[RE-wrenches] Lithium Iron Cell recovery

[Jay]

Hi Mac

I guess my question would how did this happen and why wouldn’t it happen again?
 It would seem the balance system didn’t work or isn’t working?
And I don’t know what kind of issues that could cause going forward. 
I guess I’d be cautious about what could happen 

I have heard from a few people about relion batteries absolutely blowing up. No fires but total destruction. 

Jay


> On Jan 9, 2025, at 9:26 AM, Mac Lewis via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
> 
> 
> Hey Wrenches,
> 
> I am working on recovering a Lithium Iron Phosphate cylindrical cell battery that has about 5 years of cycling on it.  We didn't install this system but they have 2 x Relion RB48V300 paralleled at a telecomm site.
> 
> They are a pretty simple battery, just in a box with no easy way to pull data unless you have some programming knowledge beyond what I have.  We found that one bank of the series cells was sitting at 0.9V, probably for about a month or so.  It was in parallel with another battery so it may have been longer.
> 
> We were able to get it slowly charged up and the battery has cycled well a few times in the shop, we have been able to easily pull about 90% of the nameplate out without the cell dropping and getting BMS shutdown.  Are there any concerns (safety mainly) with reinstalling this unit?  
> 
> It is matching the voltage of the other cell banks nicely now.  No real difference in temperatures either.  Any other tests we should do?
> 
> Thanks!
> 
> 
> 
> --
> 
> 
> 
> Mac Lewis
> 
> "Yo solo sé que no sé nada." -Sócrates
> 
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