THERMAL MANAGEMENT SYSTEM FOR A FUEL CELL ELECTRIC VEHICLE AND A METHOD FOR CONTROLLING SAME

A thermal management control apparatus includes: a stack cooling line configured to cool a fuel cell stack of the fuel cell electric vehicle; a battery cooling line configured to cool a battery of the fuel cell electric vehicle; a heat exchanger configured to exchange heat between a stack coolant of the stack cooling line and a battery coolant of the battery cooling line; a valve configured to control an inflow of the stack coolant to the heat exchanger; and a control apparatus. The control apparatus is configured to diagnose whether a component of the valve or the battery cooling line has failed when the battery is overheated and to control a fuel cell output to cool the stack coolant and cool the battery by using a temperature of the stack coolant when a failure of the valve or a component failure of the battery cooling line occurs.