Patent ID: 8124263

Claim:
A battery pack housing member configured to be integrated into a battery pack, the battery pack housing member comprising: an interior surface partially defining an interior region of said battery pack; and a plurality of cell mounting wells formed within said interior surface of said battery pack housing member, wherein each cell mounting well of said plurality of cell mounting wells is adapted to receive a first end portion of a corresponding cell of a plurality of cells, wherein said first end portion includes a cap assembly comprised of a battery terminal, and wherein each of said plurality of cell mounting wells further comprises; a central through-hole configured to receive said battery terminal of said corresponding cell, wherein said cell mounting well has a single opening, said single opening comprised solely of said central through-hole; an annular ring encircling said central through-hole, said annular ring configured to support a complementary surface of said cap assembly of said corresponding cell; a gap formed between at least one inner surface of said cell mounting well and a corresponding region of said cap assembly of said corresponding cell, said gap encircling said annular ring, and wherein said gap is further defined by a union of said annular ring and said complementary surface of said cap assembly; a sealant disposed within said gap, said sealant forming a watertight seal between said cell mounting well and said corresponding region of said cap assembly of said corresponding cell wherein each cell of said plurality of cells is further comprised of a cell case, said cell case having a lateral outer surface and an end surface, said end surface comprised of a central opening, wherein said cap assembly closes said central opening, wherein an insulator is interposed between said cap assembly and said central opening of said case, and wherein said gap is further defined by said end surface of said cell case and a corresponding surface of said cell mounting well; and said sealant forms a watertight seal between an exposed portion of said insulator and said cell mounting well.