lorenfb
Posts: 1755
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: Extra Battery, How to Integrate with 24kWh Traction Battery?

Thu Jun 07, 2018 8:31 pm

mux wrote:In the Leaf, the rapid charger does its own current limiting; all the car does is set a maximum current (120A in the case of Leaf) and a maximum voltage (391V in case of the Leaf). The charger then does constant current-constant voltage (CCCV) charging just like any other battery charger.


The first description/senctence better defines the functionality, since the voltage of the battery increases as it charges. So it's not really a constant
voltage source too during the constant current charging, but limits the max battery voltage as the process completes.
Leaf SL MY 9/13: 65K miles, 50 Ahrs, 5.2 miles/kWh (average), L2 charges to 100% > 1000, max battery temp < 95F, min discharge point > 20 Ahrs

arnis
Posts: 867
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Extra Battery, How to Integrate with 24kWh Traction Battery?

Fri Jun 08, 2018 8:51 am

Vehicle asks for specific current and DC charger deploys that. AFAIK 10x per second.
It's not CC CV. Vehicle is not limiting according to pack voltage.
Vehicle is limiting according to maximum cellpair voltage.

Current from DC station varies up and down. Enabling AC for example. Current rises
as peak voltage per cellpair allows more current. And station ramps up.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

Return to “Engineering”