Title:
STATE OF HEALTH EVALUATION OF RETIRED LITHIUM-ION BATTERIES AND BATTERY MODULES
Document Type and Number:
WIPO Patent Application WO/2022/261994
Kind Code:
A1
Abstract:
A used battery is discharged for a short time from a first Open Circuit Voltage (OCV1) to a second OCV2 and the discharge current ΔQ measured. OCV1 is input to a calibration curve model to obtain a first modeled State of Charge (SOC1) value, and OCV2 is input to the calibration curve model to obtain a second modeled SOC2 value. The State of Health (SOH) is calculated as ΔQ/ [Q new x (SOC1–SOC2) ], where Q new is the battery capacity when new. The used battery is sorted for reuse or disposal based on the SOH value. The calibration curve model is obtained by Artificial Intelligence (AI) modeling of OCV, SOC datapoints from fully charging and discharging used batteries. Only OCV values within a target region having a low first derivative of SOC as a function of OCV are modeled, and OCV1 and OCV2 are within this target region.
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Inventors:
XU MINJIE (CN)
SUN YAOFENG (CN)
SUN YAOFENG (CN)
Application Number:
PCT/CN2021/101217
Publication Date:
December 22, 2022
Filing Date:
June 21, 2021
Export Citation:
Assignee:
HONG KONG APPLIED SCIENCE & TECH RESEARCH INST CO LTD (CN)
International Classes:
G01R31/378; G01R31/367; H01M10/44
Foreign References:
| CN111381178A | 2020-07-07 | |||
| CN110501652A | 2019-11-26 | |||
| CN111308374A | 2020-06-19 | |||
| US20070194756A1 | 2007-08-23 |
Attorney, Agent or Firm:
CHINA TRUER IP (CN)
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