3S5P Li-Ion battery with BMS and Boost converter - can I charge thru the Boost Converter

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Ozchuck

Joined May 22, 2020
2
I am building a battery for my golf buggy to replace a lead-acid one. The motor controller is designed for the lead-acid battery that has an o/c voltage of around 13.6V whereas the Li-Ion battery is 12.5V or less. After a few hours the controller sometimes sees the lower Li-Ion battery voltage as being too low and cuts out under load such as going up a hill. I am incorporating a boost converter to boost the o/c voltage to say 13.6V so the controller won't cut out. My question is can I connect a battery charger straight to the output terminals of the boost converter or do I need to connect to the output side of the Battery Management System (BMS) PCB.
 

Dodgydave

Joined Jun 22, 2012
9,089
The charger goes to the BMS pcb, that will control the battery charging.

I would be looking at altering the low voltage sense , it's probably a couple of resistors across the battery to feed a micro or comparator.
 
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