Patents Assigned to PRIMEARTH EV ENERGY CO., LTD.
  • Publication number: 20190195960
    Abstract: A battery state estimation device for estimating a charged electric charge quantity of a rechargeable battery includes an impedance measurement unit configured to measure a plurality of complex impedances of the rechargeable battery by supplying measurement power to the rechargeable battery, a parameter calculation unit configured to calculate a parameter that includes a ratio of a difference between measurement angular velocities of two complex impedances in a diffusion region among the measured complex impedances to a difference between components of the two complex impedances, and an electric charge quantity estimation unit configured to estimate a charged electric charge quantity of the rechargeable battery based on the calculated parameter and preset correlated information between the charged electric charge quantity of the rechargeable battery and the parameter.
    Type: Application
    Filed: December 21, 2018
    Publication date: June 27, 2019
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Daisuke KOBA, Yosuke MUROTA, Shinobu MINATANI, Hiroki NAKAFUJI, Daisuke SHINOHARA, Tetsuya OSAKA
  • Patent number: 10281530
    Abstract: A battery capacity measuring device that measures the battery capacity of a rechargeable battery includes an impedance measurement unit that measures the complex impedance of a rechargeable battery, which is a subject to measurement, based on application of measurement AC power, a parameter calculation unit that calculates a parameter that is a ratio of a difference between measured angular speeds of two complex impedances having different measured angular speeds in a diffusion region among a plurality of measured complex impedances to a difference between components of the two complex impedances, and a capacity calculation unit that calculates the capacity of the rechargeable battery based on information that is set in advance and indicates the relationship between the capacity of the rechargeable battery and the parameter and a parameter calculated by the parameter calculation unit.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: May 7, 2019
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Hiroki Nishi, Daisuke Koba, Tetsuya Osaka
  • Patent number: 10259074
    Abstract: A welding mode determination device that determines a welding mode when laser beam welding is performed includes an obtaining unit that obtains an image in an infrared wavelength region and an image in a short wavelength region of visible light from a laser irradiation area and its vicinity. An extraction unit extracts a light emitting image from the image in the infrared wavelength region and a light emitting image from the image in the short wavelength region of visible light. A determination unit compares the light emitting image of the image in the infrared wavelength region and the light emitting image of the image in the short wavelength region of visible light and determines the welding mode when the laser beam welding is performed based on a comparison result.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: April 16, 2019
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventor: Shigeki Saito
  • Publication number: 20190079140
    Abstract: A method for determining a state of a rechargeable battery includes obtaining a complex impedance measured by applying AC voltage or AC current to a rechargeable battery that is subject to determination and determining a state of the rechargeable battery based on the obtained complex impedance. The determining a state of the rechargeable battery includes determining whether or not a first capacity shift is occurring based on a comparison of a value of the complex impedance at a predetermined frequency with a first determination value used to determine a negative electrode capacity shift, and when determined that the first capacity shift is not occurring, determining whether or not a second capacity shift is occurring based on a comparison of a gradient of the complex impedance with respect to a real axis in a diffusion resistance region with a second determination value used to determine a positive electrode capacity shift.
    Type: Application
    Filed: September 6, 2018
    Publication date: March 14, 2019
    Applicants: PRIMEARTH EV ENERGY CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi MATSUNO, Shinichiro ITO, Yasushi NAKAGIRI, Daisuke KOBA, Tamotsu FUKUMA, Junta IZUMI, Kazuya KODAMA, Masahiko MITSUI
  • Patent number: 10218037
    Abstract: A method for regenerating a nickel metal hydride battery is provided. The nickel metal hydride battery includes a hydrogen absorbing alloy that serves as a negative electrode material and a safety valve that opens when an internal pressure of a battery case is greater than or equal to a predetermined pressure. The method includes connecting a plurality of nickel metal hydride batteries in parallel. Each nickel metal hydride battery is formed by integrating one or more battery cells. The method further includes overcharging the nickel metal hydride batteries by supplying current from a charge unit that is connected in parallel to the nickel metal hydride batteries. The method further includes, when each nickel metal hydride battery is overcharged, restoring a discharge reserve of a negative electrode by releasing at least some of an oxygen gas generated at a positive electrode out of the battery case through the safety valve.
    Type: Grant
    Filed: July 2, 2017
    Date of Patent: February 26, 2019
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Daisuke Koba, Yasushi Nakagiri, Tamotsu Fukuma, Shinichiro Ito
  • Patent number: 10120032
    Abstract: Provided is a device for estimating secondary cell status using multiple models. The device for estimating secondary cell status uses multiple models, model 1, model 2, and model 3, to estimate the status of respective secondary cells. An arithmetic unit compares the estimated voltage values obtained from model 1, model 2, and model 3 with measured voltage values, sets the model having the highest correlation as the optimal model, optimizes the parameters of such model, and estimates secondary cell status.
    Type: Grant
    Filed: September 18, 2012
    Date of Patent: November 6, 2018
    Assignee: Primearth EV Energy Co., Ltd.
    Inventor: Naoshi Akamine
  • Patent number: 10103362
    Abstract: A rechargeable battery includes a battery case, a cover that closes an open end of the battery case, and a power collection terminal arranged on the cover to supply power from a power generating element to an external terminal. The power collection terminal extends through a gasket arranged on a lower surface of the cover, an insulator arranged on an upper surface of the cover, and the external terminal arranged on an upper surface of the insulator. An annular sealing member is held between the lower surface of the cover and the gasket. The insulator is a resin-molded component. The insulator includes a through hole defined by an inner wall that includes a lower open end, an upper open end, and a central portion. At least one of the lower open end and the upper open end has a larger diameter than the central portion.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: October 16, 2018
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Kaoru Kajita, Makoto Imamura, Hajime Konishi
  • Patent number: 10062938
    Abstract: An assembled battery is formed by combining battery modules. Each battery module includes at least one battery cell and a rectangular box-shaped case that accommodates the at least one battery cell. The battery modules include a first battery module and a second battery module located adjacent to each other. The case of each of the first battery module and the second battery module includes an opposing side surface that is opposed to one of the first battery module and the second battery module. Each opposing side surface includes projections, which are laid out in rows, and ribs, which extend parallel to the layout direction of the projections. The ribs are smaller in height than the first projections. The ribs include connection ribs that connect the projections located in a predetermined range in the layout direction of the projections.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: August 28, 2018
    Assignees: PRIMEARTH EV ENERGY CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yasuaki Hada, Hiroki Tadauchi, Yasuhiro Otsuka, Hirotaka Watanabe
  • Patent number: 10052719
    Abstract: A laser welding device that laser-welds a lid to an open portion of a casing emits a laser beam to a joining subject portion including an inner side surface of the casing that defines the open portion and a peripheral surface of the lid that faces the inner side surface of the casing. The inner side surface of the casing and the peripheral surface of the lid are arranged to form a groove in between, and include inclined surfaces that function as a sliding portion. The groove portion has a groove width that is variable by sliding the sliding portion. A detection unit detects the groove width of the groove portion. An adjustment force application unit applies force for adjusting the groove width to the casing. A control unit controls the force applied by the adjustment force application unit in accordance with the groove width detected by the detection unit.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: August 21, 2018
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Shigeki Saito, Nobuaki Sakayanagi
  • Patent number: 9995792
    Abstract: A battery state determination device, which determines a micro-short-circuiting tendency state, includes an impedance meter that applies an AC voltage or an AC current of a measurement frequency to a rechargeable battery, which is subject to determination, and measures complex impedance. The device further includes a detector that detects an absolute value of an imaginary axis component of the complex impedance. The device further includes a determiner that compares the absolute value of the imaginary axis component detected by the detector with a lower limit threshold value. The lower limit threshold value is set based on a measurement result of the absolute value of the imaginary axis component of the rechargeable battery in the micro-short-circuiting tendency state. When the absolute value of the imaginary axis component is smaller than the lower limit threshold value, the determiner determines that the rechargeable battery is in the micro-short-circuiting tendency state.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: June 12, 2018
    Assignees: PRIMEARTH EV ENERGY CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Koba, Sachio Takeda, Koichi Ichikawa, Yasuhiro Takahashi, Masahiko Mitsui
  • Publication number: 20180090754
    Abstract: A nickel-metal hydride battery is provided with a positive electrode and a negative electrode including hydrogen absorbing alloys. The hydrogen absorbing alloys of the negative electrode include a first hydrogen absorbing alloy and a second hydrogen absorbing alloy having a higher hydrogen equilibrium dissociation pressure than the first hydrogen absorbing alloy. Each hydrogen absorbing alloy includes an element A having high affinity for hydrogen and an element B having low affinity for hydrogen. The ratio of a substance amount of the element B to a substance amount of the element A is greater in the second hydrogen absorbing alloy than the first hydrogen absorbing alloy.
    Type: Application
    Filed: September 21, 2017
    Publication date: March 29, 2018
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Suguru MURAKI, Yuki SAKITO, Hiroyuki SAKAMOTO
  • Publication number: 20180067169
    Abstract: A battery capacity measuring device that measures the battery capacity of a rechargeable battery includes an impedance measurement unit that measures the complex impedance of a rechargeable battery, which is a subject to measurement, based on application of measurement AC power, a parameter calculation unit that calculates a parameter that is a ratio of a difference between measured angular speeds of two complex impedances having different measured angular speeds in a diffusion region among a plurality of measured complex impedances to a difference between components of the two complex impedances, and a capacity calculation unit that calculates the capacity of the rechargeable battery based on information that is set in advance and indicates the relationship between the capacity of the rechargeable battery and the parameter and a parameter calculated by the parameter calculation unit.
    Type: Application
    Filed: August 31, 2017
    Publication date: March 8, 2018
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Hiroki NISHI, Daisuke KOBA, Tetsuya OSAKA
  • Patent number: 9882203
    Abstract: A method for manufacturing an alkaline battery includes assembling an alkaline battery with a positive electrode, a negative electrode, a separator, and an electrolyte. The positive electrode includes cobalt and a positive electrode active material particle, which has a main component that is nickel hydroxide. The positive electrode active material particle has a coating layer that includes cobalt oxyhydroxide. At least one of the positive electrode, the negative electrode, and the electrolyte includes a tungsten element. The method further includes charging the assembled alkaline battery so that the cobalt in the positive electrode is deposited as cobalt oxyhydroxide on a surface of the positive electrode active material particle.
    Type: Grant
    Filed: August 29, 2015
    Date of Patent: January 30, 2018
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Kenichi Maehara, Kazuki Nakano, Hiroyuki Sakamoto
  • Patent number: 9880225
    Abstract: This battery state determination device (10) is provided with: a voltage detection unit (13) that detects the voltage (V) of a rechargeable battery (M) to be evaluated; a current detection unit (12) that detects the current of the rechargeable battery (M); a charge state detection unit (11) that detects the state of charge (SOC) of the rechargeable battery (M); and a determination unit (11) configured so as to calculate the absolute value of the voltage gradient (G), which indicates the change in voltage with respect to the discharge amount (Ah), when the state of charge (SOC) of the rechargeable battery (M) is less than 40%, compare the absolute value of the voltage gradient (G) to a pre-set upper limit value (Gmax), and, when the absolute value of the voltage gradient (G) is greater than the upper limit value (Gmax), determine that a small short circuit has occurred in the rechargeable battery (M).
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: January 30, 2018
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Daisuke Koba, Sachio Takeda, Koichi Ichikawa, Yasuhiro Takahashi, Masahiko Mitsui
  • Publication number: 20180013177
    Abstract: A method for regenerating a nickel metal hydride battery is provided. The nickel metal hydride battery includes a hydrogen absorbing alloy that serves as a negative electrode material and a safety valve that opens when an internal pressure of a battery case is greater than or equal to a predetermined pressure. The method includes connecting a plurality of nickel metal hydride batteries in parallel. Each nickel metal hydride battery is formed by integrating one or more battery cells. The method further includes overcharging the nickel metal hydride batteries by supplying current from a charge unit that is connected in parallel to the nickel metal hydride batteries. The method further includes, when each nickel metal hydride battery is overcharged, restoring a discharge reserve of a negative electrode by releasing at least some of an oxygen gas generated at a positive electrode out of the battery case through the safety valve.
    Type: Application
    Filed: July 2, 2017
    Publication date: January 11, 2018
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Daisuke KOBA, Yasushi NAKAGIRI, Tamotsu FUKUMA, Shinichiro ITO
  • Patent number: 9843036
    Abstract: A method for manufacturing an alkaline battery includes assembling an alkaline battery with a positive electrode, a negative electrode, a separator, and an electrolyte. The positive electrode includes cobalt and a positive electrode active material particle, which has a main component that is nickel hydroxide. The positive electrode active material particle has a coating layer that includes cobalt oxyhydroxide. At least one of the positive electrode, the negative electrode, and the electrolyte includes a tungsten element. The method further includes charging the assembled alkaline battery so that the cobalt in the positive electrode is deposited as cobalt oxyhydroxide on a surface of the positive electrode active material particle.
    Type: Grant
    Filed: August 29, 2015
    Date of Patent: December 12, 2017
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Kenichi Maehara, Kazuki Nakano, Hiroyuki Sakamoto
  • Publication number: 20170299658
    Abstract: A battery voltage measurement circuit measures voltages at a plurality of rechargeable batteries. The rechargeable batteries are connected to a flying capacitor via input-side semiconductor switches. The capacitor is connected to inverting input terminals of first and second differential amplification circuits. Output terminals of the differential amplification circuits are directly or indirectly connected to a calculation unit that calculates voltages at the rechargeable batteries. The output terminal and the inverting input terminal of each differential amplification circuit are connected via a corresponding sub-capacitor. Each differential amplification circuit includes a non-inverting input terminal connected to a reference potential. The negative electrode of the rechargeable battery is connected to the reference potential via a leakage detection circuit.
    Type: Application
    Filed: March 11, 2015
    Publication date: October 19, 2017
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Yusuke KOZUKA, Mitsuhiro KAMO
  • Publication number: 20170222194
    Abstract: A rechargeable battery includes a battery case, a cover that closes an open end of the battery case, and a power collection terminal arranged on the cover to supply power from a power generating element to an external terminal. The power collection terminal extends through a gasket arranged on a lower surface of the cover, an insulator arranged on an upper surface of the cover, and the external terminal arranged on an upper surface of the insulator. An annular sealing member is held between the lower surface of the cover and the gasket. The insulator is a resin-molded component. The insulator includes a through hole defined by an inner wall that includes a lower open end, an upper open end, and a central portion. At least one of the lower open end and the upper open end has a larger diameter than the central portion.
    Type: Application
    Filed: December 28, 2016
    Publication date: August 3, 2017
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Kaoru KAJITA, Makoto IMAMURA, Hajime KONISHI
  • Publication number: 20170194635
    Abstract: This alkaline storage battery cathode is provided with: nickel hydroxide particles covered by a cobalt-compound coating layer; a zinc compound; and an yttrium compound and/or an ytterbium compound. The zinc compound and the yttrium compound and/or ytterbium compound are blended at a blend ratio that is in accordance with the ratio of the capacity characteristics of the alkaline storage battery and the output characteristics of the alkaline storage battery.
    Type: Application
    Filed: March 21, 2017
    Publication date: July 6, 2017
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: So KUDO, Kenichi MAEHARA, Sachio TAKEDA, Kazuhiro OOKAWA, Satoru TAKEHARA, Hiroyuki SAKAMOTO
  • Patent number: 9692088
    Abstract: This method for restoring battery capacity is provided with an oxygen-generating/exhausting step for charging a nickel-metal-hydride storage battery, causing the generation of oxygen gas in a positive electrode, opening a safety valve device, and discharging at least a portion of the oxygen gas through the safety valve device to the outside of the battery. The battery temperature when starting the step is in the range of ?30 to 10° C. and the SOC is in the range of (30-Ta) to 100%, or the battery temperature (Ta) is in the range of 10 to 50° C. and the SOC is in the range of 20-100%.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: June 27, 2017
    Assignees: PRIMEARTH EV ENERGY CO., LTD, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Koba, Sachio Takeda, Koichi Ichikawa, Yasuhiro Takahashi, Masahiko Mitsui