odysseus
Posts: 1
Joined: Thu Jul 11, 2019 11:33 am

the big cooling question

Thu Jul 11, 2019 11:37 am

Hi everyone,

I'm a newbie and about to buy my first Leaf.

I've read widely about how Nissan made a major design mistake in not providing for battery cooling in the Leaf, which limits speed and charge rate when the battery gets hot.

However, it's clear that the Leaf has a cooling system under the hood. So what is that used for? To cool the electric motor?

DougWantsALeaf
Posts: 525
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: the big cooling question

Thu Jul 11, 2019 1:54 pm

I have not hit a problem yet, in spite running a high battery temp during a 90+ degree day across Iowa. That said, there is a video from Germany, where he saw reduced charging at high temps.

Here in Chicago, we usually only get 5-10 90+F days a year (and its usually cooler at night), so its rarely a concern. If I lived in Phoenix, I might think about where I park my car before making a call. (if you are usually in a garage, your probably ok), but if in 120F sun every day, I might pick a Tesla with the overheat cooling, even though it costs a fair amount of range.
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: TBD

LeftieBiker
Moderator
Posts: 12226
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: the big cooling question

Thu Jul 11, 2019 2:58 pm

odysseus wrote:Hi everyone,

I'm a newbie and about to buy my first Leaf.

I've read widely about how Nissan made a major design mistake in not providing for battery cooling in the Leaf, which limits speed and charge rate when the battery gets hot.

However, it's clear that the Leaf has a cooling system under the hood. So what is that used for? To cool the electric motor?


The cooling system is for the onboard charger and inverter-controller. Older Leafs have a second loop for heat for the cabin, but from 2013 on it's just the one loop for the hotter electronic components. That can't be connected to the battery because it would often make it hotter rather than cooler.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

GerryAZ
Gold Member
Posts: 2157
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: the big cooling question

Sun Jul 14, 2019 11:49 am

The liquid cooling system cools the DC-DC converter, onboard charger, inverter, and electric motor. It is just liquid coolant circulated through the radiator and components so it can only cool the components to a little above ambient air temperature. This is ideal for power electronic modules and electric motors, but too hot for batteries. For the most part, other electric cars which have battery cooling systems use refrigeration compressors (usually integrated with air conditioning systems).
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

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