Separator core and separator roll

Patent metadata

Field	Value
Publication number	US-10301147-B2
Application number	US-201715637404-A
Country	US
Kind code	B2
Filing date	Jun 29, 2017
Priority date	Jun 30, 2016
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

The present invention achieves a separator core that is easy to clean and that will have no or few remaining foreign substances and a separator roll obtained by winding a separator around the separator core. Provided is a separator core around which a separator is wound or is to be wound, in which at least one of (i) a connection between a surface of a support part and the inner peripheral surface of the outer cylindrical part and (ii) a connection between the surface of the support part and the outer peripheral surface of the inner cylindrical part is made smoothly by a curved face.

First claim

The invention claimed is:

1. A separator core around which a separator for a nonaqueous electrolyte secondary battery is wound or is to be wound, comprising:
an outer cylindrical part;
an inner cylindrical part provided inside the outer cylindrical part; and
support parts that are provided between the outer cylindrical part and the inner cylindrical part and that extend in radial directions to connect to the outer cylindrical part and the inner cylindrical part,
wherein at least one of (i) a connection between a surface of at least one of the support parts and an inner peripheral surface of the outer cylindrical part and (ii) a connection between the surface of the at least one of the support parts and an outer peripheral surface of the inner cylindrical part is made smoothly by a curved face.

2. The separator core according to claim 1 , wherein the curved face has a shape of part of a curved surface of a cylinder.

3. The separator core according to claim 1 , wherein the curved face between the surface of the at least one of the support parts and the inner peripheral surface of the outer cylindrical part has a larger radius of curvature than the curved face between the surface of the at least one of the support parts and the outer peripheral surface of the inner cylindrical part.

4. The separator core according to claim 1 , wherein the curved face between the surface of the at least one of the support parts and the inner peripheral surface of the outer cylindrical part has a radius of curvature of 2.5 mm or greater.

5. The separator core according to claim 1 , wherein the curved face between the surface of the at least one of the support parts and the outer peripheral surface of the inner cylindrical part has a radius of curvature of 2 mm or greater.

6. The separator core according to claim 1 , which is made from a material containing an ABS resin, a polyethylene resin, a polypropylene resin, a polystyrene resin, a polyester resin, and/or a vinyl chloride resin.

7. A separator roll comprising:
the separator core as set forth in claim 1 ; and
a separator for a nonaqueous electrolyte secondary battery wound around the separator core.

8. The separator roll according to claim 7 , wherein the separator comprises a porous film and a heat-resistant layer.

9. The separator roll according to claim 8 , wherein the heat-resistant layer contains a wholly aromatic polyamide.

10. The separator roll according to claim 9 , wherein the separator further comprises an adhesive layer.

11. The separator roll according to claim 8 , wherein the separator further comprises an adhesive layer.

12. The separator roll according to claim 7 , wherein the separator comprises a porous film and an adhesive layer.

Assignees

• Sumitomo Chemical Co

Inventors

• Tsukuda Yosuke
• Yashiki Daizaburo

Classifications

• H01M50/423

  Polyamide resins · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• B65H2701/52

  Integration of elements inside the core or reel · CPC title

• H01M8/0289

  Means for holding the electrolyte (solid polymer electrolytes H01M8/1018) · CPC title