Electric Power Research Institute Incorporated

Peggy Pui Kei Ip

Steven Frank Willard

Miles Griffin Evans

Joseph Hunter Thompson

A method of determining battery degradation retroactively using historical data is disclosed. The method includes the steps of collecting state of charge (SOC) and DC ampere data for a predetermined time period; determining a delta (&#x394;) SOC based on the data collected; creating a set of SOC regimes having a size based on &#x394;SOC; filtering the SOC data and determining a set of points which indicate a charging or discharging event; and calculating overall Coulombs associated with each charging or discharging event and for each event, producing a timestamp and Coulombs associated with each event.

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Palo Alto, CA, United States of America

Peggy Pui Kei Ip