Gm Global Technolgoy Operations, Inc.

John E Novak

Brian James Koch

Patrick Frost

Damon R Frisch

Patricia M Laskowsky

Raghunathan K

Gregory E Smith

Brett B Stawinski

Monica E Dykas

System and methods for estimating a relationship between a SOC and an OCV of a battery system included in a vehicle are presented. In certain embodiments, an initial relationship between an open circuit voltage ('OCV') and a state of charge ('SOC') of a cell of the battery system may be determined at a beginning of life of the cell. Changes in one or more stoichiometric points of a half-cell of the cell may be determined as the cell ages. Based on the determined stoichiometric point changes of the half-cell, an initial relationship between the OCV and the SOC of the cell may be adjusted to generate an updated relationship between the OCV and the SOC of the cell.

Systems and methods for estimating battery system parameters

System and methods for estimating a capacity of a battery system and/or a constituent cell and/or pack included in a vehicle are presented. In certain embodiments, a method for estimating a capacity of a battery system may include determining voltage-based state of charge ('SOC') data of a pack of the battery system based on measured pack voltage information and a relationship between an open circuit voltage ('OCV') and the SOC of the pack of at a beginning of life of the pack. Beginning of life SOC data of the pack may be determined based on coulomb counting measurements, and a ratio may be determined based on the beginning of life SOC data of the pack and the voltage-based SOC data of the pack. An estimated present capacity of the pack may be determined based on the beginning of life capacity of the pack and the ratio.

Battery system capacity estimation systems and methods

System and methods for determining battery system power capability in a vehicle are presented. Peak power capability estimation systems and methods disclosed herein may compensate regressed parameters in a battery system circuit model for an effect of current magnitude. Utilizing the disclosed methods for accurately estimating peak power capability of a battery system may provide for, among other things, improved battery system performance modeling and/or improved battery system control and management decisions.

Systems and methods for determining battery system power capability

A method for use with a vehicle battery pack, where the method determines a voltage threshold that may prevent the vehicle battery pack from being overcharged. The voltage threshold may be a dynamic threshold that changes or adjusts over time in order to accommodate changing conditions in the vehicle battery pack, the vehicle and/or the surrounding environment. The method may consider one or more battery readings when determining the voltage threshold, including temperature, voltage and/or current readings. According to one embodiment, the method is designed to accommodate high-current, short-duration charging events, like regenerative breaking.

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Dexter, MI, United States of America

John E Novak