llile
1 kW
- Joined
- Dec 18, 2010
- Messages
- 457
I'm helping a guy who has been building a little electric truck out of a small Toyota pickup. He's using a 120VDC Li-Fe-PO4 pack made out of prismatic cells very similar to this one in appareance, probably 60 AH or 100 AH.
Well, it's bad news, his project has been sitting around for a few years and it looks like the cells have been overdischarged. I'm getting 200 mv across each cell. If this were LiPOs I would have already junked them, but it's Lithium Iron Phosphate for certain.
So my question is:
1. Is it safe to try to charge them at all?
2. We might just pull one cell and attempt to charge it (in a metal box? outside?). If so, any recommendations on a charge protocol? we could set up basically any CC and voltage profile needed.
3. What are the odds that the cells could be revived, even if they have severely damaged cycle capacity?
Well, it's bad news, his project has been sitting around for a few years and it looks like the cells have been overdischarged. I'm getting 200 mv across each cell. If this were LiPOs I would have already junked them, but it's Lithium Iron Phosphate for certain.
So my question is:
1. Is it safe to try to charge them at all?
2. We might just pull one cell and attempt to charge it (in a metal box? outside?). If so, any recommendations on a charge protocol? we could set up basically any CC and voltage profile needed.
3. What are the odds that the cells could be revived, even if they have severely damaged cycle capacity?