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BM3451 3-cell battery protection board

Overview

This is a direct copy of the BM3451 [Four-Series Lithium Battery Protection Board] - JLCPCB EDA Open Source Hardware Platform (oshwhub.com) original author, with modifications to the LED section. The number of MOSFETs has been reduced to two, and the current sensing resistor has been changed to 10mΩ.
The maximum current calculation method is 0.1V/R18=Imax.
Overcharge and over-discharge protection voltages should be selected according to the datasheet. This project uses the BM3451BHDC-T28A as the main chip, for lithium iron phosphate batteries.
Overcharge protection is 3.65V,
over-discharge protection is 2.35V,
maximum current (200ms) is 10A (default),
maximum current (20ms) is 30A (default),
and short circuit protection is 600us (maximum).
Please solder the battery pack according to the board's instructions:
1 is total negative , 2
is the first series positive
, 3 is the second series positive,
and 4 is total positive.
To achieve a full 10A current, please add more solder!

Design Files

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Update:2026-03-24 14:21:17

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