K2 Energy Power Modules

[EVDragRacer]

K2 LFP 42 AH 3.2 Volt Module (LFP 165S 41.6AH Power Module)
16 - 2.6AH cells (26650P) in parallel.
2400 amps Burst Rating!

K2 LFP 73 AH 3.2 Volt Module (LFP 300HPS 72.8AH Power Module)
28 - 2.6AH cells (26650P) in parallel.
4200 amps Burst Rating!

http://www.k2battery.com/products-26650P.html

http://batteryworkshop.msfc.nasa.gov...App_JHodge.pdf
______________________________________________________________

I am researching new battery producers because we are building a second EV Drag Funny Car!
This is not the Haiyin sponsored car, this car will be built with a Funny Car Cage etc....
Haiyin would only sponsor one car, and I thank them for that!

K2 Energy posts on their website these modules are made with their:
LFP26650P Hi Power 3.2v 2.6ah cells.

http://www.k2battery.com/battery-packs.html

We all know K2 Energy gets their cells from:

DLG Power Battery (Shanghai China)
BUT, I have researched their website and find only:
LFP26650P Hi Power 3.2v 2.4ah cells ????????
________________________________________________________________

Questions are:

Is this the same cell?
or
Is DLG producing a special battery for K2 Energy?
_________________________________________________________________

I also cannot find the power modules on DLG's website?
_________________________________________________________________

I looked up K2 Energy address on Google Maps and found only a small office,
does K2 have a production facility in USA or is everything made in China?

 

[Hillhater]

K2 LFP 42 AH 3.2 Volt Module (LFP 165S 41.6AH Power Module)
16 - 2.6AH cells (26650P) in parallel.
2400 amps Burst Rating!

Where did you find the spec's for those modules ?
According to the individual cell spec , ..they are only rated for 50 A burst..
...so a 16p pack should be rated for 800 A burst... ??

..This is our new LFP26650P hi power rechargeable cell. It is manufactured out of our patented & thermally stable LFP chemistry. This cell can handle 42 Amps continous discharge with over 50 Amps 30 second pulses.

 

[EVDragRacer]

 

[EVDragRacer]

K2 LFP 42 AH 3.2 Volt Module (LFP 165S 41.6AH Power Module)
16 - 2.6AH cells (26650P) in parallel.
2400 amps Burst Rating!

K2 LFP 73 AH 3.2 Volt Module (LFP 300HPS 72.8AH Power Module)
28 - 2.6AH cells (26650P) in parallel.
4200 amps Burst Rating!

http://www.k2battery.com/products-26650P.html

http://batteryworkshop.msfc.nasa.gov...App_JHodge.pdf
______________________________________________________________

I am researching new battery producers because we are building a second EV Drag Funny Car!

K2 Energy posts on their website these modules are made with their:
LFP26650P Hi Power 3.2v 2.6ah cells.

http://www.k2battery.com/battery-packs.html

We all know K2 Energy gets their cells from:

DLG Power Battery (Shanghai China)
BUT, I have researched their website and find only:
LFP26650P Hi Power 3.2v 2.4ah cells ????????
________________________________________________________________

Questions are:

Is this the same cell? NO, patent cell and formula for K2 Energy
or
Is DLG producing a special battery for K2 Energy? Yes
_________________________________________________________________

I also cannot find the power modules on DLG's website? The Power Modules are built by K2 Energy here in USA!
_________________________________________________________________

I looked up K2 Energy address on Google Maps and found only a small office,
does K2 have a production facility in USA or is everything made in China? Office is connected to a warehouse and shop

I spoke with K2 Energy today so I will answer my own questions.

 

[EVDragRacer]

 

[EVDragRacer]

 

[Hillhater]

Interesting ?? ..a few differences there ..
The spec's all indicate they are using 28p of the LFP26650P hi power cells ( 2.6Ahr), but they have introduced a 3 sec "pulse" rating of 4200A ( = 150 A per cell , or 58C ) ....and a different 30sec pulse rate of 725A ( 25A per cell or 10C)
...as compared to their own individual cell 30sec "burst" rating of 50A, or 20C , . ?

I notice their test indicates a voltage drop below 3v at 560A discharge, so i wonder what the voltage drop is at 4200A ?

 

[EVDragRacer]

The gentlemen I spoke with today at K2 said the module will burst to 4200 amps for 5 seconds, then stay about 3000 amps for another 5 seconds. At that point the module keeps dropping to around 1000 amps for 30 seconds. This was a quick conversation so I may be off just a little.

150 amps per cell burst X 28 cells in parallel is 4200 amps. :lol:

 

[EVDragRacer]

Interesting ?? ..a few differences there ..
The spec's all indicate they are using 28p of the LFP26650P hi power cells ( 2.6Ahr), but they have introduced a 3 sec "pulse" rating of 4200A ( = 150 A per cell , or 58C ) ....and a different 30sec pulse rate of 725A ( 25A per cell or 10C)
...as compared to their own individual cell 30sec "burst" rating of 50A, or 20C , . ?

I notice their test indicates a voltage drop below 3v at 560A discharge, so i wonder what the voltage drop is at 4200A ?

I next line did not come through on the scanner, 1120A discharge drops to about 2.7 maybe 2.8 volts. No graph for the 5 seconds at 4200 amps, I am sure it is very low, but that does not matter to us, we will have extra voltage in this pack to compensate. We will races with torque not voltage.

 

[EVDragRacer]

Famous quote from Enzo Ferrari

"Horsepower sells cars, torque wins race"

 

[parabellum]

We will races with torque not voltage.

Are you sure you need no Voltage for?

 

[EVDragRacer]

We will races with torque not voltage.

Are you sure you need no Voltage for?

The point I was trying to make is in drag racing torque/ amps wins the prize! The controller will reduce the amps and the voltage will rise for the top end. 10 seconds and below feels like a blink of an eye, your 60' time is your most important. We will run with the new Shiva 3000amp controller and set the motor voltage to 190 volts, this seemed to work well for our 2011 season. So, lighter car 2300lbs est..more torque, same voltage.

Now, in May/ June 2012 our new motors get released. Same type 11" DC Motors (not interpoled), but with additional brushes. Netgain/ Warfield claims they will handle 400+ volts! So, the set-up may change a little, but we will always depend on high amps/ torque to win our races! :lol:

 

[parabellum]

Do those modules need redesigning to serve your purposes?

 

[Hillhater]

..This is not the Haiyin sponsored car, this car will be built with a Funny Car Cage etc....
Haiyin would only sponsor one car, and I thank them for that!

Ron, why wouldnt you still use the Haiyin cells anyway ?
compared to the K2's , the Haiyin are , lighter, higher burst current, higher voltage, ......and cheaper !!
...or are you hoping for a second battery sponsor !

 

[LiFe]

Don't take their graphs seriously. They're drawn with a pen inserted into the marketing staff's arse.

You must perform your own module testing.

I sampled some loose cells, along with one module (an earlier version of their large parallel). Epic fail.
Some of the fault was dodgy welding by an undersized inverter welder, and scaling of the conductor structure. The module had died an early death when the impedance began rising after only a few cycles, discharged at their maximum continuous current spec.

Although I'm relatively certain you'll say you already knew that Ron. :wink:

 

[EVDragRacer]

Don't take their graphs seriously. They're drawn with a pen inserted into the marketing staff's arse.

You must perform your own module testing.

I sampled some loose cells, along with one module (an earlier version of their large parallel). Epic fail.
Some of the fault was dodgy welding by an undersized inverter welder, and scaling of the conductor structure. The module had died an early death when the impedance began rising after only a few cycles, discharged at their maximum continuous current spec.

Although I'm relatively certain you'll say you already knew that Ron. :wink:

I'm listening, when did you purchase these modules? Currently I have heard excellent news on them.

 

[EVDragRacer]

Do those modules need redesigning to serve your purposes?

No, take a look at the earlier post with the NASA PDF, they seem to have thought out the module well. I was also told by an employee to make sure I ask for the "balancing board" installed when I order the modules.

 

[EVDragRacer]

..This is not the Haiyin sponsored car, this car will be built with a Funny Car Cage etc....
Haiyin would only sponsor one car, and I thank them for that!

Ron, why wouldnt you still use the Haiyin cells anyway ?
compared to the K2's , the Haiyin are , lighter, higher burst current, higher voltage, ......and cheaper !!
...or are you hoping for a second battery sponsor !

I plea the 5th.

 

[EVDragRacer]

Don't take their graphs seriously. They're drawn with a pen inserted into the marketing staff's arse.

You must perform your own module testing.

I sampled some loose cells, along with one module (an earlier version of their large parallel). Epic fail.
Some of the fault was dodgy welding by an undersized inverter welder, and scaling of the conductor structure. The module had died an early death when the impedance began rising after only a few cycles, discharged at their maximum continuous current spec.

Although I'm relatively certain you'll say you already knew that Ron. :wink:

Do you have any video or pictures of your testing?

 

[parabellum]

Do those modules need redesigning to serve your purposes?

No, take a look at the earlier post with the NASA PDF, they seem to have thought out the module well. I was also told by an employee to make sure I ask for the "balancing board" installed when I order the modules.

Make sure they are just balancing modules with no way to cut your battery out.

 

[LiFe]

Don't take their graphs seriously. They're drawn with a pen inserted into the marketing staff's arse.

You must perform your own module testing.

I sampled some loose cells, along with one module (an earlier version of their large parallel). Epic fail.
Some of the fault was dodgy welding by an undersized inverter welder, and scaling of the conductor structure. The module had died an early death when the impedance began rising after only a few cycles, discharged at their maximum continuous current spec.

Although I'm relatively certain you'll say you already knew that Ron. :wink:

Do you have any video or pictures of your testing?

As noted in the first reply, you must perform your own module testing.
Don't build on others work.

 

[frodus]

I built a few packs of these for an EV project a few years ago, and they had all sorts of issues ranging from mismatched cells, to lower than spec'd Ah capacity. We were told they'd sell us 3200 mAh, we actually got 3000mAh.

Then a year later, I built another pack using them. Welded them up myself. They had issues keeping them balanced and at higher C-rates they just don't sustain it.


Now this was a couple years ago, but as LiFe said, get a couple of them and do some serious testing on them (monitor cell voltage, temperature and output current while discharging them with a large controllable load).

 

[lutach]

Have you thought about Altairnano? I think they sponsor someone who drag races as well (Not 100% sure).

 

[EVDragRacer]

Galaxy Resources enters technology license agreement with Li-ion producer K2 Energy

http://www.greencarcongress.com/2011/07/galaxy-resources-enters-technology-license-agreement-with-li-ion-producer-k2-energy.html

 

[EVDragRacer]

Genovation EVs to use K2 Lithium Iron Phosphate Batteries (Ind. Report)
K2 Energy Solutions,Genovation
Date: 2011-03-03
Genovation Cars Inc. a Maryland designer and builder of environmentally friendly automobiles, will partner with K2 Energy Solutions, Inc. for the use of its battery packs in Genovation's line of electric automobiles. Nevada-based K2 Energy is an advanced lithium battery technology company focused on commercialization and manufacture of rechargeable battery systems for EVs and energy storage. Tata Technologies designed and prototyped Genovation's G2 EV in anticipation of incorporating the K2 battery pack into the car. Dana Corporation designed the G2's Thermal Management System to include the K2 battery pack as part of an integrated component. Genovation had been searching for a special secure and safe battery pack inherently safer than other lithium battery technologies that have been prone to thermal events.
K2's battery systems are based on a lithium iron phosphate cathode material whose inherent safety and low cost makes them ideal for the large format systems required for EV and energy storage applications. K2 provides large format battery packs and systems. (source: Genovation Cars, March 1, 2011) Contact: Andrew Saul, CEO, Genovation, www.genovationcars.com; Johnnie Stoker, CEO, K2 Energy, (702) 478-3590, www.k2battery.com

More Energy Overviews K2 Energy news, Genovation news, Lithium iron phosphate news,

http://epoverviews.com/articles/visi...able%20Battery