Abstract
The battery system is a main driver of current reservations against electrical vehicles, because it influences aspects like vehicle range, charging time and costs. Further the battery system is highly connected to the surrounding subsystems of the vehicle. Hence, developing battery systems means to deal with manifold interconnectivities. Within this, sufficient and transparent objectives for the battery system have to be defined. This work presents a systematic approach to defining objectives for the battery system down to the behavior of battery cells by considering the drive system in relevant use cases. Three investigations on the complexity of developing battery systems are done: Interviews with engineers to investigate the challenges of developing battery systems, parameter variation in a vehicle simulation model to analyze the influences of the surrounding systems and analysis of the theoretical interdependencies between battery system, power electronics and electric drive. The findings in combination with the literature research lead to requirements to be met by the approach. In addition to the battery system the configuration of the drive system should be considered as well as different customer relevant use cases. An approach to defining objectives for battery systems based on a parameter variation is introduced and it is explained how concrete objectives can be derived from customer perceptions in a transparent way.
Highlights
Many different circumstances lead to the increasing importance of electrified drive systems to passenger vehicles in private and public use
Continuous expansion and concretization of the system of objectives is a central aspect in product engineering processes to develop successful products for the market
An adequate system of objectives is of high importance to successful products and the development of battery systems taking into account many interconnections, there are no systematic approaches to deriving and concretizing objectives for the battery system and cells in current research
Summary
Many different circumstances lead to the increasing importance of electrified drive systems to passenger vehicles in private and public use. The first reason is the global shift of energies demanded by politics. Several laws and guidelines for example require decreasing emissions of carbon dioxide and lower energy consumptions of vehicle fleets. There is a shift of environmental awareness in society. People mind their behavior and influence on the environment and try to act in a sustainable way. There is the increased driving pleasure offered by electric vehicles. Due to the high torque available from a standing position and the agile behavior of electric drives, high acceleration and sportive driving are possible
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