Patents by Inventor Sachie Yuasa

Sachie Yuasa 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: 9812741
    Abstract: An object is to provide a method of charging and maintaining a lithium ion secondary battery which method is capable of preventing a decrease in the capacity of the battery. Another object is to provide a battery system capable of preventing a decrease in battery capacity, and a vehicle and a battery-mounted device which have such a battery system mounted therein. A method of charging and maintaining lithium ion secondary batteries 101 using positive active material particles 135 made from a two-phase coexistence type positive active material PM in a positive electrode plate 130 includes an overcharge step S7 for charging the lithium ion secondary batteries to bring their SOC (State of Charge) SC into an overcharge SOC not higher than 100% but higher than a target SOC, a return discharge step S8 for discharging, after the overcharge step, the lithium ion secondary batteries to make their SOC equal to the target SOC, and a maintaining step S10.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: November 7, 2017
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takeshi Abe, Akira Tsujiko, Tomitaro Hara, Keiko Wasada, Sachie Yuasa
  • Patent number: 9559359
    Abstract: The lithium secondary battery positive electrode provided by the present invention has a positive electrode collector and a positive active material layer formed on the collector. The positive active material layer is composed of a matrix phase containing at least one particulate positive active material and at least one binder, and an aggregate phase dispersed in the matrix phase, constituted by aggregation of at least one particulate positive active material and containing substantially no binder.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: January 31, 2017
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tomitaro Hara, Akira Tsujiko, Takeshi Abe, Sachie Yuasa, Keiko Wasada
  • Patent number: 9362554
    Abstract: A positive electrode for a lithium secondary battery provided by the present invention includes a positive electrode active material layer having a particulate positive electrode active material constituted by a composite oxide containing lithium and at least one type of transition metal element, and at least one type of binding material constituted by a polymer compound having at least one functional group, and a conductive carbonaceous coating film is formed on a surface of the positive electrode active material. Further, the polymer compound constituting the binding material is molecularly bound to carbon atoms constituting the carbonaceous coating film of at least a part of the positive electrode active material, whereby a composite compound is formed from the polymer compound molecularly bound to the carbon atoms and a carbon network constituting the carbonaceous coating film containing the carbon atoms.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: June 7, 2016
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tomitaro Hara, Akira Tsujiko, Yohei Shindo, Sachie Yuasa
  • Patent number: 9209462
    Abstract: A lithium-ion secondary battery with excellent durability is provided using a two-phase coexisting compound as a positive electrode active material. This lithium-ion secondary battery is provided with an electrode body having a positive electrode containing a positive electrode active material and a negative electrode containing a negative electrode active material, and a non-aqueous electrolyte solution containing a lithium salt in an organic solvent. The positive electrode active material is mainly composed of a two-phase coexisting compound containing lithium, and also contains particles of a lithium-transition metal oxide with a layered structure. The particles of the layered oxide have an average particle diameter of 2 ?m or less, and the percentage content thereof in the positive electrode active material is 5 mass % or less.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: December 8, 2015
    Assignees: Toyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Tomitaro Hara, Akira Tsujiko, Sachie Yuasa, Takahito Imamine, Tsuyoshi Sasaki, Yuichi Itou, Youji Takeuchi, Osamu Hiruta, Chikaaki Okuda, Mamoru Mizutani, Hiroshi Sawada
  • Patent number: 9184446
    Abstract: A lithium ion secondary battery provided by the present invention has a positive electrode having a current collector and a positive electrode composite layer provided on the current collector. The current collector contains a metal element A as a main component thereof. The positive electrode composite layer contains a two-phase compound containing lithium as a positive electrode active material. The positive electrode composite layer also contains as an additive a compound having a metal element B, in a composition thereof, that has a higher ionization tendency than the metal element A.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: November 10, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tomitaro Hara, Akira Tsujiko, Sachie Yuasa, Takahito Imamine, Yuichi Itou, Hiroshi Sawada, Chikaaki Okuda, Osamu Hiruta, Mamoru Mizutani
  • Patent number: 8742725
    Abstract: Provided is a secondary battery system which can accurately detect a state of a secondary battery system (such as a secondary battery state and a secondary battery system failure). The secondary battery system (6) includes dV/dQ calculation means which calculates a dV/dQ value as a ratio of a change amount dV of a battery voltage V of a secondary battery (100) against a change amount dQ of an accumulation amount Q when the accumulation amount Q of the secondary battery (100) is changed. The secondary battery system (6) detects the state of the secondary battery system (6) by using the dV/dQ value.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: June 3, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Akira Tsujiko, Tomitaro Hara, Takuichi Arai, Tsuyoshi Yano, Daisuke Teramoto, Keiko Wasada, Sachie Yuasa
  • Patent number: 8629655
    Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: January 14, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takuichi Arai, Tomitaro Hara, Akira Tsujiko, Yohei Shindo, Takeshi Abe, Daisuke Teramoto, Keiko Wasada, Sachie Yuasa
  • Publication number: 20130113426
    Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.
    Type: Application
    Filed: December 20, 2012
    Publication date: May 9, 2013
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takuichi ARAI, Tomitaro HARA, Akira TSUJIKO, Yohei SHINDO, Takeshi ABE, Daisuke TERAMOTO, Keiko WASADA, Sachie YUASA
  • Publication number: 20130059199
    Abstract: A lithium-ion secondary battery with excellent durability is provided using a two-phase coexisting compound as a positive electrode active material. This lithium-ion secondary battery is provided with an electrode body having a positive electrode containing a positive electrode active material and a negative electrode containing a negative electrode active material, and a non-aqueous electrolyte solution containing a lithium salt in an organic solvent. The positive electrode active material is mainly composed of a two-phase coexisting compound containing lithium, and also contains particles of a lithium-transition metal oxide with a layered structure. The particles of the layered oxide have an average particle diameter of 2 ?m or less, and the percentage content thereof in the positive electrode active material is 5 mass % or less.
    Type: Application
    Filed: September 14, 2010
    Publication date: March 7, 2013
    Inventors: Tomitaro Hara, Akira Tsujiko, Sachie Yuasa, Takahito Imamine, Tsuyoshi Sasaki, Yuichi Itou, Youji Takeuchi, Osamu Hiruta, Chikaaki Okuda, Mamoru Mizutani, Hiroshi Sawada
  • Patent number: 8390253
    Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: March 5, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takuichi Arai, Tomitaro Hara, Akira Tsujiko, Yohei Shindo, Takeshi Abe, Daisuke Teramoto, Keiko Wasada, Sachie Yuasa
  • Patent number: 8384345
    Abstract: A control method for a lithium ion secondary battery includes performing a charging step of charging the lithium ion secondary battery with a predetermined quantity of electricity when the battery voltage of the lithium ion secondary battery has decreased to a lower limit battery voltage that is set at a value that falls within a range higher than (B?C) V and lower than or equal to (B?C+0.2) V where a maximum value of a positive electrode potential of a flat portion in a discharge positive electrode potential curve is B (V) and a negative electrode dissolution potential is C (V). It is possible to suppress a dissolution of a negative electrode current collector of the lithium ion secondary battery to prevent the service life of the lithium ion secondary battery from shortening because of an internal short circuit.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: February 26, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tomitaro Hara, Akira Tsujiko, Takuichi Arai, Tsuyoshi Yano, Daisuke Teramoto, Sachie Yuasa, Keiko Wasada
  • Publication number: 20130045417
    Abstract: A lithium ion secondary battery provided by the present invention has a positive electrode having a current collector and a positive electrode composite layer provided on the current collector. The current collector contains a metal element A as a main component thereof. The positive electrode composite layer contains a two-phase compound containing lithium as a positive electrode active material. The positive electrode composite layer also contains as an additive a compound having a metal element B, in a composition thereof, that has a higher ionization tendency than the metal element A.
    Type: Application
    Filed: October 13, 2009
    Publication date: February 21, 2013
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tomitaro Hara, Akira Tsujiko, Sachie Yuasa, Takahito Imamine, Yuichi Itou, Hiroshi Sawada, Chikaaki Okuda, Osamu Hiruta, Mamoru Mizutani
  • Patent number: 8362746
    Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: January 29, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takuichi Arai, Tomitaro Hara, Akira Tsujiko, Yohei Shindo, Takeshi Abe, Daisuke Teramoto, Keiko Wasada, Sachie Yuasa
  • Patent number: 8299800
    Abstract: The invention provides a method of diagnosing a malfunction in an abnormal voltage detecting apparatus, which includes breaking an electrical connection between a secondary battery (100) and an abnormal voltage detecting apparatus (40, 31) and connecting the abnormal voltage detecting apparatus to a direct current voltage generating portion (20) that is different from the secondary battery (100), applying direct current voltage that has a predetermined voltage value that is outside of a normal voltage range to the abnormal voltage detecting apparatus (40) using the direct current voltage generating portion, and determining that there is a malfunction in the abnormal voltage detecting apparatus if the abnormal voltage detecting apparatus does not determine that the voltage is abnormal.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: October 30, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Akira Tsujiko, Tomitaro Hara, Takuichi Arai, Yohei Shindo, Takeshi Abe, Daisuke Teramoto, Keiko Wasada, Sachie Yuasa
  • Publication number: 20120189914
    Abstract: A positive electrode for a lithium secondary battery provided by the present invention includes a positive electrode active material layer having a particulate positive electrode active material constituted by a composite oxide containing lithium and at least one type of transition metal element, and at least one type of binding material constituted by a polymer compound having at least one functional group, and a conductive carbonaceous coating film is formed on a surface of the positive electrode active material. Further, the polymer compound constituting the binding material is molecularly bound to carbon atoms constituting the carbonaceous coating film of at least a part of the positive electrode active material, whereby a composite compound is formed from the polymer compound molecularly bound to the carbon atoms and a carbon network constituting the carbonaceous coating film containing the carbon atoms.
    Type: Application
    Filed: October 2, 2009
    Publication date: July 26, 2012
    Inventors: Tomitaro Hara, Akira Tsujiko, Yohei Shindo, Sachie Yuasa
  • Publication number: 20120183851
    Abstract: The lithium secondary battery positive electrode provided by the present invention has a positive electrode collector and a positive active material layer formed on the collector. The positive active material layer is composed of a matrix phase containing at least one particulate positive active material and at least one binder, and an aggregate phase dispersed in the matrix phase, constituted by aggregation of at least one particulate positive active material and containing substantially no binder.
    Type: Application
    Filed: October 2, 2009
    Publication date: July 19, 2012
    Inventors: Tomitaro Hara, Akira Tsujiko, Takeshi Abe, Sachie Yuasa, Keiko Wasada
  • Publication number: 20120105006
    Abstract: A control method for a lithium ion secondary battery includes performing a charging step of charging the lithium ion secondary battery with a predetermined quantity of electricity when the battery voltage of the lithium ion secondary battery has decreased to a lower limit battery voltage that is set at a value that falls within a range higher than (B?C) V and lower than or equal to (B?C+0.2) V where a maximum value of a positive electrode potential of a flat portion in a discharge positive electrode potential curve is B (V) and a negative electrode dissolution potential is C (V). It is possible to suppress a dissolution of a negative electrode current collector of the lithium ion secondary battery to prevent the service life of the lithium ion secondary battery from shortening because of an internal short circuit.
    Type: Application
    Filed: June 30, 2009
    Publication date: May 3, 2012
    Inventors: Tomitaro Hara, Akira Tsujiko, Takuichi Arai, Tsuyoshi Yano, Daisuke Teramoto, Sachie Yuasa, Keiko Wasada
  • Publication number: 20120098489
    Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.
    Type: Application
    Filed: June 30, 2010
    Publication date: April 26, 2012
    Inventors: Takuichi Arai, Tomitaro Hara, Akira Tsujiko, Yohei Shindo, Takeshi Abe, Daisuke Teramoto, Keiko Wasada, Sachie Yuasa
  • Publication number: 20120068666
    Abstract: An object is to provide a method of charging and maintaining a lithium ion secondary battery which method is capable of preventing a decrease in the capacity of the battery. Another object is to provide a battery system capable of preventing a decrease in battery capacity, and a vehicle and a battery-mounted device which have such a battery system mounted therein. A method of charging and maintaining lithium ion secondary batteries 101 using positive active material particles 135 made from a two-phase coexistence type positive active material PM in a positive electrode plate 130 includes an overcharge step S7 for charging the lithium ion secondary batteries to bring their SOC (State of Charge) SC into an overcharge SOC not higher than 100% but higher than a target SOC, a return discharge step S8 for discharging, after the overcharge step, the lithium ion secondary batteries to make their SOC equal to the target SOC, and a maintaining step S10.
    Type: Application
    Filed: April 28, 2009
    Publication date: March 22, 2012
    Inventors: Takeshi Abe, Akira Tsujiko, Tomitaro Hara, Keiko Wasada, Sachie Yuasa
  • Publication number: 20110133721
    Abstract: The invention provides a method of diagnosing a malfunction in an abnormal voltage detecting apparatus, which includes breaking an electrical connection between a secondary battery (100) and an abnormal voltage detecting apparatus (40, 31) and connecting the abnormal voltage detecting apparatus to a direct current voltage generating portion (20) that is different from the secondary battery (100), applying direct current voltage that has a predetermined voltage value that is outside of a normal voltage range to the abnormal voltage detecting apparatus (40) using the direct current voltage generating portion, and determining that there is a malfunction in the abnormal voltage detecting apparatus if the abnormal voltage detecting apparatus does not determine that the voltage is abnormal.
    Type: Application
    Filed: June 24, 2009
    Publication date: June 9, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira Tsujiko, Tomitaro Hara, Takuichi Arai, Yohei Shindo, Takeshi Abe, Daisuke Teramoto, Keiko Wasada, Sachie Yuasa