WO2023085162A1 - Soubassement de carrosserie de véhicule - Google Patents

Soubassement de carrosserie de véhicule Download PDF

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Publication number
WO2023085162A1
WO2023085162A1 PCT/JP2022/040771 JP2022040771W WO2023085162A1 WO 2023085162 A1 WO2023085162 A1 WO 2023085162A1 JP 2022040771 W JP2022040771 W JP 2022040771W WO 2023085162 A1 WO2023085162 A1 WO 2023085162A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
width direction
vehicle width
panel
vehicle body
Prior art date
Application number
PCT/JP2022/040771
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English (en)
Japanese (ja)
Inventor
正敏 吉田
明男 杉本
Original Assignee
株式会社神戸製鋼所
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Filing date
Publication date
Application filed by 株式会社神戸製鋼所 filed Critical 株式会社神戸製鋼所
Publication of WO2023085162A1 publication Critical patent/WO2023085162A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units

Definitions

  • the present disclosure relates to a vehicle body lower structure.
  • Electric vehicles such as electric vehicles need to be equipped with large-capacity batteries in order to ensure a sufficient cruising range, but they also require a spacious cabin.
  • many electric vehicles have a large-capacity battery housed in a large battery case and mounted on the entire underfloor of the passenger compartment.
  • Patent Document 1 discloses a vehicle body lower structure in which a large battery case is arranged on the entire underfloor of the vehicle compartment, and a pair of side sills are arranged on both sides of the battery case in the vehicle width direction. Reinforcing members are arranged in the pair of side sills, and the reinforcing members receive a load in the vehicle width direction (side impact load) applied at the time of a vehicle side collision. A pair of side sills are joined to the floor cross member and the battery case, and the side impact load is also received by the floor cross member and the battery case.
  • Patent Document 1 a large battery case is placed on the entire underfloor of the passenger compartment, and the battery case receives a side impact load. Moreover, the structure for protecting the battery by providing a cross member extending in the vehicle width direction inside the battery case is complicated. Also, a gap is inevitably created between the pair of side sills outside the battery case and the cross member inside the battery case. Therefore, the generation timing of the reaction force against the side impact load is delayed, and high energy absorption efficiency cannot be ensured. Therefore, there is room for improvement in terms of load bearing performance as well.
  • An object of the present disclosure is to secure high battery protection performance and load bearing performance against side impact load with a simple structure in a vehicle body lower structure that stores a battery under the floor of the vehicle compartment like an electric vehicle.
  • the present disclosure includes a floor panel that forms a floor surface of a vehicle compartment, a pair of side sills that extend in the vehicle front-rear direction, a plurality of cross members that extend in the vehicle width direction below the floor panel and connect the pair of side sills, a side sill reinforcing member that reinforces each of the pair of side sills from the inside and overlaps with the plurality of cross members in the vehicle vertical direction; and a battery pack disposed thereon.
  • the side impact load can be received by the plurality of cross members. Furthermore, since the plurality of cross members overlap the side sill reinforcing member in the vertical direction of the vehicle, the side impact load received by the side sill reinforcing member can be transmitted to the plurality of cross members. Therefore, it is possible to ensure high load bearing performance against the side impact load. Moreover, since the space between the pair of side sills in the vehicle width direction is maintained by the plurality of cross members, damage to the battery pack arranged between the pair of side sills in the event of a vehicle side collision can be suppressed.
  • the battery pack includes battery cells and preferably has waterproof performance. In this way, a large-sized battery case that would be placed on the entire underfloor of the passenger compartment is not required, and high battery protection performance against side impact loads and load bearing performance can be ensured with a simple structure.
  • the battery pack may be arranged between the plurality of cross members in the vehicle front-rear direction and joined to the plurality of cross members.
  • the battery pack is arranged between the plurality of cross members.
  • a plurality of cross members are provided outside the battery pack. Therefore, the structure can be simplified as compared with the case where a plurality of cross members are provided inside the battery case. Also, since the battery pack is joined to the plurality of cross members, the battery pack can be easily installed.
  • the vehicle body lower structure may further include an undercover that covers the lower surface of the battery pack.
  • the undercover can exert a shock-absorbing function on the bottom surface of the vehicle and protect the battery pack from flying stones and the like from the road surface.
  • the undercover also functions as a rectifying plate, air resistance can be reduced.
  • the side sill reinforcing member may have a closed cross-sectional shape that defines a plurality of buffer spaces aligned in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
  • the plurality of buffer spaces are collapsed in order from the outside in the vehicle width direction, thereby exhibiting high energy absorption efficiency.
  • the side sill reinforcing member may be an extruded profile, and each of the pair of side sills includes an inner panel made of steel plate arranged on the inner side in the vehicle width direction and an outer panel made of steel plate arranged on the outer side in the vehicle width direction.
  • the inner panel may include an inner upper panel arranged on the upper side in the vehicle width direction and an inner lower panel arranged on the lower side in the vehicle width direction, the inner upper panel and the inner lower panel being:
  • the plurality of cross members may be spaced apart in the vertical direction of the vehicle so as to form openings, and the plurality of cross members are extruded members extending from the openings into the pair of side sills, and the side sill reinforcing members. may be joined.
  • Each of the pair of side sills may include a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side, and the plurality of cross members are made of steel plate. and may be joined to the inner panel.
  • Each of the pair of side sills may include an inner panel arranged inside in the vehicle width direction and an outer panel arranged outside in the vehicle width direction,
  • the side sill reinforcement may be configured as an extruded profile integral with the inner panel.
  • the floor panel may have a convex shape at the central portion in the vehicle width direction.
  • the convex shape of the floor panel ensures high load-bearing performance against a frontal collision of the vehicle. Normally, if a floor panel is formed in a convex shape, there is a risk that the load-bearing performance against side impact loads will decrease. Therefore, the above configuration functions effectively with its demerits suppressed.
  • a side view of an electric vehicle. 1 is a perspective view of a vehicle body lower structure according to a first embodiment; FIG. The top view of the vehicle body lower part structure which concerns on 1st Embodiment.
  • FIG. 4 is a cross-sectional view taken along line AA of FIG. 3; FIG. 4 is a cross-sectional view taken along line BB of FIG. 3;
  • electric vehicle 1 is a vehicle that runs by driving a motor (not shown) with electric power supplied from battery pack 10 .
  • the electric vehicle 1 may be an electric vehicle, a plug-in hybrid vehicle, or the like.
  • the type of vehicle is not particularly limited, and may be passenger cars, trucks, work vehicles, or other types of mobility. In the following description, the electric vehicle 1 is a passenger car type electric vehicle.
  • the electric vehicle 1 has a motor, high-voltage equipment, etc. (not shown) mounted on the front part 20 of the vehicle body.
  • the electric vehicle 1 has a compartment R in the vehicle body central portion 30 .
  • a plurality of battery packs 10 are stored in substantially the entire underfloor of the vehicle compartment R in a vehicle body lower structure 100 that constitutes the lower side of the vehicle compartment R.
  • each of the plurality of battery packs 10 has a waterproof case that seals the battery cells.
  • the front-rear direction of the electric vehicle 1 is indicated by the X direction
  • the up-down direction is indicated by the Z direction.
  • the width direction of the electric vehicle 1 is indicated by the Y direction in FIG. 2 and subsequent drawings.
  • the vehicle body lower structure 100 constitutes the lower frame of the vehicle body central portion 30 of the electric vehicle 1. As shown in FIG. In FIGS. 2-5, a portion of the underbody structure 100 is shown. Actually, the vehicle body lower structure 100 shown in FIGS. 2 to 5 has a shape symmetrical in the vehicle width direction with respect to the center line CL, and the same shape continues in the vehicle longitudinal direction beyond the breaking line BL. Note that FIG. 3 shows a state in which a floor panel 110, which will be described later, is removed.
  • the vehicle body lower structure 100 includes a floor panel 110 forming a floor surface of a vehicle interior R, a pair of side sills 120 extending in the vehicle front-rear direction, and extending in the vehicle width direction below the floor panel 110 to connect the pair of side sills 120 . and a plurality of cross members 130 .
  • floor panel 110 is made of steel plate.
  • the upper surface of the floor panel 110 is flat and constitutes the floor surface of the passenger compartment R.
  • Vehicle width direction end portions of the floor panel 110 are bent upward and welded to inner panels 121 of the pair of side sills 120, which will be described later.
  • the battery pack 10 is arranged below the floor panel 110 and between the pair of side sills 120 in the vehicle width direction.
  • a reinforcing member called a floor cross member is arranged on the floor panel.
  • a plurality of cross members 130 arranged under the floor panel 110 can ensure sufficient load bearing performance, so the floor cross members are omitted.
  • each of the pair of side sills 120 has a steel plate inner panel 121 arranged on the vehicle width direction inner side and a steel plate outer panel 122 arranged on the vehicle width direction outer side.
  • Inner panel 121 and outer panel 122 generally have a hat shape in cross section perpendicular to the vehicle front-rear direction.
  • the inner panel 121 and the outer panel 122 are welded together at both ends in the vertical direction of the vehicle to define a side sill space S1 inside.
  • a side sill reinforcing member 123 made of an aluminum alloy extruded shape is arranged in the side sill space S1.
  • the side sill reinforcing member 123 reinforces each of the pair of side sills 120 from the inside.
  • the side sill reinforcing member 123 contacts the inner panel 121 on the inner side in the vehicle width direction, and contacts the outer panel 122 on the outer side in the vehicle width direction.
  • the side sill reinforcing member 123 is joined to at least one of the inner panel 121 and the outer panel 122 by dissimilar material joining such as SPR (Self Piercing Rivet).
  • the side sill reinforcement 123 may be adjacent to the inner panel 121 or outer panel 122 without abutting them.
  • the side sill reinforcing member 123 may be joined to at least one of the inner panel 121 and the outer panel 122 via a bracket (not shown).
  • the side sill reinforcing member 123 has a closed cross-sectional shape defining a plurality of buffer spaces S11 to S13 arranged in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
  • Each of the plurality of buffer spaces S11-S13 may have any shape.
  • the side sill reinforcing member 123 is arranged so as to overlap with the plurality of cross members 130 in the vertical direction of the vehicle.
  • the side sill reinforcing member 123 and the plurality of cross members 130 overlap each other by 50% or more in size in the vertical direction of the vehicle.
  • the side sill reinforcing member 123 and the plurality of cross members 130 are arranged so as to substantially overlap (80% or more of each other) in the vertical direction of the vehicle.
  • the plurality of cross members 130 are made of steel plate and joined to the inner panel 121 .
  • the joining is, for example, MIG (Metal Inert Gas) welding.
  • the joining may be other joining means such as RSW (Resistance Spot Welding). This also applies to welding of subsequent members.
  • each of the plurality of cross members 130 has the same shape, and is a rectangle partitioned in the vehicle vertical direction in a cross section perpendicular to the vehicle width direction.
  • each of the plurality of cross members 130 may not have the same shape, and the cross-sectional shape may also be any shape.
  • the battery pack 10 is arranged between the plurality of cross members 130 in the longitudinal direction of the vehicle.
  • Battery pack 10 is joined to a plurality of cross members 130 .
  • the battery pack 10 has a flange portion 11 extending in the vehicle front-rear direction on its lower surface, and is joined to the lower surfaces of the plurality of cross members 130 at the flange portion 11 .
  • the joint may be a mechanical joint such as a bolt so that it can be detached during replacement.
  • the battery pack 10 is bolted from below for easy attachment and detachment.
  • a steel plate undercover 140 that covers the lower surface of the battery pack 10 is provided in the vehicle body lower structure 100 .
  • the undercover 140 is welded to the pair of side sills 120 so that a gap G is provided between the undercover 140 and the battery pack 10 in the vertical direction of the vehicle.
  • the undercover 140 is a sheet of plate material and is arranged over the entire vehicle body lower structure 100 .
  • the undercover 140 may be individually provided for each battery pack 10 .
  • the vehicle body lower structure 100 of this embodiment has the following advantages.
  • a plurality of cross members 130 joined to a pair of side sills 120 are arranged under the floor of the passenger compartment R (under the floor panel 110), so that the side impact load can be received by the plurality of cross members 130. Furthermore, since the plurality of cross members 130 overlap the side sill reinforcing member 123 in the vertical direction of the vehicle, the side impact load received by the side sill reinforcing member 123 can be transmitted to the plurality of cross members 130 . Therefore, it is possible to ensure high load bearing performance against the side impact load.
  • the battery pack 10 is arranged between a plurality of cross members 130 .
  • a plurality of cross members 130 are provided outside the battery pack 10 . Therefore, the structure can be simplified as compared with the case where a plurality of cross members 130 are provided inside the battery case. Moreover, since the battery pack 10 is joined to the plurality of cross members 130, the battery pack 10 can be easily installed.
  • the undercover 140 can exert the shock absorbing function of the bottom surface of the electric vehicle 1, and can protect the battery pack 10 against flying stones from the road surface.
  • the undercover 140 also functions as a rectifying plate, it is possible to reduce air resistance.
  • the plurality of buffer spaces S11 to S13 of the side sill reinforcing member 123 are crushed in order from the outside in the vehicle width direction, thereby exhibiting high energy absorption efficiency.
  • the pair of side sills 120 and the plurality of cross members 130 are both made of steel plate, so a specific design using a commonly used steel plate can be realized.
  • a vehicle body lower structure 100 of a second embodiment shown in FIGS. 6 and 7 differs from that of the first embodiment in the configuration of a plurality of cross members 130, a pair of side sills 120, and a side sill reinforcing member 123.
  • FIG. The configuration other than this is substantially the same as the first embodiment. Therefore, the description of the parts shown in the first embodiment may be omitted. 6 and 7 correspond to FIGS. 2 and 5 of the first embodiment, respectively.
  • the side sill reinforcing member 123 and the inner panel 121 are integrally configured as an aluminum alloy extruded shape.
  • the integrally formed side sill reinforcing member 123 and inner panel 121 have buffer spaces S11 to S13 as in the first embodiment.
  • the outer panel 122 is made of the same steel plate as in the first embodiment.
  • the inner panel 121 (side sill reinforcing member 123) and the outer panel 122 are joined by dissimilar metals using SPR or the like at both ends in the vertical direction of the vehicle.
  • the plurality of cross members 130 have the same shape as in the first embodiment, but are made of aluminum alloy extruded profiles.
  • the plurality of cross members 130 are welded to the inner panel 121 (side sill reinforcing member 123) at both end portions in the vehicle width direction.
  • the floor panel 110 and the undercover 140 may be made of the same steel plate as in the first embodiment, or may be made of an aluminum alloy plate material.
  • both the inner panel 121 (side sill reinforcing member 123) and the plurality of cross members 130 in the vehicle body lower part structure 100 are extruded members. Specific design using materials can be realized.
  • a vehicle body lower structure 100 of a third embodiment shown in FIGS. 8 and 9 differs from that of the first embodiment in the configuration of a plurality of cross members 130, a pair of side sills 120, and a side sill reinforcing member 123.
  • FIG. The configuration other than this is substantially the same as the first embodiment. Therefore, the description of the parts shown in the first embodiment may be omitted. 8 and 9 correspond to FIGS. 2 and 5 of the first embodiment, respectively.
  • the inner panel 121 includes an inner upper panel 121a made of a steel plate arranged on the vehicle width direction upper side, and an inner lower panel 121b arranged spaced downward from the inner upper panel 121a.
  • An opening 121c extending in the vehicle front-rear direction is defined by the inner upper panel 121a and the inner lower panel 121b.
  • the plurality of cross members 130 are extruded profiles made of aluminum alloy.
  • a plurality of cross members 130 extend into the pair of side sills 120 from the openings 121 c and are welded to the side sill reinforcing members 123 .
  • the floor panel 110 and the undercover 140 may be made of the same steel plate as in the first embodiment.
  • the floor panel 110 is welded to the inner upper panel 121a, and the undercover 140 is bolted to the inner lower panel 121b.
  • the floor panel 110 and the undercover 140 may be plate materials made of aluminum alloy.
  • the floor panel 110 is joined to the inner upper panel 121a by dissimilar metals, and the undercover 140 is joined to the inner lower panel 121b by dissimilar metals.
  • both the side sill reinforcing member 123 and the plurality of cross members 130 are extruded profiles, so a specific design using general-purpose extruded profiles can be realized. .
  • the floor panel 110 has a convex shape (convex portion 111) at the central portion in the vehicle width direction.
  • FIG. 10 shows only half of the convex portion 111 in the vehicle width direction, the convex portion 111 actually has a convex shape symmetrical in the vehicle width direction.
  • the convex shape of the floor panel 110 can ensure high load-bearing performance against a frontal collision of the vehicle. Normally, if the floor panel is formed in a convex shape, the load-bearing performance against the side impact load may decrease, but as described above, the multiple cross members 130 ensure high load-bearing performance against the side impact load. Therefore, the configuration of this modified example functions effectively with its demerit suppressed.
  • (Aspect 1) a floor panel forming the floor surface of the passenger compartment; a pair of side sills extending in the longitudinal direction of the vehicle; a plurality of cross members extending in the vehicle width direction below the floor panel and connecting the pair of side sills; a side sill reinforcing member that reinforces each of the pair of side sills from the inside and is arranged to overlap the plurality of cross members in the vertical direction of the vehicle; a battery pack disposed between the pair of side sills in the vehicle width direction below the floor panel.
  • (Aspect 2) The vehicle body lower structure according to aspect 1, wherein the battery pack is arranged between the plurality of cross members in the vehicle front-rear direction and is joined to the plurality of cross members.
  • the side sill reinforcement is an extruded profile
  • Each of the pair of side sills includes a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side
  • the inner panel includes an inner upper panel arranged on the upper side in the vehicle width direction and an inner lower panel arranged on the lower side in the vehicle width direction
  • the inner upper panel and the inner lower panel are spaced apart in the vertical direction of the vehicle so as to form an opening
  • the lower portion of the vehicle body according to any one of aspects 1 to 4, wherein the plurality of cross members are extruded members extending from the opening into the pair of side sills, and are joined to the side sill reinforcing members. structure.
  • Each of the pair of side sills includes a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side, The vehicle body lower part structure according to any one of modes 1 to 4, wherein the plurality of cross members are made of steel and are joined to the inner panel.
  • each of the pair of side sills includes an inner panel arranged on the inner side in the vehicle width direction and an outer panel arranged on the outer side in the vehicle width direction, The vehicle body lower part structure according to any one of modes 1 to 4, wherein the side sill reinforcing member is configured as an extruded profile integrally with the inner panel.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

L'invention concerne un soubassement de carrosserie de véhicule 100 comprenant : un panneau de plancher 110 qui constitue une surface de plancher d'une cabine de véhicule R ; une paire de longerons latéraux 120 qui s'étendent dans la direction avant-arrière du véhicule ; une pluralité d'éléments transversaux 130 qui s'étendent dans la direction de la largeur du véhicule au-dessous du panneau de plancher 110 de façon à relier la paire de longerons latéraux 120 ; un élément de renforcement de longeron latéral 123 qui renforce les longerons latéraux 120 à partir du côté interne et est disposé de façon à chevaucher les éléments transversaux 130 dans la direction verticale du véhicule ; et un bloc-batterie qui est disposé au-dessous du panneau de plancher 110 et entre les longerons latéraux 120 dans la direction de la largeur du véhicule.
PCT/JP2022/040771 2021-11-15 2022-10-31 Soubassement de carrosserie de véhicule WO2023085162A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-185718 2021-11-15
JP2021185718A JP2023072957A (ja) 2021-11-15 2021-11-15 車体下部構造

Publications (1)

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WO2023085162A1 true WO2023085162A1 (fr) 2023-05-19

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0867151A (ja) * 1994-08-30 1996-03-12 Nissan Motor Co Ltd 電気自動車のバッテリ取付構造
JP2017196952A (ja) * 2016-04-26 2017-11-02 トヨタ自動車株式会社 車両のバッテリ搭載構造
JP2018090021A (ja) * 2016-11-30 2018-06-14 トヨタ自動車株式会社 車体下部構造
US20180337374A1 (en) * 2017-05-16 2018-11-22 Shape Corp. Vehicle battery tray with integrated battery retention and support feature
JP2018187986A (ja) * 2017-04-28 2018-11-29 トヨタ自動車株式会社 車両下部構造
JP2018202946A (ja) * 2017-05-31 2018-12-27 トヨタ自動車株式会社 電池搭載構造
JP2020055473A (ja) * 2018-10-03 2020-04-09 本田技研工業株式会社 車体下部構造
US20210178883A1 (en) * 2019-12-16 2021-06-17 Hyundai Motor Company Vehicle floor structure

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0867151A (ja) * 1994-08-30 1996-03-12 Nissan Motor Co Ltd 電気自動車のバッテリ取付構造
JP2017196952A (ja) * 2016-04-26 2017-11-02 トヨタ自動車株式会社 車両のバッテリ搭載構造
JP2018090021A (ja) * 2016-11-30 2018-06-14 トヨタ自動車株式会社 車体下部構造
JP2018187986A (ja) * 2017-04-28 2018-11-29 トヨタ自動車株式会社 車両下部構造
US20180337374A1 (en) * 2017-05-16 2018-11-22 Shape Corp. Vehicle battery tray with integrated battery retention and support feature
JP2018202946A (ja) * 2017-05-31 2018-12-27 トヨタ自動車株式会社 電池搭載構造
JP2020055473A (ja) * 2018-10-03 2020-04-09 本田技研工業株式会社 車体下部構造
US20210178883A1 (en) * 2019-12-16 2021-06-17 Hyundai Motor Company Vehicle floor structure

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