#Lithium battery welding

The creator introduces the AWithZ compact spot welder UF20B: supercapacitor inside, lighter and smaller than a traditional transformer welder, with big instantaneous power and high efficiency; the nameplate gives max output current 1750A, output power 10.5kW, input 100–240V. It comes with two welding pens (very thick leads), a switch for auto / manual, and a trigger port for a foot switch. In the test: gear 15 welds nickel strip onto a cell’s negative end — the welds look clean with no blackening, can’t be pulled off by hand, and pliers tear the nickel strip apart; switching to thick nickel strip at gear 28 on an old cell’s positive end is just as solid, the strip tears before the weld; dozens of welds in a row with no problem. Summary: 99 gears to choose from, suits nickel strip of different materials and thicknesses (up to 0.4mm), with over-temperature and discharge protection. In the comments the creator replies that a higher-power model that welds 1mm is in the shop window.

The creator picks up an AWithZ UF20B (AWithZ focuses on spot welders; a must-have for repair / DIY): main unit, manual, power cord, welding pen and a free roll of nickel strip. Neat finish, cooling fan at the rear, a slot on the base so it also cools when stood upright; max output current 1750A, officially rated for 0.15mm copper strip and 0.4mm nickel strip. On power-up the screen shows the AWithZ logo and the internal supercapacitor charges first, done in moments; long-press to power on, short-press the power key to switch settings; the trigger port takes a foot switch, set to foot-pedal mode. The default gear 05 is on the low side, max is 100; after welding nickel strip the welds are bright as new with no blackening, and pulling on the strip tears the strip while the welds hold tight. Key point: a higher gear is not a stronger weld — too high burns through and wrecks the strip and the weld is actually weaker; like a soldering iron’s temperature, right is right. Commenters ask for a ‘gear vs nickel strip thickness chart’.