Patents by Inventor Yasutaka Kogetsu

Yasutaka Kogetsu 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: 10566598
    Abstract: A winding-type battery includes an electrode group that is formed by winding a first electrode and a second electrode via a separator and has a first end surface and a second end surface. The first electrode includes a first current collector sheet, and a first active material layer formed on its surface. The second electrode includes a second current collector sheet, and a second active material layer formed on its surface. The first current collector sheet includes, at its end disposed on the first end surface of the electrode group, a first uncoated portion having no first active material layer on either surface thereof. An edge surface of the first uncoated portion is at least partially covered with an insulating layer, and an end of the insulating layer projects more than an end of the separator on the first end surface.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: February 18, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yasutaka Kogetsu, Sadayuki Okazaki, Katsuhisa Wadasaki, Yuki Suehiro
  • Patent number: 10305077
    Abstract: A small cylindrical lithium-ion secondary battery provided with a safety mechanism that enables internal pressure to be released when an anomaly occurs. The battery includes an electrode group formed of a positive electrode and a negative electrode that are wound or stacked with a separator interposed therebetween, an electrolytic solution, a battery case that contains the electrode group and the electrolytic solution, and a sealing body. The battery case has an outer diameter of 10 mm or less. The sealing body includes a ring having a through-hole and includes a sheet-like or film-like valve member disposed such that the valve member covers the through-hole of the ring, and a safety mechanism that causes the valve member to cleave when the internal pressure reaches a predetermined pressure is disposed therein. The ring includes protrusions formed of linear ridge lines that protrude toward an inside of the through-hole.
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: May 28, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MGMT CO., LTD.
    Inventors: Noriyuki Uchida, Yasutaka Kogetsu, Koki Inoue, Tsutomu Nishioka
  • Publication number: 20180342724
    Abstract: A battery includes: an electrode group including a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode; an electrolyte; a container for accommodating the electrode group and the electrolyte; a sealing member for blocking an opening in the container; and a first lead for electrically connecting the first electrode to the sealing member. The first lead has a weld region welded to the sealing member, and the weld region has at least one first bump along the longitudinal direction of the first lead. The cross section of the boundary between the weld region and a non-weld region on the first electrode side has a projecting shape corresponding to the bump.
    Type: Application
    Filed: November 21, 2016
    Publication date: November 29, 2018
    Inventors: SADAYUKI OKAZAKI, YASUTAKA KOGETSU, KATSUHISA WADASAKI, SUGURU MATSUMURA
  • Publication number: 20180183109
    Abstract: A winding-type battery includes a battery case, a power generating element, a cap for blocking an opening of the battery case, and a gasket for insulating the battery case from the cap. The first electrode is connected to the cap via a first current collecting lead, and the second electrode is connected to the battery case via a second current collecting lead. A groove is formed near the opening end of the battery case. The gasket includes: an annular seal portion interposed between a rim of the cap and the region from the groove to the end; and a tubular portion that is integrated with the seal portion, and is disposed closer to the electrode group than the seal portion is. The first current collecting lead is connected to the cap through a hollow in the tubular portion.
    Type: Application
    Filed: July 19, 2016
    Publication date: June 28, 2018
    Inventors: TERUHISA MIURA, KOKI INOUE, AKIRA KAKINUMA, KATSUHISA WADASAKI, YASUTAKA KOGETSU, YUKI SUEHIRO
  • Publication number: 20180145304
    Abstract: A winding-type battery includes an electrode group that is formed by winding a first electrode and a second electrode via a separator and has a first end surface and a second end surface. The first electrode includes a first current collector sheet, and a first active material layer formed on its surface. The second electrode includes a second current collector sheet, and a second active material layer formed on its surface. The first current collector sheet includes, at its end disposed on the first end surface of the electrode group, a first uncoated portion having no first active material layer on either surface thereof. An edge surface of the first uncoated portion is at least partially covered with an insulating layer, and an end of the insulating layer projects more than an end of the separator on the first end surface.
    Type: Application
    Filed: June 15, 2016
    Publication date: May 24, 2018
    Inventors: YASUTAKA KOGETSU, SADAYUKI OKAZAKI, KATSUHISA WADASAKI, YUKI SUEHIRO
  • Publication number: 20170141370
    Abstract: A small cylindrical lithium-ion secondary battery provided with a safety mechanism that enables internal pressure to be released when an anomaly occurs. The battery includes an electrode group formed of a positive electrode and a negative electrode that are wound or stacked with a separator interposed therebetween, an electrolytic solution, a battery case that contains the electrode group and the electrolytic solution, and a sealing body. The battery case has an outer diameter of 10 mm or less. The sealing body includes a ring having a through-hole and includes a sheet-like or film-like valve member disposed such that the valve member covers the through-hole of the ring, and a safety mechanism that causes the valve member to cleave when the internal pressure reaches a predetermined pressure is disposed therein. The ring includes protrusions formed of linear ridge lines that protrude toward an inside of the through-hole.
    Type: Application
    Filed: May 27, 2015
    Publication date: May 18, 2017
    Applicant: PANASONIC INTELLECTUAL PROPERTY MGMT CO., LTD.
    Inventors: Noriyuki Uchida, Yasutaka Kogetsu, Koki Inoue, Tsutomu Nishioka
  • Patent number: 9620768
    Abstract: A negative electrode 1 for lithium secondary batteries, which can increase the charge/discharge capacity of a lithium secondary battery, includes a negative electrode current collector, a negative electrode active material layer, and a lithium layer. The negative electrode active material layer is disposed on regions and of the respective surfaces and of the negative electrode current collector. The lithium layer is disposed on uncovered regions and, which are regions of the respective surfaces and of the negative electrode current collector on which the negative electrode active material layer is not disposed. The lithium layer includes lithium.
    Type: Grant
    Filed: May 20, 2013
    Date of Patent: April 11, 2017
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Yasutaka Kogetsu, Kunihiko Bessho, Takashi Shimada
  • Publication number: 20150147656
    Abstract: A negative electrode 1 for lithium secondary batteries, which can increase the charge/discharge capacity of a lithium secondary battery, includes a negative electrode current collector, a negative electrode active material layer, and a lithium layer. The negative electrode active material layer is disposed on regions and of the respective surfaces and of the negative electrode current collector. The lithium layer is disposed on uncovered regions and, which are regions of the respective surfaces and of the negative electrode current collector on which the negative electrode active material layer is not disposed. The lithium layer includes lithium.
    Type: Application
    Filed: May 20, 2013
    Publication date: May 28, 2015
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Yasutaka Kogetsu, Kunihiko Bessho, Takashi Shimada
  • Patent number: 9023530
    Abstract: To improve high temperature storage characteristic of a non-aqueous electrolyte secondary battery suitable for high input/output application, the structure of a positive electrode active material is optimized. The non-aqueous electrolyte secondary battery includes a positive electrode; a negative electrode; a separator interposed between the positive and negative electrodes; and a non-aqueous electrolyte. The positive electrode active material includes secondary particles, each formed of an aggregate of primary particles. A value (VPr) defined by the formula: VPr=(1?C/D)/(A2×B3) is not less than 0.0005 and not greater than 0.04, where an average particle size of the primary particles is A ?m, an average particle size of the positive electrode active material is B ?m, a tap density of the positive electrode active material is C g/ml, and a true specific gravity of the positive electrode active material is D g/ml.
    Type: Grant
    Filed: March 9, 2006
    Date of Patent: May 5, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takaya Saito, Yasutaka Kogetsu, Takashi Takeuchi, Hidekazu Hiratsuka
  • Patent number: 8986882
    Abstract: The present invention relates to a current collector including a base portion with a flat face, primary projections projecting from the flat face, and secondary projections projecting from the top of the primary projections. The present invention also relates to a current collector including a base portion with a flat face and primary projections projecting from the flat face, wherein the roughening rate of the top of the primary projections is 3 to 20. By using such a current collector, separation of the active material from the current collector can be inhibited when using an active material that has a high capacity but undergoes a large expansion at the time of lithium ion absorption.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: March 24, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Shuji Ito, Yasutaka Kogetsu, Kazuya Iwamoto, Kazuyoshi Honda, Taisuke Yamamoto, Yasuhiro Ueyama, Keisuke Ohara, Hitoshi Katayama
  • Patent number: 8888870
    Abstract: In order to enhance charge and discharge efficiency and to improve cycle characteristics by increasing a facing area between a positive electrode active material and a negative electrode active material, in a negative electrode for lithium secondary battery having a current collector and an active material layer carried on the current collector, the active material layer includes a plurality of columnar particles. The columnar particles include an element of silicon, and are tilted toward the normal direction of the current collector. Angle ? formed between the columnar particles and the normal direction of the current collector is preferably 10°??<90°.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: November 18, 2014
    Assignee: Panasonic Corporation
    Inventors: Yasutaka Kogetsu, Masaya Ugaji, Keiichi Takahashi, Shinji Mino, Nobuaki Nagao, Satoshi Shibutani, Kazuyoshi Honda
  • Patent number: 8771874
    Abstract: The negative electrode for a lithium secondary battery includes: a current collector 11 having a plurality of bumps 11a on a surface thereof; a first active material layer formed on the current collector 11; and a second active material layer 15 disposed on the first active material layer 12 and including a plurality of active material particles 14. Each of the plurality of active material particles 14 is located on a corresponding bump 11a of the current collector 11, and each of the first active material layer 12 and the plurality of active material particles 14 has a chemical composition represented as SiOx (0<x<1).
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: July 8, 2014
    Assignee: Panasonic Corporation
    Inventors: Taisuke Yamamoto, Kazuya Iwamoto, Yasutaka Kogetsu
  • Patent number: 8399129
    Abstract: A negative electrode for a lithium secondary battery of the present invention includes a current collector and a negative electrode active material layer carried on the current collector. The negative electrode active material layer includes a plurality of columnar particles. The current collector has a surface including a depression and a plurality of projected regions defined by the depression. The projected regions carry the columnar particles. Further, the present invention relates to a lithium secondary battery using the foregoing negative electrode. According to the present invention, it is possible to provide a high-capacity negative electrode excellent mainly in cycle characteristics for a lithium secondary battery, and a lithium secondary battery including the same.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: March 19, 2013
    Assignee: Panasonic Corporation
    Inventors: Masaya Ugaji, Masaki Hasegawa, Taisuke Yamamoto, Keisuke Ohara, Yasutaka Kogetsu, Takuhiro Nishimura
  • Patent number: 8389156
    Abstract: This invention provides a negative electrode and a non-aqueous electrolyte secondary battery including the negative electrode. The negative electrode includes a Li-absorbing element as a negative electrode active material, is free from deformation, separation of the negative electrode active material layer from the negative electrode current collector, and deposition of lithium on the negative electrode current collector, and is excellent in cycle characteristic, large-current discharge characteristic, and low-temperature discharge characteristic. The negative electrode of this invention includes: a current collector having depressions and protrusions on a surface in the thickness direction thereof; and a negative electrode active material layer that includes a plurality of columns containing a negative electrode active material that absorbs and releases lithium ions, the columns being grown outwardly from the surface of the current collector.
    Type: Grant
    Filed: August 22, 2007
    Date of Patent: March 5, 2013
    Assignee: Panasonic Corporation
    Inventors: Katsumi Kashiwagi, Kazuyoshi Honda, Masaki Hasegawa, Masaya Ugaji, Yasutaka Kogetsu, Shuji Ito
  • Patent number: 8318359
    Abstract: An electrode for a lithium secondary battery including a sheet-like current collector and an active material layer carried on the current collector. The active material layer is capable of absorbing and desorbing lithium, and the active material layer includes a plurality of columnar particles having at least one bend. An angle ?1 formed by a growth direction of the columnar particles from a bottom to a first bend of the columnar particles, and a direction normal to the current collector is preferably 10° or more and less than 90°. When ?n+1 is an angle formed by a growth direction of the columnar particles from an n-th bend counted from a bottom of the columnar particles to an (n+1)-th bend, and the direction normal to the current collector, and n is an integer of 1 or more, ?n+1 is preferably 0° or more and less than 90°.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: November 27, 2012
    Assignee: Panasonic Corporation
    Inventors: Keiichi Takahashi, Masaya Ugaji, Yasutaka Kogetsu, Shinji Mino, Nobuaki Nagao, Masaki Hasegawa
  • Patent number: 8303672
    Abstract: An electrode for a lithium secondary battery including a sheet-like current collector and an active material layer carried on the current collector. The active material layer is capable of absorbing and desorbing lithium, and the active material layer includes a plurality of columnar particles having at least one bend. An angle ?1 formed by a growth direction of the columnar particles from a bottom to a first bend of the columnar particles, and a direction normal to the current collector is preferably 10° or more and less than 90°. When ?n+1 is an angle formed by a growth direction of the columnar particles from an n-th bend counted from a bottom of the columnar particles to an (n+1)-th bend, and the direction normal to the current collector, and n is an integer of 1 or more, ?n+1 is preferably 0° or more and less than 90°.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: November 6, 2012
    Assignee: Panasonic Corporation
    Inventors: Keiichi Takahashi, Masaya Ugaji, Yasutaka Kogetsu, Shinji Mino, Nobuaki Nagao, Masaki Hasegawa
  • Patent number: 8236454
    Abstract: A negative electrode for a lithium ion secondary battery of the present invention includes a sheet-like current collector and an active material layer carried on the current collector. The current collector includes a substrate and a surface portion that undergoes plastic deformation more easily than the substrate. The surface portion has protrusions and recesses. The active material layer includes a plurality of columnar particles containing silicon. The columnar particles are carried on the surface portion.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: August 7, 2012
    Assignee: Panasonic Corporation
    Inventors: Yasutaka Kogetsu, Shuji Ito
  • Patent number: 8182945
    Abstract: A current collector includes a substrate, a plurality of projections formed on a first portion of the substrate, and at least two adjacent minute projections formed on a second portion of the substrate. The substrate is a metal sheet. The first and second portions are formed on the surface of the substrate. The second portion includes 2 to 100 of minute projections. The minute projections have a height of below 35% of the average height of the plurality of projections. By forming an electrode active material layer on the face of the current collector where the plurality of projections are formed to make an electrode, the detachment of the electrode active material layer, and the spread of the detachment are significantly curbed.
    Type: Grant
    Filed: July 3, 2008
    Date of Patent: May 22, 2012
    Assignee: Panasonic Corporation
    Inventors: Yasutaka Kogetsu, Tatsuki Hiraoka, Takuhiro Nishimura
  • Publication number: 20120088136
    Abstract: Disclosed is a non-aqueous electrolyte secondary battery including: a cylindrical wound electrode group including a belt-like negative electrode, a belt-like positive electrode, and a belt-like separator interposed therebetween, the electrodes and separator being laminated and wound together; and a non-aqueous electrolyte. The cross section perpendicular to the winding axis of the electrode group has a radius of 3 mm or more. The negative electrode includes a current collector, an active material layer including a silicon-based active material and adhering to the surface of the current collector, and a strip-like lead connected to the current collector via an alloy layer comprising a copper-silicon alloy. The lead is connected at the round of winding radially 3 mm or more away from the winding axis of the electrode group, and includes a copper foil or copper alloy foil having a tensile strength per unit length of the short side width thereof of 3 N/mm to 50 N/mm.
    Type: Application
    Filed: September 14, 2011
    Publication date: April 12, 2012
    Inventors: Yasutaka KOGETSU, Hitoshi Katayama
  • Publication number: 20120027919
    Abstract: An electrode for a lithium secondary battery including a sheet-like current collector and an active material layer carried on the current collector. The active material layer is capable of absorbing and desorbing lithium, and the active material layer includes a plurality of columnar particles having at least one bend. An angle ?1 formed by a growth direction of the columnar particles from a bottom to a first bend of the columnar particles, and a direction normal to the current collector is preferably 10° or more and less than 90°. When ?n+1 is an angle formed by a growth direction of the columnar particles from an n-th bend counted from a bottom of the columnar particles to an (n+1)-th bend, and the direction normal to the current collector, and n is an integer of 1 or more, ?n+1 is preferably 0° or more and less than 90°.
    Type: Application
    Filed: September 29, 2011
    Publication date: February 2, 2012
    Applicant: Panasonic Corporation
    Inventors: Keiichi TAKAHASHI, Masaya UGAJI, Yasutaka KOGETSU, Shinji MINO, Nobuaki NAGAO, Masaki HASEGAWA