JPH05114406A - Organic electrolyte battery - Google Patents

Abstract

PURPOSE:To prevent bend at an upper flat part of an inner case of a sectional form of an inverted hat of an organic electrolyte battery, eliminate escape of a gasket, seal them uniformly and strongly, and improve a leak resistance property by hardening a round part connecting the upper flat part to a side wall part rigid. CONSTITUTION:An organic electrolyte battery comprises a power generation element sealed by a seal plate 1, a battery case 2, a gasket 3, and an inner case 7 of an inverted hat shape having an upper flat part 10 abutting on a bottom part of the gasket 3 and a lower flat part 11 abutting on the battery case 2. The inner case 7 to be used for this battery has a hardness of the Vickers hardness of 250-500Hv at a radiused part 9 connecting the upper flat part 10 to the side wall part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a battery inner case of an organic electrolyte battery.

[0002]

2. Description of the Related Art Conventionally, an organic electrolyte battery of this type is shown in FIG.
A structure as shown in JP-A-2-12764 is proposed. The battery with this structure can effectively use the internal volume of the battery, and the volume expansion of the positive electrode due to the discharge works only in the height direction of the battery to keep the contact inside the battery in good condition. Time, 60 ° C to -10 ° C for 1 hour, -10 ° C for 1 hour, -10 ° C to 60 ° C
Heating up to ℃ in a temperature cycle of 1 hour, about 10
It showed the characteristic of not leaking for a day.

[0003]

However, the organic electrolyte battery having this structure has a large capacity, and in most applications, it is used for a long time due to a minute current. Therefore, with respect to the liquid leakage resistance, it is necessary to have a performance higher than that required for the organic electrolyte batteries up to now. However, in the battery according to the proposed structure, when the outer peripheral upper end portion of the battery case 22 is assembled by crimping the battery case 22 in FIG.
It bends downward from the part 29. When the upper flat portion 30 is bent, the compressibility of the bottom portion and the side wall portion 32 of the gasket 23 is reduced, and the liquid leakage resistance is deteriorated.

An object of the present invention is to cure the R portion of the battery inner case of an organic electrolyte battery to prevent the upper flat portion from bending and to improve the leakage resistance performance.

[0005]

Means for Solving the Problems The present invention provides a power generation element comprising a disk-shaped positive electrode, a light metal negative electrode, and a separator impregnated with an organic electrolyte, a sealing plate, and a battery case.
An organic electrolyte battery sealed by a gasket interposed between the two and an inner battery case having an inverted hat-shaped cross section in which an upper flat portion is in contact with the gasket bottom portion and a lower flat portion is in contact with the battery case. The hardness of the R portion connecting the upper flat portion and the side wall portion of the battery inner case is Vickers hardness of 250 to 500 Hv, which is an organic electrolyte battery.

[0006]

With the structure of the present invention, the upper flat portion of the battery case having the inverted hat-shaped cross section does not bend downward when the battery is assembled by crimping the outer peripheral upper end of the battery case.
Since the compressibility of the gasket bottom portion and the side wall portion can be obtained as designed, the liquid leakage resistance can be sufficiently improved.

[0007]

EXAMPLE An example of the present invention has a diameter of 24 mm and a height of 7.7.
mm manganese dioxide lithium battery.
FIG. 1 is a vertical cross-sectional view of an example battery of the present invention. Reference numeral 1 denotes a sealing plate that also serves as a negative electrode terminal made of stainless steel, and 2 denotes a battery case that also serves as a positive electrode terminal made of stainless steel. Reference numeral 3 is a gasket made of polypropylene, and 4 is a positive electrode obtained by molding a positive electrode mixture containing manganese dioxide, a conductive material and a binder into a pellet shape having a diameter of 20 mm and a height of 5 mm. Reference numeral 5 is a lithium negative electrode which is a negative electrode active material, 6 is a separator made of polypropylene, and 7 is a battery inner case made of stainless steel having an inverted hat cross section, and a lower flat portion 11 is brought into contact with the battery case 2. 8 is a current collector. As the electrolytic solution, a solution obtained by dissolving lithium perchlorate in a mixed solvent of equal volume of propylene carbonate and 1,2-dimethoxyethane was used.

Here, the hardness of the R portion 9 connecting the upper flat portion 10 and the side wall portion 12 of the battery case 7 made of stainless steel having an inverted hat cross section is set to 200, 250, 300, 350, 40.
Assembling the batteries of 0, 450, 500, 550 Hv as A, B, C, D, E, F, G, and H, 30 pieces each, disassembling 10 pieces of them, and disposing the upper flat portion 1
The bending dimension of 0 was measured, and the results are shown in Table 1.

[0009]

[Table 1]

As shown in Table 1, the upper flat portion 10 and the side wall portion 1
In the case where the hardness of the R portion 9 connecting the two is 250 Hv or more, the upper flat portion 10 has less bending.

Next, the remaining 20 batteries were heated to 60 ° C. for 1 hour, cooled to -10 ° C. for 1 hour, and -10 ° C. for 1 hour.
Table 2 shows the liquid leakage resistance characteristics after a temperature cycle in which the temperature was raised to 60 ° C for 1 hour. Table 2 shows the number of leaked batteries in 20 cells when the cycle storage days were 10, 20, 30, and 40 days.

[0012]

[Table 2]

As described above, the hardness of the R portion 9 connecting the upper flat portion 10 and the side wall portion 12 of the battery inner case 7 is 250 Hv.
In the above cases, it can be seen that the liquid leakage resistance is excellent.

Usually, the hardness of the stainless steel plate used for the battery container is often about 150 to 250 Hv. A stainless steel plate having a hardness of about 150 to 250 Hv can be adjusted to a hardness of 250 to 500 Hv at the R portion by adjusting the punching die at the stage of processing into a battery case having an inverted cross section. However, if the hardness of the R portion is desired to be 500 Hv or more, it is possible to set the hardness of the stainless steel plate to 250 Hv or more, but the abrasion of the punching die is severe, and if the punching die is not properly adjusted, R The part is cut, making it difficult to process. Although it is possible to increase the hardness of the R portion by heat treatment, it is not desirable because it requires heat treatment cost and reduces corrosion resistance.

[0015]

As described above, according to the present invention, it is possible to provide an organic electrolyte battery that effectively uses the internal volume of the battery, has a high capacity, and is excellent in leakage resistance.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an organic electrolyte battery of the present invention.

FIG. 2 is a cross-sectional view of the same type battery in which a conventional R part is not cured.

[Explanation of Codes] 2 ... Battery Case 3 ... Gasket 7 ... Battery Inner Case 9 ... R Part 10 ... Upper Flat Part 27 ... Battery Inner Case 29 ... R Part 30 ... Upper Flat Part

Claims (1)

[Claims] 1. A power generating element comprising a disk-shaped positive electrode, a light metal negative electrode, and a separator impregnated with an organic electrolyte, a sealing plate, a battery case, and a gasket interposed therebetween, Abut the upper flat part on the bottom of the gasket,
An organic electrolyte battery sealed by an inner battery case having an inverted hat-shaped cross section in which a lower flat portion is in contact with the battery case, the hardness of an R portion connecting an upper flat portion and a side wall portion of the inner battery case. Is a Vickers hardness of 250 to 500 Hv.