Panasonic 1.5 kWh Li-ion Battery Module Home Storage & EV's

[MitchJi]

Hi,

These should be readily available and produced at a scale that might make the price reasonable. How hard would it be to hack it for 50V 29 Ah?

http://www.greencarcongress.com/2009/10/panasonic-20091001.html#more

Panasonic Develops 1.5 kWh Li-ion Battery Module; Targeting Home Storage and Vehicle Applications

1 October 2009

Panasonic Corporation has developed a 1.5 kWh battery module from 18650-type (18 mm in diameter x 65 mm in length) lithium-ion battery cells to provide energy storage solutions for a wide range applications. Multiple units can be connected in series and/or parallel to store energy generated by home-use photovoltaic (PV) systems and fuel cells or power electric vehicles (EV), the company suggests.

The module has a volume of approximately 7 liters and weighs 8 kg. Voltage is 25.2V with a capacity of 58 Ah. A prototype will be shown at CEATEC JAPAN 2009 (Makuhari Messe, 6-10 October 2009) and New Energy Industry Fair Osaka (Intex Osaka, 7-9 October 2009).

The high-energy module is constructed from 140 18650-type lithium-ion battery cells—seven serially connected rows with each row made of 20 parallel connected battery cells. This structure allows for avoiding serious loss in the system performance such as system shutdown even if some individual cells fail, Panasonic says.

To build the module, Panasonic employed a high-capacity and high-durability cell technology using its proprietary nickel-based cathode material (LiNiO2). Other technologies used include its cell safety technology that uses a heat-resistant metal oxide insulating layer between the positive and negative electrodes to prevent short circuits and thermal runaway which can be caused when foreign particles get mixed into the battery cell. The new module also uses Panasonic's design technology to ensure reliability by minimizing the effects on power supply if a trouble occurs in some of the cells contained in the module.

 

[voicecoils]

No end in sight for the 18650 format eh?

1500Wh/8kg = 187.5 Wh/kg

For comparison, the Tesla Roadster using the same format cells is:

54,000Wh / 450kg = 120 Wh/kg

The difference I suspect is in the battery pack packaging, integrated BMS, cooling and other protection features. The Tesla ESS pack may be able to deliver far higher current (and therefore peak power). /speculation

 

[liveforphysics]

LiNiO2 is a pretty high energy density chemistry if what they are saying is correct. 2.9Ah from an 18650 chemistry is the best I've ever seen outside of LiCo. If the modules are cheap, it could be fun to use 2-4 of them in series to run a bike, but as a general rule of thumb, cells tuned for high energy generally have high Ri and sag quite a bit even at 1C loads.

Looks like a good step in the right direction

 

[Doctorbass]

This is all info you have been waiting for about the cells


I found the Panasonic NRC18650 2900mAh NNP serie cell that i'm pretty sure are in this 58Ah pack!

This is a guy JTSgalaxy on the the candleofpower forum that posted this:
http://sale.jtsgalaxy.com/ncr18650/

Very interesting graph!

Personal test he did after 5 Charge/discharge break-in cycles:
1A disch: 2989mAh
2A disch: 2889mAh
3A disch: 2860mAh

Manufactur specs;
http://industrial.panasonic.com/www-cgi/jvcr13pz.cgi?E+BA+3+ACA4001+NCR18650+7+WW

Specifications:
Genuine Panasonic Cell Made in Japan
Capacity: 2900mAH (2750 Minimum)
Max charge current: 0.7C 2A
Recommended discharge current: 1C 2.9A
Discharge Termination Voltage: 2.5V
Internal resistance: <= 60m ohm
Approx.Weight: 45 (g)

According to the manufactur specs, the internal resistance is max 60 miliohm

So in 20p configuration that's 3 miliohm per parallel group

And the panasonic pack is 7s20p ( 140s) so 7 x 3milliohm = 21 miliohm for 25.2V pack

At 1C ( 58A) the voltage drop should be 0.021 x 58 = 1.21V.... hmmm that remember me something that number!.... 1.21 GIGOWATTT!!! ...

So with a 25.2V pack the voltage drop at 58A is just down to 24V.... it's 96V on a 100V pack at 58A... not bad!... and still have 57Ah capacity!

The cons is that they say that the voltage is 3.6V and not 3.7V like usuall lithium cells


The JSTGalaxy guy sis selling them for 12$ each... 2.9Ah at 3.6V = 10.44Wh per cells!!!!!

it's like 1.10$ per Wh (for a cell of 232Wh per kg and 495Wh per liter)



Doc

 

[pwbset]

3.1ah for their new 18650 cell... hmm... even if it is just a "laptop" batt and could only handle 1C sustained that's still pretty doable for an ebike in like a 10s6p configuration kicking out 500-600W. Imagine only using 60 18650 cells to get ~650wh. Wonder where we can get our hands on these for testing?

http://panasonic.co.jp/corp/news/official.data/data.dir/en091218-2/en091218-2.html

 

[Doctorbass]

Great new.. I never known that the 2.9Ah was released as far as 2006 !!

with 11.2Wh per cell that mean that replacing every of my actual Konion i would have a total of 5kWh on my actual ebike!!

Just enough to go from Wuebec and to reach Steveo's home!

I also wonder WHERE we can buy them.. probably that someone alreasdy found that on the candleofpower forum..

Doc

 

[Doctorbass]

Matsushita released a 3600mAH 18650 cell last year!!!
But stopped production

http://www.dailytech.com/article.aspx?newsid=5681

Doc