An electrode terminal (20) includes a first portion (21) and a second portion (22) arranged in a first direction (X). The first portion (21) is connected to the electrode assembly (10) and has a first connection region (211), and the second portion (22) is connected to the electrode assembly (10) and has a second connection region (221). The sealing member (30) is connected to the electrode terminal (20) and disposed on one side of the electrode assembly (10) in a second direction (Y), and the first direction (X) is perpendicular to the second direction (Y). In an extension direction of the electrode terminal (20), the first connection region (211) has a first edge (2111) away from the sealing member (30) and a second edge (2112) close to the sealing member (30), and the second connection region (221) has a third edge (2211) away from the sealing member (30) and a fourth edge (2212) close to the sealing member(30), where a minimum distance between the first edge (2111) and the third edge (2211) is Di, a minimum distance between the second edge (2112) and the fourth edge (2212) is D, and at least one of D or D is greater than 0. In this application, tension regions of the electrode terminal (20) and the electrode assembly (10) are separated, improving the reliability of the secondary battery (100).
