This might be a better question for the battery forum, but I thought, possibly, the answer could be dependent on the application, so since we're generally pretty demanding on batteries, I'm asking here.
I've been reading more about battery building, and also getting more experience using lipos, so while poking around, came across these "active equalizers" that look like are used in addition to a BMS. They start balancing whenever there is a 0.1 V difference between the highest and lowest cell/cell group. The inter-cell current transfer in the examples is 1.5A, and finishes balancing when the highest and lowest are 0.03 V apart. Supposedly the losses are really low.
Thinking out loud, I'm not sure what the maximum difference the unit could handle. If a pack has a weak cell, but is initially balanced, how much greater is the voltage sag contribution of the group that cell is in, relative to the healthy ones, when we're pulling high currents?
I was looking at the connectors on the board, and it looks like my lipo balance leads would plug right in. I also see they go up to 16S but I saw in the Q&A that they can be daisy chained, too. Plus, 16S means it can be used with anything up to 16S. If they work, then adding it to my pack would allow charging up to any level without ever having to worry about balancing. Any thoughts?
https://www.amazon.com/Li-ion-Lifepo4-Battery-Equalizer-Balancer/dp/B07XD824JS/ref=cm_cr_arp_d_product_top?ie=UTF8&th=1
https://es.aliexpress.com/item/4000812177140.html?src=google&albch=shopping&acnt=494-037-6276&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&albagn=888888&albcp=9765122064&albag=101238896618&trgt=892975210062&crea=en4000812177140&netw=u&device=c&albpg=892975210062&albpd=en4000812177140&gclid=EAIaIQobChMIo6rwxLnd6wIVJQnnCh1jBQ56EAQYCCABEgK-AfD_BwE&gclsrc=aw.ds
I've been reading more about battery building, and also getting more experience using lipos, so while poking around, came across these "active equalizers" that look like are used in addition to a BMS. They start balancing whenever there is a 0.1 V difference between the highest and lowest cell/cell group. The inter-cell current transfer in the examples is 1.5A, and finishes balancing when the highest and lowest are 0.03 V apart. Supposedly the losses are really low.
Thinking out loud, I'm not sure what the maximum difference the unit could handle. If a pack has a weak cell, but is initially balanced, how much greater is the voltage sag contribution of the group that cell is in, relative to the healthy ones, when we're pulling high currents?
I was looking at the connectors on the board, and it looks like my lipo balance leads would plug right in. I also see they go up to 16S but I saw in the Q&A that they can be daisy chained, too. Plus, 16S means it can be used with anything up to 16S. If they work, then adding it to my pack would allow charging up to any level without ever having to worry about balancing. Any thoughts?
https://www.amazon.com/Li-ion-Lifepo4-Battery-Equalizer-Balancer/dp/B07XD824JS/ref=cm_cr_arp_d_product_top?ie=UTF8&th=1
https://es.aliexpress.com/item/4000812177140.html?src=google&albch=shopping&acnt=494-037-6276&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&albagn=888888&albcp=9765122064&albag=101238896618&trgt=892975210062&crea=en4000812177140&netw=u&device=c&albpg=892975210062&albpd=en4000812177140&gclid=EAIaIQobChMIo6rwxLnd6wIVJQnnCh1jBQ56EAQYCCABEgK-AfD_BwE&gclsrc=aw.ds