Patents by Inventor Tomokazu Kumeuchi
Tomokazu Kumeuchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9472796Abstract: The present invention relates to a stacked secondary battery that includes a laminated body, the laminated body including: a first electrode (10) in which a first electrode active material (12) is applied to both surfaces of a sheet-shaped collector (11), the first electrode having a first region (11a) to which the first electrode active material has been applied and a second region (11b) to which the first electrode active material has not been applied; a second electrode (20) in which a second electrode active material (22) different in polarity from the first electrode active material is applied to both surfaces (21) of a sheet-shaped collector; and a porous separator (30), the first and second electrodes being stacked via the porous separator, the first and second electrodes being stacked via the porous separator.Type: GrantFiled: September 9, 2011Date of Patent: October 18, 2016Assignee: NEC ENERGY DEVICES, LTD.Inventors: Shinsuke Enomoto, Tomokazu Kumeuchi
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Patent number: 8814955Abstract: There is provided a lithium ion secondary battery exhibiting a high capacity retention rate over a long period.Type: GrantFiled: September 30, 2010Date of Patent: August 26, 2014Assignee: NEC Energy Devices, Ltd.Inventors: Tomokazu Kumeuchi, Koichi Zama, Daisuke Kono
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Publication number: 20140038002Abstract: The invention provides a closed type battery comprising a battery element covered with a covering film and a heat fusion seal portion formed by heat fusion on a periphery of the covering film, wherein the cleaving strength upon an internal pressure rise of a seal portion positioned between a positive electrode terminal and a negative electrode terminal is larger than that of any other seal portion, and a safety valve adapted to release pressure upon a battery's internal pressure rise is located at a portion other than said inter-terminal seal portion. The invention also provides an assembled battery wherein a plurality of closed type batteries are stacked one upon another while a safety valve adapted to release pressure upon an increase in the internal pressure of the battery is located at a position in no contact with the covering film surface of an adjoining battery.Type: ApplicationFiled: October 11, 2013Publication date: February 6, 2014Inventors: Tomokazu KUMEUCHI, Takao DAIDOJI, Isao TOCHIHARA
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Patent number: 8617731Abstract: The invention provides a closed type battery comprising a battery element covered with a covering film and a heat fusion seal portion formed by heat fusion on a periphery of the covering film, wherein the cleaving strength upon an internal pressure rise of a seal portion positioned between a positive electrode terminal and a negative electrode terminal is larger than that of any other seal portion, and a safety valve adapted to release pressure upon a battery's internal pressure rise is located at a portion other than said inter-terminal seal portion. The invention also provides an assembled battery wherein a plurality of closed type batteries are stacked one upon another while a safety valve adapted to release pressure upon an increase in the internal pressure of the battery is located at a position in no contact with the covering film surface of an adjoining battery.Type: GrantFiled: February 14, 2007Date of Patent: December 31, 2013Assignee: NEC Energy Devices, Ltd.Inventors: Tomokazu Kumeuchi, Takao Daidoji, Isao Tochihara
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Patent number: 8586219Abstract: The invention provides a closed type battery comprising a battery element covered with a covering film and a heat fusion seal portion formed by heat fusion on a periphery of the covering film, wherein the cleaving strength upon an internal pressure rise of a seal portion positioned between a positive electrode terminal and a negative electrode terminal is larger than that of any other seal portion, and a safety valve adapted to release pressure upon a battery's internal pressure rise is located at a portion other than said inter-terminal seal portion. The invention also provides an assembled battery wherein a plurality of closed type batteries are stacked one upon another while a safety valve adapted to release pressure upon an increase in the internal pressure of the battery is located at a position in no contact with the covering film surface of an adjoining battery.Type: GrantFiled: February 14, 2007Date of Patent: November 19, 2013Assignee: NEC Energy Devices, Ltd.Inventors: Tomokazu Kumeuchi, Takao Daidoji, Isao Tochihara
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Patent number: 8491673Abstract: A method for production of a stacked battery having a step of determining in advance a simultaneously bondable number of electrode current collection tabs and a step of forming groups of current collection tabs, and a step of displacing the bonding positions of the groups of positive electrode current collection tabs or those of negative electrode current collection tabs relative to each other in the direction of drawing out the positive electrode current collection tabs or the negative electrode current collection tabs, or in the direction perpendicular to the direction and collectively bonding the positive electrode current collection tabs or the negative electrode current collection tabs, of each group under the bonding conditions.Type: GrantFiled: September 7, 2007Date of Patent: July 23, 2013Assignee: NEC Energy Devices, Ltd.Inventors: Takao Daidoji, Tomokazu Kumeuchi, Koichi Zama
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Publication number: 20130171497Abstract: The present invention relates to a stacked secondary battery that includes a laminated body, the laminated body including: a first electrode (10) in which a first electrode active material (12) is applied to both surfaces of a sheet-shaped collector (11), the first electrode having a first region (11a) to which the first electrode active material has been applied and a second region (11b) to which the first electrode active material has not been applied; a second electrode (20) in which a second electrode active material (22) different in polarity from the first electrode active material is applied to both surfaces (21) of a sheet-shaped collector; and a porous separator (30), the first and second electrodes being stacked via the porous separator, the first and second electrodes being stacked via the porous separator.Type: ApplicationFiled: September 9, 2011Publication date: July 4, 2013Applicant: NEC ENERGY DEVICES, LTD.Inventors: Shinsuke Enomoto, Tomokazu Kumeuchi
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Patent number: 8450007Abstract: A stacked secondary battery includes battery element including a multilayer structure formed by laying alternately flat plate-shaped positive electrodes and flat plate-shaped negative electrodes by way of separators, the number of the positive electrodes being larger by one than that of the negative electrodes or vice versa, and connecting positive electrode draw-out terminals of the positive electrodes to each other and also negative electrode draw-out terminals of the negative electrodes to each other, plate-shaped metal members respectively arranged on and held in contact with the opposite end surfaces of the multilayer structure as viewed in the stacking direction, binding members binding the plate-shaped metal members so as to pinch and hold the multilayer structure from the end surfaces thereof and a film casing containing the battery element pinched by and held between the plate-shaped metal members in a sealed condition.Type: GrantFiled: July 29, 2009Date of Patent: May 28, 2013Assignee: NEC Energy Devices, Ltd.Inventors: Shinsuke Enomoto, Tomokazu Kumeuchi
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Publication number: 20120227253Abstract: There is provided a lithium ion secondary battery exhibiting a high capacity retention rate over a long period.Type: ApplicationFiled: September 30, 2010Publication date: September 13, 2012Applicant: NEC ENERGY DEVICES, LTD.Inventors: Tomokazu Kumeuchi, Koichi Zama, Daisuke Kono
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Publication number: 20120177975Abstract: A stacked battery includes a square battery element in which a tabular positive electrode, a separator and a tabular negative electrode are laminated, wherein: one side of the battery element is a terminal connection section pulled-out surface, which is provided on both the positive and negative electrodes and where a plate-like positive-electrode terminal connection section and a plate-like negative-electrode terminal connection are both pulled out; projection surfaces, which are generated by vertically projecting the positive-electrode terminal connection section and the negative-electrode terminal connection section onto surfaces extending from the positive and negative electrodes, do not cross each other; a surface of the positive electrode and a surface of the negative electrode, which are facing each other, are different in area; each electrode is disposed so that an entire projection portion, which is generated by projecting the small-area electrode onto a surface of a large-area electrode that faces tType: ApplicationFiled: September 10, 2009Publication date: July 12, 2012Applicants: NEC CORPORATION, NEC ENERGY DEVICES, LTD.Inventors: Hiroshi Yageta, Tomokazu Kumeuchi, Takao Daidoji
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Patent number: 8049463Abstract: A stacked battery module or a battery pack is formed by laying a plurality of unit batteries of non-aqueous electrolyte batteries in layers with the surfaces thereof having a large area disposed vis-à-vis and electrically connecting them in series and a temperature fuse is arranged in the central part of the stacked battery module with one of its terminals connected to either the positive electrode terminal or the negative electrode terminal of the stacked battery module while the other terminal connected to a charging terminal for supplying a charging current in a charging operation. One of the terminals of the stacked battery module is connected to a discharging terminal for taking out a discharging current in a discharging operation and the other terminal of the stacked battery module is a common terminal for charging and discharging operations.Type: GrantFiled: November 27, 2006Date of Patent: November 1, 2011Assignee: NEC Energy Devices, Ltd.Inventors: Tomokazu Kumeuchi, Koichi Zama, Isao Tochihara, Izumi Tanaka
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Publication number: 20100062332Abstract: A lithium ion secondary battery shows excellent charge/discharge properties and also excellent storage properties. The lithium ion secondary battery includes an aprotic electrolyte containing a sulfonate ester having at least two sulfonyl groups and graphite as principal component of negative electrode active substance layers, the density of the negative electrode active substance layers being not less than 0.90 g/cm3 and not more than 1.65 g/cm3.Type: ApplicationFiled: September 8, 2009Publication date: March 11, 2010Applicant: NEC TOKIN CORPORATIONInventor: Tomokazu Kumeuchi
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Publication number: 20100028769Abstract: A stacked secondary battery includes battery element including a multilayer structure formed by laying alternately flat plate-shaped positive electrodes and flat plate-shaped negative electrodes by way of separators, the number of the positive electrodes being larger by one than that of the negative electrodes or vice versa, and connecting positive electrode draw-out terminals of the positive electrodes to each other and also negative electrode draw-out terminals of the negative electrodes to each other, plate-shaped metal members respectively arranged on and held in contact with the opposite end surfaces of the multilayer structure as viewed in the stacking direction, binding members binding the plate-shaped metal members so as to pinch and hold the multilayer structure from the end surfaces thereof and a film casing containing the battery element pinched by and held between the plate-shaped metal members in a sealed condition.Type: ApplicationFiled: July 29, 2009Publication date: February 4, 2010Applicant: NEC TOKIN CORPORATIONInventors: Shinsuke Enomoto, Tomokazu Kumeuchi
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Patent number: 7556889Abstract: A life of a secondary battery is extended, increase in a resistance when storing a secondary battery at an elevated temperature is prevented, and increase in a resistance during a charge-discharge cycle is prevented. A positive electrode active material comprising a lithium manganate and a lithium nickelate are used. The lithium manganate is a compound represented by the following formula (1) or the compound in which some of Mn or O sites are replaced with another element: Li1+xMn2?xO4??(1) (in the above-shown formula (1), 0.15?x?0.24).Type: GrantFiled: May 26, 2004Date of Patent: July 7, 2009Assignee: NEC CorporationInventors: Tomokazu Kumeuchi, Tatsuji Numata, Daisuke Kawasaki
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Publication number: 20080060189Abstract: A method for production of a stacked battery having a plurality of positive electrode current collection tabs and a plurality of negative electrode current collection tabs drawn out from a stacked member formed by laying positive electrodes and negative electrodes alternately one on the other with separators interposed between them and bonded respectively to a positive lead terminal and a negative lead terminal comprises a step of determining in advance a simultaneously bondable number, or the number of positive electrode current collection tabs and the number of negative electrode current collection tabs that can be laid one on the other and collectively bonded, and bonding conditions for bonding them and a step of forming groups of current collection tabs, each group being formed by laying a number of current collection tabs not exceeding the simultaneously bondable number one on the other, displacing the bonding positions of the groups of positive electrode current collection tabs or those of negative elecType: ApplicationFiled: September 7, 2007Publication date: March 13, 2008Applicant: NEC TOKIN CorporationInventors: Takao Daidoji, Tomokazu Kumeuchi, Koichi Zama
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Publication number: 20070190402Abstract: The invention provides a closed type battery comprising a battery element covered with a covering film and a heat fusion seal portion formed by heat fusion on a periphery of the covering film, wherein the cleaving strength upon an internal pressure rise of a seal portion positioned between a positive electrode terminal and a negative electrode terminal is larger than that of any other seal portion, and a safety valve adapted to release pressure upon a battery's internal pressure rise is located at a portion other than said inter-terminal seal portion. The invention also provides an assembled battery wherein a plurality of closed type batteries are stacked one upon another while a safety valve adapted to release pressure upon an increase in the internal pressure of the battery is located at a position in no contact with the covering film surface of an adjoining battery.Type: ApplicationFiled: February 14, 2007Publication date: August 16, 2007Applicant: NEC TOKIN CORPORATIONInventors: Tomokazu KUMEUCHI, Takao DAIDOJI, Isao TOCHIHARA
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Publication number: 20070120526Abstract: A stacked battery module or a battery pack is formed by laying a plurality of unit batteries of non-aqueous electrolyte batteries in layers with the surfaces thereof having a large area disposed vis-à-vis and electrically connecting them in series and a temperature fuse is arranged in the central part of the stacked battery module with one of its terminals connected to either the positive electrode terminal or the negative electrode terminal of the stacked battery module while the other terminal connected to a charging terminal for supplying a charging current in a charging operation. One of the terminals of the stacked battery module is connected to a discharging terminal for taking out a discharging current in a discharging operation and the other terminal of the stacked battery module is a common terminal for charging and discharging operations.Type: ApplicationFiled: November 27, 2006Publication date: May 31, 2007Applicant: NEC TOKIN CORPORATIONInventors: Tomokazu Kumeuchi, Koichi Zama, Isao Tochihara, Izumi Tanaka
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Publication number: 20060035151Abstract: A life of a secondary battery is extended, increase in a resistance when storing a secondary battery at an elevated temperature is prevented, and increase in a resistance during a charge-discharge cycle is prevented. A positive electrode active material comprising a lithium manganate and a lithium nickelate are used. The lithium manganate is a compound represented by the following formula (1) or the compound in which some of Mn or O sites are replaced with another element: Li1+xMn2?xO4??(1) (in the above-shown formula (1), 0.15?x?0.24).Type: ApplicationFiled: May 26, 2004Publication date: February 16, 2006Inventors: Tomokazu Kumeuchi, Tatsuji Numata, Daisuke Kawasaki
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Publication number: 20040072071Abstract: A non-aqueous-electrolyte based secondary battery includes a mixture of lithium manganate and lithium nickelate as a cathode active material, and includes at least one element selected from Bi, Pb, Sb and Sn.Type: ApplicationFiled: August 27, 2003Publication date: April 15, 2004Inventors: Mikio Watanabe, Tatsuji Numata, Tomokazu Kumeuchi
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Patent number: 6558438Abstract: In a film packed battery, a battery power source comprising, at least, a cathode, an anode, an electrolyte, and a separator is packed with a film. In a method for producing film packed battery, a pre-charging step for charging the film packed battery while pressure is applied, for example, by sandwiching it between two flat plates is included at least once.Type: GrantFiled: July 21, 2000Date of Patent: May 6, 2003Assignees: NEC Corporation, NEC Tokin Tochigi, Ltd.Inventors: Masaharu Satoh, Norihide Ohyama, Masato Shirakata, Tomokazu Kumeuchi, Hiroshi Yageta, Ryuichi Shimizu, Yutaka Bannai