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

Claim 0:
1. A method for assessing a state of charge/discharge (SOC/SOD) for a cell comprising a secondary electrochemical cell, the cell having a first operational mode during which the cell is charged from a power supply connected to terminals of the cell, and a second 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 first and second operational modes and during the rest mode,
calculating entropy variation (ΔS) data, enthalpy variation (ΔH) data, Open-Circuit voltage (OCV) data and state of charge/discharge (SOC/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 SOC/SOD data that are linked by the following linear relationship:

SOC=α+βΔS+γΔH 

SOD=100%−SOC,

the determined α, β and γ parameters associated with a first cell aging corresponding to a first number of charging cycles of the cell,
assessing next values of SOC/SOD for the cell when submitted to new charging/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 a second number of charging cycles of the cell.