The Furukawa Electric Co., Ltd.

Furukawa Automotive Systems Inc.

Naoya Takashima

Noriyasu Iwane

Taiji Mitsuyama

Koichi Yokoyama

Kengo Mitose

Yukihiro Kawamura

Tamas Mihalffy

Antal Kovats

Lorand Romvari

Shinichi Nomoto

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.

Secondary battery state detection device and secondary battery state detection method

[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

An insulating body-forming part is formed on a border between a surface of a crimp terminal formed of an aluminum material and a conductive contact body provided on the surface and containing a nobler metal material than the aluminum material.

Crimp terminal, connection structural body and method for producing the same

In a connection structural body, an aluminum electric wire tip part and a crimp terminal are connected to each other. The aluminum electric wire tip part is an exposed tip part of an insulated wire including an aluminum core wire and an insulating cover for covering the aluminum core wire. The crimp terminal includes a wire barrel section for pressure-bonding and thus connecting the aluminum electric wire tip part and is formed of a metal material having a higher potential than that of the aluminum core wire. The aluminum electric wire tip part is covered with a cover solder and/or a cover resin, pressure-bonded, and connected to the wire barrel section such that the aluminum electric wire tip part is covered with the cover and/or the cover resins, with no gap, from an insulating cover tip part to a rear end portion of the wire barrel section.

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Tokyo, Japan

Naoya Takashima