Battery Vehicle Society

3 full packs completed now :D The one on the left in these pictures is still being charged module by module with a hobby RC charger at 2.5A. The modules take about 32Ah before they come up to 4.2V and then another 4 to 6Ah as the current falls from 2.5A to 0.02A This last pack will be clad in the sa...

A bit more detail about the termination/terminal method I'm using.

The first pack has been clad now, and reliable terminations have been added. The cladding is a high temp thermoplastic sheet which I had lying around. It's fixed to the cell holders by screws which screw into a carefully drilled pilot hole into a gusset between cells in the holders. I'm glad the pac...

Some more info..... Each 210-cell pack measures (before enclosing) 310mm x 285mm x 70mm. For 925Wh at 37V. I've weighed the motor and controller (and some short interconnecting cable)at 29kg combined Total weight so far, for the 3.7kWh 18650 pack + motor + controller = 72kg. I've designed the layout...

An attempt to weigh one of the four packs on the bathroom scales says they're 10kg on their own. Then , weighing myself first holding the pack in my arms and then subtracting my weight, the scales read just under 10kg. (bathroom scales aren't too accurate at the bottom end of the range usually, but ...

I wasn't sure this time would actually come a few weeks ago, but happy to have finished assembling all 4 packs. The three laying down are being charged by the open frame variable supply on top (below the Fluke meter), I'm slowly bringing them up to 41V. After 41V has been reached I'll stop and check...

The second pack has come together nicely, and I'll soon be starting the assembly of the two remaining packs. I'm starting to think that unless I'm careful I'll have an accident, because the packs are quite flexible as a result of me not locking each of the packs ten modules together (to enable easy ...

Thanks Matt, yes the small voltage drop does look promising. I'm looking around in the garage for a suitable load, and I have an old milklfloat motor, rated for 72V, at about 15HP. Hopefully it will draw 20-30 Amps continuously at 37V, or something in that ballpark, to give me something to check the...

The submodule which continued to be charged overnight is still taking current this morning, at 370mA (4.2V), and the total capacity charged so far is a little over 35Ah. The cells were not completely discharged before I started this charge cycle (they had a standing voltage of 3.74V as a pack) , the...

Jehu Garcia released the awaited Ep 24 , but unfortunately the weather once again got the better of him. http://www.youtube.com/watch?v=R7ufhAgzI6w I've been charging the individual modules this week but because I've been busy with my day job it has been very ad-hoc and I wasn't taking many measurem...