Design of the battery management system of LiFePO4 batteries for electric off-road vehicles

This paper describes the design of a modular battery management system for electric off-road vehicles, where lithiumion batteries are expected to be widely used. A massive electrification of off-road vehicles can be enabled by the availability of a standard battery module, provided with an effective management unit. The design and some preliminary experimental results of the module management unit are discussed in this paper. The unit contains a high current active equalizer that enables the dynamic charge equalization among cells and maximizes the usable capacity of the battery

E-transportation: the role of embedded systems in electric energy transfer from grid to vehicle

Electric vehicles (EVs) are a promising solution to reduce the transportation dependency on oil, as well as the environmental concerns. Realization of E-transportation relies on providing electrical energy to the EVs in an effective way. Energy storage system (ESS) technologies, including batteries and ultra-capacitors, have been significantly improved in terms of stored energy and power. Beside technology advancements, a battery management system is necessary to enhance safety, reliability and efficiency of the battery. Moreover, charging infrastructure is crucial to transfer electrical energy from the grid to the EV in an effective and reliable way. Every aspect of E-transportation is permeated by the presence of an intelligent hardware platform, which is embedded in the vehicle components, provided with the proper interfaces to address the communication, control and sensing needs. This embedded system controls the power electronics devices, negotiates with the partners in multi-agent scenarios, and performs fundamental tasks such as power flow control and battery management. The aim of this paper is to give an overview of the open challenges in E-transportation and to show the fundamental role played by embedded systems. The conclusion is that transportation electrification cannot fully be realized without the inclusion of the recent advancements in embedded systems

Sistemi di Gestione di Batterie al Litio per la Trazione Elettrica

La presente tesi tratta lo sviluppo di un sistema di gestione di batterie al litio per applicazioni di potenza, quale la trazione elettrica. Il sistema elettronico è stato progettato in tutte le sue parti e ne sono stati realizzati alcuni prototipi. I risultati di test sperimentali effettuati su tali prototipi sono presentati e confrontati con lo stato dell'arte. Sono state trattate inoltre tecniche di stima dello stato di carica per celle al litio e sistemi di equalizzazione attiva della carica ad alta efficienza