I hate the "electric cars are all about software" meme. You need a PWM thingy to work as a motor controller / switching converter. And a charge controller with

I hate the "electric cars are all about software" meme. You need a PWM thingy to work as a motor controller / switching converter. And a charge controller with a little bit of ramp up/down logic. And a temperature controller hooked into the heat pump, battery coolant, motor coolant, and cabin radiator(s). You should be able to do the whole thing with a bunch of power FETs, some LM-series chips, and maybe an 8051 microcontroller.