Patents by Inventor Kazuto Maeda

Kazuto Maeda 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: 11114729
    Abstract: An energy storage device including: an electrode assembly and a positive electrode current collector, wherein the positive electrode current collector includes an electrode connecting portion connected to the electrode assembly, the electrode connecting portion includes a first portion and a second portion which has a smaller wall thickness than the first portion and is joined to the electrode assembly, and either one of the second portion or the electrode assembly includes a first convex portion projecting toward the other in a joined portion.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: September 7, 2021
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Hirokazu Kambayashi, Kazuto Maeda
  • Publication number: 20210036299
    Abstract: An energy storage device includes: a case; an electrode terminal having a terminal body, a shaft, and a step disposed at the root of the shaft; and an upper insulating member disposed between the terminal body and the case. The upper insulating member has a terminal support part abutting on a terminal bottom surface of the step and a wall part facing the end face of the terminal body. On one of the terminal body and the upper insulating member, a convex part projecting toward the other of the terminal body and the upper insulating member is formed at a position between the step and the wall part. A gap is formed between the terminal body and the upper insulating member on the side of the convex part.
    Type: Application
    Filed: January 30, 2019
    Publication date: February 4, 2021
    Inventors: Kazuto MAEDA, Shohei YAMO
  • Patent number: 10833299
    Abstract: A sealing member (positive electrode first sealing member) disposed between a terminal (positive electrode terminal), which is provided on a case of an energy storage device, and the case or between a current collector (positive electrode current collector), which is electrically connected with the terminal, and the case. The sealing member includes a first surface (bottom surface) which faces the case and a second surface (bottom surface) which is opposite to the first surface and faces the terminal or the current collector. A first protrusion is formed on the first surface, the first protrusion surrounding a shaft portion of the terminal. A second protrusion is formed on the second surface, the second protrusion surrounding the shaft portion of the terminal. A protrusion amount of the first protrusion is different from a protrusion amount of the second protrusion.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: November 10, 2020
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Hirokazu Kambayashi, Kazuto Maeda
  • Publication number: 20200335738
    Abstract: An energy storage device includes: a case including a case body and a lid; and electrode terminals (positive electrode terminal, negative electrode terminal) fixed to the lid. A junction portion for joining the case body and the lid to each other is formed on a surface of the case on an electrode terminal side. The lid includes recessed portions disposed along and adjacent to the junction portion without being disposed between the electrode terminal and the junction portion.
    Type: Application
    Filed: November 29, 2018
    Publication date: October 22, 2020
    Inventors: Kazuto MAEDA, Hirokazu KAMBAYASHI
  • Patent number: 10797292
    Abstract: An energy storage device includes: an electrode assembly formed by stacking plates; and a first conductive member welded to one of both surfaces of a converged portion on an end portion of the electrode assembly without covering the converged portion from an end portion side, wherein a welding surface of a welded portion where the electrode assembly and the first conductive member are welded to each other is disposed at a position recessed from an outer surface of the first conductive member.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: October 6, 2020
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Hirokazu Kambayashi, Kazuto Maeda
  • Publication number: 20200273635
    Abstract: An energy storage device includes an electrode terminal including a plate-like terminal body and a shaft portion connected to the terminal body, and an upper insulating member disposed between the terminal body and the case, the upper insulating member having a through-hole through which the shaft portion penetrates. The upper insulating member has a sidewall portion disposed along an end surface of the terminal body. The sidewall portion is provided with a thin portion at a position on a side of a center point of the shaft portion in a direction orthogonal to an extending direction of the sidewall portion in a plan view.
    Type: Application
    Filed: September 14, 2018
    Publication date: August 27, 2020
    Inventors: Kazuto MAEDA, Shohei YAMAO
  • Patent number: 10644293
    Abstract: An energy storage device comprising: electrode terminals; an electrode assembly formed by stacking a positive electrode plate and a negative electrode plate; and current collectors which connect the electrode terminals and the electrode assembly to each other, wherein at least one of the positive electrode plate and the negative electrode plate has a plurality of tab groups which are joined to the current collector, each tab group being formed by stacking one or more tabs projecting toward the electrode terminal, and at least one tab group among the tab groups and the current collector has a swaged joint portion, the swaged joint portion projecting from either one of the tab group or the current collector to the other of the tab group or the current collector.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: May 5, 2020
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Kazuto Maeda, Hirokazu Kambayashi
  • Patent number: 10637010
    Abstract: In a method for manufacturing an energy storage device by applying welding to a container of the energy storage device, the method includes: arranging a jig on which wall surfaces are formed between two parts to be welded to which welding is applied; and welding the two parts to be welded while supplying a shield gas to the two parts to be welded from two different directions corresponding to the two parts to be welded.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: April 28, 2020
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Hirokazu Kambayashi, Kazuto Maeda
  • Patent number: 10601019
    Abstract: An energy storage device including: an electrode assembly having a body portion and a first tab portion projecting from the body portion; and a container housing the electrode assembly, wherein a first current collector electrically connected to the first tab portion or the first tab portion, and the container have a swaged joint portion having a concavo-convex structure projecting toward the other side from one side.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: March 24, 2020
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Kazuto Maeda, Hirokazu Kambayashi, Shohei Yamao
  • Patent number: 10593926
    Abstract: An energy storage device includes a positive electrode current collector and a negative electrode current collector which respectively have electric conductivity and are joined to each other, and cover members. The energy storage device includes swaged joint portions which join the positive electrode current collector and the cover members to each other, and are engaged with each other by fitting engagement by a concavo-convex fitting engagement structure which projects from the positive electrode current collector toward the cover members, and swaged joint portions which join the negative electrode current collector and the cover members to each other and, are engaged with each other by fitting engagement by a concavo-convex fitting engagement structure which projects from the negative electrode current collector toward the cover members. The cover members respectively include a strip-shaped projection which forms a rigidity changing part on the side of the swaged joint portion.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: March 17, 2020
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Kazuto Maeda, Hirokazu Kambayashi, Shohei Yamao
  • Patent number: 10381612
    Abstract: An energy storage device includes a first locking portion for locking a rotation of a positive electrode current collecting member about a shaft portion of a positive electrode terminal with respect to a lower insulating member. The first locking portion includes: a recessed portion formed on the lower insulating member; and a projecting portion formed on the positive electrode current collecting member. The recessed portion is indented away from the shaft portion in a direction which intersects with the shaft portion. The projecting portion projects away from the shaft portion in the direction which intersects with the shaft portion. The recessed portion and the projecting portion are configured to engage with each other. A leg portion is positioned closer to an end portion of a lid body in a longitudinal direction of the lid body than the first locking portion is.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: August 13, 2019
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Kazuto Maeda, Hirokazu Kambayashi
  • Publication number: 20190044105
    Abstract: A method for manufacturing an energy storage device includes a swaging step in which a swaged portion is formed by swaging a tip portion, penetrating a positive electrode terminal or a positive electrode current collector and projecting in a predetermined direction from the positive electrode terminal or the positive electrode current collector, of a shaft portion. In the swaging step, the tip portion of the shaft portion is swaged by a punch which includes a pressing surface, the pressing surface including a punch-side first concave portion which is concaved in the predetermined direction and a punch-side second concave portion which is concaved in the predetermined direction more than the punch-side first concave portion at an inner peripheral side of the punch-side first concave portion.
    Type: Application
    Filed: January 19, 2017
    Publication date: February 7, 2019
    Inventors: Kazuto MAEDA, Hirokazu KAMBAYASHI
  • Patent number: 10170767
    Abstract: Provided is an energy storage device which includes: an electrode assembly including a positive electrode and a negative electrode respectively including a non-coated region having a metal foil; current collectors each having a support portion which is made to overlap with the non-coated region; and opposedly facing supports each configured to clamp the non-coated region cooperatively with the support portion, wherein at least one of the non-coated region, the support portion and the opposedly facing support includes a conductive layer having non-oxidizing property or hardly-oxidizable property, the conductive layer covering at least one surface out of a surface of the non-coated region facing the support portion, a surface of the non-coated region facing the opposedly facing support, a surface of the support portion facing the non-coated region, and a surface of the opposedly facing support facing the non-coated region.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: January 1, 2019
    Assignee: GS YUASA INTERNATIONAL LTD.
    Inventors: Takeshi Sasaki, Hirokazu Kambayashi, Kazuto Maeda
  • Publication number: 20180375069
    Abstract: A sealing member (positive electrode first sealing member) disposed between a terminal (positive electrode terminal), which is provided on a case of an energy storage device, and the case or between a current collector (positive electrode current collector), which is electrically connected with the terminal, and the case. The sealing member includes a first surface (bottom surface) which faces the case and a second surface (bottom surface) which is opposite to the first surface and faces the terminal or the current collector. A first protrusion is formed on the first surface, the first protrusion surrounding a shaft portion of the terminal. A second protrusion is formed on the second surface, the second protrusion surrounding the shaft portion of the terminal. A protrusion amount of the first protrusion is different from a protrusion amount of the second protrusion.
    Type: Application
    Filed: December 28, 2016
    Publication date: December 27, 2018
    Inventors: Hirokazu KAMBAYASHI, Kazuto MAEDA
  • Publication number: 20180342723
    Abstract: An energy storage device including: an electrode assembly and a positive electrode current collector, wherein the positive electrode current collector includes an electrode connecting portion connected to the electrode assembly, the electrode connecting portion includes a first portion and a second portion which has a smaller wall thickness than the first portion and is joined to the electrode assembly, and either one of the second portion or the electrode assembly includes a first convex portion projecting toward the other in a joined portion.
    Type: Application
    Filed: September 27, 2016
    Publication date: November 29, 2018
    Inventors: Hirokazu KAMBAYASHI, Kazuto MAEDA
  • Publication number: 20180287124
    Abstract: An energy storage device includes: an electrode assembly formed by stacking plates; and a first conductive member welded to one of both surfaces of a converged portion on an end portion of the electrode assembly without covering the converged portion from an end portion side, wherein a welding surface of a welded portion where the electrode assembly and the first conductive member are welded to each other is disposed at a position recessed from an outer surface of the first conductive member.
    Type: Application
    Filed: September 27, 2016
    Publication date: October 4, 2018
    Inventors: Hirokazu KAMBAYASHI, Kazuto MAEDA
  • Publication number: 20180183018
    Abstract: An energy storage device includes: an electrode assembly; a container that includes a wall portion and accommodates the electrode assembly; a first conductive member; a second conductive member electrically connected to the electrode assembly and connected to the first conductive member and is arranged to pass through the wall portion; and a sealing member that is nonmetallic and disposed between the first conductive member and the second conductive member. The first conductive member and the second conductive member are in direct contact and are made of mutually different metal materials. The sealing member is disposed at a contact interface of the first conductive member and the second conductive member.
    Type: Application
    Filed: December 22, 2017
    Publication date: June 28, 2018
    Inventors: Kazuto MAEDA, Hirokazu KAMBAYASHI
  • Publication number: 20180097208
    Abstract: An energy storage device includes a first locking portion for locking a rotation of a positive electrode current collecting member about a shaft portion of a positive electrode terminal with respect to a lower insulating member. The first locking portion includes: a recessed portion formed on the lower insulating member; and a projecting portion formed on the positive electrode current collecting member. The recessed portion is indented away from the shaft portion in a direction which intersects with the shaft portion. The projecting portion projects away from the shaft portion in the direction which intersects with the shaft portion. The recessed portion and the projecting portion are configured to engage with each other. A leg portion is positioned closer to an end portion of a lid body in a longitudinal direction of the lid body than the first locking portion is.
    Type: Application
    Filed: September 11, 2017
    Publication date: April 5, 2018
    Inventors: Kazuto MAEDA, Hirokazu KAMBAYASHI
  • Publication number: 20180069227
    Abstract: An energy storage device including: an electrode assembly having a body portion and a first tab portion projecting from the body portion; and a container housing the electrode assembly, wherein a first current collector electrically connected to the first tab portion or the first tab portion, and the container have a swaged joint portion having a concavo-convex structure projecting toward the other side from one side.
    Type: Application
    Filed: September 6, 2017
    Publication date: March 8, 2018
    Inventors: Kazuto MAEDA, Hirokazu KAMBAYASHI, Shohei YAMAO
  • Publication number: 20180006276
    Abstract: In a method for manufacturing an energy storage device by applying welding to a container of the energy storage device, the method includes: arranging a jig on which wall surfaces are formed between two parts to be welded to which welding is applied; and welding the two parts to be welded while supplying a shield gas to the two parts to be welded from two different directions corresponding to the two parts to be welded.
    Type: Application
    Filed: March 29, 2016
    Publication date: January 4, 2018
    Inventors: Hirokazu KAMBAYASHI, Kazuto MAEDA