JPH043401Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention seals the opening of a cylindrical battery case with a bottom, together with a plastic sealing gasket.
The present invention also relates to an improvement of a sealing terminal plate for a dry battery, which is a component that serves as one terminal.

<<Prior Art>> A typical structure of a cylindrical alkaline battery is shown in FIG. 1 is a bottomed cylindrical metal battery case that also serves as a positive electrode terminal, and inside this is a well-known power generation element (positive electrode mixture 2, separator 3, gelled negative electrode 4).
is stored. The open end of the battery case 1 is closed with a plastic sealing gasket 5 and a dish-shaped negative electrode terminal plate 6. The negative electrode terminal plate 6 and the gelled negative electrode 4 are also electrically connected by a current collector 7 passing through the center of the sealing gasket 5.

The negative terminal plate 6 is a sealed terminal plate to which the present invention is applied. The negative electrode terminal plate 6 is a part made by pressing a metal plate, and includes a circular central flat plate part 6a, a skirt part 6b extending diagonally downward from the outer periphery of the central flat plate part 6a, and a skirt part 6b extending from the outer periphery of the lower end of the skirt part 6b. The skirt portion 6b has a raised outer circumferential standing portion 6c, and gas vent holes 6d are bored at appropriate positions in the skirt portion 6b.

The outer cylindrical part of the sealing gasket 5 is the battery case 1
The outer peripheral upright portion 6c of the negative electrode terminal plate 6 is fitted inside the outer peripheral cylindrical portion of the sealing gasket 5. The open end of the battery case 1 is bent inward by curling, and the outer circumferential cylindrical portion of the sealing gasket 5 is compressed between the case 1 and the outer circumferential upright portion 6c.

This structure seals the inside of the battery. When gas is generated inside the battery for some reason and the internal pressure becomes high, the thin wall portion of the sealing gasket 5 breaks and the internal gas escapes through the gas vent hole 6d. This prevents dangerous explosions.

<Problems to be Solved by the Invention> The following problems have conventionally occurred with respect to the negative terminal plate 6 described above.

In the process of manufacturing a battery, a large number of negative electrode terminal plates 6 having the above-described shape are stacked as shown in FIG. 3 and sent to a plating process or an assembly process. When stacked in this manner, the skirt portion 6b of the next component gets inside the skirt portion 6b of one component, and the components are pressed against each other due to their fitting. If the plating process is started with the parts still stuck together, the plating will be uneven, and it is also troublesome to separate the stuck parts one by one during assembly.

If the skirt portion 6b is made into a straight cylindrical portion instead of having a wide hem, the inner and outer peripheries of the straight cylindrical portion will pinch when a large number of parts are stacked on top of each other, and the parts will not touch each other due to fitting as described above. will disappear. However, in this case, the strength of the terminal board 6 is reduced. When the open end of the battery case 1 is curled inward, a considerably large force (force directed from the outside toward the center) is applied to the outer peripheral upright portion 6c of the negative electrode terminal plate 6 via the sealing gasket 5. The negative terminal plate 6 must have sufficient strength to withstand this force. If the skirt portion 6b is made into a straight cylindrical portion, the necessary strength will not be obtained, and the terminal plate 6 will be deformed during curling.

This idea was devised in view of the above-mentioned conventional problems, and its purpose is to prevent the above-mentioned sticking phenomenon caused by fitting even when a large number of sealed terminal plates (corresponding to the above-mentioned negative electrode terminal plate 6) are stacked. The objective is to prevent this from occurring and to maintain the strength required for the sealed terminal board.

<Means for solving the problem> The sealed terminal plate of a dry battery according to this invention includes a circular central flat plate part, a straight cylindrical part extending vertically from the outer periphery of the central flat plate part, and this straight cylindrical part. A skirt part that spreads diagonally downward from the lower end of the
This skirt part is integrally formed with an outer peripheral standing part rising from the lower end outer periphery of a metal plate, and the height of the straight cylindrical part is more than 1/2 of the overall height, and the skirt part It has a gas vent hole.

《Operation》 Since the straight cylindrical portion is provided, when a large number of the sealing terminal boards are stacked, the outer periphery of the straight cylindrical portion of one component and the inner periphery of the straight cylindrical portion of the other component can be pressed together, making it easy to fit. No pecking phenomenon occurs.

Further, since there is a skirt portion extending obliquely downward from the lower end of the straight cylindrical portion, the strength of the sealing terminal plate is maintained sufficiently large.

<<Embodiment>> FIG. 1 shows a sealed terminal plate for a dry battery according to an embodiment of this invention. This terminal plate is a new negative electrode terminal plate that replaces the negative electrode terminal plate 6 in the cylindrical alkaline battery shown in FIG.

The sealing terminal plate shown in FIG. 1 is integrally formed by pressing a metal flat plate, and includes a circular central flat plate portion 11 and a straight cylindrical portion 12 extending perpendicularly from the outer periphery of the central flat plate portion 11. , straight cylinder part 12
Skirt part 13 that spreads diagonally downward from the lower end of
and an outer peripheral standing portion 14 rising from the outer periphery of the lower end of the skirt portion 13, the height B of the straight cylindrical portion 12 is set to be 1/2 or more of the overall height A, and the skirt portion 13 is provided with a gas vent. A hole 15 is bored.

In this embodiment, B/A is set to approximately 0.6. If there is a straight cylindrical portion 12, when a large number of terminal boards are stacked, the inner periphery of the straight cylindrical portion 12 of one component will be held against the outer periphery of the straight cylindrical portion 12 of the other component, so that they cannot be fitted as in the conventional case. This prevents the parts from sticking together. However, if the height B of the straight cylindrical portion 12 is too small, a pinching phenomenon may occur at the outer peripheral upright portion 14 due to fitting. Therefore, it is better to set B to 1/2 or more of A.

In addition, the terminal board is connected to the sealing gasket 5 in Fig. 2.
The outer peripheral upright portion 14 is fitted inside the outer peripheral cylindrical portion of the sealing gasket 5. Then, the upper end of the battery case 1 is curled inward, and the sealing gasket 5 is compressed between the battery case 1 and the outer peripheral upright portion 14. The terminal board is required to have sufficient strength to withstand this compressive force.

In the present invention, the straight cylindrical portion 12 and the outer circumferential standing portion 14 are connected by the tapered skirt portion 13, so that the necessary strength can be maintained sufficiently.

Further, although the gas vent hole 15 is provided in the skirt portion 13, the sealant is less likely to leak out in the present invention than in the case where this hole is provided in the straight cylinder portion 12.

<<Effects of the invention>> As explained in detail above, the sealed terminal board for dry batteries according to this invention maintains sufficient strength to withstand the force of curling (caulking) of the battery case, while maintaining sufficient strength.
It is possible to eliminate the inconvenience that when a large number of terminal boards are stacked in the state of parts, the unevenness of the terminal boards fit into each other and cause them to stick together, and the workability of battery assembly becomes better than before.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a sealed terminal plate according to an embodiment of this invention, Figure 2 is a cross-sectional view of a cylindrical alkaline battery using a conventional sealed terminal plate, and Figure 3 is a cross-sectional view of a cylindrical alkaline battery using a conventional sealed terminal plate. It is a sectional view of a state. DESCRIPTION OF SYMBOLS 1... Battery case, 2... Positive electrode mixture, 3... Separator, 4... Gel-like negative electrode, 5... Sealing gasket, 6... Negative terminal plate (conventional), 7... Current collector,
11...Central flat plate part, 12...Straight cylinder part,
13...Skirt portion, 14...Outer standing portion, 15
...Gas vent hole.

Claims (1)

[Scope of utility model registration request] A circular central flat plate part, a straight cylinder part rising vertically from the outer periphery of the central flat plate part, a skirt part extending diagonally downward from the lower end of the straight cylinder part, and a skirt part rising from the outer periphery of the lower end of the skirt part. A raised outer circumferential standing portion is integrally formed with a metal plate, the height of the straight cylinder portion is 1/2 or more of the overall height, and a gas vent hole is bored in the skirt portion. A dry cell sealed terminal board featuring: