Patents Assigned to PRIMEARTH EV ENERGY CO., LTD.
  • Publication number: 20220214404
    Abstract: A method for determining a negative electrode capacity of a rechargeable battery is performed by a measurement device that includes a voltage detector that detects a voltage value of the rechargeable battery, a current detector that detects a current value of the rechargeable battery, and a state of charge detector that detects a state of charge of the rechargeable battery. The method includes calculating an absolute value of a voltage slope indicating a voltage change amount with respect to a discharge amount when the state of charge of the rechargeable battery is less than 40%, comparing the absolute value of the voltage slope with a preset lower limit, and determining that the negative electrode capacity of the rechargeable battery has decreased when the absolute value of the voltage slope is less than or equal to the lower limit.
    Type: Application
    Filed: December 23, 2021
    Publication date: July 7, 2022
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Daisuke SHINOHARA, Daisuke KOBA
  • Patent number: 11289754
    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: Grant
    Filed: March 20, 2020
    Date of Patent: March 29, 2022
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Ryutaro Suzuki, Naoki Fukusako, Toru Hanaoka, Shozo Fuji
  • Patent number: 11271215
    Abstract: A metal porous body is a metal porous body mainly composed of nickel and having a framework of a three-dimensional network structure, Ni(OH)2 being present in a surface of the framework, when the metal porous body is subjected to at least 30 potential scans between a lower limit potential of ?0.10 V and an upper limit potential of +0.65 V with respect to a hydrogen standard potential in not less than 10% by mass and not more than 35% by mass of a potassium hydroxide aqueous solution, at least oxygen being detected within a depth of 5 nm from the surface, and hydrogen being detected at least in the surface.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: March 8, 2022
    Assignees: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC TOYAMA CO., LTD., PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Kazuki Okuno, Masatoshi Majima, Hitoshi Tsuchida, Junichi Nishimura, Koutarou Kimura, Yusuke Shimizu
  • Patent number: 11223068
    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: Grant
    Filed: October 2, 2019
    Date of Patent: January 11, 2022
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Kunihiko Hayashi, Shun Okuda
  • Patent number: 11217867
    Abstract: A manufacturing method for a secondary battery and a manufacturing apparatus for a secondary battery that are applicable to a secondary battery in which an electrolyte solution injection hole has a diameter of 1.5 mm or more are provided. The secondary battery includes a battery case including a cover plate provided with an electrolyte solution injection hole, and a sealing member sealing the electrolyte solution injection hole. The manufacturing method includes a preparing step and a press-fitting step. The preparing step is preparing a cell in which, after an electrolyte solution is injected to the battery case through the electrolyte solution injection hole, the sealing member is disposed on the electrolyte solution injection hole. The press-fitting step is press-fitting the sealing member into the electrolyte solution injection hole while applying press-fitting load and ultrasonic vibration with a frequency of 20 kHz or more in parallel to a press-fitting direction.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: January 4, 2022
    Assignees: J.E.T. CO., LTD., PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Hiroyuki Nishimura, Shigeki Hashimoto, Hideaki Yoshio, Shigeki Saito, So Kudo, Yuji Yamasaki, Kunihiro Takaoka, Hidenori Tagomori
  • Publication number: 20210408607
    Abstract: A lithium-ion rechargeable battery includes a current collector terminal and a negative terminal unit connected to the current collector terminal. The negative terminal unit is configured to conduct electricity from an inside to an outside of a battery case. The negative terminal unit is formed of copper (Cu) or its alloy and includes a fixing member fixing the battery case to the current collector terminal. The battery is manufactured by ultrasonically bonding an external terminal formed of aluminum (Al) or its alloy to the top of a negative fixing member, fitting a busbar to a negative external terminal, and laser-welding the busbar to the negative external terminal and using the welding heat to heat the external terminal that has undergone the ultrasonic bonding to form a diffusion-bonded portion and an intermolecular-bonded portion in a bonded surface of the external terminal and the negative fixing member. Thus, conductivity is increased.
    Type: Application
    Filed: June 22, 2021
    Publication date: December 30, 2021
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventor: Shigeki SAITO
  • Publication number: 20210336300
    Abstract: A rechargeable battery state determination method determines whether a rechargeable battery is in a micro-short-circuit-prone state, which is a state that is highly likely to form a micro-short circuit.
    Type: Application
    Filed: April 23, 2021
    Publication date: October 28, 2021
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Tamotsu FUKUMA, Hitoshi SUZUKI, Daisuke KOBA
  • Publication number: 20210276451
    Abstract: A battery system includes a nickel-metal hydride battery and an ECU that controls charging and discharging of the nickel-metal hydride battery. The ECU calculates a discharge electricity amount showing an integrated value of a current discharged from the nickel-metal hydride battery, and further calculates ?SOC of the nickel-metal hydride battery in a prescribed time period. The ECU calculates a charge reserve capacity of the nickel-metal hydride battery based on a temperature of the nickel-metal hydride battery, the discharge electricity amount, and the ?SOC.
    Type: Application
    Filed: February 24, 2021
    Publication date: September 9, 2021
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Takayuki IRIE, Jun SATOH, Junichi MATSUMOTO, Daisuke KOBA, Yosuke MUROTA, Kazuki NAKANO, Suguru MURAKI
  • Patent number: 10976372
    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: Grant
    Filed: December 21, 2018
    Date of Patent: April 13, 2021
    Assignee: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Daisuke Koba, Yosuke Murota, Shinobu Minatani, Hiroki Nakafuji, Daisuke Shinohara, Tetsuya Osaka
  • 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: 20200373585
    Abstract: A metal porous body is a metal porous body mainly composed of nickel and having a framework of a three-dimensional network structure, Ni(OH)2 being present in a surface of the framework, when the metal porous body is subjected to at least 30 potential scans between a lower limit potential of ?0.10 V and an upper limit potential of +0.65 V with respect to a hydrogen standard potential in not less than 10% by mass and not more than 35% by mass of a potassium hydroxide aqueous solution, at least oxygen being detected within a depth of 5 nm from the surface, and hydrogen being detected at least in the surface.
    Type: Application
    Filed: July 11, 2018
    Publication date: November 26, 2020
    Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC TOYAMA CO., LTD., PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Kazuki OKUNO, Masatoshi MAJIMA, Hitoshi TSUCHIDA, Junichi NISHIMURA, Koutarou KIMURA, Yusuke SHIMIZU
  • 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