Battery pack including thermal spread inhibition structure

A battery pack comprising:

• a plurality of battery modules;
• a battery pack case configured to receive the plurality of battery modules;
• and
• a heat sink located under the plurality of battery modules,
• wherein each of the plurality of battery modules comprises:
• a plurality of battery cells;
• a water tank located above the plurality of battery cells, the water tank including a through-hole that is located in a first surface of the water tank that faces the plurality of battery cells;
• a module case configured to receive the plurality of battery cells and the water tank;
• and
• a sealing member located in the through-hole, the sealing member having a largest width at a portion located closest to the plurality of battery cells.