空飛ぶクルマを超える:eVTOLバッテリーの分析で明らかになった独自の運用需要(More than flying cars: eVTOL battery analysis reveals unique operating demands)

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2024-03-12 オークリッジ国立研究所(ORNL)

オークリッジ国立研究所の研究者は、垂直に離着陸する空中電動車両(eVTOL)のための新しいバッテリーを開発しており、これは配達用ドローンから都市空中タクシーまでの用途に適している。自動車用のバッテリーではなく、eVTOL用のバッテリーが必要であり、高いパワー需要に耐える材料を開発し、安全で効率的な飛行を実現するためのバッテリーシステムの開発が進行中。

<関連情報>

電動垂直離着陸(eVTOL)アプリケーションの上昇ステップにおけるリチウムイオン電池の電力性能評価 Lithium-Ion Battery Power Performance Assessment for the Climb Step of an Electric Vertical Takeoff and Landing (eVTOL) Application

Marm Dixit, Anuj Bisht, Rachid Essehli, Ruhul Amin, Chol-Bum M. Kweon, and Ilias Belharouak
ACS Energy Letters  Published:February 12, 2024
DOI:https://doi.org/10.1021/acsenergylett.3c02385

Abstract

空飛ぶクルマを超える:eVTOLバッテリーの分析で明らかになった独自の運用需要(More than flying cars: eVTOL battery analysis reveals unique operating demands)

High power is a critical requirement of lithium-ion batteries designed to satisfy the load profiles of advanced air mobility. Here, we simulate the initial takeoff step of electric vertical takeoff and landing (eVTOL) vehicles powered by a lithium-ion battery that is subjected to an intense 15C discharge pulse at the beginning of the discharge cycle followed by a subsequent low-rate discharge. We conducted extensive electrochemical testing to assess the long-term stability of a lithium-ion battery under these high-strain conditions. The main finding is that despite the performance recovery observed at low rates, the reapplication of high rates leads to drastic cell failure. While the results highlight the eVTOL battery longevity challenge, the findings also emphasize the need for tailored battery chemistry designs for eVTOL applications to address both anode plating and cathode instability. In addition, innovative second-use strategies would be paramount upon completion of the eVTOL services.

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