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:
Apr. 10, 2001
Filed:
Nov. 09, 1999
Steven Hoenig, Staten Island, NY (US);
Patrick M. Rudai, Clifton, NJ (US);
Thirumalai G. Palanisamy, Morristown, NJ (US);
Harmohan Singh, Rockaway, NJ (US);
Other;
Abstract
A method and apparatus for diagnosing the status of a battery having high and low voltage plateau states corresponding to its state of charge in which the battery open circuit voltage is measured (S,) to determine its voltage state and its internal resistance also is measured (S,). A battery having a low voltage state (S,) is tested to determine if its internal resistance is greater than a predetermined maximum resistance (S,) and if it does the battery is considered as possibly having a low electrolyte level, and if it does not the battery is subjected to a current ramp test to determine from the voltage response a point of current transition (S,) due to a battery chemical gassing reaction. The battery state of charge (S,) is determined from curves or algorithms of state of charge versus current transition. Each of a battery of high voltage state (S,) whose internal resistance is less than the maximum internal resistance and one whose internal resistance is greater than the maximum internal resistance and has been subjected to reconditioning by applying successive current pulses (S,, S,) to reduce its internal resistance is subjected to a current ramp test (S,) to determine the point of current transition and the state of charge of such battery is determined (S,) from a different set of curves or algorithms of state of charge versus current transition. Capacity of a battery of the two voltage state types is determined by charging it to its capacity (S,), applying a current ramp (S,) to determine the point of current transition and determining capacity from curves or algorithms of battery capacity versus current transition (S,).