成果報告書詳細
管理番号20120000000169
タイトル*平成23年度中間年報 安全・低コスト大規模蓄電システム技術開発/共通基盤研究/過渡現象を利用する大規模蓄電システムの非破壊劣化診断技術の開発
公開日2012/6/29
報告書年度2011 - 2011
委託先名学校法人同志社 同志社大学
プロジェクト番号P11007
部署名スマートコミュニティ部
和文要約和文要約等以下本編抜粋:
[記載項目]
1. 研究開発の内容及び成果等
(1)目的・概要
太陽光発電、風力発電などの再生可能エネルギーの大量普及には、短周期の周波数変動に対する調整力確保などの電力系統安定化対策として系統安定化用蓄電システム開発が必要である。この系統安定化用蓄電システムには20年以上という長期耐久性が求められており、その耐久性を評価、保証するという観点から、大規模蓄電池システムを非破壊で、かつ稼働状態で診断可能な方法は提案されておらず、早急に劣化診断技術を開発する必要がある。
英文要約A dynamic estimation of Li-ion battery model
 Lithium-Ion battery has attracted much attention because of its high energy density and large charging/discharging current. It is widely used from a small mobile device to a large-scale energy storage system. The dynamic characteristic of the battery heavily depends on its State Of Charge (SOC) and charging/discharging current, because the maximum charging/discharging current of a large capacity battery is limited by the terminal voltage, which depends on the SOC and the internal impedance of the battery. A numerical simulation plays an important role in the effective usage of the battery and a design of an energy storage system. An accurate battery model is indispensable to the simulation. The model parameters have a close relation to its life time. A dynamic modeling during its actual operation is important for a development of a self-diagnosis circuit of an energy storage system. An estimation method of a Li-ion battery model, which expresses its transient characteristic, is proposed in this research. The modeling is carried out using symbolic computation capabilities of Maple.
 An estimation method of circuit parameters of a Lithium-ion battery model is proposed in this research. The model consists of a DC voltage source and an internal impedance. The method gives the circuit parameters from a pair of the battery voltage and current waveforms during its operation.
 The voltage of the source is a function of the SOC. The internal impedance can be expressed by a resistor and some RC parallel circuits connected in series. The series resistor expresses the voltage drop in steady state, and its resistance is obtained from the voltage fluctuation proportional to the battery current. The RC parallel circuits express the transient characteristic of the battery. An estimation method of their parameters is proposed using z-transform in this research. The proposed method gives satisfactory accurate parameters without initial values, which are indispensable to the conventional nonlinear approximation method.
 The impedance of lithium-ion battery originates from various processes, and understanding of the origins of the impedance is important for establishing the degradation-diagnosis method using voltage transients. In FY2011, half-cells of commercially available graphite negative electrode and spinel LiMn2O4 positive electrode were prepared, and the ac impedance was measured change in the impedance of each electrode were analyzed using an equivalent circuit.
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