Patents by Inventor Masao Fukunaga

Masao Fukunaga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10916760
    Abstract: A method of manufacturing a secondary battery including an electrode body having a positive electrode plate (40) having a positive electrode tab (4c), a negative electrode plate (5) having a negative electrode tab (5c), and a separator, in which the positive electrode tab (4c) is connected to a positive electrode collector in a curved state and the negative electrode tab (5c) is connected to a negative electrode collector in a curved state, and in which, as the positive electrode plate (4), one provided with a cutaway (4e) at a base of the positive electrode tab (4c) in a region where a positive electrode active material mixture layer (4a) is formed on a positive electrode core body is used.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: February 9, 2021
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Masao Fukunaga, Ryoichi Wakimoto
  • Publication number: 20200321658
    Abstract: Provided is a method for manufacturing a secondary battery including a stacked electrode body including a plurality of positive electrode plates (1) and a plurality of negative electrode plates, the positive electrode plates (1) each having a positive electrode active material layer (1b) formed on a positive electrode substrate (1a), a positive electrode substrate exposed portion where the positive electrode active material layer (1b) is not formed on the positive electrode substrate (1a) being provided as a positive electrode tab portion (1e) at the end of the positive electrode plate (1). The method includes a cutout forming step of providing a cutout in a region at the base of the positive electrode plate (1) where the active material layer (1b) is formed, and a compressing step of compressing the positive electrode active material layer (1b) after the cutout forming step.
    Type: Application
    Filed: May 23, 2017
    Publication date: October 8, 2020
    Applicants: Panasonic Corporation, SANYO Electric Co., Ltd.
    Inventors: Masao Fukunaga, Mamoru Kuramoto
  • Patent number: 10673059
    Abstract: Disclosed is a method for manufacturing a positive electrode including a positive electrode substrate made of aluminum foil and a positive electrode active material layer containing a positive electrode active material on the positive electrode substrate. This method includes the steps of forming the positive electrode active material layer on the positive electrode substrate; forming a protective layer on the positive electrode substrate; stretching an exposed region of the positive electrode substrate after the steps of forming the active material layer and the protective layer; and compressing the positive electrode active material layer after the stretching step.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: June 2, 2020
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Masao Fukunaga, Ryosuke Shirota, Kazuya Nishio, Haruya Nakai
  • Patent number: 10553852
    Abstract: Disclosed is a method for manufacturing a positive electrode including a positive electrode substrate made of aluminum foil and a positive electrode active material layer containing a positive electrode active material on the positive electrode substrate. This method includes the steps of stretching a first exposed region of the positive electrode substrate with a first stretching roller disposed upstream; stretching a second exposed region of the positive electrode substrate with a second stretching roller disposed downstream; and compressing the positive electrode active material layer with a pair of compression rollers.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: February 4, 2020
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Masao Fukunaga, Ryosuke Shirota, Kazuya Nishio, Haruya Nakai
  • Publication number: 20190379027
    Abstract: A method of manufacturing a secondary battery including an electrode body having a positive electrode plate (40) having a positive electrode tab (4c), a negative electrode plate (5) having a negative electrode tab (5c), and a separator, in which the positive electrode tab (4c) is connected to a positive electrode collector in a curved state and the negative electrode tab (5c) is connected to a negative electrode collector in a curved state, and in which, as the positive electrode plate (4), one provided with a cutaway (4e) at a base of the positive electrode tab (4c) in a region where a positive electrode active material mixture layer (4a) is formed on a positive electrode core body is used.
    Type: Application
    Filed: June 28, 2017
    Publication date: December 12, 2019
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Masao FUKUNAGA, Ryoichi WAKIMOTO
  • Publication number: 20190280287
    Abstract: A positive electrode plate including a positive electrode core and a positive electrode active material mixture layer formed on the positive electrode core is produced. The positive electrode plate includes a positive electrode exposed core portion at an end thereof. The positive electrode plate has a flat region in which the thickness of the positive electrode active material mixture layer is substantially uniform and an inclined portion in which the thickness of the positive electrode active material mixture layer gradually decreases from an end of the flat region toward the positive electrode exposed core portion. The positive electrode plate is cut such that a boundary between a main portion of the positive electrode plate and a positive electrode tab portion (40) is at the inclined portion. After that, the positive electrode active material mixture layer is compressed.
    Type: Application
    Filed: July 24, 2017
    Publication date: September 12, 2019
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Masao Fukunaga, Tetsuya Sato
  • Publication number: 20170125791
    Abstract: Disclosed is a method for manufacturing a positive electrode including a positive electrode substrate made of aluminum foil and a positive electrode active material layer containing a positive electrode active material on the positive electrode substrate. This method includes the steps of forming the positive electrode active material layer on the positive electrode substrate; forming a protective layer on the positive electrode substrate; stretching an exposed region of the positive electrode substrate after the steps of forming the active material layer and the protective layer; and compressing the positive electrode active material layer after the stretching step.
    Type: Application
    Filed: October 28, 2016
    Publication date: May 4, 2017
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Masao Fukunaga, Ryosuke Shirota, Kazuya Nishio, Haruya Nakai
  • Publication number: 20170125790
    Abstract: Disclosed is a method for manufacturing a positive electrode including a positive electrode substrate made of aluminum foil and a positive electrode active material layer containing a positive electrode active material on the positive electrode substrate. This method includes the steps of stretching a first exposed region of the positive electrode substrate with a first stretching roller disposed upstream; stretching a second exposed region of the positive electrode substrate with a second stretching roller disposed downstream; and compressing the positive electrode active material layer with a pair of compression rollers.
    Type: Application
    Filed: October 28, 2016
    Publication date: May 4, 2017
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Masao Fukunaga, Ryosuke Shirota, Kazuya Nishio, Haruya Nakai
  • Patent number: 8277520
    Abstract: One aspect of the present invention pertains to a method for producing a negative electrode for a non-aqueous electrolyte secondary battery, which comprises a paste preparing step of kneading a mixture containing a negative electrode active material, a binder resin having a glass transition temperature within a range from 20 to 40° C. and a dispersion solvent to prepare a negative electrode material mixture paste, a paste applying step of applying the negative electrode material mixture paste controlled to a temperature which is at least 10° C. higher than the glass transition temperature of the binder resin on a current collector to form a coating film, a coating film drying step of drying the coating film to form a negative electrode precursor, and a rolling step of rolling the negative electrode precursor to prepare a negative electrode having a negative electrode material mixture layer.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: October 2, 2012
    Assignee: Panasonic Corporation
    Inventors: Toshihiro Inoue, Masao Fukunaga, Takafumi Oura
  • Patent number: 8142635
    Abstract: A capillary array includes a light detection portion, a sample supply portion, a buffer solution supply portion and a voltage application portion which are necessary functions for electrophoresis, thereby, when assembling the capillary array into an electrophoresis apparatus, the same can be immediately used. Accordingly, a capillary array is provided which can be easily incorporated into an electrophoresis apparatus.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: March 27, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Shimizu, Toshiaki Kita, Kiyoshi Tsukada, Akihiro Suzuki, Tomonari Morioka, Masaya Kojima, Ryoji Inaba, Daizo Tokinaga, Shuhei Yamamoto, Yoshiyuki Okishima, Masao Fukunaga, Takayasu Furukawa, Tomohiro Shoji
  • Patent number: 7931983
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: April 26, 2011
    Assignee: Panasonic Corporation
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20100288642
    Abstract: A capillary array includes a light detection portion, a sample supply portion, a buffer solution supply portion and a voltage application portion which are necessary functions for electrophoresis, thereby, when assembling the capillary array into an electrophoresis apparatus, the same can be immediately used. Accordingly, a capillary array is provided which can be easily incorporated into an electrophoresis apparatus.
    Type: Application
    Filed: July 26, 2010
    Publication date: November 18, 2010
    Inventors: Yasushi Shimizu, Toshiaki Kita, Kiyoshi Tsukada, Akihiro Suzuki, Tomonari Morioka, Masaya Kojima, Ryoji Inaba, Daizo Tokinaga, Shuhei Yamamoto, Yoshiyuki Okishima, Masao Fukunaga, Takayasu Furukawa, Tomohiro Shoji
  • Publication number: 20100227210
    Abstract: The present invention relates to a non-aqueous electrolyte secondary battery and a manufacturing method thereof. An object of the present invention is to obtain a non-aqueous electrolyte secondary battery that has an improved non-aqueous electrolyte impregnation ability into a flat wound electrode group that includes a porous insulating layer that contains inorganic oxide particles and a binder, little deterioration of charge/discharge cycle characteristics, high voltage discharge ability and favorable productivity. According to the present invention, in a non-aqueous electrolyte secondary battery 1 that includes a flat wound electrode group 2 and a battery case 9, the electrode group 2 including a positive electrode 5, a negative electrode 6, a separator 7 and a porous insulating layer 8, at least one crack is formed in the porous insulating layer 8 that lies at folded portions 2a of the electrode group 2.
    Type: Application
    Filed: June 2, 2009
    Publication date: September 9, 2010
    Inventors: Masao Fukunaga, Hajime Nishino
  • Patent number: 7785458
    Abstract: A capillary array includes a light detection portion, a sample supply portion, a buffer solution supply portion and a voltage application portion which are necessary functions for electrophoresis, thereby, when assembling the capillary array into an electrophoresis apparatus, the same can be immediately used. Accordingly, a capillary array is provided which can be easily incorporated into an electrophoresis apparatus.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: August 31, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Shimizu, Toshiaki Kita, Kiyoshi Tsukada, Akihiro Suzuki, Tomonari Morioka, Masaya Kojima, Ryoji Inaba, Daizo Tokinaga, Shuhei Yamamoto, Yoshiyuki Okishima, Masao Fukunaga, Takayasu Furukawa, Tomohiro Shoji
  • Patent number: 7767339
    Abstract: A method for producing a non-aqueous electrolyte secondary battery comprising the steps of: (i) mixing a positive electrode active material, a first binder A and a dispersion medium to prepare a paste A, the active material comprising a lithium-containing transition metal oxide; (ii) mixing a conductive agent, a second binder B and a dispersion medium to prepare a paste B, the conductive agent comprising carbon black; (iii) mixing the paste A and the paste B to prepare a positive electrode material paste C; (iv) applying the positive electrode material paste C onto a positive electrode core member and rolling and drying the resultant member to prepare a positive electrode; and (v) fabricating a battery using the positive electrode, a negative electrode and a non-aqueous electrolyte, wherein contact angle ?A between the non-aqueous electrolyte and the binder A and contact angle ?B between the non-aqueous electrolyte and the binder B satisfy the formula (1): ?B??A?15°.
    Type: Grant
    Filed: May 9, 2005
    Date of Patent: August 3, 2010
    Assignee: Panasonic Corporation
    Inventors: Kohei Suzuki, Masao Fukunaga, Toshihide Murata, Kazunori Kubota, Tsumoru Ohata
  • Patent number: 7758998
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: July 20, 2010
    Assignee: Panasonic Corporation
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Patent number: 7754377
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: July 13, 2010
    Assignee: Panasonic Corporation
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20100040940
    Abstract: An electrode in sheet form includes a current collector and an electrode mixture layer carried on each side thereof. The electrode is bent in the longitudinal direction thereof, to cause a large number of cracks in at least the electrode mixture layer to be positioned on the inner side of the current collector when wound, such that the cracks extend from the surface of the electrode mixture layer to the current collector in the direction intersecting with the longitudinal direction of the electrode. This bending process includes the steps of: bending the electrode at a curvature that is smaller than that of the winding core at least once; and thereafter bending the electrode at a curvature that is equal to or larger than that of the winding core. For example, this process is performed by arranging rollers such that their diameters decrease gradually and pressing the electrode against these rollers. This invention provides an electrode that does not break when wound to form an electrode assembly.
    Type: Application
    Filed: October 19, 2009
    Publication date: February 18, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Kozo WATANABE, Masao Fukunaga, Ichiro Yasuoka, Toshiro Kume
  • Patent number: 7662516
    Abstract: A method for manufacturing a positive electrode plate for a non-aqueous secondary battery including: preparing an active material A, a conductive material B, a binder C, a thickener D, and a liquid component E, the thickener D being in a powder state, the conductive material B including a carbon material, the thickener D including a water-soluble polymer, and the liquid component E including water; preparing a slurry including the component E and an electrode material mixture, the material mixture including the active material A, the conductive material B, the binder C, and the thickener D; and applying the slurry on a current collector. In preparing the slurry, the thickener D in a powder state, the active material A and the conductive material B are kneaded together with the liquid component E, and then the primary kneaded matter, the binder C, and an additional liquid component are kneaded.
    Type: Grant
    Filed: June 7, 2005
    Date of Patent: February 16, 2010
    Assignee: Panasonic Corporation
    Inventors: Masao Fukunaga, Kohei Suzuki, Katsumi Kashiwagi, Akira Kuroda, Yasuhiro Inadomi, Masanori Sumihara
  • Patent number: 7622218
    Abstract: An electrode in sheet form includes a current collector and an electrode mixture layer carried on each side thereof. The electrode is bent in the longitudinal direction thereof, to cause a large number of cracks in at least the electrode mixture layer to be positioned on the inner side of the current collector when wound, such that the cracks extend from the surface of the electrode mixture layer to the current collector in the direction intersecting with the longitudinal direction of the electrode. This bending process includes the steps of: bending the electrode at a curvature that is smaller than that of the winding core at least once; and thereafter bending the electrode at a curvature that is equal to or larger than that of the winding core. For example, this process is performed by arranging rollers such that their diameters decrease gradually and pressing the electrode against these rollers. This invention provides an electrode that does not break when wound to form an electrode assembly.
    Type: Grant
    Filed: April 6, 2006
    Date of Patent: November 24, 2009
    Assignee: Panasonic Corporation
    Inventors: Kozo Watanabe, Masao Fukunaga, Ichiro Yasuoka, Toshiro Kume