Method for dividing charge and discharge of secondary battery, battery management system and battery pack including same

The method addresses the challenge of accurately estimating SOC in lithium iron phosphate batteries by maintaining constant charging and discharging sections through voltage and capacity-based termination, effectively addressing premature discharge termination and capacity deterioration issues.

JP2025507379AActive Publication Date: 2025-03-18LG ENERGY SOLUTION LTD
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Patent Information

Application Number
JP2024547742
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-10-28
Filing Date
2023-10-27
Publication Date
2025-03-18
Estimated Expiration
2043-10-27

AI Technical Summary

Technical Problem

Lithium iron phosphate batteries face challenges in accurately estimating the state of charge (SOC) during divided charging and discharging due to plateau sections, leading to potential premature termination of discharge before reaching the intended SOC.

Method used

A method for maintaining constant charging and discharging sections during divided charging and discharging of lithium iron phosphate batteries, where charging ends when the measured voltage reaches a reference voltage, and discharging ends when the discharge capacity reaches a value calculated by multiplying the charged capacity by Coulomb efficiency.

Benefits of technology

This approach ensures that the charging and discharging sections remain constant, accurately reflecting capacity deterioration over charge/discharge cycles, thereby maintaining the integrity of the battery's charge/discharge interval.

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Abstract

The split charging / discharging method of the present invention is a method for charging and discharging a secondary battery in a charge state range of SOCa to SOCb, and includes a charging process for charging the secondary battery and a discharging process for discharging the secondary battery charged by the charging process, and is characterized in that such charging and discharging processes are repeated, and the charging process ends when a measured voltage value of the secondary battery reaches a charge end reference voltage, and the discharging process ends when a measured discharge capacity reaches a value obtained by multiplying the capacity Qc charged in the charging process by the Coulombic efficiency. (However, a
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