Abstract: Battery cells being electrically disconnected resulting from degradation, mechanical stress, or corrosion can lead to hazardous situations during operation of electric vehicles or storage systems in stationary applications. The mentioned errors can be acceptable in some cases when cells or cell strings are connected in parallel, but the failure is to be detected in order to guarantee the reliable and safe operation of the battery system. A method enabling the estimation whether individual battery cells are faulty (cell error or electrically disconnected) by evaluating the mean impedance and capacity information of cell groups is introduced and validated.
Abstract: A major aspect for safe and efficient operation of battery electric vehicles (BEV) is the thermal management of their battery systems. As temperature uniformity and level highly affect the system performance and the lifetime, a well-defined thermal management system is substantial for high market penetration of next generation BEVs. A lot of different operation scenarios for BEVs can be conceived, with all of them having in common that at some point there is a maximum peak in heat dissipation. This worst case scenario (e.g. during fast charging) must be covered by the system design. Therefore new innovative solutions for the vehicle thermal management system have to be found, including new materials as well as adapted operation strategies. The effect on overall energy consumption, driving range, curb weight and the flexibility that can be achieved by including latent heat storage elements into the cooling system will be presented.
Abstract: Design of safe and efficient energy storage devices relies on three main pillars: Mechanical, Thermal and Electrical aspects of the system.
Fundamental requirements and trends of these three areas are presented
Notes: presented at the 13th UECT: Advanced Technologies for E-Mobility and Energy Storage, Ulm July 3rd - July 5th 2012
Abstract: As thermal ambient conditions have major influence on battery safety, performance and lifetime, thermal management is one of the most crucial points of battery pack design. In order to control the cells‘ thermal behaviour, the design of a cooling or heating system offers numerous (independent) degrees of freedom, of which a selection is presented
Notes: presented on the 25th International Trade Fair for Electronic Components, Systems and Applications - electronica
Abstract: Multiscope optimization algorithms can be utilized to optimize temperature level and uniformity within an automotive battery cell stack.
Besides the primary optimization targets, additional constraints as min/max material thickness and weight/space limitations have been considered
Notes: presented on the 2nd International Conference on Thermal Management for EV/HEVs
Abstract: Among the sub-projects related to the Li-Ion battery pack, its thermal management plays a distinguished role as it highly affects the system performance, efficiency and lifetime. That’s especially applicable for a battery pack specifically designed for extreme fast charging capability of up to 360A and almost continuous operation within challenging climate conditions.
The presentation will give an overview on all relevant steps of the design process; including specification carve out, system simulation and hardware design. Furthermore the current setup will be explained in more detail as selected novel design features will be highlighted.
