Patents by Inventor Yoshiaki Nitta

Yoshiaki Nitta 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: 11043717
    Abstract: A non-aqueous electrolyte secondary battery with improved cycle durability includes a power generating element including a positive electrode obtained by forming a positive electrode active material layer containing a positive electrode active material on a surface of a positive electrode current collector, a negative electrode obtained by forming a negative electrode active material layer containing a negative electrode active material on a surface of a negative electrode current collector, and a separator, a ratio of a rated capacity to a pore volume of the separator being 1.55 Ah/cc or more, a ratio of a battery area to a rated capacity being 4.0 cm2/Ah or more, and a rated capacity being 30 Ah or more, wherein a variation in porosity in the separator is 4.0% or less.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: June 22, 2021
    Assignee: Envision AESC Japan Ltd.
    Inventors: Manabu Nishijima, Fumihiro Kawamura, Yuji Muroya, Yoshiaki Nitta
  • Publication number: 20190355969
    Abstract: Provided is a non-aqueous electrolyte secondary battery which has improved battery durability in the battery having a high capacity, a high density, and a large area. A non-aqueous electrolyte secondary battery including a power generating element including a positive electrode in which a positive electrode active material layer containing a positive electrode active material is formed on a surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer containing a negative electrode active material is formed on a surface of a negative electrode current collector, and a separator, a ratio of a rated capacity to a pore volume of the positive electrode active material layer being 1.40 Ah/cc or more, a ratio of a battery area to a rated capacity being 4.0 cm2/Ah or more, and a rated capacity being 30 Ah or more, wherein a variation in porosity in the positive electrode active material layer is 6.0% or less.
    Type: Application
    Filed: June 8, 2016
    Publication date: November 21, 2019
    Inventors: Yuji Muroya, Fumihiro Kawamura, Manabu Nishijima, Yoshiaki Nitta
  • Patent number: 10476110
    Abstract: A non-aqueous electrolyte secondary battery has improved battery durability, a high capacity, a high density, and a large area and includes a power generating element including a positive electrode in which a positive electrode active material layer containing a positive electrode active material is formed on a surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer containing a negative electrode active material is formed on a surface of a negative electrode current collector, and a separator, a ratio of a rated capacity to a pore volume of the negative electrode active material layer being 1.12 Ah/cc or more, a ratio of a battery area to a rated capacity being 4.0 cm2/Ah or more, and a rated capacity being 30 Ah or more, wherein a variation in porosity in the negative electrode active material layer is 6.0% or less.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: November 12, 2019
    Assignee: Envision AESC Japan Ltd.
    Inventors: Fumihiro Kawamura, Manabu Nishijima, Yuji Muroya, Yoshiaki Nitta
  • Patent number: 10431852
    Abstract: A flat secondary battery has a laminate-type power generation element in which two or more plate-like electrodes are laminated via separators; and a pair of rectangular exterior members defined by long sides and short sides when viewed from a lamination direction of the two or more electrodes that seal the power generation element and an electrolyte solution. At least one exterior member of the pair of the rectangular exterior members comprises: an abutting part including an abutting surface that abuts against an uppermost layer electrode of the two or more electrodes; a sealing part at which the rectangular exterior members overlap each other at an outer circumferential position of the rectangular exterior members; and an extending part that extends from the abutting part to the sealing part, and the flat secondary battery satisfies 1?LA/LB?2.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: October 1, 2019
    Assignee: Envision AESC Japan Ltd.
    Inventors: Takehiro Maeda, Takamitsu Saito, Azusa Matsuo, Ami Oume, Yoshiaki Nitta
  • Publication number: 20190273285
    Abstract: Provided is a non-aqueous electrolyte secondary battery which has improved battery durability in the battery having a high capacity, a high density, and a large area. A non-aqueous electrolyte secondary battery including a power generating element including a positive electrode in which a positive electrode active material layer containing a positive electrode active material is formed on a surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer containing a negative electrode active material is formed on a surface of a negative electrode current collector, and a separator, a ratio of a rated capacity to a pore volume of the negative electrode active material layer being 1.12 Ah/cc or more, a ratio of a battery area to a rated capacity being 4.0 cm2/Ah or more, and a rated capacity being 30 Ah or more, wherein a variation in porosity in the negative electrode active material layer is 6.0% or less.
    Type: Application
    Filed: June 8, 2016
    Publication date: September 5, 2019
    Inventors: Fumihiro Kawamura, Manabu Nishijima, Yuji Muroya, Yoshiaki Nitta
  • Publication number: 20190259999
    Abstract: Provided is a means capable of improving battery cycle durability in a non-aqueous electrolyte secondary battery having a capacity and a size which are assumed to increase the capacity. A non-aqueous electrolyte secondary battery including a power generating element including a positive electrode obtained by forming a positive electrode active material layer containing a positive electrode active material on a surface of a positive electrode current collector, a negative electrode obtained by forming a negative electrode active material layer containing a negative electrode active material on a surface of a negative electrode current collector, and a separator, a ratio of a rated capacity to a pore volume of the separator being 1.55 Ah/cc or more, a ratio of a battery area to a rated capacity being 4.0 cm2/Ah or more, and a rated capacity being 30 Ah or more, wherein a variation in porosity in the separator is 4.0% or less.
    Type: Application
    Filed: June 8, 2016
    Publication date: August 22, 2019
    Applicant: Nissan Motor Co., Ltd.
    Inventors: Manabu NISHIJIMA, Fumihiro KAWAMURA, Yuji MUROYA, Yoshiaki NITTA
  • Publication number: 20190252675
    Abstract: A non-aqueous electrolyte secondary battery is obtained by encasing, inside an outer casing formed of a laminate film, a power generating element containing a positive electrode obtained by forming, on the surface of a positive electrode current collector, a positive electrode active substance layer containing a positive electrode active substance, a negative electrode obtained by forming, on the surface of a negative electrode current collector, a negative electrode active substance layer containing a negative electrode active substance, and a separator, wherein the positive electrode active substance is made to contain a spinel type lithium manganese composite oxide and a lithium nickel-based composite oxide and the mixing ratio of the lithium nickel-based composite oxide is 30 to 70% by weight relative to the total 100% by weight of the spinel type lithium manganese composite oxide and the lithium nickel-based composite oxide.
    Type: Application
    Filed: April 23, 2019
    Publication date: August 15, 2019
    Inventors: Kenji Ohara, Yoshiaki Nitta, Manabu Nishijima, Hidenori Murata
  • Patent number: 10381608
    Abstract: A flat type battery includes an exterior member housing an electrolytic solution and a power generating element. The power generating element contains electrodes alternating layered between electrolyte layers, and expands with use in a layering direction of the electrodes. The exterior member forms a tightly sealed space in which the power generating element is housed, and in which an extra space is formed between the exterior member and a side surface extending along the layering direction of the power generating element. The exterior member includes a volume adjustment portion allowing for an increase in the volume of the extra space by expanding in response to a pressure rise inside the tightly sealed space while the exterior member is being pressed against the surfaces intersecting the layering direction of the power generating element due to a pressure difference between the exterior and the interior.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: August 13, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Ami Oume, Azusa Matsuo, Takamitsu Saito, Takehiro Maeda, Yoshiaki Nitta
  • Patent number: 10270127
    Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode having a negative electrode active material, and a separator containing an electrolyte. The electrolyte includes an electrolyte salt, a nonaqueous solvent into which the electrolyte salt can be dissolved, a first additive selected from predetermined oxalate compounds and disulfonic acid ester compounds, and a second additive that has a reduction potential less than the reduction potential of the first additive. The second additive is selected from a group having vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone, succinonitrile, and adiponitrile.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: April 23, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kenji Ohara, Norihisa Waki, Yoshiaki Nitta, Masanori Aoyagi
  • Patent number: 10193159
    Abstract: A current collector for a secondary battery (1) of the present invention includes a resin layer (2) having electrical conductivity, and an ion barrier layer (3) provided on the surface of the resin layer (2). The ion barrier layer (3) contains ion trapping particles (6) in which metal compounds (5) are provided on the surfaces of metal containing particles (4). The ion trapping particles (6) are continuously provided from an interface (7) between the resin layer (2) and the ion barrier layer (3) toward a surface (3a) of the ion barrier layer (3). Thus, the ion barrier layer (3) prevents from the entry of ions, so that the ion adsorption in the current collector (1) can be decreased.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: January 29, 2019
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Chizuru Matsuyama, Yasuyuki Tanaka, Takashi Honda, Shigeo Ibuka, Yoshiaki Nitta, Satoru Ichikawa, Manabu Kaseda, Tomoya Kubota, Haruyuki Saito, Keisuke Shimamoto, Kana Sato, Yukinari Kato, Hideaki Horie
  • Patent number: 10186693
    Abstract: A flat secondary battery has a laminate-type power generation element in which two or more plate-like electrodes are laminated via each of separators; and a pair of rectangular exterior members when viewed from a lamination direction of the two or more electrodes, the rectangular exterior members sealing the laminate-type power generation element and an electrolyte solution. At least one exterior member of the pair of the rectangular exterior members comprises: an abutting part including an abutting surface that abuts against an uppermost layer electrode of the two or more electrodes; a sealing part at which the rectangular exterior members overlap each other at an outer circumferential position of the rectangular exterior members; and an extending part that extends from the abutting part to the sealing part, and the flat secondary battery satisfies: 1.03 ? L b 2 + d 2 ? 1.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: January 22, 2019
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Azusa Matsuo, Yoshiaki Nitta, Takamitsu Saito, Ami Oume, Takehiro Maeda
  • Patent number: 10033033
    Abstract: A non-aqueous electrolyte secondary battery has the internal resistance of 10 m?/Ah or less (SOC of 50%) and has a power generating element containing the following: a positive electrode obtained by forming, on the surface of a positive electrode current collector, a positive electrode active substance layer containing a positive electrode active substance; a negative electrode obtained by forming, on the surface of a negative electrode current collector, a negative electrode active substance layer containing a negative electrode active substance; and a separator. The positive electrode active substance is made to contain a spinel type lithium manganese composite oxide and a lithium nickel-based composite oxide, and the mixing ratio of the lithium nickel-based composite oxide is 50 to 70% by weight relative to the total 100% by weight of the spinel type lithium manganese composite oxide and the lithium nickel-based composite oxide.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: July 24, 2018
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kenji Ohara, Yoshiaki Nitta, Gentaro Kano, Tomoya Kubota, Masanori Aoyagi
  • Publication number: 20180191027
    Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode having a negative electrode active material, and a separator containing an electrolyte. The electrolyte includes an electrolyte salt, a nonaqueous solvent into which the electrolyte salt can be dissolved, a first additive selected from predetermined oxalate compounds and disulfonic acid ester compounds, and a second additive that has a reduction potential less than the reduction potential of the first additive. The second additive is selected from a group having vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone, succinonitrile, and adiponitrile.
    Type: Application
    Filed: July 9, 2015
    Publication date: July 5, 2018
    Inventors: Kenji OHARA, Norihisa WAKI, Yoshiaki NITTA, Masanori AOYAGI
  • Publication number: 20180166663
    Abstract: A flat type battery includes an exterior member housing an electrolytic solution and a power generating element. The power generating element contains electrodes alternating layered between electrolyte layers, and expands with use in a layering direction of the electrodes. The exterior member forms a tightly sealed space in which the power generating element is housed, and in which an extra space is formed between the exterior member and a side surface extending along the layering direction of the power generating element. The exterior member includes a volume adjustment portion allowing for an increase in the volume of the extra space by expanding in response to a pressure rise inside the tightly sealed space while the exterior member is being pressed against the surfaces intersecting the layering direction of the power generating element due to a pressure difference between the exterior and the interior.
    Type: Application
    Filed: July 1, 2015
    Publication date: June 14, 2018
    Inventors: Ami OUME, Azusa MATSUO, Takamitsu SAITO, Takehiro MAEDA, Yoshiaki NITTA
  • Patent number: 9716266
    Abstract: [Object] Provided is a means for improving cycle characteristics by suppressing electrode deterioration resulting from non-uniformity of voltage across an electrode plane in a high-capacity and large-area non-aqueous electrolyte secondary battery that includes lithium nickel-based composite oxide as a positive electrode active substance.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: July 25, 2017
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Kenji Ohara, Yoshiaki Nitta, Satoru Ichikawa, Gentaro Kano, Manabu Nishijima, Osamu Shimamura, Fumihiro Kawamura, Kousuke Hagiyama, Shigeo Ibuka, Manabu Kaseda, Masanori Suenaga, Tamaki Hirai, Masahiro Takaya, Kuniharu Nomoto
  • Patent number: 9608261
    Abstract: [Object] Provided is a means for improving cycle characteristics by suppressing electrode deterioration resulting from non-uniformity of voltage across an electrode plane in a high-capacity and large-area non-aqueous electrolyte secondary battery that includes lithium nickel-based composite oxide as a positive electrode active substance.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: March 28, 2017
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Kenji Ohara, Yoshiaki Nitta, Satoru Ichikawa, Gentaro Kano, Manabu Nishijima, Osamu Shimamura, Fumihiro Kawamura, Kousuke Hagiyama, Shigeo Ibuka, Manabu Kaseda, Masanori Suenaga, Tamaki Hirai, Masahiro Takaya, Kuniharu Nomoto
  • Publication number: 20170025710
    Abstract: A flat secondary battery has a laminate-type power generation element in which two or more plate-like electrodes are laminated via separators; and a pair of rectangular exterior members defined by long sides and short sides when viewed from a lamination direction of the two or more electrodes that seal the power generation element and an electrolyte solution. At least one exterior member of the pair of the rectangular exterior members comprises: an abutting part including an abutting surface that abuts against an uppermost layer electrode of the two or more electrodes; a sealing part at which the rectangular exterior members overlap each other at an outer circumferential position of the rectangular exterior members; and an extending part that extends from the abutting part to the sealing part, and the flat secondary battery satisfies 1?LA/LB?2.
    Type: Application
    Filed: March 31, 2015
    Publication date: January 26, 2017
    Inventors: Takehiro Maeda, Takamitsu Saito, Azusa Matsuo, Ami Oume, Yoshiaki Nitta
  • Publication number: 20170025649
    Abstract: A flat secondary battery has a laminate-type power generation element in which two or more plate-like electrodes are laminated via each of separators; and a pair of rectangular exterior members when viewed from a lamination direction of the two or more electrodes, the rectangular exterior members sealing the laminate-type power generation element and an electrolyte solution. At least one exterior member of the pair of the rectangular exterior members comprises: an abutting part including an abutting surface that abuts against an uppermost layer electrode of the two or more electrodes; a sealing part at which the rectangular exterior members overlap each other at an outer circumferential position of the rectangular exterior members; and an extending part that extends from the abutting part to the sealing part, and the flat secondary battery satisfies: 1.03 ? L b 2 + d 2 ? 1.
    Type: Application
    Filed: March 31, 2015
    Publication date: January 26, 2017
    Inventors: Azusa Matsuo, Yoshiaki Nitta, Takamitsu Saito, Ami Oume, Takehiro Maeda
  • Patent number: 9496742
    Abstract: A control device of a secondary battery has a current detection unit (103) that detects a charge current to the secondary battery (101) and a discharge current from the secondary battery (101); a calculation unit (107) that calculates, from the charge current and the discharge current, a charge-discharge efficiency and a discharge-charge efficiency when performing a charge operation and a discharge operation; a deterioration judgment unit (107) that judges a deterioration state of the secondary battery (101) from a temporal change rate of the charge-discharge efficiency and a temporal change rate of the discharge-charge efficiency; and a control unit (107) that sets a charge termination voltage of the secondary battery (101) in accordance with the deterioration state.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: November 15, 2016
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Sohei Suga, Tamaki Miura, Yosuke Suzuki, Shinsaku Ehara, Yoshiaki Nitta, Masanori Aoyagi, Takayuki Matsuoka
  • Publication number: 20160190549
    Abstract: A non-aqueous electrolyte secondary battery has the internal resistance of 10 ?/Ah or less (SOC of 50%) and has a power generating element containing the following: a positive electrode obtained by forming, on the surface of a positive electrode current collector, a positive electrode active substance layer containing a positive electrode active substance; a negative electrode obtained by forming, on the surface of a negative electrode current collector, a negative electrode active substance layer containing a negative electrode active substance; and a separator. The positive electrode active substance is made to contain a spinel type lithium manganese composite oxide and a lithium nickel-based composite oxide, and the mixing ratio of the lithium nickel-based composite oxide is 50 to 70% by weight relative to the total 100% by weight of the spinel type lithium manganese composite oxide and the lithium nickel-based composite oxide.
    Type: Application
    Filed: April 23, 2014
    Publication date: June 30, 2016
    Inventors: Kenji OHARA, Yoshiaki NITTA, Gentaro KANO, Tomoya KUBOTA, Masanori AOYAGI