BMW’s next-gen EVs depend on an unassuming black box called ‘Heart of Joy’

Last November, I strapped into the rear passenger seat of an all-electric, four-door sedan with BMW test driver and 24-hour racer Jens Klingmann behind the wheel. It was a cold day at BMW’s Performance Driving Center in Greer, SC, and beneath the five-point harnesses, roll cage, and heavily camouflaged body, Klingmann had an unexpected co-pilot:

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