Lithium ion secondary battery with high safety performance

The invention discloses a lithium ion secondary battery with high safety performance. The lithium ion secondary battery comprises a battery shell, the outer surface of the battery shell is coated with an insulating protective adhesive tape; a pole group protection sleeve is arranged in the battery shell; a pole group is arranged in the pole group protection sleeve; a positive tab and a negative tab are arranged at the top of the pole group; an upper bracket covers the top of the pole group; left and right ends of the upper support are provided with an anode through hole and a cathode through hole; a battery cover and an outer gasket are arranged right above the upper bracket from bottom to top; a positive pole and a negative pole are arranged at left and right ends of the battery cover; a positive lug of the pole group upwards penetrates through the positive through hole and then is connected with the lower end of the positive pole; a negative lug of the pole group upwards penetrates through the negative pole