Patents by Inventor Tetsuya Okado
Tetsuya Okado 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: 11769904Abstract: A nonaqueous electrolyte secondary battery includes an electrode assembly and an electrolyte solution. The electrode assembly is impregnated with at least part of the electrolyte solution. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator separates the positive electrode and the negative electrode from each other. The negative electrode includes a negative electrode active material. The negative electrode active material includes graphite. The following relation of a formula (1) is satisfied: “1.60?NPR/AAR?2.55”. “NPR” represents a ratio of a negative electrode charging capacity to a positive electrode charging capacity. “AAR” represents a ratio of an effective discharging capacity of the negative electrode to a total of a capacity corresponding to an amount of inactive lithium adhered to the negative electrode and the effective discharging capacity of the negative electrode.Type: GrantFiled: July 12, 2021Date of Patent: September 26, 2023Assignee: Prime Planet Energy & Solutions, Inc.Inventors: Tetsuya Okado, Hirofusa Tanaka, Masashi Muraoka, Kazuki Takeno, Mio Nosaka
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Publication number: 20220302511Abstract: In a method for producing a nonaqueous electrolyte secondary battery according to the present invention, a wound electrode body and a flat wound electrode body are formed by pressing. The flat wound electrode body and a cover member are connected to each other; a battery case and the cover member are integrated with each other; and a nonaqueous electrolyte solution is injected using a liquid injection port of the cover member, and the liquid injection port is sealed after the liquid injection, thereby forming a nonaqueous electrolyte secondary battery before inspection. Subsequently, the nonaqueous electrolyte secondary battery before inspection is pressed into a predetermined pressed state. A predetermined charge/discharge inspection is performed on the nonaqueous electrolyte secondary battery in the predetermined pressed state. If predetermined inspection specifications are satisfied in the predetermined charge/.Type: ApplicationFiled: July 1, 2020Publication date: September 22, 2022Applicant: SANYO Electric Co., Ltd.Inventors: Tetsuya Okado, Masashi Muraoka, Tomoharu Arai, Atsushi Miyazaki
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Publication number: 20220294087Abstract: A method for producing a secondary battery according to the present invention comprises a step wherein a negative electrode collector, which has a projection having a height of from 0.36 mm to 0.45 mm on at least one of a first member and a second member, said members constituting the negative electrode collector, is resistance-welded with a core multilayer part in such a manner that the core multilayer part is sandwiched between the first member and the second member, while having the projection in contact with the core multilayer part.Type: ApplicationFiled: July 1, 2020Publication date: September 15, 2022Inventors: Tomoharu ARAI, Shinichirou YOSHIDA, Tetsuya OKADO, Masashi MURAOKA, Atsushi MIYAZAKI
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Publication number: 20220077545Abstract: A nonaqueous electrolyte secondary battery includes an exterior package, an electrode assembly, and an electrolyte solution. The exterior package stores the electrode assembly and the electrolyte solution. The electrode assembly is shaped to have a flat shape. The electrode assembly includes a layered body. The layered body includes a first separator, a positive electrode plate, a second separator, and a negative electrode plate. The first separator, the positive electrode plate, the second separator, and the negative electrode plate are layered in this order. The electrode assembly is formed by spirally winding the layered body. Each of the first separator and the second separator has a proportional limit of less than or equal to 10.2 MPa. The proportional limit is measured in a compression test in a thickness direction of each of the first separator and the second separator.Type: ApplicationFiled: September 3, 2021Publication date: March 10, 2022Inventors: Atsushi MIYAZAKI, Tetsuya OKADO, Masashi MURAOKA, Kazutaka MITA, Shuji OGAWA, Takafumi TSUKAGOSHI
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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: 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: 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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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
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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