WO2016104507A1 - スリットセパレータの製造方法及びセパレータ捲回体の製造方法 - Google Patents
スリットセパレータの製造方法及びセパレータ捲回体の製造方法 Download PDFInfo
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- WO2016104507A1 WO2016104507A1 PCT/JP2015/085842 JP2015085842W WO2016104507A1 WO 2016104507 A1 WO2016104507 A1 WO 2016104507A1 JP 2015085842 W JP2015085842 W JP 2015085842W WO 2016104507 A1 WO2016104507 A1 WO 2016104507A1
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- slit
- separator
- blade
- angle
- battery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/02—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
- B26D1/025—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member for thin material, e.g. for sheets, strips or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/02—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/02—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
- B26D1/03—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member with a plurality of cutting members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/02—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
- B26D1/03—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member with a plurality of cutting members
- B26D1/035—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member with a plurality of cutting members for thin material, e.g. for sheets, strips or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
- B26D1/143—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a stationary axis
- B26D1/15—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a stationary axis with vertical cutting member
- B26D1/151—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a stationary axis with vertical cutting member for thin material, e.g. for sheets, strips or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
- B26D1/24—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with another disc cutter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
- B26D1/24—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with another disc cutter
- B26D1/245—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with another disc cutter for thin material, e.g. for sheets, strips or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
- B26D7/2614—Means for mounting the cutting member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H18/00—Winding webs
- B65H18/02—Supporting web roll
- B65H18/021—Multiple web roll supports
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
- B65H35/02—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with longitudinal slitters or perforators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
- H01M50/406—Moulding; Embossing; Cutting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/423—Polyamide resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/41—Winding, unwinding
- B65H2301/412—Roll
- B65H2301/4128—Multiple rolls
- B65H2301/41282—Multiple rolls coaxially arranged
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a method for producing a porous slit separator used in a battery such as a lithium ion secondary battery, a method for producing a separator winding body using this production method, a method for slitting a separator, and a separator slit device.
- the battery separator needs to be manufactured to have a width suitable for a battery manufactured using the separator (hereinafter referred to as “product width”).
- product width a width suitable for a battery manufactured using the separator.
- manufacturing a separator having a product width from the beginning is not efficient. Therefore, it is common to produce a plurality of separators having a product width at the same time by creating a wide separator original and slitting it.
- Patent Document 1 discloses a spot-type carbon dioxide laser cutting device as a device for slitting a separator. Patent Document 1 describes using a carbon dioxide laser oscillation unit and a mirror that bends laser light (paragraph [0050]).
- Patent Document 2 discloses a configuration in which the angle between the razor blade and the separator and the thickness of the separator have a predetermined relationship as a method of slitting the separator. Patent Document 1 describes that this configuration makes it difficult for holes and tears to occur in the separator (paragraph [0030]).
- separator before being slit is referred to as “original fabric”.
- separator after being slit is referred to as a “slit separator”.
- Japanese Patent Publication Japanese Laid-Open Patent Publication No. 2013-119094
- Japanese Patent Publication Japanese Patent Publication “JP 2002-273684 A (published on September 25, 2002)”
- Patent Document 1 since the apparatus of Patent Document 1 needs to include a carbon dioxide laser oscillation unit and a mirror that bends the laser beam, it must be large. In particular, the mirror needs to be provided for each position where the original fabric is slit. Therefore, the use of this apparatus becomes more difficult as the number of slits in the original fabric increases.
- Patent Document 2 can be used relatively easily even when the number of slits in the original fabric increases.
- the angle between the razor blade and the separator and the thickness of the separator do not have a decisive influence on the quality of the slit separator. Therefore, a good slit separator is not obtained by this method.
- Patent Documents 1 and 2 do not disclose a configuration for obtaining a good slit separator using a plurality of slit blades.
- an object of the present invention is to provide a manufacturing method of a slit separator and a manufacturing method of a separator winding body that can obtain a high-quality slit separator and a separator winding body.
- a manufacturing method of a slit separator includes a transporting step of transporting a porous battery separator original, and contact with the battery separator original at a slit position. And a first slitting step of slitting the battery separator original by inserting a plurality of slit blades with respect to the battery separator original so that the angles of the plurality of slit blade edges in a plane are substantially the same.
- the manufacturing method of the separator winding body which concerns on the 2nd aspect of this invention includes each process in the manufacturing method of the above-mentioned slit separator, and the process of winding the slit separator around a core.
- FIG. 1 It is a schematic diagram which shows the cross-sectional structure of a lithium ion secondary battery. It is a schematic diagram which shows the detailed structure of the lithium ion secondary battery shown by FIG. It is a schematic diagram which shows the other structure of the lithium ion secondary battery shown by FIG. It is a schematic diagram which shows the structure of the slit apparatus which slits a separator. It is a side view and a front view which show the structure of the cutting device of the slit apparatus shown by FIG. It is a schematic diagram which shows the separator slit method of Embodiment 1. FIG. It is a front view and sectional drawing which show the structure of the slit blade utilized for the separator slit method shown by FIG.
- FIG. 8 It is a front view and sectional drawing which show the detailed structure of the slit blade shown by FIG. It is a schematic diagram which shows the relationship between the cross-sectional angle and attachment angle of a slit blade shown by FIG. 8, and a tangent plane blade edge angle. It is a front view which shows the structure of the slit blade utilized for the separator slit method of Embodiment 2.
- FIG. It is sectional drawing which shows the structure of the slit blade different from what is shown by FIG. It is a front view which shows the separator slit method different from the separator slit method using the slit blade shown by FIG.
- FIG. 1 It is a front view which shows the separator slit method further different from the separator slit method using the slit blade shown by FIG. It is sectional drawing when it sees from the side surface which shows the structure of the lower blade of a pair of slit blade utilized with the separator slit method shown by FIG. It is a figure for demonstrating the mode of the fuzz which generate
- Non-aqueous electrolyte secondary batteries represented by lithium ion secondary batteries have high energy density, and are therefore currently used for mobile devices such as personal computers, mobile phones, personal digital assistants, automobiles, airplanes, etc.
- a battery it is widely used as a stationary battery that contributes to the stable supply of electric power.
- FIG. 1 is a schematic diagram showing a cross-sectional configuration of a lithium ion secondary battery 1.
- the lithium ion secondary battery 1 includes a cathode 11, a separator 12, and an anode 13.
- An external device 2 is connected between the cathode 11 and the anode 13 outside the lithium ion secondary battery 1. Then, electrons move in the direction A when the lithium ion secondary battery 1 is charged, and in the direction B when the lithium ion secondary battery 1 is discharged.
- the separator 12 is disposed between the cathode 11 that is the positive electrode of the lithium ion secondary battery 1 and the anode 13 that is the negative electrode thereof so as to be sandwiched between them.
- the separator 12 is a porous film that allows lithium ions to move between the cathode 11 and the anode 13 while separating them.
- the separator 12 includes, for example, polyolefin such as polyethylene and polypropylene as its material.
- FIG. 2 is a schematic diagram showing a detailed configuration of the lithium ion secondary battery 1 shown in FIG. 1, where (a) shows a normal configuration, and (b) shows a temperature rise of the lithium ion secondary battery 1. (C) shows a state when the temperature of the lithium ion secondary battery 1 is rapidly increased.
- the separator 12 is provided with a large number of holes P.
- the lithium ions 3 of the lithium ion secondary battery 1 can come and go through the holes P.
- the lithium ion secondary battery 1 may be heated due to an overcharge of the lithium ion secondary battery 1 or a large current caused by a short circuit of an external device.
- the separator 12 is melted or softened, and the hole P is closed. Then, the separator 12 contracts. Thereby, since the movement of the lithium ion 3 stops, the above-mentioned temperature rise also stops.
- the separator 12 when the temperature of the lithium ion secondary battery 1 is rapidly increased, the separator 12 is rapidly contracted. In this case, as shown in FIG. 2C, the separator 12 may be broken. And since the lithium ion 3 leaks from the destroyed separator 12, the movement of the lithium ion 3 does not stop. Therefore, the temperature rise continues.
- FIG. 3 is a schematic diagram showing another configuration of the lithium ion secondary battery 1 shown in FIG. 1, where (a) shows a normal configuration, and (b) shows that the lithium ion secondary battery 1 is abruptly changed. The state when the temperature is raised is shown.
- the separator 12 may be a heat-resistant separator including a porous film 5 and a heat-resistant layer 4.
- the heat-resistant layer 4 is laminated on one surface of the porous film 5 on the cathode 11 side.
- the heat-resistant layer 4 may be laminated on one surface of the porous film 5 on the anode 13 side, or may be laminated on both surfaces of the porous film 5.
- the heat-resistant layer 4 is also provided with holes similar to the holes P. Usually, the lithium ions 3 come and go through the holes P and the holes of the heat-resistant layer 4.
- the heat resistant layer 4 includes, for example, wholly aromatic polyamide (aramid resin) as a material thereof.
- the heat-resistant layer 4 assists the porous film 5. Therefore, the shape of the porous film 5 is maintained. Therefore, the porous film 5 is melted or softened, and the holes P are only blocked. Thereby, since the movement of the lithium ion 3 is stopped, the above-described overdischarge or overcharge is also stopped. Thus, destruction of the separator 12 is suppressed.
- the production of the heat-resistant separator of the lithium ion secondary battery 1 is not particularly limited, and can be performed using a known method.
- the porous film 5 mainly contains polyethylene as the material is assumed and demonstrated.
- the separator 12 can be manufactured by the same manufacturing process.
- a plasticizer is added to a thermoplastic resin to form a film, and then the plasticizer is removed with an appropriate solvent.
- a plasticizer is added to a thermoplastic resin to form a film, and then the plasticizer is removed with an appropriate solvent.
- the porous film 5 is formed from a polyethylene resin containing ultrahigh molecular weight polyethylene, it can be produced by the following method.
- This method includes (1) a kneading step of kneading ultrahigh molecular weight polyethylene and an inorganic filler such as calcium carbonate to obtain a polyethylene resin composition, and (2) a rolling step of forming a film using the polyethylene resin composition. (3) Removal step of removing the inorganic filler from the film obtained in the step (2), and (4) Stretching step of obtaining the porous film 5 by stretching the film obtained in the step (3). including.
- a large number of micropores are provided in the film by the removing process.
- the micropores of the film stretched by the stretching process become the above-described holes P.
- the porous film 5 which is a polyethylene microporous film having a predetermined thickness and air permeability is formed.
- 100 parts by weight of ultrahigh molecular weight polyethylene, 5 to 200 parts by weight of a low molecular weight polyolefin having a weight average molecular weight of 10,000 or less, and 100 to 400 parts by weight of an inorganic filler may be kneaded.
- the heat-resistant layer 4 is formed on the surface of the porous film 5 in the coating process.
- an aramid / NMP (N-methyl-pyrrolidone) solution (coating solution) is applied to the porous film 5 to form the heat-resistant layer 4 which is an aramid heat-resistant layer.
- the heat-resistant layer 4 may be provided only on one side of the porous film 5 or on both sides.
- the method for applying the coating solution to the porous film 5 is not particularly limited as long as it is a method that enables uniform wet coating, and a conventionally known method can be employed.
- a capillary coating method, a spin coating method, a slit die coating method, a spray coating method, a dip coating method, a roll coating method, a screen printing method, a flexographic printing method, a bar coater method, a gravure coater method, a die coater method, etc. Can do.
- the thickness of the heat-resistant layer 4 can be controlled by the thickness of the coating wet film and the solid content concentration in the coating solution.
- a resin film, a metal belt, a drum, or the like can be used as a support for fixing or transporting the porous film 5 during coating.
- the separator 12 heat resistant separator in which the heat resistant layer 4 is laminated on the porous film 5 can be manufactured.
- the manufactured separator is wound around a cylindrical core.
- the object manufactured with the above manufacturing method is not limited to a heat-resistant separator. This manufacturing method does not need to include a coating process.
- the object to be manufactured is a separator having no heat-resistant layer.
- the heat-resistant separator or the separator having no heat-resistant layer (hereinafter referred to as “separator”) preferably has a width (hereinafter referred to as “product width”) suitable for application products such as the lithium ion secondary battery 1.
- product width a width suitable for application products such as the lithium ion secondary battery 1.
- the separator is manufactured such that its width is equal to or greater than the product width. Once manufactured, the separator is cut (slit) to the product width.
- the “separator width” means the length of the separator in a direction perpendicular to the longitudinal direction and the thickness direction of the separator.
- the wide separator before being slit is referred to as “original fabric”, and the slit separator is particularly referred to as “slit separator”.
- the slit means that the separator is cut along the longitudinal direction (the film flow direction in manufacturing, MD: Machine direction), and the cut means that the separator is cut along the transverse direction (TD). Means to cut.
- the transverse direction (TD) means a direction that is substantially perpendicular to the longitudinal direction (MD) and the thickness direction of the separator.
- FIG. 4 is a schematic diagram showing the configuration of the slit device 6 for slitting the separator, where (a) shows the overall configuration, and (b) shows the configuration before and after slitting the original fabric.
- the slit device 6 includes a cylindrical unwinding roller 61, rollers 62 to 69, and a plurality of winding rollers 70U and 70L that are rotatably supported. .
- the slit device 6 is further provided with a cutting device 7 to be described later.
- a cylindrical core c around which an original fabric is wound is fitted on the unwinding roller 61.
- the original fabric is unwound from the core c to the path U or L.
- the unwinded original fabric is conveyed to the roller 68 via the rollers 63 to 67.
- the original fabric is slit into a plurality of separators.
- the roller 67 may not be provided. At this time, the original fabric is conveyed from the roller 64 to the roller 68.
- a part of the plurality of slit separators is wound around each cylindrical core u (bobbin) fitted to the winding roller 70U. Further, the other part of the plurality of slit separators is wound around each cylindrical core l (bobbin) fitted to the winding roller 70L. Note that an integrated body of the slit separator and the core u ⁇ l wound up in a roll shape is referred to as a “rolled body”.
- FIG. 5 is a diagram illustrating a configuration of the cutting device 7 of the slit device 6 illustrated in FIG. 4A, where FIG. 5A is a side view of the cutting device 7, and FIG. It is a front view.
- the cutting device 7 includes a holder 71 and a slit blade 72.
- the holder 71 is fixed to a housing or the like provided in the slit device 6.
- the holder 71 holds the slit blade 72 so that the positional relationship between the slit blade 72 and the separator raw material conveyed is fixed.
- the slit blade 72 slits the raw material of the separator with a sharp edge.
- ⁇ Separator slit method ⁇ (Division of the original fabric with a slit blade)
- 6A and 6B are schematic views showing the separator slit method of the present embodiment, in which FIG. 6A is a front view and FIG. 6B is a top view.
- the original fabric S is conveyed along a certain conveyance path to the cutting edge of the slit blade 72.
- the slit blade 72 slits the raw fabric S into a slit separator su and a slit separator sl.
- the slit separator su and the slit separator sl are conveyed in different directions.
- the original fabric S is conveyed in one direction D.
- the slit blade 72 is cut into the original fabric S parallel to the direction D and perpendicular to the original fabric S.
- the raw fabric S is a separator immediately before being slit by the slit blade 72.
- FIGS. 7A and 7B are views showing the configuration of the slit blade 72 used in the separator slitting method shown in FIGS. 6A to 6B, wherein FIG. 7A is a front view, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.
- the slit blade 72 includes a straight blade edge E.
- the shape of the slit blade 72 is plane-symmetric with respect to a plane a perpendicular to the original fabric S and the AA cross section.
- the slit blade 72 spreads at a predetermined angle with the cutting edge E as the tip in the AA cross section.
- the cross-sectional angle ⁇ 1 of the cutting edge E perpendicular to the cutting edge E is, for example, 25 °.
- FIGS. 8A and 8B are diagrams showing a detailed configuration of the slit blade 72 shown in FIGS. 7A to 7B, where FIG. 8A is a front view and FIG. 8B is a cross-sectional view taken along line BB in FIG.
- FIG. 4C is a cross-sectional view showing a cross section
- FIG. 4C is a cross-sectional view showing the AA cross section when the slit blade 72 is a two-stage blade
- FIG. 4D is a separator slit method using the slit blade 72. It is a flowchart to show.
- the slit blade 72 is attached to the original fabric S so as to form a predetermined angle.
- the attachment angle ⁇ 2 is, for example, 12.8 °.
- the BB cross section is a tangent plane with respect to the original fabric S at the slit position of the slit blade 72.
- the slit blade 72 spreads at a predetermined angle with the cutting edge E as the tip in a cross section T (tangential plane) which is a BB cross section.
- This angle is a cross-sectional angle in a plane including the original fabric S with which the cutting edge E is in contact (hereinafter, “tangential cutting edge angle”).
- tangential cutting edge angle greatly contributes to the quality of the slit separator.
- the slit blade 72 may be a two-stage blade.
- the cutting edge E of this two-stage blade spreads with a cross-sectional angle ⁇ 1 (first stage), and further spreads with an acute cross-section angle ⁇ 4 (second stage).
- the tangential blade edge angle ⁇ 3 can be calculated for the narrow range indicated by the range F as described above.
- the separator slitting method of the present embodiment includes step S ⁇ b> 101 that is a process of transporting the original fabric S and step S ⁇ b> 102 that is a process of slitting the original fabric S.
- step S ⁇ b> 101 that is a process of transporting the original fabric S
- step S ⁇ b> 102 that is a process of slitting the original fabric S.
- tangential plane edge angle theta 3 is within the scope alpha.
- FIG. 9A to 9D show the relationship between the cross-sectional angle ⁇ 1 and the mounting angle ⁇ 2 of the slit blade 72 shown in FIGS. 8A to 8B and the tangential blade edge angle ⁇ 3. It is a schematic diagram shown. Points e to i shown in (a) to (d) of FIG. 9 correspond to points e to i shown in (a) to (b) of FIG.
- the cutting edge E can be regarded as a triangular prism in a narrow range (for example, the above-described range F).
- the cutting edge E is referred to as a “triangular prism”.
- the cross-sectional angle ⁇ 1 described above corresponds to the angle at the point g of the triangle formed by the points f, g, and h that are the vertices of the triangular prism.
- Point i is the midpoint of points f ⁇ h.
- the mounting angle ⁇ 2 described above corresponds to the angle at the point e of the triangle composed of the point e ⁇ g that is the apex of the triangular prism and the point i.
- the following expression (2) is established for the attachment angle ⁇ 2 .
- m / n sin ( ⁇ 2 ) (2) (Tangential cutting edge angle)
- FIG. 9D shows the same cross section as the cross section T shown in FIG.
- the following formula (3) is established for the tangential cutting edge angle ⁇ 3 .
- slit blade 72 for example, an industrial precision knife “FBC4019G” manufactured by Kyocera Corporation can be used.
- the specifications of FBC4019G are as listed below.
- the tangential cutting edge angle ⁇ 3 is an angle at which the cutting edge E of the slit blade 72 cuts into the original fabric S when the original fabric S is slit. Therefore, the tangential cutting edge angle ⁇ 3 greatly contributes to the quality of the slit separator. When the tangential edge angle ⁇ 3 is included in the above range ⁇ , a good slit separator is obtained.
- the slit device 6 (see FIG. 4A) including the cutting device 7 including the slit blade (see FIGS. 5A to 5B) is also included in the present invention. Further, the slit blade 72 fixed by the holder 71 so that the tangential blade edge angle ⁇ 3 is included in the above range ⁇ is also included in the present invention.
- the cross-sectional angle ⁇ 1 and the mounting angle ⁇ 2 may be included in the range of values derived from the relationship of the above equation (5) when the tangential cutting edge angle ⁇ 3 is included in the range ⁇ described above. Also at this time, a good slit separator is obtained.
- the shape of the slit blade 72 is plane symmetric with respect to the plane a perpendicular to the original fabric S and the AA cross section (see FIGS. 7A to 7B). That is, the cross-sectional shape of the slit blade 72 is perpendicular to the plane including the original fabric S (the plane in which the blade edge E is in contact with the original fabric S) and parallel to the direction D that is the conveyance direction of the original fabric S. On the other hand, it is plane symmetric. Thereby, a slit separator having a uniform end face shape is obtained.
- the present invention also includes a slit device 6 (separator slit device) that realizes the separator slit method described above.
- FIGS. 15A and 15B are views for explaining the fluffing generated in the separator 12 and the separator winding body 10, wherein FIG. 15A is a front view of the separator winding body 10, and FIG. 15B is a separator winding body. It is a side view of the body 10, (c) is an enlarged view of the range G of (a).
- the separator 12 is a slit separator.
- the separator winding body 10 includes a core 8 in which the separator 12 is wound around the outer peripheral surface 81a.
- the core 8 includes an outer cylindrical portion 81, an inner cylindrical portion 82, and a plurality of ribs 83, and has the same function as the above-described core u ⁇ l.
- the battery manufactured using the separator 12 may be adversely affected. Further, as shown in FIG. 15C, the aesthetic appearance is impaired. Further, the separator 12 is slit linearly in the MD direction. At this time, when tension is applied to the separator 12, there is a risk of tearing starting from the fluff 12 a. Furthermore, when the fluff 12a is folded during battery manufacture, the folded portion is overlapped with the separator 12, and the resistance becomes higher than that of the surrounding area. Therefore, there is a local difference in current density. For this reason, the fluff 12a can cause deterioration of the positive electrode of the battery and generation of dendrite. According to this embodiment, generation
- FIG. 10 is a front view showing the configuration of the slit blade 72a used in the separator slitting method of the present embodiment.
- the slit blade 72 a is a round blade and includes a circular-arc (arc-shaped) cutting edge Ea.
- the radius r is the radius of this arc.
- the length l is the length of the slit blade 72a along the direction D in the plane including the original fabric S.
- an approach angle ⁇ 2a that is an angle formed by the tangent (tangent plane) of the arc at the point e that is the starting point for slitting the original fabric S and the original fabric S is expressed by the following equation (7).
- cos (90 ° ⁇ 2a ) (l / 2) / r (7)
- the above equation (7) can be transformed into the following equation (8).
- (Slit by single-edged slit blade) 11 is a cross-sectional view showing a configuration of a slit blade 72b different from that shown in FIG. 10, wherein (a) is a cross-sectional view corresponding to (b) of FIG. 7, and (b) is shown in FIG. It is sectional drawing corresponding to (d).
- the slit blade 72b is a single blade.
- the cross section of the slit blade 72b corresponds to the shape of the right half of the cross section of the slit blade 72 shown in FIG. In addition, it is not necessarily limited to this shape, The cross section of the slit blade 72b may be reversed right and left.
- the cross-sectional angle ⁇ 1a of the cutting edge E of the slit blade 72 b is half of the cross-sectional angle ⁇ 1 of the slit blade 72.
- ⁇ 1a ⁇ 1/2 Equation (10)
- the tangent plane included angle theta 3a of the slit blade 72b is half the tangential plane edge angle theta 3 of the slit blade 72.
- ⁇ 3a tan ⁇ 1 (sin ( ⁇ 2 ) ⁇ tan ( ⁇ 1a )) (12)
- the tangential edge angle ⁇ 3a of the single-edged slit blade 72b can be calculated in the same manner as the double-edged slit blade 72.
- (Slit on the roller) 12 is a front view showing a separator slit method different from the separator slit method using the slit blade 72a shown in FIG.
- the original fabric S is conveyed on a roller 66 (conveyance unit).
- the roller 66 is provided with a groove into which a part of the blade edge E of the slit blade 72 can be inserted.
- the blade depth z is the depth of the blade edge E inserted into the roller 66.
- the tangential plane p is a tangential plane with respect to the original fabric S at the slit position of the slit blade 72.
- the approach angle ⁇ 2b formed by the raw fabric S conveyed by the roller 66 and the slit blade 72 can be calculated by the following equation (13).
- ⁇ 2b cos ⁇ 1 ((r ⁇ z) / r) (13)
- r Radius of the roller 66
- the slit blade 72b described above may be used instead of the slit blade 72.
- the tangential cutting edge angle ⁇ 3a can be calculated based on the above equation (12) by treating the approach angle ⁇ 2b in the same manner as the mounting angle ⁇ 2 described above.
- the tangential edge angle can be calculated even in the slit on the roller.
- FIG. 13 is a front view showing a separator slit method further different from the separator slit method using the slit blade 72a shown in FIG.
- the pair of slit blades 72c and 72d slit the original fabric S.
- the size of the slit blade 72c and the size of the slit blade 72d may be different.
- slit blade 72c for example, an industrial precision knife “GUBD-09807T45DC15 (cross-sectional angle ⁇ 1a of blade edge: 45 °)” manufactured by Kyocera Corporation can be used.
- slit blade 72d for example, an industrial precision knife “GDDB-08005T” manufactured by Kyocera Corporation can be used.
- FIG. 14 is a cross-sectional view of a configuration of a slit blade 72d, which is a lower blade of a pair of slit blades 72c and 72d used in the separator slitting method shown in FIG. Is a diagram showing the overall configuration, (b) is an enlarged view of the range C of (a).
- the slit blade 72d is embedded in the roller 66.
- the outer diameter of the slit blade 72d and the outer diameter of the roller 66 are the same. For this reason, the raw fabric S is transported along the outer peripheral portion 72da of the slit blade 72d that rotates in conjunction with the roller 66.
- the slit blade 72d is provided with a groove 72db.
- the slit blade 72c which is the upper blade of the pair of slit blades 72c and 72d, is a single blade.
- the cutting edge Ec of the slit blade 72c is in contact with the side portion 72dc which is a part of the side surface of the groove portion 72db of the slit blade 72d.
- the auxiliary line q is an auxiliary line for angle calculation, and is a straight line passing through two points where the cutting edge Ec of the slit blade 72c and the outer peripheral portion 72da of the slit blade 72d intersect.
- the approach angle “ ⁇ 2cc + ⁇ 2cd ” which is the sum of these one-side approach angles ⁇ 2cc ⁇ ⁇ 2cd, in the same manner as the mounting angle ⁇ 2 described above, the tangential edge angle ⁇ based on the above equation (12) 3a can be calculated.
- the tangential edge angle can be calculated even in a slit formed by a pair of slit blades.
- the polyolefin resin composition is melt-kneaded with a biaxial kneader. It was.
- the polyolefin resin composition was rolled with a pair of rolls having a surface temperature of 150 ° C. to produce a sheet.
- This sheet was immersed in an aqueous hydrochloric acid solution (hydrochloric acid 4 mol / L, nonionic surfactant 0.5% by weight) to remove calcium carbonate, and subsequently stretched at 105 ° C. at an arbitrary magnification to obtain a film thickness of 13
- a polyolefin porous film of 5 ⁇ m was obtained.
- Paraaramid poly (paraphenylene terephthalamide)
- NMP N-methyl-2-pyrrolidone
- the calcium chloride solution was returned to room temperature, and 68.23 g of paraphenylenediamine was added and completely dissolved. While maintaining this solution at 20 ° C.
- alumina powder (alumina C (manufactured by Nippon Aerosil Co., Ltd.), true specific gravity: 3.2 g / cm 3 ) 6 g
- alumina powder (advanced alumina AA-03 (manufactured by Sumitomo Chemical Co., Ltd.), true specific gravity: 4.0 g / Cm 3 ) 6 g was mixed to obtain 12 g of an alumina powder mixture.
- alumina powder mixture 12 g is mixed with the para-aramid solution having a para-aramid concentration of 1.75% by weight and stirred for 240 minutes to obtain an alumina powder-containing para-aramid solution. Filtered through a wire mesh. Thereafter, 0.73 g of calcium oxide was added to the filtrate, and the mixture was neutralized by stirring for 240 minutes, and degassed under reduced pressure to obtain heat-resistant layer forming slurry A.
- a polyolefin porous film roll (width 300 mm, length 300 m) is attached to an unwinding machine, and while the polyolefin porous film is pulled out, the above heat-resistant layer forming slurry A is applied to one side, and continuously laminated porous film A Got.
- NMP was applied to the lower surface of the drawn-out polyolefin porous film with a micro gravure coater, and the heat-resistant layer forming slurry A was applied to the upper surface with a bar coater to a predetermined thickness.
- the coated film was passed through a constant temperature and humidity chamber (temperature 50 ° C., relative humidity 70%) to deposit para-aramid from the coating film.
- this film was guided into a washing apparatus (in which ion-exchanged water was injected at 10 liters / minute and the ion-exchanged water filled therein was discharged at the same rate as the injection rate).
- NMP and calcium chloride were removed from the film through an apparatus having a structure in which a roll was set.
- a plate knife (manufactured by Kyocera Corporation, FBC4019G, blade section angle 25 °) is attached to a slit device (manufactured by Ebara Kogyo Co., Ltd., model HDF-105S-1000).
- the quality film A was slit along a roll having a diameter of 80 mm.
- Carboxymethylcellulose (CMC) (1110 (manufactured by Daicel Finechem Co., Ltd.), true specific gravity: 1.6 g / cm so that the solid content concentration is 28% by weight in a medium in which the weight ratio of pure water: isopropyl alcohol is 90:10. 3
- alumina powder (AKP3000 (manufactured by Sumitomo Chemical Co., Ltd.), true specific gravity: 4.0 g / cm 3 ) are added and mixed at a weight ratio of 3: 100, and slurry B for forming a heat-resistant layer is formed by high-pressure dispersion. Obtained.
- the heat-resistant layer forming slurry B was applied to the uncoated surface of the laminated porous film A to obtain a laminated porous film B continuously.
- the uncoated surface of the laminated porous film A was subjected to corona treatment, and the heat-resistant layer forming slurry B was applied to the surface subjected to the corona treatment using a gravure coating machine and dried.
- a laminated porous film B having a thickness of 25.5 ⁇ m was obtained, in which an aramid heat-resistant layer was laminated on one side of the polyolefin porous film and a heat-resistant layer made of alumina powder was laminated on the other side.
- Table 1 shows the results of verifying that the quality of the slit separator (laminated porous film A or B after being slit) depends on the tangential edge angle ⁇ 3 .
- Example 1 in the first row of Table 1 indicates that the numerical values arranged in the right column are those of the first example. The same applies to other examples.
- Frm type indicates that the slit separator is the above-described laminated porous film A or B.
- blade depth z The “blade depth z”, “cross-sectional angle ⁇ 1 ”, “mounting angle ⁇ 2 ”, and “tangent plane edge angle ⁇ 3 ” are as described in the above embodiment.
- the amount of fluff indicates the amount of fluff generated in the slit portion of the slit separator. “Grade A” means that the slit separator is good (no visible fluff). “Grade B” means that the slit separator has less fuzz. “Grade C” means that the slit separator has a lot of fuzz (a plurality of visible fuzz).
- Example 1 and Comparative Example 1 A plate knife (manufactured by Kyocera Corporation, FBC4019G, blade section angle 25 °) is attached to a slit device (manufactured by Ebara Kogyo Co., Ltd., model HDF-105S-1000).
- the quality film A is slit along a roll having a diameter of 80 mm.
- Examples 4 and 6 and Comparative Example 2 Attach Göbel blade (manufactured by Kyocera Corporation, upper blade: GUBD-09807T60DC15 (blade edge cross-section angle 60 °), lower blade: GDBD-08005T) to the slit device (Hagiwara Kogyo Co., Ltd., model HDF-924-1900).
- the porous film A was slit along the lower blade according to the conditions shown in Table 1.
- the conveyance speed of the separator at the position where the separator is slit is 50 m / min or more and 100 m / min or less.
- the winding tension of this separator is 30 N / m or more and 90 N / m or less.
- the tangential cutting edge angle ⁇ 3 is preferably 3 ° to 35 °, more preferably 3 ° to 21 °, and still more preferably 5 ° to 21 °.
- the fluff amount of Examples 1 to 6 is grades A to B.
- the fluff amount of Comparative Examples 1 and 2 is grade C. That is, when the tangential plane edge angle ⁇ 3 is included in the range of 3 ° to 35 °, it is possible to obtain a good quality slit separator with less fuzz at the slit portion.
- the fluff amount of Examples 1 to 4 is grade A. That is, when the tangential plane edge angle theta 3 is in the range of 5 ° or more 21 ° or less, it is possible to fuzz at the slit portion to obtain a slit separator fewer good quality.
- the quality of the slit separator depends on the tangential edge angle ⁇ 3 . That is, the type of separator to be slit, the type of slit blade (flat blade, round blade), the sectional shape of the slit blade (double blade, single blade), the sectional angle ⁇ 1 of the blade edge of the slit blade, and the mounting angle ⁇ 2 of the slit blade. be different either is, the tangential plane edge angle theta 3 if the same value, it can be said that the slit separator of the same quality.
- FIG. 16 is a schematic diagram showing a configuration for keeping the tangential edge angle ⁇ 3 of a plurality of slit blades constant in this embodiment, and FIGS. 16 (a) to (e) use a round blade slit blade 72c. (F) and (g) show a configuration using a flat-blade slit blade 72.
- the slit blades 72c of round blade by mounting a plurality of slitting blades 72c on one axis 73, it is possible to keep them in a tangential plane edge angle theta 3 constant .
- the slit blade 72c wears out while continuing a slit. Further, the slit blade 72c may have a defect M such as chipping. As shown in FIG. 16B, when only the slit blade 72c in which a problem has occurred is replaced, the slit blade 72A, which is the replaced slit blade 72c, and the other slit blade 72c worn by the slit are larger in size. Become inconsistent. At this time, the slit blade 72A, in the slit blade 72c, the tangential plane edge angle theta 3 no longer aligned. Further, as shown in FIG.
- the original fabric S having a predetermined width conveyed in the direction D is slit by the number of slit blades 72c corresponding to the predetermined width.
- the number of the slit blades 72c is an appropriate number corresponding to the width of the raw material S to be slit so that the degree of wear or the defect frequency of the slit blades 72c is constant.
- the slit blade 72c which slits the same original fabric S is replaced
- FIG. 17 is a schematic diagram for explaining a configuration in which the tangential cutting edge angle ⁇ 3 of the slit blade is substantially the same, and FIG. 17A shows an example in which the position and / or angle of the slit blade 72 of the flat blade varies.
- (B) shows the range in which the tangential cutting edge angle ⁇ 3 of the slit blade 72 varies, and
- (c) shows the original fabric S so that the tangential cutting edge angles ⁇ 3 of a plurality of various slit blades are substantially the same.
- the manufacturing method of the slit separator which slits is shown,
- (d) shows the manufacturing method of the slit separator which slits other original fabric S further.
- the sectional angle ⁇ 1 varies when the slit blade 72 is worn or when the slit blade 72 is defective. As shown in the equation (6), if the cross-sectional angle ⁇ 1 changes, the tangential cutting edge angle ⁇ 3 changes even if the attachment angle ⁇ 2 does not change.
- the tangential blade edge angle varies in the same manner as the tangential blade edge angle ⁇ 3 of the slit blade 72.
- the various slit blades are simply referred to as slit blades.
- the slit separator manufacturing method of the present embodiment includes a step S101 (first conveying step) which is a step of conveying the original fabric S and an original fabric S by a plurality of slit blades.
- Step S102a first slitting process
- step S102a the tangent plane included angle theta 3 of the plurality of slitting blades are included in the range of the angle ⁇ c ⁇ ⁇ .
- the plurality of slit blades means, for example, the plurality of slit blades 72 shown in FIG. 6B or FIG. 16F or the plurality of slit blades 72c shown in FIG. .
- Angle theta c is a target value of the tangential plane edge angle theta 3 of the plurality of slitting blades, for example, a value included in the scope of the above alpha.
- ⁇ is a positive number, and is tangential plane edge angle theta 3 is a value representing a range varying from the angle theta c. If ⁇ is small enough that the angle ( ⁇ c ⁇ ) and the angle ( ⁇ c + ⁇ ) are included in a predetermined range (for example, the above range ⁇ ), the tangential cutting edge angles of the plurality of slit blades It can be treated that ⁇ 3 is at substantially the same angle ⁇ c .
- the tangential cutting edge angle ⁇ 3 of the plurality of slit blades may be included in a range not less than the angle ( ⁇ c ⁇ A ) and not more than the angle ( ⁇ c + ⁇ B ).
- ⁇ A and ⁇ B are 0 or a positive number, and are different from each other. If ⁇ A and ⁇ B are small enough that the angle ( ⁇ c ⁇ A ) and the angle ( ⁇ c + ⁇ B ) are included in a predetermined range (for example, the above range ⁇ ), a plurality of slits are formed.
- tangential plane edge angle theta 3 of the blade can be treated to have almost the same angle theta c.
- the tangential cutting edge angles ⁇ 3 of the plurality of slit blades are substantially the same.
- the angle ( ⁇ c ⁇ ) and the angle ( ⁇ c + ⁇ ) are within a predetermined range. Equivalent to the presence of included angles ⁇ c and ⁇ .
- the predetermined range is a range in which a good quality slit separator with less fuzz at the slit portion can be obtained when the tangential plane edge angle ⁇ 3 is included in the range.
- the range of 11.9 ° to 20.1 ° which is the range of the tangential cutting edge angle ⁇ 3 shown in Examples 2 to 4 in Table 1, can be set as the predetermined range.
- the angle theta c and 16.0 ° is the average between 11.9 ° and 20.1 °. Further, ⁇ is set to 4.1 ° which is a difference between 20.1 ° and 16.0 °. At this time, the angle ( ⁇ c ⁇ ) is 11.9 °. The angle ( ⁇ c + ⁇ ) is 20.1 °. Therefore, there are angles ⁇ c and ⁇ such that the angle ( ⁇ c ⁇ ) and the angle ( ⁇ c + ⁇ ) are included in a predetermined range.
- Step S102a is a step of slitting the raw web S by the plurality of slitting blades, specifically, by putting a plurality of slitting blades against raw S such that a tangential plane edge angle theta 3 is substantially identical This is a step of slitting the raw fabric S.
- step S102a is a process of slitting the raw web S by putting the plurality of slitting blades against raw S to be included within the scope of the tangential plane edge angle theta 3 predetermined .
- This predetermined range can be a range in which, for example, a good quality slit separator with less fluff at the slit portion can be obtained when the tangential edge angle ⁇ 3 is included in the range.
- a predetermined range of the tangential blade edge angle ⁇ 3 (for example, 11.9 ° to 20 °) .1 ° or less)
- a plurality of slit blades having a cross-sectional angle ⁇ 1 (for example, 45 ° or more and 60 ° or less) included in the range satisfying the relationship of the above-described equation (5) are within a range satisfying the relationship of the equation (5).
- Means an insertion angle ⁇ 2 (for example, 12.2 ° or more and 17.3 ° or less) included in the material S.
- the slit separator manufacturing method of the present embodiment transports another porous raw material having the same width as the width of the raw material S transported in step S101 described above.
- Step S101a second conveying step
- Step S102b second slit step
- Step S101a second conveying step
- Step S102b second slit step
- step S102a as shown in FIG. 16 (d), the raw fabric S is slit by some of the slit blades.
- step S102b the original fabric conveyed in step S101a is slit using the same slit blade as the slit of the original fabric S in step S102a. That is, the number of slit blades used depends on the width of the original fabric S to be slit in step S102a and the width of the other original fabric to be slit in step S102b so that the degree of wear or failure frequency of the plurality of slit blades is constant. It is an appropriate number.
- the tangential edge angle ⁇ 3 of the slit blade used for the slit is included in the range of the angle ⁇ c ⁇ ⁇ .
- the tangential edge angle ⁇ 3 affects the fluffing of the slit portion of the slit separator. Further, when the tangential plane edge angle ⁇ 3 becomes substantially the same ( ⁇ c ⁇ ⁇ ⁇ 3 ⁇ ⁇ c + ⁇ ), fuzz can be effectively suppressed.
- the above ⁇ is preferably 5 ° or less, more preferably 3 ° or less, and even more preferably 1 ° or less.
- a plurality of slit blades that slit the original fabric S in step S102a and a plurality of slit blades that slit the other original fabric in step S102b can be used. For this reason, it is possible to make the degree of wear or the frequency of defects of the slit blade constant.
- the slit separator sl (frit film) is slit by two adjacent slit blades among a plurality of slit blades. Thereby, at the both ends in the width direction of the slit separator sl, it is possible to obtain a better quality slit separator with less fuzz at the slit portion.
- the manufacturing method of the slit separator according to the first aspect of the present invention includes a transport step of transporting a porous battery separator original, and a plurality of slit blade angles in a tangential plane with respect to the battery separator original at the slit position. Including a first slitting step of slitting the battery separator original fabric by inserting a plurality of slit blades into the battery separator original fabric so as to be substantially the same.
- the porous separator for a battery is porous, when the slit is slit, the slit portion is likely to fluff.
- the slit blade edge angle (hereinafter referred to as “tangent blade edge angle”) in the tangent plane with respect to the battery separator original fabric at the slit position affects the fluffing of the slit portion of the separator.
- fluffing can be effectively suppressed by making the tangential edge angles substantially the same.
- the slit film is preferably slit by two adjacent slit blades among the plurality of slit blades.
- the plurality of slit blades are preferably attached to a single shaft whose position is fixed with respect to the battery separator original.
- the positions of the plurality of slit blades with respect to the battery separator original fabric are fixed via the same shaft. Therefore, a plurality of slit blades can be inserted into the battery separator original so that the tangential edge angles of the plurality of slit blades are substantially the same.
- At least one of the plurality of slit blades is a flat blade and is rotatably attached to the shaft.
- the rotation angle of the slit blade that is rotatably attached to the shaft is limited by a stopper whose position is fixed with respect to the shaft.
- the slit blade that is rotatably attached to the shaft can be stopped, and the angle can be limited. Thereby, it is possible to reliably adjust the tangential edge angle of the slit blade to be substantially the same.
- the battery separator raw fabric is slit by a part of the plurality of slit blades, and the other porous battery having the same width as the battery separator raw fabric.
- the second conveying step of conveying the separator raw material for the sheet, and the other of the slit blade edges in the tangential plane with respect to the other battery separator raw material at the slit position of the part of the slit blades. It is preferable to further include a second slitting step of slitting the battery separator original by inserting the part of the slit blade into the battery separator original.
- a plurality of slit blades that slit the battery separator original fabric in the first slit step and a plurality of slit blades that slit other battery separator original fabric in the second slit step are the same.
- a slit blade can be used. For this reason, it is possible to make the degree of wear or the frequency of defects of the slit blade constant.
- the method further includes a step of simultaneously replacing the plurality of slit blades.
- the battery separator stock may include an inorganic filler.
- the slit blade is fixed using the above-mentioned stopper, it is possible to prevent the position or angle of the slit blade from being accidentally changed with respect to the battery separator original.
- the above-described manufacturing method is useful because the wear of the slit blade is fast.
- the battery separator stock is slit by inserting the plurality of slit blades into the battery separator stock so that the plurality of slit blade angles are included in a predetermined range. It is preferable.
- ⁇ 3 which is the plurality of slit blade angles
- the plurality of slit blades having a cross-sectional angle ⁇ 1 included in a range satisfying the equation (5) are within a range satisfying the relationship of the equation (5).
- theta 2 which includes, it is preferred to slit the reaction raw separator for the battery by placing against the cell separator raw.
- the above range is preferably a range in which when the plurality of slit edge angles are included in the range, a good quality slit separator with less fluffing at the slit part can be obtained.
- the separator winding body manufacturing method includes the steps in the slit separator manufacturing method described above and the step of winding the slit separator around a core.
- the manufacturing method of the slit separator which concerns on the 1st reference aspect of this invention has the process of conveying a porous battery separator raw material, and the slit blade edge angle in the tangent plane with respect to the said battery separator raw material in a slit position is 3 And slitting the battery separator raw material by inserting a slit blade into the battery separator raw material so as to be in the range of not less than 35 ° and not more than 35 °.
- the porous separator for a battery is porous, when the slit is slit, the slit portion is likely to fluff.
- tangential blade edge angle the slit blade edge angle in the tangential plane with respect to the battery separator original fabric at the slit position affects the fluffing of the slit portion of the separator, It has been found that fluffing can be effectively suppressed when the tangential edge angle is in the range of 3 ° to 35 °.
- the slit blade angle is preferably 28 ° or less.
- the slit blade angle is more preferably in the range of 5 ° to 21 °.
- the battery separator raw material may form a curved surface that is convex toward the slit blade at the slit position.
- the tangential cutting edge angle is determined by the length by which the cutting edge of the slit blade is inserted into the curved surface, so that it is easy to adjust the tangential cutting edge angle.
- the cutting edge of the slit blade may be arcuate.
- the tangential cutting edge angle is determined by the length of the slit blade inserted into the battery separator raw sheet on which the cutting edge is conveyed, so that it is easy to adjust the tangential cutting edge angle.
- the shape of the edge of the slit blade may be plane symmetric with respect to a plane that is perpendicular to the tangential plane and parallel to the transport direction of the battery separator original.
- a slit separator having a more uniform shape of the slit end face can be obtained.
- the separator winding body manufacturing method according to the second embodiment of the present invention includes each step in the above-described slit separator manufacturing method and a step of winding the slit separator around a core.
- a separator roll comprising a core and a separator wound around the core is obtained.
- the slit portion of the separator corresponds to the surface of the wound body on the side surface side of the core.
- the separator slit method includes a step of transporting a porous battery separator original, and a slit edge angle in a tangential plane with respect to the battery separator original at the slit position is 3 And slitting the battery separator raw material by inserting a slit blade into the battery separator raw material so as to be in the range of not less than 35 ° and not more than 35 °.
- a separator slit device includes a transport unit that transports a porous battery separator original, and a slit blade that slits the battery separator original, and the slit blade Is a configuration in which the blade edge angle in the tangent plane with respect to the battery separator original fabric at the slit position is in the range of 3 ° to 35 °.
- the present invention can be used for a method of slitting a film in an arbitrary direction, a method of manufacturing a film winding body, and a film slitting apparatus.
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Abstract
Description
後述の実施形態において共通する、リチウムイオン二次電池、セパレータ、耐熱セパレータ、耐熱セパレータの製造方法、スリット装置、切断装置について順に説明する。
リチウムイオン二次電池に代表される非水電解液二次電池は、エネルギー密度が高く、それゆえ、現在、パーソナルコンピュータ、携帯電話、携帯情報端末等の機器、自動車、航空機等の移動体に用いる電池として、また、電力の安定供給に資する定置用電池として広く使用されている。
セパレータ12は、リチウムイオン二次電池1の正極であるカソード11と、その負極であるアノード13との間に、これらに挟持されるように配置される。セパレータ12は、カソード11とアノード13との間を分離しつつ、これらの間におけるリチウムイオンの移動を可能にする多孔質フィルムである。セパレータ12は、その材料として、例えば、ポリエチレン、ポリプロピレン等のポリオレフィンを含む。
図3は、図1に示されるリチウムイオン二次電池1の他の構成を示す模式図であって、(a)は通常の構成を示し、(b)はリチウムイオン二次電池1が急激に昇温したときの様子を示す。
リチウムイオン二次電池1の耐熱セパレータの製造は特に限定されるものではなく、公知の方法を利用して行うことができる。以下では、多孔質フィルム5がその材料として主にポリエチレンを含む場合を仮定して説明する。しかし、多孔質フィルム5が他の材料を含む場合でも、同様の製造工程により、セパレータ12を製造できる。
耐熱セパレータまたは耐熱層を有しないセパレータ(以下「セパレータ」)は、リチウムイオン二次電池1などの応用製品に適した幅(以下「製品幅」)であることが好ましい。しかし、生産性を上げるために、セパレータは、その幅が製品幅以上となるように製造される。そして、一旦製造された後に、セパレータは、製品幅に切断(スリット)される。
スリット装置6では、原反を巻きつけた円筒形状のコアcが、巻出ローラー61に嵌められている。図4の(b)に示されるように、原反は、コアcから経路UまたはLへ巻き出される。巻き出された原反は、ローラー63~67を経由し、ローラー68へ搬送される。搬送される工程において原反は、複数のセパレータにスリットされる。なお、ローラー67は、なくてもよい。このとき、この原反は、ローラー64からローラー68へ搬送される。
図4の(b)に示されるように、複数のスリットセパレータの一部は、それぞれ、巻取ローラー70Uに嵌められた円筒形状の各コアu(ボビン)へ巻き取られる。また、複数のスリットセパレータの他の一部は、それぞれ、巻取ローラー70Lに嵌められた円筒形状の各コアl(ボビン)へ巻き取られる。なお、ロール状に巻き取られたスリットセパレータ及びコアu・lの一体物を「捲回体」と称する。
図5は、図4の(a)に示されるスリット装置6の切断装置7の構成を示す図であって、(a)は切断装置7の側面図であり、(b)は切断装置7の正面図である。
本発明の第一実施形態について、図6~図9に基づき説明する。
(スリット刃による原反の切り分け)
図6は、本実施形態のセパレータスリット方法を示す模式図であって、(a)は正面図であり、(b)は上面図である。
図7は、図6の(a)~(b)に示されるセパレータスリット方法に利用するスリット刃72の構成を示す図であって、(a)は正面図であり、(b)は(a)のA-A断面を示す断面図である。
図8は、図7の(a)~(b)に示されるスリット刃72の詳細構成を示す図であって、(a)は正面図であり、(b)は(a)のB-B断面を示す断面図であり、(c)はスリット刃72が二段刃であるときの上述のA-A断面を示す断面図であり、(d)はスリット刃72を利用するセパレータスリット方法を示すフローチャートである。
図8の(b)に示されるように、スリット刃72は、B-B断面である断面T(接平面)において、刃先Eを先端として所定の角度に広がっている。この角度は、刃先Eが接する原反Sを含む平面における断面角度(以下「接平面刃先角度」)である。発明者らは、この接平面刃先角度が、スリットセパレータの良否に大きく寄与することを発見した。接平面刃先角度θ3が、3°以上35°以下の範囲(以下「範囲α」)に含まれるとき、スリット部位における毛羽立ちが少ない良品質のスリットセパレータを得ることができる。
図8の(c)に示されるように、スリット刃72は、二段刃であってもよい。この二段刃の刃先Eは、断面角度θ1を成して広がり(一段目)、さらに鋭角な断面角度θ4を成して広がる(二段目)。この二段刃においても、範囲Fで示される狭い範囲について、上述のように接平面刃先角度θ3を計算できる。
図8の(d)に示されるように、本実施形態のセパレータスリット方法は、原反Sを搬送する工程であるステップS101と、原反Sをスリットする工程であるステップS102とを含む。このとき、接平面刃先角度θ3は、範囲αに含まれる。
図9の(a)~(d)は、図8の(a)~(b)に示されるスリット刃72の断面角度θ1及び取付角度θ2と、接平面刃先角度θ3との関係を示す模式図である。図9の(a)~(d)に示される点e~iは、図8の(a)~(b)に示される点e~iに対応している。
図9の(b)に示されるように、上述の断面角度θ1は、三角柱の頂点である点f・g・hからなる三角形の点gにおける角度に対応している。点iは、点f・hの中点である。そして、点f・hからなる辺の長さをzとおき、点g・iからなる線分の長さをmとおくと、断面角度θ1について下式(1)が成り立つ。
z/2=m・tan(θ1/2) ……式(1)
図9の(c)に示されるように、上述の取付角度θ2は、三角柱の頂点である点e・gと、点iとからなる三角形の、点eにおける角度に対応している。そして、点e・iからなる辺の長さをnとおくと、取付角度θ2について下式(2)が成り立つ。
m/n=sin(θ2) ……式(2)
(接平面刃先角度)
図9の(d)は、図8の(b)に示される断面Tと同一の断面を示している。そして、接平面刃先角度θ3について、下式(3)が成り立つ。
tan(θ3/2)=(z/2)/n ……式(3)
上式(3)に、上式(1)を代入すると、下式(4)が得られる。
tan(θ3/2)=(m/n)・tan(θ1/2) ……式(4)
上式(4)に、上式(2)を代入すると、下式(5)が得られる。
tan(θ3/2)=sin(θ2)・tan(θ1/2) ……式(5)
上式(5)を変形すると、下式(6)が得られる。
θ3=2・tan-1(sin(θ2)・tan(θ1/2)) ……式(6)
(スリット刃の具体例)
スリット刃72には、例えば、京セラ株式会社製の工業用精密ナイフ「FBC4019G」を利用できる。FBC4019Gの仕様は、以下に列挙するとおりである。
・材質:FW25(小さな粒子の集合体で構成された材質)
ビッカース硬度[Kg/mm2]:1700
抗折強度[MPa]:3900
破壊靱性[MPa・m1/2]:10.3
線膨張係数[1/℃(×10-6)]:5.5
刃先Eを構成する粒子の粒径[μm]:0.6
・刃先Eの長さ[mm]:40
・幅[mm]:19
・厚み[mm]:0.25
・刃先Eの断面角度θ1[°]:25
≪本実施形態の効果≫
接平面刃先角度θ3は、原反Sをスリットするときに、スリット刃72の刃先Eが原反Sに切り込む角度である。ゆえに、接平面刃先角度θ3は、スリットセパレータの良否に大きく寄与する。そして、接平面刃先角度θ3が上述の範囲αに含まれることにより、良品のスリットセパレータが得られる。
断面角度θ1及び取付角度θ2は、接平面刃先角度θ3が上述の範囲αに含まれるときの、上式(5)の関係から導出される値の範囲に含まれていればよい。このときにも、良品のスリットセパレータが得られる。
上述のように、スリット刃72の形状は、原反SとA-A断面(図7の(a)~(b)参照)とに垂直な平面aに対し面対称である。つまり、スリット刃72の断面形状は、原反Sを含む平面(刃先Eが原反Sに接する平面)に垂直であり、かつ、原反Sの搬送方向である方向Dに平行である平面に対し、面対称である。これにより、端面の形状が均一なスリットセパレータが得られる。
なお、上述のセパレータスリット方法の各工程を含むスリットセパレータの製造方法も本発明に含まれる。
図15は、セパレータ12及びセパレータ捲回体10に発生する毛羽立ちの態様を説明するための図であって、(a)はセパレータ捲回体10の正面図であり、(b)はセパレータ捲回体10の側面図であり、(c)は(a)の範囲Gの拡大図である。なお、以下の説明において、セパレータ12はスリットセパレータである。
毛羽12aは、セパレータ捲回体10からセパレータ12を巻き出すときなどに飛散すると、セパレータ12を利用して製造する電池に悪影響を与える虞がある。また、図15の(c)に示されるように、美観を損なう。また、セパレータ12は、MD方向に直線的にスリットされる。このとき、セパレータ12に張力を掛けたときに、毛羽12aを起点に裂けが生じる虞がある。さらに、電池製造において毛羽12aが折り込まれると、折り込まれた部分はセパレータ12が重なり周囲に比べて抵抗が高くなるため、局所的に電流密度に差が生じる。このため、毛羽12aは、電池の正極劣化やデンドライト生成の原因となりうる。本実施形態によれば、このような毛羽12aの発生を抑制できる。
本発明の第二実施形態について、図10~図13に基づき説明する。なお、説明の便宜上、上述の実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する(以下の実施形態において同様)。
(丸刃のスリット刃)
図10は、本実施形態のセパレータスリット方法に利用するスリット刃72aの構成を示す正面図である。
cos(90°-θ2a)=(l/2)/r ……式(7)
上式(7)は、下式(8)に変形できる。
90°-θ2a=cos-1((l/2)/r) ……式(8)
上記(8)は、下式(9)に変形できる。
θ2a=90°-cos-1((l/2)/r) ……式(9)
(平刃のスリット刃と同一の効果が得られる等価な条件)
そして、スリット刃72aの刃先Eaと、原反Sとが、進入角度θ2aをなすということは、上述のスリット刃72の刃先Eと、原反Sとが、取付角度θ2をなすということに等価である。このとき、図10のA-A断面は、図7の(a)~(b)に示されるA-A断面に対応する。また、図10のB-B断面は、図8の(a)~(b)に示されるB-B断面に対応する。
図11は、図10に示されるものとは異なるスリット刃72bの構成を示す断面図であって、(a)は図7の(b)に対応する断面図であり、(b)は図9の(d)に対応する断面図である。
θ1a=θ1/2 ……式(10)
また、図11の(b)に示されるように、スリット刃72bの接平面刃先角度θ3aは、スリット刃72の接平面刃先角度θ3の半分である。
θ3a=θ3/2 ……式(11)
上式(6)に、上式(10)及び(11)を代入すると下式(12)が得られる。
θ3a=tan-1(sin(θ2)・tan(θ1a)) ……式(12)
上式(12)により、片刃のスリット刃72bの接平面刃先角度θ3aも、両刃のスリット刃72と同様に計算することができる。
図12は、図10に示されるスリット刃72aを利用するセパレータスリット方法とは異なるセパレータスリット方法を示す正面図である。
θ2b=cos-1((r-z)/r) ……式(13)
r:ローラー66の半径
この角度θを上述の取付角度θ2と同様に扱うことにより、上式(6)に基づき接平面刃先角度θ3を計算できる。
図13は、図10に示されるスリット刃72aを利用するセパレータスリット方法とはさらに異なるセパレータスリット方法を示す正面図である。
rc2+OcOd2-2・rc・OcOd・cos(θ2cc)=rd2 ……式(14)
rd2+OcOd2-2・rd・OcOd・cos(θ2cd)=rc2 ……式(15)
OcOd=rc+rd-z ……式(16)
rc:スリット刃72cの半径
rd:スリット刃72dの半径
OcOd:スリット刃72cの回転中心である点Ocとスリット刃72dの回転中心である点Odとの間の長さ
θ2cc:補助線qとスリット刃72cの刃先Ecとがなす片側進入角度
θ2cd:補助線qとスリット刃72dの外周部72daとがなす片側進入角度
z:スリット刃72cとスリット刃72dとが接触する深さ
上式(14)~式(15)を変形すると、以下の式(17)~式(18)が得られる。θ2cc=cos-1((rc2+OcOd2-rd2)/(2・rc・OcOd)) ……式(17)
θ2cd=cos-1((rd2+OcOd2-rc2)/(2・rd・OcOd)) ……式(18)
これらの片側進入角度θ2cc・θ2cdの和の角度である進入角度「θ2cc+θ2cd」を上述の取付角度θ2と同様に扱うことにより、上式(12)に基づき接平面刃先角度θ3aを計算できる。
本発明の第三実施形態について説明する。
以下では、スリットされるセパレータの種類、スリット刃の種類(平刃、丸刃)、スリット刃の断面形状(両刃、片刃)、スリット刃の刃先の断面角度θ1、及びスリット刃の取付角度θ2を種々に変更し、スリットセパレータの良否が接平面刃先角度θ3に依存することを具体的に検証する。
<ポリオレフィン多孔質フィルムの製造>
この検証では、二種類のセパレータを利用する。これらのセパレータは、上述の「耐熱セパレータ」である。この耐熱セパレータを構成する多孔質フィルムの製造条件は以下のとおりである。
上述の耐熱セパレータを構成する耐熱層を得るためのパラアラミドの製造条件は以下のとおりである。
上述の耐熱層を得るための耐熱層形成用スラリーAの製造条件は以下のとおりである。
上述の二種類のセパレータのうちの一方の製造条件は以下のとおりである。
上述の二種類のセパレータのうちの他方に設ける耐熱層を得るための耐熱層形成用スラリーBの製造条件は以下のとおりである。
上述の他方のセパレータの製造条件は以下のとおりである。
スリット装置(萩原工業社製、モデルHDF-105S-1000)に板ナイフ(京セラ社製、FBC4019G、刃先断面角度25°)を取り付け、上記積層多孔質フィルムAを表1に示す条件に従って、積層多孔質フィルムAを直径80mmのロールに沿わせながらスリットした例である。
スリット装置(萩原工業社製、モデルHDF-924―1900)にゲーベル刃(京セラ社製、上刃:GUBD-09807T45DC15(刃先断面角度45°)、下刃:GDBD-08005T)を取り付け、上記積層多孔質フィルムBを表1に示す条件に従って、積層多孔質フィルムBを下刃に沿わせながらスリットした例である。
スリット装置(萩原工業社製、モデルHDF-924―1900)にゲーベル刃(京セラ社製、上刃:GUBD-09807T60DC15(刃先断面角度60°)、下刃:GDBD-08005T)を取り付け、上記積層多孔質フィルムAを表1に示す条件に従って、積層多孔質フィルムAを下刃に沿わせながらスリットした例である。
なお、ゲーベル刃の上刃は片刃であるため、このゲーベル刃を利用する実施例2~6及び比較例2では、断面角度θ1の値を、上式(12)のθ1aに代入し得られたθ3aの値を、接平面刃先角度θ3としている。
接平面刃先角度θ3は、3°以上35°以下が好ましく、3°以上21°以下がより好ましく、5°以上21°以下がさらに好ましい。
本発明の第四実施形態について説明する。
図16は、本実施形態における複数のスリット刃の接平面刃先角度θ3を一定に保つための構成を示す模式図であって、(a)~(e)は丸刃のスリット刃72cを用いた構成を示し、(f)(g)は平刃のスリット刃72を用いた構成を示す。
図17は、スリット刃の接平面刃先角度θ3をほぼ同一にする構成を説明する模式図であって、(a)は平刃のスリット刃72の位置及び/または角度が変動する例を示し、(b)はスリット刃72の接平面刃先角度θ3が変動する範囲を示し、(c)は複数の種々のスリット刃の接平面刃先角度θ3をほぼ同一となるように原反Sをスリットするスリットセパレータの製造方法を示し、(d)は他の原反Sをさらにスリットするスリットセパレータの製造方法を示す。
図17の(c)に示されるように、本実施形態のスリットセパレータの製造方法は、原反Sを搬送する工程であるステップS101(第1搬送工程)と、複数のスリット刃によって原反Sをスリットする工程であるステップS102a(第1スリット工程)とを含む。
以上のとおり、複数のスリット刃の接平面刃先角度θ3がほぼ同一になっていることは、ステップS102aにおいて、角度(θc-Δ)と角度(θc+Δ)とが予め定めた範囲に含まれる角度θcとΔとが存在することと等価である。
複数のスリット刃によって原反Sをスリットする工程であるステップS102aは、具体的には、接平面刃先角度θ3がほぼ同一となるように原反Sに対して複数のスリット刃を入れることによって原反Sをスリットする工程である。
図17の(d)に示されるように、本実施形態のスリットセパレータの製造方法は、上述のステップS101において搬送される原反Sの幅と同じ幅を有する多孔質の他の原反を搬送する工程であるステップS101a(第2搬送工程)と、この他の原反に対して複数のスリット刃を入れることによってスリットする工程であるステップS102b(第2スリット工程)とをさらに含んでもよい。
図16に示されるように、スリット刃を固定することにより、スリット装置6(図4参照)の運転で、誤って原反Sに対するスリット刃の位置または角度を変えてしまうことを防止できる。特に、無機フィラーを含むセパレータ原反をスリットするときには、スリット刃の摩耗が早いため、以上の構成が有用である。
本発明の第一態様に係るスリットセパレータの製造方法は、多孔質の電池用セパレータ原反を搬送する搬送工程と、スリット位置における上記電池用セパレータ原反に対する接平面内での複数のスリット刃先角度がほぼ同一となるように上記電池用セパレータ原反に対して複数のスリット刃を入れることによって上記電池用セパレータ原反をスリットする第1スリット工程とを含む。
tan(θ3/2)=sin(θ2)・tan(θ1/2) ……式(5)
上記複数のスリット刃先角度であるθ3の予め定めた範囲において、上記式(5)を満たす範囲に含まれる断面角度θ1の上記複数のスリット刃を、上記式(5)関係を満たす範囲に含まれる取付角度θ2にて、上記電池用セパレータ原反に対して入れることによって上記電池用セパレータ原反をスリットすることが好ましい。
本発明の第一参考態様に係るスリットセパレータの製造方法は、多孔質の電池用セパレータ原反を搬送する工程と、スリット位置における上記電池用セパレータ原反に対する接平面内でのスリット刃先角度が3°以上35°以下の範囲となるように上記電池用セパレータ原反に対してスリット刃を入れることによって上記電池用セパレータ原反をスリットする工程とを含む。
本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。
3 リチウムイオン
4 耐熱層
6 スリット装置(セパレータスリット装置)
7 切断装置
12 セパレータ
66 ローラー(搬送部)
71 ホルダー
72・72a~72d スリット刃
E・Ea・Ec 刃先
P 孔
S 原反(セパレータ)
S101 セパレータ原反を搬送する工程、第1搬送工程
S101a 他のセパレータ原反を搬送する工程、第2搬送工程
S102 セパレータ原反をスリットする工程
S102a セパレータ原反をスリットする工程、第1スリット工程
S102b セパレータ原反をスリットする工程、第2スリット工程
T 断面(接平面)
θ1・θ1a・θ4 断面角度
θ2 取付角度
θ2a・θ2b 進入角度
θ2cc・θ2cd 片側進入角度
θ3・θ3a 接平面刃先角度
Claims (12)
- 多孔質の電池用セパレータ原反を搬送する第1搬送工程と、
スリット位置における上記電池用セパレータ原反に対する接平面内での複数のスリット刃先角度がほぼ同一となるように上記電池用セパレータ原反に対して複数のスリット刃を入れることによって上記電池用セパレータ原反をスリットする第1スリット工程と、
を含むことを特徴とするスリットセパレータの製造方法。 - 上記第1スリット工程において、スリットされたフィルムは、上記複数のスリット刃のうちの隣り合う二つのスリット刃によってスリットされたものであることを特徴とする請求項1に記載のスリットセパレータの製造方法。
- 上記複数のスリット刃は、上記電池用セパレータ原反に対して位置を固定された一つの軸に取り付けられていることを特徴とする請求項1または2に記載のスリットセパレータの製造方法。
- 上記複数のスリット刃の少なくとも一つは、平刃であり、かつ、上記軸に回転可能なように取り付けられていることを特徴とする請求項3に記載のスリットセパレータの製造方法。
- 上記軸に回転可能なように取り付けられている上記スリット刃の回転角度は、上記軸に対して位置を固定されたストッパーによって限定されていることを特徴とする請求項4に記載のスリットセパレータの製造方法。
- 上記第1スリット工程において、上記複数のスリット刃のうちの一部のスリット刃によって上記電池用セパレータ原反をスリットし、
上記電池用セパレータ原反の幅と同じ幅を有する多孔質の他の電池用セパレータ原反を搬送する第2搬送工程と、
上記一部のスリット刃の、スリット位置における上記他の電池用セパレータ原反に対する接平面内でのスリット刃先角度がほぼ同一となるように上記他の電池用セパレータ原反に対して上記一部のスリット刃を入れることによって上記電池用セパレータ原反をスリットする第2スリット工程と、
をさらに含むことを特徴とする請求項1から5のいずれか一項に記載のスリットセパレータの製造方法。 - 上記複数のスリット刃を一斉に交換する工程をさらに含むことを特徴とする請求項6に記載のスリットセパレータの製造方法。
- 上記電池用セパレータ原反は、無機フィラーを含むことを特徴とする請求項1から7のいずれか一項に記載のスリットセパレータの製造方法。
- 上記第1スリット工程において、上記複数のスリット刃先角度が予め定めた範囲に含まれるように上記電池用セパレータ原反に対して上記複数のスリット刃を入れることによって上記電池用セパレータ原反をスリットすることを特徴とする請求項1から8のいずれか一項に記載のスリットセパレータの製造方法。
- 上記第1スリット工程において、
tan(θ3/2)=sin(θ2)・tan(θ1/2) ……式(5)
上記複数のスリット刃先角度であるθ3の予め定めた範囲において、上記式(5)を満たす範囲に含まれる断面角度θ1の上記複数のスリット刃を、上記式(5)関係を満たす範囲に含まれる取付角度θ2にて、上記電池用セパレータ原反に対して入れることによって上記電池用セパレータ原反をスリットすることを特徴とする請求項1から9のいずれか一項に記載のスリットセパレータの製造方法。 - 上記範囲は、上記複数のスリット刃先角度がその範囲に含まれるときに、スリット部位における毛羽立ちが少ない良品質のスリットセパレータを得ることができる範囲であることを特徴とする請求項9または10に記載のスリットセパレータの製造方法。
- 請求項1から11のいずれか一項に記載のスリットセパレータの製造方法における各工程と、
スリットされたセパレータをコアに巻く工程と、
を含むことを特徴とするセパレータ捲回体の製造方法。
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WO2016103755A1 (ja) | 2016-06-30 |
KR20160094374A (ko) | 2016-08-09 |
CN106537644A (zh) | 2017-03-22 |
US20160325448A1 (en) | 2016-11-10 |
KR101767024B1 (ko) | 2017-08-09 |
CN106537644B (zh) | 2020-03-03 |
JP6030268B1 (ja) | 2016-11-24 |
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