Page 1 of 1

18650 battery range extander and main battery remake ( DIY please help )

Posted: Mon Jul 15, 2019 12:10 am
by KEVDIY
hi I am from asia,
LEAF car year is 2012 last


i make project (DIY) range extender for my leaf car, using 18650 li-ion batteries. but i faced some problem with LEAF car. is that problem is leaf there car remaining Range (km/Miles) over (3 side strips on range remaining dash) time voltage is (from leaf spy) "365V" one li-ion cell voltage is 3.8V ( 365/96 = 3.8) .

the after we can drive for charging, but i drive car end of turtle "mode" ( car is totally battery lost) that time i check with my leaf spy app the car voltage, after car stop voltage is "355V" one li-ion cell voltage is 3.7V ... now have a problem, 18650 cell nominal voltage is 3.7V .. the low voltage is 3.1V or 3.2V. have a power of cell 4.2 v to 3.2V i can use that battery cell to 3.2V low volt but LEAF HV battery cutoff the main battery one cell voltage is 3.7V .. that my question is how configuration nissan LEAF main battery low voltage cutoff move down from program. If the program how to change with any diagnosis tool or any program tool ?? pleas help guys its most important to me for DIY project :)



thanks!!!

Re: 18650 battery range extander and main battery remake ( DIY please help )

Posted: Mon Jul 15, 2019 12:18 am
by LeftieBiker
Others with real expertise at this will follow, but it is my understanding that you cannot change the programming of the Leaf LBC/BMS. You are facing other serious issues, but if you cannot match voltage profiles, you will not be able to connect the range extender as you intended. I think it is possible to work around this limitation, but again I suggest you wait for the experts to post here.

Re: 18650 battery range extander and main battery remake ( DIY please help )

Posted: Mon Jul 15, 2019 1:20 pm
by alozzy
I'm no expert either, but these articles discuss some details about the AESC cells in the LEAF packs and some of your assumptions seem to be incorrect:

https://qnovo.com/inside-the-battery-of-a-nissan-leaf/

https://www.nissan-global.com/EN/TECHNO ... on_ev.html
... It uses a different material for the cathode called lithium-manganese-oxide with nickel oxide (LiMn2O4 with LiNiO2) that is inherently safer than the lithium-cobalt-oxide cathode material used in mobile devices and the Tesla pack. The cell’s voltage chart shows a maximum cell voltage of 4.2V. Rated nominally at 3.75V ...
On 2011/2012 LEAFs, it looks like the nominal cell voltage is 3.75V whereas on 2013+ 24kWh packs, it's 3.65V

You might also want to check out this YouTube channel:

https://www.youtube.com/user/PowerElect ... log/videos