Patents by Inventor Kazuya Mimura

Kazuya Mimura 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).

  • Publication number: 20210210761
    Abstract: An electrode comprising an active material layer comprising an active material and a first resin, the active material layer being formed on at least one surface of a current collector, and an active material layer non-formation portion having no active material layer formed thereon, wherein a boundary between the active material layer and the active material layer non-formation portion is covered with an insulating layer, and the insulating layer comprises a third resin; and a heat resistant layer covering the surface of the active material layer is formed, the heat resistant layer overlaps with the insulating layer at an end portion of the active material layer, and the heat resistant layer comprises a fourth resin.
    Type: Application
    Filed: March 6, 2017
    Publication date: July 8, 2021
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Kazuya MIMURA
  • Publication number: 20200212424
    Abstract: An electrode includes a current collector, an active material layer, a first layer including first particles, and a second layer including second particles, wherein an average cross-sectional area of the first particles in a plane substantially parallel to the electrode surface is smaller than an average cross-sectional area of the second particles in a plane substantially parallel to the electrode surface.
    Type: Application
    Filed: September 6, 2018
    Publication date: July 2, 2020
    Applicant: Envision AESC Energy Devices Ltd.
    Inventors: Junpei MORITA, Kazuya MIMURA
  • Publication number: 20200067081
    Abstract: An electrode for an electrochemical device has a coated portion in which an active material layer is formed on a current collector; a non-coated portion in which the active material layer is not formed; and a resin layer that is laminated such that the coated portion and a portion of the non-coated portion are covered; wherein: the resin layer has a high-permeability portion having high ion permeability and positioned on the coated portion; a low-permeability portion having low ion permeability and positioned on a portion of the non-coated portion; and a transition portion in which ion permeability decreases from the high-permeability portion side toward the low-permeability portion side and positioned between the high-permeability portion and the low-permeability portion.
    Type: Application
    Filed: October 31, 2017
    Publication date: February 27, 2020
    Applicant: Envision AESC Energy Devices Ltd.
    Inventors: Masanori HIRAI, Kazuya MIMURA
  • Patent number: 9876257
    Abstract: Secondary battery includes a battery assembly configured by alternately stacking positive electrodes 1 and negative electrodes 6 via separators 20, in which the positive electrode and the negative electrode respectively include collectors 3 and 8, and active materials 2 and 7 applied on the collectors. On each surface of the collector, a coated portion coated with the active material and an uncoated portion not coated with any active material are provided. In one or both of the positive electrode and the negative electrode, boundary portion 4a between the coated portion and the uncoated portion on the front surface of the collector, is positioned planarly away from boundary portion 4b between the coated portion and the uncoated portion on the rear surface of the collector.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: January 23, 2018
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventor: Kazuya Mimura
  • Publication number: 20170288201
    Abstract: Secondary battery includes a battery assembly configured by alternately stacking positive electrodes 1 and negative electrodes 6 via separators 20, in which the positive electrode and the negative electrode respectively include collectors 3 and 8, and active materials 2 and 7 applied on the collectors. On each surface of the collector, a coated portion coated with the active material and an uncoated portion not coated with any active material are provided. In one or both of the positive electrode and the negative electrode, boundary portion 4a between the coated portion and the uncoated portion on the front surface of the collector, is positioned planarly away from boundary portion 4b between the coated portion and the uncoated portion on the rear surface of the collector.
    Type: Application
    Filed: June 21, 2017
    Publication date: October 5, 2017
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Kazuya MIMURA
  • Publication number: 20160141721
    Abstract: Secondary battery includes a battery assembly configured by alternately stacking positive electrodes 1 and negative electrodes 6 via separators 20, in which the positive electrode and the negative electrode respectively include collectors 3 and 8, and active materials 2 and 7 applied on the collectors. On each surface of the collector, a coated portion coated with the active material and an uncoated portion not coated with any active material are provided. In one or both of the positive electrode and the negative electrode, boundary portion 4a between the coated portion and the uncoated portion on the front surface of the collector, is positioned planarly away from boundary portion 4b between the coated portion and the uncoated portion on the rear surface of the collector.
    Type: Application
    Filed: December 10, 2013
    Publication date: May 19, 2016
    Applicant: NEC Energy Devices, Ltd.
    Inventor: Kazuya MIMURA
  • Patent number: 7981548
    Abstract: A multilayer secondary battery including a positive electrode having an active substance layer formed on a flat sheet-form collector and a negative electrode having an active substance layer formed on a flat sheet-form collector stacked together in opposite relation via a separator. The positive electrode active substance layer differs in area from the negative electrode active substance layer. Active substance-free portions with no active substance layer coated thereon are formed on sides of the outer periphery of a collector of the electrode having the smaller active substance layer. The surface of the collectors at the active substance-free portions is covered with an insulating layer. The end face of the insulating layer facing away from a side contiguous to an active substance layer and the end face of the electrode having a larger active substance layer area are stacked together on the same plane that intersects vertically an electrode plane.
    Type: Grant
    Filed: January 26, 2006
    Date of Patent: July 19, 2011
    Assignee: NEC Energy Devices, Ltd.
    Inventor: Kazuya Mimura
  • Publication number: 20060172185
    Abstract: The invention provides a multilayer secondary battery in which a positive electrode having a positive electrode active substance layer formed on a flat sheet-form collector and a negative electrode having a negative electrode active substance layer formed on a flat sheet-form collector are stacked together in opposite relation via a separator. The positive electrode active substance layer differs in area from the negative electrode active substance layer. Active substance-free portions with no active substance layer coated on them are formed on at least adjoining two sides of the outer periphery of a collector of a smaller area electrode having a smaller active substance layer area. The surface of the collectors at the active substance-free portions is covered with an insulating substance layer.
    Type: Application
    Filed: January 26, 2006
    Publication date: August 3, 2006
    Inventor: Kazuya Mimura
  • Patent number: 6870725
    Abstract: An electric double layer capacitor, including at least one basic cell, an electrode plate, and an outer package which covers the basic cell and the electrode plate in a decompression state. The basic cell may be laminated in its thickness direction to form a layered cell and includes a separator, a pair of polarized electrodes disposed so as to sandwich the separator, a pair of collectors disposed so as to sandwich the polarized electrodes, and a gasket disposed between the pair of collectors so as to surround the pair of polarized electrodes. The electrode plate body is attached to each of the collectors located at the outermost side in a laminated direction of the layered cell. A sealing material having a higher gas barrier property than the collectors is disposed so as to seal an interface between the collectors and the electrode plate in the outer package.
    Type: Grant
    Filed: July 7, 2003
    Date of Patent: March 22, 2005
    Assignee: NEC Tokin Corporation
    Inventors: Koji Sakata, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe
  • Publication number: 20040066604
    Abstract: An electric double layer capacitor, including at least one basic cell, an electrode plate, and an outer package which covers the basic cell and the electrode plate in a decompression state. The basic cell may be laminated in its thickness direction to form a layered cell and includes a separator, a pair of polarized electrodes disposed so as to sandwich the separator, a pair of collectors disposed so as to sandwich the polarized electrodes, and a gasket disposed between the pair of collectors so as to surround the pair of polarized electrodes. The electrode plate body is attached to each of the collectors located at the outermost side in a laminated direction of the layered cell. A sealing material having a higher gas barrier property than the collectors is disposed so as to seal an interface between the collectors and the electrode plate in the outer package.
    Type: Application
    Filed: July 7, 2003
    Publication date: April 8, 2004
    Applicant: NEC TOKIN CORPORATION
    Inventors: Koji Sakata, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe
  • Patent number: 6671165
    Abstract: A separator, a pair of polarized electrodes, gaskets holding the separator and the polarized electrodes from their sides, and a pair of the collectors provided in contact with the outer surfaces of polarized electrodes and gaskets are provided in an electric double layer capacitor. The collectors are a lamination having a conductive film formed by coating a conductive resin solution containing a conductive material to at least one surface of copper foil.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: December 30, 2003
    Assignee: NEC Tokin Corporation
    Inventors: Yutaka Nakazawa, Koji Sakata, Kazuya Mimura, Takashi Yasuda
  • Patent number: 6636417
    Abstract: An electric double layer capacitor, including at least one basic cell, an electrode plate, and an outer package which covers the basic cell and the electrode plate in a decompression state. The basic cell may be laminated in its thickness direction to form a layered cell and includes a separator, a pair of polarized electrodes disposed so as to sandwich the separator, a pair of collectors disposed so as to sandwich the polarized electrodes, and a gasket disposed between the pair of collectors so as to surround the pair of polarized electrodes. The electrode plate body is attached to each of the collectors located at the outermost side in a laminated direction of the layered cell. A sealing material having a higher gas barrier property than the collectors is disposed so as to seal an interface between the collectors and the electrode plate in the outer package.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: October 21, 2003
    Assignee: NEC Tokin Corporation
    Inventors: Koji Sakata, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe
  • Patent number: 6392868
    Abstract: An electric double-layer capacitor has a pair of thrust plates for thrusting a stacked cell pair and a gasket for encapsulating the stacked cell pair together with the thrust plates. The thrust plate has slanted side surfaces for effecting a close contact with a packaging overcoat. The thrust plates and the mounting gasket are coupled together by an interdigitaion relationship.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: May 21, 2002
    Assignee: NEC Corporation
    Inventors: Masako Ohya, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe, Satoshi Arai, Takashi Yasuda, Toshihisa Nagasawa, Koji Sakata, Mitsuru Ogawa
  • Patent number: 6341058
    Abstract: The present invention provides an electric double layer capacitor having a pail of polarized electrodes separated by a separator, the polarized electrodes having surfaces facing to the separator, wherein substantially entire parts of the surfaces of the polarized electrodes are spaced from the separator to form inner spaces between the polarized electrodes and the separator.
    Type: Grant
    Filed: March 30, 2000
    Date of Patent: January 22, 2002
    Assignee: NEC Corporation
    Inventors: Koji Sakata, Kazuya Mimura, Yutaka Nakazawa
  • Publication number: 20020006546
    Abstract: An electric double layer capacitor, including at least one basic cell, an electrode plate, and an outer package which covers the basic cell and the electrode plate in a decompression state. The basic cell may be laminated in its thickness direction to form a layered cell and includes a separator, a pair of polarized electrodes disposed so as to sandwich the separator, a pair of collectors disposed so as to sandwich the polarized electrodes, and a gasket disposed between the pair of collectors so as to surround the pair of polarized electrodes. The electrode plate body is attached to each of the collectors located at the outermost side in a laminated direction of the layered cell. A sealing material having a higher gas barrier property than the collectors is disposed so as to seal an interface between the collectors and the electrode plate in the outer package.
    Type: Application
    Filed: May 23, 2001
    Publication date: January 17, 2002
    Applicant: NEC CORPORATION
    Inventors: Koji Sakata, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe
  • Publication number: 20010021097
    Abstract: An electric double-layer capacitor has a pair of thrust plates for thrusting a stacked cell pair and a gasket for encapsulating the stacked cell pair together with the thrust plates. The thrust plate has slanted side surfaces for effecting a close contact with a packaging overcoat. The thrust plates and the mounting gasket are coupled together by an interdigitaion relationship.
    Type: Application
    Filed: February 26, 2001
    Publication date: September 13, 2001
    Inventors: Masako Ohya, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe, Satoshi Arai, Takashi Yasuda, Toshihisa Nagasawa, Koji Sakata, Mitsuru Ogawa
  • Patent number: 6288888
    Abstract: In an electric double layer capacitor having a pair of polarizable electrodes containing activated carbon and auxiliary materials for giving electric conductivity to the polarizable electrodes, the auxiliary materials include at least two carbon materials such as epitaxially grown carbon fiber and granular graphite. An electric double layer capacitor having small internal resistance, large electrostatic capacitance and small variations of internal resistance and capacitance is realized by the auxiliary materials.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: September 11, 2001
    Assignee: NEC Corporation
    Inventors: Koji Sakata, Gaku Harada, Kazuya Mimura, Yutaka Nakazawa
  • Patent number: 6040975
    Abstract: Tantalum powder and solid electrolytic capacitor using the same are disclosed. Cohered powder or Low CV powder is added to High CV powder in order to noticeably enhance an anchor effect during molding and therefore to increase the mechanical strength of a molding. Further, the addition of powder cohered beforehand prevents a contraction ratio from increasing at the time of sintering and thereby prevents the cavity distribution of an anode body from increasing, so that the electrical characteristic is improved.
    Type: Grant
    Filed: June 26, 1998
    Date of Patent: March 21, 2000
    Assignee: NEC Corporation
    Inventor: Kazuya Mimura