Patents Assigned to NEC Energy Devices, Ltd.
  • Publication number: 20210210761
    Abstract: An electrode comprising an active material layer comprising an active material and a first resin, the active material layer being formed on at least one surface of a current collector, and an active material layer non-formation portion having no active material layer formed thereon, wherein a boundary between the active material layer and the active material layer non-formation portion is covered with an insulating layer, and the insulating layer comprises a third resin; and a heat resistant layer covering the surface of the active material layer is formed, the heat resistant layer overlaps with the insulating layer at an end portion of the active material layer, and the heat resistant layer comprises a fourth resin.
    Type: Application
    Filed: March 6, 2017
    Publication date: July 8, 2021
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Kazuya MIMURA
  • Publication number: 20200303744
    Abstract: The present invention has an object to provide a lithium secondary battery having excellent battery characteristics and an electrode materializing the battery, by making it easy for an electrolyte solution or a solid electrolyte being an ionic conductor to penetrate between active materials even under a low porosity condition, in a technique for raising the electrode density by making the porosity of the electrode low in order to raise the energy density.
    Type: Application
    Filed: March 21, 2017
    Publication date: September 24, 2020
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventors: Yuukou KATOU, Yasutaka KONO
  • Publication number: 20200303776
    Abstract: A non-aqueous electrolytic solution secondary battery including a positive electrode including a positive electrode active material capable of intercalating and deintercalating a lithium ion; a negative electrode including a negative electrode active material capable of intercalating and deintercalating a lithium ion; a non-aqueous electrolytic solution containing a lithium ion; and an outer package, wherein the positive electrode active material includes a lithium-containing composite oxide having a layered rock salt structure and represented by the following composition formula: LiNixCoyMnzO2, provided that 0.7?x?0.9, 0.05?y?0.2, 0.05?z?0.15, and x+y+z=1 are satisfied, and the battery is formed by using the non-aqueous electrolytic solution containing methylene methanedisulfonate and having a content thereof of 2.0% by mass or more and 5.0% by mass or less based on a solvent.
    Type: Application
    Filed: February 23, 2017
    Publication date: September 24, 2020
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Kenji WATANABE
  • Publication number: 20200295345
    Abstract: A method of manufacturing electrodes for an electrochemical device in which each of electrodes comprises a current collector 9, 11 and active material layers 10, 12 using four die heads 15a-15d is described. The active material layers 10, 12 each contains a lower active material layer 10a, 12a and an upper active material layer 10b, 12b. While the current collector 9, 11 is being conveyed, a slurry is ejected from the die head 15a that is on the most upstream side in the direction of conveyance S and the die head 15b located on the second from the upstream side to form the lower active material layers 10a, 12a of two electrodes, and a slurry is ejected from the die head 15c located on the third from the upstream side and the die head 15d located on the fourth from the upstream side to form the upper active material layers 10b, 12b of two electrodes.
    Type: Application
    Filed: December 26, 2016
    Publication date: September 17, 2020
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventors: Masanori HIRAI, Kenji SATO
  • Publication number: 20200220171
    Abstract: There is provided a positive electrode for a lithium ion secondary battery, comprising a current collector and a positive electrode active material layer on the current collector, wherein the positive electrode active material layer comprises a positive electrode active material, a conductive auxiliary agent and a binder; a porosity of the positive electrode active material layer is 20% or lower; the positive electrode active material comprises a lithium composite oxide, and a BET specific surface area of the positive electrode active material is 0.1 to 1 m2/g; at least a part of the conductive auxiliary agent comprises spherical amorphous carbon particles; and a content of the conductive auxiliary agent is 1.8 to 6% by mass with respect to the positive electrode active material.
    Type: Application
    Filed: September 21, 2016
    Publication date: July 9, 2020
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Ai FUJISAWA
  • Publication number: 20190280283
    Abstract: An electrode for a lithium-ion battery (100) of the present invention includes a collector layer (101) and an electrode active material layer (103) which is provided on at least one surface of the collector layer (101) and includes an electrode active material, a binder resin, and a conductive auxiliary agent, and an interface resistance between the collector layer (101) and the electrode active material layer (103), which is measured at a normal pressure by bringing an electrode probe into contact with a surface of the electrode active material layer (103), is more than 0.0010 ?·cm2 and less than 0.10 ?·cm2.
    Type: Application
    Filed: July 19, 2017
    Publication date: September 12, 2019
    Applicant: NEC Energy Devices, Ltd.
    Inventor: Yumi SAITOU
  • Publication number: 20190273246
    Abstract: An electrode for a lithium-ion battery (100) of the present invention is a high-density electrode for a lithium-ion battery (100) including a collector layer (101), and a negative electrode active material layer (103) which is provided on at least one surface of the collector layer (101) and includes a negative electrode active material, a water-based binder resin, a thickener, and a conductive auxiliary agent, in which a density of the negative electrode active material layer (103) is equal to or more than 1.55 g/cm3, and an electrolytic solution soaking time into an electrode, which is measured using the following method 1, is equal to or longer than 10 seconds and equal to or shorter than 55 seconds. (Method 1: In a temperature environment of 25° C., 5 ?L of an electrolytic solution obtained by dissolving LiPF6 as an electrolyte in a solvent mixture of ethylene carbonate and diethyl carbonate (a volume ratio between ethylene carbonate and diethyl carbonate is 3:7) so as to obtain a concentration of 1.
    Type: Application
    Filed: June 23, 2017
    Publication date: September 5, 2019
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Yasutaka KONO
  • Publication number: 20190242950
    Abstract: An information processing apparatus (2000) detects a battery cell in which an abnormality (for example, leakage) occurs among a plurality of battery cells connected in series. A first differential voltage acquisition unit (2020) acquires a first differential voltage for each of the plurality of battery cells. The first differential voltage of the battery cell is a difference between a voltage of the battery cell after charging is completed and a voltage of the battery cell at a time when an operation is performed for a predetermined time after charging is completed. A determination unit (2040) determining that an abnormality occurs in a first battery cell, in a case where a difference between the first differential voltage of the first battery cell and the first differential voltage of a battery cell having a next largest first differential voltage of the first battery cell, is greater than or equal to a first predetermined value.
    Type: Application
    Filed: June 7, 2017
    Publication date: August 8, 2019
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Mayuko KISHI
  • Publication number: 20190237745
    Abstract: An object of the present invention is to provide a high-quality secondary battery having high electric characteristics and high reliability, the secondary battery preventing a shortcut between a positive electrode and a negative electrode by means of an insulating material and preventing or reducing an increase in volume and deformation of a battery electrode assembly, and a method for manufacturing the same. Secondary battery 100 according to the present invention includes a battery electrode assembly including positive electrode 1 and negative electrode 6 alternately stacked via separator 20. Positive electrode 1 and negative electrode 2 each includes current collector 3 or 8 and active material 2 or 7 applied to current collector 3 or 8.
    Type: Application
    Filed: April 10, 2019
    Publication date: August 1, 2019
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Tetsuya SATO
  • Publication number: 20190237746
    Abstract: An object of the present invention is to provide a high-quality secondary battery having high electric characteristics and high reliability, the secondary battery preventing a shortcut between a positive electrode and a negative electrode by means of an insulating material and preventing or reducing an increase in volume and deformation of a battery electrode assembly, and a method for manufacturing the same. Secondary battery 100 according to the present invention includes a battery electrode assembly including positive electrode 1 and negative electrode 6 alternately stacked via separator 20. Positive electrode 1 and negative electrode 2 each includes current collector 3 or 8 and active material 2 or 7 applied to current collector 3 or 8.
    Type: Application
    Filed: April 10, 2019
    Publication date: August 1, 2019
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Tetsuya SATO
  • Publication number: 20190207413
    Abstract: A first communication network (3020) communicably connects each battery module (2000). A second communication network (3040) is configured in a linear topology. Each battery module (2000) can communicate with another battery module (2000) adjacent on the second communication network (3040). An identifier information transmission unit (2020) transmits identifier information to all of the other battery modules (2000) through the first communication network (3020). An identifier information reception unit (2040) receives the identifier information through the first communication network (3020). A first notification execution unit (2060) performs first notification through the second communication network (3040). A first notification detection unit (2080) detects the first notification through the second communication network (3040). A determination unit (2100) determines whether or not a first identifier of the battery module (2000) is a duplicate of the first identifier of the other battery module (2000).
    Type: Application
    Filed: April 13, 2017
    Publication date: July 4, 2019
    Applicants: NEC Energy Devices, Ltd., NEC Corporation
    Inventors: Hiroaki UENO, Keiji KATAYAMA
  • Patent number: 10340550
    Abstract: Provided is a lithium ion secondary cell using lithium manganese-based oxide as a positive electrode active material, wherein SEI films suppressing deterioration during repeated charge/discharge are easily formed not only on the negative electrode surface, but also on the positive electrode surface, deterioration in capacity upon use, in particular, under high-temperature environments is suppressed, charge/discharge cycle characteristics are improved and lifespan is lengthened. The lithium ion secondary cell includes a positive electrode active material layer containing lithium manganese-based oxide as a positive electrode active material, a negative electrode active material layer containing a negative electrode active material, and an electrolytic solution used to immerse the positive electrode active material layer and the negative electrode active material layer, wherein the positive electrode active material layer contains carbon nanotubes and the electrolytic solution contains sulfonic acid ester.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: July 2, 2019
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventor: Takeshi Azami
  • Publication number: 20190189978
    Abstract: An electrochemical device comprising an electrode assembly in which two types of electrodes are stacked or wound with separators interposed therebetween and an outer container that accommodates the electrode assembly; wherein electrode terminals extend to the outside from within the outer container. The films which cover the electrode assembly overlap each other on the outside of the outer peripheral portion of the electrode assembly, and the outer container is formed by bonding the films to each other. The portion of the films that overlap and are bonded to each other comprises a first sealed portion in which the films overlap and are bonded to each other in an overlapping state with the electrode terminals interposed therebetween, and comprises a second sealed portion in which the films are bonded to each other in a directly overlapping state without interposition of the electrode terminals.
    Type: Application
    Filed: July 24, 2017
    Publication date: June 20, 2019
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Naoyuki IWATA
  • Publication number: 20190181392
    Abstract: In order to provide a battery having excellent vibration resistance and shock resistance, the battery according to the present invention includes an electrode laminated body 60 formed by laminating a positive electrode 20, a negative electrode 30, and a separator 40 and a laminate film exterior material 80 that houses the electrode laminated body 60 and an electrolytic solution. The static friction coefficient between the negative electrode 30 and the inner surface of the laminate film exterior material 80 is 0.1 or larger.
    Type: Application
    Filed: July 5, 2017
    Publication date: June 13, 2019
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Hiroo TAKAHASHI
  • Publication number: 20190181414
    Abstract: This battery is provided with: an electrode assembly (20) resulting from stacking a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode, and an external sheathing film (12) composed of a pair of resin layers, of which outer peripheries are heat-welded together, and that sandwich the electrode assembly (20). At least one of the electrode assembly has a protruding part (24) that protrudes from the electrodes, and is interposed at a peripheral area by the welded portion of the external sheathing film (12), and that restrains movement of the separators.
    Type: Application
    Filed: April 25, 2017
    Publication date: June 13, 2019
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventor: Kento TAKAHASHI
  • Patent number: 10305088
    Abstract: An object of the present invention is to provide a high-quality secondary battery having high electric characteristics and high reliability, the secondary battery preventing a shortcut between a positive electrode and a negative electrode by means of an insulating material and preventing or reducing an increase in volume and deformation of a battery electrode assembly, and a method for manufacturing the same. Secondary battery 100 according to the present invention includes a battery electrode assembly including positive electrode 1 and negative electrode 6 alternately stacked via separator 20. Positive electrode 1 and negative electrode 2 each includes current collector 3 or 8 and active material 2 or 7 applied to current collector 3 or 8.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: May 28, 2019
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventor: Tetsuya Sato
  • Patent number: 10305108
    Abstract: A graphite-based active material including: a first composite particle including a first graphite core particle and a first non-graphite-based carbon material covering the surface of the first graphite core particle; and a second composite particle including a second graphite core particle and a second non-graphite-based carbon material covering the surface of the second graphite core particle, wherein the mass fraction of the second non-graphite-based carbon material in the second composite particle, mass fraction B, is 5% by mass or more and more than the mass fraction of the first non-graphite-based carbon material in the first composite particle, mass fraction A, and the proportion of the second composite particle to the total of the first composite particle and the second composite particle is 1% by mass or more.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: May 28, 2019
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventor: Shin Tanaka
  • Patent number: 10290839
    Abstract: Secondary battery 100 comprises: battery electrode assembly (electrode laminate) 4 that includes positive electrodes 1 and negative electrodes 2 that overlap each other with separator 3 interposed therebetween; and conductive adhesive tape 5 which has a multilayer structure including adhesive layer 5a and conductive layer 5b, wherein adhesive layer 5a has conductivity and adhesiveness and adheres to a surface of battery electrode assembly 4, conductive layer 5b is laminated on adhesive layer 5a, and conductive adhesive tape 5 has electric resistance of 1.0 ?/cm2 or less in a thickness direction and covers at least a part of an outer peripheral portion of battery electrode assembly 4 by being wound around said part.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: May 14, 2019
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventor: Akihiro Modeki
  • Patent number: 10290854
    Abstract: Provided is a method of manufacturing paste for manufacturing of a negative electrode of a lithium ion secondary battery which contains a graphite material, a conductive auxiliary agent, a thickening agent, and a water-based binder. The method includes: a process (A) of dry-mixing the graphite material and the conductive auxiliary agent to prepare a mixture containing the graphite material and the conductive auxiliary agent; a process (B) of adding an aqueous solution, which contains the thickening agent, to the mixture, and wet-mixing the resultant mixture to prepare a paste precursor; and a process (C) of adding an aqueous emulsion solution, which contains the water-based binder, to the paste precursor, and additionally wet-mixing the resultant mixture to prepare the paste for manufacturing of a negative electrode.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: May 14, 2019
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventor: Kou Ishiguchi
  • Patent number: 10270121
    Abstract: A secondary battery includes a battery electrode assembly in which positive electrode 1 and negative electrode 6 are stacked alternately with separator 20 interposed therebetween. Positive electrode 1 and negative electrode 6 each have current collector 3, 8 and active material 2, 7. Each surface of current collectors 3, 8 has a coated portion and an uncoated portion of active materials 2, 8. Active material 2, 7 has inclined portions 2a, 7a having decreasing thickness. Insulators 40 are arranged to cover boundaries 4a between the coated portion and the uncoated portion of positive electrode 1. One or both of insulators 40 on both surfaces of positive electrode current collector 3 have one end 40a which is located on inclined surface 2a and which is opposite to inclined portion 7a of one or both of active materials 7 on both surfaces of negative electrode current collector 3, and have other end 40b which is located on uncoated portion of positive electrode 1.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: April 23, 2019
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventor: Keiji Ide