Battery module ensuring airtightness for HV terminal, and battery pack comprising same

A battery module comprising:

• a plurality of battery cells;
• a battery module case configured to accommodate the plurality of battery cells, the battery module case having an opening having a screw thread at one side;
• a high voltage (HV) terminal electrically connected to electrode leads of the plurality of battery cells, the HV terminal having an insertion groove having a diameter that is smaller than a diameter of the opening;
• and
• a sealing part inserted and fastened to the opening of the battery module case, the sealing part having a screw thread configured to engage the screw thread of the opening, the sealing part having a first end contacting the HV terminal and a second end exposed at an external side of the battery module case, the first end of the sealing part being inserted into the insertion groove, a diameter of a portion of the first end of the sealing part being smaller than a diameter of the opening and larger than the diameter of the insertion groove, and a diameter of the second end of the sealing part being greater than a diameter of the opening such that the sealing part has a two-step shape,
• wherein the sealing part is configured to allow the HV terminal to be electrically connected externally through the battery module case.