Welcome
Username or Email:

Password:


Missing Code




[ ]
[ ]
Online
  • Guests: 16
  • Members: 0
  • Newest Member: omjtest
  • Most ever online: 396
    Guests: 396, Members: 0 on 12 Jan : 12:51
Members Birthdays:
One birthday today, congrats!
uzzors2k (35)


Next birthdays
03/29 GrantX (34)
03/30 Adam Horden (39)
03/30 Mr.Warwickshire (23)
Contact
If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.


Special Thanks To:
  • Aaron Holmes
  • Aaron Wheeler
  • Adam Horden
  • Alan Scrimgeour
  • Andre
  • Andrew Haynes
  • Anonymous000
  • asabase
  • Austin Weil
  • barney
  • Barry
  • Bert Hickman
  • Bill Kukowski
  • Blitzorn
  • Brandon Paradelas
  • Bruce Bowling
  • BubeeMike
  • Byong Park
  • Cesiumsponge
  • Chris F.
  • Chris Hooper
  • Corey Worthington
  • Derek Woodroffe
  • Dalus
  • Dan Strother
  • Daniel Davis
  • Daniel Uhrenholt
  • datasheetarchive
  • Dave Billington
  • Dave Marshall
  • David F.
  • Dennis Rogers
  • drelectrix
  • Dr. John Gudenas
  • Dr. Spark
  • E.TexasTesla
  • eastvoltresearch
  • Eirik Taylor
  • Erik Dyakov
  • Erlend^SE
  • Finn Hammer
  • Firebug24k
  • GalliumMan
  • Gary Peterson
  • George Slade
  • GhostNull
  • Gordon Mcknight
  • Graham Armitage
  • Grant
  • GreySoul
  • Henry H
  • IamSmooth
  • In memory of Leo Powning
  • Jacob Cash
  • James Howells
  • James Pawson
  • Jeff Greenfield
  • Jeff Thomas
  • Jesse Frost
  • Jim Mitchell
  • jlr134
  • Joe Mastroianni
  • John Forcina
  • John Oberg
  • John Willcutt
  • Jon Newcomb
  • klugesmith
  • Leslie Wright
  • Lutz Hoffman
  • Mads Barnkob
  • Martin King
  • Mats Karlsson
  • Matt Gibson
  • Matthew Guidry
  • mbd
  • Michael D'Angelo
  • Mikkel
  • mileswaldron
  • mister_rf
  • Neil Foster
  • Nick de Smith
  • Nick Soroka
  • nicklenorp
  • Nik
  • Norman Stanley
  • Patrick Coleman
  • Paul Brodie
  • Paul Jordan
  • Paul Montgomery
  • Ped
  • Peter Krogen
  • Peter Terren
  • PhilGood
  • Richard Feldman
  • Robert Bush
  • Royce Bailey
  • Scott Fusare
  • Scott Newman
  • smiffy
  • Stella
  • Steven Busic
  • Steve Conner
  • Steve Jones
  • Steve Ward
  • Sulaiman
  • Thomas Coyle
  • Thomas A. Wallace
  • Thomas W
  • Timo
  • Torch
  • Ulf Jonsson
  • vasil
  • Vaxian
  • vladi mazzilli
  • wastehl
  • Weston
  • William Kim
  • William N.
  • William Stehl
  • Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Forums
4hv.org :: Forums :: General Science and Electronics
« Previous topic | Next topic »   

2012 Nissan Leaf Battery Module 7.6V.

Move Thread LAN_403
Patrick
Sun Jun 04 2017, 02:11AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I saw a long list of EV battery modules on Ebay in the midst of my EV car research, and thought whoa ! i could evaluate its internals and use it for my drones and other robotic projects.I think with a 3C output that means 100 Amps which does seem plausible when attempting to lift a drone. I just dont know how to cool it off.


1496543812 2431 FT1630 Module Battery
The module in OEM form. Used 75 US$.

Some OEM module specs :

Case: Formed thin aluminum sheet metal.
Type: Pouch, 4 cells.
32.5 Ah and 3.75 V per cell.
Circuit: 2 series 2 parallel
7.6 volts nominal, 60 to 90 amp normal output.

Mass 3.787 kg (8.4 pounds)
Dimensions : 22.2cm W x 30.7cm L x 3.7cm H

Chemistry:
Cathode = LiMn2O4 with LiNiO2
Anode = Graphite



1496542529 2431 FT1630 Mega Battery
Striped down to the bare pouches.

Specs after liberation :

Mass 3.293 kg (7.3 pounds)
Dimensions (Cell Stack): 21.6cm W x 29.2cm L x 3.3cm H
Mass removed = 493 g (1.1 pounds)
14.6 % lighter.
Connecting bars : 0.252 cm^2 several centimeters long. Seemed to be harder to cut than natural copper. (Appx 3 or 4 awg.)


More pics:


1496544779 2431 FT1630 Removed Stuff Battery
Removed elements. The blue plastic layers are on top and bottom, hard to get them off but i did, they appear to be anti-abrasion material very slippery. These plastic film pouches are known to be delicate and prone to puncture, we drone pilots find this often.


1496545141 2431 FT1630 Terminals
Negative, Balance and Positive terminals.


1496550026 2431 FT1630 End Battery
2 series 2 parallel as manufactured.


1496550026 2431 FT1630 Tab Battery
Tabs all cut free. Soon to be arranged as 4 in series, 14.8 Volts. Ill be using copper strips from the hobby store of the same area as the original bus bar. The standard balance wires and connector will be added.


1496553652 2431 FT1630 Junk
Junk removed from the battery. Some of this mass will be added back on in kapton insulating film and copper connection bar.



Im trying to calculate the differences compared to this Link2

59.99 US$ for 5Ah versus 120 US$ for 32Ah , a 6.4 times difference is interesting.




Back to top
Carbon_Rod
Sun Jun 04 2017, 09:14AM
Carbon_Rod Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
Most high drain rate batteries do not use parallel packs for several reasons.

1. The internal impedance will change with use, and will rarely be matched even if regularly balanced. Under heavy loads this can dissipate a significant amount of wasted capacity as additional heat (on rare occasion spontaneous fires).
2. Most air craft minimize cell count to match flight mode rpm with KV and prop pitch. Thus, a 3 cell or 4 cell setup is most common for VTOL to maximize flight time, as even a small LiPol can provide 20C to 50C.
3. The lower rpm of larger motors are not necessarily more efficient.

We found smaller dual isolated battery systems are better for performance due to the peak power output numbers (more surface area with negligible differences in power density), but flight times are still limited by the weakest cell in the packs.

ebay batteries are often production rejects or from users that dump packs showing the mentioned changes.
YMMV wink
Back to top
Patrick
Sun Jun 04 2017, 11:38PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Didn't want to buy new, and had to start somewhere.
Back to top
Patrick
Mon Jun 05 2017, 12:14AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Carbon_Rod wrote ...

3. The lower rpm of larger motors are not necessarily more efficient.

Im constantly struggling with this one, the U series of T-motors are 180$ and very low rpm - - 120 kv
Back to top

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Go to:

Powered by e107 Forum System
 
Legal Information
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.