Mitsubishi Electric Corporation

Japan Aerospace Exploration Agency

Mitsubishi Electric Research Laboratories, Inc.

Tomoki Takegami

Toshihiro Wada

Hiroshi Kobayashi

Akihiko Iwata

Tetsuya Kojima

Kenji Fujiwara

Satoshi Hara

Hisatoshi Fukumoto

Akira Nishizawa

Masahiro Sugahara

Mari Nishiyama

Zafer Sahinoglu

Sadayuki Inoue

Shigeru Aihara

Yebin Wang

Makiko Kise

Yuruki Okada

Sho Shiraga

Yukihiro Yoshida

Hiroto Nishiguchi

Keisuke Ogasawara

Takahito Ida

Shoichi Kobayashi

Seiji Hirai

Seigo Kadota

Taesic Kim

After the temperature of a battery rises to a predetermined diagnosis temperature, a charge/discharge control unit controls a charge/discharge circuit to charge or discharge the battery. A current-voltage detection unit detects current and voltage of the battery during a period in which the battery is charged or discharged. A differential voltage calculation unit calculates a differential voltage of the battery on the basis of the detected current and voltage. A deterioration state estimation unit estimates a deterioration state of the battery on the basis of a change in the calculated differential voltage.

Battery deterioration diagnosis device and battery deterioration diagnosis method

A charge and discharge control device includes a storage charge level determining unit that selects one range from a first charge level range lower than a second charge level range and a third charge level range higher than the second charge level range, and determines a charge level at storage during which charge and discharge of a battery are not performed. The second charge level range can be a range of charge level including a maximum value of storage degradation, and the storage degradation can be degradation of the battery over time. The charge and discharge control device can further comprise a charge and discharge control unit that controls charge and discharge of the battery on the basis of the charge level at storage.

Charge and discharge control device and charge and discharge control method including first, second, and third charge level ranges

A motor control device includes: a power source device including a DC-output power conversion device having a first mode for outputting first voltage and a second mode for outputting second voltage higher than the first voltage; a power supply device; and a control device, and controls a motor. When a flying object takes off, the control device controls the power conversion device in the second mode. When the control device judges that flight information which is one or both of information of a motor parameter obtained along with control for the motor and information of an environmental factor relevant to the flight altitude satisfies a predetermined condition, or when the control device has received an operation mode signal for which the first mode is selected on the basis of the flight information during control for the motor, the control device controls the power conversion device in the first mode.

Motor control device

Provided is a characteristic estimation device for a storage battery including: a voltage detection unit configured to detect a terminal voltage of the storage battery; a time-series data acquisition unit configured to acquire time-series data on the terminal voltage in a stopped state of the storage battery; a model provision unit configured to provide a storage battery model; and a model parameter estimation unit configured to estimate a model parameter of the storage battery model based on the time-series data on the terminal voltage acquired by the time-series data acquisition unit and on the storage battery model provided by the model provision unit. The storage battery model includes an OCV term for expressing OCV of the storage battery and an interparticle diffusion term which is based on a fundamental solution of a one-dimensional diffusion equation expressing ion diffusion among particles forming electrodes of the storage battery.

Characteristic estimation device for storage battery and characteristic estimation method for storage battery

A motor control device includes: a step-down device including a DC-output power conversion device having a first mode for outputting first voltage and a second mode for outputting second voltage lower than the first voltage; a power supply device; and a control device, and controls a motor. When a flying object takes off, the control device controls the power conversion device in the first mode. When the control device judges that flight information which is one or both of information of a motor parameter obtained along with control for the motor and information of an environmental factor relevant to the flight altitude of satisfies a predetermined condition, or when the control device has received an mode signal for which the second mode is selected on the basis of the flight information during control for the motor, the control device controls the power conversion device in the second mode.

A device for controlling a storage battery system is provided. The device includes: a state information calculator configured to calculate state information on each of batteries of a plurality of storage battery modules; a conversion efficiency characteristics calculator configured to calculate a power conversion efficiency of each of DC/DC converters of the plurality of storage battery modules; and a storage battery module selector configured to select one or a plurality of storage battery modules to be used while the storage battery system is charged or discharged and to determine a charge power or a discharge power of each of the selected storage battery modules, based on the state information of the batteries and the power conversion efficiencies of the DC/DC converters.

Device and method for controlling a storage battery system

Provided is a storage battery diagnostic device including: a positive/negative electrode OCV model function generation unit () configured to generate a positive electrode OCV model function and a negative electrode OCV model function for N storage batteries by a sum of OCV element functions; and a storage battery model function parameter group estimation unit (), which is configured to generate a storage battery model function based on the positive electrode OCV model function and the negative electrode OCV model function, and to generate an evaluation function L indicating an error between the time-series data stored in the data storage unit () and time-series data on estimation data calculated by using the storage battery model function, to thereby calculate such an optimal group of estimation parameters of the storage battery model functions for the respective storage batteries as to minimize a value of the evaluation function L.

Storage cell diagnostic device and storage cell diagnostic method, and storage cell control system

In response to demands for stably and precisely estimating states, a rechargeable battery state estimation device includes a current detecting unit which detects a charge-discharge current of the rechargeable battery as a detected current; a voltage detecting unit which detects a voltage between terminals of the rechargeable battery as a detected voltage; an OCV estimation method SOC estimation unit which calculates an OCV estimation method state of charge, based on the detected current and the detected voltage; a current integration method parameter estimation unit which estimates a current integration method parameter including a capacity retention rate, based on the detected current and the OCV estimation method state of charge; and a corrected SOC estimation unit which calculates an estimated state of charge, based on the detected current, the OCV estimation method state of charge, and the current integration method parameter.

Rechargeable battery state estimation device

A distributed equipment abnormality detection system is provided for monitoring physical amounts of equipments of identical type and detecting an abnormality of each equipment. The distributed equipment abnormality detection system includes equipment management apparatuses that manage the equipments; and a management server apparatus for communicating the equipment management apparatuses. Each equipment management apparatus includes a communication unit that communicates with the management server apparatus; a measurement unit that repeatedly measures the physical amount of the equipment; a distribution information generation unit that calculates distribution information from the measured physical amount; a distribution comparison unit that calculates a difference between the distribution information generated by the distribution information generation unit, and integrated distribution information on the entire equipments delivered from the management server apparatus; and an abnormality determination unit that determines whether or not the equipment is abnormal based on the calculated difference.

Distributed equipment abnormality detection system for monitoring physical amounts of equipments and detecting abnormality of each equipment

Battery cells are disposed apart from each other in a housing of a battery module included in a power storage device. In the battery module, a partition member is provided that divides a space in the housing into a high temperature region, which contains battery cells located centrally in a disposal direction of the battery cells, and a low temperature region, which contains battery cells located at end portions in the disposal direction of the battery cells. The cooling air flow supplied from a fan passes between the battery cells in the high temperature region, passes through ventilation holes provided in the partition members, enters the low temperature region, passes between the battery cells in the low temperature region, passes through a discharge hole, and flows outside of the housing.

Power storage device

Provided is a battery state estimation device configured to: calculate a first state of charge and a first open circuit voltage corresponding to the first state of charge by using a detection current output from a current detection unit and state-of-charge estimation parameters; calculate a second open circuit voltage and a second state of charge corresponding to the second open circuit voltage by using a detection voltage output from a voltage detection unit and equivalent circuit parameters; recursively estimate and update the state-of-charge estimation parameters by using a state-of-charge error, which is a value obtained by subtracting the first state of charge from the second state of charge; and recursively estimate and update the equivalent circuit parameters by using an open circuit voltage error, which is a value obtained by subtracting the first open circuit voltage from the second open circuit voltage.

Battery state estimation device

The rechargeable battery parameter estimation apparatus includes: a current measurement part for measuring a current flowing through a rechargeable battery, the current measurements having an offset error; a first coefficient calculation part for calculating a first coefficient, which is a partial derivative of an estimated value of an state of charge (SoC) of the battery with respect to the offset error; a second coefficient calculation part for calculating a second coefficient, which is a partial derivative of the estimated value of the SoC with respect to a capacity error, which is a difference of a typical full charge capacity from an actual full charge capacity of the battery; and an error estimation part for estimating the offset error and the capacity error from derivative information including the first coefficient and the second coefficient, the current flowing through the battery, and the estimated value of the SoC.

Rechargeable battery parameter estimation apparatus and rechargeable battery parameter estimation method for calculating first and second coefficients which are partial derivatives of an estimated value of the battery state-of-charge

The present invention provides a storage-battery control devicecapable of enhancing economical efficiency by controlling charge state of a storage batteryso that surplus power generated by photovoltaic generation can be entirely charged into the storage batteryeven in a case where power cannot be sold to a system power supply. A storage-battery control deviceaccording to the present invention includes a load-power prediction deviceto predict load power, a PV-power prediction deviceto predict generated power by photovoltaic power generation, and a system controllerto obtain a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segmenthaving a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment, and when the predicted charge amount is positive, to control the charge state of a storage batteryat the start point so that the predicted charge amount can be charged in the prediction segment, wherein an end point of the prediction segmentis a time at which the generated power by photovoltaic power generation is predicted to become equal to the load power after reaching the maximum value of the generated power.

Growing community of inventors

Chiyoda-ku, Japan

Tomoki Takegami