PROBLEM TO BE SOLVED: To provide a device and method for estimating the parameter of a secondary battery equivalent circuit model in which it is made possible to improve the accuracy of estimating the state of charge (SOC) of a secondary battery equivalent circuit model in an actual vehicle environment.SOLUTION: An arithmetic unit of the present invention calculates, for example, the resistance value of a resistor R0 among the parameters of the equivalent circuit model by a frequency domain on, for example, a Nyquist diagram, etc. Then, the arithmetic unit calculates the remaining parameters, except the calculated resistance value of the resistor R0, using, for example, a difference equation in a time domain. When the arithmetic unit calculates the resistance value of the resistor R0 by the frequency domain, it calculates two frequency impedances Z1, Z2 in a predetermined frequency domain, and, by linear-approximating these impedances Z1, Z2, calculates a real part Re that satisfies a condition that an imaginary part Im becomes zero, as the resistance value of the resistor R0.
【課題】実車環境下において二次電池の等価回路モデルのSOC推定精度を向上できるようにした二次電池の等価回路モデルのパラメータ推定装置およびパラメータ推定方法を提供する。【解決手段】演算部は、等価回路モデルのパラメータのうちまず例えば抵抗R0の抵抗値を例えばナイキスト線図上などで周波数領域により算出する。そして、演算部は、この算出された抵抗R0の抵抗値を除く残りのパラメータを時間領域の例えば差分方程式などを用いて算出する。演算部が抵抗R0の抵抗値を周波数領域により算出するときには、予め定められた周波数範囲内における2つの周波数のインピーダンスZ1、Z2を算出し、これらのインピーダンスZ1、Z2を直線近似することで虚部Imがゼロとなる条件を満たす実部Reを抵抗R0の抵抗値として算出する。【選択図】図6
DEVICE AND METHOD FOR ESTIMATING PARAMETER OF SECONDARY BATTERY EQUIVALENT CIRCUIT
二次電池の等価回路のパラメータ推定装置及びパラメータ推定方法
2015-07-27
Patent
Electronic Resource
Japanese
IPC: | G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |
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