cwerdna
Posts: 9733
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 12:50 am

metricus wrote:The Leaf already has a TMS for the stator and the onboard charger. Beats me why they did not add the battery pack to the circuit. But that's another topic.
They probably have different ideal operating temps.

And, AFAIK, the liquid cooling system for the Leaf motor and OBC isn't connected at all with the AC system and its refrigerant. So, it won't be able to get those bits cooler than outside air temp, which is probably ok.

FWIW, as I posted in the Bolt thread (with video), they have 3 separate "coolant" loops: the loop for the OBC, motor, DC to DC converter and maybe one more thing also isn't cooled by the AC compressor and is just sent to a radiator. The coolant loop for the battery does have its heat removed by the AC compressor system and apparently also has a 2 kW coolant heater. The 3rd loop is for the crap "water" heater and that's not connected to anything else.

And, there can be considerable extra complexity to cool each of the modules properly.

Maybe I'll get to watching the entire 1.5 hour video for the Bolt battery at https://www.youtube.com/watch?v=ssU2mjiNi_Q someday.

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

SageBrush
Posts: 4907
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: NM

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 6:20 am

cwerdna wrote: And, there can be considerable extra complexity to cool each of the modules properly.
People would appreciate even a half-baked attempt for the LEAF
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Two years in Colorado, now in NM
03/2018: 58 Ahr, 28k miles
11/2018: 56.16 Ahr, 30k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

DaveinOlyWA
Posts: 14149
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Feb 2018
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 6:31 am

cwerdna wrote:
metricus wrote:The Leaf already has a TMS for the stator and the onboard charger. Beats me why they did not add the battery pack to the circuit. But that's another topic.
They probably have different ideal operating temps.
Way different and not very effective. The charger gets quite warm even with L2 charging (it does not heat up during DCFC sessions) so well above "pack prime" temps.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

metricus
Posts: 94
Joined: Wed May 15, 2019 1:51 pm
Delivery Date: 28 Apr 2019
Leaf Number: 307046
Location: Reading, PA

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 6:44 am

DaveinOlyWA wrote:
Way different and not very effective. The charger gets quite warm even with L2 charging (it does not heat up during DCFC sessions) so well above "pack prime" temps.
In other words we need a heat pump not just a radiator. Makes sense because at some ambient temps (hi 30C) we already have throttling.

lorenfb
Posts: 2257
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 8:14 am

cwerdna wrote: And, there can be considerable extra complexity to cool each of the modules properly.
Thanks for the post. It provides very detailed insight into the overall complexity, e.g. all those hose connections.
Anyone remember having water leaks around coolant hose connections on the old ICEVs or having to replace
a bad hose? Love to hear the labor cost from a GM dealer to replace a bad hose/clamp in the Bolt battery system.
Last edited by lorenfb on Wed Jun 12, 2019 8:15 am, edited 1 time in total.
#1 Leaf SL MY 9/13: 74K miles, 48 Ahrs, 5.2 miles/kWh (average), Hx=70, SOH=78, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 4.5K miles, 115 Ahrs, 5.5 miles/kWh (average), Hx=98, SOH=99, DOD > 20%, temp < 105F

danrjones
Posts: 365
Joined: Wed Apr 17, 2019 8:02 am
Delivery Date: 17 Jun 2019
Location: Ridgecrest, CA

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 8:15 am

At 6 am my battery temps were 92 and 89.4 max and min. That's with no charging. Plan to repeat tonight but with 2 hrs of lvl 2 from 3 to 5am.
2018 Leaf SV Pearl White with Tech and All Weather, Purchased New on 5/3/19

metricus
Posts: 94
Joined: Wed May 15, 2019 1:51 pm
Delivery Date: 28 Apr 2019
Leaf Number: 307046
Location: Reading, PA

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 8:48 am

lorenfb wrote:Thanks for the post. It provides very detailed insight into the overall complexity, e.g. all those hose connections.
Anyone remember having water leaks around coolant hose connections on the old ICEVs or having to replace
a bad hose?
LOL, yes I know.... I have a 1988 Ford Ranger which I keep just because I can fix everything on it myself. Rare bird!.

lorenfb
Posts: 2257
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 9:07 am

metricus wrote:
lorenfb wrote:Thanks for the post. It provides very detailed insight into the overall complexity, e.g. all those hose connections.
Anyone remember having water leaks around coolant hose connections on the old ICEVs or having to replace
a bad hose?
LOL, yes I know.... I have a 1988 Ford Ranger which I keep just because I can fix everything on it myself. Rare bird!.
Yes, being able to be a DIY type for many ICEV problems can be a repair cost saver. But not so much for a BEV, especially for future
potential cooling problems as depicted in the video. Adding a cooling system does increase the probability of a long term BEV
system failure. Many can remember when Tesla considered swapping batteries to reduce the vehicle's downtime versus charging,
consider that effect on reliability, totally laughable.
#1 Leaf SL MY 9/13: 74K miles, 48 Ahrs, 5.2 miles/kWh (average), Hx=70, SOH=78, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 4.5K miles, 115 Ahrs, 5.5 miles/kWh (average), Hx=98, SOH=99, DOD > 20%, temp < 105F

smkettner
Posts: 7376
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 10:01 am

danrjones wrote:At 6 am my battery temps were 92 and 89.4 max and min. That's with no charging. Plan to repeat tonight but with 2 hrs of lvl 2 from 3 to 5am.
Anyone know the optimum temperature?
Or the normal range for longest life?
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV
RAV4 traded in for I-Pace Dec 2018

LeftieBiker
Moderator
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Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: 2019 Leaf battery overheating

Wed Jun 12, 2019 10:51 am

smkettner wrote:
danrjones wrote:At 6 am my battery temps were 92 and 89.4 max and min. That's with no charging. Plan to repeat tonight but with 2 hrs of lvl 2 from 3 to 5am.
Anyone know the optimum temperature?
Or the normal range for longest life?
It probably isn't possible to get the best battery temps for both life and output in normal Summer weather. As low as is possible would have to do. IIRC lithium batteries like temps around 50-70F.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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