Authors:
Tolga Bozalp
1
;
Muhammad Ammad Raza Siddiqui
2
;
Holger Opfer
1
and
Thomas Vietor
2
Affiliations:
1
Volkswagen AG, Berlinger Ring 2, 38440 Wolfsburg, Germany
;
2
Technische Universität Braunschweig, Institute for Engineering Design, Hermann-Blenk-Straße 42, 38108 Braunschweig, Germany
Keyword(s):
Battery Module, Simulation, Mechanical Ageing, Swelling, Pouch Cell, Cycle Life, Multiscale Simulation, Lithium-ion.
Abstract:
This study introduces a novel method for modelling the mechanical ageing behavior of battery modules over lifetime, based on a simplified, mathematical approach. The focus is placed on the force displacement behavior of battery modules due to the swelling of its cells in the course of electrochemical ageing. In the first step, the development of a proper modelling method is conducted, before the implementation of the single-domain model is carried out. Multiple size scales are included in this model, since cell and battery module level are considered. The model implementation is realized with two different approaches for examination of simulation trade-offs regarding accuracy and computing time. In the first approach, the module is modelled using the Finite-Element-Analysis (FEA) with a high number of elements. In an alternative, more simplified approach, the module model in form of a mathematical, analogous model is implemented with a significantly fewer number of elements. In both
cases, the model layout is similar. Finally, both the approaches are validated with experimental measurements and compared regarding accuracy and computing time, amongst other parameter.
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