A Generic Approach to Simulating Temperature Distributions within Commercial Lithium-Ion Battery Systems

Batteries, vol. 9, pp. 522

Abstract

Determining both the average temperature and the underlying temperature distribution within a battery system is crucial for system design, control, and operation. Therefore, thermal battery system models, which allow for the calculation of these distributions, are required. In this work, a generic thermal equivalent circuit model for commercial battery modules with passive cooling is introduced. The model approach can be easily adopted to varying system designs and sizes and is accompanied by a corresponding low-effort characterization process. The validation of the model was performed on both synthetic and measured load profiles from stationary and marine applications. The results show that the model can represent both the average temperature and the occurring temperature spread (maximum to minimum temperature) with deviations below 1 K. In addition to the introduced full-scale model, further simplifying assumptions were tested in order to reduce the computational effort required by the model. By comparing the resulting simplified models with the original full-scale model, it can be shown that both reducing the number of simulated cells and assuming electrical homogeneity between the cells in the module offer a reduction in the computation time within one order of magnitude while still retaining a high model accuracy.

Authors 4

1. Alexander Reiter corresponding Aachen Electrochemical Energy Conversion and Storage Systems Group Institute for Power Electronics and Electrical Drives (ISEA)

   Munich University of Applied Sciences · RWTH Aachen University

   Affiliation as printed

   Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Campus-Boulevard 89, 52074 Aachen, Germany

   Institute for Sustainable Energy Systems (ISES), Munich University of Applied Sciences, Lothstr. 64, 80335 Munich, Germany

   Technology Development, MAN Energy Solutions SE, Stadtbachstr. 1, 86153 Augsburg, Germany

2. Susanne Lehner
   Affiliation as printed

   Technology Development, MAN Energy Solutions SE, Stadtbachstr. 1, 86153 Augsburg, Germany

3. Oliver S. Bohlen

   Munich University of Applied Sciences

   Affiliation as printed

   Institute for Sustainable Energy Systems (ISES), Munich University of Applied Sciences, Lothstr. 64, 80335 Munich, Germany

4. Dirk Uwe Sauer Aachen Electrochemical Energy Conversion and Storage Systems Group Institute for Power Electronics and Electrical Drives (ISEA)

   RWTH Aachen University

   Affiliation as printed

   Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Campus-Boulevard 89, 52074 Aachen, Germany