Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Sanyo Electric Co., Ltd.

Tomokazu Sada

Masaru Fuse

Satoshi Furusawa

Tsuyoshi Ikushima

Yukikazu Ohchi

Hiroshi Kanno

Tomoaki Ohira

Kazuya Hayayama

Hiroshi Yamamoto

Masatoshi Nagayama

Junichi Itoh

Shinya Nishikawa

Hajime Nishino

Takashi Iida

Kouichi Masuda

Shinichi Yuasa

Takao Yamamoto

Shin Haraguchi

Masaaki Takegata

Hiroshi Tenmyo

Hiroshi Tenmyou

In a calculation system, a data acquisition unit is configured to acquire operation data of a battery, the operation data including at least voltages and currents measured by a management device at a plurality of time points, and states of charge (SOCs) estimated based on at least one of the voltages and the currents, the management device being configured to manage the battery. An extraction unit is configured to, extract, as sample data, a set of an SOC and a voltage from sets of the SOCs and the voltages the plurality of time points included in the operation data in a period in which the battery is regarded as resting, the period being specified based on the currents. An estimation unit is configured to estimate an SOC-open circuit voltage (OCV) characteristic of the battery based on the extracted sample data.

Calculation system, battery characteristic estimation method, and battery characteristic estimation program

A deterioration diagnosis unitof an arithmetic unitconstituting a remaining performance evaluation systemdiagnoses the deterioration degree of a secondary batterythat has already been used for primary use based on an actual measurement value. The deterioration speed update unitupdates the deterioration speed of the secondary batterybased on the diagnosis result of the secondary battery. The remaining performance estimation unitestimates the remaining performance of the secondary batteryafter the start of secondary use based on the updated deterioration speed and a usage method at the time of the secondary use of the secondary battery

Remaining capability evaluation method for secondary battery, remaining capability evaluation program for secondary battery, computation device, and remaining capability evaluation system

A state estimator estimates, based on at least one of a voltage, a current, and a temperature of a secondary battery, a state of the secondary battery including a state of charge (SOC) of the secondary battery. A discharge controller discharges, when a state of non-use of the secondary battery lasts for a predetermined period of time, the secondary battery such that an indicator indicating easiness of storage deterioration of the secondary battery to progress decreases in stages. The indicator includes a parameter that depends on an SOC of the secondary battery. A value of the indicator and a duration of stay in each stage are set such that a predetermined relationship holds between products in a plurality of stages, each of the products being derived from multiplying the value of the indicator and the duration of stay in each stage.

Battery management device, battery system, and vehicle power supply system for managing battery state of charge level when in non-use state

According to the present invention, a state management unit measures or estimates the AC resistance value of a secondary cell at a plurality of time points, estimates a predicted transition of the AC resistance value of the secondary cell on the basis of the AC resistance value at the plurality of time points, and estimates a remaining use period until the AC resistance value of the secondary cell reaches a resistance threshold value corresponding to a time point at which usage of the secondary cell ends. When the remaining use period of the secondary cell becomes shorter than a prescribed period, an operation management unit changes the usage manner of the secondary cell method to a usage manner that has a smaller load on the secondary cell, or stops the usage of the secondary cell.

Battery management device, battery system, and battery management method for estimating transition of AC resistance value of secondary battery

In this power supplying device used in this power storage system, a power supplying unit charges a battery. A control unit controls the power supplying unit so as to charge the battery in a pulsed manner, in at least a part of a charging period of the battery. The control unit extends a unit on time and a unit off time when charging in the pulsed manner, as the temperature of the battery becomes lower.

Power supplying device, power storage system, and charging method

A control unit in a battery management apparatus discharges constant direct current from a battery for a predetermined time period or charges the battery with the constant direct current for the predetermined time period to diagnose a state of the battery. A change point is identified where a rise in voltage given by subtracting open circuit voltage of the battery from measured voltage of the battery is varied from a curved line shape to a straight line shape with respect to transition of an increase of a value in which an elapsed time since start of charge-discharge is defined as a square root of time. A rise in voltage from the voltage when the charge-discharge is started to the change point is identified as a rise in voltage caused by resistance components of electrolyte, a negative electrode, and a positive electrode of the battery and a rise in voltage after the change point is identified as a rise in voltage caused by a diffusion resistance component of the battery.

Battery diagnosis method, battery diagnosis program, battery management apparatus, and power storage system

A voltage detection unit detects voltage between both ends of a power storage unit. A current detection unit detects current flowing through the power storage unit. A control unit estimates a state of charge (SOC) of the power storage unit using an open circuit voltage (OCV) method based on the voltage detected by the voltage detection unit and estimates the SOC of the power storage unit using a current integration method based on the current detected by the current detection unit. The control unit compares the SOC estimated using the OCV method with the SOC estimated using the current integration method to determine whether micro short circuit occurs in the power storage unit.

Management apparatus and power storage system

A controller issues an instruction of charge and discharge control to charge a power storage device up to a first target SOC and to discharge the power storage device up to a second target SOC. The controller lowers the first target SOC and the second target SOC with an increase in predicted temperature of the power storage device in a next charge and discharge cycle. The controller lowers the first target SOC and the second target SOC such that the second target SOC is lower than the first target SOC.

Management apparatus, charge and discharge control apparatus, power storage system, and charge and discharge control method

A battery case includes a case main body (), a sealing body that seals an opening of the main body, and an insulating body () that is disposed at a part where the case body () and the sealing body are in contact with each other. In the battery case, an open end () of the case body () is crimped to the sealing body, and a dent () is formed in the sealing body by pressing the open end () against the sealing body.

Battery case and battery

A power generation system includes power generating modules, and a module fixing device configured to fix the power generating modules. Each power generating module includes a power generating module body including a power generator that generates DC energy, and a power transmitter attached to the power generating module body. The power transmitter includes an oscillator that converts the DC energy into RF energy with a frequency f, and a power transmitting antenna that transmits the RF energy as a resonant magnetic field. The module fixing device includes a first fixing member configured to fix the power generating modules, power receiving antennas each of which receives at least a part of the RF energy transmitted by the corresponding power transmitting antenna, and a second fixing member configured to fix the power receiving antennas. The respective outputs of the power receiving antennas are combined in parallel by the combining section.

Power generation system, power generating module, module fixing device and method for installing power generation system

A wireless power transmission unit according to the present invention transmits power wirelessly from a power transmitting sectionto a power receiving sectionthrough a resonant magnetic field. The unit includes: the power transmitting section, which resonates at a resonant frequency f0; at least one relay section, which can resonate at a frequency that is selected from multiple frequencies including the resonant frequency f0; and a resonance control sectionthat outputs information that specifies a resonance condition to be imposed on the relay sectionaccording to the arrangement of the power receiving sectionand that makes the relay sectionresonate on the resonance condition that has been specified in accordance with that information.

Wireless power transmission system

A power generator according to the present invention includes: a power generating section () for outputting DC energy; an oscillator () for converting the DC energy into RF energy having a frequency f0; a first antenna () for transmitting the RF energy; a second antenna, which receives, by coupling a resonant magnetic field, at least a part of the RF energy transmitted by the first antenna (); and an output converting section () for converting the RF energy supplied from the second antenna () into AC energy having a lower frequency than the RF energy. If the oscillator () has a voltage step-up ratio Voc, the output converting section () has a voltage step-up ratio Vtr, the first inductor () of the first antenna () has an inductance L1, the second inductor () of the second antenna () has an inductance L2, and the first and second antennas () have a coupling coefficient k, the power generator satisfies (L2/L1)&#x2267;(k/(Voc&#xd7;Vtr)).

Power generator and power generation system

An AC converter includes: a switching section, which converts the input AC voltage in response to a control signal and which outputs the converted voltage to a phase that has been selected in accordance with the control signal; a filter section, which filters out high frequency components from the converted voltage, thereby converting the converted voltage into the output AC voltage; and a switching control section, which performs a pulse density modulation on a phase-by-phase basis and in response to a reference signal with the frequency f, which is associated with the output AC voltage of each phase, synchronously with a zero cross of the input AC voltage, thereby generating the control signal according a pulse generation status by the pulse density modulation and the polarity of the input AC voltage and sending out the control signal to the switching section.

AC converter, AC converting method, and storage medium for converting an AC voltage with a relatively high frequency into an AC voltage with a relatively low frequency

A data communication apparatus is highly concealable and significantly increases time necessary for an eavesdropper to analyze cipher text. A multi-level code generation section generates, by using predetermined key information, a multi-level code sequence in which a signal level changes so as to be random numbers. The multi-level processing section combines a multi-level code sequence and information data, and generates a multi-level signal having a level corresponding to a combination of the multi-level code sequence and the information data. In the multi-level code generation section, a random number sequence generation section generates a binary random number sequence by using the predetermined key information. A multi-level conversion section generates a multi-level code sequence from the binary random number sequence in accordance with a predetermined encoding rule.

Data transmitting apparatus, data receiving apparatus and data communication apparatus

A data communication apparatus, performing a secret communication, is provided to reduce a random number generation speed using a plurality of random number generators. The data communication apparatus includes random number generation sections generating random numbers, which are each a multi-level pseudo random number, using predetermined key information includes a multi-level signal modulation section selecting a level, from among multi-levels previously prepared, selected level corresponding to information data and a multi-level sequence, which is composed of a combination of values of the random numbers and generating a multi-level modulated signal including a noise having a predetermined noise level using the selected level. Levels of a multi-level signal are in a range of the noise level, and a signal point allocation is set such that all values which are possibly taken by each of the random numbers are allocated to the plurality of levels of the multi-level signal.

Growing community of inventors

Osaka, Japan

Tomokazu Sada