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:
Jan. 26, 2021
Filed:
Mar. 23, 2018
GM Global Technology Operations Llc, Detroit, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method for determining a state of charge (SOC) of a rechargeable battery cell includes determining a rate-invariant charge/discharge relationship between an open-circuit voltage (OCV) and a state of charge (SOC). This includes a first finite-rate voltage scan following a reduction branch of a relationship between OCV and the SOC, and executing a second finite-rate voltage scan following an oxidation branch of a relationship between OCV and the SOC. A rate-dependent charge/discharge relationship between the OCV and the SOC is determined during scanned voltage transitions between the reduction and oxidation branches. A present SOC state is determined based upon an electrical potential, the rate-invariant charge/discharge relationship between the OCV and the SOC, and the rate-dependent charge/discharge relationship between the OCV and the SOC during a voltage-scan reversal that occurs when the scanned voltage transitions between the reduction and oxidation branches.