US 10,307,925 B2Granted

Method for producing separator and method for slitting separator original sheet

AssigneeSumitomo Chemical Company, Limited

InventorsKoichiro Watanabe, Tatsuya Kataoka, Kiyomu Nomura

Life of this patent

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Abstract

Provided is a method for producing a separator which method less causes a tear in the separator. The method is a method for producing a separator by slitting, in a direction in which a separator original sheet (12b) being porous is conveyed, the separator original sheet (12b) into a plurality of separators (12a), including the steps of: (a) conveying the separator original sheet (12b) in a state where the separator original sheet (12b) is in contact with a roller (77); and (b) slitting the separator original sheet (12b) at a portion where the separator original sheet (12b) is in contact with the roller (77).

Claims9

Dependent claims

A method for producing a separator for use in a lithium-ion secondary battery by slitting, in a direction in which a separator original sheet being porous is conveyed, the separator original sheet into a plurality of separators, the method comprising the steps of:

(a) conveying the separator original sheet in a state where the separator original sheet is in contact with a roller;
and
(b) slitting the separator original sheet at a portion where the separator original sheet is in contact with the roller,
in the step (b), the separator original sheet being slit at a position that is located on an end position side of a middle position on a circumferential surface of the roller which middle position corresponds to a midpoint of a straight line via which a start position, at which the separator original sheet starts to be wound on the roller, and an end position, at which winding of the plurality of separators on the roll ends, are connected to each other and that is located on an upstream side of the end position.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/897,281Filed 15 Feb 2018 · continuation
Priority: JP 2014-26359325 Dec 2014
Published: US 2018/0169881 A121 Jun 2018
Granted: 4 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

B26D 1/025
Having a stationary cutting member: for thin material, e.g. for sheets, strips or the like
B26D 1/02
Involving a cutting member which does not travel with the work: having a stationary cutting member
B26D 1/03
Having a stationary cutting member: with a plurality of cutting members
B26D 1/035
With a plurality of cutting members: for thin material, e.g. for sheets, strips or the like

Family

PCT/JP2015/065009Parent of this continuation · filed 26 May 2015
US 2018/0169881 A1Pre-grant publication · published 21 Jun 2018
Application14/780,570Parent of this continuation
US 9,931,756 B2Parent of this continuation
US 2016/0325446 A1Published application
US 10,307,925 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

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