A secondary battery top cover assembly, characterized in comprising: a top cover plate; an electrode terminal (204, 206) disposed on the top cover plate; an insulating cover; and a short-circuit component comprising a deformable plate and a conductive plate disposed above the deformable plate, wherein the deformable plate is connected to the top cover plate, and the conductive plate is connected to the electrode terminal (204, 206); wherein the conductive plate comprises a body portion and a protruding portion protruding upwardly from the body portion, the conductive plate is provided with a gas hole, and the protruding portion surrounds the gas hole; and wherein the insulating cover comprises a covering portion disposed above the conductive plate, the covering portion covers the protruding portion, a gas flow channel is formed between the protruding portion and the covering portion, and the gas hole communicates with outside of the top cover plate via the gas flow channel, the insulating cover comprises a body and an obstructing portion protruding from an edge of an outer contour of the body toward the conductive plate; the covering portion is provided on the body, and the obstructing portion surrounds the covering portion; the insulating cover further comprises a protrusion extending from the body toward the conductive plate, the protrusion comprises a surrounding portion which surrounds the covering portion, space is formed between the surrounding portion and the covering portion, and a surface of the surrounding portion close to the conductive plate is located on a same plane as a surface of the covering portion close to the conductive plate. a top cover plate; an electrode terminal (204, 206) disposed on the top cover plate; an insulating cover; and a short-circuit component comprising a deformable plate and a conductive plate disposed above the deformable plate, wherein the deformable plate is connected to the top cover plate, and the conductive plate is connected to the electrode terminal (204, 206); wherein the conductive plate comprises a body portion and a protruding portion protruding upwardly from the body portion, the conductive plate is provided with a gas hole, and the protruding portion surrounds the gas hole; and wherein the insulating cover comprises a covering portion disposed above the conductive plate, the covering portion covers the protruding portion, a gas flow channel is formed between the protruding portion and the covering portion, and the gas hole communicates with outside of the top cover plate via the gas flow channel, the insulating cover comprises a body and an obstructing portion protruding from an edge of an outer contour of the body toward the conductive plate; the covering portion is provided on the body, and the obstructing portion surrounds the covering portion; the insulating cover further comprises a protrusion extending from the body toward the conductive plate, the protrusion comprises a surrounding portion which surrounds the covering portion, space is formed between the surrounding portion and the covering portion, and a surface of the surrounding portion close to the conductive plate is located on a same plane as a surface of the covering portion close to the conductive plate.