JPS5915387Y2 - alkaline battery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the sealing structure of an alkaline battery and aims to improve leakage resistance.

FIG. 1 shows a conventional alkaline battery.

An anode 2, a separator 3, and a cathode 4 are sequentially loaded into a battery container 1 which also serves as an anode current collector, and the opening is closed with a gasket 5 and a sealing plate 6.

The lower end of the resin tube 7 attached to the battery container 1 is bent inward along the periphery of the lower surface of the sealing plate 6, and the lower end is crimped to the lower surface of the sealing plate 6 by tightening the exterior edge 8.

However, in this alkaline battery, the electrolytic solution leaking from the joint between the opening edge of the battery container 1 and the gasket 5 travels down the inner surface of the resin tube 7, and in a relatively short period of time, the electrolyte leaks from the joint between the opening edge of the battery container 1 and the gasket 5, and the sealing plate 6 and the resin tube 7 are separated from each other in a relatively short period of time. It has the disadvantage that it leaks from between the holes.

The present invention eliminates such drawbacks, and an embodiment thereof will be described with reference to FIG. 2.

A cylindrical anode 12 mainly made of manganese dioxide is inserted inside the battery container 11 which also serves as an anode current collector, and zinc powder and gel are inserted into the hollow part of the anode 12 through a separator 13. Cathode 1 consisting of a mixed substance of alkaline electrolyte
4 is loaded.

A synthetic resin gasket 16 having an electrolyte reservoir recess 15 in the center of the lower surface is fitted into the opening of the battery container 11 .

An inner resin tube 17 and an outer resin tube 18 made of heat-shrinkable polyvinyl chloride tubes are attached to the outer periphery of the battery container 11 in a double layer, and the upper ends 19.20 of each tube 17.18 are It is bent inward along the periphery of the upper surface of the anode terminal plate 21 placed on the top surface of the battery container 11 .

The lower end 22 of the inner resin tube 17 is bent inward along the periphery of the lower surface of the gasket 16, and the tip of the lower end 22 extends to the electrolyte reservoir recess 15.

A flat contact plate 24 made of a metal plate is fixed to the base end of the cathode current collector 23 inserted into the cathode 14 by spot welding, and the outer diameter of the plate 24 is designed to be smaller than the outer diameter of the sealing plate 25. ing.

Further, a chevron-shaped annular raised portion 30 that projects upward is formed on the periphery of the contact plate 24 .

The current collector 23 is inserted into the cathode 14 by passing through the center hole of the gasket 16, and the annular raised portion 30 of the contact plate 24 is inserted.
is brought into contact with the lower end 22 of the inner resin tube 17.

Apply the sealing plate 25 to the contact plate 24, and close the outer resin tube 1.
The lower end 26 of the outer resin tube 18 is not bent along the lower surface periphery of the sealing plate 25, and a seal ring 27 is brought into contact with the lower end 26 of the outer resin tube 18, and the metal exterior edge 28 is tightened.

By tightening the exterior edge 28, the annular raised portion 3 of the backing plate 24
0, the lower end 22 of the inner resin tube 17 is the gasket 16
The lower ends 26 of the outer resin tube 18 are crimped to the lower peripheral parts of the sealing plate 25, respectively.

As mentioned above, the present invention provides a battery container 1 containing a power generation element therein.
1 is closed with a gasket 16 and a sealing plate 25, and the exterior edge is fitted to the outside of the battery container 11 via a resin tube, and the gasket 16 and sealing plate 2 are closed at the end of the exterior edge 28.
In an alkaline battery formed by tightening battery container 1
1, the inner resin tube 17 and the outer resin tube 18 are attached in a double layer, and the lower end of the inner resin tube 17 is bent inward along the lower surface periphery of the gasket 16, and the lower end bent portion 22 is bent inwardly. The electrically conductive sealing plate 2 is attached to the base end of the current collector 23 that extends to the electrolyte reservoir recess 15 provided on the lower surface of the gasket 16 and is press-fitted into the gasket 16.
The inner resin tube 1 has an outer diameter smaller than the outer diameter of 5.
A contact plate 24 provided with an annular raised portion 30 that contacts the lower end bent portion 22 of the inner resin tube 17 is fixed, and a sealing plate 25 is placed below the lower end bent portion 22 of the inner resin tube 17 via the corresponding plate 24. By tightening the exterior edge 28 without bending the lower end of the outer resin tube 18 inward along the lower peripheral edge of the sealing plate 25, the lower end of the inner resin tube 17 is bent at the annular raised portion 30 of the contact plate 24. It is characterized in that the curved portion 22 is crimped to the gasket 16, and the lower end of the outer resin tube 18 is crimped to the sealing plate 25.

By adopting such a configuration, the tightening force of the exterior edge 28 is concentrated on the annular protrusion 30, and the lower end bent portion 22 of the inner resin tube 18 is brought into close contact with the gasket 16 with locally high contact pressure. can do.

Therefore, when the electrolyte leaks from the joint between the opening edge of the battery container 11 and the gasket 16, the electrolyte flows down the inner surface of the inner resin tube 17.

As mentioned above, since the lower end bent portion 22 of the inner resin tube 17 is locally crimped to the gasket 16 by the annular raised portion 30 of the contact plate 24, most of the leaked electrolyte is absorbed between the gasket 16 and the lower end bent portion. 22 to prevent leakage.

Further leakage from the contact surface between the gasket 16 and the lower end bent portion 22 reaches the electrolyte reservoir recess 15 and is mostly retained there.

A portion of the retained electrolyte further reaches between the lower end new curved portion 22 and the annular raised portion 30, but since local compression is performed even during this time, leakage to the outside is effectively prevented.

Furthermore, the electrolyte that has passed through this crimp part is transferred to the outer resin tube 1.
It descends along the inner surface of the sealing plate 25 and leaks out through the contact surface with the peripheral portion of the sealing plate 25.

By doubling the resin tube in this way,
The electrolyte leakage path is longer than the conventional one, and the electrolyte reservoir recess 15 is sandwiched in the middle of the leakage path, and there are local crimped parts on the upstream and downstream sides of the recess 15.
There is almost no leakage of electrolyte to the outside.

Further, in the conventional alkaline battery shown in FIG. 1, the current collector 9 is not necessarily fixed at the center of the sealing plate 6, but may be fixed at a position slightly shifted from the center.

If a battery is assembled using one in which the current collector 9 is fixed unevenly, when the sealing plate 6 and gasket 5 to which the current collector 9 is fixed are placed in the opening of the battery container 1, the current collector Since the body 9 is supported by the gasket 5, it is disposed at the center, but the sealing plate 6 is shifted from the center by the displacement dimension of the current collector 9.

When the end of the exterior edge 8 is bent inward and tightened, the end of the exterior edge 8 pushes the sealing plate 6 to the center position and the tightening is fixed.

As the sealing plate 6 moves, the current collector 9 also moves, and therefore, the contact pressure decreases at a certain part of the contact surface between the gasket 5 and the current collector 9, and the electrolyte tends to creep.

Further, in other parts, the circumferential surface of the current collector 9 is locally pressed against the gasket 5, generating large internal stress, and the gasket 5 becomes susceptible to stress cracking.

These causes cause liquid leakage from the current collector 9 side.

On the other hand, if the structure of the present invention is adopted, the current collector 23
Since the sealing plate 25 and the sealing plate 25 are not in a fixed relationship, and the outer diameter of the sealing plate 24 is smaller than that of the sealing plate 25, even if the current collector 23 is fixed slightly offset from the center of the sealing plate 24, the sealing plate 24 will not close. Board 2
5, the current collector 23 does not move in the horizontal direction due to the tightening of the outer can 28.

Therefore, disadvantages such as a local decrease in the contact pressure between the gasket 16 and the current collector 23 and stress cracking in the gasket 16, which are conventional, are eliminated.

In addition, since the contact plate 24 does not move in the horizontal direction during tightening, the annular protrusion 30 provided on the contact plate 24 does not scratch the lower end 22 of the inner resin tube 17. The effect can be fully demonstrated.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a conventional alkaline battery, and FIG. 2 is a sectional view of a main part of an alkaline battery according to an embodiment of the present invention. 11...Battery container, 15...Concavity for electrolyte reservoir, 16...Gasket, 17...
...Inner resin tube, 18...Outer resin tube, 22...Lower end of inner resin tube, 25
... Sealing plate, 26 ... Lower end of outer resin tube, 28 ... Exterior can, 30 ...
Annular ridge.

Claims (1)

[Scope of utility model registration request] The opening of the battery container containing the power generation element is closed with a gasket and a sealing plate, the outer edge is fitted to the outside of the battery container via a resin tube, and the gasket and sealing plate are closed at the end of the outer edge. In an alkaline battery made by tightening, an inner resin tube and an outer resin tube are attached to the battery container in duplicate, and the lower end of the inner resin tube is newly bent inward along the lower periphery of the gasket, and the lower end is bent. The part extends to the electrolyte reservoir recess provided on the lower surface of the gasket, and the base end of the current collector to be press-fitted into the gasket is provided with a conductive part having an outer diameter smaller than the outer diameter of the sealing plate. A sealing plate provided with an annular protrusion that abuts the newly bent portion of the lower end of the inner resin tube is fixed, and a sealing plate is placed below the bent portion of the lower end of the inner resin tube via the plate, and the sealing plate is placed below the bent portion of the lower end of the inner resin tube. The lower end of the sealing plate is bent inward along the lower peripheral edge of the sealing plate, and by tightening the outer edge, the annular raised part of the plate serves as a gasket for the bent lower end of the inner resin tube, and the lower end of the outer resin tube is tightened. An alkaline battery characterized by being crimped onto a sealing plate.