[18650] Re: My LiIon Cells - LGQ863448H
- From: "Davide Andrea" <1davide@xxxxxxx>
- To: <18650@xxxxxxxxxxxxx>
- Date: Wed, 18 Aug 2004 09:49:01 -0600
> I could send you 50. Do you want me to go ahead and
> send them to you?
50 is OK, but I am buried right now, so you might as well wait.
(That job that I thought would happen in one month? It's here.)
> And, during discharge, its
> voltage bounced back immediately after the load is removed.
As if there were a high series resistance?
Please see page 6 of:
http://eprints.soton.ac.uk/338/01/draft_sent_in_2.pdf
Davide
----- Original Message -----
From: "Edward Ang" <EdAng@xxxxxxxxxxxxx>
To: "Davide Andrea" <1davide@xxxxxxx>
Sent: Tuesday, August 17, 2004 2:28 PM
Subject: My LiIon Cells - LGQ863448H
> Davide,
>
> I finally got a chance to measure the current draw on my scooter. It has
a
> 30A fuse. But, max current measured is about 20A. This is about twice my
> expectation. I have always used 250W max. Apparently, it is 250W
cruising
> at max speed. When accelerating, it is able to draw closed to 500W.
>
> In this case, I will need at least 13 cells in parallel to keep it under
2C
> rate. 13 x 7 = 91. I only have 150 cells. I would not be able to send
you
> half as I thought. I could send you 50. Do you want me to go ahead and
> send them to you?
>
> Also, I did some charge/discharge tests on a single cell. It was very
> interesting. The most interesting part is that its voltage stayed at 4.2V
> (at full charge) even after I stop charging it. And, during discharge,
its
> voltage bounced back immediately after the load is removed. No slow
rising
> or dropping of voltage like we see on Lead Acid. This got me thinking
about
> hybrid pack again. This behavior make doing a hybrid pack much easier. I
> pasted the voltages below for a possible hybrid pack. Also, we might be
> able to use small automotive starter batteries. They are cheap. And,
with
> this system, they should die first before the LiIon.
>
> Standing Discharging Charging
> VL VH VL VH VL VH
> # of LiIon Cell 46 46 46 46 46 46
> LiIon cell 3.5 4.1 3 4.1 3.6 4.2
> Liion Pack 161 188.6 138 188.6 165.6 193.2
> Per PbA (13) 11.5 13.47 9.86 13.47 11.83 13.8
>
> I attached the spec for these cells. Also, this page contain actual test
> data of various LiIon cells.
> http://www.definity-systems.net/Transportation/EV/efficiency/Li-ion/
>
>
> Ed Ang
>
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