 31 is arranged immediately below the duct 6. Further, the duct 6 is provided along a side panel (not shown) that partitions the vehicle compartment. For example, the duct 6 includes a horizontal portion 61 connected to the battery pack 2 and extending from the battery pack 2 toward the side panel, and an upright portion 62 connected to the horizontal portion 61 and extending along the side panel.

In the mounting structure of the battery pack 2 according to the embodiment of the present invention, as described above, the first bracket 31 extends in the longitudinal direction of the battery pack 2 (tray 21) and the lower surface 2A of the battery pack 2 (tray 21). (21A) and the outer side surfaces 2B (21B) on both sides, and one end 31A and the other end 31B of the pair of side members 11 are fixed to the rear floor panel 123, respectively. Therefore, the first bracket 31 can increase the mounting strength of the battery pack 2.

In the mounting structure of the battery pack 2 according to the embodiment of the present invention, the first bracket 31 is joined to the center region in the lateral direction of the battery pack 2 (tray 21) as described above. Therefore, the battery pack can be more stably fixed to the rear floor panel 123. Further, the battery pack 2 can be fixed to the rear floor panel 123 even if the battery pack 2 is rotated 180°.

In the battery pack 2 mounting structure according to the embodiment of the present invention, as described above, in the battery pack 2, the inner frame 211 is installed inside the tray 21 along the longitudinal direction of the tray 21, and the tray 21 together with the bracket. To be joined. Therefore, the inner frame 211, the tray 21, and the bracket are integrated, and the strength can be increased as one structure. Further, by mounting the battery module or the like on the inner frame 211, the fixation thereof becomes firm.

In the battery pack 2 mounting structure according to the embodiment of the present invention, as described above, the battery pack 2 has the pair of inner frames 211 provided so as to be separated from each other in the lateral direction of the battery pack 2. The air supplied from the duct 6 flows through the space between the inner frames 211, and the inside of the battery pack 2 can be effectively cooled.

In the attachment structure of the battery pack 2 according to the embodiment of the present invention, the flanges 21C provided around the opening on both sides in the longitudinal direction of the tray 21 have the flat portion 125 via the first bracket 31 as described above. Since it is fixed to the rear floor panel 123, the joint strength of the tray 21 to the rear floor panel 123 can be increased. Thereby, the battery pack 2 is stably positioned, and good fixation is maintained.

In the vehicle 1 in which the attachment structure of the battery pack 2 according to the embodiment of the present invention is adopted, as described above, since the one end portion 31A of the first bracket 31 is arranged immediately below the duct 6, the first bracket 31 is provided. The bracket 6 protects the duct 6. As a result, even if the vehicle 1 collides with the side surface, the collapse of the duct can be avoided.

In the vehicle 1 in which the attachment structure of the battery pack 2 according to the embodiment of the present invention is adopted, the first bracket 31 is provided between the pair of tire wheel houses 14 provided on both sides in the vehicle width direction as described above. It is installed. Therefore, the twist of the vehicle 1 can be suppressed.

The present invention is not limited to the above-described embodiment, and includes a form in which the above-described embodiment is modified and a form in which these forms are appropriately combined.

DESCRIPTION OF SYMBOLS 1 vehicle 11 side member 12 floor panel 123 rear floor panel 123A battery pack installation area 123B vehicle width direction side areas corresponding to battery pack installation area 124 recess 125 flat portion 14 tire wheel house 16 cross member 2 battery pack 2A bottom surface 2B Outer side surface 21 Tray 21A Lower surface 21B Outer side surface 21C Flange 211 Inner frame 22 Cover 22C Flange 23 Battery module 24 DC-DC converter 31 First bracket (bracket)
31A One end 31B The other end 32 Second bracket 33 Third bracket 34 Fourth bracket 6 Duct

Claims (7)

A pair of side members provided on both sides in the vehicle width direction along the vehicle front-rear direction,
A rear floor panel that is bridged over the pair of side members and constitutes the bottom surface of the luggage compartment of the vehicle,
On the rear floor panel, a battery pack whose longitudinal direction is installed along the vehicle width direction,
A bracket extending in the longitudinal direction of the battery pack, joined to a lower surface of the battery pack and outer side surfaces on both sides, and one end and the other end of the pair of side members being fixed to the rear floor panel, respectively. A mounting structure for a battery pack, comprising: The mounting structure for a battery pack according to claim 1, wherein the bracket is joined to a center area in the lateral direction of the battery pack. The battery pack is
A box-shaped tray with an open top,
The battery pack mounting structure according to claim 1 or 2, further comprising: an inner frame installed inside the tray along a longitudinal direction of the tray and joined to the tray together with the bracket. The battery pack is provided with a duct for supplying the air in the vehicle interior to the inside of the battery pack,
The battery pack mounting structure according to claim 3, wherein a pair of the inner frames are provided so as to be separated from each other in a lateral direction of the tray. The rear floor panel has a recess for accommodating the battery pack, and flat portions provided on both sides of the recess in the vehicle width direction,
The battery pack mounting structure according to claim 3 or 4, wherein flanges provided around the opening on both sides in the longitudinal direction of the tray are fixed to the flat portion via the bracket. The battery pack mounting structure according to claim 4, wherein one end of the bracket is arranged immediately below the duct. The battery pack mounting structure according to any one of claims 1 to 6, wherein the bracket is installed between a pair of tire wheel houses provided on both sides in the vehicle width direction.

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