Méthodologie de remontée d'échelle pour la modélisation des batteries Li-ions

Overview & Synopsis

Li-ion battery technology has a great success and is widely used in various portable technologies and for transport. However, giving the diversity of battery chemistry and the numerous aging phenomena, it remains critical for battery pack designers to resort to simulation of battery performance and aging in order to optimize the module design. Li-ion batteries are multiscale systems where modifications at microscopic length scales have a large impact on global cell characteristics. Mathematical models of these systems must therefore be able to link the global cell characteristics to the description of the physical phenomena at microscopic scales. The aim of the thesis is to develop an up-scaling methodology able to connect the microscopic multi-physic models to the simplified equivalent electrical circuit models used by battery module's designers. This up-scaling methodology will be implemented based on physical model at the electrode scale and validated with experimental measurements in the beginning of life of the battery and during its lifetime.