Patents by Inventor Toyoki Fujihara
Toyoki Fujihara 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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Publication number: 20220115698Abstract: A non-aqueous electrolyte secondary battery including a positive electrode core; a positive electrode plate having a positive electrode active material layer formed on the positive electrode core; a negative electrode plate; a flat wound electrode assembly in which the positive electrode plate and the negative electrode plate are wound with a separator therebetween; and a non-aqueous electrolyte, wherein the positive electrode active material is a manganese-containing lithium transition metal composite oxide, the BET specific surface area of the positive electrode active material is 2.0-3.0 m2/g, the total surface area of the positive electrode active material contained in the positive electrode active material layer is 70-90 m2, and the value of A/B is 0.03-0.09 (?mol/m2), where A (?mol) is the total amount of FSO3 contained in the non-aqueous electrolyte, and B (m2) is the total area of the positive electrode active material contained in the positive electrode active material layer.Type: ApplicationFiled: December 19, 2019Publication date: April 14, 2022Applicant: SANYO Electric Co., Ltd.Inventors: Yohei Tao, Ken Kaneko, Keisuke Minami, Toyoki Fujihara
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Publication number: 20220077503Abstract: A non-aqueous electrolyte secondary battery comprises: a positive electrode core; a positive electrode plate having a positive electrode active material layer which is formed on the positive electrode core and contains a positive electrode active material; a negative electrode core; a negative electrode plate having a negative electrode active material layer which is formed on the negative electrode core and contains a negative electrode active material; a separator disposed between the positive and negative electrode plates; and a non-aqueous electrolytic solution, wherein the non-aqueous electrolytic solution contains lithium bis(oxalate) borate, and the value of A/B is 2-11, where A (?mol) is the total amount of lithium bis(oxalate) borate contained in the non-aqueous electrolytic solution, and B(m2) is the total area of the negative electrode active material contained in the region of the negative electrode active material layer facing the positive electrode active material layer with the separator therebType: ApplicationFiled: December 19, 2019Publication date: March 10, 2022Applicant: SANYO Electric Co., Ltd.Inventors: Yohei Tao, Masao Inoue, Keisuke Minami, Toyoki Fujihara
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Publication number: 20220077499Abstract: Provided is a non-aqueous electrolyte secondary battery having excellent properties even at low temperatures. The non-aqueous electrolyte secondary battery comprises: an electrode assembly including a positive electrode plate and a negative electrode plate; a non-aqueous electrolyte; an exterior body having an opening, and accommodating the electrode assembly and the non-aqueous electrolyte; and a sealing plate for sealing the opening of the exterior body, wherein the negative electrode plate has a negative electrode core and a negative electrode active material layer formed on the negative electrode core, and the non-aqueous electrolyte contains a non-aqueous solvent, the non-aqueous solvent containing 50-80 vol % of a chain carbonate with respect to the non-aqueous solvent, and containing, as the chain carbonate, 30-40 vol % of dimethyl carbonate, 3-8 vol % of propylene carbonate, and 2-5 vol % of methyl propionate with respect to the non-aqueous solvent.Type: ApplicationFiled: December 19, 2019Publication date: March 10, 2022Applicant: SANYO Electric Co., Ltd.Inventors: Yohei Tao, Mio Nosaka, Keisuke Minami, Toyoki Fujihara
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Publication number: 20220052313Abstract: In a cross section parallel to a thickness direction of a negative electrode active material layer, an average tortuosity ratio is 1.5 to 2.5. The average tortuosity ratio is calculated by the following formula: “R=B/A”. In the formula, “R” represents the average tortuosity ratio. “B” represents an average value of lengths of shortest routes each extending from a contact point between a negative electrode substrate and a negative electrode active material particle to a surface of the negative electrode active material layer along contour lines of a plurality of negative electrode active material particles. “A” represents an average value of a thicknesses of the negative electrode active material layer.Type: ApplicationFiled: July 27, 2021Publication date: February 17, 2022Inventors: Takeshi YOSHIDA, Hirofusa TANAKA, Yuji OGISHIMA, Keisuke MINAMI, Toyoki FUJIHARA
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Patent number: 10985400Abstract: A method for manufacturing a nonaqueous electrolyte secondary battery which includes an electrode assembly, a housing with an opening and contains the electrode assembly, and a sealing member sealing the opening, the electrode assembly comprising a positive electrode and a negative electrode. The positive electrode includes a positive electrode active material, lithium carbonate, and lithium phosphate, the negative electrode comprising a negative electrode active material. The method includes placing the electrode assembly in the housing, and placing a nonaqueous electrolyte containing lithium fluorosulfonate in the housing.Type: GrantFiled: March 6, 2019Date of Patent: April 20, 2021Assignee: SANYO Electric Co., Ltd.Inventors: Keisuke Minami, Yukari Kuratomi, Masao Inoue, Toyoki Fujihara, Naoya Nakanishi
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Patent number: 10892467Abstract: A nonaqueous electrolyte secondary battery includes an electrode assembly including a negative plate and a positive plate including a positive electrode active material mix layer, a nonaqueous electrolyte, a battery case that houses the electrode assembly and the nonaqueous electrolyte, and a pressure-sensitive safety system that operates when the pressure in the battery case reaches a value greater than or equal to a predetermined value. The positive electrode active material mix layer contains lithium carbonate and lithium phosphate. The average particle size of lithium carbonate contained in the positive electrode active material mix layer is greater than the average particle size of lithium phosphate contained in the positive electrode active material mix layer. The number of particles of lithium carbonate contained in the positive electrode active material mix layer is less than the number of particles of lithium phosphate contained in the positive electrode active material mix layer.Type: GrantFiled: June 29, 2018Date of Patent: January 12, 2021Assignee: SANYO Electric Co., Ltd.Inventors: Yuu Takanashi, Masao Inoue, Toyoki Fujihara
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Patent number: 10593922Abstract: A battery pack includes a plurality of prismatic secondary batteries with spacers each interposed therebetween. The prismatic secondary batteries each include a flat wound electrode body that is formed by winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween; a prismatic outer body that houses the wound electrode body; and a sealing plate that seals an opening of the flat wound electrode body. The wound electrode body has a wound positive electrode core-exposed portion at one end portion and a wound negative electrode core-exposed portion at the other end portion. A positive electrode current collector is joined to the positive electrode core-exposed portion to form a positive electrode-joined portion, and a negative electrode current collector is joined to the negative electrode core-exposed portion to form a negative electrode-joined portion.Type: GrantFiled: December 21, 2017Date of Patent: March 17, 2020Assignee: SANYO Electric Co., Ltd.Inventors: Tetsuya Okado, Keisuke Minami, Masashi Muraoka, Tomoharu Arai, Toyoki Fujihara
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Patent number: 10511007Abstract: A nonaqueous electrolyte secondary battery including a positive electrode collector electrically connected to a positive electrode plate, a negative electrode collector electrically connected to a negative electrode plate. At least one of the collectors includes a first-side base portion disposed near the sealing plate, and a first-side lead portion connected to one end portion of the first-side base portion and extending towards an electrode body. The first-side lead portion includes a first-side power generating element joining portion joined to a lateral side of the electrode body, and a first-side inclined portion inclined with respect to a thickness direction of the electrode body from the first-side power generating element joining portion towards an outer side in the thickness direction. A total weight of the electrode body and nonaqueous electrolyte contained in the electrode body ranges from 200 g or more to 500 g or less.Type: GrantFiled: August 23, 2017Date of Patent: December 17, 2019Assignee: SANYO Electric Co., Ltd.Inventors: Masashi Muraoka, Tomoharu Arai, Tetsuya Okado, Shingo Tode, Toyoki Fujihara
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Patent number: 10431827Abstract: A non-aqueous electrolyte secondary battery includes a pressure-sensitive current shut-off mechanism, wherein a positive electrode core body exposed portion is disposed at one end portion of a flat rolled electrode assembly, a negative electrode core body exposed portion is disposed at the other end portion, lithium carbonate is contained in a positive electrode mix layer, and a protective layer is disposed along the border with the positive electrode mix layer at the position opposite to a separator on the positive electrode core body exposed portion.Type: GrantFiled: August 14, 2018Date of Patent: October 1, 2019Assignee: SANYO ELECTRIC CO., LTD.Inventors: Shingo Tode, Toyoki Fujihara, Toshiyuki Nohma
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Publication number: 20190288290Abstract: A non-aqueous electrolyte secondary battery of one example according to an embodiment has an output of 1,000 W or more. An electrode body includes a protective layer which contains an insulating inorganic compound and which is provided on at least one surface of a positive electrode, a negative electrode, and a separator, and has a heat capacity per unit battery capacity of 16 J/K·Ah or more. The positive electrode has a surface resistance of 0.5 to 40?.Type: ApplicationFiled: January 23, 2019Publication date: September 19, 2019Applicant: SANYO Electric Co., Ltd.Inventors: Keisuke Minami, Kazuki Takeno, Toyoki Fujihara, Takuya Tamagawa
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Publication number: 20190198915Abstract: A method for manufacturing a nonaqueous electrolyte secondary battery which includes an electrode assembly, a housing with an opening and contains the electrode assembly, and a sealing member sealing the opening, the electrode assembly comprising a positive electrode and a negative electrode. The positive electrode includes a positive electrode active material, lithium carbonate, and lithium phosphate, the negative electrode comprising a negative electrode active material. The method includes placing the electrode assembly in the housing, and placing a nonaqueous electrolyte containing lithium fluorosulfonate in the housing.Type: ApplicationFiled: March 6, 2019Publication date: June 27, 2019Applicant: SANYO Electric Co., Ltd.Inventors: Keisuke Minami, Yukari Kuratomi, Masao Inoue, Toyoki Fujihara, Naoya Nakanishi
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Patent number: 10276890Abstract: A nonaqueous electrolyte secondary battery includes a prismatic housing having an opening and a sealing member sealing the opening. The prismatic housing contains a flat-wound electrode assembly and a nonaqueous electrolyte. The flat-wound electrode assembly includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode substrate and a positive electrode active material mixture layer formed on the positive electrode substrate. The positive electrode active material mixture layer contains lithium carbonate and lithium phosphate. The nonaqueous electrolyte contains lithium fluorosulfonate.Type: GrantFiled: June 22, 2016Date of Patent: April 30, 2019Assignee: SANYO Electric Co., Ltd.Inventors: Keisuke Minami, Yukari Kuratomi, Masao Inoue, Toyoki Fujihara, Naoya Nakanishi
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Patent number: 10217973Abstract: A prismatic secondary battery includes a first current collector and a second current collector. The first current collector includes a first base disposed along a sealing plate. The second current collector includes a second base disposed along the sealing plate. A distance between an end portion of a wound electrode body facing the sealing plate and a surface of the first base facing the wound electrode body at an end portion of the first base on a central side in the longitudinal direction of the sealing plate is shorter than a distance between the end portion of the wound electrode body facing the sealing plate and a surface of the second base facing the wound electrode body at an end portion of the second base on the central side. An insulating buffer is disposed between the wound electrode body and the above surface of the first base.Type: GrantFiled: September 21, 2017Date of Patent: February 26, 2019Assignee: SANYO Electric Co., Ltd.Inventors: Tomoharu Arai, Tetsuya Okado, Shinichirou Yoshida, Masashi Muraoka, Toyoki Fujihara
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Publication number: 20190013508Abstract: A nonaqueous electrolyte secondary battery includes an electrode assembly including a negative plate and a positive plate including a positive electrode active material mix layer, a nonaqueous electrolyte, a battery case that houses the electrode assembly and the nonaqueous electrolyte, and a pressure-sensitive safety system that operates when the pressure in the battery case reaches a value greater than or equal to a predetermined value. The positive electrode active material mix layer contains lithium carbonate and lithium phosphate. The average particle size of lithium carbonate contained in the positive electrode active material mix layer is greater than the average particle size of lithium phosphate contained in the positive electrode active material mix layer. The number of particles of lithium carbonate contained in the positive electrode active material mix layer is less than the number of particles of lithium phosphate contained in the positive electrode active material mix layer.Type: ApplicationFiled: June 29, 2018Publication date: January 10, 2019Applicant: SANYO Electric Co., Ltd.Inventors: Yuu Takanashi, Masao Inoue, Toyoki Fujihara
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Publication number: 20180358623Abstract: A non-aqueous electrolyte secondary battery includes a pressure-sensitive current shut-off mechanism, wherein a positive electrode core body exposed portion is disposed at one end portion of a flat rolled electrode assembly, a negative electrode core body exposed portion is disposed at the other end portion, lithium carbonate is contained in a positive electrode mix layer, and a protective layer is disposed along the border with the positive electrode mix layer at the position opposite to a separator on the positive electrode core body exposed portion.Type: ApplicationFiled: August 14, 2018Publication date: December 13, 2018Applicant: SANYO Electric Co., Ltd.Inventors: Shingo Tode, Toyoki Fujihara, Toshiyuki Nohma
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Patent number: 10096864Abstract: A nonaqueous electrolyte secondary battery includes a pressure-sensitive current interrupt mechanism, and a flat wound electrode body that is inserted in an outer casing with a winding axis of the flat wound electrode body arranged to extend in a horizontal direction. A positive electrode plate, a negative electrode plate, and a separator in a winding end portion of the flat wound electrode body are all directed toward a top side.Type: GrantFiled: June 10, 2014Date of Patent: October 9, 2018Assignee: SANYO ELECTRIC CO., LTD.Inventors: Keisuke Minami, Toyoki Fujihara, Toshiyuki Nohma
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Publication number: 20180269449Abstract: A battery pack includes a plurality of prismatic secondary batteries with spacers each interposed therebetween. The prismatic secondary batteries each include a flat wound electrode body that is formed by winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween; a prismatic outer body that houses the wound electrode body; and a sealing plate that seals an opening of the flat wound electrode body. The wound electrode body has a wound positive electrode core-exposed portion at one end portion and a wound negative electrode core-exposed portion at the other end portion. A positive electrode current collector is joined to the positive electrode core-exposed portion to form a positive electrode-joined portion, and a negative electrode current collector is joined to the negative electrode core-exposed portion to form a negative electrode-joined portion.Type: ApplicationFiled: December 21, 2017Publication date: September 20, 2018Applicant: SANYO Electric Co., Ltd.Inventors: Tetsuya Okado, Keisuke Minami, Masashi Muraoka, Tomoharu Arai, Toyoki Fujihara
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Patent number: 10079386Abstract: A non-aqueous electrolyte secondary battery includes a pressure-sensitive current shut-off mechanism, wherein a positive electrode core body exposed portion is disposed at one end portion of a flat rolled electrode assembly, a negative electrode core body exposed portion is disposed at the other end portion, lithium carbonate is contained in a positive electrode mix layer, and a protective layer is disposed along the border with the positive electrode mix layer at the position opposite to a separator on the positive electrode core body exposed portion.Type: GrantFiled: June 10, 2014Date of Patent: September 18, 2018Assignee: SANYO ELECTRIC CO., LTD.Inventors: Shingo Tode, Toyoki Fujihara, Toshiyuki Nohma
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Publication number: 20180097206Abstract: A prismatic secondary battery includes a first current collector and a second current collector. The first current collector includes a first base disposed along a sealing plate. The second current collector includes a second base disposed along the sealing plate. A distance between an end portion of a wound electrode body facing the sealing plate and a surface of the first base facing the wound electrode body at an end portion of the first base on a central side in the longitudinal direction of the sealing plate is shorter than a distance between the end portion of the wound electrode body facing the sealing plate and a surface of the second base facing the wound electrode body at an end portion of the second base on the central side. An insulating buffer is disposed between the wound electrode body and the above surface of the first base.Type: ApplicationFiled: September 21, 2017Publication date: April 5, 2018Applicant: SANYO ELECTRIC CO., LTD.Inventors: Tomoharu Arai, Tetsuya Okado, Shinichirou Yoshida, Masashi Muraoka, Toyoki Fujihara
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Publication number: 20180097219Abstract: A nonaqueous electrolyte secondary battery including a positive electrode collector electrically connected to a positive electrode plate, a negative electrode collector electrically connected to a negative electrode plate. At least one of the collectors includes a first-side base portion disposed near the sealing plate, and a first-side lead portion connected to one end portion of the first-side base portion and extending towards an electrode body. The first-side lead portion includes a first-side power generating element joining portion joined to a lateral side of the electrode body, and a first-side inclined portion inclined with respect to a thickness direction of the electrode body from the first-side power generating element joining portion towards an outer side in the thickness direction. A total weight of the electrode body and nonaqueous electrolyte contained in the electrode body ranges from 200 g or more to 500 g or less.Type: ApplicationFiled: August 23, 2017Publication date: April 5, 2018Applicant: Sanyo Electric Co., Ltd.Inventors: Masashi Muraoka, Tomoharu Arai, Tetsuya Okado, Shingo Tode, Toyoki Fujihara