lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Modified Golf Carts > Extreme DC! > All things Lithium


Post New Thread  Reply
Thread Tools Display Modes
Unread 02-14-2019, 01:14 PM   #41
Gone Wild
 
Sergio's Avatar
Club Car
 
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 7,186
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

MCJEFE, by no means I am trying to convince anyone, but no one should be concerned because they think is complex, I on purpose drew that last diagram not to be 'invasive'.

All that system does is complete the "sleep" signal to negative, so if everything were to fail, all someone needs to do is flip the 'charge/sleep' switch or simply pull any of the 1/4" quick connect from the relay contacts and the circuit no longer has any affect on the system.

Also to clarify shunt, Zeva only supports a maximum of 500 Amps for a hardwired shunt so if You cart needs to read more than 500 Amps, the only solution is a CAN version (which can be a resistor or a Hall effect).

If your cart uses less than 500 Amps, the smaller shunts provides better resolution than the bigger ones.

Can't wait for my Lead Acid batteries to die
Sergio is offline   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Unread 02-14-2019, 05:17 PM   #42
I've always been crazy
 
NCPW's Avatar
Club Car
 
Join Date: Sep 2015
Location: North Carolina
Posts: 2,579
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

To follow up on what Sergio said about the shunts; I use a 200 amp shunt and it's been fine with momentary spikes of around 400amps. IIRC it can take a max of 500amps for 10 seconds, so it should suffice for our needs.
NCPW is offline   Reply With Quote
Unread 02-14-2019, 05:47 PM   #43
Gone Wild
 
MCJEFE's Avatar
Club Car
 
Join Date: Nov 2018
Location: Lady Lake, FL.
Posts: 283
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

Quote:
Originally Posted by Sergio View Post
MCJEFE, by no means I am trying to convince anyone, but no one should be concerned because they think is complex, I on purpose drew that last diagram not to be 'invasive'.

All that system does is complete the "sleep" signal to negative, so if everything were to fail, all someone needs to do is flip the 'charge/sleep' switch or simply pull any of the 1/4" quick connect from the relay contacts and the circuit no longer has any affect on the system.

Also to clarify shunt, Zeva only supports a maximum of 500 Amps for a hardwired shunt so if You cart needs to read more than 500 Amps, the only solution is a CAN version (which can be a resistor or a Hall effect).

If your cart uses less than 500 Amps, the smaller shunts provides better resolution than the bigger ones.

Can't wait for my Lead Acid batteries to die
If you ahem... happened to "forget" to water your batteries I'm pretty sure they will wither and die an early death like my wife's herb garden... just a thought (might want to source the new batteries first!).

Sent from my SM-G960U using Tapatalk
MCJEFE is offline   Reply With Quote
Unread 03-05-2019, 03:57 AM   #44
JsK
Not Yet Wild
 
Join Date: Feb 2019
Posts: 17
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

It looks like you compressed your modules almost an inch from there free stack height. Is there a spec you used? Or just compress them until the feruls in pack holes bottom out.
JsK is offline   Reply With Quote
Unread 03-05-2019, 06:02 AM   #45
Gone Wild
 
Sergio's Avatar
Club Car
 
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 7,186
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

The pouch cells inside a Leaf module need to be under compression the entire time as the chemical elements inside the pouches have a natural tendency to expand with discharge/charge.

The recessed tray design on the end of the case acts as a spring washer to compress the middle of the module when you torque the corners.

I have never seen the torque specs for those threaded rods, but the distance between the center of adjacent module terminals when the pack is torqued should be 1.3333".
Sergio is offline   Reply With Quote
Unread 03-05-2019, 02:28 PM   #46
Gone Wild
 
MCJEFE's Avatar
Club Car
 
Join Date: Nov 2018
Location: Lady Lake, FL.
Posts: 283
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

Quote:
Originally Posted by JsK View Post
It looks like you compressed your modules almost an inch from there free stack height. Is there a spec you used? Or just compress them until the feruls in pack holes bottom out.
There are inserts in the corners that you run the allthread through. These inserts act as a spacer for each module and help keep it from over compressing. On the two packs I've put together it's easy to tell when you have the slack out. I just tightened until good and snug and 1/2 turn for good measure. On my packs all 4 corners measured 19" including 2 end plates (see post #10).

Sent from my SM-G960U using Tapatalk
MCJEFE is offline   Reply With Quote
Unread 03-06-2019, 01:27 AM   #47
JsK
Not Yet Wild
 
Join Date: Feb 2019
Posts: 17
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

Quote:
Originally Posted by MCJEFE View Post
There are inserts in the corners that you run the allthread through. These inserts act as a spacer for each module and help keep it from over compressing. On the two packs I've put together it's easy to tell when you have the slack out. I just tightened until good and snug and 1/2 turn for good measure. On my packs all 4 corners measured 19" including 2 end plates (see post #10).

Sent from my SM-G960U using Tapatalk
Are you using the spacers from the factory pack between the cells?
JsK is offline   Reply With Quote
Unread 03-06-2019, 05:45 AM   #48
Gone Wild
 
Sergio's Avatar
Club Car
 
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 7,186
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

See this post if these are the spacers you are referring to, the thickness of the spacer is required for proper module compression:
Bit the bullet Leaf Lithium build
Sergio is offline   Reply With Quote
Unread 03-06-2019, 09:19 AM   #49
Gone Wild
 
MCJEFE's Avatar
Club Car
 
Join Date: Nov 2018
Location: Lady Lake, FL.
Posts: 283
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

Quote:
Originally Posted by Sergio View Post
See this post if these are the spacers you are referring to, the thickness of the spacer is required for proper module compression:


Bit the bullet Leaf Lithium build
Sergio, sorry I wasn't clear. I wasn't talking about the large flat Gen1 spacers, I was referring to the Gen2 round thin metal inserts that are installed from each side of each module mounting hole. They're shaped like a thimble if you cut off the top.

Sent from my SM-G960U using Tapatalk
MCJEFE is offline   Reply With Quote
Unread 03-06-2019, 09:47 AM   #50
Gone Wild
 
Sergio's Avatar
Club Car
 
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 7,186
Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

I figured you were referring to the assembly of press-fit washers in each end of the cylindrical sleeve that runs inside the module.

As you mentioned when that assembly is fully bottomed out, the outside plates are at the proper tension for the cell pouches. The module should compress to 1.355".

JsK comment about "between the cells" made me think of the brackets that are needed if the module is recessed like in the post I referenced.


Edit: I am sorry, but I read the number wrong, my notes show the spacing between adjacent modules at: 1.355"
Sergio is offline   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Modified Golf Carts > Extreme DC! > All things Lithium


Thread Tools
Display Modes


Similar Threads
Thread Forum
05 CC Precedent 14 cell Leaf Lithium conversion. Lithium Club Car
A look inside Nissan Leaf lithium battery pack All things Lithium
Lithium Nissan Leaf conversion x 2 Lithium Club Car
Yamaha Drive with Lithium Nissan leaf batteries Lithium Yamaha
Nissan Leaf Balancing Electric EZGO


All times are GMT -5. The time now is 03:26 AM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.