Abstract: Method for determining the state of energy of an electrochemical accumulator, characterized in that it comprises the following steps: using a predetermined set of quadruplets of values relating to operating points of the electrochemical accumulator, reading (E101) a first state of energy SOE1 from a memory, measuring (E102) a temperature (T1), and a power (P1), representing the current operation of the accumulator, determining (E103), on the basis of the predetermined set of quadruplets, a slope of the remaining energy En in the accumulator as a function of the state of energy SOE of the accumulator, at a point representing the first state of energy SOE1, as a function of the measured temperature and measured power (T1, P1), determining (E104) a second state of energy SOE2 as a function of the determined slope, notably ? En ? SOE ? ? or ? ? ? SOE ? En , of the first state of energy SOE1, and an energy quantity (P·dt).

Abstract: The method for estimating a final state of energy SOEf of an electrochemical accumulator is carried out from a set of quadruplets of values relating to operating points of the electrochemical accumulator including power (P), temperature (T), state of energy (SOE) and remaining energy (En). Said method implementing at least one interpolation step.