JPH06333543A - Storage battery - Google Patents

Abstract

PURPOSE:To reduce the generation of distortion even though a container is of the form liable to generate distortion to the increase of the internal pressure, by making the form of the container in a square-shaped plate form, and making the form in the plane view approaching to a triangle. CONSTITUTION:A storage battery 10 has a package 11 and an electrode 12, and the package 11 is formed in a flat triangle pole form, while its side surface is opened. As a result, it is made in a triangle in the plane view when it is observed from the upper side. And, from the side surface where the package 11 is opened, the electrode 12 with almost a similar form with the package 11, and with the size housed in the inside space of the package 11 is housed. By making the container of the storage battery 10 in a square-shaped plate form, the housing efficiency is made excellent, and by approaching the form in the plane view, the rigidity of the container is increased. And even though a gas is generated at the inside, the structure is made tough to the internal pressure. Consequently, since the strength of the storage battery can be increased corresponding to the large size and the large capacity of the storage battery, it can bear sufficiently against the increase of the internal pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved storage battery.

[0002]

2. Description of the Related Art Conventionally, a storage battery of this type is constructed as shown in FIG. In the figure, a storage battery 1 is configured by accommodating an electrode 3 in a flat rectangular container 2 having a space inside. Such a flat plate type storage battery 1 is also referred to as a gum battery, and is suitably used for various home electric appliances, large electric vehicles and the like.

[0003]

By the way, in such a storage battery 1, due to its structure, gas is generated inside and the internal pressure is likely to increase. In particular, at high temperatures, gas is likely to be generated and there is a risk of destruction. In particular, as the internal pressure P increases due to the generation of gas or the like, the mechanical strain on the long side at the center of the container becomes considerably large as shown by the dotted line in FIG.

In this respect, when the container is formed in a cylindrical shape, it is structurally strong, can cope with such an increase in internal pressure, and is excellent in sealing property. However, the cylindrical storage battery has a drawback that it is unsuitable for use in storage batteries for electric vehicles, which is expected in the future, in view of poor space efficiency, because the storage battery takes up space. .

The present invention has been made in order to solve the above problems. For example, even if it is a rectangular flat plate type having a shape that is apt to be distorted in response to an increase in internal pressure, the distortion is less likely to occur. The purpose is to provide a storage battery that can be.

[0006]

According to the present invention, the above object is to provide a storage battery constructed by housing electrodes in a container, wherein the container has a rectangular flat plate shape, and has a triangular shape in a plan view. This is achieved by a storage battery that is formed close to one another.

The container is preferably in the shape of a rectangular flat plate, and has a substantially isosceles triangle in plan view.

The container may be formed in a rectangular flat plate shape so as to have a substantially right triangle in a plan view.

[0009]

According to the above construction, since the storage battery container of the present invention is in the shape of a rectangular flat plate, the storage efficiency is excellent. Moreover, by making the shape in plan view approach a triangle, the rigidity of the container is increased, and even if gas is generated inside, the structure is tough against internal pressure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 is a perspective view showing a preferred embodiment of the storage battery of the present invention. In the figure, a storage battery 10 includes a package 11 and an electrode 12. In this example,
The package 11 is formed in a flat triangular prism shape, and its side surface is open. Therefore, when viewed from above, that is, a plan view triangle.

From the open side surface of the package 11, as shown in FIG. 1, an electrode 12 having a shape similar to that of the package and having a size to be accommodated in the internal space of the package 11 is accommodated. Then, as shown in FIG. 2, if necessary, a sealing material is applied to the open side surface to cover the lid 1
Close with 3. The lid member 13 may be welded to the package 11. At this time, the conduction of heat to the electrode 12 by welding is performed at 120 ° C. to 130 ° C.
Try to keep it at C.

FIGS. 3 and 4 show another example of the storage battery package of this embodiment. In the figure, the storage battery 1
0 includes a package 14 and an electrode 12. In this embodiment, the package 14 is formed in the shape of a flat triangular prism, and therefore is common to that of FIGS. 1 and 2 in that it is a triangle when viewed from above, that is, a plan view.

The surface of the package 14 is open, and the package 14 has a shape similar to the package 14 through the opening as shown in FIG.
The electrode 12 having a size that can be accommodated in the internal space of

Then, as shown in FIG. 4, the opening is
It is closed by the sealing material 15 and fixed by welding or tightening the bolts 16, 16.

When the storage battery having such a structure is used at a high temperature, a gas such as hydrogen gas is generated inside. Due to the generation of this gas, the inside of the packages 11 and 12 is
The internal pressure as described in 1 is generated. Therefore, the long sides of these packages 11 and 12 tend to bulge outward.

In this respect, the conventional storage batteries 1 may be destroyed if they are stacked and used, or if they are used in a place where space is not available, for example, in the trunk of an electric vehicle. Specifically, if the maximum deflection at the center of the package 2 exceeds a certain amount, not only can it not be practically used, but in the worst case, the seal may be broken and the gas may leak to the outside. There is.

Here, FIG. 5 shows an example of the deflection amount of the package 2 when the internal pressure is generated by the internal gas in the conventional storage battery 1 in which the package 2 has a quadrangular shape in plan view by the present inventors. Is numerically analyzed, and the points where the deflection amounts match are connected by contour lines. In the case of the conventional storage battery 1, the amount of deflection is largest near the center of the package 2, and the value at this time is set to 10.

On the other hand, FIG. 6 shows the results of the inventors of the present invention measuring the change in the amount of deflection due to internal pressure when the package 11 is formed into a regular triangle in plan view. In the case of the storage battery 10 of this embodiment, the amount of deflection is 8 in the vicinity of the central portion where the internal pressure is highest, and when compared with the conventional storage battery 1,
The amount of deflection is 20% less.

Next, FIG. 7 shows a modification of the storage battery of this embodiment. In the figure, the storage battery 20 has a package 20 in the shape of a right-angled triangle in a plan view as illustrated.

When the package 20 has such a shape, the amount of deflection is 6 in the vicinity of the central portion where the internal pressure is highest as compared with the conventional case. Therefore, in comparison with the conventional storage battery 1, the maximum value of the amount of deflection is 4
It can be seen that the reduction is about 0%.

As described above, in the storage battery of this embodiment, since the rigidity of the package can be increased, it is easy to increase the size of the rectangular flat plate type storage battery and to reduce the thickness of the package plate. Further, as a structure for strengthening the structure of the package, a pillar may be provided in this package, but as compared with such a technique, according to this embodiment, the manufacturing process of the conventional storage battery is hardly changed. Can be implemented, which is advantageous.

FIG. 8 shows an example of the arrangement of the storage battery 20 of this embodiment. Compared with the conventional quadrangular package in plan view, the storage battery of the present embodiment has a different shape and requires some storage. However, by making the shape of the package closer to a triangle, and by making the hypotenuses of the package face each other, as shown in this figure, the storage capacity is substantially the same as that of conventional storage batteries.

FIG. 9 is a plan view showing another example of the shape of the storage battery package of this embodiment. As shown in FIG. 9 (A), the package 31 has chamfered R-shaped vertices of a triangle in its planar shape. Also,
A part of the hypotenuse is deformed (bent), and even if it is configured in this way, there is no great difference in the rigidity of the package, and the effect is almost the same as that of each of the above-described embodiments.

Further, as shown in FIG. 9 (B), the package 41 basically has a triangular planar shape, but is chamfered so as to cut off two opposite vertices, and strictly speaking, it has a pentagonal shape. ing. However, even with such a package shape, its rigidity is improved as compared with the conventional rectangular shape. Therefore, the container “formed so that the shape in plan view approaches a triangle” in the present invention includes a container formed by cutting off a part of the apex of the triangle.

The present invention is not limited to the above embodiment. By providing columns in the package together with the package shape described above, a tougher structure can be obtained.

[0027]

As described above, according to the present invention, the strength of the storage battery can be increased in response to the increase in size and the increase in capacity of the storage battery, and the increase in internal pressure can be sufficiently endured. Further, for example, even when used in a limited space such as an electric vehicle, a prismatic storage battery can be adopted, so that space efficiency can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a preferred embodiment of a storage battery of the present invention.

FIG. 2 is a side view showing a part of the storage battery of FIG.

FIG. 3 is an exploded perspective view showing another example of the preferred embodiment of the storage battery of the present invention.

FIG. 4 is a side view of the storage battery of FIG. 3 having a partially cutaway portion.

FIG. 5 is a diagram showing how internal pressure is applied in a conventional storage battery by numerically analyzing the amount of deflection of the container.

FIG. 6 is a diagram showing how internal pressure is applied in a storage battery according to an embodiment of the present invention by numerically analyzing the amount of deflection of the container.

FIG. 7 is a diagram showing how internal pressure is applied in a storage battery having a container having a shape different from that of FIG. 6 by numerically analyzing the amount of flexure of the container.

FIG. 8 is a view showing an arrangement example when the storage battery of FIG. 7 is used.

FIG. 9 is a diagram showing an example of processing of a storage battery package according to an embodiment of the present invention.

FIG. 10 is an exploded perspective view showing the structure of a conventional storage battery.

FIG. 11 is an explanatory view showing a model of how internal pressure is applied in a conventional storage battery.

[Explanation of symbols]

 10 Storage Battery 11 Container (Package) 12 Electrode 13 Lid Material

Claims (3)

[Claims] 1. A storage battery constructed by housing an electrode in a container, wherein the container has a rectangular flat plate shape and is formed so as to approach a triangular shape in a plan view. 2. The storage battery according to claim 1, wherein the container is in the shape of a rectangular flat plate and has a substantially isosceles triangular shape in a plan view. 3. The storage battery according to claim 1, wherein the container is in the shape of a rectangular flat plate and has a substantially right triangle in a plan view.