Battery pack

A battery pack, the battery pack comprising:

• at least one battery module having a plurality of battery cells arranged in one direction, the plurality of battery cells in the at least one battery module being electrically connected to one another;
• a housing surrounding the at least one battery module, the housing including:
• an inlet in a first surface of the housing, the first surface being opposite to a side surface of a battery module at one end of the housing, and
• an outlet in a second surface of the housing, the second surface being opposite to the inlet;
• and
• a first sealing member that extends along an entire perimeter of an edge portion of the side surface of the battery module at the one end of the housing, the first sealing member having an opening therethrough, wherein:
• the first sealing member is between the first surface of the housing and a battery module, the inlet and the outlet of the housing facing the opening in the first sealing member,
• the first sealing member is compressed, a volume of the compressed first sealing member being about 20% to about 50% of the volume of the first sealing member before the first sealing member is compressed,
• the battery module at the one end of the housing includes a side frame on the side surface thereof, and the first sealing member is only on a perimeter of the side frame,
• the first sealing member is between the first surface of the housing having the inlet and the battery module at the one end of the housing,
• a second sealing member is between adjacent battery modules, and
• a third sealing member is between the second surface of the housing having the outlet and a battery module at a second end of the housing that is opposite to the one end of the housing.