The invention belongs to the field of lithium ion batteries, and discloses a lithium ion battery capable of conducting heat from the inside to dissipate heat. The lithium ion battery comprises a battery body formed by winding a positive electrode sheet, a negative electrode sheet and a separator between the positive electrode sheet and the negative electrode sheet, wherein the battery body is internally provided with an insulated heat conduction core shaft, and the battery body is externally provided with a heat dissipation fin, and the heat conduction core shaft and the heat dissipation fin are connected with each other on the end face of the battery body through a heat conduction metal member. The invention integrates the heat dissipation device on the battery, and fully utilizes the structure of the battery to control the temperature of the battery; Heat conduction from the inside of the battery can control the internal temperature of the single battery, the temperature difference of the same battery is small, which is conducive to enhance the safety of lithium batteries and prolong their service life.