Patents by Inventor Takamitsu Saito

Takamitsu Saito 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: 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
  • 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: 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
  • 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
  • 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
  • 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
  • Patent number: 8728666
    Abstract: An object of the present invention is to provide a positive electrode material for non-aqueous electrolyte lithium-ion battery which capable of discharging high output power and inhibiting cracking of secondary particle in the cyclic endurance at a high temperature. The above object can be attained by a positive electrode material for non-aqueous electrolyte lithium-ion battery of the present invention, characterized in that said material comprises secondary particles composed of primary particles of lithium nickel composite oxide containing the primary particles having different aspect ratios, and that at least a part of said primary particles having different aspect ratios are arranged so as to make the longitudinal direction (the long side direction) thereof oriented toward the center of the secondary particle.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: May 20, 2014
    Assignees: Nissan Motor Co., Ltd., Sumitomo Metal Mining Co., Ltd.
    Inventors: Takanori Itou, Hideaki Horie, Takamitsu Saito, Satoshi Matsumoto
  • Patent number: 8492028
    Abstract: A positive electrode material for non-aqueous electrolyte lithium ion battery (31, 41) of the present invention has an oxide (11) containing lithium and nickel, and a lithium compound (13) which is deposited on a surface of the oxide (11) and covers nickel present on the surface of the oxide (11). By this structure, it is possible to suppress decomposition of an electrolysis solution as much as possible and drastically reduce swelling of the batteries (31, 41).
    Type: Grant
    Filed: November 29, 2004
    Date of Patent: July 23, 2013
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Takanori Itou, Takamitsu Saito, Hideaki Horie
  • Patent number: 8465872
    Abstract: The positive electrode active material sintered body for a battery of the present invention is a positive electrode active material sintered body for a battery satisfying the following requirements (I) to (VII): (I) fine particles in a positive electrode active material are sintered to constitute the sintered body; (II) a peak pore diameter which provides a maximum differential pore volume value in a pore diameter range of 0.01 to 10 ?m in a pore distribution is 0.3 to 5 ?m; (III) a total pore volume is 0.1 to 1 cc/g; (IV) an average particle diameter is not less than the peak pore diameter and not more than 20 ?m; (V) any peak, which provides a differential pore volume value of not less than 10% of the maximum differential pore volume value, is not present on a smaller pore diameter side than the peak pore diameter in the pore distribution; (VI) a BET specific surface area is 1 to 6 m2/g; and (VII) a full width at half maximum of a strongest X-ray diffraction peak is 0.13 to 0.2.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: June 18, 2013
    Assignees: Kao Corporation, Nissan Motor Co., Ltd.
    Inventors: Ryuichi Akagi, Kenichi Nishimura, Yasuhisa Fukumoto, Kyoichi Watanabe, Tamaki Miura, Takamitsu Saito
  • Publication number: 20130129914
    Abstract: In a nonaqueous electrolyte cell-oriented electrode (10), an electrode active material layer (12) formed on a collector (1) has a density gradient developed with a gradient of a varied concentration of a solid along a thickness from a surface of the electrode active material layer (12) toward the collector (1), and in a gel electrolyte cell-oriented electrode (30), an electrode active material layer (32) formed on a collector (1) has a density gradient developed with (a) gradient(s) of (a) varied concentration(s) of one or both of an electrolyte salt and a film forming material along a thickness from a surface of the electrode active material layer (32) toward the collector (1).
    Type: Application
    Filed: January 17, 2013
    Publication date: May 23, 2013
    Inventors: Mori NAGAYAMA, Takamitsu SAITO, Osamu SHIMAMURA
  • Patent number: 8445139
    Abstract: The disclosure relates to bipolar cells including electrodes surrounding a collector. Embodiments of the bipolar cells include a collector containing a high-polymer material. The disclosure also relates to bipolar electrode batteries containing bipolar cells including a collector body containing electrically conductive high-polymer or electrically conductive particles distributed in a high-polymer. By adding such high molecular weight polymer material to the collector, the weight of the collector may be reduced and the output power density per weight of the battery may be improved. The disclosure further relates to methods of forming collecting bodies and electrodes for bipolar cells using an inkjet printing method. Bipolar cells according to the present invention may be used to fabricate batteries such as lithium ion batteries, which may be connected to form battery modules used, for example, to provide electrical power for a motor vehicle.
    Type: Grant
    Filed: December 7, 2005
    Date of Patent: May 21, 2013
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kenji Hosaka, Osamu Shimamura, Hideaki Horie, Takamitsu Saito, Takuya Kinoshita, Takaaki Abe, Naoto Kiriu
  • Patent number: 8444875
    Abstract: The burned composite metal oxide of the present invention is a burned composite metal oxide which is porous and particulate and which is obtained by subjecting a slurry comprising at least one metal oxide (a), at least one metal compound (b) and a solvent to spray granulation to obtain granules, and burning the granules, the metal oxide (a) selected from the group consisting of a transition metal oxide and an oxide of a metal belonging to 3B, 4B and 5B of a periodic table, the metal compound (b) selected from the group consisting of an alkali metal compound and an alkali earth metal compound, wherein the metal oxide (a) and the metal compound (b) are sparingly soluble in the solvent; the burning is conducted after a heat-maintaining step of heating the granules obtained by the spray granulation at a temperature in a range of ±200° C.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: May 21, 2013
    Assignee: Kao Corporation
    Inventors: Kazuo Oki, Minoru Sawai, Hiroaki Kitayama, Takamitsu Saito, Tamaki Miura, Kyoichi Watanabe
  • Publication number: 20130115486
    Abstract: A lithium ion secondary battery includes: an outer covering material that is filled with an electrolyte; a collector that is housed in the outer covering material, formed with an electrode layer containing an active material, and electrically connected with the electrode layer; an insulation layer that is provided on the collector; and a low potential member that is provided on the insulation layer, has a lower oxidation reduction potential than the active material of the electrode layer, and possesses a reduction ability relative to the active material.
    Type: Application
    Filed: July 11, 2011
    Publication date: May 9, 2013
    Inventors: Takamitsu Saito, Shinichiro Sakaguchi, Yasukazu Iwasaki, Kazuyuki Sakamoto
  • Patent number: 8426064
    Abstract: The present invention provides a composite material for positive electrodes of lithium batteries, which provides a lithium battery having excellent high rate electrical discharge characteristics, has a sufficiently secured diffusion passage for Li, and has high conductivity, a process for producing the same, as well as a positive electrode and a battery using the composite material for positive electrodes of lithium batteries. The present invention relates to a composite material for positive electrodes of lithium batteries, comprising composite particles containing positive electrode active material particles and fibrous carbons, wherein the composite particles have a form in which the positive electrode active material particles are supported by the fibrous carbons.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: April 23, 2013
    Assignee: Kao Corporation
    Inventors: Kazuo Oki, Minoru Sawai, Hiroaki Kitayama, Takamitsu Saito, Tamaki Miura, Kyoichi Watanabe
  • Patent number: 8426060
    Abstract: A laminate cell comprises a power generating element formed by sequentially stacking positive electrode plates and negative electrode plates while interposing separators therebetween; a positive tab connected to the positive electrode plates through a plurality of positive leads; a negative tab connected to the negative electrode plates through a plurality of negative leads; and a cell package formed of a metal composite film, the cell package hermetically sealing the power generating element and an electrolyte. According to the laminate cell, the heat capacity of a portion of the positive tab, onto which a plurality of the positive leads are joined, and the heat capacity of a portion of the negative tab, onto which a plurality of the negative leads are joined, are made larger than that of other portions of the positive tab and the negative tab.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: April 23, 2013
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yasunari Hisamitsu, Takaaki Abe, Takanori Ito, Osamu Shimamura, Takamitsu Saito, Hideaki Horie, Hiroshi Sugawara
  • Patent number: 8329337
    Abstract: An electrode and method for preparing the same in which droplets of a first electrode ink composition and droplets of a second electrode ink composition are ejected from an ink jet device onto a base material and the first electrode ink composition contains at least one electrode active material and the second electrode ink composition contains at least one binder material. The resulting electrode is suitable for use in a battery.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: December 11, 2012
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Takamitsu Saito, Takuya Kinoshita, Hideaki Horie, Kyouichi Watanabe, Osamu Shimamura
  • Patent number: 8151914
    Abstract: In a vehicle drive system including a motor and a secondary battery, the motor and secondary battery are integrated to provide a drive system having good mountability. In a gap between a cylindrical outer housing (116) and a rotor (112), a layered cylindrical secondary battery is provided within the outer housing. A cylindrical cooling member (180) is further arranged between the rotor and secondary battery.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: April 10, 2012
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Hideaki Horie, Osamu Shimamura, Takamitsu Saito, Takaaki Abe
  • Patent number: 8124276
    Abstract: A bipolar battery includes: a bipolar electrode composed, by forming a positive electrode active material layer 12 an one surface of a current collector and forming a negative electrode active material layer 13 on the other surface; and a separator 14 composed to be stacked alternately with the bipolar electrode, wherein, in a single cell layer 15 composed by including the positive electrode active material layer 12, the separator 14 and the negative electrode active material layer 13, which are adjacent to one another, a thickness of the separator 14 is 0.68 times or more to less than 1.0 times a thickness of the positive electrode active material layer 12, and is 0.68 times or more to less than 1.0 times a thickness of the negative electrode active material layer 13.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: February 28, 2012
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kyoichi Watanabe, Takaaki Abe, Takamitsu Saito, Osamu Shimamura, Kenji Hosaka, Hajime Sato, Hideaki Horie
  • Publication number: 20110206990
    Abstract: A sintered lithium complex oxide characterized in that the sintered lithium complex oxide is constituted by sintering fine particles of a lithium complex oxide, the peak pore size giving the maximum differential pore volume is 0.80-5.00 ?m, the total pore volume is 0.10-2.00 mL/g, the average particle size is not less than the above-specified peak pore size but not more than 20 ?m, there is a sub-peak giving a differential pore volume not less than 10% of the maximum differential pore volume on the smaller pore size side with respect to the above-specified peak pore size, the pore size corresponding to the sub-peak is more than 0.50 ?m but not more than 2.00 ?m, the BET specific surface area of the sintered lithium complex oxide is 1.0-10.0 m2/g, and the half width of the maximum peak among X-ray diffraction peaks in an X-ray diffraction measurement is 0.12-0.30 deg.
    Type: Application
    Filed: October 7, 2009
    Publication date: August 25, 2011
    Inventors: Ryuichi Akagi, Hiroaki Kitayama, Yoshinobu Ishikawa, Kenichi Nishimura, Takamitsu Saito, Tamaki Miura, Hiroshi Miyakubo
  • Patent number: 8003015
    Abstract: The present invention provides a composite positive electrode material for a lithium ion battery, which is particularly excellent in high-rate discharge characteristics in a battery, and also provides a slurry, positive electrode and battery using the composite positive electrode material. The composite positive electrode material for a lithium ion battery contains: a positive electrode active material (a); a conductive material (b) having a primary particle diameter of 10 to 100 nm and/or a fibrous conductive material (c) having a fiber diameter of 1 nm to 1 ?m; and a conductive material (d) having an aspect ratio of 2 to 50.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: August 23, 2011
    Assignees: Kao Corporation, Nissan Motor Co., Ltd.
    Inventors: Kazuo Oki, Yasuhisa Fukumoto, Ryuichi Akagi, Kenichi Nishimura, Taketo Kaneko, Tamaki Miura, Takamitsu Saito, Mikio Kawai, Mieko Kawai, legal representative