Planing CanView and BMS+ conversion with lithium

Lets see that " THAT" doesn't happen

 

o well A123 systems already lost the contract for the volt so i can blowup lots of A123 pouches ;-)

no indeed lets make that NOT happen .

i got some pot. meters and resistors for the current control
they where out on pot meters of 10k ;-( i got some 4.7k POT. and 5,6k res. to make ~10,3K ) and a 4,7resistor................... damm i needed a 10k.... Sh%i@#t forget that... ( wil this stil work? )

damm store is closed next week due to stuppid CARNAVAL...grgrgrgrrgg

anyway also got the crimp plugs for the 16mm2 cabling inside my battery case so i can make the serie's connecting that will and my life at +242 DC volts.

so i hope to finisch that today and hoppefully do a first test charge ( with the to high endvolatge of 292 volts ) and see how that go's

 

no meltdown yet.
no evacuation zone
did a first charge, 2 cells went up in voltage to fast so I needed to stop.
I hope these are not bad cells.

discharing them now.

the current control works fine with the 4k7 pot and a 5k6 in series with it.

I put a switch so with one flip I go from max current to 200 mAmps.

 

continue the discharge of those 2 cells today after I pickup a seats and sofa chair ;-)
hope I do a fullcharge today to see what the higher end voltage Will do to me cc and cv curve

 

How about some pictures?

 

to busy
i am posting on t he fly using CONVO ( powered by tapatalk ) on my phone

 

those cellogs are worthless... 3 of them just blanked out on me . needed to reconnect... that's not save

 

ok this is not working
its painstaking

5 cells when at 3.4 go up fast to 3.5 and after that its really fast to 3,7 buth al other cells are still at 3,335 and around that.

bleeding needs to start at 3,5 or 3,4 not any later.

have no way of testing if the charger is good because of the highend voltage 292 volts..

how did you guys balance? if I keep at 200 mA bleeding then it will take days to top balance at this rate with the 5 cells getting full that fast....maybe I have 5 bad cells? strange I got them from the same person as you did....

 

I've heard several people mention strapping all cells in parallel for ~24 hrs to get an initial balance, but don't know if there is anything more to it than that.

 

Maybe the cellLogs are dodgy. My miniBMS balances just fine. The A123 cells are delivered discharged to different levels. Should find that no cell has a capacity lower than 18 ah. I found when getting my new A123 cells that I had to manually balance my cells using a 48v 3amp variable DC power supply which speeded up the balancing process when charging low cells with 3 Amps. You can just charge one cell or a group of cells to bring them up. Initially I charged a group of 10 cells until one cell reached 3.6v then I charged other cells or groups of cells until eventually all reached 3.6v.

Otherwise charging cells at 100mA to reach 3.6v will take forever to do.

 

Which my miniBMS does. Your balancer is not that well matched to your A123 cells.

 

I would definitely recommend miniBMS. It's reliable, and handles monitoring as well as top balancing. OK so 72 cells worth may be expensive ($912), but I think, worth it.

 

only Mr plugin is using the celllogs for charging? Mmmmmm wanted to read before that its needed to manual bring the cells up before I connect the cells inside the battery pack.
I only have a 5 amps 3.2 volts life charger to do that.

buth I found a load where I can bring down those cells fast.
buth they then go up again rapedly.

a minibms at 1000 is almost the same price as a Orion bms with a load of more possibiliys.

damit
can not test the charger this way and it needs to go back end of this week if I am not happy.

the bleeding board maybe adjustable
I need to find out what resistor is needed to tell the ic to start bleeding sooner.

 

in post #426
you say someting else

 

Hi Everybody,

I am a new guy from Europe.
As I see the easiest way to make a diy plugin prius to use:
BMS2
72 pieces of Li cells (20-40-x AH) (CALB-Winston-A123)
BMS for Li cells
Elcon PFC charger

I would like to start with few questons:

1, How can we measure the additional (not oem) battery pack, if we use cheap bms?
2, could we change the oem pack with Li pack?
3, Where could I buy A123 20Ah from Europe the avoid TAX?

Thank you

 

Welcome to the club. Good to see another member.

 

BMS2 is on the list ;-)

what part of the EU are you from?

planitaire and myself are the 2 EU's at this moment.

 

from Hungary

I would like to ask how could we measure the SOC, if we use a cheap BMS (which not contains SOC support)