Patent ID: 8776905

Claim:
A device for preventing fire in a battery pack used in an electric vehicle, comprising: a battery pack housing installed and configured to cover the battery pack, the battery pack housing including an inlet and an outlet to circulate air therein; a fire sensor disposed in the battery pack housing and configured to sense one or more gases when fire occurs in the battery pack; a damper disposed in each of the inlet and the outlet and configured to selectively open and close the inlet and the outlet depending upon whether or not gas has been sensed; and a controller configured to transfer an opening signal or a closing signal to the damper depending on whether the fire sensor senses gas or not, wherein the damper includes: a rotational shaft installed across an inside of each of the inlet and the outlet; a cut-off plate configured to rotate together with the rotational shaft and formed so that an outer periphery of the cut-off plate corresponds to inner peripheries of the inlet and the outlet when the damper is shut; and an actuator connected to the rotational shaft and configured to transfer a rotational force to the rotational shaft upon receiving a signal from the controller.