Welding process for sealing a battery module

A battery module, comprising:

• a housing having a main body with a first protruding shelf disposed along a first external surface perimeter of the housing and a second protruding shelf disposed along a second external surface perimeter of the housing;
• the first protruding shelf having a first protrusion and a first lip extended from and substantially orthogonal to the first external surface perimeter and substantially parallel to one another along the first external surface perimeter, with the first protrusion surrounded by the first lip and the first protrusion extended a first distance above the first lip with respect to the first external surface perimeter;
• the second protruding shelf having a second protrusion and a second lip extended from and substantially orthogonal to the second external surface perimeter and substantially parallel to one another along the second external surface perimeter, with the second protrusion surrounded by the second lip and the second protrusion extended a second distance above the second lip with respect to the second external surface perimeter;
• an electronics compartment cover configured to be in contact with the housing along the first protrusion and positioned the first distance over the first lip;
• and
• a cell receptacle region cover configured to be in contact with the housing along the second protrusion and positioned the second distance over the second lip.