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No, it won't hurt an EV, whether it's plugged in or not. You'll just lose power.
If we ever got a blast big enough to do that kind of damage, the car wouldn't have to be plugged in to be damaged, and same goes for most other electrical devices across North America (including ICE cars). That sort of event would more likely to be due to a high-altitude nuclear detonation than the sun.
Either way, the end of civilization will be more important to you than your car.
Mitsubishi Motors Corp. announced Monday that the company plans to market a device that enables i-MiEV electric cars to supply power to home electric appliances such as rice cookers in emergencies by the end of this year.