METHOD AND DEVICE FOR ASSESSING AN INDICATOR OF THE STATE OF HEALTH OF A CELL OF A LITHIUM BATTERY

摘要

The lithium battery is composed of one or more cells connected to each other. The evaluation method comprises the following steps:Detection (E2, E3) of a first predetermined voltage U1 then of a second predetermined voltage U2, of the cell, respectively at a first instant t1 and at a second instant t2, during a discharge or charge phase of battery ;Calculating (E4) a quantity of actual electric charge, discharged or charged by the cell between instants t1 and t2, by integration over time of an electric current through the cell;¢ determination (E5) of the health status indicator of the cell by calculating a ratio between said calculated actual electric charge amount and a reference electric charge quantity that would be discharged or loaded by said cell at the beginning during a discharge or charge phase passing from one to the other of the first and second predetermined voltages U1 and U2.