chennu
Posts: 26
Joined: Mon Jun 13, 2011 12:10 pm
Delivery Date: 15 Jun 2011
Leaf Number: 4145
Location: Portland; OR

How can I measure the battery pack temperature?

Wed Aug 15, 2012 10:20 pm

I have the SOCmeter (Gary's version) but dont think that measures battery temperature. This week (in Portland) the temperatures have been flirting with high 90's, so the Leaf is cooling its heels inside the garage while i drive my ICE car to work. I want to get a real-time reading of battery pack temperature to reduce my stress levels!

downeykp
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Posts: 632
Joined: Wed Nov 24, 2010 9:11 am
Delivery Date: 31 May 2011
Leaf Number: 1931
Location: Keaau, HI

Re: How can I measure the battery pack temperature?

Wed Aug 15, 2012 10:28 pm

If you are not driving it, why would there be stress?
2011 Black Leaf SL+QC Vin. 1931
Res. 6-14-10 Order 1-25-11
EVSE: Mod'd Ver. 2 Nissan L1
Delivered 5-31-11

8 years 33000mi. 7 bars

39 Suniva panels 10.3kw with Enphase micro inverters my electricity cost $26 a month.

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TonyWilliams
Posts: 10091
Joined: Sat Feb 19, 2011 1:48 am
Location: San Diego
Contact: Website

Re: How can I measure the battery pack temperature?

Wed Aug 15, 2012 10:53 pm

The upcoming LEAFscan will provide the temperature data from the battery.

gsleaf
Posts: 416
Joined: Tue Aug 17, 2010 9:49 pm
Delivery Date: 05 Aug 2012
Location: Portland, OR

Re: How can I measure the battery pack temperature?

Wed Aug 15, 2012 11:18 pm

chennu, I'm stressing about it too. I had my wife move it twice today to keep it in the shade at all times. It's going to be right around the 100's for Thursday/Friday. Fortunately it should be back to 80 by Saturday. I've never seen 7 bars which is good, but apparently the high 6's might be enough to do damage. :\

chennu
Posts: 26
Joined: Mon Jun 13, 2011 12:10 pm
Delivery Date: 15 Jun 2011
Leaf Number: 4145
Location: Portland; OR

Re: How can I measure the battery pack temperature?

Wed Aug 15, 2012 11:35 pm

If you are not driving it, why would there be stress?

This is not exactly how I envisioned my EV experience! I am having second thoughts about keeping my Leaf (purchased). I tend my keep my cars until they die and dont want to have to continually worry about temperature and range. I already lose range in winter because of low temperature (and needing to keep the heater on). Having to worry about high battery temperature in the summer is ridiculous..

chennu
Posts: 26
Joined: Mon Jun 13, 2011 12:10 pm
Delivery Date: 15 Jun 2011
Leaf Number: 4145
Location: Portland; OR

Re: How can I measure the battery pack temperature?

Wed Aug 15, 2012 11:38 pm

I've never seen 7 bars which is good, but apparently the high 6's might be enough to do damage. :\
the fact that 6 and 7 have high overlap is also not very helpful! even though I have not driven it in 72 hours, the bars dont go down below 6 (which makes sense, since the battery cannot go down below ambient, but still - this is another aspect to worry about. Cars are meant to be driven and not babied!!!

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ebill3
Posts: 1400
Joined: Fri May 27, 2011 1:23 pm
Delivery Date: 15 Sep 2011
Leaf Number: 7964
Location: Puyallup WA

Re: How can I measure the battery pack temperature?

Wed Aug 15, 2012 11:41 pm

Looks like mid nineties for the Puyallup area. I plan to use the LEAF as normal. About a 20 mile R/T in the morning, perhaps a few short runs in the afternoon. Remainder of time in the garage.

Without any scientific backing, I just don't think one or two days at elevated temperatures is going to be a battery killer.

There are sensors that can be attached to the battery - believe Tick Tock (?) has used them.

BTW, the cooling function of the climate control has been super during this hot spell, and at a miserly cost of energy.
All electric - red LEAF, green Tesla S. No ICE.

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surfingslovak
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Re: How can I measure the battery pack temperature?

Wed Aug 15, 2012 11:44 pm

ebill3 wrote:Without any scientific backing, I just don't think one or two days at elevated temperatures is going to be a battery killer.
That calls for an adult beverage. Cheers!

chennu
Posts: 26
Joined: Mon Jun 13, 2011 12:10 pm
Delivery Date: 15 Jun 2011
Leaf Number: 4145
Location: Portland; OR

Re: How can I measure the battery pack temperature?

Wed Aug 15, 2012 11:48 pm

ebill3 wrote:Looks like mid nineties for the Puyallup area. I plan to use the LEAF as normal. About a 20 mile R/T in the morning, perhaps a few short runs in the afternoon. Remainder of time in the garage.

Without any scientific backing, I just don't think one or two days at elevated temperatures is going to be a battery killer.

There are sensors that can be attached to the battery - believe Tick Tock (?) has used them.

BTW, the cooling function of the climate control has been super during this hot spell, and at a miserly cost of energy.
agree, but with the lack of any hard info from Nissan, i need to rely on my own measurements. hence my question! I really would like to understand the relationship between ambient temperature and battery pack temperature and any tool which allows me to do that while the summer lasts! if i cannot find anything, then the Leaf is going to be garaged until temperature comes down to the 70s!

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DaveEV
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Location: San Diego

Re: How can I measure the battery pack temperature?

Thu Aug 16, 2012 1:06 am

chennu wrote:agree, but with the lack of any hard info from Nissan, i need to rely on my own measurements. hence my question! I really would like to understand the relationship between ambient temperature and battery pack temperature and any tool which allows me to do that while the summer lasts! if i cannot find anything, then the Leaf is going to be garaged until temperature comes down to the 70s!
You are totally overthinking this.

Remember that as a general rule of thumb, for every 10C rise in temperature, the rate of capacity degradation over a time period will double.

3 days of 100F (38C) max temps instead of normal 80F (27C) temps might age your pack an extra 3-4 days than it would have otherwise otherwise. Big deal.

If you're really worried about it, park the car outside the garage over-night where it will generally be cooler by as much as 10F. Do this for a couple weeks and you'll have made up the high temps that you're currently experiencing (which are nothing compared to the 105-115F max 90F min temps Phoenix has seen so far for the month of August). Portland is on average 30F cooler than Phoenix so far this month - 100F vs 70F.

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