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Building a NiCd battery pack | 6 comments (6 topical, 0 editorial)

Re: Building a NiCd battery pack (3.00 / 0) (#5)
by Bruce S (bruce(dot)stahl <at>gmail (dot)(com)) on Fri Sep 12th, 2008 at 07:37:12 AM MST
(User Info)

Slingshot;
I will add a little to what Zap said. I have found that to keep cross cell problems to a minimum, it's best to match the cells as best as possible, then like he did watch them to make sure they become a cohesive pack.
By completely charging the set as an entire pack, then using them , then recharging the packs as a whole , helps the entire set become a "one" set pack . Rather than charging the packs as individual packs then having them used , will certainly lead to imbalances.
When these packs are tested at our office they go through a very structured testing.
When I built the packs up for our 48V e-bike they were then retested as a single pack. For us there has not been any problems yet.
So far I've built 2 packs doing this, one pack of 36Vdc rated at 32Ahr & the most recent pack being 48Vdc rated at 16Ahr. Both are still going strong . The first pack is now 2 years old the last being less then 4 months.

Hope this helps;
Bruce S

[ Parent ]

Re: Building a NiCd battery pack (3.00 / 0) (#6)
by zap (bell47g5a at comcast dot net) on Fri Sep 12th, 2008 at 11:24:47 PM MST
(User Info)

One thing I forgot to say was that keeping the paralleled parts (and the pack as a whole) symmetrical goes a long way towards keeping the charge on all cells level.

If I was only pulling 500ma out of the pack I wouldn't worry much at all. Depleting the pack in a half hour is probably pushing things a bit too much... hence the reason I've been watching the pack closely for now.

zap
[ Parent ]

Building a NiCd battery pack | 6 comments (6 topical, 0 editorial)

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