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2s lithium battery protection board active balancing

Overview

Two-string lithium battery protection board with active balancing, over-discharge, short-circuit self-recovery function
Modified from @156135lk's 8.4V@2-string lithium battery protection board active balancing
Attention! ! !
If you need the self-recovery function,
you need to replace the original HY2120-LB with HY2120-OB.
The output MOS tube can be a low-resistance DSOP8 package tube. The tube in the picture is a fake (sad).
Use it with the IP5389 solution of the boss. Two strings and three parallel 18650 are charged at 45w normally.
In addition
, when the protection board is used for the first time, if the battery pack single cell voltage is inconsistent, the board's balancing chip will generate a certain amount of heat when it starts working, and it will basically not heat up in subsequent use.

Design Files

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Update:2025-05-08 06:11:06

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