Section 939 (Battery System): THERMOWRAP: Operation
WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
The thermowrap protects the battery from engine compartment temperature extremes. The temperature of the battery can affect battery life. The air trapped in the padded material of the thermowrap creates a dead air space, which helps to insulate the sides of the battery case from the air temperature found in the surrounding engine compartment.