Patents by Inventor Akira SAGUCHI

Akira SAGUCHI 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: 20220384786
    Abstract: A nickel metal hydride secondary battery comprises an outer can and an electrode assembly housed in the outer can together with an alkaline electrolytic solution, wherein the electrode assembly is such that a positive electrode including a positive electrode mixture and a negative electrode including a negative electrode mixture are superimposed with a separator interposed therebetween, the positive electrode mixture includes nickel hydroxide forming a solid solution with zinc as a positive electrode active material and zinc oxide as a positive electrode additive, the negative electrode mixture includes hydrogen absorbing alloy particles and a negative electrode additive, the negative electrode additive is a composite in which yttrium fluoride is supported on carbon black, and a surface of the hydrogen absorbing alloy particles is partially coated with the composite.
    Type: Application
    Filed: April 22, 2022
    Publication date: December 1, 2022
    Inventors: Akira Saguchi, Shota Ohata, Jun Ishida, Yuki Ehara, Masaru Kihara
  • Publication number: 20220384779
    Abstract: A hydrogen absorbing alloy negative electrode is provided. The hydrogen absorbing alloy negative electrode has a hydrogen absorbing alloy, and an additive including yttrium fluoride. A mass of the yttrium fluoride is 0.1 parts by mass or more and 0.2 parts by mass or less based on a hydrogen absorbing alloy powder of 100 parts by mass.
    Type: Application
    Filed: May 14, 2022
    Publication date: December 1, 2022
    Inventors: Shota Ohata, Akira Saguchi, Jun Ishida, Yuki Ehara, Masaru Kihara
  • Publication number: 20220384808
    Abstract: A negative electrode for an alkaline storage battery that achieves both an improvement in cycle life and an improvement in low temperature discharge characteristics, and an alkaline storage battery including the negative electrode are disclosed. The negative electrode for an alkaline storage battery includes a negative electrode core body formed of metal, and a negative electrode mixture layer which contains at least a hydrogen storage alloy and yttrium fluoride, and is carried on the negative electrode core body. Particles of the yttrium fluoride are formed so that the average particle size thereof is equal to 1 ?m or more and 7 ?m or less.
    Type: Application
    Filed: May 13, 2022
    Publication date: December 1, 2022
    Inventors: Yuki Ehara, Jun Ishida, Shota Ohata, Akira Saguchi, Masaru Kihara
  • Publication number: 20220294025
    Abstract: An electrode has a band-shaped core and an electrode mixture layer carried by the core to form a spiral electrode assembly with a gas generating electrode and a separator for an alkaline secondary battery. The electrode in the spiral shape has a first circumference portion, an intermediate portion, and an outermost circumference portion. The first circumference portion is a starting portion for winding into the spiral shape. The intermediate portion is a second and following circumferences of the spiral shape. The outermost circumference portion has an inner surface only which faces the gas generating electrode. The electrode mixture layer includes a reactant that develops a reaction consuming gas generated from the gas generating electrode. An amount of the reactant in the first circumference portion is more than those in the intermediate portion and/or the outermost circumference portion.
    Type: Application
    Filed: March 2, 2022
    Publication date: September 15, 2022
    Inventor: Akira Saguchi
  • Patent number: 11355753
    Abstract: A negative electrode used in a nickel metal hydride secondary battery includes a negative electrode core body and a negative electrode mixture carried on the negative electrode core body. The negative electrode mixture includes hydrogen storage alloy powder which is an aggregate of hydrogen storage alloy particles, a binder, and a thickener. The hydrogen storage alloy particles have a volume mean particle size of 40 ?m or less and a concentration of chlorine of not less than 180 ppm to not more than 780 ppm.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: June 7, 2022
    Assignee: FDK CORPORATION
    Inventors: Jun Ishida, Akira Saguchi, Shota Ohata
  • Publication number: 20210257674
    Abstract: An alkaline storage battery includes a spiral electrode group in which a positive electrode plate, a negative electrode plate, and a separator arranged between the positive electrode plate and the negative electrode plate are laminated, the negative electrode plate is located on the inner peripheral side of the positive electrode plate at an innermost peripheral portion, and an electrically conductive outer packaging can in which the spiral electrode group is accommodated together with an alkaline electrolytic solution. The negative electrode plate includes a negative electrode core body, a first negative electrode mixture layer carried on a surface on the outer peripheral side of the negative electrode core body, and a second negative electrode mixture layer carried on a surface on the inner peripheral side of the negative electrode core body.
    Type: Application
    Filed: January 26, 2021
    Publication date: August 19, 2021
    Inventor: Akira Saguchi
  • Patent number: 11043664
    Abstract: A battery comprises an electrode group including a separator, a positive electrode and a negative electrode. The negative electrode comprises a negative electrode core, negative electrode mixture layers retained to the negative electrode core, and a fluorine resin layer disposed on the surface of the negative electrode mixture layers. The negative electrode mixture layers include a first outermost peripheral region located at the outermost periphery of the electrode group and a second outermost peripheral region located opposite to the first outermost peripheral region. When the amount of the fluorine resin constituting a first fluorine resin layer in a portion of the first outermost peripheral region is represented by A, and the amount of the fluorine resin constituting a second fluorine resin layer in a portion of the second outermost peripheral region is represented by B, a relation A>B is satisfied.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: June 22, 2021
    Assignee: FDK CORPORATION
    Inventors: Toshiki Sato, Jun Ishida, Akira Saguchi, Shota Ohata
  • Patent number: 11038161
    Abstract: A nickel-hydrogen secondary battery includes an electrode group which contains a positive electrode, a negative electrode, and a separator, wherein the negative electrode includes a negative electrode core, and a negative electrode mixture layer held by the negative electrode core, wherein the negative electrode mixture layer contains a fluororesin; a quantity of the fluororesin, expressed by a mass applied per unit area of the negative electrode, is within a range of 0.2 mg/cm2 or more and 2.0 mg/cm2 or less; and a fluororesin content which is a ratio of the fluororesin contained in a unit volume of the negative electrode mixture layer is higher in an inner layer portion than in an outer layer portion in the negative electrode mixture layer.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: June 15, 2021
    Assignee: FDK CORPORATION
    Inventors: Shota Ohata, Jun Ishida, Toshiki Sato, Akira Saguchi
  • Publication number: 20200313179
    Abstract: A negative electrode used in a nickel metal hydride secondary battery includes a negative electrode core body and a negative electrode mixture carried on the negative electrode core body. The negative electrode mixture includes hydrogen storage alloy powder which is an aggregate of hydrogen storage alloy particles, a binder, and a thickener. The hydrogen storage alloy particles have a volume mean particle size of 40 ?m or less and a concentration of chlorine of not less than 180 ppm to not more than 780 ppm.
    Type: Application
    Filed: March 27, 2020
    Publication date: October 1, 2020
    Inventors: Jun Ishida, Akira Saguchi, Shota Ohata
  • Publication number: 20200303726
    Abstract: A nickel hydrogen secondary battery 2 has an electrode group 22 composed of a separator 28, a positive electrode 24 and a negative electrode 26, wherein the negative electrode 26 has a negative electrode core body and a negative electrode mixture held on the negative electrode core body; the negative electrode mixture comprises a hydrogen absorbing alloy powder composed of particles of a hydrogen absorbing alloy, a powder of an electroconductive agent, and a powder of a negative electrode additive; and the electroconductive agent is a hollow carbon black whose primary particle has a hollow-shell structure, and the negative electrode additive is a fluorine-containing anionic surfactant.
    Type: Application
    Filed: February 9, 2017
    Publication date: September 24, 2020
    Inventors: Akira Saguchi, Jun Ishida, Shota Ohata
  • Patent number: 10693194
    Abstract: A nickel hydrogen secondary battery accommodates an electrode group including a positive electrode and a negative electrode which are stacked one on top of another through a separator, together with an alkaline electrolyte. The battery contains Li, with a total amount of Li in the battery 2 of 15 to 50 mg/Ah, as determined as the mass in terms of LiOH per Ah of the positive electrode capacity. The negative electrode includes particles of rare earth-Mg—Ni-based hydrogen storage alloy which contains a rare earth element, Mg and Ni. The hydrogen storage alloy particles 44 includes, on the surface thereof, a rare earth hydroxide which is the hydroxide of a rare earth element and has a specific surface area of 0.1 to 0.5 m2/g.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: June 23, 2020
    Assignee: FDK CORPORATION
    Inventors: Masaru Kihara, Akira Saguchi, Yusuke Shingai, Jun Ishida, Takuya Kai
  • Publication number: 20190319260
    Abstract: A battery comprises an electrode group including a separator, a positive electrode and a negative electrode. The negative electrode comprises a negative electrode core, negative electrode mixture layers retained to the negative electrode core, and a fluorine resin layer disposed on the surface of the negative electrode mixture layers. The negative electrode mixture layers include a first outermost peripheral region located at the outermost periphery of the electrode group and a second outermost peripheral region located opposite to the first outermost peripheral region. When the amount of the fluorine resin constituting a first fluorine resin layer in a portion of the first outermost peripheral region is represented by A, and the amount of the fluorine resin constituting a second fluorine resin layer in a portion of the second outermost peripheral region is represented by B, a relation A>B is satisfied.
    Type: Application
    Filed: April 12, 2019
    Publication date: October 17, 2019
    Inventors: Toshiki Sato, Jun Ishida, Akira Saguchi, Shota Ohata
  • Publication number: 20190305301
    Abstract: A nickel-hydrogen secondary battery includes an electrode group which contains a positive electrode, a negative electrode, and a separator, wherein the negative electrode includes a negative electrode core, and a negative electrode mixture layer held by the negative electrode core, wherein the negative electrode mixture layer contains a fluororesin; a quantity of the fluororesin, expressed by a mass applied per unit area of the negative electrode, is within a range of 0.2 mg/cm2 or more and 2.0 mg/cm2 or less; and a fluororesin content which is a ratio of the fluororesin contained in a unit volume of the negative electrode mixture layer is higher in an inner layer portion than in an outer layer portion in the negative electrode mixture layer.
    Type: Application
    Filed: March 18, 2019
    Publication date: October 3, 2019
    Inventors: Shota Ohata, Jun Ishida, Toshiki Sato, Akira Saguchi
  • Publication number: 20190148723
    Abstract: A nickel hydrogen secondary battery 2 has an electrode group 22 including a separator 28, a positive electrode 24, and a negative electrode 26. The negative electrode 26 has a negative electrode core, and a negative electrode mixture held on the negative electrode core. The negative electrode mixture contains a hydrogen absorbing alloy and a water repellent. The hydrogen absorbing alloy has a composition represented by the general formula: Ln1-xMgxNiy-a-bAlaMb, where Ln represents at least one element selected from rare earth elements, Ti and Zr; M represents at least one element selected from V, Nb, Ta, and the like, and the subscripts a, b, x and y satisfy relations represented by 0.05?a?0.30, 0?b?0.50, 0?x<0.05 and 2.8?y?3.9, respectively. The hydrogen absorbing alloy has a structure of an A2B7 type. The water repellent comprises a perfluoroalkoxyalkane.
    Type: Application
    Filed: November 5, 2018
    Publication date: May 16, 2019
    Inventors: Akira Saguchi, Jun Ishida, Shota Ohata
  • Publication number: 20180248172
    Abstract: A nickel hydrogen secondary battery comprises an outer can and an electrode group accommodated in a hermetically sealed state together with an alkaline electrolyte solution in the outer can, wherein the electrode group comprises a positive electrode and a negative electrode stacked through a separator, wherein the negative electrode contains a hydrogen absorbing alloy powder that is an aggregate of particles of a hydrogen absorbing alloy, wherein the hydrogen absorbing alloy powder is such that when an average particle size of the particles is represented by M; a particle size of ½ of the M is represented by P; and a particle size of ? of the M is represented by Q, a content of the particles having a particle size equal to or smaller than the P is lower than 20% by mass of the whole of the hydrogen absorbing alloy powder; and the content of the particles having a particle size equal to or smaller than the Q is lower than 10% by mass of the whole of the hydrogen absorbing alloy powder.
    Type: Application
    Filed: February 24, 2016
    Publication date: August 30, 2018
    Inventors: Masaru Kihara, Akira Saguchi, Yusuke Shingai, Jun Ishida, Takuya Kai, Takeshi Kajiwara
  • Publication number: 20180114981
    Abstract: A nickel-hydrogen secondary battery includes an electrode group that includes a separator, a positive electrode and a negative electrode, and the negative electrode contains a hydrogen storage alloy having a crystal structure in which an AB2 type unit and an AB5 type unit are laminated, in which a PCT characteristic diagram at 80° C. includes a first plateau region having a hydrogen pressure Pd1 when hydrogen is stored by 0.25 times an effective hydrogen storage amount that is a hydrogen storage amount when a hydrogen pressure is 1 MPa, and a second plateau region having a hydrogen pressure Pd2 when hydrogen is stored by 0.70 times the effective hydrogen storage amount, and Pd1 and Pd2 satisfy a relation of 0.6?log10(Pd2/Pd1).
    Type: Application
    Filed: March 10, 2016
    Publication date: April 26, 2018
    Inventors: Jun Ishida, Masaru Kihara, Akira Saguchi, Yusuke Shingai, Takuya Kai, Takeshi Kajiwara
  • Publication number: 20170110764
    Abstract: A nickel hydrogen secondary battery accommodates an electrode group including a positive electrode and a negative electrode which are stacked one on top of another through a separator, together with an alkaline electrolyte. The battery contains Li, with a total amount of Li in the battery 2 of 15 to 50 mg/Ah, as determined as the mass in terms of LiOH per Ah of the positive electrode capacity. The negative electrode includes particles of rare earth-Mg—Ni-based hydrogen storage alloy which contains a rare earth element, Mg and Ni. The hydrogen storage alloy particles 44 includes, on the surface thereof, a rare earth hydroxide which is the hydroxide of a rare earth element and has a specific surface area of 0.1 to 0.5 m2/g.
    Type: Application
    Filed: June 23, 2015
    Publication date: April 20, 2017
    Inventors: Masaru Kihara, Akira Saguchi, Yusuke Shingai, Jun Ishida, Takuya Kai
  • Patent number: 9343742
    Abstract: A nickel hydride secondary battery houses an electrode group including a positive electrode and a negative electrode which are overlapped with each other via a separator with an alkaline electrolyte solution, the negative electrode includes a hydrogen absorbing alloy, a negative-electrode additive agent, a thickening agent, and a conductive material, and the negative-electrode additive agent includes at least one selected from calcium fluoride, calcium sulfide, and calcium chloride.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: May 17, 2016
    Assignee: FDK CORPORATION
    Inventors: Masaru Kihara, Akira Saguchi, Masaaki Takei, Takeshi Ito, Yuzo Imoto
  • Patent number: 8785019
    Abstract: A negative electrode for a nickel-hydrogen rechargeable battery is a strip-shaped negative electrode, the negative electrode being formed of a core body and a negative mixture layer covering the core body and containing hydrogen-storage alloy particles, including a main section, both sides of which face the positive electrode with the separator intervening therebetween as viewed in a rolled state where the negative electrode forms the electrode group with the positive electrode and the separator, and an outermost circumferential portion and an innermost circumferential portion that are protruding from ends of the main section in a rolling direction and facing the positive electrode with the separator intervening therebetween only with one side, wherein the hydrogen-storage alloy particles contained in the outermost circumferential portion and the innermost circumferential portion have an average diameter larger than an average diameter of the hydrogen-storage alloy particles contained in the main section.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: July 22, 2014
    Assignee: FDK Twicell Co., Ltd.
    Inventors: Masaru Kihara, Takahiro Endo, Toshiki Sato, Akira Saguchi, Satoshi Wada, Isao Mugima, Tomomi Nakamura, Hideyuki Asanuma, Masanori Tamura
  • Publication number: 20140120411
    Abstract: A nickel hydride secondary battery houses an electrode group including a positive electrode and a negative electrode which are overlapped with each other via a separator with an alkaline electrolyte solution, the negative electrode includes a hydrogen absorbing alloy, a negative-electrode additive agent, a thickening agent, and a conductive material, and the negative-electrode additive agent includes at least one selected from calcium fluoride, calcium sulfide, and calcium chloride.
    Type: Application
    Filed: October 29, 2013
    Publication date: May 1, 2014
    Applicant: FDK TWICELL CO., LTD.
    Inventors: Masaru Kihara, Akira Saguchi, Masaaki Takei, Takeshi Ito, Yuzo Imoto