Patents by Inventor Makihiro Otohata
Makihiro Otohata 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: 8062780Abstract: Battery element 2 is sandwiched between and surrounded by casing films 4, 5 each having a thermo-fusing resin layer, and is sealed by thermally fused region 6 formed by thermally fusing around the overall periphery. Cross-link structure portion 13 is formed in part of thermally fused region 6 by cross-linking casing film 5, and gas release chamber 12 is formed with its leading end positioned in cross-link structure portion 13. Gas release chamber 12 is a portion which is surrounded by thermally fused region 6 along its periphery, and in which casing films 4, 5 are not thermally fused. Tube 14 which is open at both ends is connected to gas release chamber 12, while sandwiched between casing films 4, 5, with its leading end positioned in gas release chamber 12.Type: GrantFiled: March 10, 2006Date of Patent: November 22, 2011Assignees: NEC Corporation, Fuji Jukogyo Kabushiki KashaInventors: Hiroshi Yageta, Makihiro Otohata, Masatomo Mizuta, Takeshi Kanai
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Publication number: 20110143176Abstract: A film-packed battery includes a battery element and a packing film which houses the battery element and includes a main heat-sealed portion which is formed around the battery element, and a projecting heat-sealed portion which projects from the main heat-sealed portion toward the battery element, and a gas releasing portion formed in the projecting heat-sealed portion and the main heat-sealed portion adjacent to the projecting heat-sealed portion, wherein a distal end of the gas releasing portion reaches the projecting heat-sealed portion and the gas releasing portion connects external air with a heat-sealed interface of the packing film.Type: ApplicationFiled: February 16, 2011Publication date: June 16, 2011Applicant: NEC CorporationInventors: Makihiro Otohata, Nobuaki Yoshioka
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Patent number: 7931982Abstract: A film-covered battery 1 includes battery element 6 and laminate films 3 and 4 for sealing battery element 6. Laminate films 3 and 4 are realized by laminating a heat-seal resin layer and a metal foil layer and seal battery element 6 by arranging the films on either side of battery element 6 with the heat-seal resin layers disposed on the inside and then heat-sealing at sealing areas 3a and 4a on the outer peripheries of the films. The areas of the laminate films 3 and 4 other than sealing areas 3a and 4a are electron beam irradiation areas 3b and 4b that are irradiated by an electron beam. Cross-linked structures are formed in the heat-seal resin layers of electron beam irradiation areas 3b and 4b by irradiation by an electron beam.Type: GrantFiled: July 29, 2004Date of Patent: April 26, 2011Assignee: NEC CorporationInventors: Makihiro Otohata, Hiroshi Yageta
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Patent number: 7901806Abstract: In a film-packed battery which stores a battery element (9) with packing films (8a, 8b) and sealed by heat-sealing heat-sealed surfaces of the packing films around the battery element, a heat-sealed portion (6) projecting toward a battery element is provided at part of a heat-sealed portion (5), and a gas releasing portion (7) is formed close to the projecting heat-sealed portion. A pressure safety valve for safely releasing a gas to the outside when the gas is generated in the battery is provided without lowering the reliability of the battery.Type: GrantFiled: July 16, 2003Date of Patent: March 8, 2011Assignee: NEC CorporationInventors: Makihiro Otohata, Nobuaki Yoshioka
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Patent number: 7736801Abstract: The occurrence of micro-crack is prevented at the root of a thermally sealed area of casing materials even if a thick electric device element is sealed. Film covered battery 10 has cell element 13 to which leads 12a, 12b are connected, and casing films 11 for sealing cell element 13 with leads 12a, 12b extended therefrom. Casing films 11 are thermally sealed along the periphery to seal cell element 13. Thermally sealed area 13 of casing films 11 is positioned between both surfaces of cell element 13 in the thickness direction of cell element 13. On a side of casing films 11 from which leads 12a, 12b are not extended, close contact zone 15, in which casing films 11 are not thermally sealed to each other but are in close contact with each other, is formed continuously to a space which receives cell element 13. Close contact zone 15 has a length of one-half or more of the distance from one end to the other end of an inner edge of thermally sealed area 14.Type: GrantFiled: March 10, 2005Date of Patent: June 15, 2010Assignee: NEC CorporationInventors: Hiroshi Yageta, Makihiro Otohata
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Publication number: 20100112436Abstract: A packaged battery, an assembled battery, and a film-covered battery, which can prevent a dangerous state involving a high-pressure gas filled in the film-covered battery while ensuring a sealing reliability, are provided. The Packaged battery includes film-covered battery 1 including a battery element and exterior films forming a sealed space housing the battery element, and holding member 10 holding film-covered battery 1. The sealed space includes a housing section housing the battery element, and a pocket communicating with the housing section to expand when the pressure in the sealed space increases. The pocket includes a safety valve which activates when the pocket expands. Holding member 10 includes an opening and a cavity fitting the housing section therein. When the housing section is fitted into the cavity, at least part of the pocket and the safety valve protrude to the outside of the holding member from the opening.Type: ApplicationFiled: January 9, 2008Publication date: May 6, 2010Applicant: NEC CorporationInventors: Masatomo Mizuta, Kazuaki Utsumi, Makihiro Otohata, Hiroshi Yageta
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Patent number: 7604894Abstract: A film covered battery has a battery element, a positive and a negative lead terminal connected to the battery element, and a casing for sealing the lead terminals and the battery element together with an electrolytic solution, with portions of the lead terminals extending therefrom. The casing has a buffer in at least a portion thereof for accumulating a gas generated within the casing through deformation of the casing. The buffer is formed continuously with a region for accommodating the battery element.Type: GrantFiled: October 17, 2007Date of Patent: October 20, 2009Assignee: NEC CorporationInventors: Hiroshi Yageta, Makihiro Otohata
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Patent number: 7579111Abstract: A film-covered electric device has an electric device element and casing films. The casing films include a sealing area formed by thermally fusing the facing surfaces of the casing films together around the periphery of the electric device element, an electric device element receiving part encapsulating the electric device element inside the sealing area, and unfused portions formed in the shape of cove communicating with the electric device element receiving part. The casing films further include a stress concentrating portion touching the unfused portions for concentrating thereon the peeling stress of the casing films generated at the sealing area by the expansion of the electric device element receiving part, and a pressure releasing part is formed in the stress concentrating portion.Type: GrantFiled: July 31, 2007Date of Patent: August 25, 2009Assignee: NEC CorporationInventors: Masatomo Mizuta, Hiroshi Yageta, Makihiro Otohata, Kiyokazu Oikawa, Toshihiko Mankyu
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Publication number: 20090081542Abstract: Battery element 2 is sandwiched between and surrounded by casing films 4, 5 each having a thermo-fusing resin layer, and is sealed by thermally fused region 6 formed by thermally fusing around the overall periphery. Cross-link structure portion 13 is formed in part of thermally fused region 6 by cross-linking casing film 5, and gas release chamber 12 is formed with its leading end positioned in cross-link structure portion 13. Gas release chamber 12 is a portion which is surrounded by thermally fused region 6 along its periphery, and in which casing films 4, 5 are not thermally fused. Tube 14 which is open at both ends is connected to gas release chamber 12, while sandwiched between casing films 4, 5, with its leading end positioned in gas release chamber 12.Type: ApplicationFiled: March 10, 2006Publication date: March 26, 2009Applicants: NEC Corporation, Fuji Jukogyo Kabushiki KaishaInventors: Hiroshi Yageta, Makihiro Otohata, Masatomo Mizuta, Takeshi Kanai
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Patent number: 7498099Abstract: A film covered battery has a battery element, a casing for sealing the battery element, and lead terminals connected to a positive electrode and a negative electrode, respectively, of the battery element, and extending from the casing. The casing is flexible, and is comprised of two halves for sealably sandwiching the battery element on both sides in the thickness direction thereof. One of the halves of the casing, sandwiching the battery element, is formed with a recess for receiving the battery element. The lead terminals are each connected to the battery element at a position inside of both surfaces of the battery element in the thickness direction.Type: GrantFiled: February 26, 2004Date of Patent: March 3, 2009Assignee: NEC CorporationInventors: Makihiro Otohata, Hiroshi Yageta
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Patent number: 7468220Abstract: A film covered battery has a battery element, a positive and a negative lead terminal connected to the battery element, and a casing for sealing the lead terminals and the battery element together with an electrolytic solution, with portions of the lead terminals extending therefrom. The casing has a buffer in at least a portion thereof for accumulating a gas generated within the casing through deformation of the casing. The buffer is formed continuously with a region for accommodating the battery element.Type: GrantFiled: March 2, 2004Date of Patent: December 23, 2008Assignee: NEC CorporationInventors: Hiroshi Yageta, Makihiro Otohata
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Publication number: 20080233468Abstract: A releasing pressure and a pressure releasing position, when enclosing films are expanded by gas produced at an abnormal time, are easily and positively configured. A film-enclosed battery (1) has a battery element (2) and two enclosing films (4, 5) for sealing the battery element (2). The enclosing films (4, 5) include heat-sealable resin layers and air-impermeable layers, and the heat-sealable resin layers and air-impermeable layers, and the heat-sealable resin layers that are face each other hold the battery element (2) and seal the battery element (2) when their peripheral edges are thermally fused. A cross-linking structure (8) formed by cross-linking heat-sealable resin layer is formed in one of the enclosing films (4, 5) so that a region in part of a heat-sealed area (6) has a position exposed to a battery element housing unit and another portion in contact with outside air.Type: ApplicationFiled: August 5, 2005Publication date: September 25, 2008Applicant: NEC CORPORATIONInventors: Makihiro Otohata, Hiroshi Yageta
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Patent number: 7410724Abstract: A battery is fabricated on the basis of at least one of the following four concepts, i.e., lead terminals passing through a package not lower than the uppermost surface of an electrolyte cell, lead terminals projecting from a package in directions opposite to each other, a film package with a crushed portion expandable for accumulating gas and sheets of gas barrier sealant for keeping the boundaries between component parts of a package sealed; the seal is hardly broken so that the battery is durable and highly reliable.Type: GrantFiled: July 19, 2006Date of Patent: August 12, 2008Assignee: NEC CorporationInventors: Hiroshi Yageta, Makihiro Otohata, Nobuaki Yoshioka
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Publication number: 20080090143Abstract: A film covered battery has a battery element, a positive and a negative lead terminal connected to the battery element, and a casing for sealing the lead terminals and the battery element together with an electrolytic solution, with portions of the lead terminals extending therefrom. The casing has a buffer in at least a portion thereof for accumulating a gas generated within the casing through deformation of the casing. The buffer is formed continuously with a region for accommodating the battery element.Type: ApplicationFiled: October 17, 2007Publication date: April 17, 2008Applicant: NEC LAMILION ENERGY, LTD.Inventors: Hiroshi YAGETA, Makihiro OTOHATA
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Publication number: 20080008936Abstract: A film-covered electric device has an electric device element and casing films. The casing films include a sealing area formed by thermally fusing the facing surfaces of the casing films together around the periphery of the electric device element, an electric device element receiving part encapsulating the electric device element inside the sealing area, and unfused portions formed in the shape of cove communicating with the electric device element receiving part. The casing films further include a stress concentrating portion touching the unfused portions for concentrating thereon the peeling stress of the casing films generated at the sealing area by the expansion of the electric device element receiving part, and a pressure releasing part is formed in the stress concentrating portion.Type: ApplicationFiled: July 31, 2007Publication date: January 10, 2008Applicant: NEC LAMILION ENERGY, LTD.Inventors: Masatomo Mizuta, Hiroshi Yageta, Makihiro Otohata, Kiyokazu Oikawa, Toshihiko Mankyu
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Patent number: 7267906Abstract: A film-covered electric device has an electric device element and casing films. The casing films include a sealing area formed by thermally fusing the facing surfaces of the casing films together around the periphery of the electric device element, an electric device element receiving part encapsulating the electric device element inside the sealing area, and unfused portions formed in the shape of cove communicating with the electric device element receiving part. The casing films further include a stress concentrating portion touching the unfused portions for concentrating thereon the peeling stress of the casing films generated at the sealing area by the expansion of the electric device element receiving part, and a pressure releasing part is formed in the stress concentrating portion.Type: GrantFiled: January 14, 2005Date of Patent: September 11, 2007Assignee: NEC CorporationInventors: Masatomo Mizuta, Hiroshi Yageta, Makihiro Otohata, Kiyokazu Oikawa, Toshihiko Mankyu
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Publication number: 20070009795Abstract: A joint section where covering films 2a, 2b of film-covered battery 1 are heat-sealed together is formed with flat surface 6? having thickness t1 and groove 6 having thickness t2. Groove 6 serves to reduce the projection area of film-covered battery 1 by folding side 2c toward receiving section 2a1 with groove 6 serving as an edge, and groove 6 is made thinner than flat surface 6? by ? t=t1?t2. Therefore, the length of covering films 2a, 2b produced on outer side 6a is shortened as compared with the case of folding the portion that has thickness t1.Type: ApplicationFiled: September 30, 2004Publication date: January 11, 2007Inventors: Makihiro Otohata, Hiroshi Yageta
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Publication number: 20060257732Abstract: A battery is fabricated on the basis of at least one of the following four concepts, i.e., lead terminals passing through a package not lower than the uppermost surface of an electrolyte cell, lead terminals projecting from a package in directions opposite to each other, a film package with a crushed portion expandable for accumulating gas and sheets of gas barrier sealant for keeping the boundaries between component parts of a package sealed; the seal is hardly broken so that the battery is durable and highly reliable.Type: ApplicationFiled: July 19, 2006Publication date: November 16, 2006Applicant: NEC CORPORATIONInventors: Hiroshi Yageta, Makihiro Otohata, Nobuaki Yoshioka
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Publication number: 20060210872Abstract: The occurrence of micro-crack is prevented at the root of a thermally sealed area of casing materials even if a thick electric device element is sealed. Film covered battery 10 has cell element 13 to which leads 12a, 12b are connected, and casing films 11 for sealing cell element 13 with leads 12a, 12b extended therefrom. Casing films 11 are thermally sealed along the periphery to seal cell element 13. Thermally sealed area 13 of casing films 11 is positioned between both surfaces of cell element 13 in the thickness direction of cell element 13. On a side of casing films 11 from which leads 12a, 12b are not extended, close contact zone 15, in which casing films 11 are not thermally sealed to each other but are in close contact with each other, is formed continuously to a space which receives cell element 13. Close contact zone 15 has a length of one-half or more of the distance from one end to the other end of an inner edge of thermally sealed area 14.Type: ApplicationFiled: March 10, 2005Publication date: September 21, 2006Inventors: Hiroshi Yageta, Makihiro Otohata
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Patent number: 7105248Abstract: A battery is fabricated on the basis of at least one of the following four concepts, i.e., lead terminals passing through a package not lower than the uppermost surface of an electrolyte cell, lead terminals projecting from a package in directions opposite to each other, a film package with a crushed portion expandable for accumulating gas and sheets of gas barrier sealant for keeping the boundaries between component parts of a package sealed; the seal is hardly broken so that the battery is durable and highly reliable.Type: GrantFiled: September 4, 2002Date of Patent: September 12, 2006Assignee: NEC CorporationInventors: Hiroshi Yageta, Makihiro Otohata, Nobuaki Yoshioka