Cell impedance of Thundersky and CHL lithium battery

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CHL lithium battery
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The yellow cell is Thundersky, The green cell is CHL,all 40AH capacity,of course,bigger capacity always less impedanceresistance 1.JPG
resistance 1.JPG

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CHL lithium battery
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Re: Cell impedance of Thundersky and CHL lithium battery

sorry,forget to upgrade the yellow cell
yellow resistance.JPG

CHL lithium battery
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Cell impedance data of all kinds 40AH lithium battery

Who else have other brand battery data,pls upload here so that we may compare each other.

antiscab
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Re: Cell impedance data of all kinds 40AH lithium battery

have you tested CALB (formerly Sky Energy)?

0.3mOhm is very good!

how does that tester measure the internal resistance?

is it AC resistance?
or is it measuring actual voltage sag while drawing two or more different amps?

at 90% state of charge (so full charge with 4Ah removed), what does the voltage sag to at 145A?

my thundersky 2010 manufacture date cells sag to 3.04v @ 145A when only 4Ah removed (1.76mOhm DC resistance)

what physical dimensions are CHL 40Ah cells?
what is its mass?

Matt

__________________

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah
Vectrix 60Ah Lithium Tyres Fuel Registration Insurance cycle analyst replacement TC Charger
conversion
Spent so far: $5800 + $7000 + $1720 + $960 + $320 + $720 + $140 + $600
Cost to do it again: $2500 + $5600 + $1720 + $960 + $320 + $720 + $140 + $600
Cost for a Petrol bike:$6000 + + $1440 + $6000 + $800 + $1400 + $3200 servicing
Total spent: $17260
Total to do again: $12560
Total to have used a petrol bike: $18840
Total distance travelled so far: 79'120km

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Ok,finally we get battery from CALB (formerly Sky Energy),it is better impedance,but too difference between cells,CALB is similar to GBS impedance and better than Thundersky,I think all of them come from the same technology and dosage.

DSC02413.JPG
DSC02411.JPG
DSC02410.JPG

antiscab
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Re: Cell impedance data of all kinds 40AH lithium battery

interesting there was such a wide variation in resistance in the CALB cells.

From what I understand, the manufacturing process is not precise.

The selection process is though,
which is how you can get a matched set of cells from a production process that is imprecise.

were all the CHL cells in your intial post from the same batch, or was a selection process used to match them?
I noted the variation (44.0 to 44.2Ah and 0.29mOhm to 0.31mOhm) to very small.

a variation cell to cell that small means one can get away with just measuring pack voltage halves to detect a failed cell, instead of doing a cell level BMS

What SOC are your cells shipped at? 50%?

Matt

__________________

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah
Vectrix 60Ah Lithium Tyres Fuel Registration Insurance cycle analyst replacement TC Charger
conversion
Spent so far: $5800 + $7000 + $1720 + $960 + $320 + $720 + $140 + $600
Cost to do it again: $2500 + $5600 + $1720 + $960 + $320 + $720 + $140 + $600
Cost for a Petrol bike:$6000 + + $1440 + $6000 + $800 + $1400 + $3200 servicing
Total spent: $17260
Total to do again: $12560
Total to have used a petrol bike: $18840
Total distance travelled so far: 79'120km

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Dear Matt:

Your are very professional, The Battery BORN and SELECTION is more important than BMS.

Normally we picked up from impedance,then capactity and then voltage....

We normally ship at 60% SOC.

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Will anyone show more brand lithium battery impedance here ?

No one want to challenge our quality ?

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Visitors from 6 countries and area at the same day take interesting with our advanced production machine and procedure....they are from Australia,Spain,Germany,Israel,USA and Taiwan....etc
DSCF3467.jpg

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Who has A123 LFP battery and post its impedance here ?

Swenergy
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Re: Cell impedance data of all kinds 40AH lithium battery

I have already use A123 in superbike with 32 cells! :-)
http://www.youtube.com/watch?v=ZtcqEOjbT-Q

proton
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Re: Cell impedance data of all kinds 40AH lithium battery

I have the A123 20Ah cells.
Single 20Ah flat cells measures .56 to .6 milliohms
2 in parallel to get 40Ah shows 0 / Zero milliohms. (My meter only goes down to .01 )
So, we're talking microohms now...
Unfortunately, I am unable to upload these pics here. ( uploader not working ? )
So, here's the link to FalconEV lithium battery page
http://www.falconev.com/batteries.html

each cell's weight is 1 lb
so, 40Ah is 2 lbs / .91kg

What is the green cells weight ?

__________________

The LiFepo4 BattMan www.falconev.com

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

CHL 40ah battery is 1.5kg/cell,all chinese LFP battery are almost the same weight and specification.

I think A123 20Ah flat cells measures .56 to .6 milliohms is very good too,less capacity will naturally be more impedance.

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Anybody have samples from BYD ? it is so famous,but none of us know its data and performance on market.

Swenergy
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Re: Cell impedance data of all kinds 40AH lithium battery

But BYD have Warren Buffet!!!
And you????

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Swenergy wrote:

But BYD have Warren Buffet!!!
And you????

Let's why we are eager to know BYD good battery ! Will anyone do me a favor to show it here ?

Swenergy
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Re: Cell impedance data of all kinds 40AH lithium battery

We want know your battery, not battery from other supplier.
Please, do you have more information or not.
C-rate charge and discharge? Max/continue?
How many cycles 80%DOD at 3c discharge and 1c charge? Do you have this test....or do you want we pay for your batteries, and we make the test....don't jock

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

It is 6C continue discharged,we just do 1C 80% SOD,by now it is 3% drop after 500cycles,more cycle is under testing day and night.

Don't have 3C discharged data..... Sorry !

Swenergy
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Re: Cell impedance data of all kinds 40AH lithium battery

So make also this test....
and what about charge in this 500 cycles? 0,3C, 0,5C, 1c????

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

0.5C charging,1C discharged

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Finally our website come out, www.china-huali.com

since we are focus on chinese E-bus market at the moment,so that we don't have English website,any more questions,you may contact with me directly.

CHL.jpg
here are spcification of our LFP battery !

CHL lithium battery
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Re: Cell impedance data of all kinds 40AH lithium battery

Ok,finally we find the best LFP manufacturer,TCL from china,it is 0.15 mOhm on 40AH batteries,it is a pity that their price is 2 times than CHL

athlon
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Re: Cell impedance of Thundersky and CHL lithium battery

Anyone have experience with GBS battery?

On their website they claim GBS to be 10% better than Thundersky , do you feel is true ?

Johnny J
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Re: Cell impedance of Thundersky and CHL lithium battery

I will be able to tell you in around 5-6 weeks when the scooter I have ordered with CHL 50Ah batteries will arrive.

sangesf
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Re: Cell impedance of Thundersky and CHL lithium battery

What would be the approximate cost of 12 of the CHL 40ah batts to USA?

CHL lithium battery
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Re: Cell impedance of Thundersky and CHL lithium battery

I think it is around 800dollars to west coast and 900dollars to East coast by sea.

CHL lithium battery
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Re: Cell impedance of Thundersky and CHL lithium battery

sangesf wrote:

What would be the approximate cost of 12 of the CHL 40ah batts to USA?

Pls give us detail address including post code,we will check "door to door" cost by air for you.

sangesf
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Re: Cell impedance of Thundersky and CHL lithium battery

33403 postal code
West Palm Beach, FL USA

CHL lithium battery
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Re: Cell impedance of Thundersky and CHL lithium battery

Ok,we got the information from shipping company that the air freight cost of 12 cell battery from china to Miami airport is around 250dollars.

sangesf
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Re: Cell impedance of Thundersky and CHL lithium battery

And the total cost broken down into per cell cost and shipping.

CHL lithium battery
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Re: Cell impedance of Thundersky and CHL lithium battery

40AH is Usd50/cell,12 cell will cost 600dollars,pluse 250dollars airfreight.

Total costs is 850dollars

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