JPH023253Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a metal container in a cylindrical battery such as LR14 type or LR20 type.

As is well known, in a typical cylindrical alkaline battery, the power generation element is housed in a so-called bottomed cylindrical metal container with one end closed, and the opening side of this container is sealed with a metal seal via an insulating gasket. It is sealed with a plate. The metal container and the metal sealing plate each serve as both electrode terminals of the battery, and for example, the metal container is also called an anode can, the metal sealing plate is also called a cathode terminal plate, etc. Further, an exterior body such as a metal jacket is attached to the outer periphery of the metal container via a suitable insulator.

In conventional cylindrical batteries of this type, the closed end portion of the metal container has two shapes: a flat structure as shown in FIG. 1A, and a stepped structure as shown in FIG. 1B.
It is broadly divided into species. In flat structure, metal container 1
The closed end surface 20 of No. 0 only has a cylindrical center protrusion 21 serving as a terminal portion at its center, and the other portions are flat. In the stepped structure, the periphery of the cylindrical central protrusion 21 of the closed end surface 20 is stepped with two flat portions 22 and 23 having steps.

The conventional metal container 10 having such a structure had a drawback of poor impact resistance when completed as a battery. The center protrusion 21 of the metal container 10 is an important part that becomes the terminal of one pole, and when the battery is installed in the holder, the center protrusion 21 is attached to the entire battery so that the center protrusion 21 will surely contact the terminal on the holder side. The shape and dimensional accuracy of the portion occupied by the central protrusion 21 must be kept sufficiently high. However, in the conventional type, when a large impact or pressure is applied to the central protrusion 21 side of the metal container 10 by dropping the battery, the closed end surface 20 is relatively easily deformed, and this deformation damages the entire battery. Occupying central protrusion 2
The shape and dimensions of 1 tended to be subject to considerable deviations. This is because, in any of the structures shown in FIG. 1, the peripheral portion of the central protrusion 21 on the closed end surface 20 is a flat surface. In this structure, a force applied from the outside to the central protrusion 21 acts almost perpendicularly to the flat surface, so that the flat surface is easily deformed and the central protrusion 21 is likely to collapse.

This drawback is particularly noticeable in the case of cylindrical batteries, such as the LR14 type and LR20 type, which have a large battery size and therefore a large weight, because the impact when dropped is large.

This idea was devised in view of the conventional problems mentioned above, and its purpose was to increase the mechanical strength and impact resistance of the closed end face of the metal container of a cylindrical battery, and to improve the shape of the central protrusion that becomes the terminal part. - The aim is to make it difficult for dimensional deviations to occur.

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

FIG. 2 shows a metal container 10 for a cylindrical battery according to this invention. The shape of the closed end surface 20 of the metal container 10 includes a cylindrical center protrusion 21 that serves as a terminal portion located on the axis of the cylinder, a cone-shaped inclined part 24 continuous to the outside of the periphery of this central protrusion 21, and this inclined part. 24 and an annular convex portion 25 located on the peripheral edge thereof. The inclination angle R of the cone-shaped inclined portion 24 is set within a range of 15 to 30 degrees with respect to a plane perpendicular to the cylinder axis. Further, a flat surface extends to a certain extent outside the annular convex portion 25,
It is connected to the peripheral surface of the metal container 10.

FIG. 3 shows a metal container 10 constructed as described above.
This shows a cylindrical alkaline battery using a cylindrical alkaline battery. A power generation element consisting of an anode 31, a separator 32, a cathode 33, and a current collector rod 34 is housed in the metal container 10 having the above-described structure, and a metal sealing plate 36 is attached to the opening side of the metal container 10 via a gasket 35. , the inside of the container is now sealed. In addition, metal container 1
An insulating cylindrical body 38 is attached to the outer periphery of 0, and a metal jacket 39 is further attached to the outside thereof.

In this battery, the central protrusion 21 of the metal container 10 is the anode terminal, and the metal sealing plate 36 is the cathode terminal.

In the above configuration, when the battery is dropped or the like, an impact force applied from the outside to the central protrusion 21 is transmitted to the cone-shaped inclined portion 24. Inclined part 24
is formed to be inclined at an angle of 15 to 30 degrees, so the direction of the force applied to it is not perpendicular to this plane, and the component force perpendicular to the plane of the inclined part 24 is small, The component force parallel to the plane increases. In other words, the inclined portion 24 resists the force applied from the center protrusion 21 side.
The mechanical strength of this part is very high, and deformation of this part is difficult to occur. Further, since the annular convex portion 25 is formed on the peripheral edge of the inclined portion 24, the force applied to the inclined portion 24 is absorbed by the convex portion 25, making it more difficult for these portions to deform. In other words, the impact resistance of the closed end surface 20 is improved, and the shape and dimensions of the central protrusion 21 (anode terminal) are less likely to be distorted.

As described above in detail, according to the metal container for the cylindrical battery of this invention, the impact resistance of the battery is improved and the terminal portion is less likely to be deformed.

[Brief explanation of the drawing]

Figures 1A and B are diagrams showing the shape of a conventional metal container, Figure 2 is a diagram showing the shape of a metal container according to an embodiment of this invention, and Figure 3 is a cylindrical shape using the metal container of Figure 2. FIG. 2 is a cross-sectional view of a shaped alkaline battery. 10...metal container, 20...closed end surface, 21...
...Cylindrical central projection, 24...Cone-shaped inclined part, 25
...An annular convex portion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cylindrical metal container with one end closed that houses a power generating element and also serves as a terminal for one pole, the shape of the closed end portion being located on the axis of the cylinder. a cylindrical central protrusion that serves as a terminal, a cone-shaped inclined part continuous to the outside of the periphery of the central protrusion, and an annular convex part located between the periphery of this inclined part and the circumferential surface of the metal container. A metal container for a cylindrical battery, characterized by comprising: (2) The metal of the cylindrical battery according to claim 1, wherein the cone-shaped inclined portion forms an angle of 15 to 30 degrees with respect to a plane perpendicular to the cylinder axis. container.