skyguy_6153
Posts: 35
Joined: Sat Jun 20, 2015 4:55 am
Location: Tallahassee, Florida

Re: Adding Extra Battery Power to FFE

Mon Jan 03, 2022 1:20 pm

The Focus Electric (2012-2016 model years) uses LGX P1 cells, and more info on these cells can probably be found from the endless sphere forum page. I I'd like to make a pack out of cylindrical cells, as that would rid the issue of cell expansion that FFEs have. I wonder if you found some cells that were higher in energy density, but had the same full discharge/ full charge ratings as the OEM battery, could you still utilize the OEM BMS? Or would the boards built into the modules need to be removed and reused on the diy battery....
2012 Focus Electric with DIY P0A0A fix "coolant leak inside battery" (removed coolant hoses, heat exchangers, and cooling assembly from upper battery pack) over 16,000+ miles and no problems yet :D Thanks to Tareq Awad and Sebastian Zuzga!

Anti_Climax
Posts: 312
Joined: Fri May 20, 2016 12:22 pm
Location: The Valley of the Sun

Re: Adding Extra Battery Power to FFE

Mon Jan 03, 2022 3:29 pm

You'd probably need the boards or you'd have to be able to recreate the data stream the BMS expects to see.
2012 Candy Blue FFE
33.5kWh battery pack
CHAdeMO DC Fast Charging

triangles
Posts: 1196
Joined: Tue Aug 16, 2011 11:40 am
Location: Toledo, Ohio
Contact: Website

Re: Adding Extra Battery Power to FFE

Wed Jan 12, 2022 9:54 am

Anti_Climax wrote:
Mon Jan 03, 2022 3:29 pm
You'd probably need the boards or you'd have to be able to recreate the data stream the BMS expects to see.
And that is my big stumbling block.

Someday if ever feasible, I will upgrade my battery. The battery part and BMS part is no problem. However I'm a complete noob when it comes to canbus or knowing what the car expects from the battery modules.

It would be awesome if there was an easy way to just ditch the OEM battery and build a custom battery that just "plugs into" the FFE.
2014 Blue Candy FFE
http://www.fuelly.com/car/ford/focus/2014/triangles/303811 (since this forum doesn't allow BBcode in sigs)

skyguy_6153
Posts: 35
Joined: Sat Jun 20, 2015 4:55 am
Location: Tallahassee, Florida

Re: Adding Extra Battery Power to FFE

Wed Jan 12, 2022 11:52 am

triangles wrote:
Wed Jan 12, 2022 9:54 am
Anti_Climax wrote:
Mon Jan 03, 2022 3:29 pm
You'd probably need the boards or you'd have to be able to recreate the data stream the BMS expects to see.
And that is my big stumbling block.

Someday if ever feasible, I will upgrade my battery. The battery part and BMS part is no problem. However I'm a complete noob when it comes to canbus or knowing what the car expects from the battery modules.

It would be awesome if there was an easy way to just ditch the OEM battery and build a custom battery that just "plugs into" the FFE.
Look into Arduino products and shields for an easy learning route to sniffing the CAN. I started with my FFE using a Arduino Uno and a Sparkfun Can Bus Shield, but as soon as I ran the code, the car threw just about every warning it could generate (SSN, ABS, Low Tire Pressure, etc.). Luckily, I have Forscan to clear the errors, which were Can Bus related. Anyway, I think it may be due to not having the fuses for the traction control/ABS and pedestrian speaker installed :lol: . I will however be trying again in me free time with fuses installed.

SparkFun CanBus Shield: https://www.sparkfun.com/products/13262

SparkFun LCD: https://www.sparkfun.com/products/9395

Arduino Uno: https://www.sparkfun.com/products/11021

OBD2 to DB9 Cable (Needed for connecting the board to the OBD2 port.): https://www.sparkfun.com/products/10087
2012 Focus Electric with DIY P0A0A fix "coolant leak inside battery" (removed coolant hoses, heat exchangers, and cooling assembly from uppe
2012 Focus Electric with DIY P0A0A fix "coolant leak inside battery" (removed coolant hoses, heat exchangers, and cooling assembly from upper battery pack) over 16,000+ miles and no problems yet :D Thanks to Tareq Awad and Sebastian Zuzga!

Anti_Climax
Posts: 312
Joined: Fri May 20, 2016 12:22 pm
Location: The Valley of the Sun

Re: Adding Extra Battery Power to FFE

Thu Jan 13, 2022 6:54 am

Connecting your CAN+ and CAN- backwards will do that too, as will having a termination resistor on the loop when another is already in elsewhere.
2012 Candy Blue FFE
33.5kWh battery pack
CHAdeMO DC Fast Charging

Return to “Engineering Forum”