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

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.
Authors:
; ; ; ; ; ; ; ;
Publication Date:
OSTI Identifier:
1179006
Report Number(s):
9,026,347
13/693,747
DOE Contract Number:
OE0000192
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 Dec 04
Research Org:
The Regents of the University of California, Oakland, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 25 ENERGY STORAGE; 33 ADVANCED PROPULSION SYSTEMS