JPH0337264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of single flat cells stacked on top of each other and connected together along the periphery, with a zinc negative electrode, an alkaline electrolyte, and a manganese dioxide in contact with a metal terminal plate.
This invention relates to a battery in which each battery is comprised of a positive electrode made of compressed carbon and a battery casing in the form of a plastic container, with terminal plates arranged inside and outside the bottom of each container.

Known 9V batteries, approximately 40 mm high, are formed from cylindrical members having a plurality of preferred lengths and thicknesses. These parts are difficult to manufacture and have a rather high scrapping percentage. Furthermore, a large portion of the volume is not utilized effectively and the dimensions are limited.

To this end, flat cells that are stacked on top of each other have been introduced. This cell is described, for example, in Danish patent application no. 5318/78. With this method, a capacity utilization rate of more than 28% has been achieved. Each battery is placed in a plastic container. However, certain problems arise in forming satisfactory contact between the manganese dioxide-carbon compact (the positive electrode body) and the metal terminal plate.

The present invention is based on the achievement of the discovery of a simple means of forming a satisfactory contact between a compressed manganese dioxide-carbon body and a metal terminal plate; The positive electrode is fixed to the negative metal terminal plate by pressing along the edge of the metal terminal plate, preferably along two opposing edges. In the method of the present invention, the manganese dioxide-carbon compressed body can be attached and detached from the sides of a U-shaped metal terminal plate bent along two opposing edges, and is therefore suitable for mass production. The metal terminal plate should be bent inward along two opposing edges by less than 90 degrees, preferably about 1 to 3 degrees.

To facilitate introduction from the side of the manganese dioxide-carbon compact, such compacts preferably have rounded corners.

Since the manganese dioxide-carbon compact can be stretched, the briquettes can be about 0.06 to 0.08 mm smaller than the metal terminal plate when introduced.

The invention will now be described with reference to the accompanying drawings.

The alkaline cell shown in FIG. 1 is formed from a plurality of flat cells stacked on top of each other.

FIG. 1 shows two plastic containers 1, by means of which a battery casing is formed by interconnecting the surfaces 2 by means of an instant process acting on the entire circumference at the same time. Instant processing here refers to, for example, ultrasonic welding, immersion gluing, high temperature welding, high frequency welding or other similar assembly processes.

The lower battery in FIG. 1 is completely fitted with a positive electrode 3 made of a compressed manganese dioxide-carbon body, two separation diaphragms 4, and a negative electrode 5 made of powdered zinc in an alkaline electrolyte. A negative terminal plate 6 with a bent edge is placed above the positive electrode 3 and a terminal plate 7 is placed below the negative electrode 5 at the bottom of the container.

The terminal plates 6 and 7 on the inside and outside of the bottom 8 of the plastic container 1 are interconnected through a hole in the center of the bottom 8. By embossing, in other words, a knob 9 that is pressed between molds to protrude is provided on the terminal plate 7, this knob 9 is protruded into a hole in the bottom of the container, and the tip of this knob 9 is spot-welded to the center of the terminal plate 6. do. terminal board 6,
This spot welding is carried out so that 7 compresses the material of the bottom 8, creating a pressure seal between the terminal plates 6, 7 and the bottom 8.
It is possible to avoid a decrease in contact pressure due to cold flow, ie deformation due to long-term loading at room temperature. Since the terminal plate compresses both sides of the bottom, a double seal is obtained due to the special sealing pressure between the metal of the terminal plate and the plastic polymer of the bottom. This sealing pressure exerts a very large pressure between relatively small seals. In the embodiment shown in FIG. 1, during assembly of the terminal board, the terminal board 7 is closed by a sealing ring 10, such as a rubber torus, which deforms under pressure.
surrounding the knob 9 of. In this way, two separate seals are formed between the metal and the rubber via the air, preventing capillary action.

The manganese dioxide-carbon compressed body 3 is a metal terminal plate 6
bring into contact with. Since the contact between the manganese dioxide-carbon compressed body 3 and the metal terminal plate 6 determines the short circuit current,
It is necessary to satisfy such contact. In the case of a rectangular terminal plate with wraps along all four edges, the wraps would curve outwardly, resulting in poor electrical connection. In the present invention, as shown in FIG. 2, the metal terminal plate 6 is provided with a metal bent portion consisting of a downwardly bent flap along its two opposing edges. These flaps are tilted inward toward each other by approximately 1 to 3 degrees,
The manganese dioxide-carbon compressed body 3 is sufficiently compressed. Of course, the terminal plate 6 can be made of a sufficiently elastic material such as nickel-iron.
This results in a short circuit of 3-5A. Conventional round batteries are not hampered by this problem. This is because such a cathode body can be introduced under pressure to obtain the necessary contact, and the cylindrical member can be subjected to pressure without impairing the contact.

Further, the method of the present invention is suitable for mass production because if the terminal board body is symmetrical and the corners of the compressed manganese dioxide-carbon body are rounded, the compressed body can be introduced from the side.

If desired, the metal terminal plate 6 can be provided with an inwardly bent flap 11, by means of which a predetermined contact can be provided on the bottom surface. The width of the compact is approximately 0.06-0.08 mm smaller than the terminal plate, taking into account that the briquette will stretch slightly when the tension is released by adding electrolyte. In one example, the terminal can be 2.7 mm high, 17.5 mm long, and 13.08 mm wide. The thickness of the material should be approximately 0.1-0.3 mm.

[Brief explanation of the drawing]

FIG. 1 is an illustrative diagram of a portion of a battery showing its withdrawal into a metal terminal plate and its contact with a manganese dioxide-carbon compact; FIG.
The figure is a perspective view of the metal terminal plate of the battery shown in FIG. 1. 1... Container, 2... Surface, 3... Positive electrode made of manganese dioxide-carbon compressed body, 4... Separation diaphragm, 5... Negative electrode made of powdered zinc in alkaline electrolyte, 6, 7... Metal terminal. Board, 8...Container 1
bottom, 9...knob, 10...blocking ring, 11...inward bending flap.

Claims (1)

[Claims] 1. A container 1, an alkaline electrolyte contained in the container 1, a negative electrode 5 made of zinc in the alkaline electrolyte, and a compressed manganese dioxide-carbon provided above the negative electrode 5. a positive electrode 3 consisting of a body, arranged inside and outside the bottom 8 of the container 1, respectively;
In a battery in which a plurality of single batteries made up of connected metal terminal plates 6 and 7 are stacked and connected together along the periphery of the container 1, the positive electrode 3 made of the compressed manganese dioxide-carbon body is connected to the metal terminal. A battery characterized in that it is configured to be fixed by being clamped by a flap bent downward along the edge of the plate 6. 2. The battery according to claim 1, wherein the metal terminal plate 6 is provided with flaps bent inwardly by slightly more than 90 degrees along the two opposing edges thereof. 3. The battery according to claim 2, wherein two opposing edges of the metal terminal plate 6 are provided with flaps bent inward by 1 to 3 degrees from 90 degrees along these edges. 4. Claim 1, wherein the lower end of the flap is provided with an inwardly bent flap 11 bent inwardly by about 90 degrees.
The battery according to any one of items 2 and 3. 5. The battery according to claim 1, wherein the manganese dioxide-carbon compressed body 3 is slightly smaller than the metal terminal plate 6 and has rounded corners. 6. The battery according to claim 5, wherein the compressed manganese dioxide-carbon body 3 is 0.06 to 0.08 mm smaller than the metal terminal plate 6.