JP2022128961A - In-car battery pack - Google Patents

Abstract

To provide an in-car battery pack which can inhibit a battery case from being deformed significantly and achieve weight reduction.SOLUTION: An in-car battery pack 20 includes a battery case 71 which houses batteries 75. The battery case includes a case frame body 81, first stays 82, and second stays 83. The case frame body is formed into a frame-like shape by a front frame 92, a rear frame 93, a right frame, and a left frame. Each first stay is provided at the front frame and has a first stay contour part 121 which is deformed to the upper outer side relative to the front frame. Each second stay is provided at the rear frame and has a second stay contour part 155 which deforms to the upper outer side relative to the rear frame.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle-mounted battery pack.

A vehicle-mounted battery pack includes, for example, a battery case placed under the floor of a vehicle and housing a plurality of batteries. According to this battery pack, for example, in the event of a frontal collision of the vehicle, a collision load input from the front side of the vehicle is transmitted to the battery case. In this case, the collision load is transmitted to the dash cross member through the connecting portion between the front wall portion of the battery case and the dash cross member. The transmitted collision load is distributed in the width direction of the vehicle via the dash cross member (see, for example, Patent Document 1).

JP 2019-18732 A

Here, the vehicle-mounted battery pack is generally a heavy object. Therefore, in the battery pack described in Patent Document 1, for example, the strength and rigidity of the front wall portion of the battery case are formed high. Therefore, when a collision load is applied to the front wall of the battery case from the front of the vehicle, the front wall may be crushed or deformed by the applied collision load to damage (damage) the battery case.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle-mounted battery pack capable of suppressing deformation of the battery case and achieving weight reduction.

In order to solve the above problems, the present invention proposes the following means.
(1) A vehicle-mounted battery pack according to the present invention is mounted under the floor of a vehicle (for example, vehicle Ve in the embodiment) and houses a plurality of batteries (for example, battery 75 in the embodiment) in a battery case (for example, The battery case 71 of the embodiment) includes a front wall (eg, the front frame 92 of the embodiment), a rear wall (eg, the rear frame 93 of the embodiment), left and right side walls (eg, the A frame (for example, the case frame 81 of the embodiment) formed in a frame shape by a right frame 94 and a left frame 95) in which the battery is arranged, and a frame provided on at least one of the front wall and the rear wall. a stay (for example, the first stay 82 and the second stay 83 of the embodiment) that protrudes in a direction away from at least one of the front wall and the rear wall in the longitudinal direction of the vehicle body; At least one of the wall and the rear wall has a contour portion (eg, the first stay contour portion 121 and the second stay contour portion 155 of the embodiment) that deforms outward in the vertical direction.

According to this configuration, the stay is provided on at least one of the front wall and the rear wall, and the stay has a contoured portion. The contoured portion is formed to deform (bend) outward in the vertical direction with respect to at least one of the front wall and the rear wall.
Therefore, for example, when a collision load is input to the stay due to a frontal collision or a rearward collision, the input collision load can deform the stay so as to bend outward with respect to at least one of the front wall and the rear wall. can. As a result, the stay can be deformed so as to be favorably crushed while keeping the remaining amount of stay crushed to a minimum. In addition, the stay can preferably absorb impact energy due to collision. Therefore, deformation of the battery case can be kept small. As a result, damage to the battery case can be minimized, and the battery can be protected from impact loads.

Furthermore, for example, when a collision load is input to the stay, deformation of the stay can reduce the collision load that is input (acts) to at least one of the front wall and the rear wall. As a result, it is not necessary to increase the resistance to collision load (that is, strength and rigidity) in at least one of the front wall and the rear wall, and the weight of the battery case (that is, the battery pack) can be reduced.

(2) The stay is displaced upward and outward from the upper surface (for example, the upper surface portion 93b of the embodiment) of at least one of the front wall and the rear wall (for example, the rear frame 93 of the embodiment). It is supported by an upper wall (for example, the second stay upper wall 162 of the embodiment) and at least one of the front wall and the rear wall, and slopes upward as it moves away from at least one of the front wall and the rear wall in the longitudinal direction of the vehicle body. an inclined wall (for example, the second stay inclined wall 163 in the embodiment), and at least one portion of the upper wall, the inclined wall, and the front wall and the rear wall (for example, the The contour (for example, the second stay contour 155 of the embodiment) may form a triangular closed cross-section due to the second stay base end wall 161).

According to this configuration, the stay has the upper wall and the inclined wall, and the upper wall is displaced (offset) outward from the upper surface of at least one of the front wall and the rear wall. Therefore, for example, when a collision load is input to the stay due to a frontal collision or a rearward collision, the input collision load can deform the upper wall so as to bend upward.
Furthermore, the slanted wall was slanted upward with increasing distance from at least one of the front wall and the rear wall. Therefore, when a collision load is input to the stay, part of the input collision load is converted into an upward load by the inclined wall. Therefore, the stay can be deformed so as to bend upward. As a result, the stay can be deformed so as to be favorably crushed while keeping the remaining amount of stay crushed to a minimum. Therefore, the impact energy from the collision can be suitably absorbed by the stay, and the deformation of the battery case can be kept small. As a result, damage to the battery case can be minimized, and the battery can be protected from impact loads.

At least one of the upper wall, the inclined wall, and the front wall and the rear wall formed a triangular (including substantially triangular) closed cross section. Therefore, the strength and rigidity of the stay can be enhanced. As a result, for example, in a state in which the top wall is fixed to the vehicle body via the fixing bracket (fixing portion), the stay (especially the inclined wall) can support the heavy battery pack.

(3) The upper wall may be thicker than the inclined wall.

According to this configuration, by making the thickness of the upper wall larger than that of the inclined wall, for example, surface rigidity (rigidity) against a vertical load applied to the upper wall from above can be ensured. Further, for example, in a state in which a fixing bracket is attached to the upper surface and the fixing bracket is fixed to the vehicle body, the upper wall can be supported in a gapped state by the inclined wall. Therefore, the vertical rigidity of the stay can be ensured by the inclined wall.
In this way, the surface rigidity of the upper wall is ensured, and the rigidity in the vertical direction with respect to the stay is ensured by the inclined wall, so that the battery pack, which is a heavy object, can be supported by the stay.

(4) the battery case is arranged below a front floor panel (for example, the front floor panel 33 of the embodiment) of floor panels (for example, the floor panel 23 of the embodiment) forming the floor of the vehicle; The stay is attached to a fixing bracket (for example, the fixing bracket 102 in the embodiment) suspended from a rear floor panel (for example, the rear floor panel 34 in the embodiment) adjacent to the rear of the vehicle body of the front floor panel. A shaped second stay top wall 162) may be attached.

According to this configuration, the upper wall of the stay is attached to a fixed bracket suspended from the rear floor panel. Therefore, for example, the stay can be arranged at a position projecting rearward of the vehicle body from the rear end portion of the front floor panel. As a result, the battery case can be made large up to the rear end of the front floor panel, and the battery capacity of the battery pack can be increased.

(5) The stay has an upper wall (for example, the first stay upper wall 132 in the embodiment) and a lower wall (for example, the first stay upper wall 132 in the embodiment) forming the contoured portion (for example, the first stay contoured portion 121 in the embodiment). a first stay lower wall 133) and a partition provided between the upper wall and the lower wall (for example, the first partition 122 and the first partition 122 of the embodiment), the upper wall and the One of the lower walls (for example, the first stay lower wall 133 in the embodiment) is longer in the longitudinal direction of the vehicle body than the other (for example, the first stay upper wall 132 in the embodiment), and one of the lower walls has a bent portion (for example, the , the bent portion 138 of the embodiment), the partition wall is formed to intersect the upper wall and the lower wall, and the inside of the contour portion is the partition wall and a plurality of hollow chambers (for example, the hollow chamber of the embodiment) 142).

According to this configuration, the total length of one of the upper wall and the lower wall is formed longer than the other in the longitudinal direction of the vehicle body, and one of the walls is formed with a bent portion. Therefore, for example, when a collision load is input to the stay, the stay can be deformed so as to bend toward the outside of at least one of the front wall and the rear wall, starting from the bent portion. Furthermore, partition walls were made to intersect (perpendicularly) the upper wall and the lower wall. Therefore, it is possible to transmit one bending originating from the bent portion to the other.
As a result, the stay can be deformed so as to be preferably bent toward the outer side of at least one of the front wall and the rear wall, and the remaining portion of the stay after being crushed can be reduced. In addition, the stay can preferably absorb impact energy due to collision. Therefore, deformation of the battery case can be kept small, and damage to the battery case can be kept small.

(6) The partition may be provided at the bent portion.

According to this configuration, by providing the partition wall at the bent portion, for example, the collision load input to the stay can be concentrated on the bent portion. Therefore, bending deformation can be caused from the bent portion as a starting point, and the bending deformation of the bent portion can be transmitted to the other of the upper wall and the lower wall via the partition wall. As a result, the bending of one side originating from the bent portion can be rapidly transmitted to the other side, and the stay can be deformed so as to be suitably bent, so that the remaining portion of the stay after being crushed can be kept to a minimum.
In addition, by forming the stay with the upper wall, the lower wall, and the partition wall, for example, the stay can be extruded from an aluminum alloy, and the strength and rigidity in the vertical direction and the longitudinal direction of the stay can be easily balanced.

(7) The stay is a collision wall (for example, the first stay front end wall 134 in the embodiment) that is provided on the front end wall (for example, the first stay front end wall 134 in the embodiment) and receives a load due to collision (for example, the frontal collision load F1 in the embodiment). 145), and the collision wall may be provided at a position close to one of the upper wall and the lower wall having the bent portion (for example, the first stay lower wall 133 in the embodiment). .

According to this configuration, the collision wall is formed on the tip wall of the stay, and the collision wall is provided at a position near one of the upper wall and the lower wall having the bent portion. Therefore, the collision load input to the stay can be received by the collision wall, and the collision load received by the collision wall can be quickly concentrated on the bent portion. As a result, the stay can be deformed so as to be quickly bent, and the remaining portion of the stay after being crushed can be reduced.

(8) The stay has a weakened portion (for example, the weakened portion 148 in the embodiment) on one of the upper wall and the lower wall (for example, the first stay lower wall 133 in the embodiment) having the bent portion. may

According to this configuration, the stay has the weakened portion, and the weakened portion is formed in one of the upper wall and the lower wall having the bent portion. As a result, the bending deformation of the stay can be increased by deforming the fragile portion due to the collision load applied to the stay.

(9) The stay may be set longer in the longitudinal direction of the vehicle body than the vertical height of at least one of the front wall and the rear wall (for example, the front frame 92 of the embodiment).

According to this configuration, the length of the stay in the longitudinal direction of the vehicle body is set longer than the height of at least one of the front wall and the rear wall in the vertical direction. Therefore, for example, the stay can be arranged at the front end of the front floor panel in a state in which the front floor panel is formed with a protruding portion that is one step higher than the front end of the front floor panel. As a result, the stay can be fixed to the front end portion of the front floor panel in a state where the battery case is housed in the raised portion of the front floor panel, and both passenger space and battery capacity can be achieved.

(10) A vertical frame (for example, the first vertical frame 86 and the second vertical frame 87 of the embodiment) extending in the longitudinal direction of the vehicle body is provided in the battery case to support the battery, and the stay is a vertical frame. It may be aligned on an extension of the frame (eg, extension 149 in the embodiment).

According to this configuration, the battery case is provided with the vertical frame, and the stays are aligned on the extension of the vertical frame. Therefore, the vertical frame supports the battery and also serves to reinforce at least one of the front wall and the rear wall that support the stay. As a result, for example, the collision load applied to the stay can be supported by the vertical frame, and the stay can be deformed so as to be suitably bent by the collision load, thereby reducing the amount of remaining collapse of the stay. Therefore, for example, a reinforcing member (additional member) that reinforces at least one of the front wall and the rear wall can be made unnecessary, and the weight of the battery case (that is, the battery pack) can be reduced.

According to the present invention, the stay is provided on at least one of the front wall and the rear wall, and the outline of the stay is formed so as to deform outward in the vertical direction with respect to at least one of the front wall and the rear wall. As a result, the deformation of the battery case can be suppressed, and the weight of the battery case can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle mounted with a vehicle-mounted battery pack according to one embodiment of the present invention, as viewed obliquely from the front; FIG. 2 is a bottom view showing a vehicle equipped with the vehicle-mounted battery pack according to the embodiment; FIG. 2 is a cross-sectional view taken along line III-III of a vehicle equipped with the vehicle-mounted battery pack of FIG. 1; 1 is a perspective view showing a state in which a case cover is removed from a vehicle-mounted battery pack according to one embodiment; FIG. FIG. 5 is a perspective view showing a case main body of the vehicle-mounted battery pack of FIG. 4 ; 4 is an enlarged cross-sectional view of the first stay shown in the VI section of FIG. 3; FIG. FIG. 7 is a perspective view showing part of the first stay of FIG. 6; FIG. 4 is a perspective view showing a second stay of the vehicle-mounted battery pack of one embodiment; FIG. 4 is an enlarged cross-sectional view of a second stay shown in the IX section of FIG. 3; FIG. 7 is a cross-sectional view for explaining an example in which the first stay of FIG. 6 is deformed so as to be crushed upward and outward by a frontal collision load; FIG. 11 is a cross-sectional view illustrating an example in which the first stay of FIG. 10 is deformed so as to be crushed to the upper outer space; FIG. 10 is a cross-sectional view illustrating an example in which the second stay of FIG. 9 is deformed so as to be crushed upward and outward by a rear impact load; FIG. 13 is a cross-sectional view for explaining an example in which the second stay of FIG. 12 is deformed so as to be crushed to the upper outer space;

A vehicle-mounted battery pack according to an embodiment of the present invention will be described below with reference to the drawings. In the drawings, arrow FR indicates the front of the vehicle, arrow UP indicates the upper side of the vehicle, and arrow LH indicates the left side of the vehicle. Although the vehicle is not particularly limited in application, type, etc., an automobile will be described as an example of one embodiment. In addition, the vehicle has a generally bilaterally symmetrical configuration. Therefore, the same reference numerals are assigned to the left and right constituent members in the following description.

<Vehicle>
As shown in FIGS. 1 to 3, the vehicle Ve includes a vehicle body (hereinafter sometimes referred to as a vehicle body 10) 10 and a vehicle-mounted battery pack 20. As shown in FIGS. Hereinafter, the vehicle-mounted battery pack 20 may be simply referred to as "battery pack 20".

<Vehicle body>
The vehicle body 10 includes a side sill unit 22, a floor panel 23, a floor tunnel 24, a front side frame unit 25, a rear frame unit 26, a floor cross member unit 27, and a floor vertical frame unit 28. there is

The side sill unit 22 includes a right side sill 31 and a left side sill 31. - 特許庁The right side sill 31 is a highly rigid member that is formed with a closed cross section and constitutes part of the skeleton of the vehicle body 10 . The right side sill 31 is provided on the right outer side in the vehicle width direction and extends in the longitudinal direction of the vehicle body along the right outer portion of the floor panel 23 in the vehicle width direction.
The left side sill 31 is a highly rigid member that is formed to have a closed cross section and constitutes part of the frame of the vehicle body 10 . The left side sill 31 is provided on the left outer side in the vehicle width direction and extends in the longitudinal direction of the vehicle body along the left outer portion of the floor panel 23 in the vehicle width direction.

A floor panel 23 is provided between the left side sill 31 and the right side sill 31 . The floor panel 23 forms the floor of the vehicle Ve and includes a front floor panel 33 and a rear floor panel 34 . The front floor panel 33 is provided between the dashboard lower 35 and a fourth floor cross member 47 (described later) in the longitudinal direction of the vehicle body, and is a substantially rectangular plate-like member in a plan view. The front floor panel 33 forms, for example, the floor of the passenger compartment (passenger space).
A floor tunnel 24 extends in the longitudinal direction of the vehicle body at the center of the front floor panel 33 in the vehicle width direction. The floor tunnel 24 is raised upward from the front floor panel 33 .
The rear floor panel 34 is adjacent to the rear end portion 33a of the front floor panel 33 at the rear of the vehicle body, and extends from the fourth floor cross member 47 toward the rear of the vehicle body. The rear floor panel 34 forms, for example, the floor of the luggage compartment.

The front side frame unit 25 includes a right front side frame 36 and a left front side frame 36 . The right front side frame 36 and the left front side frame 36 are provided in front of the vehicle body from the battery pack 20 .
The rear frame unit 26 includes a right rear frame 41 and a left rear frame 41 . Right rear frame 41 and left rear frame 41 are provided behind battery pack 20 in the vehicle body.

The floor cross member unit 27 is arranged between the right side sill 31 and the left side sill 31 and joined along the upper surface of the front floor panel 33 .
The floor cross member unit 27 includes a right first floor cross member 44, a left first floor cross member 44, a right second floor cross member 45, a left second floor cross member 45, and a right second floor cross member 45. A third floor cross member 46 , a left third floor cross member 46 and a fourth floor cross member 47 are provided.
The floor tunnel 24 intersects (perpendicularly in the embodiment) the left and right first floor cross members 44, the left and right second floor cross members 45, and the left and right third floor cross members 46, and extends in the longitudinal direction of the vehicle body. extended.

The floor vertical frame unit 28 includes a plurality of first to fourth floor vertical frames 55 to 58 provided on the floor panel 23 at intervals in the vehicle width direction. Specifically, the first floor vertical frame 55 and the second floor vertical frame 56 are provided on the right side of the floor tunnel 24 in the floor panel 23 with an interval in the vehicle width direction. The third floor vertical frame 57 and the fourth floor vertical frame 58 are provided on the left side of the floor tunnel 24 in the floor panel 23 with an interval in the vehicle width direction. Battery pack 20 is provided below floor panel 23 (in particular, front floor panel 33).

<Battery pack>
As shown in FIGS. 3 to 5, the battery pack 20 is mounted under the floor of the vehicle Ve (specifically, under the front floor panel 33). The battery pack 20 includes a battery case (battery case) 71 , a battery module 72 , and a battery auxiliary device 73 .
(battery case)
The battery case 71 is provided below the front floor panel 33 of the floor panels 23 forming the floor of the vehicle Ve, and houses the battery modules 72 (that is, the plurality of batteries 75). The battery case 71 has a case body 76 and a case cover 77 .
The case body 76 includes a case frame (frame) 81, a pair of first stays (stays) 82, a pair of second stays (stays) 83, a case portion 84, a lower cross member 85, and a first stay. A vertical frame (vertical frame) 86 , a second vertical frame (vertical frame) 87 , an upper cross member 88 and an upper deck 89 are provided.

The case frame 81 includes a front frame (front wall) 92, a rear frame (rear wall) 93, a right frame (right wall) 94, a left frame (left wall) 95, a right tilt frame 96, and a left tilt. a frame 97;
The front frame 92 extends in the vehicle width direction while being spaced forward of the vehicle body with respect to the front side of the battery module 72 . The rear frame 93 is spaced rearward of the vehicle body with respect to the rear side of the battery module 72 and extends in the vehicle width direction.
The right frame 94 is spaced rightward in the vehicle width direction from the right side of the battery module 72 and extends from the right end of the front frame 92 toward the rear of the vehicle body. The right frame 94 and rear frame 93 are connected by a right tilt frame 96 .
The left frame 95 is spaced leftward in the vehicle width direction from the left side of the battery module 72 and extends from the left end of the front frame 92 toward the rear of the vehicle body. The left frame 95 and the rear frame 93 are connected by a left tilt frame 97 .

The case frame body 81 is formed in a substantially rectangular frame shape in a plan view by a front frame 92, a rear frame 93, a left frame 95, a right frame 94, a right inclined frame 96, and a left inclined frame 97, and has a battery module therein. 72 are arranged. That is, the case frame 81 is formed so as to cover (surround) the outer periphery of the battery module 72 with a space therebetween.

As shown in FIGS. 2, 3, and 5, the front frame 92 is provided with a pair of first stays 82 spaced apart in the vehicle width direction and projecting forward of the vehicle body. The right first stay 82 of the pair of first stays 82 is attached from below to the right branch portion 38 extending from the rear portion 36 a of the right front side frame 36 .
The left first stay 82 of the pair of first stays 82 is attached from below to the left branch portion 38 extending from the rear portion 36 a of the left front side frame 36 .
That is, the front frame 92 is attached to the right branch portion 38 and the left branch portion 38 from below via the pair of first stays 82 . Note that the first stay 82 will be described later in detail.

A pair of second stays 83 are provided on the rear frame 93 at intervals in the vehicle width direction and protrude toward the rear of the vehicle body. The right second stay 83 of the pair of second stays 83 is attached from below to the fourth floor cross member 47 (see FIG. 1) via a right fixing bracket (fixing portion) 102 .
The left second stay 83 of the pair of second stays 83 is attached to the fourth floor cross member 47 from below via a left fixing bracket (fixing portion) 102 .
That is, the rear frame 93 is attached to the fourth floor cross member 47 (see FIG. 1) from below via the pair of second stays 83, the right fixing bracket 102, and the left fixing bracket 102. As shown in FIG. Note that the second stay 83 will be described later in detail.

The right frame 94 is attached to the right side sill 31 from below. The left frame 95 is attached to the left side sill 31 from below.
In this manner, the case frame 81 is attached to the bottom of the vehicle (that is, the right branch 38, the left branch 38, the fourth floor cross member 47, the right side sill 31, and the left side sill 31) from below. It is

As shown in FIG. 5 , the case frame 81 is attached to the outer periphery of the case portion 84 . The case portion 84 is provided inside the case frame 81 and attached while being surrounded by the case frame 81 . The case portion 84 has a case bottom portion (bottom surface of the battery pack 20) 105 provided below the battery module 72 (see FIG. 4). The case portion 84 is provided with a lower cross member 85 , a plurality of first vertical frames 86 and a plurality of second vertical frames 87 .

The lower cross member 85 is arranged in the center of the case portion 84 in the front-rear direction of the vehicle body and extends in the vehicle width direction. In front of the lower cross member 85 in the case bottom portion 105, a plurality of first vertical frames 86 are provided at intervals in the vehicle width direction. A plurality of second vertical frames 87 are provided at intervals in the vehicle width direction on the rear side of the lower cross member 85 in the case bottom portion 105 .
The plurality of first vertical frames 86 and the plurality of second vertical frames 87 are arranged on the same line with a gap in the longitudinal direction of the vehicle body. A lower cross member 85 is provided between the plurality of first vertical frames 86 and the plurality of second vertical frames 87 .
Although one lower cross member 85 is exemplified in the embodiment, the number of lower cross members 85 can be appropriately selected. Further, in the embodiment, five are exemplified as the plurality of first vertical frames 86 and five are exemplified as the plurality of second vertical frames 87, but the number of the first vertical frames 86 and the number of the second vertical frames 87 are appropriately A choice is possible.

The front end of the first vertical frame 86 is attached to the case portion 84 with a first attachment bracket 107 . The first vertical frame 86 has a rear end attached to the lower cross member 85 . That is, the first vertical frame 86 extends in the longitudinal direction of the vehicle body.
A battery 75 (see FIG. 4) is arranged vertically between a pair of adjacent first vertical frames 86 , and the vertically arranged battery 75 is supported by the pair of first vertical frames 86 .

The second vertical frame 87 has a rear end portion attached to the case portion 84 with a second attachment bracket 108 . The second vertical frame 87 has a front end attached to the lower cross member 85 . That is, the second vertical frame 87 extends in the longitudinal direction of the vehicle body.
A battery 75 is arranged vertically between a pair of adjacent second vertical frames 87 , and the vertically arranged battery 75 is supported by the pair of second vertical frames 87 .
The battery 75 is formed into a vertically long rectangular body by stacking a plurality of battery cells (not shown) in the longitudinal direction. Hereinafter, the vertically long battery 75 may be referred to as "vertically long battery 75".
In addition, arranging the vertically long battery 75 vertically means arranging the battery 75 so that the longitudinal direction of the battery 75 faces the front-rear direction (longitudinal direction) of the vehicle body.

In this manner, a plurality of first vertical frames 86 and a plurality of second vertical frames 87 are provided on the case portion 84 at intervals in the longitudinal direction of the vehicle body. Further, a lower cross member 85 is provided between the multiple first vertical frames 86 and the multiple second vertical frames 87 .
In a front case region of the lower cross member 85 in front of the vehicle body, a plurality of vertically elongated batteries 75 are vertically arranged along the plurality of first vertical frames 86 in the longitudinal direction of the vehicle body. In the rear case region of the lower cross member 85 at the rear of the vehicle body, a plurality of vertically long batteries 75 are vertically arranged along the plurality of second vertical frames 87 in the longitudinal direction of the vehicle body. As a result, the plurality of vertically elongated batteries 75 can be vertically arranged efficiently, so that a sufficient cruising distance can be secured.

(battery module)
As shown in FIGS. 3 and 4, a plurality of vertically elongated batteries 75 arranged in the front case area of the lower cross member 85 and a plurality of vertically elongated batteries 75 arranged in the rear case area of the lower cross member 85, for example, drive A battery module 72 for is configured.
That is, the battery module 72 is supported by the plurality of first vertical frames 86 and the plurality of second vertical frames 87 in a state in which the plurality of batteries 75 are vertically arranged with their longitudinal directions directed in the longitudinal direction of the vehicle body.
In the embodiment, an example in which a plurality of batteries 75 on the front side and a plurality of batteries 75 on the rear side are arranged as a pair in the front-rear direction of the vehicle body has been described, but the present invention is not limited to this. As another example, the plurality of batteries 75 on the front side and the plurality of batteries 75 on the rear side may be arranged in three or more rows in the longitudinal direction of the vehicle body.

An upper cross member 88 is arranged above the battery modules 72 and between the plurality of batteries 75 in the front case region and the plurality of batteries 75 in the rear case region, and above the lower cross member 85. there is
The upper cross member 88 is arranged above the lower cross member 85 and extends along the lower cross member 85 in the vehicle width direction. The upper cross member 88 is connected to the upper end of the vertical connection collar 112 with a fastening bolt 113 . The vertical connection collar 112 is coupled to the lower cross member 85 at its lower end. Accordingly, upper cross member 88 is coupled to lower cross member 85 via fastening bolt 113 and vertical coupling collar 112 .

In this state, upper cross member 88 and battery 75 are attached to multiple first vertical frames 86 and multiple second vertical frames 87 with fastening bolts 114 .
Also, the front end portion 72 a of the battery module 72 is attached to the plurality of first vertical frames 86 with fastening bolts 115 . Furthermore, the rear end portions 72b of the battery modules 72 are attached to the plurality of second vertical frames 87 with fastening bolts 116. As shown in FIG.
Thereby, the plurality of vertically elongated batteries 75 (that is, the battery modules 72) are fixed to the plurality of first vertical frames 86 and the plurality of second vertical frames 87. As shown in FIG.

(battery accessory)
Above the plurality of batteries 75 and at the center in the vehicle width direction, an upper deck 89 is provided so as to extend in the longitudinal direction of the vehicle body. The upper deck 89 is provided with a battery auxiliary device 73 such as a high-voltage junction board and an ECU (Electronic Control Unit).
The high-voltage junction box is, for example, an accessory that supplies electricity from the driving battery module 72 to a driving motor (not shown). The ECU is, for example, a battery management unit that controls discharging and charging between the driving battery module 72 and the driving motor.

A case cover 77 is attached to the case frame 81 from above in a state where the battery module 72 and the battery auxiliary device 73 are housed in the case main body 76 . Thereby, the battery pack 20 is assembled and attached to the underfloor of the vehicle Ve.

(1st stay)
As shown in FIGS. 5 to 7 , the first stay 82 protrudes forward from the vehicle body away from the front frame 92 . The first stay 82 has a first stay contour portion (contour portion) 121 , a first partition wall (partition wall) 122 , a second partition wall (partition wall) 123 , and a first stay base 124 .
The first stay base 124 has, for example, a vertical base 125 and a horizontal base 126, and the vertical base 125 and the horizontal base 126 form an L-shaped cross section. The first stay base 124 has a vertical base 125 joined to the front surface portion 92 a of the front frame 92 and a horizontal base 126 joined to the lower surface portion 92 b of the front frame 92 . Thereby, the first stay 82 is joined to the front frame 92 .

The first stay contour portion 121 includes a first stay base end wall 131, a first stay upper wall (the other of upper wall, upper wall and lower wall) 132, and a first stay lower wall (lower wall, upper wall and lower wall). one of the walls) 133 and a first stay tip wall (tip wall, front face) 134 .
The first stay base end wall 131 is formed at a portion of the vertical base 125 of the first stay base 124 between the first stay upper wall 132 and the first stay lower wall 133 . That is, the first stay base end wall 131 is included in the vertical base 125 of the first stay base 124 .
The first stay upper wall 132, for example, horizontally protrudes forward of the vehicle body from a portion near the upper end of the vertical base 125 (that is, the upper end of the first stay base end wall 131). The first stay upper wall 132 is, for example, rectangular in plan view.

The first stay lower wall 133, for example, protrudes forward from the lower end of the vertical base 125 (that is, the lower end of the first stay base end wall 131). The first stay lower wall 133 is, for example, rectangular in plan view. The first stay lower wall 133 has, for example, a lower inclined wall portion 136 and a lower horizontal wall portion 137 .
The lower inclined wall portion 136 is, for example, inclined upward from the lower end portion of the first stay base 124 to the first partition wall 122 toward the front of the vehicle body. The lower horizontal wall portion 137 horizontally protrudes forward of the vehicle body from the tip portion of the lower inclined wall portion 136 to the lower end portion of the tip wall 134 (specifically, a collision wall 145 to be described later).

Since the first stay lower wall 133 has the lower inclined wall portion 136 , the first stay upper wall 132 has a longer overall length in the longitudinal direction of the vehicle body. Also, the lower horizontal wall portion 137 has a bent portion 138 . The bent portion 138 is formed at the intersection of the lower inclined wall portion 136 and the lower horizontal wall portion 137, and is bent to protrude upward (that is, the first stay upper wall 132).

Further, the first partition wall 122 is formed to intersect the first stay upper wall 132 and the first stay lower wall 133 between the first stay upper wall 132 and the first stay lower wall 133 . Specifically, the first partition wall 122 is provided, for example, such that its upper end is perpendicular to the first stay upper wall 132 and its lower end intersects the bent portion 138 of the first stay lower wall 133 . is provided. That is, the first partition 122 is provided at the bent portion 138 .

Further, a second partition wall 123 is provided along the first partition wall 122 between the first stay upper wall 132 and the first stay lower wall 133 and behind the first partition wall 122 in the vehicle body. The second partition wall 123 is formed to intersect the first stay upper wall 132 and the first stay lower wall 133 . Specifically, the second partition wall 123 is provided, for example, so that its upper end portion is perpendicular to the first stay upper wall 132 and its lower end portion is provided so as to intersect the first stay lower wall 133 . .
A first stay tip wall 134 is provided at the tip of the first stay upper wall 132 and the tip of the first stay lower wall 133 . Therefore, the first stay 82 is formed by the first stay base end wall 131, the first stay top wall 132, the first stay bottom wall 133, and the first stay tip wall 134, and the first stay outline portion 121 is formed into a closed cross section. It is

Further, the first stay 82 is formed by a first stay base 124, a first stay upper wall 132, a first stay lower wall 133, a first stay tip wall 134, a first partition 122, and a second partition 123. . The first stay base 124 and the respective walls 132, 133, 134, 122, 123 are formed with a constant thickness in the vehicle width direction. As a result, for example, the first stay 82 can be extruded from an aluminum alloy, and the strength and rigidity in the vertical and longitudinal directions of the first stay 82 can be easily balanced.

In this way, the first stay contoured portion 121 is such that, for example, the entire length of the first stay lower wall 133 is longer than the first stay upper wall 132 in the longitudinal direction of the vehicle body, and the first stay lower wall 133 has a bent portion. 138 are formed. Therefore, the first stay contour portion 121 is deformed outward in the upward direction of the front frame 92 by a load F1 input due to a frontal collision (collision) (hereinafter also referred to as a frontal collision load). formed. Hereinafter, the upper outer side of the front frame 92 may be referred to as a "first upper outer space 141".
A first partition 122 and a second partition 123 are provided inside the first stay contour portion 121 . As a result, the interior of the first stay contour portion 121 is partitioned into a plurality of hollow chambers 142 by the first partition walls 122 and the second partition walls 123 .

Also, the first stay tip wall 134 has, for example, a collision wall 145 and an inclined wall 146 . The collision wall 145, for example, rises vertically upward from the tip of the first stay lower wall 133 (that is, the tip of the lower horizontal wall portion 137). The inclined wall 146 is inclined rearward of the vehicle body, for example, from the upper end of the collision wall 145 to the tip of the first stay upper wall 132 . Therefore, for example, the collision wall 145 can receive the frontal collision load F1 input due to a frontal collision. This collision wall 145 is provided at a position close to the first stay lower wall 133 .

Further, the first stay lower wall 133 has a weak portion (easily deformable portion) 148 between the collision wall 145 and the bent portion 138 . The fragile portion 148 is formed, for example, by an opening such as a through hole through which the fastening bolt 151 can pass from below. Note that the fragile portion 148 is not limited to between the collision wall 145 and the bent portion 138, and may be provided at other locations. Also, the number and shape of the fragile portions 148 can be appropriately selected. Furthermore, the fragile portion 148 is not limited to an opening, and may be formed in other shapes such as a thin thickness.

As shown in FIGS. 3 and 6, the first stay 82 has a length L1 in the longitudinal direction of the vehicle body longer than the height H1 of the front frame 92 in the vertical direction. The length L1 of the first stay 82 in the longitudinal direction of the vehicle body is the distance from the first stay base end wall 131 to the fastening bolt 151 (described later) in the longitudinal direction of the vehicle body. Hereinafter, the length L1 of the first stay 82 in the longitudinal direction of the vehicle body is also referred to as "first stay length L1".
By making the first stay length L1 longer than the height H1 of the front frame 92, the first stay length L1 can be sufficiently long.

Here, the front floor panel 33 is formed with a protruding portion 33c that is one step higher than the front end portion 33b. Therefore, by securing a sufficiently long first stay length L1, the first stay 82 is arranged at the front end portion 33b of the front floor panel 33 in a state where the battery case 71 is housed in the raised portion 33c of the front floor panel 33. can. As a result, when the battery case 71 is housed in the raised portion 33c, it is fastened to the front end portion 33b side of the front floor panel 33 (specifically, the right branch portion 38 and the left branch portion 38 shown in FIG. 2). The bolt 151 can fix the first stay 82 .
Therefore, it is possible to secure both the passenger space (that is, the passenger compartment space) 154 and the battery capacity of the battery module 72 housed in the battery case 71 (that is, the battery capacity of the battery pack 20).

Furthermore, as shown in FIGS. 5 to 7, the first stay 82 is arranged, for example, on the front side of the vehicle body of the first vertical frame 86 and the second vertical frame 87 to 87 are aligned (including generally aligned) on an extension line 149 of 87 .
As a result, the first vertical frame 86 and the second vertical frame 87 support the plurality of batteries 75 , and in particular the first vertical frame 86 can also serve to reinforce the front frame 92 that supports the first stay 82 .

As shown in FIGS. 2 and 6 , the pair of first stays 82 are attached to the right branch portion 38 and the left branch portion 38 from below with fastening bolts 151 . In this state, the first stay 82 is formed deformable so that the collision wall 145 receives the frontal collision load F1 input due to, for example, a frontal collision, and is suitably crushed by the frontal collision load F1. Further, the first stay 82 has strength and rigidity that can support the weight F2 of the battery pack 20, for example.

In the embodiment, in the first stay 82, the entire length of the first stay lower wall 133 is formed longer in the longitudinal direction of the vehicle body than the first stay upper wall 132, and the first stay lower wall 133 has a bent portion 138 and a fragile portion. Although an example in which the portion 148 is formed has been described, the present invention is not limited to this. As another example, for example, the first stay 82 may be formed vertically symmetrically. Specifically, for example, the entire length of the first stay upper wall 132 is formed longer in the longitudinal direction of the vehicle body than the first stay lower wall 133, and the first stay upper wall 132 is formed with a bent portion 138 and a fragile portion 148. may

(Second stay)
As shown in FIGS. 5, 8 and 9, the second stay 83 protrudes rearward of the vehicle body away from the rear frame 93 . The second stay 83 has a second stay contour portion (contour portion) 155 and a second stay base 156 .
The second stay base 156 has a vertical base 157 and a horizontal base 158 . When the vertical base 157 is joined to the rear surface portion 93 a of the rear frame 93 , the upper end portion 157 a protrudes upward from the upper surface portion (upper surface) 93 b of the rear frame 93 . A horizontal base 158 protrudes forward from the vertical base 157 along the upper surface 93b of the rear frame 93 from a portion 157b near the upper end 157a of the vertical base 157 . The horizontal base 158 is joined to the upper surface portion 93b of the rear frame 93, for example.
The second stay 83 is joined to the rear frame 93 by joining the vertical base 157 to the rear surface portion 93 a of the rear frame 93 and joining the horizontal base 158 to the upper surface portion 93 b of the rear frame 93 .

The second stay contour portion 155 includes, for example, a second stay base end wall (at least one of the front wall and the rear wall) 161, a second stay upper wall (upper wall) 162, and a second stay inclined wall (inclined wall) 163 and a second stay tip wall 164 .
The second stay base end wall 161 is formed at a portion of the vertical base 157 of the second stay base 156 between the second stay upper wall 162 and the second stay inclined wall 163 . That is, the second stay base end wall 161 is included in the vertical base 157 of the second stay base 156 .

The second stay upper wall 162 horizontally protrudes forward from the upper end portion 157a of the vertical base 157 (that is, the upper end portion of the second stay proximal end wall 161). Here, the second stay upper wall 162 and the upper end portion 157a of the vertical base 157 are formed in an L shape. As a result, the second stay top wall 162 is displaced (offset) outward above the top surface portion 93b of the rear frame 93 by a height H2.
In addition, the second stay upper wall 162 is formed in a rectangular shape in plan view, and has a thickness (plate thickness) T that is greater than that of the second stay inclined wall 163 .

The second stay inclined wall 163 is supported by the upper surface portion 93b of the rear frame 93 via the lower end portion of the second stay base end wall 161 (that is, the portion 157d near the lower end portion 157c of the vertical base 157). The second stay inclined wall 163 rises from the lower end of the second stay base end wall 161 to the lower end of the second stay tip wall 164 as it separates from the rear surface portion 93a (specifically, the vertical base 157) of the rear frame 93. Slanted to a slope.
The second stay inclined wall 163 is rectangular in plan view and has a weak portion (easily deformable portion) 167 . The fragile portion 167 is formed, for example, by an opening such as a through hole through which the fastening bolt 168 can pass from below.

The second stay tip wall 164 is provided, for example, at the tip of the second stay upper wall 162 and the tip of the second stay inclined wall 163, along the vertical base 125 (that is, the second stay proximal wall 161). are placed. Therefore, the second stay 83 has a triangular (substantially triangular ) is formed in a closed cross-section. Therefore, the strength and rigidity of the second stay 83 can be enhanced.

Also, the second stay 83 is formed by a second stay base 156 , a second stay upper wall 162 , a second stay inclined wall 163 and a second stay tip wall 164 . The second stay base 156 and the respective walls 162, 163, 164 are formed with a constant thickness in the vehicle width direction. As a result, for example, the second stay 83 can be extruded from an aluminum alloy, and the strength and rigidity in the vertical and longitudinal directions of the second stay 83 can be easily balanced.

In this manner, the second stay contour portion 155 is configured such that, for example, the second stay upper wall 162 is displaced (offset) by a height H2 toward the outer side above the upper surface portion 93b of the rear frame 93, and the second stay inclined wall 163 is inclined upward to the lower end of the second stay tip wall 164 .
Therefore, the second stay contour portion 155 is directed outward in the upward direction to the upper surface portion 93b of the rear frame 93 by a load F3 input by a rear collision (collision) (hereinafter sometimes referred to as a rear impact load). formed to deform. Hereinafter, the upper outer side of the upper surface portion 93b of the rear frame 93 may be referred to as a "second upper outer space 166".

In addition, the second stay 83 is arranged, for example, on the rear side of the vehicle body of the first vertical frame 86 and the second vertical frame 87, and is aligned (approximately (including aligned).

As shown in FIGS. 2, 3, and 9, the pair of second stays 83 are configured such that the upper walls 162 of the second stays are attached to the bottom end 102a of the right fixed bracket 102 and the bottom end 102a of the left fixed bracket 102, respectively. It is fixed with fastening bolts 168 .
The right fixed bracket 102 has, for example, an upper end portion 102b attached to the fourth floor cross member 47 (see FIG. 1) from below via the rear floor panel 34. As shown in FIG. The right fixed bracket 102 hangs down from the fourth floor cross member 47 via the rear floor panel 34 . That is, the right second stay 83 of the pair of second stays 83 is attached to the lower end portion 102a of the right fixing bracket 102 suspended from the fourth floor cross member 47 via the rear floor panel 34. is installed.

Further, the left fixed bracket 102 has, for example, an upper end portion 102b attached to the fourth floor cross member 47 (see also FIG. 1) from below via the rear floor panel 34. As shown in FIG. The left fixed bracket 102 hangs down from the fourth floor cross member 47 via the rear floor panel 34 . That is, the left second stay 83 of the pair of second stays 83 is attached to the lower end portion 102a of the left fixing bracket 102 suspended from the fourth floor cross member 47 via the rear floor panel 34. is installed.

In this state, the second stay 83 is deformable so that the second stay tip wall 164 receives a rear impact load F3, which is input due to, for example, a rear collision, and is suitably crushed by the rear impact load F3. Further, the second stay 83 has strength and rigidity to support the weight F2 of the battery pack 20, for example.

In the embodiment, in the second stay 83, the second stay upper wall 162 is displaced above the upper surface portion 93b of the rear frame 93 by the height H2, and the second stay inclined wall 163 is extended to the second stay tip wall 164. Although the example in which it is made to incline upward has been described, the present invention is not limited to this. As another example, for example, the second stay 83 may be formed vertically symmetrically. Specifically, for example, the second stay lower wall may be displaced (offset) below the lower surface of the rear frame 93, and the second stay inclined wall may be inclined downward to the second stay tip wall.

Further, in the embodiment, an example in which the second stay base end wall 161 is provided with the second stay upper wall 162 and the second stay inclined wall 163 has been described, but the present invention is not limited to this. As another example, the second stay upper wall 162 and the second stay inclined wall 163 may be provided on the rear surface portion 93a (at least one of the front wall and the rear wall) of the rear frame 93, for example.

As described above, according to the vehicle-mounted battery pack 20 according to the embodiment, the following effects can be obtained.
First, the first stay 82 will be described.
As shown in FIGS. 6, 10, and 11, the front frame 92 is provided with the first stay 82, and the first stay 82 is provided with the first stay contour portion 121. As shown in FIGS. The first stay contour portion 121 is formed so as to be deformed upward of the front frame 92 by, for example, the front impact load F1. Therefore, for example, when a frontal collision load F1 is input to the first stay 82 due to a frontal collision, the input frontal collision load F1 moves the first stay 82 to the upper outer side of the front frame 92 (that is, the first upper outer space 141). ) can be deformed to bend toward
As a result, for example, when the frontal collision load F1 is input, the first stay 82 can be deformed so as to be favorably crushed while suppressing the residual crushing of the first stay 82 to a small extent. In addition, the first stay 82 can preferably absorb impact energy due to a frontal collision. Therefore, deformation of the battery case 71 can be kept small. As a result, damage to the battery case 71 can be minimized, and the plurality of batteries 75 accommodated in the battery case 71 can be protected from the frontal collision load F1.

Further, for example, when the frontal collision load F1 is input to the first stay 82, the deformation of the first stay 82 can suppress the load input (acting) to the front frame 92 to a small amount. As a result, the front frame 92 does not have to increase the resistance (that is, the strength and rigidity) against the front collision load F1 more than necessary, and the weight of the battery case 71 (that is, the battery pack 20) can be reduced.

In addition, the first stay lower wall 133 has a longer overall length in the longitudinal direction of the vehicle than the first stay upper wall 132 , and the first stay lower wall 133 has a bent portion 138 . Therefore, for example, when the frontal collision load F1 is input to the first stay 82, the frontal collision load F1 can be concentrated on the bent portion 138. As shown in FIG. As a result, the first stay 82 can be bent from the bent portion 138 toward the first upper outer space 141 on the upper outer side of the front frame 92 .
Further, the first partition wall 122 and the second partition wall 123 are perpendicular to the first stay upper wall 132 , and the first stay lower wall 133 is crossed with the first partition wall 122 and the second partition wall 123 . Therefore, bending of the first stay lower wall 133 starting from the bent portion 138 can be transmitted to the first stay upper wall 132 .
Therefore, the first stay 82 can be deformed so as to be preferably bent toward the first upper outer space 141 on the upper outer side of the front frame 92, and the residual crushing of the first stay 82 can be reduced. In addition, the first stay 82 can preferably absorb impact energy due to collision. Therefore, deformation of the battery case 71 can be kept small, and damage to the battery case 71 can be kept small.

Furthermore, the first partition 122 is provided at the bent portion 138 . Therefore, for example, by concentrating the frontal collision load F1 on the bent portion 138 and bending the first stay lower wall 133 with the bent portion 138 as a starting point, the bending deformation of the bent portion 138 is transferred through the first partition wall 122. can be transmitted to the first stay upper wall 132 by the force. As a result, the bending of the first stay lower wall 133 originating from the bent portion 138 can be quickly transmitted to the first stay upper wall 132, and the first stay 82 is deformed so as to be suitably bent. It is possible to suppress the crushed residue of 82 to be small.

A collision wall 145 is formed on the first stay tip wall 134 of the first stay 82 . The collision wall 145 is provided at a position close to the first stay having the bent portion 138 . Therefore, the collision wall 145 receives the frontal collision load F1 input to the first stay 82 , and the frontal collision load F1 received by the collision wall 145 can be quickly concentrated on the bent portion 138 . As a result, the first stay 82 can be deformed so as to be quickly bent, and the residual crushing of the first stay 82 can be reduced.

Furthermore, a fragile portion 148 (see FIG. 7) is formed in the first stay lower wall 133 in which the bent portion 138 is formed. As a result, the bending deformation of the first stay 82 can be increased by deforming the fragile portion 148 with the forward impact load F1 input to the first stay 82 .

Also, as shown in FIGS. 5, 10 and 11, the first stay 82 is aligned on the extension line 149 of the first vertical frame 86 and the second vertical frame 87. As shown in FIG. Therefore, the first vertical frame 86 and the second vertical frame 87 support the plurality of batteries 75 , and in particular the first vertical frame 86 can also serve to reinforce the front frame 92 that supports the first stay 82 . As a result, for example, the frontal collision load F1 input to the first stay 82 can be supported by the first vertical frame 86 and the second vertical frame 87 (particularly, the first vertical frame 86).
Therefore, the first stay 82 can be deformed so as to be suitably bent by the frontal collision load F1, and the residual crushing of the first stay 82 can be reduced. As a result, for example, a reinforcing member (additional member) that reinforces the front frame 92 can be made unnecessary, and the weight of the battery case 71 (that is, the battery pack 20) can be reduced.

Next, the second stay 83 will be explained.
As shown in FIGS. 9, 12, and 13, the rear frame 93 is provided with the second stay 83, and the second stay 83 is provided with the second stay contour portion 155. As shown in FIGS. The second stay contour portion 155 is formed so as to be deformed upward of the rear frame 93 by, for example, a rear surface load F3 input due to a rear collision. Therefore, for example, when a rear impact load F3 is input to the second stay 83 due to a rear-end collision, the input rear impact load F3 moves the second stay 83 into the second upper outer space 166 on the upper outer side of the rear frame 93 . It can be deformed so that it bends towards
As a result, for example, when a rear impact load F3 is input to the second stay 83, the second stay 83 can be deformed so as to be favorably crushed while suppressing the residual collapse of the second stay 83 to a small extent. In addition, the second stay 83 can favorably absorb impact energy due to a rear-end collision. Therefore, deformation of the battery case 71 can be kept small. As a result, damage to the battery case 71 (see FIG. 3) can be minimized, and the plurality of batteries 75 (see FIG. 3) accommodated in the battery case 71 can be protected from the front collision load F3.

Furthermore, for example, when a rear collision load F3 is input to the second stay 83, the deformation of the second stay 83 can reduce the load input (act) to the rear frame 93. FIG. As a result, the rear frame 93 does not have to increase the resistance (that is, the strength and rigidity) against the rear collision load F3 more than necessary, and the weight of the battery case 71 (that is, the battery pack 20) can be reduced.

Further, the second stay upper wall 162 of the second stay 83 is displaced (offset) upward and outward from the upper surface portion 93b of the rear frame 93 . Therefore, for example, when a rear impact load F3 is input to the second stay 83 due to a rear collision, the input rear impact load F3 can deform the second stay upper wall 162 so as to bend upward.
Further, the second stay inclined wall 163 is inclined upward as it moves away from the rear frame 93 toward the rear of the vehicle body. Therefore, when the rear impact load F2 is input to the second stay 83, part of the input rear impact load F3 can be converted into an upward load F4 by the second stay inclined wall 163. FIG. Therefore, the second stay 83 can be bent upward by the load F4. In addition, the second stay inclined wall 163 is formed with a weakened portion 167 (see FIG. 9). As a result, the second stay 83 can be deformed so as to be favorably crushed while suppressing the remaining portion of the second stay 83 from being crushed.
Therefore, the second stay 83 preferably absorbs the impact energy due to the rear-end collision, and the deformation of the battery case 71 (see FIG. 3) can be kept small. As a result, damage to the battery case 71 can be minimized, and the battery 75 (see FIG. 3) can be protected from the rear impact load F3.

Further, as shown in FIGS. 2, 3, and 9, the second stay profile is formed by the second stay base end wall 161, the second stay top wall 162, the second stay inclined wall 163, and the second stay tip wall 164. A portion 155 is formed to have a substantially triangular (including triangular) closed cross section. Therefore, the strength and rigidity of the second stay 83 are enhanced.
Here, for example, the second stay upper wall 162 of the pair of second stays 83 is attached to the rear floor panel 34 (specifically, the fourth floor cross member 47 (more specifically, the fourth floor cross member 47 ( 1), that is, fixed to the vehicle body 10). In this state, the heavy battery pack 20 can be supported by the pair of second stays 83 (in particular, the second stay inclined walls 163) with increased strength and rigidity.

Furthermore, the thickness T of the second stay upper wall 162 is made larger than that of the second stay inclined wall 163 . As a result, for example, surface rigidity (rigidity) against a vertical load F5 applied from above to the second stay upper wall 162 by the self weight F2 of the battery pack 20 can be ensured.
Further, for example, a fixing bracket 102 is attached to the second stay upper wall 162, and the fixing bracket 102 is fixed to the rear floor panel 34 (specifically, the fourth floor cross member 47 (see FIG. 1)). . In this state, the second stay inclined wall 163 can support the second stay upper wall 162 in a loose manner. Therefore, the rigidity of the second stay 83 in the vertical direction can be ensured by the second stay inclined wall 163 .
In this manner, the surface rigidity of the second stay upper wall 162 is ensured, and the vertical rigidity of the second stay 83 is ensured by the second stay inclined wall 163, so that the battery pack 20, which is a heavy object, can be It can be supported by two stays 83 .

In addition, the second stay upper wall 162 is attached to the fixed bracket 102 suspended from the rear floor panel 34 (specifically, the fourth floor cross member 47 (see FIG. 1)). Therefore, for example, the second stay 83 can be arranged at a position protruding from the rear end portion 33a of the front floor panel 33 toward the rear of the vehicle body. Thereby, the battery case 71 can be made large up to the rear end portion 33a of the front floor panel 33, and the battery capacity of the battery module 72 housed in the battery case 71 (that is, the battery capacity of the battery pack 20) can be increased.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, in the above-described embodiment, a pair of first stays 82 are provided on the front frame 92 and a pair of second stays 83 are provided on the rear frame 93, but the present invention is not limited to this. As another example, for example, only one of the front frame 92 and the rear frame 93 may be provided with a stay.
Also, the number of first stays 82 provided on the front frame 92 and the number of second stays 83 provided on the rear frame 93 may be appropriately selected.

Furthermore, in the above-described embodiment, an example in which the first stay 82 is provided on the front frame 92 and the second stay 83 is provided on the rear frame 93 has been described, but the present invention is not limited to this. As another example, for example, the first stay 82 may be provided on the rear frame 93 and the second stay 83 may be provided on the front frame 92 .

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

Ve vehicle 10 vehicle body (body)
20 battery pack (vehicle-mounted battery pack)
23 floor panel 33 front floor panel 34 rear floor panel 71 battery case (battery case)
72 battery module 75 battery 81 case frame (frame)
82 First Stay (Stay)
83 Second Stay (Stay)
86 first vertical frame (vertical frame)
87 second vertical frame (vertical frame)
92 front frame (front wall)
93 rear frame (rear wall)
93a Rear surface portion of rear frame (at least one portion of front wall and rear wall)
93b Upper surface of rear frame (upper surface)
94 right frame (right wall)
95 left frame (left wall)
102 Fixed bracket 121 First stay outline (outline)
122 first partition (partition)
123 second partition (partition)
132 1st stay top wall (top wall, other of top wall and bottom wall)
133 1st stay lower wall (lower wall, one of upper wall and lower wall)
134 1st stay tip wall (tip wall, front)
138 Bending portion 142 Hollow chamber 145 Collision wall 148 Weak portion 149 Extension line 155 Second stay contour portion (contour portion)
161 second stay base end wall (at least one of front wall and rear wall)
162 2nd stay upper wall (upper wall)
163 2nd stay inclined wall (inclined wall)
F1 Front collision load (load)
F3 rear impact load

Claims (10)

Equipped with a battery case that is mounted under the floor of the vehicle and stores multiple batteries,
The battery case is
a frame formed by a front wall, a rear wall, left and right side walls, and having the battery disposed therein;
a stay provided on at least one of the front wall and the rear wall and protruding in a direction away from at least one of the front wall and the rear wall in the longitudinal direction of the vehicle body;
The stay is
having a contour portion that deforms outward in the vertical direction with respect to at least one of the front wall and the rear wall;
A vehicle-mounted battery pack characterized by: The stay is
an upper wall that is displaced upward and outward from the upper surface of at least one of the front wall and the rear wall;
an inclined wall that is supported by at least one of the front wall and the rear wall and that inclines upwardly as it moves away from at least one of the front wall and the rear wall in the longitudinal direction of the vehicle body;
The outline portion forms a triangular closed cross-section by at least one portion of the upper wall, the inclined wall, and the front wall and the rear wall,
The vehicle-mounted battery pack according to claim 1, characterized in that: the top wall is thicker than the angled wall;
3. The vehicle-mounted battery pack according to claim 2, wherein: The battery case is
arranged below the front floor panel of the floor panels forming the floor of the vehicle,
The stay is
The upper wall is attached to a fixed bracket suspended from a rear floor panel adjacent to the rear of the vehicle body of the front floor panel,
The vehicle-mounted battery pack according to claim 3, characterized in that: The stay is
an upper wall and a lower wall forming the contoured portion; and a partition provided between the upper wall and the lower wall;
one of the upper wall and the lower wall is longer than the other in the longitudinal direction of the vehicle body, and one of the walls has a bent portion;
The partition is formed to intersect the upper wall and the lower wall, and the interior of the contoured portion is partitioned into a plurality of hollow chambers by the partition.
The vehicle-mounted battery pack according to claim 1, characterized in that: The partition is provided at the bent portion,
The vehicle-mounted battery pack according to claim 5, characterized in that: The stay has a collision wall that is provided on the tip wall and receives a load due to collision,
The collision wall is provided at a position close to one of the upper wall and the lower wall having the bent portion,
7. The vehicle-mounted battery pack according to claim 5, wherein: The stay has a weakened portion on one of the upper wall having the bent portion and the lower wall,
The vehicle-mounted battery pack according to any one of claims 5 to 7, characterized in that: The stay is set longer in the longitudinal direction of the vehicle body than the vertical height of at least one of the front wall and the rear wall.
The vehicle-mounted battery pack according to any one of claims 1 to 8, characterized in that: a vertical frame extending in the longitudinal direction of the vehicle body from the battery case and supporting the battery;
The stays are aligned on an extension line of the vertical frame,
The vehicle-mounted battery pack according to any one of claims 1 to 9, characterized in that:

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