The present disclosure generally pertains to secondary batteries and components thereof. More specifically, the disclosure relates to According to a first aspect the present disclosure relates to a cylindrical secondary cell (1) comprising a cylindrical can (2) having a can end wall (2a), a terminal part (4) and an isolating part (7). The terminal part (4) comprises a pin shaped body inserted into a terminal through-hole (2b) formed in the can end wall (2a). The isolating part (7) is arranged in the terminal through-hole (2b) to electrically isolate the can end wall (2a) from the terminal part (4). An inner corner (2d) that is formed where an inner peripheral surface (2c) meets an inner surface (2f) of the can end wall (2a), is blunted and has a surface free from edges having edge angles of less than 100 degrees. The disclosure also relates to a method for attaching a terminal part to the shaped can end wall (2a) in a process of assembling the cylindrical secondary cell (1).