JPS5931003Y2 - battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a battery in which a power generation element is sealed by a first container and a second container whose opening is sealed via a gasket.

BACKGROUND ART In recent years, due to rapid advances in semiconductor technology, various battery-applied devices, such as electronic desk calculators, electronic wristwatches, and various precision measuring instruments, have diversified, and the shapes of batteries have also diversified accordingly.

Among these, containers having one polarity that are composed of a small diameter part and a large diameter part are widely used because the terminal design of applied equipment is extremely easy.

The conventional structure of this type of battery is explained with reference to FIG.
is a first metal container that also serves as a terminal for one electrode, for example, an anode, and has a small diameter portion 2, a large diameter portion 3, and a connecting portion 4 that connects the two.

5 is a second metal container which also serves as a terminal for the other electrode, for example, a cathode; 6 is an anode active material; 7 is a separator; 8 is an electrolyte-impregnated material; 9 is a cathode active material; and 10 is a gasket.

This battery usually consists of a container 1 containing an active material 6, a separator 7, and an electrolyte-impregnated material 8, and a container 5 containing an active material 9 and a gasket 10 fitted or molded around the periphery. , is assembled by tightening the opening of the case 1 inward.

In a battery with such a structure, the connecting part 4 of the container 1 plays the role of supporting the gasket 10;
Since the length of the container 5 is extremely short, the gasket 10 may slip down after sealing, the compressed state of the gasket may become uneven, and in extreme cases, the container 5 may fall down.

In addition, in order to improve this drawback, if the inner diameter φ1 of the small diameter portion of the container is reduced to φ1' as shown by the broken line in FIG. 2, a difference will be created in the opposing areas of the active materials 6 and 9. , a disadvantage arises in that the utilization rate of the battery active material, that is, the reaction efficiency deteriorates.

The present invention solves the above-mentioned conventional drawbacks, and provides a battery with a high utilization rate of active material and a high sealing effect.

That is, as shown in FIG.
It is characterized in that it is inclined so that it is lower than the inner part 4b.

According to this configuration, the end of the gasket 10 is press-fitted into the recess formed inside the portion 4a by pressure during sealing, and the portion 4b and the end of the container 5 sandwich the horizontal portion of the gasket. This eliminates imperfections in sealing due to gaskets slipping off, etc., and improves leakage resistance.

Further, with this configuration, the inner diameter φ1 of the small diameter portion 2 containing the active material 6 of the container 1 is made almost equal to the inner diameter φ2 of the container 5 containing the active material 9, thereby improving the utilization rate of the active material. I can do it.

The angle of inclination of the connecting portion 4 is preferably 3 to 40 degrees as an angle θ with respect to the cross section of the container 1, that is, a plane perpendicular to the axis of the container 1.

If the gasket is less than 3 degrees, the locking effect of the gasket cannot be achieved, and the angle of 40
If the temperature exceeds 100 °C, the mechanical strength of the container will be weakened, cracks may occur, and the shape of the terminals of applied equipment may become complicated.

It goes without saying that the present invention can be applied to general-purpose alkaline batteries as button batteries, but a light metal such as lithium is used as the negative electrode active material, and an aprotic organic solvent such as propylene carbonate, γ-butyrolactone, γ- It can also be applied to an organic electrolyte battery using valerolactone dissolved in an ionic dissociated salt such as lithium perchlorate or lithium fluoroborate.

In this organic electrolyte battery, the specific resistance of the electrolyte is higher than that of an aqueous solution type battery, so it is particularly effective to increase the reaction efficiency by making the facing areas of the negative and positive active materials substantially equal.

As an example, a fluorocarbon-lithium battery having the configuration shown in FIG. 1 using an electrolytic solution in which 1 mol/l of lithium borofluoride was dissolved in γ-butyrolactone and with the connecting portion 4 having an inclination angle of 10° was used. The small diameter portion 2 of the container 1 is arranged as shown by the broken line in Figure 2, so that the ratio of the facing areas of the cathode active material and the anode active material is 1.
: When compared with a battery set to 0.75, the utilization rate of the example was improved by 25 to 30%, and the leakage resistance was 40 to 6.
The result was 0% excellent.

As described above, the present invention provides a battery with excellent characteristics.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a battery showing an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a conventional example. 1... First container, 2... Small diameter portion, 3
...Large diameter part, 4...Connection part, 5...
...Second container, 10...Gasket.

Claims (2)

[Scope of utility model registration request] (1) A first container in which a larger diameter portion is provided on the opening side of the smaller diameter portion via a connecting portion, and the inner diameter of the first container is approximately equal to the inner diameter of the smaller diameter portion of the first container. A battery characterized in that the power generating element is sealed by a second container whose opening is sealed via a gasket, and the connecting part is inclined so that the outer part thereof is lower than the inner part. (2) The battery according to claim 1, wherein the inclination angle of the connecting portion is 3 to 40 degrees with respect to the cross section of the first container.