load balancing and system for batteries

The present invention relates to a balancing of power battery charging system (1) comprising at least two stages (11) accumulator (s) placed in series, an accumulator stage (s) (11) comprising at least an accumulator (9). Said system comprises: - a plurality of converters (7) singly connected in parallel respectively connected firstly to a predefined number of stages of accumulator (s) (11) associated, and secondly to a low voltage network of the control gear of a motor vehicle power supply, and a control unit (14) of said converters (7) configured to control at least one converter (7) so as to cause the preset number of stages of accumulator ( s) associated with a similar level of charge or discharge, and to control a transfer of energy from the power battery (1) to said low-voltage network via said converters (7) so as to supply said auxiliary.