Toyota Jidosha Kabushiki Kaisha

Ryo Kanada

Kenji Takahashi

Mai Fujiwara

Takanori Soejima

Hiroki Nagai

Nobuyasu Haga

Hiroshi Hamaguchi

Keiichiro Kobayashi

Shohei Matsuoka

Koji Umemura

Akemi Nakatake

Masahiko Ushizawa

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.

Diagnostic device for secondary battery and recovery method for secondary battery

A recovery method for a secondary battery having a structure in which positive electrodes and negative electrodes are laminated. The recovery method includes a first compression for compressing at least a part of the secondary battery; a second compression for compressing the secondary battery by applying a load from an outside of the secondary battery when an amount of decrease in electrical resistance of the secondary battery by the first compression is greater than a predetermined value; and a recovery for charging the secondary battery, while the load that compresses the secondary battery is applied to the secondary battery, upon determining that the increase in electrical resistance due to the distortion of at least one of the positive electrodes and the negative electrodes occurs in the secondary battery.

A method for charging a battery that is a non-aqueous electrolyte secondary battery includes first and second steps. The first step is estimating an SOC of the battery based on at least one of a voltage and a current of the battery. The second step is, based on a relationship between the SOC of the battery and an entropy change &#x394;S, determining a maximum charging current to the battery in accordance with the SOC of the battery such that the maximum charging current becomes larger as the entropy change of the battery becomes greater.

Method for charging battery and charging system

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.

Diagnostic apparatus for secondary battery and SOC unevenness detection method

A method of estimating a deteriorated state of a battery includes steps Sto SSis a step of obtaining a voltage and a current of the battery a plurality of times for a data acquisition period. Sis a step of calculating an amount of change in current, an amount of change in temperature, and an amount of change in SOC during the data acquisition period. Sis a step of obtaining an allowable amount of change in current, an allowable amount of change in temperature, and an allowable amount of change in SOC based on an average temperature. Sis a step of calculating an impedance component for each frequency bandwidth based on the voltage and the current by subjecting the voltage and the current to Fourier transform when all amounts of change are smaller than the allowable amounts of change.

Method of estimating deteriorated state of secondary battery and secondary battery system

A battery system includes a battery pack including a plurality of cells, and an ECU. The ECU calculates a current distribution in each cell using a ladder circuit network model, the ladder circuit network model being obtained by geometrically modeling an interior of the cell using a plurality of resistance elements and a plurality of power storage elements. The ECU calculates the current distribution in the cell by applying, to the ladder circuit network model, a resistance distribution in the cell calculated based on a salt concentration distribution in the cell.

Battery system, vehicle, and method for controlling charge and discharge of a secondary battery

The first step includes performing FFT for a voltage and a current of a battery a plurality of times to thereby calculate the voltage and the current for each frequency. The second step includes determining whether or not the first condition and the second condition are satisfied for the current of the battery that is calculated for each frequency. The third step includes calculating an impedance component of the battery for each frequency range when at least one of the first condition and the second condition is not satisfied, and not calculating the impedance component of the battery for each frequency range when each of the first condition and the second condition is satisfied. The first condition shows that the current in a low frequency range is greater than a reference value. The second condition shows that the current in a frequency range is less than a reference value.

Method of estimating deterioration state of secondary battery and secondary battery system

A controller of a deterioration estimation device for a secondary battery is configured to acquire a first open circuit voltage when a temperature of the secondary battery is a first temperature and a second open circuit voltage when the temperature of the secondary battery is a second temperature changed from the first temperature, and estimate a degree of deterioration of the secondary battery by using a difference between first and second slopes. The first slope is a ratio of a voltage change obtained by subtracting the first open circuit voltage from the second open circuit voltage to a temperature change obtained by subtracting the first temperature from the second temperature. The second slope is a ratio of the voltage change to the temperature change when the temperature of the new secondary battery has changed from the first temperature to the second temperature.

Deterioration estimation device for secondary battery, and deterioration estimation method for secondary battery

A control device calculates an amount of increase &#x394;Am in freezing temperature measurement value Am from an initial freezing temperature &#x394;and calculates an amount of lowering in capacity corresponding to the amount of increase &#x394;Am in freezing temperature as an amount of lowering in capacity &#x394;Bx due to deterioration of a material. The control device calculates an amount of lowering in capacity measurement value Bm from an initial capacity Bas a whole amount of lowering in capacity &#x394;Bm and calculates a material deterioration ratio X by using &#x394;Bx and &#x394;Bm. The control device calculates a value resulting from subtraction of &#x394;Bx from &#x394;Bm as an amount of lowering in capacity &#x394;By due to precipitation of Li and calculates an Li precipitation deterioration ratio Y by using &#x394;By and &#x394;Bm.

Apparatus and method of estimating state of lithium ion battery

The present invention provides a battery pack in which a plurality of unit cells and one or a plurality of spacers are alternately arranged in a predetermined arrangement direction and a load is applied in the arrangement direction. The unit cell includes an electrode body having a reaction section, and a battery case having long side surfaces. The spacer includes, on a surface facing the unit cell, a first pressing portion that presses a part of the reaction section. The first pressing portion is configured to press each of the center portion and a pair of end portions of the reaction section in a width direction over the entire length in a vertical direction, and not to press a lower region, which is &#x2153; of the reaction section from the lower end in the vertical direction, over a length of &#xbd; or more in the width direction.

Battery pack

A battery control device includes a positional information acquiring unit, a deposition-risk-geographic-point storing unit, a determination unit, and a deposition-deterring-mode executing unit. The positional information acquiring unit is a processing unit that acquires positional information of a vehicle. The deposition-risk-geographic-point storing unit stores deposition risk geographic points. The determination unit determines whether or not the vehicle passes at least one of the deposition risk geographic points stored in the deposition-risk-geographic-point storing unit based on the positional information of the vehicle that is acquired by the positional information acquiring unit. The deposition-deterring-mode executing unit controls a battery based on a predetermined deposition-deterring mode, if the determination unit determines that the vehicle passes the at least one of the deposition risk geographic points.

Battery control device and battery control system

A vehicle includes a control device including a first processing section, a second processing section, and a third processing section. The first processing section is programmed to acquire an excessive processing power of a general purpose computing device. The second processing section is programmed to cause the general purpose computing device to process a computing task stored in a first memory storage section and allow the processing result to be stored in a second memory storage section if the excessive processing power acquired by the first processing section is greater than a predetermined processing power. The third processing section is programmed to send the processing result stored in the second memory storage section to an external server by use of a communication device.

Vehicle and computing system

A battery management terminal is for a secondary battery mounted on a device. The battery management terminal includes a second electronic control unit and an inform unit. The second electronic control unit is configured to, at the time when the secondary battery is replaced, acquire a historical information of an evaluation value of the secondary battery before replacement from the first electronic control unit. The second electronic control unit is configured to determine required characteristics required of a replacement secondary battery on the basis of the historical information of the evaluation value. The inform unit is configured to inform the required characteristics determined by the second electronic control unit.

Battery management terminal and battery management system

A battery system is configured to be mounted on a vehicle. The battery system includes a secondary battery, a detection device, and an electronic control unit. The electronic control unit is configured to perform communication with an external device that accumulates temperature history data of other vehicle, and is configured to acquire, when the battery temperature of the temperature history data of the vehicle contains an abnormal value, the temperature history data of the other vehicle within a period in which the battery temperature of the temperature history data of the vehicle contains the abnormal value, from the external device, and execute correction of the abnormal value of the battery temperature based on the temperature history data acquired from the external device.

Growing community of inventors

Toyota, Japan

Ryo Kanada