Apparatus and method for preparing slurry for secondary battery

A method for preparing slurry for a secondary battery, the method comprising:

• injecting powder for preparing the slurry, which is used for manufacturing the secondary battery, into a mixer for preparing the slurry;
• measuring a torque value applied to the mixer after injecting a solvent into the mixer and collecting a plurality of torque values;
• calculating a kneading point that is a mixing ratio of the powder and the solvent, which are used for preparing the slurry, by using the plurality of torque values collected;
• storing a maximum torque value of the plurality of torque values, wherein the storing is performed between the collecting the plurality of torque values and the calculation of the kneading point;
• and
• additionally injecting the solvent into the mixer until the mixing ratio reaches the kneading point;
• wherein, the kneading point is a mixing ratio of the powder and the solvent when the torque value applied to the mixer reaches a torque value corresponding to a predetermined ratio of the maximum torque value,
• wherein the collecting the plurality of torque values comprises:
• injecting the solvent into the mixer;
• and
• measuring the torque value applied to the mixer,
• wherein the injecting solvent and the measuring the torque value are alternately performed to measure the plurality of torque values applied to the mixer, and
• wherein the predetermined ratio ranges from 30% to 50%.