DETROIT--The long warranty--eight years or 100,000 miles--on the Chevrolet Volt battery got the headline last week. But the battery's liquid heating and cooling system helped make it possible.
Batteries last longer and perform better when they avoid extremes of hot and cold. And because liquid cooling systems are more compact than air-cooled systems, General Motors Co. engineers had room for more battery cells.
The Volt hybrid, which goes on sale late this year, can drive 40 miles on the battery. Then a gasoline engine kicks in to generate electricity for the motor.
Standard auto coolant circulates … Read more