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Smart electric vehicle (EV) charging and grid integration apparatus and methods

United States Patent

May 5, 2015
View the Complete Patent at the US Patent & Trademark Office
An expert system manages a power grid wherein charging stations are connected to the power grid, with electric vehicles connected to the charging stations, whereby the expert system selectively backfills power from connected electric vehicles to the power grid through a grid tie inverter (if present) within the charging stations. In more traditional usage, the expert system allows for electric vehicle charging, coupled with user preferences as to charge time, charge cost, and charging station capabilities, without exceeding the power grid capacity at any point. A robust yet accurate state of charge (SOC) calculation method is also presented, whereby initially an open circuit voltage (OCV) based on sampled battery voltages and currents is calculated, and then the SOC is obtained based on a mapping between a previously measured reference OCV (ROCV) and SOC. The OCV-SOC calculation method accommodates likely any battery type with any current profile.
Gadh; Rajit (Los Angeles, CA), Mal; Siddhartha (Santa Monica, CA), Prabhu; Shivanand (Los Angeles, CA), Chu; Chi-Cheng (Laguna Beach, CA), Sheikh; Omar (Valencia, CA), Chung; Ching-Yen (New Taipei, TW), He; Lei (Irvine, CA), Xiao; Bingjun (Los Angeles, CA), Shi; Yiyu (Rolla, MO)
The Regents of the University of California (Oakland, CA)
13/ 693,747
December 4, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under DE-OE0000192, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.