Re: The 40KWH Battery Topic
Posted: Mon Sep 09, 2019 11:33 am
It may just be an illustration of how heat moves through the pack, or it may be an artifact of the sensor location, or even of how they are manufactured...
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It may just be an illustration of how heat moves through the pack, or it may be an artifact of the sensor location, or even of how they are manufactured...
At lunch the spread was back to about 2 deg F, about 82.8 and 80.8. As you say, maybe the spread is caused by the lag as the outside (or some part of the battery) cooled at night faster than the inside. For the first time in about 4 months we got down to a bone chilling 60 F last night.LeftieBiker wrote: ↑Mon Sep 09, 2019 11:33 amIt may just be an illustration of how heat moves through the pack, or it may be an artifact of the sensor location, or even of how they are manufactured...
I think its sensor location. I let mine sit more than 12 hours and the temps begin to merge occasionally within one degree. But get out and drive it and one will quickly diverge from the pack when the pack heats up getting to as much as 20º difference with 10+ being typical. Made me think there was some sort of circulation causing this, speaking of which.LeftieBiker wrote: ↑Mon Sep 09, 2019 11:33 amIt may just be an illustration of how heat moves through the pack, or it may be an artifact of the sensor location, or even of how they are manufactured...
DaveinOlyWA wrote: ↑Tue Sep 10, 2019 6:37 amI think its sensor location. I let mine sit more than 12 hours and the temps begin to merge occasionally within one degree. But get out and drive it and one will quickly diverge from the pack when the pack heats up getting to as much as 20º difference with 10+ being typical. Made me think there was some sort of circulation causing this, speaking of which.LeftieBiker wrote: ↑Mon Sep 09, 2019 11:33 amIt may just be an illustration of how heat moves through the pack, or it may be an artifact of the sensor location, or even of how they are manufactured...
A bombshell comment made by a VERY reputable person from Nissan stating 62 kwh packs now have circulation fan. Still waiting on more details on that.
Maybe a dumb question, but could one of the three temp sensors (I only see three), could it be on the motor?
I saw that post, but I don't really believe it. It is true that I see my Plus battery pack heat up much less than my 30 or 40kWh packs did, even with multiple long fast charging sessions, but I have mostly attributed that to the lower C rate. On my last long trip, our second charge lasted 55 minutes and we gained over 40kWh to a 94% SoC, which suggests that we were getting close to the full 44kW rate of the charger up to ~90% SoC. Even then, we only had 8 temperature bars. I'm afraid I neglected to get a LeafSpy reading at that point. Still, I didn't hear any sort of fan noise coming from the car, so if there is a fan, I can't imagine it's doing much.DaveinOlyWA wrote: ↑Tue Sep 10, 2019 6:37 amA bombshell comment made by a VERY reputable person from Nissan stating 62 kwh packs now have circulation fan. Still waiting on more details on that.
But there is two ways to read that - that Leaf plus's have a fan, or that "now" they have a fan, meaning some plus's did not and new ones do?Astros wrote: ↑Tue Sep 10, 2019 12:56 pmI saw that post, but I don't really believe it. It is true that I see my Plus battery pack heat up much less than my 30 or 40kWh packs did, even with multiple long fast charging sessions, but I have mostly attributed that to the lower C rate. On my last long trip, our second charge lasted 55 minutes and we gained over 40kWh to a 94% SoC, which suggests that we were getting close to the full 44kW rate of the charger up to ~90% SoC. Even then, we only had 8 temperature bars. I'm afraid I neglected to get a LeafSpy reading at that point. Still, I didn't hear any sort of fan noise coming from the car, so if there is a fan, I can't imagine it's doing much.DaveinOlyWA wrote: ↑Tue Sep 10, 2019 6:37 amA bombshell comment made by a VERY reputable person from Nissan stating 62 kwh packs now have circulation fan. Still waiting on more details on that.
Yes, but some part of the battery (or whatever is monitored) heats up much faster than the rest.LeftieBiker wrote: ↑Tue Sep 10, 2019 12:03 pmMaybe a dumb question, but could one of the three temp sensors (I only see three), could it be on the motor?
Most things are possible, but I doubt that this one is true.
I guess that's possible, but this rumor has existed for a long time, and was just recently repeated by someone who ought to know more than us. Sometimes it seems the people closest to Nissan have drunk too much off the Kool-Aid, and stubbornly believe Nissan PR over anything else. Look at the reactions by Nissan insiders to Rapidgate.