An exemplary traction battery retention assembly includes an attachment feature formed with a portion of an enclosure that houses a battery array. The attachment feature is sized such that a portion of the attachment feature can be received within an attachment feature of the battery array to hold the battery array within the enclosure. Another exemplary traction battery retention assembly includes a projection from an outer wall of a battery array. An attachment feature is formed with a portion of an enclosure that houses the battery array and includes an overhang surface to a surface of the projection to hold the array relative to the enclosure. Yet another traction battery pack assembly includes an enclosure of a battery pack that is formed together with a rib having sides extending to an end face. The rib extends to a structure housed within the enclosure.