Last year battery in our Factory Edge failed.
Wife was driving down the road and smelled what you smelled. Pulled over cut the engine off opened the hood but didn't know what was wrong. Found a small reapir shop down the hill. He saw the battery was hot and boiling and about to explode.
Replaced it with a NAPA which would not hold enough charge to start the car first of this month,result in cascading visiting Ford Dealers in Russelville Ark, Shawnee Oklahoma, and Camping World, in Oklahoma City, and For Dealer in Texas.
New Battery, radiator fan, rewiring the car at CW, and water pump in Texas.
Take too long for all the details but about $4,000.00 from a bad new battery!