Integrated NVH Design of High-voltage Battery Systems for BEVs
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Integrated NVH Design of Highvoltage Battery Systems for BEVs
The global automotive market is on the verge of a historical transformation. Cars of tomorrow need to be Connected, Autonomous, Shared and Electric (Case) and the technology is there to allow it. Autoneum shows why it is of great importance also for NVH part makers to understand how the NVH packages are affected by these changes and which design tools have relevance in this context.
IMPORTANT CHALLENGE
By 2025, Battery Electric Vehicles (BEVs) and Plug-in Hybrid Electric V ehicles (PHEVs) will account for more than 20 % of all vehicles produced in Europe, according to a forecast of the European Federa-
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tion for Transport and Environment [1]. Electrified powertrains have nowadays become an important development direction for passenger vehicles. This market change opens up different challenges in the development of vehicle NVH (Noise, Vibration and Harshness) packages com-
pared to conventional Internal Combustion Engine Powertrains (ICEs). Both car manufacturers and their suppliers have to adapt their product portfolio, manufacturing process, business models and even their own organization if they want to survive in such an evolving environment.
NEW AND OLD NVH ISSUES FOR ELECTRIC VEHICLES
© Autoneum
AUTHORS
Marco Cardillo is Acoustic Engineer at Autoneum Management AG in Winterthur (Switzerland).
Federico Di Marco is Acoustic Engineer at Autoneum Management AG in Winterthur (Switzerland).
By looking at the currently available models on the market, it seems that in general car makers try to avoid the risks and costs related to the development of a brand new vehicle body, and prefer to adapt an existing body whenever possible, FIGURE 1. From an NVH perspective, the battery mass has a potentially great acoustic benefit in interior compartment noise treatment. However, quantifying this benefit is critical to guarantee the most pleasant NVH experience for passengers: Due to the comparatively heavy battery on board, OEMs are required to reduce vehicle weight while the adaptation of the body architecture is decreasing packaging space available for noise-reducing components such as floor insulators and carpets at the same time. In terms of interior NVH performance, the experimental results [2] confirm that pure BEVs have an advantage over other powertrain types when engine noise is dominant, no matter the body type. On the other hand, the higher the frequency, speed or vehicle segment, the closer the overall noise performance of BEVs gets to that of ICE models. No matter the powertrain type, the noise levels of different vehicles in the same segment stay closer to each other and powertrain electrification does not seem to bring any clear benefit in these driving conditions, FIGURE 2. NVH engineers face the major challenge of improving acoustic performance while achieving weight reduction within a reduced packaging space. An integrated design of the floor system might be an option. Floor treatment, Body-in-white
(BIW) and battery pack conf
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