Colonel.lp
New Member
- Joined
- Jun 8, 2020
- Messages
- 135
This question has come up in relation to the welded studs that Chinese suppliers are shipping their Eve & Lischen cells with these days.
It would be great if those of you with more technical knowledge could expand on my limited research (googling)
The welded studs are reported to have a 10mm diameter, with an m6 stud.
Assuming a 6.7mm busbar or connector hole, the effective contact area is about 43mm²
Google tells me that maximum current density for aluminium ranges between 0.5A/mm² a few at 0.7A/mm2 with a couple of outliers saying 1 to 1.5A/mm²
So that gives me anywhere between 21.5Amps to 64.5amps.
Tables for aluminium wire show around 100amps(but I'm aware stranded cables can carry more current)
So what gives? Whichever way I look at this, the rating of these welded studs would appear to be shockingly low for batteries that are rated to supply 280amps.
It would be great if those of you with more technical knowledge could expand on my limited research (googling)
The welded studs are reported to have a 10mm diameter, with an m6 stud.
Assuming a 6.7mm busbar or connector hole, the effective contact area is about 43mm²
Google tells me that maximum current density for aluminium ranges between 0.5A/mm² a few at 0.7A/mm2 with a couple of outliers saying 1 to 1.5A/mm²
So that gives me anywhere between 21.5Amps to 64.5amps.
Tables for aluminium wire show around 100amps(but I'm aware stranded cables can carry more current)
So what gives? Whichever way I look at this, the rating of these welded studs would appear to be shockingly low for batteries that are rated to supply 280amps.