Ramona V Ying

6639385, Oct 28, 2003

Jul 22, 2002

10/200604

Mark William Verbrugge - Troy MI
Damon R. Frisch - Troy MI
Ramona Y. Ying - Rochester Hills MI
Brian James Koch - Berkley MI
Shawn D. Sarbacker - Royal Oak MI

General Motors Corporation - Detroit MI

H01M 1044

320132

A method for determining state of charge (SOC) of a battery system based upon an equivalent circuit of the battery system. A potential and resistance of the equivalent circuit are computed. The method uses a least squares regression means, and includes: providing a plurality of data points as a starting point based upon determinations including measurement or prior computation, wherein the determinations include a determination of a voltage of the battery system; weighting the plurality of data points; and computing values of the resistance and potential based upon weighted data points using recursive formulas, wherein only a state at a previous time is reflected respectively.

6646419, Nov 11, 2003

May 15, 2002

10/145938

Ramona Y. Ying - Rochester Hills MI

General Motors Corporation - Detroit MN

H02J 700

320132, 324426

A method and apparatus for determining the state of charge of a lead-acid battery. The present invention includes steps to determine a current-based state of charge while accounting for such factors as current, temperature, charge efficiency, parasitic losses and self-discharge. The present invention is capable of measuring and/or calculating the open circuit voltage during and after operation to determine a voltage-based state of charge while compensating the open circuit voltage for its transient behavior and accounting for the voltage shift caused by charge events. The correlation of the open circuit voltage to the state of charge is dependent on the batterys mode of operation. The present invention is adaptive to battery aging by updating the battery resistance, correcting coulomb errors, and accounting for capacity degradation while in operation.

20130147435, Jun 13, 2013

Dec 5, 2012

13/705753

GM Global Technology Operations LLC - Detroit MI, US
Xie Tao - Troy MI, US
Tao Wang - Oakland Township MI, US
Ramona Y. Ying - Rochester Hills MI, US
Robert S. Conell - Sterling Heights MI, US

GM Global Technology Operations LLC - Detroit MI

H02J 7/00

320127

Methods and systems for depowering a rechargeable battery in a rapid, yet controlled, manner. The methods comprise (i) providing a depowering medium comprising expanded graphite (and optionally, one or more dispersible non-ionic electric conductors) dispersed in a substantially non-ionic aqueous medium; (ii) contacting terminals of the battery with the depowering medium; and (iii) maintaining contact between the depowering medium and terminals for a period of time sufficient to depower the battery. The systems comprise (i) the depowering medium; and (ii) a container configured to receive a battery and the depowering medium such that the battery body is contacted with the depowering medium prior to the terminals.

6356083, Mar 12, 2002

Feb 7, 2001

09/778979

Ramona Y. Ying - Rochester Hills MI

General Motors Corporation - Detroit MI

G01N 27416

324426

A method and apparatus for determining the state of charge of a battery including the steps of determining whether the battery is in a charge decreasing, sustaining or increasing mode, integrating the charge going in and out of the battery to determine a current-based state of charge measurement if the battery is in a charge increasing or sustaining mode, and determining the open circuit voltage to determine an open circuit-based state of charge measurement if the battery is in a charge decreasing mode.

20190308630, Oct 10, 2019

Apr 10, 2018

15/949827

- Detroit MI, US
Ramona Y. Ying - Rochester Hills MI, US
Brian J. Koch - Berkley MI, US

B60W 40/12
B60W 10/06
B60W 20/13
B60W 50/14

A discharge module is configured to determine a change in capacity of the battery between: (i) a measurement of a first open circuit voltage (OCV) of a battery of a vehicle; and (ii) a measurement of a second OCV of the battery. A lookup table is stored in memory and includes reference states of charge (SOCs) indexed by reference OCVs and reference capacities. A relationship module is configured to: from the lookup table, identify a first set of the reference SOCs associated with the first OCV and the reference capacities, respectively; from the lookup table, identify a second set of the reference SOCs associated with the second OCV and the reference capacities, respectively; determine changes in SOC associated with the reference capacities; determine changes in capacity; and determine an equation that relates changes in capacity to capacity based on the changes in capacity and the reference capacities, respectively.

20190143820, May 16, 2019

Nov 10, 2017

15/809316

- Detroit MI, US
Ramona Y. Ying - Rochester Hills MI, US

GM Global Technology Operations LLC - Detroit MI

B60L 11/18
G01R 31/36

A method for predicting power capability of a battery pack in a system includes determining an open-circuit voltage of the battery pack via a controller, calculating pack resistance using measured voltage and current during a charge or discharge event, and calculating a maximum current of the pack using the open-circuit voltage and internal resistance. The method includes selecting the lower of an absolute value of each of the calculated maximum discharge current and predetermined current limit, calculating the discharge power capability of the battery pack using the selected lower absolute value, and controlling a state of the system using the calculated power capability. The method also controls the charging current and parameters during a DC fast-charging operation. A system includes the battery pack, electric machine, and controller. The system may be a vehicle having an electric powertrain, with an electric machine powered by the battery pack.

20140266060, Sep 18, 2014

Mar 13, 2013

13/801987

- Detroit MI, US
RAMONA Y. YING - ROCHESTER HILLS MI, US

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

H02J 7/00

320134

A method for evaluating a battery employed in an application includes calculating a differential voltage during a charging event, evaluating the differential voltage to determine a peak state of the differential voltage, determining a state of charge of the battery based upon the peak state of the differential voltage, and controlling operation of the application in response to the state of charge.