A method of printing information on a surface of a battery cell using a heat transfer machine, the method comprising: unwinding a heat transfer film having an adhesion layer for indicating the information stacked on a release paper from a heat transfer roller, on which the heat transfer film is wound; locating the heat transfer film on one major surface of the battery cell; the battery cell being configured to have a structure in which an electrode assembly impregnated with an electrolyte and having a cathode, an anode, and a separator disposed between the cathode and the anode is mounted in a pouch-shaped case made of a laminate sheet; applying heat and pressure to the heat transfer film to attach the adhesion layer of the heat transfer film to one major surface of the battery cell; and winding the release paper of the heat transfer film on a release paper roller, and wherein the heat transfer machine is configured to have a structure comprising: the heat transfer roller, on which the heat transfer film is wound; a heat stamp for applying heat and pressure to the heat transfer film unwound from the heat transfer roller on the battery cell; the release paper roller, on which the release paper is wound after heat is transferred to the battery cell; and a battery cell feeder for feeding a plurality of battery cells such that heat is sequentially transferred to the battery cells, wherein the heat stamp performs heat transfer at a temperature of 30 to 60 °C, wherein the heat stamp applies a pressure of 0.5 to 1.5 bar to the heat transfer film and the battery cell. unwinding a heat transfer film having an adhesion layer for indicating the information stacked on a release paper from a heat transfer roller, on which the heat transfer film is wound; locating the heat transfer film on one major surface of the battery cell; the battery cell being configured to have a structure in which an electrode assembly impregnated with an electrolyte and having a cathode, an anode, and a separator disposed between the cathode and the anode is mounted in a pouch-shaped case made of a laminate sheet; applying heat and pressure to the heat transfer film to attach the adhesion layer of the heat transfer film to one major surface of the battery cell; and winding the release paper of the heat transfer film on a release paper roller, and wherein the heat transfer machine is configured to have a structure comprising: the heat transfer roller, on which the heat transfer film is wound; a heat stamp for applying heat and pressure to the heat transfer film unwound from the heat transfer roller on the battery cell; the release paper roller, on which the release paper is wound after heat is transferred to the battery cell; and a battery cell feeder for feeding a plurality of battery cells such that heat is sequentially transferred to the battery cells, wherein the heat stamp performs heat transfer at a temperature of 30 to 60 °C, wherein the heat stamp applies a pressure of 0.5 to 1.5 bar to the heat transfer film and the battery cell. the heat transfer roller, on which the heat transfer film is wound; a heat stamp for applying heat and pressure to the heat transfer film unwound from the heat transfer roller on the battery cell; the release paper roller, on which the release paper is wound after heat is transferred to the battery cell; and a battery cell feeder for feeding a plurality of battery cells such that heat is sequentially transferred to the battery cells,