LEAFfan
Posts: 4826
Joined: Fri Apr 23, 2010 6:08 pm
Delivery Date: 08 Jun 2011
Leaf Number: 1855
Location: Phoenix Area

Re: On cell specifications and battery charging characterist

Thu May 05, 2011 3:44 pm

Hmmm...me thinks 'WiseGuy' needs to change his nick. ;)
2013 LEAF SV Del. 2/28/13
2013 LEAF World Record for Most Miles Driven On One Charge-188 miles/8.8 m/kW h
4.8 kW DC PV ($ .91/W fully installed)/ Dec., 2010

WiseGuy
Posts: 4
Joined: Wed May 04, 2011 11:30 pm
Delivery Date: 05 May 2011

Re: On cell specifications and battery charging characterist

Fri May 06, 2011 12:32 am

I'd like to see what the "true capcity" discharge curve looks like, if the one that's published is a derated one. To me it looks exactly the same as all other LMO cell curves (which are not derated).

Let's close this disussion and wait for someone to actually do a 1/3C discharge of an actual cell, starting at 4.2V per cell, and end at 2.5V to prove the actual installed capacity.

AndyH
Posts: 6325
Joined: Fri Apr 23, 2010 3:43 pm
Location: San Antonio

Re: On cell specifications and battery charging characterist

Fri May 06, 2011 9:02 am

WiseGuy wrote:I'd like to see what the "true capcity" discharge curve looks like, if the one that's published is a derated one. To me it looks exactly the same as all other LMO cell curves (which are not derated).

Let's close this disussion and wait for someone to actually do a 1/3C discharge of an actual cell, starting at 4.2V per cell, and end at 2.5V to prove the actual installed capacity.

The 1/3C chart can be found above and on AESC's site, also linked above.

You pointed out correctly earlier that there's little energy at either end of the curve. So if one charges to 4.0V, 4.2, or 4.3, there won't be a significant difference in the curve - the only change will be in the initial voltage drop from 4.3V to the discharge slope. But there will be a significant loss of cycle life with the increased charge voltage.

More here in the 'wayback machine'.
Early pack capacity guestimates
http://www.mynissanleaf.com/viewtopic.php?p=12774
Freedom of Information Act request - EPA docs from Nissan (includes capacity info)
http://www.mynissanleaf.com/viewtopic.php?f=4&t=2433
Cell capacity per Nissan diagnostics computer
http://www.mynissanleaf.com/viewtopic.php?f=4&t=2823
Battery info from service manual
http://www.mynissanleaf.com/viewtopic.php?f=9&t=2085

Andy

bitflung
Posts: 19
Joined: Wed May 27, 2015 11:27 am
Delivery Date: 26 May 2015
Leaf Number: 023791
Location: Boston, MA

Re: On cell specifications and battery charging characteristics

Mon Apr 24, 2017 6:01 am

Bumping a 6 years old thread (sorry)

Experts from this thread and elsewhere: any thoughts on horrific internal resistance (as measured by the "Hx" value in LeafSPY)?

My 2012 LEAF SL gives me just 35 miles range from full charged to dead-on-the-side-of-the-road (max speed 50mph) and yet repeatedly passes Nissan's battery warranty test. Something ain't right. I'm down just one capacity bar but my Hx value is "60%". It also takes an exceedingly long time to quick charge (1.25 - 1.5 hrs to reach ~70% SOC).

I'm thinking high internal resistance is the culprit. I'm convinced that as a result I'm pumping much greater than 24kWh into the car to charge the battery (lots lost to heat) and effectively draining far more than the car's computer thinks I am (I still get ~3.7mi/kwh on the guessOmeter despite horrible range).

This car is a steaming pile and I'm not really interested in putting any money into it (good money after bad?) but I'm very curious whether anyone could help me prove to Nissan how badly they've F***ed me with this car. So far every service interaction has ended with, "your battery is fine, you must not know how to drive the car". Infuriating.

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