By Luc Olinga Young electric-vehicle maker Rivian has struggled to increase production rates. It is an understatement to say that Rivian is going through a tough period. The young electric-vehicle manufacturer has just poured cold water on investors’ hopes by announcing a pessimistic outlook for 2022. And worse, Rivian did not give the impression that it had solved its biggest problem: how to produce a lot of cars to satisfy growing demand for electric vehicles. On the contrary, Rivian said it could produce as many as 50,000 vehicles at its site in Normal, Ill,, but would manufacture only half…