Unsicherheitsmanagement von Produktanforderungen in der Entwicklung von Hochvolt-Batteriesystemen

  • Uncertainty management of product requirements for the development of high voltage battery systems

Haunreiter, Andreas Ludwig Maximilian; Kampker, Achim (Thesis advisor); Pischinger, Stefan (Thesis advisor)

1. Auflage. - Aachen : Apprimus Verlag (2021)
Book, Dissertation / PhD Thesis

In: Ergebnisse aus der Elektromobilproduktion 14
Page(s)/Article-Nr.: 1 Online-Ressource : Illustrationen, Diagramme

Dissertation, RWTH Aachen University, 2021

Abstract

The automotive industry is subject to dynamic and disruptive change. Due to regulation by CO2 caps as the main driver, companies are investing in the development of electric drives and new vehicle models. The HV battery system plays a decisive role for the electric drive and especially for full-electric vehicles, as it essentially determines the drive characteristics and is also the most expensive component in the vehicle. The development of high voltage (HV) battery systems requires the involvement of various disciplines (especially mechanics, electrics/electronics – E/E, thermal system, electrochemistry) and largely determines the later product costs through engineering and design. Adherence to schedules and financial targets in development is challenging as product requirements have to be defined early in the development process, although required information is partly uncertain due to rapid technological leaps and lack of standards at all integration levels - from cell material, to cell and battery system. Assumptions are therefore made as the basis for product requirements. With regard to product requirements and the assumptions made, there is a need for suitable methods for managing the uncertain information as well as required changes to the product itself or its requirements. The objective is to avoid a delay in the development project and, therefore, loss of sales and profits. In this thesis a methodology is developed which defines the procedure for a successful process of uncertainty management for product requirements in HV battery system development. It enables the developer of HV battery systems to identify uncertainties, to analyze them in a suitable way, to evaluate them regarding their risk for the development project and finally to handle the uncertainties. The validation of the methodology provides evidence that the uncertainty management in the development process of HV battery systems can be applied in practice in a meaningful way already in the early concept phase. A browser-based software application, which was programmed for the use case, serves for the validation. Altogether, the methodology of uncertainty management contributes to increase the transparency within the development process, to avoid unforeseen additional efforts regarding time and costs and to improve communication and thus the process efficiency. The methodology is focused on the development of HV battery systems, but the overall methodological framework is generally valid and transferable to product development in general. The scientific contribution of the present thesis is that the existing approaches to requirements engineering (requirements management) and requirements management (change and risk management) are extended by uncertainty management and thus become an integrated approach.

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