Voltage detection and equalization control circuit and detection equalization method for double batteries

By using dual-battery voltage detection and equalization control circuits in the dual-cell battery power supply system, and using control chips and MOS tubes to control battery discharge and compensation, the problem of battery cell voltage mismatch is solved, and the battery life is extended and battery life is improved.

CN119891440APending Publication Date: 2025-04-25XIAMEN CHIPSUN SCIENCE & TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411990591.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2025-04-25

AI Technical Summary

Technical Problem

In a dual-cell battery power supply system, there are different leakage currents or current consumption between the cells of each battery, which leads to an increase in the voltage difference during the charging and discharging process, resulting in a decrease in battery life, and the risk of overcharging the battery cell, affecting the product life.

Method used

A voltage detection and equalization control circuit for a dual battery is adopted, including a battery BAT1, a BAT2, a first and a second control module, and a control chip U5. The control chip U5 controls the conduction and shutdown of the MOS tubes Q5 and Q6, and forms a discharge and compensation loop, sampling and compensation battery voltage, reducing energy loss, and equalizing battery voltage.

Benefits of technology

It effectively reduces the energy loss of the sampling circuit to the battery, slows down the attenuation rate of the battery, improves battery life, avoids the battery cell overcharge, and extends the service life of the product.

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Abstract

The invention relates to the field of battery control, in particular to a dual-battery voltage detection and equalization control circuit and a detection equalization method, and the circuit comprises a battery BAT1, a battery BAT2, a first control module, a second control module and a control chip U5. The positive electrode of the battery BAT1 and the negative electrode of the battery BAT2 are electrically connected with the other end of the first front-end unit; a first control end of the control chip U5 is electrically connected with a grid electrode of the MOS tube Q6, and a first sampling compensation end of the control chip U5 is electrically connected with the other end of the first rear-end unit; the first control end of the control chip U5 controls the on-off of the MOS tube Q6, the first sampling compensation end of the control chip U5 sets a high level, power supply + 5V voltage is output, the battery BAT1 is charged through the first rear end unit, an internal parasitic diode of the MOS tube Q6 and the first front end unit, and the voltage difference between the battery BAT1 and the battery BAT2 is reduced.
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