https://www.youtube.com/watch?v=c7PGLFgkdf4&t=2s&ab_channel=DamianRene!
I have been thinking about a SPC (safe parallel connection) video that I saw on the eskate builders page and at first I loved it and I thought it was genius! But now I’m thinking it has some issues…
I made a fake battery pack out of much safer AAA’s showing the series and parallel connections. My understanding is that the whole point of the design is to protect against internally shorted cells so I replaced one of the cells with a wire. In theory SPC is supposed to solve this problem by braking the small Nickle strip “fuse” and keeping the battery safe but it does nothing about the series connection on the + and - sides of the dead cell. I believe this will cause an imbalance of voltage between the series cells. The upper right cell would be at lets say 10.8V if these were Lion and the upper left cell would be at 7.2v. I think the 10.8v cell will act almost like a charger and push a missive amount of current into the 7.2v cell to try and equalize the voltage. this will then cause the next parallel ‘fuse’ to brake up the line. I think this will continue to happen going up the battery pack until the line of series cells with the dead cell is completely severed from the pack? Or the next fuse doesn’t blow and it over charges the cell above the dead one causing a fire?
Also how would you terminate the ends of the pack to your bus bars? That can’t be made out of fuses or it just will instantly fail when you use the pack for the first time.
Does anyone else know what I’m talking about this has been driving me crazy?