Forgot to add in the specifications. See specifications below:
----- Original Message -----
From: Roland via EV<mailto:[email protected]>
To: EVDL Administrator<mailto:[email protected]> ; Electric Vehicle Discussion
List<mailto:[email protected]>
Sent: Friday, October 10, 2014 5:26 PM
Subject: Re: [EVDL] Need Lithium batteries.
If you just type in your search engine - hybridautocenter.com - you will get
to the main page.
Then click EV PARTS SHOP
These batteries are from as Hybrid Auto Center.
The cell specifications is:
Cathode Material - LiMn2O2 with LiNi
Anode Material - Graphite
Rated Capacity 33.1 ah per cell
Added specifications:;
Average voltage 3.8V
Maximum charge voltage 4.2V
Recommend to only charge to 95% of the maximum voltage of 4.2 voltage for a
longer life. Do not shut off charger above 95%, taper or lower the current
first than turn off the charger like it is done with a lead acid battery.
Use a BMS system that can interface with the charger that first lowers the
charge ampere first before it shuts down, otherwise you will damage the BMS and
maybe some cells.
I using a PFC-50B charger that does not have interface with the BMS,
therefore I have to program it to stop charging at the acceptance voltage of
about 95% of the rated maximum voltage and dial the timer to taper the current
until the State of Charge does not go over 100% with the time out I selected.
I am a old geezer which my fingers may type something else other than I was
thinking. I started in the electrical with my father in 1944, so that will
tell you how old I am.
Roland
----- Original Message -----
From: EVDL Administrator via
EV<mailto:[email protected]<mailto:[email protected]>>
To: Electric Vehicle Discussion
List<mailto:[email protected]<mailto:[email protected]>>
Sent: Friday, October 10, 2014 1:16 PM
Subject: Re: [EVDL] Need Lithium batteries.
On 10 Oct 2014 at 11:12, Roland via EV wrote:
> These are the batteries from the Hybrid Auto Center that I am going to
use.
Did you mean to include a link in your post? The word "these" doesn't seem
to refer to anything. :-(
> four cells each connected two in series and then two in parallel for
> a voltage of 4.2 volts per cell or 8.4 volts maximum per modules at 66
> a/h each ... Each module weighs just over 8 lbs.
I assume that by a/h you mean amp-hours, or AH. (A/H would be amperes per
hour, a meaningless unit.)
If so, that would be 554Wh per module. Eight lbs is 3.6kg, for a specific
energy of 154 wh/kg. Pretty impressive!
> NO, These are not Chinese batteries that some are having problems with.
> Made by the Toyota Company which I think that had the license right
> from GM back in 1993 when they held the patent on them. The patent
> ran out in 2013 which Toyota is now producing kits to change there
> hybrids to EV.
Now it sounds like you're talking about NiMH batteries. But the specific
energy above (154 wh/kg) is more than double that which is normally
available from NiMH (70 wh/kg).
Also, unless I missed something, NiMH cells are around 1.2 volts nominal,
and most lithium chemistries are around 3.2 to 3.5 volts per cell. The
voltage you state above doesn't match any of those. Perhaps you could
explain more clearly what batteries plan to use.
Thanks, looking forward to hearing more.
David Roden - Akron, Ohio, USA
EVDL Administrator
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