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The Scientific World Journal
Volume 2015 (2015), Article ID 979321, 8 pages
http://dx.doi.org/10.1155/2015/979321
Research Article

Analysis of Ageing Effect on Li-Polymer Batteries

1Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milano, Italy
2Department of Energy, Politecnico di Milano, 20156 Milano, Italy

Received 21 November 2014; Revised 26 January 2015; Accepted 25 February 2015

Academic Editor: Rui Xiong

Copyright © 2015 Simone Barcellona et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Lithium-ion batteries are a key technology for current and future energy storage in mobile and stationary application. In particular, they play an important role in the electrification of mobility and therefore the battery lifetime prediction is a fundamental aspect for successful market introduction. Numerous studies developed ageing models capable of predicting battery life span. Most of the previous works compared the effect of the ageing factors to a battery’s cycle life. These cycles are identical, which is not the case for electric vehicles applications. Indeed, most of the available information is based on results from laboratory testing, under very controlled environments, and using ageing protocols, which may not correctly reflect the actual utilization. For this reason, it is important to link the effect of duty cycles with the ageing of the batteries. This paper proposes a simple method to investigate the effect of the duty cycle on the batteries lifetime through tests performed on different cells for different kinds of cycle. In this way, a generic complex cycle can be seen as a composition of elemental cycles by means of Rainflow procedures. Consequently, the ageing due to any cycle can be estimated starting from the knowledge of simpler cycles.