Modeling Study of the Battery Pack Sizing for the Electric Conversion of a Commercial Vehicle STEMS - CNR

Format:

Book

Conference/Event

Author/Creator:

Sequino, Luigi, author.

Contributor:

Mancaruso, Ezio

Vaglieco, Bianca Maria

Conference Name:

15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Many aspects of battery electric vehicles are very challenging from the engineering point of view, in terms of safety, weight, electric range, drivability. Commercial vehicle engines are often subjected to high loads even at low speeds. This can lead to an intense increment of the battery pack temperature and strong stress of the cooling system. Therefore, the optimal design of the battery pack and the relative cooling system is essential. The present study aims to investigate the trade-off between the big size battery packs, with low electrical stress on the cells, low temperature increments but high weight as a drawback, versus small size battery packs, where there are benefits in terms of total weight against an intense use of the cells capacity and then a substantial temperature increment. The battery pack substitutes a 3.0 l, 135 kW power compression ignition engine for commercial vehicles. The curve of delivered power during the homologation cycle WLTC has been experimentally recorded with the engine at the test bench and then used to obtain the discharge current profile for the battery pack. The battery pack has been conceived as made of Li-polymer pouch type cells, whose shape provides easy stackability and high volumetric efficiency. A single cell has been experimentally investigated via infrared imaging during a discharge cycle and the following resting phase for the estimation of the battery thermal parameters. Then, an equivalent circuit model of the battery has been set-up using the experimental results of a multi-step test cycle. The electrical and thermal characteristics of the battery under investigation have been finally used to model different battery packs with liquid cooling. The trade-off between battery pack weight and generated heat has been analyzed with the vehicle performing the WLTC cycle. The obtained results provide insights for the dimensioning of a battery pack; they are revealed to be useful for a low-cost, preliminary analysis for the electric conversion of a fossil fuel vehicle

Notes:

Vendor supplied data

Publisher Number:

2021-24-0112

Access Restriction:

Restricted for use by site license