Method and system for online assessing state of health of a battery

A system for online assessing a state of health (SOH) of an electrochemical cell, the system comprising:

• means for estimating the state of health (SOH) of the electrochemical cell from thermodynamics data related to the electrochemical cell, the thermodynamics data including entropy and enthalpy variations ΔS, ΔH within the electrochemical cell;
• means for implementing a model providing relationships between entropy ΔS and the state of health (SOH) for the electrochemical cell;
• means for analyzing entropy data and relating the entropy data analysis to chemical characteristics of the electrochemical cell and then to the state of health (SOH) of the electrochemical cell, so as to obtain off line the ΔS-SOH model;
• and
• an entropy-revealer tool dedicated to state of health (SOH) assessment, being provided for implementing the ΔS-SOH model, the SOH assessment system implementing machine-learning models generated by the entropy-revealer tool.

A system for fast-charging a rechargeable battery with terminals connected to internal electrochemical cells, the fast-charging system comprising:

• a power supply connected to the rechargeable battery and arranged for applying a time-varying charging voltage to the battery terminals, thereby generating a charging current resulting in charging of the electrochemical cells,
• a charging-control processor for controlling the power supply, and
• a system for online assessing a state of health (SOH) of the rechargeable battery, the SOH assessment system comprising:
• means for estimating the state of health (SOH) of the electrochemical cells from thermodynamics data related to the rechargeable battery, the thermodynamics data including entropy and enthalpy variations ΔS, ΔH within the electrochemical cells,
• means for implementing a model providing relationships between entropy ΔS and the state of health (SOH) for the electrochemical cells,
• means for analyzing entropy data and relating the entropy data analysis to chemical characteristics of the electrochemical cells and then to the state of health (SOH) of the cells, so as to obtain off line the ΔS-SOH model,
• an entropy-revealer tool dedicated to state of health (SOH) assessment, being provided for implementing the ΔS-SOH model,
• the SOH assessment system implementing machine-learning models generated by the entropy-revealer tool.