Methods, devices, equipment and storage media for detecting DC impedance of batteries

By applying a discharge current pulse during the constant current charging process of a lithium-ion battery, a negative pulse charging mode is formed, and the battery's DC impedance is detected in real time. This solves the problem of not being able to continuously monitor the battery aging trend in existing technologies, and achieves higher accuracy in battery aging state identification and improved charging efficiency.

CN116802507BActive Publication Date: 2026-07-03CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2022-08-15
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies cannot continuously monitor changes in DC impedance during the use of lithium-ion batteries, making it difficult to identify battery aging trends. Furthermore, traditional testing methods are performed separately before leaving the factory, which cannot meet the accurate testing requirements of batteries during use.

Method used

Multiple discharge current pulses are applied during the constant current charging process of lithium-ion batteries to form a negative pulse charging mode. By obtaining the battery voltage difference and capacity ratio, the DC impedance is calculated. Combined with the battery temperature and capacity mapping relationship, the battery aging status can be detected in real time.

Benefits of technology

It improves the accuracy and precision of DC impedance detection for lithium-ion batteries, enabling the identification of battery cell aging during charging, shortening charging time and improving charging efficiency.

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Abstract

This application provides a method, system, device, and storage medium for detecting the DC impedance of a battery. By applying multiple discharge current pulses during the constant current charging process of the battery to form a negative pulse charging mode, a discharge current can be added during the charging process to quickly remove the polarization effect generated by the battery cell during charging, thereby improving the battery cell's charge acceptance capability, shortening the charging time, and increasing charging efficiency. Simultaneously, a first battery voltage is acquired during the discharge current pulse period, and a second battery voltage is acquired during the constant current charging period following the discharge current pulse. This allows for the determination of the battery's DC impedance value during actual charging and use. The DC impedance DCR of the battery cell can be detected simultaneously under the negative pulse charging mode to identify the current aging state of the battery cell. Compared to the DC impedance DCR detection value before leaving the factory, its accuracy is greatly improved.
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