要旨
リチウムイオン二次電池の解析結果に基づいた新たな寿命予測モデルを開発した.これにより,保存時間に依存した正確な電池容量劣化状態の予測と,予測に必要な実験データ取得時間の短縮が可能となった.本モデルには,それぞれの劣化原因が電池内で起こる電気化学反応であることに着目して,温度とエネルギーの項を有するモデル式を採用した.確立した式中に必要な係数は,温度で3水準,充電深度で3水準の合計9水準で実施した加速劣化保存試験の結果から,カーブフィッティングをおこなうことにより決定した.65℃,充電深度80%の加速劣化保存試験では,得られた係数で予測した結果が実験値と一致した.本モデルを適用することで劣化した電池の充放電曲線も予測できるため,電池端子電圧からSOCを推定することへの応用が期待される.
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Honda R&D Technical Review Vol.31 No.1 収録 (94 - 101)
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引用情報
銭 朴, 遠藤 広考, 古田 照実, 川合 光幹.
リチウムイオン二次電池のカレンダ劣化モデル開発
Honda R&D Technical Review Vol.31 No.1 pp.(94 - 101)2019.
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