JP2004006418A - Organic electrolyte battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic electrolyte battery with high energy density and capable of easily airtightly sealing an electrolyte pouring hole by improving an existing manufacturing method of the organic electrolyte battery such that, after a battery case is sealed with a sealing plate, an electrolyte is poured from the electrolyte pouring hole formed in the battery case or the sealing plate, the electrolyte pouring hole is sealed with an elecctrolyte pouring plug by resistence welding to unite it with the battery case or the sealing plate. <P>SOLUTION: The organic electrolyte battery is equipped with an aluminum battery case also acting as a positive terminal and an aluminum sealing plate for sealing an opening part of the battery case, the electrolyte pouring hole is formed in the battery case or the sealing plate, and the electrolyte pouring hole is sealed with an aluminum sealing body. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an organic electrolyte battery.

2. Description of the Related Art In recent years, large current and large output have been demanded for batteries as power sources, such as portable information devices such as laptop computers and word processors, camera-integrated VTRs, AV devices such as liquid crystal televisions, and mobile communication devices such as mobile phones. There are various types of devices that have been developed, and there is a demand for higher energy density. A typical example of high energy density is an organic electrolyte battery.

By the way, at present, as a method for manufacturing an organic electrolyte battery, as disclosed in Patent Document 1, first, a positive electrode plate and a negative electrode plate are wound or laminated with a separator interposed therebetween to form an electrode group, and a sealing lid plate is formed. The positive electrode lead and the negative electrode lead, which have been attached in advance, are welded to the leads taken out from the positive electrode plate and the negative electrode plate, and inserted into the battery case. Then, an electrolyte is injected, the opening of the battery case is closed with a sealing cover plate, and the battery case is sealed by laser welding or caulking the upper part of the battery case inward.

However, in this method, the electrolytic solution adheres to the opening of the battery case when the electrolytic solution is injected, and causes a pinhole during laser welding of the battery case and the sealing cover plate. Also, in the caulking, the electrolyte solution adheres to the caulked portion, which causes a liquid leakage. Therefore, as a solution to this problem, after sealing the battery case with a sealing lid plate, an electrolyte is injected from a liquid injection hole formed in the battery case or the sealing lid plate, and then injected using resistance welding. A method has been proposed in which the hole is sealed with a liquid injection stopper and integrated with a battery case or a sealing lid plate.

In this method, there is no defect of the pinhole at the time of laser welding, and there is no liquid leakage even in caulking, so that an excellent mass production effect is brought about.

However, there is a demand for an organic electrolyte battery having a higher energy density and a sealing method free from defects.

Therefore, an aluminum battery case also serving as a positive electrode terminal and an aluminum sealing lid plate for closing an opening of the battery case are provided, and a liquid injection hole is formed in the battery case or the sealing lid plate. The above problem is solved by the invention of an organic electrolyte battery, wherein the injection hole is hermetically sealed by an aluminum sealing body.

According to the organic electrolyte battery of the present invention, an aluminum battery case also serving as a positive electrode terminal and a sealing lid plate for closing an opening of the battery case are provided, and a liquid injection hole is formed in the battery case or the sealing lid plate. Since the liquid injection hole is characterized by being hermetically sealed with an aluminum sealing body, conventionally, a steel battery case or a sealing body generally used for this type of battery has been used. Thus, an organic electrolyte battery having a high energy density and a lighter weight can be provided.

Further, the case or the sealing lid plate and the sealing body in which the injection hole is formed, the melting point is significantly lower than that of conventionally used iron, and the spreadability is significantly higher than that of aluminum, whereby Is greatly deformed along the shape of the liquid injection hole, so that sealing in the liquid injection hole is extremely reliable, and an organic electrolyte battery in which the liquid injection hole is securely hermetically sealed is provided. .

最 良 The best mode for carrying out the invention will be described based on embodiments with reference to the drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Example 1]
FIG. 1 shows a top view and a side sectional view of a main part of a sealed battery according to the present invention. In FIG. 1, reference numeral 1 denotes an aluminum battery case that also serves as a positive electrode terminal and has a built-in power generation element (not shown). Numeral 2 denotes a sealing lid plate, and numeral 3 denotes a spherical sealing body having a diameter of 1.1 mm (the spherical shape is not kept because FIG. 1 shows a view after sealing), both of which are made of aluminum. Reference numeral 7 denotes a liquid injection hole having a diameter of 1 mm. Reference numeral 4 denotes an insulating packing made of a polypropylene resin, 5 denotes a stainless steel rivet also serving as a negative electrode terminal, 6 denotes a stainless steel washer, and a rivet is passed through the through hole of the packing, and the tip of the rivet is crushed and fixed via the washer. . The battery case and the sealing lid plate are sealed by caulking the upper end of the opening of the battery case inward.

(5) After the organic electrolyte was injected from the injection hole, the aluminum sealing body 3 was placed in the injection hole, and the head of the sealing body was integrated with the sealing lid plate by ultrasonic welding to hermetically seal.

FIG. 2A is an enlarged view of a welded portion when the sealing body 3 is welded to the sealing lid plate 2 by ultrasonic waves. First, the sealing body 3 is placed in the injection hole 7 and the ultrasonic horn 18 The sealing body 3 is pressed by utilizing the pressure, and the ultrasonic horn 18 is laterally vibrated, so that the sealing body 3 and the sealing cover plate 2 are welded and integrated.

（(B) of FIG. 2 is an enlarged view after welding, and shows a state where the sealing cover plate 2 and the sealing body 3 are integrated. It should be noted that this figure does not maintain a spherical shape because it is a view after sealing.

FIG. 3 shows a top view and a side sectional view of a main part of the battery of the present invention. In FIG. 3, reference numeral 11 denotes a battery case also serving as a positive electrode terminal, in which a power generation element (not shown) is built, and a A 1 mm injection hole 17 is formed. Reference numeral 12 denotes a sealing lid plate, and 13 denotes a spherical sealing body having a diameter of 1.1 mm, both of which are made of aluminum. 14 is an insulating packing made of a polypropylene resin, 15 is a stainless steel rivet also serving as a negative electrode terminal, 16 is a stainless steel washer, which is made by passing a rivet through a through hole of the packing and crushing the tip of the rivet through the washer. . The battery case and the sealing lid plate were sealed by caulking the upper end of the battery case opening inward.

Then, after injecting the electrolytic solution from the injection hole, the aluminum sealing body 13 was pressed into the injection hole, and the head of the sealing body was integrated with the battery case by ultrasonic welding to be airtightly sealed. It is known from Japanese Utility Model Laid-Open No. 1-14759 that a welding method can be employed for integrating the battery case with the battery case.

In addition, in Example 2, the liquid injection hole was formed on the side of the battery case. However, as shown in FIG. 2, the periphery of the liquid injection hole is a curved surface. When the horn portion of the ultrasonic welding machine was flat, airtight sealing could not be achieved, so the horn of the ultrasonic welding machine was processed according to the shape of the curved surface of the battery case and welding was performed.

FIG. 4 is a cross-sectional view of a main part of a top surface and a side surface of an example battery. The enlarged view of the welding part of the Example battery. FIG. 4 is a cross-sectional view of a main part of a top surface and a side surface of an example battery.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 battery case 2 sealing lid plate 3 sealing plug 4 insulating packing 5 rivet 6 washer 7 liquid injection hole 11 battery case 12 sealing lid plate 13 sealing plug 14 insulating packing 15 rivet 16 washer 17 liquid injection hole 18 ultrasonic horn

Claims (1)

An aluminum battery case also serving as a positive electrode terminal and an aluminum sealing lid plate closing an opening of the battery case are provided, and a liquid injection hole is formed in the battery case or the sealing lid plate. An organic electrolyte battery, wherein the holes are hermetically sealed with an aluminum sealing body.

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