SECONDARY BATTERY AND BATTERY MODULE

Provided is a secondary battery, which includes a first terminal, a second terminal, a top cover plate, an electrode assembly, a connecting piece and a deformable plate, the electrode assembly comprises a first and a second electrode plate and a separator therebetween; at least one of the first and second terminal is insulatedly arranged from the top cover plate; the connecting piece is electrically connected with the second terminal; in a normal state, the first electrode plate is electrically connected with the first terminal through the deformable plate, the second electrode plate is electrically connected with the second terminal; when an internal pressure of the secondary battery exceeds a reference pressure, the deformable plate deforms to interrupt an electrical connection with the first electrode plate, the deformable plate after deforming is electrically connected with the connecting piece, so that the first terminal is electrically connected with the second terminal.