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:
Mar. 17, 1998
Filed:
Dec. 20, 1996
Boris Tsenter, Rosswell, GA (US);
Total Battery Management, Inc., Georgia, PA (US);
Abstract
An apparatus and method of recognizing a shunt caused by formation of dendrites in a rechargeable lithium battery which comprises charging the battery with a charging current, sampling the charging current voltage of the battery at pre-determined time intervals in order to identify one or more point indicating onset of shunting, and terminating charging if the shunt or dendrite is indicated. If a shunt is not recognized charging is continued. Dendrite formation or the beginning of shunting due to such formation is indicated by any one of the following conditions: a negative gradient in sampled voltage values; a negative gradient in sampled steady open circuit values; and a negative gradient in the chemical polarization voltage values which may be calculated by sampling both the open circuit voltage soon after current interruption and steady open circuit voltages during a plurality of currentless phases.