JPH0747892A - Mounting mechanism of cylindrical battery for electric automobile - Google Patents

Abstract

PURPOSE:To provide a mounting mechanism for mounting a battery on a car body, as a unit battery, the cylindrical battery used as a power supply for an electric automobile of electric motor-driven four-wheeled vehicle, three- wheeled vehicle, etc. CONSTITUTION:By a pair of plates 2, 2 consisting of material of high thermal conductivity in light weight and closely adhering to about a half-peripheral surface of a cylindrical battery 1 to form one or a plurality of circular arc groove-shaped battery holding parts 5, one or a plurality of the cylindrical batteries 1 are held to be interposed from both the outsides, and ventilating paths 6 are formed between a pair of the plates 2, 2. The cylindrical batteries 1 thus interposed are connected in series to form a power supply unit for an electric automobile. The plate 2 is mounted on a body of the electric automobile. Thus by holding the cylindrical batteries interposed by the plates 2 excellent in thermal conductivity, heat generation of the cylindrical battery, when in use, can be efficiently processed, to improve efficiency of workability and a degree of freedom for mounting the cylindrical battery to the electric automobile.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular battery for an electric vehicle, which is implemented to mount a tubular battery used as a power source for an electric vehicle such as an electric four-wheeled vehicle or an electric three-wheeled vehicle on a vehicle body as an assembled battery. Related to the mounting mechanism.

[0002]

2. Description of the Related Art A conventional electric vehicle uses a storage battery (lead battery) of DC 24V to 300V as its power source, which is very heavy and has been a bottleneck in improving the performance of the electric vehicle. On the other hand, tubular batteries typified by NiCad batteries are lightweight and therefore advantageous for application to electric vehicles, but since the nominal voltage is a few volts, they can be used as a power source for electric vehicles by combining multiple batteries. Is generally used.

Conventionally, the combination mode of the assembled battery is shown in FIG. 4A.
As illustrated in FIG. 4C, a battery pack (FIG. 4A) in which four cylindrical batteries 1 are closely adhered in parallel and directly connected by lead wires 11 and fastened with a tape 10 (FIG. 4A), or inside a tube exterior 12 made of a resin film In general, a battery pack (FIG. 4B) containing four cylindrical batteries 1 or a battery pack (FIG. 4C) housed in a plastic case 13 was used. And this assembled battery was simply mounted on the body of an electric vehicle.

[0004]

Power source batteries for electric vehicles are often used with high current discharge, and efficient heat dissipation processing of heat generated by the internal resistance of the batteries has become a serious problem. In particular, as a power supply battery for an electric vehicle, a nickel-cadmium battery, which is excellent because it is lightweight, is also disadvantageous in that it generates a large amount of heat. In addition, the conventional mounting mechanism using the assembled battery shown in FIGS. 4A to 4C cannot sufficiently cope with the above heat generation.

Further, in the case of a cylindrical battery, it is necessary to combine the cylindrical battery with the assembled battery before mounting the battery. Therefore, not only the time and effort required for the combination increase but the number of parts to be mounted increases, and the degree of freedom of mounting is also lost. The reality is that Accordingly, an object of the present invention is to provide a tubular battery mounting mechanism for an electric vehicle, which can efficiently dissipate heat generated when the tubular battery is used and has a degree of freedom in mounting on an electric vehicle. .

[0006]

As a means for solving the above-mentioned problems, a mounting mechanism of a tubular battery for an electric vehicle according to the present invention is made of a material which is lightweight and has high thermal conductivity. Holding one or a plurality of cylindrical batteries 1 from both outsides by a pair of plates 2 and 2 formed with one or a plurality of battery holding portions 5 in an arc groove that are in close contact with about half the circumferential surface of An air passage 6 is formed between the pair of plates 2 and 2, and the tubular battery 1 sandwiched as described above is connected in series to form a power supply unit of an electric vehicle. Each is characterized by being attached to the body of an electric vehicle.

The present invention also relates to the plate 2,
At least a portion excluding the surface that is in close contact with the cylindrical battery 1 or a portion of the ventilation path 6 between the pair of plates 2 and 2 is provided with a heat-radiating uneven portion, and the cylindrical battery 1 has a circular cross section. And that the plate 2 is attached to the vehicle body of the electric vehicle through the vibration isolator 4.

[0008]

When the tubular battery 1 generates heat due to its use, the plate 2 having a high thermal conductivity which is in close contact with the outer peripheral surface of the tubular battery 1
Heat is absorbed by the battery holding portion 5 and is radiated to the atmosphere through the plate 2. The air passage 6 exerts a cooling effect by taking in natural convection and running wind of the automobile. Plate 2
Is attached to the vehicle body of an automobile by means of screwing 3 or the like, so that the cylindrical battery 1 as an assembled battery can be mounted.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state in which a plurality of cylindrical batteries 1 are mounted in an electric vehicle in the form of an assembled battery. The outer peripheral surface of the cylindrical battery 1 is sandwiched by a pair of plates 2 and 2, and is fixed by screws 3 to the body of an electric vehicle (not shown). The plate 2 is made of, for example, an aluminum plate that is lightweight and has a high thermal conductivity, and is provided with a plurality of battery holding portions 5 formed in a semicircular groove shape that are in close contact with the semicircular surface of the cylindrical battery 1. Also, a pair of plates 2, 2
A gap between both plates, which occurs when the cylindrical battery 1 is sandwiched, is formed as a ventilation passage 6 for cooling. Therefore,
The plate 2 has not only a holding function of holding the tubular battery 1 but also a heat sink function of effectively absorbing and radiating heat generated from the tubular battery 1. In particular, the battery holding part 5
Directly adheres to the outer peripheral surface of the cylindrical battery 1, so that the heat absorbing action is effective. In addition, since the cylindrical battery 1 is strongly adhered to the plate 2 by tightening the screw 3, the cylindrical battery 1
Adhesion between the plate and the plate 2 can be sufficiently ensured. further,
By appropriately increasing the thickness of the plate 2, the heat sink function corresponding to the heat generation amount of the tubular battery 1 can be sufficiently enhanced. The ventilation passage 6 can be used not only for cooling by natural convection of air but also for actively and effectively cooling the plate 2 and the cylindrical battery 1 by taking in traveling wind during normal traveling of the automobile. In order to further enhance the heat dissipation effect, as shown in FIG. 2, fins 7 are provided on the outer surface of the plate 2 and inside the air passage 6, or heat dissipation such as a bent portion 8 that enlarges the cross-sectional area of the air passage 6 is performed. An uneven part can also be used.

Further, as shown in FIGS. 3A and 3B, the processed shape or the whole shape of the plate 2 is formed into an arbitrary shape so as to correspond to the number of the cylindrical batteries 1 to be mounted and the limitation of the mounting space. it can. Further, as the processing method of the plate 2, it is possible to adopt an economical processing means most suitable for each shape such as bending processing or extrusion processing as well as casting processing.

The tubular battery 1 is, for example, a nicad battery having a circular cross section. A commercially available product having a diameter of 45 mm and a length of about 150 mm, which is advantageous in terms of cost, is used. The cylindrical battery 1 is not limited to the nickel-cadmium battery, and various conventional cylindrical batteries can be adopted. Further, the cross section of the cylindrical battery 1 is not limited to a circular shape, and other squares or the like can be adopted, but the circular shape is particularly excellent in terms of manufacturing cost.

A vibration-proof rubber 4 which is a vibration-proof material is attached to the outer surface of the plate 2, which is not shown in the figure, to be mounted on the vehicle body of an automobile so that harmful vibration is transmitted from the vehicle body side to the cylindrical battery 1 as much as possible. Prevention is done. Further, as the means for attaching the plate 2 to the vehicle body, not only the direct attachment method using the screw 3 described above but also the one-touch type attachment can be performed by using an intermediate plate or the like for male / female fitting, so that the attachment is free. It is also preferable to increase the degree.

[0013]

EFFECTS OF THE INVENTION Since the tubular battery mounting mechanism for an electric vehicle according to the present invention holds the tubular battery between the plates 2 having excellent thermal conductivity, the tubular battery can efficiently generate heat during use. Not only can it be processed, but the workability of mounting the cylindrical battery in an electric vehicle can be improved and the degree of freedom can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a tubular battery is sandwiched.

FIG. 2 is a cross-sectional view of a plate with improved heat dissipation effect.

FIG. 3 is a cross-sectional view of plates processed into different shapes.

4A to 4C are perspective views showing a state in which a conventional tubular battery is assembled.

[Explanation of symbols]

 1 Cylindrical battery 2 Plate 6 Ventilation path 4 Anti-vibration material

Claims (2)

[Claims] 1. A pair of plates, which are made of a material which is lightweight and has a high thermal conductivity, and which has one or a plurality of arc-groove-shaped battery holding portions which are in close contact with about a half circumferential surface of a cylindrical battery. The cylindrical battery is sandwiched from both outsides, an air passage is formed between the pair of plates, and the cylindrical batteries sandwiched as described above are connected in series to form a power supply unit of an electric vehicle. A tubular battery mounting mechanism for an electric vehicle, characterized in that it is formed and the plate is attached to a vehicle body of the electric vehicle. 2. The plate according to claim 1, wherein a heat-dissipating concave-convex portion is provided in a portion excluding a surface in close contact with the cylindrical battery or in a ventilation passage portion between the pair of plates, and the cylindrical battery. Is a circular cross-section, and the plate is attached to the body of the electric vehicle via a vibration isolator, respectively.