Fast screening of rechargeable batteries using sectional constant-current impulse ratio (SCCIR) calibration with constant-current followed by constant-voltage charging

US12044737B2 · kind B2 · utility

Assignee

• Hong Kong Applied Science and Technology Research Institute Company Limited · CN

Inventors

• Minjie Xu
• Meng Chen · Zhuolan Township, TW
• Yaofeng Sun · Sha Tin, CN

Key dates

• Filing date: Jan 4, 2022
• Grant date: Jul 23, 2024
• Expiry date: Mar 19, 2043

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/392
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Used batteries are screened based on a measured Sectional Constant-Current Impulse Ratio (SCCIR). A used battery is partially charged over a small voltage range using a Constant Current (CC) until a voltage target is reached, and the current integrated to obtain the CC charge applied, Qcc. Then the battery continues to be charged using a Constant Voltage (CV) of the voltage target until the charging current falls to a midrange current target before the battery is fully charged. The current is integrated over the CV period to obtain the CV charge applied, Qcv. The measured SCCIR is the ratio of Qcc to (Qcc+Qcv) and is input to a calibration curve function to obtain a modeled State of Health (SOH) value for sorting. The calibration curve function is obtained by aging new batteries to obtain SCCIR and SOH data that are modeled using a neural network.