# US 10,307,925 B2 · Method for producing separator and method for slitting separator original sheet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,307,925 B2 - Document ID: US10307925B2 - Status: Granted - Kind: B2 - Application number: 15/897,281 - Filed: 2018-02-15 - Published: 2018-06-21 - Granted: 2019-06-04 - Earliest claimed: 2014-12-25 - Assignees: Sumitomo Chemical Company, Limited - Applicants: Sumitomo Chemical Company, Limited - Inventors: Koichiro Watanabe; Tatsuya Kataoka; Kiyomu Nomura - Web page: https://patentgrep.com/patent/US10307925B2 ## CPC - B26D 1/025: {for thin material, e.g. for sheets, strips or the like} - B26D 1/02: having a stationary cutting member (B26D1/547 takes precedence) - B26D 1/03: with a plurality of cutting members - B26D 1/035: {for thin material, e.g. for sheets, strips or the like} - B26D 3/00: Cutting work characterised by the nature of the cut made; Apparatus therefor - B26D 7/18: Means for removing cut-out material or waste - B26D 7/2614: {Means for mounting the cutting member} - B65H 18/021: {Multiple web roll supports} - B65H 35/02: from or with longitudinal slitters or perforators - H01M 50/406: Moulding; Embossing; Cutting - B65H 2301/41282: coaxially arranged - B65H 2301/4148: slitting - B65H 2801/72: Fuel cell manufacture - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - Y02E 60/10: Energy storage using batteries - B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04) - B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## 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). ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The method as set forth in claim 1, wherein: in the step (b), the separator original sheet is slit by a slitting blade provided on a side of the separator original sheet which side is opposite to a side on which the roller is provided; and the roller has a groove at a position corresponding to the slitting blade. ### Claim 3 (depends on 1) The method as set forth in claim 1, wherein one or more of the plurality of separators and another one or more of the plurality of separators are separated in respective different directions. ### Claim 4 (depends on 1) The method as set forth in claim 1, wherein one or more of the plurality of separators and another one or more of the plurality of separators are separated on a downstream side of the position at which the separator original sheet is slit in the step (b). ### Claim 5 (depends on 3) The method as set forth in claim 3, wherein at least another roller is provided between (i) a position at which the one or more of the plurality of separators and the another one or more of the plurality of separators are separated and (ii) the position at which the separator original sheet is slit in the step (b). ### Claim 6 (depends on 4) The method as set forth in claim 4, wherein the one or more of the plurality of separators and the another one or more of the plurality of separators are separated on the roller. ### Claim 7 (depends on 3) The method as set forth in claim 3, wherein the one or more of the plurality of separators and the another one or more of the plurality of separators are separated upward and downward, respectively, and wound up by respective first and second rolling sections which are provided one above the other. ### Claim 8 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 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, a heat-resistant layer being formed on one surface of the separator original sheet, and in the step (b), the one surface of the separator original sheet being in contact with the roller, and the separator original sheet being slit by a slitting blade provided on a side of the other surface of the separator original sheet on which surface no heat-resistant layer is formed. ### Claim 9 A method for slitting, in a direction in which a separator original sheet being porous is conveyed, the separator original sheet into a plurality of separators each for use in a lithium-ion secondary battery, 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.