La maitrise du vieillissement des batteries Lithium-ion est un point clé dans le développement des applications embarquées et notamment automobiles. Cet article donne certaines bases nécessaires pour comprendre les enjeux et interpréter les résultats annoncés pour le vieillissement des batteries. Il apparaît que la forte influence des conditions d'...
Energy and power fade of lithium-ion batteries over time is a cause of complaints from Electric and Hybrid vehicles customers. Car manufacturers strive to improve accuracy of battery performance degradation predictions, in order to reduce warranty costs. Currently, these predictions are mainly based on accelerated aging tests in cycling mode or on ...
This paper presents the MOBICUS project experiment protocols with some first results. Twelve partners from companies and research labs have joined forces to conduct a large study on lithium-ion batteries (LIB) aging under real automotive conditions. Experiments include not only calendar or cycling aging tests, which a part of them was built using a...
COMPTE RENDU DE RECHERCHE
COMPTE RENDU DE RECHERCHE
In this paper we present an innovative and precise way to calculate the available capacity in a battery. This quantity is essential to assess the ageing process during real use or ageing tests. The most common way to measure the battery capacity consists on a constant current discharge. It is quite simple to implement but very dependent of impedanc...
Using the hybrid electric vehicle application as a reference, the possible impact of periodic current pulses on lithium ion secondary battery cycle life was evaluated. Several profile types, with and without pulses, were evaluated in a comparative study on cycle life of commercial graphite/LiFePO4 batteries. Results are presented, compared and anal...
COMPTE RENDU DE RECHERCHE
Graphite/LFP commercial cells are stored under 3 different conditions of temperature (30 °C, 45 °C, and 60 °C) and SOC (30%, 65%, and 100%) during up to 8 months. Several non-destructive electrochemical tests are performed at different storage times in order to understand calendar aging phenomena. After storage, all the cells except those stored at...
In applications such as electrical transportation, most of the battery life is spent under storage. Understanding and estimating aging under storage, also named as calendar aging, is therefore a prerequisite for cell life prediction. This work investigates aging behavior upon storage of a commercial 15 Ah lithium-ion graphite/iron phosphate cell. P...
