JPH053026A - Organic electrolytic battery - Google Patents

Abstract

PURPOSE:To provide an organic electrolytic battery having an increased liquid- leakage resistance by forming a sealing plate having a high mechanical strength while it is kept to have a high discharge capacity, using a sealing plate consisting of a thin plate which can be deformed by caulking seal technique. CONSTITUTION:The organic solvent battery comprises a sealing plate 1 0.2mm thick, which sealing plate 1 has a peripheral edge portion having a U-shaped cross section, a central flat portion 7, and an inclined portion 8 between the peripheral edge portion and the central flat portion 7 and is sealed by inwardly caulking the opening portion of a battery vessel 2 via a gasket 3. Use is made of the sealing plate having a curved portion 9 connecting the flat portion 7 and an inclined portion 8, the inner surface of which curved portion 9 has a radius R of 0.5mm or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of discharge electric capacity and leakage resistance of an organic electrolyte battery using lithium as a negative electrode and an organic solvent as an electrolyte.

[0002]

2. Description of the Related Art Sealing plates for conventional organic electrolyte batteries have been used by nickel-plating stainless steel as a material. Further, in order to increase the internal volume of the battery, the battery case and the sealing plate are made thin, and the inner radius R ′ of the curved portion connecting the central flat portion and the inclined portion is made small. As shown in FIG. 2, R '= 0.15 mm and R = 0.
At 5 mm, R'has a larger battery internal volume. Therefore, the radius R'of the inner surface of the curved portion of the conventional sealing plate is 0.
The thickness was set to 15 mm, and the electrolytic solution was enclosed accordingly.

[0003]

However, in recent years, it has been attempted to increase the discharge capacity even if the height and the outer diameter of the battery are the same. For this reason, the plate thickness of the battery case and the sealing plate has gradually decreased. When the plate thickness of the stainless steel material of the sealing plate exceeded 0.25 mm, there was no problem in the sealing property even if the inner radius R'of the curved portion of the sealing plate was about 0.15 mm. However, when the plate thickness becomes 0.25 mm or less, when the battery is assembled using the sealing plate in which the inner radius R'of the curved portion is processed to 0.15 mm, the inner volume increases as the plate thickness becomes thinner, The peripheral portion having a U-shaped cross section which is pushed inward by the gasket during crimping is deformed, the curved portion is further bent, the compressive force of the gasket is reduced, and there is a drawback that liquid leakage easily occurs.

The present invention has been made in order to solve such a problem. Even if the sealing plate of the battery is thin, the inner radius of the curved portion is 0.5 mm or more, so that a high capacity can be obtained. It is intended to obtain an organic electrolyte battery having excellent leakage resistance.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a sealing plate made of a thin plate having a peripheral portion having a U-shaped cross section, a central flat portion, and an inclined portion between the peripheral portion and the central flat portion, In an organic electrolysis battery in which a battery case opening is caulked inward through a gasket for sealing, an inner plate radius R of a bent portion connecting the flat portion and the inclined portion is 0.5 mm or more is used. It is an organic electrolyte battery characterized by the above.

[0006]

In the present invention, since the radius R of the inner surface of the bent portion is 0.5 mm or more, even if the sealing plate has a plate thickness of 0.25 mm or less, the opening portion of the battery case is bent inward to seal it. In this case, since the inner radius R of the bent portion is large, the bent portion does not lose its strength to support and the sealing pressure is sufficiently supported through the gasket, and the sealing plate and the gasket can be tightly sealed. it can. Therefore, it is possible to obtain an organic electrolyte battery having excellent liquid leakage resistance.

[0007]

EXAMPLES Hereinafter, organic electrolyte batteries of Examples will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a battery according to an embodiment of the present invention.
1 is a 0.2 mm thick stainless steel sealing plate,
Reference numeral 2 is a stainless steel battery case, 3 is a gasket made of polypropylene, 4 is a positive electrode mixture made of manganese dioxide, a conductive material and a binder, 5 is lithium negative electrode active material, and 6 is a polypropylene non-woven fabric. In the separator, the electrolyte is propylene carbonate and 1,2
Lithium perchlorate is dissolved in a mixed solvent of equal volume with dimethoxyethane, and the separator is impregnated and sealed in the battery.

Next, the radius of the inner surface of the curved portion of the sealing plate 1 made of stainless steel having a thickness of 0.2 mm is set to 0.2 mm and 0.3.
Fifty batteries A, B, C, D, and E, which were the same as those in the examples except that the thicknesses were 0.4 mm, 0.4 mm, 0.5 mm, and 0.6 mm, were assembled, and a leakage resistance test was performed. These batteries A, B, C,
During the cycle, 50 pieces of each of D and E were subjected to a temperature cycle of a temperature of 60 ° C. for 1 hour, a temperature decrease to −10 ° C. for 1 hour, a temperature of −10 ° C. for 1 hour, and a temperature increase to 60 ° C. for 1 hour. Table 1 shows the number of leaked batteries.

[0009]

[Table 1]

From Table 1, the organic electrolyte batteries D and E of the present invention using the sealing plate in which the inner surface radius R of the curved portion connecting the central flat portion and the inclined portion of the sealing plate are 0.5 mm or more, It can be seen that the liquid leakage resistance is excellent.

[0011]

As described above, according to the present invention, the sealing plate,
Since the battery case has a thin plate, a large electric capacity can be obtained, and by bending the inner radius of the bent portion to 0.5 mm or more to obtain mechanical strength and strong caulking, an organic electrolyte battery with good leakage resistance can be obtained. Can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a button type organic electrolyte battery of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the sealing plate of the present invention.

[Explanation of symbols]

 1 Sealing Plate 2 Battery Container 3 Gasket 7 Flat 8 Inclined 9 Curved R Inner Radius

Claims (1)

Claims: 1. A peripheral portion having a U-shaped cross section, a central flat portion,
In an organic electrolyte battery in which a sealing plate made of a thin plate having an inclined portion between the peripheral portion and a central flat portion is caulked inwardly through a gasket to seal an organic electrolyte solution battery, the flat portion and the inclined portion The radius R of the inner surface of the curved portion connecting the curved portion and the curved portion is 0.
An organic electrolyte battery characterized by using a sealing plate having a size of 5 mm or more.