Core, separator roll, and method for producing separator roll

Patent metadata

Field	Value
Publication number	US-10069125-B2
Application number	US-201615347243-A
Country	US
Kind code	B2
Filing date	Nov 9, 2016
Priority date	Feb 24, 2016
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A core prevents a battery separator wound therearound from moving and becoming misaligned on an outer circumferential surface of the core in a widthwise direction of the core. The core allows a separator to be wound around the outer circumferential surface thereof and is made of resin. The core includes a groove formed on the outer circumferential surface thereof, the groove extending in a direction substantially equivalent to a circumferential direction of the outer circumferential surface.

First claim

The invention claimed is:

1. A core for allowing a battery separator to be wound around an outer circumferential surface thereof, comprising:
a groove being formed on the outer circumferential surface so as to extend in a direction substantially equivalent to a circumferential direction of the outer circumferential surface,
wherein the groove comprises at least two groove portions formed on the outer circumferential surface of the core, wherein each groove portion has a peak when viewed in a cross-sectional view, and wherein an average distance between the peaks of two adjacent groove portions falls within a range from 50 μm to 500 μm,
the core being made of resin.

2. A separator roll comprising:
the core as set forth in claim 1 ; and
a battery separator wound around the outer circumferential surface of the core.

3. The core as set forth in claim 1 , wherein the average distance between the peaks is not greater than 250 μm.

4. The core as set forth in claim 1 , wherein the groove is formed in a spiral manner on the outer circumferential surface.

5. The separator roll as set forth in claim 2 , wherein a coefficient of static friction produced between the core and the battery separator and in a direction orthogonal to the circumferential direction falls in a range from 0.21 to 0.5.

6. A method for producing a separator roll, the method comprising the steps of:
(a) preparing a core such that a groove is formed on an outer circumferential surface of the core, the groove extending in a direction substantially equivalent to a circumferential direction of the outer circumferential surface; and
(b) winding a battery separator around the outer circumferential surface,
wherein the groove comprises at least two groove portions formed on the outer circumferential surface of the core, wherein each groove portion has a peak when viewed in a cross-sectional view, and wherein an average distance between the peaks of two adjacent groove portions falls within a range from 50 μm to 500 μm.

Assignees

• Sumitomo Chemical Co

Inventors

• Yashiki Daizaburo

Classifications

• B65H2701/5122

  Plastics · CPC title

• B65H19/28 Primary

  Attaching the leading end of the web to the replacement web-roll core or spindle (cores, formers, supports or holders, e.g. reels, with arrangements for securing ends of material B65H75/28) · CPC title

• H01M50/469

  tubular or cylindrical · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/406

  Moulding; Embossing; Cutting · CPC title