lorenfb
Posts: 2598
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: 62kwh Leaf Plus Efficiency Posting

SageBrush wrote: Mon Jun 20, 2022 11:03 am
DougWantsALeaf wrote: Mon Jun 20, 2022 10:11 am It seems you could build a single piece top battery cover with a molded heat exchanging set of small tubes and then put a small fan in the pack to push the air across those tubes. Even a modest amount of additional cooling would make long distances less frustrating.
The only practical way I can think of to mitigate rapid-gating from serial DC fast charging is to drive slowly. 55 mph Vs 70 mph would be close to 40% less pack heat generation. And somewhat paradoxically but for similar reasons, you may want to to avoid charging in the low SoC range so that the car keeps to lower charging amperage.

From from great, but I think travel times better than what you and others have posted are possible. When it comes to the LEAF, patience is a virtue :lol:
Yes, this has been stated many times, but they never seem to understand even a little of thermodynamics.
There's always a new way to cool or minimize increasing battery heat that hasn't been thought of, right?
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 28K miles, SOH 105Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F
DougWantsALeaf
Posts: 3261
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: 62kwh Leaf Plus Efficiency Posting

Even at 55mph or the drafted equivalent, it's not quite enough for 4x DC charging on very hot days. Even a little air based heat dispersion would go a long way.
2019 S Plus (93.1% SOH) & 2019 SV Plus (90.7% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh
OldManCan
Gold Member
Posts: 252
Joined: Fri Nov 19, 2021 10:48 am
Delivery Date: 07 Dec 2021
Leaf Number: 553784

Re: 62kwh Leaf Plus Efficiency Posting

This makes me wonder. What if someone manufactured a replacement lower half for the battery clam-shell using heat dispersing material and heat sink like fins etc. Wonder if it would help much.
2022 SL+
SoCal
DougWantsALeaf
Posts: 3261
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: 62kwh Leaf Plus Efficiency Posting

It might, but I find the heat at the top of the pack under the rear seats is the hard part, the lower front pack cools much faster, I am guessing due the greater surface area.
2019 S Plus (93.1% SOH) & 2019 SV Plus (90.7% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh
lorenfb
Posts: 2598
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: 62kwh Leaf Plus Efficiency Posting

OldManCan wrote: Tue Jun 21, 2022 6:44 am This makes me wonder. What if someone manufactured a replacement lower half for the battery clam-shell using heat dispersing material and heat sink like fins etc. Wonder if it would help much.
You are aware that "heat sink fins" increase the surface area of what's attached to the fins, right?
And as such, the fins can also cause the device they're attached to increase in temperature sooner,
assuming the device is initially at a lower temperature than ambient, e.g. an initially low temp
parked Leaf being driven in a hot ambient.

Anyway, the use of fins for a Leaf battery is laughable, given the thermal mass of the Leaf battery,
notwithstanding the size of the fins necessary, but also the practical placement of the fins.
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 28K miles, SOH 105Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F
DougWantsALeaf
Posts: 3261
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: 62kwh Leaf Plus Efficiency Posting

WEIXIZ cable EV Charger Converter Electrical Car Connector CHAdeMO To GB/T Conversion Plug https://amzn.eu/d/cie3bpe

One step closer to a ccs chademo adapter
2019 S Plus (93.1% SOH) & 2019 SV Plus (90.7% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh
OldManCan
Gold Member
Posts: 252
Joined: Fri Nov 19, 2021 10:48 am
Delivery Date: 07 Dec 2021
Leaf Number: 553784

Re: 62kwh Leaf Plus Efficiency Posting

lorenfb wrote: Tue Jun 21, 2022 4:33 pm Anyway, the use of fins for a Leaf battery is laughable, given the thermal mass of the Leaf battery,
notwithstanding the size of the fins necessary, but also the practical placement of the fins.
Copy that. Mine was an uneducated wondering. Case closed.
2022 SL+
SoCal
DaveinOlyWA
Posts: 16046
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: 62kwh Leaf Plus Efficiency Posting

Have to do some digging but did the slow drive with VERY mixed results.

The key to heat is limiting DC charging levels. Tried "nearly" same trip under "similar" circumstances 3 times but vastly different driving

Trip 1; Mixed driving speeds due mostly to traffic which was severe in places. Left home, low SOC, charged to 65% more or less 4 times en route with one charge stop due to extreme personal need so gained only 6 or 7 kwh there. Batt temps hit low 100's, OAT near 90 (probably a bit over during the middle of the day on asphalt)

Trip 2; Same destination but took different slower route with less charging options. Left home with full charge, stopped twice charging to 80ish% one time, 75% the 2nd, Batt temps mid to high 110's OAT 85 Both charges started below 15% SOC (spent night)

Trip 3; Different destination about 40 miles longer overall. Full charge leaving home, 2 enroute one for personal break to 50ish% the other to 70%. Then spent day hiking, left, hit dinner and charge to high 60's % then sprint home hitting 70 mph, OAT over 100º. Batt temps low 100's.

Although not notated (still have LEAF Spy logs) it appears the best way to reduce heat is stop DC charges at no more than 60-70%. More than a bit inconvenient. When I exceeded that, the slowdown on 100 Kw stations were extreme with charging knee as low as 30 %. 50 KW stations weren't too bad with ~ 5 kw slowdown or less.
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; 25,047 mi, 92.12% SOH
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;
DaveinOlyWA
Posts: 16046
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: 62kwh Leaf Plus Efficiency Posting

OldManCan wrote: Tue Jun 21, 2022 6:44 am This makes me wonder. What if someone manufactured a replacement lower half for the battery clam-shell using heat dispersing material and heat sink like fins etc. Wonder if it would help much.
I think the most effective way is venting at the top fan driven but the incoming air would need to be vented in creating a challenge for moisture. The Soul EV vented from the passenger space like the Prius so yeah, that would be one idea anyway. I know a Souler who was an EXTENSIVE road tripper who wore a coat all summer long due to the fact he drove 70 plus all the time with A/C cranking.
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; 25,047 mi, 92.12% SOH
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;
DougWantsALeaf
Posts: 3261
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: 62kwh Leaf Plus Efficiency Posting

For most driving needs forced air cooling would be enough. Who's brave enough to drill the holes in their Leaf Battery case? That's essentially how the eNV200 battery cooling works.
2019 S Plus (93.1% SOH) & 2019 SV Plus (90.7% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
100 Mile Club Member (Number 87)
Max Miles on 13 Leaf: 120 miles
Max Miles on 19 SV+: 242 Highway miles @ 4.5 miles/kWh

Return to “Range / Efficiency / Carwings”