Patent ID: 11901517
Assignee: YASMI IP PTE. LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 4:
5. A method for assessing a state of discharge (SOD) for a cell comprising a primary electrochemical cell, the cell having an operational mode during which the cell is discharged into a load and a rest mode, the method comprising the steps of:
measuring voltage, current and temperature of the cell in a course of the operational mode and during the rest mode,
calculating entropy variation (ΔS) data, enthalpy variation (ΔH) data, Open-Circuit voltage (OCV) data and state of discharge (SOD) data, from the voltage, current and temperature measurements,
determining parameters α′, β′ and γ′ as a function of the calculated ΔS data, ΔH data, and SOD data that are linked by the following linear relationship:

SOD=100%−α′−β′ΔS−γ′ΔH, 

the determined α′, β′ and γ′ parameters associated with a first cell aging corresponding to first aging conditions,
assessing next values of SOD for the cell when submitted to new discharging conditions, by applying the linear relationship with the determined α′, β′ and γ′ parameters,
repeating the measuring, the calculating, and the determining for determining changed α′, β′ and γ′ parameters as a function of recalculated ΔS data, ΔH data, and SOC/SOD data that are linked by the linear relationship, and
the changed α′, β′ and γ′ parameters associated with a second cell aging corresponding to second aging conditions.