Method for estimating a battery state of health
2014
A method of calibrating a battery for storing calibration data relating to its condition, characterized in that it comprises the following steps: E1: determining at least one characteristic state of the battery, intermediate between its full charge and full discharge by detecting a peak of the evolution of the derivative of its open circuit voltage during a charge or discharge of the battery, or at least one characteristic state at full charge or full discharge, or defined by the passage of a voltage threshold, respectively current during a current phase imposed imposed voltage respectively during a charge or discharge of the battery; E2: defining a reference state of the battery from this characteristic condition; E4-E7: measuring IVCOs load voltages of the battery to the reference state for several distinct health states Sohi and storing these calibration data comprising at least pairs of real values health status / open circuit voltage (Sohi , IVCOs) in an electronic memory.
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