Patents by Inventor Katsuyuki Hojo
Katsuyuki Hojo 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: 10707533Abstract: To melt and diffuse metallic foreign bodies immixed in electrodes of a nonaqueous electrolyte secondary battery before initial charging, electrodes wound with a separator between a cathode plate and an anode plate are placed in a battery case and the battery case is filled with an electrolyte. After the case has been filled, the electrolyte is allowed to permeate into the electrodes. Then, the electrolyte-filled battery is placed in a processing device, and fixed with a surface pressure between at least 0.1 MPa and 5.0 MPa. Thereafter, the cathode potential is adjusted and held for a period of one hour and 35 hours while the battery remains fixed, after which the pre-initial charging process is terminated.Type: GrantFiled: November 30, 2018Date of Patent: July 7, 2020Assignee: Toyota Jidosha Kabushiki KaishaInventor: Katsuyuki Hojo
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Publication number: 20190103628Abstract: To melt and diffuse metallic foreign bodies immixed in electrodes of a nonaqueous electrolyte secondary battery before initial charging, electrodes wound with a separator between a cathode plate and an anode plate are placed in a battery case and the battery case is filled with an electrolyte. After the case has been filled, the electrolyte is allowed to permeate into the electrodes. Then, the electrolyte-filled battery is placed in a processing device, and fixed with a surface pressure between at least 0.1 MPa and 5.0 MPa. Thereafter, the cathode potential is adjusted and held for a period of one hour and 35 hours while the battery remains fixed, after which the pre-initial charging process is terminated.Type: ApplicationFiled: November 30, 2018Publication date: April 4, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Katsuyuki Hojo
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Publication number: 20180088144Abstract: An angular velocity measuring device measures an angular velocity of a gear that is fixed to a rotary shaft. The angular velocity measuring device includes a pair of magnetic sensors that are arranged at positions facing a tooth flank of the gear and that detect a shape of the tooth flank in a noncontact manner, and a computation unit that is configured to generate a waveform obtained by synthesizing output detection signals of the pair of the magnetic sensors with each other and output an output waveform and calculate the angular velocity of the gear from the output waveform. The magnetic sensors are arranged such that the output detection signals are offset from each other by {(n?1)+(?)} pitches when one pitch is defined as one cycle of the shape of the tooth flank in a circumferential direction of the gear.Type: ApplicationFiled: September 14, 2017Publication date: March 29, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Katsuyuki HOJO
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Patent number: 9406967Abstract: Provided is a method for producing a lithium secondary cell with which the concentrated precipitation of metal impurities at the negative electrode is inhibited and short circuiting is unlikely to occur. The production method includes, assembling together the positive electrode, the separator, and the negative electrode, and then impregnating the assembly with the nonaqueous electrolyte; charging the assembly within 1 min so that a maximum achieved potential of the positive electrode becomes 3.2 V or more with respect to the redox potential of lithium; allowing the assembly to stand for 10 min or less after the charging has ended; and discharging the assembly within 1 min after the standing step.Type: GrantFiled: December 17, 2010Date of Patent: August 2, 2016Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hisataka Fujimaki, Katsuyuki Hojo, Tomotaka Hagino, Hiroyuki Kawaki, Shinya Kamada, Hisanao Kojima
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Patent number: 9255972Abstract: A method of testing a secondary battery includes first to fourth steps. At the first step, the secondary battery after manufacture is charged to a first voltage. At the second step, a second voltage lower than the first voltage is set as a target voltage and discharge or charge is performed in a constant-current constant-voltage mode before the secondary battery is left standing. At the third step, the open circuit voltage of the secondary battery is measured before and after the secondary battery is left standing. At the fourth step, it is determined whether the secondary battery is a conforming item or not based on the difference in the open circuit voltage before and after the secondary battery is left standing.Type: GrantFiled: March 2, 2011Date of Patent: February 9, 2016Assignee: Toyota Jidosha Kabushiki KaishaInventors: Katsuyuki Hojo, Hisanao Kojima, Hiroaki Ikeda, Hisataka Fujimaki
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Publication number: 20130328566Abstract: A method of testing a secondary battery includes first to fourth steps. At the first step, the secondary battery after manufacture is charged to a first voltage. At the second step, a second voltage lower than the first voltage is set as a target voltage and discharge or charge is performed in a constant-current constant-voltage mode before the secondary battery is left standing. At the third step, the open circuit voltage of the secondary battery is measured before and after the secondary battery is left standing. At the fourth step, it is determined whether the secondary battery is a conforming item or not based on the difference in the open circuit voltage before and after the secondary battery is left standing.Type: ApplicationFiled: March 2, 2011Publication date: December 12, 2013Inventors: Katsuyuki Hojo, Hisanao Kojima, Hiroaki Ikeda, Hisataka Fujimaki
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Patent number: 8549927Abstract: Provided is a device to sense battery internal state that can sense tiny elastic waves accompanying a reaction inside a battery and can accurately ascertain changes in battery internal state. The device (10) to sense the internal state of a battery (1) comprises restraining members (5, 5) that apply compressive force to the battery (1), a non-metallic plate (11) disposed between the battery (1) and a restraining member (5), and multiple acoustic emission sensors (13) affixed to the non-metallic plate (11). Compressive force is applied to the battery (1) by the restraining members (5, 5), elastic waves (W) generated in the battery (1) are sensed by the multiple acoustic emission sensors (13), and the internal state of the battery (1) is sensed by analyzing the sensed elastic waves (W).Type: GrantFiled: December 27, 2011Date of Patent: October 8, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventor: Katsuyuki Hojo
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Publication number: 20130255075Abstract: Provided is a method for producing a lithium secondary cell with which the concentrated precipitation of metal impurities at the negative electrode is inhibited and short circuiting is unlikely to occur. The production method includes, assembling together the positive electrode, the separator, and the negative electrode, and then impregnating the assembly with the nonaqueous electrolyte; charging the assembly within 1 min so that a maximum achieved potential of the positive electrode becomes 3.2 V or more with respect to the redox potential of lithium; allowing the assembly to stand for 10 min or less after the charging has ended; and discharging the assembly within 1 min after the standing step.Type: ApplicationFiled: December 17, 2010Publication date: October 3, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hisataka Fujimaki, Katsuyuki Hojo, Tomotaka Hagino, HIroyuki Kawaki, Shinya Kamada, Hisanao Kojima
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Publication number: 20120321926Abstract: To melt and diffuse metallic foreign bodies immixed in electrodes of a nonaqueous electrolyte secondary battery before initial charging, electrodes (18) wound with a separator (24) between a cathode plate (20) and an anode plate (22) are placed in a battery case (16) and the battery case (16) is filled with an electrolyte. After the case has been filled, the electrolyte is allowed to permeate into the electrodes (S14). Then, the electrolyte-filled battery (14) is placed in a processing device (10), and fixed by means of a surface pressure between at least 0.1 MPa and 5.0 MPa (S16). Thereafter, the cathode potential is adjusted and held for a period of one hour and 35 hours (S18) while the battery remains fixed, after which the pre-initial charging process is terminated (S20).Type: ApplicationFiled: March 8, 2010Publication date: December 20, 2012Applicant: TONGJI UNIVERSITYInventor: Katsuyuki Hojo
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Publication number: 20120090402Abstract: Provided is a device to sense battery internal state that can sense tiny elastic waves accompanying a reaction inside a battery and can accurately ascertain changes in battery internal state. The device (10) to sense the internal state of a battery (1) comprises restraining members (5, 5) that apply compressive force to the battery (1), a non-metallic plate (11) disposed between the battery (1) and a restraining member (5), and multiple acoustic emission sensors (13) affixed to the non-metallic plate (11). Compressive force is applied to the battery (1) by the restraining members (5, 5), elastic waves (W) generated in the battery (1) are sensed by the multiple acoustic emission sensors (13), and the internal state of the battery (1) is sensed by analyzing the sensed elastic waves (W).Type: ApplicationFiled: December 27, 2011Publication date: April 19, 2012Inventor: Katsuyuki HOJO
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Patent number: 7743679Abstract: A power transmission device that can have deformation in processing suppressed. A spiral gear as a rotation member includes a disk section extending radially outwards from a boss section. The disk section includes a through hole in slit form through laser processing.Type: GrantFiled: February 22, 2006Date of Patent: June 29, 2010Assignee: Toyota Jidosha Kabushiki KaishaInventors: Shigetsugu Iwata, Kenji Miyasaka, Katsuyuki Hojo, Yuichi Nishida, Hiroshi Mizoguchi, Naoki Kato, Hiroki Goshima
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Patent number: 7726884Abstract: A differential device includes a differential case which is supported in a housing so as to be rotatable around an axis of the housing by a conical roller bearing including plural conical rollers provided between an outer race and an inner race. In the differential device, a wave spring having a predetermined elastic force is provided between the outer race and the housing. Also, the differential device includes a stopper mechanism which stops movement of the outer race before the wave spring is completely contracted due to movement of the outer race in an axial direction.Type: GrantFiled: September 29, 2005Date of Patent: June 1, 2010Assignee: Toyota Jidosha Kabushiki KaishaInventor: Katsuyuki Hojo
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Publication number: 20090042655Abstract: A power transmission device that can have deformation in processing suppressed. A spiral gear as a rotation member includes a disk section extending radially outwards from a boss section. The disk section includes a through hole in slit form through laser processing.Type: ApplicationFiled: February 22, 2006Publication date: February 12, 2009Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shigetsugu Iwata, Kenji Miyasaka, Katsuyuki Hojo, Yuichi Nishida, Hiroshi Mizoguchi, Naoki Kato, Hiroki Goshima
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Publication number: 20060098909Abstract: A differential device includes a differential case which is supported in a housing so as to be rotatable around an axis of the housing by a conical roller bearing including plural conical rollers provided between an outer race and an inner race. In the differential device, a wave spring having a predetermined elastic force is provided between the outer race and the housing. Also, the differential device includes a stopper mechanism which stops movement of the outer race before the wave spring is completely contracted due to movement of the outer race in an axial direction.Type: ApplicationFiled: September 29, 2005Publication date: May 11, 2006Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Katsuyuki Hojo