I will have two 12awg wires for series connections. Just to be safe, I will have every series connection have 1 bntechgo wire and 1 aliexpress so there is always 1 quality tested wire for each connection. I feel confident that they are the same but I have no experience with this stuff.
Perhaps I can also touch the insulation after the battery is running after setting up the vesc tool and see if they heat up the same? Or can I measure the voltage difference across both series connections and it should be zero as they are both connecting the same two p groups? Or is it better to measure current and they should both split the current equally (be the same) when transferring the energy between p groups?
Iām not sure if Iām wrong about this, but naturally Iām doubting myself. Generally I keep negative commentary to myself as well. I likely should have in this case. Anyway, I criticized a pack posted on the KWeld FB group, specifically the build and welding. It looked fairly rough, and the mention of it being a pack the person made for someone else pushed me to comment.
Am I wrong in thinking that this is sloppy work? Reflecting back on it, I feel like a bit of a prick for saying anything in the first place. But mostly now Iām thinking I could just be actually wrong about the welds on the shoulders and centers. I get really paranoid when I build for other people, so Iām sure thereās a high level of when Iām looking at packs these days.
It definitely isnāt up to snuff for the builds done around here. I donāt think your wrong for raising concern, especially knowing this could be in the hands of someone unsuspecting.
Well speaking of battery blunders, did I totally shit the bed here guys. As I mentioned before I totally forgot to put rings on these cells. The battery cell holders are solid as fuck now and arenāt going to come apart nicely. The Molicel have a plastic isolation ring already under the shrink. Being this is a rigid pack going in an ebike, what are your thoughts on not using rings ?
Looking like you havenāt welded or done anything permanent, so Iād personally wiggle the frame off and take an afternoon to put the rings on. Couple cups of a hot drink and mindless TV that you donāt need to pay attention to, and itās an easy job.
I have never seen any insulation rings on commercial packs like the makitas or Milwaukee power tools if it makes you feel any better.
There is a thick insulation ring there in place under the wrap already.
Yeah, I think this would be fineā¦ the plastic rings in most cells are really sturdy, and the cells being in holders plus the less vibratory environment an ebike is letās me think that this is fine. Just my two cents though.
Also the pack posted above looks like shit, but if itās just sitting around and not moving, also no high amps, its gonna be fine, no? More info on what its for is what is needed to make a good claim if its itās good or nah.
Use-case is everything. I wouldnāt trust that pack in anything that moves, but if itās a powerwall or a back up battery or something, then itās probably fine.
It looks like the enclosure is designed to hold 8 across (perfect for 4P) and I am not sure if there is a good way to maximize the leftover free space with a 3P battery design. Please forgive my ignorance, perhaps this is not as complicated as I am making it out to be.
By far the hardest pack Iāve ever builtā¦by faaaaar, needed to be in that shape and flexibleā¦I donāt think it ever got put to use tho. Looking back at it, I would have done some things very differently
when Iām looking at packs these days.
