A dual battery power supply management method and circuit

CN119787554APending Publication Date: 2025-04-08SOUTH SURVEYING & MAPPING INSTR
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Patent Information

Application Number
CN202411963122.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-04-08

AI Technical Summary

Technical Problem

The dual-battery parallel power supply design has problems of unbalanced charging and discharging, which leads to a shortening of battery life and safety hazards. When the voltage difference is large, the batteries may charge and discharge large currents from each other, resulting in the risk of thermal runaway.

Method used

By obtaining the real-time voltage of the dual battery and the real-time load voltage of the load device, calculate the battery voltage difference, and control the battery power supply according to the preset pressure difference threshold to ensure that the voltage difference is within a reasonable range and avoid unbalanced charging and discharge between the batteries.

Benefits of technology

It effectively controls the voltage difference between the dual-battery power supply, improves the safety of the circuit, extends the service life of the battery, and reduces the risk of thermal runaway and battery burning.

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Abstract

The present invention relates to the field of battery power supply technology, and discloses a dual-battery power supply management method and circuit, which is applied to the process of a first battery and a second battery supplying power to a load device in parallel, including: obtaining a first real-time voltage corresponding to the first battery; obtaining a second real-time voltage corresponding to the second battery; obtaining the real-time load voltage of the load device; if the first real-time voltage and the second real-time voltage are both greater than the real-time load voltage, then calculating the battery voltage difference between the first real-time voltage and the second real-time voltage; when the battery voltage difference is greater than a preset first voltage difference threshold, determining a high-voltage battery and a low-voltage battery in the first battery and the second battery, and controlling the high-voltage battery to supply power to the load device; when the battery voltage difference is less than a preset second voltage difference threshold, controlling the first battery and the second battery to supply power to the load device in parallel. The present invention can reasonably control the voltage difference between power supplies and improve the safety of the circuit.
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