Patents by Inventor Norito Yamabe
Norito Yamabe 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: 8148993Abstract: An abnormality of a current sensor or a voltage sensor is detected. An abnormality detecting section reads out a charging/discharging current I of a secondary battery detected by the current sensor and a battery voltage V of the secondary battery, calculates an estimated battery voltage Vs on the basis of an electromotive force E and an internal resistance r of the secondary battery, and judges the current sensor to be abnormal if the difference between the battery voltage V and the estimated battery voltage Vs is greater than a predetermined threshold and the charging/discharging current I exceeds a predetermined allowable range, and judges the voltage sensor to be abnormal if the difference is greater than the predetermined threshold and the charging/discharging current I is within the predetermined allowable range.Type: GrantFiled: November 20, 2007Date of Patent: April 3, 2012Assignee: Panasonic EV Energy Co., Ltd.Inventors: Norito Yamabe, Kouta Togashi
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Patent number: 8039137Abstract: In a battery cooling device for cooling a battery with air from a cooling unit, such as a cooling fan, the air flow of the cooling unit is optimally controlled. A air flow control device calculates a calorific value of the battery based on an internal resistance of the battery and a charge/discharge current measured by a current measurement unit, calculates the difference as a differential temperature between battery temperature measured by a battery temperature measurement unit and ambient temperature measured by an ambient temperature measurement unit, and controls the air flow of the cooling fan on the basis of the calculated calorific value and the differential temperature.Type: GrantFiled: June 11, 2007Date of Patent: October 18, 2011Assignee: Panasonic EV Energy Co., Ltd.Inventors: Takao Yamamoto, Norito Yamabe
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Patent number: 8039136Abstract: In a battery cooling device for cooling a battery with cooling air from a cooling unit, such as a cooling fan, the cooling fan is not to be driven more than necessary. A cooling air flow control unit calculates a battery temperature change rate indicating an amount of change in battery temperature over a predetermined time based on the battery temperature, and if the calculated battery temperature change rate satisfies a predetermined suppression control condition, the cooling air flow of the cooling fan is suppressed regardless of whether or not the battery temperature is at or below a reference temperature.Type: GrantFiled: June 11, 2007Date of Patent: October 18, 2011Assignee: Panasonic EV Energy Co., Ltd.Inventors: Takao Yamamoto, Norito Yamabe
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Patent number: 7999553Abstract: To provide a voltage measurement device for measuring a battery voltage of a secondary battery formed by serially connecting a plurality of battery blocks, which is able to calculate the battery voltage in block units even though a potential detection line is disconnected. Specifically, when the voltage detection unit fails to measure the battery voltage of the measurement target battery block by selecting potential detection lines connected to both terminals of the measurement target battery block, the switch control unit selects the potential detection lines connected to both terminals of the battery block group including a serially connected plurality of battery blocks including the measurement target battery block, then measures the integrated voltage of the battery block group, and measures the battery voltage of the measurement target battery block based on the measured integrated voltage.Type: GrantFiled: November 9, 2007Date of Patent: August 16, 2011Assignee: Panasonic EV Energy Co., Ltd.Inventor: Norito Yamabe
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Patent number: 7965060Abstract: A device for appropriately controlling capacitive variations between battery blocks. A voltage measurement section periodically measures a terminal voltage of each battery block by way of respective potential detection lines electrically connected to both terminals of the respective battery blocks. A discharge section effects electric discharge of each battery block by electrically connecting both terminals of a discharge element to both terminals of the respective battery blocks by way of the potential detection line.Type: GrantFiled: January 4, 2008Date of Patent: June 21, 2011Assignee: Panasonic EV Energy Co., Ltd.Inventor: Norito Yamabe
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Patent number: 7750640Abstract: Error in an electromotive force Ve of a secondary battery calculated on the basis of a polarized voltage Vp is reduced.Type: GrantFiled: December 19, 2007Date of Patent: July 6, 2010Assignee: Panasonic EV Energy Co., Ltd.Inventor: Norito Yamabe
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Patent number: 7728598Abstract: An apparatus estimates charge/discharge electricity amount without being affected by current measurement error. Under specific selection conditions, a no-load voltage calculation part uses pairs of data consisting of current data I(n) and voltage data V(n) corresponding to the current data to calculate a no-load voltage Vsep as the voltage intercept at a current of zero in a straight-line approximation obtained by statistical processing such as regression analysis using a least squares method. If specific current conditions exist for a certain amount of time, an open circuit voltage calculation part calculates the terminal voltage of the secondary battery as the open circuit voltage Voc.Type: GrantFiled: June 4, 2009Date of Patent: June 1, 2010Assignee: Panasonic EV Energy Co., Ltd.Inventors: Yusai Murakami, Norito Yamabe
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Publication number: 20090261836Abstract: An apparatus estimates charge/discharge electricity amount without being affected by current measurement error. Under specific selection conditions, a no-load voltage calculation part uses pairs of data consisting of current data I(n) and voltage data V(n) corresponding to the current data to calculate a no-load voltage Vsep as the voltage intercept at a current of zero in a straight-line approximation obtained by statistical processing such as regression analysis using a least squares method. If specific current conditions exist for a certain amount of time, an open circuit voltage calculation part calculates the terminal voltage of the secondary battery as the open circuit voltage Voc.Type: ApplicationFiled: June 4, 2009Publication date: October 22, 2009Applicant: PANASONIC EV ENERGY CO., LTD.Inventors: Yusai MURAKAMI, Norito YAMABE
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Patent number: 7557584Abstract: The present invention provides an apparatus that can estimate the charge/discharge electricity amount without being affected by current measurement error. If specific selection conditions are met, a no-load voltage calculation part (105) takes a plurality of pairs of data consisting of current data I(n) and voltage data V(n) corresponding to the current data and calculates a no-load voltage Vsep as the voltage intercept at a current of zero in a straight-line approximation obtained by statistical processing such as regression analysis using a least squares method with respect to the plurality of pairs of data. In addition, if specific current conditions continue to be met for a certain amount of time, an open circuit voltage calculation part (106) calculates the terminal voltage of the secondary battery as the open circuit voltage Voc.Type: GrantFiled: July 26, 2004Date of Patent: July 7, 2009Assignee: Panasonic EV Energy Co., Ltd.Inventors: Yusai Murakami, Norito Yamabe
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Patent number: 7528575Abstract: The present invention provides an apparatus for correcting a voltage of a secondary battery, wherein accuracy in measurement of battery voltages between battery blocks in different voltage measurement systems.Type: GrantFiled: April 19, 2004Date of Patent: May 5, 2009Assignee: Panasonic EV Energy Co., Ltd.Inventors: Yusai Murakami, Norito Yamabe
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Publication number: 20080202830Abstract: To provide a voltage measurement device for measuring a battery voltage of a secondary battery formed by serially connecting a plurality of battery blocks, which is able to calculate the battery voltage in block units even though a potential detection line is disconnected. Specifically, when the voltage detection unit fails to measure the battery voltage of the measurement target battery block by selecting potential detection lines connected to both terminals of the measurement target battery block, the switch control unit selects the potential detection lines connected to both terminals of the battery block group including a serially connected plurality of battery blocks including the measurement target battery block, then measures the integrated voltage of the battery block group, and measures the battery voltage of the measurement target battery block based on the measured integrated voltage.Type: ApplicationFiled: November 9, 2007Publication date: August 28, 2008Applicant: PANASONIC EV ENERGY CO., LTD.Inventor: Norito Yamabe
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Publication number: 20080169789Abstract: A device for appropriately controlling capacitive variations between battery blocks. A voltage measurement section periodically measures a terminal voltage of each battery block by way of respective potential detection lines electrically connected to both terminals of the respective battery blocks. A discharge section effects electric discharge of each battery block by electrically connecting both terminals of a discharge element to both terminals of the respective battery blocks by way of the potential detection line.Type: ApplicationFiled: January 4, 2008Publication date: July 17, 2008Applicant: PANASONIC EV ENERGY CO., LTD.Inventor: Norito Yamabe
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Publication number: 20080157777Abstract: Error in an electromotive force Ve of a secondary battery calculated on the basis of a polarized voltage Vp is reduced.Type: ApplicationFiled: December 19, 2007Publication date: July 3, 2008Applicant: PANASONIC EV ENERGY CO., LTD.Inventor: Norito Yamabe
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Publication number: 20080125932Abstract: An abnormality of a current sensor or a voltage sensor is detected. An abnormality detecting section reads out a charging/discharging current I of a secondary battery detected by the current sensor and a battery voltage V of the secondary battery, calculates an estimated battery voltage Vs on the basis of an electromotive force E and an internal resistance r of the secondary battery, and judges the current sensor to be abnormal if the difference between the battery voltage V and the estimated battery voltage Vs is greater than a predetermined threshold and the charging/discharging current I exceeds a predetermined allowable range, and judges the voltage sensor to be abnormal if the difference is greater than the predetermined threshold and the charging/discharging current I is within the predetermined allowable range.Type: ApplicationFiled: November 20, 2007Publication date: May 29, 2008Applicant: PANASONIC EV ENERGY CO., LTD.Inventors: Norito Yamabe, Kouta Togashi
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Patent number: 7355411Abstract: When a power switch portion 10 is in an open state and a charge/discharge path of the secondary battery 100 is in a disconnected state, an electromotive force calculation portion 109 calculates a battery electromotive force Veq by subtracting a polarized voltage Vpol stored in a polarized voltage storage portion 113 from an open-circuit voltage OCV measured by a voltage measurement portion 102. Based on the electromotive force, a state-of-charge estimation portion 110 estimates a state of charge SOC. Thus, a polarized voltage to be considered for the estimation of SOC can be limited. The state of charge (SOC) of a secondary battery can be estimated with high accuracy and quickly.Type: GrantFiled: September 29, 2004Date of Patent: April 8, 2008Assignee: Panasonic EV Energy Co., Ltd.Inventors: Yusai Murakami, Norito Yamabe, Keiichi Minamiura, Tadao Kimura
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Patent number: 7339351Abstract: There is provided a battery pack system with estimation accuracy of a remaining capacity of a secondary batter enhanced. A current accumulation coefficient correction section 109 calculates a correction amount ? with respect to a current accumulation coefficient k in accordance with a battery electromotive force Veq from an electromotive force calculation section 105. A remaining capacity calculation section 112 estimates a remaining capacity SOC by current accumulation, based on the current accumulation coefficient k calculated from a correction amount ?, and a charging efficiency ? based on a currently estimated remaining capacity calculated by a charging efficiency calculation section 110.Type: GrantFiled: December 2, 2002Date of Patent: March 4, 2008Assignee: Panasonic EV Energy Co., Ltd.Inventors: Yusai Murakami, Masahiro Takada, Teruyoshi Egoshi, Norito Yamabe
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Publication number: 20070298316Abstract: In a battery cooling device for cooling a battery with air from a cooling unit, such as a cooling fan, the air flow of the cooling unit is optimally controlled. A air flow control device calculates a calorific value of the battery based on an internal resistance of the battery and a charge/discharge current measured by a current measurement unit, calculates the difference as a differential temperature between battery temperature measured by a battery temperature measurement unit and ambient temperature measured by an ambient temperature measurement unit, and controls the air flow of the cooling fan on the basis of the calculated calorific value and the differential temperature.Type: ApplicationFiled: June 11, 2007Publication date: December 27, 2007Applicant: Panasonic EV Energy Co., Ltd.Inventors: Takao Yamamoto, Norito Yamabe
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Publication number: 20070298315Abstract: In a battery cooling device for cooling a battery with cooling air from a cooling unit, such as a cooling fan, the cooling fan is not to be driven more than necessary. A cooling air flow control unit calculates a battery temperature change rate indicating an amount of change in battery temperature over a predetermined time based on the battery temperature, and if the calculated battery temperature change rate satisfies a predetermined suppression control condition, the cooling air flow of the cooling fan is suppressed regardless of whether or not the battery temperature is at or below a reference temperature.Type: ApplicationFiled: June 11, 2007Publication date: December 27, 2007Applicant: Panasonic EV Energy Co., Ltd.Inventors: Takao Yamamoto, Norito Yamabe
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Publication number: 20060273802Abstract: The present invention provides an apparatus for correcting a voltage of a secondary battery, wherein accuracy in measurement of battery voltages between battery blocks in different voltage measurement systems.Type: ApplicationFiled: April 19, 2004Publication date: December 7, 2006Applicant: PANASONIC EV ENERGY CO., LTD.Inventors: Yusai Murakami, Norito Yamabe
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Publication number: 20060232277Abstract: The present invention provides an apparatus that can estimate the charge/discharge electricity amount without being affected by current measurement error. If specific selection conditions are met, a no-load voltage calculation part (105) takes a plurality of pairs of data consisting of current data I(n) and voltage data V(n) corresponding to the current data and calculates a no-load voltage Vsep as the voltage intercept at a current of zero in a straight-line approximation obtained by statistical processing such as regression analysis using a least squares method with respect to the plurality of pairs of data. In addition, if specific current conditions continue to be met for a certain amount of time, an open circuit voltage calculation part (106) calculates the terminal voltage of the secondary battery as the open circuit voltage Voc.Type: ApplicationFiled: July 26, 2004Publication date: October 19, 2006Applicant: PANASONIC EV ENERGY CO., LTD.Inventors: Yusai Murakami, Norito Yamabe