Systems and methods for estimating battery system parameters

US10288692B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Patricia M. Laskowsky · Ann Arbor, US
• Patrick Frost · Novi, US
• Raghunathan K · Troy, US
• Brian J. Koch · Berkley, US
• John E. Novak · Dexter, US

Key dates

• Filing date: Jun 15, 2015
• Grant date: May 14, 2019
• Expiry date: Jun 17, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T90/40
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

System and methods for estimating a relationship between a SOC and an OCV of a battery system included in a vehicle are presented. In certain embodiments, an initial relationship between an open circuit voltage (“OCV”) and a state of charge (“SOC”) of a cell of the battery system may be determined at a beginning of life of the cell. Changes in one or more stoichiometric points of a half-cell of the cell may be determined as the cell ages. Based on the determined stoichiometric point changes of the half-cell, an initial relationship between the OCV and the SOC of the cell may be adjusted to generate an updated relationship between the OCV and the SOC of the cell.