The Furukawa Electric Co., Ltd.

Furukawa Automotive Systems Inc.

Furukawa Denchi Kabushiki Kaisha

Noriyasu Iwane

Taiji Mitsuyama

Naoya Takashima

Atsushi Kimura

Yuichi Watanabe

Fumikazu Iwahana

Koichi Yokoyama

Takezo Sugimura

Tamas Mihalffy

Antal Kovats

Toshiyuki Sato

Shinichi Nomoto

Takashi Iijima

Etsuzo Sato

Koji Fujimura

Toshiyuki Satoh

Tetsuya Kanou

Katsumi Inaniwa

Lorand Romvari

Takayuki Morikawa

Naotaka Uchino

Akira Oono

Keiko Chikazawa

Atsuhito Higuchi

Mamichi Tsuyuki

Keisuke Morii

Harauo Sawa

Hirokazu Narui

Kazuyoshi Sato

A chargeable battery state detection apparatus configured to detect a state of a chargeable battery is provided, comprising processor(s) and memorie(s) communicatively connected to the processor(s), wherein the processor(s) read out a group of instructions stored in the memorie(s), and execute a detection process for detecting a voltage and a current of the chargeable battery; a storage process for storing voltage values detected at different times by the detection process after charge and discharge is stopped; a fitting process for fitting, with respect to the voltage values, by adjusting coefficients of a predetermined function; a calculation process for calculating an open circuit voltage based on the function; and a discard process for discarding at least a part of the voltage values stored by the storage process when a current value or a voltage value detected by the detection process fluctuates by a predetermined threshold value or greater.

Chargeable battery state detection apparatus and chargeable battery state detection method

A secondary battery deterioration estimation device includes a memory; and a processor which executes the following processes based on executable programs stored in the memory, generating history information showing history of a use state of the secondary battery with reference to a signal output from a current sensor detecting a current flowing through the secondary battery; calculating values of elements forming an equivalent circuit of the secondary battery; calculating a state of health (SOH) of the secondary battery based on the values of the elements forming the equivalent circuit; correcting the values of the elements before the SOH is calculated or the value of the SOH obtained by the calculation based on the history information; and outputting data representing the SOH of the secondary battery.

Secondary battery deterioration estimation device and secondary battery deterioration estimation method

A secondary battery deterioration estimation device includes receiving a first signal representing a discharging voltage; receiving a second signal representing a discharging current from a current sensor; calculating values of elements forming an equivalent circuit of the secondary battery based on the first and second signals; calculating a state of health (SOH) of the secondary battery based on the values of the elements forming the equivalent circuit; generating history information showing history of a use state of the secondary battery; calculating the SOH of the secondary battery based on the history information; determining a deterioration state of the secondary battery with reference to at least one of the SOH calculated by the values of the elements or the SOH calculated by the history information by the processor in accordance with a state of the secondary battery; and outputting data representing the deterioration state of the secondary battery.

Device for estimating degradation of secondary cell, and method for estimating degradation of secondary cell

A secondary battery state detection device for detecting the state of a secondary battery includes at least one processor and at least one memory that is communicably connected to the at least one processor. The at least one processor reads a set of instructions stored in the at least one memory, and executes detection processing in which a charging voltage is detected, the charging voltage being generated when an alternator that generates an adjustable voltage charges the secondary battery; computation processing in which a charging resistance is computed as an internal resistance of the secondary battery when the alternator charges the secondary battery; and estimation processing in which a state of charge of the secondary battery is estimated on the basis of the charging voltage detected by the detection processing and on the charging resistance computed by the computation processing.

Secondary battery state detection device and secondary battery state detection method

Problem: To accurately detect the state of charge of a secondary battery regardless of the state of the same. Resolution Means: A secondary battery state detection devicefor detecting the state of a secondary batteryhas a measurement unit (voltage sensor) for measuring or estimating the open-circuit voltage of the secondary battery, a determination unit (control unit) for determining a state of charge by applying the open-circuit voltage measured or estimated by the measurement unit to a correlation equation expressing the relationship between the open-circuit voltage and state of charge, a calculation unit (control unit) for calculating a state of charge on the basis of the internal resistance of the secondary battery, and a correction unit (control unit) for correcting the correlation equation of the determination unit if the values of the state of charge determined by the determination unit and the state of charge calculated by the calculation unit differ.

[Object] To detect states of a plurality of secondary batteries whose kinds are different with high accuracy. [Organization] A measurement unit (voltage sensor, current sensor) measuring a current value of a current flowing at a secondary batteryand a voltage value of a voltage generated at the secondary battery by the current in a predetermined frequency; an optimization unit (CPU) optimizing element constants of an equivalent circuit model of the secondary battery based on the measured voltage value and the current value; an identification unit (CPU) identifying a kind of the secondary battery with reference to the optimized element constants of the equivalent circuit model; a storage unit (ROM) storing detection formulas which detect the state of the secondary battery by each kind of the secondary battery; an acquisition unit (CPU) acquiring the detection formula corresponding to the identified kind from the storage unit; and a detection unit (CPU) detecting the state of the secondary battery by applying the element constants to the acquired detection formula, are included.

Secondary battery state detecting device and secondary battery state detecting method

Described herein are techniques to accurately detect that a secondary battery has been replaced. A secondary battery state detecting device detects a state of a secondary battery installed in a vehicle. The device includes a control unit that learns element values of an equivalent circuit of the secondary battery on the basis of a voltage and a current of the secondary battery. The control unit also compares the element values obtained through learning at different timings and, when at least one of the element values has changed more than or equal to a predetermined threshold value, determines that the secondary battery has been replaced.

A secondary battery internal temperature estimation device that estimates a secondary battery's internal temperature regardless of the secondary battery's type or state of degradation, the device including: a control unit that estimates the secondary battery's internal temperature on the basis of a relational equation showing a relationship between an external temperature and the secondary battery's internal temperature. A control unit calculates element values of an equivalent circuit of the secondary battery, determines a coefficient of the relational equation on the basis of the element values of the equivalent circuit calculated by the control unit, and applies the coefficient obtained by the control unit to the relational equation. The control unit estimates the secondary battery's internal temperature on the basis of the relational equation to which the coefficient has been applied by the control unit.

Secondary battery internal temperature estimation device and secondary battery internal temperature estimation method

To provide a secondary battery state detecting device that decreases the deterioration in capacity of the secondary battery and is low in arithmetic cost. A secondary battery state detecting device that detects a state of a secondary battery includes discharge means (discharge circuit ()) for subjecting the secondary battery () to a pulse discharge, acquiring means (controller ()) for controlling the discharge means to subject the secondary battery to at least one pulse discharge, and acquiring a time variation of a voltage value at that time, calculating means (controller ()) for calculating a parameter of a predetermined function having time as a variable by fitting the variation of the voltage value acquired by the acquiring means using the predetermined function, and detecting means (controller ()) for detecting the state of the secondary battery on the basis of the parameter of the predetermined function calculated by the calculating means.

[Object] To accurately detect states of a variety of types of secondary batteries even in a low-current range. [Solution] A secondary battery state detecting device includes: a current detecting unit (a current sensor ()) that detects a value of a current flowing in a secondary battery (); a calculating unit (an equivalent circuit component calculation module ()) that calculates an equivalent circuit component that constitutes an equivalent circuit of the secondary battery; an estimating unit (a voltage drop value calculation module ()) that estimates a value of a voltage drop caused by a value of a dark current on the basis of the value of the dark current and the equivalent circuit component, the value of the dark current corresponding to a value of a current detected by the current detecting unit and the dark current flowing in the secondary battery after the vehicle has stopped, and the equivalent circuit component corresponding to the equivalent circuit component calculated by the calculating unit and having an element value varying nonlinearly in accordance with the value of the dark current; and a state detecting unit (an open circuit voltage calculation module ()) that detects a state of the secondary battery on the basis of the value of the voltage drop estimated by the estimating unit.

A state detecting method and device of a secondary battery correct impact resulting from state quantities caused by variation and calculate a state of charge with high accuracy. The state detecting method includes a first step of acquiring a detected voltage value and a detected current value, a second step of acquiring state quantities caused by variation such as a detected temperature value, a third step of determining if the detected voltage value is the voltage threshold value or greater, a fourth step of determining if the detected current value is the current threshold value or less, a fifth step of determining if a duration time of the current threshold value or less has elapsed a determination time, a sixth step of setting a state of charge in a reference state as the state of charge, and a seventh step of correcting the state of charge in the reference state.

State detecting method and state detecting device of secondary battery

A full charge sensing apparatus for sensing a fully charged state of a secondary battery based on an equivalent circuit model of the secondary battery includes a measuring unit that measures a voltage and a current during charging of the secondary battery, a learning unit that performs a learning process on a plurality of parameters in the equivalent circuit model using a result of measurement of the measuring unit, and a determining unit that determines that the secondary battery is in a fully charged state in a case where, among the parameters on which the learning process has been performed by the learning unit, a parameter corresponding to a reaction resistance of the secondary battery is greater than a predetermined threshold.

Full charge sensing apparatus and full charge sensing method

A method for detecting SOC and SOH of a storage battery includes: calculating an SOC value of the storage battery with use of an SOC calculation unit based on a measured voltage value or a measured current value of the storage battery and calculating an SOH value of the storage battery with use of an SOH calculation unit based on the SOC value; further calculating a new SOC value with use of the SOC calculation unit based on the SOH value and calculating a new SOH value with use of the SOH calculation unit based on the new SOC value, these further calculations of SOC value and SOH value being repeated a prescribed n times of at least one so as to obtain an nth calculated SOC value and an nth calculated SOH value; outputting the nth calculated SOH value as an SOH output value and outputting the nth calculated SOH value as an SOC output value; and storing the SOH output value into a memory.

Method and apparatus for determining deterioration of secondary battery, and power supply system therewith

There is provided a state-of-charge estimation method, a state-of-charge estimation device, and a secondary-battery power system that may quickly and stably determine the convergence value of an adjustment parameter of a voltage characteristic formula that may approximate change over time of an open-circuit voltage of a secondary battery with high precision by appropriately setting the initial value of the adjustment parameter. At step S, a selected voltage measurement values V, VMbi ((i=1 to (n&#x2212;1)), and VMare used to calculate an initial value A(i=1 to n) of an adjustment parameter A(i=1 to n). In addition, at step S, an integer string bi (i=1 to (n&#x2212;1)) and a real number C are used to calculate an initial value B(i=1 to n) of an adjustment parameter B(i=1 to n).

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Tokyo, Japan

Noriyasu Iwane