Sealing apparatus for secondary battery

A sealing apparatus for a secondary battery, the sealing apparatus configured to seal a battery case of the secondary battery with an electrode assembly therein, the sealing apparatus comprising:

• a pair of sealing blocks configured to simultaneously press an entirety of an outer circumferential surface of the battery case;
• and
• a heating unit provided in the pair of sealing blocks, the heating unit being configured to heat the pair of sealing blocks,
• wherein the pair of sealing blocks comprise:
• lead sealing regions configured to press a lead sealing portion of the outer circumferential surface of the battery case in which an electrode lead connected to the electrode assembly extends to an outside of the battery case;
• and
• case sealing regions configured to press a case sealing portion of the outer circumferential surface of the battery case which is a remainder of the battery case outside of the lead sealing portion that does not have the electrode lead extending therethrough,
• wherein the case sealing regions include a first portion adjacent to a first side of the lead sealing regions and a second portion adjacent to a second side of the lead sealing regions, the first portion having a larger surface area than the second portion,
• wherein the heating unit is configured to heat the lead sealing regions and the case sealing regions of the pair of sealing blocks at different temperatures.