JPS5821475Y2 - Button battery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a button type battery, and particularly to its sealed structure.

Conventionally, as shown in FIG. 1, in a typical button type battery, the open end of the battery case 14 is connected to the battery lid through a plastic gasket 13 between the battery lid 11 and the battery case 14. It is tightly compressed and sealed by bending it in the direction of 11.

By the way, in button-type batteries, K is used as the electrolyte 15 in order to enhance the reaction between the anode active material and the cathode active material and improve performance.
It is customary to use an alkaline solution such as OH or NaOH to add as much as possible into the battery space.

However, as is well known, alkaline liquid has the property of easily creeping into metal members (creeping phenomenon), so the so-called caulking type sealing structure as described above is generally used.

However, this also has major drawbacks.

That is, since mechanically strong pressure is required in the sealing process, the alkaline electrolyte 15 often wets the periphery of the battery lid 11 and the battery case 14 or scatters to the outside of the battery.

When such batteries are released on the market, they have the disadvantage that the electrolyte creep rate is extremely high, and electronic devices and the like in which they are used are easily corroded.

In order to eliminate these drawbacks, a battery has been proposed in which the battery lid has a cathode terminal and a metal ring placed around it that are glued together using glass, and the metal ring is welded to the battery case. (For example, see Utility Model Publication No. 41-9457).

According to this structure, since the electrode cover and the battery case are welded together, it is possible to prevent the electrolyte from leaking between these two.

However, the problem remains that the glass, which is one of the constituent members of the battery lid, comes into contact with the alkaline electrolyte, and the glass is gradually corroded by the alkaline electrolyte over a long period of time.

The present invention aims to solve such problems and provide a button-type battery that is free from corrosion due to alkaline electrolyte over a long period of time.

That is, in the present invention, the flange of the cathode can and a metal ring are integrated with glass to form a battery cover, and the flange of the cathode can and the battery case are integrated with the battery cover integrated with the battery case. By interposing a cushion ring in between, the glass of the battery lid is prevented from coming into contact with the alkaline electrolyte, thereby preventing its corrosion.

The present invention will be explained below by giving an example and referring to the drawings.

FIG. 2 is a sectional view of a main part of an embodiment of the present invention.

1 is a cathode wire that also serves as a cathode terminal, 2 is a metal ring, and 3 is an insulating glass. These three components constitute a battery cover, and this battery cover and a battery case 4 that also serves as an anode terminal form a container for a button-type battery. is configured.

The above-mentioned battery cover has an airtight terminal structure, and its constituent members include a cathode case 1 made of a Kovar alloy material clad with copper on the inside, a metal ring portion 2 made of a Kovar alloy material, and both of which are made of a Kovar alloy material. The insulating glass portion 3 is made of borosilicate-based hard glass with good sealing properties.

In particular, the cathode wire 1 is provided with a flange 1a having a concave cross section so as to cover the insulating glass 3 inside the battery.

This is a measure to protect the insulating glass portion 3 from the alkaline electrolyte 5, since glass generally has the property of being corroded by alkali, albeit very slowly at room temperature.

Another measure has also been taken in this regard.

That is, while press-fitting the cushion ring 7 made of nylon (or fluororesin, vopropylene, rubber, etc.) and having an outer diameter slightly larger than the inner diameter of the battery case 4 and an L-shaped cross section into the battery case 4, The back bottom of the flange portion 1a of the cathode ray 1 of the lid is pressed onto the separator 6 that partitions the negative and positive electrode materials.

By doing this, the alkaline electrolyte is applied to the insulating glass 3.
It is designed to prevent water from leaking into the sealed area.

The metal ring 2 has a projection 2a to facilitate resistance welding with the battery case 4, and this part is joined to the flange part 4a of the battery case and resistance welded to seal the button type battery. It is threatening the structure.

As explained above, the sealed structure of the button-type battery according to the present invention is composed of an airtight terminal part and a resistance weld part, which have a reputation for sealing reliability in manufacturing stems for semiconductor devices and can sealing semiconductor devices. In addition, a flange is installed to protect the components from the corrosive nature of the unique alkaline electrolyte, and a cushion ring is also installed, so there is no leakage phenomenon like in the past, even over a long period of time. Therefore, it is a very useful sealed structure that eliminates any troubles such as damage to equipment due to leakage of button batteries.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a typical sealed structure of a conventional button-type battery, and FIG. 2 is a cross-sectional view of essential parts for explaining an embodiment of the button-type battery of the present invention. 1... Cathode ray, 1a... Flange part,
2...Metal ring, 2a...Projection part of metal ring, 3...Insulating adhesive glass, 4.14...Battery case, 4a...・・・
・Flange part, 6, 16...Separator, 7・
...Cushion ring, 8,18...Cathode active material, 9,19...Anode active material, 13...
... Packkin, 5,15 ... Alkaline electrolyte impregnated material.

Claims (1)

[Scope of utility model registration request] The battery case is constructed by welding the metal ring to the flange of the battery case. A button-type battery, characterized in that the cushion ring is pressed and held by the surface of the flange portion of the cathode housing opposite to the glass side and the inner surface of the battery case.