JP2995431B2 - Organic electrolyte battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an inner battery 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 FIG. A battery with this structure can effectively use the internal volume of the battery, make the volume expansion of the positive electrode due to discharge work only in the height direction of the battery, maintain good contact inside the battery, and have a leakage resistance of 1 ° C at 60 ° C. Time, temperature decrease from 60 ° C to -10 ° C for 1 hour, -10 ° C for 1 hour, -10 ° C to 60 ° C
The temperature was raised to about 10 ° C in a 1-hour temperature cycle.
The liquid did not leak for days.

[0003]

However, the organic electrolyte battery having this structure has a large capacity, and is used for a long time with a very small current. For this reason, with respect to the liquid leakage resistance, a performance higher than that required for the conventional organic electrolyte battery is required. However, in the battery according to the proposed structure, when the outer peripheral upper end of the battery case 22 is assembled by caulking in FIG. 2, the upper flat portion 30 of the inner hat-shaped battery inner case 27 has a rounded shape as shown in FIG.
It bends downward from the part 29. When the upper flat portion 30 is bent, the compression ratio of the bottom portion and the side wall portion 32 of the gasket 23 is reduced, and there is a disadvantage that the liquid leakage resistance is reduced.

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

[0005]

SUMMARY OF THE INVENTION The present invention provides a power generating element comprising a positive electrode formed into a disk shape, a light metal negative electrode, and a separator impregnated with an organic electrolyte, comprising a sealing plate, a battery case,
An organic electrolyte battery sealed by a gasket interposed between the two, and a battery inner case having an inverted hat-shaped cross section in which an upper flat portion is in contact with a bottom portion of the gasket 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.

[0006]

According to the structure of the present invention, the upper flat portion of the battery inner case having an inverted hat-shaped cross section does not bend downward when the battery is assembled by caulking the outer peripheral upper end portion of the battery case.
Since the compression ratio of the gasket bottom and side wall portions can be obtained as designed, leakage resistance can be sufficiently improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention has a diameter of 24 mm and a height of 7.7.
The description will be made using a lithium manganese dioxide battery having a thickness of 2 mm.
FIG. 1 is a longitudinal sectional view of a battery according to an embodiment of the present invention. Reference numeral 1 denotes a sealing plate serving also as a stainless steel negative electrode terminal, and reference numeral 2 denotes a battery case serving also as a stainless steel positive electrode terminal. Reference numeral 3 denotes a gasket made of polypropylene, and reference numeral 4 denotes a positive electrode obtained by molding a positive electrode mixture containing manganese dioxide, a conductive material, and a binder into a pellet having a diameter of 20 mm and a height of 5 mm. Reference numeral 5 denotes a lithium negative electrode serving as a negative electrode active material, 6 denotes a separator made of polypropylene, 7 denotes a battery inner case made of a stainless steel having an inverted hat-shaped cross section, and a lower flat portion 11 abuts the battery case 2. 8 is a current collector. As the electrolytic solution, a solution prepared by dissolving lithium perchlorate in an equal volume mixed solvent 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 inner case 7 made of an inverted hat-shaped stainless steel cross section is 200, 250, 300, 350, 40.
The batteries having 0, 450, 500, and 550 Hv were assembled as A, B, C, D, E, F, G, and H, respectively, and 30 batteries were assembled.
The bend 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
When the hardness of the R portion 9 connecting the two is set to 250 Hv or more, the upper flat portion 10 has less bending.

Next, the remaining 20 batteries were cooled to 60 ° C. for 1 hour, the temperature was lowered to −10 ° C. for 1 hour, and the temperature was lowered to −10 ° C. for 1 hour.
Table 2 shows the leakage resistance after a temperature cycle in which the temperature was raised to 60 ° C. for 1 hour. Table 2 shows the number of leaked batteries among the 20 batteries in which the storage days of the cycle 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 is understood that the liquid leakage resistance is excellent.

Usually, the hardness of a stainless steel plate used for a battery container is about 150 to 250 Hv. When a stainless steel plate having a hardness of about 150 to 250 Hv is processed into a battery inner case having an inverted hat-shaped cross section, the hardness of the R portion can be adjusted to 250 to 500 Hv by adjusting a punching die. However, if it is desired to increase the hardness of the R portion to 500 Hv or more, it is possible to increase the hardness of the stainless steel plate to 250 Hv or more. The part is cut, making processing difficult. Although it is possible to increase the hardness of the R portion by heat treatment, heat treatment costs are increased and corrosion resistance is reduced, which is not desirable.

[0015]

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

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an organic electrolyte battery according to the present invention.

FIG. 2 is a sectional view of a conventional battery of the same type in which an R portion is not cured.

[Explanation of symbols]

 2 ... Battery case 3 ... Gasket 7 ... Battery inner case 9 ... R part 10 ... Top flat part 27 ... Battery case 29 ... R part 30 ... Top flat part

Claims (1)

(57) [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 flat part on the bottom of the gasket,
An organic electrolyte battery sealed with a battery inner case having an inverted hat-shaped cross section in which a lower flat portion is in contact with the battery case, and a hardness of an R portion connecting an upper flat portion and a side wall portion of the battery inner case. Is an organic electrolyte battery having a Vickers hardness of 250 to 500 Hv.