Battery Vehicle Society

I have assembled the balancer leads now and connected them all together on an interface board. This forum isn't allowing me to post any more photos, so here's a link to Flickr http://www.flickr.com/photos/28496053@N04/13011898075/ Now that all of the 'layers' within each of the 4 packs is connected ...

I left a 125a pack on around 4amps for a number of hours, and I guess that was just too much for the cell that was shorted. It was effectively taking down the cells in the parallel layer around it at a low rate but when a higher current was passed through it it just gave up and made a great heat so...

I have some fuses coming for the balancer leads, but not for each of the cells. Had to refresh my knowledge regarding failure current and breaking current. I've selected devices suitable for 300A breaking current and 10A failure. The cell which 'exploded' due to a screw being misguided when I fixed ...

fakes always appear. I remember reading of an imported EV from china that reportedly had several sets of batteries fail - so the purchaser decided to chop open a battery and found that half of the lead plates were missing and there was sand in the bottom to make up the weight !!!! They probably con...

Really ? :lol: He hated my battery monitor design, when I requested ideas for an acronym for it he suggested 'B.O.M.B', because as far as he was concerned all battery fires had begun with a BMS. But he wasn't prepared to distinguish between a voltage monitor and a balancer at that time. I'm going to...

I just caught up with Jehu Garcia's episode 25, where he got a real world test of his 18650 battery. http://www.youtube.com/watch?v=EO04IynWNAg (detail starts at about 10 minutes) Very encouraging. He has 150 cells in parallel, I have 84 in parallel. My system voltage is much lower than his but my b...

Just waiting for a few more microcontrollers to arrive and I'll have the full pack voltage monitoring system built and ready to spit out data to a suitable host interface with a display. I've made up the harnesses that will connect all pack submodules together toa remote junction box. This will have...

Yes there is a natural balancing within each submodule of 21 cells. I hadn't considered the idea of paralleling each submodule with the equivalent module in another finished battery pack. I suppose that could work quite well actually ! Four 21-cell modules in parallel equates to 84 parallel cells. I...

I've had a contact from a battery company in the far east, if anyone is interested. They can weld tabs to each cell for a further $0.35 per per cell Good day to you!How about you? This is betty from Brillipower.We are so glad to know you from the Internet. We are a professional factory manufacturing...

17 days later....and the four packs are complete ! :D Only one is fully charged and balanced, but it will be enough to start playing about for now. I'm working out a scheme for a balancer system based on the 'flying capacitor' method, where the cell with the highest voltage charges a capacitor, whic...