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関連する概念動画

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Kirchhoff's rules quantify the current flowing through a circuit and the voltage variations around the loop in a circuit. Applying Kirchhoff's rules generates a set of linear equations that allow us to find the unknown values in circuits. These may be currents, voltages, or resistances.
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高速バッテリーの使用中の内部温度をマッピングする

T M M Heenan1,2, I Mombrini1,3, A Llewellyn1

  • 1Electrochemical Innovation Laboratory, Department of Chemical Engineering, University College of London, London, UK.

Nature
|May 17, 2023
PubMed
まとめ

高速の電気自動車のバッテリー使用は 危険な内部温度上昇を引き起こします リチウムイオン電池の温度を非破壊的にマッピングし,充電プロトコルの影響による熱の蓄積を明らかにします.

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科学分野:

  • 材料科学
  • 電気化学
  • 熱管理

背景:

  • 電気自動車には高い充電/放電率が必要で,これはリチウムイオン電池の内部温度上昇につながります.
  • 密閉されたリチウムイオン電池は,内部温度測定を困難にします.
  • X線 difraktion (XRD) による電流コレクターの膨張は,破壊的でない内部温度モニタリングを提供します.

研究 の 目的:

  • 18650リチウムイオン電池の内部温度,張力,電荷状態を高速 (3°C以上) で特徴付ける.
  • 温度マッピングと単点測定のための高度なシンクロトロンXRD方法を活用する.

主な方法:

  • 細胞横断の温度マッピングのためのシンクロトロンX線 difrraction (XRD) を操作する.
  • 充電-放電サイクル中の単点XRD測定
  • 異なるエネルギーと電力最適化による18650リチウムイオン電池の特徴.

主要な成果:

  • エネルギー最適化されたセル (3.5 Ah) を20分間放電すると,内部温度>70°Cが得られました.
  • 電力最適化セル (1.5 Ah) のより速い12分の放電は,温度<50°Cを生成しました.
  • 同じ電流下 (例えば6A放電) で,両方の細胞タイプは同様のピーク温度 (~40°C) を示した.
  • オペラント温度上昇は,充電プロトコル (CC / CV) と細胞分解によって悪化する熱の蓄積に関連しています.

結論:

  • この研究は,高速度動作中のリチウムイオン電池の内部温度を測定するための新しい非破壊的な方法を示しています.
  • 充電プロトコルは熱の蓄積に大きく影響し,バッテリーの性能と寿命に影響します.
  • この方法論は,電気自動車の改善された熱管理戦略の開発を導くことができます.