Sumitomo Chemical Company, Limited

Koichiro Watanabe

Jian Wang

Yasutoshi Minemoto

Tatsuya Kataoka

Hirohiko Hasegawa

Kiyomu Nomura

Akihiko Shin

Shinya Kimura

Noboru Hayakawa

Koji Kashu

Yasuo Shinohara

To easily specify the position of a defect in a separator, a method for producing a separator original sheet () includes the steps of: forming a separator original sheet () including a separator original sheet () and a heat-resistant layer coated on the separator original sheet (); detecting a defect (D) in the separator original sheet (); and recording information including information on a position of the defect (D) which position is a position in the width direction of the separator original sheet ().

Method for manufacturing separator web, method for manufacturing separator, separator web, and apparatus for manufacturing separator web

A drying roller includes: a cylindrical member for drying a separator original sheet, with hot water which is supplied into the cylindrical member and ejected from inside the cylindrical member, the separator original sheet being wrapped on an outer peripheral surface of the cylindrical member; and a discharge pipe for discharging the hot water toward one inner end surface of the cylindrical member, the heating medium being discharged at a position where a distance to the one end surface of the cylindrical member is longer than a distance to the other inner end surface of the cylindrical member.

Heating roller and film production method

A gravure roll, in which the outside peripheral surface of a metal roll main body has a plurality of oblique line shaped protrusions forming a prescribed angle with the center axis of the roll main body and the coating liquid can be held in a plurality of oblique line shaped recesses formed between each of the plurality of protrusions, is configured such that the roll main body has a diamond-like carbon layer on the entire outer peripheral surface thereof, a head part for each of the plurality of protrusions is cut down, and each of the plurality of protrusions has a trapezoidal cross-sectional shape that becomes gradually narrower in width moving in direction toward the head part. A separator with a uniform weight per unit area can be manufactured wherein the coating liquid is coated onto a base material film using this gravure roll.

Gravure roll, method of fabricating a separator, and separator

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 () being porous is conveyed, the separator original sheet () into a plurality of separators (), including 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 ().

Method for producing separator and method for slitting separator original sheet

A drying device includes a first cylindrical member and a second cylindrical member. The first cylindrical member has an outer peripheral surface having a surface temperature that is higher on one width wise side where an end is present than on the other widthwise side where another end is present, whereas the second cylindrical member has an outer peripheral surface having a surface temperature that is lower on the one widthwise side where an end is present than on the other widthwise side where another end is present.

Nonaqueous electrolyte secondary battery separator heating device and nonaqueous electrolyte secondary battery separator production method

The present invention provides a method for producing a laminated porous film comprising a porous film substrate and a heat-resistant layer. The method comprises forming a heat-resistant layer mainly comprising a filler on the surface of the porous film substrate by applying a coating slurry comprising a solvent, a binder resin and the filler to the surface of the porous film substrate and then removing the solvent, wherein the coating slurry is prepared so as to have a contact angle of 75&#xb0; or more with an untreated porous film substrate, and the method comprises conducting surface treatment of a porous film substrate so that the contact angle of the coating slurry with the porous film substrate can be 65&#xb0; or less before applying the coating slurry to the surface of the porous film substrate.

Method for producing laminated porous film

A roll member having an outer circumferential surface in which a plurality of grooves are formed, wherein the plurality of grooves are arranged at an angle relative to a direction parallel to a central axis of the roll member. A coating device for coating a film member with a coating liquid, the coating device comprising the roll member. A separator production device for producing a separator in which a heat-resistant layer is laminated over a substrate. The separator production device comprising the coating device. A secondary battery production device for producing a secondary battery comprising a positive electrode plate, a negative electrode plate, and a pair of separators that sandwich the positive electrode plate or the negative electrode plate therebetween. The secondary battery production device comprising the separator production device.

Roll member, coating device, separator production device, and secondary batter production device

Provided is a multi-layered porous film which includes a functional layer having a controlled thickness in a length-wise direction thereof and which is suitable as a separator for batteries. The multi-layered porous film includes a base film, and a functional layer containing both an inorganic filler and a binder resin, the functional layer being formed on the base film, wherein a difference between a maximum basis weight and a minimum basis weight of the multi-layered porous film in a length-wise direction thereof is equal to or smaller than 2 grams/m, the basis weight being measured every 100 meters interval. The separator fabricated by cutting a film roll comprised of a multi-layered porous film into pieces each having a given length has small lot-based fluctuation in quality, and makes it possible to fabricate a battery having a small fluctuation in quality.

Multi-layered porous film and nonaqueous-electrolyte secondary battery

A method for producing a functional film is provided. In the method, a film is sequentially transferred through processing devices including a film inspection device. At least one expander roll is used for film transfer from a processing device to the film inspection device next to the processing device.

Method for producing separator film

Method for producing separator and method for slitting

Roll member, coating device, separator production device, and secondary battery production device

There is provided a coating method for forming a coat having a less unevenness in its thickness on a sheet-like substrate. In the method in which a coating liquid is continuously supplied from a supply head to a surface of a continuously traveling sheet-like substrate to form a coat while controlling its thickness by a coating bar disposed above the sheet-like substrate, the coating liquid of which amount corresponds to an amount required for forming a predetermined coat thickness is continuously and constantly supplied to the surface of the sheet-like substrate, and the coating bar is moved up and down on the basis of increase and decrease in an amount of a holdup of the coating liquid which is formed just near the coating bar, so that the coat is formed.

Growing community of inventors

Niihama, Japan

Koichiro Watanabe