NOVELTY - A battery module assembly comprises an end cap (118) comprising a conductive aluminum portion and an insulating polypropylene portion (122) and conductively coupled to an electrochemical cell body (124) functioning as a terminal (120) and conductively coupled to an electrode (136) via a pressure relief portion. The insulating portion prevents formation of a conductive coupling between the body and the electrode when the pressure relief portion is in the deployed position.    USE - For a battery system of a vehicle, e.g. automobile, motorcycle, bus, recreational vehicle, boat.    ADVANTAGE - The battery module assembly has a containment structure to accommodate a break-away vent portion and permit gases to escape in the event of over-pressure conditions within a battery cell.    DETAILED DESCRIPTION - A battery module assembly comprises electrochemical cell(s) (116) comprising a terminal conductively coupled to an electrode and a body portion functioning as a second terminal and conductively coupled to a second electrode via a pressure relief portion. An end cap comprising a conductive aluminum portion and an insulating polypropylene portion is conductively coupled to the body portion. The pressure relief portion separates from the body portion to a deployed position when a pressure within the body portion reaches a predetermined level to break the conductive coupling between the body portion and the second electrode. The insulating portion prevents formation of a conductive coupling between the body portion and the second electrode when the pressure relief portion is in the deployed position.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-section of a portion of the battery module assembly.    Cells (116)    End cap (118)    Terminal (120)    Insulating polypropylene portion (122)    Body (124)    Lid (128)    Cylindrical side wall (130)    End wall (132)    Vent (134)    Electrode (136)    Insulator (142)    Sidewall (144)    Electrode roll (160)    Insulator cap (162)    Extending portion (166)    Groove (170)    Ridge (172)    Channel (174)