WO2023054076A1

WO2023054076A1 - Electric vehicle

Info

Publication number: WO2023054076A1
Application number: PCT/JP2022/035055
Authority: WO
Inventors: 陽考窪田; 雄介岡田; 憲一郎中尾; 祐太郎陸川
Original assignee: 三菱自動車工業株式会社
Priority date: 2021-09-28
Filing date: 2022-09-21
Publication date: 2023-04-06
Also published as: JPWO2023054076A1

Abstract

Provided is an electric vehicle 1 equipped with a battery pack 7 below a seat 3 and on the interior side of the vehicle from a floor panel 5, the electric vehicle comprising: left and right side sills 9; a first cross member 11, which extends in the vehicle width direction on the upper side of the floor panel, the ends of which are connected to the left and right side sills, and which is disposed in front of the battery pack; and a second cross member 13, which extends in the vehicle width direction on the upper side of the floor panel, the ends of which are connected to the left and right side sills, and which is disposed behind the battery pack, wherein one or both of the first and second cross members have a bent part 11c in a portion extending outward in the vehicle width direction from the battery pack, the bent part causing the ends of the cross member to be displaced toward the battery pack.

Description

electric vehicle

This disclosure relates to electric vehicles.

In an electric vehicle such as an electric vehicle or a hybrid vehicle having a driving motor for driving wheels, a drive battery that supplies electric power to the driving motor can be installed in a space without impairing the comfort of the passenger compartment or luggage compartment. It is placed under the seat to secure it.

For example, Patent Documents 1 to 3 show examples in which the driving battery is arranged below the seat of the vehicle. In Patent Document 1, the battery pack is held under the floor panel under the front seat in order to secure the mounting amount of the battery pack without impairing the comfortability of the passenger compartment or luggage compartment of the vehicle. It is shown that the battery pack is arranged at a position that overlaps the inner side of the floor frame made up of a pair of left and right seat rails, a front seat cross member and a rear seat cross member.

And since it is located in a position that overlaps with the inside of this floor frame, if it is mounted in a position away from the outer circumference of the vehicle body or the outer circumference of the floor panel, a collision from the front, back, left, or right may cause the outer circumference of the vehicle body or the floor panel. Even if the outer circumference deforms, the battery pack is less likely to be affected by the deformation. It has been shown that high collision safety can be ensured for battery packs.

In Patent Document 2, the battery pack is arranged under the floor panel below the front seat, and the housing of the battery pack has a frame member extending in the vehicle width direction, and both ends of this frame member are 1, the structure is supported by a floor frame by means of fixed pieces fastened to a pair of left and right floor frames arranged under the floor and extending in the longitudinal direction of the vehicle body to form a vehicle body frame member. Further, it is shown that this fixed piece is formed with a bent portion, and this bent portion bends at the time of a side collision to absorb the collision energy.

Patent Document 3 shows a vehicle lower structure that suppresses deformation of the battery. When viewed in the vehicle vertical direction, the vehicle lower structure includes a first cross member and a second cross member arranged on the front and rear sides of the battery in the vehicle front-rear direction, and arranged on both outer sides of the battery in the vehicle width direction. The battery is surrounded by a pair of rear side members that are arranged in a vertical direction. Further, at least a portion of the battery overlaps with the pair of rear side members when viewed in the vehicle width direction, and at least a portion of the battery overlaps with the first cross member and the second cross member when viewed in the vehicle front-rear direction. A structure is shown in which a first cross member, a second cross member, and a pair of rear side members, which serve as frame members of the vehicle, are present around the .

In the event of a vehicle collision, the collision load is dispersed and transmitted to the first cross member, the second cross member, and the pair of rear side members, so that the first cross member, the second cross member, and the pair of rear side members Deformation is suppressed, and the first cross member, the second cross member, and the pair of rear side members are less likely to come into contact with the battery compared to a configuration in which the battery is not housed in the housing portion, so deformation of the battery can be restrained. It is shown.

JP 2015-77896 A JP 2015-81042 A JP 2018-75878 A

As described above, Patent Literatures 1 to 3 disclose a pair of left and right battery packs arranged under the seat of the vehicle, and the periphery of the battery pack extending in the front-rear direction of the vehicle, which is a frame member of the vehicle. and the front and rear cross members extending in the vehicle width direction ensure high collision safety.

However, the collision safety is ensured by these side members and cross members by distributing and transmitting the collision load to the side members and cross members on the side opposite to the collision side, thereby suppressing the deformation of these frame members. Damage to the battery pack is prevented.

In this way, Patent Documents 1 to 3 protect the battery pack by suppressing the deformation of the skeleton members by dispersing the collision load, and actively deform a part of the skeleton members of the side members and cross members due to the collision load. There is no mention of protecting the driving battery by allowing the vehicle to absorb collision energy.

In view of the above problems, at least one embodiment of the present invention absorbs collision energy from the side of the vehicle during a side collision by deformation of a cross member that extends in the vehicle width direction adjacent to the battery pack. An object of the present invention is to provide an electric vehicle capable of preventing damage to a battery pack.

The present invention has been made to achieve the above-mentioned object, and at least one embodiment of the present invention provides a battery pack for supplying electric power to a driving motor, which is arranged below the seat of the vehicle and on the inside of the passenger compartment from the floor panel. and left and right side sills extending in the vehicle front-rear direction at ends of the floor panel in the vehicle width direction, and both ends extending in the vehicle width direction on the upper surface side of the floor panel. A first cross member connected to the left and right side sills and disposed on the front side of the battery pack; a second cross member that is connected to the side sill and arranged on the rear side of the battery pack, wherein at least one of the first cross member and the second cross member is outside the battery pack in the vehicle width direction. and a bent portion that displaces both ends of at least one of the first cross member and the second cross member toward the battery pack.

According to at least one embodiment of the present invention, the deformation of the cross member extending in the vehicle width direction adjacent to the battery pack absorbs the collision energy from the side of the vehicle during a side collision, thereby preventing damage to the battery pack. can be prevented.

1 is a top plan view of an electric vehicle according to an embodiment of the present invention, showing a floor panel of the vehicle from above; FIG. It is an enlarged view of the A section of FIG. Figure 3 is a perspective view of the portion of Figure 2; FIG. 4 is an enlarged view of a portion B of FIG. 3; FIG. 3 is a diagram corresponding to FIG. 2 showing the deformation state of the cross member at the time of a side collision;

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. However, the relative arrangement of components described as the embodiment or shown in the drawings is not intended to limit the scope of the present invention, but is merely an example of explanation. Note that the up, down, front, rear, left, and right directions in the description are defined as the directions in which the occupant looks forward from the driver's seat. In the drawings, "FR" indicates forward, "RR" rearward, "RH" rightward, and "UPR" upward.

Fig. 1 shows one embodiment of the present invention. FIG. 1 is a top plan view of a floor panel 5 that constitutes the floor of a front seat (seat) 3 portion of an electric vehicle (hereinafter referred to as vehicle) 1, viewed from the inside of the room. indicates

As shown in FIG. 1, the vehicle 1 includes a driving motor (not shown) that drives the wheels, and a battery pack 7 that supplies electric power to the driving motor. The battery pack 7 is integrated with a plurality of batteries housed in a container, and an inverter, etc., of electrical equipment necessary for supplying electric power to the driving motor.

The battery pack 7 has a substantially rectangular shape in a top plan view as shown in FIG. 1, and is arranged on the floor panel 5 in the central portion of the vehicle 1 with the longitudinal direction being the vehicle width direction.

It should be noted that the driving mode of the vehicle 1 may be a two-wheel drive vehicle or a four-wheel drive vehicle, and is not limited. Furthermore, the vehicle type is not limited to a passenger car type or a truck type.

As shown in FIG. 1 , the vehicle 1 has a pair of left and right side sills 9 extending in the vehicle front-rear direction and protruding upward from the floor panel 5 at both ends in the vehicle width direction of the floor panel 5 . .

In addition, the vehicle 1 extends in the vehicle width direction on the upper surface side of the floor panel 5 and connects both ends thereof to the left and right side sills 9 . A 1-seat cross member (first cross member) 11 extends in the vehicle width direction on the upper surface side of the floor panel 5 and has both ends connected to the left and right side sills 9 . and a second seat cross member (second cross member) 13 disposed along. That is, the battery pack 7 is mounted between the first seat cross member 11 and the second seat cross member 13 inside the vehicle compartment.

A floor carpet (not shown), which is an interior member, is attached to the upper surfaces of the floor panel 5, the first seat cross member 11, and the second seat cross member.

As shown in FIGS. 3 and 4, the first seat cross member 11 and the second seat cross member 13 have a hat-shaped cross-sectional shape that projects toward the interior, and the flange on the open end side of the hat shape is the floor panel. It is joined to the upper surface of 5 by spot welding.

Seat rail mounting portions 17 are provided on the upper surfaces of the first seat cross member 11 and the second seat cross member 13 to support left and right seat rails 15 that support the front seat 3 so as to be slidable in the longitudinal direction of the vehicle. and attached by bolts or weld bolts. The front side of the seat rail 15 is attached to the first seat cross member 11 and the rear side is attached to the second seat cross member 13 .

Further, on the lower surface of the floor panel 5, a pair of left and right battery cells which extend in the vehicle front-rear direction inside the side sill 9 in the vehicle width direction and outside the battery pack 7 in the vehicle width direction and constitute a part of the frame member. A side member 19 is formed. The pair of left and right side members 19 has a hat-shaped cross-sectional shape projecting toward the outside of the vehicle, and the hat-shaped open end flange is joined to the lower surface of the floor panel 5 by spot welding.

As shown in FIG. 2, the battery pack 7 is attached to battery pack attachment portions 21 provided on the first seat cross member 11 and the second seat cross member 13 with bolts or weld bolts. Further, as shown in FIG. 3, the battery pack 7 is arranged inside a battery pack housing recess 23 formed in a recessed shape in the central portion of the floor panel 5 below the front seat 3 in the vehicle width direction. ing.

As shown in FIG. 2 , the first seat cross member 11 includes a cross member base portion 11 a extending in the vehicle width direction at the center portion in the vehicle width direction, and cross member end portions 11 b at portions connected to the left and right side sills 9 . , and a cross member flexure 11c between the cross member base 11a and the cross member end 11b.

The cross member end portion 11b is displaced from the cross member base portion 11a to the battery pack 7 side (rear side) in the longitudinal direction of the vehicle. A position P of the cross member bent portion 11c is located at a portion of the first seat cross member 11 extending outward from the battery pack 7 in the vehicle width direction.

In this manner, the first seat cross member 11 is located outside the battery pack 7 in the vehicle width direction, and the cross member bent portion 11c causes the cross member end portion 11b to be positioned closer to the battery pack in the vehicle front-rear direction than the cross member base portion 11a. (rear side). The second seat cross member 13 extends linearly in the vehicle width direction and is connected to the left and right side sills 9 .

As shown in FIG. 2, the position P of the cross member bent portion 11c is the central position of the length of the inclined portion 11ca that constitutes the cross member bent portion 11c in plan view from above the vehicle.

Further, although the cross member bent portion 11c is formed in the first seat cross member 11 in the above example, it is formed in the second seat cross member 13 so that the position of the cross member end portion 13b of the second seat cross member 13 is increased. may be displaced to the battery pack side (front side), or may be provided on both the first seat cross member 11 and the second seat cross member 13 . The same applies to the embodiments described below.

　Also, the diagrams shown in FIGS. 1 to 5 mainly show the right side of the vehicle, but the left side has a similar structure.

According to the embodiment described above, in the event of a side collision of the vehicle, the side sill 9 on the collision side intrudes inward in the vehicle width direction when viewed from the vehicle front-rear direction. As a result, a collision load directed inward in the vehicle width direction acts on the cross member end portion 11b on the collision side of the first seat cross member 11, causing the cross member bent portion 11c to bend and the cross member end portion 11b to move toward the battery pack 7 side. Get closer. The bending of the cross member bent portion 11c absorbs the collision energy.

Further, the cross member end portion 11b side protects the vehicle width direction side of the battery pack 7 due to the bending of the cross member bent portion 11c toward the battery pack 7 side. That is, the bending of the cross member bending portion 11c causes the cross member end portion 11b to deform so as to cover the surface of the battery pack 7 on the vehicle width direction side. It is possible to prevent damage due to strong contact with the surface of the pack 7 on the vehicle width direction side.

Furthermore, since the position P of the cross member bent portion 11c is arranged at a portion extending outward in the vehicle width direction from the battery pack 7, the bent portion of the cross member bent portion 11c at the time of a side collision does not reach the outside of the battery pack 7 in the vehicle width direction. occurs in For this reason, if the first seat cross member 11 were linear, the folding position would not be specified. However, this embodiment can prevent such damage.

Further, since the cross member bent portion 11c is formed in the first seat cross member 11 disposed on the front side of the battery pack 7, the cross member end portion 11b is displaced toward the battery pack 7, thereby The leg space for the occupant seated in 3 is expanded, and the comfort is secured.

In some embodiments, as shown in FIG. 2, the position P of the cross member bent portion 11c extends in the vehicle longitudinal direction to the vehicle width direction inner side of the side sill 9 and the vehicle width direction outer side of the battery pack 7. It is provided outside the pair of left and right side members 19 in the vehicle width direction. As shown in FIG. 2, the position P of the cross member bent portion 11c is provided immediately outside the flange 19a of the side member 19. As shown in FIG.

According to such a configuration, the cross member bent portion 11c is positioned outside the battery pack 7 in the vehicle width direction and further outside the side member 19, which is a frame member of the vehicle body, in the vehicle width direction. In the event of a side collision, when a collision load acting inward in the vehicle width direction is applied to the cross member end portion 11b on the collision side of the first seat cross member 11, the bending of the cross member bent portion 11c is received by the side member 19. It is possible to reliably prevent the influence of bending of the member bent portion 11c from reaching the battery pack 7 side.

In some embodiments, as shown in FIGS. 2 and 3, the first seat cross member 11 on which the cross member bent portion 11c is formed has a width from the center side in the vehicle width direction to the position P of the cross member bent portion 11c. , a reinforcing member 25 is provided.

The reinforcing member 25 has, for example, a hat-shaped cross-sectional shape made of metal so as to overlap the inner side of the hat-shaped cross-sectional shape of the first seat cross member 11 . The cross-sectional side wall surfaces are joined by spot welding.

According to this configuration, the reinforcing member 25 is provided inside the hat-shaped cross-sectional shape from the center side of the first seat cross member 11 in the vehicle width direction to the cross member bent portion 11c. When a collision load directed inward in the vehicle width direction acts on the cross member end portion 11b on the collision side of the seat cross member 11, the bending of the cross member bending portion 11c is prevented from expanding toward the center side of the first seat cross member 11. be done.

Therefore, by controlling the length of the reinforcing member 25 according to the position of the reinforcing member 25 on the cross member bending portion 11c side and the position on the central side, and by controlling the plate thickness of the reinforcing member 25, the cross member bending The bending mode of the portion 11c can be controlled, and it is possible to prevent the first seat cross member 11 and the side sill 9 from entering the battery pack 7 side due to the bending and making strong contact and causing damage.

In some embodiments, as shown in FIGS. 2 to 4, on the side wall surface of the first seat cross member 11 on the battery pack 7 side, at a position corresponding to the position P of the cross member bent portion 11c, that is, A concave folded bead 27 is formed at a position corresponding to the tip of the reinforcing member 25 on the cross member bent portion 11c side.

The folding bead 27 is formed so as to serve as a starting point for bending the cross member bending portion 11c toward the battery pack 7 side by a collision load acting from the cross member end portion 11b in a side collision. Further, as shown in FIG. 2, the bent bead 27 is positioned immediately outside the side member 19 (flange 19a of the side member 19) in plan view from above.

According to such a configuration, the bending bead 27 serves as a starting point for bending the cross member bending portion 11c toward the battery pack 7 in the event of a side collision. can be controlled to

In some embodiments, as shown in FIG. 2, the cross member bent portion 11c is formed with an inclined portion 11ca that displaces the cross member end portion 11b of the first seat cross member 11 toward the battery pack 7 in a top plan view. , an inner bent portion 11cb formed on the inner side in the vehicle width direction of the inclined portion 11ca, and an outer bent portion 11cc formed on the outer side in the vehicle width direction, the inner bent portion 11cb extending in the vehicle width direction. It is connected to the member base portion 11a, and the outer bent portion 11cc is connected to the cross member end portion 11b extending in the vehicle width direction.

According to such a configuration, the cross member bent portion 11c has the inner bent portion 11cb and the outer bent portion 11cc, and bending deformation occurs at two points, so collision energy is reliably absorbed.

Furthermore, the inner bent portion 11cb and the outer bent portion 11cc are formed in a curvilinear curved shape, and have a shape that is gently bent from the cross member base portion 11a to the cross member end portion 11b.

Since the cross member bent portion 11c has a curved shape that can be gently bent, when the collision load at the time of a side collision acts inward in the vehicle width direction from the cross member end portion 11b of the first seat cross member 11, the inner bent portion 11cb and Abrupt bending at the outer bent portion 11cc is prevented, and collision energy is reliably absorbed by the cross member bent portion 11c.

FIG. 5 shows the deformed state of the first seat cross member 11 during a side collision. This FIG. 5 is a diagram corresponding to the state before the side collision of FIG. As shown in FIG. 5, the cross member bent portion 11c, the reinforcing member 25, and the folded bead 27 are provided. It shows how the deformation of the first seat cross member 11 is controlled outside the member 19. FIG.

When the collision object collides with the pole 29 from the side, the side sill 9 on the collision side intrudes inward in the vehicle width direction when viewed from the vehicle front-rear direction. As a result, a collision load directed inward in the vehicle width direction acts on the cross member end portion 11b of the first seat cross member 11 on the collision side. At this time, the cross member bent portion 11c bends toward the battery pack 7 with the bead 27 as a starting point, and the cross member end portion 11b approaches the battery pack 7 side. The bending of the cross member bent portion 11c absorbs the collision energy.

Furthermore, the cross member bent portion 11c is located outside the battery pack 7 in the vehicle width direction and outside the side member 19 in the vehicle width direction. Further, a reinforcing member 25 is provided from the center side in the vehicle width direction to the cross member bent portion 11c. A bent bead 27 is formed on the side wall surface of the first seat cross member 11 corresponding to the cross member bent portion 11c.

With these configurations, the first seat cross member 11 is controlled so that the bending deformation of the cross member bent portion 11c is performed outside the battery pack 7 in the vehicle width direction and outside the side member 19 in the vehicle width direction. This is shown in FIG.

1 vehicle (electric vehicle)
3 front seats (seats)
5 floor panel 7 battery pack 9 side sill 11 first seat cross member (first cross member)
11a Cross member base (base)
11b Cross member base (end)
11c Cross member bending portion (bending portion)
11ca inclined portion 11cb inner bent portion 11cc outer bent portion 13 second seat cross member (second cross member)
15 Seat rail 17 Seat rail mounting portion 19 Side member 19a Side member flange 21 Battery pack mounting portion 23 Battery pack housing recess 25 Reinforcement member 27 Folding bead P Position of cross member bending portion

Claims

An electric vehicle provided with a battery pack for supplying electric power to a driving motor below a seat of the vehicle and inside the vehicle interior from a floor panel,
left and right side sills extending in the longitudinal direction of the vehicle at the ends of the floor panel in the vehicle width direction;
a first cross member extending in the vehicle width direction on the upper surface side of the floor panel and having both ends connected to the left and right side sills, respectively, and disposed on the front side of the battery pack;
a second cross member extending in the vehicle width direction on the upper surface side of the floor panel and having both ends connected to the left and right side sills, respectively, and disposed on the rear side of the battery pack;
Both end portions of at least one of the first cross member and the second cross member are attached to portions of the battery pack that extend outward in the vehicle width direction from the battery pack in at least one of the first cross member and the second cross member. An electric vehicle characterized by having a bent portion that displaces to the side.
The electric vehicle according to claim 1, wherein the bent portion is formed in the first cross member.
a pair of left and right side members provided on the lower surface side of the floor panel and extending in the vehicle front-rear direction inside the side sill in the vehicle width direction and outside the battery pack in the vehicle width direction,
The electric vehicle according to claim 1 or 2, wherein the bent portion is provided outside the side member in the vehicle width direction.
At least one of the first cross member and the second cross member on which the bent portion is formed is provided with a reinforcing member extending from the center side in the vehicle width direction to the bent portion. 2. The electric vehicle according to 2.
A side wall surface of at least one of the first cross member and the second cross member on which the bent portion is formed, on the side of the battery pack, is located at the position of the bent portion so that the bent portion can be bent to the battery pack in the event of a side collision. 5. The electric vehicle according to claim 4, wherein a folding bead is formed as a starting point for bending to the side.
The bent portion includes, in a top plan view, an inclined portion that displaces at least one end of the first cross member or the second cross member on which the bent portion is formed toward the battery pack, and The first cross has an inner bent portion formed on the inner side in the vehicle width direction and an outer bent portion formed on the outer side of the inclined portion in the vehicle width direction, the inner bent portion extending in the vehicle width direction. It is connected to a base portion of at least one of the member or the second cross member, and the outer bent portion is connected to an end portion of at least one of the first cross member or the second cross member extending in the vehicle width direction. The electric vehicle according to claim 1.
The inner bent portion and the outer bent portion that constitute the bent portion are formed in curved shapes, and are gently bent from the base portion to the end portion of at least one of the first cross member or the second cross member. The electric vehicle according to claim 6, characterized in that it has a shape.