CAP ASSEMBLY AND SECONDARY BATTERY

The present disclosure relates to a cap assembly (30) and a secondary battery (100). The cap assembly (30) includes a cap plate (31), an electrode terminal, a fixing member (33) and a connection member (34). The cap plate (31) includes an electrode lead-out hole (311), the electrode terminal includes a terminal board (32), the terminal board (32) is located at a side of the cap plate (31) and covers the electrode lead-out hole (311), the fixing member (33) at least partially surrounds the terminal board (32) to fix the terminal board (32) to the fixing member (33), the connection member (34) is separated from the electrode terminal by the fixing member (33), and the connection member (34) is connected with the cap plate (31). The connection member (34) includes a main body (341), the main body (341) is provided with a first groove (341c) opened downwardly along a top of the main body (341), and a part of the fixing member (33) is located in the first groove (341c). The terminal board (32) of the embodiments of the present disclosure is firmly fixed to the cap plate (31) through the connection member (34) and the fixing member (33), which reduces the possibility of separation between the terminal board (32) and the cap plate (31), thereby improving the safety of a structure of the secondary battery (100).