Abstract: Method for determining the state of health of a lithium-ion battery A method for determining the state of health (SOH) of a lithium-ion battery (1), comprising: a first step (E1) of determining a function (f) of the incremental capacity of the battery, a second step (E2) of identifying peaks (P1, P2, P3) of the function (f) determined in the first step (E1), a third step (E3) of determining voltages (U1, U2, U3) across the terminals of the battery (1) for which said peaks (P1, P2, P3) are obtained, a fourth step (E4) of determining the amplitudes of said peaks (P1, P2, P3), a sixth step (E6) of determining the state of health (SOH) of the battery (1) on the basis of a degradation mode of the battery and on the basis of the amplitudes determined in the fourth step (E4).