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:
Dec. 02, 2025
Filed:
Mar. 24, 2022
Chaojiong Zhang, College Station, TX (US);
Chaojiong Zhang, College Station, TX (US);
Abstract
A difference voltmeter (DVM) is used in a battery testing apparatus for determining values of open-circuit voltage, self-discharge, self-discharge rate and internal resistance of batteries. A reference voltage Vref is generated. A difference OCV relative to Vref is determined at times tand tas ΔOCVand ΔOCV. The SD for a battery is determined as (ΔOCV−ΔOCV), and the SDR is determined as SD/(t−t). The IR of a battery is determined by measuring voltage at two levels of direct current and calculating IR as equal to (ΔV−ΔV)/(I−I). The smaller FSR of the DVM allows a more accurate measurement of OCV, which allows the time for determining the SDR to be reduced.