Patents by Inventor Haruya Nakai

Haruya Nakai 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: 11145865
    Abstract: A nonaqueous electrolyte secondary battery includes a first electrode plate including a core plate and an active material layer including an active material and a binder, and disposed on a surface of the core plate; a second electrode plate; and a nonaqueous electrolyte. When the surface of the active material layer in contact with the core plate is taken as zero point, the amount of the binder in a 0%-10% thickness region X is 8.5 to 9.5 mass % of the total amount of the binder in the active material layer, the amount of the binder in a 90%-100% thickness region Y is 9.5 to 11.5 mass % of the total amount of the binder in the active material layer, and a binder-richest portion across the thickness of the active material layer resides in a 55%-100% thickness region across the thickness of the active material layer.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: October 12, 2021
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Naoki Uchida, Ayumi Kochi, Haruya Nakai
  • Patent number: 11094922
    Abstract: A negative electrode active material slurry is applied to one surface of a strip-shaped negative electrode core so as to form multiple lines of the negative electrode active material slurry, the lines extending in an X direction and being spaced from each other in a Y direction. Subsequently, while keeping the negative electrode core aloft, first hot air is blown toward the negative electrode core from at least a lower side in a vertical direction, and then, while keeping the negative electrode core aloft, first cooling air having a lower temperature than the first hot air is blown toward the negative electrode core from at least the lower side in the vertical direction so as to decrease the temperature of the negative electrode core to 40° C. or lower.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: August 17, 2021
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Hidemasa Kawai, Koichi Katayama, Haruya Nakai
  • Patent number: 11081700
    Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes a negative electrode including a negative electrode core and negative electrode mixture layers formed on both surfaces of the negative electrode core. Each of the negative electrode mixture layers contains a cellulose-based binder composed of at least one of carboxymethyl cellulose and a salt thereof. When each of the negative electrode mixture layers is divided in half, at the center in the thickness direction, into a first region near the negative electrode core and a second region far from the negative electrode core, the content of the cellulose-based binder present in the first region is 35% by mass or more and less than 50% by mass of the total mass of the cellulose-based binder contained in the entire of each of the negative electrode mixture layers.
    Type: Grant
    Filed: August 26, 2019
    Date of Patent: August 3, 2021
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Naoki Uchida, Haruya Nakai, Ayumi Kochi
  • Patent number: 11038163
    Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode plate having a positive electrode active material layer formed on a positive electrode core, a negative electrode plate having a negative electrode active material layer formed on a negative electrode core, and a flat-shape wound electrode body in which the positive electrode plate and the negative electrode plate are wound through a separator. Further, a protective layer is formed on the positive electrode active material layer or the negative electrode active material layer. The protective layer contains ceramic particles and a binder, and the average particle diameter (D50) and the average particle diameter (D90) of the ceramic particles are 1.0 ?m to 1.8 ?m and 3.0 ?m to 5.0 ?m, respectively.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: June 15, 2021
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Tetsuya Matsuda, Haruya Nakai
  • Publication number: 20200274150
    Abstract: A negative electrode includes a negative electrode protecting layer that is disposed so as to cover a negative electrode active material layer formed on at least one surface of a negative electrode core in a thickness direction and that has higher electrical resistance than the negative electrode active material layer. The negative electrode active material layer includes a first surface and a second surface. The first surface is formed in a region extending from an edge at one end to a boundary 300 ?m away from the edge in a width direction. The second surface is positioned closer than the first surface to the other end. Regarding the negative electrode protecting layer, the average value of the first thickness of a first portion covering the first surface is 1.7 or more times larger than the maximum value of the second thickness of a second portion covering the second surface.
    Type: Application
    Filed: January 16, 2020
    Publication date: August 27, 2020
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Koichi Katayama, Tetsuya Matsuda, Haruya Nakai
  • Publication number: 20200259182
    Abstract: A positive electrode includes a positive electrode substrate and a positive electrode active material layer disposed on at least one surface of the positive electrode substrate. The positive electrode active material layer contains a positive electrode active material, a binder, and an electroconductive agent. The positive electrode active material layer contains, as the electroconductive agent, a string-shaped agglomerate formed of fibrous carbons gathered and entangled with each other. The agglomerate has a length of 30 ?m or more.
    Type: Application
    Filed: December 23, 2019
    Publication date: August 13, 2020
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Keisuke Ota, Hiroshi Matsuyama, Haruya Nakai
  • Publication number: 20200251721
    Abstract: A negative electrode active material slurry is applied to one surface of a strip-shaped negative electrode core so as to form multiple lines of the negative electrode active material slurry, the lines extending in an X direction and being spaced from each other in a Y direction. Subsequently, while keeping the negative electrode core aloft, first hot air is blown toward the negative electrode core from at least a lower side in a vertical direction, and then, while keeping the negative electrode core aloft, first cooling air having a lower temperature than the first hot air is blown toward the negative electrode core from at least the lower side in the vertical direction so as to decrease the temperature of the negative electrode core to 40° C. or lower.
    Type: Application
    Filed: December 16, 2019
    Publication date: August 6, 2020
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Hidemasa Kawai, Koichi Katayama, Haruya Nakai
  • Publication number: 20200176780
    Abstract: A secondary battery includes a battery case and an electrode assembly housed therein. The electrode assembly includes a positive electrode plate including a positive electrode current collector and a positive electrode active material layer placed thereon and a negative electrode plate including a negative electrode current collector composed of copper foil or copper alloy foil and a negative electrode active material layer placed thereon. The negative electrode current collector is connected to a negative electrode external terminal attached to the battery case with a negative electrode current-collecting lead therebetween. The negative electrode current collector and the negative electrode current-collecting lead are joined together with a resistance weld.
    Type: Application
    Filed: October 29, 2019
    Publication date: June 4, 2020
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Kazuma Mima, Haruya Nakai
  • 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
  • Publication number: 20200075958
    Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes a negative electrode including a negative electrode core and negative electrode mixture layers formed on both surfaces of the negative electrode core. Each of the negative electrode mixture layers contains a cellulose-based binder composed of at least one of carboxymethyl cellulose and a salt thereof. When each of the negative electrode mixture layers is divided in half, at the center in the thickness direction, into a first region near the negative electrode core and a second region far from the negative electrode core, the content of the cellulose-based binder present in the first region is 35% by mass or more and less than 50% by mass of the total mass of the cellulose-based binder contained in the entire of each of the negative electrode mixture layers.
    Type: Application
    Filed: August 26, 2019
    Publication date: March 5, 2020
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Naoki Uchida, Haruya Nakai, Ayumi Kochi
  • 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: 20190288287
    Abstract: A nonaqueous electrolyte secondary battery includes a first electrode plate including a core plate and an active material layer including an active material and a binder, and disposed on a surface of the core plate; a second electrode plate; and a nonaqueous electrolyte. When the surface of the active material layer in contact with the core plate is taken as zero point, the amount of the binder in a 0%-10% thickness region X is 8.5 to 9.5 mass % of the total amount of the binder in the active material layer, the amount of the binder in a 90%-100% thickness region Y is 9.5 to 11.5 mass % of the total amount of the binder in the active material layer, and a binder-richest portion across the thickness of the active material layer resides in a 55%-100% thickness region across the thickness of the active material layer.
    Type: Application
    Filed: January 23, 2019
    Publication date: September 19, 2019
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Naoki Uchida, Ayumi Kochi, Haruya Nakai
  • Publication number: 20190273251
    Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode plate having a positive electrode active material layer formed on a positive electrode core, a negative electrode plate having a negative electrode active material layer formed on a negative electrode core, and a flat-shape wound electrode body in which the positive electrode plate and the negative electrode plate are wound through a separator. Further, a protective layer is formed on the positive electrode active material layer or the negative electrode active material layer. The protective layer contains ceramic particles and a binder, and the average particle diameter (D50) and the average particle diameter (D90) of the ceramic particles are 1.0 ?m to 1.8 ?m and 3.0 ?m to 5.0 ?, respectively.
    Type: Application
    Filed: January 23, 2019
    Publication date: September 5, 2019
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Tetsuya Matsuda, Haruya Nakai
  • 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: 9257717
    Abstract: In a wound electrode group, a positive electrode includes positive electrode active material layers formed on both surfaces of a band-like positive electrode current collector, and a negative electrode includes negative electrode active material layers on both surfaces of a band-like negative electrode current collector. Charge capacity of the negative electrode falls within a range of 83-99% of theoretical capacity of the negative electrode in a full charge state of a nonaqueous electrolyte secondary battery. An active material mass M1 per unit area of a negative electrode active material layer formed on an outer circumference of the negative electrode current collector, and an active material mass M2 per unit area of a negative electrode active material layer formed on an inner circumference satisfy a relational expression of M1/M2<(R1+t/2)/(R1?t/2), where the electrode group has an innermost diameter of R1, and the negative electrode has a thickness of t.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: February 9, 2016
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yoshiyuki Muraoka, Masaya Ugaji, Takahiro Aoyama, Haruya Nakai
  • Publication number: 20140141305
    Abstract: In a wound electrode group, a positive electrode 10 includes positive electrode active material layers formed on both surfaces of a band-like positive electrode current collector, and a negative electrode includes negative electrode active material layers on both surfaces of a band-like negative electrode current collector. Charge capacity of the negative electrode falls within a range of 83-99% of theoretical capacity of the negative electrode in a full charge state of a nonaqueous electrolyte secondary battery. An active material mass M1 per unit area of a negative electrode active material layer formed on an outer circumference of the negative electrode current collector, and an active material mass M2 per unit area of a negative electrode active material layer formed on an inner circumference satisfy a relational expression of M1/M2<(R1+t/2)/(R1?t/2), where the electrode group has an innermost diameter of R1, and the negative electrode has a thickness of t.
    Type: Application
    Filed: April 3, 2012
    Publication date: May 22, 2014
    Applicant: PANASONIC CORPORATION
    Inventors: Yoshiyuki Muraoka, Masaya Ugaji, Takahiro Aoyama, Haruya Nakai
  • Patent number: 8610408
    Abstract: A lithium ion secondary battery which includes: a power generation element including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte; a case accommodating the power generation element and having an opening; and a sealing plate sealing the opening of the case is charged. The sealing plate has an external terminal of the positive or negative electrode, and an internal terminal electrically connected to the positive or negative electrode. The external and internal terminals are connected to each other and have an electrical resistance therebetween of 0.1 to 2 m?. Two or more constant-current charging steps in each of which the secondary battery is charged at a constant charge current until a charge voltage reaches an end-of-charge voltage are performed.
    Type: Grant
    Filed: November 26, 2010
    Date of Patent: December 17, 2013
    Assignee: Panasonic Corporation
    Inventors: Haruya Nakai, Ryouichi Tanaka, Akira Nagasaki
  • Patent number: 8102155
    Abstract: A discharge controller includes a secondary battery, a switch section for opening/closing a discharge path from the secondary battery to a load, a voltage detector for detecting a terminal voltage of the secondary battery, and a cut-off voltage control section for controlling the switch section to be opened when the terminal voltage as detected by the voltage detector is not more than a predetermined cut-off voltage of discharge VE, while measuring an amount of decrease per unit time of the terminal voltage as detected by the voltage detector to set the cut-off voltage of discharge VE to a lower voltage, for a larger amount of decrease per unit time of the terminal voltage as detected by the voltage detector.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: January 24, 2012
    Assignee: Panasonic Corporation
    Inventors: Yoshiyuki Muraoka, Haruya Nakai
  • Publication number: 20110316487
    Abstract: A lithium ion secondary battery which includes: a power generation element including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte; a case accommodating the power generation element and having an opening; and a sealing plate sealing the opening of the case is charged. The sealing plate has an external terminal of the positive or negative electrode, and an internal terminal electrically connected to the positive or negative electrode. The external and internal terminals are connected to each other and have an electrical resistance therebetween of 0.1 to 2 m?. Two or more constant-current charging steps in each of which the secondary battery is charged at a constant charge current until a charge voltage reaches an end-of-charge voltage are performed.
    Type: Application
    Filed: November 26, 2010
    Publication date: December 29, 2011
    Inventors: Haruya Nakai, Ryouichi Tanaka, Akira Nagasaki