JPS60189158A - Sealed alkaline battery - Google Patents

Abstract

PURPOSE:To obtain a sealed battery which has improved liquid leakage resistance and in which no short circuits occur even after it is installed in an electric apparatus by coating the entire outer surface of the negative can with an insulating paint film and forming a copper film on an area of the outer surface of the negative can around which a positive can is attached. CONSTITUTION:Copper plating 2d is performed on the inner surface of the bottom 2a of a negative can 2 the entire surface of which is plated with nickel, on the inner surface of the circumferential cylindrical section 2b of the negative can 2 and on a part of the outer surface of the cylindrical section 2b around which the circumferential cylindrical section 1a of a positive can 1 is attached by sintering. The inner and the outer surfaces of the circumferential cylindrical section 2b of the negative can 2 are coated with insulating paint films 2e. Because a copper surface along which electrolyte can easily moves up and on which cuts are easily formed only extends up to the area around which the circumferential cylindrical section 1a of the positive can 1 is attached and a nickel surface on which cuts are hardly formed is situated over the above area, any liquid leakage is prevented. Furthermore, because the outer surface of the negative can 2 is coated with the insulating paint film 2e, any short circuits do not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed alkaline battery used in small electronic devices such as watches, calculators, and cameras.

An example of a conventional sealed alkaline battery of this type will be explained with reference to a vertical cross-sectional half-mounted view shown in FIG.

In the figure, reference numeral 1 denotes an anode can made of a metal material and having a cylindrical cross-sectional shape with a bottom. Reference numeral 2 denotes a cathode can made of a metal material and having a cylindrical shape with a bottom in cross section.
It has a stepped portion 2c in the middle of the inner wall, and the entire surface is nickel plated. Furthermore, copper plating 2d is applied on the inside of the expanded surface 2a of the cathode can 2 and the outer cylindrical portion 2b, and an insulating coating 2e is applied on the copper plating 2d of the outer cylindrical portion 2b. It is covered with Outer cylindrical portion 1 of the anode can 1
By baking the inner surface of a and the outer surface of the outer cylindrical portion 2b of the cathode can 2, the anode can 1 and the cathode can 2 are sealed to form a battery case.

3 is a cathode active material made of frozen zinc powder, and NaOH
, contains an electrolyte of KOH aqueous solution. 4 is a separator made of sehan and a reinforcing film.

5 is an anode active material made by adding a small amount of graphite powder to silver oxide or silver peroxide, and the outer periphery thereof and the stepped portion 2c provided in the middle of the inner wall of the outer cylindrical portion 2b of the cathode can 2, The outer periphery 4a of the separator 4 is held between them.

One of the disadvantages of a battery having such a structure is that leakage sometimes occurs. If the surface of the base copper plating 2d of the insulating coating 2c on the outer wall of the outer cylindrical portion 2b of the cathode can 2 occasionally has large scratches or surface roughness, remove the scratches and surface roughness from above the insulating coating 2e to the anode can 1. Even if the outer circumferential cylindrical portion 1a is pressed with a strong force, the insulating coating 2e will not be completely buried in the scratches and surface roughness, and the electrolyte will creep up through the space and leak from below the insulating coating 2e. Area 2f where copper plating 2d peeks out
It was showing leakage.

Furthermore, in the case of a battery with a conventional configuration, as shown in FIG. (B) As shown in the figure, when one end of the anode can 1 receives a force P caused by the terminal pressure or the battery insertion pressure, the metal part of the cathode can 2 is inserted into the cathode terminal A. In addition, it may also come into contact with battery guide B, causing a short circuit phenomenon.

The present invention was made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a sealed alkaline battery that has improved leakage resistance and further prevents short circuits when the battery is inserted into equipment. The gist of achieving the object is as described in the claims above.

Next, a detailed explanation will be given based on FIG. 2, which is a longitudinal cross-sectional half-mounted view of a preferred embodiment of the present invention. Incidentally, the same parts as in FIG. 1 are designated by the same reference numerals 5, and the description thereof will be omitted.

In FIG. 2, 2d is the inner side of the bottom surface 2a of the cathode can 2, which is fully nickel plated, the inner wall of the outer cylindrical part 2b of the cathode can 2, and the outer wall of the outer cylindrical part 2b, and the outer periphery of the anode can 1. This is copper plating applied to the portions of the cylindrical portion 1a that will be soft-bonded by baking. 2e is an insulating coating coated on the inner and outer walls of the outer cylindrical portion 2b of the cathode can 2, and is coated over the entire surface of the outer wall.

In the battery of the present invention, the base 2 of the insulating coating 2e has a large creeping force for the electrolyte, and the copper surface, which is easily scratched, is baked in the outer cylindrical portion 1a of the anode can 1. This is the part where the electrolyte is fitted and discharged, and beyond that point, there is a short nickel surface where the creeping force of the electrolyte is small and there are scratches, etc., so even if sometimes the liquid leaks up to the copper plated tip. Even if it does, the electrolyte will not creep up beyond that point and no leakage will occur.

Furthermore, as shown in FIG. 3 (b), even if the battery is tilted in the battery hole of the device and the outer wall of the cathode can 2 comes into contact with the battery guide B, the outer wall of the cathode can 2 Since it is coated with the insulating coating 2e, there is no electrical continuity and no short circuit occurs.

As explained above, in the present invention, the outer wall of the cathode can is entirely coated with an insulating coating, and the part to which the anode can is discharged is made of silver, which improves leakage resistance and further improves the ability of the equipment to Is it a sealed alkaline type that does not cause short circuit after insertion? The practical effect is extremely large.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional half-sectional view of a conventional sealed alkaline battery.
FIG. 2 is a vertical cross-sectional half-mounted view of a sealed alkaline battery according to an embodiment of the present invention, and FIG. 3 is a horizontal view of the battery being inserted into a device. DESCRIPTION OF SYMBOLS 1... Anode can, 2... Cathode can p 2b... Outer cylindrical part s' 2d... Copper plating, 2e... Insulating coating film 3... Cathode active material, 4... Separator , 5... Anode active material 1980 Patent Application No. 043596 20 Name of the invention Sealed alkaline battery 3 Relationship with the case of the person making the amendment Patent applicant 5 No number of inventions increased by the amendment 6 , target of correction, content of correction

Claims (1)

[Claims] A cathode can with a mouth-like cross-sectional shape, a stepped part in the middle of the inner wall of the cylindrical part, and an insulating coating on the entire or m-surface of the cylindrical part; A case is formed by an anode can whose part is attached to the outer peripheral surface of the cylindrical part of the cathode can, and the case is divided by a separator whose outer periphery is placed on a stepped part provided in the middle of the inner wall of the cylindrical part of the cathode can. In a sealed alkaline battery in which a cathode active material and an anode active material are enclosed and hermetically sealed, the outer wall of the cathode can is entirely coated with an insulating coating, and the portion covered by the anode can is made of an earth-resistant material. A sealed alkaline battery characterized by