In a previous post with a video showing what happens when you short out a Turnigy lipo pack something kind of bugged me. There were lots of safety precautions taken, but one thing in particular was fairly dangerous in my opinion. It may have not been the smartest thing to do to plug the leads into each other by hand, gloved or otherwise, to make the short. Here’s why:
Basically, it’s a little arc welder. His video actually showed over 1000A going through the connectors, enough to melt the solder (and actually break the circuit). I dunno, but if you’re cool with handling a little arc welder with leather gloves, then god love ya. I’m not. For this demo I had my welding coat, welding gloves, and welding mask on. Not only spark protection, but heat and UV as well.
The one or two times this has happened to me was while wiring these 4s packs together in parallel, then in series, to get a 80V 20ah pack built up. Let’s just say, what with all the balance leads, buss blocks and pack leads, you really have to pay attention to avoid mis-connections. When you make one that happens to be a short, you pretty much find out right away… as the folks on ES say, “Kentucky Fried Fingers”.
I suspect everybody who’s worked with these packs may have experienced something like this… a lipo “plasma event”. Hopefully, it’s one of those mistakes that’s not too much of a catastrophe, but certainly one you can avoid, and probably will once you see what can happen.