Method for determining the state of health of a battery

An electronic system for managing state of health (SOH) of a battery comprising at least one rechargeable cell, the system including:

• means for measuring in real time an impedance (Rmes,n) of at least one cell;
• electronic means adapted to—determine a state of charge (SOC) for at least one cell;
• determine at least one confidence coefficient accounting on reliability of the impedance as a function of at least one variable selected from current, temperature or state of charge of the at least one rechargeable cell, or the derivatives or integrals thereof with respect to time;
• determine in real time the state of health of the battery at a given point in time (SOHn), using the state of health of the battery at a preceding point in time (SOHn-1) corrected as a function of said impedance at the given point in time (Rmes,n) and weighted by the at least one confidence coefficient.

A battery comprising:

• at least one electrochemical cell;
• an electronic system including:
• means for measuring in real time an impedance (Rmes,n) of at least one cell;
• means for measuring in real time temperature of at least one cell;
• electronic means adapted to
• determine a state of charge (SOC) for at least one cell;
• determine at least one confidence coefficient accounting on reliability of the impedance as a function of at least one variable selected from current, temperature or state of charge of the at least one rechargeable cell, or the derivatives or integrals thereof with respect to time;
• determine in real time the state of health of the battery at a given point in time (SOHn), using the state of health of the battery at a preceding point in time (SOHn-1) corrected as a function of said impedance at the given point in time (Rmes,n) and weighted by the at least one confidence coefficient.