Pouch type secondary battery

A pouch type secondary battery comprising:

• an electrode assembly in which a positive electrode and a negative electrode and a separator are alternately laminated;
• a battery case accommodating the electrode assembly in an inside thereof;
• an electrode tab connected to the electrode assembly and protruding from one side of the electrode assembly;
• a first electrode lead having an inner end electrically connected to the electrode tab;
• a second electrode lead having an inner end mechanically and electrically coupled to an outer end of the first electrode lead and an outer end extending from the inside to an outside of the battery case in a first direction;
• a connection part mechanically and electrically coupling a first part of a first surface of the first electrode lead and a first surface of the second electrode lead to each other;
• an insulation part fused around a first portion of each of the first and second electrode leads, the insulation part bonding the first portion of each of the first and second electrode leads to the battery case;
• and
• a fusion prevention part located at a second portion of the first electrode lead, the second portion being a second part of the first surface of first electrode lead that does not extend between the first and second electrode leads, the fusion prevention part preventing the second portion of the first electrode lead from being fused to the insulation part,
• wherein the fusion prevention part is entirely disposed within the insulation part,
• wherein the fusion prevention part has a length of 1-4 mm extending in the first direction, the fusion prevention part being configured to reduce an adhesion area between the first electrode lead and the insulation part, thereby decreasing a minimum internal pressure of the battery case at which the first and second electrode leads detach from each other.