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: To ensure the safety of a battery system certain measures can be employed. Monitoring the
actual battery temperature is crucial to guarantee a safe use of the system while an optimized
cooling system for the battery pack helps to improve the liability, prevent safety shut-o s and
extend the battery's lifetime. Additionally, possibilities to monitor the state of health of the
battery on a longer time scale are necessary to avoid over-stretching the battery's capability of
storing energy on the one hand and to reduce investment costs on the other hand.
This paper deals with di fferent approaches to handle the battery temperature, especially under
challenging tropical outside conditions. A temperature distribution model is developed and
evaluated using combined data from a sensor matrix and an infrared camera. This method
is used for real-time temperature measurements to investigate and monitor the temperature
distribution on pouch cells. The simulation of di erent cooling systems is presented to show the
need of a steady temperature distribution within a battery pack. The goal is to avoid excessive
load on certain cells, which has a high impact on a safe use of the pack and reduces lifetime
signi fficantly. Finally, an approach to characterize the battery thermodynamically is presented.
This is expected to be a useful tool to measure and monitor the state of health of a battery and
first investigations are shown for diff erent cell chemistries, performed on commercially available
full cells.
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.
