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Publications (8)
When charging a lithium-ion cell, the deposition of metallic lithium on the negative electrode surface, known as lithium plating, must be avoided. In this paper, the charging process of a commercial high energy lithium-ion pouch cell is investigated. Three-electrode test cells are assembled using electrode materials from the high energy lithium-ion...
In this work a parametrization approach as well as the modelling of a physico-chemical impedance model are explained. Furthermore relaxation behavior on the full-cell and the half-cells are shown. Finally the validation of the parametrized model is presented. The main relaxation effect in the full-cell is caused by different graphite plateaus and i...
Accurate battery simulation requires a suitable parameterisation of the electric cell behaviour. Several parameters need to be determined [1] – this study focuses on measuring the exchange current density, which can be determined by electrochemical impedance spectroscopy (EIS). To assign the identified processes to the anode or cathode, the distrib...
The Newman Li-ion battery model for porous electrodes is simplified for real time simulations. All processes are linearized for SOC ranges and a linear equation set is derived. The diffusion model in particles is simplified and the influence of the electrolyte concentration is separated.
Several cells of a Tesla Model S Module after a usage of 25000 km are examined with respect to their electrical and thermal parameters. Also a short study on the influence of different currents during cycling is performed.
This work presents a new approach for parameter identification of impedance based lithium ion battery models. The model is a complex physically motivated two particles model consisting of seven elements. In order to find the correct local optimum, the distribution of relaxation times of the measured signal is used in combination with a least square...
Performance, safety and lifetime of Li-ion batteries are closely connected topics, which are strongly influenced by electrical and thermal inhomogeneities occurring during operation inside the system. These inhomogeneities might impact large-sized automotive cells over complete life cycles significantly; however current lifetime models are not able...
