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Approach Towards Uncertainties Regarding Assumption-Based Requirements in Battery System Development

机译：电池系统开发中基于假设的需求不确定性的方法

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摘要

Electric mobility is on the verge of becoming a mass consumer product, inter alia, due to C02 regulations and governmentally dictated market shares of electric cars for hybrid and full electric vehicles, e.g. in China. Major automotive OEM's have initiated programs to electrify their product portfolio significantly to achieve a 25% share of full-electric and hybrid-electric vehicles in 2025. This results in many development projects for new electrified models as well as their components, especially the electric drive train. Here, the battery is the key component for an electric vehicle. It does not only cause up to 40% of the vehicle's cost, but it is key to needed innovations in terms of energy density/range, charging capabilities and seldom materials to ensure mass-compatible and sustainable mobility. In reference to the OEMs' initiatives to drive electrification of their portfolio, many development projects are needed to provide capable battery systems for their electric vehicle fleets. Moreover, the battery is part of product updates, which means development expenses are high. Development cycles of battery systems for automotive applications are characterized by long development periods (4 to 5 years for a totally new system) and battery cells as part of the system are developed in parallel and by Asian battery cell suppliers to provide a state-of-the-art product. However, cell characteristics influence the specs of the battery system significantly, but are not known in early phases, when requirements are gathered. The reason is that there are no electro-chemical laws, unlike in mechanical material science (e.g. WOHLER-diagram for number of stress cycles). Hence, assumptions have to be made to define requirements. These assumptions, in consequence, lead to uncertainties within the development process with the risk of many engineering changes. Cell prototypes are provided rather late in the development process and lead to major changes to the battery system in a late development phases. This does not only cause significantly higher costs, but eventually milestones cannot be achieved and development takes a longer time than expected. In this context, a methodic approach has to be defined to be able validate assumptions early and to reduce the level of uncertainty to avoid late changes.
机译：尤其是由于CO 2法规和政府规定的混合动力和全电动汽车电动汽车的市场份额，电动汽车正接近成为大众消费产品的边缘。在中国。大型汽车OEM厂商已启动计划，大幅提高其产品组合的电气化程度，以在2025年达到全电动和混合电动汽车25％的份额。这导致了许多新电动模型及其零部件（尤其是电动驱动器）的开发项目培养。在此，电池是电动汽车的关键部件。它不仅造成车辆成本的40％，而且对于在能量密度/范围，充电能力和很少使用的材料方面确保质量兼容和可持续的机动性的创新至关重要。参照OEM推动其产品组合电气化的举措，需要许多开发项目来为其电动车队提供功能强大的电池系统。而且，电池是产品更新的一部分，这意味着开发费用很高。汽车用电池系统的开发周期的特点是开发周期长（全新系统需要4至5年），并且作为系统一部分的电池单元是由亚洲电池供应商并行开发的，以提供最新状态最先进的产品。但是，电池特性会严重影响电池系统的规格，但是在收集需求时，早期阶段尚不知道。原因是没有电化学法则，与机械材料科学不同（例如，应力周期数的沃勒图）。因此，必须进行假设以定义需求。结果，这些假设导致了开发过程中的不确定性，并带来了许多工程变更的风险。电池原型在开发过程的后期才提供，并导致在后期开发阶段对电池系统进行重大更改。这不仅导致成本显着提高，而且最终无法实现里程碑，并且开发所花费的时间比预期的要长。在这种情况下，必须定义一种方法性方法，以便能够及早验证假设并减少不确定性水平，以免后期发生变化。

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  • 来源
  • 会议地点 Mainz(DE)
  • 作者

    Andreas Haunreiter; Achim Kampker; Heiner Heimes; Christoph Lienemann; Saskia Wessel;

  • 作者单位

    RWTH Aachen University, Chair of Production Engineering of E-Mobility Components, RWTH Aachen University, Campus Boulevard 30, Aachen, D-52074 Germany;

    RWTH Aachen University, Chair of Production Engineering of E-Mobility Components, RWTH Aachen University, Campus Boulevard 30, Aachen, D-52074 Germany;

    RWTH Aachen University, Chair of Production Engineering of E-Mobility Components, RWTH Aachen University, Campus Boulevard 30, Aachen, D-52074 Germany;

    RWTH Aachen University, Chair of Production Engineering of E-Mobility Components, RWTH Aachen University, Campus Boulevard 30, Aachen, D-52074 Germany;

    RWTH Aachen University, Chair of Production Engineering of E-Mobility Components, RWTH Aachen University, Campus Boulevard 30, Aachen, D-52074 Germany;

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