With spot welding and copper on the brain, I’ve got some more thoughts.
This welding flux allowed my welder to use 20% less power, to achieve solid, and wider welds on 0.2mm copper, 0.1 nickel plated steel sandwich.
Wider diameter welds should have less resistance.
Less welding power should mean less heat entering the cell, oxidizing the electrolyte less.
The flux has tin and nickel inside of it, perhaps some other powdered metals too… The syringe of it weighs far more in hand than I expected
When I tore off the welds, and cleaned the remaining flux off with 91% rubbing alcohol, the copper immediately adjacent to the welds was silver, as if tinned.
I didn’t notice if the sikvry tinning was also bonded to the cell as well. I’d think so.
Sorry the picture is bad. My phone sucks at macro photos.
Will remedy and repeat.
Since the copper or nickel strip next to welds is not perfectly flat, spreading contact amongst a larger surface area, this silvery ‘solder’ layer right next to the weld, should increase the contact between cell and copper or nickel strip, further reducing electrical resistance.
I know my skate is low power compared to most builds here.
I’m not even coming close to the CDR of my BAK45D cells.
I did not need to go tabless.
My first esk8 battery did not need 0.1mm copper nickel sandwich, or 10awg and XT90s, but it got it. My second and third got the same.
My 4th is on the bench. 10s1p of EVE 40PL, and now I can weld 0.2mm copper.
Did you just hear maniacal laughing off in the distance?
I hope to get the small Eve pack sending juice to a Pair of OG Focboxes, powering the Puaida hub motors. My previous forays with vesc tool did not go well. I’ve no confidence, only reluctance regarding vescs and vesctool.
In theory I could have the lightweight mini build’s enclosure populated wiith focboxes eve 40pl 10s1p and velcro cinch strapped to my long cruiser relatively quickly. Heck I should at least be testing the motors on the bench, in the AC, using my semi retired 10s2p dmegc 26e pack feeding the focboxes. Ill know if they sound right. They never did on the Fsesc 6.6mini, and then sounded.worse when test riding.
I dont know how much more power the motors can handle heat wise. The 2*12 battery amp Puaida/Lingyi says 40-45 phase amps max(per motor?), and the motors get me towing Fiona upto 25mph, in Flat Florida with no headwind, and when solo, I’ve exceeded 30mph, and do not feel the need to do that again.
I do want a back up board soon.
My long flexy cruiser is a bit of a pain bring in to the store.
Not gonna ride the lightweight mini kicktail with the EVE focbox powertrain until it proves itself strapped to the long cruiser first.
I want to take Fiona Kayaking again, but the water looks pretty nasty with all the rain, and there are reports of Vibrio Vilnificus, flesh eating bacteria infecting people in Tampa. That same bacteria which nearly killed Fiona last year about this time when it got into her mammary. That now excised mammary.