JPS59696Y2 - Kandenchi - Google Patents

Description

[Detailed description of the invention] This invention relates to improving the cathode terminal plate of a dry cell battery, and aims to improve the leakage resistance of the dry cell battery.

Conventionally, as shown in FIG. 1, a dry cell battery is constructed by abutting a cathode terminal plate 2 having a planar peripheral edge on the bottom surface of a zinc wire 1 which is sealed with a power generating element inside, and the lower end of a resin tube 3. The zinc wire 1 is covered with a resin tube 3 so as to cover the peripheral edge of the cathode terminal plate 2, and an insulating ring 4 is disposed opposite the peripheral edge of the cathode terminal plate 2, so that the outer edge 5 It is fastened.

The resin tube 3 insulates the zinc wire 1 and the exterior edge 5, and retains the electrolyte leaking from the zinc wire 1 due to discharge in the gap between the zinc wire 1 and the resin tube 3 to prevent leakage to the outside. This is to prevent it.

By the way, in the dry battery made in this way, it is necessary to tighten the exterior edge 5 with a fairly strong force in order to make the zinc wire 1, the cathode terminal plate 2, and the resin tube 3 come into close contact with each other. The elasticity of the insulating ring 4 may be impaired and the sealing force may be reduced.

As a countermeasure to this, the peripheral edge of the cathode terminal plate was bent upward to form a dish shape and fitted onto the lower edge of the zinc wire to improve electrical contact, and the resin tube was then covered as described above. A method was proposed in which the insulating ring was wrapped and fastened at the outer edge with a force that would not damage the elasticity of the insulating ring.

However, in this case as well, since the resin tube is simply pressed flat against the cathode terminal plate, leakage prevention is incomplete.

FIG. 2 shows a dry battery of the present invention, in which a metal plate is provided with an upward annular protrusion that contacts the bottom surface of the zinc wire 1, and a cathode terminal plate 7 in which the outer peripheral edge of the annular protrusion protrudes downward in the shape of a mountain.
is in contact with the bottom of the zinc wire 1, and the lower end of the resin tube 3 is
The zinc wire 1 is encapsulated with a resin tube 3 so as to cover the protrusion 6, and an insulating ring 4 is disposed opposite the protrusion 6 to form an exterior edge 5.
It is fastened with

According to this structure, when the exterior edge 5 is placed over the zinc wire 1 and tightened, the protrusion 6 of the cathode terminal plate 7 is pressed, expands slightly outward, and comes into elastic contact with the bottom of the zinc wire 1. and protrusion 6
Since the lower end of the resin tube 3 is firmly held between the pointed end of the resin tube 3 and the insulating ring 5, the liquid-tightness is good. Since good contact is maintained between the cathode terminal plate 7, the bottom surface of the zinc wire 1, and the resin tube 3, leakage of the electrolytic solution is prevented and the electrical connection is not damaged.

Furthermore, when the edge of the cathode terminal plate 7 expands outward due to the tightening force of the outer wire, it comes into close contact with the resin tube 3 at the point where it comes into contact with the resin tube 3, thereby further improving the liquid tightness.

[Brief explanation of the drawing]

FIG. 1 is a cutaway diagram of the main parts of a conventional dry cell battery, and FIG. 2 is a cutaway diagram of the main parts of a dry cell battery according to an embodiment of the present invention. 1...Zinc can, 3...Resin tube,
4...Insulation ring, 5...Exterior wire, 6
...Protrusion, 7...Cathode terminal plate.

Claims (1)

[Scope of utility model registration request] A metal plate is provided with an upward annular protrusion that contacts the bottom surface of the zinc wire 1, and the cathode terminal plate 7, which has the outer peripheral edge of the annular protrusion formed into a downward mountain shape to protrude, is brought into contact with the bottom surface of the zinc wire 1. A dry battery in which a zinc wire 1 is wrapped in a resin tube 3 so that the lower end of the tube 3 covers a protrusion 6, an insulating ring 4 is disposed opposite the protrusion 6, and is fastened with an exterior edge 5.