Patents Assigned to PRIMEARTH EV ENERGY CO., LTD.
  • Patent number: 10895602
    Abstract: A state estimation device for a battery assembly including rechargeable batteries acquires battery information of each rechargeable battery, stores a battery model of the battery assembly including the battery information of a rechargeable battery, and estimates a battery state of the battery assembly based on the battery information of each rechargeable battery and the battery model. The state estimation unit estimates the battery state of the battery assembly based on the battery information of each rechargeable battery, uses the estimated battery states of the battery assembly as a state variable, and applies an optimum filter for performing optimization based on a distribution of a plurality of sample points to a state equation and an output equation included in the battery model to calculate a gain for correcting the state variable.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: January 19, 2021
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Yosuke Sugiura, Naoshi Akamine
  • Publication number: 20200313262
    Abstract: A cooling structure of a battery pack includes an assembled battery including stacked battery modules, an intake passage, and a discharge passage. Ventilation passages extend between adjacent ones of the battery modules. The intake passage extends in a stacking direction of the battery modules and includes an intake port to draw in cooling air from a blower. The discharge passage extends in the stacking direction and includes a discharge port at a first end to discharge the cooling air, which flows through the ventilation passages, to the outside. The first end of the discharge passage and the intake port of the intake passage are located at the same side. The discharge passage is defined by a wall that includes a communication portion disposed at a position toward a second end of the discharge passage opposite to the first end to partially discharge air from the exhaust passage.
    Type: Application
    Filed: March 20, 2020
    Publication date: October 1, 2020
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Ryutaro SUZUKI, Naoki FUKUSAKO, Toru HANAOKA, Shozo FUJI
  • Publication number: 20200161711
    Abstract: Provided is a manufacturing method of a compacted strip-shaped electrode plate including: an undried layer forming step of forming, on a current collector foil, a strip-shaped undried active material layer by rolling out a particle aggregate; a drying step of drying the undried active material layer to form an active material layer; and a pressing step of pressing the active material layer by rollers to compact the active material layer. The particle aggregate is a mixed particle aggregate in which first wet particles manufactured with the content ratio of conductive particles to the total solid content set to W1 and second wet particles manufactured with the content ratio of conductive particles to the total solid content set to W2, W2 being higher than W1, are mixed together.
    Type: Application
    Filed: October 2, 2019
    Publication date: May 21, 2020
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Kunihiko HAYASHI, Shun OKUDA
  • Patent number: 10658660
    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: Grant
    Filed: September 21, 2017
    Date of Patent: May 19, 2020
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Suguru Muraki, Yuki Sakito, Hiroyuki Sakamoto
  • Patent number: 10605871
    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: Grant
    Filed: September 6, 2018
    Date of Patent: March 31, 2020
    Assignees: 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: 10444293
    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: Grant
    Filed: March 11, 2015
    Date of Patent: October 15, 2019
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Yusuke Kozuka, Mitsuhiro Kamo
  • Publication number: 20190305318
    Abstract: A non-aqueous battery electrode plate including a collector and an electrode composite material layer located on the collector. The electrode composite material layer includes first particles containing an active material and second particles that are smaller than the first particles and formed from a water-repellent material. The first particles and the second particles are mixed in a thickness-wise direction of the electrode layer. The electrode composite material layer further includes a region in which the second particles are concentrated. The region includes a surface of the electrode composite material layer at a side opposite to the collector.
    Type: Application
    Filed: February 27, 2019
    Publication date: October 3, 2019
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventor: Junya HISHII
  • Patent number: 10429444
    Abstract: The present invention pertains to the detection of the state of charge of a battery, whereby the complex impedance in the diffusion region of the battery is used. An arithmetic device such as a computer determines the slope of the complex impedance at least two different frequencies in the diffusion region of a rechargeable battery when a straight-line approximation has been made. The state of charge of the rechargeable battery is detected by using the slope that has been determined, and the relationship between the state of charge and slopes that have been stored in advance in a storage means.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: October 1, 2019
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Daisuke Koba, Sachio Takeda, Katsunori Maegawa, Tetsuya Osaka
  • Publication number: 20190235027
    Abstract: A state estimation device for a battery assembly including rechargeable batteries acquires battery information of each rechargeable battery, stores a battery model of the battery assembly including the battery information of a rechargeable battery, and estimates a battery state of the battery assembly based on the battery information of each rechargeable battery and the battery model. The state estimation unit estimates the battery state of the battery assembly based on the battery information of each rechargeable battery, uses the estimated battery states of the battery assembly as a state variable, and applies an optimum filter for performing optimization based on a distribution of a plurality of sample points to a state equation and an output equation included in the battery model to calculate a gain for correcting the state variable.
    Type: Application
    Filed: January 24, 2019
    Publication date: August 1, 2019
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Yosuke SUGIURA, Naoshi AKAMINE
  • Patent number: 10355325
    Abstract: A method for reusing a vehicle rechargeable battery to rebuild an assembled battery from a plurality of battery units having a usage history is provided. The method includes measuring a remaining charge of each of a plurality of battery units obtained by dismantling an assembled battery having a usage history. The method further includes selecting from the battery units a battery unit in which the measured remaining charge is greater than or equal to a remaining charge lower limit value, which is set in a range that is greater than zero and less than a lower limit value of a remaining charge control range of a vehicle in which the assembled battery was installed, and assembling a new assembled battery using the selected battery unit.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: July 16, 2019
    Assignees: PRIMEARTH EV ENERGY CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke Koba, Shinichiro Ito, Yasushi Nakagiri, Tamotsu Fukuma, Kouichi Ichikawa, Yasuhiro Takahashi, Masahiko Mitsui
  • 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