Tailored Battery Systems for Entry Level up to High Performance Applications

Authors

Dr.-Ing. M. Stapelbroek, Dr. M. Hüske, M. Schünemann MSc, J. M. Maiterth MSc, FEV Europe GmbH, Aachen; F. Pampel MSc, A. Sauer MSc, RWTH Aachen University; Dipl.-Ing. I. Hazanavicius, FEV Consulting GmbH, Aachen:

Year

2022

Print Info

Production/Publication ÖVK

Summary

The global trend towards electrification of vehicle powertrains requires the efficient development of different battery systems. In addition to pure battery electric vehicles, there continues to be a large market potential for (plug-in) hybrid electric vehicles up to 12 V and 48 V battery applications for mild hybrid vehicles. The respective vehicle applications have significantly different requirements for battery energy density, power density, cost, charging performance and lifetime. However, all must provide maximum safety for customers to enable full acceptance of lithium-ion batteries.

12 V and 48 V batteries for MHEVs, on the other hand, must above all be inexpensive, at least as powerful as conventional lead-acid batteries and also meet the high safety requirements for use in partially or fully automated vehicles. Battery systems specifically for hybrid vehicles must achieve a high cycle life, a high charge capability and an even higher discharge capability of up to 50 C with a capacity of only a few kWh. Moreover, in retrofit processes, this often has to be realized taking into account pronounced installation space restrictions. This results in tailored requirements for the battery cells and module design. Current battery systems for mass-market all-electric applications in a vehicle must offer ever higher energy densities, capacities of up to 150 kWh and flat packs, while maximizing safety and decreasing costs to offer customers the highest driving ranges at affordable prices. Higher energy densities at the system level are achieved through new battery cells and higher packing densities with "cell-2-pack" or "cell-2-chassis" approaches. Fast charging and interoperability concepts are critical to the success of the vehicle in this regard.

The presentation uses examples from development projects to explain the different approaches to battery development in the various application fields and shows activities and solutions to meet their individual goals. In this context, a modular high-performance battery system for hybrid electric vehicles is presented, which is based on a combined central structural element with cooling functions and offers a flexible combination of batteries with regard to the available installation space.

ISBN

1920-2323-23-1

Number of pages

23 Order