DougWantsALeaf
Posts: 1200
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: Battery Upgrades are very possible

Tue Jan 14, 2020 4:28 pm

Ideally the fan would be with thermometer and actuator to either route air to or from cabin or outside depending on what you need. Cold battery and warm cabin, take cabin air. Battery at 120F, pull in outside air. Battery at 70F and outside at 0F, no fan....etc.

Actually I have wondered if a small airscoop on the bottom of the car to pull air over the battery (with actuator to close in winter) would effectively solve the small remaining hot battery long long trip issue.
2019 SV Plus Silver
2013 Leaf SV
100 Mile Club Member (Number 87)
Max distance on 13 Leaf: 120 miles
Max distance on 19 Leaf: 242 Highway 4.5 miles/kWh (4.9 KWh remaining)

Oilpan4
Gold Member
Posts: 1039
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: Battery Upgrades are very possible

Wed Jan 15, 2020 1:05 am

I think we can safely say cooling the battery from the outside isn't going to cut it.
Add a fan on the inside and force that air between the modules and along the case may yield a slight improvement by speeding up heat transfer since dumping ice down the fuse access hole in the floor on top of fuse access cover area of the battery seems to help.
2011 white SL leaf with 2014 batt.
Chargers: Panasonic brick moded for 240v, duosida 16a 240v and a 10kw setec portable CHAdeMO
Location: 88103

DaveinOlyWA
Posts: 14384
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: Battery Upgrades are very possible

Wed Jan 15, 2020 7:34 am

DougWantsALeaf wrote:
Tue Jan 14, 2020 4:28 pm
Ideally the fan would be with thermometer and actuator to either route air to or from cabin or outside depending on what you need. Cold battery and warm cabin, take cabin air. Battery at 120F, pull in outside air. Battery at 70F and outside at 0F, no fan....etc.

Actually I have wondered if a small airscoop on the bottom of the car to pull air over the battery (with actuator to close in winter) would effectively solve the small remaining hot battery long long trip issue.
Yeah that would be the ultimate. Simply a system that has two outlets. One to the atmosphere, the other back into the car. Adjustable Thermostat control. Turn on when batt temps hit 90º... It would be an interesting contest in Summer between A/C and battery (A/C will have ambient solar to fight as well) Not sure Summer will improve a ton.

Winter would be a different story. Keeping pack cool and warming passengers would be great. We have had cold weather and even with defrost on 61º (one degree up from lowest) and fan speed of one, its still rather warm. Since set point is so low compared to cabin temp, the low fan seems to have an effect of just warming the front of car only.

Power output is still high for a time so not sure if its more efficient or not?
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 2640.9 mi, 99.37% SOH
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

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