US 11,656,291 B2
Fast screening method for used batteries using constant-current impulse ratio (CCIR) calibration
Minjie Xu, Hong Kong (HK); Liya Zheng, Shenzhen (CN); and Yaofeng Sun, Hong Kong (HK)
Assigned to Hong Kong Applied Science and Technology Research Institute Company Limited
Filed by Hong Kong Applied Science and Technology Research Institute Company, Limited, Hong Kong (HK)
Filed on Feb. 8, 2021, as Appl. No. 17/169,675.
Prior Publication US 2022/0252674 A1, Aug. 11, 2022
Int. Cl. G01R 31/392 (2019.01); H02J 7/00 (2006.01); B07C 5/344 (2006.01); G01R 31/367 (2019.01); G01R 31/3828 (2019.01); G01R 31/3842 (2019.01)
CPC G01R 31/392 (2019.01) [B07C 5/344 (2013.01); G01R 31/367 (2019.01); G01R 31/3828 (2019.01); G01R 31/3842 (2019.01); H02J 7/005 (2020.01); H02J 7/0068 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for screening a battery for reuse or disposal comprising:
(a) charging the battery with a constant current until a battery voltage reaches a voltage threshold;
(b) multiplying a value of the constant current by a Constant-Current (CC) time period during which the constant current is applied to the battery to reach the voltage threshold to generate a constant-current charge value that is stored in a computer memory;
(c) after the voltage threshold is reached, charging the battery with a constant voltage until a variable current applied to the battery voltage reaches a current threshold;
(d) integrating a value of the variable current over a Constant-Voltage (CV) time period that the constant voltage and variable current are applied to the battery to reach the current threshold to generate a constant-voltage charge value that is stored in the computer memory;
(e) generating a Constant-Current Impulse Ratio (CCIR) by dividing the constant-current charge value by a sum of the constant-current charge value and the constant-voltage charge value;
inputting the CCIR to a calibration function processor that outputs a modeled State of Health (SOH) value that corresponds to the CCIR input to the calibration function processor; and
using the modeled SOH value to classify the battery for reuse when the modeled SOH value is above a SOH threshold, and to classify the battery for disposal when the modeled SOH value is below the SOH threshold.