JP2001113959A - Vehicle battery mounting structure - Google Patents

Abstract

(57) [Problem] To provide a vehicle battery mounting structure capable of effectively absorbing an impact load and protecting the battery when an impact load is applied from the rear of a vehicle body. SOLUTION: A battery mount 20, which is provided on a floor at a rear portion of a vehicle body and on which a battery box for storing a battery is mounted, is mounted on a battery mounting portion 21 for supporting the battery box 10, a front leg portion 22, and a rear leg portion 23. And the front leg 22 and the rear leg 23 are
Form vulnerable to 1. When an impact load is applied from the rear of the vehicle body, the fragile front legs 22 and rear legs 23 are deformed, and the rigidity of the floor 2 due to the battery mount 20 is suppressed, and the crash stroke of the floor 2 is suppressed. Is maintained, the deformation of the battery mounting portion 21 is avoided, and damage to the battery box 10, the battery, and the like is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a battery for a vehicle, and more particularly to a structure for mounting a battery in a vehicle having a battery mounted on a rear portion of a vehicle body.

[0002]

2. Description of the Related Art A vehicle such as an electric vehicle or a so-called hybrid vehicle which is driven by using an engine and an electric motor for traveling together has a large-scale battery or a large number of batteries for supplying electric power to the electric motor. Is mounted. Such a battery is stored in a general battery case and mounted under the floor of a vehicle.

However, when a battery case is arranged under the floor, a highly waterproof structure is required because it is necessary to effectively prevent water intrusion even in a bad environment such as splashing of water from a road surface or landing of a vehicle. Need to be applied. In addition, since the battery is heavy and exposed to the outside, various reinforcing members need to have high rigidity, and the battery case and the road surface interfere with each other, particularly when traveling on a rough road, and the battery case is damaged. Therefore, the battery case itself needs to have high rigidity.

For this reason, when the battery case is arranged under the floor, there is a concern that the battery case, the reinforcing structure, and the like become large, which causes an increase in vehicle weight and an increase in manufacturing cost.

As a countermeasure against this, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent No. 5746 and shown in a cross-sectional view of a main part in FIG. 5, an iron plate is formed on a rear surface of a backrest 102 provided on a rear seat 101 disposed at a rear portion of a vehicle compartment 100 of an electric vehicle. Case front 111,
Stay 10 on floor 104 in trunk room 103
6 has a battery case 110 formed by bolting a case rear 112 made of a resin material and fixed to the case rear 112 by attaching a mounting leg Ba formed at a lower portion of a side surface of the battery B disposed in the battery case 110 to the case rear 112. A battery mounting structure that is bolted to the stay 106 via a bolt hole at the bottom of the battery has been proposed.

[0006]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 10-25 / 1998
According to Japanese Patent No. 5746, the battery case 110 is disposed at the front of the trunk room 103 behind the passenger compartment 100, so that when an impact load is applied from the front or rear of the vehicle body, the battery case 110 is directly impacted. Since no load is applied, the impact load affecting the battery case 110 can be reduced, and the battery case 110 is not exposed outside the vehicle body.
10 is not flooded and the battery case 11
Interference between 0 and the road surface can be avoided. As a result, the reinforcement structure and the waterproof structure of the battery case can be simplified, and the battery case can be downsized and the manufacturing cost can be reduced.

However, in a relatively small vehicle having a limited space in the trunk room, it is difficult to sufficiently secure a crash stroke against an impact load from the rear of the vehicle body, and effective battery protection is achieved. It may not be done.

Also, by providing a trunk space behind the rear seats in the passenger compartment, a so-called two-box type vehicle having no independent trunk room can similarly have a sufficient crash stroke when an impact load acts on the rear portion of the vehicle body from behind. Is difficult to secure.

[0009] Further, there is a concern that the useful capacity of the trunk room or trunk space is greatly reduced due to the battery case, and the convenience is reduced.

Accordingly, a first object of the present invention in view of the above point is that when an impact load is applied from behind the vehicle body,
It is an object of the present invention to provide a vehicle battery mounting structure capable of effectively absorbing an impact load and protecting the battery by securing a sufficient crash stroke.

A second object of the present invention is to provide a vehicle battery mounting structure capable of securing an effective capacity of a trunk room or a trunk space and protecting the battery effectively.

[0012]

According to a first aspect of the present invention, there is provided a vehicle battery mounting structure for accommodating a battery on a battery mount provided on a floor at a rear portion of a vehicle body. In the vehicle battery mounting structure in which the box is mounted, the battery mount is provided with a battery mount supporting the battery box, and a battery mount mounted between the front of the battery mount and the floor. A front leg supporting the front part, and a rear leg installed between the rear part of the battery mounting part and the floor to support the rear part of the battery mounting part, wherein the front leg part and the rear leg are provided. The part is characterized by being formed vulnerable to the battery mount.

According to the first aspect of the present invention, an increase in the rigidity of the floor due to the battery mount is suppressed by the deformation of the front leg and the rear leg of the battery mount which is relatively weak. As a result, when a predetermined or more impact load is applied from the rear of the vehicle body to the rear portion of the vehicle body, the floor is crushed and deformed, and the crash stroke is secured, sufficient shock absorption is obtained, and safety is secured. In addition, the firmly formed battery mounting portion is prevented from being deformed, so that the battery box supported by the battery mounting portion is prevented from being deformed, and the battery and the like stored in the battery box are prevented from being damaged.

According to a second aspect of the present invention, in the vehicle battery mounting structure according to the first aspect, the battery mounting portion includes a front frame and a rear frame extending in a vehicle width direction and arranged in parallel with each other. A pair of side frames extending in the front-rear direction and connecting the respective side ends of the front frame and the rear frame, and a connection frame provided between the intermediate portions of the front frame and the rear frame. Ladder-shaped frame structure.

According to the second aspect of the present invention, the battery mounting portion is formed in a substantially rectangular shape by the front frame, the rear frame, and both side frames, and the ladder is formed by connecting the front frame and the rear frame by the connection frame. Since it is formed in the frame structure, a light weight and a battery mounting portion having sufficient rigidity are secured. In addition, by forming the front frame, the rear frame, the both side frames, and the like, in particular, into a light-weight, highly rigid cross-section having a substantially rectangular shape, a lighter and more rigid battery mounting portion is secured.

According to a third aspect of the present invention, in the vehicle battery mounting structure according to the first or second aspect, the front leg includes a leg body having an upper end coupled to a front portion of the battery mounting portion. A base bracket connected to the lower end of the leg main body and a mounting bracket connected to the floor are provided with a plate-shaped mounting bracket continuously formed through a bent portion.

According to the third aspect of the present invention, the lower end portion of the leg main body, the upper end of which is connected to the battery mounting portion, is connected to the floor via the plate-shaped mounting bracket which is bent through the bent portion. The fragile portion can be formed on the front leg by a simple structure.

According to a fourth aspect of the present invention, in the vehicle battery mounting structure according to the first to third aspects, the rear leg portion includes:
A base portion connected to a rear portion of the battery mounting portion and a mounting surface connected to the floor are plate-shaped continuously formed with a bent portion.

According to the fourth aspect of the present invention, a relatively fragile rear leg can be easily formed by a simple plate-like structure which is bent through the bent portion and has a base and a mounting surface. .

According to a fifth aspect of the present invention, in the vehicle battery mounting structure according to the first to fourth aspects, the front leg portion includes:
A door stopper is provided opposite to an inner surface of a lower portion of the side door and restricts entry of the side door into the vehicle interior.

According to the fifth aspect of the present invention, since the door stopper is formed on the front leg, when a predetermined or more impact load is applied from the outside of the side door, that is, from the side of the vehicle body, the side door is moved to the door stopper. To prevent the side door from entering the cabin, thereby ensuring the safety of the cabin, protecting the battery box and the battery box from the intrusion of the side door, and damaging the battery box and the batteries in the battery box. Is avoided.

According to a sixth aspect of the present invention, in the vehicle battery mounting structure according to the first to fifth aspects, the battery box and the battery mount are arranged between the floor and the rear seat. I do.

According to the sixth aspect of the present invention, since the battery box and the battery mount are disposed below the rear seat, the effective capacity of the trunk space or the trunk room disposed on the floor behind the rear seat is secured. The second object can be achieved, and the portion can effectively function as a crash stroke.

According to a seventh aspect of the present invention, in the vehicle battery mounting structure according to the sixth aspect, the rear seat is disposed above the battery box and supports a substantially rectangular seat cushion frame; A pair of front legs provided between the front end corners of the seat cushion frame and the floor in front of and outside the battery box and the battery mount, and a seat behind and outside the battery box and the battery mount. A seat support having a pair of rear legs provided between each rear corner of the cushion frame and the floor is provided.

According to the seventh aspect of the present invention, the battery box and the battery mount are surrounded by the seat cushion frame of the seat support, the pair of front legs and the pair of rear legs, and the floor to which the battery mount is attached. Is stiffened, the battery mount, the battery box, the battery stored in the battery box, and the like are protected against external forces from above, in the front-rear direction, and from the side.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle battery mounting structure according to the present invention will be described below with reference to FIGS. 1 to 4 taking a two-box type vehicle as an example. The arrow F indicates the forward direction of the vehicle body.

FIG. 1 is a side view of a main portion of a rear portion of a vehicle body showing an outline of the present embodiment, FIG. 2 is a perspective view of a main portion showing a mounting structure of a battery box, and FIG. 3 shows an outline of a mounting structure of a rear seat. It is an exploded perspective view.

Reference numeral 1 in the figure denotes a rear portion of the body of an electric vehicle or a hybrid vehicle driven by using both an engine and an electric motor.

The floor 2 of the rear portion 1 of the vehicle body has a low floor portion 2a,
A step portion 2b inclined continuously behind the low floor portion 2a and a high floor portion 2c formed behind the step portion 2b are continuously formed.

A battery mount 20 on which the battery box 10 is mounted is bridged between the low floor 2a of the floor 2 and the front of the high floor 2c, and a rear seat 30 is disposed so as to cover the upper part of the battery box 10. A trunk space 5 is formed behind the rear seat 30.

As shown in FIGS. 1 and 2, the battery box 10 has a substantially rectangular bottom portion 11a and a bottom portion 1 made of resin.
Front wall 11b and rear wall 11 erected along the outer periphery of 1a
c, formed by a box-shaped box body 11 composed of the peripheral walls of both side walls 11d and 11e and having an open top, and a sheet metal cover 12 that closes the top of the box body 11 that is open. A plurality of batteries (not shown) for supplying electric power for driving to the motor are stored. The lower ends of both side walls 11d and 11e of the box body 11 are connected to a battery mount 2 described later.
0 so as to cover the side of the battery mounting portion 21
It is formed to be lower than 1a.

The battery mount 20 for supporting the battery box 10 has a rectangular battery mounting portion 21 substantially following the planar shape of the bottom surface portion 11 of the battery box 10, and a front portion of the battery mounting portion 21 formed on a low floor of the floor 2. A pair of front legs 22 attached to and supported by the portion 2a and a pair of rear legs 2 attached to and supported by the rear of the battery mounting portion 21 at the front of the raised floor portion 2c.
3 and a rear leg 24.

The battery mounting portion 21 has a front frame 21a and a rear frame 21b having a substantially rectangular cross section which extend in the vehicle width direction and are arranged in parallel with each other, and a front frame 21a and a rear frame which extend in the front-rear direction. A pair of side frames 21c and 21d formed in a substantially rectangular cross section for connecting the respective side ends of the respective 21b to each other is formed in a substantially rectangular shape, and further extends between the front frame 21a and the intermediate portion between the rear frames 21b in the front-back direction. A plate-shaped connecting frame 21e is provided.

The front legs 22 are respectively connected near the front ends of the side frames 21c and 21d. Each front leg 2
2 is a support leg 2 having a rectangular cross section, whose upper end is respectively connected to the side frames 21c and 21d and is inclined downward to the side of the vehicle body.
A substantially L-shaped leg main body 22a which is coupled to the lower end of the support leg 22b and extends outward and is mounted on the low floor 2a and having a rectangular cross section; A base is connected to the front surface of the support portion 22c, and a mounting surface continuously formed forward at a lower end of the base through a bent portion extending in the width direction overlaps with the low floor portion 2a to overlap the low floor portion 2a. And a plate-shaped mounting bracket 22d bent in a substantially L shape and bolted to the mounting bracket 22d.

Further, a side door 6 provided on a side surface of the rear portion 1 of the vehicle body is provided at an upper surface side end of the support portion 22c of the front leg portion 22.
When an impact load is applied to the side door 6 from the outside facing the lower inner surface of the door 6, that is, the lower inner surface of the inner panel of the door 6, the door comes into contact with the side door 6 to prevent the side door 6 from entering the cabin. A door stopper 22e for preventing intrusion is provided upright.

The rear leg 23 has a base 23a connected to each rear end of the rear frame 21b and a mounting surface 2a.
Reference numeral 3b denotes a plate member bent into a substantially L shape and bolted onto the front portion of the raised floor portion 2c. On the other hand, when the base 24a is connected to the center of the rear surface of the rear frame 21b, the rear leg 24 is bent into a substantially L-shape in which the branched mounting surfaces 24b are respectively bolted to the front center of the high floor 2c. It is formed by the plate member.

The battery mount 20 thus formed
The battery mounting portion 21 is formed in a substantially rectangular shape by a rigid front frame 21a, a rear frame 21b, and side frames 21c and 21d having a substantially rectangular cross section, and the front frame 21a and the rear frame 21b are connected to each other by a connecting frame 2.
1e, it is formed by a so-called ladder-like frame structure, so that it is lightweight and has sufficient rigidity strength, while the lower end of the front leg 22 is bent substantially in an L-shape. The low floor portion 22a is relatively vulnerable to the load in the front-rear direction by the mounting bracket 22d having a simple structure
And the rear frame 21b and the raised floor 2
The rear legs 23 and 24 connecting the c are formed relatively fragile by a simple structure having a substantially L-shape.

As shown in FIGS. 1 and 3, the rear seat 30 is located above the battery box 10 and covers the upper side of the battery box 10 through a gap.
2a, rear frame 32b, both side frames 32c, 3
2d, a substantially rectangular seat cushion frame 32 composed of a central frame 32e connecting the central portions of the front frame 32a and the rear frame 32b, and extending downward at the front end corner of the seat cushion frame 32 to bend downward. The lower end is located in front of the battery mounting section 20 and outward in the width direction and the low floor section 2a
And a pair of front legs 33 bolted to the raised floor portion 2c extending from the rear end corner of the seat cushion frame 32 and having a lower end behind the battery mount 20 and outward in the width direction. It has a highly rigid seat support portion 31 integrally formed with the rear leg portion 34.

By the seat cushion frame 32 of the seat support portion 31 and the pair of front leg portions 33 and the pair of rear leg portions 34 extending from the seat cushion frame 32, the battery box 10 and the battery mounting portion 20 are formed.
Are surrounded and protected, and the area of the floor 2 to which the battery mount 20 is attached is stiffened.

A seat cushion 35 is placed on a seat cushion frame 32 of the seat support portion 31, and a backrest 37 is bolted to a rear portion of the seat cushion frame 32 via a seat bracket 36.

Next, the operation of the vehicle battery mounting structure thus configured will be described with reference to the operation explanatory diagram shown in FIG.

The battery box 10 and the battery mount 20 are surrounded and protected as if by the seat cushion frame 32 of the seat support portion 31 and the pair of front leg portions 33 and the pair of rear leg portions 34 extended from the seat cushion frame 32. In addition, since the area of the floor 2 to which the battery mount 20 is attached is stiffened, the battery box 1 is protected against external forces from above, front and rear, and side.
0 and the battery stored in the battery box 10 are protected, and the battery box 10 is accommodated below the rear seat 30, so that the effective capacity of the trunk space 5 formed on the high floor 2c is ensured. .

On the other hand, since the components constituting the rear suspension, which can generally withstand vibration and impact during traveling, are strong and have high rigidity, in the normal state shown in FIG. When an impact load P greater than a predetermined value acts on the rear portion, the rear portion of the vehicle body is deformed and the rear wheel is pushed forward, for example, so that the vehicle body frame on which the rear suspension is mounted rises, and is shown in FIG. As described above, the high floor portion 2c forming the trunk space 5 of the floor 2 is crushed and deformed, and at the same time, the front portion of the high floor portion 2c that mounts and supports the rear legs 23 and 24 of the battery mount 20 is pushed up.

As the front portion of the raised floor portion 2c is pushed up, the bent portions of the relatively weak rear legs 23 and 24 are deformed, and the front leg 22 is bent. When the mounting bracket 22d bends and deforms,
An increase in the rigidity of the floor 2 due to the attachment of the battery mount 20 is suppressed, and the raised and crushed deformation of the high floor portion 2c is allowed, and a crash stroke is secured. As a result, impact absorption due to sufficient crushing deformation is ensured, and the impact is alleviated, thereby ensuring safety.

Also, the firmly formed battery mounting portion 2
Since the battery 1 is prevented from being deformed, the battery box 10 supported by the battery mounting portion 21 is prevented from being deformed, and the battery stored in the battery box 10 is prevented from being damaged.

Further, the door enters the lower leg of the side door 6 provided on the side surface of the rear portion 1 of the vehicle body, that is, the lower inner surface of the inner panel of the door 6, at the upper end of the support portion 22c of the front leg portion 22. Since the door stopper 22e for prevention is formed, the side door 6 is received by the door stopper 22e when an impact load of a predetermined amount or more is applied from the outside of the side door 6, in other words, from the side of the vehicle body. Intrusion into the cabin is prevented to ensure the safety of the cabin, and the battery box 10 and the battery box 10 are protected from the intrusion of the side door 6.
And avoid damage to the battery and the like.

The present invention is not limited to the above embodiment, but can be variously modified without departing from the spirit of the invention. For example, in the above embodiment, the front leg 22
Mounting bracket 22d and rear legs 23 and 24
Although the front leg portion 22 and the rear leg portions 23 and 24 are formed fragile as compared with the battery mounting portion 10 by being formed in the shape of a letter, the front leg portion 22 and the rear leg portions 23 and 24 are formed in front of the battery mounting portion 10 by appropriate means such as changing the sectional shape. Leg 22 and rear leg 23,2
4 can be made vulnerable.

The shapes of the front frame 21a, the rear frame 21b, the side frames 21c, 21d, and the connecting frame 21e of the battery mounting portion 21 are changed according to the shape of the battery box 10 and the required strength of the battery mount 20.
Alternatively, the connecting frame 21e can be increased or omitted, and the rear leg 24 can be omitted or the shapes of the front leg 22 and the rear leg 23, 24 can be changed as appropriate.

Furthermore, in the above embodiment, a so-called two-box type vehicle having a trunk space at the rear of the vehicle compartment has been described. However, the present invention may be applied to a vehicle having a trunk room independent of the vehicle compartment. it can.

[0050]

According to the vehicle battery mounting structure of the present invention described above, the battery mount for mounting the battery box, which is disposed on the floor at the rear part of the vehicle body and stores the battery, is mounted on the battery mount supporting the battery box. A mounting part, a front leg supporting the front part of the battery mounting part, and a rear leg supporting the rear part of the battery mounting part are formed, and the front leg and the rear leg are vulnerable to the battery mount. Therefore, when an impact load equal to or more than a predetermined value is applied to the vehicle body from the rear of the vehicle body, the front leg and the rear leg are deformed, thereby suppressing an increase in the rigidity of the floor due to the battery mount, and as a result, While deformation of the floor is allowed and a crash stroke is ensured, sufficient shock absorption is obtained and safety is ensured, while a firmly formed battery mounting part is deformed. Avoidance has been damaged, such as a battery, which is stored in the supported battery box and battery box to the battery mounting portion is avoided.

Further, by disposing the battery box and the battery mount below the rear seat, the effective capacity of the trunk space or the trunk room disposed on the floor behind the rear seat is ensured, and at the same time the crash stroke is prevented. Can effectively function as

Further, the seat support portion of the rear seat is disposed above the battery box, and the seat cushion frame is disposed between the front end corner of the seat cushion frame and the floor in front of and outside the battery box and the battery mount. And a pair of rear legs provided between the respective rear end corners of the seat cushion frame and the floor behind and outside the battery box and the battery mount. By the upper,
The battery mount, the battery box, the battery stored in the battery box, and the like are protected against external forces from the front-rear direction and from the side.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a rear portion of a vehicle body, showing an outline of an embodiment of a mounting structure of a vehicle battery box according to the present invention.

FIG. 2 is an exploded perspective view showing an outline of a mounting structure of a battery box.

FIG. 3 is an exploded perspective view showing an outline of a mounting structure of a rear seat.

4A and 4B are explanatory diagrams of the operation, in which FIG. 4A schematically shows a normal state before the impact load is applied, and FIG. 4B is a diagram schematically illustrating a deformed state of the rear portion of the vehicle body due to the impact load. It is.

FIG. 5 is a sectional view of a main part showing a conventional battery mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body rear part 2 Floor 5 Trunk space 6 Side door 10 Battery box 11 Box body 12 Cover 20 Battery mount 21 Battery mounting part 21a Front frame 21b Rear frame 21c Side frame 21d Side frame 21e Connection frame 22 Front leg 22a Leg body 22d Mounting bracket 22e Door stopper 23 Rear leg 23a Base 23b Mounting surface 24 Rear leg 24a Base 24b Mounting surface 30 Rear seat 31 Seat support 32 Seat cushion frame 31 Seat support 33 Front leg 34 Rear leg 35 Seat Cushion P Impact load

Claims (7)

[Claims] 1. A vehicle battery mounting structure in which a battery box for storing a battery is mounted on a battery mount disposed on a floor at a rear portion of a vehicle body, wherein the battery mount includes a battery mount supporting the battery box. A front leg that is installed between the front of the battery mounting unit and the floor and supports the front of the battery mounting unit; and a front leg that is installed between the rear of the battery mounting unit and the floor. And a rear leg supporting a rear portion of the battery mounting portion, wherein the front leg and the rear leg are formed fragile with respect to the battery mount. 2. A front frame and a rear frame extending in the vehicle width direction and arranged in parallel with each other, and each side end of the front frame and the rear frame extending in the front-rear direction. 2. The vehicle according to claim 1, wherein the vehicle has a ladder-like frame structure including a pair of side frames connecting the front frame and a connection frame provided between the intermediate portions of the front frame and the rear frame. 3. Battery mounting structure. 3. The front leg includes a leg main body having an upper end coupled to a front part of the battery mounting part, a base coupled to a lower end of the leg main body, and a mounting surface coupled to the floor. The mounting structure for a vehicle battery according to claim 1 or 2, further comprising: a plate-shaped mounting bracket formed continuously through a bent portion. 4. The rear leg has a plate shape in which a base portion connected to a rear portion of the battery mounting portion and a mounting surface connected to the floor are continuously formed via a bent portion. A mounting structure for a vehicle battery according to claim 1. 5. The vehicle according to claim 1, wherein the front leg portion includes a door stopper disposed opposite to an inner surface of a lower portion of the side door to restrict entry of the side door into the vehicle interior. The mounting structure of the vehicle battery described in the above. 6. The vehicle battery mounting structure according to claim 1, wherein the battery box and the battery mount are disposed between the floor and a rear seat. 7. A substantially rectangular seat cushion frame disposed above the battery box to support a seat cushion; and a front end of each of the seat cushion frames in front of and outside the width of the battery box and the battery mount. A pair of front legs installed between the corners and the floor, and a pair of front legs installed between the rear end corners of the seat cushion frame and the floor behind and outside the battery box and the battery mount. The vehicle battery mounting structure according to claim 6, further comprising a seat support having a rear leg.