You could go for the copper braid option however I decided to use the battery bars from technobots as I was ordering several other parts at the same time.

I soldered my 8 cell pack together, put wiring on then covered all the cell ends with tape. I laid this onto a piece of foam which was then laid onto a plate of titanium longer than the pack. I heatshrunk some of the yellow 100mm stuff from technobots over the whole lot and attach using some holes in the titanium strip.

If you want a really good guide for soldering these cells then take a look at Johns page (cheers John! saved me a lot of hastle!)

http://www.terrorhurtz.com/a123/