NuVinci hubs and A123 batteries

[Chief eZee Power]

Hi,

Advertising for some and information to others.

We have available now the latest NuVinci N360 hubs with disc brakes attachments so it goes to the eZee Torq and Forza models. This comes with the latest hydraulic disc brakes with electric cut off function on the levers Tektro Auriga E-sub. Those who wish to know more about the NuVinci check www.nuvinci.com

I noted a lot of interest in conversion kits and batteries in the forum. We will have soon A123 M1 22650 batteries pack with 60 amps BMS. The cells are rated 3.2V 2300 mAh and 3S12P giving 38.4V6.9Ah. The advantage being of course the very well known long life spans and 30C rating. 4amps chargers for LiFePO4 available as well. Specially designed rear carrier/racks for battery available in MTB or City type, with lock and ignition switch.

An individual could built his own pack without BMS. But for such an expensive pack of battery as a reliable supplier we cannot take such a risk, everything must go according to plan. For the time being, I think it make sense for me to sell and ship direct, because they are expensive, but I am still making best deal there is in the world for A123 batteries e-bike pack. Those interested please email me directly ezeebike@gmail.com

Chief eZee Operator

 

[eddieo]

I dont consider this advertising. Information regards new technology and availability is exactly what we need, I object to mixed messages that is all

would the 123 battery pack be available with your kit?

what size and weight will it be?

have you considered a pack that can be fitted in frame? along the lines of what BionX do?

 

[tangent]

The cells are rated 3.2V 2300 mAh and 3S12P giving 38.4V6.9Ah.

Something not quite right with this. 3S12P 3.2V would be 9.6V, 27.6Ah. I assume this should read 12S3P.

How is the wiring of this configured? e.g. do you connect 3 separate sets of 12 cells in series and put diodes in to prevent self discharge? Or can you get away with putting 3 A123 cells in parallel and then putting 12 of these in series?

 

[jerrysimon]

Nice to see a supplier finally adopting A123 cells. Well done!

By the way I think you mean 12S3P as 3S12P would give you 9.6V 27.6Ah

I will continue to build my own 38.4V 2.3Ah (2 * 6S1P packs connected in series) "without" a BMS. These cost me about £70 to make and I am just about to make a second one.

I have been using these nearly every day for well over 6 months with no problems. Cells remain with 20mv of each other, in terms of balancing


Regards

Jerry

 

[jerrysimon]

tangent I don't think diodes are required, though I am not certain. I am sure you could check the Endless-spere forums to confirm. I plan to carry two or possibly three of these packs seperated when I know that I am going on a longer journey, and then just swap them out as required. Each packs give me about 10 miles on my Brompton with a Tongxin motor on it, but then I live in pretty flat Cambridge.

The reason I built them into 6S packs is so I can split them down and charge/balance them with a cheap RC based charger/balancer. Having said that apart from intially balancing them when I built them, I have not had to do that.

I charge them daily in their 12S1P configuration using a cheap charger I purchased off ebay.

Regards

Jerry

 

[tangent]

Hi Jerry,

I am thinking of building a 9S1P pack as a backup for my Technium Privilege (aka Kalkhoff Agattu), but am unsure how to charge it. I will get a balance charger as you do, but for convenience would like to charge it as a 9S1P as well. I have a bench power supply with which I can configure precise voltage and a maximum current. Could I use this, or do I need something that will detect when the pack is charged and then stop charging?

I use my bench supply to charge NiMH packs at a constant 0.1C without a problem but am not sure if I would damage A123 cells by doing something like that.

 

[jerrysimon]

Tangent,

I am not sure if you could use a Bench Supply though again I think I have read on endless phere of people using them. I am not expert and tended to copy others when I built my packs and selected a charger. This is the one I purchased off ebay

Cost £8 off ebay but took two weeks to deliver. If you read the label it has some floating charge gizmo that kicks in at the end of the charge I think to finish it off. On the front two lights red charging green charged. This charger is obviously for 12 cells (36v) unlike your 9 cells (24v). I think 24v chargers of simlar type are also available and would probably meet your requirement.

BTW here is the link to my battery build thread if you haven't seen it already. The balance/charger shown in that is for up to 6s (hence why I split the 12s pack into two) not sure if you can get them up to 9s.


Regards

Jerry

 

[tangent]

Thanks Jerry, I was thinking of connecting up 3 3s packs for ease of balancing.

Unfortuneately I don't think a 24V charger would work for me as these seem to be designed for 8s packs.

 

[jerrysimon]

Of course 8 not 9

That's an unusal voltage pack size then ?

PS just checked the bikes and see they use 26v systems.

Regards

Jerry

 

[Mussels]

I can't fault that, it sounds like a very good setup.

 

[Chief eZee Power]

A123 38.4V 6.9Ah

Sorry for the typing error, Thank you all for the correction , it is 3P12S for sure.

We don't have the battery for attachment to the frame as what Bionx does, we have the MTB and City type carriers. We finished designing one recently but yet to start on the toolings of it, we have so many other things going on.

On our KITS, we have options for many different batteries types :-

With our standard casing - suitable only for the pannier type bags
37V10 Ah and 14 Ah - LiPo

With our flat casing with the rear carrier - MTB or City type
37V 10Ah LiPo

37V 14Ah Samsung cells ( 18650 type )

38.4V 9Ah LiFePO4 ( 22650 type and Phostech cathode material, 3P12S )

38.4V 6.9Ah LiFePO4 ( 22650 type and A123 cells 3P12S )

Then we have kits with 48V system and batteries for 48V 10Ah, and motors with 250 rpm, 300 rpm and 350 rpm ( at 36V )

I take the opportunity here to share a piece of news and indulge myself into copying this email from this morning from Ben the founder of Yuba cargo bikes :

Hi Waiwon,
I was wondering if you were going to Eurobike next week? I will be there and maybe it would be good to arrange a meeting.
Otherwise I will most likely go back to China in October, so this could be a good time to work some of the details. BTW I'm still planning on sending you some bikes for electric assembly once this production is ready to go.
I got a kit from Justin and have been riding an eZee/Yuba for 3 weeks now and your stuff is really, really good. We will definitely offering your motors/ batteries in 2011.
I hope you are well.
Ben
- Show quoted text -
----------------------
Benjamin Sarrazin | Yuba Bicycles LLC
ben@yubaride.com | Cargo Bikes, Cargo Bicycle, Cargo Bicycles, Utility Bikes, Utility Bicycle, Utility Bike, Carry Stuff by Bike
office: 415.331.1126 | cell: 415.823.8074 | fax: 415.524.4178 | skype : bensarrazin

Chief eZee Operator

 

[jerrysimon]

38.4V 9Ah LiFePO4 ( 22650 type and Phostech cathode material, 3P12S )
Chief eZee Operator

Again just to be pedantic I think you mean

38.4V 9.2Ah LiFePO4 ( 22650 type and Phostech cathode material, 12S4P)

Regards

Jerry

 

[Chief eZee Power]

Phostech cells

Again just to be pedantic I think you mean

38.4V 9.2Ah LiFePO4 ( 22650 type and Phostech cathode material, 12S4P)

Regards

Jerry

The Phostech cells are 3.2V 3000 mAh but is rated for 2C and different from A123 3.2V 2300 mAh rated for 30C. Same number and arrangement of 36 cells in the casing. The BMS for the Phostech cells are for max. 20 amps whereas the A123 is for 60 amps.

Regards
W W Ching

 

[jerrysimon]

Yes W W Ching I realised after posting that they were not A123 cells

Anyway as I said glad to see you adopting these very robust and flexible A123 cells

Regards

Jerry