Patents by Inventor Takahisa Ohsaki
Takahisa Ohsaki 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: 9029008Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent ?-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.Type: GrantFiled: January 3, 2013Date of Patent: May 12, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Norio Takami, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Patent number: 8808910Abstract: A non-aqueous electrolyte secondary battery includes an electrode body including a positive electrode and a negative electrode superimposed upon each other with a separator interposed therebetween. The negative electrode is superimposed upon the positive electrode in a state where a negative electrode active material layer, except the part on a proximal end part of a negative electrode tab, is positioned inside an outer edge of a positive electrode active material layer of the positive electrode. A width H1 of the negative electrode active material layer including the part on the proximal end part of the negative electrode tab, width H2 of the negative electrode active material layer or negative electrode current collector at a part other than the negative electrode tab, and width H3 of the positive electrode active material layer are formed to satisfy the relationships of H2<H3, and (H1?H2)?(H3?H2)÷2.Type: GrantFiled: August 30, 2013Date of Patent: August 19, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Hideaki Morishima, Takashi Kobayashi, Seiichi Hikata, Yoshikazu Kobayashi, Takahisa Ohsaki, Natsuki Toyota, Haruchika Ishii
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Publication number: 20140004419Abstract: A non-aqueous electrolyte secondary battery includes an electrode body including a positive electrode and a negative electrode superimposed upon each other with a separator interposed therebetween. The negative electrode is superimposed upon the positive electrode in a state where a negative electrode active material layer, except the part on a proximal end part of a negative electrode tab, is positioned inside an outer edge of a positive electrode active material layer of the positive electrode. A width H1 of the negative electrode active material layer including the part on the proximal end part of the negative electrode tab, width H2 of the negative electrode active material layer or negative electrode current collector at a part other than the negative electrode tab, and width H3 of the positive electrode active material layer are formed to satisfy the relationships of H2<H3, and (H1?H2)?(H3?H2)÷2.Type: ApplicationFiled: August 30, 2013Publication date: January 2, 2014Applicant: Kabushiki Kaisha ToshibaInventors: Hideaki MORISHIMA, Takashi Kobayashi, Seiichi Hikata, Yoshikazu Kobayashi, Takahisa Ohsaki, Natsuki Toyota, Haruchika Ishii
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Publication number: 20130122351Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent ?-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.Type: ApplicationFiled: January 3, 2013Publication date: May 16, 2013Inventors: Norio TAKAMI, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Publication number: 20130065124Abstract: A non-aqueous electrolyte secondary battery includes an electrode body including a positive electrode and a negative electrode superimposed upon each other with a separator interposed therebetween. The negative electrode is superimposed upon the positive electrode in a state where a negative electrode active material layer, except the part on a proximal end part of a negative electrode tab, is positioned inside an outer edge of a positive electrode active material layer of the positive electrode. A width H1 of the negative electrode active material layer including the part on the proximal end part of the negative electrode tab, width H2 of the negative electrode active material layer or negative electrode current collector at a part other than the negative electrode tab, and width H3 of the positive electrode active material layer are formed to satisfy the relationships of H2<H3, and (H1?H2)?(H3?H2)÷2.Type: ApplicationFiled: November 6, 2012Publication date: March 14, 2013Inventors: Hideaki MORISHIMA, Takashi KOBAYASHI, Seiichi HIKATA, Yoshikazu KOBAYASHI, Takahisa OHSAKI, Natsuki TOYOTA, Haruchika ISHII
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Patent number: 8383275Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent ?-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.Type: GrantFiled: October 24, 2002Date of Patent: February 26, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Norio Takami, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Patent number: 8334071Abstract: A non-aqueous electrolyte secondary battery includes an electrode body including a positive electrode and a negative electrode superimposed upon each other with a separator interposed therebetween. The negative electrode is superimposed upon the positive electrode in a state where a negative electrode active material layer, except the part on a proximal end part of a negative electrode tab, is positioned inside an outer edge of a positive electrode active material layer of the positive electrode. A width H1 of the negative electrode active material layer including the part on the proximal end part of the negative electrode tab, width H2 of the negative electrode active material layer or negative electrode current collector at a part other than the negative electrode tab, and width H3 of the positive electrode active material layer are formed to satisfy the relationships of H2<H3, and (H1?H2)?(H3?H2)÷2.Type: GrantFiled: September 28, 2009Date of Patent: December 18, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Hideaki Morishima, Takashi Kobayashi, Seiichi Hikata, Yoshikazu Kobayashi, Takahisa Ohsaki, Natsuki Toyota, Haruchika Ishii
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Patent number: 7727676Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent ?-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.Type: GrantFiled: June 19, 2006Date of Patent: June 1, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Norio Takami, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Publication number: 20100081052Abstract: A non-aqueous electrolyte secondary battery includes an electrode body including a positive electrode and a negative electrode superimposed upon each other with a separator interposed therebetween. The negative electrode is superimposed upon the positive electrode in a state where a negative electrode active material layer, except the part on a proximal end part of a negative electrode tab, is positioned inside an outer edge of a positive electrode active material layer of the positive electrode. A width H1 of the negative electrode active material layer including the part on the proximal end part of the negative electrode tab, width H2 of the negative electrode active material layer or negative electrode current collector at a part other than the negative electrode tab, and width H3 of the positive electrode active material layer are formed to satisfy the relationships of H2<H3, and (H1?H2)?(H3?H2)÷2.Type: ApplicationFiled: September 28, 2009Publication date: April 1, 2010Inventors: Hideaki MORISHIMA, Takashi Kobayashi, Seiichi Hikata, Yoshikazu Kobayashi, Takahisa Ohsaki, Natsuki Toyota, Haruchika Ishii
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Publication number: 20060240328Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent ?-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.Type: ApplicationFiled: June 19, 2006Publication date: October 26, 2006Inventors: Norio Takami, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Publication number: 20060234131Abstract: The present invention provides a nonaqueoxus electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent ?-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.Type: ApplicationFiled: June 19, 2006Publication date: October 19, 2006Inventors: Norio Takami, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Patent number: 6890684Abstract: There is proposed a non-aqueous electrolyte secondary battery having an electrode assembly which is impregnated with a non-aqueous electrolyte solution, wherein the battery can be made thin while maintaining improved capacity, large-current characteristics and cycle life. The non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte solution. The production process of the battery comprises steps of preparing an electrode assembly by interposing a separator between a positive electrode and a negative electrode, impregnating the electrode assembly with an organic solvent which can dissolve the binder of the positive- and/or negative electrodes, bonding the positive electrode and the separator together and bonding the negative electrode and the separator together by drying the electrode assembly, and impregnating the electrode assembly with a non-aqueous electrolyte solution.Type: GrantFiled: June 17, 2002Date of Patent: May 10, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Takahisa Ohsaki, Norio Takami, Hiroyuki Hasebe, Motoya Kanda, Asako Sato, Takashi Kuboki, Shuji Yamada
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Publication number: 20040241537Abstract: The invention presents an air battery comprising a battery container having a surface in which air pores are formed, an electrode group provided in the battery container and including an air positive electrode, and a laminated sheet including a barrier film which is provided between the surface and the air positive electrode, and of which oxygen permeation coefficient is 1×10−14 mol·m/m2·sec·Pa or less, and a gap holding member which is laminated on the barrier film and is opposite to the air positive electrode, and the gap holding member comprising at least one selected from the group consisting of a porous film, a nonwoven fabric, and a woven fabric, wherein the air pores of the battery container are closed by the laminated sheet.Type: ApplicationFiled: March 24, 2004Publication date: December 2, 2004Inventors: Tetsuo Okuyama, Takashi Kuboki, Takahisa Ohsaki, Norio Takami
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Patent number: 6623889Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising a positive electrode, a negative electrode containing a carbon material having an immersion heat ratio (&Dgr;Hin/&Dgr;Hih) defined by formula (1), and a nonaqueous electrolyte: 1.2≦&Dgr;Hin/&Dgr;Hih≦2 (1) where &Dgr;Hih denotes the immersion heat for n-heptane of the carbon material, and &Dgr;Hin denotes the immersion heat for 1-nitropropane of the carbon material.Type: GrantFiled: December 20, 2000Date of Patent: September 23, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Tomokazu Morita, Takahisa Ohsaki, Norio Takami
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Patent number: 6589690Abstract: There is provided a secondary battery comprising an electrode group comprising a positive electrode, a negative electrode having a negative electrode collector and a negative electrode layer held to the collector, and a separator interposed between the positive electrode and the negative electrode layer, a nonaqueous electrolyte held by the electrode group, and a jacket housing the electrode group and having a thickness of not more than 0.3 mm, wherein the positive electrode, the negative electrode and the separator are formed integral, and the peeling strength between the negative electrode layer and the separator is lower than the peeling strength between the negative electrode layer and the negative electrode collector.Type: GrantFiled: March 28, 2000Date of Patent: July 8, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Asako Sato, Takashi Kuboki, Shuji Yamada, Hiroyuki Hasebe, Norio Takami, Takahisa Ohsaki, Motoya Kanda
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Publication number: 20030118913Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent &ggr;-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.Type: ApplicationFiled: October 24, 2002Publication date: June 26, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Norio Takami, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Patent number: 6544682Abstract: Provided is a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode, and a porous separator interposed between the positive electrode and the negative electrode, the pores of the porous separator being closed when heated, a nonaqueous electrolyte held by the porous separator, and a jacket formed of a sheet including a thermoplastic resin layer forming at least a portion of the inner surface, having the electrode group housed therein, and having mutually facing regions of the thermoplastic resin layer heat-sealed to each other to seal the electrode group therein, wherein the positive electrode, the negative electrode and the separator are made integral, and the thermoplastic resin layer has a melting point higher than a pore-closing initiating temperature of the porous separator at which the pores of the separator begin to be closed.Type: GrantFiled: January 20, 2000Date of Patent: April 8, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Norio Takami, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Publication number: 20030035995Abstract: There is proposed a non-aqueous electrolyte secondary battery having an electrode assembly which is impregnated with a non-aqueous electrolyte solution, wherein the battery can be made thin while maintaining improved capacity, large-current characteristics and cycle life.Type: ApplicationFiled: June 17, 2002Publication date: February 20, 2003Applicant: KABUSHI KAISHA TOSHIBAInventors: Takahisa Ohsaki, Norio Takami, Hiroyuki Hasebe, Motoya Kanda, Asako Sato, Takashi Kuboki, Shuji Yamada
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Patent number: 6503657Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent &ggr;-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.Type: GrantFiled: October 29, 1999Date of Patent: January 7, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Norio Takami, Hiroyuki Hasebe, Takahisa Ohsaki, Motoya Kanda
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Patent number: 6468693Abstract: The present invention provides a nonaqueous electrolyte secondary battery, comprising a jacket having a wall thickness not larger than 0.25 mm, a positive electrode housed in the jacket and containing a positive electrode active material, a negative electrode housed in the jacket and containing a negative electrode active material, and a nonaqueous electrolyte housed in the jacket, wherein the positive electrode active material comprises at least one kind of oxide selected from the group consisting of an oxide containing an element M, Li and Ni and an oxide containing an element M, Li, Ni and Co, the element M being at least one element selected from the group consisting of Al, B, Sn and Nb, and the pH of the positive electrode active material falls within a range of between 10 and 12.Type: GrantFiled: July 28, 2000Date of Patent: October 22, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Norio Takami, Takahisa Ohsaki