mkjayakumar
Posts: 1219
Joined: Thu Mar 08, 2012 9:13 am
Delivery Date: 08 Mar 2012
Location: Plano, TX

Re: Charging from 80% to 100% -- What's the issue?

Wed Mar 28, 2012 9:43 am

Measure with a Caliper
Mark with a Chalk
Cut it with an Axe

User avatar
DaveEV
Forum Supporter
Posts: 6239
Joined: Fri Apr 23, 2010 3:51 pm
Location: San Diego

Re: Charging from 80% to 100% -- What's the issue?

Wed Mar 28, 2012 11:52 am

Ingineer wrote:Here are some other parameters from the Battery ECU after that "full" charge on my Leaf:

Code: Select all

SoC: 94.591%    (Current State of Charge)
Lvl: 22.240kWh  (Current Level, i.e. 278 Gids)
Ful: 67.568Ah   (Full Capacity)
Tmp: 72.3f   	(Battery Temp)
Vlt: 393.23v 	(Battery Voltage)
CLC: 1.030   	(Grad Cap Loss Coef)
CLM: 1.005   	(Grad Cap Loss Mtr)
CPL: 92.3kW  	(Charge Power Limit)
RPL: 41.6kW  	(Regen Power Limit)
DPL: 110kW   	(Discharge Power Limit)
Very nice - could you clarify a few of the parameters, specifically the CLC and CLM?

What is CPL - surely with a full battery it's not indicating that you can charge the pack at 92 kW? I'm also surprised that the RPL is so high with a full battery, would have thought it would be way less than 10 kW...

User avatar
Ingineer
Posts: 2741
Joined: Fri Oct 15, 2010 1:09 pm
Delivery Date: 13 Jul 2011
Leaf Number: 6969
Location: Berkeley, California
Contact: Website

Re: Charging from 80% to 100% -- What's the issue?

Wed Mar 28, 2012 12:28 pm

drees wrote:
Ingineer wrote:Here are some other parameters from the Battery ECU after that "full" charge on my Leaf:

Code: Select all

SoC: 94.591%    (Current State of Charge)
Lvl: 22.240kWh  (Current Level, i.e. 278 Gids)
Ful: 67.568Ah   (Full Capacity)
Tmp: 72.3f   	(Battery Temp)
Vlt: 393.23v 	(Battery Voltage)
CLC: 1.030   	(Grad Cap Loss Coef)
CLM: 1.005   	(Grad Cap Loss Mtr)
CPL: 92.3kW  	(Charge Power Limit)
RPL: 41.6kW  	(Regen Power Limit)
DPL: 110kW   	(Discharge Power Limit)
Very nice - could you clarify a few of the parameters, specifically the CLC and CLM?

What is CPL - surely with a full battery it's not indicating that you can charge the pack at 92 kW? I'm also surprised that the RPL is so high with a full battery, would have thought it would be way less than 10 kW...
All I have are educated guesses on most of this information, it's simply as enumerated by the Battery ECU. Most of it is quite obvious, but some things are not updated all the time. For instance, the RPL is showing high, because the car has not been made "Ready" yet after charging. This parameter doesn't get set until then.

The CPL is for CHAdeMO charging, and acts to limit the maximum power into the battery. The "Grad Cap Loss Coef" is Nissan's exact Label for CLC. I think it means Gradual Capacity Loss Coefficient. "Grad Cap Loss Mtr" (CLM) is likely Gradual Capacity Loss Meter, which is what is used by the 12 bar capacity display to show loss. If this is indeed the case, I would assume this means my battery is actually at 103% but reporting 100%. However until we see more cars we can't know for sure. So far the few cars I've studied have all had the same numbers, which seems to show for the most part (sorry TickTock!) AESC builds very consistent cells.

We've already had one report of flaky behavior from a battery that was repaired under warranty. Apparently a loose "ground connection" was to blame that was causing the charging to stop intermittently.

-Phil
Easily Learn Electricity HERE! - - - - Website: http://evseupgrade.com/[/size] - - - - Like us on Facebook: EVSE Upgrade

Return to “Batteries & Charging”