Patent ID: 8647764

Claim:
A battery pack comprising: a plurality of cylindrical battery cells arranged in a plurality of rows and a plurality of layers; a lower case for supporting said battery cells; a terminal case attached to said lower case and provided at one side surface with connection terminals for connection to an external apparatus; and a main circuit board attached to said terminal case and electrically connected to said battery cells, wherein; said lower case is formed with a plurality of support protrusions, said main circuit board included a plurality of support protrusion passing holes, which are each larger in diameter than each of said plurality of support protrusions, and an end of each of said plurality of support protrusions is passed entirely through a respective one of each of said plurality of support protrusion passing holes and said end of each of said plurality of support protrusions is in direct physical contact with at least one of said battery cells, wherein; each of said plurality of support protrusions are cylindrical in shape and each of said plurality of support protrusion passing holes are square in shape.