Patents by Inventor Shigeru Aihara

Shigeru Aihara 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).

  • Publication number: 20010049050
    Abstract: A conventional battery has a problem that when a temperature of the battery reaches at least 100° C. due to internal short-circuit or the like, large short-circuit current is generated, and therefore, a temperature of the battery further increases due to exothermic reaction to increase the short-circuit current. Also, if an aluminum laminated pack and the like are used as a casing material for the purpose of lightweight and improved energy density of the battery, and if an adhesive agent is used to joint an electrode with a separator to maintain the contact thereof, there is a problem that the adhesive agent intrudes into the opening part of the separator and the opening part area and the hole diameter decrease to bring about unfavorable results for discharge load characteristics of the battery.
    Type: Application
    Filed: December 22, 2000
    Publication date: December 6, 2001
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Jun Aragane, Makiko Kise, Syoji Yoshioka, Shigeru Aihara, Daigo Takemura, Hisashi Shiota, Takashi Nishimura, Hiroaki Urushibata
  • Patent number: 6322599
    Abstract: A method of fabricating a lithium ion secondary battery, wherein a positive electrode 3 is prepared by bonding a positive electrode active material layer 7 to a positive electrode collector 6, a negative electrode 5 is prepared by bonding a negative electrode active material layer 9 to a negative electrode collector 10 and a separator 4 which is arranged between these two electrodes and closely adhered thereto by bonding, using a fluoride containing adhesive resin mixed with N-methylpyrrolidone solvent and in which the N-methylpyrrolidone solvent is evaporated to produce through holes, which communicate the positive electrode active material layer 7 and the negative electrode active material layer 9 with the separator 4.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: November 27, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kouji Hamano, Yasuhiro Yoshida, Hisashi Shiota, Shou Shiraga, Shigeru Aihara, Michio Murai, Takayuki Inuzuka
  • Publication number: 20010037557
    Abstract: It is an object of the invention to provide a process for producing a lithium ion battery comprising adhering a positive and a negative electrode to an ion conducting layer (separator) with an adhesive resin thereby to obtain sufficient joint strength between the electrodes and the separator while securing ion conductivity among the positive and negative electrodes and the separator. The steps of heating an adhesive liquid (4) which is a mixture of a solvent and a resin and in which the resin is not completely dissolved at or below room temperature and applying the heated adhesive liquid to the adhesive surface of the separator (3) or of the electrode (1 or 2), superposing the separator and the electrodes with their adhesive surfaces facing each other, and drying the applied adhesive liquid are carried out in order. The solubility of the resin is increased when the adhesive liquid is to be applied to make uniform application feasible.
    Type: Application
    Filed: October 5, 1999
    Publication date: November 8, 2001
    Inventors: YASUHIRO YOSHIDA, MICHIO MURAI, TAKAYUKI INUZUKA, SHIGERU AIHARA, DAIGO TAKEMURA, HISASHI SHIOTA, JUN ARAGANE, HIROAKI URUSHIBATA, KOUJI HAMANO
  • Publication number: 20010036575
    Abstract: The battery of the present invention comprises the electrode which contains the pre-determined amount of electronically conductive material at which resistance increases in accordance with temperature rise and conductive agent; the electrode wherein the ratio of the total amount of the electronically conductive material and the conductive agent to the active material is set to a pre-determined value; and the electrode wherein the average particle size of the conductive agent based on the average particle size of the electronically conductive material is in a pre-determined range.
    Type: Application
    Filed: February 9, 2001
    Publication date: November 1, 2001
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Makiko Kise, Syoji Yoshioka, Hironori Kuriki, Hiroaki Urushibata, Hisashi Shiota, Jun Aragane, Takashi Nishimura, Shigeru Aihara, Daigo Takemura
  • Patent number: 6306540
    Abstract: The present invention relates to an electrolytic solution excellent in stability, and also relates to a battery excellent in battery performance and having an outer structure having light weight. The electrolytic solution contains a supporting electrolyte and a gas formation inhibitor in the solvent. The gas formation inhibitor contains a decomposition product of the supporting electrolyte with formation of a gas in the solvent. It functions as controlling to solution equilibrium in the electrolytic solution participating in decomposition reaction of the supporting electrolyte. A battery is obtained by filling the electrolytic solution between a positive electrode and a negative electrode.
    Type: Grant
    Filed: August 22, 2000
    Date of Patent: October 23, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Osamu Hiroi, Kouji Hamano, Yasuhiro Yoshida, Shoji Yoshioka, Hisashi Shiota, Jun Aragane, Shigeru Aihara, Daigo Takemura, Takashi Nishimura, Makiko Kise, Hiroaki Urushibata, Hiroshi Adachi
  • Patent number: 6291102
    Abstract: An object is to provide a lithium ion secondary battery which maintains the electrical connections between each active material layer and a separator without using a firm housing, can have an increased energy density, can take an arbitrary shape, such as a thin shape, exhibits excellent charge and discharge characteristics, and has a large battery capacity. Positive and negative electrode active material particles are bonded to their respective current collectors to form a positive electrode and a negative electrode. The positive and the negative electrode active material layers are joined to a separator with a binder resin so that the joint strength between the separator and the positive and the negative electrode active material layers may be equal to or greater than the joint strength between the positive and the negative electrode active material layers and the respective current collectors to prepare a tabular laminated battery body having a plurality of electrode laminates.
    Type: Grant
    Filed: August 16, 1999
    Date of Patent: September 18, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuhiro Yoshida, Kouji Hamano, Hisashi Shiota, Shigeru Aihara, Takayuki Inuzuka, Michio Murai, Sho Shiraga
  • Publication number: 20010011417
    Abstract: A paste-like active material mixture prepared by mixing an active material powder and a particulate material comprising a polymer soluble in a nonaqueous electrolytic solution is applied to, e.g. collectors 1c and 2c to a uniform thickness, and then dried to form positive and negative electrodes 1, 2 containing an active material powder and a particulate polymer. The two electrodes are assembled into an electrode laminate into which the foregoing electrolytic solution is then injected.
    Type: Application
    Filed: March 16, 2001
    Publication date: August 9, 2001
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuhiro Yoshida, Kouji Hamano, Takayuki Inuzuka, Michio Murai, Hisashi Shiota, Shigeru Aihara, Syo Shiraga
  • Publication number: 20010009736
    Abstract: An object is to provide with good productivity a practical lithium ion secondary battery which secures lightness in weight and safety without using a firm battery case and has reduced internal resistivity. The lithium ion secondary battery comprises a tabular roll type laminated electrode body in which a band-formed positive electrode (3) comprising a positive electrode active material layer (7) and a positive electrode current collector (6) alternates with a band-formed negative electrode (5) comprising a negative electrode active material layer (9) and a negative electrode current collector (10), having therebetween a band-formed rolled separator (4) which holds a lithium ion-containing electrolytic solution, the positive electrode (3) or the negative electrode (5) being adhered with two separators (4) by an adhesive layer (11).
    Type: Application
    Filed: March 16, 2001
    Publication date: July 26, 2001
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Hisashi Shiota, Shigeru Aihara, Daigo Takemura, Jun Aragane, Hiroaki Urushibata, Kouji Hamano, Yasuhiro Yoshida, Takayuki Inuzuka, Michio Murai
  • Publication number: 20010008726
    Abstract: To provide an adhesive for obtaining reliability over a broad temperature range. In a lithium ion secondary battery having a positive electrode 1, a negative electrode 4, and a separator 7 holding an electrolytic solution, an adhesive 8 containing an organic vinyl compound having at least two vinyl groups per molecule is applied between the positive electrode 1 and the separator 7 and between the negative electrode 4 and the separator 7 and cured by reaction to join them.
    Type: Application
    Filed: February 9, 1998
    Publication date: July 19, 2001
    Inventors: MICHIO MURAI, TAKAYUKI INUZUKA, YASUHIRO YOSHIDA, KOUJI HAMANO, HISASHI SHIOTA, SHIGERU AIHARA, SYO SHIRAGA
  • Publication number: 20010007726
    Abstract: In a conventional battery containing metal lithium in the negative electrode, there is a problem that large short-circuit current was generated with temperature rise due to internal short-circuit or the like, and therefore, the temperature of the battery further increases due to exothermic reaction to increase the short-circuit current.
    Type: Application
    Filed: December 22, 2000
    Publication date: July 12, 2001
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Shoji Yoshioka, Makiko Kise, Hiroaki Urushibata, Hisashi Shiota, Jun Aragane, Shigeru Aihara, Daigo Takemura, Takashi Nishimura
  • Publication number: 20010005562
    Abstract: A conventional battery has a problem that a large short-circuit current is generated with temperature rise due to internal short-circuit, and therefore, the temperature of the battery further increases due to heat and the short-circuit current is increased. Also, there is a problem in safety that the sealed part can be easily opened with temperature rise in case of using the aluminum laminated bag as the outer body for sealing the battery body.
    Type: Application
    Filed: December 22, 2000
    Publication date: June 28, 2001
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Shoji Yoshioka, Makiko Kise, Hiroaki Urushibata, Hisashi Shiota, Jun Aragane, Shigeru Aihara, Daigo Takemura, Takashi Nishimura
  • Publication number: 20010005559
    Abstract: A conventional battery has a problem that since a device having PTC function was placed outside the battery or outside the electrode of the battery as a safety device in case of temperature rise due to short-circuit current generated by external short-circuit or the like, a large short-circuit current was generated with temperature rise due to internal short-circuit. And therefore, a temperature of the battery further increases due to exothermic reaction to increase the short-circuit current. Also, there is a problem that structure of the battery become complicated and volume energy density is lowered.
    Type: Application
    Filed: December 22, 2000
    Publication date: June 28, 2001
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Daigo Takemura, Hiroaki Urushibata, Makiko Kise, Shigeru Aihara, Hisashi Shiota, Jun Aragane, Shoji Yoshioka, Takashi Nishimura
  • Publication number: 20010005558
    Abstract: A conventional battery has a problem that a large short-circuit current was generated with temperature rise due to internal short-circuit or the like, and therefore, the temperature of the battery further increases due to exothermic reaction to increase the short-circuit current. The present invention has been carried out in order to solve the above problems. The battery of the present invention is a battery wherein at least one of a positive electrode 1 and a negative electrode 2 comprises an active material layer 6 containing an active material 8 and an electronically conductive material 9 contacted to the active material 8, wherein a solid electrolytic layer 3 is interposed between the above positive electrode 1 and the negative electrode 2, and wherein the above electronically conductive material 9 comprises an electrically conductive filler and a resin so that resistance increases with temperature rise.
    Type: Application
    Filed: December 22, 2000
    Publication date: June 28, 2001
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Shoji Yoshioka, Makiko Kise, Hiroaki Urushibata, Hisashi Shiota, Jun Aragane, Shigeru Aihara, Daigo Takemura, Takashi Nishimura
  • Patent number: 6235066
    Abstract: An object is to provide a process for producing a compact lithium ion secondary battery which exhibits high and stable performance and can take an arbitrary shape such as a thin shape. A process for producing a battery comprised of a positive electrode (1), a negative electrode (4), a separator (7) and an electrolytic solution comprises applying a binder resin solution mainly comprising a fluorocarbon resin or polyvinyl alcohol to a separator (7), laying a positive electrode (1) and a negative electrode (4) alternately on the separator (7) to form a laminated battery body having a plurality of laminates (12), drying the laminated battery body under pressure to form a tabular laminated battery body, and impregnating the tabular laminated battery body with an electrolytic solution.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: May 22, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takayuki Inuzuka, Yasuhiro Yoshida, Michio Murai, Kouji Hamano, Hisashi Shiota, Shigeru Aihara, Sho Shiraga
  • Patent number: 6232014
    Abstract: A practical lithium ion secondary battery. The battery is light in weight and is safe without using a firm battery case. It also has reduced internal resistivity. The battery includes a tabular roll-type laminated electrode body in which a band-formed positive electrode alternates with a band-formed negative electrode, with a band-formed rolled separator being placed therebetween. The positive electrode includes a positive electrode active material layer and a positive electrode current collector. The negative electrode includes a negative electrode active material layer and a negative electrode current collector. The separator holds a lithium ion-containing electrolytic solution. The positive electrode or the negative electrode is adhered with two separators by an adhesive layer.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: May 15, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hisashi Shiota, Shigeru Aihara, Daigo Takemura, Jun Aragane, Hiroaki Urushibata, Kouji Hamano, Yasuhiro Yoshida, Takayuki Inuzuka, Michio Murai
  • Patent number: 6231626
    Abstract: A paste-like active material mixture prepared by mixing an active material powder and a particulate material comprising a polymer soluble in a nonaqueous electrolytic solution is applied to, e.g., collectors 1c and 2c to a uniform thickness, and then dried to form positive and negative electrodes 1, 2 containing an active material powder and a particulate polymer. The two electrodes are assembled into an electrode laminate into which the foregoing electrolytic solution is then injected.
    Type: Grant
    Filed: February 3, 1998
    Date of Patent: May 15, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuhiro Yoshida, Kouji Hamano, Takayuki Inuzuka, Michio Murai, Hisashi Shiota, Shigeru Aihara, Syo Shiraga
  • Patent number: 6225010
    Abstract: A lithium ion secondary battery. The battery maintains an electrical connection between electrodes without using a firm case and can have an increased energy density at a reduced thickness while exhibiting excellent charge and discharge characteristics. The battery includes a plurality of electrode laminates each having a positive electrode, a negative electrode and a separator. The positive electrode includes a positive electrode active material layer and a positive electrode current collector. The negative electrode includes a negative electrode active material layer and a negative electrode current collector. This separator is impregnated with a lithium ion-containing electrolytic solution and is interposed between the electrodes in intimate contact. The positive electrode, negative electrode and separator are joined together in intimate contact with porous adhesive resin layers having through holes.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: May 1, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kouji Hamano, Yasuhiro Yoshida, Hisashi Shiota, Shigeru Aihara, Michio Murai, Takayuki Inuzuka, Sho Shiraga
  • Patent number: 6187472
    Abstract: A thin battery includes a flat battery body having a positive electrode and a negative electrode having an electrolyte layer disposed between the electrodes. A flexible encapsulating bag seals the battery body with a sealing portion. A positive electrode collector tab and a negative electrode collector tab are respectively connected to the positive and negative electrodes. The tabs penetrate the encapsulating bag. At least one of the tabs includes first and second collector tabs and a safety device so that an electrical connection between the first and second collector tabs may be interrupted when the internal pressure of the encapsulating bag exceeds a predetermined value.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: February 13, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hisashi Shiota, Tetsuhide Yokoyama, Shigeru Aihara, Syo Shiraga
  • Patent number: 6136471
    Abstract: Positive and negative active material particles 7a and 9a are adhered to the respective current collectors 6 and 8 by means of a binder resin 11 to prepare positive and negative electrodes 3 and 5. The positive and negative electrode active material layers 7 and 9 are adhered to a separator 4 with the binder resin 11 so that the interlaminar strength between each active material layer 7, 9 and the separator 4 may be not lower than that between the active material layer 7, 9 and the respective current collector 10, 9. A lithium ion-containing electrolytic solution is held in voids 12 made in the active material layers 7, 9 and the separator 4 to complete an electrical connection between the electrodes.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: October 24, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuhiro Yoshida, Kouji Hamano, Hisashi Shiota, Shou Shiraga, Shigeru Aihara, Takayuki Inuzuka, Michio Murai
  • Patent number: 6124061
    Abstract: To obtain a lithium ion secondary battery having excellent charge and discharge characteristics in which electric connection between electrodes can be maintained without requiring a strong armor metal case, so that it can be made into thin forms having large energy density.
    Type: Grant
    Filed: December 3, 1997
    Date of Patent: September 26, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kouji Hamano, Yasuhiro Yoshida, Hisashi Shiota, Shou Shiraga, Shigeru Aihara, Michio Murai, Takayuki Inuzuka