Quote:
Originally Posted by bronsonj
I balance manually now. I do have a BMS but have not installed it. I purchased a different charger so I no longer have the issue of charging to over 60v.
Actually, I have two of the Chargery BMS modules but I really want to have a quick disconnect method to detach the BMS. I've heard that a BMS failure isn't uncommon (not brand specific, any BMS) and when a BMS module fails the most common failure is to fail in the balancing/discharging state, so it would put a continual load on a single cell until it bricks that cell. This is my first foray into lithium powered vehicles, so I am going off only what I've read.
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Biggest concern is not around overcharging the entire pack, but around cells getting out of balance and being pushed beyond operational limits. Depending on how well your cells are matched, that may be a minor or a major concern, which a good BMS would address.
BMS failures are common for BMSes coming from aliexpress :) If you go with a serious vendor, it's not really a concern. Note that shunt balancing (resistor) is typically the approach in cheaper BMS systems. Serious automotive BMSes do active balancing, where energy in a cell with higher voltage is dumped into a cell with lower voltage, so bricking a cell like you're describing isn't possible by design.
I started having an issue with my Chargery charger which is only 1 month old, it keeps going to "connect break" state even though there is a proper connection to individual battery. After reading that other report about their charger, I wouldn't trust them with managing my pack.