Michael Schiemann

Comparison of Several Methods for Determining the Internal Resistance of Lithium Ion Cells

The internal resistance is the key parameter for determining power, energy efficiency and lost heat of a lithium ion cell. Precise knowledge of this value is vital for designing battery systems for automotive applications. Internal resistance of a cell was determined by current step methods, AC (alternating current) methods, electrochemical impedance spectroscopy and thermal loss methods. The outcomes of these measurements have been compared with each other. If charge or discharge of the cell is limited, current step methods provide the same results as energy loss methods.

Lithium-Ionen-Batterie — Entwicklungen für Hybrid- und Elektrofahrzeuge

Die erste in groseren Stuckzahlen hergestellte Lithium-Ionen-Batterie fur den Einsatz in einem Serienfahrzeug liefert Continental fur den Mercedes S 400 Hybrid — und arbeitet bereits an Folgegenerationen der Speichertechnik. Der Zulieferer beschreibt Zellen- und Systemstrategien sowie sicherheitsrelevante Fertigungsdetails und Integrationsstrategien, die den Einsatz in Hybrid- und Elektrofahrzeugen bestimmen.

Lithium-ion batteries for hybrid and electric vehicles

Continental is the first company worldwide to produce lithium-ion batteries for a serial production vehicle (Mercedes S 400 Hybrid). The supplier describes cell and system strategies, as well as safety relevant production details and integration strategies, which determine the application in hybrid and electric vehicles.