公开(公告)号：US20190178952A1

公开(公告)日：2019-06-13

申请号：US16214530

申请日：2018-12-10

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kenji TAKAHASHI

IPC: G01R31/3842 ,  G01R31/36

Abstract: If a charging quantity charged to a battery pack since switching from discharging to charging is more than or equal to a reference charging quantity, an ECU estimates the SOC from the OCV by referring to a charging OCV. If a discharging quantity discharged from the battery pack since switching from charging to discharging is more than or equal to a reference discharging quantity, the ECU estimates the SOC from the OCV by referring to a discharging OCV. If the electric quantity is less than the reference charging quantity or if the electric quantity is more than the reference discharging quantity, the ECU estimates the SOC from the OCV using a straight line for supplementing SOC-OCV characteristics in a region enclosed by the charging OCV and the discharging OCV.

公开(公告)号：US20190178948A1

公开(公告)日：2019-06-13

申请号：US16157320

申请日：2018-10-11

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kenji TAKAHASHI

IPC: G01R31/36

Abstract: A secondary battery system includes: a secondary battery having an electrode containing an active material; and an electronic control unit configured to execute an SOC estimation process of estimating an SOC of the secondary battery. The electronic control unit is configured to: i) calculate the surface stress from a use history of the secondary battery; ii) calculate the amount of change in OCV from the calculated surface stress iii) correct an estimated OCV with the use of the amount of change in OCV; the estimated OCV being estimated from a voltage value and current value of the secondary battery; and iv) estimate an SOC corresponding to the corrected estimated OCV as the SOC of the secondary battery.

公开(公告)号：US20210234206A1

公开(公告)日：2021-07-29

申请号：US17087758

申请日：2020-11-03

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Ryo KANADA ,  Kenji TAKAHASHI

IPC: H01M10/48 ,  G01R31/392 ,  G01R31/3828 ,  H02J7/00 ,  H01M10/0525

Abstract: A diagnostic apparatus for a secondary battery includes a control device. The control device acquires an electricity storage amount that is the amount of electricity stored in the secondary battery, and V/K indicating the magnitude of change in OCV of the secondary battery with respect to temperature change of the secondary battery. The control device determines whether or not an SOC unevenness occurs in an electrode surface of the secondary battery by using the acquired electricity storage amount and V/K.

公开(公告)号：US20180313906A1

公开(公告)日：2018-11-01

申请号：US15963579

申请日：2018-04-26

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kenji TAKAHASHI ,  Kazushi AKAMATSU ,  Kiyohito MACHIDA

IPC: G01R31/36

Abstract: A battery system includes: a battery; a voltage detector that detects a voltage of the battery as a detected voltage value; a current detector that detects a current flowing through the battery as a detected current value; and an electronic control unit. The electronic control unit is configured to estimate an aging deterioration of the battery based on an open circuit voltage value that is calculated from the detected voltage value and an integrated current value that is calculated from the detected current value, and estimate the aging deterioration of the battery based on the open circuit voltage value and the integrated current value that are calculated when a charge level of the battery is in the non-hysteresis region.

公开(公告)号：US20190181510A1

公开(公告)日：2019-06-13

申请号：US16193463

申请日：2018-11-16

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kenji TAKAHASHI

IPC: H01M10/48

Abstract: A secondary battery system includes an electronic control unit (ECU) that estimates surface stress generated in a negative-electrode active material upon incorporation or removal of lithium in a negative electrode of a battery assembly. The ECU calculates an estimated value of the surface stress from a difference obtained by subtracting a reference lithium amount from an amount of lithium contained in the negative-electrode active material, using a linear relationship between the difference and the surface stress. The ECU sets the surface stress to yield stress when the magnitude of the estimated value is larger than that of the yield stress (compressive stress or tensile stress) of the active material, and employs the estimated value as the surface stress when the magnitude of the estimated value is smaller than that of the yield stress.

公开(公告)号：US20190074553A1

公开(公告)日：2019-03-07

申请号：US16101579

申请日：2018-08-13

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kenji TAKAHASHI ,  Hiroyuki KAIYA

IPC: H01M10/42 ,  H01M10/48 ,  H01M4/32 ,  H01M10/30 ,  H02J7/00

Abstract: A method of recycling a battery pack includes first to third steps. The first step is a step of estimating an amount of generation of Ni2O3H in a positive electrode of the battery pack based on a voltage value and a temperature of the battery pack. The second step is a step of recycling the battery pack for a high-capacity application when the estimated amount of generation is equal to or smaller than a prescribed reference amount. The third step is a step of recycling the battery pack for a high input-and-output application when the estimated amount of generation is greater than the reference amount and not greater than a reference amount.

公开(公告)号：US20170356962A1

公开(公告)日：2017-12-14

申请号：US15617412

申请日：2017-06-08

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kenji TAKAHASHI ,  Masafumi NOSE ,  Yuji NISHI ,  Nobuyasu HAGA

IPC: G01R31/36 ,  H01M4/52 ,  H01M10/34 ,  H01M10/48 ,  H01M4/38 ,  H01M10/42

CPC classification number: G01R31/3835 ,  G01R31/3648 ,  G01R31/367 ,  G01R31/374 ,  H01M4/383 ,  H01M4/52 ,  H01M10/345 ,  H01M10/486 ,  H01M2010/4271 ,  H01M2220/20 ,  H01M2300/0014

Abstract: A battery system includes a nickel hydride battery and an electronic control unit. The electronic control unit is configured to store data indicating a corresponding relationship between an elapsed time from start of use of the nickel hydride battery and a memory quantity. The data are data determined in a classified manner individually for each of conditions of use that are defined in such a manner as to include an open circuit voltage and a temperature. The electronic control unit is configured to sequentially calculate, with reference to the data, the memory quantity within a time when classification of the conditions of use does not change. The memory quantity is a quantity indicating an amount of change in voltage resulting from a memory effect. The electronic control unit is configured to estimate a current memory quantity of the nickel hydride battery by integrating the calculated memory quantity.

公开(公告)号：US20230378560A1

公开(公告)日：2023-11-23

申请号：US18360165

申请日：2023-07-27

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Ryo KANADA ,  Kenji TAKAHASHI ,  Mai FUJIWARA

IPC: H01M10/48 ,  H01M4/133 ,  G01R31/382 ,  H01M10/0587 ,  H01M4/134 ,  H01M10/0525 ,  H01M10/44

CPC classification number: H01M10/48 ,  H01M4/133 ,  G01R31/382 ,  H01M10/0587 ,  H01M4/134 ,  H01M10/0525 ,  H01M10/44

Abstract: A diagnostic device for a secondary battery having a structure in which positive electrodes and negative electrodes are alternately arranged includes an electronic control unit. The electronic control unit is configured to acquire a first resistance value indicating a magnitude of electrical resistance of the secondary battery, compress at least a part of the secondary battery, acquire a second resistance value indicating a magnitude of electrical resistance of the secondary battery after the compression, determine, using the first and second resistance values, whether an amount of decrease in electrical resistance of the secondary battery by the compression is greater than a predetermined value, and determine whether an increase in resistance due to distortion of at least one of the positive electrodes and the negative electrodes occurs in the secondary battery using a result of the determination.

公开(公告)号：US20160052419A1

公开(公告)日：2016-02-25

申请号：US14783268

申请日：2013-04-11

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kenji TAKAHASHI ,  Hiroyuki KAIYA ,  Chihaya TODOROKI

IPC: B60L11/18 ,  H01M10/42 ,  H01M10/48 ,  H01M10/0525

CPC classification number: B60L11/1861 ,  G01R31/3651 ,  H01M10/052 ,  H01M10/0525 ,  H01M10/425 ,  H01M10/48 ,  H01M2010/4278 ,  H01M2220/20 ,  H02J7/0052 ,  Y02T10/7011

Abstract: [Task] To accurately estimate a distribution of concentration of lithium in an active material.[Means for Solution] A battery system has a lithium-ion secondary battery (1) and a controller (300). The lithium-ion secondary battery (1) employs a two-phase coexistence type positive electrode active material (141b). The controller (300) calculates a distribution of concentration of lithium in an active material (141b, 142b) of the lithium-ion secondary battery, through the use of a diffusion equation in which a boundary condition is set. The controller corrects a diffusion coefficient that is used in the diffusion equation, in accordance with history data indicating a charge/discharge state of the lithium-ion secondary battery to the present time.

Abstract translation: [任务]精确估计活性物质中锂的浓度分布。 解决方案电池系统具有锂离子二次电池（1）和控制器（300）。 锂离子二次电池（1）采用两相共存型正极活性物质（141b）。 控制器（300）通过使用设定了边界条件的扩散方程来计算锂离子二次电池的活性物质（141b，142b）中锂的浓度分布。 控制器根据表示目前锂离子二次电池的充电/放电状态的历史数据来校正扩散方程中所使用的扩散系数。

公开(公告)号：US20180313905A1

公开(公告)日：2018-11-01

申请号：US15963531

申请日：2018-04-26

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kenji TAKAHASHI

IPC: G01R31/36

Abstract: A method for estimating a state of charge of a battery includes: estimating, by an electronic control unit, a third state of charge used for control of the battery based on a first state of charge and a second state of charge, the first state of charge being a state of charge estimated with reference to an electric current integrated value obtained by integrating detected electric current values of the battery, the second state of charge being a state of charge estimated with reference to a detected voltage value of the battery; and correcting, by the electronic control unit, the first state of charge based on the second state of charge estimated when the state of charge of the battery is in the non-hysteresis region.