Device and Method for Manufacturing Secondary Battery

A method for manufacturing a secondary battery, the method comprising:

• transferring the secondary battery in a transfer process, wherein the secondary battery comprises an electrode assembly and a pouch accommodating the electrode assembly;
• disposing a pair of sealing blocks facing opposing sides, respectively, of a sealing part of the pouch of the secondary battery in a disposing process;
• preheating a surface of opposing sides of the sealing part of the pouch to a first preheat temperature and a surface of each of the pair of sealing blocks to a second preheat temperature in a preheating process, by using a preheating member;
• and
• heating the pair of sealing blocks to a sealing temperature and then compressing and sealing the sealing part of the pouch with the pair of sealing blocks in a sealing process,
• wherein the preheating process comprises:
• preheating the surface of the opposing sides of the sealing part to the first preheat temperature by a first heating body of the preheating member, and
• preheating the surface of each of the pair of sealing blocks to the second preheat temperature by a second heating body of the preheating member.