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Re: CALB CA series cell performances
Posted: Thu Aug 02, 2012 4:14 pm
by Beemer
GregsGarage wrote:Beemer wrote:The best monitor for safety and life is not voltage but temperature!
Sorry, can't agree with you on this point. Temperature is important, but in most cases cell voltage readings will highlight a problem long before temperature does. For example, I couldn't find any mention of abnormal temperature readings during John's testing when the headway cell failed. Voltage readings are instant, waiting for a component to get too hot takes time depending on it's thermal mass.
Like trying to charge ones car while freezing cold? It will surely over volt, only locally heat. Then burn down.
An overcharged cell is a warmer cell. An non-bottom balanced cell that hit reverse voltage is a hot cell.
A simple circuit to say, an Elcon charger who's "off" & current limiter line is used to current limit on temperature.. Nothing else is needed to stop the charge when cold. Or something gets inordinately warm, (Could be only the weather). Nothing else because the correct charger does not allow over volting and bottom balancing does not allow any cell to hit reverse voltage. Racks of open circuits that get damaged from so much as throwing in a damp towel are not sensible.
Thermal mass also equates to AH. The only difference is the small stuff hits the fan much more quickly.
Still off topic
Re: CALB CA series cell performances
Posted: Thu Aug 02, 2012 6:46 pm
by mattcarr
Let me add to this - excessive heat is only generated by a cell when it is used outside of it's paramters. If you suck too high a current out of a cell then it will heat up. But if that cell is cold then the voltage will sag dramatically when cold - so you should only draw the ampage out that keeps the cell above it's minimum working voltage. If you charge a cell and let it go over it's maximum voltage then it will start to generate heat. So in my believe the voltage is the most important factor to consider when managing a cell. Keep the cells within the manufactures specified limits and it should last.
Re: CALB CA series cell performances
Posted: Thu Aug 02, 2012 7:01 pm
by Beemer
mattcarr wrote:Let me add to this - excessive heat is only generated by a cell when it is used outside of it's paramters. If you suck too high a current out of a cell then it will heat up. But if that cell is cold then the voltage will sag dramatically when cold - so you should only draw the ampage out that keeps the cell above it's minimum working voltage. If you charge a cell and let it go over it's maximum voltage then it will start to generate heat. So in my believe the voltage is the most important factor to consider when managing a cell. Keep the cells within the manufactures specified limits and it should last.
Absolutely!
But off topic
Re: CALB CA series cell performances
Posted: Sun Mar 10, 2013 1:11 pm
by Kevin Sharpe
Any recent updates on CALB CA cells?
Re: CALB CA series cell performances
Posted: Sun Mar 10, 2013 2:57 pm
by Beemer
Not heard any news myself yet but...
I hear Sinopoly have gone back to selling cells outside of China, via dealers.
Re: CALB CA series cell performances
Posted: Fri Mar 29, 2013 5:23 pm
by Kevin Sharpe
Re: CALB CA series cell performances
Posted: Tue May 28, 2013 11:38 am
by Beemer
Absolutely!
The easiest and quickest for the UK. Good reports from Anne (we must pronounce his name as "Onne"). He personally specialises on electric boats. Being in the Amsterdam area with power sockets aplenty at mooring points, we can't blame him!
He has a slot on Jack Rickards EVTV these days. Here's a bit of what he does:-
http://www.youtube.com/watch?v=we2eh2Zh ... _X-Y8l_QmQAnd here's a bit where Anne's going, sexy hardware and is up to:-
http://www.youtube.com/watch?v=4AMuXitZ ... _X-Y8l_QmQOf course I suggest watching all the video. Some amazing stuff coming down!
For the self builder. a note about these new CALB CA cells; the 130AH appears only to exist on paper!!
Re: CALB CA series cell performances
Posted: Tue May 28, 2013 2:18 pm
by Kevin Sharpe
Beemer wrote:The easiest and quickest for the UK. Good reports from Anne (we must pronounce his name as "Onne"). He personally specialises on electric boats. Being in the Amsterdam area with power sockets aplenty at mooring points, we can't blame him!
I hope to visit Anne on route to/from the
WAVE... if anyone has any questions for new electric then let me know
Re: CALB CA series cell performances
Posted: Thu Jun 20, 2013 12:17 pm
by Beemer
Young, brave and wacky Anne's certainly inboard with EVTV now. He's donated a couple of interesting film slots.
http://newelectric.nl/http://wh.newelectric.nl/
Re: CALB CA series cell performances
Posted: Thu Mar 27, 2014 10:59 pm
by Beemer
CALB have a new player on the block. It's a small cell in size but somewhat bigger on price. The energy/volume density has set new ground.
The start is here.
http://youtu.be/gZsW-uxWje4?t=39m30sThe outcome is 60% of the volume and 80% of the weight saving of the standard CALB CA series cell. Totally super duper for say an electric motorcycle, or a drag vehicle (20C discharge rate).
Not the energy density weight of Teslas 18650 cells but will last a sight longer than any production cars cells if your system does not overcharge or over discharge them.
