Patent ID: 8586226

Claim:
A battery module, which forms an item unit for construction of a battery assembly, comprising: a cell unit having a plurality of cells; a housing and a cover to store the cell unit; and a shaft member configured to receive a bolt there through, the shaft member inserted into a through-hole provided in the cover and further through a through-hole provided in the cell unit and further through a through-hole provided in the housing, wherein the shaft member comprises a length that allows protrusion beyond the housing and a lock member provided at an area where the shaft member protrudes beyond an outer surface of the housing and configured to lock the shaft member to the housing, wherein the lock member has a structure that is free to move between a first position where insertion of the lock member into the through-hole of the cell unit and into the through-holes of the housing and the cover is allowed and a second position where separation of the cell unit and the housing and the cover from the shaft member is prevented.