JPH0368528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing electrodes of electric double layer capacitors having a flat coin shape.

[Conventional example]

An electric double layer capacitor has two metal case members that are combined with each other, namely a dish-shaped case body and a cap that is placed over this case body. During manufacture, the bottoms of the case body and the cap are first coated with conductive material. Sheet electrodes are attached to each via an adhesive. Next, an electrolytic solution is injected into the case body and the cap, and the sheet-like electrodes are impregnated with the electrolytic solution, and a separator is placed between each electrode. Thereafter, a gasket is placed around the inner periphery of the case body, a cap is placed over the case body, and the periphery of the cap is caulked to create a coin cell with a predetermined capacity.

[Problem that the invention seeks to solve]

By the way, referring to FIG. 3, the sheet-like electrode 1 is made of, for example, activated carbon, carbon, and polytetrafluoroethylene (PTFE) as a binder.
An electrode base material is obtained by kneading the electrode base material, and a circular shape is punched out from a sheet 2 obtained by rolling the electrode base material to a predetermined thickness. Therefore, the yield rate is poor, which ultimately leads to an increase in costs. Note that it is said that the material remaining after punching out the sheet electrode 1 cannot be reused in practice because it is extremely difficult to adjust the material to a predetermined density.

[Means for solving problems]

In order to solve the above-mentioned conventional problems, in the present invention, an electrode base material made by kneading carbon, activated carbon, a predetermined binder, etc. is continuously extruded into a rod shape from an extrusion nozzle, and the rod-shaped body is cut into a cutter. A sheet-like electrode is obtained by cutting the electrode into a predetermined thickness along a direction perpendicular to the axis using a cutting means such as the above.

[Effect]

According to the above method, the rod-shaped electrode base material is cut into rounds, so that sheet-shaped electrodes can be obtained with almost no processing loss.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2.

As shown in FIG. 1, an extrusion nozzle 10 is used in the present invention. This extrusion nozzle 10 may be of a known type, and a plunger 10a is fitted inside it.

To obtain a sheet-like electrode, a predetermined amount of electrode base material 11 is packed into extrusion nozzle 10 . Note that the electrode base material 11 is made of activated carbon, for example, as in the conventional case.
Consists of a mixture of carbon and PTFE.
By operating the plunger 10a, a rod-shaped body 11a having, for example, a circular cross section is continuously extruded from the nozzle 10. A cutter 12 is provided on the discharge side of the nozzle 10. This cutter 12 is driven in a direction perpendicular to the axis of the rod-shaped body 11a. Therefore, by the cutting operation of the cutter 12, the sheet-like electrode 13 having a predetermined thickness is cut off from the rod-like body 11a.

Note that by synchronizing the cutting operation with the transporting operation of the case member (dish-shaped case body) 14, the sheet-like electrode 13 can be automatically set in the case member 14. That is, the case member 14 at the dispenser 15
After applying the conductive adhesive 16 to the bottom of the case member 14, the case member 14 is moved below the extrusion nozzle 10. Next, when the cutter 12 is operated, the sheet electrode 13 is cut off from the rod 11a and falls into the case member 14 waiting below. Then, the sheet electrode 13 is retracted to a predetermined position and pressed by the press rod 17. In this way, the production of the sheet-like electrode 13 and the insertion into the case member 14 are automatically performed without waste.

FIG. 2 shows a modification of the above embodiment, in which the cutter 12
After cutting off the sheet-like electrode 13 from the rod-like body 11a, the sheet-like electrode 13 is processed into a ball shape using, for example, a rotating disk 18, the ball 13a is put into the case member 14, and the press rod 17
I try to flatten it by pressing it.

〔Effect of the invention〕

As explained above, according to the present invention, a sheet-like electrode can be manufactured from the electrode base material with almost no processing loss, resulting in great cost benefits.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining the present invention, FIG. 2 is a schematic diagram showing a modification of FIG. 1, and FIG. 3 is an explanatory diagram for explaining a conventional example. In the figure, 10 is an extrusion nozzle, 11 is an electrode base material,
11a is a rod-shaped body, 12 is a cutter, 13 is a sheet-like electrode, and 14 is a case member.

Claims (1)

[Claims] 1. A method for manufacturing an electrode to be attached to the bottom of a metal case member formed in a dish shape via a conductive adhesive, comprising: an electrode made by kneading carbon, activated carbon, a predetermined binder, etc. A sheet-like electrode is obtained by continuously extruding a base material into a rod shape from an extrusion nozzle, and cutting the rod-like body into a predetermined thickness along a direction perpendicular to its axis using a cutting means such as a cutter. A method for manufacturing electrodes for electric double layer capacitors.