Lithium ion battery based on overdischarge protection and performance repair method thereof

CN122246311APending Publication Date: 2026-06-19XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD
Filing Date: 2026-03-27
Publication Date: 2026-06-19

AI Technical Summary

Technical Problem

Lithium-ion batteries suffer irreversible performance loss after over-discharge due to the dissolution of copper current collectors, damage to the SEI film, and changes in the structure of the cathode material. Existing technologies lack effective active diagnosis and repair methods, resulting in high maintenance costs and resource waste.

Method used

By combining material optimization and electrochemical repair strategies, the degree of over-discharge is identified through the diagnostic module of the battery management system. Mild pre-charging at 0.01C-0.05C and restorative cycling at 0.1C-0.2C are used to form LiF and LixPOyFz protective films, rebuild the SEI film, and homogenize the lithium-ion distribution.

Benefits of technology

It extends battery life, reduces maintenance costs, avoids safety accidents, improves battery repair efficiency and reliability, and ensures quantitative assessment of battery health status.

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Abstract

This invention discloses a lithium-ion battery based on over-discharge protection and its performance repair method. The method includes: when the battery management system detects that the battery voltage is below a first safety threshold, initiating an over-discharge diagnostic program to analyze the battery's voltage response characteristics to determine the degree of over-discharge; performing a gentle pre-charge at a current of 0.01C-0.05C on mildly to moderately over-discharged batteries, utilizing the gentle slope effect of low current density to ensure uniform and smooth deposition of dissolved copper ions on the current collector surface, preventing copper dendrite formation and rebuilding the SEI film; then performing a restorative cycle at a rate of 0.1C-0.2C to stabilize the interface structure; finally, evaluating the repair effect through capacity recovery rate, internal resistance growth rate, and constant voltage charging time changes. This invention combines material system optimization with an electrochemical repair strategy, achieving active repair of over-discharged batteries while mitigating over-discharge damage, extending battery life, and reducing maintenance costs.

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