リチウムイオン電池の電解液枯渇劣化を考慮した劣化モデルの確立と車載用複合蓄電システムの寿命予測

カテゴリ: 論文誌(論文単位)

グループ名: 【D】産業応用部門

発行日: 2019/08/01

タイトル(英語): Degradation Model Considering Electrolyte Dry-out Factor of Lithium Ion Battery and Lifetime Prediction of Combined Battery System for Automotive Application

著者名: 小松　大輝（（株）日立製作所 研究開発グループ），井上　健士（（株）日立製作所 研究開発グループ），牧野　茂樹（（株）日立製作所 研究開発グループ）

著者名(英語): Daiki Komatsu (Research & Development Group, Hitachi, Ltd.), Takeshi Inoue (Research & Development Group, Hitachi, Ltd.), Shigeki Makino (Research & Development Group, Hitachi, Ltd.)

キーワード: リチウムイオン，劣化モデル，電池，寿命予測，複合蓄電システム　　lithium ion battery，degradation model，battery，lifetime prediction，combined battery system

要約(英語): We developed a combined battery system using a “capacity-type” battery and a “power-type” battery for low-cost electric vehicles, which can prolong the battery life. In order to estimate the effect of the proposed combined battery system, an accurate degradation model of lithium ion batteries is needed. It is known that the main degradation factor of lithium ion batteries is the side reaction, which is the reason for the solid electrolyte interface. Usually, this degradation process of lithium ion batteries follows a square root of time law. However, in the case of some lithium ion batteries, this rule cannot be applied due to the fact that they degrade suddenly. We developed a degradation model for lithium ion batteries considering this sudden degradation, including the dissipation phenomena of the conduction path due to electrolyte dry-out. We simulated the life-extension effect of the combined battery system by using the developed degradation model and found that the “capacity-type” battery lifetime in the case of the combined battery system can be 1.65 times longer than that of the original “capacity-type only” battery system.

本誌: 電気学会論文誌D（産業応用部門誌） Vol.139 No.8 （2019）

本誌掲載ページ: 689-698 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejias/139/8/139_689/_article/-char/ja/