Temperature analysis of Lithium-Ion Batteries: characterization and modeling
DEI Edificio 24 - Aula Alfa
23 Novembre 2010
Nowadays lithium-ion batteries represent the choice of energy carrier for many electric applications: from small electronics to Electric Vehicles (EVs). There are several topics related to battery applications that still have to be solved and among all the research activities, SoC estimation plays a key role: SoC knowledge allows to correctly and safely manage the battery. During the years different methodologies and techniques has been developed, in order to obtain more and more accurate SoC estimations.
Some of the commonly used estimation algorithms use external parameters of the battery (such as current and voltage) and the previous charges and discharges of the battery. One drawback of most of these algorithms is that they don’t consider some operating conditions such us the temperature of the battery, which instead affects very much the performances (particularly at low temperature).
This work aims to study the performance variation of the lithium ion batteries at different temperature. A custom set-up for tests has to be created: it consists of a little and portable chamber to control battery temperature, an acquisition board (that measure and store the values of voltage, current and temperature) and a driving circuit that charge and discharge the battery with programmed current profile. With experimental results, it can be possible to improve the present battery model and SoC estimation algorithm, including the dependence on the temperature, which affects both the maximum obtainable open circuit voltage and the battery capacity.
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