flippy said:please cancel that order as fast as humanly possible.jonescg said:So I have ordered a Sunkko 709 AD
that thing is nothing but grief.
Taswegian said:Whats the problem with the early K-weld?
I have a relatively recent one and although I've only done a few test welds so far it seems to perform exactly as advertised, ie works great!
Not that much of acceptable, here we have a "nickel" fuse link that must heat up to 1500C to blow, OP is calculating nice cool conductor.No_Shorty said:Thanks, that makes sense.
Is that 'acceptable' the same as the 'acceptable' in the OP, so for example 0.1mmx5mm = 3A acceptable?
I would use them in application with 3A peak load per cell and trying to operate<2A/cell.
Nice video.No_Shorty said:He tests them under a thermal camera, and at 3a they keep a pretty stable 55deg f, which seems to basically be ambient. It blows at around 8-9a and at 626f.
As fuse maybe. Do not forget, loses will grow exponentially, at 6A you will deal with 0.042V droop and 0.252W in loses. Usually packs are enclosed, links are not open air and only way to cool is to push heat in to the tab and cell tab adding to cell heating from internal resistance.No_Shorty said:this 1mm wide strip seems to be perfectly acceptable at 3A
What I mean is, his thermal camera reading have no value if they show 626F nickel melting temperature.No_Shorty said:Thanks for your thoughts, I agree that if the fuse blows it may damage the plastic - but if this happens the whole battery needs tearing down and cell replacing in any case.
Be careful with fuse wire material, Tesla uses some special fuse material, which has high electrical conductivity, low melting temp and low heat conductivity.No_Shorty said:I may simply cop the 'Tesla' method and weld an actual fuse wire to each cell and then to a bus bar.
KarlJ said:OK guys so i've just built a B52 Bomber battery 22S10P using LG MJ1 3500 mAh cells
i've used 5mm wide 0.2mm thick solar panel bus tape - its tinned copper.
scotchbrite the tops/bottoms of the cells and tinn them with solder and 80W iron, takes less than a second using fairly heavy gauge solder.