JPH0888019A - Sealed storage battery - Google Patents

Abstract

PURPOSE: To reduce cost of a sealed storage battery by integrating electrodes with the same structure by fitting to batteries with different shape. CONSTITUTION: A negative electrode material 3, a separator 4, a positive electrode activated material 5, and a positive current collector 6 are stacked in order around a linear negative current collector 2, and the negative electrode material 3, the separator 4, and the positive active material 5 are impregnated with an electrolyte to constitute an electrode 1. Flexibility is given to the electrode 1 and the electrode 1 is integrated by fitting to the shape of a battery container.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed storage battery, and more particularly to a sealed storage battery in which the same electrodes can be integrated according to the shape of the battery.

[0002]

2. Description of the Related Art In conventional sealed storage batteries, the shape of electrodes and the method of integration have been determined according to the shape of the battery. For example, in a cylindrical battery, electrodes are integrated in a roll shape,
In the prismatic battery, the electrodes were laminated in a plate shape.

[0003]

However, according to the conventional sealed type storage battery as described above, since the electrode shape and the integration method are different depending on the battery shape, different production equipments are required according to each type. There was a problem that it became a factor of high cost. There is also a drawback that the space between the electrodes is easily influenced by the integration method. That is, in the case of a cylindrical battery, the space between the electrodes is changed by the tension of winding the electrodes in a roll shape, and in the case of a prismatic battery, the space between the electrodes is changed by the surface pressure when the electrode plates are stacked and bundled. Change.

The present invention has been made in view of the above circumstances, and provides a low-cost sealed storage battery having a simple structure, which can be integrated according to batteries having different shapes by using electrodes having the same structure. The purpose is to provide.

[0005]

In order to achieve the above object, the sealed storage battery according to claim 1 has a negative electrode material 3 and an insulating material (for example, as shown in FIG. 4), the positive electrode active material 5 and the positive electrode current collector 6 are sequentially laminated and coated, and the negative electrode material 3, the separator 4 and the positive electrode active material 5 are provided with an electrode 1 which is impregnated with an electrolytic solution. Characterize.

The sealed storage battery according to claim 2 has an electrode 1
It is characterized in that the end face of is sealed with the sealing material 7.

[0007]

In the sealed type storage battery having the structure of the first aspect, the electrode 1 is composed of the linear negative electrode current collector 2 as a center, and the layers 3, 4,
Since 5 and 6 are laminated concentrically, flexibility can be provided by reducing the diameter of the wire.
Therefore, by winding or folding the electrode 1, the electrodes 1 can be integrated according to the shape of the battery. Also, the electrode 1
Is linearly formed integrally with each other, so that there is almost no space between the layers and is constant.

In the sealed storage battery having the structure of the second aspect, since the end surface of the electrode 1 is sealed by the sealing material 7, the leaching of the electrolytic solution impregnated into the electrode 1 and the negative electrode material 3 and It is possible to prevent the positive electrode active material 5 from falling off. Moreover, since the electrode 1 is impregnated with the electrolytic solution, the structure of the battery container can be simplified.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the sealed storage battery of the present invention will be described below with reference to the drawings.

1 to 3 show the structure of an electrode 1 according to an embodiment of the present invention. In FIG. 1 and FIG. 2, the outer periphery of the negative electrode current collector 2 made of copper in a thin wire shape is covered with the negative electrode material 3 made of carbon, and both ends of the negative electrode current collector 2 are made of the negative electrode material 3. It projects from the end face. The outer circumference of the negative electrode material 3 is
The separator 4 is covered with a separator 4 made of polypropylene having electrical insulation, and the outer periphery of the separator 4 is covered with a positive electrode active material 5 made of lithium cobalt oxide. Further, the outer periphery of the positive electrode active material 5 is covered with a positive electrode current collector 6 formed of an aluminum thin film. That is, the electrode 1 has a multilayer structure with the negative electrode current collector 2 as a core.

The electrolytic solution is impregnated into the negative electrode material 3, the separator 4 and the positive electrode active material 4 from the end face of the electrode 1. After impregnation with the electrolytic solution, as shown in FIG. 3, the end surface of the electrode 1 is sealed with a sealing material 7 to prevent the active material from falling off and the electrolytic solution from leaching out.

FIG. 4 shows a state in which the electrode 1 constructed as described above is housed in a battery container. In the example shown in FIG. 4 (a), the electrodes 1 are axially integrated in a coil in a cylindrical battery container 11. The electrode 1 is concentrically wound from the upper part to the lower part along the inner circumference of the battery container 11, and is folded and wound from the lower part to the upper part. Then, both ends of the electrode 1 are drawn out above the battery container 11.

In the example shown in FIG. 4B, the electrodes 1 are spirally integrated in a coin-shaped battery container 21, and both ends of the electrode 1 are drawn out from the upper surface of the battery container 21.

The example shown in FIG. 4 (c) is a prismatic battery container 3
The electrodes 1 are alternately folded and integrated in the inside 1. In addition, the example shown in FIG. 4D is a cylindrical battery container 4
In one, a plurality of electrodes 1 are integrated in parallel in the axial direction to have a multi-core structure.

According to this embodiment, the electrode 1 is connected to the negative electrode current collector 2
The core is made into a multi-layer structure, and the diameter is reduced to give flexibility, so that the electrode 1 can be wound in a coil,
It can be folded, and the electrode 1
It can be integrated according to the shapes of 1, 21, 31, and 41. Further, by sealing the end surface of the electrode 1 with the sealing material 7, it is possible to prevent the active material from falling off and the electrolytic solution from leaching out, and it is possible to reduce the occurrence of short circuit defects.
Furthermore, since the electrode 1 can be impregnated with the electrolytic solution for sealing, the structure of the battery container can be simplified.

The materials forming the respective parts of the electrode 1 of the above embodiment are examples, and the materials are not limited to these.

[0017]

As described above, according to the sealed type storage battery of the first aspect, since each part constituting the electrode has the linear multi-layer structure with the negative electrode current collector as the core, flexibility is improved. It can be held and can be integrated according to the shape of the battery container. As a result, batteries having different shapes can be formed using the same electrode.

According to the sealed type storage battery of claim 2,
Since the end faces of the electrodes are sealed with the sealing material, it is possible to prevent the active material from falling off and the electrolyte from seeping out, and it is possible to reduce the occurrence of short-circuit defects. Moreover, the structure of the battery container can be simplified.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a configuration of an electrode provided in an embodiment of a sealed storage battery of the present invention.

FIG. 2 is a view on arrow A in FIG.

3 is an explanatory diagram showing a state in which a sealing material is provided on the electrode shown in FIG.

FIG. 4 is a perspective view showing a state where the electrode shown in FIG. 1 is housed in various battery containers.

[Explanation of symbols]

 1 Electrode 2 Negative Electrode Current Collector 3 Negative Electrode Material 4 Separator (Insulating Material) 5 Positive Electrode Active Material 6 Positive Electrode Current Collector 7 Sealing Material

Claims (2)

[Claims] 1. A linear negative electrode current collector is coated with a negative electrode material, an insulating material, a positive electrode active material and a positive electrode current collector in this order, and an electrolytic solution is applied to the negative electrode material, the insulating material and the positive electrode active material. A sealed type storage battery comprising an impregnated electrode. 2. The sealed storage battery according to claim 1, wherein an end surface of the electrode is sealed with a sealing material.