The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 2015
Filed:
May. 25, 2012
Patricia M. Laskowsky, Ann Arbor, MI (US);
Brian J. Koch, Berkley, MI (US);
Damon R. Frisch, Troy, MI (US);
Ramesh Rebba, Rochester Hills, MI (US);
Kurt M. Johnson, Brighton, MI (US);
Patricia M. Laskowsky, Ann Arbor, MI (US);
Brian J. Koch, Berkley, MI (US);
Damon R. Frisch, Troy, MI (US);
Ramesh Rebba, Rochester Hills, MI (US);
Kurt M. Johnson, Brighton, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method for modeling changes in the state of charge vs. open circuit voltage (SOC-OCV) curve for a lithium-ion battery cell as it ages. During battery pack charging, voltage and current data are gathered for a battery cell. A set of state equations are used to determine the stoichiometry and state of charge of the cathode half-cell based on the charging current profile over time. The voltage and current data, along with the stoichiometry and state of charge of the cathode half-cell, are then used to estimate maximum and minimum solid concentration values at the anode, using an error function parameter regression/optimization. With stoichiometric conditions at both the cathode and anode calculated, the cell's capacity and a new SOC-OCV curve can be determined.