Patents by Inventor Masato Isogai

Masato Isogai 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: 8947023
    Abstract: In a memory, the surface temperature and the internal resistance of an assembled battery detected under the condition where a difference between the surface and the internal temperature is within a predetermined value are stored, and an internal temperature diagnosis unit that diagnoses whether or not the internal temperature estimated by an internal temperature estimation unit is correct, detects the internal resistance with an internal resistance calculation unit when the internal temperature estimation unit estimates the internal temperature, searches for an internal resistance corresponding to the surface temperature equal to the estimated internal temperature value from among the stored internal resistances, and diagnoses the estimated internal temperature value based upon the result of comparison of a search result of the internal resistance and the internal resistance detected during internal temperature estimation.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: February 3, 2015
    Assignees: Hitachi, Ltd., Hitachi Automotive Systems, Ltd.
    Inventors: Youhei Kawahara, Akihiko Emori, Akihiko Kudo, Atsuo Suga, Masato Isogai, Kenji Kubo
  • Patent number: 8353374
    Abstract: A battery module includes: a plurality of battery cells; a casing in which the plurality of battery cells are housed; a plurality of conductive members used to electrically connect the plurality of battery cells; a first chamber, formed in the casing, in which the plurality of battery cells are disposed; and a second chamber, formed in the casing and isolated from the first chamber, into which emitted matter from the battery cells is released, wherein: the conductive members and the battery cells are connected together within the second chamber.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: January 15, 2013
    Assignees: Hitachi Vehicle Energy, Ltd., Hitachi, Ltd.
    Inventors: Tatsuo Sugawara, Seiichi Satoh, Yoshihisa Tsurumi, Masato Isogai, Sadashi Seto
  • Publication number: 20120256569
    Abstract: In a memory, the surface temperature and the internal resistance of an assembled battery detected under the condition where a difference between the surface and the internal temperature is within a predetermined value are stored, and an internal temperature diagnosis unit that diagnoses whether or not the internal temperature estimated by an internal temperature estimation unit is correct, detects the internal resistance with an internal resistance calculation unit when the internal temperature estimation unit estimates the internal temperature, searches for an internal resistance corresponding to the surface temperature equal to the estimated internal temperature value from among the stored internal resistances, and diagnoses the estimated internal temperature value based upon the result of comparison of a search result of the internal resistance and the internal resistance detected during internal temperature estimation.
    Type: Application
    Filed: October 14, 2009
    Publication date: October 11, 2012
    Inventors: Youhei Kawahara, Akihiko Emori, Akihiko Kudo, Atsuo Suga, Masato Isogai, Kenji Kubo
  • Publication number: 20100116570
    Abstract: A battery module includes: a plurality of battery cells; a casing in which the plurality of battery cells are housed; a plurality of conductive members used to electrically connect the plurality of battery cells; a first chamber, formed in the casing, in which the plurality of battery cells are disposed; and a second chamber, formed in the casing and isolated from the first chamber, into which emitted matter from the battery cells is released, wherein: the conductive members and the battery cells are connected together within the second chamber.
    Type: Application
    Filed: November 6, 2009
    Publication date: May 13, 2010
    Applicants: Hitachi Vehicle Energy, Ltd., Hitachi, Ltd.
    Inventors: Tatsuo SUGAWARA, Seiichi Satoh, Yoshihisa Tsurumi, Masato Isogai, Sadashi Seto
  • Patent number: 7495415
    Abstract: A DC backup power supply system having a battery a charge-discharge circuit for charging and discharging a power between the battery and a DC line and a control circuit for controlling the charge-discharge circuit, wherein the battery has a number of battery cells and cylindrical portions of the battery cells are laid on an approximately horizontal plane.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: February 24, 2009
    Assignees: Hitachi, Ltd., Hitachi Maxwell Ltd., Hitachi Computer Peripherals Co.
    Inventors: Akihiko Kanouda, Minehiro Nemoto, Fumikazu Takahashi, Masahiro Hamaogi, Yoshihide Takahashi, Takashi Tanabe, Takao Gotou, Masato Isogai, Toshikatsu Miyata
  • Patent number: 7245469
    Abstract: A reliable uninterruptible DC power supply device. The DC backup power supply device includes an AC/DC converter, a DC/DC converter, voltage step-up/down choppers and a battery connected to a DC path of a main circuit connected with a load via a switch, and a microcomputer. In the device, under control of the microcomputer, the voltage step-up/down choppers are first operated under a condition that the MOS FET was turned OFF for self diagnosis of the backup power supply device. Next, the switch is turned ON to execute the remaining self diagnosis. The DC backup power supply device can execute its self diagnosis with a reduced likelihood of danger of exerting an adverse effect on the main circuit and also can exhibit a reliable uninterruptible power supply function.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: July 17, 2007
    Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd., Hitachi Computer Peripherals Co., Ltd.
    Inventors: Minehiro Nemoto, Akihiko Kanouda, Fumikazu Takahashi, Masahiro Hamaogi, Yoshihide Takahashi, Takashi Tanabe, Takao Gotou, Masato Isogai, Toshikatsu Miyata
  • Patent number: 7157810
    Abstract: The present invention reduces the capacity of the AC-DC converter for the peak load and realizes low price and reduction in the volume of the power unit. The apparatus built-in backup power supply has the peak cut function for sharing a part of the load current at the time of peak load from the secondary battery. The two-way DC-DC converter 5 and the secondary battery 4 are installed on the DC output side of the AC-DC converter 3 and a current larger than a predetermined peak cut level is discharged from the secondary battery 4 at the time of peak load. Further, when the load is less than the predetermined cut level, the secondary battery 4 is charged from the AC-DC converter 3 via the two-way DC-DC converter 5. Furthermore, a most suitable peak cut level according to the SOC of the secondary battery and load pattern is automatically set and dynamically changed.
    Type: Grant
    Filed: January 12, 2004
    Date of Patent: January 2, 2007
    Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd., Hitachi Computer Peripherals Co., Ltd.
    Inventors: Akihiko Kanouda, Satoru Masuyama, Masato Isogai, Ryouhei Saga, Kenichi Onda, Norikazu Tokunaga
  • Patent number: 6977448
    Abstract: Apparatus built-in backup power supply system has a “peak cut” function for sharing a part of the load current at the time of a peak load using a secondary battery. For this purpose, a two-way DC—DC converter 5 and the secondary battery 4 are installed on the DC output side of the AC-DC converter 3, and that portion of the load current that exceeds a predetermined peak cut level is discharged from the secondary battery 4 during peak loading. When the load is less than the predetermined cut level, the secondary battery 4 is charged from the AC-DC converter 3 via the two-way DC—DC converter 5. A suitable peak cut level is determined according to the state of charge of the secondary battery and load pattern, and is changed dynamically.
    Type: Grant
    Filed: April 28, 2003
    Date of Patent: December 20, 2005
    Assignees: Hitachi, Ltd., Hitachi Maxwell, Ltd., Hitachi Computer Peripherals Co., Ltd.
    Inventors: Akihiko Kanouda, Satoru Masuyama, Masato Isogai, Ryouhei Saga, Kenichi Onda, Norikazu Tokunaga
  • Publication number: 20050206242
    Abstract: A DC backup power supply system having a battery a charge-discharge circuit for charging and discharging a power between the battery and a DC line and a control circuit for controlling the charge-discharge circuit, wherein the battery has a number of battery cells and cylindrical portions of the battery cells are laid on an approximately horizontal plane.
    Type: Application
    Filed: May 17, 2005
    Publication date: September 22, 2005
    Inventors: Akihiko Kanouda, Minehiro Nemoto, Fumikazu Takahashi, Masahiro Hamaogi, Yoshihide Takahashi, Takashi Tanabe, Takao Gotou, Masato Isogai, Toshikatsu Miyata
  • Publication number: 20050146223
    Abstract: An information apparatus including a DC backup power supply system for supplying DC power to the information apparatus. The DC backup power supply system includes a battery pack having a plurality of sets of battery cells, each set including a plurality of serially connected battery cells extending in one direction, and the plurality of sets of the battery cells being disposed in a second direction which is transverse to the first direction. The plurality of sets of battery cells are serially connected to one another, and at least adjacent sets of the battery cells have an insulated sheet disposed therebetween.
    Type: Application
    Filed: March 2, 2005
    Publication date: July 7, 2005
    Inventors: Akihiko Kanouda, Minehiro Nemoto, Fumikazu Takahashi, Masahiro Hamaogi, Yoshihide Takahashi, Takashi Tanabe, Takao Gotou, Masato Isogai, Toshikatsu Miyata
  • Publication number: 20040145926
    Abstract: The present invention reduces the capacity of the AC-DC converter for the peak load and realizes low price and reduction in the volume of the power unit. The apparatus built-in backup power supply has the peak cut function for sharing a part of the load current at the time of peak load from the secondary battery. The two-way DC-DC converter 5 and the secondary battery 4 are installed on the DC output side of the AC-DC converter 3 and a current larger than a predetermined peak cut level is discharged from the secondary battery 4 at the time of peak load. Further, when the load is less than the predetermined cut level, the secondary battery 4 is charged from the AC-DC converter 3 via the two-way DC-DC converter 5. Furthermore, a most suitable peak cut level according to the SOC of the secondary battery and load pattern is automatically set and dynamically changed.
    Type: Application
    Filed: January 12, 2004
    Publication date: July 29, 2004
    Inventors: Akihiko Kanouda, Satoru Masuyama, Masato Isogai, Ryouhei Saga, Kenichi Onda, Norikazu Tokunaga
  • Publication number: 20030231009
    Abstract: A reliable uninterruptible DC power supply device. The DC backup power supply device includes an AC/DC converter, a DC/DC converter, voltage step-up/down choppers and a battery connected to a DC path of a main circuit connected with a load via a switching means, and a microcomputer. In the device, under control of the microcomputer, the voltage step-up/down choppers are first operated under a condition that the MOS FET was turned OFF for self diagnosis of the backup power supply device. Next, the switching means is turned ON to execute the remaining self diagnosis. The DC backup power supply device can execute its self diagnosis with a lessened likelihood of danger of exerting an adverse effect on the main circuit and also can exhibit a reliable uninterruptible power supply function.
    Type: Application
    Filed: April 14, 2003
    Publication date: December 18, 2003
    Inventors: Minehiro Nemoto, Akihiko Kanouda, Fumikazu Takahashi, Masahiro Hamaogi, Yoshihide Takahashi, Takashi Tanabe, Takao Gotou, Masato Isogai, Toshikatsu Miyata
  • Publication number: 20030222618
    Abstract: A DC backup power supply system having a battery; a charge-discharge circuit for charging and discharging a power between the battery and a DC line; and a control circuit for controlling the charge-discharge circuit, wherein the battery has a number of battery cells and cylindrical portions of the battery cells are laid on an approximately horizontal plane.
    Type: Application
    Filed: April 14, 2003
    Publication date: December 4, 2003
    Inventors: Akihiko Kanouda, Minehiro Nemoto, Fumikazu Takahashi, Masahiro Hamaogi, Yoshihide Takahashi, Takashi Tanabe, Takao Gotou, Masato Isogai, Toshikatsu Miyata
  • Publication number: 20030184937
    Abstract: The present invention reduces the capacity of the AC-DC converter for the peak load and realizes low price and reduction in the volume of the power unit. The apparatus built-in backup power supply has the peak cut function for sharing a part of the load current at the time of peak load from the secondary battery. The two-way DC-DC converter 5 and the secondary battery 4 are installed on the DC output side of the AC-DC converter 3 and a current larger than a predetermined peak cut level is discharged from the secondary battery 4 at the time of peak load. Further, when the load is less than the predetermined cut level, the secondary battery 4 is charged from the AC-DC converter 3 via the two-way DC-DC converter 5. Furthermore, a most suitable peak cut level according to the SOC of the secondary battery and load pattern is automatically set and dynamically changed.
    Type: Application
    Filed: April 28, 2003
    Publication date: October 2, 2003
    Applicants: Hitachi, Ltd., Hitachi Maxell, Ltd., Hitachi Computer Peripherals Co., Ltd.
    Inventors: Akihiko Kanouda, Satoru Masuyama, Masato Isogai, Ryouhei Saga, Kenichi Onda, Norikazu Tokunaga
  • Patent number: 6593031
    Abstract: A nickel metal-hydride cell having a paste type nickel positive electrode containing nickel hydroxide and a cobalt conducting aid selected from the group consisting of metal cobalt and cobalt compounds, a negative electrode which comprises a hydrogen absorbing alloy having a composition of the formula: MmNi5−x+yMx in which Mm is a rare earth element, M is a metal element, 0<x<2, and −0.2<y<0.6, a separator interposed between two electrodes, and an alkaline electrolytic solution, where a ratio of C—H to C—Co(II) is 1.3 or less, wherein C—H is a quantity of electricity of a discharge reserve formed in the negative electrode, and C—Co(II) is a quantity of electricity necessary for reducing cobalt oxide in the positive electrode to cobalt(II) oxide.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: July 15, 2003
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Masuhiro Onishi, Hiroshi Fukunaga, Masato Isogai, Ryo Nagai
  • Publication number: 20020186576
    Abstract: The present invention reduces the capacity of the AC-DC converter for the peak load and realizes low price and reduction in the volume of the power unit. The apparatus built-in backup power supply has the peak cut function for sharing a part of the load current at the time of peak load from the secondary battery. The two-way DC-DC converter 5 and the secondary battery 4 are installed on the DC output side of the AC-DC converter 3 and a current larger than a predetermined peak cut level is discharged from the secondary battery 4 at the time of peak load. Further, when the load is less than the predetermined cut level, the secondary battery 4 is charged from the AC-DC converter 3 via the two-way DC-DC converter 5. Furthermore, a most suitable peak cut level according to the SOC of the secondary battery and load pattern is automatically set and dynamically changed.
    Type: Application
    Filed: February 27, 2002
    Publication date: December 12, 2002
    Inventors: Akihiko Kanouda, Satoru Masuyama, Masato Isogai, Ryouhei Saga, Kenichi Onda, Norikazu Tokunaga
  • Patent number: 6430066
    Abstract: An electric power system comprises a plurality of capacitors connected in series, a plurality of DC-AC conversion circuits converting each DC voltage of the plurality of capacitor to an AC signal that an AC component equivalent to the inter-terminal DC voltage of each of the capacitors is superimposed on the respective DC voltages and a plurality of condenser couplers break the respective DC voltages and output the AC components respectively, and a processing circuit detecting the inter-terminal DC voltage of the corresponding capacitor from the AC component.
    Type: Grant
    Filed: March 13, 2001
    Date of Patent: August 6, 2002
    Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd.
    Inventors: Akihiko Emori, Hisao Sonobe, Masato Isogai, Takuya Kinoshita
  • Publication number: 20010028573
    Abstract: A electric power system comprises a plurality of capacitors connected in series, a plurality of DC-AC conversion circuits converting each DC voltage of the plurality of capacitors to an AC signal that an AC component equivalent to the inter-terminal DC voltage of each of the capacitors is superimposed on the respective DC voltages and a plurality of condenser couplers break the respective DC voltages and output the AC components respectively, and a processing circuit detecting the inter-terminal DC voltage of the corresponding capacitor from the AC component.
    Type: Application
    Filed: March 13, 2001
    Publication date: October 11, 2001
    Inventors: Akihiko Emori, Hisao Sonobe, Masato Isogai, Takuya Kinoshita
  • Patent number: 5898607
    Abstract: A voltage of an intensity corresponding to information to be recorded is applied to a recording medium which comprises a film containing a charge generating material. The film is sandwiched between two electrodes. Electric charges are accumulated in the recording medium upon application of the voltage so that information is recorded. When light is irradiated to the recording medium, the stored charges are converted into photo-current. The recorded information is read out by detecting the photo-current. When the electrodes are short-circuited, the recorded information is erased.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: April 27, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Toshiro Saito, Shigeo Suzuki, Masato Isogai
  • Patent number: 5313293
    Abstract: A display device, which is adapted for time-division driving and is free from occurrence of crosstalk, includes a pair of substrates which are arranged to be opposite to each other and at least one of which is transparent, electrodes provided respectively on surfaces of the substrates facing each other, and a material which is sandwiched between the electrodes and the light transmitting quantity of which is changed by an electric field applied between the electrodes. The electrodes formed on the surfaces of the substrates facing each other constitute scanning electrodes and signal electrodes which intersect each other to form display portions. The signal electrodes constitutes independent electrodes formed independently of each other in units of display portions. Outside leads of the respective independent electrodes are passed through the substrate provided with the electrodes and are led out to the back surface of the substrate.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: May 17, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Jun-ichi Hirakata, Katsumi Kondo, Shuichi Ohara, Masato Isogai, Satoru Ogihara, Naoki Kikuchi