The present invention relates to a weldless battery module or battery pack configured such that a battery cell and a busbar are electrically connected to each other using a pogo-pin without welding. The battery module includes a plurality of cylindrical battery cells, a module case accommodating the plurality of cylindrical battery cells therein, a cover coupled to at least one of open surfaces of the module case, busbars coupled to the cover, and a pogo-pin interposed between each of the plurality of cylindrical battery cells and a corresponding one of the busbars for electrical connection.