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Ben Goren via EV wrote:
I am curious as to how Paul came to his belief.
His methodology is inadequate to the task -- rather like using a
roadside truck scale to weigh the first four people to pass by and
concluding that all humans weigh exactly 200 pounds.
Lee, in comparison, is akin to a
I haven't seen any science from BMS advocates yet. They make lots of
assumptions based on nothing.
Besides I have a BMS I just don't have a cell level BMS.
I haven't heard the theory on self discharge yet?
Or the rate at which they discharge or an example of someone putting one on the
shelf
Paul,
It appears that you are not learning from experience and data that is shared
with you,
so I am going to stop responding to your posts. I have shared that I have a
pack of
used LiFePO4 cells in my garage and I have measured its self discharge and I
have seen
the cells go down towards zero
Bill,
I have dug through many scientific papers on Li batteries and how they
work and I haven't been able to find anything about a theoretical
self-discharge mechanism. I have found some explicitly talking about
the lack of a charge shuttle mechanism like in lead-acid batteries,
however.
One
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David,
Here is a paper describing the chemical and physical mechanisms inside a Li-Ion
cell
that cause self-discharge. Happy reading!
http://www.che.sc.edu/faculty/popov/drbnp/WebSite/MSA-calendar.pdf
Regards,
Cor van de Water
Chief Scientist
Proxim Wireless
office +1 408 383 7626
On 19 Jun 2015 at 23:00, Michael Ross via EV wrote:
Self discharge would be where the capacity has not decreased, but the
amount available in the cell is less - very hard to measure accurately the
actual charge level with normal DIY instrumentation when the change is small.
Did you read Lee
On 19 Jun 2015 at 14:48, Cor van de Water via EV wrote:
I have tried to give input and set some of your claims straight, but I
need to stop investing my time because I judge that it has become a
waste of time since you appear not to listen to correction.
Cor, please remember that you're not
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For EV drag racing discussion, please use NEDRA
(http
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For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
I can say the same about you. You may have had some cells drop but not all or
even most. All they papers I quote are from scientific journals or NASA
presentations.
I read the complete design of the Boeing APU battery and even read about the
company who designed their charger burning down the
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Did actually read it?
That paper is about capacity loss not voltage drop over time.
Sent from my iPad
On Jun 19, 2015, at 7:58 PM, Cor van de Water via EV ev@lists.evdl.org
wrote:
David,
Here is a paper describing the chemical and physical mechanisms inside a
Li-Ion cell
that cause
Paul,
I'm not following you, here. How can you have 4v open circuit applied
to anything? You could measure 4v open circuit across a power supply
or, for that matter, a disconnected battery. But, I thought, the
moment you connect it to something, you no longer have an open circuit.
http://www.bloomberg.com/news/articles/2015-06-18/mattel-rolls-out-hot-wheels-tesla-model-s-for-fans-big-and-small
Mattel Rolls Out Hot Wheels Tesla Model S for Fans Big and Small
by Dana Hull Matthew Townsend June 18, 2015
[image
http://assets.bwbx.io/images/i7_6OfcBTNQI/v2/-1x-1.jpg
The
http://moneyweek.com/london-electric-cars-green-transport-trend/
London’s electric ‘love-mobiles’ are a transport trend you can’t ignore
By: John Stepek 11/06/2015
[image / © Getty Images
http://moneyweek.com/wp-content/uploads/2015/06/150611-electric-cars.jpg
Electric cars in Paris London
% Still only half-powered 3kW level 2, and no level 3 charging %
http://thechronicleherald.ca/wheelsnews/1292035-smart-ev-is-perfectly-‘safe’-fortwo
smart EV is perfectly ‘safe’ fortwo
Richard Russell | June 9, 2015
[image
Cor van de Water via EV wrote:
I would be very surprised if DeWalt does not have a BMS on their Lithium packs,
all power tool packs with Lithium that I have opened always come with a BMS
which both checks every cell and turns off any current flow above max and
under min voltage levels.
The
/That is a reason I don't use a cell level BMS. With a cell level BMS like
the miniBMS there is a constant drain on the cells running the BMS boards
and it is nearly impossible to make sure that each board uses the _exact_
same current regardless of voltage in the cell./
The constant drain is
Cor van de Water via EV wrote:
I have Lithium cells (CALB 180Ah) sitting in my garage since 1.5 years
and have measured their self-discharge and plotted it in an Excel spreadsheet.
I can *see* their self-discharge.
I can *see* effect from ambient temperature on the change in self-discharge
On 06/19/2015 10:58 AM, Lee Hart via EV wrote:
Cor van de Water via EV wrote:
I have Lithium cells (CALB 180Ah) sitting in my garage since 1.5 years
and have measured their self-discharge and plotted it in an Excel
spreadsheet.
I can *see* their self-discharge.
I can *see* effect from ambient
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On 06/19/2015 11:58 AM, Ben Goren wrote:
On Jun 19, 2015, at 9:33 AM, Willie2 via EV ev@lists.evdl.org wrote:
I am curious as to how Paul came to his belief.
His methodology is inadequate to the task -- rather like using a roadside truck
scale to weigh the first four people to pass by and
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This zero self-discharge myth seems to be a common thread with the
anti-BMS crowd. I don't know where this misinformation comes from.
All cells have self-discharge. It is just a matter of degree. Also,
the self-discharge varies from cell to cell. That's why you need a
BMS. These are
Cell
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