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

Laurent Garnier (1, 2)

1 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
2 LITEN - Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux

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.

Domains: Electric power

Laurent Garnier. An innovative balancing solution used to supply the 12V auxiliary network of an electric vehicle. PCIM2014 - Power Electronics/Intelligent Motion/Power Quality, May 2014, Nuremberg, France. ⟨cea-03293001⟩