Patent ID: 6975094
Filing Date: 2005-12-13
Classification: H02J,Y02T

Abstract:
1. Method of charging several electrochemical cells ( 5 , 6 , 7 ), in particular Lithium-Polymer cells, connected in series to a charger ( 1 ) which allows adjusting the voltage and the charging current, the method comprising permanently detecting the voltage of each cell and when a cell reaches a predetermined threshold voltage, shunting the current of that cell, characterised by, when a first cell reaches the threshold voltage, applying an increment to the charging current of said several cells ( 5 , 6 , 7 ) and simultaneously connecting in parallel to said cell, a shunt resistor of a current equivalent to the increment of the charging current of said several cells ( 5 , 6 , 7 ), and by, when each of the subsequent cells reaches said threshold voltage, connecting also in parallel to each cell, a shunt resistor of a current equal to the increment in the charging current of said several cells ( 5 , 6 , 7 ), wherein the charging current is calculated according to the formula: where T is the temperature of the cells, S is the free surface of the cells being charged, A is between 80 and 150 and preferably between 105 and 110 and B is between 4200 K and 4800 K and preferably between 4400 K and 4600 K.