NONLINEAR BEHAVIOR OF BATTERIES ASSOCIATE D TO POWER ELECTRONICS - STATE OF CHARGE INDICATOR

In this paper, the nonlinear behaviour of electrochemical cells submit ted to high level current pulses is examined. Gas creation caused by c urrent charge pulses, leads to an higher impedance of the cell. A batt ery state of charge (SOC) indicator based on this phenomenon is then p roposed. Indeed, fusion of data provided by response to different curr ent pulses (different levels, different duration, charge or discharge pulses) permits to give an accurate SOC indication. An experimental SO C indicator test-bench for lead-acid batteries is finally presented in this article. The discharge mode is taken into account in the algorit hm.