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:
Aug. 23, 2011
Filed:
Apr. 08, 2009
Anil Paryani, Cerritos, CA (US);
Scott Ira Kohn, Redwood City, CA (US);
Brian Boggs, Menlo Park, CA (US);
Andrew David Baglino, San Francisco, CA (US);
Craig Bruce Carlson, Los Altos, CA (US);
Anil Paryani, Cerritos, CA (US);
Scott Ira Kohn, Redwood City, CA (US);
Brian Boggs, Menlo Park, CA (US);
Andrew David Baglino, San Francisco, CA (US);
Craig Bruce Carlson, Los Altos, CA (US);
Tesla Motors, Inc., Palo Alto, CA (US);
Abstract
A method for accurately estimating battery capacity based on a weighting function is provided. The disclosed system monitors battery current and uses the monitored battery current to calculate the state of charge (SOCbyAh) of the battery. The system also measures the open circuit voltage (OCV) of the battery when the system is at rest, rest being determined by achieving a current of less than a preset current value for a period of time greater than a preset time period. The state of charge of the battery is calculated from the OCV (SOCbyOCV). The weighting function is based on ΔSOCbyAh and ΔSOCbyOCV, where ΔSOCbyAh is equal to SOCbyAhminus SOCbyAh, and where ΔSOCbyOCV is equal to SOCbyOCVminus SOCbyOCV. The weighting function also takes into account the errors associated with determining SOCbyAh and SOCbyOCV.