PCCM for Peak Thermal Load Shaving of LIB During 6C Fast Charge

Lithium-Ion Secondary Batteries (LIB) have a narrow operational window in terms of cell temperature. The optimum working temperature is between 15 and 45°C. Thus, modern battery systems for electric vehicles have complex active thermal management systems allowing for heating and cooling to operate the LIB in its desired temperature range. These systems often need to […]

State of Health Estimation of Lithium-Ion Batteries under Real-World Operational Conditions

Due to the transition to electric mobility the interest for the battery as core component of every battery electric vehicle (BEV) and its State of Health (SOH) rises. Multiple supervised machine learning methods have been applied to the regression task of SOH estimation of lithium-ion batteries from the charging curve under laboratory operational conditions [1–6]. […]

Parametrization & time-domain transformation of discrete transmission line models for graphite electrodes

Transmission line model (TLM) or mixed conducting networks are used frequently for the characterization of porous electrodes based on the electrodes’ impedance data, showing the influence of the porous morphology and of spatially distributed behavior in the frequency domain. For this purpose, transfer functions are used to characterize the TLM, representing the overall polarization behavior […]

Measurement of the Frequency Dependent Acoustical Transmission for the Characterisation of Mechanical Changes in Lithium-Ion Cells

The poster describes the performed steps in order to develop a reproducible ultrasonic-based diagnosis method for lithium-ion cells. In order to assess how useful this method can be several measurements where performed to answer the following questions: How easily can variations in temperature or the sensor coupling affect the results? Secondly, what are typical statistical […]

Electrochemical modeling, validation and parameter identification under high current discharge conditions for a commercial Li-ion battery.

Extreme scenarios of high discharge current must be understood for better battery management system design. Physics-based modeling can give a better insight into the battery response compared to equivalent circuit models but can be challenging due to the large number of parameters. In this work, an electrochemical pseudo-2D model is developed and used in the […]

A new method for the mechanical characterization of automotive lithium-ion pouch cells

Large-format pouch cells are widely used in the automotive industry and stacked in modules to increase energy density on battery level. Since pouch cells are packaged in a flexible foil (pouch bag) a mechanically stable module design is crucial for battery safety and optimum lifetime [1]. Design of such requires information about the mechanical properties […]