Secondary battery and manufacturing method thereof

摘要

There are a secondary battery having a pouch-type outer casing and a manufacturing method thereof. In one embodiment, a secondary battery includes an electrode assembly and an outer casing. The electrode assembly has positive and negative electrode plates, a separator interposed therebetween, and positive and negative electrode tabs having one ends respectively connected to the positive and negative electrode plates. The outer casing accommodates the electrode assembly so that the other ends of the positive and negative electrode tabs are extracted from a first side to the exterior thereof. The outer casing has a sealing portion sealed at least twice. The sealing portion is primarily sealed to be fractured under a predetermined internal pressure of the outer casing. After the aging of a battery, the sealing portion is fractured under the predetermined internal pressure, thereby exhausting internal gas. After the exhaustion of the internal gas, the sealing portion is secondarily sealed.

主权项

1. A secondary battery housing dimensioned to receive an electrode assembly having a positive plate, a negative electrode plate, a separator interposed therebetween and positive and negative electrode tabs having one ends respectively connected to the positive and negative electrode plates, the housing comprising:
an electrode assembly having a positive electrode plate, a negative electrode plate, a separator interposed therebetween, and positive and negative electrode tabs having one ends respectively connected to the positive and negative electrode plates; and an outer casing having an interior space that is dimensioned to accommodate the electrode assembly so that the other ends of the positive and negative electrode tabs are extracted from a first side to the exterior thereof, the outer casing having a gas passage at a second side, wherein the gas passage comprises: an inlet portion that is coupled to the interior space of the outer casing via a primary sealing portion wherein the inlet portion extends in a first direction towards the outer perimeter of the outer casing; an outlet portion that is coupled to a space exterior of the outer casing via a secondary sealing portion wherein the outlet portion extends in a first direction towards the outer perimeter of the outer casing; a path portion between the inlet portion and the outlet portion wherein the path portion has a first and a second end and extends in a second direction that intersects the first direction and is parallel to the outer perimeter of the outer casing and wherein the inlet portion intersects the path portion adjacent a first end of the path portion and wherein the outlet portion intersects the path portion adjacent a second end of the path portion and the inlet, outlet and path portions are arranged so that a path defined by the path portion from the interior space of outer casing to the exterior space of the outer casing must include the path portion; wherein the inlet portion and the outlet portion are dimensioned so as to receive the primary sealing portion formed by sealing a portion of the gas passage; and the secondary sealing portion formed by sealing the entire gas passage.