Intelligent fast charging method for lead-acid battery based on current threshold control

By combining constant current and constant voltage charging at 0.1-0.3C, and real-time monitoring of the current threshold to control lead-acid battery charging, the problem of balancing charging time and battery performance is solved, enabling fast charging while avoiding overcharging and ensuring battery health.

CN122267329APending Publication Date: 2026-06-23TIANNENG BATTERY GRP (JIANGXI) CO LTD
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Patent Information

Application Number
CN202610180168.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-09
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing lead-acid battery charging methods fail to effectively balance charging speed and battery performance, resulting in excessively long charging times or insufficient charging, and posing a risk of overcharging.

Method used

It uses a preset constant current of 0.1-0.3C to charge to the preset voltage, then switches to constant voltage charging. By monitoring the charging current in real time and using current threshold control, it automatically ends the charging process. Combined with temperature compensation, it adjusts the charging parameters to avoid overcharging or undercharging.

Benefits of technology

Significantly shorten charging time, maintain battery performance, avoid overcharging risks, and achieve efficient balance of battery state of charge.

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Abstract

This invention relates to the field of electrochemical energy storage technology and discloses a smart fast charging method for lead-acid batteries based on current threshold control. Compared to the traditional constant current and constant voltage charging method with fixed time, this method uses a preset constant current of 0.1-0.3C to charge the lead-acid battery, which is faster than trickle charging of less than 0.05C, rapidly raising the battery from low SOC to medium-high SOC and significantly reducing charging time. Constant voltage charging ends when the charging current drops to 1% of the battery's rated capacity, representing the optimal balance between charging efficiency and charging time, avoiding the blindness of traditional fixed-time control. While shortening the charging time, the battery discharge capacity decreases slightly, and the battery cycle life does not decrease significantly, thus fully balancing charging speed and battery performance. The charging process is automatically adjusted according to the actual state of the battery, avoiding overcharging or undercharging problems that may occur with fixed-time control.
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Citation Information

Patent Citations

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  • System and method for charging batteries

    US7528579B2