I purchased the cells directly from CALB in California.
I have a Lithiumate Pro BMS and follow CALB's recommendations. Charge to
3.60 if I need every bit of range, but usually charge to 3.50. Rarely go
below 3.00 at rest. 3.10 at rest is considered 80%DOD. The BMS calculates
the cell internal resistance in real time. There is 2:1 or 3:1 difference
between lowest and highest, that tells you that quality control is nil.
Early on I would smell a strong electrolyte odor in the battery box. I know
that is not right, I could not tell if one cell was leaking or many. If
going above 80%DOD or below 20%DOD causes faster deterioration, then you
would have to oversize your pack by quite a lot and keep it within the 80-20
range. I guess the OEM's are doing this.
Al
----- Original Message -----
From: "David Nelson" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Monday, April 21, 2014 1:47 AM
Subject: Re: [EVDL] self-discharge of CALB 180Ah LiFePO4 cells
Al, what voltage range did you use your cells at? What was max voltage
and what was the charging current at that voltage? What was the
minimum voltage at rest? I ask because I have kept my cells between 3V
at rest and no higher than 3.5V under 0.001C charge rate for most of
their life and I'm not seeing what you are seeing. My cells are TS
cells manufactured 9-2009 and have been in service since 1-2010.
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