Embodiments of the present disclosure provide a battery pack, a battery module and an output electrode base. The output electrode base includes a base body and a connector, and the connector is a metal structure; the connector includes a securing member and a connecting post, the securing member is secured in the base body, and the connecting post protrudes from the base body; an output electrode connection piece of the battery module is provided with a first installing hole, and the connecting post passes through the first installing hole to be connected with the output electrode connection piece.