State of charge error estimation of battery cells background

US11585859B2 · kind B2 · utility

Assignee

• CHONGQING JINKANG POWERTRAIN NEW ENERGY CO., LTD. · CN

Inventors

• Wenke Zhang · Burlingame, US
• Saeed Khaleghi Rahimian · Santa Clara, US
• Jun Hou · Corning, US
• Brennan Campbell · Santa Clara, US
• Ying Liu · Santa Clara, US

Key dates

• Filing date: Mar 1, 2019
• Grant date: Feb 21, 2023
• Expiry date: Dec 22, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y04S30/12
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Embodiments described herein generally relate to the modification of State of Charge (SoC) calculations within electric vehicles (EVs). A database of data points may be generated based on characteristics of a battery cell at various measured SoCs within a controlled environment. Subsequently, during the operation of an EV, a battery management system (BMS) within the EV may collect various operating data points. The collected operating data points may be utilized to reference similar data points stored in the database in order to determine an SoC value. The SoC value may be utilized to modify or alter the SoC calculations by the BMS for an EV in operation.