Method and charging device more electrochemical cells

In this method of charging a plurality of cells (5, 6, 7) electrochemical, connected in series to a charger (1) for adjusting the voltage and the charging current is continuously detects the voltage of each cell and when a first cell reaches a predetermined voltage threshold, an increment is applied to the charging current of said several cells (5, 6, 7) and simultaneously branch in parallel with said first cell, a shunt resistor of a current equivalent to the increment of the charging current of said several cells (5, 6, 7) and when each of the following cells reaches the said voltage threshold there is also connected in parallel with the cell, a shunt resistor of an equal current the charging current increment said several cells (5, 6, 7) .L'invention applies to the use of storage systems for the traction of electric vehicles and vehicles thermi c with electric range.