JP2014012524A - Battery mounting structure of electric vehicle - Google Patents

Battery mounting structure of electric vehicle Download PDF

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JP2014012524A
JP2014012524A JP2013182185A JP2013182185A JP2014012524A JP 2014012524 A JP2014012524 A JP 2014012524A JP 2013182185 A JP2013182185 A JP 2013182185A JP 2013182185 A JP2013182185 A JP 2013182185A JP 2014012524 A JP2014012524 A JP 2014012524A
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battery
cross member
mounting structure
vehicle body
electric vehicle
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JP2013182185A
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JP5679133B2 (en
Inventor
Hiroaki Kano
宏明 加納
Takao Yoshikawa
隆夫 吉川
Takashi Nogami
貴司 野上
Katsuhiro Suzuki
克宏 鈴木
Tomoya Nishita
智哉 西多
Ken Rokusha
健 六車
Seiichi Takasaki
静一 高崎
Hideki Honjo
英喜 本城
Isao Asai
功 浅井
Kito Yamamoto
貴統 山本
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Mitsubishi Motors Corp
Mitsubishi Automotive Engineering Co Ltd
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Mitsubishi Motors Corp
Mitsubishi Automotive Engineering Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a battery mounting structure of an electric vehicle, which reduces damage to a battery pack even if a vehicle side collision occurs.SOLUTION: A battery tray 7 is fixed onto a front battery cross member lower 5 and a rear battery cross member lower, and a battery pack 2 is mounted on the battery tray 7'. In addition, a fitting part, and a deformation part, the height of which is lower and the cross-section area of which is smaller than the fitting part, are formed in a battery cross member upper 4'. The fitting part and the deformation part are connected through a slope at the center of the battery cross member upper 4'. The battery cross member upper 4' is welded and fixed to the fitting part 5a and an upper surface of the fitting part and the connection part of the battery tray 7'. Then, the fitting part of the battery cross member upper 4' is fixed to a pair of side members 3.

Description

本発明は、電気自動車のバッテリ搭載構造に係り、詳しくは、車両側突時のバッテリの損傷を防ぐ構造に関する。   The present invention relates to a battery mounting structure for an electric vehicle, and more particularly to a structure for preventing damage to a battery at the time of a vehicle side collision.

従来、電気自動車のバッテリ搭載構造として、車両衝突時にバッテリパックの損傷を防止するために、バッテリセルを内蔵するバッテリケースと閉断面のバッテリクロスメンバとをボルトで固定し、更にバッテリクロスメンバとサイドメンバとをボルトで固定するようにしてバッテリパックを車両の側方で車両の前後方向に延在する一対のサイドメンバの間に配設するようにしている（特許文献１）。   Conventionally, as a battery mounting structure of an electric vehicle, in order to prevent damage to the battery pack in the event of a vehicle collision, a battery case containing a battery cell and a battery cross member having a closed cross section are fixed with bolts, and the battery cross member and side The battery pack is disposed between a pair of side members extending in the front-rear direction of the vehicle on the side of the vehicle so that the members are fixed with bolts (Patent Document 1).

特開２００８−１６２４９７号公報JP 2008-162497 A

しかしながら、上記特許文献１の電気自動車のバッテリ搭載構造では、バッテリケースと閉断面のバッテリクロスメンバとをボルトで固定しており、例えば、車両の側方へ他車両等が高速で衝突すると衝突時の荷重を吸収することができず、バッテリクロスメンバが車両の中央方向に移動し、バッテリクロスメンバによってバッテリパック、ひいてはバッテリケース内のバッテリセルを損傷し、電気安全性を低下させることとなり好ましいことではない。   However, in the battery mounting structure of the electric vehicle described in Patent Document 1, the battery case and the battery cross member having a closed cross section are fixed with bolts. For example, when another vehicle collides with the side of the vehicle at high speed, This is preferable because the battery cross member moves toward the center of the vehicle and the battery cross member damages the battery pack, and consequently the battery cells in the battery case, thereby lowering the electrical safety. is not.

本発明は、この様な問題を解決するためになされたもので、その目的とするところは、車両側突時でもバッテリパックの損傷を軽減することのできる電気自動車のバッテリ搭載構造を提供することにある。   The present invention has been made to solve such a problem, and an object of the present invention is to provide a battery mounting structure for an electric vehicle that can reduce damage to the battery pack even in the event of a vehicle-side collision. It is in.

上記の目的を達成するために、請求項１の電気自動車のバッテリ搭載構造では、車体の両側部に前後方向に延在する一対のサイドメンバの間にバッテリパックが配設され、前記バッテリパックは、車体横方向に延在する複数のバッテリクロスメンバを介して前記サイドメンバに固定される電気自動車のバッテリ搭載構造において、前記バッテリクロスメンバは、下方向に開口する断面コの字状のバッテリクロスメンバアッパと前記バッテリクロスメンバアッパの下面に固定された平板状のバッテリクロスメンバロアとからなり、前記バッテリクロスメンバアッパは、前記サイドメンバに取り付けられる取付部と、前記取付部より高さが低く断面積の小さい変形部と、前記取付部と前記変形部とを接続するスロープとで形成されることを特徴とする。   In order to achieve the above object, in the battery mounting structure for an electric vehicle according to claim 1, a battery pack is disposed between a pair of side members extending in the front-rear direction on both sides of the vehicle body. In the battery mounting structure of an electric vehicle fixed to the side member via a plurality of battery cross members extending in the lateral direction of the vehicle body, the battery cross member has a U-shaped battery cross that opens downward. The battery upper member includes a member upper and a flat battery cross member lower fixed to the lower surface of the battery cross member upper. The battery cross member upper has a mounting portion attached to the side member and a height lower than the mounting portion. It is formed by a deforming portion having a small cross-sectional area, and a slope connecting the mounting portion and the deforming portion. That.

また、請求項２の電気自動車のバッテリ搭載構造では、請求項１において、前記バッテリパックは、前記バッテリクロスメンバロアに載置されることを特徴とする。   The battery mounting structure for an electric vehicle according to claim 2 is characterized in that, in claim 1, the battery pack is placed on the battery cross member lower.

また、請求項３の電気自動車のバッテリ搭載構造では、請求項２において、前記バッテリパックを載置すると共に前記バッテリクロスメンバロアに載置されるバッテリトレーを有し、前記バッテリクロスメンバアッパは、前記バッテリトレーに接続されることを特徴とする。   According to a third aspect of the present invention, there is provided a battery mounting structure for an electric vehicle, wherein the battery pack is mounted on the battery cross member lower and the battery cross member upper is mounted on the battery cross member lower. The battery tray is connected to the battery tray.

請求項１の発明によれば、バッテリクロスメンバアッパをサイドメンバに取り付けられる取付部と、取付部より高さが低く断面積の小さい変形部と、取付部と変形部とを接続するスロープとで形成しており、車体の側方からの衝突時にバッテリクロスメンバに荷重が入力されると断面積を小さくして強度を低下させた変形部が折れ曲がるように変形させることができるので、バッテリクロスメンバの移動によるバッテリパックとバッテリクロスメンバアッパとの接触を少なくすることができ、バッテリクロスメンバでバッテリパックが損傷することを軽減することができる。   According to the invention of claim 1, the battery cross member upper can be attached to the side member, the deformed portion having a height lower than the mount portion and having a small cross-sectional area, and the slope connecting the mount portion and the deformed portion. When a load is input to the battery cross member at the time of a collision from the side of the vehicle body, the battery cross member can be deformed so that the deformed portion having a reduced cross-sectional area and reduced strength can be bent. The contact between the battery pack and the battery cross member upper due to movement of the battery can be reduced, and damage to the battery pack by the battery cross member can be reduced.

また、請求項２の発明によれば、バッテリパックをバッテリクロスメンバロアに載置することで、車体の側方からの衝突時の入力をバッテリパック底面へと分散してバッテリパックへの入力を低減することができる上、バッテリクロスメンバロア端部がバッテリパックに取り付けられる構成と比較して変形部の折れ曲がり変形をより促すことができる。   According to the invention of claim 2, by placing the battery pack on the battery cross member lower, the input at the time of a collision from the side of the vehicle body is distributed to the bottom surface of the battery pack so that the input to the battery pack can be performed. In addition to the configuration in which the end portion of the battery cross member lower is attached to the battery pack, bending deformation of the deformable portion can be further promoted.

また、請求項３の発明によれば、バッテリパックがバッテリトレーに載置されると共にバッテリクロスメンバアッパがバッテリトレーに固定されるので、衝突時の入力をバッテリトレーへと分散して、バッテリパックへの入力を低減することができる。   According to the invention of claim 3, since the battery pack is placed on the battery tray and the battery cross member upper is fixed to the battery tray, the input at the time of collision is distributed to the battery tray, and the battery pack The input to can be reduced.

本発明の参考例に係る電気自動車のバッテリ搭載構造が適用された車両の車体中央の下面視図である。It is a bottom view at the center of a vehicle body of a vehicle to which a battery mounting structure for an electric vehicle according to a reference example of the invention is applied. 図１の矢視Ａ−Ａ線での断面図である。It is sectional drawing in the arrow AA line of FIG. 図２のＢ部の拡大図である。It is an enlarged view of the B section of FIG. 図３のＣ−Ｃ線での断面図である。It is sectional drawing in the CC line of FIG. 車両側突時の図２のＢ部の拡大図である。It is an enlarged view of the B section of FIG. 2 at the time of a vehicle side collision. 本発明の第１実施例に係る電気自動車のバッテリ搭載構造が適用された車両の車体中央の下面視図である。1 is a bottom view of the center of a vehicle body to which a battery mounting structure for an electric vehicle according to a first embodiment of the present invention is applied. 図６の矢視Ａ’−Ａ’線での断面図である。It is sectional drawing in the arrow A'-A 'line | wire of FIG. 図７のＢ’部の拡大図である。FIG. 8 is an enlarged view of a B ′ portion in FIG. 7. 車両側突時の図７のＢ’部の拡大図である。FIG. 8 is an enlarged view of a B ′ portion in FIG. 7 at the time of a vehicle side collision.

以下、本発明の実施の形態を図面に基づき説明する。
本実施形態の車両は、当該車両の走行装置として、バッテリパックより電力が供給されインバータにより制御される走行用モータを備える電気自動車である。
まずは、本発明の参考例における電気自動車のバッテリ搭載構造を説明する。
［参考例］
図１は、本発明の参考例に係る電気自動車のバッテリ搭載構造が適用された車両の車体中央の下面視図を示している。また、図２は、図１の矢視Ａ−Ａ線での断面図を示している。そして、図３は、図２のＢ部の拡大図を示しており、図４は、図３のＣ−Ｃ線での断面図を示している。なお、図中矢印「上」は車体上方向、矢印「前」は車体前方向、矢印「横」は車体幅方向をそれぞれ示している。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The vehicle according to the present embodiment is an electric vehicle including a traveling motor that is supplied with electric power from a battery pack and controlled by an inverter as a traveling device of the vehicle.
First, a battery mounting structure for an electric vehicle according to a reference example of the present invention will be described.
[Reference example]
FIG. 1 is a bottom view of the center of a vehicle body to which a battery mounting structure for an electric vehicle according to a reference example of the present invention is applied. FIG. 2 shows a cross-sectional view taken along the line AA in FIG. 3 shows an enlarged view of a portion B in FIG. 2, and FIG. 4 shows a cross-sectional view taken along the line CC in FIG. In the figure, the arrow “up” indicates the vehicle body upward direction, the arrow “front” indicates the vehicle body front direction, and the arrow “lateral” indicates the vehicle body width direction.

図１から図４に示すように、参考例の車体１は、当該車体１の左右両側を前後方向に延伸する一対のサイドメンバ３と、バッテリクロスメンバアッパ４を介して一対のサイドメンバ３に接続されるフロントバッテリクロスメンバロア５及びリヤバッテリクロスメンバロア６とで構成されている。そして、バッテリパック２は、車体中央のフロア１１の下部に位置する一対のサイドメンバ３の間にバッテリパック２の位置決めを行うバッテリトレー７を介してフロントバッテリクロスメンバロア５及びリヤバッテリクロスメンバロア６上に配設されている。   As shown in FIGS. 1 to 4, the vehicle body 1 of the reference example has a pair of side members 3 extending in the front-rear direction on the left and right sides of the vehicle body 1 and a pair of side members 3 via a battery cross member upper 4. The front battery cross member lower 5 and the rear battery cross member lower 6 are connected. The battery pack 2 includes a front battery cross member lower 5 and a rear battery cross member lower via a battery tray 7 that positions the battery pack 2 between a pair of side members 3 positioned below the floor 11 at the center of the vehicle body. 6 is disposed.

バッテリパック２は、ケース２ａとカバー２ｂとの中に複数のバッテリセル２ｃを収めて構成されている。
一対のサイドメンバ３は、上方が開口した断面ハット型の棒状に形成されている。
バッテリクロスメンバアッパ４は、下方が開口した断面コの字型の棒状に形成されている。 The battery pack 2 is configured by housing a plurality of battery cells 2c in a case 2a and a cover 2b.
The pair of side members 3 is formed in a cross-sectional hat-shaped bar shape having an open top.
The battery cross member upper 4 is formed in a bar shape having a U-shaped cross section with an opening at the bottom.

フロントバッテリクロスメンバロア５は、金属の薄板によって略井の字状に形成されている。フロントバッテリクロスメンバロア５の車体幅方向へのそれぞれの突出部には、サイドメンバ３と接続される取付部５ａが形成されている。この取付部５ａには、ボルトが挿入される挿入穴５ｂが形成されている。更にフロントバッテリクロスメンバロア５には、バッテリパック２をボルトで固定するための複数のボルトの挿入穴５ｃが形成されている。   The front battery cross member lower 5 is formed in a substantially square shape by a thin metal plate. A mounting portion 5 a connected to the side member 3 is formed at each protruding portion of the front battery cross member lower 5 in the vehicle body width direction. The attachment portion 5a is formed with an insertion hole 5b into which a bolt is inserted. Further, the front battery cross member lower 5 is formed with a plurality of bolt insertion holes 5c for fixing the battery pack 2 with bolts.

リヤバッテリクロスメンバロア６は、金属の薄板により略井の字状に形成されており、車体後方側の一対の突出部が切り落とされた形状となっている。そして、フロントバッテリクロスメンバロア５の車体後方側の突出部とリヤバッテリクロスメンバロア６の車体前方側の突出部とが接続されており、フロントバッテリクロスメンバロア５とリヤバッテリクロスメンバロア６とが一体となってバッテリパック２の下面を支持する構成となっている。リヤバッテリクロスメンバロア６の車体幅方向へのそれぞれ突出部には、サイドメンバ３と接続される取付部６ａが形成されている。この取付部６ａには、ボルトが挿入される挿入穴６ｂが形成されている。更にリヤバッテリクロスメンバロア６には、バッテリパック２をボルトで固定するための複数のボルトの挿入穴６ｃが形成されている。   The rear battery cross member lower 6 is formed in a substantially well shape by a thin metal plate, and has a shape in which a pair of protrusions on the rear side of the vehicle body are cut off. A protrusion on the vehicle body rear side of the front battery cross member lower 5 and a protrusion on the vehicle body front side of the rear battery cross member lower 6 are connected, and the front battery cross member lower 5 and the rear battery cross member lower 6 are connected to each other. Are integrally configured to support the lower surface of the battery pack 2. A mounting portion 6 a connected to the side member 3 is formed at each protruding portion in the vehicle body width direction of the rear battery cross member lower 6. The attachment portion 6a is formed with an insertion hole 6b into which a bolt is inserted. Further, the rear battery cross member lower 6 is formed with a plurality of bolt insertion holes 6c for fixing the battery pack 2 with bolts.

バッテリトレー７は、図３に示すように断面方向視で略Ｚ字状に形成され、下面視でバッテリパック２のケース２ａの形状に沿った金属の薄板で形成されている。また、バッテリトレー７には、バッテリクロスメンバアッパ４の端部が当接する剛性が比較的低い変形部７ａが形成されている。
更に、バッテリクロスメンバアッパ４が、対応するフロントバッテリクロスメンバロア５の取付部５及びリヤバッテリクロスメンバロア６の取付部６ａの上面に溶接されるとともに、バッテリクロスメンバアッパ４の端面とバッテリトレー７の変形部７ａとが溶接されて固定されている。 As shown in FIG. 3, the battery tray 7 is formed in a substantially Z shape when viewed in the cross-sectional direction, and is formed of a thin metal plate along the shape of the case 2 a of the battery pack 2 when viewed from the bottom. Further, the battery tray 7 is formed with a deformed portion 7a having a relatively low rigidity with which the end of the battery cross member upper 4 abuts.
Further, the battery cross member upper 4 is welded to the upper surface of the corresponding mounting portion 5 of the front battery cross member lower 5 and the mounting portion 6a of the rear battery cross member lower 6, and the end surface of the battery cross member upper 4 and the battery tray 7 deformation part 7a is welded and fixed.

そして、フロントバッテリクロスメンバロア５及びリヤバッテリクロスメンバロア６は、バッテリクロスメンバアッパ４を介して一対のサイドメンバ３に図示しないボルトで固定される。
また、バッテリトレー７上にバッテリパック２が載置され、図示しないボルトで固定される。 The front battery cross member lower 5 and the rear battery cross member lower 6 are fixed to the pair of side members 3 with bolts (not shown) via the battery cross member upper 4.
Further, the battery pack 2 is placed on the battery tray 7 and fixed with a bolt (not shown).

特に、本実施形態では、上記のようにバッテリトレー７が変形部７ａにおいて車体外方向へ膨らむように形成されているので、ケース２ａの側壁とバッテリトレー７の変形部７ａとの間に空間が設けられる。そして、バッテリトレー７には、バッテリパック２とバッテリクロスメンバアッパ４との間に、剛性が比較的低い変形部７ｂが形成されている。
以下、このように構成された本発明の参考例に係る電気自動車のバッテリ搭載構造の作用及び効果について説明する。 In particular, in the present embodiment, since the battery tray 7 is formed so as to swell outward in the vehicle body at the deformed portion 7a as described above, there is a space between the side wall of the case 2a and the deformed portion 7a of the battery tray 7. Provided. In the battery tray 7, a deformed portion 7 b having a relatively low rigidity is formed between the battery pack 2 and the battery cross member upper 4.
Hereinafter, the operation and effect of the battery mounting structure of the electric vehicle according to the reference example of the present invention configured as described above will be described.

図５は、車両の側方からの衝突後の図２のＢ部の拡大図を示しており、図中太矢印は、車両衝突時の荷重入力方向を示している。なお、図中矢印「上」は車体上方向を、矢印「横」は車体幅方向をそれぞれ示す。
図５に示すように、車体１の側方からの衝突時にサイドメンバ３或いはバッテリクロスメンバアッパ４に荷重が加わると、バッテリクロスメンバアッパ４からフロントバッテリクロスメンバロア５或いはリヤバッテリクロスメンバロア６及びバッテリトレー７に荷重が伝達される。本実施形態では、バッテリクロスメンバアッパ４がケース２ａの側壁に直接固定されておらず、バッテリパック２とバッテリクロスメンバアッパ４との間に空間を有しており、バッテリトレー７の変形部７ａの剛性が比較的低いので、側方からの衝突時にはバッテリトレー７の変形部７ａが車体１の内側方向の空間７ｂへ変形して、衝突時の荷重を吸収する。 FIG. 5 shows an enlarged view of a portion B in FIG. 2 after a collision from the side of the vehicle, and a thick arrow in the drawing indicates a load input direction at the time of the vehicle collision. In the figure, the arrow “up” indicates the vehicle body upward direction, and the arrow “horizontal” indicates the vehicle body width direction.
As shown in FIG. 5, when a load is applied to the side member 3 or the battery cross member upper 4 at the time of a collision from the side of the vehicle body 1, the front battery cross member lower 5 or the rear battery cross member lower 6 from the battery cross member upper 4. The load is transmitted to the battery tray 7. In the present embodiment, the battery cross member upper 4 is not directly fixed to the side wall of the case 2a, but has a space between the battery pack 2 and the battery cross member upper 4, and the deformed portion 7a of the battery tray 7 is provided. Since the rigidity of the battery tray 7 is relatively low, the deformed portion 7a of the battery tray 7 is deformed into the space 7b in the vehicle body 1 at the time of a collision from the side to absorb the load at the time of the collision.

このように、車体１の側方からの衝突時には、変形部７ａが変形するようにしており、バッテリクロスメンバアッパ４とバッテリパック２との間に空間７ｂが設けられているので、バッテリトレー７の変形部７ａが変形することで、バッテリクロスメンバアッパ４が変形して荷重を直接バッテリパック２に入力させないため、例えば、バッテリクロスメンバアッパ４が車体１の内側方向に移動しても、バッテリパック２との接触を少なくすることができ、バッテリパック２の損傷を軽減することができる。
［第１実施例］
以下、本発明の第１実施例における電気自動車のバッテリ搭載構造を説明する。 As described above, when the vehicle body 1 collides from the side, the deformable portion 7a is deformed, and the space 7b is provided between the battery cross member upper 4 and the battery pack 2. Therefore, the battery tray 7 Since the battery cross member upper 4 is deformed and the load is not directly input to the battery pack 2 due to the deformation of the deforming portion 7a, for example, even if the battery cross member upper 4 moves inward of the vehicle body 1, the battery Contact with the pack 2 can be reduced, and damage to the battery pack 2 can be reduced.
[First embodiment]
Hereinafter, the battery mounting structure of the electric vehicle according to the first embodiment of the present invention will be described.

第１実施例では、参考例に対して、バッテリクロスメンバアッパ４’とバッテリトレー７’の形状が異なる。以下に参考例からの変更点について説明する。
図６は、本発明の第１実施例に係る電気自動車のバッテリ搭載構造が適用された車体の車体中央の下面視図を示している。また、図７は、図６の矢視Ａ’−Ａ’線での断面図を示している。そして、図８は、図７のＢ’部の拡大図を示している。なお、図中矢印「上」は車体上方向、矢印「前」は車体前方向、矢印「横」は車体幅方向をそれぞれ示している。 In the first embodiment, the shapes of the battery cross member upper 4 ′ and the battery tray 7 ′ are different from those of the reference example. The changes from the reference example will be described below.
FIG. 6 is a bottom view of the center of the vehicle body to which the battery mounting structure for an electric vehicle according to the first embodiment of the present invention is applied. FIG. 7 shows a cross-sectional view taken along line A′-A ′ in FIG. FIG. 8 shows an enlarged view of a portion B ′ in FIG. In the figure, the arrow “up” indicates the vehicle body upward direction, the arrow “front” indicates the vehicle body front direction, and the arrow “lateral” indicates the vehicle body width direction.

図６から図８に示すように、バッテリクロスメンバアッパ４’は、下方が開口した断面コの字型の棒状に形成されている。また、バッテリクロスメンバアッパ４’のサイドメンバ２への取付時の車体外側方向上側に取付部４ａ’が形成されている。更にサイドメンバ２への取付時の車体内側方向に取付部４ａ’より高さが低く断面積の小さい変形部４ｂ’が形成されている。そして、取付部４ａ’と変形部４ｂ’は、バッテリクロスメンバアッパ４’の中央でスロープ４ｃ’にて接続されている。   As shown in FIGS. 6 to 8, the battery cross member upper 4 ′ is formed in a U-shaped bar shape having an open bottom. Further, an attachment portion 4a 'is formed on the upper side in the vehicle body outer direction when the battery cross member upper 4' is attached to the side member 2. Further, a deformed portion 4b 'having a lower height and a smaller cross-sectional area than the mounting portion 4a' is formed in the vehicle body inner side direction when being attached to the side member 2. The attachment portion 4a 'and the deformation portion 4b' are connected by a slope 4c 'at the center of the battery cross member upper 4'.

バッテリトレー７’は、断面方向視で略Ｚ字状に形成され、下面視でバッテリパック２のケース２ａの形状に沿った金属の薄板で形成されている。また、バッテリトレー７’には、バッテリクロスメンバアッパ４’の端部が当接する接続部７ａ’が形成されている。
更に、バッテリクロスメンバアッパ４が、対応するフロントバッテリクロスメンバロア５の取付部５及びリヤバッテリクロスメンバロア６の取付部６ａの上面に溶接されるとともに、バッテリクロスメンバアッパ４’の端面とバッテリトレー７’の接続部７ａ’とが溶接されて固定されている。 The battery tray 7 ′ is formed in a substantially Z shape when viewed in the cross-sectional direction, and is formed of a thin metal plate along the shape of the case 2 a of the battery pack 2 when viewed from the bottom. Further, the battery tray 7 ′ is formed with a connecting portion 7a ′ with which the end of the battery cross member upper 4 ′ abuts.
Further, the battery cross member upper 4 is welded to the upper surface of the corresponding mounting portion 5 of the front battery cross member lower 5 and the mounting portion 6a of the rear battery cross member lower 6, and the end surface of the battery cross member upper 4 'is connected to the battery. The connecting portion 7a 'of the tray 7' is welded and fixed.

そして、フロントバッテリクロスメンバロア５及びリヤバッテリクロスメンバロア６は、バッテリクロスメンバアッパ４’を介して一対のサイドメンバ３に図示しないボルトで固定される。
また、フロントバッテリクロスメンバロア５及びリヤバッテリクロスメンバロア６上にバッテリトレー７’が載置されるとともに、バッテリトレー７’上にバッテリパック２が載置され、図示しないボルトで固定される。 The front battery cross member lower 5 and the rear battery cross member lower 6 are fixed to the pair of side members 3 with bolts (not shown) via the battery cross member upper 4 '.
In addition, the battery tray 7 ′ is placed on the front battery cross member lower 5 and the rear battery cross member lower 6, and the battery pack 2 is placed on the battery tray 7 ′ and fixed by bolts (not shown).

以下、このように構成された本発明の第１実施例に係る電気自動車のバッテリ搭載構造の作用及び効果について説明する。
図９は、車両の側方からの衝突後の図７のＢ’部の拡大図を示しており、図中太矢印は、車両衝突時の荷重入力方向を示している。なお、図中矢印「上」は車体上方向を、矢印「横」は車体幅方向をそれぞれ示す。 Hereinafter, the operation and effect of the battery mounting structure for an electric vehicle according to the first embodiment of the present invention configured as described above will be described.
FIG. 9 shows an enlarged view of a portion B ′ in FIG. 7 after a collision from the side of the vehicle, and a thick arrow in the drawing indicates a load input direction at the time of the vehicle collision. In the figure, the arrow “up” indicates the vehicle body upward direction, and the arrow “horizontal” indicates the vehicle body width direction.

図９に示すように、車体１’の側方からの衝突時にサイドメンバ３或いはバッテリクロスメンバアッパ４’に荷重が加わると、バッテリクロスメンバアッパ４’は、バッテリクロスメンバアッパ４’の変形部４ｂ’の断面積が取付部４ａ’の断面積よりも小さいために、断面積の小さい変形部４ｂ’で車体１’の内側方向に変形し、衝突時の荷重を吸収する。   As shown in FIG. 9, when a load is applied to the side member 3 or the battery cross member upper 4 ′ at the time of a collision from the side of the vehicle body 1 ′, the battery cross member upper 4 ′ becomes a deformed portion of the battery cross member upper 4 ′. Since the cross-sectional area of 4b ′ is smaller than the cross-sectional area of the mounting portion 4a ′, the deformed portion 4b ′ having a small cross-sectional area is deformed inward of the vehicle body 1 ′ to absorb the load at the time of collision.

従って、車体１’の側方からの衝突時に変形部４ｂ’で変形をするようにしているので、バッテリクロスメンバアッパ４’を変形させて荷重を直接バッテリパック２へ入力させないため、例えば、バッテリクロスメンバアッパ４’が車体の内側方向に変形しても、バッテリパック２との接触を少なくすることができ、バッテリパックの損傷を軽減することができる。   Therefore, since the deforming portion 4b ′ is deformed at the time of a collision from the side of the vehicle body 1 ′, the battery cross member upper 4 ′ is not deformed and the load is not directly input to the battery pack 2. For example, the battery Even if the cross member upper 4 ′ is deformed inward of the vehicle body, the contact with the battery pack 2 can be reduced, and damage to the battery pack can be reduced.

以上で本発明の実施形態の説明を終えるが、本発明の実施形態は上記実施形態に限定されるものではない。
上記参考例では、バッテリクロスメンバアッパ４とバッテリパック２との間に空間を形成して変形部とし、また第１実施例では、バッテリクロスメンバアッパ４’の断面積を減少させて変形部として、それぞれ変形部にて変形をするようにしているが、これに限定されるものではなく、例えば、他部位に対して変形部の断面形状を断面強度が低下するような形状とし、変形部で変形するようにしても問題なく、本実施形態と同様の効果を得ることができることは言うまでもない。 This is the end of the description of the embodiment of the present invention. However, the embodiment of the present invention is not limited to the above embodiment.
In the above reference example, a space is formed between the battery cross member upper 4 and the battery pack 2 to form a deformed portion, and in the first embodiment, the cross-sectional area of the battery cross member upper 4 ′ is reduced to form a deformed portion. Each of the deformed portions is deformed, but is not limited to this. For example, the deformed portion has a cross-sectional shape that reduces the cross-sectional strength with respect to other parts. Needless to say, it is possible to obtain the same effect as the present embodiment without any problem even if it is modified.

１，１’ 車体
２ バッテリパック
３ サイドメンバ
４，４’ バッテリクロスメンバアッパ
５ フロントバッテリクロスメンバロア
６ リヤバッテリクロスメンバロア
７，７’ バッテリトレー 1, 1 'Car body 2 Battery pack 3 Side member 4, 4' Battery cross member upper 5 Front battery cross member lower 6 Rear battery cross member lower 7, 7 'Battery tray

Claims (3)

車体の両側部に前後方向に延在する一対のサイドメンバの間にバッテリパックが配設され、前記バッテリパックは、車体横方向に延在する複数のバッテリクロスメンバを介して前記サイドメンバに固定される電気自動車のバッテリ搭載構造において、
前記バッテリクロスメンバは、下方向に開口する断面コの字状のバッテリクロスメンバアッパと前記バッテリクロスメンバアッパの下面に固定された平板状のバッテリクロスメンバロアとからなり、
前記バッテリクロスメンバアッパは、前記サイドメンバに取り付けられる取付部と、前記取付部より高さが低く断面積の小さい変形部と、前記取付部と前記変形部とを接続するスロープとで形成されることを特徴とする電気自動車のバッテリ搭載構造。 A battery pack is disposed between a pair of side members extending in the front-rear direction on both sides of the vehicle body, and the battery pack is fixed to the side member via a plurality of battery cross members extending in the vehicle body lateral direction. In the electric vehicle battery mounting structure,
The battery cross member comprises a battery cross member upper having a U-shaped cross section that opens downward, and a flat battery cross member lower fixed to the lower surface of the battery cross member upper,
The battery cross member upper is formed by an attachment portion attached to the side member, a deformation portion having a height lower than the attachment portion and having a small cross-sectional area, and a slope connecting the attachment portion and the deformation portion. The battery mounting structure of the electric vehicle characterized by the above-mentioned. 前記バッテリパックは、前記バッテリクロスメンバロアに載置されることを特徴とする、請求項１に記載の電気自動車のバッテリ搭載構造。   The battery mounting structure for an electric vehicle according to claim 1, wherein the battery pack is mounted on the battery cross member lower. 前記バッテリパックを載置すると共に前記バッテリクロスメンバロアに載置されるバッテリトレーを有し、
前記バッテリクロスメンバアッパは、前記バッテリトレーに接続されることを特徴とする、請求項２に記載の電気自動車のバッテリ搭載構造。 A battery tray for mounting the battery pack and mounted on the battery cross member lower;
The battery mounting structure for an electric vehicle according to claim 2, wherein the battery cross member upper is connected to the battery tray.
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