JPH0546058B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a lithium electrode manufacturing apparatus,
The purpose of the present invention is to provide a lithium electrode manufacturing device that can prevent failures due to lithium adhesion and can operate smoothly and continuously.

In conventional devices of this type, all parts that come into direct contact with lithium, except for the punch, were made of polytetrafluoroethylene. This is because polytetrafluoroethylene is non-stick. However, in reality, if used continuously for a long time, or if contact with strong pressure or slipping occurs, lithium will adhere to the polytetrafluoroethylene surface, making it unusable in some cases.
The equipment had to be shut down and the lithium deposits removed.

The present invention solves the above-mentioned drawbacks of the prior art.In an apparatus for manufacturing a lithium electrode by punching a lithium sheet, parts other than the punch that come into direct contact with lithium are made of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more. The purpose was achieved by forming the

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the device of the present invention.
1 is a cradle for punching lithium, and 2 is a punch for punching lithium, and this punch 2 can be moved up and down by a vertically movable plate 3. 4 is a fixing plate that pushes down the lithium sheet 5 that rises with the punch 1 after punching lithium; 6 is a knockout pin for pushing out the punched lithium from the punch 2; It can be moved up and down by a vertically movable plate 7. And 6
a is the tip of the knockout pin.

8 is a delivery roller around which the lithium sheet 5 for manufacturing lithium electrodes is wound;
10 is a guide roller, 11 is a take-up roller, and 12 is a take-up roller for the scrap sheet after punching the lithium electrode. In addition, 13 is punch 2
14 is a base.

The production of lithium electrodes using this apparatus is carried out as shown below.

The lithium sheet 5 sent out from the delivery roller 8 passes through a guide roller 9 and is punched into a predetermined shape by the punch 2 between the pedestal 1 and the fixed plate 4. During this lithium punching with punch 2,
The take-off roller 11 stops taking off the lithium sheet 5. The lithium sheet 5 that rises with the punch 2 after punching out the lithium is pushed down by the fixing plate 4. The elevated punch 2 moves to the front or rear side of the drawing, where the knockout pin 6 descends and removes the lithium electrode (referring to the lithium punched out by the punch 2) inside the punch 2.
is pushed out of the punch 2, and after being pushed out, the knockout pin 9 rises and the punch 2 returns to its original position.

The scrap sheet after punching is guided by guide roller 1.
0, through the take-up roller 11 to the take-up roller 12
is wound up.

In the above device, the parts that come into direct contact with lithium are the pedestal 1, the punch 2, the fixing plate 4, the tip 6a of the knockout pin 6, the guide rollers 9, 10,
The take-up roller 11, except for the punch 2, is made of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more.

The device of the present invention having the above structure and the conventional device (that is, the pedestal 1, the fixing plate 4, the tip 6a of the knockout pin 6, the guide rollers 9, 10, and the take-up roller 11 are made of polytetrafluoroethylene. When a lithium electrode with a thickness of 1 mm and a diameter of 20 mm was manufactured using the device of the present invention,
It was possible to continuously manufacture more than 100,000 pieces, but with conventional equipment, it was necessary to remove the lithium adhering to parts made of polytetrafluoroethylene, such as the pedestal, after producing 10,000 pieces.

In addition, in the device of the present invention, the ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more used as a material for forming parts that come into direct contact with lithium, excluding the punch, is, for example, manufactured by Sakushin Kogyo Co., Ltd. in the form of a molded product. It is commercially available under the trade name of "New Light", and the product used in the above-mentioned apparatus of the present invention is also this "New Light".

In the device illustrated in the embodiment, the take-up roller 11,
Although it has guide rollers 9 and 10, it is possible to manufacture lithium electrodes without using these rollers by providing the take-up roller 12 with a take-up function and by considering the arrangement of the devices. . Therefore, in a device that does not use such a take-up roller 11 and guide rollers 9 and 10, the pedestal 1, the fixing plate 4, and the tip 6a of the knockout pin 6 are made of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more. do it.

In addition, in the example, the entire part that comes into direct contact with lithium was made of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more, but the point is that if only the part that comes into direct contact with lithium is non-adhesive, the objective can be achieved. , even if the entire part is not made of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more as in the example, the surface portion of the parts that comes into direct contact with lithium may be coated with the above-mentioned specific ultra-high molecular weight polyethylene, or A sheet made of the ultra-high molecular weight polyethylene may be attached.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the lithium electrode manufacturing apparatus of the present invention. 1... pedestal, 2... punch, 4... fixed plate, 5
...Lithium sheet, 6...Knockout pin,
6a...Tip of knockout pin, 9, 10...
...Guide roller, 11...Take-up roller.

Claims (1)

[Claims] 1. An apparatus for producing a lithium electrode by punching a lithium sheet, characterized in that, except for the punch, all parts that come into direct contact with lithium are made of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more. Lithium electrode manufacturing equipment. 2. Parts made of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more serve as a pedestal for punching lithium, a fixing plate that presses down the lithium sheet that rises as the lithium is punched after punching, and a lithium electrode. The apparatus for manufacturing a lithium electrode according to claim 1, which is a tip of a knockout pin for pushing out from a punch. 3. Parts formed of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million or more are the pedestal, the fixed plate,
2. The apparatus for manufacturing a lithium electrode according to claim 1, which comprises a tip of the knockout pin, a guide roller for the lithium sheet, and a take-up roller for the lithium sheet.