kovadam
Posts: 14
Joined: Wed Jun 06, 2018 12:07 am
Delivery Date: 28 Sep 2018
Location: Hungary, Europe

Re: The 40KWH Battery Topic

Wed Oct 17, 2018 12:19 am

The BMS is on the left side (driver side for non UK cars), it is visible also in older videos and in the new 40kWh dismount video made by EVs Enhanced. However none of those videos/pictures can you see such a device on the right side of the battery pack. Inside there is nothing just a vertical holder which holds the read battery line.

A fan would be good there to vent the hot air out from the battery pack in case the ambient air temp is lower than the inside temp of the battery pack. If you continuously remove the hot air, it will help to reduce the battery pack temperature to ambient temp in a short period of time (like 1-2 hours depending of the temp difference between pack & ambient air temp). Of course it is only working for milder climate, not for hot desert, however parking the car in a cool place (A/Ced garage, etc), could help to reduce the battery pack temperature. The problem is the condensation what you might get if you let outside air inside the battery pack...

WetEV
Posts: 2349
Joined: Fri May 04, 2012 8:25 am
Delivery Date: 16 Feb 2014
Location: Near Seattle, WA

Re: The 40KWH Battery Topic

Wed Oct 17, 2018 7:33 am

kovadam wrote:A fan would be good there to vent the hot air out from the battery pack in case the ambient air temp is lower than the inside temp of the battery pack. If you continuously remove the hot air, it will help to reduce the battery pack temperature to ambient temp in a short period of time (like 1-2 hours depending of the temp difference between pack & ambient air temp).


With a large enough fan, sure. Perhaps you might calculate how large the fan is needed?

Note that as the temperature difference gets smaller, the amount of heat removed gets smaller. So you might halve the temperature difference in X time, quarter it in 2*X time, 1/8 in 3*X time, 1/16 in 4*X time... Never goes to no difference from ambient, unless ambient temperature changes, of course.
WetEV
#49
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red (Totaled)
2014 Leaf SL Red

GRA
Posts: 9401
Joined: Mon Sep 19, 2011 1:49 pm
Location: East side of San Francisco Bay

Re: The 40KWH Battery Topic

Wed Oct 17, 2018 4:47 pm

WetEV wrote:
kovadam wrote:A fan would be good there to vent the hot air out from the battery pack in case the ambient air temp is lower than the inside temp of the battery pack. If you continuously remove the hot air, it will help to reduce the battery pack temperature to ambient temp in a short period of time (like 1-2 hours depending of the temp difference between pack & ambient air temp).


With a large enough fan, sure. Perhaps you might calculate how large the fan is needed?

Note that as the temperature difference gets smaller, the amount of heat removed gets smaller. So you might halve the temperature difference in X time, quarter it in 2*X time, 1/8 in 3*X time, 1/16 in 4*X time... Never goes to no difference from ambient, unless ambient temperature changes, of course.

H'mm that's quite a paradox, Zeno! ;)
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

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LeftieBiker
Posts: 9592
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Wed Oct 17, 2018 7:03 pm

H'mm that's quite a paradox, Zeno! ;)


And in this case it really dose prove that Nissan packs never cool off.
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2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
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