JPWhite
Well-known member
Herm said:43.68 angels can dance on the head of a pin
Is it OK (for the sake of argument) if I round that up to 44 angels dancing on a pin?
Herm said:43.68 angels can dance on the head of a pin
TonyWilliams said:JPWhite said:I hear what sounds like a fan kick in when I first plug up after a drive. I wouldn't be surprised if the LEAF keeps the battery ventilated during charging as required.
There is not active cooling on the batteries... no liquid, no air.
There is an electric liquid coolant pump to cool the charger, and fans for the radiators up front.
t all comes down to the Leaf's power pack lacking an active thermal management system, relying instead on a passive cooling set-up which, essentially, relies on a single fan to distribute heat evenly throughout the interior of the pack.
JPWhite said:Is that right?
Herm said:JPWhite said:Is that right?
That's right..
JPWhite said:Herm said:JPWhite said:Is that right?
That's right..
OK I'm willing to be corrected. What's your source of info on the lack of fan assisted cooling for the pack? All I have is media reports, what info do you have?
EVDRIVER said:The service manual shows all components. The internet is full of old bogus info and rumor.
Insulation works both ways, keeping out the heat as well as the cold...but you knew that. Since the unit is sealed, my guess is that the pack itself doesn't generate enough waste heat to worry about, even with insulation.Volusiano said:If they have an insulated version of the battery pack for cold weather, how are they going to uninsulate it for the hot summer? Wouldn't the insulation make the internal temperature hotter longer than the ambient temperature in the summer?
We always hear that heat is the enemy to the battery and people want to wait until the battery pack cools down enough after a drive before charging and all. Yet now we're guessing that the pack doesn't generate enough wasted heat to worry about, and that the insulation is useful to keep the ambient heat out because the trapped wasted heat will not exceed the ambient heat. Those are 2 contradicting guesses.davewill said:Insulation works both ways, keeping out the heat as well as the cold...but you knew that. Since the unit is sealed, my guess is that the pack itself doesn't generate enough waste heat to worry about, even with insulation.Volusiano said:If they have an insulated version of the battery pack for cold weather, how are they going to uninsulate it for the hot summer? Wouldn't the insulation make the internal temperature hotter longer than the ambient temperature in the summer?
The first one wasn't my guess, and I never bought it. The fact remains that Nissan feels comfortable adding insulation. Until someone discovers that they also added some sort of active (temperature dependent) cooling/venting, I have to assume trapped heat around the pack isn't a problem.Volusiano said:We always hear that heat is the enemy to the battery and people want to wait until the battery pack cools down enough after a drive before charging and all. Yet now we're guessing that the pack doesn't generate enough wasted heat to worry about, and that the insulation is useful to keep the ambient heat out because the trapped wasted heat will not exceed the ambient heat. Those are 2 contradicting guesses.
If I had to guess, I'd say the battery pack's wasted heat, if trapped by insulation, can easily exceed the ambient summer temperature quickly, and therefore needs to be vented off. So the insulation is not keeping out the ambient summer heat, but it's trapping in the internal wasted heat.
Volusiano said:We always hear that heat is the enemy to the battery and people want to wait until the battery pack cools down enough after a drive before charging and all.
Eric W: Thank you for contacting Nissan LEAF Consumer Affairs. How may I assist you?
JP White: Hi I've been reading the Owners Manual and have a question regarding some advice it gives......
Eric W: Go ahead.
JP White: ..... On page EV-22 it says to let the batery cool after use prior to charging. Does that apply even if the battery temp is in the normal range?
Eric W: The intention is not to attempt to charge the battery if the temperature of the battery is above a certain point at which charging could be detrimental to the battery.
JP White: Normally it maintains 'six bars' on the temperature gauge. Is that an acceptable temp to begin charging or should one wait anyway?
Eric W: Just a moment please.
JP White: k
Eric W: It should be acceptable to charge the vehicle if the battery temperature gauge shows that the battery is within normal range (between the blue and red gauge squares.
JP White: OK Thanks. That answers my question
Eric W: Is there anything else I can assist you with today?
JP White: No Thanks. I appreciate your help today.
Eric W: Thank you for contacting Nissan LEAF and have a good day.
EV-20
NISSAN recommends that you connect
the normal charge cable when getting
out of the vehicle, even if it is not going
to be used. By doing this, you can get
the most out of the remote climate
control and Climate Ctrl. Timer functions
the next time you use the vehicle
EV-22
Allow the vehicle and Li-ion battery to cool
down after use before charging.
Speaking of which, one of the two rovers, Opportunity, is still going strong eight years after landing. How is that for battery life?ericsf said:LOL. I am sure NASA has a paper about that too.
EV-20
NISSAN recommends that you connect
the normal charge cable when getting
out of the vehicle, even if it is not going
to be used. By doing this, you can get
the most out of the remote climate
control and Climate Ctrl. Timer functions
the next time you use the vehicle
EV-22
Allow the vehicle and Li-ion battery to cool
down after use before charging.
No wonder contradictions occur here, the message from Nissan is somewhat confusing.
JPWhite said:TonyWilliams said:There is not active cooling on the batteries... no liquid, no air.
There is an electric liquid coolant pump to cool the charger, and fans for the radiators up front.
Is that right?
TonyWilliams said:The protection for the batteries, temperature wise, are four temperature sensors on the battery assembly. When it detects an overtemp, the Lithium-Ion Battery Controller (LBC) enters Fail Safe Pattern A: No driving and charge stop. None of the individual temperature sensors have a fail safe mode, nor will there be an "EV system warning lamp".
The max sensor temperature is 55C/131F.
OK, then. How about 40 to 80% SOC or 2 to 10 bars? That should be pretty conservative.hill said:drum roll - - - - - - - -
But 40% is about 5 bars (assuming only 12 bars). If you count two "hidden bars" then 40% would about 6 bars (6/14 = 42%).surfingslovak said:OK, then. How about 40 to 80% SOC or 2 to 10 bars? That should be pretty conservative.
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