JPS6223429B2 - - Google Patents

Description

Detailed Description of the Invention The present invention involves putting a lithium metal material into a container and extruding it through a die to form a lithium columnar body, while press-fitting a current collector rod into the lithium columnar body to form a lithium cathode. The present invention relates to a method of manufacturing a lithium cathode body for batteries, and the method of the present invention will be explained below with reference to the drawings.

In the figure, 1 is a container, and this container 1
A liner 2 made of resin such as nylon, polypropylene, Delrin, or fluorine is fitted inside. 3 is a die, and a hole 4 is provided in the shape for extrusion molding. In this embodiment, a cross-shaped hole 4 is provided, but a Y-shaped hole 4,
There are also dies of various shapes that are provided with holes that match the cross section of the desired columnar body. Further, the surface of the die 3 is coated with a resin such as nylon like the liner 2, or the die 3 itself is made of a resin such as nylon. This is to prevent lithium from sticking to the liner 2 and die 3. The die 3 is fixed to the container 1 by a die fixture 5.

A piston 6 pressurizes and pushes out the lithium metal material 7 placed in the container 1, and is connected to a hydraulic cylinder 9 via a rod 8. A gasket 10 made of resin such as nylon, like the liner 2, is attached to the tip of the piston 6 to prevent lithium from sticking. 11 is a chuck that holds the current collecting rod 12, 13 is a chuck 1
A pulley 14 attached to the pulley 1 is a belt that is stretched around the pulley 13 so that the chuck 11 can be rotated in accordance with the shape of the current collecting rod 12 by a motor (not shown). Furthermore, the chuck 11 is configured to be movable back and forth using a hydraulic cylinder or the like.

A cutter member 15 cuts the lithium columnar body 16 having a predetermined size.

In the apparatus configured as described above, in order to manufacture a lithium cathode body, the lithium metal material 7 is first introduced through the material input port 16 provided in the container 1 (see FIG. 3). Then, the chuck 11 holding the current collector rod 12 moves forward,
The current collecting rod 12 stops when its tip reaches a predetermined position in the hole 4 of the die 3 (see FIG. 4). In this state,
Operate the hydraulic cylinder 9 and move the piston 6 to about 1~
When the lithium metal body 7 is pressurized by advancing at 2 mm/sec, the molded lithium columnar body 17 is extruded from the hole 4 of the die 3. At this time, since the current collector rod 12 has been placed in advance at a position opposite to the hole 4 of the die 3, the lithium columnar body 17 is connected to the current collector rod 12.
It is formed by press-fitting (see Fig. 5). At this time, if the shape of the current collector rod 12 is, for example, a threaded groove cut into the current collector rod 12, the chuck 11
rotates to facilitate press-fitting of the current collector rod 12.

Then, when the lithium columnar body 17 into which the current collector rod 12 is press-fitted is pushed out to a predetermined size, the cutter member 15 descends and cuts the lithium columnar body 17 (see FIG. 6). Then, the chuck 11 holding the cut lithium columnar body 17, that is, the lithium cathode body 17, retreats (see FIG. 7). Thereafter, the lithium cathode body 17 may be removed from the chuck 11.

As explained above, according to the present invention, when extruding a lithium columnar body from a lithium metal material, a current collector rod can be press-fitted while extruding lithium, so that it takes less time to manufacture a lithium cathode body. The process can be extremely shortened and mass production can be achieved, and there is no need to worry about deformation or buckling of the lithium column, which tends to occur when a current collector rod is press-fitted into the lithium column, which has great practical effects.

[Brief explanation of the drawing]

The drawings are for explaining the method of the present invention.
Fig. 1 is a schematic side view of the apparatus used in the method of the present invention, Fig. 2 is a perspective view showing a state in which a lithium columnar body is extruded while press-fitting a current collector rod, and Figs. FIG. 3 is a cross-sectional view showing the steps of the invention method. 1... Container, 3... Dice, 6... Piston, 7... Lithium metal body, 11... Chack, 12... Current collector rod, 17... Lithium columnar body.

Claims (1)

[Claims] 1 A lithium columnar body is produced by placing a lithium metal material into a container having a die fixed at one end for shaping the cross section of the molding material into a predetermined shape and extruding it from the die. A current collector rod is placed in advance at the opposite position from which the lithium columnar body is extruded, and while the lithium metal material is extruded and molded to form the lithium columnar body, the current collector rod is press-fitted into the lithium columnar body. A method for producing a lithium cathode body for a battery, the method comprising: producing a lithium cathode body for a battery by: