BATTERY UNIT AND BATTERY MODULE USING THE SAME

The invention provides a battery unit (1) and a battery module (2) including a plurality of battery units (1), the battery unit (1) including: a case (20) accommodating an electrode assembly (10) and having an opening (21); a cap plate (310) closing the opening (21) and having a terminal insertion portion (35, 36) penetrating the cap plate (310); a terminal member (320, 330) extending into the case (20) through the terminal insertion portion (35, 36); and a fixing member (340, 350) in the terminal insertion portion (35, 36), that fixes the terminal member (320, 330) to the cap plate (310), the fixing member (340, 350) being formed by an insert injection molding method in which a plastic resin is injected in the terminal insertion portion (35, 36) in a state in which the terminal member (320, 330) is inserted in the terminal insertion portion (35, 36), the fixing member (340, 350) including a recessed portion (340d, 350d) that is recessed from an upper surface (340a, 350a) of the fixing member (340, 350).