A secondary battery top cover assembly , characterized in comprising: a top cover plate ; an electrode terminal 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 ; 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 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 ; 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 . <EOS>