I had wondered about overheating of EVs when seriously pushed on track. But that´s not very different to ICEs wich are intended for road use, they also overheat, the engine or the brakes, quite easily
Problem with EVs is just the battery, and I guess for economy reasons as there are batteries wich can be depleted much faster than any EV can deplete its battery. A battery depleted in 45 minutes means it´s been discharged at an average of 1.5C, so peaks must be around 3-4C as much.
Just as a reference, I fly racing drones wich battery (Lipo, not LiIon) are depleted even in less than 2 minutes, wich is an average above 30C with peaks close to 100C (I´ve measured 140A for a 1.5Ah battery). LiIon are different, they can´t take those very high discharging rates, but I don´t think 5C are out of reach for the technology, just that it´s not worth using those batteries for a road car, they´re more expensive, and heavier, and on a road car and normal use people will never deplete the whole battery, from full charge to empty, under 30 minutes, so they use batteries with lower discharging rate so battery cost does not scale up even more
I´ve repeated this ad-nauseam, but when some new battery technology is finally released, ICE will simply dissapear. Only that I´m waiting for this for around a decade now, and still...