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:
Feb. 24, 2015
Filed:
Oct. 18, 2011
Rengaswamy Srinivasan, Ellicott City, MD (US);
Michael H. Butler, Dayton, MD (US);
Bliss G. Carkhuff, Laurel, MD (US);
Terry E. Phillips, Ellicott City, MD (US);
Jeremy D. Walker, Washington, DC (US);
Oscar M. UY, Baltimore, MD (US);
Andrew C. Baisden, Silver Spring, MD (US);
Rengaswamy Srinivasan, Ellicott City, MD (US);
Michael H. Butler, Dayton, MD (US);
Bliss G. Carkhuff, Laurel, MD (US);
Terry E. Phillips, Ellicott City, MD (US);
Jeremy D. Walker, Washington, DC (US);
Oscar M. Uy, Baltimore, MD (US);
Andrew C. Baisden, Silver Spring, MD (US);
The Johns Hopkins University, Baltimore, MD (US);
Abstract
Methods and systems to determine an internal temperature of a rechargeable lithium-ion cell based on a phase shift of the cell. Internal cell temperature may be determined with respect to an internal anode temperature and/or an internal cathode temperature. Internal anode temperature may be determined based on a phase shift of a frequency within a range of approximately 40 Hertz (Hz) to 500 Hz. Internal cathode temperature may be determined based on a phase shift of a frequency of up to approximately 30 Hz. A temperature sensor as disclosed herein may be powered by a monitored cell with relatively little impact on cell charge, may be electrically coupled to cell but housed physically separate from the cell, and/or may monitor multiple cells in a multiplex fashion. A rate of change in phase shift may be used to initiate pre-emptive action, without determining corresponding temperatures.