Some lithium batteries are equipped with BMS, other with PCM.... Have they same function? Or what is the difference?!? Does one include the other? I'm confused.
jumpjack
Both of the terms can mean anything. The only way to know is to see what the actual features are. PCM may mean a weak top balancer circuit which tries to ensure that the cells come up full at the same time so that by carefully controlling the charging voltage, no overcharging takes place. BMS may mean that in addition, there is cell-level monitoring that automatically cuts charger power if any cell gets full before others, and cuts the load if any of the cells gets empty before others. These features are hard to integrate into a monolithic block, especially if these blocks are going to be connected in series.
A PCM is a BMS for a small battery (one cell or few cells) that includes a bidirectional protection switch and is mounted directly to the cells.
It means "Protection Circuit Module". (Not terribly descriptive, I know.)
BMS is a general term, which encompasses (by my count) 8 different types of BMSs.
It means "Protection Circuit Module". (Not terribly descriptive, I know.)
BMS is a general term, which encompasses (by my count) 8 different types of BMSs.
And, sometimes PCM = simple top-balancer.
It boils down to the fact that any term can mean anything. Just make sure that the specific system you are buying does what you want it to do.
It boils down to the fact that any term can mean anything. Just make sure that the specific system you are buying does what you want it to do.
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