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I'm "test" charging LiFePO4 batteries. (3.2 volt nominal, 3.65 volt max, 4 in series, 24 in parallel), with a 12 volt lead acid, (car battery), charger. After a complete charge, the parallel groups are 3.4 to 3.9 volts. How can I limit each parallel group to 3.6 volts without a BMS?
I'm fine with simply dissipating any excess voltage over 3.6 volts.
I tried 3.6 volt zener diodes in series with a 10 ohm resistor, plus to negative, but they are not dropping the higher parallel packs down. This method worked on my 12 volt lead acid batteries.
I'm converting my electric truck from 26 lead acid batteries to 26 of these lithium modules. |
August 02, 2018 |
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