Hi!
Im amateur trying for long operational lifetime LiFePO4 DIY ESS. so i could be very misinform!
Increase in ability to repeatedly connect and disconnect the terminals vs tapped aluminum, that feels like a real gain to me.
however, the reduction in surface area going to the pedestal does make me less inspired.
one person did some practical tests, and posted temperatures. if i find it, will link.
anyways, 0.3C continuous discharge seems like it might be what i try to target, based on reading about the purported self heating of these type of cell.
temperature of cell material drives calendar aging strongly, so contact resistance is extra undesirable imo.
may i ask, is it only the surface area holding you back?
went forward with 12 of these large format cells with stainless steel studs, and in person, the connection surface area look so puny and i would not want to run >100A through it without rigorously checking each connection's temperature
increased torque tolerated by stainless steel stud kinda offsets the surface area, but i dislike needing to try on sustained super tight connector, although of course will use nylon lock fastener even though they throw torque observation off a bit. me want larger surface area And strong connector!
have consider the mg-847?
Resistivity of 23 Ω.cm Improves electrical connections between irregular, pitted or corroded surfaces Ensures electrical contact between loose or vibrating parts Prevents arching, pitting, hotspots and welds Inhibits corrosion Fills gaps Can be used on vertical surfaces Silicone-free
www.mgchemicals.com
water is not included in it as far as i'm aware
View attachment 78161
to quote their material
https://www.mgchemicals.com/downloads/tds/tds-847.pdf datasheet
i dont actually see it say that there is no h2o in it. dunno!
interesting, thank you for sharing. i have not worked with carbon fiber around graphite or aluminum. the mg-847 paste seems to clearly claim that it improves the conductivity and long term stability of connections, i wonder how the chemistry works with the grease in the mix. i have no long term testing data from using that carbon assembly paste, and plan on using it on upcoming build of 300Ah style cells with stainless steel threaded terminals to promote long term happy conduction time. as well, using crimped lugs for flexible connection of like two or three 6awg fine strand tinned copper silicone jacket conductors eg very flexible.
anyways i heard many of these class cells heat up a lot past 0.3C current with order of 10-30W internal heating and more as approaching 1C, which drives aging, so i will probably shoot for continuous 0.3C or ~100A or ~320 Watt per cell. so 1,280 W for 4 cell pack which is pretty low compared to what many people here do?
annnnyyways rambled enough, maybe i should stop typing and start building!