Patents by Inventor Hidefumi HASEGAWA
Hidefumi HASEGAWA 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: 10505229Abstract: The energy storage device of the present invention includes: a negative electrode including a negative composite layer and a composite layer non-forming portion on both surfaces of a negative electrode current collecting foil respectively; a positive electrode including a positive composite layer on both surfaces of a positive electrode current collecting foil respectively; and a separator including an insulation layer which faces the positive electrode and is interposed between the negative electrode and the positive electrode. The negative electrode, the separator and the positive electrode are stacked in a first direction. The negative composite layer and the composite layer non-forming portion are disposed adjacently to each other in a second direction orthogonal to the first direction on the respective surfaces of the negative electrode. The separator is configured to project in the second direction from the positive composite layer at one end of the separator in the second direction.Type: GrantFiled: February 16, 2016Date of Patent: December 10, 2019Assignee: GS Yuasa International Ltd.Inventors: Hidefumi Hasegawa, Kie Tanaka
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Publication number: 20180034098Abstract: The energy storage device of the present invention includes: a negative electrode including a negative composite layer and a composite layer non-form ing portion on both surfaces of a negative electrode current collecting foil respectively; a positive electrode including a positive composite layer on both surfaces of a positive electrode current collecting foil respectively; and a separator including an insulation layer which faces the positive electrode and is interposed between the negative electrode and the positive electrode. The negative electrode, the separator and the positive electrode are stacked in a first direction. The negative composite layer and the composite layer non-forming portion are disposed adjacently to each other in a second direction orthogonal to the first direction on the respective surfaces of the negative electrode. The separator is configured to project in the second direction from the positive composite layer at one end of the separator in the second direction.Type: ApplicationFiled: February 16, 2016Publication date: February 1, 2018Inventors: Hidefumi HASEGAWA, Kie TANAKA
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Publication number: 20170229711Abstract: A purpose of the present invention is to provide a technique for still further improving safety by increasing the resistance change ratio in a high-temperature range in a nonaqueous electrolyte energy storage device, the internal resistance of which increases with an increase in internal temperature. In a positive electrode plate for nonaqueous electrolyte energy storage device, an intermediate layer containing an electrically conducting agent and a binder is provided between a positive electrode current collector and a positive composite layer, and as the binder in the intermediate layer, one having a mass average molecular weight larger than that of a binder in the positive composite layer is used. Consequently, the resistance change ratio in a high-temperature range can be increased.Type: ApplicationFiled: August 6, 2015Publication date: August 10, 2017Inventors: Yuto YAMAKAWA, Hidefumi HASEGAWA, Yohei SHIBATA, Shinya UEMATSU
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Publication number: 20170214037Abstract: In order to improve the insulating property of a covering layer containing a filler disposed on at least a part of a surface of a negative composite layer, there is provided a negative electrode for a nonaqueous electrolyte energy storage device, including a negative electrode including a current collector, a negative composite layer containing a negative active material, and a covering layer containing a filler on at least a part of a surface of the negative composite layer, wherein in X-ray diffraction (XRD) measurement of the negative electrode, a peak intensity ratio (I(002)/I(100)) between a diffraction peak attributed to (002) plane of the negative active material and a diffraction peak attributed to (100) plane of the negative active material is 219 or more and 862 or less.Type: ApplicationFiled: September 30, 2015Publication date: July 27, 2017Applicant: GS Yuasa International Ltd.Inventors: Shinya UEMATSU, Tomoya TSUCHIKAWA, Hidefumi HASEGAWA
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Patent number: 9509148Abstract: Provided is an electric storage device including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein an inorganic filler layer is disposed between the positive electrode and the negative electrode and the nonaqueous electrolyte solution contains lithium difluorobis(oxalato)phosphate.Type: GrantFiled: October 23, 2013Date of Patent: November 29, 2016Assignee: GS Yuasa International Ltd.Inventors: Tomonori Kako, Hidefumi Hasegawa, Katsushi Nishie, Sumio Mori
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Patent number: 9263773Abstract: A technology described herein is for accurately determining the SOC of a secondary battery. An open-circuit-voltage-to-state-of-charge (OCV-SOC) characteristic has a capacity decrease estimation OCV region in which a relationship between the OCV and the SOC is assumed not to change due to degradation of the secondary battery 1a since a reference time point. Charge currents or discharge currents in the capacity decrease estimation OCV region are accumulated in a process in which the secondary battery SOC changes among OCVs. From the accumulation, an accumulated current is obtained. A secondary battery capacity decrease is estimated based on the accumulated current. An OCV-SOC characteristic is specified based on the estimated secondary battery capacity decrease and a predetermined relationship between the battery capacity decrease of the secondary battery since the reference time point and the OCV-SOC characteristic.Type: GrantFiled: January 18, 2011Date of Patent: February 16, 2016Assignee: GS YUASA INTERNATIONAL LTD.Inventors: Masashi Nakamura, Hidefumi Hasegawa
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Patent number: 9041405Abstract: A condition estimation device includes a voltage measurement circuit, memory, and a controller. The voltage measurement circuit measures an open circuit voltage (OCV) of an electric storage device. The memory is configured to store first information on a correlation between a positive electrode potential and an electric storage capacity and second information on a correlation between a negative electrode potential and an electric storage capacity. The controller is configured to: measure an OCV under charge or discharge; calculate an electric storage capacity of the electric storage device having the OCV equal to a reference voltage; correct at least one of the first information and the second information such that a potential difference at the calculated capacity is equal to the reference voltage; and generate an OCV characteristic based on the first and the second information after the at least one of the first and the second information is corrected.Type: GrantFiled: September 11, 2013Date of Patent: May 26, 2015Assignee: GS Yuasa International Ltd.Inventors: Kenichi Sejima, Yoshihiko Mizuta, Masashi Nakamura, Hiroshi Sekiguchi, Hidefumi Hasegawa, Shinya Kitano
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Publication number: 20140176074Abstract: Provided is an electric storage device including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein an inorganic filler layer is disposed between the positive electrode and the negative electrode and the nonaqueous electrolyte solution contains lithium difluorobis(oxalato)phosphate.Type: ApplicationFiled: October 23, 2013Publication date: June 26, 2014Applicant: GS Yuasa International Ltd.Inventors: Tomonori KAKO, Hidefumi HASEGAWA, Katsushi NISHIE, Sumio MORI
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Publication number: 20140141335Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode containing a first positive active material having an average particle size of 12 ?m or more and 30 ?m or less, which is represented by a general formula LiaMn2-bAbO4 and a second positive active material having an average particle size of 0.5 ?m or more and 7?m or less, which is represented by a general formula LidNixCoyMnzMaO2; and a negative electrode containing 50 mass % or more of a negative active material having an average particle size of 3 ?m or more and 18 ?m or less, and the mass mixing ratio between the first positive active material and the second positive active material meets the mass of the first positive active material: the mass of the second positive active material=20:80 to 80:20.Type: ApplicationFiled: July 12, 2012Publication date: May 22, 2014Applicant: GGS Yuasa International Ltd.Inventors: Tomoya Tsuchikawa, Shinya Kitano, Hidefumi Hasegawa, Keisuke Anami, Yasushi Uebo
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Publication number: 20140084939Abstract: A condition estimation device includes a voltage measurement circuit, memory, and a controller. The voltage measurement circuit measures an open circuit voltage (OCV) of an electric storage device. The memory is configured to store first information on a correlation between a positive electrode potential and an electric storage capacity and second information on a correlation between a negative electrode potential and an electric storage capacity. The controller is configured to: measure an OCV under charge or discharge; calculate an electric storage capacity of the electric storage device having the OCV equal to a reference voltage; correct at least one of the first information and the second information such that a potential difference at the calculated capacity is equal to the reference voltage; and generate an OCV characteristic based on the first and the second information after the at least one of the first and the second information is corrected.Type: ApplicationFiled: September 11, 2013Publication date: March 27, 2014Applicant: GS Yuasa International Ltd.Inventors: Kenichi SEJIMA, Yoshihiko Mizuta, Masashi Nakamura, Hiroshi Sekiguchi, Hidefumi Hasegawa, Shinya Kitano
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Patent number: 8597827Abstract: Provided is an electric storage device including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein an inorganic filler layer is disposed between the positive electrode and the negative electrode and the nonaqueous electrolyte solution contains lithium difluorobis(oxalato)phosphate.Type: GrantFiled: May 10, 2012Date of Patent: December 3, 2013Assignee: G.S. Yuasa International Ltd.Inventors: Tomonori Kako, Hidefumi Hasegawa, Katsushi Nishie, Sumio Mori
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Publication number: 20120293131Abstract: A technology described herein is for accurately determining the SOC of a secondary battery. An open-circuit-voltage-to-state-of-charge (OCV-SOC) characteristic has a capacity decrease estimation OCV region in which a relationship between the OCV and the SOC is assumed not to change due to degradation of the secondary battery 1a since a reference time point. Charge currents or discharge currents in the capacity decrease estimation OCV region are accumulated in a process in which the secondary battery SOC changes among OCVs. From the accumulation, an accumulated current is obtained. A secondary battery capacity decrease is estimated based on the accumulated current. An OCV-SOC characteristic is specified based on the estimated secondary battery capacity decrease and a predetermined relationship between the battery capacity decrease of the secondary battery since the reference time point and the OCV-SOC characteristic.Type: ApplicationFiled: January 18, 2011Publication date: November 22, 2012Inventors: Masashi Nakamura, Hidefumi Hasegawa
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Publication number: 20120288751Abstract: Provided is an electric storage device including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein an inorganic filler layer is disposed between the positive electrode and the negative electrode and the nonaqueous electrolyte solution contains lithium difluorobis(oxalato)phosphate.Type: ApplicationFiled: May 10, 2012Publication date: November 15, 2012Applicant: GS YUASA INTERNATIONAL LTD.Inventors: Tomonori KAKO, Hidefumi HASEGAWA, Katsushi NISHIE, Sumio MORI