JPH0995145A - Battery mounting structure for electric vehicles - Google Patents

Abstract

(57) Abstract: In a battery mounting structure for an electric vehicle, the battery is efficiently mounted on a vehicle body to reduce the weight and facilitate maintenance. SOLUTION: The left and right vertical joists 20 are fixed on the chassis frame 12 of the vehicle along the front-rear direction, and between the longitudinal joists 20 and between the chassis frame 12 and the packing box 19, a battery box storage portion. 21 is formed, and the battery box 18 accommodating the battery 15 can be accommodated in the battery box accommodating portion 21 by the slide mechanism 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery mounting structure for an electric vehicle that runs by driving an electric motor using electric power generated by a generator having a prime mover or electric power stored in a battery.

[0002]

2. Description of the Related Art In recent years, it has been desired to put into practical use, for example, a hybrid electric vehicle that suppresses the generation of exhaust gas due to the problem of the global environment. Especially, delivery work is performed in a city where environmental problems are severe. Application to trucks is desired. This hybrid electric vehicle is a prime mover and a generator,
A battery, an electric motor, etc. are installed, and the electric power stored in the battery or the electric power generated by the generator when the prime mover is driven is selectively used, and the electric motor is driven by this electric power, and the electric motor is driven. The vehicle is driven by rotating drive wheels that are drivingly connected to the output shaft.

FIG. 7 is a graph showing changes in the battery charge rate with respect to the mileage of a general hybrid electric vehicle. As shown in the graph of FIG. 7, before starting the traveling of the electric vehicle, the battery charging rate is 100% by preliminarily storing electric power in the battery by a charger or the like. From this state, the electric motor is driven by the electric power stored in the battery to start traveling of the electric vehicle. Then, the battery charge rate decreases as the travel distance increases, and when the battery charge rate decreases to, for example, 50%, the prime mover is driven to start power generation by the generator. When power generation is started in this manner, the generated power is supplied to the electric motor of the electric vehicle and also stored in the battery. Then, when the battery charge rate rises to 55%, the driving of the prime mover is stopped, the power generation by the generator is stopped, and the electric motor is driven only by the electric power of the battery to drive the electric vehicle. Further, when the prime mover is a gasoline engine, the electric vehicle continues to run by refueling in the middle. Furthermore, by setting the charging rate of the battery to 100% by using a charger or the like, it becomes possible to run quietly without driving the prime mover at night.

By thus preliminarily storing the electric power in the battery by the charger or the like to set the charging rate to 100%, the electric motor is driven by the electric power of the battery without driving the prime mover so that the electric vehicle runs quietly. While the
When the battery charge rate drops to a predetermined value, the prime mover can be driven to store the electric power generated by the generator in the battery, and the electric motor can be driven to drive the electric vehicle. In this case, if the prime mover is a gasoline engine, by driving this engine at a constant speed,
Exhaust gas characteristics are improved.

In the hybrid electric vehicle described above, it is necessary to mount a required amount of batteries on the vehicle body, and a truck must be equipped with a large number of batteries. FIG. 8 shows an outline of a truck showing a battery mounting structure of a conventional electric vehicle.

As shown in FIG. 8, an electric motor 102 is arranged in the center of the vehicle body frame 101.
The propeller shaft 103 connected to the output shaft of the is extended rearward and is drive-connected to the left and right drive wheels 105 via the differential 104. A large number of batteries 106 for supplying electric power to the electric motor 102 are mounted on the vehicle body frame 1.
It is attached to the outside of 01. That is, the body frame 10
A mounting bracket 107 is fixed to the outer side surface of the battery 1 by bolts (not shown), and a large number of batteries 106 are mounted on the mounting bracket 107.

A conventional battery mounting structure for a truck is disclosed in Japanese Utility Model Laid-Open No. 6-12149. The battery mounting structure disclosed in this publication allows a plurality of batteries to be placed on a pallet, and the pallet can be stored and held in an engaging portion formed by a cross member integrated with the vehicle body.

[0008]

In the battery mounting structure of the conventional truck shown in FIG. 8 described above, a large number of batteries 106 are mounted on both sides of the body frame 101, and the balance of the entire vehicle is not good. . Further, the large number of batteries 106 are attached to the outer surface of the vehicle body frame 101 via the attachment brackets 107, and the attachment state is cantilevered so that the supporting rigidity is low. However, there is a problem that the weight of the vehicle body increases. Further, since the electric motor 102 and the battery 106 are arranged apart from each other, the electric cable to be connected becomes long, the battery 106 is difficult to see, and the attachment / detachment is troublesome.
There are problems such as poor maintainability.

Further, in the battery mounting structure disclosed in Japanese Utility Model Laid-Open No. 6-12149, a plurality of batteries can be placed on a pallet so that they can be stored and held in an engaging portion of a vehicle body. Although the maintainability of the battery is improved, the pallet on which the plurality of batteries are mounted is mounted on the side part of the vehicle body, and like the above, the balance of the entire vehicle is not good, and ,
Since the supporting rigidity of the large number of batteries is insufficient, there is a problem that the mounting parts become large and heavy.

The present invention solves such a problem, and an object of the present invention is to provide a battery mounting structure for an electric vehicle that efficiently mounts a battery on a vehicle body to reduce the weight and has good maintainability. .

[0011]

SUMMARY OF THE INVENTION To achieve the above object, a battery mounting structure for an electric vehicle according to the present invention is mounted on a chassis frame of a vehicle so as to extend along the front-rear direction and to provide a load box. A battery box storage part is formed between the supporting left and right vertical joists and between the chassis frame and the luggage box, and the battery box storing the battery is stored in the battery box storage part. It is what

Therefore, the battery box in which the battery is housed is housed in the battery box housing formed in the dead space between the chassis frame and the luggage box and between the left and right vertical joists, such as the chassis frame. The battery can be mounted efficiently without significant refurbishment and with a good weight balance.

Further, in the battery mounting structure of the electric vehicle of the present invention, the battery box housing is formed so as to open toward the rear of the vehicle, and the battery box can be pulled out from the opening along the longitudinal direction of the vehicle. It is characterized in that a slide mechanism for slidably supporting it is provided.

Therefore, the battery box can be slid along the vehicle front-rear direction by the slide mechanism, the battery box can be easily pulled out from the rear opening, and the maintenance of the battery can be facilitated.

Further, in the battery mounting structure of the electric vehicle of the present invention, the slide mechanism has a pair of rails which are provided on opposite inner side surfaces of the left and right vertical joists and slidably support the battery box. It is characterized by.

Therefore, it becomes possible to easily attach the slide mechanism for slidably supporting the battery box using the left and right vertical joists.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings and examples.

FIG. 1 is a schematic configuration of a truck showing a battery mounting structure of an electric vehicle according to an embodiment of the present invention, FIG. 2 is a side view of a battery box and its storage portion showing the battery mounting structure of the present embodiment, and FIG. 2 is a plan view of the battery box and its housing, FIG. 4 is a sectional view taken along line IV-IV of FIG. 2, and FIG.
6 is a V-V cross section, and FIG. 6 shows an outline for explaining a sliding state of the battery box.

In the battery mounting structure for an electric vehicle of this embodiment, as shown in FIG. 1, an engine 13 as a prime mover mounted on a chassis frame 12 of a vehicle 11 is an internal combustion engine (LPG or methanol) that uses gasoline as fuel. It may be an engine), and the generator 14 is drivingly connected to the output shaft of the engine 13. This engine 13
The generator 14 and the generator 14 constitute a power generation system of a hybrid electric vehicle. The generator 14 is electrically connected to a battery 15 that stores the generated power and a motor 16 as an electric motor. A drive wheel 17 is connected to the output shaft of the motor 16.

In this embodiment, a large number of batteries 15
The battery box 18 can be housed in the battery box 18, and the battery box 18 is mounted on the chassis frame 12 in the front-rear direction to support the luggage box 19. The battery box 18 can be stored in the portion 21 (see FIGS. 4 and 5), and is slidable by a slide mechanism 22 so that the battery box 18 can be pulled out toward the rear of the vehicle.

As shown in FIGS. 2 to 5, a pair of left and right vertical joists 20 are mounted on both sides of the chassis frame 12 in the form of a frame so as to extend in the front-rear direction.
The vertical joist 20 has a U-shaped cross section and is arranged so that its openings face each other, and is fixed to the chassis frame 12 by a large number of fixing bolts 31. The first rails 32 each having a horizontal support surface are fixed to the inner surfaces of the pair of right and left vertical joists 20 that face each other, and the first rails 32 are provided at the rear end in the longitudinal direction (the right end in FIGS. 2 and 3). 1
Each roller 33 is attached by a bracket 34.

On the other hand, the battery box 18 capable of accommodating a large number of batteries 15 has a box shape with an open upper side, and the battery box 1 is opposed to the inner surfaces of the pair of left and right vertical joists 20.
The left and right side surfaces of the second rail 3 have horizontal support surfaces.
5 are fixed respectively, and the front end in the longitudinal direction (see FIG.
Also, the second roller 36 is attached to the left end portion in FIG. 3 by a bracket 37, respectively.

Therefore, each second roller 36 of the battery box 18 is rollable on each of the first rails 32 of the left and right vertical joists 20, and each second rail 35 is vertical joists 20.
Is movably supported on the first roller 33, and the battery box 18 is moved in the longitudinal direction of the vertical joist 20 by the slide mechanism 22 including the rails 32 and 35 and the rollers 33 and 36, that is, the vehicle front-rear direction. It is free to move along.

The first rail 32 of the vertical joist 20 has a step 32a at the front end thereof, while the battery box 1
The second rail 35 of No. 8 has a step portion 35a at the rear end. As described above, the left and right vertical joists 20 form the battery box storage portion 21 above the chassis frame 12, and the battery box storage portion 21 is opened rearward of the vehicle.

Therefore, when this battery box 18 is moved forward of the vehicle by the slide mechanism 22 to the front end of the battery box storage portion 21, it rolls on the first rail 32 of the vertical joist 20 as shown in FIG. The second roller 36 of the battery box 18 falls off the step portion 32a, and the second rail 35 of the battery box 18 moving on the first roller 33 of the vertical joist 20 falls off by the step portion 35a. At this time, the first rail 32 of the vertical joist 20
The second rail 35 of the battery box 18 with respect to the upper surface of the
When the lower surfaces of the battery boxes 18 come into close contact with each other, the battery boxes 18 are restrained by the vertical joists 20 due to mutual frictional resistance.

In the battery box 18 in which a large number of batteries 15 are housed in this way, the second rail 35 is in close contact with the first rail 32 in the battery box housing portion 21, and the frictional resistance generated by the total weight of the plurality of batteries 15 is generated. Thus, it is possible to surely restrain and position and store.

On the other hand, as shown in FIG. 6, from the state where the battery box 18 is stored in the battery box storage portion 21, the second roller 36 of the battery box 18 is moved to the stepped portion 3.
After pulling up the second rail 35 from the 2a onto the first rail 32 of the vertical joist 20 and pulling up the second rail 35 from the step portion 35a onto the first roller 33, the battery box 18 is moved to the rear of the vehicle by the slide mechanism 22, The battery box 18 can be taken out of the vehicle by pulling it out toward the rear of the vehicle from the rear opening of the box storage portion 21.

Thus, the battery box 18 accommodating a large number of batteries 15 can be easily pulled out to the vehicle rear side from the rear opening of the battery box accommodating portion 21 by the slide mechanism 22 and taken out from the vehicle.
Can be efficiently maintained.

[0029]

As described above with reference to the embodiments, according to the battery mounting structure of the electric vehicle of the present invention, the left and right vertical members which are mounted on the chassis frame of the vehicle so as to extend along the front-rear direction. Since the battery box storage portion is formed between the joists and between the chassis frame and the packing box, and the battery box in which the battery is stored is stored in the battery box storage portion, the battery box is stored in the vehicle. It can be stored in the battery box storage part formed using the dead space, and a large number of batteries can be efficiently stored without significantly improving the chassis frame.
Also, it can be mounted in a good weight balance,
In addition, the connection of the batteries can be facilitated, the weight of the supporting member of the battery can be reduced, and the maintenance of the battery can be easily performed.

Further, according to the battery mounting structure of the electric vehicle of the present invention, the battery box housing portion is formed so as to be opened rearward of the vehicle, and the battery box can be slid along the vehicle longitudinal direction so that the battery box can be pulled out from the opening. Since the slide mechanism that freely supports is provided, the battery box can be slid along the vehicle front-rear direction by the slide mechanism and can be easily pulled out from the rear opening, and the battery can be easily maintained.

Further, according to the battery mounting structure of the electric vehicle of the present invention, since the slide mechanism has the pair of rails slidably supported on the inner side surfaces of the left and right vertical joists, which slidably support the battery box, It is possible to easily attach the slide mechanism that slidably supports the box by using the left and right vertical joists, and it is possible to reduce the number of attachment steps and the attachment cost without significantly improving the chassis frame and the like.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a truck showing a battery mounting structure of an electric vehicle according to an embodiment of the present invention.

FIG. 2 is a side view of a battery box and a storage portion thereof showing the battery mounting structure of the present embodiment.

FIG. 3 is a plan view of a battery box and a storage portion thereof.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a schematic diagram for explaining a sliding state of the battery box.

FIG. 7 is a graph showing changes in a battery charging rate with respect to a mileage of a general hybrid electric vehicle.

FIG. 8 is a schematic view of a truck showing a battery mounting structure of a conventional electric vehicle.

[Explanation of symbols]

 11 vehicle 12 chassis frame 13 engine 14 generator 15 battery 16 electric motor 18 battery box 20 vertical joist 21 battery box storage 22 slide mechanism 32 first rail 32a step 33 first roller 35 second rail 35a step 36 second roller

Claims (3)

[Claims] 1. A left and right vertical joists mounted on a chassis frame of a vehicle so as to extend along the front-rear direction to support a luggage box, and between the chassis frame and the luggage box. A battery mounting structure for an electric vehicle, characterized in that a battery box housing portion is formed, and a battery box housing a battery is housed in the battery box housing portion. 2. The battery mounting structure for an electric vehicle according to claim 1, wherein the battery box housing portion is formed to be open toward the rear of the vehicle, and the battery box can be pulled out from the opening in the vehicle longitudinal direction. A battery mounting structure for an electric vehicle, characterized in that a slide mechanism for slidably supporting the battery is provided. 3. The battery mounting structure for an electric vehicle according to claim 2, wherein the slide mechanism includes a pair of rails that are provided on opposite inner side surfaces of the left and right vertical joists and slidably support the battery box. A battery mounting structure for an electric vehicle characterized by having.