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.
Continental AG, Business Unit Hybrid and Electric Vehicles, Sickingenstrasse 42-46, 10553 Berlin, Germany. hans-georg.schweiger@continental-corporation.com
Hans-Georg
HG
Schweiger
Ossama
O
Obeidi
Oliver
O
Komesker
André
A
Raschke
Michael
M
Schiemann
Christian
C
Zehner
Markus
M
Gehnen
Michael
M
Keller
Peter
P
Birke
D003246:Conservation of Energy Resources / Q000379:methods*; D017097:Electric Impedance; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D019544:Equipment Failure Analysis / Q000379:methods*; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D008954:Models, Biological; D008962:Models, Theoretical
D007477:Ions; D008094:Lithium