An innovative balancing solution used to supply the 12V auxiliary network of an electric vehicle

Conference: PCIM Europe 2014 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/20/2014 - 05/22/2014 at Nürnberg, Deutschland

Proceedings: PCIM Europe 2014

Pages: 8Language: englishTyp: PDF

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Garnier, Laurent (CEA, LITEN, DEHT, 38054 Grenoble, France)

In a Lithium Ion battery pack, it is necessary to balance the pack in order to guarantee that at the end of the charge, all cells are fully charged. This step is necessary, otherwise the available energy stored will decrease continuously charge after charge. There are traditional ways to achieve it: an active balancing dissipative method, or a non-dissipative balancing method (energy converters) with higher level of energy saving. Both ways work to compensate the dispersion of farad efficiency (balancing) but a non-dissipative solution can also compensate dispersion of capacity of the accumulators in series. There are other solutions, which could be named "smart balancing with direct energy use" solutions, because the energy involved in balancing is used instead of being transferred between accumulators. The goal of this presentation is to describe this innovative solution, to explain its main advantages and to show how it works.