US 8,202,646 B2 · Battery can with cutting-edge portion higher than cutting start portion, manufacturing method and manufacturing device therefore, and battery using the same

Abstract

A battery case is made by cutting from a blank case of a bottomed cylindrical battery case having an unwanted portion at an opening portion the unwanted portion from the case wall in the circumferential direction by a blade. The cutting of the case wall is performed so as to render a cutting-end portion higher than a cutting-start portion. Thus, re-cutting of the cutting-start portion by the blade after it has already completed one rotation can be avoided. As a result, the generation of thread-like chips from re-cutting of the cut surface can be avoided.

Claims14

Dependent claims

A battery case made by cutting away an unwanted portion from a blank case of a bottomed cylindrical battery case having the unwanted portion at an opening portion,

wherein a cutting-end portion is closer to the opening portion of the blank case than a cutting-start portion in a cut surface formed by cutting a case wall of said blank case in a circumferential direction so as to cut off said unwanted portion.

A device for manufacturing a battery case by cutting away an unwanted portion from a blank case of a bottomed cylindrical battery case having the unwanted portion at an opening portion, the device comprising:

a blank case supporting means that supports said blank case rotatably;
a circular internal blade that abuts a case wall of said blank case from inside;
an internal blade supporting means that supports the internal blade rotatably;
an arc-shaped external blade that abuts the case wall of said blank case from outside so as to overlap said internal blade with a predetermined clearance in therebetween;
and
an external blade supporting means that rotatably supports the external blade;
wherein said external blade is shaped so that in a cut surface formed by cutting the case wall of said blank case in a circumferential direction with said internal blade and said external blade, a cutting-end portion is closer to the opening portion of the blank case than a cutting-start portion.

4 more elements

Dependencies are inferred from the claim text.

Battery can with cutting-edge portion higher than cutting start portion, manufacturing method and manufacturing device therefore, and battery using the same

Life of this patent

Battery can with cutting-edge portion higher than cutting start portion, manufacturing method and manufacturing device therefore, and battery using the same

Life of this patent

Abstract

Claims14