Patents Assigned to Envision AESC Japan Ltd.
  • Patent number: 11563207
    Abstract: Provided is a current collector electrode sheet (10) including a slurry application area (11) formed by intermittently applying and drying a slurry containing an active material and a non-application area (12), on both surfaces of a metal foil (9), in which the application area (11) and the non-application area (12) are alternately formed in a winding direction of the metal foil (9) having a strip shape, and, in a compression step of continuously compressing the slurry application area (11) and the non-application area (12) using a pair of compression rollers in a thickness direction of the current collector electrode sheet (10), an area which is not compressed by the compression rollers, is present in a tailing portion (14) at a terminal end (13) of each application area (11).
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: January 24, 2023
    Assignee: ENVISION AESC JAPAN LTD.
    Inventors: Dai Aya, Mayuko Koyama
  • Publication number: 20230018933
    Abstract: A film (200) includes a first accommodation portion (210) and a second accommodation portion (220). The first accommodation portion (210) covers one side of the battery element (100). The second accommodation portion (220) covers the other side opposite to the one side of the battery element (100). A recessed portion (232) is formed at a portion of the film (200) folded from one of the first accommodation portion (210) and the second accommodation portion (220) to the other. The recessed portion (232) is recessed towards the battery element (100). The recessed portion (232) extends along one direction orthogonal to a direction from the one side toward the other side of the battery element (100).
    Type: Application
    Filed: November 26, 2020
    Publication date: January 19, 2023
    Applicant: ENVISION AESC JAPAN LTD.
    Inventor: Aika OOKA
  • Publication number: 20230006191
    Abstract: A positive electrode (100) includes a positive electrode current collector (110), a positive electrode mixture (120), and a mixture (130). The positive electrode current collector (110) has a first surface (112). The first surface (112) of the positive electrode current collector (110) includes a first region (112a), a second region (112b), and a third region (112c). The positive electrode (100) satisfies the following expression (1). 0?L3/(L1+L3)?0.075??(1) Here, L1 is a length of the positive electrode (100) of the first region (112a) of the positive electrode (100) in one direction (first direction (X)), and L3 is a length of the third region (112c) of the positive electrode (100) in the one direction (first direction (X)).
    Type: Application
    Filed: November 26, 2020
    Publication date: January 5, 2023
    Applicant: ENVISION AESC JAPAN LTD.
    Inventors: Koichi SHINOHARA, Shoichiro SHIRAISHI, Moeko SATO, Mikiya SAITOU, Yoshiki SATOU, Mayuko KOYAMA, Daisuke SUZUKI
  • Patent number: 11515597
    Abstract: A battery pack includes a plurality of stacked battery assemblies and an insulating spacer. The battery assemblies are provided with a pair of unit cells stacked in a thickness direction. Each unit cell includes a cell body having a power generation element and a flat shape, and an electrode tab protruding out from the cell body. The spacer is disposed between electrode tabs of the pair of the unit cells holding the electrode tabs and is electrically connected in the battery assemblies. A pair of the electrode tabs has distal end portions electrically connecting adjacent battery assemblies of the battery assemblies to each other. The distal end portions are bent in the stacking direction on a side of a surface of the insulating spacer. The distal end portions are positioned on opposite sides of the cell body. The distal end portions that are bent are electrically connected to each other.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: November 29, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventors: Masahiro Nakamoto, Gen Takayama
  • Patent number: 11462777
    Abstract: The inspection device includes a charging unit and an inspection unit, and detects the connection anomaly by retrieving a first cell voltage at the early stage of start of the constant-current charging and a second cell voltage at a stage where the charging has progressed to determine deviations from the average value of all the cell groups.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: October 4, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventors: Shiro Yonekura, Eriko Kuribayashi, Nobuhiro Takamoto
  • Patent number: 11431032
    Abstract: Provided is a method for manufacturing a mono cell having a sheet-like negative electrode, a sheet-like separator and a sheet-like positive electrode laminated in this order. In this manufacturing method, adhesives are disposed at a plurality of points on an upper surface of the negative electrode, then, the negative electrode is bonded to a lower surface of the separator, and furthermore, adhesives are disposed at a plurality of points on a lower surface of the positive electrode, then the positive electrode is bonded to an upper surface of the separator. When viewed in the lamination direction of the mono cell, the positions of the adhesives and the positions of the adhesives do not overlap each other. Then, adhesives are disposed at a plurality of points on an upper surface of the positive electrode, and a lower surface of a separator is bonded to the upper surface of the positive electrode.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: August 30, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventors: Takeshi Yamashita, Kenichi Shirai
  • Publication number: 20220271327
    Abstract: A method of manufacturing a lithium-ion secondary battery of the present invention includes at least four steps as follows: an initial charging step of charging the lithium-ion secondary battery, which has not been subjected to initial charging, under a temperature environment ranging of equal to or higher than ?20° C. and equal to or lower than 15° C.; an aging step of leaving the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than 30° C. and equal to or lower than 80° C. after the initial charging step; a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value; and a sorting step of sorting out a lithium-ion secondary battery in which no short circuit is detected.
    Type: Application
    Filed: May 4, 2022
    Publication date: August 25, 2022
    Applicant: ENVISION AESC JAPAN LTD.
    Inventors: Tomoyuki ICHIKAWA, Shinsuke ENOMOTO, Naoyuki IWATA
  • Patent number: 11411286
    Abstract: To provide a battery stack forming apparatus and a battery stack forming method that are capable of stacking electric cells with the electric cells accurately maintained in positions.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: August 9, 2022
    Assignee: ENVISION AESC JAPAN LTD.
    Inventors: Akio Kuwata, Takuro Kajitani, Hirotaka Nakayama
  • Patent number: 11400819
    Abstract: Provided is a hybrid electric vehicle in which, in accordance with the system side of the vehicle including a fuel economy-emphasized system, a wide use-range of the SOC of a lithium ion secondary battery cell can be utilized.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: August 2, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventors: Kenji Ohara, Shin Tanaka, Fumihiro Kawamura, Masanori Aoyagi, Junko Nishiyama
  • Patent number: 11355783
    Abstract: A method of manufacturing a lithium-ion secondary battery of the present invention includes at least four steps as follows: an initial charging step of charging the lithium-ion secondary battery, which has not been subjected to initial charging, under a temperature environment ranging of equal to or higher than ?20° C. and equal to or lower than 15° C.; an aging step of leaving the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than 30° C. and equal to or lower than 80° C. after the initial charging step; a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value; and a sorting step of sorting out a lithium-ion secondary battery in which no short circuit is detected.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: June 7, 2022
    Assignee: ENVISION AESC JAPAN LTD.
    Inventors: Tomoyuki Ichikawa, Shinsuke Enomoto, Naoyuki Iwata
  • Publication number: 20220173388
    Abstract: Provided is a positive electrode for a lithium ion secondary battery including a metal foil (9) (current collector), a first mixture layer (11) which is provided on one surface of the metal foil (9) and contains a positive electrode active material, and a second mixture layer (12) which is partially covered by the first mixture layer (11) and includes, as a main component, particles different from the active material, in which the second mixture layer (12) is provided on one end (11a) side of the first mixture layer (11) in a boundary portion between a formed area of the first mixture layer (11) and a non-formed area of the first mixture layer (11), one end (12a) of the second mixture layer (12) is positioned between the one surface of the metal foil (9) and a lower surface of the first mixture layer (11) in the formed area of the first mixture layer (11), and the other end (12b) is positioned in the non-formed area, and the first mixture layer (11) and the second mixture layer (12) contain a dispersed conduc
    Type: Application
    Filed: March 2, 2020
    Publication date: June 2, 2022
    Applicant: ENVISION AESC JAPAN LTD.
    Inventors: Moeko SATO, Takeshi SAITO, Shoichiro SHIRAISHI
  • Publication number: 20220166023
    Abstract: Provided is a positive electrode for a lithium ion secondary battery including a metal foil (9) (current collector), a first mixture layer (11) which is provided on one surface thereof and contains a positive electrode active material, and a second mixture layer (12) which is partially covered by the mixture layer (11) and includes insulating particles as a main component, in which the mixture layer (12) is provided on one end (11a) side of the mixture layer (11) in a boundary portion between a formed area of the mixture layer (11) and a non-formed area of the mixture layer (11), one end (12a) of the mixture layer (12) is positioned between the one surface of the metal foil (9) and a lower surface of the mixture layer (11) in the formed area of the mixture layer (11) in the formed area of the first mixture layer (11), and the other end (12b) is positioned in the non-formed area, and binding agents contained in the mixture layer (12) and the mixture layer (11) are the same, and a proportion of the binding agen
    Type: Application
    Filed: March 26, 2020
    Publication date: May 26, 2022
    Applicant: ENVISION AESC JAPAN LTD.
    Inventors: Moeko SATO, Takeshi SAITO, Shoichiro SHIRAISHI
  • Patent number: 11342640
    Abstract: A secondary battery has a battery body and a restraint. The battery body has a plurality of stacked power generation elements. The restraint restrains the battery body. The restraint has a first contact section (for applying a restraining force to an outermost layer surface (e.g., a negative electrode collector) of the battery body. The restraint is configured so that a stress occurring at a boundary of a non-contact region and a contact region of the first contact section is less than a breaking strength of the negative electrode collector, and the stress is based on the restraining force and on expansion and contraction of a negative electrode due to a change in volume of a negative electrode active material layer caused by charging and discharging.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: May 24, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventors: Sachiko Kamiya, Yoshinori Naruoka, Wataru Ogihara
  • Publication number: 20220158174
    Abstract: A battery (10) includes a positive electrode (100) and a negative electrode (200). The positive electrode (100) includes an active material layer (120) (an active material layer (122) and an active material layer (124)) and a layer (300) (a layer (310) and a layer (320)). The layer (300) is over the active material layer (120). The layer (300) contains magnesium hydroxide particles (A). The magnesium hydroxide particles (A) are surface treated with stearic acid.
    Type: Application
    Filed: March 5, 2020
    Publication date: May 19, 2022
    Applicant: Envision AESC Japan Ltd.
    Inventors: Ryota YANAGISAWA, Yoshimasa YAMAMOTO
  • Publication number: 20220158191
    Abstract: A battery (10) includes a positive electrode (100) and a first insulating layer (322). The positive electrode (100) includes a current collector (110) and a first active material layer (122). The current collector (110) includes a first surface (112) and a second surface (114). The second surface (114) is opposite to the first surface (112). The first active material layer (122) is positioned over the first surface (112) of the current collector (110). The first insulating layer (322) faces the first active material layer (122) of the positive electrode (100). The first active material layer (122) contains at least one carbon. The first insulating layer (322) contains magnesium hydroxide particles. A product of an area density and a specific surface area of the magnesium hydroxide particles is equal to or greater than 0.20 times a sum of products of an area density and a specific surface area of each of the at least one carbon.
    Type: Application
    Filed: March 5, 2020
    Publication date: May 19, 2022
    Applicant: ENVISION AESC JAPAN LTD.
    Inventors: Ryota YANAGISAWA, Yoshimasa YAMAMOTO
  • Patent number: 11329289
    Abstract: Thickener powder for a lithium-ion battery of the present invention is thickener powder that is used to thicken a water-based electrode slurry for a lithium-ion battery, the thickener powder includes a cellulose-based water-soluble polymer, and a content of a water-insoluble component in the thickener powder, which is calculated from Condition 1, is equal to or less than 1.0% by mass. (Condition 1: The thickener powder is dissolved in water, thereby obtaining a thickener aqueous solution having a concentration of 1.3% by mass. Next, the thickener aqueous solution is filtered using a filter having an average pore diameter of 1 ?m. Next, the water-insoluble component remaining on the filter is dried, and a mass of the water-insoluble component is measured. Next, the content of the water-insoluble component in the thickener powder is calculated.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: May 10, 2022
    Assignee: ENVISION AESC JAPAN LTD.
    Inventor: Takashi Inoue
  • Patent number: 11302994
    Abstract: In producing a mono-cell, the mono-cell is formed from separator, positive electrode, separator and negative electrode which are joined to each other. Negative electrode is joined, one by one, to one surface of strip of continuously conveyed separator. Positive electrode having different size from negative electrode is joined, one by one, to the other surface of separator. Strip of continuously conveyed second separator is joined to one of negative and positive electrodes. Position of negative electrode joined to separator is detected by negative electrode joining position detection cameras, and joining position of positive electrode is corrected by positive electrode alignment mechanism with this detected position of negative electrode being a reference during conveyance of positive electrode along positive electrode conveyance direction.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: April 12, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventors: Takeshi Yamashita, Takanori Satou, Kenichi Shirai
  • Patent number: 11276897
    Abstract: A stacked battery includes: a power generation element in which a plurality of electrodes and a plurality of separators are alternately stacked; an exterior member in which the power generation element is accommodated together with an electrolytic solution; and a bonding portion configured to bond an outermost layer of the power generation element and an inner side of the exterior member, wherein when the power generation element is viewed in a plan view from a stacking direction in which the electrodes and the separators are stacked, the bonding portion is located outside an effective region contributing to power generation in the power generation element and has a shape in which an outer peripheral edge of the bonding portion is continuous over an entire circumference of the bonding portion.
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: March 15, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventors: Masato Ono, Keigo Atobe, Hatsuna Seshita, Aika Kimura
  • Patent number: 11251484
    Abstract: A unit cell including a cell body, an electrode tab (an anode side electrode tab and a cathode side electrode tab) and a sealing member (laminate film). The cell body includes a power-generating element and is formed into a flat shape. The anode side electrode tab and the cathode side electrode tab extend out from the cell body. The sealing member (laminate film) includes a sheet-shaped metal layer and a sheet-shaped insulating layer that covers and insulates the metal layer from both sides to sandwich and seal the cell body. In the sealing member, an exposed end portion of a metal layer is spaced from a surface of the insulating layer, while bending at least a portion of an outer edge.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: February 15, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventors: Masahiro Nakamoto, Tsutomu Iguchi, Takao Iwasaki, Yasuhiro Yanagihara
  • Patent number: 11251488
    Abstract: To provide a highly reliable battery pack having excellent manufacturability, a battery pack according to the present invention includes a stack of a plurality of battery cells 100 that each include a positive electrode lead tab and a negative electrode lead tab led out of a laminate film casing in a same direction, a coupling assisting member 300 that assists in electrically connecting adjoining battery cells 100, and a reinforcing member 200 interposed between the stacked battery cells 100. The reinforcing member 200 includes a protrusion 240 protruding in the same direction as that in which the positive electrode lead tabs and the negative electrode lead tabs of the battery cells 100 are led out. The coupling assisting member 300 includes a guide portion 340 that engages with the protrusion 240 and guides the protrusion 240 in combining the coupling assisting member 300 and the reinforcing member 200.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: February 15, 2022
    Assignee: Envision AESC Japan Ltd.
    Inventor: Toru Suzuki