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SYSTEMS AND METHODS FOR DIRECT ESTIMATION OF BATTERY PARAMETERS USING ONLY CHARGE/DISCHARGE CURVES

United States Patent Application

20180097396
A1
View the Complete Application at the US Patent & Trademark Office
Electrochemical models for the lithium-ion battery are useful in predicting and controlling its performance. The values of the parameters in these models are vital to their accuracy. However, not all parameters can be measured precisely, especially when destructive methods are prohibited. In some embodiments of the present disclosure, a parameter estimation approach is used to estimate the open circuit potential of the positive electrode (Up) using piecewise linear approximation together with all the other parameters of a single particle model. Up and 10 more parameters may be estimated from a single discharge curve without knowledge of the electrode chemistry using a technique such as a genetic algorithm. Different case studies were presented for estimating Up with different types of parameters of the battery model. The estimated parameters were then validated by comparing simulations at different discharge rates with experimental data.
Qi, Yanbo (Seattle, WA), Kolluri, Suryanarayana (Seattle, WA), Subramanian, Venkat (Seattle, WA), Chen, Sung-Yuan (Seattle, WA)
University of Washington (Seattle WA)
15/ 725,192
October 4, 2017
STATEMENT OF GOVERNMENT LICENSE RIGHTS [0002] This invention was made with Government support under Grant No. DE-AR0000275, awarded by the Department of Energy. The Government has certain rights in the invention.