Patents by Inventor Kouhei Tsuzuki
Kouhei Tsuzuki 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: 11909033Abstract: In a nonaqueous electrolyte secondary battery, a negative electrode mix layer includes a first layer and a second layer disposed successively from a negative electrode collector. The first layer contains a first carbon-based active material having a 10% compressive strength of 3 MPa or less and a silicon-based active material containing Si. The second layer contains a second carbon-based active material having a 10% compressive strength of 5 MPa or more and has a lower content (mass ratio) of the silicon-based active material than the first layer.Type: GrantFiled: January 22, 2019Date of Patent: February 20, 2024Assignees: PANASONIC HOLDINGS CORPORATION, PANASONIC ENERGY CO., LTD.Inventors: Kouhei Tsuzuki, Yuki Morikawa, Hirokazu Wada, Yuta Matsuo, Kaori Ishikawa, Katsunori Yanagida
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Publication number: 20230387410Abstract: The herein disclosed negative electrode is a negative electrode for a nonaqueous electrolyte secondary battery that includes a current collector, and a negative electrode active material layer disposed on a single surface or both surfaces of the current collector. The negative electrode active material layer includes a negative electrode active material and a binder. A graphite particle and a Si-containing particle are included as the negative electrode active material. A carboxymethyl cellulose (CMC), a poly acrylic acid (PAA), and a styrene butadiene rubber (SBR) are included as the binder. A spring constant in a thickness direction of the negative electrode is equal to or more than 70 kN/mm and not more than 400 kN/mm, and a yield loop height on a stiffness test is equal to or less than 13 mm.Type: ApplicationFiled: May 16, 2023Publication date: November 30, 2023Inventors: Yurika KOJIMA, Yuki MORIKAWA, Naoto ONODERA, Kouhei TSUZUKI, Hideki SANO
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Publication number: 20230387387Abstract: A method of producing a negative electrode composite material slurry for a non-aqueous electrolyte secondary battery comprises a first step to obtain a first mixed-kneaded body, and a second step to use the first mixed-kneaded body to obtain the negative electrode composite material slurry. The first step includes a step to mix and knead a negative electrode active material including a carbon-based active material and a Si-based active material, carboxymethylcellulose, polyacrylic acid, and water. The second step includes a step (x1) to mix and knead the first mixed-kneaded body, carboxymethylcellulose, and water. A solid content of the first mixed-kneaded body is from (a-3)% to a%, and a solid content of the negative electrode composite material slurry is from (a-15)% to (a-10)%. “a” refers to the solid content [%] defined in the specification.Type: ApplicationFiled: May 19, 2023Publication date: November 30, 2023Inventors: Hideki SANO, Kouhei TSUZUKI, Naoto ONODERA, Yuki MORIKAWA, Yurika KOJIMA
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Publication number: 20230387386Abstract: The herein disclosed negative electrode is a negative electrode for a nonaqueous electrolyte secondary battery that includes a current collector, and a negative electrode active material layer disposed on the current collector. The negative electrode active material layer includes a negative electrode active material and a binder, and a graphite particle and a Si-containing particle are included as the negative electrode active material. An average 10% yield strength of the graphite particle is equal to or less than 12 MPa. A BET specific surface area of the graphite particle is equal to or more than 0.5 m2/g and not more than 3.5 m2/g. A spring constant in a thickness direction of the negative electrode is equal to or less than 200 kN/mm. A 90° peel strength between the current collector and the negative electrode active material layer is equal to or more than 1.5 N/m.Type: ApplicationFiled: May 16, 2023Publication date: November 30, 2023Inventors: Yuki MORIKAWA, Yurika KOJIMA, Naoto ONODERA, Kouhei TSUZUKI, Hideki SANO
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Patent number: 11817577Abstract: The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The nonaqueous electrolyte secondary battery includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode collector containing Ti as a main component and having a thickness of 1 ?m to 8 ?m. The negative electrode includes a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains negative electrode active material particles containing first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains negative electrode active material particles containing second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.Type: GrantFiled: March 12, 2021Date of Patent: November 14, 2023Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yasunori Baba, Harunari Shimamura, Keisuke Ohara, Kohei Masai, Kouhei Tsuzuki, Katsunori Yanagida, Yo Kato
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Patent number: 11811050Abstract: A secondary battery module includes a nonaqueous-electrolyte secondary battery and an elastic body, wherein a negative electrode constituting the nonaqueous-electrolyte secondary battery includes a negative-electrode active material layer, the negative-electrode active material layer includes a first layer, and a second layer that is formed on the first layer and has a higher compression modulus than the first layer, a separator constituting the nonaqueous-electrolyte secondary battery has a lower compression modulus than the first layer, the elastic body has a lower compression modulus than the separator, the graphite particles contained in the first layer have a BET specific surface area of 1 to 2.5 m2/g, and the content of Si particles in the first layer is 6 mass % to 13 mass % relative to the total amount of the negative-electrode active material layer.Type: GrantFiled: February 11, 2021Date of Patent: November 7, 2023Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kaoru Inoue, Akihiro Taniguchi, Hideki Sano, Kouhei Tsuzuki, Hiroki Iguchi
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Patent number: 11791471Abstract: A secondary battery module according to the present embodiment includes a nonaqueous-electrolyte secondary battery and an elastic body, wherein a negative electrode constituting the nonaqueous-electrolyte secondary battery includes a negative-electrode current collector and a negative-electrode active material layer, the negative-electrode active material layer includes a first layer formed on the negative-electrode current collector, and a second layer that is formed on the first layer and has a higher compression modulus than the first layer, a separator constituting the nonaqueous-electrolyte secondary battery has a lower compression modulus than the first layer, the elastic body has a lower compression modulus than the separator, a graphite particles contained in the first layer have a BET specific surface area of 1 to 2.5 m2/g, and the first layer 52a contains 0.01 mass % to 0.4 mass % of a carbon nanotube having one to five graphene sheets.Type: GrantFiled: February 9, 2021Date of Patent: October 17, 2023Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kaoru Inoue, Akihiro Taniguchi, Hideki Sano, Kouhei Tsuzuki, Hiroki Iguchi
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Publication number: 20230327110Abstract: A non-aqueous electrolyte secondary battery includes a negative electrode active material layer including a negative electrode active material. The negative electrode active material includes first graphite particles, second graphite particles each having a compressive elastic modulus more than a compressive elastic modulus of each of the first graphite particles, and Si-containing particles. A contact length Lt1 between a first graphite particle and a Si-containing particle is equal to or more than a contact length Lt2 between a second graphite particle and the Si-containing particle.Type: ApplicationFiled: April 7, 2023Publication date: October 12, 2023Inventors: Naoto ONODERA, Hideki SANO, Kouhei TSUZUKI, Yuki MORIKAWA, Yurika KOJIMA
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Publication number: 20230327081Abstract: The present disclosure relates to a negative electrode for a non-aqueous electrolyte secondary battery, wherein each of first silicon-containing particles and second silicon-containing particles contains a carbon domain and a silicon domain dispersed in the carbon domain and having a nano size, each of a first binder and a second binder contains carboxymethyl cellulose (CMC), and a content ratio of the carboxymethyl cellulose in a second active material layer is more than a content ratio of the carboxymethyl cellulose in a first active material layer.Type: ApplicationFiled: April 6, 2023Publication date: October 12, 2023Inventors: Kouhei TSUZUKI, Naoto ONODERA, Hideki SANO, Yuki MORIKAWA, Yurika KOJIMA
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Publication number: 20230327080Abstract: The present disclosure relates to a negative electrode for a non-aqueous electrolyte secondary battery, the negative electrode comprising an active material layer, wherein the active material layer contains graphite particles, fibrous carbon, silicon-containing particles, and a binder, a BET specific surface area of the graphite particles is 3.5 m2/g or less, the fibrous carbon includes a carbon nanotube, each of the silicon-containing particles includes a domain composed of carbon and a domain composed of silicon and having a size of 50 nm or less, and an oxygen content ratio in each of the silicon-containing particles is 7 wt % or less. According to the present disclosure, a negative electrode and a non-aqueous electrolyte secondary battery are provided to suppress decrease in initial capacity and cycling performance.Type: ApplicationFiled: March 24, 2023Publication date: October 12, 2023Applicant: PRIME PLANET ENERGY & SOLUTIONS, INC.Inventors: Kouhei TSUZUKI, Naoto ONODERA, Hideki SANO, Yuki MORIKAWA, Yurika KOJIMA
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Patent number: 11742548Abstract: An advantage of the present invention is to suppress an increase in resistance during high-rate charge and discharge and a reduction in capacity during a charge and discharge cycle. An electrical storage module of the present embodiment includes: an electrical storage device, and an elastic body that is placed with the electrical storage device and receives a load from the electrical storage device in a placement direction. The electrical storage device includes a positive electrode, a negative electrode, and a separator. The negative electrode includes a negative-electrode active material layer. The negative-electrode active material layer includes a first layer formed on the negative-electrode current collector, and a second layer that is formed on the first layer and has a higher compression modulus than the first layer. The separator has a lower compression modulus than the first layer, and the elastic body has a lower compression modulus than the separator.Type: GrantFiled: January 12, 2021Date of Patent: August 29, 2023Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kouhei Tsuzuki, Tetsuji Omura, Goro Fujita, Katsunori Yanagida, Yoshitaka Minamida
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Publication number: 20230104739Abstract: A secondary cell module according to the present invention has: at least one nonaqueous electrolyte secondary cell; and an elastic body that is arranged together with the nonaqueous electrolyte secondary cell and that receives a load from the nonaqueous electrolyte secondary cell in the direction of arrangement. The nonaqueous electrolyte secondary cell comprises: an electrode body in which a positive pole, a negative pole, and a separator disposed between the positive pole and the negative pole are laminated; and a housing which contains the electrode body, wherein the modulus of elastic compression of the elastic body is 5 MPa to 120 MPa, the positive pole has a positive pole collector containing Al and an element other than Al, and the thermal conductivity of the positive pole collector is 65 W/(m·K) to 150 W/(m·K).Type: ApplicationFiled: January 18, 2021Publication date: April 6, 2023Applicant: Panasonic Holdings CorporationInventors: Takuya Asari, Harunari Shimamura, Kouhei Tsuzuki, Katsunori Yanagida
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Publication number: 20230061490Abstract: This secondary cell module comprises anon-aqueous electrolyte secondary cell with: an electrode body in which a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode are layered; and a housing that accommodates the electrode body. The compression modulus of elasticity of the elastic body is in the range 5-120 MPa, and the positive electrode is provided with: a positive electrode current collector that contains titanium as a principal constituent and has a thickness of 1-8 ?m; and a positive electrode active material layer that is disposed on the positive electrode current collector and that includes a complex oxide containing lithium nickel, the proportion of nickel to the total quantity of metal elements other than lithium being in the range 70-100 mol %.Type: ApplicationFiled: January 18, 2021Publication date: March 2, 2023Applicant: PANASONIC HOLDINGS CORPORATIONInventors: Yasunori Baba, Kouhei Tsuzuki, Harunari Shimamura, Keisuke Ohara, Katsunori Yanagida
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Patent number: 11557787Abstract: The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The positive electrode includes a positive electrode collector with a thermal conductive rate of 65 W/(m·K) to 150 W/(m·K). The negative electrode includes a negative electrode active material layer including a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.Type: GrantFiled: March 12, 2021Date of Patent: January 17, 2023Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuki Morikawa, Takuya Asari, Harunari Shimamura, Kouhei Tsuzuki, Katsunori Yanagida, Yo Kato
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Publication number: 20220271386Abstract: A battery module includes a pair of secondary batteries disposed adjacent to each other and a spacer disposed between the secondary batteries. Each of the secondary batteries includes a plurality of electrodes each of which has a rectangular shape and is disposed to face each other, a case configured to house the electrodes, the case having a rectangular parallelepiped shape, and an electrolyte in the case. The spacer is made of an elastic body. An aspect ratio of each of the electrodes is 10 or less, and a spring constant of the spacer is 0.03 MPa/mm or more and 5.4 MPa/mm or less.Type: ApplicationFiled: January 11, 2022Publication date: August 25, 2022Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, PRIME PLANET ENERGY & SOLUTIONS, INC.Inventors: Hiroki NAGAI, Takaaki MATSUI, Takafumi NOSE, Koichiro ISOBE, Koji FUJINAGA, Kouhei TSUZUKI
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Publication number: 20220216474Abstract: This negative electrode for non-aqueous electrolyte secondary batteries comprises a negative electrode core and a negative electrode mixture layer provided on the surface of the negative electrode core and including a negative electrode active substance. The negative electrode mixture layer has: a first layer including substantially only graphite having a BET specific surface area of 0.5-2.5 m2/g, as a negative electrode active substance; and a second layer including substantially only at least either an element that alloys with lithium or a compound containing said element, as a negative electrode active substance.Type: ApplicationFiled: April 8, 2020Publication date: July 7, 2022Applicant: Panasonic CorporationInventors: Yuji Yokoyama, Kouhei Tsuzuki, Kohei Masai
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Publication number: 20220052312Abstract: A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and a styrene-butadiene rubber, and the glass transition temperature (Tg) of the styrene-butadiene rubber in an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector is higher than that of the styrene-butadiene rubber in an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer.Type: ApplicationFiled: October 31, 2019Publication date: February 17, 2022Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Kouhei Tsuzuki, Akihiko Takada, Yuki Morikawa, Hirokazu Wada, Katsunori Yanagida
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Publication number: 20220037640Abstract: A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and carboxymethyl cellulose, wherein the molecular weight of the carboxymethyl cellulose in an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer is smaller than that of the carboxymethyl cellulose in an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector.Type: ApplicationFiled: November 11, 2019Publication date: February 3, 2022Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Kouhei Tsuzuki, Yuki Morikawa, Hirokazu Wada, Katsunori Yanagida
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Publication number: 20220029165Abstract: A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and polyvinylpyrrolidone, and an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector has a higher polyvinylpyrrolidone content than an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer.Type: ApplicationFiled: November 11, 2019Publication date: January 27, 2022Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Kouhei Tsuzuki, Yuki Morikawa, Hirokazu Wada, Katsunori Yanagida
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Publication number: 20210296683Abstract: The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The positive electrode includes a positive electrode collector with a thermal conductive rate of 65 W/(m·K) to 150 W/(m·K). The negative electrode includes a negative electrode active material layer including a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.Type: ApplicationFiled: March 12, 2021Publication date: September 23, 2021Applicants: Panasonic Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yuki Morikawa, Takuya Asari, Harunari Shimamura, Kouhei Tsuzuki, Katsunori Yanagida, Yo Kato